scholarly journals Characterization of artificially shocked forsterites: (3) Profile analysis of Raman spectra.

2000 ◽  
Vol 22 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Isamu SHINNO ◽  
Yoshihiro NAKAMUTA ◽  
Tomoki NAKAMURA ◽  
Toshimori SEKINE
Keyword(s):  
Raman Spectra ◽  
Profile Analysis

Applications of SIMS to electronic materials and devices

1992 ◽  
Vol 50 (2) ◽  
pp. 1682-1683
Author(s):  
S.F. Corcoran
Keyword(s):  
Depth Distribution ◽  
Secondary Ion Mass Spectrometry ◽  
Semiconductor Device ◽  
Electronic Materials ◽  
Profile Analysis ◽  
Semiconductor Industry ◽  
Small Diameter ◽  
Depth Resolution ◽  
Detection Sensitivity

Over the past decade secondary ion mass spectrometry (SIMS) has played an increasingly important role in the characterization of electronic materials and devices. The ability of SIMS to provide part per million detection sensitivity for most elements while maintaining excellent depth resolution has made this technique indispensable in the semiconductor industry. Today SIMS is used extensively in the characterization of dopant profiles, thin film analysis, and trace analysis in bulk materials. The SIMS technique also lends itself to 2-D and 3-D imaging via either the use of stigmatic ion optics or small diameter primary beams.By far the most common application of SIMS is the determination of the depth distribution of dopants (B, As, P) intentionally introduced into semiconductor materials via ion implantation or epitaxial growth. Such measurements are critical since the dopant concentration and depth distribution can seriously affect the performance of a semiconductor device. In a typical depth profile analysis, keV ion sputtering is used to remove successive layers the sample.

Synthesis and Characterization of Tris(trimethyltin) Thiophosphate (Me3Sn)3PO3S

1993 ◽  
Vol 48 (12) ◽  
pp. 1781-1783 ◽  
Author(s):  
Abdel-Fattah Shihada
Keyword(s):  
Aqueous Medium ◽  
Raman Spectra ◽  
Mass Spectra ◽  
Ir And Raman Spectra ◽  
Synthesis And Characterization ◽  
Polymeric Structure ◽  
Ir And Raman

(Me3Sn)3PO3S has been prepared from the reaction of Me3SnCl with Na3PO3S • 12 H2O under cooling in aqueous medium. Its IR and Raman spectra are found to be consistent with a polymeric structure with tetra- and penta-coordinated tin atoms. The 31P NMR and mass spectra of (Me3Sn)3PO3S are reported and discussed.

Microstructure Characterization of Metal Mixed Oxides

MRS Advances ◽  
2017 ◽  
Vol 2 (64) ◽  
pp. 4025-4030 ◽  
Author(s):  
T. Kryshtab ◽  
H. A. Calderon ◽  
A. Kryvko
Keyword(s):  
Mixed Oxides ◽  
Profile Analysis ◽  
Atomic Resolution ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Reconstruction Procedure ◽  
Transmission Electron ◽  
Xrd Patterns ◽  
Co Precipitation

ABSTRACTThe microstructure of Ni-Mg-Al mixed oxides obtained by thermal decomposition of hydrotalcite-like compounds synthesized by a co-precipitation method has been studied by using X-ray diffraction (XRD) and atomic resolution transmission electron microscopy (TEM). XRD patterns revealed the formation of NixMg1-xO (x=0÷1), α-Al2O3 and traces of MgAl2O4 and NiAl2O4 phases. The peaks profile analysis indicated a small grain size, microdeformations and partial overlapping of peaks due to phases with different, but similar interplanar spacings. The microdeformations point out the presence of dislocations and the peaks shift associated with the presence of excess vacancies. The use of atomic resolution TEM made it possible to identify the phases, directly observe dislocations and demonstrate the vacancies excess. Atomic resolution TEM is achieved by applying an Exit Wave Reconstruction procedure with 40 low dose images taken at different defocus. The current results suggest that vacancies of metals are predominant in MgO (NiO) crystals and that vacancies of Oxygen are predominant in Al2O3 crystals.

scholarly journals The Transcriptional Regulator Hap1p (Cyp1p) Is Essential for Anaerobic or Heme-Deficient Growth of Saccharomyces cerevisiae: Genetic and Molecular Characterization of an Extragenic Suppressor that Encodes a WD Repeat Protein

Genetics ◽  
1998 ◽  
Vol 148 (2) ◽  
pp. 559-569 ◽  
Author(s):  
Yann Chantrel ◽  
Mauricette Gaisne ◽  
Claire Lions ◽  
Jacqueline Verdière
Keyword(s):  
Profile Analysis ◽  
Signal Transduction Pathway ◽  
Cysteine Residue ◽  
Sequence Comparisons ◽  
Dependent Signal ◽  
Polysome Profile ◽  
Essential Function ◽  
Wd Repeat ◽  
Extragenic Suppressors

Abstract We report here that Hap1p (originally named Cyp1p) has an essential function in anaerobic or heme-deficient growth. Analysis of intragenic revertants shows that this function depends on the amino acid preceding the first cysteine residue of the DNA-binding domain of Hap1p. Selection of recessive extragenic suppressors of a hap1−hem1− strain allowed the identification, cloning, and molecular analysis of ASC1 (Cyp1 Absence of growth Supressor). The sequence of ASC1 reveals that its ORF is interrupted by an intron that shelters the U24 snoRNA. Deletion of the intron, inactivation of the ORF, and molecular localization of the mutations show unambiguously that it is the protein and not the snoRNA that is involved in the suppressor phenotype. ASC1, which is constitutively transcribed, encodes an abundant, cytoplasmically localized 35-kD protein that belongs to the WD repeat family, which is found in a large variety of eucaryotic organisms. Polysome profile analysis supports the involvement of this protein in translation. We propose that the absence of functional Asc1p allows the growth of hap1−hem1− cells by reducing the efficiency of translation. Based on sequence comparisons, we discuss the possibility that the protein intervenes in a kinase-dependent signal transduction pathway involved in this last function.

Classification and characterization of US consumers based on their perceptions of risk of tablet use in international hotels

2019 ◽  
Vol 10 (3) ◽  
pp. 233-254 ◽  
Author(s):  
Cristian Morosan ◽  
Agnes DeFranco
Keyword(s):  
Cyber Security ◽  
Risk Perceptions ◽  
Latent Profile Analysis ◽  
Profile Analysis ◽  
Cyber Attacks ◽  
Security Risk ◽  
Content Type ◽  
Perceptions Of Risk ◽  
Using Data

Purpose Cyber-attacks on hotel information systems could threaten the privacy of consumers and the integrity of the data they exchange upon connecting their mobile devices to hotel networks. As the perceived cyber-security risk may be reflected heterogeneously within the US consumer population traveling internationally, the purpose of this study is to examine such heterogeneity to uncover classes of US consumers based on their perceptions of risk of using tablets for various tasks when staying in hotels abroad. Design/methodology/approach Using data collected from 1,016 US consumers who stayed in hotels abroad, this study used latent profile analysis (LPA) to classify the consumers based on their perceptions of risk associated with several tablet use behaviors in hotels. Findings The analysis uncovered four latent classes and produced a characterization of these classes according to several common behavioral (frequency of travel, the continent of the destination, duration of stay and purpose of travel) and demographic (gender, age, income and education) consumer characteristics. Originality/value Being the first study that classifies consumers based on the risk of using tablets in hotels while traveling internationally, this study brings the following contributions: offers a methodology of classifying (segmenting) consumer markets based on their cyber-security risk perceptions, uses LPA, which provides opportunities for an accurate and generalizable characterization of multivariate data that comprehensively illustrate consumer behavior and broadens the perspective offered by the current literature by focusing on consumers who travel from their US residence location to international destinations.

Characterization of Excitonic Nature in Raman Spectra Using Circularly Polarized Light

ACS Nano ◽  
2020 ◽  
Vol 14 (8) ◽  
pp. 10527-10535
Author(s):  
Yan Zhao ◽  
Shishu Zhang ◽  
Yuping Shi ◽  
Yanfeng Zhang ◽  
Riichiro Saito ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized

scholarly journals Green Synthesis and Characterization of Gallium(III) Sulphide (α-Ga2S3) Nanoparicles at Room Temperature

Nano Hybrids ◽  
2014 ◽  
Vol 6 ◽  
pp. 37-46 ◽  
Author(s):  
Tansir Ahamad ◽  
Saad M. Alshehri
Keyword(s):  
Green Synthesis ◽  
Band Gap ◽  
Raman Spectra ◽  
Room Temperature ◽  
Optical Band Gap ◽  
Blue Shift ◽  
Synthesis And Characterization ◽  
Spectroscopic Techniques ◽  
Sodium Thiosulphate

Two different batches of Gallium (III) sulphide nanocrystals, (α-Ga2S3)1 and (α-Ga2S3)2 were synthesized at room temperature by the reaction of Gallium (III) chloride with sodium thiosulphate in water for 10 and 20 min respectively. The resultant nanoparticles were characterized by different spectroscopic techniques. TEM micrographs showed well-defined, close to hexagonal particles, and the lattice fringes in the HRTEM images confirmed their nanocrystalline nature. The sizes of (α-Ga2S3)1 and (α-Ga2S3)2 were 12 and 35 nm respectively with similar morphologies. Optical band gap energies (3.43 eV/3.41 eV) and photoluminescence peaks 635/641 nm (red shift) and 414/420 nm (blue shift) of the synthesized α-Ga2S3 nanocrystals suggest that they may be promising photocatalysts. Raman spectra for the α-Ga2S3, shows very sharp bands at 119, 135 and 148 cm-1 due to Ga-S2 scissoring.

The Hydrothermal Formation of Hydronium Alunite from Aqueous Al2(SO4)3 Solution and the Characterization of the Solid

2002 ◽  
Vol 216 (9) ◽  
Author(s):  
W.W. Rudolph ◽  
R. Mason
Keyword(s):  
Raman Spectra

Raman spectra have been measured for aqueous AlA white precipitate in equilibrium with the solution at 184 °C could be characterized as (H

Solids Formation from Synthetic Fuel Reprocessing Solutions: Characterization of Zirconium Molybdate by ICP, XRF, and Raman Microprobe Spectroscopy

1986 ◽  
Vol 40 (3) ◽  
pp. 330-336 ◽  
Author(s):  
B. S. M. Rao ◽  
E. Gantner ◽  
H. G. Müller ◽  
J. Reinhardt ◽  
D. Steinert ◽  
...  
Keyword(s):  
Raman Spectra ◽  
X Ray Diffraction ◽  
Synthetic Fuel ◽  
Precipitation Decrease ◽  
Zirconium Molybdate ◽  
Raman Microprobe ◽  
Hydrated Zirconium ◽  
Diffraction Patterns ◽  
Almost All

Raman microprobe, ICP, and XRF techniques have been applied to characterize the solids precipitated from HNO3 solutions containing Zr and Mo under different solution conditions. The saturation yields of precipitation decrease linearly—in almost all cases—with increasing acid strength, and nearly complete precipitation of Mo occurs in 3-M HNO3 solutions; ionic strength does not seem to affect the yields. Raman spectra of the microparticles indicate that hydrated zirconium molybdate is the main product, except in solutions with large excess of Mo relative to Zr. Identification of the species formed in these solutions is made by comparison of the Raman spectra with the spectra of known compounds. X-ray diffraction patterns of hydrated and thermally treated zirconium molybdate are in accord with the reported crystallographic data.

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