Results 31 to 40 of about 941 (199)

Unipolar Barrier Near‐Infrared 2D Photodetectors for 3D Image Sensors

Advanced Science, EarlyView.
A MoTe2/WSe2/Cl–SnSe2 unipolar barrier photodetector is demonstrated, in which the WSe2 layer effectively blocks majority‐carrier injection, yielding suppressed dark current and enhanced near‐infrared (NIR) sensing. The device achieves high detectivity, a wide linear dynamic range, and fast response under 1310 nm illumination, enabling high‐fidelity 3D
Jung Pyo Hong, Sang‐Jun Kim, Jisu Jang, Je‐Jun Lee, Seong‐Jun Han, Eungseon Yeon, Jung Woo Kim, Jongtae Ahn, Sang Yeon Kim, Hyun Woo Ko, Sunghyun Han, Seung Ah Lee, Paul Hongsuck Seo, Young‐Woo Suh, Kimoon Lee, Gunuk Wang, Dong‐Guang Zheng, Sunghee Hong, Sangin Hahn, Seon Kyu Yoon, Min‐Chul Park, Do Kyung Hwang   +21 more
wiley   +1 more source

Estimation of background gas concentration from differential absorption lidar measurements [PDF]

Atmospheric Measurement Techniques, 2016
Approaches are considered to estimate the background concentration level of a target species in the atmosphere from an analysis of the measured data provided by the National Physical Laboratory's differential absorption lidar (DIAL) system.
P. Harris, N. Smith, V. Livina, T. Gardiner, R. Robinson, F. Innocenti   +5 more
doaj   +1 more source

Electrically Tunable Graphene‐Metal Hybrid Metasurfaces for High‐Efficiency, Broadband Mid‐Infrared Transmission Modulation

Advanced Science, EarlyView.
A graphene‐metal hybrid transmissive metasurface enables electrically tunable mid‐infrared transmission modulation through ionic gel top gating. By combining graphene with a metallic slit metasurface, high modulation efficiency and broadband operation are achieved simultaneously, demonstrating efficient electrical control of mid‐infrared transmission ...
Heonhak Ha, Jinseok Kong, Junhyung Kim, Jiwon Kang, Min Seok Jang   +4 more
wiley   +1 more source

Performance of Charm-F – the airborne demonstrator for Merlin

EPJ Web of Conferences, 2018
In 2015, the new airborne lidar CHARM-F for the measurement of the greenhouse gases carbon dioxide and methane was set into operation. It is an integrated path differential absorption (IPDA) lidar designed for the use onboard the German research aircraft
Amediek Axel, Ehret Gerhard, Fix Andreas, Wirth Martin, Büdenbender Christian, Quatrevalet Mathieu, Kiemle Christoph   +6 more
doaj   +1 more source

Harnessing the VO2 Phase Transition for Automatic Gain Control in Transimpedance Amplifiers

Advanced Electronic Materials, EarlyView.
A nanoscale VO2‐based volatile switch integrated into a transimpedance‐amplifier feedback loop dynamically lowers gain when input current rises, preventing saturation and extending dynamic range. Rapid self‐recovery restores high sensitivity without external reset circuitry.
Amir Gildor, Sariel Hodisan, Shahar Kvatinsky, Yoav Kalcheim   +3 more
wiley   +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

Spatial variation in liana effects on host‐tree allometry and biomass in an intact tropical forest

Ecography, EarlyView.
Lianas are increasing in abundance across the tropics, yet local spatial variation in their effects on host‐tree allometry and biomass, and the drivers of this variation within forests, remain poorly understood. Using field inventory, drone photogrammetry, and terrestrial laser scanning (TLS) across a 50‐ha plot on Barro Colorado Island, Panama, we ...
Sruthi M. Krishna Moorthy, Félicien Meunier, Stefan A. Schnitzer, Kim Calders, David M. DeFilippis, Antonio Aguilar, Nancy Pausenberger, Marco D. Visser, Helene C. Muller‐Landau, Hans Verbeeck   +9 more
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

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