We show that the timing properties of a pulsed low-energy positron lifetime beam can be conveniently tested by an electron beam. We apply this method to study time resolution of the beam and electron scattering in a flat and a ’sawtooth’ shaped choppers. The results show that (i) time resolution of 160 ps is obtained, (ii) the scattering of the electrons and the secondary electron yield of the ...

This article presents some new experimental data for study the shielding effect of electromagnetic wave. The frequencies of electromagnetic wave are mainly focused on emission of daily electrical equipments, which are normally called “low frequency electromagnetic waves”. In this work, a water pump with maximum magnetic field intensity of ca. 2300 mG was applied as emission source of the electr...

There has been significant progress over the last few years in the development of technologies for microchannel plate (MCP) imaging detectors in the ultraviolet. The nominal configuration of this type of detector consists of a photocathode to convert incoming radiation to photoelectrons, MCP’s to amplify the signals, followed by either an optical or electronic image readout scheme. Areas where ...

Isochronous Mass Spectrometry (IMS) in the ESR has successfully applied recently [1]. At FAIR, IMS will be performed in the Collector Ring (CR) in combination with the Super-FRS and thus substantially extend the reach of mass measurements to more exotic ions. In IMS the masses of the nuclei are directly determined from the revolution frequencies measured by a microchannel plate (MCP) time-of-fl...

Emulsions are widely used in food industry, among others. Monosized droplets in emulsions have advantages for control of their properties, and application fields. We have developed microchannel emulsification (MC) technology for monosized droplets formation. The grooved type MC and module were used to characterize MC emulsification, and straight-through MC and module were developed for higher p...

We have demonstrated a new approach for detecting biomolecular mass in the aqueous environment. Known as the suspended microchannel resonator (SMR), target molecules flow through a suspended microchannel and are captured by receptor molecules attached to the interior channel walls [1]. As with other resonant mass sensors, the SMR detects the amount of captured target molecules via the change in...

Three-dimensional Li ion microbatteries are known for their high surface area which leads to high current and capacity compared to traditional planar batteries. This paper describes economical approaches to prepare half 3D microbatteries based on silicon microchannel plates (MCP). The high aspect ratio silicon MCP is formed by electrochemical etching and a nickel layer is coated onto the silico...

We demonstrated a liquid/liquid and a gas/liquid two-phase crossing flow in glass microchips. A 250-microm-wide microchannel for aqueous-phase flow was fabricated on a top glass plate. Then, as a way to utilize the surface energy difference for stable phase confluence and separation, a 250-microm-wide microchannel for organic-phase (or gas-phase) flow was fabricated on a bottom glass plate and ...

We present a microfluidic technique for sensitive, real-time, optimized detection of airborne water-soluble molecules by surface-enhanced Raman spectroscopy (SERS). The method is based on a free-surface fluidic device in which a pressure-driven liquid microchannel flow is constrained by surface tension. A colloidal suspension of silver nanoparticles flowing through the microchannel that is open...

1 We report on a fabrication and packaging process for a microsystem consisting of a mass-based 2 protein detector and a fully integrated preconcentrator. Preconcentration of protein is achieved 3 by means of a nanofluidic concentrator, which takes advantage of fast non-linear electro-osmotic 4 flow near a nanochannel-microchannel junction to concentrate charged molecules inside a 5 volume of f...