Model prediction of the purification time when PM2.5 is removed unevenly by an air purifier

2021 ◽  
pp. 1-22
Author(s):  
WuFeng Jin ◽  
Cheng Wang ◽  
BongSoo Choi ◽  
JingDa Ma ◽  
JiaJun Jing ◽  
...  
Keyword(s):  
Model Prediction ◽  
Purification Time ◽  
Air Purifier

scholarly journals Prediction of PM2.5 Purification Time of Air Purifier under High Elevation Angle and High Wind Speed

2021 ◽  
Vol 257 ◽  
pp. 01081
Author(s):  
WuFeng Jin ◽  
Cheng Wang ◽  
Chong Shi ◽  
Zhiqiang Wang
Keyword(s):  
Prediction Model ◽  
Elevation Angle ◽  
Influence Factors ◽  
High Elevation ◽  
Linear Regression Method ◽  
Simulation Research ◽  
Multiple Linear Regression Method ◽  
Purification Time ◽  
Air Purifier ◽  
The Relationship

In order to achieve the best purification effect of PM2.5 at different personnel positions, it is necessary to study the PM2.5 purification time at different personnel positions in the room when the influence factors change, and establish a prediction model of the purification time.In this paper, air purifier and room models were established for simulation research. Purification time of air purifier at different locations in the room was taken as regression data, and multiple linear regression method was adopted to obtain the relationship between each impact factor and PM2.5 purification time, and a prediction model of PM2.5 purification time at different personnel locations in the room was proposed.The results of this study provide a theoretical basis for putting forward the whole intelligent scheme of air purifier.

Turnaround Model Prediction with Content Dimension on Financial Distress Firms

2020 ◽  
Vol 11 (1) ◽  
pp. 65-65
Author(s):  
Giriati
Keyword(s):  
Family Member ◽  
Model Prediction ◽  
Significant Relationship ◽  
Financial Distress ◽  
Stock Exchange ◽  
Organization Change ◽  
Least Square ◽  
Ordinary Least Square ◽  
Change Framework

This article aims to synthesize and test empirically turnaround model by content dimension that is an integration of the organization change framework into turnaround research to measure some activities done to avoid failure in turnaround. This study on the Indonesian Stock Exchange (BEI) by using Ordinary Least Square technique. The results of the analysis from content dimension show that the CEO expertise variable has a significant relationship to turnaround, since companies in Indonesia are dominated by family companies, so maintaining the incumbent CEO is more appropriate, because it is a family member. In addition, free assets show a significant relationship with turnaround, while leverage and growth of sales do not have a significant relationship with turnaround. Keywords: Financial Distress, Turnaround Model, CEO Expertise, Free Assets, Leverage and Growth of Sales,

APPLICATION OF TITANIUM OXIDE COATINGS FOR NEUTRALIZATION OF HAZARDOUS CHEMICAL SUBSTANCES

2019 ◽  
Vol 2 (12) ◽  
pp. 131-136
Author(s):  
О. Halak ◽  
N. Poltorak ◽  
О. Kravchuk ◽  
V. Synko ◽  
Y. Korol
Keyword(s):  
Ultraviolet Rays ◽  
Gaseous Emissions ◽  
Oxide Coatings ◽  
Mobile Objects ◽  
Hazardous Chemical ◽  
Catalytic Material ◽  
Air Purifier ◽  
Domestic Use ◽  
Purification Methods ◽  
Plasma Electrolytic

Contamination of hazardous chemicals is currently considered one of the major environmental problems. The methods of purification of gaseous emissions depending on the physicochemical properties of pollutants, in particular dangerous chemical, their aggregate state, concentration in the gas environment are studied in this article. The effect of aerosol content such as dust and soot is analyzed as well as the efficiency of purification methods at different temperature intervals, methods of purification of multicomponent mixtures. The comparative characteristics of thermochemical, reagent, sorption and catalytic methods are given and the prospects of their application in filtering systems of stationary and mobile objects are evaluated. It has been proved that almost any organic compounds can be oxidized (mineralized) on the TiO2surface. In practice, any photocatalytic air purifier includes a porous TiO2 deposited carrier, which is irradiated with ultraviolet rays and through which air is purged. Photocatalysis is suitable for domestic use as it can occur at room temperature. For example, a thermocatalytic method of destroying harmful substances requires preheating the air to a temperature above 200 ° C. Photocatalysis destroys substances that penetrate even through activated carbon filters. Features of formation of oxide coatings by plasma-electrolytic oxidation of titanium alloys are considered. It is proposed to refine the design of collective defense systems on armored vehicles and stationary facilities with additional installation in the filter-absorber of the grid with the deposited layer of catalytic material, which will neutralize various types of dangerous chemicals due to photocatalytic air purification.

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