残余应力对Si3N4/S45C连接体强度的影响

本文主要就Si3N4／S45C连接体在插入软金属及附加热循环的情况下，使残余应力发生变化，而讨论其对抗弯强度的影响．其结果为：（1）Si3N4表面边缘处的拉伸应力是影响连接体强度的主要原因．（2）抗弯强度和残余应力具有σ0＝-1．63σ＋658．1的线性关系．（2）周期性热循环对连接体的残余应力及抗弯强度有较大的影响；即发生加工硬化等使残余应力上升，产生裂纹等导致强度下降．     

RL型陶瓷高温回转式换热器的开发和应用

文章论述了陶瓷高温回转式换热器的工作原理，主要技术性能及其应用。     

A PRELIMINARY STUDY ON CRACK HEALING BEHAVIOUR OF Si3 N4 /SiC COMPOSITE CERAMICS

Ceramic (Si3 N4 /SiC) composites have been produced by sintering. From the sintered block, three point bend specimens were cut out. A semi-circular crack was made on the centre of the tension surface of the test specimen with the aid of a Vicker's indenter. The diameter of the semi-circular crack was about 60–70  μm. The specimens were subsequently heat treated at 1300°C for 1  h in vacuum, nitrogen or air. The bending strength was measured at room temperature, 800 and 1000°C. The specimens heat treated in air recovered considerably their bending strength at 1000°C, several specimens failed at a location different from the healed crack and their average strength showed the same value of that for smooth specimens. From these results, it is concluded that the recovery in bending strength of a cracked specimen was caused by crack healing.     

含稀有金属元素的陶瓷颜料和釉料──稀有金属精细化学品系列研究(Ⅱ)

扼要介绍了含稀有金属元素的陶瓷颜料和釉料的研究与开发进展，并提供多篇文献供参考。     

A note on iterative marginal optimization: a simple algorithm for maximum rank correlation estimation

The maximum rank correlation (MRC) estimator was originally studied by Han [1987. Nonparametric analysis of a generalized regression model. J. Econometrics 35, 303-316] and Sherman [1993. The limiting distribution of the maximum rank correlation estimator. Econometrica 61, 123-137] from the econometrics point of view, and most recently attracted much attention from the classification literature due to its close relationship with the receiver operating characteristics (ROC) curve [Baker, 2003. The central role of receiver operating characteristics (ROC) curves in evaluating tests for the early detection of cancer. J. Nat. Cancer Inst. 95, 511-515; Pepe, 2003. The Statistical Evaluation of Medical Tests for Classification and Prediction. Oxford University Press, Oxford; Pepe et al., 2004. Combining predictors for classification using the area under the ROC curve. University of Washington Biostatistics Working Paper Series]. Compared with its nice theoretical properties and successful applications, the MRC estimator's computational aspects are not trivial. This is because the MRC objective function is neither smooth nor continuous. Therefore, the traditional Newton-Raphson type algorithm cannot be used to find the MRC estimator. As an easy solution, we propose in this article a very simple fitting algorithm named iterative marginal optimization (IMO), which guarantees a monotone increasing of the MRC objective function at each iteration step in a very efficient manner. We show via extensive simulation that the proposed IMO algorithm is not only computationally stable but also reasonably fast. Moreover, real data about the China stock market are analyzed to further illustrate the usefulness of the proposed.     

A simple but exact method for vibration analysis of composite laminated plates with all edges simply supported and under lateral and in-plane loading

A simple but exact method of calculating the natural frequencies of vibration for some structural members with all edges simply supported and under lateral and in-plane loading, is presented herein. This method uses the deflection influence surfaces which can be obtained by any method for vibration analysis and consists of determining the deflected mode shape of the member due to the inertia force under resonance condition. Beginning with initially guessed mode shape, exact mode shape is obtained by the process similar to iteration. In this paper, equations are given for the case of special orthotropic laminates. However, the same equations can be used for any laminate as long as B₁₆, B₂₆, D₁₆, and D₂₆ are negligible as the number of plies increases and some laminates having such properties are presented.     

Electrostatic Assisted Fabrication of Porous Ceramics and Functional Fibers

A new method for fabricating porous ceramics and functional fibers was devised. In this work, fine dielectric particles, Al₂O₃, and conductive particles, LSM (Sr-doped LaMnO₃), suspended in gas phase were controlled to form chain aggregates under the action of an electrostatic field. After sintering, the chain aggregates became fiber-like, and a three-dimensional network layer of Al₂O₃ was obtained. The separation experiment of silica particles from water showed that it had good performance. This process will be simpler than the chemical vapor deposition (CVD) method because fine particles are from powder dispersion, not prepared by CVD. Furthermore, many kinds of commercial powder products can be used directly.     

Cr12和Cr12MoV模具钢特殊热处理工艺研究

介绍常用的冷作模具钢Cr12和Cr12MoV的特殊热处理及表面强化处理工艺，由于采用了最佳加工工艺，使模具寿命显著提高。     

Study of magnetic field assisted mechanochemical polishing process for inner surface of Si3N4 ceramic components: Finishing characteristics under wet finishing using distilled water

This study discusses the finishing characteristics of a magnetic field assisted mechanochemical polishing process using Cr₂O₃ abrasive mixed with magnetic particles in the case of wet finishing using distilled water, which was proposed for internal finishing of Si₃N₄ fine ceramic tubes. It was clarified that a highly accurate finishing can be achieved more efficiently in the case of wet finishing using distilled water compared with dry finishing. Moreover, those conditions necessary to achieve high efficiency finishing are discussed.     

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随着对清洁能源需求量的日益增长，天然气国际贸易量正在不断加大。远隔重洋地区的天然气贸易是依靠将天然气液化后通过船运来完成的，因而LNG船就成为了完成天然气远洋贸易的关键设备。文章回顾了LNG船的发展史，介绍了LNG船的技术特点和一些配套设施，同时还阐述了我国需要建立自己的LNG船队，从而保证我国LNG进口的重要意义。