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51.
《Environmental Communication: A Journal of Nature and Culture》2013,7(2):139-155
The essay interrogates Animal Planet's television show Whale Wars, and the use of footage from that show in a commercial for one of the network's other shows, How Stuff Works, to examine the way these texts interact within the public screen. I argue that the (re)presentation of whale kill footage further instantiates an image event as a commodity and rhetorically reconciles the image event into a capitalist ideology counter to the social movement message constructed on Whale Wars—and by proxy allows the image event to play out only via a profit-motive tied to the death of the whale. 相似文献
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从TM图像自动提取洪涝灾情的研究 总被引:4,自引:1,他引:4
1991年夏我国江淮地区发生特大洪涝灾害,本文报道应用TM图像提取洪涝灾情信息的试验研究结果,发展了一套从TM图像数值分析入手,把TM包含的丰富光谱信息转化为洪涝灾情信息的图像应用处理技术.计算机自动输出的滁河和水阳江两流域洪涝灾情分布图和面积数据经实地验证准确可信. 相似文献
54.
Vanina Pasqualini Christine Pergent-Martini Gérard Pergent 《Journal of Coastal Conservation》1998,4(1):59-66
The beds ofPosidonia oceanica, a marine vascular plant species endemic to the Mediterranean, form a major Mediterranean marine ecosystem. These beds are
well-developed along the sandy east coast of Corsica, where the continental shelf is wide and extends for ca. 100 km. The
upper limit of this ecosystem has been mapped by means of a computer image processing technique using 1/20 000 colour photographs.
One of the major problems for image processing in the marine environment is the impact of the water layer (of variable thickness
and quality), which can result in variations of the spectral signature for a particular vegetation or bottom type. In an attempt
to reduce the impact of this artefact, a processing technique that takes into account bathymetric factors has been tested.
Cartographical data obtained for an area extending from Bastia to Solenzara are presented. In the vicinity of the mouths of
coastal rivers, a systematic indentation of the upper limit of the seagrass beds has been revealed. On the basis of these
results, local variations in the quality of the marine environment can be detected, in particular with regard to salinity,
turbidity and/or the impact of sedimentation. The overall surface area of thePosidonia oceanica beds has also been calculated. 相似文献
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基于面向对象的北京市区城市内部用地信息提取 总被引:1,自引:0,他引:1
选取北京市四环以内为研究区域,以资源三号卫星遥感影像为数据源,针对类型多样、特征易混淆的城市内部用地以及高分辨率遥感影像海量信息、人工提取费时费力等特点,论文基于面向对象分类方法,探讨城市内部用地自动提取方法,并对分类结果进行精度评估.结果表明:利用不同地物的光谱、形状、纹理和空间关系等特征,通过多尺度分割和隶属度函数法,构建合理的分类层次,不仅精确提取出研究区内水体、绿地、建设用地和待开发用地,更独具创新地区分了城市建设用地内部各种地物类型,包括工业生产用地、低密度和高密度生活用地以及交通用地.该方法有效地利用了资源3 号卫星影像的光谱、纹理及空间信息特征,总体精度可达到87.00%,Kappa系数达到0.853 9,取得较好的分类效果. 相似文献
57.
The current industrial pig production model is in crisis, due to its association with environmental pollution, doubtful product quality and lack of animal well-being. In Bretagne (France), a region of intensive pig production, a survey of seven stakeholder groups concerned with pig production was conducted, as part of a research programme dedicated to the assessment of the environmental impact of different modes of pig production. A very large majority of pig producers (93%) and their suppliers (100%) considers pig farms as an asset for the region, whereas a majority of scientists (58%), activists (78%) and consumers (54%) sees it as a handicap. Differences among stakeholder groups are minor with respect to the perceived importance of environmental and social issues. Stakeholders agree on the relative level of responsibility of pig farms with respect to specific problems. For all groups unpleasant odours and water quality come first with respect to responsibility, for most groups soil quality comes second, followed by product safety and air quality. For a future improved mode of pig production, 76% of pig producers and their suppliers prefer to adapt the current model, for all other groups the majority prefers an alternative model. While pig producers and their suppliers prefer a slurry-based housing system, all other groups prefer a straw-based system. Pig producers see the slurry-based system as technically superior and associate the straw-based system with poor working conditions, whereas consumers associate the slurry-based system in the first place with poor water quality and associate the straw-based system with less pollution. These results will be of use in the research programme on the environmental impact of modes of pig production, as they indicate the environmental impacts to be considered and their relative importance. The results will also help in deciding which options should be assessed. It is concluded that the poor image of the current pig production model and its production practices with consumers does not seem compatible with a sustainable demand for pork products. 相似文献
58.
Teruhito Otsuka Hiroyasu Saitoh Takaaki Mizutani Kaoru Morimoto Norihiko Yoshikawa 《Journal of Loss Prevention in the Process Industries》2007,20(4-6):427-432
Deflagration phenomena in hydrogen–air mixtures initially filled in 1.4 m3 spherical latex balloons were measured using a high-speed digital video camera and pressure transducers. The image velocimetry using brightness subtraction was introduced to eliminate the background effects for obtaining accurate time evolution records of flame propagation velocity. The maximum flame propagation velocity of about 100 m/s was observed with maximum overpressure 15 kPa at 1 m from ignition point. According to the detailed flame propagation velocity records, there were long deceleration durations. The observed maximum overpressure was smaller than the overpressure estimated by the basis of the observed maximum flame propagation velocity and the pressure wave theories of spherical flames. A new blast curve plot of scaled overpressure vs. distance was tentatively proposed. 相似文献
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60.
The present study discusses experiments on organic dust explosions in a setup with low wall influence. The proposed apparatus decouples the dust dispersion and the deflagration event in two separate compartments. The use of a continuous-wave laser to illuminate the centre plane of the observation chamber allows capturing both, the dust cloud and the flame during the same experiment and eliminates typical problems caused by the limited dynamic range of high-speed cameras. A k-means clustering method is used for image segmentation to obtain the spatial extent and the propagation velocities of the unreacted particle cloud and the flame zone. Spatially resolved velocities are calculated by the additional use of an optical flow method. The main goal of the presented setup and image processing method is to provide high quality validation data for the development of numerical models on dust deflagration. 相似文献