Groundwater management programs frequently require data on the response of the aquifer to its various inputs and outputs. A numerical model has been developed to assist in the assessment of recharge quantities. The model is designed to be capable of representing the processes of rainfall and river recharge, irrigation extraction and leakage to the sea.-from Authors
The geometric optics condition for zero crosspolarisation in offset Cassegrain antennas is discussed. It is shown that with a feed having perfect pattern symmetry the crosspolar performance of the offset Cassegrain is limited by diffraction. As a result minimum crosspolarisation is only achieved at the geometric optics condition when the subreflector diameter is at least 40 wavelengths. © 1981, The Institution of Electrical Engineers. All rights reserved.
Hadgraft, RG, Volker, RE & Stark, KP 1981, 'unknown', IN: PROC. 19TH IAHR CONGRESS, (NEW DELHI, INDIA: FEB. 1-7, 1981), vol. 4, New Delhi, India, IAHR, 1981, Subject-C(b), Paper 11.
Dynamic programming and simulation have been used to study a water resource system involving a major surface storage and an aquifer located downstream. The aquifer provides approximately 250,000 ML of irrigation water annually and natural recharge is augmented by artificial recharge using river water. Results are presented from various operating rules to determine the optimal strategy of releases from the surface storage. The operating rules depend on factors such as reservoir level, expected inflows and water demands. (A)
A number of upper and lower bounds have been described in the literature for the error performance of digital communication channels for the case of white output noise.1,2 In this letter a lower bound on the probability of error for one shot communication over a general linear channel with coloured noise is derived. © 1981, The Institution of Electrical Engineers. All rights reserved.
Kumar, A & Waldron, KJ 1981, 'The workspaces of a mechanical manipulator', Journal of Mechanical Design, Transactions of the ASME, vol. 103, no. 3, pp. 665-672.
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A new theory and a resulting algorithm for tracing the bounding surfaces of mechanical manipulator workspaces is presented. The natures of the numerous singular configurations and means of accommodating them within the algorithm are also studied. In order to sort surfaces of interest from the large number of possible solutions, a numerically implementable labelling technique is also presented. The algorithm is applicable to all practicable manipulator configurations with three, or more, degrees of freedom. © 1981 by ASME.
MISTREE, F, HUGHES, OF & PHUOC, HB 1981, 'AN OPTIMIZATION METHOD FOR THE DESIGN OF LARGE, HIGHLY CONSTRAINED COMPLEX-SYSTEMS', ENGINEERING OPTIMIZATION, vol. 5, no. 3, pp. 179-197.
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VOINOV, AA & SVIREZHEV, YM 1981, 'STABILITY OF A SIMPLE FRESH-WATER ECOSYSTEM MODEL', ZHURNAL OBSHCHEI BIOLOGII, vol. 42, no. 6, pp. 936-940.
Bakoss, SL, Faulkes, KA & Pulmano, VA 1981, 'DETERMINATION OF CREEP AND SHRINKAGE CHARACTERISTICS FOR THE PREDICTION OF THE LONG-TERM DEFORMATIONS OF REINFORCED CONCRETE BEAMS.', National Conference Publication - Institution of Engineers, Australia, pp. 31-36.
Bird, TS 1981, 'CROSS-POLARIZATION IN DUAL-OFFSET REFLECTOR ANTENNAS.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 211-213.
Bird, TS & Allen, GH 1981, 'MICROWAVE ANTENNA RADIATION PATTERN MEASUREMENT BY PLANAR NEAR FIELD TECHNIQUES.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 47-49.
Hadgraft, RG, Volker, RE & Stark, KP 1981, 'OPTIMAL CONJUNCTIVE OPERATION OF A SURFACE RESERVOIR AND AN AQUIFER.', Proceedings, Congress - International Association For Hydraulic Research, pp. 183-191.
Song, SM & Waldron, KJ 1981, 'THEORETICAL AND NUMERICAL IMPROVEMENTS TO AN INTERACTIVE LINKAGE DESIGN PROGRAM - RECSYN.', Proceedings - OSU Applied Mechanisms Conference (Oklahoma State University).
Phuoc, HB & Tanner, RI United Kingdom Atomic Energy Authority 1981, Finite Element Program Results, Numerical Solutions for A Comparison Problem on Natural Convection in an Enclosed Cavity, (ed. L.P. Jones and C.P. Thompson), AERE-R 9955, United Kingdom Atomic Energy Authority, Harwell, England, pp. 110-112, January 1981., no. AERE - R 9955, pp. 110-112, Harwell, Oxfordshire, England.
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