摘要：Molecular constructs define the elementary units in porous materials for efficient CO_(2)*** design of appro-priate interpore and intermolecular space is crucial to stabilize CO_(2)molecules and maximize the *** the molecular construct usually has a fixed dimension,whether its inter-molecular space could be self-adjustable during CO_(2)capture and release,behaving as a balloon,has captured *** we report a flexible intermolecular space of the double chain structure of self-assembled 1,4-pheny-lene diisocyanide(PDI)molecules on Ag(110)surface,which dynamically broadens and recovers during the CO_(2)capture and *** incipient PDI double chains organize along the[001]direction of Ag(110),in which individual PDI molecules stand up in a zigzag order with the interchain width defined by twice the Ag lattice distance along_([110])direction(2α_([110])).When CO_(2)molecules are introduced,they assemble to occupy the interchain spaces,expanding the interchain width to 3α_([110]),4α_([110])and 5α_([110]):Warming up the sample leads to the thermally-driven CO_(2)desorption that recovers the original interchain ***-resolution scanning tunneling microscopy(STM)jointly with density functional theory(DFT)calculations determine the structural and electronic interactions of CO_(2)molecules with the dynamical PDI structures,providing a molecular-level perspective for the design of a self-adjustable metal-organic construct for reversible gas capture and release.

摘要：高质量的生物多样性数据能够为生物多样性的研究与保护提供数据支撑。目前研究人员开发了大量的生物多样性数据处理软件或工具,包括工作流系统、R语言包、Python语言包和Excel工具等,但是使用这些软件或工具需要用户安装相应的软件客户端,并掌握一定的编程语言、软件开发和复杂的Excel公式等知识和技能。为降低用户的学习成本和使用门槛,本文采用了Browser/Server模式设计技术、Web技术、可视化技术、响应式开发技术、网络爬虫技术、数据处理技术和Solr智能检索技术等,针对不同维度的生物多样性数据设计和开发了相应的数据处理模块,构建了中国生物多样性在线数据处理平台(http://***/)。该平台能够有效地帮助科研人员对物种名称、地理位置、时间日期和经纬度等数据进行处理,并提供数据格式转换、数据质量评测和资源统计分析等辅助功能,帮助科研人员实现零代码和低门槛地处理生物多样性数据,提供便捷、高效和简单的数据清洗、校正、转换和整合等数据处理渠道,为生物多样性研究和保护提供信息化技术支持与服务。

摘要：为降低9305综采工作面SGZ 1000/2100型刮板输送机在运行期间断链故障影响并提高刮板输送机运行可靠性,构建了刮板输送机断链监测系统并进行现场应用。依据刮板两端位移差、机头机尾电机电流差确定是否存在断链故障;依靠定位传感器推测断链位置,详细对断链监测系统硬件及软件进行设计。工程应用后有效提升了采面刮板输送机运行效率及可靠性,设备故障排查及处理耗时降幅约15%,设备开机时长增加约10%,工程应用效果显著。

摘要：功能性电刺激(FES)是重要的卒中致残康复治疗方法,而现有的功能性电刺激设备多使用单对表面电极对肌肉施加刺激,难以在肢体运动过程中精确定位最佳刺激位置,同时,受内外干扰的影响,康复运动控制精度有待提高。为此,提出了一种基于自抗扰控制(ADRC)的多电极协同控制方法。首先,设计了一套用于上肢康复的多电极功能性电刺激系统;其次,通过分析上肢的动力学模型确定电极切换策略,在角度跟踪过程中根据角度区间动态调整电极组合,实现对最佳刺激位置的跟踪;再次,引入ADRC作为控制器实时估计和补偿系统的扰动;最后,招募健康受试者,开展仿真和实验验证。结果表明:所提出的控制方法实现了对上肢运动的精确控制,与固定电极策略的控制方法相比,平均跟踪误差均值降低了约50.41%,均方差降低了约43.30%。此外,受试者肌电信号分析结果表明:采用电极切换策略的肌电信号与固定电极策略相比,振幅平均绝对值MAV和中值频率MF分别减少了约40.21%、17.97%,肌肉疲劳得到了一定的缓解。

摘要：【目的】建立一种适用于圆红冬孢酵母代谢工程的磷酸盐饥饿诱导表达系统。【方法】对圆红冬孢酵母pho89基因5'侧翼序列进行生物信息学分析,设计相应引物,PCR扩增pho89基因启动子(p PHO89)和hsp70基因终止子(t HSP),利用RF克隆方法置换出发载体上的p PGK组成型启动子和t NOS终止子,以潮霉素磷酸转移酶基因hyg为报告基因,得到响应磷酸盐饥饿诱导的单表达盒载体p ZPK-p PHO89-hyg-t HSP,利用ATMT方法转化圆红冬孢酵母,通过转化子潮霉素抗性表型鉴定p PHO89和t HSP的启动子和终止子活性。在此基础上,构建了适合外源基因表达的双表达盒诱导表达载体p ZPK-HYG-p PHO89-MCS-t HSP,并利用该载体构建了苹果酸酶重组表达菌株。【结果】成功构建了响应磷酸盐饥饿的圆红冬孢酵母诱导性表达载体,该载体在圆红冬孢酵母中可表现出启动子和终止子活性。【结论】该启动子受磷酸盐浓度的严谨调节,响应度高,操作简单,无需额外诱导剂,经济便捷,为后续圆红冬孢酵母代谢工程研究提供了基本材料。

摘要：离子推力器具有高比冲和高效率等优势,是目前应用最广泛的电推力器之一,但亦存在着系统结构复杂、关键部件繁多等缺点.无中和器离子推力器可以消除对中和器的依赖,实现离子推进系统结构的简化,从而减小推力器体积和重量并提高系统可靠性.本文首先归纳了传统离子推力器的原理、优势及限制,引出了无中和器离子推力器的概念,对其基本原理、技术优势及分类进行了介绍;随后从等离子体源的束流自中和技术出发,总结了无中和器离子推力器的发展现状;结合空间应用需求以及无中和器离子推力器的工作特点,分析了无中和器离子推力器的关键技术,提出应将工质选择、等离子体机理研究、磁过滤装置和栅极系统设计以及栅极射频电压灵活调控方法这四方面作为其研究重点,同时应该发展并完善新的推力器参数测量方法,进一步明确无中和器离子推力器的工作特性.

摘要：[Objective] The aim of the study was to investigate extraction optimization and antioxidant activity of polyphenol in okra flower in order to enhance extraction efficiency and developing value of okra flower. [Method] Optimization of supersonic assisted extraction of phenolic compound in okra flower was investigated using uniform design methodology, and its antioxidant activity was analyzed including reducing power and the capacity of scavenging superoxide anion radicals（O-2·）. [Result]The optimal process parameters of supersonic assisted extraction were as follows：ratio of sample to solvent of 1：35, ethanol concentration of 55%, supersonic time of22 min, and in the extraction condition the experimental yield of phenolic compound was 4.28%. Moreover, phenolic compound in okra flower exhibited stronger antioxidant activities, reducing power of 0.2 mg/ml extraction fluid reached 0.672 and the rate of scavenging O-2· was 13.13%. [Conclusion] The optimization of extraction technology of phenolic compound in okra flower is simple and reliable, the result contributes to the development of phenolic compound in okra flower.

摘要：The optimal process for orange vinegar was investigated in order to explore the effect of process parameters and obtain the superior process *** process for orange vinegar was optimized using single-factor methodology and Box-behnken methodology, and the effect of process parameters was analyzed in the light of response surface plots. Results were as follows. The optimal process of alcohol fermentation was as follows： original sugar degree of 16%, yeast inoculum size of 5% and p H value of 3.5 through single-factor experiment. The optimal fermentation process of acetic acid optimized by response surface methodology was as follows： inoculum size of 8.52%, original alcohol content of 6.0% and p H value of 3.3, in the optimal condition the yield of acetic acid was 53.11 g/L. Single factor action and the interaction of two factors were presented on the yield of acetic *** effects of inoculum size and p H were extremely significant, and that of original alcohol content significant. The interaction of inoculum size and original alcohol content was non-significant, that of inoculum size and p H also non-significant. On contrast, original alcohol content and p H had significant interaction.

摘要：讲好中国故事,关系着国家形象,关系着国家文化软实力提升,关系着世界各国及国际社会如何真实客观地认识中国。影视艺术作为特殊的艺术表现形式,无论是立体的传播特性,还是直观的表现手法,都将在全面真实反映中国社会发展现状中起到重要作用。在中国特色社会主义进入新时代的历史背景下,推动影视艺术的国际传播,对讲好中国故事、传播中国声音、弘扬中国文化具有十分重要的意义。从丰富体现时代内涵的中国文化符号、展现真实客观的中国国家形象、提升中国样态表达方式、传递正确中国价值四方面分析影视艺术作品在国际传播中如何讲好中国故事。

摘要：定义动力总成悬置系统的广义力传递率及其积分和,适于作为动力总成悬置系统隔振特性优化设计计算的评价指标。提出以广义力传递率积分和极小化为目标的动力总成悬置系统优化设计计算方法,对动力总成—悬置系统的刚体振动模态频率的分布范围加以约束,可实现悬置系统布置参数和悬置元件刚度的优化。基于一种客车的动力总成—悬置系统,进行较完整的优化设计计算分析,使系统的广义力传递率、各阶固有振动频率的频率比和动态力传递率均得到了明显改善,证明了这种优化设计方法的可行性和有效性。