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Preparation of a kind of mesoporous carbon and its performance in adsorptive desulfurization

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Journal of Natural Gas Chemistry 2009年第3期18卷 365-368页

作者： Haiyun Zhou Gang Li Xiaoxing Wang Changzi jin Yongying chen State Key Laboratory of Fine Chemicals Department of Catalysis Chemistry and Engineering Dalian University of Technology Dalian 116012 Liaoning China

Carbon materials were prepared using mesoporous silica HMS with different pore sizes as the hard templates and water-soluble phenolic resin as the carbon source. The obtained materials were characterized by powder X-ray diffraction, transmission electron microscopy and N2 physical adsorption, and were used in adsorptive desulfurization. It has been shown that the carbon material prepared using HMS with larger pore size （〉3 nm） presented uniform wormlike mesopore of 2.3 nm and large BET surface area （1903 m2/g）. The mesoporous carbon was an excellent adsorbent to remove the refractory sulfur compound in diesel, especially dibenzothiophene and 4, 6-dimethyldibenzothiophene.

关键词： phenolic resins HMS wormlike mesopore mesoporous carbon

Influence of α-clustering nuclear structure on the rotating collision system

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Nuclear Science and Techniques 2018年第12期29卷 134-141页

作者： Zhi-Wan Xu Song Zhang Yu-Gang Ma jin-Hui chen chen Zhong Department of Physics Fudan University Shanghai 200433China Department of Physics and Astronomy University ofCalifornia Los Angeles CA 90095 USA Key Laboratory of Nuclear Physics and Ion-beamApplication (MOE) Institute of Modem Physics FudanUniversity Shanghai 200433 China Shanghai Institute of Applied Physics Chinese Academy ofSciences Shanghai 201800 China

In recent years, the collective motion properties of global rotation of the symmetric colliding system in relativistic energies have been investigated. In addition, the initial geometrical shape effects on the collective flows have been explored using a hydrodynamical model, a transport model, etc. In this work, we study the asymmetric ^(12)C+^(197)Au collision at 200 GeV/c and the effect of the exotic nuclear structure on the global rotation using a multi-phase transport model. The global angular momentum and averaged angular speed were calculated and discussed for the collision system at different evolution stages.

关键词：碰撞系统原子结构旋转聚类运输模型运动性质几何形状不对称

Resonant current in coupled inertial Brownian particles with delayed-feedback control

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Frontiers of physics 2017年第6期12卷 33-41页

作者： Tian-Fu Gao Zhi-Gang Zheng jin-Can chen College of Physical Science and Technology Shenyang Normal University Shenyang 110034 China College of Information Science and Engineering Huaqiao University Xiamen 361021 China Department of Physics Xiamen University Xiamen 361005 China

The transport of a walker in rocking feedback-controlled ratchets is investigated. The walker consists of two coupled ＂feet＂ that allow the interchange of the order of particles while the walker moves. In the underdamped case, tile deterministic dynamics of the walker in a tilted asymmetric ratchet with an external periodic force is considered. It is found that delayed feedback ratchets with a switching-on- and-off dependence of the states of the system can lead to absolute negative mobility. In such a novel phenomenon, the particles move against tile bias. Moreover, the walker can acquire a series of resonant steps for different values of the current. It is interesting to find that the resonant currents of the walker are induced by tile phase locked motion that corresponds to the synchronization of the motion with the change in the frequency of the external driving. These resonant steps can be well predicted in terms of time-space symmetry analysis, which is in good agreement with dynamics simulations. The transport performances can be optimized and controlled by suitably adjusting the parameters of tile delayed-feedback ratchets.

关键词： delayed-feedback control absolute negative mobility resonant steps phase locking

A New Proof for the Harmonic-Potential Theorem

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Chinese Physics Letters 2013年第2期30卷 24-27页

作者： chen jin-Wang YANG Tao PAN Xiao-Yin Department of Physics Ningbo UniversityNingbo 315211

We investigate the time evolution of the wave function for a many-particle system in an external harmonic potential and a spatially homogeneous time-dependent driving *** time-dependent wave function is found to be a ... 详细信息

关键词： function. field. harmonic

Risk Status Identification During the Takeover of Conditionally Automated Vehicles 32

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Risk Status Identification During the Takeover of Conditiona...

ADSORPTION OF SHORT TWO-DIMENSIONAL COMPACT CHAINS

第32届中国控制与决策会议

作者： Mao Peng chen jin Sun Dihua School of Automation Chongqing University Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education

ISBN: (数字)9781728158556

ISBN: (纸本)9781728158556;9781728158563

In order to identify the risk status during the takeover from automated driving to manual driving in dangerous traffic situations,this study investigated their performance during the takeover based on *** experiment invited 38 *** all held a valid driving license.A risk status identification model was proposed based on the information of vehicle status and traffic environment *** to the rate of electrocardiogram（ECG） and the performance of takeover,the risk status was classified into three *** Pearson correlation coefficient algorithm,seven factors were selected as the feature ***,the algorithm of Random Forest（RF） was employed to establish the takeover risk status identification *** results show that the accuracy of RF is 98.8%,increasing 10.4%,17.7% and 7.3% compared with Support Vector Machine（SVM）,Classification and Regression Tree（CART） and Back Propagation Neural Network,and each risk level has good prediction ***,the results show that the space headway,longitudinal acceleration and lane departure have a great influence on the risk level,and the space headway has the strongest impact on the degree of danger during the takeover of control in Conditionally Automated Vehicles.

关键词： Automated Driving Experimental Research Takeover Risk Status Identification Driving Simulator

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Chinese Journal of Polymer Science 2006年第3期24卷 237-244页

作者： Jia-ye Su jin chen Zhao-yun Zhang 章林溪 Department of Physics Zhejiang University Hangzhou 310027 China Yangming Hospital Ningbo University

Short two-dimensional compact chains adsorbed on the attractive surface at different temperatures were investigated by using the enumeration calculation method. First we investigate the chain size and shape of adsorbed chains, such as characteristic ratios of mean-square radii of gyration 〈S^2〉x/N and 〈S^2〉y/N, shape factor 〈δ〉, and the orientation of chain bonds 〈cos^2 θ〉 to illuminate how the size and shape of adsorbed compact chains change with increasing temperatures. There are some special behaviors for the chain size and shape at low temperature, especially for strong attraction interaction. In the meantime, adsorbed compact chains have different behaviors from general adsorbed polymer chains. Some thermodynamics properties are also discussed here. Heat capacity changes non-monotonously, first increases and then reduces. The transition temperature Tc is nearly 1.0, 1.4, 2.0 and 4.2 （in the unit of To） for the case of ε = 0, -1, -2 and -4 （in the unit of kTo）, respectively. Average energy per bond increases while average Helmholtz free energy per bond decreases with increasing temperatures. From these two thermodynamics parameters we can also get another transition temperature Tc＇, and it is close to 0.7, 1.1, 1.5 and 3.4 for ε= 0, -1, -2, and -4, respectively. Therefore, Tc is greater than Tc＇ under the same condition. These investigations may provide some insights into the thermodynamics behaviors of adsorbed protein-like chains.

关键词： Adsorption of compact chain Enumeration calculation method.

Metal-free synthesis of 1,2,3-benzotriazines

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Chinese Chemical Letters 2020年第12期31卷 2989-2990页

作者： jin-Yang chen Ying-Wu Lin Wei-Min He College of Chemistry and Chemical Engineering Yangtze Normal UniversityChongqing 408000China Hunant Provinicial Key Laboratory of Materials Protection for Flectric Power and Transportation Cchangsha Univerity of Science and TecmologyChangsha 410114China School of Chemistry and Chemical Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Chemistry and Chermical Engineering University of South ChinaHengyang 421001China

The recent molecular iodine catalyzed[1,2]-rearrangement of aryl amines and 3-amino-1 H-indazolesfor the synthesis of 1,2,3-benzotriazines is highlighted.

关键词： Iodine Metal-free Rearrangement reaction 1,2,3-Benzotriazines

A new sensor bias-driven spatio-temporal fusion model based on convolutional neural networks

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Science China(Information Sciences) 2020年第4期63卷 24-39页

作者： Yunfei LI Jun LI Lin HE jin chen Antonio PLAZA Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation School of Geography and Planning Sun Yat-sen University School of Automation Science and Engineering South China University of Technology State Key Laboratory of Earth Surface Processes and Resource Ecology Institute of Remote Sensing Science and Engineering Faculty of Geographical ScienceBeijing Normal University Hyperspectral Computing Laboratory Department of Technology of Computers and CommunicationsEscuela Politécnica University of Extremadura

Owing to the tradeoff between scanning swath and pixel size, currently no satellite Earth observation sensors are able to collect images with high spatial and temporal resolution simultaneously. This limits the application of satellite images in many fields, including the characterization of crop yields or the detailed investigation of human-nature interactions. Spatio-temporal fusion(STF) is a widely used approach to solve the aforementioned problem. Traditional STF methods reconstruct fine-resolution images under the assumption that changes are able to be transferred directly from one sensor to another. However, this assumption may not hold in real scenarios, owing to the different capacity of available sensors to characterize changes. In this paper, we model such differences as a bias, and introduce a new sensor bias-driven STF model(called Bia STF) to mitigate the differences between the spectral and spatial distortions presented in traditional methods. In addition, we propose a new learning method based on convolutional neural networks(CNNs) to efficiently obtain this bias. An experimental evaluation on two public datasets suggests that our newly developed method achieves excellent performance when compared to other available approaches.

关键词： spatio-temporal fusion(STF) convolutional neural networks(CNNs) sensor bias-driven STF

Density Functional Theory Study of Water Diffusion and Clustering on Pd(111)

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Chinese Journal of Structural Chemistry 2006年第8期25卷 909-914页

作者： chen jin-Wen TU Xue-Yan TIAN Kai DAI Shu-Shan School of Chemical Science and Technology Yunnan University Kunming 650091 China School of Chemistry. and Biotechnology Yunnan Nationalities University Kunming 650031 China School of Chemistry and Chemical Engineering Hunan Universi of Science and Technology Xiangtan 411201 China

The internal structures as well as adsorption and hopping energies of monomers, dimers, trimers, tetramers, pentamers and hexamers of water on Pd（111） have been studied by density functional theory （DFT） plane-wave pseudopotential method which performs the firstprinciples quantum-mechanical calculations to explore the properties of crystals and surfaces in materials. Based on the calculations, we suppose that their absorption is via one water molecule for monomers, dimmers and trimers, but three water molecules for pentamers and hexamers. Moreover, there is one water molecule bonding with Pd atom by O atom in pentamers and hexamers, which explains why pentamers and hexamers are stable. The binding energies of polymers may be used to explain why the trimer comes close to two nearby monomers to form a stable pentamer instead of tetramer. And the difference of mobility of small water clusters is due to their different hopping energies.

关键词： density functional theory Pd(111) surface water diffusion and clustering binding energy hopping energy