scholarly journals Preparation of Nickel Nanoparticles by Direct Current Arc Discharge Method and Their Catalytic Application in Hybrid Na-Air Battery

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 684 ◽  
Author(s):  
Fengmei Su ◽  
Xuechao Qiu ◽  
Feng Liang ◽  
Manabu Tanaka ◽  
Tao Qu ◽  
...  
Keyword(s):  
Direct Current ◽  
Composite Structures ◽  
High Speed ◽  
Large Scale ◽  
Nickel Nanoparticles ◽  
Arc Discharge ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Air Battery ◽  
Discharge Method

Nickel nanoparticles were prepared by the arc discharge method. Argon and argon/hydrogen mixtures were used as plasma gas; the evaporation of anode material chiefly resulted in the formation of different arc-anode attachments at different hydrogen concentrations. The concentration of hydrogen was fixed at 0, 30, and 50 vol% in argon arc, corresponding to diffuse, multiple, and constricted arc-anode attachments, respectively, which were observed by using a high-speed camera. The images of the cathode and anode jets were observed with a suitable band-pass filter. The relationship between the area change of the cathode/anode jet and the synchronous voltage/current waveform was studied. By investigating diverse arc-anode attachments, the effect of hydrogen concentration on the features of nickel nanoparticles were investigated, finding that 50 vol% H2 concentration has high productivity, fine crystallinity, and appropriate size distribution. The synthesized nickel nanoparticles were then used as catalysts in a hybrid sodium–air battery. Compared with commercial a silver nanoparticle catalyst and carbon black, nickel nanoparticles have better electrocatalytic performance. The promising electrocatalytic activity of nickel nanoparticles can be ascribed to their good crystallinity, effective activation sites, and Ni/NiO composite structures. Nickel nanoparticles prepared by the direct current (DC) arc discharge method have the potential to be applied as catalysts on a large scale.

Synthesis and electrochemical properties of silicon nanosheets by DC arc discharge for lithium-ion batteries

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6860-6865 ◽  
Author(s):  
Xiuhong Yu ◽  
Fanghong Xue ◽  
Hao Huang ◽  
Chunjing Liu ◽  
Jieyi Yu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Large Scale ◽  
Arc Discharge ◽  
Lithium Ion ◽  
Dc Arc ◽  
Discharge Method

We synthesized 2D Si nanostructure with thickness less than 8 atomic layers at large scale by DC arc discharge method.

scholarly journals MANUFACTURING AND QUALITY ASSURANCE OF LIGHTWEIGHT PARTS IN MASS PRODUCTION

2018 ◽  
Vol 18 (3) ◽  
pp. 42-56
Author(s):  
Lothar KROLL ◽  
Adam CZECH ◽  
Rainer WALLASCH
Keyword(s):  
Mass Production ◽  
Composite Structures ◽  
High Speed ◽  
Large Scale ◽  
Fiber Composite ◽  
Thermoplastic Composites ◽  
Materials Testing ◽  
Scale Production ◽  
Damage Development ◽  
And Function

Production-related preliminary damage and residual stresses have significant effects on the functions and the damage development in fiber composite components. For this reason, it is important, especially for the safety-relevant components, to check each item. This task becomes a challenge in the context of serial production, with its growing importance in the field of lightweight components. The demand for continuous-reinforced thermoplastic composites increases in various industrial areas. According to this, an innovative Continuous Orbital Winding (COW) process was carried out within the framework of the Federal Cluster of Excellence EXC 1075 “MERGE Technologies for Multifunctional Lightweight Structures”. COW is aiming for mass-production-suited processing of special semi-finished fiber reinforced thermoplastic materials. This resource-efficient and function-integrated manufacturing process contains a combination of thermoplastic tape-winding with automated thermoplastic tape-laying technology. The process has a modular concept, which allows implementing other special applications and technologies, e.g. integration of different sensor types and high-speed automated quality inspection. The results show how to control quality and improve the stability of the COW process for large-scale production. This was realized by developing concepts of a fully integrated quality-testing unit for automatic damage assessment of composite structures. For this purpose, the components produced in the COW method have been examined for imperfections. This was performed based on obtained results of non-destructive or destructive materials testing.

Aerosol synthesis of titanium nitride nanoparticles by direct current arc discharge method

2020 ◽  
Vol 31 (9) ◽  
pp. 4119-4128
Author(s):  
Qingqing Fu ◽  
David Kokalj ◽  
Dominic Stangier ◽  
Frank Einar Kruis ◽  
Wolfgang Tillmann
Keyword(s):  
Titanium Nitride ◽  
Direct Current ◽  
Arc Discharge ◽  
Aerosol Synthesis ◽  
Discharge Method

scholarly journals Efficient and large-scale synthesis of few-layered graphene using an arc-discharge method and conductivity studies of the resulting films

Nano Research ◽  
2010 ◽  
Vol 3 (9) ◽  
pp. 661-669 ◽  
Author(s):  
Yingpeng Wu ◽  
Bin Wang ◽  
Yanfeng Ma ◽  
Yi Huang ◽  
Na Li ◽  
...  
Keyword(s):  
Large Scale ◽  
Arc Discharge ◽  
Large Scale Synthesis ◽  
Discharge Method

scholarly journals North Atlantic midwinter storm track suppression and the European weather response in ERA5 reanalysis

2021 ◽  
Author(s):  
Estefania Montoya Duque ◽  
Frank Lunkeit ◽  
Richard Blender
Keyword(s):  
North Atlantic ◽  
Large Scale ◽  
Storm Track ◽  
Reanalysis Data ◽  
Band Pass Filter ◽  
Pass Filter ◽  
The North ◽  
Temperature And Precipitation ◽  
Precipitation Increase ◽  
Precipitation Anomalies

AbstractIn this study, we analyse the influence of North Atlantic midwinter storm track suppressions on European synoptic temperature and precipitation anomalies to determine the large-scale conditions relevant for the so-called Christmas thaw. We diagnose this relation in daily ERA5 reanalysis data in the spatial resolution of 0.25∘ between 1979 and 2018. To access synoptic time scales, a 3–10-day band-pass filter is applied. An index for the suppression is defined by the upper tropospheric Eddy Kinetic Energy (EKE) anomalies in the North Atlantic. We define the strong jet stream years as the year exceeding the 75% of the winter seasonal values at 250 hPa. In winters with strong jet activity, the storm track suppression is found, in agreement with the barotropic governor mechanism. Composites of European surface temperature and precipitation for low index values reveal weakly warmer conditions during winter (DJF) in Central Europe and the British Isles and a distinct cooling in Northern Europe. In the 1-month interval during December 15 to January 15, the warming is more pronounced. The clearest signal is the precipitation increase with a magnitude of 1 mm/day in the Mediterranean region.

Ignition Performance of Direct Arc Discharge Method in High Speed Airflows.

2001 ◽  
Vol 49 (573) ◽  
pp. 334-339 ◽  
Author(s):  
Kiyotaka SHUZENJI ◽  
Ryoichi KATO ◽  
Takeshi TACHIBANA
Keyword(s):  
High Speed ◽  
Arc Discharge ◽  
Discharge Method

Efficient Co@CoPx core–shell nanochains catalyst for the oxygen evolution reaction

2018 ◽  
Vol 5 (8) ◽  
pp. 1844-1848 ◽  
Author(s):  
Xiaotao Yuan ◽  
Zhe Zhang ◽  
Zichao Liu ◽  
Xin Wang ◽  
Chenlong Dong ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Direct Current ◽  
Oxygen Evolution Reaction ◽  
Arc Discharge ◽  
Core Shell ◽  
Discharge Method

Co@CoPx core–shell nanochains were prepared via a direct-current arc-discharge method and subsequent phosphorization at 350 °C.

The Transceiver Circuit Design of Digital Ultrasonic System

2013 ◽  
Vol 834-836 ◽  
pp. 968-973
Author(s):  
Xiao Feng Zhang ◽  
Fo Chang Xie ◽  
Guo Wei Yang ◽  
Wei Zhang
Keyword(s):  
Circuit Design ◽  
High Voltage ◽  
High Speed ◽  
Power Input ◽  
High Gain ◽  
Low Noise ◽  
Band Pass Filter ◽  
Echo Signal ◽  
Pass Filter ◽  
Input Use

This paper introduces the design process of the digital ultrasonic transmission circuit: echo receiving circuit and the echo signal regulate circuit. Among them, outside 500 V DC - DC module for high voltage power input, use non-tuned type circuit design ultrasonic transmission circuit ; Select high voltage fast recovery diode FR107 design echo receiving limiter circuit; Using ultra-high speed, low noise, low distortion of the integrated operational amplifier MAX4104ESA design preamplifier circuits and the band-pass filter circuits; Using linear decibels, low noise, wide bandwidth, high gain accuracy amplifier AD603 design echo amplifying circuit. The experimental results indicate that the basic realization of the ultrasonic transceiver circuit and echo signal conditioning functions.

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