Vertical Forced Vibration of a Rigid Disk in a Transversely Isotropic Full-Space

, M.Sc. Thesis Sharif University of Technology Hassani. Arash (Author) ; Eskandari, Morteza (Supervisor) ; Mohammadi Shodja, Hossein (Co-Advisor)

Abstract

This research is concerned with the investigation of forced time–harmonic vertical vibration of a rigid disk embedded in a transversely isotropic full space medium. By properties of integral transform methods, the generalized mixed boundary–value problem is formulated as a set of dual integral equations, which in turn, are reduced to a Fredholm equation of the second kind. The obtained Fredholm integral equation is solved by well-known numerical methods. Selected results for the load distribution on the disk and complex compliance are presented for various ranges of frequency.

Numerical Simulation of Micro channel for Cells Counting Based on the Impedance Measurement of Cell Lysate

, M.Sc. Thesis Sharif University of Technology Khademi, Maryam (Author) ; Saidi, Mohammad Said (Supervisor) ; Sani, Mahdi ($item.subfieldsMap.e)

Abstract

Nowadays cell-based microfluidic devices have many applications. One of the applications is disease diagnosis according to number of cells. Cell counting has different methods, such as optical cell counting, flow cytometry, hemocytometry, coulter counters,and so on. One of the methods of cells counting is based on measurement of changes in impedance or conductivity of surrounding medium because ions are released from surface-immobilized cells inside a micr of luidic channel.The method of cell lysate impedance spectroscopy is sensitive enough and it was offered for detecting and enumerating CD4+ cells in HIV patients. In this study,...

Designing Electrophysiological Characterization System of Biological Cells Based on the Use of Nanostructured Electrodes

, Ph.D. Dissertation Sharif University of Technology Vafaiee, Mohadeseh (Author) ; Vossoughi, Manouchehr (Supervisor) ; Sasanpour, Pezhman (Supervisor) ; Mohammadpour, Raheleh (Supervisor)

Abstract

In the last half century, the recording of the electrophysiological activities of the neurons has been one of the most effective methods for neuroscience development. One of the techniques used to record the activity of the nerve cells is the use of multi-electrode arrays (MEAs). Current MEAs still face limitations such as low signal-to-noise ratio (SNR) and low spatial resolution. There is a need to develop arrays that are smaller in size and have less impedance to achieve better spatial resolution and lower noise levels. The main focus of this research is on the designing and fabrication of multi-electrode arrays and improvement of their properties using nanostructures and conductive...