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伊通上地幔剪切带捕虏体中富铝尖晶石的地球化学特征

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吉林大学学报（地球科学版） 2006年第4期36卷 497-502页

作者：贾大成邢立新潘军 m.J.van Bergen h.van Roermund 吉林大学地球探测科学与技术学院长春130026 乌特勒支大学地球科学系

伊通上地幔剪切带中辉石岩、二辉橄榄岩和易剥橄榄岩是3个主要地幔捕虏体,其中尖晶石的化学成分以富铝为特征。辉石岩中尖晶石在薄片下呈绿色,为铝含量高、铬含量低的铝尖晶石;与之相比,二辉橄榄岩和易剥橄榄岩中尖晶石在薄片下呈棕色,... 详细信息

伊通上地幔剪切带中辉石岩、二辉橄榄岩和易剥橄榄岩是3个主要地幔捕虏体,其中尖晶石的化学成分以富铝为特征。辉石岩中尖晶石在薄片下呈绿色,为铝含量高、铬含量低的铝尖晶石;与之相比,二辉橄榄岩和易剥橄榄岩中尖晶石在薄片下呈棕色,为铝含量相对较低、铬含量相对较高的富铝铬尖晶石。尖晶石的颜色与Al、mg、Cr、Fe含量有关。在不同捕虏体中尖晶石成分具有不同的变化范围,尖晶石化学成分之间存在一定的相关性,mg#与Cr#,mg#与Fe2+和Cr与Al呈现负相关性,而mg#与Al#呈现出正相关性,反映不同捕虏体中尖晶石具有同一来源和成因联系。在地幔岩石部分熔融和结晶过程中Cr和Al的分异明显。固溶体条件下基本服从八面体Cr Al替代关系,而不同地幔捕虏体中尖晶石的成分差异是岩浆部分熔融和结晶过程中元素分异、固溶体离子替代的结果。

关键词：富铝尖晶石成分元素分异相关性

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化学的历史背景

化学的历史背景

Fabrication of an r-Al_2Ti intermetallic matrix composite reinforced with α-Al_2O_3 ceramic by discontinuous mechanical milling for thermite reaction

作者：亨利.m.·莱斯特(h.m. Leicesterm)

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International Journal of minerals,metallurgy and materials 2014年第10期21卷 1037-1043页

作者： A.mosleh m.Ehteshamzadeh R.Taherzadeh mousavian Department of materials Science and Engineering Shahid Bahonar University of Kerman Department of metallurgy Zanjan Branch Islamic Azad University

In this study, a powder mixture with an Al/TiO2 molar ratio of 10/3 was used to form an r-Al2Ti intermetallic matrix composite （ImC） reinforced with α-Al2O3 ceramic by a novel milling technique, called discontinuous mechanical milling （Dmm） instead of milling and ignition of the produced thermite. The results of energy dispersive X-ray spectroscopy （EDX） and X-ray diffraction （XRD） of samples with varying milling time indicate that this fabrication process requires considerable mechanical energy. It is shown that Al2Ti-α-Al2O3 ImC with small grain size was produced by Dmm after 15 h of ball milling. Peaks for γ-TLA1 as well as Al2Ti and Al2O3 are observed in XRD patterns after Dmm followed by heat treatment. The microhardness of the Dmm-treated composite produced after heat treatment was higher than hv 700.

关键词： composite materials intermetallics alumina titanium aluminide ball milling thermite reaction process

Physical and Dielectric Properties of Some Nonionic Surfactants

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Journal of materials Science & Technology 1998年第4期14卷 361-367页

作者： El-Anwar, I.m. El-henawii, S.A. National Research Center Dokki Cairo Egypt Faculty of Science Helwan University Egypt

Fatty acid esters have been prepared by reacting the acid C//1//8 with polyethylene glycols having varying numbers of oxyethylene units (4-88 units) by the direct esterification reaction method. Surface and interfacial tensions were studied at various experimental conditions, including, concentration, temperature and chemical constitution of the surfactant. Critical micelle concentrations (CmC), surface excess and residual area occupied by each surface active agent molecule A have been calculated by using Gibb's equations. CmC values range from 10 to 55 multiplied by 10** minus **5 mole/L for all studied agents, while the residual area occupied by each molecule varies from 0.6 to 1.5 nm**2. Variation of CmC of some of these agents with temperature have been also examined and the obtained data were used to calculate the heat of micellization delta h//m and the entropy change during micellization delta S//m. Values of delta h//m vary from 14.63 kJ/mole to 2.717 kJ/mole depending on the chemical constitution of the agent under consideration. The apparent dipole moments mu of three surfactant were measured following the headstrand's method. (Edited author abstract) 23 Refs.

关键词： Surface active agents

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质子低场核磁共振技术表征建筑石膏水化进程

建筑材料学报 2023年第8期26卷 879-885页

作者：王德强孙振平杨海静冀言亮 SETZER m J 同济大学先进土木工程材料教育部重点实验室上海201804 同济大学材料科学与工程学院上海201804 上海市水务局城市管网智能评估与修复工程技术研究中心上海201900 杜伊斯堡-埃森大学建筑物理与材料科学研究所北莱茵威斯特法伦埃森45121

基于溶解-析晶理论,根据X射线衍射和热重分析结果,将建筑石膏的水化进程划为4个水化阶段,并利用质子低场核磁共振技术研究了不同水膏比m_(W)/m_(G)和聚羧酸系减水剂(PCE)掺量下,新拌浆体横向弛豫时间T_(2)分布、T_(2)加权平均值T_(2)与... 详细信息

基于溶解-析晶理论,根据X射线衍射和热重分析结果,将建筑石膏的水化进程划为4个水化阶段,并利用质子低场核磁共振技术研究了不同水膏比m_(W)/m_(G)和聚羧酸系减水剂(PCE)掺量下,新拌浆体横向弛豫时间T_(2)分布、T_(2)加权平均值T_(2)与主峰峰面积Smain随水化时间的变化规律.结果表明:T_(2)和S_(main)的变化趋势与水化阶段均具有良好的相关性;增大m_(W)/m_(G)可以使建筑石膏水化阶段出现的时间提前,而掺加PCE则对建筑石膏有明显的缓凝作用.

关键词：质子低场核磁共振技术横向弛豫时间建筑石膏水化进程聚羧酸系减水剂

Preliminary evaluation of the radiotherapeutic efficacy of 131I-atorvastatin in rats with hepatocellular carcinoma

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Nuclear Science and Techniques 2020年第11期31卷 1-11页

作者： Nourihan S.Farrag Abeer m.Amin Labeled Compounds Department Hot Laboratories CentreEgyptian Atomic Energy Authority(EAEA)P.O.Box 13759CairoEgypt

As one of the most critical types of cancer,hepatocellular carcinoma(hCC)affects many people *** study demonstrated the prospective use of atorvastatin,a drug that inhibits the mevalonate pathway,causing hypolipidemia,as a carrier to deliver the iodine-131(131I)isotope to liver tissues for hCC *** atorvastatin radioiodination method was optimized for utilizing the131I *** radiochemical quality and the in vitro stability of the generated[131I]atorvastatin were *** addition,the biodistribution experiments of[131I]atorvastatin were evaluated in both normal and hCC-induced rat models.[131I]atorvastatin was produced at a maximum radiochemical yield of 86.7±0.49%.The[131I]atorvastatin solution purified via high-performance liquid chromatography showed good in vitro stability for 12 h after *** analyses revealed remarkable liver targeting capacity of[131I]atorvastatin and good localization of131I in liver ***,the encouraging biochemical profile and histopathologicalfindings have been reported,and preliminary investigations on the possible use of[131I]atorvastatin as a radiotracer and its impact on hCC radiotherapy in rats show promise.

关键词： hepatocellular carcinoma [131I]Atorvastatin Biodistribution Radiotherapy

SYNThESIS, ChARACTERIZATION AND BIOLOGICAL ACTIVITY OF POLYKETONES

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Chinese Journal of Polymer Science 2013年第3期31卷 471-480页

作者： Ismail A.Alkskas Altaher m.Alhubge Faizul Azam Polymer Lab Department of ChemistryFaculty of ScienceMisurata University Department of microbiology Faculty of ScienceMisurata University Faculty of Pharmacy Misurata University

Polyketone resins have been prepared by the Friedel-Crafts polymerization of dithiophenylidenecyclopentanone （I）, dithiophenylidenecyclohexanone （II） and dithiophenylideneacetone （III） with adipoyl, sebacoyl and terephthaloyl dichlorides using boron trifluoride as catalyst and carbon disulphide as solvent. Polymers were characterized with IR, 1h- NmR, and the results showed the presence of carbonyl of ketonic groups in the main chain. The polyketones have inherent viscosities of 0.40-0.70 dL/g. All the polymers are semicrystalline and most of them are partially soluble in most common organic solvents but freely soluble in aprotic solvents. The temperatures of 50% weight loss are as high as 185℃ to 280℃ in air, indicating that these aromatic polyketones have excellent thermal stability. All the polyketones were tested for their antimicrobial activity against bacteria and fungi.

关键词： Synthesis Characterization Polyketones Biological activity.

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后外交时代：不受约束的美国

后外交时代：不受约束的美国

A Seismic hazard map Based on Geology and Shear-wave Velocity in Rawalpindi–Islamabad,Pakistan

2004年

作者：（美）伊沃·h.达尔德尔（Iov h.Daalder）詹姆斯·m.林赛（James m.Lindsay）刘满贵译

本书分析了美国政府内部谁在决策，政界、军界高层人物间有着怎样错从复杂的关系，最高当权者的世界观如何，总体上对于重大事件前后的美国高层进行了剖析、刻画。

关键词：外交政策研究美国

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 659-673页

作者： Sarfraz KhAN muhammad WASEEm m.Asif KhAN National Centre of Excellence in Geology University of Peshawar 25130KPPakistan University of Peshawar 25120 KPPakistan

The‘twin cities’district of Rawalpindi–Islamabad is among the most endangered seismic regions in Pakistan,with the seismic hazard assessed(0.32 g)to intensity IX mmI for a 475-year return period.A seismic hazard map for Rawalpindi–Islamabad is presented herein,based on 85 shear-wave velocity(VS)profiles obtained through geophysical h/V measurements and from the geological map of the *** between the average top thirty-meter shear-wave velocities(VS30)and surficial geological units have been *** peak ground acceleration(PGA)maps for 150,475 and 2475-year return periods were converted into a seismic intensity *** increments for different soils were used to compute PGA values for 150,475 and 2475-year return *** located on softer ground experienced a higher degree of damage from moderate *** to the presence of soft clay or liquefiable soil and lateral spreading,a few locations may be classified as hybrid sites class C and *** map is a critical step in facilitating code-based site classification and seismic design throughout Rawalpindi–*** the seismic hazard map based on seismic intensities is no longer used in engineering geology,it is still important in seismological analysis and for civil protection purposes.

关键词： seismic hazard site classification intensity increment engineering geology Rawalpindi-Islamabad