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The following article has been retracted due to the investigation of complaints received against it.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 The scientific community takes a very strong view on this matter and we solemnly withdrawn?the paper from the journal OJS. This paper published in OJS Vol.2 No.1, 39-47, 2012, has been retracted.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.

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。

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。

螺杆压缩机补气系统在冷链物流库中的综合利用

本文介绍了一种利用螺杆压缩机补气负荷制取低温载冷剂,为穿堂等高温度低负荷用冷场所提供冷源的工程设计经验。采用本文设计方式,单台机组可以同时为高低温两套制冷系统制冷,有效减少制冷机组数量,提高系统整体运行效率,达到降低初投资、低充注、节能减排的目的。

基于二阶边缘检测算法的随机架构设计

数字图像边缘是具有明显亮度变化的像素集合,边缘检测是识别图像边缘的最佳方法。其中,二阶边缘检测算法具有很强的边缘定位能力,但在硬件实现上需要消耗大量资源,且易受到电路的内部噪声影响。文章提出拉普拉斯(Laplace)和高斯拉普拉斯(Laplacian of Gaussian,LoG)2种常见二阶边缘检测算法的随机电路结构,并控制输入比特流的相关性来优化电路,进一步提高运行效率。实验结果表明,相比于传统的加权二进制实现,该电路消耗更少的功耗和电路面积,同时拥有更高的容错性。

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.

DEVELOPMENT AND DESIGN OF A DISASTER INFORMATION SYSTEM ON REGIONAL KARST ROCKY DESERTIFICATION

Based on a systematic analysis about the design principles, systematic objectives, clients’ demands and functional modules of the regional karst desertification disaster information system, a systematic application plan was proposed in this paper that the mainstream technologies like COMGIS, etc. can be used for secondary development, and Du’an Yao Autonomous County of Guangxi was taken as an example to illustrate the application of geographical information system in development of karst desertification disaster information system, and to provide a feasible plan for realization of accessory decision information aiming for sustainable development of karst desertification area.

段场类TOD项目规划设计方案技术要点探索

在新协同发展背景下,现有国家针对段场综合开发相关技术标准要求相对分散,难以有效系统地解决城市交通基础设施建设与城市居住区发展空间建设过程中出现的问题。为解决在段场类TOD实践过程中车辆基地与城市居住区空间发展的不匹配困境,同时避免一二级开发过程中资源重复配置,文章探讨段场类TOD实践过程中设计层面的技术逻辑及要点,依据前端政策要求、城市空间要素及技术设计要点把控及理解,通过盖上盖下集成创新互联设计,从而推动一级开发车辆基地与二级物业开发的相互联动,有效积极稳妥地促进交通基础设施与城市居住区开发合理利用及协同发展。

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.

“五育并举”理念下高职院校第二课堂课程体系建设研究

深刻领悟五育的教育理念和内涵,对于高职院校制订人才培养计划和人才培养方案有着重要作用。第二课堂作为高职院校落实育人目标的有效载体,在发展过程中出现目标指向模糊、顶层设计欠缺、评价反馈随意等问题。该文通过审视与整体设计第二课堂实施目标、课程内容、项目供给、评价机制和运行模式,建设第二课堂课程体系,探索提升人才培养成效的路径。

高等数学混合式教学的设计与实践——以离散型第二个重要极限为例

混合式教学是将线上教学与传统课堂教学相融合的新教学模式,它融合了线上、线下教学之优势,有利于提高课堂教学实效。文章以离散型第二个重要极限的讲授为例,基于高等数学的课程特点和学情分析,设计了离散型第二个重要极限的混合式课程实施方案。通过课前自主预习、课中深化学习、课后拓展,将现代信息技术与教学相融合,数学理论与实际应用相结合,课堂知识传授与价值引领相统一,实现高等数学课程教学目标。

基于二阶系统阶跃响应辨识传递函数的实验设计

二阶系统是经典控制理论课程中的重要环节。传递函数是经典控制理论中设计控制器的基础。论文中设计了一个基于二阶系统阶跃响应的传递函数辨识的matlab实验。分别针对典型二阶欠阻尼系统和过阻尼(含临界阻尼)系统进行传递函数的辨识。其中欠阻尼系统传递函数的辨识采用阶跃响应特征法,过阻尼系统传递函数的辨识采用阶跃响应y-t直线拟合法。设计了具有代表性的实验数据以及实验结果。教学实践表明,该实验在实际教学中具有良好的效果。