结构动态稳定性数值模拟研究

采用有限元方法计算了加筋板在流固冲击下的动态稳定性,研究的目的是对舱壁结构受水下爆炸冲击时的动态稳定性提供参考和依据.详细分析了影响加筋结构动态屈曲的各种因素:加筋与筋的厚度、初始几何缺陷的形式与大小、冲击载荷的脉宽和幅值、边界条件、筋的分布以及板的厚度.在分析研究的基础上提出了改善加筋板抗失稳的方法,以利于工程设计中具体应用.     

铝合金舰船结构设计中相关问题探讨

从分析舰船用铝合金的物理化学性能、加工性能及焊接性能入手,阐述铝合金用于船舶建造的诸多优越性.提出在铝合金舰舶的结构设计中应推广应用带筋板结构,当上层建筑采用铝合金结构,主船体为钢质时,应采用结构过渡接头直接焊接的方法.     

Studies on DNA Vaccine of the Conservative Region of Gene Encoding the Male-Specific Gynecophoral Canal Protein of Schistosoma japonicum (Chinese strain)

Schistosome parasites are unique among thetrematodes that the sex are separated. The maleand female Schistosome are different individualswhich have the particular characteristic. The de-velopment and fertility of the female Schistosomeis completely dependent on continuous amphimixiswith male. Unpaired female remain stunted andsexually immature . The female worm required theinteraction with male worm to achieve the sexualmaturity[1]. The mature worm produced a largenumber of eggs in the anima…     

Studies on Arteanninum and Allicinum in the Treatment of Eperythrozoonosis

Since the year 1928, when Schilling andDinger first discovered eperythrozoon from ro-dent[1], eperythrozoon has been spread all over theworld[2~6]. Described by Puntaric and his col-leagues in 1986[7], the eperythrozoonosis has beenattached more and more importance on its infectionroute and outbreak character[7~11]. Since mosteperythrozoonosis is a latent infection and the un-successful artificial cultivation of the pathogeny,the research conducting the life circle, transmis-sion, infection r…     

Effect of Cysteamine-preparation on Dairy Performance of Dairy Holstein Friesian Cows

Many studies have demonstrated that growthhormone (GH) plays very important role in regu-lating animals' lactation. The milk production oflactational animals can be increased and the feedefficiency can also be improved markedly by longterm or short term a…     

Studies on Artificial Replica of Eperythrozoonosis

Eperythrozoonosis is an infectious diseasecaused by autoeciousness of special blood para-sites-eperythrozoon in erythrocyte and character-ized with symptoms of anaemia, icterus and highfever. The disease is ubiquitous and occurs in allcountries[1~7]. Besides the losses in production,eperythrozoonosis is now discovered a zoonosis,which raised a public health problem[8~12]. Natu-rally, eperythrozoonosis is often an inapparent in-fection with no specific clinical signs, which makesthe disease neg…     

某和谐号动车组运营中轮对内侧距变化规律研究

轮对内侧距是保证动车组运营中动力学性能稳定和运营安全的重要参数.通过该参数的大样本分析发现,运营中的某和谐号动车组轮对内侧距存在明显的变化规律,轮对微动、轮辋碾宽、辐板微变形等因素是引发轮对内侧距变化的主要原因.为保证动车组正常、安全运营,轮对运用修及高级检修时,需按要求检测轮对内侧距,超出标准要求时应及时更换轮对或对...     

百年老站话今昔

朋友,你可曾注意过,无论是你乘坐的列车徐徐进入北京;还是你乘火车驶离京城,列车总是要通过这样一个车站——丰台站,它是由北京通往京山、京沪、丰沙等干线的咽喉要道,它是一个历尽沧桑的百年老站…… 建站始末 丰台车站位于北京市丰台区正阳大街南侧。据丰台站站志记载:1888年清政府直隶总督李鸿章提出     

舰船子系统的生命力评估模型

针对大型水面舰艇,传统生命力评估方法和评估模型均不适用。由于二级子系统是生命力评估的重点,本文通过定义二级子系统下属设备之间的影响关系,建立设备状态或损伤概率的评估模型。对二级子系统的输入输出节点进行建模,利用神经网络自学习、自组织和联想记忆功能,建立了基于神经网络的二级子系统评估模型。结果表明,文中所建立的评估模型能较好的解决大型水面舰艇子系统的生命力评估问题,具有很强的实用性。