检索结果-南通市图书馆

Spinal dural arteriovenous fistula:a comprehensive review of the history,classification systems,management,and prognosis

在线全文

学校读者我要写书评

暂无评论

Chinese Neurosurgical Journal 2024年第1期10卷 48-56页

作者： Ali Alkhaibary Ahoud Alharbi Nada Alnefaie Hajar Alammar Alshaymaa M.Arishy Noor Alghanim Yazeed M.Aldhfyan Arwa Albaiahy Yahya H.Khormi Wael Alshaya saad AlQahatani Ahmed Aloraidi Ahmed Alkhani Sami Khairy College of Medicine King Saud Bin Abdulaziz University for Health SciencesRiyadhSaudi Arabia King Abdullah International Medical Research Center RiyadhSaudi Arabia Division of Neurosurgery Department of SurgeryKing Abdulaziz Medical CityMinistry of National Guard-Health AffairsRiyadhSaudi Arabia Department of Neurosurgery National Neurosciences InstituteKing Fahad Medical CityRiyadhSaudi Arabia College of Medicine Jazan UniversityJazanSaudi Arabia Department of Neurosurgery King Faisal Specialist Hospital and Research CenterRiyadhSaudi Arabia Department of Surgery Faculty of MedicineJazan UniversityJazanSaudi Arabia

Spinal dural arteriovenous fistulas account for the majority of spinal vascular *** are typically located in the thoracolumbar region and are diagnosed in the middle-aged and elderly *** spinal dural arteriovenous fistulas have been postulated to be acquired,their exact development remains ***,the arteriovenous shunt is situated close to the spinal nerve root,inside the dura mater,where the blood from the radiculomeningeal artery and radicular vein *** history,there have been multiple classification systems of spinal arteriovenous shunts since *** were mainly based on the evolution of diagnostic studies as well as the treatment of these *** classification systems have undergone significant changes over the *** intracranial dural arteriovenous fistula,spinal dural arteriovenous fistula is progressive in *** neurological manifestations,due to venous congestion,tend to be insidious as well as *** include sensory deficits,such as paresthesia,bilateral and/or unilateral radicular pain affecting the lower limbs,and gait *** dural arteriovenous fistulas can be suspected on magnetic resonance imaging/magnetic resonance angiography and confirmed by digital subtraction angiography(DSA).The management includes surgery,endovascular therapy,and in selected cases,*** treatment goal of spinal dural arteriovenous fistula is to halt the progression of the *** prognosis depends on both the duration of symptoms as well as the clinical condition prior to *** present article comprehensively reviews the pathophysiology,changes in classification systems,natural history,clinical manifestations,radiological features,management,and prognosis.

关键词： Connection Endovascular Myelopathy Vascular

A simulation of doping and trap effects on the spectral response of AlGaN ultraviolet detectors

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2012年第3期33卷 20-23页

作者： Sidi Ould saad Hamady LMOPS University Paul Verlaine-Metz and SUPELEC-2 Rue Edouard Belin57070 MetzFrance

We study,by means of numerical simulation,the impact of doping and traps on the performance of the＂solar blind＂ultraviolet Schottky detector based on *** implemented physical models and AlGaN material properties taken from the literature,or from the interpolation between the binary materials（GaN and AlN） weighted by the mole *** found that doping and traps highly impact the spectral response of the device,and in particular a compromise in the doping concentration must be reached in order to optimize the spectral response of the *** results give us a powerful tool to quantitatively understand the impact of elaboration and processing conditions on photodetector characteristics,and thus identify the key issues for the development of the technology.

关键词： simulation AlGaN ultraviolet detector spectral response

Characterization of 3D microstructure,thermal conductivity,and heat flow of cement-based foam using imaging technique

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2021年第3期15卷 643-651页

作者： Farnaz BATOOL Muhammad saad KHAN Vivek BINDIGANAVILE Department of Civil Engineering NED University of Engineering&TechnologyKarachi75270Pakistan Department of Civil and Environmental Engineering University of AlbertaEdmontonT6G2R3Canada

This study presents the results of the 3D microstructure,thermal conductivity,and heat flow in cement-based foams and examines their changes with a range of *** were captured using X-ray micro computed tomography(micro-CT)imaging technique on cement-based foam samples prepared with densities of 400,600,and 800 kg/m^(3).These images were later simulated and quantified using 3D data visualization and analysis *** on the analysis,the pore volume of 11000µm^(3)was determined across the three densities,leading to optimal ***,distinct pore diameters of 15µm for 800 kg/m^(3),and 20µm for 600 and 400 kg/m^(3)were found to be *** of the pores were spherical,with only 10%appearing elongated or *** addition,a difference of 15%was observed between the 2D and 3D porosity ***,a difference of 5%was noticed between the experimentally measured thermal conductivity and the numerically predicted value and this variation was constant across the three cast *** 3D model showed that heat flows through the cement paste solids and with an increase in porosity this flow reduces.

关键词： 3D pore volume distribution X-ray tomography 3D shape factor heat flow

Epileptic Seizures Diagnosis Using Amalgamated Extremely Focused EEG Signals and Brain MRI

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第1期74卷 623-639页

作者： Farah Mohammad saad Al-Ahmadi Department of Computer Science King Saud UniversityRiyadh11543Saudi Arabia

There exists various neurological disorder based diseases like tumor,sleep disorder,headache,dementia and *** these,epilepsy is the most common neurological illness in humans,comparable to *** is a severe chronic neurological illness that can be discovered through analysis of the signals generated by brain neurons and brain Magnetic resonance imaging(MRI).Neurons are intricately coupled in order to communicate and generate signals from human *** to the complex nature of electroencephalogram(EEG)signals and MRI’s the epileptic seizures detection and brain related problems diagnosis becomes a challenging *** based techniques and machine learning models are continuously giving their contributions to diagnose all such diseases in a better way than the normal process of *** performancemay sometime degrade due to missing information,selection of poor classification model and unavailability of quality data that are used to train the models for better *** research work is an attempt to epileptic seizures detection by using amulti focus dataset based on EEG signals and *** key steps of this work are:feature extraction having two different streams i.e.,EEGusingwavelet transformation along with SVD-Entropy,and MRI using convolutional neural network(CNN),after extracting features fromboth streams,feature fusion is applied to generate feature vector used by support vector machine(SVM)to diagnose the epileptic *** the experimental evaluation and results comparison with the current state-of-the-art techniques,it has been concluded that the performance of the proposed scheme is better than the existing models.

关键词： Epilepsy EEG MRI CNN SVM

Elucidating the molecular basis of ATP-induced cell death in breast cancer: Construction of a robust prognostic model

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

World Journal of Clinical Oncology 2024年第2期15卷 208-242页

作者： Hao-Ling Zhang Sandai Doblin Zhong-Wen Zhang Zhi-Jing Song Babu Dinesh Yasser Tabana DahhamSabbar saad Mowaffaq Adam Ahmed Adam Yong Wang Wei Wang Hao-Long Zhang Sen Wu Rui Zhao Barakat Khaled Department of Biomedical Sciences Advanced Medical and Dental InstituteUniversiti Sains MalaysiaPenang 13200Malaysia School of Public Health Gansu University of Chinese MedicineLanzhou 730000Gansu ProvinceChina Clinical College of Chinese Medicine Gansu University of Chinese MedicineLanzhou 730000Gansu ProvinceChina Faculty of Pharmacy and Pharmaceutical Sciences University of AlbertaEdmonton AB T6G 2E1Canada Department of Science University of Technology and Applied Sciences RustaqRustaq 10 P.C.329Oman Department of Chemistry and Biochemistry San Diego State UniversitySan DiegoCA 92182United States Department of Pathology Center Gansu University of Chinese MedicineLanzhou 730000Gansu ProvinceChina College of Acupuncture-moxibustion and Tuina Gansu University of Chinese MedicineLanzhou 730000Gansu ProvinceChina Universiti Sains Malaysia Advanced Medical and Dental InstitutePenang 13200Malaysia Department of Biomedical Science Universiti Sains MalaysiaPenang 13200Malaysia

BACKGROUND Breast cancer is a multifaceted and formidable disease with profound public health *** demise mechanisms play a pivotal role in breast cancer pathogenesis,with ATP-triggered cell death attracting mounting interest for its unique specificity and potential therapeutic *** To investigate the impact of ATP-induced cell death(AICD)on breast cancer,enhancing our understanding of its *** The foundational genes orchestrating AICD mechanisms were extracted from the literature,underpinning the establishment of a prognostic ***,a microRNA(miRNA)prognostic model was constructed that mirrored the gene-based prognostic *** between high-and low-risk cohorts within mRNA and miRNA characteristic models were scrutinized,with the aim of delineating common influence mechanisms,substantiated through enrichment analysis and immune infiltration *** The mRNA prognostic model in this study encompassed four specific mRNAs:P2X purinoceptor 4,pannexin 1,caspase 7,and cyclin *** miRNA prognostic model integrated four pivotal miRNAs:hsa-miR-615-3p,hsa-miR-519b-3p,hsa-miR-342-3p,and hsa-miR-324-3p.B cells,CD4+T cells,CD8+T cells,endothelial cells,and macrophages exhibited inverse correlations with risk scores across all breast cancer ***,Kyoto Encyclopedia of Genes and Genomes analysis revealed that genes differentially expressed in response to mRNA risk scores significantly enriched 25 signaling pathways,while miRNA risk scores significantly enriched 29 signaling pathways,with 16 pathways being jointly *** Of paramount significance,distinct mRNA and miRNA signature models were devised tailored to AICD,both potentially autonomous prognostic *** study's elucidation of the molecular underpinnings of AICD in breast cancer enhances the arsenal of potential therapeutic tools,offering an unparalleled window for innovative ***,this paper revea

关键词： ATP-induced cell death mRNA miRNA Prognostic model Breast cancer

Sensitivity-based upscaling for history matching of reservoir models

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

Petroleum Science 2016年第3期13卷 517-531页

作者： saad Mehmood Abeeb A.Awotunde United Energy Pakistan Bahria Complex-l M.T. Khan Road Karachi 74000 Sindh Pakistan Department of Petroleum Engineering King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia

Simulation of reservoir flow processes at the finest scale is computationally expensive and in some cases ***,upscaling of several fine-scale grid blocks into fewer coarse-scale grids has become an integral part of reservoir simulation for most *** is because as the number of grid blocks increases,the number of flow equations increases and this increases,in large proportion,the time required for solving flow *** we can adopt parallel computation to share the load,a large number of grid blocks still pose significant computational ***,upscaling acts as a bridge between the reservoir scale and the simulation *** as the upscaling ratio is increased,the accuracy of the numerical simulation is reduced;hence,there is a need to keep a balance between the *** this work,we present a sensitivity-based upscaling technique that is applicable during history *** method involves partial homogenization of the reservoir model based on the model reduction pattern obtained from analysis of the sensitivity *** technique is based on wavelet transformation and reduction of the data and model spaces as presented in the 2Dwp-wk *** the 2Dwp-wk approach,a set of wavelets of measured data is first selected and then a reduced model space composed of important wavelets is gradually built during the first few iterations of nonlinear *** building of the reduced model space is done by thresholding the full wavelet sensitivity *** pattern of permeability distribution in the reservoir resulting from the thresholding of the full wavelet sensitivity matrix is used to determine the neighboring grids that are *** essence,neighboring grid blocks having the same permeability values due to model space reduction are combined into a single grid block in the simulation model,thus integrating upscaling with wavelet multiscale inverse *** apply the method to estimate the parameters

关键词： Upscaling Inverse analysis History matching Sensitivity Wavelets

Assessment of Urban Sprawl on Agricultural Soil of Northern Nile Delta of Egypt Using RS and GIS

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2015年第3期25卷 274-282页

作者： Adel SHALABY Farahat saad MOGHANM National Authority for Remote Sensing and Space Sciences Soil and Water Science Department-faculty of Agricultural-Kafrelsheikh University

Urban sprawl is threatening the limited highly fertile land in the Nile delta of Egypt. Landsat TM satellite images of 1984, 1992 and ETM+ of 2006 have been used to study the impact of urban sprawl on agricultural land of the Northern Nile delta, Egypt. Visual interpretation using on screen digitizing and change detection techniques were applied for monitoring the urban sprawl. Combining the land capability map and the urban thematic layer using GIS made it possible to point out the risk of urban expansion on the expense of the highly capable soil class. The results show that a total expansion of urban area amounted to 689.20 km2(6.3% of total area) during the study period 1984–2006. The urban expansion during the 1984–2006 was on the expense of the most fertile soils where, the high capable soils(Class I) lost 247.14 km2(2.26 % of total area) and the moderate capable soils lost 32.73 km2(0.3% of total area), while the low capable soils lost only 57.39 km2(0.53% of total area). The urban encroachment over the non capable soils was very limited during the study period 1984–1992, where 7.33 km2 only was lost. The pattern of urban sprawl has been changed during the 1992 to 2006 whereas much larger area(50.64 km2) of the non capable soils was converted to urban. It can be concluded that the urban sprawl is one of the dominant degradation process on the land of Nile Delta.

关键词： urbanization remote sensing GIS land cover changes land use policy Nile Delta of Egypt

Improved Semi-empirical Model of Proton Exchange Membrane Fuel Cell Incorporating Fault Diagnostic Feature

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1566-1573页

作者： saad Saleem Khan Hussain Shareef Ahmad Asrul Ibrahim Department of Electrical Engineering College of EngineeringUnited Arab Emirates University IEEE Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia

The membrane water content of the proton exchange membrane fuel cell(PEMFC)is the most important feature required for water management of the PEMFC *** improper management of water in the fuel cell may lead to system *** various faults,flooding and drying faults are the most frequent in the PEMFC *** paper presents a new dynamic semi-empirical model which requires only the load current and temperature of the PEMFC system as the input while providing output voltage and membrane water content as its major *** other PEMFC systems,the proposed dynamic model calculates the internal partial pressure of oxygen and hydrogen rather than using special internal ***,the membrane water content and internal resistances of PEMFC are modelled by incorporating the load current condition and temperature of the PEMFC *** model parameters have been extracted by using a quantum lightening search algorithm as an optimization technique,and the performance is validated with experimental data obtained from the NEXA 1.2 k W PEMFC *** further demonstrate the capability of the model in fault detection,the variation in membrane water content has been studied via the *** proposed model could be efficiently used in prognostic and diagnosis systems of PEMFC fault.

关键词： Proton exchange membrane fuel cell(PEMFC)fault membrane water content modelling optimization quan-tum lightening search algorithm

Evolution of care in cirrhosis: Preventing hepatic decompensation through pharmacotherapy

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第1期29卷 61-74页

作者： Seohyuk Lee saad Saffo Department of Medicine Section of Digestive DiseasesYale School of MedicineNew HavenCT 06520-8019United States

Cirrhosis is a leading cause of morbidity and mortality,impacting more than 120 million people *** geographic differences exist,etiologic factors such as alcohol use disorder,chronic viral hepatitis infections,and non-alcoholic fatty liver disease are prevalent in nearly every ***,significant effort has been devoted to modifying these risks to prevent disease ***,more than 11%of patients with compensated cirrhosis experience hepatic decompensation each *** transition signifies the most important prognostic factor in the natural history of the disease,corresponding to a decline in median survival to below 2 *** the past decade,the need for pharmacotherapies aimed at reducing the risk for hepatic decompensation has been emphasized,and non-selective beta-blockers have emerged as the most effective option to ***,a critical therapeutic gap still exists,and additional therapies have been proposed,including statins,rifaximin,and sodium-glucose cotransporter-2 *** on the results of innovative retrospective analyses and small-scale prospective trials,these pharmacotherapies represent promising options,but further studies,including randomized controlled trials,are necessary before they can be incorporated into clinical *** report highlights the potential impact of these agents and others in preventing hepatic decompensation and discusses how this paradigm shift may pave the way for guideline-directed medical therapy in cirrhosis.

关键词： Cirrhosis Hepatic decompensation Beta-blockers Statins Sodium-glucose cotransporter-2 inhibitors Rifaximin