基于能流图的混合动力车数据分析方法

相比传统汽车,混合动力车驱动系统更加复杂,具有多个能量源,其能量流具有多路特性,所以在其控制中,及时获得相关数据,并对数据进行完整的分析显得尤为重要。能流图作为统计数据的整理和分析工具,目前已在很多能源领域得到广泛应用,但在汽车上的应用尚少。本文参照当前国际上普遍采用的能流图结构,以从实际运行的混合动力车上采集的数据,绘制典型的混合动力车的能流图,并予以分析。该方法已成功应用于国内某混合动力车。     

基于用户相关数据的乘用车试验场变速强化试验方法

为避免以往乘用车传动系可靠性试验的盲目性,提出一种与用户实际使用工况相关联的变速强化试验方法,该方法采集强化路和用户典型路面的试验数据,计算传动轴各级转矩对应的累积疲劳损伤。利用Weibull分布和Monte-Carlo仿真模拟90%用户的总损伤,最终获得试验场变速试验强化系数,为科学评价乘用车传动系可靠性和可靠性试验规范的制订提供技术依据。     

全电力船舶的电力推进系统建模与仿真

本文介绍了全电力船舶的典型推进系统并给出了仿真结果。由于模型的复杂性,仿真计算的工程量非常巨大。因此设计了一个可供替代的简化仿真系统。从船舶网络的角度来看,简化系统的仿真结果和实际模型的结果十分接近。     

运梁车过桥对成桥阶段混凝土箱梁的结构影响

在黄冈大桥全桥合龙后,为加快南跨引桥预制 T 梁的施工进度,采取通过北侧梁板运输车过桥运梁支援南侧的 T 梁施工,以提高施工进度。通过有限元结构分析软件建立实体模型,对梁板运输车过桥不同的工况下关键截面的应力和变形进行分析,结果表明在最不利荷载作用下的关键截面产生的应力和变形满足结构的允许值,符合设计要求,验证了该方案的可行性。     

语用顺应论在口译介绍语类中的研究

语言顺应论认为语言的使用即选择。语言的使用要顺应不同的交际对象和环境。本文从顺应论的四个角度,即:语言的语境顺应、语言结构顺应、动态顺应以及顺应过程的突显性,探讨了介绍语类的口译过程。在这个过程中,译员要动态地选择顺应对象和口译策略,最大限度地实现相应的语言顺应。     

直管法兰智能装配装备研究

为了实现直管法兰自动化、智能化装配加工作业,就需要解决法兰取料、法兰双孔正及旋转预转角、直管法兰定位装配等难题.本文首先分析直管法兰装配工艺现状及难点,以及直管法兰智能装配装备需求的主要功能.然后介绍直管法兰智能装配装备的总体方案及基本结构组成.并介绍了直管法兰智能装配的施工流程和装备的信息数据流程.最后,结合某直管法...     

Filter bank based nonlocal means for denoising magnetic resonance images

Image denoising is a classical problem in image processing. Its essential goal is to preserve the image features and to reduce noise effectively. The nonlocal means （NL-means） filter is a successful approach proposed in recent years due to its patch similarity comparison. However, the accuracy of similarities in this algorithm degrades when it suffers from heavy noise. In this paper, we introduce feature similarities based on a multi- channel filter into NL=means filter. The multi-bank based feature vectors of each pixel in the image are computed by convolving from various orientations and scales to Leung-Malik set （edge, bar and spot filters）, and then the similarities based on this information are computed instead of pixel intensity. Experiments are carried out with Rician noise. The results demonstrate the superior performance of the proposed method. The wavelet-based method and traditional NL-means in term of both mean square error （MSE） and perceptual quality are compared with the proposed method, and structural similarity （SSIM） and quality index based on local variance （QILV） are given.     

Genome-wide profiling identifies Saccharomyces cerevisiae response in PKC-SLT2 signaling and glycogen metabolic pathways to antifungal compound calcofluor white

Fungal infection remains a major problem worldwide, yet treatment options are limited owing to the lack of effective drugs, the significant toxicity of available compounds, and the emergence of drug resistance. The low toxicity of calcofluor white （CFW） is an attractive antifungal compound for its known inhibitive effects on trichophyton rubrum and candida albicans growth. However, the efficacy of CFW is limited in most cases. In order to search for effective means to improve its efficacy, using saccharomyces cerevisiae as a model, we have used microarrays to examine the cell＇s response when treated with CFW on the genome scale. We found that both the PKC-SLT2 （i.e, protein kinase C-mitogen activated protein kinase） and the glycogen metabolic pathways are activated upon CFW treatment. These results suggest that the key components in these pathways could be targeted by other drugs to counter the cell＇s compensative response, thus to further substantiate the inhibitive effect of CFW on fungal growth, which may lead to treatment regimens with improved efficacy of this compound in clinical applications.     

船舶螺旋桨机翼型桨叶周围粘性绕流的研究

此研究从N-S基本方程出发,采用亚格子尺度模型,运用大涡模拟方法,通过数值计算研究了船舶螺旋桨机翼型桨叶在低马赫数下的粘性绕流情况,其中包括创建模型、网格划分等,获得了速度场、压力场和涡量场等图像,对减小船舶阻力、降低振动噪声和提高船舶螺旋桨的设计水平具有十分积极的现实意义。     

黄土地铁隧道锚杆布置方式的模型试验研究

文章利用平面应变三向加载装置进行室内模型试验,对无锚杆、全环锚杆和边墙锚杆三种锚杆布置方式进行了对比试验,并参考工程现场测试结果,对系统锚杆在黄土地铁隧道中的作用进行了研究;通过模型试验获得了适合黄土地铁隧道的锚杆相似材料,实现了"先加载,后挖洞"以及锚杆和衬砌联为一体的试验方法。通过对比发现:系统锚杆能较好地控制掌子面周围的塑性区发展;边墙锚杆在隧道洞室开挖支护后能加快围岩应力调整,且能有效改善衬砌的受力情况;综合考虑经济因素,认为边墙锚杆支护系统在浅埋暗挖黄土地铁围岩中加固效果较好,实际施工中应予以保留。