Relevant bibliographies by topics / Lithic substrate

Academic literature on the topic 'Lithic substrate'

Author: Grafiati
Published: 10 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Lithic substrate.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Lithic substrate"

1

Casero, María Cristina, Victoria Meslier, Jocelyne DiRuggiero, Antonio Quesada, Carmen Ascaso, Octavio Artieda, Tomasz Kowaluk, and Jacek Wierzchos. "The composition of endolithic communities in gypcrete is determined by the specific microhabitat architecture." Biogeosciences 18, no. 3 (February 10, 2021): 993–1007. http://dx.doi.org/10.5194/bg-18-993-2021.

Full text
Abstract:
Abstract. Endolithic microhabitats have been described as the last refuge for life in arid and hyper-arid deserts where life has to deal with harsh environmental conditions. A number of rock substrates from the hyper-arid Atacama Desert, colonized by endolithic microbial communities such as halite, gypsum crusts, gypcrete, calcite, granite and ignimbrite, have been characterized and compared using different approaches. In this work, three different endolithic microhabitats are described, each one with a particular origin and architecture, found within a lithic substrate known as gypcrete. Gypcrete, an evaporitic rock mainly composed of gypsum (CaSO4 ⋅ 2H2O) and collected in the Cordón de Lila area of the desert (Preandean Atacama Desert), was found to harbour cryptoendolithic (within pore spaces in the rock), chasmoendolithic (within cracks and fissures) and hypoendolithic (within microcave-like pores in the bottom layer of rock) microhabitats. A combination of microscopy investigation and high-throughput sequencing approaches were used to characterize the endolithic communities and their habitats at the microscale within the same piece of gypcrete. Microscopy techniques revealed differences in the architecture of the endolithic microhabitats and the distribution of the microorganisms within those microhabitats. Cyanobacteria and Proteobacteria were dominant in the endolithic communities, of which the hypoendolithic community was the least diverse and hosted unique taxa, as a result of less access to sun radiation. These results show, for the first time, that the differences in the architecture of a microhabitat, even within the same piece of a lithic substrate, play an essential role in shaping the diversity and composition of endolithic microbial communities.
APA, Harvard, Vancouver, ISO, and other styles
2

McBrearty, Sally, Laura Bishop, Thomas Plummer, Robert Dewar, and Nicholas Conard. "Tools Underfoot: Human Trampling as an Agent of Lithic Artifact Edge Modification." American Antiquity 63, no. 1 (January 1998): 108–29. http://dx.doi.org/10.2307/2694779.

Full text
Abstract:
A series of eight replication experiments tests the proposition that human trampling of stone flakes can produce edge damage that mimics deliberate retouch. Retouchlike edge damage, breakage, and other forms of macroscopic mechanical damage were observed on large numbers of pieces in all trampled sets. Experiments measured the relative contributions of three variables-raw material, artifact density, and substrate-in generating damage. Results indicate that while all three factors contribute to some degree, substrate plays the most decisive role, and that artifacts are more likely to exhibit damage if trampled on an impenetrable substrate. It was further found that trampling transforms flakes into pseudo-tools that can be classified as formal tools using a standard typology. Many of these are notched and denticulate pieces, indicating that special caution is needed in behavioral interpretations based on these tool types, and that the European Paleolithic Denticulate Mousterian industry requires critical reassessment.
APA, Harvard, Vancouver, ISO, and other styles
3

Shipway, J. Reuben, Marvin A. Altamia, Gary Rosenberg, Gisela P. Concepcion, Margo G. Haygood, and Daniel L. Distel. "A rock-boring and rock-ingesting freshwater bivalve (shipworm) from the Philippines." Proceedings of the Royal Society B: Biological Sciences 286, no. 1905 (June 19, 2019): 20190434. http://dx.doi.org/10.1098/rspb.2019.0434.

Full text
Abstract:
Shipworms are a group of wood-boring and wood-feeding bivalves of extraordinary economic, ecological and historical importance. Known in the literature since the fourth century BC, shipworms are both destructive pests and critical providers of ecosystem services. All previously described shipworms are obligate wood-borers, completing all or part of their life cycle in wood and most are thought to use wood as a primary source of nutrition. Here, we report and describe a new anatomically and morphologically divergent species of shipworm that bores in carbonate limestone rather than in woody substrates and lacks adaptations associated with wood-boring and wood digestion. The species is highly unusual in that it bores by ingesting rock and is among the very few known freshwater rock-boring macrobioeroders. The calcareous burrow linings of this species resemble fossil borings normally associated with bivalve bioerosion of wood substrates (ichnospecies Teredolites longissimus ) in marginal and fully marine settings. The occurrence of this newly recognized shipworm in a lithic substrate has implications for teredinid phylogeny and evolution, and interpreting palaeoenvironmental conditions based on fossil bioerosion features.
APA, Harvard, Vancouver, ISO, and other styles
4

Roche, Olivier. "Nature and velocity of pyroclastic density currents inferred from models of entrainment of substrate lithic clasts." Earth and Planetary Science Letters 418 (May 2015): 115–25. http://dx.doi.org/10.1016/j.epsl.2015.03.001.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Gifford-Gonzalez, Diane P., David B. Damrosch, Debra R. Damrosch, John Pryor, and Robert L. Thunen. "The Third Dimension in Site Structure: An Experiment in Trampling and Vertical Dispersal." American Antiquity 50, no. 4 (October 1985): 803–18. http://dx.doi.org/10.2307/280169.

Full text
Abstract:
AbstractTwo measured and weighed assemblages of lithic debitage were subjected to human treadage, one set on a compact sandy silt (“loam”) substrate, the other on unconsolidated sand. The assemblages were excavated, plotted in three dimensions, and documented for damage. Downward migration of pieces at the loam site was minimal: fracture of small pieces was the dominant damage pattern. Most sand site pieces migrated to 3-8 cm depth; vertical distribution of pieces approximated a normal curve, and edge-damage to larger pieces was the dominant damage pattern. Vertical distribution of artifacts at the sand site approximated a pattern observed in two other trampling experiments and a number of archaeological occurrences. Factors influencing these distributions are discussed.
APA, Harvard, Vancouver, ISO, and other styles
6

Smith, Ru D. A., and Andrew J. Ross. "Amberground pholadid bivalve borings and inclusions in Burmese amber: implications for proximity of resin-producing forests to brackish waters, and the age of the amber." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 107, no. 2-3 (June 2016): 239–47. http://dx.doi.org/10.1017/s1755691017000287.

Full text
Abstract:
ABSTRACTClavate (club-shaped) structures rimming mid-Cretaceous Burmese amber from Myanmar, previously misdiagnosed as fungal sporocarps, are shown to be domichnia (crypts) of martesiine bivalves (Pholadidae: Martesiinae). They are similar in form to Teredolites clavatus Leymerie, 1842 and Gastrochaenolites lapidicus Kelly & Bromley, 1984; however, the former identification is preferable, given that they are martesiine crypts in amber as opposed to a lithic substrate. Cross-cutting relationships between the clavate features and inclusions in the amber demonstrate that the features post-date hardening of the resin. The fills of the crypts are variable, including sand grade sediment of very fine to coarse sand grainsize, and sparry calcite cements. In some cases, the articulated valves of the pholadid bivalve responsible are visible inside the borings. However, one remarkable specimen contains two pairs of articulated shells ‘floating’ in amber, not associated with crypts; an observation that suggests that the resin was still liquid or soft when the bivalves were trapped in the resin. One individual is associated with an irregular sediment-filled feature and shows shell breakage. Formation of a solid rim around a liquid central volume has been documented in subaqueous bodies of resin in modern swamp forests, and argues for a close proximity between the amber-producing trees and a brackish water habitat for the bivalves. The presence of pyrite as thin films and crystal groups within Burmese amber is further consistent with such a depositional environment. Comparison of the size of pholadid body fossils with growth rates of modern equivalents allows the duration of boring activities to be estimated and suggests that small fossil pholadids in Burmese amber became trapped and died within 1–2 weeks of having settled on the resin. Larger examples present within well-formed domichnia formed in hardened resin. Since ‘hardground’ describes early lithified sediment as a substrate and ‘woodground’ describes wood as a substrate, the term ‘amberground’ is used here to described borings in an amber substrate.
APA, Harvard, Vancouver, ISO, and other styles
7

Koski, Randolph A. "Ferromanganese deposits from the Gulf of Alaska Seamount Province: mineralogy, chemistry, and origin." Canadian Journal of Earth Sciences 25, no. 1 (January 1, 1988): 116–33. http://dx.doi.org/10.1139/e88-012.

Full text
Abstract:
Ferromanganese-oxide deposits dredged from four seamounts (Welker, Miller, Murray, and Patton) in the Gulf of Alaska Seamount Province include poorly crystallized microlaminated crusts on basalt substrate, well-crystallized Mn-oxide veins in epiclastic sedimentary rocks, and crystalline Mn-oxide layers and micronodules in phosphorite. The principal rock types dredged are alkali-basalt pillow fragments and tuffaceous conglomerate and sandstone. The glassy rims of pillow fragments, the glassy goundmass of large volcanic clasts, and the tuffaceous component of the sediment are altered to palagonite. Other low-temperature alteration products include phillipsite, smectite, and carbonate-apatite.Thick (10–50 mm) Fe–Mn crusts consist mainly of δ-MnO2; straight and cuspate growth laminae indicate variable growth rates and periods of nondeposition. A larger number of detrital particles toward the top of thick crusts record the increasing influence of active volcanoes of the Aleutian arc during northwestward movement of the Pacific plate. Thick crusts on basalt substrate have higher Mn/Fe ratios and lower Co content than Fe–Mn crusts from low-latitude seamounts of the central Pacific region. Thin (< 10 mm) crusts on volcaniclastic substrate contain todorokite and birnessite and have higher Mn/Fe ratios, Ni, and Cu and lower Fe and Co than thick Gulf of Alaska crusts.Veins of todorokite and cryptomelane with complex internal structure occur in altered tuffaceous sandstone and conglomerate from Miller Seamount. Fibrous todorokite has a composition similar to those of other marine examples but may contain up to 7% Mn2+ in M2 sites. Microprobe analysis of the marine cryptomelane indicates a composition that is approximately (K,Ba)1–2(Mn4+,Co)7–8O16∙x(H2O).A third type of Fe–Mn deposit in phosphorite is an intimate mixture of todorokite (and minor δ-MnO2)-bearing layers and micronodules, carbonate-apatite, and phillipsite that encloses grains of altered volcanic glass and lithic fragments.The microlaminated structure, mineralogy (predominantly δ-MnO2), and composition (Mn/Fe ratio and transition metal, rare earth element, U, and Th contents) of the thick crusts are characteristic of hydrogenetic Fe–Mn crusts elsewhere in the Pacific. Conversely, the crystallinity and chemical composition of the Mn-oxide veins and thin crusts indicate formation during diagenesis of the volcanogenic sediment substrate. Mn and other transition metals are mobilized during low-temperature oxidative alteration (palagonitization) of basaltic volcanic glass; the oxidation of Fe2+ to Fe3+ during palagonitization and the dissolution of the dilute biogenic fraction of the sediment combine to lower the Eh of ambient pore fluid and enhance the mobility of Mn2+. Diagenesis in the phosphatic sandstone from Patton Seamount involves organic-rich sediment and pore waters elevated in phosphorus owing to upwelling above a large volcanic edifice.
APA, Harvard, Vancouver, ISO, and other styles
8

McPherron, Shannon P., David R. Braun, Tamara Dogandžić, Will Archer, Dawit Desta, and Sam C. Lin. "An experimental assessment of the influences on edge damage to lithic artifacts: a consideration of edge angle, substrate grain size, raw material properties, and exposed face." Journal of Archaeological Science 49 (September 2014): 70–82. http://dx.doi.org/10.1016/j.jas.2014.04.003.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Anderson, Dennis S., and Ronald B. Davis. "The vegetation and its environments in Maine peatlands." Canadian Journal of Botany 75, no. 10 (October 1, 1997): 1785–805. http://dx.doi.org/10.1139/b97-893.

Full text
Abstract:
This study is based on relevés from 96 peatlands representing the typologic, environmental, and geographic variation of Maine peatlands, and on peat pore-water chemistry at a representative set of 51 of these peatlands. We give optima and tolerances of pH, Ca, P, NO3-N, NH4-N, and influence of upper on lower vegetational strata for the 73 most common vascular plant species, excluding sedges, which are presented elsewhere. The program TWINSPAN differentiated 30 plant communities. Environments of the first seven TWINSPAN divisions differed largely by Ca, pH, P, NH4, Fe, microrelief, substrate depth, degree of humification, and climate. A canonical correspondence analysis (CCA) with forward selection entered pH, P, Na, Fe, Ca, Mg, and percent H2O as the minimum number of variables which best explains species variation. A CCA of the lower strata vascular plants demonstrated the importance of the upper strata (percent overstory) on species' distributions. Gradients of pH–alkalinity and percent overstory are primary in determining Maine's peatland vegetation. Other important gradients are percent H2O in upper peat, concentrations of lithic elements (P, Fe, Mn, Al, and Si) in pore water, and climate. Although these gradients partially covary, some of the variation in species' distributions can be attributed to independent aspects of individual gradients. Species richness across the range of peatland types is related to pH–alkalinity for vascular plants, and to percent H2O, microrelief, and percent overstory for bryophytes. Key words: plant communities, Maine, multivariate statistical analysis, peatlands, mires, vegetation.
APA, Harvard, Vancouver, ISO, and other styles
10

Wu, Yue, Cheng Wang, Zewen Yang, Depeng Song, Takeo Ohsaka, Futoshi Matsumoto, Xiaolin Sun, and Jianfei Wu. "Designing conductive networks of hybrid carbon enables stable and long-lifespan cotton-fiber-based lithium–sulfur batteries." RSC Advances 11, no. 55 (2021): 34955–62. http://dx.doi.org/10.1039/d1ra06568h.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Lithic substrate"

1

Lins, Leila Cristina Rosa de. "Propagação da lichieira por alporquia em diferentes substratos e épocas do ano." Universidade Federal de Viçosa, 2013. http://locus.ufv.br/handle/123456789/4593.

Full text
Abstract:
Made available in DSpace on 2015-03-26T13:39:56Z (GMT). No. of bitstreams: 1 texto completo.pdf: 2229897 bytes, checksum: 70eb16f12cce914df8ee78e6c6f6ea23 (MD5) Previous issue date: 2013-03-11
Conselho Nacional de Desenvolvimento Científico e Tecnológico
The aim of this study was to assess the influence of different times of the year and substrates on the rooting of air layers of lychee (Litchi chinensis Sonn.) for the production of seedlings to ensure the formation of uniform and productive orchards. Air layers were done in plants of the Bengal cultivar using leafy and healthy woody branches, with about 1.0 to 1.5 cm in diameter, in which complete girdling were performed with 2.0 cm wide at a distance of 30 to 40 cm below the apex. Then the branches were wrapped in moistened substrate. Air layering was made at six times of the year (January, March, May, July, September and November) and two substrates were used (coconut fiber and sphagnum) in a 6 x 2 factorial design in a randomized block with ten replicates, each block represented by a matrix plant. After 90 days, layers were separated from the matrix plant and evaluated for rooting and callus formation; root number, considering only the primary roots; length, area, volume and diameter of the roots; dry mass of roots and calluses, in addition to the dry mass of shoots (leaves and stems). The months of January, March, September and November showed the best results for allanalyzed variables related to rooting. With respect to the substrates, the only difference was in the months of January and March regarding root number and dry mass of roots, where the sphagnum showed the best results. The month of July was more favorable to the formation of calluses. The period between September and March was more suitable to the propagation of lychee, when there were rooting percentages above 90%, in addition to the formation of large amounts of roots.
Neste estudo, objetivou-se verificar a influência da época do ano e de diferentes substratos no enraizamento de alporques de lichieira (Litchi chinensis Sonn.), visando à produção de mudas que assegurem a formação de pomares uniformes e produtivos. Foram feitos alporques em plantas da cultivar Bengal, utilizando ramos lenhosos bem enfolhados e sadios, com cerca de 1,0 a 1,5 cm de diâmetro, nos quais foram realizados anelamentos completos de 2,0 cm de largura, à distância de 30 a 40 cm abaixo do seu ápice. Em seguida, os ramos foram envoltos por substrato umedecido. Foram avaliadas seis épocas de realização dos alporques (janeiro, março, maio, julho, setembro e novembro) e dois substratos (esfagno e fibra de coco), em um esquema fatorial 6 x 2, no delineamento em blocos casualizados com dez repetições, sendo cada bloco representado por uma planta-matriz. Passados 90 dias, os alporques foram separados da planta-matriz e avaliados quanto à porcentagem de enraizamento e de calejamento; ao número de raízes, considerando apenas as raízes primárias; ao comprimento, à área, ao volume e ao diâmetro das raízes; à massa seca de raízes e calos, além da massa seca da parte aérea (folhas e caule). Os melhores resultados para todas as variáveis relacionadas ao enraizamento analisadas foram verificados nos meses de janeiro, março, setembro e novembro. Com relação aos substratos, houve diferença apenas nos meses de janeiro e março para número de raízes e massa seca de raízes, tendo o esfagno apresentado os melhores resultados. O mês de julho foi mais propício à formação de calos. O período compreendido entre os meses de setembro e março foi o mais propício à propagação da lichieira, quando foram obtidas porcentagens de enraizamento superiores a 90%, além da formação de grande quantidade de raízes.
APA, Harvard, Vancouver, ISO, and other styles
2

Jeyaranjan, Aadithya. "Adhesion of Germanium Electrode on Nickel Substrate for Lithium Ion Battery Applications." Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5509.

Full text
Abstract:
Lithium ion batteries (LIBs) have gained increasing popularity due to their high potential, low self-discharge, zero priming and minimal memory effect. However, the emergence of electrical vehicles and hybrid electrical vehicles in the automobile industry, where LIBs are predominantly in use, instilled a need to improve LIB batteries by experimenting with new materials. Graphite, the commonly used anode material for LIBs suffers from low theoretical capacity (372 mA h g-1) and torpid rate performance. Germanium (Ge) seems to be a promising substitute of carbon due to its high theoretical capacity, high Li+ diffusivity and electrical conductivity. However, Ge undergoes large volumetric change (±370%). This causes deboning of the thin film Ge electrode from the substrate current collector, causing a rapid decrease in the electrolytic performance. The process of ion beam mixing claims to have overcome this problem. In our current study, the adhesion strength of Ge thin film over Nickel (Ni) substrate (with and without ion beam mixing) is being measured using nanoindentation and the superlayer indentation test. Nanoindentation is one of the popular techniques to measure the mechanical properties and adhesion of thin film coatings. In this technique, a very small indenter of a desired geometry indents the film/substrate pair and the work of adhesion is calculated by knowing the plastic depth of indentation and the radius of indentation. Superlayer indentation is analogous to normal indentation but with a highly stressed superlayer on top to restrict the out-of-plane displacements, it reduces the plastic pile up around the indenter tip. The results from our study strongly suggest the possibility of dramatically increasing the adhesion strength by ion bombardment, which can be achieved by atomic level intermixing of the film/substrate pair. These, in turn, suggest that Ge could be an effective successor to graphite in the near future.
APA, Harvard, Vancouver, ISO, and other styles
3

Eustache, Etienne. "Microsystèmes de stockage d'énergie sur substrat 3D." Nantes, 2016. https://archive.bu.univ-nantes.fr/pollux/show/show?id=1e832b83-4efd-4a39-8aaf-10735e08b591.

Full text
Abstract:
Conférer de l'autonomie énergétique à des objets électroniques miniatures est un défi. De nouvelles voies de recherche doivent être investiguées pour augmenter les performances des microbatteries (MB) Li-ion et des micro-supercondensateurs (MSC). A ce titre, développer des microsystèmes de stockage en topologie 30 semble être une approche prometteuse pour outrepasser les densités d'énergie des dispositifs planaires. Dans le cadre de cette thèse exploratoire, nous avons réalisé des structures 30 à l'échelle micrométrique en utilisant un procédé de gravure profonde d'un substrat de silicium. Cette architecture est utilisée comme socle commun pour la fabrication de MB Li-ion 30 et de MSC 30. Une électrode négative de MB de TiO2 a été réalisée par dépôt par couche atomique (ALD) sur les structures 30 proposées. Les caractérisations électrochimiques montrent que l'augmentation de la capacité (x30) est proportionnelle à la surface développée par l'architecture 30. Un film conforme de phosphate de lithium (Li3P04) a également été développé par ALD. La conductivité ionique de (=4. 10-7 S/cm) et l'épaisseur limitée (60 nm) de la couche placent ce matériau comme électrolyte solide potentiel de MB 30. Des MSC à électrodes 30 interdigitées ont par ailleurs été fabriqués. Des électrodes de Mn02 ont été déposées en couche mince par dépôt électrolytique sur le substrat 30. Les résultats montrent que cette approche permet d'obtenir des dispositifs pseudocapacitifs à capacités spécifiques particulièrement élevées
Providing autonomy to miniaturized electronic devices is a challenge. New research directions should be investigated in order to increase the performance of Liion microbatteries (MB) and micro-supercapacitors (MSC). Developing power sources with a 30 topology instead is a promising approach to surpass the planar devices energy density. Ln this exploratory thesis, we realized 30 structures at the micrometric scale by deep etching of a silicon substrate. This architecture is used as a common base to fabricate Li-ion MB and MSC. A TiO2 MB negative electrode has been realized by atomic layer deposition (ALD) on top of the microstructures. Electrochemical characterizations show a proportional increase (x30) of the capacity with the specific surface area of the 30 architecture. A conformal lithium phosphate (Li3P04) film has also been developed by ALD. The ionic conductivity (=4. 10-7 S/cm) and the limited thickness (60 nm) of the layer establish this material as a 30 MB potential solid-state electrolyte. Furthermore, MSC with interdigitated 30 electrodes have been fabricated. Mn02 thin films have been deposited by electrodeposition on top of the 30 substrate. Results demonstrate that this approach allow to achieve pseudocapacitive devices with high specific capacitance
APA, Harvard, Vancouver, ISO, and other styles
4

Gil, Rashapal Ram. "Aluminium and its alloy as substrates for the lithium rechargeable electrode." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363538.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

van, Lierop Jean. "Influence of variations in ceramic thickness and bonding substrate on the fracture resistance of lithium disilicate restorations." University of the Western Cape, 2017. http://hdl.handle.net/11394/6626.

Full text
Abstract:
Magister Scientiae Dentium - MSc(Dent)
Restorative dentistry aims to replace lost or damaged tooth structure with durable and life-like alternatives. To accommodate the inherent limitations and weakness of the restorative materials, preparation techniques often require the sacrifice of healthy tooth structure to create enough restorative space. This can lead to weakening of the remaining tooth structure, with subsequent damage or catastrophic failure. When using indirect restoratives, the development of adhesive luting agents (adhesive cements) and stronger allporcelain restorations (lithium disilicate) has contributed to the development of “minimally invasive” preparation techniques and concepts such as cavity design optimization (CDO) and bio-substitution. With these techniques, resin materials are combined with ceramic restoratives in an attempt to not only produce strong restorations, but also increase the longevity of the remaining tooth. The clinician needs to therefore find the ideal preparation design that combine such materials to produces a clinically performing restoration while increasing the strength and longevity of the underlying tooth.
APA, Harvard, Vancouver, ISO, and other styles
6

Henrot, Fabien. "Composants à hauts facteurs de forme pour les résonateurs acousto-électriques et les dispositifs électro-optiques sur substrats mono-cristallins." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2032/document.

Full text
Abstract:
La miniaturisation est l’objectif actuel de tous les fabricants de composants radio-fréquence depuis plusieursdécennies. Si les composants actifs pour la microélectronique sont fondés sur la structuration de plaquesde silicium, les composants passifs reposent sur l’utilisation de cristaux tels que le quartz ou le niobate delithium. Ce dernier est particulièrement utilisé quand il s’agit de générer et exploiter des ondes élastiques, ainsique pour le guidage de faisceaux lumineux afin de réaliser des filtres ou des capteurs sensibles à différentsparamètres environnementaux. L’amélioration du guidage de ces ondes permet un gain en consommation et encompacité des dispositifs mais nécessite une structuration de la matière souvent tridimensionnelle. Cette étapetechnologique clé est industriellement mature pour la mise en forme du silicium, mais s’avère di_cilementtransposable à des matériaux tels que le quartz ou le niobate de lithium. Les travaux présentés dans cemanuscrit visent à réaliser des structures tridimensionnelles à hauts facteurs de forme dans des matériauxmonocristallins à l’aide d’une scie circulaire de précision. Des structures utilisant l’inversion périodique dedomaine ferroélectrique seront réalisées afin de les utiliser pour y guider des ondes élastiques possédant descouplages électromécaniques particulièrement élevées. Le guidage d’ondes optiques par le biais de ces mêmesstructures permet une amélioration du confinement par rapport aux systèmes de guidage massifs classiquescouramment utilisés pour la réalisation de filtre ou de modulateur électro-optiques. En utilisant conjointementle guidage d’ondes optiques et les domaines ferroélectriques alternés, les structures ainsi découpées permettentl’apparition de phénomènes optiques non-linéaires exaltés par l’amélioration du confinement. Ces structuresont ainsi montré leur intérêt dans plusieurs domaines de la physique avec un champ applicatif particulièrementvaste
Over the past decades, minutiarization and compacity have become a focus subject for companies specialisedin the manufacturing of radio-frequency components. Active components are typically manuafctured onsilicon wafers with well-known structuring methods. Passive ones are often manufactured on single cristalsuch as Quartz or Lithium Niobate, especially for acoustic wave generation or lightwave guiding. Theguiding of optical or acoustical waves leads to the manufacturing of sensors or filters which can be usedfor telecommunications or for the industry. Improvement in waveguiding allows for less power-consuming andmore compact devices but a 3D-structuring is usually required. This technology readness is high leveled forsilicon structuring but not for single crystals such as Lithium Niobate. This work presents the development andthe manufacturing of high aspect ratio three-dimensionnal structures in single-crystals using precise sawing.These structures show an optical waveguiding capability which allow the improvements of electro-opticmodulators or filters. Combined with a periodic reversing of Lithium Niobate polarization, these structuresallows for bulk acoustic wave generation leading to high electromechanical coupling and equivalent phasevelocity resonant modes. In non-linear optic field, this kind of structures lead to the improvement of secondharmonic generation e_ciency by reducing the cross section of waveguide. The manufactured devices in theframework of this project can actuelly be used in several domains of physic
APA, Harvard, Vancouver, ISO, and other styles
7

Palanisamy, Asha. "High Energy Density Battery for Wearable Electronics and Sensors." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1480511507315736.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Brigouleix, Catherine. "Elaboration et étude de couches minces électrochromes déposées par pulvérisation cathodique : mise en œuvre de démonstrateurs sur substrat flexible." Bordeaux 1, 2003. http://www.theses.fr/2003BOR12648.

Full text
Abstract:
L'objectif de la thèse est d'étudier des dispositifs électrochromes sur support flexible. Ces systèmes ont une transmission dans le visible et le proche infra-rouge qui peut être modulée sous l'effet d'une tension électrique. Ils sont constitués d'un empilement de couches minces : - un film électrochrome à coloration cathodique à base de WO3, - une couche conductrice ionique au lithium, inorganique (LiPON) ou organique gélifiée, - une contre-électrode à coloration anodique (''LixNi0. 5O'') ou optiquement passive (V2O5). Cet ensemble, compris entre deux électrodes conductrices transparentes est déposé sur PET. Les couches électrochromes et l'électrolyte inorganique sont déposés par pulvérisation cathodique. La corrélation entre paramètres de dépôt, propriétés électrochromes et propriétés structurales a été établie
The aim of this thesis was to study flexible electrochromic devices. They can modulate their visible and near infra-red transmittance under polarization. They are constituted of a stack of thin layers : i. ) an electrochromic active layer based on nanocrystaline WO3, coloured under cathodic bias, ii. ) a lithium-ion conducting electrolyte which can be based either on photopolymerizable organic constituents, or on an inorganic film (LiPON), iii. ) an ion storage counter electrode, which can be either an anodic colouring material such as nanocrystalline ''LixNi0. 5O'', or an optically passive oxide such as nanocristalline lamellar ''V2O5/TiO2''. This set of layers is sandwiched between two transparent conductive electrodes deposited on polyethyleneterephtalate flexible substrates. Electrochromic layers and inorganic electrolyte were deposited by cathodic sputtering. Correlation between deposition parameters, electrochromic properties and structural properties were established
APA, Harvard, Vancouver, ISO, and other styles
9

Kang, Sangbeom. "The epitaxial growth of GaN and A1GaN/GaN Heterostructure Field Effect Transistors (HFET) on Lithium Gallate (LiGaO₂) substrates." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/13903.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ravi, Ajaay. "Run-Time Active Leakage Control Mechanism based on a Light Threshold Voltage Hopping Technique (LITHE)." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1302550444.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Lithic substrate"

1

Sagar, Prity, Anfal Arshi, and Awadh Kishore Roy. "Determination of Substrate Medium for Litchi Marcot Establishment in Nursery." In Lychee Disease Management, 67–74. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4247-8_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Nygren, Christopher J. "Sedimentary Aesthetics." In Contamination and Purity in Early Modern Art and Architecture. Nieuwe Prinsengracht 89 1018 VR Amsterdam Nederland: Amsterdam University Press, 2021. http://dx.doi.org/10.5117/9789462988699_ch03.

Full text
Abstract:
Around 1530 artists began painting on stone. Early on artists mostly used slate, though toward the end of the sixteenth century they began painting on various kinds of semi-precious stones like lapis lazuli. Such pictures were appreciated for how the pure lithic material was augmented by the painter. In the seventeenth century, artists (especially in Florence) began painting on a particular kind of sedimentary stone known as pietra d’Arno that subverts this aesthetic. Unlike semi-precious stones whose material splendor and purity lends itself to aesthetic appreciation, this stone is unrelentingly base: pietra d’Arno is essentially solidified mud. This essay investigates how artists used this sedimentary substrate to support ethical investigations of humankind’s position as fallen beings in the created world.
APA, Harvard, Vancouver, ISO, and other styles
3

Rozman, Martin, and Miha Lukšič. "Morphology and Functionalization of Metal Foils and Other Surfaces for Electrochemical Applications." In Handbook of Research on Tribology in Coatings and Surface Treatment, 359–89. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-9683-8.ch015.

Full text
Abstract:
Electrochemical applications had their first major impact in the late 20th century with the development of improved energy storage and conversion systems such as lithium-ion batteries, organic-inorganic dye-sensitized solar cells, and even e-ink displays. Depending on the requirements, the electrodes can be made of different materials, such as metal or alloy sheets, foils, bars or conductive ceramics, conductive polymers, etc. In this chapter, methods for surface functionalization and characterization of metallic and non-metallic surfaces used as electrode substrates are presented. The focus is on the use of metal foils in lithium-ion batteries and especially in the novel architecture of optoelectronic devices – from electrochromic and photovoltaic devices to biosensors.
APA, Harvard, Vancouver, ISO, and other styles
4

Ohno, H., and K. Tomioka. "Lithium-, Magnesium-, or Zinc-Mediated Reactions of Propargylic and Related Substrates." In Cumulenes and Allenes, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-044-00125.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Taber, Douglass F. "The Tanino/Miyashita Synthesis of Solanoeclepin A." In Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0104.

Full text
Abstract:
Building on the Tanino synthesis of glycinoeclepin (Organic Highlights, January 3, 2011), the hatch-stimulating substance for the soybean cyst nematode, Keiji Tanino of Hokkaido University and Masaaki Miyashita, now at Kogakuin University, described (Nat. Chem. 2011, 3, 484) a convergent synthesis of solanoeclepin A 3, the hatch-stimulating substance for the potato cyst nematode. A key step in the synthesis was the diastereoselective Diels-Alder cyclization of 1 to 2. The starting point for the synthesis was the conjugate addition of 5 to 3-methyl cyclohexenone 4, followed by aldol condensation. The secondary acetate corresponding to 6 was readily resolved by lipase hydrolysis. The next challenge was the installation of the angular vinyl group. Enone transposition gave 7, to which vinyl Grignard added with high diastereocontrol, leading to the diol 8. TMSOTf-mediated epoxide rearrangement with concomitant 1,2 vinyl shift then delivered 9. Epoxidation followed by Stork cyclization completed the construction of the cyclobutane 10. The allylic alcohol 12 was enantiomerically pure, so the relative configuration of the sidechain cyclopropane could be set by the Charette protocol. Grieco dehydration of 14 then gave 16, a latent form of the cyclobutanone of 3. Condensation of the ketone 17 with 18 delivered the expected keto enamine, which rearranged nicely on exposure to Tf2O to the aldehyde 19. Diastereoselective addition of the furyl lithium 20 followed by Pd-catalyzed coupling with 21 then completed the assembly of the Diels-Alder substrate 1. The Me2AlCl-mediated intramolecular Diels-Alder cyclization of 1 led to 2 with remarkable diastereocontrol. Oxidation gave 22, that was further oxidized to the protected enol 23. Reduction, alkene cleavage, and protecting group manipulation then set the stage for the final oxidation of 24 to solanoeclepin A 3.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Lithic substrate"

1

Fainman, Y., F. Xu, R. Tyan, D. Marom, P. Shames, P. C. Sun, J. Ford, A. Scherer, and A. Krishnamoorthy. "Polarization selective diffractive optical elements and applications." In Diffractive Optics and Micro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/domo.1998.dmd.1a.

Full text
Abstract:
Computer-generated holograms (CGH) fabricated as phase-only optical elements have proven to be useful for various photonic systems applications. Such elements are normally capable of implementing fixed functionality. However, the performances of packaged photonic systems will be further enhanced with availability of CGH elements with multifunctionality in polarization or color, and programmability. We have constructed polarization selective CGH which apply an independent phase profile during readout by horizontal and vertical light polarizations1–3. These elements are composed of two surface relief etched birefringent substrates joined face to face. We describe the design methodology for arbitrary birefringent substrate and gap materials. We show how these holograms are fabricated with standard microelectronics technology, and discuss the effects of etching and alignment errors on performance. We have demonstrated high diffraction efficiency with a polarization contrast ratio of over 100:1, using a multilevel phase hologram made from two birefringent lithium niobate substrates2.
APA, Harvard, Vancouver, ISO, and other styles
2

Camperi-Ginestet, C., M. Hargis, N. Jokerst, M. Allen, and T. Drabik. "Alignable epitaxial lift off GaAs materials using polyimide diaphragms." In Integrated Photonics Research. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/ipr.1991.tud16.

Full text
Abstract:
The selective and alignable deposition of patterned, thin GaAs/GaAlAs based materials and devices onto host substrates such as Si, glass, lithium niobate, and polymers is important for the integration of GaAs with other material systems. We use a thin polyimide diaphragm as the transparent transfer medium for these thin patterned pieces of epitaxial material. Each of these devices or a group of devices is then optically aligned and selectively deposited onto the host substrate. This enables sparse distribution and frugal use of the costly GaAs material in addition to the alignable deposition of the devices, enhancing the manufacturing attractiveness of these thin epitaxial layers.
APA, Harvard, Vancouver, ISO, and other styles
3

Silva, W. J., and C. H. Bulmer. "Compositional Effects on Lithium Niobate Substrates." In 1985 Cambridge Symposium, edited by Sriram Sriram. SPIE, 1985. http://dx.doi.org/10.1117/12.950741.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rabiei, Payam, Jichi Ma, Jeff Chiles, Saeed Khan, and Sasan Fathpour. "Lithium niobate photonics on silicon substrates." In 2014 IEEE Photonics Conference (IPC). IEEE, 2014. http://dx.doi.org/10.1109/ipcon.2014.6995327.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lefort, G. "Characteristics of printed antennas on lithium niobate substrate." In Tenth International Conference on Antennas and Propagation (ICAP). IEE, 1997. http://dx.doi.org/10.1049/cp:19970202.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Wang, S. Y. "Progress in Semiconductor Integrated Optics." In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.ma1.

Full text
Abstract:
Ultrahigh speed photonic components are necessary to exploit the wide bandwidth available when using lightwaves as the carrier frequency for telecommunication and instrumentation applications. On the transmitter end, a high speed modulator is needed to impress the electrical signal onto the lightwave carrier. Direct modulation of a semiconductor laser is most efficient but suffers from spectral broadening [1]. Spectrally pure signal are necessary for long distance transmission in optical fibers neccesitating the development of external modulators. Over two decades ago, modulators were developed in both lithium niobate and GaAs [2]-[6]. However due to the poor material quality in GaAs resulting in high excessive insertion losses, the material of choice was lithium niobate. With numerous refinement, the modulator and switch technologies in lithium niobate have progressed to Mach Zhenders and directional couplers with bandwidths in excess of 40 GHz. With recent improvements in III-V epitaxial technologies, substrate qualities and superlattice techniques to pin defects, the III-V modulator is once again been studied [7] [8] [9]. Moreover, because III-V materials offer the obvious advantage of monolithic integration of active/passive photonic and electronic devices to form the foundation of optical electronic integrated circuits (OEIC), III-V may eventually replace lithium niobate. Travelling wave GaAs electro-optic waveguide modulators at a wavelength of 1.3 μm with bandwidth in excess of 20 GHz have been developed and characterized. The design and characteristics of both p-i-n modulators in microstrip configuration and Schottky barrier on n− – GaAs/semi-insulating (S.I.) GaAs in the coplanar strip configuration modulators will be discussed. It will be shown that microwave loss and slowing on n + GaAs substrates will limit the bandwidth of the microstrip modulator to less than 10 GHz for a device 8 mm in length. Modulators with bandwidths in excess of 10 GHz are fabricated on S.I. GaAs substrates. The structures of the devices are shown in Fig.(l) and (2) [10][11].
APA, Harvard, Vancouver, ISO, and other styles
7

Islam, Md Sakibul. "Single Photon Mach Zehnder Interferometer on Lithium Niobate Substrate." In 2019 IEEE International Conference on Signal Processing, Information, Communication & Systems (SPICSCON). IEEE, 2019. http://dx.doi.org/10.1109/spicscon48833.2019.9065024.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Rabiei, Payam, Ashutosh Rao, Aniket Patil, Jeff Chiles, and Sasan Fahpour. "Lithium niobate compact photonic devices on silicon substrates." In Integrated Photonics Research, Silicon and Nanophotonics. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/iprsn.2015.it2a.6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Danylov, A. B., R. Yu Petrus, V. G. Haiduchok, and M. M. Vakiv. "Optical properties of ultrathin Au films on lithium niobate substrate." In 2016 International Conference on Electronics and Information Technology (EIT). IEEE, 2016. http://dx.doi.org/10.1109/iceait.2016.7500988.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Xu, Mengyue, Shengqian Gao, Heyun Tan, and Xinlun Cai. "CMOS-level-voltage Substrate-removed Thin-film Lithium Niobate Modulator." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/ofc.2022.th1j.3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Lithic substrate' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography