Research on Computer Simulation in Titanium Dioxide Photocatalytic Experiment

2014 ◽  
Vol 1049-1050 ◽  
pp. 64-68
Author(s):  
Xiao Bo Zhao
Keyword(s):  
Computer Simulation ◽  
Titanium Dioxide ◽  
Mutual Effect ◽  
Basic Structure ◽  
Main Method ◽  
Theoretical Simulation ◽  
Authentic Material ◽  
Catalytic Experiment

experiment is the basis of research on titanium dioxide (TiO2) photocatalysis. However, the proceeding of experiment need consume large amount of time, finance and vigor. Computer simulation realizes the mutual effect with outside by system of computer simulating authentic material, which can reduce unnecessary consumption. Computer simulation application provides new tool for TiO2 catalytic experiment and improve the efficiency. This paper summarized the basic structure of TiO2 as well as the mechanism and process of photocatalysis, introduced the main method and relative software of theoretical simulation mathematics, and summarized the advantage of computer simulation in micro field based on the limitation of experiment.

scholarly journals Inversion as the Concept of Communicative Grammar

2019 ◽  
pp. 62-83
Author(s):  
Iryna Aribzhanova
Keyword(s):  
Basic Structure ◽  
Final Position ◽  
Sentence Structure ◽  
Main Method ◽  
Middle Position ◽  
Communicative Structure ◽  
Syntactic Status ◽  
Simple Sentences

The article considers the problem of the syntactic status of inversion. The material of the research is the simple sentences-utterances of the Ukrainian language. The concept of communicative inversion and the concept of formal inversion are defined. These concepts reflect different aspects of the division of a sentence – by communicative components (for example, rheme + theme) and by the members of a sentence (for example, predicate + subject). Two meanings of the concept of communicative inversion are defined: firstly, communicative inversion is the intonational-positional transfer of the most important semantic-informational part of a sentence (or the words of the syntactic group, or syntagma) from the final position to the initial or middle position (method of forming the utterance); secondly, communicative inversion is a sentence structure opposed to the basic structure as a derivative (expressive utterance). Communicative analysis shows that formal inversion is functionally subordinated to the communicative structure of the sentence-utterance. It serves as the main method of forming contextually dependent utter-ances (changes the actual division of a sentence). Formal inversion is optional in expressive utterances. The result of the study is the classification of the main types of basic sentences-utterances and the methods of forming communicative inversion (full and partial) in the Ukrainian language. The typology is implemented according to the following principles: communicative non-division / division, contextual independence / dependence of utterances, correlation of communicative components with the members of a sentence or connections of the members of a sentence. The first type combines basic sentences-utterances with an undivided predicative group. The second type includes basic sentences with a divided predicative group.

Processing of experimental data for the separation of chromatographic signals of tetracycline group antibiotics by mathematical modeling

2020 ◽  
Vol 64 (12) ◽  
pp. 52-59
Author(s):  
Aisylu Z. Mukharlyamova ◽  
◽  
Aleksandr M. Saifutdinov ◽  
Elvira R. Rakhmetova ◽  
Aygul G. Mukhammetshina ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
High Performance ◽  
Basic Structure ◽  
Initial Value ◽  
Residual Concentration ◽  
Main Method ◽  
Preparation Conditions ◽  
High Concentrations ◽  
Tetracycline Group

Antibiotics belonging to the classes of sulfonamides, amphenicols and tetracyclines, such as tetracycline, oxytetracycline and chlortetracycline, are used to control infectious diseases of honeybees. In addition, tetracycline group antibiotics can be added directly to plants during flowering. Contamination of the flower with high concentrations of antibiotics entails the risk of transferring antibiotic residues to honey. Consequently, these antibiotics persist as contaminants in honey, and the determination of these drugs in honey samples is of great importance. Tetracyclines have a broad spectrum of activity against gram-positive and gram-negative bacteria. The basic structure of tetracyclines consists of a hydro-naphthacene framework containing four rings. Due to their possible toxic or allergic reactions and the possibility that pathogens may become resistant to these drugs, much attention has recently been paid to tetracyclines. For the detection of residual quantities of antibiotics in food products increasingly requires reliable analytical methods. The main method for determining tetracycline group antibiotics is the method of high-performance liquid chromatography, but the micro-quantities of their residual concentration and unsatisfactory chromatographic conditions, under which peaks may overlap, as well as insufficient sample preparation conditions, under which matrix components may overlap, make quantitative calculations difficult when using this method. This article describes a method for calculating the initial value of intesiveness and peak width using mathematical modeling. Based on the analysis of real chromatographic data, the applicability of this method for the quantitative determination of tetracycline group antibiotics is shown.

scholarly journals Crisis Management Modeling of an Economic Object in Conditions Associated with Risks

2021 ◽  
Vol 39 (7) ◽  
Author(s):  
Vitalina Babenko ◽  
Irina Babiy ◽  
Viktor Khelemskyi ◽  
Viktoriia Yevtushenko ◽  
Tetiana Manushkina ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Information System ◽  
Information Systems ◽  
Crisis Management ◽  
General Scheme ◽  
Quality Criteria ◽  
Main Method ◽  
Computer Information Systems ◽  
Lack Of Information ◽  
Model Of Management

The model of management of an economic object in a crisis is developed. Limitations and quality criteria are formed. General scheme of solving the task of minimax program crisis management at an enterprise is detected. The algorithm of the solution of the problem of crisis management of an enterprise taking into account the risks is offered. The main method for solving the problem is the method of detecting the reachable areas. Using this method, we work out the scenario of optimal crisis management in the presence of risks. The proposed algorithm allows to create effective numerous methods for implementing a computer simulation of solution of the problem of risk`s influencing. Simulated tools allow the reducing the risks at information system of crisis management of an enterprise. It opens the perspective of developing computer information systems for support of making effective crisis management decisions in the conditions of uncertainty and lack of information for increasing information security.

Design on a Novel Titanium Dioxide Irregularly Distributed Bragg Reflector for Thin Film Silicon Solar Cells

2020 ◽  
Vol 20 (8) ◽  
pp. 5096-5101
Author(s):  
Kejie Dai ◽  
Xuan Zhao
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Solar Cells ◽  
Silicon Dioxide ◽  
Bragg Reflector ◽  
Silicon Solar Cells ◽  
Distributed Bragg Reflector ◽  
Theoretical Simulation ◽  
Thin Film Silicon ◽  
Simulation Results

Titanium dioxide, which leads an excellent optical performance, is proposed to design irregularly distributed Bragg reflector (IDBR) through theoretical simulation as well as experimental verification. Firstly, a primary distributed Bragg reflector (DBR) model with the titanium dioxide serving as low reflection layer in, and amorphous silicon as high reflection layer is analyzed. The titanium dioxide DBR shows much enhanced reflection bandwidth relative to the DBR with silicon dioxide. A further study suggests that a traditional titanium dioxide IDBR demonstrate much enhanced performance versus the silicon dioxide IDBR with similar structure. Besides, the reflection bandwidth of the IDBR, especially in the high wavelength range, is dramatically promoted with respect to the DBR. Finally, a novel gradient IDBR model is developed. The simulation results reveal a higher reflection bandwidth of the titanium dioxide gradient IDBR than the silicon dioxide one. The reflectance of the titanium dioxide gradient IDBR is up to 90% in a range by 300 to 1450 nm. And, the reflection bandwidth of the gradient IDBR is much improved respect to the traditional IDBR. It seems that the titanium dioxide gradient IDBR could be an efficient selection for the thin film silicon solar cells. Finally, the gradient IDBR were fabricated via plasma enhanced chemical vapor deposition (PECVD) on a silicon wafer. A further test demonstrates a reflectance over 95% in the range from 400 to 1400 nm, and verifies the simulation results.

The Analysis and Evaluation Method of Network Performance and the Method Study of Computer Simulation

2014 ◽  
Vol 556-562 ◽  
pp. 5752-5755
Author(s):  
Rong Hua Tan
Keyword(s):  
Computer Simulation ◽  
Analytical Method ◽  
Network Performance ◽  
Evaluation Method ◽  
Computer Network ◽  
Simulation Method ◽  
Simulation Framework ◽  
Main Method ◽  
Analysis And Evaluation ◽  
Latency Jitter

Generally, the methods to evaluate network performance include analytical method, numerical method and simulation method. Nowadays, emulation is the main method to analyse computer network communication system. This paper discusses a general approach to evaluate network performance which includes bandwidth, latency, jitter, throughput and computer simulation method to analyse LAN performance. A network simulation framework is also introduced in this paper.

Microstructure and crystal symmetry of Pb2Sr2(Y/Ca)Cu3O9−δ

1990 ◽  
Vol 48 (4) ◽  
pp. 64-65
Author(s):  
Y. P. Lin ◽  
J. S. Xue ◽  
J. E. Greedan
Keyword(s):  
Electron Diffraction ◽  
High Temperature Superconductors ◽  
Carbon Film ◽  
Basic Structure ◽  
Crystal Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Space Groups ◽  
New Family ◽  
Convergent Beam

A new family of high temperature superconductors based on Pb2Sr2YCu3O9−δ has recently been reported. One method of improving Tc has been to replace Y partially with Ca. Although the basic structure of this type of superconductors is known, the detailed structure is still unclear, and various space groups has been proposed. In our work, crystals of Pb2Sr2YCu3O9−δ with dimensions up to 1 × 1 × 0.25.mm and with Tc of 84 K have been grown and their superconducting properties described. The defects and crystal symmetry have been investigated using electron microscopy performed on crushed crystals supported on a holey carbon film.Electron diffraction confirmed x-ray diffraction results which showed that the crystals are primitive orthorhombic with a=0.5383, b=0.5423 and c=1.5765 nm. Convergent Beam Electron Diffraction (CBED) patterns for the and axes are shown in Figs. 1 and 2 respectively.

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