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Artykuły w czasopismach na temat „Shell length”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Silalahi, Torang J. P., and Cyska Lumenta. "Morphometric measurements of pearl shell shells Pinctada margaritifera for aquarium cultivation." Jurnal Moluska Indonesia 6, no. 2 (2022): 54–58. https://doi.org/10.54115/jmi.v6i2.55.

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The pearl oyster Pinctada margaritifera or the black-lipped oyster is one of the important species used in the pearl industry. The availability of natural pearl oyster seeds is limited, while exploitation is increasing. The purpose of this field work practice is to measure and observe the morphometric comparisons of Arakan, Mantehage Bango and Talengen waters. The time for the implementation of the field work practice begins in January 2020. This field work practice is carried out at the Mamuaya family work laboratory, Malalayang. The method used in this field work practice is a method of dire

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Sant'Anna, Bruno S., Cilene M. Zangrande, Alvaro L. D. Reigada, and Marcelo A. A. Pinheiro. "Shell utilization pattern of the hermit crab Clibanarius vittatus (Crustacea, Anomura) in an estuary at São Vicente, State of São Paulo, Brazil." Iheringia. Série Zoologia 96, no. 2 (2006): 261–66. http://dx.doi.org/10.1590/s0073-47212006000200018.

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We evaluated the gastropod shell utilization pattern of the hermit crab Clibanarius vittatus (Bosc, 1802) at Pescadores Beach in São Vicente, State of São Paulo, Brazil. Specimens were collected monthly from May 2001 through April 2003, in the intertidal zone at low tide. The crabs were weighed and their carapace shield length measured. All gastropod shells were identified and had their shell biometric parameters (total length and aperture length) measured (mm) and weighed (g). A total of 2,344 hermit crabs (644 males, 1,594 females, 45 ovigerous females and 61 individuals in intersex), using

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Li, Shou-Chao, Yu-Chen Zhang, Le Chang, Chang-Yu Zhou, and Xiao-Hua He. "Research on Buckling Load of Cylindrical Shell with an Inclined through Crack under External Pressure and Its Solution." Metals 13, no. 1 (2023): 174. http://dx.doi.org/10.3390/met13010174.

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In order to evaluate the reliability of cracked cylindrical shell effectively and reasonably, study the load capacity of cracked structures and understand the failure modes of cracked structures, in this paper the finite element method is adopted for cylindrical shells with mixed mode crack. The finite element models of cylindrical shell with an inclined through crack under external pressure were established by finite element method, the elastic and elastic-plastic buckling loads were calculated. The influences of crack length (c), crack angle (θ), cylindrical shell length-radius ratio (L/R),

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Matos, Alisson Sousa, Helena Matthews-Cascon, and Oscar R. Chaparro. "Morphometric analysis of the shell of the intertidal gastropod Echinolittorina lineolata (d'Orbigny, 1840) at different latitudes along the Brazilian coast." Journal of the Marine Biological Association of the United Kingdom 100, no. 5 (2020): 725–31. http://dx.doi.org/10.1017/s0025315420000624.

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AbstractMorphometric analysis is one of the tools widely used to quantify, analyse and describe the variations in the biological forms of animals. In this study, we examined the linear morphometric variations of the shell of the small intertidal gastropod Echinolittorina lineolata and compared the patterns to identify variations among populations and between sexes. The individuals were collected from latitudes 3°S, 14°S, 21°S and 23°S along the Brazilian coast. Traditional morphometric analysis was performed, and the morphometric variables of the shells, namely, the length and width of the she

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5

IDRIS, MOHD HANAFI, MUHAMMAD ATIF AWANG, ABU HENA MUSTAFA KAMAL, et al. "SYMBIOTICALLY SNAPPER SHRIMP ANCHISTUS CUSTOIDES BRUCE, 1977 (DECAPODA: PALAEMONIDAE) INHABITING THE MANTLE CAVITY OF THE PEN SHELL (BIVALVIA: PINNIDAE)." JOURNAL OF SUSTAINABILITY SCIENCE AND MANAGEMENT 17, no. 10 (2022): 136–48. http://dx.doi.org/10.46754/jssm.2022.10.010.

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Snapper shrimp is a symbiotic organism usually hidden under the rocks, sponges and pen shells in the seagrass and coral habitats. The relationship study within snapper shrimp and pen shell was conducted from Merambong shoal, one of the biggest seagrass beds in peninsular Malaysia. A total of 40 individual pen shells were collected randomly and four species of pen shells were identified. 40 Anchistus custoides were found inhabiting symbiotically in the mantle cavity of the pen shell as solitary males and females and heterosexual pairs. Pen shell, Pinna bicolor and Atrina vexillum recorded the h

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6

Mohd, Hanafi Idris, Atif Awang Muhammad, Hena Mustafa Kamal Abu, et al. "Symbiotically snapper shrimp Anchistus custoides Bruce, 1977 (Decapoda: Palaemonidae) inhabiting the mantle cavity of the pen shell (Bivalvia: Pinnidae)." Journal of Sustainability Science and Management 17, no. 10 (2022): 136–48. https://doi.org/10.46754/jssm.2022.10.010.

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Snapper shrimp is a symbiotic organism usually hidden under the rocks, sponges and pen shells in the seagrass and coral habitats. The relationship study within snapper shrimp and pen shell was conducted from Merambong shoal, one of the biggest seagrass beds in peninsular Malaysia. A total of 40 individual pen shells were collected randomly and four species of pen shells were identified. 40 Anchistus custoides were found inhabiting symbiotically in the mantle cavity of the pen shell as solitary males and females and heterosexual pairs. Pen shell, Pinna bicolour and Atrina vexillum recorded the

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7

Martel, André, Teresa M. Hynes, and John Buckland-Nicks. "Prodissoconch morphology, planktonic shell growth, and size at metamorphosis in Dreissena polymorpha." Canadian Journal of Zoology 73, no. 10 (1995): 1835–44. http://dx.doi.org/10.1139/z95-216.

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Larval shell morphology and morphometry of the zebra mussel, Dreissena polymorpha, were examined using scanning electron and light microscopy. Larval shell morphology is typical of bivalves having planktotrophic development. The prodissoconch I (PI) has a pitted-punctate surface contrasting markedly with the conspicuous fine concentric or commarginal lines of the prodissoconch II (PII) and dissoconch (D) shells. Length-frequency distributions of the prodissoconch, which were obtained from disarticulated valves of bleached early juveniles (0.5–2 mm) (specimens from west-central Lake Erie), indi

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8

Allsay, Kitsash Addifisyukha Cintra, and Eny Djoko Setyono Dwi. "Shell morphology and size distribution of Turbo spp in Sepanjang Beach by shell collecting: An Initial Survey." BIO Web of Conferences 70 (2023): 03003. http://dx.doi.org/10.1051/bioconf/20237003003.

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Turbo spp. in Sepanjang Beach, Gunung Kidul, Indonesia, are at risk of depletion due to their popularity for consumption and decoration. Protecting this species demands sustainable management practices. This initial survey aimed to examine the shell morphology, size distribution, and shell growth patterns of Turbo spp. at Sepanjang Beach, Indonesia, to establish baseline data for future research. A total of 233 shells were collected randomly and analyzed for morphological parameters. Shell dimensions exhibited variations in size, shape, color, and whorl features. Shells ranged from 7.59 to 60.

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Goodsell, J. G., S. C. Fuller, A. G. Eversole, M. Castagna, and R. A. Lutz. "Larval and early postlarval shell morphology of several venerid clams." Journal of the Marine Biological Association of the United Kingdom 72, no. 1 (1992): 231–55. http://dx.doi.org/10.1017/s0025315400048906.

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Shell morphological features of the larvae and early postlarvae of species from two venerid (Mollusca: Lamellibranchia) subfamilies, Chioninae (Mercenaria mercenaria, M. campechiensis, M. campechiensis texana and Chionecancellata) and Pitarinae (Pitar morrhuanus), were examined using scanning electron microscopy. A single elongated fold on the anterior half of the left valve became more robust and a small fold in the centre of the right valve increased in length along the hinge line throughout the larval period. A MANOVA of shell length, shell height and provinculum length detected statistical

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10

Nwoji, C. U., D. G. Ani, O. A. Oguaghamba, and V. T. Ibeabuchi. "Static Bending of Isotropic Circular Cylindrical Shells Based on the Higher Order Shear Deformation Theory of Reddy and Liu." International Journal of Applied Mechanics and Engineering 26, no. 3 (2021): 141–62. http://dx.doi.org/10.2478/ijame-2021-0041.

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Abstract In this paper, a displacement based shear deformation theory formulated on the cubic in-plane displacement field equation of Reddy and Liu is presented for the static bending analysis of isotropic circular cylindrical shells. The adopted displacement field accounts for a quadratic (parabolic) distribution of the transverse shear through the shell thickness as well as satisfies the need for a stress free upper and lower boundary surfaces of the shell. The equations of static equilibrium are obtained on application of the principle of virtual work. Numerical results of the bending analy

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11

Turra, Alexander, and Fosca P. P. Leite. "Shell utilization patterns of a tropical intertidal hermit crab assemblage." Journal of the Marine Biological Association of the United Kingdom 82, no. 1 (2002): 97–107. http://dx.doi.org/10.1017/s0025315402005210.

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The shell selection and utilization patterns of three sympatric hermit crab populations (Clibanarius antillensis, C. sclopetarius, and C. vittatus) and shell availability were studied in a tropical intertidal low energy area. Shell availability (except for C. antillensis) was low and the hermit crabs showed overlap in size (mainly C. sclopetarius and C. vittatus). The influence of shell availability and selection on shell use was dependent on crab species. Clibanarius antillensis used mainly shells of Cerithium atratum, the most available shell species, while Clibanarius sclopetarius and C. vi

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12

Wang, Zhuo-Wu, Jian Tang, Shou-Chao Li, Xiao-Hua He, and Chang-Yu Zhou. "Research on Elastic and Elastic-Plastic Buckling Load of Cylindrical Shell with an Inclined through Crack under Axial Compressive Load." Materials 16, no. 18 (2023): 6123. http://dx.doi.org/10.3390/ma16186123.

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By experimental methods, 26 specimens were designed to conduct elastic and elastic–plastic buckling tests on cylindrical shells containing cracks. This study discusses the influence of factors such as the length–diameter ratio, the diameter–thickness ratio, the crack length, the inclination of the crack, etc., on the buckling load. Additionally, finite element models were established to compare with experimental results. For the PMMA cylindrical shell, the results showed that as the length–diameter ratio of the cylindrical shell increased, the buckling load first decreased and then increased.

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13

POWELL, ERIC N. "SOLVING THE PUZZLE OF THE BIVALVE SHELL FRAGMENT: INFERRING THE ORIGINAL ABUNDANCE AND SIZE FREQUENCY FROM THE FRAGMENTED RECORD." PALAIOS 35, no. 10 (2020): 432–45. http://dx.doi.org/10.2110/palo.2020.035.

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ABSTRACT Much of the contribution of bivalves to paleoecology is based on the fraction preserved whole. The use of fragments has been limited by the inability to reconstruct the whole shell. For this study, shells of selected species were broken, metrics obtained for shell reconstruction, and a stepwise model developed and tested to evaluate the potential of reconstructing whole shells from fragments. The model is based on the facts that shell thickness is well correlated with shell length, width, and weight, that fragments can be assigned to shell areas, and that each shell area can be matche

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14

Li, Bing Ru, Xuan Yin Wang, Hui Liang Ge, and Yue Peng Jiang. "Study on Applicability of Sound Radiation Characteristics of Thin Finite Length Cylindrical Shells Using Wave Propagation Approach." Applied Mechanics and Materials 190-191 (July 2012): 1325–30. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.1325.

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Based on Donnell’s thin shell theory and basic equations, the wave propagation method is discussed here in detail, which is used to investigate the vibration and sound radiation characteristics of thin finite length circular cylindrical shells and ring stiffened shells under various boundary conditions. The effects of boundary conditions, mode truncation, shell’s length, thickness and rings on the acoustic radiation are explored. It is shown that the wave propagation method is more effective for the long cylindrical shell, and the mode truncation can satisfy the calculation accuracy. The concl

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15

DE FRANCESCO, CLAUDIO G., and GABRIELA S. HASSAN. "SALINITY-RELATED PRESERVATION OF MOLLUSKS IN SHALLOW LAKES: IMPLICATIONS FOR THE UNDERSTANDING OF THE LACUSTRINE PAMPEAN FOSSIL RECORD." PALAIOS 38, no. 3 (2023): 111–24. http://dx.doi.org/10.2110/palo.2021.048.

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ABSTRACT Premortem and postmortem processes significantly influence the formation of the molluscan fossil record in freshwater environments. Despite their importance for paleoenvironmental studies, they remain poorly understood. In Pampean shallow lakes, Holocene shell deposits of the euryhaline snail Heleobia parchappii show a relation with salinity, as preservation seems to be favored by brackish-saline water conditions. To explore if this pattern may respond to ecological (i.e., differential survival and reproduction) or taphonomic processes acting differently in freshwater and brackish-sal

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Mitchell, Jeremy S., Robert C. Bailey, and Richard W. Knapton. "Sources of bias in the use of shell fragments to estimate the size of zebra and quagga mussels (Dreissena polymorpha and Dreissena bugensis)." Canadian Journal of Zoology 77, no. 6 (1999): 910–16. http://dx.doi.org/10.1139/z99-042.

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Several researchers have examined size-selective predation on dreissenid mussels by first measuring septa from crushed mussel shells found in predators' gastrointestinal tracts and then using a regression of septum length on shell length to infer the size of consumed mussels. We examine three assumptions made when using this approach: (1) that the shell length : septum length relationship is site-independent within the study area, (2) where both zebra mussels (Dreissena polymorpha) and quagga mussels (Dreissena bugensis) are present, that the shell length : septum length relationship is the sa

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17

Beltman, W. M., E. N. Burcsu, J. E. Shepherd, and L. Zuhal. "The Structural Response of Cylindrical Shells to Internal Shock Loading." Journal of Pressure Vessel Technology 121, no. 3 (1999): 315–22. http://dx.doi.org/10.1115/1.2883709.

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The internal shock loading of cylindrical shells can be represented as a step load advancing at constant speed. Several analytical models are available to calculate the structural response of shells to this type of loading. These models show that the speed of the shock wave is an important parameter. In fact, for a linear model of a shell of infinite length, the amplitude of the radial deflection becomes unbounded when the speed of the shock wave is equal to a critical velocity. It is evident that simple (static) design formulas are no longer accurate in this case. The present paper deals with

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Kalesaran, Ockstan, Cyska Lumenta, and Winda Mingkid. "GROWTH PATTERNS OF THE PEARL OYSTER Pinctada margaritifera IN NORTH SULAWESI WATERS." Jurnal Perikanan Unram 11, no. 2 (2021): 243–50. http://dx.doi.org/10.29303/jp.v11i2.260.

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The pearl oyster Pinctada margaritifera (Linnaeus, 1758) or black lip pearl oyster is a marinebivalves with important economic value. This Indo-Pacific species is found in abundance in the waters of North Sulawesi, but cultivation activities have not been optimized. Growth information is important for aquaculture activities because it is a useful indicator to determine the health of pearl oysters and environmental suitability (Moussa, 2013). The purpose of this study was to determine the growth pattern of P. margaritifera pearl shells in the waters of North Sulawesi. Species P. margaritifera w

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Dhruvi, Patel, Patel Krupal, Patel Pooja, and Jigneshkumar Trivedi. "Shell utilization pattern by the hermit crab Diogenes custos (Fabricius, 1798) along Gulf of Kachchh, Gujarat, India." Journal of Biological Studies 3, no. 2 (2020): 79–95. http://dx.doi.org/10.62400/jbs.v3i2.5141.

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Present work aims to study the gastropod shell utilization pattern of hermit crab Diogenes custos in the intertidal zone of Gulf of Kachchh, Gujarat, India. Hermit crab specimens were collected randomly during the low tide timings using hand picking method in February 2019 and November 2019. Data on abundance of common gastropod species were also collected using a quadrate sampling method. Hermit crab wet weight (HW) and their shield length (SL) (represent the size of the hermit crabs) were measured. Gastropod shells were identified up to species level and different morphological characters su

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Saunders, W. Bruce, and Earl A. Shapiro. "Calculation and simulation of ammonoid hydrostatics." Paleobiology 12, no. 1 (1986): 64–79. http://dx.doi.org/10.1017/s0094837300002980.

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The buoyancy, stability, and orientation of a shelled cephalopod in water are the predictable products of shell geometry, body chamber length, and such physical parameters as shell, tissue, and water densities. Given such physical characteristics as shell geometry, shell, tissue, and water densities, and shell thickness, the hydrostatic characteristics of planispiral shelled cephalopods, including orientation, centers of mass and buoyancy, stability, and neutrally buoyant body chamber length, can be calculated and simulated using microcomputer-based techniques. Individual variables such as geo

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Chapaev, Takhir, and Nurilla Noraliev. "Determination of critical stresses during prestressing along the entire length of a circular-cylindrical shell." E3S Web of Conferences 262 (2021): 01030. http://dx.doi.org/10.1051/e3sconf/202126201030.

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In the Russian Federation, there is an urgent issue of grain storage and processing to be resolved through the reconstruction of old and construction of new storage facilities. Currently, the most common construction is represented by steel granaries, erected by rolling using prestressing in shells. The relevance of the problem of stability of the wall of a granary, taking into account the main factors, affecting the strength, requires further theoretical and experimental study. One of the most frequently used in solving stability problems is the energy criterion in the form of Ritz-Timoshenko

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Bustnes, Jan Ove. "Selection of blue mussels, Mytilus edulis, by common eiders, Somateria mollissima, by size in relation to shell content." Canadian Journal of Zoology 76, no. 9 (1998): 1787–90. http://dx.doi.org/10.1139/z98-111.

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The blue mussel, Mytilus edulis, is the most important food item for the common eider, Somateria mollissima, but the mussels eaten by eiders vary in length between both areas and seasons. The aim of this study was to experimentally test the hypothesis that common eiders try to minimize shell intake when selecting among mussels of different lengths. Two types of experiments were conducted using wild common eiders in captivity. Experiment 1 tested whether eiders could seek out the mussels with least relative shell content and highest flesh content from among mussels of an array of lengths. They

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Tärno, Ülo A. "Internal Forces and Cracks in Medium Length Shells." International Journal of Space Structures 4, no. 3 (1989): 129–33. http://dx.doi.org/10.1177/026635118900400302.

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The paper deals with the results of theoretical and experimental studies of cylindrical and quasicylindrical shells with various types of cracks and line hinges. For the analysis of inner forces of a quasicylindrical shell the modified method of approximation of shear flow has been used taking into account the direction change of the membrane longitudinal forces. The method tries to take into account, as much as possible, the peculiarities of reinforced concrete. The paper deals with the main types of cracks in quasicylindrical and cylindrical shells with various geometrical and loading condit

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Dzebisashvili, Georgii T., Andrei L. Smirnov, and Sergei B. Filippov. "Fundamental frequencies of long prismatic shells." Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy 11, no. 4 (2024): 772–81. https://doi.org/10.21638/spbu01.2024.412.

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The impact of the length of a shell on the fundamental frequencies of natural vibrations of a prismatic thin shell is studied in the paper. A thin cylindrical shell, the cross-section of which is a regular polygon, is analyzed. Provided that the perimeter of the cross-section is preserved, the influence of the length of the structure and the number of faces on the natural frequencies is examined. For limiting cases of the number of faces (shells with the square cross-section and circular cross-section), the results of numerical analysis in COMSOL and the analytical results are in close agreeme

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Hidayatullah, Martin Sulung, Tamrin Tamrin, Oktafri Oktafri, and Warji Warji. "Rancang Bangun dan Uji Kinerja Alat Pemisah Kernel Sawit dari Cangkangnya dengan Menggunakan Larutan Garam." Jurnal Agricultural Biosystem Engineering 2, no. 2 (2023): 281. http://dx.doi.org/10.23960/jabe.v2i2.7482.

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. Palm oil has an important role to play in improving the country's foreign exchange. The largest selling point in palm oil is palm kernel oil (PKO), this palm kernel oil processing process involves a mixture of kernels and shells that will later be separated. This research aims to design the build and produce a prototype kernel separator from its shell by using a saline solution to minimize excess costs and able to separate the kernel and shell >80%. Methods carried out in this study include designing, manufacturing and testing. After that, prototype kernel separator with palm shell using

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Thangarasu, Meganathan, and Jeevanadham Paul. "MORPHOMETRIC VARIATIONS ON APPLE SNAIL PILA GLOBOSA (SWAINSON, 1822) AT FORAGING SELECTED SITE OF ASIAN OPENBILL STORK ANASTOMUS OSCITANS IN SEMBANARKOIL REGION, NAGAPATTINAM DISTRICT, TAMILNADU, INDIA." International Journal of Scientific Research and Modern Education 2, no. 2 (2017): 86–94. https://doi.org/10.5281/zenodo.1117205.

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The present study was conducted on Morphometric variations of Apple Snail <em>Pila globosa</em> (Swainson, 1822) at foraging selected site of Asian Openbill Stork <em>Anastomus oscitans</em> in Sembanarkoil region, Nagapattinam District, Tamilnadu, India from October 2016 to September 2017. The shell length (3.56 ± 1.05 cm), shell width (2.90 ± 0.93 cm), Aperture length (2.59 ± 0.89 cm), Aperture width (1.39 ± 0.50 cm) and Shell thickness (1.33±0.66 mm) were observed. The total weight in wet condition and (33.14±11.86g) and total weight in dry conditio

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Akester, Robert J., and André L. Martel. "Shell shape, dysodont tooth morphology, and hinge-ligament thickness in the bay mussel Mytilus trossulus correlate with wave exposure." Canadian Journal of Zoology 78, no. 2 (2000): 240–53. http://dx.doi.org/10.1139/z99-215.

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We examined the shell morphology of the bay mussel Mytilus trossulus (Gould) at six locations with various levels of wave exposure in Barkley Sound on the west coast of Vancouver Island, British Columbia, Canada. Young adult M. trossulus (29-35 mm shell length) collected from wave-exposed sites displayed striking differences in shell morphology from M. trossulus from sheltered sites. Mytilus trossulus from wave-exposed habitats had a lower shell height / shell width ratio and a thicker shell; they also had higher, more robust dysodont teeth, as well as a thicker hinge ligament. Examination of

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Hu, H. T. "Influence of Shell Geometry on Buckling Optimization of Fiber-Composite Laminate Shells." Journal of Pressure Vessel Technology 113, no. 3 (1991): 465–70. http://dx.doi.org/10.1115/1.2928782.

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The buckling strength of fiber-composite laminate shells with given loading condition and material system is maximized with respect to fiber orientations by using a sequential linear programming method together with a simple move-limit strategy. Significant influence of shell thickness and shell length on the optimal fiber angles, the critical buckling loads and the critical buckling modes of fiber-composite laminate shells has been shown through this investigation.

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Nahar, DA, MR Islam, MS Islam, S. Jasmine, and MMR Mondol. "Growth pattern of freshwater bivalve mollusk Lamellidens marginalis (Lamarck, 1819) from the northwest Bangladesh." Journal of Bio-Science 27 (December 26, 2019): 121–32. http://dx.doi.org/10.3329/jbs.v27i0.44677.

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Growth, morphometry and length-weight relationships of the freshwater mussel Lamellidens marginalis (Lamarck, 1819) was studied during January 2014 and May 2015. Sampling was carried out monthly and a total of 560 specimens were collected from Rajshahi district, northwest of Bangladesh. The recorded length -breadth and length-width relationships were B = 0.179 + 0.475L and W = 0.196 + 0.3163L respectively. The length-total weight, length-wet tissue weight, length-dry tissue weight, length-shell weight, length-dry shell weight relationships were W = 0.1241L2.9066, W = 0.0524L2.7377, W =0.0116L2

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Hillis, Dylan, Kristina M. Barclay, Erin Foster, et al. "Estimating size-at-harvest from Indigenous archaeological clamshell assemblages in Coastal British Columbia." FACETS 9 (January 1, 2024): 1–15. http://dx.doi.org/10.1139/facets-2023-0128.

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Shellfish have supported Indigenous lifeways on the Pacific Coast of North America for millennia. Despite the ubiquity of clamshells in archaeological sites, shell size measurements are rarely reported due to a lack of applicable basis for generating size estimates from fragmentary remains. We present a linear regression-based method for determining shell length from hinge and umbo measurements of littleneck ( Leukoma staminea; n = 239), butter ( Saxidomus gigantea; n = 274), and horse ( Tresus nuttallii; n = 92) clams using both contemporary and archaeological shells collected from three regi

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Fuller, S. Cynthia, and Richard A. Lutz. "Shell morphology of larval and post-larval mytilids from the north-western Atlantic." Journal of the Marine Biological Association of the United Kingdom 69, no. 1 (1989): 181–218. http://dx.doi.org/10.1017/s0025315400049183.

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Comparison of early shell morphological features of six mytilids from the north-western Atlantic revealed differences useful for species identification and classification. Brachidontes exustus, lschadium recurvum, Geukensia demissa, Amygdalum papyrium, Mytilus edulis, and Modiolus modiolus larvae and post-larvae were cultured in the laboratory. Scanning electron micrographs of the shell and hinge during early ontogenetic stages showed that all species had a long provinculum with taxodont dentition. In addition, provinculum length and number of teeth increased during the larval period in the si

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32

Lu, Xiao Yang, Xiao Wei Zhao, Shi Ying Chen, Rong Li, and Qiao Sha Wang. "ANSYS Parametric Design of Double Layer Cylinder Reticulated Shell by the Upper and Lower Translation." Applied Mechanics and Materials 470 (December 2013): 489–92. http://dx.doi.org/10.4028/www.scientific.net/amm.470.489.

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The five double layer cylinder reticulated shells (single diagonal rod cylinder reticulated shell, Foeppl cylinder reticulated shell, double diagonal rod cylinder reticulated shell, lamella cylinder reticulated shell and three way grid of cylinder reticulated shell) are developed by adopting the upper and lower translation method. Five connection forms of web member (cross truss, positive four pyramidal, upend four pyramidal, evacuated positive four pyramidal, evacuated upend four pyramidal) and the methods of the node generation and element connection are established in the cylindrical coordi

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33

Ambarwati, Reni, and Ulfi Faizah. "Colour and Morphometric Variation of Donacid Bivalves from Nepa Beach, Madura Island, Indonesia." Biosaintifika: Journal of Biology & Biology Education 9, no. 3 (2017): 466. http://dx.doi.org/10.15294/biosaintifika.v9i3.11267.

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<p class="IsiAbstrakIndo"><span lang="EN-GB">Donacid bivalves vary in colour, pattern, and the shape of the shells. A population of donacid bivalves had been found in the northern shore of Madura Island, Indonesia. This study aimed to identify the donacids found in northern shore of Madura Island as well as to describe their variation on morphometric and morphological characters. Colour and pattern of 215 shells were observed and carefully photographed. Morphometric of the shells including the shell height, shell length, shell width, dorsal length, and umbo-margin length were measu

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34

Kohn, Alan J. "Slip-resistant silver-feet: shell form and mode of life in lower Pleistocene Argyropeza from Fiji." Journal of Paleontology 60, no. 5 (1986): 1066–74. http://dx.doi.org/10.1017/s0022336000022599.

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Asymmetric sculpture in the form of tubercles or ridges on the shells of large (mean shell length ~60 mm) turritelliform gastropods has previously been shown to enhance efficiency of the shell as a penetration anchor in burrowing through coarse sediment. The small (<8 mm) turritelliform shells of all species of Argyropeza (Family Cerithiidae) have both of these ratchetlike sculptural features. Four lines of evidence from Lower Pleistocene A. divina and A. schepmaniana from Fiji support the interpretation that they help resist back-slippage: cross-orientation, frictional asymmetry, allometri

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35

PRUSINA, I., M. PEHARDA, D. EZGETA-BALIC, S. PULJAS, B. GLAMUZINA, and S. GOLUBIC. "Life-history trait of the Mediterranean keystone species Patella rustica: growth and microbial bioerosion." Mediterranean Marine Science 16, no. 2 (2015): 393. http://dx.doi.org/10.12681/mms.1121.

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The age and shell growth patterns in populations of Patella rustica of the Adriatic Sea were determined by analyzing the inner growth lines visible in shell sections. Marginal increment analysis showed annual periodicity with annual growth line being deposited in May. The growth analysis of 120 individual shells showed that 90.8 % of collected individuals were less than 4 years of age and only two individuals (1.6 %) were older than 6 years. Population structure was described and the generalized von Bertalanffy growth parameters were calculated: asymptotic length (L∞) was 38.22 mm and the grow

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36

Liu, Ling, and Jianqiao Li. "Dynamic Deformation and Perforation of Ellipsoidal Thin Shell Impacted by Flat-Nose Projectile." Materials 15, no. 12 (2022): 4124. http://dx.doi.org/10.3390/ma15124124.

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Experimental and theoretical studies were carried out on the dynamic deformation and penetration response characteristics of metal ellipsoidal thin curved shells under impact loads. The deformation characteristics of the impacted ellipsoid shell was investigated via the use of a light gas gun to carry out impact loading experiments at different speeds. Ten cases of experiments were conducted with the impact velocities distributed between 25.69 m/s and 118.97 m/s. Stereo digital image correlation (3D-DIC) technology was applied to capture the dynamic deformation and penetration process of the i

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37

Hanna, M. S., and A. W. Beshara. "Orthotropic behaviour of shells and stability of uniaxially compressed cylinders." Aeronautical Journal 97, no. 963 (1993): 111–17. http://dx.doi.org/10.1017/s0001924000025197.

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AbstractShells, stability under various types of loadings and their combinations have not yet been completely investigated. This is due to incomplete knowledge of shell philosophy. The aim of this study is to provide a complete and integrated method for treating shell problems on a pure statical basis. This study introduces shell orthotropic behaviour, discusses hoop stress resultant actions, and applies the shell equilibrium equations to a uniaxially compressed cylindrical shell with finite length and fixed ends. Theoretical results are also compared with previously published experimental wor

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HERREID, CLYDE F., and ROBERT J. FULL. "Locomotion of Hermit Crabs (Coenobita Compressus) on Beach and Treadmill." Journal of Experimental Biology 120, no. 1 (1986): 283–96. http://dx.doi.org/10.1242/jeb.120.1.283.

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Coenobita compressus (H. Milne Edwards) walk forward on six legs using analternating tripod gait similar to that of insects. The first walking leg provides thedriving force for locomotion aided secondarily by the second walking leg, while thechelipeds act largely as supports. The left appendages are longer and heavier than theright, and they extend further laterally from the midline during their stride, thus compensating for the asymmetry of the crab which has a dextrally coiled shell and anabdomen displaced to the right. The abdomen is normally carried off the ground, but it is dragged when t

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39

Narita, Yoshihiro. "Accurate Results for Free Vibration of Doubly Curved Shallow Shells of Rectangular Planform (Part.2 Thickness effect)." EPI International Journal of Engineering 4, no. 2 (2021): 204–11. http://dx.doi.org/10.25042/10.25042/epi-ije.082021.13.

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This paper presents a follow-up study of a previous work that deals with the free vibration of moderately thin isotropic shallow shells under general edge conditions. The same semi-analytical method is used in this study for identical shape and degree of curvature in doubly curved geometry, and accurate natural frequencies are tabulated for a wide range of the shell edge conditions. Emphasis is made, however, to present the frequency parameters for the shallow shells with very thin thickness (representative length/shell thickness=100). In numerical experiments, convergence test is made against

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40

Guex, Jean. "A generalization of Cope’s rule." Bulletin de la Société Géologique de France 174, no. 5 (2003): 449–52. http://dx.doi.org/10.2113/174.5.449.

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Abstract For numerous shelly invertebrates, Cope’s rule is shown in this paper to merely describe the particular case where volume increase is strictly coupled with diameter or length. Allometries, which are frequently observed in the evolution of the shells’ geometry, mean that their size, volume and surface can vary independently. The consequences of this can be summarized as follows : 1) volume increase not coupled with an increase of diameter or length of the organisms generates increasing involution and/or lateral width in the shell of cephalopods, foraminifera and radiolarians ; 2) an in

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41

Li, H., and Z. B. Chen. "Torsional Sensors for Conical Shell in Torsional Vibrations." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 11 (2010): 2382–89. http://dx.doi.org/10.1243/09544062jmes1940.

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This paper presents shear piezoelectric sensors for conical shell sensing. The piezoelectric patch is polarized in the longitudinal direction of conical shell structure. The electrodes are fixed at the sides parallel to the directions of polarization. Sensors in this arrangement are only sensitive to the in-plane shear strains. Both sensing equations and modal signals are derived based on the thin-shell assumption and piezoelectric effect. Numerical results are presented for free torsional vibrations of frustum shell of revolution with clamped-free boundary, and the effects of sensor length on

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42

Simkin, L. M. "A method to determine patterns for changing parameters of the rope-net shell of midwater trawl along its length." Izvestiya TINRO 203, no. 1 (2023): 223–33. http://dx.doi.org/10.26428/1606-9919-2023-203-223-233.

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A technique for designing the rope-net shell of midwater trawl is described on example of the trawl Sirius Shelf project AS 11.012.000 designed by Aquaservice Ltd. Diagrams of the rope-net shell parameters distribution along trawl are used. The technique allows to analyze variations of these parameters for their optimization. A wide range of the trawl designing criteria can be taken into account using the diagram approach.

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43

Paulo Cabral, J. "Shape and growth in European Atlantic <i>Patella limpets</i> (Gastropoda, Mollusca). Ecological implications for survival." Web Ecology 7, no. 1 (2007): 11–21. http://dx.doi.org/10.5194/we-7-11-2007.

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Abstract. Specimens of Patella intermedia, Patella rustica, Patella ulyssiponensis, and Patella vulgata were analyzed for shell and radula characteristics. Shell growth in P. rustica and P. ulyssiponensis was basically isometric, indicating that shell shape was constant during growth. On the contrary, shell growth in P. intermedia and P. vulgata was positively allometric, indicating that as shells increased in size, the base became more circular and the cone more centred and relatively higher. Radula relative size increased in the order P. ulyssiponensis, P. vulgata, P. intermedia and P. rusti

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44

Herbert, Gregory S., Stephen P. Geiger, Stephen G. Hesterberg, et al. "Age and growth of one of the world’s largest carnivorous gastropods, the Florida Horse Conch, Triplofusus giganteus (Kiener, 1840), a target of unregulated, intense harvest." PLOS ONE 17, no. 4 (2022): e0265095. http://dx.doi.org/10.1371/journal.pone.0265095.

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The Florida Horse Conch, Triplofusus giganteus, one of the largest marine gastropods in the world, has been intensely exploited by shell collectors, curio dealers, and commercial harvest for over a century and is now in decline. Effective management of horse conch populations requires better data on commercial and recreational harvest intensities but also on the species’ intrinsic capacity to recover. Here, we use stable oxygen and carbon isotope sclerochronology to investigate the horse conch’s life history, including its maximum life span, growth rates, age at first spawning, and number of l

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45

Wei, Ranfeng, Guang Pan, Jun Jiang, and Kechun Shen. "Influence of ply angle and length on buckling behavior of composite shells under hydrostatic pressure." Journal of Reinforced Plastics and Composites 38, no. 10 (2019): 478–91. http://dx.doi.org/10.1177/0731684419828183.

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This paper is devoted to the buckling problem of the composite cylindrical shell subjected to hydrostatic pressure. Both analytical and numerical methods are applied to investigate the buckling behavior. Based on the study of analytical formulas, it is found that the composite cylindrical shells with the same length-to-diameter ratio, diameter-to-thickness ratio, and type of layup have the same buckling pressure. Thus, a scale model experiment method is then proposed, which uses the scale model to replace the full-scale model in pressure test experiment to reduce the manufacturing cost of the

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46

Glassow, Michael, Elizabeth A. Sutton, Carola Flores Fernandez, and Heather B. Thakar. "Proxy Measurements of California Mussel Valve Length." Advances in Archaeological Practice 4, no. 1 (2016): 31–40. http://dx.doi.org/10.7183/2326-3768.4.1.31.

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AbstractArchaeologists studying shell assemblages from prehistoric sites along the Pacific coast of North America have been interested in the influences of collecting intensity and environmental variability on California mussel (Mytilus californianus) size. To determine the variation in mussel size within a shell assemblage, researchers have developed a variety of proxies of mussel valve length based on measurements of morphological features occurring at or near the valve’s umbo. We propose four additional measurements that can serve as proxies and evaluate their correlation with valve length

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47

Vasconcelos, Paulo, Carlos M. Barroso, and Miguel B. Gaspar. "Morphometric relationships and relative growth of Hexaplex trunculus and Bolinus brandaris (Gastropoda: Muricidae) from the Ria Formosa lagoon (southern Portugal)." Journal of the Marine Biological Association of the United Kingdom 96, no. 7 (2015): 1417–25. http://dx.doi.org/10.1017/s0025315415001472.

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The present study reports morphometric relationships and discusses the relative growth in the banded murex (Hexaplex trunculus) and the purple dye murex (Bolinus brandaris) from the Ria Formosa lagoon (southern Portugal). A total of 11 morphometric parameters (eight linear variables: shell length, shell width, total aperture length, aperture length, aperture width, spire length, spire width and siphonal canal length; three ponderal variables: total weight, soft parts weight and shell weight) were analysed in both species. The analyses comprised numerous individuals of both sexes and with broad

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48

Li, Zhi Min. "New Results of Buckling and Postbuckling Behaviors for Fiber-Reinforced Composite Shear Deformable Anisotropic Laminated Cylindrical Shell Subjected to Torsion." Applied Mechanics and Materials 117-119 (October 2011): 89–91. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.89.

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New results of buckling and postbuckling analysis are presented for a shear deformable anisotropic laminated cylindrical shell of finite length subjected to torsion. The governing equations are based on a higher order shear deformation shell theory with von Kármán-Donnell-type of kinematic nonlinearity and including the extension/twist, extension/flexural and flexural/twist couplings. The nonlinear prebuckling deformations and initial geometric imperfections of the shell are both taken into account. A singular perturbation technique is employed to determine the buckling loads and postbuckling

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Voropay, Alexey, Serhii Povaliaiev, and Andrey Sharapata. "Two inverse non-stationary problems of axially symmetric deformation of a finite-length elastic cylindrical shell." Automobile transport, no. 51 (December 29, 2022): 74–84. http://dx.doi.org/10.30977/at.2219-8342.2022.51.0.08.

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Among the many problems of the solid mechanics, there is a whole class of problems that are related to inverse problems. In turn, among the inverse problems, many problems are ill-posed. Obtaining an exact analytical solution of such problems is related to certain mathematical difficulties and requires using special methods. Goal. The goal of the study is to obtain analytical solutions for inverse problems of the identification of non-stationary load and the control of non-stationary vibrations of a cylindrical shell with asymmetric boundary conditions. Methodology. In this investigation, a re

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Pfister, Catherine A., Kaustuv Roy, J. Timothy Wootton, et al. "Historical baselines and the future of shell calcification for a foundation species in a changing ocean." Proceedings of the Royal Society B: Biological Sciences 283, no. 1832 (2016): 20160392. http://dx.doi.org/10.1098/rspb.2016.0392.

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Seawater pH and the availability of carbonate ions are decreasing due to anthropogenic carbon dioxide emissions, posing challenges for calcifying marine species. Marine mussels are of particular concern given their role as foundation species worldwide. Here, we document shell growth and calcification patterns in Mytilus californianus , the California mussel, over millennial and decadal scales. By comparing shell thickness across the largest modern shells, the largest mussels collected in the 1960s–1970s and shells from two Native American midden sites (∼1000–2420 years BP), we found that moder

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