Sri Lankan Journal of Physics最新文献_第8页

Comparison of RegCM3 simulated meteorological parameters in Bangladesh: Part I-preliminary result for rainfall 孟加拉国RegCM3模拟气象参数的比较:第一部分降雨的初步结果

Sri Lankan Journal of Physics Pub Date : 2007-11-11 DOI: 10.4038/SLJP.V8I0.209

Mizanur Rahman, N. Islam, Ahsan Ahmed, Romee Afroz

引用次数: 14

Effect of sputtering conditions on the gas sensitivity of copper oxide thin films 溅射条件对氧化铜薄膜气敏性的影响

Sri Lankan Journal of Physics Pub Date : 2007-11-11 DOI: 10.4038/SLJP.V8I0.210

P. Samarasekara, N. Yapa

引用次数: 11

Optical properties of Poly-[2-methoxy-5-(2-ethyl-hexyloxy)-phenylene vinylene and its application in photovoltaic cells 聚[2-甲氧基-5-(2-乙基-己氧基)-苯基-乙烯烯的光学性质及其在光伏电池中的应用

Sri Lankan Journal of Physics Pub Date : 2007-11-11 DOI: 10.4038/SLJP.V8I0.211

P. Sirimanne, E. Premalal

引用次数: 9

Efficient quasi-solid dye sensitized solar cells employing molten salt electrolyte 采用熔盐电解质的高效准固体染料敏化太阳能电池

Sri Lankan Journal of Physics Pub Date : 2006-12-11 DOI: 10.4038/SLJP.V7I0.204

G. Senadeera, N. D. Silva

引用次数: 2

Effect of Cathode thickness on the performance of the cell Li/ PAN:EC:PC:LiCF 3 SO 3 /PPy:DBS 阴极厚度对锂/ PAN:EC:PC: licf3 / so3 /PPy:DBS电池性能的影响

Sri Lankan Journal of Physics Pub Date : 2006-12-11 DOI: 10.4038/SLJP.V7I0.206

K. Vidanapathirana, M. Careem

引用次数: 3

Conductivity variation of the liquid electrolyte, EC : PC : LiCF3SO3 with salt concentration 电解质EC: PC: LiCF3SO3电导率随盐浓度的变化

Sri Lankan Journal of Physics Pub Date : 2006-12-11 DOI: 10.4038/SLJP.V7I0.202

M. Dissanayake

{"title":"Conductivity variation of the liquid electrolyte, EC : PC : LiCF3SO3 with salt concentration","authors":"M. Dissanayake","doi":"10.4038/SLJP.V7I0.202","DOIUrl":"https://doi.org/10.4038/SLJP.V7I0.202","url":null,"abstract":"It is a well known fact that liquid electrolytes inherit better conductivity values than other electrolytes such as solid electrolytes and polymer electrolytes. Basically, a liquid electrolyte consists of a salt dissolved in a solvent or a mixture of solvents. Their conductivity values therefore depend on the salt concentration as well as solvent concentration. Present study is based on the liquid electrolyte, ethylene carbonate (EC), propylene carbonate (PC) and lithium trifluoromethane sulfonate (LiCF 3 SO 3 – LiTF). Its conductivity variation with the salt concentration was investigated using AC impedance spectroscopy. The maximum conductivity observed at room temperature (RT) was 2.80 x 10 -3 S cm -1 at the salt concentration of 0.85 mol kg -1 . To explore the reasons governing the conductivity below and above that salt concentration, viscosity measurements were done using a Ostwalds viscometer. Upto the salt concentration of 0.85 mol kg -1 , conductivity increases. Hence, it can be assumed that due to the increment of charge carrier concentration with salt concentration, conductivity increases upto 0.85 mol kg -1 . After that, the effect of viscosity may dominate resulting in conductivity reduction. According to the observations, with the salt concentration, viscosity increased. The carrier mobility and hence, the conductivity decrease with viscosity. Conductivity variation with temperature of all samples followed the Vogel Tamman Fulcher (VTF) behaviour.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81421626","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: 17

Energy absorption by the human body from RF and microwave emissions in Sri Lanka 斯里兰卡人体从射频和微波辐射中吸收的能量

Sri Lankan Journal of Physics Pub Date : 2006-12-11 DOI: 10.4038/SLJP.V7I0.207

M. Karunarathna, Lj Dayawansa

{"title":"Energy absorption by the human body from RF and microwave emissions in Sri Lanka","authors":"M. Karunarathna, Lj Dayawansa","doi":"10.4038/SLJP.V7I0.207","DOIUrl":"https://doi.org/10.4038/SLJP.V7I0.207","url":null,"abstract":"This paper presents the computed Specific Absorption Rate (SAR) in the human eye using measured field strengths from RF signals radiated by FM radio, TV and mobile cellular base stations operating in the 900 MHz band, in different parts of Sri Lanka. The SAR values in the eye are well below the internationally recognized FCC standards on human exposure to RF radiation. Calculations were carried out using the Finite Difference Time Domain (FDTD) method. The estimated SAR distribution in some organs of the human body due to exposure from signals of frequencies ranging from 100 MHz to 2500 MHz, based on an incident field of strength 1 V/m, are also presented. Some of the most vital organs of the human body, the eye, the testis, the brain and the kidney, have been examined. Results indicate that in all the organs investigated except in the testis, the maximum SAR increases with increasing frequency. Among the four organs the highest SAR of value 0.308 W/kg is in the eye and it occur at the highest frequency. The SAR distribution in the eye shows that beyond 900 MHz its maximum value shifts towards the interior of the eye and at 2500 MHz it is almost at the centre of the eye. In the kidney, at low frequencies, the highest SAR is at the front layers and it gets shifted to the centre of the kidney at 900 MHz and beyond this frequency the peak SAR shifts towards the interior. SAR values inside the four vital human body organs analyzed in this paper are below FCC standards and therefore at present we are safe.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85853534","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: 27

Variation of flatband potential of oxide nanocrystalline particles with core-shell structured semiconductor-MgO composites 氧化纳米晶粒子与核壳结构半导体-氧化镁复合材料的平带电位变化

Sri Lankan Journal of Physics Pub Date : 2006-12-11 DOI: 10.4038/SLJP.V7I0.205

J. Bandara, U. W. Pradeep

引用次数: 4

Fabrication and characterization of Bi1.6Pb0.4Sr2Ca2Cu3Oy superconductors prepared by solid state reaction technique 固相反应制备Bi1.6Pb0.4Sr2Ca2Cu3Oy超导体及其表征

Sri Lankan Journal of Physics Pub Date : 2006-12-11 DOI: 10.4038/SLJP.V7I0.203

P. Fernando, N. Pathmanathan

{"title":"Fabrication and characterization of Bi1.6Pb0.4Sr2Ca2Cu3Oy superconductors prepared by solid state reaction technique","authors":"P. Fernando, N. Pathmanathan","doi":"10.4038/SLJP.V7I0.203","DOIUrl":"https://doi.org/10.4038/SLJP.V7I0.203","url":null,"abstract":"In this work three sets of superconducting samples with composition Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O y were prepared by the solid state techniques and resistivity measurements were carried out on these samples in the temperature range 77 K – 175 K. The standard four-probe technique was used to measure the resistivity of the samples. The appropriate amount of Bi 2 O 3 , PbO, SrCO 3 , CaCO 3 and CuO of 99.99 % purity were used as starting raw material and were mixed. The mixed powder was initially calcinated at constant temperature of 820 0 C and the pallets of diameter 14 mm and thickness 1-2mm were prepared under the pressures 200 kg/cm 2 (sample A), 300 kg/cm 2 (sample B) and 250 kg/cm 2 (sample C). Then the pallets were subjected to several cycles of sintering at constant temperature in the furnace and allowed to furnace cool to room temperature in air. The resistivity measurements were carried out on these samples using locally made resistivity probe. Rh-Fe resistance thermometer was used to measure the temperatures of the sample. The samples A, B and C showed the onset superconducting transition temperatures at 103 K, 111 K, and 110 K respectively. Samples A and B showed broad transitions while sample C showed a sharp drop indicating the presence of only one superconducting phase Bi 2223 in the sample.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76307133","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

Trends of Rainfall in Sri Lanka over the Last Century 斯里兰卡上个世纪的降雨趋势

Sri Lankan Journal of Physics Pub Date : 2005-12-15 DOI: 10.4038/SLJP.V6I0.197

Hkwi Jayawardene, D. Sonnadara, Jayewardene

引用次数: 85