Results 41 to 50 of about 339,529 (309)

Spatial and temporal variations of fractionation of stable isotopes in East-Antarctic snow

Journal of Glaciology, 2021
Stable isotope ratios (δ18O and δD) in Antarctic snow and ice are basic proxy indices of climate in ice core studies. The relation between the ratios has important indicative significance for moisture sources.
Chuanjin Li, Jiawen Ren, Guitao Shi, Hongxi Pang, Yetang Wang, Shugui Hou, Zhongqin Li, Zhiheng Du, Minghu Ding, Xiangyu Ma, Jiao Yang, Aihong Xie, Puyu Wang, Xiaoming Wang, Bo Sun, Cunde Xiao   +15 more
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A novel binary particle fractionation technique [PDF]

, 2009
An interesting development towards a robust particle fractionator is presented. Typically acoustic fractionators rely on time of flight in a constant acoustic field to separate different populations .
Boltryk, R.J., Hill, M., Harris, N.R., Glynne-Jones, P., Harris, Nick, Hill, Martyn, Glynne-Jones, Peter, Boltryk, Rosemary   +7 more
core   +1 more source

Effect of Operating Conditions and Fructans Size Distribution on Tight Ultrafiltration Process for Agave Fructans Fractionation: Optimization and Modeling

Membranes, 2022
The objective of this work was to evaluate the effect of operating conditions and fructans size distribution on the tight Ultrafiltration process for agave fructans fractionation.
Noe Luiz-Santos, Rogelio Prado-Ramírez, Rosa María Camacho-Ruíz, Guadalupe María Guatemala-Morales, Enrique Arriola-Guevara, Lorena Moreno-Vilet   +5 more
doaj   +1 more source

Coherence fraction

Quantum Information Processing, 2019
The concept of entanglement fraction is generalized to define coherence fraction of a quantum state. Precisely, it quantifies the proximity of a quantum state to maximally coherent state and it can be used as a measure of coherence. Coherence fraction has a connection with $l_1$-norm coherence and provides the criteria of coherence distillability ...
Sumana Karmakar, Ajoy Sen, Indrani Chattopadhyay, Amit Bhar, Debasis Sarkar   +4 more
openaire   +2 more sources

Using Fractionation and Diffusion Ordered Spectroscopy to Study Lignin Molecular Weight.

ChemistryOpen, 2019
Recent reports demonstrate that applications of the biopolymer lignin can be helped by the use of a fraction of the lignin which has an optimal molecular weight range.
James R. D. Montgomery, Priory Bazley, Dr. Tomas Lebl, Prof. Nicholas J. Westwood   +3 more
doaj   +1 more source

Atrial Electrogram Fractionation Distribution before and after Pulmonary Vein Isolation in Human Persistent Atrial Fibrillation—A Retrospective Multivariate Statistical Analysis

Frontiers in Physiology, 2017
Purpose: Complex fractionated atrial electrograms (CFAE)-guided ablation after pulmonary vein isolation (PVI) has been used for persistent atrial fibrillation (persAF) therapy.
Tiago P. Almeida, Tiago P. Almeida, Gavin S. Chu, Xin Li, Nawshin Dastagir, Jiun H. Tuan, Peter J. Stafford, Fernando S. Schlindwein, Fernando S. Schlindwein, G. André Ng, G. André Ng, G. André Ng   +11 more
doaj   +1 more source

Fractional hypergraph isomorphism and fractional invariants

CoRR, 2020
Fractional graph isomorphism is the linear relaxation of an integer programming formulation of graph isomorphism. It preserves some invariants of graphs, like degree sequences and equitable partitions, but it does not preserve others like connectivity, clique and independence numbers, chromatic number, vertex and edge cover numbers, matching number ...
Flavia Bonomo-Braberman, Dora Tilli
openaire   +3 more sources

Fractional Differential Equations and Expansions in Fractional Powers

Symmetry, 2023
We use power series with rational exponents to find exact solutions to initial value problems for fractional differential equations. Certain problems that have been previously studied in the literature can be solved in a closed form, and approximate solutions are derived by constructing recursions for the relevant expansion coefficients.
Diego Caratelli, Pierpaolo Natalini, Paolo Emilio Ricci   +2 more
openaire   +3 more sources

Silicon isotope fractionation during abiotic silica precipitation at low temperatures: Inferences from flow-through experiments [PDF]

, 2014
Silicon isotopes have considerable potential as proxy for (near-) surface processes and environmental conditions. However, unambiguous interpretations of isotope signatures in natural silica deposits are often hampered by a lack of independent ...
van Bergen, M.J., Roerdink, Desiree L., van Cappellen, P.H., Van Cappellen, Philippe, NWO-NSO: Testing the robustness of the sulfur stable isotope biomarker and paleoredox indicator for planetary exploration, van Bergen, Manfred J., Roerdink, D.L., Vroon, Pieter Z., Petrology, Geilert, Sonja, NWO-ALW Open: Exploring the Earth's earliest oceans with silicon: magnitudes of isotopic fractionation, Vroon, P.Z.; id_orcid, Geilert, S., Vroon, P.Z.   +13 more
core   +1 more source

Theoretical analysis of the dose dependence of the oxygen enhancement ratio and its relevance for clinical applications

Radiation Oncology, 2011
Background The increased resistance of hypoxic cells to ionizing radiation is usually believed to be the primary reason for treatment failure in tumors with oxygen-deficient areas.
Wenzl Tatiana, Wilkens Jan J
doaj   +1 more source