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238 results on '"Wang, Qing-Wei"'

1. Plastics in the environment in the context of UV radiation, climate change and the Montreal Protocol: UNEP Environmental Effects Assessment Panel, Update 2023

Author

Jansen, Marcel A. K., Andrady, Anthony L., Bornman, Janet F., Aucamp, Pieter J., Bais, Alkiviadis F., Banaszak, Anastazia T., Barnes, Paul W., Bernhard, Germar H., Bruckman, Laura S., Busquets, Rosa, Häder, Donat-P., Hanson, Mark L., Heikkilä, Anu M., Hylander, Samuel, Lucas, Robyn M., Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J., Neale, Rachel E., Olsen, Catherine M., Ossola, Rachele, Pandey, Krishna K., Petropavlovskikh, Irina, Revell, Laura E., Robinson, Sharon A., Robson, T. Matthew, Rose, Kevin C., Solomon, Keith R., Andersen, Mads P. Sulbæk, Sulzberger, Barbara, Wallington, Timothy J., Wang, Qing-Wei, Wängberg, Sten-Åke, White, Christopher C., Young, Antony R., Zepp, Richard G., and Zhu, Liping

Published
2024
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4. Exact Dynamical Correlations of Hard-Core Anyons in One-Dimensional Lattices

Author

Wang, Qing-Wei

Subjects
Condensed Matter - Quantum Gases, Condensed Matter - Statistical Mechanics, Condensed Matter - Strongly Correlated Electrons
Abstract

The dynamical correlations of a strongly correlated system is an essential ingredient to describe its non-equilibrium properties. We present a general method to calculate exactly the dynamical correlations of hard-core anyons in one-dimensional lattices, valid for any type of confining potential and any temperature. We obtain exact explicit expressions of the Green's function, the spectral function, and the out-of-time-ordered correlators (OTOCs). We find that the anyonic spectral function displays three main singularity lines which can be explained as a double spectrum in analogy to the Lieb-Liniger gas. The dispersion relations of these lines can be given explicitly and they cross at a \emph{hot point} $(q_m,\omega_m)$, which induces a peak in the momentum distribution function at $q_m$ and a power-law singularity in the local spectral function at $\omega_m$. We also find that the anyonic statistics can induces spatial asymmetry in the Green's function, its spectrum, and the OTOC. Moreover, the information spreading characterized by the OTOCs shows light-cone dynamics, asymmetric for general statistics and low temperatures, but symmetric at infinite temperature. Our results pave the way toward studying the non-equilibrium dynamics of hard-core anyons and experimentally probing anyonic statistics through spectral functions., Comment: 6 figures, accepted by Phys. Rev. B

Published
2022
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5. Exact dynamical correlations of nonlocal operators in quadratic open Fermion systems: a characteristic function approach

Author

Wang, Qing-Wei

Subjects
Quantum Physics
Abstract

The dynamical correlations of nonlocal operators in general quadratic open fermion systems is still a challenging problem. Here we tackle this problem by developing a new formulation of open fermion many-body systems, namely, the characteristic function approach. Illustrating the technique, we analyze a finite Kitaev chain with boundary dissipation and consider anyon-type nonlocal excitations. We give explicit formula for the Green's functions, demonstrating an asymmetric light cone induced by the anyon statistical parameter and an increasing relaxation rate with this parameter. We also analyze some other types of nonlocal operator correlations such as the full counting statistics of the charge number and the Loschmidt echo in a quench from the vacuum state. The former shows clear signature of a nonequilibrium quantum phase transition, while the later exhibits cusps at some critical times and hence demonstrates dynamical quantum phase transitions., Comment: 30 pages,7 figures

Published
2022
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9. Orbital driven two-dome superconducting phases in multiorbital superconductors

Author

Liu, Jing, Wang, Qing-Wei, and Zou, Liang-Jian

Subjects
Condensed Matter - Superconductivity
Abstract

We theoretically study the superconductivity in multiorbital superconductors based on a three-orbital tight-banding model. With appropriate values of the nearest-neighbour exchange $J_{1}^{\alpha \beta}$ and the next-nearest-neighbour exchange $J_{2}^{\alpha \beta}$, we find a two-dome structure in the $T_{c}-n$ phase diagram: one dome in the doping range $n<3.9$ where the superconducting (SC) state is mainly $s_{x^{2} y^{2}}$ component contributed by inter-orbital pairing, the other dome in the doping range $3.9

Published
2021
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13. Environmental plastics in the context of UV radiation, climate change, and the Montreal Protocol

Author

Jansen, Marcel A. K., primary, Andrady, Anthony L., additional, Barnes, Paul W., additional, Busquets, Rosa, additional, Revell, Laura E., additional, Bornman, Janet F., additional, Aucamp, Pieter J., additional, Bais, Alkiviadis F., additional, Banaszak, Anastazia T., additional, Bernhard, Germar H., additional, Bruckman, Laura S., additional, Häder, Donat‐P., additional, Hanson, Mark L., additional, Heikkilä, Anu M., additional, Hylander, Samuel, additional, Lucas, Robyn M., additional, Mackenzie, Roy, additional, Madronich, Sasha, additional, Neale, Patrick J., additional, Neale, Rachel E., additional, Olsen, Catherine M., additional, Ossola, Rachele, additional, Pandey, Krishna K., additional, Petropavlovskikh, Irina, additional, Robinson, Sharon A., additional, Robson, T. Matthew, additional, Rose, Kevin C., additional, Solomon, Keith R., additional, Sulbæk Andersen, Mads P., additional, Sulzberger, Barbara, additional, Wallington, Timothy J., additional, Wang, Qing‐Wei, additional, Wängberg, Sten‐Åke, additional, White, Christopher C., additional, Young, Antony R., additional, Zepp, Richard G., additional, and Zhu, Liping, additional

Published
2024
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15. Comment on 'Exact Classification of Landau-Majorana-Stuckelberg-Zener Resonances by Floquet Determinants'

Author

Wang, Qing-Wei and Liu, Yu-Liang

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

In a recent Letter [S. Ganeshan, E. Barnes, and S. Das Sarma, Phys. Rev. Lett. 111, 130405 (2013)], Ganeshan et al. present a general framework to classify the resonance structure of Landau-Majorana-Stuckelberg-Zener interferometry into three basic categories distinguished by whether these resonances correspond to periodic or nonperiodic quantum evolution. In this Comment, we show that their identification of the real resonances in the regime of small drive amplitude is incorrect.

Published
2016

17. Environmental plastics in the context of UV radiation, climate change, and the Montreal Protocol

Author

Jansen, Marcel A. K., Andrady, Anthony L., Barnes, Paul W., Busquets, Rosa, Revell, Laura E., Bornman, Janet F., Aucamp, Pieter J., Bais, Alkiviadis F., Banaszak, Anastazia T., Bernhard, Germar H., Bruckman, Laura S., Haeder, Donat-P., Hanson, Mark L., Heikkila, Anu M., Hylander, Samuel, Lucas, Robyn M., Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J., Neale, Rachel E., Olsen, Catherine M., Ossola, Rachele, Pandey, Krishna K., Petropavlovskikh, Irina, Robinson, Sharon A., Robson, T. Matthew, Rose, Kevin C., Solomon, Keith R., Andersen, Mads P. Sulbaek, Sulzberger, Barbara, Wallington, Timothy J., Wang, Qing-Wei, Wängberg, Sten-Åke, White, Christopher C., Young, Antony R., Zepp, Richard G., Zhu, Liping, Jansen, Marcel A. K., Andrady, Anthony L., Barnes, Paul W., Busquets, Rosa, Revell, Laura E., Bornman, Janet F., Aucamp, Pieter J., Bais, Alkiviadis F., Banaszak, Anastazia T., Bernhard, Germar H., Bruckman, Laura S., Haeder, Donat-P., Hanson, Mark L., Heikkila, Anu M., Hylander, Samuel, Lucas, Robyn M., Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J., Neale, Rachel E., Olsen, Catherine M., Ossola, Rachele, Pandey, Krishna K., Petropavlovskikh, Irina, Robinson, Sharon A., Robson, T. Matthew, Rose, Kevin C., Solomon, Keith R., Andersen, Mads P. Sulbaek, Sulzberger, Barbara, Wallington, Timothy J., Wang, Qing-Wei, Wängberg, Sten-Åke, White, Christopher C., Young, Antony R., Zepp, Richard G., and Zhu, Liping

Abstract

There are close links between solar UV radiation, climate change, and plastic pollution. UV-driven weathering is a key process leading to the degradation of plastics in the environment but also the formation of potentially harmful plastic fragments such as micro- and nanoplastic particles. Estimates of the environmental persistence of plastic pollution, and the formation of fragments, will need to take in account plastic dispersal around the globe, as well as projected UV radiation levels and climate change factors.image

Published
2024
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18. Environmental plastics in the context of UV radiation, climate change, and the Montreal Protocol

Author

Jansen, Marcel A.K., Andrady, Anthony L., Barnes, Paul W., Busquets, Rosa, Revell, Laura E., Bornman, Janet F., Aucamp, Pieter J., Bais, Alkiviadis F., Banaszak, Anastazia T., Bernhard, Germar H., Bruckman, Laura S., Häder, Donat P., Hanson, Mark L., Heikkilä, Anu M., Hylander, Samuel, Lucas, Robyn M., Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J., Neale, Rachel E., Olsen, Catherine M., Ossola, Rachele, Pandey, Krishna K., Petropavlovskikh, Irina, Robinson, Sharon A., Robson, T. Matthew, Rose, Kevin C., Solomon, Keith R., Sulbæk Andersen, Mads P., Sulzberger, Barbara, Wallington, Timothy J., Wang, Qing Wei, Wängberg, Sten Åke, White, Christopher C., Young, Antony R., Zepp, Richard G., Zhu, Liping, Jansen, Marcel A.K., Andrady, Anthony L., Barnes, Paul W., Busquets, Rosa, Revell, Laura E., Bornman, Janet F., Aucamp, Pieter J., Bais, Alkiviadis F., Banaszak, Anastazia T., Bernhard, Germar H., Bruckman, Laura S., Häder, Donat P., Hanson, Mark L., Heikkilä, Anu M., Hylander, Samuel, Lucas, Robyn M., Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J., Neale, Rachel E., Olsen, Catherine M., Ossola, Rachele, Pandey, Krishna K., Petropavlovskikh, Irina, Robinson, Sharon A., Robson, T. Matthew, Rose, Kevin C., Solomon, Keith R., Sulbæk Andersen, Mads P., Sulzberger, Barbara, Wallington, Timothy J., Wang, Qing Wei, Wängberg, Sten Åke, White, Christopher C., Young, Antony R., Zepp, Richard G., and Zhu, Liping

Abstract

There are close links between solar UV radiation, climate change, and plastic pollution. UV-driven weathering is a key process leading to the degradation of plastics in the environment but also the formation of potentially harmful plastic fragments such as micro- and nanoplastic particles. Estimates of the environmental persistence of plastic pollution, and the formation of fragments, will need to take in account plastic dispersal around the globe, as well as projected UV radiation levels and climate change factors.

Published
2024

19. Plastics in the environment in the context of UV radiation, climate change and the Montreal Protocol:UNEP Environmental Effects Assessment Panel, Update 2023

Author

Jansen, Marcel A.K., Andrady, Anthony L., Bornman, Janet F., Aucamp, Pieter J., Bais, Alkiviadis F., Banaszak, Anastazia T., Barnes, Paul W., Bernhard, Germar H., Bruckman, Laura S., Busquets, Rosa, Häder, Donat P., Hanson, Mark L., Heikkilä, Anu M., Hylander, Samuel, Lucas, Robyn M., Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J., Neale, Rachel E., Olsen, Catherine M., Ossola, Rachele, Pandey, Krishna K., Petropavlovskikh, Irina, Revell, Laura E., Robinson, Sharon A., Robson, T. Matthew, Rose, Kevin C., Solomon, Keith R., Andersen, Mads P.Sulbæk, Sulzberger, Barbara, Wallington, Timothy J., Wang, Qing Wei, Wängberg, Sten Åke, White, Christopher C., Young, Antony R., Zepp, Richard G., Zhu, Liping, Jansen, Marcel A.K., Andrady, Anthony L., Bornman, Janet F., Aucamp, Pieter J., Bais, Alkiviadis F., Banaszak, Anastazia T., Barnes, Paul W., Bernhard, Germar H., Bruckman, Laura S., Busquets, Rosa, Häder, Donat P., Hanson, Mark L., Heikkilä, Anu M., Hylander, Samuel, Lucas, Robyn M., Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J., Neale, Rachel E., Olsen, Catherine M., Ossola, Rachele, Pandey, Krishna K., Petropavlovskikh, Irina, Revell, Laura E., Robinson, Sharon A., Robson, T. Matthew, Rose, Kevin C., Solomon, Keith R., Andersen, Mads P.Sulbæk, Sulzberger, Barbara, Wallington, Timothy J., Wang, Qing Wei, Wängberg, Sten Åke, White, Christopher C., Young, Antony R., Zepp, Richard G., and Zhu, Liping

Abstract

This Assessment Update by the Environmental Effects Assessment Panel (EEAP) of the United Nations Environment Programme (UNEP) considers the interactive effects of solar UV radiation, global warming, and other weathering factors on plastics. The Assessment illustrates the significance of solar UV radiation in decreasing the durability of plastic materials, degradation of plastic debris, formation of micro- and nanoplastic particles and accompanying leaching of potential toxic compounds. Micro- and nanoplastics have been found in all ecosystems, the atmosphere, and in humans. While the potential biological risks are not yet well-established, the widespread and increasing occurrence of plastic pollution is reason for continuing research and monitoring. Plastic debris persists after its intended life in soils, water bodies and the atmosphere as well as in living organisms. To counteract accumulation of plastics in the environment, the lifetime of novel plastics or plastic alternatives should better match the functional life of products, with eventual breakdown releasing harmless substances to the environment.

Published
2024

20. Comment on 'Integrability of the Rabi Model'

Author

Wang, Qing-Wei and Liu, Yu-Liang

Subjects
Quantum Physics, Condensed Matter - Quantum Gases
Abstract

Using Hill's determinant method we show that the set of Judd's solutions is only a subset of all the eigenvalues with the form $E_n=n\omega-g^2/\omega$ in the spectrum of the Rabi model. Therefore Braak's solution of the quantum Rabi model is not complete.

Published
2015

21. Autumn sunlight promotes aboveground carbon loss in a temperate mixed forest.

Author

Li, Xingzhi, Wang, Yanan, Zhang, Juanjuan, Robson, Thomas Matthew, Kurokawa, Hiroko, Peng, Huan, Zhou, Li, Yu, Dapao, Deng, Jiaojiao, and Wang, Qing-Wei

Subjects
FOREST litter, AUTUMN, TEMPERATE forests, MIXED forests, TEMPERATE forest ecology, CLIMATE change
Abstract

Background: Photodegradation of plant litter plays a pivotal role in the global carbon (C) cycle. In temperate forest ecosystems, the exposure of plant litter to solar radiation can be significantly altered by changes in autumn phenology and snow cover due to climatic change. How this will affect litter decomposition and nutrient dynamic interacting with forest canopy structure (understorey vs. gaps) is uncertain. In the present study, we conducted a field experiment using leaf litter of early-fall deciduous Betula platyphylla (Asian white birch) and late-fall deciduous Quercus mongolica (Mongolian oak) to explore the effect of change in autumn solar radiation on dynamics of litter decomposition in a gap and understorey of a temperate mixed forest. Results: Exposure to the full-spectrum of not only significantly increased the loss of mass, C, and lignin, but also modified N loss through both immobilization and mineralization during the initial decomposition during autumn canopy opening, irrespective of canopy structure and litter species. These effects were mainly driven by the blue-green spectral region of sunlight. Short-term photodegradation by autumn solar radiation had a positive legacy effect on the later decomposition particularly in the forest gap, increasing mass loss by 16% and 19% for Asian white birch and Mongolia oak, respectively. Conclusions: Our results suggest that earlier autumn leaf-fall phenology and/or later snow cover due to land-use or climate change would increase the exposure of plant organic matter to solar radiation, and accelerate ecosystem processes, C and nutrient cycling in temperate forest ecosystems. The study provides a reference for predictive research on carbon cycling under the background of global climate change. [ABSTRACT FROM AUTHOR]

Published
2024
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35. United Nations Environment Programme (UNEP), Questions and Answers about the Effects of Ozone Depletion, UV Radiation, and Climate on Humans and the Environment. Supplement of the 2022 Assessment Report of the UNEP Environmental Effects Assessment Panel

Author

Andersen, Mads P. Sulbaek, Andrady, Anthony L, Bais, Alkiviadis F, Barnes, Paul, Bernhard, Germar H, Byrne, Scott N, Heikkila, Anu M, Ireland, Rachael, Jansen, Marcel A. K, Madronich, Sasha, McKenzie, Richard L, Neale, Rachel, Neale, Patrick J, Ossola, Rachele, Wang, Qing-Wei, Wangberg, Sten-Ake, White, Christopher C, Wilson, Stephen R, Zepp, Richard G, Robinson, Sharon A, Andersen, Mads P. Sulbaek, Andrady, Anthony L, Bais, Alkiviadis F, Barnes, Paul, Bernhard, Germar H, Byrne, Scott N, Heikkila, Anu M, Ireland, Rachael, Jansen, Marcel A. K, Madronich, Sasha, McKenzie, Richard L, Neale, Rachel, Neale, Patrick J, Ossola, Rachele, Wang, Qing-Wei, Wangberg, Sten-Ake, White, Christopher C, Wilson, Stephen R, Zepp, Richard G, and Robinson, Sharon A

Abstract

This collection of Questions & Answers (Q&As) was prepared by the Environmental Effects Assessment Panel (EEAP) of the Montreal Protocol under the umbrella of the United Nations Environment Programme (UNEP). The document complements EEAP’s Quadrennial Assessment 2022 (https://ozone. unep.org/science/assessment/eeap) and provides interesting and useful information for policymakers, the general public, teachers, and scientists, written in an easy-to-understand language.

Published
2023

36. United Nations Environment Programme (UNEP), Plastics in the environment in the context of UV radiation, climate change and the Montreal Protocol. 2023 Assessment Update of the UNEP Environmental Effects Assessment Panel

Author

Jansen, Marcel A. K, Andrady, Anthony L, Bornman, Janet F, Aucamp, Pieter J, Bais, Alkiviadis F, Banaszak, Anastazia T, Barnes, Paul W, Bernhard, Germar H, Bruckman, Laura S, Busquets, Rosa, Hader, Donat P, Hanson, Mark L, Heikkila, Anu M, Hylander, Samuel, Lucas, Robyn M, Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J, Neale, Rachel E, Olsen, Catherine M, Ossola, Rachele, Pandey, Krishna K, Petropavlovskikh, Irina, Revell, Laura E, Robinson, Sharon A, Robson, T Matthew, Rose, Kevin C, Solomon, Keith R, Sulbaek Andersen, Mads P, Sulzberger, Barbara, Wallington, Timothy J, Wang, Qing-Wei, Wangberg, Sten-Ake, White, Christopher C, Young, Antony R, Zepp, Richard G, Zhu, Liping, Jansen, Marcel A. K, Andrady, Anthony L, Bornman, Janet F, Aucamp, Pieter J, Bais, Alkiviadis F, Banaszak, Anastazia T, Barnes, Paul W, Bernhard, Germar H, Bruckman, Laura S, Busquets, Rosa, Hader, Donat P, Hanson, Mark L, Heikkila, Anu M, Hylander, Samuel, Lucas, Robyn M, Mackenzie, Roy, Madronich, Sasha, Neale, Patrick J, Neale, Rachel E, Olsen, Catherine M, Ossola, Rachele, Pandey, Krishna K, Petropavlovskikh, Irina, Revell, Laura E, Robinson, Sharon A, Robson, T Matthew, Rose, Kevin C, Solomon, Keith R, Sulbaek Andersen, Mads P, Sulzberger, Barbara, Wallington, Timothy J, Wang, Qing-Wei, Wangberg, Sten-Ake, White, Christopher C, Young, Antony R, Zepp, Richard G, and Zhu, Liping

Abstract

This Assessment Update by the Environmental Effects Assessment Panel (EEAP) of the United Nations Environment Programme (UNEP) considers the interactive effects of solar UV radiation, global warming, and other weathering factors on plastics. The Assessment illustrates the significance of solar UV radiation in decreasing the durability of plastic materials, degradation of plastic debris, formation of micro- and nanoplastic particles and accompanying leaching of potential toxic compounds. Micro- and nanoplastics have been found in all ecosystems, the atmosphere, and in humans. While the potential biological risks are not yet well-established, the widespread and increasing occurrence of plastic pollution is reason for continuing research and monitoring. Plastic debris persists after its intended life in soils, water bodies and the atmosphere as well as in living organisms. To counteract accumulation of plastics in the environment, the lifetime of novel plastics or plastic alternatives should better match the functional life of products, with eventual breakdown releasing harmless substances to the environment.

Published
2023

37. Programa del Medio Ambiente de las Naciones Unidas (UNEP), Preguntas y Respuestas acerca de los Efectos de la Disminución del Ozono, la Radiación Ultravioleta y el Clima en los humanos y el Medio Ambiente. Suplemento del Reporte de Evaluación 2022 del Panel de Evaluación de los Efectos en el Medio Ambiente de las Naciones Unidas

Author

Sulbaek Andersen, Mads P, Andrady, Anthony L, Bais, Alkiviadis F, Barnes, Paul, Bernhard, Germar H, Byrne, Scott N, Heikkila, Anu M, Ireland, Rachael, Jansen, Marcel A. K, Madronich, Sasha, McKenzie, Richard L, Neale, Rachel, Neale, Patrick J, Ossola, Rachele, Wang, Qing-Wei, Wangberg, Sten-Ake, White, Christopher C, Wilson, Stephen R, Zepp, Richard G, Robinson, Sharon A, Sulbaek Andersen, Mads P, Andrady, Anthony L, Bais, Alkiviadis F, Barnes, Paul, Bernhard, Germar H, Byrne, Scott N, Heikkila, Anu M, Ireland, Rachael, Jansen, Marcel A. K, Madronich, Sasha, McKenzie, Richard L, Neale, Rachel, Neale, Patrick J, Ossola, Rachele, Wang, Qing-Wei, Wangberg, Sten-Ake, White, Christopher C, Wilson, Stephen R, Zepp, Richard G, and Robinson, Sharon A

Abstract

Esta colección de preguntas y respuestas fue preparada por el Panel de Evaluación de los Efectos en el Medio Ambiente (EEAP por sus siglas en inglés) del Protocolo de Montreal bajo el amparo del Programa para el Medio Ambiente de las Naciones Unidas (PNUM). Este documento es un complemento de la Evaluación Cuatrienal 2022 realizada por el EEAP (https://ozone. unep.org/science/assessment/eeap), y provee de información interesante y útil para redactores de políticas públicas, maestros y científicos. Este P&Rs está escrito en un lenguaje de fácil comprensión para el público en general.

Published
2023

41. Optimizing cooling approach of spiral coil for an electromagnetic steel teeming system of ladle in continuous casting production

Author

He, Ming, Wang, Qing-wei, Zhao, Li-jia, Mu, Wang-zhong, Liu, Xing-an, and Wang, Qiang

Abstract

To address the current issues with the conventional slide gate system utilized in the steel teeming process, a unique electromagnetic induction controlled automated steel teeming (EICAST) technology has been developed. Cooling means of spiral coil in this technology is directly related to its service life. Firstly, heat transfer processes of air cooling and spray cooling were compared and analyzed. Secondly, the impacts of water temperature, water flow rate and air flow rate were examined in order to maximize the spray cooling effect. To maintain coil temperature at a low value consistently throughout the entire thermal cycle process of the ladle, a combined cooling mode was finally employed. Numerical simulation was applied to examine the coil temperature variation with different cooling systems and characteristics. Before coil operation, spray cooling is said to be more effective. By controlling the water flow rate and air flow rate, the spray cooling effect is enhanced. However, water temperature has little or no impact when using spray cooling. Air cooling during the secondary refining process and spray cooling prior to coil operation are combined to further lower coil temperature. When the direction of the spray cooling is from bottom to top, the coil temperature is lowered below 165 °C. A practical induction coil cooling plan was provided for the EICAST technology’s production process.

Published
2024
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42. Influence Factors Analysis of Fe–C Alloy Blocking Layer in the Electromagnetic Induction-Controlled Automated Steel Teeming Technology

Author

He, Ming, Li, Xian-Liang, Wang, Qing-Wei, Wang, Qiang, Liu, Zhi-Yuan, and Wang, Chong-Jun

Abstract

In the electromagnetic induction-controlled automated steel teeming (EICAST) technology of ladle, the height and location of the blocking layer are critical factors to determine the structure size and installation location of induction coil. And, they are also the key parameters affecting the successful implementation of this new technology. In this paper, the influence of the liquid steel temperature, the holding time and the alloy composition on the height and location of the blocking layer were studied by numerical simulation. The simulation results were verified by 40 t ladle industrial experiments. Moreover, the regulation approach of the blocking layer was determined, and the determination process of coil size and its installation location were also analyzed. The results show that the location of the blocking layer moves down with the increase in the liquid steel temperature and the holding time. The height of the blocking layer decreases with the increase in the liquid steel temperature; however, it increases with the increase in the holding time. The height and location of the blocking layer can be largely adjusted by changing the alloy composition of filling particles in the upper nozzle. When the liquid steel temperature is 1550 °C, the holding time is 180 min and the alloy composition is confirmed, the melting layer height is 120 mm, and the blocking layer height is 129 mm, which are beneficial to design and installation of induction coil. These results are very important for the industrial implementation of the EICAST technology.

Published
2024
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45. Forest understory vegetation study: current status and future trends

Author

Deng, Jiaojiao, primary, Fang, Shuai, additional, Fang, Xiangmin, additional, Jin, Yanqiang, additional, Kuang, Yuanwen, additional, Lin, Fangmei, additional, Liu, Jiaqing, additional, Ma, Jingran, additional, Nie, Yanxia, additional, Ouyang, Shengnan, additional, Ren, Jing, additional, Tie, Liehua, additional, Tang, Songbo, additional, Tan, Xiangping, additional, Wang, Xugao, additional, Fan, Zhaofei, additional, Wang, Qing-Wei, additional, Wang, Hang, additional, and Liu, Chenggang, additional

Published
2023
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50. Ontogeny influences tree growth response to soil fertility and neighbourhood crowding in an old-growth temperate forest.

Author

Ren, Jing, Fang, Shuai, Wang, Qing-Wei, Liu, Hongyan, Lin, Fei, Ye, Ji, Hao, Zhanqing, Wang, Xugao, and Fortunel, Claire

Subjects
TREE growth, TEMPERATE forests, SOIL fertility, NEIGHBORHOODS, LEAF area
Abstract

Background and aims Abiotic and biotic factors simultaneously affect tree growth and thus shape community structure and dynamics. In particular, trees of different size classes show different growth responses to soil nutrients and neighbourhood crowding, but our understanding of how species' joint responses to these factors vary between size classes remains limited in multi-storied temperate forests. Here, we investigated size class differences in tree growth response to soil gradients and neighbourhood crowding in an old-growth temperate forest. Methods We combined growth data over 15 years from 38 902 individuals of 42 tree species with trait data in a 25-ha temperate forest plot in northeast China. We built hierarchical Bayesian models of tree growth to examine the effects of soil gradients and neighbourhood crowding between size classes and canopy types. Key results We found that soil and neighbours mainly acted separately in shaping tree growth in small and large trees. Soil total nitrogen and phosphorus increased tree growth in small trees, in particular of understorey species, but not in large trees. Neighbours reduced tree growth in both tree size classes, with stronger effects on large than small trees, and on canopy than understorey species. Furthermore, small trees with higher specific leaf area grew faster in fertile soils, and small trees with less seed mass grew faster in crowded environments. Large trees with higher specific leaf area, specific root length and less seed mass grew faster in crowded environments, while these traits had limited influence on tree growth response to soil gradients. Conclusions Our study highlights the importance of size class in modulating the response of tree growth to soil and neighbours, and the differential role of species canopy types and functional traits in capturing these effects in large vs. small trees. [ABSTRACT FROM AUTHOR]

Published
2023
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