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Temporal scatterplots

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Computational Visual Media 2020年第4期6卷 385-400页

作者： Or Patashnik Min Lu Amit H.Bermano Daniel cohen-Or Tel-Aviv University Tel-AvivIsrael Shenzhen University ShenzhenChina

Visualizing high-dimensional data on a 2D canvas is generally *** becomes significantly more difficult when multiple time-steps are to be presented,as the visual clutter quickly ***,the challenge to perceive the significant temporal evolution is even *** this paper,we present a method to plot temporal high-dimensional data in a static scatterplot;it uses the established PCA technique to project data from multiple *** key idea is to extend each individual displacement prior to applying PCA,so as to skew the projection process,and to set a projection plane that balances the directions of temporal change and spatial *** present numerous examples and various visual cues to highlight the data trajectories,and demonstrate the effectiveness of the method for visualizing temporal data.

关键词： scatterplot temporal data visual clutter principle component analysis(PCA)

Surface acoustic wave photonic filters with a single narrow radio-frequency passband in standard silicon on insulator

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Photonics Research 2022年第7期10卷 1723-1730页

作者： MOSHE KATZMAN MAAYAN PRIEL inbar SHAFIR SAAWAN KUMAR BAG DVIR MUNK NAOR inbar MOSHE FELDBERG TALI SHARABANI LEROY DOKHANIAN MATAN SLOOK AVI ZADOK Faculty of Engineering Bar-Ilan UniversityRamat-Gan 5290002Israel Institute for Nano-Technology and Advanced Materials Bar-Ilan UniversityRamat-Gan 5290002Israel Soreq NRC Yavne 81800Israel Tower Semiconductors Migal Ha’Emek 2310502Israel

Integrated microwave photonic filters are becoming increasingly important for signal processing within advanced wireless and cellular *** with narrow transmission passbands mandate long time delays,which are difficult to accommodate within photonic *** delays may be obtained through slow moving acoustic waves *** radio-frequency information can be converted from one optical carrier to another via surface acoustic waves and filtered in the ***,the transfer functions of previously reported devices consisted of multiple periodic passbands,and the selection of a single transmission band was not *** this work,we demonstrate surface acoustic wave,silicon-photonic filters of microwave frequency with a single transmission *** filter response consists of up to 32 tap coefficients,and the transmission bandwidth is only7 *** results extend the capabilities of integrated microwave photonics in the standard silicon-on-insulator platform.

关键词： filters pass microwave

Strangers and Migrants in the Making of African Societies:A Conceptual and Historical Review

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Fudan Journal of the Humanities and Social Sciences 2019年第1期12卷 45-59页

作者： Robin cohen Kellogg College University of Oxford62 Banbury RdOxford 0X2 6PNUK

At the extremes,there are two forms of engagement with strangers—the anthropophagic,where outsiders are swallowed and digested,and the anthropoemic,where aliens are discarded,institutionalized,incarcerated or *** this dyad as a conceptual tool,I examine seven patterns of inclusion/exclusion in African societies,covering early agricultural societies,the formation of kingdoms,societies formed by refugees,strangers in pre-colonial cities,migrants in colonial cities,ethnic expulsions as a result of modem state formation and migrants in contemporary global *** aim of the article,based on an extensive review of secondary literature,is to add historical,comparative and typological elements to an often inadequate sociological and anthropological sensibility concerning hosts and strangers.

关键词： Strangers Migrants African state formation Expulsions African history

The promise of stem cell-based therapeutics in ophthalmology

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Neural Regeneration Research 2017年第2期12卷 173-180页

作者： Israel Aharony Shalom Michowiz Nitza Goldenberg-cohen The Krieger Eye Research Laboratory Felsenstein Medical Research CenterPetach TikvaIsraelSackler Faculty of MedicineTel Aviv UniversityTel AvivIsrael Department of Neurosurgery Rabin Medical Center-Beilinson HospitalPetach TikvaIsrael Department of Ophthalmology Bnai Zion Medical CenterHaifaIsrael

The promising role of cellular therapies in the preservation and restoration of visual function has prompted intensive efforts to characterize embryonic, adult, and induced pluripotent stem cells for regenerative purposes. Three main approaches to the use of stem cells have been described： sustained drug delivery, immunomodulation, and differentiation into various ocular structures. Studies of the differentiation capacity of all three types of stem cells into epithelial, neural, glial and vascular phenotypes have reached proof-of-concept in culture, but the correction of vision is still in the early developmental stages, and the requirements for effective in vivo implementation are still unclear. We present an overview of some of the preclinical findings on stem-cell rescue and regeneration of the cornea and retina in acute injury and degenerative disorders.

关键词： embryonic stem cells adult stem cells induced pluripotent stem cells cornea retina neuroprotection immunomodulation tissue recovery regeneration acute ocular injury degenerative retinal disorders

A hybrid Monte Carlo study of bond-stretching electron–phonon interactions and charge order in BaBiO_(3)

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npj Computational Materials 2023年第1期9卷 1950-1958页

作者： Benjamin cohen-Stead Kipton Barros Richard Scalettar Steven Johnston Department of Physics and Astronomy The University of TennesseeKnoxvilleTN 37996USA Institute for Advanced Materials and Manufacturing The University of TennesseeKnoxvilleTN 37996USA Theoretical Division and CNLS Los Alamos National LaboratoryLos AlamosNM 87545USA Department of Physics and Astronomy University of CaliforniaDavisCA 95616USA

The relationship between electron–phonon(e-ph)interactions and charge-density-wave(CDW)order in the bismuthate family of high-temperature superconductors remains *** address this question using nonperturbative hybrid Monte Carlo calculations for the parent compound BaBiO_(3).Our model includes the Bi 6s and O 2pσorbitals and coupling to the Bi-O bond-stretching branch of optical phonons via modulations of the Bi-O hopping *** simulate three-dimensional clusters of up to 4000 orbitals,with input model parameters taken from ab initio electronic structure calculations and a phonon energyℏΩ0=60 *** results demonstrate that the coupling to the bond-stretching modes is sufficient to reproduce the CDW transition in this system,despite a relatively small dimensionless *** also find that the transition deviates from the weak-coupling Peierls’*** work demonstrates that off-diagonal e-ph interactions in orbital space are vital in establishing the bismuthate phase diagram.

关键词： stretching phonon charge

PerfectlyMatched Layer withMixed Spectral Elements for the Propagation of LinearizedWaterWaves

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Communications in Computational Physics 2012年第2期11卷 285-302页

作者： Gary cohen Sebastien Imperiale INRIA Domaine de VoluceauRocquencourt-BP 10578153 Le Chesnay CedexFrance

After setting a mixed formulation for the propagation of linearized water waves problem,we define its spectral element ***,in order to take into account unbounded domains,we construct absorbing perfectly matched layer for the *** approximate these perfectly matched layer by mixed spectral elements and show their stability using the“frozen coefficient”***,numerical results will prove the efficiency of the perfectly matched layer compared to classical absorbing boundary conditions.

关键词： Linearized water waves perfectly matched layer mixed finite elements

Heat dissipation in graphene foams

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Nano Research 2021年第3期14卷 829-833页

作者： Yaniv cohen Siva K.Reddy Assaf Ya’akobovitz Department of Mechanical Engineering Faculty of Engineering SciencesBen-Gurion University of the NegevBeer-Sheva8410501Israel

Graphene foam(GF)—a three-dimensional network of hollow graphene branches—is a highly attractive material for diverse ***,to date,the heat dissipation characteristics of GFs have not been *** fill this gap,we synthesized GF devices,subjected them to high temperatures,and investigated their thermal behavior by using infrared *** find that while the convective area of GF devices is comparable to that of bulk materials(such as metals),the coefficient of convection of these devices is several orders of magnitude higher than that of *** addition,the GF devices showed a reproducible thermal behavior,which we attribute to negligible temperature-induced morphological changes(as confirmed by Raman analysis).Taken together,our findings suggest GF as a promising candidate material for advanced cooling applications where efficient heat dissipation is needed,e.g.,in electrical circuits.

关键词： convection graphene foam heat transfer

Oliver Wendell Holmes’1836 doctorate dissertation and his journey in medicine

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World Journal of Cardiology 2020年第8期12卷 362-367页

作者： Stafford I cohen Division of Cardiology Beth Israel Deaconess Medical Center and Harvard Medical SchoolMA 02215United States

Oliver Wendell Holmes’1836 hand written doctorate dissertation on acute pericarditis was discovered in the archives of the Boston Medical Library 101 years after it was successfully *** was then printed as an unabridged monograph with an explanation of its *** dissertation has received little scrutiny since *** gathered materials for the scholarly work while he was a third and fourth year student at Ecole de Medecine in *** mentor,Pierre-Charles-Alexandre-Louis insisted on the meticulous gathering and recording of every patient’s history and *** category of data was given a weighted numerical value of diagnostic importance and the information was placed in a *** became a disciple of Louis in gathering data by direct observation and measuring outcomes in a“statistical”*** dissertation on acute pericarditis describes the state of knowledge about the illness in the *** Holmes and other students who had studied in Paris returned to the United States,they helped turn American Medicine from opinion and strong personal bias toward scientific *** Wendell Holmes eventually became both a professor of anatomy/physiology and a dean at Harvard Medical *** is recognized as a leader in medicine and a popular author in America and *** his late and infirmed years,Holmes questioned the wisdom of his unswerving advocacy for the scientific underpinnings of *** retrospect he had overlooked the importance of also advocating that each patient be approached with comforting compassion.

关键词： Acute pericarditis Medical statistics Childbed fever Harvard medical school Pierre-Charles-Alexandre-Louis

Application of Geochemistry and VNIR Spectroscopy in Mapping Heavy Metal Pollution of Stream Sediments in the Takab Mining Area, NW of Iran

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2382-2394页

作者： Parisa PIROOZFAR Samad ALIPOUR Soroush MODABBERI David cohen Department of Geology Faculty of SciencesUrmia University School of Geology University of Tehran School of Biological Earth and Environmental SciencesNew South Wales University

This study considered the possibility of using visible and near infrared(VNIR) spectral absorption feature parameters(SAFPs) in predicting the concentration and mapping the distribution of heavy metals in sediments of the Takab area. In total, 60 sediment samples were collected along main streams draining from the mining districts and tailing sites, in order to measure the concentration of As, Co, V, Cu, Cr, Ni, Hg, Ti, Pb and Zn and the reflectance spectra(350–2500 nm). The quantitative relationship between SAFPs(Depth500 nm, R610/500 nm, R1344/778 nm, Area500 nm, Depth2200 nm, Area2200 nm, Asym2200 nm) and geochemical data were assessed using stepwise multiple linear regression(SMLR) and enter multiple linear regression(EMLR) methods. The results showed a strong negative correlation between Ni and Cr with Area2200 nm, a significant positive correlation between As and Asym2200 nm, Ni and Co with Depth2200 nm, as well as Co, V and total values with Depth500 nm. The EMLR method eventuated in a significant prediction result for Ni, Cr, Co and As concentrations based on spectral parameters, whereas the prediction for Zn, V and total value was relatively weak. The spatial distribution pattern of geochemical data showed that mining activities, along with the natural weathering of base metal occurrences and rock units, has caused high concentrations of heavy metals in sediments of the Sarough River tributaries.

关键词： heavy metals SAFPs VNIR spectroscopy multiple linear regression Takab Iran