Current issue

J.Phys.Tech. vol1-1 2017

 

Contents
On the geodesics in Bondi-Gold-Hoyle universe model……………………………………………………….. 3
Plamena I. Marcheva and Stoil I. Ivanov

Engineering Optimization of a Robot with Six Legs …………………………………………………………… 6
Georgy Elenchev, Veselin Pavlov, Ivan Chavdarov

Modeling An In-Pipe Inspection Robot ……………………………………………………………………………. 12
Pancho Dachkinov, Ivan Chavdarov, Veselin Pavlov

Ionospheric anomalies over Bulgaria during geomagnetic storms and their impact on some communications…………………………………………………………………………………………………………………… 18
R. Bojilova

System for automated downloading of geomagnetic data from …………………………………………. 23
R. Bojilova, N. Kilifarska

Studying the Spatial Evolution of a Fractal Set of Points; Application on the 1983 Kefalonia Aftershock Sequence, Greece…………………………………………………………………………………………………………………… 29
D. Gospodinov, D. Stoychev, B. Ranguelov

Sensitivity of the Microseismic Sounding Method related to the Depth Structure Research in Two Different Seismic Zones – Vrancea and Calabria …………………………………… ……………………………. 33
E.Oynakov, B.Rangelov

Influence of Power Density on Laser Drilling of Bronze Samples CuSn10Zn2 …………………….. 39
Nikolay Angelov, Georgy Stoyanov

Frequency Dependence of Temperature for Laser Marking on Bronze Samples CuAℓ9Mn2………………………………………………………………………………………………………………………………. 44
Nikolay Angelov, Georgy Stoyanov

Influence of Speed on Laser Marking of Bronze Samples CuSn10Zn2………………………………… 49
Nikolay Angelov, Georgy Stoyanov

Numerical experiments for the influence of marking speed on the process of steel C22 laser marking……………………………………………………………………………………………………………………………….. 53
Nikolay Angelov, Yordan Penev and Aleksandra Marinova

Testing Equipment CA-1 for Illustrating the Performance of Diesel ICE Automobile with Front Drive Wheels…………………………………………………………………………………………………………………………………… 58
Nikola Dechevski, Ismail Cinev, Slavcho Bozhkov, Penko Bozhkov and G. Staneva

Testing Equipment SZU-1 for Illustrating the Performance of Automotive Ignition Systems………………………………………………………………………………………………………………………………. 63
Samir Hodzov, Evgeni Kostov, Slavcho Bozhkov and Penko Bozhkov

Factors Influencing Climate Change – a Brief Review ……………………………………………………… 67
Tsvetelina Velichkova, Natalya Kilifarska

An Affordable Stroboscopic Imaging Technique For Studying Liquid Droplet Shape Oscillations ……………………………………………………………………………………………………………………………………………… 75
Alexander Pimpas, Pavlin Tsonev, Andreana Andreeva, and Nikolay Zografov

Modulation Characteristics Measurements of Polymer-Dispersed Liquid Crystals Exposed to Light with Different Wavelengths ………………………………………………………………………………………………………….. 81
N. Bozhinov, D. Karashanova, V. Marinova