Showing papers on "Domain (software engineering) published in 1968"

Domain propagation arrangement

Abstract: Interactions between single wall domains permit logic operations to be realized in magnetic sheets in which such domains are moved. Magnetically soft overlay patterns not only define propagation channels for such domains in response to magnetic fields reorienting in the plane of the sheet but also define channel intersections where logic functions are carried out. Domains are idled or, alternatively, in direction at those intersections depending on the positions of preceding domains. A variety of counter circuits are described.

Simplified model for the domain dynamics in Gunn-effect semiconductors covered with dielectric sheets

Abstract: A simplified model is proposed which describes the effect of the stray fields in dielectric surface layers on the dynamical behaviour of domains in thin Gunn-effect semiconductors. The stray fields cause an increase in domain capacitance and hence a decrease in build-up time which leads to larger n0L products for stable operation.

Domain propagation arrangement

Abstract: An arrangement for moving single-wall domains is described which employs an in-plane magnetic field to incline a domain from alignment with an axis of preferred magnetization of the material in which it is moved. As the in-plane field reorients, the orientation of the inclination changes. The changing domain inclination is converted to domain translation along an axis defined by a magnetic overlay in which a permanent magnetic pattern is printed.

Aesthetic Education as a Domain

Abstract: As this Journal illustrates, Aesthetic Education may be discussed in many ways. In this essay, I would like to discuss it as a domain, and to ask specifically what is required to interpret it properly as a domain. "Domain" means any area of human activity having an established and distinctive purpose structure.1 Physics, transportation, journalism, law, pathology are among countless illustrations of domains. Each includes many human activities along fairly well-established lines, and each has a purpose and a different purpose. Law is not physics, nor does it aim to be physics; similarly, transportation and journalism and the others, despite connections and some common attributes. Domains often exist inside domains or as subdomains. A culture may be defined as a system of domains with their subdomains included. In discussing Aesthetic Education as a domain, I shall understand it as a subdomain of education and as an integral part of culture. What then are the requisites for properly interpreting this segment of human activity in the domain manner?

Two-dimensional Gunn-domain dynamics

Abstract: In two-dimensional bulk GaAs devices, each small segment of a high-field domain can be considered to move normal to its front, with a velocity equal to that of a one-dimensional domain having the same domain potential. Using this simple model, an equation describing the domain shape in two-dimensional samples was obtained. When edge nucleation effects are taken into account, the solution of the equation provides a good explanation for most of the domain motions observed experimentally in various samples of non-uniform shape. The experimental observations were made using a resistive probe. The probe experiments enable one to visualize how domains behave in devices with sudden or gradual changes in width, with sharp or gradual bends, and with multiple terminals. In an Appendix, the simple model of two-dimensional domains is justified using a perturbation theory.

Some open questions on minimal primes of a Krull domain

Abstract: Let A be an integral domain and K its quotient field. A is called a Krull domain if there is a set { Va) of rank one discrete valuation rings such that A = DaVa and such that each non-zero element of A is a non-unit in only finitely many of the Va. The structure of these rings was first investigated by Krull, who called them endliche discrete Hauptordungen (4 or 5, p. 104). Samuel (7), Bourbaki (1), and Nagata (6) gave an excellent survey of the subject. In terms of the semigroup D(A) of divisors of A, A is a Krull domain if and only if D{A) is an ordered group of the form Z (1, p. 8). In fact, if A is a Krull domain, then the minimal positive elements of D(A) generate D(A) and are in one-to-one correspondence with the minimal prime ideals of A. Moreover, as Bourbaki observed in (1, p. 83), each divisor of A has the form div(Ax + Ay) for some elements x and y of K. In particular, if P is a minimal prime of A, then div(P) = àxv(Ax + Ay); hence P = A : (A : (x,y)). The extent to which the minimal primes of a Krull domain are related to finitely generated ideals has not been completely resolved. This question appeared to be partially answered by Bourbaki in (1, p. 83) when he indicated a method for constructing a two-dimensional Krull ring with a non-finitely generated minimal prime. Our purpose is to show that a domain constructed in the manner suggested by Bourbaki must be noetherian and thus cannot provide the desired example. We make use of the following result of (3) : Let R be a commutative ring with identity and let S be an over ring of R which is a finite unitary R-module. Then if S is noetherian, R is noetherian. Let Z denote the integers and Q the rationals. Define inductively a sequence of algebraic number fields {K^^i such that: (i) Q = Ko, (ii) Ki+i = Ki(yi), where yt is a root of Y 2 — 5at £ Kt[Y], (iii) the integral closure of Z in VJKt is Dedekind. Let A = Z[[X]] and K its quotient field. Set zt= (a tX)K Bourbaki contends that the integral closure of A in i£({s4?=i) is a Krull domain and that the minimal prime generated by X and the zt is not finitely generated. 1 We remark that if the integral closure of Z in L = Q{{ (5a^}°°=1) is

The Bodily Self and Psychological Space

Abstract: This essay is an approach to fundamental issues in the analysis of psychological space. This space is, on the one hand, something “phenomenal,” and on the other, a medium for our voluntary action. Thus the topic is not restricted to the domain of perception-psychology, but is basic for behavior-psychology.