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A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency

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Light(Science & Applications) 2024年第1期13卷 91-102页

作者： Weipeng Zhang Joshua C.Lederman Thomas Ferreira de Lima Jiawei Zhang Simon Bilodeau Leila Hudson alexander Tait Bhavin J.Shastri Paul R.Prucnal Department of Electrical and Computer Engineering Princeton UniversityPrinceton08544NJUSA nEC Laboratories America Princeton08540NJUSA Department of Electrical and Computer Engineering Queen’s UniversityKingstonK7L 3N6OntarioCanada Department of Physics Engineering Physics and AstronomyQueen’s UniversityKingstonK7L 3N6OntarioCanada

Radio-frequency interference is a growing concern as wireless technology advances,with potentially life-threatening consequences like interference between radar altimeters and 5 G cellular *** transceivers mix signals with varying ratios over time,posing challenges for conventional digital signal processing(DSP)due to its high *** challenges will worsen as future wireless technologies adopt higher carrier frequencies and data ***,conventional DSPs,already on the brink of their clock frequency limit,are expected to offer only marginal speed *** paper introduces a photonic processor to address dynamic interference through blind source separation(BSS).Our system-on-chip processor employs a fully integrated photonic signal pathway in the analogue domain,enabling rapid demixing of received mixtures and recovering the signal-of-interest in under 15 *** reduction in latency surpasses electronic counterparts by more than three orders of *** complement the photonic processor,electronic peripherals based on field-programmable gate array(FPGA)assess the effectiveness of demixing and continuously update demixing weights at a rate of up to 305 *** compact setup features precise dithering weight control,impedance-controlled circuit board and optical fibre packaging,suitable for handheld and mobile *** experimentally demonstrate the processor’s ability to suppress transmission errors and maintain signal-to-noise ratios in two scenarios,radar altimeters and mobile *** work pioneers the real-time adaptability of integrated silicon photonics,enabling online learning and weight adjustments,and showcasing practical operational applications for photonic processing.

关键词： processor mixing dynamic

Emerging use of artificial intelligence in inflammatory bowel disease

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World Journal of Gastroenterology 2020年第44期26卷 6923-6928页

作者： Arushi Kohli Erik A Holzwanger alexander n Levy Department of Internal Medicine Tufts Medical CenterBostonMA 02111United States Division of Gastroenterology and Hepatology Tufts Medical CenterBostonMA 02111United States

Inflammatory bowel disease(IBD)is a complex,immune-mediated gastrointestinal disorder with ill-defined etiology,multifaceted diagnostic criteria,and unpredictable treatment *** in IBD diagnostics,including developments in genomic sequencing and molecular analytics,have generated tremendous interest in leveraging these large data platforms into clinically meaningful *** intelligence,through machine learning facilitates the interpretation of large arrays of data,and may provide insight to improving IBD *** potential applications of machine learning models are vast,further research is needed to generate standardized models that can be adapted to target IBD populations.

关键词： Artificial intelligence Machine learning Automated diagnostics Colorectal neoplasia screening Multiomic data Predictive models

Surgical management of necrotizing pancreatitis:An overview

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World Journal of Gastroenterology 2014年第43期20卷 16106-16112页

作者： George Kokosis alexander Perez Theodore n Pappas Department of Surgery Duke University Medical CenterDurhamNC 27705United States

necrotizing pancreatitis is an uncommon yet serious complication of acute pancreatitis with mortality rates reported up to 15%that reach 30%in case of *** open surgical debridement was the only tool in our disposal to manage this serious clinical *** approach is however associated with poor *** has now shifted away from open surgical debridement to a more conservative management and minimally invasive *** approach to patients with necrotizing pancreatitis and/or infectious pancreatitis is summarized in the 3Ds:Delay,Drain and *** can be managed in the intensive care unit and any intervention should be *** drainage can be utilized first and early in the course of the disease,followed by endoscopic drainage or video assisted retroperitoneoscopic drainage if necrosectomy is deemed *** surgery is now less frequently performed and should be reserved for cases refractory to any other *** management of necrotizing pancreatitis therefore requires a multidisciplinary dynamic model of approach rather than being a surgical disease.

关键词： necrotizing pancreatitis Severe acute pancreatitis Debridement necrosectomy Infected necrosis Endoscopic necrosectomy Video-assisted retroperitoneal debridement Percutaneous catheter drainage

Dielectric tunability of magnetic properties in orthorhombic ferromagnetic monolayer CrSBr

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npj Computational Materials 2023年第1期9卷 1514-1523页

作者： alexander n.Rudenko Malte Rösner Mikhail I.Katsnelson Radboud University Institute for Molecules and MaterialsHeijendaalseweg 1356525AJ NijmegenThe Netherlands

Monolayer CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with a Curie temperature of around 146 *** contrast to many other known 2D magnets,the orthorhombic lattice of CrSBr gives rise to spatial anisotropy of magnetic excitations within the 2D *** magnetic anisotropy and considerable magnetic dipolar interactions in CrSBr challenge its theoretical description in terms of spin ***,we employ a Green’s function formalism combined with first-principles calculations to study the magnetic properties of monolayer CrSBr in different regimes of surrounding dielectric *** the free-standing limit,the system is close to an easy-plane magnet,whose long-range ordering is partially *** the contrary,in the regime of large external screening,monolayer CrSBr behaves like an easy-axis ferromagnet with more stable magnetic *** findings suggest that anisotropic layered magnets form a potentially promising platform for studying the effects of substrate screening on magnetic ordering in 2D.

关键词： monolayer orthorhombic anisotropy

Effects of site preparation methods on soil physical properties and outplanting success of coniferous seedlings in boreal forests

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On Some Results in the Theory of Finite Partially Soluble Groups

林业研究（英文版） 2024年第2期 74页

作者： Aleksey S.Ilintsev Elena n.nakvasina alexander P.Bogdanov

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Communications in Mathematics and Statistics 2016年第3期4卷 281-309页

作者： alexander n.Skiba Department of Mathematics Francisk Skorina Gomel State University246019 GomelBelarus

This article provides an overview of some recent results and ideas relatedto the study of finite groups depending on the restrictions on some systems of *** particular,we discuss some properties of the lattice of all subgroups ofa finite group related with conditions of permutability and generalized subnormality for *** paper contains more than 30 open problems which were posed,atdifferent times,by some mathematicians working in the discussed direction.

关键词： Finite group.Subgroup lattice.G-covering subgroup system.I1-subnormal subgroup o-nilpotent group

Low-altitude geophysical magnetic prospecting based on multirotor UAV as a promising replacement for traditional ground survey

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Geo-Spatial Information Science 2018年第1期21卷 67-74页

作者： alexander V.Parshin Vladimir A.Morozov Anton V.Blinov Alexey n.Kosterev alexander E.Budyak Ore Geology Lab Vinogradov Institute of Geochemistry SB RASIrkutskRussia SibGISTech LLC MarkovaRussia Geoinformatics Lab Irkutsk National Research Technical UniversityIrkutskRussia

The prospects for expanding the mineral resource base in many countries are linked with the exploration of stranded sites localized at unexplored areas with complex natural and landscape conditions that make any ground survey,including magnetic prospecting,difficult and *** current level of geology requires high-precision and large-scale data at the first stages of geological *** 2012,technologies of aeromagnetic surveying with unmanned aircraft vehicles(UAV)enter the market,but most of them are based on big fixed-wing UAV and do not allow to substantially increase the level of survey granularity compared with traditional aerial *** increase the scale of survey,it is necessary to reduce the altitude and speed of flight,for which the authors develop the methodical and technical solutions described in this *** obtain data at altitudes of 5 m above the terrain even in a rugged relief,we created heavy multirotor UAVs that are stable in flight and may be used in a wide range of environmental conditions(even a moderate snowfall),and develop a special software to generate flight missions on the basis of digital elevation models.A UAV has special design to reduce magnetic interference of the flight platform;the magnetic sensor is hung below the *** technology was conducted in a considerable amount of magnetic surveys in the mountainous regions of East Siberia between 2014 and *** results of the comparison between airborne and ground surveys are presented,which show that the sensitivity of the developed system in conjunction with low-altitude measurements can cover any geologically significant anomalies of the magnetic *** unmanned survey is cheaper and more productive;the multirotor-based technologies may largely replace traditional ground magnetic exploration in scales of 1:10,000−1:1000.

关键词： Unmanned aircraft vehicles(UAV) magnetic survey geophysical prospecting airborne geophysics unmanned aerial system(UAS)

Finite Groups of Spencer Height ≤ 3

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Algebra Colloquium 2015年第3期22卷 437-444页

作者： Wenbin Guo Dina P. Andreeva alexander n. Skiba School of Mathematical SciencesUniversity of Science and Technology of China Hefei 230026 China Department of Mathematics Francisk Skorina Gomel State University Gomel 246019 Belarus

In this paper, we describe the finite groups G in which every maximal chain M3 〈 M2 〈 M1 〈 M0 = G contains a proper subnormal subgroup of G.

关键词： finite group subnormal subgroup maximal chain Spencer height Schmidt group

FLOW PROPERTIES OF A DUSTY-GAS POInT SOURCE In A SUPERSOnIC FREE STREAM

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Applied Mathematics and Mechanics(English Edition) 2003年第8期24卷 928-935页

作者：王柏懿 alexander n.Osiptsov Misha A.Teverovshii LnM Institute of Mechanics Chinese Academy of SciencesBeijing 100080 P.R.China Institute of Mechanics Lomonosov Moscow State UniversityMoscow 119899 Russia Institute of Mechanics Lomonosov Moscow State UniversityMoscow 119899 Russiay using Lagrangian method the flow properties of a dusty-gas point source in a supersonic free stream were studied and the particle parameters in the near-symmetry-axis region were obtained . It is demonstrated that fairly inertial particles travel along oscillating and intersecting trajectories between the bow and termination shock waves . In this region formation of " mufti- layer structure" in panicle distribution with alternating low- and high density layers is revealed. Moreover sharp accumulation of particles occurs near the envelopes of particle trajectories .

By using Lagrangian method, the flow properties of a dusty-gas point source in a supersonic free stream were studied and the particle parameters in the near-symmetry-axis region were obtained . It is demonstrated that fairly inertial particles travel along oscillating and intersecting trajectories between the bow and termination shock waves . In this region, formation of ' mufti- layer structure' in panicle distribution with alternating low- and high density layers is revealed. Moreover, sharp accumulation of particles occurs near the envelopes of particle trajectories .

关键词： dusty gas supersonic flow point source particle inertia trajectory intersection multi-layer structure