检索结果-南通市图书馆

Investigation of the fluid flow in an isolated rotor-stator system with a peripheral opening

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第4期56卷 745-754页

作者： DEBUCHY Roger ABDEL nour Fadi NAJI Hassane BOIS Gérard Laboratoire Génie Civil & géo-Environnement (LGCgE- EA 4515) UArtois/FSA Béthune F-62400 Béthune France Université Lille Nord de France F-59000 Lille France Damascus University Department of Water Engineering Damascus Syria LML-PRES Lille Nord de France Arts et Métiers ParisTech Lille France

This paper deals with an experimental, theoretical and numerical study of a turbulent flow with separated boundary layers between a rotor and a stator. The system is not subjected to any superimposed radial flow. The periphery of the cavity is opened to the atmosphere so that the solid body rotation for infinite discs is not always observed. Emphasis was placed on develop- ment of an asymptotic approach and a step-by-step method to compute the radial distribution of the core swirl ratio and the static pressure on the stator side. The theory also includes the radial and axial velocities in the core region. The numerical simulation has been conducted with the commercial CFD code Fluent 6.1. The k- SST turbulence model is used, with the assumption of 2D-axisymmetric and steady flow. CFD validations have been performed by comparison of the numerical results with the corresponding theoretical results. Numerical and experimental results are in good agreement with analytical solutions.

关键词： rotor-stator cavity analytical solution numerical simulations k- SST turbulence model

Impact of the COVID-19 pandemic on healthcare workers’families

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

World Journal of Clinical Cases 2022年第27期10卷 9964-9966页

作者： Mariana Helou nour El Osta Rola Husni Department of Emergency Medicine Lebanese American University school of MedicineBeirutLebanon Lebanese American University-Rizk Hospital BeirutLebanon Department of Emergency Lebanese American University School of MedicineBeirutLebanon Department of Infectious Diseases Lebanese American University School of MedicineBeirutLebanon

The coronavirus disease 2019 pandemic had a significant effect on the mental health,social lives,and family relationships of healthcare *** the pandemic,these workers had to prioritize their work over parenting,spending time with their kids or partners,planning weddings,and childbearing ***,special recognition should be given to the families of these employees.

关键词： Healthcare COVID-19 Relationship Pandemic Emergency Mental health

The cellular microenvironment and cytoskeletal actin dynamics in liver fibrogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2022年第9期46卷 2003-2007页

作者： nour HIJAZI DON C.ROCKEY ZENGDUN SHI Medical University of South Carolina Charleston29425USA

Hepatic stellate cells(HSCs)are the primary effector cells in liver *** the normal liver,HSCs serve as the primary vitamin A storage cells in the body and retain a“quiescent”***,after liver injury,they transdifferentiate to an“activated”myofibroblast-like phenotype,which is associated with dramatic upregulation of smooth muscle specific actin and extracellular matrix *** result is a fibrotic,stiff,and dysfunctional ***,understanding the molecular mechanisms that govern HSC function is essential for the development of anti-fibrotic *** actin cytoskeleton has emerged as a key component of the fibrogenic response in wound *** data indicate that the cytoskeleton receives signals from the cellular microenvironment and translates them to cellular function—in particular,increased type I collagen *** in nature,the actin cytoskeleton continuously polymerizes and depolymerizes in response to changes in the cellular *** this viewpoint,we discuss the recent developments underlying cytoskeletal actin dynamics in liver fibrosis,including how the cellular microenvironment affects HSC function and the molecular mechanisms that regulate the actininduced increase in collagen expression typical of activated HSCs.

关键词： Extracellular matrix Actin dynamics Transcriptional regulation Signaling

Molecular typing of methicillin and vancomycin-resistant Staphylococcus aureus isolated from clinical specimens by double locus sequence typing(DLST)method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2020年第3期44卷 411-419页

作者： SOHEILA HASANIAN nour AMIRMOZAFARI AHMAD FARAJZADEH SHEIKH IRAJ MEHREGAN Department of Biology Science and Research BranchIslamic Azad UniversityTehranIran Department of Microbiology School of MedicineIran University of Medical SciencesTehranIran Department of Microbiology School of MedicineAhvaz Jundishapur University of Medical SciencesAhvazIran

Methicillin-resistant Staphylococcus aureus(MRSA)strains are the essential cause of infections in communities and *** present study was conducted to determine the molecular typing of MRSA,isolated from hospitalized patients,using the double-locus sequence typing(DLST).In total,280 *** isolated from clinical specimens by phenotypic(catalase,coagulase,DNase,oxacillin,vancomycin screening agar and antibiotic disk diffusion),and molecular methods(PCR for determining the mecA,vanA and nuc genes).The DLST and sequencing was performed for MRSA containing *** of 280 specimens,confirmed as Staphylococcus aureus(***),123(43.9%)strains were *** highest resistance toward the erythromycin(15μg),followed by ciprofloxacin(5μg),clindamycin(2μg),tetracycline(30μg),gentamicin(10μg)and rifampicin(5μg),was 98.3%,97.5%,94.3%,90.2%,83.7%and 41.4%,***,the least resistance(0%)was observed in each of teicoplanin(30μg),linzolide(30μg),and vancomycin(30μg).All(100%)of MRSA strains had the mecA,and none of them have had the *** results of DLST showed that the most common sequence types were BPH 2003 and *** DLST type 18-32 was a significant cluster of *** sequencing MRSA and comparing the dominant types via the DLST,it is possible to establish the etiology of the disease in a much shorter time,and prevent the complications of the ***,the combination of partial sequences of clfB and spa can serve as useful genetic markers for MRSA *** concluded that the MRSA in our region was relatively high,but no vancomycin resistance was *** majority of the MRSA DLST type was 18–32.

关键词： Antibiotic resistance DLST MRSA Staphylococcus aureus

Enhancing IoT anomaly detection performance for federated learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2022年第3期8卷 314-323页

作者： Brett Weinger Jinoh Kim Alex Sim Makiya Nakashima nour Moustafa K.John Wu Stony Brook University Stony BrookNYUSA Lawrence Berkeley National Laboratory BerkeleyCAUSA Texas A&M University CommerceTXUSA University of New South Wales CanberraAustralia

Federated Learning (FL) with mobile computing and the Internet of Things (IoT) is an effective cooperative learning approach. However, several technical challenges still need to be addressed. For instance, dividing the training process among several devices may impact the performance of Machine Learning (ML) algorithms, often significantly degrading prediction accuracy compared to centralized learning. One of the primary reasons for such performance degradation is that each device can access only a small fraction of data (that it generates), which limits the efficacy of the local ML model constructed on that device. The performance degradation could be exacerbated when the participating devices produce different classes of events, which is known as the class balance problem. Moreover, if the participating devices are of different types, each device may never observe the same types of events, which leads to the device heterogeneity problem. In this study, we investigate how data augmentation can be applied to address these challenges and improving detection performance in an anomaly detection task using IoT datasets. Our extensive experimental results with three publicly accessible IoT datasets show the performance improvement of up to 22.9% with the approach of data augmentation, compared to the baseline (without relying on data augmentation). In particular, stratified random sampling and uniform random sampling show the best improvement in detection performance with only a modest increase in computation time, whereas the data augmentation scheme using Generative Adversarial Networks is the most time-consuming with limited performance benefits.

关键词： Data augmentation Federated learning Internet of things Anomaly detection Machine learning

Enhancing Data Analysis and Automation: Integrating Python with Microsoft Excel for Non-Programmers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Building Custom Spreadsheet Functions with Python:End-User Software Engineering Approach

Journal of Software Engineering and Applications（软件工程与应用） 2024年第6期 530页

作者： Osama Magdy Ali Mohamed Breik Tarek Aly Atef Tayh nour El-Din Raslan Mervat Gheith

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Remarkable Link between Projected Uncertainties of Arctic Sea-Ice Decline and Winter Eurasian Climate

Journal of Software Engineering and Applications（软件工程与应用） 2024年第5期 246页

作者： Tamer Bahgat Elserwy Atef Tayh nour El-Din Raslan Tarek Ali Mervat H.Gheith

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2018年第1期35卷 38-51页

作者： Hoffman H.N.CHEUNG Noel KEENLYSIDE nour-Eddine OMRANI Wen ZHOU Geophysical Institute University of BergenBergen 5007Norway Bjerknes Centre for Climate Research University of BergenBergen 5007Norway Nansen Environmental and Remote Sensing Center Bergen 5006Norway Guy Carpenter Asia-Pacific Climate Impact Centre School of Energy and EnvironmentCity University of Hong KongHong KongChina City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China

We identify that the projected uncertainty of the pan-Arctic sea-ice concentration(SIC) is strongly coupled with the Eurasian circulation in the boreal winter(December–March; DJFM), based on a singular value decomposition(SVD) analysis of the forced response of 11 CMIP5 models. In the models showing a stronger sea-ice decline, the Polar cell becomes weaker and there is an anomalous increase in the sea level pressure(SLP) along 60°N, including the Urals–Siberia region and the Iceland low region. There is an accompanying weakening of both the midlatitude westerly winds and the Ferrell cell,where the SVD signals are also related to anomalous sea surface temperature warming in the midlatitude North *** the Mediterranean region, the anomalous circulation response shows a decreasing SLP and increasing precipitation. The anomalous SLP responses over the Euro-Atlantic region project on to the negative North Atlantic Oscillation–like ***, pan-Arctic SIC decline could strongly impact the winter Eurasian climate, but we should be cautious about the causality of their linkage.

关键词： Arctic climate Siberian high Icelandic low three-cell meridional circulation

An Acceptance Model of Using Mobile-Government Services(AMGS)

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

Computer Modeling in Engineering & Sciences 2022年第5期131卷 865-880页

作者： Ahmad Althunibat Mohammad Abdallah Mohammed Amin Almaiah nour Alabwaini Thamer Ahmad Alrawashdeh Department of Software Engineering Faculty of Science and Information TechnologyAl-Zaytoonah University of JordanAmmanJordan Faculty of Computer Sciences and Information Technology King Faisal UniversityAl-AhsaSaudi Arabia

In recent years,the telecommunications sector is no longer limited to traditional communications,but has become the backbone for the use of data,content and digital applications by individuals,governments and companies to ensure the continuation of economic and social activity in light of social distancing and total closure inmost countries in the ***,electronic government(e-Government)andmobile government(m-Government)are the results of technological evolution and ***,it is important to investigate the factors that influence the intention to use m-Government services among Jordan’s *** paper proposed a new m-Government acceptance model in Jordan(AMGS);this model combines the Information System(IS)Success Factor Model and Hofstede Cultural Dimensions *** study was conducted by surveying different groups of the Jordanian *** questionnaire was used to collect data from203 *** regression analysis has been conducted to analyze the *** results indicate that the significant predictors of citizen intention to use m-Government services in Jordan are Information Quality,Service Quality,Uncertainty Avoidance,and Indulgence ***,the results also suggest that Power Distance is not a significant predictor of citizen intention to use m-Government services.

关键词： Acceptance test e-Government m-Government acceptance model IS success factor model Hofstede cultural dimensions theory