检索结果-南通市图书馆

Exact Solutions to the Two-Dimensional Spatially Inhomogeneous Cubic-Quintic Nonlinear Schr(o)dinger Equation with an External Potential

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第7期29卷 10-13页

作者： chen jun-chao ZHANG Xiao-Fei LI Biao chen Yong Nonlinear Science Center Ningbo UniversityNingbo 315211 National Time Service Center Chinese Academy of SciencesXi’an 710600 Institute of Physics Chinese Academy of SciencesBeijing 100190 Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062

We investigate the two-dimensional spatially inhomogeneous cubic-quintic nonlinear Schr(o)digner equation with different external *** the absence of external potential or in the presence of harmonic potential,the number of localized nonlinear waves is associated not only with the boundary condition but also with the singularity of inhomogeneous cubic-quintic nonlinearities;while in the presence of periodic external potential,the periodic inhomogeneous cubic-quintic nonlinearities,together with the boundary condition,support the periodic solutions with an arbitrary number of circular rings in every *** results may stimulate new matter waves in high-dimensional Schr(o)digner equations with spatially modulated nonlinearities.

关键词： inhomogeneous periodic spatially

Observation of topological charge transformations in acoustic vortex using passive periodic systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 140-147页

作者： Di-chao chen Xie Liu Changqing Xu Da-Jian Wu Ying cheng Xiao-jun Liu School of Physics and Technology Nanjing Normal University Key Laboratory of Modern Acoustics School of Physics Nanjing University

Vortex transmutation utilizes a periodic system, which not only enables the alteration of the topological charge(TC) of unstable input vortices but also facilitates their transformation into stable structures. This approach is crucial for investigating the characteristics of vortices in various wave systems. Here, we achieve acoustic vortex TC transmutation by employing a welldesigned dual-structured plate external system(DPES). The interactions between the acoustic vortex and the finite-order discrete rotational symmetry lead to the transformation of its topological charge when complete rotational symmetry is broken to Nthorder discrete symmetry. Our results experimentally demonstrate the acoustic vortex TC transmutation based on passive artificial structures, enabling numerous applications in particle manipulation and information multiplexing as well as advancing our understanding and control over free-space acoustic vortices.

关键词： acoustic vortex topological charge transformation artificial structure

Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing chen chao Wu Xiaoling Liu Biao Meng Tao chen Yu Han jun Wang Shibo Xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Activation energy

从试验注册到结果公开进一步提高临床试验的透明化

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国新药杂志 2018年第20期27卷 2357-2360页

作者：陈君超上海中医药大学药物临床研究中心上海201203

临床试验的结果公开和数据共享能真正让临床试验的研究价值得以实现。本文概述了国际上临床试验结果公开制度的发展历程和现状,包括EMA,FDA,WHO和国际医学杂志编辑委员会(ICMJE)在临床试验透明化方面政策的变化。同时讨论了临床试验结... 详细信息

临床试验的结果公开和数据共享能真正让临床试验的研究价值得以实现。本文概述了国际上临床试验结果公开制度的发展历程和现状,包括EMA,FDA,WHO和国际医学杂志编辑委员会(ICMJE)在临床试验透明化方面政策的变化。同时讨论了临床试验结果公开的趋势和优势,并对国内临床试验结果公开的实施提出启示,例如CFDA可结合药物临床试验登记与信息公示平台逐步建立配套的临床试验公开制度,以及针对学术性临床试验可把研究结果公开作为基金资助的立项要求等多项建议,以期进一步为提高国内临床试验的透明化提供参考。

关键词：临床试验透明化结果公开数据共享

考虑结构高阶振型信息的AMD低维控制器设计

在线全文

学校读者我要写书评

暂无评论

振动工程学报 2016年第6期29卷 1048-1056页

作者：滕军陈朝骏幸厚冰卢伟哈尔滨工业大学深圳研究生院广东深圳518055 福建工程学院土木工程学院福建福州350118 中国建筑第四工程局有限公司华南公司广东广州510660

为减小AMD控制系统的时滞影响,一般需对被控结构模型作减维处理,但是在减维过程中系统较小特征值对应相关的结构信息被直接舍弃,将使得低维结构缺少原结构高阶振型等信息,导致低维模型精度降低,影响控制器的设计准确性。在基于均衡截断... 详细信息

为减小AMD控制系统的时滞影响,一般需对被控结构模型作减维处理,但是在减维过程中系统较小特征值对应相关的结构信息被直接舍弃,将使得低维结构缺少原结构高阶振型等信息,导致低维模型精度降低,影响控制器的设计准确性。在基于均衡截断法和极点配置算法的低维控制器设计中,重新考虑舍弃的结构高阶信息,该信息包括原结构的高阶自振频率、高阶阻尼比以及高阶振型模态信息等,并在进行极点配置之前,先考虑该部分信息对系统极点位置的影响,在控制系统的设计阶段消除了低维模型精度低的不利影响。以10层结构为例,基于改进的低维控制器,以系统控制效果、AMD控制力及行程峰值为指标,分析了低维模型对AMD控制系统性能的影响;并以4层框架实验模型的AMD控制系统为实例,验证上述数值分析结论的正确性。

关键词：振动控制 AMD 均衡截断极点配置维数

Targeting cholesterol trafficking to mitigate axonal degeneration in hereditary spastic paraplegia

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1397-1398页

作者： Zhenyu chen Xue-jun Li Department of Biomedical Sciences University of Illinois College of Medicine RockfordRockfordILUSA Department of Bioengineering University of Illinois at ChicagoChicagoILUSA

Axonal degeneration underlies many debilitating diseases including hereditary spastic paraplegia(HSP),a genetically and clinically diverse group of disorders characterized by spasticity and weakness of the lower *** is one significant cause of chronic neurodisability due to the lack of effective treatments and a wide range of onset ages from early childhood to 70 years.

关键词： degeneration diseases hereditary

区域极点配置的状态反馈控制在高柔结构中的应用

在线全文

学校读者我要写书评

暂无评论

振动工程学报 2018年第2期31卷 265-275页

作者：李祚华陈朝骏滕军幸厚冰哈尔滨工业大学深圳研究生院广东深圳518055 福建工程学院土木工程学院福建福州350118 中国建筑第四工程局有限公司华南公司广东广州510660

AMD控制系统中被控结构一般采用简化的计算模型,导致不确定性因素的存在,包括高柔结构的质量以及刚度的偏差,将影响控制器设计的准确性,而发展高柔结构的鲁棒AMD控制策略对土木工程的结构振动控制具有重要的理论价值和工程应用前景。基... 详细信息

AMD控制系统中被控结构一般采用简化的计算模型,导致不确定性因素的存在,包括高柔结构的质量以及刚度的偏差,将影响控制器设计的准确性,而发展高柔结构的鲁棒AMD控制策略对土木工程的结构振动控制具有重要的理论价值和工程应用前景。基于区域极点配置算法设计了相应的鲁棒AMD控制器,在控制增益的计算过程中考虑不确定结构参数对计算模型精度的不利影响,以此提高了系统的稳定性。以10层结构为数值分析对象,以控制效果、AMD控制参数为指标,将所提出的控制器与基于经典极点配置算法的常规控制器进行性能对比,分析结果表明:对于含有较大不确定性的结构模型,所提出的控制方法具有更良好的控制效果以及稳定的控制参数;最后以4层框架试验模型的AMD控制系统为实例,验证上述数值分析结论的正确性。

关键词：高柔结构 AMD控制系统区域极点配置线性矩阵不等式不确定结构参数

Preparation and Performance of Ternary Early Strength Agent and Quercetin Composite Cement Sealing Material

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 130-140页

作者： LIU Jian chen Meiting JI Xiaoli XU chao WANG Chunmei Department of Safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Education Ministry Anhui University of Science and TechnologyHuainan 232001China Department of Chemical Engineering and Explosives Anhui University of Science and TechnologyHuainan 232001China

A ternary early-strengthening agent consisting of calcium formate+triethanolamine+lithium sulfate was compounded with quercetin to shorten the setting time of cementitious materials while ensuring their early *** optimum ratio of the three early-strengthening agents was determined as 0.5%calcium formate+0.04%triethanolamine+0.4%lithium sulfate by response surface *** effects of the ternary early-strengthening agent composed of calcium formate+triethanolamine(TEA)+lithium sulfate on cementitious pore sealing materials under the synergistic effect of quercetin were studied by means of the performance tests of compressive strength,fluidity,and setting time,and the microstructural characterizations of X-ray powder diffractometer(XRD),thermogravimetry(TG-DSC)and scanning electron microscopy(SEM).The study shows that the synergistic effect of ternary early-strengthening agent and quercetin forms a multi-performance composite admixture for cementitious *** best performance was obtained with the compounding scheme of 0.5%calcium formate+0.04%triethanolamine+0.4%lithium sulfate ternary early-strengthening agent and 0.05%*** compressive strength of 1,3,7,and 28 d are 94.8%,39.8%,42%,and 28%higher than those of the blank group,*** initial time and final setting time are 41 and 57 minutes,*** to the microscopic analysis,the network and fibrous C-S-H gels generated by ternary early-strengthening agents are attached to the surface promoted by quercetin,which forms skeleton support while thickening and solidifying the cement slurry,which enhances the early compressive strength of the cement-based materials.

关键词： sealing material ternary early-strengthening agent quercetin synergetic effect response surface methodology

From waste to wealth:Coal tar residue derived carbon materials as low-cost anodes for potassium-ion batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 464-475页

作者： Zhonghua Lu jun Shen Xin Zhang Lingcong chao Liang chen Ding Zhang Tao Wei Shoudong Xu College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China

Carbon materials are widely recognized as highly promising electrode materials for various energy storage system *** tar residues(CTR),as a type of carbon-rich solid waste with high value-added utilization,are crucially important for the development of a more sustainable *** this study,we employed a straightforward direct carbonization method within the temperature range of 700-1000℃to convert the worthless solid waste CTR into economically valuable carbon materials as anodes for potassium-ion batteries(PIBs).The effect of carbonization temperature on the microstructure and the potassium ions storage properties of CTR-derived carbons(CTRCs)were systematically explored by structural and morphological characterization,alongside electrochemical performances *** on the co-regulation between the turbine layers,crystal structure,pore structure,functional groups,and electrical conductivity of CTR-derived carbon carbonized at 900℃(CTRC-900H),the electrode material with high reversible capacity of 265.6m Ah·g^(-1)at 50 m A·g^(-1),a desirable cycling stability with 93.8%capacity retention even after 100 cycles,and the remarkable rate performance for PIBs were ***,cyclic voltammetry(CV)at different scan rates and galvanostatic intermittent titration technique(GITT)have been employed to explore the potassium ions storage mechanism and electrochemical kinetics of *** indicate that the electrode behavior is predominantly governed by surface-induced capacitive processes,particularly under high current densities,with the potassium storage mechanism characterized by an“adsorption-weak intercalation”*** work highlights the potential of CTR-based carbon as a promising electrode material category suitable for high-performance PIBs electrodes,while also provides valuable insights into the new avenues for the high value-added utilization of CTR.

关键词： coal tar residue carbon materials anode potassium-ion batteries high value-added