scholarly journals Design of an electrochemiluminescence detection system through the regulation of charge density in a microchannel

2021 ◽  
Vol 12 (39) ◽  
pp. 13151-13157
Author(s):  
Yanling Huang ◽  
Yilei Lu ◽  
Xiaobin Huang ◽  
Jian Wang ◽  
Bin Qiu ◽  
...  
Keyword(s):  
Charge Density ◽  
Detection System ◽  
Ionic Current ◽  
First Time

The microchannel-based target sensing and ECL reporting reactions were combined for the first time. This configuration separated the sensing and reporting reactions to achieve ionic current direct regulating ECL reporting.

Raman-Spektren von SnJ4, GeJ4, TiBr4 und TiJ4 in flüssiger und kristalliner Phase / Raman Spectra of SnJ4, GeJ4, TiBr4, and TiJ4 in the Liquid and Crystalline Phase

1970 ◽  
Vol 25 (12) ◽  
pp. 1374-1381 ◽  
Author(s):  
W. Kiefer ◽  
H. W. Schrötter
Keyword(s):  
Raman Spectra ◽  
Ruby Laser ◽  
Detection System ◽  
Point Group ◽  
Visible Region ◽  
Group Symmetry ◽  
Pure Liquid ◽  
Electronic Detection ◽  
Polarization Studies ◽  
First Time

The Raman spectra of four molecules absorbing in the visible region (SnJ4, GeJ4, TiBr4, and TiJ4) are presented. They were excited with a quasi-continuous ruby laser and recorded with a special electronic detection system. Except for TiJ4, complete Raman spectra of crystal powder pellets could be obtained for the first time. The assignment reported by previous authors was confirmed by accurate polarization studies of solutions or pure liquid. The assignment is also in the solid state possible on the basis of Td point group symmetry. The fundamental vibrations of TiJ4 in solutions are: ν1 (A1) =162, ν2 (E) =51, ν3 (F2) =319 and ν4 (F2) Y = 67 cm-1

scholarly journals An Intrusion Detection System for Smart Grid Neighborhood Area Network

2021 ◽  
Author(s):  
Nasim Beigi Mohammadi
Keyword(s):  
Intrusion Detection ◽  
Smart Grid ◽  
Intrusion Detection System ◽  
Detection System ◽  
Area Network ◽  
Wormhole Attack ◽  
Detection Systems ◽  
Wireless Mesh ◽  
First Time ◽  
Neighborhood Area Network

Smart grid is expected to improve the efficiency, reliability and economics of current energy systems. Using two-way flow of electricity and information, smart grid builds an automated, highly distributed energy delivery network. In this thesis, we present the requirements for intrusion detection systems in smart grid, neighborhood area network (NAN) in particular. We propose an intrusion detection system (IDS) that considers the constraints and requirements of the NAN. It captures the communication and computation overhead constraints as well as the lack of a central point to install the IDS. The IDS is distributed on some nodes which are powerful in terms of memory, computation and the degree of connectivity. Our IDS uses an analytical approach for detecting Wormhole attack. We simulate wireless mesh NANs in OPNET Modeler and for the first time, we integrate our analytical model in Maple from MapleSoft with our OPNET simulation model.

scholarly journals GEM-Based Detectors for Direct Detection of Low-Mass WIMP, Solar Axions and Narrow Resonances (Quarks)

2021 ◽  
Author(s):  
Victor Parusov ◽  
Boris Ovchinnikov
Keyword(s):  
Direct Detection ◽  
Detection System ◽  
Beta Particle ◽  
Gaseous Mixtures ◽  
Low Mass ◽  
Nonzero Spin ◽  
Time Projection ◽  
First Time ◽  
Solar Axions ◽  
Low Mass Wimp

Gas electron multipliers (GEMs) with wire (WGEMs) or metal electrodes (MGEMs), which don’t use any plastic insulators between electrodes are created. The chambers containing MGEMs (WGEMs) with pin-anodes are proposed as detectors for searching of spin-dependent interactions between Dark Matter (DM) particles and gases with nonzero-spin nuclei (H2, D2, 3He, 21Ne, CF4, CH4, etc.). In this paper, we present a review of such chambers. For investigation of the gas mixtures Ne+10%H2, H2 (D2) +3ppmTMAE, the chamber containing WGEM with pin-anode detection system was constructed. In this paper we present the results of an experimental study of these gaseous mixtures exited by an α - source. Mixture of Ar + 40 ppm C2H4 and mixture 50% Xe + 50%CF4 have been investigated. The spatial distributions of photoelectron clouds produced by primary scintillations on α- and β-particle tracks, as well as the distributions of photoelectron clouds due to photons from avalanches at the pin-anode, have been measured for the first time. In our experiments as another filling of the chambers for search of low-mas WIMP (<10 GeV/c2), solar neutrino and solar axions with spin-dependent interaction we propose to use the mixtures: D2 + 3ppmTMAE, 3He + 3%CH4, 21Ne + 10%H2, at pressure 10-17 bar. And in our experiment with liquid gases is used the mixtures with 19F (LAr + CF4, LXe + CF4) and mixture LCH4 + 40ppm TMAE. The time projection chamber (TPC) with the mixture D2 + 3ppmTMAE filling allow to search of spin-dependent interactions of solar axions and deuterium. As well as we present the detecting systems for search of narrow pp-resonances (quarks) in accelerators experiments.

Low-frequency electrical conductivity of aqueous kaolinite suspensions: surface conductance, electrokinetic potentials and counterion mobility

Clay Minerals ◽  
2017 ◽  
Vol 52 (3) ◽  
pp. 299-313 ◽  
Author(s):  
Christian Weber ◽  
Helge Stanjek
Keyword(s):  
Charge Density ◽  
Surface Charge Density ◽  
Volume Fraction ◽  
Low Frequency ◽  
Surface Conductivity ◽  
Evaluation Procedure ◽  
Surface Conductance ◽  
Consistency Check ◽  
Data Set ◽  
First Time

AbstractThe low-frequency conductivity of aqueous kaolinite suspensions has been measured as a function of volume fraction and concentration of KCl, K2SO4and BaCl2, respectively. These measurements were interpreted with a theoretical model accounting for surface conductivity and particle shape. For the first time, an internally consistent data set was established by measuring all parameters necessary to solve the relevant equations. The simultaneous availability of surface conductivity, surface charge density and diffuse layer charge density permitted the estimation of counterion mobilities in the stagnant layer and a consistency check for the evaluation procedure of the conductivity experiments. In agreement with current literature results, monovalent counterions were found to have a Stern layer mobility similar to their bulk mobility, whereas the mobility of divalent counterions in this layer is reduced by a factor of ∼2.

scholarly journals EnVision+, a New Dextran Polymer-based Signal Enhancement Technique for In Situ Hybridization (ISH)

2001 ◽  
Vol 49 (9) ◽  
pp. 1067-1071 ◽  
Author(s):  
Klaus Hermann Wiedorn ◽  
Torsten Goldmann ◽  
Christof Henne ◽  
Heike Kühl ◽  
Ekkehard Vollmer
Keyword(s):  
In Situ Hybridization ◽  
Signal Amplification ◽  
Detection System ◽  
Lower Sensitivity ◽  
The Novel ◽  
Visualization System ◽  
Integrated Optical ◽  
Assay Time ◽  
First Time

Seventy paraffin-embedded cervical biopsy specimens and condylomata were tested for the presence of human papillomavirus (HPV) by conventional in situ hybridization (ISH) and ISH with subsequent signal amplification. Signal amplification was performed either by a commercial biotinyl-tyramide-based detection system [GenPoint (GP)] or by the novel two-layer dextran polymer visualization system EnVision+ (EV), in which both EV–horseradish peroxidase (EV–HRP) and EV–alkaline phosphatase (EV–AP) were applied. We could demonstrate for the first time, that EV in combination with preceding ISH results in a considerable increase in signal intensity and sensitivity without loss of specificity compared to conventional ISH. Compared to GP, EV revealed a somewhat lower sensitivity, as measured by determination of the integrated optical density (IOD) of the positively stained cells. However, EV is easier to perform, requires a shorter assay time, and does not raise the background problems that may be encountered with biotinyl–tyramide-based amplification systems. (J Histochem Cytochem 49:1067–1071, 2001)

Spatial dispersion of lone electron pairs? – Experimental charge density of cubic arsenic(iii) oxide

2015 ◽  
Vol 17 (16) ◽  
pp. 11020-11027 ◽  
Author(s):  
Piotr A. Guńka ◽  
Zygmunt Gontarz ◽  
Janusz Zachara
Keyword(s):  
Charge Density ◽  
Lone Electron Pair ◽  
Electron Pair ◽  
Spatial Dispersion ◽  
Electron Pairs ◽  
First Time ◽  
Experimental Charge Density

Lone electron pair dispersion into three separate domains in space is reported and discussed for the first time.

scholarly journals Quantification of aluminum in human bone with neutron activation analysis

2021 ◽  
Author(s):  
Kanakam Davis
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Detection System ◽  
Dose Equivalent ◽  
Minimum Detectable Limit ◽  
The Mean ◽  
First Time ◽  
In Vivo Neutron Activation

In Vivo Neutron Activation Analysis (IVNAA) has been investigated to measure aluminum levels in bone for several years. Aluminum, being a toxic element, should be routinely monitored in both clinical and occupational environments. The non-invasisve IVNAA technique developed at the McMaster University Accelerator Lab is currently being improved for future use. New sets of hand phantoms were prepared that closely resemble spectra that were collected from the hand of healthy subject. Following the IVNAA of aluminum phantoms, the technique was applied for the first time to measure bone A1 levels in 18 healthy subjects. The mean hand bone A1 concentration was determined as 28 µg A1/g Ca. The results were achieved with a dose equivalent of 17.6 mSv. Further investigations using an enhanced detection system and applying optimazation of the irradiation protocol with radiation dose up to 50 mSv showed that minimum detectable limit was improved to 0.10 mg A1.

scholarly journals An Accurate and Rapid System to Identify Play Patterns in Tennis Using Video Recording Material: Break Point Situations as a Case Study

2018 ◽  
Vol 62 (1) ◽  
pp. 199-212 ◽  
Author(s):  
Iván Prieto-Lage ◽  
M.A. Prieto ◽  
Thomas P. Curran ◽  
Alfonso Gutiérrez-Santiago
Keyword(s):  
Rapid Detection ◽  
Pattern Analysis ◽  
Detection System ◽  
Video Recording ◽  
Break Point ◽  
Tennis Players ◽  
Recording Material ◽  
Break Points ◽  
First Time

AbstractThe goal of this study was to present an accurate and rapid detection system to identify patterns in tennis, based on t-pattern analysis. As a case study, the break point situations in the final matches of the clay court tournaments played during the seasons 2011 and 2012 between the tennis players Novak Djokovic and Rafael Nadal were chosen. The results show that Nadal achieves a higher conversion rate with respect to Djokovic in the break point situations, independent of the outcome of the match. Some repetitive patterns of both players were revealed in break point circumstances. In long rally sequences (higher than seven hits), the Spanish player won more break points, both serving and receiving, as a result of unforced errors of his opponent’s backhand. In medium rally sequences (between four and seven hits), other factors such as the type, direction or serve location have shown to play an important role in the outcome of the point. The study also reveals that Djokovic frequently commits double faults in these critical situations of the match. This is the first time that t-patterns have been used to analyze the sport of tennis. The technique is based on computer vision algorithms and video recording material to detect particular relationships between events and helps to discover the hidden mechanistic sequences of tennis players.

Probing Bacterial Flagellar Polymorphism in Various Fluidic Environments Using Solid-State Sub-Micropores

2008 ◽  
Author(s):  
Rafael Mulero ◽  
William R. Hesse ◽  
Liang Wu ◽  
Min Jun Kim
Keyword(s):  
Solid State ◽  
Environmental Conditions ◽  
Detection System ◽  
Ionic Current ◽  
Microfluidic System ◽  
Electrical Signal ◽  
Bacterial Flagella ◽  
Resistive Pulse ◽  
Novel Method ◽  
Current Blockage

A novel method for the detection of an assortment of environmental conditions in a microfluidic system using bacterial flagella and submicro-scale solid state pores is presented. Differences in various environmental conditions stimulate the polymorphic helix structure of Salmonella typhimurium flagella to transform to its lowest energetic conformation. By measuring the ionic current blockage (resistive pulse) as flagella electrophoretically translocate a submicro-scale pore, detection of the polymorphic state of flagella corresponding to the conditions of the environmental stimuli is possible. We test the viability of this method using purified depolymerized and repolymerized S. Typhimurium flagella and a high resolution electrical signal readout sub-micropore-based detection system.

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