2D PROBLEM FOR A SPHERE IN THE FRACTIONAL ORDER THEORY THERMOELASTICITY TO AXISYMMETRIC TEMPERATURE DISTRIBUTION

In the present article, we implement the fractional thermoelasticity theory to a 2D issue for a sphere whose surface is free from traction, subject to a provided axisymmetric temperature distribution of heat. The medium is supposed to be quiescent initially. A direct method is used to get a solution and the Laplace transform technique is used. Mathematical models for copper material are designed as a particular instance. Numerical results are computed with help of Mathcad software and graphically represented and the fractional-order parameter effect has been explained.

Rapidly Self-Sterilizing PPE Capable of Destroying 100% of Microbes in 30-60 Seconds

The continued proliferation of superbugs in hospitals and the coronavirus disease 2019 (COVID-19) has created an acute worldwide demand for sustained broadband pathogen suppression in households, hospitals, and public spaces. In response, we have created a highly active, self-sterilizing copper configuration capable of inactivating a wide range of bacteria and viruses in 30-60 seconds. The highly active material destroys pathogens faster than any conventional copper configuration and acts as quickly as alcohol wipes and hand sanitizers. Unlike the latter, our copper material does not release volatile compounds or leave harmful chemical residues and maintains its antimicrobial efficacy over sustained use; it is shelf stable for years. We have performed rigorous testing in accordance with guidelines from U.S. regulatory agencies and believe that the material could offer broad spectrum, non-selective defense against most microbes via integration into masks, protective equipment, and various forms of surface coatings.

Depot medených predmetov z Mníchovej Lehoty (okr. Trenčín). Príspevok k poznaniu antimónovej medi typu Nógrádmarcal v období staršieho eneolitu / Depotfund von Kupfergegenständen aus Mníchova Lehota (Bez. Trenčín). Beitrag zur Erkennung des Antimonkupfers vom Typ Nógrádmarcal in dem älteren Aeneolithikum

Hoard of Copper Artefacts from Mníchova Lehota (Distr. Trenčín). Contribution to the Issue and Distribution of the Antimony Copper of Nógrádmarcal Type in the Early Copper Age. Submitted paper deals with the archaeological evaluation and elemental analysis of a collection of copper industry from the cadastre of municipality Mníchova Lehota (distr. Trenčín) in the north-west Slovakia. The hoard consists of two flat copper axes and a copper chisel. The basic typological-chronological analysis of the flat copper axes showed their connection with the Southeast European types and varieties of the series Pločnik, Coteana, Gumelniţa, as well as Central European types Stollhof, Strážnice, Kalinowice Dolne and axes of the group III of J. Říhovský. Statistical evaluation of basic morphometric parameters of the artefacts by means of principal component analysis (PCA) suggests that the objects from the hoard from Mníchova Lehota belong to the Central European shapes. Separate issue is the elemental analysis of the copper artefacts by means of inductively coupled plasma – mass spectrometry (ICP-MS) and X-ray fluorescence spectroscopy (XRF). On the basis of the statistical evaluation of the elemental analyses the authors set the origin of the copper material mainly in the antimonic copper. They pay attention to its distribution in the area of Central Europe and possible location of the copper material deposit.

Analisis Perbandingan Jenis Material Penukar Kalor Plat Datar Aliran Silang Untuk Proses Pengeringan Kayu

The processed wood industry urgently needs a dryer to improve the quality of its production. One of the important components in a dryer is a heat exchanger. To support a durable heat transfer process, a superior material is needed. The aim of the study was to analyze the effectiveness of the application of cross-flow flat plate heat exchangers to be used in wood dryers and compare the materials used and simulate heat transfer on cross-flow flat plate heat exchangers using Computational Fluid Dynamic simulations. The results showed that there was a variation in the temperature out of dry air and gas on the flat plate heat exchanger and copper material had a better heat delivery by reaching the temperature out of dry air and gas on the flat plate type heat exchanger of successive cross flow and. overall heat transfer coefficient value and the effectiveness value of the heat exchanger of the heat transfer characteristics that occur with the cross-flow flat plate type heat exchanger in copper material of 251.74725 W/K and 0.25.

Spectroscopic Analysis of DC-Nitrogen Plasma Produced using Copper Electrodes

This study shows the effects of copper material electrode, applied voltage, and different pressure values on electrical discharge plasma. The purpose of the work is the application of the spectral analysis method to obtain accurate results of nitrogen plasma parameters. By using the optical emission spectroscopy (OES), many N2 molecular spectra peaks appeared in the range from 300 to 480 nm. Also, some additional peaks were recorded, corresponding to atomic and ionic lines for nitrogen, target material, and hydrogen, in all samples. The electron density (ne) was calculated from the measurement of Stark broadening effect, which was found to decrease with increasing pressure from 0.1 mbar to 0.8 mbar. The higher emission intensities occurred at 0.2 mbar working pressure and were reduced with higher pressure. The vibrational temperature (Tvib) for N2 increased from 0.17 to 0.33 eV with increasing the pressure from 0.15 mbar to 0.2 mbar, then decreased to 0.25 eV with increasing the pressure to 0.8 mbar. Other plasma parameters were studied, which are electron temperature (Te), plasma frequency of electron ( ), and Debye length (λD).

MULTI BAND MICRO STRIP PATCH ANTENNA FOR WIRELESS APPLICATIONS

This research paper aims to design a new shape of the microstrip patch antenna. Combining a half circular and zigzag shape of a triangular patch antenna, we selected two different shapes of microstrip patch to obtained modern shape no one mentioned it before and it’s seems like a tulip rose, so this design achieved to works for multiband. The dimensions of the proposed antenna are (38×30×1.6) mm3 applied on the dielectric substrate FR-4, which has a relative dielectric constant of (εr=4.3) and loss tangent (tanδ=0.002). Both patch and ground are copper material with a thickness (t=0.035 mm). So four-band are achieved (5.1612-5.3874) GHz, (8.8729-10.067) GHz, (10.476-11.091) GHz, and (13.819-30) GHz. The return loss (S11) are (-20.784) dB, (-30.532) dB, (-19.246) dB and (-29.789) dB respectively. The antenna is printed by using FR-4 substrate and simulated by CST-Microwave studio software. This antenna works for various wireless applications such as Wi-FI, C band, X band, Ku band, Ka-band, cellular phones, and satellite communications.