Replacing points by compacta in neural network approximation

It is shown that cartesian product and pointwise-sum with a fixed compact set preserve various approximation-theoretic properties. Results for pointwise-sum are proved for F-spaces and so hold for any normed linear space, while the other results hold in general metric spaces. Applications are given to approximation of L_p-functions on the d-dimensional cube, 1?p<∞, by linear combinations of half-space characteristic functions; i.e., by Heaviside perceptron networks.     

9-蒽醛-（4-硝基）苯腙对氟离子高选择比色传感

合成9-蒽醛-（4-硝基）苯腙,用紫外光谱仪研究了其与阴离子识别作用。实验表明：以二氯甲烷为溶液,该受体对F-阴离子有灵敏的光谱响应,吸收光谱由422nm红移至604nm,溶液的颜色由黄色转变为蓝色,可见该受体是氟离子灵敏的比色传感试剂。     

基于Android的汽车管理系统的软件设计与实现

在ATMEGA32单片机、REB-3571LP GPS和SIEMENS TC35硬件平台下,设计了一套基于Android的便捷式汽车管理系统.该系统是以Android为软件开发平台进行设计和开发,主要功能模块包括汽车电压与油量检测、汽车控制、号码修改和密钥修改等.文章主要介绍手机端软件部分的设计与实现,以汽车定位、汽车控制、号码和密钥的修改等功能模块为例详细介绍了其实现过程.整个系统模块化设计,具有广阔的应用价值和市场前景.     

利用GSM短消息实现热计量表远程无线抄表系统的设计

针对居民供暖系统采用分户控制、分户计量之后带来的抄表问题,提出利用GSM短消息设计热计量表远程无线抄表系统的方案.给出了系统的总体设计思路以及具体的软硬件设计方案,通过该系统实现了热计量表的远程无线抄表.     

Attracting solutions in crowdsourcing contests: The role of knowledge distance,identity disclosure,and seeker status

We investigate in the context of crowdsourcing how seekers can increase open innovation performance, measured as received solver attention, by making two strategic decisions: selecting innovation tasks that are well suited for crowdsourcing and choosing between the potentials of status signalling through identity disclosure versus enjoying the benefits of anonymity. Drawing on uncertainty reduction theory, we suggest that a well-articulated problem statement reduces uncertainties of potential solvers and increases their willingness to participate. We argue that the ability of seekers to draft high-quality problem statements depends on the distance between the problem domain and their current knowledge stock. An analysis of 637 crowdsourcing projects finds that problem-seeker knowledge distance and received solver attention are curvilinear related such that moderate levels of knowledge distance maximize solver participation. However, high-status seekers who engage in identity-based status signalling are able to benefit from crowdsourcing across all levels of problem-seeker knowledge distance.     

豪也F-15A语言练习系统的管理与维护对策

语音室是外语教学的基础设施,是学生学习语言的理想环境.豪也 F-15A 型语言学习系统是基于以太网扩充技术开发,为专业听、说、读、写开发的新型语言学习系统.如何对其进行科学的管理与维护,使其充分发挥其功效是实验管理的重要环节.本文将从管理与维护中出现的问题进行探讨,并提出有效的解决对策.     

协同副词“一起”与“一齐”可替换度研究

现代汉语中协同副词“一起、一齐”使用频率较高,存在可替换的现象。采用词频统计、替换比较、综合分析等方法考察,两者的可替换度存在等级差异。这些差异的形成跟它们的语源义有关。“一齐”与“一起”之间的关系既有对立的又有交叉的,并不完全是非此即彼的。从语法化的角度对两者共时平面的差异进行解释,可以廓清它们的使用规律。     

Technology adoption,consumer inattention and heuristic decision-making: Evidence from a UK district heating scheme

This paper contributes to the debate on the energy efficiency paradox according to which consumers fail to adopt cost-effective, energy efficient technologies over less efficient technologies and therefore fail to reduce energy consumption. Both traditional and behavioural theories are used to investigate the decision-making process of residential consumers with empirical evidence based upon a specially designed quasi-experimental survey of 784 households on the decision to connect to a district-heating system, a more energy efficient alternative to individual heating systems. The results suggest an internal discount rate of around 36 per cent for homeowners, a signal that consumers undervalue future energy costs. We also find the household’s decision to be negatively affected by years of payback up to around 7–8 years. Our findings suggest that neglecting consumer inattention and heuristics can lead to biases which cast doubt on the existence of the energy efficiency paradox. We believe that these results help to explain why some consumers are unlikely to invest in energy efficient technology, particularly those on low incomes.     

中国与世界优秀女子足球队进攻能力比较分析

采用录像观察统计法、数理统计法对德国、巴西、美国、挪威及中国女足的进攻技术、战术进行了初步探讨,研究表明:前四名球队射门、定位球进攻、争顶球和传中以及运球过人等能力均较中国队表现突出,其主要原因与中国队整体进攻技战术打法不合理密切相关.     

F^-在有机合成反应中的应用

综述了氟离子作为电子供给体和非亲核性的催化剂在烷基化反应、羟醛缩合反应、Michael加成、Knoevenagel缩合反应、Wittig反应和Wittig-Horner反应、重氮化反应等有机反应中应用，并对其催化机理进行了探讨。