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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 201 for “"400°C"”.
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Cás-staidéir ar logainmneachaibh agus ar threabhainmneachaibh dar tús ‘L’ ó fhoinsíbh Gaoluinne agus Laidine idir c.400-c.1800 A.D.
… Laidin na hÉireann a bhaineann leis an dtréimhse 400-1800. Do bhailíos na hainmneacha so agus dheineas anailís ortha le linn mo thréimhse oibre leis an dTionscnamh Locus. Is é cuspóir an tionscnaimh so foclóir áitainmnaíoch is treabhainmníoch a chur ar fáil ar a dtugtar, Historical Dictionary of …
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Víceprvkové systémy biomateriálů na bázi hořčíku a zinku
… částic Zn lisováním za tepla při teplotě 300 a 400 °C za tlaku 100, 200, 300, 400 a 500 MPa. Binární směsi na bázi Mg s přídavkem Zn nebo Ca byly připraveny lisováním za tepla v pevné fázi (300 °C) a lisováním za tepla částečně v tavenině (400 °C, 450 °C v případě Mg- Ca systém) při tlaku 500 …
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PVD COATING TREATMENT TOWARDS A SUSTAINABLE AND ECO-FRIENDLY MANUFACTURING SYSTEM
… substrate temperature from room temperature to 400 °C significantly improved crystallinity, reduced lattice strain, and promoted preferred grain orientation. SEM and 3D profilometry revealed that higher deposition temperature produced smoother and denser films, reducing surface roughness by up …
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Characterization of Boron Nitride Thin Films on Silicon (100) Wafer.
… Results indicated that samples deposited at 400°C contained higher cubic phase of BN compared to those films deposited at room temperature. A BN film containing cubic phase deposited at 400°C for 2 hours showed 0.1 friction coefficient.
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Synthesis and characterisation of Titania thin films
… using ultrasonic spray pyrolysis for 1 h at 300°-400°C. At 300°C, the films were amorphous; higher temperatures gave films of anatase. With increasing film thickness, the optical transmission decreased. The indirect optical band gap decreased with increasing deposition temperature, dropping from …
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Optical studies of GaAs:C grown at low temperature and of localized vibrations in normal GaAs:C
… in LT-GaAs:C films grown at temperatures below 400 °C, nonradiative recombination processes dominate and photoluminescence is quenched. When the growth temperature exceeds 400 °C, band-to-band photoluminescence emission appears. We conclude that the films change in character from LT-GaAs:C to …
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The effect of microstructure on the fracture toughness of a high strength steel
… grain 1200°C material was tempered in the 300-400°C tempered martensite embrittlement range. The fine grain 850°C material also exhibited a drop in toughness in the 300-400°C tempering range but in this case the fracture mode was mainly transgranular cleavage. Transgranular cleavage fracture …
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High temperature annealing for structural optimization of silica aerogels in solar thermal applications
… for 1 hour at various temperatures ranging from 400-1000 °C. The time-dependent studies used samples made from two silica aerogel chemistries and were annealed at two temperatures (400 °C and 600 °C). In general, lower temperatures and times have less overall change (slower change rates) than …
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High-pressure X-ray photoelectron spectroscopy applied to vanadium phosphorus oxide catalysts under reaction conditions
… MA bei einer Reaktionstemperatur von 400°C und hatten während des Experimentes eine vergleichbare katalytische Aktivität normalisiert auf die Oberfläche. XP-Spektren, mit den Photonen-Energien entsprechend einer Eindringtiefe von 1.0 und 1.8 nm, wurden gemessen. Eine Probe zeigte keine …
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The oxidation kinetics of liquid lead and lead alloys
… follow a cubic rate of oxidation between 350 and 400°C. A parabolic rate was found at temperatures above 400°C. 0.496% silver and 2.258% silver alloys followed a cubic rate of oxidation from 350 to 550°C and tended to approach a parabolic rate of oxidation above this temperature. Silver additions …
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High performance MoS₂ transistors based on wafer-scale low-temperature MOCVD synthesis
… thin film with BEOL compatible temperature (<400°C) and good uniformity has always been difficult to realize. To achieve low contact resistance to these materials is also very challenging and hinders the development of 2D material devices and circuits. In this thesis, we will demonstrate a …
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Synthesis and characterization of novel bismaleimides derived from arylene phosphine oxides and ether-ketones
… which exhibited glass temperatures around 380-400°C by DMTA and TMA. The phosphine oxide bismaleimides demonstrated an exothermic curing peaks >180°C, suggesting that a practical processing range exists. Qualitatively the networks show excellent flame resistance compared to commercial controls. …
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Catalytic activation of Rh,Pd nanoclusters supported on Ceria
… stability for ethanol steam reforming (ESR) at 400°C. This thesis encompasses experimental and computational investigations of this nanocatalyst. The activation mechanism of Rh,Pd/CeO2 nanocatalysts under ethanol steam reforming conditions is unclear, though it has been previously suggested that …
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The hardening of Type 316L stainless steel welds with thermal aging
… was welded and aged at temperatures of 300-400*C for 1,000 - 40,000 hours. The properties of the material were examined using several techniques, including Vickers hardness testing, to evaluate the evolution of hardness of the material, Charpy V-notch testing, to measure the evolution of …
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High-K Dielectrics in Metal Insulator Metal (MIM) Capacitors for RF Applications
… by atomic layer deposition (ALD) at 200 and 400 ?C were characterized for the first time. The MIM capacitor with 4 nm ALD SiO<sub>2</sub> deposited at 400 ?C achieved a low leakage current of 2?10<sup>-7</sup> A/cm<sup>2</sup> at 3.3 V, a high field strength of 19 MV/cm, and a high operation …
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Influence of preparation techniques on the Fischer-Tropsch performance of supported cobalt catalysts
… that are not reduced at temperatures below 400°C.
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Testování lomové houževnatosti za vysokých teplot s využitím miniaturních CT těles
… analýzou prokázaly pokles houževnatosti při 400°C zapříčiněný efektem dynamického stárnutí.
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Kinetik der CpCo-katalysierten Cyclotrimerisierung von Phenylacetylen in überkritischen Fluiden
… in SCW durchgeführt. Die Reaktion verlief bei 400°C und 400 bar so schnell, dass nach 1 min Reaktionszeit kein Phenylacetylen mehr nachgewiesen werden konnte. Basierend auf den erhaltenen Daten von Messungen in scCO2, sollte die Zeitkonstante bei 400°C etwa 300 s-1 betragen.
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Chemically activated carbon using peat soil for heavy metals adsorption in industrial wastewater
… studied. From this study, peat soil heated at 400℃ possess the highest carbon content with concentration of 95.44 % due to the complete degradation of organic matter. The thermogravimetric analysis (TGA) and its derivative thermogravimetric (DTG) confirm the finding where at temperature ≈400°C, …
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