Journal articles: 'Compact Discs'

1

Stinson, Douglas G. "Compact Discs." Optics and Photonics News 8, no. 11 (November 1, 1997): 36. http://dx.doi.org/10.1364/opn.8.11.000036.

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Heider, Don. "Compact Discs." Journalism & Mass Communication Educator 58, no. 2 (June 2003): 187–90. http://dx.doi.org/10.1177/107769580305800207.

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Gulledge, James L. "COMPACT DISCS REVIEW." Bioacoustics 4, no. 4 (January 1993): 313–15. http://dx.doi.org/10.1080/09524622.1993.10510442.

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Bell, Alan E. "Next-Generation Compact Discs." Scientific American 275, no. 1 (July 1996): 42–46. http://dx.doi.org/10.1038/scientificamerican0796-42.

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Sakmar, Thomas P. "Restoration of compact discs." Nature Genetics 25, no. 3 (July 2000): 245–46. http://dx.doi.org/10.1038/76976.

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Martin, James. "The Unusual Degradation of Recordable Compact Discs." Microscopy Today 8, no. 4 (May 2000): 24–25. http://dx.doi.org/10.1017/s1551929500063410.

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The recordable compact disc (CDR) is a popular and inexpensive medium for storing and disseminating digital information, such as micrographs and scanned images. This technical note describes unusual degradation that rendered a group of discs unreadable. The discs were purchased as a set. Each disc was packaged in a jewel box and wrapped in clear plastic. Several of the discs were used within weeks of purchase to store data, which included digital micrographs.

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Sauer, Matthias. "Compact Discs Featuring Theremin's Instruments." Leonardo Music Journal 6 (1996): 68. http://dx.doi.org/10.2307/1513318.

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Cohen, Norm. "Folk Music on Compact Discs." Journal of American Folklore 102, no. 404 (April 1989): 195. http://dx.doi.org/10.2307/540682.

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Chiang, Lichun, and Ching-Yuan Huang. "Use of Pirated Compact Discs on Four College Campuses: A Perspective from Theory of Planned Behavior." Psychological Reports 101, no. 2 (October 2007): 361–64. http://dx.doi.org/10.2466/pr0.101.2.361-364.

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The Theory of Planned Behavior was chosen as the framework, assuming that college students are rational decision makers seeking to maximize economic gains in purchasing compact discs. A questionnaire was given to 450 students from four college campuses in the Kaohsiung area of Taiwan. Analyses showed that the more positively rated the Behavioral Intention toward purchasing pirated music compact discs, the more likely the college students were to purchase them. Conversely, when Subjective Norms and Perceived Behavioral Control were higher, college students were less likely to make a purchase. Therefore, buying pirated compact discs was consistent with the premises for Attitude, Subjective Norms, and Behavioral Control.

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Pressyanov, D., J. Buysse, A. Van Deynse, A. Poffijn, and G. Meesen. "Indoor radon detected by compact discs." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 457, no. 3 (January 2001): 665–66. http://dx.doi.org/10.1016/s0168-9002(00)00794-4.

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Shibata, Takashi. "Sony's successful strategy for compact discs." Long Range Planning 26, no. 4 (August 1993): 16–21. http://dx.doi.org/10.1016/0024-6301(93)90053-i.

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Monterde, I., and V. Montesinos. "Convex-compact sets and Banach discs." Czechoslovak Mathematical Journal 59, no. 3 (September 2009): 773–80. http://dx.doi.org/10.1007/s10587-009-0046-y.

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La Mantia, Francesco Paolo, Domenico Liarda, Manuela Ceraulo, and Maria Chiara Mistretta. "A Green Approach for Recycling Compact Discs." Polymers 15, no. 3 (January 17, 2023): 491. http://dx.doi.org/10.3390/polym15030491.

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Compact discs (CDs) and digital versatile discs (DVDs) are mainly made by polycarbonate disc, a thin layer of aluminum or silver, a thin layer of a coating and a thin layer of a label of paper or PET. The recycling of these discs is difficult due to the removal of these non-polymeric layers and to our best knowledge, no industrial plants have been resent for their recycling. In this work, we propose a facile way to remove the non-polymeric layers and investigate the effect of the repetitive extrusion process on the processability and on the mechanical properties of the recycled polycarbonate. A few works have been published dealing with both the removal of the non-polymeric layers and the mechanical recycling of the disk of polycarbonate. In our approach, the removal of the non-polymeric layers is easily obtained through a thermo-mechanical treatment in a basic solution by ammonia. This process can be considered green because is made at a low temperature with a small amount of water and a very small amount of ammonia, saving energy and water. The properties of the polycarbonate remain good if the mechanical recycling is made after drying the post-consumer polycarbonate.

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NAKAMURA, GOU. "COMPACT NON-ORIENTABLE SURFACES OF GENUS 5 WITH EXTREMAL METRIC DISCS." Glasgow Mathematical Journal 54, no. 2 (December 12, 2011): 273–81. http://dx.doi.org/10.1017/s0017089511000589.

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AbstractA compact hyperbolic surface of genus g is called an extremal surface if it admits an extremal disc, a disc of the largest radius determined by g. Our problem is to find how many extremal discs are embedded in non-orientable extremal surfaces. It is known that non-orientable extremal surfaces of genus g > 6 contain exactly one extremal disc and that of genus 3 or 4 contain at most two. In the present paper we shall give all the non-orientable extremal surfaces of genus 5, and find the locations of all extremal discs in those surfaces. As a consequence, non-orientable extremal surfaces of genus 5 contain at most two extremal discs.

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Prabuwono, Anton Satria, Siti Rahayu Zulkipli, Doli Anggia Harahap, Wendi Usino, and A. Hasniaty. "Compact Disc Visual Inspection Using Neural Network." Advanced Materials Research 433-440 (January 2012): 727–32. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.727.

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Image processing is widely used in various fields of study including manufacturing as product inspection. In compact disc manufacturing, image processing has been implemented to recognize defect products. In this research, we implemented image processing technique as pre-processing processes. The aim is to acquire simple image to be processed and analyzed. In order to express the object from the image, the features were extracted using Invariant Moment (IM). Afterward, neural network was used to train the input from IM’s results. Thus, decision can be made whether the compact disc is accepted or rejected based on the training. Two experiments have been done in this research to evaluate 40 datasets of good and defective images of compact discs. The result shows that accuracy rate increased and can identify the quality of compact discs based on neural network training.

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Odgaard, P. F., J. Stoustrup, and P. Andersen. "Detection of Surface Defects on Compact Discs." Journal of Control Science and Engineering 2007 (2007): 1–10. http://dx.doi.org/10.1155/2007/36319.

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Online detection of surface defects on optical discs is of high importance for the accommodation schemes handling these defects. These surface defects introduce defect components to the position measurements of focus and radial tracking positions. The respective controllers will accordingly try to suppress these defect components resulting in a wrong positioning of the optical disc drive. In this paper, two novel schemes for detecting these surface defects are introduced and compared. Both methods, which are an extended threshold scheme and a wavelet packet-based scheme, improve the detection compared with a standard threshold scheme. The extended threshold scheme detects the four tested defects with a maximal detection delay of 3 samples while the wavelet packet-based scheme has a maximal detection delay of 6 samples. Simulations of focus and radial positions in the presence of a surface defect are performed in order to inspect the importance and consequences of the size of the detection delay, from which it can be seen that focus and radial position errors increase significantly due to the defect as the detection delay increases.

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Huck, William. "Solti's Ring on Remastered and Compact Discs." Opera Quarterly 4, no. 2 (1986): 145–49. http://dx.doi.org/10.1093/oq/4.2.145.

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Heylen, Richard A. A., and Roger Edward. "Copy protection of digital audio compact discs." Journal of the Acoustical Society of America 117, no. 6 (2005): 3357. http://dx.doi.org/10.1121/1.1948273.

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Briggs, Warren, and James Coleman. "Compact Discs: New tool for competitive analysis." Planning Review 15, no. 6 (June 1987): 32–48. http://dx.doi.org/10.1108/eb054209.

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Girondo, Ernesto, and Gabino González-Diez. "On extremal discs inside compact hyperbolic surfaces." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 329, no. 1 (July 1999): 57–60. http://dx.doi.org/10.1016/s0764-4442(99)80461-3.

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Georgiev, Strahil B., Ivelina S. Dimitrova, Dobromir S. Pressyanov, and Krasimir K. Mitev. "Retrospective Rn-220 Measurements by Compact Discs." IEEE Transactions on Nuclear Science 63, no. 1 (February 2016): 333–40. http://dx.doi.org/10.1109/tns.2015.2506404.

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Kascus, Marie, and Faith Merriman. "CD-ROM: Compact Discs in the Library." Collection Management 10, no. 3-4 (October 27, 1988): 181–89. http://dx.doi.org/10.1300/j105v10n03_15.

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Neufeld, M. Lynne, and Martha Cornog. "Database history: From dinosaurs to compact discs." Journal of the American Society for Information Science 37, no. 4 (July 1986): 183–90. http://dx.doi.org/10.1002/(sici)1097-4571(198607)37:4<183::aid-asi2>3.0.co;2-w.

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Ramadhan, Ali, and Djoko Soemarsono. "PELATIHAN DESAIN KEMASAN JENIS BOKS PRODUK CAKRAM PADAT BAGI LULUSAN SMA DAN SEDERAJAT DI KABUPATEN TANGERANG." MITRA: Jurnal Pemberdayaan Masyarakat 1, no. 1 (May 1, 2017): 1–14. http://dx.doi.org/10.25170/mitra.v1i1.10.

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Packaging is known as product protection and can provide an identity to the product. Box packaging has been known as one of the packaging types that is able to provide security to the product. Currently, compact discs are products that still require packaging that can help in providing an identity. Through training that can provide knowledge and expertise in packaging box design, it is hoped that the community, especially high school graduates and their equivalents, may have new experience and understanding with respect to packaging design process that can be utilized for industrial purposes, especially those related with packaging design. Packaging design for compact discs can help provide an identity which distinguishes one compact disc product from another in the market.

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Gioia, Claudio, Micaela Vannini, Annamaria Celli, Martino Colonna, and Alessandro Minesso. "Chemical recycling of post-consumer compact discs towards novel polymers for powder coating applications." RSC Advances 6, no. 37 (2016): 31462–69. http://dx.doi.org/10.1039/c6ra06147h.

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Colahan, Ellwood. "A Tribute to Vladimir Morkov (The Czar’s Guitars)." Soundboard Scholar 7, no. 1 (2021): 1–9. http://dx.doi.org/10.56902/sbs.2021.7.22.

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Kendall, Kaan, and Kevin Kendall. "Calculations on compact disc cracking." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2203 (June 21, 2021): 20200292. http://dx.doi.org/10.1098/rsta.2020.0292.

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The Griffith equation for brittle cracking has three problems. First, it applies to an infinite sheet whereas a laboratory test sample is typically near 100 × 100 mm. Second, it describes a central crack instead of the more dangerous and easily observable edge crack. Third, the theory assumes a uniform stress field, instead of tensile force application used in the laboratory. The purpose of this paper is to avoid these difficulties by employing Gregory's solution in calculating the crack behaviour of PMMA (Poly Methyl Meth Acrylate) discs, pin loaded in tension. Our calculations showed that axial disc loading gave nominal strengths comparable with Griffith theory, but the force went to zero as the crack fully crossed the disc, fitting experimental results. Off-axis loading was more interesting because the predicted strength was lower than in axial testing, but also gave unexpected behaviour at short crack lengths, where nominal strength did not rise indefinitely but dropped as crack length went below D/10, quite different from Griffith, where strength rose continuously as cracks were shortened. Such off-axis loading leads to a size effect in which larger discs are weaker, reminiscent of the fine fibre strengthening phenomenon reported in Griffith's early paper (Griffith 1921 Phil. Trans. R. Soc. Lond. A 221 , 163–198. ( doi:10.1098/rsta.1921.0006 )). This article is part of a discussion meeting issue ‘A cracking approach to inventing new tough materials: fracture stranger than friction'.

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Tehranchi, Babak, and Dennis G. Howe. "Reliability estimates for data recovered from compact discs." Applied Optics 37, no. 2 (January 10, 1998): 386. http://dx.doi.org/10.1364/ao.37.000386.

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Lasota, Jean-Pierre. "ADAFs, accretion discs and outbursts in compact binaries." New Astronomy Reviews 51, no. 10-12 (May 2008): 752–58. http://dx.doi.org/10.1016/j.newar.2008.03.003.

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Kuzman, Uroš. "On Poletsky theory of discs in compact manifolds." Proceedings of the American Mathematical Society 146, no. 11 (August 8, 2018): 4767–74. http://dx.doi.org/10.1090/proc/14131.

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Zeng, Zhiwei, Ying Chen, and Long Qi. "Soil Cutting by a Compact Disc Harrow Having Various Disc Arrangements." Transactions of the ASABE 62, no. 2 (2019): 429–37. http://dx.doi.org/10.13031/trans.13106.

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Abstract. The compact disc harrow (CDH) is a relatively new type of conservation tillage implement. The disc arrangement on the implement is critical to the tillage performance. The objective of this study was to investigate the effects of disc spacing and offset on the tillage performance of a CDH. Tests were conducted in an indoor soil bin using a CDH with three-disc units. The spacing of the two rear discs in each unit was set at 203, 254, or 305 mm, and the front discs were set at one of three offset positions (left, center, or right) relative to the rear two discs. The discs were operated at two different tillage depths: shallow (63.5 mm) and deep (127 mm). The results showed that the soil cutting area ratio (the ratio of disturbed area to the total area of the furrow) decreased as the spacing increased from 203 to 305 mm. In contrast, the soil cutting efficiency (the volume of soil cut per unit quantity energy used) remained constant in the shallow tillage depth and increased in the deep tillage depth. As for the effect of offset, the center position resulted in a soil cutting area ratio of more than 80%, which was superior to the other two offset positions. However, the right offset had the highest efficiencies of 15.3 and 22 m3 MJ-1 in the shallow and deep tillage depths, respectively. The common standard disc spacing of 254 mm with a center offset was not necessarily the optimal setting, depending on the working depth and tillage performance indicators of interest. Keywords: Disc, Offset, Performance, Soil Cutting, Spacing, Tillage.

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Salmon, J., and R. M. Canup. "Accretion of the Moon from non-canonical discs." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2024 (September 13, 2014): 20130256. http://dx.doi.org/10.1098/rsta.2013.0256.

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Impacts that leave the Earth–Moon system with a large excess in angular momentum have recently been advocated as a means of generating a protolunar disc with a composition that is nearly identical to that of the Earth's mantle. We here investigate the accretion of the Moon from discs generated by such ‘non-canonical’ impacts, which are typically more compact than discs produced by canonical impacts and have a higher fraction of their mass initially located inside the Roche limit. Our model predicts a similar overall accretional history for both canonical and non-canonical discs, with the Moon forming in three consecutive steps over hundreds of years. However, we find that, to yield a lunar-mass Moon, the more compact non-canonical discs must initially be more massive than implied by prior estimates, and only a few of the discs produced by impact simulations to date appear to meet this condition. Non-canonical impacts require that capture of the Moon into the evection resonance with the Sun reduced the Earth–Moon angular momentum by a factor of 2 or more. We find that the Moon's semi-major axis at the end of its accretion is approximately 7 R ⊕ , which is comparable to the location of the evection resonance for a post-impact Earth with a 2.5 h rotation period in the absence of a disc. Thus, the dynamics of the Moon's assembly may directly affect its ability to be captured into the resonance.

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Bruder, Friedrich-Karl, Konstantinos Douzinas, Uli Franz, Wilfried Haese, and Rafael Oser. "Materials for Optical Disc Substrates." MRS Bulletin 31, no. 4 (April 2006): 299–307. http://dx.doi.org/10.1557/mrs2006.68.

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AbstractOptical data storage has become the mainstream technology during the past two decades for distributing audio, video, and software content as well as for recording and archiving personal data. The continuous demand for ever-higher storage capacities and faster data transfer has led to the development of three disc format families using infrared (compact discs), red (digital versatile discs), and blue lasers (Blu-ray discs or high-density DVDs). Substrate materials used in optical discs need to possess a complex property profile with sufficient optical, rheological, mechanical, and processing characteristics to ensure cost-efficient replication, good read/write performance, and long-term media stability. Bisphenol-A polycarbonate (BPA-PC) is the substrate material of choice and has undergone several optimization cycles to always meet new format specifications.

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Saliba-Silva, Adonis M., R. H. L. Garcia, I. C. Martins, E. F. Urano de Carvalho, and M. Durazzo. "Nickel Electrodeposition over Powder Compact for Irradiation Target." Materials Science Forum 727-728 (August 2012): 14–19. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.14.

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rradiation targets with 20% of 235U (Low Enriched Uranium - LEU) have been studied to replace HEU (Highly Enriched Uranium) targets in future nuclear reactors. These are used to produce the pair of radionuclides 99Mo / 99mTc, used for diagnostics in nuclear medicine. This work aims to develop an alternative route to produce LEU targets. It consists in hydrogenating and powdering metallic uranium and compacting the produced powder, followed by sealing it with nickel by electrodeposition. The deposited nickel should suppress the release of fission gases, and avoid a reactive contact of uranium with aluminum from the enclosure. In order to obtain the best conditions for deposition over uranium, in this work iron powder was compacted into small discs, with a diameter of 22mm and weight of 14g, simulating an equivalent volume of 10g of LEU uranium powder. As well, aluminum discs were used to ensure adhesion and uniformity of the nickel layer. Pulsed nickel electrodeposition was carried out over the compacts, employing current frequency of 900Hz, -0.84A/cm2 of peak current and duty cycle of 0.5 in Watts Bath. The electrical resistance of pulse Ni-plated layer was checked by experiments with impedance spectroscopy in plated samples using aluminum substrate, held in KCl (pH=6), giving EIS results after resting the discs in solution for 0h, 4h and 24h. The physical strength was evaluated qualitatively by treating the Ni covered compact at 600°C, developing a bump deformation on the original planar layer, up to the point to open the Ni-layer for gas relief. These results suggest an adequate mechanical strength of the Ni-layer for using under neutronic irradiation, sealing the radioactive gases, mainly 140Xe, produced during fission of 235U.

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Corporaal, Akke, Jacques Kluska, and Hans Van Winckel. "Circumbinary discs around post-AGB binaries as a result of binary interactions: an infrared interferometric view." Proceedings of the International Astronomical Union 16, S366 (November 2020): 277–80. http://dx.doi.org/10.1017/s1743921322000175.

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AbstractPost-Asymptotic Giant Branch (post-AGB) binary systems are binary interaction products. These stars have recently undergone a strong, but not well understood, binary interaction phase, leading to the formation of stable, compact circumbinary discs. These circumbinary discs are found to show many similar properties to protoplanetary discs around young stars. Here, we focus on one such system, namely IRAS 08544-4431 and resolve the inner regions of the complex circumstellar environment using multi-wavelength infrared interferometric techniques. The visibility data of PIONIER (H-band), GRAVITY (K-band), and MATISSE (L and N band) are analysed together using two families of geometric models, giving a good fit to all data.

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Maud, L. T., R. Cesaroni, M. S. N. Kumar, F. F. S. van der Tak, V. Allen, M. G. Hoare, P. D. Klaassen, et al. "Chasing discs around O-type (proto)stars." Astronomy & Astrophysics 620 (November 23, 2018): A31. http://dx.doi.org/10.1051/0004-6361/201833908.

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We present high angular resolution (~0.2″) continuum and molecular emission line Atacama Large Millimeter/sub-millimeter Array (ALMA) observations of G17.64+0.16 in Band 6 (220−230 GHz) taken as part of a campaign in search of circumstellar discs around (proto)-O-stars. At a resolution of ~400 au the main continuum core is essentially unresolved and isolated from other strong and compact emission peaks. We detect SiO (5–4) emission that is marginally resolved and elongated in a direction perpendicular to the large-scale outflow seen in the 13 CO (2−1) line using the main ALMA array in conjunction with the Atacama Compact Array (ACA). Morphologically, the SiO appearsto represent a disc-like structure. Using parametric models we show that the position-velocity profile of the SiO is consistent with the Keplerian rotation of a disc around an object between 10 and 30 M⊙ in mass, only if there is also radial expansion from a separate structure. The radial motion component can be interpreted as a disc wind from the disc surface. Models with a central stellar object mass between 20 and 30 M⊙ are the most consistent with the stellar luminosity (1 × 105 L⊙) and indicative of an O-type star. The H30α millimetre recombination line (231.9 GHz) is also detected, but spatially unresolved, and is indicative of a very compact, hot, ionised region co-spatial with the dust continuum core. The broad line-width of the H30α emission (full-width-half-maximum = 81.9 km s−1) is not dominated by pressure-broadening but is consistent with underlying bulk motions. These velocities match those required for shocks to release silicon from dust grains into the gas phase. CH3 CN and CH3 OH thermal emission also shows two arc shaped plumes that curve away from the disc plane. Their coincidence with OH maser emission suggests that they could trace the inner working surfaces of a wide-angle wind driven by G17.64 which impacts the diffuse remnant natal cloud before being redirected into the large-scale outflow direction. Accounting for all observables, we suggest that G17.64 is consistent with a O-type young stellar object in the final stages of protostellar assembly, driving a wind, but that has not yet developed into a compact H II region. The existance and detection of the disc in G17.64 is likely related to its isolated and possibly more evolved nature, traits which may underpin discs in similar sources.

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Lynch, Mark. "Classroom note: Compact, convex, and symmetric sets are discs." International Journal of Mathematical Education in Science and Technology 35, no. 2 (March 2004): 268–69. http://dx.doi.org/10.1080/00207390310001638287.

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Markle, Susan M. "Who needs hypertext, compact discs, or Digital Video Interactive?" British Journal of Educational Technology 20, no. 3 (September 1989): 218–19. http://dx.doi.org/10.1111/j.1467-8535.1989.tb00739.x.

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Carstens, Timothy V., and Elizabeth M. Vihnanek. "Classification of a Small Collection of Music Compact Discs." Technical Services Quarterly 18, no. 1 (December 23, 2000): 25–32. http://dx.doi.org/10.1300/j124v18n01_03.

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Macrae, Craig. "A Guide to Central Asian Music on Compact Discs." Middle East Studies Association Bulletin 32, no. 2 (1998): 165–68. http://dx.doi.org/10.1017/s0026318400037226.

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The Dissolution of the Soviet Union has inspired a growing awareness of the dynamic cultures of Central Asia accompanied by an expanding catalogue of resources for use in teaching and research. Among these resources are an abundance of excellent recordings of Central Asian music available on compact disc. This review serves as an introductory guide to recordings of Central Asian music that will enrich personal collections, serve as excellent teaching materials, and enhance possibilities for research. The CDs recommended here are anthologies that have been chosen for the artistic quality of the recorded performances, broad and representative coverage of relevant musical genres, and above all for the reliable commentary that accompanies these productions.

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Guo, Chang-Yu, and Stefan Wenger. "Area minimizing discs in locally non-compact metric spaces." Communications in Analysis and Geometry 28, no. 1 (2020): 89–112. http://dx.doi.org/10.4310/cag.2020.v28.n1.a3.

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Das, Tapas K., and Sandip K. Chakrabarti. "Mass outflow rate from accretion discs around compact objects." Classical and Quantum Gravity 16, no. 12 (November 1, 1999): 3879–901. http://dx.doi.org/10.1088/0264-9381/16/12/308.

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Tamarit-López, Jesús, Sergi Morais, Rosa Puchades, and Ángel Maquieira. "Use of polystyrene spin-coated compact discs for microimmunoassaying." Analytica Chimica Acta 609, no. 1 (February 2008): 120–30. http://dx.doi.org/10.1016/j.aca.2007.12.028.

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Gupta, Purvi. "A Real-analytic Nonpolynomially Convex Isotropic Torus with no Attached Discs." Canadian Mathematical Bulletin 61, no. 2 (June 1, 2018): 289–91. http://dx.doi.org/10.4153/cmb-2017-031-2.

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AbstractWe showbymeans of an example in that Gromov’s theoremon the presence of attached holomorphic discs for compact Lagrangianmanifolds is not true in the subcritical real-analytic case, even in the absence of an obvious obstruction, i.e., polynomial convexity.

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SUKHOV, ALEXANDRE. "PLURIPOLAR SETS, REAL SUBMANIFOLDS AND PSEUDOHOLOMORPHIC DISCS." Journal of the Australian Mathematical Society 109, no. 2 (April 8, 2019): 270–88. http://dx.doi.org/10.1017/s1446788719000119.

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We prove that a compact subset of full measure on a generic submanifold of an almost complex manifold is not a pluripolar set. Several related results on boundary behavior of plurisubharmonic functions are established. Our approach is based on gluing a family of complex discs to a generic manifold along a boundary arc and could admit further applications.

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Coufal, Hans, and Lisa Dhar. "Materials for Optical Data Storage." MRS Bulletin 31, no. 4 (April 2006): 294–98. http://dx.doi.org/10.1557/mrs2006.67.

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AbstractThe development of recording materials has been a critical component in the advancement of optical data storage. The continual need for improved performance in both consumer and business applications has pushed forward the capabilities of optical storage. In this issue of MRS Bulletin, we review some of the important developments in the materials behind established technologies such as compact discs, digital versatile discs, and magneto-optical recording; the emerging technology of blue recording; and two technologies that seek to extend the performance roadmap for optical storage, multilayer and holographic recording.

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Dittmann, Alexander J., and M. Coleman Miller. "Star formation in accretion discs and SMBH growth." Monthly Notices of the Royal Astronomical Society 493, no. 3 (February 17, 2020): 3732–43. http://dx.doi.org/10.1093/mnras/staa463.

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ABSTRACT Accretion discs around active galactic nuclei (AGNs) are potentially unstable to star formation at large radii. We note that when the compact objects formed from some of these stars spiral into the central supermassive black hole (SMBH), there is no radiative feedback and therefore the accretion rate is not limited by radiation forces. Using a set of accretion disc models, we calculate the accretion rate on to the central SMBH in both gas and compact objects. We find that the time-scale for an SMBH to double in mass can decrease by factors ranging from ∼0.7 to as low as ∼0.1 in extreme cases, compared to gas accretion alone. Our results suggest that the formation of extremely massive black holes at high redshift may occur without prolonged super-Eddington gas accretion or very massive seed black holes. We comment on potential observational signatures as well as implications for other observations of AGNs.

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Iraci, Joe. "Blu-Ray Media Stability and Suitability for Long-Term Storage." Restaurator. International Journal for the Preservation of Library and Archival Material 39, no. 2 (July 26, 2018): 129–55. http://dx.doi.org/10.1515/res-2017-0016.

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Abstract The most recent generation of optical disc media available is the Blu-ray format. Blu-rays offer significantly more storage capacity than compact discs (CDs) and digital versatile discs (DVDs) and thus are an attractive option for the storage of large image or audio and video files. However, uncertainty exists on the stability and longevity of Blu-ray discs and the literature does not contain much information on these topics. In this study, the stabilities of Blu-ray formats such as read-only movie discs as well as many different brands of recordable and erasable media were evaluated. Testing involved the exposure of samples to conditions of 80 °C and 85 % relative humidity for intervals up to 84 days. Overall, the stability of the Blu-ray formats was poor with many discs significantly degraded after only 21 days of accelerated ageing. In addition to large increases in error rates, many discs showed easily identifiable visible degradation in several different forms. In a comparison with other optical disc formats examined previously, Blu-ray stability ranked very low. Other data from the study indicated that recording Blu-ray media with low initial error rates is challenging for some brands at this time, which is a factor that ultimately affects longevity.

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Zanella, A., E. Le Floc’h, C. M. Harrison, E. Daddi, E. Bernhard, R. Gobat, V. Strazzullo, et al. "A contribution of star-forming clumps and accreting satellites to the mass assembly of z ∼ 2 galaxies." Monthly Notices of the Royal Astronomical Society 489, no. 2 (August 5, 2019): 2792–818. http://dx.doi.org/10.1093/mnras/stz2099.

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ABSTRACT We investigate the contribution of clumps and satellites to the galaxy mass assembly. We analysed spatially resolved HubbleSpace Telescope observations (imaging and slitless spectroscopy) of 53 star-forming galaxies at z ∼ 1–3. We created continuum and emission line maps and pinpointed residual ‘blobs’ detected after subtracting the galaxy disc. Those were separated into compact (unresolved) and extended (resolved) components. Extended components have sizes ∼2 kpc and comparable stellar mass and age as the galaxy discs, whereas the compact components are 1.5 dex less massive and 0.4 dex younger than the discs. Furthermore, the extended blobs are typically found at larger distances from the galaxy barycentre than the compact ones. Prompted by these observations and by the comparison with simulations, we suggest that compact blobs are in situ formed clumps, whereas the extended ones are accreting satellites. Clumps and satellites enclose, respectively, ∼20 per cent and ≲80 per cent of the galaxy stellar mass, ∼30 per cent and ∼20 per cent of its star formation rate. Considering the compact blobs, we statistically estimated that massive clumps (M⋆ ≳ 109 M⊙) have lifetimes of ∼650 Myr, and the less massive ones (108 < M⋆ < 109 M⊙) of ∼145 Myr. This supports simulations predicting long-lived clumps (lifetime ≳ 100 Myr). Finally, ≲30 per cent (13 per cent) of our sample galaxies are undergoing single (multiple) merger(s), they have a projected separation ≲10 kpc, and the typical mass ratio of our satellites is 1:5 (but ranges between 1:10 and 1:1), in agreement with literature results for close pair galaxies.

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Schneider, Edward. "The Magic of Optical Memories." CALICO Journal 4, no. 4 (January 14, 2013): 83–89. http://dx.doi.org/10.1558/cj.v4i4.83-89.

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Optical memory in the form of compact discs is ever increasing inpopularity throughout the world. Two variations are Compact Disc Read-Only Memory (CD ROM) and Compact Disc-Interactive (CD-I). CD ROM is well-suited to information storage in the form of text. CD-I is not in the production yet but will be capable of text, graphics, video still frames, and audio at three different quality levels. Education is not the target market for CD ROM or CD-I. Nevertheless, both CD ROM and CD-I can be a great boon to language education and will find their place in the education market.

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Journal articles on the topic 'Compact Discs'

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