Volume-7, Issue-10, October 2021

Abstract

The number of countries where the infection by a new coronavirus has been identified is constantly increasing. Accordingly, the amounts of infected people in the individual countries are alarming. The purpose of the present article is to provide information on this new, highly infectious disease and describe potential methods for reducing the risk of the infection transmission in our environment.

Keywords: COVID-19, coronavirus, symptoms of the disease, respirator.

References

Keywords: COVID-19, coronavirus, symptoms of the disease, respirator.

Abstract

The coronavirus pandemic significantly affects the lives of families, employees, employers, or sole proprietors, and it is therefore necessary to prevent its spread by using appropriate protective equipment. The article discusses the possibilities of protection against various forms of harmful particles, including the highly infectious virus SARS-CoV-2 using face protection respectively respiratory protection.

Keywords: COVID-19, respiratory protective equipment, surgical face masks.

References

Keywords: COVID-19, respiratory protective equipment, surgical face masks.

Abstract

This article discusses the possibility of natural gas odourisation, which is performed due to the fact that natural gas has no smell of its own. In order to facilitate the detection of potential gas leaks from distribution networks by the human sense of smell, the gas must be combined with an odourant. A concentration of such an odourant should be constant throughout the entire distribution network in order to facilitate the earliest possible detection of potential gas leaks.

This article also deals with the issues related to the odourisation of natural gas in a high-pressure pipeline in a gas distribution network. It presents a theoretical overview of the used types of odourants, odourant control methods, and a model of odourant behaviour in a distribution network in various conditions, which was created using numerical simulations performed in ANSYS software.

Keywords: natural gas, odourisation, ANSYS, pipeline.

References

Keywords: natural gas, odourisation, ANSYS, pipeline.

Abstract

This article describes the issue of hydrogen storage in metal hydrides and addresses the design of a heat exchanger and the calculation of heat transfer in low-pressure steel vessel with heat exchanger, which is used for hydrogen storage using La Ce Ni based metal alloys

Keywords: Heat exchanger, heat transfer, Hydrogen, hydrogen storage, metalhydride vessel.

References

Keywords: Heat exchanger, heat transfer, Hydrogen, hydrogen storage, metalhydride vessel.

Abstract

A preliminary chemical characterization of main components of toluene extract with dried rhizomes of Smilax domingensis Willd. that grow in Cuba was done using a GCMS-QP2010 Ultra Shimadzu and the mass spectra of the compounds found in the extract was matched with the National Institute of Standards and Technology (NIST) libraries. After sample derivatization 893 chemical compounds were registered by the equipment and from them, 30 different chemical components were characterized and reported for the first time from this part of the plant in our country. The results demonstrate that the developed method could be employed as a rapid and versatile analytical technique for identification of chemical constituents and quality control of Smilax domingensis.

Keywords: Smilax domingensis, chemical constituents, GC-MS, rhizomes, toluene extract

References

Keywords: Smilax domingensis, chemical constituents, GC-MS, rhizomes, toluene extract

Abstract

The present study concerns with the experimental and numerical investigation of crack stoppers ahead of an edge crack in panels subjected to tensile loading. Two different patches (rectangular and semi-annular patches) have been analyzed. The patches (aluminium and steel) are placed at different distance from the crack, symmetrically on both sides of the panel and at a finite distance ahead of the crack tip. A finite distance ahead of the crack tip reveals that depending on the distance, the crack tip could remain straight or curve. In such cases, the crack could either be arrested, run through or run around the reinforcements. Moreover, the degree of instability is reflected by an index parameter that accounts for the effect of load, geometry and material properties. Moreover, a geometrically nonlinear, two-dimensional (2D) finite element analysis (Comsol Multiphysics) has been employed to determine the local energy intensity. It would be of special interest to know whether the crack would run straight and arrest at the patch regardless of the other variables. The ultimate goal for straight crack path is to produce sufficient low local energy intensity. This gives a significant advantage because as the local energy intensity is increased, crack would tend to curve and lead to complete fracture of the patched specimens. It is equivalent of moving the patch closer to the crack tip. The predictions made from the strain energy density theory, as well as, there is a good agreement between finite element results and experimental findings.

Keywords: Comsol multiphysics, crack stoppers, energy density, reinforcement patch.

References

Keywords: Comsol multiphysics, crack stoppers, energy density, reinforcement patch.