This paper reports the development of an unconstrained sensing technique for monitoring respiration and heartbeats during sleep using a polyvinylidene fluoride (PVDF) piezopolymer film sensor with aim that can be used on ordinary bed together condition use does not interfere daily patient under measurement. A PVDF is as sensory material in system. The placed sheet at location thorax to pick up fluctuation pressure caused by respiratory movement heartbeats. Wavelet multiresolution...

Abstract Digital image processing has become the mainstream method for measuring aggregate morphologies. However, results of are seriously affected by laying style aggregates. This study proposes a morphological analysis based on three‐dimensional curvature analysis. The show that values maximum and standard deviation Gaussian surface can be used to represent angularity texture, respectively. relative ranking methods according accuracy places as largest least, with profile falling in...

Bimetallic-clad pipes demonstrate exceptional advantages in transporting corrosive oil and gas through the combination of load-carrying capacity base material anti-corrosive function thin layer corrosion-resistant alloy. This study investigates mechanical properties 24-inch X65 + Alloy625 metallurgically clad experimental tests finite element analysis. Uniaxial tensile testing with digital image correlation reveals uniform deformation between layers until interfacial failure initiates at an...

Comprehensive Summary Ethylene/norbornene(NBE) copolymers are the most representative and widely‐used cyclic olefin (COCs). Higher NBE content in COCs leads to higher transparency, glass transition temperature mechanical strength, but also makes COC more brittle therefore hampers its end uses. In this study, improve brittleness of while maintaining their high heat‐resistant bimodal distributed have been prepared via two selective catalysts reactive blending one pot. The shape molecular...

In nature, cyclopropylcarbinyl cation is often involved in cationic cascade reactions catalyzed by natural enzymes to produce a great number of structurally diverse substances. However, mimicking this process with artificial organic catalysts remains daunting challenge synthetic chemistry. We report small molecule-catalyzed asymmetric rearrangement cations, leading series chiral homoallylic sulfide products good excellent yields and enantioselectivities (up 99% enantiomeric excess). the...

Squat toilets are widely used in developing countries due to local customs and low costs. The flushing of a squat toilet can entrain strong airflow produce aerosols. This investigation constructed lavatory mock-up with toilet. flushing-induced was both visualized quantitatively measured by particle image velocimetry. maximum height the impacted identified an ultrasonic anemometer. For inference emission rate, bowl covered enclosed box for concentration measurement. risks from skin contact...

本論文では, 自動車の進行方向の速度変動に起因する乗り心地に関して検討する. 自動車走行中に伴う速度変動に対して, 乗り心地評定実験を行い, 乗り心地評定値と速度変動を表す諸物理量との関連を検討した. 進行方向の加速度およびジャークを説明変量とし, 被験者の乗り心地評定値を目的変量として, これらを関係付ける線形重回帰モデルを構築し, 客観的な乗り心地指数を定式化することを試みた. その結果, 実験より得られた被験者の乗り心地評定値と構築したモデルより推定した乗り心地指数との間に高い相関があり, 提案した線形重回帰モデルを用いた乗り心地評価の手法が有効であることが確認された. こうした研究を進めることにより, 乗り心地を規定する物理的情報をある種の乗り心地指数として運転者にフィードバックすることで運転手の運転手法を改善し, 乗客に優しい運転が実現できることが期待される.

Low-coherence interferometry (LCI) has proved to be a useful tool in optical measurement and detection. However, the noise that is present practical applications makes interference term retrieval (ITR) difficult. In this paper, we propose novel technique based on ensemble empirical mode decomposition (EEMD-EMD) achieve automatic ITR from spectral domain LCI. EEMD, correlation coefficient of each intrinsic function (IMF) calculated, characteristic parameter (CP) introduced recognize remove...

Aryl hydrocarbon receptor (AhR) nuclear translocator (Arnt) gene has been isolated and characterized from a mouse genomic DNA library. The is about 60 kilobases long split into 22 exons. An unusual exon/intron junctional sequence was found in the 11th intron of that begins with GC at its 5'-end. arrangement mArnt differs greatly those other members same basic-helix-loop-helix/PAS family. TATA-less several transcription start sites. promoter region GC-rich contains number putative regulatory...

Abstract The stochastic P-bifurcation behavior of a bistable Van der Pol system with fractional time-delay feedback under Gaussian white noise excitation is studied. Firstly, based on the minimal mean square error principle, derivative term found to be equivalent linear combination damping force and restoring force, original further simplified an integer order system. Secondly, stationary Probability Density Function (PDF) amplitude obtained by averaging, critical parametric conditions for...

This paper presents a systematic methodology focused on herringbone gear microgeometry modifications toward vibration reduction. The dynamic model considering the unique characteristics of aviation is developed to study behavior. optimal ease-off shape can be defined as outcome multi-objective optimization process, objective functions are loaded transmission error, meshing impact excitation and root mean square (RMS) acceleration. With special attention given computational efficiency, novel...

This paper reports the development of a wrist-watch type wearable system for mental stress evaluation. A pulse sensor has been developed using PVDF film heart beat intervals detection. Visualization modified Symmetrized Dot Patterns (SDP) method proposed. The is testified through experiments.

Top tension riser is one of the most frequently used and vulnerable equipment in deep-sea petroleum engineering. With experiments CFD simulations, researchers have found some hysteresis phenomenon bistable behavior vortex-induced vibration cylinders. However, there still insufficient research on bifurcation multi-stable vibration. In this study, based Van der Pol wake oscillator model, cross-flow governing equations fluid structure–coupled system linear shear flow are established. Then...

This paper describes the development of a driver assistance system for improving passenger ride comfort automobiles. Based on results psychophysical experiments subjective evaluation, linear multiple regression model that evaluates discomfort index (RDI) is proposed using longitudinal acceleration and jerk automobile as explanatory variables. In order to reduce caused by velocity fluctuation an automobile, microcomputer-based RDI informs in real time both visual auditory means developed....

This paper investigates the stochastic P-bifurcation behavior of bistability in a generalized Van der Pol system with fractional time-delay feedback under additive and multiplicative Gaussian white noise excitations. First, using minimal mean square error principle, derivative is found to be equivalent linear combination damping restoring forces, original transformed into an integer-order system. Second, stationary probability density function amplitude obtained by averaging, according...

This article presents the development of an implanted artificial urethral valve that is used for treatment urinary incontinence, with emphasis on a transcutaneous power transmission system closed-loop thermal control function. The uses shape memory alloy (SMA) plate as actuator, which activated batteries placed outside patient’s body using system. equipped temperature monitor circuit and controller to prevent SMA actuator from being overheated during prolonged urination. Laboratory...

This study focuses on the attitude control of a flexible spacecraft comprising rotating appendages, magnetic bearings, and satellite platform capable carrying solar panels. The kinematic dynamic models were established using Lagrange methods to describe translation rotation system its connected components. A simplified model dynamics five-degrees-of-freedom (DOF) active bearing was developed equivalent stiffness damping based gap variations in bearing. Next, fixed-time sliding mode method...

Frequency domain heart rate variability (HRV) analysis has been extensively applied in assessment of mental/physical stress since it provides a non-invasive tool to assess the status autonomic system (ANS). However, there are many situations, such as exercise, where rare changes rapidly over time, making frequency HRV unsuitable because assumption stationarity is not satisfied. Meanwhile, investigation these rapid considerable interest. Here, authors introduced new simple time index for if...

本論文では, 自動車が曲線を走行する際の左右方向の速度変動に起因する乗り心地に関して検討する. 自動車走行に伴う左右方向の速度変動に対して, 乗り心地評定実験を行い, 乗り心地評定値と速度変動を表す諸物理量との関係を検討する. 左右方向の加速度およびジャークを説明変量, 被験者の乗り心地評定値を目的変量として重回帰分析を行い, これらを関連付ける客観的な乗り心地指数を定式化することを試みる. また, そのモデルを比較検討することで, 乗車姿勢の違いによる乗り心地の違いを明らかにする.