汽轮机组的保护试验研究与应用

本文论述了莱钢25MW汽轮发电机的主要结构和特点,对汽轮机运行所需的超速试验、喷油试验、低真空保护试验、汽轮机联动发电机跳闸保护试验中的试验要点及注意事项进行了介绍。     

浅谈弹簧触指尺寸对于温升试验的影响

本文在分析了弹簧触指结构、性能特点及温升试验技术要求的基础上,通过结构分析及对比温升试验,研究分析了不同尺寸弹簧触指以及弹簧触指安装槽壁厚(即散热面积)对于温升试验的影响,并根据试验数据得出结论。     

专用平车研究

本文介绍了专用平车的技术参数、主要结构特点及计算分析试验情况。     

剪力墙结构与短肢剪力墙结构分析比较

在试验资料与工程实践基础上,论述剪力墙结构与短肢剪力墙结构这两种结构形式的受力特点,并分析各自的结构计算、构造的相关问题.     

浅谈电冰箱包装底座的结构设计

在电冰箱的运输和装卸过程中,经常有箱体底部墩角现象发生,通过分析产品的结构特点和包装底座的结构特点,同时考虑到企业的经济效益,我们选择对包装底座的结构做优化改进设计,改进后的底座经过振动试验和跌落试验,各项性能指标均达到要求,证明结构优化设计取得了成功。     

短肢剪力墙设计探讨

在众多短肢剪墙结构的试验资料与工程实践基础上，论述了短肢剪力墙结构形式的受力特点，并分析了结构计算、构造的相关问题     

土木工程桁式结构受力的实验教学讨论

本文介绍了土木工程中常用的桁式结构在实验教学中的方法，对试验目的、实验方法、测试内容等方面进行了详细的介绍，该实验可以让学生对桁式结构的组构造及受力特点有更为深刻的认识。正确选择试验方法，是指导学生完成试验的关键。     

电加热式木材真空干燥设备

本文简介 ＺＧ－２２００型木材真空干燥设备的主要结构、特点及工艺试验。     

静力试验中C/SiC构件集成式热结构的声发射特性及与材料测试的对比静力试验中C/SiC构件集成式热结构的声发射特性及与材料测试的对比

在对C/SiC复合材料常温拉伸试验的损伤表征和声发射演化特性进行简要分析的基础上,针对构件集成式设计带来的复杂性特点,对某C/SiC热结构在常温静力试验中的声发射特性进行了分析。给出了试验中声发射特征参数的分类特点。根据试验加载中声发射信号规律,给出了结构的损伤演化模式。通过与材料级声发射信号的对比,判断了试验加载与热结构极限破坏载荷之间的裕度。由此将声发射测试从材料级别的研究延伸到大型C/SiC热结构。      

低温粉碎机的研制

本文阐述了低温粉碎机的结构特点，并对影响低温粉碎机性能的关键结构参数进行了试验及分析，工业性试验结果表明该机用于粉碎废旧轮胎胶是成功的。     

Preparation and adsorbing performance of calcium titanate with template method

In this paper, using furfural residue as a template, porous calcium titanate (FPCT) was prepared by a sol-gel method and characterized by XRD, SEM, and nitrogen adsorption method. The conditions of preparation were investigated. The adsorption capabilities of FPCT for heavy metal ions were studied, and the adsorption mechanism was investigated. The results show that the calcium titanate was porous, and material is composed of crystals in nanoparticle size with a small amount of calcium sulfate impurities, while the sulfuric acid in furfural residue is fixed as the calcium sulfate in the material. The adsorbed quantity is affected by the pH value of medium and time. When the pH value of medium is 5, and oscillating adsorption lasts for 30?min, the adsorbed quantities of Cd, Pb, Zn, Cu, and Ni are 118.04, 197.96, 64.98, 56.85, and 47.91?mg/g, respectively. The adsorption conforms to the Langmuir adsorption isothermal model and pseudo-second-order kinetic equation, and is a spontaneous endothermic process driven by entropy. After adsorption, adsorbents can be regenerated with 1?mol/L nitrate solution. It is used for eliminating Cd, Pb, Zn, Cu, and Ni in wastewater and the results are satisfactory.     

白藜芦醇纳米载体的制备与表征

制备了负载1%白藜芦醇（Res）的三种脂质纳米载体,分别为固体脂质纳米粒（SLN）、纳米脂质载体（NLC）和纳米乳（NE）,通过进行离心、粒径、zeta电位、pH值、含量、包封率及对温度的稳定性等理化性质研究,结果表明,Res-SLN,粒径45±5nm,zeta电位-10.0±0.3mV,含量为9.57mg.mL-1,包封率为98.68%;Res-NLC,粒径185±3nm,zeta电位-10.8±0.5mV,含量为9.17mg.mL-1,包封率为99.36%;Res-NE,粒径7nm,zeta电位-4.8±0.4mV,含量为9.89mg.mL-1,包封率为97.97%。三种载体体系在4℃及25℃离心10000r/min,30min不分层。分别在室温、4℃、40℃下放置15d,Res-NLC表现出良好的稳定性。     

Augmenting the bootstrap to analyze high dimensional genomic data

The data produced by high-throughput genomic techniques are often high dimensional and undersampled. In these settings, statistical analyses that require the inversion of covariance matrices, such as those pursuing supervised dimension reduction or the assessment of interdependence structures, are problematic. In this article we show how the idea of adding noise to the bootstrap, pioneered by Efron, and Silverman and Young, in the late seventies and eighties, can be used to overcome undersampling and effectively estimate the inverse covariance matrix for data sets in which the number of observations is small relative to the number of variables. We demonstrate the performance of this approach, which we call augmented bootstrap, on simulated data and on data derived from genomic DNA sequences and microarray experiments. This invited paper is discussed in the comments available at: , , , , , , , . This work was partially supported by NIH grant HG02238 to W. Miller, NIH grant R01-GM072264 to K. Makova, and NSF grant DMS-0704621 to R.D. Cook, B. Li and F. Chiaromonte.     

金属锂二次电池的研究进展

综述了最近几年来在改进金属锂二次电池方面进行的研究。主要论述通过加入各种不同的中剂如ＨＦ、ＣＯ２、无机离子、碘化物、有机物和表面活性剂来改善金属锂的表面和／或表面膜的结构,从而提高金属锂二次电池的电化学行为。同时对固民解质和合金负极今后的研究方向进行了展望。     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Survey of Industrial,Agricultural, and Medical Applications of Radiometric Gauging and Process Control

Photon and particle radiations (gamma rays, x rays, brems-strahlung, electrons and other charged particles, and neutrons) from radioactive isotopes, x-ray tubes, and accelerators are now widely used in gauging, production control, and other monitoring and metrology devices where avoidance of mechanical contact is desirable. The general principles of radiation gauges, which rely on detection of radiation transmitted by the sample, or on detection of scattered or other secondary radiations produced in the sample, are discussed. Examples of such devices currently used or at least shown to be feasible in industrial, transportation, building, mining, agricultural, medical, and other metrology situations are presented, drawing from a total of 146 selected technical and review paper reference sources here cited.     

Mass imagineering: Combining human imagination and automated engineering from early education to digital afterlife

Imagineering is a portmanteau combining the words imagination and engineering. The term, imagineering, was coined during the early 1940s. Since the new Millennium, imagineering has grown to the scale of a mass paradigm, because of the increasing scope and availability of automated engineering. Automated engineering is enabled by sophisticated software and artificial intelligence (AI) across the virtual-social-physical convergence (VSP) of consumer devices, desktop machines, and Web platforms. The combining of human imagination with automated engineering is enabling millions of vloggers, self-publishers and makers to imagineer at high speed and low cost. This mass imagineering can range from early education to digital afterlife. It involves makerspaces, fab labs, hackerspaces, as well as use of disparate devices, machines, and platforms “in the wild”. In this paper, three principal contributions to the literature are provided. First, mass imagineering is described from early education to digital afterlife. Second, analysis of structure and agency in mass imagineering is provided. This reveals that individual agency varies in different settings for mass imagineering, but is always more than in mass production and mass customization settings. Third, division of labour analysis of mass imagineering is provided. This reveals that mass imagineering extends labour outside of paid employment, such as in the home, towards greater self-expression and increased entrepreneurship. This is possible because of increasing automated engineering across VSP enabled by devices, machines, and platforms.     

Microwave Processing of Materials and Applications in Manufacturing Industries: A Review

The main focused aim of developing new processing and manufacturing technologies are to reduce production or manufacturing costs, processing times, and to enhance manufactured product properties. The developed processing techniques should be widely acceptable for all types of materials including metal matrix composites, ceramics, alloys, and fiber reinforced plastics. Microwave materials processing is emerging as a novel processing technology which is applicable to a wide variety of materials system including processing of MMC, FRP, alloys, ceramics, metals, powder metallurgy, material joining, coatings, and claddings. In comparison to the conventional processes, microwave processing of materials offers better mechanical properties with reduced defects and economical advantages in terms of power and time savings. The present review work focuses mainly on global developments taking place in the field of microwave processing of materials and their relevant industrial applications.     

Vendor-managed inventory: a review based on dimensions

Vendor-managed inventory (VMI) represents the methodology through which the upstream stage of a supply chain (vendor) takes responsibility for managing the inventories at the downstream stage (customer) based on previously agreed limits. VMI is another method by which supply chains can be managed, and, owing to centralised decision-making and constant information sharing, the benefits are much higher than in traditional supply chain case. However, there exists a lack of research that identifies the dimensions of VMI, benefits of VMI, methods, and levels used in the VMI environment. The focus of this paper is to explore the existing literature on VMI, to categorise it according to the criteria evaluated, and to present a systematic review. In this study, we have classified the review into three categories such as dimension-based, methodology-based, and level-based. From the thorough literature review, we have identified six dimensions of VMI: namely, inventory, transportation, manufacturing, general benefits, coordination/collaboration, and information sharing. In addition, there are, three methodological classifications: modelling, simulation, and case studies. Finally, we will consider the level-based classification. Based on the review, several recommendations that improve the performance of VMI are presented.     

Age and pedestrian injury severity in motor-vehicle crashes: a heteroskedastic logit analysis

This research explores the injury severity of pedestrians in motor-vehicle crashes. It is hypothesized that the variance of unobserved pedestrian characteristics increases with age. In response, a heteroskedastic generalized extreme value model is used. The analysis links explanatory factors with four injury outcomes: fatal, incapacitating, non-incapacitating, and possible or no injury. Police-reported crash data between 1997 and 2000 from North Carolina, USA, are used. The results show that pedestrian age induces heteroskedasticity which affects the probability of fatal injury. The effect grows more pronounced with increasing age past 65. The heteroskedastic model provides a better fit than the multinomial logit model. Notable factors increasing the probability of fatal pedestrian injury: increasing pedestrian age, male driver, intoxicated driver (2.7 times greater probability of fatality), traffic sign, commercial area, darkness with or without streetlights (2-4 times greater probability of fatality), sport-utility vehicle, truck, freeway, two-way divided roadway, speeding-involved, off roadway, motorist turning or backing, both driver and pedestrian at fault, and pedestrian only at fault. Conversely, the probability of a fatal injury decreased: with increasing driver age, during the PM traffic peak, with traffic signal control, in inclement weather, on a curved roadway, at a crosswalk, and when walking along roadway.