We present a method of simulating the Dirac equation in 3+1 dimensions for a free spin-1/2 particle in a single trapped ion. The Dirac bispinor is represented by four ionic internal states, and position and momentum of the Dirac particle are associated with the respective ionic variables. We show also how to simulate the simplified 1+1 case, requiring the manipulation of only two internal level...

High precision control of micro- and nanoscale objects in aqueous media is an essential technology for nanoscience and engineering. Existing methods for particle trapping primarily depend on optical, magnetic, electrokinetic, and acoustic fields. In this work, we report a new hydrodynamic flow based approach that allows for fine-scale manipulation and positioning of single micro- and nanoscale ...

Submitted for the DFD12 Meeting of The American Physical Society Surface Acoustic Wave (SAW) based Microfluidics for Particle and Droplet Manipulation YE AI, BABETTA L. MARRONE, Advanced Measurement Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA — Acoustics has emerged as one of the most promising non-invasive techniques for particle and droplet manipulation in micro...

Abstract Applying a robot system in ultrasound-guided percutaneous intervention is an effective approach for prostate cancer diagnosis and treatment. The limited space manipulation restricts structure volume motion. In this paper, 8-degree-of-freedom proposed ultrasound probe manipulation, needle positioning, insertion. A novel parallel employed the saving, structural rigidity, collision avoida...

by Martyn Hill∗ B iotechnology and automated assembly often involve the manipulation of tiny particles, such as cells, small organisms, and other submillimeter objects. In many cases, this manipulation needs to be performed without touching the particles. Yet doing so accurately is a challenge, particularly in biocompatible setups. Two groups, one in France, the other in the UK, have now made a...

– We show that a mesoscopic system such as Feynman’s ratchet may operate as a heat pump, and clarify a underlying physical picture. We consider a system of a particle moving along an asymmetric periodic structure. When put into a contact with two distinct heat baths of equal temperature, the system transfers heat between two baths as the particle is dragged. We examine Onsager relation for the ...

we sought to understand  whether,  how, and  why the translated journalistic texts  related  to  the  iranian  nuclear  negotiations  were manipulated. to this end,  we  monitored  a news agency’s webpage in a time span of 46 days that began 3 days before almaty i nuclear talks and ended  3  days  after  almaty  ii  talks.  monitoring  resulted  in  a  corpus  made  up  of  36  target  texts  p...

the most modern techniques in biotechnology owe their existence to the discovery of dna cloning and the genetic manipulation of organisms. however biotechnology is not new science in fact, many applications represent old practices with new methodologies. human have been used organisms for their benefit in many processes for several thousand years. therefore, one way of thinking about biotechnol...

A size-dependent particle separation (classification) is one of the most important procedures in biochemical, environmental, or medical analyses and their applications. However, the smaller particle size or the smaller size difference makes the particle classification difficult. The Lab-on-a-Chip concept have encouraged the miniaturization of various separation or selection methods for small pa...

AIM Nutritional parameters, such as B-vitamins, have not been studied for an association with low-density lipoprotein (LDL) particle size. The present study explored whether serum vitamin levels, including folate and vitamin B-12, could be associated with LDL particle size. METHODS Using a randomly selected population of 255 hospital workers, we collected detailed lipid profiles, including tr...