24,794 research outputs found
VisPoly; A Software of Visiblitlity Graph with Multiple Reflection and its Application of Wireless Communication Design
No full textVisPoly is geometric software designed and implemented by Min Fan to calculate the visibility graph of a simple polygon with k reflections. The current version requires that software package LEDA installed. This report will cover the algorithm to compute a k-reflection visibility graph, the applications on wireless communication design, and the author’s ideas for further research in this field.Technical report DCS-TR-35
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
Androlaelaps parasingularis Gu, Wang & Fan 1996
No full text33. Androlaelaps parasingularis Gu, Wang & Fan, 1996 Host/Habitat. Decaying litter. Distribution. Jiexiu: Mianshan (Bai et al. 2012).Published as part of Ma, Min, Li, Sheng-Cai & Fan, Qing-Hai, 2015, Mites and ticks (Acari) in Shanxi Province, China: an annotated checklist, pp. 1-39 in Zootaxa 4006 (1) on page 9, DOI: 10.11646/zootaxa.4006.1.1, http://zenodo.org/record/28926
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
Application of Fan Therapy in Alleviating Dyspnea
No full textYayuan Tan,1,2,* Gaosheng Zhou,1,2,* Xueli Li,1,2,* Zhaohui Zhang,1,2 Fu Ni,1,2 Min Liu1,2 1The First College of Clinical Medical Science, China Three Gorges University, Yichang, Hubei, 443000, People’s Republic of China; 2Department of Intensive Medicine, Yichang Central People’s Hospital, Yichang, Hubei, 443000, People’s Republic of China*These authors contributed equally to this workCorrespondence: Min Liu, The First College of Clinical Medical Science, China Three Gorges University, Yichang, Hubei, 443000, People’s Republic of China, Email [email protected]: Fan therapy has been shown to alleviate dyspnea effectively. Given its cost-effectiveness, safety, and ease of implementation, this review examines the concept and evolution of fan therapy, its mechanisms of action, implementation methods, applications across various patient populations, and its current advantages and limitations, providing a reference for the management of dyspnea symptoms.Keywords: fan therapy, review, clinical application, dyspne
Hunting efficiency and predation risk shapes the color-associated foraging traits of a predator
No full textFan Fiction and Copyright: Outsider Works and Intellectual Property Protection
No full textAs long as there have been fans, there has been fan fiction. There seems to be a fundamental human need to tell additional stories about the characters after the book, series, play or movie is over. But developments in information technology and copyright law have put these fan stories at risk of collision with the content owners’ intellectual property rights. Fan fiction has long been a nearly invisible form of outsider art, but over the past decade it has grown exponentially in volume and in legal importance. Because of its nature, authorship, and underground status, fan fiction stands at an intersection of key issues regarding property, sexuality, and gender. In Fan Fiction and Copyright, author Aaron Schwabach examines various types of fan-created content and asks whether and to what extent they are protected from liability for copyright infringement. Professor Schwabach discusses examples of original and fan works from a wide range of media, genres, and cultures. From Sherlock Holmes to Harry Potter, fictional characters, their authors, and their fans are sympathetically yet realistically assessed. Fan Fiction and Copyright looks closely at examples of three categories of disputes between authors and their fans: Disputes over the fans’ use of copyrighted characters, disputes over online publication of fiction resembling copyright work, and in the case of J.K. Rowling and a fansite webmaster, a dispute over the compiling of a reference work detailing an author's fictional universe. Offering more thorough coverage of many such controversies than has ever been available elsewhere, and discussing fan works from the United States, Brazil, China, India, Russia, and elsewhere, Fan Fiction and Copyright advances the understanding of fan fiction as transformative use and points the way toward a safe harbor\u9d for fan fiction
Learning of algorithms: a theoretical model with focus on cognitive development
No full textTaking a broad perspective on algorithm in mathematics, the author presents a theoretical model about the learning and teaching of algorithm with focus on students’ cognitive development. The model consists of three cognitive levels: 1. Knowledge and Skills, 2. Understanding and Comprehension, and 3. Evaluation and Construction. The model suggests that teaching and learning of algorithm does not simply mean routine learning, memorization, or lead to a low level of cognition. The paper also discusses different teaching strategies and activities that can be used to support students’ cognitive development at different cognitive levels
Exploring source region of 3-min slow magnetoacoustic waves observed in coronal fan loops rooted in sunspot umbra
No full textSunspots host various oscillations and wave phenomena like umbral flashes,
umbral oscillations, running penumbral waves, and coronal waves. All fan loops
rooted in sunspot umbra constantly show a 3-min period propagating slow
magnetoacoustic waves in the corona. However, their origin in the lower
atmosphere is still unclear. In this work, we studied these oscillations in
detail along a clean fan loop system rooted in active region AR12553 for a
duration of 4-hour on June 16, 2016 observed by Interface Region Imaging
Spectrograph (IRIS) and Solar Dynamics Observatory (SDO). We traced foot-points
of several fan loops by identifying their locations at different atmospheric
heights from the corona to the photosphere. We found presence of 3-min
oscillations at foot-points of all the loops and at all atmospheric heights. We
further traced origin of these waves by utilising their amplitude modulation
characteristics while propagating in the solar atmosphere. We found several
amplitude modulation periods in the range of 9-14 min, 20-24 min, and 30-40 min
of these 3-min waves at all heights. Based on our findings, we interpret that
3-min slow magnetoacoustic waves propagating in coronal fan loops are driven by
3-min oscillations observed at the photospheric foot-points of these fan loops
in the umbral region. We also explored any connection between 3-min and 5-min
oscillations observed at the photospheric foot-points of these loops and found
them to be weakly coupled. Results provide clear evidence of magnetic coupling
of the solar atmosphere through propagation of 3-min waves along fan loops at
different atmospheric heights.Comment: Accepted for publication in MNRA
- …
