Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"thermal growth"”.
-
Tensile Stress and Thermal Growth Effects on Grain Boundary Motion in Nanocrystalline Nickel
… surface specimens. The second study examines thermal effects of various annealing temperatures on grain boundary motion in 5 nm3 periodic nc-Ni specimens. It is found that grain growth exhibits a linear relationship with time, as opposed to parabolic grain growth observed in bulk metals. …
-
Clearance management in twin screw compressors
… and casing distortion resulting from dependant thermal effects. This has been achieved by the use of surface boundary mapping to calculate the rotor and casing temperature exposure within the compression chamber resulting from initial performance estimates. These detailed temperature …
-
Environmental controls in the seasonal succession and synchronization of development in some pond species of damselflies (Odonata: Zygoptera)
… penultimate and final instars, by differences in thermal growth coefficients in different instars during spring development, and by a threshold temperature for emergence higher than that for nymphal development. Members of the second group overwinter as eggs in late stages of embryonic …
-
Geographical assessment of algal productivity and water intensity across the United States
… of algae biomass through a dynamic integrated thermal and biological modeling framework. Water demands were calculated through a validated dynamic thermal model which predicts temperature with an accuracy of -0.96 ± 2.72 °C and evaporation losses with a 1.46 ± 5.92 % annual accuracy. The …
-
Laser-assisted metalorganic chemical vapor deposition of zinc selenide
… minimizing disturbances to the gas flow in the growth region. The temperature dependence for both thermal and laser-assisted film growth was examined, keeping other reaction parameters fixed. The laser-assisted growth rate of ZnSe remained approximately constant at 1 $\mu$m/h over the …
-
Photosensitivity and Photodarkening of UV-induced Phosphate Glass Fiber Bragg Gratings and Application in Short Fiber Lasers
… nm ArF excimer laser light through a phase mask. Thermal annealing experiment results demonstrate that a thermal growth of grating reflectivity of an FBG in phosphate fiber can be obtained upon heating it at temperatures between 100 – 250 °C. A recipe that can reliably obtain strong FBGs with …
-
An experimental study on the effects of blade row interactions on aerodynamic loss mechanisms in a multistage compressor
… temperature changes to affect clearances due to thermal growth, measurements of small performance changes in detailed research studies could be indiscernible. ^ The methodology and implementation of a powder-paint flow visualization technique along with the illuminated flow physics are presented …
-
Titania Nanowires: synthesis, characterization and properties.
… of titanium dioxide nanowires by seed assisted thermal growth in the temperature range between 600-1000 °C. In order to improve the photocatalytic performances of TiO2 NWs, we modified the samples applying two approach: doping by ion implantation of Fe+ and annealing in forming gas. It was found …
-
Synthesis, Processing And Characterization Of Nanocrystalline Titanium Dioxide
… Differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) were used to study the thermal properties. As-synthesized powder was uniaxially compacted and sintered at elevated temperature of 1100-1600oC to investigate the effects of sintering on nano powder particles, …
-
Sintesi, caratterizzazione e proprietà fotocatalitiche di materiali a base di biossido di titanio
… sintesi dei NWs di TiO2 tramite seed-assisted thermal growth. Questo studio coinvolge la variazione della temperatura, la durata dell'annealing, il contenuto di gas e il flusso durante l'annealing al fine di determinare le condizioni di processo ottimali per la produzione di NWs con …