沥青抗剥落剂在寒冷地区路面施工中的使用效果

沥青抗剥落剂是一种新型外掺剂 ,使用这种外掺剂可以有效的提高沥青和沥青混凝土粗集料的粘附性 ,同时扩展了沥青混凝土石料范围 ,在不影响使用效果的同时 ,降低建设成本。     

水下分散自重构模块的硬件设计

水下分散自重构系统(USS)是一种链式的水下自重构机器人，目前仅包含一种自重构模块(USM—1)，由于水下环境的特殊性，该模块具有不同于陆地自重构机器人模块的特点，详细介绍USM—1的硬件设计，并通过试验检验了USM—1运动和自重构的能力。     

Numerical Investigation of the Dynamics for Low Tension Marine Cables

This paper presents a numerical investigation into the dynamics of marine cables which are extensively used in offshore industry. In this numerical study, the Euler-Bernoulli beam model is adopted to develop the governing equations of the cable. Bending stiffness is considered to cope with the low tension problem in local area of towing cable, and thus a more accurate solution with the consideration of the axial elongation can be given.The derived strongly-coupled and nonlinear governing equations are solved by a second-order accurate, implicit,and large time step stable central finite difference method. The quadratically convergent Newton-Raphson iteration method is applied to solving the discrete nonlinear algebraic equations. Then a towed array sonar system(TASS)problem is studied. The numerical solutions agree reasonably well with the experimental data and the simulated results of the references. The specified program of the present paper shows great robustness with high efficiency.     

A Two-Stage Feature Selection Method for Text Categorization by Using Category Correlation Degree and Latent Semantic Indexing

With the purpose of improving the accuracy of text categorization and reducing the dimension of the feature space,this paper proposes a two-stage feature selection method based on a novel category correlation degree(CCD)method and latent semantic indexing(LSI).In the first stage,a novel CCD method is proposed to select the most effective features for text classification,which is more effective than the traditional feature selection method.In the second stage,document representation requires a high dimensionality of the feature space and does not take into account the semantic relation between features,which leads to a poor categorization accuracy.So LSI method is proposed to solve these problems by using statistically derived conceptual indices to replace the individual terms which can discover the important correlative relationship between features and reduce the feature space dimension.Firstly,each feature in our algorithm is ranked depending on their importance of classification using CCD method.Secondly,we construct a new semantic space based on LSI method among features.The experimental results have proved that our method can reduce effectively the dimension of text vector and improve the performance of text categorization.     

“海马”号4500米级ROV系统研发历程

作为国家863计划重点项目"4500米级深海作业系统"的主要研究成果,"海马"号4500米级无人遥控潜水器(ROV)于2014年2~4月在南海成功完成了海试。"海马"号是我国自主研发的第一套大深度ROV系统,最大工作水深4500m,主要作业功能是进行海底探测、取样以及其他水下作业。"海马"号的研发和海试成功是我国海洋技术领域继"蛟龙"号后的又一个标志性成果。介绍了"海马"号ROV的立项背景、研究目标、系统组成、总体技术性能和功能及其研发历程和海试情况。     

军事通信资源竞争机制初探

资源竞争现象在各种通信网络中都有一定程度的存在.在分析多种资源竞争解决机制和军事领域特点的基础上,探讨资源竞争处理机制在军事通信中的应用,并进一步指出以后的主要研究方向.     

红楼梦中的"二位一体"-浅析妙黛形象地位

曹雪芹在《红楼梦》中创造了众多的女性形象,通过对她们的观察,我们会发现黛玉和妙玉二人身上存在诸多的相似之处,综合起来看可以看作是同一个人在扮演两个不同的角色,也就是说这两人分而为两个完整的女性形象,合而为一个新的女性形象,而这个新的女性形象正是作者曹雪芹心中理想的女性形象,但作者将其一分为二。这样的安排是作者的匠心之所在,多视角的展现大观园的生活,从而展现封建社会对女性的摧残,避免了人物形象的单一性,丰富了作品的情节内容等。     

FL型车站控制台语音报警系统

当前，铁路各既有线6502电气集中系统大、中、小站控制台的报警音响，全是由电铃来实现。这些电铃从功能上大致分为以下几种：①上、下行闭塞电铃；②上、下行接近电铃；③组合架上熔丝报警电铃；④站内信号机断丝报警电铃；⑤区间信号机断丝报警电铃；⑥挤岔报警电铃；⑦主、副电源转换报警电铃；⑧信号关闭报警电铃；⑨上、下行道口遮断信号机报警电铃等。另外，复线自动闭塞区段，还有上逆、下逆接近电铃；     

三种中药钙拮抗剂对家兔急性降压实验的比较

麻醉家兔急性降压实验表明,三种中药钙拮抗剂汉防己甲素、异紫堇啡碱和川芎嗪,均能降低血压并减慢其心率。三药降压效力为汉防己甲素>异紫堇啡碱>川芎嗪。而汉防己甲素与异紫堇啡碱等量合用,降压效果明显增强。     

Reposition of empty containers of different life stages integrated with liner shipping network design

ABSTRACT

This paper integrates empty container reposition with container shipping network design considering the container life stages. A mixed-integer linear programming model is built to determine the liner shipping network, the initial launch ports of new containers, the ports for scrapping obsolete containers, the empty container reposition scheme and the containers of different life stages being used for a specific voyage. A case study is done by taking liner shipping among China, Japan and South Korea, Southeast Asia, Europe and the US as an example. The results show that over 93% of new containers are put into use in China while 63% of old containers are scrapped in Europe or the US, and 73% of containers used for packing cargoes from China to the US are those at the Decline Stage or the Exit Stage.