Results 71 to 80 of about 17,557 (292)

The International Association of Geodesy: from an ideal sphere to an irregular body subjected to global change [PDF]

History of Geo- and Space Sciences, 2019
The history of geodesy can be traced back to Thales of Miletus (∼600 BC), who developed the concept of geometry, i.e. the measurement of the Earth. Eratosthenes (276–195 BC) recognized the Earth as a sphere and determined its radius. In the
H. Drewes, J. Ádám
doaj   +1 more source

Empirical Earth Rotation Model: a Consistent Way to Evaluate Earth Orientation Parameters [PDF]

, 2009
To be published in the Proceedings of the Geodetic Reference Frame symposium held in Muenchen in October 2006.
openaire   +2 more sources

Optimization of the Production of Rubber Compounds Using Mathematical Models

Advanced Engineering Materials, EarlyView.
Rubber compounds were mixed in a batch internal mixer, and symbolic regression was used to derive mathematical models linking recipe and process parameters to ram path, torque, and mixing quality (incorporation, dispersion, distribution). Subsequent optimization with evolutionary algorithms identified operating conditions that reduce specific energy ...
Anke Bardehle, Andreas Limper, Ulrich Giese, Carlos Lucke, Mario Beiner, Christoph Gögelein, Lisa Leuchtenberger‐Engel, Christian Hopmann   +7 more
wiley   +1 more source

Determination of Venus’s Rotation State Using Radio-tracking Data from the Venus Express Spacecraft

The Planetary Science Journal
Despite its similarities to Earth, our understanding of Venus remains limited, particularly regarding its long retrograde rotation period. This has been measured using both Earth-based and in-orbit methods.
Maëva Lévesque, Pascal Rosenblatt, Jean-Charles Marty, Caroline Dumoulin   +3 more
doaj   +1 more source

Displacement Response Characteristics and Instability Risk Assessment of Excavation Face in Deep-Buried Shield Tunnel

Buildings
To prevent the occurrence of excavation face instability incidents during shield tunneling, this study takes the Bailuyuan tunnel of the ‘Hanjiang-to-Weihe River Water Diversion Project’ as the engineering background. A three-dimensional discrete element
Chenyang Zhu, Xin Huang, Chong Xu, Guangyi Yan, Jiaqi Guo, Qi Liang   +5 more
doaj   +1 more source

Workflow for Design of Experiments‐Based Modeling of Species Transport and Growth Kinetics in GaN Hydride Vapor Phase Epitaxy

Advanced Engineering Materials, EarlyView.
A novel workflow for investigating hydride vapor phase epitaxy for GaN bulk crystal growth is proposed. It combines Design of experiments (DoE) with physical simulations of mass transport and crystal growth kinetics, serving as an intermediate step between DoE and experiments.
J. Tomkovič, G. Lukin, H. Torkashvand, A. Kerschbaum, M. Müller, S. Besendörfer, J. Heitmann, J. Friedrich   +7 more
wiley   +1 more source

Calculation of normal mode spectra in laterally heterogeneous earth models using an iterative direct solution method,

Normal mode observations play an important role in studying broad-scale lateral variations in the Earth. Such studies require the calculation of accurate synthetic spectra in realistic earth models, and this remains a computationally challenging problem.
Deuss, Arwen, Woodhouse, John H, Al‐Attar, David   +2 more
core   +1 more source

Estimation of High-Frequency Earth Rotation Parameters from the Analysis of IVS-CONT14 Campaignand Comparison with IERS2010 Model [PDF]

, 2017
Bu çalışmada, Uluslararası Çok Uzun Baz İnterferometrisi (VLBI) Jeodezi ve Astrometri Servisi (IVS) tarafından 6-21 Mayıs 2014 tarihleri arasında 6 kıtadaki 17 VLBI istasyonunun katılımıyla gerçekleştirilen 15 günlük sürekli VLBI oturumlarından (IVS ...
Mehmet Fikret Öcal, Kamil Teke, Öcal, Mehmet Fikret, Teke, Kamil   +3 more
core   +1 more source

Direct Metal Deposition of Graphene–Ti28Nb35.4Zr Matrix Composites With Enhanced Mechanical, Corrosion, and Biocompatibility Properties for Bone Implants

Advanced Engineering Materials, EarlyView.
Graphene nanoplatelet (0.1 wt.%) reinforcement significantly enhances the performance of β Ti‐28Nb‐35.4Zr alloy. Grain refinement, reduced water contact angle, and improved surface characteristics promote osteoblast adhesion and complete surface coverage after 7 days.
Khurram Munir, Jixing Lin, Yuncang Li, Li Zhu, Paul F. A. Wright, Cuie Wen   +5 more
wiley   +1 more source

Habitability in 4D: Predicting the Climates of Earth Analogs across Rotation and Orbital Configurations

The Astrophysical Journal
Earth-like planets in the circumstellar habitable zone (HZ) may have dramatically different climate outcomes depending on their spin–orbit parameters, altering their habitability for life as we know it.
Arthur D. Adams, Christopher Colose, Aronne Merrelli, Margaret Turnbull, Stephen R. Kane   +4 more
doaj   +1 more source