scholarly journals Molecular Models Illustrating Properties of Zeolites. Linde-Type Zeolite A, Selection of Alcohols, and Diphenylmethanol Etherification Product

2009 ◽  
Vol 86 (5) ◽  
pp. 656
Author(s):  
William F. Coleman
Keyword(s):  
Zeolite A ◽  
Molecular Models ◽  
Type Zeolite ◽  
Selection Of

Modeling circadian clocks: From equations to oscillations

2011 ◽  
Vol 6 (5) ◽  
pp. 699-711 ◽  
Author(s):  
Didier Gonze
Keyword(s):  
Genetic Network ◽  
Cellular Level ◽  
Circadian Clocks ◽  
Subsequent Paper ◽  
Molecular Models ◽  
Response Curves ◽  
Sustained Oscillations ◽  
Higher Eukaryotes ◽  
The Right ◽  
Selection Of

AbstractCircadian rhythms are generated at the cellular level by a small but tightly regulated genetic network. In higher eukaryotes, interlocked transcriptional-translational feedback loops form the core of this network, which ensures the activation of the right genes (proteins) at the right time of the day. Understanding how such a complex molecular network can generate robust, self-sustained oscillations and accurately responds to signals from the environment (such as light and temperature) is greatly helped by mathematical modeling. In the present paper we review some mathematical models for circadian clocks, ranging from abstract, phenomenological models to the most detailed molecular models. We explain how the equations are derived, highlighting the challenges for the modelers, and how the models are analyzed. We show how to compute bifurcation diagrams, entrainment, and phase response curves. In the subsequent paper, we discuss, through a selection of examples, how modeling efforts have contributed to a better understanding of the dynamics of the circadian regulatory network.

scholarly journals EU-7 zeolite: a synthetic BIK type zeolite with high hydrothermal stability

2018 ◽  
Vol 54 (44) ◽  
pp. 5626-5629
Author(s):  
Michiel De Prins ◽  
Elke Verheyen ◽  
Stef Kerkhofs ◽  
Andreas Hoffmann ◽  
Gina Vanbutsele ◽  
...  
Keyword(s):  
Hydrothermal Stability ◽  
Zeolite A ◽  
Type Zeolite ◽  
Denox Catalysis

EU-7 is identified as BIK topology and proves stable to withstand steaming at 900 °C relevant to DeNOx catalysis.

scholarly journals Distribution of Sodium Cations in Faujasite-Type Zeolite:  A Canonical Parallel Tempering Simulation Study

2004 ◽  
Vol 108 (1) ◽  
pp. 399-404 ◽  
Author(s):  
Christèle Beauvais ◽  
Xavier Guerrault ◽  
François-Xavier Coudert ◽  
Anne Boutin ◽  
Alain H. Fuchs
Keyword(s):  
Simulation Study ◽  
Parallel Tempering ◽  
Zeolite A ◽  
Sodium Cations ◽  
Type Zeolite

Photoluminescence of the Dehydrated Ag-type Zeolite A Packed under Air

2008 ◽  
Vol 77 (6) ◽  
pp. 064712 ◽  
Author(s):  
Hideoki Hoshino ◽  
Yusuke Sannohe ◽  
Yushi Suzuki ◽  
Takashi Azuhata ◽  
Takafumi Miyanaga ◽  
...  
Keyword(s):  
Zeolite A ◽  
Type Zeolite

Single, Binary and Ternary Ion Exchanged Zeolite as an Effective Bioactive Filler for Biomedical Polymer Composites

2012 ◽  
Vol 729 ◽  
pp. 234-239 ◽  
Author(s):  
Péter Kaali ◽  
György Czél
Keyword(s):  
Inhibitory Concentration ◽  
Zinc Nitrate ◽  
Ion Concentration ◽  
Zeolite A ◽  
Ion Release ◽  
Antimicrobial Efficiency ◽  
Type Zeolite ◽  
Zn Ions ◽  
Nitrate Solutions

The preparation and modelling of single, binary and ternary ion exchanged zeolites that express antimicrobial efficiency is discussed. As experimental material A type zeolite was used and different variations of Ag, Cu and Zn ions were incorporated into the crystal structure. Antimicrobial efficiency is based on the ion concentration and ion release of the zeolite, therefore the maximum cation-exchange capacities (CEC) were determined for each of the single ions. After the determination of CEC the preparation of binary and ternary ion-exchanged zeolite samples were prepared by the mixture of silver, copper and zinc nitrate solutions and the composition of the samples was determined by atomic absorption spectroscopy (AAS). To verify the bioactive effect, the minimum inhibitory concentration (MIC) of single, binary and ternary ion-exchanged zeolite A was determined for bacteria strains.

Synthesis of Zeolite A from Mongolian Coal Fly Ash by Hydrothermal Treatment

2018 ◽  
Vol 271 ◽  
pp. 1-8 ◽  
Author(s):  
Ulambayar Rentsenorov ◽  
Batmunkh Davaabal ◽  
Jadambaa Temuujin
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Cation Exchange Capacity ◽  
Coal Fly Ash ◽  
Batch Composition ◽  
Exchange Capacity ◽  
Zeolite Synthesis ◽  
Zeolite A ◽  
Acid Pretreatment ◽  
Type Zeolite

Raw coal fly ash and acid pretreated fly ash were used to synthesize A-type zeolite by hydrothermal treatment. In order to synthesize zeolite A an aqueous gel having a molar batch composition of Na2O:Al2O3:1.926SiO2:128H2O was utilized. Fly ash and zeolitic products were characterized by SEM, XRF, XRD and cation exchange capacity (CEC). After hydrothermal treatment, several types of zeolites were formed: zeolite A, analcime, faujasite and hydroxy-sodalite. The highest content of zeolite A was formed in the mixture treated at 80°C for 8 hours. CEC values of the zeolitic products were 28-38 times higher than that of in raw fly ash. Acid pretreatment which leads to low calcium and iron content is preferable method for processing of fly ash for the zeolite synthesis. Synthesized zeolite can be used for ion exchangers for water treatment.

Cation mobility upon adsorption of methanol in NaY faujasite type zeolite: A molecular dynamics study compared to dielectric relaxation experiments

2007 ◽  
Vol 141 (1) ◽  
pp. 113-116
Author(s):  
G. Maurin ◽  
D. Plant ◽  
S. Devautour-Vinot ◽  
A. Nicolas ◽  
F. Henn ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Dielectric Relaxation ◽  
Zeolite A ◽  
Cation Mobility ◽  
Type Zeolite ◽  
Relaxation Experiments

Molecular Motion of Ferrocene in a Faujasite-Type Zeolite:  A Quasielastic Neutron Scattering Study

2000 ◽  
Vol 104 (7) ◽  
pp. 1560-1562 ◽  
Author(s):  
E. Kemner ◽  
I. M. de Schepper ◽  
A. J. M. Schmets ◽  
H. Grimm ◽  
A. R. Overweg ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Molecular Motion ◽  
Zeolite A ◽  
Quasielastic Neutron ◽  
Type Zeolite ◽  
Scattering Study ◽  
Quasielastic Neutron Scattering ◽  
Neutron Scattering Study

scholarly journals In-situ XAFS study of Ag clusters in Ag-type zeolite-A

2014 ◽  
Vol 502 ◽  
pp. 012033 ◽  
Author(s):  
Atsushi Nakamura ◽  
Masataka Narita ◽  
Sho Narita ◽  
Yushi Suzuki ◽  
Takafumi Miyanaga
Keyword(s):  
Zeolite A ◽  
In Situ Xafs ◽  
Type Zeolite ◽  
Ag Clusters
Sign in / Sign up

Export Citation Format

Share Document