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Tytuł:
Pure bending of strip (beam) with crack in strip of tensile stress with allowance for plastic strips near crack tips
Autorzy:
Sulym, Heorgij
Opanasovych, Viktor
Slobodian, Mykola
Bilash, Oksana
Powiązania:
https://bibliotekanauki.pl/articles/387360.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
pure bending
strip
beam
crack
plastic strip
linear conjugation problems
Opis:
In the article, the pure bending problem for strip (beam) with straight, perpendicular to its axis crack located in the zone of tensile stresses is investigated on the assumption of narrow plastic strips near crack tips. Using methods of the theory of functions of a complex variable and complex potentials, the problem is reduced to the several linear conjunction problems. The solutions of latter problems are ob-tained in the class of functions confined in the edges of plastic strips. Formulas for the calculation of their lengths are derived. Expressions for the determination of crack tip opening values are written. Numerical analysis of the problem is performed.
Źródło:
Acta Mechanica et Automatica; 2020, 14, 1; 44-49
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polityka Izraela wobec Strefy Gazy po 2005 r.
Israel`s policy towards the Gaza Strip after 2005
Autorzy:
Guzowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/505861.pdf
Data publikacji:
2014
Wydawca:
Krakowska Akademia im. Andrzeja Frycza Modrzewskiego
Tematy:
Gaza Strip
Hamas, Israel
Palestine
Opis:
The 2005 Israeli disengagement from the Gaza Strip dramatically changed the political situation of said territory. Due to the poor economic situation of its inhabitants, itself caused by years of Israeli policy of isolation, and general perception of being mistreated by the Israeli government, the power vacuum created in the wake of the withdrawal was filled by Hamas. The fundamentalists took control of the Gaza Strip in 2007, which caused the decision-makers in Tel Aviv to take radical measures to deal with the organization. A tight blockade of the Gaza Strip was introduced and while it may have curbed some of Hamas activities, it also worsened the living conditions of the inhabitants, creating a humanitarian crisis. Israeli policy has been criticized by many members of the international community. Moreover, Tel Aviv carried out several military operations, two of which (“Cast Lead” in 2008/2009 and “Protective Edge” in 2014) were characterized by significantly high numbers of civilian deaths. All of these actions, aimed at eliminating terrorists and improving Israeli citizens' security, seem to be rather short-sighted. Israeli policy only popularizes Hamas propaganda among Palestinians, therefore strengthening the organization and creating a vicious circle of misery and violence.
Źródło:
Krakowskie Studia Międzynarodowe; 2014, 3; 131-145
1733-2680
2451-0610
Pojawia się w:
Krakowskie Studia Międzynarodowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of strip roads on volume increment of edge trees
Autorzy:
Stempski, Włodzimierz
Jabłoński, Krzysztof
Jakubowski, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/2067433.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
strip road
wood increment
sunlight influx
Opis:
An analysis was made of 13-year wood volume increments on pine trees growing in the immediate vicinity of strip roads, at distances of 2-4 m and 8-10 m (the control). The widths of the strip roads were 3.5 m (short wood extraction with a forwarder) and 2.5 m (long wood skidding with an agricultural tractor), and they were cut during the first thinning. Also, compensation for the lost wood, resulting from increased growth of trees near the strip roads, was estimated. Tree volumes were calculated by the tree section method, based on measurements of yearly tree rings, taken with an electronic caliper on wood disks cut from the centers of 2-meter-long tree sections taken from sample trees. The percentage compensation for volume losses was calculated by comparing the increased volume increment of edge trees with the volume (and its 13-year lost increment) of trees removed from the strip roads. The study showed an increased volume increment of edge trees compared with trees growing deeper in the stand. In the case of wider strip roads, the increased volume increment was also present on trees growing at a distance of about 3 m from the strip roads. After 13 years the increased volume increment on trees bordering the strip roads and growing at a distance of 2-4 m from the strip roads compensated for 35% (wider strip roads) and 28% (narrower strip roads) of the lost wood volume and its unrealized increment.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2021, 64, 208; 5--15
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Organization of the highway strip repair process
Autorzy:
Ćwik, D.
Olkowska, E.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/949503.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
highway strip
airfields
airstrips
runway repair processes
Opis:
The article presents the possibilities of advance development of detailed organization-technical plans for the repair of Highway Strips, which will enable their effective use, particularly during combat operations – while maintaining the required time and technical standards at the same time. The main objectives of Highway Strips were presented; their role in securing military aviation activities and historical conditions for their creation. The concept of HS (Highway Strip) was defined along with the modern principles for their construction, modernization and renovation. Based on a selected example, the principles for evaluating the technical condition of their pavement and the repair possibility assessment were presented. At the same time, typical damage to HSs and factors affecting such damage were presented. Next, the methods and technologies for repairing various types of bituminous pavement damage repairs were discussed, with particular emphasis on the methods of repairing cracks, surface damage, deep damage and asphalt renovation. A schedule for the “Wielbark” highway strip was also developed, and the necessary calculations of the repair times, as well as the resources and resources for securing these operations were made. The article is concluded with a short summary and a proposal for further work, aimed at inhibiting the destructive processes of Highway Strips in Poland.
Źródło:
Journal of KONES; 2018, 25, 3; 111-120
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of current knowledge on strip-till cultivation and possibilities of its popularization in Poland
Autorzy:
Różewicz, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2148464.pdf
Data publikacji:
2022-06-30
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
strip-till
cultivation systems
soil quality
yield
Opis:
In this review paper strip-till has been characterized from the point of view of the latest scientific research and practi- cal justification of the advisability of using and popularizing this cultivation method in Poland for various crop species. Analysis of scientific literature has shown that strip-till has a beneficial ef- fect on crops and soil properties. It reduces the number of tillage operations, and thus labour costs and fuel consumption. Further improvement of strip-till cultivation should be related to the im- provement of seeding units designed for this cultivation technol- ogy, as well as to the implementation of precision farming solu- tions related to the application of fertilizers and their effective use by plants. In connection with the implementation of cultivation technologies improving soil quality and reducing the negative im- pact of agriculture on the environment, strip-till technology has a chance to be much more widely used in Poland and may replace traditional plough tillage.
Źródło:
Polish Journal of Agronomy; 2022, 49; 20-30
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Low Deformation Asymmetric Rolling on Microstructure and Texture of the Polycrystalline Copper
Autorzy:
Uniwersał, A.
Wróbel, M.
Wroński, S.
Kalemba-Rec, I.
Wroński, M.
Wierzbanowski, K.
Baczmański, A.
Bacroix, B.
Powiązania:
https://bibliotekanauki.pl/articles/353907.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asymmetric rolling
polycrystalline copper
microstructure refinement
strip curvature
Opis:
In the most recent years the asymmetric rolling (AR) attracts attention of researchers and technologists. This process can improve some technological parameters (e.g. modification of rolling torque and load, power requirements, etc.) as well as provide the possibility of grain refinement in a relatively inexpensive way. Most of the reports concerning microstructural changes produced by AR refer to high deformations imposed in highly asymmetric conditions. However, such rolling conditions are difficult to control, so there are no prospects to their quick industrial implementation. The present paper refers to relatively low deformation and low asymmetry rate, that is much more interesting for the industry. It was shown that bending of the rolled band (important disadvantage of the AR technology) can be controlled by adjusting of the amount of deformation and asymmetry. It was also shown that ca. 30% reduction in thickness during cold rolling, together with a relatively low asymmetry, reduces significantly the grain size and produces a more fragmented microstructure inside grains of the polycrystalline copper comparing to the symmetric rolling (SR). The material hardness after AR is higher than after the SR. Moreover, the crystallographic texture asymmetry, expressed by its rotation around the transverse direction, is observed in the AR material.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2183-2188
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soil types and their relations with radon concentration levels in Middle Governorate of Gaza Strip, Palestine
Autorzy:
Ubeid, Khalid Fathi
Ramadan, Khaled Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/2088223.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
grain-size distribution
radon
pollution
Gaza Strip
Palestine
Opis:
Determination of natural radioactivity has been carried out in surface and core agricultural soil samples collected from various sites in the Middle Governorate – Gaza Strip, Palestine. Mechanical and chemical analysis has been done to determine soil characteristics. Radon activity concentration measurements were carried out using solid state nuclear tracks detectors, Cr-39. The mechanical analysis results show that they belong to two classes, sandy loam and loamy sand. The sandy loam soil was observed in the eastern side of the study area, whereas the loamy sand was observed in western and middle parts. The radon concentration levels were higher in core samples and were proportionate to the soil depth. Also they were higher in sandy loam than loamy sand soil samples. The radon concentration levels had a positive correlation with fine grains (clay- to silt-size) of soil sample which translocated from upper to lower horizons of soil during its development. Additionally, there was a positive correlation with pH and water content, whereas a negative correlation was observed with organic matter and potassium contents. The positive correlation referred to a large specific surface of fine grains which were located in lower horizons of soil and were able to adsorb more water and consequently led to high radon concentration levels.
Źródło:
Polish Journal of Soil Science; 2020, 53, 1; 55-72
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soil types and their relations with radon concentration levels in Middle Governorate of Gaza Strip, Palestine
Autorzy:
Ubeid, K.F.
Ramadan, K.A.
Powiązania:
https://bibliotekanauki.pl/articles/971260.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
grain-size distribution
radon
pollution
gaza strip
palestine
Opis:
Determination of natural radioactivity has been carried out in surface and core agricul- tural soil samples collected from various sites in the Middle Governorate – Gaza Strip, Palestine. Mechanical and chemical analysis has been done to determine soil characteristics. Radon activity concentration measurements were carried out using solid state nuclear tracks detectors, Cr-39. The mechanical analysis results show that they belong to two classes, sandy loam and loamy sand. The sandy loam soil was observed in the eastern side of the study area, whereas the loamy sand was observed in western and middle parts. The radon concentration levels were higher in core samples and were proportionate to the soil depth. Also they were higher in sandy loam than loamy sand soil samples. The radon concentration levels had a positive correlation with fine grains (clay- to silt-size) of soil sample which translocated from upper to lower horizons of soil during its development. Additionally, there was a positive correlation with pH and water content, whereas a negative correlation was observed with organic matter and potassium contents. The positive cor- relation referred to a large specific surface of fine grains which were located in lower horizons of soil and were able to adsorb more water and consequently led to high radon concentration levels.
Źródło:
Polish Journal of Soil Science; 2020, 53, 1
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Avigdor Lieberman’s policy towards the European Union
Autorzy:
Zawada, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/521544.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Wrocławski. Wydział Nauk Społecznych. Instytut Studiów Międzynarodowych
Tematy:
Avigdor Lieberman
Gaza Strip
European Union
political influence
Źródło:
Wschodnioznawstwo; 2017, 11; 457-468
2082-7695
Pojawia się w:
Wschodnioznawstwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient Positioning of Two Long-Range Passenger Aircraft in Formation Flight
Autorzy:
Antczak, Adam
Lasek, Maciej
Sibilski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/36782619.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
formation flight
optimisation
strip theory
dynamics of flight
Opis:
In today’s world, each airline is forced to look for new savings opportunities. One of the methods may be the use of formation flights in daily flight operations, which may allow a reduction in fuel consumption by several percentages. The paper presents the genesis of how the consideration of such flights and the possibility of their implementation in an airline had started. The leader’s plane generates vortices, which, with the proper alignment of the planes to one another, can reduce the drag on the wingman. However, the wrong position may not only have no positive effect but also may be a threat to stable wingman flight. The article presents a method of using these vortices in such a way as to have a positive impact on the aerodynamics of the wingman. A favourable position in the vertical and horizontal axes will be determined in relation to the vortex generated by the leader’s plane in order to obtain the greatest benefit in reducing fuel consumption. The paper presents an operational analysis of the possibility of maintaining such a distance to obtain profit on fuel but also to ensure the highest level of safety of the flight.
Źródło:
Transactions on Aerospace Research; 2022, 3 (268); 21-31
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Locating-Total Dominating Sets in Strips of Height 3
Autorzy:
Junnila, Ville
Powiązania:
https://bibliotekanauki.pl/articles/31339416.pdf
Data publikacji:
2015-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
locating-total dominating set
domination
square grid
strip
Opis:
A set C of vertices in a graph G = (V,E) is total dominating in G if all vertices of V are adjacent to a vertex of C. Furthermore, if a total dominating set C in G has the additional property that for any distinct vertices u, v ∈ V \ C the subsets formed by the vertices of C respectively adjacent to u and v are different, then we say that C is a locating-total dominating set in G. Previously, locating-total dominating sets in strips have been studied by Henning and Jafari Rad (2012). In particular, they have determined the sizes of the smallest locating-total dominating sets in the finite strips of height 2 for all lengths. Moreover, they state as open question the analogous problem for the strips of height 3. In this paper, we answer the proposed question by determining the smallest sizes of locating-total dominating sets in the finite strips of height 3 as well as the smallest density in the infinite strip of height 3.
Źródło:
Discussiones Mathematicae Graph Theory; 2015, 35, 3; 447-462
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of weaponized kites and balloons in the Israeli – Palestinian conflict
Autorzy:
Zych, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/576529.pdf
Data publikacji:
2019-04-21
Wydawca:
Akademia Sztuki Wojennej
Tematy:
Israel
Gaza Strip
arson terrorism
incendiary devices
asymmetric warfare
Opis:
The aim of this paper is to analyse the use of weaponised incendiary kites and helium balloons in the Israeli-Palestinian hostilities between March and December 2018. The paper argues that arson started with incendiary kites and balloons can easily be exploited for terrorist purposes and poses a serious challenge for regular armed forces and for civilian emergency services. The paper examines the Palestinian ‘Great March of Return’ as a background for the development of a new Hamas’ tactic and briefly describes the chronology of arson terrorism in the context of other hostilities at the Gaza-Israeli border. The study focuses on the two following questions: why are the kites and balloons useful for the current goals of Hamas and how do the Israelis respond to this new threat? The study uses comparative scientific literature and document analysis, the analysis of statements released by the Israeli authorities and the Israeli media reports related to the arson attacks. The main findings include the role of simple, non-lethal weapons in spreading fear for terrorist purposes and the advantages of turning everyday-use materials into weapons in a situation where there is limited access to regular arms. The second part of the study deals with the effects of arson attacks on the Israeli side of the conflict and the countermeasures undertaken in the Gaza Periphery. The author concludes that airborne arson attacks pose a serious threat to advanced Israeli defence systems, solely because of their primitive and unpredictable character. The overall findings of this paper present the threat of arson terrorism in the context of an asymmetric conflict.
Źródło:
Security and Defence Quarterly; 2019, 27, 5; 71-83
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Naukowiec jak malowany”. Uwagi o micie i komiksie
Autorzy:
Sochacki, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/644541.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
comic
comics strip
myth
stereotype
sign
science
Barthes
Eliade
Opis:
The article is a treatise in the field of anthropology of science. The main goal of the essay is the antropological analysis of the comics Expercience by Emilia Dziubak. The author treats the comics as a source of knowledge about stereotypes for the scientist and science. Especially, he points to the mythological patterns used in the comics.
Źródło:
Prace Etnograficzne; 2014, 42, 3; 245-256
0083-4327
2299-9558
Pojawia się w:
Prace Etnograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production Line Modelling in Accordance with the Industry 4.0 Concept as an Element of Process Management in the Iron and Steel Industry
Autorzy:
Niekurzak, Mariusz
Kubińska-Jabcoń, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/2023962.pdf
Data publikacji:
2021-12
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot rolling
logistic model
mill
steel
strip
stock management
Opis:
Simulations are becoming one of the most important techniques supporting production preparation, even in those industrial sectors with atypical technological processes, such as in metallurgy, where there is a multiphase material flow. This is due to the fact that in the conditions of a market economy, enterprises have to solve more and more complex problems in a shorter time. On the basis of the existing production process and the knowledge of the flow characteristics in a given process, a model is built, which, when subjected to simulation tests, provides experimental results in the scope of the defined problem. The use of computer techniques also creates new possibilities for the rational use of the reserves inherent in each technological process. Taking into account the existing demand and the state of modern technology, the computer model can be a source of information for further analysis and decision-making processes supporting company management. At work a model of the logistic system was made on the example of a hot-rolled steel strip mill, on which simulation experiments were carried out to improve the effectiveness and efficiency of the analysis production line. The presented article aims to disseminate the idea of ??Industry 4.0 in Polish companies from the manufacturing industry sector, taking into account simulation techniques.
Źródło:
Management and Production Engineering Review; 2021, 14, 4; 3-12
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tsunami event identified in a sedimentary record of the Gaza Strip, Palestine
Autorzy:
Ubeid, Khalid Fathi
Powiązania:
https://bibliotekanauki.pl/articles/2025075.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tsunami
sedimentology
pottery shard
rip-up clast
Gaza Strip
Opis:
The outcrop of the tsunami deposits, about 6 m thick, is located in the archaeological site Tel Askan in the Al Zhraa locality, southwest of the Gaza City. These deposits are unconformably underlain by sand dunes and sharply overlain by a palaeosol. They are pale gray sands mixed with volcanic ash and fine-grained deposits, and are intercalated with peat, few centimetres thick. The sand-sized grains are well rounded and well sorted, and consist mainly of quartz and subordinate of feldspar. Both macro- and microfossils were observed from tsunami deposits. Additionally, rip-up clasts and pottery shards were observed, indicating higher-flow regime. The potteries in tsunami deposits provide evidence for tsunami inundation at distance of about 1 km from the present shoreline.
Źródło:
Studia Quaternaria; 2021, 38, 1; 43-51
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Road air strips (RAS) in retrospective, present and prospective terms
Drogowe odcinki lotniskowe (DOL) w ujęciu retrospektywnym, obecnym i prospektywnym
Autorzy:
Kawka, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/2206362.pdf
Data publikacji:
2023
Wydawca:
Towarzystwo Wiedzy Obronnej
Tematy:
lotnisko
lądowisko
drogowy odcinek lotniskowy
DOL
zagrożenia
destrukcja
utrzymywanie zdolności
airport
air strip
road air strip
RAS
threats
destruction
maintaining capacity
Opis:
The submitted publication is a kind of scientifically justified attempt to identify knowledge (in retrospective, present and prospective terms), relating directly to road sections of the airports (RAS) – as elements of the state's airport infrastructure. Mutual and decades-long influence of classified content on RAS, in a collision with its marginal use during various types of military exercises, has generated a situation in which issues focusing on RAS and their literary presentation can be perceived at an almost marginal level. In turn, war experiences in Ukraine (especially after February 24, 2022) indicate that these facilities are important elements of the widely perceived defence system of the state. The invoked importance became the same impulse to conduct scientific research, the written study of which is presented in this study.
Przedkładana publikacja stanowi swoistego rodzaju próbę naukowo uzasadnionej identyfikacji wiedzy (w ujęciu retrospektywnym, obecnym i prospektywnym), odnoszącej się wprost do drogowych odcinków lotniskowych (DOL1 ) – jako elementów infrastruktury lotniskowej państwa. Wzajemne i trwające przez dekady oddziaływanie treści niejawnych o DOL, w zderzeniu z marginalnym ich wykorzystywaniem podczas różnego rodzaju ćwiczeń wojskowych – wygenerowało sytuację, w której zagadnienia ogniskujące się wokół DOL i ich literacka prezentacja może być postrzegana na poziomie niemalże marginalnym. Z kolei doświadczenia wojenne z terytorium Ukrainy (zwłaszcza po 24. lutego 2022 r.) wskazują, że obiekty te są ważnymi elementami szeroko postrzeganego systemu obronnego państwa. Przywoływana ważność stała się tym samym impulsem do przeprowadzenia adekwatnych badań naukowych, których pisemne opracowanie przedkładane jest w niniejszym opracowaniu.
Źródło:
Wiedza Obronna; 2023, 1; 171--192
0209-0031
2658-0829
Pojawia się w:
Wiedza Obronna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Quality of Metal Sheet Edges After Strip Slitting Processes in Integrated Lines on the Quality of Laser Welds
Autorzy:
Stańczyk, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2201906.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
strip slitting
sheet metal processing
slitting lines
laser welding
Opis:
This paper concerns issues related to the processes of sheet metal slitting and laser welding in technological lines. It includes a discussion of the industry needs and requirements for semi-finished products in the form of thin metal sheets. Furthermore, the basic technical solutions used in automatic strip slitting equipment and selected process parameters based on a specific material are described. The presented results were obtained on the basis of practical verification of the assumptions using newly designed devices implemented into production. The research material consisted of samples taken from S235JR sheet after strip slitting on an integrated slitting line and samples taken from a finished sideboard profile after laser welding. The welding process had been carried out using a CO2 laser, TruLaser Cell 1100, with a power of 4kW. Areas of a laser-welded joint were analysed for varied condition of the sheet edges at the production speed of 4m/min. Microscopic weld examination for the sheet edges without strains or burrs revealed a deep penetration at the level of 2355 µm, allowing to obtain a joint with a length of 1607 µm, a small heat-affected zone, and the correct structure. The paper shows possible problems and causes of their occurrence in industrial conditions.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 136--146
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gurney flap and T-strip alternativesin application to typical aircraft steer surface
Autorzy:
Sieradzki, A.
Powiązania:
https://bibliotekanauki.pl/articles/247018.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
CFD
steer
stabilizer
Gurney flap
T-strip
stabilizator
listwa Gurneya
Opis:
Classic Gurney flap and double Gurney flap (called T-strip) are well-researched trailing edge modifications used in aerospace engineering. However, one of the inevitable effects of their use is the aerodynamic drag increase at low lift conditions, concerned as the major drawback of these solutions. This article presents Gurney flap and T-strip passive alternatives, which guarantee similar advantages in terms of e.g. lift enhancement, but without significant drag increase. Their aerodynamic analysis was performed on the application case of a typical symmetrical aircraft stabilizer with movable steer. Both solutions, consisting of plates nearly parallel to the direction of flow, were modelled as two-dimensional cases and CFD calculations were performed for specified range of angles of attack and steer deflections. Obtained aerodynamic characteristics allowed assessing the influence of selected modifications on the stabilizer effectiveness, as well as on hinge moment characteristics. The flow pattern changes in the presence of analysed devices were also investigated. In this way, performed analysis provided valuable information about the advantages and disadvantages of using of such devices in comparison to classic Gurney Flap and double Gurney flap. The results showed that using proposed solutions gives the possibility of significant reduction of the aerodynamic drag of the whole stabilizer at low lift conditions, while still maintaining favourable lift characteristics.
Źródło:
Journal of KONES; 2018, 25, 1; 347-354
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwość wykorzystania w warzywnictwie uprawy pasowej i aplikacji gnojowicy w aspekcie jej oddziaływania na stan sanitarny gleby
Ability to use in vegetable cultivation method of strip-till and slurry applications in aspect of its impact on the sanitary condition of the soil
Autorzy:
Kosicka-Dziechciarek, D.
Wolna-Maruwka, A.
Piechota, T.
Waraczewska, Z.
Swędrzyńska, D.
Tomkowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/338939.pdf
Data publikacji:
2017
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
gnojowica
mikroorganizmy patogenne
uprawa pasowa
pathogenic microorganisms
slurry
strip-till
Opis:
Gnojowica od wielu lat jest stosowana jako nawóz naturalny. Zawarte w niej związki azotu, potasu, fosforu, wapnia, magnezu, siarki, chloru i inne czynią ją cennym źródłem substancji mineralnych szczególnie potrzebnych roślinom. Zastosowanie gnojowicy w uprawie roślin warzywnych może przyczynić się do rozwiązania problemu związanego z jej produkcją czy nadmierną ilością już wyprodukowanej. Jednakże wprowadzenie omawianego nawozu naturalnego do gleby może stwarzać zagrożenie sanitarne ze względu na możliwość występowania mikroorganizmów chorobotwórczych (Escherichia coli, Salmonella spp. itp.). Do precyzyjnego dozowania tego nawozu naturalnego w uprawach niektórych roślin, w tym warzyw, stosowana jest innowacyjna metoda strip-till, która przyczynia się do stworzenia korzystnych warunków do siewu i kiełkowania roślin.
Slurry has been used as a natural fertilizer for many years. It contains compounds of nitrogen, potassium, phosphorus, calcium, magnesium, sulphur, chlorine and other elements, so it is a valuable source of mineral substances that are particularly necessary for plants. The use of slurry vegetable growing may help to solve the problem of its excessive amount, both which has already produced and which is being produced. However, when this fertilizer is entered into soil, it may cause a sanitary threat due to the content of pathogenic microorganisms (Escherichia coli, Salmonella, etc.). Strip-till is an innovative method used in the cultivation of some plants for precise dosage of the natural fertilizer. It creates good conditions for sowing and germination.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2017, 17, 2; 127-138
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual Band Integrated Wideband Multi Resonating Patch Antenna for C–Band and Ku–Band Applications
Autorzy:
Srivastava, Karunesh
Singh, Sweta
Singh, Aditya Kumar
Singh, Rajeev
Powiązania:
https://bibliotekanauki.pl/articles/226214.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
micro-strip antenna
dual-band
wideband
cband
ku-band
HFSS
Opis:
A wideband antenna with dual band characteristic at 5.33/14.3GHz with resonating frequencies for wireless applications is presented. The strategy of the design is to introduce multiband in antenna band. Bandwidth of the antenna increases by embedding annular ring on the radiating patch and four bands are achieved by introducing coupling gap between the patches. Surface current distribution is analyzed at different resonating frequencies for understanding the radiation mechanism and effect of annular ring. The antenna parameters such as return loss, radiation pattern, gain, VSWR and group delay are discussed. The impedance bandwidth of the proposed dual band antenna at lower resonant frequency is 12.7% (simulated) and 9.8 % (measured) whereas at upper resonant frequency is 15.3 % (simulated) and 13.97 % (measured).
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 347-352
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykonanie wykopów do posadowienia ław fundamentowych
Autorzy:
Hrytsuk, M.
Kosmala-Kot, W.
Koniecko, M.
Hulboj, R.
Powiązania:
https://bibliotekanauki.pl/articles/2068389.pdf
Data publikacji:
2010
Wydawca:
Politechnika Częstochowska
Tematy:
ława fundamentowa
wykop
podłoże
fundament
strip foundation
excavation
groundwork
foundation
Opis:
Przedstawiono obliczanie ław fundamentowych na podłożu gruntowym o kształcie trapezowym. W takim przypadku rozkład naprężeń pod podstawą płyt będzie mieć kształt trapezu o zerowych wartościach na jego krawędziach i maksymalnych w środku. Taki rozkład naprężeń zmniejsza siły wewnętrzne w przekrojach obliczeniowych płyt o 15 ÷ 20%.
В cтaтьe даётся расчёт ленточных фундаментов на грунтовых основанияx в виде трапеции. B даном случае распределениe нaпряжений под подошвой фундамента будет тоже иметь вид трапеции с нулевыми значениями его на краях и максимальными в середине. Такое распределениe нaпряжений уменьшает внутренние усилия в чётных сечениях на 15÷20%, что даёт возможность запpоектировать более рациоальные конструкции ленточных фундаментов.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2010, 16 (166); 127-130
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of the Asymmetric Plate Rolling Process in the Finishing Stand 3600
Analiza asymetrycznego procesu walcowania blach grubych w klatce wykańczającej 3600
Autorzy:
Kawałek, A.
Dyja, H.
Knapiński, M.
Banaszek, G.
Kwapisz, M.
Powiązania:
https://bibliotekanauki.pl/articles/356016.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical modelling
asymmetric rolling
strip shape
strip bending
pressure of the metal on the rolls
modelowanie numeryczne
walcowanie asymetryczne
zmiana kształtu
wyginanie pasma
Opis:
In order to enhance the quality of plates, various solutions are being implemented, including normalizing rolling, the process of rolling followed by accelerated cooling, as well as new roll gap control systems. The hydraulic positioning of rolls and the working roll bending system can be mentioned here. The implementation of those systems results in increased loads of the rolling stands and working tools, that is the rolls. Another solution aimed at enhancing the cross-sectional and longitudinal shape of rolled plate is the introduction of asymmetric rolling, which consists in the intentional change of the stress and strain state in the roll gap. Asymmetric rolling systems have been successfully implemented in strip cold rolling mills, as well as in sheet hot rolling mills. The paper present results of studies on the effect of roll rotational speed asymmetry and other rolling process parameters on the change in the shape of rolled strip and the change of rolls separating force for the conditions of normalizing rolling of plates in the finishing stand. The variable process parameters were: the roll rotational speed asymmetry factor, av; the strip shape factor, h0/D; and the relative rolling reduction, ε. Working rolls of the diameter equal to 1000 mm and a constant lower working roll rotational speed of n = 50 rpm were assumed for the tests. The asymmetric rolling process was run by varying the rotational speed of the upper roll, which was lower than that of the lower roll. The range of variation of the roll rotational speed factor, av =vd/vg, was 1.01÷1.15. A strip shape factor of h0/D = 0.05÷0.014 was assumed. The range of rolling reductions applied was ε = 0.08÷0.50. The material used for tests was steel of the S355J2G3 grade. For the simulation of the three-dimensional plastic flow of metal in the roll gap during the asymmetric hot rolling of plates, the mathematical model of the FORGE 2008 ® program was used. For the mathematical description of the effect of rolling parameters on the strip curvature and rolls separating force the special multivariable polynomial interpolation was used. This method of tensor interpolation in Borland Builder programming environment was implemented. On the basis of the carried out analysis can be state, that by using the appropriate relative rolling reduction and working roll peripheral speed asymmetry factor for a given feedstock thickness (strip shape ratio) it is possible to completely eliminate the unfavorable phenomenon of strip bending on exit from the roll gap, or to obtain the permissible strip curvature which does not obstructs the free feed of the strip to the next pass or transferring the plate to the accelerated plate cooling stations. Additionally by introducing the asymmetric plate rolling process through differentiating working roll peripheral speeds, depending on the asymmetry factor used, the magnitude of the total roll separating force can be reduced and, at the same time, a smaller elastic deflection of rolling stand elements can be achieved. As a result smaller elastic deflection of the working rolls, smaller dimensional deviations across its width and length finished plate can be obtained.
W celu poprawy jakości blach grubych stosowane są różne rozwiązania obejmujące walcowanie normalizujące, przyspieszone chłodzenie po walcowaniu, jak również nowe systemy sterowania szczelina walcownicza. Należy również wspomnieć o systemach hydraulicznej nastawy walców oraz przeginania walców roboczych. Zastosowania tych systemów powoduje wzrost obciążenia klatki walcowniczej i jej osprzętu, jak również walców. Innym rozwiązaniem powodującym poprawę wzdłużnego i poprzecznego kształtu walcowanych blach jest wprowadzenie walcowania asymetrycznego, które wprowadza kontrolowana zmianę stanu naprężenia i odkształcenia w kotlinie walcowniczej. Systemy asymetrycznego walcowania były skutecznie zastosowane podczas walcowania taśm na zimno oraz w walcowniach gorących podczas walcowania cienkich blach. W artykule przedstawiono wyniki badań wpływu asymetrii prędkości obrotowej walców i innych parametrów procesu na zmianę kształtu walcowanego pasma oraz zmianę siły nacisku na walce w warunkach walcowania normalizującego blach grubych w klatce wykańczającej. Zmiennymi parametrami procesu były: współczynnik asymetrii prędkości obrotowej walców, av; współczynnik kształtu pasma, h0/D; oraz gniot względny, ε. Do badań założono średnice walców roboczych równa 1000 mm i stałą wartość prędkości obrotowej dolnego walca n = 50 obr/min. Warunki asymetrycznego procesu walcowania uzyskano przez zróżnicowanie prędkości obrotowej górnego walca, która przyjmowano niższą niż walca dolnego. Zakres zmian współczynnika asymetrii prędkości obrotowych av =vd/vg przyjeęo: 1,01÷0,15. Założono współczynnik kształtu pasma h0/D w zakresie 0,05÷0,014 oraz przyjęto wartości gniotu względnego ε w przedziale: ε = 0.08÷0.50. Badanym materiałem była stal w gatunku S355J2G3. Do symulacji trójwymiarowego, plastycznego płynięcia metalu w kotlinie walcowniczej podczas asymetrycznego walcowania blach grubych na gorąco wykorzystano model matematyczny programu FORGE 2008 ® . W celu matematycznego opisu wpływu parametrów walcowania na krzywiznę pasma i siłę nacisku metalu na walce zastosowano interpolacje wielomianem wielu zmiennych. Metodę interpolacji tensorowej zaimplementowano w środowisku programowym Borland Builder. Na podstawie przeprowadzonej analizy można stwierdzić, że zastosowanie odpowiedniego gniotu względnego i współczynnika asymetrii prędkości obwodowych walców, dla danej wartości wysokości początkowej pasma (współczynnika kształtu pasma) umożliwia całkowite wyeliminowanie niekorzystnego zjawiska wyginania się pasma po wyjściu z kotliny walcowniczej lub uzyskanie dopuszczalnej krzywizny pasma, która nie zakłóca wprowadzenia pasma do kolejnego przepustu lub jego transportu do urządzeń chłodzacych. Dodatkowo przez wprowadzenie procesu walcowania asymetrycznego, w zależności od zastosowanego współczynnika asymetrii, można uzyskać zmniejszenie siły nacisku metalu na walce, a jednocześnie zachodzi zmniejszenie sprężystego ugięcia elementów klatki walcowniczej. Dzięki zmniejszeniu sprężystego ugięcia klatki walcowniczej uzyskuje się końcową blachę o zmniejszonych odchyłkach wymiarowych wzdłuż jej szerokości i długości.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1533-1538
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Udarno-ustalostnaja i staticheskaja treshhinostojjkost konstrucionnykh materialov i polosy plastichnosti u vershiny iskhodnojj treshhiny
The shock-fatigue and static crack resistance of metal construction materials and the crack tip plasticity strips
Autorzy:
Kohut, N.
Powiązania:
https://bibliotekanauki.pl/articles/78093.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
fatique
beam
static resistance
diffraction line
bending stress
plastic strip
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 4
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a rapid immunochromatographic assay for detection of antibodies against porcine epidemic diarrhea virus
Autorzy:
Li, R.
Ma, J.
Tian, X.
Yu, Y.
Qiao, S.
Wang, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2087760.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porcine epidemic diarrhea virus
immunochromatographic test strip
nucleocapsid protein
diagnosis
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 139-147
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ składu chemicznego stali i sposobu walcowania drutu na wymiary i właściwości taśm na sprężyny
Influence of chemical composition of steel and wire rolling method on dimensions and properties of spring strips
Autorzy:
Burdek, M.
Powiązania:
https://bibliotekanauki.pl/articles/182053.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
drut
walcowanie
spłaszczanie
taśma
sprężyna
wire
rolling
flattening
strip
spring
Opis:
Przedmiotem artykułu jest walcowanie drutu na taśmy przeznaczone do wyrobu sprężyn płaskich. Przedstawiono sposób wyliczania wymaganej średnicy drutu oraz poszerzenia taśmy w procesie walcowania. Wykonano próby walcowania z zastosowaniem walców o zróżnicowanych średnicach i schematach odkształcania. Analizowano wymiary taśm i ich właściwości mechaniczne.
The subject of this article is wire rolling for strips for the production of flat springs. The method of calculating the required wire diameter and strip widening during rolling was presented. Attempts to roll with rollers with various diameters and deformation models were made. The dimensions of strips and their mechanical properties were analysed.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2016, T. 68, nr 3, 3; 27-30
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 137

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