排序方式: 共有57条查询结果,搜索用时 13 毫秒
21.
Akbar Tayebi Mohammad Shahbazi Nia Esmaeil Peyghan 《Linear algebra and its applications》2012,437(2):675-683
In this paper, we characterize locally dually flat generalized m-th root Finsler metrics. Then we find a condition under which a generalized m-th root metric is projectively related to a m-th root metric. Finally, we prove that if a generalized m-th root metric is conformal to a m-th root metric, then both of them reduce to Riemannian metrics. 相似文献
22.
A. Tayebi A. Nankali E. Peyghan 《Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences)》2014,49(4):184-193
We prove that every m-th root metric with isotropic mean Berwald curvature reduces to a weakly Berwald metric. Then we show that an m-th root metric with isotropic mean Landsberg curvature is a weakly Landsberg metric. We find necessary and sufficient condition under which conformal β-change of anm-th root metric is locally dually flat. Finally, we prove that the conformal β-change of locally projectively flat m-th root metrics are locally Minkowskian. 相似文献
23.
E. Peyghan A. Tayebi A. Ahmadi 《Journal of Mathematical Analysis and Applications》2012,391(1):159-169
The Cauchy problem of the Landau equation with potential forces on torus is investigated. The global existence of solutions with the symmetry of origin and the exponential convergence rate in time to the steady state are obtained for any initially smooth, periodic, origin symmetric small perturbation. 相似文献
24.
Josefa Gomez Abdelhamid Tayebi Antonio del Corte Oscar Gutierrez Jose Manuel Gomez Francisco Saez de Adana 《Wireless Personal Communications》2013,72(4):2931-2944
A comparative study, based on three different measurements (direction of ray arrival, time difference of arrival and received signal strength), to compute the unknown position of mobile stations in indoor environments is presented in this paper. The comparison is carried out considering the results of analyses in a real building in Madrid. To overcome the problems that arise in indoor areas due to the presence of non line of sight conditions, the fingerprinting technique is applied in each of the cases. Data for computations are provided by a simulation tool based on the uniform theory of diffraction and ray-tracing techniques. This information is stored in the fingerprinting database and contains information related to every mobile station, every reference node and every access point located inside the environment under analysis. Experimental results compare the mean error when localizing several mobile stations by using the three different approaches. The goal is to obtain high precision in the localization by means of alternative methods to the received signal strength classical measurement. These techniques will be useful in critical environments where high operational security requirement are demanded. 相似文献
25.
Mehdi Razavi Mohammadhossein Fathi Omid Savabi Daryoosh Vashaee Lobat Tayebi 《Surface and interface analysis : SIA》2014,46(6):387-392
Magnesium alloys are promising biomaterials as biodegradable implant for orthopedic applications. However, their low corrosion resistance and poor bioactivity have prohibited their implant applications. In order to enhance these two properties, a nano‐grain merwinite coating was prepared on magnesium alloy. Its corrosion and the bioactivity behavior were characterized with electrochemical and immersion tests. The results showed that the nano‐grain merwinite coating can improve both the corrosion resistance and the bioactivity of the magnesium alloy making it an appropriate material for biodegradable bone implants. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Structural and electronic properties of the BxIn1−xAs ternary alloy are studied using the tight binding method. The optical band gap bowing is calculated for the first time in the full range of Boron composition x. It is found to be strong. A small deviation from virtual crystal approximation is found for the bond length. New results on elastic constants are reported. The obtained results are in good agreement with the available data in the literature. 相似文献
28.
H. Farajollahi M. Setare F. Milani F. Tayebi 《General Relativity and Gravitation》2011,43(6):1657-1669
In this paper we consider FRW cosmology in F(R,f){F(R,\phi)} gravity. It is shown that in particular cases the bouncing behavior may appears in the model whereas the equation of state
(EoS) parameter may crosses the phantom divider. For the dynamical universe, quantitatively we also find parameters in the
model which satisfies two independent tests:the model independent Cosmological Redshift Drift (CRD) test and the type Ia supernova
luminosity distances. 相似文献
29.
This paper deals with robust iterative learning control design for uncertain single-input-single-output linear time-invariant systems. The design procedure is based upon solving the robust performance condition using the Youla parameterization and the mu-synthesis approach to obtain a feedback controller. Thereafter, a convergent iterative learning law is obtained by using the performance weighting function involved in the robust performance condition. Experimental results, on a CRS465 robot manipulator, are provided to illustrate the effectiveness of the proposed design method. 相似文献
30.
Sakineh Asghari Zhila Tayebi Ahmad Khabbazi Habibi 《Journal of heterocyclic chemistry》2013,50(4):874-878
tert‐Butyl isocyanide reacts with α‐chloroketones in the presence of alkyl propiolates in one pot to afford functionalized γ‐iminolactones as sole product in good yields. 相似文献