Characterization of Technical Surfaces With a Coupled SEM-EDA-Image Analyzer System

1985 ◽  
pp. 343-350
Author(s):  
E. Wallura ◽  
J. Linke ◽  
K. Koizlik ◽  
H. Nickel
Keyword(s):  
Image Analyzer

scholarly journals Characterization of parents and F1 seeds of rice hybrid KRH-4 using different chemical tests and seed image analyzer

2017 ◽  
Vol 12 (Special-5) ◽  
pp. 1261-1265
Author(s):  
P. RAJU ◽  
S.B. PATIL ◽  
S.N. VASUDEVAN ◽  
MOHHAMAD IBRAHIM ◽  
R.C. MATHAD
Keyword(s):  
Image Analyzer ◽  
Rice Hybrid

Microstructural Characterization of Rapidly Solidified Ti Modified 316 Stainless Steels for Irradiation Environments

1980 ◽  
Vol 38 ◽  
pp. 396-397
Author(s):  
L. Arnberg ◽  
J. B. Vander Sande
Keyword(s):  
Microstructural Characterization ◽  
Nucleation Site ◽  
Wall Material ◽  
Image Analyzer ◽  
X Ray ◽  
Helium Bubbles ◽  
Irradiation Performance ◽  
Rapidly Solidified ◽  
Electron Energy Loss

One of the prime candidates for a fusion reactor first wall material is Ti modified 316 stainless steel (0.32% Ti). The interface between TiC and the austenitic matrix has been shown to be a good nucleation site for helium formed during neutron irradiation, thus reducing swelling and preventing helium bubbles from forming elsewhere, e.g., at grain boundaries. This material and another alloy, where the TiC content has been increased, have been rapidly solidified (105K/sec) by means of a roller quencher to give a very fine dispersion of TiC. The effects of subsequent extrusion and thermomechanical treatment have been evaluated by TEM and STEM to give materials with optimum irradiation performance. The microstructures of alloys chosen for irradiation experiments have been carefully characterized by electron microscopy. The morphology, size, and distribution of different intermetallic phases have been studied by conventional TEM techniques and their compositions have been determined by energy dispersive X-ray- and electron energy loss spectroscopy. The size distribution of TiC particles have been determined using a computerized image analyzer.

Photometric Application of the Gram Stain Method To Characterize Natural Bacterial Populations in Aquatic Environments

1998 ◽  
Vol 64 (2) ◽  
pp. 742-747 ◽  
Author(s):  
H. Saida ◽  
N. Ytow ◽  
H. Seki
Keyword(s):  
Wall Structure ◽  
Image Analyzer ◽  
Gram Stain ◽  
Bacterial Populations ◽  
Charge Coupled Device ◽  
Gram Positive Bacteria ◽  
A Charge ◽  
Dichotomous Classification

ABSTRACT The Gram stain method was applied to the photometric characterization of aquatic bacterial populations with a charge-coupled device camera and an image analyzer. Escherichia coli andBacillus subtilis were used as standards of typical gram-negative and gram-positive bacteria, respectively. A mounting agent to obtain clear images of Gram-stained bacteria on Nuclepore membrane filters was developed. The bacterial stainability by the Gram stain was indicated by the Gram stain index (GSI), which was applicable not only to the dichotomous classification of bacteria but also to the characterization of cell wall structure. The GSI spectra of natural bacterial populations in water with various levels of eutrophication showed a distinct profile, suggesting possible staining specificity that indicates the presence of a particular bacterial population in the aquatic environment.

Microstructural Characterization of the Emulsified Cu47Ti33Zr11Ni6Sn2Si1 Alloy Powder

2006 ◽  
Vol 118 ◽  
pp. 623-634
Author(s):  
Ho Suk Kang ◽  
Hee Sam Kang ◽  
Woo Young Yoon
Keyword(s):  
Electron Microscopy ◽  
Alloy Powder ◽  
Microstructural Characterization ◽  
Image Analyzer ◽  
Phase Selection ◽  
Transmission Electron ◽  
Droplet Emulsion ◽  
Microstructural Morphology ◽  
Fraction Measurement

Phase selection and microstructural morphology change of the Cu47Ti33Zr11Ni6Sn2Si1 alloy were investigated through the droplet emulsion technique(DET). The emulsified Cu47Ti33Zr11Ni6Sn2Sil alloy powders showed several different microstructures depending on the amount of undercooling. The amount of undercooling of the powders was monitored by differential thermal analysis and was matched with the microstructures. The phase transition of Cu47Ti33Zr11Ni6Sn2Sil alloy powders according to the increase of undercooling proceeds by the process Cu4Ti3 +CuTi +Cu2Ti +Cu51Zr14 → Cu4Ti3 + CuTi + Cu2Ti + Cu51Zr14 + CuTi2 → Cu2Ti + Cu51Zr14 + CuTi2 → Cu51Zr14 +CuTi2. Specifically, the morphology and scale of the CuTi2 phase were examined by SEM observation, and area fraction measurement using an image analyzer, transmission electron microscopy studies, and microhardness tests showed that the amorphous phase could be synthesized by DET. A microstructure selection map of Cu47Ti33Zr11Ni6Sn2Sil alloy powders for tailored solidification was also suggested.

Characterization of Aggregate Angularity in the Frequency Domain

2020 ◽  
Vol 2674 (10) ◽  
pp. 324-334
Author(s):  
Hongbin Xu ◽  
Jorge A. Prozzi ◽  
Moo Yeon Kim ◽  
Joaquin Bernardo Hernandez
Keyword(s):  
Frequency Domain ◽  
Prediction Models ◽  
Image Analyzer ◽  
Visual Rating ◽  
Structural Capacity ◽  
Aggregate Morphology ◽  
Pavement Structures ◽  
Pavement Construction ◽  
Survey Responses

The morphology of aggregate particles used for pavement construction plays an essential role in the structural capacity and safety performance of pavement structures. Each of the three main components of aggregate morphology (form, angularity, and texture) has a distinct effect on pavement performance and corresponds to a different frequency range. Considering the challenge in segregating form, angularity, and texture in the space domain, characterizing them separately in the frequency domain would be beneficial and would allow for a more objective and detailed classification system for aggregate morphology. This study focuses on the characterization of aggregate angularity in the frequency domain with the objective of obtaining a parameter that is free of individual subjectivity. Since aggregate angularity is a subjective visual descriptor of aggregate shape variations at corners, a survey was conducted of pavement engineers to collect visual ratings of aggregate angularities using a set of aggregates. Thereafter, using the average visual ratings from the survey responses as reference, three common aggregate angularity indexes were evaluated: roundness, the University of Illinois Aggregate Image Analyzer (UIAIA) angularity index, and the Aggregate Image Measurement System (AIMS) angularity index. In addition, with the aid of the discrete Fourier transform (DFT) algorithm, the contributing frequencies were acquired for visual rating, along with roundness and the UIAIA and AIMS angularity indexes. Based on the contributing frequencies identified, prediction models were successfully established for visual rating: roundness and the UIAIA and AIMS angularity indexes. It was concluded that DFT can be accurate in objectively assessing angularity and that roundness is the more robust parameter and can be accurately predicted by the models developed.

Synthesis and Characterization of Nanostructured Materials Prepared from SiO2 and GeO2 Mixture by Carbon Assisted Method

2008 ◽  
Vol 55-57 ◽  
pp. 637-640 ◽  
Author(s):  
Pattanasuk Chamninok ◽  
P. Kasian ◽  
Pichet Limsuwan ◽  
Udom Tipparach ◽  
S. Samran ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Silicon Dioxide ◽  
Nanostructured Materials ◽  
Thermal Evaporation ◽  
Synthesis And Characterization ◽  
Image Analyzer ◽  
Evaporation Process ◽  
Stereo Microscope ◽  
Scanning Electron

Nanostructured materials were synthesized by thermal evaporation process using silicon dioxide and carbon from coconut shell charcoal or graphite mixed with GeO2 by the ratio of 5:1:1 at temperature 1200 oC in one atmosphere of nitrogen for 3 hours. The nanostructured materials were characterized by the stereo microscope (image analyzer) and scanning electron microscope. The diameters of nanowires vary from 10 nm to 50 nm and length of several 10 micrometers. Length of nanorods was around 15 micrometers and diameters vary from 10 nm to 100 nm.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

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