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Applying seepage modeling to improve sediment yield predictions in contour ridge systems

Journal of Arid Land 2020年第4期12卷 676-689页

作者： liu qianjin MA Liang ZHANG Hanyu Shandong Provincial Key Laboratory of Water and Soil Conservation&Environmental Protection College of Resources and EnvironmentLinyi UniversityLinyi 276000China Water Resources Research Institute of Shandong Province Ji'nan 250013China

Contour ridge systems may lead to seepage that could result in serious soil erosion. Modeling soil erosion under seepage conditions in a contour ridge system has been overlooked in most current soil erosion models. To address the importance of seepage in soil erosion modeling, a total of 23 treatments with 3 factors, row grade, field slope and ridge height, in 5 gradients were arranged in an orthogonal rotatable central composite design. The second-order polynomial regression model for predicting the sediment yield was improved by using the measured or predicted seepage discharge as an input factor, which increased the coefficient of determination(R^2) from 0.743 to 0.915 or 0.893. The improved regression models combined with the measured seepage discharge had a lower P(0.007) compared to those combined with the predicted seepage discharge(P=0.016). With the measured seepage discharge incorporated, some significant(P<0.050) effects and interactions of influential factors on sediment yield were detected, including the row grade and its interactions with the field slope, ridge height and seepage discharge, the quadratic terms of the field slope and its interactions with the row grade and seepage discharge. In the regression model with the predicted seepage discharge as an influencing factor, only the interaction between row grade and seepage discharge significantly affected the sediment yield. The regression model incorporated with predicted seepage discharge may be expressed simply and can be used effectively when measured seepage discharge data are not available.

关键词： soil erosion model contour ridge seepage geometry factors rainfall simulation

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Lateral abutment pressure distribution and evolution in wide pillars under the first mining effect

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International Journal of Mining Science and Technology 2023年第3期33卷 309-322页

作者： Zhen Zhang Zhen Li Gang Xu Xiaojin Gao qianjin liu Zhengjie Li Jiachen liu Coal Mining and Designing Branch China Coal Research InstituteBeijing 100013China CCTEG Coal Mining Research Institute Beijing 100013China Coal Mining&Designing Department Tiandi Science&Technology Co.Ltd.Beijing 100013China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Jiaozuo 454003China

The wide pillars are generally popular due to the high productivity and efficiency in Northwest *** distribution of lateral abutment pressure in coal pillars is important for mining *** reveal the effect of the first mining on the lateral abutment pressure distribution and evolution in wide pillars,an in-situ experiment,theoretical analysis and numerical simulation were ***,the field monitoring of lateral abutment pressure was conducted from the perspective of time and space in the Chahasu Coal Mine,Huangling No.2 Coal Mine and Lingdong Coal Mine during the first *** on the field monitoring stress,a theoretical model was proposed to reveal the lateral abutment pressure *** methodology was demonstrated through a case *** at the distribution mechanism,a numerical experiment was conducted through the finite-discrete element method(FDEM).Last,field observations of borehole fractures were performed to further study the damage *** addition,two types of lateral abutment pressure evolution with mining advance were *** on the stress monitoring layout were proposed as *** results could provide foundations for strata control and disaster prevention in wide pillars in underground coal mines.

关键词： Wide pillar Lateral abutment pressure Pillar stress First mining effect Field monitoring

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孟良崮小流域径流与磷素传输动态关系

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水土保持学报 2025年第1期39卷 46-55页

作者：杨彩玲胡砚霞于兴修姚佳吟郑若琳刘前进湖北大学资源环境学院区域开发与环境响应湖北省重点实验室临沂大学资源环境学院

[目的]为探讨不同降雨类型下径流-磷素流失滞后关系特征。[方法]以北方土石山区孟良崮小流域为研究对象，利用2010—2012年的32场降雨实测数据，通过C-Q(浓度-流量)环路和Pearson相关分析方法进行分析。[结果] 1)暴雨条件下，土壤饱和... 详细信息

[目的]为探讨不同降雨类型下径流-磷素流失滞后关系特征。[方法]以北方土石山区孟良崮小流域为研究对象，利用2010—2012年的32场降雨实测数据，通过C-Q(浓度-流量)环路和Pearson相关分析方法进行分析。[结果] 1)暴雨条件下，土壤饱和后释放大量磷素使磷素浓度峰值晚于径流峰值；大雨条件下，溶解性磷素从近源释放，颗粒态磷素从远源迁移到径流中；中雨条件下，DIP(溶解性无机磷)、PP(颗粒性磷)和TP(总磷)输移主要受地表径流影响，DP(溶解性总磷)输移受到土壤和沉积物影响；小雨条件下，表现出较快的溶解态磷素输移和较慢的颗粒态磷素输移。2)磷素输移的C-Q环路在径流过程中呈现多种类型，其中，PP和TP多为顺时针滞后，占18%～23%,主要受地表径流的强烈冲刷；逆时针滞后在各组分磷素中出现的比例相近，为12%～18%,源于土壤磷素缓慢释放和河道沉积物再悬浮；DP流失多表现为正“8”字形滞后，占比16%;DIP流失表现为逆“8”字形滞后，占比19%;线形滞后出现的频次较少；复杂形滞后的比例为31%～45%。3)暴雨和大雨条件下，DIP和DP与径流(Q)呈弱相关或负相关，源于强烈径流快速冲刷地表，而溶解性磷被土壤吸附未能同步释放或被径流稀释；中雨时，适中的径流冲刷力增强溶解性磷的释放；小雨时，径流主要迁移附着在松散土壤颗粒上的颗粒性磷。在不同降雨类型下，PP和TP始终高度相关，表明TP的主要来源是PP。[结论]孟良崮小流域需要针对不同的降雨情况防范磷素流失。

关键词：北方土石山区径流-磷素关系 C-Q环路 Pearson相关分析

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中国体育旅游研究30年进展与展望

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资源开发与市场 2025年第2期41卷 261-270页

作者：刘前进王磊杨红喜杨莹莹宁夏大学前沿交叉学院宁夏中卫755000

近年来,中国体育旅游发展势头强劲,学界涌现出大量相关研究成果,已经成为研究热点。体育旅游是体育产业创新发展的成果,也是体育学和旅游学等多学科交叉融合的新型领域。本研究借助可视化工具,从定量的角度梳理并分析体育旅游的研究进展... 详细信息

近年来,中国体育旅游发展势头强劲,学界涌现出大量相关研究成果,已经成为研究热点。体育旅游是体育产业创新发展的成果,也是体育学和旅游学等多学科交叉融合的新型领域。本研究借助可视化工具,从定量的角度梳理并分析体育旅游的研究进展,识别体育旅游研究的知识图谱,把握其研究动态与发展趋势,以期为今后研究提供新视角和新思路。研究以1992—2023年CNKI收录的1 595篇体育旅游领域CSSCI和北大核心论文为数据,采用CiteSpace软件对该领域的研究进展、研究热点和演进趋势进行可视化分析。研究发现体育旅游研究发展经历了3个阶段:探索萌芽阶段(1992—2000年)、发展壮大阶段(2001—2011年)和深入发展阶段(2012—2023年);研究热点为产业融合、旅游产业、“一带一路”、乡村振兴、高质量发展等;体育旅游呈现产业融合发展多元化、乡村体育旅游需求旺盛的特点;体育旅游政策、产业融合发展、乡村体育旅游、“数字化”+赋能体育旅游创新将是未来体育旅游研究的主要趋势。

关键词：体育旅游研究进展发展趋势知识图谱

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Atmospheric stable and fexible Sn-based perovskite solar cells via a bioinspired antioxidative crystal template

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Journal of Energy Chemistry 2022年第3期31卷 612-618,I0016页

作者： Rui Guo Li Rao qianjin liu Hongyu Wang Chenxiang Gong Baojin Fan Zhi Xing Xiangchuan Meng Xiaotian Hu School of Materials Science and Engineering Nanchang University999 Xuefu AvenueNanchang 330031JiangxiChina School of Future Technology Nanchang University999 Xuefu AvenueNanchang 330031JiangxiChina Institute of Polymers and Energy Chemistry Nanchang University999 Xuefu AvenueNanchang 330031JiangxiChina

Sn-based perovskite solar cells(PSCs)demonstrate a potential development in eco-friendly devices due to their ***,poor stability and crystalline quality are still the challenges for achieving high-performance and long-term operating *** this work,inspired by biological protein,nickelporphyrin(Ni-P)with electron cloud on conjugate ring is applied into Sn-based perovskite to prevent perovskite from being *** synergistic effect of water and oxygen is broken in grain boundaries and surface so that the stability of PSCs can be improved obviously,despite there is hardly any barrier for water to ***,the electron-rich molecules can passivate the defects of perovskite such as iodine ***,the ester group in Ni-P molecule can bind with SnI;to form complex and then restrain *** with the template effect of 2D molecular,the crystallization of perovskite films is ***,the Sn-based PSCs with Ni-P achieve a stabilized power conversion efficiency(PCE)of 7.79%with negligible hysteresis in fexible devices,***,the PSCs can maintain 80%of the pristine PCE after 300 h under air environment.

关键词： Lead-free Solar cell Flexible devices Molecular bionics Crystallization control

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Review of Modeling Methods of Distributed Energy Supply System Connected to the Grid

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Energy and Power Engineering 2013年第4期5卷 1317-1323页

作者： Shengxuan Wei qianjin liu School of Electric Power South China University of Technology Guangzhou China

At present, the development of distribution network can’t meet the requirements of rapid economic development. The traditional single energy supply is difficult to meet the request, and distributed energy supply has a lot of advantages compared to it, particularly it's close to the end users, and they have been developed well and applied widely in recent years. This paper summarizes the features and current development of the distributed energy supply, and mainly describes the grid-connection model of distributed energy supply. Base on the mathematic grid-connection model of distributed power sources with different generation principles as well as that energy storage, the treatment of these models in distribution network power flow analysis is also presented.

关键词： Modeling Distributed Energy Supply Grid-connection

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Overall Framework and Module of Distribution Network Coordinated Planning Considering Distributed Generation

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Engineering（科研） 2013年第1期5卷 32-36页

作者： qianjin liu Huanghuang liu School of Electric power South China University of Technology Guangzhou China

Combining with the characteristics of China's energy and the strategy of sustainable development, analyzing the pros and cons which caused by the appearance of DG and their operation connecting to grid, this paper points out that the two sides can achieve win-win under a reasonable combination between DG and distribution system, so as to optimize the allocation of resources, improve the utilization ratio of resource, and obtain maximum social benefit, harmoniously promote the development of power industry, economy and environment. As a word, this paper puts forward a new model of distribution network planning including DG and brings in penalty factorto guide the investment and construction of DG. Last of all, this paper presents the adoption of the coordination development coefficients which is to evaluate the power planning.

关键词： distributed generation distribution network planning penalty factor coordinated development coefficient

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Modeling Simulation Technology Research for Distribution Network Planning

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Energy and Power Engineering 2013年第4期5卷 980-985页

作者： Huanghuang liu Dan liu qianjin liu School of Electric Power South China University of Technology Guangzhou China

This paper proposes to use the power system simulation software CYME to plan, model and simulate for an actual distribution network for improving the reliability and efficiency, enhancing the efficiency and capacity, simulating the abnormal condition of distribution network, and presenting operation program of safe, reliable and having simulation record statements. The modeling simulation results show that the software module has lots of advantages including high accuracy, ideal reliability, powerful practicality in simulation and analysis of distribution network, it only need to create once model, the model can sufficiently satisfy multifarious types of simulation analysis required for the distribution network planning.

关键词： Distribution Network Planning Modeling Simulation Load Flow Calculation Reactive Power Optimization Load Balancing

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Discussion on Energy Internet and Its Key Technology

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Journal of Power and Energy Engineering 2017年第12期5卷 1-9页

作者： Zhenxiao Chen qianjin liu Yiqing Li Shiping liu School of Electric Power South China University of Technology Guangzhou China

Energy and environmental problems are among the important factors restricting economic development. The development of green energy is an important measure to deal with energy and environmental problems, such as wind energy and photovoltaic. Energy Internet is an important mean to promote the transformation of the energy structure, improve energy efficiency and reduce pollution. In introduction, the energy Internet is put forward. Then the architecture and characteristics of energy Internet, such as integration, openness, intelligence and marketization of energy Internet are analyzed. Next, key technologies such as energy router, virtual power plant and network security technology are discussed. Finally, a few suggestions for the development of energy Internet are proposed, and hoped to promote the development of energy Internet.

关键词： Energy Internet Source-Network-Charge Information Flow Energy Router Virtual Power Plant

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Decreased peripheral mtDNA in methamphetamine use disorder

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Science China(Life Sciences) 2022年第3期65卷 648-650页

作者： Ling-Yan Su Yuan Li qianjin liu Lijin Jiao Jing Shen Lu-Xiu Yang Ti-Fei Yuan Yong-Gang Yao Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences&Yunnan Province and KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common DiseasesKunming Institute of ZoologyKunming 650204China Kunming College of Life Science University of Chinese Academy of SciencesKunming 650204China Shanghai Key Laboratory of Psychotic Disorders Shanghai Mental Health CenterShanghai Jiaotong University School of MedicineShanghai 200030China Hubei Shizishan Drug Rehabilitation Center Wuhan 426070China Co-innovation Center of Neuroregeneration Nantong UniversityNantong 226019China Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People’s Hospital Affiliated to Tongji University School of MedicineShanghai 200434China CAS Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of SciencesShanghai 200031China

Dear Editor,Methamphetamine(METH)is the most prevalent addictive psychostimulant in *** use disorder(MUD)and its associated disorders constitute a significant burden to the affected individuals and their families(Paulus and Stewart,2020).Neurotransmitter system aberrations,mitochondrial dysfunction,oxidative stress,and inflammasome activation have been involved in METH-induced neurotoxicity(Shin et al.,2018;Wang et al.,2015;Wei et al.,2020).

关键词： China Stewart

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