用电子自旋共振研究导热油的热稳定性

用电子自旋共振对国内几种典型合成油，基础油及加有添加剂的基础油，分别在不同温度下测定生成自由基的相对浓度，以及一定温度下放置一段时间自由基衰减情况，来考察导热油的热稳定性。     

几种高强度钢腐蚀疲劳裂纹扩展行为的研究

本文研究了ＧＣ－４，３０ＣｒＭｎＳｉＮｉ２Ａ和３００Ｍ超高强钢的腐蚀疲劳裂纹扩展行为。考虑了环境，热处理制度，应力比和频率对裂纹扩展的影响。研究结果表明：腐蚀环境和热处理制度对疲劳裂纹扩展有显著影响。在侵蚀性环境中随频率降低，裂纹扩展大幅度上升，随应力比提高，环境影响加剧。利用扫描电镜对试样断口形貌进行了分析，并讨论了高强钢的腐蚀疲劳机理。     

LaCrMnNiO系热敏陶瓷的微观结构控制

通过对不同配方、工艺下的ＬａＣｒＭｎＮｉＯ系热敏陶瓷的微观结构研究，指出材料的相组成对其宏观电性能的影响，并提出了通过复合工艺利用“过渡相”的形成，对材料的“最终相”加以控制的方法。文中列出了使用ＸＲＤ及ＸＰＳ手段对材料微观结构的分析结果及有关电性能的测试数据。     

On the stability preserving property of the double bilinear transformation on a class of 2-D transfer functions

This paper addresses the BIBO (bounded-input bounded-output) stability of a class of discrete 2-D quarter-plane filters in the presence of nonessential singularities of the second kind (NSSK's) on the unit bidisk. Conditions under which the double bilinear transformation (DBT) preserves stability are derived. The results presented here also extend the class of systems whose stability can be predicted. Use of the inverse DBT to produce a continuous equivalent of the discrete 2-D transfer function allows easy application of a continuous-domain equivalent of a criterion developed by Dautov. The necessary and sufficient condition for stability derived in this work provides a simple check for the class of systems under consideration. From this class of systems, it is also possible to construct stable pairs of mutually inverse transfer functions.     

热处理WO3电变色膜稳定性研究

采用电子束蒸发淀积ＷＯ３薄膜。根据已有的ＷＯ３薄膜脱水过程结论而选择适当温度对薄膜进行退火处理。在大量含水的和不含水的两类Ｌｉ＾＋电解质中进行比较性着色和消色循环实验，表明在２９０℃以下热退火处理能明显增加ＷＯ３薄膜在含水 电解质中的循环寿命。     

乙烯氧化制环氧乙烷固定床反应器的模拟及稳定性分析

在筛选出合适的乙烯氧化制环氧乙烷动力学方程的基础上,对工业固定床氧化反应器进行一维和二维模型的模拟计算。考察操作工艺参数对反应器稳定性、转化率影响的敏感性以及N_2和CH_4做致稳气时反应温度和转化率的轴向、径向分布。     

Thermal Stability of Some Metabolically Conjugated Potential Precursors of Flavor Components in Meat and Milk

The stability of selected metabolic conjugates (phenylphosphate, phenylglucuronide, naphthylglucuronide, and naphthylsulfate) was evaluated in model systems. Phenylphosphate was less stable than the glucuronides and the sulfate, especially under neutral (pH 6.8) and acidic conditions (pH 1.5). Phenylphosphate was completely degraded after 1.7 hr at 100°C, and after 0.3 hr at 150°C at pH 6.8. The glucuronide and sulfate conjugates were especially stable under neutral conditions (pH 6.8) requiring > 5 hr for complete hydrolysis at 100°C. All conjugates were quite stable to hydrolysis under alkaline conditions (pH 11). The presence of certain organic solvents (ethyl acetate or ethyl ether) caused rapid hydrolysis of conjugates under very mild conditions (40°C for 30 min). This information may improve under-standing of flavor production from animal products.     

NUMERICAL MODEL FOR DYNAMIC SIMULATION OF TRAFFIC FLOW

ＮＵＭＥＲＩＣＡＬＭＯＤＥＬＦＯＲＤＹＮＡＭＩＣＳＩＭＵＬＡＴＩＯＮＯＦＴＲＡＦＦＩＣＦＬＯＷＷｕＺｈｅｎｇ；ＺｅｎｇＬｉ－ｎｏｎｇ（ＤｅｐａｒｔｍｅｎｔＡｐｐｌｉｅｄＭｅｃｈａｎｉｃｓ，ＦｕｄａｎＵｎｉｖｅｒｓｉｔｙ，Ｓｈａｇｈａｉ２００４３３，Ｐ...     

The As-prepared surfaces of C-axis-oriented Nd1Ba2Cu3Oy thin films characterized using scanning probe microscopes

Recently, superconducting Nd₁Ba₂Cu₃O_y (Ndl23) thin films with high superconducting transition temperature (T _c) have been successfully fabricated at our institute employing the standard laser ablation method. In this paper, we report the results of surface characterization of the Nd123 thin films using an ultrahigh vacuum scanning tunneling microscope/spectroscopy (UHV-STM/STS) and an atomic force microscope (AFM) system operated in air. Clear spiral pattern is observed on the surfaces of Nd123 thin films by STM and AFM, suggesting that films are formed by two-dimensional island growth mode. Contour plots of the spirals show that the step heights of the spirals are not always the integer or half-integer number of thec-axis parameter of the structure. This implies that the surface natural termination layer of the films may not be unique. This result is supported byI-V STS measurements. The surface morphology of the Nd123 thin films is compared with that of thec-axis-oriented Y₁Ba₂Cu₃S_y thin films. Surface atomic images of the as-prepared Nd123 thin films are obtained employing both STM and AFM. STS measurements show that most of the surfaces are semiconductive. The results of STS measurements together with the fact that we are able to see the surface atomic images using scanning probe microscopes suggest that exposure to air does not cause serious degradation to the as-prepared surfaces of Nd123 thin films.     

微量Ag对CP276合金性能和组织的影响

研究添加不同含量的Ａｇ对ＣＰ２７６合金的拉伸性能和时效组织的影响。对拉伸强度、延伸率测试及透射电镜观察表明：０．１１ｗｔ％加入可促进Ｔ１相析出，使合金强度值升高；０．３５ｗｔ％Ａｇ的加入可在时效前期生成富Ａｇ、Ｍｇ的稳定的ＧＰ区，从而降低合金中Ｃｕ的固溶度，阻碍Ｔ１相析出，时效后期，ＧＰ区分解，生成大量Ｔ１相，使合金强度值显著升高。