国标数字电视测量接收机前端的设计与实现

采用双芯片融合方案,设计和实现了一种符合中国数字电视地面传输标准的全模式测量接收机的接收前端系统.其方案的可行性已经在实践中得到验证.     

贮氢合金组成对电极性能的影响

本文研究了混合稀土MmBx贮氢合金B组分的钴含量和Mm(Ni_(0.70)Co_(0.16)Mn_(0.08)Al_(0.06))_x的配比数x对P-C-T曲线平衡氢压、放电容量和电池的循环使用寿命的影响。     

1000MW超超临界机组FSSS系统介绍与分析

介绍某电厂1 000 MW机组FSSS系统的相关设备和逻辑组成,对该机组FSSS逻辑的特点进行介绍和分析。分析表明与600 MW级的机组FSSS系统相比,其设计思想和控制策略基本一致,但在细节上仍有值得吸收消化和改进之处。     

Modeling and finite element analysis of rod and wire steel rolling process

Two thermomechanical coupled elastic-plastic finite element （FE） models were developed for predicting the 12-pass continuous rolling process of GCrl 5 rod and wire steel. The distances between stands in the proposed models were set according to the actual values, and the billets were shortened in the models to reduce the calculation time. To keep the continuity of simulation, a technique was developed to transfer temperature data between the meshes of different models in terms of nodal parameters by interpolation functions. The different process variables related to the rolling process, such as temperature, total equivalent plastic strain, equivalent plastic strain rate, and contact friction force, were analyzed. Also, the proposed models were applied to analyze the reason for the occurrence of an excessive spread in width. Meanwhile, it was also utilized to assess the influence of the roll diameter change on the simulated results such as temperature and rolling force. The simulated results of temperature are found to agree well with the measured results.     

交通灯控制系统中黄灯时间的确定

介绍了电灯的由来,探讨了黄灯时间的长短对交通安全正负两方面的影,在应用力学和运动学原理的基础上,提出了一种计算黄灯时间的模型.分析了模型建立的全部过程,最后列出了黄灯时间的求解公式.     

纳米材料应用于氧化还原蛋白质直接电化学的研究进展

纳米材料在氧化还原蛋白质的直接电化学研究方面的作用越来越受到人们的关注。综述了近几年来国内外纳米材料在氧化还原蛋白质直接电化学方面的一些研究与进展。重点介绍和归纳了零维纳米材料、一维纳米材料、二维纳米材料、复合纳米材料的研究现状及在传感器上的应用,并总结了纳米材料应用于传感器的发展及所存在的问题。     

Improving Nonlocal Means Method via a No-reference Image Content Metric for MRI Denoising

The patch matching of the traditional Nonlocal means （NLM） filter mainly depends on structure similarity and cannot adapt to the patch rotation or mirroring transformation. Therefore, designing a measure with rorationally invariant similarity is of significant importance for improving the effectiveness of patch comparison of NLM. This paper proposes to apply a no-reference image content metric with the rotation-invariance to NLM for denoising Magnetic resonance （MR） images. The metric measures quantitatively the content of a patch in an image, including sharpness, contrast, and geometric features such as textures and edges. The metric values for every patch are computed and added into the Gaussian matching kernel of NLM so as to effectively perform patch matching. The main advantage of the proposed method is that it does not need to rotate patches in different orientations during patch matching. Experimental results show that the proposed method is superior to the traditional NLM, the state-of-the-art method Block-matching and 3- D （BM3D） filtering and the Unbiased NLM （UNLM） for MRI denoislng.     

利用AVL657内燃机数据分析系统测量内燃机曲轴的扭转振动

阐述了利用ＡＶＬ６５７内燃机数据分析系统测量内燃机曲轴扭转振动的基本原理，计算程序和测量实例。     

HCCI柴油机燃烧过程数值模拟研究

均质压燃(HCCI:homgeneous charge compression ignition)燃烧方式已成为发动机领域的硬件研究热点。针对CA4D32-09型柴油机,对HCCI燃烧过程进行了计算模拟,并利用统计的方法对影响HCCI燃烧特性的因素进行分析,通过计算得出HCCI发动机燃烧过程的影响因素及发动机主要参数对混合气均质特性的作用。