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Wyszukujesz frazę "Ivanov, R." wg kryterium: Autor


Tytuł:
Analytical research on the grip variation of two-axle car
Аналитическое исследование сцепления двухосного автомобиля
Autorzy:
Ivanov, R.
Powiązania:
https://bibliotekanauki.pl/articles/374143.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
tires grip
car grip
grip coefficient
przyczepność ogumienia
przyczepność samochodu
współczynnik przyczepności
Opis:
This paper presents a theoretical investigation on the decrease in grip coefficient of a car due to the car mass changes for three different running conditions- straightforward, motion in curve and braking. The grip of two types of cars - with forward and rear traction, equipped with three models of tires are studied. The results show a significant decrease of the grip coefficient in longitudinal and lateral directions.
Представлено теоретическое исследование уменьшения коэффициента сцепления автомобиля в результате перераспределения массы при трех разных режимах – прямолинейное движение, поворот и торможение. Исследован коэффициент сцепления автомобилей с передним и с задним движущим мостом, оборудованных тремя моделями шин. Результаты показывают значительное уменьшение коэффициентов сцепления в продольном и поперечном направлениях.
Źródło:
Transport Problems; 2016, 11, 4; 5-13
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tire wear modeling
Моделирование износа шин
Autorzy:
Ivanov, R.
Powiązania:
https://bibliotekanauki.pl/articles/375433.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
tire wear
wear modelling
zużycie opon
modelowanie zużycia
Opis:
On the basis of a known relationship, an enhanced model for specific tire wear per kilometer has been developed. It is appropriate for practical use - for evaluation of the influence of different factors. Two types of experiments have been carried out with a testing device - one without sideslip, but with a known longitudinal slip, and the other one with the same longitudinal slip but also with a known sideslip. As a result, the coefficients of the proportion of the developed model have been evaluated. After the model validation, an analytical investigation concerning the influence of tire pressure, sideslip and longitudinal slip on the tire wear has been carried out. The results are presented graphically.
На основе известной зависимости разработана модель относительного износа шин в зависимости от пробега. Она подходящая для практического использования – оценки влияния разных факторов. Два типа эксперимента проведены с помощью испытательной установки – один без поперечного увода и с известным продольным скольжением, а другой с тем самым скольжением, но и с известным уводом. В результате получены коэффициенты пропорциональности модели. После проверки модели, проведено аналитическое исследование влияния давления в шине, увода и продольного скольжения на относительный износ шины. Приведены графические результаты.
Źródło:
Transport Problems; 2016, 11, 3; 111-120
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of characteristics and thermal loading of LEB bulbs for automotive headlights
Autorzy:
Mashkov, P.
Gyoch, B.
Ivanov, R.
Powiązania:
https://bibliotekanauki.pl/articles/374509.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
LED auto lamps
LED
headlights
lampy samochodowe LED
reflektory
Opis:
The aim of the study is related to obtain real data for the LEDs’ thermal load and characteristics of several LED lamps types H4 and H7 for automotive headlights with different cooling system. Power consumption, temperature regimes of the LEDs’ operation, lamps’ radiation spectral distribution, and luminous flux of lamps for automobile headlights with active and passive cooling system at different ambient temperatures have been investigated. The obtained data under real conditions of operation in several cars have been verified. The results are compared with the data in promotional materials and the requirements of Regulations of the United Nations Economic Commission for Europe. Studies enable to evaluate the feasibility, advantages and disadvantages of LED lamps of this type when replacing standard halogen lamps in headlights.
Źródło:
Transport Problems; 2018, 13, 3; 85-95
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Primenenie andragogicheskojj modeli obuchenija na primere metodov sokhranenija drevesiny sredstvami na osnove naturalnykh veshhestv
Zastosowanie andragogicznego modelu nauczania na przykładzie technik zabezpieczania drewna środkami na bazie naturalnych substancji
Autorzy:
Blaszczak, I.
Lisiecka, E.
Mielnik, A.
Ivanov, R.
Powiązania:
https://bibliotekanauki.pl/articles/9160.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2015, 92
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy characteristics of citroen berlingo converted to electric vehicle
Autorzy:
Ivanov, R.
Sapundzhiev, M.
Kadikyanov, G.
Staneva, G.
Powiązania:
https://bibliotekanauki.pl/articles/374222.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
electric vehicle
conversion
energy consumption
pojazd elektryczny
przekształcenie
zużycie energii
Opis:
This report introduces the study results of a Citroen Berlingo converted into an electric car. It presents the energy properties of road and laboratory tests. Initially the structure of the converted car is described, and characteristics of the main car elements are given. Then, the power and energy characteristics of the converted car are obtained and analyzed. On the road, energy consumption at different constant speeds is registered. In addition, at laboratory, the energy consumption during the Special Cycle for Electric Vehicles and Driving Cycle ECE-15 has been obtained. A comparison of the Energy consumption of the studied car and serial BEV was done, and it shows good Energy efficiency of the converted car during the driving cycles.
Źródło:
Transport Problems; 2018, 13, 3; 151-161
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on electric bicycle energy efficiency
Исследование энергоэффективности электрического велосипеда
Autorzy:
Evtimov, I.
Ivanov, R.
Staneva, G.
Kadikyanov, G.
Powiązania:
https://bibliotekanauki.pl/articles/374709.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
electric bicycle
energy efficiency
energy consumption
rower elektryczny
efektywność energetyczna
zużycie energii
Opis:
The paper presents a construction of an experimental electric bicycle for evaluation of the energy efficiency. The bicycle is equipped with onboard computer which can store the information about motion and energy consumption. The result concerning power, energy consumption, recharging during brake process, etc. are given. Energy consumption for 3 typical city routes is studied.
В статье представлена конструкция экспериментального электрического велосипеда для оценки энергетической эффективности. Велосипед оснащен бортовым компьютером, который может хранить информацию о движении и потреблении энергии. Приведены результаты по вопросам мощности, потребления энергии, подзарядки во время процесса торможения и т.д. Изучено потребление энергии для 3 типичных городских маршрутов.
Źródło:
Transport Problems; 2015, 10, 3; 131-140
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental research on the wear of truck tire
Экспериментальное исследование износа шин грузового автомобиля
Autorzy:
Ivanov, R.
Georgiev, K.
Kadikyanov, G.
Staneva, G.
Powiązania:
https://bibliotekanauki.pl/articles/375080.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
tire wear
experimental research
truck tire
tire
zużycie opon
badania eksperymentalne
opony do ciężarówek
ciężarówka
Opis:
An experimental device and methodology for tire wear investigation are presented. An indirect method for wear evaluating is used. The experimental results in cases of straight motion with and without side slip are obtained. The distribution of wearing on tread pattern wide is evaluated in different running conditions.
Передставлены экспериментальная установка и методика оценки износа шин. Использован косвенный метод оценки износа. Получены экспериментальные результаты при движении при наличии и отсутствии бокового увода. Сделана оценка неравномерности износа по ширине шины при разных условиях движения.
Źródło:
Transport Problems; 2015, 10, 4; 91-98
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the dynamic parameters influence over the behavior of the two-section articulated vehicle during the lane change manoeuvre
Исследование влияния динамических параметров на поведение двухзвенного сочлененного автопоезда во время маневра перемены полосы движения
Autorzy:
Rusev, R.
Ivanov, R.
Staneva, G.
Kadikyanov, G.
Powiązania:
https://bibliotekanauki.pl/articles/374119.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
articulated vehicle
stability
lane change maneuver
simulation
pojazd przegubowy
stabilność
manewr zmiany pasa ruchu
symulacja
Opis:
The course stability and the steerability of the two-section wheeled vehicle at high velocities during the lane change manoeuvreare studied in this paper. Mechanic-mathematical model is developed, on which base simulation programmes are elaborated. Simulation studies of the course stability at different velocities depend on some constructive and exploitation factors are made by these models. Based on the simulation results an idea for an algorithm and a semi-active control system of the resistance in the pulling-supporting device is proposed.
В этой работе исследованы курсовая устойчивость и управляемость двухзвенного колесного автопоезда во время маневра перемены полосы движения с высокими скоростями . На основании предложенной механик о – математической модели, разработаны симуляционные программы . Спомощью этой модели проведены симуляции движения , показывающие зависимость курсовой устойчивости и упра вляемости от некоторых конструктивных и эксплуатационных факторов . В результате симуляций предложены алгоритм и полуактивная система управления сопротивлением седельно – сцепного устройства.
Źródło:
Transport Problems; 2016, 11, 1; 29-40
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical properties of maize seeds
Autorzy:
Hernandez, A.
Cruz, O.
Ivanov, R.
Dominguez, P.
Carballo, C.
Moreno, I.
Powiązania:
https://bibliotekanauki.pl/articles/25661.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
maize
optical absorption coefficient
photoacoustic spectroscopy
absorption coefficient
seed
optical property
raw material
Źródło:
International Agrophysics; 2011, 25, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser irradiation effects on field performance of maize seed genotypes
Autorzy:
Hernandez-Aguilar, C.
Dominguez-Pacheco, A.
Cruz-Orez, A.
Ivanov, R.
Carballo-Carballo, A.
Zepeda-Bautista, R.
Galindo Soria, L.
Powiązania:
https://bibliotekanauki.pl/articles/25093.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2009, 23, 4; 327-332
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal effects of laser irradiation on maize seeds
Autorzy:
Hernandez Aguilar, C.
Dominguez Pacheco, F.A.
Cruz Orea, A.
Ivanov Tsonchev, R.
Powiązania:
https://bibliotekanauki.pl/articles/26520.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
It is important to know the temperature changes in seeds that have been irradiated with laser light because this could have substantial practical and theoretical importance. Thus, the thermal effects of low intensity laser irradiation on seeds was studied, showing variation of temperature produced by laser light applied during 60 s on two maize seed genotypes, ‘Toluqueño’ and ‘Cacahuazintle’: crystalline and floury, respectively, under two different conditions: natural colour and dyed black, evaluating the temperature changes by a thermal camera. The optical absorption spectra and the non-radiative relaxation time of the seeds were obtained using photoacoustic spectroscopy. The results indicate that it is possible to produce temperature changes, detected by an infrared camera, in crystalline and floury seeds when theyare irradiated with a laser beam at a 650 nm wavelength and27.4 mW power. The highest variation of temperature in the seeds was obtained for the black-dyed condition, these variations being 5.56 and 9.28°C for crystalline and floury seeds, respectively. Among the seeds, in the dyed condition, the floury seed had the lower non-radiative relaxation time, the higher optical absorption coefficient and a lower optical penetration length at the laser wavelength (650 nm).
Źródło:
International Agrophysics; 2015, 29, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence of Cd0.7Mn0.3Te Crystals in Transverse Magnetic Field
Autorzy:
Brazis, R.
Barauskaitė, L.
Ivanov, V.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2046833.pdf
Data publikacji:
2006-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
78.55.Et
71.35.-y
Opis:
Photoluminescence of cleaved Cd0.7Mn0.3Te crystals is studied at T≈1.6 K at the normal- and oblique (45º) incidence of the pumping Ar laser beam (λ=488 nm) in magnetic fields -7≤ B≤7 T in the Voigt geometry. At B=0, photoluminescence maximum is found at 2.0819 eV at normal incidence (and backward emission) whereas the oblique incidence and emission shows photoluminescence maximum intensity at 2.0536 eV. The red shift of photoluminescence maximum position with the rise in B is observed and the results are found to be in good agreement with sp-d exchange interaction model for the oblique incidence case. Backward emitted photoluminescence line is found to narrow from 26.2 to 23.5 meV with the rise in B from 0 to 7 T. Alloy disorder contribution exhibits opposite trend to broaden, as is calculated on the basis of the matrix of the energy gap dependence on x and B. Therefore the observed photoluminescence line narrowing is assigned to the suppression of magnetic fluctuation in magnetic field. A linear size of magnetic fluctuation is estimated to be about 1/5 of the free exciton diameter. Photoluminescence maximum position difference in the normal- and oblique incidence cases is assigned to polaritons.
Źródło:
Acta Physica Polonica A; 2006, 109, 6; 731-741
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Edge Energies Pinning in Magnetic Field in Semimagnetic $Cd_{0.7}Mn_{0.3}Te$
Autorzy:
Barauskaitė, L.
Brazis, R.
Ivanov, V.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1492778.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
75.50.Pp
71.70.-d
Opis:
Results of $Cd_{0.7}Mn_{0.3}Te$ magneto-photoluminescence investigations are analyzed. Photoluminescence was measured in a Voigt geometry at the temperature of 1.6 K. Two models describing radiative transition energy are compared with the experimental results of $Cd_{0.7}Mn_{0.3}Te$ luminescence. The energy of recombination transition, employing the complete form of band states splitting description (term due to the Landau splitting included), shows deviation from experiment at B > 2 T. Two possible reasons of discrepancies from the experiment - exchange interaction constants dependence on magnetic field or band edge energies pinning in magnetic field - are discussed. Band edge energies pinning in magnetic field is related to the hybridization of Mn 3 $d^{5}$ levels with the band states of the host. We determine the corrected values of exchange interaction constants $(N_0 α -N_0 β//3)$ at magnetic fields B < 5 T.
Źródło:
Acta Physica Polonica A; 2011, 120, 6; 1056-1060
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM modeling of hard turning with consideration of viscoplastic asymmetry and phase transformation
Autorzy:
Uhlmann, E.
Mahnken, R.
Ivanov, I. M.
Cheng, C.
Powiązania:
https://bibliotekanauki.pl/articles/99847.pdf
Data publikacji:
2013
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
hard turning
finite element method
production technology
process optimization
Opis:
A material model for strain rate and temperature dependent asymmetric plastic behavior accompanied by phase transformation induced plasticity (TRIP) as an important phenomenon in steel production and machining processes was developed. To this end the well-known Johnson-Cook flow stress model has been extended by the concept of weighting functions considering the asymmetric plastic material behavior under tensile, compressive and torsion load. Furthermore, the extended Johnson-Cook model has been combined with the Leblond approach regarding the ductility increase by transformation induced plasticity occurring during hard turning of AISI 52100. On the basis of the theoretical approach for calculating the flow stress with consideration of the viscoplastic asymmetry, a material routine for the FEM-software DEFORM has been implemented. The material and friction model coefficients have been determined in accordance with force and surface temperature measurements during hard turning of AISI 52100. The model takes the phase transformations between martensite and austenite and the influence of externally applied stress on the austenite start temperature into account.
Źródło:
Journal of Machine Engineering; 2013, 13, 1; 80-92
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Electronic States of (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$
Autorzy:
Penc, B.
Zalecki, R.
Jezierski, A.
Szytuła, A.
Kołodziejczyk, A.
Ivanov, V.
Powiązania:
https://bibliotekanauki.pl/articles/2043378.pdf
Data publikacji:
2005-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Gj
71.15.Ap
Opis:
The core-level and valence band electronic states studies of single crystalline transition metal silicides (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$ (x=0 and 0.05) by the X-ray and ultraviolet photoemission spectroscopies are reported. The Mn 2p core-level spectra for both compounds were ascribed to the relevant Mn sites in their crystal structure. The valence band spectra were compared with the result of ab-initio band calculations using the tight-binding linear muffin-tin orbital method. It was concluded that the enhancement of the spectral density within the 2 eV binding energy region below the Fermi energy comes from the effect of strongly correlated Mn 3d electrons.
Źródło:
Acta Physica Polonica A; 2005, 107, 6; 967-976
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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