Refine
Year of publication
- 2021 (34) (remove)
Institute
Document Type
- Article (26)
- Conference Proceeding (4)
- Report (2)
- Part of a Book (1)
- Other (1)
Keywords
- AlterG (1)
- Bacillus sp (1)
- Biosolubilization (1)
- Bone quality and biomechanics (1)
- CellDrum (1)
- Coefficient of ocular rigidity (1)
- Corneo-scleral shell (1)
- DLR-ESTEC GOSSAMER roadmap for solar sailing (1)
- Differential tonometry (1)
- EEG (1)
- Environmental impact (1)
- Eyeball (1)
- GOSSAMER-1 (1)
- Glaucoma (1)
- Impedance Spectroscopy (1)
- LPS (1)
- Muscle Fascicle (1)
- Muscle Force (1)
- Neuromuskuläres System (1)
- Ocular blood flow (1)
- Pressure-volume relationship (1)
- RVA (1)
- Rehabilitationsmedizin (1)
- Rehabilitatives Training (1)
- Robotik (1)
- Septic cardiomyopathy (1)
- Simulation (1)
- Skeletal muscle (1)
- Sleep EEG (1)
- Small Aral Sea (1)
- Small spacecraft (1)
- Solar sail (1)
- Stiffness (1)
- Tendon Rupture (1)
- Tendons (1)
- Trainingsgerät (1)
- Ultrasound (1)
- Vascular response (1)
- Visual field asymmetry (1)
- actin cytoskeleton (1)
- biopotential electrodes (1)
- cardiomyocyte biomechanics (1)
- constructive alignment (1)
- crop yield (1)
- drop jump (1)
- ecological structure (1)
- examination (1)
- gait (1)
- humic acid (1)
- hyper-gravity (1)
- hypo-gravity (1)
- intraclass correlation coefficient (1)
- lignite (1)
- locomotion (1)
- long-term retention (1)
- low-rank coal (1)
- metagenomics (1)
- microbial diversity (1)
- multimodal (1)
- muscle fascicle behavior (1)
- muscle mechanics (1)
- parabolic flight (1)
- practical learning (1)
- rehabilitation (1)
- running (1)
- sarcomere operating length (1)
- sensors (1)
- series elastic element behavior (1)
- shotgun sequencing (1)
- shoulder (1)
- soil amendment (1)
- soil health (1)
- soil remediation (1)
- sprint start (1)
- standard error of measurement (1)
- stretch reflex (1)
- test-retest reliability (1)
- ultrasonography (1)
- ultrasound imaging (1)
- unloading (1)
- walking (1)
Is part of the Bibliography
- no (34)
Delayed cerebral ischemia (DCI) is a common complication after aneurysmal subarachnoid hemorrhage (aSAH) and can lead to infarction and poor clinical outcome. The underlying mechanisms are still incompletely understood, but animal models indicate that vasoactive metabolites and inflammatory cytokines produced within the subarachnoid space may progressively impair and partially invert neurovascular coupling (NVC) in the brain. Because cerebral and retinal microvasculature are governed by comparable regulatory mechanisms and may be connected by perivascular pathways, retinal vascular changes are increasingly recognized as a potential surrogate for altered NVC in the brain. Here, we used non-invasive retinal vessel analysis (RVA) to assess microvascular function in aSAH patients at different times after the ictus.
With the increased interest for interstellar exploration after the discovery of exoplanets and the proposal by Breakthrough Starshot, this paper investigates the optimisation of photon-sail trajectories in Alpha Centauri. The prime objective is to find the optimal steering strategy for a photonic sail to get captured around one of the stars after a minimum-time transfer from Earth. By extending the idea of the Breakthrough Starshot project with a deceleration phase upon arrival, the mission’s scientific yield will be increased. As a secondary objective, transfer trajectories between the stars and orbit-raising manoeuvres to explore the habitable zones of the stars are investigated. All trajectories are optimised for minimum time of flight using the trajectory optimisation software InTrance. Depending on the sail technology, interstellar travel times of 77.6-18,790 years can be achieved, which presents an average improvement of 30% with respect to previous work. Still, significant technological development is required to reach and be captured in the Alpha-Centauri system in less than a century. Therefore, a fly-through mission arguably remains the only option for a first exploratory mission to Alpha Centauri, but the enticing results obtained in this work provide perspective for future long-residence missions to our closest neighbouring star system.
Contractile behavior of the gastrocnemius medialis muscle during running in simulated hypogravity
(2021)
Vigorous exercise countermeasures in microgravity can largely attenuate muscular degeneration, albeit the extent of applied loading is key for the extent of muscle wasting. Running on the International Space Station is usually performed with maximum loads of 70% body weight (0.7 g). However, it has not been investigated how the reduced musculoskeletal loading affects muscle and series elastic element dynamics, and thereby force and power generation. Therefore, this study examined the effects of running on the vertical treadmill facility, a ground-based analog, at simulated 0.7 g on gastrocnemius medialis contractile behavior. The results reveal that fascicle−series elastic element behavior differs between simulated hypogravity and 1 g running. Whilst shorter peak series elastic element lengths at simulated 0.7 g appear to be the result of lower muscular and gravitational forces acting on it, increased fascicle lengths and decreased velocities could not be anticipated, but may inform the development of optimized running training in hypogravity. However, whether the alterations in contractile behavior precipitate musculoskeletal degeneration warrants further study.
Geochemical characterisation of hypersaline waters is difficult as high concentrations of salts hinder the analysis of constituents at low concentrations, such as trace metals, and the collection of samples for trace metal analysis in natural waters can be easily contaminated. This is particularly the case if samples are collected by non-conventional techniques such as those required for aquatic subglacial environments. In this paper we present the first analysis of a subglacial brine from Taylor Valley, (~ 78°S), Antarctica for the trace metals: Ba, Co, Mo, Rb, Sr, V, and U. Samples were collected englacially using an electrothermal melting probe called the IceMole. This probe uses differential heating of a copper head as well as the probe’s sidewalls and an ice screw at the melting head to move through glacier ice. Detailed blanks, meltwater, and subglacial brine samples were collected to evaluate the impact of the IceMole and the borehole pump, the melting and collection process, filtration, and storage on the geochemistry of the samples collected by this device. Comparisons between melt water profiles through the glacier ice and blank analysis, with published studies on ice geochemistry, suggest the potential for minor contributions of some species Rb, As, Co, Mn, Ni, NH4+, and NO2−+NO3− from the IceMole. The ability to conduct detailed chemical analyses of subglacial fluids collected with melting probes is critical for the future exploration of the hundreds of deep subglacial lakes in Antarctica.
Conventional EEG devices cannot be used in everyday life and hence, past decade research has been focused on Ear-EEG for mobile, at-home monitoring for various applications ranging from emotion detection to sleep monitoring. As the area available for electrode contact in the ear is limited, the electrode size and location play a vital role for an Ear-EEG system. In this investigation, we present a quantitative study of ear-electrodes with two electrode sizes at different locations in a wet and dry configuration. Electrode impedance scales inversely with size and ranges from 450 kΩ to 1.29 MΩ for dry and from 22 kΩ to 42 kΩ for wet contact at 10 Hz. For any size, the location in the ear canal with the lowest impedance is ELE (Left Ear Superior), presumably due to increased contact pressure caused by the outer-ear anatomy. The results can be used to optimize signal pickup and SNR for specific applications. We demonstrate this by recording sleep spindles during sleep onset with high quality (5.27 μVrms).