Dževad Bibić

• PhD
• Professor (Full) at University of Sarajevo

This paper deals with the analysis of challenges and perspectives of the transition to electric vehicles as a sustainable solution for the transport sector in the context of global energy challenges and the need to reduce negative environmental impacts. With an emphasis on the energy situation in Bosnia and Herzegovina, the paper explores the possi...

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...

Reducing overall energy consumption and the negative impact on the environment is one of the basic directions in the development of modern society. For this reason, modern vehicles must be as efficient as possible. Even a small increase in the efficiency of an individual vehicle leads to a large overall reduction in energy consumption. Energy loses...

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...

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...

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...

Traffic jams and resulting air pollution have become severe problem in world urban areas long time ago. Fast growing number of vehicle in recent years, and inadequate development of traffic infrastructure, made these problems even worse in cities of Bosnia and Herzegovina. To start solving these problems, it will be useful to know real traffic cond...

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...

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...

ELECTRIC KARTING – FROM AN IDEA TO THE REALISATION Boran Pikula 1*, Dževad Bibić 2, Ivan Filipović 3, Mirza Smailbegović 4 Received: October 2016 Revised November 2016 Accepted December 2016 RESEARCH ARTICLE ABSTRACT: It is certain that the first steps of the vehicle drives each individual person were made in karting vehicle. Additional adrenaline...

ABSTRACT: Period of ignition delay in diesel engines is a very important parameter of the combustion process due to its direct impact on the intensity of heat release, as well as its indirect impact on the noise and exhaust emissions of the engine. Due to the complexity of the self-ignition process of heterogeneous mixtures of fuel and air in the d...

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...

One of the main reasons of fatigue of the IC engine crankshaft, which inevitably leads to its failure, is the occurrence of high amplitudes of twist angle due to torsional vibrations. Amplitudes of twist angle due to torsional vibrations are particularly pronounced in vibration resonant modes of the crankshaft including crank-gear and other associa...

It is certain that the first steps of the vehicle drives each individual person were made in karting vehicle. Additional adrenaline and increase driving pleasure gives extremely high noise and the smell of combustion products that may still endure when the ride takes place on an open track during sunny days. However, for many years karting rides ta...

Investigation of fuel flows inside the injector is the main topic from early beginnings of development of diesel fuel injection systems. Due to complex inside design of injector, a numerous different experimental and numerical methods have been developed and used in past. In case of 1D numerical modeling, a special attention was dedicated to high p...

The description of the combustion process in internal combustion engines is typically performed through so-called combustion parameters, such as: the maximum combustion pressure, maximum temperature of the cycle, crankshaft angle of the start of combustion, the angular interval of duration of combustion, the heat release characteristics, thee incre...

The use of fuels from renewable energy sources is no longer a matter of individual commitment to reduce emissions contributing to air pollution from exhausts of road vehicles, but a matter of comprehensive strategy to improve the foundation and development of the global energy sector, and to provide a targeted contribution to the reduction of envir...

In the development and application of highly dynamic mechanical systems, major problems can arise from usually unwanted accompanying processes, such as torsional vibrations. The internal combustion engine is a typical dynamic system with a high probability of fracture of a system part due to the effects of torsional vibrations. In engineering pract...

The main role in air/fuel mixture formation at the IC Diesel engines has the energy in-troduced by fuel into the IC engine that is the characteristics of spraying fuel into the combustion chamber. The characteristic can be defined by the spray length, the spray cone angle, and the physical and chemical structure of fuel spray by different sections....

In principle, emission reduction of toxic substances in exhaust gas of IC diesel engines can be achieved at three places: before, in and after the IC engine. The common approach is the introduction of catalytic exhaust systems, valve timing, fuel mixture preparation and combustion modeling, as well as using fuels the chemical composition of which p...

In the development of internal combustion engine as propulsion systems for road vehicles, a large emphasis is on increasing the efficiency by means of down-sizing. On the one hand it requires the reduction of specific weight and specific volume of internal combustion engine, that includes reducing mass of individual parts like the crank mechanism,...

Proces izgaranja goriva u motorima s unutarnjim izgaranjem (SUI) najviše ovisi o pripravi gorive smjese i uvjetima u kojima se odvija miješanje. Proces miješanja goriva i zraka može se analizirati preko unesene energije gorivom i zrakom, u odnosu na potrebnu energiju za racionalno formiranje smjese gorivo-zrak. Za kvalitetu smjese gorivo-zrak, kod...

A permanent race for achieving low pollutants emissions in exhaust gases from the IC engines is characterized by introduction of new technical and technological solutions in fuel injection systems, improvement of combustion process, additional treatment of exhaust gases, as well as use of alternative fuels. An advantage in use of alternative fuels...

Klizni ležajevi na radilici motora sa unutarnjim izgaranjem, a posebno na letećim rukavcima, su jako opterećeni elementi. Zbog toga je za njihovo pravilno funkcioniranje potrebno pažljivo definirati radne uvjete, gdje je kvaliteta ulja jedan od vrlo bitnih čimbenika. Sa aspekta rada kliznih ležajeva bitno je osigurati minimalnu promjenu vizkoziteta...

Light duty vehicles become more popular in goods distribution, especially in urban areas like downtowns or zones where traffic is limited or closed completely. In the same time, use of light duty vehicles is reasonable in case of non-stationary vehicle motions like acceleration and braking due to traffic jams and traffic lights. These situations le...

Introducing fuels from renewable energy sources in form of blends or pure fuels has its purpose in the tendency of saving conventional energy sources and reduction of global CO 2 emission. However, in dependence of kind of renewable energy source the fuels are obtained, it is to expect differences in pollutant emissions in reference to conventional...

Introducing fuels from renewable energy sources in form of blends or pure fuels has its purpose in the tendency of saving conventional energy sources and reduction of global CO2 emission. However, in dependence of kind of renewable energy source the fuels are obtained, it is to expect differences in pollutant emissions in reference to conventional...

An ignition delay is a very complex process which depends on agreat number of parameters. In practice, definition of the ignition delay is based on the use of correlation expressions. However, the correlation expressions have very often limited application field. This paper presents a new correlation which has been developed during the research pro...

Constant lowering of natural reserves of fossil fuels as well as continuous increasing of its exploitation costs influences more intensive researching in finding alternative energy recourses that are able to decrease an import dependent of expensive raw oil and its products from one side and give contribution to decreasing toxic emission as a produ...

Sažetak Svakodnevno smanjivanje prirodnih rezervi goriva fosilnog porijekla, kao i neprestani porast troškova njihove eksploatacije uvjetuje sve intenzivnija istraživanja o mogućim alternativnim izvorima energije koji bi s jedne strane smanjili ovisnost o uvozu skupe sirove nafte i njezinih proizvoda, a ujedno doprinijeli smanjenju emisije toksični...

Abstract One of the most influential factors in the process of environmental pollution is road transport, i.e. emission of gaseous pollutants from road vehicles. An especially pronounced problem is the air pollution in urban areas, with a high concentration of road vehicles having very different driving regimes. The largest influence on pollutants...

This paper describes the procedure for modeling and calculating the parameters of the torsional-oscillatory system equivalent to multi-cylinder in-line, water-cooled diesel engines in heavy-duty vehicles. As a result of a literature search and our own investigation we present models and algorithms for defining the following parameters: the moments...