赛车链条用钢化学成分设计

对赛车链条用钢的化学成分及调质后机械性能进行了研究，从而确定了适用赛车链条用钢的最佳化学成分。     

汽车钢淬透性数学模型建立

在测定 2 0CrMnTi、4 0MnBH、2 0MnVBH钢淬透性及试样的化学成分基础之上 ,利用计算机采用逐步回归分析方法进行了回归运算 ,得到淬透性与化学成分的关系———回归方程 ,根据回归方程求出了不同窄淬透带规格所对应控制的化学成分范围     

原料结构对混匀矿成分稳定性的影响

为进一步提高混匀矿化学成分的稳定性,对1999年马钢原料厂混匀矿稳定性及参加混匀的原料情况进行了分析。结果表明,原料结构与混匀矿化学成分的稳定性有密切关系。     

合金钢化学成分分析能力验证结果的评价

对合金钢的化学成分分析能力验证活动进行了总结分析,指出了检测机构在化学成分检测中普遍存在的问题,对检测机构的内部质量控制及检测水平提升有促进作用。     

H13模块锻造裂纹分析

本文通过对H13钢模块的化学成分、金相组织及硬度进行检验，对其锻造裂纹的形成原因进行了分析和讨论，得知模块的化学成分和组织偏析以及主裂纹区域沿晶分布的低熔点相是造成锻造开裂的直接原因，     

工业链条（GL）钢化学成分研究与确定

本文介绍了工业链条用钢的化学成分选择过程及实施方法，对ＭｎＴｉ钢、ＭｎＣｒ、ＭｎＶ钢进行了分析比较，最后确定出最佳的化学成分。     

赛车链条用钢化学成分设计

对赛车链条用钢的化学成分及调质后的机械性能进行了研究 ,从而确定了适用赛车链条用钢的最佳化学成分。该赛车链条的投产可创较大的经济和社会效益     

Q355B钢板化学成分和生产工艺设计

对Q345B钢板样本批次的上屈服强度以及对应化学成分进行关联性统计分析,结果表明:按照Q345B钢板化学成分和生产工艺设计生产Q355B钢板,并根据GB/T 1591-2018标准判定,上屈服强度合格率太低,工序保证能力不足,需要在Q345B钢板生产的基础上进一步优化化学成分并重新设计生产工艺。生产实践证明:采用优化后的化学成分和工艺规程生产Q355B钢板,上屈服强度合格率及工序保证能力均得到提高。     

高炉料车轮轴的断裂分析

本文对断轴进行了宏观断口检查并对化学成分、力学性能、高低倍组织及微观断口进行了分析。提出了断裂原因及防范措施。     

黄铁矿元素蛛网图成分标型方法及其在金矿床中的应用

黄铁矿是金矿床中普遍而重要的载金矿物,其主微量化学成分特征可反映大量成因信息。应用化学元素蛛网图成分标型方法对全国各典型成因类型金矿床及亚类型金矿床(胶东石英脉和蚀变岩型金矿床)主成矿期黄铁矿的化学成分特征进行了研究,结果表明:未经标准化的元素蛛网图仅仅可反映黄铁矿中化学成分的含量特征,而对于各类型金矿及亚成因类型的区分效果不理想;而经标准化的元素蛛网图则具有重要的标型特征,其标准化比值以及元素整体变化趋势均可良好区分各成因类型及亚类型金矿床。此方法的提出及其成功应用深化了金矿床黄铁矿的化学成分标型研究,并可类推至其他矿物化学成分的研究中,为金矿床类型划分及找矿标志提供重要参考。     

Study of Properties of Intermetallic Compounds of Rare Earth Metals by Artificial Neural Networks

ＹａｎＬｕ－Ｍｉｎｇ；（严六明）；ＺｈａｎＱｉａｎ－Ｂａｏ；（詹千宝）；ＱｉｎＰｅｉ；（钦佩）；ＣｈｅｎＮｉａｎ－Ｙｉ；（陈念贻）（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｌｕｒｇｙ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｓｈａｎｇｈａｉ２０００５０...     

Validity of epidemiological classification: study of asymptomatic properties of a discriminant criterion

Aiming to assess the presence of selected anaerobic microorganisms in root canals of human teeth with chronic apical periodontitis. 25 central and lateral upper incisors presenting with radiographic evidence of chronic apical periodontitis were studied. The pulp chamber was opened under aseptic conditions and samples of the root canal content were collected with sterile absorbent paper points, which were placed and dispersed in test tubes containing reduced transport medium RTT. Aliquots were dried on glass slides and stained by indirect immunofluorescence for detection of Actinomyces viscosus, Fusobacterium nucleatum, Porphyromonas gingivalis and Prevotella intermedia. The results showed a positive indirect immunofluorescence reaction in 24 of the 25 samples. Fourteen were positive for the specie Actinomyces viscosus, 12 for Prevotella intermedia, 10 for Fusobacterium nucleatum and 4 for Porphyromonas gingivalis. A semiquantitative assay was easily implemented for assessment of degree of infection by the organisms in individual cases.     

Association of enterohemorrhagic Escherichia coli hemolysin with serotypes of shiga-like-toxin-producing Escherichia coli of human and bovine origins

In this study we investigated whether the enterohemorrhagic Escherichia coli (EHEC) hemolysin gene ehxA could be used as an indicator of pathogenicity in Shiga-like-toxin-producing Escherichia coli (SLTEC) isolates. The isolates in a collection of 770 SLTEC strains of human and bovine origins were assigned to group 1 (230 human and 138 bovine SLTEC isolates belonging to serotypes frequently implicated in human disease), group 2 (85 human and 183 bovine isolates belonging to serotypes less frequently implicated in disease), and group 3 (134 bovine isolates belonging to serotypes not implicated in disease). PCR amplification was used to examine all of the SLTEC isolates for the presence of ehxA and the virulence-associated genes eae, slt-I, and slt-II. The percentages of human isolates in groups 1 and 2 that were positive for ehxA were 89 and 46%, respectively, and the percentages of bovine isolates in groups 1 to 3 that were positive for ehxA were 89, 51, and 52%, respectively. The percentages of human isolates in groups 1 and 2 that were positive for eae were 92 and 27%, respectively, and the percentages of bovine isolates in groups 1 to 3 that were positive for eae were 78, 15, and 19%, respectively. The frequencies of both ehxA and eae were significantly higher for group 1 isolates than for group 2 isolates. The presence of the ehxA gene was associated with serotype, as was the presence of the eae gene. Some serotypes, such as O117:H4, lacked both eae and ehxA and have been associated with severe disease, but only infrequently. The slt-I genes were more frequent in group 1 isolates than in group 2 isolates, and the slt-II genes were more frequent in group 2 isolates than in group 1 isolates. In a second experiment we determined the occurrence of the ehxA and slt genes in E. coli isolated from bovine feces. Fecal samples from 175 animals were streaked onto washed sheep erythrocyte agar plates. Eight E. coli-like colonies representing all of the morphological types were transferred to MacConkey agar. A total of 1, 080 E. coli isolates were examined, and the ehxA gene was detected in 12 independent strains, only 3 of which were positive for slt. We concluded that the ehxA gene was less correlated with virulence than the eae gene was and that EHEC hemolysin alone has limited value for screening bovine feces for pathogenic SLTEC because of presence of the ehxA gene in bovine isolates that are not SLTEC.     

The development of criteria of safe operation for groups.

Rejecting as inadequate accident rate data to describe the safe operation of military motor vehicle units, two evaluation devices were developed: a Safety Factors Rating calling for rating unit performance on 16 aspects of safety, and a Criterion Ranking Form requiring ranking units from "best" to "worst." Ratings and rankings were obtained for 93 units, the 16 high and 16 low units were identified, and the numbers and kinds of damages reported on Vehicle Damage Reports were compared. After adjustment for relative use, the percent damages were significantly different for all vehicle types combined, but for only one of the six vehicle categories considered. "… it is concluded that the subjective rating criterion has real validity." (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Study of race effects in objective indices and subjective evaluations of performance: A meta-analysis of performance criteria.

Used meta-analytic techniques to examine the race effect for objective measures of performance and to compare the relative effect sizes for objective indices and subjective ratings. 53 samples from both published and unpublished studies were located that included at least 1 objective index of actual performance, absenteeism, or cognitive test performance and 1 subjective measure of performance for the same group of Black and White employees. Ss were firefighters, police officers, bank tellers, skilled technicians, production workers, nurses, or clerical workers. The corrected average effect sizes across the 53 samples were low but similar for the objective ad subjective criteria. Moderating effects for the objective criteria were found, as race effects were much higher for cognitive than for performance criteria. Subjective ratings had a lower effect size than objective cognitive test scores but were higher than comparable objective performance indices. Implications for personnel research practices are discussed, and the need for a better understanding of the constructs underlying criterion measures is emphasized. (61 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effect of riddle structure on children's comprehension of riddles.

A classification of children's riddles was constructed, and 2 studies were conducted to test an implied developmental sequence of comprehension. In Exp I, riddles and jokes were collected and classified from 575 children of Grades 1–8 and Grade 10. As predicted, riddles based on conceptual tricks were most popular for the youngest Ss; riddles based on language ambiguity, for intermediate ages; and riddles based on absurdity, for the oldest groups. In Exp II, 208 Ss of Grades 1, 3, 6, 10, and college freshmen were presented with selected riddles from the 3 riddle categories to test for the predicted sequence of comprehension. Comprehension was measured by assessing the S's explanations of riddle answers and performance on a multiple-choice task. S's guesses to riddle questions and memory of the riddle answers were also recorded. Results show that explanations of the riddles were mostly justifications, in which the S demonstrated how the answer of the riddle was plausible. Ss were less likely to explain how the riddle was tricky. Guesses to the riddle questions were mostly realistic, particularly for the younger Ss. Memory of riddle answers was good for all grades, virtually perfect by Grade 6. Results show a general confirmation of the predictions for the classification. Conceptual-trick riddles were comprehended first, language ambiguity riddles at an intermediate age, and absurd riddles were comprehended only by the oldest Ss. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Self-discrepancy: Comparisons of the psychometric properties of three instruments.

In 2 studies, the psychometric properties of 3 methods for measuring real–ideal and real–ought self-discrepancies were compared: the idiographic Self-Concept Questionnaire–Personal Constructs, the nonidiographic Self-Concept Questionnaire–Conventional Constructs, and the content-free Abstract Measures. In the 1st study, 125 students at a university clinic completed the 3 instruments and measures of anxiety and depression before individual therapy. In the 2nd study, 278 undergraduates completed the 3 instruments at 2 time points 4 weeks apart and completed multiple measures of anxiety and depression at the 2nd time point. Internal consistency alphas were consistently strong for the personal construct measures (.90 to .92) and moderate to strong for the conventional construct measures (.82 to .90). Test–retest reliability coefficients were above .70 for the personal construct and conventional construct measures, but the coefficients for the latter were inflated by the stability of their error terms. The 2 discrepancies were found to be factorially distinct even though they were highly correlated. Convergent and discriminant evidence of validity was found in both studies for all measures except the abstract real–ought discrepancy. Convergence was as strong or stronger for the personal construct measures in comparison to the other measures. Test-criterion evidence of validity, with multiple measures of anxiety and depression as criteria, was found in both studies for all measures except for the abstract real–ought discrepancy in relation to anxiety. Overall, the findings support the idiographic personal construct instrument most strongly for clinical assessment and for clinical, translational, and personality research. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

时效工艺对非调质钢螺栓组织和性能的影响

研究了不同时效工艺对螺栓组织和性能的影响。采用热处理加热装置进行系列工艺试验研究时效规律,借助光学显微镜、扫描电镜、拉伸试验机等设备,分析时效工艺对材料组织及性能的影响。研究结果表明:提高时效温度和延长时效时间皆使硬度升高;适合生产的最佳时效工艺为250~300℃,2.5 h,时效工艺和表面处理工艺可以同时进行;柯氏气团、铁素体中亚晶的形成和弥散碳、氮化合物析出是时效强化的主要原因。