New compact wideband bandpass filter using three parallel-coupledlines

A new miniature bandpass filter, comprising three-conductor short-circuited spurline resonators of approximately a quarter-wavelength long, with a very wide bandwidth approaching multioctaves is reported for the first time. The chain matrix of the filter resonator is derived. The new filter has been developed using microstrip line with less than 1 dB insertion loss over a passband from 2 to 8 GHz. Reasonably good agreement between the measured and calculated results is observed     

Post-deposition treatment effects on hydroxyapatite vacuum plasma spray coatings

The purpose of this work is to evaluate the effects of post-deposition heat treatments on high and low crystallinity hydroxyapatite coatings on Ti6Al4V alloy. HA layers were produced by the vacuum plasma spray (VPS) technique, and the desired degrees of crystallinity were obtained by changing the deposition parameters. An analysis of the mechanical properties of the coatings and their adhesion to the substrate has been done by shear strength test. X-ray diffraction analysis was used to detect the structure and the chemical components in which HA dissociates during the deposition process and heat treatments. The data obtained indicates that heat treatments can increase the crystallinity of HA, but they also introduce a mechanical degradation of the coatings. After heat treatments, it was also observed that a large amount of tetracalcium phosphate was formed.     

Measurements to distinguish fuel elements with and without thorium content by gammaspectrometry in hot cells

The T1208 inventory in a HTR fuel element is transmuted from Th232. By measuring the T1208 gamma radiation in a suitable scan configuration it is possible to distinguish fuel elements with and without Thorium contents non-destructively even after a long cooling time.     

Superconductivity in heavy-electron metals

Some of the most outstanding experimental evidences for unconventional superconductivity in heavy-electron materials are rewiewed and discussed.     

Characterization of the flow behaviour of sausage emulsions with a simple tube viscometer

A specially designed tube viscometer was used to measure apparent viscosity during flow of Bologna type sausage emulsions moving through a pipe. Emulsions varied in fat content (from 21.8 to 44.3%) and in moisture/protein ratio (from 3.7 to 5.6), and the effects of added sodium chloride, sodium diphosphate, starch and blood plasma were investigated in a 36% fat, 3.7 moisture/protein emulsion.
The shear stresses determined as a function of shear rate were fitted by a power law. Yield stress of the emulsions was negligible relative to the applied stress. However, inspection of the flow profiles indicated that considerable slip of the sausage emulsion occurred at the pipe wall. Both emulsion flow and slip contribute to overall flow behaviour, so a kind of effective viscosity is determined. Intrinsic rheological properties and wall slip will both be affected by the composition of the sausage emulsion.     

I(t) technique for generation rate determination in implanted MOSstructures

A technique for evaluating the generation rare profile of MOS structures based on the measurement of gate current transients at two different gate voltage waveforms in non-equilibrium nonsteady-state is presented. The method allows the evaluation of the generation rate profile in the bulk of inhomogeneously doped MOS structures without requiring knowledge of the doping profile and provides, in contrast to high frequency methods, reliable results in such cases where MOS structures with high series resistances are to be investigated     

Method of selecting the regularisation parameter for microwaveimaging

The Tikhonov regularisation technique is widely used in the solution of inverse scattering problems. One of the difficulties in applying this technique is the proper selection of the associated regularisation parameter. Based on a stochastic model of the reconstruction process, a simple method is presented for selecting this parameter for an efficient implementation of various microwave imaging methods     

The adhesive joint fracture due to crack propagation affected by heat and active agent concentration

The problem of fracture of the adhesive joint between two elastic bodies, due to crack propagation along the joint, acted upon by heat and active agent flux through the crack surfaces is considered. Temperature and concentration of the agent inside the crack are assumed to be constant, which implies comparatively low flux conductivity of adjacent materials. The effect of an additional flux resistance concentrated at the crack surfaces is considered. This resistance is due to the adhesive layer remnants, and causes the temperature and concentration in materials at the crack edge to be dependent on the crack speed. The effect of the applied loads on deforming the materials is supposed to be sufficiently large to neglect influence of temperature and concentration on deformations. The reverse influence, as well as cross-influence of heat and concentration transfer on each other, are also neglected. The only mechanical role played by temperature and concentration of the agent under such circumstances is their influence on fracture of the adhesive joint.