Abstract Large temperature difference is reported to be a risk factor for human health. However, little evidence has the effects of fluctuation on sarcopenia, senile disease characterized by loss muscle mass and function. Here, we demonstrate that higher diurnal range in humans positive correlation with prevalence sarcopenia. Fluctuated exposure (10–25 °C) accelerates atrophy dampens exercise performance mid-aged male mice. Interestingly, fluctuated alters microbiota composition increased...

Clutter background suppression and velocity estimation for moving targets are two critical problems in synthetic aperture radar-ground target indication (SAR-GMTI). A robust principal component analysis (RPCA) method is used to separate the sparse matrix of from low-rank static backgrounds by using amplitude information image domain. However, nonsparsity echoes limits performance RPCA SAR-GMTI, cannot be estimated since phase destroyed soft-thresholding operator process. To solve these...

Integrated sensing and communication (ISAC) waveform design has emerged as a promising technique. However, the existing power-domain techniques involve complex operations, are difficult to strike balance between performance. In this letter, we propose non-orthogonal ISAC design. Our approach involves quantization of symbol its subsequent combination with at transmitters. This process enables successful separation symbols user end while maintaining an acceptable level performance compared...

Clutter background suppression is a critical problem in synthetic aperture radar-ground moving target indication (SAR-GMTI). In general, great quantity of secondary data not easily acquired heterogeneous environments. To solve the clutter suppression, method based on nonlocal self-similarity-robust principal component analysis (NSS-RPCA) proposed for airborne SAR systems. First, discrete separated from echo by RPCA after range pulse compression. Second, similar blocks residual-clutter are...

To improve target detection performance in non-Gaussian backgrounds, the joint design of transmit sequence and receive filter for multiple-input-multiple-output (MIMO) radar is studied. By approximating probability density function observed data with Gaussian mixture model, a Riemannian manifold distribution developed to depict complicated background first. Then, maximizing geometric distance on manifolds, which converted by discrimination between clutter, proposed as criterion filter....

Usually positive side imaging that the direction of beam is vertical to motion used in SAR imaging, and high squint can obtain image target ahead time, therefore it has a certain practical significance. The general synthetic aperture radar algorithm including RD CS only be applied small striped imaging. signal characterizes large range walk curvature. Many realizing through decoupling azimuth dimension. This paper described an improved method based on two-dimension-separated method. new...

For the high-resolution and wide-swath (HRWS) synthetic aperture radar (SAR) system, increasing imaging width results in a serious range ambiguity problem, which affects performance of ground moving target indication (GMTI). In this article, novel nonuniform subpulse coding (NSPC) scheme is proposed. It characterized by resorting to range-frequency band resources detailed design for each subpulse, enabling beam auto-scanning elevation. Also, bandpass filtering digital beamforming (DBF)...

In multi-channel synthetic aperture radar-ground moving target indication (SAR-GMTI), most radial velocity estimation methods are based on the phase difference between channels. However, image coregistration and channel errors will have a severe impact Moreover, it deteriorates performance of estimation. To solve this problem, robust method is proposed using frequency diverse array-SAR (FDA-SAR) in letter. By introducing step frequency, interferometric among channels linear function Doppler...

Range ambiguity can lead to deterioration of imagery quality for space-borne synthetic aperture radar (SAR). To solve this problem, we propose a mitigating range method based on Doppler division multiple access (DDMA) in paper. With the orthogonality DDMA waveform, transmit channels are separated at receiver. Afterwards, pre-processed operation definition domains different is put forward transform all into same one. Thereafter, by multiplying measured data channel complex conjugation those...

Wave gradient encoding can adequately utilize coil sensitivity profiles to facilitate higher accelerations in parallel magnetic resonance imaging (pMRI). However, there are limitations mainstream pMRI and a few deep learning (DL) methods for recovering missing data under wave framework: the former is prone introduce errors from auto-calibration signals (ACS) signal acquisition time-consuming, while latter requires large amount of training data.To tackle above issues, an untrained neural...

Airborne downward-looking sparse linear array 3-D synthetic aperture radar (DLSLA SAR) usually uses a and nonuniform that often does not satisfy the Nyquist sampling theorem. Therefore, cross-track dimensional imaging will fail with traditional frequency-domain algorithms. Several grid-based reconstruction (GB-SR) algorithms have been presented to solve this issue. However, they assume scatterers are located on discretized grids; otherwise, off-grid effect or basis mismatch problem occur. To...

In order to reconstruct the linear frequency modulated (LFM) signal, such as radar signal due complexity. A novel parameter estimation method based on a modified convolution kernel function (MCKF) is proposed for multi-component LFM in this paper. The has fewer external cross-terms and light computational burden because of non-searching operations. Moreover, it robust against additive noise. Finally, simulated real data results confirm method.

Downward-looking sparse linear array 3-D synthetic aperture radar (DLSLA SAR) cross-track dimensional imaging always suffers from incomplete observation which does not satisfy the Nyquist sampling theorem and leads to failure of conventional frequency-domain methods. Although several reconstruction-based methods have been presented solve this problem, basis mismatch issue in reconstruction theory will degrade image performance. To address issue, article proposes a novel method for DLSLA SAR,...

In the complex urban environment, echo signal of low-altitude, slow, and small target (LSS-target) is often submerged in strong clutter, it seriously mixed with slow clutter Doppler domain, resulting a serious decline detection performance radar. To solve this problem, LSS-target method suitable for environment proposed. proposed method, component suppressed through RELAX algorithm firstly, which notably reduces influence point source on weak detection. Then relatively long time set filter...

Decentralized coordination is one of the fundamental challenges for societies and organizations. While extensively explored from a variety perspectives, issue which has received limited attention human in presence adversarial agents. We study this problem by situating subjects as nodes on network, endowing each with role, either regular (with goal achieving consensus among all players), or (aiming to prevent players). show that are, indeed, quite successful preventing consensus. However, we...

CSM or kernel needs to be estimated in conventional parallel image, which is very time-consuming and the estimation process may inaccurate. Here, wave coding model based on virtual conjugate coil using deep generative modes (WV-DGM) proposed for (VCC) extended coding. WV-DGM combined with DGM without training can realize advantages of encoding introduce extra phase reduce ill-condition via VCC. The results vivo demonstrated that achieve better quality compared SENSE while 10x times used...

Reverberation chambers (RC) have been utilized for more than half century. Initially, they employed in measuring the EM properties of material before using EMC performance equipment, like immunity or interference. Recently, reverberation chamber has introduced into evaluation over-the-air (OTA) wireless devices, which include TRP, TIS and gain efficiency antenna. As compared with anechoic other methods, RC method can reduce cost measurement also increase test TRP. In order to further improve...

We are interested in finding nonlinear polynomials $P$ on $\mathbb{R}^n$ that solves the minimal surface equation. first prove a structure theorem such polynomials. show highest degree term $P_m$ must factor as $P_0^kQ_m$ where $k$ is odd, $Q_m\ge 0$ and $P_0$ irreducible, level sets of all area minimizing. Moreover, unique tangent cone $\operatorname{graph} P$ at $\infty$ $\{P_0=0\}\times\mathbb{R}$. If $k\ge 3$, we know further lower order terms down to some divisible by $P_0$. also...

For missile-borne platforms, traditional SAR technology consistently encounters two significant shortcomings: geometric distortion of 2D images and the inability to achieve forward-looking imaging. To address these issues, this paper explores feasibility using a maneuvering trajectory enable three-dimensional imaging by analyzing characteristics an actual platform. Additionally, it derives corresponding resolution characterization model, which lays theoretical foundation for future...