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111.
为解决吹塑地暖锅炉零部件在挤出吹塑成型中产生的翘曲问题,课题组利用ANSYS的POLYFLOW模块对其壁厚进行了仿真模拟研究。以吹胀压力、合模速度和型坯初始壁厚为设计变量,壁厚均匀性函数值为响应目标,通过响应面法获得较佳的工艺参数组合。结果表明对于制件壁厚影响程度:型坯初始壁厚>合模速度>吹胀压力。将仿真结果进行生产实验,所得到的制件成形效果好、壁厚较均匀。通过模拟设计有效减少了修模次数,提高了生产效率,降低了生产成本。 相似文献
112.
Colin Sumner has declared that the sociology of deviance as a research specialty was “dead? by 1975; later influential studies on norm-violating behavior appeared only in the specific area of criminology. We subjected this argument to empirical test through an analysis of the most-cited scholars and works in 263 textbooks, articles, and research notes appearing in the sociology of deviance from 1993 to 1999. We found some support for Sumner's claims: The majority of the most-cited scholars in devi-ance today conduct research in other areas, primarily in criminology. Furthermore, among the 31 most-cited works in our analysis, only two of 15 studies classified in the sociology of deviance appeared after 1975. We conclude with some thoughts about the factors that contribute to the rise and fall of research specializations in sociology. 相似文献
113.
CONVERGENCE AND PREDICTION OF PRINCIPAL COMPONENT SCORES IN HIGH-DIMENSIONAL SETTINGS 总被引:1,自引:0,他引:1
A number of settings arise in which it is of interest to predict Principal Component (PC) scores for new observations using data from an initial sample. In this paper, we demonstrate that naive approaches to PC score prediction can be substantially biased towards 0 in the analysis of large matrices. This phenomenon is largely related to known inconsistency results for sample eigenvalues and eigenvectors as both dimensions of the matrix increase. For the spiked eigenvalue model for random matrices, we expand the generality of these results, and propose bias-adjusted PC score prediction. In addition, we compute the asymptotic correlation coefficient between PC scores from sample and population eigenvectors. Simulation and real data examples from the genetics literature show the improved bias and numerical properties of our estimators. 相似文献
114.
Jean Acker Wright 《Serials Review》2013,39(1):103-104
115.
研究性学习是集研究和学习为一体的一种综合性学习方法,它着重培养学生的自学能力、合作精神及创新意识。作为文学类课程的教师,应认识研究性学习在文学类课程教学中的重要性,在文学课的教学中充分运用研究性学习来促进教学的创新,培养学生的创新能力。 相似文献
116.
美国著名的公关专家詹姆斯·格鲁尼格教授反对在公共关系中使用“形象”和“塑造形象”这两个词语 ,认为塑造形象意味着为组织说好话而无需对公众负责任。本文认为 ,公共关系是塑造形象的学问 ,而且强调塑造良好的形象必须以负责任的行为和实际的业绩为基础 相似文献
117.
莫凡 《云南民族大学学报(哲学社会科学版)》2002,19(5):35-38
成熟的国债市场 ,是一个国家金融市场的基石 ,不但为我国金融体系提供巨大的流动性资本 ,而且为全社会投资者提供了低风险的投资工具 ,同时也是央行货币政策的重要载体。本文对我国国债市场的现状与存在的问题进行了有益的探讨 ,并对国债市场化建设提出了相应的对策 相似文献
118.
The likelihood-ratio test statistic for testing homogeneity of exponential means with an ordered alternative has a rather complex null distribution. Expressions for the mean and variance of its null distribution are derived, and the accuracy of a two-moment chi-squared approximation is studied. The coefficients needed to implement the approximation are tabled. The application of these results in testing for a constant versus a nondecreasing intensity in a nonhomogeneous Poisson process is also discussed. 相似文献
119.
Generic Strategies and Business Performance: an Empirical Study of the Screw Machine Products Industry 总被引:1,自引:0,他引:1
Select businesses in industry may attempt to compete through distinct strategies. But some may be successful in adopting distinct strategic profiles while others may not prove successful. In this study it was expected that six different groups of businesses might be present in the empirical exploration – those competing successfully with the low cost strategy and those competing unsuccessfully with this strategy; those competing successfully with the differentiation strategy and those competing unsuccessfully with this strategy; and those competing successfully with low cost and differentiation strategies and those competing unsuccessfully with these strategies. The results of the investigation portray the presence of three strategic profiles. They are unsuccessful low cost businesses with the lowest performance, unsuccessful differentiated businesses with the second lowest performance, and successful businesses with combination strategies with the highest performance. 相似文献
120.
Christopher Hensley Jeremy Wright Mary Koscheski Tammy Castle Richard Tewksbury 《International Journal of Sexuality and Gender Studies》2002,7(4):293-306
Most sociologists and penologists tend to shy away from studying inmate attitudes toward homosexuality and homosexuals. Researchers within the corrections field who focus on prison sexuality typically conduct their research on consensual samesex sexual behavior and sexual coercion. The focus of the present study, however, was to ascertain female inmates' attitudes toward homosexuality and homosexuals while exploring the role ofseveral predictor variables on their attitudes. Specifically, the authors examine the relationship between female inmate homosexual behavior and attitudes toward homosexuality and homosexuals. Because of the number of items pertaining to attitudes toward homosexuality and homosexuals, factor analysis was conducted to examine whether the items measured similar constructs. Results ofthe factor analysis revealed two distinct factors/issues:civil/personal rights and personal deviance models. The mostsalient, and only statistically significant, variables in the civil/personal rights model were age, homosexual activity prior to incarceration, and homosexual activity during incarceration. Homosexual behavior during incarceration was the only statistically significant predictor of the personal deviance model. 相似文献