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Real-time data from mobile platforms to evaluate sustainable transportation infrastructure 期刊论文
NATURE SUSTAINABILITY, 2020, 3 (6) : 463-+
作者:  Asensio, Omar Isaac;  Alvarez, Kevin;  Dror, Arielle;  Wenzel, Emerson;  Hollauer, Catharina;  Ha, Sooji
收藏  |  浏览/下载:8/0  |  提交时间:2020/06/09
PEF plastic synthesized from industrial carbon dioxide and biowaste 期刊论文
NATURE SUSTAINABILITY, 2020
作者:  Jiang, L.;  Gonzalez-Diaz, A.;  Ling-Chin, J.;  Malik, A.;  Roskilly, A. P.;  Smallbone, A. J.
收藏  |  浏览/下载:7/0  |  提交时间:2020/06/09
Monumental architecture at Aguada Fenix and the rise of Maya civilization 期刊论文
NATURE, 2020
作者:  Bedding, Timothy R.;  Murphy, Simon J.;  Hey, Daniel R.;  Huber, Daniel;  Li, Tanda;  Smalley, Barry;  Stello, Dennis;  White, Timothy R.;  Ball, Warrick H.;  Chaplin, William J.;  Colman, Isabel L.;  Fuller, Jim;  Gaidos, Eric;  Harbeck, Daniel R.;  Hermes, J. J.;  Holdsworth, Daniel L.;  Li, Gang;  Li, Yaguang;  Mann, Andrew W.;  Reese, Daniel R.;  Sekaran, Sanjay;  Yu, Jie;  Antoci, Victoria;  Bergmann, Christoph;  Brown, Timothy M.;  Howard, Andrew W.;  Ireland, Michael J.;  Isaacson, Howard;  Jenkins, Jon M.;  Kjeldsen, Hans;  McCully, Curtis;  Rabus, Markus;  Rains, Adam D.;  Ricker, George R.;  Tinney, Christopher G.;  Vanderspek, Roland K.
收藏  |  浏览/下载:30/0  |  提交时间:2020/07/03

Archaeologists have traditionally thought that the development of Maya civilization was gradual, assuming that small villages began to emerge during the Middle Preclassic period (1000-350 bc  dates are calibrated throughout) along with the use of ceramics and the adoption of sedentism(1). Recent finds of early ceremonial complexes are beginning to challenge this model. Here we describe an airborne lidar survey and excavations of the previously unknown site of Aguada Fenix (Tabasco, Mexico) with an artificial plateau, which measures 1,400 m in length and 10 to 15 m in height and has 9 causeways radiating out from it. We dated this construction to between 1000 and 800 bc using a Bayesian analysis of radiocarbon dates. To our knowledge, this is the oldest monumental construction ever found in the Maya area and the largest in the entire pre-Hispanic history of the region. Although the site exhibits some similarities to the earlier Olmec centre of San Lorenzo, the community of Aguada Fenix probably did not have marked social inequality comparable to that of San Lorenzo. Aguada Fenix and other ceremonial complexes of the same period suggest the importance of communal work in the initial development of Maya civilization.


Lidar survey of the Maya lowlands uncovers the monumental site of Aguada Fenix, which dates to around 1000-800 bc and points to the role of communal construction in the development of Maya civilization.


  
Can designs inspired by control theory keep deployment policies effective and cost-efficient as technology prices fall? 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (4)
作者:  Nunez-Jimenez, Alejandro;  Knoeri, Christof;  Hoppmann, Joern;  Hoffmann, Volker H.
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
policy design  clean energy  deployment policy  agent-based model  feed-in tariff  adjustment mechanism  solar photovoltaics  
Water Management Practices: Use Patterns, Related Factors, and Correlations With Irrigated Acres 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (3)
作者:  Nian, Yefan;  Huang, Qiuqiong;  Kovacs, Kent F.;  Henry, Christopher;  Krutz, Jason
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Adoption of improved biomass stoves in Kenya: a transect-based approach in Kiambu and Muranga counties 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (2)
作者:  Karanja, Alice;  Gasparatos, Alexandros
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
stove adoption  clean stoves  improved biomass stoves  gender  geographical location  sub-Saharan Africa  
Wafer-scale single-crystal hexagonal boron nitride monolayers on Cu (111) 期刊论文
NATURE, 2020, 579 (7798) : 219-+
作者:  Luong, Duy X.;  Bets, Ksenia V.;  Algozeeb, Wala Ali;  Stanford, Michael G.;  Kittrell, Carter;  Chen, Weiyin;  Salvatierra, Rodrigo V.;  Ren, Muqing;  McHugh, Emily A.;  Advincula, Paul A.;  Wang, Zhe;  Bhatt, Mahesh;  Guo, Hua;  Mancevski, Vladimir;  Shahsavari, Rouzbeh
收藏  |  浏览/下载:80/0  |  提交时间:2020/07/03

Ultrathin two-dimensional (2D) semiconducting layered materials offer great potential for extending Moore'  s law of the number of transistors in an integrated circuit(1). One key challenge with 2D semiconductors is to avoid the formation of charge scattering and trap sites from adjacent dielectrics. An insulating van der Waals layer of hexagonal boron nitride (hBN) provides an excellent interface dielectric, efficiently reducing charge scattering(2,3). Recent studies have shown the growth of single-crystal hBN films on molten gold surfaces(4) or bulk copper foils(5). However, the use of molten gold is not favoured by industry, owing to its high cost, cross-contamination and potential issues of process control and scalability. Copper foils might be suitable for roll-to-roll processes, but are unlikely to be compatible with advanced microelectronic fabrication on wafers. Thus, a reliable way of growing single-crystal hBN films directly on wafers would contribute to the broad adoption of 2D layered materials in industry. Previous attempts to grow hBN monolayers on Cu (111) metals have failed to achieve mono-orientation, resulting in unwanted grain boundaries when the layers merge into films(6,7). Growing single-crystal hBN on such high-symmetry surface planes as Cu (111)(5,8) is widely believed to be impossible, even in theory. Nonetheless, here we report the successful epitaxial growth of single-crystal hBN monolayers on a Cu (111) thin film across a two-inch c-plane sapphire wafer. This surprising result is corroborated by our first-principles calculations, suggesting that the epitaxial growth is enhanced by lateral docking of hBN to Cu (111) steps, ensuring the mono-orientation of hBN monolayers. The obtained single-crystal hBN, incorporated as an interface layer between molybdenum disulfide and hafnium dioxide in a bottom-gate configuration, enhanced the electrical performance of transistors. This reliable approach to producing wafer-scale single-crystal hBN paves the way to future 2D electronics.


  
Agroforestry as a pathway to agricultural yield impacts in climate-smart agriculture investments: Evidence from southern Malawi 期刊论文
ECOLOGICAL ECONOMICS, 2020, 167
作者:  Amadu, Festus O.;  Miller, Daniel C.;  McNamara, Paul E.
收藏  |  浏览/下载:4/0  |  提交时间:2020/07/02
Agroforestry  Climate-smart agriculture  Double hurdle  Maize yield  Malawi  
Household transitions to clean energy in a multiprovincial cohort study in China 期刊论文
NATURE SUSTAINABILITY, 2020, 3 (1) : 42-50
作者:  Carter, Ellison;  Yan, Li;  Fu, Yu;  Robinson, Brian;  Kelly, Frank;  Elliott, Paul;  Wu, Yangfeng;  Zhao, Liancheng;  Ezzati, Majid;  Yang, Xudong;  Chan, Queenie;  Baumgartner, Jill
收藏  |  浏览/下载:18/0  |  提交时间:2020/08/19
Heat exposure and global air conditioning 期刊论文
NATURE SUSTAINABILITY, 2020, 3 (1) : 25-28
作者:  Biardeau, Leopold T.;  Davis, Lucas W.;  Gertler, Paul;  Wolfram, Catherine
收藏  |  浏览/下载:4/0  |  提交时间:2020/08/19