bluuebunny/crossref_metadata_2025_split huggingface dataset:
Merely a threat? Worldwide transformation as a chance of development - psychological reflection
Authors: Ledzińska Maria 
Published: April 2012

Merely a threat? Worldwide transformation as a chance of development - psychological reflection
The author considers the psychological aspects of globalisation, drawing attention to the possible effects of worldwide transformations. She presents definition problems and characterises the main currents and mechanisms of globalisation at the turn of the 20th and 21st century. Several standpoints of contemporaneity researchers concerning the evaluation of the effects of undergoing transformations have also been recalled. Noticing the diverse effects for development and the functioning of individuals and groups, she concentrates on a selected aspect of the living environment, namely, on diversity. She formulates the thesis that the heterogeneity of the environment, which constitutes a characteristic of globalisation, stimulates development in its various phases and fields, optimising particularly the functioning of reflective persons who enter into dialogue with contemporaneity.
Transient stability analysis and control of power systems with considering flux decay by energy function approach
Authors: Lu D. , Zhang X. 
Published: April 2012

Transient stability analysis and control of power systems with considering flux decay by energy function approach
In this paper, transient stability of power systems with structure preserving models is considered. A Hamiltonian function which can be regarded as a Lyapunov function for the system is proposed. Based on this, the influence of flux decay dynamics, especially during a fault, on transient stability is analyzed. With the increase of load power, the variation of stability boundary in the rotor angle/E'q plane is shown. The Energy-based excitation control, aiming at injecting additional damping into the post-fault system may reduce the critical clearing time (CCT). This can be demonstrated by the comparison of different flux decay dynamics in the fault-on condition, and the reason is illustrated by the relationship between rotor angle/E'q and the stability boundary. An improved control strategy is proposed and applied to increase the CCT. Simulation results verify that improvement is obtained both in transient stability and dynamic performance.
Positive fractional continuous-time linear systems with singular pencils
Authors: Kaczorek T. 
Published: April 2012

Positive fractional continuous-time linear systems with singular pencils
A method for checking the positivity and finding the solution to the positive fractional descriptor continuous-time linear systems with singular pencils is proposed. The method is based on elementary row and column operations of the fractional descriptor systems to equivalent standard systems with some algebraic constraints on state variables and inputs. Necessary and sufficient conditions for the positivity of the fractional descriptor systems are established.
Implementation of MUSCL-Hancock method into the C++ code for the Euler equations
Authors: Murawski K. , Murawski K. , Stpiczyński P. 
Published: April 2012

Implementation of MUSCL-Hancock method into the C++ code for the Euler equationsIn this paper we present implementation of the MUSCL-Hancock method for numerical solutions of the Euler equations. As a result of the internal complexity of these equations solving them numerically is a formidable task. With the use of the original C++ code, we developed and presented results of a numerical test that was performed. This test shows that our code copes very well with this task.
Overheat protection circuit for high frequency processors
Authors: Frankiewicz M. , Kos A. 
Published: April 2012

Overheat protection circuit for high frequency processors
The paper describes design and structure of the overheat protection circuit based on the PTAT sensors. The digital core of the system is driven by a 3-bit information generated by the structure. As a result, behaviour of the core differs for each temperature. The circuit was designed in LF CMOS 0.15 μm technology using full-custom technique. The presented paper focuses especially on the structure of the overheat protection circuit and simulations results of the functional blocks of the system. Layout and some parameters of the circuit are also considered.
Performance analysis of the sensorless adaptive sliding-mode neuro-fuzzy control of the induction motor drive with MRAS-type speed estimator
Authors: Orlowska-Kowalska T. , Dybkowski M. 
Published: April 2012

Performance analysis of the sensorless adaptive sliding-mode neuro-fuzzy control of the induction motor drive with MRAS-type speed estimatorThis paper discusses a model reference adaptive sliding-mode control of the sensorless vector controlled induction motor drive in a wide speed range. The adaptive speed controller uses on-line trained fuzzy neural network, which enables very fast tracking of the changing speed reference signal. This adaptive sliding-mode neuro-fuzzy controller (ASNFC) is used as a speed controller in the direct rotor-field oriented control (DRFOC) of the induction motor (IM) drive structure. Connective weights of the controller are trained on-line according to the error between the actual speed of the drive and the reference model output signal. The rotor flux and speed of the vector controlled induction motor are estimated using the model reference adaptive system (MRAS) - type estimator. Presented simulation results are verified by experimental tests performed on the laboratory-rig with DSP controller.
Estimation and tracking of fundamental, 2nd and 3d harmonic frequencies for spectrogram normalization in speech recognition
Authors: Fujimoto K. , Hamada N. , Kasprzak W. 
Published: April 2012

Estimation and tracking of fundamental, 2nd and 3d harmonic frequencies for spectrogram normalization in speech recognitionA stable and accurate estimation of the fundamental frequency (pitch,F0) is an important requirement in speech and music signal analysis, in tasks like automatic speech recognition and extraction of target signal in noisy environment. In this paper, we propose a pitch-related spectrogram normalization scheme to improve the speaker - independency of standard speech features. A very accurate estimation of the fundamental frequency is a must. Hence, we develop a non-parametric recursive estimation method ofF0 and its 2nd and 3d harmonic frequencies in noisy circumstances. The proposed method is different from typical Kalman and particle filter methods in the way that no particular sum of sinusoidal model is used. Also we tend to estimate F0 and its lower harmonics by using novel likelihood function. Through experiments under various noise levels, the proposed method is proved to be more accurate than other conventional methods. The spectrogram normalization scheme makes a mapping of real harmonic structure to a normalized structure. Results obtained for voiced phonemes show an increase in stability of the standard speech features - the average within-phoneme distance of the MFCC features for voiced phonemes can be decreased by several percent.
The model of end-to-end call setup time calculation for Session Initiation Protocol
Authors: Gutkowski P. , Kaczmarek S. 
Published: April 2012

The model of end-to-end call setup time calculation for Session Initiation ProtocolEnd-to-end call setup delay is one of the most important grade of service (GoS) parameters for VoIP networks with Session Initiation Protocol (SIP). A typical subscriber wants to have a connection established as soon as possible. From the operator's perspective call setup time is also crucial because he needs to know how probability of successful packet transmission on SIP links is related to a call setup delay. Then he can make calculations how many resources are needed to guarantee such a transmission. In this paper we proposed the model for end-to-end call setup time calculation. The fundamentals of the model are to check all or almost all (highly probable) possible situations during the call setup. Formulas for calculation are included and results of numerical calculation are presented. Comparison against the values obtained from the simulation shows that it is possible to make calculations of end-to-end call setup time and prepare the discrete cumulative distribution function for a trapezoid model in reasonable time using the proposed model.
Reactive compensator synthesis in time-domain
Authors: Siwczyński M. , Jaraczewski M. 
Published: April 2012

Reactive compensator synthesis in time-domain
The source reactive-current compensation is crucial in the energy transmission efficiency. The compensator design in a frequency-domain has already been widely discussed and examined. This paper presents results of a study on how to design reactive compensators in a time-domain. It is the first time the reactive compensator has been designed in a time domain. The example of a compensator is presented.
Evolutionary algorithms for global parametric fault diagnosis in analogue integrated circuits
Authors: Jantos P. , Grzechca D. , Rutkowski J. 
Published: April 2012

Evolutionary algorithms for global parametric fault diagnosis in analogue integrated circuitsAn evolutionary method for analogue integrated circuits diagnosis is presented in this paper. The method allows for global parametric faults localization at the prototype stage of life of an analogue integrated circuit. The presented method is based on the circuit under test response base and the advanced features classification. A classifier is built with the use of evolutionary algorithms, such as differential evolution and gene expression programming. As the proposed diagnosis method might be applied at the production phase there is a method for shortening the diagnosis time suggested. An evolutionary approach has been verified with the use of several exemplary circuits - an oscillator, a band-pass filter and two operational amplifiers. A comparison of the presented algorithm and two classical methods - the linear classifier and the nearest neighborhood method - proves that the heuristic approach allows for acquiring significantly better results.
Rapid antenna design optimization using shape-preserving response prediction
Authors: Koziel S. , Ogurtsov S. , Szczepanski S. 
Published: April 2012

Rapid antenna design optimization using shape-preserving response prediction
An approach to rapid optimization of antennas using the shape-preserving response-prediction (SPRP) technique and coarse-discretization electromagnetic (EM) simulations (as a low-fidelity model) is presented. SPRP allows us to estimate the response of the high-fidelity EM antenna model, e.g., its reflection coefficient versus frequency, using the properly selected set of so-called characteristic points of the low-fidelity model response. The low-fidelity model, corrected by means of SPRP, is subsequently used to predict the optimal design. The design process is cost efficient because most operations are performed on the low-fidelity model. Performance of our technique is demonstrated using a dielectric resonator antenna and two planar wideband antenna examples. In all cases, the optimal design is obtained at a cost corresponding to a few high-fidelity simulations of the antenna under design.
Calculation of interval damping ratio under uncertain load in power system
Authors: Xing J. , Chen C. , Wu P. 
Published: April 2012

Calculation of interval damping ratio under uncertain load in power system
The problem of small-signal stability considering load uncertainty in power system is investigated. Firstly, this paper shows attempts to create a nonlinear optimization model for solving the upper and lower limits of the oscillation mode's damping ratio under an interval load. Then, the effective successive linear programming (SLP) method is proposed to solve this problem. By using this method, the interval damping ratio and corresponding load states at its interval limits are obtained. Calculation results can be used to evaluate the influence of load variation on a certain mode and give useful information for improvement. Finally, the proposed method is validated on two test systems.
A New Approach to Assessment of Infrastructure Projects on Urban Transport Systems
Authors: Griskeviciene Daiva , Griskevicius Algirdas , Griskeviciute-Geciene Ausrine 
Published: April 2012

A New Approach to Assessment of Infrastructure Projects on Urban Transport Systems

The scientific analysis of currently used assessment principles of the development on urban transport systems; subsystems on vehicles, passenger and freight transportations, special public services, pedestrian and bicyclists has been carried out. Each subsystem needs technical infrastructure, the set of informational and traffic control means. Moreover quantitative and qualitative development of transport infrastructure is necessary for appropriate operating of whole communication system. Unfortunately an increase in the level of automobilization, growing transport flows in urban territories and decreasing investment for the development of transport infrastructure are the main barriers for urban development. An uncontrolled increase in automobilization changed the character of the usage of urban territories, urban structure, stimulated the process of agglomeration and formed new problems.
The results of expert evaluation and statistical analysis highlighted the influence of each subsystem on the sustainable development of whole urban transport system by technical, traffic safety, social-economic, environmental and other specific aspects. Objects of technical infrastructure that should be treated as infrastructure of urban road transport system were identified. The results of statistics analysis allowed determine features of separate objects necessary to evaluate; assess and adjust separate stages, key principles and quantitative and qualitative criteria of assessment of the development on urban transport systems infrastructure.
Airport Benchmarking and Spatial Competition: A Critical Review
Authors: Dmitry Pavlyuk 
Published: April 2012

Airport Benchmarking and Spatial Competition: A Critical ReviewDuring the last two decades the European airport industry is liberalised and turned to competitive market environment. This fact attracts an increasing scientific and practical interest to analysis of airport efficiency and its determinants, as well as different aspects of airport competition. This paper contains a critical review of existing researches in these two areas - airport efficiency and spatial competition among airports. We analysed modern approaches to airport benchmarking, their advantages and shortcomings, and systematised a wide range of related academic studies. We paid special attention to empirical researches of spatial competition as a factor affecting airport efficiency. Despite the fact of a well-developed theory of spatial competition and signs of its growing effects in the airport industry, we discovered a lack of studies devoted to the relationship between airport efficiency and spatial competition.
The Research on Competitiveness of Road Transport Enterprises: Lithuanian Case
Authors: Lazauskas Jonas , Bureika Gintautas , Valiūnas Valdas , Pečeliūnas Robertas , Matijošius Jonas , Nagurnas Saulius 
Published: April 2012

The Research on Competitiveness of Road Transport Enterprises: Lithuanian Case
In the paper, various opinions of Lithuanian and foreign authors of scientific publications are reviewed and the criteria for assessing competitiveness of road transport are discussed upon. On assessment of competitiveness of services provided by Lithuanian road transport enterprises, not only technical options are taken into account. It is proposed to assess competitiveness of enterprises upon taking into consideration the total set of services provided as well as their quality and the marketing level of the enterprise. In the paper, the factors impacting competitiveness of road transport are discussed upon and the research works required for objective assessment of competitiveness of road transport are foreseen. A model for assessing competitiveness of road transport enterprises realized by the authors is provided. In the end of the paper, conclusions and recommendations are provided.
Influence of ridge cultivation and phacelia intercrop on weed infestation of root vegetables of the Asteraceae family
Authors: Błażewicz-Woźniak Marzena , Konopiński Mirosław 
Published: April 2012

Abstract
The field experiment focused on three high-inulin vegetable crops: chicory (Cichorium intybus L. var. sativum Bisch), black salsify (Scorzonera hispanica L.) and common salsify (Tragopogon porrifolius L.), and took into account two cultivation methods (flat soil and ridges) and a phacelia (Phacelia tanacetifolia L.) intercrop, the biomass of which was mixed with the soil during pre-winter ploughing. Cultivation without an intercrop served as the control. The studies aimed at evaluating the influence of ridge cultivation using a phacelia intercrop on the species composition and population of vegetable weeds as compared to traditional flat-soil cultivation with no intercrop. In total, 24 taxa in the primary and 31 taxa in the secondary weed populations (mostly characteristic for vegetable crops) were recorded in high-inulin species plantations. Monocarpic species such as Senecio vulgaris, Chenopodium album and Lamium amplexicaule dominated in the spring, while Stellaria media, Capsella bursa-pastoris and Urtica urens were most numerous at the end of the vegetation period. Applying phacelia as the intercrop and ploughing its biomass before winter significantly reduced the primary weed population for all of the cultivated crop species as compared to the no-intercrop cultivations. Phacelia grown as the intercrop reduced the occurrence of Senecio vulgaris, while favouring the development of Lamium amplexicaule. The cultivation system affected the primary weed infestation of vegetables, whereas it had no impact on the level of secondary weed infestation. At the beginning of the vegetation periods, fewer weeds grew in ridges than in the flat soil system. The crop species had no effect on the primary weed infestation, while it influenced weed numbers in the secondary. The lowest number of weeds was recorded in the secondary weed infestation of chicory, the well-developed leaf rosettes of which efficiently eliminated most of the weeds.
Effects of selected agronomical factors on the content of health-promoting compounds in spaghetti squash (Cucurbita pepo L. subsp. pepo)
Authors: Wadas Wanda , Mioduszewska Halina , Kalinowski Krzysztof 
Published: April 2012

Abstract
The study examined the effects of the sowing date (5, 15 and 25 May) and plant spacing (1 × 0.6 m, 1 × 0.8 m and 1 × 1 m) on the content of carotenoids and L-ascorbic acid in the fruits of two cultivars of spaghetti squash (‘Makaronowa Warszawska' and ‘Pyza’). The field experiment was carried out in central-eastern Poland. Fully mature spaghetti squash fruits were harvested from the beginning of September to the beginning of October. The content of total carotenoids and β-carotene was the greatest in the fruits of plants sown on 15 May. The sowing date did not affect the content of L-ascorbic acid. Increasing the plant spacing from 1 × 0.6 m to 1 × 1 m resulted in an increase of total carotenoid content, particularly for the spaghetti squash sown on 25 May. Plant spacing did not have a significant effect on the content of β-carotene and L-ascorbic acid. Fruits of the ‘Makaronowa Warszawska’ with light orange flesh contained more total carotenoids and β-carotene than fruits of the ‘Pyza’ with cream-coloured flesh. The content of L-ascorbic acid in the fruits of both cultivars did not differ significantly.
Airflow resistance in soybean
Authors: Kenghe R. , Nimkar P. , Shirkole S. , Shinde K. 
Published: April 2012

Airflow resistance in soybeanResistance of material to airflow is an important factor to consider in the design of a dryer or an aeration system. The airflow resistance of soybean was determined with the modified airflow resistance apparatus. It was found that pressure drop increased with increase in airflow rate, bulk density, bed depth and decreased with moisture content. Modified Shedd equation, Hukill and Ives equation and modified Ergun equation were examined for pressure drop prediction. Airflow resistance was accurately described by modified Shedd equation followed by Hukill and Ives equation and modified Ergun equation. The developed statistical model comprised of airflow rate, moisture content and bulk density could fit pressure drop data reasonably well.
Effects of thermal treatment on colour and texture of Typha latifolia L.
Authors: Zhang Min , Zhou Yun-hua , Wang Shaojin , Tang Juming 
Published: April 2012

Effects of thermal treatment on colour and texture of Typha latifolia L.
Through the analysis of the residual activity of peroxidase (POD), chromatic aberration, shear intensity and shear power, the effects of different thermal treatment times at 100°C on the POD, surface colour and texture of Typha latifolia L. were evaluated. The results showed that the activity of POD decreased with the increasing thermal treatment time at 100°C. The regeneration amount of POD increased first for some time and then started to decrease with the treatment time. Thermal treatment times 1.0 and 1.5 min at 100°C exhibited maximum regeneration of POD for the samples stored at 20 and 37°C, respectively. The sample had acceptable texture and surface colour when they were treated at 100°C for 4 min because the POD in the sample was inactivated to an acceptable level.
New trends for reference evapotranspiration and climatic water deficit
Authors: Paltineanu C. , Chitu E. , Mateescu E. 
Published: April 2012

New trends for reference evapotranspiration and climatic water deficitThe paper deals with the trend for Penman-Monteith reference evapotranspiration and climatic water deficit during the first decade of the 21st century in Southern Romaniavsthe 20th century. For the first half of the year the monthly evapotranspiration values were higher for the first decade of the 21st centuryvsthe means of the 20th century. However, the trend reverses for the second half of the year, but for the whole year the totals were higher for the first decade of the 21st centuryvsthe totals of the 20th century. The yearly temperature means in the first decade of the XXI century showed an increase in the three locations studied, respectively,vscentury XX. This warming is responsible to a great extent for the increase in evapotranspiration, and the relationship between evapotranspiration and temperature was highly significant. Water deficit decreased in Constanta and Pitesti, but there was a slight increase in water deficit in the same period in Bucharest-Baneasa. Water deficit increased in the first half of the year and decreased in the second half during the first decade of century XXI in all the three locations investigatedvscentury XX.
Simulation of magnetic field effect on a seed embryo cell
Authors: Socorro A. , García F. 
Published: April 2012

Simulation of magnetic field effect on a seed embryo cellThe plant seed embryo tissue cell, including the cell membrane and the intracellular and extracellular regions, was modelled as a spherical body. Equations for the three components in spherical coordinates were developed to calculate potassiumions flux in the presence of a stationary magnetic field. Simultaneous mathematical simulations of radial flux for potassium, calcium and chloride ions as well as membrane potential and osmotic pressure were calculated. Results obtained by computerized simulation showed that a magnetic field of 200 mT provoked some changes in cellular ionic concentration with respect to exposure time during first 30 s, which also impacted on the membrane potential and osmotic pressure values.