Materials Literature
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In recent years, diesel exhaust gas aftertreatment has become a core combustion engine research subject because of both increasingly stringent emission regulations and incentives toward more fuel-efficient propulsion systems. Lean NOX traps (LNT) and selective catalytic reduction (SCR) catalysts represent two viable p…
A systematic investigation of all possible isomers of fullerene derivatives C50X2 (X = H, F, Cl, Br, OH) has been performed using the semiempirical AM1 method. The equilibrium geometrical structures, heats of formation, HOMO-LUMO energy gaps, ionization potentials, electronic affinities, strain and aromaticity have be…
Tungsten is a metal widely used for interconnections. As a consequence of more stringent requirements in terms of aspect ratio deriving from device shrinking, the filling of W plugs is becoming more and more critical and new deposition techniques need to be employed to properly fill contacts and trenches. For example…
Neste trabalho foram investigadas as características de amostras de pó de polietileno de ultra alto peso molecular (PEUAPM), tais como porosidade, morfologia, tamanho médio e distribuição de partícula, que são importantes na moldagem por compressão a frio. Também foi avaliada a influência dessas características na den…
Hydrogen desorption properties of woodceramics, made from radiata pine wood fiberboards carbonized at 923 K and 1473 K, hydrogenated at a temperature of 303 K at an initial hydrogen pressure of 4 MPa, were investigated by means of thermal desorption spectroscopy. Hydrogen desorption initiated at temperatures of more t…
Based on mathematical modelling and numerical simulations, the control strategy for a Solid Oxide Fuel Cell Hybrid System (SOFC-HS) is presented. Adequate maps of performances with three independent parameters are shown. These independent parameters are as follows: stack current, fuel mass flow and turbine-compressor…
Inertia friction welding is the process in which stored kinetic energy in a flywheel is converted to heat by relative sliding movement between surfaces of axi-symmetric components to achieve a weld in the solid-state. The work in this paper relates to the production of dual-alloy shafts for aeroengines. Frictional cha…
Mechanochemical redox reactions of manganese dioxide with organic vapors have been studied to control the chemical valence (oxidation number) of manganese ions under grinding. Electrolytic-manganese dioxide (EMD) including double chains of edge-sharing MnO6-octahedra transforms into β-MnO2 (Pyrolusite) consisting of t…
The paper describes calculations of parameters for the uniaxial shock compressed RDX molecular crystal in the crystallographic direction [100] and PETN crystal in directions [100], [110] and [001] performed using a non‐reacting interatomic force field with the help of the Hugoniostat method. For each crystallographic…
A new immunoassay with biotinylated single-walled carbon nanotubes as persistent, non-photobleaching Raman biomarkers demonstrated excellent sensitivity and specificity.
A series of anodic alumina supported silver/titanium catalysts (Ag/Ti/Al2O3) were synthesized to investigate the effect of Ti on the selective catalytic reduction of NO with propene. In the low temperature region, the SCR activity was greatly enhanced on Ag/Ti/Al2O3 compared to Ag/Al2O3, and this promotion became more…
This review summarizes the recent progress of the studies on acetyl CoA synthase (ACS), a metalloenzyme that plays an important role of fixing CO and CO2 in the global carbon cycle. ACS forms a complex with CO dehydrogenase (CODH), in which ACS assembles acetyl CoA from CO, coenzyme A, and a methyl moiety derived from…
Porous carbongel beads supporting Co or Ni were prepared to enhance decomposition of phenol in water with ozone oxidation. The carbongel beads were synthesized by carbonization of resorcinol-formaldehyde (RF) gel beads whose diameter was approximately 1 mm. Co and Ni were supported on carbongel beads by impregnation w…
Piezoquartz microweighing, surface electroconductivity measurements, and IR and Raman spectroscopies were used to study the mechanism and regularities of the interaction of carbon monoxide, ammonia, and oxygen, gases of different electronic natures encountered in the environment and various technological processes, wi…
Low-resistivity ohmic contacts were fabricated on Li-doped, p-type ZnO films using electron-beam evaporation, which were confirmed by the transmission line model technique. The current transport and formation mechanisms of the ohmic contacts were investigated by X-ray photoelectron spectroscopy and temperature-depende…
The ablation of tumoral tissue with High Intensity Focused Ultrasound under MRI control has become clinical practice.[1,2] However, the most common adverse effect is skin burns induced in the near‐field between the transducer and the focal point.[3] We present a study, based on animal trials, with monitoring and quant…
In the last couple of years, the dutch grid operators register many complaints from the customers about flicker related problems. The power quality monitoring (PQM) in the Dutch grid indicates that the average long- term flicker indicator (Plt) in the low voltage (LV) network has an increasing trend. In this paper a t…
Solidified structure near the ingot surface is complex and it is difficult to analyze the crystallographic orientation by the solidified structure. The reason of complexity is that the growth direction of dendrite does not agree with the plane for observation. Thus thick lines called ghost lines are often observed. Th…
In order to grow multi-layer graphene for LSI interconnection at the low temperature without any catalyst, the growth temperature dependence of multi-layer graphene formed by photoelectron-assisted plasma chemical vapor deposition is investigated using microscopic Raman spectroscopy and bulk-sensitive X-ray photoelect…
Pulsed cathodoluminescence of Nd 3+ : Y 2 O 3 nanopowders of the cubic and monoclinic phases and the ceramics synthesized from these nanopowders has been investigated in the spectral range 350–850 nm. It is found that the IR emission band of neodymium ions in the Nd 3+ : Y 2 O 3 cubic phase is located at λ 1 ≈ 825 nm.…