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Search Results: 1 - 10 of 16748 matches for " Q. Shao "
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An -Estimation-Based Procedure for Determining the Number of Regression Models in Regression Clustering
C. R. Rao,Y. Wu,Q. Shao
Advances in Decision Sciences , 2007, DOI: 10.1155/2007/37475
Abstract: In this paper, a procedure based on M-estimation to determine the number of regression models for the problem of regression clustering is proposed. We have shown that the true classification is attained when n increases to infinity under certain mild conditions, for instance, without assuming normality of the distribution of the random errors in each regression model.
Geometric isomorphism and minimum aberration for factorial designs with quantitative factors
Shao-Wei Cheng,Kenny Q. Ye
Mathematics , 2005, DOI: 10.1214/009053604000000599
Abstract: Factorial designs have broad applications in agricultural, engineering and scientific studies. In constructing and studying properties of factorial designs, traditional design theory treats all factors as nominal. However, this is not appropriate for experiments that involve quantitative factors. For designs with quantitative factors, level permutation of one or more factors in a design matrix could result in different geometric structures, and, thus, different design properties. In this paper indicator functions are introduced to represent factorial designs. A polynomial form of indicator functions is used to characterize the geometric structure of those designs. Geometric isomorphism is defined for classifying designs with quantitative factors. Based on indicator functions, a new aberration criteria is proposed and some minimum aberration designs are presented.
Molecular cloning of lipopolysaccharide genes of the Vibrio cholerae in E. coli HB101]
霍乱弧菌脂多糖基因在大肠杆菌中的克隆

H Shao,Q Ma,
邵蝗
,马清钧

微生物学报 , 1991,
Abstract: A genomic library of the V. cholerae 178 (Eltor biotype, Ogawa serotype) was constructed by using cosmid pHC 79 as a cloning vector. We screened the library with immune agglutination test and colonies solid phase ELISA. 13 positive recombinants which could express the O antigen of the V. cholerae lipopolysaccharide (LPS) were acquired. The LPS was then extracted from a positive recombinant PMM-VO 38 by using hot phenol-water method. It was found that purified LPS specifically reacted to antisomatic serum against the V. cholerae. The restriction endonucleases analysis showed that the molecular weight of the recombination cosmid PMM-VO 38 was about 46 kb.
Source apportionment of fine organic aerosols in Beijing
Q. Wang,M. Shao,Y. Zhang,Y. Wei
Atmospheric Chemistry and Physics Discussions , 2009,
Abstract: Fine particles (PM2.5, i.e., particles with an aerodynamic diameter of ≤2.5 μm) were collected from the air in August 2006, August–September 2006, and January–February 2007, in Beijing, China. Particulate organic matter in the ambient samples was quantified by gas chromatography/mass spectrometry. The dominant compounds identified in summertime were n-alkanoic acids, followed by dicarboxylic acids and sugars, while sugars became the most abundant species in winter, followed by polycyclic aromatic hydrocarbons, n-alkanes, and n-alkanoic acids. The contributions of seven emission sources (i.e., gasoline/diesel vehicles, coal burning, wood/straw burning, cooking, and vegetative detritus) to particulate organic matter in PM2.5 were estimated using a chemical mass balance receptor model. The model runs the present seasonal trends regarding the contributions of various sources to organic aerosols. Biomass burning (straw and wood) had the highest contribution in winter, followed by coal burning, vehicle exhaust, and cooking. The contribution of cooking was the highest in summer, followed by vehicle exhaust and biomass burning, while coal smoke showed only a minor contribution to ambient organic carbon.
Temperature changes of the past 2000 yr in China and comparison with Northern Hemisphere
Q. Ge,Z. Hao,J. Zheng,X. Shao
Climate of the Past Discussions , 2013, DOI: 10.5194/cpd-9-507-2013
Abstract: In this paper, we use principal components and partial least squares regression analysis to reconstruct a composite profile of temperature variations in China, and the associated uncertainties, at a decadal resolution over the past 2000 yr. Our aim is to contribute a new temperature time series to the paleoclimatic strand of the Asia2K working group, which is part of the PAGES (Past Global Changes) project. The reconstruction was developed using proxy temperature data, with relatively high confidence levels, from five locations across China, and an observed temperature dataset provided by Chinese Meteorological Administration covering the decades from the 1870s to the 1990s. Relative to the 1870s–1990s climatology, our two reconstructions both show three warm intervals during the 270s–390s, 1080s–1210s, and after the 1920s; temperatures in the 260s–400s, 560s–730s and 970s–1250s were comparable with those of the Present Warm Period. Temperature variations over China are typically in phase with those of the Northern Hemisphere (NH) after 1100, a period which covers the Medieval Climate Anomaly, Little Ice Age, and Present Warm Period. The recent rapid warming trend that developed between the 1840s and the 1930s occurred at a rate of 0.91° C/100 yr. The temperature difference between the cold spell ( 0.74° C in the 1650s) during the Little Ice Age, and the warm peak of the Present Warm Period (0.08° C in the 1990s) is 0.82° C at a centennial time scale.
Resistance Quenching in Graphene Interconnects
Q. Shao,G. Liu,D. Teweldebrhan,A. A. Balandin
Physics , 2008,
Abstract: We investigated experimentally the high-temperature electrical resistance of graphene interconnects. The test structures were fabricated using the focused ion beam from the single and bi-layer graphene produced by mechanical exfoliation. It was found that as temperature increases from 300 to 500K the resistance of the single- and bi-layer graphene interconnects drops down by 30% and 70%, respectively. The quenching and temperature dependence of the resistance were explained by the thermal generation of the electron-hole pairs and acoustic phonon scattering. The obtained results are important for the proposed applications of graphene as interconnects in integrated circuits.
On the Spin Period Distribution in Be/X-ray Binaries
Z. -Q. Cheng,Y. Shao,X. -D. Li
Physics , 2014, DOI: 10.1088/0004-637X/786/2/128
Abstract: There is a remarkable correlation between the spin periods of the accreting neutron stars in Be/X-ray binaries (BeXBs) and their orbital periods . Recently Knigge et al. (2011) showed that the distribution of the spin periods contains two distinct subpopulations peaked at $\sim 10$ s and $\sim 200$ s respectively, and suggested that they may be related to two types of supernovae for the formation of the neutron stars, i.e., core-collapse and electron-capture supernovae. Here we propose that the bimodal spin period distribution is likely to be ascribed to different accretion modes of the neutron stars in BeXBs. When the neutron star tends to capture material from the warped, outer part of the Be star disk and experiences giant outbursts, a radiatively-cooling dominated disk is formed around the neutron star, which spins up the neutron star, and is responsible for the short period subpopulation. In BeXBs that are dominated by normal outbursts or persistent, the accretion flow is advection-dominated or quasi-spherical. The spin-up process is accordingly inefficient, leading to longer periods of the neuron stars. The potential relation between the subpopulations and the supernova mechanisms is also discussed.
Couplings between Majorana bound states mediated by topologically-trivial chains
Z. C. Shi,X. Q. Shao,X. X. Yi
Physics , 2015,
Abstract: We examine the couplings between two Majorana bound states mediated by topologically-trivial chains. Four types of chain are considered, e.g., the Kitaev chain with/without pairing couplings to the Majorana fermion, the Kitaev chain with next nearest-neighbor couplings in itself, and the Kitaev chain driven by a periodic field. We find that the induced coupling strength depends strikingly on the pairing coupling, the long-range interaction, and the frequency as well as the amplitude of the driving field. We calculate the dependence of the coupling strength on the parameters of the central chain and discuss the application of the coupled Majorana bound states.
Development of specific RAPD markers for identifying albino tea cultivars ‘Qiannianxue’ and ‘Xiaoxueya’
KR Wang, YY Du, SH Shao, C Lin, Q Ye, JL Lu, YR Liang
African Journal of Biotechnology , 2010,
Abstract: Albino tea cultivars grow white leaves at low temperature which are valuable materials for processing green tea, but they develop green leaves in summer and autumn seasons. It is difficult to discriminate albino tea cuttings from the normal tea cuttings by leaf colour and plant morphological characteristics. Specific RAPD markers for identifying albino tea cultivars ‘Qiannianxue’ and ‘Xiaoxueya’ were developed in the present paper and they can be used in the authentication of the two albino tea cultivars. An amplified fragment (about 1500 bp) from Primer (S 12 (Sangon Biological Engineering Technology and Services Co., Ltd.) was identified in the albino teas and not from the widely cultivated cultivar; Fudingdabai.
Source apportionment of fine organic aerosols in Beijing
Q. Wang, M. Shao, Y. Zhang, Y. Wei, M. Hu,S. Guo
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2009,
Abstract: Fine particles (PM2.5, i.e., particles with an aerodynamic diameter of ≤2.5 μm) were collected from the air in August 2005, August–September 2006, and January–February 2007, in Beijing, China. The chemical compositions of particulate organic matter in the ambient samples were quantified by gas chromatography/mass spectrometry. The dominant compounds identified in summertime were n-alkanoic acids, followed by dicarboxylic acids and sugars, while sugars became the most abundant species in winter, followed by polycyclic aromatic hydrocarbons, n-alkanes, and n-alkanoic acids. The contributions of seven emission sources (i.e., gasoline/diesel vehicles, coal burning, wood/straw burning, cooking, and vegetative detritus) to particulate organic matter in PM2.5 were estimated using a chemical mass balance receptor model. The model results present the seasonal trends of source contributions to organic aerosols. Biomass burning (straw and wood) had the highest contribution in winter, followed by coal burning, vehicle exhaust, and cooking. The contribution of cooking was the highest in summer, followed by vehicle exhaust and biomass burning, while coal smoke showed only a minor contribution to ambient organic carbon.
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