检索结果-南通市图书馆

Effect of land-use changes on chemical and physical properties of soil in western Iran(Zagros oak forests)

Journal of Forestry Research 2020年第2期31卷 637-647页

作者： Kyumars Mohmmadi Samani Narges Pordel Vahid hosseini Zahed Shakeri Department of Forestry Faculty of Natural ResourcesUniversity of KurdistanSanandajIran Center for Research and Development of Northern Zagros Forestry BanehIran

The consequence of land-use change from forest to agriculture and other uses has become one of the world’s greatest *** soil,one of the most important components of forests and containing all the required plant nutrients as soluble ions,is highly impacted by these *** vast areas of the Zagros forests in western Iran have changed in use during the last few decades,the present study investigated the effects of landuse changes of forest area to agriculture,orchard,and agroforestry on soil chemical and physical *** was sampled at four land-use areas:less-disturbed forest areas(control)and agricultural,orchard,and agroforestry *** each of the two forest-use areas(agroforestry and orchard),we selected five trees with similar-sized crowns and sampled under each tree crown at 0-15 and>15-30 cm *** soil samples also were taken in agriculture area at each *** findings indicated that during land-use changes,soil sand particles decreased,and clay and silt particles of soil increased,resulting in a fine soil ***,the amount of nitrogen(N),phosphorus(P),organic carbon(OC),and electrical conductivity(EC)of soil decreased at both depths due to the decrease in organic *** pH and magnesium(Mg)level rose during land-use change at both depths except at agricultural *** potassium(K)content decreased during agricultural use due to the elimination of tree *** level of K decreased only at the depth of 0-15 cm because of K dependency on parent ***,most soil nutrients were affected by plant removal in the *** and agricultural soil are distinguishable by their properties,while land-uses such as agroforestry-orchard separated from the *** nutrients were severely affected by the decrease and elimination of tree cover,plowing,and continuous harvesting,resulting in a decline in soil quality and fertility.

关键词： Chemical soil properties Land-use change Agroforestry Agriculture Zagros Oak forest

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

Effects of Pits and Mounds Following Windthrow Events on Soil Features and Greenhouse Gas Fluxes in a Temperate Forest

引用

Pedosphere 2015年第6期25卷 853-867页

作者： Yahya KOOCH Sakineh Mollaei DARABI Seyed Mohsen hosseini Department of Forestry Faculty of Natural Resources & Marine SciencesTarbiat Modares University

Pit and mound micro-relief(resultant microsites from trees uprooted by windthrow) could have regimes of microclimate and soil features that differ from areas of undisturbed soil. In an attempt to provide a comprehensive evaluation of the significance of pits and mounds on soil features and also the dynamics of greenhouse gas(GHG) fluxes at local scale, this study was carried out in a reserved area of Darabkola forest in Mazandaran Province, northern Iran. The age of a pit and mound was considered equal to the degree of decay of the blown down tree. Three microsites were distinguished, consisting of pit bottom(PB), mound top(MT) and undisturbed area(UA). Soil samples were taken at 0–15 and 15–30 cm depths from all microsites and analysed for soil physical, chemical and biological features. Our findings suggested that in context of forest ecology, pits and mounds following windthrow events should be considered as an effective factor influencing soil features(i.e., density, texture, water content, p H, organic C, total N, available nutrients and earthworm density/biomass) and especially GHG fluxes. Results showed that MT acted as a sink for N2O(-0.010 mg N2 O m-2d-1) and CH4(-0.257 mg CH4m-2d-1) fluxes and also produced lower CO2 concentrations(0.095 mg CO2 m-2d-1) than PB(0.207 mg CO2 m-2d-1) and UA(0.098 mg CO2 m-2d-1). As a consequence, a separation into pits/mounds would be important for a precise budgeting of greenhouse gases.

关键词： carbon dioxide, methane microsite, nitrous oxide oriental beech, uprooted tree

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

Suspended sediment load prediction using non-dominated sorting genetic algorithm Ⅱ

引用

International Soil and Water Conservation Research 2019年第2期7卷 119-129页

作者： Mahmoudreza Tabatabaei Amin Salehpour Jam Seyed Ahmad hosseini Soil Conservation and Watershed Management Research Institute Agricultural ResearchEducation and Extension Organization(AREEO)TehranIran

Awareness of suspended sediment load (SSL) and its continuous monitoring plays an important role in soil erosion studies and watershed *** the common use of the conventional model of the sediment rating curve (SRC) and the methods proposed to correct it,the results of this model are still not sufficiently *** this study,in order to increase the efficiency of SRC model,a multi-objective optimization approach is proposed using the Non-dominated Sorting Genetic Algorithm Ⅱ (NSGA-Ⅱ) *** instantaneous flow discharge and SSL data from the Ramian hydrometric station on the Ghorichay River,Iran are used as a case *** the first part of the study,using self-organizing map (SOM),an unsupervised artificial neural network,the data were clustered and classified as two homogeneous groups as 70% and 30% for use in calibration and evaluation of SRC models,*** the second part of the study,two different groups of SRC model comprised of conventional SRC models and optimized models (single and multi-objective optimization algorithms) were extracted from calibration data set and their performance was *** comparative analysis of the results revealed that the optimal SRC model achieved through NSGA-Ⅱ algorithm was superior to the SRC models in the daily SSL estimation for the data used in this *** that the use of the SRC model is common,the proposed model in this study can increase the efficiency of this regression model.

关键词： Clustering Neural network Non-dominated sorting genetic algorithm Ⅱ (NSGA-Ⅱ) Sediment rating curve Self-organizing map

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

Isogeometric analysis of free-form Timoshenko curved beams including the nonlinear effects of large deformations

引用

Acta Mechanica Sinica 2018年第4期34卷 728-743页

作者： Seyed Farhad hosseini Ali Hashemian Behnam Moetakef-Imani Saied Hadidimoud Sun-Air Research Institute Ferdowsi University of Mashhad Department of Mechanical Engineering Hakim Sabzevari University Department of Mechanical Engineering Ferdowsi University of Mashhad Centre for Manufacturing and Materials Engineering Coventry University

In the present paper, the isogeometric analysis（IGA） of free-form planar curved beams is formulated based on the nonlinear Timoshenko beam theory to investigate the large deformation of beams with variable curvature. Based on the isoparametric concept, the shape functions of the field variables（displacement and rotation） in a finite element analysis are considered to be the same as the non-uniform rational basis spline（NURBS） basis functions defining the geometry. The validity of the presented formulation is tested in five case studies covering a wide range of engineering curved structures including from straight and constant curvature to variable curvature beams. The nonlinear deformation results obtained by the presented method are compared to well-established benchmark examples and also compared to the results of linear and nonlinear finite element analyses. As the nonlinear load-deflection behavior of Timoshenko beams is the main topic of this article, the results strongly show the applicability of the IGA method to the large deformation analysis of free-form curved beams. Finally, it is interesting to notice that, until very recently, the large deformations analysis of free-form Timoshenko curved beams has not been considered in IGA by researchers.

关键词： Curved beams Nonlinear Timoshenko beam theory Large deformation Isogeometric analysis NURBS curves

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

Two-dimensional MOF-based materials:Preparations and applications as electrodes in Li-ion batteries

引用

Journal of Energy Chemistry 2024年第10期97卷 388-418,I0008页

作者： Narges Nobakht Seyyed Ahmad Etghani Mohammad hosseini Seyed Hamed Aboutalebi Condensed Matter National Laboratory Institute for Research in Fundamental SciencesTehran 19395-5531Iran School of Biological Sciences Institute for Research in Fundamental SciencesTehran 19395-5746Iran BattScout Company London RoadBishopdownSalisbury SP13EnglandUnited Kingdom

Two-dimensional(2D)metal-organic frameworks(MOFs)are rapidly emerging as a unique class of mushrooming family of 2D materials offering distinctive features,such as hierarchical porosity,extensive surface area,easily available active sites,and versatile,adaptable *** promising characteristics have positioned them as highly appealing alternatives for a wide range of applications in energy storage technologies,including lithium ***,the poor conductivity and limited stability of 2D MOFs have limited their real applications in electrochemical energy *** limitations have therefore warranted ongoing research to enhance the performance of 2D *** the significance of 2D MOF-based materials as an emerging class of advanced materials,a multitude of strategy has been devised to address these challenges such as synthesizing 2D conductive MOFs and derivatives along with 2D MOF *** promising approach involves the use of 2D MOF derivatives,including transition metal oxides,which due to their abundant unsatu rated active metal sites and shorter diffusion paths,offer superior electrochemical ***,by combining pristine 2D MOFs with other materials,hybrid 2D MOF materials can be *** hybrids,with their enhanced stability and conductivity,can be directly utilized as active materials in lithium *** the present review,we categorize 2D MOF-based materials into three distinct groups:pristine 2D MOFs,2D MOFderived materials,and 2D MOF hybrid *** synthesis methods for each group,along with their specific applications as electrode materials in lithium-ion batteries,are discussed in *** comprehensive review provides insights into the potential of 2D MOFs while highlighting the opportunities and challenges that are present in this evolving field.

关键词： Li-ion batteries 2D materials 2D metal-organic frameworks Energy storage Synthesis

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

Experimental investigation of density current patterns using dynamic fractal analysis

引用

International Journal of Sediment Research 2021年第2期36卷 165-176页

作者： Mohammad hosseini Mohammad Hadi Fattahi Saeid Eslamian Department of Civil Engineering Najafabad Branch Islamic Azad University Department of Civil Engineering Marvdasht Branch Islamic Azad University Department of Water Engineering Isfahan University of Technology

Density currents are caused by a difference in density, though low, of an entering fluid with the ambient fluid. This type of current is two-phased and found on riverbeds or in reservoirs behind dams, and is nonlinear in nature, complex, and sensitive to initial conditions. Fractal geometry is used as a powerful tool for studying complex natural phenomena. Using experimental studies and changes in inlet current conditions, the fractal and multi-fractal analyses of the interface between the density current and the ambient fluid were done. In addition, a search was made to find a possible connection between the nonlinear patterns. According to the results, with an increase in the inlet discharge and inlet density of the current the fractal dimension decreased. Further, the smaller the range of the singularity spectrum diagram was, i.e., the more it was less than 0.34, the lower the system’s tendency was to be multi-fractal,and the system sensitive to large local changes. In the interface between the density current and the ambient fluid, using the fractal dimension-based Richardson number could improve experimental data by 12.4%. Moreover, with an increase in the Richardson number, the Reynolds number of the current decreased. Further, upon considering the fractal dimension, the Reynolds number improved by 23% and a good correlation with a coefficient of determination of 0.76.

关键词： Density current Fractal geometry Richardson number Multi-fractal analysis Fluid interface

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A Novel Distributed Optimal Adaptive Control Algorithm for Nonlinear Multi-Agent Differential Graphical Games

引用

IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 331-341页

作者： Majid Mazouchi Mohammad Bagher Naghibi-Sistani Seyed Kamal hosseini Sani Department of Electrical Engineering Ferdowsi University of Mashhad

In this paper, an online optimal distributed learning algorithm is proposed to solve leader-synchronization problem of nonlinear multi-agent differential graphical games. Each player approximates its optimal control policy using a single-network approximate dynamic programming(ADP) where only one critic neural network(NN) is employed instead of typical actorcritic structure composed of two NNs. The proposed distributed weight tuning laws for critic NNs guarantee stability in the sense of uniform ultimate boundedness(UUB) and convergence of control policies to the Nash equilibrium. In this paper, by introducing novel distributed local operators in weight tuning laws, there is no more requirement for initial stabilizing control policies. Furthermore, the overall closed-loop system stability is guaranteed by Lyapunov stability analysis. Finally, Simulation results show the effectiveness of the proposed algorithm.

关键词： Approximate dynamic programming(ADP) distributed control neural networks(NNs) nonlinear differentia graphical games optimal control

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

Strain Geometry and Vorticity Analysis of the Deformed Radiolarian Rocks in the Abade-Tashk Area,the Zagros Suture Zone,Iran

引用

Journal of Earth Science 2022年第2期33卷 525-540页

作者： Roghyeh Tavakkoli Khalil Sarkarinejad Saeede Keshavarz Seyed Rahim hosseini Department of Earth Sciences School of ScienceShiraz UniversityShiraz ***Iran Department of Earth Sciences Graduate University of Advanced TechnologyKerman ***Iran

Deformation in the Zagros suture zone is a result of the oblique collision of the AfroArabian continent with the Central Iranian *** types of folding and faulting are characteristic features of the study area and indicate the performance of a high strain tectonic regime in this *** distinguish deformation geometry during the collisional events,strain measurements have been carried out,using the R_(f)/φ method on deformed radiolarian microfossils,in the Zagros suture *** on the results,the strain ellipsoid shape is in the range of general flattening to plane strain(K=0.16 – 1.12).Measured mean kinematic vorticity number(W_(m)) in the deformed radiolarian rocks ranges between 0.50 and 0.87,which implies that exhumation of the Abade-Tashk area was facilitated by a general shear flow(35%

关键词： transpression Zagros suture zone deformed radiolarian microfossils vorticity analysis Abade-Tashk area tectonicstranspression Zagros suture zone deformed radiolarian microfossils vorticity analysis Abade-Tashk area tectonics

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

Assessment of electrostatic discharge sensitivity of nitrogen-rich heterocyclic energetic compounds and their salts as high energy-density dangerous compounds:A study of structural variables

引用

Defence Technology（防务技术） 2024年第9期39卷 15-22页

作者： Mohammad Hossein Keshavarz Sedigheh Heydari Bani Reza Bakhtiari Seyyed Hesamodin hosseini Faculty of Applied Sciences Malek Ashtar University of TechnologyIsfahan 177415875Iran

Nitrogen-rich heterocyclic energetic compounds(NRHECs)and their salts have witnessed widespread synthesis in recent *** substantial energy-density content within these compounds can lead to potentially dangerous explosive reactions when subjected to external stimuli such as electrical ***,developing a reliable model for predicting their electrostatic discharge sensitivity(ESD)becomes *** study proposes a novel and straightforward model based on the presence of specific groups(-NH_(2) or-NH-,-N=N^(+)-O^(-)and-NNO_(2),-ONO_(2) or-NO_(2))under certain conditions to assess the ESD of NRHECs and their salts,employing interpretable structural *** a comprehensive dataset comprising 54 ESD measurements of NRHECs and their salts,divided into 49/5 training/test sets,the model achieves promising *** Root Mean Square Error(RMSE),Mean Absolute Error(MAE),and Maximum Error for the training set are reported as 0.16 J,0.12 J,and 0.5 J,***,the ratios RMSE(training)/RMSE(test),MAE(training)/MAE(test),and Max Error(training)/Max Error(test)are all greater than 1.0,indicating the robust predictive capabilities of the *** presented model demonstrates its efficacy in providing a reliable assessment of ESD for the targeted NRHECs and their salts,without the need for intricate computer codes or expert involvement.

关键词： Electrostatic discharge sensitivity Heterocyclic energetic compounds containing azole compound Interpretable structural parameter Safety

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 Anxiolytic and Antidepressant Effect of Stachys Lavandulifolia in the Experimental Pentylenetetrazole-Induced Rat Model of Acute Seizure

引用

World Journal of Traditional Chinese Medicine 2024年第1期10卷 114-120页

作者： Vahid Azizi Farzin Allahyari Abdolkarim hosseini Department of Animal Sciences Faculty of Life Sciences and BiotechnologyShahid Beheshti UniversityTehranIran

Objective:In traditional medicine,Stachys lavandulifolia or mountain tea has been used in the treatment of arthritis and rheumatoid arthritis.A leaf extract from this plant is also thought to be effective in treating epilepsy as well as other neurological *** assess the effect of *** extract(SLE),rats were exposed to a stress and anxiety model caused by *** and Methods:A challenge dose of pentylenetetrazole(PTZ)(60 mg/kg)was used to induce seizures in male Wistar rats(200-250 g).Animal treated with an intraperitoneal injection of either SLE(50 mg/kg)or sodium valproate(100 mg/kg)alone or in combination 30 min before PTZ *** effect of stress and anxiety was assessed using an open field test(OFT),forced swim test(FST),and elevated plus maze(EPM).At the end of the experiment,anesthesia was used to euthanize rats,and their blood serum was collected for measurements of glutathione(GSH),malondialdehyde(MDA),and GSH peroxidase(GPx).Results:In contrast to the control group,those treated with PTZ exhibited depressive *** 50 mg/kg,SLE provided protection against seizures induced by *** also reduced seizure-induced stress and anxiety,significantly improving FST,EPM,and OFT compared with the PTZ-treated *** decreasing MDA levels and restoring the antioxidant enzymes GSH and GPx,SLE treatment protects against seizure-induced anxiety and ***:SLE inhibits oxidative stress damage and seizure-induced stress by inhibiting seizures'inhibitory effects.

关键词： Anxiety behavior depression oxidative stress traditional medicine

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

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：