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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Vibration-Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (1217 pages)
    Edition: 1st ed.
    ISBN: 9783031157585
    Series Statement: Mechanisms and Machine Science Series ; v.125
    DDC: 530.124
    Language: English
    Note: Intro -- Preface -- Contents -- Keynote Lecture -- Vibration of Flexible Robots: A Theoretical Perspective -- 1 Introduction -- 2 Perpetual Vibration of Flexible Robots: Modeling Fundamentals -- 3 Run-time Vibration Under Inherent Flexibility -- 4 Source Term and Characteristics of Run-time Data on Vibration -- 5 Preludes to the Experimental Investigation of Vibration of Flexible Robots -- 6 Conclusions -- References -- ABM: Advanced Beam Models -- GBT-based Vibration Analysis of Cracked Steel-Concrete Composite Beams -- 1 Introduction -- 2 The Proposed Finite Element -- 3 Illustrative Example -- 4 Concluding Remarks -- References -- Projection Approach to Spectral Analysis of Thin Axially Symmetric Elastic Solids -- 1 Introduction -- 2 Natural Vibrations of an Elastic Rod -- 3 Numerical Analysis of Vibrations -- 4 Conclusions -- References -- AIM: Advances in Impact Mechanics and Computational Sciences -- Dynamic Response of a Reinforced Concrete Column Under Axial Shock Impact -- 1 Introduction -- 2 Models and Methods -- 2.1 Modeling the Object of Study, Loads and Actions -- 2.2 Analytical Solution of the Dynamic Buckling Problem -- 3 Results and Discussion -- 4 Conclusion -- References -- Energy Absorption Characteristics of Aluminium Alloy Tubes Subjected to Quasi-static Axial Load -- 1 Introduction -- 2 Materials and Methods -- 2.1 Geometry -- 2.2 Material Properties -- 2.3 Crashworthiness Performance Indicators -- 2.4 Finite Element Model -- 2.5 Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) -- 3 Results and Discussion -- 3.1 Validation of the Finite Element Model with Previous Work -- 3.2 Crashworthiness Performance of Circular Aluminium Alloy Tubes -- 3.3 Identifying the Suitable Aluminium Alloy to be Used for Crash-box -- 4 Conclusions -- References. , Estimation on Accuracy of Compressive and Tensile Damage Parameters of Concrete Damage Plasticity Model -- 1 Introduction -- 2 Stress-Strain Relationship Under Compression and Tension -- 3 Numerical Modelling and Experimental Setup -- 3.1 Experimental Setup -- 3.2 Constitutive Modelling -- 3.3 Numerical Modelling -- 4 Results and Discussions -- 4.1 Static Loading -- 4.2 Dynamic Loading -- 5 Conclusions -- References -- Influence of Constitutive Models on the Behaviour of Clay Brick Masonry Walls Against Multi Hit Impact Loading -- 1 Introduction -- 2 Experimental Investigation -- 3 Constitutive Behaviour and Numerical Modelling -- 3.1 Drucker Prager Constitutive Behaviour -- 3.2 Mohr Coulomb Constitutive Behaviour -- 3.3 Concrete Damage Plasticity Constitutive Behaviour -- 3.4 Brick Mortar Interface Constitutive Behaviour -- 4 Numerical Modelling and Mesh Convergence -- 5 Comparison of Experiment and FE Simulation Results -- 6 Conclusion -- References -- CEW: Computational Efficiency in Wave Propagation and Structural Dynamics Analyses -- Effect of Solid Dust Particles on the Propagation of Magnetogasdynamical Shock Waves in a Non-ideal Gas with Monochromatic Radiation -- 1 Introduction -- 2 Ruling Equations -- 3 Self-Similarity Transformations -- 4 Results and Discussion -- 4.1 Upshot of the Existence of the Magnetic Field: -- 4.2 Upshot of the Intensifying Non-idealness Parameter of the Gas ( b) -- 5 Conclusion -- References -- Seismic Vulnerability Assessment of Old Brick Masonry Buildings: A Case Study of Dhulikhel -- 1 Introduction -- 2 Traditional Buildings in Dhulikhel: General Features and Structural System -- 3 Case Study: Representative Building in Dhulikhel -- 4 Numerical Modelling -- 5 Analysis and Seismic Vulnerability Assessment -- 6 Results and Discussions -- 7 Conclusions -- References. , Test of an Idea for Improving the Efficiency of Nonlinear Time History Analyses When Implemented in Seismic Analysis According to NZS 1170.5:2004 -- 1 Introduction -- 2 Theory in Brief -- 3 Numerical Investigation -- 3.1 Preliminary Notes -- 3.2 The Example -- 4 Discussion -- 5 Conclusions -- References -- DBM: Dynamics of Bridge Structures - Mathematical Modelling and Monitoring -- Development of a Remote and Low-Cost Bridge Monitoring System -- 1 Introduction -- 2 Methodology -- 2.1 Object of Study -- 2.2 Finite Element Model -- 2.3 BIM Model -- 2.4 Proposed Monitoring System -- 3 Results and Discussion -- 4 Conclusion -- References -- Fractional Mass-Spring-Damper System Described by Conformable Fractional Differential Transform Method -- 1 Introduction -- 2 Problem Formulation for Mass-Spring Damper System -- 3 Results and Analysis -- 4 Conclusion -- References -- Pushover Analysis Accounting for Torsional Dynamic Amplifications for Pile-Supported Wharves -- 1 Introduction -- 2 Case Study -- 3 Materials and Methods -- 3.1 Materials -- 3.2 Methodology -- 4 Analyses and Results -- 5 Conclusions -- References -- Service Life Assessment of Steel Girder Bridge Under Actual Truck Traffic -- 1 Introduction -- 2 Bridge Deck and Girder Geometry -- 3 Fatigue Truck Model -- 4 Actual Truck Traffic Database -- 5 Finite Element Modelling -- 6 Model Validation -- 7 Evaluation of Bridge Service Life -- 8 Summary and Conclusions -- References -- DHM: Dynamics and Control in Human-Machine Interactive Systems -- A Two-Dimensional Model to Simulate the Effects of Ankle Joint Misalignments in Ankle-Foot Orthoses -- 1 Introduction -- 2 Methodology -- 2.1 Model Description -- 2.2 Mathematical Formulation -- 2.3 Ankle Joint Misalignment Cases -- 3 Results -- 4 Discussion -- 5 Conclusions -- References -- DIM: Direct and Inverse Methods for Wave Propagation Prediction. , Theorical Modelling of Longitudinal Wave Propagation Emitted by a Tunnel Boring Machine in a Finite Domain -- 1 Introduction -- 2 Tunnel Excavation in Lyon, France -- 2.1 Presentation of the Site -- 2.2 Instrumentation and Acquisition -- 3 Geometry of the Domain -- 4 Formulation of the Problem -- 4.1 Materials -- 4.2 Modelling the Dynamic Sollicitation -- 4.3 Boundary Conditions -- 4.4 Interfaces -- 4.5 Initial Conditions -- 4.6 Balance of the Problem -- 5 Conclusion -- References -- Ultrasonic Wave Propagation in Imperfect Concrete Structures: XFEM Simulation and Experiments -- 1 Introduction -- 2 Wave Propagation Using Dynamic XFEM Formulations -- 2.1 Constitutive Mechanical Equations -- 2.2 Enrichment Scheme -- 2.3 Mass Lumping Technique -- 2.4 Absorbed Boundary Conditions -- 3 Experiments -- 4 Results and Discussion -- 5 Conclusion -- References -- Vibration Analysis of Pressurized and Rotating Cylindrical Shells by Rayleigh-Ritz Method -- 1 Introduction -- 2 Strain and Kinetic Energy -- 3 Strain and Kinetic Energy Condensed to Shell Cross-Section -- 4 Stiffness and Mass Matrices -- 4.1 Stiffness Matrix -- 4.2 Geometric Stiffness Matrix -- 4.3 Mass Matrices -- 5 Matrix Equation of Motion -- 6 Boundary Conditions and Coordinate Functions -- 6.1 Free Cylindrical Shell -- 6.2 Clamped Cylindrical Shell -- 6.3 Simply-Supported Cylindrical Shell -- 7 Illustrative Numerical Examples -- 7.1 Free Cylindrical Shell -- 7.2 Clamped Cylindrical Shell -- 7.3 Simply-Supported Cylindrical Shell -- 8 Conclusion -- References -- DSP: Dynamic Stability, Deterministic, Chaotic and Random Post-critical States -- Analytical Solution of the Problem of Free Vibrations of a Plate Lying on a Variable Elastic Foundation -- 1 Introduction -- 2 Review of Research and Publications -- 3 Research Results -- 4 Conclusions -- References. , Dynamic Mixed Problem of Elasticity for a Rectangular Domain -- 1 Introduction -- 2 Statement of the Problem -- 3 Solving the Problem -- 4 Conclusions -- 5 Numerical Results -- References -- Free Flexural Axisymmetric Vibrations of Generalized Circular Sandwich Plate -- 1 Introduction -- 2 Analytical Model of the Circular Sandwich Plate -- 3 Analytical Solution of the Free Flexural Axisymmetric Vibration of the Plate -- 3.1 Circular Sandwich Plate with Simply Supported Edge -- 3.2 Circular Sandwich Plate with Clamped Edge -- 4 Conclusions -- References -- FVF: Forced Vibrations in Structures and Vibration Fatigue -- Estimation of Fatigue Crack Growth at Transverse Vibrations of a Steam Turbine Shaft -- 1 Introduction -- 2 Simulation of the Crack Growth Process -- 3 Effect of Operating Factors on Crack Growth -- 4 Conclusions -- References -- Forced Vibration of Bus Bodyworks and Estimates of Their Fatigue Damage -- 1 Introduction -- 2 Load Cases -- 3 Case Study -- 3.1 S-N Line -- 3.2 Stress Spectra -- 3.3 Fatigue Life Calculations -- 4 Conclusions -- References -- Integrated Force Shaping and Optimized Mechanical Design in Underactuated Linear Vibratory Feeders -- 1 Introduction -- 2 Theoretical Background -- 2.1 Model of the Underactuated Linear Vibratory Feeder -- 2.2 Underactuation Issues: The Subspace of the Allowable Motion -- 2.3 The Force Shaping Strategy -- 2.4 Selection of the Structural Modification Through Sensitivity Analysis -- 3 Application of the Integrated Method -- 3.1 Numerical Simulations -- 3.2 The MSC Adams Multibody Simulator: Analysis of the Parts Flow -- 4 Conclusions -- References -- Modal Properties and Modal-Coupling in the Wind Turbines Vibrational Characteristics*-6pt -- 1 Introduction -- 2 Spectral Element Method -- 2.1 Beam Spectral Element -- 2.2 Formulation of the Spectral Tower Model -- 3 Numerical Results. , 4 Final Remarks.
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  • 2
    Publication Date: 2024-03-15
    Description: A batch culture experiment was conducted to study the interactive effects of ocean acidification (OA) and solar ultraviolet radiation (UVR, 280–400 nm) on the harmful dinoflagellate Karenia mikimotoi. Cells were incubated in 7-days trials under four treatments. Physiological (growth, pigments, UVabc) and toxicity (hemolytic activity and its toxicity to zebrafish embryos) response variables were measured in four treatments, representing two factorial combinations of CO2 (400 and 1000 μatm) and solar irradiance (with or without UVR). Toxic species K. mikimotoi showed sustained growth in all treatments, and there was not statistically significant difference among four treatments. Cell pigment content decreased, but UVabc and hemolytic activity increased in all HC treatments and PAB conditions. The toxicity to zebrafish embryos of K. mikimotoi was not significantly different among four treatments. All HC and UVR conditions and the combinations of HC*UVR (HC-PAB) positively affected the UVabc, hemolytic activity in comparison to the LC*P (LC-P) treatment, and negatively affected the pigments. Ocean acidification (OA) was probably the main factor that affected the chlorophyll-a (Chl-a) and UVabc, but UVR was the main factor that affected the carotenoid (Caro) and hemolytic activity. There were no significant interactive effects of OA*UVR on growth, toxicity to zebrafish embryos. If these results are extrapolated to the natural environment, it can be hypothesized that this strain (DP-C32) of K. mikimotoi cells have the efficient mechanisms to endure the combination of ocean acidification and solar UVR. It is assumed that this toxic strain could form harmful bloom and enlarge the threatening to coastal communities, marine animals, even human health under future conditions.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carotenoids, standard deviation; Carotenoids per cell; Cell density; Cell density, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chromista; Day of experiment; Deformation rate; Deformation rate, standard deviation; Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Haemolytic activity; Haemolytic activity, standard deviation; Immunology/Self-protection; Karenia mikimotoi; Laboratory experiment; Laboratory strains; Light; Myzozoa; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Optical density; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phytoplankton; Ratio; Ratio, standard deviation; Registration number of species; Salinity; Single species; Solar radiation; Solar ultraviolet radiation; Species; Temperature, water; Temperature, water, standard deviation; Time in hours; Treatment; Type; Ultraviolet absorbing compounds; Ultraviolet absorbing compounds, standard deviation; Uniform resource locator/link to reference; Wavelength
    Type: Dataset
    Format: text/tab-separated-values, 68105 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Wang, Hong; Niu, Xiaoqin; Feng, Xinqian; Gonçalves, Rodrigo J; Guan, WanChun (2019): Effects of ocean acidification and phosphate limitation on physiology and toxicity of the dinoflagellate Karenia mikimotoi. Harmful Algae, 87, 101621, https://doi.org/10.1016/j.hal.2019.101621
    Publication Date: 2024-03-15
    Description: This work demonstrated a 10-day batch culture experiment to test the physiology and toxicity of harmful dinoflagellate Karenia mikimotoi in response to ocean acidification (OA) under two different phosphate concentrations. Cells were previously acclimated in OA (pH = 7.8 and CO2 = 1100 μatm) condition for about three months before testing the responses of K. mikimotoi cells to a two-factorial combinations experimentation. This work measured the variation in physiological parameters (growth, rETR) and toxicity (hemolytic activity and its toxicity to zebrafish embryos) in four treatments, representing two factorial combinations of CO2 (450 and 1100 μatm) and phosphate concentration (37.75 and 4.67 umol l−1). Results: OA stimulated the faster growth, and the highest rETRmax in high phosphate (HP) treatment, low phosphate (LP) and a combination of high CO2 and low phosphate (HC*LP) inhibited the growth and Ek in comparison to low CO2*high phosphate (LCHP) treatment. The embryotoxicity of K. mikimotoi cells enhanced in all high CO2 (HC) conditions irrespective of phosphate concentration, but the EC50 of hemolytic activity increased in all high CO2 (HC) and low phosphate (LP) treatments in comparison of LCHP. Ocean acidification (high CO2 and lower pH) was probably the main factor that affected the rETRmax, hemolytic activity and embryotoxicity, but low phosphate was the main factor that affected the growth, α, and Ek. There were significant interactive effects of OA and low phosphate (LP) on growth, rETRmax, and hemolytic activity, but there were no significant effects on α, Ek, and embryotoxicity. If these results are extrapolated to the aquatic environment, it can be hypothesized that the K. mikimotoi cells were impacted significantly by future changing ocean (e.g., ocean acidification and nutrient stoichiometry).
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Cell density; Cell density, standard deviation; Chromista; Deformation rate; Deformation rate, standard deviation; Electron transport rate, relative; Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Haemolytic activity; Haemolytic activity, standard deviation; Identification; Immunology/Self-protection; Irradiance; Karenia mikimotoi; Laboratory experiment; Macro-nutrients; Myzozoa; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phytoplankton; Primary production/Photosynthesis; Registration number of species; Salinity; Single species; Species; Temperature, water; Time in hours; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 8248 data points
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  • 4
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 111 (2014): 11,738-11,743, doi:10.1073/pnas.1405260111.
    Description: Interactions between planktonic organisms, such as detection of prey, predators, and mates, are often mediated by fluid signals. Consequently, many plankton predators perceive their prey from the fluid disturbances that it generates when it feeds and swims. Zooplankton should therefore seek to minimize the fluid disturbance that they produce. By means of particle image velocimetry, we describe the fluid disturbances produced by feeding and swimming in zooplankton with diverse propulsion mechanisms, and ranging from 10-µm flagellates to 〉 mm-sized copepods. We show that zooplankton, in which feeding and swimming are separate processes, produce flow disturbances during swimming with a much faster spatial attenuation (velocity u varies with distance r as u ∝ r-3 to r-4), than that produced by zooplankton for which feeding and propulsion are the same process (u ∝ r-1 to r-2). As a result, the spatial extension of the fluid disturbance produced by swimmers is an order of magnitude smaller than that produced by feeders at similar Reynolds numbers. The ‘quiet’ propulsion of swimmers is achieved either through swimming erratically by short-lasting power-strokes, generating viscous vortex rings, or by ‘breast stroke swimming’. Both produce rapidly attenuating flows. The more ‘noisy’ swimming of those that are constrained by a need to simultaneously feed is due to constantly beating flagella or appendages that are positioned either anteriorly or posteriorly on the (cell) body. These patterns transcend differences in size and taxonomy and have thus evolved multiple times, suggesting a strong selective pressure to minimize predation risk.
    Description: The Centre for Ocean Life is a VKR Center of Excellence funded by the Villum Foundation. The work was further supported by a grant from the Danish Council for Independent Research, Natural Sciences to TK, RJG was supported by CONICET and FONCyT (PICT 2438). HJ was supported by NSF grant OCE-1129496.
    Keywords: Predation risk ; Biological fluid dynamics ; Optimization
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
    Format: video/mp4
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  • 5
    Publication Date: 2020-11-13
    Description: Biofilm-like properties can form on sea surfaces, but an understanding of the underlying processes leading to the development of these biofilms is not available. We used approaches to study the development of biofilm-like properties at the sea surface, i.e. the number, abundance and diversity of bacterial communities and phytoplankton, the accumulation of gel-like particles and dissolved tracers. During the expedition POS537 we used newly developed and free drifting mesocosms and performed incubation experiments. With these approaches we aim to investigate the role of light and UV radiation as well as the microbes themselves, which lead to the formation of biofilms. With unique microbial interactions and photochemical reactions, sea surface biofilms could be biochemical reactors with significant implications for ocean and climate research, e.g. with respect to the marine carbon cycle, diversity of organisms and oceanatmosphere interactions.
    Type: Report , NonPeerReviewed
    Format: text
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  • 6
    Publication Date: 2024-02-07
    Description: Marine mammals and the ecological functions they provide to coastal and pelagic ecosystems are increasingly threatened by the intensification of anthropogenic impacts. The Uruguayan coastline throughout the 20th century, like other coastal environments worldwide, has been the sink of a variety of trace metals derived from the rapid urbanization and industrialization of related land areas. This coastline is inhabited by two species of pinnipeds trophically and spatially segregated. Otaria byronia feeds in coastal environments while Arctocephalus australis preysmainly offshore. The present study aimed to analyze historic changes in concentrations of trace elements in teeth of both species from 1941 to the present day. We analyzed the dentin of 94 canine teeth using stable isotope analysis (delta C-13) and ICP-MS to determine their feeding areas and the concentration of 10 trace elements (Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) respectively. The concentration of Cr was significantly higher during '70-'80s, in both species coinciding with tannery industry development. Both species of pinnipeds have been differentially exposed to trace elements depending on their feeding area. A pelagic diet, possibly based on squid, increased the concentration of Cd in A. australis, while O. byronia has been more exposed to anthropogenic Pb and Cu associated to a costal and more benthic diet. Our results highlight dentin as a reliable matrix for historic studies on the exposure to trace elements. In light of our results, the O. byronia's declining population could be the result of the synergistic effects of trace elements together with other ecological pressures faced in their environment.
    Type: Article , PeerReviewed
    Format: text
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  • 7
    Publication Date: 2016-12-22
    Description: The purpose of this study was to determine the stocks of available P and S, total N, and oxidizable C at depth in an Oxisol cultivated with Eucalyptus in Brazil following different timber harvest intensities and fertilizer application over 12 years. The harvest regimes considered were (i) conventional stem-only harvest (all forest residues were maintained on the soil); (ii) whole-tree harvest (only litter was maintained on the soil—all slash, stemwood, and bark were removed); and (iii) whole-tree harvest + litter layer removal. The site was planted in 2004 considering three timber harvest intensities, some with and some without N and P fertilization. In 2012 the experiment was reinstalled, and all the treatments were reapplied in the each plot. From 2004 to 2016, nutrient accumulation and soil N, P, and S stocks were assessed in the 0–20 cm layer. Also in 2016, soil N, P, S, and oxidizable C stocks were measured to 2 m depth. For each treatment, the net balance of N, P, and S were calculated from soil stocks and harvest outputs during two forest rotations. A reduction in all nutrient stocks was observed in the 0–20 cm layer for all treatments. For N, this reduction was 20% smaller in the stem-only harvest treatment and 40% higher when no N fertilizer was applied, when compared to other treatments. Stem-only harvest treatment was observed to reduce the loss of N, P, and S due to harvest by 300, 30, and 25 kg·ha−1, respectively, when compared to the whole-tree harvest + litter layer removal treatment.
    Electronic ISSN: 1999-4907
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by MDPI Publishing
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