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| 1 | Evaluation of the Electroslag Remelting Process in Medical Grade of 316LC Stainless Steel显示文摘This study is focused on the effects of electroslag remelting by prefused slag(CaO,Al2O3,and CaF2)on macrostructure and reduction of inclusions in the medical grade of 316LC(316LVM)stainless steel.Analysis of the obtained results indicated that for production of a uniform ingot structure during electroslag remelting, shape and depth of the molten pool should be carefully controlled.High melting rates led to deeper pool depth and interior radial solidification characteristics,while decrease in the melting rates caused more reduction of nonmetallic inclusions.Large shrinkage cavities formed during the conventional casting process in the primary ingots were found to be the cause of the fluctuation in the melting rate,pool depth and extension of equiaxed crystals zone. | S.Ahmadi H.Arabi A.Shokuhfar A.Rezaei | 2009 | Journal of Materials Science & Technology2009，25，5： | 6 |
| 2 | Effects of Multiple Strengthening Treatments on Mechanical Properties and Stability of Nanoscale Precipitated Phases in an Aluminum-Copper-Lithium Alloy显示文摘Effects of multiple strengthening treatments(i.e.aging either at three or four consecutive temperatures) on mechanical properties and stability of nanoscale precipitated phases in an AA2090 alloy have been evaluated in this research.Various tests such as hardness,tensile,electrical resistance,differential scanning calorimetric(DSC),and transmission electron microscopy(TEM) have been performed.The results show that the ultimate tensile strength(UTS) and the yield strength of the samples aged at four consecutive temperatures(i.e.natural aging+190℃+150℃+100℃) can be increased approximately to 660 and 610 MPa,respectively.It is also found that precipitation of T1 phase occurs during multiple aging process of the alloy and the higher amounts of enthalpies shown in DSC charts are linked to higher volume fraction of this precipitate.Furthermore,TEM observations reveal that T1 phase has plate shape morphology and its crystal structure is in the form of hcp with lattice parameters of a=0.467 nm and c=0.878 nm. | S.Ahmadi H.Arabi A.Shokuhfar | 2010 | Journal of Materials Science & Technology2010，26，12： | 5 |
| 3 | L^q Inequalities and Operator Preserving Inequalities显示文摘Let Pn be the class of polynomials of degree at most nRather and Shah [15]proved that if P∈Pnand P(z)≠0 in|z|< 1, then for every R > 0 and 0≤q < ∞,|B[ P( Rz)]|q ≤|RnB[zn] + λ0 |q|1 + zn|q|P(z)|q,where B is a Bn-operator.In this paper, we prove some generalization of this result which in particular yields some known polynomial inequalities as specialWe also consider an operator Dαwhich maps a polynomial P(z) into DαP(z) := n P(z) +(α-z) P′(z) and obtain extensions and generalizations of a number of well-known Lq | M.Bidkham S.Ahmadi | 2014 | Analysis in Theory and Applications2014，30，4： | 0 |
| 4 | 用声学技术进行发电机线棒电老化过程中的局部放电检测显示文摘局部放电是检测发电机线棒绝缘状况的有效工具。可以使用多种方法检测发电机线棒的局部放电活动。声学检测局部放电已经得到广泛的应用。与电气检测方法相比,声学检测具有一些优势,例如对电磁场的抗干扰能力。本文中将对空冷发电机线棒(额定电压15.75kV)进行电应力老化试验。电老化试验参照IEEE1553.2002标准执行。每天记录发电机线棒在电老化过程中由局部放电产生的声学信号,电老化时长共计500h。在线棒上选取2点作为测试点。其中1点在线棒的一端,而另1点在线棒的中心。声学传感器的信号输出到80MHz的PC机A/D(模,数)卡中,并用传感器的最大频率带宽进行滤波。老化过程中检测声学信号的变化。(测得的)变化表明在初期(开始的几天)局部放电产生的声学信号幅值增加,随后减小,最后在老化过程中保持恒定。 | S.Ahmadi 冯超 | 2015 | 国外大电机2015，0，2： | 0 |
| 5 | Nonlinear Dust Acoustic Waves in a Magnetized Dusty Plasma with Trapped and Superthermal Electrons显示文摘In this work,the effects of superthermal and trapped electrons on the oblique propagation of nonlinear dust-acoustic waves in a magnetized dusty(complex)plasma are investigated.The dynamic of electrons is simulated by the generalized Lorentzian(κ)distribution function(DF).The dust grains are cold and their dynamics are simulated by hydrodynamic equations.Using the standard reductive perturbation technique(RPT)a nonlinear modified Korteweg-de Vries(mKdV)equation is derived.Two types of solitary waves;fast and slow dust acoustic solitons,exist in this plasma.Calculations reveal that compressive solitary structures are likely to propagate in this plasma where dust grains are negatively(or positively)charged.The properties of dust acoustic solitons(DASs)are also investigated numerically. | S.Ahmadi ABRISHAMI M.Nouri KADIJANI | 2014 | Plasma Science and Technology2014，16，6： | 0 |
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