学术性英语书评中的态度及其人际性

在学术性书评中，态度可以通过评价性词汇、关系过程小句、受益性物质过程小句以及标点符号等明确形式实现，也可以通过虚拟语气或“虚拟语气＋比较级”等非明确形式实现。书评者往往采用明确形式来表达肯定态度，而用非明确形式来表达否定态度，主要目的在于协调书评者与读者、书作者以及出版商等各方面的关系，这表明了学术性书评中的态度具有很强的人际性。     

关于代数与数论的一些结果

在本文中我们用模型论方法证明了关于代数与数论的一些结果.     

New non-invasive photo-identification technique for free-ranging giant anteaters (Myrmecophaga tridactyla) facilitates urgently needed field studies

ABSTRACT

Pelage patterns, colouration and other biometric traits are perceived to be uniform in the Neotropical giant anteater (Myrmecophaga tridactyla), a conception precluding the identification of individuals, which is essential for field research on the little known aspects of the species’ ecology and behaviour.

Here we present a new, non-invasive technique of matrix photo-identification to identify individual giant anteaters by their natural markings. In a long-term field study in the Brazilian Pantanal, photographs of 475 giant anteater observations (396 = direct sightings, 79 = camera traps) were captured from 2010 to 2015 and considered for our analysis. Photographs were stored in a catalogue and coded in a computerised identification table, with biometric traits being categorised and described for each observed individual in a matrix. In 71% of all photographed giant anteaters, differences in pelage marking patterns, as well as other characteristics such as ear shape and scars, allowed individual recognition. We ensured consistency of the method by conducting a double-blind verification by an experienced researcher and naïve volunteers.

This simple, non-invasive method can push the level of information about life history and population structure of giant anteaters, as it applies to a large array of study designs. It can thus enhance future studies, be integrated in ongoing research projects or supply additional information out of older data sets. It is applicable to expand data collection and raise awareness in local communities, and potentially for participatory citizen science methods. Altogether these are important cornerstones for conservation actions on the species which is listed as ‘Vulnerable’ on the International Union for Conservation of Nature Red List of Threatened Species.     

矩阵张量积数值半径的一个不等式和一个等式（英文）

借助矩阵张量积和矩阵数值半径的性质,证明了不等式r（A1×…×Ak）≥∏ i=1 r（Ai）和等式r（A×B）=r（B×A）,其中A1,…,Ak,A,B∈L（U）.同时,举例说明了不等式r（k×A）≤rk（A）不成立.而当A1,…,Ak为正规阵时,有r（A1×…×Ak）=∏ i=1^ k r（As）.     

不完全判断矩阵权值的粒子群优化算法计算

不完全判断矩阵权值求解是一个重要问题。在分析不完全判断矩阵权值求解的各种方法基础上，提出以使判断矩阵的最大特征值达到最小为目标，建立求解权值准则。给出利用粒子群优化算法解决此问题，实例表明该方法比较有效。     

图书推介

物理世界奇遇记乔治·伽莫夫,罗素·斯坦纳德著,吴伯泽译,湖南教育出版社,2001年1月第1版,定价:25.60元。当之无愧的经典!这部书所阐述的科学道理大学生都能理解,但伽莫夫的故事、文笔依然令人肃然起敬。作为一部科学名著,它的地位很难被动摇。     

一种多接口视频矩阵的系统集成方案及其实现

随着视频监控应用的日益广泛,新技术和新产品不断涌现.然而,视频监控系统的建设由来已久,各个时期的产品也将继续在各自岗位上长期发挥着重要的作用.如何充分整合现有视频监控资源和局域网络资源成为人们关注的问题,文章针对不同接口的视频矩阵提出一种系统集成方案,并给出了具体的实现.     

Behaviors and interactions of strengthening and constraint for ductile Nbss matrix in Nb–Si based alloys

The ductile matrix in composites could be strengthened by incorporating brittle inclusions, while the constraint effect for matrix would become more obvious and detrimental to material toughening. The balance between strengthening and toughening was crucial to achieve excellent comprehensive mechanical properties. Upon the basis of microstructure of Nb–Si in situ composites, a unit rectangular cell containing elastic and isotropic Nb₅Si₃ particles was modeled, the Niobium solid solution (Nb_ss) matrix according with the Ramberg-Osgood constitutive relation was recognized as elastic-plastic. For Nb–Si based alloys, the effects of volume fractions of Nb₅Si₃ reinforcements, stress states and interfacial characteristics on the stress-strain field, flow localization and damage evolution were investigated by the finite element method (FEM). Further, the normalized work of rupture (χ) was calculated quantitatively as a function of volume fractions of Nb₅Si₃ phase as well as yield strength of Nb_ss matrix. These results would contribute to acquire more fundamental understanding of the strengthening and constraint effects which were exerted by Nb₅Si₃ reinforcements to ductile Nb_ss matrix, also an instructive guidance for the optimum design of Nb–Si based alloys.     

基于矩阵变换器的双馈电机控制系统的研究

本文以双馈电机作为控告l对象,基于双馈电机定子磁链定向数学模型,采用矩阵变换器作为电机励磁单元,实施空间矢量调制。建立仿真模型,选取电机转速作为最终的控制目标进行仿真,结果验证了该模型的合理性及控制策略的正确性和可行性。     

结构损伤的智能诊断

本文介绍了结构损伤的动力学原理,总结了当前流行的关于结构损伤的神经网络的一般常识,并对结构损伤检测提出了一些有益的建议.