72,825 research outputs found

    Free-convection condensation on single horizontal pin-fin tubes

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    PhDNew experimental data are reported for free-convection condensation of ethylene glycol and R-113 on three-dimensional pin-fin tubes. Effects of pin geometry and tube thermal conductivity (for copper, brass and bronze giving a mean range of 400, 120 and 80 W/m K over the range of temperature of interest) were investigated. All tests were performed at near atmospheric pressure with downward flowing vapour at low velocity. Heat-transfer enhancement was found to be approximately twice the corresponding active surface area of the tubes, i.e. the surface area of the parts of the tube and pin surface not covered by condensate retained by surface tension. For ethylene glycol, the best performing pin-fin tube gave a heat-transfer enhancement of 5.8, about 24 % higher than the ‘equivalent’ two-dimensional integral-fin tube (i.e. with the same finroot diameter, longitudinal fin spacing and thickness and fin height). For R-113, the best enhancement was 5.9, about 10 % higher than the equivalent integral-fin tube. For both fluids tested, vapour-side, heat-transfer enhancement was found to increase with decreasing circumferential pin spacing and increasing pin height. Circumferential pin thickness had little effect on heat-transfer enhancement. Effects of tube thermal conductivity were found to be more significant for ethylene glycol than R-113. Retention angle measurements were made under static conditions (without condensation) and were found to be larger than for equivalent integral-fin tubes. An expression for condensate retention angle on pin-fin tubes was proposed and found to agree with the measured retention angles to ±15%. A semi-empirical model for condensation heat transfer on horizontal pin-fin tubes has been developed which accounts for the combined effect of gravity and surface tension. The model predicts the majority of available data to ±20 %

    Yu xu yi yan

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    v.1. 醫林獵要 / 黃保康輯 ; [黃]任恆編校 -- v.2. 吳鞠通方歌 / 黃保康著 ; 黃任恆校注 -- 陳修園方歌 / 黃任恆編 -- v.3. 貽令堂雜俎 : [四編], 雜說, 遺詩 / 黃保康撰 ; [黃]任恆編校 -- 與壻遺言 : 附錄 / 黃保康撰.v.1. Yi lin lie yao / Huang Baokang ji ; [Huang] Renheng bian jiao -- v.2. Wu ju tong fang ge / Huang Baokang zhu ; Huang Renheng jiao zhu -- Chen Xiuyuan fang ge / Huang Renheng bian -- v.3. Yi ling tang za zu : [si bian], za shuo, yi shi / Huang Baokang zhuan ; [Huang] Renheng bian jiao -- Yu xu yi yan : fu lu / Huang Baokang zhuan.[黃保康撰].綫裝.框14.5x11.7公分, 10行20字, 小字雙行同. 黑口, 左右雙邊, 單黑魚尾. 版心中鐫題名, 卷次, 下鐫葉次.書名背頁刻"宣統三年五月刻成"《中國叢書綜錄》p.727著錄 ; 《中國中醫古籍總目》13297著錄.《貽令堂雜俎》分經, 史, 子, 集編.鈐"莊兆祥印"朱, 白文各一方.Xian zhuang.Kuang 14.5 x 11.7 gong fen, 10 hang 20 zi, xiao zi shuang hang tong. Hei kou, zuo you shuang bian, dan hei yu wei. Ban xin zhong juan ti ming, juan ci, xia juan ye ci.Shu ming bei ye ke "Xuantong san nian wu yue ke cheng"Detailed notes in vernacular field only."Yi ling tang za zu" fen jing, shi, zi, ji bian.[Huang Baokang zhuan].Qian "Zhuang Zhaoxiang yin" zhu, bai wen ge yi fang

    FIGURE 4 in Genetic diversity of the regionally endangered Chinese ricefish (Oryzias sinensis) in Taiwan, with comments on its conservation status

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    FIGURE 4. Molecular phylogenetic tree of Chinese ricefish in Taiwan based on combined COI and D-loop sequences constructed with the maximum likelihood method. Bootstrap values less than 50 are not shown.Published as part of Huang, Shih-Pin, Wang, Tzi-Yuan, Lin, Ting-Yu & Huang, Hui-Chu, 2022, Genetic diversity of the regionally endangered Chinese ricefish (Oryzias sinensis) in Taiwan, with comments on its conservation status, pp. 283-307 in Zootaxa 5189 (1) on page 288, DOI: 10.11646/zootaxa.5189.1.26, http://zenodo.org/record/711961

    Pareuzebyella Huang & Wei & Lai & Chen & Yuan 2021, GEN. NOV.

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    DESCRIPTION OF <i>PAREUZEBYELLA</i> GEN. NOV. <p> <i>Pareuzebyella</i> (Par.eu.ze.by.el'la. Gr. prep. <i>para</i> beside; N.L. fem. n. <i>Euzebyella</i> a bacterial genus name; N.L. fem. n. <i>Pareuzebylla</i> beside <i>Euzebyella</i>).</p> <p> Cells are Gram-staining-negative, aerobic, short-rod shaped, non-flagellated, non-motile and non-gliding. Catalase is positive but oxidase is negative. NaCl is required for growth. Flexirubin-type pigment and carotenoid are produced. Respiratory quinone is MK-6. The predominant fatty acids are C 15:0 iso, C 16:0, and C 17:0 iso 3-OH. Genome size is 4.9–5.0 Mb with G+C content of ~41.5 mol%.</p> <p> The type species is <i>Pareuzebyella sediminis</i>.</p>Published as part of <i>Huang, Zhaobin, Wei, Xiaomei, Lai, Qiliang, Chen, Shiyong & Yuan, Jianjun, 2021, PareUZebyella sediminis gen. nov., sp. nov., a novel marine bacterium in the family FlaVObaCTeriaCeae, isolated from a tidal flat sediment, pp. 1-9 in International Journal of Systematic and Evolutionary Microbiology (004606) (004606) 71 (1)</i> on page 8, DOI: 10.1099/ijsem.0.004606, <a href="http://zenodo.org/record/6048729">http://zenodo.org/record/6048729</a&gt

    Motivations and strategies for a real revaluation of the Yuan.

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    Most Western economists and policymakers agree that the Yuan is significantly undervalued and push for its quick nominal revaluation. This paper defends that many domestic and foreign factors could be responsible for the Yuan’s undervaluation, and the People’s bank of China (PBC) cannot optimally invest growing foreign exchange reserves. It provides a theoretical framework to discuss the optimal strategy associating a gradual nominal revaluation of the Yuan with higher inflation, and structural and macroeconomic policies to bring the real exchange rate to its equilibrium level. This strategy allows absorbing external imbalances while laying down the foundation for China’s long-term growth.Real revaluation; Yuan; Renminbi (RMB); foreign exchange reserves; external imbalance; macroeconomic adjustment measures.
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