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41.
This work illustrates the discrete vortex method (DVM) as a tool for simulating environmental fluid mechanics problems involving transport in the wake of a bluff body. The DVM was used to model both the long-time-averaged and instantaneous features of flow past a circular cylinder. Simulations were performed for Re = 140, 000. Verification testing was accomplished by refining time-step and vortex element circulation. The DVM was validated through comparison with experimental data from Cantwell and Coles. Verification testing demonstrated that, while global convergence is not possible for an unsteady flow simulation, it is possible to have convergence to physical results. This verification entails identifying a range of parameters in which a flow containing coherent structures and matching physical conditions is attainable. Validation tests demonstrated excellent agreement between experimental and simulated results for time-averaged velocity and shear stress profiles, as well as Strouhal number. 相似文献
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金山店铁矿平行矿体地下开采地表沉降物理模拟预测研究 总被引:3,自引:0,他引:3
根据金山店铁矿张福山矿区平行矿体的赋存特点,采用物理相似模拟方法,研究和预测了矿体地下开采过程中地表的沉降和位移规律。研究结论对于矿山安全地安排井下采矿生产、适时地进行地面建(构)筑物的搬迁以及土地的征购等,具有指导意义。 相似文献
44.
Of Bodies, Place, and Culture: Re-Situating Local Food 总被引:1,自引:0,他引:1
Laura B. Delind 《Journal of Agricultural and Environmental Ethics》2006,19(2):121-146
In the US, an increasingly popular local food movement is propelled along by structural arguments that highlight the inequity
and unsustainablity of the current agri-food system and by individually based arguments that highlight personal health and
well-being. Despite clear differences in their foci, the deeper values contained in each argument tend to be neglected or
lost, while local innovations assume instrumental and largely market-based forms. By narrowing their focus to the rational
and the economic, movement activists tend to overlook (or marginalize) the role of the sensual, the emotional, the expressive
for maintaining layered sets of embodied relationships to food and to place. This paper seeks to show that cultural and nonrational
elements are fundamental to local food discussions. It proceeds from the assumption that, without them as full partners, the
movement cannot be sustained in any felt, practiced, or committed way. To this end, it discusses the concept of place and
bodies in place, as well as the connections between the ecological and the cultural, the sensual and the scientific. It offers
a new set of questions and conceptual tools with which advocates and activists may “ground,” and thereby revalue and restore,
the promise and practice of local food. 相似文献
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武汉东湖水生植物生态学研究:Ⅲ沉水植被重建的可行性研究 总被引:6,自引:0,他引:6
根据武汉东湖水体光学性质,营养状况和东湖现存水生植被的分布状况,对东湖各湖区重建沉水植被的可行性作了探讨,认为东湖大部分湖区恢复沉水植物是可行的。牛巢湖,汤林湖,后湖等湖区一旦停止放养草食性鱼类,加之适当的人工促进措施,沉水植物完全可以恢复。 相似文献
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以再生水为补水的景观水体水华爆发特征调查和药剂应急控藻效果评价 总被引:1,自引:0,他引:1
采用现场调查和实验室验证的方法,对以再生水为景观补水的水华优势藻进行了分析。2年的现场调查表明,再生水在条件适合时极易发生水华,且水华的优势藻以小球藻为主。在实验室针对小球藻和铜绿微囊藻进行了竞争生长实验研究,在再生水的氮磷浓度范围内小球藻生长快于铜绿微囊藻,这也验证了再生水作为景观水补水时小球藻是优势藻现场调查结论。针对水华爆发初期和水华爆发验证时2种条件,比较研究了4种以化学成分为主的抑藻药剂对以小球藻为水华特征藻的控藻效果。结果表明,这4种药剂对水华的控制均具有一定的效果,并且水华初期实施药剂抑藻,药剂投加少,且效果好。对4种药剂进行急性毒性实验,只有S2一种药剂在安全浓度时对水华爆发初期有抑藻效果。 相似文献
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Surprisingly little attention is paid to the role of digital technology and related forms of data production, storage, processing, and sharing in humanitarian governance. This paper uses Michael Barnett's ( 2013 ) conceptualisation of humanitarian governance when arguing for a better accounting of technology in literature on humanitarian governance. Specifically, it proposes a two‐fold alertness to governance of (a) the uses of new technology and (b) that which is produced by digital technologies. This elucidates important issues, including that of access to digitalised data collected from humanitarian subjects, with implications for their (in)security. The paper concludes by suggesting that access is no longer ‘only’ about challenges of gaining access to vulnerable populations, but also about challenges of preventing access to vulnerable digital bodies and their use for aggressive purposes. In short, access and protection acquire a new dimension and analyses of humanitarian governance must be more attentive to the role of digital technology. 相似文献
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随着城市经济的快速发展,多数城市河流均受到不同程度的污染。2012年1月—2013年7月采用外循环技术对受污染的常州市景观河流进行水质改善研究,结果表明:河道ρ(TN)由14.6~16.0 mg/L降到5.08~5.78 mg/L,ρ(NH3-N)由11.1~13.5 mg/L降到0.92~1.06 mg/L,ρ(COD)由74.5~95.2 mg/L降到20.2~21.0 mg/L,ρ(TP)由1.22~1.23 mg/L降到0.218~0.220 mg/L。该景观河水质指标除总氮外,其余均达到GB 3838—2002《地表水环境质量标准》IV类标准。 相似文献