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Wyszukujesz frazę "high temperature" wg kryterium: Wszystkie pola


Tytuł:
Arabidopsis high temperature stress research
Autorzy:
Dolzblasz, A.
Dolzblasz, S.
Powiązania:
https://bibliotekanauki.pl/articles/58839.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
The rise in global temperature and increasingly frequent heat waves may severely disturb plant growth and productivity. Throughout the life cycle of vascular plants, which may last even thousands of years, various aboveground structures are constructed due to the activity of the shoot apical meristem (SAM). A pool of dividing, undifferentiated stem cells is maintained within a SAM, which facilitates self-perpetuation of the meristem and provides cells for growth and organogenesis. Unsurprisingly, there has been a growing interest to study the impact of increased temperatures on the development and molecular response of the model plant Arabidopsis thaliana. Unfortunately, the experimental setups are highly variable and key aspects of plant development are regularly neglected. Thus, in this short review, we highlight the experimental variables and address SAM maintenance in the context of elevated temperature research.
Źródło:
Acta Societatis Botanicorum Poloniae; 2018, 87, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
XANES Experiments for High-Temperature Superconductors
Autorzy:
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1920888.pdf
Data publikacji:
1992-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.-b
76.30.-v
Opis:
The paper presents the results of XANES (X-ray Absorption Near Edge Structure) experiments, of the high-temperature superconductors of Y-Ba-Cu-O-type carried out at the Cu L$\text{}_{II,III}$- and O K$\text{}_{I}$-edges using synchrotron radiation and the KMC double monochromator and SX-700 grading monochromator beamlines of BESSY/Berlin synchrotron storage ring. The aim of the paper is to show that the XANES studies are well suited for characterization of the local electronic structure of the high-temperature superconductors.
Źródło:
Acta Physica Polonica A; 1992, 82, 2; 273-281
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behaviour of cement concrete at high temperature
Autorzy:
Hager, I.
Powiązania:
https://bibliotekanauki.pl/articles/201988.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
concrete
high temperature
fire damage
thermal strain
transient thermal strain
hot tested mechanical properties
residual properties
Opis:
The paper presents the impact of high temperature on cement concrete. The presented data have been selected both from the author’s most recent research and the published literature in order to provide a brief outline of the subject. The effect of a high temperature on concrete covers changes taking place in cement paste, aggregates, as well as the interaction of these two constituents, that result in changes of mechanical and physical characteristics of concrete. This paper presents the effects of a high temperature on selected physical properties of concrete, including colour change, thermal strain, thermal strains under load, and transient thermal strains. In addition, changes to mechanical properties are discussed: stress-strain relationship, compressive strength, and modulus of elasticity. Moreover, the phenomenon of explosive spalling and the main factors that affect its extent are analysed in light of the most recent research.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 145-154
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pseudogap and Vortices in High-Temperature Superconductors
Autorzy:
Maśka, M.
Mierzejewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2038384.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.25.Op
74.20.-z
Opis:
The origin of the pseudogap is one of the most puzzling features of the high-temperature superconductors. There are two main scenarios: the first one assumes the presence of a hidden order competing or coexisting with superconductivity; within the framework of the second one the pseudogap is a precursor of the superconducting gap. In this paper we present some aspects of the hidden order pseudogap scenario. In particular, we discuss how the competing order modifies the structure of vortices in high-temperature superconductors. We demonstrate that the presence of the hidden order can explain some features of vortices observed in scanning tunneling microscopy experiments.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 569-574
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation of pentachlorophenol by high temperature hydrolysis
Autorzy:
Janas, Monika
Zawadzka, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/106053.pdf
Data publikacji:
2019
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
pentachlorophenol
thermohydrolysis
supercritical water
neutralization
pentachlorofenol
termohydroliza
woda nadkrytyczna
neutralizacja
Opis:
The long-term use of plant protection products in agriculture, including pentachlorophenol (PCP), has contributed to their widespread distribution in the natural environment. So far, no cheap and effective techniques for removing chlorophenols by physicochemical or biological methods have been developed. Therefore, alternative methods of neutralizing them are currently being sought. The aim of the study was to investigate the possibility of pentachlorophenol decomposition by high temperature thermohydrolysis. The decomposition process was carried out at a constant pressure of 25 MPa, in the temperature range of 20°C to 500°C and at various volumetric flows of PCP through the reactor. Detailed analysis of the results showed that the process and degree of pentachlorophenol reduction depended on residence time in the reactor and the process temperature. The obtained results indicate that thermohydrolysis in supercritical water is not an effective method to neutralize pentachlorophenol. The high costs of conducting this process together with an average degree of PCP conversion (the conversion of pentachlorophenol at the lowest volumetric flow rate through the reactor reached about 45%) cause that thermohydrolysis at high temperature is not a costeffective method of neutralizing pentachlorophenol.
Źródło:
Acta Innovations; 2019, 31; 64-70
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High temperature resistance of silicide-coated niobium
Autorzy:
Szklarek, Radosław
Tański, Tomasz
Mendala, Bogusław
Staszuk, Marcin
Krzemiński, Łukasz
Nuckowski, Paweł
Sobczak, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2086896.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
niobium
silicide
thermal barrier coating
CVD
high-temperature oxidation resistance
niob
krzemek
powłoka termoizolacyjna
odporność na utlenianie w wysokiej temperaturze
Opis:
In this paper, thermal oxidation resistance of silicide-coated niobium substrates was tested in a temperature range of 1300–1450°C using an HVOF burner. Pure niobium specimens were coated using the pack cementation CVD method. Three different silicide thickness coatings were deposited. Thermal oxidation resistance of the coated niobium substrates was tested in a temperature range of 1300–1450°C using an HVOF burner. All samples that passed the test showed their ability to stabilize the temperature over a time of 30 s during the thermal test. The rise time of substrate temperature takes about 10 s, following which it keeps constant values. In order to assess the quality of the Nb-Si coatings before and after the thermal test, light microscopy, scanning electron microscopy (SEM) along with chemical analysis (EDS), X-ray diffraction XRD and Vickers hardness test investigation were performed. Results confirmed the presence of substrate Nb compounds as well as Si addition. The oxygen compounds are a result of high temperature intense oxidizing environment that causes the generation of SiO phase in the form of quartz and cristobalite during thermal testing. Except for one specimen, all substrate surfaces pass the high temperature oxidation test with no damages.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137416, 1--8
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-temperature carbothermal dephosphorization of Malaysian monazite
Autorzy:
Udayakumar, Sanjith
Sheikh Abdul Hamid, Sheikh Abdul Rezan
Baharun, Norlia
Pownceby, Mark
Powiązania:
https://bibliotekanauki.pl/articles/2146886.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
malaysian monazite concentrate
dephosphorization
carbothermal reduction
rare earth elements
graphite
Opis:
High-temperature carbothermal reduction experiments with graphite powder were conducted to assess the dephosphorization behavior of Malaysian monazite concentrate. Thermodynamic analysis of the possible dephosphorization reactions was conducted to evaluate the feasibility of the carbothermal reduction of the monazite phases. The effects of temperature, particle size, and monazite to carbon ratio were then investigated under different conditions. The carbothermal reduction experiments were conducted based on the Taguchi design method, and up to 97% of phosphorous removal was achieved under optimized conditions. The optimal conditions for dephosphorization were determined as; a reduction temperature of 1350 °C, a particle size of -75 μm, and monazite to carbon molar ratio of 0.3. Microstructural and phase characterization of the dephosphorized products revealed that CeO2, Nd2O3, La2O3, and Pr2O3 oxide phases were prominent, and no residual peaks of monazite remained in the reduced products. The information gained from the study can aid in the design of a suitable post-dephosphorization hydrometallurgical treatment for exploiting Malaysian monazite as a local source of REEs.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 6; 140--155
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stripes and Pairing in High Temperature Superconductors
Autorzy:
Oleś, Andrzej M.
Powiązania:
https://bibliotekanauki.pl/articles/1431206.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.30.Et
03.67.Mn
61.50.Ks
Opis:
We review briefly several approaches used to investigate the stability of stripe phases in high temperature superconductors, where charge inhomogeneities arise from competing kinetic and magnetic energies. The mechanism of stripe formation, their consequences for the normal state and enhancement of pairing interaction triggered by charge inhomogeneities are briefly summarized. Finally, we demonstrate that orbital degeneracy (i) leads to a more subtle mechanism of stripe formation, and (ii) plays an important role and determines the symmetry of the superconducting state in pnictides.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 752-758
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convective drying of wood chips at high temperature
Autorzy:
Boszko, M.
Malczewski, J.
Grabarczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/335486.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
suszenie konwekcyjne
wióry drewniane
wysoka temperatura
convective drying
wood chips
high temperature
Opis:
Drying of wood chips of the average size 15x5x2 mm and the initial moisture content 50% w.b. was experimentally studied. The drying medium was hot air at the inlet temperature of 500°C, that is well above the ignition temperature of dry wood (approx. 300°C). The experiments were carried out in an electrically heated stove equipped with a device to mix and move wood chips samples. No significant change in the surface colour of wood chips was observed. Drawing conclusions from the experimental result, industrial - scale drying of wood chips in a rotary dryers or similar ones at 500°C inlet temperature of drying air can be envisaged.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2007, 52, 2; 61-62
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High temperature-regulated expression of microRNAs in barley
Autorzy:
Kruszka, K.
Swida-Barteczka, A.
Pacak, A.
Karlowski, W.
Jarmolowski, A.
Szweykowska-Kulinska, Z.
Powiązania:
https://bibliotekanauki.pl/articles/80830.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
small RNA
microRNA
gene expression
high temperature
barley
biogenesis
stress condition
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł

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