International Letters of Chemistry, Physics and Astronomy最新文献_第2页

A Facile Autoxidation of an Allylic Alcohol in Air 烯丙醇在空气中的快速自氧化作用

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.83.41

Fathia A. Mosa, A. Whiting

引用次数: 0

Effect on L4,5 in the ER3BP when Both Primaries are Radiating with Oblateness up to Zonal Harmonic J4 两原星以扁率辐射至纬向谐波J4时对ER3BP中L4、5的影响

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.83.1

J. Singh, Blessing Ashagwu

引用次数: 0

Equations of Motion in the Theory of Relativistic Vector Fields 相对论矢量场理论中的运动方程

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.83.12

Sergey G. Fedosin

引用次数: 6

Spatiotemporal Variability of Lightning Flash Distribution over Sri Lanka 斯里兰卡闪电分布的时空变异

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-03-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.82.1

U. Maduranga, M. Edirisinghe, L. Gamage

{"title":"Spatiotemporal Variability of Lightning Flash Distribution over Sri Lanka","authors":"U. Maduranga, M. Edirisinghe, L. Gamage","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.82.1","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.82.1","url":null,"abstract":"The variation of the lightning activities over Sri Lanka and surrounded costal belt (5.750N-10.000N and 79.50E-89.000E) is studied using lightning flash data of Lightning Imaging Sensor (LIS) which was launched in November 1997 for NASA’s Tropical Rainfall Measuring Mission (TRMM). The LIS data for the period of 1998 to 2014 are considered for this study. The spatial and temporal variation of lightning activities is investigated and respective results are presented. The diurnal variation over the studied area presents that maximum and minimum flash count recorded at 1530-1630 Local Time (10-11UTC) and 0530-0630LT (00-01UTC) respectively. Maximum lightning activities over the observed area have occurred after the 1330LT (08UTC) in every year during the considered time period. The seasonal variation of the lightning activities shows that the maximum lightning activities happened in First inter monsoon season (March to April) with 30.90% total lightning flashes and minimum lightning activities recorded in Northeast monsoon season (December to February) with 8.51% of total lightning flashes. Maximum flash density of 14.37fl km-2year-1 was observed at 6.980N/80.160E in First inter monsoon season. These seasonal lighting activities are agree with seasonal convective activities and temperature variation base on propagation of Intra-Tropical Convection Zone over the studied particular area. Mean monthly flash count presents a maximum in the month of April with 29.12% of lightning flashes. Variation pattern of number of lightning activities in month of April shows a tiny increment during the time period of 1998 to 2014. Maximum annual flash density of 28.09fl km-2yr-1 was observed at 6.980N/80.170E. The latitudinal variation of the lightning flash density is depicted that extreme lightning activities have happened at the southern part of the county and results show that there is a noticeable lack of lightning activities over the surrounded costal belt relatively landmass.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89359171","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

Imparting Protection against UV Radiations Using In Situ Coating of Titanium Dioxide on Textiles 二氧化钛在纺织品上的原位涂层对紫外线辐射的防护作用

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-03-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.82.14

A. Mishra, H. Mohapatra, B. S. Butola

{"title":"Imparting Protection against UV Radiations Using In Situ Coating of Titanium Dioxide on Textiles","authors":"A. Mishra, H. Mohapatra, B. S. Butola","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.82.14","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.82.14","url":null,"abstract":"Protection against ultraviolet radiation is one of the areas, in which considerable attention is being paid. Application of a wash durable finish on cotton fabric to protect the wearer from these radiations remains a challenge. The harmful effects of UV radiations result in the form of eye disorders, accelerated ageing of skin, DNA damage and cause of cancer. The current study focuses upon the use of TiO2 on cotton fabric to impart UV protection. TiO2 is deposited on cotton fabric using its pre-cursor. Sol-gel method has been used to convert pre-cursor into titanium oxide directly on fabric surface. The deposition was further stabilized on fabric surface by various heat treatments such as curing, hydrothermal and solvothermal treatments. It has been found that the TiO2 remains wash durable with a reasonably high degree of UV protection after hydrothermal and solvothermal treatments. EDX and ICP-MS techniques were used to examine the add-on % of TiO2 on cotton fabrics. The morphology of the TiO2 coated cotton fabric was studied using Field emission scanning electron microscopy. The measurement of UV protection property of the fabric has been carried out using UV-visible spectrophotometer (UV-2000F, Labsphere, USA).","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"116 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79783921","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

Quantum Transport Properties of Two-Dimensional Quantum Lattices under Synthetic Magnetic 合成磁作用下二维量子晶格的量子输运性质

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-03-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.82.21

Pubudu G. Wijesinghe, K. Gamalath

引用次数: 0

Morphological and Structural Properties of Porous Silicon (PSi) 多孔硅(PSi)的形态与结构特性

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-02-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.81.11

A. Kadhim, M. H. Alzubaidy, A. Abd

引用次数: 3

Interaction of Dyes with Cationic Surfactants in Solutions: Determination of Critical Micelle Concentration 染料与溶液中阳离子表面活性剂的相互作用:临界胶束浓度的测定

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-02-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.81.27

S. Shapovalov, V. Ponomariov

引用次数: 7

Photocatalytic Degradation of a Basic Dye Using Zinc Oxide Nanocatalyst 氧化锌纳米催化剂光催化降解碱性染料

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-02-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.81.18

M. Chijioke-Okere, N. J. Okorocha, Basil N. Anukam, Emeka Emanuel Oguzie

{"title":"Photocatalytic Degradation of a Basic Dye Using Zinc Oxide Nanocatalyst","authors":"M. Chijioke-Okere, N. J. Okorocha, Basil N. Anukam, Emeka Emanuel Oguzie","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.81.18","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.81.18","url":null,"abstract":"The potential of Calcinated and uncalcinated zinc oxide as effective Photocatatlyst for the degradation of malachite green dye, MG from aqueous medium using UV light has been identified. The photocatalysts were characterized using scanning electron microscope, SEM and x-ray diffraction, XRD. The SEM investigations of the calcinated ZnO revealed highly dispersed nanomaterials and the particles were of nanometer size in agreement with the XRD result. The uncalcinated zinc oxide, ZnO revealed some pronounced nanoparticles. The degradation of MG by the photocatalyst was found to be influenced by adsorbent loading and irradiating time. The optimum degradation was obtained at 0.5g catalyst loading of both calcinated and uncalcinated zinc oxide which is 98.48% and 96.31 % respectively at 150 minutes. The degradation kinetics conformed to the pseudo-first-order kinetic model. The present study showed that calcinated and uncalcinated zinc oxide ZnO can be effectively used as efficient photocatalyst for the degradation of Malachite green dyes from aqueous solutions and effluents.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79803818","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: 21

Rubber Processing Effluent Treatment with Chitosan: A Natural Biopolymer in Comparison with a Synthetic Coagulant 壳聚糖处理橡胶加工废水:天然生物聚合物与合成混凝剂的比较

International Letters of Chemistry, Physics and Astronomy Pub Date : 2019-02-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.81.1

Christie O. Ize-Iyamua, I. H. Ifijen, O. K. Ize-Iyamu, J. Ukpebor, E. Ukpebor

{"title":"Rubber Processing Effluent Treatment with Chitosan: A Natural Biopolymer in Comparison with a Synthetic Coagulant","authors":"Christie O. Ize-Iyamua, I. H. Ifijen, O. K. Ize-Iyamu, J. Ukpebor, E. Ukpebor","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.81.1","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.81.1","url":null,"abstract":"Chitosan, a naturally occurring biopolymer extracted from prawn heads was used in the treatment of crump rubber processing effluent for safe disposal into the environment. The triplicate analyses of the effluent samples obtained by composite sampling method indicated high levels of pollution which violated the permissible limits of environmental discharge standards; with a low DO of 0.63mg/L, BOD, 312.00±1.32mg/L and COD, 1069.58±2.42mg/L (mean±SD) respectively. Chitosan was analyzed according to standard procedures; it showed good coagulative potentials from the elemental analysis and a degree of deacetylation of 76.5%. The crump rubber processing effluent was treated with chitosan and Iron (III) Chloride respectively by coagulation and flocculation method and the results obtained via the physico-chemical characterization of the treated effluent showed that the use of chitosan as a coagulant compared favourably with Iron (III) Chloride after treatment. DO levels increased from 0.63mg/L to 3.90 mg/L. There were also remarkable reduction in the Turbidity, Biochemical Oxygen Demand (BOD) and the Chemical Oxygen Demand (COD) levels of the treated samples by over 80% respectively and 70% reduction in the nutrient levels. The efficacy of chitosan in comparison with Iron (III) Chloride suggests that it can be used as a replacement for synthetic coagulants based on its availability and environmental friendliness.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72762004","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: 5