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IOSR Journal of Applied Physics最新文献

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THERMAL NOISE ANALYSIS OF SWITCHED CAPACITOR NETWORKS 开关电容网络热噪声分析
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903011113
S. Pan
{"title":"THERMAL NOISE ANALYSIS OF SWITCHED CAPACITOR NETWORKS","authors":"S. Pan","doi":"10.9790/4861-0903011113","DOIUrl":"https://doi.org/10.9790/4861-0903011113","url":null,"abstract":"Thermal noise is one of the most important challenges in analogue intergrated circuits design. This problem is more critical in switched capacitor (Sc) filters due to the aliasing effect of wide band thermal noise. In these circuits, switching introduces a boost in the power spectral density of the thermal noise due to aliasing. Unfortunately, even though the theory of noise in Sc circuits is discussed in the literature, it is very tedious and requires highly sophisticated and not widely available software. The purpose of this paper is twofold. It provides a tutorial description of the physical phenomena taking place in anSc circuit while it processes noise. It also proposes some specialized but highly efficient algorithms for estimating the resulting sampled noise in Sc circuits, which need only simple calculations. A practical design procedure, which follows directly from the estimate, is also described. The accuracy of the proposed estimation algorithms is verified by simulation using spectre RF. As an example, it is applied to the estimation of the total thermal noise in a second order lowdistortion delta sigma converter.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"141 1","pages":"11-13"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89774051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Piezoelectricity in PVDF and PVDF Based Piezoelectric Nanogenerator: A Concept PVDF的压电性和基于PVDF的压电纳米发电机:一个概念
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903019599
Binoy Bera, M. Sarkar
{"title":"Piezoelectricity in PVDF and PVDF Based Piezoelectric Nanogenerator: A Concept","authors":"Binoy Bera, M. Sarkar","doi":"10.9790/4861-0903019599","DOIUrl":"https://doi.org/10.9790/4861-0903019599","url":null,"abstract":"Polyvinylidene fluoride or simply PVDF is one of the most important semicrystalline polymers which generate piezoelectricity when a pressure or mechanical force applied on it. It has four crystalline phases α, β, ɣ and δ depending on the chain conformation structure. Among them α is non polar phase and β and ɣ are polar phase. Piezoelectricity in PVDF arises due to the β and ɣ phase formation. Several materials have been introduced for the preparation of nanogenerator. Among them PVDF (polyvinylidene fluoride) is most interesting material used in nanogenerator preparation due to its flexibility, biocompatiable, nontoxic in nature. It is used in nanogenerator application due to its good ferroelectric, piezoelectric and pyroelectric properties. In this article we describe little bit concept about PVDF, its piezoelectricity and PVDF based nanogenerator. Application of piezoelectric nanogenerator is also briefly described here.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"54 1","pages":"95-99"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91145003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 47
Preparation and Characterization of (PVA+ZnO) Polymer Films Doped With Cu2+ Ions Cu2+离子掺杂(PVA+ZnO)聚合物薄膜的制备与表征
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903011824
C. Rani, S. Bindu, M. Hemalatha, C. Raju
{"title":"Preparation and Characterization of (PVA+ZnO) Polymer Films Doped With Cu2+ Ions","authors":"C. Rani, S. Bindu, M. Hemalatha, C. Raju","doi":"10.9790/4861-0903011824","DOIUrl":"https://doi.org/10.9790/4861-0903011824","url":null,"abstract":"5 mol% (PVA+ZnO): (x mol%) Cu ions doped polymer films were prepared by solution casting technique. The obtained films are analyzed using different characterization techniques like SEM, FTIR, optical and EPR. The SEM micrographs shows the improvement in the crystallinity of the Cu 2+ doped PVAZn polymer films compared with the pure PVAZn film. The Fourier transform infrared spectroscopy (FTIR) spectrum shows a characteristic peaks of C-H, C=C, CH2 and C-O bonds. The optical absorption spectrum exhibits broad bands at 412 nm and 692 nm, which were corresponds to the 2 B1g → 2 Eg and 2 B1g → 2 B2g transition. The EPR spectra of all the polymer samples exhibits resonance signals characteristic of Cu 2+ ions. The spin-Hamiltonian parameter indicate that the ground state of Cu 2+ ions is dx 2 y 2 and the site symmetry around Cu 2+ ions is tetragonally distorted octahedral site. The number of spins participating in resonance (N) and paramagnetic susceptibility () were calculated from the EPR data for various concentrations of Cu ions.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"21 12 1","pages":"18-24"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82910992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Efficient Single Axis Sun Tracker Design for Photovoltaic System Applications 光伏系统应用的高效单轴太阳跟踪器设计
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0902025360
H. Akbar, Muayyad N. Fathallah, O. Raoof
{"title":"Efficient Single Axis Sun Tracker Design for Photovoltaic System Applications","authors":"H. Akbar, Muayyad N. Fathallah, O. Raoof","doi":"10.9790/4861-0902025360","DOIUrl":"https://doi.org/10.9790/4861-0902025360","url":null,"abstract":": Solar energy is rapidly gaining importance as a source of renewable energies. Solar tracker system enables be generated more solar energy by using photovoltaic solar cells. The degree of use the solar radiation can be maximized by use of tracker system which can increase the enough efficiency. It receives the largest amount of solar radiation incident when it is perpendicular to the solar panel. In this paper a one axis solar tracker is designed and implemented to track the sun in azimuth axis by using an AVR microcontroller. The implemented system consists mainly of the ATmega328 controller, DC motor, light sensors, relay and solar panel. The results show that the designed low cost sun tracker increases the output power gain by 18-25% as compared with the fixed panel located at a latitude angel (35.47°) of the Kirkuk city, Iraq. To increase the amount of incident efficiency of solar radiation conversion from the panels of the sun tracker systems has been changed by adding rear panel (back side) which is opposite to the in front panel and it was shows that the efficiency of the output power increasing about (65%) compared with fixed panel and when adding the reflector made of Aluminum foil as (a mirror) to the opposite panel (rear panel) the output power increased about (72%) compared to fixed system. The overall power gains on our tracker system increased and become more efficient by adding rear side panel and reflector.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"8 1","pages":"53-60"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75886571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Some Structural and Optical Properties of sprayed Iron Oxide Thin films 喷涂氧化铁薄膜的结构和光学性能
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0902024652
I. Tomsah
{"title":"Some Structural and Optical Properties of sprayed Iron Oxide Thin films","authors":"I. Tomsah","doi":"10.9790/4861-0902024652","DOIUrl":"https://doi.org/10.9790/4861-0902024652","url":null,"abstract":"In this paper α-Fe2O3, thin films were prepared by spray pyrolysis technique via spraying FeCl3·6H2O (10 -2 M) based aqueous solution with a spray flow of 8 ml/min onto heated glass substrates at 350 °C. After deposition, rust red and amorphous films was obtained. After a heat treatment at 400 ° C for six hours, the thin films are well crystallized. In order to study the surface morphology of the films and their crystalline structure, an electron scanning microscope (SEM) and X-ray diffraction were used (XRD). A UV-Vis-NIR spectrophotometer in the wavelength range 200–2500 nm was used to carry out the transmittance and the reflectance of the iron oxide films. The study of the optical properties of the iron oxide thin films was completed by the data acquired using a variable angle spectroscopic ellipsometer in the range 400–1800 nm of wavelength. The results reveal that the sprayed thin films were amorphous and after the heat treatment, the films crystallize in the α-Fe2O3 phase. SEM images show compact and homogeneous films, the estimated optical band gap for allowed direct transition of the iron oxide films was found to be 2.15 eV. On the other hand, the calculated thickness of the films from ellipsometry modeling is about 710 nm.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"326 1","pages":"46-52"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73137839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New Idea on Exact Solution of the Non Relativistic Schroedinger Equation for a Sextic Potential 非相对论性薛定谔方程在性势下精确解的新思想
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903019294
V. Srivastava, S. Bose
{"title":"New Idea on Exact Solution of the Non Relativistic Schroedinger Equation for a Sextic Potential","authors":"V. Srivastava, S. Bose","doi":"10.9790/4861-0903019294","DOIUrl":"https://doi.org/10.9790/4861-0903019294","url":null,"abstract":"Abstract: A useful generalization of an ansatz used to solve non relativistic Schroedinger equation for sextic potential of physical interest such that we obtain a class containing an infinite number of exact solutions for the given potential of physical importance. The exact solution may be used to get the accuracy and the reliability of numerical methods of solving Schroedinger equation.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"29 24","pages":"19-24"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91446738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Explanation of Expansion of Universe On The Basis Of Theory of Relativity and Consideration of Multiverse and Anti Gravity 基于相对论的宇宙膨胀解释及对多元宇宙和反重力的思考
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903020407
R. Mishra
{"title":"Explanation of Expansion of Universe On The Basis Of Theory of Relativity and Consideration of Multiverse and Anti Gravity","authors":"R. Mishra","doi":"10.9790/4861-0903020407","DOIUrl":"https://doi.org/10.9790/4861-0903020407","url":null,"abstract":"","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"18 1","pages":"04-07"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75518868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Varying Gravitational Constant under Special Case 特殊情况下的变重力常数
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903021516
Nikhil A. Khomane, Gaurav V. Kolhe
{"title":"Varying Gravitational Constant under Special Case","authors":"Nikhil A. Khomane, Gaurav V. Kolhe","doi":"10.9790/4861-0903021516","DOIUrl":"https://doi.org/10.9790/4861-0903021516","url":null,"abstract":"In this paper I worked on the special case for studying the behavior of the universal gravitational constant by merging both Newtonian and relativistic mechanics. By that certain case I found that the value of the gravitational constant i.e. 6.67x N / is not actually a constant but vary with some conditions and reaches to zero at the speed of light. Keyword: Force, Lorentz transformation, Photon, Special relativity, speed of light, etc.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"23 1","pages":"15-16"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77506802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetohydrodynamic Boundary Layer Slip Flow and Heat Transfer over a Flat Plate with Heat Generation/Absorption and Viscous Dissipation 具有吸热和粘滞耗散的平板磁流体边界层滑移流动和传热
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-090301100110
O. Onyejekwe
{"title":"Magnetohydrodynamic Boundary Layer Slip Flow and Heat Transfer over a Flat Plate with Heat Generation/Absorption and Viscous Dissipation","authors":"O. Onyejekwe","doi":"10.9790/4861-090301100110","DOIUrl":"https://doi.org/10.9790/4861-090301100110","url":null,"abstract":"A numerical study has been carried out on the momentum and heat transfer characteristics of an incompressible magnetohydrodynamic boundary layer slip flow over a flat plate with both viscous and ohmic dissipations. Momentum boundary layer equation takes care of the magnetic field while the ohmic and viscous dissipations are accounted for by the thermal boundary layer equation. The governing equations constitute highly non-linear momentum and thermal boundary layer equations. Both are converted into similarity equations before being solved by the Runge-Kutta-Fehlberg technique with shooting. The results are analyzed for both isothermal and non-isothermal boundary conditions for various combinations of flow and heat transfer parameters. Some of the important findings show that in the absence of both the magnetic and velocity slip parameters, the flow profiles are identical to those of Bhattacharyya et al. [1]. The combined effect of increasing both the magnetic and the slip velocity parameters significantly affects the velocity and the shear stress profiles. An increase of slip parameter results in a decrease in skin friction, whereas an increase in Eckart number enhances viscous dissipation and a consequential temperature rise especially at the boundary. Sometimes this may escalate to a level where a Dirichlet temperature specification is exceeded. Furthermore, the temperature gradient is highly sensitive to prescribed values of Prandtl number and heat generation parameter.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"09 1","pages":"100-110"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81366692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Growth, Characterization and Comparison of Zirconia-Graphite Ceramic Carbon Composites 氧化锆-石墨陶瓷碳复合材料的生长、表征和比较
IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903015458
V. Kumari, S. Rani, Dharvendra Singh
{"title":"Growth, Characterization and Comparison of Zirconia-Graphite Ceramic Carbon Composites","authors":"V. Kumari, S. Rani, Dharvendra Singh","doi":"10.9790/4861-0903015458","DOIUrl":"https://doi.org/10.9790/4861-0903015458","url":null,"abstract":"The density of ZrO2 ceramic carbon composites prepared by the conservative solid sintering technique is as close to any commercially available ZrO2. The Vicker's hardness as well as modulus of the sample with 1400°C high temperatures treated, is quite high compared to the lower 1200°C HTT samples. From S1 to S6 on comparison, it is found that porosity for S6 is minimum and maximum for S1. After comparing with ceramic monolith the flexural strength and modulus shows a remarkable improvement in its value. The average grain size measured from the width of the x-ray peaks, the information highlighted by x-ray diffractogram comes from a deeper level of the lattice. The optical micrograph shows the sample was uniform except for asperities arising due to leakage of pitch while carbonizing. The rest of the micrographs help in finding the grain size as well as the extent of infiltration of pitch into the system.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"08 1","pages":"54-58"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89713506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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