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| 1 | Edaravone injection reverses learning and memory deficits in a rat model of vascular dementia显示文摘Edaravone 是由禁止 endothelial 损害并且由改善施加 neuroprotective 效果的新奇免费激进的 scavenger 在大脑局部缺血的 neuronal 损坏。最近, edaravone 能减轻病理和 Alzheimers 疾病病人的认知赤字,这被报导。然而,它到脉管的痴呆(VaD ) 的关联不是清楚的。在这研究,我们部分堵塞了老鼠的双边的颈动脉动脉通过手术导致长期的服的 hypoperfusion (CCH ) , VaD 的一个著名老鼠模型。水迷宫和电压降低的禁止的测试被用来评估记忆赤字。superoxide dismutase 的活动 ?( 草皮) 并且喂奶脱氢酶(LDH ) , malondialdehyde 的内容 ?(MDA ) 并且全部的反应的氧种类被测量评估氧化压力水平。西方的污点分析被用来计算 synaptic 蛋白质表达式。有为一个 5 星期的时期的 edaravone 的治疗在有 CCH 的老鼠对空间的颠倒和害怕记忆赤字有能力,这被发现。Edaravone 显著地由增加草皮活动并且减少与 CCH 在老鼠的大脑减少了氧化应力的水平 MDA, LDH,和全部的反应的氧种类的内容。而且, edaravone 处理也与 CCH 在老鼠的海马恢复了多重 synaptic 蛋白质的层次。我们的数据提供在 VaD 支持 edaravone 的 neuroprotective 效果的直接证据。我们建议氧化应力的缓和和 synaptic 蛋白质的恢复在 neuroprotection 起重要作用。 | Xu Li Fen Lu Wei Li Lingzhi Qin Yong Yao Xuerong Ge Qingkai Yu Xinliang Liang Dongmei Zhao Xiaohong Li Jiewen Zhang | 2017 | Acta Biochimica et Biophysica Sinica2017，49，1： | 14 |
| 2 | Fabrication of bulk Al-Co-Cr-Fe-Ni high-entropy alloy using combined cable wire arc additive manufacturing(CCW-AAM):Microstructure and mechanical properties显示文摘Additive manufacturing is a very promising manufacturing method widely used in various industries.In this study,for the first time,a new type of combined cable wire(CCW)with multi-element composition has been designed and developed for arc additive manufacturing(AAM)of non-equiatomic Al-Co-Cr-FeNi high-entropy alloy.CCW composed of 7 filaments and 5 elements has the advantages of high deposition efficiency,self-rotation of welding arc and energy saving capability.Thin HEA walls were fabricated under pure argon gas using cold metal transfer technology.Microstructural observations of the developed HEA reveal(i)BCC and FCC phases,(ii)Good bonding between layers and(iii)defect-free microstructure.The developed alloy exhibits high compression strength(~2.8 GPa)coupled with high plastic strain(~42%)values(possess both strength and ductility).It has been identified that by varying the heat input via torch travel speed,the microstructure and mechanical properties of the HEA can be controlled.From this feasibility study,it has been proved that the innovative CCW method can be used to manufacture HEAs with CCW-AAM.Further,the study highlights the advantage of the rapid cooling involved in the CCW-AAM process which gives rise to superior mechanical properties. | Qingkai Shen Xiangdong Kong Xizhang Chen | 2021 | Journal of Materials Science & Technology2021，，15： | 10 |
| 3 | Identity Based Encryption and Biometric Authentication Scheme for Secure Data Access in Cloud Computing显示文摘 | CHENG Hongbing RONG Chunming TAN Zhenghua ZENG Qingkai | 2012 | Chinese Journal of Electronics2012，21，2： | 10 |
| 4 | Comparisons of passive microwave remote sensing sea ice concentrations with ship-based visual observations during the CHINARE Arctic summer cruises of 2010–2018显示文摘In order to apply satellite data to guiding navigation in the Arctic more effectively,the sea ice concentrations(SIC)derived from passive microwave(PM)products were compared with ship-based visual observations(OBS)collected during the Chinese National Arctic Research Expeditions(CHINARE).A total of 3667 observations were collected in the Arctic summers of 2010,2012,2014,2016,and 2018.PM SIC were derived from the NASA-Team(NT),Bootstrap(BT)and Climate Data Record(CDR)algorithms based on the SSMIS sensor,as well as the BT,enhanced NASA-Team(NT2)and ARTIST Sea Ice(ASI)algorithms based on AMSR-E/AMSR-2 sensors.The daily arithmetic average of PM SIC values and the daily weighted average of OBS SIC values were used for the comparisons.The correlation coefficients(CC),biases and root mean square deviations(RMSD)between PM SIC and OBS SIC were compared in terms of the overall trend,and under mild/normal/severe ice conditions.Using the OBS data,the influences of floe size and ice thickness on the SIC retrieval of different PM products were evaluated by calculating the daily weighted average of floe size code and ice thickness.Our results show that CC values range from 0.89(AMSR-E/AMSR-2 NT2)to 0.95(SSMIS NT),biases range from−3.96%(SSMIS NT)to 12.05%(AMSR-E/AMSR-2 NT2),and RMSD values range from 10.81%(SSMIS NT)to 20.15%(AMSR-E/AMSR-2 NT2).Floe size has a significant influence on the SIC retrievals of the PM products,and most of the PM products tend to underestimate SIC under smaller floe size conditions and overestimate SIC under larger floe size conditions.Ice thickness thicker than 30 cm does not have a significant influence on the SIC retrieval of PM products.Overall,the best(worst)agreement occurs between OBS SIC and SSMIS NT(AMSR-E/AMSR-2 NT2)SIC in the Arctic summer. | Yuanren Xiu Zhijun Li Ruibo Lei Qingkai Wang Peng Lu Matti Leppäranta | 2020 | Acta Oceanologica Sinica2020，39，9： | 6 |
| 5 | Mesoscale simulation of discontinuous dynamic recrystallization using the cellular automaton method显示文摘A dynamic recrystallization (DRX) cellular automaton (CA) model that can mark the microstructure with DRX circle was developed. The effects of initial grain size on the stress-strain curve, mean grain size and DRX fraction were mainly investigated, and the simulated results were compared with those obtained from previous researches. The results show that the shape of the stress-strain curve is sensitive, while the stress and mean grain size at the steady state are insensitive to the initial grain size. The transition from a multiple-peak stress-strain curve to a single-peak one can be explained by variations in DRX circle fraction, and the initial grain size to make this transition is between 70 and 80 μm. | Baojun YU Xiaojun GUAN Lijun WANG Qingkai ZENG Qianqian LIU Yu CAO | 2011 | Acta Metallurgica Sinica(English Letters)2011，24，4： | 6 |
| 6 | A dynamic modeling approach for nonlinear vibration analysis of the L-type pipeline system with clamps显示文摘There exists a lot of research on the nonlinear vibration of the pipeline system with different boundary conditions.To the best of our knowledge,little research on the actual constraint of the clamp has been performed.In this paper,according to hysteresis loops of the clamp obtained from experimental test,the simplified bilinear stiffness and damping model is proposed.Then the Finite Element(FE)model of L-type pipeline system with clamps is established using Timoshenko beam theory in combination with aforementioned stiffness-damping model.Both hammering and shaker tests verify the FE model via the comparisons of natural frequencies and vibration responses.The results show that the maximum errors of natural frequencies and vibration responses are about 8.31%and 17.6%,respectively.The proposed model can simulate the dynamic characteristics of the L-type pipeline system with clamps well,which is helpful to provide some guidance for the early design stage of pipeline in aero-engine. | Qingdong CHAI Jin ZENG Hui MA Kun LI Qingkai HAN | 2020 | Chinese Journal of Aeronautics2020，33，12： | 6 |
| 7 | Compressed sensing digital receiver and orthogonal reconstructing algorithm for wideband ISAR radar显示文摘This paper proposes a novel design of intermediate frequency(IF) digital receiver for wideband inverse synthetic aperture radar(ISAR) based on compressed sensing(CS). For the convenience in engineering application, we use random sampling in the digital receiver and make it possible to digitize the wideband IF signal using a commercial off-the-shelf analog-to-digital converter with sub-Nyquist sample rate. Besides, a novel basis for the sparse representation of real-valued ISAR radar echoes is built in this paper, and an orthogonal CS reconstructing algorithm is proposed based on this. Using our proposed method, the complex-valued range profile of target can be directly reconstructed from the subsampled real raw echo. The phase information of target range profile, which is very important for the coherent processing in ISAR imaging, is well reserved during the reconstruction. As a result, the down converter and matched filter, which are essential in conventional radar receiver, can be eliminated in our CS digital receiver. A series of simulation validates our design and demonstrates the feasibility of the sub-Nyquist sampling. The simulation results of ISAR imaging verify the validity and superiority of the proposed orthogonal reconstructing method. | HOU QingKai LIU Yang FAN LiJie SU ShaoYing | 2015 | Science China(Information Sciences)2015，58，2： | 4 |
| 8 | Parameter identifications for a rotor system based on its finite element model and with varying speeds显示文摘为了为旋转的颤动完成预言,机械,一个精确有限元素(FE ) 模型和转子系统的一个有效参数鉴定方法被要求。在这研究,一个测试钻塔被用作一个转子系统的一个原型基于一个 FE 模型验证一种新奇参数鉴定技术。在改变操作速度的转子柄颤动被测量并且与 FE 结果相关。第一, FE 建模的理论和鉴定技术被介绍。然后磁盘失衡参数,僵硬和测试钻塔上的适用的支持的抑制系数被识别。有识别参数的 FE 模型的计算回答与试验性的结果比较被学习。关键词转子系统 - 有限元素模型 - 参数鉴定 - 模型确认工程被中国(50775028 ) 和中国的科技的部的国家自然科学基础为 863 高技术计划(2007AA04Z418 ) 支持。 | Qingkai Han Hongliang Yao Bangchun Wen | 2010 | Acta Mechanica Sinica2010，26，2： | 4 |
| 9 | Controllability of Spacecraft Attitude and Its Application in Reconfigurability Analysis显示文摘We review the controllability research on spacecraft attitude based on nonlinear geometry control theory.The existing studies on attitude controllability are mostly concerning the global controllability and small time local controllability(STLC).A presentation of study methods and connotation in both aspects is briefly carried out.As a necessary condition of reconfigurability,the controllability of the faulty attitude control system is studied.Moreover,two reconfigurability conditions based on controllability results that consider the actuator faults for a pyramid configuration spacecraft are provided. | YANG Hao MENG Qingkai JIANG Bin | 2019 | Transactions of Nanjing University of Aeronautics and Astronautics2019，36，2： | 3 |
| 10 | Molecular characterization of RAPD and SCAR marker linked to the frog-eye leaf spot resistance gene in soybean显示文摘Two fragments SCS362o and SCS3580 of the co-dominant marker OPS0362o&580 that were linked to the resistance gene of soybean frog-eye leaf spot have been completely sequenced. A significant insertion of 30 bp is the main reason of the polymorphism between the two fragments. The results of Southern hybridization indicate that SCS362o derives from a single- or low-copy sequence and can be used as an RFLP probe. A co-dominant SCAR marker SCSSeao&sao has been developed based on the sequences. The segregation of SCS362o&58o is similar to that of RAPD marker OPS03620&580. Significant polymorphism has been shown between resistant and susceptible genotypes when 62 soybean genotypes were surveyed for the SCAR marker. Therefore, the marker can be used in the resistance breeding of soybean frog-eye leaf spot by marker-assisted selection. | ZOU Jijun YANG Qingkai CHEN Shouyi CHEN Qingshan LIU Yaguang DONG Wei | 2000 | Chinese Science Bulletin2000，45，5： | 3 |
| 11 | STUDIES ON STRUCTURAL AND MECHANICAL PROPERTIES UNDER ISOSTATIC COMPRESSION WITH LARGE-SCALE DISCRETE ELEMENT SIMULATIONS显示文摘Granular systems undergo a jamming transition at point J simply by increasing the packing fraction. A large-scale parallel discrete element code(THDEM: TsingHua Discrete Element Method) was used to obtain a satisfying statistical description of the structural and mechanical properties near point J. The isostatic compressions of 100,000 polydispersed frictionless particles were simulated on high performance computers to clearly observe the sophisticated configurations of force chains. The first peak of the pair correlation function, coordination number, spatial distribution of the packing fraction, and stress were calculated to analyze their variations with increasing packing fraction. The critical packing fraction at point J is determined to be 0.62. The incremental stress and coordination number from point J scale well with the power law, and coincide with previous theoretical predications. The distribution of the packing fraction is a normal distribution around the average value. The standard deviation decreases with increasing packing fraction, indicating the system is more uniform with a denser packing. | Jianguo Liu Qicheng Sun Feng Jin Qingkai Liu | 2014 | Acta Mechanica Solida Sinica2014，27，2： | 3 |
| 12 | System distortion analysis and compensation of DIFS signals for wideband imaging radar显示文摘System distortion is inevitable in wideband imaging radar, which needs to be compensated precisely.In traditional wideband imaging radar for space surveillance, a linear frequency modulation signal is transmitted and the echoed signal is received with dechirping processing. In this case, the system distortion changes with the target range, making it hard to compensate the distortion. However, the direct intermediate frequency sampling(DIFS) signal maintains the complete system distortion and avoids the range variant distortion in the dechirped signal. Therefore, it is more convenient to perform system compensation in DIFS signal. In this paper, the distortion factors affecting the wideband radar systems are introduced. Then, the influence of the amplitude phase distortion on the focusing quality is analyzed in detail. Finally, a system compensation method in the frequency domain based on least squares estimation is proposed. In the proposed method, the compensation vectors are extracted from the calibration tower echoes for DIFS compensation. Inverse synthetic aperture radar imagery of targets can be achieved with improved focus quality. Simulations and real-data experiments confirm the effectiveness of the proposal. | LIU Yang HOU QingKai XU ShiYou TIAN Biao | 2015 | Science China(Information Sciences)2015，58，2： | 3 |
| 13 | External synchronization of two dynamical systems with uncertain parameters显示文摘External synchronization is addressed as two or more dynamical systems with synchronous motions,which is also regarded as master-slave system.In this paper,two dynamical systems,one employs a hysteretic term to model the friction phenomenon,the other involves a hardening stiffness component with the third order of displacement due to flexible deformation,are controlled to converge to the same trajectory.The control strategy is extended from feedback control for all parameters known to adaptive control for linear parameters unknown and all parameters unknown.The slave system can keep synchronous motions with the movements of master via the designed control strategy even all the parameters are not known.The stability of synchronization error,the transient process into synchronization and the effects of parameters on the designed controller using different control strategies are investigated.The simulation results unfold the feasibility and effectiveness of this synchronization method. | HAN QingKai 1,SUN XiaoYu 2,YANG XiaoGuang 3 &WEN BangChun 1 1 School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110004,China 2 School of Electrical Engineering,Shenyang University of Technology,Shenyang 110023,China 3School of Mechanical Engineering,The University of Birmingham,Birmingham,B15 2TT,UK | 2010 | Science China(Technological Sciences)2010，53，3： | 3 |
| 14 | Balancing method without trial weights for rotor systems based on similitude scale model显示文摘 | Ruiduo YE Liping WANG Xiaojie HOU Zhong LUO Qingkai HAN | 2018 | Frontiers of Mechanical Engineering2018，13，4： | 3 |
| 15 | MyShake一个跨界的系统:智能手机用于地震预警显示文摘在城市地区发生的大地震可以造成重大人员伤亡,引发社会和经济灾难。地震预警(Earthquake Early Warning,EEW)可以提供秒到分钟的警报,让人们转移到安全区,使工厂停工,车辆减速和刹车。目前世界上只在少数国家使用传统的地震台网和大地测量观测网运行EEW系统。智能手机比传统地震台网更为广泛和普及,它内置了可检测地震的加速度计。我们开发了一种新的测震系统称为MyShake,它利用智能手机内置传感器来收集数据并分析地震。智能手机MyShake系统可以从日常的各种震动中检测到距手机10km或以内的5级地震。这些数据汇集到观测中心,经过一定的算法处理,可以实时测定地震的位置和震级,发出地震预警信息,证明我们的理念是可行的。对没有地震预警系统的区域,MyShake系统可提供地震预警,而对有预警系统的区域,MyShake系统是对原系统预警能力的补充和增强。此外,该系统地震波形记录可以用来提供快速地震烈度图,以评估地震对建筑物的影响,还可以获取地球内部浅层结构图像和地震破裂过程。 | Qingkai Kong Richard M Allen Louis Schreier Young-Woo Kwon 陈会忠(译) 张晁军(译) 沈萍(译) 李卫东(校) | 2016 | 国际地震动态2016，0，6： | 3 |
| 16 | Sea ice conditions and navigability through the Northeast Passage in the past 40 years based on remote-sensing data显示文摘Sea ice conditions and navigability along four typical routes of the Northeast Passage(NEP)are analysed using remote-sensing data from 1979 to 2019.The influence of air temperature(T_(air))and surface wind on the sea ice concentration(SIC)and the navigability of routes is determined.It is found that the annually averaged SICs of the different routes have decreased over the past 41 years.The fastest rate of decrease occurred in the Kara Sea(∼−1%per year),while the slowest rates of decrease occurred in the Laptev/East Siberian Sea(∼−0.42%per year).The number of navigable days for the Kara Sea has become∼1–2 months longer than the Laptev/East Siberian Sea route as a result.The effect of T_(air) on SIC,quantified byΔSIC/ΔT_(air) in the routes through the eastern Kara Sea and Laptev/East Siberian Sea in 2010s was∼−0.04/℃,two to three times that seen during the 1980s.Air temperature is becoming a significant driving force of melting ice in these routes.Surface winds are also a crucial factor for the navigability of the Vilkitsky Strait and Long Strait,as they drive ice drift,and affect the navigability of the Kara Strait by introducing warm air. | Miao Yu Peng Lu Zhiyuan Li Zhijun Li Qingkai Wang Xiaowei Cao Xiaodong Chen | 2021 | International Journal of Digital Earth2021，14，5： | 3 |
| 17 | Similitude design for the vibration problems of plates and shells: A review显示文摘 | Yunpeng ZHU You WANG Zhong LUO Qingkai HAN Deyou WANG | 2017 | Frontiers of Mechanical Engineering2017，12，2： | 3 |
| 18 | Distributed tracking for networked Euler-Lagrange systems without velocity measurements显示文摘The problem of distributed coordinated tracking control for networked Euler-Lagrange systems without velocity measurements is investigated. Under the condition that only a portion of the followers have access to the leader, sliding mode estimators are developed to estimate the states of the dynamic leader in finite time. To cope with the absence of velocity measurements,the distributed observers which only use position information are designed. Based on the outputs of the estimators and observers,distributed tracking control laws are proposed such that all the followers with parameter uncertainties can track the dynamic leader under a directed graph containing a spanning tree. It is shown that the distributed observer-controller guarantees asymptotical stability of the closed-loop system. Numerical simulations are worked out to illustrate the effectiveness of the control laws. | Qingkai Yang Hao Fang Yutian Mao Jie Huang | 2014 | Journal of Systems Engineering and Electronics2014，25，4： | 2 |
| 19 | JASMIN: a parallel software infrastructure for scientific computing显示文摘 | Zeyao Mo Aiqing Zhang Xiaolin Cao Qingkai Liu Xiaowen Xu Hengbin An Wenbing Pei Shaoping Zhu | 2010 | Frontiers of Computer Science in China2010，，4： | 2 |
| 20 | Achievement of chaotic synchronization trajectories of master-slave manipulators with feedback control strategy显示文摘This paper addresses a master-slave synchronization strategy for complex dynamic systems based on feedback control.This strategy is applied to 3-DOF planar manipulators in order to obtain synchronization in such complicated as chaotic motions of end-effectors.A chaotic curve is selected from Duffing equation as the trajectory of master end-effector and a piecewise approximation method is proposed to accurately represent this chaotic trajectory of end-effectors.The dynamical equations of master-slave manipulators with synchronization controller are derived, and the Lyapunov stability theory is used to determine the stability of this controlled synchronization system.In numerical experiments,the synchronous motions of end-effectors as well as three joint angles and torques of master-slave manipulators are studied under the control of the proposed synchronization strategy.It is found that the positive gain matrix affects the implementation of synchronization control strategy.This synchronization control strategy proves the synchronization's feasibility and controllability for complicated motions generated by master-slave manipulators. | Qingkai Han Lina Hao Hao Zhang Bangchun Wen | 2010 | Acta Mechanica Sinica2010，26，3： | 2 |
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