圈闭/区带的地质风险分析

在综合研究区带与圈闭的油气存在标志和成藏机制的基础上,提出了圈闭/区带地质风险分析的具体步骤及多个钻探目标成功几率的计算公式,为圈闭/区带的地质风险分析提供了一种新的分析方法与分析思路.     

How the rich (and happy) get richer (and happier): Relationship of core self-evaluations to trajectories in attaining work success.

In this study, the authors linked core self-evaluations to job and work success. Utilizing a dynamic design from participants in the National Longitudinal Surveys of Youth (NLSY79), core self-evaluations were hypothesized to predict individuals' intercepts (starting levels of success), and their growth trajectories (slope of individuals' success over time) with respect to job satisfaction, pay, and occupational status. Results indicated that higher core self-evaluations were associated with both higher initial levels of work success and steeper work success trajectories. Education and health problems that interfere with work mediated a portion of the hypothesized relationships, suggesting that individuals with high core self-evaluations have more ascendant jobs and careers, in part, because they are more apt to pursue further education and maintain better health. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Is Modeling of Freshman Engineering Success Different from Modeling of Non‐Engineering Success?

The engineering community has recognized the need for a higher retention rate in freshman engineering. If we are to increase the freshman retention rate, we need to better understand the characteristics of academic success for engineering students. One approach is to compare academic performance of engineering students to that of non‐engineering students. This study explores the differences in predicting academic success (defined as the first year GPA) for freshman engineering students compared to three non‐engineering student sectors (Pre‐Med, STEM, and non‐STEM disciplines) within a university. Academic success is predicted with pre‐college variables from the UCLA/CIRP survey using factor analysis and regression analysis. Except for the factor related to the high school GPA and rank, the predictors for each student sector were discipline specific. Predictors unique to the engineering sector included the factors related to quantitative skills (ACT Math and Science test scores and placement test scores) and confidence in quantitative skills.     

Predictive validity of a multidisciplinary model of reemployment success.

The authors propose a multidisciplinary model of the predictors of reemployment and test its predictive validity for explaining reemployment success. Predictor variables from the fields of economics, sociology, and psychology are incorporated into the model. Reemployment success is conceptualized as a construct consisting of unemployment insurance exhaustion and reemployment speed, and for reemployed persons, job improvement, job-organization fit, and intention to leave the new job. Direct, mediated, and moderated relationships were hypothesized and tested, clarifying the role of the variables in the reemployment process and outcome. The authors' proposal and examination of a multidisciplinary model of reemployment success contributes to a literature that has not tended to adequately cross disciplinary boundaries. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effect of subclinical ketosis in early lactation on reproductive performance of postpartum dairy cows

Data generated from 796 Holstein cows enrolled in a clinical trial to investigate the health effect of a monensin controlled release capsule were analyzed to investigate the association between circulating serum β-hydroxybutyrate (BHBA) concentration in the peri-parturient period and subsequent reproductive performance. Overall, accounting for both repeated measures within cow and clustering at the herd level, non-pregnant cows after first insemination tended to have increased circulating BHBA concentrations from 3 wk before calving to 9 wk after calving relative to pregnant cows. Including the interaction between the week of sample collection and pregnancy outcome, non-pregnant cows had higher circulating BHBA concentrations in the second week after calving than cows diagnosed pregnant after first artificial insemination. Within individual weeks, cows with circulating BHBA concentrations ≥1,000 μmol/L in the first week postpartum were less likely to be diagnosed pregnant after first insemination. In the second week postpartum, the cows with circulating BHBA concentrations ≥1,400 μmol/L were significantly less likely to be pregnant after first artificial insemination. A dose response relationship was found when a comparison of the probability of pregnancy after first insemination and duration of elevated circulating ketone bodies was investigated. The probability of pregnancy was reduced by 20% in cows diagnosed subclinically ketotic in either the first or second week postpartum. Nevertheless, cows above the subclinical ketosis threshold in both the first and second week postpartum were 50% less likely to be pregnant after first insemination. Similarly, the median time to pregnancy increased in cows experiencing elevated BHBA concentrations in either (124 d) or both (130 d) the first and second week postpartum relative to cows never experiencing elevated BHBA concentrations (108 d). To further investigate this, the effect of elevated circulating BHBA was permitted to vary with time. The effect decreased with time, such that the daily probability of pregnancy increased similar to nonsubclinically ketotic cows by approximately 160 d in milk. From this analysis, both the relative circulating concentration of BHBA and the duration of elevated circulating BHBA were negatively associated with the probability of pregnancy at first service.     

An Examination of Indicators of Engineering Students' Success and Persistence

Student success and persistence within the major and university were examined through hierarchical linear and logistic regression analyses for two cohorts of engineering students. Indicators of success and persistence were based on theoretical and empirical evidence and included both cognitive and noncognitive variables. Cognitive variables included high school rank, SAT scores, and university cumulative grade point average. Noncognitive factors included academic motivation and institutional integration. Outcome variables included grade point average, enrollment at the university, and status as an engineering major. Gender differences also were evaluated. Several significant relationships among the variables were found. For instance, increased levels of motivation were significantly related to continuing in the major. Implications and directions for future research are discussed.     

多头组合秤的算法研究分析

目的 为研究不同类型算法对提高多头组合秤称重精度和称重速度的影响.方法 把动态规划算法和遗传算法应用于多头组合秤,通过对比不同数量的称量斗,2种算法在组合成功率和组合时间上的优劣,分析出最适合多头组合秤的算法.结果 动态规划算法的组合时间明显少于遗传算法的组合时间.遗传算法的组合成功率一直保持着96％以上的高水平;动态规划算法在称量斗数量少于10时的组合成功率低于90％,但随称量斗数量的增加而明显提高.结论 在少于20个称量斗的称重系统中采用遗传算法,虽然花费时间稍多,但是可以获得高组合成功率;在大于20个称量斗的称重系统中采用动态规划算法,既花费时间少,也能获得高组合成功率.     

20t上开式扇形门曲轨自动卸载箕斗

主要论述了20t上开式扇形门曲轨自动卸载箕斗的设计,大大缩短了箕斗卸载休止时间,优化了主提升系统设备配置,使提升能力大为提高,并指明上开式扇形门曲轨自动卸载箕斗正向大型化发展。     

Future criteria for success of building projects in Malaysia

Several success criteria (SC) and categorization models have been introduced and studied in the previous decades to address the issue of project success. However, most of these models have failed to align success criteria with company's success in the long-term. This paper aims at proposing a framework to categorize project success for building projects in Malaysia from the contractors' perspective. The proposed framework incorporates criteria that align the project efforts with both short and long-term goals of the companies; moreover provide an appropriate judgment of success at all stages of the project. If construction managers can judge the probability of success, they would be able to evaluate the overall relative strength of each project, and identify problems on current projects to direct them toward success.Based on the available literature, thirteen success criteria were found to be significantly and substantially related to building projects success. To develop the SC categorization framework, 151 participants, who are involved in building construction, were invited through a postal and e-mails survey to generate priorities of these criteria. The results of this study indicated that a categorization scheme for success criteria for building projects should include the categories of project management success, product success, along with market success. The findings of this study can further help future researchers seeking solutions in the challenges relating to improvement of building projects implementation and enhancement of project success.