3D打印技术在雕塑艺术创作中的应用

技术的创新总是能给实践活动带来便捷,提高实践的效率和成功率。3D打印技术的介入使雕塑艺术创作的效果有了更多的预知性、丰富了雕塑艺术创作的手段和材料,使雕塑艺术创作过程更为简单,特别是保证了雕塑家创作意图的准确实现。     

Adaptive wavelet estimation of a density from mixtures under multiplicative censoring

In this paper, a mixture model under multiplicative censoring is considered. We investigate the estimation of a component of the mixture (a density) from the observations. A new adaptive estimator based on wavelets and a hard thresholding rule is constructed for this problem. Under mild assumptions on the model, we study its asymptotic properties by determining an upper bound of the mean integrated squared error over a wide range of Besov balls. We prove that the obtained upper bound is sharp.     

Mean Time to Failure of Weighted k-out-of-n: G Systems

The purpose of this article is to develop a Monte-Carlo simulation algorithm for computing mean time to failure (MTTF) of weighted-k-out-of-n:G and linear consecutive-weighted-k-out-of-n:G systems. Our algorithm is based on the use of appropriately defined stochastic process which represents the total weight of the system at time t. These stochastic processes are explicitly defined and used along with the ordered component lifetimes to simulate MTTF of the systems with weighted components.     

浅议作为配合物配体的NO3-

本文简要的讨论了NO_3~-作为配体在形成配合物时参与配位的几种情况．     

Ethnic differences in the academic achievement process in Canada

This research examines the extent to which differences in achievement between German-speaking and French-speaking students are accounted for by theoretically related intervening variables and the extent to which the entire achievement process differs across the two ethnic groups. For the two ethnic groups, both main effects and interaction effects have significant consequences for the academic achievement process, even when a number of other variables are controlled. The results suggest that the whole process works to the benefit of the German-speaking students and to the detriment of the French-speaking students.     

近十五年西方历史学的新发展

20世纪后期,历史研究的重点继续是从分析的社会科学转移到更加强调文化因素的方面来,但是面临着迅速变化的世界局面,却具有其更加繁富且已改变了的焦点。历史学家并未受到后现代主义太多的影响,但关于应该如何重铸过去的问题的确更趋复杂了。在历史学思想与实践的重新定向过程中,人们更为深入地反思和质疑了历史作为引向今日西方文明的一种单向历程的观念,政治领域和阶级的概念扩大或改变了,妇女与性别的历史日益被纳入到通史系统中来。而在迫切需要另行考察现代性以及撰写全球史的状况面前,我们对于广泛跨文化的方法仍然缺乏综合的认知,有待于未来的进一步规划。     

中共三代领导人对台政策演进的历史启示

通过中国共产党对台湾政策经历了从“武力解放台湾”到“和平解放台湾”再到“和平统一、一国两制”的演变历程的研究,阐述了中共三代领导人对和平统一大业战略思考的逐步深化和完善,揭示了其深刻的历史启示。     

A model of the Canadian global exchange rate: A test of the 1970s

This comment points out some methodological weaknesses in the Canadian global exchange rate model and the associated efficiency tests of Marwah and Bodkin. The model is found to be inadequate for policy analysis.