Gaseous peroxides play important roles in atmospheric chemistry. To understand the pathways of the formation and removal of peroxides, atmospheric peroxide concentrations and their controlling factors were measured from 7:00 to 20:00 in September, October, and November 2013 at a heavily trafficked residential site in Beijing, China, with average concentrations of hydrogen peroxide (HO) and methyl hydroperoxide (MHP) at 0.55ppb and 0.063ppb, respectively. HO concentrations were higher in the afternoon and lower in the morning and evening, while MHP concentrations did not exhibit a regular diurnal pattern. Both HO and MHP concentrations increased at dusk in most cases. Both peroxides displayed monthly variations with higher concentrations in September. These results suggested that photochemical activity was the main controlling factor on variations of HO concentrations during the measurement period. Increasing concentrations of volatile organic compounds emitted by motor vehicles were important contributors to HO and MHP enrichment. High levels of HO and MHP concentrations which occurred during the measurement period probably resulted from the transport of a polluted air mass with high water vapor content passing over the Bohai Bay, China.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jes.2016.12.015 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Healing Trap States of Anomalous Antisite Defects via Surface Passivation in Lead Iodide Perovskites: A First-Principles Study.
Chemphyschem
January 2025
Department of Physics, Yingbin Road 688, Jinhua, CHINA.
Undesirable loss of open-circuit voltage and current of metal halide perovskite (MHP) solar cells are closely associated with defects, so theoretical calculations have been often performed to scrutinize the nature of defects in bulk of MHPs. Yet, exploring the properties of defects at surfaces of MHPs is severely lacking given the complexity of the surface defects with high concentrations. In this study, IPb (PbI) antisite defects, namely one Pb (I) site being occupied by one I (Pb) atom at the surfaces of the FAPbI3 (FA = CH(NH2)2) material, are found to create electron (hole) traps when the surfaces with IPb (PbI) antisite defects are negatively (positively) charged.
View Article and Find Full Text PDFThe Hot Phonon Bottleneck Effect in Metal Halide Perovskites.
J Phys Chem Lett
December 2024
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
The hot phonon bottleneck (HPB) effect has been proposed as one of the main phenomena behind the slow cooling in metal halide perovskites. Even though consensus has been reached regarding its existence, open questions remain concerning the HPB's specific applicability and potential regarding hot carrier solar cell (HCSC) applications. We present a full investigation using ensemble Monte Carlo simulations of the HPB effect in metal halide perovskites (MHP).
View Article and Find Full Text PDFThe genomic and clinical consequences of replacing procarbazine with dacarbazine in escalated BEACOPP for Hodgkin lymphoma: a retrospective, observational study.
Lancet Oncol
January 2025
Department of Haematology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK; Faculty of Health, Medicine, and Social Care, Anglia Ruskin University, Cambridge, UK; Department of Haematology, University of Cambridge, Cambridge, UK. Electronic address:
Background: Procarbazine-containing chemotherapy regimens are associated with cytopenias and infertility, suggesting stem-cell toxicity. When treating Hodgkin lymphoma, procarbazine in escalated-dose bleomycin-etoposide-doxorubicin-cyclophosphamide-vincristine-procarbazine-prednisolone (eBEACOPP) is increasingly replaced with dacarbazine (eBEACOPDac) to reduce toxicity. We aimed to investigate the impact of this drug substitution on the mutation burden in stem cells, patient survival, and toxicity.
View Article and Find Full Text PDFIon Migration and Redox Reactions in Axial Heterojunction Perovskite CsPb(BrCl) Nanowire Devices Revealed by Operando Nanofocused X-ray Photoelectron Spectroscopy.
ACS Nano
December 2024
Division of Synchrotron Radiation Research, Department of Physics, Lund University, 221 00 Lund, Sweden.
Metal-halide perovskites (MHPs) have gained substantial interest in the energy and optoelectronics field. MHPs in nanostructure forms, such as nanocrystals and nanowires (NWs), have further expanded the horizons for perovskite nanodevices in geometry and properties. A partial anion exchange within the nanostructure, creating axial heterojunctions, has significantly augmented the potential applications.
View Article and Find Full Text PDFMolecular Reconfiguration of Disordered Tellurium Oxide Transistors with Biomimetic Spectral Selectivity.
Adv Mater
December 2024
Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, 999077, P. R. China.
Article Synopsis
- The introduction of p-type disordered tellurium oxide enhances device capabilities by enabling dual-mode reconfigurability, allowing it to function as both a logic transistor and a neuromorphic device.
- The disordered surface of the tellurium oxide film improves oxygen adsorption, which helps regulate carrier concentration, resulting in high-performance characteristics with notable hole mobility and an impressive current ratio in transistor mode.
- As a neuromorphic device, this technology mimics the vision of bees, effectively responding to blue-to-ultraviolet light, and achieving tasks like in-sensor denoising and image recognition in both static and dynamic environments.
Want 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!