Combustion Synthesis and Infrared Characterization of TiB2

2014 ◽  
Vol 602-603 ◽  
pp. 142-145
Author(s):  
Su Li ◽  
Jun Shou Li ◽  
Fang Zhao ◽  
Ming Yuan Wang ◽  
Xiao Juan Wu
Keyword(s):  
Hydrochloric Acid ◽  
Wave Band ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
High Temperature Synthesis ◽  
Hexagonal Shape ◽  
Before And After ◽  
Infrared Spectral ◽  
Middle Infrared

On the basis of magnesiothermy, with Mg powder, TiO2 powder and B2O3 powder as mixed reactants, relatively pure TiB2 powder was prepared by self-propagating high temperature synthesis (SHS) after leached in diluted hydrochloric acid with the suitable concentration. The product after leached was examined by XRD for qualitative and quantitative analysis, SEM for morphology analysis and infrared spectroscopy for transmittance analysis. It was found that diluted hydrochloric acid could decrease most of the impurities, and the proportion of TiB2 phase in the product is more than 99%, which was hexagonal shape crystal with the grain size of 200-300 nm. Compare with the infrared spectrogram of the middle infrared spectral region of the product of before and after acid pickling, it was found that the transmittance of TiB2 is extremely low in the range of 2000-4000 cm-1, which can be excellent infrared absorption material in the corresponding wave band.

Description of 3D Microstructure of the Composites with Polypropylene (PP) Matrix and Tuf Particles Fillers

2013 ◽  
Vol 197 ◽  
pp. 186-191 ◽  
Author(s):  
Aneta Gądek-Moszczak ◽  
Sabina Żmudka
Keyword(s):  
Mechanical Properties ◽  
Volcanic Ash ◽  
Morphological Characterization ◽  
Qualitative And Quantitative Analysis ◽  
3D Images ◽  
Polypropylene Composites ◽  
Qualitative And Quantitative ◽  
The Matrix ◽  
Working Out

The main goal of the study was working out the method of qualitative and quantitative analysis of the microstructure on 3D images of the polypropylene composites with Tuf (type of rock consisting volcanic ash) particles. Three types of composite were analyzed: with 10, 15 and 25% of Tuf. The standard morphological parameters were indicated that describes size, shape, and distribution of Tuf particles in the matrix. The morphological characterization of examined microstructure was compared with mechanical properties. The optimal from the point of mechanical properties composition of this composite were proposed.

X-ray photoelectron spectroscopy characterization of aerosol particles in Antarctica

2015 ◽  
Vol 27 (5) ◽  
pp. 493-499 ◽  
Author(s):  
Simona Rella ◽  
Cosimino Malitesta
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Chemical Elements ◽  
Aerosol Particles ◽  
Qualitative And Quantitative Analysis ◽  
Surface Enrichment ◽  
X Ray ◽  
Qualitative And Quantitative

AbstractQualitative and quantitative analysis of surface species on size-segregated atmospheric particulate collected in Antarctica during the 2010–11 summer was performed by X-ray photoelectron spectroscopy (XPS). This represents the first example of surface characterization of Antarctic aerosols. The size class with particle cut-off diameter of 3 μm was richest in terms of chemical elements. Peculiar findings of the application included detection of Ca (possibly surface-segregated) and surface enrichment of Mg. The determination of nitrate, ammonium and sulphate species on collection filters provides evidence for a possible advantage of XPS over more laborious techniques (e.g. ion chromatography). The presence of these species is in reasonable agreement with other recent reports from Antarctica.

Effect of Morphology on Spectral Radiative Properties of Three-Dimensionally Ordered Macroporous Ceria Packed Bed

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
Krithiga Ganesan ◽  
Jaona Randrianalisoa ◽  
Wojciech Lipiński
Keyword(s):  
Spectral Range ◽  
Near Infrared ◽  
Packed Bed ◽  
Radiative Properties ◽  
Before And After ◽  
Infrared Spectral ◽  
Thermochemical Processes ◽  
Path Lengths ◽  
Ordered Macroporous

In this paper, radiative characterization of a packed bed of novel three-dimensionally ordered macroporous (3DOM) ceria particles is performed in the spectral range relevant to solar thermochemical processes, 0.35–2.2 μm. Normal–hemispherical transmittance and reflectance of three samples of various thicknesses are measured. Monte Carlo ray-tracing (MCRT) and discrete ordinate methods are employed to identify transport scattering albedo and transport extinction coefficient in the spectral range corresponding to weak absorption in the semi-transparency band of ceria. 3DOM ceria particles are characterized by weaker scattering in comparison to sintered ceria ceramics, and increased transparency in the near-infrared spectral range 0.7–2 μm. The ordered pore-morphology of the 3DOM ceria after thermochemical redox cycling between temperatures 1373 K and 1073 K is altered due to sintering of walls of the 3DOM structure. The absorption coefficient of the packed bed is found to be practically independent of morphology. Radiative characterization of 3DOM ceria ceramics before and after thermochemical cycling suggests that preserving the 3DOM structure can lead to scattering characteristics that permit longer attenuation path lengths of incident concentrated solar radiation in the material, as well as be favorable for confinement of the near-infrared radiation during thermochemical cycling leading to favorable thermochemical conditions for fuel production.

scholarly journals Shaping Public Opinion for Confrontation: Catalan Independence Claims as Represented in Spanish, Catalan, Valencian, and Basque Editorials

2017 ◽  
Vol 61 (9) ◽  
pp. 1040-1055 ◽  
Author(s):  
Enric Xicoy ◽  
Cristina Perales-García ◽  
Rafael Xambó
Keyword(s):  
Turning Point ◽  
Basque Country ◽  
September 11 ◽  
Constitutional Court ◽  
Qualitative And Quantitative Analysis ◽  
Political Actors ◽  
Qualitative And Quantitative ◽  
Independence Movement ◽  
Before And After ◽  
The Relationship

Editorials represent a newspaper’s principal means of ideological positioning and serve to identify the attitude of each newspaper and its readership to some of the main actors in any given conflict, especially those that are political in nature. Catalonia’s independence movement has experienced a surge in recent years. The turning point came in July 2010, after Spain’s constitutional court ruled against some aspects of Catalonia’s Statute of Autonomy (the legislation regulating the relationship between the Catalan autonomous community and the Spanish state). The ruling annulled some of the articles of the statute. The demonstration in support of Catalan independence that took place on September 11, 2012, was considered the most important among several mass rallies held for this purpose over successive years on Catalonia’s National Day. This article presents the results of a qualitative and quantitative analysis of editorial articles published around these two key dates, with the goal of studying each newspaper’s treatment of political actors and their degree of identification with these actors. Their use of arguments aimed at persuading readers and legitimizing a given position during the specified time periods in 2010 and 2012 will also be studied. The study focuses on the editorial articles published by several newspapers in four distinct regional contexts: Catalonia, Valencia, the Basque Country, as well as the whole of Spain. The analyzed articles were published a few days before and after July 10, 2010, and September 11, 2012.

The Influence of High Velocity Thermal Spraying Methods on Top Surface Topography of WC-Co Coatings

2015 ◽  
Vol 226 ◽  
pp. 149-154
Author(s):  
Hanna Myalska ◽  
Jakub Wieczorek ◽  
Krzysztof Szymański ◽  
Grzegorz Moskal
Keyword(s):  
High Velocity ◽  
Surface Condition ◽  
Thermal Spraying ◽  
Case Analysis ◽  
Deposition Process ◽  
Qualitative And Quantitative Analysis ◽  
Feedstock Powder ◽  
Qualitative And Quantitative ◽  
Laser Profilometry

Characterization of top surfaces of WC-Co coatings obtained during deposition process of high velocity thermal spraying type was showed in this article. The feedstock powder was so called “superfine” powder of WC-17Co types produced by Inframat. In first part of article short characterization of powder was presented, especially characterization of it morphology including shape, internal microstructure and grain size description. The second part of article is dedicated to characterization of microstructure and topography of top surface of coatings deposited by two different methods of high velocity thermal spraying. In this case analysis of top-surface condition by scanning microscopy with chemical analysis in microareas was used and as well as a qualitative and quantitative analysis of topography of carbides surface by traditional non-contact and laser profilometry.

scholarly journals An integrated strategy reveals complex glycosylation of erythropoietin using top-down and bottom-up mass spectrometry

2021 ◽  
Author(s):  
Yudong Guan ◽  
Min Zhang ◽  
Manasi Gaikwad ◽  
Hannah Voss ◽  
Ramin Fazel ◽  
...  
Keyword(s):  
First Generation ◽  
Mass Spectrometric ◽  
Protein Glycosylation ◽  
Qualitative And Quantitative Analysis ◽  
Top Down ◽  
Bottom Up ◽  
Qualitative And Quantitative ◽  
Integrated Strategy ◽  
Mass Shifts

ABSTRACTThe characterization of glycoproteins, like erythropoietin, is challenging due to the structural micro- and macro-heterogeneity of the protein glycosylation. This study presents an in-depth strategy for glycosylation analysis of a first-generation erythropoietin (epoetin beta), including a developed top-down mass spectrometric workflow for N-glycan analysis, bottom-up mass spectrometric methods for site-specific N-glycosylation and a LC-MS approach for O-glycan identification. Permethylated N-glycans, peptides and enriched glycopeptides of erythropoietin were analyzed by nanoLC-MS/MS and de-N-glycosylated erythropoietin was measured by LC-MS, enabling the qualitative and quantitative analysis of glycosylation and different glycan modifications (e.g., phosphorylation and O-acetylation). Extending the coverage of our newly developed Python script to phosphorylated N-glycans enabled the identification of 140 N-glycan compositions (237 N-glycan structures) from erythropoietin. The site-specificity of N-glycans was revealed at glycopeptide level by pGlyco software using different proteases. In total, 215 N-glycan compositions were identified from N-glycan and glycopeptide analysis. Moreover, LC-MS analysis of de-N-glycosylated erythropoietin species identified two different O-glycan compositions, based on the mass shifts between non-O-glycosylated and O-glycosylated species. This integrated strategy allows the in-depth glycosylation analysis of a therapeutic glycoprotein to understand its pharmacological properties and improving the manufacturing processes.

Effect of Morphology on Spectral Radiative Properties of Three-Dimensionally Ordered Macroporous Ceria Packed Bed

2013 ◽  
Author(s):  
Krithiga Ganesan ◽  
Jaona Randrianalisoa ◽  
Wojciech Lipiński
Keyword(s):  
Spectral Range ◽  
Near Infrared ◽  
Packed Bed ◽  
Radiative Properties ◽  
Before And After ◽  
Infrared Spectral ◽  
Thermochemical Processes ◽  
Path Lengths ◽  
Ordered Macroporous

In this paper, radiative characterization of a packed bed of novel three-dimensionally ordered macroporous (3DOM) ceria particles is performed in the spectral range relevant to solar thermochemical processes, 0.35–2.2μm. Normal–hemispherical transmittance and reflectance of three samples of various thicknesses are measured. Monte Carlo ray-tracing and discrete ordinate methods are employed to identify transport scattering albedo and transport extinction coefficient in the spectral range corresponding to weak absorption in the semi-transparency band of ceria. 3DOM ceria particles are characterized by weaker scattering in comparison to sintered ceria ceramics, and increased transparency in the near-infrared spectral range 0.7–2 μm. The ordered pore-morphology of the 3DOM ceria after thermochemical redox cycling between temperatures 1373 K and 1073 K is altered due to sintering of walls of the 3DOM structure. The absorption coefficient of the packed bed is found to be practically independent of morphology. Radiative characterization of 3DOM ceria ceramics before and after thermochemical cycling suggests that preserving the 3DOM structure can lead to scattering characteristics that permit longer attenuation path lengths of incident concentrated solar radiation in the material, as well as be favorable for confinement of the near-infrared radiation during thermochemical cycling leading to favorable thermochemical conditions for fuel production.

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