Results 51 to 60 of about 1,101,085 (183)

Ultra‐sensitive heterodyne detection at room temperature in the atmospheric windows

Nanophotonics
Abstract We report room temperature heterodyne detection of a quantum cascade laser beaten with a local oscillator on a unipolar quantum photodetector in two different atmospheric windows, at 4.8 µm and 9 µm. A noise equivalent power of few pW is measured by employing an active stabilization technique in which the local oscillator and
Saemian, M., Del Balzo, L., Gacemi, D., Todorov, Y., Rodriguez, E., Lopez, O., Darquié, B., Li, L., Davies, A.G., Linfield, E., Vasanelli, A., Sirtori, C.   +11 more
openaire   +6 more sources

What can 14 CO measurements tell us about OH? [PDF]

, 2008
The possible use of 14CO measurements to constrain hydroxyl radical (OH) concentrations in the atmosphere is investigated. 14CO is mainly produced in the upper atmosphere from cosmic radiation.
Mak, J., Bergamaschi, P., Krol, M.C., Dep Natuurkunde, Meirink, J., Marine and Atmospheric Research, Meirink, J.F., Lowe, D.   +7 more
core   +2 more sources

A consistent molecular hydrogen isotope chemistry scheme based on an independent bond approximation [PDF]

, 2009
The isotopic composition of molecular hydrogen (H₂) produced by photochemical oxidation of methane (CH₄) and Volatile Organic Compounds (VOCs) is a key quantity in the global isotope budget of (H<sub>2 ...
Sub Atmospheric physics and chemistry, M. C. Krol, G. Pieterse, T. Röckmann, Krol, M.C., Pieterse, G., Afd Marine and Atmospheric Research, Marine and Atmospheric Research, Röckmann, T.   +8 more
core   +3 more sources

Measurement of Atmospheric Water Vapor by a Spectrophotometric Technique

, 1962
A spectroscopic technique was used to measure the total amount of water vapor between the point of observation and the sun. Measurements were taken continuously throughout the day, yielding a detailed picture of water vapor variations as a function of ...
McMurry, Earl W.
core   +5 more sources

Experimental study on the solar heating and night sky radiative cooling properties of biochar

Case Studies in Thermal Engineering
Daytime solar heating and nighttime radiative cooling are of great significance to global energy conservation and carbon neutrality because of their low cost, zero energy consumption and environmentally friendly characteristics.
Haiwei Xie, Jianyun Luo, Yan Zhang, Jiajuan Yan, Yuhao Qing   +4 more
doaj   +1 more source

A dual-selective thermal emitter with enhanced subambient radiative cooling performance

Nature Communications
Radiative cooling is a zero-energy technology that enables subambient cooling by emitting heat into outer space (~3 K) through the atmospheric transparent windows. However, existing designs typically focus only on the main atmospheric transparent window (
Xueke Wu, Jinlei Li, Fei Xie, Xun-En Wu, Siming Zhao, Qinyuan Jiang, Shiliang Zhang, Baoshun Wang, Yunrui Li, Di Gao, Run Li, Fei Wang, Ya Huang, Yanlong Zhao, Yingying Zhang, Wei Li, Jia Zhu, Rufan Zhang   +17 more
doaj   +1 more source

THz detection of small molecule vapors in the atmospheric transmission windows

Optics Express, 2012
Using a low power beam of ultrashort THz pulses that propagate in the ambient laboratory environment we have measured the rotational signatures of small molecule vapors at frequencies within the atmospheric transmission windows. We investigate two types of apparatus.
Joseph S, Melinger, Yihong, Yang, Mahboubeh, Mandehgar, D, Grischkowsky   +3 more
openaire   +2 more sources

Do atmospheric aerosols form glasses? [PDF]

, 2008
Zobrist B, Marcolli C, Pedernera DA, Koop T. Do atmospheric aerosols form glasses? ATMOSPHERIC CHEMISTRY AND PHYSICS. 2008;8(17):5221-5244.A new process is presented by which water soluble organics might influence ice nucleation, ice growth, chemical ...
Koop, Thomas, B. Zobrist, D. A. Pedernera, Koop, T., Koop, Thomas ; https://orcid.org/, Pedernera, D. A., Marcolli, C., C. Marcolli, T. Koop, Marcolli, Claudia, Pedernera, D.A., Zobrist, Bernhard, Zobrist, B.   +12 more
core   +2 more sources

Preparation of Optical Window in the Infrared Region (35) µm Using Al2O3 Material

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2017
In this work optical window for infrared region was prepared by using Aluminum Oxide (Al2O3)material as antireflection coating on ZnSe substrate which covers the atmospheric window 3-5µm. the maximum transition was 97% at a wavelength 0f 4.4µm.
A.K. Iltaif, B.A. Al-Hilli, L.N. Abbas, S.A. Hasan   +3 more
doaj  

Rethinking the atmospheric downward longwave radiation: A black-gray body model for accurate estimation

Advances in Applied Energy
Accurately estimating atmospheric downward longwave radiation is critical for applications ranging from radiative cooling to building energy efficiency. The main challenge lies in its spectral variability, which depends strongly on sky conditions such as
Lanxin Li, Xianze Ao, Qiangyan Hao, Meiling Liu, Xiansheng Li, Kegui Lu, Chongwen Zou, Bin Zhao, Gang Pei   +8 more
doaj   +1 more source