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789 results on '"Wu, M. -S"'

1. Possibility of forming a stable Bose-Einstein condensate of $2\,^{3}\!S_1$ positronium atoms

Author

Zhang, Y., Wu, M. -S., Zhang, J. -Y., Qian, Y., Gao, X., and Varga, K.

Subjects
Physics - Atomic Physics
Abstract

The confined variational method in conjunction with the orthogonalizing pseudo-potential method and the stabilization method is used to study the low energy elastic scattering between two spin-polarized metastable positronium Ps(2\,$^{3}\!S_1$) atoms. Explicitly correlated Gaussian basis functions are adopted to properly describe the complicated Coulomb interaction among the four charged particles. The calculated $s$-wave scattering length ($\approx8.5\,a_0$) is positive, indicating the possibility of forming a stable Bose-Einstein condensate of fully spin-polarized $\text{Ps}(2\,^{3}\!S_1)$ atoms. Our results will open a new way of experimental realization of Ps condensate and development of $\gamma$-ray and $\text{Ps}(2\,^{3}\!S_1)$ atom lasers., Comment: 6 pages, 1 figure

Published
2019

2. S-wave elastic scattering of ${\it o}$-Ps from $\text{H}_2$ at low energy

Author

Zhang, J. -Y., Wu, M. -S., Qian, Y., Gao, X., Yang, Y. -J., Varga, K., Yan, Z. -C., and Schwingenschlögl, U.

Subjects
Physics - Atomic Physics
Abstract

The confined variational method is applied to investigate the low-energy elastic scattering of ortho-positronium from $\text{H}_2$ by first-principles quantum mechanics. Describing the correlation effect with explicitly correlated Gaussians, we obtain accurate $S$-wave phase shifts and pick-off annihilation parameters for different incident momenta. By a least-squares fit of the data to the effective-range theory, we determine the $S$-wave scattering length, $A_s=2.06a_0$, and the zero-energy value of the pick-off annihilation parameter, $^1\!\text{Z}_\text{eff}=0.1858$. The obtained $^1\!\text{Z}_\text{eff}$ agrees well with the precise experimental value of $0.186(1)$ (J.\ Phys.\ B \textbf{16}, 4065 (1983)) and the obtained $A_s$ agrees well with the value of $2.1(2)a_0$ estimated from the average experimental momentum-transfer cross section for Ps energy below 0.3 eV (J.\ Phys.\ B \textbf{36}, 4191 (2003))., Comment: 5 pages

Published
2018
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3. Safety, tolerability, viral kinetics, and immune correlates of protection in healthy, seropositive UK adults inoculated with SARS-CoV-2: a single-centre, open-label, phase 1 controlled human infection study.

Author

Jackson, S, Marshall, JL, Mawer, A, Lopez-Ramon, R, Harris, SA, Satti, I, Hughes, E, Preston-Jones, H, Cabrera Puig, I, Longet, S, Tipton, T, Laidlaw, S, Doherty, RP, Morrison, H, Mitchell, R, Tanner, R, Ateere, A, Stylianou, E, Wu, M-S, Fredsgaard-Jones, TPW, Breuer, J, Rapeport, G, Ferreira, VM, Gleeson, F, Pollard, AJ, Carroll, M, Catchpole, A, Chiu, C, McShane, H, COV-CHIM01 study team, Jackson, S, Marshall, JL, Mawer, A, Lopez-Ramon, R, Harris, SA, Satti, I, Hughes, E, Preston-Jones, H, Cabrera Puig, I, Longet, S, Tipton, T, Laidlaw, S, Doherty, RP, Morrison, H, Mitchell, R, Tanner, R, Ateere, A, Stylianou, E, Wu, M-S, Fredsgaard-Jones, TPW, Breuer, J, Rapeport, G, Ferreira, VM, Gleeson, F, Pollard, AJ, Carroll, M, Catchpole, A, Chiu, C, McShane, H, and COV-CHIM01 study team

Abstract

BACKGROUND: A SARS-CoV-2 controlled human infection model (CHIM) has been successfully established in seronegative individuals using a dose of 1×101 50% tissue culture infectious dose (TCID50) pre-alpha SARS-CoV-2 virus. Given the increasing prevalence of seropositivity to SARS-CoV-2, a CHIM that could be used for vaccine development will need to induce infection in those with pre-existing immunity. Our aim was to find a dose of pre-alpha SARS-CoV-2 virus that induced infection in previously infected individuals. METHODS: Healthy, UK volunteers aged 18-30 years, with proven (quantitative RT-PCR or lateral flow antigen test) previous SARS-CoV-2 infection (with or without vaccination) were inoculated intranasally in a stepwise dose escalation CHIM with either 1×101, 1×102, 1×10³, 1×104, or 1×105 TCID50 SARS-CoV-2/human/GBR/484861/2020, the same virus used in the seronegative CHIM. Post-inoculation, volunteers were quarantined in functionally negative pressure rooms (Oxford, UK) for 14 days and until 12-hourly combined oropharyngeal-nasal swabs were negative for viable virus by focus-forming assay. Outpatient follow-up continued for 12 months post-enrolment, with additional visits for those who developed community-acquired SARS-CoV-2 infection. The primary objective was to identify a safe, well tolerated dose that induced infection (defined as two consecutive SARS-CoV-2 positive PCRs starting 24 h after inoculation) in 50% of seropositive volunteers. This study is registered with ClinicalTrials.gov (NCT04864548); enrolment and follow-up to 12 months post-enrolment are complete. FINDINGS: Recruitment commenced on May 6, 2021, with the last volunteer enrolled into the dose escalation cohort on Nov 24, 2022. 36 volunteers were enrolled, with four to eight volunteers inoculated in each dosing group from 1×101 to 1×105 TCID50 SARS-CoV-2. All volunteers have completed quarantine, with follow-up to 12 months complete. Despite dose escalation to 1×105 TCID50, we were unable to

Published
2024

4. Is silicene stable in air? -- First principles study of oxygen adsorption and dissociation on silicene

Author

Liu, G., Lei, X. L., Wu, M. S., Xu, B., and OuYang, C. Y.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

The oxygen adsorption and dissociation on pristine silicene surface are studied by use of first-principles in this letter. The oxygen adsorption and dissociation on pristine silicene surface are studied by use of first-principles in this letter. It is found that the pristine silicene is not stable in air because the oxygen molecule can be easily adsorbed and dissociated into two O atoms without overcoming any energy barrier on pristine silicene surface. In addition, dissociated oxygen atoms are relatively difficult to migrate on or desorbed from pristine silicene surface, leading to poor mobility of oxygen atom. As a result, silicene would be changed into Si-O compounds in air. The work will be helpful to reveal the detail of the interaction between oxygen molecules and pristine silicene surface, especially helpful to understand the stability of silicene in air.

Published
2013

9. Long-range interactions of the ground state muonium with atoms.

Author

Yang, H., Wu, M.-S., Tang, L.-Y., Bromley, M. W. J., Varga, K., Yan, Z.-C., and Zhang, J.-Y.

Subjects
*ALKALINE earth metals, *ALKALI metals, *ATOMS, *DISPERSION relations, *NOBLE gases, *DISPERSION (Chemistry)
Abstract

The scaling relations for the dispersion coefficients of long-range interactions between the Mu(1s)–Mu(1s, 2s, or 2p) systems and the H(1s)–H(1s, 2s, or 2p) systems are obtained using analytical properties of hydrogenic wavefunctions, which allows us to obtain the dispersion coefficients for Mu(1s)–Mu(1s, 2s, or 2p) systems from the corresponding H(1s)–H(1s, 2s, or 2p) systems. Additionally, the dispersion coefficients of long-range interactions of Mu(1s) with the ground-state H, noble gas atoms He, Ne, Ar, Kr, and Xe, alkali-metal atoms Li, Na, K, and Rb, alkaline-earth atoms Be, Mg, Ca, and Sr, and Cu, Ag, F, and Cl atoms are calculated. [ABSTRACT FROM AUTHOR]

Published
2020
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33. Abstracts of presentations on selected topics at the XIVth international plant protection congress (IPPC) July 25–30, 1999

Author

Hull, R., Kuiper, H. A., Noordam, Maryvon Y., Hoy, Marjorie A., Cory, Jenny S., Fereres, A. C., Gonzalez, P., Meins, F., Elkind, Y., Charrier, Benedicte, Meyer, P., Metzlaff, M., Schuch, W., Ikin, R., Parnell, T., Frison, E. A., Spiegel, S., Diekmann, Marlene, Ausher, R., Hollingworth, R. M., Holm, Robert E., Ragsdale, N. N., Federici, B. A., Vlak, J. M., Chejanovsky, N., Bianchi, F. J. J. A., Joosten, Nina N., Gutierrez, Serafin, van der Wert, W., Regev, A., Inceoglu, B., Reske, G., Gershburg, E., Rivkin, H., Zilberberg, N., Froy, O., Gurevitz, M., Hammock, B. D., Llobell, A., Monte, E., González-Candelas, L., Dealessi, Laura, Camponogara, Andrea, Ramón-Vidal, D., Migheli, Q., Chernin, L., Zhou, L., Ovadis, M., Ismailov, Z., Chet, I., Teng, P. S., Mohankumar, S., Renganayaki, K., Nagarajan, P., Balasaraswathi, R., Shanmugasundaram, P., Reddy, Avutu Sam, Sadasivam, S., Thottappilly, G., Ng, S. Y. C., Winter, S., Shvidchenko, V., Manadilova, A., Sadvakasova, G., Sozinova, L. F., Levy, D., Loebenstein, G., Khadi, B. M., Kulkarni, V. N., Khadi, B. M., Kulkarni, V. N., Patil, S. B., Freyssinet, G., Kaufmann, J. E., Owen, M. D. K., Dolgov, S. V., Rotteveel, A. J. W., Gressel, J., Tzotzos, G., Ammann, K., Jacot, Yolande, Raybould, A. F., Gray, A. J., Maskell, L. C., Cooper, J. I., Edwards, M. E., Pallet, D., Williams, D., Smith, M., Aldwinckle, H. S., Norelli, J. L., Bolar, J. P., Harman, G. E., Martini, N., Porsch, Petra, Mahn, A., Bulow, L., Brinkmann, O., Giet’t’ers, W., During, K., Dahan, Aviva, Fahima, T., Nevo, E., Dickman, M. B., Gonsalves, D., Cheng, Z. M., Wu, M. S., He, X. Y., Chen, C. C., Zhang, J., Gafni, Y., Daly, J. C., Fitt, G. P., Olsen, K., Mares, C. L., Moran, R., Garcia, R., Mena, J., Zaldua, Zurima, Garcia, Melba, Lopez, Alina, Somonte, Danalay, Alvarez, Irene, de la Riva, G., Selman, G., Shomer-Ilan, Adiva, Walsh, J. A., Jenner, Carol E., Rusholme, Rachel L., Hughes, Sara L., Sanchez, Flora, Ponz, F., Lydiate, D. J., Röder, Marion S., Peng, Jun-Hua, Grama, Adriana, Korol, A., Paran, I., Zamir, D., van der Voort, J. Rouppe, van Eck, H., van Koert, P., van Os, H., Buntjer, J., Visser, R., Stiekema, W., Bakker, J., Lankhorst, R. Klein, van der Vossen, E., Kanyuka, K., Bendahmane, A., Monk, Kathy S., Tomerlin, J. R., Petersen, B. J., Leonard, P., Smith, I. M., Shaner, D. I., Delbridge, T. G., Levy, Edna, Kovanci, O. B., Kovanci, B., Salpiggidis, G. C., Navrozidis, E. I., Zartaloudis, Z. D., El-Shemy, Hamied, Di Primo, P., Cartia, G., Rahman, Mohamed Abdul, Lopez-Martinez, Nuria, De Prado, R., El-Nahhal, Y., Safi, J., Polubesova, Tamara, Levi, Avishag, Margulies, L., Rubin, B., and Undabeytia, T.

Published
1999
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