scholarly journals Evaluating the possibility of color treatment of Tarcon Blue 2BLN dye by coagulating materials PGa21Ca, polyaluminium chloride, iron (II) sulfate heptahydrate and aluminium sulfate octadecahydrate

2020 ◽  
Vol 4 (3) ◽  
pp. First
Author(s):  
Le Thi Xuan Thuy ◽  
Le Thi Suong
Keyword(s):  
Ph Value ◽  
Joint Stock Company ◽  
Stock Company ◽  
Solution Ph ◽  
Sulfate Heptahydrate ◽  
Aluminium Sulfate ◽  
Color Treatment ◽  
Actual Wastewater ◽  
Wastewater Samples ◽  
Polyaluminium Chloride

This article presented the results of color treament ability of Tarcon Blue 2BLN dye with some flocculation chemicals such as PGa21Ca, polyaluminium chloride (PAC), iron (II) sulfate heptahydrate (FeSO4.7H2O) and aluminium sulfate octadecahydrate (Al2(SO4)3.18H2O). Our results showed that conditions for treatment the color to reach column B, QCVN 13: 2015 / BTNMT (national technical regulation on textile and dying industry) by different flocculation chemicals were the same exposure time (10 minutes), sedimentation time (30 minutes), but different in parameters of concentration (% mass), stirring speed and pH. Specifically: PGa21Ca (0.02%), PAC (0.01%), aluminium sulfate octadecahydrate (0.003%) can handle color at the initial pH of the solution (pH = 6), with the stirring speed corresponding to each flocculation chemical at 120 rpm, 45 rpm and 45 rpm respectively. In contrast, with iron (II) sulfate heptahydrate (0.02%), only the color treatment reaches column B, QCVN 13: 2015 / BTNMT when the pH of the wastewater raises to 10 and stirring speed is 120 rpm. Compared with PAC, aluminium sulfate octadecahydrate and iron (II) sulfate heptahydrate, PGa21Ca has the advantage of contributing to raise the pH value in the acid solution, which reduces the pH in the base environment, and not changing the pH when the concentration of PGa21Ca increases. Test results on actual wastewater samples taken from Hoa Khanh Danang Textile Joint Stock Company (DANATEX) showed that the ability of treating color of these chemicals on actual wastewater samples is lower than the ability on water samples blended with Tarcon Blue 2BLN dye.

Studying Demand for Institutes of Corporate Governance: Legal Aspects

2003 ◽  
pp. 50-61 ◽  
Author(s):  
T. Medvedeva ◽  
A. Timofeev
Keyword(s):  
Corporate Governance ◽  
Legal Aspects ◽  
Joint Stock Company ◽  
Federal Law ◽  
Stock Company ◽  
Open Joint Stock Company ◽  
Open Joint ◽  
Market Relations ◽  
Corporate Legislation

The article analyzes legal aspects of institutes of corporate governance. Different draft laws "On Joint-Stock Companies" are considered which reflected interests of separate groups of participants of market relations. Stages of property redistribution are outlined. The advantages of the model of the open joint-stock company are formulated. Special attention is paid to the demand for legal institutes of corporate governance as well as to the process of accepting the Federal Law "On Entering Amendments to the Federal Law "On Joint-Stock Companies"" which was enacted in 2002. The article contains proposals directed at improvement of corporate legislation.

Assessment of professional risk of health of workers of the enterprise for repair of railway carriage

2020 ◽  
pp. 9-19
Author(s):  
O. Klepikov ◽  
A. Boreyko ◽  
G. Kurenkova
Keyword(s):  
Relative Risk ◽  
Working Conditions ◽  
Light Level ◽  
Occupational Risk ◽  
Rolling Stock ◽  
Joint Stock Company ◽  
Stock Company ◽  
Production Factors ◽  
Object Of Study ◽  
High Level

The aim of the study was to assess the professional risk of developing diseases in workers of the railway car repair enterprise. The Voronezh Car Repair Plant, a branch of Vagonremmash Joint-Stock Company, was chosen as the object of study. Methods: «The methodology for calculating individual occupational risk depending on the working conditions and the health status of the employee», developed by the Klin Institute for Protection and Working Conditions in conjunction with the Research Institute of Occupational Medicine (2013), the main professions; cohort study with the calculation of the relative risk of morbidity with temporary disability, the odds ratio, the etiological share of factors in the formation of morbidity (group size: 250 people, experimental group — workers of the main specialties, 95 people — comparison group). Results. According to the research results, the priority factors of occupational health risk include: chemical, noise, heating microclimate, low light level. For certain professions, the share of the contribution of priority factors to the risk profile (PV) reaches 40 %. The indicator of individual occupational risk is 0.12 to 0.26 units. The high level of professional risk (0.22 ÷ 0.26) is characterized by the working conditions of the mechanics for the repair of rolling stock, machine tools (woodworking), casters (metal), thermists, plastic casters. In professional groups with medium and high risk, the indicator of the relative risk of morbidity with temporary disability is higher than 1 (RR = 1.75 and 1.39, respectively), and the etiological share of production factors in the formation of diseases is from 27.95 (subgroup with secondary professional risk) up to 42.88 % (a subgroup with high professional risk), which indicates the professional condition of the disease. Discussion. In general, our data are consistent with the results of similar studies conducted earlier at the car building and car repair enterprises. In order to ensure hygienically safe working conditions and preserve the health of workers, it is necessary to reduce the level of exposure to production factors, including through the introduction of modern equipment and improvement of technological processes.

EVALUATION OF THE FINANCIAL STABILITY OF THE INSURANCE ORGANIZATION

2020 ◽  
pp. 68-78
Author(s):  
Oleg Georgievich Blazhevich
Keyword(s):  
Capital Structure ◽  
Financial Stability ◽  
Load Level ◽  
Joint Stock Company ◽  
Insurance Company ◽  
Working Capital ◽  
Stock Company ◽  
Ability To Pay ◽  
Essential Component ◽  
Equity Ratio

The article studies the financial stability of a particular insurance organization. The financial stability of the insurance company is an essential component of its activities and characterizes the ability to pay off its obligations on time and in full. The analysis of financial stability is defined as an independent object of evaluation, which explores the structure of the formation and use of capital. To assess the financial stability of the insurance company, a set of indicators was formed, including the following ratios: level of equity, ratio of equity to liabilities, ratio of insurance premiums and insurance reserves, ratio of working capital and non-current capital, level of permanent capital, ratio of equity and insurance reserves, level of debt load, level of insurance reserves. The insurance public joint-stock company RESO-Garantia was chosen as the object of analysis. The analysis showed that the capital structure in the insurance company under consideration is not optimal. The company has a shortage of insurance reserves, which is offset by equity.

scholarly journals Evaluation of the Quality of Irrigation Machinery by Monitoring Changes in the Coefficients of Uniformity and Non-Uniformity of Irrigation

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1499
Author(s):  
Ján Jobbágy ◽  
Peter Dančanin ◽  
Koloman Krištof ◽  
Juraj Maga ◽  
Vlastimil Slaný
Keyword(s):  
Repeated Measurements ◽  
Joint Stock Company ◽  
Stock Company ◽  
Uniformity Coefficient ◽  
Quality Of Work ◽  
Total Length ◽  
Irrigation Uniformity ◽  
Wide Range ◽  
The Impact

Recently, the development of agricultural technology has been focused on achieving higher reliability and quality of work. The aim of the presented paper was to examine the possibilities of evaluating the quality of work of wide-area irrigation machinery by monitoring the coefficients of uniformity and non-uniformity of irrigation. The object of the research was pivot irrigation machinery equipped with sprinklers with a total length from 230 to 540 m. The commonly applied quality of work parameter for wide-range irrigators is the irrigation uniformity coefficient according to Heermann and Hein CUH. Work quality evaluations were also carried out through other parameters applicable in practice, such as irrigation uniformity coefficients calculated according to Christiansen CU, Wilcox and Swailes Cws, and our introduced parameters, the coefficient ar (derived from the degree of unevenness according to Oehler) and the degree of uniformity γr (derived from the degree of non-uniformity according to Voight). Other applied parameters for determining the quality of work of wide-range irrigation machinery were the coefficients of irrigation uniformity according to Hart and Reynolds CUhr, further according to Criddle CUcr and subsequently according to Beale and Howell CUbr. Next, the parameters of the non-uniformity coefficient according to Oehler a, the coefficient of variation according to Stefanelli Cv, the degree of non-uniformity according to Voigt γ and the degree of non-uniformity according to Hofmeister Ef were evaluated. Field tests were performed during the growing season of cultivated crops (potatoes, corn and sugar beet) in the village of Trakovice (agricultural enterprise SLOV-MART, southwest of the Slovakia) and in the district of Piešťany (Agrobiop, joint stock company). During the research, the inlet operating parameters (speed stage, inlet pressure, irrigation dose), technical parameters (number of sprayers, total length, number of chassis) and weather conditions (wind speed and temperature) were recorded. The obtained results were examined by one-way ANOVA analysis depending on the observed coefficient or input conditions and subsequently verified by Tukey and Duncan tests as needed. Irrigation uniformity values ranged from 67.58% (Cws) to 95.88% (CUbh) depending on the input conditions. Irrigation non-uniformity values ranged from 8.58 (a, Ef) to 32.42% (Cv). The results indicate a statistically significant effect of the site of interest and thus the impact of particular field conditions (p < 0.05). When evaluating the application of different coefficients of irrigation uniformity, the results showed a statistically significant effect only in the first test (p = 0.03, p < 0.05). During further repeated measurements, the quality of work increased due to the performed inspection of all sprayers and the reduction in the influence of the wind.

scholarly journals Separation of Radionuclides from a Rare Earth-Containing Solution by Zeolite Adsorption

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 20
Author(s):  
Deniz Talan ◽  
Qingqing Huang
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Contact Time ◽  
Separation Efficiency ◽  
Ph Value ◽  
Solid Phase ◽  
Separation Performance ◽  
Solution Ph ◽  
Zeolite Sample ◽  
Alternative Sources

The increasing industrial demand for rare earths requires new or alternative sources to be found. Within this context, there have been studies validating the technical feasibility of coal and coal byproducts as alternative sources for rare earth elements. Nonetheless, radioactive materials, such as thorium and uranium, are frequently seen in the rare earths’ mineralization, and causes environmental and health concerns. Consequently, there exists an urgent need to remove these radionuclides in order to produce high purity rare earths to diversify the supply chain, as well as maintain an environmentally-favorable extraction process for the surroundings. In this study, an experimental design was generated to examine the effect of zeolite particle size, feed solution pH, zeolite amount, and contact time of solid and aqueous phases on the removal of thorium and uranium from the solution. The best separation performance was achieved using 2.50 g of 12-µm zeolite sample at a pH value of 3 with a contact time of 2 h. Under these conditions, the adsorption recovery of rare earths, thorium, and uranium into the solid phase was found to be 20.43 wt%, 99.20 wt%, and 89.60 wt%, respectively. The Freundlich adsorption isotherm was determined to be the best-fit model, and the adsorption mechanism of rare earths and thorium was identified as multilayer physisorption. Further, the separation efficiency was assessed using the response surface methodology based on the development of a statistically significant model.

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