Showing papers by "University of Wollongong published in 1971"
TL;DR: The goodness of fit test as discussed by the authors takes account of deviations from randomness, irrespective of their direction, over the whole distribution of nearest neighbor distances while the Clark & Evans and the Thompson tests are sensitive to deviations either in the direction of aggregation or the directions of regularity.
64 citations
01 Sep 1971
TL;DR: In this article, the applicability of the phenomenological crystallographic theory to martensitic transformations in ferrous alloys is discussed, and it is concluded that only for the {3, 15, 10}====== and {252}====== F====== transformations are experimental data sufficiently complete for detailed comparisons with predictions of the theory.
Abstract: The applicability of the phenomenological crystallographic theory to martensitic transformations in ferrous alloys is discussed, and it is concluded that only for the {3, 15, 10}
F
and {252}
F
transformations are experimental data sufficiently complete for detailed comparisons with predictions of the theory. Since crystallographic measurements have proved more difficult to obtain in the {252}F case a detailed assessment of electron microscopy observations and of reported measurements of the shape strain and orientation relationship is given for this transformation. The basic theory introduced, in the 1950's accounts satisfactorily for the {3, 15, 10}
F
transformation but not for the {252}
F
, case. Recent modifications of the theory based on multiple lattice invariant shears are also reviewed and are examined in the light of the crystallographic measurements. The use of experimental information to infer possible inhomogeneous deformation modes is emphasized.
46 citations
01 Aug 1971-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
24 citations
TL;DR: The smallest order for which a skew-Hadamard matrix was not known was 92 as discussed by the authors, which was the first known order for a Hadamard matrices of order 2.
Abstract: There is a skew-Hadamard matrix of order 92.Previously the smallest order for which a skew-Hadamard matrix was not known was 92. We construct such a matrix below. The orders < 200 which are now undecided are 100, 116, 148, 156, 172, 188, 196; see [2], [3]. The existence of any Hadamard matrix of order 92 was unknown until 1962 [1].
16 citations
TL;DR: Two tests of classificatory ability based on Piaget's theory of cognitive development, and the Peabody Picture Vocabulary Test (PPVT), were administered to 40 full-blood urban Aboriginal children in the Northern Territory of Australia as discussed by the authors.
Abstract: Two tests of classificatory ability based on Piaget's theory of cognitive development, and the Peabody Picture Vocabulary Test (PPVT), were administered to 40 full-blood urban Aboriginal children in the Northern Territory of Australia. The PPVT was also given to 80 white urban children of similar low-socioeconomic status. A trend in an earlier study for high-contact Aboriginals to perform on classification tests at about the same level as white children in a similar environment was confirmed, despite the markedly lower verbal IQ scores of Aboriginal children.
15 citations
TL;DR: In this paper, the optimum content of the reactive macerals (vitrinite and exinite) in a coal or coal blend was found to be in excess of 70%.
8 citations
TL;DR: It is suggested that phases of the menstrual cycle should be taken into account when females are recruited for studies of learning and perception through the skin.
Abstract: 3 groups of nulliparous -women aged from 17 to 22 yr. learned a 9-element vibroractile code through the skin of the left wrist. The groups were designated premenstrual, postmenstrual, and intermenstrual. There was a significant practice effect over 10 trials and a significant difference between menstrual groups. It is suggested that phases of the menstrual cycle should be taken into account when females are recruited for studies of learning and perception through the skin.
7 citations
TL;DR: It is considered that there is already sufficient evidence to justify the use of cyclandelate in those cases of cerebrovascular disease which are not suited for surgical or anticoagulant treatment.
Abstract: Cyclandelate, a drug said to be effective in improving cerebral blood flow, has been given to 11 patients with proven cerebrovascular disease. Assessment of these patients over a three‐month period has shown a significant improvement in their condition, and while further controlled assessment is desirable, it is considered that there is already sufficient evidence to justify the use of cyclandelate in those cases of cerebrovascular disease which are not suited for surgical or anticoagulant treatment.
4 citations
TL;DR: In this paper, a signal detection procedure was used to obtain data from nine groups of Ss in a vibrotactile learning experiment and each group was required to learn, as the signal, one of the nine elements available in a code based on three durations and three intensities of signal.
Abstract: A signal detection procedure was used to obtain data from nine groups of Ss in a vibrotactile learning experiment. Each group was required to learn, as the “signal”, one of the nine elements available in a code based on three durations and three intensities of signal. It was postulated that a simple model would account for the frequencies and distributions of most false alarms (FA's). The model states that there is a psychological similarity space (PSS) in which equal distances correspond to equal differences in duration and intensity and the probability of confusing another stimulus with the signal is a decreasing function of distance from the signal. Of the resultant FA's 76.60% were errors of adjacency, i.e. most signals were confused with adjacent stimulus elements. When the same FA's were categorized in terms of intensity and duration there were 111 intensity, 130 duration, and 50 combined intensity-duration errors.
3 citations
TL;DR: In this paper, measures of shape distortion in urban geography are discussed. But they do not consider the relationship between shape distortion and shape distortions in urban areas, and do not address the problem of urban sparsification.
Abstract: (1971). Measures of shape distortion in Urban geography. Australian Geographer: Vol. 11, No. 6, pp. 593-595.
1 citations
TL;DR: Wallis as discussed by the authors considered integer matrices obeying generalized incidence equations and showed that given certain other constraints, a constant multiple of the incidence matrix of a (v, k, lambda)-configuration may be identified as the solution of the equation.
Abstract: We consider integer matrices obeying certain generalizations of the incidence equations for (v, k, lambda)configurations and show that given certain other constraints, a constant multiple of the incidence matrix of a (v, k, lambda)-configuration may be identified as the solution of the equation. Disciplines Physical Sciences and Mathematics Publication Details Jennifer Seberry Wallis, Integer matrices obeying generalized incidence equations, Bulletin of the Australian Mathematical Society, 4, (1971), 51-56. This journal article is available at Research Online: http://ro.uow.edu.au/infopapers/937 BULL. AUSTRAL. MATH. SOC. MOS 05B20, 15A36 VOL. 4 (1971), 51-56. Integer matrices obeying generalized incidence equations Jennifer Wallis (15A24) We consider integer matrices obeying certain generalizations of the incidence equations for (v, k, A)-configurations and show that given certain other constraints, a constant multiple of the incidence matrix of a (v, k, A)-configuration may be identified as the solution of the equation. We define (v, k, A)-configurations as usual (see [3J). If E is the (0, 1) incidence matrix of a (v, k, A)-configuration and if A bE where b is a positive integer, 'then { AAT = b2(k_A)I + b2AJ AJ = bkJ A(v-l) k(k-l) , with J as usual the matrix with every element + 1 , and I the identity matrix. Ryser [2J proved a partial converse: LEMMA 1. If A is a v x V integer matrix satisfying equations (1) with b = 1 > then A is the incidence matrix of a (v, k, A)-configuration (and consequently has every entry 0 or 1). One might conjecture, in view of the powerful theorems of Ryser [2J and Bridges and Ryser [1J, that an integer matrix satisfying (1) would necessarily be b times the incidence matrix of a (v, k, AI-configuration. But the matrix Received 24 August 1970. 51 52 J enn i fer Wa I lis 0 3 0 0 1 1 1 -1 0 2 1 2 1 1 2 0 0 0 2 2 0 A 2 1 2 0 1 -1 1 1 0 0 1 0 1 3 1 1 0 3 1 0 0 1 1 2 1 -1 2 0 satisfies (1) with b = 2 , v = 7 k 3 and A = 1 So we need other conditions on the matrix A before we can ensure that every element is 0 or b We shall prove: THEOREM 2. If A is a v x v matrix of non-negative integers which satisfies (1), and if every entry of A is less than or equal to b , then A is b times the incidence matrix of a (v, k, A)-configuration. The corresponding result for non-positive A and negative b also holds. By similar methods we shall obtain a result about more general equations: THEOREM 3. Let B be an integer matrix of order v which satisfiei BBT (p-q)I + qJ BJ dJ where p, q and d are constants and d > o. Write wand z for the greatest and least elements of B respectively, and w = Iwl . If then 0 is an integer, LEMMA 4. Let B v integers such that L j=l z :59:.= 0 and z E. E. b .. for 1.-J d every non-zero biJ ' then every entry of B is 0 or d' v v Proof. L b~ . P and L b .. d , so J=l 1.-J J=l 1.-J d L 2 L b .. dp dp b .. P 0 J 1.-J J 1.-J that is Lb . . (db .. -p) = 0 • J 1.-J 1.-J From the data every term in this summation has the same sign, so every term is zero. So b . . = 0 1.-J or E. d COROLLARY 5. If there is a matrix B satisfying the conditions of Lemma 4, then dip Corresponding results may be obtained for matrices of non-positive integers. Proof of Theorem 2. The matrix A satisfies the conditions of Lemma 4 with P bLk and d bk So every entry is 0 or b (b = J) Consider B = b-lA B is an integer matrix satisfying Lemma 1, so it is the incidence matrix of a (v, k, A)-configuration, and we have the result. 2. Proof of Theorem 3 Proof of Theorem 3. Clearly p = L b~. implies p ~ 0 i 1.-J implies p > O. Consider the class of matrices C B + ad a and d > 0 where a is an integer and a ~ w this class is non-negative and Every element of every member of