Aerostatic bearings are widely used in the field of ultraprecision machining. It is well known that orifice restrictor with a recess has higher load capacity and stiffness than inherent restrictor. However, it inevitably brings more serious micro-vibration problem, which probably related to large-scale vortices recess. To this end, suppress aerostatic bearing vibration, we have designed novel micro cylindrical array (RMCA-I RMCA-II) smash vortices. Meanwhile, investigated vibration...

A newer exposure tool has been developed for health and safety practitioners to assess the risks work-related musculoskeletal disorders. The is based on practitioners' needs such a “state of art” research findings. QEC tested, modified validated upon various simulated practical tasks, with help up 150 practitioners. studies have shown that high level sensitivity usability, exhibits largely acceptable inter/intra-observer reliability. Field also indicate is, in practice, reliable applicable...

Compared to traditional EDM processing, UEDM (Ultrasonic Vibration Assisted EDM) have a great improvement in optimizing discharge environment. In this study, ultrasonic vibration is attached the electrode. According relative positional relationship between movement path of electrode tip and gap, four working states are defined. The within contact with edge part end outside workpiece, respectively. States analyzed from effective energy frequency. A mathematical model for surface roughness...

Efficient adsorbents are critical to the purification of liquefied natural gas (LNG) by adsorption method. In this study, physiochemical properties JLOX-500 and 13X were examined. with more Al content had a compact unit cell, larger surface area pore volume, smaller average size, microchannels on than 13X. The separation performance two was evaluated experiment. CO2 capacity higher that 13X, while equilibrium ideal selectivity factor CO2/CH4 also for JLOX-500. Especially in dynamic...

A tool has been developed for health and safety practitioners to assess the exposure workplace risks work-related musculoskeletal disorders. The is based on practitioners' needs “state of art” research findings. QEC tested, modified validated using both simulated real tasks, with help approximately 150 practitioners. studies have shown that a high level sensitivity usability, exhibits largely acceptable inter/intra-observer reliability. Field also indicate is, in practice, reliable...

CRYSTALS-Dilithium is a lattice-based post-quantum digital signature scheme that resistant to attacks by quantum computers and has been selected be standardized in the NIST cryptography (PQC) standardization process. However, speed performance design flexibility of Dilithium still need evaluated. This article presents high-performance software/hardware co-design based on PQC round-3 parameters. High-speed pipelined hardware modules for NTT/INTT, point-wise multiplication/addition, SHAKE are...

LoRa is a promising choice for deploying an IoT network due to its lightweight feature and the extensive support by Alliance. However, as fundamental part of LoRa, typical LoRaWAN protocol confronts severe security challenges because it insecurely utilizes AES-128 low-cost feature. In this paper, we propose systematic solution that compatible with applications. We extend standard public-key infrastructures. Public-key features like Key exchange authentication are supported hardware...

We present a numerical study of the normal modes vibration both homogeneous and heterogeneous finite length cylindrical shells arbitrary wall thickness with applications toward single multiwall carbon nanotubes in continuum limit. The method is checked by comparison computed measured resonance spectra for machined aluminum shell. dependence natural frequencies various radial radius tubes investigated compared to atomistic models Raman spectroscopy data. breathing mode four harmonics squash...

Precipitable water vapor (PWV) is an important meteorological factor for predicting extreme weather events such as tropical cyclones, which can be obtained from zenith tropospheric delay (ZTD) by using a conversion. A time difference of ZTD arrival (TDOZA) model was proposed to monitor the movement and fifth-generation reanalysis dataset European Centre Medium-range Weather Forecasting (ERA5)-derived (ERA5-ZTD) used estimate cyclones based on model. The global navigation satellite...

With the register detection problem , color textile image segmentation algorithm based on M ean S hift and block matching Harris corner were proposed. The extended wa s used to segment image, then different regions extracted from segmented standard image; feature points detected by operator, with these as centers, select ed ; finally best in dealt target f ound calculate error . experiment results show that MeanShift is not sensitive texture of fabric so good for it. And t he accuracy speed...

In this paper, an extracorporeal shock wave source composed of small ellipsoidal sparker units is described. The were arranged in array designed to produce a coherent sufficient strength fracture kidney stones. objective paper was measure the acoustical output 18 individual and compare commercial lithotripters. Representative waveforms acquired with fiber-optic probe hydrophone at geometric focus indicated that produces (P+ ∼40–47 MPa, P− ∼2.5–5.0 MPa) similar waves produced by Dornier HM-3...

KyberKEM is one of the final round key encapsulation mechanisms in NIST post-quantum cryptography competition. Number theoretic transform (NTT), as computing bottleneck KyberKEM, has been widely studied. Discrete Galois Transformation (DGT) a variant NTT that reduces length into half but requires more multiplication operations than latest algorithm theoretical analysis. This paper proposes split-radix DGT, novel DGT utilizing method, to reduce complexity without compromising length....

The air volume fraction (AVF) of a sea foam layer is key parameter that affects the microwave emissivity and brightness temperature surface. To extract AVF from measured data at frequencies, novel retrieval method developed based on spectral representation effective dielectric constant composites media, with constituents geometry microstructure included in function. In method, cost function constructed two constraints: one first moments other derived coated spherical composites. We tested...

Ho 3+ /Yb co-doped zincate Ba 5 Gd 8 Zn 4 O 21 nanophosphors were successfully synthesized by solid-state reaction. The crystal structure and phase purity measured X-ray diffraction (XRD) the luminescence spectra CIE chromaticity investigated. results show that upconversion (UC) intensities are heavily dependent on rare-earth dopant concentration but emission colors almost same. Both green red UC emissions under 980 nm excitation shown to be two-photon processes independent of doping...

Electrical discharge machining (EDM) is a nontraditional method by using pulsed spark between workpiece and electrode to melt remove metal. The traditional power supply uses carbon brush slip ring. This contact type has at the point. Problems such as deposition, leakage, easy generation of electric sparks restrict improvement rotation speed pose safety hazard. non-contact technology based on principle electromagnetic induction can effectively solve above problems, which provide conditions...

Electrical discharge machining (EDM) is a nontraditional method by using pulsed spark between workpiece and electrode to melt remove metal. The traditional power supply uses carbon brush slip ring. This contact type has at the point. Problems such as deposition, leakage, easy generation of electric sparks restrict improvement rotation speed pose safety hazard. non-contact technology based on principle electromagnetic induction can effectively solve above problems, which provide conditions...

Lattice-based cryptography (LBC) has been established as a prominent research field, with particular attention on post-quantum (PQC) and fully homomorphic encryption (FHE). As the implementing bottleneck of PQC FHE, number theoretic transform (NTT) extensively studied. However, current works struggled scalability, hindering their adaptation to various parameters, such bit width polynomial length. In this article, we proposed novel Discrete Galois Transformation (DGT) algorithm utilizing...