- Sir Victor Horsley's (1857-1916) memorial wall inscription at the Amarah War Cemetery. [Journal Article]
- JHJ Hist Neurosci 2019 Apr 30; :1-2
- Experimental Investigation of Quantum Decay at Short, Intermediate, and Long Times via Integrated Photonics. [Journal Article]
- PRPhys Rev Lett 2019 Apr 05; 122(13):130401
- The decay of an unstable system is usually described by an exponential law. Quantum mechanics predicts strong deviations of the survival probability from the exponential: Indeed, the decay is initial…
The decay of an unstable system is usually described by an exponential law. Quantum mechanics predicts strong deviations of the survival probability from the exponential: Indeed, the decay is initially quadratic, while at very large times it follows a power law, with superimposed oscillations. The latter regime is particularly elusive and difficult to observe. Here we employ arrays of single-mode optical waveguides, fabricated by femtosecond laser direct inscription, to implement quantum systems where a discrete state is coupled and can decay into a continuum. The optical modes correspond to distinct quantum states of the photon, and the temporal evolution of the quantum system is mapped into the spatial propagation coordinate. By injecting coherent light states in the fabricated photonic structures and by measuring a small scattered fraction of such light with an unprecedented dynamic range, we are able to experimentally observe not only the exponential decay regime, but also the quadratic Zeno region and the power-law decay at long evolution times.
- "Towards eliminating viral hepatitis": Examining the productive capacity and constitutive effects of global policy on hepatitis C elimination. [Journal Article]
- IJInt J Drug Policy 2019 Apr 08
- In 2016 the World Health Organization published the first global health strategy to address viral hepatitis, setting a goal of eliminating viral hepatitis as a major public health threat by 2030. Whi…
In 2016 the World Health Organization published the first global health strategy to address viral hepatitis, setting a goal of eliminating viral hepatitis as a major public health threat by 2030. While the field has been motivated by this goal, to date there has been little critical attention paid to the productive capacity and constitutive effects of this policy. How is governing taking place through the mechanism of this global strategy, and how are its goals and targets shaping what is made thinkable (indeed, what is made as the real) about hepatitis C and its elimination? And with what effects? Taking the Global Health Sector Strategy on Viral Hepatitis, 2016-2021 as a text for analysis, we draw on poststructural thinking on problematisation and governmental technologies to examine how 'elimination' - as a proposal - constitutes the problem of hepatitis C. We critically consider the conceptual logics underpinning the elimination goal and targets, and the multiple material-discursive effects of this policy. We examine how governing takes place through numbers, by analysing 'target-setting' (and its accompanying practices of management, quantification and surveillance) as governmental technologies. We consider how the goal of elimination makes viral hepatitis visible and amenable to structuring, action and global management. Central to making viral hepatitis visible and manageable is quantification. Viral hepatitis is made as a problem requiring urgent global health management not through the representation of its effects on bodies or situated communities but rather through centralising inscription practices and comparison of estimated rates. It is important to remain alert to the multiple makings of hepatitis C and draw attention to effects which might be obscured due to a primary focus on quantification and management. To do so is to recognise the ontopolitical effects of governmental technologies, especially for communities 'targeted' by these strategies (including people who inject drugs).
- Confinement templates for hierarchical nanoparticle alignment prepared by azobenzene-based surface relief gratings. [Journal Article]
- SMSoft Matter 2019 May 15; 15(19):3872-3878
- Alignment of nanoparticles to hierarchical periodic structures is an emerging field in the development of patterned surfaces. Common alignment methods are based on templates that guide particle self-…
Alignment of nanoparticles to hierarchical periodic structures is an emerging field in the development of patterned surfaces. Common alignment methods are based on templates that guide particle self-assembly. These can be formed using lithographic methods offering an almost free choice of the motif, while being expensive and time-consuming for large-scale production. Alternatively, template formation by controlled wrinkling offers a low-cost formation, but often suffers from the formation of defect structures like line-defects and cracks. Here, we show a preparation technique for nanoparticle alignment substrates that is based on the inscription of holographic surface relief gratings with a periodic sinusoidal wave pattern on the surface of azobenzene films. As interference patterns are employed for structure formation, very uniform and defect-free gratings with tunable grating height and grating period can be prepared. These substrates were successfully replicated to poly(dimethyl siloxane) and the replicas used for the alignment of polystyrene latex particles. Accordingly produced substrates exhibiting gratings with a variation in grating height allow for efficient screening of nanoparticle alignment in a geometrical confinement in one single experiment. We anticipate our studies as a promising tool for the development of sensors, tunable gratings and metamaterials.
- Polymer Optical Fiber Bragg Gratings in CYTOP Fibers for Angle Measurement with Dynamic Compensation. [Journal Article]
- PPolymers (Basel) 2018 Jun 17; 10(6)
- This paper demonstrates the use of polymer optical fiber Bragg gratings (POFBGs) for angle measurements over a range of different oscillatory frequencies. The POFBGs are inscribed in low-loss, cyclic…
This paper demonstrates the use of polymer optical fiber Bragg gratings (POFBGs) for angle measurements over a range of different oscillatory frequencies. The POFBGs are inscribed in low-loss, cyclic transparent amorphous fluoropolymers (CYTOP) and are imprinted using the direct-write, plane-by-plane femtosecond laser inscription method. As the polymer has a viscoelastic response and given that the Young's modulus depends on the oscillatory frequency, a compensation technique for sensor frequency cross-sensitivity and hysteresis is proposed and verified. Results show that the proposed compensation technique is able to provide a root mean squared error (RMSE) reduction of 44%, and a RMSE as low as 2.20° was obtained when compared with a reference potentiometer. The hysteresis reduction provided by the proposed technique is 55%, with hysteresis <0.01. The results presented in this paper can pave the way for movement analysis with POFBG providing higher sensitivity and low hysteresis over a large range of motion frequencies.
- Low-cost high integration IR polymer microlens array. [Journal Article]
- OLOpt Lett 2019 Apr 01; 44(7):1600-1602
- In this Letter, a low-cost refractive convex microlens array device based on infrared a polymer is fabricated by a nanoimprinting technique. The device integrates more than 4000 microlenslets within …
In this Letter, a low-cost refractive convex microlens array device based on infrared a polymer is fabricated by a nanoimprinting technique. The device integrates more than 4000 microlenslets within a footprint of 10 mm×10 mm. The surface quality, spectral transmittance, imaging resolution, and surface damage threshold of the device have been fully characterized. The IR imaging and parallel laser inscription experiments confirm the remarkable optical performance of the fabricated device. Owing to the merits of high optical quality, low fluence lose, and simple fabrication, this device is promising in cutting-edge IR applications, such as IR imaging, laser fabrication, and so on.
- Ultrafast laser-induced nanogratings in sodium germanate glasses. [Journal Article]
- OLOpt Lett 2019 Apr 01; 44(7):1564-1567
- We report ultrafast laser inscription of nanogratings possessing form birefringence in binary sodium germanate glasses in a wide range of Na2O content from 3 to 22 mol.%. A minimal number of laser pu…
We report ultrafast laser inscription of nanogratings possessing form birefringence in binary sodium germanate glasses in a wide range of Na2O content from 3 to 22 mol.%. A minimal number of laser pulses required to induce noticeable form birefringence is shown to grow exponentially with Na2O content in glass. Atomic force microscopy showed similarity of their periodical structure and period value to those in the nanogratings formed in fused silica. A sharp pulse duration threshold below which laser pulses do not induce nanogratings in the studied glasses has been revealed. Formation of a nanograting in 22Na2O·78GeO2 at the studied conditions is accompanied by crystallization of a surrounding submicron layer and partial crystallization inside the nanograting with precipitation of Na2Ge4O9 crystals.
- [Management of microcytic anemia]. [Journal Article]
- RPRev Prat 2018; 68(7):e288
- [Iron pathology in adults and children]. [Journal Article]
- RPRev Prat 2018; 68(7):e283-e287
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- Laser Inscription of Microfluidic Devices for Biological Assays. [Journal Article]
- AAACS Appl Mater Interfaces 2019 Apr 03; 11(13):12253-12260
- A rapid and direct CO2 laser ablation method was developed to create superhydrophilic surfaces and arrays of hydrophobic-superhydrophilic patterns for application in bioassays. Here, a combination of…
A rapid and direct CO2 laser ablation method was developed to create superhydrophilic surfaces and arrays of hydrophobic-superhydrophilic patterns for application in bioassays. Here, a combination of superhydrophilic and hemiwicking wetting characteristics was exploited to create microfluidic slides that were used as biological assays that prevented cell aggregation. This feature allowed microscopic analyses to be carried out at the individual cell level. This bioassay enabled control of cell population in localized areas (15 cells cm-2). The device had 84% transparency, allowing direct fluorescence microscopy measurements in transmission mode. High adhesion of aqueous fluids on superhydrophilic areas surrounded by superhydrophobic boundaries provided selective retention and confinement. The adhered droplets maintained retention under 180° substrate tilt. These architectures provided rapid self-partitioning of the liquid into an array of droplets. The hydrophobic-superhydrophilic patterned arrays may have applications in microfluidic bioassays, high-throughput screening, and medical diagnostics.