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作者： William h.frey

＜正＞美国人口普查局刚刚公布了在2020年人口普查前的最后一批种族-族裔人口估计数,数据显示,全国总人数将显示出一个比先前预期更加多元化的国家。新的估计显示,近四成的美国人认同白人以外的族裔或种族,并暗示2010年至2020年将是美...

＜正＞美国人口普查局刚刚公布了在2020年人口普查前的最后一批种族-族裔人口估计数,数据显示,全国总人数将显示出一个比先前预期更加多元化的国家。新的估计显示,近四成的美国人认同白人以外的族裔或种族,并暗示2010年至2020年将是美国历史上第一个白人人口减少的十年。

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1996年聚合物化学进展

高分子通报 1997年第4期 249-257页

作者： h.frey J.Kressler W.Richtering R.Mülhaupt

ThEMIS observations of two substorms on February 26,2008

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Science China(Technological Sciences) 2010年第5期53卷 1328-1337页

作者： ChU XiangNing PU ZuYin CAO Xin WANG Jue V.MIShIN V.ANGELOPOULOS LIU Jiang WEI Yong K.h.GLASSMEIER J.MCFADDEN D.LARSON S.MENDE h.frey C.T.RUSSELL I.MANN D.SIBECK ZONG QiuGang FU SuiYan XIE Lun T.I.SAIFUDINOVA M.V.TOLOChKO L.A.SAPRONOVA h.REME E.LUCEK School of Earth and Space Sciences Peking UriiversityBeijing 100871China Institute of Solar-Terrestrial Physics Russian Academy of Sciences IGPP UCLA Instiute of Geophysics and Extraterrestrial Physics Technical University of BraunschweigBraunschweig and Max Planck Institute of Solar System Research Space Sciences Laboratory University of California Department of Physics University of Alberta Code 674 NASA/GSFC Centre d'Etude Spatiale des Rayonnements Blackett Laboratory Imperial College London

Two substorms occurred at ～04:05 and ～04:55 UT on February 26,2008 are studied with the in-situ observations of ThEMIS satellites and ground-based aurora and magnetic field *** et *** made a comprehensive study of the 04:55 UT *** showed detailed features of the two substorms with much attention to the first event and to the rela-tionship between mid-tail magnetic reconnection(MR) and substorm *** was found that in the earlier stage of each substorm,a first auroral intensification occurred 2-3 min soon after the start of mid-tail MR,followed by a slow and very lim-ited *** auroral arcs were weak,short-lived,and localized,characterizing all features of a *** re-garded the first auroral brightening as the initial onset of the substorms.A few minutes later,a second stronger auroral intensification appeared,followed by quick and extensive *** was interesting to note that the second brightening and related poleward expansion happened almost simultaneously(within a couple of minutes) with the onset of earthward flow and dipolarization in the near-Earth tail and other phenomenon of the substorm expansion *** thus regarded the second auroral brightening as the major onset of the ***,it was seen that during the growth phase of the two substorms,the polar cap open flux Ψ kept increasing,while it quickly reduced during the substorm expansion and recovery *** variations of Ψ implied that the evolution of the two substorm expansion phases were closely related to MR of tail lobe open field *** of substorm activities revealed that the two events studied were small substorms;while estimate of MR rate indicated that the MR processes in the two substorms were *** aforementioned observations suggested that mid-tail MR initiated the pseudobreakup first;the earthward flow generated by MR transported magnetic flux and energy to the near-Earth tail to cause the formatio

关键词： substorm auroral intensification/brightening auroral expansion dipolarization magnetic reconnection

ThEMIS星座对2008年2月26日磁层亚暴的观测--磁尾重联触发的亚暴分析研究

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中国科学：技术科学 2010年第5期40卷 565-574页

作者：褚项宁濮祖荫曹馨 V.MIShIN 王珏魏勇宗秋刚傅绥燕谢伦 V.ANGELOPOULOS 刘江 K.h.GLASSMEIER J.MCFADDEN D.LARSON S.MENDE h.frey C.T.RUSSELL I.MANN D.SIBECK T.I.SAIFUDINOVA M.V.TOLOChKO L.A.SAPRONOVA h.REME E.LUCEK 北京大学地球与空间科学学院北京100871 Institute of Solar-Terrestrial Physics Russian Academy of SciencesIrkutskRussia IGPP UCLALos AngelesCalifomiaUSA Instiute of Geophysics and Extraterrestrial Physics Technical University of BraunschweigBraunschweig and Max Planck Institute of SolarSystem ResearchKatlenburg-LindauGermany Space Sciences Laboratory University of CaliforniaBerkeleyCaliforniaUSA Department of Physics University of AlbertaEdmontonAlbertaCanada Code 674 NASA/GSFCGreenbeltMDUSA Centre d'Etude Spatiale des Rayonnements ToulouseFrance Blackett Laboratory Imperial College LondonLondonUK

本文利用ThEMIS卫星结合地面极光和地磁的观测,研究了2008年2月26日04:05和04:55UT的两次亚暴事件.Angelopoulos已经对发生在04:55UT的第二个亚暴事件做了分析.本文对两次亚暴的相关活动进行了详细研究,特别对第一次做了深入讨论,并着... 详细信息

本文利用ThEMIS卫星结合地面极光和地磁的观测,研究了2008年2月26日04:05和04:55UT的两次亚暴事件.Angelopoulos已经对发生在04:55UT的第二个亚暴事件做了分析.本文对两次亚暴的相关活动进行了详细研究,特别对第一次做了深入讨论,并着重分析了磁重联与亚暴活动的关系.在两次亚暴的初始阶段,第一次极光增亮发生在中磁尾磁重联后2～3min,但是持续时间较短,极向膨胀缓慢,与伪暴的特征相似,标志了亚暴的初突发(initial onset).两次亚暴都存在第二次极光增亮和极光的极向膨胀,且时间与近地磁尾观测的地向流和磁场偶极化同时发生,并与亚暴膨胀相的其他活动的发生同步,标志了亚暴的主突发(major onset).在两次亚暴的增长相期间,极盖区开放磁通量持续增加;在亚暴膨胀相和恢复相中,极盖区磁通量迅速减少.表明两次亚暴膨胀相的演化分别与两次尾瓣开放磁力线重联过程相联系的.从亚暴活动的参数分析,这两次亚暴都属于小亚暴范围;从重联率分析,两次磁重联都属于弱重联.本文的观测结果表明,中磁尾磁尾重联首先触发伪暴;高速流将磁通量和能量传输到近地磁尾;高速流减速最终导致亚暴电流楔(substorm current wedge,简称SCW)的形成和电流中断,产生近地偶极化和极光膨胀,引起亚暴膨胀相突发.本文的观测结果是对近地中性线模型(near earth neutral line,简称NENL)和重联-电流中断协同模型(synthesis scenario of MR and CD,简称RCS)模型及亚暴膨胀相两步突发观点的有力支持.

关键词：亚暴极光增亮极光膨胀磁场偶极化磁重联

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手移植术:重塑脑手连接

环球科学 2021年第1期 46-53页

作者：斯科特·h·弗雷石自清(翻译) 徐宁龙(审校) 密苏里-哥伦比亚大学中国科学院脑科学与智能技术卓越创新中心

一些接受手移植术的人能迅速适应他们的新手,这些意料之外的案例为科学家揭示了神经系统惊人的适应性。1964年2月,在厄瓜多尔的瓜亚基尔(Guayaquil)市,曾在梅奥诊所(Mayo Clinic)研习的外科医生罗伯托·希尔韦特·埃利萨尔德(Roberto Gi... 详细信息

一些接受手移植术的人能迅速适应他们的新手,这些意料之外的案例为科学家揭示了神经系统惊人的适应性。1964年2月,在厄瓜多尔的瓜亚基尔(Guayaquil)市,曾在梅奥诊所(Mayo Clinic)研习的外科医生罗伯托·希尔韦特·埃利萨尔德(Roberto Gilbert Elizalde)正在筹谋自己实验室开发的激进疗法。他遇见了胡利奥·卢纳(Julio Luna),--位因手榴弹爆炸失去右手的28岁水手。当时,美国的供体肾移植手术正名声大噪,希尔韦特·埃利萨尔德受到启发,想要用他人捐赠的手来替代卢纳的右手。

关键词：肾移植手术移植术梅奥诊所 Gilbert 希尔外科医生瓜亚基尔韦特

Fast jet proper motion discovered in a blazar at z=4.72

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Science Bulletin 2020年第7期65卷 525-530,M0003页

作者： Yingkang Zhang Tao An Sándor frey Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China Konkoly Observatory Research Centre for Astronomy and Earth SciencesKonkoly Thege Miklósút 15-17H-1121 BudapestHungary

high-resolution observations of high-redshift(z > 4) radio quasars offer a unique insight into jet kinematics at early cosmological epochs, as well as constraints on cosmological model *** to the general weakness of extremely distant objects and the apparently slow structural changes caused by cosmological time dilation, only a couple of high-redshift quasars(hRQs) have been studied with parsec-scale resolutions, and with limited number of observing epochs. here we report on very long baseline interferometry(VLBI) observations of a high-redshift blazar J1430 + 4204(z=4.72) in the 8 Ghz frequency band at five different epochs spanning 22 years. The source shows a compact core–jet structure with two jet components being identified within 3 milli-arcsecond(mas) scale. The long time span and multiple-epoch data allow for the kinematic studies of the jet components. That results in a jet proper motion of μ(J1) = 0.017 ± 0.002 mas a^-1 and μ(J2) = 0.156 ± 0.015 mas a^-1, respectively. For the fastest-moving outer jet component J2, the corresponding apparent transverse speed is (19.5 ± 1.9) *** inferred bulk jet Lorentz factor C=14.6 ± 3.8 and viewing angle θ=2.2°± 1.6°indicate highly relativistic beaming. The Lorentz factor and apparent proper motion are the highest measured to date among the z > 4 jetted radio sources, while the jet kinematics is still consistent with the cosmological interpretation of quasar redshifts.

关键词： Nuclei high-redshift Radio continuum Quasars Individual J1430+4204

Impact of dental clearance on total joint arthroplasty: A systematic review

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World Journal of Orthopedics 2019年第12期10卷 416-423页

作者： Christopher frey Sergio M Navarro Terri Blackwell Carla Lidner h Del Schutte Jr Department of Orthopedic Surgery Stanford MedicineRedwood CityCA 94063United States Department of Surgery Baylor College of MedicineHoustonTX 77030United States Said School of Business University of Oxford Oxford OX11HPUnited Kingdom Comprehensive Joint Program Charleston Institute for Advanced OrthopedicsCharlestonSC 29464United States Dentistry Orange County Dental SocietyOrangeCA 92868United States

Many orthopedic surgeons require that their patients obtain dental clearance before elective total joint arthroplasty(TJA).however,there is no consensus substantiating the *** this end,a systematic review on the prevalence of dental pathology in TJA patients,risk factors for failing dental screening,and impact of dental evaluations was *** was sourced from PubMed and Scopus *** papers were sourced from the initial search,one study was extracted from the references of the original six manuscripts,and one new publication was retrieved from a second search conducted after the *** prevalence of dental pathology ranged from 8.8%to 29.4%across *** of four papers reported lower than average or improvements in postoperative infection with pre-operative dental evaluations while two found no such *** is insufficient evidence to support universal dental clearance before TJA.

关键词： Total knee arthroplasty Total hip arthroplasty Total joint arthroplasty Periprosthetic joint infection Dental screening

An Update on Abscisic Acid Signaling in Plants and More

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Molecular Plant 2008年第2期1卷 198-217页

作者： Aleksandra Wasilewsk.a Florina Vlad Caroline Sirichandra Yulia Redko Fabien Jammes Christiane Valon Nicolas Frei dit frey Jeffrey Leung Institut des Sciences du Vegetal Centre National de la Recherche Scientifique UPR 23551 Avenue de la Terrasse Bat. 23 91190 Gif-sur-Yvette France CNRS UPR9073 Institut de Biologie Physico-Chimique 13 rue Pierre et Marie Curie 75005 Paris France Laboratoire Signalisation et Regulation Coordonnee du Metabolisme Carbone et Azote Institut de Biotechnologie des Plantes (UMR8618) Universite Paris-Sud F-91405 Orsay Cedex France

The mode of abscisic acid （ABA） action, and its relations to drought adaptive responses in particular, has been a captivating area of plant hormone research for much over a decade. The hormone triggers stomatal closure to limit water loss through transpiration, as well as mobilizes a battery of genes that presumably serve to protect the cells from the ensuing oxidative damage in prolonged stress. The signaling network orchestrating these various responses is, however, highly complex. This review summarizes several significant advances made within the last few years. The biosynthetic pathway of the hormone is now almost completely elucidated, with the latest identification of the ABA4 gene encoding a neoxanthin synthase, which seems essential for de novo ABA biosynthesis during water stress. This leads to the interesting question on how ABA is then delivered to perception sites. In this respect, regulated transport has attracted renewed focus by the unexpected finding of a shoot-to-root translocation of ABA during drought response, and at the cellular level, by the identification of a B-galactosidase that releases biologically active ABA from inactive ABA-glucose ester. Surprising candidate ABA receptors were also identified in the form of the Flowering Time Control Protein A （FCA） and the Chloroplastic Magnesium Protoporphyrin-IX Chelatase h subunit （ChLh） in chloroplast-nucleus communication, both of which have been shown to bind ABA in vitro. On the other hand, the protein（s） corresponding to the physiologically detectable cell-surface ABA receptor（s） is （are） still not known with certainty. Genetic and physiological studies based on the guard cell have reinforced the central importance of reversible phosphorylation in modulating rapid ABA responses. Sucrose Non-Fermenting Related Kinases （SnRK）, Calcium-Dependent Protein Kinases （CDPK）, Protein Phosphatases （PP） of the 2C and 2A classes figure as prominent regulators in this single-cell model. Identifying their d

关键词： Abscisic Acid Signaling Plants and More

Substorm onset of near-earth magnetotail origin observed by coordinated satellites and ground-based observations

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Substorm onset of near-earth magnetotail origin observed by ...