zirconia nanocrystals studied: Topics by WorldWideScience.org

Sintering behavior and mechanical properties of zirconia compacts fabricated by uniaxial press forming

Colloidal nanocrystals attract significant interest due to their potential applications in electronic, magnetic, and optical devices. Nanocrystal supercrystals (NCSCs) are particularly appealing for their well ordered structure and homogeneity. The interactions between organic ligands that passivate the inorganic nanocrystal cores critically influence their self-organization into supercrystals, By investigating the mechanical properties of supercrystals, we can directly characterize the particle-particle interactions in a well-defined geometry, and gain insight into both the self-assembly process and the potential applications of nanocrystal supercrystals. Here we report nanoindentation studies of well ordered lead-sulfide (Pbs) nanocrystal supercrystals. Their modulus and hardness were found to be similar to soft polymers at 1.7 GPa and 70 MPa respectively and ...

2009-12-30

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The dependence of the temperature of crystal-liquid phase transition on the size and shape of simple nanocrystal

PURPOSEThe purpose of this study was to compare the linear sintering behavior of presintered zirconia blocks of various densities. The mechanical properties of the resulting sintered...Full Text Available

2010-09-01

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British Library Electronic Table of Contents (United Kingdom)

The dependence of melting temperature T m on the size and shape of an n -dimensional nanocrystal of elementary single-component substance is studied. The nanocrystal has the form of an n-dimensional parallelepiped with a square base. The ratio of the length of side rib to the length of base rib (which is equal to f) defines the form of the system. It is demonstrated that, if the surface pressure is ignored, the value of T m decreases with isomorphic (f = const) decrease in the size of nanocrystal. In so doing, the more the value of form parameter f deviates from unity, the more appreciable the size dependence of T m will be. However, if the surface pressure (?Laplace pressure??) is taken into account in the case of decrease in size, the value of T m may vary significantly. In so doing, if ...

2009-01-01

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Microstructural characterization of ZrO_2/O'-SiAlON composites

Osseointegration of zirconia implants compared with titanium: an in vivo study

Zirconia has demonstrated a very moderate toughening effect in nitrogen-based ceramic composites because the reaction between tetragonal zirconia (t-ZrO_2) and nitrogen results in additional zirconia stabilization to a nontransformable t' or cubic structure. In O'-SiAlON matrices, the oxygen concentration increases and the oxygen-rich intergranular glassy phase prevents zirconia from nitridation. As a result, tetragonal ZrO_2 is maintained and is transformable in the O'-SiAlON materials. The present study has provided transmission electron microscopy (TEM) evidence of the zirconia transformation and the associated toughening effect in a ZrO_2/O'-SiAlON composite. The implications and limitations of the transformation on toughening of the material are discussed.

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Structure and Optical Properties of Silicon Layers with GaSb Nanocrystals Created by Ion-Beam Synthesis

BackgroundTitanium and titanium alloys are widely used for fabrication of dental implants. Since the material composition and the surface topography of a biomaterial play a fundamental...Full Text Available

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Influence of substructure design and spacer settings on the in vitro performance of molar zirconia crowns

We have studied the ion-beam synthesis of GaSb nanocrystals in Si by high-fluence '' hot '' implantation of Sb and Ga ions followed by thermal annealing. The Rutherford backscattering, transmission electron microscopy/transmission electron diffraction, Raman spectroscopy and photoluminescence were used to characterize the implanted layers. It was found that the nanocrystal size increases from 5 to 60 nm in the samples annealed at 900"oC up to 20-90 nm in those annealed at 1100"oC. For the samples annealed at 900"oC a broad band in the region of 0.75-1.05 eV is registered in the photoluminescence spectra. The nature of this photoluminescence band is discussed. (author)

2011-07-01

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British Library Electronic Table of Contents (United Kingdom)

Objectives: The aim of this study was to evaluate the in vitro behaviour of all-ceramic zirconia molar crowns in regard to different core designs and marginal fit. Methods: Identically shaped methacrylate molars were prepared according to the ceramic restoration directives resulting in a 1-mm deep circular shoulder preparation. They were embedded in polymethylmethacrylate resin after covering their roots with a polyether layer to simulate periodontal mobility. The crown cores were made of yttria-stabilized zirconia veneered with a corresponding veneering ceramic. The crowns were divided into 5 groups (n=8) which differed in core design and cement gap thickness: #1: simple core, 40mm cement; #2: core with minimal occlusal support, 40mm cement; #3: core with optimized cusp support, 40mm ceme...

2009-01-01

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Effect of hydrostatic pressure on photoluminescence spectra from structures with Si nanocrystals fabricated in SiO_2 matrix

A plasma process for the synthesis of cubic-shaped silicon nanocrystals for nanoelectronic devices

The effect of hydrostatic pressure applied at high temperature on photoluminescence of Si-implanted SiO_2 films was studied. A 'blue'-shift of PL spectrum from the SiO_2 films implanted with Si"+ ions to total dose of 1.2x10"1"7 cm"-"2 with increase in hydrostatic pressure was observed. For the films implanted with Si"+ions to a total dose of 4.8x10"1"6 cm"-"2 high temperature annealing under high hydrostatic pressure (12 kbar) causes a 'red'-shift of photoluminescence spectrum. The 'red' photoluminescence bands are attributed to Si nanocrystals while the 'blue' ones are related to Si nanocrystals of reduced size or chains of silicon atoms or Si-Si defects. A decrease in size of Si nanocluster occurs in result of the pressure-induced decrease in the diffusion of silicon atoms. (author)

2001-09-23

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Mass production of refractory oxide crystals: cubic zirconia

Low pressure silane plasmas are known for their ability to synthesize silicon nanoparticles via gas phase nucleation. While in the past this particle formation has often been considered from the viewpoint of a contamination problem in semiconductor processing, we here describe a silane low pressure plasma that enables the synthesis of highly oriented, cubic-shaped silicon nanocrystals with a rather monodisperse size distribution. These silicon nanocubes have successfully been used in the manufacture of single nanoparticle vertical transistors. We discuss the advantages of this new paradigm of building nanoelectronic devices. The plasma synthesis process is characterized in more detail than in prior work. The particle nucleation, growth and shape evolution are studied. Results indicate that the process provides two spatially distinct zones: a diffuse plasma for particle growth and a constricted plasma zone for particle annealing. Measurements of ...

2007-04-21

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Electronic spectra of semiconductor nanocrystals

Short communication

1993-03-01

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Diffraction studies of nanocrystals: theory and experiment

Semiconductor nanocrystals smaller than the bulk exciton show substantial quantum confinement effects. Recent experiments including Stark effect, resonance Raman, valence band photoemission, and near edge X-ray adsorption will be used to put together a picture of the nanocrystal electronic states.

1993-12-31

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Study of iodine migration in zirconia using stable and radioactive ion implantation

Based on theoretical calculations of powder diffraction data it is shown that the assumption of the infinite crystal lattice for small particles is not justified, leads to significant changes of the diffraction patterns, and may lead to erroneous interpretation of the experimental results. An alternate evaluation of diffraction data of nanoparticles, based on the so-called 'apparent lattice parameter', alp, is proposed. (author)

2001-09-23

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Dissolution Kinetics of Zirconia Calcine

The large uranium fission cross section leading to iodine and the behaviour of this element in the cladding tube during energy production and afterwards during waste storage is a crucial problem, especially for {sup 129}I which is a very long half-life isotope (T=1.59 x 10{sup 7} yr). Since a combined external and internal oxidation of the zircaloy cladding tube occurs during the reactor processing, iodine diffusion parameters in zirconia are needed. In order to obtain these data, stable iodine atoms were first introduced by ion implantation into zirconia with an energy of 200 keV and a dose equal to 8 x 10{sup 15} at cm{sup -2}. Diffusion profiles were measured using 3 MeV alpha-particle Rutherford backscattering spectrometry at each step of the annealing procedure between 700 C and 900 C. In such experiments a reduced iodine concentration was observed, which correlated to a diffusion-like process. Similar analysis has been performed using ...

1998-03-01

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Concerns of Hydrothermal Degradation in CAD/CAM Zirconia

Liquid radioactive raffinates from nuclear fuel reprocessing at the Idaho National Engineering and Environmental Laboratory were solidified, or calcines, in a fluidized bed reactor at approximately 500 C to form a dry granular material. This calcine has been provisionally stored near-surface in concrete-encased stainless steel bins at the Idaho Nuclear Technology Engineering Center. Research addressing the permanent immobilization of radioactive waste has been ongoing. One option is to separate the radioactive constituents from the calcine, thereby reducing the radioactive waste volume to be ultimately stored at a national nuclear waste repository. Nitric acid dissolution of the calcine is a key front-end unit operation in the separations option. In order to design calcine dissolution equipment, quantification of dissolution reaction rate parameters is required. A pilot-plant-produced, non-radioactive calcine was utilized to study the dissolution kinetics of a ...

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A facile and green preparation of high-quality CdTe semiconductor nanocrystals at room temperature

Zirconia-based restorations are widely used in prosthetic dentistry; however, their susceptibility to hydrothermal degradation remains elusive. We hypothesized that CAD/CAM machining and subsequent...Full Text Available

2010-01-01

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Numerical study of semi-molten droplet impingement

One chemical reagent, hydrazine hydrate, was discovered to accelerate the growth of semiconductor nanocrystals (cadmium telluride) instead of additional energy, which was applied to the synthesis of high-quality CdTe nanocrystals at room temperature and ambient conditions within several hours. Under this mild condition the mercapto stabilizers were not destroyed, and they guaranteed CdTe nanocrystal particle sizes with narrow and uniform distribution over the largest possible range. The CdTe nanocrystals (photoluminescence emission range of 530-660 nm) synthesized in this way had very good spectral properties; for instance, they showed high photoluminescence quantum yield of up to 60%. Furthermore, we have succeeded in detecting the living Borrelia burgdorferi of Lyme disease by its photoluminescence image using CdTe nanocrystals.

2008-06-18

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British Library Electronic Table of Contents (United Kingdom)

Due to the low thermal conductivity of ceramics large temperature gradients are present through the powder particles during plasma spray deposition. As a result the particles often impinge at the substrate in a semi-molten form; which in turn substantially affects the final characteristics of the coating being formed. This study is dedicated to the novel modelling development and simulation of a semi-molten droplet impingement. The study examines the impingement process during impact, spreading and solidification of semi-molten zirconia. The simulation provides an insight to the heat transfer process during impact and solidification of a semi-molten powder particle and illustrates the freezing-induced break-up mechanism at the splat periphery.

2011-01-01

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Synchrotron SAXS Studies of Nanostructured Materials and Colloidal Solutions: A Review

Scientific Electronic Library Online (English)

Abstract in english Structural characterisations using the SAXS technique in a number of nanoheterogeneous materials and liquid solutions are reviewed. The studied systems are protein (lysozyme)/water solutions, colloidal ZnO particles/water sols, nanoporous NiO-based xerogels, hybrid organic-inorganic siloxane-PEG and PPG nanocomposites and PbTe semiconductor nanocrystals embedded in a glass matrix. These investigations also focus on the transformations of time-varying structures and on str (more) uctural changes related to variations in temperature and composition. The reviewed investigations aim at explaining the unusual and often interesting properties of nanostructured materials and solutions. Most of the reported studies were carried out using the SAXS beamline at the National Synchrotron Light Laboratory (LNLS), Campinas, Brazil.

2002-03-01

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Whispering gallery modes in silicon-nanocrystal-coated silica microspheres

Tracing of salicylic acid additive during precipitation of zirconium

Silica microspheres were deposited into two-dimensional periodic arrays and coated with a thin layer of silicon nanocrystals. The luminescence from the silicon nanocrystals coupled into the whispering gallery modes of the spheres, with Q factors that depended on a range of parameters including sphere size, position on the sphere, viewing direction, and thickness of the nanocrystal coating. Scattering from the film-sphere and/or the sphere-substrate contacts resulted in a lower Q for modes that intersect these regions. The highest Q factors obtained in this work were {approx}1500. The results suggest that silica microspheres may be promising candidates for high-Q cavities that incorporate silicon nanocrystals for cavity QED or nonlinear optical effects.

2007-10-15

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Practical measurement of diffusion constants in sintered zirconias by using a light-scattering method

This paper presents the results of experimental study carried out to know whether the salicylic acid used as an additive during the precipitation of zirconium using ammonium hydroxide solution goes into the filtrate, remains in the hydrated zirconia or gets distributed between the both under the ambient conditions of precipitation. Keeping its simplicity and amenability to adopt on a routine basis, spectrophotometric method has been chosen for the purpose among the many methods available and the problems associated in determining salicylic acid in the presence of zirconium and the medial measures to circumvent the same have been brought out in detail. (author)

2011-02-22

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Nanocrystal conversion chemistry: A unified and materials-general strategy for the template-based synthesis of nanocrystalline solids

A practical method to determine the ionic diffusion coefficient and activation energy by using quasielastic light scattering (QELS) is presented. It is shown that a temperature dependence curve of the QELS intensity at a fixed frequency can be well fitted by Jonscher's formula and that the diffusion parameters can be obtained from this curve fitting. This method is successfully applied not only to crystals with high optical quality, as reported earlier, but also to opaque ceramics, which are more important than the crystals from a practical point of view. The composition dependence of the ionic diffusion coefficient is studied in sintered YbSZ to show the usefulness of this method.

1991-03-01

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Studies of dynamic contact of ceramics and alloys for advanced heat engines: Final report

The concept of nanocrystal conversion chemistry, which involves the use of pre-formed nanoparticles as templates for chemical transformation into derivative solids, has emerged as a powerful approach for designing the synthesis of complex nanocrystalline solids. The general strategy exploits established synthetic capabilities in simple nanocrystal systems and uses these nanocrystals as templates that help to define the composition, crystal structure, and morphology of product nanocrystals. This article highlights key examples of 'conversion chemistry' approaches to the synthesis of nanocrystalline solids using a variety of techniques, including galvanic replacement, diffusion, oxidation, and ion exchange. The discussion is organized according to classes of solids, highlighting the diverse target systems that are accessible using similar chemical concepts: metals, oxides, chalcogenides, phosphides, ...

2008-07-01

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Synthesis of nanocrystalline YSZ (ZrO_2-8Y_2O_3) powder by polymerized complex method

In support of the efforts to apply ceramics in advanced heat engines, a study was made of the sliding performance of ceramics at the ring/cylinder interface of low heat rejection engines. The objective was to understand the basic mechanisms controlling the wear of candidate ceramics and thereby identify means for applying these ceramics effectively. Attempts to operate three different zirconias, silicon carbide, silicon nitride, and several plasma-sprayed ceramic coatings without lubrication were unsuccessful because of high friction and high wear rates. Experiments using a polyalphaolefin lubricant at temperatures to 260 C identified several combinations having wear rates in the general range likely to be acceptable for engines. Plasma-sprayed coatings of chromium oxide and hypersonic powder flame sprayed coatings of cobalt-bonded tungsten carbide performed particularly well as ring coatings. Similar performance was obtained with these ring ...

1988-03-01

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Precipitation during controlled cooling of magnesia-partially-stabilized zirconia

In this study nanocrystalline powders of yttria-stabilized zirconia (ZrO_2-8Y_2O_3) have been synthesized through 'polymerized complex method'. Zirconium chloride, yttrium nitrate, citric acid and ethylene glycol were polymerized at 80 "oC to produce a gel-like mass in which metallic ions were uniformly distributed. During the thermal treatment of dried gel, nanocrystalline powder was formed at 450 "oC and 650 "oC for 2 h. Thermal reactions and crystalline phase formation of the dried gel were investigated through thermal analysis and X-ray diffraction analysis, respectively. The results of thermal analysis and XRD showed the formation of nanocrystalline powder at less than 600 "oC. Chemical bonding of the dried gel was investigated by Fourier transform infrared spectroscopy analysis. Morphology of powder calcined at 650 "oC was analyzed by scanning electron microscope. Yttria-stabilized zirconia powders with the mean ...

2010-02-18

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Precipitation during controlled cooling of magnesia-partially-stabilized zirconia

A study has been made of the precipitation and growth processes which occur during cooling from solution treatment and under isothermal hold conditions in a magnesia-partially-stabilized zirconia alloy. Three types of precipitate have been identified which develop during cooling or during isothermal hold treatments just above and below the eutectoid temperature. These precipitate forms are termed (i) primary, (ii) large random, and (iii) secondary. Further precipitation, slow growth of existing precipitates, and subeutectoid decomposition result when an additional 1100/sup 0/C aging treatment is given to the previously cooled material. It is shown that type (iii) secondary precipitates from rapidly within the temperature range of 1300/sup 0/ to 1375/sup 0/C. The secondary precipitates are largely responsible for the improved room-temperature strength properties of the heat-treated samples. The formation and effects on mechanical properties of ...

1986-07-01

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Finite element analysis of stresses associated with transformations in magnesia partially stabilized zirconia

A study has been made of the precipitation and growth processes which occur during cooling from solution treatment and under isothermal hold conditions in a magnesia-partially-stabilized zirconia alloy. Three types of precipitate have been identified which develop during cooling or during isothermal hold treatments just above and below the eutectoid temperature. These precipitate forms are termed (i) primary, (ii) large random, and (iii) secondary. Further precipitation, slow growth of existing precipitates, and subeutectoid decomposition result when an additional 1100"0C aging treatment is given to the previously cooled material. It is shown that type (iii) secondary precipitates from rapidly within the temperature range of 1300"0 to 1375"0C. The secondary precipitates are largely responsible for the improved room-temperature strength properties of the heat-treated samples. The formation and effects on mechanical properties of each type of ...

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Osseointegration of zirconia implants: an SEM observation of the bone-implant interface

Anisotropy finite element analysis was performed to study stresses associated with the tetragonal precipitates and the tetragonal to monoclinic transformation in MgO partially stabilized zirconia. Stresses were assumed to be caused by the lattice misfits between the product phase and the parent phase. In the finite element calculations, the tetragonal and monoclinic precipitates were assumed to be lenticular in shape, and the anisotropic elastic constants of the cubic, tetragonal and monoclinic phases were considered. The purpose of this paper is to obtain some knowledge about how stresses respond when the microstructure is changed, and how stress fields affect microstructure development. The finite element results show that increasing a{sub t}/a{sub c} and decreasing c{sub t}/a{sub c} can create a favorable stress field to reduce the growth rate of tetragonal precipitates during the heat treatment. Stresses associated with the single ...

1999-11-30

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Temperature evolution of the internal magnetic hyperfine field of Metglas: amorphous and crystallized phases

BackgroundThe successful use of zirconia ceramics in orthopedic surgery led to a demand for dental zirconium-based implant systems. Because of its excellent biomechanical characteristics,...Full Text Available

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Performance of ceramics in ring/cylinder applications

We present differential scanning calorimetry (DSC), X-ray diffractometry, in situ Moessbauer spectroscopy (MS), and transmission electron microscopy (TEM) studies in Metglas ribbons subjected to different heat treatments. The temperature evolution of the hyperfine field H_h_f(T) and the Curie temperature (T_c) of the amorphous phase are determined. The magnetic field originally present in the amorphous phase has a 'normal' behavior, in the sense that it can be described by the Weiss molecular field theory. The total angular momentum of the iron atoms turns out to be 5/2 and this implies Fe"3"+ in which the electronic spins are uncoupled. When the samples are maintained near T_c (#approx#673 K), three new magnetic phases are detected in the Moessbauer spectra, indicating an onset of a crystallization process well below the first crystallization temperature (T_X_1), as determined by DSC (#approx#820 K). The magnetic behavior of these phases is also described by ...

2000-11-01

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Tris(2,2prime-bipyridyl)ruthenium(II) Electrogenerated Chemiluminescence Sensor Based on Platinized Carbon Nanotube-Zirconia-Nafion Composite Films

In support of the efforts to apply ceramics to advanced heat engines, a study is being performed of the performance of ceramics at the ring/cylinder interface of advanced (low heat rejection) engines. The objective of the study, managed by the Oak Ridge National Laboratory, is to understand the basic mechanisms controlling the wear of ceramics and thereby identify means for applying ceramics effectively. Attempts to operate three different zirconias, silicon carbide, silicon nitride, and plasma-sprayed ceramic coatings without lubrication have not been successful because of excessive friction and high wear rates. Silicon carbide and silicon nitride perform well at ambient temperatures with fully formulated mineral oil lubrication, but are limited to temperatures of 500F because of the lack of suitable liquid lubricants for higher temperatures.

1987-01-01

31

British Library Electronic Table of Contents (United Kingdom)

Mesoporous films of platinized carbon nanotube-zirconia-Nafion composite have been used for the immobilization of tris(2,2prime-bipyridyl)ruthenium (II) (Ru(bpy)32+) on an electrode surface to yield a solid-state electrogenerated chemiluminescence (ECL) sensor. The composite films of Pt-CNT-zirconia-Nafion exhibit much larger pore diameter (3.55 nm) than that of Nafion (2.82 nm) and thus leading to much larger ECL response for tripropylamine (TPA) because of the fast diffusion of the analyte within the films. Due to the conducting and electrocatalytic features of CNTs and Pt nanoparticles, their incorporation into the zirconia-Nafion composite films resulted in the decreased electron transfer resistance within the films. The present ECL sensor based on the Pt-CNT-zirconia-Nafion gave a lin...

2010-01-01

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Nanocrystal Bioassembly: Asymmetry, Proximity, and Enzymatic Manipulation

Mechanics and mechanisms of cyclic fatigue-crack propagation in transformation-toughened zirconia ceramics

Research at the interface between biomolecules and inorganic nanocrystals has resulted in a great number of new discoveries. In part this arises from the synergistic duality of the system: biomolecules may act as self-assembly agents for organizing inorganic nanocrystals into functional materials; alternatively, nanocrystals may act as microscopic or spectroscopic labels for elucidating the behavior of complex biomolecular systems. However, success in either of these functions relies heavily uponthe ability to control the conjugation and assembly processes.In the work presented here, we first design a branched DNA scaffold which allows hybridization of DNA-nanocrystal monoconjugates to form discrete assemblies. Importantly, the asymmetry of the branched scaffold allows the formation of asymmetric2assemblies of nanocrystals. In the context of a self-assembled device, this can be ...

2008-05-01

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Photochemical synthesis of ZnO/Ag nanocomposites

Damage and cyclic fatigue failure under alternating loading in transformation-toughened zirconia ceramics is reviewed and compared to corresponding behavior under quasi-static loading (static fatigue). Current understanding of the role of transformation toughening in influencing cyclic fatigue-crack propagation behavior is examined based on studies which altered the extent of the tetragonal-to-monoclinic phase transformation in MG-PSZ through subeutectoid aging. These studies suggest that near-tip computations of the crack-driving force (in terms of the local stress intensity) can be used to predict crack-growth behavior under constant amplitude and variable-amplitude (spectrum) loading, using spatially resolved Raman spectroscopy to measure the extent of the transformation zones. In addition, results are reviewed which rationalize distinctions between the crack-growth behavior of preexisting, long'' (> ...

1992-05-01

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ZrO_2/O' sialon composites containing mixed additives

Composite ZnO/Ag nanoparticles have been formed via the photocatalytic reduction of silver nitrate over the ZnO nanocrystals, their optical, electrophysical and photochemical properties have been investigated. Mie theory has been applied to analyze the structure of the absorption spectra of ZnO/Ag nanocomposite. The irradiation effects upon the optical properties of ZnO/Ag nanostructure have been investigated. It has been found that the irradiation of ZnO/Ag nanoparticles results in electrons accumulation by both the semiconductor and the metallic components of the nanocomposite. It has been found that silver nitrate can be photochemically deposited onto the surface of ZnO nanoparticles under the illumination with the visible light in the presence of the sensitizer - methylene blue. Kinetics of the sensitized Ag(I) photoredution has been studied. It has been concluded that the key stage of this process is the electron injection from ...

2007-06-15

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Crystal structure, local atomic order and metastable phases of zirconia-based ceramics for solid oxide fuel cells

Mixed additions of Sm_2O_3 and Y_2O_3 were used in the formation of zirconia-containing O'-sialon composites, where Sm_2O_3 was used for the purpose of densification and Y_2O_3 for zirconia stabilization. Dense ZrO_2/O' -sialon composites were produced at 1500 deg C. by sintering in nitrogen for 4 hours. Tetragonal zirconia remained in the product and t#->#m transformation was observed when the sample was ground into powder. However, the improvement in fracture toughness was not significant and this was attributed to the weakened transformability of the tetragonal zirconia phase in the nitrogen-based materials. 18 refs., 4 tabs., 2 figs.

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Behavior of osteoblastic cells cultured on titanium and structured zirconia surfaces

... structure crystal-phase transformations fluorescence fluorescence spectroscopy

2011-02-22

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Proton exchange membrane fuel cells with chromium nitridenanocrystals as electrocatalysts

BackgroundOsseointegration is crucial for the long-term success of dental implants and depends on the tissue reaction at the tissue-implant interface. Mechanical properties and biocompatibility...Full Text Available

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Advanced Ceramic Technology

Polymer electrolyte membrane fuel cells (PEMFCs) are energy conversion devices that produce electricity from a supply of fuel, such as hydrogen. One of the major challenges in achieving efficient energy conversion is the development of cost-effective materials that can act as electrocatalysts for PEMFCs. In this letter, we demonstrate that, instead of conventional noble metals, such as platinum, chromium nitride nanocrystals of fcc structure exhibit attractive catalytic activity for PEMFCs. Device testing indicates good stability of nitride nanocrystals in low temperature fuel cell operational environment.

2007-07-01

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Preparation of ZrO_2/O'-sialon composites using dissociation of zircon

"Precision manufacture of ceramic parts with CNC machining capability for aerospace, lasers, semiconductors and other industries. Materials include alumina, zirconia, glass, ferrites, silicon carbide, silicon nitride, sapphire, cordierite, mullite and others. A.C.T. has seen the number of applications and demand for high-realiability ceramics (aluminum oxide, zirconia, glass, ferrites, silicon carbide, silicon nitride, sapphire, cordierite, mullite, etc...) increase continually within the aerospace, computer and the industrial markets."

2007-02-01

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Mechanical property of superplastic-deformed ceramics by micro-indentation method

ZrO_2/O'-sialon composites were obtained via reaction sintering of ZrSiO_4 and Si_3N_4 powders at about 1700 deg C. Y_2O_3 was effective in both stabilizing of zirconia and densifying the composites. However, it is not easy to select an optimum value of the single additive to balance these two requirements simultaneously. With low Y_2O_3 addition, some tetragonal zirconia grains in the sintered samples are transformable during mechanical grinding but the full densification of the material is then sacrificed. On the other hand, addition more Y_2O_3 to achieve complete densification results in the zirconia being stabilized into undesirable t' or cubic forms. Therefore no improved toughening effects have been achieved in the composites. Heat-treatment of the materials at 1400 deg C. results in the diffusion of yttria from the grain boundary phase to zirconia and the formation of the O'-cubic ...

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Experimental study of the premixed combustion within the nonhomogeneous porous ceramic media

A neutron irradiation test on superplastic ceramic materials at high temperature has been proposed as an innovative basic research on high-temperature engineering using the High Temperature Engineering Test Reactor (HTTR). We investigated mechanical properties, such as the hardness and Young's modulus, of ceramic specimens after superplastic deformation. The tested material was 3Y-TZP (3mol% Yttria stabilized Tetragonal Zirconia Polycrystal) which is one of the representative superplastic ceramics. The properties were measured by a microindentation method. We also studied the relationship between crystal microstructures and the mechanical properties of deformed 3Y-TZP by scanning electron microscope (SEM). The indentation test showed that the mechanical properties of the specimens were reduced to about 1/2 by 30% deformation and to about 1/4 by 150% deformation. The SEM images showed that average grain size and deviation of grain size ...

2001-03-01

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Compression ignition of hydrogen in a direct injection diesel engine modified to operate as a low-heat-rejection engine

An experimental investigation of premixed methane-air combustion within the one-dimensional porous ceramic burners for various burner configurations is presented. The burner is nonhomogeneous because of different pore size ceramic block used in different section of the burner. Therefore, the thermophysical and transport properties are nonuniform along the burner core length. The burners are constructed of partially stabilized zirconia. The CO and NO{sub x} emissions, flame speed, and flame stability are examined and compared at lean equivalence ratios for five different burner configurations. The sandwich-structured burner has very favorable flame stabilizing characteristic due to the radiation reflecting region. While the combustion proceeds at faster rate than other burner configurations, the radiation reflecting region and the exit surface have low temperature. Thus the NO{sub x} emission can be kept at the same low level as the other burner configurations ...

1996-12-01

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Microstructure and fracture toughness of hot pressed zirconia-toughened sialon

The feasibility of using hydrogen as the sole fuel in a direct injection diesel engine was investigated. An air cooled single cylinder Lister ST1 diesel engine was modified to operate as a low-heat-rejection engine for this study. Partially stabilized zirconia ceramic parts were used to shield the combustion space of the engine. Using a compression ratio of 17.9:1 and motoring the test engine at 21000 rpm, a maximum compression temperature of approximately 900 K was achieved. Under these operating conditions, all lubricants tested were found to burn. Lowering the speed to 1450 rpm and the compression ratio to 17.1, lubricant combustion and hot spots were successfully eliminated. The maximum compression temperature, when compression ignition of hydrogen was tried, was in the 800 K range. The corresponding ceramic surface temperature was estimated to reach 600-700 K. Only sporadic compression ignition of hydrogen was achievable. (author).

1990-01-01

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Novel pseudo-morphotactic synthesis and characterization of tungsten nitride nanoplates

Zirconia-toughened sialon composites have been fabricated using conventional hot-pressing techniques. The fracture toughness and microstructure were determined for CeO_2- and Y_2O_3-stabilized ZrO_2 additives and also as a function of volume percent ZrO_2. The Yttria system showed a linear increase in fracture toughness with increasing volume fraction zirconia content while the ceria-stabilized system exhibited a peak in fracture toughness at 20 vol% ZrO_2 content. The fracture toughness at 800 C was measured and correlated with the microstructure. High-temperature stability was determined and it was found that the deleterious nitride phases of zirconium could be precluded from the microstructure.

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Nanoheterostructure Cation Exchange: Anionic Framework Conservation

A novel pseudo-morphotactic transformation route was developed to synthesize polycrystalline ?-W2N nanoplates by thermally treating tungstate-based inorganic-organic hybrid nanobelts with a lamellar microstructure in an NH3 flow. The tungstate-based hybrid nanobelts were formed in a water-in-oil-microemulsion-like 'commercial H2WO4 powders/n-octylamine/heptane' reaction system. The as-obtained hybrid nanobelts were thermally treated in an NH3 atmosphere at 650-800 oC for 2 h to form cubic ?-W2N nanoplates. XRD, SEM, TEM, FT-IR and TG-DTA were used to characterize the precursors and their final products. The polycrystalline ?-W2N nanoplates derived from hybrid nanobelts, with side lengths of several hundred nanometers, consist of small nanocrystals with an average grain size of 3.2 nm. The formation of ?-W2N nanoplates involved two steps: decomposing tungstate-based hybrid nanobelts into WOy and W species and then nitridizing the active W-containing species to ?-W2N ...

2011-02-01

46

Highly Porous, Water-Soluble, Superparamagnetic, and Biocompatible Magnetite Nanocrystal Clusters for Targeted Drug Delivery.

In ionic nanocrystals the cationic sub-lattice can be replaced with a different metal ion via a fast, simple, and reversible place-exchange, allowing post-synthetic modification of the composition of the nanocrystal, while preserving its size and shape. Here, we demonstrate for the first time that during such an exchange, the anionic framework of the crystal is preserved. When applied to nanoheterostructures, this phenomenon ensures that compositional interfaces within the heterostructure are conserved throughout the transformation. For instance, a morphology composed of a CdSe nanocrystal embedded in a CdS rod (CdSe/CdS) was exchanged to a PbSe/PbS nanorod via a Cu2Se/Cu2S structure. During every exchange cycle, the seed size and position within the nanorod were preserved, as evident by excitonic features, Z-contrast imaging, and elemental line-scans. Anionic framework conservation extends the domain of cation exchange to ...

2010-05-11

47

Effect of chemical composition of SiOx films on rapid formation of Si nanocrystals induced by thermal plasma jet irradiation

Magnetic particles have become very promising materials for drug delivery. However, preparation of magnetite particles with high surface area, biocompatibility, strong magnetic response, and suitable particle size still remains a major challenge. In this report, magnetite nanocrystal clusters with high surface areas were fabricated through a solvothermal process by introducing ammonium acetate as a porogen and trisodium citrate as a surface modification agent. The porosity, which was controlled by the reactant concentration, has been investigated in detail. The surface area of the nanocrystal clusters was as high as 141?m(2) g(-1) . Ibuprofen, as a model drug, was entrapped into the magnetite carriers. The interfacial interaction between the carboxylic groups on the drug molecules and the carboxylate groups on the carriers enhanced the loading efficiency. Low cytotoxicity in MCF-7 cell and in vitro constant drug release behavior combined with ...

2011-09-27

48

British Library Electronic Table of Contents (United Kingdom)

Si nanocrystal floating gate MOS capacitors were formed on p-Si (100) wafers by thermal plasma jet (TPJ) annealing of SiO2/SiOx /SiO2/Si(100) stacked structure. The chemical composition of SiOx layer was controlled by changing the SiH4, He, and O2 gas flow ratio during plasma enhanced chemical vapour deposition. The MOS capacitors showed clear hysteresis in capacitance-voltage (CV) characteristics after TPJ annealing. The hysteresis width shows maximum value when initial composition x =1.7, which shows the maximum photoluminescence (PL) intensity. The maximum hysteresis width of 6.8 V was observed with gate voltage swept between 20 and -20 V in x = 1.7 sample. The result means 7.4 x 1012 cm-2 carriers are injected to or emitted from Si nanocrystals. The duration of 1 V shift in flatband vo...

2010-01-01

49

Optical characterization of long-term ordered and nanocrystalline GaP

Synthesis and photoluminescence properties of continuous freestanding SiC(Al) films derived from aluminum-containing polycarbosilane

The paper generalizes some results of the United States/Moldova program on advanced composite organic and semiconductor light emitters. High density exciton system bound to N impurity superlattice grown by modern technologies and GaP:N, GaP:N:Sm nanocrystals distributed in transparent fluorine-containing polymers will be used as the base elements for new generation of optoelectronic devices. The work seeks to expand further the applications of GaP itself through the formation of nanocomposites. Classic and new methods are applied for preparation of GaP:N nanoparticles with the controlled dimensions developed clear quantum confinement effect. The long-term ordered bulk GaP crystals as well as their nanoparticles have been investigated by TEM, XRD, Raman scattering, and luminescent methods. The evolution of the Raman Light Scattering and luminescence spectra is reported from pure and doped GaP single crystals grown over 40 years ago and evaluated approximately every ...

50

XAFS studies of nanocomposite systems

Continuous freestanding SiC(Al) films were fabricated by melt spinning the aluminum-containing polycarbosilane (A-PCS) precursor. The results showed that the films contained #beta#-SiC crystals, #alpha#-SiC nano-crystals, C clusters and small amount of Al_4O_4C and Al_4SiC_4. The Al atoms in the films played important roles as both sintering aids and grain growth inhibitor. The PL spectrum showed a wide luminescence band from 320 nm to 440 nm, and the origin of PL centered at 385 nm might be related to the #alpha#-SiC nano-crystals using quantum size effects. The obtained films are expected to have important applications in MEMS for the environment of high temperature and optoelectronic devices.

2010-10-01

51

Processing of LiBH{sub 4} from its elements by ball milling method

Nanosized particles are important because of their unique properties, different from the bulk, which leads to their enhanced catalytic, photocatalytic and electronic properties. This work has dealt with three different nanoparticle systems in the context of three different aspects of nanoparticle properties: (a) photocatalytis (TiO2/metal) system, (b) luminescence (CdSe) (c) alloying (Pt-Ag and Pd-Ag). The initial photocatalytic enhancement obtained by adding noble metal on semiconductor nanoparticles, degrades as fast as in 15 minutes and questions their long-term performance. XANES measurements on such irradiated systems like TiO2/Au, TiO2/Pt, TiO2/Ir indicates a positive oxidation state of these noble metals which renders them as recombination centers for photo-excited electrons and explains the decreased photocurrent. The oxidation is caused by holes. The EXAFS results also indicate a change of the interfacial structure under the effect of UV-irradiation, thus affecting the ...

52

Development of a non-premix radiant burner. Final report

Investigations of alternative renewable energy resources continue, with many studies concentrating on hydrogen storage. However, there are a few problems such as storage, transportation, delivery to the user and usage safely, to be addressed to facilitate commercialization and wide usage of the hydrogen. The absorbed form within the metal hydrides seems to be the best solution of this problem. Since Li is the lightest metal, it has the advantage as the stored amount of hydrogen mass ratio. LiBH{sub 4} production process was investigated using elemental Li, B and H{sub 2}. Spex type ball milling with tungsten carbide, stainless steel and zirconia type vessels, was used to mix the different amount of Li and B under argon atmosphere. X-ray diffraction pattern demonstrated that the LiB was obtained. A system was designed to provide a hydrogen atmosphere of 60 bars to force hydrogen into the LiB structure. FTIR analysis strongly indicated the ...

2008-11-15

53

Particulate composites in the TiC-TiYTZP system

The objective of the first project period is to: make a study into materials suitable for the non-premix radiant burners (NPRB); choose the materials for the construction; make proposals for the design of the NPRB; test the different proposals with a CFD-model. In pursuit of finding a suitable material it is necessary first to estimate the maximum temperature that will occur in the burner. It has been estimated that the maximum adiabatic flame temperature will be about 2400-2500 K. The maximum temperature in the burner will of course never reach this level. A more realistic temperature was estimated to 2100-2300 K. The final choice was made after having contacted some of the leading producers. It was possible to find one producer that could produce burners of one of the suggested materials, zirconia. Several construction ideas for the NPRB have been discussed and some of them tested with a CFD-model. The proposed burner concept has been ...

1998-12-31

54

Ultraviolet upconversion luminescence enhancement in Yb3+/Er3+-codoped Y2O3 nanocrystals induced by tridoping with Li+ ions

Twelve powders of TiO_2-Y_2O_3-ZrO_2 solid solution of the methodically changed composition were prepared by a coprecipitation-calcination technique. After mixing with phenol-formaldehyde resin, the powders were calcinated for 2 hours at 1200"oC in vacuum. The resultant composite powders contained TiC and non-reacted carbon. Green compacts were sintered in vacuum at 1500"oC for 2 hours. A temperature increase was stopped at 1200"oC to react remains of carbon. There were two carbides in the composites TiC and ZrC. TiC non-stoichiometry depended on carbon content in the system. Phase composition of the depended on of titania and yttria in zirconia solid solution. The majority of the samples showed two tetragonal zirconia phases differing in lattice parameter and tetragonality. (author)

2004-09-12

55

Formation of oriented nanocrystals in an amorphous alloy by focused-ion-beam irradiation

Ultraviolet (UV) upconversion (UC) luminescence in Yb3+/Er3+-codoped yttrium oxide (Y2O3) nanocrystals can be enhanced by orders of magnitude via tridoping further with Li+ ions under diode laser excitation of 970 nm. Sensitized three-photon UC radiations at 390 and 409 nm, corresponding to the 4G11/2?4I15/2 and 4H9/2?4I15/2 of Er3+ ions, respectively, present an enhancement time of about 33 times, which is larger than the 24 times enhancement for the UC green radiation. The UV UC radiation at 320 nm that corresponds to the 2P3/2?4I15/2 of Er3+ ions has also been greatly enhanced. Theoretical calculations interpret that all the observed enhancement times of UV UC radiations arise from the prolonged lifetimes of their intermediate states.

2009-03-01

56

Zirconia-ceria: additive influence on the sintering and electric conductivity

Structural changes of a Ni-P amorphous alloy under focused-ion-beam (FIB) irradiation have been examined using transmission electron microscopy. On the irradiated plane, the formation of crystallographically orientated nanosized crystals (NCs), with the particle size of approximately 10 nm, was observed. A series of electron diffraction analyses have revealed that NCs have a face-centered-cubic (fcc) structure and the following orientation relationships between the NCs and the FIB direction were found. These are, irradiated plane//(111)_f_c_c and FIB direction//_f_c_c.

2002-12-09

57

Process for producing dimethyl ether form synthesis gas

Iron oxide as sintering aid to Ce-TZP ceramics produces a beneficial effect on the tetragonal phase stabilization. It was found that ceria powder particle size of 2,0 #mu#m turns the grain-boundary electrical conductivity higher than ceria powder of smaller grain size. (author)

1996-12-08

58

Joining of technical ceramics

This invention pertains to a Fischer Tropsch process for converting synthesis gas to an oxygenated hydrocarbon with particular emphasis on dimethyl ether. Synthesis gas comprising carbon monoxide and hydrogen are converted to dimethyl ether by carrying out the reaction in the presence of an alkali metal-manganese-iron carbonyl cluster incorporated onto a zirconia-alumina support.

1985-01-01

59

Effect of chemical composition of SiO{sub x} films on rapid formation of Si nanocrystals induced by thermal plasma jet irradiation

Large, complex, high purity ceramic shapes are required by a variety of emerging technologies for their electrical insulation and high temperature strength properties coupled with their refractoriness and purity. Ceramic sealant bonding, using crystalline and vitreous sealant materials, has recently shown significant potential for joining technical ceramics to form the required shapes. Materials and techniques for joining technical ceramics including alumina, magnesia, zirconia and thoria are discussed. (orig.).

60

QUEOS, a simulation-experiment of the premixing phase of a steam explosion with hot spheres in water base case experiments

Si nanocrystal floating gate MOS capacitors were formed on p-Si (100) wafers by thermal plasma jet (TPJ) annealing of SiO{sub 2}/SiO{sub x} /SiO{sub 2}/Si(100) stacked structure. The chemical composition of SiO{sub x} layer was controlled by changing the SiH{sub 4}, He, and O{sub 2} gas flow ratio during plasma enhanced chemical vapour deposition. The MOS capacitors showed clear hysteresis in capacitance-voltage (CV) characteristics after TPJ annealing. The hysteresis width shows maximum value when initial composition x =1.7, which shows the maximum photoluminescence (PL) intensity. The maximum hysteresis width of 6.8 V was observed with gate voltage swept between 20 and -20 V in x = 1.7 sample. The result means 7.4 x 10{sup 12} cm{sup -2} carriers are injected to or emitted from Si nanocrystals. The duration of 1 V shift in flatband voltage was {proportional_to}0.1 ms with 20 V pulse, and charged carriers were stably maintained for ...

2010-04-15

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61

Synthesis and characterization of Al{sub 2}O{sub 3}/ZrO{sub 2}, Al{sub 2}O{sub 3}/TiO{sub 2} and Al{sub 2}O{sub 3}/ZrO{sub 2}/TiO{sub 2} ceramic composite particles prepared by ultrasonic spray pyrolysis

This report describes the QUEOS facility and gives the results of the first test series performed up to 6/1995. The premixing phase of a steam explosion is investigated experimentally with simulant materials. The transient three-dimensional multi-component interaction of molten corium with water is studied using a large number of small solid spheres at temperatures up to 2300 C. The objective of the experiments is to establish a data base for testing the models of heat and momentum transfer in multi-fluid codes as well as the code`s capability to correctly describe multiphase flows. The experiments have the advantage that the diameter of the `coarse melt fragments` are known and that detailed measurements can be performed without the danger of a steam explosion. In this first series of experiments up to 10 kg of spheres (max. 24000 pieces) were used. The spheres, made of molybdenum or zirconia, were heated to temperatures up to 2000 C and are ...

1996-04-01

62

Synthesis and characterization of Al_2O_3/ZrO_2, Al_2O_3/TiO_2 and Al_2O_3/ZrO_2/TiO_2 ceramic composite particles prepared by ultrasonic spray pyrolysis

Fine ceramic particles of zirconia toughened alumina (ZTA), titania toughened alumina (TTA), and zirconia-titania toughened alumina (ZTTA) have been synthesized by ultrasonic spray pyrolysis (USP) at various temperatures from starting salt solutions of various compositions aiming for the development of catalytic material. These particles were characterized for properties such as shape, size and size distribution, diffraction pattern, and chemical and phase composition of elements by scanning electron microscopy (SEM), particle size analyzer (PSA), x-ray diffraction (XRD), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Chemical compositions and sizes of ceramic composites have been controlled by the stoichiometry of salt solutions and the flow rate of spraying solutions. The optimum experimental conditions for the various composite particle synthesis have been proposed.

2002-08-01

63

Role of yttria-stabilized zirconia produced by ion-beam-assisted deposition on the properties of RuO_2 on SiO_2/Si

Fine ceramic particles of zirconia toughened alumina (ZTA), titania toughened alumina (TTA), and zirconia-titania toughened alumina (ZTTA) have been synthesized by ultrasonic spray pyrolysis (USP) at various temperatures from starting salt solutions of various compositions aiming for the development of catalytic material. These particles were characterized for properties such as shape, size and size distribution, diffraction pattern, and chemical and phase composition of elements by scanning electron microscopy (SEM), particle size analyzer (PSA), x-ray diffraction (XRD), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Chemical compositions and sizes of ceramic composites have been controlled by the stoichiometry of salt solutions and the flow rate of spraying solutions. The optimum experimental conditions for the various composite particle synthesis have been proposed.

2002-08-01

64

Rheology of zirconia suspensions in a nonpolar organic medium

Highly conductive biaxially textured RuO_2 thin films were deposited on technically important SiO_2/Si substrates by pulsed laser deposition, where yttria-stabilized zirconia (YSZ) produced by ion-beam-assisted-deposition (IBAD) was used as a template to enhance the biaxial texture of RuO_2 on SiO_2/Si. The biaxially oriented RuO_2 had a room-temperature resistivity of 37 #mu##OMEGA#-cm and residual resistivity ratio above 2. We then deposited Ba_0_._5Sr_0_._5TiO_3 thin films on RuO_2/IBAD-YSZ/SiO_2/Si. The Ba_0_._5Sr_0_._5TiO_3 had a pure (111) orientation normal to the substrate surface and a dielectric constant above 360 at 100 kHz. copyright 1998 Materials Research Society.

1998-09-01

65

Composites in the TiC-TiYTZP system

Three dispersants (stearic acid, oleic acid, and poly-(12-hydroxystearic acid)) are compared for their ability to produce low-viscosity suspensions of zirconia in kerosene. Rheological measurements and sediment packing density measurements show that poly(12-hydroxystearic acid) is a better dispersant than stearic acid or oleic acid; this is explained in terms of the longer tail of the poly-(12-hydroxystearic acid) surfactant molecule. The amount of dispersant can be optimized to reduce viscosity and yield point of the suspension, and to eliminate thixotropic hysteresis. The use of a dispersion medium of lower viscosity than the dispersant makes it easy to detect when complete monolayer coverage has been achieved. The loss of pseudoplasticity, brought about by a higher degree of deflocculation, can be recovered by increasing the volume fraction of solids of a suspension and this is beneficial in the plastic forming of ceramics. Rheological measurements showed that ...

1995-12-01

66

High octane ethers from synthesis gas-derived alcohols

Ceramic matrix composites in the TiC-Ti, Y-TZP system can be synthesized by the reaction between carbon and the TiO_2-Y_2O_3-ZrO_2 solid solution nanopowder. This method results in the more homogeneous powders than those prepared by the physical mixing of TiC and zirconia s.s. powders. Twelve TiO_2-Y_2O_3-ZrO_2 solid solution nanopowders differing in the proportions of the constituent oxides were prepared by the coprecipitation- calcination route. They were reacted with the pyrolytic carbon evenly distributed within the system. Carbon was introduced by the thermal decomposition of the phenol-formaldehyde resin dissolved in ethyl alcohol and mixed with the zirconia s.s. nanopowder. Reaction was performed in vacuum. Compacts of the composite powders sintered in vacuum give dense materials of evenly distributed TiC inclusions of sizes not surpassing 400 nm. Hardness of such materials was dependent on their chemical and phase composition but was ...

2003-09-25

67

Suspension and solution plasma spraying of finely structured layers: potential application to SOFCs

Catalytic testing of inorganic catalysts was continued with the highly active sulfate-modified zirconia catalyst prepared here. Using isobutanol as the only reactant over this catalyst, it was demonstrated that high conversion and selectivity to isobutene was achieved at 175[degrees]C. In addition, the high selectivity to isobutene, i.e. 79--86 mol%, was maintained at higher space velocities and higher temperatures. A high productivity of 11.35 mol isobutene was achieved at 225[degrees]C. Utilizing a methanol/isobutanol = 2/1 molar ratio reactant mixture over the ZrO[sub 2]/SO[sub 4][sup 2[minus

1992-10-01

68

Two-step template-free route for synthesis of TiO2 hollow spheres

Suspension direct current plasma spraying allows achieving finely structured coatings whose thickness is between few tens and few hundreds of micrometres. Drops (200-300 ?m in diameter) or liquid jets are mechanically injected in the plasma jet. With radial injection they are rapidly (a few ?s) fragmented into droplets (a few ?m in diameter). The latter are vaporized (in a few ?s) and the solid particles contained in suspension droplets are accelerated and melted by the plasma jet. As in conventional plasma spraying (CPS), much smaller splats (with diameters between 0.2 and 3 ?m and thicknesses between 30 and 200 nm) are arranged in layers up to form the coating. The low inertia of particles requires spray distances between 40 and 60 mm which induces plasma heat fluxes up to 22 MW m-2 participating in coating densification. Even more than in CPS, the plasma jet fluctuations, particularly for plasmas containing di-atomic gases, perturb drops penetration and fragmentation. It has been ...

2007-04-21

69

British Library Electronic Table of Contents (United Kingdom)

The TiO2 hollow microspheres were prepared by microwave-assisted solvothermal treatment without template. The morphology and the phase of TiO2 hollow microspheres were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), and BET surface areas. The results show that the particles have hollow structures and the shell was covered by nanocrystals and have higher specific surface area. The possible formation mechanism of hollow TiO2 spherical structures has simply been proposed. The activity was evaluated by the photocatalytic degradation of methyl orange (MO). The results show that the particles having specific surface area show higher photocatalytic activity. It can be attribute to the doped ...

2011-01-01

70

Transport properties of single-crystalline n-type semiconducting PbTe nanowires

High capacity Si/DC/MWCNTs nanocomposite anode materials for lithium ion batteries

Single-crystalline PbTe nanowires were synthesized using the chemical vapor transport method. They consisted of rock-salt structure PbTe nanocrystals uniformly grown in the [100] direction. We fabricated field-effect transistors using a single PbTe nanowire, providing evidence for its intrinsic n-type semiconductor characteristics. The values of the carrier mobility and concentration were estimated to be 0.83 cm"2 V"-"1 s"-"1 and 8.8 x 10"1"7 cm"-"3, respectively. The Seebeck coefficients (-72 ?V K"-"1) of individual nanowires were measured to show their n-type carrier-dominated thermoelectric transport properties.

2009-10-14

71

Generation and relaxation of microstrains in GaN nanocrystals under extreme pressures

Nanocomposites comprising nanocrystal silicon (Si), disordered carbon (DC), and multi-walled carbon nanotubes (MWCNTs) - denoted as Si/DC/MWCNTs - have been prepared by pyrolyzing the phenol-formaldehyde resin (PFR) mixed with Si and MWCNTs. This nanocomposite anode material showed a discharge capacity of 1216 mAh/g in the first cycle, and a charge capacity of 711 mAh/g after 20 charge-discharge, much higher than that of Si/DC composite. It can be observed that Si particles wrapped in MWCNTs were homogeneously embedded into the matrix of the DC. The improved electrochemical performance is hypothesized to be mainly attributed to the morphology stability of the composite due to the excellent resiliency and distinct electric conductivity of the MWCNTs.

2010-03-18

72

Nanocrystalline powders of GaN with grain sizes ranging from 2 to 30 nm were examined under high external pressures by in situ diffraction techniques in a diamond anvil cell at DESY (HASYLAB, Station F3). The experiments on densification of pure powders under high pressure were performed without a pressure medium. The mechanism of generation and relaxation of internal strains and their distribution in nanoparticles was deduced from Bragg reflections recorded in situ under high pressures at room temperature. The microstrain was calculated from the full-width at half-maximum (FWHM) values of the Bragg lines. It was found that microstrains in GaN crystallites are generated and subsequently relaxed by two mechanisms: generation of stacking faults and change of the size and shape of the grains occurring under external stress. (author)

2001-09-23

73

NOx Sensor Development

Quasi-ternary nanoparticle superlattices through nanoparticle design

NO{sub x} compounds, specifically NO and NO{sub 2}, are pollutants and potent greenhouse gases. Compact and inexpensive NO{sub x} sensors are necessary in the next generation of diesel (CIDI) automobiles to meet government emission requirements and enable the more rapid introduction of more efficient, higher fuel economy CIDI vehicles. Because the need for a NO{sub x} sensor is recent and the performance requirements are extremely challenging, most are still in the development phase. Currently, there is only one type of NO{sub x} sensor that is sold commercially, and it seems unlikely to meet more stringent future emission requirements. Automotive exhaust sensor development has focused on solid-state electrochemical technology, which has proven to be robust for in-situ operation in harsh, high-temperature environments (e.g., the oxygen stoichiometric sensor). Solid-state sensors typically rely on yttria-stabilized zirconia (YSZ) as the oxygen-ion conducting ...

2010-11-01

74

Significance of microstructure for a MOCVD-grown YSZ thin film gas sensor

Individual nanoscale building blocks exhibit a wide range of size-dependent properties, since their size can be tuned over known characteristic length scales of bulk materials. In the last several years, the possibility of combining different materials in the form of two and three component nanoparticles (NPs) has been extensively explored. Also multi-component materials can be obtained via self-assembly of NPs from their binary colloidal mixtures. These new nanocrystal solids may possess tunable collective properties that originate from interactions between size and composition controlled building blocks. Exchange coupling between neighboring NPs of magnetically soft and hard materials enhances the magnetic energy product of the nanocomposite material. Randomly mixed solids of small and large semiconducting CdSe NPs revealed enhancement of photoluminescence intensity of large semiconductor particles accompanied by quenching of photoluminescence of the small ...

2007-06-19

75

Nanoporous YSZ film in electrolyte membrane of Micro-Solid Oxide Fuel Cell

The authors report the fabrication and characterization of a low temperature (200--400 C) thin film gas sensor constructed from a MOCVD-grown yttria-stabilized zirconia (YSZ) layer sandwiched between two platinum thin film electrodes. A reproducible gas-sensing response is produced by applying a cyclic voltage which generates voltammograms with gas-specific current peaks and shapes. Growth conditions are optimized for preparing YSZ films having dense microstructures, low leakage currents, and maximum ion conductivities. In particular, the effect of growth temperature on film morphology and texture is discussed and related to the electrical and gas-sensing properties of the thin film sensor device.

1996-11-01

76

Manufacturing of Austenitic Stainless Steel-Zirconia Composites by Infiltration

Yttria stabilized zirconia (YSZ) with 8 mol% Y was deposited by reactive magnetron sputtering onto oxidized (100) silicon substrates. It was possible to switch film texture from (111) to (200) by applying a strong RF substrate bias. Transmission electron microscopy showed that the film deposited under bias is porous and exhibits nanoscaled grains, whereas the film deposited without bias is dense and columnar. The ionic conductivity as a function of temperature revealed an activation energy of 1.04 eV. The mechanical stress could be tuned to low values by thermal post-annealing. Using the dense (111) film as electrolyte layer, and the porous (200) film as an interlayer to a porous Pt anode, an open circuit voltage of 0.85 V was obtained in a micro machined fuel cell structure.

2010-06-01

77

British Library Electronic Table of Contents (United Kingdom)

Abstract Within the framework of the CRC 799 -TRIP-Matrix-Composites- at the TU Bergakademie Freiberg new composite materials consisting of TRIP steel and zirconium dioxide ceramics are designed in a powder route and a casting route. To manufacture faultless samples basic investigations of the feeding and infiltration behaviour within macro porous ceramics such as filters were needed. The effects of bottom pouring and top pouring were investigated as well as the effects of different preheating temperatures, contents of phosphorous in the steel and flow trough rates. Bottom pouring corrupts the feeding mainly of filters with high ppi (pores per inch). Top pouring improves the feeding, but generates inhomogeneous infiltration qualities, which can affected and enhanced by a increasing preheat...

2011-01-01

78

Kinetic behavior of solid particle in chemical-looping combustion: suppressing carbon deposition in reduction

From porcelain-fused-to-metal to zirconia: Clinical and experimental considerations

In order to apply chemical-looping combustion to a practical power plant, carbon deposition on the solid particle is one of the key problems to be overcome. Six kinds of solid particles were examined to clarify the kinetic behavior of carbon deposition. The effects of the solid composition, feed gas composition, and reaction temperature on carbon deposition were investigated by thermogravimetrical reactor on the basis of NiO/YSZ particle. From the viewpoints of both reactivity and resistance against carbon deposition, the particle of NiO mixed with YSZ (i.e., yttria-stabilized zirconia) was found to be a good candidate for chemical-looping combustion. It has been observed that carbon deposition could be completely avoided with very low concentration of water vapor. By means of a proposed model, the condition that carbon deposition would be avoided was identified. 12 refs., 8 figs., 2 tabs.

1998-03-01

79

British Library Electronic Table of Contents (United Kingdom)

Objective.The interest of dental research in metal-free restorations has been rising in the last 20 years following the introduction of innovative all-ceramic materials in the daily practice. In particular, high strength ceramics and related CAD/CAM techniques have widely increased the clinical indications of metal-free prostheses, showing more favourable mechanical characteristics compared to the early ceramic materials.The purpose of the present paper is providing a brief review on the all-ceramic dental materials, evaluating pros and cons in the light of the most recent scientific results and of the authors? clinical experience.Materials. A structured review of the literature was given on the basis of medical and engineering papers published in the last decades on the use of dental cera...

2011-01-01

80

Ceramic Materials and Devices

Fabrication and animal experiment of nanocomposites of hydroxyapatite collagen and polysaccharides

Course website from Cambridge on ceramic materials. This site contains eight lectures in PDF format (Adobe Reader required), two question sheets, five practicals (including answers), digital movies and further useful links. "There is a strong relationship between the structure of a material and its physical properties. The properties of a material whether mechanical, electrical, optical or magnetic, determine how it can be used in practical applications. In this course, the focus is on the structure / property relationship for ionic materials with electrical properties utilised in various transducer devices. The materials considered include perovskites, which have special polarisation properties exploited in ferroelectric, pyroelectric and piezoelectric devices. Other oxides, such as zirconia, have structures permitting rapid diffusion of ions, making them suitable for use in sensors, fuel cells and batteries. The scientific principles underlying the properties of ...

2007-02-01

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81

High conductivity glass electrolytes for sodium/sulfur batteries

Four species of nanocomposites organized by hydroxyapatite (HAp), hyaluronic acid (HyA), chondroitin sulfate (ChS) and type II collagen (Col), i.e. HAp/HyA, HAp/ChS, HAp/HyA/Col and HAp/ChS/Col composites, were synthesized by coprecipitation methods. The composites could retain lots of water: 40%, 32%, 42% and 58% for the HAp/HyA, HAp/ChS, HAp/HyA/Col and HAp/ChS/Col composites, respectively. Transmission electron microscopy observations revealed that the HAp/HyA and HAp/ChS composites consisted of island-like aggregations whose sizes were 300 nm in length and 30 nm in width, and 150 nm in length and 30 nm in width, respectively. In the aggregations, there were many HAp nanocrystals of 20 nm in length, and their c-axes were aligned along the respective polymer molecules through a self-organization process. Animal tests showed that chondrocyte-like cells penetrated into the HAp/ChS/Col composites 4 weeks after implantation. It was shown that the HAp/ChS/Col ...

2001-07-01

82

Effect of various coal contaminants on the performance of solid oxide fuel cells: Part I. Accelerated testing

Sodium-ion-conducting glasses are considered a promising alternative to the ceramic electrolytes. The glass upon which the most development work has been done is a sodium borate glass, which has an ionic resistivity of about 2 x 10/sup 4/ #OMEGA#-cm at 300"0C. Because of its high resistivity, cells using this borate glass require thousands of hollow glass fibers, each about 80 micrometers outer diameter (15 micrometer wall). In spite of its greater complexity, the cell with the glass electrolyte is of interest because of its potential for lower cost and higher power than the cell with ceramic electrolyte. Recently, silicate glasses of lower resistivity have been proposed for this application. These include: a soda-alumina-silica glass (900 #OMEGA#-cm at 300"0C), a soda-zirconia-magnesia-silica glass (700 #OMEGA#-cm at 300"0C), and a soda-zirconia-silica glass (600 #OMEGA#-cm at 300"0C). These lower resistivity glasses would allow a reduction in ...

1986-06-01

83

Transesterification of palm oil and esterification of palm fatty acid in near- and super-critical methanol with SO4-ZrO2 catalysts

The contaminants that are potentially present in the coal-derived gas stream and their thermochemical nature are discussed. Accelerated testing was carried out on Ni-YSZ/YSZ/LSM solid oxide fuel cells (YSZ: yttria stabilized zirconia and LSM: lanthanum strontium manganese oxide) for eight main kind of contaminants: CH{sub 3}Cl, HCl, As, P, Zn, Hg, Cd and Sb at the temperature range of 750-850 C. The As and P species, at 10 and 35 ppm, respectively, resulted in severe power density degradation at temperatures 800 C and below. SEM and EDX analysis indicated that As attacked the Ni region of the anode surface and the Ni current collector, caused the break of the current collector and the eventual cell failure at 800 C. The phosphorous containing species were found in the bulk of the anode, they were segregated and formed ''grain boundary'' like phases separating large Ni patches. These species are presumably nickel ...

2009-09-05

84

British Library Electronic Table of Contents (United Kingdom)

Sulfated zirconia (SO4-ZrO2) catalysts, prepared with three different sulfur loading contents (0.75%, 1.8% and 2.5%) at two calcination temperatures (500degreeC and 700degreeC), were tested for use in the transesterification of purified palm oil (PPO) and the esterification of palm fatty acid (PFA) in near-critical and super-critical methanol. Techniques including BET, XRD, NH3- and CO2-TPD revealed that the sulfur content and calcination temperature strongly affects the catalyst base-acid site, specific surface area, average pore size, phase structure, and thus the catalytic reactivity. The most suitable sulfur loading content was found to be 1.8% and the optimum calcination temperature 500degreeC. The results show that the use of SO4-ZrO2 reduces esterification reaction times, the amount...

2010-01-01

85

Solid oxide fuel cells (Part 2)

High temperature electrochemical polishing of H{sub 2}S from coal gasification process streams. Quarterly progress report, October 1, 1995--December 31, 1995

The project has been developing Yttria Stabilized Zirconia (YSZ)-Alumina Composites as an electrolyte of a self-support type planar Solid Oxide Fuel Cell (SOFC) from the following points of view: a path of alumina particles with high thermal conductivity can be designed as an electrolyte sheet; there are some possibilities that the electrolyte can be enhanced in mechanical strength. As previously reported, these composite materials have higher mechanical strength and better thermal shock resistance than those of YSZ. These composites containing 0-30 wt% of Al[sub 2]O[sub 3] were measured by AC impedance method at temperatures of 250-1,000[degree]C. Electrical conductivities of 8YSZ without Al[sub 2]O[sub 3] and a composite consisting of 80 wt% YSZ and 20 wt%Al[sub 2]O[sub 3] as sintered samples were 1.2 x 10[sup -1]S/cm and 1.0 x 10[sup -1]S/cm respectively at 1,000[degree]C. The composite containing 20 wt% of Al[sub 2]O[sub 3] is the most promising candidate ...

1993-01-01

86

Glass-ceramic sealants for solid oxide fuel cells: Part I. Physical properties

An advanced process for the separation of hydrogen sulfide (H{sub 2}S) from coal gasification product streams through an electrochemical membrane is being developed. H{sub 2}S is removed from the syn-gas stream, split into hydrogen, which enriches the exiting syn-gas, and sulfur, which is condensed from an inert sweep gas stream. The process allows removal of H{sub 2}S without cooling the gas stream and with negligible pressure loss through the separator. The process is made economically attractive by the lack of need for a Claus process for sulfur recovery. Membrane manufacturing coupled with full-cell experimentation was the primary focus this quarter. A tape-casted zirconia membrane was developed and utilized in one full-cell experiment (run 25); run 24 utilized a fabricated membrane purchased from Zircar Corporation. Results are discussed.

1995-12-31

87

Experimental investigation of premixed combustion within highly porous media

A family of sealant materials has been developed for use in the solid oxide fuel cell (SOFC) and in other applications in the temperature range of 800 endash 1000 degree C. These materials are based on glasses and glass-ceramics in the SrO endash La_2O_3 endash Al_2O_3 endash B_2O_3 endash SiO_2 system. The coefficients of thermal expansion (CTE) for these materials are in the range of 8 endash 13x10"-"6/degree C, a good match with those of the SOFC components. These sealant materials bond well with the ceramics of the SOFC and, more importantly, form bonds that can be thermally cycled without failure. At the fuel cell operating temperature, the sealants have viscosities in the range of 10"4-10"6 Pa-s, which allow them to tolerate a CTE mismatch of about 20% among the bonded substrates. The gas tightness of a sample seal was demonstrated in a simple zirconia-based oxygen concentration cell. copyright 1996 Materials Research Society.

88

Dielectric properties of fluxed barium titanate ceramics with zirconia additions

This paper reports on an experimental investigation of premixed methane/air combustion stabilized within a reticulated partially stabilized zirconia foam burner that was performed. A flame holder was used to extend the stability range to allow a stable flame to be maintained for a variety of flow rate and equivalence ratio combinations. The stability range, temperature distributions, and emissions were examined over a range of equivalence ratios and flow rates. The flame was found to be axisymmetric for all conditions in which the reactants were sufficiently well mixed and the flow distribution was sufficiently uniform. Burning speeds were measured that were well in excess of the laminar flame speed. The axial temperature distribution (measured around the burner annulus) in the postflame zone was found to be relatively insensitive to flow rate but dependent upon the burner core length. Very low concentrations of NO_x were found for fuel/air equivalence ratios of ...

1991-03-17

89

Dielectric properties of fluxed barium titanate ceramics with zirconia additions

BaTiO{sub 3} compacts, when fluxed with {lt} 2 vol% of a complex borate glass phase, were sintered to near theoretical density at temperatures {lt} 1175{degrees}C in 2 h. Microstructural analysis showed a uniform grain size {lt} 1.0 {mu}m with 0.75 wt% ZrO{sub 2} added to the flux phase as a grain growth inhibitor. TEM analysis revealed a microcrystalline grain-boundary phase with the ZrO{sub 2} resident along the grain boundaries. These samples displayed an essentially flat dielectric profile, low dissipation factors ({lt} 2%) over the range 25{degrees} to 125{degrees}C, a near linear dependence ({approx} {+-} 15%) between 25{degrees} and {minus} 55{degrees}C, and significantly increased voltage stability. X-ray diffraction analysis of these small-grained materials indicates a suppression of the tetragonal structure toward a more cubic modification.

1990-03-01

90

Design of experiment approach applied to reducing and oxidizing tolerance of anode supported solid oxide fuel cell. Part II: Electrical, electrochemical and microstructural characterization of tape-cast cells

BaTiO_3 compacts, when fluxed with < 2 vol% of a complex borate glass phase, were sintered to near theoretical density at temperatures < 1175 degrees C in 2 h. Microstructural analysis showed a uniform grain size < 1.0 #mu#m with 0.75 wt% ZrO_2 added to the flux phase as a grain growth inhibitor. TEM analysis revealed a microcrystalline grain-boundary phase with the ZrO_2 resident along the grain boundaries. These samples displayed an essentially flat dielectric profile, low dissipation factors (< 2%) over the range 25 degrees to 125 degrees C, a near linear dependence (#approx# #+-# 15%) between 25 degrees and - 55 degrees C, and significantly increased voltage stability. X-ray diffraction analysis of these small-grained materials indicates a suppression of the tetragonal structure toward a more cubic modification.

91

British Library Electronic Table of Contents (United Kingdom)

One of the major limitations of the nickel (Ni) - yttria-stabilized zirconia (YSZ) anode support for solid oxide fuel cells (SOFC) is its low capability to withstand transients between reducing and oxidizing atmospheres (''RedOx'' cycle), owing to the Ni-to-NiO volume expansion. This work presents results on different anode supports fabricated by tape casting. Three compositions are prepared, as the outcome of a preceding design of experiment approach. The NiO proportion is 40, 50 and 60wt% of the anode composite. The anode support characteristics like shrinkage during sintering, in-situ conductivity at high temperature, electrochemical performance and tolerance against RedOx cycles have been measured. Performance up to 0.72Wcm^-^2 (0.62V, 800^oC) is recorded for the 60wt% NiO sample on sm...

2011-01-01

92

Thermal stability of nanocomposite CrC/a-C:H thin films

Nanocrystalline doped cerium oxide as a catalyst for SO{sub 2} reduction by CO

The thermal stability of low-friction Me-C/a-C:H coatings is important for their potential applications in the tool and automotive industry. Recently we showed that CrC _x/a-C:H coatings prepared by unbalanced magnetron sputtering of a Cr target in Ar + CH_4 glow discharges exhibit a nanocomposite structure where metastable fcc CrC nanocrystals are encapsulated by an a-C:H phase. Here, we present the structural evolution of these nanocomposite CrC/a-C:H coatings during annealing. High-temperature X-ray diffraction in vacuum and differential scanning calorimetry (DSC) combined with thermo-gravimetric analysis in Ar atmosphere indicate decomposition of the formed metastable fcc CrC phase and subsequent formation of Cr_3C_2 and Cr_7C_3 and structural transformation of the a-C:H matrix phase towards higher sp"2 bonding contents at temperatures above 450 deg. C. Combined DSC and mass spectrometer analysis as well as elemental profiling after annealing in vacuum by ...

2007-05-07

93

A simple template-free approach to TiO2 hollow spheres with enhanced photocatalytic activity.

Nanocrystalline processing by inert gas condensation has the inherent advantages of generating: (1) high surface area nanoclusters, (2) non-stoichiometric oxides, and (3) high dispersions of dopants. This approach is exploited in the synthesis of fluorite-structured catalysts for SO{sub 2} reduction by CO. Nanocrystalline CeO{sub 2{minus}x}, La-doped CeO{sub 2{minus}x}, and Cu-doped CeO{sub 2{minus}x} were produced by magnetron sputtering from a pure or mixed metal target, followed by controlled oxidation of the metallic clusters. The as-prepared doped and undoped nanocrystalline CeO{sub 2{minus}x} materials were found to be excellent catalysts for complete SO{sub 2} conversion to elemental sulfur. Undoped nanocrystalline CeO{sub 2{minus}x} enabled light-off at 460 C, a temperature {approximately} 120 C lower than that over polycrystalline CeO{sub 2}, which is a novel effective catalyst itself. The high catalytic activity of the nanocrystals was associated with ...

1994-12-31

94

The study of mountain conservation and utilization

Mesporous anatase-phase TiO(2) hollow spheres with high photocatalytic activity were prepared by hydrothermal treatment and self-transformation of amorphous TiO(2) solid spheres in an NH(4)F aqueous solution. The prepared samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, N(2) adsorption-desorption isotherms and UV-vis absorption spectroscopy. The photocatalytic activity was evaluated by photocatalytic oxidation decomposition of acetone in air under UV irradiation. It is found that F(-) plays an essential role in the formation of TiO(2) hollow spheres. F(-) not only induces the hollowing of TiO(2) solid spheres, but also promotes the crystallization of anatase TiO(2) nanocrystals. A possible formation mechanism for the TiO(2) hollow spheres by localized Ostwald ripening or chemically induced self-transformation is proposed based on the experimental observations. Furthermore, the molar ...

2010-05-27

95

The Study on the Health of Aroma Therapeutist

Full Text Available

2003-02-01

96

Studies on microsynthesis of new compounds of iron

Full Text Available

2008-02-01

97

Natural analogue study of Oklo

Short communication.

1994-06-01

98

Heart & Diabetes - Feasibility Study

No abstract prepared

1998-01-01

99

A study of nurse administrators' political participation.

Acute Heart Failure

2011-05-11

100

A study of neutron transmutation doped germanium

PMID:6551109

1983-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

101

A study of dietetic on the diarrhea

No abstract prepared

1998-01-01

102

knee MRI Study of Normal Cruciate Ligaments Comparing the Flexion Images with the Extension Image : Preliminary Study

Full Text Available

2006-06-01

103

The study of antiprotons and positrons in cosmic rays with the PAMELA spectrometer

Full Text Available

1996-08-01

104

Studies on the Permeability to Lipids and Lipoproteins of ...

The study of antiprotons and positrons in cosmic rays with the PAMELA spectrometer

1998-01-01

105

ELECTRON MICROSCOPE STUDIES INTO THE ...

... Accession Number : AD0769178. Title : Studies on the Permeability to Lipids and Lipoproteins of Inflamed Skin Capillaries,. ...

106

Design and Analysis of Vaccine Studies Questions of Analysis, Geometry & Algorithmics

ELECTRON MICROSCOPE STUDIES INTO THE MORPHOLOGY AND LOCALIZATION OF OMSK HEMORRHAGIC FEVER VIRUS IN INFECTED ...

1966-08-01

107

In vivo range of motion of the lumbar spinous processes

Design and Analysis of Vaccine Studies

2010-01-01

108

[Physiologic and pathologic experimental models for studying cholangiocytes

The study design included an in vivo laboratory study. The objective of the study is to quantify the kinematics of the lumbar spinous processes in asymptomatic patients during un-restricted functional...Full Text Available

2009-09-01

109

The study on the methods of environmental monitoring using NAA

Full Text Available

2008-06-01

110

The development of contemporary chiropractic education in Denmark: an exploratory study

No abstract prepared

1998-01-01

111

Teratogenicity Study of tert-Butyl Acetate in Rats

Udgivelsesdato: 2008-Oct

2008-01-01

112

Survey Studies on the Korean Dietary Life of Red Pepper

Full Text Available

2007-06-01

113

Study on body composition for the control of efficacy of full parenteral nutrition

Full Text Available

1977-03-01

114

Study on Designing Recoil System with Friction Springs

Short note.

115

Study of the Presence of Residual Hexane in Olive Oils

Full Text Available

2011-04-01

116

Study of quantum chemical calculation of actinide compounds

Full Text Available

2006-12-01

117

Study of cement matrices for the immobilization of evaporator concentrates

No abstract prepared

1998-01-01

118

Study of Tibial Shaft Fractures in Children

No abstract prepared

1998-12-31

119

Study of Sorafenib and Gemcitabine in Advanced Hepatocellular Carcinoma (HCC)

Tibial Shaft Fractures in Children

2010-11-09

120

Studies on the Processing of Seasoned Product Containing Egg Yolk.

Hepatocellular Carcinoma

2009-02-13

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

121

Studies on the Effect of Spices and Flavoring on Ascorbic Acid content

Full Text Available

1988-03-01

122

Studies on movements and interchanges of Kimchi in China, Korea and Japan

Full Text Available

1974-03-01

123

Studies on Polyacrylonitrile (3) Irradiation of Polyacrylonitrile

Full Text Available

1975-04-01

124

Studies on Cnidium officinale As Natural Spices

Full Text Available

1967-06-01

125

Studies of deposits formed from thermally stressed jet fuels

Full Text Available

2002-02-01

126

Studies of High-K Isomers at TRIUMF-ISAC

No Abstract Available

1983-01-01

127

Structure studies of acidic galactan from Pomacea sp

No abstract prepared.

2004-03-04

128

Radiation processing technology for cosmetics: a report on a canadian study

No abstract prepared.

2006-07-01

129

Proteomics of Severe Traumatic Brain Injury: A Feasibility Study

Short communications only.

1992-09-13

130

Plasma nitriding of ASTM F138 biomaterial - corrosion study

Brain Injuries, Traumatic

2009-02-20

131

Parametric study of lateral stability for a railway vehicle

No abstract prepared.

2006-07-01

132

Numerical Study of Heat Transfer Augmentation of Viscous Flow in Corrugated Channels

Full Text Available

2011-07-01

133

NMR spectroscopy study of serum lipids from HIV patients

Not Available

2000-10-01

134

Model System for Mechanistic Study of Catalytic Bleaching of Cotton

Short communication.

1996-12-31

135

Kelvin and Stokes a comparative study in Victorian physics

Full Text Available

2010-02-01

136

Gestational Diabetes Follow Up Study

Kelvin and Stokes

1987-01-01

137

Gas chromatographic studies of molybdenum oxides and hydroxides

Diabetes, Gestational; Postpartum Period

2009-10-19

138

Exploratory Study on the Social Responsibility of Fashion Brands

Short communication.

1993-05-01

139

Experimental and numerical study of colloid transport in a single fracture.

Full Text Available

2009-12-01

140

Experimental Study of Assembly Clamping Pressure on Performance of PEM Fuel Cells

No abstract prepared.

2005-02-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

141

Eta-nucleus final state interaction studies

Not Available

2010-12-01

142

Eta-nucleus bound state study and the detector ENSTAR

No abstract prepared.

2002-03-01

143

Densification study of #beta#-Sialon with yttrium concentrates addition

No abstract prepared.

2002-03-01

144

Corrosion and histopathological studies on anode materials for implantable power sources. [In vivo corrosion studies on anode material

Short communication.

145

Causes of Fever in the ICU - A Prospective, Cohort Study

The biocompatibility and corrosion resistance of various materials for use as sacrificial anodes in in vivo hybrid fuel cells were studied. Aluminium, zinc, and magnesium alloy AZ31B were studied, and the results are discussed.

1974-01-01

146

Automated Real-time Feedback on CPR Study

Full Text Available

2008-06-01

147

Archaeoseismological studies on historical heritage sites in the Gyeongju area, SE Korea

Heart Arrest

2010-07-20

148

Application of photoacoustic techniques to the study of jet fuel residue

Not Available

2011-10-01

149

An X-ray and neutron reflectometry study of multilayers

No Abstract Available

1983-01-01

150

An Ocean - Atmosphere Coupled Model for the Study of ENSO

No abstract prepared.

1998-09-01

151

An Experimental Study on MRI Signal Intensity of Albumin Solution

Full Text Available

1994-06-01

152

A study on dietary culture in Nara Dynasty in JAPAN

Full Text Available

1990-02-01

153

A photographic study of arc spectra / by Caroline Willard Baldwin.

Full Text Available

1997-06-01

154

A congenital lethal form of hypophosphatasia: histologic and ultrastructural study.

Language: English ...

155

A Study on the melting Characteristics of Fuse Element by Repeating Overcurrent

PMID:8677780

1996-05-01

156

A Study on the Preparation of Tritium Luminous Compound

Full Text Available

2010-02-01

157

A Study on the Model of Sulfidation Kinetics Using Seashell Wastes

Full Text Available

1972-12-01

158

A Study on the Knowledge of Immigrant Housewives on Infant Weaning

Full Text Available

2004-12-01

159

A Study on the Convergence of the Evolution Strategies based on Learning

Full Text Available

2011-02-01

160

A Study on the Characteristics of Beach Sand as Fine aggregate of Concrete

Full Text Available

1999-12-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

161

A Study on Success Factors for Entrepreneurs in IT Ventures

Full Text Available

1976-12-01

162

A Study on Functionality of Fashion Design Combined with Technology

Full Text Available

2010-07-01

163

A Study on Evaluation Scheme for Exchangeable CAS (XCAS)

Full Text Available

2004-01-01

164

A Study of LY2541546 in Women With Low Bone Mineral Density

Full Text Available

2010-10-01

165

A Study of Baldwin-Lomax Model in Supersonic Flows

Osteoporosis

2011-09-16

166

A Feasibility Study of Smoking Cessation Program in Radiation Oncology

Full Text Available

1997-06-01

167

Mathematical Modeling and Optimization Studies on ...

Cancer and Tobacco Abuse

2007-10-29

168

An Experimental Study on Magnetic Resonance Imaging of Hematoma Part I : An Expeimental Study on Magnetic Resonance Imagingof Blood

... 1]. Results and Discussion A cross section of liquid feed direct borohydride fuel cell model was created and studied. The ...

2010-05-12

169

A Study of the Geographic Origin, Education, and Experience ...

Full Text Available

1987-06-01

170

The use of healthy volunteers instead of patients to inform drug dosing studies: a [11C]raclopride PET study

... by starting and remaining in that size hotel. Another early study, conducted by Nailon (1968) sampled three general managers ...

1993-04-01

171

British Library Electronic Table of Contents (United Kingdom)

Rationale Receptor occupancy study has been performed to evaluate pharmacokinetic profiles in new antipsychotic drug development. While these findings highlight the value of positron emission tomography (PET) for dose-finding study, what is unclear is if it is necessary to conduct these studies in patients with schizophrenia or whether studies in healthy volunteers are adequate. Objectives To determine if it is necessary to conduct dopamine receptor occupancy studies in patients with schizophrenia or whether studies in healthy volunteers are adequate for dose-finding study, we compared the concentration?occupancy relationship in terms of EC50 between patients and healthy volunteers. Methods Ten healthy volunteers and eight patients with schizophrenia participated in the study. We measured ...

2011-01-01

172

Methodological Quality of Studies on the Measurement Properties of Neck Pain and Disability Questionnaires: A Systematic Review

British Library Electronic Table of Contents (United Kingdom)

Objective: The aim of this study was to obtain an overview of the methodological quality of studies on the measurement properties of neck pain and disability questionnaires and to describe how well various aspects of the design and statistical analyses of studies on measurement properties are performed. Methods: A systematic review was performed of published studies on the measurement properties of neck pain and disability questionnaires. Two reviewers independently rated the quality of the studies using the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN) checklist. This checklist was developed in an international Delphi consensus study. Results: A total of 47 articles were included on the measurement properties of 8 different questionnaires. The meth...

2011-01-01

173

(Feasibility study of the San Lorenzo River hydroelectric project)

Using microarrays to identify positional candidate genes for QTL: the case study of ACTH response in pigs

I travelled to San Jose, Costa Rica on July 8, 1990 to evaluate all of the completed elements of the ongoing feasibility study for the San Lorenzo River hydroelectric project. The feasibility study is being supported by ORNL under the Renewable Energy Applications and Training Project. The project is being studied for implementation by CONELECTRICAS, a consortium of rural electric cooperatives and the study itself is being conducted by BEL Engineering, a Costa Rican consulting firm under contract to CONELECTRICAS, USAID/PIC and NRECA.

1990-07-19

174

Using Geographic Information Systems for Exposure Assessment in Environmental Epidemiology Studies

BackgroundMicroarray studies can supplement QTL studies by suggesting potential candidate genes in the QTL regions, which by themselves are too large to provide a limited selection...Full Text Available

175

Toxicity and carcinogenicity studies of boric acid in male and female B6C3F1 mice.

Geographic information systems (GIS) are being used with increasing frequency in environmental epidemiology studies. Reported applications include locating the study population by geocoding addresses...Full Text Available

2004-06-01

176

Theoretical Study of Tautomerization Reactions for the Ground and First Excited Electronic States of Adenine.

Toxicity and potential carcinogenicity studies of boric acid were investigated in mice to verify in a second rodent species that this was a noncarcinogenic chemical. Earlier chronic studies in rats...Full Text Available

1994-11-01

177

The Comprehensive Dialysis Study (CDS): A USRDS Special Study

Geometrical structures and energetic properties for different tautomers of adenine are calculated in this study, using multi-configurational wave functions. Both the ground and the lowest singlet excited state potential energy surfaces are studied. Four t...

2002-01-01

178

Study protocol. A prospective cohort study of unselected primiparous women: the pregnancy outcome prediction study

Background and objectives: The Comprehensive Dialysis Study (CDS) aimed to understand factors contributing to physical, functional, and nutritional health status among patients starting dialysis.Design,...Full Text Available

2009-03-01

179

Socio-demographic disparity in oral health among the poor: a cross sectional study of early adolescents in Kilwa district, Tanzania

BackgroundThere have been dramatic changes in the approach to screening for aneuploidy over the last 20 years. However, the approach to screening for other complications of pregnancy...Full Text Available

180

Prevalence of Ocular Fundus Pathology in Patients with Chronic Kidney Disease

BackgroundThere is a lack of studies considering social disparity in oral health emanating from adolescents in low-income countries. This study aimed to assess socio-demographic...Full Text Available

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181

Multicenter Case-Control Study on Restless Legs Syndrome in Multiple Sclerosis: the REMS Study

Background and objectives: The objective of this study was to describe the prevalence of ocular fundus pathology in the Chronic Renal Insufficiency Cohort (CRIC) study, a multicenter, longitudinal study...Full Text Available

2010-05-01

182

Most Antidepressant Use in Primary Care Is Justified; Results of the Netherlands Study of Depression and Anxiety

Study objectives:To verify the existence of a symptomatic form of restless legs syndrome (RLS) secondary to multiple sclerosis (MS) and to identify possible associated risk factors.Design:Prospective,...Full Text Available

2008-07-01

183

Molecular and clinico-pathological markers in rectal cancer: a tissue micro-array study

BackgroundDepression is a common illness, often treated in primary care. Many studies have reported undertreatment with antidepressants in primary care. Recently, some studies also...Full Text Available

184

Measuring quality of care in psychiatric emergencies: construction and evaluation of a Bayesian index.

AimsThe aims of the study were to study the effect of pre-operative treatment on the expression of tumour-related proteins and to correlate the expression of these...Full Text Available

2009-02-01

185

Gender differences in disability after sickness absence with musculoskeletal disorders: five-year prospective study of 37,942 women and 26,307 men

OBJECTIVE. This study was conducted to determine whether an index for measuring quality of care for psychiatric emergencies is reliable and valid. DATA SOURCES/STUDY SETTING. The study used primary...Full Text Available

1993-06-01

186

Exposure to dioxin and nonneoplastic mortality in the expanded IARC international cohort study of phenoxy herbicide and chlorophenol production workers and sprayers.

BackgroundGender differences in the prevalence and occupational consequences of musculoskeletal disorders (MSDs) are consistently found in epidemiological studies. The study investigated...Full Text Available

187

Electrophysiological Study and Catheter Ablation with 3D Mapping

The authors studied noncancer mortality among phenoxyacid herbicide and chlorophenol production workers and sprayers included in an international study comprising 36 cohorts from 12 countries followed...Full Text Available

1998-04-01

188

Medline Plus

... see and electrophysiological study and catheter ablation with 3D mapping. During the procedure, doctors look at the ... perform a electrophysiology study with ablation, using our 3D mapping system. Keep in mind, that during the ...

189

Dietary factors related to body weight in adult Vietnamese in the rural area of Haiphong, Vietnam: the Korean Genome and Epidemiology Study (KoGES)

Design and Operating Parameters for Emission Control Studies: ASARCO, El Paso, Copper Smelter.

The objectives of this study were to examine the association between dietary factors and underweight and overweight adult Vietnamese living in the rural areas of Vietnam. A cross-sectional study of...Full Text Available

2010-06-01

190

Delineation of the Middle Longitudinal Fascicle in Humans: A Quantitative, In Vivo, DT-MRI Study

The report gives background design data for a specific copper smelter. The data is sufficiently detailed to allow air pollution control system engineering studies to be conducted. These studies will be concerned primarily with lean SO2 streams that curren...

1976-01-01

191

A critical review of studies of the association between demands for hospital services and air pollution.

Experimental and imaging studies in monkeys have outlined various long association fiber bundles within the temporoparietal region. In the present study the trajectory of the middle longitudinal fascicle...Full Text Available

2009-04-01

192

The implications of tolerance system interpretation on past and present dimensional variability studies

Studies of the associations between air pollution and hospital admissions and emergency room use are reviewed, including studies of air pollution episodes, time-series analyses, and cross-sectional...Full Text Available

1993-07-01

193

Conditional risk assessment of SNR 300 in case of an unprotected loss of flow accident

Dimensional variability studies and published dimensional variability standards have been used by the foundry industry for years as an indicator of the casting process` ability to produce uniform parts. These studies are an extremely useful tool in the continuous ``dimensional dialogue`` between foundries and customers. The nature of these studies, and of the current tolerancing systems used by casting designers, leaves room for some misinterpretation and misuse of these study results. This paper contains two important discussions. The first part explains exactly what these studies represent. Following this is a brief explanation on dimensional and geometric tolerances and how they communicate dimensional requirements.

1994-12-31

194

Chernobyl Studies Project. Working Group 7.0, environmental transport and health effects. Progress report, February 1994

This paper gives a summary of a risk study assuming unprotected loss of flow (ULOF) in the SNR 300. This study was initiated in 1979/80 by the Karlsruhe Nuclear Research Center and performed in close cooperation with Science Applications Inc., Palo Alto, USA, and Interatom Company. Part of the results also was integrated in the 'Risk Related Analysis for the SNR 300' carried out by the Gesellschaft fuer Reactorsicherheit. The character of the study described here is similar to other risk studies like the Reactor Safety Study and the German Risk Study for Nuclear Power Plants. The objectives and the methodology of the analyses are described and its results are discussed. (orig./RW).

195

Study of the Electron Beam Dynamics in the Fermi @ Elettra Linac

The focus of the Chernobyl Studies Project has now turned to the issue of health effects from the Chernobyl accident. Currently, we are involved in and making progress on the case-control and co-hort studies of thyroid diseases among Belarussian children. Dosimetric aspects are a fundamental part of these studies. We are working to implement similar studies in Ukraine. A major part of the effort of these projects is supporting these studies, both by providing methods and applications of dose reconstruction and by providing support and equipment for the medical teams.

1994-04-01

196

Study of the Electron Beam Dynamics in the FERMI @ ELETTRALinac

A study of the electron beam dynamics in the linac is conducted for the FERMI free electron laser (FEL) founded for construction at the Sincrotrone Trieste.

2006-07-19

197

Studies for the Synthesis of Xenicane Diterpenes. A Stereocontrolled Total Synthesis of 4-Hydroxydictyolactone

A study of the electron beam dynamics in the linac is conducted for the FERMI free electron laser (FEL) founded for construction at the Sincrotrone Trieste

2006-06-17

198

Prognostic Factors for Failure after Prostatectomy

The stereocontrolled total synthesis of 4-hydroxydictyolactone (4), a member of the xenicane diterpene family of natural products, is described. These studies feature the development...Full Text Available

2009-07-01

199

Prediction accuracy of a sample-size estimation method for ROC studies

Several randomized studies have been completed in prostate cancer that show a benefit to immediate postoperative treatment in patients undergoing prostatectomy. In one of the studies, there was even...Full Text Available

200

Periodontal disease and spontaneous preterm birth: a case control study

Rationale and ObjectivesSample-size estimation is an important consideration when planning a receiver operating characteristic (ROC) study. The aim of this work was...Full Text Available

2010-05-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

201

Packaging, Storage, and Containerization Center: Reports ...

BackgroundSeveral studies have suggested an association between periodontal disease and prematurity but this finding has not been consistently observed.MethodsCase...Full Text Available

202

Naltrexone and Combined Behavioral Intervention Effects on Trajectories of Drinking in the COMBINE study

... 9 SIMPLIFICATION STUDY RECOMMENDATIONS - MIL-STD-2073-1/2 ... SIMPLIFICATION STUDY RECOMMENDATIONS - MIL-STD-2073-1/2 ...

1993-12-01

203

ObjectiveCOMBINE is the largest study of pharmacotherapy for alcoholism in the United States to date, designed to answer questions about the benefits of combining...Full Text Available

2010-03-01

204

Lunar Geology

In-situ micro-FTIR study of thermal changes of organics in Tagish ...

Lunar Geology is the study of the moons crust, rocks, strata, etc. Lunar Geology tends to cover two broad areas of study; Maria (and/or Basins) and Highlands. ...

205

If I Had - A Family Member with Metabolic Syndrome

FT-IR spectroscopic studies of major organic matter in carbonaceous chondrites using microscopic technique and comparison with terrestrial kerogen. ...

206

Medline Plus

... elevated blood sugar levels, but not full-blown diabetes. What are the keys to preventing the disease? ... been well studied, in a study called The Diabetes Prevention Program, in several thousand people with this ...

207

Fundamental study of heat transfer augmentation of tube inside surface by cascade smooth surface-turbulence promoters

Flue gas desulfurization pilot study: summary of phase I and phase II reports

Fundamental study of heat transfer augmentation of tube inside surface by cascade smooth surface-turbulence promoters

1987-03-01

208

Field studies among diverse biomes demonstrate that nitrogen ...

The initial phase of this study consisted of a survey of existing FGD systems used on larger combustion processes in the NATO countries and Japan.

1980-04-01

209

Effects of phenoxybenzamine on bladder neck opening1

Field studies among diverse biomes demonstrate that nitrogen concentration (% N) at leaf- and canopy-scales is strongly related to carbon uptake and cycling ...

210

ESR study in radiation damage in pyrimidines. 3-year comprehensive progress report

A study of the effects of the action of phenoxybenzamine on bladder neck opening during micturition is reported. Twenty patients with symptoms of prostatism but minimal prostatic enlargement were studied....Full Text Available

1980-05-01

211

Coccygectomy with or without periosteal resection

General mechanisms of radiation damage to biomolecules was studied by using substituted pyrimidines, particularly barbituric acid derivatives.

212

Department of the

Wastenet

Waste Technology and Innovation Study Final Report ...Waste Technology and Innovation Study Final Report 21/18569/150554 ...Survey of waste and resource recovery related technology and innovation, including products and product uses

213

Clinical Investigation Program, Reports Control Symbol MED ...

The purpose of this study was to compare the clinical outcomes and wound complications in coccygectomy with or without subperiosteal resection. This retrospective study included 25 patients who underwent...Full Text Available

2010-04-01

214

Biomarker studies in northern Bohemia.

... POG Cook, BA A Case Control Study of Childhood 147 8552(85) Rhabdomyosarcoma (0) POG COOK, BA Phase II Study of 6-Mercaptopurine ...

1988-10-01

215

Alternative fuel trucks case studies: Running line-haul trucks on ethanol

Studies were conducted in northern Bohemia to simultaneously evaluate personal exposures to air pollution in the form of respirable particles containing polycyclic aromatic hydrocarbons (PAHs) and biomarkers...Full Text Available

1996-05-01

216

This bulletin describes case studies of trucks operating on ethanol fuel. Cost, maintenance and repair, as well as fuel economy are discussed.

1996-10-01

217

Winter Air Quality Study

Ultrafast Nonadiabatic Dynamics. Theoretical Study of Femtosecond Electron Transfer Processes.

... 15 minutes Time lapse video Time Lapse Recorder (Panasonic) SVHS 4-seconds

218

Czech Academy of Sciences Repository

Full Text Available

1998-01-01

219

Twin Cities Army Ammunition Plant soil vapor extraction system : a post-audit modeling study.

Treating disaster as a development opportunity : a study of earthquake recovery in Sichuan

No abstract prepared.

2000-11-27

220

Norwegian Open Research Archives (NORA)

Full Text Available

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

221

The studying of electron motion in crystal lattice by using computer

The progression from ionic to covalent bonding in disordered systems as studied by using neutron diffraction

... 2007, 80 ?. 5. ?????? ?.?. Visual Basic-6.0, ??????, 2000, 449 ?. ????

2010-04-01

222

The human melanocyte: A model system to study the complexity of cellular aging and transformation in non-fibroblastic cells

No abstract prepared

1998-12-31

223

The beginning of a new science

No abstract prepared.

2002-05-23

224

The Study on Application of Fast Track Method for Dam Project Life Cycle?s Analysis

The evolution of the study of extra-terrestrial neutrinos over the 45 years since their discovery.

225

The Study on Application of Circuit Breaker without Closing Resistor in Short Transmission Line

Full Text Available

2003-10-01

226

The Application of Diffusion Approximations to the Study of ...

Full Text Available

2004-01-01

227

Suppression of Magnetization Ringing After Domain Wall Collision Studied by Micromagnetic Simulation

... Descriptors : *QUEUEING THEORY, *APPROXIMATION ... MODELS, OPTIMIZATION, STOCHASTIC PROCESSES ... Categories : TERMINAL FLIGHT ...

228

Study on the interactions between ginsenosides and lysozyme under acidic condition by ESI-MS and molecular docking

Full Text Available

2008-12-01

229

Study on the ageing process of the proportional counters; Badanie mechanizmu starzenia licznikow proporcjonalnych

Not Available

2011-02-01

230

Study on the Development of Solid Fuel of Animal Wastes for Heating of Agricultural Facilities

No abstract prepared

1998-12-31

231

Study on a limiting sensitivity of a betatron introscope

Full Text Available

2007-10-01

232

Study on Present Status of Poultry Farming and Improvement of Technical Management for Poultry Production

1975. USSR Zabrodskij, VA Nedavnij, SN INIS-mf--3677. Available from

1975-09-03

233

Study on Manufacturing and Characteristics of Phase Change Materials for Having Latent Heat

Full Text Available

1981-10-01

234

Study on Fatigue Property of Material for Oil Hydraulic Piston Pump

Full Text Available

2006-06-01

235

Study of the Form Factor of the Proton in the Timelike Region for Large Momentum Transfers

Full Text Available

2011-05-01

236

Study of nuclear fusion materials making use of ion irradiation and ESR microscope

No abstract prepared.

2001-01-01

237

Study of Tumor Tissue Samples From Patients With Stage I, Stage II, or Stage III Malignant Melanoma

No abstract prepared

1998-01-01

238

Study of Heat Transfer Augmentation in a High-Temperature Field by a Radiation Promoter Generating a Secondary Flow

Melanoma (Skin)

2011-07-20

239

Study of Electromagnetic Wave Absorption Properties with Particle Size in Soft Magnetic Alloy Powder

Not Available

1999-01-01

240

Studies on the application of petroleum coke as a component of coal blends for metallurgical coke

Full Text Available

2007-08-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

241

Studies on the Lipase Activity and Lipid Components of the Molded Sardine Meal 'Koji'

Short communication.

1994-12-31

242

Studies on the Distribution of the Microalgae in the Tidal Flats of Gamami Beach, Young-Gwang, Korea

Full Text Available

1994-09-01

243

Studies on structural integrity of polyester-cotton friction spun yarn by cycling extension test

Full Text Available

2003-07-01

244

Studies on a Novel Polyacrylonitrile Copolymer/Cellulose Acetate Blending Water Absorbency Fiber

Full Text Available

245

Studies on Vegetation for Ecological Restoration of Salt Marshes in Saemangeum Reclaimed Land - Germination Strategies and Character of Halophytes -

Full Text Available

2010-09-01

246

Studies on Oleoresin Product from Spices 3. Rapid Processing of Garlic Oleoresin

Full Text Available

2009-04-01

247

Studies on Oleoresin Product from Spices 2. Quality Stability of Red Pepper Oleoresin

Full Text Available

1993-02-01

248

Studies on Oleoresin Product from Spices 1. Extraction of Red Pepper Oleoresin

Full Text Available

1991-12-01

249

Studies on Flora of Wetlands on Jeju City for Application as Nature Exploration Sites

Full Text Available

1991-12-01

250

Studies of {eta} production in proton proton collisions with the time of flight spectrometer

Full Text Available

2009-04-01

251

Studies of inactivation, retardation and accumulation of viruses in porous media by a combination of dye labeled and native bacteriophage probes

No abstract prepared.

2002-03-01

252

Studies in crystal structure and luminescence properties of Eu3+-doped metal tungstate phosphors for white LEDs

Not Available

2011-06-01

253

Structure beyond Bragg : study of V{sub 2}O{sub 5} nanotubes.

Not Available

2011-12-01

254

Small Angle Neutron Scattering and Calorimetric Studies of Large Unilamellar Vesicles of the Phospholipid Dipalmitoylphosphatidylcholine

No abstract prepared.

2004-02-01

255

Sensitivity study of frictional behavior by dimensional analysis in cold forging

No abstract prepared.

1999-03-01

256

SYNCHROTRON X-RAY DIFFRACTION STUDY OF THE STRUCTURE AND DEHYDRATION BEHAVIOR OF TODOROKITE

Full Text Available

2010-01-01

257

STRUCTURAL CHARACTERIZATION OF THIN HYDROXYPROPYLCELLULOSE FILMS. X-RAY REFLECTIVITY STUDIES

No abstract prepared.

2003-01-01

258

SAXS studies of the injection molding effects on the nanostructure of polyesters. I. Polybutylene terephthalate (Pbt)

No abstract prepared.

2004-01-01

259

Progress in plasma research at IPJ and IPPLM, Poland

No abstract prepared.

2004-07-01

260

Predicting results of mycobacterial culture on sputum smear reversion after anti-tuberculous treatment: a case control study.

... E. The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland)

2006-09-11

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

261

Policy implementation efforts in reducing nitrogen and phosphorus leaching from agriculture and forestry. A case study of the Laholm Bay

PMID:20205743

2010-03-06

262

Pilot Study of the Treatment of VEGF-Signaling Pathway Inhibitor-Induced Hypertension

Short communication

1994-11-01

263

Phytochemical study of Tynanthus fasciculatus (Bignoniaceae); Estudo fitoquimico de Tynanthus fasciculatus (Bignoniaceae)

Treatment Induced Hypertension

2011-01-19

264

Phase 3 Study of ThermoDox With Radiofrequency Ablation (RFA) in Treatment of Hepatocellular Carcinoma (HCC)

No abstract prepared.

2005-07-01

265

Parameter study for a dimple location in a space grid under the critical impact load

Hepatocellular Carcinoma

2011-06-07

266

On the Study of Intraseasonal and Interannual Oscillations Simulation by using Coupled Model

Full Text Available

2008-11-01

267

Neutron spectroscopy study of L- and DL-valine

Full Text Available

1999-12-01

268

Method of studying the SIALON wetting with oxides of silicon, aluminium, calcium and titanium

Short communication. 2 figs., 1 tab.

1994-01-01

269

Short communication.

1993-10-04

270

Magnetic forming studies

Korean Red Ginseng Powder in the Treatment of Melasma: An Uncontrolled Observational Study

Elastodynamic approach to measuring stress-strain relationship of uniaxially stressed wire, and

1967-01-01

271

Isopod Systematics and Evolution

Full Text Available

2011-06-01

272

Invisible scar endoscopic dorsal approach thyroidectomy: a clinical feasibility study: reply.

... inferences. Thatcher carries the banner for studies of isopod parasites of fishes of the Amazonian region. This fauna ... ...

273

In-vivo study on the harmful effect of the extremely low frequency unipolar pulsating magnetic field in mice.

PMID:21732206

2011-09-01

274

INTERRUPTED-GROWTH STUDIES OF THE SELF-ASSEMBLY OF INTRINSICALLY ACENTRIC SILOXANE-DERIVED MONOLAYERS

Full Text Available

1997-04-01

275

High-Resolution MRI Study on Mouse Brain Using Micro-Imaging

No abstract prepared.

2003-01-01

276

Full Text Available

2008-12-01

277

High energy physics

Group B Streptococcus (GBS) Polymerase Chain Reaction (PCR) Concordance Study

The research of the CELLO collaboration is reviewed. After a description of the CELLO detector tests of QCD and hadronic final states by determination of the strong coupling constant and studies of inclusive production of electrons and muons in multihadronic events in e"+e"- annihilation are described. Then studies of deep inelastic e#gamma# scattering with lepton pair production and the study of the structure function of the photon are briefly described. Finally studies on QED processes are described together with tau decays. (HSI).

1983-11-01

278

Groundwater flow analysis using different geothermal constraints: The case study of Acqui Terme area, northwestern Italy

Group B Streptococcus

2010-06-22

279

Fundamental study on Fuji Computed Radiography (FCR) image

Not Available

2011-01-01

280

Fuel characterization studies direct compound class quantitation of jet fuels by HPLC differential RI detection

Japanese (Mar 1986). Japan Tomiyoshi, Tsukasa Kakoi, Iwao Fukushima,

1986-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

281

Friction between Two Brownian Particles in a Lennard-Jones Solvent: A Molecular Dynamics Simulation Study

No Abstract Available

1983-01-01

282

Flue gas desulfurization pilot study. Phase I. Survey of major installations

Full Text Available

2010-08-01

283

Feasibility Study on the Application of 154kV HTS-FCL in Korean Power System

No abstract available.

1979-01-01

284

Extended molecular dynamics studies on {sup 40}Ca + {sup 40}Ca at 35A MeV

Full Text Available

2004-12-01

285

Experimental and Analytical Study of the Dynamic Behavior of a Polyurethane Spring Restoring Disk Bearing

No abstract prepared

1997-12-31

286

Experimental Study on the Similitude of Small-Scale Models in Cyclic Lateral Behaviors of RC Shear Wall Subassemblages

Full Text Available

2011-04-01

287

Experimental Study on Buckling Restrained Knee Bracing Systems Using Bolted Channel Sections

Full Text Available

2010-12-01

288

Experimental Study of Friction Pendulum System to Improve the Seismic Capacity of Transformer

Full Text Available

2009-04-01

289

Estimation of Surplus Solar Energy in Greenhouse (I) - Case Study Based on 1-2W Type -

Full Text Available

2008-04-01

290

Establishment of Short-Term Teratogenicity Study for Detecting Developmental Toxicity Induced by Gamma Radiation

Full Text Available

2009-09-01

291

Efficacy Study of a New Antimicrobial Wound Dressing to Treat Wounds Caused by Curettage and Electrodesiccation

Full Text Available

2004-06-01

292

Environmental Economics

Wastenet

environmental burden is studied by testing the Environmental Kuznets Curve hypothesis as well as application of statistical decomposition

293

Dynamics, Order And Fluctuations In Active Nematics : Numerical And Theoretical Studies

Acute Wounds

2011-03-04

294

Indian Institute of Science Theses & Dissertations (India)

Full Text Available

2008-10-01

295

Dynamic Study of Co-generator System Using EMTDC

Diquarks in gamma-p Collisions at LHeC

This paper deals with dynamic study of co-generator system with derived dynamic models of generator, excitation system, and turbine/governor from field tests. Mainly this study concentrates on frequency control by under-frequency relay. We simulates dynamic study of co-generator system using EMTDC. (author). 4 refs., 13 figs., 4 tabs.

2001-07-01

296

Decay studies of rare-earth isotopes produced in the proton-induced fission

This note studies the single production of scalar or vector diquarks at the LHeC collider.

2011-01-01

297

DNA adducts and cancer risk in prospective studies: a pooled analysis and a meta-analysis

No abstract prepared

1998-01-01

298

Convergence Study of the Multigrid Navier-Stokes Simulation : II. Implicit Preconditioners

Udgivelsesdato: 2008-May

2008-01-01

299

Comparison study of three fixed-bed digestors using different baked clay as biomass supports

Full Text Available

2004-08-01

300

Comparative study of PTFE-g-DMAA copolymer obtained from PTFE production in IPEN and commercial PTFE

Short communication.

1996-12-31

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

301

Comparative Study on Protein and Amino Acid Composition of Wild and Cultured Eel

Short communication.

1992-07-01

302

Cohort study of adherence to correct hand antisepsis before and after performance of clinical procedures

Full Text Available

1986-01-01

303

Charged nanoparticles as protein delivery systems: A feasibility study using lysozyme as model protein

Udgivelsesdato: 2009-Feb

2009-01-01

304

Characteristics study on fire-resistant paint used by TGA-IR

Udgivelsesdato: 2008/5

2008-01-01

305

Changes in BMI and blood pressure after a school based intervention: the CHILDREN study.

Full Text Available

2011-06-01

306

Cell culture systems to study glial transformation

PMID:19208697

2009-02-10

307

Breath Test for Chemicals (Volatile Organic Compounds)

The transformation of two different types of glial cells has been studied using an in vivo-/in vitro model and a complete in vitro model. The purpose of the study and to define in vitro model systems is to study the the neoplastic transformation of pure populations of glial cells. Data are presented to demonstrate that the transformed cells are glial and tumorigenic. (ACR)

1980-01-01

308

Biology of lichen communities in Antarctica.

Breath Tests; Human Volunteers; Pilot Study

2011-09-16

309

Behavior study of polyphenols from Maytenus aquifolium due to X and gamma radiations

-Ecophysiological and floristic study of the lichen communities in .... Plasticity of the Lichen Catillaria corymbosa in Different Microhabitats of the ...

310

BIOCHEMISTRY BRANCH ABSTRACTS

Short communication.

1995-09-03

311

BOOKMARKS:

Wastenet

Environmental Study/Action Team (NEST), UIPO Box 22025, Ibadan, Oyo-State, Nigeria ; tel/fax: +234 (

312

Antioxidant, antinociceptive activity and general toxicity study of Dendrophthoe falcata and isolation of quercitrin as the major component

... The anti-tumor drugs used for these studies were: busulfan, cyclophosphamide, metho- trexate, vinblastine and 6-mercaptopurine. ...

1968-01-01

313

An attempt to study ion outflow in the polar cusp with conjugated measurements from EISCAT and Cluster

Full Text Available

2006-12-01

314

Norwegian Open Research Archives (NORA)

Full Text Available

315

An analytical study of linear and non-linear double diffusive convection with Soret and Dufour effects in couple stress fluid

An RSA and DEXA Study on Migration of Proximal Interphalangeal (PIP) Joint Prostheses of the Hand

Not Available

2007-09-01

316

An Analytical Study on the Youngjeob Dogam Youn-hyangsek Euigwae of Choson Dynasty-(1609, 1634, 1643 year)-

Osteoarthritis

2010-10-12

317

AN AES/XPS STUDY OF THE CHEMISTRY OF PALLADIUM ...

Full Text Available

1992-03-01

318

A study on the bottom trawl gear by the trial of a stern trawler-I -On the Resistance of bottom trawl gear-

... AT THE INTERFACE, A THIN OXIDE LAYER IS OBSERVED ALONG WITH POSSIBLE PALLADIUM SILICIDES. PALLADIUM ...

1981-02-01

319

A study on improving the surface morphology of recycled wafer forsolar cells using micro_blaster

Full Text Available

2000-11-01

320

A study on determinants having influence on heating value of waste-derived solid fuels

Full Text Available

2010-07-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

321

A study of matrix metalloproteinase-9 inhibitor in Hovenia dulcis Thunberg

Full Text Available

2010-01-01

322

A prospective study on the incidence and predictive factors of relative adrenal insufficiency in Korean critically-ill patients.

Full Text Available

2011-04-01

323

A plantar flexion device exercise programme for patients with peripheral arterial disease: a randomised prospective feasibility study.

Full Text Available

2009-08-01

324

A new study of rf plasma nitriding

PMID:21820543

2010-10-23

325

A feasibility study of percutaneous radiofrequency ablation followed by radiotherapy in the management of painful osteolytic bone metastases.

Short communication. 12 refs., 1 fig.

1995-02-13

326

A Study on the Treatment of Parathion Pesticide Using Marsh and Pond Type Constructed Wetlands

PMID:21533865

2011-05-01

327

A Study on the Technique to Manufacture Recycled Cement from Cementitious Powders for Complete Recycling of Concrete Structures

Full Text Available

2004-09-01

328

A Study on the Robust Control of Horizontal-Shaft Magnetic Bearing System Considering Perturbation

Full Text Available

2004-09-01

329

A Study on the Resonant Transmission through a Ridge-Loaded Small Circular Aperture

Full Text Available

2010-01-01

330

A Study on the Relationship between the Eccentricity and the Level of Damage in the Seismic Response of Buildings with Plan Irregularities

Full Text Available

2011-06-01

331

A Study on the Quality Characteristics of Brand and Non-brand Korean beefs

Full Text Available

2010-06-01

332

A Study on the Mechanical Properties of Recycled Aggregate Concrete Mixed Steel Fiber

Full Text Available

2007-04-01

333

A Study on the Cooking and Processing Methods Presented in CHE MIN YO SUL -Palfaze-

Full Text Available

2009-08-01

334

A Study on the Cooking and Processing Methods Presented in CHE MIN YO SUL

Full Text Available

1991-06-01

335

A Study on the Application of the Mitigation System for Efficient Management of Coastal Wetlands in Korea -Enhancement of Legal Regime-

Full Text Available

1990-10-01

336

A Study on the Acid Degradation Properties of Cellulose Fabrics for Costume Heritage Restoration

Full Text Available

2003-12-01

337

A Study on Welding Residual Stress Measurement by Laser Inteferometry and Spot Heating Method

Full Text Available

2005-08-01

338

A Study on Stakeholders' Strategies toward IMO International Convention for Environmentally Sound Ship Recycling

Full Text Available

2008-03-01

339

A Study on Recycling Technology of EC for Semiconductor and LCD PR Stripping Process

Full Text Available

2009-06-01

340

A Study on International Trend and Korean Measures regarding Ship Recycling

Full Text Available

2009-10-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

341

A Study on Improving Graphic Rendering Engine for Visualization of Ship Handling Simulation

Full Text Available

2009-04-01

342

A Study on Flood Discharge Capacity and Hydraulic Characteristic of Labyrinth Weir as a Side-Channel Spillway

Full Text Available

2010-04-01

343

A Study on Fiber Formation and Physical Properties of Polyacrylonitrile Copolymer with Itaconic acid

Full Text Available

2008-01-01

344

A Study on Electrical Resistivity Behaviors of PAN-based Carbon Nanofiber Webs

Full Text Available

2002-04-01

345

A Study on Development of Electro Magnetic Wave Absorbers for Mobile Phones

Full Text Available

2007-03-01

346

A Study on Ca, P and Fe Excretions in Healthy adult Koreans on Their Usual Diet

Full Text Available

2006-05-01

347

A Study on Appropriate Device Authentication Scheme Based PKI for Exchangeable CAS (XCAS)

Full Text Available

1988-10-01

348

A Study of the Standard of Costume life in the Chosen Dynasty Period -Focus on Literature-

Full Text Available

2010-08-01

349

A Study of the Histological Effects of Garlic Extract in a Liver-damage Rat Model

Full Text Available

1985-08-01

350

A Study of the Characteristics of a Partial Discharge of SF6 Following a Fault

Full Text Available

2010-08-01

351

A Study of Wedding Feast Dishes in Gare Dogam Euigwae (1651, 1696)

Full Text Available

2007-11-01

352

A Study of Using FDM/ABS Parts as Wax-Pattern Substitutes in the Investment Casting Process

Full Text Available

1990-03-01

353

A Study of PRT-201 Administered Immediately After Arteriovenous Fistula Creation in Patients With Chronic Kidney Disease

Full Text Available

1999-10-01

354

A Study of Magnetic Properties for Recycling of Laser Printer Developer Roller

Chronic Kidney Disease

2011-07-19

355

A Study of Food Culture in South-Eastern Asia-about Dietetic Culture in Indonesia-

Full Text Available

2009-01-01

356

A STUDY TO DETERMINE THE DEFORMATION ...

Full Text Available

1992-03-01

357

A STUDY ON THE AIR SCREEN IN WATER 1. Experiments on the Air Screen Effects for Driving and Intercepting Fish School

... crystals and polycrystals. Nevertheless, explosive forming, magnetic forming, etc., are all high-strain-rate processes that ...

1963-04-01

358

A Numerical Study on a Circulation Control Foil using Coanda Effect

Full Text Available

1972-06-01

359

A Numerical Study on Slip Factor Variations in Centrifugal Compressor Impellers

Full Text Available

2000-05-01

360

A Comprehensive Computational Study on OCH+-Rg (Rg = He, Ne, Ar, Kr, Xe) Complexes.

Full Text Available

1999-09-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

361

Czech Academy of Sciences Repository

Full Text Available

2003-01-01

362

A Comparative Study on the Dietary Culture Consciousness and Their Consumption Attitude of Traditional Foods between Korean and Japanese Women

A Comparative Study About the Effect of Nonablative Laser and Thermal energy on Rabbit Knee Joint Capsular Properties

Full Text Available

2003-08-01

363

28 mm Ceramic-on-Ceramic Acetabular Cup Total Hip Replacement Study

Full Text Available

2001-06-01

364

Case studies and educational aids survey. A research report

Joint Diseases

2011-03-11

365

Medline Plus

... 2009) Arrhythmia Electrophysiological Study and Catheter Ablation with 3D Mapping (Mercy Hospital, Miami, FL, 11/15/2007) ...

366

Brookhaven National Laboratory Coastal Meteorology Program, 1972-1983

A survey was conducted to determine the sources of buildings energy conservation case studies and educational aids available in Canada. In total 785 consultants, educational institutions, building developers, manufacturers and government agencies were contacted. The results of this survey provide an indication of those agencies in Canada most actively involved with energy conservation in buildings, a listing of those agencies in Canada having case study information and/or educational aids materials available related to energy conservation in buildings, and a broad description of the subject area of the case studies and educational aids listed. The results of this study are intended to provide a source listing of energy conservation case studies and educational aids to the Buildings Energy Technology Transfer Program lead agencies and others conducting similar ...

1983-09-01

367

Guidelines for Reporting Reliability and Agreement Studies (GRRAS) were proposed

Research conducted at Brookhaven National Laboratory under the Coastal Meteorology and Diffusion Research Program from 1972 to 1983 is summarized by the following study areas: Diffusion Studies, Boundary Layer Studies, Coastal Meteorology Studies, Air-Sea Interaction Studies, Coastal Transport and Diffusion Climatology, Seabreeze Modeling and Instrument Development, all supported by the US Department of Energy. Studies supported by the Nuclear Regulatory Commission, the National Science Foundation and the American Petroleum Institute are also described. A summary of a Workshop on Coastal Atmospheric Transport Processes, an account of studies in progress, recommendations for future research and a description of facilities and instrumentation available are also included. A list of all publications and presentations prepared as part of the ...

1983-06-01

368

British Library Electronic Table of Contents (United Kingdom)

Objective: Results of reliability and agreement studies are intended to provide information about the amount of error inherent in any diagnosis, score, or measurement. The level of reliability and agreement among users of scales, instruments, or classifications is widely unknown. Therefore, there is a need for rigorously conducted interrater and intrarater reliability and agreement studies. Information about sample selection, study design, and statistical analysis is often incomplete. Because of inadequate reporting, interpretation and synthesis of study results are often difficult. Widely accepted criteria, standards, or guidelines for reporting reliability and agreement in the health care and medical field are lacking. The objective was to develop guidelines for reporting reliability and...

2011-01-01

369

Free radicals and their transformations in irradiated proteins

Terror management among Taiwanese: Worldview defence or resigning to fate?

Experimental investigation data are systematized of free radical states and processes in irradiated proteins. The investigation is performed by the radiospectral methods. Results are discussed in detail of the study of free radicals electronic structure of amino acids, peptides and proteins formed by the action of ionizing radiation. The specificity is stressed of the study of monocrystalls of these compounds by the method of electronic paramagnetic resonance. The nature is also studied of primary centres formed under the effect of radiation on biologically important compounds and their subsequent reactions in solid and liquid solutions. Ion-radical states of different functional groups of the protein molecule are studied. Prospects of the study and the role of anion-radicals in biological processes are discusses.

370

British Library Electronic Table of Contents (United Kingdom)

Terror management theory (TMT) proposes that people who are reminded of their mortality should be motivated to defend their cultural worldview. Studies 1 and 2 examined whether the TMT worldview defence-buffering effect found in Western cultures could be generalized to Asians in Taiwan. No such effect was found in the present studies. This non-significant result was robust when either a stronger distraction task was used (study 1) or when a subliminal manipulation of mortality salience was utilized (study 2). A meta-analysis, including 24 TMT experiments in East Asia, was also conducted (study 3). The average effect size (d = 0.11, r = 0.055) of worldview defence among these experiments was not significantly different from zero. Study 4 found that mortality salience manipulation also did n...

2010-01-01

371

Technical design aspects of Feasibility Study-II

Scientific report 1997; Rapport scientifique 1997

Feasibility Study-II examined a high-performance Neutrino Factory providing 1 x 10{sup 20} neutrinos per year aimed at a long-baseline detector. The Study was sponsored jointly by BNL and the Neutrino Factory and Muon Collider Collaboration ration (MC) and is based on a 1 MW proton driver operating at 24 GeV, i.e., an upgraded version of the AGS accelerator. Compared with the earlier FNAL-sponsored study (Feasibility Study-I), there is a sixfold improvement in performance. Here we describe details of the implementation of Study-II concepts and discuss their efficacy. Alternative approaches that will be pursued in follow-on R and D activities are also described briefly.

2001-08-15

372

Industrial hazardous wastes in Finland - trends related to the waste prevention goal

In this book are found technical and scientific papers on the main works of the Direction of the Fuel Cycle (DCC) in France. The study fields are: the up-side of the nuclear fuel cycle with theoretical studies (plasma simulation) and technological developments and instrumentation (lasers diodes, carbides plasma projection, carbon 13 enrichment); the down-side nuclear fuel cycle with theoretical studies (ion Eu{sup 3+} complexation simulation, decay simulation, uranium and plutonium diffusion study, electrolyser operating simulation), scenario studies ( recycling, wastes management), experimental studies; dismantling and cleaning (soils cleaning, surface-active agent for decontamination, fault tree analysis); analysis with expert systems and mass spectrometry. (A.L.B.)

1998-07-01

373

British Library Electronic Table of Contents (United Kingdom)

The objective of this study was to analyse one of the goals of the latest National Waste Plan of Finland: the relative reduction of hazardous waste (HW) generation by 15% over the period 1992 to 2005.Official statistics and a national database of the annual reports of HW generators were used as one basis for this study. A case study was focused on a selection of HW classes that were considered to be typical to the metal workshop industry. These HW classes were combined to form functional HW groups for the purpose of forming time series. Trends at the company level were studied by performing interviews and by studying the environmental permit documents of about 50 companies.The total amount of HW reported in Finland increased by 133% over the studied period. Meanwhile the GDP of Finland gre...

2008-01-01

374

Facial soft tissue response to anterior segmental osteotomies: A systematic review

British Library Electronic Table of Contents (United Kingdom)

Bimaxillary protrusion is prevalent among Asians and anterior segmental osteotomies are commonly used for its surgical correction. The objective of this study was to evaluate the soft tissue changes resulting from anterior segmental osteotomies. The electronic databases PubMed, Scopus and ISI Web of knowledge were searched for potentially eligible studies using a set of predetermined keywords. Full texts meeting the inclusion criteria were retrieved and their references were manually searched for additional relevant articles. The study details and outcome data of these reports were extracted using spreadsheets for comparison. The methodological quality of each study was assessed. Eleven studies met the inclusion criteria. Lateral cephalometry was used in all studies. A reduction of the lab...

2010-01-01

375

Economic study of a rural underground transmission system: A site-specific case study: Final report

Association and expression study of synapsin III and schizophrenia

This report presents the data and results of a site specific case study comparing costs of an overhead line with an underground circuit traversing the same route. The costs used for the overhead line are actual numbers for a line scheduled to be built by a utility. The underground circuit costs were developed using the same criteria of line rating, contingencies, and location. Often cost comparisons between overhead and underground lines are made using figures taken from studies with widely varying assumptions. This project attempts to provide a comparison by studying the costs of overhead and underground lines following the same route and using the same design assumptions. Caution must be used, however, in extending the results of this study beyond its original intent. It is site-specific and may be representative of only one area of the country. 9 refs., 23 figs., 18 tabs.

1987-10-01

376

British Library Electronic Table of Contents (United Kingdom)

The synapsin III gene, SYN3, which belongs to the family of synaptic vesicle-associated proteins, has been implicated in the modulation of neurotransmitter release and in synaptogenesis, suggesting a potential role in several neuropsychiatric diseases. The human SYN3 gene is located on chromosome 22q12-13, a candidate region implicated in previous linkage studies of schizophrenia. However, association studies of SYN3 and schizophrenia have produced inconsistent results. In this study, four SYN3 SNPs (rs133945 (-631 C>G), rs133946 (-196 G>A), rs9862 and rs1056484) were tested in three sets of totally 3759 samples that comprise 655 affected subjects and 626 controls in the Irish Case-Control Study of Schizophrenia (ICCSS), 1350 samples incorporating 273 pedigrees in the Irish Study of High D...

2009-01-01

377

beta- and gamma-decay studies of neutron-rich chromium, manganese, cobalt and nickel isotopes including the new isotopes $^{60}$Cr and $^{60g}$Mn

[NASA/DOD Aerospace Knowledge Diffusion Research Project. Report 3:] Technical communications in aeronautics: Results of an exploratory study. An analysis of profit managers' and nonprofit managers' responses

beta- and gamma-decay studies of neutron-rich chromium, manganese, cobalt and nickel isotopes including the new isotopes $^{60}$Cr and $^{60g}$Mn

1987-01-01

378

Utilization of Carbon Monoxide (CO) Of the Flue Gas of a Hot Air Cupola Furnace Used for Melting.

Data collected from an exploratory study concerned with the technical communications practices of

1989-01-01

379

Tyrosine-derived polycarbonate membrane in treating mandibular bone defects. An experimental study

In this study the technical and economical possibilities of burning carbon monoxide (CO) of the flue gas and utilizing of the released heat in hot air cupola furnace used for melting have been studied. As basis for examining was burning of cleaned furnace...

1986-01-01

380

Twenty Years of Public Health Research: Inclusion of Lesbian, Gay, Bisexual, and Transgender Populations

This study was designed to evaluate the suitability of a novel bioabsorbable material in treating bone defects. A poly(desaminotyrosyl-tyrosine-ethyl ester carbonate) (PDTE carbonate) membrane (thickness...Full Text Available

2006-10-22

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

381

Trial of early nifedipine in acute myocardial infarction: the Trent study.

Objectives. This study determined to what extent lesbian, gay, bisexual, and transgender (LGBT) populations have been studied over the past 20 years of public health research.Methods....Full Text Available

2002-07-01

382

Transforaminal endoscopic surgery for symptomatic lumbar disc herniations: a systematic review of the literature

Over 30 months 9292 consecutive patients admitted to nine coronary care units with suspected myocardial infarction were considered for admission to a randomised double blind study comparing the effect...Full Text Available

1986-11-08

383

Transcriptional profile of isoproterenol-induced cardiomyopathy and comparison to exercise-induced cardiac hypertrophy and human cardiac failure

The study design includes a systematic literature review. The objective of the study was to evaluate the effectiveness of transforaminal endoscopic surgery and to compare this with open microdiscectomy...Full Text Available

2010-02-01

384

Tissue Effect on Genetic Control of Transcript Isoform Variation

BackgroundIsoproterenol-induced cardiac hypertrophy in mice has been used in a number of studies to model human cardiac disease. In this study, we compared the transcriptional response...Full Text Available

385

The prevalence and correlates of self-reported hearing impairment in the Ibadan Study of Ageing

Current genome-wide association studies (GWAS) are moving towards the use of large cohorts of primary cell lines to study a disease of interest and to assign biological relevance to the genetic signals...Full Text Available

2009-08-01

386

The neurobiology of social attachment: A comparative approach to behavioral, neuroanatomical, and neurochemical studies*

AbstractThis cohort study of 1302 persons aged ≥65 years, conducted in the Yoruba-speaking regions of Nigeria, determines the prevalence and correlates of hearing impairment (HI)...Full Text Available

2010-08-01

387

The management of children with chronic fatigue syndrome-like illness in primary care: a cross-sectional study

The formation and maintenance of social bonds in adulthood is an essential component of human health. However studies investigating the underlying neurobiology of such behaviors have been scarce....Full Text Available

2008-11-01

388

The influence of histological diagnosis on the postoperative complication rate following trans-urethral resection of prostate (TURP).

BackgroundMost studies on children with chronic fatigue syndrome (CFS)/myalgic encephalomyelitis (ME) have been undertaken in tertiary care and little is known about their management...Full Text Available

2006-01-01

389

The impact of water intake on energy intake and weight status: a systematic review

BACKGROUND: A number of studies have shown that the early mortality following TURP is higher for patients with prostate cancer than those with benign disease. This study examines the effect of the histological...Full Text Available

2002-11-01

390

The effect of physician practice organization on efficient utilization of hospital resources.

The effects of consuming water with meals rather than drinking no beverage or various other beverages remains under-studied. This systematic review of English language studies compared the effects...Full Text Available

2010-09-01

391

The associations between serum sex hormones, erectile function, and sex drive

OBJECTIVE. This study examines variations in the efficient use of hospital resources across individual physicians. DATA SOURCES AND SETTING. The study is conducted over a two-year period (1989-1990)...Full Text Available

1994-12-01

392

The Significance of Bladder Trabeculation in the Female Lower Urinary System: An Objective Evaluation by Urodynamic Studies

Few studies have examined the association between sex hormone serum levels, erectile function, and sex drive. Using data from the Olmsted County Study of Urinary Symptoms and Health Status among...Full Text Available

2008-09-01

393

The Relationship between Intimate Partner Violence, Rape and HIV amongst South African Men: A Cross-Sectional Study

This study aimed to investigate the relationship between bladder trabeculation, urinary function, and the stage of pelvic organ prolapse (POP). The medical records of 104 patients with POP who underwent...Full Text Available

2005-10-31

394

The Non-linear Relationship between Gait Speed and Falls: The MOBILIZE Boston Study

ObjectiveTo investigate the associations between intimate partner violence, rape and HIV among South African men.DesignCross-sectional study involving...Full Text Available

395

OBJECTIVESAlthough several studies suggest that slow gait speed is a predictor of falls, it may also be a protective mechanism to prevent falls. Further, fast walking...Full Text Available

2011-06-01

396

Taking social relationships seriously: Lessons learned from the informed consent practices of a vaccine trial on the Kenyan Coast

ObjectivesThe objective of this paper is to describe the complex mixed-methods design of a study conducted to assess health-related quality of life (HRQOL) outcomes...Full Text Available

2008-07-01

397

TJ-41 Induces Apoptosis and Potentiates the Apoptotic Effects of 5-FU in Breast Cancer Cell Lines

AbstractIndividual informed consent is a key ethical obligation for clinical studies, but empirical studies show that key requirements are often not met. Common recommendations to strengthen...Full Text Available

2008-09-01

398

Synergism between Prior Anisakis simplex Infections and Intake of NSAIDs, on the Risk of Upper Digestive Bleeding: A Case-Control Study

Recent studies suggest that TJ-41, a herbal drug, possesses chemotherapeutic effects. Accordingly, this study was undertaken to investigate the anticarcinogenic effects of TJ-41 on human breast cancer...Full Text Available

2009-01-01

399

Study of wood plastic composite in the presence of nitrogen containing additives

BackgroundThe aim of this study was to investigate the relationship between prior Anisakis infections and upper gastrointestinal bleeding (UGIB), and its interaction...Full Text Available

400

Study of wood plastic composite in the presence of nitrogen containing additives

Effect of nitrogen-containing additives in the study of wood plastic composites of MMA with simul and mango wood of Bangladesh has been investigated. Nine different additives were used and the additives containing carboamide group induce the highest tensile strength to the composite. (author).

1994-10-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

401

Study of wood plastic composite in the presence of nitrogen containing additives

Effect of nitrogen-containing additives in the study of wood plastic composites of MMA with simul and mango wood of Bangladesh has been investigated. Nine different additives were used and the additives containing carboamide group induce the highest tensile strength to the composite. (author).

1994-01-01

402

Study of particles trapped by a magnetic field

Effect of nitrogen-containing additives in the study of wood plastic composites of MMA with simul and mango wood of Bangladesh has been investigated. Nine different additives were used and the additives containing carboamide group induce the highest tensile strength to the composite.

1994-10-01

403

Studies on the mechanism of 1,3-butadiene-induced leukemogenesis: the potential role of endogenous murine leukemia virus.

A new type of radiation which occurs when particles are accelerated in the field of a longitudinal wave and in a transverse magnetic field is studied. The characteristics of such spontaneous radiation are obtained, and the influence of collective effects on the radiation is analyzed. The application of the findings to the theory of free electron lasers is discussed. 8 references.

1986-01-01

404

Studies on micellar fatty acid uptake by rat intestine in vitro with reference to the role of bile

Previous studies have revealed marked differences in the incidence of leukemia between rats and mice exposed to 1,3-butadiene that do not appear to be readily explained on the basis of pharmacokinetics...Full Text Available

1990-06-01

405

Studies on Poly(propylene fumarate-co-caprolactone diol) Thermoset Composites towards the Development of Biodegradable Bone Fixation Devices

1. The uptake and esterification to trigylceride of oleic acid in micellar form was studied in rat intestine in vitro. Sacs of the upper half of the everted intestine taken from bile...Full Text Available

1973-03-01

406

Studies on Inhibition of Intestinal Absorption of Radioactive Strontium

The effect of reinforcement in the cross-linked poly(propylene fumarate-co-caprolactone diol) thermoset composites based on Kevlar fibres and hydroxyapatite was studied. Cross-linked poly(propylene...Full Text Available

2009-01-01

407

Strategies for the production of genetically identical monkeys by embryo splitting

A method is reported which permits selective suppression of absorption of radioactive strontium from ingested food material, permitting the calcium to be available to the body. Studies were carried...Full Text Available

1964-08-08

408

Spectroscopic studies of the type 2 and type 3 copper centres in the mercury derivative of laccase.

Genetically identical rhesus monkeys would have tremendous utility as models for the study of human disease and would be particularly valuable for vaccine trials and tissue transplantation studies where...Full Text Available

409

Solid state and materials research: metal-semiconductor interactions

U.v.-visible-absorption and e.p.r. spectroscopy were used to study the type 2 and type 3 copper centres in the mercury derivative of laccase. After treatment with peroxide the mercury derivative of...Full Text Available

1989-10-15

410

Roles of curli, cellulose and BapA in Salmonella biofilm morphology studied by atomic force microscopy

This section of the report is concerned with the study of the metallisation, oxidation and doping of materials which are of importance to the micro-electronics industry. The Van de Graaff accelerator and radioactive tracers are used for studying surface and sub-surface behaviour of these materials.

411

Risks of consumption of contaminated seafood: the Quincy Bay case study.

BackgroundCurli, cellulose and the cell surface protein BapA are matrix components in Salmonella biofilms. In this study we have investigated the roles of these...Full Text Available

412

Risk of hematological malignancies associated with magnetic fields exposure from power lines: a case-control study in two municipalities of northern Italy

A recent EPA-sponsored study of sediment and seafood contamination in Quincy Bay revealed elevated levels of several complex organic pollutants frequently of concern in human health assessments. A seafood...Full Text Available

1991-01-01

413

Risk management in design engineering bids

BackgroundSome epidemiologic studies have suggested an association between electromagnetic field exposure induced by high voltage power lines and childhood leukemia, but null results...Full Text Available

414

Risk factors associated with mental illness in Oyo State, Nigeria: A Community based study

Accurate engineering cost estimates are critical in developing bids for new work, and for effective resource allocation and project control. This study reports on design estimating methods found in the literature, and on the results of two empirical studies of how estimating techniques are used in professional practice and their accuracy. The study found great reliance on a classic {open_quotes}activity analysis{close_quotes} approach to estimating design resources, and significant hazards in commonly used parametric techniques. The study found that project managers expect their estimates to be accurate (with 80% confidence interval) of between -10% to +25%. The study also found that actual bids between engineering firms had a much greater range (-40% to +45%) than can be explained by accuracy. Perhaps most importantly the study found that none of the sampled ...

1995-06-01

415

Revisional Percutaneous Full Endoscopic Disc Surgery for Recurrent Herniation of Previous Open Lumbar Discectomy

BackgroundThe main objective of this study was to determine the prevalence and factors associated with mental illness in Oyo State at community level using the general health questionnaire...Full Text Available

416

Reverse Engineering of Gene Regulatory Networks: A Comparative Study

Study DesignA retrospective study.PurposeTo determine the feasibility and effectiveness of revisional percutaneous full endoscopic discectomy for...Full Text Available

2011-03-01

417

Retrospective identification and characterization of mild cognitive impairment from a prospective population cohort

Reverse engineering of gene regulatory networks has been an intensively studied topic in bioinformatics since it constitutes an intermediate step from explorative to causative gene expression...Full Text Available

2009-01-01

418

Religion as a Natural Phenomenon

ObjectivesMild Cognitive Impairment (MCI) case-finding criteria have low specificity in general population studies. The present study retrospectively identifies cases...Full Text Available

2010-08-01

419

ScienceCinema

...same sort of handle ? religious that we have on global warming or energy policy or ...other words my claim is that we need to study religion the way we study global warming and all the other really serious phenomena on this planet ...

420

Radiographic monitoring of incidental abdominal aortic aneurysms: a retrospective population-based cohort study

Psychopathological features of irritable bowel syndrome patients with and without functional dyspepsia: a cross sectional study

BackgroundAn abdominal aortic aneurysm (AAA) that is identified when the abdomen is imaged for some other reason is known as an incidental AAA. No population-based studies have...Full Text Available

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

421

Psychometric evaluation of a radio electric auricular treatment for stress related disorders: a double-blinded, placebo-controlled controlled pilot study

BackgroundIrritable bowel syndrome (IBS) and functional dyspepsia (FD) show considerable overlap and are both associated with psychiatric comorbidity. The present study aimed to...Full Text Available

422

Properties of cellulose solutions in methylmorpholine N-oxide containing montmorillonite nanoparticles and of composite films thereof

BackgroundThe aim of this double-blind randomized study is to test the efficacy of a radio electric stimulator device using an auricular reflex therapy protocol for stress-related...Full Text Available

423

British Library Electronic Table of Contents (United Kingdom)

Rheological properties of moderately concentrated solutions of cellulose in methylmorpholine N-oxide-dimethylformamide mixtures containing hydrophilic montmorillonite nanoparticles were studied. Film composite materials were prepared, and their physicomechanical properties and structural organization were studied.

2011-01-01

424

Pregnant women's working conditions and their changes during pregnancy: a national study in France.

Post traumatic stress symptoms and heart rate variability in Bihar flood survivors following yoga: a randomized controlled study

In a study of 2387 employed women who had worked for more than three months of their pregnancy the data were extracted from a survey carried out on a national sample of births in France in 1981. Manual,...Full Text Available

1987-04-01

425

Position-sensitive proportional counter for space-based X-ray imaging studies

BackgroundAn earlier study showed that a week of yoga practice was useful in stress management after a natural calamity. Due to heavy rain and a rift on the banks of the Kosi river,...Full Text Available

426

Plasminogen-¹²⁵I responses in dogs to a single injection of urokinase and typhoid vaccine and to vascular injury

ASTROSAT, India's first dedicated astronomy satellite is slated for launch in 2007. The primary science objective of ASTROSAT is to explore the Universe using broad-band instruments covering optical, UV, soft X-ray and hard X-ray studies

2005-03-01

427

Photochemical injury to the foveomacula of the monkey eye following argon blue-green panretinal photocoagulation.

In vivo plasminogen responses to various stimuli were studied. Plasminogen-¹²⁵I was prepared and used first for metabolic studies of plasminogen in control dogs. The average results were:...Full Text Available

1972-06-01

428

Perceived Entitlement to Pain-Related Support and Pain Catastrophizing: Associations with Perceived and Observed Support

PURPOSE: Visual loss following panretinal photocoagulation was found in the Diabetic Retinopathy and the Early Treatment Diabetic Retinopathy Studies. This study was designed to test the hypothesis...Full Text Available

2000-01-01

429

Pain and pain-related interference in adults with lower-limb amputation: Comparison of knee-disarticulation, transtibial, and transfemoral surgical sites

Studies on the determinants of pain-related support are needed to enhance couples-based treatments for pain. The purpose of this study was to determine the extent to which pain catastrophizing...Full Text Available

2009-12-15

430

Ocular motility in alternating squints: an electro-oculographic study.

Pain and pain-related interference with physical function have not been thoroughly studied in individuals who have undergone knee-disarticulation amputations. The principal aim of this study...Full Text Available

2009-01-01

431

Non-agonistic familiarity decreases aggression in male Turkish hamsters, Mesocricetus brandti

Ocular movements were studied electro-oculographically in 10 normal subjects and 10 patients with alternating strabismus. Fixation and pursuit movements and to a less extent the saccadic movements were...Full Text Available

1982-04-01

432

Myofibrillogenesis in the developing zebrafish heart: A functional study of tnnt2

In laboratory studies, hamsters (Mesocricetus spp.) exhibit intense male-male aggression, thus making them an excellent model system for studies of the functional and mechanistic...Full Text Available

2009-02-01

433

Mutagenicity studies in a tyre plant: in vitro activity of workers' urinary concentrates and raw materials.

Various hypotheses have been proposed to explain the molecule processes of sarcomere assembly, partially due to the lack of systematic genetic studies of sarcomeric genes in an in vivo...Full Text Available

2009-07-15

434

Modulation of leg muscle function in response to altered demand for body support and forward propulsion during walking

The possible contribution to urinary mutagenicity of occupational exposures in the rubber industry was studied by assaying the urine concentrates of 72 workmen (44 smokers) employed in a tyre plant....Full Text Available

1985-07-01

435

Model Study of Instant Vehicular Camouflage.

A number of studies have examined the functional roles of individual muscles during normal walking, but few studies have examined which are the primary muscles that respond to changes in external...Full Text Available

2009-05-11

436

Metal atom diffusion in amorphous silica and at the silica surface. Progress report, December 1, 1982-December 1, 1983

A feasibility study to determine what materials and geometric systems would be required for fabrication of a camouflage system that would instantaneously cover a military vehicle in order to disrupt its characteristic shape or outline. The program involve...

1973-01-01

437

Magnetic excitations studied with time-of-flight spectroscopy

Objective is to study the effects of local structure, interatomic forces, and atom size on the mobility of metal atoms in amorphous silica and at the silica surface. EXAFS studies of Zn and Pt in silica are reported. (DLC)

1983-01-01

438

Lin28a transgenic mice manifest size and puberty phenotypes identified in human genetic association studies

An introduction to time-of-flight neutron spectroscopy is presented in the context of the study of magnetic materials. Examples are taken from the class of rare earth and actinide magnetic materials known as `strongly correlated electron` systems. (author) 11 figs., 24 refs.

1996-11-01

439

Investigating the spatial variability in incidence of coronary heart disease in the Gazel cohort: the impact of area socioeconomic position and mediating role of risk factors

Recently, genome-wide association studies (GWAS) have linked the human LIN28B locus to height and timing of menarche [1-Full Text Available

2010-07-01

440

Innovation and survival: a case study in planning medical library services.

Study objectiveThe study aim was to improve our understanding of the relationships between contextual socioeconomic characteristics and coronary heart disease (CHD)...Full Text Available

2011-02-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

441

Inferring Past Pesticide Exposures: A Matrix of Individual Active Ingredients in Home and Garden Pesticides Used in Past Decades

In the information age, information utilities like libraries are as sensitive to the stresses of change as any other organization. This article is a case study of a small, specialized medical library...Full Text Available

1998-10-01

442

Infant stepping: a method to study the sensory control of human walking

BackgroundIn retrospective studies of the health effects of home and garden pesticides, self-reported information typically forms the basis for exposure assessment. Study participants...Full Text Available

2007-02-01

443

In vivo study of chloroplast volume regulation.

Stepping responses were studied in infants between the ages of 10 days and 10 months while they were supported to step on a slowly moving treadmill belt. Surface...Full Text Available

1998-03-15

444

Immunoglobulins in myasthenia gravis. Kinetic properties of the acetylcholine-receptor antibody studied during lymph drainage.

This paper describes a new technique that can be used to study chloroplast volume regulation in vivo. Nuclear magnetic resonance spectroscopy was used to measure relative amounts of chloroplast water...Full Text Available

1992-05-01

445

Immortalizing the Complexity of Cancer Metastasis Genetic Features of Lethal Metastatic Pancreatic Cancer Obtained from Rapid Autopsy

A specific immunoglobulin, the receptor antibody, can be found in most patients with myasthenia gravis. In order to study the kinetic properties of this antibody, serial determinations of receptor antibody,...Full Text Available

1978-10-01

446

Identifying barriers to Papanicolaou smear screening in Korean women: Korean National Health and Nutrition Examination Survey 2005

The virtual lack of well-characterized metastatic pancreatic cancer tissues for study has limited systematic studies of the metastatic process of this deadly disease. To address this important...Full Text Available

2005-05-01

447

How Missing Information in Diagnosis Can Lead to Disparities in the Clinical Encounter

ObjectiveThis study was conducted to provide a nationwide analysis on barriers to cervical cancer screening in Korea.MethodsData used for this study...Full Text Available

2010-06-01

448

Health and function of participants in the Long Life Family Study: A comparison with other cohorts

Previous studies have documented diagnostic bias and noted that its reduction could eliminate misdiagnosis and improve mental health service delivery. Few studies have investigated clinicians'...Full Text Available

2008-11-01

449

Genetic association between the COMT genotype and urinary levels of tea polyphenols and their metabolites among daily green tea drinkers

Individuals from families recruited for the Long Life Family Study (LLFS) (n= 4559) were examined and compared to individuals from other cohorts to determine whether the recruitment targeting longevity...Full Text Available

450

Five year prospective study of plasma renin activity and blood pressure in patients with longstanding reflux nephropathy.

Available in vitro and animal studies have shown cancer protective effects of tea polyphenols. Recent study suggests a greater protective effect of green tea intake on breast cancer...Full Text Available

451

Fast Flux Test Facility Reactor Vessel Removal Study

Eight of 100 normotensive children who had pyelonephritic scarring secondary to urinary infection and vesicoureteric reflux were found in an earlier study to have increased plasma renin activity (PRA)....Full Text Available

1987-07-01

452

Factors influencing the in vitro interaction between immunoglobulins and isolated C1: a critical study

This study assesses the feasibility of removing the FFTF reactor vessel from its current location in the reactor cavity inside the Containment vessel to a transporter for relocation to a burial pit in the 200 Area.

2002-10-23

453

Experimental study of axial and crossflow velocity in a 7-pin wire wrapped bundle

The C1 fixation test is widely used for the study of the interaction between immunoglobulins, their fragments and the complement system. Some factors influencing the apparent extent of the C1 fixation...Full Text Available

1978-05-01

454

Evaluation of Oral Administration of Adenine to Dogs and Primates.

The results of an experimental study of axial and crossflow velocity in a 7-pin wire wrapped bundle similar for FFTF fuel bundles are reported. The results are compared with the forced crossflow model of the COBRA-III C computer program. (JWR)

1974-02-01

455

Estimating the incidence of coeliac disease with capture-recapture methods within four geographic areas in Italy.

Little change was observed in primates fed 75 mg/kg adenine over the four-week period. Minimal tissue pathology was encountered upon completion of the study. In contrast to earlier studies in which oral feeding of adenine to dogs caused severe symptoms, a...

1974-01-01

456

Estimating Missing Heritability for Disease from Genome-wide Association Studies

STUDY OBJECTIVE: To estimate the incidence rate of newly diagnosed cases of coeliac disease in Italy. DESIGN: This was a descriptive study of coeliac disease incidence in the period 1990-91. SETTING:...Full Text Available

1996-06-01

457

Epidermal keratinocytes do not activate peripheral T-cells: interleukin-10 as a possible regulator

Genome-wide association studies are designed to discover SNPs that are associated with a complex trait. Employing strict significance thresholds when testing individual SNPs avoids false positives at...Full Text Available

2011-03-11

458

Electron Spin Resonance Studies of Ionic Permeability Properties of Thylakoid Membranes of Beta vulgaris and Avicennia germinans1

The immunogenicity of allogeneic cultured human epidermal keratinocytes (cHEKs) has been studied in several models with contradictory results. We studied human T-cell activation in an in vitro...Full Text Available

2008-11-01

459

Effects of bovine leukemia virus infection on production and reproduction in dairy cattle.

Measurement of intrathylakoid aqueous volumes by electron spin resonance spectroscopy was used to study ionic permeability properties of thylakoid membranes isolated from Beta vulgaris...Full Text Available

1985-05-01

460

Effect of misonidazole pretreatment on nitrogen mustard-induced DNA cross-linking in mouse tissues in vivo.

The purpose of this study was to determine the effects of bovine leukemia virus (BLV) infection on production, reproduction and longevity in dairy cattle. The study population was a commercial Holstein...Full Text Available

1992-10-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

461

Effect of Peroxisome Proliferator-Activated Receptor Gamma Agonist (Pioglitazone) and Methotrexate on Disease Activity in Rheumatoid Arthritis (Experimental and Clinical Study)

In the present study we have used the alkaline elution technique to study the effect of misonidazole (MISO) on the initial amount of DNA cross-linking in various normal and neoplastic tissues of C3H...Full Text Available

1984-12-01

462

ESR studies of spin-labeled membranes aligned by isopotential spin-dry ultracentrifugation: lipid-protein interactions.

Objective:To investigate the combined effect of both pioglitazone and methotrexate on disease activity of rheumatoid arthritis in a biphasic study; experimental and clinical.Methods:Experimentally:...Full Text Available

463

Dual Beneficial Effects of (-)-Epigallocatechin-3-Gallate on Levodopa Methylation and Hippocampal Neurodegeneration: In Vitro and In Vivo Studies

Electron spin resonance (ESR) studies have been performed on spin-labeled model membranes aligned using the isopotential spin-dry ultracentrifugation (ISDU) method of Clark and Rothschild. This method...Full Text Available

1994-12-01

464

Does the socioeconomic context explain both mortality and income inequality? Prospective register-based study of Norwegian regions

BackgroundA combination of levodopa (L-DOPA) and carbidopa is the most commonly-used treatment for symptom management in Parkinson's disease. Studies have shown that concomitant...Full Text Available

465

Divorce, divorce rates, and professional care seeking for mental health problems in Europe: a cross-sectional population-based study

BackgroundStudies from various countries have observed worse population health in geographical areas with more income inequality. The psychosocial interpretation of this association...Full Text Available

466

Diesel engine exhaust and lung cancer: an unproven association.

BackgroundLittle is known about differences in professional care seeking based on marital status. The few existing studies show more professional care seeking among the divorced...Full Text Available

467

Developing IT Infrastructure for Rural Hospitals: A Case Study of Benefits and Challenges of Hospital-to-Hospital Partnerships

The risk of lung cancer associated with diesel exhaust has been calculated from 14 case-control or cohort studies. We evaluated the findings from these studies to determine whether there is sufficient...Full Text Available

1995-09-01

468

DOD (Department of Defense) Acquisition: Case Study of the MILSTAR (Military Strategic and Tactical Relay) Satellite Communications System.

This article presents a study identifying benefits and challenges of a novel hospital-to-hospital information technology (IT) outsourcing partnership (HHP). The partnership is an innovative response...Full Text Available

2008-07-01

469

Critical review of studies on atmospheric dispersion in coastal regions

The study of the Military Strategic and Tactical Relay (MILSTAR) program focuses on the role of the program manager and contracting officer in developing the acquisition strategy.

1986-01-01

470

Common genetic variation and susceptibility to partial epilepsies: a genome-wide association study

This study effort was required as a preliminary step prior to initiation of field measurements of atmospheric dispersion in coastal regions. The Nuclear Regulatory Commission (NRC) is in the process of planning an extensive field measurement program to generate data which will serve as improved data bases for licensing decisions, confirmation of regulations, standards, and guides, and for site characterizations. The study being reported here is an effort directed to obtaining as much information as is possible from existing studies that is relevant toward NRC's objectives. For this study, reports covering research and meteorological measurements conducted for industrial purposes, utility needs, military objectives, and academic studies were obtained and critically reviewed in light of NRC's current data needs. This report provides an interpretation of the extent of ...

1982-09-01

471

Cobalt-57-bleomycin scanning of hila and mediastinum in patients with bronchial carcinoma: a prospective study.

Partial epilepsies have a substantial heritability. However, the actual genetic causes are largely unknown. In contrast to many other common diseases for which genetic association-studies have successfully...Full Text Available

2010-07-01

472

Clinical and laboratory studies in patients with leprosy and enthesitis.

Because the results with cobalt-57-bleomycin (57Co-bleo) as a tumour-seeking agent in patients with pulmonary tumours were promising, a prospective study was carried out to test the sensitivity and...Full Text Available

1976-12-01

473

Chronic lymphatic leukaemia and engine exhausts, fresh wood, and DDT: a case-referent study.

In a combined clinical, radiological, and laboratory study of 77 patients throughout the leprosy spectrum, 10 patients had an enthesitis which has not been described previously as far as is known and...Full Text Available

1990-09-01

474

Childhood cancer and overhead powerlines: a case-control study.

The effect of potential risk factors for chronic lymphatic leukaemia was evaluated in a case-referent study encompassing 111 cases and 431 randomised referents, all alive. Information on exposure was...Full Text Available

1988-01-01

475

Case-control study of hydrocarbon exposures in patients with renal cell carcinoma.

A case-control study has been carried out to examine the occurrence of childhood cancer in relation to the proximity of overhead power lines to a child's home address at birth and to the calculated...Full Text Available

1990-12-01

476

Case series of maxillary sinus augmentation with biphasic calcium phosphate: a clinical and radiographic study

A retrospective case-control study tested the hypothesis that exposure to hydrocarbon combustion products is associated with the development of renal cell carcinoma. One control per case, matched for...Full Text Available

1989-06-01

477

Carboxymethylation of peat in 2-propanol

PurposeThe aim of this study was to evaluate 3.5 years-cumulative survival rate of implants placed on augmented sinus using Osteon, a bone graft material, and to assess the height...Full Text Available

2011-04-01

478

British Library Electronic Table of Contents (United Kingdom)

The effects of the time and temperature of alkaline pretreatment and the time and temperature of the carboxymethylation of peat in 2-propanol on the concentration of carboxymethyl groups and the solubility of the resulting products in water and an aqueous alkali solution were studied. The viscosity characteristics of the aqueous and aqueous alkaline solutions of peat carboxymethylation products were studied.

2011-01-01

479

Candidate salivary biomarkers associated with alveolar bone loss: cross-sectional and in vitro studies

Bacterial indicators of risk of diarrhoeal disease from drinking-water in the Philippines.

This cross-sectional study evaluated the association between radiographic evidence of alveolar bone loss and the concentration of host-derived bone resorptive factors (interleukin-1 beta, tumor...Full Text Available

2007-03-01

480

Association between skin diseases and severe bacterial infections in children: case-control study

Inadequate measures of water quality have been used in many studies of the health effects associated with water supplies in developing countries. The present 1-year epidemiological-microbiological study...Full Text Available

1991-01-01

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481

Association between length of storage of red blood cell units and outcome of critically ill children: a prospective observational study

BackgroundSepsis or bacteraemia, however rare, is a significant cause of high mortality and serious complications in children. In previous studies skin disease or skin infections...Full Text Available

482

Association Study of Serine Racemase Gene with Methamphetamine Psychosis

IntroductionTransfusion is a common treatment in pediatric intensive care units (PICUs). Studies in adults suggest that prolonged storage of red blood cell units is associated with...Full Text Available

2010-01-01

483

Assessment of a bone biopsy technique for measuring tiludronate in horses: A preliminary study

Experimental studies have demonstrated that not only dopaminergic signaling but also glutamatergic/NMDA receptor signaling play indispensable roles in the development of methamphetamine psychosis. Our...Full Text Available

2011-03-01

484

Asking the right questions: Scoping studies in the commissioning of research on the organisation and delivery of health services

This study assessed the feasibility of measuring tiludronate in horses using a minimally invasive bone biopsy technique. Eight horses were treated with intravenous (IV) tiludronate [1 mg/kg bodyweight...Full Text Available

2011-04-01

485

Army Corps as a Joint Task Force Headquarters.

Scoping studies have been used across a range of disciplines for a wide variety of purposes. However, their value is increasingly limited by a lack of definition and clarity of purpose. The UK's Service...Full Text Available

486

Application of tumor, bacterial and parasite susceptibility assays to study immune alterations induced by environmental chemicals

This study investigates the doctrinal guidance available to a corps headquarters if required to serve as ajoint task force headquarters and simultaneously be required to warfight the corps. The study contends that a corps being required to simultaneously ...

1997-01-01

487

Antibody protects against lethal infection with the neurally spreading reovirus type 3 (Dearing).

Model systems to study the effects of chemicals of environmental concern on bacterial and parasitic diseases as well as the immunosurveillance and destruction of transplantable tumor cells were described...Full Text Available

1982-02-01

488

An Evaluation of the Value of Choice with Preschool Children

The mammalian reoviruses have provided a valuable model for studying the pathogenesis of viral infections of the central nervous system (CNS). We have used this model to study the effect of antibody...Full Text Available

1988-12-01

489

Amorphous to crystalline phase transformation in Metglas reg-sign studied by Moessbauer spectroscopy

The current study examined the reinforcing effects of choosing among alternatives in a four-part evaluation. In the first study, initial-link responses in a concurrent-chains arrangement resulted in...Full Text Available

2006-01-01

490

Ak-Chin Indian Community Biomass Feasiiblity Study

The authors present differential scanning calorimetry (DSC) and in situ Moessbauer spectroscopy results for Metglas ribbons, to which different heat treatments were made. The Curie temperature of the amorphous phase is determined and the evolution of the magnetic field of this phase is studied as a function of temperature

1997-12-01

491

Addressing the Question of the Effect of RBC Storage on Clinical Outcomes: The Red Cell Storage Duration Study (RECESS) (Section 7)

Study of the conversion of chicken litter to biogas for the production of energy. There was an additional requirement that after extracting the energy from the chicken litter the nutrient value of the raw chicken litter had to be returned to the Ak-Chin Farms for use as fertilizer in a form and delivery method acceptable to the Farm.

2005-12-31

492

A prospective randomised study on the long-term effect of lumbar fusion on adjacent disc degeneration

The question of whether storage of red blood cells (RBCs) alters their capacity to deliver oxygen and affects patient outcomes remains in a state of clinical equipoise. Studies of the changes...Full Text Available

2010-08-01

493

A nested case-control study of maternal-neonatal transmission of hepatitis B virus in a Chinese population

The existence and importance of an accelerated adjacent segment disc degeneration (ASD) after lumbar fusion have previously not been demonstrated by RCTs. The objectives of this study were, to determine...Full Text Available

2009-08-01

494

A chemical-modification approach to the olfactory code. Studies with a thiol-specific reagent

AIM: To examine the determinants of maternal-neonatal transmission of hepatitis B virus (HBV).METHODS: A nested case-control study was conducted in Changsha, Hunan, People’s Republic...Full Text Available

2011-08-21

495

A case cohort study of suicide in relation to exposure to electric and magnetic fields among electrical utility workers.

The effects of thiol-specific reagents on the amplitude of the electro-olfactogram (E.O.G.) responses elicited from frog olfactory mucosa by pulses of odorant vapours was studied. The impermeant thiol-specific...Full Text Available

1978-12-15

496

A Meta-Analysis of Animal Studies on Disruption of Spatial Navigation by Prenatal Cocaine Exposure

OBJECTIVES--This case cohort study examines whether there is an association between exposure to electric and magnetic fields and suicide in a population of 21,744 male electrical utility workers from...Full Text Available

1996-01-01

497

A Longitudinal Study of Incarceration and HIV Risk Among Methadone Maintained Men and Their Primary Female Partners

Water-maze testing has been used to assess prenatal cocaine (PCOC)- induced deficits in behavioral studies of spatial navigation and memory abilities. Effects of PCOC in acquisition or in probe...Full Text Available

2007-01-01

498

A Controlled Challenge Study on Di(2-ethylhexyl) Phthalate (DEHP) in House Dust and the Immune Response in Human Nasal Mucosa of Allergic Subjects

This study examines the longitudinal relationship between personal and sexual partner incarceration and subsequent HIV risk behaviors among drug-involved men and their primary female sexual...Full Text Available

2011-02-01

499

A Comparative Study of 25 (OH) Vitamin D Serum Levels in Patients with Multiple Sclerosis and Control Group in Isfahan, Iran

BackgroundFew studies have yet addressed the effects of di(2-ethylhexyl) phthalate (DEHP) in house dust on human nasal mucosa.ObjectivesWe investigated...Full Text Available

2008-11-01

500