منابع مشابه
Drawing a spark from darkness: John Walsh and electric fish.
John Walsh's research on electric fish, carried out between 1772 and 1775, proved fundamental for demonstrating that electricity might be involved in animal physiology, and, moreover, in favouring a period of great progress in both the physiology and physics of electrical phenomena. However, Walsh is hardly known to modern neuroscientists and is largely neglected by science historians also. One...
متن کاملInfluence of the laser spark generation mechanism on electric and magnetic fields in its vicinity
A laser spark formed by the focused beam of a ns high energy laser in a gas filled interaction chamber can mimic energetic events in the early Earth atmosphere, which are thought to be instrumental in the synthesis of simple chemical compounds, such as some amino acides, [1, 2], which later might have participated in more complex organic syntheses leading to the origin of terrestrial life. Some...
متن کاملA focused electric spark source for non-contact stress wave excitation in solids.
A focused electric spark is used as a non-contact acoustic source to excite stress waves in solids. The source consists of an electric spark source located at the near focus of an ellipsoidal reflector that focuses the acoustic disturbance generated by the spark source to the far focal point. Experimental studies using both contact and non-contact sensors indicate that the source has the capabi...
متن کاملSimulation of thermal and electric field evolution during spark plasma sintering
Finite element simulations have been conducted to determine the temperature distribution (both in radial and axial direction), heat and electric flux-field in the powder compact/die/punch assembly during the spark plasma sintering (SPS) process. A thermal–electrical coupled model with temperature dependent thermal and electrical properties is implemented. The simulation studies were conducted u...
متن کاملFrom sequence to spike to spark: evo-devo-neuroethology of electric communication in mormyrid fishes.
Mormyrid fishes communicate using pulses of electricity, conveying information about their identity, behavioral state, and location. They have long been used as neuroethological model systems because they are uniquely suited to identifying cellular mechanisms for behavior. They are also remarkably diverse, and they have recently emerged as a model system for studying how communication systems m...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1906
ISSN: 0036-8733
DOI: 10.1038/scientificamerican01271906-25144supp