Microcontact and Macrocontact Angles and the Drop Stability on a Bare Surface

2004 ◽  
Vol 108 (50) ◽  
pp. 19339-19347 ◽  
Author(s):  
Gersh O. Berim ◽  
Eli Ruckenstein
Keyword(s):  
Drop Stability ◽  
Bare Surface

scholarly journals Immersed boundary simulation of drop stability

2021 ◽  
Vol 1740 ◽  
pp. 012026
Author(s):  
Maria Guskova ◽  
Lev Shchur
Keyword(s):  
Immersed Boundary ◽  
Drop Stability

An Experimental Study on Cryogenic Spray Quenching of a Circular Metal Disk II. Chilldown Efficiency and Effects of Coating and Flow Pulsing

2021 ◽  
Author(s):  
Jun Dong ◽  
Hao Wang ◽  
Samuel Darr ◽  
Jason Hartwig ◽  
Jacob Chung
Keyword(s):  
Heat Transfer ◽  
Mass Flow Rate ◽  
Liquid Nitrogen ◽  
Mass Flow ◽  
Flow Rate ◽  
Continuous Flow ◽  
Nucleate Boiling ◽  
Film Boiling ◽  
Teflon Coating ◽  
Bare Surface

Abstract This is the second part of a two-part series that presents the results of liquid nitrogen spray quenching of a Stainless Steel disc. The results of continuous-flow spray chilldown of a bare surface disc are summarized first that serves as the baseline information for evaluating the effects of disc surface coating and pulse flow. We found that for continuous-flow spray chilldown of a bare surface disc, the chilldown efficiency is mainly a function of the average mass flow rate with the trend of decreasing efficiency with increasing mass flow rate. Additional experiments were performed to evaluate the enhancement of cryogenic spray quenching by three techniques: 1. Using intermittent pulse sprays on SS bare surface, 2. Coating the SS surface with a layer of low thermal conductivity Teflon film, and 3. Spraying liquid nitrogen intermittently on the coated SS surface. In general, the results indicate that all three methods effectively produced higher spray thermal efficiencies and reduced liquid nitrogen mass consumption. However, it was also found that the Teflon coating was more effective than the flow pulsing due to that the Teflon coating induced a large surface temperature drop at the beginning of the chilldown that allowed the quenching to move quickly from poor heat transfer film boiling to efficient heat transfer transition and nucleate boiling regimes. This quick transition shortens the film boiling period, thus facilitates the switch to much higher heat transfer transition boiling and nucleate boiling periods earlier to complete the chilldown process faster.

New PGE Modified Electrode Comprising Ni NPs/1,5-Diphenylcarbazide Film Capable for Analyzing Oxytocin

2020 ◽  
Vol 18 (11) ◽  
pp. 793-800
Author(s):  
Mahsa JaFari-Pouyani ◽  
Samineh Kaki ◽  
Arash Babakhanian
Keyword(s):  
Cyclic Voltammetry ◽  
Linear Response ◽  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Nano Particles ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Microscopy Techniques ◽  
Bare Surface ◽  
Human Blood Serum Sample

This study focuses on the compatibility of square wave voltammetry technique with new modified graphite pencil electrode to quantify Oxytocin. Ni-Nano particles and 1,5-diphenylcarbazide modifiers were quickly electro-deposited by cyclic voltammetry sweeping technique on the bare surface of a graphite pencil electrode. The electrochemical and morphological assessments were accomplished with cyclic voltammetry, square wave voltammetry and scanning electron microscopy techniques. The proposed electrochemical sensor revealed a good electro catalytic response to Oxytocin concerning the parameters α = 0.42, log Ks =3.44 and Γ = 8.72×10−10 in the optimized pH of 4 and the working potential of about 0.35 V. The new sensor also exhibited a linear response to Oxytocin over the concentration range of 125 to 350 nmolL−1 with the limit of detection of 41.53 nmolL−1. Moreover, the applicability of the proposed sensor was successfully examined and it became usable to determine Oxytocin accurately and precisely in real samples such as human blood serum sample without any serious side interference.

scholarly journals Synthetic aperture radar (SAR)-based mapping of volcanic flows: Manam Island, Papua New Guinea

2004 ◽  
Vol 4 (2) ◽  
pp. 339-346 ◽  
Author(s):  
J. K. Weissel ◽  
K. R. Czuchlewski ◽  
Y. Kim
Keyword(s):  
Synthetic Aperture Radar ◽  
Papua New Guinea ◽  
Forest Cover ◽  
New Guinea ◽  
Pyroclastic Flows ◽  
Synthetic Aperture ◽  
Global Volcanism ◽  
L Band ◽  
Bare Surface ◽  
Aperture Radar

Abstract. We present new radar-based techniques for efficient identification of surface changes generated by lava and pyroclastic flows, and apply these to the 1996 eruption of Manam Volcano, Papua New Guinea. Polarimetric L- and P-band airborne synthetic aperture radar (SAR) data, along with a C-band DEM, were acquired over the volcano on 17 November 1996 during a major eruption sequence. The L-band data are analyzed for dominant scattering mechanisms on a per pixel basis using radar target decomposition techniques. A classification method is presented, and when applied to the L-band polarimetry, it readily distinguishes bare surfaces from forest cover over Manam volcano. In particular, the classification scheme identifies a post-1992 lava flow in NE Valley of Manam Island as a mainly bare surface and the underlying 1992 flow units as mainly vegetated surfaces. The Smithsonian's Global Volcanism Network reports allow us to speculate whether the bare surface is a flow dating from October or November in the early part of the late-1996 eruption sequence. This work shows that fully polarimetric SAR is sensitive to scattering mechanism changes caused by volcanic resurfacing processes such as lava and pyroclastic flows. By extension, this technique should also prove useful in mapping debris flows, ash deposits and volcanic landslides associated with major eruptions.

Comparative in situ ROS mediated killing of bacteria with bulk analogue, Eucalyptus leaf extract (ELE)-capped and bare surface copper oxide nanoparticles

2019 ◽  
Vol 100 ◽  
pp. 747-758 ◽  
Author(s):  
Khursheed Ali ◽  
Bilal Ahmed ◽  
Sabiha M. Ansari ◽  
Quaiser Saquib ◽  
Abdulaziz A. Al-Khedhairy ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Leaf Extract ◽  
Copper Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Bare Surface

Effect of soil management, pH, and fertilizers on Packham's Triumph and Josephine de Malines pears

1970 ◽  
Vol 10 (43) ◽  
pp. 218
Author(s):  
A Selimi ◽  
JC Keatley
Keyword(s):  
Soil Management ◽  
Management Systems ◽  
Potassium Sulphate ◽  
Lower Yield ◽  
Straw Mulch ◽  
Post Trial ◽  
Bare Surface ◽  
Tree Vigour ◽  
Better Than ◽  
Similar Yield

The effects of soil management, liming (soil pH), and fertilizers on Packham's Triumph and Josephine de Malines pears under irrigation conditions were studied. The management systems were cultivation, straw mulch, bare surface, and white clover sward. The fertilizers were phosphorus and nitrogen (on straw mulch only), potash and nitrogen (on bare surface only), nitrogen on clover sward only, and calcium as agricultural lime and nitrogen (on cultivation only). Treatment effects were expressed as yield or vigour differences between pre-trial and post-trial periods. Packham's gave similar yield of fruit whether on cultivation or straw mulch. The yield from clover sward and bare surface was much lower than from straw mulch trees. Tree vigour was best under straw mulch and similar within the other treatments. For Josephine, all treatments yielded equally, but tree vigour was best under straw mulch plots. Packham's under bare surface and receiving the highest dressing of potassium sulphate yielded better than the unfertilized trees. Josephine under straw mulch and receiving the highest dressing of superphosphate yielded better than unfertilized trees. Under clover sward, Packham's receiving no artificial nitrogen had lower yield than those receiving standard dressing of nitrogen (0.7 metric tons per hectare of ammonium sulphate). Under these conditions, there were no differences in the yield of Josephines, whether they had artificial nitrogen or not. Packham's under cultivation had similar yield at pH 5.0, 6.5, or 7.5. Josephines, however, yielded much better at pH 6.5 and 7.5 than at pH 5.0.

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