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排序方式: 共有157条查询结果,搜索用时 216 毫秒
1.
Shahrbabak Mohammad Sadegh Nabizadeh Sharifianjazi Fariborz Rahban Daruosh Salimi Ali 《SILICON》2019,11(6):2741-2751
Silicon - The bioactive glass systems of xAg2O-SiO2-P2O5-CaO and xZnO-SiO2-P2O5-CaO (x = 2 and 4% mol) were successfully synthesized through sol-gel method. The effect of silver and... 相似文献
2.
Silicon - In this study, bentonite/TiO2 and bentonite/ZnO nanoparticles were used for studying the cadmium removal from the aqueous solution. The experiments were done in a batch condition under... 相似文献
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4.
The transfer of quantum states plays an important role in quantum information processing. In fact, the transfer of a quantum state from point A to point B with unit fidelity has been the center of attention during the last decades. One of the ways to aim this goal is to transfer a quantum state in a spin chain described by designing a Hamiltonian in which a mirror symmetry with respect to the network center is created. In this paper, we introduce a method based on the spectral distribution of the adjacency matrix and stratifying a spin network, with respect to an arbitrary vertex denoted by o which is called starting vertex (reference vertex), to make perfect quantum state transfer possible between antipodes in the spin network. Then we design the coupling coefficients in a way to create a mirror symmetry in the Hamiltonian with respect to the center of the network. In this method the initial state is encoded on the starting vertex and then it is received at its antipode. There is no need to consider any external control in this approach. 相似文献
5.
F. Tabatabaee A. A. Sabbagh Alvani H. Sameie S. Moosakhani R. Salimi M. Taherian 《Metals and Materials International》2014,20(1):169-176
The most effective process parameters were determined to synthesize spherical LaF3 nanoparticles with controllable size based on ethylenediaminetetraacetic acid (EDTA) via co-precipitation technique. Thermogravimetricdifferential thermal analysis, X-ray diffraction, scanning electron microscopy, dynamic light scattering and FT-IR spectroscopy were used to characterize the resulting powders. Detailed investigations revealed that the optimal LaF3 host nano-material was obtained when NH4F was used as a fluoride source in the presence of EDTA at pH = 5. Furthermore, photoluminescence spectra showed an intense double emission peak at 289 and 302 nm for cerium-doped LaF3 nanocrystals excited at 253 nm, which was assigned to the well-known 5d→4f (2F5/2 and 2F7/2) transitions of Ce3+ levels due to luminescence center mechanism. The experimental results indicate that the synthesized LaF3:0.05Ce powders with a band gap of 5.3 eV are promising phosphors for high density scintillators. 相似文献
6.
We introduce a two-parameter version of the two-step scale-splitting iteration method, called TTSCSP, for solving a broad class of complex symmetric system of linear equations. We present some conditions for the convergence of the method. An upper bound for the spectral radius of the method is presented and optimal parameters which minimize this bound are given. Inexact version of the TTSCSP iteration method (ITTSCSP) is also presented. Some numerical experiments are reported to verify the effectiveness of the TTSCSP iteration method and the numerical results are compared with those of the TSCSP, the SCSP and the PMHSS iteration methods. Numerical comparison of the ITTSCSP method with the inexact version of TSCSP, SCSP and PMHSS are presented. We also compare the numerical results of the BiCGSTAB method in conjunction with the TTSCSP and the ILU preconditioners. 相似文献
7.
Saeed Mirian Mohsen safavi Alireza Fadaei Mahmoud Salimi Mahmoud Farzin 《International Journal of Precision Engineering and Manufacturing》2011,12(2):275-284
In this research work, polishing inside, outside and over the cylindrical parts has been done by using a completely new and
innovative method. The work-pieces have been placed on a two-axis Cartesian CNC Table for polishing operations. The Magnetic
Rotary Head continuously changes its rotation direction from CW to CCW and CCW to CW and meanwhile the part begin to oscillate
up-and-down under a High Frequency (20 kHz) conditions. The Frequency of changing direction From CW to CCW and CCW to CW is
one of the important parameters in this method. This method is a kind of Ultrasonic Assisted Polishing (UAP) and novelty of
this research work is combining this method with motion of work piece under CNC trajectory with continuously changing direction
of Magnetic Rotary Head. Gap between Rotary Magnetic Polishing Head and the Work piece Surface can be controlled by a power
transmission screw which operates in the direction of the vertical axis. Several experiments have proved high performance
of this new proposed method in the process of polishing in short times. 相似文献
8.
For the first time a novel, simple and facile approach is described to construct highly stable glucose oxidase (GOx) multilayer onto glassy carbon (GC) electrode using thiourea (TU) as a covalent attachment cross-linker. The layer by layer (LBL) attachment process was confirmed by cyclic voltammetry, electrochemical impedance spectroscopy and Fourier transform infrared reflection spectroscopy (FT-IR-RS) techniques. Immobilized GOx shows excellent electrocatalytic activity toward glucose oxidation using ferrocenemethanol as artificial electron transfer mediator and biosensor response was directly correlated to the number of bilayers. The surface coverage of active GOx per bilayer, heterogeneous electron transfer rate constant (ks) and Michaelis–Menten constant (KM), of immobilized GOx were 1.50 × 10−12 mol cm−2, 9.2 ± 0.5 s−1 and 3.42(±0.2) mM, respectively. The biosensor constructed with four-bilayers of TU/GOx showed good stability, high reproducibility, long life-time, fast amperometric response (5 s) with the high sensitivity of 5.73 μA mM−1 cm−2 and low detection limit of 6 μM at concentration range up to 5.5 mM. 相似文献
9.
Biodegradation of pretreated olive mill effluent in mixture with a domestic sewage or compatible wastewater stream 下载免费PDF全文
10.
Seyed Saeed Mirian Alireza Fadaei Seyed Mohsen Safavi Mahmoud Farzin Mahmoud Salimi 《The International Journal of Advanced Manufacturing Technology》2011,55(5-8):601-610
In this research, polishing flat surfaces has been done by using a completely new and innovative method. In this method, rotary magnetic tool that carry magnetic abrasive powders, is placed in a very strong thermal induction field, and magnetic rotary tool frequently change its direction from clockwise (CW) to counterclockwise (CCW) and CCW to CW. The frequency of changing rotation direction is an important parameter of this innovation method. The intended pieces for polishing operations have been placed on a synchronic two-axis Cartesian CNC table, and the gap between rotary magnetic tool and the sheet surface can be controlled by a power transmission screw operating in the direction of the vertical axis. Several experiments have proved high performance of the new proposed method in the process of polishing. 相似文献