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Effect of land use on soil nematode community composition and co-occurrence network relationship

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Journal of Integrative Agriculture 2024年第8期23卷 2807-2819页

作者： Xiaotong liu Siwei liang Yijia Tian Xiao Wang Wenju liang Xiaoke Zhang Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China Tillage and Cultivation Research Institute Liaoning Academy of Agricultural SciencesShenyang 110161China University of Chinese Academy of Sciences Beijing 100049China Key Lab of Conservation Tillage and Ecological Agriculture in Liaoning Province Shenyang 110016China

Land use influences soil biota community composition and diversity,and then belowground ecosystem processes and *** characterize the effect of land use on soil biota,soil nematode communities in crop land,forest land and fallow land were investigated in six regions of northern *** richness,diversity,abundance and biomass of soil nematodes was the lowest in crop *** richness and diversity of soil nematodes were 28.8and 15.1%higher in fallow land than in crop land,*** significant differences in soil nematode indices were found between forest land and fallow land,but their network keystone genera composition was *** the keystone genera,50%of forest land genera were omnivores-predators and 36%of fallow land genera were *** proportion of fungivores in forest land was 20.8%lower than in fallow *** network complexity and the stability were lower in crop land than forest land and fallow *** pH,NH_(4)^(+)-N and NO_(3)^(–)-N were the major factors influencing the soil nematode community in crop land while soil organic carbon and moisture were the major factors in forest *** nematode communities in crop land influenced by artificial management practices were more dependent on the soil environment than communities in forest land and fallow *** use induced soil environment variation and altered network relationships by influencing trophic group proportions among keystone nematode genera.

关键词： soil nematode trophic groups community composition co-occurrence network land use

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低磷血症的临床诊断与治疗

中国实用内科杂志 2024年第5期44卷 380-384页

作者：韩文霞刘心如山东第一医科大学附属省立医院内分泌代谢病科山东济南250021 山东中医药大学第一临床医学院山东济南250014

低磷血症是临床上常见的电解质紊乱之一,常伴有钙的代谢紊乱。临床上引起低磷血症的原因很多,且临床症状表现不一,缺乏特异性,容易被误诊。文章主要综述了低磷血症的原因、临床表现、实验室检查、诊断以及低磷血症的治疗,为临床医师提... 详细信息

低磷血症是临床上常见的电解质紊乱之一,常伴有钙的代谢紊乱。临床上引起低磷血症的原因很多,且临床症状表现不一,缺乏特异性,容易被误诊。文章主要综述了低磷血症的原因、临床表现、实验室检查、诊断以及低磷血症的治疗,为临床医师提供诊疗思路。

关键词：低磷血症成纤维生长因子23 诊断治疗

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海洋观视角下海洋城市发展的历史回顾与国际比较

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南方建筑 2024年第10期 1-9页

作者：王世福练东鑫龙海燕刘铮华南理工大学建筑学院、亚热带建筑与城市科学全国重点实验室

海洋观是人类在生产生活中对海洋的总体认识,随着海洋科技与国际关系发展而持续演变,为厘清不同历史时期海洋城市的差异特征提供了重要的研究视角。基于文献综述与类型归纳相结合的方法,重点关注海洋观变迁下全球典型海洋城市发展的空... 详细信息

海洋观是人类在生产生活中对海洋的总体认识,随着海洋科技与国际关系发展而持续演变,为厘清不同历史时期海洋城市的差异特征提供了重要的研究视角。基于文献综述与类型归纳相结合的方法,重点关注海洋观变迁下全球典型海洋城市发展的空间演变与发展趋势。研究发现,在殖民、后殖民、全球化海洋观演变过程中,海洋城市职能从早期的贸易型逐渐转变为产业型与服务型,其战略属性主要体现为在全球、区域与国家多维空间尺度下的连通性、撬动性与支撑性。应充分发挥海洋城市战略属性,面向世界级海洋城市群开展现代海洋城市建设。

关键词：海洋观海洋城市空间模式港城关系海洋治理海洋战略

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Three‑Dimensional Nano‑displacement Measurement by Four‑Beam Laser Interferometry

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Nanomanufacturing and Metrology 2024年第2期7卷 42-49页

作者： Xu Zhang Zi Wang Mengnan liu Zhengxun Song Zuobin Wang Litong Dong International Research Centre for Nano handling and Manufacturing of China Changchun University of Science and TechnologyChangchun 130022China Centre for Opto/Bio‑Nano Measurement and Manufacturing Zhongshan Institute of Changchun University of Science and TechnologyZhongshan 528437China Ministry of Education Key Laboratory for Cross‑Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022China JR3CN&IRAC University of BedfordshireLuton LU13JUUK

A 3D nano-displacement measurement method,where the difference in phase between the beams in a four-beam laser interference is changed,is *** results demonstrate that the variation of phase difference causes the deviation of the interference pattern in the laser interference *** on this theory,we design and build a four-beam laser interference *** corner cube prism in the optical path is shifted,and the phase of the beam is changed by applying different voltages to a piezoelectric *** phase difference is obtained by analyzing the lattice pattern with subpixel precision,and then the displacement is determined by correlation *** experimental measurement results are consistent with the theoretical analysis,thereby verifying the feasibility of this measurement method.

关键词： Four-beam laser interferometry Phase difference 3D displacement Correlation operation

无人机群辅助边缘计算系统的任务卸载和资源分配联合优化

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系统工程与电子技术 2024年第2期46卷 751-760页

作者：刘世豪黄仰超胡航司江勃韩蕙竹安琪空军工程大学信息与导航学院陕西西安710077 西安电子科技大学综合业务网理论及关键技术国家重点实验室陕西西安710071

为提升无人机群辅助边缘计算系统在负载不均衡场景下的性能,构建了一种新的无人机群边缘计算系统,利用无人机之间卸载数据来提高计算资源的利用率,通过联合优化多架无人机的卸载方案、部署和资源分配,使得系统的时延和能耗加权和最小。... 详细信息

为提升无人机群辅助边缘计算系统在负载不均衡场景下的性能,构建了一种新的无人机群边缘计算系统,利用无人机之间卸载数据来提高计算资源的利用率,通过联合优化多架无人机的卸载方案、部署和资源分配,使得系统的时延和能耗加权和最小。该问题高度非凸,为此提出一种高效的双层优化算法——启发最优评价算法,上层使用粒子群算法优化无人机位置,下层在确定位置的情况下使用块坐标下降算法优化无人机的数据卸载和资源分配。仿真结果表明,所提方案可有效降低系统成本,与基准策略相比优势明显。

关键词：边缘计算无人机群任务卸载资源分配位置优化

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Distinct phosphorylation optimizes pathogen-induced PA and ROs bursts

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Molecular Plant 2024年第4期17卷 525-527页

作者： Kaihuai Lil Ruize Zhang Yong Wang Fengquan liu Zheng Qing Fu Department of Plant Pathology College of AgricultureGuizhou UniversityGuiyang 550025China Department of Biological Sciences University of South CarolinaColumbiaSC29208USA Institute of Plant Protection Jiangsu Academy of Agricultural SciencesNanjingJiangsu 210014China

Phospholipids hold a multifaceted function in cellular *** primary function of phospholipids is to serve as essential building blocks of cell membranes,which gives cells crucial structural support and facilitates cellular *** that,phospholipids also act as key signaling molecules that coordinate vital cellular processes such as organismal development,homeostasis,and adaptation to environmental *** being the smallest and simplest phospholipid,phosphatidic acid(PA)plays a crucial role as a metabolic intermediate and second messenger.

关键词： homeostasis lipids smallest

混凝土帽盖模型参数标定及桥梁冲击损伤模拟应用

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中国公路学报 2024年第5期37卷 151-174页

作者：宋彦臣刘学鹏王君杰韩强北京工业大学桥梁工程安全与韧性全国重点实验室北京100124 同济大学桥梁工程系上海200092

冲击荷载作用下混凝土响应与应力状态、应变率密切相关,数值分析存在本构模型理论复杂、参数繁多,工程应用困难等问题。基于弹塑性损伤帽盖模型,针对拉伸、压缩、剪切应力状态下混凝土的损伤特征,阐明了损伤参数取值与单元尺寸的依赖关... 详细信息

冲击荷载作用下混凝土响应与应力状态、应变率密切相关,数值分析存在本构模型理论复杂、参数繁多,工程应用困难等问题。基于弹塑性损伤帽盖模型,针对拉伸、压缩、剪切应力状态下混凝土的损伤特征,阐明了损伤参数取值与单元尺寸的依赖关系,提出了混凝土本构模型损伤参数及率效应参数的确定方法。然后,针对冲击作用下RC构件的弯曲与剪切损伤破坏行为,基于构件冲击试验分别从损伤参数的单元尺寸依赖性、剪胀损伤模拟必要性2个方面对混凝土弹塑性损伤帽盖模型参数取值的可靠性进行了验证,并对2种常用弹塑性损伤帽盖模型进行了对比。最后,基于某大桥船撞损伤破坏事故案例,进一步对大桥的船撞破坏过程进行了模拟验证。结果表明:采用所提出损伤参数标定方法可以很好地描述冲击作用下混凝土构件及结构在不同受力状态下的损伤演化过程及动态响应,解决了弹塑性损伤帽盖模型参数过多、取值困难而不便应用问题,可为混凝土桥梁结构冲击数值分析提供参考。

关键词：桥梁工程混凝土桥梁弹塑性损伤帽盖模型参数标定低速冲击仿真验证

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Risk evaluation for the task transfer of an aircraft maintenance program based on a multielement connection number

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Frontiers of Engineering Management 2024年第1期11卷 16-31页

作者： Tao liu Zhibo SHI Huifen DONG Jie BAI Yu YAN College of Electronics Information and Automation Civil Aviation University of ChinaTianjin 300300China College of Airworthiness Civil Aviation University of ChinaTianjin 300300China

This paper proposes a framework for evaluating the efficacy and suitability of maintenance programs with a focus on quantitative risk assessment in the domain of aircraft maintenance task transfer. The analysis is anchored in the principles of Maintenance Steering Group-3 (MSG-3) logic decision paradigms. The paper advances a holistic risk assessment index architecture tailored for the task transfer of maintenance programs. Utilizing the analytic network process (ANP), the study quantifies the weight interrelationships among diverse variables, incorporating expert-elicited subjective weighting. A multielement connection number-based evaluative model is employed to characterize decision-specific data, thereby facilitating the quantification of task transfer-associated risk through the appraisal of set-pair potentials. Moreover, the paper conducts a temporal risk trend analysis founded on partial connection numbers of varying orders. This analytical construct serves to streamline the process of risk assessment pertinent to maintenance program task transfer. The empirical component of this research, exemplified through a case study of the Boeing 737NG aircraft maintenance program, corroborates the methodological robustness and pragmatic applicability of the proposed framework in the quantification and analysis of mission transfer risk.

关键词： risk evaluation maintenance steering group analytic network process task transfer maintenance program

Random Exponential Attractor for Stochastic Non-autonomous Suspension Bridge Equation with Linear Multiplicative White Noise

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Journal of Mathematical Research with Applications 2024年第1期44卷 81-112页

作者： Ling XU Runjie liu Xue BAI College of Mathematics and Statistics Northwest Normal University

In this paper, we mainly consider the long-time behavior of stochastic non-autonomous suspension bridge equation by linear multiplicative white noise with small coefficient. First step,the well-posedness for the cocycle associated with the considered system is established. Second step, the existence of random attractor for the system is investigated. Third step, the upper semicontinuity of random attractor is also provided when the coefficient of random term approaches zero. Fourth step, we prove the regularity of random attractor in a higher regular space by the“iteration” method. Finally, we give the existence of a random exponential attractor for the considered system, which implies the finiteness of fractal dimension of random attractor.

关键词： stochastic non-autonomous suspension bridge equation multiplicative white noise random attractor fractal dimension random exponential attractor