Development of a Robust Photogrammetric Metrology System for Monitoring the Healing of Bedsores     

Abbass  Malian  Ali  Azizi  Frank A.  van den Heuvel  Mahmoud  Zolfaghari 《The Photogrammetric Record》2005,20(111):241-273

  相似文献   

Optimum design of structures against earthquake by wavelet neural network and filter banks     

Eysa Salajegheh  Ali Heidari 《地震工程与结构动力学》2005,34(1):67-82

Optimum design of structures for earthquake is achieved by simulated annealing. To reduce the computational work, a fast wavelet transform is used by means of which the number of points in the earthquake record is decreased. The record is decomposed into two parts. One part contains the low frequency of the record, and the other contains the high frequency of the record. The low‐frequency content is the effective part, since most of the energy of the record is contained in this part of the record. Thus, the low‐frequency part of the record is used for dynamic analysis. Then, using a wavelet neural network, the dynamic responses of the structures are approximated. By such approximation, the dynamic analysis of the structure becomes unnecessary in the process of optimization. The wavelet neural networks have been employed as a general approximation tool for the time history dynamic analysis. A number of structures are designed for optimal weight and the results are compared to those corresponding to the exact dynamic analysis. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Halley and the London Queen Anne Churches     

Jason R Ali  Peter Cunich 《Astronomy& Geophysics》2005,46(2):2.22-2.25

Edmond Halley's work on two London churches makes them the first buildings planned using modern scientific techniques, argue Jason R Ali and Peter Cunich.  相似文献   

Determination of aquifer susceptibility to pollution using statistical analysis   总被引：1，自引：0，他引：1  

N. S. Abu-Jaber  A. S. El Aloosy  A. Jawad Ali 《Environmental Geology》1997,31(1-2):94-106

 The use of statistical techniques in studying the causes of geochemical variations in aquifers can provide important results which cannot be derived in other ways. In this study, data from the Wadi Shueib catchment area in Jordan is evaluated, using principle component factor and multivariate factor analysis in order to better understand the variablility in groundwater chemistry and evaluate the sources of pollution and the susceptibility of these aquifers to the different sources of pollution. This study clearly demonstrates that these statistical techniques can help determine the various mechanisms causing chemical variation in the aquifers and the relative susceptibility of each aquifer to different types of pollution. Received: 13 March 1996 · Accepted: 18 June 1996  相似文献   

Partial molar volume of water in phonolitic glasses and liquids     

Ali M. Bouhifd  Alan Whittington  Pascal Richet 《Contributions to Mineralogy and Petrology》2001,142(2):235-243

The volumes and expansivities of four hydrous phonolite glasses and liquids have been measured by dilatometry from 300 K up to the glass transition and over a 50 K interval just above the glass transition. The partial molar volume of water is independent of the water content for the glass and liquid phases, with values of about 11.0ǂ.5 and 17.1ǂ.9 cm³/mol at 300 and 800 K, respectively. The partial molar thermal expansivity of water in phonolite glasses is about 8᎒^-5 K^-1, a result similar to recently published values for different silicate compositions, and about 36.5᎒^-5 K^-1 in phonolite liquids. The implications for melt density and water dissolution are discussed.  相似文献   

Announcement     

Ali Shirvani-Mahdavi 《Journal of Atmospheric Chemistry》1990,10(1):97-97

  相似文献   

Magnetic measurements on the Norwegian continental margin between 68° and 70° N     

Gholam Ali Dehghani  Hans Bodo Hirschleber  Thomas Liebe  Arne Gidskehaug  Markvard A. Sellevoll 《Ocean Dynamics》1988,41(3-6):257-264

  相似文献   

Volcanological and petrological evolution of Nyiragongo volcano,Virunga volcanic field,Zaire     

Alain Demant  Patrick Lestrade  Ruananza T Lubala  Ali B Kampunzu  Jacques Durieux 《Bulletin of Volcanology》1994,56(1):47-61

Three major phases are distinguished during the growth of Nyiragongo, an active volcano at the western limit of the Virunga Range, Zaire. Lavas erupted during phase 1 are strongly undersaturated melilitites characterized by the presence of kalsilite phenocrysts, perovskite, and the abundance of calcite in the matrix. Such lavas crop out mainly on the inner crater wall and progressively evolve toward more aphyric melilite nephelinites well represented on the flanks of the volcano. Adventive vents lying at the base of the cone developed along radial fracture systems and erupted olivine and/or clinopyroxene – rich melilitites or nephelinites. Stage 2 lavas are melilite-free nephelinites. Clinopyroxene is the main phenocryst and feldspathoids are abundant in the lavas exposed on the crater wall. These flows result from periodic overflowing of a magma column from an open crater. Extensive fissure flows which erupted from the base of the cone at the end of this stage are related to widespread draining out of magma which in turn induces the formation of the summit pit crater. Magmas erupted during stage 3 are relatively aphyric melilite nephelinites and the main volcanological characteristic is the permanent lava lake observed into the pit crater until the 1977 eruption. Fluctuations of the level of the lava lake was responsible for the development of the inner terraces. Periodic overflowing of the lava lake from the central pit formed the nepheline aggregate lava flows. Petrography and major element geochemistry allow the determination of the principal petrogenetic processes. Melilitites and nephelinites erupted from the summit crater are lavas derived, via clinopyroxene fractionation, from a more primitive melt. The abundance of feldspathoids in these lavas is in keeping with nepheline flotation. Aphyric melilite nephelinites covering the flanks and the extensive fissure flows have a homogeneous chemical composition; rocks from the historical lava lake are slightly more evolved. All these lavas differentiated in a shallow reservoir. Lavas erupted from the parasitic vents are mainly olivine and/or clinopyroxene-phyric rocks. Rushayite and picrites from Muja cone are peculiar high-magnesium lavas resulting from the addition of olivine xenocrysts to melilitic or nephelinitic melts. Fluid and melt inclusions in olivine and clinopyroxene phenocrysts indicate a crystallization depth of 10–14 km. A model involving two reservoirs located at different depths and periodically connected is proposed to explain the petrography of the lavas; this hypothesis is in accordance with geophysical data. Received: July 8, 1993/Accepted: September 10, 1993  相似文献   

Palaeomagnetic investigation of Middle Devonian limestones of Algeria and the Gondwana reconstruction     

Brigitte Smith  Alexis Moussine-Pouchkine  Ali Aït Kaci Ahmed 《Geophysical Journal International》1994,119(1):166-186

  相似文献   

Recent ecological changes in the Nile System in the Sudan     

A. I. El Moghraby Ph.D.  M. Tag el Seed Ph.D.  F. Sinada Ph.D.  O. M. Ali Ph.D. 《GeoJournal》1986,13(4):417-419

  相似文献