Rate coefficients for the gas-phase reactions of OH radicals with n-propyl butyrate (k(1)), n-butyl propionate (k(2)) and n-butyl butyrate (k(3)) are measured by both absolute and relative methods. The kinetics data obtained over the temperature range 273-372 K are used to derive the Arrhenius expressions (in units of cm(3) molecule(-1) s(-1)): k(1)=(1.92±0.50)×10(-12) exp[(400±80)/T], k(2)=(2.98±1.32)×10(-12) exp[(209±139)/T] and k(3)=(5.35±3.34)×10(-12) exp[(180±194)/T]. In addition, the rate coefficients for reactions of the three esters with Cl atoms are determined by the relative-rate method at room temperature and atmospheric pressure. The rate coefficients measured are (in units of 10(-10) cm(3) molecule(-1) s(-1)) as follows: n-propyl butyrate (1.4±0.1), n-butyl propionate (1.6±0.1), and n-butyl butyrate (1.7±0.1). The values obtained are presented, compared with previous determinations and discussed. Reactivity trends and atmospheric implications resulting from this work are also presented.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/cphc.201000262 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Electronic quenching of sulfur induced by argon collisions.
Phys Chem Chem Phys
January 2025
Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France.
An accurate potential energy model, explicitly designed for studying scattering and treating the spin-orbit and nonadiabatic couplings on an equal footing, is proposed for the S + Ar system. The model is based on the Effective Relativistic Coupling by Asymptotic Representation (ERCAR) approach, building the geometry dependence of the spin-orbit interaction a diabatisation scheme. The resulting full diabatic model is used in close-coupling calculations to compute inelastic scattering cross sections for de-excitation from the S(D) fine structure level into the P multiplet.
View Article and Find Full Text PDFChallenges in rural maternal health: how received public services and policy awareness affect health knowledge and practices.
Front Public Health
January 2025
Center for Experimental Economics in Education, Faculty of Education, Shaanxi Normal University, Xi'an, China.
Purpose: This study evaluates the effectiveness of rural maternal health services in improving pregnant women's health knowledge, practices, and outcomes in northwestern China, focusing on the roles of received public services and policy awareness.
Methods: Baseline surveys were conducted in rural Shaanxi Province in 2021 and 2023, involving 1,152 pregnant women from 85 townships, selected via multistage cluster random sampling. Data were collected through structured face-to-face interviews, covering health knowledge and behaviors.
Multispecies fisheries management of the Sultanate of Oman using bioeconomic model.
Heliyon
January 2025
Sultan Qaboos University, College of Agricultural and Marine Sciences, Department of Natural Resource Economics, Sultanate of Oman.
A bioeconomic analysis using the Gordon-Schafer surplus production model was conducted on Indian mackerel (), Yellowfin tuna (), Kingfish (), and Indian Oil Sardine () based on data from the Ministry of Agriculture, Fisheries, Wealth, and Water Resources of Oman from 1990 to 2020. The alignment of biological and economic yields with the ideal fishing efforts needed to attain maximum sustainable yield (MSY) and maximum economic yield (MEY) was considered in order to evaluate the economic efficiency of existing fisheries management. The long-term sustainability of Oman's fisheries is improved by this analysis, which identifies inefficiencies in resource use and suggests viable remedies.
View Article and Find Full Text PDFAnalysis of HAM-D Scores on Cognitive Functions and Heart Rate Variability in Patients with Major Depressive Disorder.
Niger Med J
January 2025
Department of Physiology, RUHS College of Medical Sciences, India.
Background: Previous research has shown that Major Depressive Disorder (MDD) is accompanied by severe impairments in cognitive and autonomic processes, which may linger even when mood symptoms recover. This study aimed to analyse the relationship between depression severity, as measured by the Hamilton Depression Rating Scale (HAM-D), and how it affects heart rate variability (HRV) and cognitive function in patients with Major Depressive Disorder (MDD).
Methodology: The cross-sectional study was conducted at RUHS College of Medical Sciences and Associated Hospitals, Jaipur, from July 2022 to January 2023 on 90 subjects having major depressive disorder (MDD) of either sex in the 20-40 age group using the Hamilton score for depression (HAM D), Heart Rate Variability (HRV) measurements, and a battery of cognitive tests.
The mid-wave multispectral detector combines the traditional spectrometer and infrared detector technologies to provide image information and spectral information at the same time, which has an important role in both civil and military fields. To solve the working band limitation and low energy utilization, this paper presents an integrated superlattice mid-wave multispectral hypersurface detector that can be used for computational multispectroscopy for the first time, which consists of photonic crystal (PC) plates of GaSb material, and uses PC microstructures to modulate the incident spectra, which can be used to reconstruct incident signals with computational multispectroscopy methods. In this paper, the finite difference time domain method (FDTD) is used to simulate the structural parameters of different PCs, and finally calculate the correlation coefficients of the transmission spectra of the different structures as well as the energy utilization rate.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!