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75 results for “Projectile”
Data for a publication "Impact disruption of Bjurböle porous chondritic projectile"
<p>This archive contains raw and processed research data and photographic documentation for a publication "<em><strong>Impact disruption of Bjurböle porous chondritic projectile</strong></em>" by Kohout et al. The sample identifiers are consistent with the one used in the publication.</p> <p>Content:</p> <ol> <li><strong>Bjurböle photos.zip</strong>, <strong>Bjurböle photos II.zip</strong>, and <strong>Bjurböle photos III.zip</strong> - Photographs of studied Bjurböle meteorites from Finnish Museum of Natural History as well as from worldwide collections. Unless specified otherwise in the photographs (worldwide collections) the photo credits are Tomas Kohout, Assi-Johanna Soini, Arto Luttinen, University of Helsinki.</li> <li><strong>Meteoriteidentifier.ply</strong> - 3D shape reconstructions of studied Bjurböle and Chelyabinsk meteorites. By default a 3D mesh reconstruction with relaxed fitting was applied to partial aligned laser scans. In certain cases where multiple reconstruction techniques were applied (e.g. volume merge) this is indicated in file name.</li> <li><strong>All tables.xlsx</strong> - Spreadsheet file containing the tables presented in the publication</li> </ol>
Elastic pinch biomechanisms can yield consistent launch speeds regardless of projectile mass
<p><span></span></p> <p><span>Energetic trade-offs are particularly pertinent to bio-ballistic systems which impart energy to projectiles exclusively during launch. We investigated such tradeoffs in the spring-propelled seeds of <em>Loropetalum chinense, Hamamelis virginiana, </em>and<em> Fortunearia sinensis</em>. Using similar seed-shooting mechanisms, fruits of these confamilial plants (Hamamelidaceae) span an order of magnitude in spring and seed mass. We expected that as seed mass increased, ejection speed would decrease. Instead, ejection speed remained relatively constant. We tested if fruits shoot larger seeds by storing more elastic potential energy (PE). Spring mass and PE increased as seed mass increased (in order of increasing seed mass: <em>L. chinense, H. virginiana, F. sinensis</em>). As seed mass to spring mass ratio increased (ratios: <em>H. virginiana</em> = 0.503, <em>F. sinensis</em> = 0.653, <em>L. chinense</em> = 0.842), mass-specific PE storage increased. Conversion efficiency of PE to seed kinetic energy (KE) decreased with increasing fruit mass. Therefore, similar ejection speeds across scales occurred because (1) larger fruits stored more PE and (2) smaller fruits had higher mass-specific PE storage and improved PE to KE conversion. By examining integrated spring and projectile mechanics in our focal species, we revealed diverse, energetic scaling strategies relevant to spring-propelled systems navigating energetic trade-offs. </span></p>
A proposed equation for calculating the total horizontal distance in projectiles of varying launch and landing levels
<p><strong>Abstract</strong></p> <p>The projectile draws a path for the flight of the tool, a horizontal distance can be calculated according to the general law, but only if the two points of the launch and fall of the tool are equal, otherwise we need an equation to be added to the general law to calculate the real distance that was generated due to the difference between the launch and fall points. There are several equations to calculate this, but they are complex and can be simplified, the proposed equation was tested on large samples for three different throwing events from the track and field games, (javelin, shotput, disc). The proposed equation was based on the basics of mathematics and geometry. The equation was tested in terms of the advantage of deleting the height different, if the height is zero, the proposed equation is suitable even for projectiles with equal levels, and the credibility of the proposed equation with the previous equation was tested statistically, and there were no differences between the two equations (p>0.05). and due to the relative ease of access of the proposed equation to very similar results, researcher suggests applying the proposed equation.</p>
Elastic pinch biomechanisms can yield consistent launch speeds regardless of projectile mass
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Agatized Coral Projectile Point
This point was part of a donated collection to the Museum of Seminole County History in Sanford, FL. The point is an archaic stemmed point, potentially a Levy point. Note the inclusions and evidence of fossil shells, the tool is made from agatized coral commonly used in Florida stone tool manufacture. Model by Emma Dietrich Source: Objaverse 1.0 / Sketchfab
Projectile point (6441)
Fluted lanceolate projectile point. White chert? Tang broken and reglued with unidentified adhesive. Percussion and pressure flaking as well as some evidence of heat treating and basal and point grinding. Source: Objaverse 1.0 / Sketchfab
Bone with Embedded Stone Projectile Point
This large (and currently unidentified) bone fragment features an embedded stone projectile point. It was excavated from the Shell Island site in Orange County, Florida. It is permanently curated at the Rollins College Archaeology Lab and is currently on display at the Orange County Regional History Center. Model by Ellie Minette. Source: Objaverse 1.0 / Sketchfab
Kirk Serrated Projectile Point (2101a404-2)
**Kirk Serrated spear point** Location: Hardaway site (31St4), Stanly County, North Carolina. Period: Early Archaic (7000-6000 BC). Material: metavolcanic rock. Dimensions: length, 62.6 mm; width, 30.1 mm; thickness, 8.7 mm. Notes: Catalog no. 2101a404 (specimen 2), North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
Tests showing the projectile flight trajectory of 5, 7 and 8mm diameter steel spheres attached to either a detonator or a rear detonated C4 spherical explosive charge.
<p>These videos are the results of an experimental campaign carried out in the department of Propellant, Explosives and Blast Engineering of the Royal Military Academy in Brussels to study the flight trajectory of a projectile (steel sphere (5 or 7 or 8mm diameter)) attached to either a detonator or a rear detonated C4 spherical explosive charge. The projectile is accelerated by the blast wave generated by the explosive. The projectile initial trajectory is hidden by the flash of the detonation. After its passage through the opaque gas cloud, the first appearance of the projectile is captured and an almost straight trajectory can be tracked until the end of the field of view of the high speed camera. The test campaign reveals the capability of the projectiles to maintain an oriented path until impact on a target placed at 910mm stand of distance from the center of the explosion. </p>
Jasper Projectile Point
Striking, Marksville-period projectile point. Probably jasper, Kent type? Found in Tensas Parish, Louisiana, 2021 From the collection of Brad Black PP_01 Source: Objaverse 1.0 / Sketchfab
Supplementary information to "Rainbow in the dark. The identification of diagnostic projectile impact features on rock crystal"
<p>Images of the experimental projectiles (pre-hafting, hafted before and after shooting), Hirox (Low magnification) pictures of pre-hafting and post-shooting projectiles and selection of fractures smoked with magnesium.</p>
Folsom Projectile Point - Reworked
This Folsom projectile point, from Southeastern New Mexico, dates to approximately 9500 to 8000 BCE. The point was reworked into a knife which later broke. In other words, only the base is the only unmodified part of the Folsom point that remains. If you want to see the shape of the point better, click on Model Inspector (or press "i") and choose Matcap under Geometry. Source: Objaverse 1.0 / Sketchfab
Rocky Ridge - Projectile Point
A projectile point found at the Rocky Ridge site in far NE Utah. The point is 2.9 mm along it's maximum length. Source: Objaverse 1.0 / Sketchfab
Projectile Point. XPM-098. Sanak Island, Aaska
Bifacial Projectile Point. XPM-098. Sanak Island, Alaska. SR08-01-U2-L5. Dates 2800-2000 BCE XPM-098 is a multicomponent site on a low terrace along the Sapsuk River, Alaska Peninsula. One of the earliest sites in the region with evidence of salmonprocessing. It has remains similar to the Arctic Small Tool Tradition before 3000 BCE, and technologies clearly related to the Ocean Bay Tradition and Sanak Island between 2600 and 2000 BCE. There is also a small occupation about 200 BCE with similarities with the Adamagan Site. Original digitizing work done at the IVL at Id. St. Univ. Subsequent processing completed at Global Digital Heritage. These artifacts were scanned with either a Faro Edge Arm or a Minolta Vivid 9i. Processed in Geomagic or Polyworks. 4-8 photos were used for texture in Geomagic Wrap Maschner, H. et al. 2010. The Archaeology of the Sapsuk River, Alaska. An Occasional Papers Publication. Bureau of Indian Affairs, Alaska Region, Branch of Regional Archaeology, Anchorage. Source: Objaverse 1.0 / Sketchfab
Lithic projectile from Holešov H310_92
3D_id_HOL H310 276-92 68 Source: Objaverse 1.0 / Sketchfab
Potomac Projectile Point
An argillite Potomac projectile point recovered during the archaeological excavation of precontact period sites along Deep Run in Howard County, Maryland by Richard Stearns and the Natural History Society of Maryland in the 1930s and 1940s. Potomac projectile points are the smallest of the precontact period projectile points in Maryland and date to the Late Woodland period ranging from 1200 to 1700 AD. Courtesy of the Natural History Society of Maryland which has given permission for the model to be downloadable for non-commercial educational purposes. Source: Objaverse 1.0 / Sketchfab
Lamoka Projectile Point
A quartz Lamoka projectile point recovered during the 1943 archaeological excavation of precontact period sites along the Susquehanna River in Cecil County, Maryland. Lamoka projectile points dates to the Late Archaic period from 4500 and 3900 BP (3250-2400 BC). Courtesy of the Natural History Society of Maryland which has given permission for the model to be downloadable for non-commercial educational purposes. Source: Objaverse 1.0 / Sketchfab
Iron Projectile, S. Cucufate, Portugal
Iron projectile from roman villa of S. Cucufate, Alentejo, Portugal. High Roman Empire (1st century AD to 3rd century AD). Projectile tip with prismatic cone-shaped head, ending with sharp tip.. Although being part of military equipment, it was also used in civilian activities, such as hunting or equestrian sport. This specimen is close to the type of pilum catapultuarium, a throwing weapon used by Roman artillery, the arrowhead (pilum) being thrown by a catapult. Its total length is 7,4 cm. Currently it is exposed in the permanent exhibition of the museum of S. Cucufate (Vila de Frades, Vidigueira). Catalog No. CUC. 80 VIII 7 lado sul (1). Processed and modeled in Reality Capture from 489 photos. Project ID Ponteira De Pilum 3. PONTE, S. da, (1987): "Artefactos romanos e post-romanos de S. Cucufate", Conimbriga, XXVI, Coimbra. Source: Objaverse 1.0 / Sketchfab
XPF-058 Bifacial Projectile, Sanak Island, AK
Bifacial Projectile Fragment. Sanak Island, Alaska. XPF-058-116 XFP-058 small site on the west shore of Pauloff Harbor, Sanak Island, Alaska. It is a heavily disturbed shell midden with a few small house depressions. It dates approximately 200 BCE to 50 CE. These artifacts were scanned with either a Faro Edge Arm or a Minolta Vivid 9i. Processed in Geomagic or Polyworks. 4-8 photos were used for texture in Geomagic Wrap. The Sanak Island artifacts are presented as a result of the research conducted under grants NSF 0326584, NSF 0508101, NSF 1139266, NSF 1321411. H. Maschner, Principal Investigator. Original digitizing work done at the IVL at Id. St. Univ. Subsequent processing completed at Global Digital Heritage. Fieldwork and analysis done with the permission and collaboration of the Pauloff Harbor Tribe and the Sanak Corporation. Source: Objaverse 1.0 / Sketchfab
Dalton Projectile Point
Dalton Projectile Point (Catalog # 2004.48.192), a part of the Michigan State University Museum's Archaeology Teaching Collection. This tool, made out of chert, is associated with the Late Paleoindian and Early Archaic Periods of North America and is primarily found in the Midwest and Southeastern United States. These projectile points were used as spear or dart points, as well as multi-purpose cutting tools. Dimensions: approximately 5.8cm L x 2.7cm W x 0.6cm T, weight= 9.1g This 3D model was created by Jeff Painter using an Artec Space Spider and Artec Studio 14 Professional, in partnership with the MSU Digital Heritage Imaging and Innovation (DHI) Lab. Source: Objaverse 1.0 / Sketchfab
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