Results 31 to 40 of about 14,428 (257)

Oligothiophene wires: impact of torsional conformation on the electronic structure

Physical Chemistry Chemical Physics, 2016
Different torsional conformations of alkyl-substituted oligothiophenes show nearly identical progressions of particle-in-a-box-like electronic orbitals.
D A, Kislitsyn, B N, Taber, C F, Gervasi, L, Zhang, S C B, Mannsfeld, J S, Prell, A L, Briseno, G V, Nazin   +7 more
openaire   +3 more sources

Neurovascular Contacts in the Pathophysiology of Neuralgic Amyotrophy: An Observational Study

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Neuralgic amyotrophy (NA) is a prevalent, monophasic, multifocal immune‐mediated neuropathy. A distinctive characteristic of the disease is the occurrence of nerve or fascicle constrictions and torsions (NA‐associated focal nerve lesions, NAFL). The pathophysiology underlying this phenomenon remains to be fully elucidated.
Johannes Fabian Holle, Andreas Leha, Volker Limmroth, Wolfram Windisch, Maximilian Zimmermann   +4 more
wiley   +1 more source

Study on ROP Enhancement of Composite Percussive Drilling in Deep Tight Shale

Xinjiang shiyou tianranqi
To address the challenges of high compressive strength，low drillability，and extended drilling time in the deep tight shale of the Mabei Fengcheng Formation，an experimental study on drilling parameter optimization for axial-torsional coupled percussive ...
MU Zongjie, QIU Zilun, FANG Yan, YANG Zhehua, SHI Jiangang, ZHANG Panpan   +5 more
doaj   +1 more source

Torsional Resonance Identification in Turbine-Generator Shaft Due to the Operation of Electric Arc Furnaces at Steel Mills in Bangladesh Power System

IEEE Access, 2023
Many steel mills in Bangladesh use electric arc furnaces (EAFs) that can impact the generating units of the country’s power system. The EAFs can cause power quality problems, such as the injection of the sub-synchronous frequencies (SSFs), which ...
Md. Minarul Islam, Abdul Hasib Chowdhury, Md. Shafiullah, Kashem M. Muttaqi, Danny Sutanto, Taha Selim Ustun   +5 more
doaj   +1 more source

Gravity‐Dependent Modulation of Downbeat Nystagmus: Insights From Velocity‐Storage Dysfunction

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Downbeat nystagmus varies with head position, a phenomenon termed gravity‐dependent modulation. We aimed to clarify its mechanism using a velocity‐storage model. Methods In 10 patients with downbeat nystagmus due to cerebellar disorders, we recorded eye movements at different pitch‐ and roll‐axis head positions.
Ji‐Hyung Park, Eun‐Hyuk Choi, Jorge Otero‐Millan, David S. Zee, Jeong‐Yoon Choi, Ji‐Soo Kim   +5 more
wiley   +1 more source

The effect of high-frequency torsional impacts on the dynamic response of a drill string in a stick state

Advances in Mechanical Engineering, 2019
Stick–slip vibration is common in the oil well drilling process and is detrimental to down-hole equipment and drilling efficiency. In recent years, a new type of drilling technology, torsional impact drilling, has been developed to mitigate the stick ...
Liping Tang, Wei He, Xiaohua Zhu
doaj   +1 more source

On the torsional energy of torus knots under infinitesimal bending

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2023
The article deals with the infinitesimal bending theory application to the knots theory. The impact of infinitesimal bending on the torsional energy at torus knots is considered, and the results show that it is not stationary under infinitesimal bending.
Maksimović Miroslav D., Rančić Svetozar R., Najdanović Marija S., Velimirović Ljubica S., Ljajko Eugen S.   +4 more
doaj   +1 more source

A Numerical–Experimental Approach for Multi‐Matrix Fiber‐Reinforced Plastics Characterization Using Finite Element Model Updating

Advanced Engineering Materials, EarlyView.
A numerical–experimental framework is developed for characterizing multi‐matrix fiber‐reinforced polymers (MM‐FRPs) combining epoxy and polyurethane matrices. Harmonic bending tests are integrated with finite element model updating (FEMU) to simultaneously identify elastic and viscoelastic material parameters.
Rodrigo M. Dartora, Tales V. Lisbôa, Axel Spickenheuer, Rogério J. Marczak, Jakson M. Vassoler   +4 more
wiley   +1 more source

Experimental Study on Mechanical Specific Energy Optimization in Axial–Torsional Coupled Impact Drilling

Applied Sciences
Axial–torsional coupled impact drilling (ATCID) technology represents a promising solution for overcoming the drilling challenges posed by conglomerate formations, which are characterized by strong heterogeneity, high abrasiveness, and poor drillability.
Chuanming Xi, Desheng Wu, Chuanzhen Zang, Shen Wang, Yong Guo, Zongjie Mu, Zhehua Yang   +6 more
doaj   +1 more source

Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys

Advanced Engineering Materials, EarlyView.
This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa, Aparna Saksena, Alesander Kostka, Pascal Thome, Felicitas Scholz, Alexandre Mussi, Christoph Somsen, Baptiste Gault, Jan Frenzel, Gunther Eggeler   +9 more
wiley   +1 more source