排序方式: 共有47条查询结果,搜索用时 359 毫秒
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Dong Liangwei Qi Wei Peng Ping Wang Linxue Zhou Hui Huang Changming 《Nonlinear dynamics》2020,102(1):303-310
Nonlinear Dynamics - We address the nonlinear dynamics of binary Bose-Einstein condensates with mutually symmetric spinor components trapped in an optical lattice. The interaction between the... 相似文献
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采用固相反应法制备了不同烧结温度(950~1 180 ℃)、烧结时间、烧结次数共7种工艺的Sr3YCo4O10.5+δ多晶块材,通过热分析、XRD、SEM确定了有序化相变和最佳烧结工艺(1 180 ℃/24 h+1 180 ℃/24 h),并研究了多晶的电磁性能。结果表明,964 ℃完全晶化的四方相Sr3YCo4O10.5在1 042 ℃吸氧(δ)完成有序化,生成Sr3YCo4O10.5+δ,而1 100 ℃和1 180 ℃烧结的样品均出现(103)、(215)超结构峰,验证了其结构的有序性。块材均呈半导体电输运行为,二次烧结晶格完整性提高,晶粒长大,300 K时电阻率仅为0.06 Ω·cm,居里温度(Tc)~335 K,零场冷曲线(ZFC)上的Hopkinson峰源于低温时被冻结的磁矩随温度升高转向磁场方向,磁化强度在298 K达到最大,随后受热扰动的影响减小。室温铁磁性源于有序结构导致的中自旋或高自旋态Co3+的eg轨道有序。 相似文献
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Zeng Liangwei Belić Milivoj R. Mihalache Dumitru Shi Jincheng Li Jiawei Li Siqi Lu Xiaowei Cai Yi Li Jingzhen 《Nonlinear dynamics》2022,108(2):1671-1680
Nonlinear Dynamics - We demonstrate the existence of various types of gap localized modes, including one- and two-dimensional (1D and 2D) single solitons and soliton clusters, as well as the... 相似文献
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1NTRODUCTIONTheacrylateterpolymer--supPOrtedsulfideplatinumcomplexanddisulfideplatinumcomplex['--2]werestudiedinthehydrosilylationofolefins.Itisfoundthattheyhavehighcatalyticactivityandreusedproperties.LiuXFetal.[3)synthesizedselena--crowneitherplatinumcomplexesandreportedtheircatalyticactivityofhydrosilylation.Clarketal.[4)reportedthatthecatalyticactivityofPiLL'Clz(L=PPh2,L'=S,N)ishigherthanthatofPtLZC12orPtL'ZC12inhydrosilylation.Inthispaper,wereportthesynthesisofanewacrylatete… 相似文献
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Equivalence Relation between Initial Values and Solutions for Evolution p-Laplacian Equation in Unbounded Space 下载免费PDF全文
In this paper,an equivalence relation between the ω-limit set of initial values and the ω-limit set of solutions is established for the Cauchy problem of evolution p-Laplacian equation in the unbounded space Yσ(RN).To overcome the difficulties caused by the nonlinearity of the equation and the unbounded solutions,we establish the propagation estimate and the growth estimate for the solutions.It will be demonstrated that the equivalence relation can be used to study the asymptotic behavior of solutions. 相似文献
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The carboranylpyrrole polymers are functional materials with superior thermal resistance and conducting performances. The carboranylpyrrole structures and Laplacian bond order (LBO) of carborane moiety, as well as the thermal resistance and conducting properties of carboranylpyrrole dimers or polymers, were investigated theoretically. The 11B NMR chemical shifts of 3-(2-methyl-o-carboranyl)alkyl-1H-pyrrole monomers (CP-1 to CP-5) were calculated and analyzed. The average LBO values of some characteristic chemical bonds in the carborane cages of CP-1 to CP-5 molecules were calculated. It is found that the average LBO values of carborane moieties change slightly with the increase in alkyl chain length. The temperature resulting in about 15–20 % weight loss for CP-1, CP-3, CP-4 and CP-5 polymers is predicted to be more than 700 °C. Apart from the C–C bonds in carborane moieties of 3-(2-R-o-carboranyl)propyl-1H-pyrrole (R = CH2OH, CH2OCH3, CN, COCl, Ph) substituents, the LBO values of other bonds in these cages change slightly relative to that in the molecule of 3-(2-methyl-o-carboranyl)propyl-1H-pyrrole (CP-3). The C–C bond LBO values in the carborane cages of these substituents with electron-donating groups (R = CH2OH, CH2OCH3) are bigger than that in CP-3, while those values in those substituents with electron-withdrawing groups (R = CN, COCl, Ph) are smaller than that in CP-3. The polymerization activity calculated for CP-1 to CP-5 monomers increases with the increase in alkyl chain length. The calculated orbital energy gap (?E LUMO?HOMO) of CP-1 to CP-5 dimers decreases with the increase in alkyl chain length, and accordingly, the electronic conductivity has the potential to increase. In addition, the calculated band gaps of CP-1 to CP-5 dimers cell models also decrease with the increase in alkyl chain length. 相似文献
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Cimetidine reacting with 1,5-dichloroanthraquinone in acetone solution can produce a charge-transfer complex that shows a strong absorption peak at 343 nm. The absorption value at 343 nm increased with cimetidine concentration in the range of 0.01—0.5 μg/mL, with regression coefficient of 0.9995 and detection limit of 0.006 μg/mL. This simple and sensitive method has been successfully applied to determine cimetidine in tablets and capsules, with average recovery of (98.47±0.92)% and (97.07±1.16)%, respectively. Furthermore, the mole ratio of the complex between cimetidine and 1,5-dichloroanthraquinone is 2∶1, and the mechanism of charge-transfer reaction is explored. 相似文献
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In this paper, we present a novel method to detect license plates in video sequences automatically. The framework mainly integrates the cascade detectors method and the Tracking Learning Detection (TLD) algorithm. The cascade detectors are used to detect license plates, and the TLD algorithm is adopted to track the license plate regions. The license plates in the first frame image are detected by the cascade detectors to build the original tracking list, the tracking results and the detection results in following frames will be compared, and the newly appearing license plate information will be added to the tracking list. Meanwhile, the tracking results existing in the current tracking list would be replaced by the corresponding detection results with higher degree of confidence. We demonstrate the effectiveness of our algorithm for license plate detection task on a road intersection dataset, and the experimental evaluation shows the detection performance has been greatly improved by synthetically using the detection and tracking strategy. 相似文献
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采用固相反应法制备铜铁矿结构的CuAl1-xMgxO2 (x=0、0.005、0.01、0.02、0.03、0.04)多晶,研究了Mg掺杂对CuAlO2多晶结构和性能的影响。Mg掺杂量x从0增加到0.02,样品均为菱方R3m单相,密度依次提高;所有样品呈半导体的热激活电输运行为,x=0.02样品在室温下的电阻率是未掺杂样品的1/19,热激活能显著下降(x=0时,ρ300 K~5.54 Ω·m,Ea~0.328 eV;x=0.02时,ρ300 K~0.29 Ω·m,Ea~0.218 eV),载流子浓度增加1个量级,主要因为Mg2+取代Al3+,引入新的受主能级。x>0.02时,MgAl2O4尖晶石杂相出现,使其电导率和热导率降低。CuAl1-xMgxO2多晶的晶格热导率在总热导率中占绝对优势,且随温度升高(300~500 K)而下降,晶格热导Callaway模型模拟表明,所有样品的热阻主要源于点缺陷-声子散射。与x=0相比,x=0.02样品的室温热导率增大1倍(κ~13.065 0 W/(m·K)),声速增大,点缺陷-声子散射减弱,分析认为掺Mg形成强的Mg—O键,提高了晶体的弹性模量和声子频率,减弱了本征点缺陷、Mg掺杂引起的质量波动和应变场波动对声子的散射,同时Mg掺杂样品的密度提高也有利于增加热导率。 相似文献