The norm of elastic constant tensor and the norms of the irreducible parts of the elastic constants of
Intermetallic compounds are calculated. The relation of the scalar parts norm and the other parts norms
and the anisotropy of these compounds are presented. The norm ratios are used to study anisotropy of
these compounds.
Study of Measurement of luminescence life time of the Nd3+ ions in the 6-FDA/...IJERA Editor
Luminescence life time measurements of the Nd3+ ions in the 6-FDA/UVR and Al2o3 hosts were performed
using a Laser diode emitting at 800nm as the excitation source. Optical losses in both materials have been
studied and compared absorption bands of Nd3+ have been observed at 580nm ,745nm, 800nm and 870nm .
Based on which Judd- ofelt analysis has been applied to study the transition properties of Nd3+ ions in the two
hosts. Photoluminescence spectra of Nd3+ have been experimentally studied and emission around 880nm,
1060nm and 1330nm is observed, which indicates that Nd3+ ions are active in these two hosts.
Photocatalytic Mechanism Control and Study of Carrier Dynamics in CdS@C3N5 Co...Pawan Kumar
We present a potential solution to the problem of extraction of photogenerated holes from CdS nanocrystals and nanowires. The nanosheet form of C3N5 is a low-band-gap (Eg = 2.03 eV), azo-linked graphenic carbon nitride framework formed by the polymerization of melem hydrazine (MHP). C3N5 nanosheets were either wrapped around CdS nanorods (NRs) following the synthesis of pristine chalcogenide or intercalated among them by an in situ synthesis protocol to form two kinds of heterostructures, CdS-MHP and CdS-MHPINS, respectively. CdS-MHP improved the photocatalytic degradation rate of 4-nitrophenol by nearly an order of magnitude in comparison to bare CdS NRs. CdS-MHP also enhanced the sunlight-driven photocatalytic activity of bare CdS NWs for the decolorization of rhodamine B (RhB) by a remarkable 300% through the improved extraction and utilization of photogenerated holes due to surface passivation. More interestingly, CdS-MHP provided reaction pathway control over RhB degradation. In the absence of scavengers, CdS-MHP degraded RhB through the N-deethylation pathway. When either hole scavenger or electron scavenger was added to the RhB solution, the photocatalytic activity of CdS-MHP remained mostly unchanged, while the degradation mechanism shifted to the chromophore cleavage (cycloreversion) pathway. We investigated the optoelectronic properties of CdS-C3N5 heterojunctions using density functional theory (DFT) simulations, finite difference time domain (FDTD) simulations, time-resolved terahertz spectroscopy (TRTS), and photoconductivity measurements. TRTS indicated high carrier mobilities >450 cm2 V–1 s–1 and carrier relaxation times >60 ps for CdS-MHP, while CdS-MHPINS exhibited much lower mobilities <150 cm2 V–1 s–1 and short carrier relaxation times <20 ps. Hysteresis in the photoconductive J–V characteristics of CdS NWs disappeared in CdS-MHP, confirming surface passivation. Dispersion-corrected DFT simulations indicated a delocalized HOMO and a LUMO localized on C3N5 in CdS-MHP. C3N5, with its extended π-conjugation and low band gap, can function as a shuttle to extract carriers and excitons in nanostructured heterojunctions, and enhance performance in optoelectronic devices. Our results demonstrate how carrier dynamics in core–shell heterostructures can be manipulated to achieve control over the reaction mechanism in photocatalysis.
ELECTRICAL PROPERTIES OF NI0.4MG0.6FE2O4 SYNTHESIZED BY CONVENTIONAL SOLID-ST...IAEME Publication
Ni0.4Mg0.6Fe2O4 samples are prepared by conventional double sintering approach and sintered at 1300oC/ 2 h. These ferrites are characterized using X-ray diffractometer. The diffraction study reveals that the present compound shows perfect single phase cubic spinel structure. In addition, the behavior of distinct electrical properties such as dielectric constant (ε'), dielectric loss (ε") and ac-conductivity (σac) as a function frequency as well as temperature is analyzed using the LCR controller
Flexible and Ultrasoft Inorganic 1D Semiconductor and Heterostructure Systems...Pawan Kumar
Low dimensionality and high flexibility are key demands for flexible electronic semiconductor devices. SnIP, the first atomic-scale double helical semiconductor combines structural anisotropy and robustness with exceptional electronic properties. The benefit of the double helix, combined with a diverse structure on the nanoscale, ranging from strong covalent bonding to weak van der Waals interactions, and the large structure and property anisotropy offer substantial potential for applications in energy conversion and water splitting. It represents the next logical step in downscaling the inorganic semiconductors from classical 3D systems, via 2D semiconductors like MXenes or transition metal dichalcogenides, to the first downsizeable, polymer-like atomic-scale 1D semiconductor SnIP. SnIP shows intriguing mechanical properties featuring a bulk modulus three times lower than any IV, III-V, or II-VI semiconductor. In situ bending tests substantiate that pure SnIP fibers can be bent without an effect on their bonding properties. Organic and inorganic hybrids are prepared illustrating that SnIP is a candidate to fabricate flexible 1D composites for energy conversion and water splitting applications. SnIP@C3N4 hybrid forms an unusual soft material core–shell topology with graphenic carbon nitride wrapping around SnIP. A 1D van der Waals heterostructure is formed capable of performing effective water splitting.
My research at Boston University (May 2013)
1. Thesis: Viscoelastic testing and modeling of PDMS micropillars for cellular force measurement
2. Side Projects
1) Conducting polymer actuators
2) PDMS and conducting polymer nanowire composites
3) Silicon oxycarbide thin films
4) Tribological study of DLC coatings
Effect of calcination on the electrical properties and quantum confinement of...eSAT Journals
Abstract Fe2O3 nanoparticles have been prepared by a simple solvothermal method using a domestic microwave oven. X-ray powder diffraction measurement indicates the amorphous nature of the as-prepared sample. Calcined samples were obtained by annealing the as-prepared sample at different temperatures, viz. 400, 500, 600 and 700oC. Transmission electron microscopic images indicate that all the five samples are spherical in shape. AC electrical measurements were carried out on pelletized samples by the parallel plate capacitor method at various temperatures ranging from 40-130oC and frequencies ranging from 100 Hz -1 MHz. Results indicate low AC electrical conductivities and consequently show the occurrence of nano confined states. The exciton Bohr radii obtained from the dielectric constant values at 40oC temperature and 1 kHz frequency are 41.8, 54.8, 55.3, 56.3 and 27.0 respectively for the as-prepared sample and samples calcined at 400, 500, 600 and 700oC which indicate a strong quantum confinement effect. The impedance spectra observed exhibit non-ideal behavior. Keywords: Semiconductors, Magnetic materials, Nanoparticles, Electrical properties
Study of Measurement of luminescence life time of the Nd3+ ions in the 6-FDA/...IJERA Editor
Luminescence life time measurements of the Nd3+ ions in the 6-FDA/UVR and Al2o3 hosts were performed
using a Laser diode emitting at 800nm as the excitation source. Optical losses in both materials have been
studied and compared absorption bands of Nd3+ have been observed at 580nm ,745nm, 800nm and 870nm .
Based on which Judd- ofelt analysis has been applied to study the transition properties of Nd3+ ions in the two
hosts. Photoluminescence spectra of Nd3+ have been experimentally studied and emission around 880nm,
1060nm and 1330nm is observed, which indicates that Nd3+ ions are active in these two hosts.
Photocatalytic Mechanism Control and Study of Carrier Dynamics in CdS@C3N5 Co...Pawan Kumar
We present a potential solution to the problem of extraction of photogenerated holes from CdS nanocrystals and nanowires. The nanosheet form of C3N5 is a low-band-gap (Eg = 2.03 eV), azo-linked graphenic carbon nitride framework formed by the polymerization of melem hydrazine (MHP). C3N5 nanosheets were either wrapped around CdS nanorods (NRs) following the synthesis of pristine chalcogenide or intercalated among them by an in situ synthesis protocol to form two kinds of heterostructures, CdS-MHP and CdS-MHPINS, respectively. CdS-MHP improved the photocatalytic degradation rate of 4-nitrophenol by nearly an order of magnitude in comparison to bare CdS NRs. CdS-MHP also enhanced the sunlight-driven photocatalytic activity of bare CdS NWs for the decolorization of rhodamine B (RhB) by a remarkable 300% through the improved extraction and utilization of photogenerated holes due to surface passivation. More interestingly, CdS-MHP provided reaction pathway control over RhB degradation. In the absence of scavengers, CdS-MHP degraded RhB through the N-deethylation pathway. When either hole scavenger or electron scavenger was added to the RhB solution, the photocatalytic activity of CdS-MHP remained mostly unchanged, while the degradation mechanism shifted to the chromophore cleavage (cycloreversion) pathway. We investigated the optoelectronic properties of CdS-C3N5 heterojunctions using density functional theory (DFT) simulations, finite difference time domain (FDTD) simulations, time-resolved terahertz spectroscopy (TRTS), and photoconductivity measurements. TRTS indicated high carrier mobilities >450 cm2 V–1 s–1 and carrier relaxation times >60 ps for CdS-MHP, while CdS-MHPINS exhibited much lower mobilities <150 cm2 V–1 s–1 and short carrier relaxation times <20 ps. Hysteresis in the photoconductive J–V characteristics of CdS NWs disappeared in CdS-MHP, confirming surface passivation. Dispersion-corrected DFT simulations indicated a delocalized HOMO and a LUMO localized on C3N5 in CdS-MHP. C3N5, with its extended π-conjugation and low band gap, can function as a shuttle to extract carriers and excitons in nanostructured heterojunctions, and enhance performance in optoelectronic devices. Our results demonstrate how carrier dynamics in core–shell heterostructures can be manipulated to achieve control over the reaction mechanism in photocatalysis.
ELECTRICAL PROPERTIES OF NI0.4MG0.6FE2O4 SYNTHESIZED BY CONVENTIONAL SOLID-ST...IAEME Publication
Ni0.4Mg0.6Fe2O4 samples are prepared by conventional double sintering approach and sintered at 1300oC/ 2 h. These ferrites are characterized using X-ray diffractometer. The diffraction study reveals that the present compound shows perfect single phase cubic spinel structure. In addition, the behavior of distinct electrical properties such as dielectric constant (ε'), dielectric loss (ε") and ac-conductivity (σac) as a function frequency as well as temperature is analyzed using the LCR controller
Flexible and Ultrasoft Inorganic 1D Semiconductor and Heterostructure Systems...Pawan Kumar
Low dimensionality and high flexibility are key demands for flexible electronic semiconductor devices. SnIP, the first atomic-scale double helical semiconductor combines structural anisotropy and robustness with exceptional electronic properties. The benefit of the double helix, combined with a diverse structure on the nanoscale, ranging from strong covalent bonding to weak van der Waals interactions, and the large structure and property anisotropy offer substantial potential for applications in energy conversion and water splitting. It represents the next logical step in downscaling the inorganic semiconductors from classical 3D systems, via 2D semiconductors like MXenes or transition metal dichalcogenides, to the first downsizeable, polymer-like atomic-scale 1D semiconductor SnIP. SnIP shows intriguing mechanical properties featuring a bulk modulus three times lower than any IV, III-V, or II-VI semiconductor. In situ bending tests substantiate that pure SnIP fibers can be bent without an effect on their bonding properties. Organic and inorganic hybrids are prepared illustrating that SnIP is a candidate to fabricate flexible 1D composites for energy conversion and water splitting applications. SnIP@C3N4 hybrid forms an unusual soft material core–shell topology with graphenic carbon nitride wrapping around SnIP. A 1D van der Waals heterostructure is formed capable of performing effective water splitting.
My research at Boston University (May 2013)
1. Thesis: Viscoelastic testing and modeling of PDMS micropillars for cellular force measurement
2. Side Projects
1) Conducting polymer actuators
2) PDMS and conducting polymer nanowire composites
3) Silicon oxycarbide thin films
4) Tribological study of DLC coatings
Effect of calcination on the electrical properties and quantum confinement of...eSAT Journals
Abstract Fe2O3 nanoparticles have been prepared by a simple solvothermal method using a domestic microwave oven. X-ray powder diffraction measurement indicates the amorphous nature of the as-prepared sample. Calcined samples were obtained by annealing the as-prepared sample at different temperatures, viz. 400, 500, 600 and 700oC. Transmission electron microscopic images indicate that all the five samples are spherical in shape. AC electrical measurements were carried out on pelletized samples by the parallel plate capacitor method at various temperatures ranging from 40-130oC and frequencies ranging from 100 Hz -1 MHz. Results indicate low AC electrical conductivities and consequently show the occurrence of nano confined states. The exciton Bohr radii obtained from the dielectric constant values at 40oC temperature and 1 kHz frequency are 41.8, 54.8, 55.3, 56.3 and 27.0 respectively for the as-prepared sample and samples calcined at 400, 500, 600 and 700oC which indicate a strong quantum confinement effect. The impedance spectra observed exhibit non-ideal behavior. Keywords: Semiconductors, Magnetic materials, Nanoparticles, Electrical properties
Effect of calcination on the electrical properties and quantum confinement of...eSAT Publishing House
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
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
Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferriteijtsrd
The nanocrystalline particles of Aluminium Al doped nickel Ni ferrites with general formula NiAlxFe2 xO4 x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were synthesized by sol gel auto combustion technique. The formation of single phase cubic spinel was confirmed by X ray diffraction analyses. Morphological features of the samples are studied by Scanning Electron Microscopy SEM to examine the particle size, shape and homogeneity of sample. The magnetic hysteresis graphs were obtained to understand their magnetic behaviours. The relative permeability µr of AlNi ferrite samples shows a decrease for all samples as Al content increases. Sandar Oo | Ye Wint Tun | Shwe Zin Oo "Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd25240.pdfPaper URL: https://www.ijtsrd.com/physics/other/25240/porosity-and-the-magnetic-properties-of-aluminium-doped-nickel-ferrite/sandar-oo
Study of characterization of (peo+kclo4) polymer electrolyte systemeSAT Publishing House
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
Study of characterization of (peo+kclo4) polymer electrolyte systemeSAT Journals
Abstract Solid state polymer electrolytes have been prepared by using poly (ethylene oxide) (PEO) and KClO4 salt in the Wt% ratios of (90:10), (80:20) and (70:30) by solution – casting technique by using methanol (water-free) as solvent. The complexation of pure PEO with KClO4 salts has been extensively studied using IR studies. In the Differential Scanning Calorimetry (DSC) curves it observed that, pure PEO melting temperature (Tm) slight shift towards lower temperature is due to the addition of KClO4 salt to the polymer. XRD data for these films clearly confirm the complexation between the KClO4 salt and the polymer PEO. The d-values calculated from the X-ray diffraction of pure PEO and various compositions of KClO4 complexed films are clearly indicate the complexation of PEO and KClO4. Keywords: Polymer electrolytes, IR studies, differential scanning calorimetry, X-ray diffraction.
Dynamic Analysis of Rotating stepped Shaft with Transverse CrackIJERA Editor
This study describes dynamic analysis of stepped shaft with single crack of EN8 material. The objective is to compare results of healthy stepped shaft and single cracked stepped shaft for different crack depth ratios at variable rpm .The dynamic analysis is carried out by using finite element method. Obtained results from analysis are benchmarked from literature. It is observed that there is 84.80% increase in amplitude of acceleration of cracked shaft. Also modal analysis of shaft has been carried out to know effect on natural frequencies of healthy shaft and cracked shaft. The effects of crack depth, crack length & RPM on amplitude of acceleration are obtained.
The Futures of the Physic-Chemical and Thermoelectric Properties of the InTe-...theijes
By the methods of the physic-chemical analysis as well the measurements of microhadness and picknomentric density the semiconducting system InTe-Cu2ZnSnS4 has been investigated and its state diagram has been plotted. Guazibinarity of the system with restricted homogeneous fields has established on the basis of both initial components. The boundaries of solid solutions at 300K reach on side of InTe ~ 2mol% and on side of Cu2ZnSnS4 ~ 13mol%. The coordinates of the system eutectic correspond to the composition ~23mol% Cu2ZnSnS4 and temperature ~813K. A study of thermoelectric and galvanomagnetic parameters of solid solutions (InTe)1-x(Cu2ZnSnS4)x showed dispersion of electrons from the ionized admixture at low temperatures, and at higher temperatures from thermal vibrations of crystalline lattice. Heat transfer takes place according to one-phonon mechanism. The alloy of solid solution (InTe)0,98(Cu2ZnSnS4)0,02 possesses a high value of thermoelectric efficiency.
Elastic moduli measurement of solid using ultrasonic techniqueAbu Sufyan Malik
Ultrasonic Testing is used for measuring characteristics of a material i.e. Elastic Modulus, Grain Size Measurement, Material Characterization and Velocity of Waves develop in a Waveguide. We used ‘Echo-Pulse Transducer’ to develop the guided wave in the waveguide of which we used as specimen(Cu). The values obtained experimentally and conventionally are explained in detail and compared in the respective slides.
Influence of the speed in advance and the laser’s power on the zone affected ...IOSR Journals
Abstract: The Laser cutting is a very important manufacturing technology. But this method has some
disadvantages, among which we find the emergence of a Thermically Affected Zone ZAT can dramatically alter
the characteristics of the processed material which affects its behaviour during its use. For this, we have tried in
this article to study the effect of the forward speed and the laser power in this area (thickness, hardening). In
this context, tests were made on steel C45 where we relied on the method of experiment plans to create a
mathematical model Significant coefficients are obtained by carrying out a variance analysis ANOVA on the
level of 5% of significance. We find that the speed in advance and the power of the laser have a great effect on
the ZAT.
Keywords: Cutting, Laser CO2, Heat Affected Zone.
International Journal of Pharmaceutical Science Invention (IJPSI) is an international journal intended for professionals and researchers in all fields of Pahrmaceutical Science. IJPSI publishes research articles and reviews within the whole field Pharmacy and Pharmaceutical Science, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Computations of Acoustic Wave Propagation in II-VI Hexagonal Semiconductor Compounds
Original Research Article
Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 65–70
Pramod Kumar Yadawa *
Preparation of lithium ferrite nanoparticles by high energy ball milling and ...IJERA Editor
Ferrites are ferrimagnetic ceramic materials with inherent useful electromagnetic properties. Of them, spinelstructured ferrites are promising materials for microwave device applications; stress/torsion sensors and energy storage applications like anode materials in lithium batteries, fuel cells, solar cells etc. Nanostructured spinels further have high and wide scope of potential applications. In the present study, two different types of varied sized ferrimagnetic lithium ferrite spinel nanoparticles prepared using chemical sol-gel auto-combustion method were chosen. The prepared spinel particles were heated at 300°C for 1h. After heating the powders were milled using a High Energy Ball Mill for 30 minutes to further grind the particles and then subjected to various characterizations. Structural characterization was done using X-Ray Diffraction Method (XRD). The study revealed the spinel structure of these samples. Structural parameter such as lattice constant was determined using XRD data and found that the lattice parameter agrees with the standard data. DLS study found the agglomerations of the nanoparticles. The synthesized nanospinel particles were also characterized by the UVVis Spectroscopy, the Fourier Transform Infrared Spectroscopy (FTIR). Finally the magnetic hysteresis properties were studied using a Vibrating Sample Magnetometer (VSM)
Study of Measurement of luminescence life time of the Nd3+ ions in the 6-FDA/...IJERA Editor
Luminescence life time measurements of the Nd3+ ions in the 6-FDA/UVR and Al2o3 hosts were performed
using a Laser diode emitting at 800nm as the excitation source. Optical losses in both materials have been
studied and compared absorption bands of Nd3+
have been observed at 580nm ,745nm, 800nm and 870nm .
Based on which Judd- ofelt analysis has been applied to study the transition properties of Nd3+ ions in the two
hosts. Photoluminescence spectra of Nd3+ have been experimentally studied and emission around 880nm,
1060nm and 1330nm is observed, which indicates that Nd3+ ions are active in these two hosts.
Effect of calcination on the electrical properties and quantum confinement of...eSAT Publishing House
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
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
Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferriteijtsrd
The nanocrystalline particles of Aluminium Al doped nickel Ni ferrites with general formula NiAlxFe2 xO4 x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were synthesized by sol gel auto combustion technique. The formation of single phase cubic spinel was confirmed by X ray diffraction analyses. Morphological features of the samples are studied by Scanning Electron Microscopy SEM to examine the particle size, shape and homogeneity of sample. The magnetic hysteresis graphs were obtained to understand their magnetic behaviours. The relative permeability µr of AlNi ferrite samples shows a decrease for all samples as Al content increases. Sandar Oo | Ye Wint Tun | Shwe Zin Oo "Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd25240.pdfPaper URL: https://www.ijtsrd.com/physics/other/25240/porosity-and-the-magnetic-properties-of-aluminium-doped-nickel-ferrite/sandar-oo
Study of characterization of (peo+kclo4) polymer electrolyte systemeSAT Publishing House
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
Study of characterization of (peo+kclo4) polymer electrolyte systemeSAT Journals
Abstract Solid state polymer electrolytes have been prepared by using poly (ethylene oxide) (PEO) and KClO4 salt in the Wt% ratios of (90:10), (80:20) and (70:30) by solution – casting technique by using methanol (water-free) as solvent. The complexation of pure PEO with KClO4 salts has been extensively studied using IR studies. In the Differential Scanning Calorimetry (DSC) curves it observed that, pure PEO melting temperature (Tm) slight shift towards lower temperature is due to the addition of KClO4 salt to the polymer. XRD data for these films clearly confirm the complexation between the KClO4 salt and the polymer PEO. The d-values calculated from the X-ray diffraction of pure PEO and various compositions of KClO4 complexed films are clearly indicate the complexation of PEO and KClO4. Keywords: Polymer electrolytes, IR studies, differential scanning calorimetry, X-ray diffraction.
Dynamic Analysis of Rotating stepped Shaft with Transverse CrackIJERA Editor
This study describes dynamic analysis of stepped shaft with single crack of EN8 material. The objective is to compare results of healthy stepped shaft and single cracked stepped shaft for different crack depth ratios at variable rpm .The dynamic analysis is carried out by using finite element method. Obtained results from analysis are benchmarked from literature. It is observed that there is 84.80% increase in amplitude of acceleration of cracked shaft. Also modal analysis of shaft has been carried out to know effect on natural frequencies of healthy shaft and cracked shaft. The effects of crack depth, crack length & RPM on amplitude of acceleration are obtained.
The Futures of the Physic-Chemical and Thermoelectric Properties of the InTe-...theijes
By the methods of the physic-chemical analysis as well the measurements of microhadness and picknomentric density the semiconducting system InTe-Cu2ZnSnS4 has been investigated and its state diagram has been plotted. Guazibinarity of the system with restricted homogeneous fields has established on the basis of both initial components. The boundaries of solid solutions at 300K reach on side of InTe ~ 2mol% and on side of Cu2ZnSnS4 ~ 13mol%. The coordinates of the system eutectic correspond to the composition ~23mol% Cu2ZnSnS4 and temperature ~813K. A study of thermoelectric and galvanomagnetic parameters of solid solutions (InTe)1-x(Cu2ZnSnS4)x showed dispersion of electrons from the ionized admixture at low temperatures, and at higher temperatures from thermal vibrations of crystalline lattice. Heat transfer takes place according to one-phonon mechanism. The alloy of solid solution (InTe)0,98(Cu2ZnSnS4)0,02 possesses a high value of thermoelectric efficiency.
Elastic moduli measurement of solid using ultrasonic techniqueAbu Sufyan Malik
Ultrasonic Testing is used for measuring characteristics of a material i.e. Elastic Modulus, Grain Size Measurement, Material Characterization and Velocity of Waves develop in a Waveguide. We used ‘Echo-Pulse Transducer’ to develop the guided wave in the waveguide of which we used as specimen(Cu). The values obtained experimentally and conventionally are explained in detail and compared in the respective slides.
Influence of the speed in advance and the laser’s power on the zone affected ...IOSR Journals
Abstract: The Laser cutting is a very important manufacturing technology. But this method has some
disadvantages, among which we find the emergence of a Thermically Affected Zone ZAT can dramatically alter
the characteristics of the processed material which affects its behaviour during its use. For this, we have tried in
this article to study the effect of the forward speed and the laser power in this area (thickness, hardening). In
this context, tests were made on steel C45 where we relied on the method of experiment plans to create a
mathematical model Significant coefficients are obtained by carrying out a variance analysis ANOVA on the
level of 5% of significance. We find that the speed in advance and the power of the laser have a great effect on
the ZAT.
Keywords: Cutting, Laser CO2, Heat Affected Zone.
International Journal of Pharmaceutical Science Invention (IJPSI) is an international journal intended for professionals and researchers in all fields of Pahrmaceutical Science. IJPSI publishes research articles and reviews within the whole field Pharmacy and Pharmaceutical Science, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Computations of Acoustic Wave Propagation in II-VI Hexagonal Semiconductor Compounds
Original Research Article
Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 65–70
Pramod Kumar Yadawa *
Preparation of lithium ferrite nanoparticles by high energy ball milling and ...IJERA Editor
Ferrites are ferrimagnetic ceramic materials with inherent useful electromagnetic properties. Of them, spinelstructured ferrites are promising materials for microwave device applications; stress/torsion sensors and energy storage applications like anode materials in lithium batteries, fuel cells, solar cells etc. Nanostructured spinels further have high and wide scope of potential applications. In the present study, two different types of varied sized ferrimagnetic lithium ferrite spinel nanoparticles prepared using chemical sol-gel auto-combustion method were chosen. The prepared spinel particles were heated at 300°C for 1h. After heating the powders were milled using a High Energy Ball Mill for 30 minutes to further grind the particles and then subjected to various characterizations. Structural characterization was done using X-Ray Diffraction Method (XRD). The study revealed the spinel structure of these samples. Structural parameter such as lattice constant was determined using XRD data and found that the lattice parameter agrees with the standard data. DLS study found the agglomerations of the nanoparticles. The synthesized nanospinel particles were also characterized by the UVVis Spectroscopy, the Fourier Transform Infrared Spectroscopy (FTIR). Finally the magnetic hysteresis properties were studied using a Vibrating Sample Magnetometer (VSM)
Study of Measurement of luminescence life time of the Nd3+ ions in the 6-FDA/...IJERA Editor
Luminescence life time measurements of the Nd3+ ions in the 6-FDA/UVR and Al2o3 hosts were performed
using a Laser diode emitting at 800nm as the excitation source. Optical losses in both materials have been
studied and compared absorption bands of Nd3+
have been observed at 580nm ,745nm, 800nm and 870nm .
Based on which Judd- ofelt analysis has been applied to study the transition properties of Nd3+ ions in the two
hosts. Photoluminescence spectra of Nd3+ have been experimentally studied and emission around 880nm,
1060nm and 1330nm is observed, which indicates that Nd3+ ions are active in these two hosts.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Theoretical work submitted to the Journal should be original in its motivation or modeling structure. Empirical analysis should be based on a theoretical framework and should be capable of replication. It is expected that all materials required for replication (including computer programs and data sets) should be available upon request to the authors.
Synthesis and Structural Characterization of Cu Substituted Ni-Zn Nano-Ferrit...IJERA Editor
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1. International Journal of Computer Science, Engineering and Applications (IJCSEA) Vol.4, No.3, June 2014
DOI : 10.5121/ijcsea.2014.4304 41
ISOTROPY OF INTERMETALLIC
COMPOUNDS
Assoc. Prof. Dr. Fae`q A. A. Radwan
Faculty of Engineering - Near East University
KKTC – Lefkosa: P.O. Box: 670
Mersin 10 , Turkey
ABSTRACT:
The norm of elastic constant tensor and the norms of the irreducible parts of the elastic constants of
Intermetallic compounds are calculated. The relation of the scalar parts norm and the other parts norms
and the anisotropy of these compounds are presented. The norm ratios are used to study anisotropy of
these compounds.
Index Terms –Intermetallic Compounds Isotropy, Norm, Anisotropy, and Elastic Constants.
1. INTRODUCTION
The decomposition procedure and the decomposition of elastic constant tensor is given in
[1,2,3,4,5,6] , also the definition of norm concept and the norm ratios and the relationship
between the anisotropy and the norm ratios are given in [3,4,5,6]. As the ratio becomes close to
one the material becomes more isotropic, and as the ratio becomes close to one the material
becomes more anisotropic as explained in [3,4,5,6] .
2. CALCULATİONS
Table 1, Elastic Constants (GPa), [7]
Cubic System, Intermetallic Compounds 11
c 44
c 12
c
CaAl2 97.0 36.6 22.4
CoPt 290 124 178
Cu3Au 191 66.3 138
CuAuZn2 136 52.9 130
GdAl2 160.5 59.5 36.8
3. International Journal of Computer Science, Engineering and Applications (IJCSEA) Vol.4, No.3, June 2014
43
Table 2, the norms and norm ratios
By using table 1, and the decomposition of the elastic constant tensor [1,2,3,4,5,6], we have
calculated the norms and the norm ratios as is shown in table 2.
Cubic System,
Intermetallic
Compounds
s
N d
N n
N N
N
Ns
N
Nd
N
Nn
UCd11 203.521 0 0.6416 203.522 1.0000 0 0.0032
CaAl2 187.266 0 1.2831 187.271 1.0000 0 0.0069
GdAl2 308.198 0 4.3076 308.228 0.9999 0 0.0140
PrAl2 269.719 0 5.3158 269.771 0.9998 0 0.0197
NdAl2 277.467 0 7.6987 277.574 0.9996 0 0.0277
Mg2Sn 168.233 0 10.632 168.568 0.9980 0 0.0631
UCO2 510.172 0 35.561 511.409 0.9976 0 0.0695
YAl2 313.152 0 22.363 313.949 0.9975 0 0.0712
Mg2Pb 149.474 0 11.181 149.892 0.9972 0 0.0746
HfCO2 569.207 0 43.993 570.905 0.9970 0 0.0771
TbAl2 296.241 0 22.913 297.126 0.9970 0 0.0771
ZrCO2 520.841 0 43.443 522.65 0.9965 0 0.0831
LaAl2 261.976 0 23.554 263.033 0.9960 0 0.0895
MgCu2 288.844 0 27.495 290.150 0.9955 0 0.0948
Nb3Sn 508.342 0 57.557 511.590 0.9937 0 0.1125
AuGa2 258.806 0 30.245 260.568 0.9932 0 0.1161
Cu3Au 495.993 0 72.955 501.329 0.9894 0 0.1455
CoPt 721.380 0 124.650 732.069 0.9854 0 0.1703
YZn 225.120 0 42.343 229.068 0.9828 0 0.1848
Ni3Fe (73.8 at 555.162 0 111.810 566.310 0.9803 0 0.1974
4. International Journal of Computer Science, Engineering and Applications (IJCSEA) Vol.4, No.3, June 2014
44
%Ni)
AuZn (47 at %
Zn) 405.609 0 84.319 414.28 0.9791 0 0.2035
AuZn (50 at %
Zn) 411.885 0 85.694 420.705 0.9790 0 0.2037
CuAuZn2 410.794 0 91.468 420.854 0.9761 0 0.2173
LiIn 152.700 0 35.927 156.869 0.9734 0 0.2290
AgMg 226.710 0 62.140 235.072 0.9644 0 0.2643
NiAl 559.666 0 170.470 585.053 0.9566 0 0.2914
Ni3Al 454.707 0 148.480 478.334 0.9506 0 0.3104
3. CONCLUSION
By examining the results which are given in table 2, we can conclude by considering the ratio
that the compound UCd11 is the most isotropic compound (because the value of in the case of
UCd11 is more small than that in the case of CaAl2), and the most anisotropic Intermetallic
compound is Ni3Al because the value of is the smallest and value of is the largest for Ni3Al,
and also we can notice that in the case of the Intermetallic compounds (CaAl2, GdAl2, PrAl2,
NdAl2, YAl2, TbAl2, and LaAl2) which every one of them contain two atoms of Aluminium,
Al, the most isotropic compound is CaAl2 and LaAl2 is the most anisotropic compound, and also
we can notice that in case of the compounds, AuZn (47 at % Zn), and AuZn (50 at % Zn), the
former one with less % Zn is more isotropic, and also we can notice that the Intermetallic
compound UCO2 is the most isotropic compound of the compounds (UCO2, HfCO2, and
ZrCO2) where ZrCO2 is the most anisotropic compound, also we can notice by considering the
value of we found that this value is the highest (721.380) in the case of the Intermetallic
compound CoPt so we can say that the Intermetallic compound CoPt elastically is the strongest,
and the in the case of Mg2Pb (149.474) the value of is the smallest so we can say that the
Intermetallic compound Mg2Pb elastically is the least strong compound.
5. International Journal of Computer Science, Engineering and Applications (IJCSEA) Vol.4, No.3, June 2014
45
REFERENCES
[1] Jerphagnon, J., Chemla, D. S., and Bonnevile, R., (1978), "The Description of Condensed Matter
Using Irreducible Tensors", Adv. Phys, 11, p1003-1017.
[2] Radwan, Fae'q A. A. (1999), " Norm Ratios and Anisotropy Degree", The First International
Conference in Mathematical Sciences, Applied Mathematics, ICM99, November 1999, United Arab
Emirates University, Al Ain, United Arab Emirates. Pak. J. Appl. Sci..Vol. 1, (3): 301-304, 2001.
[3] F. A. A. Radwan, 'Scalar Irreducible Parts of Sixth Rank Tensor', Arab Gulf Journal of Scientific
Research, 19 (3), Pp163-166, (2001).
[4] Fae`q A. A. Radwan, ' Some Properties of Copper - Gold and Silver - Gold Alloys at Different % of
Gold', Journal: Lecture Notes in Engineering and Computer Science Year: 2011, Vol 2189, Issue: 1,
pp1221-1224.
[5] Fae`q A. A. Radwan, ' Isotropy of Some Types of Bones`, International Journal of Engineering
Science and Technology (IJEST), Vol. 3 No. 4 April 2011: 3382-3386.
[6] Fae’q A. A. Radwan, ‘Some properties of copper-nickel at different % of Ni’, Pelagia Research
Library, Der Chemica Sinica, 2014, 5(1):34-38.
[7] Landolt-Börnstein, Group III, "Crystal and Solid State Physics", Volume, 11, Springer-Verlag.