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837 results on '"Ye, Tingting"'

8. Global, regional, and national burden of heatwave-related mortality from 1990 to 2019: A three-stage modelling study

Author

Zhao, Qi, Li, Shanshan, Ye, Tingting, Wu, Yao, Gasparrini, Antonio, Tong, Shilu, Urban, Ales, Vicedo-Cabrera, Ana Maria, Tobias, Aurelio, Armstrong, Ben, Royé, Dominic, Lavigne, Eric, de'Donato, Francesca, Sera, Francesco, Kan, Haidong, Schwartz, Joel, Pascal, Mathilde, Ryti, Niilo, Goodman, Patrick, Saldiva, Paulo Hilario Nascimento, Bell, Michelle L., and Guo, Yuming

Subjects
Medical research, Medicine, Experimental, Mortality -- Environmental aspects -- China, Hot weather -- Health aspects -- Models, Biological sciences
Abstract

Background The regional disparity of heatwave-related mortality over a long period has not been sufficiently assessed across the globe, impeding the localisation of adaptation planning and risk management towards climate change. We quantified the global mortality burden associated with heatwaves at a spatial resolution of 0.5°x0.5° and the temporal change from 1990 to 2019. Methods and findings We collected data on daily deaths and temperature from 750 locations of 43 countries or regions, and 5 meta-predictors in 0.5°x0.5° resolution across the world. Heatwaves were defined as location-specific daily mean temperature [greater than or equal to]95th percentiles of year-round temperature range with duration [greater than or equal to]2 days. We first estimated the location-specific heatwave-mortality association. Secondly, a multivariate meta-regression was fitted between location-specific associations and 5 meta-predictors, which was in the third stage used with grid cell-specific meta-predictors to predict grid cell-specific association. Heatwave-related excess deaths were calculated for each grid and aggregated. During 1990 to 2019, 0.94% (95% CI: 0.68-1.19) of deaths [i.e., 153,078 cases (95% eCI: 109,950-194,227)] per warm season were estimated to be from heatwaves, accounting for 236 (95% eCI: 170-300) deaths per 10 million residents. The ratio between heatwave-related excess deaths and all premature deaths per warm season remained relatively unchanged over the 30 years, while the number of heatwave-related excess deaths per 10 million residents per warm season declined by 7.2% per decade in comparison to the 30-year average. Locations with the highest heatwave-related death ratio and rate were in Southern and Eastern Europe or areas had polar and alpine climates, and/or their residents had high incomes. The temporal change of heatwave-related mortality burden showed geographic disparities, such that locations with tropical climate or low incomes were observed with the greatest decline. The main limitation of this study was the lack of data from certain regions, e.g., Arabian Peninsula and South Asia. Conclusions Heatwaves were associated with substantial mortality burden that varied spatiotemporally over the globe in the past 30 years. The findings indicate the potential benefit of governmental actions to enhance health sector adaptation and resilience, accounting for inequalities across communities., Author(s): Qi Zhao 1,2, Shanshan Li 2,*, Tingting Ye 2, Yao Wu 2, Antonio Gasparrini 3, Shilu Tong 4,5, Ales Urban 6,7, Ana Maria Vicedo-Cabrera 8,9, Aurelio Tobias 10, Ben [...]

Published
2024
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14. Photochemical Synthesis of P-S-H Ternary Hydride at High Pressures

Author

Ye, Tingting, Zeng, Hong, Cheng, Peng, Yao, Deyuan, Pan, Xiaomei, Zhang, Xiao, and Ding, Junfeng

Subjects
Condensed Matter - Materials Science, Condensed Matter - Superconductivity
Abstract

The recent discovery of room temperature superconductivity (283 K) in carbonaceous sulfur hydride (C-S-H) has attracted lots of interests in ternary hydrogen rich materials. In this report, ternary hydride P-S-H has been synthesized through photochemical reaction from elemental sulfur (S), phosphorus (P) and molecular hydrogen (H2) at high pressures and room temperature. The Raman spectroscopy under pressure shows that H2S and PH3 compounds are synthesized after laser heating at 0.9 GPa and a ternary van der Waals compound P-S-H is synthesized with a further compression to 4.6 GPa. The P-S-H compound is probably a mixed alloy of PH3 and (H2S)2H2 with a guest-host structure similar to the C-S-H system. The ternary hydride can persist up to 35.6 GPa at least and shows two phase transitions at approximately 23.6 GPa and 32.8 GPa, respectively. The P-S-H ternary hydride in this report is a competitive candidate for new hydride superconductors with near room-temperature transitions.

Published
2021
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30. Asset Allocation via Machine Learning and Applications to Equity Portfolio Management

Author

Yang, Qing, Hong, Zhenning, Tian, Ruyan, Ye, Tingting, and Zhang, Liangliang

Subjects
Quantitative Finance - Mathematical Finance, Quantitative Finance - Portfolio Management
Abstract

In this paper, we document a novel machine learning based bottom-up approach for static and dynamic portfolio optimization on, potentially, a large number of assets. The methodology applies to general constrained optimization problems and overcomes many major difficulties arising in current optimization schemes. Taking mean-variance optimization as an example, we no longer need to compute the covariance matrix and its inverse, therefore the method is immune from the estimation error on this quantity. Moreover, no explicit calls of optimization routines are needed. Applications to equity portfolio management in U.S. and China equity markets are studied and we document significant excess returns to the selected benchmarks., Comment: 16 pages, 5 figures and 3 tables

Published
2020

38. A Parametric Analysis of the Planes of the Existing Neoclassical Architecture of the Oldest Churches in Macau

Author

Tang Wei, Tang Jian, Huang Gecun, and Ye Tingting

Subjects
Environmental sciences, GE1-350
Abstract

The three oldest churches in Macao are all listed in the UNESCO World Heritage List. The existing buildings of St. Lawrence’s Church and St. Anthony’s Church are both the neoclassical style. There is few parametric analysis of these two churches. This study takes the planes of St. Lawrence’s Church and St. Anthony’s Church as the research objects, and parameterizes the geometric composition characteristics of the designs.

Published
2024
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