Design, development and application of an intelligent token

Modern transaction processing systems call for a trustworthy means of user identity verification. Tokens and systems widely used at present have security weaknesses and other limitations. A token is described here that offers secure user identity verification even when the access terminal is not itself secure. The token also assures the integrity of transactions entered into by the token holder. The design philosophy is outlined, and an account of some of the possible applications for the device is given.     

Scope methodology for safety

The EXTENDED Assessment/Certification task of the ESPRIT project SCOPE is intended to address those issues of Software Assessment/Certification which are not directly covered by its BASIC Assessment/Certification Model. That is it aims to cover some aspects of ‘Fitness of Purpose’ of software products, but, being mindful of the advice emanating from the Legal Study, will not claim to cover all aspects. This may readily be appreciated too, by appreciating the plethora of techniques which are already available to, say, the safety community. The aim is to assess the impact of these techniques upon the SCOPE BASIC model, and to recomment adjustments if necessary.We intend to introduce some of those problems and techniques which may be of relevance to the extended certification task of SCOPE, though it should be borne in mind that the project ultimately has to demonstrate the feasibility of its approach to certification, and that it is not its purpose to develop new tools but rather to investigate, adapt and integrate existing tools to demonstrate the viability of the proposed approach. In the Appendix we introduce a new relativistic software reliability model.This paper is not intended to be complete, it is meant to provoke discussion and reports on progress so far.     

Delta-doping of semiconductors

The structural, electrical and optical properties of epitaxial semiconductor layers, delta-doped with impurity atoms, are reviewed. The majority of the discussion relates to GaAs, the most-studied material, but where possible, results for Si and other semiconductors will be presented. Although the ideal situation is one of dopant atoms confined to a single atomic plane, there are several factors, such as diffusion and segregation, which broaden the profiles, and techniques to minimize these effects are discussed. The electrostatic attraction between free carriers and ionized dopants results in a V-shaped potential well, perpendicular to the dopant plane, which confines the carriers into a quasi-two-dimensional sheet, and quantizes their energy into a series of sub-bands. This has significant consequences for the electrical and optical properties of the layers, and results of such measurements on these structures are presented. Several features of delta-doped layers are attractive for exploitation in devices, and this is illustrated by reference to a number of novel or improved device designs.     

Assessment of the nutritional value of novel proteins

Methods of determining the nutritive value of novel proteins or derived food products such as proteins from fish, algae, leaf or microbiological sources, are reviewed. The use of physical (solubility) or chemical (amino acid analysis) methods, feeding tests in rats and other animals for the determination of biological value, digestibility and protein efficiency ratios, rate of enzymatic hydrolysis or retention of enzymatic activity are among the procedures surveyed. The safety of new food sources must always be a first consideration. Presented at AOCS-AAOC Short Course on Oilseed Proteins: Chemistry, Technology and Economics, French Lick, Indiana, July 1969.     

Electrochemical machining of refractory materials

The feasibility of the electrochemical machining (ECM) of pure TiC, ZrC, TiB₂ and ZrB₂ has been established. In addition, the ECM behaviour of a cemented TiC/10% Ni composite has been investigated and compared to that of its components, TiC and nickel. ECM was carried out in 2M KNO₃ and in 3 M NaCl at applied voltages of 10–31 V and current densities of 15–115 A cm^–2. Post-ECM surface studies on the TiC/Ni composite showed preferential dissolution of the TiC phase during machining.Nomenclature E ₀ thermodynamic equilibrium potential (V) - F Faraday's constant (96 500 Coul mol^–1) - toolpiece feed rate (cm s^–1 or mm min^–1) - I current (A) - i current density (A cm^–2) - k electrolyte conductivity (^–1 cm^–1) - l interelectrode gap (mm) - mass removal rate (g s^–1 or g min^–1) - M formula weight (g mol^–1) - Q electrolyte flow rate (l min^–1) - t electrolyte temperature (°C) - V applied voltage (V) - V _IR ohmic drop through electrolyte (V) - z apparent valence of dissolution (eq mol^–1) - _i overvoltages (V) - density of refractory materials (g cm^–3)     

Nitrogen quench of experimental blast furnace

Preliminary results of chemical and petrographic analyses of samples from US Bureau of Mines experimental blast furnace quenched by blowing it out with nitrogen.     

Psychological differentiation and psychotherapy

Patient's level of psychological differentiation was studied in relation to patients' and therapists' evaluations of the initial psychotherapy session. The evaluations assessed two broad dimensions of the interaction which generally have been considered important for psychotherapeutic success and which have been found to be related to patients' psychological differentiation: namely, patients' and therapists' satisfaction with the amount of structure, and therapists' impressions of patients' appropriateness for therapy. Significant correlations were obtained between patients' psychological differentiation and both of these dimensions. However, two control variables, socioeconomic status and alcohol use, were also found to be related to these dimensions. When the effects of these variables were partialed out, the relationships with therapists' impressions of appropriateness disappeared, but the relationships with patients' and therapists' satisfaction with the amount of structure remained significant. The relationship of these findings to other studies of psychological differentiation and psychotherapy is discussed. Finally, the contribution of the present results to the choice of the most appropriate measure of psychological differentiation is noted.     

A symposium on psychologists in schools of medicine in 1977.

Introduces a series of 4 articles reporting the results of a survey of organizational structure, career status, and satisfaction of psychologists in medical schools, the range and pattern of graduate programs offered, and a general overview. (5 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ethynyl terminated bisquinazolone

Summary The reaction of -2(-4 ethynylphenyl)-4H-1,3 benzoxazin-4 one with bis-2,6(3-aminophenoxy pyridine leads to a soluble ethynylated bisquinazolone. The latter starts to polymerize at 150°C to yield a network which exhibits a Tg at 290°C. This network is stable in air up to 405°C.