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Search Results: 1 - 10 of 36524 matches for " Bo Xin "
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Recent Results on Charm Semileptonic Decays
Bo Xin
Physics , 2009,
Abstract: We review the recent results on D and D_s meson semileptonic decays from CLEO-c, BABAR, and Belle. Comparisons with lattice quantum chromodynamics (LQCD) calculations and implications for B physics are also discussed.
Leptonic Charm Decays
Bo Xin
Physics , 2011,
Abstract: We review the recent experimental results on D and Ds meson leptonic decays from CLEO-c, Belle, and BABAR, which results in the decay constants f_D= (206.7 +- 8.9) MeV and f_Ds= (257.3 +- 5.3) MeV. The latter is an average obtained by the Heavy Flavor Averaging Group (HFAG). Comparisons with Lattice QCD (LQCD) calculations are discussed.
Charm Semileptonic Decays at CLEO-c
Bo Xin
Physics , 2011,
Abstract: We review the recent results on D and Ds meson semileptonic decays from CLEO-c. Comparisons with lattice quantum chromodynamics (LQCD) calculations and implications for B physics are also discussed.
Template-Free Bipotentiostatic Deposition of Thermoelectric BixTey Nano Arrays  [PDF]
Xin Bo, Feng Wang, Chuan Zhao
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.51001
Monodispersed Bi-Tenano arrays are achieved via template-free bipotentiostatic deposition. The diameter and length of individual nanorod is ~80 nm and ~250 nm respectively. The electrodeposition process is demonstrated to follow a two-step mechanism: an instantaneous reductive potential is applied to form dispersive nuclei, then a reverse oxidative potential strips partial Bi atoms to prevent further cross-growth. Repeatedly, the nano arrays film is obtained eventually. The thermoelectric properties of the obtained Bi-Tenano arrays such as electrical resistance, carrier density, Seebeck coefficient and power factor are measured to be 2.438 × 10-4?Ω·m, 4.251 × 1020 cm-3, -25.892 μV·K-1, 2.750 × 10-6 W·m-1·K2, respectively.
Functional inequalities on path space over a non-compact Riemannian manifold
Xin Chen,Bo Wu
Mathematics , 2013,
Abstract: We prove the existence of the O-U Dirichlet form and the damped O-U Dirichlet form on path space over a general non-compact Riemannian manifold which is complete and stochastically complete. We show a weighted log-Sobolev inequality for the O-U Dirichlet form and the (standard) log-Sobolev inequality for the damped O-U Dirichlet form. In particular, the Poincar\'e inequality (and the super Poincar\'e inequality) can be established for the O-U Dirichlet form on path space over a class of Riemannian manifolds with unbounded Ricci curvatures. Moreover, we construct a large class of quasi-regular local Dirichlet forms with unbounded random diffusion coefficients on the path space over a general non-compact manifold.
A New 3D Geometric Approach to Focus and Context Lens Effect Simulation
Bo Li,Xin Zhao
Computer Science , 2013,
Abstract: We present a novel methodology based on geometric approach to simulate magnification lens effects. Our aim is to promote new applications of powerful geometric modeling techniques in visual computing. Conventional image processing/visualization methods are computed in two dimensional space (2D). We examine this conventional 2D manipulation from a completely innovative perspective of 3D geometric processing. Compared with conventional optical lens design, 3D geometric method are much more capable of preserving shape features and minimizing distortion. We magnify an area of interest to better visualize the interior details, while keeping the rest of area without perceivable distortion. We flatten the mesh back into 2D space for viewing, and further applications in the screen space. In both steps, we devise an iterative deformation scheme to minimize distortion around both focus and context region, while avoiding the noncontinuous transition region between the focus and context areas. Particularly, our method allows the user to flexibly modify the ROI shapes to accommodate complex feature. The user can also easily specify a spectrum of metrics for different visual effects. Various experimental results demonstrate the effectiveness, robustness, and efficiency of our framework.
Pattern Recognition and Revealing using Parallel Coordinates Plot
Xin Zhao,Bo Li
Computer Science , 2013,
Abstract: Parallel coordinates plot (PCP) is an excellent tool for multivariate visualization and analysis, but it may fail to reveal inherent structures for datasets with a large number of items. In this paper, we propose a suite of novel clustering, dimension ordering and visualization techniques based on PCP, to reveal and highlight hidden structures. First, we propose a continuous spline based polycurves design to extract and classify different cluster aspects of the data. Then, we provide an efficient and optimal correlation based sorting technique to reorder coordinates, as a helpful visualization tool for data analysis. Various results generated by our framework visually represent much structure, trend and correlation information to guide the user, and improve the efficacy of analysis, especially for complex and noisy datasets.
Exploring Algorithmic Limits of Matrix Rank Minimization under Affine Constraints
Bo Xin,David Wipf
Computer Science , 2014,
Abstract: Many applications require recovering a matrix of minimal rank within an affine constraint set, with matrix completion a notable special case. Because the problem is NP-hard in general, it is common to replace the matrix rank with the nuclear norm, which acts as a convenient convex surrogate. While elegant theoretical conditions elucidate when this replacement is likely to be successful, they are highly restrictive and convex algorithms fail when the ambient rank is too high or when the constraint set is poorly structured. Non-convex alternatives fare somewhat better when carefully tuned; however, convergence to locally optimal solutions remains a continuing source of failure. Against this backdrop we derive a deceptively simple and parameter-free probabilistic PCA-like algorithm that is capable, over a wide battery of empirical tests, of successful recovery even at the theoretical limit where the number of measurements equal the degrees of freedom in the unknown low-rank matrix. Somewhat surprisingly, this is possible even when the affine constraint set is highly ill-conditioned. While proving general recovery guarantees remains evasive for non-convex algorithms, Bayesian-inspired or otherwise, we nonetheless show conditions whereby the underlying cost function has a unique stationary point located at the global optimum; no existing cost function we are aware of satisfies this same property. We conclude with a simple computer vision application involving image rectification and a standard collaborative filtering benchmark.
Collision Characteristics between Ultracold Cesium nP Rydberg Atoms  [PDF]
Zhigang Feng, Xin Zhou, Bo Li, Hongying Gao, Zheng Liu
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.95053
Abstract: We investigate the effect of van der Waals interactions and dipole-dipole interactions on collisional loss rate coefficients of Cs Rydberg nP states, and in detail analyze the variation of collisional loss coefficients under the initial Rydberg atomic velocity and van der Waals interactions. We obtain the total collisional loss coefficients for different nP states, and provide the possible ionization mechanism for the results of experimental observation using our analysis model.
Comparison of Laparoscopy-Assisted Gastrectomy and Conventional Open Gastrectomy with the Same Procedure in Early Distal Gastric Cancer  [PDF]
Li-Bo Sun, Zhen-Bo Shu, Yun-Xin Zhang, Da-Yong Ding, Yong-Chao Li
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.41A001
Abstract: Introduction: Laparoscopy-assisted gastrectomy (LAG) for early gastric cancer (EGC) was considered as a treatment with many advantages due to the application of laparoscopic equipment. The aim of this study was to compare the effect of use of laparoscopic equipment in blood loss, the number of harvested lymph nodes (HLNs), and complications between LAG and open gastrectomy (OG) for EGC. Methods: Patients received surgical treatment for early distal gastric cancer (EDGC) were retrospectively reviewed. Patients were classified into three groups by different operation methods: traditional open distal gastrectomy (ODG) group, laparoscopy-assisted distal gastrectomy (LADG) group, and open distal gastrectomy with assistance of laparoscopic equipment (ODGA) group. Results: Altogether 65 patients with EDGC received surgical treatment, including 20 cases of ODG, 22 of LADG, and 23 of ODGA. No lymph node metastasis was found in all patients. 25 (38.5%) postoperative confirmed T2 were misdiagnosed as T1 preoperatively. Compared with ODG group, the blood loss was significantly reduced in LADG and ODGA groups (106.4 ± 46.0; and 73.3 ± 35.7 ml vs. 250.5 ± 65.1 ml respectively; P < 0.01), but the operation time was significantly longer in these groups (231.0 ± 34.5, and 222.5 ± 42.6 min vs. 128.5 ± 22.3 min respectively; P < 0.01). No difference was found in the blood loss, operation time, the number of harvested lymph nodes and the types of gastrointestinal continuity reconstruction between LADG and ODGA groups. No difference was found in the postoperative complications among the three groups. Conclusions: Laparoscopic equipment might be the key factor in the reduction of blood loss and the delay of operation time for LADG. Application of laparoscopic equipment in open gastrectomy can be used as a training method to shorten learning curve for LAG beginners.

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