Results 51 to 60 of about 5,901,072 (257)

Fold principal axis - a new tool for defining the orientations of rotational symmetric shapes [PDF]

, 2009
[[abstract]]A new type of principal axis, namely, fold principal axis, is introduced in this paper, which can be used to define the orientations of rotationally symmetric shapes.
S. L. Chou;J. C. Lin;W. H. Tsai
core  

Off-vertical axis rotation of the visual field and nauseogenicity

, 2009
BACKGROUND: Off-vertical axis rotation (OVAR) causes motion sickness which increases with angle of tilt and is most provocative around 0.2 Hz. The aim was to determine the tilt angle and frequency characteristics for visual OVAR, which is also known to ...
Arun, S., Wotton-Hamrioui, K., Wortley, E., Golding, J.F., Gresty, M.A., Cousins, S.   +5 more
core   +1 more source

Effect of principal stress rotation on dynamic characteristics of a sandy seabed under a partially reflected standing wave

, 2020
Principal stress rotation (PSR) is one of the main stress conditions for a soil element subject to cyclic waves. It is one of the main causes behind generation of excess pore water pressure and cumulative plastic strain in soil deposits when drainage ...
Jeng, DS, Zhu, JF, Zhao, HY
core   +1 more source

A full-plane strain complex variable analytical model considering three-dimensional principal stress rotation and its engineering applications

International Journal of Coal Science & Technology
To explore the influence of stress space rotation on roadway stability, this study establishes Cartesian and principal stress axes, obtains principal stress characteristic parameters and direction cosine matrix, and determines the conversion process ...
Zijun Han, Hongtao Liu, Linfeng Guo, Wencong Cheng, Jialu Liang, Zihan Chen, Xiaofei Guo, Haozhu Wang   +7 more
doaj   +1 more source

Development and verification of large-scale true triaxial apparatus with rigid-flexible-flexible loading boundary mechanism

Yantu gongcheng xuebao, 2019
The true triaxial apparatus is the key equipment to study the variation laws of the deformation strength of soils under the action of three-dimensional principal stress. It is also a test instrument for theoretical study of geotechnical mechanics. On the
SHAO Sheng-Jun 1,2, WANG Yong-xin 1
doaj   +1 more source

Study on the Ultimate Supporting Force of Shield Excavation Face Based on Anisotropic Strength Theory

Applied Sciences, 2020
The determination of the ultimate supporting force of the shield excavation face is an important problem to be solved in shield construction. Considering that the tunnel burial depth ratio has a significant effect on the instability mode of the ...
Chunquan Dai, Hongtao Sui, Chao Ma
doaj   +1 more source

Distinct Microstructural Characteristic Lengths Defining Notch Fatigue Crack Initiation and Propagation, and Defect Tolerance in Advanced Steels

Advanced Engineering Materials, EarlyView.
Schematic representation of modes of microcrack nucleation, growth and temporary arrestment at different boundaries, with the criteria for crack propagation in three scenarios: (1) large notch, (2) defect/small sharp notch, and (3) long crack. This work revisits and integrates results on the fatigue behavior of advanced bainitic steels (in particular ...
Lucia Morales‐Rivas
wiley   +1 more source

Mechanical Properties of Frozen Loess Subject to Directional Shear Effects from Multiple Principal Stress Directions

Eng
Frozen loess is extensively distributed across seasonally frozen regions, where its mechanical behavior plays a critical role in the stability of engineering structures such as foundations, tunnels, and slopes.
Jianhong Fang, Chenwei Wang, Binlong Zhang, Qingzhi Wang   +3 more
doaj   +1 more source

Microstructure Modification of Additively Manufactured Mo–9Si–8B by Annealing and Its Effects on High‐Temperature Mechanical Properties

Advanced Engineering Materials, EarlyView.
Postbuild annealing systematically modifies the phase fractions and morphology of EB‐PBF processed Mo–9Si–8B. Quantitative microstructure–property correlations reveal how controlled phase evolution enhances high‐temperature compressive strength and creep resistance.
Christopher Schmidt, Yong Chen, Georg Hasemann, Benjamin Wahlmann, Carolin Körner, Manja Krüger   +5 more
wiley   +1 more source

Impact of Gene-Gender Effects of Adrenergic Polymorphisms on Hypothalamic-Pituitary-Adrenal Axis Activity in Depressed Patients [PDF]

, 2008
Objective: There is overwhelming evidence that activation of the hypothalamic-pituitary-adrenal (HPA) system plays a major role in depression and cardiovascular disease in genetically susceptible individuals.
Bondy, Brigitta, Baghai, Thomas C., Spraul, M., Zill, P., Rupprecht, R., Eser, D., Schule, C., Haefner, S.   +7 more
core   +1 more source