融合图卷积和卷积自注意力的股票预测方法

随着我国股票市场的不断发展,一只股票的走势往往受其企业上下游产业发展的影响。针对主流股票预测模型忽略了股票间关联关系的不足,提出了融合图卷积和多头卷积自注意力的股票趋势预测模型。首先使用互相关系数计算多只关联股票的关系矩阵,再使用图卷积神经网络结合关系矩阵对关联股票进行特征提取,其次使用多头卷积自注意力提取时间特征,最后使用分类损失函数多项式展开框架对损失函数进行优化,并进行趋势预测。实验结果表明,所提模型在准确率、查全率、召回率以及F1分数上均优于门控循环单元、时间卷积网络等模型。

建构作者、学术期刊与知识资源平台新型合作关系

在融媒体和人工智能时代,知识资源平台发挥的作用越来越大,同时,作者、学术期刊与知识资源平台之间的版权问题和利益分配问题也日益凸显。应在遵守国家相关法律法规的基础上,加强多方主体的合作,坚持利益均衡原则,改变以往作者、学术期刊和知识资源平台合作过程中的不平等关系,构建作者、学术期刊和知识资源平台的新型合作关系,推动学术期刊高质量发展,为文化强国作出各自应有的贡献。

Research on the Interrelationship among Understanding, Memory and Oral Expression in Listening Teaching of non-English in Higher Vocational College

This is a research report on the interrelationship among understanding, memory and oral expression in listening comprehension training. The research investigated 150 non-English majors through a questionnaire in a higher vocational college. The result indicates that the interrelationship among understanding, memory and oral expression in listening classes which are determined by the listening materials and teaching method directly influences students' listening proficiency and speaking ability. It is suggested that some strategies to be used to foster students' abilities in these three areas so as to improve their listening ability.

多层网络视角下沪深港股票市场关联性演化研究

随着“沪港通”和“深港通”的开通,沪深港股票市场间关联性日趋紧密,而充分认识沪深港股票市场间关联性的演化特征,对维持沪深港股票市场的稳定具有重要的价值.本文从多层网络视角出发,同时考虑股票收益率间的相关性和投资者情绪间的相关性,构建沪深港股票市场多层网络,进而探究沪深港股票市场间的关联关系及演化过程.结果表明,“沪港通”开通后,沪深港股票市场收益率间的关联性以及投资者情绪间的关联性没有显著增强,但不同市场间收益率与投资者情绪的关联性显著增强.而“深港通”开通后,沪深港股票市场收益率间、投资者情绪间以及收益率与投资者情绪间的关联性均显著增强.此外,不同市场之间收益率与投资者情绪间的交互关系并不对称,沪深两市股票收益率与港市股票投资者情绪的关联性较高,而港市股票收益率与沪深两市股票投资者情绪的关联性却较低.

不同产地云当归品质与其土壤养分的相关性研究

综合评价不同产地云当归质量,研究药材有效成分与其产地土壤养分之间的关系,为云当归质量评价研究及优质高产栽培提供理论依据。本研究采用高效液相色谱和紫外可见光谱测定云当归中7个有效成分含量,结合熵权TOPSIS法对不同产区药材进行综合质量评价;同时测定不同深度土层的8个土壤养分,结合双变量分析探讨土壤养分与药材有效成分之间的相互作用关系。研究结果发现,云南迪庆香格里拉的样本综合质量最佳,土壤中全氮(TN)、全磷(TP)、全钾(TK)和硝态氮(NO_(3)-N)的含量以棕色土壤最高,红色土壤最低;大部分产地土壤养分含量基本能满足云南当归药材生长所需的养分需求,而TK含量需根据实际情况适当增补施肥,从而促进云当归中5-羟甲基糠醛和多糖含量的积累。

Evolution trend of the water quality in Dongping Lake after South-North Water Transfer Project in China

To investigate the evolution trend of water quality in Dongping Lake after South-North Water Transfer Project operation as well as to ensure the safe usage of the water receiving areas, water samples were collected and determined before and after water delivery in different hydrological seasons. Then, comprehensive pollution index method, comprehensive nutrition state index method and health risk assessment model were utilized to evaluate the quality, nutrition, and health risk of Dongping Lake water. Results showed that the quality of Dongping Lake water still met level Ⅲ (light pollution) no matter before or after water delivery. The nutrition state was improved from light eutropher before water delivery to mesotropher after water delivery. The health risk level was reduced from high-medium before water delivery to medium level after water delivery. In summary, the operation of the eastern route of South-North Water Transfer Project is beneficial for water environment improvement of Dongping Lake.

Statistical characteristics of heavy metals content in groundwater and their interrelationships in a certain antimony mine area

In recent years, most of domestic and foreign researches about heavy metal pollutions of metal mine mainly focus on water, soil and plants on the surface. There is lack of researches about heavy metal pollution in groundwater of metal mine. In this research, a certain antimony mine area is selected as a typical study area. Also, the study about statistical characteristics of heavy metals in groundwater has been carried out. Furthermore, the interrelationships have been preliminarily discussed through related analysis, such as relevant analysis, cluster analysis and principle component analysis. The results show that: the excessive elements in groundwater of study area are Sb, As, Pb, Se, and Ni. The average mass concentration of Sb, As, and Pb is higher than that of drinking water standards(GB5749-2006). The concentration of most heavy metals in dry season is lower than or equal to that in wet season for groundwater. Zn is the only metal in groundwater showing a different pattern, the concentration of which in dry season is higher than that in wet season. Under the impacts of stratum leaching and absorption effect, the concentration of heavy metals(except Pb and Ba) in groundwater are lower than or equal to that in surface water. As and Se, the two heavy metals have a significant positive correlation, which shows the two elements might have gone through similar environmental geochemical effect. Also, the connection among Zn, Hg, Pb, and Mn is not obvious; therefore, the sources of those elements are quite different. In addition, the elements of Se and As have obvious positive interrelationship with elements of CO_3^(2-) and F^-. Also, the Pb has significant positive correlation with PO_4^(3-), H_2SiO_3 and oxygen consumption. The results of cluster analysis show that 9 different heavy metals in the study area can be divided into 3 categories: Zn, Cd, Mn, Hg, Cu, and Cr belong to the first category, Se and As belong to the second one, and the last category is Pb. Also, the principle component analysis divides 6 heavy metals(Zn, As, Hg, Pb, Mn, and Se) into 4 different principle components, which can be utilized to assess heavy metals pollution situations in groundwater. The reliability of this method is higher than 91%. Moreover, the research provides theory basis and models for establishing evaluation index system and exploring the evaluation method of heavy mental pollution in groundwater.

Eco-environmental benefit assessment of China's South-North Water Transfer Scheme——the middle route project

This paper assess the eco-environmental benefits that may come from the middle route project of China's South-North Water Transfer Scheme(SNWT) with principles and methods of eco-economics and planning reports of SNWT's middle route project. Some benefits were calculated in monetary units. To make sure that the results can be comparable with normal monetary indices, concrete assessment objects and the parameters are prudently selected according to the major characteristics of the project and its water import region. Primary assessment revealed that in different project construction stages, the benefit could be more than 13 07 billion RMB Yuan in 2010 and 19 79 billion RMB Yuan in 2030, respectively. The monetary value tends to increase with social-economic development. To realize these potential benefits, however, calls for more endeavors.

South-north asymmetry of proton density distribution in the Martian magnetosheath

We perform a statistical analysis of data from the Mars Atmosphere and Volatile Evolution (MAVEN) project on the global distribution of protons in the Martian magnetosheath. Our results show that the proton number density distribution has a south-north asymmetry. This south-north asymmetry is most likely caused by the south-north asymmetric distributions of the crustal magnetic fields at Mars. The strong crustal magnetic fields push the inner boundary of magnetosheath to a higher altitude in the southern hemisphere. Due to the outward movement of the inner boundary of the magnetosheath, a compressed magnetosheath forms, causing subsequent increases in proton number density, thermal pressure, and total pressure. Eventually, a balance is reached between the increased total pressure inside the magnetosheath and the increased magnetic pressure inside the induced magnetosphere. Our statistical study suggests that the Martian crustal magnetic fields can strongly affect the proton number density distribution in the Martian magnetosheath.

石油类污染的岩溶地下水环境特征:以淄博市大武水源地为例

岩溶裂隙水资源是北方重要的供水水源,文中选取山东省淄博市大武岩溶裂隙水源地为例,开展石油类污染的岩溶地下水环境特征研究,不仅为岩溶地下水资源的可持续开发利用提供指导,也为岩溶裂隙水环境演化研究奠定基础。文中选取地下水水位、t、pH值、Eh、DO、NO_(3)^(-)、SO_(4)^(2-)、HCO_(3)^(-)、Cl^(-)、三氯甲烷、1,2-二氯丙烷、1,2,3-三氯丙烷、四氯乙烯、三氯乙烯和ΣVOCs作为石油类有机物污染的岩溶地下水环境指标,利用同位素技术、多元统计法和图解法等分析各指标间的相互作用机制来揭示石油类污染地下水的过程及影响程度。区内地下水水动力场和环境条件有利于有机物生物降解作用的发生,有氧和厌氧呼吸同时存在,且无产甲烷过程的发生;ΣVOCs占DOC的比例较小,但仍是影响地下水环境的主要因素之一;地下水体中DIC来源于有机物生物降解的平均百分率为33.93%;综合考虑石油类污染的地下水水化学特征可更有效地解译地下水环境的影响机制。

Relationship between gravity change and Yangbi M_(S)6.4 earthquake

Based on the relative and absolute gravity measurements in the southern South-North Seismic Belt since 2015,we analyzed the dynamic change of the regional gravity field and its relationship with the Yangbi M_(S)6.4 earthquake that occurred on May 21,2021.The results show that:(1)The regional gravity field changes are closely related to the Weixi-Qiaohou fault,which reflects the surface gravity field changes caused by the fault activity from 2015 to 2021;(2)The gravity field change related to the preparation of Yangbi earthquake has experienced the evolution process of"steady state-regional gravity anomaly-local gravity anomaly-four-quadrant distribution-large area positive anomaly-earthquake occurring in the reverse change process";(3)The cumulative and differential change images of the gravity field show that there were significant gravity changes in the two years preceding the Yangbi earthquake,and the earthquake occurred in the high-gradient belt of gravity variation,the center of the four-quadrant,and close to the zero contour turn;(4)The dynamic evolution image of the gravity field can well reflect the precursory phenomena during the preparation for the Yangbi MS6.4 earthquake.Based on the anomaly change of mobile gravity,a certain degree of medium-term prediction was made before the Yangbi M_(S)6.4 earthquake,especially the determination of strong earthquake location.

从五脏生克制化理论探析仲景辨治心悸思路

《伤寒杂病论》对心悸的论述分布散乱,缺乏系统性。从五脏生克制化的角度分析仲景辨治心悸的证治规律,发现仲景辨治心悸首重心阳,其次注重五脏之间的相互关系,用药考虑脏腑病变规律,善治未病之脏,防病传变。从五脏生克制化的角度学习经方,有利于把握疾病传变规律,深入理解仲景处方配伍思路,从而更灵活地运用经方治疗疾病。

超大城市轨道交通与土地利用协同规划研究的上海实践

轨道交通与城市土地空间的协同发展可以归纳为公交引导城市发展模式(TOD)的核心,而轨道交通作为大运量公共交通形式,是公共交通的重要支撑。该文以上海市为例,从轨道交通网络、线路、站点以及车辆基地等方面着手,对轨道交通与城市土地利用规划的相互影响和协同发展进行研究分析,为促进城市可持续发展、强化轨道交通与土地利用规划的协同发展、提高土地利用效率提供借鉴。

南极菲尔德斯半岛陆地、淡水、潮间带、浅海各生态系统的结构及其相互关系的研究

根据我国在南极菲尔德斯半岛地区１０年的各项研究成果和南极其它相关地区的研究结果，综合分析了菲尔德斯半岛地区陆地、淡水、潮间带及浅海４个生态系统的结构和相互关系。研究结果表明，营养物质的流动使得这４个生态系统相互联系形成一个整体。在这种物质流动的过程中，动物的作用尤其关键，如海鸟（企鹅、黑背鸥等）以及海豹的繁殖、取食等活动对营养盐的搬运有利地促进和疏通了营养物质在系统间的流动。此外，物理作用（如雨水的冲刷、潮汐作用和径流的带动等）也有重要影响。

水生环境中细菌与微藻的相互关系及其实际应用

概括了细菌和微藻之间的相互关系及其作用机理,阐述了细菌抑制有害微藻、微藻抑制病原细菌、细菌与微藻协同净化水质的研究进展,并针对水产养殖的实际,提出菌-藻关系研究及开发应用的一些思路。

土壤中锌的形态分布及其影响因素

本文用作者修改的形态提取方法研究了江苏省几种土壤中锌的形态。结果表明,土壤中的锌大部分以硅铝酸盐矿物态和氧化铁结合态形式存在。锌在土壤中的形态分布随土壤pH、有机质含量等因素不同而异。不同形态之间存在平衡关系。

市政污水TOC与COD相关性

总有机碳(TOC)相对于化学需氧量(COD)能够更全面地反映水体中有机物的污染程度,而且TOC测定仪操作简单,数据准确,用TOC监测代替COD监测有利于实现监测仪器化,自动化。通过对市政污水中有机污染物的COD与TOC监测数据的相关性研究,建立了二者之间的线性回归方程和理论值范围方程,为污水中有机污染物的TOC监测代替COD监测提供了实践依据。

江苏省稻瘟病菌生理小种的演变及与水稻品种的相互关系

用7 个全国统一鉴别品种对1980～1996 年采集的江苏省稻瘟病标样的1 032个单孢菌株进行小种鉴定, 分析了江苏省稻瘟病菌小种演变的原因及与水稻品种的关系。结果表明, 江苏省曾先后出现过8 群22 个小种, 除1990年ZA小种群、1991 年ZD、ZE小种群上升为优势种群外, ZG1 小种一直是江苏省的优势小种, 出现频率达66.20% , 为江苏省稳定小种。江苏省各稻区小种组成有一定差异。水稻栽培品种是决定小种种群结构的主要因素之一, 江苏省大部分品种与ZG1小种有亲和性, 只有少数品种能被ZA、ZB、ZC、ZD和ZE群小种侵染, 可能是ZG1 小种在江苏省稻区成为优势小种的主要原因之一。从江苏省大部分主栽品种上能分离到2 个以上小种且不同品种上其小种的组成有一定差异,构成了田间小种结构的复杂性。

中国主要城市入境旅游网络结构演变分析

基于旅游经济联系模型,运用GIS技术手段,构建中国入境旅游城市的旅游经济联系网络,并对1997年和2010年的Top1、Top5和Top10网络的结构演变特征进行研究。研究发现:①整体网络规模在缩小,但是最大联系强度和平均联系强度却明显增长,且最大联系强度一直出现在广州和深圳之间;②整体网络结构处于核心极化阶段,总体呈现"东部强,中西弱"的"L"型分布,一级节点城市北京、上海和广州的集聚作用显著,且进一步增强;③旅游城市联系以东部区内联系为主,东部地区城市的集聚作用愈加明显,中部和西部地区城市的集聚作用在减弱;④中国入境旅游城市可分为三大体系,形成三极多核的空间格局。