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The investigation in this paper involves Final Element Analysis (FEA) of piezoresistive accelerometer designs. Three different configurations of MEMS based accelerometer has been made and analysed using COMSOL Multiphysics. The designs presented in this paper consist of a square shaped proof mass with flexures supporting it. Different position and varied number of supporting flexures attached to the...
As part of the collaborative research centre 653 (CRC 653) at the Leibniz University of Hannover, sensors and sensitive materials are being developed which can be integrated into components and register the component condition directly. The part-project "Component status driven maintenance" presented here, develops the methodical procedure for being able to use these sensors in preventive...
This paper discusses the accessibility of nano-crossbar arrays of resistive switching devices, using both analytical approaches and statistical simulations. Voltage configurations of the wordlines and bitlines in crossbar arrays play a critical role on sensing margin, disturbance, and power efficiency. Access resistance to the array affects the actual line voltage and degrades the sensing margin....
In the future power grid, equipment will need to work with distributed generation, deregulation, and accelerating ageing factors. For smart operation without degrading the reliability of the system, there is a need to make a turn with diagnostics towards condition monitoring systems, which assess the actual performance of individual equipment. However, the emerging technologies for sensors specifically...
Based on the basic theories of constructivism and the prominent advantages of the multimodal cognition, we propose a new teaching model of college English writing-multimodal teaching model. In the multimodal teaching process, the four language learning approaches, namely, listening, speaking, reading and writing are applied to activate various senses of students, bringing the superiority of multimodal...
It could be very important and useful to enable human stress to be estimated on basis of quantitative values via objective analysis. There have been several approaches to estimate the stress so far. Most of them need a lot of time to measure or calculate it, and what is more, they might cause physical or mental burden for human subjects. The purpose of our study is to propose and develop a method...
Presented is a novel silicon piezoresistive double-clamped beam with nano-thickness. It senses double-side surface-stress induced by molecular self-assembly or specific bio/chemical reaction. For the first time, both theoretical analysis and experiments results indicate that, when the thickness is down-scaled into nano-scale, the sensitivity of the clamped-beam piezoresistive self-sensing beam will...
This paper presents lateral silicon bulk acoustic resonators that are piezoelectrically excited using a thin layer of AlN on their vertical sidewalls. Sputtered AlN coats the sidewalls of a 20 um thick resonator conformally and uniformly, enabling the excitation of width-extensional modes in a suspended silicon microstructure using the longitudinal piezoelectric stress coefficient e33. A motional...
In this paper, we develop a context recognition system that is based on multimodal biometric signals and applicable to smart driving system. The context recognition system includes a biometric analysis module that analyzes and recognizes human biometric signal patterns. The context recognition system can recognize a user's emotion and level of concentration by analyzing ECG (electrocardiogram) and...
Poor posture or extra stress on the spine has been shown to lead to a variety of spinal disorders including chronic back pain, and to incur numerous health costs to society. For this reason, workplace ergonomics is rapidly becoming indispensable in all major corporations. Making the individual continuously aware of poor posture may reduce out-of-posture tendencies and encourage healthy spinal habits...
More and more, daily stress is making place in our life. Lack of physical activity, lack of psychical and mental relaxation is lowering our resistance to the stimuli, perturbing our internal harmony and can be a cause for serious diseases. As response, our body reflects the stress as different physiological changes, which can be measured and monitored. One of the changes that appears is in Pulse Wave...
This work presents a fully-functional, microfabricated electrochemical-cantilever hybrid platform with flow control. A new cantilever chip format is designed, fabricated, and mounted in a custom polymer flow cell. Issues such as leakage and optical/electrical access are addressed, and combined mechanical and electrochemical performance is investigated. Lastly, a cantilever is “defunctionalized” in...
According to the statistics, roof and side fall accidents often occur and jeopardize greatly in coal mines. The variation of the strain and stress in the surrounding rocks of the mine roadway can predict the accident. How to obtain the strain and stress is the key point of the prediction. This paper provides a method on the case. Firstly the principle of monitoring stress in surrounding rocks of mine...
Detection of the Line-of-Sight (LOS) has a variety of applications, such as communication tools for elderly or disabled people and assisting drivers. To realize such promising applications, there is strong demand for a LOS detection system that does not restrict users' activities and inflicts no mental stress. In this paper, we propose a novel wearable LOS detection system, featuring minimum disturbance...
Repeated exposures to psychological stress can lead to or worsen diseases of slow accumulation such as heart diseases and cancer. The main challenge in addressing the growing epidemic of stress is a lack of robust methods to measure a person's exposure to stress in the natural environment. Periodic self-reports collect only subjective aspects, often miss stress episodes, and impose significant burden...
This paper presents a new high sensitive micromechanical silicon cantilever beam with a u-shape integrated strain gauge on its surface for optimizing piezo resistive read out. To improve the sensitivity of micro cantilever sensors, this study analyses and compares the deflection, vibration characteristics and maximum stress of rectangular and trapezoidal profile micro cantilevers. Therefore a new...
The dynamics of a uniaxial micro-accelerometer subjected to accidental drop events is studied by means of a reduced order model. A two degrees of freedom model is built, which carefully reproduces the MEMS response under high acceleration events. The results of the reduced order model are compared to those obtained with a three-dimensional finite element model, in terms of accuracy of the results...
Post-Traumatic Stress Disorder (PTSD) is an anxiety disorder triggered by exposure to traumatic stressors. At a molecular level, traumatic stress triggers the release of neurotransmitter dopamine (DA), and the corresponding receptors take the role of sensors that signals the fear conditioning (FD) circuit. The proteins in the FD neuronal circuit in turn activate the transcription factor CREB in amygdala...
GaN based devices show great potential for high power, high frequency and extreme-environment applications. Due to spontaneous and piezoelectric polarization properties, these devices are also suitable for pressure monitoring or detection of biomolecules causing surface stress. Therefore, GaN based monolithic sensor system can be applied for the detection of biomolecules or pressure imaging for biomedical...
This paper demonstrates the sensitivity analysis of a piezotransistor-embedded microcantilever sensor facilitated as platform for stress sensing applications. To enhance sensitivity and detection capability, different channel width-to-length aspect ratio transistors are designed and characterized under the mechanical strain at different gate bias. Higher sensitivity is found for the devices with lower...
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