398 research outputs found
Fo jiao zong pai xiang zhu / Yang Wenhui zhuan ; Wan Jun zhu 佛教宗派詳注 / 楊文會撰 ; 萬鈞注
No full textWuxi Ding shi zang ban 無錫丁氏藏
Enhancement of third-order optical nonlinearities by conjugated polymer-bonded carbon nanotubes
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Wei Feng, Wenhui Yi, Hongcai Wu, Masanori Ozaki, and Katsumi Yoshino, J. Appl. Phys. 98, 034301 (2005) and may be found at https://doi.org/10.1063/1.1954887.Third-order nonlinear susceptibility χ(3) and second-order hyperpolarizability γ of poly{[3-octylthiophene-2,5-diyl]-[p-aminobenzylidenequinomethane]-bonded multiwalled carbon nanotubes (POTABQ-MWNTs) were measured in chloroform solution using degenerate four-wave mixing at 532nm under nanosecond pulse excitation. Effective nonlinear absorption coefficient βeff and nonlinear refraction index n2 were obtained using open aperture and close aperture Z-scan technique at the same wavelength, respectively. Optical limiting property of the sample was also investigated. The resulting POTABQ-MWNTs exhibited large third-order nonlinear optical responses mainly due to the formation of intramolecular photoinduced charge-transfer system of polymers and carbon nanotubes
First principles study of lithium insertion in bulk silicon
No full textSi is an important anode material for the next generation of Li ion batteries. Here the energetics and dynamics of Li atoms in bulk Si have been studied at different Li concentrations on the basis of first principles calculations. It is found that Li prefers to occupy an interstitial site as a shallow donor rather than a substitutional site. The most stable position is the tetrahedral (T(d)) site. The diffusion of a Li atom in the Si lattice is through a T(d)-Hex-T(d) trajectory, where the Hex site is the hexagonal transition site with an energy barrier of 0.58 eV. We have also systematically studied the local structural transition of a Li(x)Si alloy with x varying from 0 to 0.25. At low doping concentration (x = 0-0.125), Li atoms prefer to be separated from each other, resulting in a homogeneous doping distribution. Starting from x = 0.125, Li atoms tend to form clusters induced by a lattice distortion with frequent breaking and reforming of Si-Si bonds. When x >= 0.1875, Li atoms will break some Si-Si bonds permanently, which results in dangling bonds. These dangling bonds create negatively charged zones, which is the main driving force for Li atom clustering at high doping concentration.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000282227500006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, Condensed MatterSCI(E)EI67ARTICLE41null2
How the conceptions of Chinese rhetorical expressions are derived from the corresponding generic sentences
No full textThe effect of the electron-phonon coupling on the thermal conductivity of silicon nanowires
No full textThe thermal conductivity of free-standing silicon nanowires (SiNWs) with diameters from 1-3 nm has been studied by using the one-dimensional Boltzmann's transport equation. Our model explicitly accounts for the Umklapp scattering process and electron-phonon coupling effects in the calculation of the phonon scattering rates. The role of the electron-phonon coupling in the heat transport is relatively small for large silicon nanowires. It is found that the effect of the electron-phonon coupling on the thermal conduction is enhanced as the diameter of the silicon nanowires decreases. Electrons in the conduction band scatter low-energy phonons effectively where surface modes dominate, resulting in a smaller thermal conductivity. Neglecting the electron-phonon coupling leads to overestimation of the thermal transport for ultra-thin SiNWs. The detailed study of the phonon density of states from the surface atoms and central atoms shows a better understanding of the nontrivial size dependence of the heat transport in silicon nanowire.Physics, Condensed MatterSCI(E)EI0ARTICLE29null2
Discussion about the Pros and Cons and Recommendations for Multimedia Teaching in Local Vocational Schools
No full textAbstractGlobalization is an inevitable developing trend of multimedia network teaching. In our contemporary society, the world has connected by internet; it is incredible that people can not use the boundless information through campus network, multimedia classroom or single multimedia computer with out connecting the WAN. The new internet based teaching method breaking the constrains of the limited resources, distance and size of the LAN, bringing multimedia network teaching method to the world. “Open University”, “Virtual Schools”, “Global Classroom” and a number of new teaching systems merged rapidly
Xianggang zhong xue sheng dui xiao nei wei gui xing wei de hui ying
No full text日常生活中，個人的道德判斷與道德行動時有不一致，這正是道德運作中的一道縫隙。本研究嘗試以香港中學生為研究對象，藉著學生面對校內違規行為的真實經驗，了解他們對違規行為的觀感、回應及採取行動的抉擇因素；進而探討道德動機在道德思考到行動中的作用，並建構學生採取道德行動的抉擇過程。研究採用質性方法，參與深度訪談的共有十三位中學生，都是來自第一組別中學的品行優良生。受訪學生對違規行為的觀感源自其選擇的視點，而回應則按情況而定；視點主要有行為、意圖和違規後果等，而學生在一般情況下，大都願意直接指正、規勸違規同學；但在兩難情況下，大多想逃避過去，對違規行為不作正面回應。至於採取行動的抉擇因素，主要有人際關係、違規行為帶來的影響及違規學生的態度等；而最重要的人際關係因素則包括與違規學生的關係、輿論壓力。本研究的結果和分析，不僅較整全地呈現從思考到行動的道德運作中，一些細節和關鍵因素；還可為華人道德研究及學校道德教育提供參考。最後，本文就道德的相關研究及學校的道德培育提出一些建議，盼能有助理論研究及教育工作的推進。Almost every day, a person's moral judgment and moral actions may contradict with each other, reflecting a possible gap in moral functioning. This research attempts to study some discrepancies between moral judgment and moral actions. Thirteen Hong Kong secondary school students participated in this study, in which their past encounters with their fellow students who had violated the school rules were examined. These included the students’ perspective on the violations, the factors that contributed to their decision-making process as to how to react, and their actual reactions. This study also aims to explore into the students’ moral thinking process, especially the impact of moral motives on students’ moral judgment and how this influenced their actual actions.Using a qualitative study approach, data were collected from thirteen exemplary secondary school students from a top-banding school in Hong Kong. In-depth interviews were conducted with each of these students. The results of data analysis suggest that the students perceived the violating actions according to the violator’s behaviour, intention and the consequences. The majority of these students were often willing to voice out the violations and correct the violator’s behaviour. However, when they were placed in a dilemma, the majority of the students would escape from the situation by turning a blind eye on the violating actions. Factors which affected the decision of whether an action should be taken included social relations, the impact of the violation and the attitude of the violator. Among these factors, the most important one was social relations which was about the students’ personal relationship with the violator and peer pressure. The results of the study not only reflected the cognitive processes behind moral functioning from moral judgment to moral action, also revealed the key factors behind the moral decisions. This study has important implications for further research and practice in that it provides a direction for moral studies, especially in Chinese communities, and gives practical suggestions as to how moral functioning can be taught in secondary schools.Detailed summary in vernacular field only.Detailed summary in vernacular field only.鄺文慧 = From moral thinking to moral action : an investigation of how secondary students in Hong Kong respond to rule-breaking behaviors / Kwong Man Wai.Thesis (Ed.D.) Chinese University of Hong Kong, 2014.Includes bibliographical references (leaves 145-154).Abstracts also in English.Kuang Wenhui = From moral thinking to moral action : an investigation of how secondary students in Hong Kong respond to rule-breaking behaviors / Kwong Man Wai
Introducing a circular construction hub for building material circularity in city: A case study in Leiden, the Netherlands
No full textThe Dutch government has published the circular economy goal, which aims to reduce 50% consumption of raw materials by 2030 and realize full circularity by 2050. The goal leads the promotion of the sustainability development, particularly, on improving the resilience of the self-sufficient material supply chain in the Dutch economy. As one of the largest raw material consumers, the construction sector has urgent demand on the solution towards building circularity, which mainly indicates as increasing the use of secondary materials, and reducing the demolition and construction waste. Accordingly, the municipality of Leiden takes the leading role of circular transition, and seeks for the practical solution in construction sector at the local scale.The circular construction hub is brought out as an effective solution to the building material circularity transition. A series conceptual development and a few pilot projects in Utrecht and Amsterdam were established, the effectiveness is proved by the promising results of transportation reduction, and recycling rate improvement. Regardless numbers of the studies on the building material flow analysis and the development of the hubs in various forms, limited discussion of practical information for local hubs’ development is provided, and little quantitative analysis of the implementation of the circular construction hub was conducted. Decision making for the intermediate steps in the transition towards building material circularity, therefore, has little referencing information.Hence, this research proposes the main research question as: How will the circular construction hub support the transition of building material circularity in the cities of the Netherlands? In order to explore the formation and the influence of the circular construction hub in city with the case study of Leiden. The research firstly specifies the formation of the hub by desk research; then quantifies the urban mining potential and handling capacity of the hub by Material Flow Analysis (MFA); then the suitability analysis of the hub’s location is provided by the Geographical Information System (GIS) based on the transportation emission (CO2 eq kg). The research aims to draw a comprehensive understanding on the metabolic characteristics of building material flows with implementation of the circular construction hub, and provide a referencing value for municipality’s decision making on developing the hub in city Leiden, and further development in the cities of the Netherlands. Industrial Ecolog
Evaluating the Effect of Data Drift on Model Performance
No full textData drift refers to the variation in the production data compare to the training data and sometimes the machine learning model would decay because of it. Some machine learning models face the problem when in production: they receive drift data while there’s no ground truth to evaluate model performance, thus no way of determining the effectiveness of the model. Most of the previous researchers either detect drift in a statistical way and don’t look into the meanings of the drift, or require ground truth when it’s often not possible.In this research, we work with the inland shipping model from ILT, which is a random forest model that is used to predict whether a ship is likely to violate certain regulations. We are given an out-of-sample set, which contains ships that the inland shipping model can predict but with no labels, so no ground truth to validate. We aim to evaluate the effect of possible data drift of the out-of-sample set on model performance. We propose a novel framework that first takes advantage of expert knowledge to decide drift groups with real meanings; then, we apply pseudo labeling, a mechanism that can create approximate labels for the unlabeled data; finally, we use the pseudo-labeled data to evaluate model performance. Our work shows a possible way when facing the common data drift problem and no ground truth problem for a real dataset in a production environment
Final report on industrial orientation with Turbine Overhaul Services Pte Ltd
No full textThis report presents the summary of the author's experience during the 10 week duration as an Industrial Orientation student at Turbine Overhaul Services (TOS) Private Limited, under the Repair Development Engineering / Special Processes (RDE/SP) Department. The author worked together with and supported the engineers of TOS RDE/SP to design and produce laser cladding and welding operations.
The report first introduces the overview of TOS as a company and its mission and operation. The objectives and purpose of the department as well as the explanation of the work produced by the author were discussed.
The main project that the author was involved in is the development of qualified laser operations process for the repair of the company‟s components. It involves experiments which were aimed to investigate the causes of defects during and after welding. Furthermore, it involves all stages of development before it can be used in the production line. With the knowledge and insights gained from the experiments, actions may be undertaken to prevent these defects. Subsequently, the author will be able to optimize the various parameters for the laser process.
In addition, the author was responsible for communicating and working together with the technicians who will be using these laser processes during production.
Being part of the RDE/SP team, certain information and technical data has to be kept confidential and thus, only the general summary of the studies and results are being disclosed in this report
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