Search
Results: 390
Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka
A Cutmore, B Ausín, M Maslin, T Eglinton, D Hodell, F Muschitiello, L Menviel, N Haghipour, B Martrat, V Margari, PC Tzedakis
Nov 22, 2021
ABSTRACT: We present new high‐resolution pollen records combined with palaeoceanographic proxies from the same samples in deep‐sea cores SHAK06‐5K and MD01‐2444 on the southwestern Iberian Margin, documenting regional vegetation...
Synchronous volcanic eruptions and abrupt climate change ∼17.7 ka plausibly linked by stratospheric ozone depletion.
Joseph R McConnell, Andrea Burke, Nelia W Dunbar, Peter Köhler, Jennie L Thomas, Monica M Arienzo, Nathan J Chellman, Olivia J Maselli, Michael Sigl, Jess F Adkins, Daniel Baggenstos, John F Burkhart, Edward J Brook, Christo Buizert, Jihong Cole-Dai, TJ Fudge, Gregor Knorr, Hans-F Graf, Mackenzie M Grieman, Nels Iverson, Kenneth C McGwire, Robert Mulvaney, Guillaume Paris, Rachael H Rhodes, Eric S Saltzman, Jeffrey P Severinghaus, Jørgen Peder Steffensen, Kendrick C Taylor, Gisela Winckler
Oct 03, 2018
Glacial-state greenhouse gas concentrations and Southern Hemisphere climate conditions persisted until ∼17.7 ka, when a nearly synchronous acceleration in deglaciation was recorded in paleoclimate proxies in large parts of the...
Study of an overmoded structure for megawatt Ka-band extended interaction klystron
Yifan Zu, Xuesong Yuan, Xiaotao Xu, Qingyun Chen, Matthew T. Cole, Yong Yin, Hailong Li, Bin Wang, Lin Meng, Yang Yan
Oct 31, 2023
For most applications in the millimeter wave band, corresponding to Ka and higher-frequency bands, relatively high atmospheric absorption necessitates the use of high-power sources. Here, a new approach for projecting an...
Study of an overmoded structure for megawatt Ka-band extended interaction klystron
Yifan Zu, Xuesong Yuan, Xiaotao Xu, Qingyun Chen, Matthew T. Cole, Yong Yin, Hailong Li, Bin Wang, Lin Meng, Yang Yan
Oct 31, 2023
For most applications in the millimeter wave band, corresponding to Ka and higher-frequency bands, relatively high atmospheric absorption necessitates the use of high-power sources. Here, a new approach for projecting an...
A Carbon Nanotube-based Hundred Watt-level Ka-band Backward Wave Oscillator
Carbon nanotube (CNT) cold-cathodes hold much promise in a variety of millimeter-wave and terahertz vacuum electronic radiation devices due to their inherent near instantaneous temporal turn-on and near-ideal ideal field...
A Carbon Nanotube-based Hundred Watt-level Ka-band Backward Wave Oscillator
Carbon nanotube (CNT) cold-cathodes hold much promise in a variety of millimeter-wave and terahertz vacuum electronic radiation devices due to their inherent near instantaneous temporal turn-on and near-ideal ideal field...
Development of a ka-band circular waveguide TM01-rectangular waveguide TE10 mode converter
Qingyun Chen, Xuesong Yuan, Tongbin Yang, Jie Xie, Xiaotao Xu, Bin Wang, Hailong Li, Yong Yin, Matthew Cole, Lin Meng, Yang Yan
Mar 31, 2020
The output/input circuit is a core component in all high-power millimeter-wave (MMW) radiation sources, and its performance specifications and reliability directly impact upon the performance of the radiation source device....
Development of a ka-band circular waveguide TM01-rectangular waveguide TE10 mode converter
Qingyun Chen, Xuesong Yuan, Tongbin Yang, Jie Xie, Xiaotao Xu, Bin Wang, Hailong Li, Yong Yin, Matthew Cole, Lin Meng, Yang Yan
Mar 31, 2020
The output/input circuit is a core component in all high-power millimeter-wave (MMW) radiation sources, and its performance specifications and reliability directly impact upon the performance of the radiation source device....
Impact of Self-Directed Learning and Educational Technology Readiness on Synchronous E-Learning
The coronavirus (COVID-19) has had severe global impacts in many aspects of education. Asian countries and regions have been the first responders to move entirely online since the epidemic started. The aim of this paper is...
Published by: IGI Global Scientific Publishing
Assessing the trend in sustainable remediation
Over the past decade, sustainable remediation has grown from an emerging concept into a widely accepted new institutional norm. Scholar literature increased exponentially from nearly none in late 1990s to over 400 publications...
Forecasting urban residential stock turnover dynamics using system dynamics and Bayesian model averaging
Knowing the size of building stock is perhaps the most basic determinant in assessing energy use in buildings. However, official statistics on urban residential stock for many countries are piecemeal at best. Previous studies...
Remobilization of dormant carbon from Siberian-Arctic permafrost during three past warming events.
Jannik Martens, Birgit Wild, Francesco Muschitiello, Matt O'Regan, Martin Jakobsson, Igor Semiletov, Oleg V Dudarev, Örjan Gustafsson
Oct 20, 2020
Carbon cycle models suggest that past warming events in the Arctic may have caused large-scale permafrost thaw and carbon remobilization, thus affecting atmospheric CO2 levels. However, observational records are sparse...
|
|< |
< |
1 |