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Search Results: 1 - 10 of 127596 matches for " Xiao-dong Liu "
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Spectral dispersion of cloud droplet size distributions and radar threshold reflectivity for drizzle

Xie Xiao-Ning,Liu Xiao-Dong,

中国物理 B , 2010,
Abstract: From first principles, we find that the radar threshold reflectivity between nonprecipitating clouds and precipitating clouds is strongly related to not only the cloud droplet number concentration but also the spectral dispersion of cloud droplet size distributions. The further investigation indicates that the threshold value is an increasing function of spectral dispersion and cloud droplet number concentration. These results may improve our understanding of the cloud-precipitation interaction and the aerosol indirect effect.
Studies on face contour extraction from approximate skin color backgrounds

LIU Rui,WANG Xiao-dong,

计算机应用 , 2005,
Abstract: A new face contour extraction method was proposed by useing skin color and multiple information fusion. The method computed skin probability image based on TSL color space, then selected seed point, finally used multiple information to carry out region growing, extracted face contour. The method employed image pyramid process to avoid heavy computing burdens caused by region growth. Experiment results indicated that the proposed algorithm can extract face contour from approximate skin color backgrounds efficiently and accurately, and bears noise endurance and application adaptability.
The Maximum Wiener Index of Trees with Given Degree Sequences
Xiao-Dong Zhang,Yong Liu,Min-Xian Han
Mathematics , 2009,
Abstract: The Wiener index of a connected graph is the sum of topological distances between all pairs of vertices. Since Wang gave a mistake result on the maximum Wiener index for given tree degree sequence, in this paper, we investigate the maximum Wiener index of trees with given degree sequences and extremal trees which attain the maximum value.
Microstructured hydroxyl environments and Raman spectroscopy in selected basic transition-metal halides

Liu Xiao-Dong,Meng Dong-Dong,Hagihala Masato,Zheng Xu-Guang,

中国物理 B , 2011,
Research and implementation of program condition visualization based on AOP

SHAO Fu-dong,LIU Xiao-dong,YANG Bao-ming,

计算机应用 , 2006,
Abstract: This paper described the concept of Aspect Oriented Programming(AOP) and its advantages of solving crosscutting concerns, discussed its application in the field of program condition visualization and presented an example of program condition visualization in the program of Evaluation of Expression by using AOP technology. The function of program condition visualization usually appears as crosscutting concern. Compared with Object Oriented Programming(OOP)technology, AOP technology provides a more loose-couple approach to modularize crosscutting concerns.
Get Phases from Arsenic Anomalous Scattering: de novo SAD Phasing of Two Protein Structures Crystallized in Cacodylate Buffer
Xiang Liu, Heng Zhang, Xiao-Jun Wang, Lan-Fen Li, Xiao-Dong Su
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0024227
Abstract: The crystal structures of two proteins, a putative pyrazinamidase/nicotinamidase from the dental pathogen Streptococcus mutans (SmPncA) and the human caspase-6 (Casp6), were solved by de novo arsenic single-wavelength anomalous diffraction (As-SAD) phasing method. Arsenic (As), an uncommonly used element in SAD phasing, was covalently introduced into proteins by cacodylic acid, the buffering agent in the crystallization reservoirs. In SmPncA, the only cysteine was bound to dimethylarsinoyl, which is a pentavalent arsenic group (As (V)). This arsenic atom and a protein-bound zinc atom both generated anomalous signals. The predominant contribution, however, was from the As anomalous signals, which were sufficient to phase the SmPncA structure alone. In Casp6, four cysteines were found to bind cacodyl, a trivalent arsenic group (As (III)), in the presence of the reducing agent, dithiothreitol (DTT), and arsenic atoms were the only anomalous scatterers for SAD phasing. Analyses and discussion of these two As-SAD phasing examples and comparison of As with other traditional heavy atoms that generate anomalous signals, together with a few arsenic-based de novo phasing cases reported previously strongly suggest that As is an ideal anomalous scatterer for SAD phasing in protein crystallography.
Tensor Based Image Edge Detection and Filtration

WANG Xiao-ming,GU Xiao-dong,LIU Jian,

中国图象图形学报 , 2002,
Abstract: This paper put forward a method of image edge detection and filtration on the curve coordinate system by the use of operator on the curve coordinate system.Edge detection is a important process in image processing, currently the popular method firstly to be used is the Laplacian operator on the Cartesian coordinate system, then the zero-crossing of the Laplacian operator can be found as edge point; image filtration is the convolution result of the differential operator on the Cartesian coordinate system too. It is not fit to deal with many images painted on surfaces such as cylindrical map image, spherical map image,digital effects for motion pictures and medical regime on three dimensional scans of organs. We make use of the differential operator on the curve coordinate system for processing images on surfaces. The practical numerical experiment results showed that differential operator on the curve coordinate system is capability for processing images on surfaces.
Role of CD28/B7 costimulation and IL-12/IL-10 interaction in the radiation-induced immune changes
Shu-Zheng Liu, Shun-Zi Jin, Xiao-Dong Liu, Yi-Min Sun
BMC Immunology , 2001, DOI: 10.1186/1471-2172-2-8
Abstract: The stimulatory effect of low dose radiation (LDR) on the proliferative response of lymphocytes to Con A was found to require the presence of APCs. The addition of APCs obtained from both low- and high-dose-irradiated mice to splenic lymphocytes separated from low-dose-irradiated mice caused stimulation of lymphocyte proliferation. B7-1/2 expression on APCs was up-regulated after both low and high doses of radiation. There was up-regulation of CD28 expression on splenic and thymic lymphocytes after LDR and its suppression after high dose radiation (HDR), and cytotoxic T lymphocyte-associated antigen 4 (CTLA-4) expression showed changes in the opposite direction. IL-12 secretion by macrophages was stimulated after both low and high doses of radiation, but IL-10 synthesis by splenocytes was suppressed by low dose radiation and up-regulated by high dose radiation.The status of CD28/CTLA-4 expression on T lymphocytes in the presence of up-regulated B7 expression on APCs determined the outcome of the immune changes in response to radiation, i.e., up-regulation of CD28 after LDR resulted in immunoenhancement, and up-regulation of CTLA-4 associated with down-regulation of CD28 after HDR led to immunosuppression. Both low and high doses of radiation up-regulated B7-1/2 expression on APCs. After LDR, the stimulated proliferative effect of increased IL-12 secretion by APCs, reinforced by the suppressed secretion of IL-10, further strengthened the intracellular signaling induced by B7-CD28 interaction.It is well known that the immune system responds to ionizing radiation with distinct characteristics depending on the dose and dose-rate [1,2]. The prominent suppressive effect of lethal and sublethal doses of ionizing radiation on immunity and hemopoiesis constitutes the basis of the chief clinical manifestations of acute radiation syndrome while the stimulatory effect of low dose radiation (LDR) as disclosed in recent years has even greater significance in understanding the hea
Diurnal variation of summer rainfall over the Tibetan Plateau and its neighboring regions revealed by TRMM Multi-satellite Precipitation Analysis

BAI Ai-Juan,LIU Chang-Hai,LIU Xiao-Dong,

地球物理学报 , 2008,
Abstract: This paper investigates the diurnal variations of summertime precipitation over the Tibetan Plateau and its neighboring regions using the TRMM Multi-satellite Precipitation Analysis(TMPA)product during 2002~2006.We first compare the TMPA data with rain-gauge observations to demonstrate their applicability and fidelity.Both diurnal composite and harmonic analyses are employed to examine the diurnal cycles of precipitation intensity and frequency.Results show remarkable daily variability in summer precipitation over the Tibetan Plateau and nearby areas.The strongest diurnal oscillation occurs in the central Plateau,and other significant diurnal signal is present in the Indian Peninsula,to southwest of the Plateau.The occurrence of the maximum/minimum rainfall intensity and frequency has salient geographical dependence.On the whole,a late-afternoon-evening maximum is dominant in the central Plateau,whereas a late-night maximum is prevalent around the Plateau periphery and in Sichuan Basin,and a morning and afternoon maximum appear in the upper and mid-lower reaches of the Yangtze River,respectively.There is a coherent diurnal variation pattern east of the Plateau,characterized by systematically delayed precipitation away from the Plateau.The significant nocturnal rainfall in Sichuan Basin is likely associated with eastward-propagating convective systems originated over the Tibetan Plateau.
Bioinformatics and Structural Characterization of a Hypothetical Protein from Streptococcus mutans: Implication of Antibiotic Resistance
Jie Nan, Erik Brostromer, Xiang-Yu Liu, Ole Kristensen, Xiao-Dong Su
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0007245
Abstract: As an oral bacterial pathogen, Streptococcus mutans has been known as the aetiologic agent of human dental caries. Among a total of 1960 identified proteins within the genome of this organism, there are about 500 without any known functions. One of these proteins, SMU.440, has very few homologs in the current protein databases and it does not fall into any protein functional families. Phylogenetic studies showed that SMU.440 is related to a particular ecological niche and conserved specifically in some oral pathogens, due to lateral gene transfer. The co-occurrence of a MarR protein within the same operon among these oral pathogens suggests that SMU.440 may be associated with antibiotic resistance. The structure determination of SMU.440 revealed that it shares the same fold and a similar pocket as polyketide cyclases, which indicated that it is very likely to bind some polyketide-like molecules. From the interlinking structural and bioinformatics studies, we have concluded that SMU.440 could be involved in polyketide-like antibiotic resistance, providing a better understanding of this hypothetical protein. Besides, the combination of multiple methods in this study can be used as a general approach for functional studies of a protein with unknown function.
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