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2. PIV investigation of acoustic transmission through curved duct bends for the optimisation of thermoacoustic systems

Author

Wee, David Shuon Tzern

Subjects
620.2, TJ Mechanical engineering and machinery
Abstract

The efficiency of travelling wave thermoacoustic system, for a given operating temperature difference, is determined by the acoustic wave transmission through its feedback resonator loop system. Curved duct bends are one of the most repeated components used in the construct of these feedback resonator systems and thus require acoustic transmission optimisation. This research investigates the transmission of low frequency, high amplitude acoustic waves propagating through duct bends with different radius of curvatures using Particle Image Velocimetry (PIV). The experimental PIV investigation was conducted on the axial plane of the bend. The velocity vector maps obtained from each run was analysed using both the newly developed Velocity based Wave Decomposition (VWD) technique as well as the Proper Orthogonal Decomposition (POD) technique. The POD technique was shown to successfully separate the different flow component of the acoustic wave in the respective Proper Orthogonal Modes (POMs). The acoustic transmission was thus computed based on the strength of these POMs. The POMs also allowed for the flow visualisation of the different loss mechanism that exists within the wave propagating through the bend (most notably, the energy cascade loss mechanism). Based on the quantitative measurement of the acoustic transmission as well as the qualitative flow observation of the different loss mechanism, a non-dimensional parameter was developed in order to characterise the acoustic transmission through curved duct bend systems. This parameter is known as the Strouhal-Dean number. Based on this parameter, the acoustic transmission can be characterised into 3 acoustic flow regimes: Viscous dominated oscillation, Inertia dominated oscillation and the Transition regime between the first two oscillation regimes. The optimum acoustic transmission range corresponded to the transition regime where the inertia generated secondary circulation was balanced by its viscous loss suppression. The optimal Strouhal Dean number for acoustic transmission was found to be approximately 10.8.

Published
2015

4. Development of PMUT Array Packaging from Characterisation Prototypes to Customer Samples

Author

Giusti, Dominico, primary, Gritti, Alex, additional, Quaglia, Fabio, additional, Savoia, Alessandro Stuart, additional, Sandoh, Hideyuki, additional, Klug, Gerald, additional, Hoshino, Hitoshi, additional, Rahul, Dutta, additional, Rao, Vempati Srinivasa, additional, Wee, David Ho Soon, additional, Wakahara, Masatoshi, additional, and Shaw, Mark, additional

Published
2023
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6. Co-packaging of PMUT array with FOWLP ASIC's

Author

Giusti, Domenico, primary, Quaglia, Fabio, additional, Rahul, Dutta, additional, Rao, Vempati Srinivasa, additional, Savoia, Alessandro, additional, Shaw, Mark, additional, and Wee, David Ho Soon, additional

Published
2022
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15. Looking Back: Graduates Reflect.

Author

Wee, David G. S.

Abstract

Seven graduates of Hawaii's PETOM (Preservice Education for Teaching of Minorities) program, all of whom currently teach in or work for schools, reflect on how the PETOM experience affected their teaching. All seven report that PETOM was important because it created a strong philosophy of teaching and learning. (SM)

Published
1993

18. Automated Attribute Measurements of Buried Package Features in 3D X-ray Images using Deep Learning

Author

Pahwa, Ramanpreet Singh, primary, Lay Nwe, Ma Tin, additional, Chang, Richard, additional, Min, Oo Zaw, additional, Jie, Wang, additional, Gopalakrishnan, Saisubramaniam, additional, Soon Wee, David Ho, additional, Qin, Ren, additional, Rao, Vempati Srinivasa, additional, Dai, Haiwen, additional, Neumann, Jens Timo, additional, Pichumani, Ramani, additional, and Gregorich, Tom, additional

Published
2021
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20. Uncovering prospective role and applications of existing and new nutraceuticals from bacterial, fungal, algal and cyanobacterial, and plant sources

Author

Al-Obaidi, Jameel R., Alobaidi, Khalid H., Al-Taie, Bilal Salim, Wee, David Hong Sheng, Hussain, Hasnain, Jambari, Nuzul Noorahya, Kamil, E. I. Ahmad, Ariffin, Nur Syamimi, Al-Obaidi, Jameel R., Alobaidi, Khalid H., Al-Taie, Bilal Salim, Wee, David Hong Sheng, Hussain, Hasnain, Jambari, Nuzul Noorahya, Kamil, E. I. Ahmad, and Ariffin, Nur Syamimi

Abstract

Nutraceuticals are a category of products more often associated with food but having pharmaceuticals property and characteristics. However, there is still no internationally accepted concept of these food-pharmaceutical properties, and their interpretation can differ from country to country. Nutraceuticals are used as part of dietary supplements in most countries. They can be phytochemicals which are biologically active and have health benefits. These can be supplied as a supplement and/or as a functional food to the customer. For human health and longevity, these materials are likely to play a vital role. Consumption of these items is typical without a therapeutic prescription and/or supervision by the vast majority of the public. The development of nutraceuticals can be achieved through many bioresources and organisms. This review article will discuss the current research on nutraceuticals from different biological sources and their potential use as an agent for improving human health and well-being, as well as the gaps and future perspective of research related to nutraceutical development.

Published
2021

24. Fine-Pitch RDL Integration for Fan-Out Wafer-Level Packaging

Author

Lianto, Prayudi, primary, Tan, Chin Wei, additional, Jie Peng, Qi, additional, Jumat, Abdul Hakim, additional, Dai, Xundong, additional, Peter Fung, Khai Mum, additional, Huei See, Guan, additional, Chong, Ser Choong, additional, Wee David Ho, Soon, additional, Serine Soh, Siew Boon, additional, Huang Sharon Lim, Seow, additional, Calvin Chua, Hung Ming, additional, Abdillah Haron, Ahmad, additional, Kenneth Lee, Huan Ching, additional, Zhang, Mingsheng, additional, Ko, Zhi Hao, additional, Ko San, Ye, additional, and Leong, Henry, additional

Published
2020
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30. Development of Antenna on FO-WLP

Author

Boon, Serine Soh Siew, primary, Wee, David Ho Soon, additional, Yao, Hsiao Hsiang, additional, Boon, Simon Lim Siak, additional, Shan, Sharon Lim Pei, additional, Choong, Chong Ser, additional, and Chong, Chai Tai, additional

Published
2018
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33. Getting Out of the Way of General Education.

Author

Wee, David L.

Abstract

Raises questions about the value of general education: Is general education a historical ideal whose time is past? Why include general education as a basis for accreditation? In what ways is general education central to other higher learning? Should some specialized institutions be allowed to waive the general education component? (DMM)

Published
1987

39. October 1964

Author

Wee, David L.

Subjects
October 1964 (Book) -- Book reviews, Books -- Book reviews, History, Regional focus/area studies
Published
1995

46. Low cost characterization of the electrical properties of thin film and mold compound for embedded wafer level packaging (EMWLP).

Author

Lim Ying Ying, Wee, David Ho Soon, Kim Hyoung Joon, and Damaruganath, Pinjala

Abstract

In recent years, embedded wafer level package (EMWLP) technology has become a promising platform for SiP integration [1] due to its relatively low cost and good electrical performance [1–2]. As the platform is being considered for higher frequency applications (eg. 77-GHz radar), it becomes pertinent to characterize for the dielectric properties of the materials involved. Another concern is that the dielectric properties of inhomogeneous materials (eg. mold compound) may vary from batch to batch. Thus, it is desirable to have structures which are compact to enable in-situ dielectric characterization. In this work, we propose meander T-resonator structure for in-situ dielectric characterization. We also attempt to extract for the relative permittivity of the mold compound in a coplanar waveguide (CPW) configuration, based on analytical expressions. Lastly, we compare the results extracted from both the T-resonator and transmission line (TL) structure. [ABSTRACT FROM PUBLISHER]

Published
2011
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47. Low standoff Chip to Wafer bonding.

Author

Ser Choong Chong, Wee, David Ho Soon, and Keng Hwa Teo

Abstract

Industry is moving towards having module with multiple functions and capabilities in order to satisfy consumer demands. Miniaturized the package will allowed more components to pack inside the electronic gadget. A low z-foot print of the package is one of the approaches to miniaturize the package. The adoption of micro-bump solders in the chip allowed low standoff Chip to Wafer (C2W) solder interconnects. The chip used in this study is of size 12mm × 12mm × 0.07mm and consists of array of micro-solder bumps at 80µm pitch and 50µm UBM diameter. The wafer is of 200mm diameter and 0.7mm thick. [ABSTRACT FROM PUBLISHER]

Published
2011
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48. Reader's Writes

Author

Smith, Brian, Van Der Wee, David, Golden, P.H., and Powis, Kevin

Abstract

Anyone using preprinted stationery in a laser printer should specify oil-based inks only. Inkorrect! With regard to Mr Ballance's letter concerning letterhead shadowing and the HP LaserJet 4 (issue 210), […]

Published
1993

50. PIV investigation of acoustic transmission through curved duct bends for the optimisation of thermoacoustic systems

Author

Wee, David Shuon Tzern

Subjects
Physics::Fluid Dynamics
Abstract

The efficiency of travelling wave thermoacoustic system, for a given operating temperature difference, is determined by the acoustic wave transmission through its feedback resonator loop system. Curved duct bends are one of the most repeated components used in the construct of these feedback resonator systems and thus require acoustic transmission optimisation. \ud This research investigates the transmission of low frequency, high amplitude acoustic waves propagating through duct bends with different radius of curvatures using Particle Image Velocimetry (PIV). The experimental PIV investigation was conducted on the axial plane of the bend. The velocity vector maps obtained from each run was analysed using both the newly developed Velocity based Wave Decomposition (VWD) technique as well as the Proper Orthogonal Decomposition (POD) technique. The POD technique was shown to successfully separate the different flow component of the acoustic wave in the respective Proper Orthogonal Modes (POMs). The acoustic transmission was thus computed based on the strength of these POMs. The POMs also allowed for the flow visualisation of the different loss mechanism that exists within the wave propagating through the bend (most notably, the energy cascade loss mechanism). \ud Based on the quantitative measurement of the acoustic transmission as well as the qualitative flow observation of the different loss mechanism, a non-dimensional parameter was developed in order to characterise the acoustic transmission through curved duct bend systems. This parameter is known as the Strouhal-Dean number. Based on this parameter, the acoustic transmission can be characterised into 3 acoustic flow regimes: Viscous dominated oscillation, Inertia dominated oscillation and the Transition regime between the first two oscillation regimes. The optimum acoustic transmission range corresponded to the transition regime where the inertia generated secondary circulation was balanced by its viscous loss suppression. The optimal Strouhal Dean number for acoustic transmission was found to be approximately 10.8.

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