Relevant bibliographies by topics / Seashells

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Seashells'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 July 2024

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Journal articles on the topic "Seashells"

1

Li, Tong, Rui Xin, Dongli Wang, Lili Yuan, Donghui Wu, and Ximeng Wu. "Research Progress on the Applications of Seashell Adsorption Behaviors in Cement-Based Materials." Buildings 13, no. 5 (May 15, 2023): 1289. http://dx.doi.org/10.3390/buildings13051289.

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The use of seashells to replace traditional cement-based materials and study their adsorption capacity for pollutants can expand the functional engineering application range of cement-based materials. A large amount of seashell waste is produced in coastal areas every year. How to deal with and utilize this seashell waste is a common problem faced by coastal countries and regions. This paper first reviews the principles of adsorption kinetics and adsorption isotherms to demonstrate the adsorption mechanism of shell materials. Then the effects of pH, contact time, temperature, pollutant concentration and other factors on the adsorption of heavy metal ions and basic dyes to seashells are discussed. Finally, the relevant applications of seashells in the construction field are reviewed. The results showed that the optimal pH value in the process of seashell adsorption was 5–7, the active site on the surface of the seashell particles was limited, and that it would reach saturation at a certain concentration, but would not further increase with the increase of time. The active site area of the seashell would increase with the decrease of particle size, so the selection of seashell powder with small particle size was conducive to enhancing the absorption capacity and removal efficiency. The experimental use of seashells instead of cementitious materials or natural aggregates in cement-based materials showed good adsorption capacity and would have a wide range of application prospects in permeable concrete and architectural coatings. By analyzing the research progress on factors influencing seashell adsorption performance and the applications of seashell adsorption behaviors in cement-based materials, this paper could provide ideas and methods for the design of functional cement-based adsorption materials from multiple angles.
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Bamigboye, Gideon O., Uchechi E. Okechukwu, David O. Olukanni, Daniel E. Bassey, Uchechukwu E. Okorie, Joshua Adebesin, and Kayode J. Jolayemi. "Effective Economic Combination of Waste Seashell and River Sand as Fine Aggregate in Green Concrete." Sustainability 14, no. 19 (October 8, 2022): 12822. http://dx.doi.org/10.3390/su141912822.

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This research elucidates the idea of eco-friendly concrete and highlights the benefits attainable from its effective practice towards sustainable construction materials. The design mix employed a water/cement ratio of 0.5, a concrete mix ratio of 1:2:4, varying percentages of 2.5 mm seashells, 4.75 mm river sand as fine aggregates, and granite 20 mm as coarse aggregates. Laboratory tests showed that the true slump was achieved for all mixes as a decrease in workability was observed with seashell additions. Compressive strength declined with increasing percentages of seashells at all curing ages (7, 14, and 28 days). No seashell-modified mix achieved the target strength for concrete grade 25. Nevertheless, the 10 and 20% seashell blends obtained strength requirements for concrete grade 20. The splitting tensile strength results indicated that 10–50% seashell-concrete blends yield acceptable splitting tensile strength after 28 days of curing. Correlation and regression analysis showed that compressive strength has a high negative correlation with seashell percentage and a significant correlation with splitting tensile strength. However, no significant correlation was seen between seashell percentage and splitting tensile strength. Models were further developed for predicting workability, splitting tensile strength, and compressive strength, with seashell percentage data. Green concrete production, which reutilizes waste seashells should be promoted, bearing in mind its environmental sustainability and economic prospects.
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Taqa, Ghada A., Banan N. Al-Hussary, and Nazhan Th Kashmola. "Preparing of Nano-Hydroxyapatite from Seashell and Mixed with Gold to Repair Bony Defect of Mandibular Bone in Rabbits." Iraqi Journal of Industrial Research 10, no. 1 (June 14, 2023): 120–30. http://dx.doi.org/10.53523/ijoirvol10i1id278.

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The objectives of the present study were undertaken to prepared hydroxyapatite powder from seashell and convert this to nano size and then added to gold nanoparticles. Materials and Methods: The seashells was cleaned and the phosphoric acid was added. The product was inserted in oven then calcined in the muffled furnace, to evaporate CO2 and getting the white crystalline powder which indicated presence of hydroxyapatite. This powder was converted to nanoparticle. Gold 1% mixed with prepared seashell nano hydroxyapatite. The characteristics of the prepared nano hydroxyapatite from seashell, were studied by the FTIR infrared spectrophotometer. The most biocompatible nano hydroxyapatite estimation by chemical test and examine prepared nano hydroxyapatite from seashell alone or when mixed with gold 1% in vivo to detect the effectiveness on reparing bone defect in mandibulare rabbits. Results: The results of an infrared measurement (FTIR Spectroscopy) for prepared nano hydroxyapatite showed that the chemical structure and band have the same FTIR spectrum of standard nano hydroxyapatite and have the same nano traits as the chemical test showed a yellow precipitation consisting in the nHA seashells. As an indication of biocompatibility and increase Bone Mineral Density by repairing bone defect in rabbits. And when added gold to nano hydroxyapatite, increased the efficacy of bone remodeling and repair bone. Conclusions: The possibility of preparing nanoparticles for hydroxyapatite from seashell are simple and inexpensive feedstock's and can be successfully produced by chemical precipitation technology from seashells with a phosphoric acid solution.
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Zhu, Yunpeng, Da Chen, Xiaotong Yu, Ruiwen Liu, and Yingdi Liao. "Properties of Cementitious Materials Utilizing Seashells as Aggregate or Cement: Prospects and Challenges." Materials 17, no. 5 (March 6, 2024): 1222. http://dx.doi.org/10.3390/ma17051222.

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Nowadays, the sustainable development of the construction industry has become a focus of attention. Crushing and grinding waste seashells originating from the fishery industry, such as oyster shells, cockle shells, mussel shells, and scallop shells, into different particle sizes for usage as aggregate and cement in concrete or mortar provides an effective and sustainable solution to environmental problems by reducing natural resource dependence. Numerous studies have attempted to analyze the suitability of waste seashell as a possible alternative to natural aggregates and cement in concrete or mortar. This paper presents an up-to-date review of the characteristics of different types of waste seashell, as well as the physical, mechanical, durability, and other notable functional properties of seashell concrete or mortar. From the outcome of the research, waste seashell could be an inert material, and it is important to conduct a series of proper treatment for a better-quality material. It is also seen from the results that although the mechanical properties of seashell concrete have been reduced, they all meet the required criteria set by various international standards and codes. Therefore, it is recommended that the replacement of seashells as aggregate and cement should not exceed 20% and 5%, respectively. Seashell concrete or mortar would then have sufficient workability and strength for non-structural purposes. However, there is still a lack of investigation concerning the different properties of reinforced concrete members using seashells as the replacement of aggregate or cement. Further innovative research can solidify its utilization towards sustainable development.
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Jasni, Sofia Adibah, Khairunisa Muthusamy, Hanis Nadiah Ruslan, Hussein Hamada, and Ezahtul Shahreen Ab Wahab. "Use of Seashell as Cement Replacement in Construction Material: A Review." CONSTRUCTION 4, no. 1 (March 3, 2024): 7–20. http://dx.doi.org/10.15282/construction.v4i1.10001.

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Growing construction industry boost cement manufacturing industry which consume a large amount of natural resources and releases greenhouse gases during cement production affects the environment. A lot of researchers attempt to find alternatives in integrating waste into concrete mixes and can be reused in cementitious construction material. Seashells are one of the waste materials that would give harm to their own biodiversity as it would occupy the landfills and seashores. Seashell is known to be very hard and protective on the outer layer produced by an animal that lives in the sea. This review paper is focused in using seashells as cement replacements in construction material. This academic review paper examines the potential of utilizing seashells, including various types such as a cockle, clam, oyster, and scallop as a sustainable and environmentally beneficial alternative to traditional usage in construction. By exploring the practical applications and economic viability of seashell-based concrete, this research aims to contribute to the broader discourse on eco-friendly construction practices and sustainable resources utilization in the construction industry.
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Kumar, Kiran, Vineetha Anil, Sara Hamed, and Ruwa Malik. "Investigating possibilities for using sea shell on compressive strength properties of concrete." International Journal of Engineering & Technology 7, no. 1.8 (March 1, 2018): 241. http://dx.doi.org/10.14419/ijet.v7i1.9399.

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The reason of this attempt was to demonstrate that seashells can be utilized as a partial replacement for fine aggregate in concrete for enhancing strength properties. Since seashells are widely available everywhere in coastal and seashore areas, and some of the concrete materials cannot be found easily everywhere. The strategies utilized as a part of this attempt was to replace burnt and crushed seashells with fine aggregate at 10%, 20% and 30% and compare it with each other and the traditional Ordinary Portland Cement concrete regarding mechanical properties following 7 and 28 days. In conclusion, despite the fact that seashells are generally accessible and can be effortlessly gathered from seashore and beach front regions, the process of burning and crushing requires a lot of energy and is tedious. In spite of the fact that the results demonstrated that utilizing 20% seashell to fine aggregate substitution has a somewhat higher in compressive and flexural properties than that of Ordinary Portland Cement concrete.
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Gärtner, Stefanie, Angelina Graf, Carla Triunfo, Davide Laurenzi, Stefan M. Schupp, Gabriele Maoloni, Giuseppe Falini, and Helmut Cölfen. "Turning Seashell Waste into Electrically Conductive Particles." International Journal of Molecular Sciences 23, no. 13 (June 29, 2022): 7256. http://dx.doi.org/10.3390/ijms23137256.

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Biomaterials such as seashells are intriguing due to their remarkable properties, including their hierarchical structure from the nanometer to the micro- or even macroscopic scale. Transferring this nanostructure to generate nanostructured polymers can improve their electrical conductivity. Here, we present the synthesis of polypyrrole using waste seashell powder as a template to prepare a polypyrrole/CaCO3 composite material. Various synthesis parameters were optimized to produce a composite material with an electrical conductivity of 2.1 × 10−4 ± 3.2 × 10−5 S/cm. This work presents the transformation of waste seashells into sustainable, electronically conductive materials and their application as an antistatic agent in polymers. The requirements of an antistatic material were met for a safety shoe sole.
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Abutu, J., S. A. Lawal, M. B. Ndaliman, R. A. Lafia-Araga, and A. S. Abdulrahman. "Effects of Particle Size Distribution on the Properties of Natural-Based Composite." International Journal of Engineering Materials and Manufacture 4, no. 4 (December 11, 2019): 170–77. http://dx.doi.org/10.26776/ijemm.04.04.2019.05.

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In this study, locally sourced natural materials (coconut shells and seashells) were used separately to produce composites. The powders were sieved with sieve size of 10 µm and characterized using a particle size analyser (DLS) in order to ascertain their particle size distribution. Also, the effects of particle size distribution on the performance of sourced coconut shells and seashells-based composite was investigated. About 52% of the characterized powder was afterward used along with other ingredients (35% binder, 8% alumina and 5% graphite) to produced composites using moulding pressure (14 MPa), moulding temperature (160 ºC), curing time (12 min) and heat treatment time (1 hr). The performance of the composites was thereafter evaluated using standard testing procedures. The results of particle size analysis indicated that the seashell powder (0.27) possesses lower distribution width (PDI) compared to the coconut shell powder (0.342) while the coconut shell (542.3 nm) showed lower Z-average diameter compared to the seashell powder (1096 nm) with some little traces of nanoparticles (<10 µm). Also, the experimental results obtained from composite characterization indicated that the coconut shell-based samples exhibited better performance in terms of its mechanical and tribological properties compared to the seashell-based samples.
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Leiva-Vega, Javier, Carolina Shene, and Danela Silva-Ferrer. "OPTIMIZATION OF NEUTRALIZING POWER OF Mytilus chilensis SEASHELLS IN ACID ALLUVIAL SOIL OF ÑUBLE COAST." Chilean journal of agricultural & animal sciences 39, no. 2 (2023): 210–16. http://dx.doi.org/10.29393/chjaa39-18onjd30018.

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Seashells, residues from mussel (Mytilus chilensis), Hupé 1854 processing, are an environmental load on the coasts of southern Chile. The main component of this waste is calcium carbonate, which is commonly used to neutralize soil acidity. Its application in meadows is limited due to the large quantities (tons) required. The objectives of this work were to determine the most appropriate type of mussel seashells (M. chilensis) as a source of calcium carbonate (CaCO3) for pH neutralization of an alluvial acidic soil collected from Ñuble Coast, and to identify its optimal dose. The seashell doses were optimized using response surface methodology (RSM) to achieve a soil pH close to neutral and a relatively high neutralizing power, which was defined in comparison to the pH increase achieved with commercial CaCO3. Seashells with organic matter was the most suitable formulation for increasing soil pH with a high relative neutralizing power (94%), requiring a dose of 23% (w/w) to achieve soil pH values close to neutral. The fitted quadratic model explains 98.9% of variation inexperimental data. This work lays the foundations for future studies aimed to find new agricultural and/or livestock applications of wastes from the shellfish industry.
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Fowler, Deborah R., Hans Meinhardt, and Przemyslaw Prusinkiewicz. "Modeling seashells." ACM SIGGRAPH Computer Graphics 26, no. 2 (July 1992): 379–87. http://dx.doi.org/10.1145/142920.134096.

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Dissertations / Theses on the topic "Seashells"

1

Trapnell, Rose Maria. "Ali Seashells." Thesis, Queensland University of Technology, 1998.

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Twelve year old Ali is no ordinary girl. Even before she reaches high school her :friends are starting to change, old allegiances are breaking up, and the balance of power between those in her group is shifting. The pressure is on to conform. But if Ali does she risks losing the very thing that keeps her centred. Should she offer up her ability to morph into a dolphin in order to fit in with the group?
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2

Khalifa, Anissa. "Etude des propriétés mécaniques et de rupture d'un biocomposite à base de particules de coquillages de mer élaboré par fabrication additive." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDENGSYS/2023/2023ULILN050.pdf.

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Des filaments de biocomposites PLA chargés de particules de coquillages de mer (Huître et Moule) ont été réalisés par extrusion avec quatre taux de fraction massique de particules (5%, 10%, 15%, 20%) de granulométrie inférieure à 160 microns. Ces filaments ont été utilisés pour la fabrication additive (FA) en dépôt fondu (Fused Deposition Modeling FDM) d'éprouvettes. Des essais de caractérisation thermiques et mécaniques ont été réalisés pour comprendre le comportement de ces filaments avant leur utilisation en impression. Des observations tomographiques par rayon X mettent en évidence la distribution des particules de coquillages de mer dans la matrice PLA. Des observations de faciès de rupture par microscope sont présentées. Enfin, des analyses thermogravimétriques sont réalisées et analysées.Une stratégie d'impression a été développée pour étudier l'effet des paramètres d'impression, tels que l'angle de remplissage, l'épaisseur de couche, la température d'impression et la vitesse d'impression, sur les propriétés mécaniques des biocomposites. L'objectif a permis d'identifier les paramètres optimaux permettant d'obtenir les meilleures propriétés mécaniques sur les éprouvettes haltères (norme ASTM D638) imprimées Les résultats obtenus révélent une dispersion significative, notamment en ce qui concerne la déformation à la rupture. Une étude de la rupture sur éprouvettes SENT (Single Edge Notched Tension) imprimées avec deux angles de remplissage différents (+45/-45°, 0°/90°) a été réalisée pour déterminer la ténacité des biocomposites fabriqués en couplant les essais de traction monotone avec la méthode de corrélation d'images numériques (CIN). Cette approche a permis d'obtenir une meilleure compréhension des comportements mécaniques des biocomposites et de caractériser leur résistance à la rupture
Filaments of PLA biocomposites loaded with seashell particles (Oyster and Mussel) were produced by extrusion with four mass fraction rates of particles (5%, 10%, 15%, 20%) with particle sizes less than 160 microns. These filaments were used for additive manufacturing (AM) in Fused Deposition Modeling (FDM) of test specimens. Thermal and mechanical characterization tests were conducted to understand the behavior of the filaments before their use in printing. X-ray tomographic observations highlight the distribution of seashell particles in the PLA matrix. Microscope observations of fracture surfaces are presented. Finally, thermogravimetric analyses are performed and analyzed.A printing strategy was developed to study the effect of printing parameters such as infill angle, layer thickness, printing temperature, and printing speed on the mechanical properties of the biocomposites. The objective was to identify the optimal parameters for obtaining the best mechanical properties on printed dumbbell-shaped specimens (ASTM D638 standard). The results obtained reveal significant dispersion, especially in terms of elongation at break. A fracture study on SENT (Single Edge Notched Tension) specimens printed with two different infill angles (+45/-45°, 0°/90°) was conducted to determine the toughness of the biocomposites by coupling monotonic tensile tests with Digital Image Correlation (DIC) method. This approach provided a better understanding of the mechanical behaviors of the biocomposites and characterized their fracture resistance
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Yourdkhani, Mostafa. "Multiscale modeling and optimization of seashell structure and material." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66991.

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The vast majority of mollusks grow a hard shell for protection. Typical seashells are composed of two distinct layers, with an outer layer made of calcite (a hard but brittle material) and an inner layer made of a tough and ductile material called nacre. Nacre is a biocomposite material that consists of more than 95% of tablet-shape aragonite, CaCO3, and a soft organic material as matrix. Although the brittle ceramic aragonite composes a high volume fraction of nacre, its mechanical prop-erties are found to be surprisingly higher than those of its constituents. It has been suggested that calcite and nacre, two materials with distinct structures and proper-ties, are arranged in an optimal fashion to defeat attacks from predators. This re-search aims at exploring this hypothesis by capturing the design rules of a gastro-pod seashell using multiscale modeling and optimization techniques. At the mi-croscale, a representative volume element of the microstructure of nacre was used to formulate an analytical solution for the elastic modulus of nacre, and a multiax-ial failure criterion as a function of the microstructure. At the macroscale, a two-layer finite element model of the seashell was developed to include shell thick-ness, curvature and calcite/nacre thickness ratio as geometric parameters. The maximum load that the shell can carry at its apex was obtained. A multiscale op-timization approach was also employed to evaluate whether the natural seashell is optimally designed. Finally, actual penetration experiments were performed on red abalone shells to validate the results.
Une vaste majorité des mollusques développent une coquille dure pour leur pro-tection. Une coquille typique est constitué de deux couches distinctes. La couche externe est faite de calcite (un matériau dur mais fragile), tandis que la couche in-terne est composée de nacre, un matériau plus résiliant et ductile. La nacre est un matériau biocomposite constitué de plus de 95% d'aragonite sous forme de ta-blette et d'un matériel organique souple qui forme la matrice. Bien que la cérami-que aragonite constitue une grande portion de la nacre, ses propriétés mécaniques sont étonnamment plus élevées de celles de ses constituants. La calcite et la nacre, deux matériaux avec des propriétés et des structures différentes, sont supposément étalonnées de façon optimale pour combattre les attaques de prédateurs. Cette étude cherche à déterminer les règles de construction d'une coquille de gastropode en utilisant la modélisation multi-échelle et des techniques d'optimisation. À l'échelle microscopique, un volume représentatif de la microstructure de la nacre a été utilisé pour formuler une solution analytique de son module d'élasticité et un critère de fracture multiaxial fonction des dimensions de la microstructure. À l'échelle macroscopique, un modèle d'éléments finis à deux couches de la co-quille à été utilisé pour représenter la curvature et le ratio calcite/nacre en fonction des paramètres géométriques. La charge maximale que la coquille peut supporter à son apex a été déterminée. Une approche d'optimisation multi-échelle a aussi été employée pour évaluer la reconstruction optimale du coquillage naturel. Fina-lement, plusieurs tests ont été effectués sur une coquille d'abalone rouge pour valider les résultats.
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Villarreal, Julián Enrique. "Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/42164.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, June 2007.
Includes bibliographical references ( p. 22).
Positionally-sensitive nanoindentation was carried out in the freshly-cleaved nacre found in the shell of the gastropod mollusk Trochus niloticus. Nacre is a hierarchical biocomposite composed of mineral tablets of 95 weight % calcium carbonate (CaCO3) in the aragonite mineral form and a biomacromolecular organic matrix. Nanoindentation was carried out in a pattern of square grids of 256 indents at maximum loads of 1 mN and 500 gN. The average elastic modulus and hardness for the 1 mN indents were found to be 97.8 GPa + 6.41 GPa and 5.41 GPa ± 0.49 GPa, respectively, and for the 500 gN indents average elastic modulus of 94.8 GPa ± 7.28 GPa and hardness of 4.89 GPa ± 0.53 GPa. Maps of the 2-D spatial distribution of elastic modulus and hardness for the indent areas were generated. Tapping mode Atomic Force Microscopy was performed on the indented nacre after a treatment of surface etching, which revealed the tablet boundaries in order to correlate qualitatively the topographical features with the properties distribution. The properties distribution maps revealed a non-uniform distribution of nanomechanical properties as well as highly-localized regions in which the values of the properties differed from the average values. Future studies may point to a direct correlation between structural heterogeneity and the properties distribution.
by Julián Enrique Villarreal.
S.B.
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Tanner, Kathryn Cavanaugh. "Networks and economic exchange : the international political economy of the seashell trade between Tanzania and India." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612835.

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Johnson, Tommy J. "Seasheds, a sealift enhancement feature : an analysis of methods employed for lifting DoD's outsize cargo /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from the National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA274902.

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7

Arslan, Selcuk Semra. "Proposal For A Non-dimensional Parametric Interface Design In Architecture: A Biomimetic Approach." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610478/index.pdf.

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Biomimesis, the imitation of animate and inanimate forms in nature to inspire new designs, is term introduced in the 20th century. The concept that there exist models and solutions in nature that may improve and optimize the way mankind lives has been the subject of much discussion. Although biomimesis as a well-defined discipline is a relatively recent concept, modeling nature is as old as mankind itself and can be seen in many different forms in all aspects of life. In the field of architecture there have been several designs created by imitating/modeling or aspiring to forms in nature. Most of the &ldquo
end products&rdquo
of these processes can be considered as milestones in the history of architecture, with their innovative form, structure, and construction techniques, and have resulted in developments in many fields through the pioneering of new and successful designs. The implementations of the concept of Biomimesis in the field of architecture are mostly observed in the design of forms. In the proposed study, besides those forms, structural behavior and the optimized response to internal and external loads of these forms, together with their geometrical configurations, have been studied to provide a methodology to understand relationships in nature for optimized structures and in the further steps a system design has been aimed. Within the frame work of methodology, in the first part of the study, form/structure groups in animate and inanimate nature are classified and their representative characteristics are discussed. The next part focuses on the &ldquo
shell&rdquo
, as a case to exemplify the proposed methodology. For this reason, the &ldquo
seashell&rdquo
form is chosen to explore the forms/structures in architecture. For this purpose, initially the definitions of a shell and its implementations in architecture have been examined and the &ldquo
real problem&rdquo
has been described: what are the codes in architecture to understand the language of shells in nature and how this knowledge can be translated to man made design. The modeling approaches of the researchers working on the seashells have been examined and parameters developed to generate a mathematical model closer to a real shell. A program has been written to generate the computational model of selected seashell Turitella Terebra as a case. Through a series of abstractions/assumptions first mathematical then computational model of the actual seashell have been obtained to explore the behavioral properties of shells. In the experimental part of the study, 86 shells have been exposed to compression tests, similar boundary conditions and loads have been applied to the computational model in two different FEA software, to compare simulation results with the experimental ones in order to check the precision and efficacy of the computational model. The results have been analyzed and a number of non-dimensional parameters are obtained. It is believed that potential relations in the realm of architecture regarding such non dimensional parameters would be a new era to talk new design methods and to construct optimized structures. Through this perception/thinking/designing/manufacturing method a platform would be formed to discuss the concept of Biomimesis in architecture subjectively.
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Jerhov, Carolina. "IN LARGE SCALE : the art of knitting a small shell in large scale." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-26582.

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This work places itself in the field of knitted textile design and the context of body and interior. The primary motive is to investigate the tactile and visual properties of oysters and pearls, inspired by Botticelli’s painting Venus. The aim is to explore free-flowing and texture through knitted three-dimensional textile surfaces. Material and colour choices have been made based on the source of inspiration, the oyster, and investigated on industrial circle knit and flat knit machines. The circle knit’s expression has been explored from a hand knitting perspective, using the manual elements to push the machine’s technique to design new expressions. The result of the project is a collection that has four suggestions for a knitted, three-dimensional surface, each inspired and developed from one specific part of the oyster; the shell, the nacre, the flesh, and the pearl. This work investigates the potential of using circle knit machines, commonly used in fast fashion for bulk production, as a tool for handicraft and higher art forms. The final collection pushes the conversation regarding the future uses of the knitting machines and investigates how rigid objects can be expressed through the flexible structure.
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Desiato, Pietro. "Memorie, supporting the practices of memory in the graveyard." Thesis, Malmö högskola, Institutionen för konst, kultur och kommunikation (K3), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-23228.

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Due to its sensitive nature, the graveyard is often an avoided problem space within the field of design. This becomes evident from the lack of exploration and analysis in this domain. Anyhow, it represents an opportunity to test how design can mediate between sacred places, technology and people. Moreover, as a very specific context, the graveyard encompasses peculiar ways of interacting and experiencing space that deserve to be taken into account. This work discusses the notions of space and place and how the field of interaction design can benefit from them. In doing so, it investigates the hidden dimensions of the graveyard that make it a complex structure where spatial, personal and socio-cultural dimensions are intertwined. While the fieldwork aims at analysing the graveyard in its different tones of meaning (identity, memorial, cultural differences, on-site interaction) the focus of the work are the practices of memory and the role that the past has in our relation with the deceased. The result of the design process is an interactive audio system composed of a playback circuit based on Arduino and boxed into a seashell. The device is designed to be placed on the grave and store audio content. Once activated, the audio seashell allows listening and eventually recording vocal traces related to the deceased’s past. Taking into account the observed practices, rules and conventions that shape the graveyard, the role of personal and collective rituals and the meanings of all the identified artifacts, the designed system supports the experience of recalling memories in respect to the atmosphere, tempo and rhythm that characterise the graveyard.
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Akella, Kiran. "Studies for Design of Layered Ceramic Armour Inspired by Seashells." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3768.

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Pearly layers in seashells, also known as nacreous layers, are reported to be three orders of magnitude tougher than their primary constituent, aragonite. Their high toughness is attributed to a particular structure of alternating layers of natural ceramic and polymer materials. This work tries to emulate it using engineering materials. The thickness, strength, and stiffness of the ceramic layer; the thickness, stiffness, strength, and toughness of the polymer interface layer; and the number of layers are the factors that contribute to different degrees. Furthermore, understanding the relative contribution of different toughening mechanisms in nacre would enable identification of key parameters to design tough engineered ceramics. As a step towards that, in this thesis, layered ceramic beams replicating nacre were studied analytically, computationally, and experimentally. The insights and findings from these studies were then used to develop a new method to make tough layered ceramics mimicking nacre. Subsequently, the use of layered ceramics for armour applications was evaluated. Based on analytical numerical and experimental studies, we observed that the strength of the layers is a key factor to replicate the high toughness of nacre in engineered ceramics. We also demonstrated that, crack deflection and bridging observed in nacre in studies elsewhere, occur due to the high strength of platelets. Based on these findings, the new method developed in this study uses green alumina-based ceramic tapes stacked with screen printed stripes of graphite. During sintering, graphite oxidizes leaving empty channels in the stack. These channels were filled with tough interface materials afterwards. As a result, a ceramic- polymer composite with more than 2-fold increase in toughness was developed. Subsequently, we evaluated layered ceramics for armour applications based on numerical analysis validated with experiments. Consistent to the trends in literature, we observed that layers degrade the resistance to ballistic impact. However, improved energy absorption is demonstrated in layered ceramics. These conflicting dual trends were not presented and quantified in any earlier studies conducted elsewhere. Another new observation not documented earlier is the effect of interface strength. Using an interface material of sufficient strength, penetration resistance of layered ceramics can be improved beyond monolithic ceramics. Using these findings, new layered ceramic armour can be designed that is cost- effective and better performing than monolithic ceramics.
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Books on the topic "Seashells"

1

Emmett, Jennifer. Seashells. Washington, D.C: National Geographic Society, 1999.

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Seashells. New York: Golden, 1990.

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Seashells. New York: Children's Press, 2002.

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Seashells. Mankato, Minn: Creative Education, 1999.

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ill, Spence Jim, and Parker Earl ill, eds. Seashells. Racine, Wis: Western Pub. Co., 1991.

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Abbott, R. Tucker. Seashells. London: Zigzag, 2003.

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Zitwer, Barbara Jane. Seashells. New York, NY: Warner Books, 1995.

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Witherington, Dawn, and Blair E. Witherington. Florida's Seashells. Sarasota, Florida: Pineapple Press, Inc., 2007.

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Rhyne, Nancy. Carolina seashells. Orangeburg, S.C: Sandlapper Pub., 1989.

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Michael, Schoenfeld, and Weller Don, eds. Seashells & sunsets. [Park City, Utah]: Weller Institute for the Cure of Design, 1986.

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Book chapters on the topic "Seashells"

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Lockshin, Richard A. "The Seashells on the Mountaintop." In The Joy of Science, 35–44. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6099-1_3.

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Döpper, Stephanie. "Seashells." In The 2018 Archaeological Survey at Tawi Said, Sultanate of Oman, 59–67. Archaeopress Publishing Ltd, 2024. http://dx.doi.org/10.2307/jj.14416281.13.

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"She sells seashells." In Goldfish in the Parlour, 113–58. Sydney University Press, 2023. http://dx.doi.org/10.2307/j.ctv33jb63z.8.

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Wonderley, Anthony. "Wampum, Seashells, and Peace." In Origins of the Iroquois League, 174–83. Syracuse University Press, 2019. http://dx.doi.org/10.2307/j.ctvzgb7xh.11.

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"- From Seashells to Electrons." In Paying with Plastic. The MIT Press, 2004. http://dx.doi.org/10.7551/mitpress/5281.003.0004.

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Helmreich, Stefan, Sophia Roosth, and Michele Friedner. "Seashell Sound." In Sounding the Limits of Life. Princeton University Press, 2015. http://dx.doi.org/10.23943/princeton/9780691164809.003.0012.

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This chapter examines what sounds are generated from seashells. In his 1915 Book of Wonders, popular science writer Rudolph Bodmer explains that “the sounds we hear when we hold a sea shell to the ear are not really the sound of the sea waves. We have come to imagine that they are because they sound like the waves of the sea, and knowledge that the shell originally came from the sea helps us to this conclusion very easily.” Both sea and seashell sounds were generated by waves. This chapter suggests that the changing ratios of ocean, air, and blood in seashell-sound accountings track a European–Atlantic–American ethno-conchology, one that unrolls from Romantic enthrallment toward a double-edged modernity that uses the language of science to disenchant at one moment and then reenchant at another.
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"2. Seashells in the Appalachians." In American Enlightenments, 41–72. Yale University Press, 2020. http://dx.doi.org/10.12987/9780300224566-004.

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Mellor, Leo. "Burnt Pain and Blasted Seashells:." In Locating Lynette Roberts, 155–76. University of Wales Press, 2019. http://dx.doi.org/10.2307/jj.14491696.13.

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"Family Corbulidae – Basket Clams." In Seashells of Southern Florida, 382–87. Princeton University Press, 2021. http://dx.doi.org/10.2307/j.ctv1zm2v56.63.

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"Family Solemyidae – Awning Clams." In Seashells of Southern Florida, 30–34. Princeton University Press, 2021. http://dx.doi.org/10.2307/j.ctv1zm2v56.8.

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Conference papers on the topic "Seashells"

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Fowler, Deborah R., Hans Meinhardt, and Przemyslaw Prusinkiewicz. "Modeling seashells." In the 19th annual conference. New York, New York, USA: ACM Press, 1992. http://dx.doi.org/10.1145/133994.134096.

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M. S, Arya. "A Study on Cockle Seashell and Silicafume in Concrete." In The International Conference on scientific innovations in Science, Technology, and Management. International Journal of Advanced Trends in Engineering and Management, 2023. http://dx.doi.org/10.59544/lqia6252/ngcesi23p3.

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Efforts are made to incorporate by-products and their wastes from different industries as alternatives in concrete to reduce the need of virgin materials for construction purpose. Cement production is highly intensive and production cause tons of carbon dioxide (CO2) emission every year. To overcome this crisis, pozzolanic material such as silicafume is deployed. Also, the exploitation of nature by over consumption of aggregate is increasing day by day. Fishery waste such as cockle seashell which is usually dumped or landfilled without any re-use value can be used as a partial solution for ecological, economical and environmental problems. Experimental investigations have been carried out on the use of cockle seashell as aggregate replacement materials in concrete. Seashells were utilised as partial coarse aggregates in concrete with different percentages as 10%, 15%, 20% and 25% and silicafume with different percentages as 10%, 12%, 14% and 15% of cement. This study aims to evaluate the strength properties, durability and quality of concrete using Ultrasonic Pulse Velocity (UPV) test of normal and modified mix. Strength properties such as compressive strength, split tensile strength and flexural strength were conducted for normal and modified mix. However, proper treatment such as heating at a high temperature is desirable for a better quality seashell. This presents an overview of behaviour of the cockle seashells and silicafume in concrete. It shows a higher mechanical strength and better durability compared to conventional concrete.
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Scuderi, Giuliana. "Seashells and Oyster Shells: Biobased Fine Aggregates in Concrete Mixtures." In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.146.

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The construction industry is the largest global consumer of materials, among which sand plays a fundamental role; now the second most used natural resource behind water, sand is the primary component in concrete. However, natural sand production is a slow process and sand is now consumed at a faster pace than it’s replenished. One way to reduce consumption of sand is to use alternative materials in the concrete industry. This paper reports the exploratory study on the suitability of aquaculture byproducts as fine aggregates in concrete mixtures. Seashell grit, seashell flour and oyster flour were used as sand replacements in concrete mixtures (10%, 30% and 50% substitution rates). All the mixtures were characterized in fresh and hardened states (workability, air content, compressive strength and water absorption). Based on compressive strength, measured at 7 and 28 days, seashell grit provided the most promising results: the compressive strength was found to be larger than for conventional concrete. Moreover, the compressive strength of the cubes was larger, when larger percentages of seashell grit were used, with the highest value obtained for 50% substitution. However, for oyster flour and seashell flour, only 10% sand substitution provided results comparable with the control mixture. For the three aggregates, workability of concrete decreases with fineness modulus decrease. For mixtures in which shell and oyster flour were used with 30% and 50% substitution percentages, it was necessary to increase the quantity of mixing water to allow a minimal workability. In conclusion, considering the promising results of the seashell grit, it is suggested to study further the characteristic of the material, also considering its environmental and physical properties, including acoustic and thermal performances. Higher substitution percentages should also be investigated. This research adds to the relevant literature in matter of biobased concrete, aiming at finding new biobased sustainable alternatives in the concrete industry.
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Ibrahim, Ahmmed Saadi, Mazhar Ul-Islam, Mohammed Shariq, Afrah AL-Salmi, Shorooq AL-Abri, Amani AL-Noobi, and Osama Nadhom Nijris. "Utilization of seashells to improve mechanical properties of cement." In 1ST SAMARRA INTERNATIONAL CONFERENCE FOR PURE AND APPLIED SCIENCES (SICPS2021): SICPS2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0121740.

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Yourdkhani, M., D. Pasini, and F. Barthelat. "The hierarchical structure of seashells optimized to resist mechanical threats." In DESIGN AND NATURE 2010. Southampton, UK: WIT Press, 2010. http://dx.doi.org/10.2495/dn100131.

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Singh, Pulkit, Jordan Ferre, Bridget Thrasher, Khalid Al-Ramadan, Dave L. Cantrell, Daniel Lehrmann, Michele Morsilli, and Jonathan Payne. "SEASHELLS THROUGH TIME: A PHANEROZOIC RECORD OF THE ABUNDANCE OF SKELETAL ORGANISMS." In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-393859.

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EL BEKKAYE, Khalid, and Mohammed MELHAOUI. "The malacological fauna of bivalve seashells of the Mediterranean coast of Morocco." In Conférence Méditerranéenne Côtière et Maritime - Coastal and Maritime Mediterranean Conference. Editions Paralia, 2011. http://dx.doi.org/10.5150/cmcm.2011.067.

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Desmond, Seow, Denni Kurniawan, and Fethma M. Nor. "Synthesis of hydroxyapatite from seashells via calcination at various temperature using microwave and furnace." In THE 5TH INTERNATIONAL CONFERENCE ON INDUSTRIAL, MECHANICAL, ELECTRICAL, AND CHEMICAL ENGINEERING 2019 (ICIMECE 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000902.

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"The Preparation and Characterization of Banana Peels, Eggshells, and Seashells for The Treatment of Wastewater." In Nov. 16-17, 2023 Johannesburg (South Africa). International Institute of Chemical, Biological & Environmental Engineering (IICBEE), 2023. http://dx.doi.org/10.17758/iicbe5.c1123025.

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Liu, Y., M. Lott, S. F. Seyyedizadeh, I. Corvaglia, G. Greco, V. F. D. Poggetto, A. Gliozzi, et al. "Multiscale Mechanical Study of Marine Seashells and Possible Consequences in The Design of Bioinspired Materials." In 10th Convention of the European Acoustics Association Forum Acusticum 2023. Turin, Italy: European Acoustics Association, 2022. http://dx.doi.org/10.61782/fa.2023.1062.

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Reports on the topic "Seashells"

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Picado, Jorge. Seashells: the Plainness and Beauty of Their Mathematical Description. Washington, DC: The MAA Mathematical Sciences Digital Library, March 2009. http://dx.doi.org/10.4169/loci003294.

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Feuillade, Christopher, Mel D. Wagstaff, and Roger W. Meredith. A Simple Acoustic Scattering Model for Ensembles of Rocks and Seashells Lying on the Ocean Floor. Fort Belvoir, VA: Defense Technical Information Center, July 1998. http://dx.doi.org/10.21236/ada351121.

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