In the application of a micro-/nano-mechanical resonator, the position of an accreted particle and the resonant frequencies are measured by two different physical systems. Detecting the particle position sometimes can be extremely difficult or even impossible, especially when the particle is as small as an atom or a molecule. Using the resonant frequencies to determine the mass and position of ...

Recently, the polymeric micro-fluidic biochip, often called LOC (lab-on-a-chip), has been focused as a cheap, rapid and simplified method to replace the existing biochemical laboratory works. It becomes possible to form miniaturized lab functionalities on a chip with the development of MEMS technologies. The micro-fluidic chips contain many micro-channels for the flow of sample and reagents, mi...

The glass polarization effects were introduced in this paper to study the main cause of turn-on drift phenomenon of closed-loop micro-accelerometers. The glass substrate underneath the sensitive silicon structure underwent a polarizing process when the DC bias voltage was applied. The slow polarizing process induced an additional electrostatic field to continually drag the movable mass block fr...

A new mass-conservative phase change model has been developed for the nucleate boiling simulation. The conservative CIP scheme is used for surface tracking in order to satisfy the mass conservation exactly. As the phase change model, a sharp-interface model is developed, in which the phase change rate can be computed from the heat flux to the interface in a straightforward manner. The developed...

This paper reports on the development of a microfluidic platform to study mass transport behaviour of blood cells at micro-scale stenosis where local strain-rate micro-gradients trigger platelet aggregation. We present the design, fabrication and blood testing of a microfluidic device that incorporates symmetric or asymmetric flow focusing using a single pressure driver to study the hemodynamic...

This study investigated the feasibility of the micro powder blasting technique for the micro fabrication of sensor structures using the Pyrex glass to replace the existing silicon-based acceleration sensor fabrication processes. As the preliminary experiments, the effects of the blasting pressure, the mass flow rate of abrasive and the number of nozzle scanning times on erosion depth of the Pyr...

This paper reports on an investigation of mass transport of blood cells at micro-scale stenosis where local strain-rate micro-gradients trigger platelet aggregation. Using a microfluidic flow focusing platform we investigate the blood flow streams that principally contribute to platelet aggregation under shear micro-gradient conditions. We demonstrate that relatively thin surface streams locate...

A hybrid ultramicroelectrode containing one micro-carbon electrode and one empty micro-channel was employed to be a micro-electrochemical cell and a mass spectrometric nanospray emitter. This setup can combine MS with an electrode directly and provide in situ information about an electrochemical reaction. The mechanisms proposed by Bard et al. for a Ru(bpy)32+ (bpy = 2,2'-bipyridine) electroche...

هدف: هدف از این مطالعه بررسی اثر سینامیک‌اسید (CA) بر برخی خصوصیات فیزیولوژیکی و میزان تحمل‌به‌شوری گیاه‌تنباکو (Nicotiana rustica L.) می‌باشد.مواد روش‌ها: در قطعات جداکشت گیاه تنباکو رشد‌یافته محیط MS به محیط‌های کشت حاوی (غلظت‌های 0، 5، 10 20 میلی‌گرم‌در‌لیتر) نمک NaCl 100 200 میلی‌مولار) منتقل‌گردید. پس چهار هفته فعالیت آنزیم فنیل‌آلانین‌آمونیالیاز (PAL) تیروزین‌آمونیالیاز (TAL) ، ترکیبات‌فن...