58 research outputs found
Two Gallium data sets, spin flavour precession and KamLAND
We reexamine the possibility of a time modulation of the low energy solar
neutrino flux which is suggested by the average decrease of the Ga data in line
with our previous arguments. We perform two separate fits to the solar neutrino
data, one corresponding to 'high' and the other to 'low' Ga data, associated
with low and high solar activity respectively. We therefore consider an
alternative to the conventional solar+KamLAND fitting, which allows one to
explore the much wider range of the angle permitted by the
KamLAND fitting alone. We find a solution with parameters in which the 'high' and
the 'low' Ga rates lie far apart and are close to their central values and is
of comparable quality to the global best fit, where these rates lie much closer
to each other. This is an indication that the best fit in which all solar and
KamLAND data are used is not a good measure of the separation of the two Ga
data sets, as the information from the low energy neutrino modulation is
dissimulated in the wealth of data. Furthermore for the parameter set proposed
one obtains an equally good fit to the KamLAND energy spectrum and an even
better fit than the 'conventional' LMA one for the reactor antineutrino
survival probability as measured by KamLAND.Comment: V2: 15 pages, 3 eps figures, fit improved, final version to appear in
Journal of Physics
Identifying upper limb disability in patients with persistent whiplash
Background: Patients with persistent whiplash associated disorders (WAD) report upper limb (UL) symptoms and functional difficulties but there is limited information regarding the nature of these complaints. Impairments in motor performance may relate to functional deficits
Calling EPA’s Bluff: State Produced Water Recycling Regulation as a Case Study in Technological Innovation Through Uncooperative Federalism
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Optimising aerosol jet printing of collagen inks for enhanced piezoelectricity and controlled surface potential
Abstract
Collagen is a highly versatile protein used in tissue engineering constructs and as a model piezoelectric biomaterial. The piezoelectricity of collagen can be enhanced through the alignment of collagen domains and fibres, although most fabrication techniques used to form dense collagenous constructs do not allow for significant collagen alignment. The use of aerosol jet printing (AJP) mitigates the limitations of using soluble collagen inks for bioprinting or extrusion-based 3D printing, particularly if microfibrillar collagen suspensions are used as a cost-effective and scalable ink source. In this work, Type I and Type II microfibrillar collagen from different anatomical sources were successfully deposited using aerosol jet printing with two different atomisation methods, namely pneumatic (p-AJP) and ultrasonic (u-AJP). The printing parameters were optimised for their piezoelectric amplitude and surface potential. Fourier Transform Infrared (FTIR) spectra of the films revealed that ultrasonic atomisation did not cause significant denaturation of collagen, although the process resulted in the fractionation and preferential deposition of the oligomeric and gelatinous components within the slurry. The printed collagen samples displayed a piezoelectric response that was 4 times higher than the values obtained from drop-cast collagen films, and their surface potential was found to be positively correlated to the roughness of the films which can be controlled through the mode of atomisation. These results indicate the ability to enhance and control the piezoelectricity and surface potential using p-AJP and u-AJP, which offers a promising physical modulation technique to tailor cell adhesion, proliferation or differentiation for collagen-based tissue engineering constructs.This work was supported by the Royal Society of Chemistry Research Enablement Grant E20-8065.
MN additionally acknowledges funding from Emmanuel College. LI acknowledges funding from an EP-SC Doctoral Training Partnership Studentship (EP/R513180/1). KRMS was funded by the Peter and Carol Thrower Fund (Downing College). SK-N acknowledges support from the EPSRC Centre of Advanced Materials for Integrated Energy Systems "CAM-IES" (grant EP/P007767/1), and from the European Research Council (ERC) through a Starting Grant (ERC-2011-STG-639526, NANOGEN
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Research data supporting 'Optimising aerosol jet printing of collagen inks for enhanced piezoelectricity and controlled surface potential'
This is the research dataset supporting 'Optimising aerosol jet printing of collagen inks for enhanced piezoelectricity and controlled surface potential.' A csv file is provided containing all the data of interest in the 'Median' Channel. Values are provided for Line width, Kelvin Probe Force Microscopy Channels, Piezoforce Response Microscopy Channels. Roughness deriving from Tapping mode AFM. Rheology data and figures are provided in a zip file
Shareholder Proposal Right in Public Corporations in China's Transitional Economy: From the Perspective of Shareholder Activism
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