555 research outputs found
Mecaster duncani Mohamed Abdelhamid & Moustafa Azab 2012, n. comb.
No full textMecaster duncani (Fourtau, 1906) n. comb. (Figs 15N; 17F) Linthia duncani Fourtau, 1906: 162, pl. 3, figs 1-4. Periaster duncani – Abdelhamid & El Qot 2001: 29, fig. 7N. MATERIAL EXAMINED. — 29 specimens from the Turonian (Wata Formation) of Wadi Dakhl, ASUDLE187-215, Wadi Dakhl echinoid horizon 1 (DEH 1) and 18 from the same stage of Wadi Abu Qaada, ASUAQE170-187, Wadi Abu Qaada echinoid horizon 1 (QEH 1). MEASUREMENTS. — See Table 15. DESCRIPTION Test polygonal.Maximum width lies slightly behind the distal ends of anterior paired petals. Apical disc semi-ethmolytic, transverse, centric to slightly eccentric anteriorly.Frontal ambulacrum nonpetaloid, and relatively deep.Paired ambulacra deep, wide, and petaloid. Peristome pentagonal, transverse, and labiates. There are two types of fascioles: a wide band of peripetalous ortho- to parafasciole (sensu Néraudeau et al. 1998) and a fine band of lateroanal parafasciole. R EMARKS Many authors considered that the post-Cenomanian Mecaster Pomel, 1883 species can develop two fascioles (peripetalous and latero-anal) in fine grained sediments (Lambert 1921; Zaghbib-Turki 1989, 1990; Néraudeau 1994; Villier et al. 2004). Accordingly, many species previously referred to Periaster d’Orbigny, 1853 are attributed to Mecaster (bifasciata ecological varieties of the typical Mecaster species). The present species has long, sub-equal, moderately depressed paired petals. The apical disc is semi-ethmolytic (madreporite separates genital plates 1and 4). Fascioles are composed of a wide band of peripetalous ortho- to parafasciole sensu Néraudeau et al. (1998) and a narrow band of latero-anal parafasciole sensu Néraudeau et al. (1998; bifasciata stage). The labrum is triangular and long, and the sternal plates are approximately symmetric (Fig. 17F). These characters refer this species to genus Mecaster.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on pages 607-608, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Interview with Mohamed Azab
No full textمقابلة مع الفنان التشكيلي المصري وأستاذ بأكاديمية الفنون ومدير قصر السينما بالقاهرة، محمد عزب، يناقش فيها معارضه، خاصتاً أخر ثلاث معارض بڨيينا. يتحدث عن عملة الفني شكلا ومضمونا، ورؤيتة وإهتماماتة المختلفة، وما يقوم به كمدير لقصر السينما في نشر الثقافة السنيمائية. قام بالمقابلة حسن شمس الدين.An interview with Egyptian artist, professor at the Academy of Arts, and director of the Cinema Palace in Cairo, Mohamed Azab, in which he discusses his exhibitions, especially his latest three held in Vienna. He also talks about the form and content of his artist, his vision and his various interests, and his work in spreading cinematic culture as the director of the Cinema Palace. The interview was conducted by Hassan Shams El-Din
Interview with Mohamed Azab
No full textمقابلة مع الفنان التشكيلي المصري وأستاذ بأكاديمية الفنون ومدير قصر السينما بالقاهرة، محمد عزب، يناقش فيها معارضه، خاصتاً أخر ثلاث معارض بڨيينا. يتحدث عن عملة الفني شكلا ومضمونا، ورؤيتة وإهتماماتة المختلفة، وما يقوم به كمدير لقصر السينما في نشر الثقافة السنيمائية. قام بالمقابلة حسن شمس الدين.An interview with Egyptian artist, professor at the Academy of Arts, and director of the Cinema Palace in Cairo, Mohamed Azab, in which he discusses his exhibitions, especially his latest three held in Vienna. He also talks about the form and content of his artist, his vision and his various interests, and his work in spreading cinematic culture as the director of the Cinema Palace. The interview was conducted by Hassan Shams El-Din
Mecaster roachensis Mohamed Abdelhamid & Moustafa Azab 2012, n. comb.
No full text<i>Mecaster roachensis</i> (Gauthier, 1900) n. comb. (Fig. 15O) <p> <i>Periaster roachensis</i> Gauthier <i>in</i> Fourtau, 1900: 24, pl. 1, figs 13-15. — Abdelhamid 1997: 156, fig. 7 (9, 10).</p> <p>MATERIAL EXAMINED. — Two well preserved and numerous incomplete specimens from Abu Roash: Turonian (rudist unit), ASUARE152, Abu Roash echinoid horizon 1 (REH 1) and the Coniacian-Santonian (Ostrea and Plicatula unit), ASUARE153, Abu Roash echinoid horizon 4 (REH 4).</p> <p>DESCRIPTION</p> <p>Test size variable (L = 14.5-40.0mm) but mostly has large size. Outline heat-shape (W/L = 0.91-0.95).</p> <p>Anterior margin with a marked sulcus. Adapical surface sloped forwards. Maximum height lies directly behind apical disc (H/L = 0.62-0.70). Posterior surface with oblique to nearly vertical truncation. Adoral surface swollen at the plastron. Sternal plates are approximately equal. Apical disc semi-ethmolytic, centric, and transverse. Frontal ambulacrum nonpetaloid (NIII = 40), deep, wider than the paired petals and conspicuously notching the ambitus until the peristome. Paired ambulacra petaloid, deep, and relatively narrow. Anterior paired petals long (LII = 7.8-13.9 mm, NII = 30- 45). Posterior paired petals shorter (LI/LII = 0.80, NI = 30-45), narrower, and less divergent than the anterior paired petals.</p> <p>REMARKS</p> <p> This species has fairly long, slightly depressed paired petals. The posterior pair is relatively shallower and shorter than the anterior one. The apical disc is semi-ethmolytic (the madreporite separates the genital plates 1 and 4). Fascioles are a narrow band of peripetalous ortho- to parafasciole <i>sensu</i> Néraudeau <i>et al.</i> (1998) and a narrow band of lateroanal parafasciole (bifasciata stage). The labrum is triangular and long. The sternal plates are nearly symmetric. As discussed in the previous species, regards the relation between the two genera <i>Periaster</i>, d’Orbigny, 1853 and <i>Mecaster</i>, the characters of the present species attribute it to the genus <i>Mecaster</i>. <i>Mecaster roachensis</i> n. comb. is distinguished from <i>Mecaster fourneli</i> in having lateroanal parafascioles, maximum width lies at the mid distance between anterior and posterior of test, more centric apical disc, and wider frontal ambulacrum.</p>Published as part of <i>Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3)</i> on page 608, DOI: 10.5252/g2012n3a7, <a href="http://zenodo.org/record/5378120">http://zenodo.org/record/5378120</a>
FIG. 1 in Turonian-Santonian echinoids from Egypt
No full textFIG. 1. — Location map showing the localities (�) from which the present material was collected in Egypt.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on page 577, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Cooperative Autonomous Resilient Defense Platform for Cyber-Physical Systems
No full textCyber-Physical Systems (CPS) entail the tight integration of and coordination between computational and physical resources. These systems are increasingly becoming vital to modernizing the national critical infrastructure systems ranging from healthcare, to transportation and energy, to homeland security and national defense. Advances in CPS technology are needed to help improve their current capabilities as well as their adaptability, autonomicity, efficiency, reliability, safety and usability. Due to the proliferation of increasingly sophisticated cyber threats with exponentially destructive effects, CPS defense systems must systematically evolve their detection, understanding, attribution, and mitigation capabilities. Unfortunately most of the current CPS defense systems fall short to adequately provision defense services while maintaining operational continuity and stability of the targeted CPS applications in presence of advanced persistent attacks. Most of these defense systems use un-coordinated combinations of disparate tools to provision defense services for the cyber and physical components. Such isolation and lack of awareness of and cooperation between defense tools may lead to massive resource waste due to unnecessary redundancy, and potential conflicts that can be utilized by a resourceful attacker to penetrate the system.
Recent research argued against the suitability of the current security solutions to CPS environments. We assert the need for new defense platforms that effectively and efficiently manage dynamic defense missions and toolsets in real-time with the following goals:
1) Achieve asymmetric advantage to CPS defenders, prohibitively increasing the cost for attackers;
2) Ensure resilient operations in presence of persistent and evolving attacks and failures; and
3) Facilitate defense alliances, effectively and efficiently diffusing defense intelligence and operations transcending organizational boundaries.
Our proposed solution comprehensively addresses the aforementioned goals offering an evolutionary CPS defense system. The presented CPS defense platform, termed CyPhyCARD (Cooperative Autonomous Resilient Defenses for Cyber-Physical systems) presents a unified defense platform to monitor, manage, and control the heterogeneous composition of CPS components. CyPhyCARD relies on three interrelated pillars to construct its defense platform. CyPhyCARD comprehensively integrates these pillars, therefore building a large scale, intrinsically resilient, self- and situation-aware, cooperative, and autonomous defense cloud-like platform that provisions adequate, prompt, and pervasive defense services for large-scale, heterogeneously-composed CPS. The CyPhyCARD pillars are:
1) Autonomous management platform (CyberX) for CyPhyCARD's foundation. CyberX enables application elasticity and autonomic adaptation to changes by runtime diversity employment, enhances the application resilience against attacks and failures by multimodal recovery mechanism, and enables unified application execution on heterogeneously composed platforms by a smart employment of a fine-grained environment-virtualization technology.
2) Diversity management system (ChameleonSoft) built on CyberX. ChameleonSoft encrypts software execution behavior by smart employment of runtime diversity across multiple dimensions to include time, space, and platform heterogeneity inducing a trace-resistant moving-target defense that works on securing CyPhyCARD platform against software attacks.
3) Evolutionary Sensory system (EvoSense) built on CyberX. EvoSense realizes pervasive, intrinsically-resilient, situation-aware sense and response system to seamlessly effect biological-immune-system like defense. EvoSense acts as a middle layer between the defense service provider(s) and the Target of Defense (ToD) creating a uniform defense interface that hides ToD's scale and heterogeneity concerns from defense-provisioning management.
CyPhyCARD is evaluated both qualitatively and quantitatively. The efficacy of the presented approach is assessed qualitatively, through a complex synthetic CPS attack scenario. In addition to the presented scenario, we devised multiple prototype packages for the presented pillars to assess their applicability in real execution environment and applications. Further, the efficacy and the efficiency of the presented approach is comprehensively assessed quantitatively by a set of custom-made simulation packages simulating each CyPhyCARD pillar for performance and security evaluation. The evaluation illustrated the success of CyPhyCARD and its constructing pillars to efficiently and effectively achieve its design objective with reasonable overhead.Ph. D
Rachiosoma rectilineatum
No full textRachiosoma rectilineatum (Péron & Gauthier, 1881) (Fig. 8G) Cyphosoma rectilineatum Péron & Gauthier in Cotteau, Péron & Gauthier, 1881: 104, pl. 7, figs 1-4. Rachiosoma rectilineatum – Geys 1992: 147, pl. 2, figs 8-9. — El Qot 2010: 272, pl. IV, figs 2a, b, 4, 5, text-fig. 5b. MATERIAL EXAMINED. — 13 measured specimens and many non-measured ones from the Coniacian-Santonian (Matulla Formation) of Wadi Dakhl, ASUDLE2-14, Wadi Dakhl echinoid horizon 3 (DEH 3). MEASUREMENTS. — See Table 4. DESCRIPTION Adapical surface convex. Adoral surface feebly depressed around peristome. Ambulacral areas relatively wide, narrowed near apical disc. Poriferous zones uniserial, straight. Major ambulacral plates quadrigeminate, but trigeminate on adoral surface. Interradial extrascrobicular surface narrow. Adradial extrascrobicular surface relatively wide and occupied by very small tubercles lying near adradial suture, beside numerous granules. REMARKS This species is known from the Santonian of Algeria, Egypt and Jordan. Geys (1992) recorded it from the basal part of the Turonian in Wadi Qena, Egypt.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on pages 590-592, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Phymosoma baylei
No full textPhymosoma baylei (Cotteau, 1864) (Figs 5I; 6G; 7A, B) Cyphosoma baylei Cotteau, 1864: 584, pl. 1138, figs8-13; pl. 1139, figs 1-6. Phymosoma baylei – Abdelhamid & El Qot 2001: 13, fig. 4L. MATERIAL EXAMINED. — Two specimens: one from the Turonian (Wata Formation) of Wadi Dakhl, ASUDLE1, Wadi Dakhl echinoid horizon 1 (DEH 1) and one from Wadi Abu Qaada, ASUAQE3, Wadi Abu Qaada echinoid horizon 1 (QEH 1). DESCRIPTION Test diameter attaining 24.5-30.0 mm. Adoral surface flattened. Adapical surface convex (H/D= 0.39-0.43). Poriferous zones biserial and wide adapically. Major ambulacral plates trigeminate near peristome, polygeminate with five pore pairs arranged in arc at the ambitus (Fig. 7A), whereas near apical disc, each major ambulacral plate carries six pore pairs (Fig. 6G). Adradial extrascrobicular surface relatively wide and occupied by secondary tubercles and frequent granules (Fig. 7B). REMARKS The present species (Fig.6G) is distinguished from P. abbatei in having conspicuous and wide biserial poriferous zones in adapical surface, larger ambulacral tubercles in adapical surface, and more ambulacral and interambulacral tubercles per one column (Na = 12 vs 7-10; Ni = 11 vs 7-10). Devriès (1960) indicated that the poriferous zone of P. baylei is uniserial in specimens less than 15 mm diameter and that the biserial arrangement increases with the size of the individuals.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on pages 584-586, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Desoricidaris aegyptica
No full textDesoricidaris aegyptica (Fourtau, 1914) (Fig. 5A) Leiocidaris aegyptica Fourtau, 1914: 4, pl. 1, fig. 2. Desoricidaris aegyptica – Geys 1992: 143. MATERIAL EXAMINED. — Several test fragments from the Coniacian-Santonian of Abu Roash (Ostrea and Plicatula unit), ASUARE1, Abu Roash echinoid horizon 4 (REH 4). DESCRIPTION Ambulacra narrow, flexuous. Pores in each pore pair equal, oval, conjugate. Pore pairs separated by ridges. Interporiferous zone occupied by four horizontal granules, the outer granules slightly larger than the inner. Interambulacra with two rows of well-developed, perforate, non-crenulated primary tubercles. Areoles shallow, nearly round, surrounded by conspicuous scrobicular tubercles. Adradial extrascrobicular surface null. Interradial extrascrobicular surface narrow. REMARKS The relation between the genera Phyllacanthus Brandt, 1835, Leiocidaris Desor, 1855, Rhabdocidaris Desor, 1855 and Desoricidaris Geys, 1992 was discussed by Abdelhamid (1997).Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on page 580, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
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