Fabrication of two-phase Ca2+-doped LaVO4:Eu3+ structures: morphology modification, tunable optical performance and detection of Fe3+ ions with high sensitivity

2021 ◽  
Author(s):  
Lingwei Zeng ◽  
Zhongyu Li ◽  
Hu Zhou ◽  
jianxian zeng ◽  
zhengqiu yuan ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
High Sensitivity ◽  
Optical Performance ◽  
Two Phase ◽  
Morphology Modification

The two-phase Ca2+-doped LaVO4:Eu3+ nanocrystals are prepared through a hydrothermal method with the help of SOD CITR and EDTA surfactants. The phase and morphology of the products are characterized by...

Moisture Fraction Measurements for Two-Phase Mist Flow Using High-Sensitivity Capacitance Sensors

1997 ◽  
Vol 117 (3) ◽  
pp. 353-365 ◽  
Author(s):  
Michael F. Dowling ◽  
Jason D. Wartell ◽  
Sheldon M. Jeter ◽  
Said I. Abdel-Khalik
Keyword(s):  
High Sensitivity ◽  
Two Phase ◽  
Mist Flow

Study on Velocity Measurement of Gas/Solid Flow Based on Electrostatic Sensor

2014 ◽  
Vol 614 ◽  
pp. 275-278
Author(s):  
Yu Tang ◽  
Xiang Deng ◽  
Shuo Tian
Keyword(s):  
Measurement System ◽  
Velocity Measurement ◽  
Flow Measurement ◽  
Cross Correlation ◽  
Low Cost ◽  
High Sensitivity ◽  
Two Phase ◽  
Solid Flow ◽  
Correlation Algorithm ◽  
Electrostatic Induction

Electrostatic sensor is based on the principle of electrostatic induction. It is widely used for gas/solid two-phase flow measurement because it has the advantages of simple structure, high sensitivity, low cost, etc. In this paper, a velocity measurement system of gas/solid flow based on electrostatic sensor and cross-correlation algorithm is discussed. Electrostatic sensor with circular electrode is adopted. By COMSOL optimum simulation, the axial length of the electrode is designed. The signal conditioning circuits are discussed and cross-correlation algorithm is analyzed. The initial experimental results demonstrate that the velocity measurement system of gas/solid flow designed in this paper is feasible.

A New Method of Fault Phase Identification for High Voltage Transmission Lines Based on the Fault Component of Phase Voltage

2013 ◽  
Vol 732-733 ◽  
pp. 1056-1064
Author(s):  
Yang Chen ◽  
Yan Hu ◽  
Neng Ling Tai
Keyword(s):  
Kalman Filter ◽  
High Voltage ◽  
Transmission Lines ◽  
High Sensitivity ◽  
New Method ◽  
Phase Identification ◽  
Phase Voltage ◽  
Two Phase ◽  
Kalman Filter Algorithm ◽  
High Voltage Transmission

Since the existing fault phase identification methods can not identify all fault types quickly and accurately for high voltage transmission lines, this article proposed a new method of fault phase identification based on the fault component of phase voltage difference and the kalman filter algorithm. The method defined the fault components ratio of one phase voltage to the difference of the other two phase voltages as a fault phase identification factor. By analyzing the characteristics of fault phase identification factors in each fault type, the fault phase can be identified. Simulation results show that using the kalman filter algorithm to extract fundamental component is faster and more accurate. Meanwhile, the method can identify fault phases within half a cycle and is scarcely influenced by fault resistances, fault locations and fault initial phase angles. It also has a high sensitivity when the fault is on the side of strong source.

scholarly journals Two-phase microfluidics in electrowetting displays and its effect on optical performance

2016 ◽  
Vol 10 (1) ◽  
pp. 011908 ◽  
Author(s):  
Tao He ◽  
Mingliang Jin ◽  
Jan C. T. Eijkel ◽  
Guofu Zhou ◽  
Lingling Shui
Keyword(s):  
Optical Performance ◽  
Two Phase

Heterojunction Structure ZnO/TiO2 Nanorods with Enhanced Photoelectrochemical Properties

2017 ◽  
Vol 726 ◽  
pp. 333-337 ◽  
Author(s):  
Wen Jian Feng ◽  
Liang You Lin ◽  
Hai Jin Li ◽  
Ying Peng Gong ◽  
Bo Chi
Keyword(s):  
Hydrothermal Method ◽  
Absorption Spectra ◽  
Tin Oxide ◽  
Zno Nanoparticles ◽  
Photoelectrochemical Properties ◽  
Optical Performance ◽  
Photoelectrochemical Performance ◽  
Heterojunction Structure ◽  
Step Procedure ◽  
Xrd Patterns

This paper describes a simple two-step hydrothermal method for the design of heterojunction structure combined with TiO2 nanorods coated with ZnO nanoparticles. TiO2 nanorods on F-doped tin oxide (FTO) conducting glass are synthesized by hydrothermal method and ZnO coating is prepared through a two-step procedure. The XRD patterns confirm that the nanostructure consists of rutile TiO2 and wurtzite ZnO without any other impure phase. The FE-SEM results show that ZnO is uniformly distributing on the surface of TiO2 nanorods, forming a well-connecting heterojunction. PL studies and UV-vis absorption spectra present the enhanced optical performance of ZnO/TiO2 heterojunction. The heterojunction structure ZnO/TiO2 nanorods show excellent photoelectrochemical performance. The performance and the preparation parameters are also optimized accordingly.

scholarly journals The Development of a Low-Cost Microfluidic Magnetic Separation System

2021 ◽  
Author(s):  
◽  
Geoffrey Smith
Keyword(s):  
Magnetic Particles ◽  
Permanent Magnets ◽  
Low Cost ◽  
High Sensitivity ◽  
Soft Magnetic Materials ◽  
Microfluidic Channels ◽  
Separation System ◽  
Microfluidic Systems ◽  
Two Phase ◽  
Magnetic Microbeads

<p>Microfluidic systems show excellent promise for analytical applications, due to their ability to rapidly process minute sample quantities with high sensitivity. At the same time, functionalised superparamagnetic magnetic microbeads and nanoparticles have emerged as useful substrates for biomedical applications such as bioassays, fuelling research into tools for the manipulation of magnetic particles in microfluidic channels. This thesis describes the design, fabrication and evaluation of microfluidic systems for the separation of magnetic microbeads and nanoparticles. Microfluidic devices were produced in polydimethylsiloxane using a low-cost rapid prototyping process. Channels 300μm or greater in width were accurately reproduced using this method. Laminar flow was observed in the channels of these devices, allowing two-phase flow to be used for separation purposes. Magnetic field gradients of 25-500 T/m were generated in the microchannels using either permanent magnets or soft magnetic materials. The performance of a permanent magnet-based separation system was evaluated, and it was found that the system could extract magnetic microbeads with an efficiency of up to 75%. A limited ability to separate magnetic microbeads on the basis of magnetic moment and/or particle size was also demonstrated.</p>

scholarly journals The Development of a Low-Cost Microfluidic Magnetic Separation System

2021 ◽  
Author(s):  
◽  
Geoffrey Smith
Keyword(s):  
Magnetic Particles ◽  
Permanent Magnets ◽  
Low Cost ◽  
High Sensitivity ◽  
Soft Magnetic Materials ◽  
Microfluidic Channels ◽  
Separation System ◽  
Microfluidic Systems ◽  
Two Phase ◽  
Magnetic Microbeads

<p>Microfluidic systems show excellent promise for analytical applications, due to their ability to rapidly process minute sample quantities with high sensitivity. At the same time, functionalised superparamagnetic magnetic microbeads and nanoparticles have emerged as useful substrates for biomedical applications such as bioassays, fuelling research into tools for the manipulation of magnetic particles in microfluidic channels. This thesis describes the design, fabrication and evaluation of microfluidic systems for the separation of magnetic microbeads and nanoparticles. Microfluidic devices were produced in polydimethylsiloxane using a low-cost rapid prototyping process. Channels 300μm or greater in width were accurately reproduced using this method. Laminar flow was observed in the channels of these devices, allowing two-phase flow to be used for separation purposes. Magnetic field gradients of 25-500 T/m were generated in the microchannels using either permanent magnets or soft magnetic materials. The performance of a permanent magnet-based separation system was evaluated, and it was found that the system could extract magnetic microbeads with an efficiency of up to 75%. A limited ability to separate magnetic microbeads on the basis of magnetic moment and/or particle size was also demonstrated.</p>

Proposal for Neutron Scattering Systems for Calibration of Dark Matter Search and Low-Energy Neutrino Detectors

2013 ◽  
Vol 8 (3) ◽  
pp. 27-38
Author(s):  
Aleksandr Bondar ◽  
Alexey Buzulutskov ◽  
Aleksandr Burdakov ◽  
Evgeny Grishnyaev ◽  
Aleksandr Dolgov ◽  
...  
Keyword(s):  
Dark Matter ◽  
Neutron Scattering ◽  
High Sensitivity ◽  
Low Energy ◽  
Proton Accelerator ◽  
Two Phase ◽  
Dark Matter Search ◽  
Energy Neutrino ◽  
Wide Range ◽  
Scattering Systems

The proposal of two neutron scattering systems for calibration of two-phase cryogenic avalanche detectors with high sensitivity being developed at Budker INP is presented. This kind of detectors is designed for the search of dark matter and low energy neutrino detection, in particular, coherent neutrino scattering on nuclei. Detector calibration is made with a measurement of ionization yield and scintillation quenching factor for low energy recoiling nuclei (in 0.5 to 100 keV range) originating from elastic scattering of neutrons. To provide wide range of recoiling nuclei energies two systems of neutron scattering are proposed. The first one is based on small-sized DD generator of fast (2.45 MeV) monoenergetic neutrons operating on sealed neutron tube. The second one is based on tandem proton accelerator and lithium target and capable of generation of monoenergetic epithermal neutrons with energy up to 100 keV

Deformation Mechanism of Two-Phase Solder Column Interconnections Under Highly Accelerated Thermal Cycling Condition: An Experimental Study

1997 ◽  
Vol 119 (3) ◽  
pp. 189-196 ◽  
Author(s):  
B. Han
Keyword(s):  
Thermal Cycling ◽  
Deformation Mechanism ◽  
High Sensitivity ◽  
Specimen Preparation ◽  
Thermal Cycles ◽  
Displacement Fields ◽  
Two Phase ◽  
Accelerated Thermal Cycling ◽  
Inelastic Strains

Thermomechanical behavior of solder interconnections of a ceramic column grid array package assembly is characterized by high sensitivity moire´ interferometry. The in situ thermal deformations of the most distant column from the axis-of-symmetry are documented for (a) an initial isothermal loading of ΔT = −60° and (2) subsequent accelerated thermal cycles of (20°C)−(125°C)−(−40°C)−(20°C). The deformed shape of the column obtained from the displacement fields clearly delineates the effect of the eutectic solder fillet on the column deformation accumulated during accelerated thermal cycling. A deformation mechanism is suggested to explain the results, which is confirmed by the results from the actual accelerated thermal cycle test of the same assembly. The distributions of inelastic strains accumulated during thermal cycles are determined along the sides of the column. The results emphasize the importance of the solder fillet height for optimum reliability. The effect of specimen preparation required for the moire´ experiment on the column deformation is also discussed to validate the experimental data.

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