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10篇 您的检索式:作者名="B.U"
    题名 作者 年代 出处 被引量
1Conduction deficits of callosal fibres in early multiple sclerosis显示文摘Schmierer K Niehaus L R(o)richt S Meyer B.U 0,,:1
2Dehydration/recrystallization mechanisms, energetics, and kinetics of hydrated calcium silicate minerals: an in situ TGA/DSC and synchrotron radiation SAXS/WAXS study显示文摘S Shaw C.M.B Henderson B.U Komanschek 2000Chemical Geology2000,,1:1
3Mutations Involving the Transcription Factor CBFA1 Cause Cleidocranial Dysplasia显示文摘S Mundlos F Otto C Mundlos J.B Mulliken A.S Aylsworth S Albright D Lindhout W.G Cole W Henn J.H.M Knoll M.J Owen R Mertelsmann B.U Zabel B.R Olsen 1997Cell1997,,5:1
4Spectrally resolved Hong-Ou-Mandel interferometry for quantum-optical coherence tomography显示文摘In this paper,we revisit the well-known Hong_Ou-Mandel(HOM)effect in which two photons,which meet at a beamsplitter,can interfere destructively,leading to null in coincidence counts.In a standard HOM measurement,the coincidence counts across the two output ports of the beamsplitter are monitored as the temporal delay be-tween the two photons prior to the beamsplitter is varied,resulting in the well-known HOM dip.We show,both theoretically and experimentally,that by leaving the delay fixed at a particular value while relying on spectrally resolved coincidence photon counting,we can reconstruct the HOM dip,which would have been obtained through a standard delay-scanning,non-spectrally resolved HOM measurement.We show that our numerical reconstruction procedure exhibits a novel dispersion cancellation effect,to all orders.We discuss how our present work can lead to a drastic reduction in the time required to acquire a HOM interferogram,and specifically discuss how this could be of particular importance for the implementation of fficient quantum optical coherence tomog-raphy devices.PABLO YEPIZ-GRACIANO ALI MICHEL ANGULO MARTINEZ DORILIAN LOPEZ-MAGO HECTOR CRUZ-RAMIREZ ALFRED B.U'REN 2020Photonics Research2020,8,6:1
5Chronology of Fluctuating Sea Levels since the Triassic显示文摘Haq B.U Hardenbol J Vail P.R 0,,:1
6Experimental demonstration of full-field quantum optical coherence tomography显示文摘We present,to the best of our knowledge,the first implementation of full-field quantum optical coherence tomography(FF-QOCT).In our system,we are able to obtain full three-dimensional(3D)information about the internal structure of a sample under study by relying on transversely resolved Hong–Ou–Mandel(HOM)interferometry with the help of an intensified CCD(ICCD)camera.Our system requires a single axial scan,obtaining full-field transverse single-photon intensity in coincidence with the detection of the sibling photon for each value of the signal-idler temporal delay.We believe that this capability constitutes a significant step forward toward the implementation of QOCT as a practical biomedical imaging technique.ZEFERINO IBARRA-BORJA CARLOS SEVILLA-GUTIéRREZ ROBERTO RAMíREZ-ALARCóN HECTOR CRUZ-RAMíREZ ALFRED B.U'REN 2020Photonics Research2020,8,1:1
7Mutations Involving the Transcription Factor CBFA1 Cause Cleidocranial Dysplasia显示文摘S Mundlos F Otto C Mundlos J.B Mulliken A.S Aylsworth S Albright D Lindhout W.G Cole W Henn J.H.M Knoll M.J Owen R Mertelsmann B.U Zabel B.R Olsen 1997Cell1997,,5:1
8俄罗斯森林采运机械的发展趋势显示文摘本文以介绍俄罗斯采运专家如何看待俄国采运机械的发展趋势为中心,向读者传达一个信息,即在苏联解体后出现于俄罗斯的一个社会现象——普遍的反思和对过去的全盘否定。这种现象不仅存在于政治生活,也存在于经济和科学技术领域。中国同行带着很大的兴趣观察和研究这一反思,但显不急于给出自己的评价。俄国专家的分析主要建立在机械的自重上,而又没有明确的重量界限,即多大的自重才有害于森林的恢复。俄国专家十分依重所谓的“斯堪的那维亚工艺”,而又缺少对这种工艺形成的环境的分析。而每种工艺和技术又绝不能脱离它自身依懒的环境,自然的、经济的、乃至社会的环境。当然,一篇短文不可能面面具到。本文所反映的一个侧面仍然是有趣的。应当引起大家的注意,乃至讨论。斯诗里欣B.U 李云成 1994森林采运科学1994,10,3:0
9Submegahertz spectral width photon pair source based on fused silica microspheres显示文摘High-efficiency submegahertz bandwidth photon pair generators will enable the field of quantum technology to transition from laboratory demonstrations to transformational applications involving information transfer from photons to atoms.While spontaneous parametric processes are able to achieve high-efficiency photon pair generation,the spectral bandwidth tends to be relatively large,as defined by phase-matching constraints.To solve this fundamental limitation,we use an ultrahigh quality factor(Q)fused silica microsphere resonant cavity to form a photon pair generator.We present the full theory for the spontaneous four-wave mixing(SFWM)process in these devices,fully taking into account all relevant source characteristics in our experiments.The exceptionally narrow(down to kilohertz-scale)linewidths of these devices result in a reduction in the bandwidth of the photon pair generation,allowing submegahertz spectral bandwidth to be achieved.Specifically,using a pump source centered around 1550 nm,photon pairs with the signal and idler modes at wavelengths close to 1540 and 1560 nm,respectively,are demonstrated.We herald a single idler-mode photon by detecting the corresponding signal photon,filtered via transmission through a wavelength division multiplexing channel of choice.We demonstrate the extraction of the spectral profile of a single peak in the single-photon frequency comb from a measurement of the signal–idler time of emission distribution.These improvements in device design and experimental methods enabled the narrowest spectral width(Δν=366 k Hz)to date in a heralded single-photon source based on SFWM.ERASTO ORTIZ-RICARDO CESAR BERTONI-OCAMPO MONICA MALDONADO-TERRON ARTURO GARCIA ZURITA ROBERTO RAMIREZ-ALARCON HECTOR CRUZ RAMIREZ R.CASTRO-BELTRAN ALFRED B.U’REN 2021Photonics Research2021,9,11:0
10Effects of Different Combinations of Two Spices:Clove and Nutmeg Seed Extracts on Antioxidants Levels in African Catfish(Clarias gariepinus)显示文摘The effect of different combinations of botanical spices such as clove and nutmeg in different proportion on the antioxidants activities which include lipid peroxidation(LPO),superoxide dismutase(SOD),catalase(CAT),glutathione-S-transferase(GST)and glutathione peroxide(GPX)in juveniles and adults sizes of Clarias gariepinus was investigated using different combinations of clove(C),and nutmeg(C.N 0:0-Control 0%of Clove and Nutmeg;C.N 1:3-25%Clove and 75%Nutmeg;C.N 3:1-75%Clove and 25%Nutmeg;C.N 2:2-50%Clove and 50%Nutmeg;C.4-100%Clove;N4-100%)in triplicates.The results from the study indicated that the anaesthetic caused a substantial(p<0.05)modifications in the five antioxidants under examination.The highest deviations in the studied antioxidants were observed in the fish exposed to C4 combination of the anaesthetics and the lowest in the control.The results from this work therefore suggest that the anaesthetics can alter antioxidants levels in the fish which was more noticeable in the fish exposed to C.N 3:1-75%Clove and 25%Nutmeg;C.N 2:2-50%Clove and 50%Nutmeg;C.4-100%Clove;N4-100%.Hence fish farmers and scientists are advised to take caution when combining these plant extracts for use in aquaculture.Akinrotimi O.A Okenwa U Stephen M.U Eze B.U Onwujiariri C.E 2021Journal of Fisheries Science2021,3,2:0
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