Our understanding of the complex aqueous chemistry of iron in natural systems has advanced significantly over recent years. Here we will highlight how new contributions from nanogeoscience combine with conventional aqueous geochemistry to provide a novel view of kinetics in the modern iron biogeochemical cycle, and the evolution of the iron cycle through geologic time. We start by considering t...

II. Photoreduction of Carbon Dioxide with Molecular Hydrogen............................... III. Photometabolism of Organic Compounds................................................. A. Photoproduction of Molecular Hydrogen............................................... B. The Stoichiometry of Hydrogen Production............................................ C. An Anaerobic Light-dependent Citric...

Heterotrophic microbial communities cycle nearly half of net primary productivity in the ocean, and play a particularly important role in transformations of dissolved organic carbon (DOC). The specific means by which these communities mediate the transformations of organic carbon are largely unknown, since the vast majority of marine bacteria have not been isolated in culture, and most measurem...

Diaphragm pumps often experience cavitation and subsequent fluid flow oscillation when delivering an organic in small/micro scale Rankine cycle (ORC). The behaviour of diaphragm has rarely been investigated for fluids so far. Three-dimensional, unsteady cavitating flows R245fa a pump were simulated with ANSYS 2019R2 CFX suction stroke terms the k -? turbulence model, ZGB rigid body motion model...

Temporary wetlands are short-term alternative ecosystems formed by flooding for irrigation of areas used for rice farming. The goal of this study is to describe the development cycle of rice fields as temporary wetlands in southern Brazil, evaluating how this process affect the gas production (CH4 and CO2) in soil with difference % carbon and organic matter content. Two areas adjacent to Lake M...

Organic Rankine cycle (ORC) power plants are considered as one of the most promising technologies to generate from low temperature heat sources such biomass combustion, industrial waste heat, geothermal and solar thermal energy. A feed pump is a key component an ORC plant circulate working fluid within system. Owing boiling organic fluids, pumps more vulnerable suffer cavitation. Cavitation in ...

As the main pathway for the ultimate preservation of terrigenous production in modern environments, the transfer of organic matter from the land to the oceans via fluvial systems is a key link in the global carbon cycle (Ittekot and Haake 1990; Degens et al. 1991; Hedges et al 1992). Hence, the “role” of rivers in the global carbon cycle is most typically expressed as the fluvial export of tota...

Organic Flash Cycle (OFC) has potential of improving efficiency for recovery of low temperature heat sources mainly due to reducing temperature mismatch in the heat exchanger. In this work exergetical performance analysis of ORC is conducted for recovery of low grade heat source. Effects of system parameters such as flash evaporation temperature or heating temperature are theoretically investig...