检索结果-南通市图书馆

Zeolitic germanosilicate analogue to pharmacosiderite crystallized in an acidic medium

在线全文

学校读者我要写书评

暂无评论

Green Carbon 2023年第2期1卷 185-192页

作者： Guangying Fu Qiaolin Lang Xiaolong Liu Haonuan Zhao Yiqing Sun Lei Zhao ahmed omran Peng Lu Xiaobo Yang Bing Yu Valentin Valtchev The ZeoMat Group Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of ScienceLaoshan District266101 QingdaoChina College of Chemistry and Chemical Engineering Qingdao University266071 QingdaoChina Normandie University ENSICAENUNICAENCNRSLaboratoire Catalyse et SpectrochimieF-14000 CaenFrance

Zeolites are typically synthesized in alkaline or fluoride-containing near-neutral *** organic structure-directing agents have been investigated for such systems with the aim of discovering materials with unprecedented structures and properties for novel technical *** contrast,zeolite crystallization in strongly acidic media has yet to be *** study demonstrates that a zeolitic silicate phase crystallizes from acidic gels using trimethylamine as an organic additive with the composition 1 SiO_(2):0.3 TMA:0.3 HCl:0.15 HF:55 H_(2)O:(0.1-0.4)GeO_(2).This phase has an interrupted four-connected framework analog to the octahedron/tetrahedron-mixed framework of the mineral family *** comparison to the pharmacosiderite-type HK_(3)(Ge_(7)O_(16))(H_(2)O)_(4),the four GeO_(6)-octahedra forming the central[HGe_(4)O_(4)O_(12)]-cluster are replaced by four SiO_(4)-tetrahedra in a[Si_(4)O_(6)(OH)2.89]-unit in the new ***,the structure is distorted and may contain connectivity and point defects;thus,healing by the occasional incorporation of GeO_(6)-units is *** refined unit cell has a cubic symmetry,space group P-43m(#215),with a=7.7005(1)Å.Acidic-medium synthesis is a useful way to find new zeolites that move in a fundamentally different direction from sophisticated organic structure-directing agents.

关键词： Zeolite synthesis in acidic medium New germanosilicate zeolite 4-connected analogue of pharmacosiderite Structure analysis Structure-directing agents

A Content-Based Medical Image Retrieval Method Using Relative Difference-Based Similarity Measure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第8期37卷 2355-2370页

作者： Ali ahmed Alaa omran Almagrabi Omar MBarukab Department of Computer Science Faculty of Computing and Information TechnologyKing Abdulaziz University–RabighRabigh21589Saudi Arabia Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Information Technology Faculty of Computing and Information TechnologyKing Abdulaziz University-RabighRabigh21589Saudi Arabia

Content-based medical image retrieval(CBMIR)is a technique for retrieving medical images based on automatically derived image *** are many applications of CBMIR,such as teaching,research,diagnosis and electronic patient *** methods are applied to enhance the retrieval performance of CBMIR *** new and effective similarity measure and features fusion methods are two of the most powerful and effective strategies for improving these *** study proposes the relative difference-based similarity measure(RDBSM)for *** new measure was first used in the similarity calculation stage for the CBMIR using an unweighted fusion method of traditional color and texture ***,the study also proposes a weighted fusion method for medical image features extracted using pre-trained convolutional neural networks(CNNs)*** proposed RDBSM has outperformed the standard well-known similarity and distance measures using two popular medical image datasets,Kvasir and PH2,in terms of recall and precision retrieval *** effectiveness and quality of our proposed similarity measure are also proved using a significant test and statistical confidence bound.

关键词： Medical image retrieval feature extraction similarity measure fusion method

Structural, electronic, elastic, and thermal properties of CaNiH3 perovskite obtained from first-principles calculations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第3期27卷 384-390页

作者： S Benlamari H Bendjeddou R Boulechfar SAmara Korba H Meradji R ahmed S Ghemid R Khenata S Bin omran Laboratoire LPR Departement de Physique Faculté des Sciences Université Badji Mokhtar Annaba Algeria Department of Physics Faculty of Science Universiti Teknologi Malaysia UTM Skudai 81310 Johor Malaysia Laboratoire de Physique Quantique et de Modelisation Mathematique de la Matiere (LPQ3M) Universite de Mascara-29000-Algeria Department of Physics and Astronomy College of Science King Sand University P.O. Box 2455 Riyadh 11451 Saudi Arabia

A theoretical study of the structural, elastic, electronic, mechanical, and thermal properties of the perovskite-type hydride CaNiH3 is presented. This study is carded out via first-principles full potential （FP） linearized augmented plane wave plus local orbital （LAPW＋lo） method designed within the density functional theory （DFT）. To treat the exchange-correlation energy/potential for the total energy calculations, the local density approximation （LDA） of Perdew-Wang （PW） and the generalized gradient approximation （GGA） of Perdew-Burke-Ernzerhof （PBE） are used. The three independent elastic constants （C11, C12, and C44） are calculated from the direct computation of the stresses generated by small strains. Besides, we report the variation of the elastic constants as a function of pressure as well. From the calculated elastic constants, the mechanical character of CaNiH3 is predicted. Pertaining to the thermal properties, the Debye temperature is estimated from the average sound velocity. To further comprehend this compound, the quasi-harmonic Debye model is used to analyze the thermal properties. From the calculations, we find that the obtained results of the lattice constant （ao）, bulk modulus （Bo）, and its pressure derivative （B0′） are in good agreement with the available theoretical as well as experimental results. Similarly, the obtained electronic band structure demonstrates the metallic character of this perovskite-type hydride.

关键词： perovskite-type hydrides elastic constants hydrogen storage materials

Implementation of a Petrographical and Petrophysical Workflow Protocol for Studying the Impact of Heterogeneity on the Rock Typing and Reservoir Quality of Reefal Limestone:A Case Study on the Nullipore Carbonates in the Gulf of Suez

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2021年第5期95卷 1746-1762页

作者： Mona G.SAFA Bassem S.NABAWY ahmed M.K.BASAL Mohammad A.omran Aref LASHIN Geology Department Faculty of ScienceDamietta UniversityNew Damietta CityEgypt Department of Geophysical Sciences National Research CentreDokkiCairoEgypt Petroleum and Natural Gas Engineering Department College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia Benha University Faculty of ScienceGeology DepartmentBenhaEgypt

This study focuses on the heterogeneity of the middle Miocene syn-rift Belayim nullipore(reefal)marine sequences in the Gulf of Suez and its impacts on reservoir *** sequences consist of coralline algal reef limestones with a highly complex dual-porosity system of primary and secondary porosities of widely varying *** achieve a precise mathematical modeling of these reservoir sequences,a workflow protocol was applied to separate these sequences into a number of hydraulic flow units(HFUs)and reservoir rock types(RRTs).This has been achieved by conducting a conventional core analysis on the nullipore marine *** illustrate the heterogeneity of the nullipore reservoir,the Dykstra-Parsons coefficient(V)has been estimated(V=0.91),indicating an extremely heterogeneous reservoir.A slight to high anisotropy(λ_(k))has been assigned for the studied nullipore sequences.A stratigraphic modified Lorenz plot(SMLP)was applied to define the optimum number of HFUs and barriers/baffles in each of the studied *** the permeability-porosity,reservoir quality index-normalized porosity index(RQI-NPI)and the RQI-flow zone indicator(RQIFZI)plots,the discrete rock types(DRT)and the R35 techniques enable the discrimination of the reservoir sequences into 4 RRTs/*** RRT4 packstone samples are characterized by the best reservoir properties(moderate permeability anisotropy,with a good-to-fair reservoir quality index),whereas the RRT1 mudstone samples have the lowest flow and storage capacities,as well as the tightest reservoir quality.

关键词： reservoir heterogeneity nullipore rock typing hydraulic flow units Dykstra-Parsons coefficient stratigraphic modified Lorenz plot(SMLP)

Assessment of circulating levels of microRNA-326,microRNA-424,and microRNA-511 as biomarkers for hepatocellular carcinoma in Egyptians

在线全文

学校读者我要写书评

暂无评论

World Journal of Hepatology 2022年第8期14卷 1562-1575页

作者： Samar Samir Youssef Asmaa Elfiky Mohamed M Nabeel Hend Ibrahim Shousha Tamer Elbaz Dalia omran Mohammad Saeed Marie Mohammad A Elzahry Amr Abul-Fotouh ahmed Hashem Mohamed F Guda Ashraf O Abdelaziz Department of Microbial Biotechnology National Research CentreCairo 1211Egypt Department of Environmental and Occupational Medicine National Research CentreCairo 1211Egypt Department of Endemic Medicine and Hepatogastroenterology Faculty of MedicineCairo UniversityCairo 11562 Egypt Department of Endemic Medicine Faculty of MedicineCairo UniversityCairo 1256Egypt Theodor Bilharz Research Institute Cairo 1256Egypt

BACKGROUND Hepatocellular carcinoma(HCC)is the fifth most common *** expression of microRNAs(miRNAs)-326,miRNA-424,and miRNA-511 has been associated with the diagnosis and prognosis of HCC in different ***,limited information is available regarding their expression in Egyptian HCC *** To assess the role of circulating miRNAs-326,miRNA-424,and miRNA-511 in Egyptian HCC *** This prospective observational study included 70 HCC patients and 25 healthy *** circulating levels of these three miRNAs were evaluated by real-time *** operating characteristic curve analysis was used to test the diagnostic accuracy of micro RNA expression *** All miRNAs were differentially expressed in HCC patients;miRNAs326 and miRNA-424 were upregulated,while miRNA-511 was *** miRNA-326 and miRNA-424 showed sensitivity and specificity of 97%,71.4%,and 52%,60%,respectively,to differentiate HCC from ***,miRNA-326 was associated with survival and could differentiate between Child grades(A vs B);miRNA-424 significantly differentiated early vs intermediate stages of HCC;while miRNA-511 was significantly correlated with response to modified Response Evaluation Criteria in Solid Tumors(m RECIST).CONCLUSION We conclude that miRNA-326,miRNA-424,and miRNA-511 have diagnostic and prognostic roles in Egyptian patients with hepatitis C virus-related HCC and should be considered for better disease management.

关键词： Hepatocellular carcinoma miRNAs-326 miRNA-424 miRNA-511 Modified response evaluation criteria in solid tumors

Molecular characterization of Cysticercus tenuicollis of slaughtered livestock in Upper Egypt governorates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2016年第8期6卷 706-708页

作者： Mosaab Adl Eldin Omar Layla omran Elmajdoub Mohammad Saleh Al-Aboody ahmed Mahmoud Elsify ahmed Osman Elkhtam Abdelnasser A.Hussien Department of Parasitology Faculty of Veterinary Medicine South Valley University Zoology Department Misurata University Department of Medical Laboratories College of Science Al-Zulfi Majmaah University Department of Animal Medicine and Infectious Diseases Faculty of Veterinary Medicine Sadat City University Department of Parasitology Faculty or Veterinary Medicine University of Sadat City Zoology Department College of Science South Valley University

Objective: To present the molecular characterization of Cysticercus tenuicollis(C. tenuicollis) of Taenia hydatigena(T. hydatigena) from livestock isolates in Egypt, and to introduce a detailed image of C. tenuicollis infection in ruminant animals in Upper ***: The prevalence rates of C. tenuicollis infections among the slaughtered animals from different organs were determined using the amplification of sequencing of the MT-CO1 ***: In the present study the infection rates of C. tenuicollis were found to be 16%and 19% in sheep and goat samples respectively. Firstly we report one larval stage of T. hydatigena detected in the camel liver in Egypt. C. tenuicollis infection manifested a higher prevalence in females than in males. Those above two years of age manifested a higher infection rate than younger animals. The preferred site for the infection was the omentum: a 70% preference in sheep and a 68% preference in goats. The molecular characterization using the MT-CO1 gene of isolates from sheep, goats and camels corresponded to T. hydatigena. For this study, molecular characterizations of T. hydatigena were done for the first time in Egypt. Molecular tools are of great assistance in characterizing the C. tenuicollis parasite especially when the morphological character cannot be detected, because the metacestodes are frequently confused with infection by the hydatid cyst, especially when these occur in the visceral organs. In the present study,C. tenuicollis manifested high identity in the goat and sheep samples, while differences were found more frequently in the camel samples(10 base pair).Conclusions: Clearly molecular diagnosis for C. tenuicollis infection significantly helps to differentiate it from such other metacestodes as hydatidosis, which manifests a completely different pathogenicity and requires different control programs.

关键词： Cysticercus tenuicollis Taenia hydatigena Slaughtered animals Molecular characterization Egypt

Investigations of the half-metallic behavior and the magnetic and thermodynamic properties of half-Heusler CoMnTe and RuMnTe compounds: A first-principles study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第8期23卷 444-451页

作者： T.Djaafri A.Djaafri A.Elias G.Murtaza R.Khenata R.ahmed S.Bin omran D.Rached Department of Physics Faculty of Science Dr Tahar Moulay University Modeling Laboratory Department of Physics Islamia College Peshawar LPQ3M Laboratory Department of Physics Faculty of Science and Technology Mascara University Department of Physics Faculty of Science Universiti Teknologi MalaysiaUTM Skudai Department of Physics and Astronomy College of Science King Saud University Department of Physics Faculty of Science Djillali Liabes University

First-principles spin-polarized density functional theory （DFT） investigations of the structural, electronic, magnetic, and thermodynamics characteristics of the half-Heusler, CoMnTe and RuMnTe compounds are carried out. Calculations are accomplished within a state of the art full-potential （FP） linearized （L） augmented plane wave plus a local orbital （APW ＋ lo） computational approach framed within DFT. The generalized gradient approximation （GGA） parameterized by Perdew, Burke, and Ernzerhof （PBE） is implemented as an exchange correlation functional as a part of the total energy calculation. From the analysis of the calculated electronic band structure as well as the density of states for both compounds, a strong hybridization between d states of the higher valent transition metal （TM） atoms （Co, Ru） and lower valent TM atoms of （Mn） is observed. Furthermore, total and partial density of states （PDOS） of the ground state and the results of spin magnetic moments reveal that these compounds are both stable and ideal half-metallic ferromagnetic. The effects of the unit cell volume on the magnetic properties and half-metaliicity are crucial. It is worth noting that our computed results of the total spin magnetic moments, for CoMnTe equal to 4 ~tB and 3 p-B per unit cell for RuMnTe, nicely follow the rule μ2tot = Zt - 18. Using the quasi-harmonic Debye model, which considers the phononic effects, the effecs of pressure P and temperature T on the lattice parameter, bulk modulus, thermal expansion coefficient, Debye temperature, and heat capacity for these compounds are investigated for the first time.

关键词： half-Heusler alloys half-metallic behavior magnetism thermodynamic properties first principlesmethods

Spinal cord injury regeneration using autologous bone marrowderived neurocytes and rat embryonic stem cells:A comparative study in rats

在线全文

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2020年第12期12卷 1591-1602页

作者： Mir Sadat-Ali Dakheel A Al-Dakheel Ayesha ahmed Haifa A Al-Turki Abdallah S Al-omran Sadananda Acharya Methal I Al-Bayat Department of Orthopedic Surgery Imam Abdulrahman Bin Faisal University and King Fahd Hospital of the UniversityDammam 31952Saudi Arabia Department of Orthopedic Surgery Imam Abdulrahman Bin Faisal UniversityAlKhobar 31952Saudi Arabia Department of Pathology Imam Abdulrahman Bin Faisal UniversityDammam 31952Saudi Arabia Department of Obstetrics and Gynecology Imam Abdulrahman Bin Faisal UniversityDammam 31142Saudi Arabia Department of Orthopedic Surgery Imam Abdulrahman Bin Faisal University and King Fahd Hospital of the UniversityAlKhobar 31952Saudi Arabia Department of Public Health College of Public HealthImam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia

BACKGROUND Spinal cord injury(SCI)is an important cause of traumatic paralysis and is mainly due to motor vehicle ***,there is no definite treatment for spinal cord *** To assess the outcome of rat embryonic stem cells(rESC)and autologous bone marrow-derived neurocytes(ABMDN)treatment in iatrogenic SCI created in rats,and to compare the efficacy of the two different cell *** The study comprised 45 male Wistar rats weighing between 250 and 300 g,which were divided into three groups,the control,rESC and ABMDN *** anesthetized animals underwent exposure of the thoracic 8th to lumbar 1st vertebrae.A T10-thoracic 12th vertebrae laminectomy was performed to expose the spinal cord.A drop-weight injury using a 10 g weight from a height of 25 cm onto the exposed spinal cord was *** wound was closed in *** urinary bladder was manually evacuated twice daily and after each evacuation Ringer lactate 5 mL/100 g was administered,twice daily after each bladder evacuation for the first 7 postoperative *** the 10th day,the rats underwent nerve conduction studies and behavioral assessment[Basso,Beattie,Brenham(BBB)]to confirm *** embryonic stem cells,ABMDN and saline were injected on the 10th *** animals were euthanized after 8 wk and the spinal cord was isolated,removed and placed in 2%formalin for histopathological analysis to assess the healing of neural tissues at the axonal *** All the animals tolerated the procedure *** BBB scale scoring showed that at the end of the first week no recovery was observed in the ***-injection,there was a strong and significant improvement in rats receiving rESC and ABMDN as compared to the control group based on the BBB scale,and the Trainof-four-Watch SX acceleromyography device exhibited statistically significant(P<0.0001)regeneration of neural tissue after *** evaluation of the spinal cord showed maximum vacuolization and least gliosis i

关键词： Spinal cord injury Regeneration Embryonic stem cells Autologous bone marrow-derived neurocytes Iatrogenic Stem cells

Evaluation of Waterlogged Areas in El-Farafra Oasis, Egypt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Soil Science 2019年第11期9卷 232-242页

作者： ahmed Ibrahim Mohamed El-Sayed Ewis omran Soil and Water Department Faculty of Agriculture Suez Canal University Ismailia Egypt

A geographic information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present all types of geographical data. The key word to this technology is Geography—this means that some portion of the data is spatial. In other words, data that is in some way referenced to locations on the earth. The goal of this study is to evaluate how precisely waterlogging can be identified from medium-goals satellite pictures utilizing EWIS list. The point is to distinguish and mapping of the waterlogged territories in the piece of Farafra Desert Oasis of Egypt. To complete this identification, Landsat-8 symbolism and geographical sheets (1:50,000) have been utilized and handling through Envi 5.3 and Circular segment GIS 10.3, with field perceptions. The waterlogged regions have positive change (+), anyway grounds have negative change (−). Land has been diminished while water bodies have upward pattern. These waterlogged zones have been mapped at a general exactness of 99.22%. The primary explanations behind this descending rate are mostly improvement and anthropogenic mediations. The investigation shows utility of reconciliation of remote detecting and GIS systems for evaluation of waterlogged territories especially in districts where waterlogging conditions happen both because of over the top water system and poor waste. This investigation is recommended that an appraisal of water logging utilizing remotely detected information ought to be completed at customary interims.

关键词： Waterlogged Farafra Desert Oasis Egypt Landsat-8 GIS