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La Hulpe, Belgium

Ghorbaniasl G.,Vrije Universiteit Brussel | Hirsch C.,International | Siozos-Rousoulis L.,Vrije Universiteit Brussel | Lacor C.,Vrije Universiteit Brussel
International Journal of Aeroacoustics | Year: 2015

This paper deals with the derivation of an analytical time-domain formulation for the prediction of the acoustic velocity field generated by moving bodies in a medium at rest, according to the Kirchhoff method. The present formulation can be implemented in acoustic pressure codes based on the Farassat's Kirchhoff formula for arbitrary moving bodies, thus allowing direct and fast calculation of the acoustic velocity field in scattering problems. For validation purposes, four test cases are considered, namely a three-dimensional monopole, dipole and quadrupole source, as well as a monopole in uniform flow. Comparison of the results with the analytical solutions proves the remarkable accuracy of the present formulation. Source

Soltiz M.,Rochester Institute of Technology | Kudithipudi D.,Rochester Institute of Technology | Merkel C.,Rochester Institute of Technology | Rose G.S.,Air Force Research Lab | Pino R.E.,International
IEEE Transactions on Computers | Year: 2013

Neural logic blocks (NLBs) enable the realization of biologically inspired reconfigurable hardware. Networks of NLBs can be trained to perform complex computations such as multilevel Boolean logic and optical character recognition (OCR) in an area- and energy-efficient manner. Recently, several groups have proposed perceptron-based NLB designs with thin-film memristor synapses. These designs are implemented using a static threshold activation function, limiting the set of learnable functions to be linearly separable. In this work, we propose two NLB designs-robust adaptive NLB (RANLB) and multithreshold NLB (MTNLB) which overcome this limitation by allowing the effective activation function to be adapted during the training process. Consequently, both designs enable any logic function to be implemented in a single-layer NLB network. The proposed NLBs are designed, simulated, and trained to implement ISCAS-85 benchmark circuits, as well as OCR. The MTNLB achieves 90 percent improvement in the energy delay product (EDP) over lookup table (LUT)-based implementations of the ISCAS-85 benchmarks and up to a 99 percent improvement over a previous NLB implementation. As a compromise, the RANLB provides a smaller EDP improvement, but has an average training time of only 4 cycles for 4-input logic functions, compared to the MTNLBs 8-cycle average training time. © 1968-2012 IEEE. Source

Spencer G.,International
WIT Transactions on Ecology and the Environment | Year: 2010

By 2050 the world's population will increase by an estimated 50%. Most of the increased food demands will have to come from productivity improvements in existing irrigated agricultural areas. These improvements will need to be achieved with less water and less farm land because of the competition from urbanization, industrialization, the need to provide water for environmental purposes and to respond to climate change impacts. Therefore, the challenge facing us is to make existing irrigation systems more efficient and productive to better utilize the shrinking agricultural land and water resources. In south-eastern Australia, severe water shortages brought about by a prolonged 11 year drought sequence has spurred a lot of innovative thinking about how to use the limited available water more efficiently in irrigation and, at the same time, improving the performance of irrigation systems. A higher level of technological investment in the modernization of large unlined, gravity fed irrigation systems in the south-eastern state of Victoria has resulted in increases in efficiency from about 70% up to about 90% - a remarkable outcome. In Victoria, the water saved is being reallocated equally between urban and industrial users, the environment and to existing farmers to improve their security of supply. The investment required is a mix of both hardware and software involving remotely controlled gates, accurate water measuring devices, Supervisory Control and Data Acquisition (SCADA) and system management software. This investment, combined with modelling and control technologies, has resulted in the delivery of significantly improved services to irrigators in terms of equity, reliability and flexibility, and huge improvements in the management capability and performance of existing large-scale irrigation systems. © 2010 WIT Press. Source

Agency: Department of Commerce | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 49.50K | Year: 1995

The development of a computer database software in Microsoft (MS) Windows is proposed. The proposed software product which is to emulate the reference section of Huber and Herzberg's book, Spectroscopy of Diatomic Molecules, will contain complete and updated spectroscopic data on diatomic molecules. One design goal will be to create a graphical user interface (GUI) which is user-friendly, flexible and functional. All molecular states are displayed in its symbolic form, exactly as it appears in printed literature. The search and data display screens will be designed to be flexible and efficient. Included in phase I development is a module that plots the potential energy diagram (both Morse and RKR potentials) of the electronic state for those molecules with sufficient data. The end-product of Phase I development will be a working version (version 1.0) of the database software.

International | Date: 2016-02-03

Eyewear, namely, sunglasses, eyeglasses and ophthalmic frames and cases therefor.

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