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排序方式: 共有74条查询结果,搜索用时 31 毫秒
1.
Kok Yew Ng Chee Pin Tan Rini Akmeliawati Christopher Edwards 《Asian journal of control》2010,12(5):656-660
This paper investigates and presents conditions that guarantee disturbance decoupled fault reconstruction using sliding mode observers, which are less stringent than those of previous work, and show that disturbance reconstruction is not necessary. An aircraft model validates the ideas proposed in this paper. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
2.
Raafat Safanah M. Akmeliawati Rini Martono Wahyudi 《International Journal of Control, Automation and Systems》2010,8(5):1123-1132
This paper addresses an intelligent uncertainty function to improve the robust stability and performance of H
∞ controlled system in terms of reduced conservatism. The system is identified, output performance and control signal requirements
are controlled by proper selection of performance and control weighting functions. Adaptive Neuro Fuzzy Inference System (ANFIS)
learns the uncertainty bounds of model uncertainty that results from unmodeled dynamics and parameter variations, then the
developed uncertainty weighting function will be included in the synthesis of the H
∞ controller. ν-gap measure is utilized to validate the intelligent identified uncertainty bounds and measure the stability of the designed
H
∞ controlled system as well. Experimental results on a servo motion system reveal the advantages of combining intelligent uncertainty
identification and robust control. Improved performance is achieved. The proposed approach also allows for iterative experiment
design. 相似文献
3.
Product Focused Software Process Improvement: Concepts and Experiences from Industry 总被引:1,自引:0,他引:1
Management problems in the development of software have been addressed over the last years by a strong focus on the improvement of the development processes. Software process improvement (SPI) activities are characterized by an internal focus on a software development department and its procedures. However, the quality of the product is hardly addressed in software process improvement programs. This paper presents the application of a model for product focused SPI (P-SPI) and describes experiences with this model in practice. The main conclusions are that P-SPI puts products to be developed in a central position in improvement programs, results in fulfilling specific quality goals of a company and project, and industrial experiments show interesting benefits. Applying the approach in industrial projects showed that P-SPI is relatively cheap and gives fast results and high benefits. 相似文献
4.
5.
G. Flint S. Lamont B. Lane H. Sarrazin L. Lim Darlene Rini C. Roben 《Fire Technology》2013,49(3):767-792
The knowledge in the field of structural fire engineering has been greatly advanced through assessment of a number of real fires (WTC, Torre Windsor, Broadgate, etc.) and, especially, by the Cardington series of full scale structural fire tests. This knowledge has been used to validate and verify the use of computational finite element models that have expanded the range of structures that can be investigated under severe fire exposure. This paper presents a selection of key lessons learned by the authors through the assessment of structures in fire for real commercial building projects. The key areas of sensitivity that have been encountered are described and a discussion of each point presented. The paper is aimed at describing potential weaknesses that have been observed in the commercial work of the authors, often driven by the requirements for efficient ambient structural design. The paper concludes with some suggested advice for structural engineers aimed at increasing the general robustness of building structures. This is based on designing out as far as possible in the ambient design of a structure the potential weaknesses identified in past project work. 相似文献
6.
E. G. Rini N. K. Gaur V. Shelke J. Galgale M. P. Verma R. K. Singh 《Journal of Superconductivity》2002,15(6):583-585
We have developed a shell model, which includes the long-range coulomb, van der Waals interaction, and the short-range Hafemeister–Flygare repulsive interaction operative up to second neighbor atom to study the cohesive and thermal properties of LaMnO3 + . The results on cohesive energy obtained by us are in good agreement with that of calculated value by DeSouza et. al. (R. A. DeSouza, M. S. Islam, and E. I. Tiffee, J. Mater. Chem.
9, 1621 (1999)). In addition, we have also calculated molecular force constant (f), compressibility (), restrahlen frequency (o), Debye temperature (D), and the low temperature specific heat at 50 K T 160 K. Our results on Debye temperature and specific heat for the temperature range 50 K T 160 K are closer to the recently measured data with an automated quasi-adiabatic pulse technique. 相似文献
7.
Summary It has been found that the method of moisture determination introduced by Parsons and Holmberg, in which water is evolved
from the sample and absorbed on CaCl2, is absolute and is applicable to all types of oils and fats, except those containing residual solvent. It is particularly
suited for the determination of very low percentages of moisture in oils and fats.
Of the methods recommended by the A.O.C.S. for the determination of moisture and volatile in oils and fats, the vacuum oven
was found to be the most accurate, except on high-fatty-acid coconut oil.
The hot-plate method gave the highest moisture results when the test was conducted according to the procedure outlined in
the methods of the A.O.C.S. When first traces of smoking were observed under a strong beam of concentrated light, resulting
moistures approached those obtained by the vacuum oven.
Moisture results obtained by the air oven, if corrected for peroxide absorption, approach those of the vacuum oven.
The percent of residual solvent in extracted soyabean oil, independent of moisture, may be accurately determined by adsorption
of solvent vapor on activated charcoal. 相似文献
8.
Guilhem Arrachart David J. Cassidy Inna Karatchevtseva Gerry Triani 《Journal of the American Ceramic Society》2009,92(9):2109-2115
Titanium ethoxide [Ti(OEt)4 ] was modified with aminobenzoic acid (AB) or aminosalicylic acid (AS) in order to control the hydrolysis and condensation rates, and to allow the preparation of organic–inorganic hybrid materials. A suite of complementary techniques, including Fourier transform infrared spectroscopy, NMR, SEM, thermogravimetric analysis, and X-ray diffraction, were used to elucidate the effects of incorporating an organic functional group into the precursor chemistry and its subsequent affect on the structure and morphology of the resultant hybrid material. The annealing behavior of the resulting hybrid titanium base materials was also investigated. Our studies show that both amino acid organic ligands, AB and AS, chemically bounded to the titanium complex, effect the precursor reactivity, specifically the hydrolysis and polycondensation reactions, which control the evolution and formation of the nanohybrid-based titania material. Following sol–gel processing, the nanohybrid materials are amorphous, due to the incorporation of the organic component. The phase transition (amorphous–anatase–rutile) observed during annealing from 25° to 800°C show subtle differences in the crystallization behavior, which are associated with the nature of the organic ligand. 相似文献
9.
Dana L. Morgan Gerry Triani Mark G. Blackford N. A. Raftery Ray L. Frost Eric R. Waclawik 《Journal of Materials Science》2011,46(2):548-557
In this study, the mechanism of precursor dissolution and the influence of kinetics of dissolution on titanate nanotube formation
were investigated. This comparative study explored the dissolution kinetics for the case of commercial titania powders, one
composed of predominantly anatase (>95%) and the other rutile phase (>93%). These nanoparticle precursors were hydrothermally
reacted in 9 mol L−1 NaOH at 160 °C over a range of reaction times of between 2 and 32 h. The high surface area nanotube-form product was confirmed
using X-ray diffraction, FT-Raman spectroscopy, and transmission electron microscopy. The concentration of nanotubes produced
from the different precursors was established using Rietveld analysis with internal and external corundum standardization
to calibrate the absolute concentrations of the samples. Interpretation of the dissolution process of the precursor materials
indicated that the dissolution of anatase proceeds via a zero-order kinetic process, whereas rutile dissolution is through
a second-order process. The TiO2 nanostructure formation process and mechanism of TiO2 precursor dissolution was confirmed by non-invasive dynamic light scattering measurements. Significant observations are that
nanotube formation occurred over a broad range of hydrothermal treatment conditions and was strongly influenced by the order
of precursor dissolution. 相似文献
10.
Nick C. Rini 《Information Systems Management》1990,7(1):73-75
Although most MIS departments use manual procedures to make changes to existing systems and applications, these procedures often cost the organization significant staff time and money. Although other MIS departments use their own automated methods for tracking these changes, these methods are no better because they are often not implemented throughout the organization's information systems, and, as a result, their effectiveness is limited. This column discusses the economic advantages of implementing an automated change control system. 相似文献