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| 1 | A broadband metamaterial cylindrical lens antenna显示文摘We present a Luneberg-like cylindrical lens antenna experimentally using metamaterials.The cylindrical lens antenna with a broad bandwidth is made up of the non-resonant I-shaped metamaterial structures.The near-field distributions of the metamaterial lens antenna are measured using a two-dimensional near-field microwave scanning apparatus,and agree well with the simulation results.The far-field radiation patterns of the antenna are also presented to show the high-gain performance in the broad bandwidth. | MA HuiFeng CHEN Xi YANG XinMi XU HongSheng CHENG Qiang CUI TieJun | 2010 | Chinese Science Bulletin2010，55，19： | 6 |
| 2 | The origin of Mosuo people as revealed by mtDNA and Y chromosome variation显示文摘The Mosuo, living in the Lugu Lake area in northwest Yunnan Province, China, is the only matriarchal population in China. The Mosuo was officially identified as Naxi nationality although its relationship with Naxi remains controversial. We studied the genetic relationship between the Mosuo and five other ethnic groups currently residing in northwest Yunnan, i.e. Naxi, Tibetan, Bai, Yi and Pumi, by typing the genetic variations in mtDNA HVS1 and 21 Y chromosome markers (13 SNPs & 8 STR markers). We showed that the maternal lineages of the Mosuo bear the strongest resemblance with those found in Naxi while its paternal lineages are more similar to those that are prevalent in Yunnan Tibetan. The marked difference between paternal and maternal lineages may be attributable to the genetic history, matriarchal structure, and visiting marriage. | WEN Bo, SHI Hong, REN Ling, XI Huifeng, LI Kaiyuan, ZHANG Wenyi, SU Bing, SI Shiheng, JIN Li & XIAO ChunjieJoined Laboratory of Human Population Genetics of Yunnan University and Fudan University, Kunming 650091, China Key Laboratory of Bioresources Conservation and Utilization & Human Genetics Center of Yunnan University, Kunming 650091, China National Key Laboratory of Genetic Engineering & Center for Anthropological Studies, School of Life Sciences, Fudan University, Shanghai 200433, China Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650031, China Center for Genome Information, Department of Environmental Health, University of Cincinnati, Cincinnati 45267, USA The Central Hospital of Ninglang County, Ninglang 674300, China | 2004 | Science China(Life Sciences)2004，47，1： | 3 |
| 3 | The dominant hepatitis B virus genotype identified in Tibet is a C/D hybrid显示文摘 | Chaoyin Cui Jinxiu Shi Lijian Hui Huifeng Xi Zhuoma Quni Tsedan and Gengxi Hu | 2002 | J Gen Virol2002，83，： | 1 |
| 4 | Numerical simulation analysis of pullout test of planting steel-A new reinforcement technique显示文摘 | Mu Jianchun Xi Huifeng | 2011 | Advance Materials Research2011，，3： | 1 |
| 5 | Unified simulation of hardening and softening effects for metals up to failure显示文摘Toward accurately simulating both hardening and softening effects for metals up to failure,a new finite strain elastoplastic J2-flow model is proposed with the yield strength therein as a function of the plastic work in the explicit form.With no need to identify any adjustable parameters,the uniaxial stress-strain response predicted from this new model is shown to automatically and accurately match any given data from monotonic uniaxial extension tests of bars.As such,the objectives in three respects are achieved for the first time,i.e.,(i)both the hardening and softening effects up to failure can be simulated in the sense of matching test data with no errors,(ii)the usual tedious implicit procedures toward identifying numerous unknown parameters need not be involved and can be totally bypassed,and(iii)the model applicability can be ensured in a broad sense for various metallic materials with markedly different transition effects from hardening to softening.With the new model,the complete response features of stretched bars and twisted tubes up to failure are studied,including the failure effects of bars under monotonic extension and tubes under monotonic torsion and,furthermore,the fatigue failure effects of bars under cyclic loading.The results show accurate agreement with the uniaxial data,and the results for both the shear stress and the normal stress at the finite torsion display realistic hardening-to-softening transition effects for the first time. | Siyu WANG Lin ZHAN Huifeng XI O.T.BRUHNS Heng XIAO | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，12： | 1 |
| 6 | Development of VME system in RPC electronics for reactor neutrino experiment at Daya Bay Nuclear Power Plant显示文摘VME system of the Resistive Plate Chamber (RPC) electronics for the Daya Bay Reactor Neutrino Experiment is described in this paper. A 9U VME RPC trigger module (RTM) is designed to process coincidence signals coming from front end cards (FECs), to generate local triggers and send them to FECs to select the hit data from RPC detector, to report trigger information to a master trigger system and receive cross triggers from the master trigger system. Another 9U VME readout module is designed to collect data from all FECs, to send out configurations to FECs, and to transmit collected hit data to the data acquisition system via VME bus. Test results prove that the VME system is capable of treating a maximum data rate (2.2 MB·s-1 ), without data loss. | HAO Huifeng LIANG Hao ZHENG Lei DOU Fei XI Jianbo ZHOU Yongzhao | 2013 | Nuclear Science and Techniques2013，24，1： | 1 |
| 7 | Energy Absorption Characteristics of a Novel Asymmetric and Rotatable Re-entrant Honeycomb Structure显示文摘Based on the symmetric re-entrant honeycomb(S-RH)structure with negative Poisson’s ratios,a novel asymmetric and rotatable re-entrant honeycomb(AR-RH)structure was proposed.Both the S-RH structure and AR-RH structure were produced by the 3D printing technology.Through experimental test and finite element simulation,the deformation mechanism and energy absorption characteristics of the AR-RH structure and the S-RH structure with negative Poisson’s ratios at different impact velocities were compared.The experimental test and finite element simulation results show that the novel AR-RH structure with negative Poisson’s ratios has stronger energy absorption capacity than the S-RH structure,and it has been verified that the rotatability of AR-RH can indeed absorb energy.Furthermore,the degree of asymmetry of the AR-RH structure was discussed. | Huifeng Xi Jiachu Xu Shende Cen Shiqing Huang | 2021 | Acta Mechanica Solida Sinica2021，34，4： | 0 |
| 8 | Full Characterization of the Work-Hardening Behavior of Metals:An Accurate and Explicit Approach显示文摘A new approach is proposed to characterize the work-hardening behavior of metals based on the stress-strain data from uniaxial extension testing.With this new approach,the yield strength as a function of the plastic work can be determined by directly fitting a wellchosen single-variable shape function to any given uniaxial data from the initial yielding up to the strength limit,in an explicit sense with no need to carry out the usual tedious trial-and-error procedures in treating nonlinear elastoplastic rate equations toward identifying numerous unknown parameters.Numerical examples show that the simulation results with the new approach are in accurate agreement with the test data. | Zan Zhou Siyu Wang Lin Zhan Huifeng Xi Heng Xiao | 2020 | Acta Mechanica Solida Sinica2020，33，4： | 0 |
| 9 | Exact simulation for direction-dependent large elastic strain responses of soft fibre-reinforced composites显示文摘An explicit form of the elastic strain-energy function for direction-dependent large elastic strain behaviors of soft fiber-reinforced composites is first presented based upon a decoupled approach for simulating complex nonlinear coupling effects.From this form,the exact closed-form solutions are then obtained for the uniaxial tension responses in the fiber and cross-fiber directions.With such exact solutions,the issue of simultaneously simulating strongly coupling nonlinear responses in the fiber and cross-fiber directions may be reduced to the issue of separately treating each decoupled uniaxial stress-strain response,thus bypassing usual complexities and uncertainties involved in identifying a large number of strongly coupled adjustable parameters.The numerical examples given are in good agreement with the experimental data for large strain responses. | Huifeng XI Guicheng ZHAO OBRUHNS Siyu WANG Heng XIAO | 2023 | Applied Mathematics and Mechanics(English Edition)2023，44，9： | 0 |
| 10 | Linkage analysis on chromosome 2 in essential hypotension pedigrees显示文摘It is a new approach to study the important genes related to the control of blood pressure by probing into hypotension and hypertension at the same time. Genome scanning on whole chromosome 2 in 8 hypotension pedigrees has been done and parameter (LOD score) and non-parameter (NPL score) were used in the linkage analysis by GENEHUNTER software. The results show the evidence of linkage between D2S112 and D2S117, indicating a number of critical genes may lie in this region and contribute to the mechanism of blood pressure regulation. Also this region has been found in the previous study in hypertension pedigrees. These genes may play an important role in the regulation of blood pressure and can also be the important candidate genes in hypertension studies. | XI Huifeng KE Yuehai XIAO Junhua LI Hongyu JIN Jianzhong HUANG Wei JIN Li LU Daru | 2002 | Chinese Science Bulletin2002，47，18： | 0 |
| 11 | New finite strain elastoplastic equations for accurately and explicitly simulating pseudoelastic-to-plastic transition effects of shape memory alloys显示文摘A new finite strain elatoplastic J2-flow model with coupling effects of both isotropic and anisotropic hardening is proposed with the co-rotational logarithmic rate.In terms of certain single-variable shape functions representing uniaxial loading and unloading curves,explicit multi-axial expressions for the three hardening quantities incorporated in the new model proposed are derived in unified forms for the purpose of automatically and accurately simulating complex pseudoelastic-to-plastic transition effects of shape memory alloys(SMAs)under multiple loading-unloading cycles.Numerical examples show that with only a single parameter of direct physical meaning for each cycle,accurate and explicit simulations may be achieved for extensive data from multiple cycle tests. | Siyu WANG Lin ZHAN Huifeng XI Heng XIAO | 2020 | Applied Mathematics and Mechanics(English Edition)2020，41，10： | 0 |
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