排序方式: 共有30条查询结果,搜索用时 15 毫秒
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Yang Liu Mengyi Zhang Liqiu Wang Yajuan Hou Chenxiao Guo Haiying Xin Shuang Xu 《中国化学快报》2020,31(3):805-808
A promising biomass carbon material,manufactured by the carbonation of Physalis peruviana L.calyx at 700℃,is presented in this wo rk.Morphology characterization shows that the carbon material possesses long microtubule bundling and above 30%natural O-atom component on the surface.After KOH chemical etching,the materials maintain the oxygen content but exhibit more micropores and higher specific surface area up to 1732.6 m^2/g.Using as an electrode material for supercapacitor,the active carbon material exhibits high specific capacitance up to 339.7 F/g at 0.5 A/g in 3 mol/L KOH aqueous solution through three-electrode system.The active carbon material also exhibits excellent cycling stability(97%retention)by 10,000 cycles at 10 A/g.The outstanding electrochemical performances are attributing to the unique long microtubule bundling with much more pores and the abundant Oelement on the surface.This biomass carbon material with excellent electrochemical properties could be a useful material for multiple applications. 相似文献
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HSUPA作为继HSDPA后又一个增强的数据解决方案,在全球多媒体发展、视频监控以及移动VoIP升温的脚步声中,走入运营商的视野,受到业界的广泛关注。文章介绍了HSUPA的关键技术,详细分析了HSUPA的引入对网络带来的影响,对网络规划带来的影响。最后给出HSUPA的应用部署前景。 相似文献
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本文在考虑油藏内流体影响的基础上, 进一步讨论了裂缝诱导各向异性的极化角和方位角的影响, 对裂缝诱导TTI (tilted transverse isotropy)双孔隙介质模型进行了研究. 在裂缝诱导HTI (horizontal transverse isotropy)双孔隙介质理论的基础上, 用Bond变换推导了裂缝诱导TTI双孔隙介质的柔度系数矩阵和耗散系数矩阵, 从而建立了介质的一阶速度应力方程. 采用交错网格高阶有限差分法及PML边界条件, 对xoz平面内的2.5维矢量波动方程进行了数值模拟. 结果表明,裂缝的极化角和方位角的存在都会导致横波分裂, 而在双层裂缝诱导TTI双孔隙介质模型的分界面上,又会产生转换波的分裂和横波的再分裂现象, 这就增加了波场的复杂性, 从而为进一步研究实际地球介质的地震波场传播特征奠定了基础.
关键词:
裂缝诱导TTI
双孔隙
裂缝极化角
裂缝方位角 相似文献
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Jens S. Frederiksen Kim S. Larsen John Noga Patchrawat Uthaisombut 《Journal of Algorithms in Cognition, Informatics and Logic》2003,48(2):407
When messages, which are to be sent point-to-point in a network, become available at irregular intervals, a decision must be made each time a new message becomes available as to whether it should be sent immediately or if it is better to wait for more messages and send them all together. Because of physical properties of the networks, a certain minimum amount of time must elapse in between the transmission of two packets. Thus, whereas waiting delays the transmission of the current data, sending immediately may delay the transmission of the next data to become available even more. We propose a new quality measure and derive optimal deterministic and randomized algorithms for this on-line problem. 相似文献
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Sammo Cho Geon Kim Youngho Jeong Chunghyun Ahn Soo In Lee Hyuckjae Lee 《ETRI Journal》2006,28(3):364-366
This letter introduces an efficient transmission of traffic information through a terrestrial digital multimedia broadcasting system, which is a multimedia and mobility empowered option of the European digital audio broadcasting system. By adapting Korean characteristic traffic information into the transport protocol expert group messages in the traffic information delivery, a highly efficient traffic information system was implemented and tested in Korea. 相似文献
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以一个制造商向一个零售商同时销售两种互补产品的二级供应链为研究对象,研究了制造商、零售商分别采用不同捆绑策略下的供应链定价博弈问题,并对四种定价模型(分开—分开,分开—捆绑,捆绑—分开,捆绑—捆绑)进行比较分析,探讨了产品互补程度、边际利润水平与供应链利润、最优捆绑策略的关系。研究结果表明,对领导者制造商而言,采取分开定价是占优决策;对于追随者零售商而言,是否采取捆绑定价取决于产品互补程度与产品边际利润水平比值,当产品互补程度变大或者边际利润比值降低时,零售商的最优策略由捆绑策略向分开定价策略转变。 相似文献
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基于数字音频广播(DAB)技术,文章提出了一种交通诱导信息广播系统和一种车载智能终端。交通诱导信息广播系统将高速发展的广播数字化技术与城市交通智能管理相结合,是集信息采编、信息发布、信息移动接收、交通实时导航、娱乐于一体的信息处理平台;车载智能终端基于DAB技术,是用于对车辆现代化管理的设备。交通诱导信息广播系统依托移动网络可以从服务车辆上获得全球定位系统(GPS)定位信息,从而监控和跟踪车辆;车载智能终端可以接收DAB信道的实时广播、动态路况、车辆的导航路径等信息。 相似文献
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Popeney CS Setaro A Mutihac RC Bluemmel P Trappmann B Vonneman J Reich S Haag R 《Chemphyschem》2012,13(1):203-211
A series of nonionic amphiphiles derived from polyglycerol dendrons were studied for their ability to solubilize and isolate single-walled carbon nanotubes. The amphiphiles possessed differently sized polar head groups, hydrophobic tail units, and various aromatic and non-aromatic groups between the head and tail groups. Absorbance analysis revealed that amphiphiles with anchor groups derived from pyrene were far inferior to those that possessed simple linear aliphatic tail groups. Absorbance and near-infrared fluorescence analyses revealed a weak dependence on the dendron size of the head group, but a strong positive trend in suspended nanotube density and fluorescence intensity for amphiphiles with longer tail units. Variations in the moieties linking the head and tail groups led to a range of effects on the suspensions, with linkers imparting flexibility and a bent shape that gave improved performance overall. This was illustrated most dramatically by a pair of benzamide-containing amphiphiles, the para isomer of which showed evidence in the fluorescence data of increased nanotube aggregate formation when compared with the meta isomer. In addition, statistical AFM was used to illustrate more directly the microscopic differences between amphiphiles that were effective at nanotube bundle disruption and those that were not. 相似文献