The design and operation of a cascade matrix electron flow amplifier based on an concentrator multiplier is considered. Unlike classical microchannel plates, the proposed can provide high density output current, which also allows it to be used as field cathode in vacuum microelectronics giga terahertz ranges. Keywords: Microchannel plate, secondary emission, screening, multiplier, cathode.

Microchannels typically have rectangular cross-sections, whereas biological channels, such as blood vessels and airways, circular cross-sections. The difference in cross-sections causes different fluidic behaviors, resulting differences between behavior microchannels channels. To simulate vitro, cross-sectional are required. We developed a microchannel with smooth channel wall, free from cracks...

Microchannel heat sinks are very widely used due to their high transfer coefficients and low refrigerant requirements. Nevertheless, microchannel still perform sub-optimally when it comes thermal performance. Therefore, this paper investigates the individual combined impacts of different characteristics porous media on performance microchannel. Four porosity values considered: 0.8, 0.85, 0.9, 0...

A finite-element model is presented for numerical simulation in three dimensions of acoustophoresis suspended microparticles a microchannel embedded polymer chip and driven by an attached piezoelectric transducer at MHz frequencies. In accordance with the recently introduced principle whole-system ultrasound resonances, optimal resonance mode identified that related to acoustic combined transdu...

The heat transfer enhancement and entropy generation of Al2O3-water nanofluids laminar convective flow in the microchannels with flow control devices (cylinder, rectangle, protrusion, and v-groove) were investigated in this research. The effects of the geometrical structure of the microchannel, nanofluids concentration φ(0%–3%), and Reynolds number Re (50–300) were comparatively studied by mean...

Insulator-based dielectrophoresis (iDEP) was utilized to separate and concentrate selectively mixtures of two species of live bacteria simultaneously. Four species of bacteria were studied: the Gram-negative Escherichia coli and the Gram-positive Bacillus subtilis, B. cereus, and B. megaterium. Under an applied direct current (DC) electric field all the bacterial species exhibited negative diel...

X-ray fluorescence imaging is a widely used, nondestructive method for determining the distribution and relative concentration of metals within a sample. To create a two-dimensional map of an image, x-rays are usually sent through a 25-250 μm wide aperture, then point by point an image is scanned. Microchannel plates contain an array of tiny holes that can be used to collimate x-rays fluorescin...

Despite significant advances in robotics, commercially advanced prosthetics provide only a small fraction of the functionality of the amputated limb that they are meant to replace. Peripheral nerve interfacing could provide a rich controlling link between the body and these advanced prosthetics in order to increase their overall utility. Here, we report on the development of a fully integrated ...

In recent years, the biochip by MEMS technology has been developed. The biochip has the advantages of biocompatibility, precision, low-cost, disposable, and easy to produce etc. MEMS technology widely used in cell detection or position a single-cell level, including the mechanical, optical electromagnetic and electronic fields. This study proposal, imitate the oviduct that can effectively posit...

Uniform silicon nanowires (SiNW) were successfully fabricated on the top, bottom, and sidewall surfaces of silicon microchannels by using a two-step electroless etching process. Different microchannel patterns with the channel width from 100 to 300 lm were first fabricated in a 10 mm 10 mm silicon chip and then covered by SiNW with an average height of 10–20 lm. The effects of the microchannel ...