Results 121 to 130 of about 22,253 (240)

Back bombardment for dispenser and lanthanum hexaboride cathodes

Physical Review Special Topics. Accelerators and Beams, 2011
The back bombardment (BB) effect limits wide usage of thermionic rf guns. The BB effect induces not only ramping-up of a cathode’s temperature and beam current, but also degradation of cavity voltage and beam energy during a macropulse.
Mahmoud Bakr, R. Kinjo, Y. W. Choi, M. Omer, K. Yoshida, S. Ueda, M. Takasaki, K. Ishida, N. Kimura, T. Sonobe, T. Kii, K. Masuda, H. Ohgaki, H. Zen   +13 more
doaj   +1 more source

The thermionic emission constant A [PDF]

Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1929
1. Summary of Paper .—The main object of this paper is to apply Nordheim’s theory of the emission coefficient of electrons from metals so as to explain the remarkable relation between the constants A and X of the thermionic emission formula, first recorded by O. W.
openaire   +1 more source

Overcoming environmental constraints to high‐yielding eastern cottonwood productivity in the southeastern United States

Annals of Applied Biology, EarlyView.
The rising demand for biomass highlights Populus deltoides as a productive woody species. A 6‐year study in Sumter County, SC, assessed the effects of irrigation, fertilization, and clonal variation on growth and productivity. Eight clones were studied under two irrigation levels (33 and 1500 kPa) and nutrient rates (high: up to 182 kg N ha−1; low: 50%
G. A. Tuskan, S. D. Wullschleger, P. J. Hanson, M. A. Cregger, J. L. Field, B. P. Sloan, M. W. Cunningham, B. M. Cregg, J. L. Rakestraw, T. J. Tschaplinski   +9 more
wiley   +1 more source

Population and herbarium genomics provide a comprehensive framework for a revision of Microcoleus (Cyanobacteria)

Journal of Phycology, EarlyView.
Abstract Microcoleus is a cosmopolitan, filamentous cyanobacterium and a key component of biological soil crusts—complex microbial communities essential for primary production in diverse terrestrial environments. Here, we performed a taxonomic revision of several species of Microcoleus based on a large population genomic dataset.
Svatopluk Skoupý, Aleksandar Stanojković, Jeffrey R. Johansen, Dale A. Casamatta, Callahan McGovern, Anne D. Jungblut, Jutta Fastner, Petr Dvořák   +7 more
wiley   +1 more source

Effect of foot immersion and neck cooling on renal, intestinal, immune and inflammatory markers in older adults exposed to extreme heat

Experimental Physiology, EarlyView.
Abstract Older adults with reduced thermoregulatory capabilities are increasingly at risk of heat‐related pathophysiological outcomes (e.g., acute kidney injury, heatstroke) due to increasingly frequent, prolonged and intense heatwaves. Foot immersion and neck cooling have been proposed as practical, non‐electrical cooling strategies for protecting ...
Thomas McCarthy, Ben J. Lee, James J. McCormick, Kelli E. King, Emma R. McCourt, Luana C. Main, Robert D. Meade, Glen P. Kenny   +7 more
wiley   +1 more source

High-efficiency, low-temperature cesium diodes with lanthanum-hexaboride electrodes [PDF]

Lanthanum hexaboride electrodes in 1700 K cesium diodes may triple power outputs compared with those demonstrated for nuclear thermionic space applications. Still greater relative gains seem possible for emitters below 1700 K.
Morris, J. F.
core   +1 more source

Interfacial Engineering in Rare‐Earth Oxide/ZnO Heterojunctions for High‐Performance Trimethylamine Sensing and Fish Freshness Monitoring

Advanced Science, Volume 13, Issue 19, 2 April 2026.
This study realizes superior gas sensing performance via Yb2O3/ZnO heterojunction design, achieving highly sensitive/selective trimethylamine detection at room temperature while elucidating the intrinsic sensing mechanism. This innovation is applied to reliable real‐time fish freshness monitoring, paving a feasible way for translating advanced material
Junxi Cheng, Chang Liu, Miaomiao Liu, Qihua Sun, Jun Sun, Zhaofeng Wu   +5 more
wiley   +1 more source

Neuroprotective Effects of Cerium Oxide Nanoparticles During Spaceflight

Small Science, Volume 6, Issue 4, April 2026.
Cerium oxide nanoparticles are investigated as antioxidant neuroprotectants for neurons exposed to the spaceflight environment aboard the International Space Station. The treatment preserves neuronal morphology, supports neurite outgrowth, and stabilizes gene networks involved in antioxidant defense, mitochondrial function, and dopamine metabolism ...
Alessio Carmignani, Attilio Marino, Matteo Battaglini, Nicoletta Di Leo, Elisa Carrubba, Michele Balsamo, Giovanni Valentini, Gabriele Mascetti, Serena Perilli, Francesco De Boni, Sergio Marras, Mirko Prato, Giada Graziana Genchi, Gianni Ciofani   +13 more
wiley   +1 more source

When Are Capacitance–Voltage, Drive‐Level Capacitance Profiling, and Fast‐CV Actually Insensitive to Interface and Bulk Defects?

Solar RRL, Volume 10, Issue 6, 29 March 2026.
Capacitance‐based techniques are widely applied to profile doping in one‐sided semiconductor junctions, yet defect states can distort interpretation. Time‐dependent simulations compare capacitance–voltage, drive‐level capacitance profiling, and Fast‐CV, revealing their sensitivity to trap dynamics and providing guidance for interpreting capacitance ...
Lorenzo Perini, Michael A. Scarpulla, Giovanna Sozzi   +2 more
wiley   +1 more source

Toward Determination of the Critical Breakdown Field in Rutile Sn1‐x Ge x O2 Alloys

physica status solidi (a), Volume 223, Issue 6, 20 March 2026.
Mansur and collaborators report on experiments designed to determine the critical field for electrostatic breakdown in ultra‐wide‐bandgap rutile Sn1‐xGexO2 alloys. Lateral metal–semiconductor–metal structures fabricated on undoped thin‐film alloys with x = 70% grown by pulsed‐laser deposition show breakdown voltages approach 900 V, corresponding to a ...
Uddrity Mansur, Yu Zheng, Chin‐Hsiang Liao, John T. Heron, Steven J. Koester   +4 more
wiley   +1 more source