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A finite element model for evaluating the performance of the MEMS air flow sensor with sapphire as substrate was established. The temperature distribution of the MEMS sensor chip with respect to different air flow was calculated by COMSOL Multiphysics. The trenches etched in the substrate were used to reduce the heat transfer from the heater to the temperature measuring thermistors within the substrate...
Previous works investigated particle trajectories in hard disk drives (HDDs) with the actuator arm and the head gimbals assembly at a fixed position. Actually, internal fluid field characteristics of HDDs can be greatly changed by the arm swing during track-seeking operations, which can affect particle trajectories and trapping status. In this paper, using the dynamic mesh method in a 2.5 in HDD for...
The semi-physical simulation test method is the research focus of electronic warfare equipment performance evaluation test in complex electromagnetic environment. The complex electromagnetic environment signal generation technology based on digital geographic information is an effective technical approach to implement semi-physical simulation test. In this paper, the idea, method and current development...
In this paper, simulation model for the response time of micro flow sensor using COMSOL Multiphysics is presented. The detailed structure of the micro flow sensor chip is considered in the simulation model. What's more, the temperature dependencies of physical properties of air are defined to improve the model precision. The model takes into consideration the transient conduction and convection between...
The process of dispensing gel above the silicon chip aimed at protecting chip surface and bonding wire is one of the most critical steps in the production of highly accurate low-pressure sensor modules. Numerous research efforts focused on the influences of dispensing process parameters, configuration and mechanical behavior of cured gel on the performance of sensors, while few concerns were taken...
The paper presents an analysis of self-heating effect on micro-machined temperature difference air flow sensor, and demonstrates through modeling and simulation that self-heating effect can influence the output of the air flow sensor. The mathematical model of the sensor based on an existing microsensor chip is set up, and some details of the chip structure are considered in the model. The sensor's...
In this paper, simulation and optimization of a micro flow sensor is presented. Modeling of the micro flow sensor using ANSYS Fluent for temperature distribution is studied. The detailed structure of the micro flow sensor chip is considered in the simulation model. What's more, the temperature dependencies of physical properties of air are defined to improve the model precision. As a key parameter,...
The paper presents an analysis of self-heating effect on micro-machined temperature difference air flow sensor, and demonstrates through modeling and simulation that self-heating effect can influence the output of the air flow sensor. The mathematical model of the sensor based on an existing microsensor chip is set up, and some details of the chip structure are considered in the model. The sensor's...
In this paper, simulation model for the response time of micro flow sensor using COMSOL Multiphysics is presented. The detailed structure of the micro flow sensor chip is considered in the simulation model. What's more, the temperature dependencies of physical properties of air are defined to improve the model precision. The model takes into consideration the transient conduction and convection between...
The process of dispensing gel above the silicon chip aimed at protecting chip surface and bonding wire is one of the most critical steps in the production of highly accurate low-pressure sensor modules. Numerous research efforts focused on the influences of dispensing process parameters, configuration and mechanical behavior of cured gel on the performance of sensors, while few concerns were taken...
We have developed a novel MOCVD reactor, which is called buffered distributed spray (BDS) MOCVD reactor, for the multiple wafer growth of films of III–V materials. In the present study, a fundamental and multi-field model based on the computational fluid dynamic (CFD) simulation of coupled flow, heat and mass transfer is presented to describe the epitaxial growth of gallium nitride (GaN). It is investigated...
When one-dimensional single atom chain was placed at the center of single wall carbon nano-tube (SWCNT) along the axis, and using the molecular dynamics simulation, the mechanical strength of a single-walled could be obtained in terms of the stress-strain curve. At this temperature of 0K, the ultimate stress of a SWCNT with one-dimensional single atom chain was higher than that of a SWCNT without...
Er Lang Shan tunnel is the most absolute altitude highway tunnel in china, which was firstly used the semi-transverse ventilation system, is characteristic of extensive length, higher absolute altitude, multivariate climate and complex wind stream. Based on one-dimensional fluid mathematic models, the characteristics of distribution of wind field were simulated under diversity conditions such as fans,...
Function-Structure Plant models (FSPM) seem attractive to better understand the complex interactions between plant growth, canopy morphogenesis, and epidemics. Epidemics are driven by climate factors and among them, temperature is known to play a major role. Thus, weather station measurement is commonly used to drive epidemics models. However, the relationship between climate and within-canopy microclimate...
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