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.
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Showing 1 to 20 of 29 for “"Esca"”.
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Sistema de detección de plagas basado en visión computacional para los cultivos de vid de la zona sur del Perú
… 47% y Piura el 36%. Sin embargo, plagas como la Esca y la Spodoptera frugiperda representan una gran amenaza para los cultivos vitivinícolas de estas regiones, ya que generan entre otros, bayas más pequeñas, destrucción de las yemas, retraso del crecimiento, plagas secundarias, hasta la muerte de …
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Adsorption of hydrogen chloride on microcrystalline silica
… including adsorption/readsorption isotherms, ESCA, and calorimetry. Adsorption of hydrogen chloride at 30°C was found to be dependent on the outgas temperatures and reversibility was dependent on the reoutgas temperatures. ESCA analysis on silica after exposure to HCl. indicated the presence …
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Analysis of residual stresses in laser trimmed alumina microelectronic substrates
… and electron spectroscopy for chemical analysis (ESCA). The results from these characterization steps gave results for fractography (optical), surface and bulk composition (SEM/EDAX), chemical composition (ESCA) and phase analysis (EPMA). Results show that laser trimming produces stress gradients …
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The effect of moisture exposure on pretreated aluminum alloys
… before and after exposure to moisture were ESCA or XPS, AES, high resolution SEM, and specular reflectance FTIR. There was a change in the surface topography on exposure of the aluminum surfaces to water as determined using high resolution SEM. Stoichiometric calculations based on XPS …
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Surface modification of titanium dioxide and synthesis of non- electroactive coatings by electrochemical polymerization
… Then the modified surface was studied using ESCA. These electrodes were subsequently subjected to photoelectrochemical conditions (photocurrent generation) and were reexamined using ESCA in order to evaluate the stability of the modified layer. A reaction scheme which was devised to induce …
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Synthesis and characterization of polycarbonate-polydimethylsiloxane block copolymers
… by X-ray photoelectron spectroscopy (known as ESCA) indicates preferential surface migration of the siloxane component in all cases studied. In addition, preliminary ESCA studies of blends of these materials with a commercial polycarbonate homopolymer show siloxane on the surface even when bulk …
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The role of surfaces in reprography: the study of toner fixing
… 23 to 38 dyne/cm. This result was supported by ESCA data showing a clear difference in surface chemical composition of nitrogen between the high and low surface tension components of the toner. The broad range of toner surface tension could be one of the causes of the non-uniform fixing states. …
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A study of chlorinated polymer coatings in a fretting interface
… and greater than 95 percent relative humidity. ESCA analysis is used to determine interface chemistry and help conclude that the color formation observed in the polymer coating is due to polymer degradation. Additional tests of thermally stabilized PVC on a steel plate supported this theory and …
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THE DURABILITY OF PHENOLIC ADHESIVES
… of Electron Spectroscopy for Chemical Analysis (ESCA) was employed. Examination by ESCA revealed that, in many instances, the mode of failure was complicated and also. In some cases, contrary to the visual evidence. To complete the surface study, the phenolic adhesive aluminium inter-face was …
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Synthesis and characterization of polydimethylsiloxane-urea segmented copolymers
… (-NCO) groups are less prevalent in BLO. ESCA was used to probe the surface chemical composition of polyether-urethane (Estane C-5), polydimethylsiloxane-urethane (PUS) copolymers and their blends. The topmost surface of the neat Estane is mostly covered with the polyether (PTMO) soft …
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Extreme ultraviolet response of ionic crystals
… binding method of Slater and Koster. Available ESCA data was used to position the conduction band minimum with respect to the onset of absorption. The resulting conduction band density of states was then compared with the first spin-orbit component of the rubidium 3d level and the chlorine 2p …
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Χημική δομή και μεσοφασικές δράσεις τεσσάρων σιλανιούχων σκευασμάτων επιδιόρθωσης κεραμικών όψεων
… layers. IV) x-ray photelectron spectroscopic (ESCA) investigation of the alloys treated with a thin silane layer from each silane product. The ESCA analyses were conducted on a small area mode. Depth profiling was performed to investigate the uppermost 20 Â layer at 10 Â intervals. According to …
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Effect of network structure on lignin-derived polyurethane film properties
… by Electron Spectroscopy for Chemical Analysis (ESCA) revealed the formation of interfacial bonds on the surface of the cellulose acetate adherend. Furthermore, it was indicated that failure occurred well within the bulk of the cellulose acetate while interfacial failure was apparent for the …
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Investigation of factors affecting the sticking of insects on aircraft wing surfaces
… electron spectroscopy for chemical analysis (ESCA) and contact angle measurements of uncoated and polymer-coated aluminum surfaces have been performed. An air-gun was designed to accelerate insects to high speeds and impact them onto modified wing surfaces in a laboratory environment. A direct …
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Beschichtung von textilen Flächen mit den PVD-Technologien reaktives Vakuumbogen-Verdampfen und reaktives Magnetron-Sputtern : PVD-Beschichtung von textilen Flächen
… Zusammensetzungen der Schichten mittels ESCA (Electron Spectroscopy for Chemical Analysis), - der Schichtstrukturen und Fasermorphologien mittels Rasterelektronenmikroskopie, - der E-Moduln an Referenzprobekörpern aus Edelstahl mittels Härtemessung, - der Schichthaftungen durch …
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Epac-mediated modulation of neurotransmitter release from cultured hippocampal neurons
… Epac-selektiver cylischer AMP Analoga (ESCAs). Bei niedrigfrequenter Stimulation (0.2 Hz) von autaptischen Neuronen des Dentatus Gyrus führte eine ESCA-induzierte Epac Aktivierung sowohl zur Erhöhung Aktionspotential evozierter exzitatorischer postsynaptischer Stromamplituden als auch …
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Sizing and characterization of carbon fibers with aqueous water-dispersible polymeric interphases
… sizing level on the carbon fiber. SEM and ESCA were utilized to determine fiber clumping and sizing homogeneity. The sizing process along with the statistical process model and the characterization techniques allow for the precise development of optimal interphase materials that are …
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Evaluation of fiber-matrix interfacial shear strength in fiber reinforced plastics
… microscopy (SEM) and spectroscopy (XPS or ESCA) and mass spectroscopy (SIMS). When the single fiber specimens were unloaded, a residual birefringent zone was measured and correlated with composite properties, as well as with SIMS and SEM analysis that identified changes in the locus of …
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Electromigration and chemical diffusion in titanium carbide
… is consistent with qualitative results of recent ESCA and electron mapping experiments that show that the carbon atom is negative at its equilibrium site. The chemical diffusivity in single crystals of titanium carbide was determined for 19200 C ~ T ~ 2328°C using the Boltzmann-Matano method of …
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