温压工艺中聚合物添加剂的加入方式

采用温压技术制备铁基粉末冶金材料,研究了干混和湿混两种聚合物添加剂加入方式及压制温度对生坯和烧结体性能的影响,并对其作用机理进行了探讨.试验结果表明,干混混合粉生坯及烧结体的性能略高于湿混混合粉生坯及烧结体的性能,但前者的最佳压制温度范围略高.     

福建崇安─宁化地区金锡多金属成矿地球化学研究

本文较系统地研究了成矿元素。稀土元素和铅、硫、氢、氧同位素以及流体包裹体等成矿地球化学特征。探讨了成矿物质和成矿溶液来源。研究结果表明．不同成因类型矿床的成矿物质和成矿溶液来源存在很大差异。     

华南玄武岩红土化过程中微量元素地球化学

广东、海南的玄武岩．在强烈的红土化过程中．元素在红土剖面中发生迁移和残留、贫化和富集。根据红土化过程中元素的地球化学性状，将元素划分为活泼元素和不活泼元素两大类。并首次采用了元素它集因子这个概念来探讨红土化过程中微量元素的地球化学行为。最后讨论了红土化过程小金的表生富集作用。     

东海海域春季降水的化学特征

根据１９９４年４月１７日－２７日东海海域的降水雨样化学组份分析，并将春与我国上海及日本西海岸的降水化学组分进行了地比。认为东海海域的降水经与陆地源污染的输送有关，在东南风系作用下，降水肥东南海上气闭影响，从上海以东到日本以西的广阔的海域中，降水呈弱酸或中性，其化学组份表现为海洋化学的特征；在东北风系作用下，东海海域的降水主要受朝鲜半岛和日本方面污染源的影响，降水中ＳＯ４＾２－非海盐浓度比东南风系时     

中扬子台地北缘灯影组碳酸盐岩成岩作用序列及成岩模式

研究区主要的成岩作用类型有胶结、溶解、硅化、白云石化、压实-压溶和去白云石化作用等，详细研究了每种成岩作用的矿物岩石学特征及对孔隙形成、演化的影响。把研究区成岩环境划分为大气淡水成岩环境、海水成岩环境、混合水成岩环境、埋藏成岩环境和晚期表生成岩环境五大类．总结了每种成岩环境的成岩组构特征、成岩标志、δ18O和δC及微量元素Na+、Sr2+的分布规律。此外，还探讨了深水斜坡相粉-细晶白云岩和台地浅滩相颗粒白云岩的成岩演化序列与孔隙演化，最后概括出了研究区碳酸盐岩的成岩作用模式。     

林丹(γ-六六六)在土壤中的吸附性与其在土壤和小麦中残留量的关系

本文利用~(14)C—林丹研究了γ-六六六在不同土壤中的吸附性及其在土壤和小麦中残留量的关系。试验表明,γ-六六六在土壤中的吸附率与土壤中的有机质含量、可萃取铝含量和酸性等均有密切关系。同时,环境温度对吸附率也有一定影响。通过~(14)C—林丹在不同土壤和小麦植株中残留量的测定,证明土壤中γ-六六六的吸附率、小麦对土壤中r-六六六的吸收率以及γ-六六六在土壤和小麦中的残留量相互之间均有明显的相关性。为此,本研究不仅摸清了某些影响土壤吸附γ-六六六和小麦吸收γ-六六六的理化因子,同时,对用土壤某些理化性质的测定值来预测栽培试验时土壤和小麦中六六六的残留水平提供了一个途径。     

characteristics of PM2.5 in rural areas of southern Jiangsu Province, China

Introduction Anumberofstudiesabroadhavedemonstratedthat atmosphericfineparticulatematter(PM2.5,dp<2.5μm)is notonlyassociatedwithatmosphericvisibilityreductionbut alsohasaclearcorrelationwiththenumberofdailydeathsandhospitalizationsasaconsequenceofpulmonarydisease(Chan,1997;Christoforous,2000;Schwartz,1996;Wilson,1997).On18July,1997,theU.S.EnvironmentalProtectionAgency(USEPA)promulgatednewandsevere standardsforfineparticulates(PM2.5)withthesizebelow2.5μm(15μg m3asannualaverage,65μg m…     

Metamorphic evolution of eclogite and associated garnet-mica schist in the high-pressure metamorphic Maksyutov complex, Ural, Russia

Metasedimentary garnet-mica schists are interlayered with metabasic garnet–omphacite schists and enclose eclogite boudins in the high-pressure metamorphic Maksyutov complex in the Southern Urals, Russia. These three rock types were investigated in one outcrop and compared chemographically and thermobarometrically. The Fe/Mg distributions between garnet rim–omphacite and garnet rim–phengite pairs indicate different equilibration temperatures for the three samples, with the lowest temperature (500°C, >1.5 GPa) for the eclogite boudin, an intermediate temperature (630°C, >1.7 GPa) for the foliated eclogite and the highest temperature (650°C, >1.7 GPa) for the garnet-mica schist. The garnets in garnet-mica schist enclose abundant chloritoid relics and the Fe/Mg distribution between chloritoid and garnet records an earlier high-temperature stage (650°C, >2.0 GPa) before the garnet rim–phengite temperatures were reached. Together with some minimum- and maximum-pressure estimates three different prograde pressure–temperature paths and a common retrograde metamorphic evolution are interpreted from the chemographic and thermobarometric data. The different early metamorphic evolutions and conditions confirm the variability of protoliths, which are also indicated by different U/Pb zircon and rutile ages.     

The curve of ion exchange ratio(%)-pH of the interaction between suspended particles with Cd(II) in the Yellow River

The curve of ion exchange ratio(%)-pH of the interactionbetween suspended particles with Cd(II) in the Yellow River wasstudied. The effects of lysine on this curve have been alsoinvestigated. The results showed that (1) Cadmium in Cd(OH)+ formin the suspended particles exchanges with the cations.The exchangeratio of Cd2+ is nearly at its greatest value in the range of pH(8.0-8.5) in natural aquatic system; (2) Ion exchange ratiodecreases as the concentration of Cd2+ raises from 8.9×10-6 mol/L to 2x8.9 x 10-6mol/L; (3) At the lysine concentration of 6.8x10-6 mol/L, it can promote the ion exchange ratio; (4) Adsorption of thesuspended particles to cadmium is weaker in seawater and Jin ShaRiver than in the Yellow River.     

布、洛、维、肖氏硬度的相关关系

进行了布、洛、维、肖氏硬度之间的回归分析,建立了洛氏硬度与布氏、维氏、肖氏硬度之间,以及布氏硬度与维氏、肖氏硬度之间的回归关系式.