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Tytuł:
Why hot water freezes faster than cold?
Autorzy:
Kurić, L
Powiązania:
https://bibliotekanauki.pl/articles/412412.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
water
hot Water
freezing hot water
freezing cold water
Opis:
The modern science mainly treats the biochemical basis of sequencing in bio-macromolecules and processes in chemistry and biochemistry. In these informational cybernetic principles we seek to answer the following question: Why hot water freezes faster than cold? These principles determine the freezing point of water. Determine that the hot water freezes faster than cold. What we did is the following: We translated the physical and chemical parameters from the language of water into the digital language of programmatic, cybernetic and information principles. This we did by using the adequate mathematical algorithms. By using chemical-information procedures, we calculated the numerical value for the information content of molecule of water. What we got this way is the digital picture of this molecule. These digital pictures reveal to us a whole new dimension of water. They reveal to us that the chemical process of this molecule is strictly conditioned and determined by programmatic, cybernetic and information principles.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 119-134
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and Microstructural Response of Near Beta Ti Alloys to Hot Tensile Testing
Autorzy:
Abbasi, S. M.
Momeni, A.
Daraee, M.
Akhondzadeh, A.
Mirsaeed, S. G.
Powiązania:
https://bibliotekanauki.pl/articles/351391.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermomechanical processing
hot deformation
dynamic softening
yield-point phenomena
hot ductility
Opis:
Hot tensile tests were carried out on Timetal-125 and Timetal-LCB near beta Ti alloys at temperatures in range of 600-1000°C and constant strain rate of 0.1 s-1. At temperatures below 700-800°C, the homogenuous and total strains for Timetal-LCB were greater than those for Timetal-125. In contrast, at temperatures over 800°C, Timetal-125 showed better hot ductility. The yield point phenomena was observed in Timetal-LCB at all temperatures. Unlikely, for Timetal-125, it was observed only at temperatures over 800°C. The weaker yield point phenomena in Timetal-125 could be attributed to the negative effect of Al on the diffusion of V. At all temperatures Timetal-LCB exhibited higher strength than Timetal-125. It was found that there should be a direct relationship between the extent of yield point phenomena and strength and dynamic softening through hot tensile testing. It was observed that at temperatures beyond 800°C (beta phase field in both alloys) dynamic recrystallization can progress more in Timetal-125 than in Timetal-LCB. These results were in good agreement with the better hot ductility of Timetal-125 at high temperatures. At low temperatures, i.e. below 700-800°C, partial dynamic recrystallization occurs in beta and dynamic globularization in alpha phase. These processes progress more in Timetal-LCB than in Timetal-125.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 815-823
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hot Processing of Cast and PM Ti-6Al-4V Alloy
Autorzy:
Wojtaszek, M.
Śleboda, T.
Korpała, G.
Powiązania:
https://bibliotekanauki.pl/articles/352910.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloy
hot compaction
hot forging
thermo-mechanical parameters
microstructure
properties
Opis:
Quantitative and qualitative evaluation of the influence of the applied sample morphology as well as parameters of deformation on the microstructure and selected properties of Ti-6Al-4V alloy after deformation was presented. Both cast Ti-6Al-4V alloy and powder compacts were used as the material under investigation. P/M preform was produced from the mixture of elemental powders, by hot compaction. The samples of compacts as well as cast alloy were subjected to plastometric tests under various conditions. The influence of the state of the investigated Ti-6Al-4V alloy on the character of flow curves was determined. The microstructure and hardness after deformation were evaluated and compared. Basing on the results of plastometric tests, the suitable thermo-mechanical parameters of forging of Ti-6Al-4V alloy were determined. The charge was machined from the compacts and from cast material, and both types of forging stock were hot-forged. The microstructure as well as hardness of the forgings were compared.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1115-1120
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of hot work procedures applied on board sea going vessels required by safety management system
Autorzy:
Kaminski, Włodzimierz
Szczepanek, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/27313677.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
safety management system
hot work
hot work management
system zarządzania bezpieczeństwem
Opis:
Purpose: reasons for writing the paper is to present, the optimal procedure to manage specific critical job as hot work on board sea going vessels. Design/methodology/approach: an analysis of various shipping companies safety management systems and requirements demanded to perform hot works. Findings: found that safety management systems and demands to perform hot works are varied between shipping companies. Research limitations/implications: management of specific high risk job as hot work to be unified. Practical implications: suggestion is given to unify procedures of hot work management Social implications: reduction of risk to happen undesired events and mitigations of hazards associated with hot work. Originality/value: recommendation to shipping companies for modification of safety management system where is necessary to improve safety on board.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 157; 237--254
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Forming Process of Energy-Absorbing Elements made from 7000 Series High-Strength Aluminum Alloy
Autorzy:
Jaśkiewicz, K.
Skwarski, M.
Polak, S.
Gronostajski, Z.
Krawczyk, J.
Kaczyński, P.
Chorzępa, W.
Powiązania:
https://bibliotekanauki.pl/articles/355556.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloys
hot forming
Opis:
The paper covers the research on the process of solutionizing of 7075 aluminum alloy in cold tools during the stamping of a high-strength structural element (B-pillar’s base). For technological reasons, in order to obtain high strength parameters of the 7075 alloy, it is necessary to carry out a solutionization process, which allows to obtain dispersion strengthening during ageing process. Properly performed heat treatment of the alloy increases the strength of the material to approx. 600 MPa. The combination of the process of solutionization with simultaneous shaping is aimed at improving and simplifying technological operations of aluminum alloy stamping, shortening the duration of the manufacturing process and reducing production costs. The manufactured lower part of the B-pillar will be used for the verification of the validity of the developed method. During the experiment, a series of stamping tests were carried out, in which the lubricants, pressure and position of the upper and lower blankholders were the variables. The obtained results allow to estimate the influence of the cooling conditions on the strength of the drawpieces obtained after the process of artificial ageing. In order to verify and analyse the results more quickly, a numerical simulation was carried out.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 697-705
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skupiska przestępstw mieszkaniowych w Szczecinie
Hot spots of residential crime in Szczecin
Autorzy:
Sypion-Dutkowska, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/1023041.pdf
Data publikacji:
2018-08-23
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Hot Spot
residential crime
crime prevention
hot spots
przestępstwa mieszkaniowe
zapobieganie przestępczości
Opis:
W niniejszym artykule dokonano wstępnej analizy skupisk przestępczości mieszkaniowej w Szczecinie w 2006 r., wyznaczając przestrzenne (wg osiedli) oraz czasowe (miesięczne i dobowe) hot spots (skupiska) przestępstw mieszkaniowych. Artykuł zawiera również rekomendacje CPTED (Crime Prevention Through Environmental Design) dotyczące zmniejszenia poziomu przestępczości oraz lęku przed zagrożeniem przestępczością.
The paper encloses the preliminary results of geographical analysis of crime in Szczecin. Using the GIS tools the spatial (according to 37 urban districts) and temporal (according to months and days) Hot Spots of residential crime in the year 2006, as well as 50% crime concentration area, were identified and presented on the maps and figures. Conclusively, based on the ideas of Crime Prevention Through Environmental Design, the recommendations for urban spatial and safety policy are formulated, aiming the crime prevention and reducing the crime fear.
Źródło:
Rozwój Regionalny i Polityka Regionalna; 2012, 20; 137-148
2353-1428
Pojawia się w:
Rozwój Regionalny i Polityka Regionalna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of tablets containing solid dispersion of ibuprofen manufactured by Hot Melt Impregnation process.
Autorzy:
Garbera, Kamil
Woś-Latosi, Katarzyna
Sawicki, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/895495.pdf
Data publikacji:
2019-04-30
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
Ibuprofen
solid dispersion
hot melt extrusion
hot melt impregnation
amorphisation
solubility enhancement
Opis:
The main assumption of given study was to develop tablets containing amorphous ibuprofen by hot melt extrusion process. However proposed manufacturing procedure demonstrates quite a few differences in comparison to a conventional hot melt extrusion. Accurately the given manufacturing procedure has been called a hot melt impregnation due to the process characteristics. As a product of described process a fine free flowing extrudate is obtained. Four different compositions have been proposed. Materials prepared by hot melt impregnation technique have been extensively examined in terms of physicochemical properties and then were subjected to tablet compression process. Obtained tablets were examined in terms of thermodynamic stability and compared to marketed product containing ibuprofen.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 2; 341-354
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane metody badań powłok ochronnych stosowanych na formy i rdzenie odlewnicze
Selected methods of testing protective coatings applied on casting moulds and cores
Autorzy:
Wildhirt, E.
Jakubski, J.
Sapińska, M.
Sitko, S.
Kamińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/391813.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
powłoki ochronne
lepkość
parametr hot distortion
protective coatings
viscosity
hot distortion parameter
Opis:
W niniejszym artykule przedstawione zostały wybrane metody badań związane z powłokami ochronnymi stosowanymi na masy formierskie i rdzeniowe w odlewnictwie. Metodykę badawczą podzielono na badania właściwości technologicznych mas formierskich i rdzeniowych pokrytych powłokami (tj. parametr hot distortion po naniesieniu powłok na formy wykonane z sypkich mas samoutwardzalnych ze spoiwami organicznymi) i fizykochemicznych (lepkość) gotowych powłok. Do badań wykorzystano powłoki z rozpuszczalnikami wodnymi oraz alkoholowymi. Formy przygotowano z sypkich mas samoutwardzalnych z żywicą furfurylową oraz fenolowo-formaldehydową, które zostały pokryte wodną powłoką oraz powłoką alkoholową. Badania przeprowadzono w Katedrze Tworzyw Formierskich, Technologii Formy i Odlewnictwa Metali Nieżelaznych na Wydziale Odlewnictwa AGH w Krakowie oraz w Instytucie Odlewnictwa w Krakowie.
This article presents selected research methods related to protective coatings used for sand moulds and cores in the foundry industry. The research methodology has been divided into studies of the technological properties of sand moulds and cores with applied coatings (the measurement of hot distortion parameter after deposition of coatings onto moulds made of loose self-hardening sands with organic binders) and physico-chemical properties (viscosity) of finished coatings. Coatings with aqueous and alcohol solvents were tested. Moulds were prepared from loose self-hardening sand mixtures with furfuryl and phenol-formaldehyde resins and were coated with water-based coatings and alcohol-based coatings. Studies were carried out in the Department of Moulding Materials, Mould Technology and Cast Non-Ferrous Metals at the AGH Faculty of Foundry Engineering in Krakow and at the Foundry Research Institute in Krakow.
Źródło:
Prace Instytutu Odlewnictwa; 2018, 58, 2; 125-131
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Hot Deformation Behavior of CuFe2 Alloy
Autorzy:
Schindler, I.
Sauer, M.
Kawulok, P.
Rodak, K.
Hadasik, E.
Jabłońska, M. Barbara
Rusz, S.
Ševčák, V.
Powiązania:
https://bibliotekanauki.pl/articles/353206.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper alloy CuFe2
hot ductility
stress-strain curves
hot deformation activation energy
Opis:
Nil strength temperature of 1062°C and nil ductility temperature of 1040°C were experimentally set for CuFe2 alloy. The highest formability at approx. 1020°C is unusable due to massive grain coarsening. The local minimum of ductility around the temperature 910°C is probably due to minor formation of γ-iron. In the forming temperatures interval 650-950°C and strain rate 0.1-10 s-1 the flow stress curves were obtained and after their analysis hot deformation activation energy of 380 kJ·mol-1 was achieved. Peak stress and corresponding peak strain values were mathematically described with good accuracy by equations depending on Zener-Hollomon parameter.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 701-706
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital twins as a modern approach to design of industrial processes
Autorzy:
Rauch, Lukasz
Pietrzyk, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/100193.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
computer system
hot rolling
optimization
Opis:
The objective of the paper was to describethe concept of a virtual, digital equivalent to a physical process. The basic idea of the virtual counterpart for the process called a digital twin is described first. Following this the hybrid computer system dedicated to the design of the optimal manufacturing technology for thin steel strips is presented. The models used in the system and the database are described. Numerical tests showing capabilities of the system recapitulate the work.
Źródło:
Journal of Machine Engineering; 2019, 19, 1; 86-97
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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