分类： 生物学 >> 生物物理学 >> 神经科学 分类： 物理学 >> 交叉学科物理及相关领域的科学与技术 提交时间： 2025-05-06
摘要： How animals perceive weak magnetic signals remains a mystery. Here I propose that the sensory inputs can be modulated in their transmission velocity along the peripheral nerves surrounded by Schwann cells which contain huge amounts of superparamagnetic iron nanoparticles stored in ferritins, forming the ordered arrays of hexagonal paracrystalline. Through interparticle interactions within the arrays, the superparamagnetic nanoparticles become subtly magnetized and aligned orderly with the Earth’s magnetic field. The Lorentz force of the small magnetic field created by the paracrystalline arrays will shift the motion trajectory of cations of action potentials whenever the magnetic line is not parallel to the direction of movement of the ions, from a straight path to a curve track within the myelinated axons. Since bending orientations of the peripheral nerve are always mirror-symmetric, the Lorentz force can delay transmission on one side where the ion trajectory does not fit the axon curve, but has almost no such effect on the other side where the ions can travel along the radian of the axon curve. This mechanism can create a time difference in arrival at the CNS nucleus between the two sides, activating the deviated coincidence detector neurons so that the directions of the external magnetic “source” are encoded and processed.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
摘要： This paper presents a novel cylindrical-shaped Flexure-based Electromagnetic Linear Actuator [FELA] that exhibits predictable and re-configurable open-loop positioning resolution. By combining contactless Lorentz-force actuation and frictionless flexure-based supporting bearings, it produces high repeatable motion and sub-micron positioning resolution. In this paper, the design concept of this cylindrical-shaped FELA will be introduced. It focuses on the modeling of the flexure-based supporting bearings, the thermal modeling of the electromagnetic module, and the unique characteristics of FELA, i.e., predictable and re-configurable open-loop positioning resolution. A prototype was developed to evaluate the performance and demonstrate these unique characteristics of this new class of nanopositioning actuator.
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