Add-drop ring resonator system is the fundamental building block of the optical transmission and communication systems. The microring resonator (MRR) made of semiconductor with a length of 750 μm, K1=k2= 0.02, is used to filter the input spectrum of Gaussian laser beam and generate the comb frequency of soliton pulses, where the transmission characteristics and group delay profile of the through and drop port output signals are presented. The semiconductor material (InGaAsP/InP) is used to generate the add-drop ring resonator. The operating wavelength is 1550 nm andthe iterative method is used to generate the results based on practical parameters of the system.
Chaotic soliton can be generated using a nonlinear PANDA system. The research uses microring resonator
(MRR) to generate and trap chaotic signals along fiber optic communication. The parameters such as refractive
indices of a silicon waveguide, coupling coefficients ( ), coupling loss, radius of the ring (R) and the input power can be selected properly to operate the nonlinear behavior. The input Gaussian laser pulses with power of 0.45 W are inserted into the system. The central wavelength of the input power has been selected to λ0=1.55 µm where the nonlinear refractive index of the medium is n2=1.3×10−17 m2 W−1
. The generated chaotic signals with Full at Half
Maximum of 24 pm can be transmitted along the fiber optic with length of 195 km. The trapping of chaotic signals can be obtained at the end of the transmission link. Here signals with 600 fm bandwidth could be trapped within the system.
Generation of Quantum Photon Information Using Extremely Narrow Optical Tweez...University of Malaya (UM)
A system of microring resonator (MRR) is presented to generate extremely narrow optical tweezers. An add/drop filter system consisting of one centered ring and one smaller ring on the left side can be used to generate extremely narrow pulse of optical tweezers. Optical tweezers generated by the dark-Gaussian behavior propagate via the MRRs system, where the input Gaussian pulse controls the output signal at the drop port of the system. Here the output optical tweezers can be connected to a quantum signal processing system (receiver), where it can be used to generate high capacity quantum codes within series of MRR’s and an add/drop filter. Detection of the encoded signals known as quantum bits can be done by the receiver unit system. Generated entangled photon pair propagates via an optical communication link. Here, the result of optical tweezers with full width at half maximum (FWHM) of 0.3 nm, 0.8 nm and 1.6 nm, 1.3 nm are obtained at the through and drop ports of the system respectively. These results used to be transmitted through a quantum signal processor via an optical computer network communication link.
This is a fiber optic cable testing device that injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered The strength of the return pulses is measured and integrated as a function of time, and plotted as a function of fiber length. which is called TRACE
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR is the optical equivalent of an electronic time domain reflectometer. It injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered (Rayleigh backscatter) or reflected back from points along the fiber. The scattered or reflected light that is gathered back is used to characterize the optical fiber. This is equivalent to the way that an electronic time-domain meter measures reflections caused by changes in the impedance of the cable under test. The strength of the return pulses is measured and integrated as a function of time, and plotted as a function of fiber length.
Chaotic soliton can be generated using a nonlinear PANDA system. The research uses microring resonator
(MRR) to generate and trap chaotic signals along fiber optic communication. The parameters such as refractive
indices of a silicon waveguide, coupling coefficients ( ), coupling loss, radius of the ring (R) and the input power can be selected properly to operate the nonlinear behavior. The input Gaussian laser pulses with power of 0.45 W are inserted into the system. The central wavelength of the input power has been selected to λ0=1.55 µm where the nonlinear refractive index of the medium is n2=1.3×10−17 m2 W−1
. The generated chaotic signals with Full at Half
Maximum of 24 pm can be transmitted along the fiber optic with length of 195 km. The trapping of chaotic signals can be obtained at the end of the transmission link. Here signals with 600 fm bandwidth could be trapped within the system.
Generation of Quantum Photon Information Using Extremely Narrow Optical Tweez...University of Malaya (UM)
A system of microring resonator (MRR) is presented to generate extremely narrow optical tweezers. An add/drop filter system consisting of one centered ring and one smaller ring on the left side can be used to generate extremely narrow pulse of optical tweezers. Optical tweezers generated by the dark-Gaussian behavior propagate via the MRRs system, where the input Gaussian pulse controls the output signal at the drop port of the system. Here the output optical tweezers can be connected to a quantum signal processing system (receiver), where it can be used to generate high capacity quantum codes within series of MRR’s and an add/drop filter. Detection of the encoded signals known as quantum bits can be done by the receiver unit system. Generated entangled photon pair propagates via an optical communication link. Here, the result of optical tweezers with full width at half maximum (FWHM) of 0.3 nm, 0.8 nm and 1.6 nm, 1.3 nm are obtained at the through and drop ports of the system respectively. These results used to be transmitted through a quantum signal processor via an optical computer network communication link.
This is a fiber optic cable testing device that injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered The strength of the return pulses is measured and integrated as a function of time, and plotted as a function of fiber length. which is called TRACE
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR is the optical equivalent of an electronic time domain reflectometer. It injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered (Rayleigh backscatter) or reflected back from points along the fiber. The scattered or reflected light that is gathered back is used to characterize the optical fiber. This is equivalent to the way that an electronic time-domain meter measures reflections caused by changes in the impedance of the cable under test. The strength of the return pulses is measured and integrated as a function of time, and plotted as a function of fiber length.
An Optical Time Domain Reflectometer (OTDR) is an important instrument used by organizations to certify the performance of new fiber optics links and detect problems with existing fiber links.
Optimum Location of EDFA based on Eye Diagram, Q-factor and Bit Error Rate Me...IOSRJECE
This work investigated the optimum location of Erbium Doped Fiber Amplifier (EDFA) in an optical system based on analysis of BER analyzer metrics by simulation approach using Optisystem software. The simulation model will be studied based on many parameters as input power (dBm), gain of Amplifier (dBm), fiber cable length (km) and attenuation coefficient (dB/km), there are two different parameters will be analyzed at five different locations of EDFA which are Q-Factor and Bit Error Rate (BER) and also Eye Diagram, which Q-factor and BER are measurement parameters used to measure the quality of received signal at receiver.
Performance of DCO-OFDM in Optical Wireless Communication SystemAM Publications
OFDM scheme is widely adopted as it has high data rate and good performance under various channel conditions. In this paper, a number of unipolar optical OFDM scheme has been used for IM/DD system using simulink. To develop such a complex system, this paper proposes MATLAB as the platform for its implementation. The modeling of block diagram is done using Fast Fourier Transform and Hermitian symmetry. The concept of Optical OFDM uses LED at the transmitter and Photodiode at the receiver to demonstrate the optical characteristics of the system. The model has been implemented using different modulation techniques and under various channels. The paper suggests that using QPSK modulation in white Gaussian noise with 5dB SNR gives best result in terms of BER. Similarly, DBPSK modulation technique performs better with the increase in fading frequency. Thus, the complete model description suggests novelty in the modulation schemes that can be accepted for channels applicable in optical OFDM communication.
Characterization Of Switchable And Multilayered FSS Circuits Using The WCIP M...IJERA Editor
In this paper, we use the Wave Concept Iterative Procedure (WCIP) to study the Switchable and multilayered
FSS (Frequency Selective Surface) circuits. The Switchable part is used for the adjustment of the frequency of
the HF Electronics Circuits. This adjustment is applied by the integration of RF-MEMS switches. This system is
based on the use of circuit fabrication processes included. In order to initialize the iterative procedure, an
incident wave is defined in the spectral domain
IOSR Journal of Applied Physics (IOSR-JAP) is an open access international journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
OTDR(OPTICAL TIME DOMAIN REFLECTOMETER)Shail Mishra
OTDR, OPTICAL TIME DOMAIN REFLECTOMETER, How to calculate link budget, Basic of Wavelength, FTTH Network, Working Principle of OTDR, OTDR BASIC PARAMETER.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Novel method to find the parameter for noise removal from multi channel ecg w...eSAT Journals
Abstract In general, electrocardiogram (ECG) waveforms are affected by noise and artifacts and it is essential to remove the noise in order to support any decision making for specialist. It is very difficult to remove the noise from 12 channel ECG waveforms using standard noise removal methodologies. Removal of the noise from ECG waveforms is majorly classified into two types in signal processing namely Digital filters and Analog filters. Digital filters are more accurate than analog filters because analog filters introduce nonlinear phase shift. Most advanced research digital filters are FIR and IIR.FIR filters are stable as they have non-recursive structure. They give the exact linear phase and efficiently realizable in hardware. The filter response is finite duration. Thus noise removal using FIR digital filter is better option in comparison with IIR digital filter. But it is very difficult to find the cut-off frequency parameter for dynamic multi-channel ECG waveforms using existing traditional methods. So, in this research, newly introduced Multi-Swarm Optimization (MSO) methodology for automatically identifying the cut-off frequency parameter of multichannel ECG waveforms for low-pass filtering is inspecting. Generally, the spectrums of the ECG waveforms are extracted from four classes: normal sinus rhythm, atria fibrillation, arrhythmia and supraventricular. Baseline wander is removed using the Moving Median Filter. A dataset of the extracted features of the ECG spectrums is used to train the MSO. The performance of the MSO with various parameters is investigated. Finally, the MSO-identified cut-off frequency parameter, it’s applied to a Finite Impulse Response (FIR) filter. The resulting signal is evaluated against the original clean and conventional filtered ECG signal. Keywords: 12 Channel ECG Waveforms, Multi Swarm Optimization Neural Network, Low-pass filtering, Finite Impulse Response (FIR).
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Generation of Nanometer Optical Tweezers Used for Optical Communication Netw...University of Malaya (UM)
A system of Half-Panda microring resonator (MRR) is proposed to generate ultra-short nanometer (nm)
optical tweezers. The dark soliton propagates inside nonlinear MRR. Molecules or photons transport within the system when the dark soliton is used as input pulse. Nano optical tweezers can be generated and used to many applications in optical communication networks. Here the smallest nano optical tweezers signals with full width at half maximum (FWHM) of 9 nm is obtained where the free spectrum range (FSR) of 50 nm is simulated.
Second or fourth-order finite difference operators, which one is most effective?Premier Publishers
This paper presents higher-order finite difference (FD) formulas for the spatial approximation of the time-dependent reaction-diffusion problems with a clear justification through examples, “why fourth-order FD formula is preferred to its second-order counterpart” that has been widely used in literature. As a consequence, methods for the solution of initial and boundary value PDEs, such as the method of lines (MOL), is of broad interest in science and engineering. This procedure begins with discretizing the spatial derivatives in the PDE with algebraic approximations. The key idea of MOL is to replace the spatial derivatives in the PDE with the algebraic approximations. Once this procedure is done, the spatial derivatives are no longer stated explicitly in terms of the spatial independent variables. In other words, only one independent variable is remaining, the resulting semi-discrete problem has now become a system of coupled ordinary differential equations (ODEs) in time. Thus, we can apply any integration algorithm for the initial value ODEs to compute an approximate numerical solution to the PDE. Analysis of the basic properties of these schemes such as the order of accuracy, convergence, consistency, stability and symmetry are well examined.
The experiment was done to assess incidence and severity; variations in Colletotrichum kahawae isolates and resistance levels in Hararghe coffee. Assessment was conducted in Bedeno, Boke, Habro and Darolebu districts August to September 2010. Incidence and severity were recorded on 50 and 10 randomly selected coffee trees/ farm respectively. Pathogenic variability was studied by cultural and morphological characteristics, and placed into 4 based on colony color. Reactions of 11 landraces and checks were evaluated through hypocotyl inoculation. Mean disease incidence was 51 % at Darolebu and 75 % at Bedeno, and mean disease severity 26 % at Boke and 50 % at Bedeno. Mean radial colony growth of isolates was between 4.05 and 5.35 millimeter/24 hour on malt extract agar and potato dextrose agar, respectively. Conidia width and length ranged from 2.12-4.24 and 10.51-15.78 μm, respectively. Significant (P < 0.05) variation was observed among isolates in sporulation capacity. Highly significant variations (P < 0.0001) was observed among selections H-05/02, H-568/02, H-87/02 and the resistant check in percent mean incidence and percent mean severity, and were classified as moderately susceptible indicating presence of resistance sources. Hence, important to conserve and conduct intensive selection from more diverse populations.
We present a new BVR light curves of the system EQ Tau carried out in the period from March to April 2006 using a 50-cm F/8.4 Ritchey–Chretien telescope (Ba50) of the Baja Astronomical Observatory (Hungary), and 512 × 512 Apogee AP-7 CCD camera. The observed light curves were analyzed using the 2004 version of the Wilson-Devinney code. The results show that the more massive component is hotter than the low massive one by 100 K. A long term orbital period study shows that the period increases by the rate 8.946 (±0.365) x10-11 days/cycle. Evolutionary state of the system has been investigated and showed that, the primary component of the system is located nearly on the ZAMS for both the M-L and M-R relations. The secondary component is close to the TAMS track for M-L and above the M-R relations.
Distribution assessment and pathogenicity test of coffee berry disease (Colle...Premier Publishers
Coffee berry disease causes about 30 % national average crop losses every year in Ethiopia. This study was conducted to assess the distribution of coffee berry disease and test to know the pathogenicity of the disease on coffee landraces. Assessment of the disease was conducted in Bedeno, Boke, Habro and Darolebu districts from August to September 2011. Incidence and severity were recorded on 50 and 10 randomly selected coffee trees per farm; respectively. This disease was prevalent in all surveyed districts of Hararghe. The mean disease incidence was 51 % at Darolebu and 75 % at Bedeno and the mean disease severity was 26 % at Boke and 50 % at Bedeno. There was a highly significant difference among cultivar * isolate interactions. This indicated the presence of resistance sources in Hararghe coffee germplasms that may be exploited for coffee improvement purpose. Hence, it is important to conserve both in situ and ex situ and use sustainably the Hararghe coffee germplasms by conducting intensive selection from more diverse coffee populations and evaluations for resistance to coffee berry disease.
An Optical Time Domain Reflectometer (OTDR) is an important instrument used by organizations to certify the performance of new fiber optics links and detect problems with existing fiber links.
Optimum Location of EDFA based on Eye Diagram, Q-factor and Bit Error Rate Me...IOSRJECE
This work investigated the optimum location of Erbium Doped Fiber Amplifier (EDFA) in an optical system based on analysis of BER analyzer metrics by simulation approach using Optisystem software. The simulation model will be studied based on many parameters as input power (dBm), gain of Amplifier (dBm), fiber cable length (km) and attenuation coefficient (dB/km), there are two different parameters will be analyzed at five different locations of EDFA which are Q-Factor and Bit Error Rate (BER) and also Eye Diagram, which Q-factor and BER are measurement parameters used to measure the quality of received signal at receiver.
Performance of DCO-OFDM in Optical Wireless Communication SystemAM Publications
OFDM scheme is widely adopted as it has high data rate and good performance under various channel conditions. In this paper, a number of unipolar optical OFDM scheme has been used for IM/DD system using simulink. To develop such a complex system, this paper proposes MATLAB as the platform for its implementation. The modeling of block diagram is done using Fast Fourier Transform and Hermitian symmetry. The concept of Optical OFDM uses LED at the transmitter and Photodiode at the receiver to demonstrate the optical characteristics of the system. The model has been implemented using different modulation techniques and under various channels. The paper suggests that using QPSK modulation in white Gaussian noise with 5dB SNR gives best result in terms of BER. Similarly, DBPSK modulation technique performs better with the increase in fading frequency. Thus, the complete model description suggests novelty in the modulation schemes that can be accepted for channels applicable in optical OFDM communication.
Characterization Of Switchable And Multilayered FSS Circuits Using The WCIP M...IJERA Editor
In this paper, we use the Wave Concept Iterative Procedure (WCIP) to study the Switchable and multilayered
FSS (Frequency Selective Surface) circuits. The Switchable part is used for the adjustment of the frequency of
the HF Electronics Circuits. This adjustment is applied by the integration of RF-MEMS switches. This system is
based on the use of circuit fabrication processes included. In order to initialize the iterative procedure, an
incident wave is defined in the spectral domain
IOSR Journal of Applied Physics (IOSR-JAP) is an open access international journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
OTDR(OPTICAL TIME DOMAIN REFLECTOMETER)Shail Mishra
OTDR, OPTICAL TIME DOMAIN REFLECTOMETER, How to calculate link budget, Basic of Wavelength, FTTH Network, Working Principle of OTDR, OTDR BASIC PARAMETER.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Novel method to find the parameter for noise removal from multi channel ecg w...eSAT Journals
Abstract In general, electrocardiogram (ECG) waveforms are affected by noise and artifacts and it is essential to remove the noise in order to support any decision making for specialist. It is very difficult to remove the noise from 12 channel ECG waveforms using standard noise removal methodologies. Removal of the noise from ECG waveforms is majorly classified into two types in signal processing namely Digital filters and Analog filters. Digital filters are more accurate than analog filters because analog filters introduce nonlinear phase shift. Most advanced research digital filters are FIR and IIR.FIR filters are stable as they have non-recursive structure. They give the exact linear phase and efficiently realizable in hardware. The filter response is finite duration. Thus noise removal using FIR digital filter is better option in comparison with IIR digital filter. But it is very difficult to find the cut-off frequency parameter for dynamic multi-channel ECG waveforms using existing traditional methods. So, in this research, newly introduced Multi-Swarm Optimization (MSO) methodology for automatically identifying the cut-off frequency parameter of multichannel ECG waveforms for low-pass filtering is inspecting. Generally, the spectrums of the ECG waveforms are extracted from four classes: normal sinus rhythm, atria fibrillation, arrhythmia and supraventricular. Baseline wander is removed using the Moving Median Filter. A dataset of the extracted features of the ECG spectrums is used to train the MSO. The performance of the MSO with various parameters is investigated. Finally, the MSO-identified cut-off frequency parameter, it’s applied to a Finite Impulse Response (FIR) filter. The resulting signal is evaluated against the original clean and conventional filtered ECG signal. Keywords: 12 Channel ECG Waveforms, Multi Swarm Optimization Neural Network, Low-pass filtering, Finite Impulse Response (FIR).
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Generation of Nanometer Optical Tweezers Used for Optical Communication Netw...University of Malaya (UM)
A system of Half-Panda microring resonator (MRR) is proposed to generate ultra-short nanometer (nm)
optical tweezers. The dark soliton propagates inside nonlinear MRR. Molecules or photons transport within the system when the dark soliton is used as input pulse. Nano optical tweezers can be generated and used to many applications in optical communication networks. Here the smallest nano optical tweezers signals with full width at half maximum (FWHM) of 9 nm is obtained where the free spectrum range (FSR) of 50 nm is simulated.
Second or fourth-order finite difference operators, which one is most effective?Premier Publishers
This paper presents higher-order finite difference (FD) formulas for the spatial approximation of the time-dependent reaction-diffusion problems with a clear justification through examples, “why fourth-order FD formula is preferred to its second-order counterpart” that has been widely used in literature. As a consequence, methods for the solution of initial and boundary value PDEs, such as the method of lines (MOL), is of broad interest in science and engineering. This procedure begins with discretizing the spatial derivatives in the PDE with algebraic approximations. The key idea of MOL is to replace the spatial derivatives in the PDE with the algebraic approximations. Once this procedure is done, the spatial derivatives are no longer stated explicitly in terms of the spatial independent variables. In other words, only one independent variable is remaining, the resulting semi-discrete problem has now become a system of coupled ordinary differential equations (ODEs) in time. Thus, we can apply any integration algorithm for the initial value ODEs to compute an approximate numerical solution to the PDE. Analysis of the basic properties of these schemes such as the order of accuracy, convergence, consistency, stability and symmetry are well examined.
The experiment was done to assess incidence and severity; variations in Colletotrichum kahawae isolates and resistance levels in Hararghe coffee. Assessment was conducted in Bedeno, Boke, Habro and Darolebu districts August to September 2010. Incidence and severity were recorded on 50 and 10 randomly selected coffee trees/ farm respectively. Pathogenic variability was studied by cultural and morphological characteristics, and placed into 4 based on colony color. Reactions of 11 landraces and checks were evaluated through hypocotyl inoculation. Mean disease incidence was 51 % at Darolebu and 75 % at Bedeno, and mean disease severity 26 % at Boke and 50 % at Bedeno. Mean radial colony growth of isolates was between 4.05 and 5.35 millimeter/24 hour on malt extract agar and potato dextrose agar, respectively. Conidia width and length ranged from 2.12-4.24 and 10.51-15.78 μm, respectively. Significant (P < 0.05) variation was observed among isolates in sporulation capacity. Highly significant variations (P < 0.0001) was observed among selections H-05/02, H-568/02, H-87/02 and the resistant check in percent mean incidence and percent mean severity, and were classified as moderately susceptible indicating presence of resistance sources. Hence, important to conserve and conduct intensive selection from more diverse populations.
We present a new BVR light curves of the system EQ Tau carried out in the period from March to April 2006 using a 50-cm F/8.4 Ritchey–Chretien telescope (Ba50) of the Baja Astronomical Observatory (Hungary), and 512 × 512 Apogee AP-7 CCD camera. The observed light curves were analyzed using the 2004 version of the Wilson-Devinney code. The results show that the more massive component is hotter than the low massive one by 100 K. A long term orbital period study shows that the period increases by the rate 8.946 (±0.365) x10-11 days/cycle. Evolutionary state of the system has been investigated and showed that, the primary component of the system is located nearly on the ZAMS for both the M-L and M-R relations. The secondary component is close to the TAMS track for M-L and above the M-R relations.
Distribution assessment and pathogenicity test of coffee berry disease (Colle...Premier Publishers
Coffee berry disease causes about 30 % national average crop losses every year in Ethiopia. This study was conducted to assess the distribution of coffee berry disease and test to know the pathogenicity of the disease on coffee landraces. Assessment of the disease was conducted in Bedeno, Boke, Habro and Darolebu districts from August to September 2011. Incidence and severity were recorded on 50 and 10 randomly selected coffee trees per farm; respectively. This disease was prevalent in all surveyed districts of Hararghe. The mean disease incidence was 51 % at Darolebu and 75 % at Bedeno and the mean disease severity was 26 % at Boke and 50 % at Bedeno. There was a highly significant difference among cultivar * isolate interactions. This indicated the presence of resistance sources in Hararghe coffee germplasms that may be exploited for coffee improvement purpose. Hence, it is important to conserve both in situ and ex situ and use sustainably the Hararghe coffee germplasms by conducting intensive selection from more diverse coffee populations and evaluations for resistance to coffee berry disease.
Problems faced by farmers in application of e-Agriculture in BangladeshPremier Publishers
The purpose of this research was to identify the obstacles that Bangladeshi farmers encountered while using e-Agriculture services. Primary data were collected in Bhatbour Block of Dhighi union under Sadar Upazila of Minikganj District where the local government had been implementing the e-Agriculture pilot project since 2011. Data were collected from 1 September, 2015 to 30 September, 2015. Descriptive statistics, multiple regression (B) method were used for analysis. Findings discovered that lack of knowledge on e-Agriculture was the major problem that affected the farmers in the study area. In addition to that, the study also revealed that education, participation in training, usages of e-Agriculture, attitude towards e-Agriculture and availability of e-Agriculture had significant contribution towards the problems faced by farmers’ in using e-Agriculture. These variables accounted for 65.8 percent of the problems faced by farmers’ in using e-Agriculture. Based on these findings, the researchers suggest that government should implement integrated marketing communication using the popular print and electronic media so that awareness about the service will reach majority of the population more and more people get aware of this service. In addition to that, the researchers recommend that the NGO’s and local government bodies should create awareness to the farmers via organization of local seminars and training programs on availability and usefulness of e-Agriculture service.
The role of middlemen in fresh tomato supply chain in Kilolo district, Tanzania Premier Publishers
The paper aimed to analyze the role of middlemen in linking smallholder tomato farmers with Dar-es-salaam markets, Tanzania. Semi-structured questionnaires were administered to 133 small vegetable farmers and 109 traders. Data analysis was done using descriptive statistics such as frequencies, percentage, chi-square and one way analysis of variance. The study revealed that majority (58%) of smallholder tomato farmers sold their produce to middlemen due to being geographical separated from the markets, poor local road network and poor access to market information. This study concluded that the use of middlemen to sell tomato produce cannot be avoided unless smallholder farmers are linked with urban markets. In order to enhance farmer’s access to markets, it is recommended that the government should strive to improve feeder roads. Improvement in feeder roads is likely to bring about large welfare gains in terms of large volumes of tomatoes traded and can make assembling of tomatoes easier and less costly for traders.
Gamma ray induced early generation polygenic variability in medium grain arom...Premier Publishers
Two advanced breeding lines of aromatic non-basmati rice, IET 14142 and IET 14143, irradiated with 250Gy, 350Gy and 450Gy of gamma ray induced wide variation for polygenic characters in M2 and M3 generations. Wide range of genotypic and phenotypic coefficients of variation (GCV and PCV) for different characters indicated differential radio-sensitivity of the characters. Increase in values of GCV and PCV in M3 over M2 generation for flag leaf length and spikelet number was due to “release of additional variability”. Heritability in M3 generation increased over M2 in IET 14142 for days to flower and flag leaf angle at all three doses, and for other characters only at certain doses. The genetic advance increased from M2 to M3 in IET 14142 for some characters due to increase in variance, while it decreased in M3 generation in IET 14143 for certain characters due to increase in mean values. The overall results indicated the scope for isolating promising segregants in micro mutational population even in early generations.
An economic analysis of mulberry raw silk production in traditional and non-t...Premier Publishers
Sericulture is cottage based industry which combines both the features of agriculture and industry. India has tremendous potential for silk development but yet unexploited, however development is not far away. The current study is an attempt to analyse the share between traditional and non-traditional states and between the states on the basis of mulberry silk production and mulberry cultivation. Regression analysis, coefficient of variation, growth rate was used to attain the objectives of the study. It was found that the traditional states hold the maximum share both in mulberry cultivation during 2012-13 was (82.90%) as well as production of raw silk (96.49%). In which Karnataka, Andhra Pradesh and West Bengal contributes maximum production among traditional states, while as Maharashtra, Manipur and Madhya Pradesh are the leading contributing states among the non-traditional states in total raw silk production in India.
Some aspects of the oldest nearby moving cluster (Ruprecht 147)Premier Publishers
Based on the membership data retrieved from the Two Micron All Sky Survey (2MASS), we have computed some parameters of the moving open cluster Ruprecht 147, like, vertex, velocity, distance, distance modulus, and center of the cluster. All of these aspects were carried out using an algorithm due to Sharaf et al. (2000), into which error estimates of these parameters will be established in closed analytical forms (e.g. standard and probable errors of the vertex coordinates, angular distance, velocity of the cluster, parallaxes of member stars, and distance of the cluster).
Finally, we compared our results with other published values, which is in good agreement.
Teacher participation in organisational development efforts: the case of seco...Premier Publishers
The study examined the extent of teacher participation in different areas of decision-making in secondary schools in Bulawayo Province of Zimbabwe and the impact of this involvement on school improvement through organisational development. A survey using self-administered questionnaires with a Likert-type scale assessing teachers’ actual and preferred participation in decision-making was employed. The sample comprised 200 teachers and 20 school heads. Of the sample respondents, 78% were female and 22% were male. Data were collected through semi-structured questionnaires. Descriptive statistical analysis was used to interpret data. The study indicated that the actual teacher participation in decisions concerning learners was fairly high, but quite low in respect of managerial decisions. The difference between the actual and the preferred levels of participation showed high levels of deprivation. Greater involvement in issues concerning learners and the lower levels of participation in respect of managerial issues were attributable to such dimensions as failure to adopt new decisions, passive resistance by teachers, bureaucracy and lack of knowledge by heads. The significance of the results of this study lies on the implications for school improvement practice: heads of schools should enhance teacher participation not only in issues relating to pedagogy but managerial issues as well.
Azo dyes are one of the oldest industrially synthesized organic compounds characterized by presence of Azo bond (-N=N-) and are widely utilized as coloring agents in textile, leather, cosmetic, paint, plastic, paper, and food industries During textile processing, inefficiencies in dyeing result in large amounts of the dyestuff (varying from 2% loss when using basic dyes to a 50% loss when certain reactive dyes used) is being directly lost to the wastewater, which ultimately finds its way into the environment. The physico-chemical method of industrial effluent treatment does not remove the dyes effectively. Microbial degradation and decolorization of azo dyes has gained more attention recently because of eco-friendly and inexpensive nature. Microbes and there enzymes could decolorize the dyes by both aerobic and anaerobic metabolis. This review provides a general idea of decolorization and biodegradation of azo dyes with various microbes and highlights the application of for the treatment of azo dye-containing wastewaters.
Ultrasonic attenuation is a very important physical parameter to characterize the material, which is well associated to numerous physical quantities.An effort has been made for obtaining higher order elastic constants of CaO starting from basic parameters viz. nearest neighbor distance, hardness parameter and using Coulomb and Börn-Mayer potentials. These values are utilized to obtain Grüneisen parameters and non-linearity constants. Non-linearity constants ratio, ultrasonic attenuation due to phonon-phonon interaction (a/f2)p-p and thermo elastic loss (a/f2)th are calculated in a wide temperature range along <100>, <110> and <111> crystallographic directions of propagation for longitudinal and shear waves and compared with available theoretical and experimental results. From the attenuation values along different directions; it is evident that the ultrasonic attenuation is different along different directions of propagation and varies with the orientation of the crystal.
Perceptions of teachers towards the student expulsion procedures in Hwange di...Premier Publishers
Schools across all countries have a legal responsibility to protect staff and to provide a safe learning environment for all students. Sometimes the actions of some students threaten the health and safety of staff and other students or create violence, either by the destruction of school property or by possession of illegal weapons and substances or their actions generally disrupt good order and management of the school. This study sought to investigate teachers’ perceptions towards the student expulsion procedures in Zimbabwean secondary schools using the quantitative methodology. The study adopted the descriptive survey design. The target population comprised of all secondary school teachers in Hwange District in Matabeleland North Province. The random sample procedure was used to come up with a total sample of 80 respondents made up of 42 female and 38 male. The research instrument used was the questionnaire. The study revealed that teachers thought that the current student expulsion procedure was very ineffective. The study recommends that expulsion of students should take a shorter period of time in order to deter would-be offenders as well.
Biosystem treatment approach for seaweed processing wastewater Premier Publishers
Wastewater obtained from the seaweed washing process often contains residual chemicals, as the seaweed is typically washed using chemicals. Here, we used a biosystem to treat wastewater obtained after seaweed processing. The research goals were to determine the effectivity and capacity of this biosystem for reducing chemical oxygen demand (COD), biological oxygen demand (BOD), and nitrites in the wastewater. We planted and prepared the biosystem bin, adapted the plants in the biosystem bin until they were ready for use, and we performed wastewater treatment using the biosystem either with or without the addition of an active bacterial suspension. The results show that addition of the active suspension significantly improved effectivity with respect to COD and nitrites (p<0.05). With respect to COD, BOD, and nitrites, the effectivity of the biosystem with an added active suspension was 83.9, 87.2, and 55.5%, respectively; the effectivity of the biosystem without the active suspension was 79.2, 83.3, and 38.7%, respectively. The capacity of the biosystem with an added active suspension was 13.226, 6.805, and 0.014mg/L/m3hour with respect to reducing COD, BOD, and nitrites, respectively; the capacity of the biosystem without an active suspension was 12.485, 6.496, and 0.009 mg/L/m3hour, respectively.
Production of alcohol by yeast isolated from apple, orange and bananaPremier Publishers
The purpose of this study was to isolate wild yeast strains present in different fruits (apple, orange and banana) and to determine the yeast growth and the amount of alcohol production at various glucose concentrations. Three fruits namely apple, banana and orange were selected as natural sources for yeast isolation. Medium used for isolation of yeast from fruits was consisting of 50 glucose, 3 malt extract, 3 yeast extract, 5 peptone and 15g/L agar. For fermentation MGYP medium used with different glucose concentrations of 5, 10, 30, 50 and 70g/L. Inocula were prepared by loop transfers from stock slants to 50 mL of the 20 percent medium in 500-mL Erlenmeyer flasks. The results showed that with higher concentration of glucose (30g/L) higher amount of alcohol (0.22g/100mL) was produced. Similarly, the yeast isolated from apple showed maximum yeast biomass (0.38g/100mL) at 70g/L glucose concentration and minimum on 50g/L (0.03g/100mL) glucose concentration. In conclusion, the wild yeast produce higher ethanol amount in case of banana fruits.
The aim of this study is to generate nano optical tweezers to be connected to an optical quantum signal processing system in order to transmit quantum photon via an optical communication link. A system of microring resonator (MRR) known as Half-Panda is proposed to generate nano optical tweezers. Optical tweezers can be used to transport molecules in a communication link. The dark soliton propagates inside nonlinear MRR. Transportation of molecules or photons is implemented when the dark soliton is used as input pulse. The input Gaussian soliton is used to control the output signal at the through and drop ports of the system. Output nano optical tweezers can be connected to the quantum signal processing system consisting of a receiver and transmitter. The receiver will detect the signals of optical tweezers and transmit them via wired/wireless as quantum bits. The transmitter will generate the entangled photon pair which propagates via an optical communication link. Here the smallest nano optical tweezers signals with width at half maximum (FWHM) of 4.2 nm is obtained where the free spectrum range (FSR) of 50 nm is simulated.
Quantum Transmission of Optical Tweezers Via Fiber Optic Using Half-Panda Sys...University of Malaya (UM)
: The aim of this study is to generate nano optical tweezers to be connected to an optical transmission link in order to transmit tweezers via an optical fiber. A system of microring resonator (MRR) known as Half-Panda is proposed to generate nano optical tweezers. Optical tweezers can be used to transport molecules in a communication link. The dark soliton propagates inside nonlinear MRR. The input bright soliton is used to control the output signal at the through and drop ports of the system. Throughput nano optical tweezers can be connected to the fiber optic with a length of 100 km, where transmission of tweezers can be performed. The optical receiver will detect the signals of optical tweezers. A transmitter system can be used to transmit the tweezers via wired/wireless link to the users in a short communication link. Here the nano optical tweezers signals with width at half maximum (FWHM) of 33 nm are obtained and transmitted, where the free spectrum range (FSR) of the pulses is 50 nm.
Single Soliton Bandwidth Generation and Manipulation by Microring ResonatorUniversity of Malaya (UM)
In this paper, we propose a system for chaotic signal generation using a microring resonator (MRR) fiber optic system. This system uses a regular laserdiode as input power and can be incorporated with an optical add/drop filter system. When light from the laser diode feedbacks to the fiber ring resonator, the actual chaotic signal is produced by using the appropriate fiber ring resonator parameters and also the laser diode input power. The filtering process of the chaotic signals occurs during the round-trip of the pulse within the ring resonators. The single soliton pulses generation and bandwidth manipulation of the pulse can be performed using the add/drop system. Results obtained have established particular possibilities from the application. The obtained results show the effects of coupling coefficients on the bandwidth of the single soliton pulse, where the chaotic behaviors of the input pulses are presented.
Integrated ring resonator system analysis to Optimize the soliton transmissionPremier Publishers
The chaotic signals can be generated within the microring resonator (MRR) system when the Gaussian pulse with input power of 120 mW is inserted into the system. Generation of chaotic signals respect to the ring's radius has been studied. The coupling coefficient affects the output power significantly, thus in order to generate signals with higher output power, the smaller coupling coefficient can be used. Here the output power of the system is characterized with respect to the different coupling coefficients of the system.A series of MRRs connected to an add/drop filter system in order to anaylize the soliton signals. The nonlinear refractive index of the MRR is n2=2.2 x 10-17 m2/W. The capacity of the output signals can be increased through generation of peaks with smaller full width at half maximum (FWHM). Here, we generate and characterize the ultra-short optical soliton pulses respect to the ring's radius and coupling coefficients variation of the system. As result, soliton pulses with FWHM and free spectral range (FSR) of 50 pm and 1440 pm are generated.
Decimal Convertor Application for Optical Wireless Communication by Generatin...University of Malaya (UM)
Two systems consist of microring resonators (MRRs) and an add/drop filter are used to generate signals as localized multi wavelengths. Quantum dense encoding
can be performed by output signals of selected wavelengths incorporated to a polarization control system. Therefore dark and bright optical soliton pulses
with different time slot are generated. They can be converted into digital logic quantum codes using a decimal convertor system propagating along a wireless networks. Results show that multi soliton wavelength, ranged from 1.55 m to 1.56 m with FWHM and FSR of 10 pm and 600 pm can be generated respectively. Keywords- Micro Ring Resonator, Quantum Dense Coding (QDC), Wireless network communication system.
Cryptography Scheme of an Optical Switching System Using Pico/Femto Second So...University of Malaya (UM)
We propose a system of microring resonators (MRRs) incorporating with an add/drop filter system. Optical soliton can be simulated and used to generate entangled photon, applicable in single and multiple optical switching. Chaotic signals can be generated via the MRRs system. Therefore continuous spatial and temporal signals are generated spreading over the spectrum. Polarized photons are formed incorporating the
polarization control unit into the MRRs, which allows different time slot entangled photons to be randomly formed. Results show the single soliton pulse of 0.7 ps where the multi soliton pulse with FSR and FWHM of 0.6 ns and 20 ps are generated using the add/drop filter system. Here Ultra-short single soliton pulse with FWHM=42 fs can be simulated. These pulses are providing required communication signals to generate pair of polarization entangled photons among different time frame where the polarization control unit and polarizer beam splitter (PBS) are connected to the ring resonator system.
All-optical logic XOR/XNOR gate operation using microring and nanoring reson...University of Malaya (UM)
In this paper, a novel system of simultaneous optical logic AND and OR gates using dark -bright soliton conversion within the add/drop optical filter system is proposed. The input logic „0‟ and control logic „0‟ are formed by using the dark soliton pulse (D) trains. By using the dark-bright soliton conversion behavior within the π/2 phase shift device, we found that the simultaneous optical logic AND and OR gates at the drop and through ports can be randomly formed, respectively.
Secured Transportation of Quantum Codes Using Integrated PANDA-Add/drop and T...University of Malaya (UM)
New system of quantum cryptography for communication networks is proposed. Multi optical Soliton can be generated and propagated via an add/drop interferometer system incorporated with a time division multiple access (TDMA) system. Here the transportation of quantum codes is performed. Chaotic output signals from the PANDA ring resonator are inserted into the add/drop filter system. Using the add/drop filter system multi dark and bright solitons can be obtained and used to generate entangled quantum codes for internet security. In this research soliton pulses with FWHM and FSR of 325 pm and 880 nm are generated, respectively.
NEW SYSTEM OF CHAOTIC SIGNAL GENERATION BASED ON COUPLING COEFFICIENTS APPLI...University of Malaya (UM)
The nonlinear behavior (chaotic) of light traveling in an optical fiber ring resonator such as an add/drop system
is presented. The chaotic behavior is considered to be a beneficial effect that can be used in the communication
system. Such a system can be used to secure the information signals, therefore, the ability of chaotic carriers to synchronize in a communication system is performed. The used optical material is InGaAsP/InP regarding to suitable parameters of the system. The nonlinear refractive index is fixed to n2 = 3.8 × 10−20 m2
/W, and the 20,000 iterations of round-trip within the system is simulated. The input powers are selected at 1 W, where the coupling coefficient of the system varies according to two critical cases, where 0 0.1
and 0.1 1. As a results, larger coupler coefficient corresponds to lower input power for the case of
0 0.1 and smaller coupling coefficient of the system is corresponds to lower input power when
0.1 1. To optimize the microring systems, Lower input power is recommended in many applications in optical optical communication systems.
Dark-Bright Solitons Conversion System for Secured and Long Distance Optical ...University of Malaya (UM)
We suggest a new purpose of a security scheme by employing the nonlinear behaviors of temporal dark and bright solitons amongst a micro-ring resonator system for signal security application. The chaotic signal is generated, where the required bright soliton pulse can be recovered and discovered by an add/drop filtering device. By using the reserve ring parameters, simulation results obtained have demonstrated that the soliton conversion can be performed. In application, the chaotic signal is generated and formed by the dark soliton inside a nonlinear micro-ring device. The different temporal soliton response time can be seen, the response times of 169 and 84 ns are mentioned for temporal dark and bright solitons, respectively, which can also be used to figure the security key. The technique of optical conversion can be use to improve the optical communication network systems.
Nonlinear Chaotic Signals Generation and Transmission within an Optical Fiber...University of Malaya (UM)
The nonlinear behavior of light such as chaos traveling in an optical fiber ring resonator as a single
ring resonator is presented. This phenomenon can be used to generate secret codes or arbitrary digital codes of "0" and "1" applicable in the communication system such as time division multiple access (TDMA) system. Such a system can be used to secure the information signals therefore, the ability of chaotic carriers to synchronize in a communication system is performed. The used optical material is InGaAsP/InP regarding to suitable parameters of the system. The nonlinear refractive index is fixed to n2=3.8 × 10−20 m2
/W. The input power is selected at 1 W, where the coupling coefficient of the system varies as
0 0.1. As a result, train of logic
codes could be generated and transmitted via a fiber communication link using the chaotic signals. To optimize the microring systems, Lower input power is recommended in many applications in optical optical
communication systems.
IOSR Journal of Applied Physics (IOSR-JAP) is an open access international journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
IOSR Journal of Applied Physics (IOSR-JAP) is an open access international journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Similar to Soliton comb generation using add-drop ring resonators (20)
Evaluation of Agro-morphological Performances of Hybrid Varieties of Chili Pe...Premier Publishers
In Benin, chilli pepper is a widely consumed as vegetable whose production requires the use of performant varieties. This work assessed, at Parakou and Malanville, the performance of six F1 hybrids of chilli including five imported (Laali, Laser, Nandi, Kranti, Nandita) and one local (De cayenne), in completely randomized block design at four replications and 15 plants per elementary plot. Agro-morphological data were collected and submitted to analysis of variance and factor analysis of mixed data. The results showed the effects of variety, location and their interactions were highly significant for most of the growth, earliness and yield traits. Imported hybrid varieties showed the best performances compared to the local one. Multivariate analysis revealed that 'De cayenne' was earlier, short in size, thin-stemmed, red fruits and less yielding (≈ 1 t.ha-1). The imported hybrids LaaliF1 and KrantiF1 were of strong vegetative vigor, more yielding (> 6 t.ha-1) by developing larger, long and hard fruits. Other hybrids showed intermediate performances. This study highlighted the importance of imported hybrids in improving yield and preservation of chili fruits. However, stability and adaptation analyses to local conditions are necessary for their adoption.
An Empirical Approach for the Variation in Capital Market Price Changes Premier Publishers
The chances of an investor in the stock market depends mainly on some certain decisions in respect to equilibrium prices, which is the condition of a system competing favorably and effectively. This paper considered a stochastic model which was latter transformed to non-linear ordinary differential equation where stock volatility was used as a key parameter. The analytical solution was obtained which determined the equilibrium prices. A theorem was developed and proved to show that the proposed mathematical model follows a normal distribution since it has a symmetric property. Finally, graphical results were presented and the effects of the relevant parameters were discussed.
Influence of Nitrogen and Spacing on Growth and Yield of Chia (Salvia hispani...Premier Publishers
Chia is an emerging cash crop in Kenya and its production is inhibited by lack of agronomic management information. A field experiment was conducted in February-June and May-August 2021, to determine the influence of nitrogen and spacing on growth and yield of Chia. A randomized complete block design with a split plot arrangement was used with four nitrogen rates as the main plots (0, 40, 80, 120 kg N ha-1) and three spacing (30 cm x 15 cm (s1), 30 cm x 30 cm (s2), 50 cm x 50 cm (s3)). Application of 120 kg N ha-1 significantly increased (p≤0.05) vegetative growth and seed yield of Chia. Stem height, branches, stem diameter and leaves increased by 23-28%, 11-13%, 43-55% and 59-88% respectively. Spacing s3 significantly increased (p≤0.05) vegetative growth. An increase of 27-74%, 36-45% and 73-107% was recorded in number of leaves, stem diameter and dry weight, respectively. Chia yield per plant was significantly higher (p≤0.05) in s3. However, when expressed per unit area, s1 significantly produced higher yields. The study recommends 120 kg N ha-1 or higher nitrogen rates and a closer spacing of 15 cm x 30 cm as the best option for Chia production in Kenya.
Enhancing Social Capital During the Pandemic: A Case of the Rural Women in Bu...Premier Publishers
Social capital plays an essential role in empowering people for social and economic change even during the pandemic. A livelihood project of the government was implemented among the members of a women’s association of a disadvantaged upland community in Bukidnon province, Southern Philippines for inclusive development. This study was conducted to determine the influence of some socio-economic attributes and the change in the knowledge level on the social capital of the rural women amidst the pandemic. The activities of the project were implemented considering the health protocols imposed by the government during the health crisis. The findings revealed that the trainings conducted resulted to a positive change in the knowledge level among the rural women. This facilitated the production of vegetables for their households and generated additional income very necessary during the pandemic especially that other economic activities were hindered. Similarly, there was a significant increase in the social capital of the rural women during the last two years. The main occupation, sources of income and their ethnicity significantly influenced the social capital of the rural women. The rural development workers and policymakers must consider the social capital of the group in the implementation of poverty alleviation programs.
Impact of Provision of Litigation Supports through Forensic Investigations on...Premier Publishers
This paper presents an argument through the fraud triangle theory that the provision of litigation supports through forensic audits and investigations in relation to corporate fraud cases is adequate for effective prosecution of perpetrators as well as corporate fraud prevention. To support this argument, this study operationalized provision of litigation supports through forensic audit and investigations, data mining for trends and patterns, and fraud data collection and preparation. A sample of 500 respondents was drawn from the population of professional accountants and legal practitioners in Nigeria. Questionnaire was used as the instrument for data collection and this was mailed to the respective respondents. Resulting responses were analyzed using the OLS multiple regression techniques via the SPSS statistical software. The results reveal that the provision of litigation supports through forensic audits and investigations, fraud data mining for trends and patterns and fraud data collection and preparation for court proceedings have a positive and significant impact on corporate fraud prevention in Nigeria. This study therefore recommends that regulators should promote the provision of litigation supports through forensic audits and investigations in relation to corporate fraud cases in publicly listed firms in Nigeria, as this will help provide reports that are acceptable in court proceedings.
Improving the Efficiency of Ratio Estimators by Calibration WeightingsPremier Publishers
It is observed that the performances of most improved ratio estimators depend on some optimality conditions that need to be satisfied to guarantee better estimator. This paper develops a new approach to ratio estimation that produces a more efficient class of ratio estimators that do not depend on any optimality conditions for optimum performance using calibration weightings. The relative performances of the proposed calibration ratio estimators are compared with a corresponding global [Generalized Regression (GREG)] estimator. Results of analysis showed that the proposed calibration ratio estimators are substantially superior to the traditional GREG-estimator with relatively small bias, mean square error, average length of confidence interval and coverage probability. In general, the proposed calibration ratio estimators are more efficient than all existing estimators considered in the study.
Urban Liveability in the Context of Sustainable Development: A Perspective fr...Premier Publishers
Urbanization and quality of urban life are mutually related and however it varies geographically and regionally. With unprecedented growth of urban centres, challenge against urban development is more in terms of how to enhance quality of urban life and liveability. Making sense of and measuring urban liveability of urban places has become a crucial step in the context of sustainable development paradigm. Geographical regions depict variations in nature of urban development and consequently level of urban liveability. The coastal regain of West Bengal faces unusual challenges caused by increasing urbanization, uncontrolled growth, and expansion of economic activities like tourism and changing environmental quality. The present study offers a perspective on urban liveability of urban places located in coastal region comprising of Purba Medinipur and South 24 Parganas districts. The study uses the liveability standards covering four major pillars- institutional, social, economic and physical and their indicators. This leads to develop a City Liveability Index to rank urban places of the region, higher the index values better the urban liveability. The data for the purpose is collected from various secondary sources. Study finds that the eastern coastal region of the country covering state of West Bengal depicts variations in index of liveability determined by physical, economic, social and institutional indicators.
Transcript Level of Genes Involved in “Rebaudioside A” Biosynthesis Pathway u...Premier Publishers
Stevia rebaudiana Bertoni is a plant which has recently been used widely as a sweetener. This medicinal plant has some components such as diterpenoid glycosides called steviol glycosides [SGs]. Rebaudioside A is a diterpenoid steviol glycoside which is 300 times sweeter than table sugar. This study was done to investigate the effect of GA3 (50 mg/L) on the expression of 14 genes involved in Rebaudioside A biosynthesis pathway in Stevia rebaudiana under in vitro conditions. The expression of DXS remarkably decreased by day 3. Also, probably because of the negative feedback of GA3 on MEP-drived isoprenes, GGDS transcript level reached its lowest amount after GA3 treatment. The abundance of DXR, CMS, CMK, MCS, and CDPS transcripts showed a significant increase at various days after this treatment. A significant drop in the expression levels of KS and UGT85C2 is detected during the first day. However, expression changes of HDR and KD were not remarkable. Results revealed that the level of transcript of UGT74G1 and UGT76G1 up regulated significantly 4 and 2 times higher than control, respectively. However, more research needs to shed more light on the mechanism of GA3 on gene expression of MEP pathway.
Multivariate Analysis of Tea (Camellia sinensis (L.) O. Kuntze) Clones on Mor...Premier Publishers
Information on genetic variability for biochemical characters is a prerequisite for improvement of tea quality. Thirteen introduced tea clones characterized with objective; assessing tea clones based on morphological characters at Melko and Gera research stations. The study was conducted during 2017/18 cropping season on experimental plots in RCBD with three replications. Data recorded on morphological traits like days from pruning to harvest, height to first branch, stem diameter, leaf serration density, leaf length, leaf width, leaf size, petiole length, leaf ratio, internode length, shoot length, number of shoot, canopy diameter, hundred shoot weight, fresh leaf yield per tree. Cluster analysis of morphological trait grouped into four clusters indicated, the existence of divergence among the tested clones. The maximum inter-cluster distance was between clusters I and IV (35.27) while the minimum inter cluster distance was observed between clusters I and II (7.8).Principal components analysis showed that the first five principal components with eigenvalues greater than one accounted 86.45% for 15 morphological traits. Generally, the study indicated presence of variability for several morphological traits. However, high morphological variation between clones is not a guarantee for a high genetic variation; therefore, molecular studies need to be considered as complementary to biochemical studies.
Causes, Consequences and Remedies of Juvenile Delinquency in the Context of S...Premier Publishers
This research work was designed to examine nature of juvenile offences committed by juveniles, causes of juvenile delinquency, consequences of juvenile delinquency and remedies for juvenile delinquency in the context of Sub-Saharan Africa with specific reference to Eritrea. Left unchecked, juvenile delinquents on the streets engage in petty theft, take alcohol or drugs, rape women, rob people at night involve themselves in criminal gangs and threaten the public at night. To shed light on the problem of juvenile delinquency in the Sub-Saharan region data was collected through primary and secondary sources. A sample size of 70 juvenile delinquents was selected from among 112 juvenile delinquents in remand at the Asmara Juvenile Rehabilitation Center in the Eritrean capital. The study was carried out through coded self-administered questionnaires administered to a sample of 70 juvenile delinquents. The survey evidence indicates that the majority of the juvenile respondents come either from families constructed by unmarried couples or separated or divorced parents where largely the father is missing in the home or dead. The findings also indicate that children born out of wedlock, families led by single mothers, lack of fatherly role models, poor parental-child relationships and negative peer group influence as dominant causes of juvenile infractions. The implication is that broken and stressed families are highly likely to be the breeding grounds for juvenile delinquency. The survey evidence indicates that stealing, truancy or absenteeism from school, rowdy or unruly behavior at school, free-riding in public transportation, damaging the book of fellow students and beating other young persons are the most common forms of juvenile offenses. It is therefore, recommended that parents and guardians should exercise proper parental supervision and give adequate care to transmit positive societal values to children. In addition, the government, the police, prosecution and courts, non-government organizations, parents, teachers, religious leaders, education administrators and other stakeholders should develop a child justice system that strives to prevent children from entering deeper into the criminal justice process.
The Knowledge of and Attitude to and Beliefs about Causes and Treatments of M...Premier Publishers
Stigma and discrimination associated with mental illness are a common occurrence in the Sub-Saharan region including Eritrea. Numerous studies from Sub-Saharan Africa suggest that stigma and discrimination are major problems in the community, with negative attitudes and behavior towards people with mental illness being widespread. In order to assess the whether such negative attitudes persist in the context of Eritrea this study explored the knowledge and perceptions of 90 Eritrean university students at the College of Business and Economics, the University of Asmara regarding the causes and remedies of mental illness A qualitative method involving coded self-administered questionnaires administered to a sample of 90 university students to collecting data at the end of 2019. The survey evidence points that almost 50% of the respondents had contact with a mentally ill person suggesting that the significant number of the respondents experienced a first-hand encounter and knowledge of mental illness in their family and community. The findings show an overall greater science-based understanding of the causes of mental illness to be followed by recommended psychiatric treatments. The survey evidence indicates that the top three leading causes of mental illness in the context of Eritrea according to the respondents are brain disease (76%), bad events in the life of the mentally ill person (66%) and substance abuse or alcohol taking, smoking, taking drugs like hashish. (54%). The majority of the respondents have a very sympathetic and positive outlook towards mentally ill persons suggesting that mentally illness does not simply affect a chosen individual rather it can happen to anybody regardless of economic class, social status, ethnicity race and religion. Medical interventions cited by the majority of the respondents as being effective treatments for mental illness centered on the idea that hospitals and clinics for treatment and even cures for psychiatric disease. Changing perceptions of mental illnesses in Eritrea that paralleled the very caring and sympathetic attitudes of the sample university students would require raising public awareness regarding mental illness through education, using the mass media to raise public awareness, integrating mental health into the primary health care system, decentralizing mental health care services to increase access to treatment and providing affordable service to maintain positive treatment outcomes.
Effect of Phosphorus and Zinc on the Growth, Nodulation and Yield of Soybean ...Premier Publishers
An investigation was carried out at Kogi State University Student Research and Demonstration farm Anyigba during the 2019 wet season to observe the effect of phosphorus and zinc on the growth, nodulation and yield of soybean. The treatments comprised three levels: phosphorus and zinc (0, 30 and 60 kg P2O5/ha; 0, 5 and 10kg Zn/ha) and two varieties TGX 536 – 02D and Samsoy 2. The investigation revealed that application of phosphorus affected growth, nodulation, yield and some yield components of soybean while zinc application, apart from the plant height, which is reduced significantly, had no significant effect on other growth characters, nodulation, yield and yield components. However, it was generally found to decrease most of the characters. Application of 60 kg P2O5/ha gave the highest growth and yield, while 30 kg P2O5/ha gave the highest nodulation. Application of 60 kg P2O5/ha significantly increased yield to 1.9t/ha, which was significantly higher over the control plots, which gave 1.7t/ha. Crude protein and oil contents of the seeds were not significantly affected by phosphorus application but were significantly affected by zinc application, which significantly decreased protein content as its amount an increase from 0 to 10 kg/ha, and significantly increased oil content from 0 to 5kg/ha and decreased it below 5kg/ha. It was also revealed that the two varieties responded similarly to phosphorus and zinc in terms of growth, grain yield and crude protein content of the seeds.
Influence of Harvest Stage on Yield and Yield Components of Orange Fleshed Sw...Premier Publishers
A field experiment was conducted at Adami Tullu Agricultural Research Center in 2018 under rainfed condition with supplementary irrigation to determine the influence of harvest stage on vine yield and tuberous root yield of orange fleshed sweet potato varieties. The experiment consisted of four harvest stages (105, 120, 135 and 150 days after planting) and Kulfo, Tulla and Guntute varieties. A 4 X 3 factorial experiment arranged in randomized complete block design with three replications was used. Interaction of harvest stage and variety significantly influenced above ground fresh biomass, vine length, marketable tuberous root weight per hectare, commercial harvest index and harvest index. The highest mean values of above ground fresh biomass (66.12 t/ha) and marketable tuberous root weight (56.39 t/ha) were produced by Guntute variety harvested at 135 days after planting. Based on the results, it can be recommended that, farmers of the study area can grow Guntute variety by harvesting at 135 days after planting to obtain optimum vine and tuberous root yields.
Performance evaluation of upland rice (Oryza sativa L.) and variability study...Premier Publishers
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2. Soliton comb generation using add-drop ring resonators
Amiri et al 002
In this study the semiconductor material (InGaAsP/InP) is used. The practical parameters are used to simulate and
modelling the system.
Figure 1. Schematic Diagram of an add-drop System
The input optical field ( ) in E in the form of the Gaussian pulse can be expressed by Equation (1)
i t
L
z
E z t E
D
in 0 0 2
( , ) exp (1)
Here 0 E and z are the optical field amplitude and propagation distance, respectively(S. E. Alavi et al., 2014). The
dispersion length of the soliton pulse can be defined as 2
2
0 L T D , where the frequency carrier of the soliton is 0
and 2 is the coefficients of the second order terms of the Taylor expansion of the propagation constant (Amiri I. S. et
al., 2012b). 0 T represents a soliton pulse propagation time(A. Afroozeh et al., 2015; I. S. Amiri et al., 2015).Here, the
soliton represents a pulse that keeps its width invariance as it propagates, known as a temporal or spatial soliton (I. S.
Amiri et al., 2014b). The intensity of soliton peak is | / | 2
2 0 T . When a temporal soliton pulse propagates inside the
microring device, a balance should be achieved between the dispersion length ( ) D L and the nonlinear length
( 1/ ) NL NL L , where 2 0 n k , is the length scale over which disperse or nonlinear effects causes the beam becomes
wider or narrower. For a soliton pulse when the balance between dispersion and nonlinear lengths is achieved, hence
D NL L L . The total refractive index (n) of the system is given by(Amiri I. S. et al., 2010)
( ) , 2
0 2 0 P
A
n
n n n I n
eff
(2)
where 0 n and 2 n are the linear and nonlinear refractive indices, respectively(A. Afroozeh et al., 2014; I. S. Amiri et al.,
2014d). I and P are the optical intensity and optical power, respectively(IS Amiri et al., 2014). eff A represents the
effective mode core area of the device, where in the case of MRRs, the effective mode core areas range from 0.50 to
0.1 m2. When a Gaussian pulse is input and propagates within the MRR, the resonant output is formed for each round-
3. Soliton comb generation using add-drop ring resonators
Int. Res. J. Telecomm. Info. Technol. 003
trip. The normalized output of the light field is defined as the ratio between the output and input fields ( E (t) out and E (t) in )
in each round-trip. Thus, it can be expressed as(Amiri I. S. et al., 2012c; I. S. Amiri and A. Afroozeh, 2014;I. S. Amiri et
al., 2014e)
)
2
(1 1 1 ) 4 1 1 sin (
(1 (1 ) )
(1 ) 1
( )
( )
2
1
2
1
1
2
x x
x
E t
E t
in
out (3)
Here, is the coupling coefficient, x expL/ 2 represents a round-trip loss coefficient, 0 0 kLn and
2
NL 2 in kLn E are the linear and nonlinear phase shifts and k 2 / is the wave propagation number(Amiri I. S. et
al., 2013). Here L and are the waveguide length and linear absorption coefficient, respectively(Nikoukar et al., 2012;
Parisa Naraei et al., 2014). To retrieve the signals from the chaotic noise, we propose to use an add-drop system with
appropriate parameters (Afroozeh et al., 2011; Seyed Mohammad Reza Khalifeh Soltanian and Iraj Sadegh Amiri,
2014). The input powers expressed by Equations (1) and (2), insert into the input and add ports of the add-drop
interferometer system (Popović et al., 2006). Interior optical signals of the system can be expressed by Equations 4 and
5.
n ad
ad
ad
n
ad
jk L
L
L
jk
L
in add
a
e
E j E j e
E
2
1 2
2 2 2
1 2 1
1 (1 ) (1 )
(1 )
(4)
3
2
1 2
2
2 1 2
2
1 2
2 2 2
1 2
1 (1 ) (1 )
(1 ) (1 )
1 (1 ) (1 )
(1 )
E j
e
E j e
e
E j e
E
add
jk L
L
jk L
L
add
jk L
L
L
jk
L
in
b
n ad
ad
n ad
ad
n ad
ad
ad
n
ad
(5)
, where 1 and 2 are the coupling coefficients, ad ad L 2 R and ad R is the radius of the add-drop system. add E is the
input Gaussian pulse into the add port of the system. The through and drop ports output signals from the system are
given by(Amiri I.S. et al., 2011; Amiri I. S. and Ali, 2014):
1
2 2 2
1 1
in
L
jk
L
th b E E j e E
ad
n
ad
(6)
2
2 2 2
2 1
add
L
jk
L
drop a E E j e E
ad
n
ad
(7)
, where th E and drop E represent the optical electric fields of the through and drop ports, respectively. Therefore (Amiri I.S.
and Ali, 2013; Abdolkarim Afroozeh et al., 2014; I.S. Amiri et al., 2014c),
1
4 2
1 2
2
1 2
2
3
4
3
1 2 1 2
2
1 2
2
1 2
1
1 (1 ) (1 )
( ) (1 ) (1 )
1 (1 ) (1 )
1
in
L
jk
L
add
jk L
L
L
jk
L
add
jk L
L
jk L
L
in
th
E e E
e
E e
e
E e
E
ad
n
ad
n ad
ad
ad
n
ad
n ad
ad
n ad
ad
(8)
4. Soliton comb generation using add-drop ring resonators
Amiri et al 004
2
2
1 2
2
2 1
2
1 2
2 2 2
1 2
1
1 (1 ) (1 )
1
1 (1 ) (1 )
add
jk L
L
L jk L
add
jk L
L
L
jk
L
in
drop
E
e
E e
e
E e
E
n ad
ad
ad n ad
n ad
ad
ad
n
ad
(9)
The waveguide (ring resonator) loss is 0.5 dBmm−1(A.Zeinalinezhad et al., 2014; I. S. Amiri et al., 2014a; Iraj
Sadegh Amiri et al., 2014a), where the fractional coupler intensity loss is 0.1(Iraj Sadegh Amiri et al., 2014c).
RESULTS AND DISCUSSION
The Gaussian pulse is input into the input and add ports of the system. The operating wavelength is 1550 nm. The
iterative method is used to generate the results based on practical parameters of the system. The throughput output
signals of the add-drop filter system with two waveguide and coupling factor of 1 = 2 =0.02 in both symmetrical
couplers is shown in Figure 2. The 3dB band width and the free spectral range of the pulses can be adjusted respect to
different configuration and the designs of the ring resonator systems. In this study single ring resonator add-drop filter
system is analysed.
Figure 2. Throughput output signals of the add-drop ring resonator with
L=750μm, 1 = 2 =0.02, α=0
In the following new parameter will be used for simplifying:
2
1
D (1 ) )
2
x Dexp( L
, 1 1 y 1 and 2 2 y 1
The maximum and minimum transmissions are calculated as follows. For the throughput port:
5. Soliton comb generation using add-drop ring resonators
Int. Res. J. Telecomm. Info. Technol. 005
(10)
(11)
and for the drop port:
(12)
(13)
The on-off ratio of an add-drop filter system is given by:
(14)
The output intensity at the drop port will is shown in Figure 3, which indicates that the resonance wavelength is
fully extracted by the resonator when 1 = 2 and α=0.
Figure 3. Drop port output of an add-drop ring resonator with
R=750μm, 1 = 2 =0.02, α=0
The group delay profile of the drop port output referenced to the input port is shown in Figure 4. This group delay is
simulated from drop port respect to the input port. Resonance in this case occurs when θ = (2N+1) π, where N is the
mode number and the required equations to obtain the group delay are given in reference (Schwelb, 2004).
2
1 2
2
1 2
max (1 )
( )
y y x
y y x
T
2
1 2
2
1 2
min (1 )
( )
y y x
y y x
T
2
1 2
2
2
2
1
max (1 )
(1 ).(1 ).
y y x
y y x
T
2
1 2
2
2
2
1
min (1 )
(1 ).(1 ).
y y x
y y x
T
y y x
y y x
T drop port
T throughput port
(1 ).(1 ).
( )
( )
( )
2
2
2
1
2
1 2
min
max
6. Soliton comb generation using add-drop ring resonators
Amiri et al 006
Figure 4. Group delay of the add-drop ring resonator with R=750μm, 1 = 2 =0.02, α=0
CONCLUSION
The add-drop system is used to show constructive interference of the inputs optical Gaussian laser beam. Its
transmission characteristics are theoretically derived and confirmed by the results. Here the transmission characteristics
of the optical through and drop ports output powers and the group delay are presented.
ACKNOWLEDGEMENTS
I. S. Amiri would like to thank the, Photonics Research Centre, Department of Physics, Faculty of Science, University of
Malaya, 50603 Kuala Lumpur, Malaysia for providing the research facilities. The authors acknowledge the financial
support from University Malaya/MOHE under grant number UM.C/625/1/HIR/MOHE/SCI/29.
REFERENCES
Afroozeh A, Sadegh Amiri and Alireza Zeinalinezhad (2014). Micro Ring Resonators and Applications. Saarbrücken,
Germany, LAP LAMBERT Academic Publishing.
Afroozeh A, Amiri IS (2014).Spatial and Temporal Soliton Pulse Generation By Transmission of Chaotic Signals Using
Fiber Optic Link. Advances in Laser and Optics Research. New York, Nova Science Publisher. 11.
Afroozeh A, Amiri IS, Bahadoran M (2011). Simulation and Analysis of Multisoliton Generation Using a PANDA Ring
Resonator System. Chinese Physics Letters 28(10): 104205.
Afroozeh A, Amiri IS, Chaudhary K, Ali J and Yupapin PP (2014).Analysis of Optical Ring Resonator. Advances in Laser
and Optics Research. New York, Nova Science.
Afroozeh A, Amiri IS, Jalil MA, Kouhnavard M, Ali J and Yupapin PP (2011). Multi Soliton Generation for Enhance
Optical Communication. Applied Mechanics and Materials 83: 136-140.
Afroozeh A., Amiri IS, Zeinalinezhad A, Pourmand SE and Ahmad H. (2015). Comparison of Control Light using
Kramers-Kronig Method by Three Waveguides. Journal of Computational and Theoretical Nanoscience (CTN).
7. Soliton comb generation using add-drop ring resonators
Int. Res. J. Telecomm. Info. Technol. 007 Ahsan R, Amiri IS, Shahidinejad A, Ali J and Yupapin PP (2012a). Characterisation of bifurcation and chaos in silicon microring resonator. IET Communications 6(16): 2671-2675.
Alavi SE, Amiri IS, Bahadoran M, Afroozeh A, Idrus SM (2014e). Nanometer Bandwidth Soliton Generation and Experimental Transmission within Nonlinear Fiber Optics Using an Add-Drop Filter System. Journal of Computational and Theoretical Nanoscience (CTN).
Alavi SE, Amiri IS, Idrus' SM (2014d). Solitonic Pulse Generation and Characterization by Integrated Ring Resonators. 5th International Conference on Photonics 2014 (ICP2014). Kuala Lumpur, IEEE.
Alavi SE, Amiri IS, Idrus SM, Supa’at ASM, Ali J and Yupapin PP (2014). All Optical OFDM Generation for IEEE802.11a Based on Soliton Carriers Using MicroRing Resonators. IEEE Photonics Journal 6(1).
Alavi SE, Amiri IS, Idrus SM., Nikoukar A and Ali J (2013b). IEEE 802.15.3c WPAN Standard Using Millimeter Optical Soliton Pulse Generated By a Panda Ring Resonator. IEEE Photonics Journal 5(5): 7901912.
Ali J, Amiri IS (2014). Picosecond Soliton pulse Generation Using a PANDA System for Solar Cells Fabrication. Journal of Computational and Theoretical Nanoscience (CTN) 11(3): 693-701.
Ali J, Amiri IS (2014b). Generating Highly Dark–Bright Solitons by Gaussian Beam Propagation in a PANDA Ring Resonator. Journal of Computational and Theoretical Nanoscience (CTN). 11(4): 1092-1099.
Ali J, Amiri IS, Gifany D (2013). Ultra-short Multi Soliton Generation for Application in Long Distance Communication. Journal of Basic and Applied Scientific Research (JBASR) 3(3): 442-451.
Ali J, Amiri IS, Naraei P (2014b). Review and Theory of Optical Soliton Generation Used to Improve the Security and High Capacity of MRR and NRR Passive Systems. Journal of Computational and Theoretical Nanoscience (CTN) 11(9): 1875-1886.
Amiri IS and Ali J (2013). Data Signal Processing Via a Manchester Coding-Decoding Method Using Chaotic Signals Generated by a PANDA Ring Resonator. Chinese Optics Letters 11(4): 041901(041904).
Amiri IS and Ali J (2014a). Femtosecond Optical Quantum Memory generation Using Optical Bright Soliton. Journal of Computational and Theoretical Nanoscience (CTN). 11(6): 1480-1485.
Amiri IS and Ali J (2014c). Optical Quantum Generation and Transmission of 57-61 GHz Frequency Band Using an Optical Fiber Optics. Journal of Computational and Theoretical Nanoscience (CTN). 11(10): 2130-2135.
Amiri IS, Alavi SE and Ali J (2013a). High Capacity Soliton Transmission for Indoor and Outdoor Communications Using Integrated Ring Resonators. International Journal of Communication Systems.
Amiri IS, Alavi SE, Shahidinejad A, Nikoukar A, Anwar T, Supa’at ASM, Idrus SM and Yen NK (2014). Characterization of Ultra-Short Soliton Generation Using MRRs. The 2014 Third ICT International Student Project Conference (ICT- ISPC2014). Thailand IEEE.
Cai M, Painter O and Vahala KJ (2000). Observation of critical coupling in a fiber taper to a silica-microsphere whispering-gallery mode system. Physical Review Letters 85(1): 74-77.
Grover R, Absil P, Van V, Hryniewicz J, Little B, King O, Calhoun L, Johnson F and Ho P-T (2001). Vertically coupled GaInAsP--InP microring resonators. Optics letters 26(8): 506-508.
Heebner JE and Boyd RW (1999). Enhanced all-optical switching by use of a nonlinear fiber ring resonator. Optics letters 24(12): 847-849.
Hryniewicz J, Absil P, Little B, Wilson R and Ho P (2000). Higher order filter response in coupled microring resonators. IEEE Photonics Technology Letters 12(3): 320-322.
Idrus SM, Amiri IS, Alavi SE (2015). RF signal generation and wireless transmission using PANDA and Add/drop systems. Journal of Computational and Theoretical Nanoscience (CTN).
Idrus SM, Amiri IS, Alavi SE, Supa'at ASM, Ali J, Yupapin PP (2014f). W-Band OFDM Transmission for Radio-over- Fiber link Using Solitonic Millimeter Wave Generated by MRR. IEEE Journal of Quantum Electronics. 50(8): 622 - 628.
Afroozeh A, Amiri IS (2014). Ring Resonator Systems to Perform Optical Communication Enhancement Using Soliton. USA, Springer.
Amiri IS, Ali Nikoukar and Sayed Ehsan Alavi (2014a). Soliton and Radio over Fiber (RoF) Applications. Saarbrücken, Germany, LAP LAMBERT Academic Publishing.
Amiri IS, Sayed Ehsan Alavi and Sevia Mahdaliza Idrus (2014c). Soliton Coding for Secured Optical Communication Link. USA, Springer.
Amiri IS, Sayed Ehsan Alavi, S. M. Idrus, Abdolkarim Afroozeh and Jalil Ali (2014b). Soliton Generation by Ring Resonator for Optical Communication Application. Hauppauge, NY 11788 USA, Nova Science Publishers.
Neo YS, Idrus SM, Rahmat MF, Alavi SE and Amiri IS (2014). Adaptive Control for Laser Transmitter Feedforward Linearization System. IEEE Photonics Journal6(4).
Nikoukar A, Amiri IS, Alavi SE, Shahidinejad A, Anwar T, Supa’at ASM, Idrus SM and Teng' LY (2014). Theoretical and Simulation Analysis of The Add/Drop Filter Ring Resonator Based on the Z-transform Method Theory. The 2014 Third ICT International Student Project Conference (ICT-ISPC2014). Thailand, IEEE.