晚唐五代时期金河黑河水系变迁与环境演变

汉代黑河(删丹河,或名张掖河,又名弱水)与北大河(金河,又名呼蚕水)交汇入注居延海,汉代以后直到唐代之前都没有记载.<元和郡县图志>记载两水分流,金河流注白亭海,张掖河流注居延海.敦煌文献记载晚唐时金河与张掖河交汇流注居延海,使居延海湖面出现一个恢复期.此外,金河和黑河流域地区居民结构变化、农业人口和用水量减少、黑河径流量增加也是居延海湖面增加的原因.     

从《非（国语〉》看柳宗元的历史著作观

柳宗元通过对《国语》一书中所记载的历史事件、历史现象的批驳，阐述了关于历史著作的一些观点和看法。柳宗元认为历史著作应注重内容的真实，写作内容应有所选择，应简洁，前后一致，并具有教育的功能。在一定程度上，柳宗元的历史著作观也是其经学著作观，反映了柳宗元对经学文献的看法，体现了柳宗元的经学研究观念，反映了中唐时期经学、史学的变化。柳宗元的历史著作观与其哲学观、历史观密不可分。     

Shannon Information In k-records

In this article, we present results on the Shannon information (SI) contained in upper(lower) k-record values and associated k-record times. We then establish an interesting relationship between the SI content of a random sample of fixed size, and the SI in the data consisting of sequential maxima. We also consider the information contained in the k-record data from an inverse sampling plan (ISP).     

An Improved Boxplot for Univariate Data

The boxplot is an effective data-visualization tool useful in diverse applications and disciplines. Although more sophisticated graphical methods exist, the boxplot remains relevant due to its simplicity, interpretability, and usefulness, even in the age of big data. This article highlights the origins and developments of the boxplot that is now widely viewed as an industry standard as well as its inherent limitations when dealing with data from skewed distributions, particularly when detecting outliers. The proposed Ratio-Skewed boxplot is shown to be practical and suitable for outlier labeling across several parametric distributions.     

On Comparison Of Estimates Of Dispersion Using Generalized Pitman Nearness Criterion

In this paper, estimates QP dispersion matrix and its functions are compared based on generalized Pitman nearness criterion, Various Iosa functions are considered for the purpose. Locally superior estimates are defined and obtained. Comparison of these estimates are made with other standard ones. It is snown that within certain classes, defined in the paper, these are the best estimatcrs ia the generalized Fitman nearness sense     

儒学与科技创新

儒家有重视教育、尊重知识的优良传统,可以为科技创新提供积累知识的必要的文化土壤.儒家"自强不息"、"变化日新"的精神与当代科技创新不矛盾,并且将在科技创新中表现得更加充分.科技创新将推动儒家文化的现代转换.     

聚酯(高分子)特性粘数在30℃的一点法测定研究

本工作用粘度法,在30℃测定聚酯的赫金斯(Huggins)常数以及特性粘数,并与25℃测得的特性粘数比较,结果这两种温度下测出的特性粘数值很为接近,偏差小于0.009,故聚酯在25℃的特性粘数,可以用30℃的测定结果来表示.     

Asymptotic properties of a generalized regression-type predictor of a finite population variance in probability sampling

A system of predictors for estimating a finite population variance is defined and shown to be asymptotically design-unbiased (ADU) and asymptotically design-consistent (ADC) under probability sampling. An asymptotic mean squared error (MSE) of a generalized regression-type predictor, generated from the system, is obtained. The suggested predictor attains the minimum expected variance of any design-unbiased estimator when the superpopulation model is correct. The generalized regression-type predictor and the predictor suggested by Mukhopadhyay (1990) are compared.     

On the asymptotic power and relative efficiency of the frequency X2 test

The asymptotic (Pitman) power of the X² test is investigated for particular classes of alternatives. A simple rule is introduced to identify ‘orthogonal alternatives’, for which the noncentrality parameter can be computed in a very simple way. In the sequel, restricted alternatives are considered and the ARE of the unrestricted test w.r.t. the restricted one is shown to depend only on the numbers of degrees of freedom. The concluding section discusses ‘undetectable alternatives’, i.e. alternatives for which the noncentrality vanishes.