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Artykuły w czasopismach na temat "Irregular meter"
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Soldatov, K. I., H. S. Zhelezniak i K. V. Hurzhii. "THE STUDY OF THE DYNAMICS OF IRREGULAR SPAN LENGTHS OF BRIDGE STRUCTURES". Science and Transport Progress, nr 4 (25.08.2004): 221–26. http://dx.doi.org/10.15802/stp2004/20976.
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The article is devoted to the possibility of replacement of complex inseparable irregular bridge structures by their regular counterparts, with minimal errors in definition of the own frequencies. The analysis has been performed on a real five-span bridge structure, designed under a 66 +126 +147 +115 + 76 – meter scheme.
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Latincic, Dragan. "Central rotation of regular (and irregular) musical poligons". Muzikologija, nr 28 (2020): 205–34. http://dx.doi.org/10.2298/muz2028205l.
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The text describes the application of one of the most important isometric transformations to the projected metro-rhythmic entities of individual harmonics of the spectrum. It is a direct isometry called central rotation. Central rotation conditions the hemiola structuring of the meter. Hemiolas are identified with regular and irregular geometric figures (primarily triangles) by means of a partition and the composition (index) number of a particular spectral harmonics. The partition and composition of numbers, which are dealt with in discrete mathematics, on the one hand, and, the technique of horizontal hemiolas, characteristic of the polyphony of the sub-Saharan region, on the other, served as a means of creating methods by which the isometric transformation of central rotation would be realized in (musical) time.
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Mahmood, Farhad. "Mobile radio propagation path loss simulation for two districts of different buildings structures in Mosul-city". Iraqi Journal for Electrical and Electronic Engineering 7, nr 1 (1.06.2011): 78–82. http://dx.doi.org/10.37917/ijeee.7.1.15.
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In this paper two theoretical models have been considered for the prediction of path loss for two different districts in Mosul city, using MATLAB 7.4 program. The Walfisch-Ikegami (W-I) model for uniform heights and similar buildings in the Karama district . The other model is Okumura-Hata (OH) model applied for irregular and dissimilar buildings in the Almajmoa'a district. The information buildings heights are obtained from the civil Eng. Depart. in Mosul university. In this paper it can be shown that The effect of distance in regular area (karama) on path loss is about 10 dB larger than irregular area (Almajmoa'a), and The effect of varying antenna height in regular area (karama) on path loss is about 7 dB greater than irregular area (Almajmoa'a) for 40 meter variation.
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Park, Gyou Tae, Geun Jun Lyu, Young Gyu Kim, Young Dae Kim i Hie Sik Kim. "A Study on the Effective Gas Safety Management Using Smart Appliances". Advanced Engineering Forum 2-3 (grudzień 2011): 649–54. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.649.
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In this paper, we developed and tested the effective gas safety management system by using wireless intelligent gas safety appliances to monitor gas flow and pressure, earthquake in a micom-gas-meter, to check combustible gas leaks and temperature (upper 100°C) in an automatic extinguisher and to measure smoke and CO gas. Then our system takes safety measures such as cutoff, warning and messages to protect a serious risk if results of event are abnormal, communicates with a wall-pad including a gateway with ZigBee network in buildings and to inform the event to user via the safety management program in our server. Also, the inner cutoff valve of intelligent gas meters and automatic extinguishers are operated automatically if irregular events are occurred.
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Ji, Jianghui, Yun Jiang, Yuhui Zhao, Su Wang i Liangliang Yu. "Chang'e-2 spacecraft observations of asteroid 4179 Toutatis". Proceedings of the International Astronomical Union 10, S318 (sierpień 2015): 144–52. http://dx.doi.org/10.1017/s1743921315008674.
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AbstractOn 13 December 2012, Chang'e-2 completed a successful flyby of the near-Earth asteroid 4179 Toutatis at a closest distance of 770 meters from the asteroid's surface. The observations show that Toutatis has an irregular surface and its shape resembles a ginger-root of a smaller lobe (head) and a larger lobe (body). Such bilobate shape is indicative of a contact binary origin for Toutatis. In addition, the high-resolution images better than 3 meters provide a number of new discoveries about this asteroid, such as an 800-meter depression at the end of the large lobe, a sharply perpendicular silhouette near the neck region, boulders, indicating that Toutatis is probably a rubble-pile asteroid. Chang'e-2 observations have significantly revealed new insights into the geological features and the formation and evolution of this asteroid. In final, we brief the future Chinese asteroid mission concept.
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Rashid, Mofeed. "Design and Implementation of Wireless Electric Power Meter Based on XBee Model". Iraqi Journal for Computers and Informatics 41, nr 1 (31.12.2014): 15–19. http://dx.doi.org/10.25195/ijci.v41i1.92.
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Since the 1991 Gulf War, Iraq is still suffering from the crisis and irregular in the processing of electric power to customers.Damage to the network, the old measurement devices for measuring electrical energy consumption, and irregularities and corruption in theprocess of measuring and calculating fees of the consumption, all these reasons led to the deterioration of the performance of thedistribution network in Iraq. In this paper, Wireless Electric Power Meter Based on XBee Module has been designed and implementedwhich ZigBee wireless sensor network (WSN) will be used for wireless electric power meter communication supported by PICmicrocontroller which used for power unit measurements. Wireless metering system will be controlled by central computer which place inbase station; also database will be design to record and manage all data and information of consumers.
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Zikra, Hazanul, i Widyo Pura Buana. "ANALISIS PERBANDINGAN DESAIN SAMPLING SURVEI KERANGKA SAMPEL AREA (KSA)". Seminar Nasional Official Statistics 2020, nr 1 (5.01.2021): 1326–36. http://dx.doi.org/10.34123/semnasoffstat.v2020i1.710.
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Badan Pusat Statistik (BPS) terus melakukan inovasi dalam rangka menghasilkan data pangan yang akurat, termasuk bekerja sama dengan Badan Pengkajian dan Penerapan Teknologi (BPPT) dalam mengembangkan metode survei KSA untuk mengestimasi luas panen padi. Meskipun sudah menerapkan kaidah sampling yang objektif, namun masih perlu dilakukan kajian terutama adanya potensi bias dari estimator survei KSA terutama untuk sawah-sawah dengan karakteristik tidak beraturan, kecil dan menyebar. Salah satu potensi penyebab bias dengan karakteristik sawah tidak beraturan adalah penggunaan segmen berbentuk persegi berukuran 300 meter × 300 meter menimbulkan potensi titik amatan tidak jatuh di sawah. Penelitian ini bertujuan menganalisis perbandingan beberapa alternatif desain sampling KSA, yaitu dot sampling method, two-phase systematic unclustered point sampling, dan irregular segment shape sampling atau kerangka sampel segmen yang mengikuti bentuk sebaran sawah. Metode yang digunakan adalah simulasi sampling dengan opsi desain sampling KSA tersebut dengan berbagai opsi jumlah sampel menggunakan peta populasi sawah di Kecamatan Denpasar Timur pada bulan Februari 2019. Perbandingan hasil simulasi dianalisis dengan pengujian beda rata-rata MSE dan optimasi biaya pada seluruh desain sampling. Kesimpulan dari penelitian ini adalah rancangan sampling menggunakan irregular segment shape dengan 3 (tiga) segmen memberikan tingkat akurasi dan efisien yang lebih baik dibandingkan rancangan sampling dengan kerangka sampel segmen berbentuk persegi.
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Maw, David. ""Trespasser mesure": Meter in Machaut's Polyphonic Songs". Journal of Musicology 21, nr 1 (1.01.2004): 46–126. http://dx.doi.org/10.1525/jm.2004.21.1.46.
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Comments by Jacques de Lige suggest that Ars nova notation operated metrically at more than one rhythmic level. This is borne out by Machaut's compositions, the lais in particular. Inconsistencies within and between the two complete editions of Machaut's works in the reductions of note-values used for transcription indicate that the matter has not been fully resolved; uncertainty concerning metrical level in the polyphonic songs is evident in the different barrings of modus-level rhythmic organization. The system of 12 "modes" (mensural types) in the Compendium de discantu mensurabili by Petrus frater dictus Palma Ociosa reveals that meters centering on both "modus" and "tempus" levels were equally part of polyphonic practice in the mid 1330s. Editors have been wary of recognizing the modus level in Machaut's polyphonic songs because of the frequent irregularities in metrical grouping at this level; yet variation in modus is acknowledged by the Ars nova treatises. A full re-evaluation of the presence of modus in Machaut's songs is warranted. Coordinated analysis of rhythmic "layers" (figural grouping, agogic accent, simultaneous attack, and syllabic rhythm) in two ballades (B35 and B25) justifies the irregular modus recognized by both editions and points to an important distinction between mensuration (pertaining to the notation) and meter (pertaining to the rhythmic organization). Figural disposition, varied recurrence of material, and syllabic rhythm provide other criteria for recognizing variable metrical form. A full-scale analysis on these terms reveals the extent and nature of Machaut's use of modus. His technique of metrical variation conforms to four types (phrasal "distension" and "contraction"; cadential "contraction" and "extension"), and ties in with a 14th-century aesthetic viewpoint that attached great significance to "variety." Machaut himself recognized it as a musical corollary of the amorous condition in lyric song ("trespasser mesure," Motet 7). Reassessment of the modus level has consequences for the editorial approach to notae finales, sectional rests, and also for the choice of tempo in performance.
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Bechtel, Ryan D., Erik Wickley-Olsen, Michel C. Boufadel*, James Weaver i Christopher Barker. "THE MOVEMENT OF OIL AT SEA DUE TO IRREGULAR WAVES". International Oil Spill Conference Proceedings 2008, nr 1 (1.05.2008): 943–47. http://dx.doi.org/10.7901/2169-3358-2008-1-943.
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ABSTRACT Our previous work investigated the transport of oil under regular waves at sea. This work considered irregular waves represented by a JONSWAP spectrum, which is a more realistic situation. Particle tracking was used in a Monte Carlo framework to evaluate the combined effects of wave kinematics and turbulent diffusion on the transport of oil droplets at sea. The centroids, variance and spreading coefficients of oil spills with various wave parameters were found in this study. Turbulent diffusion was assumed to be velocity-dependent, and an empirical formulation adopted from subsurface hydrology was adopted. Five hundred neutrally-buoyant oil “particles” were placed at the water surface and tracked for 1 hour. The vertical movement of the plume appeared to be comparable to the significant wave height (about one meter herein), and to decrease with depth. The increase in wind fetch caused an increase in transport and spreading of the plume. The results found in this study can be used by spill responders as a first approximation to the spread of a dispersed oil spill, or can be used as parameters as part of a more complex code used to model oil spills.
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Sulaiman, Isnada. "KELIMPAHAN BAKTERI PENDEGRADASI MINYAK BUMI DI PT. INDUSTRI KAPAL INDONESIA (Persero) MAKASSAR Makassar". Jurnal Pendidikan Teknologi Pertanian 5 (1.03.2019): 48. http://dx.doi.org/10.26858/jptp.v5i0.8558.
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This research is a descriptive study that aims to determine the abundance of marine bacteria at PT. Indonesian Ship Industry (Persero) in degrading petroleum. Water samples were taken from the territorial waters of PT. Indonesian Ship Industry (Persero) Makassar, with sampling points of 1 to 45.7 meters. Then diluted from 10-1 to 10-4, each dilution (10-1-10-4) was inoculated on a minimal solid medium using the pour cup method, the cup was incubated at 28ºC-30ºC for 48 hours. The data obtained are then analyzed using the Standard Plate Count (SPC) formula and then followed by observations of colonies in the form of colonies, color elevations, and internal structure. The results showed that the difference in bacterial abundance at the sampling point of 1 meter to 45.7 meters was the decrease in bacterial abundance from, taking point 3.6 meters to 45.7 meters while the observation of colonies took the form of edge elevation, color and structure in the colony. The results showed that there were colonies which were round, curly, filamentous, and irregular with convex and convex elevations, jagged edges, wavy, and even with a rough and smooth texture. The inner structure is clear, blurred and slippery and has a yellow and white color.
Rozprawy doktorskie na temat "Irregular meter"
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Alexander, Jan. "Turning the Odds in My Favor : Exploring Non-Isochronous Meters Through Composition and Practice". Thesis, Kungl. Musikhögskolan, Institutionen för jazz, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kmh:diva-4064.
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This thesis discloses my exploration of non-isochronous meters through composition and practice. During my two-year studies at the Royal College of Music in Stockholm, I explored different unevenly divided time signatures by practicing them in various ways, producing transcriptions, compositions and arrangements.The main purpose of this project was to further my knowledge and skills within these time signatures and thereby expand my horizon on perceiving, conceptualizing, composing and playing them. My endeavors culminated in seven original compositions, arranged for a jazz sextet, which I rehearsed and performed with an ensemble. During the process of composing, arranging, practicing and rehearsing, I gained a lot of articulated knowledge as well as embodied knowledge of the idiosyncrasies of various non-isochronous meters and different ways to perceive and play them.
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Bauer, Martin [Verfasser], i Thilo [Akademischer Betreuer] Meyer-Brandis. "Mean-field stochastic differential equations with irregular coefficients : solutions and regularity properties / Martin Bauer ; Betreuer: Thilo Meyer-Brandis". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1215499787/34.
Pełny tekst źródłaKsiążki na temat "Irregular meter"
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Charles, Rodney. Colorfast ~ The Meter is Irregular, Volume 4. 1st World Publishing, 2016.
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Temperley, David. Rhythm and Meter. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190653774.003.0004.
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Simple duple meter is predominant in rock; the metrical structure is usually clearly conveyed by the alternating “kick-snare” pattern in the drums. An important aspect of rock rhythm is anticipatory syncopation, the placement of accented events (such as stressed syllables) on weak beats just before the strong beat on which they are understood to “belong.” Adjacent syncopations at different levels (e.g., eighth-note and sixteenth-note syncopations) can create cross-rhythms. Harmonic rhythm—the rhythm of changes in harmony—is occasionally used in interesting ways in rock. Hypermeter—meter above the level of the measure—is generally regular, but irregularities are not uncommon; sometimes irregular and shifting meter occurs at lower levels as well.
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Temperley, David. Melody. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190653774.003.0005.
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Like melody in general, rock melody is understood to have a hierarchical “grouping structure,” with sub-phrases combining into phrases and then into larger units. A fundamental issue in rock melody is the alignment of melodic groups with meter; while “beginning-accented” groups are the norm, “end-accented” patterns and more irregular patterns also occur. Patterns of repetition—pitch and rhythmic repetition, as well as rhyme—are also important aspects of rock melody. Rock melody sometimes shows independence from the underlying harmony, a phenomenon known as “melodic-harmonic divorce.” Of particular interest is the use of the 3 and flat-3 scale degrees, which are sometimes used in rock melodies in close proximity; related to this is the issue of “blue notes,” notes which fall between the cracks of conventional chromatic-scale categories.
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West, John. Dryden and the Cultivation of the Restoration Pindaric Ode. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198816409.003.0004.
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This chapter traces Dryden’s responses to the development of the Restoration Pindaric ode. In Renaissance Europe, Pindar’s Greek odes were commonly seen as examples of inspired poetry. Abraham Cowley’s vernacular odes echoed and modified this tradition by presenting irregular Pindaric metre and form as a vehicle for paraphrasing biblical scripture. The chapter sees how Dryden thought through this link between inspiration and the Pindaric in odes including ‘To the Memory of Anne Killigrew’ and ‘An Ode for Secelia’s Day’. The heavenly origins of music and its ability to provoke the passions were central to Dryden’s adaptation of the form’s inspired heritage. Such ideas developed politicized associations with military violence after William III came to the throne in 1689. The chapter argues that Dryden’s late ode ‘Alexander’s Feast’ is engaged in a close, critical conversation with Williamite sublime poetics as practised especially by John Dennis.
Części książek na temat "Irregular meter"
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Roeder, John. "Formative Processes of Durational Projection in “Free Rhythm” World Music". W Thought and Play in Musical Rhythm, 55–74. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190841485.003.0003.
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Recent theories of meter have been enriched by consideration of the time cycles and nonisochronous beats found in many musical cultures. However, these theories do not apply to music in which pulse is irregular. In many instances of this sort of “free rhythm” found throughout the world, durations can still be measured, but in relation to immediately preceding durations rather than to a persistent metric grid. Christopher Hasty’s theory of durational projection addresses just this situation. This chapter applies it in analyses of a Persian āvāz, a flute solo from Papua New Guinea, and an ālāp performed by sitarist Budhaditya Mukherjee. The guiding question is not whether there “is” meter or what that meter “is,” but how durational projections guide perception of process, pitch structure, and form, and so can be incorporated into coherent narrative that attributes purpose to the specific free rhythms in extended passages of music.
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Hanenberg, Scott. "Theorizing Complex Meters and Irregular Grooves". W The Cambridge Companion to the Drum Kit, 94–111. Cambridge University Press, 2021. http://dx.doi.org/10.1017/9781108779517.010.
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McMorran, Ciaran. "Squaring the Circle". W Joyce and Geometry, 51–82. University Press of Florida, 2020. http://dx.doi.org/10.5744/florida/9780813066288.003.0003.
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This chapter highlights the practical and metaphysical issues which James Joyce associates with the application of Euclidean geometry as a geo-meter (a measure of the Earth) in “Ithaca.” It demonstrates how the “mathematical catechism” of “Ithaca” geometrizes the visible world, translating natural phenomena into their ideal Euclidean equivalents. In a topographical context, it illustrates how variably curved surfaces undergo a process of rectification as they are mediated by the catechetical narrative, and how this leads to a confusion between maps and their territories. In light of the narrative’s conceptualization of Molly Bloom as both a human and a heavenly body, this chapter also examines the mythical notions which originate from the mathematical catechism’s conflation of geometric objects and the visible world. By evoking an incongruity between visual objects and their meters, it argues, Joyce explores the possible limits of squaring the circle, both topographically (in terms of projecting a curved natural surface onto a two-dimensional map, as in Mercator’s projection) and figuratively (in the sense that the irregularly curved features of the natural world are rectified as they are represented textually on a rectilinear page).
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Cathryn, Costello, i Ioffe Yulia. "Part VI Refugee Rights and Realities, Ch.51 Non-penalization and Non-Criminalization". W The Oxford Handbook of International Refugee Law. Oxford University Press, 2021. http://dx.doi.org/10.1093/law/9780198848639.003.0052.
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This chapter reviews the protections under international law which purport to secure refugees’ right to seek asylum by protecting them from penalization. Once a mere administrative matter, irregular migration and presence are now often made a crime in domestic laws, often with additional criminal offences such as for failure to cooperate in migration and asylum proceedings, or failure to have or produce identity documentation. In addition to criminalization, States also have meted out increasingly harsh treatment to those who breach their migration controls, irrespective of whether they are refugees or not. The chapter then analyses article 31 of the Refugee Convention, the provision which purports to protect refugees from penalization for ‘illegal entry and stay’. It argues that non-penalization reflects one of the objects and purposes of the Refugee Convention. The chapter also explores whether international human rights law substantively limits States’ ‘right’ to criminalize irregular entry and stay, and whether non-penalization of irregular entry or stay may be an emerging general principle of law.
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Johnson, Samuel. "The prince finds a wise and happy man". W The History of Rasselas, Prince of Abissinia, redaktor Thomas Keymer. Oxford University Press, 2009. http://dx.doi.org/10.1093/owc/9780199229970.003.0018.
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As he was one day walking in the street, he saw a spacious building which all were, by the open doors, invited to enter: he followed the stream of people, and found it a hall or school of declamation, in which professors read lectures to their auditory. He fixed his eye upon a sage raised above the rest, who discoursed with great energy on the government of the passions.* His look was venerable, his action graceful, his pronunciation clear, and his diction elegant. He shewed, with great strength of sentiment, and variety of illustration, that human nature is degraded and debased, when the lower faculties predominate over the higher; that when fancy, the parent of passion, usurps the dominion of the mind, nothing ensues but the natural effect of unlawful government, perturbation and confusion; that she betrays the fortresses of the intellect to rebels, and excites her children to sedition against reason their lawful sovereign. He compared reason to the sun, of which the light is constant, uniform, and lasting; and fancy to a meteor, of bright but transitory lustre, irregular in its motion, and delusive in its direction.
Streszczenia konferencji na temat "Irregular meter"
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de Conti, M. "2D Tests with One and Two Cylinders in Waves". W SNAME 23rd American Towing Tank Conference. SNAME, 1992. http://dx.doi.org/10.5957/attc-1992-036.
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A small new facility has been installed in the Department of Naval Architecture of the University of Sao Paulo, Brazil. It is a wave flume, 14 meters long, 1 meter wide and 1 meter deep. Regular and irregular waves, as well as packages of waves, can be generated in the range 0.5 - 2.5 Hz, 0.5 - 5.0 cm. The wave generator is plunger-type, driven by a servo-motor. 2D tests with one and two cylinders have been conducted, varying the immersion and the distance between the cylinders. Forces acting on the cylinders, wave elevation and plunger motion have been measured. The paper describes the facility and presents the results for the stationary cylinders acted transversely by waves.
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Kapsenberg, G. K. "A New Technique for Testing a Sailing Yacht in Waves". W SNAME 10th Chesapeake Sailing Yacht Symposium. SNAME, 1991. http://dx.doi.org/10.5957/csys-1991-004.
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A new experimental technique is presented to test sailing yachts in waves. The method is suitable for the investigation of ship motions in all six degrees of freedom and added resistance for the close hauled condition. Measurements can be made both in regular waves and in irregular seas. The technique has been tried out on a model of a 12-Meter class yacht and showed a resistance increase for the yacht sailing to windward in a wind generated sea of 90% of the calm water resistance.
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Zheng, Yuan, Zong-Yin Zhao, Bo-Qin Fan i Bo Qu. "Technique on Flow Measurement and Its Application in Low Head and Large Discharge Pump Stations". W ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37499.
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The accurate discharge measurement of single pump in low head and large discharge pump stations has been considered as a difficult problem for a long time. Recently, with the completion of some pump stations of South-to-North Water Transfer Project in China, many low head and large discharge pump stations completed with gradually contracted inlet conduit need high accuracy of discharge measurement which is necessary to optimize the operation of pump units, sum up the total discharge and get the efficiency of the pump stations. In this literature, problems came across from traditional measurement methods of discharge are given. These methods are including five-hole probe discharge measurement, discharge measurement using current meter and differential pressure transmitter measurement. Among all these methods, the measurement principle, performance, installation and application of 7510P portable ultrasonic flow-meter with multi-path ultrasonic are specially introduced. Generally speaking, the low head pump stations usually have the characteristic of irregular multi-culvert construction with short straight conduit and gradually contracted cross-sections along the flow direction, so the accurate discharge measurement is very difficult to process. By installing multi paths in conduit, adopting technique on installation elevation of international regulations on Gauss integration method which is also employed in calculating flow, the flow can be got. The number of acoustic paths is determined by conduit construction and hydraulic conditions. The arrangements of acoustic paths are placed in the mode cross-link. Then the discharge can be calculated through integrating the obtained velocity in corresponding cross-section. The installation of 7510P portable ultrasonic flow-meter mainly comprises three processes, including the installation of transducers, the arrangement of cables and its connection with flow-meter. Combining the measured discharge in Jiangdu No.2 Pump Station of the South-to-North Water Transfer Project in China, following conclusions are presented: it has well stability, good repeatability of measurement results, high measurement accuracy with the error around ±0.30%, high reliability and the flow-meter fits a wide range of discharge well. The successful application of 7510P ultrasonic flow-meter accumulates useful experience for discharge measurement of single unit of low head and large discharge pump stations and add a new method of accurate field discharge measurement of low head pump stations, meanwhile, it will play a constructive role in the design, construction and management of pump stations.
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Goodell, Matthew N., Takara E. Truong, Stephanie R. Marston, Brett J. Smiley, Elliot R. Befus, Alex Bingham, Kent Allen i in. "Autonomous Light Assessment Drone for Dark Skies Studies". W ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3205.
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Abstract The improper use of artificial light causing skyglow is detrimental to many types of wildlife and can potentially cause irregular human sleeping patterns. Studies have been performed to analyze light pollution on a global scale. However, light pollution data on a local scale is not of ten available and the effects at local scale have rarely been studied. Herein, a new custom-designed autonomous light assessment drone (ALAD) is described for evaluating light pollution at local scale. The ALAD is designed and equipped with a sky quality meter (SQM) to measure skyglow and a low-cost illuminance sensor to measure light from artificial sources. Outdoor field tests are performed at a remote site in central Utah and the measured results are validated against data from lightpollution-map.info. The SQM measurements are in agreement with the estimates from the light pollution map, and the initial results demonstrate feasibility of the ALAD for local-scale skyglow assessment.
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Prevosto, Marc, i Barbara Bouffandeau. "Probability of Occurrence of a “Giant” Wave Crest". W ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28446.
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On January the 1st 1995, a “giant” wave is observed and measured at the Draupner platform in the North Sea. During a sea state with a significant wave height close to 12 meters, the crest of this isolated wave reached 18.5 meters. The question has been often asked if the physics governing such a wave differ from the physics governing the population of typical waves. Before responding more precisely to this question a first step is to use as accurately as possible, in such extreme situations, the physics governing the typical waves. One of the methodologies to furnish statistics of crest height for individual sea states starting from spectral information is based on Monte Carlo techniques. These techniques ask for the simulation of a very large population to estimate accurately the probability of occurrence of extreme events. As an example, in the sea state conditions of the “Draupner wave”, and using a linear irregular wave model, 40,000,000 simulated waves are necessary to calculate accurately the sea state conditional probability of occurrence of crests higher than 14.6 meters. In this context the more complex reasonably usable model is the irregular second order 3D wave model. In this paper we show how more complicated models (and so more time consuming simulators) can be used without loss in the accuracy of the estimation of the probability of occurrence. In that way, Creamer transform is used which gives the Draupner “giant” crest, 10 times more probable than given by second order models.
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Hafez, K. A., W. Aboul-Fadl i H. W. Leheta. "Comparative Dynamic Response Analysis of a Fixed Offshore Platform Using Deterministic and Spectral Wave Approaches". W ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83845.
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This paper investigates numerically the dynamic response of a fixed offshore platform, namely WHP, in a 2D irregular seaway using both deterministic and spectral design wave approaches. The long-crested irregular seaway is defined by Pierson Moskowitz (PM) spectrum with parameters suiting the WHP installation site. The platform dry weight is 10200 tonnes, sitting on 4 legs wellhead structure, and already installed in Hong Long field of Vietnam coast of South China Sea in a location of 45.47 meters water depth. The platform is supported on piles driven through its legs up to 100 meters protrusion into the seabed. The major construction components of WHP platform are prefabricated piles, jacket, deck, topside, helideck, boat-landing, and a number of J-tubes and risers. A 3D finite element model (FEM) of the platform is created to perform a comparative static and dynamic structural analysis of its response. The numerical results obtained from the deterministic and spectral design wave approaches are compared against each other, and partially validated against the actual platform measurements to introduce a reliable and meaningful interpretation of the numerical results. Finally, for the whole effort to be demonstrated efficiently a few conclusions are introduced and some future recommendations are proposed.
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Peacock, Harold B., Kenneth J. Imrich, Poh-Sang Lam, Douglas R. Leader i Daniel C. Iverson. "Repair of a Melter Pour Spout Using an Expanding Ring". W ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-2055.
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An expanding ring was developed that provided remote repair of the pour spout for a radioactive waste vitrification melter. This passive device used gas pressure to expand a metal ring against the irregularly shaped pour spout wall. Laboratory modeling and testing were performed for proof of concept and optimization before final design and field deployment. The ring expanded radially more than 4.8 mm and successfully repaired the melter pour spout allowing continued glass pouring operation.
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Kushima, Soichiro, Taisei Morishita, Yasuhiko Yamashita, Yuuichirou Okuno i Kazuto Nakahira. "Structural Planning for Tall Damped Building with Irregularly-Shaped Plan and Elevation". W IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/kualalumpur.2018.1005.
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<p>This paper introduces two distinctive means for use of a 189-meter-high damped structure ensuring the safety against earthquake.</p><ol><li> <p>Realization of L-shaped elevational structure planning</p> <p>The bottom and top of the tower have belt trusses and hat trusses respectively to restrain the bending deformation. Furthermore, large-capacity oil dampers (damping force 6,000kN) are installed in the middle part of the tower to restrain the higher-mode deformation.</p></li><li> <p>Realization of L-shaped planar structure planning</p></li></ol><p>We devised the means of matching the centers of gravity and rigidity by adjusting planar rigidity. Moreover, viscous damping devices are located at the edges of the L-shaped plan, where torsional deformation tends to be amplified. We call this system “Damping Tail” system.</p>
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O¨rjasaeter, Oddvin, Per J. Haagensen i Hans Olav Knagenhjelm. "Relative Importance of Defects in Girth Welds of Linepipes". W ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29549.
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The Ormen Lange deepwater gas field is located at water depth down to 1100 meters. The irregular seabed gives severe challenges to pipeline design and verification program was launched to demonstrate adequate fatigue capacity. The research included: modern welding techniques (5G and 2G welding positions), mapping of actual welding defects, misalignment (high/low) and lack of penetration. The thick walled pipe (35mm) showed low or even compressive residual stresses at the inside. This will to some extent be “protective” to the root of the weld. The exceptions to this pattern were the repair welds and the two-sided welds. The small scale test results fell close to the full scale pipe tests when taking into account the geometrical weld distortions, loading mode, and the distribution of weld defects. The importance of the parameters influencing the fatigue capacity could be ranged as follows, most detrimental first: large crack-like defects (LOP, undercut > 1mm), hi/lo, and V-shape (radial shrinkage at the girth weld).
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Harris, Carl. "Use of Side Beaches in the 200 m Towing Tank at the Institute for Marine Dynamics". W SNAME 22nd American Towing Tank Conference. SNAME, 1989. http://dx.doi.org/10.5957/attc-1989-028.
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The Clear Water Towing Tank (CWTT) at the Institute for Marine Dynamics (IMD) measures 200 m long x 12 m wide x 7 m deep with a usable run length of approximately 150 meters. The tank is equipped with an electrically driven (manned) towing carriage capable of speeds up to 10 mis and a hydraulically operated, computer controlled dual-flap wavemaker which can generate regular waves of up to 1.0 min height or irregular waves with significant wave heights of up to 0,3 meters. The tank when built was not equipped with any form of side beaches. Retro-fitting the facility with traditional-style side beaches would be a major expense. Adjustable-height vertical baffles would also, perhaps, be impractical given the limited amount of space between the underside of the towing carriage and the water surface. In an effort to improve the efficiency of use of this facility, it was decided to experiment with low cost flexible side beaches in the CWTT. Beaches of this type are described by Enzinger and Johnson (Reference 1). The authors report a marked decrease in tank settling time and a corresponding increase in the testing efficiency of their tanks. One notable difference in the IMD approach is the use of these 'beaches' on both sides of the tank rather than just one as is the case in the Hydromechanics Laboratory of the U.S. Naval Academy. It was logical to assume that having energy absorbing devices on both walls would decrease the settling time even further for a nominal extra expense. This paper describes the use of the (double) 'course rope' beaches in the CWTT and experiments conducted in calm water and regular waves to determine their effectiveness for this facility.