Relevant bibliographies by topics / Bortle scale

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Bortle scale'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 July 2025

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Journal articles on the topic "Bortle scale"

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Raisal, Abu Yazid, Hariyadi Putraga, Muhammad Hidayat, and Arwin Juli Rakhmadi. "Pengukuran Kecerahan Langit Arah Zenit di Medan dan Serdang Bedagai Menggunakan Sky Quality Meter." JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) 5, no. 1 (2021): 51–58. http://dx.doi.org/10.30599/jipfri.v5i1.835.

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Light pollution is a worldwide problem that affects fewer stars that can be seen at night. This study aims to measure the brightness of the sky in the zenith direction to minimize the effect of light pollution in observing celestial bodies. The research used the observation method of sky brightness level with SQM. Measurement of sky brightness was carried out in two places, namely in Medan and Serdang Bedagai. The SQM is mounted in a zenith direction and set to retrieve data every two seconds. Observations were made on November 10-13, 2018, during the new moon phase. The average value of sky b
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Góez Therán, C., and S. Vargas Domínguez. "COMPARATIVE ANALYSIS OF SKY QUALITY AND METEOROLOGICAL VARIABLES DURING THE TOTAL LUNAR ECLIPSE ON 14-15 APRIL 2014 AND THEIR EFFECT ON QUALITATIVE MEASUREMENTS OF THE BORTLE SCALE." Revista Mexicana de Astronomía y Astrofísica 57, no. 1 (2021): 57–66. http://dx.doi.org/10.22201/ia.01851101p.2021.57.01.03.

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A total lunar eclipse plausibly has an influence on the variation of some environmental physical parameters, specifically on the conditions of the sky brightness, humidity and temperature. During the eclipse on 14th - 15th April 2014, these parameters were measured with a photometer and a weather station. The obtained results allow the comparison, practically, of the optimal conditions for observational astronomy work in the Tatacoa desert and, therefore, to certify it as suitable place to develop night sky astronomical observations. This investigation determined, to some extent, the suitabili
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Gronkowski, P., I. Tralle, and M. Wesołowski. "Visibility of comets during their outbursts and the night sky light pollution—Use the Bortle scale." Astronomische Nachrichten 339, no. 1 (2017): 37–45. http://dx.doi.org/10.1002/asna.201713387.

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Kuang, Jinping, Lijun Ren, and Qian Wu. "A Study on the Severity of Global Light Pollution Based on Comprehensive Evaluation." Highlights in Science, Engineering and Technology 64 (August 21, 2023): 67–73. http://dx.doi.org/10.54097/hset.v64i.11247.

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The widespread use of artificial light at night has improved the quality of human life, but it has also brought about a global light pollution problem with profound and complex ecological, human and economic impacts. To measure the severity of light pollution, a new light pollution risk index was developed in this paper. Three main aspects of light pollution impacts were considered: economic level (EL1), ecological level (EL2) and social level (SL), and six tertiary levels were identified under the secondary evaluation indicators. Then, the light pollution risk indices of these four areas were
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Changruenngam, T., D. Deetha, C. Sukkai, P. Youyuenyong, N. Sarotsakulchai, and F. Surina. "The first dark sky map of Chiang Rai : three decades of change affecting Astro-tourism." Journal of Physics: Conference Series 2653, no. 1 (2023): 012027. http://dx.doi.org/10.1088/1742-6596/2653/1/012027.

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Abstract We present the first Chiang Rai dark sky map, measurements of the calibrated zenith artificial night sky brightness at sea level, which covers data since 1992–2021. The Data were collected from two US satellites including the Defense Meteorological Satellite Program with the Operational Line Scan System (DMSP-OLS) and the Suomi National Polar-orbiting Partnership with the Visible Infrared Imaging Radiometer Suite (NPP-VIIRS). Images containing ratios of artificial light to natural light were originally excluded from sunlight, solar glare, moon light, lunar illuminance, lightning featu
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Nurnadiyah Syuhada and Ayu Purwati. "Feasibility Study of the Rooftop of the Research Center Building at the State Islamic University of Mataram as a Location for Rukyatul Hilal." AL - AFAQ : Jurnal Ilmu Falak dan Astronomi 6, no. 1 (2024): 119–36. https://doi.org/10.20414/afaq.v6i1.10495.

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Abstract: This study aims to evaluate the feasibility of the UIN Mataram Research Center building as a site for moon sighting (rukyatul hilal) based on geographic and meteorological conditions. The research uses a descriptive qualitative method, including direct field observations, data from the Meteorology, Climatology, and Geophysics Agency (BMKG), and analysis of accessibility, light pollution, western horizon visibility, and elevation. Geographically, the Research Center is in the center of Mataram city at coordinates 8° 36' S and 116° 8' E, about 3 km from the coast with a clear view to t
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Çakal, Gaye. "Production of fine zinc borate in industrial scale." Chemical Industry and Chemical Engineering Quarterly 18, no. 4-1 (2012): 547–53. http://dx.doi.org/10.2298/ciceq120224031c.

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In this study, zinc borate production in an industrial scale batch reactor was carried out at the optimum process conditions determined in the previous studies performed at the laboratory and pilot scale reactors. The production was done via the heterogeneous reaction of boric acid and zinc oxide. The samples were characterized by chemical analysis, XRD, TGA, SEM and particle size distribution. The final product which was obtained in the industrial scale reactor was 2ZnO.3B2O3.3H2O. The kinetic data for the zinc borate production reaction fit to a modified logistic model where the lag time was
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Ramachandran, P. Veeraraghavan, Hitesh Mistry, Ameya S. Kulkarni, and Pravin D. Gagare. "Ammonia-mediated, large-scale synthesis of ammonia borane." Dalton Trans. 43, no. 44 (2014): 16580–83. http://dx.doi.org/10.1039/c4dt02467b.

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Simagina, V. I., A. M. Ozerova, O. V. Komova, et al. "Cobalt boride catalysts for small-scale energy application." Catalysis Today 242 (March 2015): 221–29. http://dx.doi.org/10.1016/j.cattod.2014.06.030.

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Zhang, Zhiyu. "Processes and technologies in fabrication of a large-scale freeform silicon carbide space-borne mirror." Chinese Optics Letters 13, Suppl. (2015): S22207. http://dx.doi.org/10.3788/col201513.s22207.

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Dissertations / Theses on the topic "Bortle scale"

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Ковальська, Вікторія Володимирівна. "Analysis of the light pollution in the city of Kyiv." Thesis, Національний авіаційний університет, 2020. https://er.nau.edu.ua/handle/NAU/49682.

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Робота публікується згідно наказу ректора від 21.01.2020 р. №008/од "Про перевірку кваліфікаційних робіт на академічний плагіат у 2019-2020 навчальному році". Керівник роботи: доцент кафедри екології, к.т.н., Радомська Маргарита Мирославівна<br>Object of research – processes of pollution formation under the influence of artificial light sources. Aim оf work – assessment of the light pollution level and its impact on environment. Mehods of research: methods of analysis of sky by Bortle scale; comparative analysis of the obtained values of light level in the Kyiv city<br>У наш час штучні джере
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Ковальська, Вікторія Володимирівна. "Analysis of the light pollution in the city of Kyiv." Thesis, Національний авіаційний університет, 2020. https://er.nau.edu.ua/handle/NAU/44801.

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Робота публікується згідно наказу ректора від 21.01.2020 р. №008/од "Про перевірку кваліфікаційних робіт на академічний плагіат у 2019-2020 навчальному році". Керівник роботи: доцент кафедри екології, к.т.н., Радомська Маргарита Мирославівна<br>Object of research – processes of pollution formation under the influence of artificial light sources. Aim оf work – assessment of the light pollution level and its impact on environment. Mehods of research: methods of analysis of sky by Bortle scale; comparative analysis of the obtained values of light level in the Kyiv city<br>У наш час штучні джере
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Black, Christopher. "Mould Resistance of Full Scale Wood Frame Wall Assemblies." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2839.

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The primary objective of this study was to investigate mould growth resistance of different types of wood products which include the sheathing and framing within full scale wall assemblies. Secondary objectives were to investigate the difference in mould growth resistance between borate-treated and untreated wood products as well as provide information about mould growth under different temperature and humidity conditions for treated and untreated wood products. <br /><br /> The objective of the study is to better understand mould growth, and to examine the effects of varying high moi
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Pintori, Giovanna. "Relaxation dynamics in borate glass formers probed by photon correlation at the microscopic and macroscopic length scale." Doctoral thesis, Università degli studi di Trento, 2017. https://hdl.handle.net/11572/368421.

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X-ray photon correlation is used to probe the dynamics of the strong glass former boron trioxide and of a series of alkali borate glasses, (M2O)x(B2O3)1-x where M is the alkali modifier (M=Li, Na and K). The decay times Ï„ of the obtained correlation functions in B2O3 are consistent with visible light scattering results and independent of the incoming beam intensity in the undercooled liquid phase; are instead temperature independent and show a definite dependence on the X-ray beam intensity in the glass. We are therefore witnessing an atomic dynamics induced by the X-ray beam. Furthermore, we
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Pintori, Giovanna. "Relaxation dynamics in borate glass formers probed by photon correlation at the microscopic and macroscopic length scale." Doctoral thesis, University of Trento, 2017. http://eprints-phd.biblio.unitn.it/2606/1/Thesis_Pintori.pdf.

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X-ray photon correlation is used to probe the dynamics of the strong glass former boron trioxide and of a series of alkali borate glasses, (M2O)x(B2O3)1-x where M is the alkali modifier (M=Li, Na and K). The decay times τ of the obtained correlation functions in B2O3 are consistent with visible light scattering results and independent of the incoming beam intensity in the undercooled liquid phase; are instead temperature independent and show a definite dependence on the X-ray beam intensity in the glass. We are therefore witnessing an atomic dynamics induced by the X-ray beam. Furthermore, we
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Storti, Enrico. "Functionalization of carbon-bonded ceramic foam filters with nano-scaled materials for steel melt filtration." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-235114.

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In order to improve the purity of steel castings, the use of special reactive coatings on carbon-bonded ceramic foam filters was explored. Carbon nanotubes were dispersed in water by means of ultrasonic treatment, using xanthan gum to stabilize the nanotubes in suspension and control the rheological behavior. The coatings were applied by cold spraying and binding was achieved during heat treatment in reducing atmosphere, thanks to an artificial pitch added to the slurry. The coated filters were successfully immersed in molten steel for different times. The thickness of the first alumina layer
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Zhu, Jingwen. "Study of B-H agostic interactions andc onsequence sfor hydrogen storage." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS182/document.

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Dans le cadre de la recherche de vecteurs d'énergie “propres”, le borazane et ses dérivés amine-boranes sont devenus des candidats intéressants en tant que matériaux de stockage de l'hydrogène en raison de leur pourcentage massique relativement élevé en hydrogène (19,6% pour borazane) et de la réversibilité potentielle de la réaction de déshydrogénation. Pour des applications réelles, le contrôle des réactions se produisant à la température ambiante est fondamental. Dans ce contexte, la compréhension du processus de la déshydrogénation/déshydrocouplage catalytique de l'amine-borane apparaît co
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Mathebula, Dephney. "Multi-Scale Modelling of Vector-Borne Diseases." Thesis, 2018. http://hdl.handle.net/11602/1252.

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PhD (Mathematics)<br>Department of Mathematics and Applied Mathematics<br>In this study, we developed multiscale models of vector-borne diseases. In general, the transmission of vector-borne diseases can be considered as falling into two categories, i.e. direct transmission and environmental transmission. Two representative vector-borne diseases, namely; malaria which represents all directly transmitted vector-borne diseases and schistosomiasis which represents all environmentally transmitted vector-borne diseases were studied. Based on existing mathematical modelling science base, we est
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Pontbriand-Paré, Olivier. "Influence de la structure du paysage sur les communautés de parasitoïdes de la tordeuse des bourgeons de l’épinette." Thèse, 2017. http://hdl.handle.net/1866/19556.

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Books on the topic "Bortle scale"

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Bentley, Tony. Prevention of infection. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0349.

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Medicine is the science of diagnosing, treating, and preventing disease; its focus is the needs of an individual patient. Public health is the science and practice of protecting and improving the health of a community—medicine on a larger scale. The aim of government should be to create the health and happiness of its people. Politics is, therefore, public health medicine on a grand scale. Likewise, prevention of infection can be seen as an individual issue, a population issue, or a global issue. The principles of prevention of infection, whether at the level of the individual patient or at th
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Swanepoel, R., and J. T. Paweska. Rift Valley fever. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198570028.003.0043.

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Rift Valley fever (RVF) is an acute disease of domestic ruminants in mainland Africa and Madagascar, caused by a mosquito borne virus and characterized by necrotic hepatitis and a haemorrhagic state. Large outbreaks of the disease in sheep, cattle and goats occur at irregular intervals of several years when exceptionally heavy rains favour the breeding of the mosquito vectors, and are distinguished by heavy mortality among newborn animals and abortion in pregnant animals. Humans become infected from contact with tissues of infected animals or from mosquito bite, and usually develop mild to mod
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Book chapters on the topic "Bortle scale"

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Venkatesan, Malabi M., and Valerie Burland. "Genome-Scale Analysis of Virulence Plasmids: the Contribution of Plasmid-Borne Virulence Genes to Enterobacterial Pathogenesis." In Plasmid Biology. ASM Press, 2014. http://dx.doi.org/10.1128/9781555817732.ch18.

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Chapman, J. R. "Model-Scale Measurements of the Transmission and Radiation of Hull-Borne Vibrational Energy Using Frequency/Wavenumber Analysis." In Shipboard Acoustics. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3515-0_9.

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Aiazzi, Bruno, Luciano Alparone, Lessandro Barducci, Stefano Baronti, Roberto Carlà, and Ivan Pippi. "Aspects of Multi-Scale Analysis for Managing Spectral and Temporal Coverages of Space-Borne High-Resolution Images*." In Machine Vision and Advanced Image Processing in Remote Sensing. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60105-7_5.

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Balokhonov, Ruslan R., and Varvara A. Romanova. "Microstructure-Based Computational Analysis of Deformation and Fracture in Composite and Coated Materials Across Multiple Spatial Scales." In Springer Tracts in Mechanical Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_17.

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AbstractA multiscale analysis is performed to investigate deformation and fracture in the aluminum-alumina composite and steel with a boride coating as an example. Model microstructure of the composite materials with irregular geometry of the matrix-particle and substrate-coating interfaces correspondent to the experimentally observed microstructure is taken into account explicitly as initial conditions of the boundary value problem that allows introducing multiple spatial scales. The problem in a plane strain formulation is solved numerically by the finite-difference method. Physically-based
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Klun, Mateja, Jakob Šušteršič, Rok Ercegovič, Matjaž Mikoš, and Andrej Kryžanowski. "Underwater Abrasion Resistance of Fibre Reinforced-Latex Modified Concrete with Granulated Rubber." In Springer Proceedings in Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-72955-3_49.

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AbstractIn this paper, we present and discuss the initial results of a large-scale research project involving laboratory and field investigations of abrasion resistance of different types of concrete. The decision to study in more detail the abrasion resistance of fibre-reinforced concrete with granulated rubber was based on the results of previous research projects, as well as on observations on the behaviour of concretes placed in the spillways of hydro power plants loaded with water and water-borne particles. Gravel aggregate, steel, polypropylene fibres, and granulated rubber were used to
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Bernardis, P., S. Masi, B. Melchiorri, and F. Melchiorri. "Balloon-Borne Observations of CMB Anisotropies at Intermediate Angular Scales, at Submm and MM Wavelengths." In Observational Tests of Cosmological Inflation. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3510-8_47.

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Chakrabortty, Pradipta, Nitish Jauhari, Raja Kumar, and Diego Maria Barbieri. "Sustainable Vibration Screening with Dual Trenches Infilled with Geofoam and Aggregate: Full-Scale Field Experiments." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_122.

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AbstractGround-borne vibrations resulting from various civil engineering activities can cause detrimental impacts on the nearby structures. Therefore, past studies have concentrated on developing vibration mitigation techniques. Vibration screening using wave barriers is a widely accepted approach, and continuous research has been ongoing in the last few decades. However, the current solutions to the problem are limited to the use of single trenches, and only limited experimental studies on open and geofoam-infilled have explored the possibilities of utilizing dual trenches. In some practical
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McDowell, Sara. "Geopoliticizing Geographies of Care: Scales of Responsibility Towards Sea-borne Migrants and Refugees in the Mediterranean." In Making and Unmaking Refugees. Routledge, 2023. http://dx.doi.org/10.4324/9781003376217-5.

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Lasa, Rodrigo, Andrea Birke, Larissa Guillén, Martín Aluja, and Daniel Carrillo. "Pests." In Guava: botany, production and uses. CABI, 2021. http://dx.doi.org/10.1079/9781789247022.0013.

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Abstract This chapter focuses on major pests of guava in the different production areas of the world. The most important insects and mites have been grouped into six categories that have been divided according to different species and their importance across the different guava-producing regions. The chapter also emphasizes the basic features of each group related to their feeding damage, biology, behaviour, ecology and biorational pest management strategies. Minor pests are also listed. It is suggested that the main focus of pest control measures should be targeted towards fruit flies, some c
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Manzoni, Marco. "Fast and Robust Estimation of Atmospheric Phase Screens Using C-Band Spaceborne SAR and GNSS Calibration." In Special Topics in Information Technology. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15374-7_11.

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AbstractOver the last few years, a growing interest has been observed in the field of Interferometric Synthetic Aperture Radar (InSAR) meteorology. The atmosphere has always been seen as a disturbance in interpreting interferograms (the output product of InSAR processing). A space-borne radar, however, can sense the refractive index of the medium it travels. The refractive index, in turn, is sensitive to pressure, temperature, and humidity of the air. Therefore, SAR data contains information about the atmosphere’s status and can be exploited by Numerical Weather Prediction Models (NWPM) as add
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Conference papers on the topic "Bortle scale"

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Yépez, Omar, Nihal Obeyesekere, and Jonathan Wylde. "Surface Chemistry of Iron Sulfide Scale and Its Influence on Corrosion Occurring Underneath." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09363.

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Abstract The corrosion protection due to iron sulfide scales has been and continues to be a controversial issue in corrosion science. These scales are very important to understand the mechanism of sour corrosion. For instance, it is known that the point of zero charge (PZC) for mackinawite occurs at pH ~ 7.5. This implies that it is positively charged at pH &amp;lt; 7.5 and negatively charged at pH &amp;gt; 7.5. How this affects corrosion regimes underneath the scale is unknown. This paper describes the formation of a mackinawite scale on carbon steel in a borate buffer pH = 8.4. Then, it was
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Collins, I. R., S. E. Taylor, and P. A. Wheeler. "Development of Emulsion-Based Vehicles for Scale Inhibitor Squeeze Treatments." In CORROSION 2000. NACE International, 2000. https://doi.org/10.5006/c2000-00103.

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Abstract Effective chemical deployment is an important factor in the efficient management of a producing field. Ideally, chemical addition should be as far upstream as possible in order to allow effective control of processes such as scale formation and corrosion. One approach to effecting control early in the production is through so-called squeeze treatments, during which inhibitor chemicals are squeezed under pressure into the near well-bore region of a producing well. Upon lifting the well, the inhibitor will be returned with the produced fluids. Clearly, the effectiveness of oilfield chem
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Matsumoto, Tsuyoshi, Kenichiro Yamauchi, Naoki Yabumi, Tsuyoshi Miyashita, and Hiroyuki Tanabe. "Environmentally Friendly Protective Coating System Using Water-Borne Fluoropolymer TopCoat." In SSPC 2017 Greencoat. SSPC, 2017. https://doi.org/10.5006/s2017-00033.

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In recent years, many tall and large-scale structures have been constructed under harsh environmental conditions. It is required to protect steel structures from a variety of environmental factors over a long period of time. In order to meet such requirements, the increase in durability, extension of lifetime and reduction in life-cycle cost of protective coatings has constantly been the subject of investigations.
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Wolodko, John, Randy Petersen, Rob Cox, and Jack Taylor. "Full-Scale Testing of Grooved Polymer Liners for Downhole Applications." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04358.

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Abstract Corrosion control in downhole casing and tubing is a major concern for operators using carbon dioxide (CO2) in enhanced oil recovery schemes. A potential life-cycle cost advantage can be realized by utilizing polymeric liners in these applications. Conventional liners, however, have been shown to be problematic due to their propensity to collapse when the bore is rapidly de-pressurized. A novel solution to this problem has been the development of a grooved liner system. Grooved liners facilitate the venting of gases which permeate through the liner wall, thereby reducing the chance of
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Olson, J. B., D. C. Moore, and N. Holland-Jones. "A Temperature Activated Extended Lifetime Scale Inhibitor Squeeze System." In CORROSION 1992. NACE International, 1992. https://doi.org/10.5006/c1992-92025.

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Abstract Scale inhibitor squeezes are useful techniques for protecting the near well bore, production tubing and often surface equipment from the damage associated with scale formation. A new scale inhibitor system utilizing a unique placement technique is described. The placement results in lifetimes of one, two or more years dependent primarily on the amount of inhibitor injected. The system relies on a temperature activated process. A polymeric glaze which is in the liquid state is formed and is thus inherently non-damaging to the reservoir permeability. To achieve these results the inhibit
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Ishkov, Oleg, Eric Mackay, and Myles Jordan. "Reservoir Simulation and Near-Well Bore Modelling to Aid Scale Management in a Subsea Gulf of Mexico Field." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05612.

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Abstract This paper presents the findings of a study into the impact of reservoir flow behavior on both the scaling risk at production wells, and the options for managing this scaling risk, for a deepwater sandstone reservoir in the Gulf of Mexico. One significant feature in this field is that flow takes place through isolated formation layers, and choices made regarding the seawater injection wells have a great impact, not only on the BaSO4 scaling tendency, but also on the placement of scale inhibitor squeeze treatments in the producers. In addition to seawater injection, oil production is s
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Bailin, L. J., and V. S. Agarwala. "Microencapsulated DNBM Quaternary Ammonium Corrosion Inhibitors." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90447.

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Abstract The microencapsulation of kilogram quantities of DNBM (dichromate, nitrite, borate, and molybdate) quaternary ammonium corrosion inhibitors for use in anticorrosion primers, paints, and polymers has been performed by spray drying an oil-in-water emulsion of the DNBM in aqueous methylcellulose. An organosilane, methyltrimethoxysilane, was applied to render the shells impermeable to the solvents in the test formulation during cure. The microcapsules produced vere principally in the 5-50 μm particle size range. The capsules contain up to 78% core (payload), and increased levels to 80-90%
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Staruk, William, Sean Patrick Kelley, Jeremy Bain, et al. "Overview of Wind Tunnel Testing of the Joby Aviation eVTOL Isolated Propeller System." In Vertical Flight Society 81st Annual Forum and Technology Display. The Vertical Flight Society, 2025. https://doi.org/10.4050/f-0081-2025-392.

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In 2023, Joby Aviation conducted a test of a prototype propeller for an electric vertical takeoff and landing (eVTOL) tilt-propeller aircraft in the 40- by 80-Foot Wind Tunnel at the National Full-Scale Aerodynamics Complex (NFAC). The propeller differed from rotors found on typical helicopters and tiltrotors in having rigid blades and no cyclic pitch variation, and from airplane propellers in operating in an edgewise flow environment. This wind tunnel test was intended to study the behavior of the propeller in the transition regime experienced during conversion from thrust-borne, through semi
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Sztein, Pablo, Marv Richards, Gregory Hiemenz, and Curt Kothera. "Development of an Active Spinal Support System for Reducing Lumbar Loading from Body Borne Equipment." In Vertical Flight Society 72nd Annual Forum & Technology Display. The Vertical Flight Society, 2016. http://dx.doi.org/10.4050/f-0072-2016-11416.

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The weight of equipment bearing on the upper torso of soldiers and aviators has increased substantially over the past several decades. This increased weight of torso-supported equipment can significantly increase the chances of acute injuries during extreme events (i.e., crashes and hard landings), as well as long-term chronic injuries from normal flight operations. In this study, a novel seat subsystem (the "ActiveSpine") was developed with the goal of off-loading a seated occupant's spine and lower back from occupant-borne equipment while maintaining full mobility. By doing so, the ActiveSpi
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Pavlov, S. A., V. E. Mogilevskii, N. A. Fokin, and V. M. Heifec. "Large Scale Helicopter-borne Gravity." In Saint Petersburg 2008. EAGE Publications BV, 2008. http://dx.doi.org/10.3997/2214-4609.20146879.

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Reports on the topic "Bortle scale"

1

Jones and Hagedorn. PR-266-13206-R01 Role of Fuel Borne Metallic Catalysts in the Inhibition of NOx Formation. Pipeline Research Council International, Inc. (PRCI), 2014. http://dx.doi.org/10.55274/r0010994.

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Fuel borne catalysts (FBC) are additives that are mixed with the fuel prior to it passing into the combustion chamber. Metallic FBC are claimed to substantially reduce NOx in lean burn engines and otherwise improve performance characteristics. The purpose of this project is to research current literature on FBC and evaluate these catalyst materials and their economics to ultimately develop a plan that will lead to laboratory measurements on a full-scale, natural gas fired engine and, potentially, field tests. The first phase of the project, reported herein, consists of four parts: a review of
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Chauhan. L52134 Development of Methods For Assessing Corrosion Metal Loss Defects In Casing Strings. Pipeline Research Council International, Inc. (PRCI), 2003. http://dx.doi.org/10.55274/r0010892.

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An industry survey, dominated by PRCI member companies, was undertaken to gather key information regarding the design, operation and inspection of well bore casing strings. The aim of the survey was to gather information regarding the design standards, fields, gas composition, completion configuration, operational details, inspection methods and type of damage found. Survey results representing 67 storage facilities with a total of 4724 wells were received. This represents approximately 16% of US gas storage facilities. Facilities with initial completion dates between 1920 and 1990 were repres
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Olsen, Daniel, and Azer Yalin. L52360 NOx Reduction Through Improved Precombustion Chamber Design. Pipeline Research Council International, Inc. (PRCI), 2018. http://dx.doi.org/10.55274/r0011536.

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several objectives were Several objectives were completed. First, a literature review was performed to assess the current technological state of prechambers. This includes state of the art design, reliability surveys, and proven prechamber design criteria. This is an enabling tool for developing new prechamber concepts for year 2 of the project. The prioritized concepts are (in order): - Improved prechamber geometry - apply high speed engine prechamber design and scale up for large bore engines. - Adiabatic prechamber - traditional prechamber will ceramic lining to reduce heat transfer to the
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Linker, Taylor, and Timothy Jacobs. PR-457-18204-R01 Variable Fuel Effects on Legacy Compressor Engines Phase IV - Predictive NOx Modeling. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011584.

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The ultimate goal of this work is to improve the current control methods for large bore, lean burn natural gas engines in order to combat performance and emissions issues during variable fuel composition events. This will be achieved in the long term by simulating the effects of variable fuel composition on a large bore, natural gas engine and developing engine control strategies which work to mitigate adverse effects. The work of Phase IV adds onto previous work by enabling the prediction of NOxemissions in the validated, full-scale engine simulation of a Cooper-Bessemer GMWH-10C developed in
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George, Jowers, and Grimley. PR-015-08605-R01 Assessment of Orifice Meter Flow Measurements with Low Differential Pressures - Unblinded. Pipeline Research Council International, Inc. (PRCI), 2009. http://dx.doi.org/10.55274/r0010948.

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Measurement of natural gas flow with an orifice meter is a well-established methodology; however, orifice measurement accuracy is of concern when flow rates are low and the differential pressure (DP) across the orifice is at the extreme low end of common DP transmitter ranges. This research evaluated the performance of multiple types of transmitters in 10-inch and 4-inch orifice meter runs at differential pressures approaching 1 inch of water column (1� H2O), simulating low flow transmission meter stations and depleted production well stations. The results were analyzed to characterize and bet
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George, Jowers, and Grimley. PR-015-08605-R02 Assessment of Orifice Meter Flow Measurements with Low Differential Pressures. Pipeline Research Council International, Inc. (PRCI), 2013. http://dx.doi.org/10.55274/r0010040.

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Measurement of natural gas flow with an orifice meter is a well-established methodology; however, orifice measurement accuracy is of concern when flow rates are low and the differential pressure (DP) across the orifice is at the extreme low end of common DP transmitter ranges. This research evaluated the performance of multiple types of transmitters in 10-inch and 4-inch orifice meter runs at differential pressures approaching 1 inch of water column (1� H2O), simulating low flow transmission meter stations and depleted production well stations. The results were analyzed to characterize and bet
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Conery, Ian, Nicholas Olsen, Shannon Brown, and Katherine Brodie. Quantifying coastal evolution and project performance at beaches by using satellite imagery. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48671.

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Accurately delineating the shoreline is crucial for tracking coastal evolution, community vulnerability, storm impacts, and for coastal management decision-making. However, existing shoreline measurement methods are often time-consuming and expensive and therefore, USACE Districts are often forced to narrow areas of interest or monitoring frequency, decreasing the likelihood of making data-driven management decisions, especially over regional scales. In the last decade, space-borne earth observations have captured images subweekly, and can potentially be used for shoreline monitoring. This wor
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Fieseler, Kelsey, and Timothy Jacobs. PR-457-14201-R04 Variable NG Composition Effects on LB 2SC Integral Engines. Pipeline Research Council International, Inc. (PRCI), 2018. http://dx.doi.org/10.55274/r0011525.

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The overall goal of this project is to improve upon existing engine control strategies of large bore, fuel-lean natural gas engines in order to increase efficiency and maintain emissions compliance during variable fuel composition events. This will be done by simulating the effects of variable fuels in a natural gas engine, and if necessary, develop engine control methods. Phase III builds upon the work of previous phases by implementing detailed cylinder-level geometry, increasing the number of alkane species in the laminar flame speed and ignition delay solutions, and incorporating a precham
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Seiler, Andreas, Aina Winsvold, Mattias Olsson, Svein Morten Eilertsen, and Carolin Berndt. VILTVARNING: Test av nya tekniska åtgärder för att minska antalet viltpåkörningar på järnväg. Swedish University of Agricultural Sciences, 2022. http://dx.doi.org/10.54612/a.7pbjcv25mc.

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Viltolyckorna på järnväg har ökat stadigt de senaste åren – inte bara i Sverige och Norge utan även internationellt. För att minska de ekologiska och socioekonomiska effekterna behövs bättre åtgärder och nya åtgärdsstrategier. Stängsel och faunapassager har vanligtvis god effekt men är dyra lösningar som kan motiveras endast längs särskilt olycksdrabbade sträckor. De behöver därför kompletteras med åtgärder som ger skydd längs huvuddelen av järnvägsnätet. Viltvarslingsprosjektets centrala mål er att bidra till att skapa säkrare väg- och järnvägstransporter i Norden med en infrastruktur som är
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Klement, Eyal, Elizabeth Howerth, William C. Wilson, et al. Exploration of the Epidemiology of a Newly Emerging Cattle-Epizootic Hemorrhagic Disease Virus in Israel. United States Department of Agriculture, 2012. http://dx.doi.org/10.32747/2012.7697118.bard.

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In September 2006 an outbreak of 'Bluetongue like' disease struck the cattle herds in Israel. Over 100 dairy and beef cattle herds were affected. Epizootic hemorrhagic disease virus (EHDV) (an Orbivirusclosely related to bluetongue virus (BTV)), was isolated from samples collected from several herds during the outbreaks. Following are the aims of the study and summary of the results: which up until now were published in 6 articles in peer-reviewed journals. Three more articles are still under preparation: 1. To identify the origin of the virus: The virus identified was fully sequenced and comp
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