中关村企业自主创新技术标准化模式剖析及启示

标准化模式是标准化工作成功经验的总结和凝练,对标准化工作的深入开展具有重要价值。本文在研究中关村园区企业的基础上,从时间维和自主创新维的"双维度",提出了"承接-联创"、"研发-自创"、"前瞻—预创"、"引进—仿创"的中关村技术标准化的"四创"模式,并指出了标准化模式的特点、选择机制及其启示。     

A novel adaptive robust control approach for underactuated mobile robot

Underactuated mobile robot (UMR) is a typical nonlinear underactuated system with nonholonomic and holonomic constraints. Based on the model of UMR, we propose a novel adaptive robust control to control the UMR and compensate the uncertainties from the view of constraint-following. The uncertainties, which are (possibly fast) time-varying and bounded, include modeling error, initial condition deviation, friction force and other external disturbances. However, the bounds are unknown. To estimate the bounds of the uncertainties, we design an adaptive law which is of leakage type. The uniform boundedness and the uniform ultimate boundedness of the proposed control are verified by Lyapunov method. Furthermore, the effectiveness of the control is shown via numerical simulation of a case.     

大棚栽培下19个辣椒组合早期产量与效益的比较

目的:比较在大棚栽培下不同辣椒组合的早期产量与经济效益,为新品种的审定及椒农对高产高效辣椒组合的选择提供参考。方法:种植19个辣椒组合材料,采用单因素完全随机试验设计,测定其早期产量和经济效益,并对部分产量构成因子进行分析。结果:不同辣椒组合的早期产量和效益的差异达到极显著水平,绿果类组合1117×1111产量最大,其次是紫果类组合FL-2×1111PYTZR-1-2-2,产量分别达3 890.83和2 313.71kg/667m~2,效益达7 780和4 626元/667m~2。不同辣椒组合的株高等产量构成因子达到显著差异水平,产量与开展度、果实个数、果重、果宽等成显著正相关,而与株高和果长相关性不显著。结论:常规种植时优先选择绿果类辣椒组合1117×1111;特色种植时选择紫果类辣椒组合FL-2×1111PYTZR-1-2-2。     

Event triggered reliable synchronization of semi-Markovian jumping complex dynamical networks via generalized integral inequalities

This paper focuses on the synchronization problem of semi-Markovian jumping complex dynamical networks with time-varying coupling delays against actuator failures. In an aim to shrink the treatment of network resources event triggered control strategy is proposed to achieve the synchronization criteria. By constructing Lyapunov–Krasovski functional, some delay dependent criteria that assures the synchronization of CDN are derived with the help of the general integral inequalities. It should be noted that the general integral inequality used here is general than that of Jensen inequality, the Wirtinger-based inequality, the Bessel-Legendre inequality, the Wirtinger-based double integral inequality, and the auxiliary function-based integral inequalities. The resulting LMIs can be easily verified with the help of the available softwares. Finally, simulation results are proposed to verify the effectiveness of the general integral inequality and designed control law.     

An improved stability criteria for neutral-type Lur’e systems with time-varying delays

This paper improves stability criteria for neutral-type Lur’e systems with time-varying delays, where the nonlinearity satisfies sector and slope restrictions. A proposed Lyapunov–Krasovskii functional consisting of a quadratic term and integral terms for the time-varying delays and the nonlinearities, has four different characteristics. First, the quadratic term utilizes not only the current and delayed states but also the nonlinear vectors. Second, the integral terms for nonlinearities fully exploit the characteristics of sector and slope restrictions. Third, the integral terms for nonlinearities also exploit the characteristic of incremental restriction induced from the slope restriction. Fourth, this paper utilizes a vector related to the time derivative of the neutral delayed state to handle the neutral delay. Based on the proposed Lyapunov–Krasovskii functional, the improved stability criteria are derived in terms of linear matrix inequalities. Numerical examples show that the proposed criteria present less conservative results than the previous criteria.     

科技期刊媒体融合出版现状与数字版权保护及建设思考

【目的】 以神经病学与精神病学类核心期刊为例,探讨科技期刊媒体融合出版现状与数字版权保护情况,并提出相应建议。【方法】 以入选《中国学术期刊影响因子年报(2017年)》的29种神经病学与精神病学类核心期刊为研究对象,对其网络数据库、官方网站、微信公众号及手机客户端出版的现状和数字版权保护情况进行调查与分析。【结果】 29种样本期刊均被数据库收录出版。26种(89.7%)期刊建立了官方网站,但提供全文开放获取的期刊仅6种,占20.7%。15种(51.7%)期刊开通了微信公众号,其中3种(10.3%)期刊提供全文开放获取。手机App收录了27~29种期刊,其中超星数据库收录的15种期刊提供开放获取。网络数据库、官方网站、微信公众号及手机App提供的下载文件均未进行数字加密,数字版权保护意识薄弱。同时网络平台建设还存在缺乏个性化服务、互动性较差、同质化现象严重及表现形式单一的问题。【结论】 科技期刊媒体融合出版已较为普及,但在加强数字版权保护、打造具有期刊特色的网络平台、完善开放获取、集约化发展方面还有很长的路要走。     

1998～2007年档案检索研究论文的文献计量学分析

本文运用文献计量学方法,以中国期刊全文数据库和中文科技期刊数据库为平台,对其收录的1998～2007年间有关档案检索研究论文进行了定量分析。     

第四届中国古代小说国际研讨会综述

2009年8月21日至23日,由浙江师大中国文学与文化研究所和中国社科院文学研究所中国古代小说研究中心联合主办的＂第四届中国古代小说国际研讨会＂在杭州、金华两地隆重召开,来自我国大陆、港台及日本、韩国等国家地区的八十余名专家学者出席会议,并就中国古代小说的版本源流,宗教、审美与文化研究,研究动态与研究之研究,海外传播及中外比较研究等四个方面展开热烈讨论。     

走联合办刊之路促进期刊社发展--中国地震局工程力学研究所科技杂志社改革的体会

随着我国防震减灾事业的发展和科技体制改革的深入,研究所办科技期刊如何生存与发展,面临着严峻的挑战.几年来,工程力学研究所科学技术杂志社以读者为中心,制定杂志社的发展战略,联合办刊,加强编辑工作的管理,取得了初步成效.     

中国校外教育政策三十年变迁

该文以社会变迁的视角,运用话语分析的方法,探讨我国改革开放三十年间校外教育政策的变迁.这三十年间,既可以看到校外教育政策被政治话语建构的轨迹,还可以看到单一话语模式向多元话语模式转变的趋势.进入21世纪后,三个重要校外教育政策文本主题的变迁能够在一定意义上展现21世纪以来校外教育宏观发展的脉络与轨迹.