基于最佳指数因子的自适应权值图像融合

依据现有的多波段遥感影像的融合方法和多波段图像融合效果的客观评价准则,提出了基于最佳指数因子的自适应权值图像融合算法.最后,结合互联网卫星数据,给出了实验结果.结果表明,该方法为研究人员提供一个较佳的融合后影像.     

Improved algorithm for calculating contributions to <Emphasis Type="Italic">D</Emphasis>-statistic

D-statistic contribution analysis has been frequently used in practice for fault diagnosis. Existing algorithms for computing contributions to D-statistic tend to distribute cross-term contribution equally between two correlated variables. This leads to increased variance in contribution estimation and hence poor separability of faulty and normal variables. A new method for contribution calculation to D-statistic is proposed here which introduces a weighting scheme capable of distinguishing the contributions of two correlated variables. Simulation examples show that the proposed approach achieves improved resolution for distinguishing faulty and normal conditions.     

Model and simulation of a new ultra-narrow trigger frequency alterable pulse generator

Two new kinds of ultra-narrow trigger frequency alterable picosecond pulse generator are presented. One can produce positive pulses and the other can produce negative pulses. The two pulse generators are subdivided into three parts: signal driving circuit, differentiator network and pulse shaping circuit. The pulse shaping circuit is made of step recovery diode (SRD) and short-circuit microstrip line. A positive pulse with width of 54 ps (50%–50%), rising time of 30 ps (10%–90%) and falling time of 32 ps (90%–10%), and a negative pulse with width of 54 ps (50%–50%), rising time of 30 ps (90%–10%) and falling time of 30 ps (10%–90%) are achieved in simulation. All of the components are ready-made and inexpensive. They can be applied in ultra-wideband (UWB) communication system, such as transmitters and receivers.     

Explore the possibility of forming fcc high entropy alloys in equal-atomic systems CoFeMnNiM and CoFeMnNiSmM

The multi-principal high-entropy alloys (HEAs) are promising new alloys. However, it is a challenge to screen out the suitable composition from the diverse combinations. Referring to the prototype AuCu₃ with AB₃-L1₂ structure, where it becomes a face-centered cubic (fcc) structure if element A and B are the same element, the site occupying tendencies of the elements and thermodynamic functions are predicted by using the sublattice model supported with first-principles total energy calculations. By considering the Gibbs energy of formation and the configurational entropy, the fcc HEAs in available literatures are examined, and the results of the quinary system with equal-atomic composition CoFeMnNiM and the hexbasic system with equal-atomic composition CoFeMnNiSmM are reported, respectively, where the element M is selected from the rest of the periodical table. When M=Cr, Zn, Ru, Rh, Pd, Re, Os, Ir, or Pt in the quinary systems CoFeMnNiM and when M=Ru, Pd, or Pt in the hexbasic systems CoFeMnNiSmM, respectively, the alloys are recommended to be potential fcc HEAs. The new approach opens a new way to mine the rich ores of HEAs.     

4轮驱动车辆ASR半物理仿真研究

为提高前轮驱动车辆在低附着或对开路面上的加速性能,设计了基于节气门与制动干预联合控制的驱动防滑系统。该控制程序针对车辆的各种工况和ABS/ASR集成系统的执行机构,将成熟的ABS和ASR控制逻辑有机结合起来,并将制动操作的优先级设置为最高,避免了由于误操作造成的安全隐患,最后通过实车试验对控制逻辑进行了验证。试验结果表明该逻辑设计合理,集成系统能够满足各种实时工况的要求,达到提高车辆的主动安全性能的目的。     

全球化:人权及其保障的陷阱

人权的核心价值在于对普遍平等性的强调。在当前世界结构中,人权保障的主要负担者依然离不开主权国家。然而全球化下出于不同竞争地位的主权国家之间的差距只能愈加扩大。这导致以主权国家为单位的人们之间的贫富悬殊固定化。这使得处于弱势地位的国家没有力量为其民众提供最基本服务。全球化是人权及其保障的陷阱。     

国外城市自行车发展模式分析及对我国城市自行车发展的启示

在我国城市自行车交通出行比例有所下降,但保有量依然很大的背景下,探索自行车交通的发展出路.通过分析哥本哈根、东京两个城市中不同的自行车交通发展模式,从中得到我国城市自行车交通发展出路的一点启示.并将东京与上海市的城市结构、交通特性进行比较,得出上海市的人口密度、交通结构以及交通发展政策与东京相似,东京的自行车交通发展对...     

基于VB的柴油机示工图上止点修正

利用示功图来计算柴油机燃烧过程是研究和诊断柴油机燃烧过程的有效手段之一,而计算结果的准确度主要取决于示功图的测录与处理。本文介绍了两种示工图上止点修正方法,按照上止点修正理论编辑了上止点修正的程序块,并对四冲程柴油机实测倒拖示功图进行了上止点修正。结果发现,随着转速的升高,漏泄及传热损失减小,热力损失角也随之减小。     

发电机调节器刷架总成设计

描述了一种自主设计的新型汽车交流发电机调节器刷架总成。该设计通过多层电路联接的方式将电子元器件、金属电路以及印刷电路板组成一个立体回路。将调节器刷架总成中的信号电路与功率电路巧妙地分隔开来,最后再与双层散热板整体注塑,形成一个整体。为电子与机械的有机结合作出了尝试。     

软硬沥青复配温拌技术的费用效益分析

基于浙江省S208省道杭昱线昌化段软硬沥青复配温拌技术试验路工程,分析了软硬沥青复配温拌混合料和热拌沥青混合料所铺筑的沥青面层的建设费用、施工过程中的节能减排指标、路用性能和使用寿命,并提出用寿命/费用比指标来综合评价混合料的费用效益。研究表明:与热拌沥青混合料相比,软硬沥青复配混合料的初期建设费用较高,但其寿命/费用提高了54%,同时具有较好的路用性能,节能减排效果显著,因此有着广阔的推广应用前景。