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Search Results: 1 - 10 of 158036 matches for " Yi-Ming Wang "
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The Temperature-Dependent Nature of Coronal Dimmings
Eva Robbrecht,Yi-Ming Wang
Physics , 2010, DOI: 10.1088/2041-8205/720/1/L88
Abstract: The opening-up of the magnetic field during solar eruptive events is often accompanied by a dimming of the local coronal emission. From observations of filament eruptions recorded with the Extreme-Ultraviolet Imager on STEREO during 2008-2009, it is evident that these dimmings are much more pronounced in 19.5 nm than in the lower-temperature line 17.1 nm, as viewed either on the disk or above the limb. We conclude that most of the cooler coronal plasma is not ejected but remains gravitationally bound when the loops open up. This result is consistent with Doppler measurements by Imada and coworkers, who found that the upflow speeds in a transient coronal hole increased dramatically above a temperature of 1 MK; it is also consistent with the quasistatic behavior of polar plumes, as compared with the hotter interplume regions that are the main source of the fast solar wind. When the open flux reconnects and closes down again, the trapped plasma is initially heated to such high temperatures that it is no longer visible at Fe IX 17.1 nm. Correspondingly, 17.1 nm images show a dark ribbon or ``heat wave'' propagating away from the polarity inversion line and coinciding with the brightened Fe XV 28.4 nm and Fe XII 19.5 nm post-eruptive loops and their footpoint areas. Such dark ribbons provide a clear example of dimmings that are not caused by a density depletion. The propagation of the ``heat wave'' is driven by the closing-down, not the opening-up, of flux and can be observed both off-limb and on-disk.
Recent advances in fiber-optic DNA biosensors  [PDF]
Yi-Ming Wang, Xiao-Feng Pang, Yu-Yu Zhang
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.25046
Abstract: Fiber-optic DNA biosensors are a kind of ana-lytic setups, which convert the Waston-Crick base pairs matching duplex or Hoogsteen’s tri-plex (T/A-T, C/G-C) formation into a readable analytical signals when functionalized single- strands DNA (ssDNA) or double-strands DNA (dsDNA) of interest are immobilized on the sur-face of fiber-optic hybrids with target DNA or interacts with ligands. This review will provide the information about the fiber-optic DNA bio-sensors classified into two categories depend-ing on the end fiber and side fiber with or with-out the labels—label-free fiber-optic DNA bio-sensors and labeled fiber-optic DNA biosensor in recent years. Both are dissertated, and em-phasis is on the label-free fiber-optic DNA bio-sensors. Fiber-optic DNA biosensors had got great progresses because fiber-optic has more advantages over the other transducers and are easily processed by nanotechnology. So fiber- optic DNA biosensors have increasingly at-tracted more attention to research and develop the new fiber-optic DNA biosensors that inte-grated with the “nano-bio-info” technology for in vivo test, single molecular detection and on-line medical diagnosis. Finally, future pros-pects to the fiber-optic DNA biosensors are predicted.
Electromagnetic Band Gap Loaded Square Waveguide Band-Pass Filter for Dual-Polarized Application  [PDF]
Yi-Ming Tang
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.34030
Abstract: An Electromagnetic Band Gap (EBG) loaded square waveguide Band-Pass Filter (BPF) is proposed in this paper. It’s simply composed by symmetrically loading periodical metal diaphragms on each wall of a square waveguide. The influences of insert sizes and loading periods on the overall BPF performances are analyzed. Experimental results agree well with those predicted. 6 GHz pass-band with insert loss less than 1 dB, 2.5 GHz stop-band and larger than 25 dB polarization isolation can be obtained. The BPF can be applied in dual-polarized waveguide-based antenna-feed systems.
Research and implementation of denoising algorithm for low-Illumination image

PENG Bo,WANG Yi-ming,

计算机应用 , 2007,
Abstract: This paper analyzed the main noise sources for Low-Illumination Image. And a denoising method, combining Mathematics morphology with Median filter, was designed after balancing image smoothness, clearness and time complexity through the experiments of common denoising algorithms. The experiments also confirm that the algorithm is feasible, real-time and robust.
Synthesis of Nanosized Zinc-Doped Cobalt Oxyhydroxide Parties by a Dropping Method and Their Carbon Monoxide Gas Sensing Properties
Jian-Wen Wang,Yi-Ming Kuo
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/136145
Coronal Pseudo-Streamer and Bipolar Streamer Observed by SOHO/UVCS in March 2008
Lucia Abbo,Roberto Lionello,Pete Riley,Yi-Ming Wang
Physics , 2015, DOI: 10.1007/s11207-015-0723-y
Abstract: The last solar minimum is characterized by several peculiar aspects and by the presence of a complex magnetic topology with two different kinds of coronal streamers: pseudo-streamers and bipolar streamers. Pseudo-streamers or unipolar streamer are coronal structures which separate coronal holes of the same polarity, without a current sheet in the outer corona; unlike bipolar streamer that separate coronal holes of opposite magnetic polarity. In this study, two examples of these structures have been identified in the period of Carrington rotation 2067, by applying a potential-field source-surface extrapolation of the photospheric field measurements. We present a spectroscopic analysis of a pseudo-streamer and a bipolar streamer observed in the period 12-17 March 2008 at high spectral and spatial resolution by the Ultraviolet Coronagraph Spectrometer (UVCS; Kohl et al., 1995) onboard Solar and Heliospheric Observatory (SOHO). The solar wind plasma parameters, such as kinetic temperature, electron density and outflow velocity, are inferred in the extended corona (from 1.7 to 2.1 Rsun) analysing the O VI doublet and Ly alpha line spectra. The coronal magnetic topology is taken into account and has been extrapolated by a 3D magneto-hydrodynamic model of the global corona. The results of the analysis show some peculiarities of the pseudo-streamer physical parameters in comparison with those obtained for bipolar streamers: in particular, we have found higher kinetic temperature and higher outflow velocities of O VI ions and lower electron density values. In conclusion, we point out that pseudo-streamers produce a "hybrid" type of outflow that is intermediate between slow and fast solar wind and they are a possible source of slow/fast wind in not dipolar solar magnetic field configuration.
Retrospective survey of avian influenza H5N1 infection in Northern Vietnam by using a combinational serologic assay  [PDF]
Hoa Minh Luong, Sheng-Fan Wang, Vu Tan Trao, Marcelo Chen, Jason C. Huang, Phung Dac Cam, Yu-Ting Lin, Yi-Ming Arthur Chen
Health (Health) , 2012, DOI: 10.4236/health.2012.430149
Abstract: Outbreaks of highly pathogenic avian influenza H5N1 virus have occurred in Vietnam since 2003. However, how people got avian H5N1 infection in Northern Vietnam is still unclear. We therefore performed a combination of the serologic assays H5N1 ELISA and H5 western blot to detect anti-H5N1 specific antibodies. Sera samples of 149 subjects with suspected H5N1 infection from three provinces of Northern Vietnam were collected from September 2006 to March 2007. Our results indicated that this combinational assay showed high sensitivity (100%) and specificity (95%) when compared with hemagglutinin inhibition (HI) assay. Fifty-one sera samples (34.2%) contained specific antibodies against H5N1 viruses. Poultry raisers (32/77; 41.6%) showed higher H5N1 infection rates than slaughterers (12/41; 29.3%) and health care workers (7/31; 22.6%). Contact history with sick or dead poultry in household or slaughter-house (p < 0.05) and lack of protective equipment use when in contact with dead poultry (p < 0.05) were risk factors found to be associated with H5N1 infection. In this study, we established an alternative serologic assay for H5N1 diagnosis, and we hereby present seroepidemiologic data of H5N1 infection in Northern Vietnam.
Estimation of Fine Particulate Matter in Taipei Using Landuse Regression and Bayesian Maximum Entropy Methods
Hwa-Lung Yu,Chih-Hsih Wang,Ming-Che Liu,Yi-Ming Kuo
International Journal of Environmental Research and Public Health , 2011, DOI: 10.3390/ijerph8062153
Abstract: Fine airborne particulate matter (PM 2.5) has adverse effects on human health. Assessing the long-term effects of PM 2.5 exposure on human health and ecology is often limited by a lack of reliable PM 2.5 measurements. In Taipei, PM 2.5 levels were not systematically measured until August, 2005. Due to the popularity of geographic information systems (GIS), the landuse regression method has been widely used in the spatial estimation of PM concentrations. This method accounts for the potential contributing factors of the local environment, such as traffic volume. Geostatistical methods, on other hand, account for the spatiotemporal dependence among the observations of ambient pollutants. This study assesses the performance of the landuse regression model for the spatiotemporal estimation of PM 2.5 in the Taipei area. Specifically, this study integrates the landuse regression model with the geostatistical approach within the framework of the Bayesian maximum entropy (BME) method. The resulting epistemic framework can assimilate knowledge bases including: (a) empirical-based spatial trends of PM concentration based on landuse regression, (b) the spatio-temporal dependence among PM observation information, and (c) site-specific PM observations. The proposed approach performs the spatiotemporal estimation of PM 2.5 levels in the Taipei area (Taiwan) from 2005–2007.
Objective Combined Evaluation Model for Optimizing Water Resource Engineering Schemes

JIN Ju-liang~,WANG Ming-wu~,WEI Yi-ming~,

系统工程理论与实践 , 2004,
Abstract: The key problem in optimizing water resource engineering schemes is how to determine with reason weights of the evaluation indexes of water resource engineering schemes. For this reason, in this paper the whole diversity information of evaluation index sample values can be mined by using projection pursuit evaluation method based on ideal solution point method and accelerating genetic algorithm (TOPSIS-PP). The local diversity information of evaluation index sample values can be mined by using improved fuzzy analytic hierarchy process evaluation method based on accelerating genetic algorithm (AGA-FAHP). And then an objective combined evaluation model (OCEM) was made through integrating TOPSIS-PP and AGA-FAHP for comprehensive evaluation of water resource engineering schemes. The research results show that the evaluation index samples information is utilized much sufficiently by using OCEM, that the decision-making information is more rich and impersonal provided by OCEM than by the common projection pursuit methods, that importance of each valuation index can be recognized in comprehensive evaluation of water resource engineering schemes, and that computation result of OCEM is objective, stability and distinguishability, so it can be widely applied to different engineering scheme optimization.
Volatility and Nonlinear Dependence in the Returns of China''''s Security Markets

ZHAO Liu-yan,WANG Yi-ming,

系统工程理论与实践 , 2005,
Abstract: We investigate the serial dependence of the returns of the Shanghai Composite Index and Shenzhen Component Index.Although the data exhibit no significantly linear autocorrelation,substantial evidence indicates the presence of nonlinear dependence.Further examination shows that the nonlinearities of the two return series are mainly due to autoregressive conditional heteroskedasticity(ARCH) effects,for each series will be independent after filtered through a certain ARCH model.
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