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Search Results: 1 - 10 of 167116 matches for " Y. Wang "
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Analysis for Pull-In Voltage of a Multilayered Micro-Bridge Driven by Electrostatic Force  [PDF]
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.21007
Abstract: A trial solution for bending deflection of a multilayered micro-bridge subject to a voltage induced load is presented. The relation between the applied voltage and the displacements of the micro-bridge in the pull-in state is analyzed by energy method. Furthermore, two analytical expressions about normalized displacement and pull-in voltage are carried out. It’s proved that the value of normalized displacement is not influenced by residual stress if axial and shear deformation is ignored. Finally, the theoretical results are compared with that of FEM, and they show good agreement.
THz Oscillations in a GaN Based Planar Nano-Device  [PDF]
K. Y. Xu, Y. N. Wang, Z. N. Wang, J. W. Xiong, G. Wang
Journal of Computer and Communications (JCC) , 2013, DOI: 10.4236/jcc.2013.17012

Gunn oscillations in a GaN based planar nano-device have been studied by ensemble Monte Carlo (EMC) method. Simulation results show that when the channel length of the device reduces to 450 nm, THz oscillations (about 0.3 THz) can be obtained. Also the phase of the oscillations can be controlled by the initial conditions that excite the Gunn domains. Moreover, through adjusting the phase difference between the oscillations in a double-channels device, which attained by parallel connecting two single-channel devices, the frequency of the device shifts from 0.3 THz to 0.6 THz. This phenomenon remains in devices with shorter channel-length, unless the channel-length is too short to support Gunn oscillations. The possible underlying mechanisms are also discussed.

Hierarchical Production of Privacy: Gating in Compact Living in Hong Kong  [PDF]
Jun Wang, Stephen S. Y. Lau
Current Urban Studies (CUS) , 2013, DOI: 10.4236/cus.2013.12002
Abstract: Measured by both the physically fortified character and socio-legal systems of service delivery and governance, the number of neighborhoods in Hong Kong that falls into the category of gated community is huge. Gating here is widely employed in various types of housing estates, from luxury developments for the affluent, to aged tenement houses that usually house the less advantaged group, and even to public housing for the population segment who are at the very bottom of the social strata. In the densely populated Hong Kong, privacy is a rare urban resource, the competition for which thus leads to valorization of buffer between public and private lives in a hierarchical way. Gating, in its various forms and correspondingly varying magnificence to which one’s privacy is protected and separated from the public, then serves as the marker of social differences. This paper attempts to investigate the hierarchy in three tiers, with a focus on Tier Three, where vertical gating is invented as another dimension to mark social differences in the composite development model.
Crucial experiment to resolve Abraham-Minkowski Controversy
Z. Y. Wang,P. Y. Wang,Y. R. Xu
Physics , 2011, DOI: 10.1016/j.ijleo.2010.12.018
Abstract: Abraham-Minkowski dilemma concerning the momentum of light within dielectric materials has persisted over 100 years[1]-[2] and conflicting experiments were reported until recently[3]-[4]. We perform a reversed Fizeau experiment to test the composition law of light speeds in media and the result accords with extended Lorentz transformations where the light speed c is changed to c/n. This is a crucial evidence that Minkowski's formulation p=nE/c should be correct although the momentum is not measured directly. By the way, the energy velocity of an electromagnetic field transferred along good conductors may be much faster than c and people have broken the light barrier for a very long time.
Percutaneous Iliac Screws for Minimally Invasive Spinal Deformity Surgery
Michael Y. Wang
Minimally Invasive Surgery , 2012, DOI: 10.1155/2012/173685
Abstract: Introduction. Adult spinal deformity (ASD) surgeries carry significant morbidity, and this has led many surgeons to apply minimally invasive surgery (MIS) techniques to reduce the blood loss, infections, and other peri-operative complications. A spectrum of techniques for MIS correction of ASD has thus evolved, most recently the application of percutaneous iliac screws. Methods. Over an 18 months 10 patients with thoracolumbar scoliosis underwent MIS surgery. The mean age was 73 years (70% females). Patients were treated with multi-level facet osteotomies and interbody fusion using expandable cages followed by percutaneous screw fixation. Percutaneous iliac screws were placed bilaterally using the obturator outlet view to target the ischial body. Results. All patients were successfully instrumented without conversion to an open technique. Mean operative time was 302 minutes and the mean blood loss was 480?cc, with no intraoperative complications. A total of 20 screws were placed successfully as judged by CT scanning to confirm no bony violations. Complications included: two asymptomatic medial breaches at T10 and L5, and one patient requiring delayed epidural hematoma evacuation. Conclusions. Percutaneous iliac screws can be placed safely in patients with ASD. This MIS technique allows for successful caudal anchoring to stress-shield the sacrum and L5-S1 fusion site in long-segment constructs. 1. Introduction Surgery to correct adult spinal deformity (ASD) is a growing field. The ever-aging American population is presenting to spinal surgeons increasingly with high expectations of continued quality of life well into the seventh, eighth, and ninth decades of life. However, while surgical treatment of ASD is the only viable option for patients failing conservative measures, the surgical interventions are associated with relatively high morbidity and mortality rates. Indeed, in a series reported from Johns’ Hopkins consisting of 361 patients, the 30-day mortality rate was found to be 2.4% [1]. In a more series by Smith et al., multicenter data from the Spinal Deformity Study Group demonstrated that even in expert centers 26.2% of patients suffered a minor complication and 15.5% suffered a major complication [2]. Several factors contribute to these high complication rates, including reduced bone mass and weaker fixation points, a higher associated rate of medical comorbidites, patient deconditioning due to immobility, and a rigid and nonflexible deformity [3, 4]. In addition, the surgical enterprise necessary to correct ASD is typically a long-segment
Reply to Comments to X. Li and Y. M. Wang (2011) Comparisons of geoid models over Alaska computed with different Stokes' kernel modifications, JGS 1(2): 136-142 by L. E. Sj berg
Y. M. Wang
Journal of Geodetic Science , 2012, DOI: 10.2478/v10156-011-0023-x
Abstract: The authors thank professor Sj berg for having interest in our paper. The main goal of the paper is to test kernel modification methods used in geoid computations. Our tests found that Vanicek/Kleusberg's and Featherstone's methods fit the GPS/leveling data the best in the relative sense at various cap sizes. At the same time, we also pointed out that their methods are unstable and the mean values change from dm to meters by just changing the cap size. By contrast, the modification of the Wong and Gore type (including the spectral combination, method of Heck and Grüninger) is stable and insensitive to the truncation degree and cap size. This feature is especially useful when we know the accuracy of the gravity field at different frequency bands. For instance, it is advisable to truncate Stokes' kernel at a degree to which the satellite model is believed to be more accurate than surface data. The method of the Wong and Goretype does this job quite well. In contrast, the low degrees of Stokes' kernel are modified by Molodensky's coefficients tn in Vanicek/Kleusberg's and Featherstone's methods (cf. Eq. (6) in Li and Wang (2011)). It implies that the low degree gravity field of the reference model will be altered by less accurate surface data in the final geoid. This is also the cause of the larger variation in mean values of the geoid.
Progress on chiral symmetry breaking in a strong magnetic field
Wang, S. -Y.
High Energy Physics - Phenomenology , 2007,
Abstract: The problem of chiral symmetry breaking in QED in a strong magnetic field is briefly reviewed. Recent progress on issues regarding the gauge fixing independence of the dynamically generated fermion mass is discussed.
Dynamical Electron Mass in a Strong Magnetic Field
Wang, S. -Y.
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.77.025031
Abstract: Motivated by recent interest in understanding properties of strongly magnetized matter, we study the dynamical electron mass generated through approximate chiral symmetry breaking in QED in a strong magnetic field. We reliably calculate the dynamical electron mass by numerically solving the nonperturbative Schwinger-Dyson equations in a consistent truncation within the lowest Landau level approximation. It is shown that the generation of dynamical electron mass in a strong magnetic field is significantly enhanced by the perturbative electron mass that explicitly breaks chiral symmetry in the absence of a magnetic field.
Comment on "Modified Coulomb Law in a Strongly Magnetized Vacuum"
Wang, S. -Y.
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevLett.99.228901
Abstract: This is a comment on Phys. Rev. Lett. 98, 180403 (2007) [].
Object Extraction from Architecture Scenes through 3D Local Scanned Data Analysis
Advances in Electrical and Computer Engineering , 2012, DOI: 10.4316/aece.2012.03011
Abstract: Terrestrial laser scanning becomes a standard way for acquiring 3D data of complex outdoor objects. The processing of huge number of points and recognition of different objects inside become a new challenge, especially in the case where objects are included. In this paper, a new approach is proposed to classify objects through an analysis on shape information of the point cloud data. The scanned scene is constructed using k Nearest Neighboring (k-NN), and then similarity measurement between points is defined to cluster points with similar primitive shapes. Moreover, we introduce a combined geometrical criterion to refine the over-segmented results. To achieve more detail information, a residual based segmentation is adopted to refine the segmentation of architectural objects into more parts with different shape properties. Experimental results demonstrate that this approach can be used as a robust way to extract different objects in the scenes.
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