introduction: the aim of this study was to evaluate and compare microhybride composite treated by bur and different power of erbium, chromium doped yttrium scandium gallium garnet (er,cr:ysgg) laser by scanning electron microscope (sem). methods: 21 microhybride composite blocks (diafil tm, diadent, korea) with 2 × 4 × 4 mm dimensions were made. the bonding surface of these blocks were polished...

The results of direct thrust measurements the thruster with multiple vectoring capability utilizing Kr are presented. is a 2U size system. tested bi-directional plasma consists head, inbuilt rf generator creating 9 MHz current applied to antenna, power supply for set electromagnets, and control head open-ended gas discharge chamber, antenna. During measurements, magnitude configuration external...

Received Mar 17, 2017 Revised Sep 8, 2017 Accepted Sep 20, 2017 Delay locked loop is a critical building block of high speed synchronous circuits. An improved architecture of amixed signaldelay locked loop (DLL) is presented here. In this DLL, delay cell based on single ended differential pair configuration is used for voltage controlled delay line (VCDL) implementation. This delay cell provide...

A single vacuum tube based solar cooker has high energy and exergy efficiency, and is capable of achieving cooking temperatures as high as 250 C. The reason for high energy and exergy efficiencies of this solar cooker is the high achievable concentration ratios of 15e20, which are not possible with multiple vacuum tube based solar cookers. In this paper, a comparative study has been carried out...

Two types of air-cooled modular polymer membrane fuel cells (PEMFC) stacks with full equipment were constructed and investigated as components hybrid power sources. The first, a 2-kW PEMFC stack, was assembled from two 1-kW modules electrically connected in parallel compared commercial stack built one module. second, 500-W three parallel. It found that the two-module capable operation nominal 2...

Taking as inspiration the hybrid logic HL(↓), we introduce a new family of logics that we call memory logics. In this article we present in detail two interesting members of this family defining their formal syntax and semantics. We then introduce a proper notion of bisimulation and investigate their expressive power (in comparison with modal and hybrid logics). We will prove that in terms of e...

A critical issue in determining whether or not the anomalous effects that occur during D2O electrolysis are of nuclear origin is the measurement of nuclear products in amounts sufficient to explain the rate of excess enthalpy generation. Calorimetric evidence of excess power up to 27% was measured during the electrolysis of heavy water using palladium cathodes. Maximum excess power was 0.52 W (...