A Picowatt Energy Harvester

2011 ◽  
Vol 1299 ◽  
Author(s):  
Joe Evans ◽  
Johannes Smits ◽  
Carl Montross ◽  
Gerald Salazar
Keyword(s):  
Silicon Substrate ◽  
Energy Harvester ◽  
Bending Moment ◽  
Ferroelectric Film ◽  
The Self ◽  
Interdigitated Electrode ◽  
End Points ◽  
Thin Ferroelectric Film ◽  
Double Beam ◽  
Mems Device

ABSTRACTThe authors describe an energy harvester circuit fabricated with integrated thin ferroelectric film capacitors on a silicon substrate. The harvesting mechanism is a folded double-beam cantilever with proof masses at both end points. Interdigitated electrode capacitors are located at the three points on the folded cantilever that are expected to experience maximum bending moment and should produce up to 5V as a function of external vibration. The die has the dimensions of 1.6mm on a side and is designed to be mounted in a TO-18 package transistor-style package. Due to its small size, the self-contained piezoelectric MEMs device should produce 50 picowatts in a 1g vibration environment while occupying little space.

scholarly journals Binary Self-Assembly of Nanocolloidal Arrays using Concurrent and Sequential Spin Coating Techniques

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 274
Author(s):  
Shih-Jyun Shen ◽  
Demei Lee ◽  
Yu-Chen Wu ◽  
Shih-Jung Liu
Keyword(s):  
Silicon Substrate ◽  
Self Assembly ◽  
Spin Coating ◽  
Processing Parameters ◽  
The Self ◽  
Silicon Substrates ◽  
Processing Conditions ◽  
Polystyrene Spheres ◽  
Optimal Processing ◽  
Spin Coater

This paper reports the binary colloid assembly of nanospheres using spin coating techniques. Polystyrene spheres with sizes of 900 and 100 nm were assembled on top of silicon substrates utilizing a spin coater. Two different spin coating processes, namely concurrent and sequential coatings, were employed. For the concurrent spin coating, 900 and 100 nm colloidal nanospheres of latex were first mixed and then simultaneously spin coated onto the silicon substrate. On the other hand, the sequential coating process first created a monolayer of a 900 nm nanosphere array on the silicon substrate, followed by the spin coating of another layer of a 100 nm colloidal array on top of the 900 nm array. The influence of the processing parameters, including the type of surfactant, spin speed, and spin time, on the self-assembly of the binary colloidal array were explored. The empirical outcomes show that by employing the optimal processing conditions, binary colloidal arrays can be achieved by both the concurrent and sequential spin coating processes.

The self‐biased heterojunction effect of ferroelectric thin film on silicon substrate

1990 ◽  
Vol 67 (6) ◽  
pp. 2985-2991 ◽  
Author(s):  
Yuhuan Xu ◽  
Ching Jih Chen ◽  
Ren Xu ◽  
John D. Mackenzie
Keyword(s):  
Thin Film ◽  
Silicon Substrate ◽  
Ferroelectric Thin Film ◽  
The Self

Stabilization of a flexible pipe conveying fluid with an active boundary control method

2020 ◽  
Vol 26 (19-20) ◽  
pp. 1824-1834
Author(s):  
Beiming Yu ◽  
Hiroshi Yabuno ◽  
Kiyotaka Yamashita
Keyword(s):  
Flow Velocity ◽  
Control Method ◽  
Bending Moment ◽  
The Self ◽  
Pipe Conveying Fluid ◽  
Stabilization Method ◽  
Critical Flow Velocity ◽  
Complex Eigenvalues ◽  
Excited Oscillation ◽  
Conveying Fluid

A method of stabilizing the self-excited oscillation of a cantilevered pipe conveying fluid because of non–self-adjointness is proposed theoretically and experimentally. Complex eigenvalues denoting the natural frequency and damping of the system vary with an increase in the flow velocity. When the flow velocity exceeds a critical value, the flow-generated damping becomes negative and the pipe is dynamically destabilized. The complex eigenvalues with respect to flow velocity are affected by boundary conditions. We, thus, propose a stabilization control actuating the boundary condition. The stabilization method is carried out by applying a bending moment proportional to the bottom displacement of the pipe. The effect of the proposed control method is shown by investigating the stability for the three lowest modes of the system depending on the feedback gain. It is theoretically clarified that the critical flow velocity is increased by the proposed control method. Furthermore, experiments are performed using a fluid conveying pipe with two piezoactuators at the downstream end. The piezoactuators apply a bending moment at the downstream end of the pipe according to the theoretically proposed method. Experimental results verify that the proposed stabilization method suppresses the self-excited oscillation.

Nonlinear properties of thin ferroelectric film-based capacitors at elevated microwave power

2006 ◽  
Vol 89 (23) ◽  
pp. 232901 ◽  
Author(s):  
Oleg Soldatenkov ◽  
Tatyana Samoilova ◽  
Andrey Ivanov ◽  
Andrey Kozyrev ◽  
David Ginley ◽  
...  
Keyword(s):  
Microwave Power ◽  
Ferroelectric Film ◽  
Nonlinear Properties ◽  
Thin Ferroelectric Film

The Influence of Mismatch-Induced Field on Thin Ferroelectric Film Size Effects

2004 ◽  
Vol 64 (1) ◽  
pp. 17-38 ◽  
Author(s):  
M. D. GLINCHUK ◽  
A. N. MOROZOVSKA ◽  
E. A. ELISEEV
Keyword(s):  
Size Effects ◽  
Ferroelectric Film ◽  
Thin Ferroelectric Film ◽  
Induced Field

scholarly journals Improved Steel Beam-Column Connections in Industrial Structures

2020 ◽  
Vol 10 (1) ◽  
pp. 5126-5131 ◽  
Author(s):  
N. W. Bishay-Girges
Keyword(s):  
Bending Moment ◽  
Steel Beam ◽  
Bottom Flange ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Industrial Buildings ◽  
Double Beam ◽  
Steel Connection ◽  
Rigid Connection ◽  
Connection Design

Beam-to-column connection is a rigid connection used in steel moment frames which acts as the main resisting system in structural design. Haunches with double beam section height at the eave, ridge and crane bracket are usually used to resist the large bending moment at the critical locations of the steel frames. Damper devices can be used as the main source of producing forces used to reduce the bending moment due to different static and dynamic loads. This study focuses on improving the steel beam-column connection with the proposed control system in the eave connection which can also be used under the bracket which supports crane beam in industrial buildings. The purpose of this study is to describe the development of the beam-column steel connection incorporating dampers installed to beam bottom flange to reduce the effect of applied load on the frame without the need to create haunches to make the connection design more efficient.

scholarly journals Free-Standing PVDF/Reduced Graphene Oxide Film for All-Solid-State Flexible Supercapacitors towards Self-Powered Systems

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 198 ◽  
Author(s):  
Parthiban Pazhamalai ◽  
Vimal Kumar Mariappan ◽  
Surjit Sahoo ◽  
Woo Young Kim ◽  
Young Sun Mok ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Energy Harvester ◽  
The Self ◽  
Sodium Niobate ◽  
Oxide Composite ◽  
Charging System ◽  
Reduced Graphene

The development of polymer-based devices has attracted much attention due to their miniaturization, flexibility, lightweight and sustainable power sources with high efficiency in the field of wearable/portable electronics, and energy system. In this work, we proposed a polyvinylidene fluoride (PVDF)-based composite matrix for both energy harvesting and energy storage applications. The physicochemical characterizations, such as X-ray diffraction, laser Raman, and field-emission scanning electron microscopy (FE-SEM) analyses, were performed for the electrospun PVDF/sodium niobate and PVDF/reduced graphene oxide composite film. The electrospun PVDF/sodium niobate nanofibrous mat has been utilized for the energy harvester which shows an open circuit voltage of 40 V (peak to peak) at an applied compressive force of 40 N. The PVDF/reduced graphene oxide composite film acts as the electrode for the symmetric supercapacitor (SSC) device fabrication and investigated for their supercapacitive properties. Finally, the self-charging system has been assembled using PVDF/sodium niobate (energy harvester), and PVDF/reduced graphene oxide SSC (energy storage) and the self-charging capability is investigated. The proposed self-charging system can create a pathway for the all-polymer based composite high-performance self-charging system.

Effect of electrodes on the properties of a thin ferroelectric film

2008 ◽  
Vol 50 (3) ◽  
pp. 472-477 ◽  
Author(s):  
M. D. Glinchuk ◽  
V. Ya. Zaulychny ◽  
V. A. Stephanovich
Keyword(s):  
Ferroelectric Film ◽  
Thin Ferroelectric Film
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