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Application of Chebyshev theorem to data preparation in landslide susceptibility mapping studies:an example from Yenice(Karabük,Turkey)region

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Journal of Mountain Science 2016年第11期13卷 1923-1940页

作者： Murat ERCANOGLU Gülseren DAGDELENLER erman ozsayin Tolga ALKEVLI Harun SONMEZ N.Nur OZYURT Burcu KAHRAMAN Ibrahim UCAR Sinem CETINKAYA Hacettepe University Geological Engineering Department06800BeytepeAnkaraTurkey Gazi University Civil Engineering Department06500TeknikokullarAnkaraTurkey

Landslide database construction is one of the most crucial stages of the landslide susceptibility mapping *** there are many techniques for preparing landslide database in the literature,representative data selection from huge data sets is a challenging,and,to some extent,a subjective ***,in order to produce reliable landslide susceptibility maps,data-driven,objective and representative database construction is a very important stage for these *** study mainly focuses on a landslide database construction *** this study,it was aimed at building a representative landslide database extraction approach by using Chebyshev theorem to evaluate landslide susceptibility in a landslide prone area in the WesternBlack Sea region of *** study area was divided into two different parts such as training(Basin 1) and testing areas(Basin 2).A total of nine parameters such as topographical elevation,slope,aspect,planar and profile curvatures,stream power index,distance to drainage,normalized difference vegetation index and topographical wetness index were used in the ***,frequency distributions of the considered parameters in both landslide and nonlandslide areas were extracted using different sampling strategies,and a total of nine different landslide databases were *** these,eight databases were gathered by the methodology proposed by this study based on different standard deviations and algebraic multiplication of raster parameter *** evaluate landslide susceptibility,Artificial Neural Network method was used in thestudy area considering the different landslide and nonlandslide ***,to assess the performance of the so-produced landslide susceptibility map based on nine data sets,Area Under Curve(AUC approach was implemented both in Basin 1 and *** best performances(the greatest AUC values were gathered by the landslide susceptibility map produced by two standard deviation databas extracted by the Chebyshev theore

关键词：人工的神经网络 Chebyshev 定理山崩山崩数据库印射的山崩危险性

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Mechanically Joined Extrusion Profiles for Battery Trays

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Automotive Innovation 2024年第1期7卷 182-193页

作者： Florian Kneuper Stefan Neumann AndréSchulze Mortaza Otroshi A.erman Tekkaya Gerson Meschut Institute of Forming Technology and Lightweight Components(IUL) TU Dortmund University44227 DortmundGermany Laboratory for Material and Joining Technology(LWF) Paderborn UniversityPaderbornGermany

In the context of electromobility,ensuring the leak tightness of assemblies is of paramount importance,particularly in bat-tery *** battery housings,often featuring base assemblies crafted from extruded aluminum profiles,address the challenge of leak tightness at joints through methods like friction stir welding,a process known for its time and cost *** aim of this study is to develop and implement a new type of extruded profile concept to produce tight base assemblies for battery housings by a longitudinal mechanical single stroke joining *** geometry,the process and the properties of the aluminum profiles are investigated to get a joint that meets the tightness requirements and achieve high load-bearing capacities in agreement with the high homologation requirements set to vehicles with high-voltage *** joint is formed by means of a single stage press stroke,which eliminates the need for complex tool designs that are neces-sary for continuous joining(roll joining).Flat steel contact surfaces are used as joining *** evaluate the joint quality,force curves from the joining process are analyzed and the resulting joint geometries are assessed using *** resulting leak tightness of the linear joints is measured by a helium sniffer leak detector and the load-bearing capacities are investigated by shear lap and bending tests and fatigue strength *** study also explores whether a difference in strength between the two joining partners has a positive effect on the joint properties.

关键词： Joining by plastic deformation Aluminum Leak Tightness

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The mediating roles of loneliness at work and burnout in the relationshipbetween career adaptability,organizational commitment,and job satisfactionamong teachers

Journal of Social Science Development Research

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Journal of Social Science Development Research 2024年第1期2卷 87-102页

作者： Ahmet Karal erman Kayisdag Hafiz Bek Kastamonu University KastamonuTürkiye Eskisehir Osmangazi University EskisehirTürkiye Usak University UsakTürkiye.

This research examines the mediating roles of loneliness at work and burnout in the relationship between career adaptability,organizational commitment,andjob satisfaction among *** analysis was conducted with 256 *** were collected with the Organizational Commitment Scale,CareerAdaptabilities Scale,Loneliness at Work Scale,Burnout Measure,and Job Satisfaction *** were analyzed with a two-stage structural equationmodeling *** to the research findings,it has been proven that the mediatory effects of loneliness at work and burnout are significant in therelationship between organizational commitment and job satisfaction.

关键词： Loneliness at work Career adaptability Organizational commitment

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Comparative Analysis of Statistical Thickness Models for the Determination of the External Specific Surface and the Surface of the Micropores of Materials: The Case of a Clay Concrete Stabilized Using Sugar Cane Molasses

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Geomaterials 2024年第2期14卷 13-28页

作者： Nice Mfoutou Ngouallat Narcisse Malanda Christ Ariel Ceti Malanda Kris Berjovie Maniongui erman Eloge Nzaba Madila Paul Louzolo-Kimbembe Mechanics Energy and Engineering Laboratory Higher National Polytechnic School Marien Ngouabi University Brazzaville Republic of the Congo National Institute for Research in Engineering Sciences Innovation and Technology (INRSIIT) Brazzaville Republic of the Congo Higher Institute of Architecture Building Planning and Public Works Denis SASSOU N&#8217GUESSO University Kint&#233l&#233 Republic of the Congo Hydrogen Research Institute University of Quebec in Trois Rivieres Quebec Canada Superior Normal School (ENS) Marien Ngouabi University Brazzaville Republic of the Congo

In this work, four empirical models of statistical thickness, namely the models of Harkins and Jura, Hasley, Carbon Black and Jaroniec, were compared in order to determine the textural properties (external surface and surface of micropores) of a clay concrete without molasses and clay concretes stabilized with 8%, 12% and 16% molasses. The results obtained show that Hasley’s model can be used to obtain the external surfaces. However, it does not allow the surface of the micropores to be obtained, and is not suitable for the case of simple clay concrete (without molasses) and for clay concretes stabilized with molasses. The Carbon Black, Jaroniec and Harkins and Jura models can be used for clay concrete and stabilized clay concrete. However, the Carbon Black model is the most relevant for clay concrete and the Harkins and Jura model is for molasses-stabilized clay concrete. These last two models augur well for future research.

关键词： Statistical Thickness Model External Specific Surface Microporous Surface Clay Concrete Molasses

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潮流作用下环礁断面的流动特征研究

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海洋通报 2024年第3期43卷 312-320页

作者：旷敏姚宇彭尔曼长沙理工大学水利与环境工程学院湖南长沙410114 水沙科学与水灾害防治湖南省重点实验室湖南长沙410114

本文首先通过循环水槽试验测量分析了正向和反向潮流影响下概化环礁断面的流动特性,试验结果表明:在正向流和反向流作用时,礁坪上仅存在亚临界流,并可观察到经典的壁面有界流动流速剖面特征;沿礁的平均水位与各个测线上的流速随潮流幅... 详细信息

本文首先通过循环水槽试验测量分析了正向和反向潮流影响下概化环礁断面的流动特性,试验结果表明:在正向流和反向流作用时,礁坪上仅存在亚临界流,并可观察到经典的壁面有界流动流速剖面特征;沿礁的平均水位与各个测线上的流速随潮流幅值的增大而增大。本文随后采用雷诺平均的Navier-Stokes方程并结合标准的k-ωSST湍流模型建立数值水槽,进一步研究了多种水动力与礁型因素影响下前后礁外礁缘处的流速变化规律。数值模拟结果表明:后礁外礁缘处的平均流速均大于前礁外礁缘处;平均流速随潮流幅值的增大而增大,随礁坪水深、礁坪宽度、潟湖宽度和礁前斜坡坡度的增大而减小;最后基于数值模拟结果提出了预测各种因素影响下前后礁外礁缘处流速的幂函数型经验公式。

关键词：珊瑚环礁潮流流动特性基于雷诺平均的Navier-Stokes方程

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微课教育联合生活指导在幼儿生长发育及营养喂养中的应用

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中国医药指南 2024年第2期22卷 98-100页

作者：蒋珥蔓厦门市集美区海怡实验幼儿园卫生站厦门361000

目的分析微课教育联合生活指导在幼儿生长发育及营养喂养中的应用效果。方法选取2021年2月到2022年3月期间厦门市集美区海怡实验幼儿园卫生站收治的140例幼儿为研究对象,随机分入观察组(70例)和对照组(70例),对对照组幼儿及其家长采用... 详细信息

目的分析微课教育联合生活指导在幼儿生长发育及营养喂养中的应用效果。方法选取2021年2月到2022年3月期间厦门市集美区海怡实验幼儿园卫生站收治的140例幼儿为研究对象,随机分入观察组(70例)和对照组(70例),对对照组幼儿及其家长采用常规护理,对观察组幼儿及其家长采用微课教育联合生活指导,比较两组干预前后幼儿生长发育(体重增长、身长增长)、营养生化(血清前白蛋白、肌酐、血清钙)指标水平以及营养喂养耐受情况。结果护理后观察组幼儿体重、身长增长等生长发育指标水平和血清前白蛋白、肌酐、血清钙营养生化指标水平情况均优于对照组(均P<0.05),观察组营养喂养不耐受占比低于对照组(P<0.05)。结论微课教育联合生活指导在幼儿生长发育及营养喂养中效果良好,可提高幼儿喂养耐受性,改善机体营养指标,促进幼儿生长发育。

关键词：微课教育生活指导幼儿生长发育营养喂养

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波流共同作用下珊瑚礁海岸水动力特性数值模拟研究

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热带海洋学报 2024年第3期43卷 187-194页

作者：彭尔曼姚宇李壮志许从昊长沙理工大学水利与环境工程学院湖南长沙410114 水沙科学与水灾害防治湖南省重点实验室湖南长沙410114

为研究波流共同作用下珊瑚礁海岸附近水动力特性,本文基于雷诺平均的Navier-Stokes方程(Reynolds-averaged Navier-Stokes equations,RANS)建立了2维数值波流水槽,分别采用k-ωSST湍流模型模拟湍流和流体体积法(volume of fluid,VOF)追... 详细信息

为研究波流共同作用下珊瑚礁海岸附近水动力特性,本文基于雷诺平均的Navier-Stokes方程(Reynolds-averaged Navier-Stokes equations,RANS)建立了2维数值波流水槽,分别采用k-ωSST湍流模型模拟湍流和流体体积法(volume of fluid,VOF)追踪自由液面。模拟定常正向流和反向流,并与只考虑波浪的情形进行对比,重点分析了水流对沿礁波高、平均水位以及破碎带附近波生流、湍动能和雷诺剪切应力的影响。结果表明,相对于纯波浪的情况,正向流使礁坪波高和增水减小,反向流使礁坪波高和增水增大,增减幅度随水流流量的增加而增大,正向流影响下破碎带附近沿水深方向整个水体均为向岸流,反向流影响下破碎带附近波谷上方为向岸流下方为离岸流,波谷下方水流强度均随着流量的增加而增大;破碎带附近的湍动能和雷诺剪切应力的随着正向流流量的增加而减小,随着反向流流量的增加而增大。

关键词：背景水流破碎带 Navier-Stokes方程珊瑚礁

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梁山县大型灌区农业水价综合改革做法及建议

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山东水利 2024年第3期 77-79页

作者：陈浩丰尔蔓张芳素济宁市水利事业发展中心山东济宁272000

阐述了梁山县两处大型灌区在实施农业水价综合改革过程中,采取核定水价、分解水权水量、制定奖补机制、加强灌区管护等相关措施,取得了一定成效,同时分析了当前存在问题与短板,提出了相应的改进措施,为下一步持续深化改革提供了思路。

关键词：梁山县灌区水价改革农业灌溉

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Hybrid Additive Manufacturing of Forming Tools

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Automotive Innovation 2023年第3期6卷 311-323页

作者： Hamed Dardaei Joghan Ramona Holker‑Jager Anna Komodromos A.erman Tekkaya Institute of Forming Technology and Lightweight Components(IUL) TU Dortmund UniversityBaroper Stra.e 30344227 DortmundGermany

Additive manufacturing(AM)is widely used in the automotive industry and has been expanded to include aerospace,marine,and *** flexibility and the possibility of manufacturing complex parts in AM motivate the integration of additive manu-facturing with classical forming technologies,which can improve tooling concepts and reduce *** study presents three applications of this ***,the possibility of successful utilization of selective laser melting for manufacturing extrusion tools with complex cooling channels and paths for thermocouples is reported,leading to significantly reduced inner die temperatures during the extrusion ***,sheet lamination is integrated with laser metal deposition(LMD)to manufacture deep-drawing *** results are achieved in reducing the stair step effect,which is the main challenge in sheet lamination,by LMD and following post-processing such as milling,ball burnishing,and laser *** new manufacturing route shows that LMD can economically and efficiently reduce the stair step effect and omit the hardening step from the conventional manufacturing process ***,LMD is used to manufacture a hot stamping punch with improved surface roughness by ball burnishing and near-surface complex cooling *** experimental results show that the manufactured punch has lower temperatures during hot stamping compared with the conventionally manufactured *** study shows the successful integration of AM processes with classical forming processes.

关键词： Additive manufacturing Laser metal deposition Selective laser melting Rapid tooling Forming tool Layer laminated manufacturing

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Soft Sensors for Property‑Controlled Multi‑Stage Press Hardening of 22MnB5

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Automotive Innovation 2023年第3期6卷 352-363页

作者： Juri Martschin Malte Wrobel Joshua Grodotzki Thomas Meurer A.erman Tekkaya Institute of Forming Technology and Lightweight Components TU Dortmund UniversityBaroper Str.30344227 DortmundGermany Institute of Mechanical Process Engineering and Mechanics Karlsruhe Institute of Technology(KIT)Hertzstr.1676187 KarlsruheGermany

In multi-stage press hardening,the product properties are determined by the thermo-mechanical history during the sequence of heat treatment and forming *** measure these properties and finally to control them by feedback,two soft sensors are developed in this *** press hardening of 22MnB5 sheet material in a progressive die,where the material is first rapidly austenitized,then pre-cooled,stretch-formed,and finally die bent,serves as the framework for the development of these *** provide feedback on the temporal and spatial temperature distribution,a soft sensor based on a model derived from the Dynamic mode decomposition(DMD)is *** model is extended to a parametric DMD and combined with a Kalman filter to estimate the temperature(-distribution)as a function of all process-relevant control *** soft sensor can estimate the temperature distribution based on local thermocouple measurements with an error of less than 10°C during the process-relevant time *** the online prediction of the final microstructure,an artificial neural network(ANN)-based microstructure soft sensor is *** part of this,a transferable framework for deriving input parameters for the ANN based on the process route in multi-stage press hardening is presented,along with a method for developing a training database using a 1-element model implemented with LS-Dyna and utilizing the material model Mat248(PHS_BMW).The developed ANN-based microstructure soft sensor can predict the final microstructure for specific regions of the formed and hardened sheet in a time span of far less than 1 s with a maximum deviation of a phase fraction of 1.8%to a reference simulation.

关键词： Press hardening Property control Soft sensor Artificial neuronal network Dynamic mode decomposition

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