Results 31 to 40 of about 2,227,952 (336)

Synthesis of tert-amylbenzene for side-chain alkylation of cumene catalyzed by a solid superbase

Green Processing and Synthesis, 2021
The side-chain alkylation of cumene and ethylene over a solid superbase catalyst K/KOH/γ-Al2O3 is investigated. The effects of the reaction temperature, pressure, and time on the conversion of cumene and selectivity of tert-amylbenzene (TAB) are ...
Zhou Xin, Gao Ge, He Guangxiang, Guo Xiaoyan, Jin Haibo, Ma Lei   +5 more
doaj   +1 more source

Assessment of Coarse, Fine, and Ultrafine Particles in S-Bahn Trains and Underground Stations in Stuttgart

Atmosphere, 2022
The Stuttgart S-Bahn network comprises six subway lines and is used by approximately 425,000 people on a daily basis. In previous studies in other cities, it was found that subways can be a source and collection point of particulate matter (PM), which is
Abdul Samad, Kathryn Arango, Diego Alvarez Florez, Ioannis Chourdakis, Ulrich Vogt   +4 more
doaj   +1 more source

Performance analysis of air curtains on indoor environment and dehumidification energy consumption in a low humidity plant

Journal of Asian Architecture and Building Engineering, 2023
The purpose of this study is to evaluate the effect of air curtains on indoor environment and dehumidification energy consumption for different air supply angle and velocity. The numerical investigation is conducted in a low-humidity plant located in the
Yubin Tang, Qiuhua Tao, Jianwen Zheng
doaj   +1 more source

Investigating a Low-Cost Dryer Designed for Low-Cost PM Sensors Measuring Ambient Air Quality

Sensors, 2021
Air pollution in urban areas is a huge concern that demands an efficient air quality control to ensure health quality standards. The hotspots can be located by increasing spatial distribution of ambient air quality monitoring for which the low-cost ...
Abdul Samad, Freddy Ernesto Melchor Mimiaga, Bernd Laquai, Ulrich Vogt   +3 more
doaj   +1 more source

Atomic Hydrogen Cleaning of Polarized GaAs Photocathodes

, 2004
Atomic hydrogen cleaning followed by heat cleaning at 450$^\circ$C was used to prepare negative-electron-affinity GaAs photocathodes. When hydrogen ions were eliminated, quantum efficiencies of 15% were obtained for bulk GaAs cathodes, higher than the ...
Brachmann, A., Clendenin, J. E., Garwin, E. L., Harvey, S., Kirby, R. E., Luh, D. -A., Maruyama, T., Prepost, R., Prescott, C. Y.   +8 more
core   +2 more sources

CleanML: A Study for Evaluating the Impact of Data Cleaning on ML Classification Tasks

, 2020
Data quality affects machine learning (ML) model performances, and data scientists spend considerable amount of time on data cleaning before model training.
Blase, Jennifer, Chu, Xu, Li, Peng, Rao, Xi, Zhang, Ce, Zhang, Yue   +5 more
core   +1 more source

Toward sustainable management: 2D modelling of a self-cleaning system to improve geometry in front of the flushing gate [PDF]

, 2018
This paper aims to show how numerical modelling based on 2D SWE can be used to analyze the cleaning effectiveness of flushing waves in storm tanks.
Choi, Gyewoon, Gómez Valentín, Manuel, Jang, Dongwoo, Ruiloba, Luis Carlos, Russo, Beniamino   +4 more
core   +4 more sources

Effects of maritime saline and humid environments on the characteristics of combustion dropping behavior of flexible polyurethane foam

Case Studies in Thermal Engineering
Flexible polyurethane foam (FPUF), a common combustible material in ship cabins, poses fire safety risks due to its molten droplet flow and dropping behavior.
Yangui Chen, Hongzhou He, Jieqing Zheng, Zhongqing Liu, Dimeng Lai   +4 more
doaj   +1 more source

Concept of Using an Unmanned Aerial Vehicle (UAV) for 3D Investigation of Air Quality in the Atmosphere—Example of Measurements Near a Roadside

Atmosphere, 2022
A substantial amount of air pollution is emitted from urban sources. Hence, investigating air pollutant dispersion from urban sources is of great importance. The mechanisms influencing air pollutant dispersion also need to be studied thoroughly. Unmanned
Abdul Samad, Diego Alvarez Florez, Ioannis Chourdakis, Ulrich Vogt   +3 more
doaj   +1 more source

Microbiological evaluation of different reprocessing methods for cuffed and un-cuffed tracheostomy tubes in home-care and hospital setting [PDF]

, 2016
Background: Manufacturers’ recommendations on cleaning of tracheostomy tubes focus on general warning information and non-specific manual cleaning procedures.
Assadian, Ojan, Leonhard, Matthias, Schneider-Stickler, Berit, Zumtobel, Michaela   +3 more
core   +2 more sources