检索结果-南通市图书馆

Evaluation of rainfall threshold models for debris flow initiation in the Jiangjia Gully,Yunnan Province,China

Journal of Mountain Science 2024年第6期21卷 1799-1813页

作者： YANG Hongjuan zhang Shaojie HU Kaiheng WEI Fangqiang LIU Yanhui State Key Laboratory of Mountain Hazards and Engineering Resilience Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610299China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China Chongqing School University of Chinese Academy of SciencesChongqing 400714China China Institute of Geo-Environment Monitoring Beijing 100081China

Systematically determining the discriminatory power of various rainfall properties and their combinations in identifying debris flow occurrence is crucial for early warning *** this study,we evaluated the discriminatory power of different univariate and multivariate rainfall threshold models in identifying triggering conditions of debris flow in the Jiangjia Gully,Yunnan Province,*** univariate models used single rainfall properties as indicators,including total rainfall(R_(tot)),rainfall duration(D),mean intensity(I_(mean)),absolute energy(Eabs),storm kinetic energy(E_(s)),antecedent rainfall(R_(a)),and maximum rainfall intensity over various durations(I_(max_dur)).The evaluation reveals that the I_(max_dur)and Eabs models have the best performance,followed by the E_(s),R_(tot),and I_(mean)models,while the D and R_(a)models have poor ***,the I_(max_dur)model has the highest performance metrics at a 40-min *** used logistic regression to combine at least two rainfall properties to establish multivariate threshold *** results show that adding D or R_(a)to the models dominated by Eabs,E_(s),R_(tot),or I_(mean)generally improve their performances,specifically when D is combined with I_(mean)or when R_(a)is combined with Eabs or E_(s).Including R_(a)in the I_(max_dur)model,it performs better than the univariate I_(max_dur)model.A power-law relationship between I_(max_dur)and R_(a)or between Eabs and R_(a)has better performance than the traditional I_(mean)–D model,while the performance of the E_(s)–R_(a)model is *** evaluation reemphasizes the important role of the maximum intensity over short durations in debris flow *** also highlights the importance of systematically investigating the role of R_(a)in establishing rainfall thresholds for triggering debris *** the regional variations in rainfall patterns worldwide,it is necessary to evaluate the findings of this study across diverse watersheds.

关键词： Rainfall threshold Logistic regression Maximum rainfall intensity Absolute energy Antecedent rainfall

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of Gaussian Beam Summation Migration in Reflected In-seam Wave Imaging

引用

Acta Geologica Sinica(English Edition) 2024年第1期98卷 276-284页

作者： HAN Jianguang LÜQingtian zhang Zhiheng YANG Shun WANG Shuo Chinese Academy of Geological Sciences Beijing 100037China Shandong Taishan Resources Exploration Co. Ltd.Jinan 250104China

The geological conditions for coal mining in China are complex,with various structural issues such as faults and collapsed columns seriously compromising the safety of coal mine ***-seam wave exploration is an effective technique for acquiring detailed information on geological structures in coal seam working ***,the existing reflected in-seam wave imaging technique can no longer meet the exploration precision requirements,making it imperative to develop a new reflected in-seam wave imaging *** study applies the Gaussian beam summation(GBS)migration method to imaging coal seams'reflected in-seam wave ***,with regard to the characteristics of the reflected in-seam wave data,methods such as wavefield removal and enveloped superposition are employed for the corresponding wavefield separation,wave train compression and other processing of reflected in-seam ***,imaging is performed using the GBS migration *** feasibility and effectiveness of the proposed method for reflected in-seam wave imaging are validated by conducting GBS migration tests on 3D coal-seam fault models with different dip angles and *** applying the method to reflected in-seam wave data for an actual coal seam working face,accurate imaging of a fault structure is obtained,thereby validating its practicality.

关键词： reflected in-seam wave Gaussian beam summation migration numerical tests fault

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FaSnRK1a mediates salicylic acid pathways to enhance strawberry resistance to botrytis cinerea

引用

Horticultural Plant Journal 2024年第1期10卷 131-144页

作者： Jingjing Luo Wenying Yu yuansong Xiao Yafei zhang Futian Peng State Key Laboratory of Crop Biology College of Horticulture Science and EngineeringShandong Agricultural UniversityTaianShandong 271018China

Strawberry is a major fruit crop worldwide because its nutritional and health benefits to human health,but its productivity is limited by botrytis *** nonfermentation 1-related protein kinase 1(SnRK1)has a defense function against pathogens,but the function of SnRK1 in the defense response to *** in plants is still *** this study,FaSnRK1a-OE and RNAi fruits were constructed and then inoculated with *** result reveals a positive role of Fa SnRK1a in the regulation of resistance to gray ***1a affects SA content by regulating FaPAL1 and FaPAL2 *** genes related to the SA signaling pathway(FaTGA1 and FaTGA2.1)were significantly increased/decreased in FaSnRK1a-OE or FaSnRK1a-RNAi fruit,***1a interacted with the FaWRKY33.2 protein and negatively regulated FaWRKY33.2 expression,and FaWRKY33.2 acts as a repressor of disease resistance to ***,FaSnRK1a regulates the expression of six PR genes and the activities of antioxidant enzymes to boost defense response after *** *** findings showed that FaSnRK1a increases the resistance of strawberry fruit to *** via SA signaling pathway and interaction with the FaWRKY33.2 transcription factor.

关键词： Strawberry B.cinerea SnRK1 Salicylic acid WRKY transcription factor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Improved Thermal Conductivity Measurement Scheme for Macroscopic Graphitic Films Using the Laser Flash Method

引用

Journal of Thermal Science 2024年第4期33卷 1480-1490页

作者： zhang Peijuan MING Xin LIU Yingjun WANG Xuelong SHI Hang HAO yuanyuan LU Jiahao LIU Zheng LAI Haiwen zhang Ying GAO Weiwei XU Zhen GAO Chao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou310027China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030032China Special Equipment Safety Supervision and Inspection Institute of Jiangsu Province National Graphene Products Quality Inspection and Testing Center(Jiangsu)Wuxi214174China Hangzhou Gaoxi Technol Co. LtdHangzhou311113China China Academy of Aerospace Aerodynamics Beijing100074China

Achieving efficient thermal management urges to exploit high-thermal-conductivity materials to satisfy the boosted demand of heat *** is critical to adopt standardized characterization protocols to evaluate the intrinsic thermal conductivity of thermal management ***,for the most representative laser flash method,the lack of standard measurement methodology and systematic description on the thermal diffusivity and influencing factors has led to significant deviations and confusion of the thermal conduction performance in the emerging thermal management ***,the measurement error factors of thermal diffusivity by the common laser flash analyzer(LFA)are *** high-thermal-conductivity graphitic film(GF)as a typical case,the key factors are analyzed to guide the measurement protocol of related carbon-based thermal management *** basic principle of the LFA measurement,actual pre-processing conditions,instrument parameters setting,and data analysis are elaborated for accurate ***,the graphene thick films and common isotropic materials are also extended to meet various thermal measurement *** on the existing practical problems,we propose a feasible test flow to achieve a unified and standardized thermal conductivity measurement,which is beneficial to the rapid development of carbon-based thermal management materials.

关键词： thermal management graphitic film laser flash method thermal conductivity thermal diffusivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of the Conditional Nonlinear Local Lyapunov Exponent to Second-Kind Predictability

引用

Advances in Atmospheric Sciences 2024年第9期41卷 1769-1786页

作者： Ming zhang Ruiqiang DING Quanjia ZHONG Jianping LI Deyu LU State Key Laboratory of Earth Surface Processes and Resource Ecology(ESPRE)/Key Laboratory of Environmental Change and Natural Disasters of Chinese Ministry of EducationBeijing Normal UniversityBeijing 100875China Department of Ocean Science Hong Kong University of Science and TechnologyHong KongChina College of Oceanic and Atmospheric Sciences/Frontiers Science Center for Deep Ocean Multispheres and Earth System(DOMES)/Key Laboratory of Physical Oceanography Ministry of Education/Academy of the Future Ocean/Center for Ocean Carbon NeutralityOcean University of ChinaQingdao 266100China Laoshan Laboratory Qingdao 266237China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth Science University of Chinese Academy of SciencesBeijing 100049China

In order to quantify the influence of external forcings on the predictability limit using observational data,the author introduced an algorithm of the conditional nonlinear local Lyapunov exponent(CNLLE)*** effectiveness of this algorithm is validated and compared with the nonlinear local Lyapunov exponent(NLLE)and signal-to-noise ratio methods using a coupled Lorenz *** results show that the CNLLE method is able to capture the slow error growth constrained by external forcings,therefore,it can quantify the predictability limit induced by the external *** this basis,a preliminary attempt was made to apply this method to measure the influence of ENSO on the predictability limit for both atmospheric and oceanic variable *** spatial distribution of the predictability limit induced by ENSO is similar to that arising from the initial conditions calculated by the NLLE *** similarity supports ENSO as the major predictable signal for weather and climate *** addition,a ratio of predictability limit(RPL)calculated by the CNLLE method to that calculated by the NLLE method was *** RPL larger than 1 indicates that the external forcings can significantly benefit the long-term predictability *** instance,ENSO can effectively extend the predictability limit arising from the initial conditions of sea surface temperature over the tropical Indian Ocean by approximately four months,as well as the predictability limit of sea level pressure over the eastern and western Pacific ***,the impact of ENSO on the geopotential height predictability limit is primarily confined to the troposphere.

关键词： conditional nonlinear local Lyapunov exponent second-kind predictability coupled Lorenz model ENSO

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于GEO数据库筛选胃癌差异表达基因及其功能和通路富集分析

引用

南方医科大学学报 2024年第3期44卷 605-616页

作者：梁一豪赖颖君袁燕文袁炜张锡波张拔山卢志锋南方医科大学第十附属医院(东莞市人民医院)检验科广东东莞523059 南方医科大学第十附属医院(东莞市人民医院)消化内科广东东莞523059 南方医科大学第十附属医院(东莞市人民医院)病理科广东东莞523059

目的基于基因表达数据库(GEO)运用生物信息学方法挖掘胃癌诊断和预后相关的核心基因,筛选参与胃癌发生发展的分子靶标。方法从GEO数据库中下载胃癌基因芯片数据GSE118916、GSE54129和GSE79973,筛选差异表达基因(DEGs)并进行分子功能和... 详细信息

目的基于基因表达数据库(GEO)运用生物信息学方法挖掘胃癌诊断和预后相关的核心基因,筛选参与胃癌发生发展的分子靶标。方法从GEO数据库中下载胃癌基因芯片数据GSE118916、GSE54129和GSE79973,筛选差异表达基因(DEGs)并进行分子功能和信号通路的富集分析,构建蛋白质互作网络(PPI),根据网络节点和位置筛选出核心基因,利用癌症基因图谱(TCGA)中胃腺癌(STAD)的全基因组测序数据对核心基因进行表达水平和诊断预后的验证分析,最后通过qRT-PCR检测核心基因在不同胃癌细胞株中的表达水平。结果共筛选出77个DEGs,主要位于细胞外基质(ECM)与基底膜,具有氧化还原酶和ECM受体配体活性,参与机体消化和激素代谢等生物学过程,与胃酸分泌、视黄醇和激素代谢等信号通路相关。共获得9个核心基因,其中SPARC、TIMP1、THBS2、COL6A3和THY1在胃癌中表达上调(P<0.05);而TFF1、GKN1、TFF2、PGC在胃癌中下调(P<0.05)。生存预后分析显示,SPARC、TIMP1、THBS2、COL6A3、TFF2、THY1的异常表达与胃癌患者的生存时间显著相关;ROC曲线显示,TIMP1、SPARC、THY1、THBS2对胃癌有较高的诊断价值;在胃癌患者的病理组织中SPARC、TIMP1、THBS2、COL6A3的高表达得到验证;qRT-PCR检测发现,核心基因在不同的胃癌细胞株中不尽相同,但表达趋势基本符合。结论SPARC、TIMP1、THBS2等DEGs可能与胃癌的发生发展有关,可能作为潜在的候选分子标志物,用于胃癌的早期诊断和预后判断。

关键词：胃癌基因芯片生物信息学分析差异表达基因分子标志物

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The importance of data assimilation components for initial conditions and subsequent error growth

引用

Science China Earth Sciences 2024年第1期67卷 105-116页

作者： Zhongrui WANG Haohao SUN Lili LEI Zhe-Min TAN Yi zhang Key Laboratory of Mesoscale Severe Weather Ministry of Educationand School of Atmospheric SciencesNanjing UniversityNanjing 210023China Frontiers Science Center for Critical Earth Material Cycling Nanjing UniversityNanjing 210023China

Despite a specific data assimilation method,data assimilation(DA)in general can be decomposed into components of the prior information,observation forward operator that is given by the observation type,observation error covariances,and background error *** a classic Lorenz model,the influences of the DA components on the initial conditions(ICs)and subsequent forecasts are systematically investigated,which could provide a theoretical basis for the design of DA for different scales of *** forecast errors undergo three typical stages:a slow growth stage from 0 h to 5 d,a fast growth stage from 5 d to around 15 d with significantly different error growth rates for ensemble and deterministic forecasts,and a saturation stage after 15 *** strategies that provide more accurate ICs can improve the *** assimilation is superior to offline assimilation,and a flow-dependent background error covariance matrix(Pf)provides better analyses than a static background error covariance matrix(B)for instantaneous observations and frequent time-averaged observations;but the opposite is true for infrequent time-averaged observations,since cycling simulation cannot construct informative priors when the model lacks predictive skills and the flow-dependent Pf cannot effectively extract information from low-informative observations as the static *** observations contain more information than time-averaged observations,thus the former is preferred,especially for infrequent observing ***,ensemble forecasts have advantages over deterministic forecasts,and the advantages are enlarged with less informative observations and lower predictive-skill model priors.

关键词： Data assimilation Atmospheric predictability Background error covariances Ensemble forecasts

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Layered Coded Cache Placement and Cooperative Delivery with Sharing Links in Satellite-Terrestrial Integrated Networks

引用

China Communications 2024年第3期21卷 217-229页

作者： Gu Shushi Chen Zihan Wu Yaonan zhang Qinyu Wang Ye School of Electronic and Information Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Guangdong Provincial Key Laboratory of Aerospace Communication and Networking Technology Shenzhen 518055China Broadband Communications Research Department Pengcheng LaboratoryShenzhen 518052China

Cooperative utilization of multidimensional resources including cache, power and spectrum in satellite-terrestrial integrated networks(STINs) can provide a feasible approach for massive streaming media content delivery over the seamless global coverage area. However, the on-board supportable resources of a single satellite are extremely limited and lack of interaction with others. In this paper, we design a network model with two-layered cache deployment, i.e., satellite layer and ground base station layer, and two types of sharing links, i.e., terrestrial-satellite sharing(TSS) links and inter-satellite sharing(ISS) links, to enhance the capability of cooperative delivery over STINs. Thus, we use rateless codes for the content divided-packet transmission, and derive the total energy efficiency(EE) in the whole transmission procedure, which is defined as the ratio of traffic offloading and energy consumption. We formulate two optimization problems about maximizing EE in different sharing scenarios(only TSS and TSS-ISS),and propose two optimized algorithms to obtain the optimal content placement matrixes, *** results demonstrate that, enabling sharing links with optimized cache placement have more than 2 times improvement of EE performance than other traditional placement schemes. Particularly, TSS-ISS schemes have the higher EE performance than only TSS schemes under the conditions of enough number of satellites and smaller inter-satellite distances.

关键词： coded content placement cooperative delivery energy efficiency sharing links STINs

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Genomic selection of eight fruit traits in pear

引用

Horticultural Plant Journal 2024年第2期10卷 318-326页

作者： Manyi Sun Mingyue zhang Satish Kumar Mengfan Qin Yueyuan Liu Runze Wang Kaijie Qi Shaoling zhang Wenjing Chang Jiaming Li Jun Wu College of Horticulture State Key Laboratory of Crop Genetics&Germplasm Enhancement and UtilizationNanjing Agricultural UniversityNanjingJiangsu 210095China State Key Laboratory of Crop Biology College of Horticulture Science and EngineeringShandong Agricultural UniversityTai'anShandong 271018China The New Zealand Institute for Plant and Food Research Limited Private Bag 1401Havelock North 4157New Zealand Zhongshan Biological Breeding Laboratory NanjingJiangsu 210014China

Genomic selection (GS) has the potential to improve selection efficiency and shorten the breeding cycle in fruit tree breeding. In this study,we evaluated the effect of prediction methods, marker density and the training population (TP) size on pear GS for improving its performance and reducing cost. We evaluated GS under two scenarios:(1) five-fold cross-validation in an interspecific pear family;(2) independent validation. Based on the cross-validation scheme, the prediction accuracy (PA) of eight fruit traits varied between 0.33 (fruit core vertical diameter)and 0.65 (stone cell content). Except for single fruit weight, a slightly better prediction accuracy (PA) was observed for the five parametrical methods compared with the two non-parametrical methods. In our TP of 310 individuals, 2 000 single nucleotide polymorphism (SNP) markers were sufficient to make reasonably accurate predictions. PAs for different traits increased by 18.21%-46.98%when the TP size increased from 50to 100, but the increment was smaller (-4.13%-33.91%) when the TP size increased from 200 to 250. For independent validation, the PAs ranged from 0.11 to 0.45 using rrBLUP method. In summary, our results showed that the TP size and SNP numbers had a greater impact on the PA than prediction methods. Furthermore, relatedness among the training and validation sets, and the complexity of traits should be considered when designing a TP to predict the test panel.

关键词： Pear Pyrus Prediction method TP size SNP marker number

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evidence-based rehabilitation medicine:definition,foundation,practice and development

引用

Medical Review 2024年第1期4卷 42-54页

作者： Jinlong zhang Chengqi He Department of Rehabilitation Medicine West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Rehabilitation Medicine West China HospitalSichuan UniversityNo.37 Guoxue AlleyChengdu 610041Sichuan ProvinceChina

To determine the definition,foundation,practice,and development of evidence-based rehabilitation medicine(EBRM)and point out the development direction for *** the database of PubMed,Cochrane Library,Embase,China national knowledge infrastructure(CNKI),Wanfang,and China science and technology journal database(CSTJ).The search was conducted from the establishment of the database to June *** key words are“rehabilitation medicine and evidence based”in Chinese and *** reading the abstract or full text of the literature,a summary analysis is conducted to determine the definition,foundation,practice,and development of EBRM.A total of 127 articles were *** development of 14 sub majors in EBRM are not balanced,evidence-based musculoskeletal rehabilitation medicine(EBMRM)(31 articles,mainly focuses on osteoarthritis,osteoporosis and musculoskeletal pain),evidence-based neurorehabilitation medicine(EBNM)(34 articles,mainly concentrated in stroke,traumatic brain injury and spinal cord injury)and evidencebased education rehabilitation medicine(EBEDRM)(17 articles,mainly focuses on educational methodology),evidence-based nursing rehabilitation medicine(EBNRM)(2 articles),evidence-based engineering rehabilitation medicine(EBENRM)(7 articles),evidence-based traditional Chinese rehabilitation medicine(EBTCRM)(3 articles),evidence-based internal rehabilitation medicine(EBIRM)(11 articles),evidence-based intensive care rehabilitation medicine(EBICRM)(4 articles),evidence-based oncology rehabilitation medicine(EboRM)(6 articles),evidence-based physical therapy medicine(EBPTM)(3 articles),evidencebased cardiopulmonary rehabilitation medicine(EBCRM)(6 articles),evidence-based speech therapy medicine(EBSTM)/evidence-based occupation therapy medicine(EboTM)/evidence-based geriatric rehabilitation medicine(EBGRM)(1 article).The EBMRM,EBNM and EBEDRM are relatively well *** development of EBNRM,EBENRM,EBTCRM,EBIRM,EBICRM,EBGRM,EboRM,EBC

关键词： evidence-based medicine rehabilitation medicine evidence-based rehabilitation medicine system evaluation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：