一类带有时滞的相互依存的系统解的渐近行为

章讨论了一类带有时滞的相互依存的系统解的渐近行为．应用上下解和单调迭代方法获得系统全局解的共存性和解的渐近行为．     

欧洲足球五大联赛进球的时间序列模型构建及预测

通过文献资料、数理统计、对比分析等研究方法对欧洲足球五大联赛2000-2001赛季至2016-2017赛季的场均进球进行时间序列分析,构建了ARIMA模型及结果预测。研究表明：（1）欧洲五大联赛的进球特征表现出单一赛事不同时期的波动性和不同赛事之间的横向差异性。（2）欧洲五大联赛的模型分别是德甲为ARIMA（0,1,3）,法甲为ARIMA（0,1,0）,西甲为ARIMA（1,1,3）,意甲为ARIMA（0,1,2）,英超为ARIMA（1,1,2）。（3）通过模型的构建可用于短期预测,进球序列整体呈波动状态,拟合值和观测值曲线在整个区间整体拟合情况良好。     

Student Effort in Preparing for Exams: Intertemporal Preferences and Loss Aversion

In the last two decades, much empirical research has been done in the field of behavioral economics to explain the psychological foundations for economic decisions. In particular, it has been shown that people exhibit time‐inconsistent behavior when making intertemporal decisions, i.e., they demand higher interest rates for a delay of their consumption in the near rather than in the distant future. People also show loss aversion. They demand more compensation for a loss than they are willing to sacrifice for a gain. We analyze these features for the nonmonetary decision of the amount of time invested in learning hours before an exam. Asked at two different points in time, the students were willing to learn more when the time of learning seemed far away than when the learning time had arrived. On the other hand, students were loss averse trying to prevent a deterioration of their grade to a larger extent than when they tried to work for an amelioration.     

视觉疲劳消除器电路的设计和分析

针对目前中小学生近视眼越来越多的情况,设计出一种由555定时器和十进制计数器/十进制译码显示CD4017B构成的视觉疲劳消除器.并分析了它的电路结构和工作原理,以及电路的安装和调试.     

关于动态市场供需模型的研究

运用经济学观点，建立了动态市场供需模型，通过对其平衡点稳定性的讨论，得到了市场经济稳定的条件。     

Evidence for diurnal periodicity of earthquakes from midnight to daybreak

Previously, inadequate earthquake catalogs and the lack of method made it challenging, if not impossible, to determine the dominant period of earthquake occurrence. With the advent of densely distributed seismic stations in Japan since 2002, 410 642 M1.0+ earthquakes have been cataloged under the mainland within 30-km depth, which provide a superb dataset to identify the periodicity of earthquakes. We processed this catalog using time-frequency analyses and daily stacking, which are powerful in extracting weak periodical signal from strong random noises. We concentrated on the time sector from 0:00 to 6:00 (i.e. from midnight to daybreak), which is a reliable time window for much higher detectability of weak earthquakes, since it has the lowest affects from cultural noises. We successfully observed two apparent periodicities of 12- and 24-hour, which are much smaller than the fortnightly periodicity presented previously in the literature. Synthetic earth tides, after intentionally ignoring the contribution from the Moon, present similar dominant periods as the earthquakes. This may indicate that the dominant period of earthquakes is statistically associated with the Sun rather than the Moon. The daily stacking number of earthquakes using a 15-minute or 1-hour interval shows a peak around 1:30, rather than usually expected 3:00 to 4:00. In addition, bigger earthquakes show more evident variations in the stacking results, and the trend is very consistent for various lower limits of earthquake magnitude from M1.0 to M4.0. These discoveries settled the disputes on the existence of the periodicity of earthquakes since 1886 and may open a window to unravel the mystery of earthquakes.     

大数据环境下并行化先进先出成本算法研究

传统计算机算法在大数据环境下效率较差。为此,从数据处理并行角度出发探索大数据环境下实现先进先出的新算法逻辑,通过先进先出算法实现对成本的有效计算,尤其是提高计算容错性,利用优化的并行化计算模式提高算法时间效率。对传统成本算法与新的并行化先进先出成本算法在实际数据上进行比较实验,结果表明并行化的先进先出成本算法在时间效率上优于传统成本算法,且随着数据量的不断扩大时间效率更加明显,而先进先出的计算模型与传统算法在计算误差上并无扩大,说明并行化的先进先出成本算法在大数据环境下优于传统成本算法。     

时间副词“正、在、正在”的形式语义分析

“正、在、正在”是一组语义极其相近的时间副词。它们的核心语义都表示事件的进行或状态的存续,但着重点不同“。正”着重于事件发生的时间位置“,在”强调事件所处的进行、存续之状态,而“正在”则既表示事件发生的时位,又强调事件进行时所呈现的状态。在此基础上,结合事件语义学、范畴语法以及谓词逻辑等理论,对其语义进行形式化描述,更加验证了语义特征分析的准确性以及时态分析的可靠性,也向实现中文信息处理又迈进一步。     

试析《无名的裘德》中小时光老人形象之作用

哈代的小说《无名的裘德》中次要人物小时光老人这一形象常为读者与批评家所忽视,这与他在小说中的重要作用是不相称的。小时光老人对于整部小说有着重大意义：首先他是悲剧的承受者与推动者;其次他是时代的先驱者与预言者;最后,他对塑造其他人物形象也有重要作用。小时光老人这一形象的独特作用,是值得我们去深入研究的。