The deep levels present in semiconducting CdTe and semi-insulating CdTe:Cl Cd0.8Zn0.2Te have been investigated by means of cathodoluminescence, level transient spectroscopy (DLTS), photo-induced current spectroscopy, photo-DLTS. latter two methods, which can be applied to materials, allow characterize the traps located up midgap determine whether they are hole or electron traps. We identified 12 different traps, some common all samples, peculiar one them. A comparison results obtained from...

In this Letter, we report on the successful fabrication of low loss, high refractive index contrast waveguides via ion migration upon femtosecond laser writing in phosphate glass. Waveguides were produced two different glass compositions with and La(2)O(3) content. La-rich glass, a large increase guiding region was observed due to incoming La accompanied by out-diffusion K. The much smaller change La-less is caused rearrangements structure. These results confirm feasibility adapting...

The slag from the extraction processes of metals their ores may contain valuable components that, if adequately recovered, can be reintroduced in technological life cycle. This is case for material obtained Penouta mines North Spain. These mineral sites are a main source tin cassiterite. submitted to pyrometallurgical process separate tin, however cassiterite not only present veins, and large amounts other minerals normally discarded, constituting slag. In case, besides cassiterite, one most...

This paper describes the physicochemical study of adsorption dysprosium (Dy3+) in aqueous solution onto two types activated carbons synthesized from spent coffee ground. Potassium hydroxide (KOH)-activated carbon is a microporous material with specific Brunauer-Emmett-Teller (BET) surface area 2330 m2·g-1 and pores diameter 3.2 nm. Carbon water vapor N2 solid mesoporous, 5.7 nm 982 m2·g-1. A significant dependence capacity on pH was found, but it does not significantly depend concentration...

Common formulation batters were prepared by pork meat comminution and processed for 30 min pressure/thermal combinations of 200 400 MPa with five temperatures from 10 to 70 °C. Processing performance was monitored determination pH, cooking loss, three textural parameters assess the quality pressurized versus unpressurized samples. Protein thermal denaturation determined differential scanning calorimetry evaluate unfolding effects processing. Net pressure−temperature interdependent, pressure...

We report on a strong cross migration of ions in Tellurite (Te) based glass to form waveguides using high repetition rate femtosecond laser.The tellurite matrix was modified oxides P, Na and Zn elements which Te play an important role upon laser irradiation.Tellurium observed migrate causing positive index change zone whereas sodium migrates the tellurium deficient forming relatively low region.We have used micro-Raman analysis scan across waveguide cross-section understand state network...

Local compositional changes induced by high repetition rate fs-laser irradiation can be used to produce performance optical waveguides in phosphate-based glasses. The waveguide refractive index contrast is determined the local concentration of La, which changed action writing laser pulses. In this work, we have investigated degree control that exerted using mechanism over cross-section guiding region, and induced. These variables smoothly controlled via processing parameters slit shaping...

Zinc-based oxides are the main products obtained after Waelz process, a metallurgical method used industrially for treatment of electric arc furnaces. These have certain impurities in their composition, which can be disadvantage. Carbochlorination reduction reactions proven to useful eliminating (especially Pb) through thermal treatments. In this work, purifying oxide carbochlorination is presented. Several experiments been conducted with aim obtaining samples potential end applications. A...

We have investigated the electrical and optical properties of deep levels responsible for 1.4–1.5 eV luminescence band usually observed in II–VI compounds. compared energy found by cathodoluminescence junction spectroscopy methods semi-insulating (CdTe:Cl Cd0.8Zn0.2Te) semiconducting samples (undoped CdTe). The techniques utilized were level transient (DLTS) on photoinduced current photo-DLTS high resistivity materials. These last two are complementary allow determination trap character...

The binding of O ‐methyl and fluorodeoxy derivatives methyl β‐lactoside to the Ricinus communis toxin (RCA60) agglutinin (RCA120) was studied in order determine donor/acceptor relationships hydrogen bonds between hydroxyl groups sites lectins. Free energy contributions at each position have been estimated from these data those previously reported for monodeoxy [Rivera‐Sagredo, A., Solís, D., Díaz‐Mauriño, T., Jiménez‐Barbero, J. & Martín‐Lomas, M. (1991) Eur. Biochem. 197 , 217–228;...

Sintering of a ZnO–SnO2 mixture under argon flow leads to the growth microrods on sample surface, which are formed by oriented stacks nanoplates. Energy dispersive spectroscopy and cathodoluminescence (CL) in scanning electron microscope show that nanoplates consist Sn doped ZnO. The have well defined orientations relative axis rod. formation nanoplates, is not observed when undoped ZnO used same process, attributed stresses generated presence atoms rods.

Fe doped ZnO nanowires, nanorods, and urchin-like nanostructures have been grown using an evaporation-deposition method with compacted mixtures of ZnS Fe2O3 powders, different contents as precursors. Treatments at 950 °C under argon flow lead to the growth iron other on surface sample. The incorporation into has investigated via energy dispersive spectroscopy well by cathodoluminescence in a scanning electron microscope photoluminescence optical microscope. content structures is limited...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMichael Additions of .alpha.-Sulfinyl and .alpha.-Sulfonyl Carbanions: The Unprecedented Reaction .beta.-Keto Sulfoxides Sulfones with Highly Stabilized Michael AcceptorsJose-Luis Marco, Inmaculada Fernandez, Noureddine Khiar, Paloma Antonio RomeroCite this: J. Org. Chem. 1995, 60, 21, 6678–6679Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October...

Protein molecular interactions involved in the formation of protein network pork and chicken gels made by heating (70 °C) under pressure (200 400 MPa) were studied. Gel properties influenced both treatment species. In species, pressurization favored that had better water binding but less hard chewy. Nondenatured proteins thermally detected batters after all combined pressure/heat processes. Heating-under-pressure conditions caused breakdown myosin molecules, so salt soluble content was...

Sintering of ZnO pressed powder under Ar flow at temperatures between 1250 and 1300 °C leads to the formation elongated microstructures nanostructures, with different morphologies, on sample surface. Rods needles cross-sectional dimensions ranging from tens nanometres several microns up hundreds in length are obtained. In an advanced stage growth, nanoneedles frequently arranged bundles, forming walls tubes dimensions. addition, microcombs microfeathers consisting well oriented observed....

FS-laser irradiation at high repetition pulse rate enables producing high-performance passive waveguides in different glasses through the local modification of glass composition. In this paper, we show that mechanism can similarly be used to produce waveguide amplifiers and lasers. Furthermore, feasibility active with optical gains same phosphate sample by changing laser writing parameters. The lanthanides present composition (Er <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...