检索结果-南通市图书馆

纯相和镍取代的Co_3O_4尖晶石催化剂用于N_2O直接分解(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

催化学报 2014年第7期35卷 1105-1112页

作者： Bahaa M.Abu-Zied soliman a.soliman Sarah E.Abdellah Chemistry Department Faculty of ScienceAssiut University

A series of NixCo1-xCo2O4(0 ≤ x ≤ 1) spinel catalysts were prepared by the co-precipitation method and used for direct N2O decomposition. The decomposition pathway of the parent precipitates was characterized by thermal analysis. The catalysts were calcined at 500 °C for 3 h and characterized by powder X-ray diffraction, Fourier transform infrared, and N2 adsorption-desorption. Nickel cobaltite spinel was formed in the solid state reaction between NiO and Co3O4. The N2O decomposition measurement revealed significant increase in the activity of Co3O4 spinel oxide catalyst with the partial replacement of Co2+ by Ni2+. The activity of this series of catalysts was controlled by the degree of Co2+ substitution by Ni2+, spinel crystallite size, catalyst surface area, presence of residual K+, and calcination temperature.

关键词：氧化物催化剂四氧化三钴尖晶石型直接分解 N2O 镍氧化亚氮二氧化碳

Silicon-mediated highly efficient synthesis of 1,8-dioxo-octahydroxanthenes and their transformation to novel functionalized pyrano-tetrazolo[1,5-a]azepine derivatives

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第5期24卷 404-406页

作者： Hanan a.soliman Tarek A.Salama Photochemistry Department National Research Center Chemistry Department Faculty of ScienceMansoura University

A facile and highly efficient protocol for the synthesis of 1,8-dioxo-octahydroxanthene derivatives was achieved through cascade Knoevenagel-Michael condensations and cyclo-dehydration reaction utilizing tetrachlorosilane（TCS） as catalyst under mild *** of the titled compounds with TCSNaN_3 to give novel functionalized pyrano[3,2-c]tetrazolo[1,5-a]azepine derivatives is also described.

关键词： Tetrachlorosilane 1,8-Dioxo-octahydroxanthenes Synthesis Tetrazoln[1,5-a]azepines

Ki-67 as a prognostic marker according to breast cancer molecular subtype

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2016年第4期13卷 496-504页

作者： Nahed a.soliman Shaimaa M.Yussif Department of Pathology Faculty of Medicine University of Helwan Department of Pathology Faculty of Medicine University of Mansoura

Objective: Ki-67 plays an important function in cell division, but its exact role is still unknown. Moreover, few works regarding its overall function were published. The present study evaluated the clinical significance of Ki-67 index as a prognostic marker and predictor of recurrence in different molecular subtypes of breast cancer. The relationship of Ki-67 index with different clinicopathological factors was also ***: Ki-67 index was measured in 107 cases of primary breast cancer from 2010-2012. These patients were evaluated for estrogen receptor, progesterone receptor, and HER2. Ki-67 was divided according to percentage levels: 15%. Followup ranged from 32 months up to 6 ***: Approximately 44, 23, 15, and 25 cases were grouped as luminal A, luminal B, HER2 subtype, and triple-negative(TN),respectively. No luminal A patients showed Ki-67 level higher than 15%, and their recurrence was 20%. In luminal B group, Ki-67 level higher than 15% was observed in 69% of patients, and recurrence was 39%. In HER2 subtype, Ki-67 was higher than 15% in34% of cases, and recurrence was 40%. In triple-negative cases, Ki-67 was higher than 15% in 60% of cases, and recurrence was detected in 32% of patients. Patients with Ki-67 less than 15% displayed better overall survival than those with Ki-67 higher than15%(P = 0.01). Patients with Ki-67 higher than 15% exhibited higher incidence of metastasis and recurrence than those with Ki-67 less than 15%(P = 0.000).Conclusions: Ki-67 may be considered as a valuable biomarker in breast cancer patients.

关键词： Ki-67 prognostic molecular subtypes breast cancer

A spatiotemporal algebra in Hadoop for moving objects

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2018年第2期21卷 102-114页

作者： Mohamed S.Bakli Mahmoud A.Sakr Taysir Hassan a.soliman Faculty of Computers and Information Assiut UniversityAssiutEgypt Faculty of Computer and Information Sciences Ain Shams UniversityCairoEgypt Universitélibre de Bruxelles BruxellesBelgium

Spatiotemporal data represent the real-world objects that move in geographic space over *** enormous numbers of mobile sensors and location tracking devices continuously produce massive amounts of such *** leads to the need for scalable spatiotemporal data management *** systems shall be capable of representing spatiotemporal data in persistent storage and in *** shall also provide a range of query processing operators that may scale out in a cloud ***,very few researches have been conducted to meet this *** paper proposes a Hadoop extension with a spatiotemporal *** algebra consists of moving object types added as Hadoop native types,and operators on top of *** Hadoop file system has been extended to support parameter passing for files that contain spatiotemporal data,and for operators that can be unary or *** the types and operators are accessible for the MapReduce *** an extension allows users to write Hadoop programs that can perform spatiotemporal *** queries may call more than one operator for different jobs and keep these operators running in *** paper describes the design and implementation of this algebra,and evaluates it using a benchmark that is specific to moving object databases.

关键词： Spatiotemporal algebra Hadoop MapReduce moving objects

An efficient synthesis of bis(indolyl)methanes and N,N'-alkylidene bisamides by Silzic under solvent free conditions

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 Chemical Letters 2016年第3期27卷 353-356页

作者： Hanan a.soliman Ahmed Y.Mubarak Saad S.Elmorsy Photochemistry Department National Research Centre Chemistry Department Faculty of ScienceMansoura University

An operationally simple and green method for the synthesis of a wide range of bis（indolyl）methanes,and N,N＇-alkylidene bisamides under mild conditions,with excellent yields using Silzic,has been *** improved method furnishes in good yields bis（indolyl）methanes derivatives starting from indole and aldehydes,or ketones,and N,N＇-alkylidene bisamides derivatives starting from acetamide and *** catalytic system was reused up to three times with the same efficiency.

关键词： Bis(indolyl)methanes N N'-alkylidenebisamides Acetamide Mild conditions Silzic

Utilization of bromine azide to access vicinal-azidobromides from arylidene malononitrile

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第9期27卷 1515-1518页

作者： Hanan a.soliman Tamer K.Khatab Farouk M.E.Abdel-Megeid Photochemistry Department National Research Centre Organometallic and Organometalloid Chemistry Department National Research Centre

An efficient and facile approach for tetrachlorosilane as an in situ mediated transformation via a one-pot, synthesis of vicinal bromoazides through the generation of BrN3 from azidochlorosilane and N-bromosuccinimide in acetonitrile as solvent at ambient temperature is achieved. This catalytic process represents a highly regioselective and high yielding method for the synthesis of 1,2- bromoazides. Thiamine pyrophosphate （TPP） riboswitches regulate essential genes in bacteria by changing conformation upon binding intracellular TPP. Molecular docking studies are conducted to understand the orientation and the interaction of each synthesized molecules with TPP riboswitches, 2016 Chinese Chemical Society and Institute of Materia Medica, Chinese Academv of Medical Sciences.

关键词： Azidobromination Tetrachlorosilane Arylidene malononitrile Sodium azide N-Bromosuccinimide

Construction of Customized Bio Incubator and Designing of Tailored Scaffolds for Bone Tissue Engineering from Laboratory Scale Up to Clinical Scale

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2022年第11期10卷 2699-2716页

作者： soliman Abdalla Shiref Kandil Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia Department of Materials Science Institute of Graduate Studies and ResearchAlexandria UniversityAlexandriaEgypt

In order to obtain larger,clinical-scale and practical-scale bone grafts,we have designed both tailored scaffolds and tailored bio incubator with optimal bio-production *** DIC files to Simpleware Scan-IP(Simple-ware-exeter United Kingdom),we have digitally reconstructed segmental additive bone-tissue in order to perform images *** hydroxyapatite and tannin composites have been used in order to get the final bone modules combined for retexturing of segmental bone *** have found that sectioning of bone segment deficiency reorganizations into well disk-shaped design permits one to standardize the cell culture and seeding protocol,to get better *** present study concludes that some techniques with cultured cell in segmental bone grafts in the laboratory can be transferred and clinically used.

关键词： Repairing segmental bone customized scaffolds stem cells designing bio incubator bone engineering

Continuous query scheduler based on operators clustering

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 Central South University 2011年第3期18卷 782-790页

作者： M.Sami soliman 谭冠政 School of Information Science and Engineering Central South University

Data stream management system (DSMS) provides convenient solutions to the problem of processing continuous queries on data *** approaches for scheduling these queries and their operators assume that each operator runs in separate thread or all operators combine in one query plan and run in a single *** approaches suffer from severe drawbacks concerning the thread overhead and the stalls due to expensive *** overcome these drawbacks,a novel approach called clustered operators scheduling (COS) is proposed that adaptively clusters operators of the query plan into a number of groups based on their selectivity and computing cost using S-mean *** evaluation is provided to demonstrate the potential benefits of COS scheduling over the other scheduling *** can provide adaptive,flexible,reliable,scalable and robust design for continuous query processor.

关键词： data stream management systems operators scheduling continuous query clustering

Patterns of reproduction in two sympatric gerbil species in arid Egypt

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2009年第2期4卷 248-253页

作者： Sohail soliman Eman M.MOHALLAL Department of Zoology Faculty of ScienceAin Shams UniversityAbbasiyaCairoEgypt Desert Research Centre MatariyaCairoEgypt

Despite a significant number of studies on the reproductive characteristics of small mammals,very little of this work has been conducted on species in ***,the Egyptian greater gerbil(Gerbillus pyramidum Saint-Hilaire,1825)and Anderson’s lesser Egyptian gerbil(Gerbillus andersoni De Winton,1902)in northeastern Egypt were *** behavior in these species was synchronized with rainfall in the winter and spring *** however,the removal of individual gerbils throughout the course of study resulted in an extension of reproductive activity into the dry summer and autumn months in the latter part of the *** results are discussed in the context of density-dependent reproductive behavior in small mammals.

关键词： compensation density dependent Egypt Gerbillus reproduction Sinai.