Se90-xSb10Bix (x=0, 2, 4, 6, 8 & 10) chalcogenide glasses were prepared by well-established melt quenching technique. The glassy nature was verified by X-ray diffraction (XRD). Thin films of these samples were deposited on glass substrate using thermal evaporation technique at room temperature. The transmission spectra of thin films have been taken using UV-VIS-NIR spectrophotometer (Varian Cary 500) in the wavelength range 200 nm to 1500 nm. The refractive index and film thickness are calculated by using envelope method proposed by Swanepoel. The results indicate that n increases with the increasing Bi content which is related to the increased polarizability of the larger Bi atomic radius 1.46 Å compared with the Se atomic radius 1.16 Å. The value of absorption coefficient (α) and hence extinction coefficient (k) has been determined from transmission spectra. Optical band gap (Eg) is estimated using Tauc's extrapolation and is found to decrease from 1.46eV to 1.24 eV with the Bi addition. This behavior of optical band gap is interpreted in terms of electronegativity difference of the atoms involved and cohesive energy of the system. The variation of optical band gap with Bi content has been studied. This study is aiming to examine such structures if they are employed as photonic devices such as photo-detectors, LED's and optical switches.
An Investigation of SILAR Grown Cobalt Selenide Thin Films IIJSRJournal
Nowadays, several deposition techniques have been used to produce thin film materials. The obtained films were characterized by using different tools. These semiconductor materials could be employed in solar cell, laser devices and opto-electronic devices. The main objective of this work is to produce cobalt selenide thin films through successive ionic layer adsorption and reaction method. Advantages of this method include simple procedures, inexpensive equipment, it does not need expensive vacuum system and high quality substrate. During the deposition process, the films were deposited onto soda lime glass under various anionic bath immersion times. The properties of the films were studied for the first time via field emission scanning electron microscopy (FESEM) and UV-visible spectrophotometer. Based on the FESEM analysis, uniform morphology could be observed for the sample produced for 30 seconds (anionic immersion time). The band gap was about 2.6 eV and the optical transmission increased in the visible region could be detected for these samples.
Effect of Sn Doping on Structural and Electrical Properties of ZnO Thin Films...journal ijrtem
Abstract: Un-doped and tin (Sn) doped ZnO films were deposited on heated glass substrates by chemical spray pyrolysis method
(CSP). The effect of Sn concentration on the structural, surface morphological and electrical properties of the SnO2 films was
investigated. XRD analyses showed that the obtained films are polycrystalline in nature with hexagonal structure with preferred
orientation of (101). Doping with tin (Sn) causes increase in the grain size. Atomic force microscopy images showed that the root
mean square of the average surface roughness's varied from (1.48 to 3.58) as dopant concentration increased from 0 to 5 wt.%. The
electrical properties of the Sn ZnO films were strongly influenced by doping concentration. The electrical resistance of the films was
sharply decreased as dopant concentration increased.
Keywords: (ZnO) thin films, Sn Doping, Structural and electrical Properties
Effect of Temperature on Structural, Morphological and Optical Properties of ...RSIS International
The Pure zinc oxide (ZnO) thin films of different substrate temperature have been prepared on well cleaned glass substrate by improved spray pyrolysis technique. The gross structure of the annealed films have been examined by X- ray diffraction (XRD) technique using powder X- ray diffractometer which reveals the enhancement of crystallinity with increase in the deposition temperature. Surface morphology of the synthesized ZnO thin films have been analyzed by means of atomic force microscopy (AFM) which reveals average particle size of as synthesize ZnO thin films has been found to be 79 nm. The band gap as deposited ZnO have been examined by UV-Vis spectroscopy carried out in absorption mode by Double Beam UV- VIS Spectrophotometer with radiations in the range of 훌= 190 nm to 1100 nm which is in the range of 3.03 eV to 3.16 eV.
An Investigation of SILAR Grown Cobalt Selenide Thin Films IIJSRJournal
Nowadays, several deposition techniques have been used to produce thin film materials. The obtained films were characterized by using different tools. These semiconductor materials could be employed in solar cell, laser devices and opto-electronic devices. The main objective of this work is to produce cobalt selenide thin films through successive ionic layer adsorption and reaction method. Advantages of this method include simple procedures, inexpensive equipment, it does not need expensive vacuum system and high quality substrate. During the deposition process, the films were deposited onto soda lime glass under various anionic bath immersion times. The properties of the films were studied for the first time via field emission scanning electron microscopy (FESEM) and UV-visible spectrophotometer. Based on the FESEM analysis, uniform morphology could be observed for the sample produced for 30 seconds (anionic immersion time). The band gap was about 2.6 eV and the optical transmission increased in the visible region could be detected for these samples.
Effect of Sn Doping on Structural and Electrical Properties of ZnO Thin Films...journal ijrtem
Abstract: Un-doped and tin (Sn) doped ZnO films were deposited on heated glass substrates by chemical spray pyrolysis method
(CSP). The effect of Sn concentration on the structural, surface morphological and electrical properties of the SnO2 films was
investigated. XRD analyses showed that the obtained films are polycrystalline in nature with hexagonal structure with preferred
orientation of (101). Doping with tin (Sn) causes increase in the grain size. Atomic force microscopy images showed that the root
mean square of the average surface roughness's varied from (1.48 to 3.58) as dopant concentration increased from 0 to 5 wt.%. The
electrical properties of the Sn ZnO films were strongly influenced by doping concentration. The electrical resistance of the films was
sharply decreased as dopant concentration increased.
Keywords: (ZnO) thin films, Sn Doping, Structural and electrical Properties
Effect of Temperature on Structural, Morphological and Optical Properties of ...RSIS International
The Pure zinc oxide (ZnO) thin films of different substrate temperature have been prepared on well cleaned glass substrate by improved spray pyrolysis technique. The gross structure of the annealed films have been examined by X- ray diffraction (XRD) technique using powder X- ray diffractometer which reveals the enhancement of crystallinity with increase in the deposition temperature. Surface morphology of the synthesized ZnO thin films have been analyzed by means of atomic force microscopy (AFM) which reveals average particle size of as synthesize ZnO thin films has been found to be 79 nm. The band gap as deposited ZnO have been examined by UV-Vis spectroscopy carried out in absorption mode by Double Beam UV- VIS Spectrophotometer with radiations in the range of 훌= 190 nm to 1100 nm which is in the range of 3.03 eV to 3.16 eV.
Structural Properties of (SnO2)1-x(ZnO)xThin Films Deposited By Spray Pyrolys...IJAEMSJORNAL
Nano structure of mixed (SnO2)1-x(ZnO)x thin films were prepared by spray pyrolysis technique at a substrate temperature of 400°C. The films deposited were 190 nm thickness. The XRD analysis for its structural characteristic has been performed. The average grain size was found to be between 21.27 and 15.80 nm.AFM Atomic Force microscope gives good information about the surface topography of the film.It is understood that the crystallinity of SnO2increases with increasing ZnO Vol.%.
EFFECT OF ZN CONCENTRATION ON STRUCTURAL AND OPTICAL PROPRIETIES OF ZNO THIN ...AEIJjournal2
ZnO thin film were deposited by spray pyrolysis on glass substrates, using zinc nitrate as precursor with
different molar concentrations varying from 0.05M to 0.2 M. To study the structural proprieties of the film ,
the different technique was used as the X-ray diffraction, atomic force microscopy (AFM), Raman
scattering , and FTIR . The optical properties were explored by transmission, reflectivity and
Photoluminescence techniques. The ZnO thin films obtained in this paper are polycrystallines, the grain
size increases when the molar concentration of Zn precursor was increasing. The films are transparent in
visible region, this transmission values decreases when the molar concentration increase caused by the
increasing of surface roughness
Optical and Dielectric Studies on Semiorganic Nonlinear Optical Crystal by So...ijrap
The field of nonlinear optics became practically a reality after the invention of laser. High performance electro-optic switching elements for telecommunication and optical information processing are based on materials with high nonlinear optical (NLO) properties. Single crystals of nonlinear optical material Llysine sulphate (LLS) are grown by slow evaporation technique. The crystal structure and lattice parameters are determined for the grown crystal by single X-ray diffraction studies. The wide transparency range of the crystals in the visible region of the electromagnetic spectrum is identified by the UV-Vis-NIR technique. The mechanical property of the grown crystal is determined by Vicker’s microhardness test. It is observed from the microhardness studies of the grown crystals that the hardness increases with increase in load. Meyer’s index n is calculated which proves that the material belongs to soft material category. The dielectric constant and dielectric loss are calculated by varying the frequencies at room temperature. The emission of green light on passing the Nd: YAG laser confirms the second harmonic generation (SHG) property of the crystals .The SHG efficiency of the crystals are found to be better than that of Potassium Di hydrogen Phosphate (KDP)
Improvement Structural and Optical Properties of ZnO/ PVA Nanocompositesiosrjce
IOSR Journal of Applied Physics (IOSR-JAP) is a double blind peer reviewed 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.
This paper reports the effect of the different deposition methods towards the ZnO nanostructure crystal quality and film thickness on the polyimide substrate. The ZnO film has been deposited by using the spray pyrolysis technique, sol-gel and RF Sputtering. Different methods give a different nanostructure of the ZnO thin film. Sol gel methods, results of nanoflowers ZnO thin film with the thickness of thin film is 600nm. It also produces the best of the piezoelectric effect in term of electrical performance, which is 5.0 V and 12 MHz of frequency which is higher than other frequency obtained by spray pyrolysis and RF sputtering.
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.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
MPC-EAR : Maximal Power Conserved And Energy Aware Routing in Ad hoc Networksijsrd.com
Power preservation in wireless ad hoc networks is a decisive factor as energy resources are inadequate at the electronic devices in use. Power-aware routing strategies are fundamentally route selection strategies built on accessible ad hoc routing protocols. This paper proposed a new Maximal Power Conserved And Energy Aware Routing (MPC-EAR ) topology for mobile ad hoc networks that enhances the network life span. Simulation results prove that the projected protocol has a higher performance other minimal energy usage, energy level aware and energy conserving routing protocols such as MTPR, MMECR and CMMECR.
Experimental Investigation on Performance, Emission and Combustion Characteri...ijsrd.com
Continuous rise in the conventional fuel prices and shortage of its supply have increased the interest in the field of the alternative sources for petroleum fuels. In this present work, experimentation was carried out to study the performance, emission and combustion characteristics of desert date biodiesel and its blends. For this experiment a single cylinder, four strokes, naturally aspired, direct injection, water cooled, eddy current dynamometer Kirloskar diesel engine at 1500 rpm for variable loads. Initially, desert date biodiesel and its blends were chosen. The physical and chemical properties of desert date biodiesel were determined. The tests were carried out over entire range of engine operation at varying conditions of load. The engine performance parameters studied were brake horse power, brake specific fuel consumption, brake thermal efficiency, exhaust temperature and mechanical efficiency. The emission characteristics studied are CO, HC, NOx and smoke opacity. These results are compared to those of pure diesel. These results are again compared to the other results of neat oils available in the literature for validation. By analyzing the graphs, it was observed that performance characteristics are reduced and emission characteristics are lowered compare to the diesel. This is mainly due to lower calorific value, higher viscosity and delayed combustion process. From the analysis of graphs it is observed that B10 and B20 blends are best suited for diesel engine. The present experimental results show that fish oil biodiesel and its blends can be used as an alternative fuel in diesel engine.
Structural Properties of (SnO2)1-x(ZnO)xThin Films Deposited By Spray Pyrolys...IJAEMSJORNAL
Nano structure of mixed (SnO2)1-x(ZnO)x thin films were prepared by spray pyrolysis technique at a substrate temperature of 400°C. The films deposited were 190 nm thickness. The XRD analysis for its structural characteristic has been performed. The average grain size was found to be between 21.27 and 15.80 nm.AFM Atomic Force microscope gives good information about the surface topography of the film.It is understood that the crystallinity of SnO2increases with increasing ZnO Vol.%.
EFFECT OF ZN CONCENTRATION ON STRUCTURAL AND OPTICAL PROPRIETIES OF ZNO THIN ...AEIJjournal2
ZnO thin film were deposited by spray pyrolysis on glass substrates, using zinc nitrate as precursor with
different molar concentrations varying from 0.05M to 0.2 M. To study the structural proprieties of the film ,
the different technique was used as the X-ray diffraction, atomic force microscopy (AFM), Raman
scattering , and FTIR . The optical properties were explored by transmission, reflectivity and
Photoluminescence techniques. The ZnO thin films obtained in this paper are polycrystallines, the grain
size increases when the molar concentration of Zn precursor was increasing. The films are transparent in
visible region, this transmission values decreases when the molar concentration increase caused by the
increasing of surface roughness
Optical and Dielectric Studies on Semiorganic Nonlinear Optical Crystal by So...ijrap
The field of nonlinear optics became practically a reality after the invention of laser. High performance electro-optic switching elements for telecommunication and optical information processing are based on materials with high nonlinear optical (NLO) properties. Single crystals of nonlinear optical material Llysine sulphate (LLS) are grown by slow evaporation technique. The crystal structure and lattice parameters are determined for the grown crystal by single X-ray diffraction studies. The wide transparency range of the crystals in the visible region of the electromagnetic spectrum is identified by the UV-Vis-NIR technique. The mechanical property of the grown crystal is determined by Vicker’s microhardness test. It is observed from the microhardness studies of the grown crystals that the hardness increases with increase in load. Meyer’s index n is calculated which proves that the material belongs to soft material category. The dielectric constant and dielectric loss are calculated by varying the frequencies at room temperature. The emission of green light on passing the Nd: YAG laser confirms the second harmonic generation (SHG) property of the crystals .The SHG efficiency of the crystals are found to be better than that of Potassium Di hydrogen Phosphate (KDP)
Improvement Structural and Optical Properties of ZnO/ PVA Nanocompositesiosrjce
IOSR Journal of Applied Physics (IOSR-JAP) is a double blind peer reviewed 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.
This paper reports the effect of the different deposition methods towards the ZnO nanostructure crystal quality and film thickness on the polyimide substrate. The ZnO film has been deposited by using the spray pyrolysis technique, sol-gel and RF Sputtering. Different methods give a different nanostructure of the ZnO thin film. Sol gel methods, results of nanoflowers ZnO thin film with the thickness of thin film is 600nm. It also produces the best of the piezoelectric effect in term of electrical performance, which is 5.0 V and 12 MHz of frequency which is higher than other frequency obtained by spray pyrolysis and RF sputtering.
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.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
MPC-EAR : Maximal Power Conserved And Energy Aware Routing in Ad hoc Networksijsrd.com
Power preservation in wireless ad hoc networks is a decisive factor as energy resources are inadequate at the electronic devices in use. Power-aware routing strategies are fundamentally route selection strategies built on accessible ad hoc routing protocols. This paper proposed a new Maximal Power Conserved And Energy Aware Routing (MPC-EAR ) topology for mobile ad hoc networks that enhances the network life span. Simulation results prove that the projected protocol has a higher performance other minimal energy usage, energy level aware and energy conserving routing protocols such as MTPR, MMECR and CMMECR.
Experimental Investigation on Performance, Emission and Combustion Characteri...ijsrd.com
Continuous rise in the conventional fuel prices and shortage of its supply have increased the interest in the field of the alternative sources for petroleum fuels. In this present work, experimentation was carried out to study the performance, emission and combustion characteristics of desert date biodiesel and its blends. For this experiment a single cylinder, four strokes, naturally aspired, direct injection, water cooled, eddy current dynamometer Kirloskar diesel engine at 1500 rpm for variable loads. Initially, desert date biodiesel and its blends were chosen. The physical and chemical properties of desert date biodiesel were determined. The tests were carried out over entire range of engine operation at varying conditions of load. The engine performance parameters studied were brake horse power, brake specific fuel consumption, brake thermal efficiency, exhaust temperature and mechanical efficiency. The emission characteristics studied are CO, HC, NOx and smoke opacity. These results are compared to those of pure diesel. These results are again compared to the other results of neat oils available in the literature for validation. By analyzing the graphs, it was observed that performance characteristics are reduced and emission characteristics are lowered compare to the diesel. This is mainly due to lower calorific value, higher viscosity and delayed combustion process. From the analysis of graphs it is observed that B10 and B20 blends are best suited for diesel engine. The present experimental results show that fish oil biodiesel and its blends can be used as an alternative fuel in diesel engine.
A Study on 3D Finite Element Analysis of Anterior Cruciate Ligament Behavior ...ijsrd.com
The present study deals with the force and stress distribution within the anteromedial (AM) and posterolateral (PL) bundles of the anterior cruciate ligament (ACL) in response to an anterior tibial load with the knee at full extension was calculated using a validated three dimensional finite element model (FEM) of a human ACL. The interaction between the AM and PL bundles, as well as the contact and friction caused by the ACL wrapping around the bone during knee motion, were included in the model. The AM and PL bundles of the ACL were simulated as incompressible homogeneous and isotropic hyperelastic materials. The validated FEM was then used to calculate the force and stress distribution within the ACL under an anterior tibial load at full extension. The AM and PL bundles shared the force, and the stress distribution was non-uniform within both bundles with the highest stress localized near the femoral insertion site. The contact and friction caused by the ACL wrapping around the bone during knee motion played the role of transferring the force from the ACL to the bone, and had a direct effect on the force and stress distribution of the ACL. This validated model will enable the analysis of force and stress distribution in the ACL in response to more complex loading conditions and has the potential to help design improved surgical procedures following ACL injuries.
Audio/Speech Signal Analysis for Depressionijsrd.com
The word “depressed†is a common everyday word. People might say "I am depressed" when in fact they mean "I am fed up because I have had a row, or failed an exam, or lost my job", etc. These ups and downs of life are common and normal. Most people recover quite quickly. Depression is identified by different methods. Here we are identified depression by MFCC (Mel Frequency Ceptral Coefficient) method. There are different parameters used for the identification of depressed speech and normal speech, but MFCCs based parameter is the most applicable information then other parameter because depressive speech or audio signal can contain more information in the higher energy bands when compared with normal speech.
A High Accuracy, Low Power, Reproducible Temperature Telemetry Systemijsrd.com
Sense amplifiers are extensively used in memory. Sense amplifiers are one of the most vital circuits in the periphery of CMOS memories. We know that memory is the heart of all digital systems. Today all worlds are demanding high speed and low power dissipation as well as small area. We know that speed and power dissipation of memory is overall depends upon the sense amplifier we used and their performance strongly affects both memory access time, and overall memory power dissipation. So it is important to design a good sense amplifier which performs well in both speed and power dissipation. In this dissertation, an implementation of a most efficient sense amplifier is done by comparing the best known sense amplifier in today. The dissertation focuses on design, simulation and performance analysis of sense amplifiers. In this thesis, current latch sense amplifier and body bias controlled current latch sense amplifier are designed and results compared. The result shows that the body bias controlled current latch sense amplifier is performing best. The result also shows a novel sense amplifier which consumes small power at same time its speed is faster than other sense amplifiers.
Survey of Wireless Sensor Network Applicationijsrd.com
Sensor networks offer a powerful combination of distributed sensing, computing and communication. They lend themselves to countless applications and, at the same time, offer numerous challenges due to their peculiarities, primarily the stringent energy constraints to which sensing nodes are typically subjected. The distinguishing traits of sensor networks have a direct impact on the hardware design of the nodes at least four levels: power source, processor, communication hardware, and sensors. Various hardware platforms have already been designed to test the many ideas spawned by the re-search community and to implement applications to virtually all fields of science and technology. We are convinced that CAS will be able to provide a substantial contribution to the development of this exciting field. A wireless sensor network (WSN) has important applications such as remote environmental monitoring and target tracking. This has been enabled by the availability, particularly in recent years, of sensors that are smaller, cheaper, and intelligent. These sensors are equipped with wireless interfaces with which they can communicate with one another to form a network. The design of a WSN depends significantly on the application, and it must consider factors such as the environment, the application's design objectives, cost, hardware, and system constraints. The goal of our survey is to present a comprehensive review of the recent literature since the publication of [I.F. Akyildiz, W. Su, Y. Sankarasubramaniam, E. Cayirci, A survey on sensor networks, IEEE Communications Magazine, 2002]. Following a top-down approach, we give an overview of several new applications and then review the literature on various aspects of WSNs. We classify the problems into three different categories: (1) Internal platform and underlying operating system, (2) Communication protocol stack, and (3) Network services, provisioning, and deployment. We review the major development in these three categories and outline new challenges.
Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object and thus in contrast to in situ observation. In modern usage, the term generally refers to the use of aerial sensor technologies to detect and classify objects on Earth (both on the surface, and in the atmosphere and oceans) by means of propagated signals (e.g. electromagnetic radiation). It may be split into active remote sensing (when a signal is first emitted from aircraft or satellites)[1][2][3] or passive (e.g. sunlight) when information is merely recorded.
Design, Development and Experimental Investigation of Epitrochoid Internal Lo...ijsrd.com
The trochoidal drives are widely used in the industry for the constant flow requirements. The design of the lobe profile for positive displacement internal lobe pump (Gerotor) requires MATLAB, Auto-CAD, Solidworks and MasterCAM software. The main objective behind this development of epitrochoid lobe rotor is to increase the flow as well as decrease in noise level (smooth operation). This epitrochoid curve requires set of parametric equations, which is solved with the help of MATLAB. The epitrochoid lobe profile requires modelling for the manufacturing purpose, which requires modelling as well as manufacturing software like AutoCAD, Solidworks, MasterCAM and CNC for code generating. At the last the developed profile has been manufactured and tested to check its technical feasibility. The test results are examined and compared with existing model of lob rotor.
Bridge-Stage Framework for the Smartphone Application Development using HTML5ijsrd.com
Now a days, the Web has become an integral part of our everyday lives. The rapid growth of the smart phone market has brought the Web from our home desks to anywhere we are, and enabled us to access this vast source of information at any time. The mobile operating systems (OS) used by modern smart phones are too diverse such as Google's Android, Apple's iOS, Microsoft's Windows Phone, and so on. Smartphone application development is done using native platform such as iPhone using Objective-C, Android using Java, Windows Mobile using C# and so on. Therefore, a bridge stage framework which supports 'Write once and deploy everywhere' is required to support the development of Smartphone applications. This paper presents the HTML5-based bridge stage framework which uses Phone Gap and Web kit to support the development of Smartphone applications that are written as Web applications. A big problem with developing applications for mobile devices is platform fragmentation [6]. That means that there are many different mobile platforms that are further divided by the different versions available [5][2]. Users with older hardware are left without support and updates as newer devices are put out on the market [9]. This means that the developer has the choice between limiting the solutions and only aim for a minor part of the spectra or to develop for more platforms to reach as many users as possible. To maximize the amount of possible users, the developer has to create an application for each platform and make sure that they are backwards compatible so that users with older devices can use them.
Secure High Capacity Data Hiding in Images using EDBTCijsrd.com
Block truncation coding is an efficient compression technique which has low computational complexity but it has two major issues like blocking and false counter effects .So here we have used error-diffused BTC that improves above deficiencies using visual low pass compensation on the bitmap. In this paper complementary hiding EDBTC is developed to resolve the above issue. In this project a single water mark is embedded and then multiple water marks are embedded .usually we use an adaptive external bias factor to embed the watermark but it damages the image quality and robustness .So here we use an extremely small bias factor to control the watermark embedding and this enables a high capacity scenario without significantly damaging image quality. Until now a few data hiding schemes are proposed but it damages the characteristics of BTC. The security of embedded water mark is high that it can’t be easy extracted by the malicious users. The watermark is encrypted by standard encryption algorithm and then it is embedded.
Web Usage Mining: A Survey on User's Navigation Pattern from Web Logsijsrd.com
With an expontial growth of World Wide Web, there are so many information overloaded and it became hard to find out data according to need. Web usage mining is a part of web mining, which deal with automatic discovery of user navigation pattern from web log. This paper presents an overview of web mining and also provide navigation pattern from classification and clustering algorithm for web usage mining. Web usage mining contain three important task namely data preprocessing, pattern discovery and pattern analysis based on discovered pattern. And also contain the comparative study of web mining techniques.
BANs are commonly regarded as an enabling technology for a variety of applications, including health and fitness monitoring, emergency response and device control. Recent breakthroughs in solid-state electronics afford for the creation of low-power, low-profile devices that can be modularly interconnected in order to create so-called sensor nodes comprised of one or more sensor devices, a microcontroller unit (MCU), and a radio transceiver that eliminates the need for wires to communicate with the coordinator node in order to transfer the collected data. In this survey, a review of the on-going research in WBANs in terms of system architecture, applications, how it different from Wireless Sensor Network and also describes the MAC protocols in WBAN.
Problems Causing due to Chemical Pesticides and its Effect on Environmentijsrd.com
Agriculture has been facing the destructive activities of numerous pests like insects, weeds and fungi, from time immemorial, leading to radical decrease in yields. To encounter these problems and for protection of the crops application of pesticides is primary and old method. The pesticides residues create severe problems as cause toxicity to humans and warm-blooded animals. Include the development of insecticide resistance, resurgence, secondary pest outbreak and use-cancellation or de-registration of some insecticides due to human health and environmental concerns. Pesticides pollution is categorized into diffuse and point sources. Diffuse contamination via leaching, runoff, drainage and drift usually contributes only the smaller part of pesticide pollution of surface and groundwater. However, point sources or farmyard activities are significant contributors to pesticide pollution of surface water. This article reviews the different type of pesticides and its effect of on environment.
WDA: Wormhole Attack Detection Algorithm based on measuring Round Trip Delay ...ijsrd.com
The recent advancements in the wireless arena and their wide-spread utilization have introduced new security vulnerabilities. The wireless media being shared is exposed to outside world, so it is susceptible to various attacks at different layers of OSI network stack. For example, jamming and device tampering at the physical layer; disruption of the medium access control (MAC) layer; routing attacks like Blackhole, rushing, wormhole; targeted attacks on the transport protocol like session hijacking, SYN flooding or even attacks intended to disrupt specific applications through viruses, worms and Trojan Horses. Wormhole attack is one of the serious routing attacks amongst all the network layer attacks launched on MANET. Wormhole attack is launched by creation of tunnels and it leads to total disruption of the routing paths on MANET. In this paper, Wormhole detection algorithm (WDA) is proposed based on modifying the forwarding packet process that detects and isolates wormhole nodes in ad hoc on demand distance vector (AODV) routing protocol.
Comparison of Several PaaS Cloud Computing Platformsijsrd.com
Today, the question is less about whether or not to use Platform as a Services (PaaS), but rather which providers to use. PaaS is a computing platform that abstracts the infrastructure, OS, and middleware to drive developer productivity. PaaS offerings are "polyglot" and "polyhost". Selection of Platform as a Service provider is an important process because an ideal vendor will be able to continue to partner with company as company grows. There are many components to be consider while selecting PaaS vendor like Scalability, Availability, Manageability, Performance, Security, Accessibility, Billing At a high-level a PaaS helps organizations, specifically by providing a fast and scalable way to host applications in the cloud.
APPLICATION OF STATCOM to IMPROVED DYNAMIC PERFORMANCE OF POWER SYSTEMijsrd.com
Application of FACTS controller called Static Synchronous Compensator STATCOM to improve the performance of power grid with Wind Farms is investigated .The essential feature of the STATCOM is that it has the ability to absorb or inject fastly the reactive power with power grid . Therefore the voltage regulation of the power grid with STATCOM FACTS device is achieved. Moreover restoring the stability of the power system having wind farm after occurring severe disturbance such as faults or wind farm mechanical power variation is obtained with STATCOM controller . The dynamic model of the power system having wind farm controlled by proposed STATCOM is developed . To validate the powerful of the STATCOM FACTS controller, the studied power system is simulated and subjected to different severe disturbances. The results prove the effectiveness of the proposed STATCOM controller in terms of fast damping the power system oscillations and restoring the power system stability.
Utilization of Coconut Shell in Different Forms in Concreteijsrd.com
The rising cost of material is a matter of concern in this developing construction environment. The prices of building material such as cement, sand, gravel etc. are increasing day by day. The reason for increase in cost is high demand and less availability of material. Nowadays, most of the researchers are doing research on the material which can reduce the cost of construction as well as increase the strength. Research on waste material such as fly ash, rice husk, slag and sludge from treatment of industrial and domestic waste water demolished building material is being done. Use of coconut shell in concrete is not only useful economically but also environmentally useful for human being. Coconut shell is one of the main contributors of pollution problem as a solid waste. Coconut shell used as coarse aggregate in concrete encouraged sustainable and environmentally helpful material in the construction field. Since cement rate increases day per day and its availability is decreasing as per time so it can be useful to use coconut shell ash used as substitute of cement in concrete. Coconut shell can be used in the form of powder with epoxy resins or epoxy matrixes in concrete also. Composites are made by combining two or more natural or artificial materials to maximize their useful properties and minimize their weaknesses.
Removal of Heavy Metals from Aqueous Solution Using Ion Exchange Resin MBHPE-TKPijsrd.com
The aim of this study is to synthesis of TKP (MBHPE-TKP) resin for the removal of heavy metals from aqueous solution. Ion exchange resins are polymers that are capable of exchanging particular ions within the polymer with ions in a solution that is passed through them. This ability is also seen in various natural systems such as soils and living cells. The synthetic resins are used primarily for purifying water, but also for various other applications including separating out some elements. Factorial design of experiments is employed to study the effect of above factors pH, time and sorbent used. The new synthesized resins i.e. MBHPE–TKP is hydrophilic and biodegradable, so after effluent treatment used resins can be disposed off without facing any environmental problem .This study focuses on synthesis of new cation exchange resin (MBHPE – TKP) and developing method for treatment of highly contaminated industrial effluents.
Design, Analysis and weight optimization of Crane Hook: A Reviewijsrd.com
Crane hook are highly liable component and are always subjected to failure due to accumulation of large amount of stress which can eventually lead to its failure .In this present work, to study the different design parameter & stress pattern of crane hook in its loaded condition for different cross section, the design and drafting of crane hook will be prepared by using ANSYS 14.5. By finite element analysis, the stress which is to be formed in various cross section are compared with design calculation .The stress concentration factors are used in strength and durability evaluation of structure and machine element. In this work and also we observe the parameter that affects the weight reduction.
Optical characterization of Se90S10-xCdx thin filmsIOSR Journals
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International Journal of Engineering and Science Invention (IJESI)inventionjournals
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Copper indium sulphide films were deposited by the
pulse plating technique with different OFF times in the range of
5s – 30s and at a constant current density of 5 mA cm-2. The
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size increased with decrease of OFF time. Optical band gap of the
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Due to availability of internet and evolution of embedded devices, Internet of things can be useful to contribute in energy domain. The Internet of Things (IoT) will deliver a smarter grid to enable more information and connectivity throughout the infrastructure and to homes. Through the IoT, consumers, manufacturers and utility providers will come across new ways to manage devices and ultimately conserve resources and save money by using smart meters, home gateways, smart plugs and connected appliances. The future smart home, various devices will be able to measure and share their energy consumption, and actively participate in house-wide or building wide energy management systems. This paper discusses the different approaches being taken worldwide to connect the smart grid. Full system solutions can be developed by combining hardware and software to address some of the challenges in building a smarter and more connected smart grid.
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Interactive Technologies for Improving Quality of Education to Build Collabor...ijsrd.com
Today with advancement in Information Communication Technology (ICT) the way the education is being delivered is seeing a paradigm shift from boring classroom lectures to interactive applications such as 2-D and 3-D learning content, animations, live videos, response systems, interactive panels, education games, virtual laboratories and collaborative research (data gathering and analysis) etc. Engineering is emerging with more innovative solutions in the field of education and bringing out their innovative products to improve education delivery. The academic institutes which were once hesitant to use such technology are now looking forward to such innovations. They are adopting the new ways as they are realizing the vast benefits of using such methods and technology. The benefits are better comprehensibility, improved learning efficiency of students, and access to vast knowledge resources, geographical reach, quick feedback, accountability and quality research. This paper focuses on how engineering can leverage the latest technology and build a collaborative learning environment which can then be integrated with the national e-learning grid.
Internet of Things - Paradigm Shift of Future Internet Application for Specia...ijsrd.com
In the world more than 15% people are living with disability that also include children below age of 10 years. Due to lack of independent support services specially abled (handicap) people overly rely on other people for their basic needs, that excludes them from being financially and socially active. The Internet of Things (IoT) can give support system and a better quality of life as well as participation in routine and day to day life. For this purpose, the future solutions for current problems has been introduced in this paper. Daunting challenges have been considered as future research and glimpse of the IoT for specially abled person is given in the paper.
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Internet of things (IoT) is the most powerful invention and if used in the positive direction, internet can prove to be very productive. But, now a days, due to the social networking sites such as Face book, WhatsApp, twitter, hike etc. internet is producing adverse effects on the student life, especially those students studying at college Level. As it is rightly said, something which has some positive effects also has some of the negative effects on the other hand. In this article, we are discussing some adverse effects of IoT on student’s life.
Pedagogy for Effective use of ICT in English Language Learningijsrd.com
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In recent years usage of private vehicles create urban traffic more and more crowded. As result traffic becomes one of the important problems in big cities in all over the world. Some of the traffic concerns are traffic jam and accidents which have caused a huge waste of time, more fuel consumption and more pollution. Time is very important parameter in routine life. The main problem faced by the people is real time routing. Our solution Virtual Eye will provide the current updates as in the real time scenario of the specific route. This research paper presents smart traffic navigation system, based on Internet of Things, which is featured by low cost, high compatibility, easy to upgrade, to replace traditional traffic management system and the proposed system can improve road traffic tremendously.
Ontological Model of Educational Programs in Computer Science (Bachelor and M...ijsrd.com
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DESIGN AND ANALYSIS OF DOUBLE WISHBONE SUSPENSION SYSTEM USING FINITE ELEMENT...ijsrd.com
Double wishbone designs allow the engineer to carefully control the motion of the wheel throughout suspension travel. 3-D model of the Lower Wishbone Arm is prepared by using CAD software for modal and stress analysis. The forces and moments are used as the boundary conditions for finite element model of the wishbone arm. By using these boundary conditions static analysis is carried out. Then making the load as a function of time; quasi-static analysis of the wishbone arm is carried out. A finite element based optimization is used to optimize the design of lower wishbone arm. Topology optimization and material optimization techniques are used to optimize lower wishbone arm design.
A Review: Microwave Energy for materials processingijsrd.com
Microwave energy is a latest largest growing technique for material processing. This paper presents a review of microwave technologies used for material processing and its use for industrial applications. Advantages in using microwave energy for processing material include rapid heating, high heating efficiency, heating uniformity and clean energy. The microwave heating has various characteristics and due to which it has been become popular for heating low temperature applications to high temperature applications. In recent years this novel technique has been successfully utilized for the processing of metallic materials. Many researchers have reported microwave energy for sintering, joining and cladding of metallic materials. The aim of this paper is to show the use of microwave energy not only for non-metallic materials but also the metallic materials. The ability to process metals with microwave could assist in the manufacturing of high performance metal parts desired in many industries, for example in automotive and aeronautical industries.
Making model of dual axis solar tracking with Maximum Power Point Trackingijsrd.com
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Study and Review on Various Current Comparatorsijsrd.com
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Rotating machineries are always subject to vibrations due to critical speeds, unbalance, and instability. Usually the least expensive modification of a machine to make is the bearing. A wide variety of bearings have been developed to combat some of the different types of vibration problems. This report consist the analysis of 360deg hydrodynamic bearing of Boiler Feed water Pump. The boiler feed water pump is very critical rotatory equipment of Thermal power plant the bearing of this pump must be able to withstand in vibration and other hydraulic forces while still maintaining a high degree of reliability. This report consist analysis and design of 360 hydrodynamic bearing also replacing fixed pad by flexural pad and analysis bearing vibration and compare vibration for the same condition with the help of FEM Method in ANSYS.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Effect of Bi Content on Optical Properties of Se-Sb-Bi Chalcogenide Amorphous Thin Films
1. IJSRD - International Journal for Scientific Research & Development| Vol. 2, Issue 09, 2014 | ISSN (online): 2321-0613
All rights reserved by www.ijsrd.com 93
Effect of Bi Content on Optical Properties of Se-Sb-Bi Chalcogenide
Amorphous Thin Films
Nidhi Jain1
S. L. Kakani2
K. C. Pancholi3
1,2,3
Department of Physics
1,2,3
M. L. V. Govt. College, Bhilwara, Rajasthan, India
Abstract— Se90-xSb10Bix (x=0, 2, 4, 6, 8 & 10)
chalcogenide glasses were prepared by well-established melt
quenching technique. The glassy nature was verified by X-
ray diffraction (XRD). Thin films of these samples were
deposited on glass substrate using thermal evaporation
technique at room temperature. The transmission spectra of
thin films have been taken using UV-VIS-NIR
spectrophotometer (Varian Cary 500) in the wavelength
range 200 nm to 1500 nm. The refractive index and film
thickness are calculated by using envelope method proposed
by Swanepoel. The results indicate that n increases with the
increasing Bi content which is related to the increased
polarizability of the larger Bi atomic radius 1.46 Å
compared with the Se atomic radius 1.16 Å. The value of
absorption coefficient (α ) and hence extinction coefficient (
k ) has been determined from transmission spectra. Optical
band gap (Eg) is estimated using Tauc’s extrapolation and is
found to decrease from 1.46eV to 1.24 eV with the Bi
addition. This behavior of optical band gap is interpreted in
terms of electronegativity difference of the atoms involved
and cohesive energy of the system. The variation of optical
band gap with Bi content has been studied. This study is
aiming to examine such structures if they are employed as
photonic devices such as photo-detectors, LED’s and optical
switches.
Key words: Chalcogenide thin films, optical properties,
Band gap, XRD
I. INTRODUCTION
In recent years, the optical memory effects in chalcogenide
semiconducting films have been investigated and utilized for
various applications. Due to their high refractive index
(ranging between 2.0 and 3.5) and optical band gap lying in
the sub-band gap region, chalcogenide glasses are used as
core materials for optical fibres which is further used for
transmission, especially when short length and flexibility is
required [1-2]. Selenium exhibits the unique property of
reversible phase transformation. Its various device
applications such as rectifiers, photocells, xerography,
switching and memory, etc., have made it attractive, but
pure selenium has disadvantages such as short lifetime and
low sensitivity [3]. Due to high glass forming ability of Se,
it represents a good host matrix for the investigation of
chalcogenide glasses in the bulk and thin film forms. Thus,
the above problems can be overcome by alloying Se with
some impurity atoms (Bi, Te, Ge, Ga, As, etc.), which gives
higher sensitivity and crystallization temperature, and
smaller aging effects [4]. Here we have chosen Sb as an
additive due to its ability to improve the thermal stability of
the Se drastically [5]. The addition of third element expands
the glass forming area and also creates compositional and
configurationally disorder in the system. The addition of
impurities like Bi has produced a remarkable change in the
optical and electrical properties of chalcogenide glasses. The
conductivity of chalcogenide glasses changes from p to n
type due to Bi addition [6]. The aim of the present
investigation is to study the effect of Bi incorporation on the
optical properties of Se-Sb matrix. A method proposed by
Swanepoel [7-8] which is based on the use of extremes of
the interference fringes of the transmittance spectrum,
enables us to calculate the value of refractive index and film
thickness.
II. EXPERIMENTAL DETAILS
The bulk material of Se90-xSb10Bix(x=0, 2, 4, 6, 8, 10) were
prepared by the conventional melt-quenching technique.
High-purity (99.999%) Se, Sb and Bi in appropriate atomic
weight proportions were sealed in a quartz ampoule under a
vacuum of 10-5
Torr. The ampoules (length 10.5 cm and 8
mm internal diameter) were then heated at 900 0
C for about
18 hours with continuous rotation to facilitate
homogenization of the sample. The molten samples were
rapidly quenched in ice-cooled water. Thin films of these
glassy materials were prepared using thermal evaporation
technique at room temperature under the vacuum of 5×10-6
Torr. The amorphous nature of the thin film was ascertained
using X-ray diffractometry (Bruker AXS D-8 Advance
Diffractometry) with Cu Kα-radiation source (λ= 1.540 Å).
The XRD pattern of Se86Sb10Bi4 thin film is shown in Figure
1. The absence of any sharp peak in the XRD pattern
confirms the amorphous nature of the film. The possible
differences between the compositions of the evaporation
source material and the film deposited onto the substrate
were determined by Energy-Dispersive X-ray Analysis
(EDAX), by making use of a field emission scanning
electron microscopy (FEI Quanta 200F model) shown in
Figure 2. The results show that the composition of the thin
films grown is equal to that of the bulk source material
within 2 atomic %. Transmission spectra have been taken
using UV-VIS-NIR spectrophotometer (Varian Cary 5000).
III. RESULTS AND DISCUSSION
The X-ray diffractograms of typical as-deposited films on
glass substrate kept at room temperature do not reveal any
peak corresponding to Bragg’s condition, as shown in
Figure 1, thus, the as deposited films were found to be
amorphous. The compositions of as-deposited Se90-
xSb10Bix(x=0, 2, 4, 6, 8 & 10) thin films were investigated
using energy dispersive X-ray analysis (EDAX). Figure 2
shows the spectral distribution of the constituent elements
for the Se86Sb10Bi4 thin films. The atomic percentage ratio
of Se, Sb and Bi are listed below in Table 1 Optical
transmission T is a very complex function and is strongly
dependent on the absorption coefficient.
2. Effect of Bi Content on Optical Properties of Se-Sb-Bi Chalcogenide Amorphous Thin Films
(IJSRD/Vol. 2/Issue 09/2014/021)
All rights reserved by www.ijsrd.com 94
Sample
EDAX Data
Optical band gap
(eV)
Se
(at.
%)
Sb
(at.
%)
Bi
(at.
%)
Se90Sb10 91.4 9.6 - 1.46
Se88Sb10Bi2 88.2 9.8 1.9 1.41
Se86Sb10Bi4 86.4 9.7 3.9 1.39
Se84Sb10Bi6 84.5 9.8 5.7 1.35
Se82Sb10Bi8 82.4 9.8 7.8 1.31
Se80Sb10Bi10 80.4 9.7 9.9 1.24
Table 1: The EDAX data and optical band gap for Se90-
xSb10Bix(x=0, 2, 4, 6, 8, 10 at %) thin film
A. Optical band gap
A spectral change in the optical absorption near the band
edge is characterized by α (ν) which increase exponentially
with hν obeying the exponential relation:
α (ν) = αο exp (hν/ Es)
Where αο is constants and Es is interpreted as the
width of tails of the localized states in the gap, it represents
the degree of disorder. We have performed UV-visible
absorption spectroscopy before and after annealing to study
the variation of band gap Eg in the film. The energy gap Eg
can be determined by absorption coefficient data as the
function of photon energy (hν) using this eqn .
αhν = A(hν − Eg)n
Where A is a constant and n characterizes the
transition process. We can see n = 2 and 2/3 for direct
allowed and forbidden transitions, respectively, and n = 1/2
and 1/3 for indirect allowed and forbidden transitions, Tauc
relation[11] this method has been used in chalcogenide
glasses by various workers [12-15].
Fig. 2: Curve of hυ and (αhυ)1/2
Fig. 3: Variation of band gap (Eg) with Bi concentration
The values of optical band gap Eg are also given in
Table 1 for each sample. It is evident from the table that
optical band gap Eg are estimated to be range 1.46 to 1.24
eV (Fig2) decreases with Bi-content. The optical band gap
is a bond sensitive property [16].
IV. CONCLUSION
The transmission spectra of vacuum evaporated Se90-
xSb10Bix thin films taken at normal incidence have been
analyzed in the spectral range 200-1500 nm and the various
optical parameters are calculated. The refractive index and
film thickness are calculated by using envelope method
proposed by Swanepoel. The optical absorption in the given
system seems to be of non-direct type and the optical band
gap determined in the strong absorption region by Tauc’s
extrapolation is found to decrease from 1.39 to 1.24 eV by
the addition of Bi content.
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1.2 1.5 1.8
0
100
200
300
(h
1/2
(eVcm
-1
)
1/2
energy (eV)
x=0
x=2
x=4
x=6
x=8
x=10
0 5 10
1.2
1.3
1.4
1.5
Bandgap(eV)
Bi Concentration
Bandgap(eV)
3. Effect of Bi Content on Optical Properties of Se-Sb-Bi Chalcogenide Amorphous Thin Films
(IJSRD/Vol. 2/Issue 09/2014/021)
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