Results 131 to 140 of about 42,931 (308)

Severity of Compound Precipitation and Temperature Extreme Events Over Africa at 1.5°C and 2°C Global Warming Levels

International Journal of Climatology, EarlyView.
Results indicate that, an increase in global warming level from 1.5°C to 2°C is likely to induce on the one hand a 3‐fold increase in the frequency of occurrence of dry and warm compound events, and on the other hand a 2‐fold increase in their duration, over West, Central, South‐West, and South‐East Africa, intensifying droughts through reduced ...
Thierry C. Fotso‐Nguemo, Arona Diedhiou, Gabriel Fotso‐Kamga, Ibrahima Diba, Moctar Camara, Roméo S. Tanessong, Derbetini A. Vondou   +6 more
wiley   +1 more source

A Low Distortion Radiation Pattern Ultra-Wideband TEM Horn Antenna

IEEE Open Journal of Antennas and Propagation
This paper introduces a low distortion radiation pattern ultra-wideband (UWB) transverse electromagnetic (TEM) horn antenna designed to operate in the 2 to 18 GHz frequency range.
Mahdi Zoghi, Farrokh Hodjatkashani, Mir Emad Lajevardi   +2 more
doaj   +1 more source

Assessing Past and Future Temperature‐ and Precipitation‐Based Indicators in the Republic of Yemen

International Journal of Climatology, EarlyView.
For the first time in the literature, this work assesses the past and future climatic trends over Yemen, a highly vulnerable country for which science‐based, high‐quality information for the development of climate change adaptation plans was not available until now.
Jorge Alvar‐Beltrán, Rodrigo Manzanas, Anika Seggel, Abdulwahid Arman, Ana Casanueva, Riccardo Soldan   +5 more
wiley   +1 more source

Geochronology of the Whittlesey sedimentary succession, eastern England: The ‘Pompeii’ of the British late Middle Pleistocene to Holocene record

Journal of Quaternary Science, EarlyView.
Abstract The sedimentary succession at Whittlesey preserves a unique British late Middle Pleistocene to Holocene record back to a time equivalent to at least marine oxygen isotope stage 8 (ca. 250 ka). This study builds on previously published sedimentology, geochronology and palaeoecology results to establish 20 sedimentary facies associations, with ...
H. E. Langford, M. D. Bateman, R. M. Briant, D. J. Horne   +3 more
wiley   +1 more source

Wideband volume horn array antenna with switchable polarization capability [PDF]

, 2010
This paper presents the most valuable theoretical results that confirm the possibility of practical realization of a wideband volume horn array antenna with the switchable polarization capability.
Martynyuk, Sergiy Y., Stepanenko, Petro Ya.   +1 more
core  

Chemical Ionization Mass Spectrometry: Fundamental Principles, Diverse Applications, and the Latest Technological Frontiers

Mass Spectrometry Reviews, EarlyView.
ABSTRACT The review examines the evolution of chemical ionization mass spectrometry (CI‐MS), a technique developed in 1966 by Field and Munson. CI is a soft‐ionization method that produces more intense molecular ions with less fragmentation than electron ionization (EI).
Malvika Dutt, Adriana Arigò, Giorgio Famiglini, Pierangela Palma, Achille Cappiello   +4 more
wiley   +1 more source

Part B: Pattern control of horn antennas [PDF]

During this period, the computations of the impedance elements were completed. These include interactions between the two electric current modes, the elecric current mode and the magnetic current mode, and the two magnetic current modes.
Balanis, Constantine A., Liu, Kefeng
core   +1 more source

Computer modeling of a ridge horn antenna [PDF]

, 2008
Tento projekt zahrnuje návrh a simulaci dvojité hřebenové trychtýřové antény s kmitočtovým pásmem od 1,73 GHz do 14,94 GHz. Zaměřuje se především na výpočet rozměrů trychtýře pro požadovaný zisk 20 dB a parametry dvojité hřebenové trychtýřové antény ...
Lacko, Tomáš
core  

Gaussian profiled horn antennas

, 1999
In many different applications parameters such efficiency, gain, directivity, etc., are really critical. By using the Gaussian techniques presented here, the radiating features of existing horn antenna systems can be improved, only by adding some portion of Gaussian horn antenna at the end or designing a new horn antenna system.
Gonzalo García, Ramón, Teniente Vallinas, Jorge, Río Bocio, Carlos del   +2 more
openaire   +2 more sources

Detecting and attributing climate change effects on vegetation: Australia as a test case

PLANTS, PEOPLE, PLANET, EarlyView.
Climate change is contributing to vegetation changes that threaten life support systems. Yet, inherent climatic variability and past and present human actions—such as clearing, burning and grazing regimes—also alter vegetation and complicate understanding of vegetation change. Australian ecosystems exemplify such complexity.
Laura J. Williams, Rachael V. Gallagher, Sami W. Rifai, Matthew A. Adeleye, Patrick J. Baker, David M. J. S. Bowman, Jake Eckersley, Jacqueline R. England, Michael‐Shawn Fletcher, Pauline F. Grierson, Assaf Inbar, Jürgen Knauer, Clare M. Stephens, Raphaël Trouvé, Belinda E. Medlyn   +14 more
wiley   +1 more source