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1,214 results on '"Yu, M. Y."'

121. Radial properties of the geodesic acoustic mode.

Author

Zhenqian Li, Jiaqi Dong, Zhengmao Sheng, Yu, M. Y., and Weixing Wang

Subjects
TOROIDAL plasma, DRIFT waves, TOKAMAKS, WAVENUMBER, PHASE velocity
Abstract

In magnetized toroidal plasmas, neoclassical effects and turbulent drift waves can induce the geodesic acoustic mode (GAM). We simulate the GAM using the gyro-kinetic code GTS for typical tokamak parameters and investigate its properties, especially its frequency continuum, evolution of its radial wave number, and propagation characteristics. The simulation results are compared with those of the relevant theory and experiment. It is found that the radial phase velocity of the GAM is roughly proportional to the ion thermal speed. [ABSTRACT FROM AUTHOR]

Published
2017
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123. Collaborative study to establish a World Health Organization International genotype panel for parvovirus B19 DNA nucleic acid amplification technology (NAT)-based assays

Author

Baylis S., Blümel J., Bodiya J., Noedel M., Brown K., Candotti D., Chudy M., Nübling M., Cuypers T., Koppelman M., Eis Hübinger A. M., Gärtner T., Grewing T., Heitmann A., Jochum C., Bochtler Hock H., José M., Halait H., Ohhashi Y., Klotz A., Rieger S., Laue T., Raith S., Lee T.H., Montalvo L., Leparc G., Reynolds B., Linnen J. M., Cory R., Ma L., Yu M. Y., Mannonen L., Lappalainen M., Söderlund Venermo M., Moretti E., Modrow S., Wenzel J., Okada Y., Opp M., Owada T., Padley D., Pichl L., Pisani G., Marino F., Rinckel L., Marley J., Schalasta G., Enders M., Hahn R., Servant Delmas A., Smith R., Albrecht J., Stolz M., Yang Y. C., Cheng H. F., GALLINELLA, GIORGIO, Baylis S., Blümel J., Bodiya J., Noedel M., Brown K., Candotti D., Chudy M., Nübling M., Cuypers T., Koppelman M., Eis-Hübinger A.M., Gallinella G., Gärtner T., Grewing T., Heitmann A., Jochum C., Bochtler-Hock H., José M., Halait H., Ohhashi Y., Klotz A., Rieger S., Laue T., Raith S., Lee TH., Montalvo L., Leparc G., Reynolds B., Linnen J.M., Cory R., Ma L., Yu M.Y., Mannonen L., Lappalainen M., Söderlund-Venermo M., Moretti E., Modrow S., Wenzel J., Okada Y., Opp M., Owada T., Padley D., Pichl L., Pisani G., Marino F., Rinckel L., Marley J., Schalasta G., Enders M., Hahn R., Servant-Delmas A., Smith R., Albrecht J., Stolz M., Yang Y.C., and Cheng H.F.

Subjects
Male, Parvoviridae Infections, International Standard, Genotype, DNA, Viral, Parvovirus B19, Human, Humans, Female, Parvovirus B19, NAT Assay, World Health Organization, Nucleic Acid Amplification Techniques
Abstract

BACKGROUND AND OBJECTIVES: The aim of the collaborative study was to evaluate a panel of plasma samples containing different genotypes of parvovirus B19 (B19V) for use in nucleic acid amplification technology (NAT)-based assays. MATERIALS AND METHODS: The panel of samples [Center for Biologics Evaluation and Research Parvovirus B19 Genotype Panel 1; National Institute for Biological Standards and Control (NIBSC) code number 09/110] comprises four different members, i.e. Member 1, Member 2, Member 3, and Member 4 (M1-M4); these represent genotypes 1, 2, 3a B19V, and a negative plasma control, respectively. Thirty-five laboratories from 13 different countries participated in the study. Participants assayed the panel members concurrently with the 2nd World Health Organization (WHO) International Standard for B19V DNA (NIBSC code 99/802) on four separate occasions. RESULTS: A total of 44 sets of data were returned, 34 from quantitative assays and 10 from qualitative assays. The majority of assays used were in-house and based on real-time PCR. The results showed that all three genotypes were detected consistently by the majority of participants, although a small number of assays detected genotypes 2 and 3 less efficiently, or not at all. Real-time stability studies have indicated that the panel of B19V samples is stable under normal conditions of storage, i.e. ≤-70°C. CONCLUSIONS: The four-member panel is intended for use in evaluating the ability of NAT assays to detect different B19V genotypes (M1-M3). Based on the results of the collaborative study, the panel was established as the 1st WHO International Reference Panel for parvovirus B19 genotypes.

Published
2011

136. Instabilities of current-sheet with a nonuniform guide field.

Author

Feng Huang, Jinrong Xu, Fei Yan, Min Zhang, and Yu, M. Y.

Subjects
CURRENT sheets, NON-uniform flows (Fluid dynamics), VLASOV equation, PLASMA instabilities, PLASMA equilibrium
Abstract

Instability of a force-free current sheet with a localized nonuniform guide field in a Vlasov-Maxwell plasma is investigated. Two oppositely propagating linearly unstable modes with quite different mode structures are found. The growth rate of one mode varies nonmonotonically with the magnitudes of the guide field and the main-field aligned component of its wave vector. The unstable mode is weakened as the guide-field nonuniformity is reduced, and it vanishes when the guide field becomes uniform. The growth rate of the other mode is almost unaffected by the guide field nonuniformity. However, it decreases monotonously with the magnitudes of the guide field and the wavevector component in the direction of the main field. [ABSTRACT FROM AUTHOR]

Published
2017
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149. Establishment of the first World Health Organization International Standard for human parvovirus B19 DNA nucleic acid amplification techniques

Author

Saldanha, J., Lelie, N., Yu, M.W., Heath, A., Albrecht, J., Buhr, S., Roth, W., Chaput, C., Chudy, M., Schmidt, I., Cohen, B., Defer, C., Lefebvre, C., Doyle, S., Daly, P., Echevarria, J., Erdman, D., Anderson, B., Fang, R., Johnstone, D., Gierman, T., Gross, P., Held, I., Jarvis, L., Cleland, A., Lazo, A., Gibaja, V., Murozuka, T., Okada, Y., Pedada, L., Lou, A., Pisani, G., Gentili, A., Stoltz, M., Thomas, I., Mathy, E., Weimar, T., Yu, M.-Y., Shen, L.M., Mason, B., York, D., and Zhang, H.

Abstract

BACKGROUND AND OBJECTIVES: A collaborative study, involving 26 laboratories from 14 countries, was carried out in order to establish a World Health Organization (WHO) International Standard for human parvovirus B19 (B19) DNA nucleic acid amplification techniques (NAT). MATERIALS AND METHODS: Four samples: AA, BB (which were lyophilized), CC and DD (which were liquid preparations) were analysed using several different NAT assays. The mean B19 DNA content of each sample was determined for each laboratory using an end-point dilution method. RESULTS: There was good agreement between the overall mean 'equivalents'/ml obtained by the different assays. The mean log(10) 'equivalents'/ml were 5.76 for sample AA, 5.73 for sample BB, 5.82 for sample CC and 7.70 for sample DD. The differences in titre among samples AA, BB and CC were not statistically significant, but the titre of DD was significantly higher. CONCLUSIONS: Despite the range of NAT assays used in the study, it was possible to calculate the mean B19 DNA concentrations in the four preparations. Lyophilized preparation AA was established as the first International Standard for B19 DNA NAT assays and was assigned a concentration of 10(6) international units (IU)/ml.

Published
2002

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