SEARCH FOR PULSED γ-RAY EMISSION FROM GLOBULAR CLUSTER M28

Wu, J. H. K.,Hui, C. Y.,Wu, E. M. H.,Kong, A. K. H.,Huang, R. H. H.,Tam, P. H. T.,Takata, J.,Cheng, K. S. IOP Publishing 2013 ASTROPHYSICAL JOURNAL LETTERS - Vol.765 No.2

<P>Using the data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope, we have searched for gamma-ray pulsations from the direction of the globular cluster M28 (NGC 6626). We report the discovery of a signal with a frequency consistent with that of the energetic millisecond pulsar (MSP) PSR B1821-24 in M28. A weighted H-test test statistic of 28.8 is attained, which corresponds to a chance probability of similar to 10(-5) (4.3 sigma detection). With a phase-resolved analysis, the pulsed component is found to contribute similar to 25% of the total observed gamma-ray emission from the cluster. However, the unpulsed level provides a constraint for the underlying MSP population and the fundamental plane relations for the scenario of inverse Compton scattering. Follow-up timing observations in radio/X-ray are encouraged to further investigate this periodic signal candidate.</P>

Variation of magnetic properties with different annealed temperatures in the Ni_3[Fe(CN)_6]_2ㆍXH_2O

M. Liu,X.F. Bian,Y.F. Xia,Z. Bao,H.S. Wu,M.X. Xu 한국물리학회 2011 Current Applied Physics Vol.11 No.3

Molecular magnet nickel(II) hexacyanoferrate(III) powder Ni_3[Fe(CN)_6]_2ㆍXH_2O was prepared by coprecipitation method. The coprecipitated powder was annealed in vacuum at different temperatures of 140,and 160 ℃. Water molecules contained in Prussian blue analogues were removed by heating. The annealing of Ni^II ferricyanide induced an inner charge transfer from Ni^II towards Fe^III to form the mixed valence system Ni(II) Ni(III) ferri-ferro-cyanide. Variation of magnetic properties with different annealed temperatures was studied by elemental analysis, powder X-ray diffraction, transmission electron microscopy, Fourier transform infrared, and Mössbauer and magnetization measurements. The differences in magnetic phase transition temperature, coercivity, remanence and effective magnetization are studied. Differences in magnetic properties may be attributed to a partial charge transfer from Ni^II to Fe^III.

Study of the dry methane reforming process using a rotating gliding arc reactor

Wu, A.,Yan, J.,Zhang, H.,Zhang, M.,Du, C.,Li, X. Pergamon Press 2014 International journal of hydrogen energy Vol.39 No.31

Dry methane reforming (DMR) via rotating gliding arc (RGA) discharge, co-driven by a magnetic field and tangential flow, was investigated in this study. Optical emission spectroscopy (OES) was used to characterize the major active species (energetic electrons, radicals, ions, atoms and excited molecules) in the DMR chemical process. The influence of the operational conditions (applied voltage and CH<SUB>4</SUB>/CO<SUB>2</SUB> ratio) on the basic spectroscopic parameters (electron excitation temperature, electron density and rotational temperature) was determined by spectroscopic methods. The rotational and electron excitation temperatures were approximately 1100-1200 K and 1.1-1.7 eV, respectively, indicating the non-thermal equilibrium characteristics of the RGA discharge. The electron density was approximately 5-20 x 10<SUP>21</SUP> m<SUP>-3</SUP> by fitting the line shape of H<SUB>α</SUB> at 656 nm. The conversions of the reactants (CH<SUB>4</SUB> and CO<SUB>2</SUB>) and the selectivities of the products (H<SUB>2</SUB>, CO and C<SUB>2</SUB> hydrocarbon) were analyzed using a gas chromatograph (GC) under different energy inputs or feed gas proportions. The structure and morphology of carbon black produced during the chemical process was characterized by high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy, indicating the properties of electrical conductivity and high absorption capacity that can be useful for potential application.

Evaluation of a commercial orthopaedic metal artefact reduction tool in radiation therapy of patients with head and neck cancer.

Kwon, H,Kim, K S,Chun, Y M,Wu, H-G,Carlson, J N K,Park, J M,Kim, J-I British Institute of Radiology 2015 The British journal of radiology Vol.88 No.1052

<P>To assess the image quality and dosimetric effects of the Philips orthopaedic metal artefact reduction (OMAR) (Philips Healthcare System, Cleveland, OH) function for reducing metal artefacts on CT images of head and neck (H&N) patients.</P>

Boron adsorption mechanism of a hybrid gel derived from tetraethoxysilane and bis(trimethoxysilylpropyl)amine

Liu, H.,Qing, B.,Ye, X.,Guo, M.,Li, Q.,Wu, Z.,Lee, K.,Lee, D.,Lee, K. 한국물리학회 2009 Current Applied Physics Vol.9 No.4_SUP

An organic/inorganic hybrid gel was prepared with tetraethoxysilane (TEOS) and bis(trimethoxysilylpropyl)amine (TSPA) as precursors. The adsorption of boron on the hybrid gel in aqueous solutions was investigated comprehensively by varying the initial boron concentration, pH, ionic strength, and temperature. The equilibrium adsorption amount of boron increases with the increase in initial boron concentration and ionic strength, but decreases with the increase in temperature. The adsorption amount exhibits a maximum at initial pH of 4-10. Boron appears to be adsorbed in both H<SUB>3</SUB>BO<SUB>3</SUB> and B(OH)<SUB>4</SUB><SUP>-</SUP> forms through the hydrogen bonding, electrostatic and hydrophobic attractions.

Association of Genetic Variants in Complement Factor H and Factor H-Related Genes with Systemic Lupus Erythematosus Susceptibility

Zhao, Jian,Wu, Hui,Khosravi, Melanie,Cui, Huijuan,Qian, Xiaoxia,Kelly, Jennifer A.,Kaufman, Kenneth M.,Langefeld, Carl D.,Williams, Adrienne H.,Comeau, Mary E.,Ziegler, Julie T.,Marion, Miranda C.,Adl Public Library of Science 2011 PLoS genetics Vol.7 No.5

<▼1><P>Systemic lupus erythematosus (SLE), a complex polygenic autoimmune disease, is associated with increased complement activation. Variants of genes encoding complement regulator factor H (CFH) and five CFH-related proteins (CFHR1-CFHR5) within the chromosome 1q32 locus linked to SLE, have been associated with multiple human diseases and may contribute to dysregulated complement activation predisposing to SLE. We assessed 60 SNPs covering the <I>CFH</I>-<I>CFHRs</I> region for association with SLE in 15,864 case-control subjects derived from four ethnic groups. Significant allelic associations with SLE were detected in European Americans (EA) and African Americans (AA), which could be attributed to an intronic <I>CFH</I> SNP (rs6677604, in intron 11, <I>P</I><SUB>meta</SUB> = 6.6×10<SUP>−8</SUP>, OR = 1.18) and an intergenic SNP between <I>CFHR1</I> and <I>CFHR4</I> (rs16840639, <I>P</I><SUB>meta</SUB> = 2.9×10<SUP>−7</SUP>, OR = 1.17) rather than to previously identified disease-associated <I>CFH</I> exonic SNPs, including I62V, Y402H, A474A, and D936E. In addition, allelic association of rs6677604 with SLE was subsequently confirmed in Asians (AS). Haplotype analysis revealed that the underlying causal variant, tagged by rs6677604 and rs16840639, was localized to a ∼146 kb block extending from intron 9 of <I>CFH</I> to downstream of <I>CFHR1</I>. Within this block, the deletion of <I>CFHR3</I> and <I>CFHR1</I> (<I>CFHR3-1</I>Δ), a likely causal variant measured using multiplex ligation-dependent probe amplification, was tagged by rs6677604 in EA and AS and rs16840639 in AA, respectively. Deduced from genotypic associations of tag SNPs in EA, AA, and AS, homozygous deletion of <I>CFHR3-1</I>Δ (<I>P</I><SUB>meta</SUB> = 3.2×10<SUP>−7</SUP>, OR = 1.47) conferred a higher risk of SLE than heterozygous deletion (<I>P</I><SUB>meta</SUB> = 3.5×10<SUP>−4</SUP>, OR = 1.14). These results suggested that the <I>CFHR3-1</I>Δ deletion within the SLE-associated block, but not the previously described exonic SNPs of <I>CFH</I>, might contribute to the development of SLE in EA, AA, and AS, providing new insights into the role of complement regulators in the pathogenesis of SLE.</P></▼1><▼2><P><B>Author Summary</B></P><P>Systemic lupus erythematosus (SLE) is a complex autoimmune disease, associated with increased complement activation. Previous studies have provided evidence for the presence of SLE susceptibility gene(s) in the chromosome 1q31-32 locus. Within 1q32, genes encoding complement regulator factor H (CFH) and five CFH-related proteins (CFHR1-CFHR5) may contribute to the development of SLE, because genetic variants of these genes impair complement regulation and predispose to various human diseases. In this study, we tested association of genetic variants in the region containing <I>CFH</I> and <I>CFHRs</I> with SLE. We identified genetic variants predisposing to SLE in European American, African American, and Asian populations, which might be attributed to the deletion of <I>CFHR3</I> and <I>CFHR1</I> genes but not previously identified disease-associated exonic variants of <I>CFH</I>. This study provides the first evidence for consistent association between <I>CFH/CFHRs</I> and SLE across multi-ancestral SLE datasets, providing new insights into the role of complement regulators in the pathogenesis of SLE.</P></▼2>

A Markov jump model approach to reliable event-triggered retarded dynamic output feedback H_~ control for networked systems

Wang, J.,Chen, M.,Shen, H.,Park, J.H.,Wu, Z.G. Elsevier Science B. V., Amsterdam 2017 NONLINEAR ANALYSIS HYBRID SYSTEMS Vol.26 No.-

In this paper, the problem of reliable event-triggered H<SUB>~</SUB> control is addressed for networked control systems by using retarded dynamic output feedback. The randomness of actuators failures is modeled by a stochastic variable in a Markov jump model framework. To guarantee the considered closed-loop system is stochastically stable with a prescribed H<SUB>~</SUB> performance level, a Markov jump event-triggered retarded dynamic output feedback H<SUB>~</SUB> controller is designed in this paper, which is the main purpose of our study. By using the stochastic analysis techniques and novel integral inequalities, some sufficient conditions for the solvability of the addressed problem are derived. Finally, an example using a satellite control system model is provided to explain the validity of the proposed method.

Saccharomyces cerevisiae Live Cells Decreased In vitro Methane Production in Intestinal Content of Pigs

Gong, Y.L.,Liao, X.D.,Liang, J.B.,Jahromi, M.F.,Wang, H.,Cao, Z.,Wu, Y.B. Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.6

An in vitro gas production technique was used in this study to elucidate the effect of two strains of active live yeast on methane ($CH_4$) production in the large intestinal content of pigs to provide an insight to whether active live yeast could suppress $CH_4$ production in the hindgut of pigs. Treatments used in this study include blank (no substrate and no live yeast cells), control (no live yeast cells) and yeast (YST) supplementation groups (supplemented with live yeast cells, YST1 or YST2). The yeast cultures contained $1.8{\times}10^{10}$ cells per g, which were added at the rates of 0.2 mg and 0.4 mg per ml of the fermented inoculum. Large intestinal contents were collected from 2 Duroc${\times}$Landrace${\times}$Yorkshire pigs, mixed with a phosphate buffer (1:2), and incubated anaerobically at $39^{\circ}C$ for 24 h using 500 mg substrate (dry matter (DM) basis). Total gas and $CH_4$ production decreased (p<0.05) with supplementation of yeast. The methane production reduction potential (MRP) was calculated by assuming net methane concentration for the control as 100%. The MRP of yeast 2 was more than 25%. Compared with the control group, in vitro DM digestibility (IVDMD) and total volatile fatty acids (VFA) concentration increased (p<0.05) in 0.4 mg/ml YST1 and 0.2 mg/ml YST2 supplementation groups. Proportion of propionate, butyrate and valerate increased (p<0.05), but that of acetate decreased (p<0.05), which led to a decreased (p<0.05) acetate: propionate (A: P) ratio in the both YST2 treatments and the 0.4 mg/ml YST 1 supplementation groups. Hydrogen recovery decreased (p<0.05) with yeast supplementation. Quantity of methanogenic archaea per milliliter of inoculum decreased (p<0.05) with yeast supplementation after 24 h of incubation. Our results suggest that live yeast cells suppressed in vitro $CH_4$ production when inoculated into the large intestinal contents of pigs and shifted the fermentation pattern to favor propionate production together with an increased population of acetogenic bacteria, both of which serve as a competitive pathway for the available H2 resulting in the reduction of methanogenic archaea.

ORBITAL-PHASE-DEPENDENT γ-RAY EMISSIONS FROM THE BLACK WIDOW PULSAR

Wu, E. M. H.,Takata, J.,Cheng, K. S.,Huang, R. H. H.,Hui, C. Y.,Kong, A. K. H.,Tam, P. H. T.,Wu, J. H. K. IOP Publishing 2012 The Astrophysical journal Vol.761 No.2

<P>We report on evidence for orbital phase dependence of the gamma-ray emission from the PSR B1957+20 black widow system using data from the Fermi Large Area Telescope. We divide an orbital cycle into two regions: one containing the inferior conjunction and the other containing the rest of the orbital cycle. We show that the observed spectra for the different orbital regions are fitted by different functional forms. The spectrum of the orbital region containing the inferior conjunction can be described by a power law with an exponential cutoff (PLE) model, which also gives the best-fit model for the orbital phase without the inferior conjunction, plus an extra component above similar to 2.7 GeV. The emission above 3 GeV in this region is detected with a similar to 7 sigma confidence level. The gamma-ray data above similar to 2.7 GeV are observed to be modulated at the orbital period at the similar to 2.3 sigma level. We anticipate that the PLE component dominant below similar to 2.7 GeV originates from the pulsar magnetosphere. We also show that inverse Compton scattering of the thermal radiation of the companion star off a 'cold' ultrarelativistic pulsar wind can explain the extra component above similar to 2.7 GeV. The black widow pulsar PSR B1957+20 may be a member of a new class of object, in the sense that the system is showing gamma-ray emission with both magnetospheric and pulsar wind origins.</P>

Tumor marker panels in ovarian clear cell carcinoma -for optimization of chemotherapeutic management?

( M. H. Cheng ),( P. H. Wang ),( H. S. Wu ),( N. E. Twu ),( C. C. Yuan ),( M. S. Yen ),( K. C. Chao ),( M. J. Liu ) 대한산부인과학회 2007 대한산부인과학회 학술대회 Vol.93 No.-