scholarly journals Automatic Determination of Secondary Dendrite Arm Spacing in AlSi-Cast Microstructures

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2827
Author(s):  
Christian Gawert ◽  
Rüdiger Bähr
Keyword(s):  
Computation Time ◽  
Automatic Measurement ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing ◽  
Aluminum Cast Alloys ◽  
Cast Alloys ◽  
The Individual ◽  
Good Agreement

A new procedure for the automatic measurement of the secondary dendrite arm spacing (SDAS) from microscopic images is presented. The individual primary and secondary dendrite arms are identified through suitable segmentation techniques and clustered in such a way that dendritic structures are obtained suitable for SDAS measurement. The algorithms are applied to two different hypoeutectic aluminum cast alloys, and the quality of the measurements obtained is assessed through a comparison to manually measured SDAS values. A good agreement between the automated measurements and the distribution of manual measurements is found for both cast structures considered. In addition, a decrease in computation time is observed which allows for an increase in measurement density that is used to characterize the microstructures.

Automation of selected brazes' dynamic properties in high-temperatures' measurement process

2013 ◽  
Vol 18 (2-3) ◽  
pp. 33-41
Author(s):  
Dominik Sankowski ◽  
Marcin Bakala ◽  
Rafał Wojciechowski
Keyword(s):  
Surface Tension ◽  
High Temperatures ◽  
Dynamic Properties ◽  
Automatic Measurement ◽  
Measurement Methodology ◽  
Joining Process ◽  
Wetting Force ◽  
Research Grant

Abstract The good quality of several manufactured components frequently depends on solidliquid interactions existing during processing. Nowadays, the research in material engineering focuses also on modern, automatic measurement methods of joining process properties, i.a. wetting force and surface tension, which allows for quantitative determination of above mentioned parameters. In the paper, the brazes’ dynamic properties in high-temperatures’ measurement methodology and the stand for automatic determination of braze’s properties, constructed and implmented within the research grant nr KBN N N519 441 839 - An integrated platform for automatic measurement of wettability and surface tension of solders at high temperatures, are widely described

scholarly journals Single-sided NMR for the measurement of the degree of cross-linking and curing

2018 ◽  
Vol 7 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Norbert Halmen ◽  
Christoph Kugler ◽  
Eduard Kraus ◽  
Benjamin Baudrit ◽  
Thomas Hochrein ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Curing Kinetics ◽  
Cross Linking ◽  
Scanning Calorimetry ◽  
First Results ◽  
Non Destructive ◽  
Kinetics Of ◽  
Good Agreement

Abstract. The degree of cross-linking and curing is one of the most important values concerning the quality of cross-linked polyethylene (PE-X) and the functionality of adhesives and resin-based components. Up to now, the measurement of this property has mostly been time-consuming and usually destructive. Within the shown work the feasibility of single-sided nuclear magnetic resonance (NMR) for the non-destructive determination of the degree of cross-linking and curing as process monitoring was investigated. First results indicate the possibility of distinguishing between PE-X samples with different degrees of cross-linking. The homogeneity of the samples and the curing kinetics of adhesives can also be monitored. The measurements show good agreement with reference tests (wet chemical analysis, differential scanning calorimetry, dielectric analysis). Furthermore, the influence of sample temperature on the characteristic relaxation times can be observed.

Determination of Adhesion Forces Between Smooth and Structured Solids

2012 ◽  
Author(s):  
Hartmut R. Fischer ◽  
Edwin R. M. Gelinck
Keyword(s):  
Adhesion Force ◽  
Smooth Surfaces ◽  
Adhesion Forces ◽  
Real Area Of Contact ◽  
Study Results ◽  
Colloidal Probes ◽  
Good Agreement ◽  
Real Area

The tendency of smooth surfaces to stick spontaneously to each other is becoming a serious problem, with: a) the increasing quality in surface finish for many components and systems, b) on miniaturization in mechanical components, and c) in demanded precision of positioning of parts in high-end equipment machines and systems. Surfaces tend to be made smoother in order to gain flatness or in order to fulfill the need for more precise and reproducible positioning of parts. Adhesion or even sticking of the surfaces is a major showstopper for these applications. There are several measures that can be taken in order to reduce spontaneous adhesion. Quantification of the effectiveness of the chosen solution is most often done using an AFM with probes varying from 1 nm to 8 micron of contact diameter. A serious disadvantage in measuring adhesion by sharp tips is the wear of the tips. Sharp tips wear easily, resulting in undefined contact areas. When the real area of contact is not well defined, the quantification of the adhesion force is not significant. In the current study results of AFM measurements from literature with different tip diameters of colloidal probes are compared with measurements we performed using AFM cantilevers with a plateau tip and using probes from large spheres using an alternative setup (UNAT). These methods give results that are in good agreement with values found in literature. Large contacting surface enhance the quality of the measured adhesion values. Another part of the study deals with a deliberately roughening of smooth surfaces to minimize (spontaneous) adhesion. Good agreement has been found with existing results. For the use of larger surfaces it is important that the surfaces to be tested are extremely clean. Particles on smooth surface do influence the measurements quite easily. Especially for larger areas, the possibility of encountering particles on the surface are more likely, when particles are present. For the measurements in this study a lot of care has been taken therefore to remove contamination: particles as well as contamination of organic origin.

An Improved Periodic Acid Fuchsin Sulfite Staining Method for Evaluation of Glycoproteins

1958 ◽  
Vol 4 (6) ◽  
pp. 476-483 ◽  
Author(s):  
Warren F McGuckin ◽  
Bernard F McKenzie
Keyword(s):  
Hydrochloric Acid ◽  
Periodic Acid ◽  
Distribution Patterns ◽  
Paper Electrophoresis ◽  
Acid Control ◽  
Chemical Determination ◽  
Disease Entities ◽  
The Individual

Abstract Modification of the Köiw and Grönwall procedure for the staining of glycoproteins separated by paper electrophoresis has adapted this method to papers of the Whatman 3MM class, with achievement of results comparable to those reported by direct chemical determination of hexose in the individual protein fractions. Preliminary concentration of specimen fluids was achieved by ultrafiltration through collodion sacks. A preliminary wash of the oven-dried paper strips with 95 per cent ethanol was found essential to clear the paper of buffer salts and insure that the pH in the oxidation procedure remained in the 3.0-3.5 range. Close control of the reagent composition and timing of each step were found necessary. Inclusion of 40 per cent ethanol in the oxidation bath and immersion of dry strips were required to insure rapid penetration of the periodic acid. Control of the oxidation procedure at 20 ± 0.5° for 12 minutes was of prime necessity to maintain a low background color. Also, the concentrations of hydrochloric acid in the dye bath and in the wash solutions were found to affect the quality of the final stain. The ethanol wash served to remove residual sulfite and hydrochloric acid and stabilize the color. The new method has been applied to the analysis of several body fluids of normal persons and patients with certain disease entities, and satisfactory glycoprotein distribution patterns have been obtained.

Numerical Determination of Secondary Dendrite Arm Spacing for IN738LC Investment Castings

2010 ◽  
Vol 42 (7) ◽  
pp. 1847-1853 ◽  
Author(s):  
M. M. Franke ◽  
R. M. Hilbinger ◽  
C. H. Konrad ◽  
U. Glatzel ◽  
R. F. Singer
Keyword(s):  
Numerical Determination ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing

GAMBARAN KUALITAS HIDUP LANSIA

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Nuram Mubina
Keyword(s):  
Quality Of Life ◽  
The Elderly ◽  
Natural Process ◽  
Research Subjects ◽  
Elderly Individuals ◽  
Important Concern ◽  
The Gift ◽  
The Individual

This study aims to determine the quality of life of the elderly. The elderly have serious problems in the physical, mental, and social areas. This problem is closely related to life expectancy and quality of life of the individual. The quality of life of the elderly should be an important concern for health professionals because it can be a reference for the success of an action, intervention, or therapy. The aging process is a natural process that can not be prevented and is a natural thing experienced by people who are given the gift of long life, where everyone hopes to live a calm and peaceful life. The purpose of this study is to understand the quality of life of the elderly in Karawang. The subjects of this study were five elderly people. Determination of research subjects is done by purposive technique. Data mining was carried out through in-depth observations and interviews which resulted in the conclusion that the five elderly individuals experienced the most severe problems in the declining physical condition. The condition then affects the psychological condition and social interaction it has   Keywords: Quality of Life, Elderly.   Penelitian ini bertujuan untuk mengetahui gambaran kualitas hidup lansia. Lansia memiliki masalah serius pada area fisik, mental, dan sosial. Masalah tersebut berkaitan erat dengan harapan hidup dan kualitas hidup individunya. Kualitas hidup lansia seharusnya menjadi perhatian penting bagi para profesional kesehatan karena dapat menjadi acuan keberhasilan dari suatu tindakan, intervensi, atau terapi. Proses penuaan merupakan suatu proses alami yang tidak dapat dicegah dan merupakan hal yang wajar dialami oleh orang yang diberi karunia umur panjang, dimana semua orang berharap akan menjalani hidup dengan tenang dan damai. Tujuan penelitian ini adalah untuk memahami kualitas hidup lansia di Karawang. Subjek penelitian ini berjumlah lima orang lanjut usia. Penentuan subjek penelitian dilakukan dengan teknik purposive. Penggalian data dilakukan melalui observasi dan wawancara mendalam yang menghasilkan kesimpulan bahwa kelima individu lansia mengalami permasalahan paling berat pada kondisi fisik yang telah menurun. Kondisi tersebut kemudian berpengaruh pada kondisi psikologis dan interaksi sosial yang dimilikinya   Kata Kunci: Kualitas Hidup, Lansia

scholarly journals Elemental Composition of Norwegian Rivers

1979 ◽  
Vol 10 (2-3) ◽  
pp. 115-140 ◽  
Author(s):  
B. Salbu ◽  
A. C. Pappas ◽  
E. Steinnes
Keyword(s):  
Geometric Mean ◽  
Ore Deposits ◽  
Weighted Mean ◽  
Mean Values ◽  
Marine Deposits ◽  
Water Composition ◽  
Alkaline Earths ◽  
The Individual ◽  
Good Agreement

Instrumental neutron activation analysis has been applied for the determination of up to 40 elements in waters from eleven Norwegian rivers. In order to represent the composition of an average river in the region of Norway and possibly the greater part of the Scandinavian peninsula, weighted mean values are calculated on the basis of geometric mean values and discharge of the individual rivers. Factor analysis shows that Cambro-Silurian sedimentary and vulcanic rocks influence the water composition considerably compared to Precambrian gneisses and granites. An influence of airborne supply is evident in coastal areas. In addition ore deposits are important for Zn and associated elements. Comparison with literature data from Sweden shows good agreement for the elements concerned. The present values concerning alkalies, alkaline earths and halogens are, however, significantly lower than the estimated “world averages”. This is probably due to a low abundance of marine deposits and sedimentary rocks in Scandinavia. Low values are also found for elements which are often associated with particulate matter (Fe, Al, V, Mo, As, Sb, Th, U), while the values obtained for rare earths (La, Ce, Sm) and some additional elements (Sc, Mn, Au) are significantly higher than the estimated “world averages”.

The Angara-2 acoustic-emission apparatus for determination of the hydrogen content in melted aluminum cast alloys

2007 ◽  
Vol 43 (1) ◽  
pp. 39-42 ◽  
Author(s):  
V. B. Vorontsov ◽  
A. V. Gorchinskii ◽  
A. N. Yanchenko ◽  
M. G. Ardashov
Keyword(s):  
Acoustic Emission ◽  
Hydrogen Content ◽  
Aluminum Cast Alloys ◽  
Cast Alloys

scholarly journals Viticulture Zoning in Montenegro

2018 ◽  
Vol 75 (1) ◽  
pp. 73 ◽  
Author(s):  
Svetozar SAVIĆ ◽  
Miško VUKOTIĆ
Keyword(s):  
Sensory Evaluation ◽  
Climatic Factors ◽  
Vitis Vinifera L ◽  
Climatic Parameters ◽  
The Individual ◽  
Bodies Of Water ◽  
Physiological Reactions ◽  
Climatic Characteristics

Montenegro’s viticultural regions and sub-regions were defined in the 2007 Law on Wine, based on the country’s empirical, traditional, historical and social heritage. However, during the process of defining these regions and sub-regions, the influence of climatic and soil factors crucial in the determination of dependent characteristics, such as the physiology of the grapevine and the quality of the grapes and wine, was not researched thoroughly enough. This work presents the climatic characteristics of the existing sub-regions, as well as the results of the climate’s impact on the physiological reactions of the most common domestic grape cv. Vranac (Vitis vinifera L.), facilitating a new viticultural zoning in Montenegro. Over a period of 56 years, the following climatic parameters were analysed: air temperature, precipitation, insolation and air humidity. These parameters suggest that all the sub-regions in Montenegro have uniform climatic parameters. The modification of certain climatic parameters is influenced by two large bodies of water – the Adriatic Sea and Lake Skadar – and by altitude. The duration of the individual phases and vegetation of the Vranac grape variety differed only slightly in the different sub-regions. As a reflection of the influence of climatic factors in different locations, Vranac grape and wine was analysed chemically and given a sensory evaluation. The analysed parameters indicate a nearly uniform chemical composition and sensory evaluation of all wines. Wines produced at lower altitudes were distinctive for their superior quality.

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