Fall is a challenging task that poses great danger to the elderly person's health as they carry out their daily routines and activities could lead serious injuries, long hospitalization, or even death. One of key solutions this important problem prompt automatic detection fall motion, among other activities, so immediate help can be rendered avoid further complications. Cameras wearable sensors are conventional means employed monitor performed by people. However, recently radar sensing...

In this paper, a class of bandpass frequency selective structures (FSSs) with improved out-of-band rejection is proposed by using stacked slotlines. The FSS consists periodic array slotlines etched in pieces single-layer printed circuit boards, which are vertically placed along the plane and then together certain distance. Due to special arrangement, slotline resonators constructed based on desired propagation modes, thus leading stable filtering response wide range. To better understand...

This letter proposes a dual-polarized frequency selective rasorber (FSR), which exhibits bandpass filtering response together with absorption performance at both sides of the passband. Although design concept is modified from three-dimensional FSR, proposed FSR implemented by cross-inserting few identical printed circuit board pieces etched planar slotline structures, thus releasing difficulties in fabrication and assembly. The characteristic provided lossless resonators constructed...

Static corrosion tests in LBE under oxygen-saturated and –depleted conditions at 500 °C for 1000 h were conducted to investigate the corrosion-induced diffusion layers on T91 SS316L steels subject dissolution oxidation corrosion. Following nano-indentation experiments examined variation of local mechanical properties within layers. Under present conditions, steel showed better resistance while higher susceptibility against SS316L. For both steels, results a gradual decrease from matrix side...

Compared with the traditional time division multiple access -multiple input output (TDMA-MIMO) radar, Doppler (DDMA-MIMO) radar enables design of orthogonal waveform in domain instead domain. Thus DDMA-MIMO performs well long range application. However, it suffers from ambiguous and energy defocus target spectrum as a result detection performance degrades. To tackle these problems, algorithm based on subbands coherent-accumulation (MSCA) is proposed this paper. First, empty-band inserted...

Traditional monopulse angle estimations are mainly based on phase comparison and amplitude methods, which commonly adopted in narrowband radars. In modern radar systems, wideband radars becoming more important, while the estimation for signals is little studied previous works. As noise has larger bandwidth than radars, challenge lies accumulation of energy from high resolution range profile (HRRP) monopulse. linear frequency modulated (LFM) frequently utilized. this paper, we investigate...

High linearity and low noise are important conditions for high-resolution imaging in wideband linear frequency modulation (LFM) radar systems, where stretch processing is commonly adopted. However, practice, hardware may introduce amplitude phase distortions to signals. The will increase the range sidelobes (RSLs) of dechirped returns cause decline quality. Traditional time-domain RSL correction methods greatly influenced by time delay can only be used a small window. To solve problem, we...

An anisotropic glucose oxidase-polymer surfactant nanoconjugate is synthesized and shown to exhibit complex temperature-dependent phase behavior in the solvent-free state. At close room temperature, crystallizes as a mesolamellar soft solid with an expanded interlayer spacing of ca. 12 nm interchain correlation lengths consistent alkyl tail-tail PEO-PEO ordering. The displays birefringent spherulitic texture melts at 40 °C produce liquid protein without loss enzyme secondary structure. melt...

Objective To evaluate the beneficial effects of hydroxysafflor yellow A (HSYA) on monocrotaline (MCT)-induced pulmonary arterial hypertension (PAH) in rats, and to investigate main pathophysiological mechanism HSYA preventing development MCT-induced PAH. Methods Four groups (control, control with treatment, MCT-exposed, MCT-exposed treatment) were evaluated at day 28 following MCT exposure. Haemodynamic measurements, right ventricular hypertrophy, morphometry, inflammatory cytokines oxidant...

This investigation mainly focused on revealing the importance and function mechanism of intensive mixer sintering performance with 100% fine-grained iron ore materials (the proportion −0.074 mm exceeding 80%) through both lab-scale tests statistic analyses. Results indicated that compared conventional drum mixing, mixing reduced proper moisture consumption considerably from 9.25% to 8.75%, while granulation effect sinter product quality achieved a remarkable improvement. Intensive realized...

The surface of haemoglobin (Hb) is chemically modified to produce molecular dispersions discrete core–shell Hb–polymer surfactant bionanoconjugates in water and organic solvents. hybrid nanoconstructs exhibit peroxidase-like catalytic activity with enhanced turnover rates compared native Hb water.

Fe-Ni-Co-based shape memory alloys (SMAs) enjoy a wide application prospect in seismic protection structures or components owing to their advantages of high strength, excellent cold workability and low material cost. In this study, the effects microstructure grain orientation on effect (superelasticity) were investigated, which could offer theoretical guidance for texture control during fabrication process high-performance SMAs. The results showed that, recoverable strain values by...

Abstract In double‐satellite interference localization system, the position of source is computed by estimating time difference arrival (TDOA) and frequency (FDOA) between signals retransmitted two satellites. The traditional cross ambiguity function (CAF)‐based TDOA/FDOA estimation method requires constant received signals, which can be satisfied only when signal length short. Therefore, CAF cannot applied in long‐time accumulation (LTA). To solve this problem, a novel LTA proposed based on...

The HUST field-reversed configuration (HFRC) is a field reversed plasma research device based on colliding and merging under design. To increase the parameters of initial formed in theta-pinch, theta-pinch designed with very high parameters, namely chamber diameter 0.6 m, bias magnetic -0.16 T, preionization frequency 150 kHz, main T. control formation ejection, discharge regulating accuracy for required within several microseconds. Thus, voltage, current pulsed power supply controllability...

In practical hardware platforms such as FPGA or DSP, the FFT operation is based on a length of 2^L. However, due to system limitation, sampled signal would be not equal Thus, zero-padding performed before operation. Most traditional sinusoidal frequency estimation methods are for signals without zero-padding. When applying these zero-padded signal, performances degrade. To solve this problem, novel method proposed in paper. method, analytical expression DFT after derived. Then an amplitude...

Spiral tubes are used in a wide range of applications and it is significant to understand the vibration introduced by two-phase flow spiral tubes. In this paper, numerical method study induced gas-liquid tube with different regimes. The pressure fluctuation characteristics at pipe wall solid response obtained. results show that motion small bubbles bubbly leads fluctuations low-frequency broadband (0–50 Hz). gas plug causes amplitude periodic shortened (0–15 Hz) compared flow. slug large...