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61.
王昆 《河北能源职业技术学院学报》2009,9(4):62-64,70
目的研究双级上流式曝气生物滤池（BAF）工艺脱碳硝化原理,确定该工艺运行参数．方法通过实验对比气水比、水力负荷、容积负荷等参数的变化对处理效果的影响．结果接种挂膜需要12—19d,常速启动、加载启动均需1-2d．过滤周期由水力负荷2．6m3／（m3·h）时的65h缩短到水力负荷5．2m3／（m2·h）时的46h;当水力负荷进一步提高到7．8m3／（m3·h）时,出水明显恶化．结论气水比过小,溶解氧不足将抑制好氧微生物活性,影响污染物的氧化分解;气水比过大,富余气泡将减少过水断面面积,缩短水力停留时间,影响处理效果．一级滤池、二级滤池气水比宜分别采用2：1和1．3：1,当水力负荷〈5．2m3／（m2·h）,出水水质满足杂用水需要．出水底物质量浓度随容积负荷的升高而上升,受水力负荷的影响较小COD容积负荷〈2．0kg／（m3·d）和NH3-N容积负荷〈0．6kg／（m3·d）时,经两级BAF处理出水在运行周期内能满足排放标准。 相似文献
62.
Mark Evans Ella Patchett Rickard Nally Rachel Kearns Matthew Larney 《European Journal of Sport Science》2018,18(3):376-386
Acute ingestion of ketone salts induces nutritional ketosis by elevating β-hydroxybutyrate (βHB), but few studies have examined the metabolic effects of ingestion prior to exercise. Nineteen trained cyclists (12 male, 7 female) undertook graded exercise (8 min each at ～30%, 40%, 50%, 60%, 70%, and 80% VO2peak) on a cycle ergometer on two occasions separated by either 7 or 14 days. Trials included ingestion of boluses of either (i) plain water (3.8?mL?kg?body mass?1) (CON) or (ii) βHB salts (0.38?g?kg?body mass?1) in plain water (3.8?mL?kg body mass?1) (KET), at both 60 min and 15 min prior to exercise. During KET, plasma [βHB] increased to 0.33?±?0.16?mM prior to exercise and 0.44?±?0.15?mM at the end of exercise (both p?.05). Plasma glucose was 0.44?±?0.27?mM lower (p?.01) 30?min after ingestion of KET and remained ～0.2?mM lower throughout exercise compared to CON (p?.001). Respiratory exchange ratio (RER) was higher during KET compared to CON (p?.001) and 0.03–0.04 higher from 30%VO2peak to 60%VO2peak (all p?.05). No differences in plasma lactate, rate of perceived exertion, or gross or delta efficiency were observed between trials. Gastrointestinal symptoms were reported in 13 out of 19 participants during KET. Acute ingestion of βHB salts induces nutritional ketosis and alters the metabolic response to exercise in trained cyclists. Elevated RER during KET may be indicative of increased ketone body oxidation during exercise, but at the plasma βHB concentrations achieved, ingestion of βHB salts does not affect lactate appearance, perceived exertion, or muscular efficiency. 相似文献
63.
乌头酸酶在三羧酸循环中催化柠檬酸生成异柠檬酸。本文以乌头酸酶为例,深入探讨了酶对对称底物分子进行选择的机理,同时对酶专一性分类系统进行了分析和重新调整。 相似文献
64.
黄晓梅 《Journal of Zhangzhou Technical Institute》2007,9(1):12-15
基于在硫酸介质和十二烷基苯磺酸钠(DBS)存在下,抗坏血酸(ⅤC)活化钒(Ⅴ)催化溴酸钾氧化番红花红O(R)在硝酸纤维素膜固体基质上发射强而稳定的室温燐光的特性,建立了ⅤC活化溴酸钾氧化番红花红O催化固体基质室温燐光法测定痕量钒(Ⅴ)的新方法。钒(Ⅴ)含量在1.6~16fg/斑范围内与△Ip成线性关系,其检出限为0.38fg/斑,该方法灵敏高,成功用于茶叶和人发中痕量钒的测定。同时探讨了催化反应机理。 相似文献
65.
66.
使用飞秒瞬态反射-透射技术研究了金和铜纳米薄膜的电子和晶格动力学,应用双温和Curde近似模型分析了金属薄膜的非平衡热传导动力学.假设在瞬态反射中电子-晶格耦合常数为常数的情况下,计算超快脉冲加热后的电子和晶格温度.金和铜纳米薄膜的反射和透射信号在初始2 ps内相似,随后时间里信号明显不同,透射模式下的电子-晶格耦合效应要比反射模式下的更强和更敏感.这是由于沿着膜厚方向的温度变化受到金属薄膜和基底间的界面散射影响造成的.在研究半透明薄膜的超快动力学过程中,需要同时考虑反射和透射情况. 相似文献
67.
简要评述了陶瓷基板,微波介质陶瓷,铁电压电陶瓷,半导体陶瓷,铁电薄膜和智能材料等功能陶瓷的研究进展和发展趋势,对我院功能陶瓷的发展提出了一些建议。 相似文献
68.
Xi-qiang Li 《上海大学学报(英文版)》2000,4(2):163-166
Single crystal Ga
x
In1−x
As films have grown up on GaAs(100) substrate at 375°C and on InP(100) substrate at 390°C, respectively, by the method of
rf-sputtering with using undoped GalnAs polycrystal as target. However, on Si(100) or Si(111) substrates at 260–390°C, even
at 465°C, only polycrystalline films were obtained. In addition, the structure, composition, electrical characteristic and
optical properties of the Ga
x
In1−x
As films were investigated using X-ray diffraction (XRD), reflection of high energy electron diffraction (RHEED), energy dispersion
analyzer of X-ray (EDAX), Hall measurements and spectroscopic ellipsometry. 相似文献
69.
月经周期除了对生殖功能有影响外,还会影响许多其他的生理机能,在运动中的变化还会影响运动能力.探讨月经周期对能量代谢底物、短时间极量运动和亚极量运动的影响. 相似文献
70.
采用文献综述、文化学和逻辑分析等方法，探讨了传统体育文化的内在特质与人文奥运价值的本质与归位。传统文化的积淀和固有的传统思雏模式形成的本民族传统特色和技艺，在与现代奥林匹克文化的交汇中，其所蕴涵的民族价值观、人文精神、人本思想及其“和谐”的发展观，经多元融合、相互吸纳、补充发展成为现代奥林匹克运动可持续发展的内在动力．．传统体育文化经过创造性的转换，将逐渐回归现代社会，中国传统体育文化期待在与奥林匹克文化相互交融中实现和而不同、和谐发展的历史演变。 相似文献