The behaviors of the electrical resistance at room and high (200 deg. C) temperatures of acceptor (Mg)-doped BaTiO{sub 3} ceramics with the increase of acceptor concentration were investigated. A series of coarse-grained specimens with different acceptor concentrations that were sintered at ...

The authors provide two routes to increase the photocurrent of organic photodetectors that are based on electron-donor and electron-acceptor materials. During device fabrication, they introduce carbon nanotubes, which act as channels for electron transport. The channels in effect provide an approach to address the problem of low carrier mobility in the ...

The difference in the resistance degradation behavior was investigated between fixed valence acceptor (Mg) and the variable valence acceptor (Mn)-doped BaTiO3 ceramics with an increase of each acceptor concentration. Coarse-grained specimens with uniform grain sizes and different ...

Pyrolytic carbon that exhibits negative magnetoresistance is irradiated with 2 MeV electrons at temperatures below 35 K, and the changes in electronic transport properties such as zero-magnetic field resistivity, Hall coefficient, and magnetoresistance are measured as a function of electron fluence. With increasing electron fluence, the zero-field ...

Laboratory examination of several of the refractory materials used in lining this gasifier led to the conclusion that the use of 50 percent silica-alumina castable material in hydrogasification environments results in reasonably good material life and performance. The beneficial effects of increased compressive strength and erosion resistance by steam ...

A GaN/AIGaN heterojunction bipolar transistor has been fabricated using C12/Ar dry etching for mesa formation. As the hole concentration increases due to more efficient ionization of the Mg acceptors at elevated temperatures (> 250oC), the device shows improved gain. Future efforts which are briefly summarized. should focus on methods for reducing base ...

A multilayer semiconducting BaTiO3 ceramics having positive temperature coefficient of resistivity (PTCR) characteristics is investigated with the aim of lowering its resistance. The multilayer BaTiO3 ceramics was fired in reducing atmosphere and reoxidized at 700 �C in air. The result reveals that the multilayer semiconducting BaTiO3 ceramics with Ni ...

... conductivity in Germanium resistance thermometers General Shallow acceptor states in Germanium Growth of zinc telluride single crystals from the ...

... The Forster energy transfer efficiency was found to increase with increasing acceptor concentration, reaching an asymptotic maximum of 48% at ...

Zn0.95?xCo0.05CuxO powders have been synthesized by the sol-gel method and the structural, magnetic and electrical properties of the powders have been investigated. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) indicate that the Co ions do not change the ZnO wurtzite structure. Magnetic measurements indicate that Co doping can induce room temperature (RT) ferromagnetism and ...

New approaches to DNA sequencing are required to reduce costs and increase the availability of personalized genomics. Using Scanning Tunneling Microscope as a tool, we report measurements of the current signals generated as free nucleosides diffuse into a tunnel junction in which both electrodes are functionalized with a reagent that presents a hydrogen bond donor and ...

Different amounts of K2CO3 were added to (Ba,Sr)TiO3 based PTCR (positive temperature coefficient of resistance) ceramics to investigate their influence on the microstructural and electrical properties. Experimental results showed that the incorporation of K acted as an A-site acceptor-type dopant. In addition to enhancing discontinuous grain growth, the ...

Experiments in mice involving irradiation of the ascites tumor in vitro showed significant protective effects of cysteamine, nicotinic acid amide and serotonin, whereas thiourea, D-penicillamine, 5-mercaptopyridoxine, and nicotinic acid were found to increase the sensitivity of the tumor to radiation. In vivo experiments with the solid tumor showed marked ...

Colloidal semiconductor quantum dots (QDs) such as those made of CdSe-ZnS core-shell nanocrystals offer a promising alternative to organic dyes in a variety of biological tagging applications. They exhibit high resistance to chemical and photo-degradations, are highly luminescent, and show unique size-specific optical and spectroscopic properties. We have previously ...

The effectiveness of diuron, atrazine, procyazine, and cyanazine were compared in controlling growth of redroot pigweed (Amaranthus retroflexus L.) in hydroponic culture. A very marked differential inhibition response was observed for atrazine between resistant and susceptible biotypes. Procyazine and cyanazine exhibited less dramatic differential responses, whereas diuron was ...

The effectiveness of diuron, atrazine, procyazine, and cyanazine were compared in controlling growth of redroot pigweed (Amaranthus retroflexus L.) in hydroponic culture. A very marked differential inhibition response was observed for atrazine between resistant and susceptible biotypes. Procyazine and cyanazine exhibited less dramatic differential responses, whereas diuron was ...

... increasing degree of alkylation measure the effects of different donor groups on the OPA and TPA spectra. Effects of the acceptor ...

For the normal solar cell geometry, there is shown to be an upper limit to the cell conversion efficiency for each value of the silicon substrate resistivity. This limit cannot be exceeded regardless of possible improvements in material lifetime properties. It peaks for a value of substrate resistivity of about 0.1 omega.cm for p-type substrates ...

July 2006 Bi-doped ZnO films were grown on Si 111 substrates by molecular-beam epitaxy. X of electron concentration and an increase of resistivity for Bi-doped ZnO films. In addition, a 3.222 eV photoluminescence emission was observed particularly in the Bi-doped ZnO films and was identified as a donor

We have studied the effect of increasing acceptor concentration (between 1016 and 1018 cm-3) on bound excitons (BE's) using steady-state photoluminescence (PL) and PL excitation spectroscopy. With increasing doping concentration, an additional peak is observed on the low-energy side of the principal neutral ...

The hydrolysis of the donor substrate uridine diphosphate galactose (UDP-Gal) by human blood group B galactosyltransferase (GTB) has been followed by nuclear magnetic resonance in the presence and in the absence of an acceptor substrate analog. It is observed that the presence of the acceptor substrate analog promotes hydrolysis of UDP-Gal. Subsequent ...

... Title : A METHOD OF INCREASING THE WEAR RESISTANCE AND CORROSION RESISTANCE OF METALS AND ALLOYS BY SATURATING ...

Formation, microstructure, and electrophysical properties of positive temperature coefficient of resistance ceramics of the systems (Ba{sub 0.996}Y{sub 0.004})TiO{sub 3} and (Ba{sub 0.746}Ca{sub 0.1}Sr{sub 0.15}Y{sub 0.004})TiO{sub 3} with manganese as acceptor dopant have been investigated. Is has been shown that manganese ions ...