医院洁净手术用房的设计和施工

提出了医院洁净手术用房的洁净等级及建设规模要与医院的医技水平及所承担的主要手术内容相适应,以保证需要、适度发展、经济适用为确定依据。依据工程学、卫生学及空气净化技术三者相结合进行系统设计、系统施工,并将室外环境污染防治工程纳入整体设计施工,按医院的总体规划合理选址。平面设计要遵循洁污分区原则,换所需洁净等级组织空气净化气流方式,净化设备系统的建筑施工及装修材料选择,要注重抗污染、防细菌滋生的质量指标。要注重微电击防护设施的设计与施工。     

水闸老化评估的专家系统方法

为了提高评估质量实现快速评估,使评估结果具有可比性,提出了一种评估水闸老化状态的专家系统方法。该方法充分利用了人类专家的实践和理论知识,并能补充一些未知信息。由于承载能力复核和评估因素计算等工作,皆由计算机来完成,从而大大提高了评估速度,人们可以很方便地使用这一评估软件。     

谈项目监理机构的工作考核

文章从加强监理单位自身建设,对派驻工程项目负责履行委托监理合同的项目监理机构如何进行工作考棱,详细阐述了意见和建议.     

The relative importance of task and contextual performance dimensions to supervisor judgments of overall performance.

Although evidence supports the unique contribution of task performance and contextual performance to overall evaluations, little is known about the relative contribution that specific dimensions of contextual performance make to overall performance judgments. This study evaluated the extent to which supervisors consider task and contextual performance by using relative weights (J. W. Johnson, 2000) to statistically describe the relative importance of specific dimensions of each type of performance to overall performance ratings. Within each of 8 job families in a large organization, each of 4 dimensions of contextual performance made not only a unique contribution but a relatively important contribution to the overall evaluation. Evidence also supports the adaptive performance dimension of handling work stress as an aspect of contextual performance and job–task conscientiousness as an aspect of both task and contextual performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The dynamics of assessment center validity: Results of a 7-year study.

The authors investigated temporal trends in the validity of an assessment center consisting of a group discussion and an analysis–presentation exercise for predicting career advancement as measured by average salary growth over a 7-year period in a sample of 679 academic graduates. The validity of the overall assessment rating for persons with tenure of 7 years, corrected for initial differences in starting salaries and restriction in range, was .39. There was a considerable time variation in the validity of both the overall assessment rating and the assessment center dimensions. In accordance with findings from research in managerial effectiveness and development, the interpersonal effectiveness dimension became valid only after a number of years, whereas the firmness dimension was predictive in the whole period and increased with time. For comparison, validity trends for 2 types of interviews and a mental test were also studied. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Characterization and application of objective pilling classification to patterned fabrics

Abstract

Previously, the authors proposed a new, simple method of frequency domain analysis based on the two-dimensional discrete wavelet transform to objectively measure the pilling intensity in sample fabric images. The method was further characterized, and the results obtained indicate that standard deviation and variance are the most appropriate measures of the dispersion of wavelet details coefficients for analysis, that the relationship between wavelet analysis scale and fabric inter-yarn pitch was empirically confirmed, and, that fabrics with random patterns do not appear to impact on the effectiveness of the analysis method.     

Air distribution in room ventilated by fabric air dispersion system

Several researches about airflow distribution in a room generated by fabric air dispersion system (FADS) were reported, but details about the simulation in computer fluid dynamics (CFD) method were not elaborated. In present work The commercial software FLUENT with standard k−ε$k-\epsilon$ turbulence model is applied to predict air distribution in a room ventilated by FADS in penetration mode, where FADS is described with the porous media model based on the modified Forchheimer equation. And more details about the simulation are given. Flow visualization near the region of FADS is conducted using dry-ice as a smoking material. The distribution of indoor air velocity and temperature and draught rating (DR) around the ankle and neck level are predicted. The simulation well matches the corresponding experimental value and results of earlier work. Results showed that air is radially discharged out in the direction perpendicular to the spatial cambered porous fibre in lower velocity, and evenly distributed along its length direction when air is distributed by FADS in penetration mode. The velocity of indoor air is very low, and the vertical air temperature difference is small (less than 2 K). DR around the ankle and neck is immune to supply air flow rate and location, which is less than the comfort limit of ASHRAE Standard 55-2004. In addition, airflow pattern is greatly impacted by the location and strength of heat load.     

数字传输接口板的机能与特性测试

文章通过对DTI数字传输接口电路的功能及动作原理的说明,着重论述了数字传输接口的机能与特性测试,并对传输线作了简要的叙述。     

增材制造复杂流道水冷电机壳体对驱动电机持续功率影响的研究

目的 提高量产铸造电机壳体的换热效率,确保电机在高功率持续工作状态下不会过热,从而提高电机的持续功率。方法 基于增材思维对电机水冷壳体的流道进行优化,改变流道形状以增大流道表面积、消除流道涡流并减小流道与内壁的间距。通过仿真分析,不断优化迭代得到最佳的流道设计方案。运用选区激光熔化（SLM）增材技术及相应的后处理工艺,制造出复杂流道结构的电机壳体。结果 采用SLM增材技术制造的AlSi10Mg铝合金壳体在x、xz、z 3个方向上的屈服强度均大于230 MPa,即使在较小壁厚的条件下,壳体强度仍满足设计要求。采用该壳体后,电机的持续功率从原量产电机的45 kW提升到50.7 kW,且仍能连续稳定运行45 min,同时电机温度未超过130℃。微观组织检测和工业CT测试结果显示,SLM电机壳体结构致密,未见气孔夹杂。该增材制造壳体的质量为6.95 kg,与量产电机壳体相比,减重约19%。结论 通过增材制造技术设计制造的电机壳体整体性能良好,可以有效提高换热效率以及电机的持续功率,并实现了电机的减重。