Adnan Masic

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Verified

Adnan verified their affiliation via an institutional email.

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• PhD
• Professor (Full) at University of Sarajevo

Vertical temperature profiles represent a very important factor for various analytical and numerical studies, such as weather forecasts, air pollution models and computational fluid dynamics simulations. These temperature profiles are especially important during the winter periods, when temperature inversions occur. The cities in the natural valley...

In this paper we evaluate characteristics of three optical particulate matter sensors/sizers (OPS): high-end spectrometer 11-D (Grimm, Germany), low-cost sensor OPC-N2 (Alphasense, United Kingdom) and in-house developed MAQS (Mobile Air Quality System), which is based on another low-cost sensor – PMS5003 (Plantower, China), under realistic conditio...

In this paper, we present a city-scale (possibly global) air pollution network made of low-cost sensors for particulate matter concentration in the air. The components of the presented system are based on our research and experience from previous studies focused on air quality instruments and sensors for addressing urban air pollution. Sensor nodes...

In this paper we present a city-scale (possibly global) air pollution network made of low-cost sensors for particulate matter concentration in the air. The components of presented system are based on our research and experience from previous studies focused on air quality instruments and sensors for addressing urban air pollution. Sensor nodes are...

The concentrations of eight heavy metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) associated with PM2.5 and PM10 in Sarajevo air, Bosnia and Herzegovina (BiH) have been studied. A total of 136 PM2.5 and PM10 samples were simultaneously collected from 21 February to 11 November 2020. Metal contents were determined by atomic absorption spectrometry, flame...

In this paper, a certain system of ordinary differential equations is observed and the existence of Hopf bifurcation is analyzed. A detailed analysis of local stability depending on the parameters was performed. During the analysis of global stability, the existence of an stable limit cycle surrounding the unstable equilibrium point and Hopf bifurc...

In this paper we observed a certain rational difference equation of the second order with quadratic terms. The local stability of this equation was fully tested and the absence of periodic solutions of period-two was proven. The stability of the zero equilibrium has been proven for all values of positive parameters, while depending on the positive...

We investigatea polynomial difference equation of type$${x}_{n+1}=P\left({x}_{n}\right){x}_{n-1}+P\left({x}_{n-1}\right){x}_{n-1}+b{x}_{n-1}, n=\mathrm{0,1},2, \dots $$ in the positive quadrant with initial conditions \(({x}_{-1},{x}_{0})\) for which it has been fulfilled b \(\ge 0, 2P\left(0\right)+b<1\) and \(P(x)\) is polynomial with nonnegative...

In this paper we observed the global dynamics and the occurrence of a certain bifurcation for the corresponding values of a certain rational difference equation of the second order with analyzed quadratic terms. The analysis of the local stability of the unique equilibrium point, as well as the unique periodic solution of period two, was performed...

In this paper we present a local dynamics and investigate the global behavior of certain second order rational difference equation of type$$x_{n + 1} = \frac{{ax_{n} x_{n - 1} + ax_{n - 1}^{2} + bx_{n - 1} }}{{cx_{n} + cx_{n - 1} + d}},$$with positive parameters a, b, c, d \((a \ne c\)) and initial conditions. We establish the relations for local s...

Sažetak: U ovom radu predstavljamo mrežu senzora koncentracije lebdećeih čestica (PM) koja je zasnovana na principu internet oblaka i daje mjerenja visoke prostorne i vremenske rezolucije u realnom vremenu. Mreža je razvijena na Mašinskom fakultetu u Sarajevu i intenzivno je testirana u protekle tri godine. Dobijeni su dobri koeficijenti korelacije...

A novel method for terrain mapping is presented in this paper. It is based on low-cost open source components, which brings this innovative technique to a much wider group of researchers than ever before. The in-house developed drone was used together with a commercially available LiDAR sensor to produce a terrain mapping platform. This system was...

Continuous measurement of black carbon (BC) concentrations in ambient air was performed using the optical-based instrument called aethalometer. The attenuation of light by BC was measured at 7 different wavelengths. This gives not only the pure concentration of BC in the ambient air but also dependence of attenuation on the wavelength of light, fro...

A new approach for measurements of vertical profiles of temperature and particulate matter (PM) concentrations is developed and tested. Special purpose unmanned aerial vehicle with data acquisition system has been developed in-house. The temperature sensor is based on a fast response thermistor, while the PM sensor uses optical detection of particl...

To provide the reference dataset for particulate matter concentrations, a long-term campaign of continuous gravimetric measurements of PM10 and PM2.5 concentrations was performed. Strict implementation of standard EN12341:2014 was fulfilled. Daily and monthly concentrations of both PM10 and PM2.5 were measured with the highest possible accuracy. Ra...

Nanoparticles with diameters from 10 nm to 1000 nm were analyzed using the scanning mobility particle sizer (SMPS) continuously from October 2020 till May 2021. Mass spectrometry was performed in 129 channels. Measurements of some other air pollution parameters were used for comparison and analysis. A large number of nanoparticles was detected in t...

In this paper we considered the existence of chaos in the system of rational differential equations of the first order with linear terms in the numerator and denominator, positive coefficients and non - negative initial conditions. We used Marott’s definition and theorem for the existence of discrete chaos in the n dimensional case. It is shown tha...

In this paper we will look at the one system of ODE and analyze it. We aim to determine the points of equilibrium; examine their character and establish the existence of a bifurcation for the corresponding parameter value. A detailed analysis of local stability was performed for all values of the given parameter. For a certain value of the paramete...

The main objective of this research was to propose a light and practical design solution for electric bike front drive with bottom bracket electric motor. The initial design needs to be redesigned so it can enable simultaneous use of the electric drive and pedal drive, with integration of the front gear shifter. After gathering the basic informatio...

Within the work, on the basis of previously obtained real components, the design, dimensioning and analysis of hexacopters were performed. The 3D virtual model was developed using the SolidWorks software package, and then the necessary stress analysis by the finite element method was performed. After 3D modeling, an analytical load calculation was...

An advanced system for determination of face mask efficiency is developed and presented in this paper. It is based on a high-end scanning mobility particle sizer (SMPS), which was able to detect nanoparticles from the diameter of 10 nm up to 1000 nm in 129 equidistant channels. Two fitting installations for face masks were used: a mannequin doll he...

A new method for mobile measurements of black carbon (BC) concentration measurements is presented in this paper. An advanced pocket-sized aethalometer with 5 wavelengths and dual-spot technology was used. Different measurement locations were selected to evaluate the contribution of car emissions and biomass burning emissions during the winter campa...

A novel method for indoor air quality monitoring is presented in this paper. It is based on the network of smart sensors permanently connected to the cloud. The prototype system, consisting of 10 smart sensors is evaluated in laboratory and real use. Each smart sensor was able to measure air temperature, relative humidity, particulate matter concen...

Sarajevo Canton Winter Field Campaign 2018: particulate air pollution in a global hotspot

In this paper we evaluate characteristics of three optical particulate matter sensors/sizers (OPS): high-end spectrometer 11-D (Grimm, Germany), low-cost sensor OPC-N2 (Alphasense, United Kingdom) and in-house developed MAQS which is based on another low-cost sensor – PMS5003 (Plantower, China), under realistic conditions of strong and mild urban p...

Carbon dioxide (CO2) is important factor of indoor air quality. In this paper we evaluate several CO2 sensors of latest generation. All sensors work on the same principle: nondispersive infrared (NDIR) detection. The sensors were evaluated in the campaign that lasted for several months. Good agreement between all sensors was observed, despite diffe...

One of the most important parameters of air pollution, concentration of particulate matter suspended in the air (aerosols), is measured by means of low-cost sensors of latest generation. Such measurements have high resolution in both space and time, but there is a big question about applicability of low-cost sensors for measurements of aerosol conc...

Low-cost electrochemical sensors and in-house developed data acquisition system are used in two experiments, which reflect real-life scenarios of air pollution. Primary aim of this research is evaluation of the new approach for measuring the concentrations of toxic gases in realistic, everyday situations. These experiments include: continuous diurn...

Measurement of the concentrations of toxic gases (such as CO, SO2, NOX and O3) in the air represent important but challenging task. Traditionally, these concentrations are measured by means of heavy and expensive toxic gas monitors, usually operated by the governmental institutions. In this paper we present a novel method based on commodity (lowcos...

Air pollution with particulate matter (PM) represents major risk for humans’ health. Important step towards the solution of the aforementioned problem is the correct measurement of PM concentrations in the air. Commodity (low-cost) sensors are very popular nowadays, since they are affordable and they fit well in the trend called Internet of Things...

Graphical presentation of the measured data is more popular than ever before. However, rich and colourful images are often misrepresentation of the measured quantities. In this paper we discuss proper mathematical technique for correct presentation of data from the network of sensors. Three common methods for spatial interpolation are demonstrated...

Main point of interest of our research is the numerical simulation of nucleate boiling. In this paper we present a model which can be used to simulate such processes. The model resolves the interface between (immiscible) phases and belongs to the family of interface capturing methods. It was validated using the cases for which the exact solutions e...

A domestic unmanned aerial vehicle (UAV) was built with the data acquisition capabilities. It is completely based on open-source projects which enables great level of customization. Two different data acquisition systems (DAS) were tested: a proprietary DAS and an in-house developed open platform DAS. Some measurements were presented and possible a...

In this paper we present a multiphase model which can be used to simulate phase change problems. The multiphase model resolves the interface between immiscible phases and belongs to the family of interface capturing methods. The resulting mathematical model was presented and was validated using the Stefan problem for which the exact solution exists...

Forum of young European researchers, organized by the European Commission under Marie Curie Programme