纺织工业中采购过程组织的手段和方法

外部环境的变化导致了重新研究纺织工业中采购过程组织的必要性。通过分析采购过程组织的内涵以及纺织工业中采购过程的特殊性，指出了现行采购组织方法和手段的不足，提出基于后勤理论的采购过程组织的程序化规则。     

Evaluation of a multimode fiber optic low coherence interferometer for path length resolved Doppler measurements of diffuse light

The performance of a graded index multimode fiber optic low coherence Mach-Zehnder interferometer with phase modulation is analyzed. Investigated aspects were its ability to measure path length distributions and to perform path length resolved Doppler measurements of multiple scattered photons in a turbid suspension of particles undergoing Brownian and translational motion. The path length resolution of this instrument is compared with a system using single mode fibers for illumination and detection. The optical path lengths are determined from the zero order moment of the phase modulation peak in the power spectrum. The weighted first moment, which is equal to the average Doppler shift, shows a linear response for different mean flow velocities within the physiological range.     

Review of patient dosimetry in cardiology

The objective of the study is to review doses to patients undergoing interventional cardiology procedures, doses that are known to be substantial due to prolonged fluoroscopy time and multiple radiographic exposures. High doses together with the fact that the use of radiation in cardiology is increasing, makes the assessment of patient dose and the establishment of reference dose levels necessary. Thus MED 97 can be better implemented in all EU member countries. The literature review has shown that data is limited and difficult to compare due to various dose indicators, different physical parameters of X ray equipment, various examination protocols and variations in patients' size and complexity of case. For these reasons, European countries participating in DIMOND II submitted data for percutaneous transluminal coronary angioplasty and coronary angiography. Reference dose levels were defined in terms of dose-area product, fluoroscopic time and number of frames.     

Continuous carbon nanotube reinforced composites

Carbon nanotubes are considered short fibers, and polymer composites with nanotube fillers are always analogues of random, short fiber composites. The real structural carbon fiber composites, on the other hand, always contain carbon fiber reinforcements where fibers run continuously through the composite matrix. With the recent optimization in aligned nanotube growth, samples of nanotubes in macroscopic lengths have become available, and this allows the creation of composites that are similar to the continuous fiber composites with individual nanotubes running continuously through the composite body. This allows the proper utilization of the extreme high modulus and strength predicted for nanotubes in structural composites. Here, we fabricate such continuous nanotube polymer composites with continuous nanotube reinforcements and report that under compressive loadings, the nanotube composites can generate more than an order of magnitude improvement in the longitudinal modulus (up to 3,300%) as well as damping capability (up to 2,100%). It is also observed that composites with a random distribution of nanotubes of same length and similar filler fraction provide three times less effective reinforcement in composites.     

LCC-MMC特高压混合直流输电系统高低压阀组均压控制策略

整流侧为LCC、逆变侧为MMC的LCC-MMC特高压混合直流输电系统的换流站由高低压阀组串联形成,当系统采用“LCC定电流控制/MMC定电压控制”和“LCC定电压控制/MMC定功率控制”两种控制策略时,分别存在整流站LCC和逆变站MMC的高低压阀组直流电压和有功功率不平衡的现象。提出了高低压阀组之间存在的不平衡电流和阀组电压未直接受控是导致阀组间直流电压不平衡的原因,并分析了不平衡现象的机理过程。对此提出了基于高低压阀组实际电压与额定电压偏差修正控制目标的均压控制策略,使得阀组间直流电压能够得到均衡控制。最后在PSCAD/EMTDC平台上对提出的均压控制策略进行了有效性验证。     

音质令人惊喜的迷你Hi-Fi JRing(君聆) JMA系列迷你音响

JRing是一个很有特色的Hi-Fi音响品牌。它之所以有特色,是因为它所生产的音响外形都非常迷你,但产品的定位又不像一般的时尚迷你音响,而是向发烧音响的方向看齐。本文要介绍的JMA则是JRing第-款主打的放大器。JMA迷你音响由PA10前级搭配A70后级组合而成。虽然这两款产品的体积不大,但设计上都符合发烧音响的设计原则。     

闲暇一个人的音乐空间 DAVONE Mojo

Davone是一个充满个性的音响品牌,毕竟Davone的主要创始人是一名艺术工作者,因而十分注重外形的设计和工艺,不像大多数的音响品牌,Davone每一款产品的外形都有自己的特色。所以,我们在听Davone的音箱时,除了欣赏它的美声,别忘了欣赏它的外形和工艺,这样才叫懂得欣赏Davone。这次我试听Davone最便宜的一款产品,名叫Mojo。当我第一眼看到Mojo的时候,我只能说Mojo太漂亮了,太时尚了!这样的音箱,我认为不管什么人看到都跟我有相同的想法。     

通过丰富的连接方式提供多种高质量电台节目Tivoli Audio NetWorks单声道网络收音机

现在,我每天都有打开电脑收听一到两个小时网络电台的习惯,而且渐渐地成为了生活的一部分。习惯听网络电台的原因是因为网络电台节目多,有些电台甚至24小进不间断地播放音乐,可充当背景音乐之用。但由于用电脑听网络电台需要安装软件以及进行一些操作,比较麻烦,因此我认为使用专用网络收音机是最好的解决办法。     

沉积盆地大地构造学

前言七十年代和八十年代是盆地分析的动力学分折时期。我们对现代和古动力学过程了解中的一些突破已或大或小地导致了对盆地分析极为重要的一些学科的重大进展。对盆地分析同样重要的是我们对现代沉积体系理解的革命以及随后在完善实际的沉积模式中的重大发展。把沉积组份,特别是砂和砂岩的一些实际岩石学模式与板块构造背景相联系已取得进展。地震