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Vol. 23 (2022), No. 2 (67), 2022

 

This issue of the RECENT journal was edited with the support of:

 


Contents


Modelling the Tensile Properties of HDPE Composite Materials with Poly (vinyl acetate) Coated Calcium Carbonate Filler

  • Catalin CROITORU, Ionut Claudiu ROATA, Edit Roxana MOLDOVAN, Mihai Alexandru LUCA

RECENT J. (2022), 67:050-054

https://doi.org/10.31926/RECENT.2022.67.050

Abstract

Amorphous calcium carbonate particles with average diameter of 56 µm have been coated with poly (vinyl acetate) to improve their adhesion to a thermoplastic polymer matrix such as high-density polyethylene. The resulting composite materials, obtained by compression moulding of the coated calcium carbonate filler and polyethylene matrix at 140 C present improved tensile strengths, in comparison with the reference material, obtained without poly (vinyl acetate) coating. The mechanical properties of the composite assembly have been modelled with Digimat-FE software, obtaining a satisfactory correlation between the experimental results and the simulated tensile strength.

Keywords

composite materials, compression moulding, poly (vinyl acetate), mechanical strength

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Intelligent System for Lighting Control in Smart Buildings

  • Mariana FRATU

RECENT J. (2022), 67:055-058

https://doi.org/10.31926/RECENT.2022.67.055

Abstract

This paper presents an adaptive architecture that centralizes the control of buildings’ lighting and intelligent management to economize lighting and maintain maximum visual comfort in illuminated areas. To carry out this management, the architecture merges various techniques of artificial intelligence. It achieves optimization in terms of both energy consumption and cost by using a modular architecture and is fully adaptable to current lighting systems. The architecture was successfully tested and validated and continues to be in development at Aula building of our university. The author expect this research to extend the study and adaptability of computer technique in design of Smart Buildings.

Keywords

intelligent systems, smart buildings, light sensors, autonomous control

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Advantages and Disadvantages of the National Recovery and Resilience Plan

  • Zsolt TOTH, Ionela-Roxana PUIU, Shih-Shuan WANG, Mircea BOȘCOIANU

RECENT J. (2022), 67:059-066

https://doi.org/10.31926/RECENT.2022.67.059

Abstract

The National Recovery and Resilience Plan (PNRR) is part of the Next Generation EU project, through which the European Union (EU) wants to ensure the economic recovery of the 27 member states, as a reaction to the economic loss suffered following COVID-19 pandemic restrictive measures. The PNRR advantages are that Romania has been allocated almost 30 billion Euros for the period 2021-2026, half grants and half loans. The EU borrows cheaply and gives us the money with the same low interest rate, in plus we get some free money. Romania has an obligation to implement many reforms, to raise quality standards and improve living standards. PNRR is the best thing in Romania's history, as it will develop us as a country far beyond what we were in 1989 when we were the only country in history known with zero debt. Romania has grown a lot economically in the last 30 years and the trend will continue. According to EU standards, the minimum wage must rise to 60% of the average wage, compared to 40% at present. The PNRR disadvantages are that nothing is free, quality costs and hidden defects can occur. In general, cheap things are poor quality and should be avoided. PNRR is too rigid and we will probably not attract all the money allocated. We will have the same prices as in developed countries, and taxes will rise to the same level as theirs. Ordinary people think inflation is high and life is expensive. There will be higher and higher prices and it is not worth keeping money in the bank because interest rates are lower than inflation. Everyone is borrowing, although it is not good to borrow, we have high debts of 49% of GDP and most of the other EU countries have even higher debts. In recent years budget spending has been increasing too much and future generations will pay for the borrowed money. At this rate, if we have debts of over 60% of GDP, we cannot switch to the Euro currency and risk ending up like Greece, which has debts of 200% of GDP.

Keywords

PNRR, EU, reforms, quality, development

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Choosing the IR Sealing Equipment of Automotive Wiring Using the ELECTRE Method

  • Nicoleta RACHIERU

RECENT J. (2022), 67:067-073

https://doi.org/10.31926/RECENT.2022.67.067

Abstract

For any vehicle the electrical equipment is a basic component, the operation of which has repercussions on consumption, pollution, driving comfort, road safety, etc. Automobile manufacturers pay particular attention to improving the price-quality ratio and customer satisfaction. In this sense, they are constantly concerned with the use of the best performing equipment in the production processes. This paper deals with aspects regarding the sealing operation in the technological process of manufacturing car wiring, the use of IR technology in sealing and the use of the ELECTRE method for the decision regarding the replacement of a sealing equipment, the Minipack TAD oven, with a modern version that uses IR technology.

Keywords

IR technology, car wiring, ELECTRE method, sealing oven

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