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Infiltration,runoff,and slope stability behaviors of infinite slope with macropores based on an improved Green–Ampt model

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Journal of Mountain Science 2024年第7期21卷 2220-2235页

作者： LI Shanghui wu Guoxiong QUE Yun JIANG zhenliang CHENG Gaoyun College of Intelligent Construction Fuzhou University of International Studies and TradeFuzhou 350202China College of Civil Engineering Chongqing Jiao Tong UniversityChongqing 400074China Chongqing Vocational College of Architectural Engineering Chongqing 400072China College of Civil Engineering Fuzhou UniversityFuzhou 350000China Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyHong Kong 999077China T.Y.Lin International Engineering Consulting(China)Co.Ltd Chongqing 401120China

Infiltration–runoff–slope instability mechanism of macropore slope under heavy rainfall is *** paper studied its instability mechanism with an improved Green–Ampt(GA)model considering the dual-porosity(i.e.,matrix and macropore)and ponding condition,and proposed the infiltration equations,infiltration–runoff coupled model,and safety factor calculation *** show that the infiltration processes of macropore slope can be divided into three stages,and the proposed model is rational by a comparative *** wetting front depth of the traditional unsaturated slope is 17.2%larger than that of the macropore slope in the early rainfall stage and 27%smaller than that of the macropore slope in the late rainfall ***,macropores benefit the slope stability in the early rainfall but not in the *** flow does not occur initially but becomes pronounced with increasing rainfall *** equal depth of the wetting front in the two domains is regarded as the onset criteria of macropore *** analysis shows that macropore flow is delayed by increasing proportion of macropore domain(ω_(f)),whereas promoted by increasing ratio of saturated permeability coefficients between the two domains(μ).The increasing trend of ponding depth is sharp at first and then grows ***,when rainfall duration is less than 3 h,ωf andμhave no significant effect on the safety factor,whereas it decreases with increasingωf and increases with increasingμunder longer duration(≥3 h).With the increase ofω_(f),the slope maximum instability time advances by 10.5 h,and with the increase ofμ,the slope maximum instability time delays by 3.1 h.

关键词： Macropore slope Green–Ampt infiltration model Equivalent wetting front Ponding response time Slope stability

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New Framework for Evaluating Ecosystem Quality in Nature Reserves based on Ideal References and Key Indicators

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Journal of Resources and Ecology 2022年第3期13卷 466-475页

作者： wu zhenliang HOU Jihua XU Li HE Nianpeng School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Vegetation Ecology of Ministry of Education Northeast Normal UniversityChangchun 130024China

With increasing numbers and types of nature reserves(NRs),objective evaluation and comparison of the effects of different nature NRs on conservation efforts are of great importance for protecting species diversity,ensuring reasonable national economic input,and adjusting government management *** a method for the combined assessment of flagship or umbrella species and ecosystem quality will improve the evaluation of ***,it is also important to establish a new framework for rapid evaluation of ecosystem quality,supported by the advantages of scientific,economic,and regular ***,we proposed a new framework that incorporates the novel concept of ideal references into evaluation systems,which will facilitate the comparison of results from different periods and ***,from the perspective of making the framework as objective,rapid,and economical as possible,we recommended some key ecological indicators,such as net primary productivity,soil organic matter,plant diversity,for use in the new evaluation *** new framework,referred to as“ideal reference and key indicators”(IRKI),can sufficiently meet the requirements for the rapid evaluation of ecosystem quality both regionally and ***,IRKI can identify the restoration potential and restoration periods of NRs,thus facilitating the rational distribution of resources and enhancing the protective *** are many types of NRs in China,and it is necessary to partially alter the assessment methods or parameters for different types of ***,IRKI provides a simple,clear,and comparable framework that will strongly enhance the conservation of protected areas(PAs)and facilitate the standardization of management practices.

关键词： nature reserve ecosystem quality ideal reference key indicators conservation management

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弱胶结地层富水巷道围岩变形规律研究

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煤炭技术 2024年第6期43卷 43-47页

作者：朱铖宇刘洪林陈志文罗文杰朱俊杰邹长锋吴振良新疆大学地质与矿业工程学院乌鲁木齐830017 新疆大学矿产资源生态环境保护性开采自治区高校重点实验室乌鲁木齐830017

新疆煤系地层以弱胶结地层为主,弱胶结岩石普遍具有胶结松散、力学强度低和水软化作用明显的特点,弱胶结地层给煤炭资源开采带来极大困难。结合新疆弱胶结地层地质条件,采用相似模拟实验方法,分析了膨胀应力在此类巷道围岩变形过程中的... 详细信息

新疆煤系地层以弱胶结地层为主,弱胶结岩石普遍具有胶结松散、力学强度低和水软化作用明显的特点,弱胶结地层给煤炭资源开采带来极大困难。结合新疆弱胶结地层地质条件,采用相似模拟实验方法,分析了膨胀应力在此类巷道围岩变形过程中的影响,研究了弱胶结地层富水巷道围岩变形规律,为西部矿区类似工程地质条件下巷道变形规律研究与工程支护设计提供有益的参考。

关键词：弱胶结地层富水巷道围岩膨胀应力相似模拟实验

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一种新的植物生长抑制剂生物活性鉴定法

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南开大学学报（自然科学版） 2000年第1期33卷 29-33页

作者：武振亮杨秀凤南开大学元素有机化学研究所天津300071

报告一种新的植物生长抑制剂生物活性鉴定法—油菜 ( Brassica campestris L)下胚轴试法 .该试法以浸渍法处理吸涨 2 h的油菜种子 ,2 6℃黑暗保温 53 h后测定结果 .以 1 0 μg/m L的检测浓度可将 1 0种已知抑制剂的活性准确区分开来 .检... 详细信息

报告一种新的植物生长抑制剂生物活性鉴定法—油菜 ( Brassica campestris L)下胚轴试法 .该试法以浸渍法处理吸涨 2 h的油菜种子 ,2 6℃黑暗保温 53 h后测定结果 .以 1 0 μg/m L的检测浓度可将 1 0种已知抑制剂的活性准确区分开来 .检测 ABA、S0 7和 S0 8的线性浓度范围均为 0 .0 0 1～ 1 μg/m L,PP3 3 3为 0 .0 1～ 1 μg/m L.它与某些经典试法的反应灵敏度相当或更高。

关键词：植物生长抑制剂油菜下胚轴试法生物活性鉴定法

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Effects of DPC on Agronomic Traits and Economic Characters of Machine-Harvested Cotton in the Yellow River Valley of China and Chemical Control Techniques

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Agricultural Science & Technology 2017年第10期18卷 1887-1891页

作者： Liying LIU Maohua DAI zhenliang wu Dryland Farming Research Institute Hebei Academy of Agriculture and Forestry Sciences Key Laboratory for Crop Drought Resistant Research of Hebei Province Hengshui 053000 China

[Objective] The aim was to investigate the effects of DPC chemical controlling technique on agronomic traits, yield and quality of machine-harvested cotton in the Yellow River Valley of China, and clarify the reasonable control period and the application amount of DPC. [Method] The new machine-harvested cotton variety Hengmian HD008 was used as the test material, and 3 different DPC treatments were set. [Result] DPC significantly reduced plant height and branch length, reduced branch angle and leaf area, so the rational control can effectively shape the ideal plant type of machine-harvested cotton. DPC had significant effects on yield and yield components, and the proper amount of DPC could increase the number of bolls during hot days, the number bolls in autumn and the total number of bolls. It increased the boll weight and seed index, but decreased lint percentage decreased, and proper amount of DPC could increase the yield. DPC significantly increased the specific breaking strength of fibers, and proper control could improve the uniformity of fibers, but other indexes had no significant influence. [Conclusion] According to the requirements of machine harvest to the agronomic traits of cotton and the growth characteristics of cotton plant, chemical control could begin after floral bud emergence in cotton about every 10 d, and the spraying amount can be controlled according to the growth amount of the main stem. The daily growth amount of plant height should be controlled at 1.5-1.8 cm, and the plant height should be within 75-90 cm.

关键词： Machine-harvested cotton Agronomic characters Yield Fiber quality Chemical controlling technique

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Breeding of Good-quality High-yield Salt-tolerant and Drought-resistant Hybrid Cotton Variety Hengyou 12

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Agricultural Science & Technology 2017年第10期18卷 1878-1881页

作者： Maohua DAI Liying LIU zhenliang wu Dryland Farming Institute Hebei Academy of Agricultural and Forestry SciencesHebei Key Laboratory of Crops Drought Resistance Hengshui 053000 China

Salt and drought tolerance, high yield and quality, disease and pest resistance of cotton varieties are new requirements for the current situation in cotton production. Hengyou 12 is a transgenic Bt cotton variety bred by hybridizing JD 28 （interspeciflc progeny of upland cotton, sea-island cotton, wild cotton species） as female parent with GK55 （transgenic Bt cotton variety） as male parent. The combining of parents was based on the complementary principle of parental traits. Hengyou 12 with strong heterosis was selected under disease stress, pest stress, salt stress and drought stress. This variety has many excellent characteristics, such as good resis- tance to diseases and pests, high yield, excellent quality, strong drought resistance and salt tolerance. ＇Hengyou12＇ was approved by Hebei Province in 2015, and is suitable for planting in middle and south areas of Hebei and similar ecological areas in the Yellow River basin.

关键词： Upland cotton 'Hengyou 12' Insect resistant hybrid Vadety breeding

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Brief Introduction to the "Catalogue of Recent Chinese Earthquakes (1912～1990, M_S≥4.7)

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Earthquake Research in China 1999年第1期13卷 9-13页

作者： Wang Suyun, wu Ge, Shi zhenliang, Li Qun, Zhai Wenjie, Gao Ajia, wu Huanying, Guo Ying, and Zhang XiaodongInstitute of Geophysics, CSB, Beijing 100081, ChinaSeismological Bureau of Liaoning Province, Shenyang 110031, China

This paper briefly introduces the principles and methods for compiling the "Catalog of Recent Chinese Earthquakes (1912 ～ 1990, MS≥4.7)." This new catalog is compiled by revising and supplementing the 1983 version o... 详细信息

关键词： Catalog of Chinese earthquakes (CCE) 1912-1990.

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Ballistic performances of the hourglass lattice sandwich structures under high-velocity fragments

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Defence Technology（防务技术） 2024年第1期31卷 312-325页

作者： He-xiang wu Jia Qu Lin-zhi wu Key Laboratory of Advanced Ship Materials and Mechanics College of Aerospace and Civil EngineeringHarbin Engineering UniversityHarbin150001China School of Civil Engineering Northeast Forestry UniversityHarbin150040China

In this paper,the numerical simulation method is used to study the ballistic performances of hourglass lattice sandwich structures with the same mass under the vertical incidence of *** is paid to elucidating the influences of rod cross-section dimensions,structure height,structure layer,and rod inclination angle on the deformation mode,ballistic performances,and ability to change the ballistic direction of *** results show that the ballistic performances of hourglass lattice sandwich structures are mainly affected by their structural *** this respect,structural parameters optimization of the hourglass lattice sandwich structures enable one to effectively improve their ballistic limit velocity and,consequently,ballistic performances.

关键词： Hourglass lattice sandwich structures Ballistic performances high-velocity Finite element analysis

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Resilience-incorporated seismic risk assessment of precast concrete frames with“dry”connections

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 403-425页

作者： wu Chenhao Tang Yuchuan Cao Xuyang wu Gang Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education Nanjing 211102China Department of Civil and Environmental Engineering University of CaliforniaLos AngelesCA 90095USA School of Civil Engineering Southeast UniversityNanjing 211102China College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China

A resilience-incorporated risk assessment framework is proposed and demonstrated in this study to manifest the advantageous seismic resilience of precast concrete frame(PCF)structures with“dry”connections in terms of their low damage and rapid *** framework integrates various uncertainties in the seismic hazard,fragility,capacity,demand,loss functions,and post-earthquake *** this study,the PCF structures are distinguished from ordinary reinforced concrete frame(RCF)structures by characterizing multiple limit states for the PCF based on its unique damage ***,probabilistic story-wise pushover analyses are performed to yield story-wise capacities for the predefined limit *** the seismic resilience analysis,a step-wise recovery model is proposed to idealize the functionality recovery process,with separate considerations of the repair and non-repair *** recovery model leverages the economic loss and downtime to delineate the stochastic post-earthquake recovery curves for the resilience loss *** such,contingencies in the probabilistic post-earthquake repairs are incorporated and the empirical judgments on the recovery parameters are largely *** proposed framework is demonstrated through a comparative study between two“dry”connected PCFs and one RCF designed as alternative structural systems for a prototype *** results from the risk quantification indicate that the PCFs show reduced loss hazards and lower expected losses relative to the ***,the PCF equipped with energy dissipation devices at the“dry”connections largely reduces the expected economic loss,downtime,and resilience loss by 29%,56%,and 60%,respectively,compared to the RCF.

关键词： precast concrete frame non-emulative precast system seismic resilience seismic risk functional recovery

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New findings on the influence of El Nino events on tropical cyclone formation

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Science China Earth Sciences 2024年第3期67卷 892-893页

作者： Liguang wu Department of Atmospheric and Oceanic Sciences Institute of Atmospheric SciencesFudan UniversityShanghai 200438China

Tropical cyclones typically form over warm tropical and subtropical ocean surfaces, as their formation and intensification rely primarily on the energy provided by the ocean. Pioneering research by Gray (1968) revealed that the formation of tropical cyclones requires the sea surface temperature (SST) to be no less than 26.5℃. Consequently, SST is commonly recognized as a crucial parameter among the environmental factors influencing tropical cyclone formation(Gray, 1979;Emanuel and Nolan, 2004).

关键词： tropical cyclone ocean

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