管式段塞流捕集器构造及其优化设计

天然气近年来由于技术的进步及其自身多项优势而被广泛利用,油气混输作为一种经济性良好的运输方式也开始服务于各大油气田。然而多相流的运动很复杂,加上一些其他因素而产生的段塞流则是危害较大,其主要危害体现在各项参数不稳,混输管路下游的处理设备会受到较大冲击,因此需要在混输管路末端设置段塞流捕集器来缓解这种冲击,保证下游的稳定供给。     

部分预应力砼构件按两类极限状态的直接设计

本文提出了部分预应力砼构件基于两类极限状态直接控制的设计方法,并给出了具体的设计公式和设计步骤。同时,还对预应力砼超静定结构中的部分预应力砼构件的设计方法进行了说明。本文方法基本属一次性设计且具有较为经济的特点。     

Peer responses to a team's weakest link: A test and extension of LePine and Van Dyne's model.

This article reports research intended to assess and extend a recent theory of peer responses to low-performing team members (J. A. LePine & L. Van Dyne, 2001a). An instrument that assesses 4 types of peer responses to low performers (compensating for, training, motivating, and rejecting) was developed and then cross-validated in a subsequent study. Results of the study supported the validity of the peer responses measure and were generally consistent with the attributional theory of peer responses. Low-performer characteristics influenced the peer responses. These effects were mediated in part by peer attributions, affect, and cognitions, which explained variance in the peer responses over and above the variance explained by respondents' personality characteristics (i.e., The Big Five). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

New members and associates of the American Psychological Association.

The APA Membership Committee announces that the 1,838 persons listed here were elected to initial membership in the American Psychological Association as of January 1, 1985. Of these, 1,392 were elected as Members, and 446 as Associate members. Though not all of them have validated their election by payment of initial dues, all but a few will eventually do so. In addition, in accordance with Article II, Section 8, of the Bylaws, 316 Associate members were transferred to Member status as of January 1, 1985. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

灯泡贯流式机组发电机冷却装置技术改造方式的探讨

灯泡贯流式发电机组直径小,转速低,发电机的通风冷却是一个难点。通过对京南、马骝滩、石面坦及南津渡等水电站的发电机运行过程中出现的温升过高,定子线棒绝缘受损等问题的分析,提出了解决的措施与改进方案,并对灯泡贯流式机组冷却系统的设计提出了建议,可供参考和借鉴。     

PTC预应力管桩在软土地基处理中的施工工艺

结合PTC预应力管桩在沪宁高速公路扩建工程中的应用，从路基底板的施工、PTC预应力管桩的施工方面对其施工工艺进行了介绍，总结了PTC预应力管桩在软土地基处理中的应用优点。     

Upper-bound analysis of the pressure-assisted injection forging of thick-walled tubular components with hollow flanges

An upper-bound analysis of the pressure-assisted injection forging (PAIF) of thick-walled tubular components with hollow flanges was conducted to predict the maximum forming-pressure requirements. The polymeric pressurizing material and the pure aluminium work material employed were assumed to obey the von-Mises’ yield criterion, the two materials being divided into three and six zones, respectively, and described using kinematically admissible velocity fields. An upper-bound solution was derived based on this model. Experiments were conducted to validate the solution. The results suggest that the upper-bound analysis has sufficient accuracy for the prediction of the forming-pressure requirements. Subsequently, a parametric analysis was conducted to study the effects of variation of the principal parameters of the process and the geometry, such as tube thicknesses, flange dimensions and friction, on the forming-force requirements, which showed other useful applications of the upper-bound solutions.     

转炉冶炼20管坯钢生产实践

介绍了20#管坯钢的生产试验工艺，采取了拉碳法脱碳、钢包底吹氩及喂丝、保护浇铸、合理控制拉速等有效措施，解决了生产中存在的质量问题，为下一步的生产提供了理论和实践依据。     

SIMULATION OF MICROMIXING IN A TURBULENT TUBULAR REACTOR WITH CONCENTRIC FEED

Turbulence on the axis of a pipe is isotropic and homogeneous and the rate of turbulent energy dissipation, ε, is known as a function of the velocity, pipe diameter and viscosity. When, however, a concentric feed pipe is introduced (as in a reactor), the ε field does not seem to be known. Evidence from fast, mixing-controlled reactions indicates a disturbance near to and downstream from the feed pipe with an increase in ε. Because of the lack of experimental information, the radial and axial distribution of ε has been modeled. One parameter—ε at the outlet of the feedpipe—is undetermined in this model. It is shown how the radial dispersion and especially the micromixing and reaction of fluid emerging isokinetically from the feed pipe can then be calculated, using a one-dimensional, radially averaged formulation. An application to four coupled, mixing-controlled reactions is included. Simulated and measured product distributions compared satisfactorily at various concentration levels and two solution viscosities. Whereas the new model is plausible, more work is needed to understand how a feed pipe modifies the flow in its vicinity.     

螺栓球网架杆件在非节点横向荷载作用下承载力的有限元分析

运用ANSYS有限元程序 ,研究了在轴向力与非节点横向力共同作用下网架螺栓球节点杆件的受力性能 ,得出其应力分布状况及弹性极限承载力 ,并提出了螺栓球网架杆件在非节点横向力作用下承载力的计算公式。