cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14268191.v1
title: Behavior of Auxetic Steel Wire RC Columns Exposed to Elevated Temperature

description: Abstract Twenty-four rectangular RC column specimens, constructed at 1/3 scale, were tested under axial loading to investigate the use of ASWM (one, two, three, four, and five layers) exposed to elevated temperatures. Six of the column specimens were subjected to laboratory temperature (control or un-damaged specimens) of 23oC. Eighteen of the column specimens were subjected to elevated temperatures (six columns at 250oC, six columns at 500oC, and six columns at 750oC) for 2 hr. The obtained results clearly showed that each axial load resistance, toughness, and stiffness were all negatively affected by escalated temperature degrees. Also, the confinement effectiveness in terms of the ultimate load was decreased with the increase in concrete compressive strength (un-damaged). The number of ASWM layers significantly influenced the ductility, energy absorption, and ultimate load improvement percentage. The number of the ASWM layers considerably enhanced the ductility up to a certain number of erected layers; however, adding more layers had no apparent effect.
DOI: 10.6084/m9.figshare.14268282
title: Estimation of structural stiffness with the use of Particle Swarm Optimization

description: Abstract The paper presents the theoretical background and four applications examples of the new method for the estimation of support stiffness coefficients of complex structures modelled discretely (e.g. with the use of the Finite Element Model (FEM) method based on the modified Particle Swarm Optimization (PSO) algorithm. In real-life cases, exact values of the supports’ stiffness coefficients may change for various reasons (e.g. order of fastening, state of the contact surfaces, environment changes, etc.). Because of the unknown coefficients, reliable simulations of fixed structure (i.e. mounted, assembled, not in a free-free state) are difficult to perform. The method serves as a tool to obtain good correlation between the FEM of a structure and the experimental data. Simple modal tests are required to estimate the first few modes of the fixed system. The FEM of the structure is considered in a free-free state and the support stiffness coefficients of the FEM are estimated by the proposed method. Further simulations with test-tuned and correlated complete FEM could be performed in time or frequency domain.
DOI: 10.6084/m9.figshare.14268282.v1
title: Estimation of structural stiffness with the use of Particle Swarm Optimization

description: Abstract The paper presents the theoretical background and four applications examples of the new method for the estimation of support stiffness coefficients of complex structures modelled discretely (e.g. with the use of the Finite Element Model (FEM) method based on the modified Particle Swarm Optimization (PSO) algorithm. In real-life cases, exact values of the supports’ stiffness coefficients may change for various reasons (e.g. order of fastening, state of the contact surfaces, environment changes, etc.). Because of the unknown coefficients, reliable simulations of fixed structure (i.e. mounted, assembled, not in a free-free state) are difficult to perform. The method serves as a tool to obtain good correlation between the FEM of a structure and the experimental data. Simple modal tests are required to estimate the first few modes of the fixed system. The FEM of the structure is considered in a free-free state and the support stiffness coefficients of the FEM are estimated by the proposed method. Further simulations with test-tuned and correlated complete FEM could be performed in time or frequency domain.
DOI: 10.6084/m9.figshare.14285047
title: On the oscillatory behaviours and rub-impact forces of a horizontally supported asymmetric rotor system under position-velocity feedback controller

description: Abstract This work is meant to investigate and control the nonlinear dynamical behaviours of a nonlinear asymmetric rotating shaft system. The studied system is modeled as a nonlinear dynamical system having both quadratic and cubic nonlinearities and excited at the primary resonance. A linear proportional-derivative controller is introduced to eliminate the nonlinear behaviours and to suppress the lateral vibrations of the rotating shaft. The influences of different control parameters on the oscillatory behaviours of the considered system are explored. The main obtained analytical results showed that the uncontrolled shaft may respond with forward and backward whirling motion. However, the proposed controller illustrated its feasibility in eliminating the nonlinear behaviours of the studied system and forcing it to behave like the linear systems. Moreover, the obtained results confirmed that the proportional control gain plays a dominant role in destabilizing the studied rotor system. Finally, the safe operation of the studied system with avoiding the rub-impact force occurrence is discussed.
DOI: 10.6084/m9.figshare.14285047.v1
title: On the oscillatory behaviours and rub-impact forces of a horizontally supported asymmetric rotor system under position-velocity feedback controller

description: Abstract This work is meant to investigate and control the nonlinear dynamical behaviours of a nonlinear asymmetric rotating shaft system. The studied system is modeled as a nonlinear dynamical system having both quadratic and cubic nonlinearities and excited at the primary resonance. A linear proportional-derivative controller is introduced to eliminate the nonlinear behaviours and to suppress the lateral vibrations of the rotating shaft. The influences of different control parameters on the oscillatory behaviours of the considered system are explored. The main obtained analytical results showed that the uncontrolled shaft may respond with forward and backward whirling motion. However, the proposed controller illustrated its feasibility in eliminating the nonlinear behaviours of the studied system and forcing it to behave like the linear systems. Moreover, the obtained results confirmed that the proportional control gain plays a dominant role in destabilizing the studied rotor system. Finally, the safe operation of the studied system with avoiding the rub-impact force occurrence is discussed.
DOI: 10.6084/m9.figshare.14325400.v1
title: Damage indices evaluation for one-dimensional guided wave-based structural health monitoring

description: Abstract Damage detection in structures and systems is essential for monitoring parameters that can affect their integrity. This paper evaluates the efficiency of four damage indices (DIs) commonly used with temporal wave signals. The root mean square deviation, mean absolute percentage deviation, covariance, and correlation coefficient deviation DIs are presented, and a normalization is then proposed. An Euler-Bernoulli beam is used as a guided wave modelled with the spectral element method and excited by a toneburst signal. It includes the theoretical background of the throw-off beam, undamaged and cracked beam spectral elements. The DIs for a single crack position and a map varying crack depth and positions are calculated with deterministic and random temporal signal responses derived from noise addition. Results showed that DIs could identify and quantify the damage conditioned to the pulse location point and the influence of noise in the estimation, which leads in an analysis comparable to practical applications.
DOI: 10.6084/m9.figshare.14325400
title: Damage indices evaluation for one-dimensional guided wave-based structural health monitoring

description: Abstract Damage detection in structures and systems is essential for monitoring parameters that can affect their integrity. This paper evaluates the efficiency of four damage indices (DIs) commonly used with temporal wave signals. The root mean square deviation, mean absolute percentage deviation, covariance, and correlation coefficient deviation DIs are presented, and a normalization is then proposed. An Euler-Bernoulli beam is used as a guided wave modelled with the spectral element method and excited by a toneburst signal. It includes the theoretical background of the throw-off beam, undamaged and cracked beam spectral elements. The DIs for a single crack position and a map varying crack depth and positions are calculated with deterministic and random temporal signal responses derived from noise addition. Results showed that DIs could identify and quantify the damage conditioned to the pulse location point and the influence of noise in the estimation, which leads in an analysis comparable to practical applications.
DOI: 10.6084/m9.figshare.14285060
title: Comparison of seismic performances of reinforced concrete frames strengthened by different techniques

description: Abstract The aim of this study is to compare the seismic performances of strengthening techniques applied to reinforced concrete (RC) non-ductile frames tested under the effects of seismic loads. In the experimental part of the study, one-third scale, one-bay, two-storey non-ductile hollow brick infilled RC frames were strengthened with five different techniques and tested under reversed cyclic lateral loads. One being reference, five of the frames were infilled with hollow bricks and plastered on both sides, one was strengthened with plain mortar, one was strengthened with steel fiber reinforced mortar, two were strengthened with precast RC plates. The last frame was strengthened with RC infill wall. Strengthening techniques increased strength and stiffnesses of the frames in the ranges from 57% to 189% and from 186% to 486% respectively. In the numerical analysis part, an existing RC non-ductile building located in Istanbul, strengthened with the techniques, were analyzed using a computer program. Numerical results were evaluated in terms of interstorey drift ratio together with the overall seismic performance of the building.
DOI: 10.6084/m9.figshare.14285060.v1
title: Comparison of seismic performances of reinforced concrete frames strengthened by different techniques

description: Abstract The aim of this study is to compare the seismic performances of strengthening techniques applied to reinforced concrete (RC) non-ductile frames tested under the effects of seismic loads. In the experimental part of the study, one-third scale, one-bay, two-storey non-ductile hollow brick infilled RC frames were strengthened with five different techniques and tested under reversed cyclic lateral loads. One being reference, five of the frames were infilled with hollow bricks and plastered on both sides, one was strengthened with plain mortar, one was strengthened with steel fiber reinforced mortar, two were strengthened with precast RC plates. The last frame was strengthened with RC infill wall. Strengthening techniques increased strength and stiffnesses of the frames in the ranges from 57% to 189% and from 186% to 486% respectively. In the numerical analysis part, an existing RC non-ductile building located in Istanbul, strengthened with the techniques, were analyzed using a computer program. Numerical results were evaluated in terms of interstorey drift ratio together with the overall seismic performance of the building.
DOI: 10.6084/m9.figshare.14325403
title: Mechanical Behaviour of Metallic Yielding Dampers with Different Aspect Ratios

description: Abstract Yielding shear plates have been widely used in metallic dampers as the primary source of energy dissipation. This study investigated the behavior of yielding shear plates with different aspect ratios when subjected to a gradually increasing lateral load. Five shear links with the thickness of 1mm and aspect ratios ranging from 1.0 to 1.5 were constructed and tested. The force-displacement relationships of the shear links were idealized and represented by bilinear curves. The obtained results indicated that the square shear links had a larger displacement ductility ratio, initial and effective stiffness when compared with rectangular shear links. It was also observed that the initial, effective, and post-yield stiffness of square shear links were increased as their size was increased. However, the displacement ductility ratio of shear links with square diaphragm was decreased as the size of the shear link was increased.
DOI: 10.6084/m9.figshare.14325403.v1
title: Mechanical Behaviour of Metallic Yielding Dampers with Different Aspect Ratios

description: Abstract Yielding shear plates have been widely used in metallic dampers as the primary source of energy dissipation. This study investigated the behavior of yielding shear plates with different aspect ratios when subjected to a gradually increasing lateral load. Five shear links with the thickness of 1mm and aspect ratios ranging from 1.0 to 1.5 were constructed and tested. The force-displacement relationships of the shear links were idealized and represented by bilinear curves. The obtained results indicated that the square shear links had a larger displacement ductility ratio, initial and effective stiffness when compared with rectangular shear links. It was also observed that the initial, effective, and post-yield stiffness of square shear links were increased as their size was increased. However, the displacement ductility ratio of shear links with square diaphragm was decreased as the size of the shear link was increased.
DOI: 10.25919/z70x-0f71
title: Parkes observations for project P1064 semester 2020APRS_07

description: The propagation of pulsar signal through the interstellar medium is affected by the fluctuations in the electron density in the line of sight from the pulsar to the observer. This is a frequency dependent phenomenon and will produce brightness variations (scintillation) and also broadening of the otherwise narrow pulse (scatter-broadening). The effect of these two are measurable at different frequencies due to their strong dependence on frequency, viz., broadening will be evident at lower radio frequencies and scintillation will be clearly resolved at higher frequencies. With this proposal, we aim to study the evolution of scatter-broadening and scintillation properties of 137 pulsars with the UWL receiver, and verify their relationship with each other. With this experiment, we aim at testing some of the fundamental theories of ionised interstellar medium. This large sample will also help in improving the understanding of the turbulence characteristics in the inner Galaxy. We request a total of 149 hours for this project.
DOI: 10.21227/rcfz-bp27
title: Granitic rock samples in the Peninsular Ranges Province and Transverse Ranges Province, Southern California

description: The datasets in the compressed file were used in the case study of the article entitled Automated Machine Learning Pipeline for Geochemical Analysis by Germán H. Alférez, et al. Our approach was evaluated with a compositional dataset from 6 fault-separated blocks in the Peninsular Ranges Province and Transverse Ranges Province. The Peninsular Ranges are a group of mountain ranges, stretching from Southern California to Southern Baja California, Mexico. North of the Peninsular Ranges Province is the east-west Transverse Ranges Province. Around this area, there are several faults that allow the subdivision of the provinces: San Andreas, San Jacinto, Elsinore, Pinto Mountain, and Banning. There are 6 structurally-bounded units or blocks bounded by these faults: San Gabriel, San Bernardino, and Little San Bernardino from Transverse Ranges; and San Jacinto, Perris, and Santa Ana from Peninsular Ranges. The data was collected and organized from the following reference:A. K. Baird and A. T. Miesch, “Batholithic rocks of southern california; a model for the petrochemical nature of their source materials,” Tech. Rep., 1984, report.
DOI: 10.5281/zenodo.4636119
title: Datasets, AU and pulse programs reported in "Frequency-Swept Ultra-Wideline Magic-Angle Spinning NMR Spectroscopy"

description: Experimental datasets, simulated spectra from Simpson, and AU/pulse programs (Topspin format) used in our work "Frequency-Swept Ultra-Wideline Magic-Angle Spinning NMR Spectroscopy" reporting the WCPMG-MAS NMR experiment.
DOI: 10.21227/czna-1s22
title: January 29 submission

description: ---
DOI: 10.6084/m9.figshare.14262365
title: Rapid deforestation of a coastal landscape driven by sea level rise and extreme events — validation points

description: These data accompany the 2021 manuscript published in Ecological Applications titled "Rapid deforestation of a coastal landscape driven by sea level rise and extreme events". In this manuscript, researchers used the Landsat Image record to classify coastal vegetation and is changes from 1985-2019 in the Alligator River National Wildlife Refuge in North Carolina.<br><br>These CSV files contain the coordinates and vegetation type of validation points for the classification. {1 = pine, 2 = deciduous, 3 = marsh, 4 = ghost forest, 5 = shrub, 6 = burn, 7 = dry pine}. Refer to the publication for a description of how the images were classified.
DOI: 10.6084/m9.figshare.14262365.v1
title: Rapid deforestation of a coastal landscape driven by sea level rise and extreme events — validation points

description: These data accompany the 2021 manuscript published in Ecological Applications titled "Rapid deforestation of a coastal landscape driven by sea level rise and extreme events". In this manuscript, researchers used the Landsat Image record to classify coastal vegetation and is changes from 1985-2019 in the Alligator River National Wildlife Refuge in North Carolina.<br><br>These CSV files contain the coordinates and vegetation type of validation points for the classification. {1 = pine, 2 = deciduous, 3 = marsh, 4 = ghost forest, 5 = shrub, 6 = burn, 7 = dry pine}. Refer to the publication for a description of how the images were classified.
DOI: 10.6084/m9.figshare.14249912
title: Rapid deforestation of a coastal landscape driven by sea level rise and extreme events — classified_maps (GeoTIFF)

description: These data accompany the 2021 manuscript published in Ecological Applications titled "Rapid deforestation of a coastal landscape driven by sea level rise and extreme events". In this manuscript, researchers used the Landsat Image record to classify coastal vegetation and is changes from 1985-2019 in the Alligator River National Wildlife Refuge in North Carolina. <br>This specific dataset is a GeoTIFF file depicting the classified maps of the study region from 1985-2019. The GeoTiff contains 23 bands, corresponding to the years of analysis and 10 bands corresponding to environmental characteristics including the predictor variables elevation, distance to coast, distance to channel. The pixel values of the raster correspond to vegetation classifications {1 = pine, 2 = deciduous, 3 = marsh, 4 = ghost forest, 5 = shrub, 6 = burn, 7 = dry pine}. Refer to the publication for a description of how the images were classified.
DOI: 10.6084/m9.figshare.14325406.v1
title: Trophic Groups Of Demersal Fish Of Santos Bay And Adjacent Continental Shelf, São Paulo State, Brazil: Temporal And Spatial Comparisons

description: The temporal and spatial variations of feeding habits and trophic groups of demersal fish species of Santos Bay and the adjacent continental shelf were investigated. The samples were taken in September 2005 and March 2006 by bottom otter trawling. The stomach content analysis of 2,328 specimens of 49 species showed most fish fed on a large range of food items but relied heavily on shrimp, crabs/swimming-crabs, amphipods, mysids, polychaetes, ophiuroids, squids, and teleosteans. The species were classified into ten trophic groups. Shrimp were an important food source in the Santos bay and inner shelf, while ophiuroids were important prey for predators of the middle shelf. Many species relied on crabs/swimming-crabs during the summer, especially on the middle shelf. The spatial and temporal variability in food resource utilization by fish were related to the pattern of distribution and abundance of their prey. The predation on shrimp and crabs/swimming-crabs seems to be related to the water mass dynamics of the region. Intraspecific comparisons demonstrated that most of the species display spatial and/or temporal variation in their diet. The demersal ichtyofauna can also be divided into the more general categories of piscivores, nektonic invertebrate feeders, benthic invertebrate feeders and planktonic invertebrate feeders.
DOI: 10.6084/m9.figshare.14325406
title: Trophic Groups Of Demersal Fish Of Santos Bay And Adjacent Continental Shelf, São Paulo State, Brazil: Temporal And Spatial Comparisons

description: The temporal and spatial variations of feeding habits and trophic groups of demersal fish species of Santos Bay and the adjacent continental shelf were investigated. The samples were taken in September 2005 and March 2006 by bottom otter trawling. The stomach content analysis of 2,328 specimens of 49 species showed most fish fed on a large range of food items but relied heavily on shrimp, crabs/swimming-crabs, amphipods, mysids, polychaetes, ophiuroids, squids, and teleosteans. The species were classified into ten trophic groups. Shrimp were an important food source in the Santos bay and inner shelf, while ophiuroids were important prey for predators of the middle shelf. Many species relied on crabs/swimming-crabs during the summer, especially on the middle shelf. The spatial and temporal variability in food resource utilization by fish were related to the pattern of distribution and abundance of their prey. The predation on shrimp and crabs/swimming-crabs seems to be related to the water mass dynamics of the region. Intraspecific comparisons demonstrated that most of the species display spatial and/or temporal variation in their diet. The demersal ichtyofauna can also be divided into the more general categories of piscivores, nektonic invertebrate feeders, benthic invertebrate feeders and planktonic invertebrate feeders.
DOI: 10.6084/m9.figshare.14325408
title: Bio-Optical Properties of the Inner Continental Shelf off Santos Estuarine System, Southeastern Brazil, and their Implications for Ocean Color Algorithm Performance

description: Optical characterizations of coastal water masses are important tools for a better understanding of physical and biochemical processes and aid the optimization of ocean color algorithms. In this study we present three optical classes of water observed during October/2005 and March/2006 on the inner continental shelf adjacent to Santos Bay (Brazil), based on remote sensing reflectance. ANOVA indicated a crescent estuarine influence in classes 1 to 3. Class 3 presented the highest chlorophyll-a and nutrient concentration and highest light absorption coefficients. Colored dissolved organic matter (CDOM) dominated the light absorption in all classes and was strongly correlated to salinity in October/2005 due to the influence of the La Plata plume. The results indicated that CDOM dynamics in the Santos inner shelf are very complex. The performance of global chlorophyll algorithms was significantly smaller for October/2005 than for March/2006. As inconsistent changes in light absorption spectra by phytoplankton were detected between samplings, the results show that future bio-optical algorithms for this region must be optimized preferentially considering CDOM optical parameters.