Abstract Many applications, such as hybrid vehicles, pulsed power generators, and factor correction, require capacitors with high energy density to reduce the size or weight of related systems. For these dielectric film are often used because their fast discharge speed density. The commercial available is relatively low cannot meet demands for those applications. In past decade, different polymer‐based materials have been intensively investigated improve materials. Here, progress in...

Flexoelectricity is a gradient electromechanical coupling effect that exists in all dielectrics and important for the understanding of variety gradient-induced physical phenomena design new devices. At present, flexoelectric polymer materials has not been well studied. In this work, thick rectangular poly(vinylidene fluoride) (PVDF)-based samples were fabricated coefficient was measured. Our results show PVDF, which on order several nC/m, more than twice higher P(VDF-CTFE) P(VDF-HFP)...

The flexoelectric effect of polymers is normally much weaker than that ferroelectric oxides. In order to improve the response poly(vinylidene fluoride) (PVDF) polymer, PVDF/Ba0.67Si0.33TiO3 (BST) nanocomposites were fabricated. BST nanofibers prepared by electrospinning method, and fibers further surface modified with H2O2 achieve a stronger interfacial interaction between polymer matrix. Due high dielectric properties strong BST, both constant composite 25 vol. % are 3–4 times higher those...

Compared with their inorganic counterparts, the flexoelectric effect of polymers is much less studied, and mechanisms underlying this gradient electromechanical coupling have rarely been explored. In work, temperature dependence coefficients PVDF-based copolymers terpolymers was measured, that affect response were investigated. For these polymers, decreases abruptly in range where peaks dielectric loss or mechanical are observed. These originate from phase transition polymer chain relaxation...

Multifunctional materials which generate response under different stimuli are important for sensor and actuator applications. In this work, to achieve multifunctional materials, the composites of P(VDF-TrFE) ferroelectric polymer BiFeO3–BaTiO3 nanofibers designed in an attempt exploit properties ferromagnetism optical nanofibers. The addition not only improves dielectric, piezoelectric, pyroelectric but also creates multiple functionalities, include ferromagnetism, magnetoelectric effect,...

The low piezoelectric response (piezoelectric coefficient d33 lower than 30 pC N−1) of PVDF-based polymers limits their practical applications. Here we report a mechanical structure which can enhance the effective P(VDF-TrFE) copolymer. polymer films were fabricated into circular arch or arrays structures. When plane force was applied to films, is concentrated at outer rim structure. be enhanced by >70 times because stress concentration and measured as high 1990 N−1. exhibit an energy...

By exploiting the flexoelectric effect, piezoelectric composites, in which none of individual components is piezoelectric, can be designed. Here, composite was designed and fabricated using polyvinylidene fluoride (PVDF). Although response PVDF much lower than that ferroelectric ceramics, are normally utilized to fabricate composites because their high response, a relatively apparent (>11 pC N−1), obtained polymer-based its low elastic modulus. Our results demonstrate polymers used with good...

Stereoscopic image quality assessment is an effective way to evaluate the performance of stereoscopic video systems. However, most existing 3D methods cant be consistent with subjective results caused by unconsidered information depth or disparity. In this paper, a blind method for images proposed using deep learning and natural scene statistics. The composed two stages: firstly, distorted classified into symmetrical asymmetrical distortion characteristics wavelet domain disparity image....

The electronic health record (EHR) is an history produced directly in personal health-related activity and worth keeping for future reference to management clinical decision-making. We aimed study establish EHR standard system that has tremendous potential value avoid the confusion of mode, low-level repetitive construction ldquoinformation islandrdquo phenomenon. According processes characteristics care system, we described current status trend based on basic theory standardization,...

K-anonymity is one simple and efficient method to achieve sensitive data protected in sharing application. The traditional k-anonymity techniques, however, have all tuples of publishing database involve anonymity generalize which lead reduce the precision table. This paper firstly proposes a Naïve Sensitive Tuple Anonymity Method. In this only are generalized, other can be directly published. order improve security publish data, after were anonymized, we selected some proportion...

The key point for improving efficiency of Electric Hot Machining (EHM) is to keep an optimal heating temperature in cutting process. This paper introduces the principle and system realizing current control, applied minipore drill hard-material, a method rapid determining under various conditions electric hot drilling proposed based on conservation law optimum temperature. For certain combination tool workpiece, different can be obtained by changing measuring drilling.

Purpose This study aims to examine the acceptance of adaptive learning (AL) amongst construction professionals in Singapore. It seeks compare their perceptions and attitudes with those from other industries assess rate AL adoption sector. Furthermore, identify factors influencing professionals’ intention adopt technologies. Design/methodology/approach A questionnaire survey was conducted 188 153 non-construction professionals. By employing extended unified theory use technology (UTAUT2)...

Abstract In the actual traffic intersection environment, vehicles adopted for monitoring miss detection due to various reasons, and because difference between different types of is very small, traditional method cannot effectively distinguish vehicles, deep learning image processing can be used automatic recognition vehicle types. We propose an improved AlexNet [1] (ProAlexNet) classification by improving reconstructing hierarchy parameters convolutional neural network structure. addition,...

Digital hospital construction, which has become the basic project of modern hospital, gave a challenge to current management pattern and concept. In view characteristics problems digital this paper analyzed developing trends discussed multi-layered architecture with medical equipments, computer network platform business application system as core. The author suggested constructing data storage center five major platforms health care core implement intercommunication among work systems...

This paper studies drilling force of pore for hard-cutting material based on theoretical and experimental investigation during process. A coupled thermo-mechanical finite element model metal process was established. Some key techniques such as model, chip separation damage criteria dynamic mesh self-adapting technology in the simulation cutting were discussed details. The simulated dynamically formation twist which rigid plastic selected workpieces thermal models tools. results indicate that...

The main aim of cache selection algorithms in current proxy servers is to get higher hit-ratio, they usually don't concern the validation and update outdate pages. In this paper a new benefit model defined, relevant factors including cost are considered obtain optimal set. According model, an algorithm - DWCS (Dynamic Web Cache Selection) presented, it proved be under reasonable hypothesis. experimental results show efficiency algorithm.

In this work, we show that a [Formula: see text]150 pC/N can be obtained in nonpoled poly(vinylidene fluoride trifluoroethylene) (P(VDF-TrFE)) copolymer films with an arch structure. The films, which are often thought to homogeneous, fact inhomogeneous microstructure and physical properties after film fabrication. Although large proportion of the is nonpolar, as expected ferroelectric film, surface regions spontaneously polarized. We propose stress regions, either from constraint substrate...

The bug reports' severity can be used for developers to prioritize which bugs fixed first. However, this process depends on the developers' expertise in assigning correct severity. In our previous study, we propose a novel report prediction method EKD-BSP, utilizes summary and keywords extracted from description. class imbalance exists gathered datasets. To solve issue, design CIL-BSP by further considering imbalanced methods. Moreover, apply hyperparameter optimization consider different...