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13,430 results on '"Hyun Seok"'

625. Suppressed Thermal Quenching via Tetrafluoroborate-Induced Surface Reconstruction of CsPbBr3Nanocrystals for Efficient Perovskite Light-Emitting Diodes

Author

Jeon, Min-Gi, An, Gwang Hwi, Kirakosyan, Artavazd, Yun, Subin, Kim, Joonseok, Kim, Chang-Yeon, Lee, Hyun Seok, and Choi, Jihoon

Abstract

Although metal-halide perovskite nanocrystals (NCs) have garnered significant attention for optoelectronic applications, the presence of electrically insulating organic ligands in CsPbBr3NCs hinders efficient charge injection and transportation in light-emitting diodes (LEDs). A common approach to address this issue involves ligand exchange with shorter ligands and precise control of the surface ligand density through additional purification steps. Nevertheless, the practical application of these methods has been hindered by their poor structural integrity and high surface-defect density, which remain a challenge. Our investigation reveals that NOBF4treatment effectively replaces native ligands with BF4–anions, in which BF4–anions are readily coordinated with the positively charged CsPbBr3surface metal centers, thereby improving the photoluminescence quantum yield (PLQY) and thermal stability. In particular, the presence of BF4–anions coordinated at CsPbBr3surfaces efficiently suppresses the pathway of excitons toward thermally activated nonradiative recombination, leading to minimal thermal quenching and superior device performance in green-emitting PeLEDs. Notably, PeLEDs based on CsPbBr3NCs with the reconstructed surface via NOBF4treatment exhibit an improved current efficiency of 31.12 cd/A and an external quantum efficiency of 11.24%, increased by 2.8 times compared to that of the pristine sample, indicating the enhanced hole–electron injection and transport into the CsPbBr3NCs. Therefore, our results highlight the potential of NOBF4as a versatile reagent for the ligand exchange and surface passivation of CsPbBr3NCs, thereby offering promising prospects for the development of stable, high-performance PeLEDs.

Published
2024
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626. Enhancement of Electron Transport Characteristics Using MXene-MnFeO3Nanocomposite Integration with Fullerene Derivatives for the Perovskite-Based Solar Cells and Detectors

Author

Liu, Hailiang, Hussain, Sajjad, Ali Sheikh, Zulfqar, Aftab, Sikandar, Al-Enizi, Abdullah M., Adaikalam, Kathalingam, Kim, Hyun-Seok, Jung, Jongwan, Kim, Deok-Kee, Vikraman, Dhanasekaran, and Kang, Jungwon

Abstract

In this study, we prepared a hybrid film incorporating the MnFeO3-decorated conducting two-dimensional (2D) MXene sheet-suspended [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) electron transfer layer (ETL) for the perovskite solar cells (PSCs) and detectors. The incorporation of MXene-MnFeO3with the PCBM ETL could drive exceptional conducting features for the PSCs. Moreover, the presence of MXene-MnFeO3facilitated superior charge transfer pathways, thereby enhancing the electron extraction and collection processes. This enhancement was directed to improve the electron mobility within the device, resulting in high photocurrents. The designed interface engineering with the MXene-MnFeO3nanocomposite-tuned PCBM ETL has produced a remarkable power conversion efficiency of 17.79% ± 0.27. Moreover, X-ray detectors employing PCBM modulated with the MXene-MnFeO3ETL achieved notable performance metrics including 18.47 μA/cm2CCD-DCD, 5.53 mA/Gy·cm2sensitivity, 7.64 × 10–4cm2/V·s electron mobility, and 1.51 × 1015cm2/V·s trap density.

Published
2024
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642. Mesoscopic transport in KSTAR plasmas: avalanches and the E × B staircase

Author

Choi, Minjun J, Choi, Minjun J, Kwon, Jaemin, Qi, Lei, Diamond, Patrick H, Hahm, Taik-Soo, Jhang, Hogun, Kim, Juhyung, Leconte, Michael, Kim, Hyun-Seok, Kang, Jisung, Park, Byoung-Ho, Chung, Jinil, Lee, Jaehyun, Kim, Minho, Yun, Gunsu S, Nam, YU, Kim, Jaewook, Ko, Won-Ha, Lee, Kyu-Dong, Juhn, June-Woo, Choi, Minjun J, Choi, Minjun J, Kwon, Jaemin, Qi, Lei, Diamond, Patrick H, Hahm, Taik-Soo, Jhang, Hogun, Kim, Juhyung, Leconte, Michael, Kim, Hyun-Seok, Kang, Jisung, Park, Byoung-Ho, Chung, Jinil, Lee, Jaehyun, Kim, Minho, Yun, Gunsu S, Nam, YU, Kim, Jaewook, Ko, Won-Ha, Lee, Kyu-Dong, and Juhn, June-Woo

Abstract

The self-organization is one of the most interesting phenomena in the non-equilibrium complex system, generating ordered structures of different sizes and durations. In tokamak plasmas, various self-organized phenomena have been reported, and two of them, coexisting in the near-marginal (interaction dominant) regime, are avalanches and the E × B staircase. Avalanches mean the ballistic flux propagation event through successive interactions as it propagates, and the E × B staircase means a globally ordered pattern of self-organized zonal flow layers. Various models have been suggested to understand their characteristics and relation, but experimental researches have been mostly limited to the demonstration of their existence. Here we report detailed analyses of their dynamics and statistics and explain their relation. Avalanches influence the formation and the width distribution of the E × B staircase, while the E × B staircase confines avalanches within its mesoscopic width until dissipated or penetrated. Our perspective to consider them the self-organization phenomena enhances our fundamental understanding of them as well as links our findings with the self-organization of mesoscopic structures in various complex systems.

Published
2024

643. Positive feedbacks and alternative stable states in forest leaf types

Author

Zou, Yibiao, Zohner, Constantin M., Averill, Colin, Ma, Haozhi, Merder, Julian, Berdugo, Miguel, Bialic-Murphy, Lalasia, Mo, Lidong, Brun, Philipp, Zimmermann, Niklaus E., Liang, Jingjing, de-Miguel, Sergio, Nabuurs, Gert Jan, Reich, Peter B., Niinements, Ulo, Dahlgren, Jonas, Kändler, Gerald, Ratcliffe, Sophia, Ruiz-Benito, Paloma, de Zavala, Miguel Angel, Crowther, Thomas W., Abegg, Meinrad, Adou Yao, Yves C., Alberti, Giorgio, Almeyda Zambrano, Angelica M., Alvarado, Braulio Vilchez, Alvarez-Dávila, Esteban, Alvarez-Loayza, Patricia, Alves, Luciana F., Ammer, Christian, Antón-Fernández, Clara, Araujo-Murakami, Alejandro, Arroyo, Luzmila, Avitabile, Valerio, Aymard, Gerardo A., Baker, Timothy R., Bałazy, Radomir, Banki, Olaf, Barroso, Jorcely G., Bastian, Meredith L., Bastin, Jean Francois, Birigazzi, Luca, Birnbaum, Philippe, Bitariho, Robert, Boeckx, Pascal, Bongers, Frans, Bouriaud, Olivier, Brancalion, Pedro H.S., Brandl, Susanne, Brearley, Francis Q., Brienen, Roel, Broadbent, Eben N., Bruelheide, Helge, Bussotti, Filippo, Gatti, Roberto Cazzolla, César, Ricardo G., Cesljar, Goran, Chazdon, Robin, Chen, Han Y.H., Chisholm, Chelsea, Cho, Hyunkook, Cienciala, Emil, Clark, Connie, Clark, David, Colletta, Gabriel D., Coomes, David A., Valverde, Fernando Cornejo, Corral-Rivas, José J., Crim, Philip M., Cumming, Jonathan R., Dayanandan, Selvadurai, de Gasper, André L., Decuyper, Mathieu, Derroire, Géraldine, DeVries, Ben, Djordjevic, Ilija, Dolezal, Jiri, Dourdain, Aurélie, Obiang, Nestor Laurier Engone, Enquist, Brian J., Eyre, Teresa J., Fandohan, Adandé Belarmain, Fayle, Tom M., Feldpausch, Ted R., Ferreira, Leandro V., Finér, Leena, Fischer, Markus, Fletcher, Christine, Fridman, Jonas, Frizzera, Lorenzo, Gamarra, Javier G.P., Gianelle, Damiano, Glick, Henry B., Harris, David J., Hector, Andrew, Hemp, Andreas, Hengeveld, Geerten, Hérault, Bruno, Herbohn, John L., Herold, Martin, Hillers, Annika, Honorio Coronado, Eurídice N., Hui, Cang, Ibanez, Thomas, Iêda, Amaral, Imai, Nobuo, Jagodziński, Andrzej M., Jaroszewicz, Bogdan, Johannsen, Vivian Kvist, Joly, Carlos A., Jucker, Tommaso, Jung, Ilbin, Karminov, Viktor, Kartawinata, Kuswata, Kearsley, Elizabeth, Kenfack, David, Kennard, Deborah K., Kepfer-Rojas, Sebastian, Keppel, Gunnar, Khan, Mohammed Latif, Killeen, Timothy J., Kim, Hyun Seok, Kitayama, Kanehiro, Köhl, Michael, Korjus, Henn, Kraxner, Florian, Laarmann, Diana, Lang, Mait, Lewis, Simon L., Lu, Huicui, Lukina, Natalia V., Maitner, Brian S., Malhi, Yadvinder, Marcon, Eric, Marimon, Beatriz Schwantes, Marimon-Junior, Ben Hur, Marshall, Andrew R., Martin, Emanuel H., Kucher, Dmitry, Meave, Jorge A., Melo-Cruz, Omar, Mendoza, Casimiro, Merow, Cory, Mendoza, Abel Monteagudo, Moreno, Vanessa S., Mukul, Sharif A., Mundhenk, Philip, Nava-Miranda, María Guadalupe, Neill, David, Neldner, Victor J., Nevenic, Radovan V., Ngugi, Michael R., Niklaus, Pascal A., Oleksyn, Jacek, Ontikov, Petr, Ortiz-Malavasi, Edgar, Pan, Yude, Paquette, Alain, Parada-Gutierrez, Alexander, Parfenova, Elena I., Park, Minjee, Parren, Marc, Parthasarathy, Narayanaswamy, Peri, Pablo L., Pfautsch, Sebastian, Phillips, Oliver L., Picard, Nicolas, Piedade, Maria Teresa T.F., Piotto, Daniel, Pitman, Nigel C.A., Polo, Irina, Poorter, Lourens, Poulsen, Axel D., Poulsen, John R., Pretzsch, Hans, Arevalo, Freddy Ramirez, Restrepo-Correa, Zorayda, Rodeghiero, Mirco, Rolim, Samir G., Roopsind, Anand, Rovero, Francesco, Rutishauser, Ervan, Saikia, Purabi, Salas-Eljatib, Christian, Saner, Philippe, Schall, Peter, Schelhaas, Mart Jan, Schepaschenko, Dmitry, Scherer-Lorenzen, Michael, Schmid, Bernhard, Schöngart, Jochen, Searle, Eric B., Seben, Vladimír, Serra-Diaz, Josep M., Sheil, Douglas, Shvidenko, Anatoly Z., Silva-Espejo, Javier E., Silveira, Marcos, Singh, James, Sist, Plinio, Slik, Ferry, Sonké, Bonaventure, Souza, Alexandre F., Miscicki, Stanislaw, Stereńczak, Krzysztof J., Svenning, Jens Christian, Svoboda, Miroslav, Swanepoel, Ben, Targhetta, Natalia, Tchebakova, Nadja, ter Steege, Hans, Thomas, Raquel, Tikhonova, Elena, Umunay, Peter M., Usoltsev, Vladimir A., Valencia, Renato, Valladares, Fernando, van der Plas, Fons, Van Do, Tran, van Nuland, Michael E., Vasquez, Rodolfo M., Verbeeck, Hans, Viana, Helder, Vibrans, Alexander C., Vieira, Simone, von Gadow, Klaus, Wang, Hua Feng, Watson, James V., Werner, Gijsbert D.A., Westerlund, Bertil, Wiser, Susan K., Wittmann, Florian, Woell, Hannsjoerg, Wortel, Verginia, Zagt, Roderik, Zawiła-Niedźwiecki, Tomasz, Zhang, Chunyu, Zhao, Xiuhai, Zhou, Mo, Zhu, Zhi Xin, Zo-Bi, Irie C., Zou, Yibiao, Zohner, Constantin M., Averill, Colin, Ma, Haozhi, Merder, Julian, Berdugo, Miguel, Bialic-Murphy, Lalasia, Mo, Lidong, Brun, Philipp, Zimmermann, Niklaus E., Liang, Jingjing, de-Miguel, Sergio, Nabuurs, Gert Jan, Reich, Peter B., Niinements, Ulo, Dahlgren, Jonas, Kändler, Gerald, Ratcliffe, Sophia, Ruiz-Benito, Paloma, de Zavala, Miguel Angel, Crowther, Thomas W., Abegg, Meinrad, Adou Yao, Yves C., Alberti, Giorgio, Almeyda Zambrano, Angelica M., Alvarado, Braulio Vilchez, Alvarez-Dávila, Esteban, Alvarez-Loayza, Patricia, Alves, Luciana F., Ammer, Christian, Antón-Fernández, Clara, Araujo-Murakami, Alejandro, Arroyo, Luzmila, Avitabile, Valerio, Aymard, Gerardo A., Baker, Timothy R., Bałazy, Radomir, Banki, Olaf, Barroso, Jorcely G., Bastian, Meredith L., Bastin, Jean Francois, Birigazzi, Luca, Birnbaum, Philippe, Bitariho, Robert, Boeckx, Pascal, Bongers, Frans, Bouriaud, Olivier, Brancalion, Pedro H.S., Brandl, Susanne, Brearley, Francis Q., Brienen, Roel, Broadbent, Eben N., Bruelheide, Helge, Bussotti, Filippo, Gatti, Roberto Cazzolla, César, Ricardo G., Cesljar, Goran, Chazdon, Robin, Chen, Han Y.H., Chisholm, Chelsea, Cho, Hyunkook, Cienciala, Emil, Clark, Connie, Clark, David, Colletta, Gabriel D., Coomes, David A., Valverde, Fernando Cornejo, Corral-Rivas, José J., Crim, Philip M., Cumming, Jonathan R., Dayanandan, Selvadurai, de Gasper, André L., Decuyper, Mathieu, Derroire, Géraldine, DeVries, Ben, Djordjevic, Ilija, Dolezal, Jiri, Dourdain, Aurélie, Obiang, Nestor Laurier Engone, Enquist, Brian J., Eyre, Teresa J., Fandohan, Adandé Belarmain, Fayle, Tom M., Feldpausch, Ted R., Ferreira, Leandro V., Finér, Leena, Fischer, Markus, Fletcher, Christine, Fridman, Jonas, Frizzera, Lorenzo, Gamarra, Javier G.P., Gianelle, Damiano, Glick, Henry B., Harris, David J., Hector, Andrew, Hemp, Andreas, Hengeveld, Geerten, Hérault, Bruno, Herbohn, John L., Herold, Martin, Hillers, Annika, Honorio Coronado, Eurídice N., Hui, Cang, Ibanez, Thomas, Iêda, Amaral, Imai, Nobuo, Jagodziński, Andrzej M., Jaroszewicz, Bogdan, Johannsen, Vivian Kvist, Joly, Carlos A., Jucker, Tommaso, Jung, Ilbin, Karminov, Viktor, Kartawinata, Kuswata, Kearsley, Elizabeth, Kenfack, David, Kennard, Deborah K., Kepfer-Rojas, Sebastian, Keppel, Gunnar, Khan, Mohammed Latif, Killeen, Timothy J., Kim, Hyun Seok, Kitayama, Kanehiro, Köhl, Michael, Korjus, Henn, Kraxner, Florian, Laarmann, Diana, Lang, Mait, Lewis, Simon L., Lu, Huicui, Lukina, Natalia V., Maitner, Brian S., Malhi, Yadvinder, Marcon, Eric, Marimon, Beatriz Schwantes, Marimon-Junior, Ben Hur, Marshall, Andrew R., Martin, Emanuel H., Kucher, Dmitry, Meave, Jorge A., Melo-Cruz, Omar, Mendoza, Casimiro, Merow, Cory, Mendoza, Abel Monteagudo, Moreno, Vanessa S., Mukul, Sharif A., Mundhenk, Philip, Nava-Miranda, María Guadalupe, Neill, David, Neldner, Victor J., Nevenic, Radovan V., Ngugi, Michael R., Niklaus, Pascal A., Oleksyn, Jacek, Ontikov, Petr, Ortiz-Malavasi, Edgar, Pan, Yude, Paquette, Alain, Parada-Gutierrez, Alexander, Parfenova, Elena I., Park, Minjee, Parren, Marc, Parthasarathy, Narayanaswamy, Peri, Pablo L., Pfautsch, Sebastian, Phillips, Oliver L., Picard, Nicolas, Piedade, Maria Teresa T.F., Piotto, Daniel, Pitman, Nigel C.A., Polo, Irina, Poorter, Lourens, Poulsen, Axel D., Poulsen, John R., Pretzsch, Hans, Arevalo, Freddy Ramirez, Restrepo-Correa, Zorayda, Rodeghiero, Mirco, Rolim, Samir G., Roopsind, Anand, Rovero, Francesco, Rutishauser, Ervan, Saikia, Purabi, Salas-Eljatib, Christian, Saner, Philippe, Schall, Peter, Schelhaas, Mart Jan, Schepaschenko, Dmitry, Scherer-Lorenzen, Michael, Schmid, Bernhard, Schöngart, Jochen, Searle, Eric B., Seben, Vladimír, Serra-Diaz, Josep M., Sheil, Douglas, Shvidenko, Anatoly Z., Silva-Espejo, Javier E., Silveira, Marcos, Singh, James, Sist, Plinio, Slik, Ferry, Sonké, Bonaventure, Souza, Alexandre F., Miscicki, Stanislaw, Stereńczak, Krzysztof J., Svenning, Jens Christian, Svoboda, Miroslav, Swanepoel, Ben, Targhetta, Natalia, Tchebakova, Nadja, ter Steege, Hans, Thomas, Raquel, Tikhonova, Elena, Umunay, Peter M., Usoltsev, Vladimir A., Valencia, Renato, Valladares, Fernando, van der Plas, Fons, Van Do, Tran, van Nuland, Michael E., Vasquez, Rodolfo M., Verbeeck, Hans, Viana, Helder, Vibrans, Alexander C., Vieira, Simone, von Gadow, Klaus, Wang, Hua Feng, Watson, James V., Werner, Gijsbert D.A., Westerlund, Bertil, Wiser, Susan K., Wittmann, Florian, Woell, Hannsjoerg, Wortel, Verginia, Zagt, Roderik, Zawiła-Niedźwiecki, Tomasz, Zhang, Chunyu, Zhao, Xiuhai, Zhou, Mo, Zhu, Zhi Xin, and Zo-Bi, Irie C.

Abstract

The emergence of alternative stable states in forest systems has significant implications for the functioning and structure of the terrestrial biosphere, yet empirical evidence remains scarce. Here, we combine global forest biodiversity observations and simulations to test for alternative stable states in the presence of evergreen and deciduous forest types. We reveal a bimodal distribution of forest leaf types across temperate regions of the Northern Hemisphere that cannot be explained by the environment alone, suggesting signatures of alternative forest states. Moreover, we empirically demonstrate the existence of positive feedbacks in tree growth, recruitment and mortality, with trees having 4–43% higher growth rates, 14–17% higher survival rates and 4–7 times higher recruitment rates when they are surrounded by trees of their own leaf type. Simulations show that the observed positive feedbacks are necessary and sufficient to generate alternative forest states, which also lead to dependency on history (hysteresis) during ecosystem transition from evergreen to deciduous forests and vice versa. We identify hotspots of bistable forest types in evergreen-deciduous ecotones, which are likely driven by soil-related positive feedbacks. These findings are integral to predicting the distribution of forest biomes, and aid to our understanding of biodiversity, carbon turnover, and terrestrial climate feedbacks.

Published
2024

644. Dominance and rarity in tree communities across the globe : Patterns, predictors and threats

Author

Hordijk, Iris, Bialic-Murphy, Lalasia, Lauber, Thomas, Routh, Devin, Poorter, Lourens, Rivers, Malin C., ter Steege, Hans, Liang, Jingjing, Reich, Peter B., de-Miguel, Sergio, Nabuurs, Gert Jan, Gamarra, Javier G.P., Chen, Han Y.H., Zhou, Mo, Wiser, Susan K., Pretzsch, Hans, Paquette, Alain, Picard, Nicolas, Hérault, Bruno, Bastin, Jean Francois, Alberti, Giorgio, Abegg, Meinrad, Adou Yao, Yves C., Almeyda Zambrano, Angelica M., Alvarado, Braulio V., Alvarez-Davila, Esteban, Alvarez-Loayza, Patricia, Alves, Luciana F., Ammer, Christian, Antón-Fernández, Clara, Araujo-Murakami, Alejandro, Arroyo, Luzmila, Avitabile, Valerio, Aymard Corredor, Gerardo A., Baker, Timothy, Banki, Olaf, Barroso, Jorcely, Bastian, Meredith L., Birigazzi, Luca, Birnbaum, Philippe, Bitariho, Robert, Boeckx, Pascal, Bongers, Frans, Bouriaud, Olivier, Brancalion, Pedro H.S., Brandl, Susanne, Brienen, Roel, Broadbent, Eben N., Bruelheide, Helge, Bussotti, Filippo, Gatti, Roberto Cazzolla, Cesar, Ricardo G., Cesljar, Goran, Chazdon, Robin, Chisholm, Chelsea, Cienciala, Emil, Clark, Connie J., Clar, David B., Colletta, Gabriel, Coomes, David, Valverde, Fernando Cornejo, Corral-Rivas, Jose J., Crim, Philip, Cumming, Jonathan, Dayanandan, Selvadurai, de Gasper, André L., Decuyper, Mathieu, Derroire, Géraldine, DeVries, Ben, Djordjevic, Ilija, Iêda, Amaral, Dourdain, Aurélie, Dolezal, Jiri, Obiang, Nestor Laurier Engone, Enquist, Brian, Eyre, Teresa, Fandohan, Adandé Belarmain, Fayle, Tom M., Ferreira, Leandro V., Feldpausch, Ted R., Finér, Leena, Fischer, Markus, Fletcher, Christine, Frizzera, Lorenzo, Gianelle, Damiano, Glick, Henry B., Harris, David, Hector, Andrew, Hemp, Andreas, Hengeveld, Geerten, Herbohn, John, Hillers, Annika, Honorio Coronado, Eurídice N., Hui, Cang, Cho, Hyunkook, Ibanez, Thomas, Jung, Ilbin, Imai, Nobuo, Jagodzinski, Andrzej M., Jaroszewicz, Bogdan, Johannsen, Vivian, Joly, Carlos A., Jucker, Tommaso, Karminov, Viktor, Kartawinata, Kuswata, Kearsley, Elizabeth, Kenfack, David, Kennard, Deborah, Kepfer-Rojas, Sebastian, Keppel, Gunnar, Khan, Mohammed Latif, Killeen, Timothy, Kim, Hyun Seok, Kitayama, Kanehiro, Köhl, Michael, Korjus, Henn, Kraxner, Florian, Laarmann, Diana, Lang, Mait, Lewis, Simon, Lu, Huicui, Lukina, Natalia, Maitner, Brian, Malhi, Yadvinder, Marcon, Eric, Marimon, Beatriz Schwantes, Marimon-Junior, Ben Hur, Marshall, Andrew Robert, Martin, Emanuel, Martynenko, Olga, Meave, Jorge A., Melo-Cruz, Omar, Mendoza, Casimiro, Merow, Cory, Miscicki, Stanislaw, Mendoza, Abel Monteagudo, Moreno, Vanessa, Mukul, Sharif A., Mundhenk, Philip, Nava-Miranda, Maria G., Neill, David, Neldner, Victor, Nevenic, Radovan, Ngugi, Michael, Niklaus, Pascal A., Oleksyn, Jacek, Ontikov, Petr, Ortiz-Malavasi, Edgar, Pan, Yude, Parada-Gutierrez, Alexander, Parfenova, Elena, Park, Minjee, Parren, Marc, Parthasarathy, Narayanaswamy, Peri, Pablo L., Pfautsch, Sebastian, Phillips, Oliver L., Piedade, Maria Teresa, Piotto, Daniel, Pitman, Nigel C.A., Polo, Irina, Poulsen, Axel Dalberg, Poulsen, John R., Arevalo, Freddy Ramirez, Restrepo-Correa, Zorayda, Rodeghiero, Mirco, Rolim, Samir, Roopsind, Anand, Rovero, Francesco, Rutishauser, Ervan, Saikia, Purabi, Salas-Eljatib, Christian, Schall, Peter, Schepaschenko, Dmitry, Scherer-Lorenzen, Michael, Schmid, Bernhard, Schöngart, Jochen, Searle, Eric B., Seben, Vladimír, Serra-Diaz, Josep M., Sheil, Douglas, Shvidenko, Anatoly, Silva-Espejo, Javier, Silveira, Marcos, Singh, James, Sist, Plinio, Slik, Ferry, Sonké, Bonaventure, Souza, Alexandre F., Stereńczak, Krzysztof, Svenning, Jens Christian, Svoboda, Miroslav, Swanepoel, Ben, Targhetta, Natalia, Tchebakova, Nadja, Thomas, Raquel, Tikhonova, Elena, Umunay, Peter, Usoltsev, Vladimir, Valencia, Renato, Valladares, Fernando, van der Plas, Fons, Van Do, Tran, Van Nuland, Michael E., Martinez, Rodolfo Vasquez, Verbeeck, Hans, Viana, Helder, Vibrans, Alexander C., Vieira, Simone, von Gadow, Klaus, Wang, Hua Feng, Watson, James, Werner, Gijsbert D.A., Wittmann, Florian, Wortel, Verginia, Zagt, Roderick, Zawila-Niedzwiecki, Tomasz, Zhang, Chunyu, Zhao, Xiuhai, Zhu, Zhi Xin, Zo-Bi, Irie Casimir, Maynard, Daniel S., Crowther, Thomas W., Hordijk, Iris, Bialic-Murphy, Lalasia, Lauber, Thomas, Routh, Devin, Poorter, Lourens, Rivers, Malin C., ter Steege, Hans, Liang, Jingjing, Reich, Peter B., de-Miguel, Sergio, Nabuurs, Gert Jan, Gamarra, Javier G.P., Chen, Han Y.H., Zhou, Mo, Wiser, Susan K., Pretzsch, Hans, Paquette, Alain, Picard, Nicolas, Hérault, Bruno, Bastin, Jean Francois, Alberti, Giorgio, Abegg, Meinrad, Adou Yao, Yves C., Almeyda Zambrano, Angelica M., Alvarado, Braulio V., Alvarez-Davila, Esteban, Alvarez-Loayza, Patricia, Alves, Luciana F., Ammer, Christian, Antón-Fernández, Clara, Araujo-Murakami, Alejandro, Arroyo, Luzmila, Avitabile, Valerio, Aymard Corredor, Gerardo A., Baker, Timothy, Banki, Olaf, Barroso, Jorcely, Bastian, Meredith L., Birigazzi, Luca, Birnbaum, Philippe, Bitariho, Robert, Boeckx, Pascal, Bongers, Frans, Bouriaud, Olivier, Brancalion, Pedro H.S., Brandl, Susanne, Brienen, Roel, Broadbent, Eben N., Bruelheide, Helge, Bussotti, Filippo, Gatti, Roberto Cazzolla, Cesar, Ricardo G., Cesljar, Goran, Chazdon, Robin, Chisholm, Chelsea, Cienciala, Emil, Clark, Connie J., Clar, David B., Colletta, Gabriel, Coomes, David, Valverde, Fernando Cornejo, Corral-Rivas, Jose J., Crim, Philip, Cumming, Jonathan, Dayanandan, Selvadurai, de Gasper, André L., Decuyper, Mathieu, Derroire, Géraldine, DeVries, Ben, Djordjevic, Ilija, Iêda, Amaral, Dourdain, Aurélie, Dolezal, Jiri, Obiang, Nestor Laurier Engone, Enquist, Brian, Eyre, Teresa, Fandohan, Adandé Belarmain, Fayle, Tom M., Ferreira, Leandro V., Feldpausch, Ted R., Finér, Leena, Fischer, Markus, Fletcher, Christine, Frizzera, Lorenzo, Gianelle, Damiano, Glick, Henry B., Harris, David, Hector, Andrew, Hemp, Andreas, Hengeveld, Geerten, Herbohn, John, Hillers, Annika, Honorio Coronado, Eurídice N., Hui, Cang, Cho, Hyunkook, Ibanez, Thomas, Jung, Ilbin, Imai, Nobuo, Jagodzinski, Andrzej M., Jaroszewicz, Bogdan, Johannsen, Vivian, Joly, Carlos A., Jucker, Tommaso, Karminov, Viktor, Kartawinata, Kuswata, Kearsley, Elizabeth, Kenfack, David, Kennard, Deborah, Kepfer-Rojas, Sebastian, Keppel, Gunnar, Khan, Mohammed Latif, Killeen, Timothy, Kim, Hyun Seok, Kitayama, Kanehiro, Köhl, Michael, Korjus, Henn, Kraxner, Florian, Laarmann, Diana, Lang, Mait, Lewis, Simon, Lu, Huicui, Lukina, Natalia, Maitner, Brian, Malhi, Yadvinder, Marcon, Eric, Marimon, Beatriz Schwantes, Marimon-Junior, Ben Hur, Marshall, Andrew Robert, Martin, Emanuel, Martynenko, Olga, Meave, Jorge A., Melo-Cruz, Omar, Mendoza, Casimiro, Merow, Cory, Miscicki, Stanislaw, Mendoza, Abel Monteagudo, Moreno, Vanessa, Mukul, Sharif A., Mundhenk, Philip, Nava-Miranda, Maria G., Neill, David, Neldner, Victor, Nevenic, Radovan, Ngugi, Michael, Niklaus, Pascal A., Oleksyn, Jacek, Ontikov, Petr, Ortiz-Malavasi, Edgar, Pan, Yude, Parada-Gutierrez, Alexander, Parfenova, Elena, Park, Minjee, Parren, Marc, Parthasarathy, Narayanaswamy, Peri, Pablo L., Pfautsch, Sebastian, Phillips, Oliver L., Piedade, Maria Teresa, Piotto, Daniel, Pitman, Nigel C.A., Polo, Irina, Poulsen, Axel Dalberg, Poulsen, John R., Arevalo, Freddy Ramirez, Restrepo-Correa, Zorayda, Rodeghiero, Mirco, Rolim, Samir, Roopsind, Anand, Rovero, Francesco, Rutishauser, Ervan, Saikia, Purabi, Salas-Eljatib, Christian, Schall, Peter, Schepaschenko, Dmitry, Scherer-Lorenzen, Michael, Schmid, Bernhard, Schöngart, Jochen, Searle, Eric B., Seben, Vladimír, Serra-Diaz, Josep M., Sheil, Douglas, Shvidenko, Anatoly, Silva-Espejo, Javier, Silveira, Marcos, Singh, James, Sist, Plinio, Slik, Ferry, Sonké, Bonaventure, Souza, Alexandre F., Stereńczak, Krzysztof, Svenning, Jens Christian, Svoboda, Miroslav, Swanepoel, Ben, Targhetta, Natalia, Tchebakova, Nadja, Thomas, Raquel, Tikhonova, Elena, Umunay, Peter, Usoltsev, Vladimir, Valencia, Renato, Valladares, Fernando, van der Plas, Fons, Van Do, Tran, Van Nuland, Michael E., Martinez, Rodolfo Vasquez, Verbeeck, Hans, Viana, Helder, Vibrans, Alexander C., Vieira, Simone, von Gadow, Klaus, Wang, Hua Feng, Watson, James, Werner, Gijsbert D.A., Wittmann, Florian, Wortel, Verginia, Zagt, Roderick, Zawila-Niedzwiecki, Tomasz, Zhang, Chunyu, Zhao, Xiuhai, Zhu, Zhi Xin, Zo-Bi, Irie Casimir, Maynard, Daniel S., and Crowther, Thomas W.

Abstract

Aim: Ecological and anthropogenic factors shift the abundances of dominant and rare tree species within local forest communities, thus affecting species composition and ecosystem functioning. To inform forest and conservation management it is important to understand the drivers of dominance and rarity in local tree communities. We answer the following research questions: (1) What are the patterns of dominance and rarity in tree communities? (2) Which ecological and anthropogenic factors predict these patterns? And (3) what is the extinction risk of locally dominant and rare tree species?. Location: Global. Time period: 1990–2017. Major taxa studied: Trees. Methods: We used 1.2 million forest plots and quantified local tree dominance as the relative plot basal area of the single most dominant species and local rarity as the percentage of species that contribute together to the least 10% of plot basal area. We mapped global community dominance and rarity using machine learning models and evaluated the ecological and anthropogenic predictors with linear models. Extinction risk, for example threatened status, of geographically widespread dominant and rare species was evaluated. Results: Community dominance and rarity show contrasting latitudinal trends, with boreal forests having high levels of dominance and tropical forests having high levels of rarity. Increasing annual precipitation reduces community dominance, probably because precipitation is related to an increase in tree density and richness. Additionally, stand age is positively related to community dominance, due to stem diameter increase of the most dominant species. Surprisingly, we find that locally dominant and rare species, which are geographically widespread in our data, have an equally high rate of elevated extinction due to declining populations through large-scale land degradation. Main conclusions: By linking patterns and predictors of community dominance and rarity to extinction risk, our results sug

Published
2024

645. Global patterns and environmental drivers of forest functional composition

Author

Bouchard, Elise, Searle, Eric B., Drapeau, Pierre, Liang, Jingjing, Gamarra, Javier G.P., Abegg, Meinrad, Alberti, Giorgio, Zambrano, Angelica Almeyda, Alvarez-Davila, Esteban, Alves, Luciana F., Avitabile, Valerio, Aymard, Gerardo, Bastin, Jean François, Birnbaum, Philippe, Bongers, Frans, Bouriaud, Olivier, Brancalion, Pedro, Broadbent, Eben, Bussotti, Filippo, Gatti, Roberto Cazzolla, Češljar, Goran, Chisholm, Chelsea, Cienciala, Emil, Clark, Connie J., Corral-Rivas, José Javier, Crowther, Thomas W., Dayanandan, Selvadurai, Decuyper, Mathieu, de Gasper, André L., de-Miguel, Sergio, Derroire, Géraldine, DeVries, Ben, Djordjević, Ilija, Van Do, Tran, Dolezal, Jiri, Fayle, Tom M., Fridman, Jonas, Frizzera, Lorenzo, Gianelle, Damiano, Hemp, Andreas, Hérault, Bruno, Herold, Martin, Imai, Nobuo, Jagodziński, Andrzej M., Jaroszewicz, Bogdan, Jucker, Tommaso, Kepfer-Rojas, Sebastian, Keppel, Gunnar, Khan, Mohammed Latif, Kim, Hyun Seok, Korjus, Henn, Kraxner, Florian, Laarmann, Diana, Lewis, Simon, Lu, Huicui, Maitner, Brian S., Marcon, Eric, Marshall, Andrew R., Mukul, Sharif A., Nabuurs, Gert Jan, Nava-Miranda, María Guadalupe, Parfenova, Elena I., Park, Minjee, Peri, Pablo L., Pfautsch, Sebastian, Phillips, Oliver L., Piedade, Maria Teresa F., Piotto, Daniel, Poulsen, John R., Poulsen, Axel Dalberg, Pretzsch, Hans, Reich, Peter B., Rodeghiero, Mirco, Rolim, Samir, Rovero, Francesco, Saikia, Purabi, Salas-Eljatib, Christian, Schall, Peter, Schepaschenko, Dmitry, Schöngart, Jochen, Šebeň, Vladimír, Sist, Plinio, Slik, Ferry, Souza, Alexandre F., Stereńczak, Krzysztof, Svoboda, Miroslav, Tchebakova, Nadezhda M., ter Steege, Hans, Tikhonova, Elena V., Usoltsev, Vladimir A., Valladares, Fernando, Viana, Helder, Vibrans, Alexander C., Wang, Hua Feng, Westerlund, Bertil, Wiser, Susan K., Wittmann, Florian, Wortel, Verginia, Zawiła-Niedźwiecki, Tomasz, Zhou, Mo, Zhu, Zhi Xin, Zo-Bi, Irié C., Paquette, Alain, Bouchard, Elise, Searle, Eric B., Drapeau, Pierre, Liang, Jingjing, Gamarra, Javier G.P., Abegg, Meinrad, Alberti, Giorgio, Zambrano, Angelica Almeyda, Alvarez-Davila, Esteban, Alves, Luciana F., Avitabile, Valerio, Aymard, Gerardo, Bastin, Jean François, Birnbaum, Philippe, Bongers, Frans, Bouriaud, Olivier, Brancalion, Pedro, Broadbent, Eben, Bussotti, Filippo, Gatti, Roberto Cazzolla, Češljar, Goran, Chisholm, Chelsea, Cienciala, Emil, Clark, Connie J., Corral-Rivas, José Javier, Crowther, Thomas W., Dayanandan, Selvadurai, Decuyper, Mathieu, de Gasper, André L., de-Miguel, Sergio, Derroire, Géraldine, DeVries, Ben, Djordjević, Ilija, Van Do, Tran, Dolezal, Jiri, Fayle, Tom M., Fridman, Jonas, Frizzera, Lorenzo, Gianelle, Damiano, Hemp, Andreas, Hérault, Bruno, Herold, Martin, Imai, Nobuo, Jagodziński, Andrzej M., Jaroszewicz, Bogdan, Jucker, Tommaso, Kepfer-Rojas, Sebastian, Keppel, Gunnar, Khan, Mohammed Latif, Kim, Hyun Seok, Korjus, Henn, Kraxner, Florian, Laarmann, Diana, Lewis, Simon, Lu, Huicui, Maitner, Brian S., Marcon, Eric, Marshall, Andrew R., Mukul, Sharif A., Nabuurs, Gert Jan, Nava-Miranda, María Guadalupe, Parfenova, Elena I., Park, Minjee, Peri, Pablo L., Pfautsch, Sebastian, Phillips, Oliver L., Piedade, Maria Teresa F., Piotto, Daniel, Poulsen, John R., Poulsen, Axel Dalberg, Pretzsch, Hans, Reich, Peter B., Rodeghiero, Mirco, Rolim, Samir, Rovero, Francesco, Saikia, Purabi, Salas-Eljatib, Christian, Schall, Peter, Schepaschenko, Dmitry, Schöngart, Jochen, Šebeň, Vladimír, Sist, Plinio, Slik, Ferry, Souza, Alexandre F., Stereńczak, Krzysztof, Svoboda, Miroslav, Tchebakova, Nadezhda M., ter Steege, Hans, Tikhonova, Elena V., Usoltsev, Vladimir A., Valladares, Fernando, Viana, Helder, Vibrans, Alexander C., Wang, Hua Feng, Westerlund, Bertil, Wiser, Susan K., Wittmann, Florian, Wortel, Verginia, Zawiła-Niedźwiecki, Tomasz, Zhou, Mo, Zhu, Zhi Xin, Zo-Bi, Irié C., and Paquette, Alain

Abstract

Aim: To determine the relationships between the functional trait composition of forest communities and environmental gradients across scales and biomes and the role of species relative abundances in these relationships. Location: Global. Time period: Recent. Major taxa studied: Trees. Methods: We integrated species abundance records from worldwide forest inventories and associated functional traits (wood density, specific leaf area and seed mass) to obtain a data set of 99,953 to 149,285 plots (depending on the trait) spanning all forested continents. We computed community-weighted and unweighted means of trait values for each plot and related them to three broad environmental gradients and their interactions (energy availability, precipitation and soil properties) at two scales (global and biomes). Results: Our models explained up to 60% of the variance in trait distribution. At global scale, the energy gradient had the strongest influence on traits. However, within-biome models revealed different relationships among biomes. Notably, the functional composition of tropical forests was more influenced by precipitation and soil properties than energy availability, whereas temperate forests showed the opposite pattern. Depending on the trait studied, response to gradients was more variable and proportionally weaker in boreal forests. Community unweighted means were better predicted than weighted means for almost all models. Main conclusions: Worldwide, trees require a large amount of energy (following latitude) to produce dense wood and seeds, while leaves with large surface to weight ratios are concentrated in temperate forests. However, patterns of functional composition within-biome differ from global patterns due to biome specificities such as the presence of conifers or unique combinations of climatic and soil properties. We recommend assessing the sensitivity of tree functional traits to environmental changes in their geographic context. Furthermore, at a give

Published
2024

650. Emergent Spacetime: Reality or Illusion?

Author

Yang, Hyun Seok

Subjects
High Energy Physics - Theory, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology
Abstract

The contemporary physics has revealed growing evidences that the emergence can be applied to not only biology and condensed matter systems but also gravity and spacetime. We observe that noncommutative spacetime necessarily implies emergent spacetime if spacetime at microscopic scales should be viewed as noncommutative. Since the emergent spacetime is a new fundamental paradigm for quantum gravity, it is necessary to reexamine all the rationales to introduce the multiverse hypothesis from the standpoint of emergent spacetime. We argue that the emergent spacetime certainly opens a new perspective that may cripple all the rationales to introduce the multiverse picture. Moreover the emergent spacetime may rescue us from the doomsday of metastable multiverse as quantum mechanics did from the catastrophic collapse of classical atoms., Comment: 6 pages; Essay written for the Gravity Research Foundation 2015 Awards for Essays on Gravitation. arXiv admin note: substantial text overlap with arXiv:1503.00712

Published
2015

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