生命的火花分外灿烂--重评已故著名作家邓普的小说《军队的女儿》

年轻一代是社会主义祖国的未来 ,他们能否健康地成长起来 ,将老一辈手中高擎的革命红旗接过来 ,举下去 ,一起撑持到共产主义的明天 ?这关系到社会主义事业的成败。作为老一辈革命者 ,该怎样对他们进行革命人生观教育和共产主义思想教育 ,使他们在和平条件下 ,也能像在战争环境里一样健康地成长 ,是一个十分重要的问题。我区已故著名作家邓普同志的中篇小说《军队的女儿》 ,正是以特定的题材和深刻的主题 ,从侧面反映了这一现实 ,回答了这个引人深思的问题。小说通过烈士的后代刘海英在新疆军垦部队这个革命熔炉中 ,在老一辈革命者的教育和广…     

中国省域信贷风险判别分析

现阶段，商业银行信贷仍是我国社会资金配置的主要方式。出于盈利和风险考虑，商业银行信贷行为天然具有顺周期特征。为实现稳增长目标，政府更倾向于逆周期调节。受到地方财政收支状况影响，省级地方政府会采取不同方式、不同程度地干预省域资金配置。十九大报告明确指出，要健全货币政策和宏观审慎政策双支柱调控框架。因此，省域信贷风险判别是一个动态过程，需在经济周期与宏观审慎政策框架下整体考虑。在此背景下，本文基于新古典经济学分析框架，建立了2008年以来省域信贷风险识别模型，研究发现，第一，地方财政支出收入比与不良贷款率存在正向影响关系，资本回报率与不良贷款率存在负向影响关系，且地方财政支出收入比对不良贷款率的影响程度更大；第二，依据分类准则，属于信贷高风险的省域分别是：河南，海南，重庆，四川，贵州，云南，陕西，甘肃，青海，宁夏，新疆，西藏；第三，在地方财政支出收入比、资本回报率的显著作用影响下，我国各省域不良贷款率呈现U型变化，不良贷款率阈值为1.49%，即当不良贷款率大于1.49%时，省域贷款风险较高；第四，当我国资本回报率处于企稳阶段，不良贷款率处于低于阈值的谷底阶段，且省域间风险差异性较小。当我国资本回报率处于下行阶段时，不良贷款率上升至阈值线以上，且省域间风险差异性较大。     

Bayesian Bandwidth Estimation in Nonparametric Time-Varying Coefficient Models

Bandwidth plays an important role in determining the performance of nonparametric estimators, such as the local constant estimator. In this article, we propose a Bayesian approach to bandwidth estimation for local constant estimators of time-varying coefficients in time series models. We establish a large sample theory for the proposed bandwidth estimator and Bayesian estimators of the unknown parameters involved in the error density. A Monte Carlo simulation study shows that (i) the proposed Bayesian estimators for bandwidth and parameters in the error density have satisfactory finite sample performance; and (ii) our proposed Bayesian approach achieves better performance in estimating the bandwidths than the normal reference rule and cross-validation. Moreover, we apply our proposed Bayesian bandwidth estimation method for the time-varying coefficient models that explain Okun’s law and the relationship between consumption growth and income growth in the U.S. For each model, we also provide calibrated parametric forms of the time-varying coefficients. Supplementary materials for this article are available online.     

Newly deterministic construction of compressed sensing matrices via singular linear spaces over finite fields

A valuable opportunity is provided by compressed sensing (CS) to accomplish the tasks of high speed sampling, the transmission of large volumes of data, and storage in signal processing. To some extent, CS has brought tremendous changes in the information technologies that we use in our daily lives. However, the construction of compressed sensing matrices still can pose substantial problems. In this paper, we provide a kind of deterministic construction of sensing matrices based on singular linear spaces over finite fields. In particular, by choosing appropriate parameters, we constructed binary sensing matrices that are superior to existing matrices, and they outperform DeVore’s matrices. In addition, we used an embedding manipulation to merge our binary matrices with matrices that had low coherence, thereby improving such matrices. Compared with the quintessential binary matrices, the improved matrices possess better ability to compress and recover signals. The favorable performance of our binary and improved matrices was demonstrated by numerical simulations.     

茶树TRAP反应体系的建立及正交设计优化

TRAP标记技术因操作简单、重复性好、效率高等特点得到广泛应用,但该技术在茶树中的研究报道较少,且茶树TRAP-PCR体系优化尚未见报道.笔者采用正交设计的方法,对茶树TRAP-PCR反应中Mg2+、Taq酶、dNTP、固定引物、随机引物5个因素进行了优化研究,建立了茶树TRAP-PCR最佳反应体系.该20μL反应体系含有2μL 10×PCR Buffer (Mg2+ free),50 ng模板DNA,1.75 mmo/L Mg2+,0.50 U Taq酶,0.20 mmol/L dNTP,0.20 mmol/L随机引物和0.20 mmol/L固定引物.根据优化结果,利用最佳反应体系,选用16个茶树品种对TRAP标记多态性进行了初步研究.     

国际核危机及其控制——国外研究四十年述评

国际核危机严重影响了国际社会的稳定,威胁着人类社会的安全,如何认识国际核危机以及控制国际核危机是国际关系学界一个重要的研究课题.本文介绍了国外四十多年来对国际核危机及核危机控制研究的情况,分析了国外在这一领域研究的两个阶段各自的研究重点和特点,并给予了评价.     

《情史》辑评者考辨

《情史》是晚明刊刻的一部小说选评本 ,但不自署姓名 ,只用龙子犹之名作序 ,笔者留心这一问题 ,据近期发现的新材料 ,认为《情史》辑评者为冯梦龙。     

Semiparametric estimation and inference for distributional and general treatment effects

Summary.  There is a large literature on methods of analysis for randomized trials with noncompliance which focuses on the effect of treatment on the average outcome. The paper considers evaluating the effect of treatment on the entire distribution and general functions of this effect. For distributional treatment effects, fully non-parametric and fully parametric approaches have been proposed. The fully non-parametric approach could be inefficient but the fully parametric approach is not robust to the violation of distribution assumptions. We develop a semiparametric instrumental variable method based on the empirical likelihood approach. Our method can be applied to general outcomes and general functions of outcome distributions and allows us to predict a subject's latent compliance class on the basis of an observed outcome value in observed assignment and treatment received groups. Asymptotic results for the estimators and likelihood ratio statistic are derived. A simulation study shows that our estimators of various treatment effects are substantially more efficient than the currently used fully non-parametric estimators. The method is illustrated by an analysis of data from a randomized trial of an encouragement intervention to improve adherence to prescribed depression treatments among depressed elderly patients in primary care practices.     

金刚石与锯片使用性能之间的关系

根据试验研究结果和生产实践经验,把石材加工用金刚石圆锯片的性能及使用效果的诸多影响因素视为系统工程问题,分别从原材料、制造工艺与装备、锯片的合理选择和正确使用等各个方面进行了系统分析,着重分析了金刚石和金属结合剂对锯片使用性能的影响规律,指出了存在的问题和改进的途径.