Bibliometric mapping of computer and information ethics

This paper presents the first bibliometric mapping analysis of the field of computer and information ethics (C&IE). It provides a map of the relations between 400 key terms in the field. This term map can be used to get an overview of concepts and topics in the field and to identify relations between information and communication technology concepts on the one hand and ethical concepts on the other hand. To produce the term map, a data set of over thousand articles published in leading journals and conference proceedings in the C&IE field was constructed. With the help of various computer algorithms, key terms were identified in the titles and abstracts of the articles and co-occurrence frequencies of these key terms were calculated. Based on the co-occurrence frequencies, the term map was constructed. This was done using a computer program called VOSviewer. The term map provides a visual representation of the C&IE field and, more specifically, of the organization of the field around three main concepts, namely privacy, ethics, and the Internet.     

北京市农业发展态势及土地整治策略研究

探讨地区农业发展演变规律,是制定大都市区土地整治策略的前提条件。改革开放以来,北京市农业产业结构在市场化的导向下进行调整,其基本态势就是将生产、经济等资源转移到经济效益更好的产业或部门之中;一、二、三产业从业人员比例,由1978年的28.3∶40.1∶31.6,变为2008年的6.4∶21.1∶72.4;受城市化影响,农作物播种面积从69.1万hm~2持续下降到32.2万hm~2,但种植结构方面,粮食作物和蔬菜的播种面积一直占据着主导地位;受耕地面积的持续减少和边际生产力递减的影响,第一产业收入对农民收入的影响越来越有限。本文根据比较优势理论,分析了各区县间农业生产的综合比较优势,这也是区域土地综合整治的依据。并以发展都市型农业为目的,将农业发展与城市环境建设相结合,提出不同圈层的农地整治策略,以推进区域城乡统筹发展。     

如何在商务英语教学中提高学生的职业能力

商务英语一直是一个新颖而又复杂的专业课程,“教师如何教、学生怎样学”永远都是一个永恒而又日益更新话题。如何使商务英语专业的学生在职业素养、专业能力方面得到提高是文章的主题和初衷。文章通过分析职业能力现状．采取多种方法来提高课堂上学生学〉--j的兴趣．加强社会实用技能的训练．丰富学生校园文化活动。以此用直接、间接手段相结合的方法提高学生今后职业素养、社会适应能力．以保证未来社会岗位上学生的自我定位及超越。     

PRETCO（A级）历年部分倒装考点归纳及应对策略

部分倒装在每年的A级中占有举足轻重的地位．本文通过对历年真题中考查部分倒装的试题进行分析9-J纳．并按类别对部分倒装的用法进行逐一总结．并辅以例句．以帮助考生进一步理解巩固部分倒装这一知识点．理论联系试题及例句．从而指导考生在考试中对部分倒装试题能做到从容应对．找出相应的应对策略．各个击破。     

Complex three-dimensional high aspect ratio microfluidic network manufactured in combined PerMX dry-resist and SU-8 technology

In this paper we present a new fabrication method that combines for the first time popular SU-8 technology and PerMX dry-photoresist lamination for the manufacturing of high aspect ratio three-dimensional multi-level microfluidic networks. The potential of this approach, which further benefits from wafer-level manufacturing and accurate alignment of fluidic levels, is demonstrated by a highly integrated three-level microfluidic chip. The hereby achieved network complexity, including 24 fluidic vias and 16 crossing points of three individual microchannels on less than 13 mm(2) chip area, is unique for SU-8 based fluidic networks. We further report on excellent process compatibility between SU-8 and PerMX dry-photoresist which results in high interlayer adhesion strength. The tight pressure sealing of a fluidic channel (0.5 MPa for 1 h) is demonstrated for 150 μm narrow SU-8/PerMX bonding interfaces.     

风险投资促进了中国企业的技术创新吗？

风险投资对企业技术创新作用的研究结果呈现出多样化特征。本文选取2009-2018年间在中国创业板上市的708家企业为样本,从创新投入和创新产出视角,构建创新生产模型研究风险投资对中国企业技术创新的作用。研究发现：风险投资背景对企业创新投入和创新产出没有显著的促进作用;风险投资机构的数量对企业创新投入和创新产出有显著影响;风险投资机构的持股比例对企业创新投入和创新产出有负向作用;风险投资金额对企业创新投入有显著的促进作用,对企业创新产出则没有影响。进一步的检验揭示了研发投入对于风险投资机构数量和创新产出之间的中介效应,企业创新产出主要源于风险投资机构数量累积效应下的企业研发投入实现。研究结果表明,风险投资对中国企业的技术创新同时具有促进效应和抑制效应。     

Who gets access to fast broadband? Evidence from Los Angeles County

Regulatory and market changes in residential (fixed) broadband have raised concerns about Internet Service Providers (ISPs) prioritizing investments in the most profitable areas, thus relegating low-income and minority communities to fewer broadband options and legacy networks. This study examines these concerns for Los Angeles (LA) County during the 2014–18 period. The analysis uses rollout data collected by the California Public Utilities Commission (CPUC) in combination with demographic information from the American Community Survey (ACS). Because the spatial distribution of broadband investments cannot be directly observed, competition and the availability of FTTH services are used as proxies. The findings indicate that competition and fiber-based services are less likely in low-income areas and minority communities, with the most severe deficits observed in census block groups that combine poverty and a large share of Black residents. We outline alternative policy tools to address intracity inequalities in broadband investments in the conclusion.     

基于Android平台的资讯播报软件设计与实现

为克服因显示屏、视觉等因素造成的阅读不便,满足用户听资讯的需求,结合语音合成技术,提出基于Android平台的资讯播报软件。软件在服务器端通过RSS及其相关技术实现自动采集资讯,手机客户端运用API以及科大讯飞提供的语音SDK实现了频道订阅与资讯播报,通过HTTP协议实现手机端能即时获得订阅频道的最新资讯。实验结果表明,软件满足用户轻松愉快的阅读需求,同时具备高自然度的语音播报功能。     

三水杨醛三乙基四胺合铈(III)金属配合物的合成及其与牛血清蛋白作用研究

本文利用水杨醛和三乙基四胺合成了三水杨醛三乙基四胺配体,将配体与Ce(NO3)3·6H2O反应合成了三水杨醛三乙基四胺合铈(III)金属配合物。使用熔点法、红外光谱法、荧光光谱法以及摩尔电导率法对合成的金属配合物结构进行了初步推测。用荧光光谱法对所合成的铈(III)金属配合物与牛血清蛋白的作用进行了研究,结果表明该金属配合物可与牛血清蛋白相互作用生成复合物,在0-2.6×10-5mol/L浓度范围内有两种淬灭方式:当浓度较小时(小于1.2×10-5mol/L)以静态淬灭为主,而当浓度大于1.2×10-5mol/L时则以动态淬灭为主。     

Does evaluating peer assessment accuracy and taking it into account in calculating assessor’s final score enhance online peer assessment quality?

Education and Information Technologies - Peer assessment has an important role in teaching and learning nowadays. However, the existing techniques tend to be limited due to a lack of a suitable...