17,031 research outputs found
Online Iterative Adaptive Dynamic Programming Approach for Solving the Zero-Sum Game for Nonlinear Continuous-Time Systems with Partially Unknown Dynamics
No full textThe current study presents an online iterative adaptive dynamic programming approach to resolve the zero-sum game (ZSG) for nonlinear continuous-time (CT) systems containing a partially unknown dynamic. The Hamilton-Jacobian-Issacs (HJI) equation is solved along the state trajectory according to the value function approximation and the policy improvement online. Relaxed dynamic programming is utilized to ensure the algorithm’s convergence. Model and costate networks were established to conduct the method. Computational simulations are performed to present the efficiency of the algorithm.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.Control & Simulatio
Condition Monitoring and Fault Detection of Suspension Components in Freight Wagons Using Acceleration Measurements
No full textExploring the moderators and causal process of trust transfer in online-to-offline commerce
No full textThis study attempted to explore the boundary conditions of trust transfer in the online-to-offline commerce context, which is overlooked in prior research. In Study 1, cross-sectional data were collected from 417 consumers to examine the research model. In Study 2, to confirm causality of trust transfer, longitudinal data were collected and analyzed using a cross-lagged panel model. Results indicated that trust in the intermediary platform positively influences trust in the user community, which further positively influences trust in the focal merchant. Perceived effectiveness of dispute resolution strengthens the impact of trust in the intermediary platform on trust in the focal merchant, while perceived effectiveness of the feedback mechanisms strengthens the impact of trust in the user community on trust in the focal merchant. From a theoretical perspective, this study extends insights into trust transfer theory by identifying the boundary conditions of trust transfer. From a practical perspective, it informs intermediary platforms on how to manage dispute resolution and feedback mechanisms effectively to succeed in online-to-offline commerce. It also helps merchants in selecting the most effective intermediary platforms with which to cooperate
su-Based Shaft Friction Design Method and Evaluation for Pipe Pile
No full textThe shaft friction in clay is essential to bearing capacity of pipe piles. Reasonable selection of design methods and parameters is very important for offshore piles. This paper focuses on the current popular vertical load design methods based on undrained strength for pipe piles, especially for offshore piles. Based on the database, the accuracy and reliability of various pile design methods based on undrained strength su in clay were reviewed. The small-scale model tests were conducted to evaluate su-based methods. For the shortcomings of small-diameter piles in the database, a field test of full-scale offshore pile was carried out and analysed. By comparing the calculated and the measured capacity for each method, the reliability of various design methods is evaluated for large-diameter piles. For the design methods based on undrained strength, it demonstrates the importance and reliability of the determination of undrained strength parameters. In view of the vertical loading conditions of offshore large-diameter steel pipe piles, reasonable suggestions for design methods and parameters determination are given
Hai bin yu fu.
No full text什之譯.本電子書乃根據《香港版權條例(第528章)》而複製, 並只可在大學圖書館系統內的獨立電子書系統上使用.Shizhi yi.Ben dian zi shu nai gen ju "Xianggang ban quan tiao li (Di 528 zhang)" er fu zhi, bing zhi ke zai da xue tu shu guan xi tong nei de du li dian zi shu xi tong shang shi yong
Fu Describing About the Author Himself: A Focus on Ban Gu "You tong fu"
No full textFrom Later Han dynasty onwards, the number of fu describing about the author himself has increased. There are several possible reasons for this, but the most important reason is probably that there was no other genre through which one could express oneself except for fu in this period. For instance, the fiveword poetry was still in the middle way of establishing its own style at that moment. Moreover, in Former Han, there were few opportunities for authors to talk about themselves in detail in fu, because the main readers were emperors and kings of countries. In Later Han, the readers had become more diverse. That is probably the reason why more fu began to mention about the authors themselves in this period. Ban Gu (32-92), who is a representative scholar of Later Han and also a man of letters, expressed his aim by writing "You tong fu". Its main content is that though one's encounter with a disaster or felicity is not always derived from our behavior, we have to have a strong will and take action to overcome disasters. This idea is supported by Ban Gu's experiences of not attaining his aim. Such experiences are common in Chinese authors. One of the earliest examples is Chu Ci. Also, Chu Ci is the one of the origins of fu. It is surprising that authors expressed things about themselves mostly in fu describing journeys. It may be easier to understand this tendency if we think they substituted the heaven wander in Chu Ci with a ground journey. Chu Ci was a model for authors to express their aim which could not come true, even if the journey on the ground and the wander in heaven are different
Notes on Prosthecarthron Raffray, with description of P. insulanus, sp. n. (Coleoptera, Staphylinidae, Pselaphinae) from Qi'ao Island, South China
No full textYin, Zi-Wei, Huang, Shao-Bin, Gu, Fu-Kang (2012): Notes on Prosthecarthron Raffray, with description of P. insulanus, sp. n. (Coleoptera, Staphylinidae, Pselaphinae) from Qi'ao Island, South China. Zootaxa 3530: 83-88, DOI: 10.5281/zenodo.21204
NILAI-NILAI PENDIDIKAN ISLAM DALAM KITAB AL- MAWA>‘IZ{ AL-‘US}FU>RIYYAH SYEIKH MUH}AMMAD BIN ABU BAKAR AL-‘US}FU>RI
No full textNilai-nilai pendidikan Islam merupakan segala hal yang mengandung unsur positif yang
berguna bagi manusia berupa aturan dan norma yang ada pada pendidikan Islam,
diantaranya meliputi akhlak, akidah dan ibadah. Kitab al-mawa>‘iz{ al-‘us}fu>riyyah adalah
kumpulan cerita yang dilengkapi dengan hadis, yang dikarang oleh syeikh muh}ammad bin
abu bakar al-‘us}fu>ri. Penulis tertarik dengan isi kitab tersebut guna untuk digali nilai-nilai
pendidikan Islamnya.
Tujuan penelitian ini adalah untuk mendiskripsikan nilai-nilai pendidikan Islam di dalam
kitab tersebut dan untuk mendiskripsikan relevansinya terhadap pendidikan Islam.
Jenis penelitian ini adalah penelitian pustaka (library reseach) dengan metode analisi isi
(content analysis) dan pendekatan yang dipakai menggunakan pendekatan deskriptif.
Hasil penelitian ini menunjukkan terdapat tiga nilai-nilai pendidikan Islam di dalam kitab
tersebut, meliputi: nilai akhlak (akhlak kepada makhluk lain, kepada masyarakat, kepada
Allah dan kepada diri sendiri), nilai akidah (keimanan kepada Allah dan rasul) dan nilai
ibadah (ibadah gairu mahdah)
Impacts of vehicle light-weighting on wheel wear and RCF and a novel ultralight vehicle design
No full textVehicle light-weighting is a critical design target for rail vehicles, as it reduces energy consumption and enhances the vehicle capacity and dynamic performance, making the railway system more attractive in addressing the rising environmental challenges and increasing demand in transportation. This paper presents a quantitative analysis of the impact of vehicle light-weighting on wheel wear and rolling contact fatigue (RCF), using the USFD wear law, the shakedown map and the T gamma approach. A conventional metro vehicle is utilized as a baseline model, and the mass reductions from different vehicle components (i.e., car-body, bogie frame and wheelset) are implemented for the simulation considering various running scenarios. The effect of mass reduction on wheel wear can be divided into two aspects: quasi-static wheel load and wheel-rail dynamic interaction. In short-radius curves, the change in static axle-load predominantly determines wheel wear, whereas in large-radius curves and tangent track, the wheel-rail dynamic interaction plays an important role, thus showing different rates of wear reduction when mass reduction is achieved respectively from car-body, bogie frames and wheelsets. Reducing vehicle mass can significantly reduce wheel damage of RCF on short-radius curves with curve radii above 400 m, while there is a risk of increasing RCF on tight curve R250, due to the impaired function of wear to counteract the crack propagation. This work also exhibits a specific innovative ultralight vehicle design, where the liner synchronous motor technology is applied to reduce substantially the mass of the vehicle without impairing the capability to provide the required amount of tractive effort. The proposed ultralight vehicle can reduce the wheel wear by approximately 40% and shows substantial benefit for preventing RCF damage, compared to a conventional vehicle
含软弱夹层的强风化泥岩强度及破坏模式试验研究
No full textIn order to investigate the effects of weak interlayer on slope instability, theoretical and experimental studies on the strength and the failure mode of rock containing weak interlayer were conducted. Three types of triaxial specimens of strongly weathered mudstone, muddied interlayer, and mudstone with the weak interlayer were prepared by using the core specimens of a slope borehole, and the triaxial consolidation undrained shear tests were conducted, respectively. Combined with the theoretical analysis, the strengths and failure modes of the strongly weathered mudstone, the muddied interlayer and the mudstone with weak interlayer were studied, and the influence laws of the interlayer angle and the confining pressure on the strengths and failure modes of specimens were revealed. The results show that the stress-strain curves of the strongly weathered mudstone and the muddied interlayer are strain-softening type and strain-hardening type, respectively. There exists a critical inclination angle range for specimens containing the weak interlayer. When the interlayer angle is within the range, the failure surface occurs in the weak interlayer. When the interlayer angle is outside the range, specimens undergo global shear damage. When the confining pressure exceeds 0.4 MPa, the confining pressure has no effect on the failure mode of specimens containing the weak interlayer.</p
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