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Influence of initial microstructure and grain size on transformation of bainite to austenite in large size forgings

Journal of Iron and Steel Research International 2018年第5期25卷 554-562页

作者： Emna Ben Fredj hadi ghasemi Nanesa Mohammad Jahazi Jean-Benoit Morin Department of Mechanical Engineering Ecole deTechnologie Superieure Montreal QC H3C 1K3 Canada Finkl Steel-Sorel St-Joseph-de-Sorel QC J3R 3M8 Canada

The kinetics of austenite formation in the surface and center regions of a 40 t forged ingot of a high-strength medium- carbon low-alloy steel was studied using high-resolution dilatometry. The starting microstructures from the surface or center regions had different proportions of bainite and residual austenite as well as different prior austenite grain sizes. Two heating rates representing the actual heating rates in the surface （5℃ s -1） and center regions （0.5℃ s -1） of large size forged blocks were utilized. Dilatometric curves revealed only one transformation step of austenite formation at both heating rates independent of grain size or proportion of phases. Optical microscopy, field emission gun scanning electron microscopy and X-ray diffraction were used to study microstructure evolution and confirm the results obtained by dilatometry. The kinetic parameters for austenite formation were determined from the dilatometry data by Johnson-Mehl- Avrami-Kolmogorov （JMAK） equation. The JMAK coefficients were determined for each condition of the investigated steels. The calculations indicated that the nucleation and growth of austenite in the surface region were accelerated more than 10,000 times due to a significantly smaller average prior austenite grain size, stability of initial retained austenite, and accumulation of coarse carbides at the surface. The results were discussed in the framework of classical nucleation and growth theories using the kinetic parameters for austenite formation.

关键词： Large size ingot Medium-carbon low-alloy steel Initial microstructure Grain size Austenite formation

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Molecular Modelling of the Therapeutic agents for COVID-19 Treatment

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Infectious Diseases Research 2021年第1期2卷 1-9页

作者： Akram Ranjbar Ranjbar Sara Torabi Torabi Davood Nematollahi Nematollahi Mahdi Jamshidi Jamshidi hadi ghasemi ghasemi Nutrition HealthResearchCenter Hamadan UniversityofMedicalSciencesHamadanIran Department ofToxicology&Pharmacology Faculty ofPharmacyHamadan UniversityofMedicalSciencesHamadanIran Department ofAnalytical Chemistry Faculty ofChemistryBu-Ali SinaUniversityHamadanIran Department ofClinicalBiochemistry Hamadan University ofMedicalSciencesHamadanIran

Objective:We aimed to develop a bioinformatics approach for drug discovery variety of effective drugs for Coronavirus disease treatment(COVID-19).Methods:First,the structure of relevant drugs have been optimized and prepared as input data for docking ***,The X-ray structure of SARS CoV-2(PDB ID:6VWW)and 2019-nCoV(PDB ID:6M0J)receptors is prepared by eliminating water molecules and unique ***,significant interactions have been reported with Discovery Studio 4.5 Client ***:The MolDock Score value indicated the positive effect of drugs on the inactivation of *** and Ritonavir drugs have the most inhibitory effect(MolDock Scores:-160.49 and-205.91 kj/mol),and a wide spectrum of interactions such as Van der Waals,conventional hydrogen bond,carbon-hydrogen bond,Pi-doner hydrogen bond,Pi-Pi stacked,Pi Pi T-shaped,Alkyl,and Pi Alkyl is contributed in final binding affinity.

关键词： Novel coronavirus COVID-19 Virtualscreening Molecular docking MolergroVirtualDocker MolDock Score Binding affinity

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Experimental Analysis and Evaluation of Thermostat Effects on Engine Cooling System

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Journal of Thermal Science 2021年第2期30卷 540-550页

作者： ghasemi ZAVARAGH hadi KALELI Alirlza SOLMUS Ismail AFSHARI Faraz Department of Mechanical Engineering Faculty of Al-ghadirZanjan BranchTechnical and Vocational University(TVU)Tehran 14357Iran Department of Electrical and Electronic Engineering Engineering FacultySamsun UniversitySamsun 55080Turkey Department of Mechanical Engineering Ataturk UniversityErzurum 25240Turkey Department of Mechanical Engineering Erzurum Technical UniversityErzurum 25240Turkey

Thermostat as a part of engine cooling system has a significant role in the shortening warm-up time and regulating the engine in proper temperature to approach optimal ***,there is not adequate research on this part of the cooling system and its *** this gap and also being used in large scale,this study is intended to evaluate performance and reflex of the wax type thermostat in different engine working *** this regard,performance of engine cooling system was investigated in various engine speeds and loads to reveal positive and negative influences of thermostat on engine cooling efficiency and engine *** to observed results,warm-up period and fuel consumption decrease by using a *** the other hand,however,the temperature oscillation of coolant fluid passing through engine increases sharply,which causes a disruption in the regulating engine temperature and also a possibility of the fluid boiling rises in some regions of the engine that increases the risk of damage in the engine *** temperature,fuel consumption,warm-up duration and emissions were provided and compared in two operation modes,with and without thermostat.

关键词： engine cooling system wax type thermostat warm-up radiator emissions fuel consumption

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Faunal data and envenomation emergency first aid of cone snails (Conus spp.) in Qeshm Island, the Persian Gulf

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Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1167-1171页

作者： Mehdi Khoobdel hadi Dehghani Ali Mehrabi Tavana Mohammad ghasemi Seyyed Mohammad Dakhteh Majid Askari Hesni Mohsen Rezaie-Atagholipour Health Research Center Baqiyatallah University of Medical SciencesTehranIran Department of Marine Biology Faculty of ScienceUniversity of HormozganBandar AbbasIran Health Management Research Center Baqiyatallah University of Medical SciencesTehranIran Environmental Management Office Qeshm Free Area OrganizationQeshm IslandIran Department of Biology Faculty of ScienceShahid Bahonar University of KermanKermanIran

Objective: To investigate the fauna of a highly venomous marine species group, the cone snails(Family Conidae), in the shores of Qeshm Island, of evaluating the possibility of envenomation in the area and summarize recommendations for emergency first ***: Shores surrounding Qeshm Island were surveyed to collect cone snails during cold(February and March) and warm(May and June) seasons of 2017. Collected snails were identified to the species level. Abundance and species richness were estimated in shores of different structures, including muddy and sandy-rocky shores. Also, the most updated medical literature was reviewed to summarize related emergency first ***: Three cone snail species were recorded from southern sandy-rocky shores of the Island, in decreasing order of abundance, included crowned cone(Conus coronatus)(65%), feathered cone(Conus pennaceus)(28%), and frigid cone(Conus frigidus)(7%).Abundance of these species were significantly higher in cold season compared to the warm season(P < 0.05). No cone snails were recorded along the northern muddy shores of the ***: Envenomation can cause various symptoms ranging from minor local pain to systemic paralysis and death due to respiratory failure. We recommend an awareness programme for the seashore visiting public.

关键词： Envenomation symptoms Subtropical coastal waters Sandy shores Venom

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具有高导热性的聚乙烯薄膜

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家电科技 2019年第3期 8-8页

作者： Yanfei Xu Daniel Kraemer Bai Song Zhang Jiang Jiawei Zhou James Loomis Jianjian Wang Mingda Li hadi ghasemi Xiaopeng Huang Xiaobo Li Gang Chen 李巧红美国麻省理工学院

聚合物材料,也就是通常说的塑料,由于其独特的性能,使其成为热绝缘体的绝佳材料。近年来的研究表明,聚合物具有较高的导热性,但其传输机制仍然未知。在本文中作者发明了一种具有62Wm^-1K^-1高导热性的聚乙烯薄膜,比普通聚合物的导热性(-... 详细信息

聚合物材料,也就是通常说的塑料,由于其独特的性能,使其成为热绝缘体的绝佳材料。近年来的研究表明,聚合物具有较高的导热性,但其传输机制仍然未知。在本文中作者发明了一种具有62Wm^-1K^-1高导热性的聚乙烯薄膜,比普通聚合物的导热性(-0.1Wm^-1K^-1)大两个数量级,甚至超过许多常见的金属和陶瓷。结构研究和热模拟实验表明,这种薄膜由具有晶态和非晶态区域的纳米纤维组成,非晶态区域具有非常高(>16Wm^-1K^-1)的导热系数。作者的这项研究成果为具有重量轻、耐用、柔韧、耐腐蚀、易于加工等优势的高导热聚合物的设计和合成奠定了基础。

关键词：聚乙烯薄膜导热性聚合物材料热模拟实验非晶态传输机制纤维组成导热系数

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Relevance of Hepatocyte Growth Factor and Fibroblast Growth Factor on Mouse Preimplantation Embryo Development

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Journal of Reproduction and Contraception 2009年第4期20卷 195-204页

作者： Mohammad hadi Bahadori Mahnaz Azarnia Fatemeh ghasemian Fahimeh ghasemi Shervin Ghadarjani Narges Khojasteh Masumeh Ahmadi Jalali Moghaddam Department of Anatomy Faculty of medicineGuilan University of medical sciences Department of Biology Faculty of scienceKharazmi (Tarbiat moallem) university Medical intern Faculty of medicineGuilan University of medical sciences Cellular and molecular research center Faculty of medicineGuilan University of medical sciences

Objective To explore the effect of hepatocyte growth factor （HGF） and fibroblast growth factor （FGF） on preimplantation embryo development of mouse.Methods Mated mice were killed by cervical dislocation to collect two pronucleous （2 PN） zygotes from oviduct of pregnant 1 d NMRI mice and were cultured to the hatching blastocyst stage and the number of embryo in different stages was recorded under an invert microscope. The cleavage rates of formed 2 PN zygotes were compared with blastocyst and hatching blastocyst stage in drops of T6 medium with or without HGF or FGF （0 ng/ml, 10 ng/ml, 20 ng/ml, 50 ng/ml, 1 000 ng/ml）. Results HGF and FGF enriched embryo culture media promotea the aevetopment from 2 PN stage embryos to blastocyst. Adding 20 ng/ml of FGF or HGF to the culture medium significantly increased the percentage of 2PN embryos that developed into blastocysts （P〈0.05）, but culture of embryos in drops of T6 medium with HGF （20 ng/ml） had no improvement in in-vitro hatching.Conclusion Exogenous HGF and FGF at low concentrations promote in-vitro mouse blastocyst formation.

关键词： fibroblast growth factor (FGF) hepatocyte growth factor (HGF) preimplantation development cleavage blastocyst

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