We present the analytical design and experimental realization of a scheme based on multi-arm coiling slits to generate stable acoustic vortices in broadband. The proposed structure is able spiral wave spatially twisted with invariant topological charge for long propagation distance. Compared conventional methods which require electronic control bulky loudspeaker, this provides an effective compact solution controllable broadband, offers more initiatives demanding applications.

A good thermoelectric material usually has a high power factor and low thermal conductivity for figure of merit (<italic>ZT</italic>), is also environmentally friendly economical.

Reduced models of SAW-PDMS acoustofluidics need to be reconsidered especially the neglect shear waves and interface damping.

Vibration sensors are integral to a multitude of engineering applications, yet the development low-cost, easily assembled devices remains formidable challenge. This study presents highly sensitive flexible vibration sensor, based on piezoresistive effect, tailored for detection high-dynamic-range vibrations and accelerations. The sensor’s design incorporates polylactic acid (PLA) housing with cavities spherical recesses, polydimethylsiloxane (PDMS) membrane, electrodes that positioned above....

A new catalytic conversion type of nitro substrate with CO2 as a single-carbon source is presented, wherein great collection azaheterocycles generated by newly established iridium-catalyzed, copper-induced reductive system. This procedure handily employs poly(methylhydrosiloxane) (PMHS) the reductant to simultaneously realize dual reduction highest oxidation-state and units in one operation. Elaborate mechanistic studies illustrate essential role iridium catalyst reducing NO2 moiety well...

A divergent [5 + 1] cyclization reaction of o-aminobenzamides with vinylene carbonate has been developed, rapidly generating three types cyclic molecules including quinazolinones, 2-methylquinazolinones, and 2,3-dihydroquinazolinones high chemoselectivity. In this discovery, blooms as a multifunctional reagent to participate in cyclization. The potential new finding is further emphasized by assembling the benzothiazole heteroarene via [4 version tolerating bioactive units well.

Finger vein verification is using patterns to verify a person's identity, which widely used in various fields. In practice, the method for most important part of biometric system, determines reliability system. this paper, we propose methods called DeepVein finger based on deep convolutional neural networks and conduct experiments evaluate our methods. The experimental results show that proposed can achieve state-of-the-art performance accuracy. addition, present how amount data training...

Acoustic standing waves have been widely used in trapping, patterning, and manipulating particles, whereas one barrier remains: the lack of understanding force conditions on particles which mainly include acoustic radiation (ARF) streaming (AS). In this paper, micrometer size polystyrene microspheres wave fields were investigated. The COMSOL® Mutiphysics particle tracing module was to numerically simulate various as a function time. velocity movement experimentally measured using imaging...

The terahertz (THz) band has a great potential for the development of communication technology, but it not been fully utilized due to lack practical devices, especially actively controllable multifunctional devices. Here, we propose and demonstrate Ge

Direct functionalization of the C(O)-N amide bond is one most high-profile research directions in last few decades; however oxidative couplings involving bonds and thioamide C(S)-N analogues remain an unsolved challenge. Herein, a novel hypervalent iodine-induced twofold coupling amines with amides thioamides has been established. The protocol accomplishes divergent disconnection by previously unknown Ar-O Ar-S highly chemoselectively assembles versatile yet synthetically challenging...

In our previous study, early oral feeding following McKeown minimally invasive oesophagectomy (MIE) has been shown to be a safe and feasible approach for recovery of intestinal function an improvement quality life. This study investigates the effect 'chewing 50 times per bite' on MIE.Between May 2016 December 2016, we retrospectively analysed 95 cases oesophageal carcinoma in patients who underwent MIE department. All received instructions method solid food intake postoperative day (POD) 1....

As a unique coherent diffraction imaging method, X-ray ptychography has an ultrahigh resolution of several nanometers for extended samples. However, is often degraded by various noises that are mixed with diffracted signals on the detector. Some can transform into periodic artifacts (PAs) in reconstructed images, which basic problem raster-scan ptychography. Herein, we propose novel periodic-artifact suppressing algorithm (PASA) and present new understanding PAs or raster-grid pathology...

The spin-selective absorption (SSA) usually means absorbing one spin state of a circular polarized (CP) wave while reflecting the orthogonal one. Here, we propose two types (type 1 and type 2) dual-band SSA with strong dichroism based on chiral metasurface operating at terahertz region. For proposed metasurface, can absorb same CP in adjacent bands, 2 first band second band. physical mechanism is discussed by introducing multiple interference model detailed equation derivation process....

Binaural rendering is of great interest to virtual reality and immersive media. Although humans can naturally use their two ears perceive the spatial information contained in sounds, it a challenging task for machines achieve binaural since description sound field often requires multiple channels even metadata sources. In addition, perceived varies from person same field. Previous methods generally rely on individual-dependent head-related transferred function (HRTF) datasets optimization...

Capturing CO2 is highly valued in the field of organic synthesis, especially underdeveloped dual-CO2 conversion. In this study, we detail a novel reductive cyclization 2-indolylanilines with dual as difunctional reagent presence PMHS [poly(methylhydrosiloxane)], delivering methyl-substituted quinoxalines. Furthermore, another chemoselective 2-pyrrolylanilines also realized by converting mono-CO2. Mechanistic investigations shed light upon fact that substrate-controlled divergence mainly...

High intensity focused ultrasound (HIFU) has been proven to be promising in non-invasive therapies, which precise prediction of the field is crucial for its accurate and safe application. Although Khokhlov–Zabolotskaya–Kuznetsov (KZK) equation widely used calculation nonlinear acoustic HIFU, some deviations still exist when it comes dispersive medium. This problem also exists as an obstacle Westervelt model Spherical Beam Equation. Considering that KZK most prevalent HIFU applications due...

Field mapping of the acoustic radiation force and streaming is important for design calibration tweezers, but we lack a method to disentangle obtain accurate pictures these fields. This study proposes technique multiradius microparticle image velocimetry, solve this problem. The requires no special assumptions about driving field, motorized scanning unnecessary. approach should impact various technologies particle manipulation, including those exploiting acoustic, optical, dielectrophoretic,...

Finger-vein recognition as a non-contact biometric technique has its inherent superiority on accuracy, speed, sanitation, maintenance and security. However, we found that due to posture changes when acquiring finger images, the discrepancy between different images from same greatly lowers performance of entire system. In this paper, define 6 types changes, analysis how they influence imaging. We then proposed method reconstruct 3D normalized model 2D which can be used map area in image into...

Acoustofluidic devices based on standing surface acoustic waves (SSAWs) have shown great potential in the manipulation of particles and cells. However, characterizing field a microchannel is difficult. This work introduces an analytical acoustophoretic model that shows that, by identifying time period particle rearrangement width eventually formed “particle strip,” pressure amplitude one-dimensional (1D) SSAW-actuated microchamber could be estimated quantitatively. Experiments are carried...

Finger vein recognition is a newly developed and promising biometrics technology. In current researches, finger algorithms are mostly evaluated on data collected in laboratory environment. Along with its development, this technology gradually transforms from to actual use. images captured operational systems different those obtained the lab, due uncontrollable acquisition condition users' behavior. The 2nd Vein Recognition Competition (FVRC2016) was organized for purpose of assessing...

X-ray ptychography is a popular variant of coherent diffraction imaging that offers ultrahigh resolution for extended samples. In x-ray instruments, the Fresnel zone-plate (FZP) most commonly used optical probe system both soft and hard x-ray. FZP-based with highly curved defocus wavefront, reconstructed image quality can be significantly impacted by initial function form, necessitating construction suitable successful reconstruction. To investigate effects forms on reconstruction, we...

Herein, we disclose a novel reorganization/cycloaddition between two imine units catalyzed by In(OTf) 3 Lewis acid that differs from the well-known [4 + 2] cycloaddition version via Povarov reaction.

Biometric recognition requires that the biometric characteristics used for verification should be unique among individuals. The purpose of this study is to verify individuality finger vein, a new trait with superiority on accuracy and security. To carry out research, we construct large-scale vein database consisting 710,399 images from 363,703 fingers. We adopt score level fusion strategy reduce negative impact algorithm deficiencies. also design distributed computing system more than 83...