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石灰改良高液限土强度特性的函数模型研究

中国地质灾害与防治学报 2021年第3期32卷 109-117页

作者：胡宏坤邵珠山西安建筑科技大学土木工程学院陕西西安710055 西安建筑科技大学陕西省岩土与地下空间工程重点实验室陕西西安710055

针对广西荔玉高速路基沿线产生的大量高液限土弃方问题,采用生石灰对高液限土进行改良处理。选取弃土场的高液限土,分别配制不同初始含水率、不同石灰掺量的试样进行侧限压缩试验和快剪试验,采用基本初等数学函数模型拟合不同饱和状态... 详细信息

针对广西荔玉高速路基沿线产生的大量高液限土弃方问题,采用生石灰对高液限土进行改良处理。选取弃土场的高液限土,分别配制不同初始含水率、不同石灰掺量的试样进行侧限压缩试验和快剪试验,采用基本初等数学函数模型拟合不同饱和状态、不同初始含水率下石灰掺量对试件压缩特性和抗剪强度影响。结果表明:(1)高液限土的压缩系数随石灰掺量增加呈指数形式减小;(2)不同饱和状态试件的黏聚力和内摩擦角随石灰掺量增加呈二次函数形式变化;(3)高液限土具有水敏性,饱和素土试件最大抗剪强度对应的含水率较击实试验最大干密度对应的含水率高3%~6%;(4)当初始含水率不高于26.73%时,建议石灰掺量不低于6%,否则改良高液限土的石灰掺量不低于8%,可在满足经济性的前提下达到较好的改良效果。

关键词：高液限土石灰掺量压缩特性抗剪强度数学模型

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质子辐射对铌酸锂多功能集成光路器件的影响

半导体光电 2011年第3期32卷 343-347页

作者：郑德晟胡红坤重庆光电技术研究所重庆400060

利用模拟软件SRIM2008计算了质子辐射对铌酸锂多功能集成光路器件(MIOC)的影响,结合质子辐射效应地面模拟试验的结果,分析比较了不同的质子辐射能量和注量对多功能集成光路器件的影响,给出了多功能集成光路器件质子辐射试验的数据和分析... 详细信息

利用模拟软件SRIM2008计算了质子辐射对铌酸锂多功能集成光路器件(MIOC)的影响,结合质子辐射效应地面模拟试验的结果,分析比较了不同的质子辐射能量和注量对多功能集成光路器件的影响,给出了多功能集成光路器件质子辐射试验的数据和分析,讨论了多功能集成光路器件抗质子辐射的能力。

关键词：铌酸锂多功能集成光路器件质子辐射 SRIM2008

易地扶贫搬迁与新型城镇化融合发展研究——以青海海北州为例

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武汉冶金管理干部学院学报 2019年第3期29卷 6-9页

作者：胡宏昆中共海北州委党校

将贫困人口的易地搬迁融入新型城镇化的发展过程,是推动农村人口向市民转变,避免出现“二次城镇化”现象的重要举措。本文以海北藏族自治州为研究对象,深入剖析海北州实施易地扶贫搬迁过程中的现状及问题,在借鉴相关理论的基础上,提出... 详细信息

将贫困人口的易地搬迁融入新型城镇化的发展过程,是推动农村人口向市民转变,避免出现“二次城镇化”现象的重要举措。本文以海北藏族自治州为研究对象,深入剖析海北州实施易地扶贫搬迁过程中的现状及问题,在借鉴相关理论的基础上,提出了海北州易地扶贫搬迁与新型城镇化融合发展在发挥政府规划主导作用、增强内生动力、加大财政支持力度、创新村民治理体系等方面的对策建议,以期为海北州乃至青海省实施易地扶贫搬迁与新型城镇化融合发展提供科学依据与样本参考。

关键词：易地搬迁扶贫新型城镇化海北州

注浆加固和可压缩层联合作用下隧道力学行为研究

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应用力学学报 2020年第5期37卷 2021-2028,I0013,I0014页

作者：邵珠山吴奎胡宏坤赵南南秦溯西安建筑科技大学土木工程学院西安710055 西安建筑科技大学陕西省岩土与地下空间工程重点实验室西安710055

根据高地应力深埋隧道的变形特征,以围岩加固和变形能量释放为原则,提出了注浆加固与可压缩层联合支护的方法,建立了基于注浆加固与可压缩层联合作用下的隧道力学模型;推导了在联合作用下隧道应力场和位移场的解析解,并与数值计算结果... 详细信息

根据高地应力深埋隧道的变形特征,以围岩加固和变形能量释放为原则,提出了注浆加固与可压缩层联合支护的方法,建立了基于注浆加固与可压缩层联合作用下的隧道力学模型;推导了在联合作用下隧道应力场和位移场的解析解,并与数值计算结果进行了对比验证。结果表明:围岩的注浆加固和可压缩层的设置均能有效改善衬砌的受力情况。在其他条件保持不变时,衬砌的压力和位移,以及围岩的位移都随着注浆加固层厚度的增大而减小,但压力和位移的减小趋势随着其厚度的增加而趋于平缓。同样地,可压缩层厚度增大可导致围岩变形能量更充分地耗散,衬砌的压力及位移均随着可压缩层厚度的增大而不断减小,该减小趋势随可压缩层厚度的变化趋于平缓。但是,随着可压缩层厚度的增加,围岩的位移却不断增加。另外,隧道变形的改善效果与可压缩层填充材料的力学参数密切相关,当其弹性模量由26MPa增至160MPa时,衬砌位移迅速增加。因此,该填充材料应具备足够的变形能力才能达到吸收围岩变形、改善衬砌受力的目的。

关键词：深埋隧道注浆加固可压缩层弹性解参数分析

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多层土质边坡降雨入渗过程及稳定性分析

应用力学学报 2021年第3期38卷 981-991页

作者：邵珠山赵南南吴奎胡宏坤秦溯西安建筑科技大学土木工程学院西安710055 西安建筑科技大学陕西省岩土与地下空间工程重点实验室西安710055

降雨是诱发边坡滑坡最常见的因素,降雨入渗会增加非饱和土的渗透力,降低非饱和土的基质吸力,从而降低边坡的稳定安全系数,导致边坡破坏。本文基于Green-Ampt入渗模型,考虑了降雨强度与降雨持时的作用,建立了降雨条件下浅层滑坡的概念模... 详细信息

降雨是诱发边坡滑坡最常见的因素,降雨入渗会增加非饱和土的渗透力,降低非饱和土的基质吸力,从而降低边坡的稳定安全系数,导致边坡破坏。本文基于Green-Ampt入渗模型,考虑了降雨强度与降雨持时的作用,建立了降雨条件下浅层滑坡的概念模型,引入了多层非饱和土计算方法,推导了降雨导致的积水前后边坡稳定安全系数随降雨持时变化的关系式。通过对数值结果和模型结果进行比较发现,二者有较好的一致性。同时,对降雨强度进行研究发现,降雨强度小于边坡表面入渗速度时,降雨完全入渗,且基质吸力不断降低,由于渗透系数相差较大,湿润锋到达土层交界面处时,会在次表面产生积水;当边坡表面积水后,此时入渗速度主要受土层中最小渗透系数影响,入渗速度不断减小,直至与该渗透系数数值相等,降雨强度越大,达到积水的时间越短;当考虑平行边坡渗流时,在土层交界面处的稳定安全系数将发生突变,通过临界边坡稳定性降雨强度与降雨持时的关系曲线,揭示了降雨强度对边坡稳定性的作用规律,并给出三种警戒线,可为多层土质边坡稳定性研究提供一定的理论参考。

关键词：边坡降雨入渗稳定安全系数多层非饱和土

交叉耦合效应对M-Z调制器谐波抑制比的影响

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半导体光电 2022年第6期43卷 1109-1113页

作者：李淼淼胡红坤陆锦东余华华勇重庆光电技术研究所重庆400060 重庆大学光电技术及系统教育部重点实验室重庆400044

针对微波光子链路低噪声高线性度的应用需求,研究了Mach-Zehnder (M-Z)型电光调制器波导交叉耦合效应对谐波抑制比的影响。首先通过OptiBPM和MATLAB联合仿真发现波导间交叉耦合效应会导致调制器射频电极与偏置电极工作点的偏移,进而降... 详细信息

针对微波光子链路低噪声高线性度的应用需求,研究了Mach-Zehnder (M-Z)型电光调制器波导交叉耦合效应对谐波抑制比的影响。首先通过OptiBPM和MATLAB联合仿真发现波导间交叉耦合效应会导致调制器射频电极与偏置电极工作点的偏移,进而降低谐波抑制比;其次利用特制的窄波导间距铌酸锂调制器实测验证了该现象,最后提出了一种能快速检测M-Z型电光调制器交叉耦合效应的方法。文章不仅探索了波导结构对谐波抑制比的影响,还为用于微波光子技术的脊波导及光子晶体薄膜铌酸锂调制器的研制提供了一定参考。

关键词： M-Z型电光调制器交叉耦合效应谐波抑制比

A fuzzy risk assessment model used for assessing the introduction of African swine fever into Australia from overseas

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Artificial Intelligence in Agriculture 2023年第1期7卷 27-34页

作者： hongkun Liu YongLin Ren huanhuan Chu hu Shan Kok Wai Wong College of Veterinary Medicine Qingdao Agriculture UniversityQingdaoPR China Murdoch University 90 South StreetMurdochWestern Australia 6150Australia

African swine fever(ASF)is a contagious and lethal hemorrhagic disease with a high case fatality *** 2007,ASF has been spreading into many countries,especially in Europe and *** that there is no effective vaccine and treatment to deal with ASF,prevention is an important way for a country to avoid the effects of the *** is currently ASF-free but the disease has been reported in many neighboring countries,such as Indonesia,Timor-Leste,and Papua New ***,it is necessary for Australia to maintain hypervigilance to prevent the ASF *** this paper,we propose the use of fuzzy concepts to establish a fuzzy risk assessment model to predict the ASF introduction risk in *** the analysis,the international passengers(IP)and international import trade(IIT)are concluded as the two main ASF introduction factors based on transmission features and past *** the established fuzzy risk assessment model based on the analysis of the 2019 and 2020 data,the risks of ASF introduction into Australia are considered to be *** model further deduced that the Asian region was the major source of potential ***,in order to validate the effectiveness of the established fuzzy risk assessment model,the qualitative data from the Department for Environment,Food&Rural Affairs of the United Kingdom was *** the validation results,it has shown that the results were consistent when the same data is adopted,and thus proved that the functionality of the established fuzzy risk assessment model for assessing the risk in Australia.

关键词： Risk assessment Fuzzy model African swine fever(ASF) ASF introduction Australia

Estimation of Shallow Landslide Susceptibility Incorporating the Impacts of Vegetation on Slope Stability

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International Journal of Disaster Risk Science 2023年第4期14卷 618-635页

作者： hu Jiang Qiang Zou Bin Zhou Yao Jiang Junfang Cui hongkun Yao Wentao Zhou Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment(IMHE)Chinese Academy of Sciences(CAS)Chengdu 610041China China-Pakistan Joint Research Center on Earth Sciences Islamabad 45320Pakistan University of Chinese Academy of Sciences Beijing 100049China

This study aimed to develop a physical-based approach for predicting the spatial likelihood of shallow landslides at the regional scale in a transition zone with extreme *** landslide susceptibility study in an area with diverse vegetation types as well as distinctive geographic factors(such as steep terrain,fractured rocks,and joints)that dominate the occurrence of shallow landslides is *** article presents a novel methodology for comprehensively assessing shallow landslide susceptibility,taking into account both the positive and negative impacts of *** includes considering the positive efects of vegetation canopy interception and plant root reinforcement,as well as the negative efects of plant gravity loading and preferential fow of root *** approach was applied to simulate the regional-scale shallow landslide susceptibility in the Dadu River Basin,a transition zone with rapidly changing terrain,uplifting from the Sichuan Plain to the Qinghai–Tibet *** research fndings suggest that:(1)The proposed methodology is efective and capable of assessing shallow landslide susceptibility in the study area;(2)the proposed model performs better than the traditional pseudo-static analysis method(TPSA)model,with 9.93%higher accuracy and 5.59%higher area under the curve;and(3)when the ratio of vegetation weight loads to unstable soil mass weight is high,an increase in vegetation biomass tends to be advantageous for slope *** study also mapped the spatial distribution of shallow landslide susceptibility in the study area,which can be used in disaster prevention,mitigation,and risk management.

关键词： Physical-based model Qinghai-Tibet Plateau Shallow landslide Susceptibility analysis Vegetation effect

Straw mulch-based no-tillage improves tillering capability of dryland wheat by reducing asymmetric competition between main stem and tillers

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The Crop Journal 2022年第3期10卷 864-878页

作者： hongkun Yang Yun Xiao Peng He Dailong Ai Qiaosheng Zou Jian hu Qiong Liu Xiulan huang Ting Zheng Gaoqiong Fan Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengdu 611130SichuanChina Key Laboratory of Crop Eco-Physiology&Farming System in Southwest China Ministry of Agriculture and Rural AffairsChengdu 611130SichuanChina State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Ministry of Science and TechnologyChengdu 611130SichuanChina

The moisture-conserving effect of straw mulch-based no-tillage(SMNT)is expected to increase fertile spikes and grain yield in environments with rainfall less than 200 ***,the mechanisms under-lying the positive effect of SMNT on wheat tillering are not fully elucidated.A split-plot experiment was designed to investigate the combined effects of SMNT and cultivars on tillering of dryland wheat grown under both dry and favorable *** of SMNT to a cultivar with 1-2 tillers exploited both tillering and kernel-number plasticity,increasing the mean grain yield by 20.5%.This increase was attrib-uted primarily to an increased first-tiller emergence rate resulting from increased N uptake,leaf N con-tent,and N remobilization from tillers to their *** second and third tillers,as transient sinks,contributed to the tiller survival rate,which depends on tiller leaf *** increased total N uptake by SMNT also increased the dry mass yield of tillers and the C:N ratio,reducing the asymmetric compe-tition between main stem and *** to these beneficial effects,reduced mitogen-activated pro-tein kinase(MAPK)and abscisic acid signals were observed under SMNT,whereas indole-3-acetic acid(IAA)signals and genes involved in DNA replication and mismatch repair were *** signals activated three critical transcription factors(the calmodulin-binding transcription activator,GRAS domain,and cysteine-2/histidine-2 family)and further increased rapid drought response and tiller main-tenance after stem *** biosynthesis,sphingolipid biosynthesis,and galactose metabolism were most relevant to increased tillering under SMNT because of their critical role in drought response and lignin *** results suggest that straw mulch-based no-tillage activates rapid drought response and improved wheat tillering by coordinating root N uptake,N remobilization,and asymmetric competition between main stem and tillers.

关键词： Straw mulch-basedno-tillage Wheat tillering Stable isotopetracing Transcriptome Metabolomics