Results 71 to 80 of about 614,731 (268)

Spatiotemporal variability of human–fire interactions on the Navajo Nation

Ecosphere, 2019
Unraveling the effects of climate and land use on historical fire regimes provides important insights into broader human–fire–climate dynamics, which are necessary for ecologically based forest management.
Christopher H. Guiterman, Ellis Q. Margolis, Christopher H. Baisan, Donald A. Falk, Craig D. Allen, Thomas W. Swetnam   +5 more
doaj   +1 more source

PBF‐LB/M of Ti‐6Al‐4V: High‐Pressure Solution Treatment and Aging for Applications in a Sustainable Aerospace

Advanced Engineering Materials, EarlyView.
Additive manufacturing (AM) allows great geometric freedom for lightweight components. As parts are progressively optimized exploiting potentials in AM leading in smaller material cross sections, high pressure solution treating and aging (STA) treatments show an enormous potential for strongly improving material properties.
Mika León Altmann, Andre Danzig, Freerk Syassen, Rainer Fechte‐Heinen, Anastasiya Toenjes   +4 more
wiley   +1 more source

Comparison of drought-sensitive tree-ring records from the Tien Shan of Kyrgyzstan and Xinjiang (China) during the last six centuries

Advances in Climate Change Research, 2017
In this study, tree-ring width data of Schrenk spruce (Picea schrenkiana) from the upper timberline of the Tien Shan (Kyrgyzstan) were analyzed to investigate the effect of climate change.
Hui-Qin Wang, Feng Chen, Bakytbek Ermenbaev, Rysbek Satylkanov   +3 more
doaj   +1 more source

Investigation of Laser Ablation and Brush Pre‐Treatments for AlCu Cold Roll Bonding in Oxygen‐Free Conditions

Advanced Engineering Materials, EarlyView.
It is shown that laser ablation pretreatment under oxygen‐free conditions enables copper–aluminium bonding at significantly lower deformation degrees and improved properties compared to mechanical brushing. Laser ablation further increases interface contact area and induces favourable residual stress states and microstructural compatibility ...
Khemais Barienti, Finn‐Lennard Janthur, Selina Raumel, Sascha Jan Zimmermann, Sarah Seffer, René Gustus, Sebastian Herbst, Marc C. Wurz, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Florian Nürnberger   +11 more
wiley   +1 more source

Matrix Model and Time-like Linear Dilaton Matter

, 2004
We consider a matrix model description of the 2d string theory whose matter part is given by a time-like linear dilaton CFT. This is equivalent to the c=1 matrix model with a deformed, but very simple fermi surface. Indeed, after a Lorentz transformation,
A. Kapustin, A. Sen, A. Sen, A. Sen, A. Strominger, A. Strominger, A.B. Zamolodchikov, B. Craps, B.C. Da Cunha, D. Gaiotto, E.J. Martinec, E.J. Martinec, F. Larsen, G.W. Moore, H. Ita, I.K. Kostov, I.R. Klebanov, I.R. Klebanov, J. Lee, J. McGreevy, J. Polchinski, J. Teschner, J. Teschner, J.L. Karczmarek, J.L. Karczmarek, J.L. Karczmarek, K. Okuyama, M. Aganagic, M. Ernebjerg, M.R. Douglas ., N. Itzhaki, N. Lambert, N. Seiberg, N. Seiberg, N. Toumbas, P. Mukhopadhyay, P.H. Ginsparg, R. Dijkgraaf, S. Alexandrov, S. Fredenhagen, S. Gukov, S. Hellerman, S. Hellerman, S.R. Das, T. Takayanagi, T. Takayanagi, T. Takayanagi, Tadashi Takayanagi, U.H. Danielsson, V. Balasubramanian, V. Fateev, V. Schomerus, X. Yin, Y. Hikida   +53 more
core   +4 more sources

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Phenological activities of cambium and inter-annual variations of Pinus densiflora saplings upon CO2 enrichment

Journal of Wood Science
The current study investigated the long-term effects of CO2 enrichment on cambial activity and wood tracheid traits of Pinus densiflora grown in Open Top Chambers (OTCs).
Jun-Hui Park, En-Bi Choi, Hyemin Lim, Jeong-Wook Seo   +3 more
doaj   +1 more source

Changing climate response in near-treeline bristlecone pine with elevation and aspect

Environmental Research Letters, 2014
In the White Mountains of California, eight bristlecone pine ( Pinus longaeva ) tree-ring width chronologies were developed from trees at upper treeline and just below upper treeline along North- and South-facing elevational transects from treeline to ...
Matthew W Salzer, Evan R Larson, Andrew G Bunn, Malcolm K Hughes   +3 more
doaj   +1 more source

Laser Metal Powder Deposition of Titanium Microalloyed HSLA Steel FeC0.12Si0.25Mn1.3

Advanced Engineering Materials, EarlyView.
This study investigates the additive manufacturing of titanium‐doped high‐strength low‐alloy (HSLA) steel via laser metal deposition. It reveals distinct process‐structure relationships for elemental powder blends compared to prealloyed feedstocks.
Olaf Stelling, Matthias Steinbacher, Nils Ellendt   +2 more
wiley   +1 more source

Tree-ring evidence of the elusive 1959 summer cold event in northwestern North America

Arctic, Antarctic, and Alpine Research
Tree-ring records in northwestern North America suggest that the year 1959 was anomalously cold relative to the last several centuries. Here, we investigate the spatial characteristics, specific timing, and magnitude of the 1959 cold event through ...
Caroline Leland, Nicole Davi, Rosanne D’Arrigo, Laia Andreu-Hayles, Arturo Pacheco-Solana, Julie Edwards, Kevin J. Anchukaitis, Trevor J. Porter, Michael F.J. Pisaric, Madeleine Mant, Tracey Galloway, Rose Oelkers   +11 more
doaj   +1 more source