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Wyświetlanie 1-15 z 44
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:
Analiza mozliwosci wykorzystania roznego typu owijarek do bel podsuszonej zielonki
Analysis of possibilities to use different round bale wrappers to prepare bales with half-dried green fodder
Autorzy:
Gach, S
Korpysz, K.
Ivanov, S.
Skonieczny, I.
Powiązania:
https://bibliotekanauki.pl/articles/884115.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
prasoowijarki
maszyny rolnicze
owijarki z zaladunkiem
wykorzystanie
owijarki
rozwiazania konstrukcyjne
owijarki bez urzadzen zaladunkowych
Opis:
W artykule dokonano podziału owijarek ze względu na, sposób załadunku bel na stół roboczy oraz współpracę z ciągnikiem jako zawieszane i przyczepiane oraz współpracujące bezpośrednio z prasami zwijającymi. Opisano budowę i działanie maszyn.
The paper presents review of round bale wrappers including such aspects as: loading of table with bale, mounted and semimounted version of the machinery as well as the wrappers directly connected with round balers. Constructional and operational aspects of the machines have been described.
Źródło:
Technika Rolnicza Ogrodnicza Leśna; 2008, 04; 8-11
1732-1719
2719-4221
Pojawia się w:
Technika Rolnicza Ogrodnicza Leśna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza parametrow technicznych owijarek do bel podsuszonej zielonki
Analysis of technical parameters of wrappers for bales with green fodder
Autorzy:
Gach, S
Korpysz, K.
Ivanov, S.
Skonieczny, I.
Powiązania:
https://bibliotekanauki.pl/articles/883091.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
maszyny rolnicze
analiza porownawcza
owijarki
parametry techniczne
Opis:
Przeanalizowano ofertę owijarek obejmującą 125 modeli zestawionych w tabeli. Maszyny do owijania bel walcowych stanowią 76% a uniwersalne 19%. Owijarki przeznaczone są do bel walcowych o średnicy od 80 do 180 cm, a prostopadłościennych o wymiarach poprzecznych od 70 do 125 cm i długości do 200 cm. Typowym rozwiązaniem stołu roboczego są rolki walcowe z pasami stanowiące 56% ogólnej liczby rozwiązań. Większość maszyn przystosowanych jest do owijania folią o szerokości 50 lub 75 cm. Najszerszą gamą produktów wyróżnia się firma Göweil, która oferuje 15 różnych typów owijarek.
The analysis of offered wrappers (including 125 models given in table) was presented. The machinery for wrapping of cylindrical bales cover 76% of the offer, while 19 % there are universal solutions. The wrappers are designed for cylindrical bales with 80 - 180 cm diameter and rectangular bales with 70 - 125 cm (lateral sizes) and not longer than 200 cm. The typical solution concerning working table there are cylindrical rolls with belts (about 56 % of the considered solutions). Most of the machines are adapted for wrapping with plastic film width 50 cm or 75 cm. The most number of models is offered by Göweil company; the mentioned company offers 15 different type of wrappers.
Źródło:
Technika Rolnicza Ogrodnicza Leśna; 2008, 05; 20-24
1732-1719
2719-4221
Pojawia się w:
Technika Rolnicza Ogrodnicza Leśna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of forming tread wheel sets
Autorzy:
Ivanov, I.
Evseev, D.
Ovsyanikova, I.
Tarapanov, A.
Powiązania:
https://bibliotekanauki.pl/articles/374379.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
recovery of wheel sets
grinding
fractals
high speed cutting
naprawa zestawów kołowych
mielenie
fraktale
obróbka szybkościowa
Opis:
This paper shows the results of a theoretical study of profile high-speed grinding (PHSG) for forming tread wheel sets during repair instead of turning and mold-milling. Significant disadvantages of these methods are low capacity to adapt to the tool and inhomogeneous structure of the wheel material. This leads to understated treatment regimens and difficulties in recovering wheel sets with thermal and mechanical defects. This study carried out modeling and analysis of emerging cutting forces. Proposed algorithms describe the random occurrence of the components of the cutting forces in the restoration profile of wheel sets with an inhomogeneous structure of the material. To identify the statistical features of randomly generated structures fractal dimension and the method of random additions were used. The multifractal spectrum formed is decomposed into monofractals by wavelet transform. The proposed method allows you to create the preconditions for controlling the parameters of the treatment process.
Źródło:
Transport Problems; 2017, 12, 3; 35-42
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathodoluminescence Profiling of InGaN-Based Quantum Well Structures and Laser Diodes - In-Plane Instabilities of Light Emission
Autorzy:
Godlewski, M.
Ivanov, V. Yu.
Goldys, E. M.
Phillips, M.
Böttcher, T.
Figge, S.
Hommel, D.
Czernecki, R.
Prystawko, P.
Leszczynski, M.
Perlin, P.
Grzegory, I.
Porowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2036870.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
61.72.Mm
68.37.Hk
78.60.Hk
Opis:
Instabilities of light emission and also of stimulated emission in series of GaN epilayers and InGaN quantum well structures, including laser diode structures, are studied. A stimulated emission is observed under electron beam pumping. This enabled us to study light emission properties from laser structures and their relation to microstructure details. We demonstrate large in-plane fluctuations of light emission and that these fluctuations are also present for excitation densities larger than the threshold densities for the stimulated emission.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 689-694
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cd(Mg)Se Single Layers and CdSe/CdMgSe Heterostructures Grown by Molecular Beam Epitaxy on InAs(001) Substrates
Autorzy:
Kaygorodov, V. A.
Sorokin, V. S.
Sedova, I. V.
Nekrutkina, O. V.
Sorokin, S. V.
Shubina, T. V.
Toropov, A. A.
Ivanov, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/2028799.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Hf
Opis:
We report on molecular beam epitaxy of CdSe/CdMgSe heterostructures on InAs(001) substrates and studies of their optical and structural properties. The CdMgSe energy gap versus composition dependence is determined. The zinc-blende MgSe band-gap energy and optical bowing parameter are estimated to be 4.05 eV and 0.2 eV, respectively. The CdSe quantum wells embedded into CdMgSe barriers demonstrate intense photoluminescence. Effective mass approximation calculations of electron-heavy hole optical transitions in CdSe quantum well are in a good agreement with the experimental data obtained.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 443-450
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CdSe Layers of Below Critical Thickness in ZnSe Matrix: Intrinsic Morphology and Defect Formation
Autorzy:
Sedova, I.
Shubina, T.
Sorokin, S.
Sitnikova, A.
Toropov, A.
Ivanov, S.
Willander, M.
Powiązania:
https://bibliotekanauki.pl/articles/1992185.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.45.+h
Opis:
Three main stages of the intrinsic morphology transformation of MBE grown CdSe fractional monolayers in ZnSe with increase in their nominal thickness w in the 0.1-3.0 monolayer range were found using both structural and optical characterization techniques. Emergence of the extended (15-30 nm) CdSe-enriched quantum-dot-like pseudomorphic islands at w>0.7 monolayer with the density increasing up to 2.5×10$\text{}^{10}$ cm$\text{}^{-2}$ at w=2.8 monolayer is clearly displayed in the optical properties of CdSe fractional monolayer nanostructures. The below critical thickness CdSe fractional monolayers having extremely high quantum efficiency can be very perspective as an active region of ZnSe-based blue-green lasers.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 519-525
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CdSe/ZnCdSe Quantum Dot Heterostructures for Yellow Spectral Range Grown on GaAs Substrates by Molecular Beam Epitaxy
Autorzy:
Gronin, S.
Sorokin, S.
Kazanov, D.
Sedova, I.
Klimko, G.
Evropeytsev, E.
Ivanov, S.
Powiązania:
https://bibliotekanauki.pl/articles/1376051.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Hi
78.55.Et
78.67.Hc
68.65.Fg
Opis:
This paper reports on theoretical calculations and fabrication by molecular beam epitaxy of wide-gap II-VI heterostructures emitting in the "true" yellow range (560-600 nm) at room temperature. The active region of the structures comprises CdSe quantum dot active layer embedded into a strained $Zn_{1-x}Cd_{x}Se$ (x=0.2-0.5) quantum well surrounded by a Zn(S,Se)/ZnSe superlattice. Calculations of the CdSe/(Zn,Cd)Se/Zn(S,Se) quantum dot-quantum well luminescence wavelength performed using the envelope-function approximation predict rather narrow range of the total $Zn_{1-x}Cd_{x}Se$ quantum well thicknesses (d ≈ 2-4 nm) reducing efficiently the emission wavelength, while the variation of x (0.2-0.5) has much stronger effect. The calculations are in a reasonable agreement with the experimental data obtained on a series of test heterostructures. The maximum experimentally achieved emission wavelength at 300 K is as high as 600 nm, while the intense room temperature photoluminescence has been observed up to λ =590 nm only. To keep the structure pseudomorphic to GaAs as a whole the tensile-strained surrounding $ZnS_{0.17}Se_{0.83}$/ZnSe superlattice were introduced to compensate the compressive stress induced by the $Zn_{1-x}Cd_{x}Se$ quantum well. The graded-index waveguide laser heterostructure with a CdSe/$Zn_{0.65}Cd_{0.35}Se$/Zn(S,Se) quantum dot-quantum well active region emitting at λ =576 nm (T=300 K) with the 77 to 300 K intensity ratio of 2.5 has been demonstrated.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1096-1099
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined (ZnSe/MgS)/ZnCdSe Bragg Reflectors Grown Using ZnS as a Sulphur Source
Autorzy:
Solnyshkov, D. D.
Sorokin, S. V.
Sedova, I. V.
Toropov, A. A.
Ivanov, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/2044540.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Fy
Opis:
We report on MBE growth and study of optical and structural properties of (ZnSe/MgS)/ZnCdSe distributed Bragg reflectors with λ=520 nm and R$\text{}_{max}$=97%. The samples were grown pseudomorphically on GaAs substrate using ZnS as a sulphur source. Scanning electron microscopy, X-ray diffraction, and optical measurements showed good optical and structural characteristics of the Bragg reflectors.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 873-877
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combustion of Energetic Systems Based on HMX and Aluminum: Infuence of Particle Size and Mixing Technology
Autorzy:
Muravyev, N.
Frolov, Y.
Pivkina, A.
Monogarov, K.
Ivanov, D.
Meerov, D.
Fomenkov, I.
Powiązania:
https://bibliotekanauki.pl/articles/358822.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic systems
burning rate
HMX
aluminium
Opis:
In this work the complex experimental investigation of the microstructure and burning parameters of HMX-monopropellant and 25%Al/75%HMX energetic systems was carried on with the particle size variation. Components, their mixtures, pressed samples, and the combustion products (agglomerates) collected from a burning surface by QPCB (quench particle collection bomb) technique were investigated. Two types of HMX particles: micro-sized (mHMX) and ultrafne (uHMX) and aluminium powders: micro- and ultra-sized (ALEXTM) were used. Morphology and particle size were examined by atomic-force microscopy (AFM), scanning electron microscopy (SEM) and BET-analysis. AFM analysis shows the ALEXTM average volume particle size is 180 nm. It was shown, that the monopropellant's burning rates of the micro- and ultra-sized HMX are almost identical in the pressure range 20-100 atm. Two mixing technologies to prepare Al/HMX compositions were used: (i) conventional "dry" mixing and (ii) "wet" technique with ultrasonic processing in diethyl ether. Applying of ultrasonic technique results in a burning rate increase up to 18% comparing to "dry" mixing (under pressure 60 atm). The highest combustion rate was determined for composition of mHMX/ALEXTM (porosity 13%). Infuence of component N. Muravyev et al. size and composition's microstructure on the burning rate of energetic systems is discussed and analyzed.
Źródło:
Central European Journal of Energetic Materials; 2009, 6, 2; 195-210
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage and modification of materials produced by pulsed ion and plasma streams in Dense Plasma Focus device
Autorzy:
Pimenov, V. N.
Demina, E. V.
Ivanov, L. I.
Gribkov, V. A.
Dubrovsky, A. V.
Ugaste, U.
Laas, T.
Scholz, M.
Miklaszewski, R.
Kolman, B.
Tartari, A.
Powiązania:
https://bibliotekanauki.pl/articles/147722.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma focus
pulse irradiation
surface damage
Opis:
The Dense Plasma Focus (DPF) devices PF-1000, PF-6 and PF-5M working with different gases and in dissimilar irradiation modes were used to carry out experimental investigations of irradiation of a number of materials by powerful pulsed ion and high-temperature plasma streams. The materials under test were designed for application in structural and functional components of thermonuclear fusion devices with magnetic (MPC) and inertial (IPC) plasma confinement, as well as for working chambers of plasma and accelerator devices. The main features of the materials are low-activation and radiation-resistant properties. On the basis of the investigations a significant progress was achieved in understanding of dynamics of high-energy nano- and micro-second pulsed streams in DPF from one side as well as on the mechanisms of their influence upon materials under irradiation from the other one. We demonstrated that this approach can be useful for certain tests of plasma-facing materials (e.g. W for MPC and stainless steels for IPC) and of structural (construction) elements of the above-mentioned devices subjected to pulsed high-energy radiation streams. The results obtained suggest also that DPF devices can be used in new pulse technologies for material treatment by means of powerful nanosecond and microsecond pulses of plasma and ion streams.
Źródło:
Nukleonika; 2008, 53, 3; 111-121
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diamond side resonances: influence of isotopic substitution of carbon
Autorzy:
Ivanov, A. A.
Ivanov, A. I.
Powiązania:
https://bibliotekanauki.pl/articles/1940702.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska
Tematy:
diamond
hyperfine structure
side resonances
Opis:
We discuss the side resonances of the optically detected magnetic resonance in a diamond crystal and propose a new approach to the calculation of the hyperfine interaction in a composed system consisting of a negatively charged nitrogen-vacancy NV- center and a nearby 13C nuclear spin. The energy levels, rule selection and radiative transitions are obtained by a new method. The base of this method is the use of a complete set of commuting operators and entangled spin states. An estimation of the carbon hyperfine splitting parameters in the diamond NV- center from side-resonance frequencies is obtained in the frame of this method.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 2; 173-176
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of pressure liquid extraction and ultrasonic irradiation frequency on inulin, phenolic content and antioxidant activity in burdock (Arctium lappa L.) roots
Autorzy:
Petkova, N.
Ivanov, I.
Mihaylova, D.
Lante, A.
Powiązania:
https://bibliotekanauki.pl/articles/12719126.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Burdock (Arctium lappa L.) roots are traditionally used in folk medicine as diuretic and curing rheumatism, gastritis, gout, throat pain, arthritis and rashes. These pharmacological properties are due to many bioactive compounds such as flavonoids and fructooligosaccharides. Nowadays, the the application of “green” methods for extraction of natural compounds gains more and more attention. The object of the current research was to determine inulin and sugars content, phenolic content and antioxidant potential in 70% ethanol and water extracts obtained by two “green“ extraction methods, namely pressure-liquid extraction and ultrasound-assisted techniques. The content of total fructans, as well as inulin and sugars were analyzed by spectrophotometric resorcinol-thiourea method and high-performance liquid chromatography with refractive index detection. Total phenols and flavonoids were determined by Folin-Chiocalteu and Al(NO₃)₃ reagents. Antioxidant activity was evaluated by four reliable methods (DPPH, ABTS, FRAP and CUPRAC). The established inulin content varied from 0.27 to 4.0 g/100 g dw in prevalence of the ultrasound-assisted extract obtained with water. Additionally, the established phenolic compounds content (from 10.35 to 18.16 mg gallic acid equivalent (GAE)/g dw) and antioxidant activities demonstrated the burdock roots as potential source phytonutrients with health beneficial properties.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 3; 125-133
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective Green Semiconductor Lasers with Multiple CdSe/ZnSe QD Active Region for Electron Beam Pumping
Autorzy:
Gronin, S.
Sorokin, S.
Sedova, I.
Kop'ev, P.
Ivanov, S.
Zverev, M.
Gamov, N.
Peregoudov, D.
Studionov, V.
Powiązania:
https://bibliotekanauki.pl/articles/1811929.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.67.Hc
Opis:
The characteristics of ZnSe-based electron beam pumped semiconductor lasers are presented in detail. The laser structures consist of a 0.6 μm thick superlattice waveguide centered with ten equidistantly placed CdSe/ZnSe quantum dot active layers. The maximum light output pulse power of 12 W per facet at room temperature along with an extremely high quantum efficiency of ≈8.5% were obtained at an electron beam pumping energy of 23 keV (the laser wavelength is of 542 nm). The calculations of a spatial distribution of non-equilibrium carrier concentration within the semiconductor structures under electron beam pumping are presented. The possible ways of further improvement of laser efficiency are discussed.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1115-1122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electric Polarization of Onsager Fluids. I. Dipole Polarization. 3. The Role of Universal Pairwise Interactions
Autorzy:
Prezhdo, V. V.
Tarasova, G. V.
Prezhdo, O. V.
Τyurin, S. A.
Ivanov, N. I.
Kurskaya, T. N.
Powiązania:
https://bibliotekanauki.pl/articles/1933603.pdf
Data publikacji:
1995-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
35.20.My
31.70.Dk
Opis:
A comparative study of the methods of interpretation of solvent influences on electric properties of molecules was conducted based on experimental dielectric properties of dilute solutions of organic substances of various polarity. It was shown that the solvent effect estimated via London-Debye-Keesom pairwise interaction potentials is best accounted for by theories of polarization of condense media which develop the anzatzes of reactive field and local dielectric permittivity.
Źródło:
Acta Physica Polonica A; 1995, 88, 3; 419-434
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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