منابع مشابه
Global and regional decreases in tropospheric oxidants from photochemical effects of aerosols
[1] We evaluate the sensitivity of tropospheric OH, O3, and O3 precursors to photochemical effects of aerosols not usually included in global models: (1) aerosol scattering and absorption of ultraviolet radiation and (2) reactive uptake of HO2, NO2, and NO3. Our approach is to couple a global 3-D model of tropospheric chemistry (GEOSCHEM) with aerosol fields from a global 3-D aerosol model (GOC...
متن کاملMetal-free photochemical silylations and transfer hydrogenations of benzenoid hydrocarbons and graphene
The first hydrogenation step of benzene, which is endergonic in the electronic ground state (S0), becomes exergonic in the first triplet state (T1). This is in line with Baird's rule, which tells that benzene is antiaromatic and destabilized in its T1 state and also in its first singlet excited state (S1), opposite to S0, where it is aromatic and remarkably unreactive. Here we utilized this fea...
متن کاملTransition metal ion-assisted photochemical generation of alkyl halides and hydrocarbons from carboxylic acids.
Near-UV photolysis of aqueous solutions of propionic acid and aqueous Fe(3+) in the absence of oxygen generates a mixture of hydrocarbons (ethane, ethylene and butane), carbon dioxide, and Fe(2+). The reaction becomes mildly catalytic (about five turnovers) in the presence of oxygen which converts a portion of alkyl radicals to oxidizing intermediates that reoxidize Fe(2+). The photochemistry i...
متن کاملEvaluating the Relation Between Ozone, NOx and Hydrocarbons: The Method of Photochemical Indicators
The method of photochemical indicators is a way to evaluate the sensitivity of O3 to its two main precursors, nitrogen oxides (NOx) and reactive organic gases (ROG), directly from ambient measurements. The method is based on identifying measureable species or species ratios that are closely associated with O3-NOx-ROG predictions in photochemical models. Several species of this type have been id...
متن کاملInterplay among Antioxidants and Oxidants in Psoriasis
Background: The etiology of psoriasis, a chronic inflammatory skin disease, has not been elucidated. However, Oxidant / antioxidant imbalance is suspected.The aim of this study was to evaluate oxidant / antioxidant status in psoriatic patients.Method: forty two psoriatic patients and 42 age and sex matched controls were recruited for this study. Serum total antioxidant ...
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ژورنال
عنوان ژورنال: Journal of the Fuel Society of Japan
سال: 1978
ISSN: 0369-3775,2185-226X
DOI: 10.3775/jie.57.10_860