IOSR Journal of Applied Physics最新文献_第8页

Variation of Bulk and Particle Thermal Properties of Some Selected Wood Materials for Solar Device Applications 一些选定的太阳能器件用木质材料的体积和颗粒热性能的变化

IOSR Journal of Applied Physics Pub Date : 2017-05-01 DOI: 10.9790/4861-0903011417

S. Oluyamo, T. M. Aramide, Mathew Adefusika Adekoya, O. Famutimi

{"title":"Variation of Bulk and Particle Thermal Properties of Some Selected Wood Materials for Solar Device Applications","authors":"S. Oluyamo, T. M. Aramide, Mathew Adefusika Adekoya, O. Famutimi","doi":"10.9790/4861-0903011417","DOIUrl":"https://doi.org/10.9790/4861-0903011417","url":null,"abstract":"The study examines the variation of thermal properties of bulk and particle of three different wood species: Pterygota macrocarpa, Milicia excelsa and Celtis philippensis of the families of Sterculiaceae, Moraceae and Ulmaceae. The particle samples were moulded to appropriate disc shape using modified hydraulic press mould while the bulk samples were turn into disc shape using circular saw machine. The results showed that thermal conductivity of the selected wood materials changed with particle sizes. Bulk samples have higher thermal conductivity values than the particles for all the wood species. Among the particle sizes, 300 μm has the highest thermal conductivity value compared with 600 μm and 850 μm respectively. It was established in the research that the thermal conductivity of wood materials in the study ranged between 0.0855 -0.3150 Wm -1 K -1 for particle sizes and 0.2130-0.4298Wm -1 K -1 for bulk samples. The wood samples for the specific particle sizes exhibit low thermal conductivity that is comparable with materials used as industrial insulators. Within the limit of this research, all the particle sizes considered potent better thermal insulators compared with bulk wood materials.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"96 1","pages":"14-17"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75009183","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: 3

Do First Year College Female and Male Students Hold Different Misconceptions about Force and Motion 大一女生和男生对力和运动有不同的误解吗

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902021418

H. Salameh, M. Nuseirat, K. Alkofahi

引用次数: 2

Nuclear Science And Techniques 核科学与技术

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902015458

K. Chatterjee

{"title":"Nuclear Science And Techniques","authors":"K. Chatterjee","doi":"10.9790/4861-0902015458","DOIUrl":"https://doi.org/10.9790/4861-0902015458","url":null,"abstract":"With the appearance of knowledge mankind began to research about the existence of atom and where magical force ruled the minds of the people and all universes. If I ask one question, how much break of piece of matter in half and then break it in half again, how many breaks will be we have to make before we can break it no further ? Somebody thought it ended at same point , a smallest possible bit of matter and that is called basic matter particles atoms. Fundamentally the mystery of creation have been hidden in the high energy collision and the most powerful constructed engine is human structure, that which demonstrated powerful of telepathy. Power of far seeing etc. Scientist are going to break again break a piece of matter and philosophers are going to research to the cause of matter. The purpose of them is same but different way. The finest position of matter is only shapeless object, that is called great imagination, which have not visual but realized By sensibility. The mystery of creation have related within sexual connection of animal world, which have signed in the name of collision from another angle of vision, great existence means ----enlightened frame of mind and expression , which have existed and expanded that is truth. Human body is the best performer than of all others which have been provided by infinite energy which have out of thoughts of mind.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"1 1","pages":"54-58"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89735413","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

Determination of Concentrations of Natural Radionuclides in Soils and Water in Non-cultivated Sites in Seberang Perai, Malaysia 马来西亚威州非耕地土壤和水中天然放射性核素浓度的测定

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902022735

N. A. Alnassar, M. Jaafar, N. Kabir

{"title":"Determination of Concentrations of Natural Radionuclides in Soils and Water in Non-cultivated Sites in Seberang Perai, Malaysia","authors":"N. A. Alnassar, M. Jaafar, N. Kabir","doi":"10.9790/4861-0902022735","DOIUrl":"https://doi.org/10.9790/4861-0902022735","url":null,"abstract":"The purpose of this study is to evaluate the level of concentration of radionuclides in Non-cultivated soils and water, which are taken from Seberang Perai in Penang, Malaysia. The concentrations of natural radioactive nuclides; 226 Ra, 232 Th, and 40 K were assessed using HPGe detector. The concentrations of 226 Ra, 232 Th, and 40 K in soil samples are 4.98 to 160.09, 3.43 to 233.59 and from 56.40 to 819.63 Bq kg -1 respectively. The mean concentrations of 226 Ra, 232 Th, and 40 K are 36.00, 44.21 and 254.60 Bq kg -1 respectively. Similarly, the concentrations of 226 Ra, 232 Th, and 40 K in water samples were assessed to be from 0.19 to 2.13 (mean=1.07), 1.15 to 4.32 (mean = 3.08 ) and from 92.37 to 172.43 (mean = 132.43)Bq l -1 respectively. The outcomes using Pearson’s correlation shows that the relationship of concentrations of 226 Ra, 232 Th and 40 K amongst soil and water for the researched samples are R=0.85, R=0.91 and R= 0.75 correspondingly with p< 0.05. Statistical analysis using T-test showed significant distinction between concentrations of 226 Ra, 232 Th and 40 K in soil and water with t values equal to 3.92, 3.12, and 2.57 respectively at p < 0.05. The results clearly show the values of concentrations of these radionuclides are at the allowable levels with corresponding with dose assessment and radiological indexes.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"27 1 1","pages":"27-35"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77231169","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: 4

Fibonacci Quasiperiodic Multilayers with Internal Symmetry 具有内对称的斐波那契拟周期多层

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902015963

J. P. Pandey

引用次数: 5

Synthesis and Characterization of La0.8Sr0.1Ag0.1MnO3 Nano Perovskite Compound La0.8Sr0.1Ag0.1MnO3纳米钙钛矿化合物的合成与表征

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902024245

Abd El-Rahman T. AboZied, A. A. Ghani, Ahmed I. Ali, T. S. El-Din

引用次数: 0

Growth and Characterisation of new Semi Organic Crystal Bisthiourea Calciumacetate 新型半有机双硫脲醋酸钙晶体的生长与表征

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902016975

P. Veluchamy

引用次数: 1

Electrical Simulation of Organic Solar Cell at Different Charge Carrier Mobility 不同载流子迁移率下有机太阳能电池的电学模拟

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902020104

Narender Singh, A. Chaudhary, S. Saxena, M. Saxena, N. Rastogi

引用次数: 14

Understanding the Ultimate Structure of Matters and Some Scientific Doubts of Nature through Simple Hypotheses 从简单的假设认识物质的终极结构和对自然的一些科学疑问

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902016468

B. Zong

{"title":"Understanding the Ultimate Structure of Matters and Some Scientific Doubts of Nature through Simple Hypotheses","authors":"B. Zong","doi":"10.9790/4861-0902016468","DOIUrl":"https://doi.org/10.9790/4861-0902016468","url":null,"abstract":"There are numerous unanswered scientific doubts/phenomena in Nature which still perplex scientific researchers currently. To solve these puzzles, unveiling the ultimate structure of matters, which make up the Nature world, is essential. Here four hypotheses, namely the fundamental matter component (basic particle) and its property, construction process of the basic particles into other particles/matters, repulsion of particles of the same type, and direct relationship between matter and energy, are proposed. These simple hypotheses can well explain some natural phenomena, such as the existence of huge atom energy and various particles/matters of different properties, and conversion balance between matters and energy. Due to the existence of diverse infinite fine particles and repulsion of particles of the same types, matters and the Nature world are submerged in a sea of particles and there is not a real vacuum space (without any particle) in the Nature world. This in turn reveals Thermal Laws, the component of dark energy/matter, as well as a minimum temperature of ~3K that exists in the deep Universe. The suggested relationships between particles and/or matters also shed light on the mechanisms of interaction forces of same or different polarity particles, and intermedia of gravitational, electrical and magnetic fields.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"2 1","pages":"64-68"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88903266","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

Structural and Electrical properties of Thermally Evaporated Nanostructured CuInSe Thin Films 热蒸发纳米结构铟硒薄膜的结构和电学性能

IOSR Journal of Applied Physics Pub Date : 2017-04-01 DOI: 10.9790/4861-0902021926

A. Jain, Y. Toda, D. Gujarathi

{"title":"Structural and Electrical properties of Thermally Evaporated Nanostructured CuInSe Thin Films","authors":"A. Jain, Y. Toda, D. Gujarathi","doi":"10.9790/4861-0902021926","DOIUrl":"https://doi.org/10.9790/4861-0902021926","url":null,"abstract":"Nano structured thin films having different thickness of CuInSe were deposited by thermal evaporation techniques, onto precleaned amorphous glass substrate at room temperature. The structural properties of films were evaluated by XRD, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The quantitative analysis was done by Energy Dispersive Analysis for x-ray to determine atomic % of the material used. The electrical transport properties of as deposited thin films have been evaluated by using four probe resistivity set up. Resistivity (3.108 X 10 -5 ohm cm), activation energy (0.00396 – 0.0752 eV), carrier concentration (1.30 X 10 18 /cm3), mobility (1.53 X 10 4 cm 2 / V-s) has been estimated. Thermo Electrical parameters such as Fermi energy (0.025 to 0.461 eV), absorption coefficient (0.0042 to 0.067) have been estimated. The x-ray diffraction analysis confirms that films are polycrystalline in nature having cubic structure with a preferential orientation along the (300) plane. The degree of such a preferred orientation was found to increase with film thickness. The lattice parameters (a = 11.53 Å) and crystallite size (D) were calculated and found to be 16.21 nm. The dislocation density, the number of crystallites per unit area (N) and the strain (ε) of the films were determined. SEM investigation confirms that nano size grains were distributed almost uniformly over smooth substrate and particles were granular in nature. Large grains on top of dense bottom films were observed. The nano grains forms cluster by fusing to each other. The size of clusters was found approximately 48.04 nm to 235.05 nm.","PeriodicalId":14502,"journal":{"name":"IOSR Journal of Applied Physics","volume":"32 1","pages":"19-26"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76900989","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