Bibliografias temáticas / Xu shi wen xue

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Literatura científica selecionada sobre o tema "Xu shi wen xue"

Autor: Grafiati

Publicado: 28 de julho de 2024

Última modificação: 30 de julho de 2024

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Artigos de revistas sobre o assunto "Xu shi wen xue"

N., W. H., Ch'eng Ch'ien-fan (Cheng Qian fan) e Wu Hsin-lei (Wu Xin lei). "Liang sung wen-hsueh shih (Liang song wen xue shi)". Chinese Literature: Essays, Articles, Reviews (CLEAR) 17 (dezembro de 1995): 197. http://dx.doi.org/10.2307/495587.

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N., W. H., e Wang Shih-ching (Wang Shijing). "T'ang-tai wen-hsueh shih-lueh (Tang dai wen xue shi gao)". Chinese Literature: Essays, Articles, Reviews (CLEAR) 17 (dezembro de 1995): 196. http://dx.doi.org/10.2307/495586.

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N., W. H., e Li Ts'ung-chun (Li Congjun). "T'ang-tai wen-hsueh yen-pien shih (Tang dai wen xue yan bian shi)". Chinese Literature: Essays, Articles, Reviews (CLEAR) 17 (dezembro de 1995): 196. http://dx.doi.org/10.2307/495585.

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Ayre, Brian G., Fathy E. El-Gebaly e Roisin C. McGarry. "Virus-induced flowering—a tool for cereals". Journal of Experimental Botany 71, n.º 10 (30 de maio de 2020): 2839–41. http://dx.doi.org/10.1093/jxb/eraa153.

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This article comments on: Yuan C, Li H, Qin C, Zhang X, Chen Q, Zhang P, Xu X, He M, Zhang X, Tör M, Xue Dawei, Wang H, Jackson S, He Y, Liu Y, Shi N, Hong Y. 2020. Foxtail mosaic virus-induced flowering assays in monocot crops. Journal of Experimental Botany 71, 3012–3023.

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Houxuan, Hu. "16. An Interpretation of the Oracle-Bone Inscription Phrase: “The Sun and Moon Eclipsed”". Early China 9, S1 (1986): 35–38. http://dx.doi.org/10.1017/s0362502800003035.

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ABSTRACTThis paper assembles three oracle-bone inscriptions divined at the same time from the Wu Yi-Wen Ding period. Two are identical, being a paired divination inquiring into whether the event ri yue you shi was or was not auspicious. The third asks whether, in light of this ri yue you shi, it would be auspicious to sacrifice to Shang Jia.Since 1925, when Wang Xiang , first proposed th at the character yue should be read as xi, his position has been accepted by Liu Chaoyang De Xiaoqian , Chen Mengijia , Zhang Peiyü , Xu Zhentao , the Zhongguo Tianwenxue jianshi bianxiezu , and the Zhongguo Tianwenxueshi zhengli yenjiu xiaozu Yue was first interpreted as yue in 1933 by Shang Chengzuo . Those subscribing to this reading include Dong Zuobin , Chen Zungui , Yü Xingwu Liu Chaoyang, Chen Mengiia, Joseph Needham, Zhao Quemin and Chen Banghuai .Among these scholars Liu Chaoyang holds that “there is no distinction between xi and yue,” while Chen Mengjia believes that the phrase “ri yue you shi” can also be read “ri xi you shi,” hence they accept both interpretations.

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DEVRIESE, HENDRIK, e MARTIN HUSEMANN. "Afrosystolederus garmsi (Orthoptera, Tetrigidae), a new genus and species from Mount Gibi (Liberia) with remarks on Systolederus, Pseudosystolederus and Teredorus". Zootaxa 5258, n.º 3 (29 de março de 2023): 331–41. http://dx.doi.org/10.11646/zootaxa.5258.3.6.

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A new genus, Afrosystolederus, and a new species, Afrosystolederus garmsi, are described from Mount Gibi in Liberia. This African genus is most similar to Pseudosystolederus Günther, 1939 from Africa and Madagascar and to some members of Systolederus Bolivar, 1887 from Asia. The taxonomic difficulties of genera and species with a narrow fastigium are discussed. Teredorus aztecus nov.comb. is transferred from the genus Paratettix Bolivar, 1887. It is proposed to transfer all Indo-Malayan species from Teredorus Hancock, 1907 to Systolederus Bolivar, 1887, resulting in 26 new combinations and six replacement names: Systolederus albimarginus (Zheng & Zhou, 1996) nov. comb., Systolederus bashanensis (Zheng, 1993) nov. comb., Systolederus bhattacharyi (Shishodia, 1991) nov. comb., Systolederus bidentatus (Zheng, Huo & Zhang, 2000) nov. comb., Systolederus bipulvillus (Zheng, 2006) nov. comb., Systolederus brachynotoides Zheng, Ou & Lin, 2012 nov. comb., Systolederus brachynotus (Zheng & Xu, 2010) nov. comb., Systolederus camurimarginus (Zheng, 1998) nov. comb., Systolederus carmichaeli (Hancock, 1915) nov. comb., Systolederus chiangraensis (Za, Wen, Kang & Hyde, 2016) nov.comb., Systolederus combfemorus (Za, Wen, Kang & Hyde, 2016) nov. comb., Systolederus ebenotus (Zheng & Li, 2001) nov. comb., Systolederus eurylobatus (Zheng, Shi & Mao, 2010) nov. comb., Systolederus flatimarginus (Zheng & Liang, 2000) nov. comb., Systolederus flavistrial (Zheng, 2006) nov. comb., Systolederus frontalis (Hancock, 1915) nov.comb., Systolederus guizhouensis (Zheng, 1993) nov. comb., Systolederus hainanensis (Zheng, 1993) nov. comb., Systolederus longipulvillus (Zheng, 1988) nov. comb., Systolederus nigropennis (Deng, Zheng & Lu, 2013) nov. comb., Systolederus parvipulvillus (Deng, Lei & Zheng, 2014) nov. comb., Systolederus prominemarginis (Zheng & Jiang, 1993) nov. comb., Systolederus taibeiensis (Zheng & Xu, 2010) nov. comb., Systolederus xishuiensis (Zheng, Li & Shi, 2003) nov. comb. , Systolederus wuyishanensis (Zheng, 1993) nov. comb., Systolederus lii Devriese nov. nom., Systolederus lini Devriese nov.nom., Systolederus oui Devriese nov. nom., Systolederus rongduensis Devriese nov. nom., Systolederus yuanlingensis Devriese nov. nom., Systolederus zhengi Devriese nov. nom.

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Meng, Yan. "On the Narrative Strategy and Moral Value of The Main Theme Movie "Me and My Motherland"". International Journal of Education and Humanities 13, n.º 3 (24 de abril de 2024): 216–20. http://dx.doi.org/10.54097/ww670c80.

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"My Motherland and I" is a film by Chen Kaige as the chief director, Huang Jiaxin as the chief producer, Zhang Yibai, Guan Hu, Xue Xiaolu, Xu Zheng, Ning Hao, Wen Muye co-directed, Huang Bo, Zhang Yi, Wu Jing, Du Jiang, Ge You, Liu Haoran, Chen Feiyu, Song Jia and other people co-starring in a drama film. The film depicts the experiences of seven ordinary people who are closely connected with major national events, and through the perspectives of small characters, shows the deep connection between ordinary people and the country in the 70 years since the founding of New China. Since the film itself was made to celebrate the 70th anniversary of the founding of New China, it is of great research value. This paper aims to study two questions: one is to study the professional narrative strategies used in the film; The second is to sum up the educational significance and moral value of the film. Therefore, this thesis starts from the narrative strategy and moral value of the film, analyzes the content of the film "My Country and I", and explores the far-reaching value expressed by the whole film.

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Wang, Feng-Jiao, Peng Wang, Lian-Yu Chen, Ya-Wen Geng, Hao Chen, Zhi-Qiang Meng, Lu-Ming Liu e Zhen Chen. "TAM Infiltration Differences in “Tumor-First” and “ZHENG-First” Models and the Underlying Inflammatory Molecular Mechanism in Pancreatic Cancer". Integrative Cancer Therapies 17, n.º 3 (22 de abril de 2018): 707–16. http://dx.doi.org/10.1177/1534735418771193.

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Background: Syndrome ( ZHENG in Chinese) in traditional Chinese medicine (TCM) refers to the intrinsic characteristics of a pathological process at a certain stage; these characteristics are influenced by internal and external environments and reveal the nature of a disease. Proper syndrome differentiation is the basic principle that guides clinical treatment. Objective: To have a good understanding of tumor progression and the different mechanisms related to ZHENG that have occurred before and after tumor development and to explore the valid evaluation criteria of different pancreatic cancer syndromes to improve the guiding role of TCM syndrome differentiation in pancreatic cancer treatment. Methods: In this study, we established mouse subcutaneous pancreatic cancer models, namely, Con (control), Pi-Xu (Spleen-Deficiency), Shi-Re (Dampness-Heat), and Xue-Yu (Blood-Stasis). Then, for the first time, we compared the different effects of “ ZHENG-first” (referring to a different disease status that occurred before tumor occurrence) and “Tumor-first” (referring to the change in the tumor microenvironment and the resulting changes in the state of the body) conditions on tumor progression and evaluated the associated molecular mechanisms. Results: We found that tumor growth in the “ ZHENG-first” and “Tumor-first” conditions was different. In the “Tumor-first” model, the tumor growth in the Pi-Xu group was faster than that in the other groups. However, in the “ ZHENG-first” model, the tumor growth trend was most obvious in the Shi-Re group. There was a difference in tumor-associated macrophage infiltration between the 2 models. The expression levels of the inflammatory cytokines IL-6, IL-10, and P-STAT3 were also differentially altered. Conclusion: The emergence of ZHENG conditions before or after tumor occurrence had different impacts on pancreatic cancer development, and these impacts may be related to differences in tumor-associated macrophage infiltration and the involved inflammatory cytokines IL-6, IL-10, and P-STAT3. The study results uncovered the molecular basis of syndrome differentiation in pancreatic cancer progression, which might provide more specific guidance for TCM treatment of pancreatic cancer.

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Caizan Juanarena, Leire, Javier Zamudio-Garcia, Lucía dos Santos Gómez, Adrián López Vergara, Jose M. Porras-Vázquez, Enrique R. Losilla e David Marrero López. "(Digital Presentation) Ni-Doped PrBaFe₂O₅₊ _δ As Symmetrical Electrode for Solid Oxide Cells". ECS Meeting Abstracts MA2023-01, n.º 54 (28 de agosto de 2023): 387. http://dx.doi.org/10.1149/ma2023-0154387mtgabs.

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The development of new redox stable electrode materials for Solid Oxide Cells (SOFs) have attracted great attention in recent years, since finding suitable compositions to operate efficiently in both fuel cell and electrolyzer modes is crucial for their wide commercialization [1]. For this reason, research on new doping strategies [2] and advanced deposition techniques [3] for symmetrical electrode materials have significantly increased with the aim of simplifying cell fabrication and extending cell durability. In this sense, double perovskites are gaining great interest due to their excellent electrical properties and high redox and long-term stability in different atmospheres [4]. In this study, the double-perovskite (PrBa)0.95Fe2O5+δ (PBF) is proposed as symmetrical electrode for SOCs [5]. Two different strategies are implemented: on the one hand, Ni-doping in order to improve the electrical properties under reducing atmosphere and, on the other hand, the preparation of nanostructured electrodes in one-step by spray-pyrolysis deposition. A thorough characterization of the material is performed regarding its crystal structure, microstructure and electrochemical properties in both oxidizing and reducing atmospheres. With that purpose, PBF and (PrBa)0.95Fe2-xNixO5+ δ (PBFNx) powders are prepared by the freeze-drying precursor method. XRD patterns show the formation of a single perovskite-type phase in both air and H2 atmospheres, without the presence of any secondary phases. As for conductivity tests, they reveal increased values for the Ni-doped material over the pristine PBF material in air and 5% H2 at 600 ºC. These materials were thereafter screen-printed onto La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) electrolyte and calcined at 1100 ºC for 1h to ensure adequate adhesion to the electrolyte. Alternatively, spray-pyrolysis deposition method is employed to infiltrate PBFNx, with a 0.02 M precursor solution of the corresponding nitrate salts, into a porous Ce0.9Gd0.1O1.95 (CGO) layer previously fixed onto LSGM electrolyte (PBFNx-CGO). SEM images reveal that the screen-printed PBFNx has a thickness of 30 µm and a particle size of around 1 µm, while the same composition deposited by spray-pyrolysis shows a nanometric particle size and it is well-infiltrated in the 10 µm-thick CGO layer (Figure 1a). These electrode microstructures are maintained after ongoing a reduction process, where exsolved Ni particles are observed on the surface. The impedance spectra show lower polarization resistance (Rp) values for PBFNx with respect to PBF, i.e. 0.47 and 0.62 Ω cm2 at 650 ºC in air, respectively. But most significantly, further Rp reduction is observed for PBFNx-CGO prepared by spray-pyrolysis, values as low as 0.17 Ω cm2 at 650 ºC in air (Figure 1b). In reducing atmosphere, the PBFNx-CGO electrode also has lower Rp values (0.23 Ω cm2 at 650 ºC) when compared to the pristine PBF (0.52 Ω cm2 at 650 ºC). All in all, the nanostructured Ni-doped PBF electrodes exhibit high redox stability and low polarization resistance values under both oxidizing and reducing atmospheres, demonstrating their potential application as symmetrical electrodes for SOCs. These findings show that the optimization of the electrode composition but mostly its microstructure is key when developing new electrode materials for solid oxide cells. This research is supported by Ministerio de Ciencia, Innovación y Universidades through the RTI2018-093735-B-I00 and UMA18-FEDERJA-033 projects (Spain), and the University of Malaga through the B1-2021_03 project. [1] J. Zamudio-García, L. Caizán-Juanarena, J.M. Porras-Vázquez, E.R. Losilla, D. Marrero-López, A review on recent advances and trends in symmetrical electrodes for solid oxide cells, J. Power Sources. 520 (2022). https://doi.org/10.1016/j.jpowsour.2021.230852. [2] T. Su, Y. Li, Y. Yang, Z. Xu, N. Shi, Y. Wan, Y. Xie, D. Huan, S. Xue, C. Xia, Effect of tungsten doping on strontium ferrite electrode for symmetrical solid oxide electrochemical cell, Int. J. Hydrogen Energy. 45 (2020) 23401–23410. [3] Y. Kwon, S. Kang, J. Bae, Development of a PrBaMn2O5+δ-La0.8Sr0.2Ga0.85Mg0.15O3-δ composite electrode by scaffold infiltration for reversible solid oxide fuel cell applications, Int. J. Hydrogen Energy. 45 (2019) 1748–1758. [4] B. Zhang, Y. Wan, Z. Hua, K. Tang, C. Xia, Tungsten-Doped PrBaFe2O5+δ Double Perovskite as a High-Performance Electrode Material for Symmetrical Solid Oxide Fuel Cells, ACS Appl. Energy Mater. 4 (2021) 8401–8409. [5] D. Kim, S.J. Son, M. Kim, H.J. Park, J.H. Joo, PrBaFe2O5+δ promising electrode for redox-stable symmetrical proton-conducting solid oxide fuel cells, J. Eur. Ceram. Soc. 41 (2021) 5939–5946. Figure 1. a) PBFNx-CGO electrode deposited by spray-pyrolysis onto LSGM electrolyte: (i) Low magnification image of the electrode and electrolyte; (ii) Zoomed image of the pure PBFN top layer and the PBFNx layer infiltrated in CGO; and (iii) Zoomed image of PBFNx particles infiltrated on CGO scaffold. b) Polarization resistance (Rp) in air of PBF, PBFNx and PBFNx-CGO electrodes as a function of temperature (450-800 ºC). Figure 1

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Fang, Li-Zhi. "Jiang Xiaoyuan ;, Wu Yan . Zijin shan tian wen tai shi gao: Zhongguo tian wen xue xian dai hua ge an. [History of Purplemountain Observatory.] (Zhongguo jin xian dai ke xue ji shu shi yan jiu cong shu.). 219 pp., tables, bibl., index. Jinan: Shandong jiao yu chu ban she [Shandong Education Press], 2004. 29 (paper)." Isis 99, n.º 3 (setembro de 2008): 645–46. http://dx.doi.org/10.1086/593267.

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Teses / dissertações sobre o assunto "Xu shi wen xue"

Zhu, Xinhua. "A study on the development of superstructure of narrative text written by primary school pupils in four cities of China = Zhong guo si ge cheng shi xiao xue sheng ji xu wen pian zhang de shang ceng jie gou de fa zhan yan jiu /". Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23295922.

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Zhang, Hui. "Zhongguo wen xue pi ping shi shang zhi "shi shi" gai nian /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?HUMA%202005%20ZHANG.

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Li, Xiangnian. "Han Wei Liu Chao zhuan ji wen xue shi gao". Shanghai : Fu dan da xue chu ban she, 1995.

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Li, Vivian Kit Yan. ""Hong" de han yi : "Hong za zhi" yu er shi shi ji chu Shanghai liu xing wen xue /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?HUMA%202007%20LI.

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Chan, Ngon Fung. "Yi gu si chao yu bai hua wen xue shi de jian gou : Hu Shi yu Gu Jiegang /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?HUMA%202004%20CHANN.

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Mao, Jian. "San si shi nian dai Shanghai wen xue yu dian ying zhong de dou shi xin gan jue". online access from Digital dissertation consortium, 2002. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3067170.

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Wu, Tsz Wing. "Li Yu gai bian ju yan jiu : jian lun wen ren chuan qi yu shi min wen xue zhi rong he /". View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?HUMA%202006%20WU.

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Liu, Lixia. "Zhongguo Jidu jiao wen xue de li shi cun zai Historical existence of Chinese Christian literature /". Beijing Shi : She hui ke xue wen xian chu ban she, 2006. http://catalog.hathitrust.org/api/volumes/oclc/76793558.html.

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Wu, Hanxiao, e 吳晗瀟. "Chinese teachers' authority in cross culture classrooms = Zhong wen jiao shi zai kua wen hua jiao xue zhong dui jiao shi quan wei de li jie he tai du de yan jiu". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/209678.

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本文主要探討了中文二語教師在跨文化教學中對教師權威的理解和態度。東西方文化的差異在教師權威方面的表現，是彼此對師生間權力距離的認同並不一樣，東方文化中，權力距離較大，教師更為權威；而西方文化則權力距離較小，學生擁有更多的自由。本研究採訪了香港某國際學校的9名中外二語教師，得出結論：中文二語教師還是重視尊師重道的傳統，但對於教師權威已有了與時俱進的理解，面對外國學生,師生互相協商、尊重，從而達到課堂的學習目標才是教師權威的真正意義。受訪者採取1）樹立嚴師形象、運用獎懲機制；2）從學生角度考慮，尊重、幫助學生；3）自我提升，贏得學生尊重的方式，來應對學生挑戰教師權威的行為。影響受訪者形成如上教師權威的理解和態度，并選擇用以上的方式應對學生挑戰教師權威行為的策略，因素为：成長環境和教學經驗；獎懲制度和職位的肯定；個人性格、師生關係；以及網絡時代的挑戰；教師需要通過不斷進修、學習來提升自我。本文通過分析跨文化教學中，中文教師的教師權威的理解和態度，應對策略和影響因素，引出思考和啓發：1）教師權威需要被重視和理論化；2）教師權威應在跨文化教學中因應學生的需要而轉變；3）區別對待中外學生的原因在于用不同的方法，達到公平、一視同仁的結果，希望學生的需要得到重視和照顧；4）學校教育與社會的關係意味著教師權威被理論化的重要性；5）當代教育學者應著手將教師權威理論化，從而也能使中文二語教師在跨文化教學中有據可循，重建教師權威。
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Tong, Wun-sing. "The application of systemic functional grammar in Chinese practical compositions : the teaching of news reporting = Xi tong gong neng yu yan xue zai shi yong wen jiao xue shang de ying yong yan jiu - yi xin wen gao xie zuo jiao xue wei li /". Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25755559.

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Livros sobre o assunto "Xu shi wen xue"

jie, Ren, e Gu zhi ao. Xu huan yong shi: Wu ming dou shi. Hang zhou: Zhe jiang jiao yu chu ban she, 2013.

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1935-, Liu Shouhua, e Huang Yonglin, eds. Min jian xu shi wen xue yan jiu. Wuhan Shi: Hua zhong shi fan da xue chu ban she, 2005.

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1815-1868, Burns William Chalmers, Blodget H. (Henry) 1825-1903, Hudson Thomas Hall 1800-1876, John Griffith 1831-1912, Shen Zixing 1825-, Milne William 1785-1822, Legge James 1815-1897 et al., eds. Wan Qing Jidu jiao xu shi wen xue xuan cui. Xinbei Shi: Gan lan chu ban you xian gong si, 2012.

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cha, Meng de ge. Xu ai de jiao yu: Yi da li xiao xue sheng en li ke ji xu cheng zhang de gu shi. Beijing: Gai ge chu ban she, 1999.

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Long ma gong zuo shi. AutoCAD 2007 zhong wen ban wan quan zi xue shou ce. Beijing: Ren min you dian chu ban she, 2007.

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Fang, Muru. Ji xu zhai xue gu wen: Shi er juan. Shanghai: Shanghai gu ji chu ban she, 2009.

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Wang, Chunrong, e Guolun Xu. Er shi shi ji Zhongguo liang an wen xue shi: Xu bian. Shenyang: Liaoning da xue chu ban she, 1993.

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Guolun, Xu, e Wang Chunrong, eds. Er shi shi ji Zhongguo liang an wen xue shi: Xu bian. Shenyang: Liaoning da xue chu ban she, 1993.

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Chen, Xuanbo. Shi yu guang: 20 shi ji Zhongguo wen xue shi ge qju zhong de Xu Xu. Nanchang Shi: Bai hua zhou wen yi chu ban she, 2004.

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Xu, Gang. Xu gou de yi shi: Tong shi dai wen xue pian lun. Beijing Shi: Beijing da xue chu ban she, 2017.

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Capítulos de livros sobre o assunto "Xu shi wen xue"

Chen, Yuan-tsung. "From Black Market to Fake Bumper Harvest". In The Secret Listener, 170–82. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197573341.003.0014.

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Yuan-tsung blended further into village life, getting to know more villagers and their survival kit. One of them, a woman cadre named Winter Plum, initiated her into the black market, where she could get better food from a drunken butcher. Old Xu, the ever so complaisant village head, surprised her with his bitter resentment against his higher-ups and his bitterness over the loss of his family’s cohesion caused by collectivization. Wimpy Gu, the reticent and meek assistant to Old Xu, relieved himself occasionally with violent, emotional outbursts. Old Hong, renowned locally as the gloriously demobilized soldier, or Glorious Demob, amazed her with his web of deceit and lies for the sake of manufacturing a fake bumper harvest.

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Xu, Jianliang. "Mobile Caching for Location-Based Services". In Mobile Computing, 3031–39. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-054-7.ch228.

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Location-based services (LBS) are services that answer queries based on the locations with which the queries are associate; normally the locations where the queries are issued. With a variety of promising applications, such as local information access (e.g., traffic reports, news, and navigation maps) and nearest neighbor queries (e.g., finding the nearest restaurants) (Barbara, 1999; Ren & Dunham, 2000; D. L. Lee, Lee, Xu, & Zheng, 2002; W. C. Lee, Xu, & Zheng, 2004), LBS is emerging as an integral part of daily life. The greatest potential of LBS is met in a mobile computing environment, where users enjoy unrestricted mobility and ubiquitous information access. For example, a traveler could issue a query like “Find the nearest hotel with a room rate below $100” from a wireless portable device in the middle of a journey. To answer such a query, however, three major challenges have to be overcome: • Constrained Mobile Environments: Users in a mobile environment suffer from various constraints, such as scarce bandwidth, lowquality communication, frequent network disconnections, and limited local resources. These constraints pose a great challenge for the provision of LBS to mobile users. • Spatial Data: In LBS, the answers to a query associated with different locations may be different. That is, query results are dependent on spatial properties of queries. For a query bound with a certain query location, the query result should be relevant to the query as well as valid for the bound location. This requirement adds additional complexity to traditional data management techniques such as data placement, indexing, and query processing (D. L. Lee, 2002). • User Movement: The fact that a mobile user may change its location makes some tasks in LBS, such as query scheduling and cache management, particularly tough. For example, suppose that a mobile user issues a query “Find the nearest restaurant” at location A. If the query is not scheduled timely enough on the server, the user has moved to location B when he or she gets the answer R. However, R is no longer the nearest restaurant at location B. Caching has been a commonly used technique for improving data access performance in a mobile computing environment (Acharya, Alonso, Franklin, & Zdonik, 1995). There are several advantages for caching data on mobile clients: • It improves data access latency since a portion of queries, if not all, can be satisfied locally. • It helps save energy since wireless communication is required only for cache-miss queries. • It reduces contention on the narrow-bandwidth wireless channel and off-loads workload from the server; as such, the system throughput is improved. • It improves data availability in circumstances where clients are disconnected or weakly connected because cached data can be used to answer queries. However, as discussed above, the constrains of mobile computing environments, the spatial property of location-dependent data, and the mobility of mobile users have opened up many new research problems in client caching for LBS. This chapter discusses the research issues arising from caching of location-dependent data in a mobile environment and briefly describes several state-of-the-art solutions.

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Leong, Hong Va. "Database Support for M-Commerce and L-Commerce". In Electronic Services, 767–76. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-61520-967-5.ch047.

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M-commerce (mobile commerce) applications have evolved out of e-commerce (electronic commerce) applications, riding on recent advancement in wireless communication technologies. Exploiting the most unique aspect inherent in m-commerce, namely, the mobility of customers, l-commerce (location-dependent m-commerce) applications have played an increasingly important role in the class of m-commerce applications. All e-commerce, m-commerce, and l-commerce applications rely on the provision of information retrieval and processing capability. L-commerce applications further dictate the maintenance of customer and service location information. Various database systems are deployed as the information source and repository for these applications, backed by efficient indexing mechanisms, both on regular data and location-specific data. Bean (2003) gave a good report on supporting Web-based e-commerce with XML, which could be easily extended to m-commerce. An m-commerce framework, based on JINI/XML and a workflow engine, was defined by Shih and Shim (2002). Customers can receive m-commerce services through the use of mobile devices such as pocket PCs, PDAs, or even smart phones. These mobile devices together with their users are often modeled as mobile clients. There are three types of entities central to m-commerce and l-commerce applications: mobile device, wireless communication, and database. In this article, we focus our discussion on mobile-client enabled database servers, often referred to as mobile databases. Mobile databases maintain information for the underlying m-commerce and l-commerce applications in which mobile devices serve as the hardware platform interfacing with customers, connected through wireless communication. Location is a special kind of composite data ranging from a single point, a line, a poly-line, to a shape defining an area or a building. In general, locations are modeled as spatial objects. The location of a static point of interest, such as a shop, is maintained in a database supporting spatial features and operations, often a spatial database (Güting, 1994). The location of a moving object, like a mobile customer, needs to be maintained in a moving object database (Wolfson, Sistla, Xu, Zhou, & Chamberlain, 1999), a database that supports efficient retrieval and update of object locations. To enable l-commerce, both spatial databases and moving object databases need to support location-specific query processing from mobile clients and location updates they generated. The two major types of data access requirements for a mobile database are data dissemination and dedicated data access. Data dissemination is preferred, since it can serve a large client population in utilizing the high bandwidth downlink channel to broadcast information of common interest, such as stock quotations, traffic conditions, or special events. On the other hand, dedicated data access is conveyed through uplink channels with limited bandwidth. To disseminate database items effectively, the selected set of hot database items can be scheduled as a broadcast disk (Acharya, Alonso, Franklin, & Zdonik, 1995). Proper indexes can be built to facilitate access to broadcast database items (Imielinski & Badrinath, 1994). Redundancy can be included in data (Leong & Si, 1995) and index (Tan & Ooi, 1998) to combat the unreliability of wireless communication.

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Trabalhos de conferências sobre o assunto "Xu shi wen xue"

Wu, Huanyu, Qi Zhao, Jiayi Shen e Hanze Li. "Numerical Simulation of the Underground Storage Cavern Using FDEM". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0282.

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ABSTRACT Underground storage cavern has been increasingly exploited as it has many advantages such as reducing investment, economizing land use and improving safety compared with storage above the ground surface. We employ the hydromechanical coupled FDEM to simulate the excavation and operation phases of the underground storage cavern with a water curtain system (WCS), taking into consideration the natural discrete fracture network (DFN). The simulation results captured the propagation and slipping of the pre-existing DFN during the excavation and operation process. We quantitatively evaluate the containment performance based on the water inflow and pore pressure distribution. This study provides new insights into evaluating the stability of cavern-surrounding rock masses and containment performance of underground storage caverns. INTRODUCTION Underground storage caverns have better performance on safety, security, economy, and greater environmental acceptance compared with traditional storage infrastructures such as storage tanks and pipelines. Several large underground storage caverns have been constructed, for example, Jurong rock caverns in Singapore (Zhou & Zhao, 2016) and Huangdao underground oil storage caverns in China (Wang et al., 2015). Underground storage caverns are constructed in fractured rock masses, confining the storage medium (such as oil and gas) by maintaining groundwater pressure around caverns which is also called hydraulic confinement (Aberg, 1978; Froise, 1987; Lindblom, 1997). The basic principle of underground containment the cavern is that no gas could leak as long as the water pressure increases along all possible gas leakage paths away from the cavern (Goodall et al., 1988). To enhance the sealing performance, water curtain systems (WCS) are constructed to manually control the pore pressure distribution by regulating the water curtain pressure. (Shi et al., 2018). Previous studies has evaluated the stability of excavated rock masses (Mohanty & Vandergrift, 2012; Ma et al., 2016; Zhuang et al., 2017) and containment performance (Xu et al., 2018; Liu et al., 2021) by using in-situ monitoring methods and numerical simulation. However, the fracture propagation and slip induced by the excavation and operation of the storage cavern, as well as the resultant fluid pressure variation, have not been illustrated.

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