四硝基二苯基硫及其衍生物与混酸反应的研究

本文通过对四硝基二苯基硫及其衍生物与混酸反应的研究,发现在混酸作用下,四硝基二苯基硫及其生物主要发生氧化反应而不是硝化反应。因此,四硝基二苯基硫及其衍生物与混酸反应得不到硝化产物。本文还合成了未见文献报道的5,5＇-二氯-2,2,＇4,4＇-四硅基二苯基亚,5,5＇-二乙酰胺基-2,2＇,4,4＇-四硅基二苯基硫,5,5＇-=乙酰胺基-2,2＇,4,4＇-四硝基二苯基亚砜。     

关于有限集生成的Lineality空间维数的一种简便算法

给出了利用ＡＢＳ算法计算矩阵秩的一种新方法．以及计算有限集生成的Ｌｉｎｅａｌｉｔｙ空间维数的简便算法．     

基于固定检测器的区域交通状态判别方法

以固定检测器获得的交通数据为基础,分别建立路段和交叉口交通状态判别模型;考虑不同路段和交叉口对区域路网整体交通状态影响程度的差异性,建立路段和交叉口交通状态的权重计算模型;在此基础上建立区域交通状态的综合判别模型;并分析状态指标P与路网中车辆平均行程速度的相互关系,确定路网P所表示的交通状态级别;最后利用Vissim软件设计包含9个交叉口的典型路网,根据采集的数据对模型进行验证.仿真结果表明:所建立的方法可以有效地对区域交通状态进行判别.     

Fast Fractal Image Encoding Based on Special Image Features

The fractal image encoding method has received much attention for its many advantages over other methods, such as high decoding quality at high compression ratios. However, because every range block must be compared to all domain blocks in the codebook to find the best-matched one during the coding procedure, baseline fractal coding (BFC) is quite time consuming. To speed up fractal coding, a new fast fractal encoding algorithm is proposed. This algorithm aims at reducing the size of the search window during the domain-range matching process to minimize the computational cost. A new theorem presented in this paper shows that a special feature of the image can be used to do this work. Based on this theorem, the most inappropriate domain blocks, whose features are not similar to that of the given range block, are excluded before matching. Thus, the best-matched block can be captured much more quickly than in the BFC approach. The experimental results show that the runtime of the proposed method is reduced greatly compared to the BFC method. At the same time, the new algorithm also achieves high reconstructed image quality. In addition, the method can be incorporated with other fast algorithms to achieve better performance. Therefore, the proposed algorithm has a much better application potential than BFC.     

基于局部余弦变换的2.4 kb/s低比特率语音编码

系统地设计了一个基于局部余弦变换的2.4kb/s低比特率的语音编码器，对局部余弦变换系数采用分维矢量量化方法进行量化，码书设计采用LGB算法。编码中的码书搜索采用树形状快速搜索算法。通过主观非正式听力测试和客观参数评价，从理解性和自然度两方面来看，用设计的2.4kb/s低比特率的编码方法编码的语音质量比FS1015（LPC－10e)编码标准编码的语音质量要好，而且具有较强的鲁棒性，适合于对各种环境中的语音进行编码。     

下穿通道建设对滑行道变形影响的数值模拟

由于下穿通道的建设,飞机起降过程中滑行道产生的差异沉降可能对起降安全性及舒适性有不利影响.利用有限元软件进行数值模拟,分析飞机滑行过程中,滑行道的下穿通道及过渡段位置的变形规律.研究表明,在飞机荷载短期作用下,下穿通道位置的滑行道位移峰值减小;通过设置过渡段,滑行道与下穿通道之间的变形差异显著减小.过渡段采用三轴搅拌桩进行加固,对比梅花形布桩形式发现,矩形布置能显著提高行驶的平稳性;格栅形布置可以较大程度地降低成本.     

基于异质信息网络元路径的药物‒靶标相互作用预测模型

提出一种融合元路径信息的图神经网络模型, 用于预测药物-靶标相互作用(GMDTI)。首先根据8个数据集中的药物、靶标、疾病和副作用数据以及它们之间的8种作用关系, 构建药物-靶标异质信息网络(HIN); 然后定义两条元路径来捕获药物-靶标HIN 中的不同子结构信息和不同节点间隐藏的语义信息, 并应用图神经网络的方法聚合节点的一阶邻居信息和元路径中节点间的语义信息; 最后利用端到端的学习方法完成DTIs预测。该方法同时考虑药物-靶标HIN的结构特性和元路径语义信息, 有助于学习到更多潜在的药物-靶标作用关系。实验结果表明, GMDTI的预测准确率高于所有基线模型, AUC达到98.6%, AUPR达到94.5%。同时通过调整数据的稀疏度和降噪实验, 证明GMDTI具备优于所有基线模型的鲁棒性。     

The Payouts Choice for Deposit Insurance System

Entropy balancing is introduced to assess the deposit insurance design characteristics in this paper. Applying an extensive duration data including 141 countries from 1960 to 2015, the authors employ the entropy balancing method to simulate the data structure under the implicit deposit insurance system. Then the paper adopts an endogenous treatment effects model and a Heckman two-step selection model to examine payouts choice of the deposit insurance. It is found that entropy balancing can calibrate unit weights and reweight treatment and control groups by a maximum entropy scheme.Thus, a possibly given conditions will be satisfied and information concerning sample moments will be integrated. The results show clearly that different payouts choice and the corresponding coverage setting can effectively reduce the moral hazards that may result from the introduction of a deposit insurance scheme. When the Payouts is Per Depositor Account or Per Depositor, the banks' moral hazard is higher. However, the payment method of Per Depositor Per Institution can effectively restrain the banks' risk-taking activities.     

Morphological evolution and kinetic enhancement of Li2FexMn1-xSiO4/Ccathodes for Li-ion battery

Li_2MnSiO_4-based cathode materials possess reasonable work potentials and high theoretical capacities,while the practical energy/power densities are constrained by their inferior kinetics of Li~+ diffusion.In this work,the Pmn2_1-structure Li_2Fe_xMn_(1-x)SiO_4/C materials were synthesized via a solvothermal method and evaluated as Liion cathode materials,with notable morphological evolutions and tunable crystallographic habits observed after solvothermal process.The Li_2Fe_(0.33)Mn_(0.67)SiO_4/C material delivers an initial reversible capacity of 250.2mAh g~(-1)at 0.1 C(～1.51 Li~+insertion/extraction,1 C=166 mA g~(-1)),excellent high-rate capability(52.2 mAh g~(-1)at 5 C),and good long-term cyclability(64.6%after 196 cycles at 2 C).The enhanced electrochemical properties are attributed to the boosted ion/electron transports induced by preferred morphological and structural characteristics of Li_2Fe_(0.33)Mn_(0.67)SiO_4/C.     

基于翻译质量估计的神经网络译文自动后编辑

针对译文后编辑中的过度修正问题, 提出利用神经网络自动后编辑方法, 训练专门用于提供少量复合编辑修正和单一编辑类型修正的神经网络后编辑模型。在此基础上, 通过建立一个基于翻译质量估计的译文筛选算法, 将提出的模型与常规的神经网络自动后编辑模型进行联合。在WMT16自动后编辑任务测试集上的实验结果表明, 与基准系统相比, 所提方法显著提高了机器译文的翻译质量, 实验分析也表明该方法能有效地处理过度修正造成的译文质量下降问题。