Formation of Cu layer on Al nanoparticles during thermite reaction in Al/CuO nanoparticle composites: Investigation of off-stoichiometry ratio of Al and CuO nanoparticles for maximum pressure change

2015 ◽  
Vol 162 (10) ◽  
pp. 3823-3828 ◽  
Author(s):  
Kyuhyeon Lee ◽  
Dahin Kim ◽  
Jaewon Shim ◽  
Sangbum Bae ◽  
Do Joong Shin ◽  
...  
Keyword(s):  
Pressure Change ◽  
Cuo Nanoparticles ◽  
Maximum Pressure ◽  
Thermite Reaction ◽  
Al Nanoparticles ◽  
Nanoparticle Composites ◽  
Cuo Nanoparticle

Simulation Analysis and Optimization of Lubricating Oil System

2021 ◽  
Author(s):  
Qiongxiao Wu ◽  
Jianjun Wang ◽  
Jingming Chen ◽  
Pengzheng Li
Keyword(s):  
Simulation Model ◽  
Simulation Analysis ◽  
Sudden Change ◽  
Pressure Change ◽  
Lubricating Oil ◽  
Maximum Pressure ◽  
Closing Time ◽  
Original Design ◽  
Relief Valve ◽  
Simulation Results

Abstract Based on the one-dimensional simulation model of lubricating oil system is established and analyzed by using FLOWMASTER software, this paper proposes a new method of optimizing lubricating oil system by PID technology. Ensure that the configuration requirements and control strategies of the relevant accessories of the simulation model are satisfied with the design requirements. Firstly, by simulating lubricating oil pressure fluctuation and lubricating oil flow distribution under Open/Close Valve in different opening and closing time, the optimal opening/closing time of Open/Close Valve is determined to be 0.2 s and 0.5 s respectively. Secondly, by writing the controller script file combined with a controller to realize automatic unloading relief valve simulation, determine the relief valve pressure regulating range of 0∼0.38 MPa, For precision of constant pressure valve of oil spill, the simulation results show that the average 10 m3/h flow caused by pressure changes of about 0.06 MPa. Under the flow sudden change signal of about 40 m3/h, the maximum pressure change is less than 0.1 MPa. Through the simulation results, it is found that most of the lubrication parts in the original design have the phenomenon of flow redundancy, which causes unnecessary pump power loss. The system is optimized by PID technology. By comparing the simulation results before and after optimization, it is found that the speed of constant displacement pump could be changed in time by PID controller, and the flow redundancy could be improved significantly, so the lubricating oil system could be lower consumption and achieve the purpose of optimization.

862Syncav with multipoint pacing improves acute left ventricular hemodynamics

EP Europace ◽  
2020 ◽  
Vol 22 (Supplement_1) ◽  
Author(s):  
A Chow ◽  
P Waddingham ◽  
T Betts ◽  
J Mangual ◽  
N Badie ◽  
...  
Keyword(s):  
Biventricular Pacing ◽  
Pressure Change ◽  
Left Ventricular ◽  
Maximum Pressure ◽  
Conduction Time ◽  
Multipoint Pacing ◽  
Surface Ecg ◽  
Intrinsic Conduction ◽  
Qrs Duration ◽  
Incremental Improvement

Abstract Funding Acknowledgements Abbott Introduction SyncAV has been shown to improve electrical synchronization by automatically adjusting atrioventricular delay (AVD) according to the intrinsic atrioventricular conduction time. Additional incremental electrical synchronization may be gained by the addition of second left ventricular (LV) pulse with MultiPoint Pacing (MPP). While the electrical synchronization benefits of SyncAV have been previously explored, there has been no assessment of the acute hemodynamic impact of SyncAV with or without MPP. Objective  Evaluate the acute LV hemodynamic impact of SyncAV with and without MPP. Methods Heart failure patients with LBBB and QRS duration (QRSd) > 140 ms undergoing CRT-P/D implant with a quadripolar LV lead were enrolled in this prospective study. A guidewire or catheter with pressure transducer was placed in the LV chamber and the maximum pressure change (dP/dtmax) was recorded during the following pacing modes:  intrinsic conduction, conventional biventricular pacing with SyncAV (BiV + SyncAV), and MPP with SyncAV (MPP + SyncAV). Twelve-lead surface ECG was used to determine the patient-tailored SyncAV offset that minimized QRSd. Results Twenty-seven patients (67% male, 44% ischemic, 30 ± 7% ejection fraction) completed the acute recordings. Relative to the intrinsic QRSd of 163 ms, BiV + SyncAV reduced QRSd by 21.5% to 124 ms (p < 0.001 vs. intrinsic) and MPP + SyncAV reduced QRSd by 26.6% to 120 ms (p < 0.05 vs. BiV + SyncAV). Beyond electrical synchronization, SyncAV significantly improved acute hemodynamics. Relative to the intrinsic dP/dtmax of 842 mmHg/s, BiV + SyncAV elevated dP/dtmax by 6.3% to 900 mmHg/s (p < 0.001 vs. intrinsic) and MPP + SyncAV elevated dP/dtmax by 8.8% to 926 mmHg/s (p < 0.005 vs. BiV + SyncAV). Despite both QRSd and dP/dtmax improvement with SyncAV and MPP, correlation between electrical and hemodynamic measurements was poor (R2 = 0.0 for BiV + SyncAV, R2 = 0.1 for MPP + SyncAV). Conclusion SyncAV may significantly improve acute LV hemodynamics in addition to electrical synchrony in LBBB patients. Further incremental improvement was achieved by combining SyncAV with MPP. Abstract Figure.

Computational Simulation of Synovial Fluid Kinematics of the Scapholunate Joint

2019 ◽  
Vol 24 (02) ◽  
pp. 169-174
Author(s):  
Yoke-Rung Wong ◽  
Sophie Sok Huei Tay ◽  
Ita Suzana Mat Jais ◽  
Hwa-Liang Leo ◽  
Chee-Fui Lieu ◽  
...  
Keyword(s):  
Synovial Fluid ◽  
Fluid Model ◽  
Computational Simulation ◽  
Fluid Pressure ◽  
Pressure Change ◽  
Carpal Bones ◽  
Ligament Injury ◽  
Maximum Pressure ◽  
Fluid Interface ◽  
Volume Method

Background: The interaction between wrist kinematics and synovial fluid pressure has yet to be studied. To our knowledge, this is the first study to determine the effect of scapholunate joint kinematics on synovial fluid pressure change using finite volume method. Methods: The carpal bones of a cadaveric hand were obtained from Computed Tomography (CT) scans. CT images of the carpal bones were segmented and reconstructed into 3D model. The 3D synovial fluid model between the scaphoid and lunate was constructed and then used for computational simulations. The kinematics data of scapholunate joint obtained from radioulnar deviation of the wrist was investigated. Results: It was found that the pressure in synovial fluid varied from -1.68 to 2.64 Pa with maximum pressure located at the scaphoid-fluid interface during the radial deviation. For ulnar deviation, the pressure increased gradually from the scaphoid-fluid interface towards the lunate-fluid interface (-1.37 to 0.37 Pa). Conclusions: This new computational model provides a basis for the study of pathomechanics of ligament injury with the inclusion of synovial fluid.

Soil-derived fulvic acid and root exudates, modified by soil bacteria, alter CuO nanoparticle-induced root stunting of wheat via Cu complexation

2019 ◽  
Vol 6 (12) ◽  
pp. 3638-3652 ◽  
Author(s):  
J. M. Hortin ◽  
A. J. Anderson ◽  
D. W. Britt ◽  
A. R. Jacobson ◽  
J. E. McLean
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Fulvic Acid ◽  
Root Exudates ◽  
Soil Bacteria ◽  
Cuo Nanoparticles ◽  
Cuo Nanoparticle ◽  
Soluble Complexes

Cu from CuO nanoparticles is bioavailable to wheat as soluble complexes of root/bacterial exudates and soil organic matter.

Electrospun Nanofibers Embedded with Copper Oxide Nanoparticles to Improve Antiviral Function

2021 ◽  
Vol 21 (8) ◽  
pp. 4174-4178
Author(s):  
Wen Ying Cui ◽  
Hyun Jin Yoo ◽  
Yun Guang Li ◽  
Changyoon Baek ◽  
Junhong Min
Keyword(s):  
Electron Microscopy ◽  
Copper Oxide ◽  
Oxygen Plasma ◽  
H1n1 Virus ◽  
Polymer Surface ◽  
Electrospun Nanofibers ◽  
Cuo Nanoparticles ◽  
Epidemic Spread ◽  
Antiviral Efficacy ◽  
Cuo Nanoparticle

Many studies on anti-bacterial/antiviral surfaces have been conducted to prevent epidemic spread worldwide. Several nanoparticles such as those composed of silver and copper are known to have antiviral properties. In this study, we developed copper oxide (CuO) nanoparticle-incorporated nanofibers to inactivate or remove viruses. The CuO nanoparticle-incorporated nanofiber was fabricated with a hydrophobic polymer—polyvinylpyrrolidone (PVP)—using electrospinning, and CuO nanoparticles were exposed from the PVP polymer surface by etching the nanofiber with oxygen plasma. The fabrication conditions of electrospinning and oxygen plasma etching were investigated by scanning electron microscopy (SEM), and field emission transmission electron microscopy (FETEM)/ energy dispersive spectrometry (EDS). H1N1 virus was utilized as the target sample and quantified by RT-qPCR. The antiviral efficacy of CuO nanoparticle-incorporated nanofibers was compared against bare CuO nanoparticles. Overall, 70% of the viruses were inactivated after CuO nanoparticle-incorporated nanofibers were incubated with 102 pfu/mL of H1N1 virus solution for 4 h. This indicates that the developed CuO nanoparticle-incorporated nanofibers have noticeable antiviral efficacy. As the developed CuO nanoparticle-incorporated nanofibers exerted promising antiviral effects against H1N1 virus, it is expected to benefit global health by preventing epidemic spread.

scholarly journals Environmental exposure of a simulated pond ecosystem to a CuO nanoparticle-based wood stain throughout its life cycle

2018 ◽  
Vol 5 (11) ◽  
pp. 2579-2589 ◽  
Author(s):  
Mélanie Auffan ◽  
Wei Liu ◽  
Lenka Brousset ◽  
Lorette Scifo ◽  
Anne Pariat ◽  
...  
Keyword(s):  
Life Cycle ◽  
Environmental Exposure ◽  
Cuo Nanoparticles ◽  
Pond Ecosystem ◽  
Aquatic Mesocosms ◽  
Cuo Nanoparticle

Indoor aquatic mesocosms were used to assess the behavior of a wood stain containing CuO nanoparticles in a simulated pond ecosystem for 1 month.

scholarly journals In situ synthesis of CuO nanoparticles over functionalized mesoporous silica and their application in catalytic syntheses of symmetrical diselenides

2019 ◽  
Vol 48 (48) ◽  
pp. 17874-17886 ◽  
Author(s):  
Trisha Das ◽  
Rana Chatterjee ◽  
Adinath Majee ◽  
Hiroshi Uyama ◽  
David Morgan ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
In Situ Synthesis ◽  
Cuo Nanoparticles ◽  
Functionalized Mesoporous Silica ◽  
Cuo Nanoparticle ◽  
Nanoparticle Catalyst

A versatile and novel mesoporous silica supported CuO nanoparticle catalyst (nCuO-FMS) and its application in the syntheses of symmetrical diselenides.

scholarly journals A facile approach towards copper oxide nanoparticles synthesis using Spirulina platensis and assessment of its biological activities

2018 ◽  
Vol 5 (10) ◽  
pp. 433-442 ◽  
Author(s):  
Priyanga Jayakrishnan ◽  
Sirajunnisa Abdul Razack ◽  
Keerthana Sivanesan ◽  
Pavithra Sellaperumal ◽  
Geethalakshmi Ramakrishnan ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Spirulina Platensis ◽  
Biological Activities ◽  
Nanoparticle Synthesis ◽  
Cuo Nanoparticles ◽  
Metal Nanoparticle ◽  
Anticancer Activities ◽  
Cytotoxicity Activity ◽  
Ft Ir ◽  
Cuo Nanoparticle

There is a budding need to develop a method for environmentally benign metal nanoparticle synthesis, that do not use toxic chemicals in the synthesis protocols to avoid adverse effects in medical applications. The present investigation dealt with the synthesis of copper oxide (CuO) nanoparticles from blue green alga, Spirulina platensis. The algal extract consisting of phytochemicals was used as the reducing agent and copper sulphate as the substrate. Synthesised nanoparticles were characterized by UV-Vis spectrophotometry, FT-IR spectroscopy, XRD and SEM. Antibacterial and anticancer activities were assessed for the CuO nanoparticles. The results indicated that the formed CuO nanoparticles were observed to be nanosheets. FT-IR spectral analysis elucidated the occurrence of biomolecules required for the reduction of copper oxide ions. The synthesized nanoparticles were found to be effective at the concentration of 1 mg/mL against Escherichia coli, Bacillus subtilis, Pseudomonas aeruginosa and Serratia marcescens. The cytotoxicity activity of CuO nanoparticle was evaluated by MTT Assay against colon cancer cell lines and confirmed that CuO nanoparticle at a concentration of 125 µg/mL had cytotoxic activity. In conclusion, the CuO nanoparticles were synthesized at a low energy supply, in an ecologically safe mode which could be utilized for pharmacological applications and various biotechnological studies.

scholarly journals Towards a shock tube method for the dynamic calibration of pressure sensors

2014 ◽  
Vol 372 (2023) ◽  
pp. 20130299 ◽  
Author(s):  
Stephen Downes ◽  
Andy Knott ◽  
Ian Robinson
Keyword(s):  
Shock Tube ◽  
Low Cost ◽  
Pressure Sensors ◽  
Pressure Change ◽  
Maximum Pressure ◽  
Shock Tubes ◽  
Pressure Transducers ◽  
Pressure Step ◽  
Pressure Tubing ◽  
Fast Rise

In theory, shock tubes provide a pressure change with a very fast rise time and calculable amplitude. This pressure step could provide the basis for the calibration of pressure transducers used in highly dynamic applications. However, conventional metal shock tubes can be expensive, unwieldy and difficult to modify. We describe the development of a 1.4 MPa (maximum pressure) shock tube made from unplasticized polyvinyl chloride pressure tubing which provides a low-cost, light and easily modifiable basis for establishing a method for determining the dynamic characteristics of pressure sensors.

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