First-order secular planetary theory up to fourth power in eccentricities and inclinations     

Osman M. Kamel 《Astrophysics and Space Science》1979,64(1):227-238

We construct a first-order secular general planetary theory, using the Jacobi-Radau set of origins, referring to common fixed plane and in terms of Poincaré canonical variables. We neglect powers higher than the fourth with respect to the eccentricities and sines of inclinations.  相似文献   

Patterns of tourist destination-choice and travel behaviour among members of the urban and rural Arab community of Israel: A comparative study of Haifa and Ibilin     

Yoel Mansfeld  Kamel Ya'acoub 《GeoJournal》1995,35(4):459-470

The destination-choice and travel behaviour of urban Arab-Israelis from Haifa, and rural Arab-Israelis from the village of Ibillin, are compared. The study examines the role of tradition, socio-economic background and geographical location of residence, in designing the two communities' destination-choice and travel behaviour. The results show that while socio-economic characteristics and life in a city or in a village do not differentiate between the two communities, religious affiliation does play a major role in determining the destination-choice and tourist behaviour of the two sub-communities. It was also found that the predominant factors that shape Arab-Israelis' tourist behaviour are the familiarity factors and that social rather than personal constraints play a major role in deciding which tourist destination is chosen. Policy oriented conclusions are presented in the light of these findings.  相似文献   

The expansion of negative powers of the mutual distance between two planets     

Osman M. Kamel  Adel S. Soliman 《Earth, Moon, and Planets》1988,43(3):197-200

An outline of a new method is given to obtain the expansion of ^–S by the method of W. M. Smart, using Taylor theorem and neglecting powers higher than the fourth in the eccentricity and inclination.  相似文献   

A pan-sharpening method based on NSCT and formulated as compressive sensing problem     

Sarah Mazari  Miloud Chikr El Mezouar  Kamel Belloulata 《国际地球制图》2016,31(10):1142-1157

In this paper, a pan-sharpening method, using non-subsampled contourlet transform (NSCT) and the theory of compressive sensing (CS), is proposed. The NSCT is used for sparse image representation to perform a multiscale and directional decomposition of source images in order to express their detail and express the sparsity of their high frequency. The CS is used to merge the multispectral (MS) and panchromatic (pan) images from partial random measurements. Two different fusion rules are then applied. The final pan-sharpened image is obtained by inverse NSCT. Experimental results show the efficiency of the proposed method, compared with pan sharpening based on standard NSCT, in terms of visual quality and objective assessment. Moreover, the proposed technique is very effective when the storage and transmission bandwidth are limited.  相似文献   

Relationship between Na<Subscript>2</Subscript>SO<Subscript>4</Subscript> concentration and thermal response of reconstituted stone in the laboratory and on site     

Céline Thomachot-Schneider  Maxime Gommeaux  Norman Lelarge  Alexandra Conreux  Kamel Mouhoubi  Jean-Luc Bodnar  Patricia Vázquez 《Environmental Earth Sciences》2016,75(9):762

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Structural cutting of a region showing various compound tectonic deformations (example of Bouficha–Grombalia region)     

Houcem Mzali  Hédi Zouari 《Arabian Journal of Geosciences》2012,5(6):1399-1409

Bouficha–Grombalia region shows complex tectonic deformations and is affected by faults and folds of different geometry. A structural study has allowed to determine that Bouficha–Grombalia region is affected by significant faults of EW, NE-SW and NW-SE directions. These faults divide Bouficha–Grombalia region into several compartments. We distinguish three important structures whose first is in the SW which corresponds to Zaghouan–Bouficha trough. The second structure is situated in the NE, which corresponds to the Grombalia trough. The third structure occupies a central position; it consists in the Bouficha–Grombalia high structure. The last structure is composed by three blocks. Each block is characterised by particular folds geometry. These structures were outlined at least from middle Miocene, and they have undergone the effect of subsequent compressive tectonic events which have led to folds building above or counter the pre-existing NE-SW faults.  相似文献   

The hydrochemical characteristics and evolution of groundwater and surface water in the western part of the River Nile, El Minia district, Upper Egypt     

Mohamed El Kashouty  Esam El Sayed  Aly Aly Kamel 《Arabian Journal of Geosciences》2012,5(4):637-652

A combination of major and trace elements have been used to characterize surface- and groundwater in El Minia district, Egypt. Surface water versus groundwater chemistry data enabled geographical zonation and chemical types to be differentiated. The main target of this research is to investigate the groundwater quality and hydrochemical evaluation. The situation is further complicated by contamination with lithogenic and anthropogenic (agricultural and sewage wastewaters) sources and low plan exploitation techniques. The investigated Pleistocene aquifer is composed of sand and gravel of different sizes, with some clay intercalation. The semi-confined condition was around the River Nile shifted to unconfine outside the floodplain. The groundwater flow generally from south to north and locally diverts towards the western part from the River Nile. Fifty-six, 11, five, and two water samples were collected from the Pleistocene aquifer, River Nile, Ibrahimia canal, and Al Moheet drain, respectively. The collected water samples were analyzed for major and trace elements. The toxic metal concentrations of Al Moheet drain are higher than those in the River Nile and the Ibrahimia canal. Cr, Hg, As, and Cd concentrations in the River Nile and Ibrahimia canal are fluctuated above and below the WHO drinking standards. Se concentration in River Nile and Ibrahimia canal is below WHO drinking and irrigation guidelines. Total dissolved solid content in groundwater is generally low, but it is increased due to the western part of the study area. The geographic position of the River Nile, Ibrahimia canal, and Al Moheet drain impact on the groundwater quality. The PHREEQC confirm the high mixing proportions from the River Nile into the groundwater and decline away from it. In addition to the thicknesses of the Pleistocene, aquifer and aquitard layer enhance the River Nile and agricultural wastewaters intrusion into the aquifer system. The toxic metal concentrations (Pb, Cd, Cr, PO₄, Se, Mn, As, Hg, Ni, Al, Fe, and SIO₂) in groundwater were increased mainly in the northwestern and southeastern part (far from the River Nile). It is attributed to anthropogenic, high vulnerability rate (unconfined), and partially to lithogenic. In most localities, the groundwater are unsuitable for drinking and irrigation purposes with respect to Se concentration, while they are unsuitable for dinking according Mn, As, and Hg contents. There are some Cd and Pb anomalies concentrations, which cause severe restriction if used in irrigation. The results suggested that significant changes are urgently needed in water use strategy to achieve sustainable development.  相似文献   

Survival of Vibrio alginolyticus in seawater and retention of virulence of its starved cells     

Ben Kahla-Nakbi A  Besbes A  Chaieb K  Rouabhia M  Bakhrouf A 《Marine environmental research》2007,64(4):469-478

The aim of this study was to evaluate the survival responses of four strains of Vibrio alginolyticus in seawater under starvation conditions. We used microcosms containing sterilised seawater and incubated at ambient temperature (22-25 degrees C). V. alginolyticus maintained its culturability for at least nine months. Long-term-starved cells showed an absence or a decrease in their enzymatic activities. Resuscitation assays of viable but non-culturable (VBNC) cells were conducted and the recovery of these cells was achieved after the addition of nutrients. Amplified 16S ribosomal DNA (rDNA) restriction analysis (ARDRA) was used to confirm that the same strain of V. alginolyticus persisted in all microcosms during a long period of time. Starved cells maintained their infectivity for gilt head sea bream (Sparus aurata) and sea bass (Dicentrachus labrax) as determined by intraperitoneal challenges.  相似文献   

Planar SAS for Sea Bottom and Subbottom Imaging: Concept Validation in Tank     

Afif Belkacem Kamel Besbes Jacques Chatillon Manell E. Zakharia 《Oceanic Engineering, IEEE Journal of》2006,31(3):614-627

The paper deals with a new concept of imaging technique based on planar synthetic aperture sonar (P-SAS). P-SAS processing takes advantage of the overlap of both ping-to-ping and track to track footprints to improve the imaging resolution in both directions. After describing the method, its implementation is discussed. The exact implementation [three-dimensional (3-D)] is defined and an approximated and faster approach [2timestwo-dimensional (2-D)] is then proposed. The gain in computation time and the possible loss in performances (resolutions, echo amplitude) are investigated by simulating a simple point target. The point spread function is studied in details. The new concept is finally validated by tank experiments (scale about 100) for both proud and buried target imaging  相似文献   

Expansion of the first-order planetary disturbing function by Smart's method     

Osman M. Kamel  Adel S. Soliman 《Earth, Moon, and Planets》1989,47(3):241-263

We expand the principal part of the planetary disturbing function, by Smart's method, using Taylor's theorem. In our expansion we neglect terms of degree higher than the fourth in the eccentricities and tangents of the inclinations.Now at the JPL Pasadena, California.  相似文献