This thesis focuses on dust accumulation in, and removal from, recently installed supply air ducts and on the bristle behaviour of rotating duct cleaning brushes. The results of dust accumulation, measured using three different methods, were compared and the amount of dust in newly installed air ducts was evaluated. The vacuum test was found to be an efficient method of collecting dust samples ...

background: along with the prospers of scientific production there is a need for measuring and evaluation of university’ s scientific productions by means of accepted international indices to make comparison between academic institutions. this study aims to evaluate the scientific production of faculty members affiliated to shahid beheshti university of medical sciences (sbmus) in web of scienc...

Computed tomography detected the presence of dilated ducts in 15 of 18 cases with extrahepatic obstructive jaundice and demonstrated the obstructing lesion in 18 out of 25. The cause of the obstruction was detected in the absence of duct dilatation, and calculi which were radiolucent on conventional radiographs were demonstrated. Ulstrasound detected dilated ducts in eight of 10 cases, but demo...

In this paper, signal enhancement due to the ducts over a sea surface is experimentally investigated and modeled. The investigation is carried out through the study of air-to-ground mobile microwave links over a tropical ocean with low airborne altitudes (0.37 – 1.83 km) at C band (5.7 GHz). The distance-dependence of the ducting induced enhancement (with reference to the free-space propagation...

Many accessory lacrimal glands can be found along the inner surface of the eyelids. A variable number of thin-walled excretory ducts, blood vessels, lymphatics, and nerves pass from the main orbital gland into these accessory lacrimal glands. The ducts continue downward, and about 12 of them empty into the conjunctival fornix approximately 5 mm above the superior margin of the upper tarsus. Bec...

Using CFD, the paper deals with a simulation of all phenomena related to forced-air duct fitted fan, emphasis on unit aerodynamic resistance and untight air ducts. We created 3-dimentional model system including perforations simulating untightens in order make computation network. Boundary conditions were set calculations made ANSYS Fluent 19.1 programme. The computational results assessed usin...

Plenum chambers are common devices used for flow and pressure equalization in ventilation air conditioning systems. Aiming reducing energy consumption improving performance, the optimal cross-sectional aspect ratio ( W/H ) length L of single-path unlined rectangular plenum chamber is obtained through authors’ preliminary research. In this study, based on analysis interior characteristics chambe...

Non-traumatic perforations of the bile ducts are unfrequently encountered entities, all the more when they affect the intrahepatic bile ducts, exteriorizing their biliary content in the great peritoneal cavity. Reporting such a case has determined the authors to perform a careful overview of the cases present in the literature. An observation that can be made based on these is that the obstruct...

This article mainly studies the improvement of properties 1Cr18Ni9Ti material after laser shock peening. The is main used to make aviation ducts, and improving fatigue life ducts can significantly improve safety performance engines. combines simulation experiment study effect peening on material’s properties. results are as follows: test showed that, under same stress load, greatly extend speci...

In terms of multifarious technical applications, various kinds passive methods are preferred to the active techniques when it comes increase amount convection heat transfer via less energy consumption. As a vortex generator within scope method, rib is usually employed induce enhancement. this study, rectangular cross-sectional ribs have been placed for staggered arrangement between horizontal p...