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网球大师 2008年第9期 18-18页

作者： jon Wertheim 《体育画报》

我曾说网球被纳入奥运会是个错误,现在我发现自己肯定属于少数派,但我仍然认为奥运网球没多大意义。这并不是丑陋的美国主义,也不是因为奥运会破坏了美网系列赛的完整性。对于一个在奥运会中的项目,金牌应该体现该运动的巅峰,是对运动... 详细信息

我曾说网球被纳入奥运会是个错误,现在我发现自己肯定属于少数派,但我仍然认为奥运网球没多大意义。这并不是丑陋的美国主义,也不是因为奥运会破坏了美网系列赛的完整性。对于一个在奥运会中的项目,金牌应该体现该运动的巅峰,是对运动员成就的最高肯定。而在网球世界,奥运会甚至排不上前四,显然四大满贯的重要性都在奥运会之前。

关键词：奥运会网球比赛奥运村跳水运动员选手篮球美国主义肯定北京特殊价值

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测量角速率

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工业设计 2009年第10期 17-页

作者： jon Titus

测试专家分享数据采集和分析方面的宝贵经验常用于测量角位置或者静态加速度的微型电子机械系统(MEMS)的结构类型,也可以被用于测量每秒/度的角速率。

关键词：角速率 MEMS 科里奥利效应回转仪

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Microalgae Cultivation Using Offshore Membrane Enclosures for Growing Algae (OMEGA)

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Journal of Sustainable Bioenergy Systems 2013年第1期3卷 18-32页

作者： Patrick Wiley Linden Harris Sigrid Reinsch Sasha Tozzi Tsegereda Embaye Kit Clark Brandi McKuin Zbigniew Kolber Russel Adams Hiromi Kagawa Tra-My Justine Richardson John Malinowski Colin Beal Matthew A. Claxton Emil Geiger jon Rask J. Elliot Campbell jonathan D. Trent Advanced Organic Methods Penryn USA Department of Chemistry University of California Santa Cruz USA Department of Mechanical Engineering University of Nevada Reno USA Department of Ocean Sciences University of California Santa Cruz USA Dynamac Corporation NASA Ames Research Center Moffett Field USA NASA Ames Research Center Moffett Field USA School of Engineering University of California Merced USA SETI Institute Mountain View USA Universities Space Research Association Columbia USA

OMEGA is a system for cultivating microalgae using wastewater contained in floating photobioreactors (PBRs) deployed in marine environments and thereby eliminating competition with agriculture for water, fertilizer, and land. The offshore placement in protected bays near coastal cities co-locates OMEGA with wastewater outfalls and sources of CO2-rich flue gas on shore. To evaluate the feasibility of OMEGA, microalgae were grown on secondary-treated wastewater supplemented with simulated flue gas (8.5% CO2 V/V) in a 110-liter prototype system tested using a seawater tank. The flow-through system consisted of tubular PBRs made of transparent linear low-density polyethylene, a gas exchange and harvesting column (GEHC), two pumps, and an instrumentation and control (I&C) system. The PBRs contained regularly spaced swirl vanes to create helical flow and mixing for the circulating culture. About 5% of the culture volume was continuously diverted through the GEHC to manage dissolved oxygen concentrations, provide supplemental CO2, harvest microalgae from a settling chamber, and add fresh wastewater to replenish nutrients. The I&C system controlled CO2 injection and recorded dissolved oxygen levels, totalized CO2 flow, temperature, circulation rates, photosynthetic active radiation (PAR), and the photosynthetic efficiency as determined by fast repetition rate fluorometry. In two experimental trials, totaling 23 days in April and May 2012, microalgae productivity averaged 14.1 ± 1.3 grams of dry biomass per square meter of PBR surface area per day (n = 16), supplemental CO2 was converted to biomass with >50% efficiency, and >90% of the ammonia-nitrogen was recovered from secondary effluent. If OMEGA can be optimized for energy efficiency and scaled up economically, it has the potential to contribute significantly to biofuels production and wastewater treatment.