Engineering

Design, development and characterization of an x-band 5 bit DMTL phase shifter using an inline MEMS bridge and MAM capacitors
A radio frequency micro-electro-mechanical system (RF-MEMS) 5 bit phase shifter based on a distributed MEMS transmission line concept with excellent phase accuracy and good repeatability is presented in this paper. The phase shifter is built with three fixed–fixed beams; one is switchable with electrostatic actuation and the other two are fixed for a metal–air–metal (MAM) capacitor. The...


Low-temperature anodic bonding using thin films of lithium-niobate-phosphate glass
This paper reports on the investigation of a low-temperature anodic bonding process with layers of a lithium-niobate-phosphate glass on chip level. The glass layers are deposited by means of rf sputtering. The applied glass is characterised by its high ion conductivity, enabling anodic bonding at room temperature. of the optimisation process concerning the intrinsic stress of the glass layers a...
Development of an electrohydrodynamic ion-drag micropump using three-dimensional carbon micromesh electrodes
An electrohydrodynamic (EHD) ion-drag micropump using three-dimensional carbon micromesh electrodes was developed. The carbon micromesh electrodes were created by the pyrolysis of SU-8 structures. The carbon electrodes and microchannel were formed on a quartz substrate, and the microchannel was sealed by an SU-8 slab structure. The pumping behaviors were evaluated using Fluorinert as a non-cond...


A facile and simple high-performance polydimethylsiloxane casting based on self-polymerization dopamine
We present a new and facile method for polydimethylsiloxane (PDMS) casting by dip-coating the master molds in an aqueous solution of dopamine. A poly(dopamine) film formed by self-polymerization of dopamine is used as the surface anti-adhesion coating for PDMS de-molding. Different master molds, such as metal, silicon and PDMS replica, were used to verify the feasibility of this proposed PDMS c...
On-chip enucleation of an oocyte by untethered microrobots
We propose a novel on-chip enucleation of an oocyte with zona pellucida by using a combination of untethered microrobots. To achieve enucleation within the closed space of a microfluidic chip, two microrobots, a microknife and a microgripper were integrated into the microfluidic chip. These microrobots were actuated by an external magnetic force produced by permanent magnets placed on the robot...


Epitaxial patterning of thin-films: conventional lithographies and beyond
Thin-film based novel magnetic and electronic devices have entered a new era in which the film crystallography, structural coherence, and epitaxy play important roles in determining their functional properties. The capabilities of controlling such structural and functional properties are being continuously developed by various physical deposition technologies. Epitaxial patterning strategies fu...
Phase separation micromoulding and photopatterning based on radiation induced free radical polymerisation of acrylates for the microfabrication of porous monolithic structures
Two different microfabrication techniques for the preparation of monolithic porous polymeric 3D microstructures were assessed. The first approach is based on a radiation assisted imprint process. Electron beam initiated free radical polymerisation of acrylates/methacrylates in a porogenic solvent within the confinements of V-shaped microgrooves in a silicon master enables the pattern transfer, ...

Fabrication and characterization of a charge-biased CMOS-MEMS resonant gate field effect transistor
A high-frequency charge-biased CMOS-MEMS resonant gate field effect transistor (RGFET) composed of a metal–oxide composite resonant-gate structure and an FET transducer has been demonstrated utilizing the TSMC 0.35  μ m CMOS technology with Q > 1700 and a signal-to-feedthrough ratio greater than 35 dB under a direct two-port measurement configuration. As compared to the conventional ca...
Dynamic Instability Characteristics of Thin Plate Like Beam with Internal Damage Subjected to Follower Load
This study investigates the vibration, buckling and dynamic instability characteristics of damaged cross-ply and angle-ply laminated plate like beam under follower loading using the finite element approach. The damage is anisotropic in nature and parametrically incorporated into the composite using the concept of reduction in stiffness. It has been observed that damage shows a strong orthogonal...

Analysis of the Wave Localization in a Disordered Periodic Bridge with Pile–Soil–Water–Structure Coupling
In this study, the wave localization in a disordered periodic bridge (DPB) with the pile–soil–water–structure (PSWS) coupling is investigated For simplicity, each span of the bridge is assumed to be composed of a pile foundation, a pier, two composite beams and three linking springs. To determine the compliances of the pile foundations, the pile–soil–water (PSW) interaction is simulat...
Simulation, fabrication and impact testing of a novel football helmet padding system that decreases rotational acceleration
Recent studies suggest that concussion may be associated with long-term neurological sequelae. Both linear impact and rotational acceleration have been identified as contributors to concussion and traumatic brain injury (TBI). Modern football helmets are designed according to the National Operating Committee on Standards for Athletic Equipment (NOCSAE) standard for protection from linear impact...

Three-dimensional numerical simulation of red blood cell motion in Poiseuille flows
An immersed boundary method based on an FEM has been successfully combined with an elastic spring network model for simulating the dynamical behavior of a red blood cell (RBC) in Poiseuille flows. This elastic spring network preserves the biconcave shape of the RBC in the sense that after the removal of the body force for driving the Poiseuille flow, the RBC with its typical parachute shape in ...
Modeling tether–ballast asteroid diversion systems, including tether mass and elasticity
The risk of an impact between a large asteroid and the Earth has been significant enough to attract the attention of many researchers. This paper focuses on a mitigation technique that involves the use of a long tether and ballast mass to divert an asteroid. When such a tether is modeled as massless and inelastic, results show that the method may be viable for diverting asteroids away from a co...
Multiple spacecraft formation reconfiguration using solar radiation pressure
In this paper the use of solar radiation pressure for spacecraft formation reconfiguration at the L 2 Sun–Earth/Moon collinear libration point is presented. The system consisting of a leader and three follower spacecraft is considered. The leader spacecraft is assumed to be in a fixed halo trajectory and the follower spacecraft position relative to the leader satellite is controlled using two...
Scale-independent description of the rigid-body penetration of spherical projectiles into semi-infinite adobe targets
In impact experiments, the penetration depth of spherical projectiles into semi-infinite adobe targets has been investigated. In total, 20 tests were performed with steel projectiles of diameters 7.5, 10.0 and 13.5 mm in the velocity regime from 240 to 3230 m/s. In addition, 2 single experiments with aluminum and titanium projectiles were conducted at impact velocities of 830 and 920 m/s, respe...