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168 results on '"Duan, X.F."'

1. A search for fast radio bursts associated with gamma-ray bursts using the YNAO 40-m radio telescope

Author

Zhang Y.F., Wen Z.G., Wang N., Hao L.F., Yuan J.P., Yuen R., Duan X.F., and Wang Z.

Subjects
radio continuum: general, gamma-ray burst: general, methods: observational, methods: data analysis, Astronomy, QB1-991
Abstract

We report on the search results of Fast Radio Bursts (FRBs) from three Gamma- ray Bursts (GRBs) at 2256 MHz using the 40-m radio telescope located at the YunNan Astronomical Observatory (YNAO). The search for signals was triggered by the Burst Alert Telescope (BAT) on- board the Swift satellite. Radio single pulses are searched in the data over a large range of dispersion measure from 0 to 5000 pc/cm3 in step of 50 pc/cm3. No FRB-like emission from the prompt phase of GRBs are detected with significance > 5σ. If there are FRBs related to the GRBs, we set an upper limit on the ux density of radio pulses of 2.5 Jy for GRB140512A and 8.0 Jy for GRBs 140629A and 140703A with the sensitivity of the telescope. A statistical analysis of the GRB data reveals that the events detected above 5σ are consistent with the thermal noise uctuations.

Published
2023
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16. World Health Organization cardiovascular disease risk charts: revised models to estimate risk in 21 global regions

Author

Angelantonio, E. di, Kaptoge, S., Pennells, L., Bacquer, D. de, Cooney, M.T., Kavousi, M., Stevens, G., Riley, L., Savin, S., Altay, S., Amouyel, P., Assmann, G., Bell, S., Ben-Shlomo, Y., Berkman, L., Beulens, J.W., Bjorkelund, C., Blaha, M.J., Blazer, D.G., Bolton, T., Bonita, R., Brenner, B.H., Brunner, E.J., Casiglia, E., Chamnan, P., Choi, Y.H., Chowdhury, R., Coady, S., Crespo, C.J., Cushman, M., Dagenais, G.R., D'Agostino, R.B., Daimon, M., Davidson, K.W., Engstrom, G., Fang, X.H., Ford, I., Gallacher, J., Gansevoort, R.T., Gaziano, T.A., Giampaoli, S., Grandits, G., Grimsgaard, S., Grobbee, D.E., Gudnason, V., Guo, Q., Humphries, S., Iso, H., Jukema, J.W., Kauhanen, J., Kengne, A.P., Khalili, D., Khan, T., Knuiman, M., Koenig, W., Kromhout, D., Krumholz, H.M., Lam, T.H., Laughlin, G., Ibanez, A.M., Moons, K.G.M., Nietert, P.J., Ninomiya, T., Nordestgaard, B.G., O'Donnell, C., Palmieri, L., Patel, A., Perel, P., Price, J.F., Costa, R.B.D.E., Ridker, P.M., Rodriguez, B., Rosengren, A., Roussel, R., Sakurai, M., Salomaa, V., Sato, S., Schottker, B., Shara, N., Shaw, J.E., Shin, H.C., Simons, L.A., Sofianopoulou, E., Sundstrom, J., Tolonen, H., Ueshima, H., Volzke, H., Wallace, R.B., Wareham, N.J., Willeit, P., Wood, D., Wood, A., Zhao, D., Onuma, O., Woodward, M., Danaei, G., Roth, G., Mendis, S., Graham, I., Varghese, C., Ezzati, M., Jackson, R., Danesh, J., Nambi, V., Matsushita, K., Couper, D., Diabetes, A., Zimmet, P.Z., Barr, E.L.M., Atkins, R., Whincup, P.H., Study, B., Kiechl, S., Willeit, J., Rungger, G., Sofat, R., Dale, C., Casas, J.P., Tikhonoff, V., Hunt, K.J., Sutherland, S.E., Psaty, B.M., Tracy, R., Frikke-Schmidt, R., Jensen, G.B., Schnohr, P., Donfrancesco, C., Vanuzzo, D., Panico, S., Balkau, B., Bonnet, F., Fumeron, F., Simons, J., McLachlan, S., Guralnik, J., Khaw, K.T., Brenner, H., Zhang, Y., Holleczek, B., Cohort, F., Vartiainen, E., Jousilahti, P., Harald, K., Massaro, J.J., Pencina, M., Ramachandran, V., Susa, S., Oizumi, T., Kayama, T., Wilhelmsen, L., Lissner, L., Hange, D., Mehlig, K., Hata, J., Yoshida, D., Hirakawa, Y., Rutters, F., Elders, P.J.M., Kyowa, I., Kiyama, M., Yamagishi, K., Tuomainen, T.P., Virtanen, J., Salonen, J.T., Meade, T.W., Nilsson, P.M., Melander, O., Boer, I.H. de, DeFilippis, A.P., Kuller, L.H., Juan, S.I., Gillum, R.F., Kirkland, S., Shimbo, D., Schwartz, J.E., Imano, H., Harst, P. van der, Hillige, J.L., Bakker, S.J., Dallongeville, J., Ferrieres, J., Moitry, M., Stott, D.J., Despres, J.P., Laughlin, G.A., Daniels, L.B., McEvoy, L.K., Aspelund, T., Thorsson, B., Gudmundsson, E.F., Aribas, E., Rueda-Ochoa, O.L., Ikram, M.K., Heshmatollah, A., Ikram, M.A., Dorr, M., Nauck, M., Howard, B., Can, G., Ishizaki, M., Wilsgaard, T., Mathiesen, E., Giedraitis, V., Ingelsson, M., Cook, N., Buring, J., Schouw, Y.T. van der, Claessen, H., Rothenbacher, D., Arndt, V., Study, W.I., Shipley, M., Packard, C., Robertson, M., Young, R., Feskens, E., Geleijnse, J.M., Fang, X., Gu, D.F., Huxley, R., Imai, Y., Kim, H.C., Pan, W.H., Rodgers, A., Suh, I., Town, A., Okayama, A., Maegawa, H., Nakamura, M., Aoki, N., Wu, Z.S., Yao, C.H., Luszcz, M., Tang, Z., Liu, L.S., Xie, J.X., Norton, R., Ameratunga, S., MacMahon, S., Whitlock, G., Knuiman, M.W., Christensen, H., Wu, X.G., Zhou, J., Yu, X.H., Tamakoshi, W.A., Wu, Z.L., Chen, L.Q., Shan, G.L., Sritara, P., Duan, X.F., Li, Y.H., Jiang, C.Q., Woo, J., Ho, S.C., Hong, Z., Huang, M.S., Zhou, B., Fuh, J.L., Kita, Y., Choudhury, S.R., Jee, S.H., Kim, Woodward, M, Cardiovascular Centre (CVC), Groningen Kidney Center (GKC), Groningen Institute for Organ Transplantation (GIOT), Lifestyle Medicine (LM), Epidemiology, Epidemiology and Data Science, ACS - Diabetes & metabolism, ACS - Heart failure & arrhythmias, and APH - Health Behaviors & Chronic Diseases

Subjects
Male, 10-YEAR RISK, BLOOD-PRESSURE, 0302 clinical medicine, Risk Factors, Medicine and Health Sciences, Medicine, Uganda, Cardiac and Cardiovascular Systems, Prospective Studies, 030212 general & internal medicine, Aged, 80 and over, Medicine(all), Kardiologi, lcsh:Public aspects of medicine, PRIMARY-CARE, Public Health, Global Health, Social Medicine and Epidemiology, General Medicine, Middle Aged, 3. Good health, Pooled analysis, Cardiovascular Diseases, Egypt, Female, Adult, PROSPECTIVE COHORTS, 030231 tropical medicine, 195 COUNTRIES, Primary care, World Health Organization, Risk Assessment, Article, World health, POOLED ANALYSIS, 03 medical and health sciences, SDG 3 - Good Health and Well-being, Primary prevention, Environmental health, SYSTEMATIC ANALYSIS, Humans, Aged, CHINESE POPULATION, Chinese population, business.industry, Individual participant data, lcsh:RA1-1270, R1, Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi, Disease risk, business, INDIVIDUAL PARTICIPANT DATA, PRIMARY PREVENTION
Abstract

Background: To help adapt cardiovascular disease risk prediction approaches to low-income and middle-income countries, WHO has convened an effort to develop, evaluate, and illustrate revised risk models. Here, we report the derivation, validation, and illustration of the revised WHO cardiovascular disease risk prediction charts that have been adapted to the circumstances of 21 global regions. Methods: In this model revision initiative, we derived 10-year risk prediction models for fatal and non-fatal cardiovascular disease (ie, myocardial infarction and stroke) using individual participant data from the Emerging Risk Factors Collaboration. Models included information on age, smoking status, systolic blood pressure, history of diabetes, and total cholesterol. For derivation, we included participants aged 40–80 years without a known baseline history of cardiovascular disease, who were followed up until the first myocardial infarction, fatal coronary heart disease, or stroke event. We recalibrated models using age-specific and sex-specific incidences and risk factor values available from 21 global regions. For external validation, we analysed individual participant data from studies distinct from those used in model derivation. We illustrated models by analysing data on a further 123 743 individuals from surveys in 79 countries collected with the WHO STEPwise Approach to Surveillance. Findings: Our risk model derivation involved 376 177 individuals from 85 cohorts, and 19 333 incident cardiovascular events recorded during 10 years of follow-up. The derived risk prediction models discriminated well in external validation cohorts (19 cohorts, 1 096 061 individuals, 25 950 cardiovascular disease events), with Harrell's C indices ranging from 0·685 (95% CI 0·629–0·741) to 0·833 (0·783–0·882). For a given risk factor profile, we found substantial variation across global regions in the estimated 10-year predicted risk. For example, estimated cardiovascular disease risk for a 60-year-old male smoker without diabetes and with systolic blood pressure of 140 mm Hg and total cholesterol of 5 mmol/L ranged from 11% in Andean Latin America to 30% in central Asia. When applied to data from 79 countries (mostly low-income and middle-income countries), the proportion of individuals aged 40–64 years estimated to be at greater than 20% risk ranged from less than 1% in Uganda to more than 16% in Egypt. Interpretation: We have derived, calibrated, and validated new WHO risk prediction models to estimate cardiovascular disease risk in 21 Global Burden of Disease regions. The widespread use of these models could enhance the accuracy, practicability, and sustainability of efforts to reduce the burden of cardiovascular disease worldwide. Funding: World Health Organization, British Heart Foundation (BHF), BHF Cambridge Centre for Research Excellence, UK Medical Research Council, and National Institute for Health Research. The WHO CVD Risk Chart Working Group, for complete list of authors see http://dx.doi.org/10.1016/S2214-109X(19)30318-3

Published
2019
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20. Diffraction characterization of totally relaxed, partially relaxed, and unrelaxed semiconductor strained-layer superlattices

Author

Duan, X.F. and Fung, K.K.

Subjects
Strains and stresses -- Research, Semiconductors -- Research, Superlattices as materials -- Research, Physics
Abstract

Diffraction originating from totally relaxed, partially relaxed and unrelaxed semiconductor strained-layer superlattices was investigated using convergent-beam electron diffraction and x-ray diffraction. The results showed that the intensity profile of the superlattice was dependent on the difference of the tensile and compressive strains. The oscillating strain of the superlattice bilayer was not dependent on the strain.

Published
1992

32. A transmission electron microscopy study of microstructural defects in proton implanted silicon

Author

Gao, Min, Duan, X.F., Li, Jianming, and Wang, Fenglian

Subjects
Silicon-on-isolator -- Research, Microstructure -- Research, Physics
Abstract

Transmission electron microscopy experiments were performed to examine the presence of microstructural defects in silicon-on-defect layer prepared by proton implantation and two-step annealing. The structures, which contain a highly-resistive layer below the silicon surface, were found to possess heavily damaged sites of high hydrogen concentration containing (001) and (111) platelets due to implantation.

Published
1996

33. Metabolic mediators of the effects of body-mass index, overweight, and obesity on coronary heart disease and stroke: A pooled analysis of 97 prospective cohorts with 1·8 million participants

Author

Lu, Y. Hajifathalian, K. Ezzati, M. Woodward, M. Rimm, E.B. Danaei, G. Selmer, R. Strand, B.H. Dobson, A. Hozawa, A. Nozaki, A. Okayama, A. Rodgers, A. Tamakoshi, A. Zhou, B.F. Zhou, B. Yao, C.H. Jiang, C.Q. Gu, D.F. Heng, D. Giles, G.G. Shan, G.L. Whitlock, G. Arima, H. Kim, H.C. Christensen, H. Horibe, H. Maegawa, H. Tanaka, H. Ueshima, H. Zhang, H.Y. Kim, I.S. Suh, I. Fuh, J.L. Lee, J. Woo, J. Xie, J.X. Zhou, J. Hughes, K. Jamrozik, K. Nakachi, K. Sakata, K. Shimamoto, K. Chen, L.Q. Liu, L.S. Hobbs, M. Iida, M. Kagaya, M. Divitini, M.L. Luszcz, M. Nakamura, M. Huang, M.S. Knuiman, M.W. Aoki, N. Norman, P. Sritara, P. Yang, Q.D. Broadhurst, R. Huxley, R. Jackson, R. Norton, R. Ameratunga, S. Ho, S.C. Li, S.C. Jee, S.H. Chew, S.K. Macmahon, S. Choudhury, S.R. Saitoh, S. Yao, S.X. Welborn, T.A. Lam, T.H. Hashimoto, T. Ohkubo, T. Pan, W.-H. Duan, X.F. Fang, X. Wu, X.G. Fang, X.H. Yu, X.H. Li, Y.H. He, Y. Imai, Y. Kita, Y. Kiyohara, Y. Matsutani, Y. Hong, Z. Wu, Z.L. Chen, Z.M. Wu, Z.S. Tang, Z. Li, Z.Z. Parker, E.D. Pereira, M.A. Stevens, J. Panagiotakos, D.B. Pitsavos, C. Attia, J.R. D’este, C.A. Zhang, X. Clays, E. De Bacquer, D.A.O. Van Herck, K. Morrison, H.I. Wang, F. Chuang, S.-Y. Yeh, W.-T. Chen, Z. Smith, M.C. Zhou, M. Wang, W. Zhang, X.-T. Zhao, D. Vollset, S.E. Fuchs, S.C. Fuchs, F.D. Moreira, L.B. Dontas, I.A. Dontas, C.A. Kafatos, A.G. Moschandreas, J. Lanti, M. Menotti, A. Kromhout, D. Jensen, M.K. Overvad, K. Tjonneland, A. Klotsche, J. Wittchen, H.-U. Fischer, S. Hanefeld, M. Schwanebeck, U. Simons, L.A. Simons, J. Bender, R. Matthies, S. Nissinen, A. Tolonen, H.K. Tuomilehto, J. Chaturvedi, N. Fuller, J.H. Soedamah-Muthu, S.S. Kotseva, K. Wood, D.A. Bots, M.L. Moons, K.G.M. Heliovaara, M. Knekt, P.B. Rissanen, H. Ferrie, J.E. Shipley, M.J. Smith, G.D. Johansson, S. Lappas, G. Rosengren, A. Sham, A. Yu, R.H.Y. Hata, J. Ninomiya, T. Hoshide, S. Kario, K. Rastenyte, D. Tamosiunas, A. de Simone, G. Devereux, R.B. Gerdts, E. Colquhoun, D.M. Keech, A.C. Kirby, A.C. Mizuno, K. Nakamura, H. Uchiyama, S. Bassett, J.K. Hodge, A.M. Wilhelmsen, L. Dhaliwal, S.S. Nakamura, Y. Kadota, A. Okamura, T. Sandvei, M.S. Vatten, L.J. Vik, A. Morkedal, B. Romundstad, P.R. Elkind, M.S.V. Gardener, H. Sacco, R.L. Mignano, A. Novo, S. Rizzo, M. Assmann, G. Schulte, H. Lissner, L. Skoog, I. Sundh, V. Marin, A. Medrano, M.J. Hofman, A. Kuningas, M. Stricker, B.H. van der Graaf, Y. Visseren, F.L.J. Lee, J.J.M. Bemelmans, W. de Groot, L.C.P.G.M. de Hollander, E.L. Adachi, H. Hirai, Y. Azizi, F. Hadaegh, F. Khalili, D. Mathiesen, E.B. Njolstad, I. Wilsgaard, T. Can, G. Onat, A. Arnlov, J. Sundstrom, J. Blackburn, H.W. Jacobs, D.R. Averna, M.R. Cefalu, A.B. Noto, D. Concin, H. Nagel, G. Ulmer, H. Krasnow, R.E. Swan, G.E. Kivimaki, M. David Batty, G. Milic, N. Ostojic, M.C. Parapid, B. Geleijnse, J.M. Waterham, E. Feskens, E.J. The Global Burden of Metabolic Risk Factors for Chronic Diseases Collaboration (BMI Mediated Effects)

Abstract

Background Body-mass index (BMI) and diabetes have increased worldwide, whereas global average blood pressure and cholesterol have decreased or remained unchanged in the past three decades. We quantified how much of the effects of BMI on coronary heart disease and stroke are mediated through blood pressure, cholesterol, and glucose, and how much is independent of these factors. Methods We pooled data from 97 prospective cohort studies that collectively enrolled 1·8 million participants between 1948 and 2005, and that included 57 161 coronary heart disease and 31 093 stroke events. For each cohort we excluded participants who were younger than 18 years, had a BMI of lower than 20 kg/m2, or who had a history of coronary heart disease or stroke. We estimated the hazard ratio (HR) of BMI on coronary heart disease and stroke with and without adjustment for all possible combinations of blood pressure, cholesterol, and glucose. We pooled HRs with a random-effects model and calculated the attenuation of excess risk after adjustment for mediators. Findings The HR for each 5 kg/m2 higher BMI was 1·27 (95% CI 1·23-1·31) for coronary heart disease and 1·18 (1·14-1·22) for stroke after adjustment for confounders. Additional adjustment for the three metabolic risk factors reduced the HRs to 1·15 (1·12-1·18) for coronary heart disease and 1·04 (1·01-1·08) for stroke, suggesting that 46% (95% CI 42-50) of the excess risk of BMI for coronary heart disease and 76% (65-91) for stroke is mediated by these factors. Blood pressure was the most important mediator, accounting for 31% (28-35) of the excess risk for coronary heart disease and 65% (56-75) for stroke. The percentage excess risks mediated by these three mediators did not differ significantly between Asian and western cohorts (North America, western Europe, Australia, and New Zealand). Both overweight (BMI ≥25 to

Published
2014

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