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Search Results: 1 - 10 of 16225 matches for " Jianbing Qi "
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Electromagnetically induced transparency in an inverted Y-type four-level system
Jianbing Qi
Physics , 2009, DOI: 10.1088/0031-8949/81/01/015402
Abstract: The interaction of a weak probe laser with an inverted-Y type four-level atomic system driven by two additional coherent fields is investigated theoretically. Under the influence of the coherent coupling fields, the steady-state linear susceptibility of the probe laser shows that the system can have single or double electromagnetically induced transparency windows depending on the amplitude and the detuning of the coupling lasers. The corresponding index of refraction associated with the group velocity of the probe laser can be controlled at both transparency windows by the coupling fields. The propagation of the probe field can be switched from superluminal near the resonance to subluminal on resonance within the single transparency window when two coupling lasers are on resonance. This provides a potential application in quantum information processing. We propose an atomic $^{87}Rb$ system for experimental observation.
Control of spontaneous emission of an inverted Y-type atomic system coupled by three coherent fields
Jianbing Qi
Physics , 2009, DOI: 10.1103/PhysRevA.80.043827
Abstract: We investigate the spontaneous emission from an inverted Y-type atomic system coupled by three coherent fields. We use the Schr\"{o}dinger equation to calculate the probability amplitudes of the wave function of the system and derive an analytical expression of the spontaneous emission spectrum to trace the origin of the spectral features. Quantum interference effects, such as the spectral line narrowing, spectrum splitting and dark resonance are observed. The number of spectral components, the spectral linewidth, and relative heights can be very different depending on the physical parameters. A variety of spontaneous emission spectral features can be controlled by the amplitudes of the coupling fields and the preparation of the initial quantum state of the atom. We propose an ultracold atomic $^{87}Rb$ system for experimental observation.
Electromagnetically induced transparency and dark fluorescence in a cascade three-level Lithium molecule
Jianbing Qi,A. Marjatta Lyyra
Physics , 2005, DOI: 10.1103/PhysRevA.73.043810
Abstract: We observed electromagnetically induced transparency (EIT) and dark fluorescence in a cascade three-level diatomic Lithium system using Optical-Optical Double Resonance (OODR) spectroscopy. When a strong coupling laser couples the intermediate state $A^{1}\Sigma^{+}_{u}(v=13, J=14)$ to the upper state $G^{1}\Pi_{g}(v=11, J=14)$ of $^7Li_2$, the fluorescence from both $A^{1}\Sigma^{+}_{u}$ and $G^{1}\Pi_{g}$ states was drastically reduced as the weak probe laser was tuned through the resonance transition between the ground state $X^{1}\Sigma^{+}_{g}(v=4, J=15)$ and the excited state $A^{1}\Sigma^{+}_{u}(v=13, J=14)$. The strong coupling laser makes an optically thick medium transparent for the probe transition. In addition, The fact that fluorescence from the upper state $G^{1}\Pi_{g}(v=11, J=14)$ was also dark when both lasers were tuned at resonance implies that the molecules were trapped in the ground state. We used density matrix methods to simulate the response of an open molecular three-level system to the action of a strong coupling field and a weak probe field. The analytical solutions were obtained under the steady-state condition. We have incorporated the magnetic sublevel (M) degeneracy of the rotational levels in the lineshape analysis and report $|M|$ dependent lineshape splitting. The theoretical calculations are in excellent agreement with the observed fluorescence spectra. We show that the coherence is remarkably preserved even when the coupling field was detuned far from the resonance.
Study on the technology for highway construction and engineering practices in permafrost regions

ShuangJie Wang,JianBing Chen,JiLin Qi,

寒旱区科学 , 2009,
Abstract: In order to systemically summarize and integrate technology of highway construction in permafrost regions on the Qinghai-Tibet Plateau, we studied disciplines and mechanisms of formation and development of problems and challenges in highway engineering in high-altitude permafrost regions based on construction experiences for 50 years and on 30 years of research regarding the Qinghai-Tibet and Xikang highways. Embankments, pavements, bridges, and countermeasures for ecosystem protection in permafrost regions were the main study objects. We combined extensive analysis of key problems of engineering stability with interaction between permafrost and highways, theoretical models, indoor tests, and field tests to reveal the interaction between embankments, pavements, bridge piles, and permafrost. In this paper, we propose a series of engineering measures for highway stability, design parameters, key indexes for pavement durability in low temperature, relationships between re-freezing time of bridge-pile foundation and strength development as well as ecosystem recovery in high-latitude cold regions; these eventually form a construction technology package for permafrost regions.
Generalization of the Pecaric-Rajic Inequality in a Quasi-Banach Space  [PDF]
Jianbing Cao
Advances in Pure Mathematics (APM) , 2017, DOI: 10.4236/apm.2017.79031
Abstract: In the present paper, we shall give an extension of the well known Pecaric-Rajic inequality in a quasi-Banach space, we establish the generalized inequality for an arbitrary number of finitely many nonzero elements of a quasi-Banach space, and obtain the corresponding upper and lower bounds. As a result, we get some more general inequalities.
The SMW Formula for Bounded Homogeneous Generalized Inverses with Applications  [PDF]
Jianbing Cao
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.59143
Abstract: In this paper, we present an extension of the so-called classical Sherman-Morrison-Woodbury (for short SMW) formula for bounded homogeneous generalized inverse in Banach spaces. Some particular cases and applications will be also considered. Our results generalize the results of many authors for finite dimensional matrices and Hilbert space operators in the literature.
mRNA Differential Display of Tea Leavse under Polyethylene Glycol Stress
Guinian Qi,Jianbing Xia,Shengxiang Chen,Yingjuan Chen
Journal of Agricultural Science , 2010, DOI: 10.5539/jas.v2n4p186
Abstract: Tea (Camellia sinensis L.) is one of the world's three largest beverages which play an important role in agricultural production of China, India, Sri Lanka and other countries. Gene expression of two years old Fuding-dabaicha was analyzed using DDRT-PCR under PEG6000 stress. Through the analysis and screening of experimental conditions and primers combination, a number of different fragments were obtained. By submitting to GeneBank and BLAST comparison, we identified three different fragments while only one has pigment-related gene fragment.
Experimental Study on Vibration Control of Offshore Wind Turbines Using a Ball Vibration Absorber  [PDF]
Jie Li, Zili Zhang, Jianbing Chen
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.43021
Abstract: To minimize the excessive vibration and prolong the fatigue life of the offshore wind turbine systems, it is of value to control the vibration that is induced within the structure by implementing certain kinds of dampers. In this paper, a ball vibration absorber (BVA) is experimentally investigated through a series of shake table tests on a 1/13 scaled wind turbine model. The reductions in top displacement, top acceleration, bottom stress and platform stress of the wind turbine tower system subjected to earthquakes and equivalent wind-wave loads, respectively, with a ball absorber are examined. Cases of the tower with rotating blades are also investigated to validate the efficacy of this damper in mitigating the vibration of an operating wind turbine. The experimental results indicate that the dynamic performance of the tested wind turbine model with a ball absorber is significantly improved compared with that of the uncontrolled structure in terms of the peak response reduction.
Resistant Mechanism and Treatment Strategy of Tyrosine Kinase Inhibitors
Jianbing QIAO,Wenping CHEN
Chinese Journal of Lung Cancer , 2011, DOI: 10.3779/j.issn.1009-3419.2011.10.07
The Quasi-Linear Operator Outer Generalized Inverse with Prescribed Range and Kernel in Banach Spaces
Jianbing Cao,Yifeng Xue
Journal of Operators , 2013, DOI: 10.1155/2013/204587
Abstract: Let and be Banach spaces, and let be a bounded linear operator. In this paper, we first define and characterize the quasi-linear operator (resp., out) generalized inverse (resp., ) for the operator , where and are homogeneous subsets. Then, we further investigate the perturbation problems of the generalized inverses and . The results obtained in this paper extend some well-known results for linear operator generalized inverses with prescribed range and kernel. 1. Introduction and Preliminaries Let and be Banach spaces, let be a mapping, and let be a subset of . Recall from [1, 2] that a subset in is called to be homogeneous if for any and , we have . If for any and , we have , then we call as a homogeneous operator on , where is the domain of ; is called a bounded homogeneous operator if maps every bounded set in into bounded set in . Denote by the set of all bounded homogeneous operators from to . Equipped with the usual linear operations for , and for , the norm is defined by , and then similar to the space of all bounded linear operators from to , we can easily prove that is a Banach space (cf. [2, 3]). Throughout this paper, we denote by , , and the domain, the null space, and the range of a bounded homogeneous operator , respectively. Obviously, we have . For an operator , let and be closed subspaces of and , respectively. Recall that the out inverse with prescribed range and kernel is the unique operator satisfying . It is well known that the important kinds of generalized inverses, the Moore-Penrose inverse, the Drazin inverse, the group inverse, and so on, are all generalized inverse (cf. [4, 5]). Researches on the generalized inverse of operators or matrices have been actively ongoing for many years (see [5–12], e. g.). Let and let and be two homogeneous subsets in and , respectively. Motivated by related work on in the literature mentioned above and by our own recent research papers [13, 14], in this paper, we will establish the definition of the quasi-linear operator outer generalized inverse with prescribed range and kernel . We give the necessary and sufficient conditions for the existence of the generalized inverses , and we will also study the perturbation problems of the generalized inverse . Similar results on the generalized inverse are also given. 2. Definitions and Some Characterizations of and We first give the concepts of quasi-additivity and quasi-linear projectors in Banach spaces, which are important for us to present the main results in this paper. Definition 1. Let be a subset of and let be a mapping. Ones calls as
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