scholarly journals A Magnetically Actuated Superhydrophobic Ratchet Surface for Droplet Manipulation

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 325
Author(s):  
ChangHee Son ◽  
BingQiang Ji ◽  
JunKyu Park ◽  
Jie Feng ◽  
Seok Kim
Keyword(s):  
Pressure Gradient ◽  
Water Droplet ◽  
Laplace Pressure ◽  
Black Silicon ◽  
Magnetically Actuated ◽  
Fabrication Procedure ◽  
Asymmetric Shape ◽  
Droplet Manipulation ◽  
The Impact ◽  
Two Sides

A water droplet dispensed on a superhydrophobic ratchet surface is formed into an asymmetric shape, which creates a Laplace pressure gradient due to the contact angle difference between two sides. This work presents a magnetically actuated superhydrophobic ratchet surface composed of nanostructured black silicon strips on elastomer ridges. Uniformly magnetized NdFeB layers sputtered under the black silicon strips enable an external magnetic field to tilt the black silicon strips and form a superhydrophobic ratchet surface. Due to the dynamically controllable Laplace pressure gradient, a water droplet on the reported ratchet surface experiences different forces on two sides, which are explored in this work. Here, the detailed fabrication procedure and the related magnetomechanical model are provided. In addition, the resultant asymmetric spreading of a water droplet is studied. Finally, droplet impact characteristics are investigated in three different behaviors of deposition, rebound, and penetration depending on the impact speed. The findings in this work are exploitable for further droplet manipulation studies based on a dynamically controllable superhydrophobic ratchet surface.

Diplomacy and life on Georgia's boundary line

2011 ◽  
Vol 22 (4) ◽  
pp. 357-371
Author(s):  
Caecilia J. van Peski
Keyword(s):  
Humanitarian Assistance ◽  
Boundary Line ◽  
South Ossetia ◽  
The Future ◽  
Major Incidents ◽  
Unstable Environment ◽  
Personal Wellbeing ◽  
To Come ◽  
The Impact ◽  
Two Sides

AbstractOn the third anniversary of the war over South Ossetia, resumed talks between Georgia and Russia are needed to create positive momentum in a still unstable environment. The article examines the continuing strains and recommends that the two sides engage in direct dialogue in order to de-escalate allegations about the other's involvement in the conflict. While formal diplomatic relations remain more or less suspended, many mutual interests remain. Paramount in this is the fact that Georgia and Russia share interests in improving mutual security, trade and transport. The impact of the ongoing conflict on Georgia's very diverse communities differs substantially, as do their priorities. Concerns over the future amongst these communities are widespread. The consequences of the violence and subsequent failure to progress resolution of the conflict still affect communities, especially those living along the Administrative Boundary Line between South Ossetia and Georgia proper. Although no major incidents of violence have occurred since 2008 and the level of humanitarian assistance provided to communities around the ABL has been impressive during the first two years following the war, the contact and movement across the ABL has become increasingly difficult, badly affecting those dependent on cross-border interaction for their personal wellbeing and that of their communities. As a result, a range of vulnerabilities is more likely to come to the surface and undermine the future sustainability of communities living along the ABL. As such, it is essential that local and international actors, including OSCE and EUMM are better able to distinguish between the varied needs of communities living along the ABL , in order to develop appropriate strategies for responding to them.

scholarly journals Practice Merariq On Society The Sasak In Lombok Regency West Gerung

2018 ◽  
pp. 166-178
Author(s):  
Rosdiana Rosdiana ◽  
Arman Arman ◽  
Andi Multazam
Keyword(s):  
Qualitative Research ◽  
Local Community ◽  
Type A ◽  
Young Age ◽  
Early Marriage ◽  
Registered User ◽  
Age Of Marriage ◽  
The Guardian ◽  
The Impact ◽  
Two Sides

Sasak language Merariq is a verb that is generally meant as a unity of action pre-wedding begins with the escape of girls (the prospective wife) from the supervision of the guardian and simultaneously serve as a procession of early marriage. There are various interpretations in interpret merariq, some interpret it as the process of escape (with the consent of both partners), there are also interpreted as an act of stealing, Sasak language called memaling a girl from the supervision of the person her parents. This research aims to examine and analyze information in depth about the custom merarik. Type a descriptive qualitative research. The results of this research are sasak community interpret merarik as the event of theft of the girl from the parental controls either with the consent or without the consent of a parent or guardian. Most sasak communities do merarik because it has become a tradition of the local community. In this case, Islam does not forbid the practice of merarik origin against corresponding to phases as well as the actual procedure. As for the impact caused is one of them raise the age of marriage of young age. If women get married at a young age a lot once a given impact due to unpreparedness both physical and psychic, in addition, merarik very vulnerable creates a conflict between the two sides if there is one party that is not a registered user agreement. It is hoped this research can contribute to the prevention of marriage due to the young age of merarik. As well as the necessity of granting of socialization to society Sasak about how the nature of the custom merarik is actually so no more self-contradictory the associated practice of merarik.

Large-Area Fabrication of Superhydrophobic Micro-Conical Pillar Arrays on Various Metallic Substrates

Nanoscale ◽  
2021 ◽  
Author(s):  
Weihao Pan ◽  
Song Wu ◽  
Liu Huang ◽  
Jinlong Song
Keyword(s):  
Corrosion Resistance ◽  
Water Droplet ◽  
Large Area ◽  
Water Separation ◽  
Metallic Substrates ◽  
Pillar Arrays ◽  
Oil Water Separation ◽  
Oil Water ◽  
Droplet Manipulation ◽  
Application Prospects

Superhydrophobic micro-conical pillar arrays have huge application prospects, from anti-icing to oil/water separation, corrosion resistance, and water droplet manipulation. However, there is still a lack of versatile methods with high...

Social Media

2019 ◽  
pp. 47-68
Author(s):  
Elham Mohammadi ◽  
Azam Masoumi
Keyword(s):  
Mental Health ◽  
Social Media ◽  
Human Interaction ◽  
Face To Face ◽  
The Impact ◽  
Two Sides ◽  
Modern Technologies

This chapter examines the path of human interaction by using modern technologies. There are two sides: those in favor of using modern technologies and those who argue that modern technologies have unwanted, detrimental effects on people's lives and health. This chapter explores virtual communication's properties. It focuses on the impact that using social media instead of face-to-face interaction has on the users' health, specifically mental health. In this viewpoint, social media is not an alternative to face-to-face interaction but a complementary device that reminds us the vitality of interaction even with those who are physically unavailable to us.

Understand Journalists

2021 ◽  
pp. 264-276
Author(s):  
Dennis Meredith
Keyword(s):  
Professional Science ◽  
The Impact ◽  
Two Sides

Journalists and scientists share such traits as curiosity and a search for the truth, but they also differ. While a scientist is not concerned with the impact their research has, journalists do and come in a bora spectrum, from totally inexperienced to professional science writers. However, both types work for their readers and viewers, not scientists; like to tell great stories; prefer conclusions to caveats; and work in a professional pressure cooker. They concentrate on covering papers published in journals, even though that research is tentative. Few journalists can do “enterprise reporting,” in which they cover the uncertainties, contradictions, controversies, and complexities of a topic. While they care about accuracy, they are not schooled in statistics. They also emphasize positive discoveries, rather than null findings, and they may engage in “false balance,” covering two sides of a story, even though one is invalid. They need a news peg, work on tight deadlines, and like visuals and multimedia to enhance their stories.

scholarly journals Optimization of bioinspired triangular patterns for water condensation and transport

2019 ◽  
Vol 377 (2150) ◽  
pp. 20190127 ◽  
Author(s):  
Dong Song ◽  
Bharat Bhushan
Keyword(s):  
Relative Humidity ◽  
Pressure Gradient ◽  
Surface Temperature ◽  
Dew Point ◽  
Laplace Pressure ◽  
Theme Issue ◽  
Water Condensation ◽  
Water Collection ◽  
Condensed Water ◽  
Droplet Condensation

Water condenses on a surface in ambient environment if the surface temperature is below the dew point. For water collection, droplets should be transported to storage before the condensed water evaporates. In this study, Laplace pressure gradient inspired by conical spines of cactus plants is used to facilitate the transport of water condensed in a triangular pattern to the storage. Droplet condensation, transportation and water collection rate within the bioinspired hydrophilic triangular patterns with various lengths and included angles, surrounded by superhydrophobic regions, were explored. The effect of relative humidity was also explored. This bioinspired technique can be used to develop efficient water collection systems. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology (part 2)’.

scholarly journals Bioinspired triangular patterns for water collection from fog

2019 ◽  
Vol 377 (2150) ◽  
pp. 20190128 ◽  
Author(s):  
Dong Song ◽  
Bharat Bhushan
Keyword(s):  
Pressure Gradient ◽  
Science And Technology ◽  
Laplace Pressure ◽  
Theme Issue ◽  
Droplet Motion ◽  
Triangular Shape ◽  
Conical Shape ◽  
Bioinspired Materials ◽  
Water Collection ◽  
Curvature Gradient

Cacti use spines with conical geometry to transport water to its base. A conical shape with curvature gradient generates a Laplace pressure gradient along the droplet, which is responsible for droplet motion. In this study, the triangular shape was used which also generates a Laplace pressure gradient along the droplet. A bioinspired surface, composed of a hydrophilic triangular pattern surrounded by a rim of superhydrophobic region, was used to transport water collected from the fog on the hydrophilic pattern. The growing droplets start to coalesce into bigger ones. Eventually, they are big enough to touch the superhydrophobic borders, which trigger the transport motion. Droplet mobility and water collection measurements were made on triangular patterns with various geometries to determine the most efficient configurations. Results from this study can be used to enhance the performance of water collection systems from fog. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology (part 2)’.

Blade coating analysis of viscous nanofluid having Cu–water nanoparticles using flexible blade coater

2020 ◽  
Vol 36 (4) ◽  
pp. 348-367 ◽  
Author(s):  
Marya Kanwal ◽  
Xinhua Wang ◽  
Hasan Shahzad ◽  
Yingchun Chen ◽  
Hui Chai
Keyword(s):  
Pressure Gradient ◽  
Shooting Method ◽  
Volume Fraction ◽  
Volumetric Flow Rate ◽  
Lubrication Approximation ◽  
Nanoparticle Volume Fraction ◽  
Porous Substrate ◽  
Flow Equations ◽  
The Impact ◽  
Blade Coating

This article presents the blade coating analysis of viscous nanofluid passing over a porous substrate using a flexible blade coater. Water-based copper nanoparticles are considered to discuss the blade coating process. The lubrication approximation theory is applied to develop the flow equations. The analytical solution is obtained for velocity, volumetric flow rate, and pressure gradient, while shooting method is applied to obtain the pressure, thickness, and load. Different models for dynamic viscosity have been applied to observe the impact of related parameters on pressure, pressure gradient, and velocity. These results are presented graphically. Interesting engineering quantities such as load, deflection, and thickness are computed numerically and are shown in the tabulated form. It is found that nanoparticle volume fraction increases the pressure gradient, pressure and has minor effects on velocity. For model 1, an increase in the volume fraction reduces the coating thickness, load, and deflection, while model 2 has opposite effects on the mentioned quantities. Also, model 2 has a greater impact on pressure and pressure gradient when compared to model 1.

scholarly journals Group-Induced Extremization: Review of Evidence and a Minority-Change Explanation

1973 ◽  
Vol 33 (2) ◽  
pp. 471-484 ◽  
Author(s):  
Helmut Lamm ◽  
Gisela Trommsdorff ◽  
Edith Rost-Schaude
Keyword(s):  
Small Group ◽  
Group Discussion ◽  
Study Finding ◽  
Group Functioning ◽  
Special Distribution ◽  
Group Members ◽  
The Impact ◽  
Two Sides

A review of evidence from a number of experiments suggests that as a result of discussion the average of the group members' positions (attitudes, judgments) becomes more extreme. These shifts seem to occur primarily when group members' initial positions are distributed across the two sides of the scale in such a way as to create a majority-minority constellation. Accordingly, it is proposed that underlying the extremity-shifts reported in the literature is the movement of a minority toward the majority's side. That such minority-change is nor the only source of extremization is suggested by one study finding that group discussion enhances the extremity of individual positions. An analysis of the special distribution of positions existing on the items selected in that experiment permits the following conclusion. Discussion-induced extremization is (also) caused by the impact of arguments in the discussion favoring the side which most or all members preferred to begin with. Other explanations cannot be discarded at the present time. At the least they point to important aspects of small-group functioning which it would seem fruitful to investigate.

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