Results 101 to 110 of about 1,003,860 (311)

Global assessment of nitrogen deposition effects on terrestrial plant diversity : a synthesis [PDF]

, 2009
Atmospheric nitrogen (N) deposition is it recognized threat to plant diversity ill temperate and northern parts of Europe and North America. This paper assesses evidence from field experiments for N deposition effects and thresholds for terrestrial plant
Alkemade, R., Ashmore, M., Bobbink, R., Bustamante, M., Cinderby, S., Davidson, E., De Vries, W., Dentener, F., Emmett, B., Erisman, J. -W., Fenn, M., Galloway, J., Gilliam, F., Hicks, K., Nordin, A., Pardo, L., Spranger, T.   +16 more
core   +7 more sources

On the Lightweight Potential of Laser Additive Manufactured NiTi Triply Periodic Minimal Sheet Lattices

Advanced Engineering Materials, EarlyView.
This study explores the lightweight potential of laser additive‐manufactured NiTi triply periodic minimal surface sheet lattices. It systematically investigates the effects of relative density and unit cell size on surface quality, deformation recovery, compression behavior, and energy absorption.
Haoming Mo, Shuo Qu, Shiming Gao, Xu Song   +3 more
wiley   +1 more source

The Path Reduction Factor for the Prediction of Rain Attenuation Affecting Short EHF Terrestrial Links

IEEE Open Journal of Antennas and Propagation
The path reduction factor (PRF), a key element of semi-empirical rain attenuation statistics prediction models, is investigated to shed some light on its value for links shorter than 1 km. PRF is here calculated from simulations underpinned by the use of
Francesco Capelletti, Carlo Riva, Giuseppe Roveda, Lorenzo Luini   +3 more
doaj   +1 more source

Atmospheric effects on coherent laser systems [PDF]

Effects of the truncation of the gaussian beam by the telescope on the signal to noise ratio were studied.
Murty, S. S. R.
core   +1 more source

Atmospheric Effects and Calibrations [PDF]

International Astronomical Union Colloquium, 1994
AbstractAtmospheric opacity severely attenuates millimeter and submillimeter signals. Fluctuations in refractive index limit the angular resolution of interferometers. Conventional phase calibration does not remove atmospheric phase fluctuations, but new techniques may.
openaire   +1 more source

Laser Powder Bed Fusion of Copper–Tungsten Composites for Heat Sink Applications in High‐Power Electronics

Advanced Engineering Materials, EarlyView.
This article demonstrates the successful qualification of a copper–tungsten composite for laser powder bed fusion. The resulting components exhibited high density, high thermal conductivity, and reduced thermal expansion. Heat sinks with complex geometries were successfully manufactured, clearly showcasing the material's potential for additive ...
Simon Rauh, Shashank Deepak Prabhu, Jannik Huber, Lioba Fischer, Gerhard Wolf, Nico Hempel, Peter Mayr   +6 more
wiley   +1 more source

Characterization of Meteorological Conditions at the Lenghu Site from Long-Term Multi-Station Observations

Atmosphere
The Lenghu site has emerged as a prominent candidate for future large telescopes, making a detailed understanding of its meteorological environment essential as it directly determines telescope performance, observational efficiency, and data quality ...
Wenjuan Li, Anbing Ren, Kun Wang, Licai Deng, Fan Yang, Jifang Ma, Wei Xu, Xian Zhang, Jing Ma   +8 more
doaj   +1 more source

Perchlorate Exposure is Associated with Oxidative Stress and Indicators of Serum Iron Homeostasis among NHANES 2005–2008 Subjects

Biomarker Insights, 2015
Perchlorate (ClO 4 – ), an oxidizing agent, is a ubiquitous environmental pollutant. Several studies have investigated its thyroid hormone disrupting properties. Its associations with other biological measures are largely unknown.
Dina M. Schreinemachers, Andrew J. Ghio, Jon R. Sobus, Marc A. Williams   +3 more
doaj   +1 more source

Atmospheric effects on CO2 laser propagation [PDF]

An investigation was made of the losses encountered in the propagation of CO2 laser radiation through the atmosphere, particularly as it applies to the NASA/Marshall Space Flight Center Pulsed Laser Doppler System.
Bilbro, J. W., Murty, S. S. R.
core   +1 more source

Duplex Stainless Steel Laser‐Surface Textured: Stability in Brine Solution

Advanced Engineering Materials, EarlyView.
Controlled laser‐surface treatment (LST) of duplex DSS2205 steel is performed to increase its stability in brine solution under cyclic electrochemical assays. The superior protection with respect to flat and smooth panels is attributed to the presence of FeCr2O4 as the main protective oxide layer in the LST surface, after corrosion tests. The stability
Mohammad Rezayat, Hamidreza Enshaei, Elaine Armelin, José I. Iribarren, Antonio Mateo, Miguel Morales   +5 more
wiley   +1 more source