基于替换概率的闪存数据库缓冲区替换算法

闪存具有和传统磁盘不同的特性，包括写前擦除、异地更新、读写延迟非对称等.传统的面向磁盘的缓冲区替换算法无法在闪存数据库系统中获得较好的性能.文中提出了一种新的面向闪存数据库的缓冲区替换算法——APB-LRU，其特点：(1)该算法将缓冲区分为冷区和热区，用来捕获数据访问频度，前者用于存放只访问过一次的数据页，后者用于存放至少访问过两次的数据页；(2)采用了其它研究所没有的概率替换机制，即以较大的概率替换冷区中的干净页，以较小的概率替换冷区中的脏页，从而避免了冷脏页长期驻留缓冲区的情况，提高了命中率，获得了较好的整体性能；(3)设计了冷、热区比例动态变化机制，可以根据工作负载的变化动态调整冷、热区所占缓冲区的比例，从而使得替换算法在不同的负载模式下都可以取得较好的性能.基于不同测试数据集的大量实验结果表明，APB-LRU算法具有比其它已有的算法更好的性能.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)(2011121049,2012121030);国家自然科学基金(61001013,61102136,61202012);福建省自然科学基金(2011J05156,2011J05158,2013J05099)资

Synthesis, Characterization and Asymmetric Catalytic Epoxidation of Novel Chiral Ruthenium(Ⅲ) Complexes

合成了一系列含手性联吡啶的钌 (Ⅲ )络合物 ,并对其进行了IR、UV Vis、CD、电导率等表征。初步考察了其对苯乙烯的不对称催化环氧化性能 ,获得最高达 6 0 %的e.e.值。Some Ru(Ⅲ) complexes with chiral bipyridine have been prepared. The characterization of the complexes was accomplished by IR, UV-vis, CD spectral studies and conductance measurements. The asymmetric epoxidation catalyzed by the complexes was examined with styrene, giving the enantiomeric excess up to 60%.国家自然科学基金 (2 0 1710 37,2 0 0 730 34 );; 福建省自然科学基金 (2 0 0 2F0 16 ,C0 0 2 0 0 0 1)资助项

Synthesis and Characterization of Novel Chiral Mo(0) Complexeswith Chiral Pineno-bipyridine Ligands

为了探讨含手性蒎烯基联吡啶的手性钼(0)络合物的结构对光谱(特别是CD光谱)性质的影响,合成了两个新型手性钼络合物(+)CD452[Mo(CO)4(LRR)]和[Mo(CO)4(LSS)].用元素分析、IR、UV vis、CD、1HNMR和13CNMR等对其进行了充分表征.研究结果表明:两种络合物为一对具有几乎完全相同物理化学性质、配体互为对映体的光学异构体;两者在可见区的CD曲线呈现弱Cotton效应,且大致为镜象对称,说明在相应的手性络合物中,由于联吡啶上相反手性的蒎烯基通过中心金属钼对MLCT发色团产生了手性微扰作用,从而产生诱导CD效应.A pair of novel chiral complexes (+)~(CD)_(452)[Mo(CO)_4(L~(RR))] and (-)~(CD)_(452)[Mo(CO)_4(L~(SS))] were prepared and characterized by EA, UV-vis, IR, NMR and CD spectra in order to investigate the influence of structures on the spectral (especially CD) properties of chiral molybgenum(0) complexes with chiral pineno-bipyridines. The results reveal that the two chiral complexes have almost the same physico-chemical properties and they are a pair of optical isomers with the enantiomeric ligands. Their CD spectra in the visible range show weak Cotton effects, which are approximately of mirror image, indicating that the appended pineno-groups with opposite chirality in bipyridines can perturb the MLCT chromophores in the related complexes through the molybgenum centers respectively and lead to induced CD effects.国家自然科学基金(20171037,20073034);; 福建省自然科学基金(2002F016,C0020001)资

一种基于气相色谱雾计算框架的化工过程故障诊断系统

本发明涉及一种基于气相色谱雾计算框架的化工过程故障诊断系统，包括：终端用户层，任务将在这一层中产生，处理后的结果也将返回到这一层，此外，终端设备还需要发现并指定对应任务转发的雾节点；接入网络层，当终端用户层的用户生成内容后，由接入网络的网络设备将这些信息按照预定的规则发送到对应的雾节点上；雾层，雾计算的核心，提供关键的深度计算、存储和通信功能；核心网络云层，将超出雾层计算或存储能力的任务发送到云数据中心进行数据备份、云计算处理。本发明由于雾计算在本地化引入计算存储设备，通过在本地形成小的数据中心，可以在不失去移动性支持、保证一定程度的处理能力下，很好地解决时延、功耗和资费等问题

Ordinal analysis and the infinite Ramsey theorem

本发明涉及基于离线优化/在线查表方式的双层结构预测控制方法，包括以下步骤：稳态优化层对目标函数进行优化得到控制变量和输出变量的稳态优化值，输出至动态控制层；动态控制层将稳态优化层的稳态优化值作为设定点，通过模型预测控制得到控制输入值，发送至基础控制层用于控制被控对象。本发明降低了双层结构预测控制系统计算复杂度、提高控制实时性、解决稳态优化无解问题、有效消除扰动对稳态优化的干扰

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