1,825 research outputs found
Lateral control by spoilers at the DVL. Part 1: Systematic wind-tunnel tests concerning the problem of lateral control by spoilers permeable to air. Part 2: Contribution to the lateral control by spoilers at the DVL. Part 3: Flight tests in the lateral controls by spoilers on the airplane model Fieseler FI 156
Evidence for Multiple Phase Transitions in La_1-xCa_xCoO_3
We report thermal-expansion and specific-heat data of the series
La_1-xCa_xCoO_3 for 0 <= x <= 0.3. For x = 0 the thermal-expansion coefficient
alpha(T) features a pronounced maximum around T = 50 K caused by a
temperature-dependent spin-state transition from a low-spin state (S=0) at low
temperatures towards a higher spin state of the Co^3+ ions. The partial
substitution of the La^3+ ions by divalent Ca^2+ ions causes drastic changes in
the macroscopic properties of LaCoO_3. Around x ~ 0.125 the large maximum in
alpha(T) has completely vanished. With further increasing x three different
anomalies develop
Temperature dependence of the response of lithium-drifted germanium detectors to gamma rays
Temperature dependence of lithium-drifted germanium detector response to gamma radiatio
Influence of the interfacial transition zone and microcracking on the diffusivity, permeability and sorptivity of cement-based materials after drying
A procedure for the fatigue life prediction of straight fibers pneumatic muscles
Different from the McKibben pneumatic muscle actuator, the straight fibers one is made of an elastomeric tube closed at the two ends by two heads that ensure a mechanical and pneumatic seal. High stiffness threads are placed longitudinally into the wall of the tube while external rings are placed at some sections of it to limit the radial expansion of the tube. The inner pressure in the tube causes shortening of the actuator. The working mode of the muscle actuator requires a series of critical repeated contractions and extensions that cause it to rupture. The fatigue life duration of a pneumatic muscle is often lower than traditional pneumatic actuators. The paper presents a procedure for the fatigue life prediction of a straight-fibers muscle based on experimental tests directly carried out with the muscles instead of with specimens of the silicone rubber material which the muscle is made of. The proposed procedure was experimentally validated. Although the procedure is based on fatigue life duration data for silicone rubber, it can be extended to all straight-fibers muscles once the fatigue life duration data of any material considered for the muscles is known
Biochemical, immunological, and immunocytochemical evidence for the association of chalcone synthase with endoplasmic reticulum membranes.
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