摘要:

Uranium dioxide fuel with initial grain sizes from 8 to 80 μm was irradiated at linear ratings of 50 to 65 kW/m to a maximum burnup of 230 MW*h/kg U (10000 MW.d/metric ton U). At a linear power of 50 kW/m, where grain growth is not significant, a large initial grain size reduced fission gas release; above 50 kW/m, the results were inconclusive, but a large initial grain size appeared less effective in reducing release

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10620.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Strength and fatigue characteristics of fluoride glass optical fibers, used as a new infrared transmission medium, were examined. A correlation parameter between mirror size and tensile strength of 0.826 MPa.m12was obtained, and a fatigue parameter of 16.2 was determined from a dynamic fatigue test at 20°C and 60% rh

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10621.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

A study of the high‐alkali region of glass formation in the system Na2O +B2O3reveals that retention of CO2from carbonate starting materials can become a serious preparative problem at the high‐alkali extreme. Results presented for glasses prepared using both Na2O and Na2CO3show that residual CO2can lead to major differences in physical properties which in this work are represented by the viscosity‐related glass transition temper

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10622.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The rate of growth of a beta alumina reaction layer at an interface between alpha alumina and sodium aluminate was determined. The data for the growth of this reaction layer were found to obey a parabolic rate law. Further analysis of the data indicated that the reaction is controlled by oxygen diffusivity in beta alumina.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10623.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

X‐ray density measurements and two‐color powder displacement observations were used to determine the reliability of the cylindrical test cell as a source of data for a plasticity model of granular materials. Calculations with such a model agree well with the experimental density distribution, for the cylindrical test cell itself and for a cylindrical die, compacted from one side by means of a profiled plun

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10624.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Concern over the low resistance of teflon to radiation‐induced damage leads to the requirement that, when teflon leach vessels are used, the exposure limit is 1 × 105rad of beta or gamma radiation during a leach experiment. This limit is supported for MCC 76–68 simulated waste glass by the present investiga

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10625.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The homogeneous shear necessary to reorient a lattice into twin orientation can be calculated precisely from crystallographic lattice dimensions. Measurement of the surface tilt produced by rhombohedral twins in Al2O3agrees well with the calculated value, indicating that significant additional shear from the motion of glide dislocations is not contributing to twin deformation.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10626.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Crystallographic relations between the two solid solutions forming the eutectic of the system NiO‐CaO were studied by X‐ray diffraction and scanning electron microscopy. The ionic arrangement at the phase interface can be described by alternate (111) planes of metal and close‐packed oxygen

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10627.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The influence of grain‐boundary density on the resistivity of grains and grain boundaries in stabilized zirconia films, made by a modified doctor blade method using Al2O3as a sintering agent, was investigated at 300° to 500°C. Only cubic zirconia was detected by X‐ray diffraction. However, electron probe microanalysis showed that the Al concentration was preferentially enriched near grain boundaries. The resistance per square centimeter of grain‐boundary surface decreased with increasing grain‐boundary density in the range 170 to

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10628.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Two piezoelectric materials were investigated in electric fields, up to 3 kV/cm to determine whether single‐sample testing can be used to evaluate piezoelectric coupling. Autocorrelation analysis of the data showed that the minimal increment of electric field necessary for successive independent measurements on single specimens is 1.3 kV /cm. This value coincides with the breakage field of the sample at resonance. Electrumechanical performance can still be evaluated with a sampling interval slightly lower than 1.3 kV/c

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10629.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY