International Letters of Chemistry, Physics and Astronomy最新文献_第3页

Adsorption, Equilibrium and Kinetic Studies of the Removal of Methyl Violet from Aqueous Solution Using White Potato Peel Powder 马铃薯皮粉对甲基紫的吸附、平衡及动力学研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-12-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.80.17

C. K. Enenebeaku, I. Ukaga, N. J. Okorocha, B. Onyeachu

引用次数: 2

Modification of Surface Properties of Silicon Wafers by Laser-Assisted Electrochemical Etching 激光辅助电化学蚀刻法修饰硅片表面性能

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-12-01 DOI: 10.18052/www.scipress.com/ilcpa.80.30

H. Hadi

引用次数: 5

The Dimerization Effects of Some Solutes on the Partition Coefficient kD in Binary Immiscible Solvents 某些溶质对二元不混溶溶剂中分配系数kD的二聚化效应

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-12-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.80.40

Veronica O. Onyeocha, O. D. Akpan, Ikejiofor A. Onuchukwu, M. A. Chidiebere

{"title":"The Dimerization Effects of Some Solutes on the Partition Coefficient kD in Binary Immiscible Solvents","authors":"Veronica O. Onyeocha, O. D. Akpan, Ikejiofor A. Onuchukwu, M. A. Chidiebere","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.80.40","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.80.40","url":null,"abstract":"The dimerization of a solute dissolved in binary immiscible solvents shows that the value of the partition coefficient, kD of the solutes are influenced by the dimerization constant, K of the solute in one of the solvents according to the description: (C_X^A)/(C_X^B ) = kD + 2kD2KCxB where CxA and CxB are the concentrations of the solute x in the solvents A and B respectively. Both kD and K are parameters that predict the extent of beneficiation for most minerals. Also, kD is a fundamental parameter that determines the extent of solute recovery during solvent extraction. In this study, it is found that the order K kD and K kD are the effects for acetic and succinic acids respectively in the binary solvents composed of carbon tetrachloride/water and diethylether/water systems respectively. These results suggest that the distributions of these solutes in the solvents are accompanied by the formation of succinic anhydride which is more favoured than the dimerization of the acetic acid. Also, the changes in the values of distribution enthalpies, HD are corroborated to explain these experimental observations.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"170 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79393270","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: 1

Retraction Notice: K.U. Isah et al., Betalain Pigments as Natural Photosensitizers for Dye-Sensitized Solar Cells: The Effect of Dye pH on the Photoelectric Parameters, International Letters of Chemistry, Physics and Astronomy, Vol. 55, pp. 86-93, 2015 撤回通知:K.U. Isah等，染料敏化太阳能电池中Betalain色素的天然光敏剂:染料pH值对光电参数的影响，国际化学快报，物理与天文，Vol. 55, pp. 86-93, 2015

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-08-01 DOI: 10.18052/www.scipress.com/ilcpa.79.29

K. Isah

引用次数: 0

Synthesis, Characterization and Antimicrobial Activity of 2-[1-(2,4-Dihydroxyphenyl)Ethylene]Hydrazine Carboxamide and its Zn(II) Metal Complex 2-[1-(2,4-二羟基苯基)乙烯]肼甲酰胺及其锌(II)金属配合物的合成、表征及抑菌活性

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.79.9

Ratnamala P. Sonawane

引用次数: 1

Synthesis, Characterization and Biological Evaluation of 3'-Benzoyl-5'-(Furan-2-yl)-4'-Phenylspiro[Indoline-3,2'-Pyrrolidin]-2-One Derivatives and its Molecular Docking Studies 3'-苯甲酰-5'-(呋喃-2-基)-4'-苯基螺[吲哚-3,2'-吡咯烷]-2- 1衍生物的合成、表征和生物学评价及其分子对接研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.79.17

D. Rajaraman, M. A. Doss, K. Krishnasamy

引用次数: 2

Calibration of Therapy Level Ionization Chamber at 60Co Teletherapy Beam Used for Radiation Therapy 放射治疗用60Co远射束治疗级电离室的校正

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.79.1

Md. Ali Reza, Md. Rakibul Islam, Md. Shakilur Rahman, M. Shamsuzzaman, Md. Rashedur Rahman, H. R. Khan

{"title":"Calibration of Therapy Level Ionization Chamber at 60Co Teletherapy Beam Used for Radiation Therapy","authors":"Md. Ali Reza, Md. Rakibul Islam, Md. Shakilur Rahman, M. Shamsuzzaman, Md. Rashedur Rahman, H. R. Khan","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.79.1","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.79.1","url":null,"abstract":"The accuracy and traceability of absorbed dose to water measurement of radiotherapy beam is a critical issue to achieve the curative outcome of cancer patients. The current dosimetry protocols for radiotherapy beams TRS-398, TG-51 and DIN-6800-2 are based on the calibration factor of ionization chamber in terms of absorbed dose to water for 60Co beam. The accuracy of the calibration factor of ionization chamber as well as output of radiotherapy beam is the primary requirements of precisional dose deliver to the tumor which is the QA part of radiotherapy dosimetry. In the present study, we have calibrated 9 different ionization chambers (8 thimbles and 1 parallel plate) of various active volumes for 60Co beam against reference standard NE2571 and compared with manufacturer’s values. The Percentage Depth Dose (PDD) and Output Factors (OF) of two cobalt units were measured with standard calibration system by following IAEA dosimetry protocol TRS-398 and compare with 6 MV photon beam from medical linear accelerator. The traceability of the dosimetry was verified by the participation of postal dose IAEA/WHO intercomparison program. The aim of the participation was to investigate uncertainties involved in the calibration of Ionization Chamber (IC) and absorbed dose measurement. The percentage of deviation relative to IAEA mean dose was found to be -0.2% (traceable limit ±5%), which shows an excellent agreement of calibration of beam as well as ionization chamber with international standard. The deviation of factors of ionization chambers between the measured and manufacturer’s values were found within 0.07-2.81% with an uncertainty of ±1.5% (k=1).","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"262 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73266404","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: 1

Study of the Interaction of Ciprofloxacin and Sparfloxacin with Biomolecules by Spectral, Electrochemical and Molecular Docking Methods 用光谱、电化学和分子对接方法研究环丙沙星和司帕沙星与生物分子的相互作用

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-04-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.78.1

N. Rajendiran, M. Suresh

引用次数: 8

The Gravitational Field in the Relativistic Uniform Model within the Framework of the Covariant Theory of Gravitation 在引力协变理论框架下相对论均匀模型中的引力场

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-04-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.78.39

Sergey G. Fedosin

{"title":"The Gravitational Field in the Relativistic Uniform Model within the Framework of the Covariant Theory of Gravitation","authors":"Sergey G. Fedosin","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.78.39","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.78.39","url":null,"abstract":"For the relativistic uniform system with an invariant mass density the exact expressions are determined for the potentials and strengths of the gravitational field, the energy of particles and fields. It is shown that, as in the classical case for bodies with a constant mass density, in the system with a zero vector potential of the gravitational field, the energy of the particles, associated with the scalar field potential, is twice as large in the absolute value as the energy defined by the tensor invariant of the gravitational field. The problem of inaccuracy of the use of the field’s stress-energy tensors for calculating the system’s mass and energy is considered. The found expressions for the gravitational field strengths inside and outside the system allow us to explain the occurrence of the large-scale structure of the observable Universe, and also to relate the energy density of gravitons in the vacuum field with the limiting mass density inside the proton. Both the Universe and the proton turn out to be relativistic uniform systems with the maximum possible parameters. The described approach allows us to calculate the maximum possible Lorentz factor of the matter particles at the center of the neutron star and at the center of the proton, and also to estimate the radius of action of the strong and ordinary gravitation in cosmological space.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"1 1","pages":"39-50"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77122315","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: 7

A Study of FTIR and some Mechanical Properties of Sodium Iodide (NaI) Salt Filled Polymer Polyvinyl Alcohol (PVA) Films 碘化钠(NaI)盐填充聚乙烯醇(PVA)薄膜的红外光谱及力学性能研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2018-04-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.78.30

S. A. Salman, N. Bakr, Huda T. Homad

引用次数: 5