Hydro- and aerodynamic analysis for the design of a sailing yacht

The results of the design analysis for a sailing yacht’s hull and sails are reported. The results were used to confirm the design of a 30 ft long sloop, which was planned, designed, and built in Korea for the first time in history. Flows around a sailing yacht above and under the free surface were analyzed separately using both computational and experimental methods. For the underwater flow analysis, turbulent flow simulations with and without free surface wave effects were carried out for the canoe hull with keel/rudder. The computed drag and side forces on the hull model were compared with the measurement data obtained from the towing tank experiments. In order to assess the sail performance, another set of computations was carried out for the flow around a sail system composed of main and jib sails with a mast. The present study demonstrates that, for the design analysis of a sailing yacht, computational fluid dynamics techniques can be utilized with a reasonable level of confidence.     

Computer Predictions and Experimental Verification of Residual Stresses and Distortion in Carburizing-Quenching of Steel

IntroductionInordertoobtainimprovedmechanicalpropertiesandfatiguestrengthofmachinecomponents,stlchasgears,shaftsandsoon,carburizing-quenchingprocessasamethodofstirfacehardeningisoftenusedinindustry.Howevef,carbtirizing-quenchingisusuallyaccompaniedwithcarbonconcentrationandleadtodistortion,residualstressesandhardnessofsteelparts.Theeffectofcarboncontentisspeciallysignificantonphasetransformationbel1aviorThispaPerwillpresentthesimulationresultsoftheresidualstressfieldanddistortionofasteelcylin…     

论开发基于多层应用的铁路信息系统

介绍多层结构C/S体系结构及其优点,分析用DCOM实现三层结构分布式应用的基本解决方案,并以铁路精密统计信息系统设计为例叙述了设计过程.     

无砟轨道铁路路基沉降观测及评估

在提出无砟轨道路基沉降变形观测重要意义的基础上,从无砟轨道沉降变形观测的参建各方的职责、沉降变形观测的内容和范围、沉降变形观测的实施等方面,系统论述无砟轨道铁路路基沉降变形观测的组织、范围及方法、常用断面形式以及评估方法。     

故障录波装置在电力牵引网的应用

介绍了一种能够满足电力牵引网特殊要求的通用型故障录波装置,该装置能区分电力牵引网和普通电力系统输电线路故障,并具有故障测距和电能质量分析和记录功能。文章对装置的硬件结构、算法和主要功能、技术指标等作了分析。     

澳大利亚心理健康专科护理教育介绍

心理疾病越来越成为影响人们健康的重要因素,一项美国研究员的最新调查显示,全球大约有1%—5%的人正在严重的心理精神疾病中挣扎。在临床及社区工作中,护士在病人心理健康教育中担当着重要的角色。然而我国的心理健康专科护理教育还未启动,这严重影响了临床心理健康工作的进展。随着我国经济的发展,社会竞争压力的增大,人们对心理问题越来越重视,对心理健康服务需求日益增多,迫切需求培养合格的心理健康专科护士。发达国家已经有一套较为成熟的教育模式,本文结合笔者在澳大利亚学习期间的所闻所见,介绍一下新南威尔士州护理学院(主要进行护士继续教育的学院)心理健康专科护士培养体系,也许能给我国的护理教育提供一些借鉴。1澳大利亚心理健康护理教育简介澳洲心理健康专科护理教育属于护士的继续教育。护士接受本科教育或相当于本科学历教育后获得国家注册护士资格证,符合招生条件的情况下,可以参加研究生学习。研究生教育包括研究生证书教育(Graduate certificate,一般1年完成)、研究生文凭教育(Graduate d iploma,一般2年完成)、研究生学位(Master degree,一般3年完成)、博士教育。研究生证书教育是专科护理教育最...     

车门35C制动器结构、原理及典型故障分析

车门锁闭装置是车门系统的关键安全部件,锁闭可靠对运营安全具有非常重要的影响。广州地铁5号线列车客室车门制动器采用35C制动器,该型制动器在广州地铁4号线列车上表现稳定、可靠,但在5号线运营过程中出现问题较多,介绍该制动器结构、工作原理,并结合典型故障分析该制动器的优缺点。     

广州地铁三号线北延车辆制动力管理与分配设计

文章主要介绍了广州地铁三号线北延车辆制动力的管理与分配设计。并简述了采用此管理和分配方式的理由和优势。     

暗挖车站采用新构筑法设计方案

以沈阳地铁10号线东北大马路站暗挖段为例,提出了一种新的暗挖施工方法一新构筑法。该施工方法通过引入大直径钢管混凝土支护体系,在车站覆土及断面形式均与明（盖）挖车站相当的情况下实现暗挖施工,是对传统暗挖施工方法的重大改进。对该施工方法的设计方案进行了详细的论述,并通过计算分析对设计方案进行验证。该施工方法可避免暗挖端厅车站的出现,具有广泛的应用前景。     

Stereovision-based real-time occupant classification system for advanced airbag systems

Occupant classification in a passenger seat is one of the critical components for any advanced airbag system. Many automotive electronic suppliers and engineers predict that the camera will be the next generation sensor for active and passive safety systems because it has several advantages compared to other sensors. The present paper describes a stereovision-based occupant classification system (OCS) and intelligent algorithm with embedded system by which triggering of the airbag deployment can be controlled. The system consists of a pair of stereo cameras and dual Digital Signal Processor (DSP): the first DSP is for the stereo matching processing, and the second is for occupant classification. The results show that the reaches 97%, and the processing time is 960 ms. Such performance indicates that the feasibility of the system as an embedded OCS is high.