检索结果-南通市图书馆

Obstructive jaundice in Iran:factors affecting early outcome

Hepatobiliary & Pancreatic Diseases International 2008年第5期7卷 515-519页

作者： mehrdad moghimi Seyed Ali Marashi Mohammad Taghi Salehian mehrdad Sheikhvatan Taleghani Hospital Shahid Beheshti University of Medical Sciences Tehran Heart Center Tehran University of Medical Sciences TehranIran

BACKGROUND:Understanding any factors which influence the morbidity and mortality in patients with obstructive jaundice in each society will better guide appropriate management and lead to improved survival This study aimed to assess baseline etiologies,clinical manifestations,diagnostic results,and morbidity and mortality related to obstructive jaundice in Iranian patients. METHODS:The hospital recorded files of 133 patients with the final diagnosis of obstructive jaundice who had been admitted to the Taleqhani Hospital in Tehran between January 2001 and September 2004 were reviewed. RESULTS:The most common etiologies of obstructive jaundices were neoplasia and then common bile duct stone in the two *** results of ultrasonography were positive in less than half of the ***,the most positive results were related to endoscopic retrograde cholangiopancreatography(ERCP).The in-hospital mortality rate in patients less than 50 years old and elderly patients was 0%and 6.76%,*** in-hospital morbidity rate was 2.25%and 7.51%,respectively in both patients and it was commonly related to infection of ulcer (44.46%),pneumonia(14.75%),myocardial infarction (14.75%),and subdiaphragmatic abscess(11.29%).In patients with a diagnosis of benign obstruction,only one patient died of severe *** malignant group preoperative characteristics,such as weight loss(P=0.015) and serum bilirubin concentration more than 16 mg/dl and postoperative complications,such as sepsis(P<0.001) cardiac arrest(P<0.001),and hepatic coma(P<0.001)were main predictors for the in-hospital mortality ***:Although the mortality and morbidity of obstructive jaundice in our study are less than those in other studies,the determination of preoperative clinical and laboratory indices and postoperative complications of patients is needed for the control of mortality and morbidity rate.

关键词： obstructive jaundice diagnosis mortality morbidity

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

Surgical Outcomes and Local Recurrence Following Total or Subtotal Gastrectomy for Early Adenocarcinoma of Antrum

引用

Chinese Journal of Cancer Research 2008年第4期20卷 279-285页

作者： mehrdad moghimi Seyed Ali Marashi Taghi Salehian Habibollah Peirovi Faezeh Sodagari Taleghani Hospital Shahid Beheshti University of Medical Sciences Iran University of Medical Sciences

Objective： The choice between total gastrectomy （TG） and subtotal gastrectomy （STG） for early adenocarcinoma of the lower third of the stomach is still a matter of debate and controversy amongst surgeons. The aim of this study was to compare the surgical outcomes, quality of life （QoL）, and local recurrence rates as well as other results of curative resection of early distal adenocarcinoma of the stomach using TG or STG performed in Iran. Methods： Hospital records of 66 patients with early distal adenocarcinoma of stomach that underwent even total or subtotal gastrectomy with perigastric （D2） lymphadenectomy between October 2001 and February 2006 in Taleghani Hospital, Iran were reviewed retrospectively. Demographic data as well as clinicopathological factors including number of involved lymph nodes, tumor grading, depth of invation, tumor size, and tumor type were recorded. Post-operative outcomes including mortality and morbidity, tumor recurrence and quality of life were assessed. Univariate analyses using Fisher＇s exact test, the Student t-test, and the Pearson χ^2 test were used. Results： Local recurrence of tumor was found in 8 （23%） TG group patients and in 19 （61%） patients of STG group, the Pearson χ^2 test showed a significant higher recurrence rate in STG （P value=0.002, Relative Risk=2.68, Confidence Interval： 1.37-5.24）.The mean time interval between gastrectomy and tumor recurrence was not different between TG and STG. （19.75±5.1 vs. 18.0±7.8 respectively; P value=0.507） Tumor size 〉5 cm （P value=0.004）, diffuse type （P value=0.034）, poor differentiation （P value=0.000） and serosal invasion （P value=0.012） were found to be significantly related to tumor recurrence in patients undergone gastrectomy. In none of the QoL measures a significant difference was found between TG and STG Conclusion： Our results show that subtotal and total gastrectomy methods with perigastric lymphadenectomy have a similar postoperative complication rate and surgical outcomes a

关键词： Gastrectomy Adenocarcinoma Recurrence rate

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

Quantum dense coding with gravitational cat states

引用

Communications in Theoretical Physics 2024年第3期76卷 84-90页

作者： Saeed Haddadi mehrdad Ghominejad Artur Czerwinski Faculty of Physics Semnan UniversityP.O.Box 35195-363SemnanIran Centre for Quantum Optical Technologies Centre of New TechnologiesUniversity of WarsawBanacha 2c02-097 WarszawaPoland

A protocol of quantum dense coding with gravitational cat states is *** explore the effects of temperature and system parameters on dense coding capacity and provide an efficient strategy to preserve the quantum advantage of dense coding for these *** results may open new opportunities for secure communication and insights into the fundamental nature of gravity in the context of quantum information processing.

关键词： quantum dense coding gravitational cat states quantum advantage

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

Synergistic effect of adsorption and photocatalytic degradation of oilfield-produced water by electrospun photocatalytic fibers of Polystyrene/Nanorod-Graphitic carbon nitride

引用

Journal of Environmental Sciences 2024年第7期141卷 287-303页

作者： Parisa Azmoon mehrdad Farhadian Alireza Pendashteh Amir H.Navarchian Department of Chemical Engineering Faculty of EngineeringUniversity of IsfahanIsfahanIran Department of Chemical Engineering Faculty of EngineeringUniversity of GuilanRashtIran Department of Water and Environmental Engineering Caspian Sea Basin Research CenterUniversity of GuilanRashtIran

Graphitic carbon nitride with nanorod structure(Nr-GCN)was synthesized using melamine as a precursor without any other reagents by hydrothermal pretreatment ***,FTIR,SEM,N_(2)adsorption-desorption from BET,UV-Vis DRS spectroscopy,and photoluminescence were used to characterize the prepared ***,the photoelectrochemical behavior of nanoparticles was studied by photocurrent transient response and cyclic voltammetry ***(PS)fibrous mat was fabricated by electrospinning technique and used as a support for the stabilization of the *** performance of the synthesized nanoparticles and photocatalytic fibers(PS/Nr-GCN)was evaluated in oilfield-produced water treatment under visible light *** this process,oil contaminants were adsorbed by hydrophobic polystyrene fibers and simultaneously degraded by *** removal efficiency of chemical oxygen demand(COD)has been obtained 96.6%and 98.4%by Nr-GCN and PS/Nr-GCN,respectively,at the optimum conditions of pH4,photocatalyst dosage 0.5 g/L,COD initial concentration 550 mg/L,and illumination time 150 *** gas chromatography-mass spectroscopy analysis results showed 99.3%removal of total petroleum hydrocarbons using photocatalytic fibers of PS/*** results demonstrated that the GCN has outstanding features like controllable morphology,visible-light-driven,and showing high potential in oily wastewater ***,the synergistic effect of adsorption and photocatalytic degradation is an effective technique in oilfield-produced water treatment.

关键词： Graphitic carbon nitride(GCN) Nanorod structure Polystyrene fibrous mat Photocatalytic fibers Oilfield-produced water(OPW)

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

Enhancing Hyper-Spectral Image Classification with Reinforcement Learning and Advanced Multi-Objective Binary Grey Wolf Optimization

引用

Computers, Materials & Continua 2024年第6期79卷 3469-3493页

作者： mehrdad Shoeibi Mohammad Mehdi Sharifi Nevisi Reza Salehi Diego Martín Zahra Halimi Sahba Baniasadi TheWPI Business School Worcester Polytechnic InstituteWorcesterMassachusetts01609-2280USA Department of Industrial Engineering Iran University of Science and TechnologyNarmakTehran16846-13114Iran ETSI de Telecomunicación Universidad Politécnica de MadridAv.Complutense 30Madrid28040Spain Department of Civil and Environmental Engineering University of MarylandCollege ParkMaryland20742USA Department of Industrial Engineering College of EngineeringUniversity of HoustonHoustonTexas77204USA

Hyperspectral(HS)image classification plays a crucial role in numerous areas including remote sensing(RS),agriculture,and the monitoring of the *** band selection in HS images is crucial for improving the efficiency and accuracy of image *** process involves selecting the most informative spectral bands,which leads to a reduction in data *** on these key bands also enhances the accuracy of classification algorithms,as redundant or irrelevant bands,which can introduce noise and lower model performance,are *** this paper,we propose an approach for HS image classification using deep Q learning(DQL)and a novel multi-objective binary grey wolf optimizer(MOBGWO).We investigate the MOBGWO for optimal band selection to further enhance the accuracy of HS image *** the suggested MOBGWO,a new sigmoid function is introduced as a transfer function to modify the wolves’*** primary objective of this classification is to reduce the number of bands while maximizing classification *** evaluate the effectiveness of our approach,we conducted experiments on publicly available HS image datasets,including Pavia University,Washington Mall,and Indian Pines *** compared the performance of our proposed method with several state-of-the-art deep learning(DL)and machine learning(ML)algorithms,including long short-term memory(LSTM),deep neural network(DNN),recurrent neural network(RNN),support vector machine(SVM),and random forest(RF).Our experimental results demonstrate that the Hybrid MOBGWO-DQL significantly improves classification accuracy compared to traditional optimization and DL ***-DQL shows greater accuracy in classifying most categories in both datasets *** the Indian Pine dataset,the MOBGWO-DQL architecture achieved a kappa coefficient(KC)of 97.68%and an overall accuracy(OA)of 94.32%.This was accompanied by the lowest root mean square error(RMSE)of 0.94,indicating very precise

关键词： Hyperspectral image classification reinforcement learning multi-objective binary grey wolf optimizer band selection

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

Molecular investigation of exoU and exoY virulence genes in Pseudomonas aeruginosa collected from hospitalized patients in North of Iran:A descriptive-analytical study

引用

Journal of Acute Disease 2024年第2期13卷 74-80页

作者： Ahmad Reza Moradi mehrdad Gholami Lotfollah Davoodi Negar Hajilou Hamid Reza Goli Sana Institute of Higher Education SariIran Department of Medical Microbiology and Virology Faculty of MedicineMazandaran University of Medical SciencesSariIran Antimicrobial Resistance Research Center Faculty of MedicineMazandaran University of Medical SciencesSariIran Molecular and Cell Biology Research Center Faculty of MedicineMazandaran University of Medical SciencesSariIran

Objective:To investigate the frequency of exoU and exoY genes in patients with Pseudomonas aeruginosa ***:In this study,100 clinical isolates of Pseudomonas aeruginosa were collected from patients hospitalized in educational-therapeutic hospitals and were identified using standard microbiological ***,the antibiotic resistance pattern of the isolates was determined by the disk agar diffusion *** bacterial DNAs were extracted by the alkaline lysis ***,the presence of exoU and exoY genes was evaluated by the PCR ***:In this study,47%,72%,29%,39%,40%,and 44%of the isolates were non-susceptible to piperacillin,aztreonam,ceftazidime,imipenem,tobramycin,and ciprofloxacin,*** addition,95%and 93%of the clinical isolates carried the exoU and exoY *** and fecal isolates had both virulence genes,while only one wound isolate had neither ***,all urinary isolates contained the exoY gene and only one isolate lacked the exoU ***,88 isolates simultaneously had both exoU and exoY ***:High prevalence of exoU and exoY genes in this region indicates a significant role of typeⅢsecretion system in pathogenesis of Pseudomonas *** typeⅢsecretion system may be a suitable target to reduce the pathogenicity of this bacterium.

关键词： Pseudomonas aeruginosa exoU exoY Virulence gene TypeⅢsecretion system PCR

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

Expression level of interferon-stimulated genes PKR,OAS1,MX1,and ISG15 in peripheral blood mononuclear cells of COVID-19 patients:A retrospective study

引用

Journal of Acute Disease 2024年第3期13卷 111-115页

作者： Elham Jafari Maskouni Samaneh Abbasi Elham Mousavi Zahra Najafimemar Ali Mohammad Arabzadeh mehrdad Farrokhnia Saeedeh Ebrahimi Department of Medical Microbiology(Bacteriology&Virology) Afzalipour Faculty of MedicineKerman University of Medical SciencesKermanIran Abadan University of Medical Sciences AbadanIran Infectious Diseases Research Center Golestan University of Medical SciencesGorganIran Department of Internal Medicine Afzalipour School of MedicineKerman University of Medical SciencesKermanIran

Objective:To explore expression level of interferon-stimulated genes PKR,OAS1,MX1,and ISG15 in peripheral blood mononuclear cells of COVID-19 ***:In this study,changes in the expression of four interferon-stimulated genes(ISGs),including PKR,OAS1,MX1,and ISG15,in peripheral blood mononuclear cells of 45 COVID-19 patients with different severities were evaluated by real-time PCR ***:OAS1,MX1,PKR,and ISG15 were differently expressed in COVID-19 patients with different *** results showed that the expression of OAS1,MX1,PKR,and ISG15 genes was significantly(P=0.001)lower in severe ***:Weak and defective IFN response and subsequent disruption of ISGs may be associated with COVID-19 severity.

关键词： COVID-19 SARS-CoV-2 Interferon ISGs Severe COVID-19 Risk factors Interferon signaling

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 reputation-based mining paradigm under dishonest mining attacks

引用

Blockchain(Research and Applications) 2022年第2期3卷 75-89页

作者： Pouya Pourtahmasbi mehrdad Nojoumian Florida Atlantic University Department of Electrical Engineering and Computer Science777 Glades RoadBoca RatonFL33431USA

Since the introduction of Bitcoin,numerous studies on Bitcoin mining attacks have been conducted,and as a result,many countermeasures to these attacks have been *** reputation-based mining paradigm is a comprehensive countermeasure solution to this problem with the goal of regulating the mining process and preventing mining *** is accomplished by incentivizing miners to avoid dishonest mining strategies using reward and punishment *** model was validated solely based on game theoretical analyses,and the real-world implications of this model are not known due to the lack of empirical *** shed light on this issue,we designed a simulated mining platform to examine the effectiveness of the reputation-based mining paradigm through data *** implemented block withholding attacks in our simulation and ran the following three scenarios:Reputation mode,non-reputation mode,and no attack *** comparing the results from these three scenarios,interestingly,we found that the reputation-based mining paradigm decreases the number of block withholding attacks,and as a result,the actual revenue of individual miners becomes closer to their theoretical expected *** addition,we observed that the confidence interval test can effectively detect block withholding attacks;however,the test also results in a small number of false positive *** the effectiveness of the reputation-based model relies on attack detection,further research is needed to investigate the effect of this model on other dishonest mining strategies.

关键词： Blockchain Cryptocurrency Mining attacks Block withholding attack Trust models Reputation systems

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

Evaluation of the stability of terraced slopes in clayey gravel soil using a novel numerical technique

引用

Frontiers of Structural and Civil Engineering 2023年第5期17卷 796-811页

作者： mehrdad KARAMI Mohammad NAZARI-SHARABIAN James BRISTOW Moses KARAKOUZIAN Department of Civil and Environmental Engineering and Construction University of NevadaLas VegasLas VegasNV 89154USA Department of Mathematics Engineeringand Computer ScienceWest Virginia State UniversityInstituteWV 25112USA R&D Department Universal Engineering SciencesLas VegasNV 89118USA

Conventional geotechnical software limits the use of the strength reduction method(SRM)based on the Mohr–Coulomb failure criterion to analyze the slope safety factor(SF).The use of this constitutive model is impractical for predicting the behavior of all soil *** the present study,an innovative numerical technique based on SRM was developed to determine SF using the finite element method and considering the extended Cam–clay constitutive model for clayey gravel soil as opposed to the Mohr–Coulomb *** this regard,a novel user subroutine code was employed in ABAQUS to reduce the stabilizing forces to determine the failure surfaces and resist and drive shear stresses on a *** validating the proposed technique,it was employed to investigate the performance of terraced slopes in the context of a case *** impacts of geometric parameters and different water table elevations on the SF were *** results indicated that an increase in the upper and lower slope heights led to a decrease in SF,and a slight increase in the horizontal offset led to an increase in the ***,when the water table elevation was lower than the toe of the terraced slope,the SF increased because of the increase in the uplift force as a resistant component.

关键词： terraced slope safety factor finite element method ABAQUS extended Camclay

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

State identification of home appliance with transient features in residential buildings

引用

Frontiers in Energy 2022年第1期16卷 130-143页

作者： Lei YAN Runnan XU mehrdad SHEIKHOLESLAMI Yang LI Zuyi LI Electrical and Computer Engineering Department Illinois Institute of TechnologyChicagoIL 60616USA School of Electrical Engineering Northeast Electric Power UniversityJilin 132012China

Nonintrusive load monitoring(NILM)is crucial for extracting patterns of electricity consumption of household appliance that can guide users9 behavior in using electricity while their privacy is *** study proposes an online method based on the transient behavior of individual appliances as well as system steady-state characteristics to estimate the operating states of the *** determines the number of states for each appliance using the density-based spatial clustering of applications with noise(DBSCAN)method and models the transition relationship among different *** states of the working appliances are identified from aggregated power signals using the Kalman filtering method in the factorial hidden Markov model(FHMM).Thereafter,the identified states are confirmed by the verification of system states,which are the combination of the working states of individual *** verification step involves comparing the total measured power consumption with the total estimated power *** use of transient features can achieve fast state inference and it is suitable for online load *** proposed method was tested on a high-resolution data set such as Labeled hlgh-Frequency daTaset for Electricity Disaggregation(LIFTED)and it outperformed other related methods in the literature.

关键词： nonintrusive load monitoring(NILM) load disaggregation online load disaggregation Kalman filtering factorial hidden Markov model(FHMM) Labeled hlgh-Frequency daTaset for Electricity Disaggregation(LIFTED)

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：