56 research outputs found
History Made for Tomorrow: Hakka Tulou
No full textThe documentary film, History Made for Tomorrow: Hakka Tulou was an October 2010 release by History Channel International. This film is an in-depth study on the green building techniques and sustainable lifestyle of the Hakka people of Southern China with a focus on the ancient Tulou rammed earth structures. The television program follows West Virginia University research professor, Ruifeng Liang, as he initiates scientific studies to back claims that the rammed earth Tulou structures are “the greenest buildings in the world”, and Canadian architect, Jorg Ostrowski, of Autonomous Sustainable Housing Inc., who has been researching the ecological footprint of Hakka communities since August 2007, to promote them as “eco-villages” of best practices for planet Earth’s sustainability. The author is credited as Director, Writer, and Producer of this film. This paper is based on the script of the production
VAT OF THE LEXICAL TONES IN MANDARIN CHINESE
No full textThe purpose of this research was to investigate the association of vocal attack time (VAT) and tones in speakers of Mandarin Chinese, and to explore how tones initiated at different pitch levels affected VAT. SP and EGG signals were synchronously recorded from 72 young undergraduates or postgraduates (42 females and 30 males) while they were reading aloud a wordlist of 50 disyllabic words at their most comfortable pitch, loudness and rate. VAT measures revealed three findings. (1) Vocal attack time shows no significant difference between the common yangping and the yangping derived from shangsheng. This, from a physiological perspective, supports the argument that the tone sequence 3-3 in Mandarin is indeed converted into 2-3, nothing else. (2) The tones of Mandarin Chinese that start from low pitch levels (35, 21) tend to present significantly different VAT values from those that start from high pitch levels (55, 51), with mean VATs of the former being much longer than those of the latter. This embodies the nonlinear contra-variant relationship between VAT and F0 at vowel onsets. (3) There are deviations or individual differences: a small number of people do not follow this pattern.National Social Sciences Foundation of China; [10ZD125]A&HCISSCIARTICLE2275-2894
Experimental Study on the Impact of NaCl Concentration on the Flocculating Settling of Fine Sediment in Static Water
No full textAbstractNaCl concentration can increase the flocculation of the fine-grained sediments in suspension. However, the impact of NaCl concentration on the process of flocculation and settling is unclear. This paper investigated the effect of NaCl concentration on the settling velocity of fine sediments, which kaolin is the constituent mineral of the sediment sample (D10=0.9μm; D50=2.7μm; D90=10.3μm). The experiments were conducted in a 1.2 meter high settling column. Experimental cases were set for different initial concentration of sediment (0.2, 0.5, 1.0 g·l-1) and different NaCl concentration (0, 0.2, 0.5, 1.0, 2.0 g·l-1). With respect to each case, water samples were collected and measured at 11 different times from 0min to 300min during the process of experiment. Settling velocities were calculated based on the time evolution of suspended sediment concentrations. The experimental results show the time evolution of the relative sediment concentration, which is the ratio of the concentration to the initial concentration, follows a hyperbolic dynamic model under the low initial sediment concentration conditions. The settling velocity increases with the NaCl concentration and sediment concentration. An empirical formula among the settling velocity of sediment, salinity and sediment concentration have been established by means of the multiple linear regression analysis
Handle additions producing essential surfaces
No full textWe construct a small, hyperbolic 3-manifold M with the property that, for any integer g >= 2, there are infinitely many separating slopes r in partial derivative M such that the 3-manifold M(r) obtained by attaching a 2-handle to M along r contains an essential separating closed surface of genus g. The resulting manifolds M( r) are still hyperbolic. This contrasts sharply with known finiteness results on Dehn filling and with the known finiteness result on handle addition for the cases g = 0, 1. Our 3-manifold M is the complement of a hyperbolic, small knot in a handlebody of genus 3.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000251563100011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701MathematicsSCI(E)3ARTICLE1233-25522
Thermodynamic and techno-economic evaluation of a CAES based cogeneration system integrated with high-temperature thermal energy storage and ammonia absorption refrigeration
No full textThe development of compressed air energy storage (CAES) technology can ensure the safe and stable operation of the power system, promote the consumption of renewable energy and reduce carbon emissions. In order to improve the comprehensive performance of the CAES system and meet the diversified demand of energy, a cooling, heating and power cogeneration system based on compressed air energy storage with high temperature thermal energy storage and ammonia absorption refrigeration are developed in this study. The compression heat of the energy storage process and the exhaust waste heat of the energy release process are fully utilized in this system. Thermodynamic analysis, techno-economic evaluation and parametric analysis are conducted. The thermodynamic analysis results show that the proposed system achieve an ENE of 81.51 %, an EXE of 53.51% and an ESD of 7.08 kWh/m3 under the design condition. The economic analysis results indicate that the NPV, IRR and LCOE for a system life of 25 years are 489497 /kWh, with a DPP of 3.91 years. Sensitivity analysis results conclude that the outlet temperature of HTTES, and the maximum and minimum operating pressures are the key parameters affecting the system performance
Fabrication and characterization of silica/polypyrrole nanocomposites using silica sulfuric acid as templates
No full textResearch on the Trends and Features of Enterprise Digital Transformation: Based on the WOS Database
Get PDFIn the context of the digital economy, in order to systematically understand the overall characteristics of the digital transformation of Chinese enterprises, this article conducts a statistical analysis of hotspots and trends in this field, which can provide a useful directional reference for subsequent scholars. Using literature statistical methods, processing literature data based on CiteSpace software, using data mining thinking to analyze scientific metrology knowledge graphs, selecting the enterprise digital transformation research papers published in the Web of Science database from 2008 to 2021 as the research object, Analyze the changes in the volume of articles, research institutions, authors, and keywords. The research shows that after 2018, it is a period of rapid development of enterprise digital transformation; paper publishing institutions are mainly concentrated in institutions and universities that are excellent in engineering and management. Most institutions conduct corresponding research independently, but cooperative research is Future trends; five author research communities constitute the main research strength; the research mainly focuses on digital government, intelligent manufacturing, industrial Internet and supply chain management, and has important theoretical reference value for the development of digital transformation of Chinese enterprises
Optimal Location Query and Optimal Meeting Point Query in Road Networks
No full text本論文著重研究了道路網絡最佳服務位置查詢問題。此問題現有的最優解只考慮一個新的服務位置查詢。當兩個或者多個新的服務位置將被建立， MinMax 和Maxsum 問題會變為NP 困難問題。我們把已有的結果延伸可以解決多個新的服務位置的問題。我們提出了三種不同問題的算法MinMax, MaxSum 和BoundedMax。我們也研究了最優交匯點問題。對於MinMax 問題，我們提出了新的算法，並表明當新的服務位置數量很少時算法很有效。當新的服務位置的數量很多時，我們提出了一種高效的近似率在3 倍以內的算法。對於MaxSum 和BoundedMax問題，我們提出了高效的算法。對於最優交匯點問題，我們提出了具有更小索引的新算法。This thesis focuses on the problem of optimal location querying for location based services in road networks.The existing optimal solutions on this problem consider only the query for one new server. When two or more new servers are to be set up, the problem with minmax and maxsum cost criteria, MinMax and MaxSum, becomes NP-hard. Here we extend the work to handle the problem with multiple new servers. We propose algorithms for three variations of the problem: MinMax, MaxSum and BoundedMax. We also study the optimal meeting point query.We derive a novel algorithm for MinMax, and show that it is efficient when the number of new servers is small. When the number of new servers is large, we propose an efficient 3-approximate algorithm. We propose efficient algorithm for Maxsum and BoundedMax problem. For optimal meeting point query, we derive a new algorithm with smaller index size and comparable rumtime.Liu, Ruifeng.Thesis M.Phil. Chinese University of Hong Kong 2016.Includes bibliographical references (leaves ).Abstracts also in Chinese.Title from PDF title page (viewed on …).Detailed summary in vernacular field only.Detailed summary in vernacular field only.Detailed summary in vernacular field only
A hybrid escalating evolutionary algorithm for multi-objective flow-shop scheduling
No full textA hybrid escalating evolutionary algorithm, which aims at solving multi-objective flow-shop scheduling problems, is proposed in this paper The new algorithm takes an escalating evolutionary structure, which helps it escaping from premature, and an elitism strategy is introduced to improve its convergence, besides, a problem-dependent meta-heuristic variable local search strategy is adopted to enhance its local search ability. To assess the performance and demonstrate the effectiveness of the new algorithm, a series of standard bi-objective test problems and a typical tri-objective case study are employed Empirical results have shown that, our new algorithm has outperformed some well-known algorithms like NSGA-II, ENGA and MOGLS.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000250427900078&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Automation & Control SystemsComputer Science, Artificial IntelligenceComputer Science, Software EngineeringCPCI-S(ISTP)
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