98十字路——98年技术决策指南

当全世界的人都在使用VHS录象机时,没有谁还抱着Betamax机不放。当你的事业正处于成败关键时刻时尤为如此。但是在变幻莫测的PC市场上,互相竞争、热烈炒作的技术层出不穷,如何知道该把自己事业的成败押在什么赌注     

MTU柴油机消磁方法与试验结果

<正> 一、前言在海军的许多行动中,尤其在扫雷时,舰艇仅能有极弱的磁场。扫雷艇应尽可能以非铁材料建造。用木材制造船体,这在减弱艇的磁场方面起了重要作用。但木船中的船舶机械都有磁性,其中以柴油机的磁性为最强。为了减弱柴油机的磁性,常用的传统方法是以铝、奥氏体钢等无磁材料制造机身及其它机件。采用     

Practical observations on the methodology for determining 3-methyl-l-histidine using fluorescamine derivatives

The method for the detection and possible quantification of the unusual amino acid 3-methyl-l-histidine has been refined and elucidated. This is an essential prerequisite for the determination of its value as a robust unequivocal index of lean meat protein.     

第六章 未硫化胶料的流变行为(六)

E.压出 1.胶料沿螺杆的流动螺杆挤出机最初是在橡胶工业中研制,发展起来的而且现在仍然是橡胶工业最重要的压型设备(见图18)。通常橡胶是用单螺杆挤出机压出的。该机的螺杆密合地安装在加热的机筒中並在机筒中旋转。胶料从加料口喂入,     

Optical systems design for a stratospheric lidar system

The optical systems for the transmitter and receiver of a high-power lidar for stratospheric measurements have been designed and analyzed. The system requirements and design results are presented and explained. An important and driving factor of this design was the requirement for a small image diameter in the plane of an optical chopper to allow the high-intensity lidar returns from the lower atmosphere to be shielded from the detection system. Some results relevant to the optical performance of the system are presented. The resulting system has been constructed and is now in operation at the Mauna Loa Observatory, Hawaii, and is making regular measurements of stratospheric ozone, temperature, and aerosol profiles.     

智能生活、无处不在——专访加州尔湾智能家居CEO Joe Dada

自1992年起,位于加州的尔湾智能家居公司就开始提供如X-10照明控制系统、安防系统、智能开关及家庭自动化控制系统这类家居智能设备。这家公司的首席执行官JoeDada和他所领导的工程师、设计师团队建立了一个家居控制的新标准,我们称之为Insteon。它可以通过电力线通信和RF通信两种方式来控制设备。目前已有400多家公司把这个标准应用到自己的产品上。在拉斯维加斯,Dada接受了记者采访,具体阐述了这个新的家居控制标准。     

Mitochondria: A mirror into cellular dysfunction in heart disease

Cardiovascular (CV) disease is the single most significant cause of morbidity and mortality worldwide. The emerging global impact of CV disease means that the goals of early diagnosis and a wider range of treatment options are now increasingly pertinent. As such, there is a greater need to understand the molecular mechanisms involved and potential targets for intervention. Mitochondrial function is important for physiological maintenance of the cell, and when this function is altered, the cell can begin to suffer. Given the broad range and significant impacts of the cellular processes regulated by the mitochondria, it becomes important to understand the roles of the proteins associated with this organelle. Proteomic investigations of the mitochondria are hampered by the intrinsic properties of the organelle, including hydrophobic mitochondrial membranes; high proportion of basic proteins (pI greater than 8.0); and the relative dynamic range issues of the mitochondria. For these reasons, many proteomic studies investigate the mitochondria as a discrete subproteome. Once this has been achieved, the alterations that result in functional changes with CV disease can be observed. Those alterations that lead to changes in mitochondrial function, signaling and morphology, which have significant implications for the cardiomyocyte in the development of CV disease, are discussed.