[structure: see text] A novel (two-zone process with different spin-state channels) mechanistic picture for the Jacobsen-Katsuki reaction is presented that provides insight into the still elusive understanding of the epoxidation mechanism. For the first time, we show that the salen moiety of the catalyst can be explicitly involved in the epoxidation process.
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http://dx.doi.org/10.1021/ol036051t | DOI Listing |
Huan Jing Ke Xue
May 2024
School of Ecology and Environment, Ningxia University, Yinchuan 750021, China.
The objective of this study was to explore the effects of different amounts of biochar on the migration process and characteristics of NO-N in loessial soil. In this study, six groups of mixed soil samples with biochar and loessial soil mass ratios of 0% (T0), 1% (T1), 2% (T2), 3% (T3), 4% (T4), and 5% (T5) were used as research objects. NO-N was used as the tracer.
View Article and Find Full Text PDFCogn Affect Behav Neurosci
February 2024
School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA.
The mechanisms for how large-scale brain networks contribute to sustained attention are unknown. Attention fluctuates from moment to moment, and this continuous change is consistent with dynamic changes in functional connectivity between brain networks involved in the internal and external allocation of attention. In this study, we investigated how brain network activity varied across different levels of attentional focus (i.
View Article and Find Full Text PDFWater Res
November 2023
College of Science and Engineering, James Cook University, Douglas, QLD 4811, Australia. Electronic address:
Phosphorus recovery from human waste will help assure global food security, reduce environmental impact, and ensure effective stewardship of this limited and valuable resource. This can be accomplished by the precipitation of struvite (MgNHPO·6HO) in a two-zone reactor, continuously fed with nutrient-rich hydrolysed urine and a magnesium solution. The solid struvite crystals are periodically "harvested", removing accumulated crystal mass - and therefore recovered nutrients - from the process, and the operating campaign can, in principle, be continuously operated in a batch-continuous operating mode.
View Article and Find Full Text PDFInorg Chem
May 2023
College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China.
LiGaInSe is a new quaternary nonlinear optical crystal for the mid-IR application grown as a mixed crystal of the LiGaSe-LiInSe solid-solution system. It is transparent in the 0.47-14 μm range and has an appropriate bandgap and a lower melting point than LiGaSe and LiInSe.
View Article and Find Full Text PDFRSC Adv
March 2023
Department of Mechanical & Industrial Engineering, Indian Institute of Technology Roorkee Roorkee - 247 667 India
A robust mathematical model is developed for prediction and optimization of syngas in a downdraft gasifier. The gasifier is modelled for two distinct zones pyro-oxidation zone (zone I) and reduction zone (zone II). A thermodynamic equilibrium model is implemented for the prediction of syngas composition in zone I, while zone II is modelled by implementing a finite kinetic approach.
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