检索结果-南通市图书馆

Machine learning model for snow depth estimation using a multisensory ubiquitous platform

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2022年第9期19卷 2506-2527页

作者： Sofeem NASIM mourad OUSSALAH Björn KLÖVE Ali Torabi HAGHIGHI Department of Computer Science and Engineering University of OuluOulu 90570Finland Water Energy and Environmental EngineeringUniversity of OuluOulu 90570Finland

Snow depth estimation is an important parameter that guides several hydrological applications and climate change *** advances in remote sensing technology and enhanced satellite observations,the estimation of snow depth at local scale still requires improved accuracy and *** advances in ubiquitous and wearable technology promote new prospects in tackling this *** this paper,a wearable IoT platform that exploits pressure and acoustic sensor readings to estimate and classify snow depth classes using some machine-learning models have been put ***,the results of Random Forest classifier showed an accuracy of 94%,indicating a promising alternative in snow depth measurement compared to in situ,LiDAR,or expensive large-scale wireless sensor network,which may foster the development of further affordable ecological monitoring systems based on cheap ubiquitous sensors.

关键词： Snow depth Wearable technology Machine learning Random forest classifier

Fake News Classification: Past, Current, and Future

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第11期77卷 2225-2249页

作者： Muhammad Usman Ghani Khan Abid Mehmood mourad Elhadef Shehzad Ashraf Chaudhry Department of Computer Science University of Engineering and TechnologyLahore54890Pakistan Department of Computer Science&Information Technology Abu Dhabi UniversityAbu Dhabi59911United Arab Emirates Department of Software Engineering Faculty of Engineering and ArchitectureNisantasi UniversityIstanbulTurkey

The proliferation of deluding data such as fake news and phony audits on news web journals,online publications,and internet business apps has been aided by the availability of the web,cell phones,and social *** can quickly fabricate comments and news on social *** most difficult challenge is determining which news is real or ***,tracking down programmed techniques to recognize fake news online is *** an emphasis on false news,this study presents the evolution of artificial intelligence techniques for detecting spurious social media *** study shows past,current,and possible methods that can be used in the future for fake news *** different publicly available datasets containing political news are utilized for performing *** supervised learning algorithms are used,and their results show that conventional Machine Learning(ML)algorithms that were used in the past perform better on shorter text *** contrast,the currently used Recurrent Neural Network(RNN)and transformer-based algorithms perform better on longer ***,a brief comparison of all these techniques is provided,and it concluded that transformers have the potential to revolutionize Natural Language Processing(NLP)methods in the near future.

关键词： Supervised learning algorithms fake news classification online disinformation transformers recurrent neural network(RNN)disinformation transformers recurrent neural network(RNN)

Mixed Convection of Bingham Fluid in a Two Sided Lid-Driven Cavity Heated From Below

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2019年第2期15卷 107-123页

作者： Toufik Benmalek Ferhat Souidi mourad Moderres Bilal Yassad Said Abboudi Laboratoire de mécanique des fluides théorique et appliqué USTHBB.P.32El-AliaBab-Ezzouar16111 AlgerAlgérie Laboratory of Industrial Fluids Measurements and Applications(FIMA)UDBKM44225Ain DeflaAlgeria Laboratoire M3MUTBM 90010 Belfort CedexFrance

This study aims to analyze mixed convection in a square cavity with two moving vertical walls by finite volume *** cavity filled with Non-Newtonian fluid of Bingham model is heated from below and cooled by the other *** study has been conducted for certain parameters of Reynolds number(Re=1-100),Richardson number(Ri=1-20),Prandtl number(Pr=1-500),and Bingham number has been studied from 0 to *** results indicate that the increase in yield stress drops the heat transfer and the flow become flatter,while increasing Reynolds number augments *** convective transport is dominant when increasing Richardson number which leads to enhance heat transfer in the cavity for both Newtonian and Non-Newtonian fluid.A correlation of Nusselt number is given in function of different parameters.

关键词： Mixed convection heat transfer Bingham fluid lid-driven cavity

Application of fuzzy logic control algorithm as stator power controller of a grid-connected doubly-fed induction generator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2013年第1期7卷 49-55页

作者： Ridha CHEIKH Arezki MENACER Said DRID mourad TIAR LGEB Laboratory Department of Electrical Engineering Biskra University Biskra 07000 Algeria LSPIE Laboratory Department of Propulsion-Induction Electromagnetic Electrical Engineering University of Bama Batna 05000 Algeria

This paper discusses the power outputs control of a grid-connected doubly-fed induction generator （DFIG） for a wind power generation systems. The DFIG structure control has a six diode rectifier and a PWM IGBT converter in order to control the power outputs of the DFIG driven by wind turbine. So, to supply commercially the electrical power to the grid without any problems related to power quality, the active and reactive powers （Ps, Qs） at the stator side of the DFIG are strictly controlled at a required level, which, in this paper, is realized with an optimized fuzzy logic controller based on the grid flux oriented control, which gives an optimal operation of the DFIG in sub-synchronous region, and the control of the stator power flow with the possibility of keeping stator power factor at a unity.

关键词： doubly-fed induction generator (DFIG) vector control fuzzy logic controller optimization power factor unity active and reactive power

Aetiology and risk factors of ischaemic cholangiopathy after liver transplantation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第20期20卷 6159-6169页

作者： Moustafa Mabrouk mourad Abdullah Algarni Christos Liossis Simon R Bramhall Liver Unit Queen Elizabeth Hospital Birmingham B15 2TH United Kingdom

Liver transplantation (LT) is the best treatment for end-stage hepatic failure, with an excellent survival rates over the last decade. Biliary complications after LT pose a major challenge especially with the increasing number of procured organs after circulatory death. Ischaemic cholangiopathy (IC) is a set of disorders characterized by multiple diffuse strictures affecting the graft biliary system in the absence of hepatic artery thrombosis or stenosis. It commonly presents with cholestasis and cholangitis resulting in higher readmission rates, longer length of stay, repeated therapeutic interventions, and eventually re-transplantation with consequent effects on the patient’s quality of life and increased health care costs. The pathogenesis of IC is unclear and exhibits a higher prevalence with prolonged ischaemia time, donation after circulatory death (DCD), rejection, and cytomegalovirus infection. The majority of IC occurs within 12 mo after LT. Prolonged warm ischaemic times predispose to a profound injury with a subsequently higher prevalence of IC. Biliary complications and IC rates are between 16% and 29% in DCD grafts compared to between 3% and 17% in donation after brain death (DBD) grafts. The majority of ischaemic biliary lesions occur within 30 d in DCD compared to 90 d in DBD grafts following transplantation. However, there are many other risk factors for IC that should be considered. The benefits of DCD in expanding the donor pool are hindered by the higher incidence of IC with increased rates of re-transplantation. Careful donor selection and procurement might help to optimize the utilization of DCD grafts.

关键词： Ischaemic cholangiopathy Biliary complications Orthotopic liver transplantation Donation after circulatory death Reperfusion injury Cold ischaemia time

Efficiency and degradation products elucidation of the photodegradation of mefenpyrdiethyl in water interface using TiO_2 P-25 and Hombikat UV100

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第9期24卷 1686-1693页

作者： Amina Chnirheb mourad Harir Basem Kanawati Mohammed El Azzouzi Istvan Gebefgi Philippe Schmitt-Kopplin Department of BioGeoChemistry and Analytik German Research Center for Environmental HealthHelmholtz Center MunichIngoldstdter Landstraβe 1D-85764 NeuherbergGermany University Mohammed V-Agdal Faculty of SciencesAvenue Ibn BatoutaBP 1014 RabatMorocco. Lehrstuhl fr Chemische-Technische Analyse und Chemische Lebensmitteltechnologie Technische Universitt MuenchenWeihenstephaner Steig 2385354 Freising-WeihenstephanGermany

The photodegradation of mefenpyrdiethyl （MFD）, an herbicide safener, was investigated in aqueous suspensions by using Degussa P-25 and Hombikat UV100 titanium oxide under simulated sunlight irradiation. The effects of initial concentration of the herbicide, pH, catalysts and hydrogen peroxide doses as well as their combinations were studied and optimized. Accordingly, the kinetic parameters were determined and the effectiveness of the processes was assessed by calculating the rate constants. A pseudo first-order kinetics was observed. Under experimental conditions, the degradation rate constants were strongly influenced using P-25 and no noticeable effect was observed for Hombikat UV100. DFT calculations with B3LYP/6-311＋G（2d,p）//B3LYP/6-31＋G（d,p） level of theory were performed to check whether significant conformational changes occur when the charge state of the MFD substrate changes and whether these changes could play a role in the dependency of photodegradation rate constant on the studied pH. High resolution mass spectrometry （FT-ICR/MS） was implemented to identify the main degradation products.

关键词： photodegradation mefenpyrdiethyl P-25/Hombikat UV100 kinetic degradation products

Physical modeling and visualization of soil liquefaction under high confining stress

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2005年第1期4卷 47-57页

作者： Lenart González Tarek Abdoun mourad Zeghal Vivian Kallou Michael K.Sharp Dept.of Civil and Environmental Engineering Rensselaer Polytechnic Inst.(RPI)TroyNYUSA Mueser Rutledge Consulting Engineers 225 W 34th StreetNew YorkNYUSA US Army Engineer Research and Development Center VicksburgMSUSA

The mechanisms of seismically-induced liquefaction of granular soils underhigh confining stresses are still not fully *** of these mechanisms is generallybased on extrapolation of observed behavior at shallow *** centrifuge model tests wereconducted at RPI's experimental facility to investigate the effects of confining stresses on thedynamic response of a deep horizontal deposit of saturated *** was observed at highconfining stresses in each of the tests.A system identification procedure was used to estimate theassociated shear strain and stress time *** histories revealed a response marked byshear strength degradation and dilative *** recorded accelerations and pore pressures wereemployed to generate visual animations of the *** visualizations revealed a liquefactionfront traveling downward and leading to large shear strains and isolation of upper soil layers.

关键词： centrifuge modeling high confining stress liquefaction system identification visualization

Composition and antimicrobial activity of Cistus munbyi essential oil: an endemic plant from Algeria

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2017年第6期28卷 1127-1132页

作者： Fethi Benbelaid abdelmounaim Khadir mourad Bendahou Mohamed Amine Abdoune Alain Muselli Jean Costa Laboratory of Applied Microbiology in Food Biomedical and Environment Aboubekr Belkad UniversityP.O. Box 119 13000 Tlemcen Algeria Department of Biology University of Oran 1 Ahmed Ben Bella Es Senia Oran Algeria Laboratory of Natural Products Chemistry University of Corsica UMR CNRS 6134 Campus Grimaldi BP 5220250 Corte France Department of Biology Faculty of Sciences of Nature LifeEarth and Universe Aboubekr Belkad UniversityP.O. Box 119 13000 Tlemcen Algeria

The chemical composition and antimicrobial potential of Cistus munbyi essential oil were studied for the first time. GC and GC–MS analysis revealed 48 compounds representing 96.98% of the oil. Terpinen-4-ol(23.75%), meta-Cymene(17.30%), and Sabinene(12.38%)were the major constituents. Antimicrobial activity was evaluated against nine pathogens using the disc diffusion and broth micro-dilution methods. Results show that *** essential oil possesses strong antimicrobial activity against all strains, regardless if Gram-positive or Gramnegative bacteria, or yeast, with MICs values not exceeding10(mg/ml). In addition to its efficacy, C. munbyi essential oil has an unusual antimicrobial potency which is attributed to its specific chemical composition. Thus, findings presented here suggest that endemic C. munbyi contains a very interesting essential oil that may be valuable in several areas.

关键词： Antimicrobial activity Chemical composition Cistus munbyi Essential oil

Atorvastatin-induced severe gastric ulceration: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第20期11卷 3159-3160页

作者： Ihab I El-Hajj Fadi H mourad Nina S Shabb Kassem A Barada Department of Internal Medicine American University of Beirut Medical Center(AUBMC) Beirut Lebanon Department of Pathology AUBMC Beirut Lebanon

A 41-year-old man presented with severe gastric ulceration 3 mo after beginning treatment with atorvastatin 20 mg once daily for hypercholesterolemia. The patient was not taking any ulcerogenic drugs and had no evidence of Helicobacter pylori infection. Proton pump inhibitor therapy was initiated and atorvastatin was replaced by simvastatin with complete resolution of gastrointestinal symptoms. To our knowledge, this is the first report of atorvastatin-induced gastric ulceration,which should be looked for in patients who develop abdominal pain while on this drug.

关键词： Atorvastatin Drug toxicity Gastric ulceration