scholarly journals Surface Tension-Based Ultra-Micro Precision Dispensing Method For Micro-Scale Manufacturing

2020 ◽  
Author(s):  
Liu Hui Fang. ◽  
Qiao Kai qing ◽  
Gao Quan Xiang ◽  
Xu Hao Tian
Keyword(s):  
Surface Tension ◽  
Rapid Development ◽  
Adhesive Force ◽  
Droplet Volume ◽  
Micro Manufacturing ◽  
Precise Control ◽  
Micro Assembly ◽  
Position Accuracy ◽  
Droplet Trajectory ◽  
Pass Through

Abstract Due to the rapid development of precision micro-manufacturing technology, it has made higher requirements for micro-connection and micro-assembly technologies. An ultra-micro-dispensing method based on the surface tension of the droplets is proposed, which can be realized on the surface of micro-components. Distribute the glue between pl. Use a pipette to pass through the capillary containing the glue, cover the tip of the pipette with glue, and then form tiny glue droplets under the action of the glue's own adhesive force and surface tension. In the experiment, the factors such as the diameter of the pipette, the speed of movement, the Cap value, and the viscosity of the glue were analyzed in detail.Fly upgrade ultra-small dispensing was achieved.The minimum glue droplet was 22.4 μm, and the droplet volume was 228 fL. The planning of the glue droplet trajectory, different plane graphics composed of uniform fl glue droplets, this method achieves precise control of the size and position accuracy of the glue droplets, the deviation of the glue spot diameter is within 2.2 μm, and the deviation of the glue droplet position is 1.58 μm Inside.

An old friend is better than two new ones? Approaches to market research in the context of digital transformation for the antitrust laws enforcement

2020 ◽  
pp. 37-55 ◽  
Author(s):  
A. E. Shastitko ◽  
O. A. Markova
Keyword(s):  
Business Models ◽  
Rapid Development ◽  
Digital Transformation ◽  
Market Definition ◽  
Type I ◽  
Type Ii ◽  
Digital Platforms ◽  
Advantages And Disadvantages ◽  
Pass Through ◽  
Type Ii Errors

Digital transformation has led to changes in business models of traditional players in the existing markets. What is more, new entrants and new markets appeared, in particular platforms and multisided markets. The emergence and rapid development of platforms are caused primarily by the existence of so called indirect network externalities. Regarding to this, a question arises of whether the existing instruments of competition law enforcement and market analysis are still relevant when analyzing markets with digital platforms? This paper aims at discussing advantages and disadvantages of using various tools to define markets with platforms. In particular, we define the features of the SSNIP test when being applyed to markets with platforms. Furthermore, we analyze adjustment in tests for platform market definition in terms of possible type I and type II errors. All in all, it turns out that to reduce the likelihood of type I and type II errors while applying market definition technique to markets with platforms one should consider the type of platform analyzed: transaction platforms without pass-through and non-transaction matching platforms should be tackled as players in a multisided market, whereas non-transaction platforms should be analyzed as players in several interrelated markets. However, if the platform is allowed to adjust prices, there emerges additional challenge that the regulator and companies may manipulate the results of SSNIP test by applying different models of competition.

Effect of Resin on the Property of the Fluorescent Inkjet Ink

2011 ◽  
Vol 287-290 ◽  
pp. 49-53
Author(s):  
Shao Hong Gao ◽  
Xian Fu Wei ◽  
Bei Qing Huang
Keyword(s):  
Surface Tension ◽  
Technology Development ◽  
Great Influence ◽  
Adhesive Force ◽  
Short Wave ◽  
Luminous Intensity ◽  
Digital Printing ◽  
Significant Implication ◽  
Green Fluorescent ◽  
Inkjet Digital Printing

Digital printing ink imaging is one of main technical fields in digital printing technology development, fluorescence inkjet digital printing is provided with favorable anti-falsification, which is used widely in Securities anti-counterfeiting and labels anti-counterfeiting etc[1]. Printings coated with fluorescence inkjet ink that emits fluorescence under using short-wave ultraviolet light excitation get more favorable anti-falsification. Green fluorescent inkjet ink is composed of phosphor, resin, solvent, assistant agent etc, resin is main one of green fluorescent inkjet ink, which has a significant implication for its property. In order to discuss resins to green fluorescent inkjet ink properties, five samples of fluorescent inkjet ink are prepared, and test various performance parameters of ink samples, such as luminous intensity, surface tension, adhesive force, aridity, and so on. The study result indicated that resins have a great influence on luminous intensity, surface tension, aridity of fluorescence inkjet ink samples, surface tension and viscosity of resins immediately impact surface tension and viscosity of fluorescent inkjet ink.

Non-Intrusive Technique for Measuring Instability Wave Amplitudes at Simplex Swirl Atomizer Exit

2006 ◽  
Author(s):  
Viktor L. Orekhov ◽  
Mahesh V. Panchagnula
Keyword(s):  
Canola Oil ◽  
Wave Amplitude ◽  
Cone Angle ◽  
Instability Wave ◽  
Instability Waves ◽  
Precise Control ◽  
Pressure Cone ◽  
Pass Through ◽  
Swirl Atomizer ◽  
Burner Nozzle

An optical method for non-intrusive wave amplitude measurement is examined. An experimental setup was constructed to produce sprays of various fluids including Canola oil and glycerin-water mixtures, such that precise control of pressure up to 140 psi was possible. A spray was produced by a 20 Gallon per hour oil burner nozzle at varying pressures. Initially, a smooth laminar conical sheet was noticed which eventually was found to break up into droplets. A laser was passed through the laminar conical sheet and was projected onto a surface on the other side and resulted in a vertical linear projection. This projection is postulated to be formed due to the scanning motion of the laser beam as instability waves pass through the laser. The angle of this scan was found to be a function of pressure, cone angle, and distance of laser from nozzle. High resolution images were taken of the film profile as well as the projected image and image analysis software was used to calculate cone angles and angular scan of the laser. Tests were performed with Canola Oil as well as a mixture of glycerin and water in order to evaluate the effect of viscosity and surface tension on the measurements. The resulting data was used to illustrate a principle for determining the instability wave amplitude using this technique.

Preparation and Characterization of a Novel Hydrogel-Based Fouling Release Coating

2017 ◽  
Vol 898 ◽  
pp. 1539-1544
Author(s):  
Lin Liu ◽  
Zi Jie Li ◽  
Sen Sun ◽  
Ting You ◽  
Xiao Tong Qi ◽  
...  
Keyword(s):  
Surface Tension ◽  
Rapid Development ◽  
Salt Spray ◽  
Immersion Test ◽  
Salt Spray Test ◽  
Transportation Industry ◽  
Water Contact ◽  
Marine System ◽  
Fouling Release

With the rapid development of marine transportation industry, biological fouling not only affects the speed of navigation but also highly increases fuel consumption. In the paper, a novel hydrogel-based fouling release coating is developed to address the issue by a combination of non-stick property with a low surface tension of the coating. A hydrogel-based silicone fouling release coating was synthesized and two kinds of different intermediate coatings were studied to give a proper match as the tie layer between the substrate coated with primer and the hydrogel silicone on the surface. The adhesion strength, surface tension as well as surface topography of the fouling release coating were studied. The corrosion resistance and anti-fouling performance of the substrates sprayed with the coating were characterized by salt spray test and immersion test in a simulated marine system. The results show that the adhesion between the substrate and the fouling release coating is grade two measured by grid test. The water contact angle of the coating is 104.8o and Rz of the coating is 10.71μm. The specimen is intact after 1000 hours under salt spray test. No diatom was found settled on the specimens in a simulated static marine system while a little diatom was observed on the specimens in a simulated dynamic marine system. It has been found that the intermediate coating comprising of epoxy resin gives proper match between the primer and the fouling release coating consisting of PDMS resin. The coating exhibits superior anti-fouling performance under stationary state.

scholarly journals VISUALIZATION AND ANALYSIS OF CELLULAR & TWITTER DATA USING QGIS

2018 ◽  
Vol XLII-4/W8 ◽  
pp. 199-209
Author(s):  
B. Sowkhya ◽  
S. Amaduzzi ◽  
D. Raawal
Keyword(s):  
Social Life ◽  
Rapid Development ◽  
Mitigation Strategies ◽  
Data Accessibility ◽  
Hazard Management ◽  
Twitter Data ◽  
Human Movements ◽  
To Come ◽  
Pass Through ◽  
Repeat Visits

<p><strong>Abstract.</strong> The study is to understand individual presence and movement in Friuli Venezia Giulia region. It is important for tourism planning, hazard management, business marketing, implementing government lifetime policies and benefit. The aim of this study is achieved by advanced web<span class="thinspace"></span>2.0 applications. We need real time and geo-located data to monitor the inflow of tourist and to come up with effective promoting and benefiting plans for tourism, the evacuation and mitigation strategies during hazards to protect social life and environment with less infrastructure damage, marketing plans for advertising or selling of products. Despite wide spread success in predicting specific aspects of human behavior by social media information, a little attention is given to twitter and cell phone data. Accessibility to detailed human movements with fine spatial and temporal granularity is challenging due to confidentiality and safety reasons. With rapid development of web<span class="thinspace"></span>2.0 applications people can post about events, share opinion and emotions online. Using twitter data, how short term travelers, such as tourists, can be recognized and how their travel pattern can be analyzed. Study of finding tourist dynamics such as arriving and outgoing of tourist, sum of trips, sum of days and night spent, number of unique visitors, country of residence, main destination, secondary destination, transits pass through, repeat visits are achieved using CDR (call detail records) and DDR (data detail records).</p>

Satellite formation during bubble transition through an interface between immiscible liquids

2014 ◽  
Vol 744 ◽  
Author(s):  
E. Q. Li ◽  
S. A. Al-Otaibi ◽  
I. U. Vakarelski ◽  
S. T. Thoroddsen
Keyword(s):  
Surface Tension ◽  
Time Scales ◽  
High Speed ◽  
Triple Line ◽  
Capillary Waves ◽  
Immiscible Liquids ◽  
Low Viscosity ◽  
Lower Viscosity ◽  
Power Law Exponent ◽  
Pass Through

AbstractWhen a bubble rises to an interface between two immiscible liquids, it can pass through the interface, if this is energetically favourable, i.e. the bubble preferring the side of the interface with the lower air–liquid surface tension. Once the intermediate film between the bubble and the interface has drained sufficiently, the bubble makes contact with the interface, forming a triple-line and producing strong capillary waves which travel around the bubble and can pinch off a satellite on the opposite side, akin to the dynamics in the coalescence cascade. We identify the critical Ohnesorge numbers where such satellites are produced and characterize their sizes. The total transition time scales with the bubble size and differential surface tension, while the satellite pinch-off time scales with the capillary-inertial time of the pool liquid, which originally surrounds the bubble. We also use high-speed video imaging to study the motion of the neck of the contact. For low viscosity we show that it grows in time with a power-law exponent between 0.44 and 0.50, with a prefactor modified by the net sum of the three interfacial tensions. Increasing the viscosity of the receiving liquid drop drastically slows down the motion of the triple-line, when the Ohnesorge number exceeds ${\sim }$0.08. This differs qualitatively from the coalescence of two miscible drops of different viscosities, where the lower viscosity sets the coalescence speed. We thereby propose a strong resistance from the triple-line.

Studies on Beetles of the Family Ptinidae. VI.—The Biology of Ptinus fur (L.) and P. sexpunctatus Panzer

1951 ◽  
Vol 42 (3) ◽  
pp. 499-511 ◽  
Author(s):  
R. W. Howe ◽  
H. D. Burges
Keyword(s):  
Rapid Development ◽  
Maximum Temperature ◽  
Continuous Series ◽  
Optimum Temperature ◽  
Emergence Period ◽  
Mature Adults ◽  
Large Numbers ◽  
The Family ◽  
The Mean ◽  
Pass Through

The development of Ptinus fur (L.) and P. sexpunctatus Panzer at 70 per cent. R.H. and several temperatures has been studied.The optimum temperature for rapid development of P. fur is about 23°C., at which temperature it completes its development in a mean period of 132·1 days on fishmeal. For P. sexpunctatus the optimum temperature for rapid development is slightly below 30°C., development being completed in approximately 111 days on wheatfeed at this temperature.Eggs of P. sexpunctatus, but not those of P. fur, hatch at 30°C., which is near the maximum temperature for development of P. fur.Larvae of P. fur normally moult three times at 23°C. on fishmeal, but some have an extra moult.Well defined diapause as mature larvae in cocoons occurs at low temperatures in some individuals of P. fur ; at 23°C. this lasts about 220 days after normal larvae have pupated ; the period at 20°C. is about 280 days. Diapause at this stage also occurs in P. sexpunctatus. In experiments, the development periods of the diapausing and non-diapausing larvae overlapped to form a continuous series.Some P. sexpunctatus pass through a period of quiescence as mature adults in cocoons ; at 23°C., this lasted 43·5 days on fishmeal and 103·0 days on wheatfeed (mean periods). In P. fur the pre-emergence period is 30 to 60 days, considerably longer than that of other warehouse Ptinids studied.Of the foods, wheatfeed allows the quickest development for both species, but fishmeal produces the heaviest beetles.The adult beetles live for several months. They require food and drinking water. Egg output is small, the mean number of eggs laid per female at 25°C. being 38·6 for P. fur and 21·3 for P. sexpunctatus.P. sexpunctatus was able to overwinter in an unheated outbuilding and could possibly become a pest on some foods.P. fur is unlikely to occur in large numbers, owing to its long development period, small egg output and tendency to larval diapause.

Hydrophobic property of hierarchical polymer surfaces fabricated by precision tooling machine

2014 ◽  
Vol 34 (5) ◽  
pp. 477-482 ◽  
Author(s):  
Donghui Chu ◽  
Akihiro Nemoto ◽  
Hiroshi Ito
Keyword(s):  
Low Cost ◽  
Hierarchical Structures ◽  
Polymer Surfaces ◽  
Process Time ◽  
Hydrophobic Property ◽  
Micro Manufacturing ◽  
Manufacturing Method ◽  
Precise Control ◽  
Direct Fabrication ◽  
Manufacturing Techniques

Abstract Poly(methylmethacrylate) surfaces were patterned with micropillars and micro-micro hierarchical structures. Patterning was achieved by applying direct fabrication on polymer surfaces. The micro-manufacturing method has many advantages of precise control of dimensions, low cost, and short process time compared to other micro-manufacturing techniques of polymers. Fabricated structures were controlled accurately to <10% of the error range. Patterned micro-micro hierarchical polymer structures indicated a contact angle >130° without additional coatings. Furthermore, fabricated structures show good durability in terms of contamination and mechanical robustness for 2 months.

Sign in / Sign up

Export Citation Format

Share Document