Low spatial frequencies of atmospheric turbulence are specially troublesome to astronomers because the phase distortions they cause have large amplitude. We have begun experiments at the Multiple Mirror Telescope (MMT) to remove these errors with tip, tilt, and piston control of pieces of the wave front defined by the telescope’s six 1.8 m primary mirrors. We show long exposure images taken at ...

A new instrument was developed to measure radon exposure with the use of passive monitors like nuclear track etch detectors. It is based on a device to be switched on and off to permit accurate measurements of timed exposures. The detector arrangement consists of a small cylindrical chamber, a mobile piston inside, a filter holder, a detector holder. The internal sampling volume is variable. Th...

The goal of this project is to provide a compact and efficient fluid power source for mobile applications (10 kW-500 kW), including on-road vehicles and off-road heavy machineries. This is achieved through the development of a hydraulic free-piston engine (HFPE). Previously, a virtual crankshaft mechanism is proposed by the authors which regulates the pistons to follow any reference trajectorie...

Abstract Storage trials of 4 and 8 months’ duration, using ‘Bartlett’ pear ( Pyrus communis ) fruit treated with without aminoethoxyvinylglycine (AVG) stored ultra low oxygen (ULO) storage (1.5 kPa O 2 versus dynamic controlled atmosphere (DCA) (≈ 0.6–0.7 based on chlorophyll fluorescence were conducted over years. AVG applied preharvest DCA produced pears significantly lower respiration, ethyl...

The HAMP domain is a linker region in prokaryotic sensor proteins and relays input signals to the transmitter domain and vice versa. Functional as a dimer, the structure of HAMP shows a parallel coiled-coil motif comprising four helices. To date, it is unclear how HAMP can relay signals from one domain to another, although several models exist. In this work, we use molecular simulation to test ...

In most gear drive applications mineral or synthetic oils are used as lubricants, which made of fossil raw materials and non-biodegradable. located in critical environmental areas such boats harbors, eco-friendly lubricants needed. As a result, transmission fluid based on water is currently being developed research project supported by the Bayrische Forschungsstiftung (Bavarian Research Foundat...

Introduction:Different types of prosthesis are available for stapes replacement. Because there has been no published report on the efficacy of the titanium soft-clip vs the fluoroplastic Causse loop Teflon piston, we compared short-term hearing results of both types of prosthesis in patients who underwent stapedotomy due to otosclerosis.Materials and Methods:A total of 57 ears were included in ...