检索结果-南通市图书馆

Severe asthma exacerbation:Changes in patient characteristics,management,and outcomes from 1997 to 2016 in 40 ICUs in the greater Paris area

引用

Journal of Intensive Medicine 2024年第2期4卷 209-215页

作者： Romy Younan Jean Loup Augy Bertrand Hermann Bertrand Guidet Philippe Aegerter Emmanuel Guerot Ana Novara Caroline Hauw-Berlemont amer hamdan Clotilde Bailleul Francesca Santi Jean-Luc Diehl Nicolas Peron Nadia Aissaoui Intensive Care Unit AP-HPGeorges Pompidou European HospitalUniversitéde ParisParisFrance Intensive Care Unit AP-HPSaint Antoine HospitalUniversités de SorbonneUniversitéPierre et Marie CurieParisFrance INSERM U1136 ParisFrance Versailles Saint-Quentin-en-Yvelines University INSERM U1018Groupe Interrégional de Recherche Clinique et d'InnovationÎle-de-FranceFrance Respiratory Medicine Department AP-HPGeorges Pompidou European HospitalUniversitéde ParisParisFrance Innovative Therapies in Hemostasis INSERM UMR-S1140Universitéde ParisParisFrance Intensive Care Unit and Biosurgical Research Lab(Carpentier Foundation) AP-HPGeorges Pompidou European HospitalParisFrance Paris-Cardiovascular-Research-Center INSERM U970ParisFrance

Background Despite advances in asthma treatments,severe asthma exacerbation(SAE)remains a life-threatening condition in adults,and there is a lack of data derived from adult patients admitted to intensive care units(ICUs)for *** current study investigated changes in adult patient characteristics,management,and outcomes of SAE over a 20-year period in 40 ICUs in the greater Paris *** In this retrospective observational study,admissions to 40 ICUs in the greater Paris area for SAE from January 1,1997,to December 31,2016 were *** primary outcome was the proportion of ICU admissions for SAE during 5-year *** outcomes were ICU and hospital mortality,and the use of mechanical ventilation and *** analysis was performed to assess factors associated with ICU *** A total of 7049 admissions for SAE were *** each 5-year period,the proportion decreased over time,with SAE accounting for 2.84%of total ICU admissions(n=2841)between 1997 and 2001,1.76%(n=1717)between 2002 and 2006,1.05%(n=965)between 2007 and 2011,and 1.05%(n=1526)between 2012 and *** median age was 46 years(interquartile range[IQR]:32–59 years),55.41%were female,the median Simplified Acute Physiology Score II was 20(IQR:13–28),and 19.76%had mechanical *** use of mechanical ventilation remained infrequent throughout the 20-year period,whereas the use of catecholamine *** and hospital mortality rates *** associated with ICU mortality were renal replacement therapy,catecholamine,cardiac arrest,pneumothorax,acute respiratory distress syndrome,sepsis,and invasive mechanical ventilation(IMV).Non-survivors were older,had more severe symptoms,and were more likely to have received *** ICU admission for SAE remains uncommon,and the proportion of cases decreased over *** a slight increase in symptom severity during a 20-year period,ICU and hospital mortality *** requirin

关键词： Epidemiology Intensive care unit Mechanical ventilation Severe asthma exacerbation

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

THIRD ORDER SHEAR DEFORMATION MODEL FOR LAMINATED SHELLS WITH FINITE ROTATIONS:FORMULATION AND CONSISTENT LINEARIZATION

引用

Acta Mechanica Sinica 2004年第5期20卷 484-498页

作者： Mohamed BALAH hamdan Naser AL-GHAMEDY Department of Information and Computer Science King Fahd University of Petroleum & MineralsDhahran 31261Saudi Arabia (Department of Civil Engineering King Fahd University of Petroleum & MineralsDhahran 31261Saudi Arabia

The paper presents an approach for the formulation of general laminated shells based on a third order shear deformation theory. These shells undergo finite (unlimited in size) rotations and large overall motions but with small strains. A singularity-free parametrization of the rotation field is adopted. The constitutive equations, derived with respect to laminate curvilinear coordinates, are applicable to shell elements with an arbitrary number of orthotropic layers and where the material principal axes can vary from layer to layer. A careful consideration of the consistent linearization procedure pertinent to the proposed parametrization of finite rotations leads to symmetric tangent stiffness matrices. The matrix formulation adopted here makes it possible to implement the present formulation within the framework of the finite element method as a straightforward task.

关键词： laminated shells third order shear deformation theory finite rotations consistent linearization

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

Sexual dimorphism of G protein-coupled receptor signaling in the brain

引用

Neural Regeneration Research 2024年第8期19卷 1635-1636页

作者： Sara Aljoudi hamdan hamdan Khaled S.Abd-Elrahman Department of Physiology and Immunology College of Medicine and Health SciencesKhalifa UniversityAbu DhabiUnited Arab Emirates Healthcare Engineering Innovation Center(HEIC) Khalifa UniversityAbu DhabiUnited Arab Emirates Department of Anesthesiology Pharmacology and Therapeuticsand Djavad Mowafaghian Center for Brain HealthUniversity of British ColumbiaVancouverBCCanada Department of Pharmacology and Therapeutics College of Medicine and Health ScienceKhalifa UniversityAbu DhabiUnited Arab Emirates Department of Pharmacology and Toxicology Faculty of PharmacyAlexandria UniversityAlexandriaEgypt

G protein-coupled receptors(GPCRs)represent the most substantial family of membrane receptors that are targeted by *** and Drug Administration-approved *** of the preclinical research to understand the pharmacology of... 详细信息

关键词： drugs clinical targeted

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

Fundamental Issues in Networked Control Systems

引用

IEEE/CAA Journal of Automatica Sinica 2018年第5期5卷 902-922页

作者： Magdi S.Mahmoud a Mutaz M.hamdan the systems engineering department king fahd university of petroleum and minerals

Abstract--This paper provides a survey on modeling and theories of networked control systems （NCS）. In the first part, modeling of the different types of imperfections that affect NCS is discussed. These imperfections are quantization errors, packet dropouts, variable sampling/transmission intervals, vari- able transmission delays, and communication constraints. Then follows in the second part a presentation of several theories that have been applied for controlling networked systems. These theories include： input delay system approach, Markovian system approach, switched system approach, stochastic system approach, impulsive system approach, and predictive control approach. In the last part, some advanced issues in NCS including decentral- ized and distributed NCS, cloud control system, and co-design of NCS are reviewed. Index Terms--Decentralized networked control systems （NCS）, distributed networked control systems, network constraints, net- worked control system, quantization, time delays.

关键词： Decentralized networked control systems(NCS) distributed networked control systems network constraints networked control system quantization time delays

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

Crack Propagation in Pipelines Under Extreme Conditions of Near-Neutral PH SCC

引用

Computers, Materials & Continua 2022年第12期73卷 5315-5329页

作者： Abdullah Alsit Mohammad Alkhedher Hasan hamdan Mechanical Engineering Department College of EngineeringAbu Dhabi UniversityAbu Dhabi59911United Arab Emirates

Stress Corrosion Cracking(SCC)process through which cracks occur in a variety of susceptible materials is a result of a combination of residual or applied stresses and *** oil and gas field,buried pipeline steels are made of low-alloy steels with a ferritic-pearlitic structure,such as *** dilute solutions,these materials are prone to SCC *** Near-neutral simulated soil solution(NS4)solution is established to imitate SCC conditions and subsequently became the industry requirement for crack growth experiments in the majority of *** strainassisted active crack pathways are considered while modelling SCC growth as an oxide film rupture and anodic dissolution ***’s been hypothesized that increasing the strain concentration can help with dissolution at the filmfree crack *** research focuses on estimating the SCC crack growth rate under various environmental conditions in oil and gas pipelines using finite element *** simulation is carried out using the J-integral theory in the COMSOL Multiphysics *** are performed to model the crack growth rate(CGR)using slip anodic dissolution(film rupture)*** plastic strain gradient is required to compute the SCC CGR(da/dt).Because the plastic strain located at crack tip increases proportionally to the crack length as it propagates,the CGR increases as the stress intensity factor(SIF)*** crack growth rates increase when constant loads are applied and as the temperature rises,and elevating the cathodic potential has a minimal influence on the propagation rate of cracks but raises the material yield strength and imparts brittle behavior to it.

关键词： Stress corrosion cracking SCC oxide film rupture and anodic dissolution crack growth rate CGR J-integral stress intensity factor SIF

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

Design of robust intelligent protection technique for large-scale grid-connected wind farm

引用

Protection and Control of Modern Power Systems 2018年第1期3卷 179-191页

作者： Omar Noureldeen I.hamdan Electrical Engineering Department Faculty of EngineeringSouth Valley UniversityQena 83523Egypt

This paper presents a design of robust intelligent protection technique using adaptive neuro-fuzzy inference system(ANFIS)approach to detect and classify the fault types during various faults occurrence in large-scale grid-connected wind ***,it is designed to determine the fault location and isolate the wind turbine generators located in the faulted zone during fault occurrence and reconnect them after fault *** studied wind farm has a total rating capacity of 120 MW,where it consists of 60 doubly fed induction generator(DFIG)wind turbines each has a capacity of 2 ***,the wind farm generators are positioned in 6 rows,where each row consists of 10 *** impacts of fault type,fault location,fault duration,cascaded faults,permanent fault and external grid fault on the behaviours of the generated active and reactive power are ***,the impacts of internal and external faults in cases of different transition resistances are *** simulation results indicate that,the proposed ANFIS protection technique has the ability to detect,classify and determine the fault location,then isolate the faulted zones during fault occurrence and reconnect them after fault ***,the wind turbines generators which are located in un-faulted zones can stay to deliver their generated active power to the grid during fault period.

关键词： ANFIS Fault location DFIG Wind farm Active power Reactive power

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

A novel controllable crowbar based on fault type protection technique for DFIG wind energy conversion system using adaptive neuro-fuzzy inference system

引用

Protection and Control of Modern Power Systems 2018年第1期3卷 337-348页

作者： Omar Noureldeen I.hamdan Department of Electrical Engineering Faculty of EngineeringSouth Valley UniversityQena 83523Egypt

This paper proposes a novel controllable crowbar based on fault type(CBFT)protection technique for doubly fed induction generator(DFIG)wind energy conversion system connected to *** studied system consists of six DFIG wind turbines with a capacity of 1.5 MW for each of *** operation mechanism of proposed technique is used to connect a set of crowbar resistors in different connection ways via activation of controllable circuit breakers(CBs)depending on the detected fault *** each phase of DFIG,a crowbar resistor is connected in parallel with a controllable CB and all of them are connected in series to grid *** adaptive neuro-fuzzy inference system(ANFIS)networks are designed to detect the fault occurrence,classify the fault type,activate the CBs for crowbar resistors associated with faulted phases during fault period,and deactivate them after fault *** effectiveness of proposed CBFT protection technique is investigated for different fault types such as symmetrical and unsymmetrical faults taking into account the single-phase to ground fault is the most frequently fault type that occurs in power ***,a comparison between the behaviours of studied system in cases of using traditional parallel rotor crowbar,classical outer crowbar,and proposed CBFT protection techniques is *** fluctuations of DC-link voltage,active power,and reactive power for studied system equipped with different protection techniques are ***,the impacts of different crowbar resistance values on the accuracy of proposed technique are *** simulation results show that,the proposed technique enhances the stability of studied wind turbine generators and contributes in protection of their components during faults.

关键词： ANFIS networks Crowbar Power electronic converters DFIG wind turbines Fault types

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

Synergy of remotely sensed data in spatiotemporal dynamic modeling of the crop and cover management factor

引用

Pedosphere 2022年第3期32卷 381-392页

作者： Pooja P.PREETHA Ashraf Z.AL-hamdan Department of Civil Engineering Alabama A&M University4900 Meridian Street NHuntsvilleAL 35811-7500(USA) Department of Civil and Environmental Engineering University of Alabama in Huntsville301 Sparkman DriveHuntsvilleAL 35899-7500(USA)

Soil erosion is a threat to the water quality constituents of sediments and nutrients and can cause long-term environmental *** important parameter to quantify the risk of soil loss from erosion is the crop and cover management factor(C-factor),which represents how cropping and management practices affect the rates and potential risk of soil *** developed remotely sensed data-driven models for dynamic predictions of C-factor by implementing dynamic land cover modeling using the SWAT(Soil and Water Assessment Tool)model on a watershed *** remotely sensed processed variables included the enhanced vegetation index(EVI),the fraction of photosynthetically active radiation absorbed by green vegetation(FPAR),leaf area index(LAI),soil available water content(AWC),slope gradient(SG),and ratio of area(AR)of every hydrologic response unit(HRU)to that of the total watershed,comprising unique land cover,soil type,and slope gradient characteristics within the Fish River catchment in Alabama,USA between 2001 and *** regressions,spatial trend analysis,correlation matrices,forward stepwise multivariable regression(FSMR),and 2-fold cross-validation were conducted to evaluate whether there were possible associations between the C-factor and EVI with the successive addition of remotely sensed environmental *** on the data analysis and modeling,we found a significant association between the C-factor and EVI with the synergy of the environmental factors FPAR,LAI,AWC,AR,and SG(predicted R^(2)(R^(2)_(pred))=0.51;R^(2)=0.68,n=3220,P<0.15).The results showed that the developed FSMR model constituting the non-conventional factors AWC(R^(2)_(pred)=0.32;R^(2)=0.48,n=3220,P<0.05)and FPAR(R^(2)_(pred)=0.13;R^(2)=0.28,n=3220,P=0.31)was an improved fit for the watershed *** conclusion,the union of dynamic variables related to vegetation(EVI,FPAR,and LAI),soil(AWC),and topography(AR and SG)can be utilized for spatiotemporal C-factor estimation and to mo

关键词： C-factor enhanced vegetation index land cover modeling remote sensing soil erosion soil moisture solar radiation

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

Email Filtering Using Hybrid Feature Selection Model

引用

Computer Modeling in Engineering & Sciences 2022年第8期132卷 435-450页

作者： Adel hamdan Mohammad Sami Smadi Tariq Alwada’n Computer Science Department The World Islamic Sciences and Education UniversityAmmanJordan Information System and Networks Department The World Islamic Sciences and Education UniversityAmmanJordan Network and Cybersecurity Department Teesside UniversityMiddlesbroughUK

Undoubtedly,spam is a serious problem,and the number of spam emails is increased ***,the massive number of spam emails prompts the need for spam detection *** methods and algorithms are used for spam ***,some emergent spam detection techniques use machine learning methods and feature *** methods and algorithms have been introduced for spam detecting and *** research proposes two models for spam detection and feature *** first model is evaluated with the email spam classification dataset,which is based on reducing the number of keywords to its *** results of this model are promising and highly *** second proposed model is based on creating features for spam detection as a first ***,the number of features is reduced using three well-known metaheuristic algorithms at the second *** algorithms used in the second model are Artificial Bee Colony(ABC),Ant Colony Optimization(ACO),and Particle Swarm Optimization(PSO),and these three algorithms are adapted to fit the proposed ***,the authors give it the names AABC,AACO,and APSO,*** dataset used for the evaluation of this model is ***,well-known criteria are used for the evaluation purposes of this model,such as true positive,false positive,false negative,precision,recall,and *** outcomes of the second proposed model are highly significant compared to the first one.

关键词： Feature selection artificial bee colony ant colony optimization particle swarm optimization spam detection emails filtering

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

Analysis of particulate behavior in porous media

引用

Applied Mathematics and Mechanics(English Edition) 2008年第4期29卷 511-516页

作者： Hani I.Siyyam M.H.hamdan Department of Mathematics and Physics College of Arts and SciencesQatar UniversityP.O.Box 2713DohaQatar Department of Mathematical Sciences University of New BrunswickP.O.Box 5050Saint JohnNew BrunswickCanada

In this work, we analyze the behavior of the particle phase in the flow of a particle-laden mixture through a porous medium. An attempt is made to model the diffusion and dispersion processes, and to quantify the devi... 详细信息

关键词： porous media dusty gases particle behavior

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：