Results 21 to 30 of about 45,670 (293)

Global review of source apportionment of volatile organic compounds based on highly time-resolved data from 2015 to 2021

open access: yesEnvironment International, 2022
Highly time-resolved data for volatile organic compounds (VOCs) can now be monitored. Source analyses of such high time-resolved concentrations provides key information for controlling VOC emissions.
Yang Yang   +7 more
doaj   +1 more source

Quantitative evidence from VOCs source apportionment reveals O3 control strategies in northern and southern China

open access: yesEnvironment International, 2023
Ground-level ozone (O3) pollution has received widespread attention because its rising trend and adverse ecological impacts. However, the extremely strong photochemical reactions of its precursor volatile organic compounds (VOCs) increase the difficulty ...
Zhenyu Wang   +9 more
doaj   +1 more source

Multiply improved positive matrix factorization for source apportionment of volatile organic compounds during the COVID-19 shutdown in Tianjin, China

open access: yesEnvironment International, 2022
Ambient concentrations of volatile organic compounds (VOCs) vary with emission rates, meteorology, and chemistry. Conventional positive matrix factorization (PMF) loses information because of dilution variations and chemical losses. Multiply improved PMF
Yao Gu   +6 more
doaj   +1 more source

Carbon emission reductions, pricing and social welfare of three-echelon supply chain considering consumer environmental awareness under carbon tax policy

open access: yesFrontiers in Environmental Science, 2022
With the rapid growth in carbon emissions from transport, reducing these emissions is becoming as important as reducing emissions from production. We took a transporter as a member of the supply chain system and constructed a three-echelon supply chain ...
Yunfeng Zhang, Ying Qin
doaj   +1 more source

Photon statistics in the cooperative spontaneous emission

open access: yesOptics Express, 2009
The second-order photon correlation function g((2))(tau) of photons emitted by a continuously pumped ensemble of N two-level systems coupled to a single-mode optical cavity well below the lasing threshold is investigated theoretically. A giant photon bunching is found for N < 10 emitters as the microscopic counterpart of spontaneous emission noise ...
Vasily V, Temnov, Ulrike, Woggon
openaire   +2 more sources

Review of source analyses of ambient volatile organic compounds considering reactive losses: methods of reducing loss effects, impacts of losses, and sources [PDF]

open access: yesAtmospheric Chemistry and Physics
Chemical losses of ambient reactive volatile organic compounds (VOCs) is a long-term issue yet to be resolved in VOC source apportionments. These losses substantially reduce the concentrations of highly reactive species in the apportioned factor profiles
B. Liu   +13 more
doaj   +1 more source

Cooperative emission in quantum plasmonic superradiance [PDF]

open access: yesPhysical Review B, 2019
Plasmonic superradiance originates from the plasmon mediated strong correlation that builds up between dipolar emitters coupled to a metal nanoparticle. This leads to a fast burst of emission so that plasmonic superradiance constitutes ultrafast and extremely bright optical nanosources of strong interest for integrated quantum nano-optics platforms. We
Varguet, H.   +3 more
openaire   +2 more sources

PUDL Raw EPA Hourly Continuous Emission Monitoring System (CEMS)

open access: yes
<p>US EPA hourly Continuous Emissions Monitoring System (CEMS) data. Hourly CO2, SO2, NOx emissions and gross load. Archived from <a href="https://campd.epa.gov/">https://campd.epa.gov/</a></p><p>This archive contains raw ...
Catalyst Cooperative
core   +3 more sources

Optimal emission control under public port rivalry: A comparison of competitive and cooperative policy

open access: yesMaritime Transport Research, 2020
This study examines the optimal emission control at two competing public ports. We first develop a two-stage duopoly model in which governments determine the emission standard that restrains shipping operators’ fuel quality and ports are involved in ...
Kevin Hyosoo Park   +2 more
doaj   +1 more source

Avidin cooperative allosterism upon binding biotin observed by differential changes in intrinsic fluorescence

open access: yesBiochemistry and Biophysics Reports, 2023
Similar to streptavidin, the binding of biotin by avidin does not appear to be cooperative in the traditional sense of altered binding strength, though it appears to be cooperative in terms of ligand induced structural communication across subunits in ...
Mark J. Waner   +6 more
doaj   +1 more source

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