A5016464577- Advanced MEMS and NEMS Technologies
- Acoustic Wave Resonator Technologies
- Innovations in Concrete and Construction Materials
- Concrete and Cement Materials Research
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Surface Polishing Techniques
- Construction Engineering and Safety
- Optical Imaging and Spectroscopy Techniques
- Building materials and conservation
- Infrastructure Maintenance and Monitoring
- Biomedical Ethics and Regulation
- Recycling and Waste Management Techniques
- Ferroelectric and Piezoelectric Materials
- RFID technology advancements
- Recycled Aggregate Concrete Performance
- Spaceflight effects on biology
- Cardiovascular Health and Disease Prevention
- BIM and Construction Integration
- QR Code Applications and Technologies
- Non-Invasive Vital Sign Monitoring
- Force Microscopy Techniques and Applications
- Dam Engineering and Safety
University of Cambridge
2023-2024
Sensors (United States)
2006
University of California, Berkeley
2005-2006
Alcatel Lucent (Germany)
2002
A 1296-port MEMS transparent optical crossconnect with 5.1dB/spl plusmn/1.1dB insertion loss at 1550 nm is reported. Measured worst-case crosstalk in a fabric was n38 dB and nominal switching rise/fall times were 5 ms. 2.07 petabit/s switch capacity verified upon cross-connecting forty-channel by 40 Gb/s DWDM data stream through prototype fabric.
Relating the empirical slump test to yield stress facilitates capture of fresh state concrete performance in fundamental quantitative terms whilst avoiding requirement for expensive rheological equipment. This paper proposes a novel method predict from by directly measuring height unyielded region, via 3D reconstruction approach. The efficacy proposed is assessed through an experimental series 21 tests. results indicate better correlation between region and compared total stress. methodology...
We describe and validate a new failure prediction methodology specifically designed for single-crystal microelectromechanical systems (MEMS) devices under general service loadings. The uses experimental data efficiently generated from fracture testing of simple test specimens to calculate series Weibull parameters descriptive specific surface conditions. These data, combined with finite element modeling, are used predict the probability any MEMS device fabricated by same processes type...
A new class of mechanically coupled contour mode MEMS filters is demonstrated using a thin film piezoelectric aluminum nitride (AlN) process. The use modes, whose frequencies are set by lithographically defined dimensions, permits the co-fabrication multiple at arbitrary on same chip. stronger electromechnical coupling structural material vis-à-vis electrostatically transduced devices results in lower insertion losses (as low as 1.5 dB) with termination values 1 to 2.5 kΩ. Finally,...
A 72/spl times/72 wavelength-selective crossconnect switch, that is scalable to 1296/spl times/1296 with current technology, presented. Silica-on-silicon wavelength multiplexers integrated monitoring taps and a MEMS micromirror array were assembled in hybrid 3D beam steering having 20 dB insertion loss, 100 GHz channel spacing 30 passbands.
Two novel mechanical coupling methods for synthesizing highly-integrated contour mode piezoelectric aluminum nitride (AlN) filters are introduced. While the underlying resonator technology remains most viable candidate realizing arrays of post-CMOS compatible at arbitrary frequencies with on-chip matching to 50 Ω, previously demonstrated topologies do not scale well beyond 100 MHz. The current work focuses on design and fabrication techniques intended extend numerous inherent advantages AlN...
An information gap exists in the construction industry, where stakeholders possess that is not effectively shared or sufficiently detailed. The increases uncertainty decision-making processes, leading to design conservatism, project delays and errors. Reducing over-design waste concrete practice critical achieving greater sustainability. Bridging gap, therefore, supports sustainable change can be reinforced by digital transformation aids availability. Nevertheless, complexity current...
Abstract Achieving traceability of concrete materials is a crucial step toward promoting sustainable use. This includes creating accurate Environmental Product Declarations, minimizing mistakes during placement, and improving understanding the relationship between constituents performance. Despite these benefits, effective for has not yet been achieved in laboratory environment or within wider practice. work sets out digital thread use functional requirements framework adoption environment....
Novel piezoelectric MEMS resonators with magnetic shielding have been developed to mechanically generate RF fields in the MHz frequency range from static fields. Thermally evaporated thin film nickel iron (NiFe) (10 20 nm) was deposited a saturation flux density of 0.5 T, coercivity 500 A/m and high relative permeability 3.7 × 103. Aluminum nitride (AlN) for operation, resonate contour mode increase decrease gap surrounding resonator. This gap, 200 350 nm, is formed using silicon sidewall...
We describe and validate a new failure prediction methodology specifically designed for single-crystal MEMS devices under general service loadings.The uses experimental data efficiently generated from fracture testing of simple test specimens to calculate series Weibull parameters descriptive specific surface conditions.These data, combined with finite element modeling, are used predict the load distribution any device fabricated by same process, type loading.We demonstrate accuracy our...