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Letteratura scientifica selezionata sul tema "Chalk cave"

Autore: Grafiati

Pubblicato: 11 gennaio 2025

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Articoli di riviste sul tema "Chalk cave"

Ballesteros, Daniel, Andrew Farrant, Carole Nehme, Mark Woods, Dominique Todisco e Damase Mouralis. "Stratigraphical influence on chalk cave development in Upper Normandy, France: implications for chalk hydrogeology". International Journal of Speleology 49, n. 3 (settembre 2020): 187–208. http://dx.doi.org/10.5038/1827-806x.49.3.2319.

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Classically, the Upper Cretaceous Chalk Group aquifer of northwest Europe is conceptualized as a homogenous dual-porosity aquifer, with high porosity related to its fine-grained porous matrix, and intermediate hydraulic conductivity associated with fractures. However, an increasing number of hydrological studies visualize the Chalk as a heterogeneous karst aquifer due to the localised presence of dissolutionally enlarged conduits. Field investigation suggests that cave development is guided by distinct stratigraphical and tectonic discontinuities within the rock mass. Identifying which potential inception horizons within the Chalk aquifer are favoured, and why, is important for developing future robust conceptual models of groundwater behaviour. This study focusses on the Chalk of the Upper Normandy region in France where karstic conduits are common and are linked to major sources of groundwater for public water supply. We analyse the geometry and geomorphology of six chalk caves exposed in the Seine Valley with an aggregated length of over 5.7 km, along with other caves in southern England, and identify the key inception horizons associated with their development. The data shows that prominent Turonian, Coniacian and Santonian hardgrounds have influenced the development of 68% of the studied caves length, with sheet-flints and marl seams also playing a prominent role. Caves developed on or between hardgrounds typically display a complex interlinked anastomotic passage network, whereas passages subjected to paragenetic conditions caused by a high sediment flux tend to be concentrated into fewer, larger conduits. The new evidence from Normandy and Southern England demonstrates the role of lithostratigraphy, and in particular stratigraphical discontinuities on conduit development. The data reinforces the idea that the Chalk aquifer should be viewed as a heterogeneous triple porosity karstic aquifer, in which conduit development is influenced by key stratigraphical discontinuities. This improved conceptual model can be used to develop better groundwater flow models and improved catchment delineation.

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Ozgambaev, Kuralbay, e Dana Mun. "EXPERIENCE OF RESTORATION OF MONUMENTS OF FOLK ARCHITECTURE OF THE MANGYSTAU REGION". Bulletin of Kazakh Leading Academy of Architecture and Construction 83, n. 1 (15 gennaio 2022): 55–63. http://dx.doi.org/10.51488/1680-080x/2022.1-08.

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The article examines examples of traditional memorial architecture, typical for the Mangistau region, made of local natural chalk stone. Methods and technologies of their restoration are studied on certain types of buildings, such as mausoleums, saganatams, cave mosques. Materials of natural and historical archival research were used. The data from the experience of the authors on the implementation of restoration work on these monuments, on the features of the restoration depending on the type of the monument of folk architecture are presented.

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Степкин, Виталий Викторович. "Мария Шерстюкова: к 200-летию преставления основательницы Белогорской пещеры". Традиции и современность, n. 32 (29 maggio 2023): 30–45. http://dx.doi.org/10.33876/2687-119x/2023-32/30-45.

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Поводом к написанию статьи стала знаменательная дата: 200-летие со дня кончины подвижницы благочестия Марии Константиновны Шерстюковой, основательницы Белогорской пещеры в Воронежской губ., самого протяженного культового подземелья в Восточной Европе. Целью исследования является рассмотрение формирования культа Марии-пещерницы на различных этапах истории Русской Православной Церкви. В работе рассматривается исторический контекст событий, связанных с основанием Белогорской пещеры в 1796 г. в меловом склоне долины реки Дон; анализируются различные архивные варианты биографии Марии Шерстюковой; затрагиваются народные легенды о Марии-пещернице; изучается развитие культа подвижницы благочестия, выясняется отношение к ней сегодня в Белогорском Воскресенском монастыре. Делается вывод об устоявшейся народной и церковной традиции почитания данной подвижницы благочестия. The article was written on the occasion of a memorable date: the 200th anniversary year from the death of Maria Konstantinovna Sherstjukova, who was a pious hermit and a founder of Belogorye cave in Voronezh region, the longest cult caves in Eastern Europe. The research objective is to consider Maria’s cult as a cave digger on different stages of the Russian Orthodox Church. The research paper deals with historical context of events connected with Belogorye cave foundation in 1796 in a chalk hillside of the Don river valley; analyzes different archival variants of Maria Sherstjukova’s biography; addresses folk tales about cave digger Maria; studies the development of the pious hermit cult, explores today attitude to her in Belogorie Resurrection Monastery. It is concluded about an established folk and church tradition to acknowledge the pious hermit.

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Stepkin, Vitaliy Viktorovich, e Aleksey Aleksandrovich Gunko. "Caves in catacomb movement of the Russian Orthodox Church on the territory of the Don and the Volga Region in 1920-1940s". Samara Journal of Science 7, n. 1 (1 marzo 2018): 197–201. http://dx.doi.org/10.17816/snv201871213.

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The paper examines creation and application history of cave space in catacomb movement of the Russian Orthodox Church on the territory of the Don and the Volga Region in 1920-1940s. Development of cave digging on these territories was promoted by the fact of their frontier position, allowing searching for a hiding place for the ideas, differing from the mainstream society. The caves use as shelters and places of worship in the Don Region is exemplified by the territory of Voronezh Region, where in the revolution period caves were dug in the chalk mass near the village of Karayashnik, and traditionally honored by the people loci of sacred space were used like caves in Divnogorye and on Shatrishche Mount. Caves near the village of Karayashnik were used as a place of worship by a conservative part of peasants being supporters of both the Patriarchal Church and the Fedorovtsy sect. Caves in Divnogorye were used by Joanites sect, caves on Shatrishche Mount were used by so-called True Orthodox Church. In addition to the chalk caves in the Don Region people used underground of houses as secret places of worship. Examples of such undergrounds are hidden caves in the villages of Troitskoe and Novopokrovka, equipped by one of communities of so-called True Orthodox Christians. The paper considers caves use in the Volga Region through the example of the territory of the Republic of Tatarstan, where communities of the True Orthodox Church acted, creating cult undergrounds under houses in the town of Bugulma and villages of Akkireevo, Zabugorovka, Crym-Saray Naumovka and Novoe Ilmovo. Together with territories of personal farmsteads, caves were created outside villages, usually in a forest zone. For example, near the village of Novosheshminsk there was an underground monastery, near villages of Volchya Sloboda and Elantovo there were underground temples. Activities of the underground religious communities referred to in the paper were ceased due to state punitive measures.

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Stepkin, Vitalii, e Ivan Smirnov. "An attempt at making a cave monastery in Kalach, Voronezh guberniya, in the late 19th — early 20th centuries". St. Tikhons' University Review 116 (29 febbraio 2024): 55–63. http://dx.doi.org/10.15382/sturii2024116.55-63.

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Kalach caves dug out in a chalk relic in the town of Kalach, Voronezh region, is an underinvestigated historical and cultural heritage site. The archive materials found in the funds of RSHA, together with evidence of local people, provide insight into the final period of the cult dungeon functioning in the late XIX – early XX centuries. At that time the rural community of Kalach made an attempt to establish there an official orthodox cave monastery. On the 11th of August, 1885, residents of Kalach authorized peasants Ivan Serjakov, Matvey Bezugly and Gavriil Lebedinsky to solicit different authorities for a monastery foundation. The community also allocated 1300 roubles and 36 dessiatines of land area for the monastery arrangement. The rural community request was examined in Voronezh Ecclesiastical Consistory, Voronezh Provincial Government, Voronezh Provincial Peasant Council and in the Second (Peasant) Senate Department. The attempt was not successful, it encountered resistance of authorities. Meanwhile the cave diggers managed to accommodate the caves and arrange regular divine service by the local secular clergy. Functioning of the caves as a sacred locus for the rural community was interrupted by revolution events of early XX century. At present Kalach caves are put on Russian cultural heritage register.

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Kamruzzaman, Asm, Manika Prasad e Stephen Sonnenberg. "Petrophysical rock typing in unconventional shale plays: The Niobrara Formation case study". Interpretation 7, n. 4 (1 novembre 2019): SJ7—SJ22. http://dx.doi.org/10.1190/int-2018-0231.1.

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Production from organic-rich shale petroleum systems is extremely challenging due to the complex rock and flow characteristics. An accurate characterization of shale reservoir rock properties would positively impact hydrocarbon exploration and production planning. We integrate large-scale geologic components with small-scale petrophysical rock properties to categorize distinct rock types in low-porosity and low-permeability shales. We then use this workflow to distinguish three rock types in the reservoir interval of the Niobrara Shale in the Denver Basin of the United States: the Upper Chalks (A, B, and C Chalk), the Marls (A, B, and C Marl), and the Lower Chalks (D Chalk and Fort Hays Limestone). In our study area, we find that the Upper Chalk has better reservoir-rock quality, moderate source-rock potential, stiffer rocks, and a higher fraction of compliant micro- and nanopores. On the other hand, the Marls have moderate reservoir-rock quality and a higher source-rock potential. The Upper Chalks and the Marls should have major economic potential. The Lower Chalk has higher porosity and a higher fraction of micro- and nanopores; however, it exhibits poor source-rock potential. The measured core data indicate large mineralogy, organic richness, and porosity heterogeneities throughout the Niobrara interval at all scales.

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Степкин, В. В., e И. А. Смирнов. "Letters from D.M. Strukov’s fund in the Russian State Historical Archive and the dating of Via Dolorosa in Kalach caves, Voronezh Region". Proceedings in Archaeology and History of Ancient and Medieval Black Sea Region, n. 14 (23 settembre 2022): 263–70. http://dx.doi.org/10.53737/2713-2021.2022.85.17.011.

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Калачеевская культовая пещера в г. Калач Воронежской области вырублена в меловом останце. Суммарная протяжённость её ходов составляет 892 м. В ней имеются помещения различного назначения: храмы, часовни, кельи, коридоры и пр. Центральные и северные отрезки пещерных лабиринтов калькируют улицу Виа Долороза в Иерусалиме, символизирующую Крестный путь Иисуса Христа. Письма, обнаруженные в фонде Д.М. Струкова в РГИА, позволяют углубить и уточнить знания о датировке калачеевских лабиринтов. Вместе с тем, противоречивый характер этих сведений не позволяет сделать окончательный вывод о времени возникновения пещеры. Kalach cult caves are dug out in a chalk butte in the town of Kalach, Voronezh Region. Their total length makes 892 m. The caves contain rooms of different use: temples, chapels, cells, corridors, and more. Central and northern sections of cave labyrinths are known to replicate the Via Dolorosa in Jerusalemrepresenting Christ’s way of the Cross. The letters found in D.M. Strukov’s fund in the Russian State Historical Archive may enhance our insights into Kalach labyrinths dating. Concurrently, because of a contradictory character of the accounts under study, it is inconclusive exactly what the time of Kalach caves construction is.

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Peng, Bo, Jia-Qi Liang, Ran Zhang, Xia-Yu Tian, Chao Dong, Cuifeng Tang, Xin-Xiang A et al. "Determination and Analysis of the Content and Distribution of Mineral Elements in Black Rice by SEM-EDS". Journal of Agricultural Science 13, n. 9 (15 agosto 2021): 122. http://dx.doi.org/10.5539/jas.v13n9p122.

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Black rice has very superior medicinal value. Since ancient times, it has been used as a nourishing and health-care rice for medicine and food. It has powerful functions such as disease prevention, regulation of circadian rhythm, and promotion of physical recovery. It is suitable for long-term consumption. In this paper, optical microscope, scanning electron microscope and energy dispersive spectrometer (SEM-EDS) were used successively to visualize and quantitatively analyze the element distribution in the chalky and non-chalky areas of two indica rice varieties in Southern Henan. The results showed that black rice has rich C and O content, followed by N, P, S content, Mg, K, Ca, Mn, Zn content is less. The content of the O element in the chalky area is higher than that of the non-chalky area, while many elements such as C, N, P, S are significantly higher in the non-chalk areas than in the chalk areas; especially the N and S elements are the best indicators of protein, the content in chalkiness area was lower than that in non-chalky area. It can be inferred that the protein content in non-chalky part was higher than that in chalky part, that is, chalkiness character of black rice would affect the nutritional quality of rice. Therefore, our results showed the distribution of elements and protein in black rice, which is helpful for the cultivation of new high-quality black rice varieties in the future.

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WOOLHOUSE, G., J. E. ANDREWS, A. MARCA-BELL e P. F. DENNIS. "Geochemical constraints on the origin of enigmatic cemented chalks, Norfolk, UK". Geological Magazine 146, n. 2 (17 settembre 2008): 291–99. http://dx.doi.org/10.1017/s0016756808005487.

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AbstractVery hard cemented chalk stacks and crusts found locally in the upper part of the Cretaceous Chalk of north Norfolk, UK, are related to solution features. The solution features, mainly pipes and caves, formed after deposition of the overlying Middle Pleistocene Wroxham Crag, probably by routing of sub-glacial, or glacial, melt-waters derived from late Pleistocene glaciers. New geochemical (particularly stable isotope) data shows that cementation of the chalks, although related spatially to the solution features, was not caused by glacier-derived waters. The carbon isotope composition of the chalk cements is typically around −9.5‰, indicative of biologically active soils. Moreover, the oxygen isotope compositions of the cements, around −5‰, are incompatible with water δ18O values much below −9 to −10‰ (which probably precludes isotopically negative glacier-derived water), as resulting palaeo-temperatures are below zero. Taken together, the isotope data suggest chalk cementation occurred under interglacial conditions similar to the present. Dissolved calcium carbonate for cementation came from dissolution of reworked chalk in overlying MIS 12 glacial tills.

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Laignel, Benoit, e Robert Meyer. "La desilicification des silex des formations residuelles a silex de l'ouest du bassin de Paris". Bulletin de la Société Géologique de France 171, n. 5 (1 settembre 2000): 569–76. http://dx.doi.org/10.2113/171.5.569.

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Abstract In NW Europe, chalk areas are generally covered with clay-with-flints (CWF). These formations are made of flints with a clayey or silty-clayey matrix. In the literature devoted to CWF, the flint dissolution during the weathering of chalk was poorly studied. In this study, we provide an estimation of this phenomenon in the western Paris Basin, by comparisons between the flints of CWF and those of chalks based on mineralogy, size, cortex and surface cavities of flints. Our results show that the mineralogy and thickness of flints have not been affected by the weathering. Only the volumes of cortex and surface cavities have increased. These two parametres allow us to quantify the flint dissolution. Flint dissolution is low: the amount of dissolved silica in flints varies between 0.9 and 7.3%. These low values show that weathering of chalk who has led to the creation of CWF has not reached the intensity of a lateritic type weathering, as is the case in the ferralitic soil.

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Più fonti

Tesi sul tema "Chalk cave"

Bejarano, Arias Ingrid. "Ηigh resοlutiοn past climate and paleοenvirοnmental recοnstructiοn during the Ηοlοcene : a stalagmite-based recοrds study frοm Caumοnt cave, Νοrmandy (France)". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR060.

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Les recherches sur les spéléothèmes sont de plus en plus demandées pour les reconstructions du climat passé, grâce à la richesse des informations extraites des proxies géochimiques enregistrés pendant la précipitation du calcaire dissous sous sa forme minérale, la calcite. Parmi ces proxies, les isotopes stables et les éléments traces fournissent des informations sur les variations climatiques (précipitations et température) et la couverture végétale. En outre, les datations absolues calculées gràçe à la méthode Uranium/Thorium (U/Th) permettent de contraindre d’une manière assez précises la chronologie de ces variations climatiques dans le temps. Cette thèse présente la toute première étude paléoclimatique basée sur l’analyse géochimiques des stalagmites du nord-ouest de la France, issues de la grotte crayeuse de Caumont. Bien que plusieurs recherches sur la reconstruction paléoenvironnementale de l'Holocène en Normandie aient été publiées, ces études présentent une résolution plus faible et nécessitent des datations plus précises pour mieux contraindre les variations climatiques du passé. Ces lacunes justifient notre recherche sur les stalagmites de Caumont, permettant ainsi de compléter les études paléoclimatiques et paléoenvironnementales régionales.L’objectif de cette thèse est d'étudier le potentiel des stalagmites de la grotte et carrière de Caumont en tant qu'enregistreurs du climat et des conditions environnementales, à haute résolution, au cours des derniers 10.000 ans. Pour réaliser cet objectif principal, nous avons effectué un suivi climatique de la grotte, des datations U/Th sur les échantillons prélevés ainsi que des analyses d'isotopes stables (δ13C et δ18O) et d'éléments traces. Les résultats de ce suivi climatique sur 18 mois ont permis d’identifier les conditions environnementales et les facteurs qui influencent le signal isotopique au moment de la précipitation de la calcite. Le signal du δ13C reflète la dynamique de l'infiltration effective (ou efficiente) durant les saisons plus sèches (l’été), influençant, sur le long terme, la précipitation primaire de la calcite au sein même de l’épikarst (PCP). Le signal du δ18O révèle plus des changements dans la quantité des précipitations, et serait liée plus précisément à l’infiltration après déduction de l’évapotranspiration au sein de l’epikarst. La stalagmite récente (CCB-1) qui couvre le 20e siècle fournit un enregistrement paléoclimatique à haute résolution, permettant une comparaison directe avec les données météorologiques du 20e siècle. Cette étude a permis d'identifier les épisodes de sécheresse historiques du 20e et le début du 21e siècle. Une évaluation plus poussée des enregistrements géochimiques avec l'indice précipitation - évapotranspiration (SPEI) montre un changement dans la dynamique de la sécheresse au cours des deux dernières décennies. Nos résultats montrent que si, pendant la majeure partie du 20e siècle, les sécheresses semblent avoir été liée plus au déficit de la quantité de précipitations, la dynamique aurait changé à la fin des années 1990 avec une évapotranspiration plus élevée, associée à l'augmentation de la température. Les stalagmites holocènes prélevées des conduits naturels à Caumont sont suffisamment sensibles pour enregistrer la variabilité climatique des derniers 10.000 ans. La comparaison des proxies géochimiques issues des stalagmites étudiées avec les enregistrements régionaux disponibles donne un aperçu de l'évolution du paléoclimat en Normandie, complète la reconstruction paléoenvironnementale des études précédentes et montre les débuts de l'impact anthropique sur le paysage. Les tendances climatiques pluri-centennales des stalagmites de Caumont sont généralement comparables à celles d’autres sites du Nord-Ouest Européen. Ceci est démontré en comparant les enregistrements Holocène des stalagmites de Caumont avec ceux des spéléothèmes de sites proches, ceux d’autres archives continentales (lac, tourbière) et marines de
Speleothem-based studies are globally very significant for paleoclimate reconstructions given the abundance of information that can be extracted from the geochemical proxies recorded during calcite precipitation. The proxies (stable isotope and trace elements), provide information on precipitation, temperature and vegetation conditions that, along with the Uranium/Thorium (U/Th) dating method, allow to reconstruct the climate back in time. This thesis presents the first stalagmite-based studies in the north-western France, from the chalk cave of Caumont. Whilst research on paleoenvironmental reconstruction of the Holocene in Normandy has been published, such studies present lower resolution and need better age constraints. This information gap highlights the importance of Caumont stalagmites to complement the regional studies. The aim of this thesis is to investigate the potential of the Caumont cave and quarry stalagmites as recorders of climate and environmental conditions, at high resolution, during the past 10 ka. To achieve this we did cave monitoring, U-series dating, stable isotopes (δ13C and δ18O) and trace elements analysis. The 18-month monitoring results provide an understanding of the cave dynamics and the factors influencing the proxy signal during calcite precipitation. The stalagmite δ13C signal reflects summer effective infiltration dynamics, influencing (longer-term) prior carbonate precipitation. The δ18O signal likely reveals changes in the composition of precipitation above the cave, from annual to multi-annual scale. The recent stalagmite (CCB-1), yield a high-resolution record that covers the 20th century, allowing direct comparison with meteorological data. Such study helped to identify the historical drought events of the 20th and 21st centuries. Further evaluation of geochemical records with the precipitation-evapotranspiration index (SPEI) shows a shift in drought dynamics for the past two decades. During most of the 20th century, droughts appear driven by a pluvial (deficit) regime, but from the late 1990s, drought was driven by higher evapotranspiration due to increased temperature. The Holocene stalagmites from the natural conduits of Caumont site show enough sensitivity to record the climate variability of the last 10 ka. The comparison of the geochemical proxies with the regional records provides insight of the paleoclimate evolution in Normandy, complements the paleoenvironmental reconstruction of previous studies and agrees with the onset of the human impact on the landscape. The multi-centennial climate trends from Caumont stalagmites are found generally in agreement with the Holocene climate variability for north-western Europe. This is demonstrated by comparing Caumont Holocene records with nearby speleothem records, continental archives (lake, mire) and North Atlantic marine proxy records

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Barnes, Amanda Joy. "Policy at the chalk face : a case study of the implementation of the developmental appraisal system in a primary school". Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/6912.

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Bibliography: leaves 92-98.
This case study attempts to develop an understanding of the impact the local context of the school has on policy implementation. It does so by examining the implementation of the Developmental Appraisal System (DAS) in a primary school. Local context is conceptualised as the interplay between a schools structure, culture and micro-politics. This conceptualisation is developed through a review of literature on school culture, structure and micro-politics. The literature on policy implementation and teacher appraisal is also reviewed and issues pertinent to this study are highlighted. This study argues that the policy text makes projections about the local context it enters into. The actual conditions in the school do not always match these projections made in the policy. This results in a mismatch between the policy projections and the actual conditions in the school. The approach adopted in this study is to provide an analysis of the policy text in terms of the projections it makes with regard to the school. This is to compared it with an analysis of the data on the local context of the school in order to see if there is compatibility between the policy projections and the actual conditions in the school. The study also argues that the policy implementation is enhanced when the policy provides the means or conditions of possibility for its own implementation. In the case of the DAS policy these means are limited since the policy only presents structural change, in the form of committees, to support its implementation. The study concludes by suggesting that the success of implementation depends partly on the compatibility between the policy projections and the actual conditions in the school. Successful implementation also depends on the practicability of the policy and the extent to which there is coherence between this policy and other policies.

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Wilson, Jennifer Keeling. "Curation and lithic technological organization studies on the Owyhee River : a case study of the Chalk Basin site (35ML143), Malheur County, Oregon". Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/J_Wilson_042507.pdf.

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Mitchell, L. T. N. "An assessment of rehabilitation gravels for Salmo trutta spawning : a case study from a small chalk stream, the River Stiffkey, Norfolk, UK". Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1478280/.

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UK salmonid stocks have shown a sharp decline over the past 50 years. River channel modification, land-use intensification and change in agricultural practices are significant factors that have contributed towards this decline. An associated accumulation of fine grained sediment in spawning substrate inhibits population recruitment at the embryo stage of the life-cycle. Additions of rehabilitation gravel to the River Stiffkey, a small chalk stream in North Norfolk, in 2003 by the Wild Trout Trust (WTT) and again in 2009 as part of the Living North Sea project aimed to augment migratory Salmo trutta L. (sea trout) populations. Rehabilitation by means of gravel introduction has anecdotal short-term benefits but physical environmental constraints at various spatial scales over the medium- to long-term have not yet been adequately quantified. In order to better understand the role of rehabilitation gravel in the reproduction and recruitment of S. trutta populations, this study examined: the physical suitability and morphosedimentary nature of rehabilitation gravel as a spawning habitat, embryo survival within rehabilitation gravel and sedimentary constraints that limit recruitment at this early life-stage, catchment controls that define the physical character of the river, and the spatial relationship between key juvenile life-stage dependent habitat types. River Stiffkey rehabilitation gravel was installed to similar specifications in 2003 and in 2009 and as such provided a spatial and temporal assessment of physical and biological variability. Results indicate the importance of catchment controls and historic regulation in determining channel processes. Rehabilitation gravel underwent a sediment composition succession from an unstable well sorted gravel (40-10 mm) type to a poorly sorted stable deposit as fine sediment (< 1 mm) was deposited and surface gravels eroded. Embryo survival declined as fine sediment (< 1 mm) accrued and permeability decreased. Rehabilitation gravel was characterised by a net loss of small sized gravel (30 > D50≥16 mm) required for spawning by non-migratory S. trutta populations and accrued an abundance of fine grained sediments (D < 1 mm) over time. Rehabilitation gravel installed in 2003 had consistently poor embryo survival, whilst gravel installed in 2009 had a positive response to a reduced sediment load stress. Consequently, rehabilitation gravel in lowland chalk stream catchments characterised by high diffuse inputs of agricultural sediment may have a short (< 10 years) lifespan. As such rehabilitation gravel is likely to have a limited role in S. trutta recruitment. Recruitment of S. trutta in the River Stiffkey was regulated by both poor abundances of key life-stage dependent habitat, and spatial connectivity between them. A river rehabilitation management approach based on a hierarchy of spatial scales that identifies and addresses ecological constraints to recovery in a systematic top-down approach from the catchment level to the macrohabitat is proposed.

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Madzivire, Alex Benjamin. "Exploring organisations that transform :". Thesis, 2003. http://hdl.handle.net/10500/1175.

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This study examines the challenges of organisational transformation in emerging economies with special reference to Zimbabwe. It is an inductive study using grounded theory, rooted in case study methodology, based on Eisenhardt's (1989) eight steps of building theory from case study research. A longitudinal multiple case study design is used to capture transformation experiences of four companies (covering four business sectors) spanning from 1980 to 2000. Fourteen constructs from the within-case analysis form the basis of data collection and these are refined through cross-case analysis. Nine themes and sixteen challenges emerge from the study. The challenges and themes are used to identify points of convergence and divergence. Issues that trigger organisational transformation are spotted and best practices explored. Ultimately, the nine emerging themes are crystallized into seven. Both the emerging model - the Madzivire Transformation Model (MaTra) - and the elaborated model - the Madzivire Collaborative Transformation Model (MaCoTra) - are constructed from the seven themes. MaCoTra is a refinement of MaTra with the following differentiating features: * The metaphor of choruses signifies the centrality of collaboration from an African perspective; * MaCoTra reflects non-linear and linear linkages between choruses; * Choruses depict the significance of songs in African bonding; * A personal commitment to transformation calls for collective bonding around values, visions, missions and strategies; * MaCoTra is a remarkable departure from steps, phases and stages espoused in most Western change literature; * MaCoTra's philosophical base is Ubuntu - `I am because we are'- focusing on independence and interdependence; * Change interventions may be through individual or multiple MaCoTra choruses; * The organisational song connects all organisational members in a choir of transformation. MaCoTra addresses the sixteen challenges and exceedingly covers challenges cited in enfolding literature. MaCoTra was tested in and outside the study sample. I assert that MaCoTra is usable in Zimbabwean companies and may be generalized through replication studies in Africa and other emerging economies. Areas of further study towards the achievement of more generalisability of the theory/model are suggested. This study addresses the existing knowledge gap and prescribes the Madzivire Collaborative Transformation Model - MaCoTra - for companies in emerging economies.
Business Management
D.B.L.

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Libri sul tema "Chalk cave"

W, Apple Michael, e Beane James A. 1944-, a cura di. Democratic schools: Lessons from the chalk face. Bhopal: Eklavya, 2006.

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Judi, Hudson, Centre for Civil Society (University of KwaZulu-Natal) e Mackay Shaun, a cura di. Like chalk, like cheese?: 'professionalism' and 'whim' in corporate giving at Anglogold Ashanti and Pick 'n Pay. Durban]: [Centre for Civil Society], 2005.

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Wendy, Ball, a cura di. Views from the chalk face: School responses to an LEA's policy on multicultural education. Coventry [West Midlands]: Centre for Research in Ethnic Relations, University of Warwick, 1985.

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Hospital and Health Services Commission of Prince Edward Island. Panel on the Hospitals' Role in the Health Community., a cura di. Chal lenge, choice & change: Health care and hospitals on Prince Edward Island. Montague, P.E.I: Hospital and Health Services Commission, 1991.

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Conference, Christian Health Association of Kenya. Providing primary health care in the era of HIV/AIDS: Report of the CHAK Annual Health Conference 2004, Brackenhurst International Conference Centre, 6th-7th April, 2004. Nairobi: Christian Health Association of Kenya, 2004.

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Chalk Song: Meditations on Werner Herzog's Cave of Forgotten Dreams. Lily Poetry Press, 2021.

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Jean Cooke - Seascapes and Chalk Caves. Nobile Publications, Piano, 2023.

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The case of the missing chalk drawings. New York: Henry Holt & Company, 2018.

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Ttok ttok ttok agi wa ŏmma nŭn chal innayo. Sŏul-si: Tong Asia, 2019.

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Pyongyang Uidae kyosu Yi Chong-bok Paksa ui changsu iyagi (Choun achim tuntunhan chaek). Choun Achim, 1993.

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Capitoli di libri sul tema "Chalk cave"

Lima Ferreira, Joana, e Christopher Wong. "Approach to the Care of the Solid Organ Transplant Recipient". In Chalk Talks in Internal Medicine, 131–36. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34814-4_21.

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Ruan, Tianming, e Yulong Mao. "Study on the Influence of Stretch-Out Operation on the Deposition of Corrosion Products and Source Term Level in the Primary Circuit of Pressurized Water Reactor". In Springer Proceedings in Physics, 68–78. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_7.

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AbstractCorrosion products in the primary circuit of Pressurized Water Reactor (PWR) during operation will cause Chalk Rivers Unidentified Deposit (CRUD), increase the level of coolant source term and deposition source term outside the core, and then affect the normal operation of PWR and the radiation field during the shutdown overhaul. Stretch-Out (SO) operation is a flexible mode of reactor, which can improve the economy of reactor. In this paper, the theoretical model of CRUD and source term analysis for PWR is introduced, and the influence of SO operation on CRUD and source term level of PWR is studied. The calculation results show that SO operation can reduce the total amount of CRUD in PWR. However, the level of coolant source term rises at the initial stage of SO operation, and the level of coolant source term can be reduced by double discharge pumps running in this case. The deposition source term outside the reactor show a gradual increasing trend. The research results provide theoretical basis and data reference for CRUD and source term level control during SO operation in PWR.

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Bowman, Elisabeth T., e W. Andy Take. "TXT-tool 3.044-1.1: The Runout of Chalk Cliff Collapses—Case Studies and Physical Model Experiments". In Landslide Dynamics: ISDR-ICL Landslide Interactive Teaching Tools, 297–314. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57777-7_16.

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Kallash, Abdullah, e Hernan Vigil. "Observations on Failure Behavior of Cut Slopes in Chalky Limestone, Case Studies in RUS Formation". In Recent Advances in Geo-Environmental Engineering, Geomechanics and Geotechnics, and Geohazards, 407–9. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01665-4_94.

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Ong, Adelina. "Traces of Care: Chalk/Dust". In Empower Arts, Animate Communities, 165–79. Department of Cultural and Religious Studies, The Chinese University of Hong Kong, 2021. http://dx.doi.org/10.54165/9789887928522/11.

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James, Henry. "In the Cage (1898)". In Literature and Science in the Nineteenth Century. Oxford University Press, 2009. http://dx.doi.org/10.1093/owc/9780199554652.003.0038.

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In James’s story, the unnamed protagonist is engaged to Mr Mudge, a grocer. When she marries, she will be leaving her office and going to live in Chalk Farm. Because telegraphy offers contact with upper-class clients and stimulates her imagination, she is not looking forward...

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Kipling, Rudyard. "The Comprehension of Private Copper". In War Stories and Poems. Oxford University Press, 2009. http://dx.doi.org/10.1093/owc/9780199555505.003.0022.

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Private Copper’s father was a Southdown shepherd; in early youth Copper had studied under him. Five years’ Army service had somewhat blunted Private Copper’s pastoral instincts, but it occurred to him as a memory of the Chalk that sheep, or in this case buck,...

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Inder, Shivani, Shefali Saluja, SANDHIR SHARMA e Harkiran Kaur. "Marking a Legacy as an Edupreneur". In Cases on the Resurgence of Emerging Businesses, 1–18. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-8488-3.ch001.

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This case study reflects the journey of a woman academician turned into edupreneur in the field of higher education in a developing economy. Dr. Madhu Chitkara has developed a high-quality educational ecosystem for nurturing talent by co-establishing and leading the development of higher education institutions in India. At the time of the case, she has achieved a number of milestones and is trying to chalk out the future steps so as to pass on the legacy to next generation leaders. The case is written to illustrate an example of a woman entrepreneur in the field of education and provide insights on her philosophy, leadership style, and strategy.

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Leeming, David Adams. "Dionysos (Dionysus)". In Mythology, 171. Oxford University PressNew York, NY, 1998. http://dx.doi.org/10.1093/oso/9780195121537.003.0078.

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Abstract It was told that they [the Titans] surprised the child-god as he was playing with the toys. Jealous Hera had instigated them to this: ... The Titans had whitened their faces with chalk. They came like spirits of the dead from the Underworld, to which Zeus had banished them. They attacked the playing boy, tore him into seven pieces and threw these into a cauldron standing on a tripod. When the flesh was boiled, they began roasting it over the fire on seven spits.

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Pachpande, Priti, e Sham Bachhav. "A Good Strategy for Growth?" In Indian Business Case Studies Volume IV, 99–106. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192869401.003.0013.

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Abstract Sun Pharmaceuticals Industries acquiring Ranbaxy Laboratories to be counted as a significant global supplier and leaders of generic medicine. Their deal has been strictly securitized by national and international regulators. Ranbaxy’s four plants were prohibited from selling drugs in USA for reporting false data of loss to seek approval from FDA. Ranbaxy being significantly valued was eyed by two equity funds and one MNC apart from Sun. Ranbaxy’s portfolio of India alone was $2 billion and with a merger valued at $3.2 billion. Ranbaxy’s export revenue is already under stress following regulatory woes in the United States, the company’s biggest export market. Sun Pharma’s efforts towards resolving Ranbaxy’s regulatory issues with the FDA can help the Mumbai-based drug maker reap lucrative results in the coming years. The giant joint venture needs to face the challenge of Competition Commission of India (CCI) approval as it is bigger in assets and turnover than the CCI limit to chalk out an existence in the domestic market.

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Atti di convegni sul tema "Chalk cave"

Azeez, Nozad, Landis West e Simon Bottrell. "Numerical Simulation of Spring Hydrograph Recession Curves for East Yorkshire Chalk Aquifer, UK". In National Cave and Karst Research Institute Symposium 5. University of South Florida Tampa Library, 2015. http://dx.doi.org/10.5038/9780991000951.1029.

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Fonty, M., S. Ghegediban e B. Giacometti. "Case studies of dewatering projects in chalk". In Chalk 2018 Engineering in Chalk. ICE Publishing, 2018. http://dx.doi.org/10.1680/eiccf.64072.135.

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Holmes, G. J., T. O. L. Roberts e M. A. Lee. "A case study of construction dewatering in Northern Province Chalk". In Chalk 2018 Engineering in Chalk. ICE Publishing, 2018. http://dx.doi.org/10.1680/eiccf.64072.147.

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Carotenuto, P., V. M. Meyer, P. J. Strøm, Z. Cabarkapa, H. St John e R. Jardine. "Installation and axial capacity of the Sheringham Shoal offshore wind farm monopiles – a case history". In Chalk 2018 Engineering in Chalk. ICE Publishing, 2018. http://dx.doi.org/10.1680/eiccf.64072.117.

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Pyrah, J. R., L. Gallagher, S. Metcalfe e S. Shepperson. "Use of biostratigraphy techniques to inform subsea cable burial projects in chalk: a case study." In Chalk 2018 Engineering in Chalk. ICE Publishing, 2018. http://dx.doi.org/10.1680/eiccf.64072.397.

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Riley, E., M. Bellhouse, R. Mortimore e A. Condron. "Use of rota-sonic drilling to investigate deep London Basin geology: a case study for an urban East London environment, including comparison to a conventionally drilled borehole". In Chalk 2018 Engineering in Chalk. ICE Publishing, 2018. http://dx.doi.org/10.1680/eiccf.64072.431.

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Penn, S., e D. P. Giles. "The development of a chalk terrain ground model using an integrated approach with high resolution LiDAR and SAR with geophysical data sets. A case study from South Hampshire". In Chalk 2018 Engineering in Chalk. ICE Publishing, 2018. http://dx.doi.org/10.1680/eiccf.64072.263.

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Puntervold, Tina, Md Ashraful Islam Khan, Iván Darío Piñerez Torrijos e Skule Strand. "Is Smart Water Flooding Smarter Than Seawater Flooding in a Fractured Chalk Reservoir?" In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210042-ms.

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Abstract It is well-known that seawater flooding has been a huge success for hydrocarbon recovery from the fractured chalk reservoir, Ekofisk, on the Norwegian Continental Shelf. Extensive laboratory studies the last decades have shown that Smart Water flooding has potential of greatly improving oil recovery beyond that obtained by standard waterflooding, due to wettability alteration, which improves reservoir sweep efficiency. However, to be economically viable compared to seawater injection, the Smart Water must be cheap, easily available, and must substantially improve oil production. Thus, the objective of this work was to investigate if a tailor-made, but cheap Smart Water could enhance oil production compared to seawater injection in an offshore chalk reservoir. Is seawater the smarter choice in offshore chalk reservoirs? Two reservoir chalk cores were used in this study and initial reservoir core wettability was estimated from optimized, in-house laboratory core restoration procedures. The potential for wettability alteration and resulting oil recovery by seawater (∼33000 ppm salinity) and Smart Water (<5000 ppm salinity, containing 20 mM SO42-, Ca2+ and Mg2+) were compared in spontaneous imbibition tests at reservoir temperature (>100 °C). Waterflooding at various rates was also performed to evaluate the displacement performance, with regards to water breakthrough and ultimate recovery, of the two injection brines studied. Reproducible initial wettability was confirmed in both reservoir cores, making a comparison of brine performance easier in spontaneous imbibition tests. The restored cores behaved initially mixed to oil-wet, imbibing limited amount of water. Both seawater and Smart Water showed potential for wettability alteration, although oil recovery by spontaneous imbibition by Smart Water was not improved compared to that by seawater. By low-rate waterflooding the Smart Water was more efficient than seawater due to the water being forced into the interior of the cores causing faster and more pronounced wettability alteration at microscopic scale, hence generating stronger positive capillary forces than in the spontaneous imbibition process. It was concluded that Smart Water flooding can potentially improve recovery beyond that obtained by seawater flooding in fractured chalk reservoirs. This high-temperature offshore chalk reservoir case study demonstrates that seawater is able to alter wettability of mixed to oil-wet reservoir chalk in a similar way as previously reported for outcrop chalk. Additionally, although seawater injection seems to be a good choice offshore, there is still potential of tailoring a Smart Water composition to both accelerate oil production, delay water breaktrough, increase ultimate oil recovery, thus lowering the field residual oil saturation if its injection is timely implemented.

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Grader, Abraham, Knut Arne Birkedal, Robert Engelman, Kristoffer Birkeland e Nils Andre Aarseth. "Integrated Physical and Digital Chalk Relative Permeability Evaluation: A Case Study". In 2023 SPWLA 64th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2023. http://dx.doi.org/10.30632/spwla-2023-0028.

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The Valhall chalk field has produced more than 1 billion barrels of oil equivalents over the last 40 years, primarily from the homogeneous Tor Formation. The underlying Hod Formation is more heterogeneous and less maturely developed. The extent of heterogeneity poses a challenge in the evaluation of multiphase fluid flow properties. Objectives: Use digital core analysis to generate early relative permeability data to leverage and compare with conventional physical steady-state relative permeability data. Accurate digital and physical description of capillary pressure and relative permeability in the high-porosity chalk is complicated by both low permeabilities and heterogeneity. The main challenge with chalk is that flow occurs in a nano-environment. Physically, the nano-environment translates to low permeability, difficult rock preparation, and extensive experimental time, especially for steady-state flow experiments. Representative three-dimensional digital rocks were generated using a combination of X-ray computed tomography (CT) and focused ion beam-scanning electron microscopy (FIB-SEM) methods. The digital rocks were used to simulate two-phase flow and generate relative permeabilities and sensitivity to wettability. The attached figure presents the overall workflow that covers the scales from the whole core to the nanopores. The right side of the figure shows a photograph of a 1.5-in.diameter core and a micro-CT slice of it in grayscale. The three-dimensional digital image presents a representative volume with the pores highlighted in blue. The green and blue Kr square points are processed lab results. The solid red lines are digital Kr data. The presentation details how the digital Kr data were obtained as well as the sensitivity of the results to wettability. Physical steady-state and digital relative permeabilities on a number of core plugs and subsets are compared in this study, which discusses the advantages of performing both as part of the formation evaluation process. The physical and digital results compare reasonably well. The physical results provide a relative permeability anchor, and the digital results provide the leverage of early results, parametric sensitivities, and quality assurance. Hence, integration between digital and physical core analysis yields a more robust understanding and input for uncertainty modeling.

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Zhang, Yuping, Eivind Hentze Samuelsen, Rene Alcaraz Frederiksen, David L. Roberts e Bill Ginty. "Calcite Scale Prediction & Management in a Chalk Reservoir - A Field Case". In SPE International Conference on Oilfield Scale. Society of Petroleum Engineers, 2010. http://dx.doi.org/10.2118/130410-ms.

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