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Structure engineering of PtCu_(3)/C catalyst from disordered to ordered intermetallic compound with heat-treatment for the methanol electrooxidation reaction

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Nano Research 2022年第5期15卷 3866-3871页

作者： Zihao xing Jun Li Shun Wang Chenliang su Huile Jin Institute of New Materials&Industry Technology Wenzhou UniversityWenzhou 325024China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China

Platinum based alloys are hereinto the mostly used methanol oxidation ***,there are limited ways to improve the methanol oxidation reaction(MOR)performance of catalysts in terms of both activity and *** we developed a simple heat-treatment method to synthesize PtCu_(3)/C intermetallic compound catalyst with lattice *** as-prepared PtCu_(3)/C-1000 exhibited high specific activity of 3.23 mA·cm^(-1) and mass activity of 1,200 mA·mgPt^(-1),which is much higher than the PtCu_(3)/C-untreated and commercial Pt/C catalysts,*** XAS and DFT results shows the high activity of the catalyst towards MOR comes from the tightening of the Pt-M bond,which leads to the decrease of Fermi energy level and the make it difficulty in adsorbing carbon intermediates,thus releasing more active sites to promote the improvement of MOR ***,the PtCu_(3)/C-1000 shows better stability which is due to the surface-rich Pt prevents Cu from dissolution.

关键词： methanol electrooxidation PtCu_(3)alloy catalyst lattice compression composition reconstruction heat-treatment

Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder

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Particuology 2023年第6期77卷 62-70页

作者： Lichen Zhang Shuo Wang xing su Xiaodong Li Meishuai Zou School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China

The dense alumina shell on the surface of aluminum powder will hinder the combustion of aluminum powder and increase its ignition *** this study,the aluminum oxide shell layer on the surface of aluminum powder was removed with hydrofluoric acid by one-pot method,and 3-Perfluorohexyl-1,2-epoxypropane(PFHP)(F3C(CF2)5CH2C2H3O)was coated to form a uniform and controllable core-shell Al@*** core-shell AI@PFHP showed better thermal reaction and ignition *** exothermic enthalpy of Al@0.15 PFHP was increased by about 1.9 times,with lower ignition temperature(reduced by about 140℃)and longer burning duration(increased by about 1.5 times)after coating with PFHP,compared with raw aluminum *** addition,the formation of PFHP coating shell can effectively improve the hydrophobicity and corrosion resistance of aluminum powder.

关键词： Aluminumpowder Core-shell 3-Perfluorohexyl-1 2-Epoxypropane Combustion

Bayesian inference for ammunition demand based on Gompertz distribution

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Journal of Systems Engineering and Electronics 2020年第3期31卷 567-577页

作者： ZHAO Rudong SHI Xianming WANG Qian su Xiaobo SONG xing Department of Equipment Command and Management Shijiazhuang CampusArmy Engineering UniversityShijiazhuang 050003China Unit 73127 of the PLA Fuzhou 350503China The Ninth Comprehensive Training Base of Army Zhangjiakou 075000China Army Infantry College of the PLA Shijiazhuang 050003China Unit 68303 of the PLA Golmud 816000China

Aiming at the problem that the consumption data of new ammunition is less and the demand is difficult to predict,combined with the law of ammunition consumption under different damage grades,a Bayesian inference method for ammunition demand based on Gompertz distribution is *** Bayesian inference model based on Gompertz distribution is constructed,and the system contribution degree is introduced to determine the weight of the multi-source *** the case where the prior distribution is known and the distribution of the field data is unknown,the consistency test is performed on the prior information,and the consistency test problem is transformed into the goodness of the fit test *** the Bayesian inference is solved by the Markov chain-Monte Carlo(MCMC)method,and the ammunition demand under different damage grades is *** example verifies the accuracy of this method and solves the problem of ammunition demand prediction in the case of insufficient samples.

关键词： ammunition demand prediction Bayesian inference Gompertz distribution system contribution Markov chain-Monte Carlo(MCMC)method

Changes in grain-filling characteristics of single-cross maize hybrids released in China from 1964 to 2014

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Journal of Integrative Agriculture 2023年第3期22卷 691-700页

作者： GAO xing LI Yong-xiang YANG Ming-tao LI Chun-hui SONG Yan-chun WANG Tian-yu LI yu SHI yun-su Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081P.R.China

Grain filling is the physiological process for determining the obtainment of yield in cereal *** grain-filling characteristics of 50 maize brand hybrids released from 1964 to 2014 in China were assayed across multiple *** found that the grain-filling duration(54.46%)and rate(43.40%)at the effective grain-filling phase greatly contributed to the final performance parameter of 100-kernel weight(HKW).Meanwhile,along with the significant increase in HKW,the accumulated growing degree days(GDDs)for the actual grain-filling period duration(AFPD)among the selected brand hybrids released from the 1960s to the 2010s in China had a decadal increase of 23.41℃ ***,there was a decadal increase of only 19.76℃ d for GDDs of the days from sowing to physiological maturity(DPM),which was also demonstrated by a continuous decrease in the ratio between the days from sowing to silking(DS)and DPM(i.e.,from 53.24%in the 1960s to 49.78%in the 2010s).In contrast,there were no significant changes in grain-filling rate along with the release years of the selected ***,the stability of grain-filling characteristics across environments also significantly increased along with the hybrid release *** also found that the exotic hybrids showed a longer grain-filling duration at the effective grain-filling phase and more stability of the grain-filling characteristics than those of the Chinese local *** to the results of this study,it is expected that the relatively longer grain-filling duration,shorter DS,higher grain-filling rate,and steady grain-filling characteristics would contribute to the yield improvement of maize hybrids in the future.

关键词： maize(Zea mays L.) grain-filling rate grain-filling duration stability

A 3D MIL-101@rGO composite as catalyst for efficient conversion of straw cellulose into valuable organic acid

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Chinese Chemical Letters 2022年第5期33卷 2573-2578页

作者： yuan su Mengchu Lu Ruidian su Weizhi Zhou xing Xu Qian Li School of Mathematic and Quantitative Economics Shandong University of Finance and EconomicsJi’nan 250014China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266200China School of Civil Engineering Shandong UniversityJi’nan 250100China

Efficient conversion of straw cellulose to chemicals or fuels is an attracting topic today for the utiliza-tion of biomass to substitute for fossil *** development of catalysts is of vital *** this work,a composite catalyst metal-organic frameworks(MOFs)immobilized on three-dimensional reduced graphene oxide(3D-rGO)were synthesized by in situ growth of the MIL-101(Cr)within the 3D-rGO *** supporting of 3D-rGO guaranteed the dispersion and acid site density of MIL-101(Cr).The MIL-101(Cr)@3D-rGO nanocomposite possesses excellent catalytic activity,stability,recyclability and is an idea catalyst for the efficient degradation of straw cellulose into formic acid(FA),acetic acid(AA)and oxalic acid(OA).A maximum FA conversion rates of 95.36%was obtained by using MIL-101(Cr)@3D-rGO(1:1)as catalyst and hydrothermal reaction at mild conditions of 200°C for 1h in alkaline aqueous *** MIL-101(Cr)@3D-rGO nanocomposite can be reused with high catalytic activity without any collapse of structure or leaching of chromium.

关键词： Straw cellulose MIL-101(Cr) Three-dimensional graphene Catalystic conversion Organic acid

An Innovative Approach for the Short-term Traffic Flow Prediction

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Journal of Systems Science and Systems Engineering 2021年第5期30卷 519-532页

作者： xing su Minghui Fan Minjie Zhang Yi Liang Limin Guo Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Faculty of Engineering and Information Sciences University of WollongongNSW 2500Australia

Traffic flow prediction plays an important role in intelligent transportation applications,such as traffic control,navigation,path planning,etc.,which are closely related to people's daily *** the last twenty years,many traffic flow prediction approaches have been ***,some of these approaches use the regression based mechanisms,which cannot achieve accurate short-term traffic flow ***,other approaches use the neural network based mechanisms,which cannot work well with limited amount of training *** this end,a light weight tensor-based traffic flow prediction approach is proposed,which can achieve efficient and accurate short-term traffic flow prediction with continuous traffic flow data in a limited period of *** the proposed approach,first,a tensor-based traffic flow model is proposed to establish the multi-dimensional relationships for traffic flow values in continuous time ***,a CANDECOMP/PARAFAC decomposition based algorithm is employed to complete the missing values in the constructed ***,the completed tensor can be directly used to achieve efficient and accurate traffic flow *** experiments on the real dataset indicate that the proposed approach outperforms many current approaches on traffic flow prediction with limited amount of traffic flow data.

关键词： Short-term traffic flow prediction tensor CP decomposition limited amount of data

Crosstalk network among multiple inflammatory mediators in liver fibrosis

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World Journal of Gastroenterology 2019年第33期25卷 4835-4849页

作者： Han-Jing Zhangdi Si-Biao su Fei Wang Zi-yu Liang yu-Dong Yan Shan-yu Qin Hai-xing Jiang Department of Gastroenterology the First Affiliated Hospital of Guangxi Medical University

Liver fibrosis is the common pathological basis of all chronic liver diseases,and is the necessary stage for the progression of chronic liver disease to *** one of pathogenic factors,inflammation plays a predominant role in liver fibrosis via communication and interaction between inflammatory cells,cytokines,and the related signaling *** hepatocytes induce an increase in proinflammatory factors,thereby inducing the development of *** addition,it has been reported that inflammatory response related signaling pathway is the main signal transduction pathway for the development of liver *** crosstalk regulatory network leads to hepatic stellate cell activation and proinflammatory cytokine production,which in turn initiate the fibrotic *** with the past,the research on the pathogenesis of liver fibrosis has been greatly ***,the liver fibrosis mechanism is complex and many pathways involved need to be further *** review mainly focuses on the crosstalk regulatory network among inflammatory cells,cytokines,and the related signaling pathways in the pathogenesis of chronic inflammatory liver ***,we also summarize the recent studies on the mechanisms underlying liver fibrosis and clinical efforts on the targeted therapies against the fibrotic response.

关键词： Crosstalk network Inflammatory cell Cytokine signal pathway Liver fibrosis

surface Majorana flat bands in j=3/2 superconductors with singlet-quintet mixing

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Chinese Physics B 2020年第1期29卷 430-445页

作者： Jiabin yu Chao-xing Liu Department of Physics the Pennsylvania State UniversityUniversity ParkPA 16802USA

Recent experiments[Science Advances 4 eaao4513(2018)]have revealed the evidence of nodal-line superconductivity in half-Heusler superconductors,e.g.,YPt *** have suggested the topological nature of such nodal-line superconductivity and proposed the existence of surface Majorana flat bands on the(111)surface of half-Heusler *** to the divergent density of states of the surface Majorana flat bands,the surface order parameter and the surface impurity play essential roles in determining the surface *** study the effect of the surface order parameter and the surface impurity on the surface Majorana flat bands of half-Heusler superconductors based on the Luttinger *** be specific,we consider the topological nodal-line superconducting phase induced by the singlet-quintet pairing mixing,classify all the possible translationally invariant order parameters for the surface states according to irreducible representations of C3vpoint group,and demonstrate that any energetically favorable order parameter needs to break the time-reversal *** further discuss the energy splitting in the energy spectrum of surface Majorana flat bands induced by different order parameters and non-magnetic or magnetic *** propose that the splitting in the energy spectrum can serve as the fingerprint of the pairing symmetry and mean-field order *** theoretical prediction can be examined in the future scanning tunneling microscopy experiments.

关键词： surface Majorana flat band half-Heusler superconductor

A Fuzzy PID Algorithm for a Novel Miniature Spherical Robots with Three-dimensional Underwater Motion Control

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Journal of Bionic Engineering 2020年第5期17卷 959-969页

作者： Liwei Shi Yao Hu Shuxiang su Shuxiang Guo Huiming xing Xihuan Hou yu Liu Zhan Chen Zan Li Debin Xia Key Laboratory of Convergence Medical Engineering System and Healthcare Technology the Ministry of Industry and Information TechnologySchool of Life ScienceBeijing Institute of TechnologyBeijing 100081China Faculty of Engineering Kagawa University2217-20 HayashichoTakamatsuKagawa 761-0396Japan

We proposed and developed a small bionic amphibious spherical robot system for tasks such as coastal environment monitoring and offshore autonomous search and *** third-generation bionic small amphibious spherical robots have many disadvantages,such as the lack of maneuverability and a small operating *** is difficult to accomplish underwater autonomous motion control with these ***,we proposed a fourth-generation amphibious spherical ***,the amphibious spherical robot developed in this project has a small and compact design,with limited sensors and external sensing *** means that the robot has weak external information collection *** need to make the real time operation of the robot's underwater motion control system more *** this paper,we mainly used a fuzzy Proportional-Integral-Derivative(PID)control algorithm to design an underwater motion control system for a novel ***,we compared PID with fuzzy PID control methods by carrying out experiments on heading and turning bow motions to verify that the fuzzy PID is more robust and exhibits good dynamic *** also carried out experiments on the three-dimensional(3D)motion control to validate the design of the underwater motion control system.

关键词： bionic amphibious spherical robot fuzzy PID control underwater motion control system underwater three-dimensional motion water-jet thruster