Recently, the issue of machine condition monitoring and fault diagnosis as a part of maintenance system became global due to the potential advantages to be gained from reduced maintenance costs, improved productivity and increased machine availability. The aim of this work is to investigate the effectiveness of a new fault diagnosis method based on power spectral density (PSD) of vibration sign...

Preface Variational methods have become more and more important in image processing during the last years. They offer an intuitive way to understand the noise removal and image restoration process as minimisation of an energy functional. This energy functional provides the opportunity to compare the quality of two filtered versions of the same input image and thus can be seen as a quality measu...

Mohamadreza Guity1, MD; Kaveh Bashti2, MD; Arash Sharafatvaziri*3, MD 1. Department of Orthopetic Surgery, Tehran University of Medical Science, Tehran, Iran 2. Department of Orthopetic Surgery; Shiraz University of Medical Science, Shiraz, Iran 3. Division of Orthopetic Surgery, Khatamol Anbiya Hospital, Tehran, Iran Received: Apr 04, 2012; Accepted: Oct 11, 2012; First Online Available: Jan 0...

iranian journal of engineering education vol.12 no.47 autumn 2010   proprietor: the academy of sciences of ir iran, department of engineering science   executive manager: prof. mahmood yaghoubi   editor-in-chief: prof. parviz davami   editorial board:   prof. hadi nadimi   shahid beheshti university   prof. daryosh safvat   university of tehran   prof. morteza sohrabi   amirkabir university of ...

concinciding of wheat growth in post-anthesis period by water deficiency can result in reduction of current photosynthesis. in this circumstance stem-stored carbohydrate from pre-anthesis period had an important role in supporting assimilates for growing grain. an experiment was conducted in 2007-8 in experimental farm of arsanjan islamic azad university, in order to investigation the quantity ...

The action of salicylic acid (SA) has been well investigated in plant resistance against pathogen attacks but its role may be extended to a more global anti-stress plant cell strategy. The expression of defense-related functions may be also enhanced by elevated hexose levels. To verify if there exists a relation between these two defense programs, SA effect on soluble acid invertase (EC 3.2.1.2...

The distributions of the angular transmission coefficient and of the total transmission are calculated for multiple scattered waves. The calculation is based on a mapping to the distribution of eigenvalues of the transmission matrix. The distributions depend on the profile of the incoming beam. The distribution function of the angular transmission has a stretched exponential decay. The total-tr...

Peer-to-Peer (P2P) live media streaming is an emerging technology that reduces the barrier to stream live events over the Internet. However, providing a high quality media stream using P2P overlay networks is challenging and gives raise to a number of issues: (i) how to guarantee quality of the service (QoS) in the presence of dynamism, (ii) how to incentivize nodes to participate in media dist...

If you are a medicinal chemist casting your net for new drugs, you have a choice: you can take a bottom-up approach, in which you begin with a molecule that hits a known molecular target and hope it translates eventually into a physiological effect; or you can take a top-down approach, in which you begin with a molecule that causes the desired physiological effect and then find the molecular ta...