Serpentine minerals: intergrowths and new combination structures

The serpentine minerals chrysotile, lizardite, and antigorite have been found intimately intergrown with each other and with talc, chlorite, and amphibole in incompletely reacted chain silicates. High-resolution transmission electron microscopy has revealed new variations in serpentine planar and roll structures, as well as regions of mixed-layer silicate consisting of serpentine and talc layers.     

Industrial research in america: challenge of a new synthesis

Industrial research in America faces a new era. Success will depend on a synthesis utilizing the strengths of industry, government, and academia to achieve industrial innovation. The origins of U.S. industrial research in the 19th century have led to its current traditions and philosophy. Vigorous, diverse, animated by both basic scientific knowledge and empirical techniques, it is today channeled by both societal needs and new technical possibilities. Many of its efforts involve fundamental research. Meeting future expectations will require even broader science, much of it from academia, as well as a license to function from governments and society.     

Asbestiform chain silicates: new minerals and structural groups

The discovery and characterization of structurally ordered and disordered phases that are intermediate between amphiboles and micas have shown that the biopyriboles are a much more complex family of minerals than has previously been recognized. In addition to single-chain, double-chain, and sheet structures, there are also minerals with triple chains and with alternating double and triple chains. Many crystals exhibit disorder in the sequence of double and triple chains, and isolated chains that are wider than triple are common. This structural disorder helps to explain why asbestiform amphiboles are fibrous. The new phases have now been found in several localities, and it is possible that similar phenomena in other minerals could also have been overlooked. In particular, there is no reason to suppose that analogous substances and structures with both single and double chains do not occur between the pyroxenes and the amphiboles. Since the pyroxenes are used extensively by geologists to assess rock histories and formation temperatures and pressures, it is essential that the extent of this type of disorder be evaluated. It is possible that what appears to be only an interesting mineralogical problem may prove to be a petrological nightmare.     

对如何认识和学习农业推广学的思考

推广学是一门实用的新学科。以多年的教学经验为基础,针对人们在认识和学习农业推广学时存在的误区,提出了改进教学工作的三点建议,包括关注农业推广实践及其发展趋势,了解推广学的理论来源、相关学科和研究成果,改进学习方法。     

关于做好项目经理问题的探讨

项目经理在施工中处于中心地位，对项目进行全过程的施工和经营管理，既是生产经营的活动中心，又是履行合同的主体。并对项目费用、质量、工期、降低成本和安全文明负责。项目经理对施工具有管理和服务的双重职能，其工作质量是施工质量的决定性因素。     

高校图书馆采编部消除图书积压的一种新办法——集体承包制

图书馆采编部图书积压一直是图书馆的一块心病,本文结合本馆的工作,找出了积压的原因及弊端,并提出了消除积压的对策。