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Novel fuzzy logic controllers with self-tuning capability
No full textTwo controllers which extend the PD+I fuzzy logic controller to deal with the plant having time varying nonlinear dynamics are proposed. The adaptation ability of the first self tuning PD+I fuzzy logic controller (STPD+I_31) is achieved by adjusting the output scaling factor automatically thereby contributing to significant improvement in performance. Second controller (STPD+I_9) is the simplified version of STPD+I_31 which is designed under the imposed constraint that allows only minimum number of rules in the rule bases. The proposed controllers are compared with two classical nonlinear controllers: the pole placement self tuning PID controller and sliding mode controller. All the controllers are applied to the two-links revolute robot for the tracking control. The tracking performance of STPD+I_31 and STPD+I_9 are much better than the pole placement self tuning PID controller during high speed motions while the performance are comparable at low and medium speed. In addition, STPD+I_31 and STPD+I_9 outperform sliding mode controller using same method of comparison study
Division and Unity: The History and Historiography of the Pennsylvania Constitution
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Wen Li Teng is pursuing a double major in History and Political Science at the University of Chicago
The Menkaure Triad, Numerical Thinking, and Divine Configurations in Ancient Egypt
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Formerly an undergraduate at the University of California, Los Angeles, Wen Li Teng is a transfer student at the University of Chicago. Wen Li is currently pursuing a major in History
Civilization and Nature: A Reading of Ancient Texts
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Hailing from Singapore, Wen Li Teng is a first-year student at the University of California, Los Angeles. She intends to declare a major in History
The Advances in Conversion Techniques in Triboelectric Energy Harvesting: A Review
No full textA triboelectric nanogenerator (TENG) is a new transducer utilizing contact electrification and electrostatic induction to transform mechanical energy into electric energy. Due to its high energy density and flexibility, it can be employed to make electronic devices self-powered by harvesting ambient mechanical energy in many application scenarios, such as biomedical devices, wearable electronics, and Internet-of-Things (IoT) sensors. However, due to the time-varying and low internal capacitance of a TENG, it is challenging to extract electrical energy from it. Hence, good power conversion techniques are crucial in TENG energy harvesting systems. Currently, studies on dedicated integrated power conversion techniques are very limited. Due to the exponentially increasing research interests in TENG, a comprehensive study on the TENG energy harvesting system, emphasizing integrated-circuit (IC) power conversion techniques, is urgently needed. This paper summarizes and compares the state-of-the-art triboelectric energy harvesting systems, focusing on different power conversion techniques for output power enhancement. Some techniques, which have been widely used in other relevant energy harvesting systems, are also mentioned to inspire innovative design strategies for TENG systems.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsElectronic Instrumentatio
A CRITICAL REVIEW ON THE MATERIAL ASPECTS OF TRIBOELECTRIC NANOGENERATORS (TENG)
Get PDFTriboelectric nanogenerators (TENG) take the advantage of coupling effect for harvesting energy in the area of electronics for various self-powered applications. These nanogenerators are capable of converting energy in our surroundings into electrical energy by using the process of electrostatic induction and contact electrification. Triboelectric layers of a TENG are formed basically with the use of various polymers, metals and other inorganic materials like PTFE (Poly tetra fluoro ethylene), PDMS (polydimethyl siloxane), FEP (Fluorinated ethylene propylene) and Kapton. Selection of different materials for the device fabrication is very important since it contribute towards the triboelectric effect and also forms the fundamental structure for the proposed TENG device. In this review article, we emphasis mainly on various triboelectric materials considering factors such as stability, flexibility, power density etc., to improve upon the electrical output of the devices for different applications
[[alternative]]Semantics and Pedagogical Grammar of verb-particles in Modern Chinese
No full text[[abstract]]This thesis intends to analyze and sub-divide nine verb-particles in Modern Chinese. Teng (1977) first pointed out the core meanings of verb-particles and established the framework of verb-particles in Chinese. When “上(shang4)、下(xia4)、起(qi3)、出(chu1)、開(kai1)、到(dao4)、走(zou3)、掉(diao4)、住(zhu4) ” are placed after verbs and their semantics have grammaticalized, they present the force from motion-through-location. Furthermore, as the meanings of verb-particles are varied and indistinct, it is very difficult for learners to distinguish nuances of each one. According to Bolinger (1971), the semantics of a verb-particle derive from the original meanings of the word and are limited by both verbs and objects. After sub-dividing the nine verb-particles, this thesis seeks to establish some principles for the pedagogical grammar of verb-particles in Modern Chinese and suggests some ideas for teaching.
Evaluation of oxygen bomb methodology for studying frying chemistry
No full textOxipresTM oxygen bomb instrumentation was evaluated for measuring oxygen consumption in studying reactions of food oils at frying temperatures. High oleic sunflower oil:corn oil blends (60:40 w/w) were heated in OxipresTM cells over a range of temperatures from 100 to 180 °C under different gases and pressures. Effects of sample size, temperature, pressure, pressurizing gas, heating time, mixing, and oil characteristics were determined. Conjugated dienes, peroxide values, aldehydes, and free fatty acids were measured to relate oxygen consumption curves to other chemical changes during lipid oxidation. At 150 °C and above, oxygen consumption exhibited no induction periods and did not follow Arrhenius kinetics. Curves showed an initial pressure increase associated with oil heating, followed by a period of rapid decline, then a slowing in pressure decrease with continued heating. Limitations of oxygen diffusion may contribute to but do not fully explain this decreasing reactivity. Oxygen consumption rates and net uptake increased with headspace oxygen concentration (2, 5, 20, and 100%) and pressure (0.5 to 5 bars). The system accurately differentiated oxidation sensitivity of oils with different degrees of unsaturation with high reproducibility (average variation 2.27%). Oxygen consumption correlated with aldehyde oxidation products, particularly under high oxygen, but not conjugated dienes or hydroperoxides. Patterns of volatile products collected by short path thermal ii desorption tubes connected to Oxipres cells showed a homologous series of C2-C12 alkanes, alkenes, fatty acids, and aldehydes. These products are more consistent with thermal scission reactions than lipid autoxidation initiated by pre-formed hydroperoxides. Overall, the Oxipres system provides very stable, sensitive control of pressure and temperature, but three modifications would improve its design. At frying temperatures, headspace pressure reflects oxygen consumption balanced against release of volatile products and oxygen produced in reactions. Replacing the current pressure transducer with an oxygen-specific sensor would eliminate complications from volatile products. The closed system with slow eddy currents in the oil is a useful research tool but does not accurately model real-life frying. Addition of a stirring mechanism would facilitate oxygen diffusion. Finally, a thermocouple to monitor the actual oil temperature and rates of heating would be very useful.M.S.Includes bibliographical referencesby Teng Pen
ANALISIS PELAFALAN KARAKTER “DE” DALAM LAGU MANDARIN YANG DINYANYIKAN OLEH TERESA TENG
Get PDFFrom the previous research entitled “Analisis Pelafalan Karakter ? dalam Kumpulan Lagu Terbaik yang Dinyanyikan oleh Andy Lau”, it was found that the pronunciation of the characters ? changes variously into [t?] and [ti], which is caused by two factors, namely the position of the tongue (the rise and fall of the tongue), and factors of high and low tones. This study is a qualitative one aiming at describing the pronunciation of the character ?“DE” in the Chinese songs sung by Teresa Teng. In this study, the author took data from the songs sung by Teresa Teng, one of the legendary singers from Taiwan. In the songs, there is a phenomenon that is similar to what happened in the songs sung by Andy Lau, namely a change in the pronunciation of the characters ? was pronounced into [ti]. A professional singer certainly would apply the technique of good improvisation, to create harmonization between the tone and the lyrics of the song. This study used grammatical and phonological review to assess what kind of character ? pronunciation in the songs sung by Teresa Teng, then examined the factors that affect the pronunciation of the characters ?. The result showed that out of 22 samples taken from 10 songs sung by Teresa Teng, there is only one case that the character ?“DE” was pronounced into [t?], while the other 21 sampes were pronounced into [ti]. Compared to the previous research, it can be said that the position of the tongue and high and low tones don’t give the significant effect to the pronounciation of the character ?
Gate-to-grave assessment of plastic from recycling to manufacturing of TENG: a comparison between India and Singapore
Get PDF\ua9 The Author(s) 2024. This study assesses the viability of recycled plastic-based triboelectric nanogenerators (TENGs) for sustainable energy harvesting in India and Singapore, concurrently examining plastic waste management. Using material flow analysis and life cycle assessment, the findings revealed that in Singapore, waste-to-energy incineration has a lower environmental impact than landfilling and mechanical recycling, attributed to natural gas usage. In India, recycling offsets impacts from incineration and landfilling, contributing to a lower net environmental impact. Economic performance of a TENG module from PET recyclates showed a 20% carbon footprint reduction when scaling up from lab to industrial “freeze-drying” processes. Key challenges in TENG manufacturing processes are also assessed for future development. This research highlights the potential of recycled plastic-based TENGs in sustainable energy and waste management
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