A New Method of Construction of Robust Second Order Rotatable Designs Using Balanced Incomplete Block Designs

The following article has been retracted due to the investigation of complaints received against it. Title: A New Method of Construction of Robust Second Order Rotatable Designs Using Balanced Incomplete Block Designs Authors: Bejjam Re. Victorbabu, Kottapalli Rajyalakshmi. The above paper is a copy of Dr. Rabindra Nath Das’s former article, entitled '“Robust second order rotatable designs (Part I)”. The scientific community takes a very strong view on this matter and we solemnly withdrawn?the paper from the journal OJS. This paper published in OJS Vol.2 No.1, 39-47, 2012, has been retracted.

The Second Brother-cup Clothing Design Contest

The Second Brother Cup China International Clothing Design Contest for young designers closed on April 25, 1994, Many young dress designers from China and the United States, Canada, Italy, Germany, Britain, Greek, Finland, Belgium, Portugal, Japan, Korea, Singapore and the Philippines, as well as Hongkong and Taiwan took part Co. in the contest. From more than 500 entries, 41 designers were selected for final contest.

Neutronic design investigation of a liquid injection-based second shutdown system for a typical research reactor using MCNPX

Safety systems, built on state-of-the-art technology, are essential for achieving acceptable levels of plant safety to minimize hazards to the reactor and the general public. The second shutdown system(SSS) as an engineered safety feature and a part of the reactor protection system(RPS) is a means for rapidly shutting down a nuclear reactor, keeping it in a subcritical state and serving as a backup to the first shutdown system(FSS). In this research, one SSS with two types of optimum chamber designs is proposed that take into account the main current characteristic features of the Tehran research reactor with improvements over earlier designs. They are based on a liquid neutron absorber injection that is preferably different, diverse, and independent from the FSS based on the rod drop mechanism. The major design characteristics of this SSS with two different chambers were investigated using MCNPX 2.6.0 code. The performed calculations showed that the designed SSS is a reliable shutdown system, assuring an appropriate shutdown margin and injection time, with no significant effects on the effective delayed neutron fraction while causing minimal variations to the core structure. Further, the reasonable financial cost and the prolongation of the operation cycle are additional advantages of this design.

A New Method of Construction of Robust Second Order Slope Rotatable Designs Using Pairwise Balanced Designs

The following article has been retracted due to the investigation of complaints received against it. Title: A New Method of Construction of Robust Second Order Slope Rotatable Designs Using Pairwise Balanced Designs. Authors: Bejjam Re. Victorbabu, Kottapalli Rajyalakshmi.The paper is a copy of Dr. Rabindra Nath Das’s former article, entitled “Slope rotatability with correlated errors (Vol. 54, pp. 57-70, 2003)” and “Robust second order rotatable designs (Part I)”. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in OJSVol.2 No.3, 319-327, 2012, has been removed from this site.

On the Design of Optimal Feedback Control for Systems of Second Order

A difficult but important problem in optimal control theory is the design of an optimal feedback control, i.e., the design of an optimal control as function of the phase (state) coordinates [1,2]. This problem can be solved not often. We study here the autonomous nonlinear system of second order in general form. The constraints imposed on the control input can depend on the phase (state) coordinates of the system. The goal of the control is to maximize or minimize one phase coordinate of the considered system while other takes a prescribed in advance value. In the literature, optimal control problems for the systems of second order are most frequently associated with driving both phase coordinates to a prescribed in advance state. In this statement of the problem, the optimal control feedback can be designed only for special kind of systems. In our statement of the problem, an optimal control can be designed as function of the state coordinates for more general kind of the systems. The problem of maximization or minimization of the swing amplitude is considered explicitly as an example. Simulation results are presented.

Observer design for matrix second-order linear systems: a parametric approach

The issue of designing a type of generalized Luenberger observers for matrix second-order linear (MSOL) systems was addressed in the matrix second-order framework. By introducing the concept of stable matrix pair for MSOL systems, sufficient and necessary conditions for the design of the type of generalized Luenberger observers were given under the assumption of controllability and observability of the MSOL system. Based on the proposed conditions and the right coprime factorization of the system, a parametric approach to the design of such type of observers was presented. The proposed approach provides all the degrees of design freedom, which can be further utilized to achieve additional system specifications. A spring-mass system was utilized to show the effect of the proposed method.

基于UG平台的Machine Design View的二次开发

本文介绍了运用UGII中二次开发工具UG/OPENAPI、UIStyler及Menuscript设计三维实体软件—MachineDesignVie wer的方法,并给出了实例。

Second Life应用于教育的功能模块研究

Second Life是一个集虚拟现实技术和网络通信技术为一体的三维网络虚拟平台,因其开放性、交互性、沉浸性等特征在教育领域得到了逐渐广泛的关注。通过对Second Life的服务器架构及客户端系统进行剖析,探讨其可用于支持学习环境设计的功能模块,围绕学习环境设计的五大要素,对这些功能模块进行了基于教育实践的分析,为教育工作者利用Second Life开展虚拟学习环境建设、教学和研究提供借鉴与参考。

Factorial Designs Application to Study Enhanced Bioremediation of Soil Artificially Contaminated with Weathered Bonny Light Crude Oil through Biostimulation and Bioaugmentation Strategy

The objective of this study was designed to evaluate the effects of biostimulation and bioaugmentation amendment agents (NPK fertilizer, Tween 80 and mixed culture) on the bioremediation of tropical soil samples artificially contaminated with Weathered Bonny Light Crude Oil (WBLCO). Response Surface Methodology (RSM) with Box Behnken Design (BBD) was used with three levels and three factors of NPK fertilizer (2 - 6 g), Tween 80 (5 - 15 mg/l) and mixed culture (0.5 - 1.5 g/l) as independent variables and WBLCO removal as dependent variable (response) in a six weeks remediation period. The results showed that the rate of WBLCO removal generally increased with increase in the amount of NPK fertilizer, Tween 80 and mixed culture (biomass), respectively. A statistically significant (P < 0.0001) second-order quadratic regression model for WBLCO removal (using design-expert statistical program (v. 6.0.8)) with a coefficient of determination, R (=0.9996) was obtained. Numerical optimization technique based on desirability function was carried out to optimize the bioremediation process. The optimum values for biostimulation and bioaugmentation amendment agents to achieve a predicted maximum WBLCO removal of 84.88 percent were found to be: NPK fertilizer, 4.25 g;Tween 80, 10.22 mg/l and mixed culture, 0.46 g/l. At this optimum point, the observed WBLCO removal was found to be 83.79 percent. The statistical analyses and the closeness of the experimental results and model predictions show the reliability of the regression model and thus, biostimulation and bioaugmentation of indigenous microbial density and activity can reduce remediation period of petroleum hydrocarbon contaminated environment and subsequently the cost of remediation.

互动语言学在汉语二语教学中的应用:理论基础与实践设计

二语教学是互动语言学极有发展前景的一个研究领域。本文简要阐述了将互动语言学应用于汉语二语教学的理论基础,并结合已有研究提出互动视角下汉语二语教学实践设计的基本思路。总体来看,互动语言学能应用于汉语二语教学有三个重要的理论基础:1)二语发展以言谈互动为原始环境;2)二语习得以互动能力为终极目标;3)二语能力以社会行为表达为核心要素。在此基础上,文章提出汉语二语教学实践四点基本思路:1)开发真实自然的汉语教材;2)创设面向交际的互动语境;3)运用基于互动的教学策略;4)开发多种模态的教学资源。

Preliminary Analysis of Volt-Second Consumption on HL-2M

Prediction of volt-second consumption has been done by the tokamak simulation code （TSC）, which includes the whole plasma discharge of HL-2M conception design. It covers the volt-second consumptions at the entire current ramp-up phase and the plasma flattop phase. More important, the sensitivities of volt-second consumption with respect to the current ramp-up time and the impurity concentration have been studied, respectively.

The Comprehensive Evaluation Research of Automated Charging Station’s Lightning Protection Design in Airport

In order to inspect the good and reliability of automated charging station’s lightning protection design in airport, we set the comprehensive evaluation mathematical model of automated charging station in the airport, through the method of second order fuzzy comprehensive evaluation and evaluate the automated charging station’s lightning protection design comprehensively by using the assessment data of expert database.

单相整流器二次纹波抑制的有源功率解耦控制算法

为了解决单相整流器中LC谐振回路频率适应性差的问题,引入有源功率解耦电路代替LC谐振回路抑制母线电压二次纹波,选择直流母线电容分裂拓扑有利于减小支撑电容容值。首先,对有源功率解耦电路的工作模态进行分析,建立了单相整流器和分裂电容有源功率解耦回路数学模型。其次,传统解耦控制算法间接计算解耦参考电压,为提高功率解耦效果,采用二阶广义积分器直接提取电压纹波作为电压参考,并提出一种基于滑模观测器的无电流传感器控制策略,滑模观测器降低了解耦电路成本,提高了抗干扰能力。然后,根据整流器性能指标和功率解耦要求,给出了有源功率解耦回路电感和电容设计依据。最后,对不同拓扑结构的单相整流器进行了稳态和动态实验对比,实验结果证明了控制算法的有效性。

基于响应面法的船舶节能导管优化设计

以水动力节能装置经典伴流补偿导管为研究对象,提出利用响应面模型综合评价导管设计参数并进行优化.以导管结构特征尺寸为设计参数,建立节能导管的参数化模型.以KP505螺旋桨和节能导管耦合的水动力计算结果为响应参数,生成响应面模型.将螺旋桨效率提升比作为优化目标,将导管结构特征尺寸阈值作为约束条件,基于二阶响应面模型对导管进行结构优化设计,并对优化结果进行仿真验证,证明响应面模型的可靠性.结果表明,优化后桨-管系统的效率提升比增大了37.82%,说明利用构建的响应面模型对节能导管进行优化合理有效,可为其他类型的节能导管设计提供参考.

服务主导逻辑下垂直二手交易平台设计研究——以“多抓鱼”为例

探究提升垂直二手交易平台服务体验的设计方法。对多抓鱼平台进行案例分析,运用服务主导逻辑理论对其展开剖析。研究平台借助服务模式创新而为参与者提供的新体验。总结四项垂直二手交易平台的服务设计策略。为垂直二手交易平台提供设了计策略参考,促进了二手交易行业的可持续发展。

基于Web的B2C校园闲置物品交易系统设计与实现

传统的闲置物品交易一般都是用户面对面交易,这种交易方式效率较为低下,在耗费大量人力和物力资源的同时,用户也很难交易到满意的物品。文章针对传统交易的不足,设计了一个独立的闲置物品管理网站,方便用户进行商品的查看、交易和管理,满足用户闲置物品交易的需求。该系统采取MVC模式进行架构搭建,让前端和后端架构分离,方便系统后期的维护和管理。在开发过程中,前端主要使用JavaScript作为核心开发语言,后台利用Node.js进行数据处理,使用MongoDB作为数据库存储系统,最终实现了基于Web的B2C校园闲置物品交易系统。通过对系统各个模块进行功能性测试,各模块均能正常工作,达到系统安全稳定运行的预期目标。

无杆式高压气动弹射器弹射性能参数灵敏度分析

通过对参数进行影响规律及灵敏度分析,得到某无杆式高压气动弹射器弹射性能关键参数的优化计算参考。基于真实气体的热力学参数和动力学理论,建立了精确内弹道模型;并与弹射试验数据、流体仿真曲线进行比较分析,得到相对正确的理论计算模型;利用全局灵敏度法进行分析,得到了内弹道稳定性及离轨速度的7个主要参数影响规律及参数的线性主效应、二阶效应结果。影响内弹道稳定性的最灵敏参数为高压室容积,影响离轨速度的最灵敏参数为环境温度;泄漏率倍数及开阀时间自身的二阶主效应及与其余5个影响因素的二阶交互效应敏感度比较低,可以在设计中提前决定这2项因素的取值,实现设计变量的缩减。该文的研究结果可为内弹道及弹射装置优化提供理论参考。

基于质子重离子治疗的二次排队叫号优化流程应用

目前,越来越多的肿瘤患者选择利用质子重离子方法进行治疗。然而,普通医院排队叫号流程不满足质子重离子医院签到二次排队的要求,如何妥善安排患者建档、等候二次呼叫并减少等待时间,以及优化患者建档登记流程,成为质子重离子医院亟须解决的问题。基于此,文章提出了一种流程优化方法,包括质子重离子建档、二次排队叫号、预约系统关联取号叫号、文员登记建档等。首先,文章介绍质子重离子建档、取号、排队叫号系统的设计和架构与全流程实现方式;其次,详细阐述了全流程排队的功能和流程,并对实际应用效果进行了评估。通过使用该方法,就医环境得到了显著改善,大幅缩短了候诊时间,减少了医生的工作量,提升了患者及医生的满意度。对医院信息化建设以及患者体验来说,这一结果具有重要意义。

服务设计视角下的校园易货平台创新设计实践

本文将服务设计的理念和方法运用到大学校园的公共服务系统优化当中,旨在优化服务系统并提升用户体验。以校园易货平台为例,对校园易货系统的现状及存在的问题进行分析归纳,分析核心用户不同层次的需求,协调各方利益相关者,利用服务设计的思维和方法对现有的大学校园易货平台服务系统进行优化和再设计。提出了线上线下有机结合的校园易货平台服务系统,满足了核心用户不同层次的需求,并平衡各利益相关者在系统内部进行价值共创,实现系统的可持续发展。为校园公共服务的改进和发展、构建智慧校园提供新的思路和实践经验。

服装面料二次设计中的创意思维方法

从服装面料二次设计中原材料的选用和创意手法入手,论述了常用思维方法和各种创意思维方法在面料二次设计中的应用,指出各种创意思维方法是相互配合、互为补充的关系,只有在充分了解面料性能和服装风格的基础上,科学地综合运用多种创意思维方法,才能设计出优秀的服装面料二次设计作品。