Surface Tension, Screen Space

2020 ◽  
Author(s):  
Giuliana Bruno
Keyword(s):  
Surface Tension ◽  
Surface Condition ◽  
A Site ◽  
Screen Space ◽  
Film And Video ◽  
Screen Surface

My work questions how material relations can appear on the surface of different media—on film and video screens, in gallery installations, or on the skins of buildings and people. In response to these issues, I propose to approach materiality as a surface condition. Focusing on screen surface, I show that technologies of light can produce new forms of materiality. In this text, the screen emerges as a site of encounter and admixture. Various experiments of screening are considered, ranging from those envisaged by László Moholy-Nagy to the contemporary installations of Krzysztof Wodiczko. In these configurations of the act of screening, different forms of mediation, memory, and transformation can take place. This is what I call ‘the surface tension of media’.

scholarly journals Experimental study of the wake behind a surface-piercing cylinder for a clean and contaminated free surface

2000 ◽  
Vol 402 ◽  
pp. 109-136 ◽  
Author(s):  
AMY WARNCKE LANG ◽  
MORTEZA GHARIB
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Turbulent Flows ◽  
Cross Sections ◽  
Surface Deformation ◽  
Surface Condition ◽  
Free Surface Flows ◽  
Shear Stresses ◽  
Surface Contaminants ◽  
A New Technique

This experimental investigation into the nature of free-surface flows was to study the effects of surfactants on the wake of a surface-piercing cylinder. A better understanding of the process of vorticity generation and conversion at a free surface due to the absence or presence of surfactants has been gained. Surfactants, or surface contaminants, have the tendency to reduce the surface tension proportionally to the respective concentration at the free surface. Thus when surfactant concentration varies across a free surface, surface tension gradients occur and this results in shear stresses, thus altering the boundary condition at the free surface. A low Reynolds number wake behind a surface-piercing cylinder was chosen as the field of study, using digital particle image velocimetry (DPIV) to map the velocity and vorticity field for three orthogonal cross-sections of the flow. Reynolds numbers ranged from 350 to 460 and the Froude number was kept below 1.0. In addition, a new technique was used to simultaneously map the free surface deformation. Shadowgraph imaging of the free surface was also used to gain a better understanding of the flow. It was found that, depending on the surface condition, the connection of the shedding vortex filaments in the wake of the cylinder was greatly altered with the propensity for surface tension gradients to redirect the vorticity near the free surface to that of the surface-parallel component. This result has an impact on the understanding of turbulent flows in the vicinity of a free surface with varying surface conditions.

Study Concerning the Improvement of Biphasic Contact of the Coloumns with Structured Packing

2008 ◽  
Vol 59 (1) ◽  
pp. 65-69
Author(s):  
Andra Tamas ◽  
Nadia Pop ◽  
Zeno Gropsian
Keyword(s):  
Surface Tension ◽  
Direct Effect ◽  
Contact Surface ◽  
Surface Condition ◽  
Separation Process ◽  
Structured Packing ◽  
Packing Element ◽  
Materials Used ◽  
Packing Efficiency ◽  
Experimental Values

In this paper is being studied the behaviour of structured packing subjected to certain chemical, thermal or electrochemical treatments, in specified conditions (temperature and exposure time). The wettability of the materials used has a direct effect on the liquid layer, being influenced by the density, viscosity and surface tension of the liquid as well as the surface condition, which has allowed the comparison of the thickness experimental values with those determined analytically. The treatments applied had in view the possibility of improving or regenerating the packing efficiency as a result of the changes that occur on the contact surface. The characterization was done after each treatment. Also, it was established the number of equilibrium stages related to one packing element used in the separation process.

The surface tension of liquid aluminium in high vacuum: The role of surface condition

2007 ◽  
Vol 27 (5) ◽  
pp. 394-401 ◽  
Author(s):  
J.M. Molina ◽  
R. Voytovych ◽  
E. Louis ◽  
N. Eustathopoulos
Keyword(s):  
Surface Tension ◽  
Surface Condition ◽  
High Vacuum ◽  
Liquid Aluminium

Effect of surface tension and surfactant administration on Eustachian tube mechanics

2002 ◽  
Vol 93 (3) ◽  
pp. 1007-1014 ◽  
Author(s):  
Samir N. Ghadiali ◽  
Julie Banks ◽  
J. Douglas Swarts
Keyword(s):  
Mechanical Properties ◽  
Surface Tension ◽  
Eustachian Tube ◽  
Middle Ear ◽  
Surface Condition ◽  
Normal Mucosa ◽  
Experimental Manipulation ◽  
Middle Ear Pressure ◽  
The Right ◽  
Effect Of Surface

Development of otitis media has been related to abnormal Eustachian tube (ET) mechanics. ET is a collapsible tube that is periodically opened to regulate middle ear pressure and to clear middle ear fluid into the nasopharynx. The ability to perform these physiological functions depends on several mechanical properties, including the ET's opening pressure (Popen), compliance (ETC), and hysteresis (η). In this study, a previously developed modified force-response protocol was used to determine ET mechanical properties after experimental manipulation of the mucosal surface condition. Specifically, these properties were measured in the right ear of six cynomologous monkeys under baseline conditions after “washing out” the normal ET mucous layer and after instillation of a pulmonary surfactant, Infasurf. Removal of the normal mucosa did not significantly alter Popen but did result in a decrease in ETC and η ( P < 0.05). Treatment of the mucosa with Infasurf was effective in reducing Popen and increasing both ETC and η to baseline values ( P < 0.05). These results indicate that the mucosa-air surface tension can affect the overall ETC and η properties of the ET. In addition, this study indicates that surfactant therapy may only be beneficial in patients with rigid or inelastic ETs (large Popen and low ETC and η).

scholarly journals Experimental Correlation for Splashing Condition of Droplets on Solid Substrates

Fluids ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 38
Author(s):  
Yukihiro Yonemoto ◽  
Kanta Tashiro ◽  
Minori Yamashita ◽  
Tomoaki Kunugi
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Surface Roughness ◽  
Surface Condition ◽  
Reynolds Numbers ◽  
Solid Surfaces ◽  
Ohnesorge Number ◽  
Capillary Length ◽  
Solid Substrates ◽  
Experimental Correlation

Droplet splashing behaviors of water-ethanol binary mixture liquids on roughened solid surfaces were experimentally observed in order to investigate the effects of surface tension, viscosity, and wettability/surface roughness on the splashing occurrence. The range of the droplet volumes was from 1.7 μL to 32.6 μL. The ranges of the surface tension and the viscosity were from 21.1 mN/m to 71.9 mN/m, and from 1 mPas to 2.91 mPas, respectively. The surface roughness range was from 0.03 μm to 1.25 μm for Ra. The present experimental data were evaluated on the basis of the existing models. Resulting from these experiments, a simple model using the Ohnesorge number evaluated by the capillary length was proposed and the accuracy of the predicted critical values such as the critical Weber and Reynolds numbers were discussed. The result indicated that the liquid properties and the quantification of the surface condition such as surface roughness are important factors for the prediction of the splashing behavior.

scholarly journals Cosmopolitical technologies and the demarcation of screen space at Cine Kurumin

Media-N ◽  
2018 ◽  
Vol 14 (1) ◽  
pp. 11-23
Author(s):  
Sarah Shamash
Keyword(s):  
Indigenous Women ◽  
Women Filmmakers ◽  
Film Festival ◽  
Roundtable Discussion ◽  
Nature And Culture ◽  
Production Processes ◽  
Screen Space ◽  
Constituent Elements ◽  
Film And Video ◽  
Made In

“Our fight today is to demarcate our space on the screen, when we can no longer demarcate our lands.” I cite Ailton Krenak, one of Brazil’s most influential Indigenous leaders, at his keynote address at the opening of the Cine Kurumin film festival in Salvador, Brazil, to engage with cinematic languages on the margins of dominant media. I experience the festival as an active immersion into imaginaries that forward the process of “decoloniality” (Mignolo). As Sueli Maxakali articulated during a roundtable of Indigenous women filmmakers, the Shaman must dream in order to choose the name of the films made in her community. The production processes of these films were conceived outside the structures of any capitalist market economy; rather, the festival offered an alternate space to take a deliberate leap into expressive audio and oral visual experiences, cultures, languages, politics, and imaginaries resisting ongoing violence entrenched in capital and coloniality. Through a discussion of the festival curation, roundtable discussion, and through a film analysis, I elaborate how the sacred, spiritual, and social are constituent elements of cosmopolitical visions. I argue that film and video as cosmopolitical technologies are unsettling established conceptions of nature and culture, of politics and representation both on and off-screen. Witnessing the Cine Kurumin festival – the totality of the experience becomes an immersive and transformative space for decolonizing the imaginary while disturbing hegemonic political, conceptual, and representational agendas.

scholarly journals Film and Media as a Site for Memory in Contemporary Art

2017 ◽  
Vol 14 (1) ◽  
pp. 157-173
Author(s):  
Domingo Martinez Rosario
Keyword(s):  
Contemporary Art ◽  
Cultural Memory ◽  
Media Art ◽  
The Past ◽  
Multi Media ◽  
A Site ◽  
The Relationship ◽  
Film And Video ◽  
With Memory

Abstract This article explores the relationship between film, contemporary art and cultural memory. It aims to set out an overview of the use of film and media in artworks dealing with memory, history and the past. In recent decades, film and media projections have become some of the most common mediums employed in art installations, multi-screen artworks, sculptures, multi-media art, as well as many other forms of contemporary art. In order to examine the links between film, contemporary art and memory, I will firstly take a brief look at cultural memory and, secondly, I will set out an overview of some pieces of art that utilize film and video to elucidate historical and mnemonic accounts. Thirdly, I will consider the specific features and challenges of film and media that make them an effective repository in art to represent memory. I will consider the work of artists like Tacita Dean, Krzysztof Wodiczko and Jane and Louise Wilson, whose art is heavily influenced and inspired by concepts of memory, history, nostalgia and melancholy. These artists provide examples of the use of film in art, and they have established contemporary art as a site for memory.

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