交织码在无线通信可靠性中的应用研究

在对无线通信可靠性要求较高的系统中，如何保证信息的无误接收是关键。本文讨论了交织码的纠错原理，给出了具体的编码设计，对可靠性的提高进行了定性和定量的分析，并在工程中得到了验证。     

用核糖体工程技术二次开发海洋微生物菌株资源的研究

经对无活性的海洋来源放线菌B3054进行链霉素抗性筛选,获得了一株具有抗肿瘤活性的链霉素抗性突变株SY-1.从该突变株的发酵物中分离得到了4个活性化合物,其中1个为新天然产物.对该菌株突变前后的rpsL基因(编码核糖体蛋白S12)进行分析未发现发生突变,提示突变位点可能在核糖体的另外亚基上.实验结果表明,核糖体工程技术可用于无活性菌株资源的二次开发利用.     

Sensing mechanism of Ag/α-MoO3 nanobelts for H2S gas sensor

Sensing mechanism is still a big problem in the field of gas sensor.In-depth study of the sensing mecha-nism can provide better ideas for the design of sensing ...     

2%CrMoNiWV高低压复合转子材料的研究

试验研究了2%CrMoNiWV高低压复合转子材料。试验件在950℃奥氏体化,高压区模拟直径1350mm,模拟喷雾冷速为2.5℃/min,回火温度为660～690℃;低压区模拟直径2500mm,模拟喷水冷速为3℃/min,回火温度为630～660℃。结果表明,综合力学性能达到了目标要求。     

喷射式凝汽器传热性能影响因素分析

空冷机组是解决富煤贫水地区电力工业发展问题的有效措施,近年来在国内外发展迅速。作为海勒式间接空冷系统的关键设备,喷射式凝汽器的性能与整个空冷机组的性能直接相关。介绍了国内外喷射式凝汽器的研究现状,分析了影响喷射式凝汽器传热性能的主要因素。     

Characterization,Expression Profiling,and Biochemical Analyses of the Cinnamoyl-CoA Reductase Gene Family for Lignin Synthesis in Alfalfa Plants

Cinnamoyl-CoA reductase (CCR) is a pivotal enzyme in plant lignin synthesis, which has a role in plant secondary cell wall development and environmental stress defense. Alfalfa is a predominant legume forage with excellent quality, but the lignin content negatively affects fodder digestibility. Currently, there is limited information on CCR characteristics, gene expression, and its role in lignin metabolism in alfalfa. In this study, we identified 30 members in the CCR gene family of Medicago sativa. In addition, gene structure, conserved motif, and evolution analysis suggested MsCCR1–7 presumably functioned as CCR, while the 23 MsCCR-likes fell into three categories. The expression patterns of MsCCRs/MsCCR-likes suggested their role in plant development, response to environmental stresses, and phytohormone treatment. These results were consistent with the cis-elements in their promoters. Histochemical staining showed that lignin accumulation gradually deepened with the development, which was consistent with gene expression results. Furthermore, recombinant MsCCR1 and MsCCR-like1 were purified and the kinetic parameters were tested under four substrates. In addition, three-dimensional structure models of MsCCR1 and MsCCR-like1 proteins showed the difference in the substrate-binding motif H212(X)2K215R263. These results will be useful for further application for legume forage quality modification and biofuels industry engineering in the future.     

大型风力发电场并网接入运行问题综述

指出风电场与常规能源电厂的主要区别,介绍了恒速恒频和变速恒频两种风力发电系统的运行原理及各自接入电力系统的现状和主要问题,阐述了风力发电场并网过程时电网产生冲出,风电场运行对电能质量、保护装置、电网频率和对电力系统运行成本等几方面产生的影响.     

FNN与混合遗传算法在智能优化的策略比较

FNN是一种重要的神经网络结构,混合遗传算法是一种正在兴起的启发式随机搜索技术,两者在智能优化中得到了广泛的应用。两者的优化机理不同,方法不同,各有千秋。论文从提高两者的优化性能出发,研究其智能优化的实现策略,并对两者进行了比较,得出了有意义的结论。     

双足足球机器人守门策略研究

首先提出了双足足球机器人的体系结构,然后给出了基本步态算法,针对FIRA类人型项目比赛规则,提出了全新的双足足球机器人守门策略,最后给出了分析测距试验数据,验证了测距准确性和守门策略的合理性.