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Ahmad Mayyas Abdel Raouf Mayyas Ala Qattawi Qin Shen 《International Journal of Sustainable Engineering》2014,7(3):200-213
The aim of this study is to develop a material selection framework structured around a knowledge-based system (KBS). Specifically, a hybrid data mining technique is employed to extract knowledge from large datasets using cluster analysis techniques; the mined knowledge then serves as the inference logic within the KBS designed for material selection purposes. Cluster analysis results are used as a basis for the tree-based structure of the KBS where if–then rules are developed based on the general cluster properties; that is, inference logic is structured in a way such that it can predict general sustainability characteristics of the material as well as its exact mechanical, cost and physical properties. To develop the structure of the KBS, the selection structure employs sustainable material indices. Additionally, the proposed material selection model of the KBS is purposefully composed of material sustainability, functionality and cost indices. The constructed knowledge is then demonstrated for selecting automobile structural panels. 相似文献
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A 45,X/46,Xder(Y) mosaicism detected prenatally was shown to have a rare Y inversion- duplication or Y/Y translocation which can only be identified by a combination of high resolution cytogenetics and fluorescence in situ hybridization. The present data indicate the usefulness and importance of chromosome-specific probes in the identification and characterization of chromosome rearrangements. 相似文献
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The northern propellerclam Cyrtodaria siliqua is a common bycatch in the Arctic surfclam, Mactromeris polynyma fishery on Banquereau Bank in Eastern Canada. Samples of the propellerclam from this exploited fishery were used to determine
the life history characteristics of the population. The age structure of the population is dominated by old animals to ages
exceeding 100 years. We validated the age estimates for the propellerclam through analysis of bomb-produced radiocarbon in
the shell growth increments deposited before, during and after the atmospheric atomic bomb testing periods of the 1950s and
1960s. Radiocarbon from shells with presumed birth dates between the late 1950s and 1970s clearly reflected the sharp increase
in oceanic radiocarbon attributable to previous nuclear testing, indicating that age estimates based on shell increment counts
are accurate. Estimates of von Bertalanffy growth parameters revealed that the growth rate of the population was relatively
rapid for the first 20 years of life, slowing down to very low growth rates thereafter. Sexual maturity was estimated as being
reached at 28.6 mm in length and 4.7 years in age. Size–weight morphometric relationships were also calculated. 相似文献
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M. Khalis Raouf Hassan 《Local Environment》2013,18(1):59-72
Cities in the Kurdistan region in Iraq – particularly, the capital city of Hewlair (Erbil) – are facing environmental problems such as water, air and noise pollution. Political instability, ethnic tensions, politically motivated decisions, wars and economic sanctions, consumerism, lack of sufficient funds, and tension between the federal and regional governments due to power and wealth sharing are major contributors to the environmental problems; this paper will depict and analyse these. Although these problems are causing serious health issues for the inhabitants and sometimes death, the authorities are unable to solve them. The paper sheds light on the causes and effects of the environmental problems and also draws conclusions and makes suggestions. 相似文献
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