《太平广记》与唐代阿拉伯商人的科技生活(下)——以早期伊斯兰商人为中心的考察

《太平广记》所载唐朝伊斯兰商人的科技生活虽然具有一定的传奇色彩,但是其中又确实反映了历史的真实,是那个特定历史时期伊斯兰商人现实生活的生动体现。我们透过各种扑朔迷离的"传奇"现象,不仅看到了伊斯兰商人精明的财富意识,而且更加深刻领略了他们在冶金、医药、建筑、航海、生物等多方面的博学才识和他们不畏艰难的探险精神风貌。事实上,伊斯兰商人的科技生活已经构成了唐宋文明的重要组成部分。     

企业社会责任与企业投资水平——基于企业生命周期的视角

基于利益相关者理论、代理理论和社会网络理论,以企业社会责任增加企业的投资能力和提升管理层投资意愿两方面为切入点,通过理论分析与实证检验深入研究企业社会责任对于企业投资的动态影响效应。研究发现:企业社会责任可以显著提升企业的投资水平。在对样本企业划分生命周期后发现,成长期和成熟期的企业履行社会责任能够显著增加企业投资,然而社会责任对企业投资的促进作用在衰退期企业中并不明显。     

川剧艺术家口述史(梅花奖得主卷)之古小琴篇

古小琴,女,国家二级演员,第六届中国戏剧“梅花奖”获得者,四川省川剧院演员。四川省第八届人大代表。11岁考入四川省川剧学校,主攻“青衣旦”。艺术素质好,嗓音甜美,善于用唱腔表现人物的内心世界,扮相俊美,妩媚多姿,身段流畅,表演细腻、准确。戏路较宽,基本功扎实,极富青春活力。以其独特的表演特色和塑造的各式生动人物受到广大观众的高度赞扬和喜爱。     

习近平新时代中国特色社会主义思想大众化研究——基于日常生活的维度

习近平新时代中国特色社会主义思想大众化离不开日常生活这一基础性领域,日常生活也需要新思想指导,二者之间存在着内在的逻辑关系。新思想大众化走向日常生活有着十分重要的意义。因此,在推进新思想大众化的进程中,主体须从党组织、政府、学院派等关键主体走向以群众基础主体为主的多元主体的融合,内容须从传统经典文本走向传统与日常生活内容的结合,话语从政治理论话语走向日常生活的大众话语,形式从单向的传统模式走向现代教育渠道和途径的多维互动,才能为新思想大众化营造一个良好的心理基础和前提,才能赢得广大民众的信任和支持,真正被人民大众认知、认同并自觉践行。     

权衡视角下企业社会责任行为研究

文章从权衡视角探讨了企业社会责任行为的调整机制。经验证据表明：中国上市公司社会责任投资存在极强的理性,会在外部压力、公司特征与成本之间确定最优的社会责任投资,平均的调整周期为1.460 8,这与静态权衡预期一致;风险承受能力的差别导致朝目标值的调整速度存在差异,当企业的社会责任水平高偏于最优值时,呈现出较快的调整速度,而低偏于目标社会责任时,调整速度较慢,对应的调整半周期差异为0.432 0,这与动态权衡预期一致。因此,研究的直接启示是不仅需要政策压力迫使企业履行社会责任,更需要引导利益相关者更好地进行回应,从而使企业更有动力去践行社会责任。     

1935年前后小职员的日常生活世界——以《小职员》月刊为考察中心

《小职员》月刊是1934-1935年间由小职员编辑撰稿而创造的一个想象的共同体。小职员工作的苦闷本质上来自于内心与现实之间无法弥合的落差,但小职员的业余生活是丰富多样的。面对帝国主义的威压,在中华职业教育社的宣传、共产党的组织和左翼文化的影响下,小职员逐渐将自己的日常生活联结到革命思想上。日常生活是浸润在时代思想中的,以时代思想作为参照系,去观察日常生活世界,能够极大丰富思想史和生活史研究的视野。     

Time Series Modeling of Degradation Due to Outdoor Weathering

Environmental variables have an important effect on the reliability of many products such as coatings and polymeric composites. Long-term prediction of the performance or service life of such products must take into account the probabilistic/stochastic nature of the outdoor weather. In this article, we propose a time series modeling procedure to model the time series data of daily accumulated degradation. Daily accumulated degradation is the total amount of degradation accrued within one day and can be obtained by using a degradation rate model for the product and the weather data. The fitted model of the time series can then be used to estimate the future distribution of cumulative degradation over a period of time, and to compute reliability measures such as the probability of failure. The modeling technique and estimation method are illustrated using the degradation of a solar reflector material. We also provide a method to construct approximate confidence intervals for the probability of failure.     

A Test for Constant Hazard Against a Change-Point Alternative

In this article, we consider the change-point hazard rate model which arises quite commonly in mechanical or biological systems, which experience a high hazard rate early in their lifetime due to infant mortality and then a constant or steady hazard rate after the threshold time. We first derive the corresponding mean residual life function (MRLF) and observe that the MRLF is initially increasing and then constant. Here, we derive a test statistic for exponentiality against Increasing Initially then Constant Mean Residual Life (ICMRL). We also derive the asymptotic distribution of the test statistic and compare the power of the test with other existing tests such as likelihood ratio, Weibull, and Log gamma tests considered in the literature. The test performs quite well as compared to other alternatives studied.     

On the Nonparametric Mean Residual Life Estimator in Length-biased Sampling

In this article, we discuss nonparametric estimation of a mean residual life function from length-biased data. Precisely, we prove strong uniform consistency and weak converge of the nonparametric mean residual life estimator in length-biased setting.     

Some multivariate singular unified skew-normal distributions and their application

Abstract

We introduce here the truncated version of the unified skew-normal (SUN) distributions. By considering a special truncations for both univariate and multivariate cases, we derive the joint distribution of consecutive order statistics X_{(r, ..., r + k)} = (X_(r), ..., X_{(r + K)})^T from an exchangeable n-dimensional normal random vector X. Further we show that the conditional distributions of X_{(r + j, ..., r + k)} given X_{(r, ..., r + j ? 1)}, X_{(r, ..., r + k)} given (X_(r) > t)?and X_{(r, ..., r + k)} given (X_{(r + k)} < t) are special types of singular SUN distributions. We use these results to determine some measures in the reliability theory such as the mean past life (MPL) function and mean residual life (MRL) function.