scholarly journals FEATURES OF STRUCTURE FORMATION IN THE JOINING ZONE OF COPPER-STEEL COMPOSITE COPPER M3 + STEEL 30CRMNSIA AFTER EXPLOSION WELDING AND THERMAL IMPROVEMENT

2021 ◽  
pp. 11-17
Author(s):  
V. N. Arisova ◽  
A. F. Trudov ◽  
L. M. Gurevich ◽  
V. O. Kharlamov ◽  
V. Yu. Nazarova
Keyword(s):  
Structure Formation ◽  
Cross Section ◽  
Chemical Elements ◽  
Explosion Welding ◽  
Energy Dispersive Analysis ◽  
Electron Microscopic ◽  
High Tempering ◽  
Thermal Improvement ◽  
Steel Composite ◽  
Subsequent Quenching

The results of optical and electron microscopic metallographic studies and energy-dispersive analysis of the structure and composition in the zone of connection of copper M3 with steel 30 CrMnSiA after explosion welding, subsequent quenching from a temperature of 880 ° C and high tempering at a temperature of 520 ° C are presented. The change in the distribution of hardness and chemical elements over the cross section of the bimetal, the formation of martensite in melts after quenching and its decomposition during high tempering are shown.

scholarly journals STRUCTURE TRANSFORMATION IN THE ZONE OF BIMETAL COPPER + STEEL 30CRMNSIA AFTER EXPLOSION WELDING AND FOLLOWING ANNEALING

2021 ◽  
pp. 13-18
Author(s):  
V. N. Arisova ◽  
A. F. Trudov ◽  
L. M. Gurevich ◽  
V. O. Kharlamov ◽  
V. Yu. Nazarova
Keyword(s):  
Cross Section ◽  
Chemical Elements ◽  
Explosion Welding ◽  
Holding Time ◽  
Subsequent Annealing ◽  
Structure Transformation ◽  
Joint Zone ◽  
The Cross

The results of studies of the structure in the joint zone of 30CrMnSiA steel with copper М3 after explosion welding and subsequent annealing at a temperature of 880 ° C and a holding time of 1 hour are presented. The formation of alloys of various configurations is shown, the distribution of chemical elements and the distribution of hardness over the cross-section of the bimetal are studied.

Structure Formation in the Zones of Joints Obtained by Explosion Welding with Subsequent Rolling of a Five-Layer Titanium-Steel Composite

Metallurgist ◽  
2019 ◽  
Vol 63 (1-2) ◽  
pp. 96-104 ◽  
Author(s):  
V. N. Arisova ◽  
L. M. Gurevich ◽  
A. F. Trudov ◽  
A. G. Serov ◽  
V. G. Kharlamov
Keyword(s):  
Structure Formation ◽  
Explosion Welding ◽  
Steel Composite

scholarly journals Correction to: Structure Formation in the Zones of Joints Obtained by Explosion Welding with Subsequent Rolling of a Five-Layer Titanium-Steel Composite

Metallurgist ◽  
2019 ◽  
Vol 63 (3-4) ◽  
pp. 429-429
Author(s):  
V. N. Arisova ◽  
L. M. Gurevich ◽  
A. F. Trudov ◽  
A. G. Serov ◽  
V. O. Kharlamov
Keyword(s):  
Structure Formation ◽  
Explosion Welding ◽  
Steel Composite

scholarly journals Determination of chemical elements and cross-section hardness of sclerotic darkened human dentin

2017 ◽  
Vol 20 (3) ◽  
Author(s):  
Mauricio Yugo Souza ◽  
Laura Celia Fernandes Meirelles ◽  
Isabela Roberta Vieira Duque ◽  
Mariane Cintra Mailart ◽  
Taciana Marco Ferraz Caneppele ◽  
...  
Keyword(s):  
Cross Section ◽  
Chemical Elements ◽  
Human Teeth ◽  
Significance Level ◽  
X Ray ◽  
Tooth Remineralization ◽  
Human Dentin ◽  
Knoop Microhardness ◽  
Mg Content

<p><strong>Objective</strong>: The aim of this study was to assess the amount of chemical elements (Ca, O, C, P, Fe, and Mg) and the cross-section hardness of sclerotic darkened dentin in human teeth. <strong>Material</strong> <strong>and</strong> <strong>Methods</strong>: The study was approved by the local IRB and ten extracted teeth (five sound and five presenting sclerotic darkened dentin) were used. Tooth was sectioned mesiodistally and each half was used for each test. Amount of chemical elements (%w) was determined by energy dispersive X-ray spectroscopy (EDS) in three different dentin areas (shallow, medium, or deep sound or sclerotic dentin). Knoop microhardness was determined at the same EDS areas. Data were analyzed by two-way ANOVA and multiple comparison tests, with significance level at 5%. <strong>Results</strong>: No difference on microhardness was detected between sound and sclerotic dentin (p = 0.743) and also among dentin depths (p = 0.837). Lower Ca (p = 0.024) and higher C (p = 0.015) amounts were found at superficial sclerotic dentin. Increased Mg content (p &lt; 0.001) was detected in sound dentin. <strong>Conclusion</strong>: It was concluded darkened sclerotic dentin presents similar cross-section microhardness to sound dentin. The assessed chemical elements were similarly present in sound or sclerotic dentin, except for Mg, which was present higher concentration in sound dentin. Ca and P were lower in superficial sclerotic dentin.</p><p> </p><p><strong>Keywords: </strong>Dentin; Hardness; Minerals; Tooth Remineralization.</p>

Features of the architectonics of the microstructure of the primary remex of Owls (Strigiformes) due to the specifics of the flight

2021 ◽  
Vol 66 (2) ◽  
pp. 232-246
Author(s):  
E. O. Fadeeva
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cross Section ◽  
Dorsal Surface ◽  
Structural Features ◽  
Electron Microscopic Investigation ◽  
Original Research ◽  
Electron Microscopic ◽  
Microstructural Characteristics ◽  
Scanning Electron

Conducted electron microscopic investigation of the primary remex fine structure of thirteen species of Owls (Strigiformes), using a scanning electron microscope (SEM). It is shown that Owls (Strigiformes) have a number of specific primary remex microstructural characteristics. First of all, these are the features of the structure of the pennaceous barb: a cross section configuration, a pith architectonics on the cross section and longitudinal sections, a cuticular structur of the barb. A number of the unique features in the microstructure of the vanules of the pennaceous barb have been found for the first time (at the scanning electron microscope level, at a large SEM magnification). First of all, these are the structural features of the distal barbules and the structure of the apical portion of the barb with the elongated proximal barbules and the distal barbules tightly contiguous to the ramus and closed with each other. Mentioned characteristics make for the thick velvet-like dorsal surface of the vane and the presence of a complex of peculiar “bunches” (fringes) forming the cleft edge (a fringed edge) of the inner vane – exceptionally specific adaptive characteristics in Strigiformes. Рresentenced original research results suggest that Owls (Strigiformes) have a number specific microstructural characteristics of the primary remex and also a number of the unique features in the microstructure of the primary remex which reflecting the ecological and morphological adaptations conditioned by the flight specificity.

SYNTHESIS AND CHARACTERIZATON OF HIGH-QUALITY GaN NANORODS WITH TRIANGULAR CROSS SECTION

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2859-2864 ◽  
Author(s):  
X. X. WU ◽  
J. J. FU ◽  
Y. YANG ◽  
Q. WU ◽  
Z. HU ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Section ◽  
Optoelectronic Devices ◽  
Hexagonal Structure ◽  
Electron Microscopic ◽  
High Quality ◽  
Triangular Cross Section ◽  
Transmission Electron ◽  
Transmission Electron Microscopic ◽  
Potential Applications

High-quality GaN nanorods with triangular cross section were synthesized via a simple chloride-assisted vapor phase epitaxy method. High-resolution transmission electron microscopic observations show that the synthesized GaN nanorods are single crystal with wurtzite hexagonal structure. Raman and photoluminescence measurements were also carried out to study the optical properties of the as-prepared GaN nanorods, which suggests the potential applications in optoelectronic devices.

Physico-Mechanical and Chemical Characteristics of Amber

2018 ◽  
Vol 277 ◽  
pp. 80-89 ◽  
Author(s):  
Zynovii Malanchuk ◽  
Viktor Moshynskyi ◽  
Yevhenii Malanchuk ◽  
Valerii Korniienko
Keyword(s):  
Chemical Composition ◽  
Cross Section ◽  
Sandy Soil ◽  
Chemical Elements ◽  
Chemical Characteristics ◽  
Geological Cross Section ◽  
Sandy Shale ◽  
The Cost ◽  
Physical And Chemical

Amber of amber-bearing deposits in Rivne-Volyn region of Ukraine has been analyzed. Relying upon instrumental techniques, physical and chemical as well as spectral analyses, and geological prospecting of the deposits, chemical composition and ultimate composition of amber occurring at the territory of Klesiv deposit (Ukraine, Rivne Region, Sarny District) have been identified. Klesiv amber contains the greatest part of inclusions; it contains 18 chemical elements. Basing upon the performed geological cross-section it has been determined that the amber occur in sandy soil and sandy-shale soil. The depth is insignificant – from 1 m to 10 – 15 m. Moreover, to determine the cost, experimental technique has been developed. The technique involves classification of the amber fragments according to their form, dimensions, and colour. Lithologic-and-facies sections of sites of Klesiv deposit have been obtained.

Comparison of experimental and theoretical XEDS k-factors as a function of accelerating voltage

1990 ◽  
Vol 48 (2) ◽  
pp. 460-461
Author(s):  
Nestor J. Zaluzec
Keyword(s):  
Quantitative Analysis ◽  
Cross Section ◽  
Ionization Cross Section ◽  
Experimental Measurements ◽  
Energy Dispersive Analysis ◽  
Ionization Cross ◽  
Medium Voltage ◽  
K Factor ◽  
Analysis System ◽  
Lower Voltage

For nearly fifteen years k-factor measurements have been made by varying the composition of the standards at fixed accelerating voltage and measuring the change in the experimental k-factor with atomic number. From this data a “best model” of the ionization cross-section is frequently proposed for use in quantitative analysis, however it is valid only at that fixed voltage. Few if any studies seek to determine the systematic variation in the k-factor with accelerating voltage. In this paper experimental measurements of the variation in the k-factor as a function of accelerating voltage are reported. With the advent of medium voltage analytical microscopes routinely available to the microscopy community, it becomes essential to understand how the k-factor varies with accelerating voltage in order that errors in quantitative analysis can be avoided should experimental or theoretical k-factors from lower voltage instruments are applied to the medium voltage regime.Electropolished specimens of β-NiAl were studied in a Philips CM30T electron microscope, equipped with a Be-Window Si(Li) detector interfaced to an EDAX 9900 Energy Dispersive Analysis System.

Strain Analysis and Experimental Research of the Composite Beams

2013 ◽  
Vol 438-439 ◽  
pp. 654-657
Author(s):  
Ai Hong Han
Keyword(s):  
Comparative Analysis ◽  
Cross Section ◽  
Experimental Research ◽  
Strain Analysis ◽  
Composite Beams ◽  
Strain Measurements ◽  
Plane Cross Section ◽  
Strain Data ◽  
Steel Composite

Through the comparative analysis of theoretical and experiment results, this paper proved that the formulas for solving the strain of composite beams are correct, and the strain is consistent with the plane cross-section assumption. In order to reduce the influence of friction, resin membranes were placed in steel-steel composite beams and aluminum-steel composite beams. The strain measurements were performed on composite beams with and without adding resin, the influence of friction between the composite beams is analyzed by the comparison of strain data,.

Performance Analysis of GFRP/Steel Composite Box Beams

2012 ◽  
Vol 166-169 ◽  
pp. 716-719
Author(s):  
Yun Yu Li ◽  
Yan Lei Wang ◽  
Jin Ping Ou
Keyword(s):  
Cross Section ◽  
Low Cost ◽  
Volume Ratio ◽  
Shear Capacity ◽  
Steel Plates ◽  
Box Beam ◽  
Box Beams ◽  
New Type ◽  
Steel Composite ◽  
The Cost

To overcome the inadequacy such as the low stiffness, the weak shear capacity, brittle failure and the big initial cost in all FRP box beam, and to make use of the benefits of steel such as the high stiffness, the strong shear capacity, good ductility and the low cost, a new type of GFRP/steel composite box beam was proposed. A given GFRP box beam was used to investigate the effects of adding steel volume ratio (the ratio of steel volume to the total volume in the adding section) on the performance of the GFRP box beam by theoretical calculation, and the adding sections of steel plates for GFRP box beam included top and bottom flanges, and all cross-section, respectively. The analytical results indicate that the performance of GFRP box beam increases dramatically and the cost of beam remains almost unchanged after adding steel plates. At the same time, the performance of GFRP box beam is obviously more excellent by adding steel plates into the all cross-section compared with top and bottom flanges.

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