Showing papers by "University of Maribor published in 2003"
TL;DR: In this article, a narrow charmonium-like state produced in the exclusive decay process B+/--->K+/-pi(+)pi(-)J/psi has been observed, which has a mass of 3872.0+/-0.6(stat)+/- 0.5(syst) MeV.
Abstract: We report the observation of a narrow charmoniumlike state produced in the exclusive decay process B+/--->K+/-pi(+)pi(-)J/psi. This state, which decays into pi(+)pi(-)J/psi, has a mass of 3872.0+/-0.6(stat)+/-0.5(syst) MeV, a value that is very near the M(D0)+M(D(*0)) mass threshold. The results are based on an analysis of 152M B-Bmacr; events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of 10sigma.
1,294 citations
TL;DR: In this article, the first observation of the B-->D over barD(sJ)(2317) and B->D>D-s*gamma decays based on 123.8x10(6) B (B) was reported.
Abstract: We report the first observation of the B-->(D) over barD(sJ)(2317) and B-->(D) over barD(sJ)(2457) decays based on 123.8x10(6) B (B) over bar events collected with the Belle detector at KEKB. We observe the D-sJ(2317) decay to D(s)pi(0) and the D-sJ(2457) decay to the D(s)(*)pi(0) and D(s)gamma final states. We also set 90% C.L. upper limits for the decays D-sJ(2317)-->D-s*gamma, D-sJ(2457)-->D-s*gamma, D-sJ(2457)-->D(s)pi(0), and D-sJ(2457)-->D(s)pi(+)pi(-).
368 citations
Journal Article•
321 citations
TL;DR: In this article, a new optimization technique based on genetic algorithms (GA) for the determination of the cutting parameters in machining operations has been proposed, which can be integrated into an intelligent manufacturing system for solving complex machining optimization problems.
Abstract: The paper proposes a new optimization technique based on genetic algorithms (GA) for the determination of the cutting parameters in machining operations. In metal cutting processes, cutting conditions have an influence on reducing the production cost and time and deciding the quality of a final product. This paper presents a new methodology for continual improvement of cutting conditions with GA. It performs the following: the modification of recommended cutting conditions obtained from a machining data, learning of obtained cutting conditions using neural networks and the substitution of better cutting conditions for those learned previously by a proposed GA. Experimental results show that the proposed genetic algorithm-based procedure for solving the optimization problem is both effective and efficient, and can be integrated into an intelligent manufacturing system for solving complex machining optimization problems.
276 citations
TL;DR: The main cause of environmental damage is unsustainable production and con-sumption, especially in industrialized countries as discussed by the authors, and it is necessary to apply appropriate metrics that will enable these assessments.
Abstract: The main cause of environmental damage is unsustainable production and consumption, especially in industrialized countries. Achieving sustainable development will require changes in industrial processes, in the type and quantity of resources used, in the treatment of waste, in the control of emissions, and in the products produced. One of the difficulties in measuring the company’s level of sustainability is to determine which directions of change are leading towards sustainability. Hence, it is necessary to apply appropriate metrics that will enable these assessments. This paper presents indicators for assessing and promoting business sustainability — indicators of sustainable production. It first introduces the main concepts of such production and a set of necessary conditions that firms must fulfill in order to be sustainable. It identifies major functions of indicators and it proceeds to presenting the role of indicators.
256 citations
TL;DR: In this article, the authors report measurements of branching fractions for charged and neutral $B\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}K$ decays where the meson is reconstructed in the neutral channel.
Abstract: We report measurements of branching fractions for charged and neutral $B\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}K$ decays where the ${\ensuremath{\eta}}_{c}$ meson is reconstructed in the ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$, ${K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$, ${K}^{*0}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, and $p\overline{p}$ decay channels. The neutral ${B}^{0}$ channel is a $CP$ eigenstate and can be used to measure the $CP$ violation parameter $\mathrm{sin} 2{\ensuremath{\varphi}}_{1}$. We also report the first observation of the ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}{K}^{*0}$ mode. The results are based on an analysis of $29.1\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ of data collected by the Belle detector at KEKB.
236 citations
TL;DR: In this paper, the authors presented the extraction of antioxidants from Melissa officinalis leaves with ethanol and showed that the intraparticle diffusion was the rate-governing step of the extraction process.
215 citations
TL;DR: In this article, a review of recent advances in particle formation and design of solid particles and powdery composites with unique properties is presented, focusing on recent advances and on fundamentals of these processes and their applications.
Abstract: Major recent advances. Particle formation and design of solid particles and powdery composites with unique properties is at the moment a major development of supercritical fluids (synonyms: dense gasses, dense fluids, high pressure) applications. This review will focus on recent advances and on fundamentals of these processes and their applications.
172 citations
TL;DR: A neural network-based approach to complex optimization of cutting parameters by means of the neural networks taking into consideration the technological, economic and organizational limitations is proposed and developed to reach higher precision of the predicted results.
Abstract: Optimum selection of cutting conditions importantly contribute to the increase of productivity and the reduction of costs, therefore utmost attention is paid to this problem in this contribution. In this paper, a neural network-based approach to complex optimization of cutting parameters is proposed. It describes the multi-objective technique of optimization of cutting conditions by means of the neural networks taking into consideration the technological, economic and organizational limitations. To reach higher precision of the predicted results, a neural optimization algorithm is developed and presented to ensure simple, fast and efficient optimization of all important turning parameters. The approach is suitable for fast determination of optimum cutting parameters during machining, where there is not enough time for deep analysis. To demonstrate the procedure and performance of the neural network approach, an illustrative example is discussed in detail.
164 citations
TL;DR: In this article, the authors applied neutron radiography (NR) to study liquid transport processes in concrete and found that the ratio between the capillarity coefficient and sorptivity depends upon the combination of liquid and solid phases.
128 citations
TL;DR: In this paper, the authors search for a CP violation signature arising from an electric dipole moment (dτ) of the τ lepton in the e+e- → τ+τ- reaction.
TL;DR: In this article, the main result of this paper is that the centralizer of a 2-torsion free semiprime ring is a centralizer whose mapping is an additive mapping such that 2T(xyx) = T(x)yx + xyT(x).
Abstract: The main result of this paper is the following. Let R be a 2-torsion free semiprime ring and let $ T : R \rightarrow R $ be an additive mapping such that $ 2T(xyx) = T(x)yx + xyT(x) $ holds for all $ x,y \in R $. Then T is a centralizer.
TL;DR: The heat-capacity response at the weakly first order I-N and continuous N-SmA phase transitions gradually approaches the tricritical-like and three-dimensional XY behavior, respectively.
Abstract: We present a calorimetric study of the phase behavior of octylcyanobiphenyl (8CB) liquid crystal confined to a controlled-pore glass (CPG). We used CPG matrices with characteristic void diameters ranging from 400 to 20 nm. In bulk we obtain weakly first-order isotropic to nematic (I-N) phase transition and nearly continuous character of the nematic to smectic-A (N-SmA) phase transition. In all CPG matrices the I-N transition remains weakly first order, while the N-SmA one becomes progressively suppressed with decreasing CPG pore radius. With decreased pore diameters both phase transition temperatures monotonously decrease following similar trends, but increasing the stability range of the N phase. The heat-capacity response at the weakly first order I-N and continuous N-SmA phase transitions gradually approaches the tricritical-like and three-dimensional XY behavior, respectively. The main observed features were explained using a bicomponent single pore type phenomenological model.
TL;DR: In this paper, a systematic analysis of structural characteristics (molecular and fine structure) and their influence on fiber properties was carried out, and the results demonstrated that the adsorption properties of cellulosic fibers depend mainly on the void fraction.
Abstract: Comparative investigations of the new lyocell and conventional viscose and modal fibers attempt to explain the reasons for differences in the molecular and fine structure of these fibers This research is a systematic analysis of structural characteristics (molecular and fine structure) and their influence on fiber properties The analysis shows that lyocell fibers consist of longer molecules, they have a greater degree of crystallinity, their slighter but rather longer crystallites are oriented in the fiber axis direction, and their void structure is similar to that of viscose fibers Differences in the molecular and fine structure of these fibers cause different mechanical and sorption properties Good mechanical properties are a function of the structure of lyocell fibers, especially with the highest orientation factor and crystallinity index Sorption properties place lyocell fibers somewhere between viscose and modal fibers Our results demonstrate that the adsorption properties of cellulosic fibers depend, except for the less ordered amorphous regions, predominantly on the void fraction
TL;DR: It is argued that the real options framework is an appropriate heuristic for managing the process of capability development and a case study of a manufacturing operation is used to illustrate the ideas.
Abstract: The resource‐based view (RBV) and the dynamic‐capabilities approach (DCA) have emerged as two important frameworks in strategic management that seek to explain why firms are different. In recent years operations management scholars have sought to integrate both RBV and DCA within the field's epistemological orientation to provide normative frameworks for practising managers. This paper argues that the structure of resources and capabilities are such that they present impediments to normative prescriptions. Using ideas from complex systems it argues that any framework for thinking about resource accumulation and capability development must take account of uncertainty and knowledge imperfections in the system. The paper contends that the real options framework is an appropriate heuristic for managing the process of capability development and a case study of a manufacturing operation is used to illustrate our ideas.
TL;DR: In this article, the decay amplitudes for the different helicity states are measured from the angular distributions of final state particles in the transversity basis. And they are shown to be consistent with zero.
Abstract: We present the first measurement of decay amplitudes in $B\ensuremath{\rightarrow}\ensuremath{\varphi}{K}^{*}$ and measurements of branching fractions in $B\ensuremath{\rightarrow}\ensuremath{\varphi}{K}^{(*)}$ decays based on $78.1\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ of data recorded at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ storage ring. The decay amplitudes for the different $\ensuremath{\varphi}{K}^{*0}$ helicity states are measured from the angular distributions of final state particles in the transversity basis. The longitudinal and transverse complex amplitudes are $|{A}_{0}{|}^{2}=0.43\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.04$, $|{A}_{\ensuremath{\perp}}{|}^{2}=0.41\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.04$, $\mathrm{arg} ({A}_{\ensuremath{\parallel}})=\ensuremath{-}2.57\ifmmode\pm\else\textpm\fi{}0.39\ifmmode\pm\else\textpm\fi{}0.09$, and $\mathrm{arg} ({A}_{\ensuremath{\perp}})=0.48\ifmmode\pm\else\textpm\fi{}0.32\ifmmode\pm\else\textpm\fi{}0.06$. The direct $CP$-violating asymmetries are found to be consistent with zero.
TL;DR: In this article, different types of bursting Ca 2+ oscillations are classified into several subtypes based on the dynamics of separated fast and slow subsystems, the so-called fast-slow burster analysis.
Abstract: In the paper different types of bursting Ca 2+ oscillations are presented. We analyse bursting behaviour in four recent mathematical models for Ca 2+ oscillations in non-excitable cells. Separately, regular, quasi-periodic, and chaotic bursting Ca 2+ oscillations are classified into several subtypes. The classification is based on the dynamics of separated fast and slow subsystems, the so-called fast–slow burster analysis. For regular bursting Ca 2+ oscillations two types of bursting are specified: Point–Point and Point–Cycle bursting. In particular, the slow passage effect, important for the Hopf–Hopf and SubHopf–SubHopf bursting subtypes, is explained by local divergence calculated for the fast subsystem. Quasi-periodic bursting Ca 2+ oscillations can be found in only one of the four studied mathematical models and appear via a homoclinic bifurcation with a homoclinic torus structure. For chaotic bursting Ca 2+ oscillations, we found that bursting patterns resulting from the period doubling root to chaos considerably differ from those appearing via intermittency and have to be treated separately. The analysis and classification of different types of bursting Ca 2+ oscillations provides better insight into mechanisms of complex intra- and intercellular Ca 2+ signalling. This improves our understanding of several important biological phenomena in cellular signalling like complex frequency–amplitude signal encoding and synchronisation of intercellular signal transduction between coupled cells in tissue.
TL;DR: In this article, a computational numerical model for contact fatigue damage analysis of mechanical elements is presented, where a homogenous and elastic material model is assumed in the framework of the finite element method analysis.
TL;DR: In this article, an improved measurement of CP-violation parameters in B0-->phiK(0)(S), K(+)K(-)K( 0)(S) and eta(') K(0)S decays was presented based on a 140 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider.
Abstract: We present an improved measurement of CP-violation parameters in B0-->phiK(0)(S), K(+)K(-)K(0)(S), and eta(')K(0)(S) decays based on a 140 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters for each of the three modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. We find that the observed CP asymmetry in the B-->phiK(0)(S) decay differs from the standard model (SM) expectation by 3.5 standard deviations, while the other cases are consistent with the SM.
TL;DR: The results of testing and of sensitivity analysis of the model prove that a trade-off exists between the replacement related cost and the inventory related cost, and indicates that separate optimization of preventive maintenance policy and spare-provisioning policy does not ensure minimal total cost of system maintenance.
Abstract: This paper considers the problem of joint optimization of "preventive maintenance" and "spare-provisioning policy" for system components subject to wear-out failures. A stochastic mathematical model is developed to determine the jointly optimal "block replacement" and "periodic review spare-provisioning policy." The objective function of the model represents the s-expected total cost of system maintenance per unit time, while the preventive replacement interval and the maximal inventory level are chosen as the decision variables. The objective function of the model is in an analytic form with parameters easily obtainable from field data. The model has been tested using field data on electric locomotives in Slovenian Railways. The calculated optimal values of the model decision variables are realistic. "Sensitivity analysis of the model" shows that the model is relatively insensitive to moderate changes of the parameter values. The results of testing and of sensitivity analysis of the model prove that a trade-off exists between the replacement related cost and the inventory related cost. The jointly optimal preventive replacement interval defined by this model differs appreciably from the corresponding interval determined by the conventional model where only replacement related costs are considered. Also, the results of the sensitivity analysis show that even minor modification of the value of each model decision variable (without the appropriate adjustment of the value of the other decision variable) can lead to important increase of the s-expected total cost of system maintenance. This indicates that separate optimization of preventive maintenance policy and spare-provisioning policy does not ensure minimal total cost of system maintenance. This model can be readily applied to optimize maintenance procedures for a variety of industrial systems, and to upgrade maintenance policy in situations where block replacement preventive maintenance is already in use.
TL;DR: In this paper, a non-specific photometric metal ion indicator Pyrocatechol Violet (PV) was tested for its potential use in a metal-sensitive optrode membrane.
Abstract: A non-specific photometric metal ion indicator Pyrocatechol Violet (PV) was tested for its potential use in a metal-sensitive optrode membrane. The water soluble indicator was lipophilised in the form of an ion pair with tetraoctylammonium cation (TOA), and subsequently immobilised in a plasticised PVC membrane. The spectral response of the membrane in the presence of various transition metal ions was studied. It was found that the ability of PV to form complexes with metal ions significantly reduced following immobilisation, with the exception of Cu(II). A number of factors responsible for the improved selectivity and high sensitivity of immobilised PV towards Cu(II) were identified. Amongst those, the most important is the presence of quaternary ammonium salt in the membrane which induced a significant bathochromic shift of the PV–Cu(II) chelate absorption maximum, as well as the intensification of the chelate absorption band. The membrane responds to Cu(II) irreversibly by changing colour from yellow to green (absorption maximum at 740 nm), and typically, an exposure time of 10 min enables the determination of Cu(II) in the 1–100 μM range. A comparison of selectivity and sensitivity characteristics between the water soluble form of the indicator and the immobilised form was performed, and the effects of pH and lipophilic surfactant additives on the response mechanism are discussed.
TL;DR: In this article, a new integrated genetic programming and genetic algorithm approach was proposed to predict surface roughness in end-milling, where four independent variables, spindle speed, feed rate, depth of cut, and vibrations, were measured.
Abstract: In this article we propose a new integrated genetic programming and genetic algorithm approach to predict surface roughness in end-milling. Four independent variables, spindle speed, feed rate, depth of cut, and vibrations, were measured. Those variables influence the dependent variable (i.e., surface roughness). On the basis of training data set, different models for surface roughness were developed by genetic programming. The floating-point constants of the best model were additionally optimized by a genetic algorithm. Accuracy of the model was proved on the testing data set. By using the proposed approach, more accurate prediction of surface roughness was reached than if only modeling by genetic programming had been carried out. It was also established that the surface roughness is most influenced by the feed rate, whereas the vibrations increase the prediction accuracy.
TL;DR: A system for VRML model visualisation that enables changes in the configuration file, which is written in XML, and that automatically reviews the model including the functional behaviour is described.
Abstract: The use of virtual reality (VR) techniques in industry is subject to very high expectations, as VR has emerged as a popular technology for computer-human interfaces in order to master the shortcomings of CAD systems. 3D CAD models provide a natural way of sharing design information among participants in the production process. VRML is a tool specifically designed for creating 3D virtual worlds on the Web, where these synthetic worlds can give us the ability to visualise objects and navigate the virtual world. This paper describes a system for VRML model visualisation that enables changes in the configuration file, which is written in XML, and that automatically reviews the model including the functional behaviour. From the evaluated VRML model, the connection to a PDM system is provided with a list of elements and their material properties.
TL;DR: In this article, the authors report the observation of the flavor-changing neutral current decay B-->K*l(+l-) and an improved measurement of the decay B+l- where l represents an electron or a muon, with a data sample of 140 fb(-1) accumulated at the Y(4S) resonance with the Belle detector at KEKB.
Abstract: We report the observation of the flavor-changing neutral current decay B-->K*l(+l-) and an improved measurement of the decay B-->Kl(+l-), where l represents an electron or a muon, with a data sample of 140 fb(-1) accumulated at the Y(4S) resonance with the Belle detector at KEKB. The results for the branching fractions are B(B-->K*l(+l-))=(11.5(-2.4)(+2.6)+/-0.8+/-0.2)x10(-7) and B(B-->Kl(+l-))=(4.8(-0.9)(+1.0)+/-0.3+/-0.1)x10(-7), where the first error is statistical, the second is systematic and the third is from model dependence.
TL;DR: The authors' experience in using the tool shows the following didactical benefits: support for constructive learning, stimulation of exploratory and active learning, support for different learning styles and learning speed, increased motivation for learning, and better understanding of concepts.
Abstract: Compiler construction is a well-developed discipline since there is a long tradition of producing compilers supported by practical underlying theory and a large selection of textbooks. In the compiler construction course, students learn how to write a compiler by hand and how to generate a compiler using tools like lex and yacc. However, these tools usually have little or no didactical value. In this paper, the software tool LISA is described. It facilitates learning and conceptual understanding of compiler construction in an efficient, direct, and long-lasting way. The authors' experience in using the tool shows the following didactical benefits: support for constructive learning, stimulation of exploratory and active learning, support for different learning styles and learning speed, increased motivation for learning, and better understanding of concepts.
TL;DR: In this paper, the first observation of the charmless vector-vector decay process was reported using the Belle detector at the KEKB asymmetric e(+)e(-) collider operating at the Y(4S) resonance.
Abstract: We report the first observation of the charmless vector-vector decay process B-/+-->rho(-/+)rho(0). The measurement uses a 78 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric e(+)e(-) collider operating at the Y(4S) resonance. We obtain a branching fraction of B (B-/+-->rho(-/+)rho(0))=[31.7+/-7.1(stat)(-6.7)(+3.8)(syst)]x10(-6). An analysis of the rho helicity-angle distributions gives a longitudinal polarization fraction of Gamma(L)/Gamma=0.95+/-0.11(stat)+/-0.02(syst). We also measure the direct-CP-violating asymmetry A(CP)(B-/+-->rho(-/+)rho(0))=0.00+/-0.22(stat)+/-0.03(syst).
TL;DR: The first measurement of the branching fraction for the inclusive decay B → X s l + l -, where l is either an electron or a muon, and X s is a hadronic recoil system that contains an s quark, was reported in this article.
Abstract: We report the first measurement of the branching fraction for the inclusive decay B → X s l + l - , where l is either an electron or a muon, and X s is a hadronic recoil system that contains an s quark. We analyzed a data sample of 65.4 x 10 6 B meson pairs collected with the Belle detector at the KEKB e + e - asymmetric-energy collider. We find B(B → X s l + l - ) = [6.1 ′ 1.4(stat) + 1 . 4 - 1 . 1 (syst)] × 10 - 6 for dilepton masses greater than 0.2 GeV/c 2 .
TL;DR: Among speaker-dependent, monolingual, and multilingual emotion recognition, the difference between emotion Recognition with all high-level features and emotion recognition with database-specific emotional features is smallest for mult bilingual emotion recognition—3.84%.
Abstract: This paper presents and discusses an analysis of multilingual emotion recognition from speech with database-specific emotional features. Recognition was performed on English, Slovenian, Spanish, and French InterFace emotional speech databases. The InterFace databases included several neutral speaking styles and six emotions: disgust, surprise, joy, fear, anger and sadness. Speech features for emotion recognition were determined in two steps. In the first step, low-level features were defined and in the second high-level features were calculated from low-level features. Low-level features are composed from pitch, derivative of pitch, energy, derivative of energy, and duration of speech segments. High-level features are statistical presentations of low-level features. Database-specific emotional features were selected from high-level features that contain the most information about emotions in speech. Speaker-dependent and monolingual emotion recognisers were defined, as well as multilingual recognisers. Emotion recognition was performed using artificial neural networks. The achieved recognition accuracy was highest for speaker-dependent emotion recognition, smaller for monolingual emotion recognition and smallest for multilingual recognition. The database-specific emotional features are most convenient for use in multilingual emotion recognition. Among speaker-dependent, monolingual, and multilingual emotion recognition, the difference between emotion recognition with all high-level features and emotion recognition with database-specific emotional features is smallest for multilingual emotion recognition—3.84%.
Abstract: The enzymes (lipases from Candida rugosa and porcine pancreas) were immobilized on silica aerogels by sol–gel procedure followed by supercritical drying with CO2. Such immobilized enzymes were used as biocatalysts for esterification in supercritical CO2 and near critical propane at 40 °C and 100 bar. It was found out that the initial reaction rates in propane rose two to three times in comparison with the same reaction, catalyzed by free lipase. SC CO2 deactivated the non-immobilized lipase in reaction mixture while with the immobilized enzyme the conversion was 35%. The initial reaction rates in propane were 20 times higher than in water medium due to the properties of propane as a medium for esterification of fatty acids.
TL;DR: In this article, an asynchronous electric motor with a very thin rotor was applied to support the turbocharger during the transient operation of an automotive diesel engine, and the experimental work of matching an electric motor to an engine is rather expensive; it was therefore decided to determine general characteristic of the electric motor separately through experiments, whereas transient response of the turbocharged and intercooled diesel engine was simulated by a zero-dimensional filling and emptying computer simulation method.
Abstract: Turbocharging and subsequent charge cooling of the working medium usually causes increase of the mean effective pressure in an automotive diesel engine Poor performance during the engine load increase is attributed to the nature of energy exchange between the engine and the turbocharger Filling of the intake and exhaust manifolds, as well as consequent increase of the pressure and acceleration of the rotating components of the turbocharger require a certain period of time Dynamic performance of the turbocharger can be substantially improved by means of an electric motor attached directly to the turbo shaft A new concept of asynchronous electric motor with a very thin rotor was applied to support the turbocharger during the transient operation of the engine The experimental work of matching an electrically assisted turbocharger to an engine is rather expensive; it was therefore decided to determine general characteristic of the electric motor separately through experiments, whereas transient response of the turbocharged and intercooled diesel engine was simulated by a zero-dimensional filling and emptying computer simulation method A lot of experimentally obtained data and empirical formulae for the compressor, gas turbine, flow coefficients of the engine valves, intercooler, high-pressure fuel pump with the pneumatic control device (LDA), combustion parameters, etc, were applied to overcome deficiency introduced by the zero-dimensional simulation model As the result a reliable and accurate program compatible with the experimental results in steady and transient engine operation was developed and is presented in the work Faster transient response, ie, better load acceptance of the engine was obtained by applying an adequate electric motor to assist the turbocharger; three versions of electric motors with different torque to mass moment of inertia ratios and different operating regimes were introduced in the simulation program to investigate their influence on the transient behavior of the engine