Unprecedented Optoelectronic Function in Organic Conductor: Memory Effect of Photoswitching Controlled by Voltage Pulse Width

2009 ◽  
Vol 113 (11) ◽  
pp. 4654-4661 ◽  
Author(s):  
Toshifumi Iimori ◽  
Toshio Naito ◽  
Nobuhiro Ohta
Keyword(s):  
Memory Effect ◽  
Voltage Pulse ◽  
Pulse Width ◽  
Organic Conductor

Substantial Reduction of Reset Current in CoO RRAM with Ta Bottom Electrode

2008 ◽  
Vol 1071 ◽  
Author(s):  
Hisashi Shima ◽  
Fumiyoshi Takano ◽  
Yukio Tamai ◽  
Hidenobu Muramatsu ◽  
Hiroyuki Akinaga ◽  
...  
Keyword(s):  
Voltage Pulse ◽  
Pulse Width ◽  
High Speed ◽  
Bottom Electrode ◽  
Substantial Reduction ◽  
Resistance Switching ◽  
Forming Process ◽  
Height Dependence ◽  
Load Resistor ◽  
Resistance Component

AbstractThe resistance switching in Pt/Co-O/Pt and Ta/Co-O/Pt has been investigated. Compared to Pt/Co-O/Pt, the reset current was more efficiently decreased in Ta/Co-O/Pt by using the load resistor in the forming process, indicating that the embedded resistance component with little parasitic capacitance effectively limits the current in the forming process. The reset process with the reset current lower than 0.15 mA was successfully demonstrated in Ta/Co-O/Pt. In addition, the high speed resistance switching by the voltage pulse with the pulse width of 20 ns was carried out, by investigating the pulse voltage height dependence of reset speed in Ta/Co-O/Pt.

scholarly journals Activation of platelet-rich plasma by pulse electric fields: Voltage, pulse width and calcium concentration can be used to control and tune the release of growth factors, serotonin and hemoglobin

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0249209
Author(s):  
Bogdan Neculaes ◽  
Andrew L. Frelinger ◽  
Anja J. Gerrits ◽  
Thomas Gremmel ◽  
Emma E. Forde ◽  
...  
Keyword(s):  
Growth Factors ◽  
Growth Factor ◽  
Electric Fields ◽  
Voltage Pulse ◽  
Pulse Width ◽  
Calcium Concentration ◽  
Platelet Rich Plasma ◽  
Clot Formation ◽  
Bovine Thrombin ◽  
Pulse Electric

Activated platelet-rich plasma (PRP) has been used in the clinical settings of wound healing and regenerative medicine, with activation typically induced by the addition of bovine thrombin. To eliminate issues with availability, cost and potential side effects associated with bovine thrombin, ex vivo PRP activation using pulse electric fields (PEF) has been proposed and demonstrated. The present study characterizes the effect of PEF voltage and pulse width, in combination with a range of calcium concentrations, on clot formation, growth factor release, and serotonin (5-HT) release from dense granules. The main findings are: 1) increasing calcium concentrations with most PEF conditions leads to increased levels of PDGF and 5-HT release; 2) whether EGF levels increase or decrease with increasing calcium concentration depends on the specific PEF parameters; 3) the pattern of PDGF and EGF levels in supernatants suggest that these molecules are localized differently within platelets; 4) significant levels of PDGF, EGF, and 5-HT can be released without inducing clot formation or hemoglobin release. In conclusion, voltage, pulse width and calcium concentration can be used to control and tune the release of growth factors, serotonin and hemoglobin from PEF-activated PRP. Because growth factor requirements vary for different types of wounds and for wounds at different stages of healing, the unique balance of factors in supernatants of PEF-activated PRP may provide more clinically advantageous than the current standard of bovine thrombin-activated PRP.

P‐1.12: Effects of Gate Voltage Pulse Width and Amplitude on Eliminating Persistent Photoconductivity in Amorphous InZnO TFTs

2021 ◽  
Vol 52 (S2) ◽  
pp. 703-706
Author(s):  
Changhui Fan ◽  
Yu Xin ◽  
Ludong Qin ◽  
Xiaoliang Zhou ◽  
Shengdong Zhang
Keyword(s):  
Gate Voltage ◽  
Voltage Pulse ◽  
Pulse Width ◽  
Persistent Photoconductivity

Deposition of Nano-Scale Ga Dots onto HF-Treated Si(111) Using a Scanning Tunneling Microscope

1992 ◽  
Vol 279 ◽  
Author(s):  
Katsuhiro Uesugi ◽  
Kiyoshi Sakata ◽  
Seiji Kawano ◽  
Masamichi Yoshimura ◽  
Takafumi Yao
Keyword(s):  
Electric Field ◽  
Scanning Tunneling Microscope ◽  
Voltage Pulse ◽  
Pulse Width ◽  
Pulse Height ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Nano Scale ◽  
Positive Voltage ◽  
Tentative Model

ABSTRACTNano-scale Ga dots are deposited through the decomposition of triethylgallium (TEGa) adsorbed on HF-treated Si(111) surfaces using a scanning tunneling microscope (STM). The deposition of Ga dots of 2–13 nm in diameter is achieved by applying a negative voltage pulse to the sample, while no deposition is observed when a positive voltage pulse is applied. The conditions for Ga deposition are systematically investigated by varying the gap conductance, pulse height, and pulse width. A tentative model for the mechanism of Ga deposition is proposed, in which TEGa molecules are decomposed by the electric field between the tip and the sample.

scholarly journals Design of a High Voltage Pulse Generator with Large Width Adjusting Range for Tumor Treatment

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1053
Author(s):  
Xin Rao ◽  
Xiaodong Chen ◽  
Jun Zhou ◽  
Bo Zhang ◽  
Yasir Alfadhl
Keyword(s):  
High Voltage ◽  
Voltage Pulse ◽  
Pulse Width ◽  
Pulse Generator ◽  
Biological Effects ◽  
High Voltage Pulse ◽  
Tumor Treatment ◽  
Capacitor Array ◽  
High Voltage Pulse Generator ◽  
Voltage Pulse Generator

The unique biological effects stimulated by short pulsed electric field have many applications in tumor treatment, such as irreversible electroporation, electrochemotherapy, gene transfection and immune therapy. These biological effects require high voltage pulses with different pulse width in the range from nanoseconds to hundreds of microseconds. To fulfill this requirement, a compact high voltage pulse generator has been designed based on a switchable capacitor array and a SiC MOSFET switching array. The proposed pulse generator has one output channel with an adjustable pulse width from 100 ns to 100 µs, an amplitude range from 0 kV to 2 kV, a repetition rate less than 1.2 kHz and a voltage drop less than 5%. The mechanism of the stacked switches circuit was investigated, in connection with a switchable capacitor array. The introduction of a switchable capacitor array extends the pulse width from nanosecond scale and microsecond scale compared with other similar design methods. The pulse generator has been designed in simulation and implemented in experiment. The developed pulse generator provides a convenient and economical tool for the further studies of the unique biological effects stimulated by different pulsed electric fields for tumor treatment.

Switching Characteristics of a Locally-Active Memristor with Binary Memories

2019 ◽  
Vol 29 (11) ◽  
pp. 1930030 ◽  
Author(s):  
Jiajie Ying ◽  
Guangyi Wang ◽  
Yujiao Dong ◽  
Simin Yu
Keyword(s):  
Voltage Pulse ◽  
Pulse Width ◽  
Pulse Sequence ◽  
Equilibrium Points ◽  
Stable State ◽  
Active Regions ◽  
Pulse Amplitude ◽  
Chaotic Oscillator ◽  
Stable States ◽  
Local Activity

A number of important applications would benefit from the introduction of locally-active memristors, which is defined to be any memristor that exhibits negative differential memristance for at least a voltage or a current applied to the memristor. Two leading examples are emerging nonvolatile memory based on memristor-based crossbar array architectures, and neural networks that exhibit improved computational complexity when operated at the edge of chaos. In this paper, a novel locally-active memristor model is presented for exploring the nonvolatile and switching mechanism of the memristor and the influence of local activity on the complexity of nonlinear circuits. We find that the memristor possesses three locally-active regions in its DC [Formula: see text]–[Formula: see text] plot and two asymptotically stable states (equilibrium points) on its power-off plot (POP) where voltage [Formula: see text], implying that the memristor is bistable, which can be used as a nonvolatile binary memory or binary switch. We also find the mechanism and the rule of switching between the two stable states by applying a single square voltage pulse of appropriate pulse width and pulse amplitude. We show that it is always possible to switch from one stable state to another of the memristor with an appropriate pulse amplitude and a pulse width, and that there is a trade-off between the voltage pulse amplitude and the pulse width for the faster switching between the two equilibrium points. We also show that fast switching between the two states is possible by using a periodic bipolar narrow pulse sequence. Local activity depends on the capability of a memristor circuit to amplify infinitesimal fluctuations in energy. Based on this principle, we designed a simplest chaotic oscillator that utilizes only three components in parallel: the proposed locally-active memristor, a linear capacitor and an inductor, which can oscillate around an equilibrium point located on its DC [Formula: see text]–[Formula: see text] plot. Its dynamic characteristics are verified by theoretical analyses, simulations and DSP experiments.

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