Results 31 to 40 of about 877 (209)

Field-deployable diode-laser-based differential absorption lidar (DIAL) for profiling water vapor [PDF]

Atmospheric Measurement Techniques, 2015
A field-deployable water vapor profiling instrument that builds on the foundation of the preceding generations of diode-laser-based differential absorption lidar (DIAL) laboratory prototypes was constructed and tested. Significant advances are discussed,
S. M. Spuler, K. S. Repasky, B. Morley, D. Moen, M. Hayman, A. R. Nehrir   +5 more
doaj   +1 more source

Towards Developing a Micropulse Differential Absorption Lidar to Measure Atmospheric Temperature [PDF]

EPJ Web of Conferences, 2020
It has generally been assumed that differential absorption lidar (DIAL) systems are incapable of measuring atmospheric temperature with useful accuracy.
Stillwell Robert A., Spuler Scott M., Hayman Matthew, Bunn Catharine E., Repasky Kevin S.   +4 more
doaj   +1 more source

VAE+DDPG: An Attention‐Enhanced Variational Autoencoder for Deep Reinforcement Learning‐Based Autonomous Navigation in Low‐Light Environments

Advanced Intelligent Systems, EarlyView.
Variational Autoencoder+Deep Deterministic Policy Gradient addresses low‐light failures of infrared depth sensing for indoor robot navigation. Stage 1 pretrains an attention‐enhanced Variational Autoencoder (Convolutional Block Attention Module+Feature Pyramid Network) to map dark depth frames to a well‐lit reconstruction, yielding a 128‐D latent code ...
Uiseok Lee, Chanhong Hwang, Hyunseok Kang, Yechan Park, Hangwoo Jin, Tuan Anh Nguyen, Eunmi Choi, Dugki Min   +7 more
wiley   +1 more source

Restoring Trust: Rebuilding the Forest Carbon Credit System Through Scientific Rigor

Biological Diversity, EarlyView.
ABSTRACT As pivotal nature‐based climate solutions (NbCS), forests are increasingly recognized for their climate mitigation potential. However, this potential is undermined by fundamental flaws in current carbon credit systems. Our analysis identifies four interconnected systemic challenges: (1) subjective additionality assessments arising from ...
Xiaoqian Che, Shaokun Li
wiley   +1 more source

MERLIN (Methane Remote Sensing Lidar Mission): an Overview

EPJ Web of Conferences, 2016
The Methane Remote Sensing Lidar Mission (MERLIN), currently in phase B, is a joint cooperation between France and Germany on the development, launch and operation of a methane (CH4) monitoring satellite.
Pierangelo C., Millet B., Esteve F., Alpers M., Ehret G., Flamant P., Berthier S., Gibert F., Chomette O., Edouart D., Deniel C., Bousquet P., Chevallier F.   +12 more
doaj   +1 more source

Feasibility Study for an Airborne N2O Lidar [PDF]

EPJ Web of Conferences
Nitrous oxide, N2O is the third most important anthropogenic greenhouse gas after carbon dioxide and methane. The major source is nitrogen fertilization in croplands.
Kiemle Christoph, Fix Andreas, Fruck Christian, Wirth Martin   +3 more
doaj   +1 more source

Uncertainty Assessment of Differential Absorption Lidar Measurements of Industrial Emissions Concentrations

Remote Sensing, 2022
Differential absorption lidar (DIAL) has been shown to be a very effective technique for the location and quantification of emissions of pollutants and greenhouse gases at industrial facilities.
Fabrizio Innocenti, Tom Gardiner, Rod Robinson   +2 more
doaj   +1 more source

Perceived importance and didactic difficulty of chemistry education: Insights from Czech teachers

The Curriculum Journal, EarlyView.
Abstract This empirical study examines how chemistry teachers in lower and upper secondary schools in the Czech Republic evaluate the content of the chemistry curriculum, focussing on its perceived importance and didactic difficulty. Based on a quantitative survey (N = 146), the study provides insight into the pedagogical content knowledge of ...
Jitka Lorenzová, Blanka Jirkovská, Martin Čapek Adamec, Jan Havlík, Petr Holzhauser, Daniela Nováková, Karel Němejc   +6 more
wiley   +1 more source

Laser remote sensing of the planetary boundary layer

Meteorologische Zeitschrift, 2002
Laser remote sensing techniques are new tools for experimental studies of the planetary boundary layer. Backscatter lidar can make use of differences in the aerosol distribution to characterize the layer structure and to reveal properties of the ...
Jens Bösenberg, Holger Linné
doaj   +1 more source

Atmospheric atomic mercury monitoring using differential absorption lidar techniques [PDF]

Applied Optics, 1989
Three-dimensional mapping of atmospheric atomic mercury has been performed with lidar techniques, to our knowledge, for the first time. Industrial pollution monitoring, as well as measurements of background concentrations, is reported. High-efficiency frequency doubling of narrowband pulsed dye laser radiation was employed to generate intense radiation
Edner, H, Faris, G. W, Sunesson, A, Svanberg, Sune   +3 more
openaire   +4 more sources