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Mechanical and Geometrical Tortuosities: Vanishing and Appearing Tortuosities
SPE Annual Technical Conference and Exhibition, 2021ABSTRACT Tortuosity is one of the critical factors to be considered for complex directional well trajectories, complicated build rates, precise steering in thin reservoirs, and extended reach wells. This paper discusses the pitfalls of estimating tortuosity to quantify borehole quality and answers questions, such as whether the claimed ...
Robello Samuel +2 more
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Radiology
Arterial tortuosity syndrome (ATS) is a rare, autosomal recessive, connective tissue disorder. It causes elongation and tortuosity of large and medium-sized arteries with consequent dilatation and/or stenosis. Other features of ATS include: skin/joint laxity, hernia formation, distinct facial features, cardiac valvular regurgitation and other cardiac ...
Brecht Van Berkel, Vincent Sneyers
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Arterial tortuosity syndrome (ATS) is a rare, autosomal recessive, connective tissue disorder. It causes elongation and tortuosity of large and medium-sized arteries with consequent dilatation and/or stenosis. Other features of ATS include: skin/joint laxity, hernia formation, distinct facial features, cardiac valvular regurgitation and other cardiac ...
Brecht Van Berkel, Vincent Sneyers
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American Journal of Medical Genetics, 2000
We describe a patient with arterial tortuosity syndrome (ATS), a rare disorder comprising generalized tortuosity and elongation of all major arteries, soft skin, joint laxity, severe keratoconus, and diffuse tortuosity of the carotids and of intracranial arteries. The patient's probably affected brother and sister died at an early age.
Franceschini P +4 more
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We describe a patient with arterial tortuosity syndrome (ATS), a rare disorder comprising generalized tortuosity and elongation of all major arteries, soft skin, joint laxity, severe keratoconus, and diffuse tortuosity of the carotids and of intracranial arteries. The patient's probably affected brother and sister died at an early age.
Franceschini P +4 more
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1988
Vessel curvature or tortuosity has usually been ignored in haemodynamic studies of the vasculature, vessels are commonly assumed to be straight and axisymmetric. This assumption is generally not valid and even for those vessels which are relatively straight in early life, such as the abdominal aorta, there is a tendency to develop tortuosity with ...
C M, Wenn, D L, Newman
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Vessel curvature or tortuosity has usually been ignored in haemodynamic studies of the vasculature, vessels are commonly assumed to be straight and axisymmetric. This assumption is generally not valid and even for those vessels which are relatively straight in early life, such as the abdominal aorta, there is a tendency to develop tortuosity with ...
C M, Wenn, D L, Newman
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Tortuosity of Porous Particles
Analytical Chemistry, 2007Tortuosity is often used as an adjustable parameter in models of transfer properties through porous media. This parameter, not reducible to classical measured microstructural parameters like specific surface area, porosity, or pore size distribution, reflects the efficiency of percolation paths, which is linked to the topology of the material.
M, Barrande, R, Bouchet, R, Denoyel
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Familial Retinal Arteriolar Tortuosity
JAMA Ophthalmology, 2016Anasymptomaticwoman inhermid-40swas referred for anopinion regardingunusual fundus findings. Visual acuitywas20/20OU. Fundus examination revealed tortuosity of the small and medium arterioles in both eyes, primarily in the macular region, without evidence of vascular occlusion, venous stasis, or ischemia on fluorescein angiography (Figure). Examination
M Ali, Khan +2 more
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World Journal for Pediatric and Congenital Heart Surgery, 2016
Arterial tortuosity syndrome is a rare autosomal recessive connective tissue disease characterized by elongation, tortuosity, and aneurysmal formation of the large and middle-sized arteries sometimes associated with stenosis of the pulmonary arteries and/or aorta. We present three cases of severe arterial tortuosity with different manifestations.
Alain Cubero +5 more
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Arterial tortuosity syndrome is a rare autosomal recessive connective tissue disease characterized by elongation, tortuosity, and aneurysmal formation of the large and middle-sized arteries sometimes associated with stenosis of the pulmonary arteries and/or aorta. We present three cases of severe arterial tortuosity with different manifestations.
Alain Cubero +5 more
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Nature, 1961
THE tortuosity, T, of a porous medium such as sandstone is a quantity that has been interpreted in various and sometimes conflicting ways, particularly its relation to porosity, ϕ, and formation factor, F (refs. 1–4). Tortuosity originally was understood to mean the square of the quotient average length of a flow-line divided by the net distance ...
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THE tortuosity, T, of a porous medium such as sandstone is a quantity that has been interpreted in various and sometimes conflicting ways, particularly its relation to porosity, ϕ, and formation factor, F (refs. 1–4). Tortuosity originally was understood to mean the square of the quotient average length of a flow-line divided by the net distance ...
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Atmospheric Research, 1988
Abstract Characteristics of lightning tortuosity from a number of investigations are studied, and the tentative conclusion reached is that tortuosity stems primarily from a lack of electric field directivity at the head of the lightning flash leader.
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Abstract Characteristics of lightning tortuosity from a number of investigations are studied, and the tentative conclusion reached is that tortuosity stems primarily from a lack of electric field directivity at the head of the lightning flash leader.
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