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Metabolism of energy substrates of in vitro and in vivo derived embryos from ewes synchronized and super ovulated with norgestomet and porcine follicle stimulating hormone

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Journal of Animal Science and Biotechnology 2013年第1期4卷 58-64页

作者： ahmad azizi-Moghadam Department of Clinical Sciences College of Veterinary Medicine University of Zabol

The synchronization and ovulatory responses of Sangsari cross bred ewes and metabolism of energy substrates in 8-cell stage embryos to hatched blastocysts stage produced in vitro or in vivo were investigated. Ewes were assigned randomly to receive 37.5 IU of porcine follicle stimulating hormone （FSH-P） daily for the 3 days preceding implant removal （Day 0）. Synchronization of estrus was carried out using a 1.5 mg norgestomet （Crestar） ear implant for ] 2 days. Ewes in estrus were mated two to three times with rams of proven fertility. At the time of first mating each ewe was administered 1000 IU of human chorionic gonadotrophin （hCG） to induce ovulation. Surgical embryo recovery was performed on Days 4 and 6 after onset of estrus （Day 0） and recovered embryos were subjected to comparative metabolism studies with in vitro derived embryos at the same stage of development. The number of corpora lutea （CL）, unovulated follicles and overall ovarian activity were recorded for each ewe during the breeding and non-breeding seasons. While the pattern of oxidation was similar among in vitro and in vivo derived embryos, a low pyruvate to lactate ratio was the preferred substrate of embryos derived in vitro. A high level of production of C02 and lactate resulted from a stress response to the suboptimal culture environment. The first marked increase in the metabolism of glucose by ovine embryos was detected in compact morula stage, but there was no significant increase in the oxidation of glucose after the morula stage. Two different concentrations of glucose were compared, but this did not affect metabolism. However, the rate of incorporation and metabolism of glucose tended to be higher at the 0.56 mmol/L glucose dosage.

关键词： Crestar Glucose Lactate Metabolism Norgestomet Pyruvate

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Progressive failure analysis of notched composite plate by utilizing macro mechanics approach

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Frontiers of Structural and Civil Engineering 2021年第3期15卷 623-642页

作者： Seyed M.N.GHOREISHI Mahdi FAKOOR ahmad azizi Faculty of New Sciences and Technologies University of TehranTehran***Iran Department of Mechanical Engineering Science and Research BranchIslamic Azad UniversityTehran***Iran

In this study,gradual and sudden reduction methods were combined to simulate a progressive failure in notched composite plates using a macro mechanics *** the presented method,a progressive failure is simulated based on a linear softening law prior to a catastrophic failure,and thereafter,sudden reduction methods are employed for modeling a progressive *** combination method significantly reduces the computational cost and is also capable of simultaneously predicting the first and last ply failures(LPFs)in composite *** proposed method is intended to predict the first ply failure(FPF),LPF,and dominant failure modes of carbon/epoxy and glass/epoxy notched composite *** addition,the effects of mechanical properties and different stacking sequences on the propagation of damage in notched composite plates were *** results of the presented method were compared with experimental data previously reported in the *** comparing the numerical and experimental data,it is revealed that the proposed method can accurately simulate the failure propagation in notched composite plates at a low computational cost.

关键词： progressive failure notched composite plate Hashin failure criterion macro mechanics approach finite element method

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Investigating the first-order flotation kinetics models for Sarcheshmeh copper sulfide ore

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International Journal of Mining Science and Technology 2015年第5期25卷 849-854页

作者： Asghar azizi ahmad Hassanzadeh Behnam Fadaei Department of Mining Petroleum and GeophysicsUniversity of Shahrood Mineral Processing Department Faculty of MinesIstanbul Technical University

This study was performed in two phases of *** the first stage,four conventional first-order flotation kinetics models were fitted to the measured recoveries data and the best model were *** the second stage,influence of pH,solid concentration,water chemistry and the amount of collector dosage were investigated on kinetics parameters including flotation rate constant and ultimate *** results indicated that that perfectly mixed reactor model and Kelsall model gave the best and the weakest fit to the experimental data,*** was observed that flotation rate constant and ultimate recovery were strongly affected by chemical factors investigated especially water *** flotation rate constant decreased with increasing the solids content,while ultimate recovery increased to certain value and thereafter *** was also found that the most values of flotation rate constant and ultimate recovery obtained in dosage of collector are 30 and 40 g/t,respectively.

关键词： Copper ore Flotation Kinetics model Rate constant Ultimate recovery

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SIMULATION OF VISCOELASTIC FLUID FLOWS IN EXPANSION GEOMETRY USING FINITE VOLUME APPROACH

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Chinese Journal of Polymer Science 2013年第12期31卷 1599-1612页

作者： Morteza azizi ahmad Ramazani S.A Habib Etemadi M Ehsan Shirzaei S Department of Chemical and Petroleum Engineering Sharif University of Technology

The simulation results on viscoelastic fluid flows in sudden expansion geometry with different expansion ratios are presented. Oldroyd-B, linear Phan-Thien-Tanner （L-PTT） and Finitely Extensible Nonlinear Elastic （FENE-P） based constitutive equations were applied in two-dimensional Cartesian coordinates. The governing equations in transient and fully developed regions were solved using open source software called OpenFOAM. The flow patterns, including velocity profiles, shear stresses and first normal stress differences in some horizontal and vertical sections are illustrated. In addition, effects of the fluid type, flow dynamics and expansion ratio on the flow and vortex patterns in transient and fully developed regions are presented and discussed. The presented results show that existences of vortices cause the inverse velocity and negative stresses in expansion regions of the channel which increase with increment of expansion ratio and Weissenberg number （We）. Furthermore, some dead spaces can be observed at channel expansion regions close to the wall which are also increased. The results also show that at low We numbers all fluids show close behavior while at high We numbers the FENE-P fluid behavior shows high divergence from that of the two other fluids.

关键词： Expansion flow Simulation Finite Volume OpenFOAM Viscoelastic Fluids.

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Preparation and Properties of Poly(vinyl alcohol)/Chitosan Blend Bio-nanocomposites Reinforced by Cellulose Nanocrystals

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Chinese Journal of Polymer Science 2014年第12期32卷 1620-1627页

作者： Susan azizi Mansor Bin ahmad Nor Azowa Ibrahim Mohd Zobir Hussein Farideh Namvar Department of Chemistry Faculty of Science University Putra Malaysia Materials Synthesis and Characterization Laboratory Institute of Advanced Technology University Putra Malaysia Institute of Tropical Forestry and Forest Products Universiti Putra Malaysia Mashhad Branch Islamic Azad University

The aim of this paper is to report the effect of the addition of cellulose nanocrystals（CNCs） on the mechanical, thermal and barrier properties of poly（vinyl alcohol）/chitosan（PVA/Cs） bio-nanocomposites films prepared through the solvent casting process. The characterizations of PVA/Cs/CNCs films were carried out in terms of X-ray diffraction（XRD）, transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, thermogravimetric analysis（TGA and DTG）, oxygen transmission rate（OTR）, and tensile tests. TEM and SEM results showed that at low loading levels, CNCs were dispersed homogenously in the PVA/Cs matrix. The tensile strength and modulus in films increased from 55.1 MPa to 98.4 MPa and from 395 MPa to 690 MPa respectively, when CNCs content went from 0 wt% to 1.0 wt%. The thermal stability and oxygen barrier properties of PVA/Cs matrix were best enhanced at 1.0 wt% of CNCs loading. The enhanced properties attained by incorporating CNCs can be beneficial in various applications.

关键词： Bio-nanocomposite Poly(vinyl alcohol)/chitosan Cellulose nanocrystals Mechanical properties Thermal properties.

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Relationship between Helium Degassing of Cattle-Manure-Compost Adsorbents and Copper Ions Removal

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International Journal of Organic Chemistry 2012年第3期2卷 262-266页

作者： Muhammad Abbas ahmad Zaini Mohd azizi Che Yunus Yoshimasa Aman Motoi Machida Centre of Lipids Engineering & Applied Research Universiti Teknologi Malaysia Skudai Johor Malaysia Safety and Health Organization Chiba University Chiba Japan

This work was aimed to investigate the effect of helium degassing of cattle-manure-compost (CMC) based activated carbons on the adsorptive removal of copper ions from aqueous solution. Degassing temperatures were 500℃, 800℃ and 1000℃. Activated carbons were characterized according to surface chemistry and pore structures. Adsorption of copper ions was carried out using the conventional bottle-point technique to which the equilibrium data were correlated to Langmuir and Freundlich models. Results indicated that the uptake of copper ions could be well characterized by Langmuir model. It was found that the adsorption of copper ions decreased with significant decrease in surface area as a result of helium degassing at higher temperature. The increase of electron density on graphene layers offered higher affinity towards copper ions at lower equilibrium concentration. It was inferred that copper ions favorably adsorbed on mesopores at lower equilibrium concentration and switched to micropores at higher equilibrium concentration.

关键词： Activated Carbon Adsorption Copper Ions Cattle-Manure-Compost Helium Degassing

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Improvement of thermally grown oxide layer in thermal barrier coating systems with nano alumina as third layer

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Transactions of Nonferrous Metals Society of China 2013年第5期23卷 1322-1333页

作者： Mohammadreza DAROONPARVAR Muhamad azizi Mat YAJID Noordin Mohd YUSOF Saeed FAR AHANY Mohammad Sakhawat HUSSAIN Hamid Reza BAKHSHESHIRAD Z.VALEFI ahmad ABDOLAHI Department of Materials Manufacturing and Industrial EngineeringFaculty of Mechanical EngineeringUniversiti Teknologi Malaysia School of Metallurgy and Materials College of EngineeringUniversity of Tehran

A thermally grown oxide （TGO） layer is formed at the interface of bond coat/top coat. The TGO growth during thermal exposure in air plays an important role in the spallation of the ceramic layer from the bond coat. High temperature oxidation resistance of four types of atmospheric plasma sprayed TBCs was investigated. These coatings were oxidized at 1000 °C for 24, 48 and 120 h in a normal electric furnace under air atmosphere. Microstructural characterization showed that the growth of the TGO layer in nano NiCrAlY/YSZ/nano Al2O3 coating is much lower than in other coatings. Moreover, EDS and XRD analyses revealed the formation of Ni（Cr,Al）2O4 mixed oxides （as spinel） and NiO onto the Al2O3 （TGO） layer. The formation of detrimental mixed oxides （spinels） on the Al2O3 （TGO） layer of nano NiCrAlY/YSZ/nano Al2O3 coating is much lower compared to that of other coatings after 120 h of high temperature oxidation at 1000 °C.

关键词： high temperature oxidation nano thermal barrier coatings TGO layer spinels

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Phytochemical and toxicity evaluation of Phaleria macrocarpa(Scheff.)Boerl by MCF-7 cell line and brine shrimp lethality bioassay

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Journal of Coastal Life Medicine 2016年第1期 45-49页

作者： Abul Kalam Azad Wan Mohd azizi Wan Sulaiman Nushrat Khan Sunzida Department of Basic Medical Sciences Faculty of PharmacyInternational Islamic University MalaysiaJalan Sultan Ahmad Shah25200 Indera MahkotaKuantanPahangMalaysia Gonoshasthaya Samaj Vittik Medical College DhakaBangladesh

Objective:To evaluate the cytotoxicity of Phaleria macrocarpa fruits ***:The cytotoxicity test was carried out by in vitro MCF-7 cell line and in vivo brine shrimp lethality ***:The preliminary phytochemical test showed the presence of alkaloids,carbohydrate,glycosides,saponin,terpene,steroids,phenols and *** MTT-assay results showed that the highest percentage of cell viability was 106.23%at concentration of 1.25μL and the lowest percentage was 13.04%at concentration of 10μ***:The MTT-assay and brine shrimp lethality bioassay results showed that the extract was non-toxic and it would be consumable as a herbal remedy.

关键词： MCF-7 Phaleria macrocarpa Brine shrimp lethality bioassay Toxicity

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