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Search Results: 1 - 10 of 83575 matches for " Zhu Yang "
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TV Sparsifying MR Image Reconstruction in Compressive Sensing  [PDF]
Yonggui Zhu, Xiaolan Yang
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.21007
Abstract: In this paper, we apply alternating minimization method to sparse image reconstruction in compressed sensing. This approach can exactly reconstruct the MR image from under-sampled k-space data, i.e., the partial Fourier data. The convergence analysis of the fast method is also given. Some MR images are employed to test in the numerical experi-ments, and the results demonstrate that our method is very efficient in MRI reconstruction.
A Dyadic Wavelet Filtering Method for 2-D Image Denoising  [PDF]
Yonggui Zhu, Xiaolan Yang
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.24044
Abstract: We improve spatially selective noise filtration technique proposed by Xu et al. and wavelet transform scale filtering approach developed by Zheng et al. A novel dyadic wavelet transform filtering method for image denoising is proposed. This denoising approach can reduce noise to a high degree while preserving most of the edge features of images. Different types of images are employed to test in the numerical experiments. The experimental results show that our filtering method can reduce more noise contents while maintaining more edges than hard-threshold, soft-threshold filters, Xu’s method and Zheng’s method.
Restoration Study of Microorganisms in Lake Water Purification  [PDF]
Fang Yang, Rui Zhu
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B094

We screened the bacteria with restoration and purification functions in lake water and found that,Bacillus subtilishad the highest water purification ability. Photosynthetic bacteria, lactobacillus bacteria, nitrifying bacteria and oligotrophic bacteria also showed different levels of lake water purification and restoration. L1873orthogonal experiments were designed to optimize the ratio of complex agents to get the best ratio of various bacteria as 10g/LBacillus subtilis, 2g/L photosynthetic bacteria, 0.8g/L lactobacillus, 0.6g/L nitrifying bacteria 1, 0.4g/L nitrifying bacteria 2 and 0.6g/L oli-gotrophic bacteria. When lake water was purified for 30 d under this ratio, total phosphorus content decreased 85.90%, total nitrogen content decreased 70.96%, and COD value decreased 81.19%.

Screening and Fermentation Characteristics of PHA Bacteria in Activated Sludge  [PDF]
Fang Yang, Rui Zhu
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B096

Using sludge at the bottom of Hengshui Lake as samples, and screened out the SJ-9 strain with PHA synthesis capability by enrichment, purification, Nile blue staining, far-infrared spectroscopy and gas qualitative and quantitative analysis. The infrared scanning of SJ-9 bacteria product showed that this product was middle chain PHA. Optimization of SJ-9 fermentation conditions obtained the optimal conditions with optimal carbon source of sodium butyrate, optimal C/N of 35, optimal fermentation time of 120 h, and optimal initial pH for culture substrate of 7.0. 10 L fermenter amplification culture under these conditions showed consistent results with flask culture, and the bacteria and PHA had the highest yields at 120 h, with the maximal yields of 6.81 and 2.36 g/L, respectively.

Religion and People’s Choice of Financial Assets: A Research Based on CGSS2010  [PDF]
Yang Li, Pan Zhu
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.44002
Abstract: As an important part of culture, religion can influence people’s attitude about worth and wealth, thus their economical behavior and financial decisions. Based on CGSS2010 data, this paper analyzes the relationship between religion and people’s choice of financial assets. The empirical results of this paper show that, those who believe in religion are more willing to hold risk assets than those who do not believe in religion, including the stocks and funds, bonds, etc.
A Semi-Lagrangian Type Solver for Two-Dimensional Quasi-Geostrophic Model on a Sphere  [PDF]
Quanyong Zhu, Yan Yang
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.718181
Abstract: In this?paper, we propose a numerical method based on semi-Lagrangian approach for solving quasi-geostrophic (QG) equations on a sphere. Using potential vorticity and stream-function as prognostic variables, two-order centered difference is suggested on the latitude-longitude grid. In our proposed numerical scheme, advection terms are expressed in a Lagrangian frame of reference to circumvent the CFL restriction. The pole singularity associated with the latitude-longitude grid is eliminated by a smoothing technique for the initial flow. Error analysis is provided for the numerical scheme.
The Safety of Walking Space for the Elderly People Living in Communities in Beijing, China  [PDF]
Shuwen Yang, Qing Zhu
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.54014
Abstract: China has become an aging society. Aging in place is an important option for the elderly people in China due to the influence of Chinese tradition. Communities are the environment where the elderly people spend most of their time. The walking space in the communities is important for the safety of the elderly people. The research studied the safety of walking space of the elderly people living in the communities by using the data collected by observation, interviews and questionnaire surveys. The results identified three types of risks which are caused by pavements, public facilities and surrounding environment based on the qualitative analysis. The results of the quantitative analysis by using SPSS 19.0 found that the risks are highest in surrounding environment than the pavements and public facilities. The public facilities have the lowest risks. The findings of this study provide knowledge for future transformation of the old communities and the planning of new communities.
A Note on ``Anomalous" Chiral Gauge Theories
Zhu Yang
Physics , 1992, DOI: 10.1016/0370-2693(92)90817-N
Abstract: We show that, the lattice regularization of chiral gauge theories proposed by Kaplan, when applied to a (2+1)-dimensional domain wall, produces a (1+1)-dimensional theory at low energy even if gauge anomaly produced by chiral fermions does not cancel. But the corresponding statement is not true in higher dimensions.
Asymptotic Freedom and Dirichlet String Theory, UR-1288, ER-40685-737
Zhu Yang
Physics , 1992,
Abstract: Fixed angle scattering at high energy in a string theory with boundaries satisfying Dirichlet conditions (Dirichlet strings) in $D=4$ is shown to have logarithmic dependence on energy, in addition to the power-like behavior known before. High temperature free energy also depends logarithmically on temperature. Such a result could provide a matching mechanism between strings at long distance and asymptotic freedom at short distance, which is necessary for the reformulation of large-$N$ QCD as a string theory.
A Remark on Conformal Anomaly and Extrinsic Geometry of Random Surfaces
Zhu Yang
Physics , 1991, DOI: 10.1016/0370-2693(92)91838-Z
Abstract: In low dimensions, conformal anomaly has profound influence on the critical behavior of random surfaces with extrinsic curvature rigidity $1/\a$. We illustrate this by making a small $D$ expansion of rigid random surfaces, where a non-trivial infra-red fixed point is shown to exist. We speculate on the renormalization group flow diagram in the $(\a,D)$ plane. We argue that the qualitative behavior of numerical simulations in $D=3, 4$ could be understood on the basis of the phase diagram.
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