用C语言链表解决大整数运算的精度问题

介绍用C语言链表解决大整数运算的精度问题的方法。     

高频电子线路教学浅析

高频电子线路是电子通信专业学生的一门重要的专业基础课,其实践性和理论性都很强。本文结合高频电子线路的教学实践,分析了高频电子线路课程在教学时的特点及困难之处,并从教学内容、方法及手段等方面提出了相应的建议。     

柔性防护结构在长港河道整治工程中的应用

通过鄂州长港河道整治工程的实际工程应用,提出了可普遍应用于河道流域治理的柔性防护结构解决方案,通过与传统刚性防护结构进行比选,归纳总结柔性防护结构在安全、经济、施工、生态方面的突出特点,为类似工程提供了一种可借鉴的解决办法。     

Design of 60GHz RF Transceiver in CMOS:Challenges and Recent Advances

With more than 40 years Moore scaling, the speed of CMOS transistors is around 100 GHz. Such fact makes it possible to realize mm-wave circuits in CMOS. However, with the target of achieving broadband and power-efficient operation, 60 GHz CMOS RF transceiver faces severe challenges. After reviewing the technology issues, regarding the 60 GHz applications, this paper discusses design challenges both from the system and the building block levels, and also presents some simulated or measured circuits results.     

用表面活性剂助滤大冶铜精矿的试验研究

为降低大冶铁矿铜精矿的滤饼水分，进行了表面活性剂的助滤试验。试验研究了表面活性剂种类和用量、矿浆pH值、过滤压差及药剂添加方式等条件对铜精矿过滤过程的影响，结果表明，当矿浆pH=10，用量为125和140g／t时，助滤剂TS-2和TS-1既能提高过滤速度，又能降低滤饼水分约3个百分点。若采用分段—喷洒加药方法，效果更佳。     

Short communication: Global transcriptome analysis of Lactococcus lactis ssp. lactis in response to gradient freezing

Lactic acid bacteria are often preserved as starter cultures by freezing to extend shelf stability as well as maintain cell viability and acidification activity. Previous studies showed that the endocyte extracted from gradient-freezing pretreated cells could act as lyoprotectant in the lyophilization process of Lactococcus lactis ssp. lactis. In this study, the molecular mechanisms of L. lactis in response to gradient freezing exposure are described using high-throughput sequencing. Nineteen of 56 genes were upregulated after gradient freezing, whereas 37 genes were downregulated. Further validation results of quantitative real-time PCR experiments were consistent with the RNA sequencing. Gene Ontology (http://www.geneontology.org/) enrichment and Kyoto Encyclopedia of Genes and Genomes (KEGG; https://www.genome.jp/kegg/) pathway were used to analyze the differentially expressed genes. Several pathways, such as glutathione metabolism, ATP-binding cassette transport, metabolism of cell wall and cell membrane components, and stress response-related pathways, were affected by gradient freezing. Six genes relevant to freezing stress response were selected for quantitative real-time PCR, including 3 upregulated genes (hisK, eutD, dukA) and 3 downregulated genes (als, yedF, pepN). The Gene Ontology enrichment and KEGG pathway analyses showed these genes may influence stress response-related pathways, improving the survival of the L. lactis under freezing stress. The identification of these genes deepened an understanding about their response under freezing stress, helping us find potential genes or pathways related to gradient freezing for further research on lyoprotectants.     

聚苯胺的合成、表征及气敏性能研究

用化学氧化聚合法,以苯胺(An)为单体,过硫酸铵(APS)为氧化剂,控制反应温度,在酸性介质(无机酸和有机酸)中合成聚苯胺(PAn)。用傅里叶红外光谱(FTIR)和紫外可见光光谱(UV-Vis)对聚苯胺掺杂前后结构的变化进行了测试,讨论了酸掺杂对聚合产物结构的影响。结果表明电子的离域使聚苯胺主链结构经质子酸掺杂后形成了共轭结构。常温下,通过聚苯胺的气敏性能测试,得知有机酸掺杂的聚苯胺的气敏性能更好,其中用磺基水杨酸掺杂的聚苯胺对1000ppm氨气的灵敏度最高,达到了14.8580,具有实际应用价值。     

工业用户燃气远程自动抄表系统的应用

自动抄表系统是利用无线数据传输技术实现对用户用气状况的远程管理。从工业用户实际应用出发,阐述了燃气远程自动抄表系统的工作原理、组成、功能、应用注意事项,提出了拓展应用的建议。     

三开间单跨柔性棚洞在落石冲击作用下的试验研究

为克服钢筋混凝土结构式棚洞施工难度大,费用高等不足,满足快速抢修抢建要求,提出一种由型钢拱架和金属网组成的柔性棚洞。由于三开间单跨柔性棚洞的传载耗能特点与单开间单跨柔性棚洞存在区别,为此在现有单开间单跨柔性棚洞研究的基础上,提出三开间单跨柔性棚洞的设计方案,制作1∶1试验模型,并进行了25kJ、50kJ、100kJ和250kJ的落石冲击试验。宏观试验现象表明：①当落石能量在100kJ范围内时,柔性棚洞能够成功的对其进行拦截,而不需要对结构进行维护;②当落石能量在250kJ时,柔性棚洞在成功对其进行拦截的情况下,仅需要经过简单的维护即可继续投入使用;③柔性棚洞内的净空满足安全要求。此外,采用应变片、荷载传感器和高速摄像机等对落石冲击过程和柔性棚洞中钢拱架的动力反应进行了测试,综合试验测试数据,对柔性棚洞的变形特点、传载耗能机理和破坏特点进行了分析,指出了柔性棚洞中易发生破坏的薄弱部位,提出了下一步柔性棚洞的改进措施。