检索结果-南通市图书馆

porosity enhancement potential through dolomitization of carbonate reservoirs, a case of study from the Euphrates Graben fields, East Syria

在线全文

学校读者我要写书评

暂无评论

petroleum 2023年第2期9卷 183-198页

作者： Yousef Ibrahem Morozov V.p. Mohammad el Kadi Abdullah Alaa Institute of Geology and petroleum Technologies Kazan Federal UniversityKazan420008Russia Department of Geology Damascus UniversityDamascusSyrian Arab Republic

The dolostones and dolomitic limestones of the lower Cretaceous Judea formation are a key target ofhydrocarbons in most of the Euphrates Graben fields. Core materials investigation, thin sections petrographicallyexaminations, and petrophysical evaluations were obtained to determine enhancement ofthe porosity through dolomitization. Results showed that the lagoon-shallow marine carbonates of theJudea formation are subdivided into two main zones;the upper “limestone zone” is micritic limestonesdominated with no reservoir potential, and the lower “dolomite zone” is dolomitic limestones anddolostones dominated with good to very good reservoir potential. Dolomitization of the mudstones andwackestones of the micritic limestones resulted in formation of microcrystalline dolomicrite and earlyfabric destructive dolomites. Conversely, dolomitization of the packstones and grainstones resulted information of the fabric destructive and saddle dolomites. Based on petrography data, dolomitization ofthe “limestone zone” is interpreted by the seawater dolomitization mechanism at low-temperatures,while dolomitization of the “dolomite zone” is interpreted by the burial dolomitization mechanismunder high temperature and pressure conditions. The “limestone zone” is characterized by the poorestreservoir quality, while the “dolomite zone” is characterized by the best reservoir quality. The seawaterdolomitization did not significantly enhance the porosity, while the burial dolomitization contributes toenhancing the preserved secondary porosity. Stylolites microfractures and dissolution seams associatedwith dolomitization played as major factors in porosity enhancement of the dolostones and dolomiticlimestones and serving as pathways for hydrocarbon migration. Dissolution processes increased theporosity and more permeability unless they are filled with the precipitated dolomite and/or *** had significant effects on the porosity by blocking the cavities and channels and dec

关键词： porosity development Dolomitization Judea Euphrates graben Syria

Turbulent flame image classification using Convolutional Neural Networks

在线全文

学校读者我要写书评

暂无评论

Energy and AI 2022年第4期10卷 87-94页

作者： Rathziel Roncancio Aly el Gamal Jay p.Gore School of Mechanical Engineering Purdue UniversityWest LafayetteIN47907USA School of electrical and Computer Engineering Purdue UniversityWest LafayetteIN 47907USA

pockets of unburned material in turbulent premixed flames burning CHs,air,and CO_(2) were studied using OH planar Laser-Induced Fuorescence(pLIF)images to improve current *** flames are ubiquitous in most natural gas air combustors running gas turbines with dry exhaust gas recirculation(EGR)for land-based power *** improvements continue in the charactenization and understanding of turbulent flames with EGR particularly for transient events like ignition and *** and/or islands of unburned material within bumed and unburned turbulent media are some of the features of these *** features reduce the heat release rates and increase the carbon monoxide and hydrocarbons *** present work involves Convolutional Neural Networks(CNN)based dassification of pIF images containing unburned pockets in three turbulent flames with 0%,5%,and 10%CO_(2).The CNN model was constructed using three convolutional layers and two fully connected layers using dropout and weight *** of 94.2%,92.3%and 89.2%were registered for the three flames,*** present approach represents significant computational time savings with respect to conventional image processing methods.

关键词： CNN Flame Neural network Turbulent

Geomorphological monitoring of a highly dynamic estuary using oblique aerial photographs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2009年第2期2卷 109-121页

作者： I.Abou el-Magd p.F.Hillman National Authority for remote sensing and Space Sciences CairoEgypt Gifford Carlton HaneSouthamptonUK588 Booth Street OttawaOntarioCanada

Bad weather in many countries limits the use of optical satellite imageries in spatial and temporal monitoring of the *** this paper,a series of lowaltitude oblique aerial photos taken on daily,weekly and monthly intervals were used to monitor the geomorphological changes in the upper part of the Mersey Estuary,northwestern *** low-altitude aerial photo methodology reveals itself to be a satisfying compromise between cost,accuracy and difficulty of *** offered a large amount of information on a spatial and temporal scale aiding in the understanding of channel *** was an important consideration in the sitting and installation of new bridge pier *** series of oblique aerial photos was used in a dynamic model to determine the migration of the ebb channel and was effective in identifying the main route of *** uncertainties were encountered and the level of accuracy achieved in resolving these uncertainties in the images was in the range from 40 cm to a maximum of 1.7 *** was compared with historical navigation charts and showed good *** applications are required to improve the quality of the data output from these images and the development of the technique.

关键词： geomorphology estuary GIS modelling oblique aerial photography,UK

Investigation of Microstructure, Microhardness and Thermal properties of Ag-In Intermetallic Alloys prepared by Vacuum Arc Meltings

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 Wuhan University of Technology(Materials Science) 2024年第1期39卷 182-187页

作者： ÇelİK Erçevik ATA ESENER pınar ÖZTÜRK Esra AKSÖZ Sezen Nevşehir HacıBektaşVeli University Department of Physics50300NevşehirTurkey Erciyes University Graduate School of Natural and Applied Sciences38039KayseriTurkey Kocaeli University Department of Physics41380KocaeliTurkey

Ag-In intermetallic alloys were produced by using vacuum arc furnace. Differential Scanning Calorimetry(DSC) and Energy Dispersive X-Ray Spectrometry(EDX) were used to determine the thermal properties and chemical composition of the phases respectively. Microhardness values of Ag-In intermetallics were calculated with Vickers hardness measurement method. According to the experimental results, Ag-34 wt%In intermetallic system generated the best results of energy saving and storage compared to other intermetallic systems. Also from the microhardness results, it was observed that intermetallic alloys were harder than pure silver and Ag-26 wt%In system had the highest microhardness value with 143.45 kg/mm^(2).

关键词： thermal properties microstructure characterization microhardness alloys material characterization

Evaluation of the updated definition of early allograft dysfunction in donation after brain death and donation after cardiac death liver allografts

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & pancreatic Diseases International 2012年第4期11卷 372-376页

作者： kris p Croome William Wall Douglas Quan Sai Vangala Vivian McAlister paul Marotta Roberto Hernandez-Alejandro Multi-Organ Transplant program London Health Sciences CentreThe University of Western OntarioLondonCanada Department of Surgery Division of General SurgeryThe University of Western OntarioLondonCanada Division of Gastroenterology The University of Western OntarioLondonCanada

BACKGROUND:An updated definition of early allograft dysfunction(EAD) was recently validated in a multicenter study of 300 deceased donor liver transplant *** analysis did not differentiate between donation after brain death(DBD) and donation after cardiac death(DCD) allograft ***:We reviewed our prospectively entered database for all DBD(n=377) and DCD(n=38) liver transplantations between January 1,2006 and October 30,*** incidence of EAD as well as its ability to predict graft failure and survival was compared between DBD and DCD ***:EAD was a valid predictor of both graft and patient survival at six months in DBD allograft recipients,but in DCD allograft recipients there was no significant difference in the rate of graft failure in those with EAD(11.5%) compared with those without EAD(16.7%)(p=0.664) or in the rate of death in recipients with EAD(3.8%) compared with those without EAD(8.3%)(p=0.565).The graft failure rate in the first 6 months in those with international normalized ratio ≥1.6 on day 7 who received a DCD allograft was 37.5% compared with 6.7% for those with international normalized ratio p=0.022).CONCLUSIONS:The recently validated definition of EAD is a valid predictor of patient and graft survival in recipients of DBD *** initial assessment,it does not appear to be a useful predictor of patient and graft survival in recipients of DCD allografts,however a study with a larger sample size of DCD allografts is needed to confirm these *** high ALT/AST levels in most recipients of DCD livers as well as the predisposition to biliary complications and early cholestasis make these parameters as poor predictors of graft *** alternative definition of EAD that gives greater weight to the INR on day 7 may be more relevant in this population.

关键词： donor risk index model for end-stage liver disease early allograft dysfunction donation after brain death

QT-GWAS:A novel method for unveiling biosynthetic loci affecting qualitative metabolic traits

在线全文

学校读者我要写书评

暂无评论

Molecular plant 2023年第7期16卷 1212-1227页

作者： Marlies Brouckaert Meng peng RenéHofer lias el Houari Chiarina Darrah Veronique Storme Yvan Saeys Ruben Vanholme Geert Goeminne Vitaliy I.Timokhin John Ralph kris Morreel Wout Boerjan Ghent University Department of Plant Biotechnology and Bioinformatics9000 GhentBelgium VIB Center for plant Systems Biology 9052 GhentBelgium Ghent University Department of Applied MathematicsComputer Science and Statistics9000 GhentBelgium VIB Center for Inflammation Research 9052 GhentBelgium vIB Metabolomics Core 9052 GhentBelgium Department of Biochemistry and US Department of Energy Great Lakes Bioenergy Research CenterWisconsin Energy InstituteUniversity of Wisconsin-MadisonMadisonWI53706USA Ghent University Department of Applied MathematicsComputer Science and StatisticsGhentBelgium ViB Center for Inflammation Research GhentBelgium BioNTech SE MainzRhineland-PalatinateGermany Eunomia Research&Consulting BristolUK VIB Agro-incubator NeveleBelgium Research Institute for Chromatography KortrijkBelgium

Although the plant kingdom provides an enormous diversity of metabolites with potentially beneficial applications for humankind,a large fraction of these metabolites and their biosynthetic pathways remain *** metabolite structures and their biosynthetic pathways is key to gaining biological understanding andto allow metabolic *** orderto retrieve novel biosynthetic genes involved in specialized metabolism,we developed a novel untargeted method designated as qualitative trait GWAs(QT-GWAS)that subjects qualitative metabolic traits to a genome-wide association study,while the conventional metabolite GWAS(mGWAS)mainly considers the quantitative variation of *** a proof of the validity of QT-GWAS,23 and 15of the retrieved associations identified in Arabidopsis thaliana by QTGWAS and mGWAS,respectively,were supported by previous ***,seven genemetabolite associations retrieved by QT-GWAS were confirmed in this study through reverse genetics combined with metabolomics and/or in vitro enzyme *** such,we established that CYTOCHROME p450706A5(CYp706A5)is involved in the biosynthesis of chroman derivatives,UDp-GLYCOSYLTRANSFERASE 76C3(UGT76C3)is able tohexosylate guanine in vitro and in planta,and SULFOTRANSFERASE 202B1(SULT202B1)catalyzes the sulfation of neolignans in ***,our study demonstrates that the untargeted QT-GWAS method can retrieve valid gene-metabolite associations at the level of enzyme-encoding genes,even new associations that cannot be found by the conventional mGwAs,providing a new approach for dissecting qualitative metabolic traits.

关键词： qualitative method proof

electrical Conductivity of Sintered Chromia Mixed with TiO_2,CuO and Mn-Oxides

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 Materials Science & Technology 2006年第2期22卷 245-251页

作者： K.el-Menshawy H.p.Buchkremer F.Tietz D.Stoever Metallurgy Dept. Atomic Energy Authority CairoEgypt Institute for Materials and processes in Energy Systems IWV-1 Forschungszentrum Juelich GmbH JuelichGermany Institute for Materials and processes in Energy Systems IWV-1 Forschungszentrum Juelich GmbH Juelich Germany

The electrical conductivity of sintered Cr2O3 mixed with 2% and 5% （in molar fraction） TiO2 or CuO was investigated in the temperature range 500-900℃ in air and in At/4 vol. pct H2 atmospheres. The effect of different Mn-oxides on the electrical conductivity of Cr2O3 was also studied under the same conditions. From the conductivity measurements it is established that additions of TiO2 change the defect structure of Cr2O3 and the effect of TiO2 on the electrical conductivity is controlled by TiO2 concentration as well as temperature and O2 partial pressure of the surrounding atmosphere. The conductivity of Cr2O3 increased in air and decreased in the At/H2 atmosphere by CuO additions. The effect of CuO was discussed with possible changes in the defect concentration in Cr2O3. Mixing of Cr2O3 with different Mn-oxides at the same Mn to metal atom fraction decreased the conductivity in air and in Ar/H2 atmospheres. No clear correlation between the spinel fraction and the changes in conductivity could be found.

关键词： electrical conductivity Cr2O3 Mixing with TiO2 CuO Mn-oxides

Advanced Functional electromagnetic Shielding Materials:A Review Based on Micro‑Nano Structure Interface Control of Biomass Cell Walls

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 98-134页

作者： Yang Shi Mingjun Wu Shengbo Ge Jianzhang Li Anoud Saud Alshammari Jing Luo Mohammed A.Amin Hua Qiu Jinxuan Jiang Yazeed M.Asiri Runzhou Huang Hua Hou Zeinhom M.el‑Bahy Zhanhu Guo Chong Jia Kaimeng Xu Xiangmeng Chen Co‑Innovation Center of Efficient processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China State Key Laboratory of Efficient production of Forest Resourced Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083People’s Republic of China Department of physics Faculty of Sciences‑ArarNorthern Border UniversityArar 91431Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr CityCairo 11884Egypt Yunnan provincial Key Laboratory of Wood Adhesives and Glued products International Joint Research Center for Biomass MaterialsSouthwest Forestry UniversityKunming 650224People’s Republic of China School of Science Henan Agricultural UniversityZhengzhou 450002People’s Republic of China

Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass *** materials offer numerous advantages such as being lightweight,porous,and *** to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EMI shielding *** concerted efforts on the EMI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EMI shielding *** particular,a more comprehensive study and summary of the factors influencing biomass EMI shielding materials including the pore structure adjustment,preparation process,and micro-control would be *** preparation methods and characteristics of wood,bamboo,cellulose and lignin in EMI shielding field are critically discussed in this paper,and similar biomass EMI materials are summarized and *** composite methods and fillers of various biomass materials were *** paper also highlights the mechanism of EMI shielding as well as existing prospects and challenges for development trends in this field.

关键词： Biomass materials electromagnetic interference shielding Micro-nano structure interface control Conductivity

Improved Supervised and Unsupervised Metaheuristic-Based Approaches to Detect Intrusion in Various Datasets

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第10期137卷 265-298页

作者： Ouail Mjahed Salah el Hadaj el Mahdi el Guarmah Soukaina Mjahed Faculty of Sciences and Technology Department of Computer SciencesCadi Ayyad UniversityMarrakech40000Morocco Mathematics and Informatics Department Royal Air SchoolMarrakech40000Morocco

Due to the increasing number of cyber-attacks,the necessity to develop efficient intrusion detection systems(IDS)is more imperative than *** IDS research,the most effectively used methodology is based on supervised Neural Networks(NN)and unsupervised clustering,but there are few works dedicated to their hybridization with metaheuristic *** intrusion detection data usually contains several features,it is essential to select the best ones *** Discriminant Analysis(LDA)and t-statistic are considered as efficient conventional techniques to select the best features,but they have been little exploited in IDS ***,the research proposed in this paper can be summarized as follows.a)The proposed approach aims to use hybridized unsupervised and hybridized supervised detection processes of all the attack categories in the CICIDS2017 ***,owing to the large size of the CICIDS2017 Dataset,only 25%of the data was used.b)As a feature selection method,the LDAperformancemeasure is chosen and combinedwith the t-statistic.c)For intrusion detection,unsupervised Fuzzy C-means(FCM)clustering and supervised Back-propagation NN are adopted.d)In addition and in order to enhance the suggested classifiers,FCM and NN are hybridized with the seven most known metaheuristic algorithms,including Genetic Algorithm(GA),particle Swarm Optimization(pSO),Differential Evolution(DE),Cultural Algorithm(CA),Harmony Search(HS),Ant-Lion Optimizer(ALO)and Black Hole(BH)*** metrics extracted from confusion matrices,such as accuracy,precision,sensitivity and F1-score are *** experimental result for the proposed intrusion detection,based on training and test CICIDS2017 datasets,indicated that pSO,GA and ALO-based NNs can achieve promising ***-NN produces a tested accuracy,global sensitivity and F1-score of 99.97%,99.95%and 99.96%,respectively,outperforming performance concluded in several related ***,the best-p

关键词： Classification neural networks Fuzzy C-means metaheuristic algorithm CICIDS2017 intrusion detection system