Characteristics and evolution of mesozoic foreland fold and thrust belt in western Kunlun Shan, China

The authors’ analysis of the chemical components and sedimentary characteristics of the well developed Triassic strata in the southeastern part of western Kunlun Shan led them to conclude that the sediments comprise a set of typical deep-water to semi-deep-water flysch that formed in the passive continental margin of the Qiangtang Block. This suit of strata had undergone strong deformation giving rise to a SW-thrusting duplex, imbricate fans, high-angle thrust fault, recumbent fold, SW-inverted fold, etc.. The deformational intensity weakens gradually southeastward. This is a foreland fold and thrust belt caused by the collision between the Qiangtang Block and the island are on the southern margin of the the Tarim Plate at the end of late Triassic. The sedimentary and deformational characteristics of the Triassic strata were used to reconstruct the evolution of this foreland fold and thrust belt as proposed below. Before the end of Triassic, this region was a passive continental margin in the north of the Qiangtang Block. The end of Triassic to Jurassic was a stage of thrusting, folding, uplifting and development of the foreland basin. The evolution of the fold and thrust was completed in Cretaceous. Project supported by NSFC (49872073) and Key Project of NSFC.     

物质跨膜转运机制及最新研究进展

质膜对物质的通透性由膜和物质本身的属性来决定,脂溶性和分子直径不同的物质通过不同方式实现跨膜转运。本文综述了特跨膜转运的几种机制及春最新研究进展情况。     

英语被动语态与介词的搭配关系

英语被动语态可以分为行为被动语态和状态被动语态。由于两种被动语态的性质特征不同,与之搭配的介词也就不尽相同。有的介词既可以与行为被动语态搭配使用,也可以与状态被动语态搭配使用;有的介词却只能与状态被动语态搭配使用。     

单源三站外辐射源雷达目标探测性能

论述全向外辐射源雷达空中目标探测系统的主要问题及系统体制损失。针对单源单站（SISO）和单源三站（SITO）两种工作方式,在接收天线阵元数相同的情况下分析探测距离和定位精度。在单源三站条件下推导直角坐标系中的目标速度矢量表达式,并分析速度测量精度。研究结果表明,在一定条件下,单源三站组网方式的空间覆盖范围与单源单站相当,且具有平面定位精度较高,可获得目标速度矢量和技术实现难度小的特点。     

Removal of Organic Acids from Indoor Air in Museum Storage Rooms by Active and Passive Sorption Techniques

ABSTRACT

Adsorbent materials can be used for the removal of organic acids from air in storage rooms with heritage collections. The organic acid removal efficiency of two commercially available activated carbon air-filters were tested in situ in two unoccupied stores with densely packed collections. One filter was designed for outdoor type pollutants (Filter A), while the other was designed for organic acids in indoor air (Filter B). Furthermore, the acetic acid removal efficiency of a desiccant silica gel rotor used for dehumidification was measured in a laboratory at different relative humidity levels. Finally, passive removal of acetic acid by silica gel and unfired clay brick were tested in a chamber, and for clay brick at room level as well. Filter B had the highest removal efficiency. The removal efficiency of both filter types depended on the airflow and the filter performance varied considerably in situ from the values reported from standard laboratory tests. Increasing the filter airflow reduced the removal efficiency from 77% and down to 7% for Filter A, and from 92% to 24% for Filter B. There was almost no effect of active air filtration on the concentration of organic acids when this was measured in the middle and in the corner of the storage rooms away from the ventilation inlets. The desiccant dehumidifier removed 98–100% of the acetic acid from the air, independently of the relative humidity. The desiccant rotor will, however, only be running when there is a need for dehumidification and as a result will only periodically remove pollutants. The high acid removal efficiency by dry silica gel was furthermore demonstrated in a chamber test. A clay brick wall in a test room established a concentration gradient across the room and reduced the concentration of organic acids by 56% compared to close to the emission source.     

英语词汇教学探讨

词汇教学是英语教学中的一个重要环节,但往往被教师所忽略。如何有效地进行词汇教学是教师面临的一个课题。方法得当,则事半功倍。     

英汉语被动式的比较与翻译

英语被动式在使用场合和主题意义上有一定的相似性 ,但在表达意义、应用范围及表达形式三个方面存在较大的差异。在翻译英语被动句时 ,不能一一对应地硬译为汉语被动句 ;而应根据具体情况 ,充分考虑英汉语特点 ,适当转换形式 ,使译文通顺达意 ,避免翻译腔     

中专学生的消极心理及其防治

归纳列举了中专学生消极心理的几种表现,提出了防治的措施。     

试论英语被动态与汉语被动句之差异

英汉两种语言中表示主语和谓语之间的关系都要借助主动或被动这组语法形式和手段。但同一语法术语在这两种语言中所代表的内容不会完全相同。在英语中 ,有语态语法范畴 ,故有主动和被动语态之分 ,其被动语态的标记为be + -en ;而在汉语中因缺乏语态范畴 ,也就无所谓被动语态和主动语态之分。在动词谓语句中 ,如果主语是动作或行为的受事者 ,句子就是被动句。本文主要分析两种被动句的不同之处 ,以求从这一侧面来进行英汉对比。     

工程结构振动控制技术与发展

随着社会的发展,人们对建筑结构的性能提出了更高的要求,如发射塔的抗震要求、高层建筑中居住者的舒适感和抗震安全性的要求等。这些实际需求促进了对建筑结构控制的研究,其中,结构振动控制已成为目前结构工程学科中的一个十分活跃的研究领域。