We report the magnetic field detection properties of ballistic sensors utilizing the negative bend resistance of InSb∕In(1-x)Al(x)Sb quantum well cross junctions as a function of temperature and geometric size. We demonstrate that the maximum responsivity to magnetic field and its linearity increase as the critical device dimension is reduced. This observation deviates from the predictions of t...

A small radius discharge in hydrogen inductively driven by a planar coil is studied experimentally regarding development of a matrix source of negative hydrogen ions: a matrix of small radius discharges, each of them completed with a magnetic filter and a single aperture extraction device. Probe and laser photodetachment diagnostics are the methods employed. Results for the axial structure of t...

This paper describes a novel approach to capsular endoscopy that takes advantage of active magnetic locomotion in the gastrointestinal tract guided by an anthropomorphic robotic arm. Simulations were performed to select the design parameters allowing an effective and reliable magnetic link between the robot end-effector (endowed with a permanent magnet) and the capsular device (endowed with sma...

With a growing number of cell-based biotechnological applications, there is a need for particle separation systems capable of multiparameter separations at high purity and throughput, beyond what is presently offered by traditional methods including fluorescence activated cell sorting and column-based magnetic separation. Toward this aim, we report on the integration of microfluidic acoustic an...

Magnetic levitation as a means of motion and force/torque control can provide many advantages for high-fidelity haptic interaction, as compared to motorized linkage and cable actuation. Impedance-based haptic interface devices function both as force display devices, generating forces and/or torques to be felt by the user, and as input devices, sensing the motions imparted by the user to the dev...

We propose a new integrated device for spintronics application, which is based on a hybrid metal-semiconductor structure. The device consists of a Si-based p-i-n photodetector sandwiched between two layers of a ferromagnetic metal (3d ferromagnet or half-metallic compound). The photocurrent flowing in such a system is shown to depend on its magnetic configuration. This, in turn, allows controll...

The axial position of a magnetic field gradient has been varied for capacitive discharges in the linear plasma device VINETA. For low magnetic fields (B ≤ O(10 mT)), double layers have been observed to form predominantly at the interface between the source and the plasma chamber. In particular, double layer position is independent of the position of the magnetic field gradient. However, shiftin...

INTRODUCTION The earliest geophysical exploration strategies relied on measurements of variations in the Earth's magnetic field. Even today, magnetic methods are the most commonly used geophysical exploration techniques because magnetic observations can be made relatively easily and cheaply. Although compasses are the most common type of mechanical device used to measure the horizontal attitude...

OBJECTIVE To determine if the chronic pain frequently presented by postpolio patients can be relieved by application of magnetic fields applied directly over an identified pain trigger point. DESIGN Double-blind randomized clinical trial. SETTING The postpolio clinic of a large rehabilitation hospital. PATIENTS Fifty patients with diagnosed postpolio syndrome who reported muscular or arth...