PSII高效传能超快微观机理研究

在飞秒、皮秒时间分辨泵浦探测光谱学、荧光动力学、能量传递动力学研究基础上，确立了PSⅡ各功能单元激发能传递途径，由主外周天线LHCIIb吸收太阳能，通过次外周天线CP29，CP26，CP24，经内周天线CP43和CP47分别传递到反应中心D1－D2－Cytb559。利用四能带理论解析研究了PSII激发能传递机理和规律，利用四能级理论解析研究了天线复合物内部激发能传递过程。最后理论计算了PSII核心天线CP43及CP47中β－Car到Chla分子间激发能传递效率，分别为47．5％和66．5％。     

Evolution of Electron Velocity Distribution during ECRH and Heating Effect Analysis

1 Electron velocity distributions and energy deposition of ECW Two set of soft X-ray spectra detection system consist of high performance sillicon drift detectors （SDD） , high speed A/D transform and processing software, software pulse height analyzer （SPHA）. They are installed at mid plane （ r=0 ） and undermid plane （ r=-16.4 cm ） of HL-2A tokamak respectively to measure the time evolution of soft X-ray spectra. According to spectrum, the thermal electron and superthermal electron temperatures are derived. Because of the ratio of peak counts to background counts is very high （p/b 〉1 400-3000 ） ,     

反应扩散方程组解的渐近性质

本文讨论带齐次Ｎｅｕｍａｎｎ边界条件的一类反应扩散方程组解的渐近性质．证明了对于任意的μ∈［０，２）解在Ｃμ（Ω）中收敛于常数平衡解，同时给出了收敛速率．     

影响遥测实时系统同步性的信号相关属性测试研究

无码元翻转持续时间”、“码速率准确度和稳定度”等信号属性参数对PCM遥测系统同步性有着重要的影响,国家军用标准对此有一定描述;针对长期应用系统出现的某些与国军标相异现象,采取对系统内在实现机理剖析和验证测试相结合方法,探明了问题所涉及的系统内核以及系统能够适应的信号参数值域;解析了长期应用中遇到的诸多问题产生的根本原因;为当前和今后工程应用进行问题分析和研究提供了重要参考。     

Crystallization behavior of disproportionately high and low molecular weight PEO blends

The crystallization behavior of PEOs with molecular weight of 1 Ok and 200k as well as their blends was studied in details. The results show that the lower molecular weight PEO crystallizes with faster crystallization rate as judged from a shorter time for completing the crystallization. On the other hand, the higher molecular weight PEO crystallizes at relatively higher temperature, indicating an early start of crystallization compared with the lower molecular weight one. The blends of these two PEOs with different blend ratios always cocrystallize during the cooling processes. It is confirmed that mixing of the 10k PEO with the 200k one is in favor of the crystallization of the system. This is not only demonstrated by the early start of the crystallization at higher crystallization temperature, and also a faster crystal growth of the blend with respect to the 200k PEO. The crystallization of the blends at higher temperature is caused by an early start of nucleation and an increment of nucleus density. This may originate from the density fluctuation of the blend and a reduction in energy barrier for nucleation. Moreover, it is found that the crystallinity of the 1 Ok PEO rich blends increases with increasing concentration of the 10k PEO. This is caused by the solvent effect of the 10k PEO toward the 200k PEO. On the other hand, the crystallinity of the 30/70 （10k/200k） PEO blend is decreased a little bit. This may be a balanced result of the improved crystallization of the 200k PEO at the expense of the high crystallization ability of the 1 Ok PEO.     

“四重表征”化学教学模式与“手持技术”整合的案例研究——以“浓度对硫代硫酸钠与硫酸反应速率的影响”为例

以"浓度对硫代硫酸钠与硫酸反应速率的影响"为内容,将"四重表征"化学教学模式与手持技术结合,发挥手持技术数字化实验仪器的优势,从"数据采集"到"数据分析",逐步引导学生收集必要数据探究浓度对该反应速率的影响,并从"四重表征"模式的4个维度深入探究浓度对反应速率的影响,提高学生运用"四重表征"分析问题的能力。     

应用机器学习方法构建药物分子解离速率常数的预测模型

越来越多的研究表明:药物分子与靶标分子的结合动力学性质与其在体内的药效有很强的相关性。因此,以改善结合动力学性质为导向的分子设计为药物研发提供了新的思路。本工作的研究目标在于得出预测药物分子解离速率常数(koff)的通用型定量结构-动力学关系(QSKR)模型。我们从文献中收集了406个配体分子的解离速率常数实验值,采用分子模拟方法构建了所有配体与靶蛋白复合物的三维结构模型。然后基于蛋白-配体原子对描述符,采用随机森林算法来构建预测配体分子解离速率常数的QSKR模型。通过探索不同条件(如距离区间,划分区间宽度和特征选择标准)下产生的描述符集合对模型预测精度的影响,确定当采用距离阈值为15?、划分区间宽度为3?、特征选择方差水平为2时得到的QSKR模型为最优,在两个独立测试集上获得良好的预测精度(相关系数为0.62)。本工作对预测药物分子解离速率常数这一关键科学问题进行了有益的探索,可为后续研究提供思路。     

介质环境对TGFB晶体生长的影响

本文精确测定了pH值在1.4～3.0,温度在300.15～319.15K范围内氟铍酸三甘肽(简称TGFB)的溶解度,拟合出溶解度与pH值的经验方程.用静态体视显微法测定了溶液的pH值,溶液中杂质离子(FeF-36,SiF2-6)浓度及表面活性剂(十二烷基磺酸钠,十六烷基三甲基溴化铵)浓度与TGFB(110)晶面生长速率的关系曲线,并进一步讨论了它们的影响机理.     

Influence of temperature on metal-organic frameworks

Reaction temperature is one of the key parameters in the synthesis of metal-organic frameworks （MOFs）. Though there is no convergence with regard to the various experimental parameters, reaction temperature has been found to have remarkable influence on the formation and structure of MOFs, especially toward the control of topology and dimensionality of the MOF structures. Theoretically, the reaction temperature affects directly the reaction energy barrier in reaction thermodynamics and the reaction rate in the reaction kinetics. This review aims to show the influence of reaction temperature on crystal growth/assembly, structural modulation and transformation of MOFs, and to provide primary information and insights into the design and assernblv of desired MOFs.