Linear invariants and the quantum dynamics of a nonstationary mesoscopic RLC circuit with a source

2014 ◽  
Vol 28 (27) ◽  
pp. 1450212 ◽  
Author(s):  
I. A. Pedrosa ◽  
J. L. Melo ◽  
E. Nogueira
Keyword(s):  
Quantum Dynamics ◽  
Power Source ◽  
Oscillation Circuit ◽  
Uncertainty Product ◽  
Rlc Circuit ◽  
External Power ◽  
Arbitrary Weight ◽  
Gaussian Packet ◽  
Mesoscopic Rlc Circuit ◽  
Linear Invariants

In this paper, we use Hermitian linear invariants and the Lewis and Riesenfeld invariant method to obtain the general solution of the Schrödinger equation for a mesoscopic RLC circuit with time-dependent resistance, inductance, capacitance and a power source and represent it in terms of an arbitrary weight function. In addition, we construct Gaussian wave packet solutions for this electromagnetic oscillation circuit and employ them to calculate the quantum fluctuations of the charge and the magnetic flux as well as the associated uncertainty product. We also show that the width of the Gaussian packet and the fluctuations do not depend on the external power.

Combining a Fuel Cell and Ultracapacitor Bank to Power a Vertical Take-Off and Landing Unmanned Aerial System

2020 ◽  
Author(s):  
Justin A. Laddusaw ◽  
Anthony G. Pollman ◽  
Oleg A. Yakimenko ◽  
Anthony J. Gannon
Keyword(s):  
Fuel Cell ◽  
Power Management ◽  
Power Source ◽  
Unmanned Aerial System ◽  
Hybrid Powertrain ◽  
Instantaneous Power ◽  
Power Profile ◽  
External Power ◽  
Future Work ◽  
Secondary Power

Abstract This research investigated the combination of a fuel cell and ultracapacitors to create a hybrid powertrain for a vertical take-off unmanned aerial system (UAS). This replaced the more common battery-only powertrain or the hybrid fuel cell-battery powertrain. A secondary power source, such as a battery or ultracapacitors, is required to assist a fuel cell with immediate load requests because fuel cells are unable to supply instantaneous power. The fuel cell-ultracapacitor was tested using a power profile that was experimentally determined using a battery-powered vertical take-off UAS during take-off, hover, and landing. This tabletop experiment is meant to lead to a more refined solution that can be easily scaled to fit into a smaller future vertical take-off UAS. Two separate ultracapacitor banks were made to be put in parallel with the fuel cell. The first was a series of 14, 650 Farad ultracapacitors and the second was a series of 14, 350 Farad ultracapacitors. Both fuel cell-ultracapacitor powertrains were able to meet the power requirements while also supplying power to the fuel cell itself, without an external power supply. Future work opportunities include scaling for implementation into a UAS platform and coding the power management software to optimally manage the proposed hybrid powertrain.

Precise quantitative addition of multiple reagents into droplets in sequence using glass fiber-induced droplet coalescence

The Analyst ◽  
2015 ◽  
Vol 140 (3) ◽  
pp. 701-705
Author(s):  
Chunyu Li ◽  
Jian Xu ◽  
Bo Ma
Keyword(s):  
Glass Fiber ◽  
Power Source ◽  
Droplet Coalescence ◽  
External Power Source ◽  
External Power ◽  
Serial Addition

Serial addition of reagents with controlled volumes is performed using a glass fiber-induced droplet coalescence method without the requirement for an external power source.

scholarly journals Noiseless intensity amplification of repetitive signals by coherent addition using the temporal Talbot effect

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Reza Maram ◽  
James Van Howe ◽  
Ming Li ◽  
José Azaña
Keyword(s):  
Optical Pulse ◽  
Wave Train ◽  
Extinction Ratio ◽  
Power Source ◽  
Wave System ◽  
Talbot Effect ◽  
Physical Processes ◽  
External Power Source ◽  
External Power ◽  
Time Average

Abstract Amplification of signal intensity is essential for initiating physical processes, diagnostics, sensing, communications and measurement. During traditional amplification, the signal is amplified by multiplying the signal carriers through an active gain process, requiring the use of an external power source. In addition, the signal is degraded by noise and distortions that typically accompany active gain processes. We show noiseless intensity amplification of repetitive optical pulse waveforms with gain from 2 to ~20 without using active gain. The proposed method uses a dispersion-induced temporal self-imaging (Talbot) effect to redistribute and coherently accumulate energy of the original repetitive waveforms into fewer replica waveforms. In addition, we show how our passive amplifier performs a real-time average of the wave-train to reduce its original noise fluctuation, as well as enhances the extinction ratio of pulses to stand above the noise floor. Our technique is applicable to repetitive waveforms in any spectral region or wave system.

A photovoltaic self-powered gas sensor based on a single-walled carbon nanotube/Si heterojunction

Nanoscale ◽  
2017 ◽  
Vol 9 (47) ◽  
pp. 18579-18583 ◽  
Author(s):  
L. Liu ◽  
G. H. Li ◽  
Y. Wang ◽  
Y. Y. Wang ◽  
T. Li ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Visible Light ◽  
Gas Sensor ◽  
Power Source ◽  
Single Walled Carbon Nanotube ◽  
External Power Source ◽  
External Power ◽  
Gas Molecules ◽  
Self Powered ◽  
Trace Concentrations

A self-powered gas sensor activated by visible light which can detect trace concentrations of gas molecules without an external power source.

Equivalent Analogy of Mesoscopic RLC Circuit and Its Thermal Effect

2010 ◽  
Vol 49 (8) ◽  
pp. 1768-1774
Author(s):  
Bao-Long Liang ◽  
Ji-Suo Wang ◽  
Shi-Xue Song ◽  
Xiang-Guo Meng
Keyword(s):  
Thermal Effect ◽  
Rlc Circuit ◽  
Mesoscopic Rlc Circuit

Portable Pneumatic Power-Harvesting Ankle-Foot-Orthosis

2008 ◽  
Author(s):  
Robin Chin ◽  
Elizabeth T. Hsiao-Wecksler ◽  
Eric Loth ◽  
Andrew Alleyne ◽  
Scott Manwaring ◽  
...  
Keyword(s):  
Power Source ◽  
Power Harvesting ◽  
Ankle Motion ◽  
Ankle Foot Orthosis ◽  
Locking Mechanism ◽  
External Power Source ◽  
Cam Follower ◽  
External Power ◽  
Pneumatic Power ◽  
Foot Orthosis

In this paper, we present a novel ankle-foot-orthosis (AFO) design that controls ankle motion by providing a plantarflexion stop with free dorsiflexion during gait. The biomechanical controls are accomplished with a unique application of a cam-follower design that uses pneumatic power harvested via an air bellow embedded into the insole of the AFO (Figure 1). This portable design is self-contained and does not require any external power source to provide for the plantarflexion stop locking mechanism. It is the first step in a series of untethered fluid-powered orthotic devices.

scholarly journals A 3D-printed hand-powered centrifuge for molecular biology

2019 ◽  
Author(s):  
Gaurav Byagathvalli ◽  
Aaron F. Pomerantz ◽  
Soham Sinha ◽  
Janet Standeven ◽  
M. Saad Bhamla
Keyword(s):  
Molecular Biology ◽  
Low Cost ◽  
Power Source ◽  
Medical Diagnostics ◽  
Resource Limited Settings ◽  
Resource Limited ◽  
External Power Source ◽  
External Power ◽  
3D Printed ◽  
Proof Of Principle

The centrifuge is an essential tool for many aspects of research and medical diagnostics. However, conventional centrifuges are often inaccessible outside of conventional laboratory settings, such as remote field sites, require a constant external power source, and can be prohibitively costly in resource-limited settings and STEM-focused programs. Here we present the 3D-Fuge, a 3D-printed hand-powered centrifuge, as a novel alternative to standard benchtop centrifuges. Based on the design principles of a paper-based centrifuge, this 3D-printed instrument increases the volume capacity to 2 mL and can reach hand-powered centrifugation speeds up to 6,000 rpm. The 3D-Fuge devices presented here are capable of centrifugation of a wide variety of different solutions such as spinning down samples for biomarker applications and performing nucleotide extractions as part of a portable molecular lab setup. We introduce the design and proof-of-principle trials that demonstrate the utility of low-cost 3D printed centrifuges for use in remote and educational settings.

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