Temat: High pressure - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Diffusive and Displacive Phase Transformations in Nanocomposites under High Pressure Torsion
Autorzy:: Straumal, B.
Kilmametov, A.
Gornakova, A.
Mazilkin, A.
Baretzky, B.
Korneva, A.
Zięba, P.
Tematy:: high-pressure torsion
Ti-Fe alloys
phase transitions
high-pressure phases; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356575.pdf Link otwiera się w nowym oknie
Opis:: The high-pressure torsion (HPT) of Ti-Fe alloys with different iron content has been studied at 7 GPa, 5 anvil rotations and rotation speed of 1 rpm. The alloys have been annealed before HPT in such a way that they contained different amounts of α/α' and β phases. In turn, the β phase contained different concentration of iron. The 5 anvil rotations correspond to the HPT steady-state and to the dynamic equilibrium between formation and annihilation of microstructure defects. HPT leads to the transformation of initial α/α' and β-phases into mixture of α and high-pressure ω-phase. The α → ω and β → ω phase transformations are martensitic, and certain orientation relationships exist between α and ω as well as β and ω phases. However, the composition of ω-phase is the same in all samples after HPT and does not depend on the composition of β-phase (which is different in different initial samples). Therefore, the martensitic (diffusionless) transformations are combined with a certain HPT-driven mass-transfer. We observed also that the structure and properties of phases (namely, α-Ti and ω-Ti) in the Ti – 2.2 wt. % Fe and Ti – 4 wt. % Fe alloys after HPT are equifinal and do not depend on the structure and properties of initial α'-Ti and β-Ti before HPT.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Technical aspects of coal disintegration using high pressure water jet
Autorzy:: Borkowski, P.
Borkowski, J.
Bielecki, M.
Tematy:: high-pressure water jet
coal
disintegration; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/99756.pdf Link otwiera się w nowym oknie
Opis:: The high-pressure water jet comminution of coal is presents in the paper. For such procedure a special prototype of hydrojetting apparatus have been developed. Three different types of coal were examined: hard-, brown-, and charcoal. Obtained results point out that high-pressure water jet usage for such a purpose is very effective. Brown coal is slightly for charcoal. Such micronization effect gives even over 100,000 times increase Moreover charcoal susceptibility for intensive hydro-comminution causes that one can get the most comminuted structure what is a good prognosis for its modification into bio-fuels.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The use of pascalization in the Polish food industry – characteristics and prospects®
Zastosowanie paskalizacji w polskim przemyśle spożywczym – charakterystyka i perspektywy®
Autorzy:: Gruchelski, Marek
Gruchelski, Marcin
Porębska, Katarzyna
Tematy:: pascalization
food processing
food industry
sustainable development
HPP
high pressure processing
high pressure pasteurization
HHP technology
high hydrostatic pressure
UHP
ultra high pressure
paskalizacja
przetwórstwo spożywcze
przemysł spożywczy
rozwój zrównoważony
wysokociśnieniowe utrwalanie żywności
technologia HHP; Pokaż więcej
Wydawca:: Wyższa Szkoła Menedżerska w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/1535993.pdf Link otwiera się w nowym oknie
Opis:: In recent years, pro-health food has become more and more popular. Particular attention is paid not only to unprocessed, nutritional fruit and vegetable products, but also high-quality meat products, dairy products and ready meals. It is the changes in consumer preferences that constitute the main, amongst others, driving force for scientists and food producers who are looking for new concepts and directions to develop the food industry.One of the hi-tech solutions, in line with the principle of “minimal processing”, as well as responding to the market demand, is the method of high-pressure food preservation, often referred to as “pascalization”. The advantage of this method is the combination of effective degradation of microorganisms and pathogens while maintaining the high quality of the pre-served product. Additionally, it allows to influence the texture, functional properties and sensory features of the product wit-hout adversely affecting its nutrients.Modern technologies of food preservation are still rarely used on the domestic food processing market. This is due, inter alia, to the fact that innovations in the production sector require high capital outlays, and individual food processing plants most often do not have a sufficient capital base to invest in modern technologies. The current limitations in the large-scale application of the high-pressure food preservation method in the Polish food processing sector result directly from the high price of high-pressure systems and higher processing costs than contemporary methods.The solution to the problem of currently limited use of these technologies on the Polish market should be sought, first of all, in the approach to the issue of capital cooperation be-tween economic entities and in changing the states policy towards small and medium-sized enterprises.The aim of this article is to present pascalization as an alternative and a modern method of pressure food preservation as well as an indication of the prospects and possibilities of introducing this technology on a large scale in the Polish food processing sector.
W ostatnich latach żywność prozdrowotna cieszy się coraz większą popularnością. Szczególne zainteresowanie budzą nie tylko nieprzetworzone, wartościowe produkty owocowo-warzywne, ale również wysokiej jakości produkty mięsne, nabiał oraz dania gotowe. To właśnie zmiany preferencji konsumentów stanowią główną, choć nie jedyną, przyczynę poszukiwania przez naukowców oraz producentów żywności nowych koncepcji i kierunków rozwoju przemysłu spożywczego. Jednym z nowoczesnych rozwiązań, zgodnych z zasadą „minimalnego przetwarzania”, jak również, odpowiadających na zapotrzebowanie rynku jest metoda wysokociśnieniowego utrwalania żywności, często określana mianem „paskalizacji”. Zaletą tej metody jest połączenie skutecznej degradacji drobnoustrojów oraz patogenów z jednoczesnym zachowa-niem wysokiej jakości utrwalanego produktu. Dodatkowo, pozwala ona wpływać na kształtowanie tekstury, właściwości funkcjonalne oraz cechy sensoryczne produktu bez wywierania negatywnych skutków na jego składniki odżywcze. Nowoczesne technologie utrwalania żywności są jeszcze do-syć rzadko wykorzystywane na rodzimym rynku przetwórstwa spożywczego. Wynika to między innymi z faktu, iż innowacje w sektorze produkcyjnym wymagają wysokich nakładów kapitałowych, a pojedyncze zakłady przetwórstwa spożywczego najczęściej nie posiadają wystarczającej bazy kapitałowej po-zwalającej na inwestycje w nowoczesne technologie. Obecne ograniczenia w zastosowaniu na szeroką skalę metody wysokociśnieniowego utrwalania żywności w polskim sektorze przetwórstwa spożywczego wynikają bezpośrednio z wysokiej ceny systemów wysokociśnieniowych oraz wyższych, względnym metod klasycznych, kosztów przetwarzania. Rozwiązania problemu ograniczonego obecnie wykorzystania tych technologii na polskim rynku należy szukać, przede wszystkim, w sposobie podejścia do kwestii współpracy kapitałowej pomiędzy podmiotami gospodarczymi oraz w zmianie polityki państwa wobec małych i średnich przedsiębiorstw. Celem artykułu jest przedstawienie paskalizacji, jako alternatywnej i nowoczesnej metody ciśnieniowego utrwalania żywności oraz wskazanie perspektyw i możliwości wprowadzenia tej technologii na szeroką skalę w polskim sektorze przetwórstwa spożywczego.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Protection From Steam at High Pressures: Development of a Test Device and Protocol
Autorzy:: Sati, R.
Crown, E. M.
Ackerman, M.
Gonzalez, J.
Dale, D.
Tematy:: steam protection
high pressure steam
protective materials; Pokaż więcej
Wydawca:: Centralny Instytut Ochrony Pracy
Powiązania:: https://bibliotekanauki.pl/articles/90402.pdf Link otwiera się w nowym oknie
Opis:: Extensive use of pressurized steam in the oil and gas sectors has led to incidents where workers were seriously injured. In this study a test device and procedure to measure heat transfer through fabrics during steam exposure were developed and evaluated. Several factors were considered while designing the test device to simulate work site conditions. Fabrics were exposed to steam at 2 distances (50 and 100 mm) and 2 pressures (207 and 69 kPa). Theoretical considerations included heat and mass transfer, and fabric structure and performance properties. The test device and procedure differentiated well among both fabric and exposure conditions. For all fabrics, maximum heat transfer was observed at highest steam pressure and shortest distance. Laminated and coated fabrics performed better than a fabric without such treatments.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Characteristics of the NiAl/Ni3Al Matrix Composite with TiB2 Particles Fabricated by High Pressure - High Temperature Sintering
Autorzy:: Hyjek, P.
Sulima, I.
Jaworska, L.
Tematy:: sintering
High Pressure High Temperature process
metal matrix composites
tribological properties; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352345.pdf Link otwiera się w nowym oknie
Opis:: The article presents the results of tests carried out on the manufactured composite materials based on a two-phase NiAl/Ni₃Al matrix, which was enriched with the addition of TiB₂ ceramic particles added in an amount of 4 and 7 vol%. The resulting mixtures were sintered by the High Pressure High Temperature (HP-HT) process. The results were compared to the results obtained for the sole matrix material produced under the same conditions. It has been shown that, at a lower density, the addition of reinforcing particles increases the composite hardness, Young’s modulus and resistance to frictional wear. However, higher addition of TiB₂ (7 vol%) was observed to yield less satisfactory results, and despite higher hardness and lower density caused a decrease in other properties tested. The produced materials were characterized by a compact and highly differentiated microstructure free from any noticeable cracks and pores.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Positrons in naphthalene : critical remarks on the relation between o-Ps lifetime and void size
Autorzy:: Goworek, T.
Zgardzińska, B.
Wawryszczuk, J.
Tematy:: high pressure
naphthalene
positronium quenching
free volume; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148003.pdf Link otwiera się w nowym oknie
Opis:: Lowering the temperature or applying high pressure leads to elimination of positronium component in the e+ lifetime spectrum in solid naphthalene. Disappearance of positronium means reaching the free volume size limit at which there is no energy level in the potential well. It allows to estimate that size, which is found inconsistent with predictions of the popular Tao-Eldrup model. The range of applicability of that model is discussed. The dependence of the free e+ decay constant on pressure indicates that positronium is formed not only in the blob processes, but during the whole free positron life. The lifetime of free positrons begins to rise with temperature earlier than Ps intensity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The high-pressure sorptomat - a novel apparatus for volumetric sorption studies under isobaric high gas pressure conditions
Autorzy:: Kudasik, Mateusz
Anioł, Łukasz
Skoczylas, Norbert
Tematy:: sorptomat
sorption
high-pressure apparatus
volumetric method; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2173899.pdf Link otwiera się w nowym oknie
Opis:: As part of the work the high-pressure sorptomat - a novel apparatus for sorption tests under conditions of high gas pressure was developed. The sorption measurement is carried out using the volumetric method, and the precise gas flow pressure regulator is used in the device to ensure isobaric conditions and regulate the sorption pressure in the range of 0-10 MPa. The uniqueness and high precision of sorption measurements with the constructed apparatus are ensured by the parallel use of many pressure sensors with a wide measurement range as well as high precision of measurement - due to the use of precise pressure sensors. The obtained results showed, i.a. that the time of reaching the isobaric conditions of the measurement is about 6-7 seconds and it is so short that it can be considered a quasi-step initiation of sorption processes. Moreover, the results of the measurement pressure stabilization tests, during the CO2 sorption test on activated carbon, have shown that the built-in pressure regulator works correctly and ensures isobaric sorption measurement conditions with the precision of pressure stabilization of ±1% of the measurement pressure. The maximum range of sorption measurement using the high-pressure sorptomat is 0-86 400 cm3/g, and the maximum measurement uncertainty is ±2% of the measured value. The activated carbon sample used for the tests was characterized by a high sorption capacity, reaching 104.4 cm3/g at a CO2 pressure of 1.0 MPa.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Examination of High-Pressure Water Jet Usability for High Explosives (HE) Washing Out from Artillery Ammunition
Autorzy:: Borkowski, P.
Borkowski, J.
Woźniak, D.
Maranda, A.
Tematy:: high-pressure water jet
explosive material
artillery ammunition; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/358851.pdf Link otwiera się w nowym oknie
Opis:: The method of explosives materials washing-out process from old artillery ammunition using high-pressure water jet technology was discussed in the paper. Presented experimental results let to define explosives washing-out mechanism and its potential effectiveness. Finally, exemplary structures of washedout explosives pointing on methods of its utilization are presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The effect of 200 MPa pressure on specific surface area of clay
Autorzy:: Koszela-Marek, E.
Tematy:: clay
high pressure
specific surface area
microstructural changes; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178875.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of laboratory studies of the 200 MPa pressure effect on specific surface area of clay. The original high-pressure investigation stand was used for the pressure tests. Determination of the specific surface area was performed by the methylene blue adsorption method. The results of the specific surface area test were compared for non-pressurized clays and for clays pressured in a high-pressure chamber. It was found that the specific surface area of pressurized soil clearly increased. This shows that some microstructural changes take place in the soil skeleton of clays.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Effect of Aluminum Content on the Combustion Performance of HTPB/AP/Al Propellants under High Combustion Pressure
Autorzy:: Han, Jin-chao
Hu, Song-qi
Chu, Cheng-long
Liu, Lin-lin
Tematy:: aluminum
HTPB propellants
propellant surface
high pressure combustion; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/59115401.pdf Link otwiera się w nowym oknie
Opis:: Combustion mechanisms of propellants under high combustion pressure are extremely important for the development of high-pressure solid rocket motors. The combustion characteristics of three HTPB propellants prepared with an aluminum content of 1%, 10%, and 18% were evaluated in this study by analyzing the extinguished propellant surface, the combustion flame, and the temperature profile in the combustion pressure range of 12-30 MPa. The results showed that the burning surface temperature of the three propellants increased from 425 to 535 and to 643 ℃ as the aluminum content was increased from 1% to 18%, resulting in a faster thermal decomposition rate of the binder than the thermal decomposition rate of the AP particles. Consequently, the morphology of the extinguished propellant surface evolved from concave into convex, and the higher the aluminum content, the more obvious became the convex morphology. The combustion flame height of the three propellants showed a downward trend when the combustion pressure was increased from 12 to 18 MPa, enhancing the heat feedback to the burning surface. The burning surface temperature of the three samples increased by 75, 105 and 189 ℃, respectively, with the increase in combustion pressure, resulting in a more distinct degree of concave and convex morphology of the extinguished propellant surface. In addition, this demonstrated that the local heat and mass transfer might play a dominant role under high pressures.
Dostawca treści:: Biblioteka Nauki

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