Abstract Novel co‐polymerization polyimide (PI) fibers based on 4,4′‐oxydianiline (ODA)‐pyromellitic dianhydride (PMDA) were prepared. 2‐(4‐Aminophenyl)‐5‐aminobenzimidazole (PABZ) containing the NH group was introduced into structure of as proton donor. The results Fourier transform infrared (FTIR) and dynamic mechanical analysis (DMA) showed that hydrogen bonding occured between chains, which strongly enhanced interchain interaction. This interaction increased tensile strength initial...

Evaluating the performance of low-light image enhancement (LLE) is highly subjective, thus making integrating human preferences into a necessity. Existing methods fail to consider this and present series potentially valid heuristic criteria for training models. In paper, we propose new paradigm, i.e., aesthetics-guided (ALL-E), which introduces aesthetic LLE motivates in reinforcement learning framework with an reward. Each pixel, functioning as agent, refines itself by recursive actions,...

In spray application contexts, plant leaves are bent and twisted upon droplet impact, which has a significant impact on the droplet’s behavior its deposition effect leaves. This study examines of droplets flexible pepper develops mathematical model for spreading rebound, integrating effects leaf bending torsion via energy conservation cantilever beam theory. The required twisting due to was estimated in accordance with Hooke’s law. attained their maximum diameter 4 ms post-impact leaves,...

Evaluating the performance of low-light image enhancement (LLE) is highly subjective, thus making integrating human preferences into LLE a necessity. Existing methods fail to consider this and present series potentially valid heuristic criteria for training models. In paper, we propose new paradigm, i.e., aesthetics-guided (ALL-E), which introduces aesthetic motivates in reinforcement learning framework with an reward. Each pixel, functioning as agent, refines itself by recursive actions. We...

When taking images against strong light sources, the resulting often contain heterogeneous flare artifacts. These artifacts can importantly affect image visual quality and downstream computer vision tasks. While collecting real data pairs of flare-corrupted/flare-free for training removal models is challenging, current methods utilize direct-add approach to synthesize data. However, these do not consider automatic exposure tone mapping in signal processing pipeline (ISP), leading limited...

Abstract A series of random copolyamic acid were synthesized from various ratios two diamines 4, 4′‐oxydianiline (ODA) and 2‐(4‐aminophenyl)‐5‐aminobenzimidazole (PABZ) by polycondensation with pyromellitic dianhydride (PMDA) in N ‐methyl‐2‐pyrrolidone (NMP). Their inherent viscosities the range 1.89–2.91 dl/g. The polyamic (PAA) solution drops spun into fibers wet spinning process. polyimide (PI) obtained PAA after drawn treated heating tube. characterized fourier transform infrared (FTIR),...

We present autonomously-triggered on-chip microfluidic cooling devices that utilize thermo-responsive hydrogels to adapt local environmental temperatures. An external rotating magnetic stirrer couples with an in situ fabricated nickel impeller these centrifugal-based recirculate cooler water. Temperature-responsive hydrogels, which exhibit volumetric expansion and contraction, are integrated at the axle of impeller. In this design, behave similar automotive clutch, autonomously control...

Abstract A kind of hydrophilic nano‐SiO 2 was applied to poly(ethylene terephthalate)/polyamide‐6 (PA‐6) blends. Melt‐blended composites were prepared at various component ratios and different levels. Mechanical, morphological, dynamic mechanical, thermal tests carried out characterize the properties, morphology, compatibilization composites. Increased impact strength, tensile modulus observed by adding particles in The found be preferentially dispersed PA‐6, resulting an increase glass...

In order to investigates the flow and heat transfer characteristics under supersonic mainstream conditions among three typical film hole-configurations—cylinder hole (CH), fan-shaped (FSH), laidback (LFSH), this study conducted numerical simulation using ANSYS CFX based on assumption of compressible flow. The results indicate that cooling effectiveness CH dramatically decreases as blowing ratio increases, while FSH LFSH improves. When encounters coolant, structures such oblique shock waves,...

in view of the rich and complex texture high resolution remote sensing images, a method ship target detection based on SRM segmentation feature extraction layered line segments is proposed. The experimental results show that this paper can effectively detect image, performance using segment better than other common methods. At same time, does not need too many parameters training samples.

Abstract A convenient method of preparing chelating fiber with amine groups on the surface was developed. The precursor polymer Poly( N ‐vinylformamide/acrylonitrile) (P(NVF/AN)) synthesized via solution polymerization, using ‐vinylforaimde as a functional monomer. P(NVF/AN) spun through wet spinning and hydrolyzed in hydrochloric acid to convert formamide moieties corresponding amine. influence hydrolytic conditions hydrolysis degree, such temperature, time, concentrations were examined...

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In order to ensure the healthy safety of edible lettuce, an identification way pesticide residues lettuce leaves is studied. Soilless cultivation sample was adopted. At tillering stage, various levels fenvalerate were sprayed different groups accompanied by a collection and not collected, Hyperspectral Information each blade leaf collected spectral library set up. Randomly 90 samples selected as training samples, classification models based on BP neural network LVQ The remaining taken...