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Associated Productions of HZZ and HHZ at Linear Colliders in Large Extra Dimension Model

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Communications in Theoretical Physics 2006年第3期45卷 437-446页

作者： ZHOU Ya-Jin MA Wen-gan HAN Liang ZHANG Ren-You JIANG yi Department of Modern Physics University of Science and Technology of China Hefei 230026 China

In this paper we investigate the effects of the large extra dimensions on the two processes e＋ e-→＋ H^0 Z^0 Z^0 and e^＋e^-→ H^0H^0 Z^0 at linear colliders in both unpolarized and polarized collision modes. We find that the virtual Kaluza-Klein graviton exchange can significantly enhance the cross section from their standard model expectations for these two processes. The results show that the LED effect on the process e＋ e-→＋ H^0 Z^0 Z^0 allows the observation limits on the effective scale Ms to be probed up to 9. 75 TeV and 10.1 TeV in the unpolarized and ＋-（λe＋ =1/2, λe-= -1/2） polarized beam collision modes （with Pe＋ = 0.6, Pe-=0.8）, respectively. For the process e＋ e-→＋ H^0 H^0 Z^0, these limits on Ms can be probed up to 6.06 TeV and 6.38 TeV in the unpolarized and polarized collision modes separately. We find that the λe＋ = 1/2, λe-= -1/2 polarization collision mode in both processe＋ e-→＋ H^0 Z^0 Z^0 and e＋ e-→＋ H^0 H^0 Z^0 may provide a possibility to improve the sensitivity in probing the LED effects.

关键词： large extra dimensions linear collider Higgs boson gauge boson

Temperature Field Simulation Model for Rotary Kiln of Iron Ore Oxidized Pellet

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Journal of Iron and Steel Research International 2013年第4期20卷 16-19页

作者： FAN Xiao-hui LI Jun CHEN Xu-ling WANG yi gan Min School of Minerals Processing and Bioengineering Central South University

Based on conduction,convection and radiation heat transfer among the flue gas,kiln wall,and the pellet bed material,and on the basis of the coal combustion and analysis of reaction heat of pellet induration in the rotary kiln,the temperature field model of rotary kiln was *** visual studio net,matlab and open source computer vision library as development tools,combining with the ActiveX data objects database technology,the temperature field simulation system for rotary kiln of iron ore oxidized pellet production was *** distribution of pellet and flue gas in rotary kiln was dynamically displayed.

关键词： iron ore oxidized pellet rotary kiln temperature distribution mathematical model

Optimization of anchorage support parameters for soft rock tunnel based on displacement control theory

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Journal of Mountain Science 2023年第7期20卷 2076-2092页

作者： LI gan MA Wei-bin YU Chang-yi TAO Zhi-gang WANG Feng-nian School of Civil&Environmental Engineering and Geography Science Rock mechanics Research InstituteNingbo UniversityNingbo 315000China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China CCCC First Harbor Engineering Company Co.Ltd.Tianjin 300461 CCCC-Tianjin Port Engineering Institute Co.Ltd.Tianjin 300222 State Key Laboratory for Geomechanics&Deep Underground Engineering Beijing 100083China Shanxi Transportation Technology Research and Development Co. LTDTaiyuan 030032China

In the construction of a soft rock tunnel,it is critical to accurately estimate the pre-stressed anchor support parameters for surrounding rock reinforcement;otherwise,engineering disasters may *** paper presents a support parameter selection method that aims to allow deformation as a control objective,which was applied to the tunnel located in Muzailing Highway,Min County,Dingxi City,gansu Province,*** theoretical analysis,we have identified five factors that influence pre-stressing *** selection of mechanical parameters for the rock mass was carried out using an inverse analysis *** with the measured data,the maximum displacement error of the numerical simulation results was only 0.07 *** length of anchor cable,circumferential spacing of anchor cable,longitudinal spacing,and pre-stress index are adopted as the input parameters for the support vector machine neural network model based on particle swarm optimization(PSO-LSSVM).Besides,the vault subsidence and the maximum deformation of surrounding rock are considered as output values(performance indices).The goodness of fit between the predicted values and the simulated values exceeds ***,all support parameters within the acceptable deformation range are *** optimal support variables are derived by considering the construction cost and *** field application results show that it is feasible to construct the sample database utilizing the numerical simulation approach by taking the displacement as the control target and using the neural network to specify the appropriate support parameters.

关键词： Displacement control theory Anchorage support parameters Numerical simulation PSOLSSVM Tunnel construction

A Survey on Technologies and Challenges of LTE-U

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Computer Systems Science & Engineering 2022年第4期41卷 321-337页

作者： Tong gan Shi-You Wang Qiang Ma yi-Dong Jia Yun-Yun Ma Beijing Metro Consultancy Corporation Ltd. Beijing100071China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing100083China School of Electronic Electrical and Systems Engineering University of BirminghamBirminghamB152TTUnited Kingdom

The rapid growth of mobile data trafﬁc has caused great pressure on the limited spectrum resources,and there must be some better methods to deal with this *** innovative technology of Long-Term Evolution(LTE)using the unlicensed spectrum,known as LTE-Unlicensed(LTE-U),has been proposed to effectively alleviate the shortage of authorized band ***-U has explored a lot of potential capacity in mobile communication systems with limited authorized spectrum resources,and improved the spectrum utilization of unauthorized frequency ***,LTE-U is still facing challenges in its *** this paper,we summarize the key features of LTE-U and the coex-istence of LTE-U with Wi-Fi in the unlicensed *** analyze the key technologies(including carrier aggregation,HARQ,interference cancelation,and centralized scheduling),the operating modes and deployment scenarios(including carrier aggregation LTE-U,duty cycle LTE-U,and standalone LTE-U),and the advantages(including anchored LTE-U and Standalone LTE-U scenarios),as well as main technical *** then address the different management mechanisms of LTE-U and Wi-Fi(including the differences between the MAC layer and physical layer),the types of coexistence technology classiﬁcation(including channel separation and channel sharing technologies),and directions for future *** hope that this comprehensive survey spurs further research in this promising area.

关键词： LTE-U unlicensed spectrum coexistence technology

Approaching Superior Potassium Storage of Carbonaceous Anode Through a Combined Strategy of Carbon Hybridization and Sulfur Doping

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Energy & Environmental Materials 2022年第3期5卷 944-953页

作者： Qianqian Yao Yanmei gan Zuju Ma Xiangying Qian Suzhi Cai yi Zhao Lunhui Guan Wei Huang Fujian Cross Strait Institute of Flexible Electronics(Future Technologies) Fujian Normal UniversityFuzhou 350117China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350108China School of Environmental and Materials Engineering Yantai UniversityYantai 264005China Shaanxi InstituteofFlexibleElectronics(SIFE) NorthwesternPolytechnical University(NPU)Xi’an 710072China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211800China

Carbonaceous materials are promising anode candidates for potassium-ion batteries(PIBs)given its high conductivity,stable property,and abundant resource,while its practical implementation is still hampered by its limited capacity and inferior rate ***,we report a superior carbonaceous anode through a combined strategy of carbon hybridization and heteroatom *** this composite,hollow carbon spindles(HCS)were anchored on the surface of graphene(G)followed with sulfur doping treatment,aiming to integrate the high conductivity of graphene,the good structure stability of HCS,and the S doping-induced ample active *** a PIB anode,the S-G@HCS composite can display high capacity(301 mAh g^(-1)at 0.1 A g^(-1)after 500 cycles)and long-term cyclability up to 1800 cycles at 2 A g^(-1).Impressively,it can deliver an outstanding rate capacity of 215 mAh g^(-1)at 10 A g^(-1),which is superior to most carbon anodes as-reported so far for *** and theoretical analysis manifests that the construction of graphene/amorphous carbon interface as well as S doping enables the regulation of electronic structure and ion adsorption/transportation properties of carbonaceous material,thus accounting for the high capacity and superior rate capability of S-G@HCS composite.

关键词： carbonaceous anode graphene hollow carbon spindles potassium-ion batteries sulfur doping

Bioinspired Unidirectional Liquid Transport Micro-nano Structures:A Review

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Journal of Bionic Engineering 2021年第1期18卷 1-29页

作者： Liwen Zhang Guang Liu Huawei Chen Xiaolin Liu Tong Ran yi Zhang Yang gan Deyuan Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China

Unidirectional liquid transport without any need of external energy has drawn worldwide attention for its potential applications in various fields such as microfluidics,biomedicine and mechanical *** nature,numerous creatures have evolved such extraordinary unidirectional liquid transport ability such as spider sik,Sarracenia's trichomes,and Nepenthes alata's peristome,*** review summarizes the current progresses of natural unidirectional liquid transport on 1-Dimensional(1D)linear structure and 2-Dimensional(2D)surface *** driving force of unidirectional liquid transport which is determined by unique structure exist distinct differences in *** fundamental understanding of 1D and 2D unidirectionaliquid transport especially about hierarchical structural characteristics and their transport mechanism were concentrated,and various bioinspired fabrication methods are also *** applications of bioinspired directional liquid transport are demonstrated especially in fields of microfluidies,biomedical devices and anti-icing *** newly developed smart materials,various liquid transport regulation strategies are also summarized for the control of transport speed,direction guiding,***,we provide new insights and future perspectives of the directional transport materials.

关键词： bioinspiration unidirectional liquid transport microfluidics smart materials Nepenthes alata Sarracenia trichomes

EXACT AND DISCRETIZED DISSIPATIVITY OF THE PANTOGRAPH EQUATION

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Journal of Computational Mathematics 2007年第1期25卷 81-88页

作者： Siqing gan School of Mathematical Sciences and Computing Technology Central South University Changsha 410075 China

The analytic and discretized dissipativity of nonlinear infinite-delay systems of the form x＇（t） = g（x（t）,x（qt））（q∈ （0, 1）, t 〉 0） is investigated. A sufficient condition is presented to ensure that the above nonlinear system is dissipative. It is proved the backward Euler method inherits the dissipativity of the underlying system. Numerical examples are given to confirm the theoretical results.

关键词： Infinite delay Pantograph equation Backward Euler method Dissipativity.

Synergistic impact of cocatalysts and hole scavenger for promoted photocatalytic H2 evolution in mesoporous TiO2–NiSx hybrid

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Journal of Energy Chemistry 2019年第5期28卷 45-56页

作者： yi Wei gang Cheng Jinyan Xiong Jiaxin Zhu yixin gan Mengmeng Zhang Zhen Li Shixue Dou School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan 430073HubeiChina College of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan 430200HubeiChina School of Radiation Medicine and Radiation Protection Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123JiangsuChina Institute for Superconducting and Electronic Materials University of Wollongong.North Wollongong NSW2500Australia

Photocatalytic solar energy conversion to hydrogen is sustainable and attractive for addressing the global energy and environmental issue. Herein, a novel photocatalytic system (NiS/Ni3S4 cocatalysts modified mesoporous TiO2) with superior photocatalytic hydrogen evolution capability through the synergistic impact of NiS/Ni3S4 (NiSx) cocatalyst and efficient hole scavenger has been demonstrated. The photocatalytic hydrogen evolution of TiO2-NiSx hybrids with the different content of NiSx and upon different organic hole scavengers was both investigated. The hybrid of TiO2 decorated with 3%(mole ratio of Ni^2+) NiSx cocatalyst in methanol solution showed the optimal photocatalytic hydrogen evolution rate of 981.59 μmol h^-1 g^-1 which was about 20 times higher than that of bare mesoporous TiO2. Our results suggested that the boosted hydrogen production performance is attributed to both the improved photoinduced electrons migration between NiS and Ni3S4 in cocatalyst and the high hole captured efficiency by hole scavengers of methanol.

关键词： NiS/Ni3S4 Cocatalyst Photocatalytic hydrogen evolution Mesoporous TiO2 Hole scavenger

High-efficiency second-order nonlinear processes in an optical microfibre assisted by few-layer GaSe

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Light(Science & Applications) 2020年第1期9卷 1410-1417页

作者： Biqiang Jiang Zhen Hao Yafei Ji Yueguo Hou Ruixuan yi Dong Mao Xuetao gan Jianlin Zhao MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China

The centrosymmetric nature of silica fibre precludes the realisation of second-order nonlinear processes in optical fibre ***,the integration of 2D materials with optical fibres has opened up a great opportunity to develop allfibre active ***,we demonstrate high-efficiency second-order nonlinear frequency conversions in an optical microfibre assisted with few-layer gallium selenide(GaSe)*** to the strong evanescent field of the microfibre and ultrahigh second-order nonlinearity of the GaSe nanoflakes,second harmonic generation(SHG)and sum-frequency generation(SFG)are effectively achieved with only sub-milliwatt continuous-wave(CW)lasers in the wavelength range of 1500–1620 nm,covering the C and L telecom *** SHG intensity from the microfibre is enhanced by more than four orders of magnitude with the assistance of the GaSe nanoflakes on fibre nonlinear ***,in the SFG process,the intensity transfer between different frequencies can be effectively manipulated by changing the wavelengths and powers of two pump *** realised strong second-order nonlinearity in the GaSe-integrated microfibre might expand the applications of all-fibre devices in all-optical signal processing and new light source generation at awkward wavelengths.

关键词： fibre pump nonlinear