A1—10%Pb—钢双金属材料水平连铸复合结晶器的选用

本文从冷却速度及其对连铸复合材料组织和性能的影响的角度分析所选择的结晶器材料的适用性,在此基础上,选用了石墨结晶器外加水冷铜套的连铸复合系统来生产Al—10％Pb—钢双金属材料,并定量地给出了石墨结晶器上下型的主要尺寸。     

热膨胀对超静定轴的固有横振的频率影响

采用新的近似法研究了热膨胀对超静定轴固有横振频率的影响。     

8mm三次谐波复合腔回旋管研究

对８ｍｍ波段三次谐波复合腔回旋管进行了系统研究。对具有模式转换段的复合腔的特性进行了数值优化计算，在三次回旋谐波下，对电子注与复合腔中的场的互作用进行了非线性自洽数值模拟。设计并研制了三次谐波复合腔回旋管，在注电压Ｖｂ＝４３ｋＶ与磁场４．５ｋＧ下，得到脉冲输出动率大于５０ｋｗ，互作用电子效率为１２％的结果。     

唯一远达点和极大化序列的收敛性

本文主要讨论唯一远达点和极大化序列的收敛性，即给出如下定理：设X具（H）性质且为严格凸的Banach空间，K是X中弱M紧集，Fk(x)在X上fr■chet可微，则是X中的稠G_δ集。     

WEF全球竞争力评价体系下中美国家制度竞争力比较研究——基于WEF数据的实证分析

中国国家竞争力的提升与35年来改革开放即制度建设密不可分。改革极大地改变了我国宏观制度环境,也是促进我国制度竞争力提升进而提高我国国家竞争力水平的重要因素。文章以国家竞争力理论为基础,基于WEF建立的全球竞争力评价体系和相关数据,在对比分析中美制度竞争力发展现状和历史回顾的基础上,运用灰色关联度方法进一步对影响中美两国制度竞争力各因素的强弱、大小和次序进行实证分析,发现中国不仅在私人制度竞争力方面与美国相比差距明显,而且影响两国制度竞争力各因素的关联度也存在明显差异。     

从符号化的教师到“好教师”:困境与超越*

社会对“好教师”的呼声反衬出教师在现实境遇中的尴尬。教师职业的符号化使教师成为去身体化、去情境化和去经验化的存在,其真实生活被遮蔽。社会对他们索之过多,责之过重,职业活动边界模糊不清,他们的正常需求难以得到恰当满足和应有尊重,职业吸引力受到抑制。符号化不可能产生“好教师”。好教师只能产生于生活世界,其应对的是一个市场在资源配置中起决定性作用及注重自我决策的社会,关照的是个体对未来生活的美好预期。我们需要承认教师的具身性存在,构建友善的文化氛围和制度环境。     

Estimation of the additive hazards model with interval-censored data and missing covariates

The additive hazards model is one of the most commonly used regression models in the analysis of failure time data and many methods have been developed for its inference in various situations. However, no established estimation procedure exists when there are covariates with missing values and the observed responses are interval-censored; both types of complications arise in various settings including demographic, epidemiological, financial, medical and sociological studies. To address this deficiency, we propose several inverse probability weight-based and reweighting-based estimation procedures for the situation where covariate values are missing at random. The resulting estimators of regression model parameters are shown to be consistent and asymptotically normal. The numerical results that we report from a simulation study suggest that the proposed methods work well in practical situations. An application to a childhood cancer survival study is provided. The Canadian Journal of Statistics 48: 499–517; 2020 © 2020 Statistical Society of Canada     

Decolonising the university in 2020

ABSTRACT

We came together as editors of Decolonising the University through a commitment to understanding the university and our place within it; to examine what else might be possible for us, collectively, in the domain of higher education. Although we do not always agree about the university– or, perhaps more specifically, about the possibilities it contains for intervening effectively in the world– we nonetheless coalesced around an idea of ‘decolonising the university’ as an important strategic mode of engagement. Here, we set out the positions that we come from in relation to the broader debates about the university and its political possibilities and offer responses also to the reviews. These are not our final words on the matter, but words shaped by the political possibilities that present themselves at the outset of 2020 and which, we hope, will contribute to the increasingly necessary dialogues on this topic.     

计算知识论视域下的科学发现逻辑研究

在科学发现逻辑受制于描述性的传统研究路径，经历衰落和缓慢复苏的大背景之下，计算知识论为科学发现逻辑提供了一个全新的规范性研究框架。该框架不仅为科学发现逻辑做了系统性辩护，而且围绕发现问题的可解性做了许多规范性讨论。虽然其有关具体规范性的研究距离现实的科学发现仍然较远，但这一路径对未来发现逻辑研究走向的启发意义毋庸置疑。     

论合唱钢琴伴奏与指挥及合唱队的合作关系

作为一名合唱钢琴伴奏者,演奏技法如何服从合唱的需要,与合唱有机地紧密结合在一起,是其在伴奏过程中必须注意的.伴奏者要能够与合唱这种多声部的演唱形式默契结合,演奏应遵循合唱本身的特点,与指挥、合唱队三方合作,同时通过自身的视觉和听觉对伴奏进行控制调节,以达到完整地体现作曲家、指挥及伴奏者自身的审美意图的目的.