Novel Packaging Technology for Microelectromechanical-System Devices

Abstract

We show the existence of a new class of astrophysical objects where the self-gravity of the dust is balanced by the force arising from shielded electric fields on the charged dust. The problem of equilibrium dust clouds is formulated in terms of an equation of hydrostatic force balance together with an equation of state. Because of the dust charge reduction at high dust density, the adiabatic index reduces from two to zero. This gives rise to a mass limit M AS for the maximum dust mass that can be supported against gravitational collapse by these fields. If the total mass M D of the dust in the interstellar cloud exceeds M AS , the dust collapses, while in the case M D < M AS , equilibrium may be achieved. The physics of the mass limit is similar to the Chandrasekhar's mass limit for compact objects, such as white dwarfs and neutron stars.

Development of a Piezo-Driven Liquid Jet Dispenser with Hinge-Lever Amplification Mechanism

“…The applications of liquid dispensing technology have abruptly increased in the past few decades because of the adoption of fluid dispensing in photovoltaic solar power industry, bio-medical devices, electronic packaging equipment, light-emitting diode (LED) encapsulation, and bonding or filling of non-electrical components [1][2][3][4][5][6][7][8]. In most of the circumstances, dispensers are required to generate accurate sized, high speed, and compact drops on demand thus the innovation in dispenser design has become a prerequisite to keep up with the demands of industry [3,9].…”

Pneumatic Conveying Printing Based on Super Hydrophobic Surface

“…More often, viscosity reducing and pressure increasing are adopted at the same time [ 10b,16 ] for handling inks with extremely high viscosity, for instance, silica gel, adhesive, sealant and so on. [ 17,18 ] The third strategy is utilizing external forces generated by other mechanisms and devices outside the ink chamber/pipeline, to print/dispense the viscous inks without reducing the viscosity or increasing the pressure within the chamber/pipeline. This strategy is represented by the well‐known electro‐hydrodynamic printing (also known as e‐jet printing), [ 19 ] and the recently developed acoustophoretic printing technique.…”

Droplet formation study of a liquid micro-dispenser driven by a piezoelectric actuator

“…In microelectronics packaging field, precise dispensing of liquid materials such as adhesives and fillers is an indispensable technical measure to ensure the quality of chip packaging [1][2][3]. With the development of microelectronics technology, the required volume of droplets is getting smaller and smaller, the required liquid operating speed is getting faster and faster, and the dispensing accuracy is getting higher and higher during the experimental process [4][5][6][7].…”