小毛足鼠(Phodopus roborovskii)食性和食量的研究

小毛足鼠饲喂试验结果以及颊囊食物统计结果表明,该鼠在饲喂条件下食物资源利用谱相对较宽,但在野外条件下食物资源的利用主要以植物种子为主;并结合具体情况探讨了造成野外条件下该鼠食物资源利用范围趋于特化的原因．估算了小毛足鼠的采食效率为０．０７６％～０．１４％．在以上研究基础上,对小毛足鼠的危害与防治问题作了初步分析与说明     

α─萘乙酸甲酯的合成研究

本文报导了用固体超强酸Ｔｉｏ２／ＳＯ２－４催化合成。α－萘乙酸甲酯的方法，并讨论了催化剂的用量、反应物的摩尔比、反应温度等对反应产率的影响。     

Slack-nibbling battery-aware task scheduling

Dynamic voltage scaling (DVS) is an efficient approach to maximize the battery life of portable devices. A novel overall planning strategy (OPS II) balancing slack supply and demand for DVS is proposed. An OPS II-based slack-nibbling overall planning strategy (SNOPS) algorithm is also proposed, which iteratively nibbles slacks for appropriate tasks selected by an overall planning dynamic priority function to perform DVS until the slack is exhausted and an optimum voltage setting is obtained. For a high-load task set, SNOPS manages to recover battery overload while maintaining schedulability. For random variable-load task sets, SNOPS achieves a saving of 29.51% battery capacity on average, the suboptimal gap is 27.84% narrower than that of our previously proposed OPS-based algorithm, and 92.10% narrower than that of the algorithm proposed by Chowdhury et al. Results indicate that OPS II manages to save battery to various extents while maintaining schedulability, and demonstrates good load compatibility and close-to-optimal performance on average. Biography: GAO Xun(1981–), male, Ph.D. candidate, research direction: embedded system, power optimization.     

结核分枝杆菌的抗逆性与致病性研究进展

结核病是由结核分枝杆菌(Mycobacterium tuberculosis,MTB)复合群感染导致的人畜共患传染病,在新型冠状病毒感染暴发前是全球死亡人数最多的单一传染病。结核病致死率高,主要原因是其致病菌结核分枝杆菌具有极强的毒力且可以抵御多种外界环境胁迫因子。本文主要介绍结核分枝杆菌对理化胁迫的耐受性,以及结核分枝杆菌的耐药性、致病性与免疫性,为深入研究结核病的发病机制和研发新型的抗结核药物提供理论指导。     

环境影响评价工作中存在的几点问题及建议

通过对环境影响评价工作所遇到各种问题的总结、分析,提出改善环境影响评价制度的对策措施。     

网络游戏在疫情防控中的作用及意义：基于疫情期间在线交互数据的实证分析

 基于平行系统理论和多空间智能分析方法，围绕网络虚拟空间、现实物理空间、社会心理空间三者间的作用关系，提出疫情防控大数据分析框架，并使用真实在线交互数据，从预测疫情发展、反馈复产复工情况、影响群体疫情认知3个方面进行了实证分析。研究发现，网络游戏交互数据可以在一定程度上预测疫情的暴发和演进情况，能够较为准确地还原社会复产复工情况，可以有效改善社会群体对于疫情的认知。以网络游戏为代表的网络交互数据能够有效填补疫情防控工作中存在的“触达盲区”和传统大数据资源的应用局限，帮助政府和社会丰富疫情防控应对机制，对于构建更加完备的社会治理体系具有积极的作用。     

从术语学基本模型的演变看术语学的发展趋势

通过对术语学领域中不同时期的基本模型进行分析,发现包含术语、概念、客体三个元素的三角模型是最为典型的术语学理论模型,在此基础之上,不同学者根据不同研究依据、研究倾向和研究目标构建了不同形式的术语学理论模型。他们或是基于哲学、语言学、神经科学基础构建模型,或是以术语管理、术语翻译、术语工作人工智能化应用等为目标构建模型。对众多不同形式的术语模型分析最终还需要回归到几个重要概念以及这些概念之间存在的关系分析上。另一方面,也希望通过对这些模型的分析展示术语学发展的脉络和发展趋势。     

Spatial channel characteristics in the outdoor hotspot environment based on wideband MIMO measurements

Wideband multiple-input multiple-output （MIMO） channel measurements were performed at 5.25GHz in the hotspot environment in Beijing. The propagation mechanism was line-of-sight and obstructed-line-of-sight （LOS/OLOS） in the outdoor scenario. Using a large amount of estimated angle of departure （AoD） and angle of arrival （AoA） results, the cumulative distribution functions （CDFs） of directional spread （DS） are extracted, which illustrate that the spatial dispersion is quite significant at both ends due to the low antenna height of base station and rich scatterers. The average power azimuth spectrum （PAS） is found to be well fitted with a Laplacian function. In addition, the non-isotropic property of spatial correlation is investigated, and the average envelop correlation over arbitrary antenna spacing provides the correlation distance to facilitate the MIMO optimization and deployment in the outdoor hotspot environment.     

Carbon-Carbon Bond Formation Reactions in the Preparation of Hydrindanones

1 Introduction Carbon-carbon bond formation reactions are highly important in organic chemistry, because these reactions may be used to construct complicated molecules. Samarium diiodide is known to be a one-electron reducing agent and recently used in many organic reactions. A radicals is postulated as an intermediate, which may be formed by direct reduction of halides, carbonyls and other functional groups.1IntroductionCarbon-carbon bond formation reactions are highly i mportant in organic …     

土工试验中含水量的测定方法

介绍了土工试验中含水量测定的3种方法:烘干法、酒精燃烧法和微波法。通过比较这3种方法的试验数据,认为用微波法在测定含水量的方法中较其他两种方法更经济和实用,准确度也较高。