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Ambient synthesis, characterization, and electrochemical activity of LiFePO4 nanomaterials derived from iron phosphate intermediates

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Nano Research 2015年第8期8卷 2573-2594页

作者： Jonathan M. Patete Megan E. scofield Vyacheslav Volkov Christopher Koenigsmann Yiman Zhang Amy C. Marschilok Xiaoya Wang Jianming Bai Jinkyu Han Lei Wang Feng Wang Yimei Zhu Jason A. Graetz stanislaus s. Wong Department of Chemistry State University of New York at Stony Brook Stony Brook NY 77794-3400 USA Condensed Matter Physics and Materials sciences Department Building 480 Brookhaven National Laboratory Upton NY 11973 USA Department of Materials science and Engineering State University of New York at Stony Brook Stony Brook NY 11794-2275 USA sustainable Energy Technologies Department Building 815 Brookhaven National Laboratory Upton NY 11973 USA National synchrotron Light source II Building 741 Brookhaven National Laboratory Upton NY 11973 USA

LiFePO4 materials have become increasingly popular as a cathode material due to the many benefits they possess including thermal stability, durability, low cost, and long life span. Nevertheless, to broaden the general appeal of this material for practical electrochemical applications, it would be useful to develop a relatively mild, reasonably simple synthesis method of this cathode material. Herein, we describe a generalizable, 2-step methodology of sustainably synthesizing LiFePO4 by incorporating a template-based, ambient, surfactantless, seedless, U-tube protocol in order to generate size and morphologically tailored, crystalline, phase-pure nanowires. The purity, composition, crystallinity, and intrinsic quality of these wires were systematically assessed using transmission electron microscopy （TEM）, high-resolution TEM （HRTEM）, scanning electron microscopy （sEM）, X-ray diffraction （XRD）, selected area electron diffraction （sAED）, energy dispersive analysis of X-rays （EDAX）, and high-resolution synchrotron XRD. From these techniques, we were able to determine that there is an absence of any obvious defects present in our wires, supporting the viability of our synthetic approach. Electrochemical analysis was also employed to assess their electrochemical activity. Although our nanowires do not contain any noticeable impurities, we attribute their less than optimal electrochemical rigor to differences in the chemical bonding between our LiFePO4 nanowires and their bulk-like counterparts. specifically, we demonstrate for the first time experimentally that the Fe-O3 chemical bond plays an important role in determining the overall conductivity of the material, an assertion which is further supported by recent ＂first-principles＂ calculations. Nonetheless, our ambient, solution-based synthesis technique is capable of generating highly crystalline and phase-pure energy-storage-relevant nanowires that can be tailored so as to fabricate different sized materials of repro

关键词： ambient synthesis template synthesis cathode material lithium iron phosphate nanostructures

Dosimetric Advantages of Volumetric Modulated Arc Therapy Based Coronal Arc Delivery Technique in Brain stereotactic Radiosurgery: A Feasibility study

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2019年第2期8卷 80-94页

作者： Gurtej s. Gill Raphael Y. Jakubovic Jameson Baker Terry Button Jenghwa Chang Department of Radiation Medicine Center for Advanced Medicine Northwell Health Lake Success NY USA Department of Radiology and Biomedical Engineering Stony Brook University Stony Brook NY USA

The feasibility of a volumetric modulated arc therapy (VMAT) based coronal arc (cARC) technique for treating a single brain metastasis or lesion proximal to the brainstem or optic chiasm was evaluated. Coplanar (CP) and non-coplanar (NCP) treatment plans to an anthropomorphic head/neck phantom scanned head-first supine were compared to a cARC plan with the phantom rotated vertically. A set of planning target volumes (PTVs) were contoured centrally between the brainstem and optic chiasm (“Ant PTVs”) and posterior to brainstem (“Post PTVs”). Dosimetric indices such as conformity index (C.I.), gradient measure (G.M.), and dose volume histograms (DVHs) were compared for CP, NCP and cARC techniques. The TG101 guidelines for organs-at-risk (OARs), and 95% of PTV receiving at least 100% of the prescription dose (D95 = 100%) were used as plan objectives. Reductions in D50 and D30 to the brainstem of 85.1% ± 3.9% and 87.6% ± 3.2%, respectively were seen for “Post PTVs”, and 51.1% ± 17.8% and 85.6% ± 6.0% respectively for “Ant PTVs” using cARC versus CP (p ≤ 0.01). For chiasm, reductions of D50 and D30 were 61.7% ± 3.2% and 44.2% ± 8.9% for “Ant PTVs”, by 69.3% ± 8.0% and 74.3% ± 8.2% for “Post PTVs” (p ≤ 0.01). Comparing cARC to NCP led to similar dosimetric improvements. The conformity index (C.I.) was measured to be 1.101 ± 0.038, 1.088 ± 0.054, and 1.060 ± 0.040 for cARC, CP and NCP respectively (p ≤ 0.01). The overall GM in cm was 0.581 ± 0.097, 0.708 ± 0.064, and 0.476 ± 0.050 for cARC, CP and NCP respectively (p ≤ 0.01). The mean distance gradient fall-off (in cm) was 0.249 ± 0.038 (cARC), 0.749 ± 0.107 (CP), and 0.621 ± 0.068 (NCP) at the center slice in anterior-posterior direction of the target volume (p ≤ 0.01). The objective of this study is to compare the dosimetric indices of cARC with CP and NCP techniques. In conclusion, cARC can provide improved dosimetry as compared to CP and NCP for lesion proximal to the brainstem or optic chiasm.

关键词： VMAT Coronal Arc π-Geometry Coplanar Non-Coplanar stereotactic Radiosurgery

search for two-neutrino double-beta decay of 136Xe to the 01+excited state of136Ba with the complete EXO-200 dataset

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Chinese Physics C 2023年第10期47卷 5-13页

作者： s.Al Kharusi G.Anton I.Badhrees P.s.Barbeau D.Beck V.Belov T.Bhatta M.Breidenbach T.Brunner G.F.Cao W.R.Cen C.Chambers B.Cleveland M.Coon A.Craycraft T.Daniels L.Darroch s.J.Daugherty J.Davis s.Delaquis A.Der Mesrobian-Kabakian R.De Voe J.Dilling A.Dolgolenko M.J.Dolinski J.Echevers W.Fairbank Jr. D.Fairbank J.Farine s.Feyzbakhsh P.Fierlinger Y.s.Fu D.Fudenberg P.Gautam R.Gornea G.Gratta C.Hall E.V.Hansen J.Hoessl P.Hufschmidt M.Hughes A.Iverson A.Jamil C.Jessiman M.J.Jewell A.Johnson A.Karelin L.J.Kaufman T.Koffas R.Krücken A.Kuchenkov K.s.Kumar Y.Lan A.Larson B.G.Lenardo D.s.Leonard G.s.Li s.Li Z.Li C.Licciardi Y.H.Lin R.Mac Lellan T.Mc Elroy T.Michel B.Mong D.C.Moore K.Murray O.Njoya O.Nusair A.Odian I.Ostrovskiy A.Perna A.Piepke A.Pocar F.Retière A.L.Robinson P.C.Rowson J.Runge s.schmidt D.sinclair K.skarpaas A.K.soma V.stekhanov M.Tarka s.Thibado J.Todd T.Tolba T.I.Totev R.Tsang B.Veenstra V.Veeraraghavan P.Vogel J.-L.Vuilleumier M.Wagenpfeil J.Watkins M.Weber L.J.Wen U.Wichoski G.Wrede s.X.Wu Q.Xia D.R.Yahne L.Yang Y.-R.Yen O.Ya.Zeldovich T.Ziegler EXO-200 Collaboration Physics Department McGill University Erlangen Centre for Astroparticle Physics (ECAP) Friedrich-Alexander-University Erlangen-Nürnberg Physics Department Carleton University King Abdulaziz City for science and Technology Department of Physics Duke University and Triangle Universities Nuclear Laboratory (TUNL) Physics Department University of Illinois Institute for Theoretical and Experimental Physics named by A.I.Alikhanov of National Research Centre “Kurchatov Institute” a division of National Research Center “Kurchatov Institute” Department of Physics University of South Dakota Department of Physics and Astronomy University of Kentucky sLAC National Accelerator Laboratory TRIUMF Institute of High Energy Physics Witmem Technology Co. Ltd. Department of Physics Laurentian University Also at sNOLAB Physics Department Colorado State University Department of Physics and Physical Oceanography University of North Carolina at Wilmington Physics Department and CEEM Indiana University Carleton University Commissariat àl’Energie Atomique et auxénergies alternatives Physics Department Stanford University Department of Physics Drexel University University of California Amherst Center for Fundamental Interactions and Physics Department University of Massachusetts Technische Universit?t München Physikdepartment and Excellence Cluster Universe Qventus Department of Physics University of Virginia Physics Department University of Maryland Department of Physics at the University of California Department of Physics and Astronomy University of Alabama Wright Laboratory Department of Physics Yale University Department of Physics Princeton University IBs Center for Underground Physics Physics Department University of California sNOLAB Department of Physics and Astronomy Stony Brook University SUNY sCIPP University of California Institute for Experimental Physics Hamburg University Department of Physics and Astronomy Iowa State University Kellogg Lab Caltech LHEP Albert Einstein Center University of Ber

A new search for two-neutrino double-beta(2vββ) decay of136Xe to the 01+excited state of136Ba is performed with the full EXO-200 dataset.A deep learning-based convolutional neural network is used to discriminate signal from background *** detection efficiency is increased relative to previous searches by EXO-200 by more than a factor of *** the addition of the Phase Ⅱ dataset taken with an upgraded detector,the median 90%confidence level half-life sensitivity of 2vββ decay to the 01+state of136Ba is 2.9 × 1024yr using a total136Xe exposure of 234.1 kg *** statistically significant evidence for 2vββ decay to the 01+state is observed,leading to a lower limit of T1/22v(0+→01+)>1.4×1024yr at 90% confidence level,improved by 70% relative to the current world’s best constraint.

关键词： EXO-200 experiment neutrinoless double beta decay excited state

strength of siO2 across the stishovite-CaCl2 phase boundary

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Strength of SiO2 across the stishovite-CaCl2 phase boundary

18th International Conference on High Pressure science and Technology

作者： sean R.shieh Thomas s.Duffy Baosheng Li Department of Geosciences Princeton UniversityPrincetonNJ 08544 Mineral Physics Institute SUNY at Stony Brook Stony Brook NY 11794

siO polymorphs are among the most abundantmaterials in the Earth’s crust and are possibleconstituents of the lower ***,which hasoctahedrally coordinated silicon,can be regarded as aprototype for the high-pressure silicates of the Earth’slower *** the elasticity andrheology of stishovite is important for modeling thedynamics of the Earth’s *** are no directstrength measurements on stishovite at lower mantleconditions,but its high Vickers hardness (33 GPa) andhigh shear modulus (220 GPa) at ambient pressures haveled to its classification as a superhard *** report the results of radial diffraction measurementsunder high-pressure *** sample was synthesized in the 2000-ton uniaxialsplit-sphere apparatus (UssA) at the stony brookHigh-Pressure *** sample was groundedinto powder ( μm) and packed into a 50- m hole in aBe *** sample was compressed in a diamondanvil cell under intentionally non-hydrostatic conditions.A 10-μm foil of Au was placed on top of the sample as a

关键词： High Pressure silica X-ray Diffraction stress.

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热流与大陆地壳的化学组分

地质科学译丛 1997年第2期14卷 28-32页

作者： s.M.McLennan 闰升好 Department of Earth and space sciences State University of New York at Stony BrookStony BrookNY11794-2100USA

新近的大陆地壳化学组分模型建立在各种地球物理、地质和岩石学条件上,并显示较宽的组分变化范围。其中 siO_2变化在(57～64)w_B%,K_2O 为(1.1～2.4)w_B%。大多数不相容元素有较高含量估值的模型暗示着这些元素在贫化地幔中极端亏损(>7... 详细信息

新近的大陆地壳化学组分模型建立在各种地球物理、地质和岩石学条件上,并显示较宽的组分变化范围。其中 siO_2变化在(57～64)w_B%,K_2O 为(1.1～2.4)w_B%。大多数不相容元素有较高含量估值的模型暗示着这些元素在贫化地幔中极端亏损(>70%)。地壳热流制约着大陆地壳内产热元素(HPE:K,Th,U)的丰度,因而,为检验各种模型提供了一条明确而重要的途径。大陆热流中地壳放射性成因组分应在18～48mW/m^2范围内,并几乎肯定介于21～34 mW/m^2之间。后者限定了地壳中的 HPE 丰度(假设地壳厚度为41km,K/U=10000,Th/U=3.8),K_2O=0.96%～1.57%,Th=(3.0～4.94)×10^(-6),U=(0.80～1.30)×10^(-6)。主要根据地震或者地质填图资料建立的地壳区域模型以及那些认为大陆地壳较酸性且富集不相容元素的模型都超越了这些约束条件的上限。

关键词：热流大陆地壳化学组分

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An update on the influence of natural climate variability and anthropogenic climate change on tropical cyclones

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Tropical Cyclone Research and Review 2023年第3期12卷 216-239页

作者： suzana J.Camargo Hiroyuki Murakami Nadia Bloemendaal savin s.Chand Medha s.Deshpande Christian Dominguez-sarmiento Juan Jesús Gonz´alez-Alem´an Thomas R.Knutson I.-I.Lin Il-Ju Moon Christina M.Patricola Kevin A.Reed Malcolm J.Roberts Enrico scoccimarro Chi Yung(Francis)Tam Elizabeth J.Wallace Liguang Wu Yohei Yamada Wei Zhang Haikun Zhao Lamont-Doherty Earth Observatory Columbia UniversityPalisadesNYUSA National Oceanographic and Atmospheric Administration/Geophysical Fluid Dynamics Laboratory PrincetonNJUSA University Corporation for Atmospheric Research BoulderCOUSA Vrije University Amsterdam AmsterdamNetherlands Federation University Australia BallaratVictoriaAustralia Indian Institute of Tropical Meteorology Ministry of Earth SciencesPuneIndia Instituto de Ciencias de la Atmosfera y Cambio Clim´atico Universidad Nacional Autonoma de Mexico(UNAM)Mexico CityMexico spanish state Meteorological Agency(AEMet) MadridSpain National Taiwan University TaiwanChina Jeju National University JejuRepublic of Korea Iowa state University AmesIAUSA stony brook University Stony BrookNYUSA Met Office ExeterUnited Kingdom Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici BolognaItaly The Chinese University of Hong Kong Hong KongChina Old Dominion University NorfolkVAUSA Fudan University ShanghaiChina Japan Agency for Marine-Earth science and Technology YokohamaJapan Utah state University LoganUTUSA Nanjing University of Information science and Technology NanjingChina

A substantial number of studies have been published since the Ninth International Workshop on Tropical Cyclones(IWTC-9)in 2018,improving our understanding of the effect of climate change on tropical cyclones(TCs)and associated hazards and *** studies have reinforced the robustness of increases in TC intensity and associated TC hazards and risks due to anthropogenic climate *** modeling and observational studies suggested the potential influence of anthropogenic climate forcings,including greenhouse gases and aerosols,on global and regional TC activity at the decadal and century time ***,there are still substantial uncertainties owing to model uncertainty in simulating historical TC decadal variability in the Atlantic,and the limitations of observed TC *** projected future change in the global number of TCs has become more uncertain since IWTC-9 due to projected increases in TC frequency by a few climate models.A new paradigm,TC seeds,has been proposed,and there is currently a debate on whether seeds can help explain the physical mechanism behind the projected changes in global TC *** studies also highlighted the importance of large-scale environmental fields on TC activity,such as snow cover and air-sea *** projections on TC translation speed and medicanes are new additional focus topics in our *** and future research are proposed relevant to the remaining scientific questions and assisting policymakers.

关键词： tropical climate variability

通过共轭多炔的固相拓扑聚合合成新型石墨材料

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通过共轭多炔的固相拓扑聚合合成新型石墨材料

小剂量阿司匹林在稳定型心血管疾病患者中的使用:一项荟萃分析

2015年全国高分子学术论文报告会

作者：罗亮 Nancy s.Goroff 南开大学化学学院高分子化学研究所 Department of Chemistry Stony Brook University

石墨材料由于其突出的各种物理化学性能吸引了人们广泛的兴趣。而如何通过化学合成特别是高分子聚合的方法制备具有可控化学结构的石墨材料,对有机高分子化学家是一项长期的挑战。我们采用新型的主客体模板技术成功聚合了具有共轭多炔... 详细信息

石墨材料由于其突出的各种物理化学性能吸引了人们广泛的兴趣。而如何通过化学合成特别是高分子聚合的方法制备具有可控化学结构的石墨材料,对有机高分子化学家是一项长期的挑战。我们采用新型的主客体模板技术成功聚合了具有共轭多炔结构的单体diiodohexatriyne和diiodooctatetrayne。在此种方法下,主体（host）分子由oxalamide或urea基团构成,可通过氢键自组装为一个3D模板,端基为Lewis碱性的nitrile和pyridine基团。通过Lewis酸碱作用,单体可以作为客体（guest）分子嵌入此3D模板,形成主客体规则排列的共晶结构。单体的排列参数则可通过主体的化学结构进行调节。当单体排列符合聚合条件时,即可在外界引发下发生聚合,所生成的全碳高分子主链可自交联生成石墨结构,并经由X光衍射、固体核磁共振、拉曼、电镜等多种方法全面表征。

关键词：固相聚合模板聚合聚多炔石墨结构单晶聚合

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中国医学前沿杂志（电子版） 2008年第2期1卷 60-66页

作者： Jeffrey s Berger David L Brown Richard C Becker 沈兰洁 From Duke Clinical Research Institute DurhamNC From stony brook University school of Medicine Stony BrookNY

在心血管疾病和血栓形成的病理生理学中,血小板的重要性不言而喻[1-5].具有抗血小板活性的药物可降低心血管疾病的患病率和死亡率,这在不同类型的患者中都已得到了证实[6-11].

关键词：小剂量阿司匹林心血管疾病心血管不良事件稳定型心绞痛荟萃分析血管疾病患者型心

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纳米复合反渗透膜结构的构建及其海水淡化效率

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纳米复合反渗透膜结构的构建及其海水淡化效率