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Assessing sediment connectivity and its spatial response on land use using two flow direction algorithms in the catchment on the Chinese Loess Plateau

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Journal of Mountain Science 2022年第4期19卷 1119-1138页

作者： YAN Xi-qin JIAO Ju-ying TANg Bing-zhe LIANg yue WANg Zhi-jie State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China Institute of Soil and Water Conservation Northwest A&F UniversityYangling 712100China University of Chinese Academy of Sciences Beijing 100049China College of Life Sciences Guizhou UniversityGuiyang 550025China

Severe soil and water loss have led to widespread land degradation on the Loess Plateau in *** the relationship between land use and sediment connectivity can be beneficial to control soil *** this study,three catchments in the Yanhe River Basin on the Loess Plateau were selected to analyse the relationship between land use and sediment connectivity using grey correlation *** of connectivity(IC)was employed to quantify sediment connectivity,including two flow direction algorithms(D8 and D-infinity)and two final targets of sediment transport(outlet and main channel of catchment).Then,11 landscape metrics were used to evaluate the land use spatial patterns of *** comparing the IC value ranges,histograms and classes,and their relationship with remote sensing images of the two flow direction algorithms,we find that the D8 algorithm is more suitable for this study *** results showed that the three catchments are characterized by high sediment connectivity in the grassland and forest close to the *** addition,the roads and bare land close to the channel also have high or medium sediment *** correlation analysis showed that landscape division index(DIVISION),fractal dimension index(FRACMN),aggregation index(AI),total class area,patch cohesion index(COHESION),and largest patch index(LPI)indices were the main factors that affect sediment connectivity at the class *** the landscape scale,the landscape shape index(LSI),Shannon’s diversity index(SHDI),and gully density have an essential effect on sediment *** condition provides a way to control the sediment connectivity in the watershed by transforming land use type or changing its spatial pattern,but specific adjustment measures have to be further explored.

关键词： Sediment connectivity Land use Landscape metrics Catchments Loess Plateau

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Do community responses influence OSS contributor retention? A survival analysis

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Science China(Information Sciences) 2024年第8期67卷 331-333页

作者： zhe WANg Zhixing LI yue YU School of Public Policy and Management Tsinghua University College of Computer National University of Defense Technology

Open source software(OSS) projects usually employ a community-based model, where geographically distributed developers from around the world collaborate online [1].With the rise of social coding sites like git Hub, contributing to OSS projects has become easier and more accessible, motivating many developers to join the OSS community [2]. The continued submission of high-quality contributions from these community developers has led to numerous corrections, improvements, and innovations in many successful OSS projects [1, 2].

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Hilbert genus Fields of Imaginary Biquadratic Fields

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Communications in Mathematics and Statistics 2017年第2期5卷 175-197页

作者： zhe Zhang Qin yue School of Mathematics and Statistics Xidian UniversityXi’an 710126People’s Republic of China Department of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing210016People’s Republic of China

Let K_(0)=Q(√δ)*** K_(0) withoddclassnumber,much work has been done on the explicit construction of the Hilbert genus field of a biquadratic extension K=Q(√δ,√d)over ***δ=2 or p with p≡1 mod 4 a prime and K is real,it was described in yue(Ramanujan J 21:17–25,2010)and Bae and yue(Ramanujan J 24:161–181,2011).In this paper,we describe the Hilbert genus field of K explicitly when K_(0) is real and K is *** fact,we give the explicit construction of the Hilbert genus field of any imaginary biquadratic field which contains a real quadratic subfield of odd class number.

关键词： Class group Hilbert symbol Hilbert genus fields

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Changes in Public Perception and Behaviors under Compound Heatwave in COVID-19 Epidemic——Beijing,China,2020

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China CDC weekly 2021年第32期3卷 675-680,I0001,I0002页

作者： jie Ban yue Sun Yi Zhang Mike zhe Qinghua Sun Chen Chen Tiantian Li China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijingChina Department of Environmental Medicine and Public Health Icahn School of Medicine at SinaiNew York CityNYUSA

Summary What is already known about this topic?Dramatic heatwaves frequently occurred simultaneously with the coronavirus disease 2019(COVID-19)pandemic worldwide in 2020 and posed public health *** risk perceptions a... 详细信息

关键词： Public COV wave

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Radially loading rotary extrusion for manufacturing large-size conical cylinders with inner transverse high ribs

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Chinese Journal of Aeronautics 2023年第5期36卷 582-594页

作者： zhe CHEN Zhimin ZHANg jie zheNg Yong XUE School of Material Science and Engineering North University of ChinaTaiyuan 030051China

The Large-size Conical Cylinders with Inner Transverse High Ribs(LCCWITHR) can reduce the weight of the parts while maintaining high rigidity and strength. Radially Loading Rotary Extrusion(RLRE) forming technology can achieve integral forming of LCCWITHR through the synergy of radial and rotary movements of dies. The flow law of the material during the forming process is the key to forming large-size inner ribs. At present, there is no unified understanding of the metal flow law of RLRE forming technology. An analytical expression was derived to predict the Radial Direction(RD) deformation loads. The FE simulation and process experiment were carried out to investigate the effects of the inclination angle, thickness factor and transition arc radius of the split top dies on the spacing of the metal diversion plane, the metal flow velocity of the rib area and the final radius of the inner rib. The influence of the split top dies loading distance and the bottom die rotation angle of each pass on the inner radius of the inner rib was verified. And the optimal combination of dies shape parameters and loading paths which can make the metal flow orderly was obtained: the inclination angle is 140°, the thickness factor is 3.64, the transition arc radius is 16 mm;the top dies loading distance is 15 mm, the bottom die rotation angle is 45°.The FE simulation results have been found to be in close agreement with physics *** research results reveal the metal flow law of rib growth in the RLRE of LCCWITHR, which lays a theoretical foundation for subsequent thorough research and process optimization.

关键词： Extrusion molding Rotary extrusion Radially loading Inner transverse rib Metal flow law Conical cylinder

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Cylindrical KP-Burgers Equation for Two-Temperature Ions in Dusty Plasma with Dissipative Effects and Transverse Perturbations

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Communications in Theoretical Physics 2006年第2X期46卷 313-318页

作者： WANg yue-yue ZHANg jie-Fang Institute of Nonlinear Physics Zhejiang Normal University Jinhua 321004 China

In this paper, the cylindrical KP-Burgers equation with variable coefficient for two-temperature ions in unrsagnified dusty plasma with dissipative effects and transverse perturbations in cylindrical geometry is derived by using the standard reductive perturbation technique. With the help of variable-coeiffcient generalized projected Ricatti equation expansion method, the cylindrical KP-Burgers equation is solved and shock wave solution is obtained. The effecta of some important parameters to the shock wave solution are illustrated from the wave evolution figures. The effects caused by dissipation and transverse perturbations are also discussed.

关键词： dusty plasma KP-Burgers equation shock wave

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Adsorption and Decarbonylation Reaction of Furfural on the Pd(111) and M/Pd(111)(M=Ni, Cu and Ru) Surfaces

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Chinese Journal of Structural Chemistry 2019年第2期38卷 211-223,166页

作者： XIA Sheng-jie FANg Lei QIAN Meng-Dan MENg yue NI zhe-Ming Laboratory of Advanced Catalytic Materials College of Chemical Engineering Zhejiang University of Technology School of Life Sciences Huzhou University

By performing with density functional theory(DFT) method, the detailed adsorption process and the catalytic decarbonylation mechanisms of furfural over Pd(111) and M/Pd(111)(M = Ni, Cu, Ru) surfaces toward furan were clarified. The results of atomic size factor, formation energy and d-band center showed that Ru/Pd(111) surface was the most stable and active. The adsorption energies of furfural on the different surfaces followed the order Ru/Pd(111) > Cu/Pd(111) > Pd(111) > Ni/Pd(111). After analyzing Mulliken atomic charge population and the deformation density, we can find that on Ru/Pd(111) surface, the number of charge transfer was the most and the interaction was the strongest. Therefore, its adsorption energy was the highest. Furthermore, the furfural decarbonylation pathway is more kinetically feasible on bimetallic surface, and the reaction is the most likely to occur on Ru/Pd(111).

关键词： density functional theory furfural Pd(111) bimetallic catalyst adsorption decarbonylation mechanism

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Evaluation of 30 DNA damage response and 6 mismatch repair gene mutations as biomarkers for immunotherapy outcomes across multiple solid tumor types

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Cancer Biology & Medicine 2021年第4期18卷 1080-1091页

作者： zhe gong yue Yang jieyun Zhang Weijian guo Department of Medical Oncology Fudan University Shanghai Cancer CenterShanghai 200032China Department of Oncology Shanghai Medical CollegeFudan UniversityShanghai 200032China

Objective:DNA damage response(DDR)genes have low mutation rates,which may restrict their clinical applications in predicting the outcomes of immune checkpoint inhibitor(ICI)***,a systemic analysis of multiple DDR genes is needed to identify potential biomarkers of ICI ***:A total of 39,631 patients with mutation data were selected from the cBioPortal database.A total of 155 patients with mutation data were obtained from the Fudan University Shanghai Cancer Center(FUSCC).A total of 1,660 patients from the MSK-IMPACT cohort who underwent ICI treatment were selected for survival analysis.A total of 249 patients who underwent ICI treatment from the Dana-Farber Cancer Institute(DFCI)cohort were obtained from a published *** Cancer genome Atlas(TCgA)level 3 RNA-Seq version 2 RSEM data for gastric cancer were downloaded from ***:Six MMR and 30 DDR genes were included in this *** MMR and 20 DDR gene mutations were found to predict the therapeutic efficacy of ICI,and most of them predicted the therapeutic efficacy of ICI,in a manner dependent on TMB,except for 4 combined DDR gene mutations,which were associated with the therapeutic efficacy of ICI independently of the *** MMR/DDR genes showed low mutation rates;however,the mutation rate of all the MMR/DDR genes associated with the therapeutic efficacy of ICI was relatively high,reaching 10%–30%in several cancer ***:Coanalysis of multiple MMR/DDR mutations aids in selecting patients who are potential candidates for immunotherapy.

关键词： Immune checkpoint inhibitor therapy prediction of efficacy tumor mutation burden mismatch repair deficiency DNA damage response genes

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Scheme of optimal fault detection for linear discrete time-varying systems with delayed state

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Journal of Systems Engineering and Electronics 2017年第5期28卷 979-985页

作者： Maiying Zhong jie Chen yue geng School of Instrumentation Science and Opto-electronics Engineering Beihang University College of Electrical Engineering and Automation Shandong University of Science and Technology

This paper deals with the problem of the optimal fault detection (FD) for linear discrete time-varying (LDTV) systems with delayed state and l(2)-norm bounded unknown input. The novelty lies in the designing of an evaluation function for the robust FD. The basic idea is to directly construct an evaluation function by using a weighted l(2)-norm of the measurement output, which achieves an optimal trade-off between the sensitivity to fault and the robustness to l(2)-norm bounded unknown input. To avoid complex computation, a feasible solution is obtained via the recursive computation by applying the orthogonal projection. It is shown that such an evaluation function provides a unified scheme for both the cases of unknown input being l(2)-norm bounded and jointly normal distribution, while a threshold may be chosen based on a priori knowledge of unknown input. A numerical example is given to demonstrate the effectiveness of the proposed method.

关键词： fault detection evaluation function linear discrete time-varying system time-delay

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CLUSTER-BASED REgULARIZED SLICED INVERSE REgRESSION FOR FORECASTINg MACROECONOMIC VARIABLES

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Journal of Systems Science & Complexity 2014年第1期27卷 75-91页

作者： YU yue CHEN Zhihong YANg jie TradeLink L.L.CS. Wacker Drive Suite 1900 Chicago Illinois USA. School of International Trade and: Economics University of International Business and Economics BeijingChina. Department of Mathematics Statistics and Computer Science University of Illinois at Chicago Chicago Illinois USA.

This paper concerns the dimension reduction in regression for large data set. The authors introduce a new method based on the sliced inverse regression approach, cMled cluster-based regularized sliced inverse regression. The proposed method not only keeps the merit of considering both response and predictors＇ information, but also enhances the capability of handling highly correlated variables. It is justified under certain linearity conditions. An empirical application on a macroeconomic data set shows that the proposed method has outperformed the dynamic factor model and other shrinkage methods.

关键词： Cluster-based forecast macroeconomics sliced inverse regression.

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