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When your car’s “Check Engine” light comes on, it’s usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. But in many cases, it means at minimum that you’ll be visiting the car dealer to locate the malfunction and get the light turned off. Like light waves, water waves emerging from two sources interferes in the space surrounding the sources to produce a pattern of nodes and antinodes lying along lines. The diagram at the right represents the interference pattern created by two water waves. The waves were created by two objects bobbing up and down in phase at the same frequency. Point P on the pattern is a distance of 34.0 cm from S1 and 23.8 cm from S2. Determine the wavelength (in cm) of the water waves. It is worthwhile to quickly note that, as with most transformational technologies, nighttime lighting has not always been met with open arms. Hasenöhrl (2014 Hasenöhrl, U. (2014). Lighting conflicts from a historical perspective. In J. Meier, U. Hasenöhrl, K. Krause, & M. Pottharst (Eds.), Urban lighting, light pollution, and society (pp. 105–124). New York, NY: Taylor & Francis. [Google Scholar], p. 105) notes that while the introduction of new lighting technologies was in general positively received, this did not imply universal endorsement or ‘a universal devaluation of the “dark night” as a whole’. The consequences of artificial nighttime lighting have been under debate since the nineteenth century, and some criticisms of artificial nighttime lighting can be found even earlier.55. Criticisms can be found as early as 1662, when a London pastor stated ‘We ought not to turn day into night, nor night into day … without some very special and urgent occasion’ (Ekirch, 2005 Ekirch, R. A. (2005). At day’s close: Night in times past. New York, NY: W. W. Norton & Company Inc. [Google Scholar], p. 74). This was due to the disruption of the perceived natural (Christian) order that such lighting may cause. However, most criticisms are found in the nineteenth century onward, and specifically around times of transition between technologies. Early objections were often esthetic, however moral objections can also be found (Hasenöhrl, 2014 Hasenöhrl, U. (2014). Lighting conflicts from a historical perspective. In J. Meier, U. Hasenöhrl, K. Krause, & M. Pottharst (Eds.), Urban lighting, light pollution, and society (pp. 105–124). New York, NY: Taylor & Francis. [Google Scholar]). There are documented criticisms of artificial nighttime lighting in astronomy-related literature as early as 1866 (Sperling, 1991 Sperling, N. (1991). The disappearance of darkness. In D. L. Crawford (Ed.), Light pollution, radio interference, and space debris (Vol. 17, pp. 101–108). San Francisco, CA: Astronomical Society of the Pacific Conference Series. [Google Scholar]). Already in the 1880s, Alexander Pelham Tottler—generally regarded as the originator of the scientific study of lighting—identified issues with street lighting that predict modern debates. For example, he argued that too much light is wasted, and that glare causes safety concerns (Bowers, 1998 Bowers, B. (1998). Lengthening the day: A history of lighting technology. Oxford: Oxford University Press. [Google Scholar]). Naturalists and artists expressed ambiguity (at best) towards artificial light as early as the 1920s (Nye, 1990 Nye, D. E. (1990). Electrifying America: Social meanings of a new technology, 1880–1940. Cambridge: MIT Press. [Google Scholar]), and by this time there were already some calls for lighting engineers to reduce urban brightness (Isenstadt, 2014 Isenstadt, S. (2014). Good night. Places Journal. Retrieved 22 October, 2014, from https://placesjournal.org/article/good-night/[Crossref] [Google Scholar]).View all notes The most outspoken critics have been astronomers, as reduced stellar visibility has been a long-noticed effect of urban lighting (Sperling, 1991 Sperling, N. (1991). The disappearance of darkness. In D. L. Crawford (Ed.), Light pollution, radio interference, and space debris (Vol. 17, pp. 101–108). San Francisco, CA: Astronomical Society of the Pacific Conference Series. [Google Scholar]). Still, in the larger narrative of lighting technologies these objections were the exception—nighttime lighting was mostly seen as necessary and desirable for modern urban life (Hasenöhrl, 2014 Hasenöhrl, U. (2014). Lighting conflicts from a historical perspective. In J. Meier, U. Hasenöhrl, K. Krause, & M. Pottharst (Eds.), Urban lighting, light pollution, and society (pp. 105–124). New York, NY: Taylor & Francis. [Google Scholar]). Click a vehicle warning light to see more detailed information. Report a street light problem The Dark-Sky Association was started to reduce the light going up into the sky which reduces visibility of stars (see Skyglow below). This is any light which is emitted more than 90° above nadir. By limiting light at this 90° mark they have also reduced the light output in the 80–90° range which creates most of the light trespass issues. With electric light, the illumination of our urban nightscapes was effectively realized. But with this realization, a critical shift in perception was occurring underneath the spread of electricity. As new generations were born into a world of abundant electric light, it began losing its mysticism. Electric lighting, once dazzling and even otherworldly, began fading into banality as early as the 1920s (Isenstadt, 2014 Isenstadt, S. (2014). Good night. Places Journal. Retrieved 22 October, 2014, from https://placesjournal.org/article/good-night/[Crossref] [Google Scholar]). By the 1930s, light was no longer considered a spectacle but sank into the background of everyday life (Nye, 1990 Nye, D. E. (1990). Electrifying America: Social meanings of a new technology, 1880–1940. Cambridge: MIT Press. [Google Scholar]). An abundance of light has become the expectation for urban nights in North America and Europe. As a consequence of this shift, lighting infrastructure went (and remains) largely unnoticed. It is only when lighting fails (e.g. power outages) or during unique displays that we notice the technology. With minimal alternatives for lighting, parents and children from rural areas in developing countries are often caught in the cycle of poverty. In particular, fuel-based lighting (kerosene) is expensive, dangerous and unhealthy while providing poor illumination and contributing to carbon emissions. If there is a problem with the electricity supply, we will need to inform the electricity supplier and could take more time to fix the light. eService – Report damaged streetlights  Street lights we are responsible for  We are responsible for maintaining street lights on all adopted highways. An adopted highway is a road, footpath or bridleway that is maintained at public expense, usually by the highway authority. With our novel question in mind, we must then ask how the concept of light pollution frames current challenges and associated ethical questions, and what actions it will guide us toward. However, it is pertinent to first clarify the notion of ‘framing’. Here, I use the term broadly to describe the conceptual lens through which problems will be defined and perceived, and through which solutions will be posed. Frames are helpful in crystallizing and formulating a problem, but in doing so also set the boundaries of possibility on potential solutions. In Frame Innovation (2015 Dorst, K. (2015). Frame innovation: Create new thinking by design. Cambridge: The MIT Press. [Google Scholar]), Dorst explains a method of design thinking used to overcome seemingly intractable real-world problems, dubbed the ‘frame creation model’. Building on the linguistic research of Lakoff and Johnson (1980 Lakoff, G., & Johnson, M. (1980). Metaphors We live by. Chicago, IL: The University of Chicago Press.[Crossref] [Google Scholar]), Dorst explains that frames may be simple phrases, but in reality are subtle and complex thought tools. ‘Proposing a frame includes the use of certain concepts, which are assigned significance and meaning. These concepts are not neutral at all: they will steer explorations and perceptions in the process of creation’ (2015 Dorst, K. (2015). Frame innovation: Create new thinking by design. Cambridge: The MIT Press. [Google Scholar], p. 63). A good frame should be inspiring, original, robust, and create a common space for finding solutions. And once accepted, a frame will define the parameters of possibility. ‘Once frames are accepted, they become the context for routine behavior: once accepted, the frame immediately begins to fade. Statements that started life as original frames become limiting rationalities in themselves, holding back new developments’ (Dorst, 2015 Dorst, K. (2015). Frame innovation: Create new thinking by design. Cambridge: The MIT Press. [Google Scholar], p. 65). Maxman el macho eracto VigRX Plus Testo Ultra Masculin Active Atlant Gel machoman TestX Core erogan

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