Some Numerical Results in 3-D Transient Linear Naval Hydrodynamics

1991 ◽  
Vol 35 (04) ◽  
pp. 295-303
Author(s):  
G. Pot ◽  
A. Jami
Keyword(s):  
Three Dimensional ◽  
Vertical Displacement ◽  
Numerical Results ◽  
The Body ◽  
Infinite Depth ◽  
Transient Flows ◽  
Forced Motion ◽  
Submerged Body ◽  
History Of ◽  
Fundamental Equations

Some numerical results obtained by the code MELINA are given. This code has been designed for the solution of three-dimensional steady and transient flows past a floating or submerged body; the fundamental equations of dynamics are taken into account in the case where the body is freely floating. Only the case of an ocean of infinite depth is addressed here. It is shown that convergence to a steady state is achieved in the case of a periodic forced motion if the history of the motion is correctly taken into account. Also, the case of a freely floating sphere with initial vertical displacement from equilibrium is treated and compared with experiments.

scholarly journals MRI Study on Tibial Nerve of the Ankle Canal and Its Branches:A method of multiplanar reconstruction with 3D-FIESTA-C sequences

2021 ◽  
Author(s):  
Yan Zhang ◽  
Xucheng He ◽  
Juan Li ◽  
Ju Ye ◽  
Wenjuan Han ◽  
...  
Keyword(s):  
Tibial Nerve ◽  
Three Dimensional ◽  
The Body ◽  
Medial Malleolus ◽  
Bifurcation Points ◽  
Lateral Plantar Nerve ◽  
Good Imaging ◽  
Starting Point ◽  
History Of ◽  
Mri Study

Abstract Background: The visualization of the tibial nerve and its branches in the ankle canal is helpful for the diagnosis of local lesions and compression, and it is also useful for clinical observation and surgical planning.The aim of this study was to investigate the feasibility of three-dimensional dual-excitation balanced steady-state free precession sequence (3D-FIESTA-C) multiplanar reformation (MPR) display of the tibial nerve and its branches in the ankle canal.Methods:The subjects were 20 healthy volunteers (40 ankles), aged 22-50 years, with no history of ankle joint desease. The 3D-FIESTA-C sequence was used in the 3.0T magnetic resonance equipment for imaging. Duringscanning, each foot was at an angle of 90 degrees to the tibia.The tibial nerve of the ankle canal and its branches were displayed and measured at the same level throughMPR.Results: Most of the tibial nerve bifurcation points were located in the ankle canal (57.5%), few bifurcation points (42.5%) were located at the proximal end of the ankle canal, and none of them were found away from the distal end. The bifurcation between the medial plantar nerve and the lateral plantar nerve was on the line between the tip of the medial malleolus and the calcaneus, and it’s angle ranged between 6° and 35°. In MPR images, the display rates of both the medial calcaneal nerve and the subcalcaneal nerve were 100%, and the starting point of the subcalcaneal nerve was always at the distal end of the starting point of the medial calcaneal nerve. In 55% of cases, there were more than two medial calcaneal nerve innervations.Conclusion: The 3D-FIESTA-C MPR can display the morphological features and positions of the tibial nerve and its branches and the bifurcation point’s projection position can be marked on the body surface. This method not only benefited the imaging diagnosis of the tibial nerve and branch-related lesions in the ankle canal, but it also provided a good imaging basis to plan a clinical operation of the ankle canal and avoid surgical injury.

A dynamic evolution model for perfectly plastic plates

2016 ◽  
Vol 26 (10) ◽  
pp. 1825-1864 ◽  
Author(s):  
Giovanni Battista Maggiani ◽  
Maria Giovanna Mora
Keyword(s):  
Three Dimensional ◽  
Vertical Displacement ◽  
The Body ◽  
Reduced Model ◽  
Dynamic Evolution ◽  
Flow Rule ◽  
Perfectly Plastic ◽  
Body Load ◽  
Elastic Perfectly Plastic ◽  
Plastic Flow Rule

We consider the dynamic evolution of a linearly elastic-perfectly plastic thin plate subject to a purely vertical body load. As the thickness of the plate goes to zero, we prove that the three-dimensional evolutions converge to a solution of a certain reduced model. In the limiting model admissible displacements are of Kirchhoff–Love type. Moreover, the motion of the body is governed by an equilibrium equation for the stretching stress, a hyperbolic equation involving the vertical displacement and the bending stress, and a rate-independent plastic flow rule. Some further properties of the reduced model are also discussed.

4. Haemoglobin

2016 ◽  
pp. 59-82
Author(s):  
Chris Cooper
Keyword(s):  
Sickle Cell Disease ◽  
Protein Binding ◽  
Sickle Cell ◽  
Quaternary Structure ◽  
Chemical Interaction ◽  
Three Dimensional ◽  
The Body ◽  
Cell Disease ◽  
History Of ◽  
Haem Iron

‘Haemoglobin’ explains the key role played by this protein: binding oxygen in the lungs and carrying it around the blood circulation, where it is offloaded to every cell in the body. Haemoglobin has also played a key role in the history of our understanding of all proteins and the science of biochemistry. The complex, three-dimensional quaternary structure of haemoglobin was identified in 1960 by Max Perutz. A haemoglobin tetramer contains four haem groups and can bind four molecules of oxygen. Chemical interaction of oxygen with haem iron is explained along with diseases—such as sickle cell disease, thalassaemias, and haemoglobinopathies—caused by changes in the globin part of the protein.

scholarly journals The Body of Art

Corpus Mundi ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 62-87
Author(s):  
Shelton Waldrep
Keyword(s):  
Da Vinci ◽  
Three Dimensional ◽  
Ancient Egypt ◽  
The Body ◽  
Film And Television ◽  
Female Nude ◽  
Important Study ◽  
History Of ◽  
Erwin Panofsky ◽  
Fredric Jameson

As part of a larger study on the mainstreaming of pornography in contemporary film and television, this essay attempts to examine and extend our vocabulary for discussing visual representations of the human body by revisiting Kenneth Clark’s important study The Nude from 1972. Clark’s book provides a history of the male and female nude in two- and three-dimensional art from Ancient Egypt and Greece to the Renaissance and beyond. This essay focuses on places within his analysis that are especially generative for understanding pornography such as the importance of placing the nude form within a narrative (Venus is emerging from her bath, for example) or attempts by artists to suggest movement within static forms. The essay places Clark’s rich typology in conversation with other thinkers, such as Fredric Jameson, Erwin Panofsky, E. H. Gombrich, and Michel Foucault. The piece ends with a discussion of androgyny and hermaphroditism as they relate to the expression of gender in plastic art, especially the notion that all representations of the body necessarily include a gender spectrum within one figure. Artists whose work is looked at in some detail include Da Vinci, Michelangelo, and Donatello.

scholarly journals Water entry of a body which moves in more than six degrees of freedom

2015 ◽  
Vol 471 (2177) ◽  
pp. 20150058 ◽  
Author(s):  
Y.-M. Scolan ◽  
A. A. Korobkin
Keyword(s):  
Degrees Of Freedom ◽  
Early Stage ◽  
Three Dimensional ◽  
Vertical Displacement ◽  
Oblique Impact ◽  
Water Entry ◽  
The Body ◽  
Body Motion ◽  
Elliptic Paraboloid ◽  
Over Time

The water entry of a three-dimensional smooth body into initially calm water is examined. The body can move freely in its 6 d.f. and may also change its shape over time. During the early stage of penetration, the shape of the body is approximated by a surface of double curvature and the radii of curvature may vary over time. Hydrodynamic loads are calculated by the Wagner theory. It is shown that the water entry problem with arbitrary kinematics of the body motion, can be reduced to the vertical entry problem with a modified vertical displacement of the body and an elliptic region of contact between the liquid and the body surface. Low pressure occurrence is determined; this occurrence can precede the appearance of cavitation effects. Hydrodynamic forces are analysed for a rigid ellipsoid entering the water with 3 d.f. Experimental results with an oblique impact of elliptic paraboloid confirm the theoretical findings. The theoretical developments are detailed in this paper, while an application of the model is described in electronic supplementary materials.

Scanning electron microscopy of freeze-fractured prescapular lymph node of caprine

1984 ◽  
Vol 42 ◽  
pp. 244-245
Author(s):  
O. Faroon ◽  
F. Al-Bagdadi ◽  
T. G. Snider ◽  
C. Titkemeyer
Keyword(s):  
Lymph Node ◽  
Lymph Nodes ◽  
Lymphatic System ◽  
Three Dimensional ◽  
Meat Products ◽  
The Body ◽  
Morphological Data ◽  
The World ◽  
Cellular Constituent ◽  
Scanning Electron

The lymphatic system is very important in the immunological activities of the body. Clinicians confirm the diagnosis of infectious diseases by palpating the involved cutaneous lymph node for changes in size, heat, and consistency. Clinical pathologists diagnose systemic diseases through biopsies of superficial lymph nodes. In many parts of the world the goat is considered as an important source of milk and meat products.The lymphatic system has been studied extensively. These studies lack precise information on the natural morphology of the lymph nodes and their vascular and cellular constituent. This is due to using improper technique for such studies. A few studies used the SEM, conducted by cutting the lymph node with a blade. The morphological data collected by this method are artificial and do not reflect the normal three dimensional surface of the examined area of the lymph node. SEM has been used to study the lymph vessels and lymph nodes of different animals. No information on the cutaneous lymph nodes of the goat has ever been collected using the scanning electron microscope.

Aspergillus Spondylodiscitis After Spinal Stenosis Surgery: A Case Report

2020 ◽  
Vol 5 (3 And 4) ◽  
pp. 155-160
Author(s):  
Mohsen Aghapoor ◽  
◽  
Babak Alijani Alijani ◽  
Mahsa Pakseresht-Mogharab ◽  
◽  
...  
Keyword(s):  
Antifungal Drugs ◽  
The Body ◽  
Lower Limbs ◽  
Lumbar Pain ◽  
Case Presentation ◽  
Delay In Diagnosis ◽  
Death Case ◽  
Therapeutic Results ◽  
History Of ◽  
Probable Diagnosis

Background and Importance: Spondylodiscitis is an inflammatory disease of the body of one or more vertebrae and intervertebral disc. The fungal etiology of this disease is rare, particularly in patients without immunodeficiency. Delay in diagnosis and treatment of this disease can lead to complications and even death. Case Presentation: A 63-year-old diabetic female patient, who had a history of spinal surgery and complaining radicular lumbar pain in both lower limbs with a probable diagnosis of spondylodiscitis, underwent partial L2 and complete L3 and L4 corpectomy and fusion. As a result of pathology from tissue biopsy specimen, Aspergillus fungi were observed. There was no evidence of immunodeficiency in the patient. The patient was treated with Itraconazole 100 mg twice a day for two months. Pain, neurological symptom, and laboratory tests improved. Conclusion: The debridement surgery coupled with antifungal drugs can lead to the best therapeutic results.

Sea Urchins and Circuses: The Modernist Natural Histories of Jean Painlevé and Alexander Calder

2018 ◽  
Vol 13 (2) ◽  
pp. 187-211
Author(s):  
Patricia E. Chu
Keyword(s):  
New Media ◽  
Sea Urchins ◽  
Life Sciences ◽  
Three Dimensional ◽  
Machine Age ◽  
Avant Garde ◽  
History Of ◽  
And Performance ◽  
The One ◽  
Natural Historian

The Paris avant-garde milieu from which both Cirque Calder/Calder's Circus and Painlevé’s early films emerged was a cultural intersection of art and the twentieth-century life sciences. In turning to the style of current scientific journals, the Paris surrealists can be understood as engaging the (life) sciences not simply as a provider of normative categories of materiality to be dismissed, but as a companion in apprehending the “reality” of a world beneath the surface just as real as the one visible to the naked eye. I will focus in this essay on two modernist practices in new media in the context of the history of the life sciences: Jean Painlevé’s (1902–1989) science films and Alexander Calder's (1898–1976) work in three-dimensional moving art and performance—the Circus. In analyzing Painlevé’s work, I discuss it as exemplary of a moment when life sciences and avant-garde technical methods and philosophies created each other rather than being classified as separate categories of epistemological work. In moving from Painlevé’s films to Alexander Calder's Circus, Painlevé’s cinematography remains at the forefront; I use his film of one of Calder's performances of the Circus, a collaboration the men had taken two decades to complete. Painlevé’s depiction allows us to see the elements of Calder's work that mark it as akin to Painlevé’s own interest in a modern experimental organicism as central to the so-called machine-age. Calder's work can be understood as similarly developing an avant-garde practice along the line between the bestiary of the natural historian and the bestiary of the modern life scientist.

Re-imagining Reproduction: Unsettling Metaphors in the History of Imperial Science and Commercial Surrogacy in India

Somatechnics ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 88-103 ◽  
Author(s):  
Kalindi Vora
Keyword(s):  
Assisted Reproductive Technologies ◽  
Reproductive Technologies ◽  
The Body ◽  
Body Parts ◽  
Colonial History ◽  
Women's Bodies ◽  
Commercial Surrogacy ◽  
Art Practices ◽  
History Of ◽  
Travel Industry

This paper provides an analysis of how cultural notions of the body and kinship conveyed through Western medical technologies and practices in Assisted Reproductive Technologies (ART) bring together India's colonial history and its economic development through outsourcing, globalisation and instrumentalised notions of the reproductive body in transnational commercial surrogacy. Essential to this industry is the concept of the disembodied uterus that has arisen in scientific and medical practice, which allows for the logic of the ‘gestational carrier’ as a functional role in ART practices, and therefore in transnational medical fertility travel to India. Highlighting the instrumentalisation of the uterus as an alienable component of a body and subject – and therefore of women's bodies in surrogacy – helps elucidate some of the material and political stakes that accompany the growth of the fertility travel industry in India, where histories of privilege and difference converge. I conclude that the metaphors we use to structure our understanding of bodies and body parts impact how we imagine appropriate roles for people and their bodies in ways that are still deeply entangled with imperial histories of science, and these histories shape the contemporary disparities found in access to medical and legal protections among participants in transnational surrogacy arrangements.

Receptions of the Past: Commemoration, Racism, Desire

Somatechnics ◽  
2017 ◽  
Vol 7 (2) ◽  
pp. 288-303
Author(s):  
Michael Connors Jackman
Keyword(s):  
Critical Point ◽  
Social Relations ◽  
White Privilege ◽  
Body Politic ◽  
The Body ◽  
Race And Racism ◽  
Lesbian And Gay ◽  
The Past ◽  
History Of

This article investigates the ways in which the work of The Body Politic (TBP), the first major lesbian and gay newspaper in Canada, comes to be commemorated in queer publics and how it figures in the memories of those who were involved in producing the paper. In revisiting a critical point in the history of TBP from 1985 when controversy erupted over race and racism within the editorial collective, this discussion considers the role of memory in the reproduction of whiteness and in the rupture of standard narratives about the past. As the controversy continues to haunt contemporary queer activism in Canada, the productive work of memory must be considered an essential aspect of how, when and for what reasons the work of TBP comes to be commemorated. By revisiting the events of 1985 and by sifting through interviews with individuals who contributed to the work of TBP, this article complicates the narrative of TBP as a bluntly racist endeavour whilst questioning the white privilege and racially-charged demands that undergird its commemoration. The work of producing and preserving queer history is a vital means of challenging the intentional and strategic erasure of queer existence, but those who engage in such efforts must remain attentive to the unequal terrain of social relations within which remembering forms its objects.

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