Results 21 to 30 of about 4,889,516 (137)

Determination of physicochemical conditions and role of fluids in evolution of Geysour granitoid (eastern Gonabad), using biotite mineral chemistry

Journal of Economic Geology, 2021
Introduction The chemical composition of biotite in mineralization associated with granitoids and copper porphyry deposits is sensitive to several chemical and physical factors.
Ahmad Ahmadi Khalaji , Abdolsamad Pourmohammad , Mohammad Ebrahimi , Masoud Homam, Rasoul Esmaeili   +4 more
doaj   +1 more source

Effect of blade vibration on mulch tillage performance under silt clay loam soil [PDF]

Journal of Agricultural Machinery, 2015
Introduction: Mulch tillage system is an intermediate system which covers some of disadvantages of no tillage and conventional tillage systems. In farms in which tillage is done with a chisel plow, runoff and soil erosion have a less important relation ...
B Goudarzi, M. A Asoodar, N Kazemi
doaj   +1 more source

Voltage dependence of proton pumping by bacteriorhodopsin mutants with altered lifetime of the m intermediate [PDF]

, 2013
The light-driven proton pump bacteriorhodopsin (BR) from Halobacterium salinarum is tightly regulated by the [H+] gradient and transmembrane potential.
Friedrich, Thomas, Éva Lörinczi, Sven Geibel, Thomas Friedrich, Geibel, Sven, Bamberg, Ernst, Lörinczi, Èva, Ernst Bamberg, Lörinczi Èva, Friedrich, T., Bamberg Ernst, Geibel, S., Friedrich Thomas, Geibel Sven, Bamberg, E., Lörinczi, E.   +15 more
core   +2 more sources

Pitch System Input Contribution on Wind Turbine Main Shaft Bearing Currents

IEEE Access
Drivetrain reliability is a critical challenge for modern large-scale wind turbines, with electrically induced main shaft bearing currents acting as a major threat to bearing longevity.
Jian Zhao, Xuliang Zhu, Kefei Zhu, Ola Carlson   +3 more
doaj   +1 more source

Contribution Study of Different Common Mode Voltage Sources on Wind Turbine Main Shaft Bearing Currents

IEEE Access
Main shaft bearing failures in wind turbines have drawn increasing attention due to their high maintenance costs and operational risks. While previous studies have primarily focused on mechanical causes or bearing currents induced by generator-side ...
Jian Zhao, Xiaofei Lei, Xuliang Zhu, Kefei Zhu, Ola Carlson   +4 more
doaj   +1 more source

Bearing Capacity of Ring Foundations on Anisotropic and Heterogenous Clays: FEA, NGI‑ADP, and MARS [PDF]

, 2022
Axisymmetric solutions for the bearing capacity of ring foundation resting on anisotropic and heterogenous clays are presented in this paper using finite element analysis (FEA).
Shiau, Jim, Keawsawasvong, Suraparb, Lai, Van Qui, Tran, Duy Tan, Van Qui Lai, Suraparb Keawsawasvong, Duy Tan Tran, Jim Shiau   +7 more
core   +1 more source

A Self-Sensing Control Method for Active Magnetic Bearings Based on the Star-Point Voltage

Actuators
Methods for self-sensing position determination in active magnetic bearings enable a reduction in system costs and complexity. Many well-known methods rely on current measurements or their derivatives to estimate the rotor’s displacement relative to the ...
Jonah Vennemann, Niklas König, Rudolf Gerlich, Matthias Nienhaus   +3 more
doaj   +1 more source

Novel stator slot opening to reduce electrical machine bearing currents [PDF]

, 2023
Ball bearings are largely used in electrical machines, where the high frequency common mode currents affect their lifetime. This document presents a novel Zig-Zag stator slot opening geometry to reduce the winding-to-rotor capacitance Cwr with the ...
Geraint W. Jewell, De Gaetano, D., Xiao Chen, Sun, X., Xiangyu Sun, Chen, X., Wenjun Zhu, Antonio Griffo, Jewell, G.W., Zhu, W., Daniele De Gaetano, Griffo, A.   +11 more
core   +1 more source

Study on the Ultimate Bearing Capacity Performance of Composite Stiffened Tubular Joints

Buildings
TY-type intersecting joints are widely used in ultra-high voltage long-span transmission towers. To improve the ultimate bearing capacity of TY-type intersecting joints, this paper proposes a composite externally stiffened intersecting joint based on the
Qian Gao, Mengwei Zhu, Yiyang Lu, Xianda Guo, Fan Wen, Qiongfei Du, Qing Sun   +6 more
doaj   +1 more source

Using ANN and SVM for the Detection of Acoustic Emission Signals Accompanying Epoxy Resin Electrical Treeing

Applied Sciences, 2019
Electrical treeing is one of the effects of partial discharges in the solid insulation of high-voltage electrical insulating systems. The process involves the formation of conductive channels inside the dielectric.
Arkadiusz Dobrzycki, Stanisław Mikulski, Władysław Opydo   +2 more
doaj   +1 more source