力比多的压抑、投射与移置——《金锁记》人物悲剧心理因素解析

弗洛伊德认为,人的性本能即"力比多"是一切本能中最基本的内容,这也是我们解读《金锁记》人物心理因素的最佳注脚。力比多的压抑和投射的失败使七巧成为被害者,而力比多的移置又使她成为加害者。     

Penalized contrast estimator for adaptive density deconvolution

The authors consider the problem of estimating the density g of independent and identically distributed variables X_I, from a sample Z₁,… Z_n such that Z_I = X_I + σ? for i = 1,…, n, and E is noise independent of X, with σ? having a known distribution. They present a model selection procedure allowing one to construct an adaptive estimator of g and to find nonasymptotic risk bounds. The estimator achieves the minimax rate of convergence, in most cases where lower bounds are available. A simulation study gives an illustration of the good practical performance of the method.     

关于一集类圆柱投影的探讨

本文所要探讨的是一集类圆柱投影。它不同于伪圆柱投影,而属于标准线型投影族的一个新类型;其中包含着两个新型的等面积投影。     

数字经济、人工智能制造与劳动力错配

文章基于2013—2019年中国30个省份的面板数据,先运用模拟退火优化投影寻踪模型测算中国数字经济发展指数,再采用双向固定效应模型和广义空间两阶段最小二乘法验证数字经济和人工智能制造对劳动力资源错配的影响效应。结果表明,2013—2019年我国数字经济发展水平整体呈现稳中有进的趋势,年均增速为11.8%。尽管数字经济发展先行区主要位于东部沿海地区,但近年来西部地区各省份年均增速较高,已形成"东部领跑,西部追赶"的空间分异格局。数字经济能显著缓解劳动力错配,人工智能制造在其中发挥着重要的中介作用,这一结论经过稳健性检验后依然成立。     

Upper Bound for p-Value of the Test of Multivariate Normal Ordered Mean Vectors Against all Alternatives

Consider the problem of testing the isotonic of several p-variate normal mean vectors against all alternatives. It is difficult to compute the exact p-value for this problem of testing with the classical method when the covariance matrices are completely unknown. In the present paper, a test statistic is proposed for this problem of testing. A reformulation of the test statistic is given based on the orthogonal projections on the closed convex cones and then the upper bound for p-value of the test statistic is computed.     

Multivariate Two-Sided Tests for Normal Mean Vectors Based on Approximations of Likelihood Ratio Test

Assuming that all components of a normal mean vector are simultaneously non negative or non positive, we consider a multivariate two-sided test for testing whether the normal mean vector is equal to zero or not. Since the likelihood ratio test is accompanied with theoretical and computational complications, we discuss two kinds of approximations of the likelihood ratio test. One is based on a conservative critical value determined by a certain inequality. The other is constructed by the approximation of the likelihood ratio test proposed by Tang et al. (1989). We compare the likelihood ratio test and two kinds of approximations through numerical examples regarding critical values and the power of the test.     

YAG投影管屏锥封接的原理与工艺

提出了利用低熔点玻璃进行ＹＡＧ投影管的ＹＡＧ屏与玻璃锥体封接的思想：分析了该封接工艺中材料膨胀系数的匹配、浸润性以及再结晶等问题;简要介绍了所用低熔点玻璃的物化性质,以及包括低熔点左玻璃膏剂调制、涂覆和焙烧在内的具体工艺规范。结果证实该封接性能良好,实现了ＹＡＧ投影管全玻结构的技术飞跃。