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Academic literature on the topic 'Cores for flakes'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "Cores for flakes"

1

Prasciunas, Mary M. "Bifacial Cores and Flake Production Efficiency: An Experimental Test of Technological Assumptions." American Antiquity 72, no. 2 (2007): 334–48. http://dx.doi.org/10.2307/40035817.

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Many researchers assume that the greater flake tool production efficiency of bifacial versus amorphous cores helps explain the prevalence of bifacial core technology among mobile populations. This paper describes experiments that test whether bifacial cores are more efficient carriers of flake cutting edge than amorphous cores. The first experiment established a size threshold of flake cutting efficiency. The second experiment reduced ten bifacial and ten amorphous cores to exhaustion and calculated the amount of usable and total flake edge produced by each core type, excluding flakes beneath

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Pavlenok, Galina D., Maxim B. Kozlikin, and Michael V. Shunkov. "SMALL BLADE TECHNOLOGY IN THE EARLY UPPER PALEOLITHIC INDUSTRIES FROM DENISOVA CAVE: DATA FROM ANALYSIS OF A LITHIC REDUCTION SEQUENCE." Ural Historical Journal 70, no. 1 (2021): 123–28. http://dx.doi.org/10.30759/1728-9718-2021-1(70)-123-128.

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The paper discusses the results from an analysis of five cores associated with Layer 11 in the Southern Chamber of Denisova Cave, intended to obtain small elongated blanks such as bladelets and small blades. Analysis of a lithic reduction sequence employed in the research has made it possible to clearly recognize the phases in producing flake scars on lithic artifacts through the preparation of core blanks, and in core reduction, as well as to determine stages at which some of these pieces were used as tools. The analysis provided insights into a general flaking pattern for the cores under stu

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Kandyba, A. V., Khac Su Nguyen, A. M. Chekha, and Gia Doi Nguyen. "Paleolithic Nguom Culture of Northern Vietnam." Vestnik NSU. Series: History and Philology 23, no. 3 (2024): 62–73. http://dx.doi.org/10.25205/1818-7919-2024-23-3-62-73.

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Purpose. In North Vietnam, the Nguomian culture has been distinguished, which is characterized by the predominance of flake tools in the techno-typological complex. This industry dates back to the second half of the Upper Pleistocene, preceding the previously identified Sonvian and Hoabinhian. The purpose of this study is to determine the technical and typological characteristics of one of the key monuments of the Nguom industry – the Nguom Rockshelter. For this purpose, a technical and typological analysis of the collection of stone products obtained as a result of excavations in 1981–1982 wa

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Kamp, Kathryn A., and John C. Whittaker. "Unproductive Lithic Resources at Lake Mead." American Antiquity 51, no. 2 (1986): 383–88. http://dx.doi.org/10.2307/279952.

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Artifacts from 24 chipping stations and a lithic scatter from the Lake Mead National Recreation Area, Nevada were analyzed by refitting conjoinable flakes to original cores. Artifacts represented debitage from the initial reduction of locally-available low-quality chalcedony nodules for the eventual production of flake tools. The refitting analysis allowed the debitage to be divided into four patterns that roughly correlate with variation in the quality of the raw material. All result from the same strategy of reduction aimed at producing as many usable flakes as possible from low-quality mate

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Zakharikov, A. P. "Quartzite debitage from the lower layers of Nepryakhino site." Universum Humanitarium, no. 2 (July 5, 2022): 85–128. http://dx.doi.org/10.25205/2499-9997-2021-2-85-128.

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The article is devoted to the analysis of quartzite debitage from the lower layers of the Nepryakhino site. The multi-layered Nepryakhino site in the Volga-Ural interfluves is located. The lower layers are dated to OIS3. AMS date for the lower buried soil – 40,620 ± 270 BP. The assemblages from lower layers of Nepryakhino site is characterized by significant amount of bifaces (from 16 to 31 %); prismatic cores accompanied by a representative group of prismatic preforms. The debitage is 97 %. Spalls associated with the preparation, knapping, and trimming of prismatic cores amount to 4 %. The bi

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Zolotarev, Dmitriy P., Ivan S. Shegutov, and Natalia E. Berdnikova. "Maltinka 1 - a Little-Known Late Paleolithic Site Near the Malta (South of Baikal-Yenisei Siberia)." Herald of Omsk University. Series: Historical studies 10, no. 4 (40) (2023): 157–67. http://dx.doi.org/10.24147/2312-1300.2023.10(4).157-167.

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The article describes the study results of the little-known Upper Paleolithic site Maltinka 1, located on the Belaya River (left tributary of the Angara River) in the vicinity of the world-famous Malta Paleolithic site. It was discovered in 1929 by Mikhail Gerasimov and studied in 1977, 1983 by Irina Lezhnenko. In the deposits of MIS 2 and MIS 1, 4 cultural layers (c.l.) were identified. Their estimated age is as follows: c.l. 1 - 7-1 ka cal BP; c.l. 2 - ~14.7-12.8 ka cal BP; c.l. 3 - ~18.6-17.6 ka cal BP; c.l. 4 - ~27-25 ka cal BP. Layers 1 and 4 are not very informative. The finds of layer 2

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Li, Hao, Kathleen Kuman, Matt G. Lotter, George M. Leader, and Ryan J. Gibbon. "The Victoria West: earliest prepared core technology in the Acheulean at Canteen Kopje and implications for the cognitive evolution of early hominids." Royal Society Open Science 4, no. 6 (2017): 170288. http://dx.doi.org/10.1098/rsos.170288.

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Prepared core technology illustrates in-depth planning and the presence of a mental template during the core reduction process. This technology is, therefore, a significant indicator in studying the evolution of abstract thought and the cognitive abilities of hominids. Here, we report on Victoria West cores excavated from the Canteen Kopje site in central South Africa, with a preliminary age estimate of approximately 1 Ma (million years ago) for these cores. Technological analysis shows that the Victoria West cores bear similarities to the ‘Volumetric Concept’ as defined for the Levallois, a p

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Patterson, Leland W. "Amorphous Cores and Utilized Flakes: A Commentary." Lithic Technology 16, no. 2-3 (1987): 51–53. http://dx.doi.org/10.1080/01977261.1987.11720883.

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Hayden, Brian. "Insights into early lithic technologies from ethnography." Philosophical Transactions of the Royal Society B: Biological Sciences 370, no. 1682 (2015): 20140356. http://dx.doi.org/10.1098/rstb.2014.0356.

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Oldowan lithic assemblages are often portrayed as a product of the need to obtain sharp flakes for cutting into animal carcases. However, ethnographic and experimental research indicates that the optimal way to produce flakes for such butchering purposes is via bipolar reduction of small cryptocrystalline pebbles rather than from larger crystalline cores resembling choppers. Ethnographic observations of stone tool-using hunter-gatherers in environments comparable with early hominins indicate that most stone tools (particularly chopper forms and flake tools) were used for making simple shaft to

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Belousova, N. E., M. V. Seletskiy, and A. Yu Fedorchenko. "Tools for Stone Raw Material Treatment in the Initial and Early Upper Palaeolithic Industries of the Ust-Karakol-1 Site (Excavation Area, 1986)." Vestnik NSU. Series: History and Philology 22, no. 3 (2023): 36–48. http://dx.doi.org/10.25205/1818-7919-2023-22-3-36-48.

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Purpose. This article studies tools for stone raw material treatment found in the Ust-Karakol-1 site collection in Altai (excavation area, 1986).Results. We have established that the latest industry of this site, tentatively correlated with the Middle stage of the Upper Palaeolithic, includes one hammer made of the endcore of fine-grained sedimentary rock. We have identified a pebble hammer flake and retouchers made of coarse-grained sedimentary rocks in the Ust-Karakolian horizon of the Early Upper Palaeolithic. The site inhabitants used flattened and end natural surfaces of pebbles’ fragment

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Dissertations / Theses on the topic "Cores for flakes"

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Mohamed, Jainulabdeen Mohammed Abdul Kadher. "Combustion Noise and Instabilities from Confined Non-premixed Swirl Flames." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1560867354695989.

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Cònsul, Serracanta Ricard. "Development of numerical codes for the evaluation of combustion processes. Detailed numerical simulations of laminar flames." Doctoral thesis, Universitat Politècnica de Catalunya, 2002. http://hdl.handle.net/10803/6679.

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Deep knowledge of combustion phenomenon is of great scientific and technological interest due to its presence in a wide range of industrial processes and equipment. Being the most important worldwide energy support provided by combustion of fossil fuels, the goal of developing more efficient and cleaner systems or equipment is clearly justified. In the last decade, the importance of the reduction of pollutant emissions has increased considerably due to both environmental consciousness and to governmental policies, being one of the most important aspects to assure the competitiveness of combust

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Bonhomme, Adrien. "Numerical study of laminar and turbulent flames propagating in a fan-stirred vessel." Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/12019/1/Bonhomme_adrien.pdf.

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Fossil energy is widely used since the 1900s to satisfy the global increasing energy demand. However, combustion is a process releasing pollutants such as CO2 and NOx. One of the major challenges of the 21th century is to reduce these emissions and car manufacturers are involved in this race. To increase fuel efficiency of piston engines, some technical solutions are developed such as ‘downsizing’. It consists in reducing the engine size while maintaining its performances using a turbocharger to increase the trapped mass in the combustion chamber. Unfortunately, downsizing can lead to abnormal

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Moody, Leslie Shane. "Towards the Design and Syntheses of Novel Triads Comprising Single Robson-Type Macrocyclic Dicopper(II) Cores Flanked by Two Terminal Polypyridyl Ruthenium(II) Complexes." Digital Commons @ East Tennessee State University, 2008. https://dc.etsu.edu/etd/2010.

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Progress toward the syntheses of new tetranuclear bimetallic complexes of copper(II) and ruthenium(II) was realized. The designed triads comprise a central binuclear copper(II) complex with a tetraiminodiphenolate macrocyclic Robson-type compartmental ligand. In the envisioned complexes, the macrocyclic core is further functionalized by attachment of two polypyridyl ruthenium(II) complexes. A novel dibrominated dicopper(II) Robson complex was formed by the 2:2:2 condensation reaction of 4-bromo-2,6-diformylphenol and 1,3- diaminopropane with cupric chloride. Similarly, a new dibrominated dizin

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YAMAMOTO, Kazuhiro, Masahisa SHINODA, Hiroshi YAMASHITA та ін. "ランキン渦流中での予混合火炎伝播に与える渦核半径の影響に関する数値解析". 一般社団法人日本機械学会, 2008. http://hdl.handle.net/2237/19800.

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Younger, Alexandra Carla. "Lithic Production at the Mesilla Phase Placitas Arroyo Site Complex Doña Ana County, New Mexico." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1538785/.

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This study of lithic analysis shifts attention from typological studies to explicitly behavioral analyses, complimenting studies of both intrasite and intersite patterns of variability and change. Analysis of several assemblages from the Placitas Arroyo site complex reveals changing patterns of raw material procurement and selection, core reduction strategies, as well as tool production and discard. The most striking result thus far is the quite uniform emphasis on flake production from well-prepared cores, and the near absence of manufacture or maintenance of bifacial tools, especially projec

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Ayache, Simon Victor. "Simulations of turbulent swirl combustors." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/243609.

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This thesis aims at improving our knowledge on swirl combustors. The work presented here is based on Large Eddy Simulations (LES) coupled to an advanced combustion model: the Conditional Moment Closure (CMC). Numerical predictions have been systematically compared and validated with detailed experimental datasets. In order to analyze further the physics underlying the large numerical datasets, Proper Orthogonal Decomposition (POD) has also been used throughout the thesis. Various aspects of the aerodynamics of swirling flames are investigated, such as precession or vortex formation caused by f

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Neveu, Fabrice. "Mesures simultanées de la température et de la vitesse dans une flamme turbulente non prémélangée méthane-air, stabilisée par un bruleur de type Bluff-Body." Rouen, 1994. http://www.theses.fr/1994ROUES079.

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Des données expérimentales sur les grosses structures ainsi que les corrélations entre certaines grandeurs physiques, telles que la vitesse et la température, sont nécessaires à la compréhension de la flamme turbulente. Pour obtenir de tels renseignements, on utilise l'association de deux techniques qui sont l'anémométrie Doppler laser pour les mesures de vitesse et le thermocouple à fil fin compensé numériquement pour la température. De par leur façon d'acquérir les données, aléatoire pour l'une, à fréquence fixe pour l'autre, ces deux méthodes obligent un traitement spécifique des mesures lo

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Baqué, Bénédicte. "Couplage aéro-thermo-mécanique pour la prédiction de la déformation d'une plaque soumise à une flamme." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00718738.

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Cette thèse consiste à mettre en place un couplage externe aéro-thermo-mécanique, sur la base d'un schéma partitionné, entre les codes de recherche CEDRE (mécanique des fluides, volumes finis) et Z-set (modules indépendants pour la mécanique des structures et la thermique du solide, éléments finis). Les résultats numériques sont confrontés à ceux de l'expérience (une campagne de mesures a été menée dans le cadre de cette étude), dans le cas d'un problème complexe lié au domaine de l'aérospatial : l'interaction flamme-paroi. Ce phénomène est piloté par la thermique, à travers le flux de chaleur

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Nguyêñ, Huũ Tuyên. "Etude expérimentale de l'influence de la géométrie de stabilisateur sur le développement d'une flamme non prémélangée." Ecully, Ecole centrale de Lyon, 1999. http://bibli.ec-lyon.fr/exl-doc/TH_T1788_htnguyen.pdf.

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L'objectif de ce travail est de faire ressortir l'influence de l'aérodynamique du sillage d'un obstacle sur les mécanismes de stabilisation de la flamme non prémélangée. Cette aérodynamique est régie non seulement par la dynamique des écoulements mais aussi et surtout par la géométrie de l'accroche-flamme. Elle a été étudiée sur une configuration expérimentale non confinée de deux écoulements (combustible et air) séparés, concentriques, et dans le cas de deux stabilisateurs simplifiés (disque et tulipe). Des visualisations directes ont été réalisées et complétées par des mesures quantitatives

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Books on the topic "Cores for flakes"

1

Ravino, Jerry. Hearts of iron: The epic struggle of the 1st Marine Division Flame Tank Platoon, Korean War, 1950-1953. Turner Pub. Co., 2011.

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Monod de Froideville, Gilbert, and Mark Verheul. An Experts' Guide to International Protocol. Amsterdam University Press, 2016. http://dx.doi.org/10.5117/9789462981058.

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Although modern life grows increasingly casual, in many sectors, protocol still reigns supreme. An Expert's Guide to International Protocol offers an overview of its associated practices, including those found within the context of diplomatic relations and the business world. Focusing on a wide range of countries and cultures, the book covers topics like seating arrangements, the history and use of flags, ceremonies, invitations and dress codes, and gifts and decorations. Throughout, influential diplomatic, business, cultural, and sports figures share their own experiences with protocols aroun

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Ravino, Jerry. Flame Dragons of the Korean War. Turner Pub. Co., 2003.

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Monod de Froideville, Gilbert, and Mark Verheul. An Experts' Guide to International Protocol. Amsterdam University Press, 2021. http://dx.doi.org/10.5117/9789463727167.

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Although modern life grows increasingly casual, in many sectors, protocol still reigns supreme. An Expert's Guide to International Protocol offers an overview of its associated practices, including those found within the context of diplomatic relations and the business world. Focusing on a wide range of countries and cultures, the book covers topics like precedence, seating arrangements, flags, ceremonies, invitations, dress codes, gifts and honours, and the roles of the protocol officer, guest and host. Throughout, influential diplomatic, business, and cultural figures share their own experie

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Kleber, Brooks E. The Chemical Warfare Service: Chemicals in combat. Center of Military History, United States Army, 2003.

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Kleber, Brooks E. The Chemical Warfare Service: Chemicals in combat. Center of Military History, U.S. Army, 2002.

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Beuningen, Cor, and Kees Buitendijk, eds. Finance and the Common Good. Amsterdam University Press, 2019. http://dx.doi.org/10.5117/9789463727914.

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Over the past fifty years, (financial) capitalism has brought about an enormous growth in wealth. Millions around the world have been lifted out of poverty. However, the downsides of the present global economic constitution are rapidly becoming evident as well. Rising inequality, soaring debt levels, and repeated cycles of boom and bust have proven to be some of its key characteristics. After the 2008 crisis brought the financial system to the brink of collapse, new regulations, stricter supervision, higher capital requirements, and ethical codes were introduced to the sector. Today we find ou

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Barg, Alexander, and O. R. Musin. Discrete geometry and algebraic combinatorics. American Mathematical Society, 2014.

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Ayala, Francisco J., and Camilo J. Cela-Conde. Lithic traditions: tool-making. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198739906.003.0007.

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This chapter is dedicated to the lithic traditions. It analyzes the pre-cultural cores and flakes produced by chimpanzees for cracking nuts and the evidence of their using bones as tools. Next, the chapter describes the first lithic tradition (Mode 1 or Oldowan), the transition from Mode 1 to 2 (Acheulean culture), and the process for producing the first Acheulean tool, the biface. Mode 2 dispersal separates, by means of the “Movius line,” the localities in Africa, Europe, and Western Asia, which display bifaces, and those in Eastern Asia, which lack them. The cultural use of fire precedes the

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Goodin, Robert E., and Kai Spiekermann. Headline Findings, Central Implications. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198823452.003.0020.

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This chapter summarizes the core findings and implications of the book, offering an accessible reminder and an overview for readers in a hurry. The first section lists headline findings. The second section enumerates central implications for political practice. The third section insists, one last time, that ‘getting it right’ matters. We conclude that democracy, for all its perceived or real flaws, comes with the greatest epistemic expectations.

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Book chapters on the topic "Cores for flakes"

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Komossa, S. "X-Ray Flares in the Cores of Galaxies." In The Universe in X-Rays. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-34412-4_21.

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Bordeleau, André G. "Sun-Bearing Flags: Here Comes the Sun." In Flags of the Night Sky. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-0929-8_4.

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Mawad, Ramy. "The Central Distance Distribution of Hα and γ-ray Burst Solar Flares." In Springer Proceedings in Physics. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-3276-3_11.

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Abstract The angular distance of the solar flares to the projective point of the center of the solar disk on the solar spherical surface has been studied by the heliographical or helioprojective coordinates, during the periods 1975–2021 for GOES events and 2002–2021 for RHESSI events, hereafter “distance.” It gives a specific distribution curvature. It has also been noted that when using the number of solar flare events in each satellite, GOES or RHESSI, or even using the sum of the flux (class) or importance parameter, it obtains the same result, which is that the shape of the distribution cu

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Reames, Donald V. "Distinguishing the Sources." In Solar Energetic Particles. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66402-2_3.

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AbstractOur discussion of history has covered many of the observations that have led to the ideas of acceleration by shock waves or by magnetic reconnection in gradual and impulsive solar energetic particle (SEP) events, respectively. We now present other compelling observations, including onset timing, SEP-shock correlations, injection time profiles, high-energy spectral knees, e/p ratios, and intensity dropouts caused by a compact source, that have helped clarify these acceleration mechanisms and sources. However, some of the newest evidence now comes from source-plasma temperatures. In this

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Fujino, Haruka, and Masayuki Inoue. "Convergent Total Synthesis of Hikizimycin: Development of New Radical-Based and Protective Group Strategies." In Modern Natural Product Synthesis. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1619-7_6.

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AbstractHikizimycin (1) is an architecturally complex nucleoside antibiotic with potent anthelmintic and antibacterial activities. Its unique 4-amino-4-deoxyundecose core (hikosamine) includes a C1–C11 linear chain with ten contiguous stereocenters flanked with nucleobase (cytosine) and 3-amino-3-deoxyglucose (kanosamine) at the C1 and C6O positions, respectively. These structural features make its chemical construction exceptionally challenging. This chapter describes our successful efforts leading to convergent total synthesis of 1 from three hexose derivatives (5b, 11-β, and 12) and bis-TMS

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MacDonald, Margaret E. "The Place of Traditional Birth Attendants in Global Maternal Health: Policy Retreat, Ambivalence and Return." In Global Maternal and Child Health. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-84514-8_6.

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AbstractIn this chapter, I tell the story of the waxing and waning of the status of the traditional birth attendant (TBA) in global maternal health policy from the launch of the Safe Motherhood Initiative in 1987 to the present. Once promoted as part of the solution to reducing maternal mortality, the training and integration of TBAs into formal healthcare systems in the global south was deemed a failure and side-lined in the late 1990s in favour of ‘a skilled attendant at every birth’. This shift in policy has been one of the core debates in the history of the global maternal health movement

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Sholl, Robert. "5. Artistic Practice as Embodied Learning." In Teaching Music Performance in Higher Education. Open Book Publishers, 2024. http://dx.doi.org/10.11647/obp.0398.07.

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Almost fourty-five years ago, Joseph Kerman proposed the notion of getting out of analysis, in fact a strategy through criticism to broaden its formalist parameters (Kerman, 1980). Kerman’s argument was flawed in many respects as Agawu pointed out; analysis was necessary in his view to teach “undergraduate music theory” and “basic musical literacy,” (Agawu, 2004: 269) something Kerman would not have denied. Yet these debates, and their continuation (Horton 2020; Cavett et al. 2023) have missed something more fundamental, especially as ideological ivory towers and territories needed protection.

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Hall, Robert L. "Cognitive Cores and Flint Flakes." In The Life of Symbols. Routledge, 2019. http://dx.doi.org/10.4324/9780429312311-11.

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Ensor, H. Blaine. "Capps." In Early Human Life on the Southeastern Coastal Plain. University Press of Florida, 2018. http://dx.doi.org/10.5744/florida/9781683400349.003.0003.

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A comprehensive lithic study is provided for an unusual core and flake technology made from chert sources in southeast Alabama that are heavily weathered due to age. Named Capps technology from chert artifacts there and at the Shelley site, it is compared in detail to the Old World Levallois technology with several similarities such as disc cores. Although the assemblage is derived from a surface collection, it is substantially different from Clovis and later Holocene cores and flakes.

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Moncel, Marie-Hélène. "Un bouquet d’ancêtres." In Un bouquet d’ancêtres. CNRS Éditions, 2021. https://doi.org/10.3917/cnrs.coppe.2021.01.0285.

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Dans cet article, nous proposons un bilan des principaux sites européens depuis les premières occupations jusqu’à 500 ka, avant le MIS 12. Les industries des « cores-and-flakes » sont tardives, datées de 1,5-1,4 Ma, principalement localisées dans le sud. Elles peuvent provenir d’Afrique, du Levant ou d’Asie où des traditions similaires ont persisté, tandis que les premières dispersions de l’Acheuléen ont quitté l’Afrique pour le Levant dès 1,4 Ma. La technologie des « cores-and-flakes » a persisté après l’arrivée de la technologie bifaciale à partir de 900 ka et surtout 700 ka. Un Acheuléen él

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Conference papers on the topic "Cores for flakes"

1

Martin, Evandro R. "30 Years Lifetime with No Maintenance Needed in Splash Zones!!!" In LatinCORR 2023. AMPP, 2023. https://doi.org/10.5006/lac23-20440.

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Extended Abstract The purpose of this paper is to present a proven coating system that can perform for more than 30 years corrosion protection with no maintenance in splash zones. This coating system technology, Special Flake Glass Polyester (SFGP) has been reintroduced in the new edition of Norsok M501 for paint system 7A and 7D emphasizing that very high durability has been experienced with glass flake polyester coatings. Polyesters are extremely tough and durable polymers used in aircraft, vehicle, and marine construction, even fake marble kitchen table-top can be made of polyesters. For th

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Li, Linye, Xiaojing Tian, Shengming Yin, et al. "Flame Interaction and Stabilization Mechanisms in a Dual Premix Swirl Combustor With a Pilot Bluff Body." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-128941.

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Abstract The utilization of centrally-staged lean-premixed swirl combustion is prevalent due to its capacity for stable flame maintenance and reduced emissions. The configuration of the pilot and main flames, whether they are stratified or merged, significantly influences flame behavior and combustion dynamics. This study explores the underlying mechanisms of merged and stratified flames in a newly designed dual-swirl model combustor. Utilizing a 10 kHz PIV/OH* synchronized measurement and a 20 kHz CH2O PLIF method, we delineate the flame and flow structures under varying Air Split Ratios (ASR

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Turner, Ken, and Kevin Polito. "Nickel Flakes: Past, Present and Future." In ISTFA 2019. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.istfa2019p0405.

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Abstract Pure nickel lidded TO style packages are a common packaging type for active microelectronics with application in various fields including commercial, aerospace and defense. This paper will focus on the history of nickel flakes in the industry, current trends and failure analysis findings, and future considerations for this potential failure mechanism. In 2004 Hi-Rel Laboratories became involved in an important nickel flake study which led to further inspections to document and evaluate nickel flakes in TO style lids from various customers and manufacturers. Through 2015 these inspecti

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Jeffries, Jay B., Norbert Heberle, Gregory P. Smith, and David R. Crosley. "Simultaneous Laser-Induced Fluorescence and Rayleigh Scattering Measurements for Precise Determination of Flame Structure." In Laser Applications to Chemical and Environmental Analysis. Optica Publishing Group, 1998. http://dx.doi.org/10.1364/lacea.1998.lwa.4.

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Nearly one third of all natural gas is consumed in Bunsen-type burners, partially premixed flames which have a fuel-rich premixed flame forming an inner core surrounded by a diffusion flame. Pollutant emissions of nitrogen oxides, NOx, in these flames are an important concern. The NO is produced by two chemical pathways, the thermal (Zeldovich) and the prompt (Fenimore) mechanisms. For temperatures below 2000 K, the thermal pathway is minimized because of the high activation energies of the rate-limiting chemical reactions. Thus, at the flame temperatures found in partially premixed flames, th

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Chaouadi, Rachid, Robert Gérard, and Eric van Walle. "Fracture Toughness Characterization of Vessel Forging With Hydrogen Flaked Specimens." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63632.

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The 2012 in-service vessel inspections performed at Doel-III and Tihange-II Nuclear Power Plant revealed a large number of ultrasonic indications in the forged core shells suggesting nearly-laminar defects attributed to hydrogen flakes induced during the component manufacturing process. These observations have initiated a very large experimental test program not only for reliably and accurately characterizing the ultrasonic indications but also to characterize the mechanical properties in presence of hydrogen flakes. A key point of the Safety Case was the justification of the material properti

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Sattelmayer, Thomas, Christoph Mayer, and Janine Sangl. "Interaction of Flame Flashback Mechanisms in Premixed Hydrogen-Air Swirl Flames." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25553.

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An experimental study is presented on the interaction of flashback originating from flame propagation in the boundary layer (1), from combustion driven vortex breakdown (2) and from low bulk flow velocity (3). In the investigations, an aerodynamically stabilized swirl burner operated with hydrogen-air mixtures at ambient pressure and with air preheat was employed, which previously had been optimized regarding its aerodynamics and its flashback limit. The focus of the present paper is the detailed characterization of the observed flashback phenomena with simultaneous high speed PIV/Mie imaging,

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Hossain, Md Amzad, Md Nawshad Arslan Islam, and Ahsan Choudhuri. "Flame Imaging of Highly Turbulent Premixed Methane-Air Combustion Using Planar Laser Induced Fluorescence (PLIF) of CH (C-X)." In ASME 2019 Power Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/power2019-1894.

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Abstract The article presents an investigation of CH (C-X) planar laser induced fluorescence imaging (PLIF) of highly turbulent methane-air flames inside a windowed combustor. Flame dynamics and flame growth and evolution of methane-air flames stabilized over a backward facing step at high Reynolds Number (Re) (Re = 15000 and Re = 30000) with an equivalence ratio of 0.7 are discussed. It was observed that the flame evolution was faster at Re = 30000 than that of Re = 15000. The rate of initiation or formation of wrinkles, detachment of the wrinkles and burnout of the burned gases from the flam

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Gorski, Jan, Wajid Ali Chishty, and Matthew Johnson. "Flame Response Analysis of Syngas." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25409.

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The motivation for the work comes from the requirement to assess the feasibility of using alternative fuels in lean-premixed land-based stationary gas turbine combustion systems. Lean-premixed systems are prone to combustion instability issues and the need is to determine how the use of alternative fuels would affect such instabilities. The paper presents the results of an acoustically-forced laminar flat flame study that was conducted to measure the influence of flow velocity oscillations on the response of syngas flames under various operating conditions and in comparison to natural gas flam

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Chakraborty, Aritra, and Satya R. Chakravarthy. "Formation of Soot in Ethylene-Air Partially Premixed Flames Over a Wide Range of Premixedness." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64770.

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This paper reports an investigation of soot formation in ethylene-air partially premixed flames over a wide range of premixedness. An axisymmetric co-flow configuration is chosen to establish partially premixed flames from the fully non-premixed to fully premixed conditions. Reducing the fuel flow rate as a percentage of the maximum from the core stream and supplying the same to the annular stream leads to stratification of the reactant concentrations. The thermal power, overall equivalence ratio, and the average velocity in the both streams are maintained constant under all conditions. The so

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Ekoto, Isaac W., William G. Houf, Adam J. Ruggles, Leonard W. Creitz, and Jimmy X. Li. "Large-Scale Hydrogen Jet Flame Radiant Fraction Measurements and Modeling." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90535.

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Analytic methods used to establish thermal radiation hazard safety boundaries from ignited hydrogen plumes are based on models previously developed for hydrocarbon jet fires. Radiative heat flux measurements of small- and medium-scale hydrogen jet flames (i.e., visible flame lengths < 10 m) compare favorably to theoretical calculations provided corrections are applied to correct for the product species thermal emittance and the optical flame thickness. Recently, Air Products and Chemicals Inc. commissioned flame radiation measurements from two larger-scale hydrogen jet flames to determine t

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Reports on the topic "Cores for flakes"

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Wilkowski, G. M., D. Rudland, P. Mincer, B. Metrovich, and D. Rider. L52249 Failure Initation Modes of Pipe with High Charpy Transition Temperature. Pipeline Research Council International, Inc. (PRCI), 2007. http://dx.doi.org/10.55274/r0012041.

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This report presents a methodology that determines the lowest temperature where ductile fracture would occur for either sharp cracks or blunt corrosion flaws in older low-toughness line pipe base metals. It is applicable to either axial or circumferential flaws in pipes under quasi-static loading, i.e., normal operating conditions with no sudden transient loads. The results showed that ductile initiation of a surface crack can occur at a significantly lower temperature than the Charpy transition temperature. A master curve of transition temperatures for different pipe thickness and crack geome

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LePain, D. L., and Simone Montayne. Core fragment descriptions, Exxon core holes, uplands bordering Yukon Flats basin, east-central Alaska. Alaska Division of Geological & Geophysical Surveys, 2017. http://dx.doi.org/10.14509/29576.

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Wilkowski, Gery. L52249 Failure Initiation Modes of Pipe with High Charpy Transition Temperature. Pipeline Research Council International, Inc. (PRCI), 2004. http://dx.doi.org/10.55274/r0010352.

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This project was developed to establish a general methodology to; (a) determine a simple way to assess what is the lowest temperature where ductile crack initiation will occur for a sharp crack or a blunt flaw (i.e., corrosion), (b) to developed several optional approaches to predict the transition temperature shifts that depend on what type of lab specimen data are available, and (c) show validation from past tests as well as by conducting tests on older vintage linepipe steels. This report presents a methodology that determines the lowest temperature where ductile fracture would occur for ei

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Bernau, Jeremiah A., Charles G. Oviatt, Donald L. Clark, and Brenda B. Bowen. Sediment Logs Compiled From the Great Salt Lake Desert, Western Utah, With a Focus on the Bonneville Salt Flats Area. Utah Geological Survey, 2023. http://dx.doi.org/10.34191/ofr-754.

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Sediment logs from exposures, excavations, cores, and wells are valuable records that can be used to interpret depositional records, aquifer extents, and geologic structures. Here we present sediment logs compiled from the Great Salt Lake Desert (GSLD) in western Utah with a specific focus on the Bonneville Salt Flats area. The logs are grouped into three categories (shallow, alluvial fan, and deep) that may be used to explore different aspects of GSLD deposition.

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Moynihan, Emily, and James O’Donoghue. The Forefront : A Review of ERDC Publications, Summer 2022. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/44862.

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As the main research and development organization for the US Army Corps of Engineers (USACE), the Engineer Research and Development Center (ERDC) helps solve our nation’s most challenging problems. With seven laboratories under the ERDC umbrella, ERDC expertise spans a wide range of disciplines. This provides researchers an amazing network of collaborators both within labs and across them. Many of the publications produced by ERDC through the Information Technology Laboratory’s Information Science and Knowledge Management Branch (ISKM), the publishing authority for ERDC, are a testament to the

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Hildner, R. A., and S. J. Zygmunt. Build Rocky Flats Environmental Technology site production prototype modular treatment system for stand alone core capability for residue unpack, sort, assay, repack. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/475670.

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King, E. L., A. Normandeau, T. Carson, et al. Pockmarks, a paleo fluid efflux event, glacial meltwater channels, sponge colonies, and trawling impacts in Emerald Basin, Scotian Shelf: autonomous underwater vehicle surveys, William Kennedy 2022011 cruise report. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331174.

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A short but productive cruise aboard RV William Kennedy tested various new field equipment near Halifax (port of departure and return) but also in areas that could also benefit science understanding. The GSC-A Gavia Autonomous Underwater Vehicle equipped with bathymetric, sidescan and sub-bottom profiler was successfully deployed for the first time on Scotian Shelf science targets. It surveyed three small areas: two across known benthic sponge, Vazella (Russian Hat) within a DFO-directed trawling closure area on the SE flank of Sambro Bank, bordering Emerald Basin, and one across known pockmar

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Robert-Lachaine, Xavier, Hakim Mecheri, Denis Denys, and Christian Larivière. Élaboration et faisabilité d'application d'une méthode d'évaluation biomécanique de l'exposition physique lors du port d'exosquelettes en milieu de travail. IRSST, 2025. https://doi.org/10.70010/crod7506.

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La prévalence des troubles musculosquelettiques (TMS) liés au travail physique reste prédominante selon les données épidémiologiques. Les récentes avancées technologiques des exosquelettes représentent une opportunité pour la prévention des TMS. Des études ont montré que les exosquelettes peuvent réduire l'activité musculaire pendant des tâches spécifiques en laboratoire. Cependant, très peu d'études ont évalué les exosquelettes directement sur le lieu de travail. L'objectif est d’élaborer une méthode d’évaluation de l'efficacité des exosquelettes à réduire l'exposition physique des travailleu

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Ohad, Itzhak, and Himadri Pakrasi. Role of Cytochrome B559 in Photoinhibition. United States Department of Agriculture, 1995. http://dx.doi.org/10.32747/1995.7613031.bard.

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The aim of this research project was to obtain information on the role of the cytochrome b559 in the function of Photosystem-II (PSII) with special emphasis on the light induced photo inactivation of PSII and turnover of the photochemical reaction center II protein subunit RCII-D1. The major goals of this project were: 1) Isolation and sequencing of the Chlamydomonas chloroplast psbE and psbF genes encoding the cytochrome b559 a and b subunits respectively; 2) Generation of site directed mutants and testing the effect of such mutation on the function of PSII under various light conditions; 3)

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RETROFIT EFFECT AND FLEXURAL CAPACITY OF H-SECTION BEAM- THROUGH BEAM-COLUMN CONNECTIONS FOR STEEL MODULAR FRAMES. The Hong Kong Institute of Steel Construction, 2025. https://doi.org/10.18057/ijasc.2025.21.2.4.

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Beam-through steel beam-column configurations are distinct from traditional column-through steel structures because they discontinue columns at each floor by bolting upper and lower columns to floor beam flanges. It facilitates modular manufacturing and floor/modular erection, which provides more opportunities for low to mid-level steel structures. Compared to its constructability superiority, beam-through configurations typically create a weaker beam-column joint than traditional beam-column connections adopted in the current building codes. In a numerical approach, this study investigates th

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