The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An experimental study of the filtration dewatering of fine coal focusing on particle characteristics was carried out. The dewatering behavior was determined by filtration velocity, moisture content and resistance of cake using a vacuum filtration cell. The suitable filtration conditions were explored, the particle grain sizes were tested and filter cake structures were modulated, and the optimum structure...
The effects of Cu doping and annealing process on crystal structure and resistive switching (RS) characteristics of HfO 2 films fabricated by RF magnetron sputtering were investigated. The chemical compositions of the films were characterized by X-ray photoelectron spectroscopy. The defects induced by Cu dopants played an important role on the RS characteristics. The enhanced ON/OFF ratio...
The properties of Ti–6Al–7Nb alloy oxidation in the temperature range from 500 to 800 °C, in various time periods between 20 min and 72 h, were examined. The rate of oxidation at temperatures of 600, 700 and 800 °C, determined on the basis of the weight gain, was described by a parabolic equation. The obtained oxidation activation energy value was 170 kJ/mol. In addition to oxidation kinetics, the...
Serial co-sputtering is an extension of conventional magnetron sputtering: it utilizes cylindrical primary rotating sputter sources within a metallic or reactive sputtering process. With one or more auxiliary sputter sources the surface of the primary sputter target is simultaneously coated with additional elements. In the primary sputtering process, these elements get implanted and mixed into the...
An ambient pressure synthesis of potassium tris(carbonato)dioxouranium(VI), K 4 UO 2 (CO 3 ) 3, is reported in which a hydrolyzed uranyl salt (the first report of reacting a non-stoichiometric uranium mixture starting material to form the title compound) is reacted with potassium carbonate at ambient pressure to produce pure, high quality, large crystals of the title...
Amorphous Ni 53 Nb 20 Ti 10 Zr 8 Co 6 Ta 3 powders were successfully fabricated by mechanical alloying. The glass-forming ability and crystallization behavior of the synthesized alloy powders were investigated by X-ray diffraction, transmission electron microscopy and differential scanning calorimetry. The non-isothermal crystallization kinetics were...
Vacuum leak is a critical issue for all devices having vacuum system, especially for the large complex experimental facilities. They often have vacuum components integrated which are inaccessible once the assembly was finished. Therefore, if any unacceptable vacuum leaks occur on the cooling/baking channels of the vacuum components, the machine, at least partially, needs to be disassembled before...
Pure Cu–Ti 3 SiC 2 composites, with 1, 3, 10, 15 and 25 wt.% of Ti 3 SiC 2 , were prepared by means of powder metallurgy method. Erosion behavior of the composites under vacuum arc was investigated. The eroded surfaces and the phase constituent of the eroded composite were revealed by scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy...
This contribution reports on novel physical properties of specific oxides in their nano scaled configuration. This includes the ultrafast optical limiting of VO 2 thin films, the magneto-optical tunability of the ESR response of α-Cr 2 O 3 nano-spheres, and the reversible control of the surface tension of ZnO oriented nano-rods as well as the validation of the synthesis of...
To realize the automatic quantitative control of liquid absorption, a jet pump working under operating limits is proposed and investigated. Experimental results show that the absorption amount keeps constant and is independent of the outlet pressure at the jet pump operating limits. There is an obvious interface wave in the jet pump, and the reason why the upstream pressures have not changed is because...
Au/CeO x /Si system was prepared by a combination of physical and chemical methods for application in the heterogeneous catalysis. Gold nanoparticles were loaded by the deposition-precipitation method (HAuCl 4 ∙4H 2 O used as a precursor) onto radio frequency magnetron sputtered layers of cerium oxide. The study focuses on the influence of the experimental parameters (pH of...
Cu–Cr–O thin films were co-sputtered from metallic Cu and Cr targets in the presence of a reactive argon–oxygen gas mixture. Evolution of the coatings composition as a function of the discharge current dissipated on each target allowed to obtain convenient composition. The films deposited at ambient temperature (without intentional heating of substrate) were initially amorphous and need to be annealed...
The effect of vacuum and ultrasonic co-assisted electroless copper plating on the inner pore surface of mesophase pitch-based carbon foam with an average porosity of 70% was investigated. It has been found that a uniform and compact coating was attained on the surface and the inner wall of foam cells by vacuum and ultrasonic co-assisted chemical plating. The plating rates under intermittent ultrasonic...
High-power impulse magnetron sputtering with a pulsed reactive gas (oxygen) flow control was used for high-rate reactive depositions of densified, highly optically transparent, stoichiometric ZrO 2 films onto floating substrates. The depositions were performed using a strongly unbalanced magnetron with a directly water-cooled planar Zr target of 100 mm diameter in argon–oxygen gas mixtures...
The inert gas condensation (IGC) process was modified to synthesize and directly deposit thin films of homogeneously sized NanoParticles (NPs) over a large surface area. We replaced the single 2 mm hole that is used to extract the nanoparticle beam with a multiple-hole pattern consisting of 25 holes, each 0.31 mm in diameter, arranged as a 5 × 5 array. The resultant deposition covered a larger substrate...
Transparent and conductive Ga-doped ZnO (GZO) thin films were deposited by ultrasonic spray pyrolysis of film-forming solutions (FFS) on silicon and glass. The effect of Ga concentration in the FFS in the range Ga/Zn = 0–15 at% was systematically investigated to obtain GZO films suitable for application in c-Si solar cells. Films of ∼400 nm in thickness deposited under optimized conditions (Ga/Zn = 5–6 at%)...
Nanocrystalline lead selenide (PbSe) thin films with varied thickness were deposited on glass substrates by thermal evaporation technique. Physical and surface properties of PbSe films were examined by XRD, AFM, UV–Vis spectra. It was found that the structural and optical properties of the PbSe films were strongly dependent on thickness. On one hand, the particles were uniformly distributed in the...
Doping of titania with metal and non-metal elements provides a simple and efficient pathway to significant enhancement of photocatalytic properties. In this work titania thin films co-doped with molybdenum and nitrogen were prepared by reactive magnetron sputtering. Additionally, coatings doped only with nitrogen were prepared under identical deposition conditions for comparison purposes. Coatings...
WO 3 nanotubes are fabricated by a facile solvothermal method using WCl 6 as the tungsten source. Morphology and structure of the WO 3 nanotubes are analyzed by SEM, XRD, XPS and N 2 sorption technique. Gas sensing properties of the as-prepared WO 3 sensor are systematically investigated by a static gas-sensing system. The results show the triclinic-structure...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.