Petrographic, mineralogical and geochemical investigations were carried out on representative?samples from the Mudawwara-Quwayra Dike (MQD) in southernJordan. The MQD intruded Paleozoic and Cretaceous rocks as sub-ver...Petrographic, mineralogical and geochemical investigations were carried out on representative?samples from the Mudawwara-Quwayra Dike (MQD) in southernJordan. The MQD intruded Paleozoic and Cretaceous rocks as sub-vertical basaltic plugs, striking NW-SE along a fault zone and extending for more than 100 km. The MQD forms irregularly positive features, and is represented by symmetrical, elliptical, elongated or circular hills. It comprises thin basaltic layers intercalated?with pyroclastics and inclusions of different size and lithology, including limestone, sandstone, phosphate, quartzite, and marble. Petrographically, the rock exhibits phyric, porphyritic, vitrophyric and locally glomerophyritic textures manifested by plagioclase, clinopyroxene and rare?olivine and set in a matrix of plagioclase, pyroxene, brown glass and opaque phases. Clinopyroxene?and olivine phenocyrsts show disequilibrium textures such as reaction/resorbed rims in the?forms of corroded ends. The paragenetic sequence shows that olivine is the first phase to be crystallized and coexisting with pyroxene at sometime, while pyroxene continues crystallization. Plagioclase might have crystallized in contemporaneous later than the pyroxene. The MQD rocks are classified?as basalt and exhibit a narrow range of silica with a unique subalkaline affinity. This is most?probably attributed to assimilation of the abundant siliciclastic inclusions by the ascending magma. Emplacement of the MQD is attributed to regional phase of magmatism in Jordan and Saudi Arabia, which is probably the peripheral extension of a large magmatic event widely exposed in the Red Sea realm.展开更多
The Nyakasura caves and waterfall geosite of stalagmites and stalactites （191,271 m E, 74,776 m N） locally referred to as ＇Amabere ga Nyina Mwiru＇ is part of the Nyakasura--Fort Portal volcanic field and scenic ar...The Nyakasura caves and waterfall geosite of stalagmites and stalactites （191,271 m E, 74,776 m N） locally referred to as ＇Amabere ga Nyina Mwiru＇ is part of the Nyakasura--Fort Portal volcanic field and scenic area. The geosite is one of the country＇s most exciting and educative features. This geosite has been long known and several legends about it were written and taught in schools. The site is taken care of by a family of the Rubomboras in whose home is situated and also referred to as the Wonder of Uganda and named Camp Beseri. The other beautiful sites include the landscape, panorama, the calderas, lava domes, water bearing and dry craters, fauna and flora and others viewed from the Kyeganywa hill （192391, 75681; 1,594 m, 00°41＇2.0682＂ N, 30°14＇11.3244＂ E） in Kabarole district. The nation＇s capacity to strengthen geopark development lies in funding the development activities and inviting or attracting geopark expatriates as well as investors. The geopark development is fundamental for harnessing geotourism which is one of the opportunities Uganda has for achieving faster socio-economic transformation as per Uganda＇s Vision 2040.展开更多
In the paper a little known large 4-folio map of the territory of the later US states Virginia and Maryland is introduced. The map, which was surveyed and composed between 1660 and 1670, is exceptional from several po...In the paper a little known large 4-folio map of the territory of the later US states Virginia and Maryland is introduced. The map, which was surveyed and composed between 1660 and 1670, is exceptional from several points of view: the vast impenetrable territory covering a strip of land of about 700 × 400 km was mapped by one man, Augustin Herrman “Bohemian” (as he called himself) and by his crew during 10-year surveying and trigonometric measurements. It seems that this extraordinary map belongs among the first geodetically surveyed maps of the American territory. In 1960 altogether 5 copies of the map, complete in four parts, were known in British, French and American Libraries and map collections.展开更多
In this paper, we present a new robust hybrid algorithm combining successively chaotic encryption and blind watermarking of images based on the quaternionic wavelet transform (QWT) to ensure the secure transfer of dig...In this paper, we present a new robust hybrid algorithm combining successively chaotic encryption and blind watermarking of images based on the quaternionic wavelet transform (QWT) to ensure the secure transfer of digital data. The calculations of the different evaluation parameters have been performed in order to determine the robustness of our algorithm to certain attacks. The application of this hybrid algorithm on CFA (Color Filter Array) images, allowed us to guarantee the integrity of the digital data and to propose an autonomous transmission system. The results obtained after simulation of this successive hybrid algorithm of chaotic encryption and then blind watermarking are appreciated through the values of the evaluation parameters which are the peak signal-to-noise ratio (PSNR) and the correlation coefficient (CC), and by the visual observation of the extracted watermarks before and after attacks. The values of these parameters show that this successive hybrid algorithm is robust against some conventional attacks.展开更多
文摘Petrographic, mineralogical and geochemical investigations were carried out on representative?samples from the Mudawwara-Quwayra Dike (MQD) in southernJordan. The MQD intruded Paleozoic and Cretaceous rocks as sub-vertical basaltic plugs, striking NW-SE along a fault zone and extending for more than 100 km. The MQD forms irregularly positive features, and is represented by symmetrical, elliptical, elongated or circular hills. It comprises thin basaltic layers intercalated?with pyroclastics and inclusions of different size and lithology, including limestone, sandstone, phosphate, quartzite, and marble. Petrographically, the rock exhibits phyric, porphyritic, vitrophyric and locally glomerophyritic textures manifested by plagioclase, clinopyroxene and rare?olivine and set in a matrix of plagioclase, pyroxene, brown glass and opaque phases. Clinopyroxene?and olivine phenocyrsts show disequilibrium textures such as reaction/resorbed rims in the?forms of corroded ends. The paragenetic sequence shows that olivine is the first phase to be crystallized and coexisting with pyroxene at sometime, while pyroxene continues crystallization. Plagioclase might have crystallized in contemporaneous later than the pyroxene. The MQD rocks are classified?as basalt and exhibit a narrow range of silica with a unique subalkaline affinity. This is most?probably attributed to assimilation of the abundant siliciclastic inclusions by the ascending magma. Emplacement of the MQD is attributed to regional phase of magmatism in Jordan and Saudi Arabia, which is probably the peripheral extension of a large magmatic event widely exposed in the Red Sea realm.
文摘The Nyakasura caves and waterfall geosite of stalagmites and stalactites （191,271 m E, 74,776 m N） locally referred to as ＇Amabere ga Nyina Mwiru＇ is part of the Nyakasura--Fort Portal volcanic field and scenic area. The geosite is one of the country＇s most exciting and educative features. This geosite has been long known and several legends about it were written and taught in schools. The site is taken care of by a family of the Rubomboras in whose home is situated and also referred to as the Wonder of Uganda and named Camp Beseri. The other beautiful sites include the landscape, panorama, the calderas, lava domes, water bearing and dry craters, fauna and flora and others viewed from the Kyeganywa hill （192391, 75681; 1,594 m, 00°41＇2.0682＂ N, 30°14＇11.3244＂ E） in Kabarole district. The nation＇s capacity to strengthen geopark development lies in funding the development activities and inviting or attracting geopark expatriates as well as investors. The geopark development is fundamental for harnessing geotourism which is one of the opportunities Uganda has for achieving faster socio-economic transformation as per Uganda＇s Vision 2040.
文摘In the paper a little known large 4-folio map of the territory of the later US states Virginia and Maryland is introduced. The map, which was surveyed and composed between 1660 and 1670, is exceptional from several points of view: the vast impenetrable territory covering a strip of land of about 700 × 400 km was mapped by one man, Augustin Herrman “Bohemian” (as he called himself) and by his crew during 10-year surveying and trigonometric measurements. It seems that this extraordinary map belongs among the first geodetically surveyed maps of the American territory. In 1960 altogether 5 copies of the map, complete in four parts, were known in British, French and American Libraries and map collections.
文摘In this paper, we present a new robust hybrid algorithm combining successively chaotic encryption and blind watermarking of images based on the quaternionic wavelet transform (QWT) to ensure the secure transfer of digital data. The calculations of the different evaluation parameters have been performed in order to determine the robustness of our algorithm to certain attacks. The application of this hybrid algorithm on CFA (Color Filter Array) images, allowed us to guarantee the integrity of the digital data and to propose an autonomous transmission system. The results obtained after simulation of this successive hybrid algorithm of chaotic encryption and then blind watermarking are appreciated through the values of the evaluation parameters which are the peak signal-to-noise ratio (PSNR) and the correlation coefficient (CC), and by the visual observation of the extracted watermarks before and after attacks. The values of these parameters show that this successive hybrid algorithm is robust against some conventional attacks.
