scholarly journals Dynamic Light Scattering by Foamed Polymers during Preparation of Scaffold Prototypes: Events Statistics Analysis versus Evaluation of Correlation Time in Data Interpretation

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 549
Author(s):  
Dmitry Zimnyakov ◽  
Marina Alonova ◽  
Ekaterina Ushakova ◽  
Olga Ushakova ◽  
Anna Isaeva ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Correlation Time ◽  
A Priori ◽  
Time Derivative ◽  
Data Interpretation ◽  
Interphase Boundaries ◽  
Intensity Fluctuations ◽  
Priori Information ◽  
The Time Domain

Polylactide foaming as the key stage in laboratory preparation of highly porous biocompatible matrices used as scaffold prototypes was monitored based the effect of dynamic light scattering in expanding polylactide foams. Intensity fluctuations of scattered laser radiation in the course of foam expansion were analyzed using ensemble-averaged estimates of the speckle lifetime within a running window in the time domain. It was found that, in contrast to the commonly used correlation time of intensity fluctuations, the values of the average speckle lifetime are invariant with respect to the type of dynamics of phase fluctuations of partial components in scattered radiation. This makes it possible to relate this parameter to microscopic mobility of interphase boundaries in the foam in the absence of a priori information on the law of motion relating these boundaries at the microscopic level. The proposed approach in combination with the developed phenomenological model describing the relationship between the average speckle lifetime and the current values of the foam volume, as well as its first-time derivative made it possible to interpret the features of foam structure formation.

scholarly journals Special aspects of using a new non-stationary random processes analysis approach in the conditions of a priori uncertainty of the useful signal function

2019 ◽  
Vol 30 ◽  
pp. 03002
Author(s):  
Vladimir Marchuk
Keyword(s):  
Additive Noise ◽  
High Efficiency ◽  
A Priori ◽  
Statistical Characteristics ◽  
Signal Function ◽  
Useful Signal ◽  
Priori Information ◽  
The Time Domain ◽  
A Priori Uncertainty ◽  
Stationary Random Processes

The paper considers the use of a new method of signal processing in the time domain under conditions of a limited amount of a priori information about the useful signal function and the statistical characteristics of additive noise. Research have shown its high efficiency in processing signals both local and global, using it to detect anomalous measurements, eliminating the systematic component in the case of a onesided law of the distribution of additive noise and a number of others.

Correlation time of density fluctuation for supercritical ethylene studied by dynamic light scattering

2002 ◽  
Vol 116 (12) ◽  
pp. 4985 ◽  
Author(s):  
Ken-ichi Saitow ◽  
Hiroto Ochiai ◽  
Tadashi Kato ◽  
Keiko Nishikawa
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Correlation Time ◽  
Density Fluctuation

scholarly journals A priori estimations of geometric parameters of an anomalous object in modeling the soil structure using RES3DINV software

2020 ◽  
Vol 30 (4) ◽  
pp. 696-710
Author(s):  
O.M. Nemtsova ◽  
T.M. Bannikova ◽  
V.M. Nemtsov
Keyword(s):  
Data Analysis ◽  
A Priori ◽  
Data Interpretation ◽  
Geometric Parameters ◽  
Inversion Method ◽  
A Priori Information ◽  
Input Parameters ◽  
Uniqueness Of The Solution ◽  
Ill Posed ◽  
Priori Information

We discuss the problem of proper use of software packages that implement methods for solving ill-posed problems. Most of the problems of processing experimental data belong to ill-posed problems. When using methods for solving ill-posed problems, there is a problem of non-uniqueness of the solution, which is solved by introducing a priori information. Obtaining a priori information is possible in different ways, but quantitative estimates involve the use of additional methods for data analysis. Obviously, additional methods should not be more complicated and labor intensive than the main data processing method. Using the RES3DINV electrical prospecting data analysis software as an example, the role of a priori information for obtaining reliable results is demonstrated. The RES3DINV software is used to build a soil model from the measured values of resistivity using electrical survey’s methods. When using the inversion method implemented in the software package, it is necessary to set the input parameters describing the geometric dimensions of the anomalous resistance object, which are usually unknown a priori. By model objects we demonstrate how the incorrect setting of input parameters affects the result of data interpretation. We show that the vector analysis method can be used as a way to obtain a priori information. This method allows us to obtain estimates of the geometric parameters of an anomalous object, does not involve high time and resource expenses, and can be used directly at the site of field experimental measurements.

Dynamic light scattering from gels in a poor solvent

1978 ◽  
Vol 39 (9) ◽  
pp. 955-960 ◽  
Author(s):  
E. Geissler ◽  
A.M. Hecht
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Poor Solvent

Innovative Approach to Information Search by Example of a Patent Analysis of an Important Substitution Plan

2020 ◽  
pp. 143-157
Author(s):  
Maria A. Milkova
Keyword(s):  
Information Search ◽  
Topic Modeling ◽  
Cognitive Biases ◽  
A Priori ◽  
Import Substitution ◽  
Innovative Approach ◽  
Iterative Search ◽  
Comprehensive Picture ◽  
Priori Information ◽  
Selection Of

Nowadays the process of information accumulation is so rapid that the concept of the usual iterative search requires revision. Being in the world of oversaturated information in order to comprehensively cover and analyze the problem under study, it is necessary to make high demands on the search methods. An innovative approach to search should flexibly take into account the large amount of already accumulated knowledge and a priori requirements for results. The results, in turn, should immediately provide a roadmap of the direction being studied with the possibility of as much detail as possible. The approach to search based on topic modeling, the so-called topic search, allows you to take into account all these requirements and thereby streamline the nature of working with information, increase the efficiency of knowledge production, avoid cognitive biases in the perception of information, which is important both on micro and macro level. In order to demonstrate an example of applying topic search, the article considers the task of analyzing an import substitution program based on patent data. The program includes plans for 22 industries and contains more than 1,500 products and technologies for the proposed import substitution. The use of patent search based on topic modeling allows to search immediately by the blocks of a priori information – terms of industrial plans for import substitution and at the output get a selection of relevant documents for each of the industries. This approach allows not only to provide a comprehensive picture of the effectiveness of the program as a whole, but also to visually obtain more detailed information about which groups of products and technologies have been patented.

DYNAMIC LIGHT SCATTERING IN LC-440 NEMATIC LIQUID CRYSTAL

2014 ◽  
Vol 73 (11) ◽  
pp. 977-983
Author(s):  
A. P. Fedoryako ◽  
A. I. Kocherzhin ◽  
M. P. Kukhtin ◽  
E. I. Chernyakov
Keyword(s):  
Liquid Crystal ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Nematic Liquid Crystal
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