采用ABMS方法的煤炭企业服务化绩效的影响机制研究

本研究认为煤炭企业服务化转型是促进产业结构调整与升级的有效措施.为了分析服务化对企业绩效的影响机制,将服务化分为服务创新与组织创新两个维度,并采用基于Agent的建模仿真(Agent-Based Modeling And Simulation,ABMS)方法和CobbDouglas生产函数构建企业服务化创新多Agent仿真模型,通过确定管理者、员工、科研机构和政府等Agent及其属性,借助Netlogo仿真平台模拟组织变革水平、知识获取水平和政策支持对服务化绩效的影响程度.结果表明:组织变革水平与服务化绩效之间呈S型曲线关系;知识获取水平与服务化绩效之间呈倒U型曲线关系;政策支持与服务化绩效具有显著的正向影响.多Agent仿真模型促进了服务化对绩效影响的定量化分析研究,为煤炭企业决策提供了有效依据.     

先进高强钢DP590焊缝的组织特征和力学性能改善

The effects of the welding current mode in resistance spot welding on the microstructure and mechanical properties of advanced high-strength steel dual-phase 590 (DP590) sheets were investigated. Results showed that a rough martensitic structure was formed in the weld zone of the sample welded via the single-pulsed mode, whereas the microstructure in the heat-affected zone consisted of a very rough martensitic microstructure and rough ferrite. However, using the secondary pulse mode led to the formation of tempered martensite in the weld zone. The maximum load and the energy absorption to failure of the samples with the secondary pulsed cycle were higher than those of the samples with the single-pulsed mode. Tensile shear results indicated that the secondary pulsed mode could significantly change the mode of failure upon shear tension testing. Therefore, the obtained results suggest that the use of secondary pulsed mode can improve the microstructural feature and mechanical properties of advanced high-strength steel DP590 welds.     

一种新的高效Turbo码交织器设计

采用随机分块的方法 ,研究Turbocode交织器的并行编码结构 ,以获得高编码增益。探讨对随机分块方法进行改进 ,当交织器的总长度为N ,将它分为M个子数据块 ,按标准随机交织器的生成方式 ,生成 1个子模块内的交织π ,交织的总次数为N/M次 ,将在各个子数据中同一位置的数据位 ,交织到对应的子数据块之后 ,也让它们具有相同的位置。这样可以在满足同样的S参数条件下 ,将用于查找表所需的存储器的容量减小到原来的 1/M ,并达到相同的误差率要求     

CPA矩阵计算－分光光度法同时测定动植物细胞赋活剂中有机组分

研究和建立了ＣＰＡ矩阵－分光光度法同时测定动植物细胞赋活剂（丰产素）中的四种有机组分的新方法，确定了实验条件，选择４５０，４１０，４００，３８０，３６０，３４０，３２０及３００ｎｍ８个波长为矩阵波长列，方法简便、快速、准确，样品测定中对各组分的相对偏差在０．４８％～３．８０％范围；回收率在９９％～１０５％范围。     

X波段介质填充的盘荷波导模型腔的理论与部分实验研究

用场匹配方法计算了X波段（f=9．37GHz）介质填充的盘荷波导加速结构的基模（TM01模）和高次模（HEM11模）的色散曲线，结果与Mafia程序的计算结果相一致，并且直观地反映了工作模式和谐振频率之间的关系；结果还表明HEM11模的截止频率和传播常数都比TM01模的低．依据Mafia仿真和实验结果，微调模型腔的内半径，反复加工模型腔进行实验研究，并对测试条件进行了分析，得到了比较好的结果．     

广西中药资源开发利用对策

在阐述广西中药资源优势的基础上,根据广西中药资源的开发利用现状及其存在的主要问题,提出广西中药资源开发利用的建议与对策,为广西中药资源可持续利用提供参考。     

Protein flexibility acclimatizes photosynthetic energy conversion to the ambient temperature

Adjustment of catalytic activity in response to diverse ambient temperatures is fundamental to life on Earth. A crucial example of this is photosynthesis, where solar energy is converted into electrochemical potential that drives oxygen and biomass generation at temperatures ranging from those of frigid Antarctica to those of scalding hot springs. The energy conversion proceeds by concerted mobilization of electrons and protons on photoexcitation of reaction centre protein complexes. Following physicochemical paradigms, the rates of imperative steps in this process were predicted to increase exponentially with rising temperatures, resulting in different yields of solar energy conversion at the distinct growth temperatures of photosynthetic mesophiles and extremophiles. In contrast, here we show a meticulous adjustment of energy conversion rate, resulting in similar yields from mesophiles and thermophiles. The key molecular players in the temperature adjustment process consist of a cluster of hitherto unrecognized protein cavities and an adjacent packing motif that jointly impart local flexibility crucial to the reaction centre proteins. Mutations within the packing motif of mesophiles that increase the bulkiness of the amino-acid side chains, and thus reduce the size of the cavities, promote thermophilic behaviour. This novel biomechanical mechanism accounts for the slowing of the catalytic reaction above physiological temperatures in contradiction to the classical Arrhenius paradigm. The mechanism provides new guidelines for manipulating the acclimatization of enzymes to the ambient temperatures of diverse habitats. More generally, it reveals novel protein elements that are of potential significance for modulating structure-activity relationships in membrane and globular proteins alike.     

基于EMD算法的空间自旋目标平动补偿与微动特征提取

针对微多普勒频率附加在空间目标高速轨道运动产生的多普勒频移上使微动特征提取更加困难这一问题,提出了一种利用EMD算法对空间目标进行精确平动补偿和微多普勒特征提取的方法。对空间自旋目标进行建模,推导了窄带雷达条件下空间目标的微多普勒效应,并分析了平动分量对微多普勒的影响;把目标回波分解成一系列本征模态函数(IMF),然后求出瞬时频率,利用经验模型分解(EMD)算法对瞬时频率进行分解,分析各分量的能量百分比判别平动频移分量,实现回波信号的平动补偿;对平动补偿后的信号利用 EMD算法分离出微多普勒曲线,提取微动特征。仿真实验验证了该方法的可行性与有效性。     

环的强正则性

在主左(右)理想是弱右(左)理想的条件下, 研究一些特殊环(如GP-V-环、 GP-V′-环、 弱正则环和广义正则环等)的强正则性, 得到了强正则环的一些等价刻画.     

紫苏粕中黄酮类化合物的提取研究

用乙醇浸提法从紫苏粕中提取黄酮类化合物,通过单因素及正交试验,分别考察了浸提时间、浸提温度、乙醇体积分数及料液比对提取率的影响.结果表明:对照样品的线性回归方程为A=0.004 9+0.01 c,相关系数R=0.999 8;浸提时间2h、温度70℃、乙醇体积分数50%、固液比1:12g·mL~(-1)时黄酮类化合物的得率最高为51.34 mg·g~(-1),加标回收率在94.40%-107.18%之间.原紫苏叶中的黄酮类化合物的平均得率为70.09mg·g~(-1),说明紫苏叶经超临界CO_2提取挥发油后黄酮类物质的损失较少,该工作可以促进紫苏粕资源的综合利用.