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Autonomous Vehicles: Autodriver Algorithm and Vehicle Dynamics
Get PDFA given road can be expressed mathematically in a global (or world) coordinate frame. Following the road can be substituted by following the loci of its curvature center and turning at the right circle of curvature. Considering that a vehicle in motion is always in turn about an instantaneous rotation center relative to the ground, an autonomous vehicle capable of following a given path by coinciding the rotation center of vehicle at every moment on the curvature center of the road could be designed. The dynamic reactions of the vehicle influence its path of motion and make its rotation center to depart from the desired path of the curvature center of the road. In this study, the Autodriver algorithm control strategy to front-wheel-steering vehicles has been developed and a control loop is introduced to compensate the present errors generated by the differences of the desired locating on the road and the real position of the vehicle
Discussion on Seismic Performance of Non-Seismically Designed Structures
No full textThis article briefly reviews the critical construction practices which were widely adopted for existing building structures in low to moderate seismic regions. The corresponding effect to seismic performance is discussed and it is concluded that further study is required to retrofit existing buildings which are without seismic considerations
Fragility curves for buildings in Hong Kong
Get PDFFragility curves are the tools for evaluating the damage of structural or nonstructural components under different levels of ground excitation. It is also the necessary information for calculating the life-cycle cost of buildings during their design period. In this paper, development of fragility curves for buildings designed based on HK standard is presented. Two prototype models, which include three-storey and tenstorey reinforced concrete rigid frames, were considered. Incremental dynamic analysis was conducted under nine sets of past earthquake records with scaled peak ground accelerations. Maximum inter-storey drift ratio was selected as the damage indices and three performance levels were considered. Based on the numerical results, two fragility curves were developed to quantify the damage probability of RC buildings with different building heights
Recent Advancement in Lignin Biorefinery: with Special Focus on Enzymatic Degradation and Valorization
No full textWith the intensive development of lignocellulosic biorefineries to produce fuels and chemicals from biomass-derived carbohydrates, lignin was generated at a large quantity every year. Therefore, lignin has received increasing attention as an abundant aromatics resource in terms of research and development efforts for value-added chemicals production. In this review, studies about lignin degradation especially the crucial enzymes involved and the reaction mechanism were substantially discussed, which provided the molecular basis of lignin biodegradation. Then, the latest improvements in lignin valorization by biological methods were summarized and case studies about value-added compounds from lignin were introduced. Afterwards, challenges, opportunities and prospects regarding biorefinery of lignin were presented
Applying Metacognition Techniques in Improving Communication-based Module Learning Outcomes
No full textNatural Selection 天擇之糧
Get PDFThree basic raw ingredients. The magic and mystery of microorganisms. Time-honoured techniques. It\u27s no wonder that the world is going wild for authentic, artisanal bread.
三種基本原料、奇妙而神秘的微生物、歷史悠久的方法…… 無怪乎大家都對傳統手工麵包趨之若鶩
Global Perspectives: Workforce trends and strategies for Industry 4.0 (Panel)
No full textThe World Economic Forum’s The Future of Jobs Report (2018) presents the trends across employment, skills and human capital investment across industries and geographies while the Readiness for the Future of Production Report (2018), assesses how well-positioned global economies are to share and benefit from changes in production being driven by the 4th Industrial revolution. Country representatives share the drivers and shifts in policy settings occurring in their country in response to rapid technological shifts, cultural globalization and increasing competitiveness in the global economy to prepare for the future
