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Academic literature on the topic 'Two searchlights'
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Journal articles on the topic "Two searchlights"
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Hideki, Toda, and Fujiuti Kouhei. "50 m-range distance and position measurement method by using two searchlights for autonomous flight device." International Journal of Engineering Research & Science 4, no. 7 (2018): 29–35. https://doi.org/10.5281/zenodo.1324112.
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<strong><em>Abstract</em></strong><strong>—</strong> <em>In the present study, 50 m-range distance and position measurement method for autonomous flight device such as four-rotor drone by using two searchlights was proposed, and the precise distance/position measurement performance was evaluated in an outdoor situation. To realize over 10 m long-distance flight of the drone under unstable GPS signal situations such as under the bridge or inside tunnels for periodic inspections, the correct self-position measurement is important for the stable control. This study is to propose a simple method of over 50 m range autonomous four-rotor helicopter movement control using high power 300W two searchlights as InfraRed sources on the ground and the direction of the searchlights sets to the investigation target position such as bridge side. High power light sources of the two searchlights are enabled to measure the correct drone position via an attached drone's camera with an InfraRed filter, and it realizes 1.5 m standard deviation position estimation error when 50 m distance in an outdoor daylight situation. In addition, the limitation of the position detectable condition also measured and analyzed in other experiments. Our proposed method would be effective in the situation that there is no skilled the drone control operator and the flight by visual confirmation of man are hard conditions, and useful to develop the position measurement system with low cost.</em>
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VIGLIETTA, GIOVANNI. "SEARCHING POLYHEDRA BY ROTATING HALF-PLANES." International Journal of Computational Geometry & Applications 22, no. 03 (2012): 243–75. http://dx.doi.org/10.1142/s0218195912500070.
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THE SEARCHLIGHT SCHEDULING PROBLEM was first studied in 2-dimensional polygons, where the goal is for point guards in fixed positions to rotate searchlights to catch an evasive intruder. Here the problem is extended to 3-dimensional polyhedra, with the guards now boundary segments who rotate half-planes of illumination. After carefully detailing the 3-dimensional model, several results are established. The first is a nearly direct extension of the planar one-way sweep strategy using what filling guards, a generalization that succeeds despite there being no well-defined we call notion in 3-dimensional space of planar "clockwise rotation." Next follow two results: every polyhedron with r > 0 reflex edges can be searched by at most r2 suitably placed boundary guards, whereas just r edguards suffice if the polyhedron is orthogonal. (Mini-mizing the number of guards to search a given polyhedron is easily seen to be NP-hard.) Finally we show that deciding whether a given set of boundary guards has a successful search schedule is strongly NP-hard. A number of peripheral results are proved en route to these central theorems, and several open problems remain for future work.
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Rosenthal, Eric I., Amanda L. Holt, and Alison M. Sweeney. "Three-dimensional midwater camouflage from a novel two-component photonic structure in hatchetfish skin." Journal of The Royal Society Interface 14, no. 130 (2017): 20161034. http://dx.doi.org/10.1098/rsif.2016.1034.
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The largest habitat by volume on Earth is the oceanic midwater, which is also one of the least understood in terms of animal ecology. The organisms here exhibit a spectacular array of optical adaptations for living in a visual void that have only barely begun to be described. We describe a complex pattern of broadband scattering from the skin ofArgyropelecussp., a hatchetfish found in the mesopelagic zone of the world's oceans. Hatchetfish skin superficially resembles the unpolished side of aluminium foil, but on closer inspection contains a complex composite array of subwavelength-scale dielectric structures. The superficial layer of this array contains dielectric stacks that are rectangular in cross-section, while the deeper layer contains dielectric bundles that are elliptical in cross-section; the cells in both layers have their longest dimension running parallel to the dorsal–ventral axis of the fish. Using the finite-difference time-domain approach and photographic radiometry, we explored the structural origins of this scattering behaviour and its environmental consequences. When the fish's flank is illuminated from an arbitrary incident angle, a portion of the scattered light exits in an arc parallel to the fish's anterior–posterior axis. Simultaneously, some incident light is also scattered downwards through the complex birefringent skin structure and exits from the ventral photophores. We show that this complex scattering pattern will provide camouflage simultaneously against the horizontal radially symmetric solar radiance in this habitat, and the predatory bioluminescent searchlights that are common here. The structure also directs light incident on the flank of the fish into the downwelling, silhouette-hiding counter-illumination of the ventral photophores.
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Hideki, Toda. "Experimental study on four rotor helicopter 10 m-range distance and position measurement method by using two searchlights for autonomous control and the evaluation." International Journal of Engineering Research & Science 6, no. 5 (2020): 07–15. https://doi.org/10.5281/zenodo.3869071.
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<strong><em>Abstract</em></strong><strong>—</strong><em>This paper reports experimental result of a distance and position measurement method for autonomous movement control of four-rotor helicopters (drones) that uses two spotlights and comparing with a red marker using case, discuss the results of autonomous flight test evaluations. To conduct autonomous drone flights exceeding 10 m under unstable GPS signal situations, such as under bridges or inside tunnels during periodic maintenance inspections, correct self-positioning measurements are indispensable. This study proposes a simple method whereby autonomous drone movement control can be performed over distances exceeding 10 m by using two high-power 100 V alternating current spotlights set on the ground as infrared (IR) light sources. The spotlights are directed at the investigation target, such as the cracked area of a bridge, and the intense light of the two spotlights provides reference points that enable the drone to determine its correct position. In autonomous flight-testing in an enclosed corridor, our method provides capable of determining the drone’s position at distances up to 15 m with a standard deviation of 0.31 m. Our proposed method would be effective in situations where no skilled drone control operator is available and for flights requiring visual cue confirmations under adverse outdoor conditions.</em>
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GRAY, RICHARD. "Writing American Literary History Sacvan Bercovitch (ed.), The Cambridge History of American Literature (Cambridge: Cambridge University Press, 1994–2005, £495.00). Volume One: 1590–1820 (1994, £70.00). Pp. xiii+829. ISBN 0 521 30105 [squf ]. Volume Two: Prose Writing, 1820–1865 (1995, £75.00). Pp. xviii+887. ISBN 0 521 30106 8. Volume Three: Prose Writing, 1860–1920 (2005, £80.00). Pp. xi+813. ISBN 0 521 30107 6. Volume Four: Nineteenth-Century Poetry, 1800–1910 (2004, £75.00). Pp. x+562. ISBN 0 521 30108 4. Volume Five: Poetry and Criticism, 1900–1950 (2003, £75.00). Pp. xi+624. ISBN 0 521 30109 2. Volume Six: Prose Writing, 1910–1950 (2002, £70.00). Pp. xx+620. ISBN 0 521 49731 0. Volume Seven: Prose Writing, 1940–1990 (1999, £75.00). Pp. xxiii+795. ISBN 0 521 49732 9. Volume Eight: Poetry and Criticism, 1940–1995 (1996, £75.00). Pp. viii+545. ISBN 0 521 49733 7." Journal of American Studies 40, no. 2 (2006): 399–411. http://dx.doi.org/10.1017/s0021875806001447.
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Each generation needs to rewrite literary history. And it may be that this generation needs to do it more than most, if only because the proliferation of schools and theories has turned what was once common critical ground into a battlefield. American books, among others, have become a site of struggle, and American writers have been among those caught in the criss-crossing searchlights of ethnic and gender studies, interdisciplinary investigations and studies of popular culture, language and communication. Just how far things have gone can be measured by the fact that every term in the phrase “history of American literature,” is now open to debate. The textuality of history and the historicity of the text have become the most contentious issues in contemporary criticism, while the question of nationhood, in particular, is under scrutiny. In a famous phrase, Walt Whitman described his work as a language experiment, an attempt to summon a nation into being through words. The slippery, plural nature of American identity and the bewildering contingencies of American history that drove Whitman to say this feed into the more challenging of the recent accounts of American writing.
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Otuka, Akira, Masaya Matsumura, and Makoto Tokuda. "Dispersal of the Common Cutworm, Spodoptera litura, Monitored by Searchlight Trap and Relationship with Occurrence of Soybean Leaf Damage." Insects 11, no. 7 (2020): 427. http://dx.doi.org/10.3390/insects11070427.
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The common cutworm, Spodoptera litura Fabricius (Lepidoptera: Noctuidae) is a major pest of soybean. Pheromone traps are used to monitor male adults, but the catch peaks do not always predict leaf damage in soybean fields. Thus, there is no accurate means of forecasting soybean damage, and insecticide is applied on the basis of farmers’ observations of actual damage in fields. To understand the occurrence of soybean leaf damage, the dispersal of S. litura in a soybean field in southwestern Japan was preliminarily investigated using a searchlight trap in comparison to a pheromone trap at one location, from August to mid-October in 2016–2018. To determine the relationship between pest arrival and crop damage, trap catch numbers and the number of soybean leaves damaged by 1st-instar larvae were examined by separately comparing raw numbers and cumulative numbers. The raw catch numbers of the two trap types in August and September 2016 and 2018 preceded subsequent damage peaks by an average of 5.3 days. This temporal difference coincided with the estimated duration of the egg stage plus an assumed mating period. Furthermore, the cumulative catch numbers of the two traps in August and September were linearly associated with cumulative damaged leaves in the same period in each year and in the three-year period. The coefficient of determination (R2) of linear regression between the cumulative catch numbers of the searchlight trap and the cumulative damaged leaves for the three-year period was much higher than that between the cumulative catch of the pheromone trap and cumulative damage. This suggests that soybean leaf damage is closely linked to the number of S. litura arrivals at the survey site. Thus, the searchlight trap captured S. litura arrivals better than the pheromone trap. As the linear regression function of the cumulative catch of the searchlight trap for the three-year period was tentatively correlated with a prefectural economic injury level for soybean fields, it might be feasible to predict S. litura-induced soybean damage using searchlight traps. The cumulative female catch number of the searchlight trap was also linearly associated with damaged leaves, but the coefficient of determination was generally lower than that with the cumulative total catch. The female ratio of searchlight trap catches in September was <0.5 in contrast to S. litura migrating overseas (>0.5). The advantages and disadvantages of the two trapping methods, as well as necessary further studies are discussed. Our findings provide a foundation for S. litura monitoring with searchlight traps.
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Lin, Yan, Lisa Butterfield, William A. LaFramboise, et al. "Comparison of SearchLight and Luminex multiplex assays: A case study of 27 cytokines in 156 melanoma blood serum samples." Journal of Clinical Oncology 30, no. 30_suppl (2012): 79. http://dx.doi.org/10.1200/jco.2012.30.30_suppl.79.
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79 Background: Searchlight and Luminex are two popular multiplex immunoassay platforms. Yet, very few studies have directly compared the performance of these two platforms on real clinical samples. Here we report a case study of 27 cytokines assayed by both platforms on 156 previously banked melanoma serum samples. Methods: Searchlight (Aushon) and Luminex (Invitrogene) assays were carried out according to protocols specified by the manufactures. Intra-experimental coefficients of variation (CV) of the intensities were calculated using the technical duplicates. The detection rate for each marker was calculated based on the cutoffs specified by the manufactures. Spearman’s correlation coefficient (r) was used to quantify the agreement of the measurements of each marker between the two platforms. Wilcoxon signed-rank tests were used to compare CVs and detection rates between the platforms. Results: We observed significantly higher intra-experimental CVs in the Searchlight data (median=8.9%, range=4.9%-11.9%) than in the Luminex data (median=4.1%, range=2%-7.5%, p<0.0001). The CVs were not correlated between platforms (r=-0.08, p=0.69), suggesting that the CVs were not sample specific. We also observed a higher detection rate using the Searchlight platform (median=99%, range=26%-100%) than the Luminex platform (median=94%, range=18%-100%). However, the difference was not statistically significant (p=0.62). Spearman’s r for cytokine concentrations between platforms ranged from -0.13 to 0.86 (mean=0.44). The disagreement for 5 of the 6 cytokines with r<=0.1 can be explained by their standard curves. Conclusions: In this case study of 156 samples, Luminex platform demonstrated significantly better reproducibility measured by CV and the Searchlight platform appeared to be more sensitive measured by the detection rate and the overall range of the measurements. The agreement between the two platforms ranges widely among the markers. Careful examination of the standard curves is critical to interpretation of the cytokine data. Assays of the cytokines by single analyte ELISA is ongoing.
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Gulyaikin, Alexander M., Michael S. Аlimbekov, and Andrey S. Palagushkin. "The Spotlight Based on the Solid-State Laser Light Source." Light & Engineering, no. 04-2023 (August 2023): 78–87. http://dx.doi.org/10.33383/2022-121.
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The spotlight development on the solid-state laser light source is considered in this scientific article. The light sources characteristics are as close as possible to the characteristics and parameters of modern LED light sources. The main aim is to reach the luminous flux value of 3000 lm. That is analogues with the luminous flux of modern LED searchlights. As well as the photometric and electrical parameters, values and determination of the measures to improve the design of the spotlight are of the interest. The spotlight sample has been tested. And the test results show that after the value of 3000 lm reached the main failing of light source is the low value of its luminous efficacy, equal to 57 lm/W. In order to increase the light output of the searchlight, there are the ways of modernization of its construction suggested in the article. The previous results show that the measures suggested will allow us to increase the value of luminous efficacy to 100 lm/W. Besides that, such parameters and characteristics of the spotlight as the correlated colour temperature (CCT), colour rendering index (CRI), wattage, luminous intensity and spectral light distribution are measured and submitted in the article. The obtained energetic characteristics of the sample allow us to conclude that application of such light sources is approved in special conditions. Absence of electronic components in the distant radiation source of white light allows increasing the light source reliability substantially. Therefore, the laser spotlights are acceptable for application in the hard-to-reach places for installation of the lighting equipment, for example, on high places where the equipment demount used for repairing works is too difficult. It is actually to use also the developed light sources at the explosive industrial facilities having the current-transmitting elements of construction, especially having the open contacts. That allows reducing the safety of facility operation significantly.
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Yen, William C. K., and C. Y. Tang. "An optimal algorithm for solving the searchlight guarding problem on weighted two-terminal series-parallel graphs." Acta Informatica 36, no. 2 (1999): 143–72. http://dx.doi.org/10.1007/s002360050156.
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Kowanda, Michelle, Lindsey Cartner, Catherine Kentros, et al. "Availability of Services and Caregiver Burden: Supporting Individuals With Neurogenetic Conditions During the COVID-19 Pandemic." Journal of Child Neurology 36, no. 9 (2021): 760–67. http://dx.doi.org/10.1177/08830738211001209.
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Because of the COVID-19 pandemic, in-person services for individuals with neurodevelopmental disabilities were disrupted globally, resulting in a transition to remote delivery of services and therapies. For individuals with neurogenetic conditions, reliance on nonclinical caregivers to facilitate all therapies and care was unprecedented. The study aimed to (1) describe caregivers’ reported impact on their dependent’s services, therapies, medical needs, and impact on themselves as a result of the COVID-19 pandemic and (2) assess the relationship between the extent of disruption of services and the degree of self-reported caregiver burden. Two online questionnaires were completed by caregivers participating in Simons Searchlight in April and May 2020. Surveys were completed by caregivers of children or dependent adults with neurodevelopmental genetic conditions in Simons Searchlight. Caregivers reported that the impact of the COVID-19 pandemic moderately or severely disrupted services, therapies, or medical supports. The majority of caregivers were responsible for providing some aspect of therapy. Caregivers reported “feeling stressed but able to deal with problems as they arise,” and reported lower anxiety at follow-up. Caregivers reported that telehealth services were not meeting the needs of those with complex medical needs. Future surveys will assess if and how medical systems, educational programs, therapists, and caregivers adapt to the challenges arising during the COVID-19 pandemic.
Books on the topic "Two searchlights"
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Mphahlele, Letlapa. Shining the searchlight inwards: Speeches and articles. Reach Publishers, 2012.
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The electric mirror on ancient Alexandria's Pharos lighthouse and other ancient lighting. Einhorn Press, 2006.
Find full textBook chapters on the topic "Two searchlights"
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Grimm, Stephen R., Rik Peels, and René van Woudenberg. "Method and Interpretation in the Humanities." In A Philosophy of the Humanities. Oxford University PressNew York, NY, 2025. https://doi.org/10.1093/9780197749647.003.0005.
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Abstract In this chapter, after discussing the rule-nature of methods, it is argued that the humanities are home to a variety of methods. Special attention is given to the methods of source criticism. The chapter also discusses which roles theories play in methods, and it argues that they play the roles of searchlights as well as of data organizers. Next it is argued that interpretation, of which various kinds are distinguished (allegical interpretation, authorial interpretation, and Marxist interpretation), to the extent that it involves the application of rules of interpretation (which, the chapter argues, it does) is a method, too. Knowledge through interpretation gained by application of interpretative methods can take two forms: knowledge of the text and knowledge of the world. The chapter discusses how interpretation of texts relates to the interpretation of human behavior and interpretation of works of art.
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"Searchlights." In Making Love to Roget's Wife. University of Arkansas Press, 2001. http://dx.doi.org/10.2307/j.ctv264f8z1.48.
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Mason, Elinor. "Ordinary Praiseworthiness and Blameworthiness." In Ways to be Blameworthy. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198833604.003.0004.
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This chapter defends the connection between subjective rightness and ordinary praiseworthiness. First, merely acting on conscience is not enough for praiseworthiness. On the other hand, merely being motivated towards what is actually good is not enough either. Praiseworthiness, like trying, is subject to a ‘reflexivity requirement’. Nomy Arpaly uses the example of Huck Finn to argue that an agent can be praiseworthy without having a good grasp of morality, and without acting as they believe they ought. On a competing view, the ‘Searchlight View’, full awareness of every relevant aspect of the act at the moment of action is necessary for praise- or blameworthiness. Both of these views fail: Arpaly’s view does not meet the reflexivity requirement, and the Searchlight View meets too strong a version. Some awareness, some background knowledge is required, but it need not be as bright as a searchlight.
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Edmonds, Arianne. "Jefferson in Los Angeles." In We Now Belong to Ourselves. Oxford University PressNew York, 2025. https://doi.org/10.1093/oso/9780197579084.003.0007.
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Abstract This chapter traces the journey of Jefferson from Mississippi to Los Angeles in 1892, where he began his political organizing and civic activism. He founded The Searchlight in 1896, backing Democratic candidate William Jennings Bryan in the silver currency debate, which earned him a controversial position within the Black community. Despite opposition, Jefferson’s commitment to issue-based voting led him to establish The Liberator in 1900, advocating for political independence among African Americans. Jefferson’s platform focused on civic engagement, education, racial upliftment, and encouraging land ownership as a key to economic empowerment. His promise of a better future for Black Americans through self-determination and breaking free from political party allegiance became a central message in his newspaper, inviting his community to dream of a life beyond mere survival.
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Lewis, Tom. "The Wizard War." In Empire of the Air. Cornell University Press, 2021. http://dx.doi.org/10.7591/cornell/9781501759321.003.0012.
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This chapter examines how radio communications and broadcasting became essential to the prosecution of the new war. It argues that the conflict became a chilling “wizard war,” waged with ever more sophisticated scientific instruments of destruction. The chapter investigates the shift from searchlight flashes and semaphore flags to the use of radio and electronics. The Germans began navigating their planes through fog and cloud by fixing them on radio signals transmitted from stations on the continent. The British responded by deflecting the signals with transmissions of their own and sending the planes off course. Radio brought this war into American homes with a vividness and speed never known before. The chapter reveals how radio went across the oceans, too, delivering reports from home to U.S. troops around the world. It then introduces the “alert receiver,” a device that would turn on a radio automatically and ring a bell to summon listeners to hear announcement of an attack.