Factors Affecting Vocational Guidance

It is the special purpose of this study to find how personality factors affect the employability of youth. In a study of this kind it is necessary to consider the personality as a whole in relation to a larger situation, the ethnological traits of the group, the society in which the youth lives, the economic changes taking place in the community, and the physical and mental capacities in which he is endowed

Mechanistic Considerations Used in the Development of the PROFIT PCI Failure Model

A fuel Pellet-Zircaloy Cladding (thermo-mechanical-chemical) Interactions (PC!) failure model for estimating the probability of failure in !ransient increases in power (PROFIT) was developed. PROFIT is based on 1) standard statistical methods applied to available PC! fuel failure data and 2) a mechanistic analysis of the environmental and strain-rate-dependent stress versus strain characteristics of Zircaloy cladding. The statistical analysis of fuel failures attributable to PCI suggested that parameters in addition to power, transient increase in power, and burnup are needed to define PCI fuel failures in terms of probability estimates with known confidence limits. The PROFIT model, therefore, introduces an environmental and strain-rate dependent strain energy absorption to failure (SEAF) concept to account for the stress versus strain anomalies attributable to interstitial-disloction interaction effects in the Zircaloy cladding. Assuming that the power ramping rate is the operating corollary of strain-rate in the Zircaloy cladding, then the variables of first order importance in the PCI fuel failure phenomenon are postulated to be: 1. pre-transient fuel rod power, P{sub I}, 2. transient increase in fuel rod power, {Delta}P, 3. fuel burnup, Bu, and 4. the constitutive material property of the Zircaloy cladding, SEAF

ZIRCONIUM CLADDING OF URANIUM

Under proper conditions of vacuum and mold preheat, a sound ductile alloy bond can be achieved by casting molten uranium into zirconium and Zircaloy- 2 molds. Investigations indicate that a process for production of zirconium of Zircaloy-2 clad fuel elements can be developed by casting directly into preformed shells. Employment of cast bonding techniques appears to be a simple and practical method for assembling extrusion billets. It also appears that coextrusion of cast bonded normal uranium billets produces a clad rod exhibiting a rather uniform cladding thickness and map permit greater freedom in selection of extrusion conditions to produce a clad and bonded geometry. Forming of cast bond ingots in diamond-round or oval-round sequences falled to produce a clad rod with uniform jacket thickness. subsequent forming operations failed to rectify nonuniformities in jacket thicknesses once they had occurred. (auth

The determination of parathion and possible metabolites in the milk, blood and urine of dairy cows after experimental feeding of parathion

Call number: LD2668 .T4 1951 P3Master of Scienc

Irradiation effects on the mechanical properties of zirconium and dilute zirconium alloys: a review

The effects of fast flux (E greater than or equal to 1 MeV) neutrons on zirconium and dilute zirconium alloys are discussed. The effects on the elastic constants, strength and ductility, creep, fatigue and fracture, and irradiation growth are reviewed. (FS