宝钢特殊螺纹接头油管拧接的研究

ＢＧＴ１是国内首次由宝钢开发成功的特殊螺纹接头,主要用于深井和气井,其拧接实物质量与密封性能密切相关。描述了ＢＧＴ１油管拧接扭矩变化的特征,同时探讨了ＢＧＴ１拧接的控制模式,以期实现拧接质量的自动判定。     

浅谈山东秧歌“拧”在民间舞训练当中的重要作用及其如何运用发挥

本论文主要通过研究＂拧＂在胶州秧歌中所起到的重要作用作了较深刻的研究和探讨,是从一、通过胶州秧歌中＂拧＂的这一大特点,研究其作用所在;二、在胶州秧歌中,怎样训练才能使其＂拧＂在动作运动当中发挥根本的重要作用;三＂拧＂是由脚下、膝盖以及贯穿于全身而充分发挥出来的,怎样才能使其很好地发挥在动作的运动当中这三点着手开始研究的。具体是从理论和实践两方面来说,如何掌握好＂拧＂才能透彻的贯穿于整个动作与舞蹈当中,是本论文的主要论点。     

全自动钢管接箍拧接机的研制

介绍了Φ340全自动钢管接箍拧接机的主要性能参数和结构特点。该系统设备实现全自动化控制,能满足多个钢管规格的石油套管接箍与钢管的拧接,整机及关键部件已申报了国家专利。     

郑州郊区菜地氮磷在酸雨影响下流失特征研究

采用实验室人工模拟酸性降雨方法,以普通农田土壤作对比,研究郑州市惠济区常规莱地和大棚莱地土壤氮磷在酸雨影响下的流失特征.结果表明,径流中磷素浓度随着降雨时间的延长逐渐减小,氮素浓度随降雨时间变化不明显;氮素主要以颗粒态氮和硝态氮形态流失,磷素主要以颖粒态流失;大棚莱地的氮磷流失量明显大于常规菜地,常规莱地和普通农田的氮磷流失量比较接近.     

钢液脱气应用的创新性真空系统

正总部位于德国科隆的欧瑞康莱宝真空是一家拥有160多年专业生产经验的真空设备制造商,提供各类真空泵、真空计及检漏仪等设备;同时欧瑞康莱宝真空还是最佳真空解决方案的供应商。欧瑞康莱宝真空在全球拥有真空行业中最完善的销售和售后服务网络。目前,欧瑞康莱宝真空在世界各地拥有20多家销售公司和30多家维修中心,并在70多个国家设有代表机构。主要产品:旋片真空泵、罗茨泵、扩散泵、分子泵、低温     

更换阳极机构结构改造的有限元分析

更换阳极机构是铝电解工艺过程关键辅助设备的主要工具之一。在现场使用过程中,该机构拧头架常发生弯曲变形现象。通过对机构结构和动作特点分析,并利用有限元进行模拟计算,最终确定了该现象产生的根本原因。同时,根据分析结果,对机构拧头架进行了结构改造,效果显著。     

拧头架销孔加工成组治具的设计

电解车更换阳极拧头架是由联轴器轴叉、拧头、空心导套、花键轴等件组装而成,各轴叉与拧头、空心导套、花键轴之间的连接均为定位销连接。但由于各件均为回转体,其上的销孔在钻削时很难准确定心,钻孔后不能达到图纸要求,故导致装配时定位销安装困难。如果组装后配做销孔,虽然满足了安装要求,但缺少互换性。更换备件时,因其销孔制作无法与相关件匹配,导致无法使用。设计一种对拧头架上的销孔达到精准定位制作的治具,保证销孔钻削时能够达到自动定心,精准定位,从而保证质量,满足互换性要求。不仅满足现场安装要求,还提高企业信誉,间接的提高了备件的订货量。     

Φ460mm轧管机组芯棒拧接机的开发应用

介绍了全自动芯棒拧接机的主要性能参数和结构特点。该设备是集液压、气动、电气控制于一体的自动上、卸扣设备,操作简单,扭矩测量准确,夹持点多,能够实现扭矩控制、圈数控制、扭矩一圈数等多种上扣控制方式,实时显示扭矩图,实现全自动化控制,能满足多种规格芯棒的拧接。     

莱歇立磨在金冠铜业处理冰铜的应用实践

莱歇立磨是金冠铜业研磨和干燥冰铜粉的关键核心设备。介绍了莱歇立磨的结构组成及工作原理,并对莱歇立磨连续使用过程中遇到的磨辊辊套大端剥落、磨机撒料等问题进行了原因分析,在此基础上,提出了相应的解决方案,总结了冰铜磨维护要点。     

不同搅拌桨形式对稀土萃取槽内搅拌效果的影响模拟分析

搅拌桨是稀土萃取搅拌反应器最重要的辅助设备之一,不同搅拌桨类型对搅拌效果有不同影响.利用计算流体力学模拟软件--MIXSIM,对圆盘式四直叶涡轮搅拌桨及开式45 ℃折叶涡轮搅拌桨的搅拌情况进行模拟分析,得出了2种搅拌桨的搅拌混合特点及应用范围.     

Rapid Bridge Replacement under Emergency Situation: Case Study

The terrorist attack on September 11, 2001, and subsequent potential threats to the United States transportation systems have presented an urgent need to elevate the security of the transportation infrastructure and to develop emergency response plans to quickly react to the possible consequences of an extreme event. Highway bridges, as critical components of the nation’s transportation network, have been brought to closer attention by government agencies. A research project was conducted to identify strategies and technologies to restore the use of a damaged bridge quickly. One of the tasks associated with the research was to perform several case studies of previous bridge replacements following extreme events. These events include explosion and fire caused by vehicle impact, vessel collision with a bridge, and damage caused by flood and earthquake. By studying the cases, the research team seeks to identify and expand on lessons learned and address which actions did and did not work well given the circumstances of the incident. These lessons have great value to the people who need to develop and implement an emergency response plan.     

Are Psychologists Unpatriotic?

The author notes that, whether or not it is good for the advancement of a science of psychology, the psychologist has a duty to himself and to humanity to contribute far more than he has to one of the most pressing problems of our day--the problem of war and peace. Probably, there should be three types of literature about psychology and war: methodology, psychological information, and overall analyses. The production of information and idea patterns related to war and peace should not have to wait on special appropriations or special invitations to psychologists to participate. Psychologists should go to work on the problem and somehow see that their efforts find expression in publications that become widely available to those who might be interested in reading them. It would also seem reasonable to suppose that a national psychological convention would devote a major part of its time to this vital topic. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

NJTxtr—A Computer Program Based on LASER to Monitor Asphalt Segregation

Abstract: This paper describes the research funded by the New Jersey Department of Transportation to develop an automated technology to monitor segregation during construction of hot-mix asphalt concrete pavements. A Laser-based system was used to measure surface texture and to detect segregation. Two segregated test sections and a control test section were tested to evaluate the applicability of Laser texture method to detect and quantify segregation. Laser texture data were gathered from all three sections. Ratios of texture in segregated areas to that in nonsegregated areas were set as the basis for detection of different levels of segregation. By combining the level of segregation and extent of segregation, an AREA index was developed to determine the acceptability of a pavement section. Based on AREA index, pay adjustment factors were proposed to reduce the payment to account for loss of pavement life due to segregation. Further remedial actions were proposed to correct segregated pavement sections with acceptable AREA index. Based on the above concepts, Windows-based computer program NJTxtr was developed to detect and quantify segregation. This computer program uses the Laser-equipment-collected pavement texture data and determines whether the pavement section is acceptable or unacceptable based on the level of segregation within a pavement section, and provides bonus or penalties to the contractor. The paper describes a novel technology using laser and associated software for construction quality control of asphalt concrete pavements. The proposed methodology was applied to detect segregation in an interstate highway section in New Jersey, and this section was repaved based on visual observation and recommendation from this study.     

Longitudinal relationships of levels of language in writing and between writing and reading in grades 1 to 7.

Longitudinal structural equation modeling was used to evaluate longitudinal relationships across adjacent grade levels 1 to 7 for levels of language in writing (Model 1, subword letter writing, word spelling, and text composing) or writing and reading (Model 2, subword letter writing and word spelling and reading; Model 3, word spelling and reading and text composing and comprehending). Significant longitudinal relationships were observed within and across levels of language: spelling to spelling and spelling to composing (Grades 1 to 7), Models 1 and 3, and composing to spelling (Grades 3 to 6, Model 1; Grades 4 to 6, Model 3); spelling to word reading and word reading to spelling (Grades 2 to 7), Models 2 and 3; spelling to word reading (Grade 1), Model 2, and word reading to spelling (Grade 1), Model 3; composition to comprehension (Grades 3 to 5), Model 3; comprehension to composition (Grades 2 to 6), Model 3; and comprehension to word reading (Grades 1 to 6), Model 3. Results are discussed in reference to the levels of language in translating ideas into written language and integrating writing and reading. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Report of the Treasurer: 1980: Onward, financially and morally.

APA is in very good shape financially as a result of procedures and attitudes within the Council of Representatives and elsewhere in the Association's governance. We are able to maintain a balanced budget and to enjoy surpluses--though we can be certain that this will not continue forever--and at the same time to be reasonably solicitous of personal and social needs of the disadvantaged in our midst. At a time when the federal government finds it necessary to abandon or drastically cut programs to help the voiceless and other victims of our society, it is heartening to note that in our small way we psychologists are able to walk both sides of the street, that is, to help those who need our help, but to do so without imperiling our financial solvency. Despite spiraling inflation, the Association continues to produce a surplus from operations, as mandated by the Council of Representatives, while being responsive to the needs of the membership in a swiftly changing environment. In addition to the goal of building our reserves, we are dedicated to the continuation of all existing APA programs in our constant attempts to advance psychology as a science and profession and as a means of promoting human welfare. Financial statements for 1979-1981 are provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

La relation père-enfant, la nature et l’organisation des relations d’attachement.

Faithfully following the tradition of Bowlby’s theoretical framework, until recently research in developmental psychology has more often confirmed the importance of attachment to mother than to father in their children’s development. Based on this statement, Paquette (2004) proposed a different theoretical model to account for the father’s specific role in children’s development. The purpose of this review of the literature is to examine results of studies including measures of attachment to mother and to father and to answer the questions raised by different theoretical models accounting for the organization of children’s attachment relationships, that is to say hierarchy in children’s attachment to mother and to father, correspondence between the quality of these two relationships and their influence on children’s development. Whether the attachment theoretical framework seems to partially account for the specificity and the complementarity of parental roles, results of the studies reviewed in this article underline the necessity to operationalize the activation dimension of attachment relationships (Paquette, 2004) in order to better understand how children’s attachment relationships to parents do develop and how they do organize themselves to influence children’s development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Riprap Failure at Circular Bridge Piers

Riprap of bridge piers is placed to prevent scour and to secure the pier from failure. Riprap is therefore an addition to a pier to increase its performance against scour. The present research intends to present three basic scour mechanisms associated with circular-shaped bridge piers in rivers first, to introduce then a number of selected experiments for a range of hydraulic, geometric, and sedimentologic conditions, and finally to describe a novel procedure for assessing the safety of these river elements against failure. This procedure is based on the Shields diagram relating to sediment entrainment in a uniform and flat sediment bed subjected by a water flow. The Shields approach is extended for the presence of a circular-shaped pier that is protected by a circular-arranged riprap layer of equal size elements. The design procedure presented in the following thus reduces to the entrainment condition of a pier for equal riprap and the sediment sizes and to the Shields entrainment condition when the pier diameter degenerates to 0.     

Compatibility with Jet A-1 of a GCL Subjected to Freeze–Thaw Cycles

Needle-punched geosynthetic clay liner (GCL) specimens subjected to 0, 5, and 12 freeze–thaw cycles in the laboratory, and GCL specimens recovered from a composite barrier wall in the Canadian Arctic after 1 and 3 years were examined to assess the hydraulic conductivity/permeability with respect to both deionized deaired water and Jet A-l. The GCL specimens recovered from the field after 3 years had a hydraulic conductivity with respect to water that was approximately 30% less than that of the GCL specimens subjected to 12 initial freeze–thaw cycles in the laboratory, suggesting that the laboratory conditions are more severe than field conditions. The combined effects of both the freeze–thaw cycles and Jet A-l permeation increased the permeability. This increase is attributed to the creation of macropores in the GCL due to freezing and to an expansion of free-pore space due to contraction of the double layer caused by permeation of Jet A-l. Although there was an increase in permeability due to the combined effect of freeze–thaw and permeation by Jet A-l, the effect was relatively small and the results suggest that the GCL continued to exhibit good performance as a hydraulic barrier when subject to extreme climatic conditions and hydrocarbons both in the laboratory and in the field.     

Measuring Performance for Building Maintenance Providers

A building maintenance scheme was introduced in Hong Kong Housing Authority in January 2006 which employed contractors to provide inspection inside the public housing tenants’ units and arranged necessary repair works. This study aims to assess the contractor service quality performance. A method of assessment is devised based on the SERVQUAL approach to measure the public housing owner’s frontline representatives’ expectations and perceptions of the contractors’ performance. The outcome indicates that the deficiencies of service quality variables are related to the willingness of the contractors to provide prompt responses to requests from the tenants or the owner’s frontline representatives, and the availability of sufficient resources to perform the promised service dependably and accurately in terms of time, cost, and quality. The outcome of this study helps to identify the weaknesses of the contractors and allows them to properly allocate resources to those urgently needed variables. The implications from this study are considered and recommendations for industrial practices and further research are made.