Application of multiparametric cardiac measurement system in ejection fraction calculation

Ejection fraction (EF) is the most used parameter for characterisation of Heart Failure (HF) condition. EF is commonly calculated using echocardiography, which is an expensive non–invasive method and not used in primary healthcare. Systolic time intervals (STI) represent a non-invasive and inexpensive method for determination of EF[1, 2]. Heart failure (HF) is the single most expensive diagnosis in medicine. 2–3% of adult population in developed countries have HF diagnosis. It is not detectable by ECG test and it is commonly detected in a late stage, when the process is irreversible [2-5]. In this paper, a multiparametric cardiac measurement system for determination of STI is presented. Measurement system consists of sensors for simultaneous acquisition of electrocardiographic (ECG), phonocardiographic (PCG), photopletysmographic (PPG) and cardiovascular (CV) pulsation signals. CV pulsation signals are measured by long period grating (LPG) fiber-optic sensors[6]. Two non-invasive methods for measuring systolic time intervals (STI) were applied on a set of 6 healthy volunteers, based on ECG, PCG and CV pulsation signals. CV pulsation signals were measured on carotide arthery with PPG and LPG sensors. In the first method, EF was calculated from the obtained STI signals, using CV carotide pulsations measured with the PPG sensor, giving EF values in the range from 0.60 to 0.68, with maximal standard deviation of 0.05. In the second method, EF was obtained using CV carotide pulsations measured with LPG sensor, giving EF values in the range from 0.60 to 0.66, with maximal standard deviation 0.06. Calculated values of EF with both methods were in the 0.55 to 0.75 range which corresponds to normal EF range in healthy individuals

Relationships Between Bone Treatment Conditions and Co2+ Sorption Capacities

Co-60 is an important radionuclide in spent nuclear fuel and liquid radioactive wastes. For the purification of water containing Co2+, ions sorption on hydroxyapatite (Ca-10(PO4)(6)(OH)(2)) can be applied. The process is particularly cost-effective if biological apatite from animal bones is utilized. In this study, dependence between bovine bone treatment conditions and Co2+, sorption was investigated as a function of initial metal concentration. Eight sorbents were previously prepared using fractional factorial design, by simultaneous variations of five process variables between two levels: factor A-the type of the chemical reagent (H2O2 or NaOH), factor B-reagent concentration (0.1 mol/L or 2 mol/L), factor C-reaction temperature (20(o)C or 60(o)C), factor D-contact time (1h or 3h) and factor E-sample annealing (without or at 400(o)C). At this point, the effects of treatment factors on Co2+, sorption efficiency were evaluated using statistical analysis. Amounts of Co2+ sorbed, amounts of released Ca2+ ions and final pH values were considered as system responses. The results showed that the impact of various treatment factors was different for different starting concentrations of Co2+. Consequently, no statistically important relations could be established between treatment conditions and Co2+, sorption from 10(-4) and 5*10(-4) mol/L solutions, whereas thermal treatment at 400(o)C was the only statistically significant factor influencing sorption from the most concentrated solution (5*10(-3) mol/L). Depending on initial Co2+, concentration, various factors had statistically significant effect on equilibrium pH values, whereas no relation was found between bone treatment conditions and the amounts of Ca2+, released during the sorption.3rd International Conference on Radiation and Applications in Various Fields of Research (RAD), Jun 08-12, 2015, Budva, Montenegr

Leaching kinetics of Co(II) and Sr(II) contaminated soil via chemical extraction method

Artificially contaminated soil, with mixture of Co(II) and Sr(II) ions in different proportions, was tested. The main aim was to investigate the possibility of ethylenediamine-tetraacetic acid (EDTA) utilization in the chemical extraction process as a method for soil remediation in the case of mixed contamination. The efficiency of this process when EDTA of 10 -4 molL -1 was used was low, while the application of the EDTA solution of the initial concentration 5 · 10 -3 molL -1 or higher showed almost the same efficiency. This suggested that the application of the solution EDTA (5 · 10 -3 molL -1 ) is optimal from the aspect of cost and degradation of soil properties. Furthermore, process kinetic was fitted using one parameter shrinking core models. Kinetic data modeling showed that the process is complex, demanding multi resistance kinetic model. © 2018, Vinca Inst Nuclear Sci. All rights reserved

Mobility of Co2+ and Sr2+ ions in the contaminated soil: column study

The mobility of pollutants in the soil is closely related to their toxicity, and thus very important information for the selection of remediation strategies. In this study, leaching of Sr2+ and Co2+ ions from contaminated soil was investigated and compared under dynamic conditions. As a model soil, a sample from the “Vinča” Institute was tested. The soil artificially contaminated with inactive Sr2+ and Co2+ ions was packed in the columns, while acidic rain water was used as a leaching solution. Desorption of both cations was the most pronounced at the beginning, reaching the peak after the second day for Co2+ and after the seventh day for Sr2+. During the course of experiment (37 days), cumulative percentages of desorbed Co2+ and Sr2+ were 0.7% and 19.8 %, respectively. The results indicated significantly higher soil affinity towards Co2+ ions. In spite of its higher total concentration in the soil, Co2+ mobility was much lower compared to Sr2+

Mn bioavailability in soil after in situ remediation with apatite additive

Primena apatitnih materijala kao aditiva kontaminiranom zemljištu jedna je od intenzivno proučavanih metoda in situ stabilizacije radionuklida u zemljištu. Istraživanja uticaja tretmana na distribuciju Mn u zemljištu i njegovu biodostupnost su posebno interesantna, s obzirom da je ovaj element esencijalan za biljke. U ovom radu ispitan je efekat različitih doza biogenog apatita (0,3%, 2% i 5%) kao aditiva kiselom zemljištu, na frakciju biodostupnog Mn hemijski ekstrahovanog metodom DTPA, kao i na sadržaj Mn u nadzemnom delu biljke Lolium perenne gajene u pot-eksperimentima na netretiranom i tretiranom zemljištu. Ustanovljeno je da se sa povećanjem količine dodatog bioapatita smanjuje koncentracija Mn u DTPA ekstraktu, kao i u nadzemnom tkivu biljke. Hemijski ekstrahovane i biološki usvojene koncentracije Mn su međusobno bile u pozitivnoj korelaciji (R2=0,971, p<0,05). U svim varijantama tretmana DTPA ekstrakt je sadržao koncentracije Mn u granicama koja se smatraju adekvatnim za većinu biljnih kultura.The use of apatite materials as additives to contaminated soil is one of the intensively studied in situstabilization methodforradionuclides in thesoil.Investigation of the treatment effects on the Mn distribution in the soil and its bioavailability are particularly interesting, since this element is essential for plants.In this paper, the effect of various doses of biogenic apatite (0.3%, 2% and 5%) as an additive to acid soil, was investigated in relation to the bioavailable Mn fractionchemically extracted by DTPA methodand to the Mn content in the above-ground part of the Lolium perenneplant, cultivated on untreated and treated soils in pot experiments. It was found that the increase in the amount of added bioapatite decreases the concentration of Mn in the DTPA extract, as well as in the above-ground tissue of the Lolium perenneplant.Chemical extracted and biologically accepted Mn concentrations were in positive correlation (R2= 0.971, p <0.05).In the all treatment variants, the DTPA extractscontained Mn concentrations within the limits considered to be adequate for most plant cultures.Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681]XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србиј

Mn bioavailability in soil after in situ remediation with apatite additive

Primena apatitnih materijala kao aditiva kontaminiranom zemljištu jedna je od intenzivno proučavanih metoda in situ stabilizacije radionuklida u zemljištu. Istraživanja uticaja tretmana na distribuciju Mn u zemljištu i njegovu biodostupnost su posebno interesantna, s obzirom da je ovaj element esencijalan za biljke. U ovom radu ispitan je efekat različitih doza biogenog apatita (0,3%, 2% i 5%) kao aditiva kiselom zemljištu, na frakciju biodostupnog Mn hemijski ekstrahovanog metodom DTPA, kao i na sadržaj Mn u nadzemnom delu biljke Lolium perenne gajene u pot-eksperimentima na netretiranom i tretiranom zemljištu. Ustanovljeno je da se sa povećanjem količine dodatog bioapatita smanjuje koncentracija Mn u DTPA ekstraktu, kao i u nadzemnom tkivu biljke. Hemijski ekstrahovane i biološki usvojene koncentracije Mn su međusobno bile u pozitivnoj korelaciji (R2=0,971, p<0,05). U svim varijantama tretmana DTPA ekstrakt je sadržao koncentracije Mn u granicama koja se smatraju adekvatnim za većinu biljnih kultura.The use of apatite materials as additives to contaminated soil is one of the intensively studied in situstabilization methodforradionuclides in thesoil.Investigation of the treatment effects on the Mn distribution in the soil and its bioavailability are particularly interesting, since this element is essential for plants.In this paper, the effect of various doses of biogenic apatite (0.3%, 2% and 5%) as an additive to acid soil, was investigated in relation to the bioavailable Mn fractionchemically extracted by DTPA methodand to the Mn content in the above-ground part of the Lolium perenneplant, cultivated on untreated and treated soils in pot experiments. It was found that the increase in the amount of added bioapatite decreases the concentration of Mn in the DTPA extract, as well as in the above-ground tissue of the Lolium perenneplant.Chemical extracted and biologically accepted Mn concentrations were in positive correlation (R2= 0.971, p <0.05).In the all treatment variants, the DTPA extractscontained Mn concentrations within the limits considered to be adequate for most plant cultures.Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681]XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србиј

Analysis of factors influencing Cu(II) sorption by clinoptiolite

The effects of initial metal concentration and pH, as well as the sorbent mass and particle size, on Cu(II) sorption by natural clinoptilolite were evaluated and compared. Full factorial experimental design at two levels was applied. Statistically significant factors were determined considering residual Cu(II) concentrations as a system response.Physical chemistry 2012 : 11th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 24-28 September 201

Monitoring of respiratory volumes by an long period grating sensor of bending

Here, we present a method of respiratory volumes monitoring using a single fiber-grating sensor of bending. Measurements are conducted using simple monochromatic interrogation scheme that relies on a photodiode measurement of the power transmitted through a long period grating (LPG) sensor at fixed wavelength. Good sensor accuracy in measurements of tidal and minute respiratory volumes for different types of breathing is achieved.Conference on Light in Nanoscience and Nanotechnology (LNN), Oct 20-22, 2015, Hissar, Bulgari

Optimization of Sr-ion extraction from the contaminated soil using Box-Benken design

Among the factors that affect the degradation of soil quality, contamination with radioactive substances has gained significance due to the fast development and exploitation of nuclear energy. The remediation measures based on physical, chemical and biological principles aim to reduce the adverse effects of ionizing radiation on the ecosystem as a whole, either by radionuclide separation from the soil matrix or by their solidification/stabilization. The selection of suitable method is carried out for each individual case of contamination, as it depends on the soil type, the pollutant type, distribution, and the level of contamination, area that needs to be treated, overall cost, etc. In order to develop a site-specific treatment, optimization of the method performance is required through the extensive research on the effects of a large number of variables. In such cases, experimental design methodology (DOE) represents a useful approach for the comparison of different treatments and their optimization. In contrast to the conventional strategy of varying one factor at the time, DOE implies a simultaneous variation of all factors in order to disclose the most influential factors, the significant interactions between the factors, and the optimal levels of the factors. In the present study, the problem of soil contamination with 90Sr was addressed. Previous investigations on Sr-ions distribution in the soil have revealed their preferential association with the ion-exchangeable sites, regardless of the soil type, contamination level and aging time. High mobility of Sr in the soil is, therefore, the property that makes the separation by chemical extraction a simple and economical option since the effects can be achieved using solutions of competing cations. The soil, sampled at the site of the Vinča Institute of Nuclear Science and the Public Company Nuclear Facilities of Serbia, was artificially contaminated with Sr-ions. The Box-Benken design was used for the analysis of soil remediation efficiency using Ca(NO3)2 as an extracting agent. Reagent concentration, soil/liquid ratio and contact time were considered as process variables, whereas the amounts of extracted cations and the final pH values were monitored as the response functions. The applicability of different mathematical models, with the inclusion of linear or quadratic terms, was tested for the description of experimental results. Analysis of variance of the chosen responses showed that Sr extraction efficiency was primarily affected by the variation of the reagent concentration. By proper selection of the levels of investigated factors, complete removal of Sr was achieved. Furthermore, DOE enabled the prediction of system responses, which makes it a significant tool in practical applications.VII International Conference on Radiation in Various Fields of Research : RAD 2019 : book of abstracts; June 10-14, 2019; Herceg Novi, Montenegr

Radioactive waste and decontamination: Retrospective of papers presented on Symposiums of the Radiation protection society in the period 1963-2017

Kao neizbežni pratioci svih vidova proizvodnje i primene nuklearne energije nastaju nusprodukti -otpadni materijali, koji nemaju potencijala za dalje korišćenje, a čija aktivnost premašuje granične vrednosti propisane zakonskom regulativom. Akcidenti pri proizvodnji i primeni nuklearne energije, manipulaciji i transportovanju izvora jonizujućeg zračenja i druge vanredne situacije u miru i ratu, značajno doprinose generisanju radioaktivnog otpada kao i radijacionoj kontaminaciji materijalnih sredstava i objekata, životne sredine i živih bića. Povodom jubilarnog XXX Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, kroz restrospektivu radova saopštenih na prethodnim skupovima prikazano je kako su se na vremenskoj skali od 54 godine menjale aktualne teme, problemi, metodologija rada i koji su zaključci proistekli iz naučnih istraživanja i praktičnog rada u oblasti radiokativnog otpada i dekontaminacije.As inevitable followers of all forms of production and application of nuclear energy, waste materials are produced which do not have the potential for further use and which activity exceeds the limit values prescribed by the legislation. Accidents in the production and application of nuclear energy, manipulation, and transportation of sources of ionizing radiation, and other emergencies in peace and war, contribute significantly to the generation of radioactive waste as well as to the radiation contamination of material assets and objects, the environment and living beings. On the occasion of the jubilee XXX Symposium of the Society for Radiation Protection of Serbia and Montenegro, through the retrospection of the papers presented at the previous meetings, the current topics have been tracked on the timeline of 54 years, as well as the problems, the methodology of work and significant conclusions derived from scientific research and in practice.Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681]XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србиј