摘要：It is a great challenge to finely tune the morphology of iron oxides for energy storage. In this work, we introduced a facile hydrothermal method to obtain single crystalline hematite （α-Fe2O3） nano-coffee beans （NCBs） with the assistance of acetic acid. Interestingly, α-Fe2O3 nanos- tructures with this special morphology were formed under the effect of Ostwald ripening and oriented etching of H^＋ ions along [001] direction, which could be proved by the scanning electron microscope/transmission electron microscope and X-ray diffraction. After calcination at high temperature, the as-prepared α-Fe2O3 NCBs were used as potential anode ma- terials, showing a very high reversible capacity of 810 mA h g^-1 （0.2 C）, excellent cycling stability, and high-rate performance for lithium storage. Hence, in virtue of the good performances, the structural design of nanomaterials would be promoted in the fabrication of electrode materials for lithiumion batteries.

摘要：natural chromophores wildly exist in living bodies and have been utilized for thousands of years[1].Many of them,such as quinine[2],luciferin[3-5],coelenteramide[6,7],and coumarin[8],can fluoresce and have been widely applied in biosensor,immune sensor,and fluorescent imaging agents[9,10].

摘要：背景:群体反应性抗体可介导超急性排斥反应,导致群体反应性抗体阳性致敏患者肾移植成功率和移植物存活率均低于非致敏患者。目的:根据人类白细胞抗原交叉反应组配型标准为群体反应性抗体阳性致敏肾移植患者选配合适供者,观察移植后急性排斥反应发生率及移植肾存活情况。设计:病例观察。单位:南方医科大学珠江医院。对象:选择1997-01/2003-12在南方医科大学珠江医院器官移植科施行肾移植136例群体反应性抗体阳性的致敏受者,男41例,女95例,年龄(45±9)岁。初次肾移植115例,2次移植18例,3次移植2例,4次移植1例。所有受试对象均对检测项目知情同意,实验经过医院伦理委员会批准。LAT莱姆德抗原板和LAT-Mix混合抗原板购自美国OneLambda公司。SMT72R抗人类白细胞抗原-Ⅰ类单克隆抗体湿板和人类白细胞抗原-Ⅱ类DNA分型试剂购自美国OneLambda公司。方法:以酶联免疫吸附试验动态监测患者手术前后IgG型抗人类白细胞抗原抗体水平及其特异性。应用抗人类白细胞抗原-Ⅰ类单克隆抗体湿板进行供、受者人类白细胞抗原-Ⅰ类抗原分型,微量序列特异性引物法进行供、受者人类白细胞抗原-Ⅱ类基因分型,根据美国器官共享网制定的人类白细胞抗原交叉反应组配型标准和Ⅱ类抗原可接受性错配原则进行供、受者选配。评估抗原交叉反应组配型原则下患者移植术后急性排斥反应发生率及移植肾1,3,5年存活率进行评价。主要观察指标:①致敏患者手术前后抗人类白细胞抗原抗体水平及特异性。②供受者人类白细胞抗原组织配型。③肾移植术后急性排斥反应发生率及移植肾存活率。结果:纳入136例PRA阳性致敏患者均进入结果分析,无脱落者。①致敏患者中104例存在抗人类白细胞抗原-Ⅰ类IgG抗体,76例存在抗人类白细胞抗原-Ⅱ类IgG抗体,44例同时存在抗人类白细胞抗原-Ⅰ类和Ⅱ类IgG抗体。②按照传统人类白细胞抗原配型标准供、受者人类白细胞抗原0,1,2,3,4个抗原错配者分别为7,26,47,39和17例;按照人类白细胞抗原交叉反应组配型标准供、受者人类白细胞抗原抗原0,1,2,3,4个抗原错配者分别为31,53,36,16和0例。③按人类白细胞抗原交叉反应组配型原则,人类白细胞抗原无错配者的急性排斥反应发生率明显低于2个和3个抗原错配者,差异有统计学意义(P<0.05),人类白细胞抗原无错配者移植肾1,3,5年存活率高于2个和3个抗原错配者,差异有统计学意义(P<0.05)。结论:①人类白细胞抗原交叉反应组配型标准能提高肾移植供受者的相配率。②良好的人类白细胞抗原配型可降低肾移植术后急性排斥反应的发生率,提高移植肾的存活率。

摘要：Quantum secure direct communication(QSDC)attracts much attention for it can transmit secret messages directly without sharing a *** this article,we propose a one-step QSDC protocol,which only requires to distribute polarization-spatial-mode hyperentanglement for one *** this QSDC protocol,the eavesdropper cannot obtain any message,so that this protocol is unconditionally secure in *** protocol is a two-way quantum communication and has high capacity for it can transmit two bits of secret messages with one pair of *** entanglement fidelities of both polarization and spatial-mode degrees of freedom being 0.98,the maximal communication distance of this onestep QSDC can reach about 216 *** can also be used to generate the *** this regard,the key generation rate is estimated about 2.5 times of that in the entanglement-based QKD with the communication distance of 150 *** the help of future quantum repeaters,this QSDC protocol can provide unconditionally secure communication over arbitrarily long distance.

摘要：光伏热致变色智能窗采用钙钛矿材料并结合其热致变色和光伏特性,既可调控不同温度下的太阳光透过率,又可将吸收的光能转化为可用的电能.在此,我们利用经过优化的后退火工艺设计了一个结构为氟掺杂氧化锡(FTO)/SnO_(2)/CsPbIBr_(2)/NiO_(x)/铟锡氧化物(ITO)的半透明太阳能电池,在最佳条件下其平均可见光透过率为33.2%,光电转化效率为3.89%.同时,基于CsPbIBr_(2)的热致变色特性,我们发现当其由高温着色相转变为低温透明相时,器件的平均可见透过率可从33.2%提高至73.5%.此外,高温相向低温相的转变受湿度主导.当相对湿度从50%上升至90%时,钙钛矿相变时间从1005分钟大幅度下降至17分钟.然而,过高的湿度导致的过快相变会破坏钙钛矿的薄膜形貌和晶体结构,这将对CsPbIBr_(2)钙钛矿造成不可逆损伤.这项工作为半透明光伏和热致变色智能窗的应用提供了重要参考,并可预见这一领域将进一步助力降低建筑和汽车能耗.

摘要：Rational composition design of trimetallic phosphide catalysts is of significant importance for enhanced surface reaction and efficient catalytic ***,hierarchical Co_(x)Ni_(y)Fe_(z)P with precise control of stoichiometric metallic elements(x:y:z=(1-10):(1-10):1)has been synthesized,and Co_(1.3)Ni_(0.5)Fe_(0.2)P,as the most optimal composition,exhibits remarkable catalytic activity(η=320 mV at 10 mA cm^(−2))and long-term stability(ignorable decrease after 10 h continuous test at the current density of 10 mA cm^(−2))toward oxygen evolution reaction(OER).It is found that the surface P in Co_(1.3)Ni_(0.5)Fe_(0.2)P was replaced by O under the OER *** density function theory calculations before and after long-term stability tests suggest the clear increasing of the density of states near the Fermi level of Co_(1.3)Ni_(0.5)Fe_(0.2)P/Co_(1.3)Ni_(0.5)Fe_(0.2)O,which could enhance the OH−adsorption of our electrocatalysts and the corresponding OER performance.

摘要：A harmonic vortex beam is a typical vector beam with a helical wavefront at harmonic frequencies(e.g.,second and third harmonics). It provides an additional degree of freedom beyond spin-and orbitalangular momentum, which may greatly increase the capacity for communicating and encoding information. However, conventional harmonic vortex beam generators suffer from complex designs and a low nonlinear conversion efficiency. Here, we propose and experimentally demonstrate the generation of a large second-harmonic(SH) vortex beam with quasi-nonlinear spin–orbit interaction(SOI). Highquality SH vortex beams with large topological charges up to 28 are realized experimentally. This indicated that the quasi-angular-momentum of a plasmonic spiral phase plate at the excitation wavelength(topological charge, q) could be imprinted on the harmonic signals from the attached WS2 monolayer. The generated harmonic vortex beam has a topological charge of l_(n)= 2 nq(n is the harmonic order). The results may open new avenues for generating harmonic optical vortices for optical communications and enables novel multi-functional hybrid metasurface devices to manipulate harmonic beams.

摘要：背景：骨髓间质干细胞作为种子细胞具有巨大的分化潜力和优势，但对于再生障碍性贫血或骨髓源性肿瘤等疾病的应用受限。现已发现肌源性干细胞具备与其相似的优越性，已引起相关领域研究者的注意。目的：观察兔肌源性干细胞的生物学特性，并对其进行表型分析。设计、时间和地点：细胞体外观察，于2005-08／2006-03在中山大学附属第二医院医研中心完成。材料：清洁级1．5月龄新西兰大白兔1只，增殖培养基为DMEM—LG＋体积分数0．1胎牛血清＋100gm/L血清，融合培养基为DMEM-LC＋2％胎牛血清。方法：兔麻醉后取大腿肌肉，采用差速贴壁Preplate技术分离培养肌源性干细胞，以Ⅺ胶原酶、dispase蛋白酶及胰蛋白酶分步消化，沉淀用增殖培养基重悬，接种在胶原包被的培养瓶中，该培养瓶为PP1。PP1于37℃、含体积分数为0．05的CO2培养箱中静置过夜，随后将悬液转移到另一个胶原包被的培养瓶，此为PP2。随后同法建立PP3，PP4，PP5，PP6。将PP6接种到6孔板进行融合实验，分为两组：一组使用增殖培养基培养，在汇合度超过50％后继续培养，不传代；另一组使用融合培养基进行培养，汇合度达30％时传代培养。主要观察指标：收集PP1～PP6，采用流式细胞仪、免疫细胞化学及Western Blot法鉴定细胞表型。通过不同汇合度及不同浓度血清培养，检测PP6融合情况。结果：PP6细胞〉80％为desmin^＋，〉70％为Bcl-2^＋，〉95％为CD45，提示为高浓度肌源性干细胞，随着纯化步骤的进行，α-SMA表达逐渐减弱，至高度纯化的PP6时己无α-SMA表达。PP6在高汇合度（〉50％）或低血清（仅含2％血清）培养时，极易融合成肌管或肌细胞链，骨骼肌肌球蛋白呈阳性表达。结论：肌源性干细胞具有高水平表达desmin，Bcl-2，极低水平表达CD45，不表达α-SMA的生物学特性，在高汇合度或低血清培养条件下能够多向分化。

摘要：The design of non-noble metal heterogeneous catalyst with superior performance for selective hydrogenation or transfer hydrogenation of nitroarenes to amines is significant but ***,a single-atom Fe supported by nitrogen-doped carbon(Fe_(1)/N-C)catalyst is *** Fe_(1)/N-C sample shows superior performances for the selective hydrogenation and transfer hydrogenation of nitrobenzene to aniline at different *** functional theory(DFT)calculations show that the superior catalytic activity for the selective hydrogenation at lower temperatures could be attributed to the effective activation of the reactant and intermediates by the Fe_(1)/***,the excellent performance of Fe_(1)/N-C for the selective transfer hydrogenation could be attributed to that the reaction energy barrier for dehydrogenation of isopropanol can be overcome by elevated temperatures.

摘要：为解决传统方法中从数据获取到数据处理出现的误差,进一步改善操作方法,该文设计了一种半球摄影法检测系统,使用鱼眼镜头在不同位置下拍摄单棵果树。对拍摄的图像进行处理,并对叶面积指数测量值和真实值进行验证对比,研究影响测量叶面积指数的因素。研究结果表明:鱼眼镜头在不同方位、不同偏移、不同高度下拍摄,以及不同软件处理方法都会对叶面积指数的测量产生影响。最优化的参数组合为:选择果树东方位拍摄,鱼眼镜头距离柑橘树主干25cm,距离地面高度89cm;在软件处理分析时,应取LAI4R,天顶角设为60°,同时采用软件遮罩功能对与冠层无关的区域进行屏蔽。在上述方法操作下,系统线性回归模型的决定系数R2为0.8268,测量值与真实值的平均绝对误差为0.31,平均相对误差为14.19%。该方法可为单棵果树叶面积指数的检测提供研究基础。