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| 1 | Climatic Warming and Humidification in the Arid Region of Northwest China: Multi-Scale Characteristics and Impacts on Ecological Vegetation显示文摘The climatic warming and humidification observed in the arid region of Northwest China(ARNC) and their impacts on the ecological environment have become an issue of concern. The associated multi-scale characteristics and environmental responses are currently poorly understood. Using data from satellite remote sensing, field observations, and the Coupled Model Intercomparison Project phase 6, this paper systematically analyzes the process and scale characteristics of the climatic warming and humidification in the ARNC and their impacts on ecological vegetation. The results show that not only have temperature and precipitation increased significantly in the ARNC over the past 60 years, but the increasing trend of precipitation is also obviously intensifying. The dryness index, which comprehensively considers the effects of precipitation and temperature, has clearly decreased, and the trend in humidification has increased. Spatially, the trend of temperature increase has occurred over the entire region, while 93.4% of the region has experienced an increase in precipitation, suggesting a spatially consistent climatic warming and humidification throughout the ARNC. Long-term trends and interannual changes in temperature and precipitation dominate the changes in climatic warming and humidification. Compared to interannual variations in temperature, the trend change of temperature contributes more to the overall temperature change. However, the contribution of interannual variations in precipitation is greater than that of the precipitation trend to the overall precipitation change. The current climatic warming and humidification generally promote the growth of ecological vegetation. Since the 1980 s,82.4% of the regional vegetation has thrived. The vegetation index has a significant positive correlation with precipitation and temperature. However, it responds more significantly to interannual precipitation variation, although the vegetation response varies significantly under different types of land use. The warming and humidification of the climate in the ARNC are probably related to intensifications of the westerly wind circulation and ascending air motions.They are expected to continue in the future, although the strength of the changes will probably be insufficient to significantly change the basic climate pattern in the ARNC. The results of this study provide helpful information for decision making related to China's 'Belt and Road' development strategies. | Qiang ZHANG Jinhu YANG Wei WANG Pengli MA Guoyang LU Xiaoyun LIU Haipeng YU Feng FANG | 2021 | Journal of Meteorological Research2021，35，1： | 19 |
| 2 | Characteristics of Extreme Temperature Event and Its Response to Regional Warming in Northwest China in Past 45 Years显示文摘Using the daily maximum and minimum temperature dataset from 128 stations from 1960 to 2004 in Northwest China,daily extreme high temperature(EHT)and extreme low temperature(ELT)thresholds were deter-mined by centesimal method for different stations at first,then yearly EHT and ELT events were counted up in differ-ent stations,and the characteristics of their spatio-temporal distribution were diagnosed at last.The study drew follow-ing conclusions:1)The consistent anomaly distribution characteristic was the most important mode of the EHT and ELT events in Northwest China.2)The spatial distribution of the EHT and ELT events can be divided into five sub-regions,namely,the north of Qinghai and west of Gansu,the north of Xinjiang,the south of Xinjiang,the east of Northwest China and the south of Qinghai.3)The EHT events showed remarkable increasing trend in all of five sub-regions,but only in the north of Qinghai and west of Gansu area,sudden change phenomenon occurred;the ELT events showed decreasing trend in all of five sub-regions,and sudden change phenomenon occurred in Northwest China except for south of Qinghai.4)In all of five sub-regions the EHT events showed remarkable 12-14yr period os-cillation,and the ELT event showed significant 13-15yr and 7-8yr period oscillation.5)The EHT and ELT events displayed remarkable positive and negative responses to regional warming of Northwest China respectively. | YANG Jinhu REN Chuanyou JIANG Zhihong | 2008 | Chinese Geographical Science2008，18，1： | 16 |
| 3 | Finite-time adaptive consensus of a class of multi-agent systems显示文摘Multi-agent systems(MASs) are ubiquitous in natural and artificial systems. This paper aims to establish the finite-time adaptive consensus criterion for a class of MASs with nonlinear dynamics. Traditionally, the finite-time consensus criterion is often established based on the prior information on Lipschitz constants and the eigenvalues of Laplacian matrix. However, it is difficult to acquire the above prior information for most real-world engineering systems. To overcome the above difficulty, this paper develops the finite-time consensus criteria for a class of MASs with nonlinear dynamics via adaptive technique. In detail, we design the finite-time distributed node-based and edge-based adaptive consensus protocols for a class of MASs with fixed and switching topologies. Numerical simulations are also given to validate the proposed finite-time adaptive consensus criterion. | LIU KeXin WU LuLu Lü JinHu ZHU HengHui | 2016 | Science China(Technological Sciences)2016，59，1： | 16 |
| 4 | Changes in terrestrial surface dry and wet conditions on the Loess Plateau(China) during the last half century显示文摘This paper,using a revised Penman-Monteith model,computed the terrestrial surface humidity index of the Loess Plateau(China) based on climatic factors of monthly mean temperature,maximum temperature,minimum temperature,relative humidity,precipitation,wind speed and sunshine duration observed on the plateau from 1961 to 2008.The temporal-spatial distribution,anomaly distribution and sub-regional temporal variations of the terrestrial surface dry and wet conditions were analyzed as well.The results showed a decreasing trend in the annual average surface humidity from the southeast to the northwest in the research area.Over the period of 1961-2008,an aridification tendency appeared sharply in the central interior region of the Loess Plateau,and less sharply in the middle part of the region.The border region showed the weakest tendency of aridification.It is clear that aridification diffused in all directions from the interior region.The spatial anomaly distribution of the terrestrial surface dry and wet conditions on the Loess Plateau can be divided into three key areas:the southern,western and eastern regions.The terrestrial annual humidity index displayed a significantly descending trend and showed remarkable abrupt changes from wet to dry in the years 1967,1977 and 1979.In the above mentioned three key areas for dry and wet conditions,the terrestrial annual humidity index exhibited a fluctuation period of 3-4 years,while in the southern region,a fluctuation period of 7-8 years existed at the same time. | YuBi YAO RunYuan WANG JinHu YANG Ping YUE DengRong LU Guo,Ju XIAO Yang WANG LinChun LIU | 2013 | Journal of Arid Land2013，5，1： | 14 |
| 5 | Cooperative guidance strategy for multiple hypersonic gliding vehicles system显示文摘Cooperative guidance strategy for multiple hypersonic gliding vehicles system with flight constraints and cooperative constraints is investigated.This paper mainly cares about the coordination of the entry glide flight phase and driving-down phase.Different from the existing results,both the attack time and the attack angle constraints are considered simultaneously.Firstly, for the entry glide flight phase, a two-stage method is proposed to achieve the rapid cooperative trajectories planning, where the control signal corridors are designed based on the quasi-equilibrium gliding conditions.In the first stage, the bank angle curve is optimized to achieve the attack angle coordination.In the second stage, the angle of attack curve is optimized to achieve the attack time coordination.The optimized parameters can be obtained by the secant method.Secondly, for the driving-down phase, the cooperative terminal guidance law is designed where the terminal attack time and attack angle are considered.The guidance law is then transformed into the bank angle and angle of attack commands.The cooperative guidance strategy is summarized as an algorithm.Finally, a numerical simulation example with three hypersonic gliding vehicles is provided for revealing the effectiveness of the acquired strategy and algorithm. | Jianglong YU Xiwang DONG Qingdong LI Zhang REN Jinhu LV | 2020 | Chinese Journal of Aeronautics2020，33，3： | 14 |
| 6 | Economic power dispatch in smart grids: a framework for distributed optimization and consensus dynamics显示文摘By using the distributed consensus theory in multi-agent systems, the strategy of economic power dispatch is studied in a smart grid, where many generation units work cooperatively to achieve an optimal solution in a local area. The relationship between the distributed optimization solution and consensus in multi-agent systems is first revealed in this paper, which can serve as a general framework for future studies of this topic. First, without the constraints of capacity limitations, it is found that the total cost for all the generators in a smart grid can achieve the minimal value if the consensus can be reached for the incremental cost of all the generation units and the balance between the supply and demand of powers is kept. Then, by designing a distributed consensus control protocol in multi-agent systems with appropriate initial conditions,incremental cost consensus can be realized and the balance for the powers can also be satisfied. Furthermore,the difficult problem for distributed optimization of the total cost function with bounded capacity limitations is also discussed. A reformulated barrier function is proposed to simplify the analysis, under which the total cost can reach the minimal value if consensus can be achieved for the modified incremental cost with some appropriate initial values. Thus, the distributed optimization problems for the cost function of all generation units with and without bounded capacity limitations can both be solved by using the idea of consensus in multi-agent systems, whose theoretical analysis is still lacking nowadays. Finally, some simulation examples are given to verify the effectiveness of the results in this paper. | Wenwu YU Chaojie LI Xinghuo YU Guanghui WEN Jinhu LU | 2018 | Science China(Information Sciences)2018，61，1： | 13 |
| 7 | Shock tube study of kerosene ignition delay at high pressures显示文摘Ignition delay times of China No.3 aviation kerosene were measured behind reflected shock waves using a heated high-pressure shock tube.Experimental conditions covered a wider temperature range of 820-1500 K,at pressures of 5.5,11 and 22 atm,equivalence ratios of 0.5,1.0 and 1.5,and oxygen concentration of 20%.Adsorption of kerosene on the shock tube wall was taken into account.Ignition delay times were determined from the onset of the excited radical OH emission in conjunction with the pressure profiles.The experimental results of ignition delay time were correlated with the equations:11 0.22 1.09 2 3.2 10 [Keros ene ] [O2] exp(69941 RT) and 7 0.88 0.23 4.72 10 P exp(62092 RT).The current measurements provide the ignition delay behavior of China No.3 aviation kerosene at high pressures and air-like O2 concentration. | LIANG JinHu WANG Su HU HongHao ZHANG ShengTao FAN BingCheng CUI JiPing | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，6： | 13 |
| 8 | Complex Cyber-Physical Networks: From Cybersecurity to Security Control显示文摘Complex cyber-physical network refers to a new generation of complex networks whose normal functioning significantly relies on tight interactions between its physical and cyber components. Many modern critical infrastructures can be appropriately modelled as complex cyber-physical networks. Typical examples of such infrastructures are electrical power grids, WWW, public transportation systems, state financial networks, and the Internet. These critical facilities play important roles in ensuring the stability of society as well as the development of economy. Advances in information and communication technology open opportunities for malicious attackers to launch coordinated attacks on cyber-physical critical facilities in networked infrastructures from any Internet-accessible place. Cybersecurity of complex cyber-physical networks has emerged as a hot topic within this context. In practice, it is also very crucial to understand the interplay between the evolution of underlying network structures and the collective dynamics on these complex networks and consequently to design efficient security control strategies to protect the evolution of these networks. In this paper, cybersecurity of complex cyber-physical networks is first outlined and then some security enhancing techniques,with particular emphasis on safety communications, attack detection and fault-tolerant control, are suggested. Furthermore, a new class of efficient secure control strategies are proposed for guaranteeing the achievement of desirable pinning synchronization behaviors in complex cyber-physical networks against malicious attacks on nodes. The authors hope that this paper motivates to design enhanced security strategies for complex cyber-physical network systems, to realize resilient and secure critical infrastructures. | WEN Guanghui YU Wenwu YU Xinghuo Lü Jinhu | 2017 | Journal of Systems Science & Complexity2017，30，1： | 11 |
| 9 | Enhanced hydrogen evolution reaction over molybdenum carbide nanoparticles confined inside single-walled carbon nanotubes显示文摘Carbon nanotubes(CNTs) have shown as unique nanoreactors to tune the catalytic activity of confined nano-catalysts. Here we report that the catalytic performance of molybdenum carbide nanoparticles(MoC_x NPs) for the hydrogen evolution reaction(HER) process can be enhanced by encapsulation within single-walled carbon nanotubes(SWNTs) with a diameter of 1–2 nm. The catalyst with MoC_x NPs located on the interior surface of SWNTs(MoCx@SWNTs) exhibits a lower onset over-potential and a smaller Tafel slope than the one with MoC_x NPs attached on the exterior surface(MoCx/SWNTs). This is likely attributed to the much smaller particle size and the more reduced states of the confined MoC_x NPs, as well as the larger specific surface area of MoCx@SWNTs compared with Mo Cx/SWNTs. In addition, the electronic structure of the confined MoC_x NPs might be modified by the confinement effects of SWNTs, and hence the adsorption free energy of H atoms on the confined MoC_x NPs, which could also contribute to their higher performance. These results suggest that the SWNTs can be further explored for constructing novel catalysts with beneficial catalytic performance. | Tingting Cui Jinhu Dong Xiulian Pan Tie Yu Qiang Fu Xinhe Bao | 2019 | Journal of Energy Chemistry2019，28，1： | 7 |
| 10 | On PID control for synchronization of complex dynamical network with delayed nodes显示文摘Over the past two decades, synchronization, as an interesting collective behavior of complex dynamical networks, has been attracting much attention. To reveal and analyze the inherent mechanism of synchronization in complex dynamical networks with time delays in nodes, this paper attempts to use PD and PI control protocols to achieve synchronization. Based on a classical network model, we investigate the PD and PI control for synchronization of complex dynamical networks with delayed nodes and obtain some sufficient conditions. By using Lyapunov functions and appropriate state transformations, we prove that global synchronization can be achieved via the above control protocols. Finally, some simulation examples are illustrated to validate the effectiveness of the proposed theoretical results. | GU HaiBo Lv JinHu LIN ZongLi | 2019 | Science China(Technological Sciences)2019，62，8： | 7 |
| 11 | STABILITY OF N-DIMENSIONAL LINEAR SYSTEMS WITH MULTIPLE DELAYS AND APPLICATION TO SYNCHRONIZATION显示文摘这篇论文进一步与多重延期调查 n 维的线性系统的稳定性。用 Laplace 变换,我们与多重延期为 n 维的线性系统介绍典型方程的一个定义。而且,一个足够的条件全球性为 Lyapunov 被达到一般 multi-delaylinear 系统的 asymptotical 稳定性。特别地,我们的结果显示出线性延期系统有的那一些 uncommensurate 是的类似的稳定性标准同量的线性延期系统的。这结果也概括陈和穆尔(2002 ) 的。最后,这条定理被用于多延期的混乱同步联合 Chua 的系统。 | Weihua DENG Jinhu LU Changpin LI | 2006 | Journal of Systems Science & Complexity2006，19，2： | 5 |
| 12 | Stable isotope analysis of water sources for Tamarix laxa in the mega-dunes of the Badain Jaran Desert, China显示文摘The complex interactions in desert ecosystems between functional types and environmental conditions could be reflected by plant water use patterns. However, the mechanisms underlying the water use patterns as well as the water sources of Tamarix laxa in the mega-dunes of the Badain Jaran Desert, China, remain unclear. This study investigated the water sources and water use patterns of T. laxa using the stable oxygen isotope method. The δ^(18)O values of xylem water, soil water in different layers(0–200 cm), rainwater, snow water, lake water, atmospheric water vapor, condensate water, and groundwater were measured. The sources of water used by T. laxa were determined using the IsoSource model. The results indicate that T. laxa mainly relies on soil water. At the beginning of the growing season(in May), the species is primarily dependent on water from the middle soil layer(60–120 cm) and deep soil layer(120–200 cm). However, it mainly absorbs water from the shallow soil layer(0–60 cm) as the rainy season commences. In September, water use of T. laxa reverts to the deep soil layer(120–200 cm). The water use patterns of T. laxa are closely linked with heavy precipitation events and soil water content. These findings reveal the drought resistance mechanisms of T. laxa and are of significance for screening species for ecological restoration. | ZHANG Jinhu WANG Nai'ang NIU Zhenmin SUN Jie DONG Chunyu ZHANG LyuLyu | 2018 | Journal of Arid Land2018，10，6： | 5 |
| 13 | Robust consensus of multi-agent systems with time-varying delays in noisy environment显示文摘Over the last ten years, the consensus of multi-agent systems (MAS) has received increasing attention from mechanics, mathematics, physics, engineering sciences, social sciences, and so on. It is well known that the robustness of consensus of MAS is usually determined by several key factors, including noise, time-delays, and packet drop. In this paper, we introduce a general time-delayed MAS model with noise and also further investigate its robust consensus. In particular, we prove that the proposed algorithm is robust against the bounded time-varying delays and bounded noises. The effectiveness and robustness of the proposed consensus algorithm has been validated in the classical Vicsek model with time-varying delays. And two simulation examples are also given to justify the above theoretical results. These results may have some potential applications in various fields, including mechanics, biology, and engineering sciences. | CHEN Yao LV JinHu YU XingHuo | 2011 | Science China(Technological Sciences)2011，54，8： | 5 |
| 14 | A threshold effect of coupling delays on intra-layer synchronization in duplex networks显示文摘This paper investigates the impact of inter-layer coupling functions and intra-layer coupling delays on intra-layer synchronization regions and sychronizability. It is found that the inter-layer coupling functions have great influence on intra-layer synchronization regions, as well as on the intra-layer synchronizability. In particular, there exists an inter-layer coupling function such that the inter-layer coupling strength neither improves nor weakens the intra-layer synchronizability. Furthermore, no matter which one of three inter-layer coupling functions is chosen, a small intra-layer delay always keeps the intra-layer synchronized regions almost unchanged, implying that the small delay neither enhances nor suppresses the intra-layer synchronizability. At the same time the delay greatly frustrates the synchronizability in each layer when it is greater than some threshold. Our results may have potential applications for interconnected technological networks where communication delays are inevitably present. | TANG LongKun LU JunAn Lü JinHu | 2018 | Science China(Technological Sciences)2018，61，12： | 4 |
| 15 | Topology inference of uncertain complex dynamical networks and its applications in hidden nodes detection显示文摘一个复杂动态网络的拓扑的结构在决定网络起一个重要作用进化机制和功能的行为,因此认出并且推断网络结构具有理论、实际的意义。尽管各种各样的途径被建议了估计网络拓扑学,许多很好没在网络个人之中被建立到网络动力学和传播延期的普遍存在的吵闹的性质。这份报纸集中于不明确的复杂动态网络的拓扑学推理。一个辅助网络被构造,一个适应计划被建议追踪拓扑的参数。考虑网络模型应当包含实际随机的不安,是引人注目的,并且吵闹的观察作为构造辅助网络的控制输入被拿。特别地,控制技术能进一步被采用找到隐藏的消息提供者(或潜伏的变量) 在网络。数字例子被提供说明建议计划的有效性。另外,联合力量并且在鉴定性能上联合延期的影响被估计。建议计划向工程师提供一条方便途径推断一般复杂动态网络的拓扑学并且找到隐藏的消息提供者,和评估能进一步便于的详细表演实际电路设计。 | WANG YingFei WU XiaoQun FENG Hui LU JunAn LU JinHu | 2016 | Science China(Technological Sciences)2016，59，8： | 4 |
| 16 | Identifying topologies and system parameters of uncertaintime-varying delayed complex networks显示文摘Node dynamics and network topologies play vital roles in determining the network features and network dynamical behaviors.Thus it is of great theoretical significance and practical value to recover the topology structures and system parameters of uncertain complex networks with available information. This paper presents an adaptive anticipatory synchronization-based approach to identify the unknown system parameters and network topological structures of uncertain time-varying delayed complex networks in the presence of noise. Moreover, during the identification process, our proposed scheme guarantees anticipatory synchronization between the uncertain drive and constructed auxiliary response network simultaneously. Particularly, our method can be extended to several special cases. Furthermore, numerical simulations are provided to verify the effectiveness and applicability of our method for reconstructing network topologies and node parameters. We hope our method can provide basic insight into future research on addressing reconstruction issues of uncertain realistic and large-scale complex networks. | WANG Xiong GU HaiBo WANG QianYao Lü JinHu | 2019 | Science China(Technological Sciences)2019，62，1： | 4 |
| 17 | Study of Aircraft Icing Warning Algorithm Based on Millimeter Wave Radar显示文摘In order to avoid accidents due to aircraft icing, an algorithm for identifying supercooled water was studied. Specifically, a threshold method based on millimeter wave radar, lidar, and radiosonde was used to retrieve the coverage area of supercooled water and a fuzzy logic algorithm was used to classify the observed meteorological targets. The macrophysical characteristics of supercooled water could be accurately identified by combing the threshold method with the fuzzy logic algorithm. In order to acquire microphysical characteristics of supercooled water in a mixed phase, the unimodal spectral distribution of supercooled water was extracted from a bimodal or trimodal spectral distribution of a mixed phase cloud, which was then used to retrieve the effective radius and liquid water content of supercooled water by using an empirical formula. These retrieved macro-and micro-physical characteristics of supercooled water can be used to guide aircrafts during takeoff, flight, and landing to avoid dangerous areas. | Jinhu WANG Junxiang GE Qilin ZHANG Pan FAN Ming WEI Xiangchao LI | 2017 | Journal of Meteorological Research2017，31，6： | 4 |
| 18 | Molecular mechanism of the Neurospora circadian oscillator显示文摘Circadian clocks are the internal time-keeping mechanisms for organisms to synchronize their cellular and physiological processes to the daily light/dark cycles.The molecular mechanisms underlying circadian clocks are remarkably similar in eukaryotes.Neurospora crassa,a filamentous fungus,is one of the best understood model organisms for circadian research.In recent years,accumulating data have revealed complex regulation in the Neurospora circadian clock at transcriptional,posttranscriptional,post-translational and epigenetic levels.Here we review the recent progress towards our understanding of the molecular mechanism of the Neurospora circadian oscillator.These advances have provided novel insights and furthered our understanding of the mechanism of eukaryotic circadian clocks. | Jinhu Guo Yi Liu | 2010 | Protein & Cell2010，1，4： | 3 |
| 19 | Cultivation effects on soil texture and fertility in an arid desert region of northwestern China显示文摘In arid desert regions of northwestern China, reclamation and subsequent irrigated cultivation have become effective ways to prevent desertification, expand arable croplands, and develop sustainable agricultural production. Improvement in soil texture and fertility is crucial to high soil quality and stable crop yield. However, knowledge on the long-term effects of the conversion of desert lands into arable croplands is very limited. To address this problem, we conducted this study in an arid desert region of northwestern China to understand the changes in soil physical-chemical properties after 0, 2, 5, 10, 17, and 24 years of cultivation. Our results showed that silt and clay contents at the 17-year-old sites increased 17.5 and 152.3 folds, respectively, compared with that at the 0-year-old sites. The soil aggregate size fraction and its stability exhibited an exponential growth trend with increasing cultivation ages, but no significant change was found for the proportion of soil macroaggregates(>5.00 mm) during the 17 years of cultivation. The soil organic carbon(SOC) content at the 24-year-old sites was 6.86 g/kg and increased 8.8 folds compared with that at the 0-year-old sites. The total(or available) nitrogen, phosphorus, and potassium contents showed significant increasing trends and reached higher values after 17(or 24) years of cultivation. Changes in soil physical-chemical properties successively experienced slow, rapid, and stable development stages, but some key properties(such as soil aggregate stability and SOC) were still too low to meet the sustainable agricultural production. The results of this long-term study indicated that reasonable agricultural management, such as expanding no-tillage land area, returning straw to the fields, applying organic fertilizer, reducing chemical fertilizer application, and carrying out soil testing for formula fertilization, is urgently needed in arid desert regions. | HE Mingzhu JI Xibin BU Dongsheng ZHI Jinhu | 2020 | Journal of Arid Land2020，12，4： | 3 |
| 20 | An overview on the designs of distributed observers in LTI multi-agent systems显示文摘With the rapid development of information technologies and cloud computing, sensor networks play an increasingly important role in our society. Over the past few decades, distributed observer theory has attracted unprecedented attention due to its wide potential applications in different areas. Meanwhile, various approaches and algorithms have been proposed and investigated. The design of distributed observers is one of the frontier topics of system and control research, which has the significant theoretical values and broad application prospects. This paper attempts to review the representative models and the corresponding approaches for distributed observer design in linear time-invariant(LTI) systems. Firstly, the research backgrounds and main advances of distributed observer designs are briefly reviewed. Then, recent results of distributed observer designs for discrete-time and continuous-time LTI multi-agent systems(MASs) are introduced in detail, respectively. Finally, the prospects and the future work directions of the design of distributed observers are put forward. The main purpose of this paper is to promote the emerging topic on the designs of distributed observers, with focuses on the interdisciplinary interest from technological sciences. | PEI YingQing GU HaiBo LIU KeXin LU JinHu | 2021 | Science China(Technological Sciences)2021，64，11： | 3 |
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