scholarly journals Three-dimensional Direct Current Invisibility Cloak Produced with Bulk Materials

2021 ◽  
Author(s):  
Tianhang Chen ◽  
Pengyu Gong ◽  
Ruyi Song ◽  
Rongrong Zhu ◽  
Liqiao Jing ◽  
...  
Keyword(s):  
Direct Current ◽  
Three Dimensional ◽  
Bulk Materials ◽  
Invisibility Cloak

scholarly journals Multiscale Coupling of Transcranial Direct Current Stimulation to Neuron Electrodynamics: Modeling the Influence of the Transcranial Electric Field on Neuronal Depolarization

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Edward T. Dougherty ◽  
James C. Turner ◽  
Frank Vogel
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Three Dimensional ◽  
Human Head ◽  
Multiscale Model ◽  
Medical Intervention ◽  
Medical Community ◽  
Computational Grids ◽  
Direct Current Stimulation

Transcranial direct current stimulation (tDCS) continues to demonstrate success as a medical intervention for neurodegenerative diseases, psychological conditions, and traumatic brain injury recovery. One aspect of tDCS still not fully comprehended is the influence of the tDCS electric field on neural functionality. To address this issue, we present a mathematical, multiscale model that couples tDCS administration to neuron electrodynamics. We demonstrate the model’s validity and medical applicability with computational simulations using an idealized two-dimensional domain and then an MRI-derived, three-dimensional human head geometry possessing inhomogeneous and anisotropic tissue conductivities. We exemplify the capabilities of these simulations with real-world tDCS electrode configurations and treatment parameters and compare the model’s predictions to those attained from medical research studies. The model is implemented using efficient numerical strategies and solution techniques to allow the use of fine computational grids needed by the medical community.

scholarly journals Three dimensional complex plasma structures in a combined radio frequency and direct current discharge

2013 ◽  
Vol 20 (4) ◽  
pp. 043701 ◽  
Author(s):  
S. Mitic ◽  
B. A. Klumov ◽  
S. A. Khrapak ◽  
G. E. Morfill
Keyword(s):  
Radio Frequency ◽  
Direct Current ◽  
Three Dimensional ◽  
Current Discharge ◽  
Complex Plasma ◽  
Direct Current Discharge

scholarly journals Effect of direct current stressing to Cu–Cu bond interface imperfection for three dimensional integrated circuits

2013 ◽  
Vol 106 ◽  
pp. 149-154 ◽  
Author(s):  
Riko I Made ◽  
Peng Lan ◽  
Hong Yu Li ◽  
Chee Lip Gan ◽  
Chuan Seng Tan
Keyword(s):  
Integrated Circuits ◽  
Direct Current ◽  
Three Dimensional ◽  
Current Stressing ◽  
Bond Interface

scholarly journals Electronic structure of nickelates: From two-dimensional heterostructures to three-dimensional bulk materials

2010 ◽  
Vol 82 (23) ◽  
Author(s):  
P. Hansmann ◽  
A. Toschi ◽  
Xiaoping Yang ◽  
O. K. Andersen ◽  
K. Held
Keyword(s):  
Electronic Structure ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Bulk Materials

Numerical Investigation of Optimal Air Flowrate for Cooling 600 W Brushless Direct-Current Motor

2021 ◽  
Vol 13 (4) ◽  
Author(s):  
Hwabhin Kwon ◽  
Heesung Park
Keyword(s):  
Direct Current ◽  
Air Flow ◽  
Three Dimensional ◽  
Energy Utilization ◽  
Maximum Efficiency ◽  
Heat Sources ◽  
Additional Increase ◽  
Personal Mobility ◽  
Mobility Devices ◽  
Flow Through

Abstract Personal mobility devices have drawn growing attention to relieve the congestion of traffic and air pollution. The efficiency of electric motors is significant in terms of energy utilization, driving range, and lifetime of the devices. In this study, a brushless direct-current (BLDC) motor is numerically investigated to maximize the system efficiency. The inevitable energy losses in the motor are evaluated using heat sources generated in the motor components. The resulting copper and iron losses generate heat and decrease the motor efficiency. With these, the developed three-dimensional numerical model accurately predicts the temperature variations of the motor components in accordance with the experimental results. Numerical simulations are conducted by supplying air flow at a rate of 0 to 40 l/min. The results show that the decreased temperature at copper windings improves the efficiency of the motor as more air flowrate is supplied. Nonetheless, after the temperature at the copper windings reaches 42.5 °C at an air flow of 30 l/min, the temperature remains constant despite additional increase in the air flow. Through a comparison between the improved electrical work by cooling and the consumed energy to supply the air flowrate, the maximum efficiency of the air-cooled BLDC is found to be 86.3% with an optimal air flowrate of 30 l/min.

scholarly journals Three-dimensional polarization-independent visible-frequency carpet invisibility cloak

2011 ◽  
Vol 36 (11) ◽  
pp. 2059 ◽  
Author(s):  
Joachim Fischer ◽  
Tolga Ergin ◽  
Martin Wegener
Keyword(s):  
Three Dimensional ◽  
Invisibility Cloak ◽  
Visible Frequency ◽  
Polarization Independent
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