共生时变二进制樽海鞘群算法的频谱分配优化

针对认知无线网络中频谱分配优化和寻优收敛精度等难题,在图论模型的基础上提出一种共生时变二进制樽海鞘群算法,并将其运用到认知无线电频谱分配中.首先,在追随者位置更新中引入共生策略以增强开发能力;其次,在连续空间和离散空间转换过程中,引入时变函数对位置进行离散化;最后,采用改进的二进制樽海鞘群算法以最大化系统总效益和次用户公平性为目标与其它算法进行对比实验.结果表明,改进的二进制樽海鞘群算法在应用实例中优于其它算法,且能够有效、稳定用于频谱分配优化.     

九州云牵手天翼智联 让边缘计算走向“舞台中央”

和合共生,奔赴5G美好前程。久违了的世界移动通信大会(MWC)近日重返线下。在5G网络初具规模,行业应用落地开花的当下,通信行业生态链各环节齐聚上海,擘画和合共生的5G美好图景。其中,天翼智联科技有限责任公司(以下简称天翼智联)与九州云签署边缘战略合作协议,成为产业链和合共生、加快5G应用落地的重磅事件——作为中国电信智慧物流应用能力中心的天翼智联,牵手边缘计算领导者九州云,必将充分释放边缘计算赋能效应,推动传统物流向智慧物流转型升级。     

A Solvable Symbiosis-Driven Growth Model

We introduce a two-species symbiosis-driven growth model, in which two species can mutually benefit for their monomer birth and the self-death of each species simultaneously occurs. By means of the generalized rate equation, we investigate the dynamic evolution of the system under the monodisperse initial condition. It is found that the kinetic behaviour of the system depends crucially on the details of the rate kernels as well as the initial concentration distributions. The cluster size distribution of either species cannot be scaled in most cases; while in some special cases, they both consistently take the universal scaling form. Moreover, in some cases the system may undergo a gelation transition and the pre-gelation behaviour of the cluster size distributions satisfies the scaling form in the vicinity of the gelation point. On the other hand, the two species always live and die together.     

燃料电池反应器在化学品与电能共生中应用北大核心CSCD

燃料电池作为能源转换装置能够高效地将化学能转化为电能,随着技术的发展人们将其作为反应器来完成高附加值的化学品的合成,同时产生一定的电能.燃料电池反应器因具有反应条件温和、反应过程可控、产物选择性高、能源利用效率高等特点,而被广泛地应用于医药中间体的制备、气体分离、水处理等多个领域.本文首先按照反应器中阴阳极区域发生反应的类型进行分类,介绍燃料电池反应器在化学品与电能联产中的研究现状和研究进展.随后描述了燃料电池反应器中存在的问题,并依照催化剂、反应过程等方向对解决方案进行探讨.最后,对几种新型燃料电池反应器的研究进行了简要的介绍并对其发展做出了展望.     

论VR式慕课在广播电视编导专业教育中的优势特点

在“互联网+”时代,慕课对高校教育而言早已不是新鲜事物,广播电视编导专业教育也在从不同角度探索着慕课的优势和功用。VR影像作为一种全新的影像形态,具有诸多传统影像所无法比拟的优势特点,已引起广播电视编导专业教育的高度关注。本文认为,VR式的慕课能为影视专业的学生提供“沉浸式”的教学环境、“交互式”的互动过程和“猎奇式”的学习体验,这对于学生更好地将影视理论用于创作实践大有裨益。     

乙烷脱氢共生电能-增值化学品固体氧化物燃料电池研究进展

天然气/页岩气供应大幅增加推动了全球由乙烷制取乙烯等增值化学品的发展,深刻改变着石化产业的格局,乙烷高效清洁地转化为更高价值化学品具有深远意义. 乙烷蒸汽裂解制乙烯是一项比较成熟的工业生产技术,但是这一过程存在耗能高、积碳严重、热力学平衡受限等问题. 电能-增值化学品共生固体氧化物燃料电池由于可以将燃料气自发反应转化为高价值化学品的同时释放电能的特点被广泛研究. 本文总结了采用共生固体氧化物燃料电池将乙烷电化学脱氢共生乙烯增值化学品和电能的最新研究进展,重点介绍了固体氧化物燃料电池在乙烷脱氢中的工作原理和优势以及电解质和电极材料的选择等方向的研究发展,表明通过燃料电池技术低能耗实现乙烷共生乙烯增值化学品与电能具有显著的优越性,在实现高效节能的工业化生产中具有非常巨大的应用潜力.     

CeO2/RP-PSCFM@CoFe阳极材料用于质子导体乙烷燃料电池共生乙烯和电能

The continuous consumption and excessive use of fossil fuels promote the exploration of new energy conversion technologies. Meanwhile, the increase in the supply of ethane encourages the development of industrial technology for the production of ethylene chemical raw materials. Compared with traditional fossil fuel energy conversion equipment, solid oxide ethane cogeneration fuel cells are an efficient energy processing device. Through selective oxidation of fuel gas on the anode, the endothermic process of ethane dehydrogenation is converted into an exothermic oxidation reaction, which has a greater driving force for reaction thermodynamics, and simultaneously produces clean electricity and value-added chemicals without CO₂ emissions. The anode material used for the proton conductor ethane fuel cells needs to operate stably and efficiently under hydrocarbon fuel. Consequently, excellent catalytic activity, low polarization resistance, and anti-coking stability are essential. In this work, CeO₂ was uniformly impregnated into the surface of the porous cubic perovskite Pr_0.4Sr_0.6Co_0.2Fe_0.7Mo_0.1O_3−δ anode by wet impregnation, and then calcined and reduced to obtain a CeO₂/RP-PSCFM@CoFe composite anode embedded with nanoparticles, which was successfully used in electrolyte-supported proton conductor fuel cells. CeO₂ has a high ionic conductivity and transport capacity, which accelerates the transfer rate of protons on the anode and improves the catalytic reaction and transport process. Moreover, uniformly dispersed CeO₂ can effectively increase the three-phase interface of the anode reaction and increase the range of reaction activity. The peak power densities before and after wet impregnation reached 172 and 253 mW·cm⁻², respectively, at 750 ℃. When switching to ethane as the fuel, the peak power densities reached 136 and 183 mW·cm⁻², respectively. The polarization resistance of the impregnated single cell was significantly reduced, and the catalytic activity improved. Moreover, there was no attenuation for 10 h in the long-term test. Inversely, the current density increased with the continuous reduction of the composite anode. Product analysis revealed that the yield of ethylene increased from 23.52% at 650 ℃ to 34.09% at 750 ℃, and the ethylene selectivity exceeded 94%. These results clearly show that the impregnated anode exhibited excellent catalytic activity and anti-coking ability in hydrocarbon fuels at high temperatures. Combining CoFe nanoparticles with CeO₂ enhanced the electronic conductance and ionic conductance of the electrode, improved the transmission of electric energy and the efficient conversion of chemicals, thus successfully producing the cogeneration of electric energy and ethylene.     

共生频谱关联分析在无线电干扰监测中的应用

无线电信号相互组合产生干扰时,信号频谱存在共生特性,将干扰信号频率作为关注频点,在关注频段内,计算其他频点针对关注频点的条件概率,通过比较条件概率大小,寻找共生频谱,辅助进行无线电干扰排查,仿真试验结果表明该算法具有合理性和可操作性.     

2015年300mm晶圆生产还将翻番

自300mm晶圆投产迄今已逾10年,但日前市场调研公司IHS iSuppli发表的一份报告称,到2015年300mm晶圆生产还将翻番。据透露,2010年代工厂商和IDM(集成器件制造商)两者共生产300mm硅晶圆48亿平方英     

商务社交网络遭遇“猎头”竞争还是共生？

大型企业往往通过猎头和网络招聘等方式去找人，但对于那些中小企业来说，通过商务社交网络找人就是一种很有效的方式，而且这种方式的成本很低。