1,219 research outputs found
On different integrable systems sharing the same nondynamical r-matrix
No full textIn a recent paper [Zhijun Qiao and Ruguang Zhou, Phys. Lett. A 235, 35 (1997)], the amazing fact was reported that a discrete and a continuous integrable system share the same r-matrix with the interesting property of being nondynamical. Now, we present three further pairs of different continuous integrable systems sharing the same r-matrix again being nondynamical. The first pair is the finite-dimensional constrained system (FDCS) of the famous AKNS hierarchy and the Dirac hierarchy; the second pair is the FDCS of the well-known geodesic flows on the ellipsoid and the Heisenberg spin chain hierarchy; and the third Flair is the FDCS of one hierarchy studied by Xianguo Geng [Phys. Lett. A 162,:375 (1992)] and another hierarchy proposed by Zhijun Qiao [Phys. Lett. A 192, 316 (1994)]. All those FDCSs possess Lax representations and from the viewpoint of r-matrix can be shown to be completely integrable in Liouville's sense. (C) 1998 American Institute of Physics.Physics, MathematicalSCI(E)5ARTICLE63271-32793
A Chinese Word on IMAGE. Zheng Qiao (1104-1162) and His Thought on Images
No full textGothenburg Studies in Art and Architecture nr 25Acta Universitatis GothoburgensisISSN 0348-4114Editor: Lena JohannessonDoctoral dissertation at Göteborg University, 2008ABSTRACTSi, HanA Chinese word on imageZheng Qiao (1104-1162) and his thought on images.Göteborg, 2008ISBN 978-91-7346-607-3Zheng Qiao (1104-1162) was a Chinese historian who lived during the Song dynasty (960-1279), and the author of the comprehensive history of China Tong zhi (General history), which includes a special treatise on images called Tu pu lüe (Treatise on images and tables). Image-related comments and practices can also be found in several other parts of Tong zhi, as well as in other remaining texts of Zheng Qiao. This study focuses on Zheng Qiao s thought on images. His image-related texts are translated, commented, and analysed; his life and works are outlined; the influence of his thought on images in Chinese history is exemplified; and his concerns on images and the study of images are connected to traditional Chinese thought, as well as to some of our contemporary discussions concerning images. In his texts on images, Zheng Qiao expounded the equal importance of images (tu), by comparing them with writings/words (shu); characterized what an image (tu) is and the function of different types of images; explained why images are indispensable in various solid learning , such as astronomy, geography, architecture, historiography and linguistics; analyzed the reason for the loss of images and the tradition of using images during the dynasties; blamed the traditional bibliographers whose methods suited only preserving books with pure texts but not images and who caused the loss of images; criticized the current scholarly trend that emphasized words but despised images; advocated tu xue (image studies) as a fundamental scholarship of all learning; and contributed to the domain of images not only in theory but also in practice. In this study, a brief account of Zheng Qiao s life and works as a general background is provided. Zheng Qiao s major text on images Tu pu lüe is translated, interpreted and analyzed, and his other comments on images shown elsewhere in Tong zhi are collected and summarized thematically. His influence on later Chinese scholars and their image theories and practices in using images is exemplified, which relates Zheng Qiao to a wider context and historical background. Since this study is written in English and classical Chinese texts are interpreted and translated, conceptual premises need to be established. Hence, problematic English terms such as image and its cognates are discussed by examining some current Western image theories. Chinese terms, such as tu and xiang, are also discussed, with the focus on how they were generally used before and after Zheng Qiao. Zheng Qiao is the first scholar we know about who, at length, expounded the importance of images and propagated the image studies, to its essence very close to our view today. His words on images deserve to be looked at as a milestone in the ongoing process of establishing a genealogy of the history of images and image studies.KEY WORDS: Zheng Qiao, Tu pu lüe, Tong zhi, Tu, Xiang, Chinese image history, Picture theory, Tuxue, Tu pu zhi xue, Image studies, Image science, Bild, Bildvetenskap, Chinese art history, Zheng Xuecheng, Iconology, Domain of images, Phenomenology, Imagery, Appearance, Table, Diagram, Chinese writings and characters, Word and image.www.sihan.infoCopyright © Han SiPrinted in Sweden by Docusys Intellecta, Göteborg January 2008Distribution: Acta Universitatis Gothoburgensis, Box 222, SE-405 30, Götebor
L'Emigrazione cinese e gli immigrati dallo Zhejiang meridionale a Sassari
No full textThis work aims to analyze, firstly, the Chinese migrations from a more complex view with the purpose of finding the causes of these movements; secondly, it focalizes on the common factors that guide the behavior of overseas Chinese in the different countries; thirdly, it studies the peculiarities of southern Zhejiang, as the main source of Chinese immigrants in Sassari. The author tries to identify, from a national perspective to a local perspective, the factors that influence the integration of Chinese immigrants originating from southern Zhejiang in the local society. Finally, the linguistic-cultural mediation is proposed as a practical tool that, at the collective level, will improve the mutual recognition and at the individual level, will facilitate the access of Chinese users to public services to improve their adaptability
An inverse Compton scattering (ICS) model of pulsar emission - II. Frequency behavior of pulse profiles
No full textThe shapes of pulse profiles, especially their variations with respect to observing frequencies, are very important to understand emission mechanisms of pulsars. However, no previous attempt has been made to interpret their complicated phenomenology. In this paper, we present theoretical simulations for the integrated pulse profiles and their frequency evolution within the framework of the inverse Compton scattering (ICS) model proposed by Qiao (1988) and Qiao & Lin (1998). Using the phase positions of the pulse components predicted by the "beam-frequency figure" of the ICS model, we present Gaussian fits to the multi-frequency pulse profiles for some pulsars. It is shown that the model can reproduce various types of the frequency evolution behaviors of pulse profiles observed.Astronomy & AstrophysicsSCI(E)EI19ARTICLE3964-97137
Correction: Ding, X.; Liu, G.; Du, M.; Guo, H.; Qiao, H. and Gerada, C. Development of an Axial Flux MEMS BLDC Micromotor with Increased Efficiency and Power Density. Energies 2015, 8, 6608–6626
No full textWe wish to make the following change to the published paper [1]. The name of the corresponding author should be “Hao Qian” instead of “Hao Qiao”. [...
Single-photon transport through a waveguide coupling to a quadratic optomechanical system
No full textWe study the coherent transport of a single photon, which propagates in a one-dimensional waveguide and is scattered by a quadratic optomechanical system. Our approach, which is based on the Lippmann-Schwinger equation, gives an analytical solution to describe the single-photon transmission and reflection properties. We analyze the transport spectra and find they are not only related to the optomechanical system's energy-level structure, but also dependent on the optomechanical system's inherent parameters. For the existence of atomic degrees of freedom, we get a Rabi-splitting-like or an electromagnetically induced transparency (EIT)-like spectrum, depending on the atom-cavity coupling strength. Here, we focus on the single-photon strong-coupling regime so that single-quantum effects could be seen.SCI(E)ARTICLE19
Radio and gamma-ray emissions from pulsars: possible observational tests
No full textMany models for the pulsar radio and gamma-ray emissions have been developed. The tests for these models using observational data are very important. Tests for the pulsar radio emission models using frequency-altitude relation are presented in this paper. In the radio band, the mean pulse profiles evolve with observing frequencies. There are various styles of pulsar profile - frequency evolutions (which we call as "beam evolution" figure), e.g. some pulsars show that mean pulse profiles are wider and core emission is higher at higher frequencies than that at lower frequencies, but some other pulsars show completely the contrary results. We show that all these "beam evolution" figures can be understood by the Inverse Compton Scattering(ICS) model (see Qiao at al.2001 also). An important observing test is that, for a certain observing frequency different emission components are radiated from the different heights. For the gamma-ray pulsars, the geometrical method (Wang et al. 2006) can be used to diagnose the radiation location for the gamma-ray radiation. As an example, Wang et al. (2006) constrain the gamma-ray radiation location of PSR B1055-52 to be the place near the null charge surface. Here we show that Wang's result matches the proposed radiation locations by the annular gap model as well as the outer gap models.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000252959900021&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Astronomy & AstrophysicsCPCI-S(ISTP)
Wei xing ji he qiao na mi jie gou de he cheng yu biao mian deng li ji yuan te xing yan jiu
No full textRuan, Qifeng = 衛星及核殼納米結構的合成與表面等離激元特性研究 / 阮琦鋒.Thesis Ph.D. Chinese University of Hong Kong 2015.Includes bibliographical references.Abstracts also in Chinese.Title from PDF title page (viewed on 16, December, 2016).Ruan, Qifeng = Wei xing ji he qiao na mi jie gou de he cheng yu biao mian deng li ji yuan te xing yan jiu / Ruan Qifeng
The wave model of Key Laboratory of Marine Science and Numerical Modeling
No full textThe 3th generation wave model of Key Laboratory of Marine Science and Numerical Modeling (MASNUM) was developed by Yuan et al. (1991, 1992) at First institude of oceanography (FIO). the characteristic inlaid method is applied to integrating the wave energy spectrum balance equation. In order to extend the model from regional to global scale, the MASNUM wave model in spherical coordinates was updated by Yang et al. (2005). To speed up the efficency, MASNUM wave model parallelized by Wang et al. (2010).
People are encouraged to contact the corresponded author, Fangli, Qiao ([email protected] ), if you are interested in using this model
Surface-emitting lasers for communications: novel metal-cavity microlasers and high-contrast-grating tunable VCSELs
No full textA comprehensive study of the theory and experiments of surface-emitting semiconductor lasers is presented. The design of novel micro and nanolasers using metal cavities for optical confinement is discussed. Theoretical modeling of quantum-well and quantum-dot emission properties, as well as experimental characterization of their coupling with optical cavities, are presented. Lasing behavior of our designed and fabricated devices is demonstrated at room temperature under continuous-wave and pulsed electrical injection with 3-μm and 1-μm cavity diameters, respectively. This work provides the research path toward dense-integrable power-efficient on-chip light sources. Surface-emitting tunable lasers for high-speed, long-haul communication are investigated. Novel laser designs using micro-electro-mechanical system controlled high-contrast gratings as tunable mirrors are presented. Rigorous, accurate, and efficient electromagnetic models for high-contrast gratings are developed. Our model enables us to design high-contrast gratings as one-dimensional or two-dimensional metastructures integrable on surface-emitting lasers. A wide range of optical functionalities such as broadband reflection, high-Q resonance, filtering, beam-steering, focusing, beam-conversion, and generation of photon orbital angular momentum are achieved. Our optical model is integrated with our laser cavity model and the rate equation model to predict the temperature-dependent voltage tunable light output intensity and spectra. Future design and experimental strategies for heterogeneously integrated tunable surface-emitting lasers are discussed.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01The student, Pengfei Qiao, accepted the attached license on 2015-04-13 at 17:11.The student, Pengfei Qiao, submitted this Dissertation for approval on 2015-04-13 at 17:33.This Dissertation was approved for publication on 2015-04-14 at 13:35.DSpace SAF Submission Ingestion Package generated from Vireo submission #7840 on 2015-07-22 at 14:24:22Made available in DSpace on 2015-07-22T22:45:14Z (GMT). No. of bitstreams: 2
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