Results 31 to 40 of about 12,174,017 (385)
The Depositional Record, 2023 Two cap carbonates overlying Cryogenian panglacial deposits are found in North‐East Svalbard of which the younger (635 Ma) forms the base of the Ediacaran Period.
Ian J. Fairchild +3 more
doaj +1 more source
Quantum fluctuations and isotope effects in ab initio descriptions of water. [PDF]
Journal of Chemical Physics, 2014 Isotope substitution is extensively used to investigate the microscopic behavior of hydrogen bonded systems such as liquid water. The changes in structure and stability of these systems upon isotope substitution arise entirely from the quantum mechanical
Lu Wang, Michele Ceriotti, T. Markland
semanticscholar +1 more source
Probing Ionic Liquid Aqueous Solutions Using Temperature of Maximum Density Isotope Effects
Molecules, 2013 This work is a new development of an extensive research program that is investigating for the first time shifts in the temperature of maximum density (TMD) of aqueous solutions caused by ionic liquid solutes.
Mohammad Tariq +3 more
doaj +1 more source
A Spectroscopic Overview of Intramolecular Hydrogen Bonds of NH…O,S,N Type
Molecules, 2021 Intramolecular NH…O,S,N interactions in non-tautomeric systems are reviewed in a broad range of compounds covering a variety of NH donors and hydrogen bond acceptors. 1H chemical shifts of NH donors are good tools to study intramolecular hydrogen bonding.
Poul Erik Hansen
doaj +1 more source
Scientific Reports, 2021 Investigation of isotope effects on superconducting transition temperature (T c) is one of the useful methods to examine whether electron–phonon interaction is essential for pairing mechanisms. The layered BiCh2-based (Ch: S, Se) superconductor family is
Aichi Yamashita +5 more
doaj +1 more source
The isotopic composition of methane in the stratosphere : high-altitude balloon sample measurements [PDF]
, 2011 The isotopic composition of stratospheric methane has been determined on a large suite of air samples from stratospheric balloon flights covering subtropical to polar latitudes and a time period of 16 yr.
Borchers, Reinhard +3 more
core +1 more source
Isotope effects and possible pairing mechanism in optimally doped cuprate superconductors
, 2002 We have studied the oxygen-isotope effects on T_{c} and in-plane penetration depth \lambda_{ab}(0) in an optimally doped 3-layer cuprate Bi_{1.6}Pb_{0.4}Sr_{2}Ca_{2}Cu_{3}O_{10+y} (T_{c} \sim 107 K).
A. Bill +27 more
core +1 more source
Molecules, 2013 Much of our understanding of the mechanisms of enzyme-catalyzed reactions is based on steady-state kinetic studies. Experimentally, this approach depends solely on the measurement of rates of free product appearance (d[P]/dt), a mechanistically and ...
Harvey F. Fisher
doaj +1 more source
, 2002 We use a recently developed formalism (combining an adiabatic expansion and dynamical mean-field theory) to obtain expressions for isotope effects on electronic properties in correlated systems.
A. Deppeler +31 more
core +1 more source
NMR and IR Investigations of Strong Intramolecular Hydrogen Bonds
Molecules, 2017 For the purpose of this review, strong hydrogen bonds have been defined on the basis of experimental data, such as OH stretching wavenumbers, νOH, and OH chemical shifts, δOH (in the latter case, after correction for ring current effects). Limits for O–H·
Poul Erik Hansen, Jens Spanget-Larsen
doaj +1 more source