A comparative analysis on physical and chemical plasma cleaning effects on surfaces

2013 ◽  
Author(s):  
Wong Jun Hao ◽  
Lim Yuan Ming
Keyword(s):  
Comparative Analysis ◽  
Plasma Cleaning ◽  
Physical And Chemical

scholarly journals Comparative Analysis of Gearboxes Wear in Excavators and Mining Trucks

2020 ◽  
Vol 174 ◽  
pp. 03017
Author(s):  
Andrey Kudrevatykh ◽  
Andrey Ashcheulov ◽  
Alena Ashcheulova ◽  
Kumis Urazbaeva
Keyword(s):  
Comparative Analysis ◽  
Mining Industry ◽  
Technical Condition ◽  
Used Oil ◽  
Dump Trucks ◽  
Wear Products ◽  
High Level ◽  
Physical And Chemical ◽  
Metallic Impurities

The primary task of all enterprises in mining industry is to increase the durability and reliability of the mining complex. These very indicators provide nonstop minerals mining, and as a result, productivity increases. Indicators maintaining at high level can be achieved by different ways, but the most effective method is repair-in-place diagnosis of the actual technical condition of the main units and assemblies of equipment, as it is less costly and the most informative. To identify gear malfunctions, the physical and chemical analysis of the used oil is used to determine metallic impurities. A comparative analysis of wear products accumulation in rotary gears of mining excavators and gearboxes of the motor-wheel of dump trucks revealed the similarity of mathematical models for the determination of metallic impurities in used oil. The “universal” mathematical model is given in the paper; it allows to determine the actual technical condition of gearboxes for various equipment with a few assumptions. Moreover, the model takes into account various indicators of the environment, used oil, as well as the operating parameters of the equipment.

scholarly journals Comparative analysis of gynaecological status of workers from textile and metal industry

2008 ◽  
Vol 136 (3-4) ◽  
pp. 131-135 ◽  
Author(s):  
Aleksandar Milovanovic ◽  
Jelena Dotlic ◽  
Branko Jakovljevic ◽  
Jovica Milovanovic ◽  
Slavica Petkovic ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Inflammatory Diseases ◽  
Metal Industry ◽  
Textile Workers ◽  
Work Time ◽  
Metal Workers ◽  
Female Workers ◽  
Chemical Hazards ◽  
Significant Difference ◽  
Physical And Chemical

Introduction Female workers in textile and metal industry are exposed to various physical and chemical hazards that can lead to the occurrence of gynaecological diseases. Objective The aim of this study was to estimate the frequency of gynaecological diseases among workers of textile and metal industries. METHOD The investigation comprised 197 female workers, 148 from textile and 49 from metal industry, aged from 26 to 57 years. All subjects were hospitalized based on non-gynaecological diagnoses. Gynaecological diagnoses included: tumours of the genital organs and breasts, cervical ectopy and lacerations, inflammatory diseases, disturbances of static of genital organs, cysts, and irregularities of menstrual cycle. Results Textile workers were significantly younger than metal workers, but the groups were comparable according to total and exposure work-time, qualifications and diagnosis on hospital admission. Gynaecological diseases were diagnosed among all investigated subjects. About 80% were diagnosed with tumours and inflammatory diseases. A highly statistically significant difference was observed among groups according to the presence of cervical ectopy and lacerations, which were more frequent among textile workers. Conclusion Comparison of gynaecological status of workers revealed that, among textile workers, cervical ectopy and lacerations were more frequent than among workers in metal industry. .

scholarly journals A comparative analysis of platinum and oxide-based catalytic converters in terms of NOx reduction with ammonia

2012 ◽  
Vol 150 (3) ◽  
pp. 55-62
Author(s):  
Wojciech KAMELA ◽  
Stanisław KRUCZYŃSKI
Keyword(s):  
Comparative Analysis ◽  
Diesel Engine ◽  
Catalytic Properties ◽  
Nox Reduction ◽  
Active Surface ◽  
Catalytic Converters ◽  
Nitric Oxides ◽  
Exhaust Gases ◽  
Conversion Rates ◽  
Physical And Chemical

The paper presents a comparison of the catalytic properties of two types of catalytic converters (containing platinum and oxide active coatings) in the aspect of a reduction of nitric oxides with ammonia. The tests were performed for three concentrations of ammonia in the exhaust gases of a diesel engine. The work contains images of the topography of the active surface of the catalytic converters and the results of its physical and chemical analysis. The changes of the conversion rates of the nitric oxides have also been presented in the converter temperature range from 150 to 550 °C along with the results of calculations of the shares of NO2 in NOx for all analyzed concentrations of ammonia in the exhaust gases.

COMPARATIVE ASSESSMENT OF PHYSICAL AND CHEMICAL PARAMETERS, QUANTITATIVE COMPOSITION OF THE MAIN GROUPS OF MICROORGANISMS AND PHYTOTOXICITY OF CERTAIN TYPES OF SOILS IN SURGUT

2020 ◽  
Author(s):  
M. V. Mantrova ◽  
Keyword(s):  
Comparative Analysis ◽  
Urban Soils ◽  
Podzolic Soil ◽  
Comparative Assessment ◽  
Lead Content ◽  
Quantitative Composition ◽  
Chemical Parameters ◽  
Physical And Chemical Parameters ◽  
Number Of Microorganisms ◽  
Physical And Chemical

The article presents a comparative analysis of 4 urban soils-culturosem, 2 urbanozem and undisturbed podzolic soil (control) - by physical and chemical parameters, the quantitative composition of the main groups of microorganisms and phytotoxicity. Urban soils differ from the background and from each other in terms of acidity, saturation of bases, and lead content; they lead in the number of microorganisms and have a stimulating effect on radish seeds and seedlings.

scholarly journals Bacillus Spp. Amylase: Production, Isolation, Characterisation and Its Application

2016 ◽  
Vol 4 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Shivani Sachdev ◽  
Sanjay Kumar Ojha ◽  
Snehasish Mishra
Keyword(s):  
Comparative Analysis ◽  
Bacillus Species ◽  
Amylase Production ◽  
Bacillus Spp ◽  
Bacterial Sources ◽  
Physical And Chemical ◽  
Hydrolysis Of ◽  
Different Sources ◽  
Starch Molecule ◽  
Good Substitute

Amylase is one of the leading enzymes used in industry from decades. The preliminary function of this enzyme is the hydrolysis of the starch molecule into glucose units and oligosaccharides. Amylases have spectacular application in broad spectrum of industries such as food, detergent, pharmaceutical and fermentation industries. Among different type of amylases α- amylase is in utmost demand because of its striking features. This particular enzyme is a good substitute over the chemicals catalyst used in industries. α- amylases can be acquired from different sources such as microorganism, animals and plants. Microorganisms are the major source of production of amylase because of the ease of availability, manipulation and operation.  The starch converting enzymes is basically generated using submerged fermentation.  Some of the prominent characteristics of amylase are its mode of action, substrate specificity and operating condition (temperature and pH). Amylases from different bacterial sources contribute differently to the particular trait of the enzyme. Bacillus amylases have been studied and applied so far because of their robustness in nature and easy accessible pure form of it. Thus this makes it more specific and fit for distinct application in the industry. The purpose of this manuscript was the comparative analysis of the physical and chemical features of α amylases from Bacillus species. It also focuses on the unique characteristics of this enzyme and their industrial applications.Int J Appl Sci Biotechnol, Vol 4(1): 3-14

scholarly journals Determination of zinc by atomic absorption in automobile tire rubber as a source of ecotoxicants in atmospheric air

2021 ◽  
Vol 2131 (3) ◽  
pp. 032059
Author(s):  
A A Fedoseenko
Keyword(s):  
Comparative Analysis ◽  
Sample Preparation ◽  
Atomic Absorption ◽  
Motor Vehicle ◽  
Zinc Content ◽  
Optimal Sampling ◽  
Atmospheric Air ◽  
Automobile Tire ◽  
Pre Treatment ◽  
Physical And Chemical

Abstract Annotation. A methodology for determining zinc in tires (as a source of ecotoxicants in the atmospheric air) by atomic absorption with microwave pre-treatment as a product of motor vehicle wear in St. Petersburg was developed. In the article, the author gives different ways of sampling for testing. One of the rubber samples was taken from one area no larger than 5x5 cm on one tyre (first sampling option), the second sample was taken cumulatively from all tyre sides around its circumference (second sampling option). Tests of selected samples were carried out allowing conclusions to be drawn about the optimal sampling method. A comparative analysis has been made of the test results of samples taken by different methods from the car tyre surface. Based on the comparative analysis conclusions were made about the homogeneity of the tire composition. Various physical and chemical methods of sample preparation for the heavy metals determination are presented. In the course of the work the author selected the optimal conditions for sample preparation for testing allowing to obtain the maximum possible extraction of the analyte at the stage of sample preparation. The atomic absorption method was used to determine the zinc content in automobile tire samples. On the basis of the results obtained conclusions about the optimal sampling methods and sample preparation were made and the test conditions of the samples were optimized.

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