113 research outputs found
Investigation of passive flow control techniques to enhance the stall characteristics of a microlight aircraft
This report investigates the enhancement of aerodynamic stall characteristics of a Skyranger microlight aircraft by the use of passive flow control techniques, namely vortex generators and turbulators. Each flow control device is designed and scaled to application conditions. Force balance measurements and surface oil flow visualisation are carried out on a half-model of the microlight to further investigate the nature of the flow on the aircraft with and without the flow control devices. The results indicate a clear advantage to the use of turbulators compared with vortex generators. Turbulators increased the maximum lift coefficient by 2.8%, delayed the onset of stall by increasing the critical angle by 17.6% and reduced the drag penalty at both lower (pre-stall) and higher angles of attack by 8% compared to vortex generators. With vortex generators applied, the results indicated a delayed stall with an increase in the critical angle by 2% and a reduced drag penalty at higher angles of attack
Subcortical cytoskeleton periodicity throughout the nervous system
Superresolution fluorescence microscopy recently revealed a ~190ânm periodic cytoskeleton lattice consisting of actin, spectrin, and other proteins underneath the membrane of cultured hippocampal neurons. Whether the periodic cytoskeleton lattice is a structural feature of all neurons and how it is modified when axons are ensheathed by myelin forming glial cells is not known. Here, STED nanoscopy is used to demonstrate that this structure is a commonplace of virtually all neuron types in vitro. To check how the subcortical meshwork is modified during myelination, we studied sciatic nerve fibers from adult mice. Periodicity of both actin and spectrin was uncovered at the internodes, indicating no substantial differences between unmyelinated and myelinated axons. Remarkably, the actin/spectrin pattern was also detected in glial cells such as cultured oligodendrocyte precursor cells. Altogether our work shows that the periodic subcortical cytoskeletal meshwork is a fundamental characteristic of cells in the nervous system and is not a distinctive feature of neurons, as previously thought
Brief Amici Curiae Legal Scholars of Sex and Gender In Support of Plaintiff-Appellant
This amicus brief was filed in Griffith v. El Paso County, Colorado, case no. 23-1135 (10th Circuit) in support of appellant Darlene Griffith. Amici curiae are legal scholars of sex and gender. They offerexpertise in their personal capacities to assist the Court of Appeals for the Tenth Circuit in assessing whether the El Paso County Sheriff officials violated Ms. Griffithâs Fourteenth Amendment right to equal protection when they refused to house Ms. Griffith, a transgender woman, in the women\u27s unit of the El Paso County Jail as a pretrial detainee
Measurement of turbulent spatial structure and kinetic energy spectrum by exact temporal-to-spatial mapping
Multichannel read-out for arrays of metallic magnetic calorimeters
Metallic magnetic micro-calorimeters (MMCs) operated at millikelvin
temperature offer the possibility to achieve eV-scale energy resolution with
high stopping power for X-rays and massive particles in an energy range up to
several tens of keV. This motivates their use in a wide range of applications
in fields as particle physics, atomic and molecular physics. Present detector
systems consist of MMC arrays read out by 32 two-stage SQUID read-out channels.
In contrast to the design of the detector array and consequently the design of
the front-end SQUIDs, which need to be optimised for the physics case and the
particles to be detected in a given experiment, the read-out chain can be
standardised. We present our new standardised 32-channel parallel read-out for
the operation of MMC arrays to be operated in a dilution refrigerator. The
read-out system consists of a detector module, whose design depends on the
particular application, an amplifier module, ribbon cables from room
temperature to the millikelvin platform and a data acquisition system. In
particular, we describe the realisation of the read-out system prepared for the
ECHo-1k experiment for the operation of two 64-pixel arrays. The same read-out
concept is also used for the maXs detector systems, developed for the study of
the de-excitation of highly charged heavy ions by X-rays, as well as for the
MOCCA system, developed for the energy and position sensitive detection of
neutral molecular fragments for the study of fragmentation when molecular ions
recombine with electrons. The choice of standard modular components for the
operation of 32-channel MMC arrays offer the flexibility to upgrade detector
modules without the need of any changes in the read-out system and the
possibility to individually exchange parts in case of damages or failures
Flow analysis of vortex generators on wing sections by stereoscopic particle image velocimetry measurements
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