Results 41 to 50 of about 388,039 (180)

Highlighting the effects of co‐eluting interferences on compound specific stable isotope analysis of polycyclic aromatic hydrocarbons using comprehensive two‐dimensional gas chromatography [PDF]

, 2014
Accuracy is the most important issue when carrying out compound specific stable isotope analysis of polycyclic aromatic hydrocarbons extracted from complex samples.
Blessing, Buczyńska, Elsner, Gauchotte-Lindsay, Graham, Liu, Mansuy, Mazeas, McGregor, McGregor, McRae, Meier-Augenstein, Pashin, Philp, Philp, Saber, Steinbach   +16 more
core   +1 more source

Isotope Effect and Isotope Separation

Nippon kagaku zassi, 1968
同位体物質の換算分配関数比の値を, 量子統計論に基づき, 分子振動スペクトルからの知見を用いて算定した。これらの結果は同位体分離の研究に一つの基礎を与える。同位体物質が二相に分配するとき, 化学反応が同位体の分離効果にどのような影響をおよぼすかについて理論的な考察(二相分配理論) を行なった。導出された基礎式から, どのような系がもっとも分離効果が大きいかを知ることができる。二三の簡単な系について, この理論を展開した。さらにイオン交換樹脂を用いて, 実際にリチウム, 窒素, 銅, ウラン同位体の分離実験を行ない, 相分配理論によって解析を試みた。
openaire   +2 more sources

Impact of the isotope effect on divertor detachment and pedestal structure in DIII-D

Nuclear Fusion
Dedicated H-mode hydrogen experiments has been conducted at DIII-D and are compared to a similar deuterium dataset under a range of divertor conditions, revealing significant effects of the isotope mass on divertor conditions and pedestal behavior.
R. Mattes, L. Casali, T. Osborne, A. Leonard, H. Wang, F. Laggner, M. Groth, C. Lasnier, A. McLean   +8 more
doaj   +1 more source

Theoretical Study of H/D Isotope Effects on Nuclear Magnetic Shieldings Using an ab initio Multi-Component Molecular Orbital Method

Molecules, 2013
We have theoretically analyzed the nuclear quantum effect on the nuclear magnetic shieldings for the intramolecular hydrogen-bonded systems of σ-hydroxy acyl aromatic species using the gauge-including atomic orbital technique combined with our multi ...
Masanori Tachikawa, Takayoshi Ishimoto, Taro Udagawa   +2 more
doaj   +1 more source

Accelerating equilibrium isotope effect calculations: I. Stochastic thermodynamic integration with respect to mass [PDF]

, 2017
Accurate path integral Monte Carlo or molecular dynamics calculations of isotope effects have until recently been expensive because of the necessity to reduce three types of errors present in such calculations: statistical errors due to sampling, path ...
Karandashev, Konstantin, Vanicek, Jiri
core   +2 more sources

Ab initio simulations of hydrogen-bonded ferroelectrics: collective tunneling and the origin of geometrical isotope effects

, 2013
Ab initio simulations that account for nuclear quantum effects have been used to examine the order-disorder transition in squaric acid, a prototypical H-bonded antiferroelectric crystal.
Michaelides, A., Wikfeldt, K. T.
core   +1 more source

Nitrogen isotope effects can be used to diagnose N transformations in wastewater anammox systems

Scientific Reports, 2021
Anaerobic ammonium oxidation (anammox) plays an important role in aquatic systems as a sink of bioavailable nitrogen (N), and in engineered processes by removing ammonium from wastewater.
Paul M. Magyar, Damian Hausherr, Robert Niederdorfer, Nicolas Stöcklin, Jing Wei, Joachim Mohn, Helmut Bürgmann, Adriano Joss, Moritz F. Lehmann   +8 more
doaj   +1 more source

Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas

Nuclear Fusion
Recent JET D–T campaigns opened the possibility of unique isotope studies to investigate the L–H transition physics in view of reactor plasmas and to study the origin of the observed power threshold minimum.
P. Vincenzi, E.R. Solano, E. Delabie, C. Angioni, G. Birkenmeier, C. Maggi, R.B. Morales, H.J. Sun, E. Tholerus, JET Contributors   +9 more
doaj   +1 more source

Bacterial and abiogenic carbonates formed in caves-no vital effect on clumped isotope compositions.

PLoS ONE, 2021
Speleothems (dominated by cave-hosted carbonate deposits) are valuable archives of paleoclimate conditions. As such, they are potential targets of clumped isotope analyses that may yield quantified data about past temperature variations.
Attila Demény, László Rinyu, Péter Németh, György Czuppon, Nóra Enyedi, Judit Makk, Szabolcs Leél-Őssy, Dóra Kesjár, Ivett Kovács   +8 more
doaj   +1 more source

Giant isotope effect and spin state transition induced by oxygen isotope exchange in ($Pr_{1-x}Sm_x)_{0.7}Ca_{0.3}CoO_3$

, 2006
We systematically investigate effect of oxygen isotope in $(Pr_{1-x}Sm_x)_{0.7}Ca_{0.3}CoO_3$ which shows a crossover with x from ferromagnetic metal to the insulator with spin-state transition.
C. H. Wang, G. M. Zhao, G. Wu, G. Y. Wang, I. B. Bersuker, T. Wu, X. G. Luo, X. H. Chen   +7 more
core   +1 more source