Results 311 to 320 of about 2,347,924 (407)

Mass Hierarchies and Quantum Gravity Constraints in DKMM‐refined KKLT

open access: yesFortschritte der Physik, Volume 71, Issue 1, January 2023., 2023
Abstract We carefully revisit the mass hierarchies for the KKLT scenario with an uplift term from an anti D3‐brane in a strongly warped throat. First, we derive the bound resulting from what is usually termed “the throat fitting into the bulk” directly from the Klebanov‐Strassler geometry.
Ralph Blumenhagen   +2 more
wiley   +1 more source

Sustainable Pathways for the Synthesis of Calcium Sulfate Hemihydrate

open access: yesAngewandte Chemie International Edition, EarlyView.
Calcium sulfate hemihydrate (bassanite) plays a key role in construction as a hydraulic binder. Due to its instability in water, industrial production primarily relies on thermal dehydration of gypsum. This review examines alternative, potentially more sustainable methods for the synthesis of bassanite, including gypsum conversion at lower temperatures
Selina Reigl   +5 more
wiley   +1 more source

Plastics of the Future? Interdisciplinary Review on Biobased and Biodegradable Polymers: Progress in Chemistry, Societal Views, and Environmental Implications

open access: yesAngewandte Chemie International Edition, Accepted Article.
Global demand to reduce polymer waste and microplastics pollution has increased in recent years, prompting further research, development, and wider use of biodegradable and biobased polymers (BBPs). BBPs have emerged as promising alternatives to conventional plastics, with the potential to mitigate the environmental burdens of persistent plastic waste.
Sara T. R. Velasquez   +5 more
wiley   +1 more source

α‐Amination of 1,3‐Dicarbonyl Compounds and Analogous Reactive Enolate‐Precursors Using Ammonia Under Oxidative Conditions

open access: yesAngewandte Chemie International Edition, Accepted Article.
We herein introduce a method for the direct a‐amination of different carbonyl compounds by employing aqueous ammonia as the N‐source. Upon using NH3 in combination with hypochlorites as simple oxidants under phase‐transfer catalytic conditions it is possible to carry out the direct a‐amination of reactive enolate‐precursors such as cyclic b‐ketoesters,
Christopher Mairhofer   +6 more
wiley   +1 more source

Topics in String Theory and Quantum Gravity

open access: green, 1992
Luis Álvarez-Gaumé   +1 more
openalex   +2 more sources

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