Ceramic/metal nanocomposites by lyophilization: Processing and HRTEM study

5 páginas, 8 figuras, 1 tabla.-- El pdf del artículo es el manuscrito de autor.This work describes a wet-processing route based on spray-freezing and subsequent lyophilization designed to obtain nanostructured ceramic/metal powders. Starting from the ceramic powder and the corresponding metal salt, a water-based suspension is sprayed on liquid nitrogen. The frozen powders are subsequently freeze-dried, calcined and reduced. The material was analyzed using X-ray diffraction analysis at all stages. High resolution transmission electron microscopy studies showed a uniform distribution of metal nanoparticles on the ceramic grain surfaces, good interfaces and high crystallinity, with an average metal particle size in the nanometric range.This work was supported by the Spanish Ministry of Science and Innovation (MICINN) under the project MAT2009-14542-C02 and the Government of the Principality of Asturias through PCTI and ERDF (European Regional Development Fund) 2007-2013 under project PC10-65. C.F. Gutierrez- Gonzalez acknowledges CSIC and ESF for the concession of a JAE-Doc 2009 grant. S. Agouram thanks the Spanish Ministry of Science and European Social Fund for financial support.Peer reviewe

Реалізація цифрової системи автоматичного керування безперервним об'єктом, на основі фізичної моделі теплового об'єкта з використанням scada системи ZENON

У статті наведена методика поетапної реалізації системи цифрового керування безперервним об'єктом, реалізованої на персональному комп'ютері, що дозволила максимально наблизити модель до реальної системи керування й виконати ефективне тестування її функціонування в невиробничих умовах

Absolute density of the argon first excited states in plasmas used for carbon deposition as determined by absorption spectroscopy Citation for published version (APA)

Absolute density of the argon first excited states in plasmas used for carbon deposition as determined by absorption spectroscopy Abstract In order to study the possible excitation transfer from argon metastables to the admixed species in an expanding cascaded arc plasma the densities of the Ar( 3p54s) states in a deposition plasma were studied with absorption spectroscopy. For a purely argon plasma the Ar(3p54s) density lies in the range 10'6-10'8 me3 at a chamber pressure of 40 Pa. The effect on the densities of the addition of moderate amounts of methane and oxygen is small. The addition of hydrogen to the argon plasma leads to a rapid disappearance of the argon 4s states. Possible explanations are a lowering of the argon ion density by dissociative recombination and the direct excitation energy transfer with the H* (n=2, 3) levels