Academic literature on the topic 'Extraneous material'

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Journal articles on the topic "Extraneous material"

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Lancette, Gayle A., Michael Curiale, Ewen C. D. Todd, Walter W. Bond, Cynthia Szymanski, Sterling S. Thompson, Ann marie Mcnamara, et al. "Committee on Microbiology and Extraneous Material." Journal of AOAC INTERNATIONAL 81, no. 1 (January 1, 1998): 230–33. http://dx.doi.org/10.1093/jaoac/81.1.230.

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Haralambous, Nicola. "Juries and Extraneous Material: A Question of Integrity." Journal of Criminal Law 71, no. 6 (December 2007): 520–33. http://dx.doi.org/10.1350/jcla.2007.71.6.520.

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This article challenges the unconditional faith seemingly placed on juries by the judiciary. Despite the prohibition on investigation into jury deliberations, a number of important cases have come to light which invite questions on the extent to which we can be sure that juries follow judicial directions. This article explores the recent case law in which juries may have relied upon extraneous material or other external influences and, finally, briefly compares such impropriety with the use of jurors with specialised knowledge.
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Hofmann, Marcel, Dirk Wenzel, Bernd Gulich, Heike Illing-Günther, and Daisy Nestler. "Development of Nonwoven Preforms Made of Pure Recycled Carbon Fibres (rCF) for Applications of Composite Materials." Key Engineering Materials 742 (July 2017): 555–61. http://dx.doi.org/10.4028/www.scientific.net/kem.742.555.

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For the development of an efficient and economic recycling process of carbon fibers (CF) still many technological challenges have to be mastered. One of them is the removal of all extraneous natural and synthetic fibres, e.g. polyester sewing threads. The objective of the research was to develop an in-line process for the removal of those extraneous fibres, which result from mechanical processes such as tearing. A promising approach for the removal of extraneous fibres from cut-off carbon-fibre material (CF) has been identified, getting recycled carbon fibres (rCF). For that purpose, the use of modern laser technologies is particularly promising. However, the focus was not the development of new laser systems, but the adaptation of existing technologies and their integration into textile processing steps for carbon fibre recycling. In addition to the removal of the extraneous fibres, the degree of CF losses and quality degradation due to fibre damage have been analysed and compared with optimum fibre characteristics. The separation has been experimented and corresponding laser parameters have been defined. Finally, the obtained carbon-fibre material has been tested with regard to its processability in textile manufacturing processes (dry non-woven fabric production) up to carbon fibre reinforced plastics (CFRP). For the evaluation of the material for potential applications, test plates from irradiated and non-irradiated material have been used. The performed tensile and flexural tests have proved that the irradiated material has similar properties compared to the non-exposed one.
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TAKAYASU, Susumu, Tatsuo SHIMADA, and Hiroaki KAWASATO. "Identification of Extraneous Material by Analytical Electron Microscopy in Scar Sarcoidosis." Nishi Nihon Hifuka 54, no. 6 (1992): 1079–82. http://dx.doi.org/10.2336/nishinihonhifu.54.1079.

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Cerpa, Narciso, Paul Chandler, and John Sweller. "Some Conditions under Which Integrated Computer-Based Training Software Can Facilitate Learning." Journal of Educational Computing Research 15, no. 4 (December 1996): 345–67. http://dx.doi.org/10.2190/mg7x-4j8n-ckyr-p06t.

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When students are required to learn a new computer application program, frequently they need to split their attention between material in a manual and material on the screen because neither is self-contained. Previous work has indicated that split-attention can interfere with learning because the need to mentally integrate material imposes an extraneous cognitive load. Alternatively, even if the screen-based material is self-contained, the material of a redundant manual, if processed by learners, can also impose an extraneous cognitive load. Under these circumstances, learning may be facilitated by the use of self-contained, screen-based material alone. In Experiment 1, the first author developed a windows spreadsheet, computer-based training package with an integrated format, to test these hypotheses. The split-attention effect was investigated by comparing the performance of a group of students using the integrated computer-based training software with that of a group using a conventional manual plus the computer software to be learned. The redundancy effect was investigated by comparing a group using the computer-based training software with a group using the same computer-based training software plus a hard-copy of this training software. Results from Experiment 1 supported the above cognitive load hypotheses. Specifically, in areas of high information complexity, the integrated computer-based training software group clearly outperformed both the conventional manual plus computer software group, and the computer-based training software plus hard-copy group, thus demonstrating both split-attention and redundancy effects. Experiment 2 partially replicated this result, as well as providing support for a cognitive load explanation of results by measuring mental load. In the light of these findings and previous research, it is suggested that cognitive load is a major factor in all aspects of instructional design. Computer training software that reduces extraneous cognitive load by adopting integrated computer-based training formats can considerably facilitate learning.
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French, Duncan. "Treaty Interpretation And The Incorporation Of Extraneous Legal Rules." International and Comparative Law Quarterly 55, no. 2 (April 2006): 281–314. http://dx.doi.org/10.1093/iclq/lei082.

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AbstractThis paper considers under what circumstances, and for what reasons, an international tribunal may want to range beyond the primary text of a treaty to determine its ‘correct’ meaning; such extraneous legal material potentially including rules of customary international law, other treaties between the parties, general principles of law, and documents of a ‘soft law’ nature. The paper suggests a variety of ‘mechanisms’ by which a tribunal may undertake a broader interpretative approach, though all ultimately raise the same inevitable tension between accusations of judicial activism and counter-arguments of inflexibility and insularity. Nevertheless, many tribunals and individual judges continue to utilize such techniques, particularly noticeable in some recent environmental disputes. The paper will conclude with a note of caution; that though such interpretations are becoming an increasingly significant part of modern judicial decision-making—something that is generally to be welcomed—tribunals must concurrently take care to ensure that they remain within the accepted parameters of the adjudicative function.
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Meng, Xianlong, Long Zhao, Haitao Guo, Feng Sha, Huihu Shi, Zhaojun Wu, and Jianbin Zhang. "Utilization of a CO2 Storage Material: Shape-Controlled Preparation of CaCO3 Microspheres." Crystals 9, no. 8 (August 20, 2019): 433. http://dx.doi.org/10.3390/cryst9080433.

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Homogeneous CaCO3 microspheres were controllably synthesized via a simple hydrothermal method without using extraneous additives by Ca(OH)2 saturated solution reacted with CO2 storage material (CO2SM), which was obtained by absorbing CO2 gas in a system containing equimolar ethylenediamine (EDA) and polyethylene glycol 400 (PEG). Specifically, homogeneous pure vaterite spheres were obtained by using 160 g/L CO2SM solution at 100 °C and a reaction time of two hours. It is noteworthy that the EDA and PEG, which are released from CO2SM, have dual functions as a CO2 absorber and crystal regulator in the process of controlling the crystallization of CaCO3 crystals.
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Haenssgen, Kati, Andrew N. Makanya, and Valentin Djonov. "Casting Materials and their Application in Research and Teaching." Microscopy and Microanalysis 20, no. 2 (February 25, 2014): 493–513. http://dx.doi.org/10.1017/s1431927613014050.

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AbstractFrom a biological point of view, casting refers to filling of anatomical and/or pathological spaces with extraneous material that reproduces a three-dimensional replica of the space. Casting may be accompanied by additional procedures such as corrosion, in which the soft tissue is digested out, leaving a clean cast, or the material may be mixed with radiopaque substances to allow x-ray photography or micro computed topography (µCT) scanning. Alternatively, clearing of the surrounding soft tissue increases transparency and allows visualization of the casted cavities. Combination of casting with tissue fixation allows anatomical dissection and didactic surgical procedures on the tissue. Casting materials fall into three categories namely, aqueous substances (India ink, Prussian blue ink), pliable materials (gelatins, latex, and silicone rubber), or hard materials (methyl methacrylates, polyurethanes, polyesters, and epoxy resins). Casting has proved invaluable in both teaching and research and many phenomenal biological processes have been discovered through casting. The choice of a particular material depends inter alia on the targeted use and the intended subsequent investigative procedures, such as dissection, microscopy, or µCT. The casting material needs to be pliable where anatomical and surgical manipulations are intended, and capillary-passable for ultrastructural investigations.
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Eliana, Eliana, Hepsi Nindiasari, and Cecep Anwar Hadi Firdos Santosa. "DEVELOPMENT OF E-LEARNING TEACHING MATERIALS ON MATRICES BASED ON COGNITIVE LOAD THEORY." Prima: Jurnal Pendidikan Matematika 5, no. 1 (January 28, 2021): 47. http://dx.doi.org/10.31000/prima.v5i1.2997.

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Learning will be effective if it can minimize extraneous cognitive load because students' understanding can be improved and stored in long-term memory. The purpose of this study was to determine the development of e-learning teaching materials on matrices based on cognitive load theory that is valid, practical, and effective. The development of this teaching material uses e-LKS (electronic student worksheet) with the help of a liveworksheet and presents example-based learning. This study uses the ADDIE development model. The development steps used are (1) analysis, (2) design, (3) development, (4) implementation, (5) evaluation. Valid test based on expert judgment shows that e-learning teaching materials on matrices based on cognitive load theory get an average of 4.25 with very valid category so that this teaching material is feasible to use. The practicality test based on the student response questionnaire showed that this teaching material obtained an average of 79.7% with a good category, and the evaluation test showed that this teaching material obtained an average of 78.6% with student completeness in learning so it can be concluded that e-learning teaching materials on matrices based on cognitive load theory can be said to be effective.
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Gomes, Fernando José Borges, Jorge Luiz Colodette, Auphélia Burnet, Larisse Aparecida Ribas Batalha, Fernando Almeida Santos, and Iara Fontes Demuner. "Thorough Characterization of Brazilian New Generation of Eucalypt Clones and Grass for Pulp Production." International Journal of Forestry Research 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/814071.

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Eucalypt wood is becoming the most important raw material for the pulp industries in South America. However, due to the high wood cost in comparison to other raw material sources, nonwoody materials are also being investigated aiming at pulp production. In this way, this paper aimed at the evaluation of eighteen eucalypt clones obtained from the Brazilian Genolyptus project, regarding their potential characteristics for pulp production. Aiming at the same goal, two species of elephant grass were also evaluated as alternative raw material sources. Through the analyses of the anatomic and chemical characteristics, five eucalypt clones and one elephant grass species were indicated for pulp production and biorefinery application. The results of this study indicate the high technological quality ofEucalyptusclones evaluated and indicate that they can be used for biorefinery applications since they have the suitable characteristics. In general, the eucalypt clones are less moist and denser and contain fewer minerals and extraneous materials than the elephant grass species, which make them more attractive for utilization in deconstruction studies aiming at production of bioproducts.
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Dissertations / Theses on the topic "Extraneous material"

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Culbreth, Phyllis Devan. "How does extraneous textbook material influence the reading comprehension of normal and impaired college students? /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/culbrethp/phyllisculbreth.pdf.

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Petkevičienė, Diana. "INHIBITORINIŲ MEDŽIAGŲ NUSTATYMO PIENE METODŲ PALYGINIMAS." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140618_233130-42882.

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Magistro baigiamajame darbe tyrimams atlikti naudoti metodai, kurie taikomi tetraciklinų ir β-laktamų grupės antibiotikų likučiams piene nustatyti: Imunofermentinės analizės ELISA; spektrometrijos analizės tyrimas; COWSIDE® II; DELVOTEST®; CHARM BLUE-YELLOW II; ROSA. Spartieji metodai, pvz. COWSIDE II, DELVOTEST, CHARM BLUE-YELLOW II ir ROSA yra pakankamai pigūs, tačiau mažesnio jautrumo ir nenustato tikslios koncentracijos. Lėtesni metodai, pvz. ELISA ir SPEKTROMETRINĖS ANALIZĖS, yra pakankamai brangūs, tačiau pakankamai tikslūs ir galima nustatyti tikslią antibiotikų koncentraciją.
Master's thesis research used methods to determine for tetracycline and β-lactam antibiotics residues in milk: Immunosorbent assay ELISA; spectrometric analysis; COWSIDE ® II; DELVOTEST ®; CHARM BLUE YELLOW-II; ROSA. Quick techniques, such as: COWSIDE II; DELVOTEST, CHARM BLUE YELLOW-II and ROSA are fairly cheap, but a lower sensitivity and does not the exact concentration. Slower methods, eg. ELISA and spectrometric analysis, is expensive enough, but precise enough to determine the exact concentration of antibiotics.
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Nickoley, Tyler R. "Method of physical and enzymatic concentration of extraneous materials in wheat flour to enable near infrared chemical imaging." Thesis, 2018. http://hdl.handle.net/2097/38803.

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Master of Science
Food Science Institute
David L. Wetzel
Grain processing and handling requires quality determinations to ensure wholesome products that meet or surpass legal standards and specifications required by the end consumer. Near infrared spectroscopy has proven to be a useful and versatile tool to enable grain processers to make adjustments as needed. Near infrared chemical imaging also provides spatial information within the image and relative composition of chemically distinct components within the product. The potential use of chemical imaging to determine extraneous material in bread baking quality flour was addressed. A specimen preparation technique was developed. Insect fragment spiked specimens were imaged to determine their imaging effectiveness for application near the allowable limit of insect fragment concentration. Imaging was achieved using indium antimonide array detection of diffusely reflected radiation. The detector array of 81,920 pixels collected radiation from an area of 30.72 mm by 38.4 mm with a pixel size of 120 µm². Spectra were collected simultaneously from each pixel without moving parts by scanning with a liquid crystal tunable filter. Partial least squares analysis of each pixel within the sample allowed a summation of the insect quantity. The chemical structural distinction of chitin in the high protein matrix of the insect residue was in contrast to the non-digested carbohydrate residue in the lesser protein matrix of the flour. The method developed provided a linear response for a concentration range from approximately half the allowable limit to twice the limit for two insects that commonly contaminate flour. For the two insects studied the slopes are comparable with a slight off-set over a practical working range, so that insect concentration can be determined independently of species recognition.
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Book chapters on the topic "Extraneous material"

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Couderc, Christophe. "Sobre el papel de Lope de Vega en la construcción del relato nacional del clasicismo francés." In Studi e saggi, 23–39. Florence: Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-150-1.4.

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This essay deals with an aspect of the formation process of the image of the Spanish Baroque theatre in France as an irregular and chaotic aesthetic form, which was also considered inferior with respect to the French classical model. In this theoretical construction, Lope de Vega embodies all of the Spanish theatre's flaws and, more generally, Hispanic literature's ones, in turn conceived as an expression of the Spanish nation’s spirit. This process of elaborating an image of an author at the service of the invention of a national stereotype is possible thanks to the early reception of some prose works by Lope (La Arcadia, El peregrino en su patria) which are enjoying a widespread diffusion in their translations. In a context marked by controversy surrounding the tragi-comédie, assimilated by his detractors to a simple theatrical deformation of novelistic material, Lope de Vega assumes the function of representative of a literature considered extraneous to any rule and to the separation between literary genres.
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Nielsen, S. Suzanne. "Examination of Foods for Extraneous Materials." In Food Analysis Laboratory Manual, 137–43. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-1463-7_17.

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Nielsen, S. Suzanne. "Examination of Foods for Extraneous Materials." In Food Analysis Laboratory Manual, 113–18. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-5250-2_16.

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Deng, Pu, Mallikarjun Karadge, Raul B. Rebak, Vipul K. Gupta, Bart C. Prorok, and Xiaoyuan Lou. "The Role of Extraneous Oxygen in the Formation of Oxide Inclusions in 316L Stainless Steel Manufactured by Laser Powder Bed Fusion." In Thermomechanics & Infrared Imaging, Inverse Problem Methodologies and Mechanics of Additive & Advanced Manufactured Materials, Volume 7, 75–80. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-59864-8_12.

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"Filth and Extraneous Material in Food." In Food Science and Technology. CRC Press, 2002. http://dx.doi.org/10.1201/9780203910566.ch6.

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"Filth and Extraneous Material in Food." In Food Plant Sanitation, 96–104. CRC Press, 2002. http://dx.doi.org/10.1201/9780203910566-12.

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Auger, Peter. "Writing for the Inner Eye." In Du Bartas' Legacy in England and Scotland, 178–209. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198827818.003.0008.

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Abraham Cowley reacted against the tradition of divine poetry that Du Bartas embodied, arguing that scriptural poets needed to have technical expertise and spiritual insight. As later seventeenth-century poets like Thomas Heywood, John Perrot, and Samuel Pordage became aware of the limits of simply describing literal truths from the Bible and natural world, they reverted to allegorical and other figurative narrative structures that could accommodate higher truths to the human imagination and describe psychological experience. John Milton had known Sylvester’s translation since he was a teenager, but Paradise Lost makes purposeful allusions that surpass Devine Weekes, showing how difficult it is to apprehend divine truth, and how interpretation depends on our point of view. Lucy Hutchinson’s meditations on Genesis revise Du Bartas’ poetics to strip away extraneous material that distracts from scriptural truth.
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Waters, Sarah. "Orange on the Inside." In Suicide Voices, 139–70. Liverpool University Press, 2020. http://dx.doi.org/10.3828/liverpool/9781789622232.003.0005.

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Chapter four examines the suicide crisis at France Télécom, situating this in the shift to a new finance-driven management model, following the company’s privatisation, whereby the search for shareholder value became the overarching strategic goal of the company. I draw on scholarship on financialisation and in particular, the rise of shareholder value, examining its impact on the changing status and conditions of labour. Suicides were not an aberration in an otherwise smooth-functioning system, but the consequence of systemic processes that sought to remove labour from the workplace as an obstacle to extraneous financial goals. The chapter examines the structural transformations of the company which transformed the perceived value of the individual worker and considers the new expulsionary management tactics that characterised the Next restructuring plan. The chapter draws on testimonial material, including suicide letters and witness statements drawn from a legal case taken by a work inspector against the company in 2010 which culminated in the recent criminal trial against the company’s former bosses. An analysis of this testimonial material allows us to reconstruct the causal connections that link structural transformations in the company to the acute suffering that triggered an act of self-killing.
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Waters, Sarah. "Capitalism, Work and Suicide." In Suicide Voices, 25–70. Liverpool University Press, 2020. http://dx.doi.org/10.3828/liverpool/9781789622232.003.0002.

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Chapter one draws on histories of suicide and historical studies of industrial labour in order to examine whether work suicide constitutes a new phenomenon reflecting the historically specific conditions of neoliberalism. Despite the poor material conditions of labour under industrial capitalism, there are few recorded cases of work-related suicide. In 19th century France, suicide was characterised as a marginal phenomenon that affected the most impoverished social groups: the jobless, the destitute or the infirm. The chapter examines the structural transformations that have precipitated a rise of suicides in the workplace and in particular, the shift to a finance-driven economic order. From a source of productivity and therefore profit under industrial capitalism, labour has become, in the contemporary context, an obstacle to rational and extraneous financial goals that needs to be removed. Suicides are the product of differential neoliberal management regimes. On the one hand, suicides affected workers who were pushed to their very limits by management in a bid to increase their individual productivity, economic worth and therefore maximise profits. On the other, suicides affected workers who were pushed out of the workplace as a form of surplus cost.
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Salis, Rita. "The Accident and its Causes: Pseudo-Alexander on Aristotle (Metaphysics Ε3)." In Proceedings of the XXIII World Congress of Philosophy, 297–302. Philosophy Documentation Center, 2018. http://dx.doi.org/10.5840/wcp232018221323.

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Pseudo-Alexander’s commentary in Metaphysics Ε3 is one of the three ancient commentaries which came down to us together with Ascepius’s commentary and Pseudo-Philoponus’s one, in Latin. Pseudo-Alexander’s work, in particular, constitutes the source of interpretation of the Aristotelian text for many modern scholars. In chapter 3 Aristotle shows that there are causes of accidental being, which are generable and destructible without ever being in course of being generated or destroyed. This problem is one of the most difficult and controversial for Aristotle. The thesis is explained by Aristotle with examples concerning past and future events. Pseudo-Alexander considers them as referring to accidental causes. The exegete’s explanation of both cases introduces some elements which are totally extraneous to the Aristotelian text, but nevertheless it could be helpful to cast some light on the understanding of the most controversial passages. In the final passage, Aristotle raises the question of what kind of cause the accident leads to, whether to the material or to the final or to the efficient cause. It is apparently left without an answer. Pseudo-Alexander gives a plausible solution, which is nonetheless probably only partial. The chapter was also examined with reference to the problem of determinism in Aristotle.
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Conference papers on the topic "Extraneous material"

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Choucair, Hassan, and Badih Jawad. "Analyzing Field Failures of Engine Valve Springs in Presence of Non Metallic Inclusions by Applying Statistical and Fracture Mechanics Models." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10060.

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An Engine valve spring, which is made of high strength, clean steel, is a very important component in an engine for controlling the movement of exhaust and the intake valve. It is designed to survive an infinite life under high cyclic stress. Hence, the reliability of engine valve spring is a very important issue from the warranty point of view. The relationship between the stresses applied on the valve spring during operation of an engine and the number of cycles (S-N) curve, is strongly influenced by the presence of inclusions which are microscopic particles of extraneous material within the metal matrix. This implies that the fatigue strength of the material will experience a drop and shift in the endurance and consequently a decrease in the Reliability level of the valve spring. Field and experimental data of engine valve springs failed due to inclusions will be utilized for predicting the fatigue strength of valve spring material by applying extreme value statistics and fracture mechanics models.
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Hartsough, Christopher M., Jingzhe Zhang, Joseph W. Palese, and Sergio DiVentura. "A Method for the Measurement and Efficient Removal of Rail Corrugation for the Subsequent Reestablishment of Profile." In 2017 Joint Rail Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/jrc2017-2253.

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One of the key issues facing rail maintenance crews today is the successful identification and removal of rail corrugations (a sinusoidal, longitudinal rail surface deformation). Typically, rail corrugations are identified through visual inspection (which look for regular surface patterns) or audio methods (which listen for high frequency noise). Once identified, removal is accomplished through rail grinding and consists of running standard “peak-and-plow” grind pattern(s), whereby the corners of the rail are angled upwards to peak the rail, then the top of the rail is ground down (plowed) by placing numerous stones around the top of the rail. “Peak-and-plow” corrugation removal can require multiple passes depending upon the depth of the measured corrugation as well as the type of grinder (available horsepower) and the number of stones present on the grinder being utilized. The above methodology is typically applied whenever corrugation removal is required and since the grind patterns are static, significant extraneous metal removal can occur both during corrugation removal and during rail profiling. An integrated system has been developed to identify and aid in the removal of rail corrugations. To assist in the detection and understanding of the severity of corrugations in the rail, a bogie frame mounted, accelerometer based measurement system was developed. The measured accelerations are filtered and transformed into displacement measurements which can be further processed to understand the primary wavelength and amplitude of the corrugations. These values can then be fed into specialized grinder control software which makes decisions on how to proceed with grinding; be it to remove corrugations then establish profile, only reestablish profile, or do nothing. Note that grinding may still be required to repair the rail surface due to other deformation such as rolling contact fatigue, shelling, spalling, etc. If corrugation removal grinding is required, the specialized software will create (in real-time) dynamic “peak-and-plow” grind patterns utilizing calibrated metal removal equations which estimate the amount of material one grinding stone can remove, based on the instantaneous radius of the rail, grinding motor horsepower, grinder speed, etc. The site specific, dynamic corrugation removal pattern contains calculated motor powers and orientations (angles) which will remove metal from the rails in such a way to both minimize metal removal required to eliminate the corrugations and minimize metal removal when establishing the desired post-grind rail profile. This paper explores recent developments in the identification and subsequent managed removal of rail corrugations with an end goal of the reestablishment of rail profile with minimal metal removal and maximum preservation of rail life. The principal behind the corrugation identification system is described with supporting experimental evidence. Also presented in this paper are the basis behind dynamic corrugation removal, modeling results of applying a dynamic “peak-and-plow” pattern, and a comparative study describing the simulated post-grind outcomes of applying dynamic corrugation removal versus applying traditional methods.
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Iwai, Yasunobu, and Yasuo Imai. "Failure Analysis of Variable Resistor." In ISTFA 2017. ASM International, 2017. http://dx.doi.org/10.31399/asm.cp.istfa2017p0128.

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Abstract Three failed modules were found during routine inspection of industrial equipment after several years of service. We investigated failure causes of them. As a result of the investigation, we show that there are different failure modes for each type of variable resistors (cermet type, carbon composition type, wire wound type). (1)Cermet type: The wiper was unstable because the wiperfixing was weak already during manufacturing. (2)Carbon composition type: The R12 (resistance between #1 and #2 terminals) was unstable because of extraneous materials in manufacturing or zinc whiskers. (3)Wire wound type: The R13 (resistance between #1 and #3 terminals) was broken by the scratch in manufacturing.
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Mehdizadeh, Mohammad, Krishna Oruganti, John Sabu, Michael Bannister, and Israel Herszberg. "Detection of Embedded Damage Growth by Analysing Its Structural Dynamic Response." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1387.

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The primary focus of this paper is to report on the technique developed to extend a simulated damage site (such as a delamination) without inducing other extraneous damage modes. This was done in order to assess the suitability of curvature mode shape analyses in detecting damage types which are similar in type but different in severity or size. This paper highlights the use of vibration based testing on Carbon/Epoxy composite beams for damage detection. Such composites are commonly used in the aerospace and marine industry. The study comprises of testing carbon/epoxy composite beams with various embedded delaminations with a mechanical actuator and a Scanning Laser Vibrometer (SLV) as a sensor for recording the frequency response and the subsequent analyses of the acquired dynamic response based on Displacement and Curvature Mode Shapes. The paper also discusses the Finite Element Method (FEM)-based Analysis to validate the experimental results. In order to assess the effect of an increasing damage zone on a particular damage configuration, it was necessary to extend the damage without inflicting other damage types in the process. This paper reports on an innovative way of extending an existing delamination by a fatigue crack-growth technique. The ASTM E399-90 standard was used for the experiment and a carefully designed fatigue crack growth routine was implemented to advance the delamination in a controlled manner.
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