The development and application of new materials brings, in connection with their technological machining, a number of new questions. Classical methods of machining are supplemented by new technologies. An abrasive water jet represents a universal flexible tool enabling the machining of all natural and artificial materials that are not damaged by direct contact with water. Great attention is paid to the study of the cut surface topography after abrasive water jet machining. The study of surface topography is important from the point of view of modelling and prediction of the topographic function of the abrasive water jet. On the basis of knowledge of the topographic function, we are able to optimise the technological parameters of the abrasive water jet machining process, which has an impact on the output, quality and price of the final product. The mechanism to remove material is an area which has not received much attention. In material disintegration, the mechanisms of cutting, plastic deformation, fatigue and fracture participate physically. By studying the surface topography we can better understand the process of abrasive water jet machining, specify the theory and correctly quantify the mechanism of material removal, which is the subject of this paper.

Mines which are located on the ground have been threating not only military forces but also civilians. These threating mines are classified as wooden, plastic and metal types. In this study a detector, which is able to detect all the mines placed on the ground, has been developed. Detecting and destroying the mines on a suspicious area without personel have been possible with remote control devices. In our work we aimed to produce a GPS-based mobile prototype vehicle carrying a system which can jam electromagnetic waves to blow up the mines with a remote control. This vehicle runs on solar energy and it can be steered by simulation glasses.

The main purpose of electromagnetic interference (EMI) shielding coatings is the insulation of sensitive devices and protect people from electromagnetic field exposure due to its effects on the human body. This paper investigates the dielectric properties, and electromagnetic shielding performances of graphite and carbon black (CB) filled epoxy matrix composites produced by the mechanical mixing method. The sample compositions were created at rates ranging from 1 to 7 wt%. Samples were analyzed by Vector Network Analyzer (VNA) using the coaxial method in the range of 1–14 GHz, including L band, S band, C band, X band and partially Ku band. After determining the scattering parameters with VNA, AC conductivity, absorption, reflection and total shielding efficiency values were calculated. At high frequencies, almost all the samples showed higher AC conductivity. CB-filled samples show higher AC conductivity than graphite-filled samples. The total shielding efficiency (SET) of the graphite-added samples (19–21 dB) is slightly higher than the carbon black-added samples (8–17 dB). Distinct filling ratios in graphite-added samples result in closer shielding behavior in contrast to carbon black-added samples. However, higher shielding efficiency is observed as the CB filler ratio increases. The shielding efficiencies of the samples with both types of filling materials vary little depending on the frequency. Reflection is the main mechanism of the shielding efficiency, which constitutes the majority of total efficiency for all types of samples.

Tü rkiye'de, Makine ve Teçhizatı Hariç Fabrikasyon Metal Ü rü nleri İ malatı en çok iş kazasının yaşandığ ı sekto rdü r. Bü çalışmada Sosyal Gü venlik Kürümü'ndan alınan verilerle ü lkemizde Makine ve Teçhizatı Hariç Fabrikasyon Metal Ü rü nleri İ malatı sekto rü nde yaşanan iş kazası sayıları incelenmiştir. Makine ve Teçhizatı Hariç Fabrikasyon Metal Ü rü nleri İ malatı sekto rü nde 2008-2015 yıllarına ait veriler küllanılarak henü z verileri açıklanmamış olan 2016 yılına ait iş kazası ve o lü mlü iş kazası sayılarının tahmin edilmesi amaçlanmıştır. Tahmin yo ntemi olarak Üyarlanabilir Bülanık Zaman Serisi ve En Kü çü k Kareler yo ntemleri küllanılmıştır. Yapılan tahmin neticesinde 2016 yılına dair açıklanacak kaza verileriyle hanği yo ntemin daha sağ lıklı tahminde bülündüğ ü ortaya çıkacaktır.

This study aimed to develop a software to enable recognition of moving objects and detection of their orbits by processing the images obtained through a camera. The secondary objective was to design a GPS-based mobile robot which tracks moving objects.