检索结果-南通市图书馆

多孔纳米结构Fe/Pt-Fe电极对碱性介质中甲醇电氧化的催化活性（英文）

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

催化学报 2015年第7期36卷 1029-1034页

作者： Javad hosseini Mehdi Abdolmaleki Hamid Reza Pouretedal mohammad hossein.keshavarz Department of Chemistry Malek-ashtar University of Technology Faculty of Science Department of ChemistrySayyed Jamaleddin Asadabadi University

An electrochemical approach to fabricate a nanostructured Fe/Pt-Fe catalyst through electrodeposition followed by galvanic replacement is presented. An Fe/Pt-Fe nanostructured electrode was prepared by deposition of Fe-Zn onto a Fe electrode surface, followed by replacement of the Zn by Pt at open-circuit potential in a Pt-containing alkaline solution. Scanning electron microscopy and energy-dispersive X-ray techniques reveal that the Fe/Pt-Fe electrode is porous and contains Pt. The electrocatalytic activity of the Fe/Pt-Fe electrode for oxidation of methanol was examined by cyclic voltammetry and chronoamperometry. The electrooxidation current on the Fe/Pt-Fe catalyst is much higher than that on flat Pt and smooth Fe catalysts. The onset potential and peak potential on the Fe/Pt-Fe catalyst are more negative than those on flat Pt and smooth Fe electrodes for methanol electrooxidation. All results show that this nanostructured Fe/Pt-Fe electrode is very attractive for integrated fuel cell applications in alkaline media.

关键词：电催化活性甲醇氧化纳米铁碱性介质铂电极多孔 Fe催化剂扫描电子显微镜

碳基固体酸催化剂上无溶剂条件下酮和芳香醛交叉羟醛缩合反应

在线全文

学校读者我要写书评

暂无评论

催化学报 2008年第7期29卷 602-606页

作者： Abbas ZALI Kamal GHANI Arash SHOKROLAHI mohammad hossein.keshavarz Chemistry Department Malek-Ashtar University of Technology

Aromatic aldehydes undergo cross-aldol condensation with ketones in the presence of carbon-based solid acid under solvent-free conditions to afford the corresponding α,β-unsaturated aldol products in excellent yield... 详细信息

关键词：固体酸碳催化剂化学分析

Kinetics of magnetite oxidation under non-isothermal conditions

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第5期24卷 486-492页

作者： Aref Sardari Eskandar keshavarz Alamdari mohammad Noaparast Sied Ziaedin Shafaei Department of Mining Engineering Science and Research BranchIslamic Azad University Department of Mining and Metallurgical Engineering Amirkabir University of Technology School of Mining Engineering University of Tehran

Oxidation of magnetite concentrates, which occurs during the pellet induration process, must be deeply understood to enable the appropriate design of induration machines. In the present paper, the kinetics of the magnetite oxidation reaction was studied. Primary samples were obtained from the Gol-e-Gohar iron ore deposit. Magnetic separation and flotation decreased the sulfur content in the samples to be approximately 0.1wt%. Thermogravimetric analysis was used to measure mass changes during the oxidation of magnetite and, consequently, the conversion values. The aim of this study was to use isoconversional methods to calculate the kinetic parameters. The Coats-Redfern method was also used to obtain the activation energy. Thermogravimetric analyses were run at three different heating rates. The Coats-Redfern results were too ambiguous for a meaningful interpretation. In the case of the isoconversional method, however, the mean activation energy and pre-exponential factor of the oxidation reaction were obtained as 67.55 kJ and 15.32 × 108 min−1, respectively. Such a large activation energy implies that temperature strongly affects the reaction rate. The oxidation reaction exhibits a true multi-step nature that is predominantly controlled by chemical reaction and diffusion mechanisms.

关键词： magnetite kinetics oxidation thermogravimetric analysis

在线全文

学校读者我要写书评

暂无评论

Keto-RDX的合成及性能计算(英文)

含能材料 2008年第1期16卷 44-48页

作者： Arash Shokrollahi Abbas Zali Hamid Reza Pouretedal mohammad hossein.keshavarz Department of Chemistry Malek-ashtar University of TechnologyShahin-shahrIslamic Republic of Iran

Keto-RDX was obtained by one-step method with a certain amount of RDX as *** effects of various parameters on high yield were studied.A simple analytical method was also introduced to determine simultaneously Keto-RDX/RDX mole *** important theoretical characterizations of Keto-RDX such as detonation performance at maximum nominal density and shock sensitivity were determined by new methods and compared with RDX.

关键词：三次甲基三硝基胺酮类合成导数分光光度法撞击灵敏性气相生成热

Experimental investigation into L-Arg and L-Cys eco-friendly surfactants in enhanced oil recovery by considering IFT reduction and wettability alteration

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2020年第1期17卷 105-117页

作者： Hamed Foroughi Asl Ghasem Zargar Abbas Khaksar Manshad mohammad Ali Takassi Jagar A.Ali Alireza keshavarz Department of Petroleum Engineering Abadan Faculty of Petroleum EngineeringPetroleum University of Technology(PUT)AbadanIran Department of Petroleum Engineering Ahwaz Faculty of Petroleum EngineeringPetroleum University of Technology(PUT)AhwazIran Department of Petroleum Engineering Faculty of EngineeringSoran UniversitySoranKurdistan RegionIraq Department of Petroleum Engineering College of EngineeringKnowledge UniversityErbilKurdistan RegionIraq School of Engineering Edith Cowan UniversityJoondalupWA 6027Australia

Surfactant flooding is an important technique used to improve oil recovery from mature oil reservoirs due to minimizing the interfacial tension(IFT)between oil and water and/or altering the rock wettability toward water-wet using various surfactant agents including cationic,anionic,non-ionic,and amphoteric *** this study,two amino-acid based surfactants,named lauroyl arginine(L-Arg)and lauroyl cysteine(L-Cys),were synthesized and used to reduce the IFT of oil–water systems and alter the wettability of carbonate rocks,thus improving oil recovery from oil-wet carbonate *** synthesized surfactants were characterized using Fourier transform infrared spectroscopy and nuclear magnetic resonance analyses,and the critical micelle concentration(CMC)of surfactant solutions was determined using conductivity,pH,and turbidity *** results showed that the CMCs of L-Arg and L-Cys solutions were 2000 and 4500 ppm,*** was found that using L-Arg and L-Cys solutions at their CMCs,the IFT and contact angle were reduced from 34.5 to 18.0 and15.4 mN/m,and from 144°to 78°and 75°,***,the L-Arg and L-Cys solutions enabled approximately 11.9%and 8.9%additional recovery of OOIP(original oil in place).It was identified that both amino-acid surfactants can be used to improve oil recovery due to their desirable effects on the EOR mechanisms at their CMC ranges.

关键词： Chemical EOR Amino-acid surfactant IFT Wettability Coreflooding

冲击波感度与撞击感度预测的研究进展(英文)

在线全文

学校读者我要写书评

暂无评论

含能材料 2008年第1期16卷 113-120页

作者： mohammad hossein.keshavarz Arash Shokrolahi Karim Esmailpoor Abbas Zali Hamid Reza Hafizi Jamshid Azarniamehraban Department of Chemistry Malek-ashtar University of TechnologyShahin-shahr P.O.Box 83145/115Islamic Republic of Iran

Empirical,quantum mechanical and artificial neural network methods are three usual methods in recent years that were used to predict sensitivity of different classes of high *** recent developments in predicting sensi... 详细信息

关键词：工程材料撞击灵敏性爆炸力学经验主义量子力学人工神经网络

Cupping therapy can improve the quality of life of healthy people in Tehran

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2017年第4期37卷 558-562页

作者： Gholamreza Kordafshari mohammad Reza Shams Ardakani Mansoor keshavarz mohammad Mehdi Esfahani Ismaeel Nazem Maryam Moghimi Arman Zargaran Hoorieh mohammadi Kenari Department of Traditional Medicine School of Traditional Medicine Tehran University of Medical Sciences Tehran *** Iran Department of Traditional Pharmacy School of Traditional Medicine Tehran University of Medical Sciences Tehran *** Iran Hadis and Teb Sciences Research Center Tehran University of Medical Sciences Tehran *** Iran Research Office for the History of Persian Medicine Shiraz University of Medical Sciences Shiraz *** Iran Research Institute for Islamic and Complementary Medicine School of Iranian Traditional Medicine Iran University of Medi- cal SciencesTeh ran *** Iran

OBJECTIVE: To examine the influence of cupping on the quality of life of healthy people who referred to traditional Persian medicine clinics in ***: All participants were examined by Traditional Persian Medicine specialists and their temperaments were determined. The area between the shoulders was cleaned, and cupping was performed with a disposable cupping glass for a few minutes. The questionnaire used in this project was the Persian version of the SF-36 questionnaire which assesses people's understanding of their health status. Before cupping and then one monthafter cupping, all participants were called and the questionnaires were completed again. Finally, all given data was ***: From a total of 290 questionnaires completed in the first phase of the project, 112 patients were excluded. Ultimately, the data of 178 participants was analyzed. After one month, the quality of life score of 155 participants(88%) increased, remained unchanged for 21 participants(11.7%), and decreased for 2 participants(1.1%). Asked about possible complications from cupping, 160 participants reported no side effects(89.9%).CONCLUSION: Our findings suggest that cupping therapy can improve the scores of quality of life in the participants in Tehran.

关键词： Persian medicine Hijama Cupping therapy Quality of life

Preliminary report of hepatitis B virus genotype prevalence in Iran

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第32期12卷 5211-5213页

作者： Seyed-Moayed Alavian hossein Keyvani Mahdi Rezai Neda Ashayeri Homa mohammad Sadeghi Department of Internal Medicine Baqiatollah Medical University Tehran Hepatitis Center92 Vesal Shirazi StreetBoolvar KeshavarzPO Box 14155/3651TehranIran Department of Virology Iran University of Medical Sciences Hemmat ExpresswayTehranIran Student's Research Committee Iran University of Medical Sciences Hemmat ExpresswayTehranIran

AIM： To determine the prevalence of hepatitis B virus （HBV） genotypes in Iranian hepatitis B surface antigen （HBsAg） carriers, chronic hepatitis B and cirrhotic patients. METHODS： A total of 109 HBsAg-positive patients were included in this study. HBV genotypes were determined by using INNO-LiPA methodology which is based on the reverse hybridization principle. RESULTS： The distribution of patients with different stages of liver disease was as follows： 95 （86.4%） chronic hepatitis, 11 （10%） liver cirrhosis, and 3 （2.7%） inactive carrier. Of the chronic hepatitis and liver cirrhosis patients, 26.4% were HBeAg-positive while 70% were HBeAg-negative. Genotype D was the only detected type found in all patients. CONCLUSION： Classifying HBV into genotypes has to be cost-effective and clinically relevant. Our study indicates that HBV genotype D prevails in the Mediterranean area, Near and Middle East, and South Asia. Continued efforts for understanding HBV genotype through international co-operation will reveal further virological differences of the genotypes and their clinical relevance.

关键词： Hepatitis B virus Genotype Chronic Hepatitis B Cirrhosis

Epidemiological evidence of mosquito-borne viruses among persons and vectors in Iran:A study from North to South

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

Virologica Sinica 2022年第1期37卷 149-152页

作者： Abbas Ahmadi Vasmehjani Farhad Rezaei mohammad Farahmand Talat Mokhtari-Azad mohammad Reza Yaghoobi-Ershadi Mohsen keshavarz Hamid Reza Baseri Morteza Zaim Mahmood Iranpour Habibollah Turki mohammad Esmaeilpour-Bandboni Department of Virology School of Public HealthTehran University of Medical SciencesTehran14156446Iran Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical SciencesTehran14156446Iran The Persian Gulf Tropical Medicine Research Center The Persian Gulf Biomedical Sciences Research InstituteBushehr University of Medical SciencesBushehr***Iran Department of Entomology University of ManitobaR3T 2N2Canada Infectious and Tropical Diseases Research Center Hormozgan Health InstituteHormozgan University of Medical SciencesBandar Abbas***Iran School of Nursing Midwifery and ParamedicineGuilan University of Medical SciencesRasht***Iran

Dear Editor,Arthropod-borne viruses are a group of the most important emerging *** cause a range of diseases in vertebrate hosts and threaten human health(Gan and Leo,2014).The global distribution of arboviruses is as... 详细信息

关键词： conditions. diseases viruses