the zagros fold-and-thrust belt is tectonically active and often has active faults with insensible and slow motions. determining the rate of movement and displacement in these faults requires very precise measurements. one of the measurement methods of fault movements is using geodetic and micro-geodetic studies. this research is focused on one of the active faults in the north of shiraz city, ...

This paper describes work on early detection of space launch vehicle failures that could lead to loss of control during ascent. The particular focus is on the Solid Rocket Motor (SRM) comprising First Stage of the Crew Launch Vehicle (CLV). Some of the most important failure modes leading to loss of vehicle control are caused by hot gases ejected from the SRM combustion chamber through a case b...

Permanent magnet linear synchronous motor (PMLSM), which has the advantages of simple structure, small volume, high force, is a research focus and difficulties because of the thrust ripple and control problems for PMLSM. In this paper, in order to reduce thrust ripple and improve system control performance, the space voltage vector pulse width modulation technology (SVPWM) was introduced into t...

Abstract The paper presents technological, experimental and numerical studies aimed at the development of a morphing nozzle in composite material with deformable divergent section, which is designed to control vector thrust rockets without using mechanisms or localized flexible joints. design characterized by corrugated walls longitudinal elements that make possible separation load paths involv...

Abstract To foster the competitiveness of European industry in global launcher market, need arose to build up necessary know-how on state-of-the-art vertical take-off landing (VTVL) concepts and corresponding technologies. In EU Horizon 2020 project RETALT (RETro propulsion Assisted Landing Technologies), VTVL approach applying retro is investigated for two-stage-to-orbit (TSTO) single-stage-to...

abstract background and purpose:vector-borne diseases such as malaria and leishmaniasis are still a public health problem in iran. one of the effective ways to prevent of these diseases is to improve the vector control program. we carried out this study for assessment managers of school knowledge, attitude and practice regarding vector control programs. materials and methods:a cross-sectional s...