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Literatura académica sobre el tema "Chemical dating"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 5 de febrero de 2022

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Artículos de revistas sobre el tema "Chemical dating"

Perroud, Hervé, Annick Chauvin y Michel Rebelle. "Hydrocarbon seepage dating through chemical remagnetization". Geological Society, London, Special Publications 98, n.º 1 (1995): 33–41. http://dx.doi.org/10.1144/gsl.sp.1995.098.01.03.

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Spear, Frank S., Joseph M. Pyle y Daniele Cherniak. "Limitations of chemical dating of monazite". Chemical Geology 266, n.º 3-4 (agosto de 2009): 218–30. http://dx.doi.org/10.1016/j.chemgeo.2009.06.007.

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Glover, M. J. y G. F. Phillips. "Chemical methods for the dating of fossils". Journal of Applied Chemistry 15, n.º 12 (4 de mayo de 2007): 570–76. http://dx.doi.org/10.1002/jctb.5010151204.

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Bywater, Robert P. "On dating stages in prebiotic chemical evolution". Naturwissenschaften 99, n.º 3 (15 de febrero de 2012): 167–76. http://dx.doi.org/10.1007/s00114-012-0892-6.

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Kusiak, Monika Agnieszka y Janusz Lekki. "Proton microprobe for chemical dating of monazite". Gondwana Research 14, n.º 4 (diciembre de 2008): 617–23. http://dx.doi.org/10.1016/j.gr.2008.01.011.

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Engi, Martin, Andrij K. Cheburkin y Viktor Köppel. "Nondestructive chemical dating of young monazite using XRF". Chemical Geology 191, n.º 1-3 (noviembre de 2002): 225–41. http://dx.doi.org/10.1016/s0009-2541(02)00158-4.

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Scherrer, Nadim C., Martin Engi, Alfons Berger, Randall R. Parrish y Andriy Cheburkin. "Nondestructive chemical dating of young monazite using XRF". Chemical Geology 191, n.º 1-3 (noviembre de 2002): 243–55. http://dx.doi.org/10.1016/s0009-2541(02)00159-6.

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Cui, Ji-Qiang, Shui-Yuan Yang, Shao-Yong Jiang y Jing Xie. "Multipoint Background Analysis for Chemical Dating of Monazite". Microscopy and Microanalysis 25, S2 (agosto de 2019): 2364–65. http://dx.doi.org/10.1017/s1431927619012558.

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Dunbar, E., G. T. Cook, P. Naysmith, B. G. Tripney y S. Xu. "AMS 14C Dating at the Scottish Universities Environmental Research Centre (SUERC) Radiocarbon Dating Laboratory". Radiocarbon 58, n.º 1 (11 de enero de 2016): 9–23. http://dx.doi.org/10.1017/rdc.2015.2.

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AbstractThis paper describes all the major procedures adopted by the Scottish Universities Environmental Research Centre (SUERC) Radiocarbon Dating Laboratory. This includes sample pretreatment, graphite production, accelerator mass spectrometry (AMS) measurement, associated stable isotope measurements, data handling, and age calculations, but with the main emphasis being on the chemical pretreatment methods. All of the above enable the laboratory to provide a complete analytical service comprising advice on sample selection, preparation and analysis of samples, and Bayesian analysis of resulting 14C (and other) data. This applies to both our research and commercial activities. The pretreatment methods that we mainly focus on are used to remove contaminant carbon from a range of sample types or to isolate a particular chemical fraction from a sample prior to combustion/hydrolysis, graphitization, and subsequent AMS 14C measurement. The methods described are for bone (collagen extraction, with and without ultrafiltration), cremated bone, tooth enamel, charcoal, grain, carbon residues, shell, wood (including alpha-cellulose isolation), peat, sediments, textiles, fuel/biofuel, and forensic samples.

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Churcher, Ian. "Speed dating for reactions". Nature Chemistry 5, n.º 7 (20 de junio de 2013): 554–55. http://dx.doi.org/10.1038/nchem.1689.

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Tesis sobre el tema "Chemical dating"

Scally, Kenneth. "Dating kerosene releases". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/27638/.

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Kerosene is a common fuel for domestic heating systems. Dating petroleum spill contamination is of considerable International Interest. An accurate determination of the age of spills is needed to inform the process of assigning legal and financial responsibility. The pollution of sons and groundwater by kerosene spills is of major concern to householders and their insurers as well as regulators. Released kerosene may persist in the soil as a source of hazardous hydrocarbons for a long time, but not as long as diesel, because of the low solubility and the moderate to low volatility of kerosene constituents. Generally, hydrocarbons in kerosene biodegrade significantly under aerobic conditions provided that sufficient amounts of essential nutrients are present. Extractable petroleum hydrocarbon (EPH) analyses by Jones Environmental laboratories Ltd of soil polluted following kerosene spills were used to develop an empirical model which considered biotic and abiotic factors found at spill sites to determine the time since the kerosene spill.

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Loehn, Clayton William. "Investigation of the monazite chemical dating technique". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/27688.

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In order to evaluate the electron microprobe (EMP) method for chemical dating of monazite, we chemically analyzed selected suites of monazite grains that were previously dated by standard U/Pb isotopic methods at three laboratories each equipped with a sensitive high resolution ion microprobe (SHRIMP). Representing diverse igneous and metamorphic lithologies, these grains yielded conventional isotopic ages ranging in age from Neoarchean to Devonian. Chemical dating was performed at Virginia Tech using a Cameca SX-50 EMP in which the analytical routines and settings were specifically optimized for monazite geochronology, including correction of analytical peaks for all major spectral interferences and correction of peak intensities for local background emission. Placement of cross-grain analytical traverses was based on backscattered electron (BSE) images together with wavelength-dispersive (WD) generated X-ray maps for Y, Th, U, and Ca, which revealed the internal compositional complexity of each grain. Shorter EMP traverses were selected adjacent to each SHRIMP pit in order to provide the best possible comparison of ages obtained by the two dating methods. Synthesis protocol for key elemental measurements (Y, Th, U, and Pb) was developed utilizing the 1Ï elemental errors associated with individual analyses, providing an objective approach for data synthesis. Analytical dates were either accepted or excluded based on analytical and spatial justifications. Isotopic dating techniques utilize three independent age calculations, provided the sample is old enough to have accumulated sufficient 207Pb (i.e., â ¥~1000 Ma). Similarly, the chemical dating method can utilize two independent age calculations (i.e., Th/Pb and U/Pb) and a U-Th-Pbtotal centroid age in Th/Pb vs. U/Pb space, verified independently against the calculated Th* or U* CHIME ages. Across the entire 2,200 m.y. age range represented by the sample set, the chemical ages calculated from the EMP data chemical ages are internally consistent (within 2Ï error) with the previously measured SHRIMP isotopic ages, except in one case where bulk mixing of discrete age domains within an ablation pit led to an isotopically discordant apparent age. Overall, this study illustrates that EMP chemical dating (1) represents both an accurate and precise primary method for dating monazite from igneous and polymetamorphic terrains; (2) provides superior spatial resolution for obtaining meaningful ages from small and/or irregular domains of discrete age that may be irresolvable or misinterpreted by other dating techniques that sample larger volumes; and (3) illuminates the geological meaning of isotopically discordant monazite ages obtained using conventional methods with lower spatial resolution (e.g., SHRIMP).
Ph. D.

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Schmauder, Gretchen C. "Thermal and chemical profiling of the Bald Mountain District, White Pine County, Nevada /". abstract and full text PDF (free order & download UNR users only), 2005. http://0-wwwlib.umi.com.innopac.library.unr.edu/dissertations/fullcit/1433099.

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Thesis (M.S.)--University of Nevada, Reno, 2005.
"August, 2005." Includes bibliographical references. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.

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Shabani, Fouladi Zahra. "Prominent Features In Chemical Stratigraphies From Eastern Wilkes Land, Coastal East Antartica". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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In this work a high resolution data set of ionic composition from a firn core collected at GV7 site (East Antarctica) is presented. An efficient decontamination procedure in cold room and chemical analysis by Ion Chromatography were performed. The most relevant sources delivering aerosol to the Antarctic continent were studied and these results can be pointed out: - as concerning primary marine source (sea salt), a good correlation was found between the main chemical markers related to this input (Na+, Cl-, Mg2+). The highest peaks of sea salt components were found to occur in winter time; - crustal source can be studied through Calcium content and especially its non sea salt fraction (nssCa2+). No clear seasonal pattern was observed in Calcium record at this site; - the markers of secondary marine source (biogenic activity), i.e. Sulfur oxidized compounds (MSA and nssSO42-), show a clear seasonal pattern with concentration maxima in summer, when a large phytoplanktonic bloom occurs in the surrounding ocean causing larger emissions of dimethylsulfide; - NO3- was found not to be affected here by post-depositional effects, that are able to modify its concentration in low accumulation sites. Moreover, thanks to the relatively high accumulation rate at GV7, it was possible to achieve an accurate dating of the core, by counting successive annual snow layers, marked by those parameters presenting a clear seasonal trend along the stratigraphy, or by the presence of specific dated events such as documented volcanic eruptions. nssSO42- was chosen for dating purpose, by using its maxima occurring in full summer period and, starting from the surface, 26 summer peaks were identified along the whole GV7 core. These preliminary results appear to be promising for the obtainment of a record at high temporal resolution on the climatic variability in the last millennium by the chemical and isotopic analysis of the 250 m deep ice core drilled in this site.

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Goodfellow, Bradley W. "Relict non-glacial surfaces and autochthonous blockfields in the northern Swedish mountains". Doctoral thesis, Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm university, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7544.

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Santosh, M. "The birth of Gondwana : Timing and thermal spikes constrained from chemical dating of monazites(Proceedings of the 19^ Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2006,Part1)". 名古屋大学年代測定資料研究センター, 2007. http://hdl.handle.net/2237/13669.

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第19回名古屋大学年代測定総合研究センターシンポジウム平成18(2006)年度報告<第1部> Proceedings of the 19th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research in 2006 日時:平成19 (2007)年1月15日(月)～17日(水) 会場:名古屋大学シンポジオン Date:January15th-17th, 2007 Venue:Nagoya Uhiversity Symposion Hall

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Rajmanickam, Vijayaraj, Hema Achyuthan, Christopher Eastoe y Anjum Farooqui. "Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India: Geochemistry and palynology". SAGE PUBLICATIONS LTD, 2017. http://hdl.handle.net/10150/624066.

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The Kukkal basin, Tamil Nadu, India, receives most of its rain from the southwest monsoon (SWM). A sediment core from Kukkal Lake preserves a continuous sediment record from the early-Holocene to present (9000 yr BP to present). The present lake is situated at an elevation of similar to 1887m a.s.l., in a small basin that appears to have alternated between a and wetland depositional environment. Climate proxies, including sediment texture, total organic carbon (TOC), total nitrogen (TN), C/N, pollen and geochemical composition indicate a steady progression to wetter conditions, with two stepwise changes at about 8000, and between 3200 and 1800 yr BP. The change at 8000 yr BP appears to correspond to a brief (100-150years) dry spell recorded elsewhere in India. The change at 3200-1800 yr BP consisted in a rapid intensification of the SWM, and may correlate with the initiation of the Roman Warm Period'. There is no clear evidence of changes at the times of the Medieval Warm Period' (MWP') and the Little Ice Age' (LIA'). The C/N ratio of the sediments ranges from 14.02 to 8.31, indicating that the organic matter originated from a mixture of lacustrine algae, vascular and terrestrial plants. Chemical weathering indices (Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), and Plagioclase Index of Alteration (PIA)) are consistent with extreme silicate weathering. Pollen data show a development from savanna vegetation prior to about 8000 yr BP, followed by grassland with palms, the appearance of ferns just prior to 3200 yr BP and the establishment of the tropical humid forest between 3200 and about 1800 yr BP.

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Warkus, Friederike C. "Untersuchungen an Hochdruckrelikten im zentralen Menderes Massiv, W Türkei". Phd thesis, Universität Potsdam, 2001. http://opus.kobv.de/ubp/volltexte/2005/28/.

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Das Menderes Massiv im Westen der Türkei stellt eine große Kulmination metamorpher Gesteine dar. Das Untersuchungsgebiet ist im Zentralen Menderes Massiv (Ödemis Submassiv) gelegen, das von den beiden aktiven Gräben, dem Gediz Graben im Norden und dem Büyük Menderes Graben im Süden begrenzt wird.
Die Untersuchungen der Eklogit Relikte im zentralen Menderes Massiv haben ergeben, dass sich im Menderes Massiv Hochdruckrelikte in unterschiedlichen tektonischen Positionen befinden. Zum einen existieren Eklogit-Blöcke in der obersten Einheit (Selcuk Einheit) des zentralen Menderes Massivs und zum anderen Hochdruck-Relikte in der strukturell mittleren Birgi - Tire Decke. Die Granate der quarzfreien Eklogit-Blöcke weisen große Ähnlichkeiten mit denen der HP/LT Gesteine von Sifnos und Syros auf. Die Entwicklung der Eklogit-Blöcke in der Olistostrom-Einheit lässt sich jedoch nicht mit den Eklogit Relikten in der strukturell mittleren Birgi Tire Decke vergleichen.
Für die Eklogit-Relikte in der Birgi Tire Decke wurde eine polymetamorphe Entwicklung mithilfe petrologischer Untersuchungen und chemischen und Pb-Pb Datierungen herausgearbeitet. Die Eklogit Relikte gehören zu einem metamorphen Teilpfad, der durch eine Amphibolitfazies 1 - Hochdruck - Amphibolitfazies 2/Granulitfazies charakterisiert ist. Der Endpunkt dieses Teilpfades ist mit Temperaturen zwischen 700 und 750 °C und Drücken von 1.2 - 1.4 GPa belegt. Für diese Bedingungen konnte ein minimales Alter von 520 Ma durch chemische Datierungen an Monaziten einer Augengneisprobe und Pb-Pb Datierungen an Zirkonen einer Augengneis- und Metagabbroprobe bestimmt werden. Dieser amphibolit/granulitfazieller Endpunkt wird mit den Granitintrusionen des zentralen und südlichen Menderes Massiv korreliert, die in einem Zeitraum zwischen 520 Ma bis 550 Ma stattfanden.
Sowohl die Amphibolitfazies 1 als auch das Hochdruckereignis werden der Panafrikanischen Orogenese zugeordnet. Für die Hochdruckbedingungen wurden maximale Temperaturen zwischen 680°C und 720°C und bei einem Druck von 2.2 GPa bestimmt. In den untersuchten Metasedimenten konnte eine prograde metamorphe Entwicklung abgeleitet werden, die amphibolitfazielle Bedingungen von 660°C bei 0.6 GPa erreichte. Das Metamorphosealter dieser Metasedimente konnte mit < 100 Ma mittels chemischer Mikrosondendatierung bestimmt werden. Die in den Metasedimenten herausgearbeiteten Druck- und Temperaturbedingungen wurden ebenfalls in den metabasischen Gesteinen bestimmt. Diese Ergebnisse werden als Krustenstapelung der metabasischen Gesteine, Augengneise und Metasedimente interpretiert, die mit der alpinen Orogenese im Zusammenhang stehen.
Durch die Ergebnisse dieser Arbeit lässt sich die Birgi-Tire Decke im zentralen Menderes Massiv genauer charakterisieren. Sie besteht aus Metasedimenten, pelitischen Gneisen, Augengneisen und metabasichen Gesteinen. Die Gneise (pelitische und Augengneise) und die metabasischen Gesteine stellen panafrikanische Relikte dar, die einen amphibolit- eklogit- amphibolit/granulitfaziellen Metamorphosepfad gespeichert haben. Die amphibolit- bis granulitfazielle Metamorphose hängt mit den Granitintrusionen zusammen und fand in einem Zeitraum zwischen 520 - 550 Ma statt. Große Teile der Metasedimente der Birgi Tire Decke haben jedoch nur eine alpine metamorphe Entwicklung durchlaufen, wo sie unter amphibolitfazielle Bedingungen Krustentiefen erreichten, bei denen sie mit den panafrikanischen Relikten zusammen gestapelt wurden und eine gemeinsame Exhumierung erfahren haben.
The Menderes Massif in western Turkey is a large culmination of metamorphic rocks. The investigation area is bounded by two active graben systems, the Gediz Graben in the north and the Büyük Menderes Graben in the south. One result of our investigation in the central Menderes Massif is the occurrence of eclogite relicts in different tectonic positions. On one hand eclogite blocks exist in the structurally highest nappe (Selcuk unit) of the central Menderes Massif, and on the other hand the high pressure relicts exist in the structurally middle Birgi-Tire nappe. The garnets of the quartz-free eclogite blocks in a metaolistostrome unit show large similarities with those which indicate the HP/LT rocks of Sifnos and Syros. The occurrence of the eclogite blocks in the metaolistostrome unit can not be correlated with those of the structural middle nappe (Birgi Tire nappe). By petrological investigations, chemical and Pb-Pb age determinations a polymetamorphic history was found for the eclogite relicts in the Birgi Tire nappe. The eclogite relicts belong to a metamorphic P-T path which is characterized by a amphibolite facies 1 - high pressure - amphibolite facies 2/granulite facies. The last one is characterized by temperatures between 700 and 750 °C and by pressure of 1.2 - 1.4 GPa. A minimum age of 520 Ma was deduced by chemical age determination on monazites and Pb-Pb dating on zircons. The age of the amphibolite/granulite facies condition is correlated with the granite intrusions in the central and southern Menderes Massif which occurred in the range of 520 to 550 Ma. The intrusions belong to the Panafrican orogeny. Therefore the P-T path (amphibolite facies 1 - high pressure - amphibolite facies 2/granulite facies) is assigned to the Panafrican orogeny. The maximum temperatures of the high pressure event are between 680 °C and 720 °C. The pressure amounts to 2.2 GPa. A prograde metamorphic evolution under amphibolite facies conditions was derived for the investigated metasediments. The amphibolite facies conditions took place at a temperature of 660°C and at a pressure of 0.6 GPa. The age of the metasediments was determined as < 100 Ma by means of chemical dating. The same metamorphic conditions could be recognized in the metabasic rocks. The interpretation of this result is that crustal stacking occurred under amphibolite facies conditions during the Alpine orogeny. Due to the presented results, the Birgi Tire nappe in the central Menderes Massif can be characterized more exactly. It consists of metasediments, pelitic and augengneisses, and metabasic rocks. Pelitic and augengneisses and the metabasic rocks represent Panafrican relicts, which have stored an amphibolite - eclogite - amphibolite/granulite facies P-T path. The amphibolite to granulite facies metamorphosis is related to the granite intrusions and took place in a period between 520 - 550 Ma. Parts of the metasediments belonging to the Birgi Tire nappe are influenced by only an alpine metamorphic history. They moved to crustal depths at which they were stacked with the Panafrican relicts under amphibolite facies conditions followed by common exhumation.

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Brown, Stacy. "Beyond-Use Dating of Lidocaine Alone and in Two “Magic Mouthwash” Preparations". Digital Commons @ East Tennessee State University, 2017. https://doi.org/10.2146/ajhp160214.

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Purpose: Beyond-use dating (BUD) of lidocaine alone and in two “magic mouthwash” preparations stored in amber oral syringes at room temperature was determined. Methods:Two formulations of mouthwash containing oral topical lidocaine 2% (viscous), diphenhydramine 2.5 mg/mL, and aluminum hydroxide–magnesium hydroxide–simethicone were prepared in 1:1:1 and 1:2.5:2.5 ratios, divided into 3-mL samples, and stored in unit-dose oral amber syringes. Unit-dose single-product lidocaine samples were also prepared to serve as controls and stored in oral amber syringes. The lidocaine concentrations in these samples were measured periodically for 90 days. A stability-indicating high-performance liquid chromatographic method was developed and validated for system suitability, accuracy, repeatability, intermediate precision, specificity, linearity, and robustness. Results: Based on the calculated percentages versus the initial concentration and the results from an analysis of variance comparing the two formulations, a BUD of 21 days is deemed appropriate for both magic mouthwash formulations. Based on the stability data, published safety concerns, and lack of efficacy in combination, packaging and dispensing lidocaine separately from other ingredients are recommended when administering magic mouthwash mixtures. Utilizing a 90-day BUD, lidocaine can be packaged separately from other magic mouthwash ingredients in individual dosage units and applied to the oral cavity using the swish-and-spit method. The delivery of the diphenhydramine and aluminum hydroxide–magnesium hydroxide–simethicone could be separated, allowing for a swish-and-swallow method of administration.Conclusion: A BUD of 21 days is recommended for lidocaine prepared with diphenhydramine and aluminum hydroxide–magnesium hydroxide–simethicone in ratios of 1:1:1 and 1:2.5:2.5 and stored at room temperature in amber oral plastic syringes.

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Cros, Alexandre. "Influence des propriétés cristallochimiques de la calcite sur la diffusion de l'hélium et essai de datation (U-Th-Sm)/He de calcite filonienne et de remplissage de brèche". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00719709.

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La datation des carbonates est un enjeu important en géosciences car ces minéraux sont présents dans tous les grands cycles superficiels terrestres. Actuellement, l'âge de formation des cristaux de calcite de failles peut être déterminé par la méthode de déséquilibre U-Th ou par la méthode U-Pb. La potentialité de la méthode (U-Th-Sm)/He a été envisagée à partir des premiers résultats de diffusion de l'hélium dans les carbonates (Copeland et al. 2007) qui montrent que l'hélium est rétentif à basse température, inférieure à 70°C. Le développement de cette méthode nécessite une identification des propriétés cristallochimiques et du comportement de la calcite afin de discuter la validité des âges obtenus. Une zone de déformation au contact d'une faille normale du fossé d'effondrement de Gondrecourt à Augeville (Est du bassin de Paris) et des cristaux de calcite géodique des argilites de Tournemire (Aveyron) ont été étudiés. Une étude pétrographique et géochimique (analyse des isotopes stables δ18O et δ13C et des éléments mineurs et traces) a permis d'identifier les phases de remplissage de la zone de déformation d'Augeville. Sur les phases de remplissages une étude cristallographique par DRX (diffraction des rayons X) et ATG (analyse thermogravimétrique) a permis d'identifier les propriétés mécaniques de la calcite à différentes températures. Des expériences de diffusion de l'hélium ont été conduites selon un protocole différent de celui de Copeland et al. (2007) : temps de chauffage inférieur à 12 heures au lieu de paliers de chauffage de plusieurs heures à semaines. Des datations (U-Th-Sm)/He ont été réalisées sur toutes les phases de remplissage de la zone de déformation ainsi que sur les cristaux géodiques de Tournemire. Les résultats pour Gondrecourt mettent en évidence une zone de déformation à remplissage calcitique pluriphasée qui marque chaque étape de l'évolution tectonique de la zone. Il s'agit majoritairement de remplissages de brèches hydrauliques à brèches chaotiques avec, pour finir, la mise en place de filons. Sur ces minéralisations les résultats cristallochimiques montrent que lorsqu'ils sont soumis à une température croissante, de température ambiante à 400°C, ou sur le long terme à 200°C, il y a un accroissement du nombre de microfissures qui aboutit à la formation de clivage. L'évolution cristallochimique sous l'effet de la température présente des modifications structurales pour chacune des phases étudiées. Les expériences de diffusion dépendent de ces microfissures et de cette évolution microstructurale. Ces résultats mettent en évidence les mécanismes de diffusion de l'hélium dans la calcite à travers de multiples domaines de diffusion différents de la taille du grain. Ces domaines de diffusion dépendent de l'état microstructural de l'échantillon. Les résultats de datation (U-Th-Sm)/He présentent une large dispersion de 0,1 Ma à 35 Ma pour la zone de déformation de Gondrecourt et de 0,4 Ma à 20 Ma pour les cristaux géodiques de Tournemire. La variation des âges est en partie liée à la position des cristaux de calcite dans la succession paragénétique qui entraine un continuum de fracturation qui génère de multiples domaines de diffusion dans les cristaux de calcite.

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Libros sobre el tema "Chemical dating"

1947-, Schleicher Helmut, ed. Absolute age determination: Physical and chemical dating methods and their application. Berlin: Springer-Verlag, 1990.

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Age determination of young rocks and artifacts: Physical and chemical clocks in Quaternary geology and archaeology. Berlin: Springer, 1998.

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Kabirullah, M. Chemical changes in food grains in government storage. Dhaka: Food Management & Research Support Project, Ministry of Food, Government of the People's Republic of Bangladesh, 2001.

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Binder, Harry H. Lexikon der chemischen Elemente: Das Periodensystem in Fakten, Zahlen und Daten. Stuttgart: S. Hirzel, 1999.

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1922-, Charalambous George, ed. Shelf life studies of foods and beverages: Chemical, biological, physical, and nutritional aspects. Amsterdam: Elsevier, 1993.

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S, Stuckless John, ed. Chemical and isotopic studies of granitic Archean rocks, Owl Creek Mountains, Wyoming. Washington: U.S. G.P.O., 1986.

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M, Eskin N. A. y Robinson David S. 1935-, eds. Food shelf life stability: Chemical, biochemical, and microbiological changes. Boca Raton, Fla: CRC Press, 2001.

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Michael N. A. Eskin (Editor) y David S. Robinson (Editor), eds. Food Shelf Life Stability: Chemical, Biochemical, and Microbiological Changes (Crc Series in Contemporary Food Science). CRC, 2000.

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1922-, Charalambous George, ed. Handbook of food and beverage stability: Chemical, biochemical, microbiological, and nutritional aspects. Orlando: Academic Press, 1986.

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Summary of chemical analyses and ⁴⁰Ar/³⁹Ar age-spectra data for Eocene volcanic rocks from the central part of the northeast Nevada volcanic field. Washington: U.S. G.P.O., 1995.

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Capítulos de libros sobre el tema "Chemical dating"

Geyh, Mebus A. y Helmut Schleicher. "Chemical Dating Methods". En Absolute Age Determination, 345–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-74826-4_8.

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Burgess, David. "Dating Techniques". En Chemical Science and Conservation, 82–87. London: Macmillan Education UK, 1990. http://dx.doi.org/10.1007/978-1-349-11429-0_7.

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Dosseto, Anthony. "Chemical Weathering (U-Series)". En Encyclopedia of Scientific Dating Methods, 1–28. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_246-1.

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Dosseto, Anthony. "Chemical Weathering (U-Series)". En Encyclopedia of Scientific Dating Methods, 152–69. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_246.

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Suzuki, Kazuhiro y Daniel J. Dunkley. "Uranium-Lead, Chemical Isochron U-Pb Method (CHIME)". En Encyclopedia of Scientific Dating Methods, 1–9. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_200-1.

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Suzuki, Kazuhiro y Daniel J. Dunkley. "Uranium–Lead, Chemical Isochron U–Pb Method (CHIME)". En Encyclopedia of Scientific Dating Methods, 863–69. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_200.

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Fontes, Jean-Charles. "Chemical and Isotopic Constraints on 14C Dating of Groundwater". En Radiocarbon After Four Decades, 242–61. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4757-4249-7_17.

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Francese, Simona y Robert Bradshaw. "New Chemical Imaging Approaches to Fingermark Dating by Mass Spectrometry". En Technologies for Fingermark Age Estimations: A Step Forward, 237–59. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69337-4_8.

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Armitage, Ruth Ann, Mary Ellen Ellis y Carolynne Merrell. "New Developments in the “Nondestructive” Dating of Perishable Artifacts Using Plasma-Chemical Oxidation". En ACS Symposium Series, 143–54. Washington, DC: American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1103.ch008.

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Parnell, J. "Chemical Age Dating of Hydrocarbon Migration Using Uraniferous Bitumens, Czech-Polish Border Region". En Bitumens in Ore Deposits, 510–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85806-2_28.

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Actas de conferencias sobre el tema "Chemical dating"

Trafela, T., M. Mizuno, K. Fukunaga y M. Strlic. "THz spectroscopy and chemometrics for quantitative determination of chemical properties and dating of historic paper". En 2010 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010). IEEE, 2010. http://dx.doi.org/10.1109/icimw.2010.5612350.

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Preece, Dale S., Jerome H. Stofleth, David L. Cole y Paul W. Cooper. "Design of Conical Shaped Charges for Prompt Initiation of TNT Chemical Munition Bursters". En ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1151.

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The Explosive Destruction System (EDS) has been designed at Sandia National Laboratories for the disposal of chemical munitions (phosgene, mustard gas, sarin etc.), many dating back to World War I. EDS is a portable system that is trailer mounted and consists of a vessel into which a chemical munition can be loaded and neutralized with linear and conical shaped charges. Gases are contained within the sealed chamber. The linear shaped charges split the munition in two and the conical is aimed at the explosive burster, in each munition, which is detonated by the shaped charge jet. Toxic chemicals remaining in the vessel following detonation are neutralized and disposed of. This paper documents the development of a new conical shaped charge (CSC) needed to reliably detonate explosive bursters in an expanding array of chemical munitions that are beyond what the device was originally designed to neutralize. Design of this new CSC was controlled by the need to deliver energy above the detonation threshold into the explosive after penetrating the outer steel casing, fluid, the burster casing and finally the explosive. Design considerations were driven by jet conditions at the steel/explosive interface inside the burster. Parameters to consider in CSC design include: 1) diameter, 2) liner thickness, 3) liner position in body, 4) explosive weight, and 5) liner shape or interior angle. The effects of these parameters on final CSC performance are examined in detail. CSC’s meeting the design specifications have been manufactured and tested. The performance of these charges is compared with the original design requirements.

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Fedotov, A. "ВОЗРАСТ ОСАДОЧНЫХ РАЗРЕЗОВ СОВРЕМЕННЫХ ОЗЕР ЮЖНОЙ ЧАСТИ ВОСТОЧНОЙ СИБИРИ И ВОПРОСЫ ПАЛЕОРЕКОНСТРУКЦИЙ". En Радиоуглерод в археологии и палеоэкологии: прошлое, настоящее, будущее. Материалы международной конференции, посвященной 80-летию старшего научного сотрудника ИИМК РАН, кандидата химических наук Ганны Ивановны Зайцевой. Samara State University of Social Sciences and Education, 2020. http://dx.doi.org/10.31600/978-5-91867-213-6-101-102.

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Bottom sediments of some small modern lakes located at the Khamar-Daban and Kodar Ridge (East Siberia) were investigated by 14C dating, chemical and biological methods. Graphitization and AMS-analysis were carried out in the laboratory AMS Golden Valley using AMS constructed at Budker Institute of Nuclear Physics (Novosibirsk, Russia). Depth-age model and paleo-proxies evidenced that studied lakes began form since ca.12 ka cal. BP, and there were hiatuses in lacustrine sedimentation at ca. 18–22 and 5 ka cal. BP.

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Andreiev, A. "Perspectives Of Chemical Isochrone Method Of Dating (Chime) For The Rb-Sr System Of A Potassium Minerals Based On Xrf". En 12th International Conference on Monitoring of Geological Processes and Ecological Condition of the Environment. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201803141.

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Sande, Timothy D., Gilbert L. Zigler, Ernie J. Kee, Bruce C. Letellier, C. Rick Grantom y Zahra Mohaghegh. "The Benefits of Using a Risk-Informed Approach to Resolving GSI-191". En 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54604.

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The emergency core cooling system (ECCS) and containment spray system (CSS) in a pressurized water reactor (PWR) are designed to safely shutdown the plant following a loss of coolant accident (LOCA). The assurance of long term core cooling in PWRs following a LOCA has a long history dating back to the NRC studies of the mid 1980s associated with Unresolved Safety Issue (USI) A-43. Results of the NRC research on boiling water reactor (BWR) ECCS suction strainer blockage of the early 1990s identified new phenomena and failure modes that were not considered in the resolution of USI A-43. As a result of these concerns, Generic Safety Issue (GSI) 191 was identified in September 1996 related to debris clogging of the ECCS sump suction strainers at PWRs. Although plants have taken steps to prevent strainer clogging (by increasing the screen area, for example), satisfactory closure of this issue has proved elusive due to long term cooling issues and the effect of chemical precipitates on head loss. Previous investigators have identified bounding scenarios using conservative inputs, methods, and acceptance criteria. The acceptance criteria are applied in a “pass/fail” fashion that ignores risk. That is, if the results are acceptable, the issue has been resolved. Otherwise, it is necessary to either redo the analysis with partial relaxation of analytical conservatisms or perform additional plant modifications to ensure that the acceptance criteria are met. This article describes a new approach to close out the GSI-191 issue by evaluating the risk associated with ECCS performance on post-LOCA core cooling as a basis to change the plant license. The approach includes an assessment of LOCA frequencies as a function of break size at locations along the reactor coolant system, as well as a full quantification of the uncertainties associated with LOCA frequencies and the generation, transport, accumulation, and subsequent impact of debris on ECCS performance. The overall frameworks for the deterministic and risk-informed approaches are summarized with emphasis on the risk-informed method. The differences between the deterministic approach taken in the past and the new risk-informed approach are described. Advantages and disadvantages between the two methods are described and contrasted for the GSI-191 issue. The South Texas Project (STP) GSI-191 risk-informed closure efforts are presented.

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