scholarly journals Comparative Study of Thick Film Dielectrics

1983 ◽  
Vol 10 (4) ◽  
pp. 295-309
Author(s):  
Walter Vermeirsch
Keyword(s):  
Chemical Composition ◽  
Comparative Study ◽  
Thick Film ◽  
Reliable Method ◽  
Flow Behaviour ◽  
Sem Observation ◽  
Bulk Porosity ◽  
The Cross ◽  
Voltage Breakdown

SEM–observation and analysis provide a quick and reliable method of predicting the cross-over and multilayer characteristics of a dielectric paste. Surface and bulk porosity, flow behaviour and chemical composition, determined by SEM are closely related to the results of electrical and environmental tests. From the latter, voltage breakdown and humidity tests should be selected as most suitable for the comparison of various systems.

Comparative Study of Thick Film Dielectrics

1982 ◽  
Vol 1 (1) ◽  
pp. 11-16 ◽  
Author(s):  
W. Vermeirsch
Keyword(s):  
High Resolution ◽  
Comparative Study ◽  
Thick Film ◽  
Fine Line ◽  
Test Programme ◽  
Bulk Porosity ◽  
Sem Study ◽  
Chip Carrier ◽  
Selection Of

Increasing density requirements urge the thick film hybrid manufacturers to print high resolution patterns and to consider the application of multilayer hybrids. The introduction of compact interconnection technologies such as TAB and chip carrier will no doubt accelerate this process. Paste manufacturers are carrying out research to develop inks suited for fine line printing. The properties of dielectric pastes, necessary for multilayer applications, have not been studied so extensively. A programme was initiated to compare various dielectrics in combination with various conductors. From the test programme two tests were found to be most significant for the dielectric's characterisation. These tests, in combination with an SEM‐study of surface and bulk porosity, permitted a quick and reliable selection of an appropriate dielectric paste to be made.

A Comparative Study of the in vivo Distribution of 32P-Polyphosphates and 32P-Orthophosphate

1972 ◽  
Vol 11 (01) ◽  
pp. 70-78
Author(s):  
Esther Miller ◽  
Leopoldo Anghileri
Keyword(s):  
Radiation Dose ◽  
Comparative Study ◽  
Soft Tissues ◽  
Tumor Bearing ◽  
In Vivo Distribution ◽  
The Cross ◽  
Total Body

SummaryThe distribution of 32P-polyphosphates (lineal and cross-linked) and 32Porthophosphate in normal and tumor bearing animals has been studied. Differences between the cross-linked and the lineal form are related to a different degree of susceptibility to the hydrolysis by the phosphatases. In contrast to orthophosphate, the polyphosphates showed a lower accumulation in soft tissues which gives an advantageous reduction of the total body radiation dose.

scholarly journals Chemical composition of volatiles from male and female specimens of Baccharis trimera collected in two distant regions of southern brazil: a comparative study using chemometrics

Química Nova ◽  
2013 ◽  
Vol 36 (8) ◽  
pp. 1096-1100 ◽  
Author(s):  
Michele Aparecida Besten ◽  
Domingos Sávio Nunes ◽  
Alberto Wisniewski Jr. ◽  
Sávio Luis Sens ◽  
Daniel Granato ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Comparative Study ◽  
Southern Brazil ◽  
Male And Female ◽  
Baccharis Trimera

scholarly journals Analysis of Chemical Composition Homogeneity in the Cross-section of the Rods Produced from Alloys of 6xxx Group

2020 ◽  
Vol 66 (3) ◽  
pp. 139-148
Author(s):  
Maja Vončina ◽  
Peter Cvahte ◽  
Ana Kračun ◽  
Tilen Balaško ◽  
Jožef Medved
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Cross Section ◽  
Cross Sections ◽  
Intermetallic Phases ◽  
Scanning Calorimetry ◽  
Good Corrosion Resistance ◽  
Energy Dispersion Spectrometer ◽  
High Casting Speed ◽  
The Cross

AbstractThe alloys from Al–Mg–Si system provide an excellent combination of mechanical properties, heat treatment at extrusion temperature, good weldability, good corrosion resistance and formability. Owing to the high casting speed of rods or slabs, the solidification is rather non-equilibrium, resulting in defects in the material, such as crystalline segregations, the formation of low-melting eutectics, the unfavourable shape of intermetallic phases and the non-homogeneously distributed alloying elements in the cross-section of the rods or slabs and in the entire microstructure. The inhomogeneity of the chemical composition and the solid solution negatively affects the strength, the formability in the warm and the corrosion resistance, and can lead to the formation of undesired phases due to segregation in the material. In this experimental investigation, the cross-sections of the rods from two different alloys of the 6xxx group were investigated. From the cross-sections of the rods, samples for differential scanning calorimetry (DSC) at three different positions (edge, D/4 and middle) were taken to determine the influence of inhomogeneity on the course of DSC curve. Metallographic sample preparation was used for microstructure analysis, whereas the actual chemical composition was analysed using a scanning electron microscope (SEM) and an energy dispersion spectrometer (EDS).

Sign in / Sign up

Export Citation Format

Share Document