排序方式: 共有109条查询结果,搜索用时 15 毫秒
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以聚苯乙烯(PS)为模板,采用模板法成功制备了新型核壳基H3PW12O40@TiO2复合太阳能电极材料.采用SEM、TEM以及XRD对制得的太阳能电极材料进行形貌、结构的表征,并测量了4种DSSC的开路电压和短路电流.结果表明:H3PW12O40@TiO2复合粒子的粒径为500 nm,复合粒子中的TiO2为锐钛矿结构,H3PW12O40仍保持Keggin结构.并且测得了稳定的开路电压和短路电流,表明H3PW12O40@TiO2复合薄膜电极材料对电解质、染料以及对电极具有良好的适应性,为进一步开发DSSC打下一个良好的基础. 相似文献
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报告504例健康成人同步12导心电图QT离散度(QTdispersion,QTd)的分析结果。①各参数的测量结果(x±s):QTd、矫正的QTd(QTcd)、QRS离散度(QRSd)、QT顶点的离散度(QTpd)、QRS起始早晚的离散度(OQTd)分别为:男性:48±13、51±14、30±11、43±16、18±6(ms);女性:42±12、47±14、28±10、39±17、16±6(ms)。②性别差异:男性各参数离散度(QTd、QTcd、QRSd、QTPd、OQTd)及RR、QRS问期均大于女性,而QT、QTc、QTp间期却小于女性。③QT、QTd测量的可重复性受测量方法尤其是T波终点的确定方法影响。 相似文献
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对于12号无砟道岔及配套交叉渡线而言,需要研究列车与道岔间的动态相互作用问题。分别建立了车辆模型和道岔模型,其中车辆模型采用主要考虑车体、转向架和轮对三部分结构的单列全车模型,道岔模型包括转辙器、连接部分、12号辙叉、6号锐角辙叉及6号钝角辙叉等基本结构,充分考虑各细部结构对其振动的影响,以尽可能与实际情况相符;然后用列车动力学和道岔动力学理论,建立可考虑交叉渡线道岔钢轨型面变化的列车-道岔耦合动力学计算模型。研究结果表明:当CRH2动车组以时速50 km侧向通过客运专线用60 kg/m钢轨12号交叉渡线道岔时,能满足旅客的安全性和舒适性要求。 相似文献
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Yeon-Gyu Kim Sun-Young Kim Hyoung-Tae Kim Seok-Won Lee Byeong-Seok Yu 《Journal of Marine Science and Technology》2007,12(3):130-138
The maneuvering characteristics of a large container ship with twin propellers and twin rudders were investigated using the
horizontal planar motion mechanism (HPMM) test and computer simulation. A mathematical model for maneuvering motion with four
degrees of freedom (DOF) for twin-propeller and twin-rudder systems was developed and included the effects of roll motion.
To obtain the roll-coupling hydrodynamic coefficients of a container ship, a four-DOF HPMM system having a roll motion mechanism
and a roll moment measurement system was used. At the full load condition, HPMM tests were carried out for two different 12 000-TEU
container ship models, one with twin propellers and the other with a single propeller. Using the hydrodynamic coefficients
obtained from the tests, computer simulations were carried out. Simulation results for the container ship with twin propellers
and twin rudders were compared with the results for the container ship with a single propeller and single rudder. 相似文献
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ADENO-ASSOCIATED VIRUS INTRODUCED INTEGRATION AND EXPRESSION OF FOREIGN GENES IN PC12 CELLS 总被引:1,自引:0,他引:1
The ability to induce the expression of targetgenes in neurons is a goal of molecular neurobiolo-gy up to now. A variety of means including lipo-somes and recombinant retrovirus vectors and re-combinant adenovirus vectors have been used to ac-coplish this goal. Each method has some specificdisadvantages['J. None can provide reliable andcontinuouk gene expression in neurons of the cen-tral nervous system.Vectors derived from adeno--associaed virus(AAV ) have the potential to stably transducem… 相似文献
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重点介绍铁路客运专线TLJ-900型架桥机及12 m宽预制箱梁过双线已衬砌隧道的技术方案和架桥机改装的施工方案,并对架桥机和12 m宽预制箱梁过隧道施工要点进行了阐述. 相似文献
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根据MCU的特点、原理及电磁兼容性设计方法,研制了一款并联式混合动力公交车的整车控制器(HCU),并利用硬件在环仿真测试对硬件系统功能进行了验证。结果表明,该HCU性能稳定、工作可靠、能准确实现整车控制功能。 相似文献