International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The article reviews the chemical and active compounds of the lyophilized essential oil of Thymus vulgaris L. and its preservation qualities. Thymus vulgaris is a medicinal plant belonging to the Lamiaceae family, with a long history of use for its therapeutic properties. The essential oil of T. vulgaris has been widely studied for its antimicrobial, antioxidant, and anti-inflammatory activities. The amounts and types of chemical compounds can vary depending on the genetic differences or environmental conditions of the plant materials. The primary components of the essential oil responsible for most of its biological effects include thymol, carvacrol, and p-cymene. The essential oil of T. vulgaris has been reported to exhibit a wide range of pharmacological activities, including antimicrobial, antioxidant, anti-inflammatory, antifungal, and antiviral activities. In recent years, there has been increasing interest in the use of T. vulgaris essential oil as a natural preservative in food products.

Impact of changing compression ratio by varying the combustion chamber geometry on the engine performance was investigated, SI single cylinder air-cooled engine fuelled with unleaded gasoline and pure ethanol was used. These tests were conducted on three different compression ratios of, 7:1 8.5:1, and 10:1 with a wide-open throttle, and three different ignition timing, before and after top died centre. . The results showed that the BMEP (brake mean effective pressure), BTE (brake thermal efficiency), and BSFC (brake specific fuel consumption) obtained with the use of gasoline blends at all CRs were generally increased when they were compared to those of pure gasoline. In general, ethanol provided a lower exhaust emission compared to gasoline’s emissions at all CRs. Furthermore NOx emissions was affected much more than other exhaust emissions when changing the compression ratios compared to un leaded gasoline © 2018 The Authors. Published by Elsevier Ltd.
Peer-review under responsibility of the organizing committee of ICEER 2018

Nowadays, a lot of emphasis is placed on the car safety. It’s very difficult to ensure the highest possible body strength using conventional tests. The correct testing method is the basis for the safety of the car bodies. It is less expensive and time-consuming to apply deformation characteristics testing to selected types of steel than to produce a complete body and then test its deformation properties. The three-point bending test makes it possible to determine the absorption potential of the selected sheet metal. The purpose of this article is to evaluate innovation potential of the multiphase Trip steel, which is used in the automotive industry for the body-in-white structural components, and deformation elements mainly.

Complex structural steel structure projects must be realized with the aid of specialized logistical technologies to meet all the design technical specifications. Selecting which equipment to employ, particularly when we need to elevate heavy structural steel components at an elevation higher than 8 meters, requires not only experience and the use of standard techniques for the logistic management of construction processes but also requires stress capacity calculations of the constituent elements of the machines that we will use for the implementation of the project. An indispensable machine for the realization of steel structures is the telescopic forklift, which serves to lift steel elements at different heights and positions, for a relatively long time, to assemble structure elements such as columns, trusses, beams, automated cranes, etc. In this paper, we have designed a telescopic forklift and calculated the stress capacity of the structural elements that compound the telescopic-boom, using the finite element software (FEM) Solid Works. Carrying out simulations with the corresponding load that we have to deal with in the realization of the project, allows us to change the section thickness of the telescopic boom or to use other logistic equipment with a higher capacity.

Thin films deposited on glass substrates by sol-gel containing ZrO2 show photocatalytic activity, which are compared with TiO2 – which is used as a standard photocatalytic material applied in photovoltaics. By modifying ZrO2, coatings on glass surfaces were obtained, which are characterized by high properties, which are a prerequisite for use in photovoltaics. The coatings are dense and nanocrystal line according to SEM and XRD studies and optically transparent according to UV-VIS-NIR spectra

This study presented a sustainable construction material, wood-cement briquette, for construction indust. Wood-cement briquette has significant advantages as compared to the traditional cement briquettes such as lower carbon footprint, lower cost, easy production, environmental friendliness, sustainability. Wood-cement briquettes have a good thermal insulation and sound insulation than traditional briquettes. In addition to wood, other lignocellulosic materials such as hemp and flax can be also used in the producrion. Especially, it is a better material for buildings located in earthaqure -prone areas because the relatively elastic structrure of wood makes it a good material in regions prone to seismic activity. Wood-cement briquettes are suitable material for single or dublex buildings. It is estimated that its use will considerably increase in construction industry in near future. This study, characteristics of raw materials used in wood-cement briquette, the physical and mechanical properties and potential uses of wood-cement briquettes are given in this review study.

Environmental and economic problems caused by over dependence on fossil fuels have increased the demand and request for green energy produced by alternative renewable sources. Solar energy systems have emerged as a viable source of renewable energy over the past two or three decades, and are now widely used for a variety of industrial and domestic applications. Such systems are based on a solar collector, designed to collect the sun’s energy and to convert it into either electrical power or thermal energy. Solar energy is predictable to play a great role in the infrastructure as a distributed source, due to the fact that it is an easily available renewable source of energy. In Jordan, natural conditions for solar are excellent, with an intensity of direct solar radiation with 5 to 7 kWh/m². The main purpose of the present study to estimate the performance of a solar tracking photovoltaic (PV) panel of dual axis type, through designing, construction and testing of a solar tracking system which automatically searches the optimum PV panel position with respect to the sun by means of a DC motors controlled by Arduino Mega board that receives input signals from dedicated Light Dependent Resistor (LDR), and compare the results with fixed PV panel. The results showed that the use of the Dual-Axis Tracking System can produce about 37.37% gain of power output, compared with a fixed system inclined at 30° to the horizon.

Graphene oxide, owing to its unique physicochemical properties, has established itself as a versatile platform with applications ranging from drug delivery to medical imaging. The modification of graphene oxide has the potential to enhance crucial properties such as near-infrared (NIR) adsorption capacity, water dispersity, and cytotoxicity. This paper aims to discuss the potential of unmodified graphene oxide and polyethylene glycol (PEG)-modified graphene oxide nanoparticles as responsive systems to NIR in the context of combined photothermal and chemotherapy. The focus is on their application for treating colorectal and hepatocellular cancer cells, highlighting their promise in integrated cancer therapies.

Automating and delegating daily tasks is a growing trend. Digital devices and the Internet of Things have boosted this development. This has transformed machine-to-machine (M2M) communication, industrial production, and control solutions as well as smart homes and consumer devices. IoT infrastructure and device networking require scalable, secure, efficient, resilient, and widely supported application layer communication protocols. It is vital to note that IoT infrastructure development prioritizes service implementation and functionality. However, IT security vulnerabilities and system reinforcement are typically neglected. Our present research focuses on a black-box vulnerability evaluation during smart street lighting system development. The goal is to raise awareness of the importance of safety-conscious growth.

They have been conducted on ellipsometry and contact angles. The contact angles of a surface coating on glasses applied in photovoltaics were measured. This study used a DSA 100-Expert (Krüss GmbH, Germany) to measure contact angles on glass substrates. Contact angles were measured using the DSA 100-Expert tilt table accessory to identify both advancing and receding contact angles. A drop of deionized water is deposited on the glass substrate and then the table is tilted at a constant rate of 5 degrees per minute, to a tilt angle of 90 degrees.

Direct Metal Laser Sintering (DMLS) is a revolutionary technology that allows a production of fully functional metal parts directly from a 3D CAD data, eliminating the investment to production tools and technologies which brings considerable cost and time savings. Metal parts made by DMLS technology are fully comparable with casted or machined parts. A range of application of DMLS technologies is very wide – from prototypes, through short-run production to final products. Advantages of DMLS technology are arising along with complexity of parts – more complex geometry of parts (in terms of shape and occurrence of the detail) make DMLS technology even more economically effective.

The subject of this study is electrochemical and structural characterization of nano-dimenzioned composite electrode materials for hydrogen evolution consisted of Co, Pt or CoPt metallic phase and TiO2, both grafted on multiwalled carbon nanotubes (MWCNTs) as a support material. The main idea was to replace platinum entirely or to some extent as an electrode material. The electrode materials with different The common composition of the studied electrode materials was 10%Me + 18%TiO2 + MWCNTs, where Me = Pt, CoPt (1:1, wt.), CoPt (4:1, wt.) and Pt. The structural and surface changes, as well as their influence on electrocatalytic activity were analyzed by means of XRD, TEM, SEM and FTIR. It was found that Co considerably reduces Pt particle size, from 11 nm (in pure Pt metallic system) to 3–4 nm (in mixed CoPt systems). This is a reason for better activity of the electrode material with CoPt (1:1) metallic phase than that with pure Pt, while the CoPt (4:1) with very low quantity of Pt approaches the acitivity of the electrode material with pure Pt.