352 research outputs found
Assembling convolution neural networks for automatic viewing transformation
Images taken under different camera poses are
rotated or distorted, which leads to poor perception experiences.
This paper proposes a new framework to automatically transform
the images to the conformable view setting by assembling
different convolution neural networks. Specifically, a referential
3D ground plane is firstly derived from the RGB image and
a novel projection mapping algorithm is developed to achieve
automatic viewing transformation. Extensive experimental results
demonstrate that the proposed method outperforms the state-ofthe-art vanishing points based methods by a large margin in
terms of accuracy and robustness
Manipulating and Dispensing Micro/Nanoliter Droplets by Superhydrophobic Needle Nozzles
There is rapidly increasing research interest focused on manipulating and dispensing tiny droplets in nanotechnology and biotechnology. A micro/nanostructured superhydrophobic nozzle surface is one promising candidate for the realization of tiny droplet manipulating applications. Here, we explore the feasibility of using superhydrophobicity for guided dispensing of tiny water droplets. A facile dip-coating method is developed to prepare superhydrophobic needle nozzles (SNNs) based on commercial needle nozzles with reduced inner diameter. The SNNs can manipulate tiny droplets of different volumes by only changing the inner diameter of the nozzle, rather than reducing the nozzle size as a whole. Different from the previous electric-field-directed process or pyroelectrodynamic-driven technique, quasi-stable water drops down to the picoliter scale can be produced by SNNs without employing any extra driving mechanisms. Due to their intrinsic superhydrophobic nature, the SNNs also possess the properties of reducing sample liquid retention, improving sample volume transfer accuracy, and saving expensive reagents. In addition, this kind of dip-coating method can also be applied to micropipet tips, inkjet or bio-printer heads, <i>etc</i>. As the issues of reducing drop size and increasing drop volume accuracy are quite important in the laboratory and industry, this facile but effective superhydrophobic nozzle-coating method for manipulating tiny droplets could be of great help to make breakthroughs in next-generation liquid transport and biometric and inkjet printing devices
Smartly Aligning Nanowires by a Stretching Strategy and Their Application As Encoded Sensors
The nanotechnology world is being more and more attracted toward high aspect ratio one-dimensional nanostructures due to their potentials as building blocks for electronic/optical devices. Here, we propose a novel method to generate nanowire patterns with assistance of superhydrophobic flexible polydimethylsiloxane (PDMS) substrates. Micropillar gaps are tunable <i>via</i> a stretching process of the PDMS surface; thus, diverse nanowire patterns can be formed by stretching the same PDMS surface in various ways. Importantly, square nanowire loops with alternative compositions can be generated through a double-stretching process, showing an advanced methodology in controlling the alignment of nanowires. Since alternative fluorescent molecules will be quenched by diverse chemical substances, this alternative nanowire loop shows a selective detection for diverse target compounds, which greatly improves the application of this nanowire patterning approach. Furthermore, such alternative nanowire patterns can be transferred from pillar-structured surfaces to flat films, indicating further potentials in microcircuits, sensitive sensors, and other organic functional nanodevices
Spatial distributions of the standard deviation in the global SST anomaly time series during the time 1870β2009.
<p>Spatial distributions of the standard deviation in the global SST anomaly time series during the time 1870β2009.</p
Multiphase Media Antiadhesive Coatings: Hierarchical Self-Assembled Porous Materials Generated Using Breath Figure Patterns
The
cleaning of interface pollutants typically consumes a large
amount of energy. Therefore, the development of multiphase media antiadhesive
materials is urgently required to meet the demand of energy savings
and environmental protection. In this study, the antiadhesive properties
toward several liquid droplets and bubbles in multiple media are demonstrated
on a porous Fe<sub>2</sub>O<sub>3</sub> coating, which is prepared <i>via</i> a facile spin-coating-assisted breath figure approach
and a phase separation strategy. The prominent antiadhesive characteristic
of these porous surfaces lies in their high-surface-energy hierarchical
micro/nanoscale structure, which easily entraps one medium (oil or
water) in the pore and repels other unmixable liquids and air bubbles.
In addition, we successfully demonstrate an antifouling application
of the coating, which shows excellent antiadhesive and super-antiwetting
characteristics under multiple liquids. Our work extends relevant
antiadhesion research from a single medium to multiple media and promises
to broaden the applications of antiadhesive materials in sophisticated
activities performed under complicated liquid environments, such as
marine antifouling or pipeline transportation
The geographical distributions of the index <i>Ο</i>.
<p>The geographical distributions of the index <i>Ο</i>.</p
Manipulating and Dispensing Micro/Nanoliter Droplets by Superhydrophobic Needle Nozzles
There is rapidly increasing research interest focused on manipulating and dispensing tiny droplets in nanotechnology and biotechnology. A micro/nanostructured superhydrophobic nozzle surface is one promising candidate for the realization of tiny droplet manipulating applications. Here, we explore the feasibility of using superhydrophobicity for guided dispensing of tiny water droplets. A facile dip-coating method is developed to prepare superhydrophobic needle nozzles (SNNs) based on commercial needle nozzles with reduced inner diameter. The SNNs can manipulate tiny droplets of different volumes by only changing the inner diameter of the nozzle, rather than reducing the nozzle size as a whole. Different from the previous electric-field-directed process or pyroelectrodynamic-driven technique, quasi-stable water drops down to the picoliter scale can be produced by SNNs without employing any extra driving mechanisms. Due to their intrinsic superhydrophobic nature, the SNNs also possess the properties of reducing sample liquid retention, improving sample volume transfer accuracy, and saving expensive reagents. In addition, this kind of dip-coating method can also be applied to micropipet tips, inkjet or bio-printer heads, <i>etc</i>. As the issues of reducing drop size and increasing drop volume accuracy are quite important in the laboratory and industry, this facile but effective superhydrophobic nozzle-coating method for manipulating tiny droplets could be of great help to make breakthroughs in next-generation liquid transport and biometric and inkjet printing devices
Spatial distributions of the scaling exponents in the global SST anomaly time series during the time 1870β2009 employing DFA2.
<p>Spatial distributions of the scaling exponents in the global SST anomaly time series during the time 1870β2009 employing DFA2.</p
Interactions of Hyaluronan Layers with Similarly Charged Surfaces: The Effect of Divalent Cations
We
used colloidal probe atomic force microscopy to measure the
normal forces between the surface of a silica colloidal particle and
a sparse layer of hyaluronan (hyaluronic acid, HA, MW β 10<sup>6</sup> Da) covalently attached to a planar silica surface, both
across pure water and following the addition of 1 mM MgCl<sub>2</sub>. It was found that in the absence of salt the HA layer repelled
the colloidal silica surface during both approach and retraction.
The addition of the MgCl<sub>2</sub>, however, changes the net force
between the negatively charged HA layer and the opposing negatively
charged silica surface from repulsion to adhesion. This interaction
reversal is attributed to the bridging effect of the added Mg<sup>2+</sup> ions. Our results provide first direct force data to support
earlier simulation and predictions that such divalent cations could
bridge between negative charges on opposing surfaces, leading to an
overall reversal of force from repulsion to attraction
Log-log plots of power-law relationship between the detrended variability <i>F</i>(<i>s</i>) and the time scale <i>s</i> in the global zones, southern hemisphere, north hemisphere, the middle latitude zones, and the tropics (solid squares for the SST series (annual cycles are removed) using DFA2 and red solid lines for the records represent linear fit of SST fluctuations).
<p>Log-log plots of power-law relationship between the detrended variability <i>F</i>(<i>s</i>) and the time scale <i>s</i> in the global zones, southern hemisphere, north hemisphere, the middle latitude zones, and the tropics (solid squares for the SST series (annual cycles are removed) using DFA2 and red solid lines for the records represent linear fit of SST fluctuations).</p
- β¦