37,011 research outputs found
Using performance assessment in secondary school mathematics: an empirical study in a Singapore classroom
No full textThis article reports an exploratory study on using performance assessment in mathematics instruction in a high-performing secondary school in Singapore. An intact mathematics class participated in the study, and received chapter-based performance tasks as intervention during regular mathematics lessons for about one and a half school years. The performance tasks used included authentic and/or open-ended tasks. The students’ academic achievements and attitudes in mathematics were compared with a comparison class that did not receive the intervention. Both quantitative and qualitative data were collected, mainly through questionnaire surveys, performance task tests, conventional school exams, and interviews with students and teachers. The results suggest that the students receiving the intervention performed significantly better than their counterparts in solving conventional exam problems, and in general they also showed more positive changes in attitudes towards mathematics and mathematics learning. The students from the experimental class also expressed positive views about the benefits of using performance tasks in promoting their ability in higher order thinking, though no statistically significant difference was detected between the two classes of students in solving unconventional tasks before and after intervention. Overall, the results appear to support teachers’ using contextualised problems in real life situations and open-ended investigations in students’ learning of mathematic
Richardson, Barbauld, and the construction of an early modern fan club
No full textMPhilMuch has been written about the life and long works of the eighteenth century epistolary novelist, Samuel Richardson, but the prospect of his position as the first celebrity novelist – responsible for courting his own fame as well as initiating his own fan club – has largely been ignored. The body of manuscripts housed at the National Art Library in the Victoria and Albert Museum in London provides the modern scholar with evidence of the skeletal beginnings of an early fan club. This thesis aims to show how these manuscripts were turned into a saleable commodity by the publisher and entrepreneur Richard Phillips, while under the guiding hand of another, slightly later, literary celebrity, Anna Laetitia Barbauld. In order to restore Richardson’s reputation amongst a new nineteenth century audience, Barbauld was required to construct her own idea of him as an eighteenth century celebrity author, and in doing so the insecurities of a self-professed, apparently diffident man, are revealed. Barbauld’s capacious, but heavily edited selection of letters is analyzed in this thesis, providing ample evidence that Richardson’s correspondents were more than just eager letter writers. By using Barbauld’s biography of Richardson this thesis aims to show how she manipulates the genre of life writing in her construction of him.
This thesis offers an alternative reading of how the Richardson manuscripts are viewed, redefining them as not simply a collection of letters, but as a collective entity, deliberately selected and archived as evidence of an early modern fan club, and its celebrity managing director
杏元和番 = Xingyuan he fan
No full textOn double leaves, oriental styleCover titleHarry Simon Collection[成都] : 和記書莊印, [19--?]At head of title : 重台 = Chong taiRunning title : 杏元和番 = Xingyuan he fa
Art Forum - Wang Fan, Doug
No full text29 August 2002. -- Dong Wang Fan is a renowned artist who has exhibited and been collected internationally. His painting practice examines the similarities/differences between Australian and Chinese culture. He is one of a group of painters included in the exhibition Shanghai Star, currently on at the Tuggeranong Arts Centre. Dong Wang Fan will discuss the work in this exhibition
Development of a rotor model for the numerical simulation of helicopter exterior flow-fields
No full textIncludes bibliographical references (leaves 84-85).A numerical methodology is developed to model the effect of a rotor on the surrounding flow-field. The model calculates the time-averaged aerodynamic forces exerted on the air by the fan blades within the blade-swept region, and permits the user to specify blade properties such as cross-sectional profile and orientation at a particular radial and azimuthal location. The calculated forces are included as source terms within the Reynolds-averaged Navier-Stokes equations for an incompressible fluid, which are solved by the commercial CFD solver, FLUENT. The effects of turbulence are incorporated through the use of Launder and Spalding's k-g turbulence model. This method is selected as being the most efficient use of the resources available, giving the economic advantages of a steady simulation, while allowing radial and azimuthal variations of rotor characteristics. In order to validate the accuracy of the numerical model for both aligned and non-aligned inflow conditions, results are compared with experimental data reported for an axial flow fan. Agreement between experimental and numerical results is excellent to good. Fan static pressure rise is closely predicted by the numerical solution, while fan power consumption and fan static efficiency are under and over-predicted respectively. This error may be attributed to frictional losses not accounted for in the numerical model. These include physical rotational instabilities, leading to increased mechanical losses, and tip effects due to the clearance between the fan blade tips and the fan casing. Trends are nevertheless consistently predicted by the numerical model for inflow angles up to 45°, and for the range of blade pitch settings used. The adverse effect of off-axis inflow on the fan static pressure rise is numerically predicted, while fan power consumption is found to remain independent of inflow angle, as had been experimentally observed. The rotor model is finally integrated with the fuselage of the CIRSTEL (Combined Infra-Red Suppression and Tail rotor Elimination) prototype in an analysis of the helicopter exterior flow-field. No experimental data for this configuration was available for validation purposes. However, the model is used in the simulation of several common helicopter flight conditions. Results are presented graphically, and generally indicate good agreement with physically observed phenomena
A scholarly catalogue raisonné: George Wilson and the engraved fan leaf design 1795-1801
No full textABSTRACT
This research thesis offers a small but comprehensive scholarly catalogue raisonné of the surviving unmounted fan leaves designed and printed by the late eighteenth-century English fan leaf engraver, George Wilson (active before 1795-after 1801). Wilson’s extant output of nineteen fan leaf engravings published in London now exist in storage within the Prints and Drawing Department of the British Museum, after the receipt of two bequests from Lady Charlotte Schreiber (1812-1895) in the late nineteenth century. The individual fan leaf designs discussed in this catalogue raisonné include a number of reprinted fan leaves from the same engraving design.
There follows a chronological catalogue listing, and discussion of, all the different fan leaves designed by Wilson, collected by Lady Schreiber and subsequently bequeathed to the British Museum. The variety of subject matter depicted on these fan leaf designs underscore the differing types of themes Wilson engaged with in his engraved production. Analysis of the three main areas of Wilson’s fan leaf design work, female ‘advisory’ fan leaves, overtly satirical, and nationalistic fan leaves, reveal that Wilson’s fan leaf imagery engaged, to a great extent, with cultural concerns about the turbulences of late eighteenth-century life in London, as well as effectively modernising aesthetic precedents and contemporary graphic design. In particular, it becomes apparent that Wilson’s fan leaves effectively engage with late eighteenth-century feminine pre-occupations of choosing the right moral path to happiness, moderation in daily life, marriage and bearing children, in addition to illustrating the perceived multitude of follies translated from contemporary literary and pictorial sources. One of the predominant concerns in his catalogue of work is revealed to be the age old theme of the cycle of birth, reproduction and death, alongside a sustained pictorial focus upon feminine concerns and pre-occupations
Leveraging Deep Reinforcement Learning With Attention Mechanism for Virtual Network Function Placement and Routing
No full textThe efficacy of Network Function Virtualization (NFV) depends critically on (1) where the virtual network functions (VNFs) are placed and (2) how the traffic is routed. Unfortunately, these aspects are not easily optimized, especially under time-varying network states with different QoS requirements. Given the importance of NFV, many approaches have been proposed to solve the VNF placement and Service Function Chaining (SFC) routing problem. However, those prior approaches mainly assume that the network state is static and known, disregarding dynamic network variations. To bridge that gap, we leverage Markov Decision Process (MDP) to model the dynamic network state transitions. To jointly minimize the delay and cost of NFV providers and maximize the revenue, we first devise a customized Deep Reinforcement Learning (DRL) algorithm for the VNF placement problem. The algorithm uses the attention mechanism to ascertain smooth network behavior within the general framework of network utility maximization (NUM). We then propose attention mechanism-based DRL algorithm for the SFC routing problem, which is to find the path to deliver traffic for the VNFs placed on different nodes. The simulation results show that our proposed algorithms outperform the state-of-the-art algorithms in terms of network utility, delay, cost, and acceptance ratio
Application of computational fluid dynamics to turbo machinery unsteady aerodynamics and aero acoustics
No full textThe aim of this thesis is to obtain numerical data for fan tone noise propagation and reducing the load from blade-tower interaction. By using a CFD code, MB3D, which is supplied by Professor Li He, fan tone noise transmission and wind turbine blade-tower interaction are simulated and analysed. CFD application on turbomachinery unsteady flow is introduced and the two issues, fan tone noise and wind turbine have been reviewed. The CFD code to simulate the two different problems is introduced and its computational methodology is described. By using CFD method, the sound wave transmission in cut-on and cut-off situations are simulated and analysed. The results show that when the disturbance frequency is above the cut-off frequency, the pressure wave can propagate along the duct, when the disturbance frequency is below the cut-off frequency, the pressure wave will decay along the duct. The different decay rates depend on different cut off ratio. The mesh dependency of the computational simulations has been examined. Wind turbine blade-tower interaction is also simulated by using MB3D code. Adaptively pitching blade is introduced in order to minimize this interaction. The results show that with pitching blade by half degree or so, the unsteady forces on the blade can be at least halved, which can correspondingly reduce the bending moment (hence increase the fatigue life span), and improve the average power output. Keywords: CFD, fan tone noise, cut-off, cut-on, cut-off frequency, pitch control, blade-tower interaction
Replication Data for: Surface-Tension Induced High Packing Density Carbon Nanoribbons Film with Ultrahigh Volumetric Capacitance
No full textRaw data for all plots in the paper: Xiao Jun Shi, Huanwen Wang*, Taoqiu Zhang, Tong Xue, Haiyong He and Hong Jin Fan*, Surface-Tension Induced High Packing Density Carbon Nanoribbons Film with Ultrahigh Volumetric Capacitance, Energy Environ. Sci., 2025,18, 10413-1042
Fan Wenzheng gong po yang yi shi lu
No full text卷一至二. 奏議 -- 卷三. 狀 -- 子 -- 卷四. 表 -- 卷五. 賦 -- 卷六至七. 詩 -- 詩餘 -- 卷八. 序 -- 記 -- 易義 -- 說 -- 論 -- 贊 -- 頌 -- 述 -- 卷九. 書 -- 啟 -- 卷十. 尺牘 -- 家書 -- 卷十一. 祭文 -- 碑銘 -- 墓誌銘 -- 卷十二. 墓誌銘 -- 墓表 -- 書碑陰 -- 附錄: 范文正公年譜序.Juan yi zhi er. Zou yi -- juan san. Zhuang -- Zi -- juan si. Biao -- juan wu. Fu -- juan liu zhi qi. Shi -- Shi yu -- juan ba. Xu -- Ji -- Yi yi -- Shuo -- Lun -- Zan -- Song -- Shu -- juan jiu. Shu -- Qi -- juan shi. Chi du -- Jia shu -- juan shi yi. Ji wen -- Bei ming -- Mu zhi ming -- juan shi er. Mu zhi ming -- Mu biao -- Shu bei yin -- fu lu: Fan Wenzheng gong nian pu xu.毛一鷺彙編.綫裝, 1函.框21.5x15公分, 9行20字, 小字雙行同. 白口, 四周單邊, 無魚尾. 版心上鐫題名, 中鐫卷次, 下鐫葉次及字數.毛序後鐫"天啟二年[1622]冬華亭縣學門人唐造國謹百拜書"見《香港中文大學圖書館古藉善本書錄》(2001, p. 223)前附: 范文正公鄱陽遺事錄 / 毛一鷺彙編.鈐有"北海狂士合清齋主人之印", "京兆禎夫", "禹山人", "隨齋", "大觀樓藏書", "蕭艾室藏"印.Xian zhuang, 1 han.Kuang 21.5 x 15 gong fen, 9 hang 20 zi, xiao zi shuang hang tong. Bai kou, si zhou dan bian, wu yu wei. Ban xin shang juan ti ming, zhong juan juan ci, xia juan ye ci ji zi shu.Mao xu hou juan "Tian qi er nian [1622] dong Huating Xian xue men ren Tang Zaoguo jin bai bai shu"Jian "Xianggang Zhong wen da xue tu shu guan gu ji shan ben shu lu" (2001, p. 223)Mao Yilu hui bian.Qian fu: Fan Wenzheng gong po yang yi shi lu / Mao Yilu hui bian.Qian you "Beihaikuangshi He qing zhai zhu ren zhi yin", "Jing zhao zhen fu", "Yu shan ren", "Sui zhai", "Da guan lou cang shu", "Xiao Ai shi cang" yin
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