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Paper des Monats
- ja (93)
Adhesion bonding at a bimetallic interface is considered in terms of the electronic structure of combined metals in a highly simplified model. If specific surface properties are neglected, the contact area may be interpreted by a `jellium' model of thinned atom cores smeared on the interface and imbedded in a thinned sea of electrons. Adhesion bond strength will then depend primarily on free-electron density. In addition to the free-electron `jellium' formalism, the electronic structure of metals and the character (s, p, d) of electrons free for adhesion bonding must be considered. For metal single crystals an influence of the structure of the Fermi surface can also be pointed out. The adhesional pairs of dissimilar metals are assumed to fall into line with groups of `donor-acceptor' combinations of different strengths of adhesion.
A new device for simultaneous measurement of friction force, normal force and friction coefficient
(1975)
Rapid Measuring Techniques for Electrical Contact Resistance Applied to Lubricant Additives Studies
(1976)
Failure criteria in thin film lubricatio - investigation of the different stages of film failure
(1976)
Rapid Measuring Techniques for Electrical Contact Resistance Applied to Lubricant Additives Studies
(1976)
Influence of Asperity Contact Conditions on the Failure of Sliding Elastohydrodynamic Contacts
(1977)
Influence of Asperity Contact Conditions on the Failure of Sliding Elastohydrodynamic Contacts
(1977)
A systems analysis data sheet for friction and wear tests and an outline for simulative testing
(1977)
Recommended Reference Materials for Realization of physicochemical properties - Section: Reflectance
(1978)
A simple model for predicting energy dissipation of thin plates being perforated by "hard" missiles
(1979)
Influence of the plastic deformation of metals during mixed friction on their chemical reaction rate
(1981)
Current Aspects of Tribology
(1982)
Contribution to the ultrasonic detection and sizing of inner wall surface breaking cracks in pipes
(1984)
In a cooperative testing of polymer blends of polycarbonate (PC) and linear low-density polyethylene (LLDPE), 17 laboratories from six countries contributed measurements of differential scanning calorimetry (DSC) or differential thermal analysis (DTA) and of thermogravimetric analysis (TGA). This work is part of the activity of the VAMAS* Technical Working Party-Polymer Blends (TWP-PB), which provided the samples and coordinated the tests. Thermal analysis proved to be a, rapid means of assessing the miscibility of polymers using small samples. The system PC/LLDPE investigated in this test is found immiscible. The results of this cooperative test are a basis to elaborate a standard procedure for the characterization of polymer blends.
Tribology at BAM: a survey
(1989)
Tribology of polymers
(1989)
The spherical bottom of BWR-pressure vessels contains holes for the nozzles of control rods and instrumentation. Up to now the detectable areas for the ultrasonic inspection are the accessible ligaments between the nozzles with an orientation parallel and transverse to the manipulator rails. Some licensing authorities demand an inspection technique capable of reliably detecting significant crack initiation in all critical areas near the cladding of the spherical inner surface. By order and in cooperation with the Hamburgische Electricitätswerke (HEW) we have developed a computer controlled equipment with two ultrasonic probes containing four linear arrays and a digitized A-scan storage for documentation and evaluation of inspection results. The manipulator guided probe movement in the paths between the nozzles of the spherical bottom is controlled by a computer program. This program determines for each array system and for each coupling position the beam angle as a function of the variable skewing angle to realize detection conditions suited to possible crack positions at the longitudinal, transverse and diagonal ligaments between the nozzles for control rods and instrumentation.
If the intramolecular distance between the two isoenergetic chromophores of a bichromophoric compound is much smaller than the Förster radius of excitation energy transfer (EET), the probability to fluoresce is equal for both chromophores, because the EET takes place at a shorter time compared with the nanosecond timescale of the fluorescence lifetime. Then, the fluorescence depolarization of diluted solid solutions of such bichromophoric molecules can be measured with stationary excitation and used to evaluate the orientation between the two chromophores; in the most simple case the angle between their main axes is determined. Model calculations for bichromophoric alkane compounds with various conformational freedom reveal the amount of depolarization and thus the limits of the method. The results are compared to experimental data of 1,3-di(N-carbazolyl)-propane and 1,2-trans-di(N-carbazolyl)cyclobutane.