• Experimental verification of the surface wettability of welds with modified topography by contact angle measurement techniques

    pg(s) 21-24

    Paper presents experimental work focused on the application of the separating agent-lubricant SafetyLube 7815 on the surface of the tested samples: ground surface; polished surface; surface of the samples textured by laser in the mode stochastic texture mode. Duplex PVD coatings nACRo4, AlXN3 and AlTiN G were deposited on the surface. The aim of the experimental work was to approximate the breakin conditions of a new or renovated mould part for high pressure casting of aluminium alloys. The release agent-lubricant SafetyLube 7815 was applied to the surface of the specimens by dispersive spraying. The method of measuring the contact contact angle measurement, the influence of the finishing operations of the mould part surface on the surface wettability by contact angle measurement.

  • Reducing GHG emissions using wind-assisted ship’s propulsion

    pg(s) 17-20

    International trade is still heavily reliant on oceangoing vessels and the noxious bunker fuel that feeds most ships’ massive diesel engines. Although shipping contributes relatively small shares of GHG emissions per unit of transport work, without further action, emissions from the sector would continue to increase. Therefore the maritime community and ship-owning companies are attempting to achieve “green shipping”. The revolutionary technology to use the wind for assisting the ship’ propulsion is one of best steps for decarbonisation of shipping. This innovative technology could bring considerable reducing fuel consumption and cost savings, improving the ships efficiency as well. There are different ways to utilize the wind power, as several kinds of rotors, sails, kites, etc, some of them already installed on commercial ships, some are still dreams. The aim of this paper is to present the basic essence of wind-assisted propulsion and the environmental impact of its use.

  • Surface texturing by femtosecond laser of hierarchical porous freeze foam structures for orthopedic applications

    pg(s) 14-16

    The main challenge in the design of tissue substitutes is still the realization of a customized implant with good interface properties without any risk of subsequent inflammation. The application of laser bases methods to development of constructs with improved biomimetic properties is an excellent strategy owing to the possibility of fabricating complex scaffolds with hybrid porosities. The micro/nano porosity is an important condition for cell viability and tissue ingrowth. An interconnected pore structure will permit inwards diffusion of oxygen and nutrients and outwards diffusion of waste products from the scaffold. Ceramic materials are difficult to process due to their brittleness and chemical inertness, but they can be patterned by high energy ultrafast laser radiation, generating specific isotropic and anisotropic micro/nano topographies. The aim of this study is to be able to develop functional, porous biomaterials surface with improved porosity, biocompatibility, biodegradation rate and multifunctionality by employing Freeze Foaming/Hybrid Shaping technology and high precision ultra-short laser processing method. An important advantage of this approach is that the mechanical properties of treated surfaces remain the same after the treatment, which modifies roughness and hydrophilicity and therefore affects the response of cells and bacteria.

  • Application of gamma irradiation for decomposition of ochratoxin a, zearalenone and deoxynivalenol in wheat flour

    pg(s) 10-13

    The paper presents the applicability of gamma irradiation for the degradation of mycotoxins ochratoxin A, zearalenone and deoxynivalenol in wheat flour. The experiment was carried out by contamination of wheat flour samples with mixture of the mycotoxins and their gamma irradiaton with doses of 5 kGy, 10 kGy and 20 kGy using industrial gamma irradiation facility BULGAMMA. The concentrations of the mycotoxins before and after the radiation processing were measured by HPLC. The results showed that the application of a dose of 10 kGy resulted in incomplete decomposition of the investigated mycotoxins: 12 % of deoxynivalenol, 13 % of ochratoxin A and 37 % of zearalenone. The decomposition of the investigated mycotoxins in wheat flour achieved after gamma irradiation with a dose of 20 kGy was found to increase in the following order: ochratoxin A (48 %) > zearalenone (66 %) > deoxynivalenol (97 %).

  • 2D semiconductive nanomaterials for sensor application

    pg(s) 6-9

    This paper presents an investigation of innovative nanostructured semiconductive materials, focusing on dichalcogenides of transition metals, particularly WS2. The properties of WS2 in the context of its application in sensor technology and highlight the anticipated advantages of nanostructured disulfides compared to bulk semiconductor materials are discussed in the introduction. We propose a model sensor element based on the nanostructured disulfide WS2 and introduce a technological method utilizing electron beam lithography (EBL) for its preparation. The paper details the processes involved in preparing the resist masking layer using EBL, the metallization of the interdigital electrode (IDE) with contacts and important EBL characteristics such as a contrast curve, dependence of the linewidth on the exposure dose, and the line edge roughness.

  • Review of the chemical and active compounds of the lyophilized essential oli of Thymus vulgaris L. with special reference ot the preservation of the quality of the finished product

    pg(s) 413-418

    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.

  • Influence of variable compression ratio on emissions of a single cylinder- 4 stroke engine fueled with/etanol/gasoline blends

    pg(s) 410-412

    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

  • The assessment of Trip steel innovation potential when used for the deformation zone’s parts

    pg(s) 406-409

    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.

  • Calculation of telescopic-boom bending stress capacity using fem software, in support of project logistics decisions

    pg(s) 401-405

    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.

  • Effect of zirconium dioxide on the obtaining of layers synthesized by zol-gel technology for photovoltaic applications

    pg(s) 398-400

    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

  • Environmentally Friendly Material Used in Building Construction: Wood-Cement Briquette for Earthquake Zones

    pg(s) 395-397

    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.

  • Design a tracking system for optimum solar energy

    pg(s) 388-394

    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.