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Estimating zona pellucida hardness under microinjection to assess oocyte/embryo quality: Analytical and experimental studies

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Advances in Bioscience and Biotechnology 2013年第5期4卷 679-688页

作者： Morteza Khalilian Mojtaba Rezazadeh Valojerdi Mehdi Navidbakhsh Mahmoud Chizari poopak eftekhari-yazdi Department of Anatomy Faculty of Medical sciences Tarbiat Modares University Tehran Iran Department of Embryology Reproductive Biomedicine Research Center Royan Institute for Reproductive Biomedicine Academic Center for Education Culture and Research (ACECR) Tehran Iran Mechanical Engineering Department Iran University of Science and Technology Tehran Iran School of Design and Engineering Brunel University West London London UK

The precise determination of zona pellucida (ZP) hardness is largely unknown due to the lack of appropriate measuring and modelling methods. In this study, we have used experimental and theoretical models to describe the mechanical behavior of a single oocyte cell to improve the assisted reproductive technology (ART) outcomes by assessing oocyte/embryo quality. This paper presents the development of: i) a microinjection model to estimate the force of ZP penetration, ii) a micropipette aspiration model to determine the corresponding hardness, and iii) an experimental procedure to generate the required data for these two models. Our results show that the estimated penetration force provides a performance target for the penetration process during intracytoplasmic sperm injection (ICSI), while the estimated corresponding hardness serves as an indicator of the extent of deformation sustained by the oocyte prior to penetration. Evaluation of these results shows that a routine assessment of ZP hardness under microinjection would allow for the identification of certain oocyte pools for which further manipulation is recommended in order to improve injection, hatching and finally ART outcomes.

关键词： Human Oocyte Human Embryo Intracytoplasmic Sperm Injection Zona Pellucida Hardness

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On the occurrence of Neoplanorbulinella Matsumaru, 1976(Foraminifera) from the late Oligocene of Central Iran(Qom Formation):Palaeobiogeographic implications

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Journal of Palaeogeography 2024年第1期13卷 80-91页

作者： Mehdi Sarfi Mohsen yazdi-Moghadam School of Earth Sciences Damghan UniversityDamghan ***Iran National Iranian Oil Company Exploration Directorate Sheikh Bahaie SquareTehran ***Iran

The shallow marine carbonates of the upper Oligocene Qom Formation yielded several occurrences of the foraminiferan genus Neoplanorbulinella Matsumaru. Neoplanorbulinella saipanensis Matsumaru has so far been recorded from the late Eocene-early Miocene of Japan and late Oligocene of NE Italy whereas N. malatyaensis Gedik is only reported from the Oligocene from its type locality in the Malatya Basin, eastern Turkey. The new records reported here from the Qom Formation indicate that both species occur in the Dobaradar section, ca. 10 km south of the city of Qom in North-Central Iran. The palaeogeographic distribution of these two species therefore has to be extended as far as the palaeolongitude of current Central *** accompanying larger benthic foraminifers, including Miogypsinoides complanatus(Schlumberger),M. formosensis Yabe and Hanzawa, Spiroclypeus margaritatus(Schlumberger), Operculina complanata(Defrance), and Risananeiza pustulosa Boukhary et al., indicate the upper Chattian SBZ 23 Zone. The coexistence of the N. saipanensis and N. malatyaensis points to suitable palaeobiogeographic conditions of Central Iran to host Western and Eastern Tethyan taxa.

关键词： Larger foraminifers Planorbulinids Biostratigraphy Qom Formation Central Iran

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Platform Evolution in an Oligo-Miocene Back-arc Basin:An Example from the Central Iran Basin

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 185-206页

作者： Masoud SHARIFI-yazdi Amirhossein ENAYATI Jamal SALEHI AGHDAM Mohammad BAHREHVAR Seyed Mustafa REZAEI Department of Geology Faculty of Earth SciencesGeography and AstronomyUniversity of Vienna1090 Vienna.Austria Geology and Geophysics Department Tehran Energy Consultants(TEC Co.)TehranIran School of Geology College of ScienceUniversity of TehranTehranIran Department of Geology Tarbiat Modares UniversityTehranIran

The Qom Formation is the most important hydrocarbon reservoir target in Central *** Qom platform developed in a back-arc basin during the Oligo-Miocene due to the closing of the Tethyan *** formation consists of a variety of carbonate and non-carbonate facies deposited on a platform ranging from supratidal to basin.A combination of tectonic and eustatic events led to some lateral and vertical facies variations in the study *** third-order depositional sequences and related surfaces were identified regarding vertical facies changes in the studied sections of this Oligo-Miocene *** to all results and data,this succession was initially deposited during the Chattian upon a distally steepened ramp of siliciclastic-carbonate composition,including the Bouma ***,from the late Chattian to the Aquitanian,the platform changed into a homoclinal carbonate ramp with a gentle *** respect to tectonic activity,this phase was a calm period during the deposition of the Qom ***,a drowned carbonate platform and a rimmed shelf emerged during the Burdigalian,terminated by the continental deposits of the Upper Red *** all geological characteristics,three main tectono-eustatic evolutionary phases have been recognized in the Qom back-arcbasin.

关键词： carbonate ramp depositional facies submarine fan eustasy basement faults back-arc basin

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Effect of solidification cooling rate on microstructure and tribology characteristics of Zn-4Si alloy

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 362-373页

作者： F.Akbari M.Golkaram S.Beyrami G.Shirazi K.Mantashloo R.Taghiabadi M.Saghafi yazdi I.Ansarian Department of Metallurgy and Material Science Imam Khomeini International University(IKIU)Qazvin ***Iran

The main objective of this work was to modify the microstructure and enhance the tribological properties of a new Zn-4Si al-loy through a high solidification cooling rate(SCR).According to the results,by increasing the SCR from 2.0 to 59.5℃/s the average size of primary Si particles and that of the grains reduced from 76.1 and 3780μm to less than about 14.6 and 460μm,***-ing the SCR also enhanced the microstructural homogeneity,decreased the porosity content(by 50%),and increased the matrix hardness(by 36%).These microstructural changes enhanced the tribological *** instance,under the applied pressure of 0.5 MPa,an in-crease in the SCR from 2.0 to 59.5℃/s decreased the wear rate and the average friction coefficient of the alloy by 57%and 23%,*** wear mechanism was also changed from the severe delamination,adhesion,and abrasion in the slowly-cooled alloy to the mild tribolayer delamination/abrasion in the high-cooling-rate-solidified sample.

关键词： zinc-silicon alloy primary silicon solidification cooling rate tribology sliding wear

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添加不同量促腐熟菌剂对木屑和黄浆水堆肥的影响

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甘肃农业大学学报 2024年第2期59卷 117-126页

作者：杨娜马亚兰顾欣 eftekhari Ali Reza 李思琦李雪雪宁夏大学农学院宁夏银川750021

【目的】以木屑和黄浆水为原料,探讨促腐熟菌剂不同添加量对堆肥进程的影响。【方法】采用好氧发酵罐堆肥试验,设置不加促腐熟菌剂(T_(0))、加促腐熟菌剂质量分数0.1%(T_(1))、0.3%(T_(2))、0.9%(T_(3))共4个处理,以堆肥温度、pH值、种... 详细信息

【目的】以木屑和黄浆水为原料,探讨促腐熟菌剂不同添加量对堆肥进程的影响。【方法】采用好氧发酵罐堆肥试验,设置不加促腐熟菌剂(T_(0))、加促腐熟菌剂质量分数0.1%(T_(1))、0.3%(T_(2))、0.9%(T_(3))共4个处理,以堆肥温度、pH值、种子发芽指数、养分质量分数作为评价指标。采用主成分分析,研究促腐熟菌剂添加量对物料发酵进程和腐熟度的影响,明确最佳添加量。【结果】与T_(0)比较,添加促腐熟菌剂处理提前2 d进入高温期。发酵结束后,各处理的堆肥p H值介于7.46~7.74。添加不同质量分数的促腐熟菌剂可以不同程度地降低堆肥物料的碳、氮损失。与T_(0)相比,T_(1)、T_(2)、T_(3)氮损失分别降低9.41%、14.12%和4.71%,碳损失分别降低3.06%、7.97%和5.89%,其中T_(2)的氮、碳损失最低,分别为75.26%和7.82%。添加促腐熟菌剂的堆肥腐熟度比T_(0)提高3.64%~9.09%,T_(2)最先达到腐熟。【结论】综上所述,在木屑和黄浆水堆肥中添加质量分数0.3%的促腐熟菌剂,能显著促进物料腐熟,有利于降低氮、碳损失,提高堆肥质量,为木屑和黄浆水的肥料化利用提供了依据。

关键词：木屑促腐熟菌剂黄浆水堆肥发酵

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Prediction of mode I fracture toughness of rock using linear multiple regression and gene expression programming

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1421-1432页

作者： Bijan Afrasiabian Mosleh eftekhari Department of Mining Engineering Science and Research BranchIslamic Azad UniversityTehranIran Department of Mining Engineering Faculty of EngineeringTarbiat Modares UniversityTehranIran

Prediction of mode I fracture toughness(KIC) of rock is of significant importance in rock engineering analyses. In this study, linear multiple regression(LMR) and gene expression programming(GEP)methods were used to provide a reliable relationship to determine mode I fracture toughness of rock. The presented model was developed based on 60 datasets taken from the previous literature. To predict fracture parameters, three mechanical parameters of rock mass including uniaxial compressive strength(UCS), Brazilian tensile strength(BTS), and elastic modulus(E) have been selected as the input parameters. A cluster of data was collected and divided into two random groups of training and testing ***, different statistical linear and artificial intelligence based nonlinear analyses were conducted on the training data to provide a reliable prediction model of KIC. These two predictive methods were then evaluated based on the testing data. To evaluate the efficiency of the proposed models for predicting the mode I fracture toughness of rock, various statistical indices including coefficient of determination(R2),root mean square error(RMSE), and mean absolute error(MAE) were utilized herein. In the case of testing datasets, the values of R2, RMSE, and MAE for the GEP model were 0.87, 0.188, and 0.156,respectively, while they were 0.74, 0.473, and 0.223, respectively, for the LMR model. The results indicated that the selected GEP model delivered superior performance with a higher R2value and lower errors.

关键词： Mode I fracture Toughness Critical stress intensity factor Linear multiple regression(LMR) Gene expression programming(GEP)

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A HYBRID VISCOSITY APPROXIMATION METHOD FOR A COMMON SOLUTION OF A GENERAL SYSTEM OF VARIATIONAL INEQUALITIES,AN EQUILIBRIUM PROBLEM,AND FIXED POINT PROBLEMS

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Journal of Computational Mathematics 2023年第1期41卷 153-172页

作者： Maryam yazdi Saeed Hashemi Sababe Young Researchers and Elite Club Malard BranchIslamic Azad UniversityMalardIran Department of mathematical and statistical sciences University of AlbertaEdmontonCanada Young Researchers and Elite ClubMalard BranchIslamic Azad UniversityMalardIran

In this paper,we introduce a new iterative method based on the hybrid viscosity approximation method for finding a common element of the set of solutions of a general system of variational inequalities,an equilibrium problem,and the set of common fixed points of a countable family of nonexpansive mappings in a Hilbert *** prove a strong convergence theorem of the proposed iterative scheme under some suitable conditions on the ***,we apply our main result for ***,we give two numerical results to show the consistency and accuracy of the scheme.

关键词： Equilibrium problem Iterative method Fixed point Variational inequality

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Tiwari-Das nanofluid model for magnetohydrodynamics(MHD)natural-convective flow of a nanofluid adjacent to a spinning down-pointing vertical cone

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Propulsion and Power Research 2018年第1期7卷 78-90页

作者： Mohammad Aghamajidi Mohammad eftekhari yazdi Saeed Dinarvand Ioan Pop Mechanical Engineering Department Islamic Azad UniversityCentral Tehran BranchTehranIran Department of Applied Mathematics Babeş-Bolyai UniversityCluj-Napoca 400084Romania

In this article,the natural-convective flow of an electrically conducting nanofluid adjacent to a spinning down-pointing vertical cone in the presence of transverse magnetic field is *** mathematical model has been formulated based on Tiwari-Das nanofluid *** different types of water-based nanofluid with copper,aluminum oxide(alumina)and titanium dioxide(titania)as nanoparticles are considered in this *** cases of heat transfer analysis are *** are:(i)the spinning cone with prescribed surface temperature and(ii)the spinning cone with prescribed surface heat *** appropriate transformations,the system of partial differential equations is transformed into an ordinary differential system of three equations,which is solved numerically using the fourth-order Runge-Kutta method with shooting *** current solution demonstrates very good agreement with those of the previously published studies in the especial *** effects of the three key thermophysical parameters governing the flow;the nanoparticle volume fraction,the magnetic parameter and the spin parameter on dimensionless velocity and temperature distributions,skin friction coefficient,Nusselt number and entropy generation number are presented graphically and discussed in *** results demonstrate that,the enhancement of heat transfer is a function of particle concentration,small fraction of metallic particles leading to significant changes in all three quantities of skin friction coefficient,local Nusselt number and entropy generation *** results illustrate that selecting alumina and copper as the nanoparticle leads to the minimum and maximum amounts of skin friction coefficient value,and also copper and titania nanoparticles have the largest and lowest local Nusselt ***,it is observed that the magnetic parameter has a decreasing effect on both skin friction coefficient and local Nusselt number and an increasing effect on entropy ge

关键词： Natural-convective flow Spinning verticalcone Nanofluids Entropy generation Tiwari-Das nanofluid model Magnetohy drodynamics(MHD)

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Texture evolution and mechanical anisotropy of an ultrafine/nano-grained pure copper tube processed via hydrostatic tube cyclic expansion extrusion

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2241-2251页

作者： Seyed Moien Faregh Ghader Faraji Mahmoud Mosavi Mashhadi Mohammad eftekhari School of Mechanical Engineering College of EngineeringUniversity of TehranTehran 11155-4563Iran

Texture evolution and mechanical anisotropic behavior of an ultrafine-grained(UFG)pure copper tube processed by recently introduced method of hydrostatic tube cyclic expansion extrusion(HTCEE)was *** the UFG tube,different deformation behavior and a significant anisotropy in tensile properties were recorded along the longitudinal and peripheral *** HTCEE process increased the yield strength and the ultimate strength in the axial direction by 3.6 and 1.67 times,***,this process increased the yield strength and the ultimate strength in the peripheral direction by 1.15 and 1.12 times,*** ratio of ultimate tensile strength in the peripheral direction to that in the axial direction,as a criterion for mechanical anisotropy,are 1.7 and 1.16 for the as-annealed coarse-grained and the HTCEE processed UFG tube,*** results are indicative of a reducing effect of the HTCEE process on the mechanical ***,after HTCEE process,a low loss of ductility was observed in both directions,which is another advantage of HTCEE *** measurements revealed a slight increment of hardness values in the peripheral direction,which is in agreement with the trend of tensile *** analysis was conducted in order to determine the oriental distribution of the *** obtained{111}pole figures demonstrate the texture evolution and reaffirm the anisotropy observed in mechanical *** electron microscopy micrographs showed that different modes of fracture occurred after tensile testing in the two orthogonal directions.

关键词： severe plastic deformation ultrafine grained hydrostatic tube cyclic expansion extrusion anisotropy texture

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Postmiogypsinella intermedia Sirel and Gedik 2011 from the upper Oligocene of Central Iran(Qom Formation):Paleogeography and paleoenvironmental implications

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Journal of Palaeogeography 2023年第2期12卷 246-262页

作者： Mohsen yazdi-Moghadam Mehdi Sarfi Mohammad Sharifi Aliakbar Taghipour National Iranian Oil Company Exploration Directorate Sheikh Bahaie SquareTehran***Iran School of Earth Sciences Damghan UniversityDamghan***Iran Department of Earth Sciences Faculty of SciencesUniversity of KurdistanSanandajIran

Postmiogypsinella intermedia Sirel and Gedik,2011 is reported for the first time from the shallow-marine limestones of the upper Chattian Qom Formation,Central *** miogypsinid species has so far only been recorded from the upper Oligocene of Malatya(type locality)and Sivas(Central Anatolia)in eastern Turkey and from the upper Oligocene of the Prebetic Domain,SE *** new record from Central Iran,paleobiogeographically located at the Eurasian margin of the Tethyan Seaway between the Western and Eastern Tethys realms,indicates that the paleogeographic distribution of this species has to be extended eastwards as far as Central *** observation is not unexpected,since miogypsinid foraminifers with eccentric embryonic-nepionic apparatus(e.g.,Miogypsinella,Miogypsinoides,Miogypsina)are usually widely *** accompanying larger benthic foraminifera,including Miogypsinoides complanatus(Schlumberger),Miogypsinoides formosensis Yabe and Hanzawa,Spiroclypeus margaritatus(Schlumberger),Operculina complanata(Defrance),and Risananeiza pustulosa Boukhary et al.,indicate the late Chattian age(corresponding to SBZ 23 Biozone).Postmiogypsinella intermedia is indicative of a shallow-marine middle ramp environment with oligotrophic conditions and inhabited the relatively deeper part of the photic zone.

关键词： Larger foraminifera Miogypsinidae Biostratigraphy Qom Formation Central Iran

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