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GMAW is a complete arc welding process. It is equipped to create all types of joints of desirable quality involving virtually all metals of any thickness in any position. However, in doing so there are parametric shifts in arc gap or load characteristics. Change in materials such as shielding gas, weld metal and work piece etc. influence the operating point of the process. Moreover, the controller...
The main objective of this work was to examine the feasibility of biohydrogen production using ammonium solution resulting from nitrate electrochemical reduction. In this coupled process a concentrated nitrate solution of 3g NO3L−1 was firstly converted to ammonium using a home-made electrochemical flow cell, leading to 97% ammonium selectivity. This solution was then used as a nitrogen source to...
500 kHz optical beam scanning with a full scan angle of over 100 mrad is demonstrated using a potassium tantalite niobate (KTa1−xNbxO3, KTN) deflector. To suppress any heating of the KTN chips during the high frequency operation and to have a sufficient interaction length to achieve more than 100 mrad deflection, the deflector consists of two KTN chips each of which has a pentagon-shaped electrode...
This paper reports an original way for dielectric characterizations under high electric field and high temperature based on the coupling between electric current measurements and real-time fast infrared (IR) thermography. Particularly, the Joule heating phenomena were quantified by 2D-temperature cartography in a polyimide (PI) film exposed to an initial temperature of 300 °C through IR observations...
The issues of the development of adaptive pulsearc welding methods for construction and repair of the main pipelines are considered in this work. Welding methods are developed on the basis of examination of melting kinetics and transfer of some electrode metal. These methods allow ensuring a defect-free formation of root, filling and facing seams of welding combination in different space positions.
Monitoring of radiofrequency ablation (RFA) is essential to ensure accurate treatment coverage of large liver tumors. Ultrasound is an excellent option for monitoring of ablations. Since ultrasound B-mode imaging lacks the ability to precisely estimate the extent of the lesion, there has been considerable effort and interest in other ultrasound based monitoring techniques. Ultrasound thermometry is...
A digital microfluidic biochip (DMFB) is an attractive technology platform for revolutionizing immunoassays, clinical diagnostics, drug discovery, DNA sequencing, and other laboratory procedures in biochemistry. In most of these applications, real-time polymerase chain reaction (PCR) is an indispensable step for amplifying specific DNA segments. Compared with traditional PCR platforms, DMFBs offer...
Alterations in cortical causality information flow induced by remifentanil infusion in healthy volunteers was investigated in a placebo-controlled double-blind cross-over study. For each of the 21 enrolled male subjects, 2.5 minutes of resting electroencephalography (EEG) data were collected before and after infusion of remifentanil and placebo. Additionally, to assess cognitive function and analgesic...
A plurality of whole cell biosensors have been developed using many different cell types. Biosensors incorporate biomolecular components or whole cells to facilitate specific analyte interaction; research documented here presents a novel whole cell biosensor based on the slime mould Physarum polycephalum (PP). The electrical response of PP when exposed to multiple chemicals are measured and quantified...
The current density distribution in a lithium-ion battery was studied by a modeling method using the finite element method. The potential and current density distributions in the lithium-ion battery were obtained through solving the equations of the modeling. Then the distribution of the temperature of the lithium-ion battery were calculated based on the conclusion of the modeling. The temperature...
We propose a method to calculate the output current-voltage characteristics of a light induced thermionic emission device. This approach improves on the existing methods by having both a higher precision and higher range in evaluating the associated integrals, resulting in simulated device characteristics with a wider range of parameters. This method represents a significant step towards the characterization...
Different micro-heaters structures are analyzed and experimentally demonstrated to optimize the thermo-optic tuning performance of silicon MMIs. A 28dB crosstalk with 65 mW power consumption has been achieved for a double meander structure.
A multi-physics model is developed based on P2D model, including the electrochemical part, thermal part and the temperature distribution. It can simulate the physical and chemical phenomena from the scale of the active particles to the scale of whole battery. The charging optimization is also investigated, two internal characteristics, which can only be calculated by the proposed model, are treated...
Lifetime of most vacuum and gas-discharge switching devices is determined primarily by electroerosion resistance of electrodes manufactured from refractory materials — molybdenum, tungsten, etc. Low thermal conductivity and electrical conductivity of these materials contribute to an undesirable increase of temperature of the electrodes surface. In this paper the calculation results of characteristics...
Continuous arc discharge system is characterised to be implemented into the applications of fused fiber components as an alternative heat sources such as the chemical flame, filament fusion and laser. The heat source generated by the continuous arc discharge system which is a result of electron flows across two points which heats up the surrounding air in the gap. Heat is transferred to the fiber...
Resistance Spot Welding (RSW) is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current. Inconsistent welds and insufficient nugget size are some of the problems in RSW. As a remedy to these problems a novel RSW control approach is proposed in this paper. The RSW control design is based on a thermal dynamical model. The controllers proposed...
To develop an electrode configuration without a semiconducting electrode for space charge measurements, a hemispherical steel electrode with a rough surface was used as the upper electrode in the pulsed electroacoustic (PEA) method to obtain acoustic matching with the sample. The space charge distributions of a polymer film were measured using various electrode configurations. As a semiconducting...
Parylene (poly-p-xylene) is a famous heat-resisting polymer and its melting point is ∼400°C. Especially Parylene is often used as a flexible sheet and encapsulation film of organic transistors and light-emitting diodes. However, Parylen has an interesting electrical behavior, the same negative temperature dependence of current as metals. In this report, the electronic states (HOMO and LUMO) of Parylene...
With the expanding of the pulse application, high repetition pulse power technology has become an essential topic. Research to explore the application of self-healing capacitors to repetitive pulse power systems is of great importance. This paper focus on high energy density capacitors applied in repetitive pulse applications less than 100 Hz. Firstly, a heat transfer model based on the finite element...
This paper describes bacterial decontamination of liquid foods using intense pulsed electric fields (PEF) combined with a moderate thermal treatment (<55°C), where most of ingredients remain unchanged. We have developed a oneway flow treatment system including a water-cooled parallel plane electrode and heat exchangers to control the liquid temperature. A 600 ns-long mono-polar rectangular pulse...
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