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Search Results: 1 - 10 of 33088 matches for " Mao-fa Jiang "
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The population and decay evolution of a qubit under the time-convolutionless master equation

Huang Jiang,Fang Mao-Fa,Liu Xiang,

中国物理 B , 2012,
Abstract: We consider the population and decay of a qubit under the electromagnetic environment. Employing the time-convolutionless master equation, we investigate the Markovian and non-Markovian behaviour of the corresponding perturbation expansion. The Jaynes-Cummings model on resonance is investigated. Some figures clearly show the different evolution behaviours. The reasons are interpreted in the paper.
Decomposition mechanism of chromite in sulfuric acid–dichromic acid solution
Qing Zhao,Cheng-jun Liu,Bao-kuan Li,Mao-fa Jiang
- , 2017, DOI: https://doi.org/10.1007/s12613-017-1528-9
Abstract: The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chromite; however, the decomposition mechanism of the ore is poorly understood. In this work, binary spinels of Mg–Al, Mg–Fe, and Mg–Cr in the powdered and lump states were synthesized and used as raw materials to investigate the decomposition mechanism of chromite in sulfuric acid–dichromic acid solution. The leaching yields of metallic elements and the changes in morphology of the spinel were studied. The experimental results showed that the three spinels were stable in sulfuric acid solution and that dichromic acid had little influence on the decomposition behavior of the Mg–Al spinel and Mg–Fe spinel because Mg2+, Al3+, and Fe3+ in spinels cannot be oxidized by Cr6+. However, in the case of the Mg–Cr spinel, dichromic acid substantially promoted the decomposition efficiency and functioned as a catalyst. The decomposition mechanism of chromite in sulfuric acid–dichromic acid solution was illustrated on the basis of the findings of this study.
Effect of continuous casting speed on mold surface flow and the related near-surface distribution of non-metallic inclusions
Peng Fei,Yi Min,Cheng-jun Liu,Mao-fa Jiang
- , 2019, DOI: https://doi.org/10.1007/s12613-019-1723-y
Abstract: For the control of surface defects in interstitial-free (IF) steel, quantitative metallographic analyses of near-surface inclusions and surface liquid flow detection via the nail-board tipping method were conducted. The results show that, at casting speeds of 0.8 and 1.0 m/min, a thin liquid mold flux layer forms and non-uniform floating of argon bubbles occurs, inducing the entrainment and subsequent entrapment of the liquid flux; fine inclusion particles of Al2O3 can also aggregate at the solidification front. At higher casting speeds of 1.4 and 1.6 m/min, the liquid mold flux can be entrained and carried deeper into the liquid steel pool because of strong level fluctuations of the liquid steel and the flux. The optimal casting speed is approximately 1.2 m/min, with the most favorable surface flow status and, correspondingly, the lowest number of inclusions near the slab surface.
Dissolution Behavior of Chromium Ore in CaO-SiO2-MgO-Al2O3 Slag System
铬矿在CaO-SiO2-MgO-Al2O3渣系中的熔解行为

LIU Yan,JIANG Mao-fa,XU Li-xian,
刘岩
,姜茂发,许力贤

过程工程学报 , 2007,
Abstract: The dissolution behavior of compact chromium ore with definite shape in CaO-SiO2-MgO-Al2O3 slag system was studied, and the effect of different slag compositions on the dissolution amount and rate of chromium ore in slag was investigated. The dissolution mechanism of chromium ore in slag was also discussed. It was found that the dissolution rate of chromium ore in slag increased with slag basicity decreasing under the present experimental conditions. The dissolution amount and rate of chromium ore decreased with the increase of Al2O3 and MgO contents. In particular, they decreased with the former. Addition of CaF2 to the initial slag increased the dissolution rate markedly.
Efficient scheme of quantum SWAP gate and multi-atom cluster state via cavity QED
Jiang Chun-Lei,Fang Mao-Fa,Hu Yao-Hua,
姜春蕾
,方卯发,胡要花

中国物理 B , 2008,
Abstract: In this paper, we propose a physical scheme to realize quantum SWAP gate by using a large-detuned single-mode cavity field and two identical Rydberg atoms. It is shown that the scheme can also be used to create multi-atom cluster state. During the interaction between atom and cavity, the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay. With the help of our scheme it is very simple to prepare the $N$-atom cluster state with perfect fidelity and probability. The practical feasibility of this method is also discussed.
Growth and aggregation control of spinel by shear-force-based melting modification of stainless steel slag
Qing Zhao,Cheng-jun Liu,Tian-ci Gao,Long-hu Cao,Mao-fa Jiang
- , 2018, DOI: https://doi.org/10.1007/s12613-018-1665-9
Abstract: To improve the efficiency of melting modification for stainless steel (SS) slag, a shear force was introduced in this work and its effects on the spinel and silicate melt were experimentally investigated. The results indicated that the use of shear force changed the nucleation and growth behaviors of spinel and that the effects of shear force varied with its intensity. The aggregation behavior of spinel under different shear-force conditions was studied, revealing that large spinel clusters could be formed when the stirring speed was controlled. However, no notable change in the melt structure of the silicate was detected in this study. The optimal stirring speed for the melting modification treatment was 50 r·min?1, which substantially promoted spinel growth and aggregation, resulting in modified SS slag with excellent chromium sequestration capability.
The entanglement dynamics of two entangled atoms in the dissipative cavity
双纠缠原子在耗散腔场中的纠缠动力学

Jiang Chun-Lei,Fang Mao-Fa,Wu Zhen-Zhen,
姜春蕾
,方卯发,吴珍珍

物理学报 , 2006,
Abstract: In this paper, we investigate the entanglement dynamics of two entangled two-level atoms interacting with a single-mode field in a dissipative cavity. The results show that the evolution properties of the entanglement degree of two entangled atoms depend on the initial atomic entanglement degree and form, the average photon number of the cavity field, and the cavity leakage rate. When the atoms are initially in a particular entangled state, the degree of entanglement can be amplified and not influenced by the dissipation of the cavity field.
Entanglement concentration for multi-atom GHZ class state via cavity QED
Jiang Chun-Lei,Fang Mao-Fa,Zheng Xiao-Juan,
姜春蕾
,方卯发,郑小娟

中国物理 B , 2006,
Abstract: In this paper, we propose a physical scheme to concentrate non-maximally entangled atomic pure states by using atomic collision in a far-off-resonant cavity. The most distinctive advantage of our scheme is that the non-maximally entangled atoms may be far from or near each other and their degree of entanglement can be maximally amplified. The photon-number-dependent parts in the effective Hamiltonian are cancelled with the assistance of a strong classical field, thus the scheme is insensitive to both the cavity decay and the thermal field.
Sulfuric acid leaching kinetics of South African chromite
Qing Zhao,Cheng-jun Liu,Pei-yang Shi,Bo Zhang,Mao-fa Jiang,Qing-song Zhang,Ron Zevenhoven,Henrik Saxén
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1066-2
Abstract: The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a proportional relationship. A modified shrinking particle model was developed to account for the change in reactive surface area, and the model was fitted to experimental data. The resulting model was observed to describe experimental findings very well. Kinetics analysis revealed that the leaching process is controlled by a chemical reaction under the employed experimental conditions and the activation energy of the reaction is 48 kJ·mol?1.
The entanglement of two moving atoms interacting with a single-mode field via a three-photon process

Wu Chao,Fang Mao-Fa,

中国物理 B , 2010,
Abstract: In this paper, the entanglement of two moving atoms induced by a single-mode field via a three-photon process is investigated. It is shown that the entanglement is dependent on the category of the field, the average photon number N, the number p of half-wave lengths of the field mode and the atomic initial state. Also, the sudden death and the sudden birth of the entanglement are detected in this model and the results show that the existence of the sudden death and the sudden birth depends on the parameter and the category of the mode field. In addition, the three-photon process is a higher order nonlinear process.
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