Results 71 to 80 of about 13,652 (300)

The origin of planetary impactors in the inner solar system [PDF]

, 2005
New insights into the history of the inner solar system are derived from the impact cratering record of the Moon, Mars, Venus and Mercury, and from the size distributions of asteroid populations. Old craters from a unique period of heavy bombardment that
Ito, Takashi, Kring, David A., Malhotra, Renu, Strom, Robert G., Yoshida, Fumi   +4 more
core   +3 more sources

Deep learning cone‐beam computed tomography image segmentation for the 3D visualization of mandibular infraosseous periodontal defects

Journal of Periodontology, EarlyView.
Abstract Background The accurate assessment of infraosseous periodontal defects is crucial for effective diagnosis and treatment planning. Cone‐beam computed tomography (CBCT) enables detailed imaging of these defects; however, to leverage their full potential, CBCT images must be reconstructed in 3 dimensions (3D).
Daniel Palkovics, Balint Molnar, Csaba Pinter, David García‐Mato, Andres Diaz‐Pinto, Attila Tanacs, Andrea Dobos, Peter Windisch, Christoph A. Ramseier   +8 more
wiley   +1 more source

Are the detection and dimensions of peri‐implant buccal bone defects influenced by different implant materials and their location? An experimental cone‐beam computed tomography study

Journal of Periodontology, EarlyView.
Abstract Background The aim of this study is to evaluate the impact of different implant materials and arrangements within the field of view (FOV) and exomass on the diagnostic accuracy and image quality of cone‐beam computed tomography (CBCT) for the detection of peri‐implant buccal bone defects of various sizes. Methods A total of 120 CBCT scans with
Yulan Wang, Matheus L. Oliveira, Dorothea Dagassan‐Berndt, Michelle Simonek, Sebastian Kühl, Michael M. Bornstein   +5 more
wiley   +1 more source

Atmospheric effects on oblique impacts [PDF]

Laboratory experiments and theoretical calculations often use vertical impact angles (90 deg) in order to avoid the complicating effect of asymmetry.
Schultz, P. H.
core   +1 more source

Reconstructing the Holocene explosive eruptive history of the Erciyes volcano (Turkey) using proximal and distal tephra records

Journal of Quaternary Science, EarlyView.
ABSTRACT Mount Erciyes, the largest active volcano of Central Anatolia (Turkey), erupted explosively during the Holocene, producing the Karagüllü, Perikartin and Dikkartin tuff rings. Even though major cities like Kayseri and its ~1 million residents sit directly on these pyroclastic deposits, the timing and magnitude of the explosive eruptions have ...
Ivan Sunyé‐Puchol, Rengin Özsoy‐Ünal, Xavier Bolós, Victoria C. Smith, Efe Akkas, Lorenzo Tavazzani, Jan Aymerich, Manuela Nazzari, Pierre Lacan, Victoria Cullen, Olivier Bachmann, Piergiorgio Scarlato, Silvio Mollo   +12 more
wiley   +1 more source

Experimental evidence for non-proportional growth of large craters [PDF]

Evidence from laboratory impact experiments is indicating that increasing crater aspect ratios (diameter:depth) can result from increasing both velocity and projectile size without invoking unusual impactor conditions.
Gault, Donald E., Schultz, Peter H.
core   +1 more source

Cratering Experiments on the Self Armoring of Coarse-Grained Granular Targets

, 2012
Recently published crater statistics on the small asteroids 25143 Itokawa and 433 Eros show a significant depletion of craters below approx. 100 m in diameter.
A.M. Nakamura, Bottke, C. Güttler, Chapman, Chapman, Crater Analysis Techniques Working Group, Dayre, Dohi, Durda, Fujiwara, Fujiwara, Gault, Gladman, Hartmann, Hirata, Holsapple, Housen, Johnson, Lee, Lee, Melosh, Michel, N. Hirata, Nakamura, Okamoto, O’Brien, Richardson, Saito, Schmidt, Thomas, Thomas, Veverka, Yamamoto, Yamamoto, Yomogida   +34 more
core   +1 more source

Reidite Formation From Zircon Subjected to 20, 40, and 60 GPa Shock Experiments

Journal of Raman Spectroscopy, EarlyView.
Structure disordering as a result of shock pressure: In zircon shocked from 20 to 60 GPa, the shock‐induced structural disorder increases with increasing shock pressure (gray area). Shock disorder of zircon is an integral part of its transformation to reidite: Reidite occurs after amorphous material.
Dmitry A. Zamyatin, Elizaveta Kovaleva
wiley   +1 more source

Impact cratering calculations [PDF]

In the course of carrying out finite difference calculations, it was discovered that for large craters, a previously unrecognized type of crater (diameter) growth occurred which was called lip wave propagation.
Ahrens, Thomas J., Okeefe, J. D., Smither, C., Takata, T.   +3 more
core   +1 more source

Boulders on asteroid Toutatis as observed by Chang'e-2

, 2015
Boulders are ubiquitously found on the surfaces of small rocky bodies in the inner solar system and their spatial and size distributions give insight into the geological evolution and collisional history of the parent bodies. Using images acquired by the
Huang, Jiangchuan, Ip, Wing-Huen, Ji, Jianghui, Jiang, Yun, Li, Yuan, Marchi, Simone   +5 more
core   +1 more source