Theoretical and experimental research on parameter tracking systems Final report, 15 Jul. 1964 - Aug. 1965

Parameter tracking systems based on equation error approach for mathematical model of unknown plan

Electricity consumption forecasting using Adaptive Neuro-Fuzzy Inference System (ANFIS)

Universiti Tun Hussein Onn Malaysia (UTHM) is a developing Malaysian Technical University. There is a great development of UTHM since its formation in 1993. Therefore, it is crucial to have accurate future electricity consumption forecasting for its future energy management and saving. Even though there are previous works of electricity consumption forecasting using Adaptive Neuro-Fuzzy Inference System (ANFIS), but most of their data are multivariate data. In this study, we have only univariate data of UTHM electricity consumption from January 2009 to December 2018 and wish to forecast 2019 consumption. The univariate data was converted to multivariate and ANFIS was chosen as it carries both advantages of Artificial Neural Network (ANN) and Fuzzy Inference System (FIS). ANFIS yields the MAPE between actual and predicted electricity consumption of 0.4002% which is relatively low if compared to previous works of UTHM electricity forecasting using time series model (11.14%), and first-order fuzzy time series (5.74%), and multiple linear regression (10.62%)

Electric field emissions of FPGA chip based on gigahertz transverse electromagnetic cell modeling and measurements

Modern integrated circuits (ICs) are significant sources of undesired electromagnetic wave. Therefore, characterization of chip-level emission is essential to comply with EMC tests at the product level. A Gigahertz Transverse Electromagnetic (GTEM) cell is a common test instrument used to measure IC radiated emission and the test cost is relatively low. Regular IC radiated emission measurements using GTEM tend to neglect some significant emission sources. Thus, this research proposed an alternative methodology to perform field measurement of the IC inside the GTEM cell in order to optimize the field measurements. This research study also attempted analysis of the overall GTEM cell performance using transmission line theory. An FPGA chip was adopted as the IC under test because of its flexibility in configuration to any digital circuit. The investigations discovered that the impact of the FPGA board supporting components and interconnection cables can be significantly reduced with appropriate shielding and grounding. The electric field predict a far distance from the FPGA chip was carried out based on the dipole moment technique. In particular, the dipole moment model emphasizing the tiny horizontal and vertical radiation elements inside the FPGA chip as Hertzian antenna and small current loop. Equations to predict the horizontal and vertical electric field were developed based on Hertzian antenna and small current loop which relate the tiny radiation sources to electric and magnetic dipole moments. The prediction was validated with 3-meter field measurements in a semi-anechoic chamber. On top of that, a spiral-like pattern was developed to obtain a correction factor for further improvement of the correlation between prediction and SAC measurement. The results revealed that the correction factor effectively reduced the gap between the prediction and measurement fields and boosted the correlation coefficient by 44%. The difference of peak values also has limited to less than 0dB after correction. These results suggest a promising finding for a future EMI test of ICs with a cheaper GTEM cell

Nasa to launch second pegasus meteoroid satellite

Second Pegasus meteoroid satellite launching by NAS

Mineral composition through soil-wine system of portuguese vineyards and its potential for wine traceability

The control of geographic origin is one of a highest priority issue regarding traceability and wine authenticity. The current study aimed to examine whether elemental composition can be used for the discrimination of wines according to geographical origin, taking into account the effects of soil, winemaking process, and year of production. The elemental composition of soils, grapes, musts, and wines from three DO (Designations of Origin) and for two vintage years was determined by using the ICP-MS semi-quantitative method, followed by multivariate statistical analysis. The elemental composition of soils varied according to geological formations, and for some elements, the variation due to soil provenance was also observed in musts and wines. Li, Mn, Sr and rare-earth elements (REE) allowed wine discrimination according to vineyard. Results evidenced the influence of winemaking processes and of vintage year on the wine’s elemental composition. The mineral composition pattern is transferred through the soil-wine system, and differences observed for soils are reflected in grape musts and wines, but not for all elements. Results suggest that winemaking processes and vintage year should be taken into account for the use of elemental composition as a tool for wine traceability. Therefore, understanding the evolution of mineral pattern composition from soil to wine, and how it is influenced by the climatic year, is indispensable for traceability purposesinfo:eu-repo/semantics/publishedVersio

The effect of connection flexibility on the seismic performance of industrial racking systems

University of Technology Sydney. Faculty of Engineering and Information Technology.Industrial racking systems are load bearing structures for the warehouse storage of goods. They are normally fabricated and assembled from cold-formed perforated open thin-walled vertical members and can be 4 meters to 40 meters high. To resist lateral actions such as seismic loads, racking structures rely typically on flexible boltless beam to upright connections along the storage aisles and braced frames in the transverse cross-aisle direction. Compared to their self weight, industrial racks carry very heavy pallet loads as opposed to other conventional structures. High slenderness ratio, heavy pallet loads, connection flexibility and low degree of redundancy make rack structures very different from conventional steel structures. Therefore, in the racking industry special analysis and design codes are adopted which require specific experimental tests to determine the performance of the key structural components. However the current standards do not give sufficient guidance for seismic design. This PhD research investigates both numerically and experimentally the effect of different connections on the performance of industrial racking systems. The research focus is on three critical connections: (a) Beam-upright connection; (b) Floor connection (Base-plate connection); and (c) Bolted brace connection. Courtesy of Dexion Australia, part of the research was based on test results conducted on their racking components. More than 70 beam to upright connection tests including monotonic and cyclic tests, 15 base plate tests under combined axial and bending loads and 4 full cross aisle shear frame tests were studied. FE models were then developed and verified against the test results. Further FE analyses revealed the behaviour of the aforementioned local connections under monotonic and cyclic actions and as a result simple theoretical models were proposed. After deep investigations on the performance of different connections of a typical rack structure, more than 20 full scaled shake table tests were conducted to reveal the dynamic features of a rack structure and one full scaled static cyclic push over test was performed to evaluate the system deterioration under cyclic actions. Both dynamic and static full scaled tests were accurately modeled using the proposed beam to upright connection model. A new performance based seismic analysis approach was proposed at the end of the thesis which showed much more accurate results compared to the seismic analysis approach in the current racking codes and specifications

Introduction - Professor Jim Rhodes, Founding Editor

This special edition of the Journal comprises the collection of papers presented at a conference held at the University of Strathclyde, Glasgow, to celebrate the work of Professor Jim Rhodes. The conference theme, Thin Walled Structures, encapsulates the technical field in which Professor Rhodes has been at the forefront for over 40 years. Indeed, it is appropriate that the conference bore the same name as the present Journal, which Professor Rhodes founded in 1983. The special event, held over 2 days, focussed on five specific technical themes, which Professor Rhodes has contributed to over the years, namely Cold Formed Steel (6 papers)-Chaired by Dr. Martin MacDonald, Glasgow Caledonian University; Buckling and Thin Walled Systems (7 papers)-Chaired by Professor Joe Loughlan, Loughborough University; Impact and Dynamical Systems (5 papers)-Chaired by Dr. Marcus Wheel, University of Strathclyde; Composites (5 papers)-Chaired by Professor William M. Banks, University of Strathclyde; Plates and Shells (9 papers)-Chaired by Dr. David Nash, University of Strathclyde