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Influence of the roots of mixed-planting species on the shear strength of saline loess soil

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Journal of Mountain Science 2021年第3期18卷 806-818页

作者： liu ya-bin HU Xia-song YU Dong-mei ZHU Hai-li LI Guo-rong Department of Geological Engineering Qinghai UniversityXining 810016China Qinghai Institute of Salt Lakes Chinese Academy of ScienceXining 810008China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Provincial Key Laboratory of Geology and Environment of Salt LakesXining 810008China

In order to improve our knowledge of the mechanical effect of the roots of mixed-plantings on soil reinforcement and slope protection,the influence of roots of a mixed-planting with four herb species(Medicago sativa L.,Elymus nutans Griseb.,Puccinellia distanx(L.),and Poa pratensis L.)and one shrub species(Caragana korshinskii Kom.)were investigated on the shear strength characteristics of saline loess *** root distribution characteristics were assessed via a survey when the plants grew for one *** effects of the root biomass density,the root mass ratio(RMR)of the fine roots to the coarse roots,the moisture content,and the salt content on the shear strength index of the rooted soil were analyzed via a triaxial compression test,and the mechanism of these effects was *** results indicate that the biomass density decreased linearly with increasing *** RMR initially decreased with depth and then increased,exhibiting in a quadratic *** cohesion of the rooted soil increased linearly as the biomass density *** cohesion of the rooted soil initially increased with increasing RMR and salt content,and then it *** turning point of the cohesion occurred when the RMR was 0.6 and the salt content was 1.18%.The internal friction angle of the rooted soil initially increased with biomass density and then decreased,and the turning point of the internal friction angle occurred when the biomass density was 0.015 g/*** relationships between the internal friction angle of the rooted soil and the RMR and salt content were exponential incremental and linear subtractive relationship,*** the cohesion and the internal friction angle of the rooted soil linearly decreased with increasing moisture content.

关键词： Xining Basin Herb species Shrub species Rooted soil Saline loess soil Soil reinforcement Shear strength index

Variable hydrological effects of herbs and shrubs in the arid northeastern Qinghai-Tibet Plateau,China

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Journal of Mountain Science 2018年第7期15卷 1532-1545页

作者： liu ya-bin ZHANG Ying FU Jiang-tao YU Dong-mei HU Xia-song LI Xi-lai QI Zhao-xin LI Shu-xia Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of SaltLakes Chinese Academy of Sciences Xining 810008 China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008 China University of Chinese Academy of Sciences Beijing 100049 China Department of Geological Engineering Qinghai University Xining 810016 China College of Agriculture and Animal Husbandry Qinghai University Xining 810016 China

This study aims to assess the hydrological effects of four herbs and four shrubs planted in a selfestablished test area in Xining Basin of northeastern Qinghai-Tibet Plateau, China. The RainfallIntercepting Capability(RIC) of the herbs and shrubs was evaluated in rainfall interception experiment at the end of the third, fourth and fifth month of the growth period in 2007. The leaf transpiration rate and the effects of roots on promoting soil moisture evaporation in these plants were also assessed in transpiration experiment and root-soil composite system evaporation experiment in the five month's growth period. It is found that the RIC of the fourstudied herbs follows the order of E. repens, E. dahuricus, A. trachycaulum and L. secalinus; the RIC of the four shrubs follows the order of A. canescens, Z. xanthoxylon, C. korshinskii and N. tangutorum. The RIC of all the herbs is related linearly to their mean height and canopy area(R^2 ≥ 0.9160). The RIC of all the shrubs bears a logarithmic relationship with their mean height(R^2 ≥ 0.9164), but a linear one with their canopy area(R^2 ≥ 0.9356). Moreover, different species show different transpiration rates. Of the four herbs, E. repens has the highest transpiration rate of 1.07 mg/(m^2·s), and of the four shrubs, A. canescens has the highest transpiration rate(0.74 mg/(m^2·s)). The roots of all the herbs and shrubs can promote soil moisture evaporation. Of the four herbs, the evaporation rate of E. repens root-soil composite system is the highest(2.14%), and of the four shrubs,the root-soil composite system of A. canescens has the highest evaporation rate(1.41%). The evaporation rate of the root-soil composite system of E. dahuricus and Z. xanthoxylon bears a second-power linear relationship with evaporation time(R^2 ≥ 0.9924). The moisture content of all the eight root-soil composite systems decreases exponentially with evaporation time(R^2 ≥ 0.8434). The evaporation rate and moisture content of all the plants' root-

关键词： Plant hydrological effects Rainfall interception capacity Root-soft composite system Transpiration rate Moisture evaporation rate Qinghai-Tibet Plateau

Influences of soil moisture and salt content on loess shear strength in the Xining Basin, northeastern Qinghai-Tibet Plateau

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Journal of Mountain Science 2019年第5期16卷 1184-1197页

作者： FU Jiang-tao HU Xia-song LI Xi-lai YU Dong-mei liu ya-bin yaNG You-Qing QI Zhao-xin LI Shu-xia Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes University of Chinese Academy of Sciences Department of Geological Engineering Qinghai University College of Agriculture and Animal Husbandry Qinghai University

Moisture and salt content of soil are the two predominant factors influencing its shear strength. This study aims to investigate the effects of these two factors on shear strength behavior of loess in the Xining Basin of Northeast Qinghai-Tibet Plateau, where such geological hazards as soil erosion, landslides collapse and debris flows are widespread due to the highly erodible loess. Salinized loess soil collected from the test site was desalinized through salt-leaching in the laboratory. The desalinized and oven-dried loess samples were also artificially moisturized and salinized in order to examine how soil salinity affects its shear strength at different moisture levels. Soil samples prepared in different ways(moisturizing, salt-leaching, and salinized) were measured to determine soil cohesion and internal friction angle. The results show that salt-leaching up to 18 rounds almost completely removed the salt content and considerably changed the physical components of loess, but the soil type remained unchanged. As salt content increases from 0.00% to 12.00%, both the cohesion and internal friction angle exhibit an initial decrease and then increase with salt content. As moisture content is 12.00%, the salt content threshold value for both cohesion and internal friction angle is identified as 3.00%. As the moisture content rises to 16.0% and 20.00%, the salt content threshold value for cohesion is still 6.00%, but 3.00% for internal friction angle. At these thresholds soil shear strength is the lowest, below which it is inversely related to soil salinity. Beyond the thresholds, however, the relationship is positive. Dissimilar to salinity, soil moisture content exerts an adverse effect on shear strength of loess. The findings of this study can provide a valuable guidance on stabilizing the engineering properties of salinized loess to prevent slope failures during heavy rainfall events.

关键词： Salinized loess Desalinized loess Salt-leaching Shear strength indices Moisture content Salt content

Clinical effects of applying a tourniquet in total knee arthroplasty on blood loss

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Chinese Medical Journal 2010年第21期123卷 3030-3033页

作者： ZHANG Fu-jiang XIAO Yu liu ya-bin TIAN Xu GAO Zhi-guo Department of Orthopaedics Tianjin Hospital Tianjin 300211China

Background Tourniquets used during total knee arthroplasty may lead to many complications. The aim of this study was to determine perioperative blood loss and its clinical relevance in total knee replacement surgery after applying a *** From June 2009 to October 2009, 60 consecutive patients who underwent routine total knee arthroplasty were randomly divided into two groups and were treated with or without a tourniquet （30 patients/group）. There were no significant differences in patient baseline characteristics between the two groups. We compared the two groups of patients in terms of intra- and postoperative bleeding, invisible or visible bleeding, and total blood *** None of the patients showed poor wound healing, lower extremity deep venous thrombosis or other complications. The amount of blood loss during surgery was lower in the tourniquet group than in the control group （P〈0.01）. However, postoperative visible bleeding （P 〈0.05） and occult bleeding （P 〈0.05） were significantly greater in the toumiquet group than in the control group. There was no significant difference in the total amount of blood loss between the two groups （P 〉0.05）.Conclusions Tourniquet can reduce bleeding during total knee replacement surgery, but is associated with greater visible and invisible blood loss.

关键词： blood loss total knee arthroplasty tourniquet

Optical Pulse Compression Based on High-doped Erbium Fiber Amplifier and Standard Single-mode Fiber

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Semiconductor Photonics and Technology 2008年第2期14卷 90-94页

作者： REN Jing JIA Dong-fang liu yang LI ya-bin Optoelectronic Information Science and Technology Lab College of PrecisionInstrument and Optoelectronics Engineering Tianjin University Tianjin 300072 CHN

Proposed is a novel optical pulse compression technique based on high-doped erbium fiber amplifier and standard single-mode fiber(SMF). We used the amplifier with the erbium ion concentration of 6.3×10-3 to amplify a hyperbolic secant pulse from a regeneratively mode-locked fiber laser. The central wavelength, pulsewidth and peak power of the pulse are 1 550 nm, 12.5 ps and 3 mW, respectively. Then the amplified pulse with peak power level corresponding to a higher-order soliton is compressed when it propagates through a 3-km-long single-mode fiber. Studied are the compressed pulses under different pump powers and fiber lengths. The results show that it can get a narrower pulse, and solve the difficulty that pulses at low power can not be compressed directly in the fiber. And the construct is compact.

关键词： high-doped erbium fiber amplifier soliton single mode fiber(SMF) pulse compression

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葛兰西文化霸权理论与萨义德东方主义之比较

安徽大学学报（哲学社会科学版） 2005年第4期29卷 138-144页

作者：刘亚斌四川大学文学与新闻学院四川成都610064

萨义德的东方主义是葛兰西文化霸权理论的一种延伸,是其权力逻辑在东西方文化关系之间一个新方向上的拓展,从文化领域向知识话语即东方学学科领域的深入与扩散,巩固了西方的意识形态霸权,使文化霸权问题进一步复杂化、顽固化。本文详细... 详细信息

萨义德的东方主义是葛兰西文化霸权理论的一种延伸,是其权力逻辑在东西方文化关系之间一个新方向上的拓展,从文化领域向知识话语即东方学学科领域的深入与扩散,巩固了西方的意识形态霸权,使文化霸权问题进一步复杂化、顽固化。本文详细地分析了文化霸权理论与东方主义两个方面的相同点,剖析了其理论本身存在的三个方面的不同之处以及理论的现实目的的根本差异,使我们对无产阶级复杂的革命斗争、帝国主义的本质与殖民史有更为清晰的认识。

关键词：葛兰西文化霸权萨义德东方主义比较

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马克思主义及其运动:文化霸权理论的前奏曲

兰州大学学报（社会科学版） 2005年第3期33卷 33-39页

作者：刘亚斌四川大学文学与新闻学院四川成都610064

葛兰西的文化霸权理论不是凭空产生的,它有其前奏曲。其产生既有无产阶级现实斗争需要的原因,也是经典马克思主义文艺思想的逻辑发展,还包含了对无产阶级革命经验的总结。针对国内学界对文化霸权理论的“误读”,有必要对其进行“历史性... 详细信息

葛兰西的文化霸权理论不是凭空产生的,它有其前奏曲。其产生既有无产阶级现实斗争需要的原因,也是经典马克思主义文艺思想的逻辑发展,还包含了对无产阶级革命经验的总结。针对国内学界对文化霸权理论的“误读”,有必要对其进行“历史性”的还原与反思。

关键词：葛兰西文化霸权马克思主义无产阶级运动

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“文化霸权”话语的本土实践与反思

南京师大学报（社会科学版） 2006年第1期 115-120,137页

作者：刘亚斌四川大学文学与新闻学院四川成都610064

“文化霸权”成为1990年代以来人们谈论东西方文学与文化关系时所使用的关键词之一,开创了在中国文论语境下的“理论旅行”。它从思维模式的“二元对立”、话语领域的西方霸权、民族情结的强烈诉求与传统文化的回归和高扬等四个方面展... 详细信息

“文化霸权”成为1990年代以来人们谈论东西方文学与文化关系时所使用的关键词之一,开创了在中国文论语境下的“理论旅行”。它从思维模式的“二元对立”、话语领域的西方霸权、民族情结的强烈诉求与传统文化的回归和高扬等四个方面展开其话语实践。在其话语实践中,重新陷入了“文革话语”的历史圈套,遮蔽了我国文论发展的历史与现实以及所面临的问题,对西方进行想象化的本质处理与传统文化的异化塑形,彰显出本土权力的运作机制。我国文论应该在世界文论体系的观照下实现自身的现代化,为世界文论的发展做出特有的贡献,促进文论知识科学有序增长。

关键词：文化霸权话语本土实践现代化

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葛兰西“文化霸权”的建构

河北大学学报（哲学社会科学版） 2005年第2期30卷 88-91页

作者：刘亚斌四川大学文学与新闻学院四川成都610064

文化霸权是一套具有浓厚政治色彩的意识形态话语。它与葛兰西的实践哲学、国家构成理论以及政治权力理论有着不可分割的联系。实践哲学是其理论基础,市民社会与政治社会的分层关系为其理论架构提供了可能,而政治权力中的另一种权力观念... 详细信息

文化霸权是一套具有浓厚政治色彩的意识形态话语。它与葛兰西的实践哲学、国家构成理论以及政治权力理论有着不可分割的联系。实践哲学是其理论基础,市民社会与政治社会的分层关系为其理论架构提供了可能,而政治权力中的另一种权力观念———"同意"则成为其理论的核心,也是其理论独创性之所在。

关键词：葛兰西文化霸权实践哲学市民社会