A Novel Low-overhead Delay Testing Technique for Arbitrary Two-Pattern Test Application

AbstractDuring the COVID-19 pandemic it is essential to test as many people as possible, in order to detect early outbreaks of the infection. Present testing solutions are based on the extraction of RNA from patients using oropharyngeal and nasopharyngeal swabs, and then testing with real-time PCR for the presence of specific RNA filaments identifying the virus. This approach is limited by the availability of reactants, trained technicians and laboratories. One of the ways to speed up the testing procedures is a group testing, where the swabs of multiple patients are grouped together and tested. In this paper we propose to use the group testing technique in conjunction with an advanced replication scheme in which each patient is allocated in two or more groups to reduce the total numbers of tests and to allow testing of even larger numbers of people. Under mild assumptions, a 13 × average reduction of tests can be achieved compared to individual testing without delay in time.

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Detection of the TiO2 Concentration in the Protective Coatings for the Cultural Heritage by Means of Hyperspectral Data

Sustainability ◽

10.3390/su13010092 ◽

2020 ◽

Vol 13 (1) ◽

pp. 92

Author(s):

Antonio Costanzo ◽

Donatella Ebolese ◽

Silvestro Antonio Ruffolo ◽

Sergio Falcone ◽

Carmelo la Piana ◽

...

Keyword(s):

Titanium Dioxide ◽

Cultural Heritage ◽

Urban Areas ◽

Protective Coatings ◽

Colloidal Suspensions ◽

Hyperspectral Data ◽

Weight Percentage ◽

Stone Materials ◽

Test Application ◽

Nanoparticle Coatings

Nanotechnology-based materials are currently being tested in the protection of cultural heritage: ethyl silicate or silica nanoparticles dispersed in aqueous colloidal suspensions mixed with titanium dioxide are used as a coating for stone materials. These coatings can play a key role against the degradation of stone materials, due to the deposit of organic matter and other contaminants on the substrate, a phenomenon that produces a greater risk for the monuments in urban areas because of the increasing atmospheric pollution. However, during the application phase, it is important to evaluate the amount of titanium dioxide in the coatings on the substrate, as it can produce a coverage effect on the asset. In this work, we present the hyperspectral data obtained through a field spectroradiometer on samples of different stone materials, which have been prepared in laboratory with an increasing weight percentage of titanium dioxide from 0 to 8 wt%. The data showed spectral signatures dependent on the content of titanium dioxide in the wavelength range 350–400 nm. Afterwards, blind tests were performed on other samples in order to evaluate the reliability of these measurements in detecting the unknown weight percentage of titanium dioxide. Moreover, an investigation was also performed on a test application of nanoparticle coatings on a stone statue located in a coastal town in Calabria (southern Italy). The results showed that the surveys can be useful for verifying the phase of application of the coating on cultural heritage structures; however, they could also be used to check the state of the coated stone directly exposed over time to atmospheric, biological and chemical agents.

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Development of Programming Ability Test Application For Informatics Students

Journal of Physics Conference Series ◽

10.1088/1742-6596/1569/3/032098 ◽

2020 ◽

Vol 1569 ◽

pp. 032098

Author(s):

S R Nurdin ◽

IGPE Prismana ◽

D R Prehanto ◽

IKD Nuryana

Keyword(s):

Ability Test ◽

Test Application ◽

Programming Ability

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Recatest—A Technique for Qualitative and Quantitative Assessment of Deferment and Degraded PVD Coatings and CVD Layers in the Deformed Area in the Scratch Test

Materials ◽

10.3390/ma14102625 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2625

Author(s):

Piotr Domanowski ◽

Marek Betiuk

Keyword(s):

Scratch Test ◽

Metallographic Analysis ◽

Tool Steels ◽

Test Device ◽

Coating Structure ◽

Testing Technique ◽

Coating Materials ◽

Qualitative And Quantitative ◽

Quantitative Parameters

The purpose of the paper is to present a new Recatest testing technique which uses a series of abrasions within a scratch and its innovative application to describe selected quantitative parameters of locally, plastically deformed substrate and coating materials detected on the spherical microsection in the scratch test. The exposed material structures are subject to a metallographic analysis which allows for the determination of the quantitative parameters, which in turn allow for a description of the change in dynamics of the coating structure within the scratch area as a function of load. These parameters include scratch depth (hs), coating thickness (h1), flash height (hoc, hos), depth of intended material (hd), material depth under scratch (hcp), and material depth under coating (hdb). The paper also includes a description of the Recalo test device designed by the authors, which is used to make a series of spherical abrasion traces on the scratch surface. Recalo is dedicated to the Recatest technique. The analysed material was the CrN/CrCN/HS6-5-2, AlCrN -Alcrona-Balinit/D2 coatings deposited on tool steels.

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