The classification of titanium dioxide does not change the dust limit values

2020 ◽  
Vol 2020 (11) ◽  
pp. 5
Keyword(s):  
Titanium Dioxide ◽  
Limit Values

Shrinkage properties of natural and diesel oil-contaminated fine soils from central Poland

2021 ◽  
pp. qjegh2021-006
Author(s):  
Dorota Izdebska-Mucha ◽  
Emilia Wójcik
Keyword(s):  
Expansive Soils ◽  
Diesel Oil ◽  
Hydrocarbon Contamination ◽  
Volumetric Shrinkage ◽  
Limit Values ◽  
Central Poland ◽  
Shrinkage Behaviour ◽  
Margin Of Safety ◽  
Glacial Tills

The objectives of this paper are to provide a regional description of the shrinkage parameters of Neogene clays and glacial tills from central Poland; and to present the effects of hydrocarbon contamination on the shrinkage behaviour of soils. Forty samples containing from 19 to 90% clay-size particles were tested. The comparison of the three methods applied has indicated that the shrinkage limit values obtained by the BS 1377-2 method provide a greater margin of safety when used in the classification of expansive soils and yield the best matching in the analysis of the variability of the shrinkage limit in relation to other soil index parameters. A good correlation was found between the shrinkability index and the consistency index, which leads to a new classification of soils. The shrinkage tests of clean and diesel oil-contaminated samples revealed that contamination has a significant and irregular effect on the values of shrinkage parameters. For low degree of contamination the shrinkage limit of both soils had the lowest values and the volumetric shrinkage was maximum, and then with increasing ON content the shrinkage limit values tend to increase, while the volumetric shrinkage decreased.

scholarly journals Classification of quality conditions of a traction motor frame insulation of locomotives

2019 ◽  
Vol 294 ◽  
pp. 03002
Author(s):  
Michail Kapitsa ◽  
Vasiliy Laguta ◽  
Yuriy Kozik
Keyword(s):  
Residual Life ◽  
Operating Time ◽  
Statistical Characteristics ◽  
Traction Motor ◽  
Limit Values ◽  
Voltage Curve ◽  
Frame Insulation ◽  
Recovery Voltage ◽  
Insulation Condition

The objective of the article is to determine the quality conditions of a locomotive traction motor frame insulation based on observations over the recovery voltage and classification of a tested insulation wear degree as well as to determine estimates of operating time until the insulation restoration or replacement with a new one. To classify the insulation quality conditions and to forecast its residual life until the restoration, a cluster analysis and discriminant analysis are used based on indicators reflecting the properties of an insulation recovery voltage curve. The study defines an information content received from frame insulation recovery voltage readings as compared with its resistance from the perspective of testing the insulation condition and predicting its residual life. Statistical characteristics of clusters corresponding to the insulation condition stages allow determining the limit values of predicting parameters and estimating the residual insulation life prior the restoration. To classify the insulation condition, an integrated evaluation of the insulation condition quality is proposed. Integrated evaluation is performed according to the recovery voltage curve and is used as an indicator during clustering. An experimental study of the proposed method practically confirmed its effectiveness.

Substance classification of titanium dioxide illustrates limitations of EU legislation

Nature Food ◽  
2020 ◽  
Vol 1 (9) ◽  
pp. 523-525
Author(s):  
Christian Riebeling ◽  
Andrea Haase ◽  
Tewes Tralau ◽  
Andreas Luch
Keyword(s):  
Titanium Dioxide ◽  
Eu Legislation

scholarly journals ABRASIVOS: UMA ANÁLISE DE DENTIFRÍCIOS COMERCIALIZADOS EM SALVADOR

2015 ◽  
Vol 5 (3) ◽  
Author(s):  
Lydia De Brito Santos ◽  
Ana Carla Ferreira Rios ◽  
Viviane Maia Barreto Oliveira ◽  
Sônia Cristina Freitas Lemos Lopes ◽  
Taiana Silva Dantas
Keyword(s):  
Titanium Dioxide ◽  
Calcium Carbonate ◽  
Aluminum Oxide ◽  
Sodium Bicarbonate ◽  
Silicon Dioxide ◽  
Color Change ◽  
Tooth Surface ◽  
The Public ◽  
The City

Most toothpastes sold in Brazil contains abrasive composition with the function of preventing the formation of spots or pigmented film and burnish the tooth surface, however, the indiscriminate use of abrasives has generated discussion regarding the effects of this component. Objective: To evaluate dentifrices sold in the city of Salvador as to its commercial presentation, regarding the inormation contained in the packages related to abrasives, in order to verify if guidelines are offered to the public to assist them in choosing those products and to the professionals when it comes to the guiding elements of the prescription. Methodology: We have analyzed 45 packages of toothpaste, randomly purchased from supermarkets in Salvador, for two years. We have observed the following: component that guides the classification of toothpaste, type and concentration of abrasive and instructions with respect to the degree of abrasiveness. Results: All trademarks contained abrasive analyzed singly or in combination; eight types of abrasives have been found: Calcium Carbonate (27%), Silica (26%), Sodium Bicarbonate, Silicon Dioxide, Titanium Dioxide, trisodium phosphate, aluminum oxide and sodium silicate. Manufacturers have associated to the dentifrices naturals extracts with the purpose to prevent the dental color change without tooth and gengival aggression caused by abrasives associations. Conclusion: Lack of guidance on packaging about the level of abrasiveness of toothpaste that can guide patients and professionals to its rational use.

The Influence of Geopolymerization Process on Liquid and Plastic Limits of Soils

2015 ◽  
Vol 754-755 ◽  
pp. 886-891
Author(s):  
Sharifah Zaliha Syed Zuber ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Fauziah Ahmad ◽  
Mohammed Binhussain
Keyword(s):  
Chemical Reactions ◽  
The Other ◽  
Plastic Limit ◽  
Limit Values ◽  
Solid Soil ◽  
Alkaline Activator ◽  
Ratio Range ◽  
Different Soils ◽  
Properties Of Soil

Liquid and plastic limits are very important especially for classification of soil and other engineering purposes where they can provide basis information and also better understanding about the soil. In this study, the geopolymerization process was applied to three different soils; kaolin and the other two soils (Soil 2 and Soil 3) were taken at two different places to investigate any changes of liquid and plastic limit values with solid (soil) to alkaline activator (S/L) ratio range from 1 to 4. The results obtained indicated that the geopolymerization process influenced those values and with further investigation, there might be possibility the properties of soil could be improved due to the chemical reactions.

scholarly journals Macrophytes in the assessment of river ecological condition on the example of Pszczynka River (Silesian Upland)

2013 ◽  
Vol 1 (3) ◽  
pp. 14-20 ◽  
Author(s):  
Edyta Sierka ◽  
Agnieszka Tomczak
Keyword(s):  
Water Quality ◽  
Ecological Status ◽  
Ecological Condition ◽  
Left Bank ◽  
Class Iii ◽  
Limit Values ◽  
Vistula River ◽  
River Bed ◽  
Macrophyte Index

Abstract The Water Framework Directive introduced an ecological approach to the assessment and classification of waters. The part of the assessmentare macrophyte - based methods used in the evaluation of the ecologicalcondition of rivers in respect of biodiversity. The Macrophyte Method for River Assessment has been used in Poland since 2007 and provides us with an information about ecological state of the rivers. Presented analyses were aimed to describe macrophyte development in the sandylowland type of river in the Silesian Upland. The assessment was made for lowland Pszczynka River (45.8 km total length, total catchment area 368.3 km2), which is a left-bank tributary of Vistula River. At the selected 10 research sections of the river (100 m each) the composition of macrophytes and abiotic conditions of the river were described. The paper presents the results of preliminary assessment of ecological condition of Pszczynka River on the background sources of substances discharged to the riveralongits course. Macrophyte Index for Rivers (MIR) was calculated based on the results of the research - river bed surface coverage by the particular plant species. The MIR limit values were used to determine the class of water quality in the examined river. Overall, the ecological status of Pszczynka River was rated as moderate and its water classified as Class III of water quality.

scholarly journals Criteria for Abnormality Evaluation of Selected Weather Parameters in the Slovak Republic

2017 ◽  
Vol 63 (2) ◽  
pp. 86-91
Author(s):  
Martin Danilovič ◽  
Helena Hlavatá ◽  
Božena Šoltysová
Keyword(s):  
Air Temperature ◽  
Slovak Republic ◽  
Weather Conditions ◽  
Growing Season ◽  
Cultivated Plants ◽  
Limit Values ◽  
Temperature And Precipitation ◽  
Weather Parameters

Abstract The paper describes the procedure of calculation and assessment of deviations of the average air temperature from the normal (in relation to the normal 1961‒1990) or long-term average and the percentage of normal precipitation or long-term sum of precipitation, valid for the Slovak Republic. Three evaluation tables clearly indicate both threshold limit values, which facilitate the classification of the calculated indices for air temperature and precipitation. Criteria presented in this work are fully applicable for weather conditions evaluation during the growing season of cultivated plants in the Slovak Republic.

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