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86篇 您的检索式:作者名="MA Lifeng"
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1Weapon target assignment problem satisfying expected damage probabilities based on ant colony algorithm显示文摘A weapon target assignment (WTA) model satisfying expected damage probabilities with an ant colony algorithm is proposed. In order to save armament resource and attack the targets effectively, the strategy of the weapon assignment is that the target with greater threat degree has higher priority to be intercepted. The effect of this WTA model is not maximizing the damage probability but satisfying the whole assignment result. Ant colony algorithm has been successfully used in many fields, especially in combination optimization. The ant colony algorithm for this WTA problem is described by analyzing path selection, pheromone update, and tabu table update. The effectiveness of the model and the algorithm is demonstrated with an example.Wang Yanxia Qian Longjun Guo Zhi Ma Lifeng 2008Journal of Systems Engineering and Electronics2008,19,5:26
2A novel mechanism of inhibiting in-stent restenosis with arsenic trioxide drug-eluting stent: Enhancing contractile phenotype of vascular smooth muscle cells via YAP pathway显示文摘Objective:Arsenic trioxide(ATO or As2O3)has beneficial effects on suppressing neointimal hyperplasia and restenosis,but the mechanism is still unclear.The goal of this study is to further understand the mechanism of ATO's inhibitory effect on vascular smooth muscle cells(VSMCs).Methods and results:Through in vitro cell culture and in vivo stent implanting into the carotid arteries of rabbit,a synthetic-to-contractile phenotypic transition was induced and the proliferation of VSMCs was inhibited by ATO.F-actin filaments were clustered and the elasticity modulus was increased within the phenotypic modulation of VSMCs induced by ATO in vitro.Meanwhile,Yes-associated protein(YAP)nuclear translocation was inhibited by ATO both in vivo and in vitro.It was found that ROCK inhibitor or YAP inactivator could partially mask the phenotype modulation of ATO on VSMCs.Conclusions:The interaction of YAP with the ROCK pathway through ATO seems to mediate the contractile phenotype of VSMCs.This provides an indication of the clinical therapeutic mechanism for the beneficial bioactive effect of ATO-drug eluting stent(AES)on in-stent restenosis(ISR).Yinping Zhao Guangchao Zang Tieying Yin Xiaoyi Ma Lifeng Zhou Lingjuan Wu Richard Daniel Yunbing Wang Juhui Qiu Guixue Wang 2021Bioactive Materials2021,6,2:13
3Aerodynamic simulation of evacuated tube maglev trains with different streamlined designs显示文摘Based on the Navier-Stokes (N-S) equations of incompressible viscous fluids and the standard k-ε turbulence model with assumptions of steady state and two dimensional conditions, a simulation of the aerodynamic drag on a maglev train in an evacuated tube was made with ANSYS/FLOTRAN software under different vacuum pressures, blockage ratios, and shapes of train head and tail. The pressure flow fields of the evacuated tube maglev train under different vacuum pressures were analyzed, and then compared under the same blockage ratio condition. The results show that the environmental pressure of 1 000 Pa in the tube is the best to achieve the effect of aerodynamic drag reduction, and there are no obvious differences in the aerodynamic drag reduction among different streamline head shapes. Overall, the bluntshape tail and the blockage ratio of 0.25 are more efficient for drag reduction of the train at the tube pressure of 1 000 Pa.Xuyong CHEN Lifeng ZHAO Jiaqing MA Yuansen LIU 2012Journal of Modern Transportation2012,20,2:11
4The approach to calculate the aerodynamic drag of maglev train in the evacuated tube显示文摘In order to study the relationships between the aerodynamic drag of maglev and other factors in the evacuated tube,the formula of aerodynamic drag was deduced based on the basic equations of aerodynamics and then the calculated result was confirmed at a low speed on an experimental system developed by Superconductivity and New Energy R&D Center of South Jiaotong University.With regard to this system a high temperature superconducting magnetic levitation vehicle was motivated by a linear induction motor(LIM) fixed on the permanent magnetic guideway.When the vehicle reached an expected speed,the LIM was stopped.Then the damped speed was recorded and used to calculate the experimental drag.The two results show the approximately same relationship between the aerodynamic drag on the maglev and the other factors such as the pressure in the tube,the velocity of the maglev and the blockage ratio.Thus,the pressure,the velocity,and the blockage ratio are viewed as the three important factors that contribute to the energy loss in the evacuated tube transportation.Jiaqing Ma Dajing Zhou Lifeng Zhao Yong Zhang Yong Zhao 2013Journal of Modern Transportation2013,21,3:10
5Effect of extrusion speed on microstructure and mechanical properties of the Mg-Ca binary alloy显示文摘This work reported the effect of extrusion speeds on the microstructures and mechanical properties of Mg-Ca binary alloy.The results showed that yield strength of the as-extruded Mg-1.2wt.%Ca alloys decrease from∼360MPa to∼258MPa as the ram speed increases from 0.4mm/s to 2.4 mm/s,and the elongation increases from∼3.9%to∼12.2%.The microstructure changes from bimodal grain feature to the complete dynamical recrystallization(DRX)with increase of the extrusion speed.The ultrafine DRXed grains in size of∼0.85μm,the numerous nano-Mg_(2)Ca particles dispersing along the grain boundaries and interiors,as well as the high density of residual dislocations,should account for the high strength.It is believed that the high degree of dynamic recrystallization and the resulting texture randomization play the critical roles in the ductility enhancement of the high-speed extruded Mg alloys.Jingren Li Aiyue Zhang Hucheng Pan Yuping Ren Zhuoran Zeng Qiuyan Huang Changlin Yang Lifeng Ma Gaowu Qin 2021Journal of Magnesium and Alloys2021,9,4:9
6Wheat genomic study for genetic improvement of traits in China显示文摘Bread wheat(Triticum aestivum L.)is a major crop that feeds 40%of the world’s population.Over the past several decades,advances in genomics have led to tremendous achievements in understanding the origin and domestication of wheat,and the genetic basis of agronomically important traits,which promote the breeding of elite varieties.In this review,we focus on progress that has been made in genomic research and genetic improvement of traits such as grain yield,end-use traits,flowering regulation,nutrient use efficiency,and biotic and abiotic stress responses,and various breeding strategies that contributed mainly by Chinese scientists.Functional genomic research in wheat is entering a new era with the availability of multiple reference wheat genome assemblies and the development of cutting-edge technologies such as precise genome editing tools,highthroughput phenotyping platforms,sequencing-based cloning strategies,high-efficiency genetic transformation systems,and speed-breeding facilities.These insights will further extend our understanding of the molecular mechanisms and regulatory networks underlying agronomic traits and facilitate the breeding process,ultimately contributing to more sustainable agriculture in China and throughout the world.Jun Xiao Bao Liu Yingyin Yao Zifeng Guo Haiyan Jia Lingrang Kong Aimin Zhang Wujun Ma Zhongfu Ni Shengbao Xu Fei Lu Yuannian Jiao Wuyun Yang Xuelei Lin Silong Sun Zefu Lu Lifeng Gao Guangyao Zhao Shuanghe Cao Qian Chen Kunpu Zhang Mengcheng Wang Meng Wang Zhaorong Hu Weilong Guo Guoqiang Li Xin Ma Junming Li Fangpu Han Xiangdong Fu Zhengqiang Ma Daowen Wang Xueyong Zhang Hong-Qing Ling Guangmin Xia Yiping Tong Zhiyong Liu Zhonghu He Jizeng Jia Kang Chong 2022Science China(Life Sciences)2022,65,9:9
7MiR-181a-5p regulates 3T3-L1 cell adipogenesis by targeting Smad7 and Tcf7I2显示文摘Dan Ouyang Lifeng Xu Lihua zhang Dongguang Guo Xiaotong Tan Xiaofang Yu Junjie Qi Yaqiong Ye Qihong Liu Yongjiang Ma Yugu Li 2016Acta Biochimica et Biophysica Sinica2016,48,11:9
8Deep electrical structure of the Sulu orogen and neighboring areas显示文摘Because of the discovery of ultrahigh pressure metamorphic (UHPM) belt beneath the Sulu (Jiangsu Province-Shandong Province) orogen, this area has become a focused subject of current geoscience, as it has a close relationship with the evolution of the orogen and the neighboring North China craton. Probing the deep structure beneath this area would be of great significance for the geological inter- pretation of this issue. In this study, we make an analysis of magnetotelluric (MT) data along a profile across the Sulu orogen to provide evidence of deep structure below this region. The profile begins in west from the North China block, extending in S129oE, across the Tan-Lu fault, Sulu UHPM zone, and Sulu high pressure metamorphic (HPM) zone, and terminates in the Yangtze block in east. We use the nonlinear conjugate gradient method and TE-TM combined mode to perform inversion and interpreta- tion of the MT data, and obtain an electrical structure image above depth of 150 km along the profile. It shows that the structure can be divided into seven sections in lateral direction, between which the electric boundaries coincide well with the major faults, such as the Tan-Lu, Haizhou-Siyang, and Ji- ashan-Xiangshui faults. In vertical direction the electrical structure can be subdivided into six layers of different resistivities. It is noted that there exist high-conductivity areas in crust below the North China block and Yangtze block, while such a feature is not present beneath the Sulu orogen, which is very different from the Dabie orogen. It is also observed that a fairly continuous zone of relatively low-resistivity exists at depths of 50-90 km of the electrical structure image, which is presumably a weak zone in the uppermost mantle. Just below this low-resistivity zone are the relatively high- resis- tivity layer of the North China block, relatively low-resistivity layer of the Sulu orogen, and relatively high-resistivity layer of the Yangtze block, all in the shallow upper mantle, respectively. From the whole 2D electrical structure image, there is no abnormally low-resistivity layer in the shallow upper mantle beneath the Sulu orogen and neighboring areas, indicating that no hot asthenoshperic material asso- ciated with lithospheric thinning exists at present.XIAO QiBin ZHAO GuoZe WANG JiJun ZHAN Yan CHEN XiaoBin TANG Ji CAI JunTao WAN ZhanSheng WANG LiFeng MA Wei ZHANG JiHong 2009Science China Earth Sciences2009,52,3:7
9Consensus control of stochastic multi-agent systems: a survey显示文摘In this article, we provide a review of the consensus control problem for stochastic multi-agent systems(MASs). Recent advances are surveyed according to the method of occurrence of the stochasticity of the MASs. First, the consensus problem is discussed for MASs, wherein individual agents are corrupted by random noises, i.e., the dynamics of agents involve stochasticity in process and/or measurement equations. Both additive noises and multiplicative noises are surveyed in detail and special attention is paid to the MASs whose dynamics are governed by It?o differential equations. Moreover, particular effort is devoted to presenting the latest progress on the consensus problem for a special type of stochastic MAS with Markovian jump parameters. Subsequently,the relevant research is summarized for MASs with noisy communication environments and stochastic sampling.Further, we provide a systematic review of the consensus problems for MASs whose communication topology varies randomly in the process of data propagation among agents. Finally, conclusions are drawn and several potential future research directions are outlined.Lifeng MA Zidong WANG Qing-Long HAN Yurong LIU 2017Science China(Information Sciences)2017,60,12:5
10Microstructural and mechanical response of ZK60 magnesium alloy subjected to radial forging显示文摘Radial forging(RF)is an economical manufacturing forging process,in which four dies arranged radially around the workpiece simultaneously act on the workpiece with high-frequency radial movement.In this study,a ZK60 magnesium alloy step-shaft bar was processed under different accumulated strains by RF at350℃.The deformation behavior,microstructure evolution,and mechanical responses of this bar were systematically investigated via numerical simulations and experiments.At the early deformation stage of forging,the material undergoes pronounced grain refinement but an inhomogeneous grain structure is formed due to the strain gradient along the radial direction.The grains in different radial parts were gradually refined by increasing the RF pass,resulting in a bimodal grained structure comprising coarse(~14.1μm)and fine(~2.3μm)grains.With the RF pass increased,the initial micro-sizeβ-phases were gradually crushed and dissolved into the matrix mostly,eventually evolving to form a higher area fraction of nano-sized Zn2 Zr spheroidal particles uniformly distributed through the grain interior.The texture changed as the RF strain increased,with the c-axes of most of the deformed grains rotating in the RD.Additionally,excellent mechanical properties including higher values of tensile strengths and ductility were attained after the three RFed passes,compared to the as-received sample.Jingfeng Zou Lifeng Ma Weitao Jia Qichi Le Gaowu Qin Yuan Yuan 2021Journal of Materials Science & Technology2021,,24:4
11MicroRNAs expression profiles in adipose tissues and liver from sex-linked dwarf and normal chickens显示文摘Yaqiong Ye Li Deng Meile Liang Lifeng Xu Lihua Zhang Yongjiang Ma Yugu Li 2014Acta Biochimica et Biophysica Sinica2014,46,8:4
12Controllable photodynamic performance via an acidic microenvironment based on two-dimensional metal-organic frameworks for photodynamic therapy显示文摘Photodynamic therapy(PDT)is a widely-used technology for cancer therapy,but conventional photosensitizers still face some drawbacks,such as hydrophobicity,inadequate pharmacokinetics,low cell/tissue specificity,and uncontrollable photodynamic performance during the therapeutic process.Herein,we present a controllable photodynamic performance based on two-dimensional metal-organic frameworks(2D Zn-TCPP MOF)that displayed a week PDT effect under a neutral environment upon exposure to a 660 nm laser due to the degeneracy of Q bands of TCPP.However,the 2D Zn-TCPP MOF showed a significantly enhanced PDT effect in an acidic environment under irradiation with a 660 nm laser due to the released TCPP from decomposed MOF structure.From the in vitro outcomes,the 2D Zn-TCPP MOF showed controllable photodynamic performance from neutral to acidic environments.Due to the acidic tumor microenvironment,the 2D Zn-TCPP MOF presented the strongest antitumor effect in vivo under irradiation with a 660 nm laser.This work offers a promising strategy to develop a next-generation photosensitizer.Lifeng Hang Tao Zhang Hua Wen Lianbao Liang Wuming Li Xiaofen Ma Guihua Jiang 2021Nano Research2021,14,3:4
13Deep eutectic solvents eutectogels:progress and challenges显示文摘Deep eutectic solvents(DESs)have received widespread attention for their advantages of good electrical conductivity,stability,environmental friendliness,and easy preparation with a wide range of applications.However,it was not until recent years that DESs were used as gel electrolytes as environmentally friendly alternatives to ionic liquids(ILs).In this mini review,we first introduce the DESs related eutectogels(or ion gels),then introduce the types and applications of the gels,the opportunities and challenges of them are also summarized.Jiake Wang Shangzhong Zhang Zhongzheng Ma Lifeng Yan 2021Green Chemical Engineering2021,2,4:4
14Multi-phase structure and electrical properties of Bi_(0.5)Li_(0.5)ZrO_3 doping K_(0.48)Na_(0.56)NbO_3 lead-free piezoelectric ceramics显示文摘(1–x)K_(0.48)Na_(0.56)NbO_3–xBi_(0.5)Li_(0.5)ZrO_3(KNN–x BLZ, x = 0–0.06) lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, and their phase structures and electric properties as well as T_C were systematically investigated. The orthorhombic–tetragonal(O–T) two phases were detected in all(1–x)K_(0.48)Na_(0.56)NbO_3–xBi_(0.5)Li_(0.5)ZrO_3 ceramics at 0.01 ≤ x ≤ 0.05. Due to the appropriate ratio between O phase and T phase(CO/C T= 45/55), high piezoelectric properties of d 33= 239 pC/N, k_p= 34%, and P_r = 25.23 μC/cm^2 were obtained at x = 0.04. Moreover, a high T_C = 348 ℃ was also achieved in KNN–x BLZ ceramic at x = 0.04. These results indicate that (1–x)K_(0.48)Na_(0.56)NbO_3–xBi_(0.5)Li_(0.5)ZrO_3 system is a promising candidate for high-temperature piezoelectric devices.Xiaoyan PENG Boping ZHANG Lifeng ZHU Lei ZHAO Ruixiao MA Bo LIU Xiaodong WANG 2018Journal of Advanced Ceramics2018,7,1:4
15Rapid on-line non-destructive detection of the moisture content of corn ear by bioelectrical impedance spectroscopy显示文摘Moisture content of corn directly affects its quality and storage time,and the rapid on-line detection of the moisture content of corn ears not threshed or in vivo in the fields is required.Because of the special shape of corn ear,the rapid,low cost and non-destructive bioelectrical impedance measurement is more suitable for its moisture content detection.Using the four-electrode method with the Agilent E4980A precision LCR meter,the electrical impedance spectroscopies of the sweet corn ears and waxy corn ears at different moisture contents were acquired.The frequency range of the detection was from 20 Hz to 2 MHz and to enhance the contact,the attached-type electrodes were wrapped in cotton soaked with 0.1%NaCl solution.The impedance data over the frequency range from 300 Hz to 5 kHz were used to obtain the parameters of the bio-impedance Cole-Cole model.The results showed a good linear correlation(coefficient of determination R2=0.960)between the equivalent parallel resistance R∞of sweet corn ear and the moisture content value determined by standard chemical method.The research proved that the bioelectrical impedance spectroscopy can be used for detecting the moisture content of corn ear.Zhao Pengfei Zhang Hanlin Zhao Dongjie Wang Zhijie Fan Lifeng Huang Lan Ma Qin Wang Zhongyi 2015International Journal of Agricultural and Biological Engineering2015,8,6:3
16Simulation of viscoelastic behavior of defected rock by using numerical manifold method显示文摘Numerical simulations of longitudinal wave propagation in a rock bar with microcracks are conducted by using the numerical manifold method which has great advantages in the simulation of discontinuities.Firstly,validation of the numerical manifold method is carried out by simulations of a longitudinal stress wave propagating through intact and cracked rock bars.The behavior of the stress wave traveling in a one-dimensional rock bar with randomly distributed microcracks is subsequently studied.It is revealed that the highly defected rock bar has significant viscoelasticity to the stress wave propagation.Wave attenuation as well as time delay is affected by the length,quantity,specific stiffness of the distributed microcracks as well as the incident stress wave frequency.The storage and loss moduli of the defected rock are also affected by the microcrack properties;however,they are independent of incident stress wave frequency.Feng REN Lifeng FAN Guowei MA 2011Frontiers of Structural and Civil Engineering2011,5,2:3
17Gender associates with both susceptibility to infection and pathogenesis of SARS-CoV-2 in Syrian hamster显示文摘Epidemiological studies of the COVID-19 patients have suggested the male bias in outcomes of lung illness.To experimentally demonstrate the epidemiological results,we performed animal studies to infect male and female Syrian hamsters with SARS-CoV-2.Remarkably,high viral titer in nasal washings was detectable in male hamsters who presented symptoms of weight loss,weakness,piloerection,hunched back and abdominal respiration,as well as severe pneumonia,pulmonary edema,consolidation,and fibrosis.In contrast with the males,the female hamsters showed much lower shedding viral titers,moderate symptoms,and relatively mild lung pathogenesis.The obvious differences in the susceptibility to SARS-CoV-2 and severity of lung pathogenesis between male and female hamsters provided experimental evidence that SARS-CoV-2 infection and the severity of COVID-19 are associated with gender.Lunzhi Yuan Huachen Zhu Ming Zhou Jian Ma Rirong Chen Yao Chen Liqiang Chen Kun Wu Minping Cai Junping Hong Lifeng Li Che Liu Huan Yu Yali Zhang Jia Wang Tianying Zhang Shengxiang Ge Jun Zhang Quan Yuan Yixin Chen Qiyi Tang Honglin Chen Tong Cheng Yi Guan Ningshao Xia 2021Signal Transduction and Targeted Therapy2021,6,4:3
18Spatiotemporal dynamics of the vegetation in Ningxia,China using MODIS imagery显示文摘The vegetation in the Ningxia Hui Autonomous Region(henceforth,Ningxia)of north-western China plays an important role in guarding regional ecological safety and sustainable development.However,it is unclear how climate affects vegetation growth in terms of seasonality and various vegetation types in Ningxia.Based on remote sensing vegetation index from 2001 to 2016,climatic parameters,and the Chinese vegetation type data,this article examines the spatiotemporal effects of climate parameters on vegetation.The relative importance to variability in the normalized difference vegetation index(NDVI)for different seasons and various vegetated types is also determined.The results demonstrate that the vegetation increased from 2001 to 2016 in Ningxia.The rate of NDVI increase was fastest in summer and slowest in spring.Areas with significant increases in vegetation occurred primarily in the southern mountain,Liupan Mountain,and central arid areas.Degraded vegetation occurred in the Yellow River irrigation area with intense human activity influence.The vegetation in most areas of Ningxia will continue to increase in the future.The sensitivity of vegetation to temperature,precipitation,sunshine duration,and wind velocity showed significantly seasonal variability.Sunshine duration and wind velocity were important climatic factors affecting vegetation growth in Ningxia.However,the impact of summer precipitation variation on summer NDVI(SMN)demonstrated a time lag effect.The impact of climate variation on vegetation was distinct among various vegetation types.Moreover,the spatial pattern of vegetation in Ningxia was also impacted by human activities.Yi HE Haowen YAN Lei MA Lifeng ZHANG Lisha QIU Shuwen YANG 2020Frontiers of Earth Science2020,14,1:3
19MicroRNA-195a-5p inhibits mouse medullary thymic epithelial cells proliferation by directly targeting Smad7显示文摘MiR-195 在在肿瘤的不同类型禁止房间增长被含有。它是否贡献 thymic 的过程上皮的房间(侦探) 增长仍然保持不清楚。在这研究,我们发现 miR-195a-5p 在从变老的老鼠孤立的侦探是高度起来调整的。进一步的实验证明 miR-195a-5p 模仿禁止的 transfection 老鼠的增长髓的 thymic 第 1 行上皮的房间(MTEC1 ) ,而在 MTEC1 的 miR-195a-5p 禁止者的 transfection 有相反的效果。另外, miR-195a-5p 没在 MTEC1 apoptosis 上有明显的效果。而且, Smad7,转变生长因素小径的一个否定管理者,被酶试金作为 miR-195a-5p 的一个直接目标证实。一起拿,我们的结果显示 miR-195a-5p 禁止 MTEC1 增长,至少部分地,经由 Smad7 的下面规定。Dongguang Guo Yaqiong Ye Junjie Qi Lifeng Xu Lihua Zhang Xiaolong Tan Zhigang Tan Xiaofang Yu Yuan Zhang Yongjiang Ma Yugu Li 2016Acta Biochimica et Biophysica Sinica2016,48,3:3
20MicroRNA-181a-5p enhances cell proliferation in medullary thymic epithelial cells via regulating TGF-β signaling显示文摘在从不同年龄的老鼠的胸腺纸巾的 miRNAs 的表示侧面在我们的以前的学习被表明了。在 miRNA 表达式侧面的综合分析以后,我们证明 miR-181a-5p 的表达式显著地在 thymic 被减少从 10- 的上皮的房间(侦探) 到 19-month-old 鼠标当与那相比在从 1-month-old 的侦探由量的反向的 transcriptase 聚合酶的鼠标锁住反应时。我们在侦探假设了那 miR-181a-5p 可能通过调整一些基因或发信号的小径与年龄相关的胸腺复杂物被联系。测试这个假设,老鼠髓的 thymic 上皮的房间(MTEC1 ) 被使用。有 miR-181a-5p 的 Transfection 模仿支持了 MTEC1 房间的增长,但是没影响 apoptosis。效果被颠倒 miR-181a-5p 的表示什么时候在 MTEC1 房间被压制。而且,转变生长因素贝它受体(Tgfbr1 ) 我被酶试金作为 miR-181a-5p 的一个直接目标证实。而且,它被发现 miR-181a-5p 的那 overexpression 下面调整 Smad3 的 phosphorylation 并且堵住了发信号的转变生长因素贝它的激活。不过,一相反地,关联在 Tgfbr1 的表示之间被观察,在侦探的 miR-181a-5p 源于不同年龄的老鼠。一起,我们提供 miR-181a-5p 可以是在侦探,和表示的增长的一个重要内长的管理者的证据在侦探的 miR-181a-5p 的层次可以与年龄相关的胸腺复杂物被联系。Dongguang Guo Yaqiong Ye Junjie Qi Lihua Zhang Lifeng Xu Xiaotong Tan Xiaofang Yu Qihong Liu Jilong Liu Yuan Zhang Yongjiang Ma Yugu Li 2016Acta Biochimica et Biophysica Sinica2016,48,9:2
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