scholarly journals Determination of St. George Basilica Tower Historical Inclination from Contemporary Photograph

2011 ◽  
Vol 6 ◽  
pp. 212-219
Author(s):  
Bronislav Koska
Keyword(s):  
Standard Deviation ◽  
Visual Information ◽  
Bundle Adjustment ◽  
Long Term Stability ◽  
The North ◽  
Research Activities ◽  
Geometrical Information ◽  
Historical Photographs

A large amount of photographic material has been accumulated from the photography emerge in the nineteenth century. The most photographs record portraits, urbanistic complex, significant architecture and others important objects in the photography inception. Historical photographs recorded a huge amount of information, which can be use for various research activities. Photograph visual information is sufficient in many cases, but accurate geometrical information must be acquired from it in specific situations. It is the case of long-term stability monitoring of buildings in the Prague Castle area see [1]. For static analysis in the monitoring project, it is necessary to determine accurately specific geometrical parameter – mutual angle of St. George Basilica towers in the north-south direction before the reconstruction started in 1888. The angle standard deviation must be solved as well. The task demanded using of photogrammetric methods. Own implementation of general bundle adjustment had to be created to fulfill determination of reliable standard deviation of the angle, because standard photogrammetric software does not have all the necessary options.

scholarly journals Using MoS2/Fe3O4 as Ion-Electron Transduction Layer to Manufacture All-Solid-State Ion-Selective Electrode for Determination of Serum Potassium

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 155
Author(s):  
Yan Su ◽  
Ting Liu ◽  
Caiqiao Song ◽  
Aiqiao Fan ◽  
Nan Zhu ◽  
...  
Keyword(s):  
High Performance ◽  
Accurate Determination ◽  
Water Layer ◽  
Ion Selective Electrode ◽  
Potential Response ◽  
Selective Electrode ◽  
Response Measurement ◽  
Long Term Stability

As an essential electrolyte for the human body, the potassium ion (K+) plays many physiological roles in living cells, so the rapid and accurate determination of serum K+ is of great significance. In this work, we developed a solid-contact ion-selective electrode (SC-ISE) using MoS2/Fe3O4 composites as the ion-to-electron transducer to determine serum K+. The potential response measurement of MoS2/Fe3O4/K+-ISE shows a Nernst response by a slope of 55.2 ± 0.1 mV/decade and a low detection limit of 6.3 × 10−6 M. The proposed electrode exhibits outstanding resistance to the interference of O2, CO2, light, and water layer formation. Remarkably, it also presents a high performance in potential reproducibility and long-term stability.

Determination of Long-Term Stability and Quality of HT-PEM MEAs

2018 ◽  
Vol 86 (13) ◽  
pp. 301-314
Author(s):  
Maren Rastedt ◽  
Julian Büsselmann ◽  
Tomas Klicpera ◽  
Karsten Reinwald ◽  
Nadine Pilinski ◽  
...  
Keyword(s):  
Term Stability ◽  
Long Term Stability

scholarly journals Separation of Arsenic and Selenium Species by Capillary Zone Electrophoresis in a Coated Capillary

1999 ◽  
Vol 82 (6) ◽  
pp. 1587-1593 ◽  
Author(s):  
Natalia G Vanifatova ◽  
Boris Y Spivakov ◽  
Juergen Mattusch ◽  
Rainer Wennrich
Keyword(s):  
Capillary Zone Electrophoresis ◽  
Sensitivity Enhancement ◽  
Selenium Species ◽  
Long Term Stability ◽  
Zone Electrophoresis ◽  
Electrophoresis Method ◽  
Capillary Zone ◽  
Matrix Removal

Abstract A capillary zone electrophoresis method was developed for the determination of 8 arsenic and selenium species in a polymer-coated capillary. Large-volume stacking with matrix removal was used for sensitivity enhancement. The entire analysis time was only a few minutes. The experimental sensitivity enhancement for 7 species was found to be near its theoretical value. Coating capillaries for long-term stability in alkaline buffer electrolytes was also investigated.

scholarly journals Electrodeposition of Pd-Pt Nanocomposites on Porous GaN for Electrochemical Nitrite Sensing

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 606 ◽  
Author(s):  
Rui Xi ◽  
Shao-Hui Zhang ◽  
Long Zhang ◽  
Chao Wang ◽  
Lu-Jia Wang ◽  
...  
Keyword(s):  
Environmental Samples ◽  
Food Industry ◽  
Biological Process ◽  
High Sensitivity ◽  
Good Reproducibility ◽  
Practical Application ◽  
Long Term Stability ◽  
Nitrite Content

In recent years, nitrite pollution has become a subject of great concern for human lives, involving a number of fields, such as environment, food industry and biological process. However, the effective detection of nitrite is an instant demand as well as an unprecedented challenge. Here, a novel nitrite sensor was fabricated by electrochemical deposition of palladium and platinum (Pd-Pt) nanocomposites on porous gallium nitride (PGaN). The obtained Pd-Pt/PGaN sensor provides abundant electrocatalytic sites, endowing it with excellent performances for nitrite detection. The sensor also shows a low detection limit of 0.95 µM, superior linear ampere response and high sensitivity (150 µA/mM for 1 to 300 µM and 73 µA/mM for 300 to 3000 µM) for nitrite. In addition, the Pd-Pt/PGaN sensor was applied and evaluated in the determination of nitrite from the real environmental samples. The experimental results demonstrate that the sensor has good reproducibility and long-term stability. It provides a practical way for rapidly and effectively monitoring nitrite content in the practical application.

scholarly journals A 23-Year Retrospective Blind Check of Accuracy of the Copenhagen Radiocarbon Dating System

Radiocarbon ◽  
1999 ◽  
Vol 41 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Kaare L Rasmussen ◽  
Henrik Tauber ◽  
Niels Bonde ◽  
Kjeld Christensen ◽  
Páll Theodórsson
Keyword(s):  
Standard Deviation ◽  
Tree Rings ◽  
Radiocarbon Dating ◽  
Average Difference ◽  
Blind Test ◽  
Term Stability ◽  
Long Term Stability ◽  
Measuring Accuracy ◽  
Sample Age

A 23-yr record of the measuring accuracy of the Copenhagen radiocarbon dating laboratory has retrospectively been provided through a true blind test. A total of 92 samples of oak from old tree trunks were dated in the period 1971 to 1993 and their dendrochronological age determined independently. The 14C activity of the dendrochronological samples measured in the Copenhagen radiocarbon laboratory was compared to the activity of the tree rings of the same age measured by Stuiver and Pearson (1993) for calibration purposes. The average difference was found to be 54 ± 72 14C yr. The results further indicate that the actual standard deviation is only 7% higher than that quoted by the laboratory. The investigation has shown a long-term stability of laboratory accuracy with no systematic laboratory variations either with respect to sample age or to the time of measurement from 1971 to 1993.

scholarly journals Timepix3 Luminosity Determination of 13 TeV Proton-Proton Collisions at the ATLAS Experiment

2020 ◽  
Vol 225 ◽  
pp. 01002
Author(s):  
Andreé Sopczak
Keyword(s):  
Simple Model ◽  
Number Of Clusters ◽  
Proton Proton ◽  
Proton Collisions ◽  
Atlas Experiment ◽  
Long Term Stability ◽  
Counting Methods ◽  
Proton Proton Collisions

Medipix and Timepix devices, installed in the ATLAS cavern at the LHC, have provided valuable complementary luminosity information. Results are presented from measurements with Timepix3 (TPX3) detectors. In contrast with previously employed frame-based data acquisition, the TPX3 detector remains active continuously, sending information on pixel hits as they occur. Hit- and cluster-counting methods were used for the luminosity determination of the LHC protonproton collisions. The LHC luminosity versus time is determined using these two methods and fitted to a simple model, which incorporates luminosity reduction from single bunch and beam-beam interactions. The precision of the luminosity determination could be improved by counting the number of clusters, instead of just pixel hits. The internal precision and long-term stability of the TPX3 luminosity measurement are below 0.5%. TPX3, owing to its 1.56 ns time-tagging, is able to resolve the time structure of the luminosity due to the collisions of individual proton bunches when integrated over an LHC fill.

scholarly journals CALIBRATION AND STABILITY ANALYSIS OF THE VLP-16 LASER SCANNER

2016 ◽  
Vol XL-3/W4 ◽  
pp. 55-60 ◽  
Author(s):  
C. L. Glennie ◽  
A. Kusari ◽  
A. Facchin
Keyword(s):  
Stability Analysis ◽  
Point Cloud ◽  
Temporal Stability ◽  
Laser Scanner ◽  
Effect Of Temperature ◽  
Geometric Calibration ◽  
Long Term Stability ◽  
The Individual

We report on a calibration and stability analysis of the Velodyne VLP-16 LiDAR scanner. The sensor is evaluated for long-term stability, geometric calibration and the effect of temperature variations. To generalize the results, three separate VLP-16 sensors were examined. The results and conclusions from the analysis of each of the individual sensors was similar. We found that the VLP-16 showed a consistent level of performance, in terms of range bias and noise level over the tested temperature range from 0–40 °C. A geometric calibration was able to marginally improve the accuracy of the VLP-16 point cloud (by approximately 20%) for a single collection, however the temporal stability of the geometric calibration negated this accuracy improvement. Overall, it was found that there is some long-term walk in the ranging observations from individual lasers within the VLP-16, which likely causes the instability in the determination of geometric calibration parameters. However, despite this range walk, the point cloud delivered from the VLP-16 sensors tested showed an accuracy level within the manufacturer specifications of 3 cm RMSE, with an overall estimated RMSE of range residuals between 22 mm and 27 mm.

scholarly journals Electrochemical Sensing of Serotonin by a Modified MnO2-Graphene Electrode

Biosensors ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 33 ◽  
Author(s):  
Lavanya Nehru ◽  
Sekar Chinnathambi ◽  
Enza Fazio ◽  
Fortunato Neri ◽  
Salvatore Gianluca Leonardi ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Electrochemical Sensing ◽  
Modified Glassy Carbon Electrode ◽  
Microwave Irradiation Method ◽  
Selective Determination ◽  
Long Term Stability ◽  
Mno2 Nanoparticles ◽  
Composition Structure

The development of MnO2-graphene (MnO2-GR) composite by microwave irradiation method and its application as an electrode material for the selective determination of serotonin (SE), popularly known as “happy chemical”, is reported. Anchoring MnO2 nanoparticles on graphene, yielded MnO2-GR composite with a large surface area, improved electron transport, high conductivity and numerous channels for rapid diffusion of electrolyte ions. The composite was characterized by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and scanning electron microscopy (SEM) for assessing the actual composition, structure and morphology. The MnO2-GR composite modified glassy carbon electrode (GCE) exhibited an excellent electrochemical activity towards the detection of SE in phosphate buffer saline (PBS) at physiological pH of 7.0. Under optimum conditions, the modified electrode could be applied to the quantification of serotonin by square wave voltammetry over a wide linear range of 0.1 to 800 µM with the lowest detection limit of 10 nM (S/N = 3). The newly fabricated sensor also exhibited attractive features such as good anti-interference ability, high reproducibility and long-term stability.

An effective and sensitive environmental pollutant sensor for pymetrozine

2020 ◽  
Author(s):  
Yudong Gao ◽  
Huimin Li ◽  
Yapan Shi
Keyword(s):  
Limit Of Detection ◽  
Single Walled Carbon Nanotubes ◽  
Environmental Pollutant ◽  
Voltammetric Sensor ◽  
Modified Glassy Carbon Electrode ◽  
Long Term Stability ◽  
Walled Carbon Nanotubes ◽  
Electrochemistry Behavior

Abstract Pymetrozine plays an important role in agriculture safety supervision. Accurate and rapid detection of pymetrozine in real sample is count for much as this is the significant prerequisite for its effective monitoring. An effective and sensitive voltammetric sensor, based on single-walled carbon nanotubes (SWCNT) composite poly(L-arginine) film modified glassy carbon electrode, was fabricated, and used for determination of pesticide pymetrozine. Results suggests that the poly(L-arginine)/SWCNT modified electrode exhibited a very low limit of detection. In addition, selectivity, long-term stability, and practical applicability of the developed sensor were evaluated. Hence, the developed poly(L-arginine)/SWCNT/GCE displayed excellent electrochemistry behavior towards the sensing of pymetrozine with good sensitivity, selectivity, and reproducibility. The detection technique successfully achieved the determination of pymetrozine in the concentration range 0.05μM ∼1.0μM with the detection limits of 17 nM (S/N=3).

The Evaluation of the PXQ for the Analysis of Cements and Related Materials

1958 ◽  
Vol 2 ◽  
pp. 215-227
Author(s):  
George Andermann ◽  
J. L. Jones ◽  
E. Davidson
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Applied Research ◽  
Production Control ◽  
Helium Flow ◽  
X Ray ◽  
Long Term Stability ◽  
Short And Long Term

AbstractThe analysis of cements and ores has been studied using the Applied Research Laboratories, Inc. Production Control X-ray Quantometer (PXQ), Elements included in the program were magnesium, aluminum, silicon, phosphorus, calcium and iron. The PXQ, utilizing the polychromator concept, allows the simultaneous determination of the listed elements.Focusing ADP, EDT, quartz and LiF crystals were used with flow Geigers or Multitrons. Helium paths were used as required. The choice of crystals, detectors, and slit widths was determined to give optimum results for each element.The effects of briquetting and ratioing to scattered background on accuracy were studied. Various instrumental factors such as helium flow rate, detector gas flow rate, short and long term stability were also investigated.

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