中低产田排水除渍治理改造

对不同地点的中低产田改造的设计与施工进行尝试 ,并用静态分析法对工程效益进行了分析对比 .     

压水堆围板对堆芯物理特性的影响

应用少群中子扩散方程有限元差分计算方法，对具有围板结构的压水堆堆进行了细网的扩散计算。研究了围板厚度，材料对堆芯功率分布和有效增殖因子ｋｅｆｆ的影响。     

煤气化高温热水器防冲挡板技术改造

对多元料浆气化灰水处理系统气化高温热水器及高温热水器内防冲挡板多次冲刷损坏的原因进行初步分析,提出相应的防治方案。通过对气化高温热水器防冲挡板的技术改造,其易冲刷损坏得到有效的抑制,并针对此次改造的结果进行总结。     

瑞丰煤业超高水材料充填技术研究与应用

超高水材料充填是工作面采空区充填方式之一,论文针对瑞丰煤业1612工作面的基本情况,设计了超高水材料混合充填技术与工艺,系统地介绍了充填技术装备与组成,成功地实现了工作面运输巷沿空留巷.观测结果表明,采用高水材料充填技术,可有效避免地面沉降,保证充填效果,实现煤炭资源的最大回收.     

The role of veterinarians and feed-store vendors in the prescription and use of antibiotics on small dairy farms in rural Peru

This study aimed to describe and compare the role of veterinarians and feed-store vendors in the use of antibiotics on small dairy farms in Cajamarca, Peru, a major dairy-producing center characterized by small, rural farms with poor, mostly uneducated farmers. We used a purposive sampling strategy to recruit 12 veterinarians into 2 focus group discussions and supplemented these data with 8 semi-structured interviews with feed-store vendors. Participants reported that inappropriate antibiotic usage was widespread among their clients, which may prevent the efficient use of drugs on farms where animal disease can be devastating to the livelihood of the farmer. Participants also identified many barriers to appropriate prescribing and use, including availability of drugs, competition from other prescribers, economic constraints and habits of farmers, and limited farmer knowledge of drugs and disease. Veterinarians expressed mistrust toward nonprofessional prescribers, whereas feed-store vendors felt that veterinarians were important partners in promoting the health of their clients’ animals.     

Second‐Law Based Thermodynamic Analysis of a Novel Heat Exchanger

In the present investigation, second‐law based thermodynamics analysis was applied to a new heat exchanger with helical baffles. The helical baffles are designed as quadrant ellipses and each baffle occupies one quadrant of the cross‐section of the shell side. Experimental tests were carried out with cold water in the tube side with a constant flow rate, and hot oil on the shell side with flow rate range from 4–24 m³/h. The temperatures and pressures for the inlet and outlet of both sides were measured. The heat transfer, pressure drop, entropy generation, and exergy loss of the new heat exchanger were investigated and compared with the results for a conventional shell‐and‐tube heat exchanger with segmental baffles. The computed results indicated that both the entropy generation number and exergy losses of the new heat exchanger design are lower than those of the heat exchanger with segmental baffles, which means that the novel heat exchanger has a higher efficiency than the heat exchanger with segmental baffles, from the second‐law based thermodynamics viewpoint.     

Validation of scales measuring attitudes, self-efficacy, and intention related to smoking among middle school students.

Attitudes toward smoking, self-efficacy to avoid smoking, and smoking intention, widely cited correlates of youth smoking prevention, are often measured in large-scale youth tobacco surveys. The psychometric properties of these scales have not been well studied among middle school youth. We examined the factorial, discriminate, and convergent validity of these scales among sixth to eighth graders from a convenience sample of 22 Texas middle schools (51.2% female; 51.21% White, 32.1% Hispanic, 16.9% African American, and 8.8% Other; 67.8% nonsmokers, 21.9% experimental smokers; 3.3% former smokers; and 7.6% current smokers). Confirmatory factor analysis and invariance testing suggest that smoking attitudes, self-efficacy, and intention have evidence of construct validity in this multiethnic sample, and the scales are appropriate to assess these constructs among middle school adolescents. Additional studies are needed to establish additional evidence of validity of these constructs in other middle school samples and other subgroups (e.g. current, experimental, and former smokers). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

折流坎高度对导流洞交汇段水力特性的影响

针对竖井旋流泄洪洞与原导流洞交汇段后水流冲顶、流态紊乱的问题,结合某导流洞改建工程,通过水工模型试验,研究了不同高度折流坎对交汇段后水力特性的影响。结果表明,随着折流坎高度的降低,折流坎压强增大,最大压强均出现在上游侧;随着折流坎高度的降低,导流洞内的水流逐渐平顺;增设折流坎后,交汇段的局部水头损失降低了8.627%～15.063%,且折流坎高度降低,局部水头损失减小。综合考虑发现设计工况下体型d(折流坎高度约为1.05倍的来流水深)相对较优。研究结果可为类似工程提供参考。     

二冷喷嘴间距对连铸方坯中间裂纹的影响

某方坯连铸机生产的小方坯频繁出现中间裂纹。通过建立方坯凝固模型以及对生产过程数据的分析,研究二冷喷嘴在浇铸方向上的间距对于方坯中间裂纹的影响。研究结果表明：应根据不同的浇铸断面和钢种合理设置二冷喷嘴间距。     

EH-2中温耐硫水解催化剂与单醇精脱硫工艺

介绍了EH-2中温耐硫水解催化刑的实验室试验项目和实验数据,分析了EH-2的工厂侧流试验结果,论述了由EH-2催化刑与常温精脱硫新工艺组成的精脱硫组合技术在单醇生产中的工业应用效果。结果表明,甲醇催化刑寿命超过3年,每立方米催化剂的甲醇生产强度达到14000t。