较低温度(580～700℃)合成的高Tc(Tl-Ba-Ca-Cu-O)系超导体

按照名义组分1113和1112以较低的烧结温度(580～700℃)获得了一系列高Tc Tl-Ba-Ca-Cu-O系超导体,其最佳样品的零电阻温度为112K。电子衍射分析表明,样品中含有两相,主相属四方晶系,晶胞参数为a=b=0.547nm.c=2.931nm.α=β=Υ=90°,空间群为I4/mmm次相属正交晶系,晶胞参数为a=0.335nm,b=0.989nm.c=1.654nm,.α=β=Υ=90°,空间群为Pmmm。     

旋转台法鉴别斜长石双晶律

用旋转台法鉴别斜长石双晶律,在A.C.马富宁“斜长石主要双晶鉴别图的基础上。把11种⊥a切面增为17种,并绘制了立体图.对比斜长石双晶律和系统研究斜长石特征,应分别采用A.李德曼法和D.B.斯利蒙斯法,并举例详述了后者的应用.     

AN ANALYSIS ON THE STRUCTURE TYPES AND BENEFITS OF SLOPELAND AGROFORESTRY SYSTEMS-Taking the Three Gorge Reservoir Area As An Example

Chinahasalongltist0ryofaghcLIlturaldeveloPn1atn1edeveloPmatandLttilizahonofplanlsaremoreextensivethanthatofmotUAsinsandhills.Underthepressureofil11Promplivingstandardf0rl.2billionpeOPleatpresa1t,itistmdoubtedtoaCCeeratesl0PelanddeVeopmat.HOWdowerealizehig…     

Public housing and migration: a multi-level modelling approach

"This paper...[analyzes] the distance moved by one-year migrants using a multi-level modelling approach. Controlling for a range of socio-economic variables, derived from the 1991 British Census Sample of Anonymised Records (SAR), at both the individual and area level, the distance moved by household heads in public, privately rented and owner-occupied housing within Britain is assessed.... It is confirmed that migrants in public housing are less likely to migrate long distances than owner-occupiers and that the proportion of public housing in a SAR area, and the absolute reduction in public housing in a SAR area between 1981 and 1991, does not have a significant effect on the distance that in-migrants have moved."     

中国区域缺水问题的发展趋势与解决对策

分析了建国以来我国两个缺水阶段的特点，即第一阶段是由农田灌溉面积快速发展引起的，第二阶段是供水能力增长缓慢造成的；然后根据我国工业发展速度、宜农荒地面积和农田灌溉面积的增长情况，分５个地区对我国２１世纪的水资源需求进行了预测，２１世纪我国的需水量将持续增长，至２０５０年达９５０×１０９ｍ３，但供水发展缓慢，因此我国２１世纪上半叶区域缺水问题严重。最后提出了解决我国区域缺水问题的四条对策，即开源、节流、加强污水处理与扩大资金投入     

Late Pleistocene - Holocene slip history of the Langshan-Seertengshan piedmont fault (Inner Mongolia,northern China) from cosmogenic <Superscript>10</Superscript>Be dating on a bedrock fault scarp

Offset geomorphic features and deformed late Quaternary strata indicate active deformation along the Langshan-Seertengshan piedmont fault (LSPF), one of the most active faults in the Hetao fault zone in Inner Mongolia, North China. The widespread occurrence of bedrock fault scarps along the LSPF offers excellent opportunity to examine the faulting history. Using cosmogenic ¹⁰Be exposure dating, we measured the exposure ages of the western Langshankou scarp, located in the middle segment of the LSPF. Our data revealed at least two earthquakes that occurred at 22.2±3.3 ka and 7.2±2.4 ka, respectively. These events are consistent with previous paleoseismic trench studies. The regression of the relationship between the age and sampling height along the scarp yield a fault slip rate of 0.10 +0.05/-0.06 mm/yr, which is significantly lower than the average post-late Pleistocene fault slip rate of ~1 mm/yr, as estimated from the offset of the T2 terraces by previous studies. This indicates that the slip of the LSPF may have been accommodated by other fault branches.     

Composition and distribution of planktonic ciliates in the southern South China Sea during late summer: Comparison between surface and 75 m deep layer

Ciliates are very important components in most marine ecosystem.They are trophic link between the microbial food web and grazing food chain.In this study,ciliates were collected from 11 sites in the southern South China Sea(SCS) during August 25 to September 28,2011.Their composition and distribution at the surface and 75 m deep depth of the ocean were studied.A total of 30 species belonging to 22 genera were identified,and 22 species of 15 genera were Tintinnids.Eutintinnus fraknoii and E.stramentus were the most common species.The other dominants were strombidiids ciliates including Strombidium conicum and S.globosaneum,which were followed by the tide form,Mesodinium pulex.Ciliates abundance ranged from 46 ind L~(-1) to 368 ind L~(-1) in the open sites,46–368 ind L~(-1) at surface and 73–198 ind L~(-1) at 75 m deep layer.In the Yongshu reef,ciliates abundance ranged from 167 ind L~(-1) to 365 ind L~(-1) in the water column,similar to that in Sanya coral reef waters.Ciliates composition showed obvious difference between surface and 75 m deep layer at station S2(P 0.05),while no similar result was observed at other sites.At 75 m deep layer,salinity was negatively related to mixed layer depth(P 0.05),but positively to chlorophyll a concentration(P 0.05),indicating that the change of vertical mixing in water column influenced vertical distribution of ciliates in the southern SCS.     

乐清湾口海域春秋季甲壳动物的群落结构特征研究

根据2012年春季和10月在乐清湾口海域开展渔业资源调查所获甲壳动物资料,对乐清湾口海域的甲壳动物的种类组成、优势种、物种数量分布、生物多样性和群落结构相似性等群落结构特征及其影响因素进行了研究。结果表明,调查海域共鉴定出34种甲壳动物,隶属于2目17科23属,春季优势种仅有三疣梭子蟹1种,秋季为日本、口虾蛄、中华管鞭虾、三疣梭子蟹4种,两季优势种更替较显著;秋季物种数较春季丰富,调查水域中心区域物种数较多;秋季甲壳动物生物多样性指数高于春季;甲壳动物群落结构与海洋环境密切相关。乐清湾口海域的甲壳动物以季节性的广温低盐种类为主,该海域位于河口,受瓯江径流影响较大;春季受瓯江径流淡水水团影响,物种较少,而秋季受交汇水团影响,物种丰富;春秋季组内并无明显规律,地形、水深和水系等外部因素对甲壳动物群落结构影响较大。