Predicting photon cascade emission in Pr3+doped fluorides

2017 ◽  
Vol 19 (23) ◽  
pp. 15503-15511 ◽  
Author(s):  
Amador García-Fuente ◽  
Andrés Vega
Keyword(s):  
Theoretical Approach ◽  
Lanthanide Ion ◽  
Host Lattices ◽  
Cascade Emission ◽  
Ion Impurity ◽  
Photon Cascade Emission

We present a theoretical approach that allows for the determination of the complete electronic 4fnand 4fn−15d valence manifolds of a lanthanide ion impurity in different host lattices in an easy, fast and reliable way.

Polypeptides Folding: Rules for the Calculation of the Backbone Dihedral Angles φ starting from the Amino Acid Sequence

2020 ◽  
Author(s):  
Michele Larocca
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
Theoretical Approach ◽  
Polypeptide Chain ◽  
Hydrophobic Effect ◽  
Side Chain ◽  
Dihedral Angles ◽  
Mechanical Forces ◽  
Specific Chemical

<p>Protein folding is strictly related to the determination of the backbone dihedral angles and depends on the information contained in the amino acid sequence as well as on the hydrophobic effect. To date, the type of information embedded in the amino acid sequence has not yet been revealed. The present study deals with these problematics and aims to furnish a possible explanation of the information contained in the amino acid sequence, showing and reporting rules to calculate the backbone dihedral angles φ. The study is based on the development of mechanical forces once specific chemical interactions are established among the side chain of the residues in a polypeptide chain. It aims to furnish a theoretical approach to predict backbone dihedral angles which, in the future, may be applied to computational developments focused on the prediction of polypeptide structures.</p>

Direct Determination of Absolute Configuration of Methyl-Substituted Phenyloxiranes:  Combined Experimental and Theoretical Approach

2006 ◽  
Vol 110 (29) ◽  
pp. 9123-9129 ◽  
Author(s):  
Peter Fristrup ◽  
Peter R. Lassen ◽  
Christian Johannessen ◽  
David Tanner ◽  
Per-Ola Norrby ◽  
...  
Keyword(s):  
Absolute Configuration ◽  
Theoretical Approach ◽  
Direct Determination ◽  
Determination Of Absolute Configuration

On the sensitization of the Pr3+ Photon Cascade Emission by the 4fn−15d1 states of the Tm3+ and Nd3+ ions in YF3

2013 ◽  
Vol 36 (2) ◽  
pp. 346-351 ◽  
Author(s):  
A.M. Srivastava ◽  
S.J. Camardello ◽  
H.A. Comanzo ◽  
T.J. Sommerer ◽  
F. Garcia-Santamaria ◽  
...  
Keyword(s):  
Cascade Emission ◽  
Photon Cascade Emission

4f5d configuration and photon cascade emission of Pr3+ in solids

2007 ◽  
Vol 122-123 ◽  
pp. 58-61 ◽  
Author(s):  
Fangtian You ◽  
Shihua Huang ◽  
Chunxia Meng ◽  
Dawei Wang ◽  
Jianhua Xu ◽  
...  
Keyword(s):  
Cascade Emission ◽  
Photon Cascade Emission

THEORETICAL APPROACH TO DETERMINATION OF ACOUSTIC PROPERTIES OF BUILDING MATERIALS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Lukáš Fiala ◽  
Robert Černý
Keyword(s):  
Theoretical Approach ◽  
Urban Areas ◽  
Building Materials ◽  
Construction Materials ◽  
Well Being ◽  
Acoustic Properties ◽  
Solid Matrix ◽  
Sound Waves ◽  
Acoustic Load

The presence of high level of acoustic load especially in urban areas is becoming a serious problem in the present. In order to protect people against adverse effects of audio noise on health and personal well-being in buildings located in such areas, convenient construction materials with sophisticated geometric arrangement should be used. Bearing structures of new houses in the Czech Republic are widely made of different types of brick blocks. Such brick blocks consist of solid matrix and cavities designed in an optimized geometrical way in order to assure better thermal and hygric properties. Previous studies dealing both with acoustic properties in an empirical way and with the theoretical aspects of acoustic attenuation in building materials were not very numerous. Nevertheless, they gain constantly in importance with increasing acoustic load of the buildings surroundings. In this paper, a theoretical approach for the determination of acoustic properties, which is convenient for the description of sound waves propagation in building materials, is introduced.

SrAl12O19:Pr3+ nanodisks and nanoplates: New processing technique and photon cascade emission

2009 ◽  
Vol 24 (5) ◽  
pp. 1771-1779
Author(s):  
Zhaogang Nie ◽  
Jiahua Zhang ◽  
Xia Zhang ◽  
Ki-Soo Lim
Keyword(s):  
Large Particle ◽  
Low Cost ◽  
Blue Shift ◽  
Processing Technique ◽  
Large Particle Size ◽  
Modified Polymer ◽  
New Processing ◽  
Cascade Emission ◽  
First Time ◽  
Photon Cascade Emission

High-quality SrAl12O19:Pr3+ nanodisks and nanoplates were fabricated via a new processing technique based on a modified polymer steric entrapment method. Serious agglomeration and large particle size distribution of final products, which usually occurred in the conventional method, were eliminated completely. The effects of new synthetic processes on the morphology, crystallization, and yield of products and the relevant mechanisms were discussed. As far as we know, SrAl12O19:Pr3+ nanodisks with mean diameter ∼60 nm and thickness between 5 and 10 nm were successfully synthesized for the first time by this low-cost technique. The new synthetic method may provide a general route to synthesize other refractory mixed-oxide nanocrystals. Photon cascade emission involving transitions 1S0–1I6 followed by 3P0–3H4 in SrAl12O19:1% Pr3+ nanodisks was investigated. Size-effect-induced blue shift of the 4f5d states of Pr3+ was observed in SrAl12O19:1% Pr3+ nanodisks, in which the quantum efficiency was preserved, as in the bulk counterparts.

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