We report on the fabrication of highly sensitive ratiometric fluorescent pH and temperature probes based thermoresponsive double hydrophilic block copolymers (DHBCs) with two blocks labeled types dyes possessing different pH-switchable emission characteristics. P(NIPAM-co-FITC)-b-P(OEGMA-co-RhBAM) DHBCs were synthesized via consecutive reversible addition–fragmentation chain transfer (RAFT) polymerizations in combination post-modifications, where NIPAM, OEGMA, FITC, RhBAM are...

Nearfield acoustic holography based on the compressed sensing theory can realize accurate reconstruction of sound fields with fewer measurement points premise that an appropriate sparse basis is obtained. However, for different types sources, bases are diverse and should be constructed elaborately. In this paper, a block Bayesian learning (SBL) equivalent source method proposed realizing radiated by including spatially extended mixed ones above two, without elaborate construction basis. The...

The growing need for food provision and materials challenges the maintenance of ecosystem services. Understanding composition services factors that affect are critical to improving rural development. An assessment in densely populated areas East China has been conducted. results show average value was 34.99 thousand RMB/ha. 30.01 RMB/ha, which main part relationships between were complex. Provision (nutrition) had no significant correlation with regulation (material) mainly influenced by...

Cotton fiber, renewable natural cellulose, make up the largest portion of textile waste. The ionic liquid method has been successfully employed to regenerate waste colored cotton fabric in this study, offering a comprehensive approach recycling cotton. chemical recovery process for reclaimed cellulose materials is crucial high-value fabrics. In and new, white fabrics were used as experimental subjects. breaking strength, degree polymerization, iodine adsorption equilibrium value,...

Transient nearfield acoustic holography based on an interpolated time-domain equivalent source method (ESM) is proposed to reconstruct transient fields directly in the time domain. Since strengths solved by traditional ESM formulation cannot be used pressure surface directly, interpolation function introduced develop which permits one deduce iterative reconstruction process. As process ill-conditioned and especially there exists a cumulative effect of errors, Tikhonov regularization...

Th e Laplace transform formulation proposed by Di and Gilbert [J. Acoust. Soc. Am. 93, 714–720 (1993)] is an efficient accurate method for calculating the half-space Green's function. However, integral upper limit required in this has not been examined context of extended reacting reflecting plane, which a critical parameter influencing both accuracy efficiency formulation. In article, further explored, novel identifying limit, verified through numerical studies.

The impedance tube method, particularly the two-microphone is widely employed for measuring normal acoustic parameters. However, this method constrained by assumption of plane wave, leading to limitations on effective frequency range. To resolve limitations, paper proposes a data-driven capable accurately predicting sound absorption coefficient using only two microphones in multi-modal field. First, proposed integrates neural network model with transfer relationship tube, and generates large...

A time-domain plane wave superposition method is proposed to reconstruct nonstationary sound fields. In this method, the field expressed as a of time convolutions between estimated time-wavenumber spectrum pressure on virtual source and propagation kernel at each wavenumber. By discretizing directly, reconstruction can be carried out iteratively in domain, thus providing advantage continuously reconstructing time-dependent signals. process, Tikhonov regularization introduced step obtain...

An inverse direct time domain boundary element method (IDTBEM) is proposed for the reconstruction of transient acoustic field radiated by arbitrarily shaped sources. The based on theory (DTBEM), which free from calculation hypersingular integrals, and thus, its process relatively simple easy to implement. However, formulations DTBEM cannot be used directly field, therefore, new with a modified axis are derived. With these formulations, linear system equations formed performed in...

In this paper, a series of impulse response functions between acoustic quantities on the source plane and particle velocity hologram are derived. virtue these functions, real-time nearfield holography (RT-NAH) is extended from pressure-based to velocity. Pressure, normal velocity, acceleration, displacement radiated planar sources can be reconstructed by measuring time-dependent signals plane. A simulation an excited aluminum plate performed evaluate difference in accuracy RT-NAHs based...

This paper proposes a distorted hologram data repair approach for sound field reconstruction. In this approach, an equivalent source model is established by placing set of sources near the surface to represent measured pressures. Each pressure simultaneously assigned indicator describe whether its measurement corrupted errors or not. then formulated within modal framework utilizing modes generated through singular value decomposition transfer matrix between and nearby surfaces. Subsequently,...

VF is induced during ICD implantation to determine efficacy of therapy. Establishing the best clinical method induction would potentially be beneficial in reducing number attempts and frequency inadvertent VT. Commonly used methods induce include shock T wave vulnerable period (T shock) high stimulation. This study compared with a new using 9‐V DC pulse. The was randomized, prospective, case crossover trial patients receiving ICDs. by randomized sequence an implant. at least four times each...

Planar near-field acoustic holography has been successfully extended to reconstruct the sound field in a moving medium, however, reconstructed still contains convection effect that might lead wrong identification of sources. In order accurately identify sources time-domain equivalent source method is developed. method, real replaced by series whose strengths are solved iteratively utilizing measured pressure and known convective Green's function, time averaging used reduce instability...

Stability of the inverse time domain boundary element method (ITBEM) for near-field acoustic holography is investigated. An eigenvalue system built by reformulating ITBEM to an iterative format. Through analysis system, a stabilization criterion derived. Then utilized reveal mechanism TSVD which plays important role in ITBEM. Furthermore, properly choosing ratio truncated singular values ensure stability provided. Although can be managed using method, accuracy results cannot always...

This paper examines the feasibility of extracting non-stationary sound field generated by a target source in presence disturbing from single layer pressure-velocity measurements. Unlike method described previous [Bi, Geng, and Zhang, J. Acoust. Soc. Am. 135(6), 3474–3482 (2014)], proposed allows measurements pressure particle velocity signals on plane instead two planes, time-dependent is extracted simple superposition measured convolution between corresponding impulse response function....

The compressive-equivalent source method (C-ESM) can reconstruct the sound field radiated by sparsely distributed sources with a reduced number of sensors. To ensure performance C-ESM, transfer matrix between sensors and equivalent point should exhibit sufficient incoherence. Given that configuration sensor array affects this incoherence condition, concern regarding design would arise. address such concern, paper proposes approach. primary objective approach is to minimize mean coherence...

3D insect models are useful to overcome viewing angle variations and self-occlusions in computer-assisted taxonomy for electronic field guides. The acquisition of information is, however, unreliable due the flexibility small size bodies. This paper explores how infer from a single 2D image, which will assist both description identification. structure body is modeled two geometric primitives, generalized cylinders deformable ellipsoids. primitives fitted warped based on edge medial axis...