Diemissive Dye@CP composites with full-spectrum tunable mechanoluminescence

2021 ◽  
Author(s):  
Jiaxiang Huang ◽  
He Zhao ◽  
Jian-Jun Zhang ◽  
Zhang bolun ◽  
Jun Ni ◽  
...  
Keyword(s):  
Control Strategy ◽  
Full Spectrum ◽  
Practical Applications ◽  
Precise Control ◽  
Before And After

The difficulty of precise control of the luminescence colour before and after grinding of mechanoluminescence (MCL) materials has limited their practical applications. Herein we report a doping dye control strategy...

scholarly journals Randomized Projection Learning Method for Dynamic Mode Decomposition

Mathematics ◽  
2021 ◽  
Vol 9 (21) ◽  
pp. 2803
Author(s):  
Sudam Surasinghe ◽  
Erik Bollt
Keyword(s):  
Dimensional Space ◽  
Low Cost ◽  
Random Projection ◽  
Dynamic Mode Decomposition ◽  
Projection Algorithm ◽  
Dynamic Mode ◽  
Operator Matrix ◽  
Full Spectrum ◽  
Practical Applications ◽  
Mode Decomposition

A data-driven analysis method known as dynamic mode decomposition (DMD) approximates the linear Koopman operator on a projected space. In the spirit of Johnson–Lindenstrauss lemma, we will use a random projection to estimate the DMD modes in a reduced dimensional space. In practical applications, snapshots are in a high-dimensional observable space and the DMD operator matrix is massive. Hence, computing DMD with the full spectrum is expensive, so our main computational goal is to estimate the eigenvalue and eigenvectors of the DMD operator in a projected domain. We generalize the current algorithm to estimate a projected DMD operator. We focus on a powerful and simple random projection algorithm that will reduce the computational and storage costs. While, clearly, a random projection simplifies the algorithmic complexity of a detailed optimal projection, as we will show, the results can generally be excellent, nonetheless, and the quality could be understood through a well-developed theory of random projections. We will demonstrate that modes could be calculated for a low cost by the projected data with sufficient dimension.

HIL Testbed and Motion Control Strategy for the Hybrid Hydraulic-Electric Architecture (HHEA)

2021 ◽  
Author(s):  
Arpan Chatterjee ◽  
Perry Y. Li
Keyword(s):  
Motion Control ◽  
Control Strategy ◽  
Control Strategies ◽  
Electric Machines ◽  
Hardware In The Loop ◽  
System Efficiency ◽  
Electric Motors ◽  
Test Bed ◽  
Road Vehicles ◽  
Precise Control

Abstract The Hybrid Hydraulic-Electric Architecture (HHEA) was proposed in recent years to increase system efficiency of high power mobile machines and to reap the benefits of electrification without the need for large electric machines. It uses a set of common pressure rails to provide the majority of power hydraulically and small electric motors to modulate that power for precise control. This paper presents the development of a Hardware-in-the-loop (HIL) test-bed for testing motion control strategies for the HHEA. Precise motion control is important for off-road vehicles whose utility requires the machine being dexterous and performing tasks exactly as commanded. Motion control for the HHEA is challenging due to its intrinsic use of discrete pressure rail switches to minimize system efficiency or to keep the system within the torque capabilities of the electric motor. The motion control strategy utilizes two different controllers: a nominal passivity based back-stepping controller used in between pressure rail switches and a transition controller used to handle the event of a pressure rail switch. In this paper, the performance of the nominal control under various nominal and rail switching scenarios is experimentally evaluated on the HIL testbed.

scholarly journals Location-Based Tracking Data and Customer Movement Pattern Analysis Using for Sustainable Fashion Business

2019 ◽  
Vol 11 (22) ◽  
pp. 6209 ◽  
Author(s):  
Jonghyuk Kim ◽  
Hyunwoo Hwangbo ◽  
Sung Jun Kim ◽  
Soyean Kim
Keyword(s):  
Field Experiments ◽  
Pattern Analysis ◽  
Movement Patterns ◽  
Movement Pattern ◽  
Tracking Data ◽  
Discrete Location ◽  
Practical Applications ◽  
Before And After ◽  
Stay Time ◽  
Visual Merchandising

Retailers need accurate movement pattern analysis of human-tracking data to maximize the space performance of their stores and to improve the sustainability of their business. However, researchers struggle to precisely measure customers’ movement patterns and their relationships with sales. In this research, we adopt indoor positioning technology, including wireless sensor devices and fingerprinting techniques, to track customers’ movement patterns in a fashion retail store over four months. Specifically, we conducted three field experiments in three different timeframes. In each experiment, we rearranged one element of the visual merchandising display (VMD) to track and compare customer movement patterns before and after the rearrangement. For the analysis, we connected customers’ discrete location data to identify meaningful patterns in customers’ movements. We also used customers’ location and time information to match identified movement pattern data with sales data. After classifying individuals’ movements by time and sequences, we found that stay time in a particular zone had a greater impact on sales than the total stay time in the store. These results challenge previous findings in the literature that suggest that the longer customers stayed in a store, the more they purchase. Further, the results confirmed that effective store rearrangement could change not only customer movement patterns but also overall sales of store zones. This research can be a foundation for various practical applications of tracking data technologies.

Precise Control of Carbon Nanotube Synthesis of a Single Chirality

2007 ◽  
Author(s):  
David R. Huitink ◽  
Debjyoti Banerjee ◽  
Saion K. Sinha
Keyword(s):  
Gas Flow ◽  
Chemical Vapor ◽  
Synthesis Conditions ◽  
Precise Control ◽  
Catalyst Composition ◽  
Cvd Synthesis ◽  
Before And After ◽  
Characterization Studies ◽  
Uniform Diameter ◽  
Carbon Nanotube Synthesis

This work demonstrates precise control over the synthesis conditions and location during CNT formation, such that single chirality tubes are obtainable. This technique obviates two significant hurdles that prevent the exploitation of CNTs in micro- and nano-devices. Microelectronic applications require precise location and chirality of synthesized CNTs. Conventional CVD synthesis techniques typically yield mixtures of CNTs (semi-conducting and metallic types) that grow at random locations. Dip Pen Nanolithography (DPN) techniques were used to deposit the catalysts at precisely defined locations and to pattern the catalysts on a substrate with specific sizes as well as to control the catalyst composition. After deposition of catalysts, a low temperature Chemical Vapor Deposition (CVD) process was used to synthesize CNT. Various known catalysts were deposited. Characterization studies before and after CVD synthesis of CNT showed that the CNT were of a single chirality as well as uniform diameter (with a very narrow range of variability). The results indicate that the chirality of the synthesized CNT can be controlled by changing the synthesis conditions (e.g., size of the catalyst patterns, composition of the catalysts, temperature of CVD, gas flow rates, etc.).

scholarly journals Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

2020 ◽  
Vol 17 (5) ◽  
pp. 1602 ◽  
Author(s):  
Fei Huang ◽  
Lu Zhang ◽  
Ren-Ren Wu ◽  
Si-Ming Zhang ◽  
Rong-Bo Xiao
Keyword(s):  
Ion Exchange ◽  
Magnetic Separation ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Chicken Manure ◽  
Relative Distribution ◽  
Order Kinetic ◽  
Practical Applications ◽  
Adsorption Mechanisms ◽  
Before And After

The present study investigated the adsorption of Cd2+ by nonmagnetic and magnetic biochars (CMB and M-CMB) derived from chicken manure, respectively. The adsorption characteristics were investigated as a function of initial pH, contact time, initial Cd2+ concentration and magnetic separation. Adsorption process of both biochars were better described by Pseudo-second-order kinetic equation and Freundlich isotherm model, which were spontaneous and endothermic in nature. It was found that maximum capacities were 60.69 and 41.07 mg/g obtained at the initial Cd2+ concentration of 180 mg/L for CMB and M-CMB, and the turbidity of adsorption-treated solution was reduced from 244.3 to 11.3 NTU after magnetic separation of 0.5 min. These indicated that M-CMB had lower adsorption capacity of Cd2+ than CMB, though it was successfully separated from the treated solutions. Furthermore, both biochars before and after adsorption were analyzed by SEM-EDS, XRD and FTIR. Adsorption mechanisms mainly included precipitation, ion-exchange, complexation and Cπ-coordination, in which precipitation and ion-exchange dominated the adsorption process by CMB, while in M-CMB, precipitation was always predominant mechanism, followed by ion-exchange. The two other mechanisms of complexation and Cπ-coordination were trivial in both biochars, jointly contributing 7.21% for CMB and 5.05% for M-CMB to total adsorption. The findings deepen our understanding of the mechanisms governing the adsorption process, which are also important for future practical applications in the removal of heavy metals from wastewater by the biochars.

Impact of technical power take-off constraints on the power extraction of unidirectional and bidirectional point absorbers

2015 ◽  
Vol 34 (6) ◽  
pp. 1796-1806
Author(s):  
Alessandro Bozzetto ◽  
Ole Christian Spro ◽  
Elisabetta Tedeschi
Keyword(s):  
Wave Energy ◽  
Control Strategy ◽  
Energy Production ◽  
Power Performance ◽  
Content Type ◽  
Practical Applications ◽  
Power Extraction ◽  
Point Absorber ◽  
Point Absorbers ◽  
The Impact

Purpose – The purpose of this paper is to quantify the impact of the constraints of the power take-off system (PTO) on the power extraction of a point absorber wave energy converter (WEC). Such constraints include power, torque and maximum stroke limitations. Two different concepts, unidirectional and bidirectional point absorbers, are analysed, which both are relevant for practical applications in the wave energy industry. Design/methodology/approach – The two different cases of unidirectional and bidirectional point absorbers are analysed and directly compared. Moreover, a simplified control strategy is considered for the point absorber, which is based on a constant torque reference. The WEC performance is first evaluated in selected sea states and then the analysis is extended to assess the impact of the different solutions on the expected yearly wave energy production of the point absorber, when deployed at a specific location. The European Marine Energy Center (EMEC) is selected as the target site for the analysis. Findings – The analysis was performed in selected sea states and then it was extended to all the sea conditions occurring at the EMEC test site. The comparison between unidirectional and bidirectional operated devices suggested a clear superiority of the latter, ensuring similar power extraction at the expense of a halved required torque by the PTO. Moreover, a selective control strategy was implemented, and the results showed an increase in yearly energy production for the bidirectional device. Research limitations/implications – The study proved the importance of including the actual PTO constraints in the preliminary power assessment in order to avoid unrealistic overestimation of the expected power performance. Originality/value – The paper quantifies the power performance obtained with the application of such control strategy considering both unidirectional and bidirectional point absorbers. This analysis and comparison is extremely relevant since both unidirectional and bidirectional devices are reaching the market.

Dynamical Modeling and Intelligent Control of Aeration Process for Pollutants Degradation in Technics of SBR

2016 ◽  
Vol 859 ◽  
pp. 127-133
Author(s):  
Hong Jian Tao ◽  
Hu Xu
Keyword(s):  
Control Strategy ◽  
Sewage Treatment ◽  
Control Process ◽  
Degradation Process ◽  
Pollutant Degradation ◽  
Modeling And Control ◽  
Precise Control ◽  
Aeration Process ◽  
And Control ◽  
The Mathematical Model

Aimed at the puzzle of the pollutant degradation of sewage treatment in technics of SBR being difficult to implement the mathematical modeling and precise control, the paper researched on the modeling and control of the aeration process in sewage treatment. In the paper, it pointed out the technical difficulties existed in pollutant degradation control, analyzed the cybernetics characteristic in pollutant degradation process, built the mathematical model of control process based on the mechanism of biochemical reaction, proposed the control strategy matched with the cybernetics characteristic of aeration process, constructed the control algorithm based on human simulate intelligence. Taken the built process control model as an example, the simulation experiments demonstrated the feasibility and effectiveness of proposed control strategy. The research results show that the built model and proposed control strategy are feasible and applicable.

Bio-inspired control research of a novel lower extremity exoskeleton with a series-parallel mechanism

2014 ◽  
Vol 229 (16) ◽  
pp. 2875-2889 ◽  
Author(s):  
Dalei Pan ◽  
Feng Gao ◽  
Yunjie Miao ◽  
Rui Cao
Keyword(s):  
Lower Extremity ◽  
Control Strategy ◽  
Pid Controller ◽  
Parallel Mechanism ◽  
Simulation Method ◽  
Fuzzy Pid ◽  
Precise Control ◽  
Walking Gait ◽  
Level Walking ◽  
Control Research

This paper proposes a switch-type and parameter self-tuning fuzzy-PID/PID controller for a novel lower extremity exoskeleton with a series-parallel mechanism according to the features of human level walking gait. The novel exoskeleton mechanism was described, the biological characteristics of human legs during the walking cycle were analyzed and a mapping from the positions of human lower extremity joints to the exoskeleton joints was established. Then the schematic of the exoskeleton control strategy was discussed and illustrated. The co-simulation method of ADAMS and MATLAB/SIMULINK was adopted and the fuzzy-PID/PID controller was designed. A 1-DOF rotation control was simulated by both the fuzzy-PID/PID controller and a conventional PID controller for comparison. Finally, the exoskeleton level walking gait was co-simulated by using the bio-inspired control strategy. The results show that the controller can provide a fast, stable and precise control for the exoskeleton system.

Fabrication and Evaluation of Electrolyte-Supported Hollow Fiber Solid Oxide Fuel Cells

2009 ◽  
Vol 79-82 ◽  
pp. 1691-1694 ◽  
Author(s):  
Chun Li Yang ◽  
Wei Li ◽  
Shang Quan Zhang ◽  
Jian Jun Liu ◽  
Chu Sheng Chen ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Hollow Fiber ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Hydrogen Gas ◽  
High Mechanical Strength ◽  
Practical Applications ◽  
Before And After ◽  
Ysz Electrolyte ◽  
Power Densities

YSZ electrolyte-supported hollow-fiber SOFCs were successfully fabricated and their electrical and mechanical properties were investigated. The as-prepared hollow fiber SOFCs show a high mechanical strength of 149.0 MPa and 177.9 MPa before and after reduction by hydrogen gas, respectively. The open circuit voltage (OCV) values are greater than 1.0 V and the maximum power densities reach 146 mW cm-2 at 800°C, using wet H2 (～3% H2O) and static air as fuel and oxidant gas, respectively. As a result of high packing densities, this kind of YSZ electrolyte-supported hollow-fiber SOFCs has a high potential for practical applications.

scholarly journals Compatibility between C6F12O–N2 Gas Mixture and Metal Used in Medium-Voltage Switchgears

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4639
Author(s):  
Ran Zhuo ◽  
Qi Chen ◽  
Dibo Wang ◽  
Mingli Fu ◽  
Ju Tang ◽  
...  
Keyword(s):  
Gas Mixture ◽  
Copper Sheet ◽  
Surface Color ◽  
Practical Applications ◽  
Medium Voltage ◽  
Before And After ◽  
Different Temperatures ◽  
Potential Alternative ◽  
Better Than

C6F12O has been introduced as the potential alternative gas to SF6 because of its excellent insulation properties and great eco-friendly performance. Considering that C6F12O may react with the internal materials of switchgears in practical applications, its compatibility with metal materials must be tested to evaluate its long-term application possibilities. In this work, the compatibility of C6F12O–N2 gas mixtures with aluminum and copper was tested at different temperatures by setting up a heat-aging reaction platform between the gas and each metal. The metal surface morphology and gas composition before and after the reaction were compared and analyzed. The results show that the surface color of the copper sheet changed considerably, and the corrosion degree of the surface deepened with the increase of temperature. The decomposition of C6F12O was also promoted. In contrast, aluminum did not react severely with the gas mixture. The compatibility of the gas mixture with aluminum was generally better than that of copper.

Sign in / Sign up

Export Citation Format

Share Document