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Kamali, Ali Reza,Kim, Hyun-Kyung,Kim, Kwang-Bum,Vasant Kumar, R.,Fray, Derek J. The Royal Society of Chemistry 2017 Journal of materials chemistry. A, Materials for e Vol.5 No.36
<▼1><P>High quality graphene nanosheets produced in molten salts were found to be capable of wrapping silicon nanoparticles, leading to the fabrication of graphene encapsulated silicon nanoparticles with an excellent stable electrochemical performance as anode material for Li-ion batteries.</P></▼1><▼2><P>Graphite, which is commercially used as anode material in Li-ion batteries, has a low theoretical capacity of 372 mA h g<SUP>−1</SUP>, and therefore should be replaced by an alternative with high capacity and cyclability for the automotive and other applications. The new material should also be capable of being fabricated by energy efficient non-polluting methods at a reasonable cost. This paper reports on the fabrication of a graphene–silicon nanocomposite which meets all these characteristics. High quality graphene was scalably produced by exfoliation of graphite in molten lithium chloride. Graphene nanosheets produced were found to be capable of wrapping silicon nanoparticles injected into the molten salt, leading to the fabrication of graphene encapsulated silicon nanoparticles with a controllable chemical composition. The electrochemical performance of graphene encapsulated silicon nanoparticles was evaluated and compared with that of Si nanoparticles and mechanically blended Si/graphene. The graphene encapsulated silicon nanoparticles exhibited an excellent stable electrochemical lithiation/delithiation performance with the capacity value of about 2000 mA h per gram of silicon at a high current density of 0.5 A g<SUP>−1</SUP>. The nanocomposite sample containing 50 wt% Si showed a reversible capacity of 981 mA h g<SUP>−1</SUP> after 260 cycles. By increasing the amount of Si content of the nanocomposite to 91 wt%, the reversible stable capacity increased to 2217 mA h g<SUP>−1</SUP>, demonstrating the capability of the molten salt method to correlate the cost and electrochemical performance of the graphene–silicon nanocomposite product.</P></▼2>
A COMPARATIVE STUDY OF THE IRANIAN TOWERS OF THE SALJUQS AND THE CHINESE PAGODAS OF THE SONG DYNASTY
KAMALI, MARYAM Academia Via Serica 2016 Acta Via Serica Vol.1 No.1
This article compares two Iranian towers (burj) of the Saljuq period (c.1037-1194) with two Chinese Pagodas (t'a) of the Song dynasty (c.960-1279) in order to identify common cultural trends in medieval Iranian and Chinese architecture. To this end, the Iranian towers of Tuqrul in Rayy and Chihil Dukhtar in Damghan are compared with their Chinese counterparts of the Iron Pagoda in Kaifeng and the Pizhi Pagoda in Changqing. The two Iranian towers have much simpler architectural decorations compared to the splendid Song pagodas, which are decorated with statues and colorful paintings. The similarities in form, however, suggest common functions provided by the architecture. Both the Saljuq and Song towers had astronomical and military functions, position identification for travelers, and symbolic meanings, as well as their main functions as tombs. By applying comparative studies on the forms and functions of the Tuqrul and Chihil Dukhtar towers on the one hand, and the Iron and Pizhi Pagodas, on the other hand, this article aims to contribute new insights regarding common social trends shared by the medieval Iranian and Chinese and illustrated by their architecture. Extensive and distinguished publications on the general subject of art and architecture during the reign of the two dynasties under discussion already exist, as fully referenced below, but the specific comparative themes regarding the individual sites discussed here are the first in any study of this kind.
ON A SUBCLASS OF CERTAIN STARLIKE FUNCTIONS WITH NEGATIVE COEFFICIENTS
Kamali, Muhammet,Orhan, Halit Korean Mathematical Society 2004 대한수학회보 Vol.41 No.1
A certain subclass $T_{\Omega}(n,\;p,\;\lambda,\;\alpha)$ of starlike functions in the unit disk is introduced. The object of the present paper is to derive several interesting properties of functions belonging to the class $T_{\Omega}(n,\;p,\;\lambda,\;\alpha)$. Coefficient inequalities, distortion theorems and closure theorems of functions belonging to the class $T_{\Omega}(n,\;p,\;\lambda,\;\alpha)$ are determined. Also we obtain radii of convexity for the class $T_{\Omega}(n,\;p,\;\lambda,\;\alpha)$. Furthermore, integral operators and modified Hadamard products of several functions belonging to the class $T_{\Omega}(n,\;p,\;\lambda,\;\alpha)$ are studied here.
Drug- and Gene-eluting Stents for Preventing Coronary Restenosis
Kamali Manickavasagam Lekshmi,Hui-Lian Che,조정수,박인규 전남대학교 의과학연구소 2017 전남의대학술지 Vol.53 No.1
Coronary artery disease (CAD) has been reported to be a major cause of death worldwide. Current treatment methods include atherectomy, coronary angioplasty (as a percutaneous coronary intervention), and coronary artery bypass. Among them, the insertion of stents into the coronary artery is one of the commonly used methods for CAD, although the formation of in-stent restenosis (ISR) is a major drawback, demanding improvement in stent technology. Stents can be improved using the delivery of DNA, siRNA, and miRNA rather than anti-inflammatory/anti-thrombotic drugs. In particular, genes that could interfere with the development of plaque around infected regions are conjugated on the stent surface to inhibit neointimal formation. Despite their potential benefits, it is necessary to explore the various properties of gene-eluting stents. Furthermore, multifunctional electronic stents that can be used as a biosensor and deliver drug- or gene-based on physiological condition will be a very promising way to the successful treatment of ISR. In this review, we have discussed the molecular mechanism of restenosis, the use of drug- and gene-eluting stents, and the possible roles that these stents have in the prevention and treatment of coronary restenosis. Further, we have explained how multifunctional electronic stents could be used as a biosensor and deliver drugs based on physiological conditions
An Adaptive Controller Design for Linear State-Delay Systems with Actuator Failures
Marzieh Kamali,Javad Askari,Farid Sheikholeslam 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.3
In this paper, an adaptive fault tolerant controller is developed for a class of linear state delay systems against actuator failures. To design the controller, all parameters of the system are considered to be unknown, but the time delay value is assumed to be known. Actuator failures are characterized by some unknown system inputs are stuck at some unknown fixed values and at unknown time instants. The adaptive controller is designed based on SPR-Lyapunov approach for the cases with the relative degrees of one and two. Closed-loop system stability and asymptotic output tracking are proved using a suitable Lyapunov-Krasovskii functional for each case and the effectiveness of the proposed results has been illustrated through simulation studies.
On a subclass of certain starlike functions with negative coefficients
Muhammet Kamali,Halit Orhan 대한수학회 2004 대한수학회보 Vol.41 No.1
A certain subclass T_{Omega }(n,p,lambda ,alpha )of starlikefunctions in the unit disk is introduced. The object of thepresent paper is to derive several interesting properties offunctions belonging to the class T_{Omega }(n,p,lambda ,alpha). Coefficient inequalities, distortion theorems and closuretheorems of functions belonging to the class T_{Omega}(n,p,lambda ,alpha ) are determined. Also we obtain radii ofconvexity for the class T_{Omega }(n,p,lambda ,alpha ).Furthermore, integral operators and modified Hadamard products ofseveral functions belonging to the class T_{Omega }(n,p,lambda,alpha ) are studied here.
Salman Kamali,Harry Far 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.2
Defl ection of the steel I-sections is an important phenomenon that needs to be taken into account to ensure that the serviceability limit state criteria of the Australian Standards are met. The method that is widely used to calculate the defl ection of steel I-sections is by the use of existing formulae that only accommodate the bending stiff ness of the beams. A numerical investigation is performed in this study to fi nd the contribution of shear eff ects in the fi nal defl ection of the Welded-Beams (WB) and Welded-Columns (WC). The numerical analyses were carried out in SAP2000 and numerical model was fi rst validated using the experimental results of welded plate girders. The model was then used to analyse simply supported WB and WC sections under uniformly distributed load (UDL) with varying span lengths. The results of the numerical analyses are reported in this study which compare the mid-span defl ection values from the simply supported defl ection formula with the numerical model defl ection values. The data acquired from the numerical analyses were used to establish a span to depth ratio for WB and WC sections below which the shear defl ection becomes signifi cant. The analysis of the results obtained from the numerical investigation suggests that a predication error begins to emerge in the result that is acquired from fl exure defl ection formulae at a certain span-depth ratio.