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Search Results: 1 - 10 of 34960 matches for " Weiping Lu "
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Link Prediction Based on Local Random Walk
Weiping Liu,Linyuan Lu
Physics , 2010, DOI: 10.1209/0295-5075/89/58007
Abstract: The problem of missing link prediction in complex networks has attracted much attention recently. Two difficulties in link prediction are the sparsity and huge size of the target networks. Therefore, the design of an efficient and effective method is of both theoretical interests and practical significance. In this Letter, we proposed a method based on local random walk, which can give competitively good prediction or even better prediction than other random-walk-based methods while has a lower computational complexity.
Cavity-induced phase stability to decelerate a fast molecular beam via feedback-controlled time-varying optical pumps
Zhihao Lan,Weiping Lu
Physics , 2014, DOI: 10.1088/1367-2630/13/2/023031
Abstract: We have identified a novel phase stability mechanism from the intracavity field-induced self-organization of a fast-moving molecular beam into travelling molecular packets in the bad cavity regime, which is then used to decelerate the molecular packets by feedback-controlled time-varying laser pumps to the cavity. We first applied the linear stability analysis to derive an expression for this self-organization in the adiabatic limit and show that the self-organization of the beam leads to the formation of travelling molecular packets, which in turn function as a dynamic Bragg grating, thus modulating periodically the intracavity field by superradiant scattering of the pump photons. The modulation encodes the position information of the molecular packets into the output of the intracavity field instantaneously. We then applied time-varying laser pumps that are automatically switched by the output of the intracavity field to slow down the molecular packets via a feedback mechanism and found that most of the molecules in the molecular packets are decelerated to zero central velocity after tens of stages. Our cavity-based deceleration proposal works well in the bad cavity regime, which is very different from the conventional cavity- based cooling strategies where a good cavity is preferred. Practical issues in realizing the proposal are also discussed.
Information filtering via preferential diffusion
Linyuan Lu,Weiping Liu
Computer Science , 2011, DOI: 10.1103/PhysRevE.83.066119
Abstract: Recommender systems have shown great potential to address information overload problem, namely to help users in finding interesting and relevant objects within a huge information space. Some physical dynamics, including heat conduction process and mass or energy diffusion on networks, have recently found applications in personalized recommendation. Most of the previous studies focus overwhelmingly on recommendation accuracy as the only important factor, while overlook the significance of diversity and novelty which indeed provide the vitality of the system. In this paper, we propose a recommendation algorithm based on the preferential diffusion process on user-object bipartite network. Numerical analyses on two benchmark datasets, MovieLens and Netflix, indicate that our method outperforms the state-of-the-art methods. Specifically, it can not only provide more accurate recommendations, but also generate more diverse and novel recommendations by accurately recommending unpopular objects.

Lu Weiping,

现代图书情报技术 , 1994,
Abstract: In this paper,the concepts and properties of E-mail including the commands and usage are described.The impact of E-mail on libraries is explored as well.
Anderson Localization of cold atomic gases with effective spin-orbit interaction in a quasiperiodic optical lattice
Lu Zhou,Han Pu,Weiping Zhang
Physics , 2013, DOI: 10.1103/PhysRevA.87.023625
Abstract: We theoretically investigate the localization properties of a spin-orbit coupled spin-1/2 particle moving in a one-dimensional quasiperiodic potential, which can be experimentally implemented using cold atoms trapped in a quasiperiodic optical lattice potential and external laser fields. We present the phase diagram in the parameter space of the disorder strength and those related to the spin-orbit coupling. The phase diagram is verified via multifractal analysis of the atomic wavefunctions and the numerical simulation of diffusion dynamics. We found that spin-orbit coupling can lead to the spectra mixing (coexistence of extended and localized states) and the appearance of mobility edges.
Quantum phases of strongly interacting Rydberg atoms in triangular lattices
Jing Qian,Lu Zhou,Weiping Zhang
Physics , 2013, DOI: 10.1103/PhysRevA.87.063421
Abstract: We present a theoretical study on the system of laser-driven strongly interacting Rydberg atoms trapped in a two-dimensional triangular lattice, in which the dipole-dipole interactions between Rydberg states result in exotic quantum phases. By using the mean-field theory, we investigate the steady state solutions and analyze their dynamical stabilities. We find that in the strong-interaction limit, the dynamics of the system is chaotic and exhibits random oscillations under appropriate laser detunings. Lyapunov exponent criterion is introduced to confirm the existence of this chaotic behavior. In addition, we present a full quantum calculation based on a six-atom model, and find that the system exhibits some bi-antiferromagnetic properties in every triangular cell when the one-photon detuning is exactly resonant or blue-shifted.
Sensitive HPV Genotyping Based on the Flow-Through Hybridization and Gene Chip
Pingping Tao,Weiping Zheng,Yungen Wang,Mei-lu Bian
Journal of Biomedicine and Biotechnology , 2012, DOI: 10.1155/2012/938780
Abstract: Persistent infection of high-risk human papillomavirus (HPV) has been recognized as the direct cause of cervical carcinoma. Therefore, detection and genotyping of HPV are important to cervical-cancer screening. In this study, we have evaluated the efficacy of flow-through hybridization and gene chip (HybriMax) on HPV genotyping through comparison of the results with Hybrid Capture II (HC-II) and in situ hybridization (ISH). 591 women were classified into 6 groups according to their histological diagnoses. The overall accordance rate on 13 types of HPV genotypes between HybriMax and HC-II were 92.5% and 100% in the cancer group. The overall accordance was excellent with the Kappa index (KI) of 0.814. The value of KI in each group was 0.750 (normal cytological diagnosis), 0.781 (chronic cervicitis), 0.80 (condyloma acuminatum), 0.755 (cervical intraepithelial neoplasia (CIN) I), 0.723 (CIN II), and 0.547 (CIN III) (, good; , excellent). The 10 most common HPV subtype detected by HybriMax were 16, 52/58, 18, 33, 31, 81, 53, 68, and 66 in patients, and 16, 68, 18, 52, 58, 11, 53, 31/39, and 33 in normal controls. In conclusion, HybriMax is an efficient method for HPV genotyping and more suitable for clinical use.
Serum A-FABP Is Increased and Closely Associated with Elevated NT-proBNP Levels in Type 2 Diabetic Patients Treated with Rosiglitazone
Mi Zhou, Yuqian Bao, Junxi Lu, Jian Zhou, Weiping Jia
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027032
Abstract: Background Adipocyte fatty acid-binding protein (A-FABP) has been shown to play important roles in the development of metabolic syndrome, diabetes, and cardiovascular diseases. In this study we investigated the possible role of A-FABP in the development of cardiac dysfunction related to rosiglitazone treatment. Methodology/Principal Findings A total of 84 patients with newly diagnosed type 2 diabetes were treated with rosiglitazone for 48 weeks. Circulating A-FABP and N-terminal pro-brain natriuretic peptide (NT-proBNP) levels were determined at baseline and repeated at 24 and 48 weeks. After the 48-week rosiglitazone treatment period, serum levels of both A-FABP and NT-proBNP increased progressively and significantly (P<0.01). Serum levels of A-FABP were demonstrated to be positively correlated with gender and waist circumference both at baseline and the end of the study, and with age, body mass index (BMI), total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C), and NT-proBNP at 48 weeks (all P<0.05). In addition, changes in A-FABP were significantly and positively correlated with changes in NT-proBNP (r = 0.239, P = 0.039). Furthermore, multiple stepwise regression analysis showed that the changes in A-FABP were independently and positively associated with changes in NT-proBNP after adjusting for confounding factors (β = 0.320, P = 0.007). Conclusions/Significance Rosiglitazone-mediated increase of A-FABP is closely associated with the elevation of NT-proBNP, a well-established marker of cardiac dysfunction. The findings of our study imply that A-FABP may mediate the cross-talk between heart and adipose tissue.
Optimization of β-carotene production by a newly isolated Serratia marcescens strain
Wang,Bohua; Lin,Liping; Lu,Lei; Chen,Weiping;
Electronic Journal of Biotechnology , 2012, DOI: 10.2225/vol15-issue6-fulltext-4
Abstract: β-carotene is a commonly used food colorant. in this work, a novel β-carotene producing strain, serratia marcescens rb3, was isolated and identified by physiological and biochemical tests, as well as 16s rdna sequence analysis. the production of β-carotene by s. marcescens rb3 was identified through hplc analysis. the cultivation conditions for β-carotene production by s. marcescens rb3 were optimized as 2.0% lactose, 2.0% peptone, 0.3% beef extract, 1.0% nacl supplemented with 0.05% fe2+, ph 6.0 and 30oc. under the optimal conditions, the yield of β-carotene achieved 2.45 μg/ml.
Phase field simulation of interatomic potentials for double phase competition during early stage precipitation
WeiPing Dong,YongXin Wang,Kun Yang,Zheng Chen,YanLi Lu
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4407-1
Abstract: Phase field model was employed to study the variations of interatomic potentials of Ni3Al (L12 phase) and Ni3V (DO22 phase) as a function of temperature and concentration. The long-range order (LRO) parameter related interatomic potentials equations formulated by Khachaturyan were utilized to establish the inversion equations for L12 and DO22 phases, with which interatomic potentials could be calculated. The interatomic potentials of Ni-Al and Ni-V exhibited approximately linear increases and decreases, individually, with enhanced Al concentration. Substituting the inverted interatomic potentials into the microscopic phase field equations led to three cases of precipitation sequence: the DO22 phase preceded L12 phase precipitating at the interatomic potentials of Ni-V > Ni-Al; the vice cases; and two phases precipitated simultaneously at interatomic potentials of Ni-V and Ni-Al were equal.
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