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The Interdependence of Organic and Biogenic Pollutants Concentrations in the Aspect of their Susceptibility to Biodegradation – A Case Study

Bugajski Piotr Michał, Pawełek Jan, Jóźwiakowska Karolina

Journal of Ecological Engineering

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2021

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Vol. 22, nr 4

138--147

EN

The aim of the research was to determine, the interdependence between COD and such parameters as: BOD5, TN and TP in raw wastewater and in mechanically treated wastewater using statistical methods, which would allow estimating the values of these parameters based on COD. Moreover, the aim of the study was to determine the susceptibility of wastewater before and after mechanical treatment to decomposition of organic and biogenic pollutants. The research was conducted from 2006 to 2015 in a collective wastewater treatment plant in Nowy Sącz. During the research period, 120 samples of raw and mechanically treated wastewater were collected and analyzed once a month. In the analytical part of the research, the quality of sewage was characterized, the strength of correlation of the examined indicators was determined and the susceptibility of sewage to biological decomposition was assessed. On the basis of the analysis it was found that knowing the value of the COD parameter it is possible to determine the values of the other indicators, i.e. BOD5, TN and TP. Moreover, it was shown that wastewater is largely susceptible to the biological decomposition of pollutants, and during the period when the inflow of sewage with reduced susceptibility occurs, the wastewater with high content of organic carbon should be dosed.

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Plantar temperature and vibration perception in patients with diabetes: A cross-sectional study

Ashok Bhargavi Haripriya, Karnam Anantha Sunitha, Janarthan Kumar

Biocybernetics and Biomedical Engineering

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2020

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Vol. 40, no. 4

1600--1610

EN

Diabetes mellitus has many microvascular and macrovascular complications. Diabetic foot is a major consequence of these complications. Foot ulcers are the leading cause of non-traumatic amputations and early diagnosis can prevent amputation. In this study, thermal foot images and biothesiometer values of 50 control subjects and 50 known diabetic subjects were analyzed. The thermal images were analyzed using a graphical interface-enabled program developed indigenously to identify possible hotspots (abnormal temperature variation). Data comparison was conducted based on the concept of asymmetry. Temperature and vibration perception values obtained at the same points on the left and the right feet were compared. The use of a combination of thermal images and vibration perception resulted in lower incidence of false positive results in the pre-evaluation of possible plantar lesions. Pearson's correlation test was performed to analyze the statistical significance of these factors. This study concluded that the classification of factors leading to pre-ulcerative lesions in the diabetic foot could be accomplished with a higher level of confidence by using multiparameter data rather than a single-variable predictive model.

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Badanie wpływu oddziaływań napełniacz - napełniacz, napełniacz - polimer i gęstości usieciowania na właściwości fizyczne wulkanizatów SBR

Potocki K.

Elastomery

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2009

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T. 13, nr 4

19-25

PL

Często na badane właściwości fizyczne wpływ wywiera więcej niż jeden czynnik. W przypadku gumy zawierającej sadzę aktywną czynnikami wywierającymi zasadniczy wpływ na właściwości fizyczne są oddziaływania napełniacz - polimer, oddziaływania napełniacz - napełniacz oraz gęstość usieciowania. Wpływ zespołu czynników na daną właściwość można określić obliczając współczynnik korelacji wielokrotnej. Z kolei obliczenie współczynników korelacji cząstkowej pozwala stwierdzić, które czynniki wywierają większy wpływ na zmiany badanej właściwości fizycznej. Korelacje cząstkowe i wielokrotne obliczono korzystając z korelacji Pearsona między dwiema cechami. Wiarygodność wyliczonych korelacji Pearsona oszacowano korzystając z testu t.

EN

Often, there is more than one factor that influence on physical properties of an investigated object. In case of rubber filled with active carbon black, the main factors that have an effect on properties are: filler -filler interactions, filler - polymer interactions and crosslinking density. The influence of all these factors on a particular property was determined by calculation of multiple correlations. Whereas the influence of a separately factor on a distinguished property in comparision with other factors was determined by calculation of partial correlations. The reliability of Pearson's correlations that were needed to calculate partial correlations and multiple correlations was determined by test t.