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Wyświetlanie 1-15 z 44
Tytuł:
Analysing experimental research data with the help of numerical derivative
Autorzy:
Książkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/97475.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
numerical methods
derivative
electrical contacts
Opis:
A lot of research data is generated during carrying out experiments like for example in case of oscilloscope records. In this huge amount of information a lot of it is irrelevant. Therefore finding the useful information can be difficult. The influence of closing a short- circuit current with an electromagnetic relay on its contacts was tested. During those tests a large amount of data, recorded by oscilloscope, was created. Only a small portion of this information was useful. The problem was to find specific information in all of the gathered data. This article presents the usage of scientific software designed to solve this issue. It also describes the usage of numerical derivate for finding a specific time range of collected waveforms.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 304-309
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przestrzeń w badaniach archeologicznych – metody czytania i interpretacji
SPACE IN ARCHAEOLOGICAL RESEARCH – METHODS OF READING AND INTERPRETATION. AN OUTLINE OF THE ISSUE
Autorzy:
Połtowicz-Bobak, Marta
Powiązania:
https://bibliotekanauki.pl/articles/498037.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
SPACE
PALAEOLITHIC
SITE
REGIONAL CONTACTS
Opis:
This paper explores the issue of spatial research at Palaeolithic sites, discussing spatial analyses and their significance both at individual sites and at a regional scale. Interpretations of immovable and movable objects, the role of refitting analyses, and at a regional scale the importance of raw materials analyses are all addressed.
Źródło:
Analecta Archaeologica Ressoviensia; 2011, 6; 237-270
2084-4409
Pojawia się w:
Analecta Archaeologica Ressoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Cr ohmic contact on graphitized 6H-SiC(0001) surface
Autorzy:
Grodzicki, M
Mazur, P
Wasielewski, R
Ciszewski, A
Powiązania:
https://bibliotekanauki.pl/articles/173424.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
silicon carbide
chromium
electric contacts
graphitization
Opis:
Ohmic electrical contacts were formed at room temperature on n-type, Si-oriented 6H-SiC substrates, with Cr layers vapor-deposited under ultra-high vacuum conditions on the samples being graphitized prior to the deposition. The contacts reveal a very good linearity of the local I–V characteristics. This method of ohmic contact formation does not require the use of samples with high doping concentration and the application of high-temperature annealing during the processing of contacts. Results of characterization of the contacts and of the in situ graphitization process of the SiC substrates, obtained by X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED) and atomic force microscopy (AFM) with conducting tip, are given in this paper.
Źródło:
Optica Applicata; 2013, 43, 1; 91-98
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of p-type contacts to InGaN-based laser diodes and light emitting diodes grown by plasma assisted molecular beam epitaxy
Autorzy:
Nowakowski-Szkudlarek, Krzesimir
Muziol, Grzegorz
Żak, Mikolaj
Hajdel, Mateusz
Siekacz, Marcin
Feduniewicz-Żmuda, Anna
Skierbiszewski, Czesław
Powiązania:
https://bibliotekanauki.pl/articles/173471.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
gallium nitride
molecular beam epitaxy
contacts
Opis:
We investigated the influence of the In0.17Ga0.83N:Mg contact layer grown by plasma assisted molecular beam epitaxy on the resistivity of p-type Ni/Au contacts. We demonstrate that the Schottky barrier width for p-type contact is less than 5 nm. We compare circular transmission line measurements with a p-n diode current-voltage characteristics and show that discrepancies between these two methods can occur if surface quality is deteriorated. It is found that the most efficient contacts to p-type material consist of In0.17Ga0.83N:Mg contact layer with Mg doping levelas high as 2 × 1020 cm–3.
Źródło:
Optica Applicata; 2020, 50, 2; 323-330
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Privacy and security of contact data on mobile phones with Windows Phone Operating System
Autorzy:
Pawłowicz, B.
Strzałka, A.
Tybura, M.
Powiązania:
https://bibliotekanauki.pl/articles/114444.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Windows
Windows Phone
contacts
data privacy
Opis:
In this paper we present analysis of how contact data is managed by Windows on mobile phones and our approach in making it more private. Aim of this work was to design and develop application that can store contacts locally in memory of device with installed Windows Phone 8.1 operating system. That application can be used to create, edit, and remove contacts without usage of Microsoft cloud services. Developed application also allows to send text messages, e-mails, and call to saved telephone number.
Źródło:
Measurement Automation Monitoring; 2017, 63, 1; 24-27
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ohmic contacts for room-temperature AlGaAs/GaAs quantum cascade lasers (QCL)
Autorzy:
Baranska, A
Szerling, A
Karbownik, P
Hejduk, K
Bugajski, M
Laszcz, A
Golaszewska-Malec, K
Filipowski, W
Powiązania:
https://bibliotekanauki.pl/articles/949413.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ohmic contacts
n-GaAs
CTLM
EDXS
TEM
Opis:
This paper reports on the results of optimization of the ohmic contacts for GaAs/AlGaAs quantum cascade lasers (QCLs). Technological parameters during the optimization procedure concerned time and temperature of thermal processing as also the ratio of metallic layers thickness. The main goal of this work was to obtain stable ohmic contacts with low resistance and a smooth surface. Circular transmission line method (CTLM) was applied for the electrical characterization of the Ni/AuGe/Ni/Au and AuGe/Ni/Au metallization systems. Transmission electron microscopy (TEM) method was used for the characterization of microstructures. Elements concentration in layers was determined by the energy dispersive X-ray spectroscopy (EDXS). The best results for the specific contacts resistivity, thermal stability and morphology were obtained when the Ni/AuGe/Ni/Au and the AuGe/Ni/Au systems were processed at 440 °C and 400 °C, respectively.
Źródło:
Optica Applicata; 2013, 43, 1; 5-15
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo method used for a prognosis of selected technological parameters
Autorzy:
Langer, M.
Powiązania:
https://bibliotekanauki.pl/articles/308641.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
DFSS
MC method
PVD
contacts
Excel randomizing
Opis:
In this paper a smart modeling approach for realistic simulation of selected technological parameters is presented. The technology of making contacts with plasma vapor deposition (PVD) method has been chosen for this purpose. The analysis is based on the Monte Carlo (MC) method and uses the Excel worksheet - the simplest tool, easily accessible to anyone. The statistic parameters are calculated and discussed as we introduce this experiment to demonstrate the advantages of design for six sigma (DFSS)
Źródło:
Journal of Telecommunications and Information Technology; 2007, 3; 96-100
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Al contacts to Si surface exposed in the course of plasma etching of previously grown nanocrystalline c-BN film
Autorzy:
Firek, P.
Werbowy, A.
Szmidt, J.
Olszyna, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/308834.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cubic boron nitride
plasma etching
electric contacts
Opis:
Properties of Al electric contacts to Si(p) surface exposed to fluorine-based plasma etching of nanocrystalline cubic boron nitride (c-BN) film grown previously were studied and compared to the properties of Al contacts fabricated on pristine or dry etched surface of Si(p) wafers. In addition, a part of the investigated samples was annealed in nitrogen atmosphere at the temperature of 673 K. Analysis of contract properties is based on current-voltage (I-V) measurements of the produced Al-Si structures. The presented investigations were performed in order to evaluate the efficiency of the applied plasma etching method of nanocrystalline c-BN from the viewpoint of its influence on the properties of metal contacts formed subsequently and thus on the performance of electronic devices involving the use of boron nitride.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 76-80
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vacuum switches contact resistance
Autorzy:
Janiszewski, J.
Książkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/97451.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
contacts
contact resistance
contact materials
vacuum switches
Opis:
Contact resistance of coupled electrodes, in particular the ones used in high current switches, is a fundamental parameter in determining their rated current (continuous operation) and limit theirs short-circuit current (above which contacts are welded). The paper presents the simulation results of the transition resistance of selected types of contacts calculated with different mathematical models, and assess the extent of their compliance with the results of real objects.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 227-236
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
References or loans on Polish-East Slavic borderlands? Part III
Nawiązania czy pożyczki na pograniczu polsko-wschodniosłowiańskim? Cz. III
Autorzy:
Rembiszewska, Dorota Krystyna
Siatkowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2084747.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Slavic language contacts
dialectal geography
Slavic dialectology
Opis:
The text discusses words occurring in the Polish-East Slavic borderlands and prevalent in eastern Polish dialects. Differntiation between old references and loans in this area is not always easy. The material presented here is very diverse. In the case of certain words, identifying them as East Slavic loans with an indisputable source is possible, while in the case of others it is diffi cult to identify the direct source of the loan. Among the words recorded in the East Slavic borderlands we can fi nd those whose range in Polish dialects seems to indicate the possibility of Ruthenian infl uence; however, their Polish phonetic form implies their native origin and one should speak about an old reference in this respect. We also encounter Pan-Slavic words, where a doubt arises as to whether they are loans or old references in Polish in the East Slavic area and Eastern Poland.
Źródło:
Rocznik Slawistyczny; 2019, 68; 49-101
0080-3588
Pojawia się w:
Rocznik Slawistyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of heat distribution in low voltage electrical contacts
Autorzy:
Książkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/377805.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electrical contacts
heat
temperature
simulation
contact material
resistance
Opis:
Electrical contacts are essential part of many electrical appliances, among which are circuit breakers or electromagnetic relays. For their long term usage heat distribution, during normal operation, is a key factor. Heat generated is relative to both the current value and electrical contact resistance. A numerical simulation, using specialized scientific program, is used to observe heat distribution in electrical contacts. This simulation is generated based on real electrical contacts data used in electromagnetic relays.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 86; 201-211
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and Electrical Properties of Silver-Matrix Composites Reinforced with Various Forms of Refractory Phases
Autorzy:
Borkowski, P.
Pietrzak, K.
Frydman, K.
Wójcik-Grzybek, D.
Gładki, A.
Sienicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/351236.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite materials
electrical contacts
arc erosion
contact resistance
Opis:
This paper presents technological trials aimed at producing Ag-W, Ag-WC, Ag-W-C and Ag-WC-C composite contact materials and characterizing their properties. These materials were obtained using two methods, i.e. press-sinter-repress (PSR) at the refractory phase content of less than 30% by weight as well as press-sinter-infiltration (PSI) at the refractory phase content of ≥50% by weight). The results of research into both the physical and electrical properties of the outcome composites were shown. They include the analysis of the influence of the refractory phase content (W or WC) on arc erosion and contact resistance changes for the following current range: 6 kAmax in the case of composites with a low refractory phase content, 10 kAmax in the case of composites with the refractory phase content of ≥50% by weight.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 817-823
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sephardim, Ashkenazim and Non-Jewish Peoples: Encounters Across Europe
Aszkenazyjczycy, Sefardyjczycy i narody nieżydowskie. Spotkania w Europie
Autorzy:
Twardowska, Aleksandra
Taczyńska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/31339642.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:
Aszkenazyjczycy
Sefardyjczycy
diaspora
kontakty
Europa
Ashkenazim
Sephardim
contacts
Europe
Opis:
The 9th issue of Colloquia Humanistica focuses in its entirety on Jewish/non-Jewish contacts. The papers, presentations of materials, discussions and reviews all share the theme of the entangled history of cohabitation. Still, deconstructed on multiple layers of geography, ethnicity, research domain and methodology, the title’s “encounters” make for varied reading.
Dziewiąty numer Colloquia Humanistica jest w całości poświęcony żydowsko-nieżydowskim kontaktom. Artykuły, prezentacje materiałów, dyskusje i recenzje ilustrują tę uwikłaną historię koegzystencji. Numer jest zróżnicowany, a tytułowe spotkania mają odzwierciedlenie na kilku poziomach: wspomnianych kontaktów żydowsko-nieżydowskich, aszkenazyjsko-sefardyjskich, obszarów badawczych i na poziomie metodologicznym.
Źródło:
Colloquia Humanistica; 2020, 9; 6-12
2081-6774
2392-2419
Pojawia się w:
Colloquia Humanistica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of selected parameters on the electrical strength of a high-voltage vacuum insulation system
Autorzy:
Lech, Michał
Węgierek, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/27309926.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
electrical breakdown
electrical contacts
electrical strength
switchgear
vacuum insulation
Opis:
The article presents the results of laboratory measurements of breakdown voltages in a high-voltage vacuum insulating system for different pressures, contact gaps, type of electrode contacts and type of residual gas inside the discharge chamber. First of all, the electrical strength of the discharge chamber with a contact system terminated with contact pads made of W70Cu30 and Cu75Cr25 material was compared for selected values of contact gaps. It was found that below a pressure of = 3.0×10−1 Pa the electrical strength reaches an approximately constant value for each of the set contact gaps . Analytical relationships were determined to calculate this value for each of the contact pads used. Above a pressure of = 3.0 × 10−1 Pa, the measured values of breakdown voltages decrease sharply. The values of breakdown voltages in the discharge chamber with residual gases in the form of air, argon, neon and helium were also determined for selected values of contact gaps . Depending on the residual gases used, significant differences were noted in the values of pressure at which the loss of insulating properties in the discharge chamber occurred. These values were 3.3 × 10−1 Pa for argon, 4.1 × 10−1 Pa for air, 6.4 × 10−1 Pa for neon, and 2.55 × 100 Pa for helium, respectively.
Źródło:
Archives of Electrical Engineering; 2023, 72, 3; 597--611
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Higher Schools vs. Cities Social Capital in the Light of Theory of Contacts Świetokrzyskie Voivodeship Case
Autorzy:
Mularczyk, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/2035477.pdf
Data publikacji:
2011-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
theory of contacts
social capital
rectors
state and higher schools
Opis:
Systemic transformation process in Poland has led to a dynamic development of higher schools. Those higher schools generate new, both formal and informal, connections triggered by people working there, especially by those at higher positions. This situation leads to the creation of relation networks. Thanks to them one can get, process and transfer information, enlarge the owned knowledge which is necessary to raise the productivity of own activities. In compliance with the theory of contacts it should lead to social capital growth which stimulates development of the analysed areas. The objective of this paper is to characterise and compare contacts of rectors and deputy rectors of state and private higher schools in Świętokrzyskie Voivodeship as well as to evaluate on this basis the part of social capital which develops thanks to formal contacts kept by the researched with people who are at a similar position in other institutions.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2011, 15; 187-200
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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