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Unveiling the influence of dendrite characteristics on the slip/twinning activity and the strain hardening capacity of mg-Sn-Li-Zn cast alloys

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Journal of magnesium and Alloys 2023年第1期11卷 329-347页

作者： mS.jalali A.Zarei-Hanzaki m.mosayebi H.R.Abedi m.malekan m.Kahnooji E.Farabi Su-Hyeon Kim Hot Deformation and Thermomechanical Processing Laboratory of High Performance Engineering materials School of Metallurgy and Materials EngineeringCollege of EngineeringUniversity of TehranTehranIran materials Science and Engineering Department McMaster University1280 Main Street WestHamiltonON L8S 4L8Canada School of metallurgy&materials Engineering Iran University of Science and Technology(IUST)TehranIran Institute for Frontier materials Deakin UniversityGeelongVictoria 3216Australia Korea Institute of materials Science(KImS) 797 ChangwondaeroSeongsanguChangwonGyeongnam 51508Republic of Korea

This work explores the correlation between the characteristics of the cast structure(dendrite growth pattern,dendrite morphology and macro-texture)and strain hardening capacity during high temperature deformation of mg-5Sn-0.3Li-0 and 3Zn multi-component *** three dimensional(3D)morphology of the dendrite structure demonstrates the transition of the growth directions from,andtoanddue to the addition of *** simultaneous effects of growing tendency and the decrement of dendrite coarsening rate at the solidification interval lead to dendrite morphology transition from the globular-like to the hyper-branch *** morphology transition results in the variation of the solidification macro-texture,which has effectively influenced the dominant deformation mechanisms(slip/twin activity).The higher activity of the slip systems increases the tendency of the dendrite arms for bending along the deformation direction and *** from this,the dendrite holding hyper-branch structure with an average thickness below 20μm are more favorable for *** dendrite fragmentation leads to considerable softening fractions,and as an effective strain compensation mechanism increases the workability of dendritic structure.

关键词： magnesium alloys Dendrite orientation selection Solidification texture Dendrite fragmentation 3-D tomography analysis Thermomechanical processing

multivariate Statistical Analysis of Potassium Status in Agricultural Soils in Hamadan,Western Iran

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Pedosphere 2010年第3期20卷 293-303页

作者： m. jalali Department of Soil Science College of AgricultureBu-Ali Sina University

multivariate statistical technique was used to determine the potassium (K+) status and to assess soil fertility and K leaching potential in some calcareous soils. Water-soluble K+ (H2O-K) and ammonium acetate-extractable K+ (NH4OAc-K) ranged from 0.019 to 0.590 (mean value 0.095) and 0.390 to 3.320 (mean value 0.954) cmolc kg-1, respectively. The nitric acid-extractable K+ (HNO3-K) varied from 1.03 to 13.63 (mean value 5.37) cmolc kg-1. The proportion of H2O-K ranged from 0.34% to 14.8% of HNO3-K, and 2.2% to 53.2% of NH4OAc-K. The proportion of NH4OAc-K ranged from 5.8% to 80% of HNO3-K (mean value 23% of HNO3-K). The tendency of the soil to lose K+ by leaching was examined by determining K+-Ca2+ exchange isotherms. The soils mostly had moderate to high values of K+ sorption capacity, ranging from 10% to 58% (mean value 28%) of added K+. The Gapon coefficient varied widely from 1.1 to 12.0 (L mol-1)-1/2. Clay minerals were dominated by illite, smectites and vermiculite with small amounts of kaolinite. Principal component analysis (PCA) showed that the first four components accounted for 27.7%, 21.4%, 13.8%, and 8.9% of total variation, respectively. The non-hierarchical cluster analysis (k-means clustering) grouped 75 sampling sites into six clusters, based on the similarity of soil quality characteristics. The results suggested that such classes could form a basis for variable-rate application to maintain an adequate K+ status for crop production and to reduce potential K+ loss from soil by leaching.

关键词：土壤钾素状况多元统计分析农业西部伊朗

Recent progress and perspective in additive manufacturing of EmI shielding functional polymer nanocomposites

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Nano Research 2023年第1期16卷 1-17页

作者： Amirjalal jalali Ruiyan Zhang Reza Rahmati mohammadreza Nofar mohini Sain Chul B.Park Center for Biocomposites&Biomaterials Processing John H.Daniels Faculty of ArchitectureLandscapeand DesignUniversity of TorontoTorontoOntario M5S 3B3Canada microcellular Plastics manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King's College RoadTorontoOntario M5S 3G8Canada State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Key Laboratory of Photovoltaic MaterialsSchool of Materials and New EnergyNingxia UniversityYinchuan 750021China metallurgical&materials Engineering Department Faculty of Chemical and Metallurgical EngineeringIstanbul Technical UniversityMaslakIstanbul 34469Turkey

Because of rapid progress in the electronics industry,the market has faced a huge demand for novel materials in the field of electromagnetic interference(EmI)*** functional polymer composites have demonstrated great potential to fulfill this *** synthesize the polymeric composites,functional conductive nanoadditives such as graphene,carbon nanotubes,and mXene are commonly added to polymeric matrices,and the conductive polymer nanocomposites exhibit promising electrical conductivity as well as EmI shielding *** manufacturing(Am),also referred to as threedimensional(3D)printing,has been increasingly employed to fabricate complicated geometry components in the medical,aerospace,and automotive *** has also been used to fabricate advanced EmI shielding materials for sensors,supercapacitors,energy storage devices,and flexible *** review aims at introducing the different 3D printing methods applied for the fabrication of EmI shielding polymer *** impact of the Am process on the functionality of the samples is also ***,the influence of the nanofiller type and amount on the microstructure and performance of the fabricated nanocomposites is ***,the prospects and recommended works for future study are outlined.

关键词： additive manufacturing electromagnetic interference(EmI)shielding functional polymer nanocomposites stretchable electronics

第三代铰链聚乙烯在初次人工髋关节置换术后的磨损:一项10年研究

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临床骨科杂志 2024年第1期27卷 39-39页

作者： jalali O FISKE J DEJARDIN m 胡孔足(摘译) 不详

作者分析了133例第三代铰链聚乙烯在初次人工髋关节置换术后的磨损原因。平均随访10.4(8~13.4)年。平均线性磨损为0.0172 mm/年,平均容积磨损为16.99 mm^(3)/年。没有发现明显的骨溶解和假体松动,髋臼假体生存率为100%。患者年轻和使用... 详细信息

作者分析了133例第三代铰链聚乙烯在初次人工髋关节置换术后的磨损原因。平均随访10.4(8~13.4)年。平均线性磨损为0.0172 mm/年,平均容积磨损为16.99 mm^(3)/年。没有发现明显的骨溶解和假体松动,髋臼假体生存率为100%。患者年轻和使用偏心内衬是加速磨损的主要因素。

关键词：骨溶解人工髋关节置换术后假体松动髋臼假体第三代聚乙烯铰链磨损原因

Barut-Girardello and Gilmore-Perelomov coherent states for pseudoharmonic oscillators and their nonclassical properties: Factorization method

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Chinese Physics B 2013年第8期22卷 421-428页

作者： m K Tavassoly H R jalali Atomic and molecular Group Faculty of Physics Yazd UniversityYazd Iran Photonics Research Group Engineering Research Center Yazd UniversityYazd Iran The Laboratory of Quantum Information Processing Yazd UniversityYazd Iran

In this paper we try to introduce the ladder operators associated with the pseudoharmonic oscillator, after solving the corresponding Schrrdinger equation by using the factorization method. The obtained generalized raising and lowering operators naturally lead us to the Dirac representation space of the system which is much easier to work with, in comparison to the functional Hilbert space. The SU（1, 1） dynamical symmetry group associated with the considered system is exactly established through investigating the fact that the deduced operators satisfy appropriate commutation relations. This result enables us to construct two important and distinct classes of Barut-Girardello and Gilmore-Perelomov coherent states associated with the system. Finally, their identities as the most important task are exactly resolved and some of their nonclassical properties are illustrated, numerically.

关键词： pseudoharmonic oscillator factorization method Barut-Girardello coherent states Gilmore-Perelomov coherent states nonclassical properties

Effect of polyethylene glycol on the crystallization,rheology and foamability of poly(lactic acid)containing in situ generated polyamide 6 nanofibrils

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2074-2087页

作者： Yuhui Qiao Qian Li Amirjalal jalali Dongsheng Yu Xichan He Xiaofeng Wang Jing Jiang Zhiyu min Department of materials Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Henan Province International Joint Laboratory of materials for Solar Energy Conversion and Lithium Sodium Based Battery Luoyang Institute of Science and TechnologyLuoyang 471023China National Center for International Research of micro-Nano molding Technology Zhengzhou 450001China microcellular Plastics manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of TorontoToronto M5S 3G8Canada School of mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

In this study,the rheological properties,crystallization and foaming behavior of poly(lactic acid)with polyamide 6 nanofibrils were examined with polyethylene glycol as a *** 6 particles were deformed into nanofibrils during *** the 10%polyamide 6 case,polyethylene glycol addition reduced the polyamide 6 fibril diameter from 365.53 to 254.63 nm,owing to the smaller polyamide 6 particle size and enhanced interface *** experiments revealed that the viscosity and storage modulus of the composites were increased,which was associated with the three-dimensional entangled network of polyamide 6 *** presence of higher aspect ratio polyamide 6 nanofibrils substantially enhanced the melt strength of the *** isothermal crystallization kinetics results suggested that the polyamide 6 nanofibrils and polyethylene glycol had a synergistic effect on accelerating poly(lactic acid)*** the polyethylene glycol,the crystallization half-time reduced from 103.6 to 62.2 *** foaming results indicated that owing to higher cell nucleation efficiency,the existence of polyamide 6 nanofibrils led to a higher cell density and lower expansion ***,the poly(lactic acid)/polyamide 6 foams exhibited a higher cell density and expansion ratio than that of the foams without polyethylene glycol.

关键词： poly(lactic acid) foaming microfibrillation rheological property crystallization

Assessment of mobile and potential mobile trace elements extractability in calcareous soils using different extracting agents

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 109-125页

作者： mohsen jalali Ziba Hurseresht Department of Soil Science College of AgricultureBu_Ali Sina UniversityHamedanIran

Understanding trace elements mobility in soils,extracting agents,and their relationships with soil components,are essential for predicting their movement in soil profile and availability to plants.A laboratory study was conducted to evaluate extractability of cadmium(Cd),cobalt(Co),copper(Cu),nickel(Ni),and zinc(Zn)from calcareous soils utilizing various extracting agents to be specific CaCU,DTPA,EDTA,HNO3,mgCl2,NaN03,NH4NO3,and *** analysis indicated that DTPA and NH4OAc,HN03 and EDTA,and m gCl2 and NH4NO3 extracting agents yielded comparative values,whereas NaN03 and CaCl2 have shown different behavior than other extracting agents for all studied trace *** speciationof extracted trace elements in solutions indicated that in the CaCl2,NaN03,NH4NO3,and mgCl2 extracting agents most extracted Cd,Co,Ni,Zn,and part f Cu were as free ions and may be re-adsorbed on soils,leading to lower extractability,whereas,in the caseof HNO3 extracting agent,the likelihoodof re-adsorptionof trace elements may be *** resultsof speciationof trace elements using NH4OAc DTPA,and EDTA extracting agents showed that me-(Acetate)3,me-(Acetate)2(aq),me(DTPA)3-3-,me(EDTA)2-.and meH(EDTA)-complexes dominated in solutions indicating that the extracted trace elements may not be re-adsorbed on soils,leading to higher *** resultsof this study are useful for short and long-term evaluationsof trace elements mobility and further environmental impacts.

关键词： mobility Calcareous soils Extracting agents Trace elements

Coherence of SH-waves near a semi-circular inclusion-the role of interference and standing waves

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Earthquake Engineering and Engineering Vibration 2021年第3期20卷 535-552页

作者： Z.Tokmechi R.S.jalali m.D.Trifunac m.I.Todorovska Department of Civil Engineering Faculty of EngineeringUniversity of GuilanP.O.Box 3756RashtIran Department of Civil Engineering University of Southern CaliforniaLos AngelesCalifornia 90089USA Department of Civil Engineering Tianjin UniversityTianjin 300350China

We present examples of a controlled numerical experiment that contribute towards understanding of the physical phenomena that lead to the reduction of coherency of strong earthquake ground *** show examples for separation distance of 100 m between the two points on the ground surface,which is in the range of engineering *** examples illustrate the consequences of:(a)standing waves that result from interference of the incident and reflected waves from a near vertical contrast in material properties,(b)standing waves within a concave inhomogeneity(a semi-circular valley in our examples),and(c)smaller motions in the diffraction zone,behind the *** show that it is possible to reduce coherency,to the extent observed for recorded strong earthquake ground motion,even by a single inclusion in a half space,for incident ground motion that is *** also illustrate the combined effects of geometric spreading and finite fault width,superimposed on the otherwise dominating effects caused by *** examples show reduction of coherence for specific angles of incident waves,while,for other angles of incidence,the coherence remains essentially equal to one.

关键词： coherence of strong motion coherence in the presence of standing waves coherence caused by interference reduction of coherence for radiation from large faults

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Journal of Rare Earths 2018年第10期36卷 1106-1111页

作者： Sardar Ahmad m.Shafiq Rashid Ahmad S.jalali-Asadabadi Iftikhar Ahmad Department of Chemistry University of Malakand Center for Computational materials Science University of Malakand Department of Physics Abbottabad University of Science and Technology Department of Physics Faculty of SciencesUniversity of Isfahan

In this paper, we explored the structural, elastic and mechanical properties of the strongly correlated electron systems, intermetallic Ln-Au（Ln = Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu） in cubic structure,using PF-LAPW method within the density functional theory. Structural properties of these intermetallics were investigated by treating the exchange-correlation potential with the GGA-PBE, GGA-PBEsol and GGA ＋ U. The effectiveness of the U for the structural properties as compared to other methods confirms the strong correlated nature of these compounds and the calculated lattice constants endorse the divalency of Yb. The results demonstrate the stable cubic CsCl structure of these compounds. Bulk modulus, Young＇s modulus, shear modulus, B/G ratio, Cauchy pressure, Poisson＇s ratio, anisotropic ratio,Kleinman parameters and Lame＇s coefficients were studied using the PBEsol to evaluate their importance in various types of engineering applications. The most prominent features of these compounds are their ductility, very high melting points, resistance to corrosion, and anisotropic nature.

关键词： Strongly correlated electron systems Rare-earth monoaurides mechanical properties Ab-initio calculation