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Evaluation on Properties of CaO-BaO-B_2O_3-Al_2O_3-SiO_2 Glass-Ceramic Sealants for Intermediate Temperature Solid Oxide Fuel Cells

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Journal of Materials Science & Technology 2013年第1期29卷 49-54页

作者： Fatemeh heydari amir Maghsoudipour Zohreh hamnabard Sajad Farhangdoust Ceramic Division Material and Energy Research Center Ceramic Group Materials Research School

To develop suitable sealants for intermediate temperature solid oxide fuel cells （IT-SOFC）, glass-ceramics based on the CaO-BaO-B203-AI203-Si02 system were studied. Coefficient of thermal expansion （CTE）, glass transition temperature （Tg） and dilatometric softening point temperature （Td） of specimens were determined by means of dilatometer analysis and crystallization temperature was measured by differential thermal analysis （DTA）. Also, crystallization behavior during prolonged heat-treatment and microstructure properties were studied by means of X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. Electrical properties were measured at different temperatures, and the results showed a high resistance （〉104 Ω） at the SOFC operation temperature （600-800 ℃）. Moreover, mechanical properties of heat-treated specimens （1, 10, 30, 50 h） were measured, Microstructure investigation revealed a well-adhered bonding between the sealant glass-ceramic electrolyte and glass.

关键词： Glass Solid oxide fuel cells (SOFC) Thermal expansion Mechanical properties Electrical properties

Isothermal, kinetic, and thermodynamic studies for solid-phase extraction of uranium(VI) via hydrazine-impregnated carbonbased material as efficient adsorbent

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Nuclear Science and Techniques 2019年第11期30卷 41-51页

作者： A.Morsy M.h.Taha Muhammad Saeed amir Waseem Muhammad Asad Riaz M.M.Elmaadawy Nuclear Materials Authority El MaddiP.O.Box 530CairoEgypt Department of Chemistry Quaid-i-Azam UniversityIslamabad 45320Pakistan

The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated *** experimental parameters such as time, adsorbent weight, temperature(°C), and uranium concentration were thoroughly investigated. The synthesized adsorbent was characterized via X-ray diffraction, Fourier transformation infrared spectroscopy(FT-IR), scanning electron microscopy, and thermogravimetric analysis. The results showed86% uranium extraction under optimized conditions(20% P2O5 at 25 °C, 120 min). The obtained findings fit well with thermodynamic and isothermal(Langmuir and Freundlich isotherms) models and pseudo second-order kinetics. In thermodynamic studies, the negative sign of(DG°) specified the spontaneity of process, the negative sign of(Dh°) revealed endothermicity, and the positive sign of(DS°) showed high randomness after adsorption.

关键词： Uranium Adsorption Phosphoric acid hydrazine Carbon

Prediction of sand production onset in petroleum reservoirs using a reliable classification approach

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Petroleum 2017年第2期3卷 280-285页

作者： Farhad Gharagheizi amir h.Mohammadi Milad Arabloo Amin Shokrollahi Department of Chemical Engineering Texas Tech UniversityLubbockTXUnited States Thermodynamics Research Unit School of EngineeringUniversity of KwaZulu-NatalHoward College CampusKing George V AvenueDurban4041South Africa Institut de Recherche en Genie Chimique et Petrolier(IRGCP) Paris CedexFrance Departement de Genie des Mines de la Metallurgie et des MateriauxFaculte des Sciences et de GenieUniversite LavalQuebec(QC)G1V 0A6Canada Young Researchers and Elites Club North Tehran BranchIslamic Azad UniversityTehranIran

Controlling sand production in the petroleum industry has been a long-standing problem for more than 70 *** provide technical support for sand control strategy,it is necessary to predict the conditions at which sanding *** this end,for the first time,least square support machine(LSSVM)classification approach,as a novel technique,is applied to identify the conditions under which sand production *** model presented in this communication takes into account different parameters that may play a role in *** performance of proposed LSSVM model is examined using field data reported in open *** is shown that the developed model can accurately predict the sand production in a real *** results of this study indicates that implementation of LSSVM modeling can effectively help completion designers to make an on time sand control plan with least deterioration of production.

关键词： Sand production Least square SVM ROC graph Classification description Modeling Sanding onset

Remimazolam for sedation in gastrointestinal endoscopy:A comprehensive review

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World Journal of Gastrointestinal Endoscopy 2024年第7期16卷 385-395页

作者： Dushyant Singh Dahiya Ganesh Kumar Syeda Parsa Manesh Kumar Gangwani hassam Ali amir humza Sohail Saqr Alsakarneh Umar hayat Sheza Malik Yash R Shah Bhanu Siva Mohan Pinnam Sahib Singh Islam Mohamed Adishwar Rao Saurabh Chandan Mohammad Al-haddad Division of Gastroenterology Hepatology&MotilityThe University of Kansas School of MedicineKansas CityMO 66160United States Department of Internal Medicine Chandka Medical CollegeSindh 77280Pakistan Department of Gastroenterology and hepatology University of Arkansas For Medical SciencesLittle RockAR 72205United States Division of Gastroenterology Hepatology and NutritionEast Carolina University/Brody School of MedicineGreenvilleNC 27858United States Department of Surgery University of New Mexico School of MedicineAlbuquerqueNM 87106United States Department of Internal Medicine University of Missouri-Kansas CityKansas CityMO 64108United States Department of Internal Medicine Geisinger Wyoming Valley Medical CenterWilkes BarrePA 18711United States Department of Internal Medicine Rochester General HospitalRochesterNY 14621United States Department of Internal Medicine Trinity Health Oakland/Wayne State UniversityPontiacMI 48341United States Department of Internal Medicine John H.Stroger Hospital of Cook CountyChicagoIL 60612United States Department of Internal Medicine Sinai hospitalBaltimoreMD 21215United States Department of hepatology University of MissouriColumbiaMO 65211United States Department of Internal Medicine Guthrie Robert Packer HospitalSayrePA 18840United States Division of Gastroenterology and hepatology Creighton University School of MedicineOmahaNE 68131United States Division of Gastroenterology and hepatology Indiana University School of MedicineIndianapolisIN 46202United States

Worldwide,a majority of routine endoscopic procedures are performed under some form of sedation to maximize patient ***,benzodiazepines and opioids continue to be widely ***,in recent years,Remimazolam is gaining immense popularity for procedural sedation in gastrointestinal(GI)*** is an ultra-short-acting benzodiazepine sedative which was approved by the Food and Drug Administration in July 2020 for use in procedural *** has shown a favorable pharmacokinetic and pharmacodynamic profile in terms of its non-specific metabolism by tissue esterase,volume of distribution,total body clearance,and negligible drug-drug *** also has satisfactory efficacy and has achieved high rates of successful sedation in GI ***,studies have demonstrated that the efficacy of Remimazolam is non-inferior to Propofol,which is currently a gold standard for procedural sedation in most parts of the ***,the use of Propofol is associated with hemodynamic instability and respiratory *** contrast,Remimazolam has lower incidence of these adverse effects intra-procedurally and hence,may provide a safer alternative to Propofol in procedural *** this comprehensive narrative review,highlight the pharmacologic characteristics,efficacy,and safety of Remimazolam for procedural *** also discuss the potential of Remimazolam as a suitable alternative and how it can shape the future of procedural sedation in gastroenterology.

关键词： Remimazolam Endoscopy Sedation Outcomes Efficacy Safety Pharmacokinetics

Synthesis of new 4,6-diaryl-2-(arylthio)nicotinonitriles in Triton X-100 aqueous micellar media

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Chinese Chemical Letters 2015年第2期26卷 263-266页

作者： Mohammad Reza Poor heravi amir Soufi Department of Chemistry Payame Noor University

In this communication,we report four component condensations of acetophenone,arylaldehydes,arylthiol,and malononitrile in the presence of Triton X-100（5 mol%） aqueous *** reaction led to the formation of 4,6-diaryl-2-（arylthio）nicotinonitrile new derivatives in good *** FT-IR,^19F NMR,^1h NMR,^13C NMR spectra and elemental analysis confirm the structure of compounds.

关键词： Nicotinonitriles Triton X-100 Aqueous micellar media Non-ionic surfactant

Endoscopic retrograde cholangiopancreatography outcome from a single referral center in Iran

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hepatobiliary & Pancreatic Diseases International 2010年第4期9卷 428-432页

作者： amir h Mohammad Alizadeh Esmaeil S Afzali Mirhadi Mousavi Yaghoub Moaddab Mohammad R Zali Shahid Beheshti University of Medical Sciences Taleghani Hospital

BACKGROUND: Endoscopic retrograde cholangiopancreato- graphy (ERCP) is the first choice for diagnostic evaluation of the pancreatic and biliary tree and can be accompanied by a high diagnostic sensitivity and a poor therapeutic outcome. In the current study, we described our experiences in the indications, findings, and technical success of ERCP in a sample of the Iranian population admitted to a referral center in Iran. METhODS: In a retrospective review database-based study, 780 patients (393 males and 387 females; mean age 57.5 years) who had undergone diagnostic and therapeutic ERCP with the primary diagnosis of hepatobiliary disorder between 2006 and 2008 at Taleghani hospital in Tehran were reviewed. The key data were demographic characteristics, clinical information, laboratory parameters, as well as post-ERCP complications. RESULTS: A history of cholecystectomy was found in about one-third (36.3%) of participants and 80 (10.3%) out of 780 patients had a previous history of biliary stone. A minority (1.4%) of the patients suffered from hepatobiliary carcinomas, and 11 patients had cirrhosis. The most common clinical manifestations in the patients undergoing diagnostic ERCP were icterus (47.3%), weight loss (31.2%), and dark urine (26.9%). Selective biliary cannulation was technically successful in 87.0% of the patients; however, cannulation failed in 13.0%. The most frequent final diagnosis of ERCP was common bile duct stone that was detected in 40.1% of the patients. The ERCP results in 11.0% of the patients were normal. Regarding appropriate treatment, successful stenting was performed in 43 patients (15.2%). Among post-ERCP complications, pancreatitis was the most adverse event withan incidence rate of 3.3%. Other complications including local bleeding, cholangitis and gastrointestinal perforation, rarely occurred. Post-ERCP pancreatitis was reported in 1.8% of men and 3.6% of women (P=0.120). Pancreatitis was more common in women below 70 years than in th

关键词： endoscopy outcome diagnosis complication pancreatitis

ThE EFFECT OF SUBSTITUENT ON ThE ThERMAL PROPERTIES OF POLYESTERS CONSISTING OF AROMATIC TYPE SChIFF BASE MESOGENIC UNITS AND POLYMEThYLENE SPACERS

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Chinese Journal of Polymer Science 1995年第1期13卷 51-58页

作者： Amar h.Al-Dujaili Iman F.Mustafa amir T.Atto Department of Chemistry College of Education Ibn Al-Hytham University of Baghdad Baghdad P. O. Box 7358 IraqDepartment of Chemistry College of Education Ibn Al-Hytham University of Baghdad Baghdad P. O. Box 7358 IraqDepartment of Chemistry College of Sciences University of Sadaam Baghdad Iraq

Polyesters consisting of substituted aromatic type Schiff base mesogenic unit andpolymethylene spacers were synthesized and their thermal transitions and liquid crystallineproperties were studied. The liquid crystalline behaviour has been characterized by differentialscanning calorimetry (DSC) and optical polarizing microscopy. Structural broadening bysubstitution of methoxy group in 2, 2' positions of the mesogenic core produce polymers withlower transition temperatures. Polymers synthesized from ortho and meta substituted phenylenediamine did not form a liquid crystal phase.

关键词： Liquid crystal polymer Polyesters Aromatic type schiff base Mesogenic units Spacers

Fabrication of Microporous Membranes from Melt Extruded Polypropylene Precursor Films via Stretching: Effect of Annealing

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Chinese Journal of Polymer Science 2015年第7期33卷 1028-1037页

作者： Shan Wang amir Saffar Abdellah Ajji hong Wu 郭少云 The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Research Center for high performance Polymer and Composite Systems (CREPEC) Chemical Engineering DepartmentPolytechnique MontrealP.O. Box 6079Montreal Quebec H3C 3A7 Canada

In this work, the effects of annealing conditions on the microstructure of polypropylene（PP） precursor films and further on the porous structure and permeability of stretched membranes were investigated. Combinations of WAXD, FTIR, DSC and DMA results clearly showed the crystalline orientation and crystallinity of the precursor film increased with annealing temperature, while the molecular chain entanglements in the amorphous phase decreased. Changes in the deformation behavior suggested more lamellar separation occurred for the films annealed at higher temperatures. Surface morphologies of the membranes examined by SEM revealed more pore number and uniform porous structure as the annealing temperature increased. In accordance with the SEM results, the permeability of the membranes increased with annealing temperature. On the other hand, it was found that 10 min was almost enough for the annealing process to obtain the microporous membranes with an optimal permeability.

关键词： Annealing Microporous membrane Polypropylene Crystalline orientation Deformation behavior

Synthesis of Gd_2O_3 nanoparticles:using bulk Gd_2O_3 powders as precursor

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Rare Metals 2015年第8期34卷 540-545页

作者： Taher Yousefi Meisam Torab-Mostaedi Mostafa Ghasemi amir Ghadirifar Nuclear Fuel Cycle Research School Nuclear Science andTechnology Research Institute

Gd2O3nanoparticles were synthesized from the commercial bulk Gd2O3 powders via a simple electrochemical method. The synthesized powders were characterized by means of X-ray powder diffraction(XRD),scanning electron microscopy(SEM), transmission electron microscopy(TEM) and Fourier transform infrared(FTIR) spectroscopy. The effects of solution p h on the morphological features of the sample were studied. The strategy developed in this study offers significant advantages for the synthesis of Gd2O3 nanoparticles from the bulk Gd2O3 powders compared with the conventional routes. From SEM observations, the size of the Gd2O3 nanoparticles is estimated to be significantly smaller than70 nm.

关键词： Gd2O3 Nanoparticles Electro-deposition Nanostructu