压气机级间引气对压气机性能影响的研究

本文研究了放气转速和不同引气量对压气机性能的影响.结果表明:压气机中间级引气在小转速范围内,使压气机流量增加的幅度较大、压比及稳定工作范围增加;大转速范围内,中间级引气使压气机流量增加幅度减小、压比下降,稳定工作范围减小.压气机存在一个使效率最高的最佳引气量.     

空气质量预报方法综述

本文介绍了常见的空气质量预报方法,如回归方法、时间序列模式、决策树法、最近邻居法、模式预报法及数值预报法,通过比较分析,认为回归方法是目前比较理想的空气质量预报方法。     

Integraph solutions of electron orbits in the Barbhausen-Kurz effect

The Continuous Integraph has been used to trace the orbits of an electron oscillating within the filament-plate space of a three-electrode vacuum tube, such oscillations being presumably the origin of the Barkhausen-Kurz Effect. The effects of space-charge, initial velocity of emission, and amplitude of oscillations are considered. The results check and extend those of Kapzov found by other methods.     

Research upon return: The effect of international mobility on scientific ties,production and impact

Highly skilled return migrants contribute to the establishment of ties between the home and host systems. This paper studies how the professional ties, which Argentinean researchers built up during the time spent in foreign research systems, influence their collaboration patterns and their research outputs upon return. It confirms the expectation that having foreign work experience helps to explain the propensity to co-publish internationally and it also shows that researchers collaborate to a higher degree with their former host system. Another central finding is that foreign work experience has a positive effect on the propensity to publish in journals with a high impact factor. Additionally, a large share of this type of research is published without international co-authorship. We therefore do no not find evidence of a lack of publication autonomy in the case of Argentinean returnees.     

计量标准的重复性和稳定性考核方法探讨

分析计量标准的稳定性和重复性,以确保计量标准传递的安全可靠。     

基于加权知识网络的组织知识存量表示与度量

对组织知识存量的表示与度量方法进行研究。在对组织知识存量结构及存储情况进行分析的基础上,提出组织知识存量的加权知识网络模型。该模型将组织知识结构表示为一个层级有向网络,并通过对边进行加权和对节点赋值来实现组织知识及各知识点存量的度量,其中节点具有两类属性值,分别用以表示组织知识在人脑中和其他各类存储媒介中的存量,边则反映了知识点之间的构成关系。同时对模型建模方法进行探讨,最后结合一个实例对方法进行验证。     

高原紫外线与臭氧空气消毒效果的比较

高原环境空气干燥，昼夜温差大，室外紫外线强。虽然空气中细菌较平原地区细菌含量少，但革兰氏阳性菌在高原环境中的生存力也比较强，引起的院内感染也不可轻视，所以在医院感染控制和管理中，空气消毒是一项重要措施。长期以来，紫外线广泛用于医院的空气消毒，起到良好的作用。     

国外科技人才国际流动问题研究演进

国际上关于科技人才国际流动的研究颇多,论文基于Web of Science数据库,应用Cite Space III软件,对国外已有的文献进行分析,欲探求国外科技人才国际流动问题研究的演进过程。通过采用共被引文献分析,提出了国外科技人才国际流动研究的三个核心领域:"人才环流"论、"人才外流"论和"人才流入"论,并分析了核心文献群体特征;通过共被引作者分析,展现了研究议题演进过程中的代表人物及其更替;通过关键词共现分析,探究该问题研究热点的演进。最后,依据国外研究热点的演进趋势,推测我国关于科技人才国际流动问题的研究热点将为人才回流和外流对我国影响的研究,包括经济影响、教育影响以及财政的影响等。     

数字贸易测度的融合比法:从构念到实测

当前,信息通信技术推动国际贸易变革,形成以数字贸易为核心的第四次全球化浪潮.衡量数字贸易规模,对于我国把握宏观经济形势,制订相关政策法规,参与全球规则制定和全球市场竞争具有重大意义.本文基于《中国商务年鉴》利用中国两化融合平台数据测算出各类数字贸易服务子项融合比,进而计算得出我国数字贸易总体规模,借以分析我国数字贸易发展现状和发展趋势,并在此基础上提出四条启示与建议:制定数字贸易发展战略规划,强化数字贸易管理机制;优化数字贸易产业结构,加快发展数字贸易核心产业;加快服务贸易数字化转型,促进服务外包与制造业融合发展;营造良好的数字治理环境,强化组织与制度创新.     

The effects of terrorist attacks on inventor productivity and mobility

We investigate the impact of deadly terrorist attacks on inventor productivity and mobility in the U.S. During the five-year window after such events, nearby firms generate fewer and less impactful inventions. Moreover, their inventors typically exhibit a post-attack decline in their patent production, unless they move to a distant company (which some tend to do after an attack). Firms' financial constraints and inventor talent appear to provide channels underlying our productivity and mobility findings, respectively. These results provide novel insights about the impact of shocks that distort the invention process and promote the mobility and reallocation of inventors among firms.     

广西某矿区CSAMT法与AMT法勘探效果对比

通过CSAMT法和AMT法在广西某矿区找矿效果研究,结合地质和钻探资料,对比了两种方法在该区深部找矿中的勘探效果。