Autor: Jakubowski, L. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Studies of Plasma-Focus discharges within the PF-360 facility equipped with a planar D2O-ice target
Autorzy:: Zebrowski, J.
Baranowski, J.
Jakubowski, L.
Sadowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/147057.pdf
Data publikacji:: 2001
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: cryogenic target
ion beams
neutron yield
plasma focus
X-rays
Opis:: The paper reports on investigations of dense magnetized plasmas produced within a modernized PF-360 facility, which was operated with an additional planar cryogenic target placed in the front of the electrode outlet and covered with D2O-ice layers. The main aim of these studies was to overcome the neutron saturation effect and to increase the maximum neutron yield from PF discharges by using fast deuteron beams. Such beams are usually emitted from a pinch region and can produce fast neutrons from D-D reactions during their interactions with the additional target.
Źródło:: Nukleonika; 2001, 46, suppl. 1; 65-68
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Studies of Plasma-Focus discharges within the PF-360 facility equipped with needle D2O-ice target
Autorzy:: Baranowski, J.
Jakubowski, L.
Sadowski, M.
Zebrowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/147583.pdf
Data publikacji:: 2001
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: cryogenic target
current sheath
neutrons yield
plasma focus
X-ray
Opis:: The paper describes a new technique which has been investigated in order to overcome the neutron saturation effect and to increase the neutron yield from the plasma-focus (PF) discharges [1]. The PF-360 experimental facility was constructed at the Andrzej Soltan Institute for Nuclear Studies (IPJ) in Swierk, Poland in the late 70s [4, 5]. Recently in order to improve the neutron yield from the PF-360 machine, it was proposed to use a cryogenic deuterium target, which might be placed within the plasma-focus region. For this purpose, we have been made a needle-like cryogenic target covered with a thin „heavy-ice“ layer. A considerable increase in the average neutron yield (from 1.7×1010 to about 2.2×1010 neutrons/shot) has been achieved for 122 kJ PF discharges when the needle target top was placed at a distance of about 100 mm from the electrode ends.
Źródło:: Nukleonika; 2001, 46, suppl. 1; 69-71
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Sun transits in geo satellite systems in the aspect of radio waves propagation
Zjawisko influencji słonecznych w satelitarnych systemach geo w aspekcie propagacji fal radiowych
Autorzy:: Wilk-Jakubowski, J. Ł.
Powiązania:: https://bibliotekanauki.pl/articles/407799.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:: wave propagation
technical parameter
thermal noise
sun fade
solar outage
solar interference
propagacja fal
parametr techniczny
szum cieplny
zanik słoneczny
blokada słoneczna
interferencja słoneczna
Opis:: The article includes description of process of Sun transits, including indispensable information on the parameters employed to show their impact on these phenomena. On this basis the date, the start time and the end time and the duration time of Sun transits could be presented for a given location. The main considerations are pertinent to propagation studies. The part of results connected with Sun transits for the limited frequencies of Ku band (downlink) in satellite systems, depending on the antennae, is presented in this article.
Artykuł zawiera opis zjawiska influencji słonecznych, ukazując niezbędne informacje na temat zastosowanych parametrów, aby przedstawić ich wpływ na te zdarzenia. Na tej podstawie data, czasy początku i końca oraz czas trwania influencji słonecznych mogą zostać określone dla danej lokalizacji. Rozważania dotyczą badań propagacyjnych. W artykule dla łącza downlink zamieszczono część wyników, w zależności od zastosowanych anten, dla granicznych częstotliwości pasma Ku powszechnie wykorzystywanego w łączności satelitarnej.
Źródło:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 4; 56-59
2083-0157
2391-6761
Pojawia się w:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Measurements of fast electron beams and soft X-ray emission from plasma-focus experiments
Autorzy:: Surała, W.
Sadowski, M. J.
Kwiatkowski, R.
Jakubowski, L.
Żebrowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/147850.pdf
Data publikacji:: 2016
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: electron beams
X-ray emission
plasma focus
hot spots
Opis:: The paper reports results of the recent experimental studies of pulsed electron beams and soft X-rays in plasma-focus (PF) experiments carried out within a modifi ed PF-360U facility at the NCBJ, Poland. Particular attention was focused on time-resolved measurements of the fast electron beams by means of two different magnetic analyzers, which could record electrons of energy ranging from about 41 keV to about 715 keV in several (6 or 8) measuring channels. For discharges performed with the pure deuterium fi lling, many strong electron signals were recorded in all the measuring channels. Those signals were well correlated with the fi rst hard X-ray pulse detected by an external scintillation neutron-counter. In some of the analyzer channels, electron spikes (lasting about dozens of nanoseconds) and appearing in different instants after the current peculiarity (so-called current dip) were also recorded. For several discharges, fast ion beams, which were emitted along the z-axis and recorded with nuclear track detectors, were also investigated. Those measurements confi rmed a multibeam character of the ion emission. The time-integrated soft X-ray images, which were taken side-on by means of a pinhole camera and sensitive X-ray fi lms, showed the appearance of some fi lamentary structures and so-called hot spots. The application of small amounts of admixtures of different heavy noble gases, i.e. of argon (4.8% volumetric), krypton (1.6% volumetric), or xenon (0.8% volumetric), decreased intensity of the recorded electron beams, but increased intensity of the soft X-ray emission and showed more distinct and numerous hot spots. The recorded electron spikes have been explained as signals produced by quasi-mono-energetic microbeams emitted from tiny sources (probably plasma diodes), which can be formed near the observed hot spots.
Źródło:: Nukleonika; 2016, 61, 2; 161-167
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Estimation of ISTTOK runaway - electrons energies by means of a Cherenkov - type probe with modified AlN radiators
Autorzy:: Jakubowski, L.
Plyusnin, V. V.
Sadowski, M. J.
Zebrowski, J.
Malinowski, K.
Rabiński, M.
Fernandes, H.
Silva, C.
Duarte, P.
Jakubowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/147516.pdf
Data publikacji:: 2012
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: ISTTOK
runaway electrons
Cherenkov detector
AlN radiators
Opis:: Measurements of fast electrons, as performed during recent few years in small tokamaks, demonstrated that detectors based on the Cherenkov effect are very useful tools for such studies. The modernized measuring heads, which were equipped with miniature aluminum-nitride (AlN) radiators, enabled to determine locations and instants of the fast electrons emission and to estimate their energy. A comparison of four measuring channels showed that in ISTTOK the most important role was played by electrons of energy less than 90 keV.
Źródło:: Nukleonika; 2012, 57, 2; 177-181
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: History of Semiconductors
Autorzy:: Łukasiak, L.
Jakubowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/308134.pdf
Data publikacji:: 2010
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: band theory
laser
Moore's law
semiconductors
transistor
Opis:: The history of semiconductors is presented beginning with the first documented observation of a semiconductor effect (Faraday), through the development of the first devices (point-contact rectifiers and transistors, early field-effect transistors) and the theory of semiconductors up to the contemporary devices (SOI and multigate devices).
Źródło:: Journal of Telecommunications and Information Technology; 2010, 1; 3-9
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Modeling of the inverse base width modulation effect in HBT transistor with graded SiGe base
Autorzy:: Zaręba, A.
Łukasiak, L.
Jakubowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/308625.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: heterojunction bipolar transistor
SiGe
base width modulation
Opis:: A model of the position of the edge of emitter-base junction in the base and collector current pre-exponential ideality factor in HBT transistor with a SiGe base is presented. The model is valid for transistors with nonuniform profiles of doping and Ge content. The importance of taking into account the dependence of the effective density of states in SiGe on local Ge content and that of electron diffusion coefficient in SiGe on drift field for modeling accuracy is studied.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 3; 88-92
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A methodology of wind turbines selection for the given wind conditions
Autorzy:: Jakubowski, M.
Mech, Ł.
Wolniewicz, K.
Powiązania:: https://bibliotekanauki.pl/articles/95331.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: wind power
wind conditions
wind turbine
energia wiatru
warunki wiatrowe
turbina wiatrowa
Opis:: The following paper presents a methodology of wind turbines selection with a axis of rotation based on measurements of wind conditions specific for the wind power sector. Basic properties and characteristics used in the wind power sector, as well as a proper measurement campaign along with determining the necessary instrumentation and the methodology of its use, are the basic parameters that determine the decision of wind farm investment. The main goal of those activities is to gather the accurate meteorological data in sufficient amount using a measurement tower situated at a possible future location of a wind farm. This method is used to identify the direction, speed, gust and energy of the wind. Measurements were made in northern Poland using a measurement system based on a 80-meter-high telescopic mast. The system was equipped with instrumentation necessary to measure and record the basic wind parameters, and was made by the Windhunter Serwis Ltd. Company headquartered in Koszalin. The reliability of measurements was verified using the statistical methods based on the Weitbull’s distribution and the windrose. Thus, the energy potential of the raw air stream was determined with a possible future use in a wind farm sitting.
Źródło:: Journal of Mechanical and Energy Engineering; 2017, 1, 2; 171-178
2544-0780
2544-1671
Pojawia się w:: Journal of Mechanical and Energy Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Numerical modelling of sound transmission through the window type partition
Autorzy:: Kwapisz, L.
Maurin, A.
Jakubowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/127902.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: sound transmission
acoustic insulation
window
numerical simulation
transmisja dźwięku
izolacja akustyczna
okno
symulacja numeryczna
Opis:: The approach to numerical modelling of sound transmission through window type partitions is investigated in the paper. The laboratory conditions of reverberation room are simulated. The numerical and experimental results are compared. The impact of different model parameters on the sound insulation levels are evaluated.
Źródło:: Vibrations in Physical Systems; 2016, 27; 211-218
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Modeling SiGe-base HBT using APSYS 2000 - a 2D simulator
Autorzy:: Linkowski, A.
Łukasiak, L.
Jakubowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/308023.pdf
Data publikacji:: 2004
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: base transit time
cut-off frequency
HBT
SiGe-base
Opis:: The paper is devoted to optimization of SiGe-base HBT with respect to operation speed by means of numerical simulation. The influence of design parameters on f(T) is studied.
Źródło:: Journal of Telecommunications and Information Technology; 2004, 1; 36-38
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Silicon microelectronics: where we have come from and where we are heading
Autorzy:: Łukasiak, L.
Jakubowski, A.
Pióro, Z.
Powiązania:: https://bibliotekanauki.pl/articles/308029.pdf
Data publikacji:: 2004
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: MOSFET
scaling
SiGe
SOI
Opis:: The paper briefly presents the history of microelectronics and the limitations of its further progress, as well as possible solutions. The discussion includes the consequences of the reduction of gate-stack capacitance and difficulties associated with supply-voltage scaling, minimization of parasitic resistance, increased channel doping and small size. Novel device architectures (e.g. SON, double-gate transistor) and the advantages of silicon-germanium are considered, too.
Źródło:: Journal of Telecommunications and Information Technology; 2004, 1; 7-14
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Influence of cathodic-protection-induced hydrogenation on mechanical properties of two ship hull plate steels
Autorzy:: Jakubowski, M.
Modelski, Ł.
Podbereski, M.
Powiązania:: https://bibliotekanauki.pl/articles/258556.pdf
Data publikacji:: 2008
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: ship steels
hydrogenation
Charpy-V impact test
tensile testing
Opis:: Tensile testing and Charpy V impact testing results for two ship hull steels: an ordinary strength steel grade A and a higher strength steel grade AH32 each in both as-received conditions and in hydrogenated by zinc protector in salt water conditions. For both steels the hydrogenation has slightly increased yield stress (Re) and elongation (A) and has not influenced ultimate tensile strength (Rm), while reduction of area has been unchanged (A steel) or even decreased (AH32 steel) due to the hydrogenation. The effect of the hydrogenation on Charpy tests results has evidently been beneficial: the increase of Charpy energy and of percent fibrosity (ductility) of fracture appearance as well as a shift down of ductile-brittle transition temperatures have been observed. It seems that the present practice to evaluate the mechanical properties of ship steels by testing the specimens without hydrogenation leads to conservative results. The Authors have hypothesized that the beneficial effect of hydrogenation can occur if the deformation rate is fast enough, the notch is sharp enough (although only for specimens hydrogenated in unstressed conditions) and hydrogen concentration is moderate.
Źródło:: Polish Maritime Research; 2008, 1; 65-71
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Comparison of 4H-SiC and 6H-SiC MOSFET I-V characteristics simulated with Silvaco Atlas and Crosslight Apsys
Autorzy:: Stęszewski, J.
Jakubowski, A.
Korwin-Pawlowski, M. L.
Powiązania:: https://bibliotekanauki.pl/articles/308627.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: silicon carbide
SiC MOSFET
4H-SiC
6H-SiC
Crosslight Apsys
Silvaco Atlas
Opis:: A set of physical models describing silicon carbide with fitting parameters is proposed. The theoretical I-V output and transfer characteristics and parameters of MOS transistors were calculated using Silvaco Atlas and Crosslight Apsys semiconductor device simulation environments.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 3; 93-95
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Arbitrary waveform generator for charge-pumping
Autorzy:: Iwanowicz, M.
Pióro, Z.
Łukasiak, L.
Jakubowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/308629.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: arbitrary waveform generator,
calibration
charge-pumping
digital synthesis
noise
Opis:: The paper presents a new signal generator for charge-pumping. Modular structure of the generator is discussed with special emphasis on signal-generation module consisting of five independent signal channels. Digital signal synthesis is chosen to minimize inaccuracies. Noise analysis is performed to demonstrate the validity of the design of signal channel. Calibration procedure is also discussed.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 3; 78-83
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: An impact of frequency on capacitances of partially-depleted SOI MOSFETs
Autorzy:: Tomaszewski, D.
Łukasik, L.
Zaręba, A.
Jakubowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/309325.pdf
Data publikacji:: 2000
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: SOI MOSFET
small-signal models
non-quasi-static analysis
admittances
Opis:: A non-quasi-static model of partially-depleted SOI MOSFETs is presented. Phenomena, which are particularly responsible for dependence of device admittances on frequency are briefly described. Several C-V characteristics of the SOI MOSFET calculated for a wide range of frequencies, preliminary results of numerical analysis and of measurements and brief analysis of the results are presented. Methods of model improvement are proposed.
Źródło:: Journal of Telecommunications and Information Technology; 2000, 3-4; 67-71
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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