نتایج جستجو برای: میکروفون خازنی mems
تعداد نتایج: 9672 فیلتر نتایج به سال:
AIM We tested the hypothesis that administrations of methanolic extracts of Musa sapientum sucker (MEMS) with exercises attenuated hyperglycemia in alloxan-diabetic rats. MATERIALS AND METHODS A total of 40 adult male rats were divided into equal eight groups. Normoglycemic Group A was Control. Alloxan (180 mg/kg, i.p.) was administered to rats in Groups B - H to induce diabetes. Group B (dia...
Most MEMS devices are currently based on silicon because of the available surface machining technology. However, Si has poor mechanical and tribological properties which makes it difficult to produce high performance Si based MEMS devices that could work reliably, particularly in harsh environments; diamond, as a superhard material with high mechanical strength, exceptional chemical inertness, ...
محاسبه مقاومت زمین هادیها ویا ظرفیت خازنی آنها در فضا از دیرباز مورد مداقه قرار گرفته است. اولین روش محاسبه ظرفیت خازنی اجسام توسط : G.W.O.HOWE بسال 1914 ارائه گردید. نامبرده توزیع بار را در طول الکترود یکنواخت فرض کرده وبا محاسبه پتانسیل میانگین ، بمعادله ظرفیت خازنی دست یافت .گرچه فرضیه اخیر نادرست بود ولی بخاطر تقریب قابل قبول فرمولهای بدست آمده ، روش پیشنهادی وی شهرت جهانی یافت . از آن پ...
در این مقاله، طراحی و شبیهسازی نانوحسگر شتابسنج ترکیبی پیزوالکتریک خازنی-مقاومتی با استفاده از نرمافزار مالتیفیزیک Comsol مورد بررسی قرار گرفتهاست. معادله حاکم بر خیز نانوحسگر یکسر درگیر با در نظر گرفتن نیروهای الکترواستاتیک و واندروالس-کازیمیر ارائه شدهاست. اثر در نظر گرفتن لایه پیزوالکتریک، پیزومقاومت و صفحه خازنی در رفتار خمشی نانوحسگر با اعمال ویژگیهای فیزیکی لایهها به کمک واسطه...
Microelectromechanical Systems (MEMS) have gained acceptance as viable products for many commercial and government applications. MEMS are currently being used as displays for digital projection systems, sensors for airbag deployment systems, inkjet print head systems, and optical routers. This paper will discuss current and future MEMS applications.
In this study, we describe the operation of piezoelectric energy converters and electromechanical modeling harvesting (PEH) devices based on microelectromechanical systems (MEMS) for low-power sensors. Consideration is given to a harvester standard MEMS. The parameters are determined optimized using simple MEMS cantilever model. On top Brass substrate, model uses single layer material. We utili...
Power supply for electronics is one of the more recent application areas which has been explored for MEMS devices and techniques. Within this field, the most actively researched application has been MEMS power sources, particularly to replace batteries for portable electronic devices such as wireless sensor nodes. In addition, there are possibilities for MEMS devices in circuit protection, and ...
This paper presents a hybrid prognostics approach for Micro Electro Mechanical Systems (MEMS). This approach relies on two phases: an offline phase for the MEMS and its degradation modeling, and an online phase where the obtained degradation model is used with the available data for prognostics. In the online phase, the particle filter algorithm is used to perform online parameters estimation o...
An optimal layout synthesis methodology for CMOS MEMS accelerometers is presented. It consists of a parametrized layout generator that optimizes design objectives while meeting functional specifications. The behavior of the device is estimated using lumped parameter analytical equations. The design problem is then formulated into a non-linear constrained optimization problem. Such an approach t...
Failure is one key problem of MEMS S&A (safety and arming) device for its practical application. To make research of failure of MEMS S&A device in action process, a method based on FTA was employed to make analysis on arming process of the set-back arming mechanism of typical MEMS S&A device. Result obtained with theory computation was verified to be right by simulation analysis and which could...
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