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| 1 | A class of discounted models for singular diffusion control显示文摘A kind of discounted problems for singular diffusion control have been studied. The drift and diffusion coefficients of state process are nonlinear. The class of models has been basically extended from a corresponding one established by Karatzes et al. before. By applying some analysis methods different from earlier works, the sufficient and necessary conditions of the existence of optimal control have been obtained. If an optimal control exists, it is a 'transient reflection' of state process for two lines. | LIU Kunhui, QIN Mingda & LU Chuanlai1. College of Sciences, Northern Jiaotong University, Beijing 100044, China 2. Department of Mathematics and Mechanics, Beijing University of Science and Technology, Beijing 100083 .China 3. Department of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China Correspondence should be addressed to Lu Chuanlai | 2000 | Chinese Science Bulletin2000，45，5： | 17 |
| 2 | Climatic and lake environmental changes in the Serling Co region of Tibet over a variety of timescales显示文摘The Serling Co region is located at the transitional zone of the interaction between the Indian monsoon and the westerlies over the Tibetan Plateau. The Serling Co lake covers a water area of2,389 km2(June 2017) in a 45,530 km2drainage basin. Under the dramatic hydro-meteorological changes on the Tibetan Plateau in recent decades, and complex hydrological compositions of rivers and lakes in the basin, the lake area expanded by 43%, from1,667 km2in 1976, to 2,389 km2in 2017 (1)In 2014 it surpassed Nam Co as the largest lake on the Tibetan Plateau [2], and exerts significant effect on regional environmental conditions. | Liping Zhu Junbo Wang Jianting Ju Ning Ma Yinsheng Zhang Chong Liu Boping Han Linshan Liu Mingda Wang Qingfeng Ma | 2019 | Science Bulletin2019，64，7： | 13 |
| 3 | Classification of Tibetan lakes based on variations in seasonal lake water temperature显示文摘Widespread lakes on the Tibetan Plateau(TP)are valuable archives for investigating climate and environment changes, which could provide essential information on the mechanisms of past climate changes on the TP and their interaction with the global climate systems.However, there is a lack of in-depth investigation of modern limnological processes in the Tibetan lakes, which hampers the understanding of paleolimnological records and lake ecosystem succession. In this study, we performed continuous temperature monitoring at two lakes, Bangong Co, a freshwater lake in the western TP, and Dagze Co, a brackish lake in the central TP, in order to characterize the patterns of seasonal temperature variability, stratification,and mixing. Temperature data for an entire hydrological year demonstrate that Bangong Co is a dimictic lake and that Dagze Co is a meromictic lake. The higher salinity in the deep water at Dagze Co prevents the lake from overturning completely, and this finding is supported by simulations using a physical limnological model Lake Analyzer. Continuous lake water temperature monitoring provides fundamental data for classifying Tibetan lakes, as well as the hydrological basis for understanding their paleolimnological records and ecosystem succession. | Mingda Wang Juzhi Hou Yanbin Lei | 2014 | Chinese Science Bulletin2014，59，34： | 10 |
| 4 | Distribution of GDGTs in lake surface sediments on the Tibetan Plateau and its influencing factors显示文摘Quantitative paleotemperature records are vital not only for verifying and improving the accuracy of climate model simulations, but also for estimating the amplitude of temperature variability under global warming scenarios. The Tibetan Plateau(TP) affects atmospheric circulation patterns due to its unique geographical location and high elevation, and studies of the mechanisms of climate change on the TP are potentially extremely valuable for understanding the relationship of the region with the global climate system. With the development of biomarker-based proxies, it is possible to use lake sediments to quantitatively reconstruct past temperature variability. The source of Glycerol Dialkyl Glycerol Tetraethers(GDGTs) in lake sediments is complex, and their distribution is controlled by both climatic and environmental factors. In this work, we sampled the surface sediments of 27 lakes on the TP and in addition obtained surface soil samples from six of the lake catchments. We analyzed the factors that influence GDGT distribution in the lake sediments, and established quantitative relationship between GDGTs and Mean Annual Air Temperature(MAAT). Our principal findings are as follows: the majority of GDGTs in the lake sediments are b GDGTs, followed by crenarchaeol and GDGT-0. In most of the lakes there were no significant differences between the GDGT distribution within the lake sediments and the soils in the same catchment, which indicates that the contribution of terrestrial material is important. i GDGTs in lake sediments are mainly influenced by water chemistry parameters(p H and salinity), and that in small lakes on the TP, TEX_(86) may act as a potential proxy for lake p H; however, in contrast b GDGTs in the lake sediments are mainly controlled by climatic factors. Based on the GDGT distribution in the lake sediments, we used proxies(MBT, CBT) and the fractional abundance of b GDGTs(f_(abun)) to establish calibrations between GDGTs and MAAT, respectively, which potentially provide the basis for paleoclimatic reconstruction on the TP. | WANG MingDa LIANG Jie HOU JuZhi HU Liang | 2016 | Science China Earth Sciences2016，59，5： | 8 |
| 5 | Lithium metal batteries for high energy density:Fundamental electrochemistry and challenges显示文摘The dependence on portable devices and electrical vehicles has triggered the awareness on the energy storage systems with ever-growing energy density.Lithium metal batteries(LMBs)has revived and attracted considerable attention due to its high volumetric(2046 m Ah cm-3),gravimetric specific capacity(3862 m Ah g^(-1))and the lowest reduction potential(-3.04 V vs.SHE.).However,during the electrochemical process of lithium anode,the growth of lithium dendrite constitutes the biggest stumbling block on the road to LMBs application.The undesirable dendrite not only limit the Coulombic efficiency(CE)of LMBs,but also cause thermal runaway and other safety issues due to short-circuits.Understanding the mechanisms of lithium nucleation and dendrite growth provides insights to solve these problems.Herein,we summarize the electrochemical models that inherently describe the lithium nucleation and dendrite growth,such as the thermodynamic,electrodeposition kinetics,internal stress,and interface transmission models.Essential parameters of temperature,current density,internal stress and interfacial Li+flux are focused.To improve the LMBs performance,state-of-the-art optimization procedures have been developed and systematically illustrated with the intrinsic regulation principles for better lithium anode stability,including electrolyte optimization,artificial interface layers,threedimensional hosts,external field,etc.Towards practical applications of LMBs,the current development of pouch cell LMBs have been further introduced with different assembly systems and fading mechanism.However,challenges and obstacles still exist for the development of LMBs,such as in-depth understanding and in-situ observation of dendrite growth,the surface protection under extreme condition and the self-healing of solid electrolyte interface. | Mingda Gao Hui Li Li Xu Qing Xue Xinran Wang Ying Bai Chuan Wu | 2021 | Journal of Energy Chemistry2021，30，8： | 6 |
| 6 | An improved modeling of precipitation phase and snow in the Lancang River Basin in Southwest China显示文摘Precipitation phase(e.g., rainfall and snowfall) and snow(e.g., snowpack and snowmelt runoff) in high-mountain regions may largely affect runoff generation, which is critical to water supply, hydropower generation, agricultural irrigation, and ecosystems downstream. Accurately modeling precipitation phase and snow is therefore fundamental to developing a better understanding of hydrological processes for high-mountain regions and their lower reaches. The Lancang River(LR, or the Upper Mekong River)in China, among the most important transboundary rivers originating from the Tibetan Plateau, features active dam construction and complex water resources allocation of various stakeholders in Southeast Asian countries under climate change. This study aims to improve precipitation phase and snow modeling for the LR basin with a hydrological model and multisource remotely sensed data. Results show that joint use of the Moderate Resolution Imaging Spectroradiometer(MODIS) land surface temperature product with high spatial resolution(1 km×1 km) and an air temperature product can more precisely distinguish precipitation phase than air and wet-bulb temperature products in the LR basin. Snowfall and snowmelt were found to be controlled primarily by rainfall and snowfall temperature thresholds in snow modeling. The rainfall and snowfall temperature thresholds derived from the hydrological model through calibration with remotely sensed snowpack at basin scales were considerably lower than those derived from in situ observations. Rainfall and snowfall temperature thresholds derived from in situ observations could lead to the overestimation of snowmelt runoff due mostly to the lack of representation of point-based measurements at basin scales. This study serves as a basis for better modeling and predicting snow for the LR basin and potentially other similar basins globally. | HAN ZhongYing LONG Di HAN PengFei HUANG Qi DU MingDa HOU AiZhong | 2021 | Science China(Technological Sciences)2021，64，7： | 6 |
| 7 | MicroRNA-132 in the Adult Dentate Gyrus is Involved in Opioid Addiction Via Modifying the Differentiation of Neural Stem Cells显示文摘MicroRNA-132(miR-132), a small RNA that regulates gene expression, is known to promote neurogenesis in the embryonic nervous system and adult brain.Although exposure to psychoactive substances can increase miR-132 expression in cultured neural stem cells(NSCs)and the adult brain of rodents, little is known about its role in opioid addiction. So, we set out to determine the effect of miR-132 on differentiation of the NSCs and whether this effect is involved in opioid addiction using the rat morphine self-administration(MSA) model. We found that miR-132 overexpression enhanced the differentiation of NSCs in vivo and in vitro. Similarly, speci?c overexpression of miR-132 in NSCs of the adult hippocampal dentate gyrus(DG) during the acquisition stage of MSA potentiated morphine-seeking behavior. These ?ndings indicate that miR-132 is involved in opioid addiction,probably by promoting the differentiation of NSCs in the adult DG. | Meng Jia Xuewei Wang Haolin Zhang Can Ye Hui Ma Mingda Yang Yijing Li Cailian Cui | 2019 | Neuroscience Bulletin2019，35，3： | 6 |
| 8 | Bathymetry predicting using the altimetry gravity anomalies in South China Sea显示文摘In South China Sea(112°E-119°E, 12°N-20°N), 81159 ship soundings published by NGDC(National Geophysics Data Center) and the altimetry gravity anomalies published by SIO(Scripps Institute of Oceanography) were used to predict bathymetry by GGM(gravity-geologic method) and SAS(Smith and Sandwell) method respectively. The residual 40576 ship soundings were used to estimate precisions of the predicted bathymetry models. Results showed that: the standard deviation of difference between the GGM model and ship soundings was 59.75 m and the relative accuracy was 1.86%. The SAS model is60.07 m and 1.87%. The power spectral densities of the ETOPO1, SIO, GGM and SAS models were also compared and analyzed. At last, we presented an integrated bathymetry model by weighted averaging method, the weighted factors were determined by precisions of the ETOPO1, SIO, GGM, and SAS model respectively. | Zhongmiao Sun Mingda Ouyang Bin Guan | 2018 | Geodesy and Geodynamics2018，9，2： | 3 |
| 9 | Application of orthogonal design to the extraction and HPLC analysis of sedimentary pigments from lakes of the Tibetan Plateau显示文摘沉积颜料是在湖、海洋的生态系统的浮游植物生物资源,社区结构,主要生产率和人的影响的有用代理指示物。颜料由于他们的复杂化学结构是相对易变的,它做质问的沉积颜料的抽取和分析。另外,选择适当方法在缺乏以前的调查的区域学习沉积颜料是重要的。在这研究,我们采用了 L 9(34) 开发抽取和 HPLC (高效液体层析) 的方法的直角的设计在西藏的高原上的二个湖的沉积颜料的分析:meromictic lake-Dagze 公司和 dimictic lake-Jiang 公司直角的设计为抽取和 HPLC 分析包括各种各样的参数的 9 联合。结果证明溶剂的类型和体积是为颜料抽取的最重要的因素,并且活动阶段和列选择为 HPLC 分析是最重要的。为学习地点,我们发现提取沉积颜料的最好的方法如下:acetone:methanol:water 的混合物的使用(80:15:5, v:v:v ) 作为抽取溶剂;10 mL/g 的 solvent/ 样品比率;为 30 s 的 sonication 和为 6 h 的站的抽取。为 HPLC 分析的最好的方法如下:加有活动阶段 A 的 C8 列的 Zorbax 日蚀, methanol:acetonitrile:0.25 M 水的 pyridine (50:25:25, v:v:v ) 并且活动阶段 B,甲醇:acetonitrile:丙酮(20:60:20, v:v:v ) ;活动阶段 A 的 pH 与醋酸适应了 6;并且 HPLC 列温度在 40 | LIANG Jie LI Dong WANG MingDa ZHANG XinYu HOU JuZhi | 2016 | Science China Earth Sciences2016，59，6： | 3 |
| 10 | Electronic structure, chemical bond and thermal stability of hydrogen absorber Li_2MgN_2H_2显示文摘The lowest total energy crystal structure of Li2MgN2H2 was identified by the first principle calculation with RPBE exchange-correlation function. Furthermore, the fine structure parameters of this crystal structure were calculated with PBE and PW91 exchange-correlation function. In a further step, the density of states, electron density, charge density difference on (0 0 1) plane and heat of formation of Li2MgN2H2 hydrogenation were computed with PW91 exchange-correlation function. Consequently, the electronic structures and chemical bonds in this compound were analyzed and discussed, and then the thermodynamic character of Li2MgN2H2 for hydrogen storage was evacuated. | WANG Qiang CHEN YunGui WU ChaoLing TAO MingDa GAI JingGang | 2009 | Chinese Science Bulletin2009，54，3： | 2 |
| 11 | Ethanol electrooxidation on Pd/C nanoparticles in alkaline media显示文摘Carbon-supported Pd nanoparticles were prepared by microwave heating-glycol reduction method, and characterized by a wide array of experimental techniques including X-ray diffraction spectroscopy(XRD) and transmission electron microscopy(TEM). The electrooxidation behaviors of ethanol on the Pd/C electrode in alkaline media were investigated using cyclic voltammetry(CV), chronoamperometry(CA), electrochemical impedance spectroscopy(EIS) and single cell performance methods. Pd/C electrode for ethanol oxidation showed high electro-catalytic activity and long term stability. However, it is observed that the current density decreases with the increasing of the potential and negative impedance presents in the potential from-0.1 to0.1 V. The decreasing current density and the negative impedance could be due to the adsorbed intermediates species that inhibited the further oxidation of ethanol. Based on the chemical reaction analysis and EIS spectra, equivalent circuits relating to various potential zones have been obtained. These results reveal the dynamic adsorption of intermediates species on Pd surfaces. Significantly, it is clarified that the adsorption behavior begins from the maximum catalysis of electro-catalysis and ends in the formation of the palladium(II) oxide layer on the electrode surface. | Fangfang Zhang Debi Zhou Mingda Zhou | 2016 | Journal of Energy Chemistry2016，25，1： | 2 |
| 12 | Efficient production of chemicals from microorganism by metabolic engineering and synthetic biology显示文摘The use of traditional chemical catalysis to produce chemicals has a series of drawbacks,such as high dependence on fossil resources,high energy consumption,and environmental pollution.With the development of synthetic biology and metabolic engineering,the use of renewable biomass raw materials for chemicals synthesis by constructing efficient microbial cell factories is a green way to replace traditional chemical catalysis and traditional microbial fermentation.This review mainly summarizes several types of bulk chemicals and high value-added chemicals using metabolic engineering and synthetic biology strategies to achieve efficient microbial production.In addition,this review also summarizes several strategies for effectively regulating microbial cell metabolism.These strategies can achieve the coupling balance of material and energy by regulating intracellular material metabolism or energy metabolism,and promote the efficient production of target chemicals by microorganisms. | Yang Zhang Jing Yu Yilu Wu Mingda Li Yuxuan Zhao Haowen Zhu Changjing Chen Meng Wang Biqiang Chen Tianwei Tan | 2021 | Chinese Journal of Chemical Engineering2021，34，2： | 2 |
| 13 | Assessment and Spatial Distribution of Zinc Pollution in Agricultural Soils of Chaoyang, China显示文摘 | Mingda Liu Yue Li Wei Zhang Yaojing Wang | 2013 | Procedia Environmental Sciences2013，，： | 2 |
| 14 | Topological Comparison and Analysis of Medium-voltage and High-power Direct-linked PV Inverter显示文摘Among all the renewable energy sources,the installed capacity of solar power generation is the fastest growing in recent years,so photovoltaic(PV)power generation still has great market potential.Compared with low-power systems,large-scale PV systems are more commercially attractive,because they can reduce the cost of the system per watt.The PV inverters with centralized and string structure have been applied in large-scale PV plant,but it is difficult to further increase the voltage and power levels for a single converter.In addition,the line-frequency isolation transformer requires a large amount of materials and has a large volume and weight.Therefore,it is a current trend for large-scale PV system to increase the voltage and power levels to directly connect to the medium-voltage power grid.Based on this,this paper investigates and compares several topologies of PV inverters without line-frequency transformer,including the MMC structure and the three-phase cascaded H-bridge(CHB)structure,which are able to directly connect to the 35kV medium-voltage power grid,and can not only make the voltage and power levels higher,but also further reduce the cost and volume of the whole system. | Xing Zhang Mingda Wang Tao Zhao Wang Mao Yuhua Hu Renxian Cao | 2019 | CES Transactions on Electrical Machines and Systems2019，3，4： | 2 |
| 15 | Magnetic and microstructural properties of sintered FeNdB-based magners with W,Mo and Nb additions 显示文摘 | Yan Aru Song Xiaoping Song Mingda | 1997 | J Alloys Comp1997，257，： | 1 |
| 16 | Configuration of nucleolar DNA in situ in nucleolus of Allium cepa cells显示文摘The location and configuration of nucleolar DNA have not been determined for a long time. In this paper, we have observed the nucleolar infrastructure and the character of nucleolar DNA in Allium cepa cells by conventional electron microscopy and the cytochemical NAMA-Ur DNA specific staining method. Furthermore, we have properly improved the NAMA-Ur method so as to analyze the location and configuration of nucleolar DNA in situ. Our results indicated that the nucleolar DNA in Allium cepa cells is mainly located at the border between fibrillar centers and dense fibribllar component, especially distributed in the configuration of encircling the fibrillar centers. | TAO Wei HE Jie JIAO Mingda HE Mengyuan HAO Shui | 2001 | Chinese Science Bulletin2001，46，1： | 1 |
| 17 | Application of photochemical reactions of Se in natural waters by hydride generation atomic fluorescence spectrometry显示文摘 | CHEN Yuwei ZHOU Mingda TONG Jian | 2005 | Analytica Chimica Acta2005，，545： | 1 |
| 18 | The structure and high-temperature (333K) electrochemical performance of La 0.8? x Ce x Mg 0.2 Ni 3.5 ( x =0.00–0.20) hydrogen storage alloys显示文摘 | Shen Xiangqian Chen Yungui Tao Mingda Wu Chaoling Deng Gang Kang Zhenzhen | 2009 | International Journal of Hydrogen Energy2009，，8： | 1 |
| 19 | Urea reactor integrity evaluation based on failure analysis显示文摘 | Song Mingda Wang Weiqiang Zhao Yafang | 2007 | Journal of Pressure Vessel Technology2007，129，4： | 1 |
| 20 | Active disturbance rejection control for fractional-order system显示文摘 | Li Mingda Li Donghai Wang Jing | 2013 | ISA Transactions2013，52，36： | 1 |
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