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Search Results: 1 - 10 of 129667 matches for " ZHANG Ying-jie "
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Entanglement Sudden Death in Band Gaps
Ying-Jie Zhang
Physics , 2009, DOI: 10.1140/epjd/e2010-00087-6
Abstract: Using the pseudomode method, we evaluate exactly time-dependent entanglement for two independent qubits, each coupled to a non-Markovian structured environment. Our results suggest a possible way to control entanglement sudden death by modifying the qubit-pseudomode detuning and the spectrum of the reservoirs. Particularly, in environments structured by a model of a density-of-states gap which has two poles, entanglement trapping and prevention of entanglement sudden death occur in the weak-coupling regime.
Microwave Hydrothermal Synthesis of Hexagonal NaYF4 and Yb3+,Er3+-doped NaYF4 Microtubes
ZHANG Ling,ZHU Ying-Jie
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.00553
Abstract: NaYF4 and Yb3+,Er3+a2doped NaYF4 (NaYF4 b3+,Er3+) microtubes with a hexagonal structure were prepared by a simple microwave hydrothermal method at a relatively low temperature in a short period of time without using toxic trifluoroacetic acid. The starting reagents used in the preparation are Y(NO3)3 (also using Yb(NO3)3 and Er(NO3)3 in the case of doping), NaF, citric acid, NaOH and ethyl acetate, and deionized water is used as the solvent. The asa2prepared samples were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The effects of experimental parameters on the morphology and the crystal phase of the product were investigated. And the upa2conversion photoluminescence properties of the NaYF4 b3+,Er3+ microtubes were investigated. NaYF4 microtubes with single hexagonal phase are obtained by microwave heating method at a lower temperature in a short period. The formation mechanism of NaYF4 b3+,Er3+ microtubes is proposed. The prepared NaYF4 b3+,Er3+ microtubes have high luminescence intensity.
Level Set Methods and Its Application on Image Segmentation

QIAN Yun,ZHANG Ying-jie,QIAN Yun,ZHANG Ying-jie,

中国图象图形学报 , 2008,
Abstract: Image segmentation is a key problem in image processing. Curve evolution, which is very difficult to solve previously,was effectively handled by level set method proposed by Osher and Sethian. At present, there are so many image segmentation methods based on level set, and there are different methods to different images. Now, these methods are continually improved to enhance the speed and the veracity. So in this paper, according to the development of the image segmentation methods based on level set, this algorithm is introduced for readers of different backgrounds in this field to use.
Generation of multipartite entangled states by cavity QED

Zhang Ying-Jie,Ren Ting-Qi,Xia Yun-Jie,

中国物理 B , 2008,
Abstract: We propose the methods of generating multipartite entanglement by considering the interaction of a system of $N$ two-level atoms in $M$ cavities of high quality factor with a strong classical driving field. It is shown that, with the cavity detuning, the applied driving field detuning and vacuum Rabi coupling, we can produce an entangled coherent state in two single-mode cavities and generate the entangled coherent cluster states in two bimodal vacuum cavities. Tuning these parameters also allows us to acquire the anti-Jaynes--Cummings (AJC) interaction, with which we can generate the maximally two-photon entangled states, and the two-atom and the two-photon entangled cluster states.
Atomic entanglement sudden death in a strongly driven cavity QED system
Ying-Jie Zhang,Zhong-Xiao Man,Yun-Jie Xia
Physics , 2008, DOI: 10.1088/0953-4075/42/9/095503
Abstract: We study the entanglement dynamics of strongly driven atoms off-resonantly coupled with cavity fields. We consider conditions characterized not only by the atom-field coupling but also by the atom-field detuning. By studying two different models within the framework of cavity QED, we show that the so-called atomic entanglement sudden death (ESD) always occurs if the atom-field coupling lager than the atom-field detuning, and is independent of the type of initial atomic state.
Quantum discord dynamical behaviors due to initial system-cavity correlations
Ying-Jie Zhang,Xu-Bo Zou,Yun-Jie Xia
Physics , 2010, DOI: 10.1088/0953-4075/44/3/035503
Abstract: We analyze the roles of initial correlations between the two-qubit system and a dissipative cavity on quantum discord dynamics of two qubits. Considering two initial system-cavity states, we show that the initial system-cavity correlations not only can initially increase the two-qubit quantum discord but also would lead to a larger long-time quantum discord asymptotic value. Moreover, quantum discord due to initial correlations is more robust than the case of the initial factorized state. Finally, we show the initial correlations' importance for dynamics behaviors of mutual information and classical correlation.
Microwave Hydrothermal Synthesis of Hexagonal NaYF4 and Yb3+,Er3+-doped NaYF4 Microtubes

ZHANG Ling,ZHU Ying-Jie,
张 凌

无机材料学报 , 2009,
Abstract: 为了合成单相以及Yb3+、 Er3+掺杂的六方结构NaYF4,采用微波水热的方法,以稀土硝酸盐、氟化钠、柠檬酸、氢氧化钠、乙酸乙酯和水为原料,合成了六方相NaYF4以及Yb3+、Er3+掺杂的六方相NaYF4 (NaYF4∶Yb3+,Er3+)微米管. 利用XRD、SEM对所得样品的物相和形貌进行了表征. 研究了不同反应条件对产物形貌和物相的影响,并提出了NaYF4微米管的形成机理. 研究发现,采用微波加热的方法可以在较低的温度下快速得到单一六方相的NaYF4. 所制备的Yb3+、 Er3+掺杂NaYF4微米管的上转换发光性能与其体材料类似,具有较高的发光强度.
Biodata as A Personnel Recruitment Selection Approach in China:Assessment and Its Validity

YAN Jin,WU Ying-Jie,ZHANG Wei,

心理学报 , 2010,
Abstract: In this study,we examined the validity and reliability of a domestically-derived biodata assessment tool targeted to recruitment in China.The use of biodata provides an important and key assessment method in personnel assessment and selection.It focuses on an individual's personal history.One's past behaviors are critical predictors in predicting individual's future behaviors.Consequently,biodata uses facts from an individual's past to predict future working behaviors.Despite of the promise of biodata as an assessment tool,its validity and reliability within China has been limited.In the assessment and selection of government officials in China,biodata methods are mainly used during the first step of screening potential candidates.During the early stages of screening,it will lead to subjective and unstable results without defining proper criteria.In universities in China,millions of resumes were received during annual campus recruitment require processing.An implementation of biodata resume filtering is the primary choice in determining the first pool of applicants' competency level.Biodata methods also have a long history of effectively coordinating personnel assessment.However,the usage of biodata tools derrived from outside of China have not been valid or reliable for personnel recruitment within China.In order to promote accuracy during the utilization of biodata information in making proper decisions,this study developed a biodata assessment tool for use in China's campus recruitment.We developed an application form using a standardized coding tool to measure biodata information.During implementation we first developed biodata assessment tools,selecting 250 applicants' data consisting of an individual's cognitive ability,personality,biodata and interviewing ability.Secondly,we coded the application forms with a standardized coding tool.In the semi-structured application form,the biodata information,such as academic records,computer skills,rewards and social experiences,were used by a score scaling method.We then statistically tested the validity with a verification method which is seeking the relationship between biodata and other assessment tools.After the logarithmic transformation of the scaling data and the reliability analysis was completed,a validity analysis was conducted from the biodata,cognitive ability,personality and the interview results.The results revealed that the relationship was congruent with previous research results verifying the validity and incremental value of biodata.It explained reliable variance of personnel recruitment decsions.The statistical result showed that the validity of our domestically-derived biodata tools in prediction was effective,and,in turn,revealed that biodata can be an effective tool for personnel assessment.We also determined that biodata would account for distinct incremental variance in the selection result in comparison with the variance contributed by GMA or FFM personality data.We then conc
A possible NN*(1440) quasi-molecular state
Zhao, Lu;Shen, Peng-Nian;Zhang, Ying-Jie;Zou, Bing-Song
High Energy Physics - Phenomenology , 2013,
Abstract: Inspired by the recent observation of a narrow resonance-like structure around 2360 MeV in the p+n to d + \pi 0 + \pi 0 cross section, the possibility of forming a NN*(1440) quasi-molecular state is investigated by using a meson exchange model in which the \pi, \sigma, \rho\ and \omega\ exchanges in t- and u-channels are considered. By adopting the coupling constants extracted from the relevant NN scattering and N*(1440) decay data, it is found that a deuteron-like quasi-molecular state of NN*(1440) with a binding energy in the range of from 2 to 67MeV can be formed. Therefore, it is speculated that the observed structure around 2360 MeV might be or may have a large component of the NN*(1440) quasi-molecular state.
Europium-doped amorphous calcium phosphate porous nanospheres: preparation and application as luminescent drug carriers
Chen Feng,Zhu Ying-Jie,Zhang Kui-Hua,Wu Jin
Nanoscale Research Letters , 2011,
Abstract: Calcium phosphate is the most important inorganic constituent of biological tissues, and synthetic calcium phosphate has been widely used as biomaterials. In this study, a facile method has been developed for the fabrication of amorphous calcium phosphate (ACP)/polylactide-block-monomethoxy(polyethyleneglycol) hybrid nanoparticles and ACP porous nanospheres. Europium-doping is performed to enable photoluminescence (PL) function of ACP porous nanospheres. A high specific surface area of the europium-doped ACP (Eu3+:ACP) porous nanospheres is achieved (126.7 m2/g). PL properties of Eu3+:ACP porous nanospheres are investigated, and the most intense peak at 612 nm is observed at 5 mol% Eu3+ doping. In vitro cytotoxicity experiments indicate that the as-prepared Eu3+:ACP porous nanospheres are biocompatible. In vitro drug release experiments indicate that the ibuprofen-loaded Eu3+:ACP porous nanospheres show a slow and sustained drug release in simulated body fluid. We have found that the cumulative amount of released drug has a linear relationship with the natural logarithm of release time (ln(t)). The Eu3+:ACP porous nanospheres are bioactive, and can transform to hydroxyapatite during drug release. The PL properties of drug-loaded nanocarriers before and after drug release are also investigated.
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