Note on the distortion of (2,q)-torus knots

We show that the distortion of the (2,q)-torus knot is not bounded linearly from below.Comment: 8 pages, 6 figure

Brushless dc motor uses electron beam switching tube as commutator

Electron beam switching tube eliminates physical contact between rotor and stator in brushless dc motor. The tube and associated circuitry control the output of a dc source to sequentially energize the motor stator windings

Single radial magnetic bearing: A concept

Proposed bearing has increased stability. Magnetic structure keeps inner and outer bearing halves aligned. Electronic feedback circuit keeps bearing radially centered

Magnetic bearing and motor

A magnetic bearing for passively suspending a rotatable element subjected to axial and radial thrust forces is disclosed. The magnetic bearing employs a taut wire stretched along the longitudinal axis of the bearing between opposed end pieces and an intermediate magnetic section. The intermediate section is segmented to provide oppositely directed magnetic flux paths between the end pieces and may include either an axially polarized magnets interposed between the segments. The end pieces, separated from the intermediate section by air gaps, control distribution of magnetic flux between the intermediate section segments. Coaxial alignment of the end pieces with the intermediate section minimizes magnetic reluctance in the flux paths endowing the bearing with self-centering characteristics when subjected to radial loads. In an alternative embodiment, pairs of oppositely wound armature coils are concentrically interposed between segments of the intermediate section in concentric arcs adjacent to radially polarized magnets to equip a magnetic bearing as a torsion drive motor. The magnetic suspension bearing disclosed provides long term reliability without maintenance with application to long term space missions such as the VISSR/VAS scanning mirror instrument in the GOES program

Conditions of Knowledge

In this paper I suggest an account of knowledge by adding a fourth condition to the traditional analysis in terms of justified true belief. I am going to make a first proposal ruling out the Gettier-counterexamples.1 This proposal will then be corrected in the light of other counterexamples. The final analysis will be a combination of a justified-true-belief-account and a causal account of knowledge. Some philosophers have disputed that Gettier‟s examples must be accepted as refutations of the justified true belief analysis of knowledge.2 Their rejection rests on declining a principle underlying Gettier‟s reasoning, namely – as Thalberg calls it – the principle of deducibility of justification (PDJ). PDJ reads as following: For any proposition p, if a person S is justified in believing p, and p entails q, and S deduces q from p and accepts q as a result of this deduction, then S is justified in believing q. This principle allows, for example, the move in Gettier‟s first example from the proposition a) “Jones is the man who will get the job and Jones has ten coins in his pocket” to proposition b) “The man who will get the job has ten coins in his pocket”.

Liberalism, Perfectionism, and Civic Virtue

This paper explores the question whether perfectionism amounts to a political doctrine that is more attractive than liberalism. I try to show that an egalitarian liberalism that is open to questions of value and that holds a conception of limited neutrality can meet the perfectionist challenge. My thesis is that liberalism can be reconciled easily with perfectionism read as a moral doctrine. Perfectionism as a political doctrine equall stays within the value framework of liberalism. Finally, I try to show that liberalism can give an account of civic virtue that is a sufficient basis for developing the normative guidelines of a rich and meaningful social life

Brushless direct-current motor with stationary armature and field

Electronically commutated dc motor has an active fixed field winding, and active fixed armature winding, and passive rotor. By use of brushless dc motor switching technique, motor provides continuous controllable and reversible torque without use of sliding contacts