排序方式: 共有89条查询结果,搜索用时 15 毫秒
71.
Wenhui Yuana Huarong Chena Ranran Changa Li Lib a School of Chemistry Chemical Engineering South China University of Technology Guangzhou China b College of Environmental Science Engineering China 《中国颗粒学报》2011,(3)
NaA zeolite with average particle size of 1 m was successfully synthesized by microwave heating. Inu-ences of pre-crystallization time,microwave power and microwave heating time on the synthesis of NaA zeolite were investigated. The as-synthesized sample was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and particle size distribution(PSD) . Thermal and fiame retardant properties as intumescent fiame retardant(IFR) in chloroprene rubber(CR) system,such as thermo-gravimetry(TG),lim... 相似文献
72.
针对瞬态信号方位估计问题,提出了基于连续小波变换的多重信号分类测向算法(CWT_MUSIC)。首先由信号特征确定小波尺度参数,构造Morlet小波,对信号进行小波变换,利用获得的小波变换系数建立多分辨时频阵列信号模型,并据此模型设计基于子空间的MUSIC算法以实现瞬态信号的波达方向估计;然后对该算法的多分辨与误差性能进行分析,最后仿真实验和实际爆炸试验验证了所提出的CWT_MUSIC算法能有效地提高空间谱的分辨率和DOA估计性能。 相似文献
73.
Zetian Tao Lei Bi Litao Yan Wenping Sun Zhiwen Zhu Ranran Peng Wei Liu 《Electrochemistry communications》2009,11(3):688-690
A novel single phase BaCe0.5Bi0.5O3 ? δ (BCB) was employed as a cathode material for a proton-conducting solid oxide fuel cell (SOFC). The single cell, consisting of a BaZr0.1Ce0.7Y0.2O3 ? δ (BZCY7)-NiO anode substrate, a BZCY7 anode functional layer, a BZCY7 electrolyte membrane and a BCB cathode layer, was assembled and tested from 600 to 700 °C with humidified hydrogen (~3% H2O) as the fuel and the static air as the oxidant. An open-circuit potential of 0.96 V and a maximum power density of 321 mW cm?2 were obtained for the single cell. A relatively low interfacial polarization resistance of 0.28Ω cm2 at 700 °C indicated that the BCB was a promising cathode material for proton-conducting SOFCs. 相似文献
74.
Hua Wei W. L. Yang Fei Zhou Ranran Fang Xiao-Long Zhang 《International Journal of Theoretical Physics》2009,48(6):1781-1789
We propose a scheme for a large-scale cluster state preparation of single-charged semiconductor quantum dots utilizing Faraday
rotation. Without interaction between quantum dots, the exciton induced Faraday rotation could distribute the spatially separate
quantum dots into a quantum network assisted by cavity QED. We obtain the corresponding parameters from the numerical simulation
based on the input-output process for the required Faraday rotation and some discussion is made in view of experimental feasibility. 相似文献
75.
设计合成了三类含1,2,3-三氮唑结构的1,5-苯并硫氮杂[艹卓]化合物3-(1H-1,2,3-三氮唑)-4-芳基-2,5-二氢-1,5-苯并硫氮杂[艹卓](5a^5f)、3-(2H-1,2,3-三氮唑)-4-芳基-2,3-二氢-1,5-苯并硫氮杂[艹卓](6a^6f)和3-(1H-1,2,3-三氮唑)-4-芳基-2,3,4,5-四氢-1,5-苯并硫氮杂[艹卓](7a^7f).研究了中间体及目标产物的合成条件,分离出其中两个副产物并进行了结构确定.目标产物的抑真菌活性测试表明,化合物5a^5f对真菌具有良好的抑制作用,对新生隐球菌的抑制效果尤为突出.初步抑真菌构效关系研究表明, 1H-1,2,3-三氮唑环和C=C双键是化合物5a^5f抑真菌活性的关键官能团. 相似文献
76.
77.
In this paper, we synthesized three kinds of ferrites and investigated their photothermal property. The result indicated that the photothermal effect of Fe3O4 and MnFe2O4 nanoparticles declined while that of ZnFe2O4 nanoparticles maintained relatively stable after preservation for 70 days, and then ZnFe2O4 nanoparticles could effectively kill cancer cells under NIR laser. 相似文献
78.
研究了在轨服务欠驱动空间柔性机器人的广义递推高效动力学算法. 根据系统中铰的驱动情况分别对铰链定义为主动铰和被动铰,通过判断铰链的类型分别按照两次从系统的顶端到基座的顺序、一次从基座到顶端的顺序进行了系统铰接体惯量的递推、系统冗余力的递推和广义加速度和广义主动力的递推. 通过上述3 种方式的递推过程建立了空间机器人广义递推动力学模型,实现了高效率O(n) 次的计算效率. 然后采用线性多步积分算法,对所建立的微分-代数方程进行了快速的数值求解. 最后通过软件编制仿真验证了本研究内容的正确性和高效性. 相似文献
79.
作者研究了关于有穷级整函数两个差分算子的分担值问题,证明了:令f(z)是满足λ(f-a(z))<p(f)的有穷级超越整函数,其中a(z)(∈ S(f))是整函数且满足p(a(z))<1,并令η(∈C)是常数且满足Δ2ηf(z)≠0.如果Δ2ηf(z)和Δηf(z)CM分担Δηa(z),其中Δηa(z)∈S(Δ2ηf(z... 相似文献
80.
Jia X Yan C Chen Z Wang R Zhang Q Guo L Wei F Lu Y 《Chemical communications (Cambridge, England)》2011,47(34):9669-9671
Flexible, binder-free LiMn(2)O(4)/CNT nanocomposites with good reversible capability and cycling stability were fabricated by in-situ hydrothermal growth for flexible lithium battery applications. 相似文献