Railway spike screws are manufactured by hot forging on a massive scale, due to each kilometer of railway track needing 8600 screws. These components have low market value, so the head must be formed in single die stroke. The service life dies is directly related amount energy required form screw. existing standard for specifies only tolerances dimensions, particularly angle hub faces and radiu...

The Raychaudhuri equation is derived by assuming geometric flow in space–time M of n+1 dimensions. turns into a harmonic oscillator form under suitable transformations. Thereby, relation between geometrical entropy and mean geodesic deviation established. This has connection to chaos theory where the trajectories diverge exponentially. We discuss its application cosmology black holes. Thus, we ...

in this study, geometrical, gravimetrical and frictional properties of four common varieties of iranian canola seeds (namely: slm, hyola, okapi, orient), containing the mean moisture value of 6.5% (w.b.) were investigated. geometrical and gravimetrical properties included length, diameter, geometric mean diameter, sphericity, thousand seed mass, volume, true density, bulk density and porosity. ...

Tolerance plays a major role in the manufacturing industry, as it affects product design, manufacturing, and quality of the product. This paper considers product design, manufacturing, and quality simultaneously, and introduces a concurrent approach for tolerance allocation using evolutionary algorithms. A non-linear model that minimizes the combination of manufacturing cost and quality loss si...

This article proposes a general method to model and simulate the process of magnetic field mapping; aim our work is combination effect bench position uncertainty with measurements’ uncertainty. The based on study positioner kinematics using multi-body system approach. geometrical errors manipulator, including manufacturing tolerances assembling nonidealities are included in homogeneous transfor...

Salinity is rising in many southern African and Australian rivers with unknown effects on aquatic organisms. The extent of spatial variation, at any scale, in salt tolerances is unknown and therefore whether data from one location should be used elsewhere. The acute tolerances (72-hour LC50) to sea salt of 49 macroinvertebrate taxa from the south-east of the Eastern Cape (SEEC), South Africa we...

We present in this paper a new analysis of relative sensitivity/importance of calibra-tion/alignment parameters on the performance of stereoscopic depth reconstruction. This quantitative analysis provides formulae which relate diierent parameter errors to the 3D reconstruction measurements. The results of this analysis provide specii-cations of acceptable tolerances in individual calibration pa...

(a) Acceptable daily intake (ADI). The ADI for total residues of virginiamycin is 250 micrograms per kilogram of body weight per day. (b) Tolerances—(1) Swine. Tolerances are established for residues of virginiamycin in uncooked edible tissues of 0.4 part per million (ppm) in kidney, skin, and fat, 0.3 ppm in liver, and 0.1 ppm in muscle. (2) Broiler chickens and cattle. A tolerance for residue...