Structure and Formation of Novel Chlorinated Fullerenes

富勒烯独特的球形结构和物理化学性质，使它在光电、催化、医学等领域都有广泛的应用，目前仅有C60、C70以及它们的部分衍生物实现了商业化生产和应用，而拥有庞大异构体种类和数量的非IPR富勒烯，因为十分活泼而难以捕获，故非IPR富勒烯的稳定化合成成为富勒烯研究的重要方向之一。非IPR富勒烯可以通过内嵌衍生化法和外接衍生化法的方式得到稳定并合成表征出来。本论文通过对氯原子参与的电弧放电法合成得到的碳灰进行分离和表征，得到了一系列新的非IPR富勒烯及富勒烯衍生物，并通过质谱和单晶X射线衍射对其结构和性质进行了一系列的研究，主要包括以下几方面的工作： 一：通过对氯原子参与的电弧放电法合成得到的碳灰进行...Because of the unique structure and physical and chemical properties, fullerenes have potential application in photoelectric, catalysis and medicine. Different from the classical fullerenes, such as C60 and C70 which can be commercially produced, the non-IPR fullerenes with a large number of isomers are difficult to synthesis because of the high reactivity and instability caused by the fused penta...学位：理学博士院系专业：化学化工学院_无机化学学号：2052013015380

Retrieving the Most Prevalent Small Fullerene C(56)

通讯作者地址: Xie, SY (通讯作者),Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] of China,20721001 ,21031004 973 Program 2007CB815301 2011CB93590

近红外预测红三叶异黄酮含量的模型研究

应用偏最小二乘法建立红三叶(Trifolium pratense)多种异黄酮及总异黄酮定量分析的近红外模型。用验证集对模型的预测性能进行了评价。结果表明:黄豆黄苷、芒柄花黄素及总异黄酮的模型预测效果较理想。其中,黄豆黄苷模型系统偏差为-0.007,相关系数为0.83,芒柄花黄素模型系统偏差为0.010,相关系数为0.91,总异黄酮模型系统偏差为-0.185,相关系数为0.90

Influence of two kinds of high temperature degradation methods on the optical and thermal characteristics of power white LEDs

测试和比较了大功率白光lEd在高温耐电(HTCd)和高温存储(HTS)两种老化条件的光热性能变化。结果表明,在HTCd老化下,光通量衰减达到40~60%;而HTS下的衰减只有10~14%。这说明,电流应力对lEd的寿命影响比较大。利用热阻瞬态响应法测试和结构函数理论分析两种高温老化条件下lEd的热特性,结果表明,在HTCd老化下lEd热阻的变化较HTS更为明显,并且热阻变化大多体现在导热Ag胶层。这主要是由于高温条件下电流应力引起Ag颗粒的空间分布不均,使粘结界面产生空隙导致热阻发生不同程度的改变。In this paper,high temperature current driving(HTCD) stress and high temperature storing(HTS) stress are applied to study the degradation and thermal characteristics of high power LEDs.The results show a larger light dimming of 40%-60%under temperature-current-combined stress,and only 10%-14% dimming under temperature-only stress,demonstrating more obvious influence of the current stress on LED′s lifetime.The junction-to-case thermal resistance has changed a little under both degradation methods,with a larger change under the temperature-current-combined stress.The change mainly happens in the die attachment layer of the power LED,i.e.,the silver layer.The reason is that the inhomogeneous spatial distribution of silver particles results in gaps in the bonding interface under the high temperature.国家“863”计划(2006AA03A175);福建省科技计划(2008J0030);厦门大学基础创新科研基金(中央高校基本科研业务费专项资金)(2011121046)资助项

Amplitude analysis of the decays D0 → π+π−π+π− and D0 → π+π−π0π0*

Using e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, a joint amplitude analysis is performed on the decays D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η). The fit fractions of individual components are obtained, and large interferences among the dominant components of the decays D0 → a1(1260)π, D0 → π(1300)π, D0 → ρ(770)ρ(770), and D0 → 2(ππ)S are observed in both channels. With the obtained amplitude model, the CP-even fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are determined to be (75.2 ± 1.1stat. ± 1.5syst.) % and (68.9 ± 1.5stat. ± 2.4syst.)%, respectively. The branching fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are measured to be (0.688 ± 0.010stat. ± 0.010syst.)% and (0.951 ± 0.025stat. ± 0.021syst.)%, respectively. The amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0 → 4π when used to determine the CKM angle γ(φ3) via the B− → DK− decay

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies