[en] Mathematical modeling and systematic analysis of viscoelastic processes in polymers are the basis for methods we have developed for computer-assisted prediction and qualitative analysis of polymer parachute cords. Solving the problem of qualitative analysis of deformation properties for parachute cords will let us improve the performance characteristics of domestic parachute systems and to improve their safety and functionality.

[en] We present a publicly-available toolkit of flight-proven hardware and software to retrieve 5 TB of data or small physical samples from a stratospheric balloon platform. Before launch, a capsule is attached to the balloon, and rises with it. Upon remote command, the capsule is released and descends via parachute, continuously transmitting its location. Software to predict the trajectory can be used to select a safe but accessible landing site. We dropped two such capsules from the SUPERBIT telescope, in September 2019. The capsules took $\sim <!--\; ???\; -->$37 minutes to descend from $\sim <!--\; ???\; -->$30 km altitude. They drifted 32 km and 19 km horizontally, but landed within 300 m and 600 m of their predicted landing sites. We found them easily, and successfully recovered the data. We welcome interest from other balloon teams for whom the technology would be useful.

[en] We have studied the dynamics of red blood cells and fluid lipid vesicles in hydrodynamic flow fields created by microchannels with periodically varying channel width. For red blood cells we find a transition from a regime with oscillating tilt angle and fixed shape to a regime with oscillating shape with increasing flow velocity. We have determined the crossover to occur at a critical ratio L_y/v_m∼2.2 x 10^-3 s with channel width L_y and red blood cell velocity v_m. These oscillations are superposed by shape transitions from a discocyte to a slipper shape at low velocities and a slipper to parachute transition at high flow velocities.

[en] This bibliographical sheet presents a book in which the author proposes an overview of remarkable scientific and technical experiments which took place in Paris, either in the public space or in research laboratories, since the eighteenth century: measurement of sound propagation speed, first flight in air balloon, water decomposition into hydrogen and oxygen, first parachute jump, first test of a draisine, first tests of electric public lighting on Place de la Concorde, the Foucault pendulum, first movie screening by Louis Lumiere, the discovery of radon by Marie and Pierre Curie, and so on

[en] The structure modification of Co₃O₄ nano-parachute (i.e., nanosheets with part of nanowires as backbones) grown directly on conducting Ni foam substrates was successfully realized via a facile solution route followed by calcinations. By adjusting [OH⁻] value, two kinds of (Co(CO₃)_0.5(OH)_0.11H₂O) nanostructures (nanoarray and parachute-like) were obtained. Compared with other Co₃O₄ nanosheets, such nano-parachute not only inherits the advantages of nanosheet but also shows enormous net space between nanobuilding units. A possible formation mechanism for the two structures has been proposed. As anode materials for lithium-ion batteries, this sheet-like morphology on Ni foam exhibited enhanced lithium storage capacity

[en] In an operation, belly landing is mostly applied as recovery method especially on research Unmanned Aerial Vehicle (UAV) such as Aludra SR-10. This type of landing method may encounter tough landing on hard soil and gravel which create high impact load on the aircraft. The impact may cause structural or system damage which costly to be repaired. Nowadays, Parachute Recovery System (PRS) recently used in numerous different tasks such as landing purpose to replace belly landing technique. Parachute use in this system to slow down flying or falling UAV to a safe landing by opening the canopy to increase aerodynamic drag. This paper was described the Computational Fluid Dynamic (CFD) analysis on ALUDRA SR-10 model with two different conditions i.e. the UAV equipped with and without parachute in order to identify the changes of aerodynamic characteristics. This simulation studies using solid models of aircraft and hemisphere parachute and was carried out by using ANSYS 16.0 Fluent under steady and turbulent flow and was modelled using the k-epsilon (k-ε) turbulence model. This simulation was limited to determine the drag force and drag coefficient. The obtained result showed that implementation of parachute increase 0.25 drag coefficient of the aircraft that is from 0.93 to 1.18. Subsequent to the reduction of descent rate caused by the parachute, the drag force of the aircraft increase by 0.76N. These increasing of drag force of the aircraft will produce lower terminal velocity which is expected to reduce the impact force on the aircraft during landing. (paper)