Theory and application of equivalent transformation relationships between plane wave and spherical wave

Based on the governing equations and the equivalent models, we propose an equivalent transformation relationships between a plane wave in a one-dimensional medium and a spherical wave in globular geometry with radially inhomogeneous properties. These equivalent relationships can help us to obtain the analytical solutions of the elastodynamic issues in an inhomogeneous medium. The physical essence of the presented equivalent transformations is the equivalent relationships between the geometry and the material properties. It indicates that the spherical wave problem in globular geometry can be transformed into the plane wave problem in the bar with variable property fields, and its inverse transformation is valid as well. Four different examples of wave motion problems in the inhomogeneous media are solved based on the presented equivalent relationships. We obtain two basic analytical solution forms in Examples I and II, investigate the reflection behavior of inhomogeneous half-space in Example III, and exhibit a special inhomogeneity in Example IV, which can keep the traveling spherical wave in constant amplitude. This study implies that our idea makes solving the associated problem easier.

Pre-existing orthorhombic embryos-induced hexagonal-orthorhombic martensitic transformation in MnNiSi_(1-x)(CoNiGe)_x alloy

The thermal-elastic martensitic transformation from high-temperature Ni_(2)In-type hexagonal structure to low-temperature TiNiSi-type orthorhombic structure has been widely studied in MnMX(M=Ni or Co,and X=Ge or Si)alloys.However,the answer to how the orthorhombic martensite nucleates and grows within the hexagonal parent is still unclear.In this work,the hexagonal-orthorhombic martensitic transformation in a Co and Ge co-substituted MnNiSi is investigated.One can find some orthorhombic laths embedded in the hexagonal parent at a temperature above the martensitic transformation start temperature(M_(s)).With the the sample cooing to M_(s),the laths turn broader,indicating that the martensitic transformation starts from these pre-existing orthorhombic laths.Microstructure observation suggests that these pre-existing orthorhombic laths do not originate from the hexagonal-orthorhombic martensitic transformation because of the difference between atomic occupations of doping elements in the hexagonal parent and those in the preexisting orthorhombic laths.The phenomenological crystallographic theory and experimental investigations prove that the pre-existing orthorhombic lath and generated orthorhombic martensite have the same crystallography relationship to the hexagonal parent.Therefore,the orthorhombic martensite can take these pre-existing laths as embryos and grow up.This work implies that the martensitic transformation in MnNiSi_(1-x)(CoNiGe)_(x) alloy is initiated by orthorhombic embryos.

Three-dimensional transformation of magnetization direction and magnetic field component at low latitudes based on vertical relationship

The transformation of the magnetization direction and the magnetic fi eld component is one of the important methods in magnetic data processing and transformation,which can be conducted in both wavenumber and spatial domains.The transformation method in the wavenumber domain has simpler processing expression and higher processing effi ciency than in the spatial domain;however,they are unstable at low latitude.In this paper,the conclusion that the sum is 0 of two vertical magnetic fi eld components(magnetization inclinations are also perpendicular)in 2D is used for the 3D transformation of the magnetization direction and the magnetic field component.In addition,the transformation method at low latitudes based on vertical relationship(VMT)is proposed,which is an iterative algorithm that converts the transformation of the magnetization direction and the magnetic field component at the low latitude into the high latitude.This method restrains the instability of transformation of constant and variable magnetization direction and magnetic fi eld components in low latitudes.The accuracy,stability,and practicality are verifi ed from synthetic models and real data.

Coupling Relationship Among Technological Innovation,Industrial Transformation and Environmental Efficiency:A Case Study of the Huaihai Economic Zone,China

The 14th Five-Year Plan period is a critical period for China to achieve high-quality development. Based on super-efficiency slacks-based measure(SBM) model, grey-related analysis(GRA) and other models, this paper studies the heterogeneity of the coupling relationship among technological innovation, industrial transformation and environmental efficiency in the Huaihai Economic Zone during the period of 2005-2019. In addition, it analyzes the coupling mechanism of single and binary systems to the ternary system, which is of great significance for the collaborative symbiosis among systems. The findings are as follows. 1) The technological innovation, industrial transformation and environmental efficiency(TIE) systems of the Huaihai Economic Zone had significant spatial-temporal heterogeneity. Although their evaluation value fluctuated, the development trends are all positive. Ultimately, technological innovation is characterized by being high in the northeast and low in the southwest around Xuzhou, while other systems are relatively staggered in space. 2) The coupling of TIE systems is in transition, lack of orderly integration and benign interaction. However, the developing trend of interaction is also upward, and a spatial pattern driven by Xuzhou and Linyi as the dual cores has gradually formed. Moreover, the coupling is mostly manifested as outdated technological innovation and industrial transformation. Except for the final coordination of regenerative cities, the other resource types are all in transition. Cities in all traffic locations are still in transition. The overall system interaction of cities on Longhai Line(Lanzhou-Lianyungang Railway) is relatively optimal, and cities on Xinshi Line(Xinxiang-Rizhao Railway) are accelerating toward synergy. 3) The coupling status of TIE systems depends on the development of the single system and the interaction of the binary(2E) system. The coupling is closely related to technological innovation and Technology-Industry system,and is hindered by the inefficient interaction of Technology-Environment system. Specifically, the synergy of regenerative cities is attributed to the advantage of a single system and the effective integration of 2E systems. Beneficial from the advantages of environmental efficiency, the cities on Xinshi Line promote the synergy of the 2E and TIE systems. Therefore, while the Huaihai Economic Zone stimulates the development potential of the single and 2E systems, it is necessary to amplify the superimposition effect of systems in accordance on the basis of resource and location.

Accurate Registration of Remote Sensing Images Based on Local Optimal Transformation

As the basic work of image stitching and object recognition,image registration played an important part in the image processing field.Much previous work in registration accuracy and realtime performance progressed very slowly,especially in registrating images with line feature.An innovative method for image registration based on lines is proposed,it can effectively improve the accuracy and real-time performance of image registration.The line feature can deal with some registration problems where point feature does not work.Our registration process is divided into two parts.The first part determines the rough registration transformation relation between reference image and test image.Then the similarity degree among different transformation and modified nonmaximum suppression(MNMS)algorithms are obtained,which produce local optimal solution to optimize the rough registration transformation.The final optimal registration relation can be obtained from two registration parts according to the match scores.The experimental results show that the proposed method makes a more accurate registration relation and performs better in real-time situation.

A Crystallography Study of Bainitic Transformation in a Cu-Zn-Al Alloy

The crystallographic nature of initial isothermal phase transformation in Cu-26Zn-4Al (wt-％) was investigated. The kinetic transforma- tion curve, morphology, crystal structure, substructure, orientation relationship and twin relationship of bainite plates have been studied by means of optical and transmission electron microscopy. The experimental results showed that the characteristics of initial 8→bainite transformation are not exactly consistent with that found in martensite transformation, for example, orientation relationship between matrix and bainite does not exist in martensite transformation.

Influence of Network Embedding on the Transformation Performance of Original Equipment Manufactures

Based on the embeddedness theory,this paper analyzes the impact of network embedding features and types on the transformation performance of foundry enterprises.Through the investigation and analysis of more than 200 foundry enterprises in Zhejiang Province,it is found that network relationship embedding and structure embedding have positive impacts on transformation of foundry enterprises.Professional embedding and technical embedding have a positive effect in the transformation of foundry enterprises,and knowledge absorption ability has a positive adjustment role in the transformation performance of network embedding foundry enterprises.

Ontogeny of expression of transforming growth factor-βand its receptors and their possible relationship with scarless or scar-forming healing in human fetal and postnatal skins

Fetal eutaneous wounds that oeeur in earlygestation heal without sear formation.Althoughmueh work has been done to eharaeterize the roleof transforming growth

Between the Heaven and Human Beings: On the Idea of the Heaven and the Transformation of Poetry in the Mid-Tang Dynasty

The relationship between the Heaven and human beings is a central issue in the transformation of Confucianism in the Mid-Tang Dynasty.The discourses on the Heaven by Han Yu,Liu Zongyuan,and Liu Yuxi helped to promote the transformation and greatly influenced the transformation in literature.The differences in the poetry among the three authors may also be interpreted from the perspective of their perceptions of the Heaven—Han Yu’s discourse on the Heaven focused on the enemy-relationship between the Heaven and human beings,so his poems always showed tension and loss.Liu Zongyuan was interested in the alienation between the heaven and human beings,so his poems were more rational and placid than Han Yu’s.However,Liu Yuxi’s discourse on the Heaven paid attention to the positive influence of the Heaven on human beings,and most of his poems were filled with reason.The changes in the relationship between the Heaven and human beings lead to the broadened themes,innovated vocabulary,diversified styles,and varied fresh imageries.Likewise,the relationship between the Heaven and human beings established in the Song Dynasty led accordingly to a new type of literature different from the Tang literature.

基于改进Transformer和超图模型的股票趋势预测方法研究

股票预测是一项令人痴迷又极具挑战的任务。近年来,融合关系信息的股票时序预测方法取得一些进展,但仍存在如下问题:首先,基于图神经网络的方法仅考虑股票之间简单的成对关系,而未考虑股票间的高阶协同关系。其次,现有方法采用预定义图的方式直接给出股票间的静态关系,无法建模股票间潜在的动态变化关系。为了解决上述问题,提出一种端到端的动态超图卷积神经网络股票趋势预测框架。该框架基于改进的Transformer提取股票的时序信息,通过静态超图和动态超图将股票间的协同关系信息引入到时序建模中。在中国A股和美股市场数据集上的实验结果表明,与当前先进模型相比,本文模型的预测性能具有显著优势。

Martensitic transformation pathways and crystallographic orientation relationships in steel

Martensite is one of the most important structures determining the ability to tailor the performance of steel and several other engineering materials.In previous studies,the face-centered cubic(FCC)to hexag-onal close-packed(HCP)(or body-centered cubic(BCC))martensitic transformation and the FCC to body-centered tetragonal(BCT)(or BCC)martensitic transformation during deformation and quenching were widely investigated;these transformations usually improve the plasticity and strength of steel,respec-tively.In this work,detailed transmission electron microscopy(TEM)observations and electron diffraction pattern analyses of the BCT and BCC twins are performed along the[110],[131],and[¯153]zone axes.The transformation of BCT twins into BCC twins along the[131]zone axis is also analyzed through in situ heating during the TEM observations.The high-resolution TEM observations of mutually perpendicular BCT variants are consistent with the atomic arrangement obtained for the quenching pathway during the martensitic transformation.In addition,different orientation relationships between austenite and marten-site are explained in terms of the atomic migration occurring during the deformation pathway and the quenching pathway of the martensitic transformation.

A NEW INTEGRAL TRANSFORM AND ITS APPLICATIONS

In the present paper, the authors introduce a new integral transform which yields a number of potentially useful （known or new） integral transfoms as its special cases. Many fundamental results about this new integral transform, which are established in this paper, in- clude （for example） existence theorem, Parseval-type relationship and inversion formula. The relationship between the new integral transform with the H-function and the H-transform are characterized by means of some integral identities. The introduced transform is also used to find solution to a certain differential equation. Some illustrative examples are also given.

Estimation of Average Relationship Coefficient in Animal Population

It is not reasonable to estimate the average relationship degree in statistics by using the mean of relationship coefficients between the individuals in a animal population.According to different usage of relationship coefficient,the estimation method of average relationship coefficient in animal population was disscussed by using Z transformation or CSC transformation,respectively,when relationship coefficient shows relationship degree or probability.

Image Retrieval Based on Objects’ Spatial Orientation Relationships

A new concept of characteristic scanning radial (CSR) is proposed for thesegmented image on the basis of two shape-specific points of its shape-objects. Subsequently, twocharacteristic attribute sequences (CAS) of relative distance and relative direction are derived torepresent the spatial orientation relationships among objects of the image. A novel image retrievalalgorithm is presented using these two CASs. The proposed retrieval approach not only satisfies thetransformational invariance, butalso attains the quantitative comparison of matching. Experimentsidentify the effectiveness and efficiency of the algorithm adequately.

“外察”与“内省”:环境威胁引发的绿色消费意愿研究——基于道德情绪的双路径模型

营销学者在探究绿色消费议题方面做了众多开创性工作,然而针对诱因不同的环境威胁是否及通过怎样的心理路径影响消费者绿色消费意愿的研究仍然匮乏。本文将环境威胁分为自然因素引发的环境威胁和人为因素引发的环境威胁两类,通过4组实验检验了两类环境威胁影响消费者绿色消费意愿的心理机制。研究结果证实了无论哪类环境威胁,都会对绿色产品购买行为产生积极影响,但不同类型的环境威胁会通过差异化认知过程和情绪反应影响绿色产品购买行为。当消费者面对自然因素引发的环境威胁时,其“外察”思维模式会起主导作用,此时敬畏感是促进绿色产品购买意愿的中介变量;当消费者面对人为因素引发的环境威胁时,其“内省”思维模式会起主导作用,此时内疚感是促进绿色产品购买意愿的中介变量。研究也证实了环境威胁对道德情绪的影响会受自然联结性和道德提升感的调节。

绿色转型:关系调适、基本样态及其发轫机制

经典环境社会学研究聚焦环境问题或环境衰退的学理解剖与理论阐释,呈现“环境衰退论”的叙事特征。为应对环境挑战,人类积极调整人与自然以及人与人之间的关系,推动社会的绿色转型,勾勒出资源消耗迈向资源善用、环境损害迈向生态修复、生态代谢断裂迈向生态循环以及失序发展迈向协调发展的基本轮廓。制度-政策势能、经济-技术变革和社会-文化浪潮构成绿色转型赖以发轫和发展的基本机制,其中,制度-政策势能在中国的绿色转型实践中扮演着关键性角色。当前,绿色转型虽然已不只是学术想象与学术倡导,但这种转型实践还处于趋势性状态,面临着不平衡性、不稳定性和不充分性的挑战。对此,环境社会学需要持续开展更为深入的学理研究。

亲清政商关系与企业数字化转型

在数字经济时代,数字化转型是企业实现高质量发展的内生要求,而企业的数字化转型离不开政府的引导和支持。基于此,分析检验当前亲清政商关系构建会如何影响微观企业的数字化转型,有助于企业实现高质量发展。利用2016—2020年中国A股传统行业上市公司的年度观察数据研究发现,亲清政商关系对企业数字化转型具有显著的正向影响,即在政商关系越亲清的地区,企业的数字化水平越高,并且这种正向影响在非国有企业中表现得更强。进一步的机制检验表明,亲清政商关系主要通过“市场导向效应”和“资源供给效应”对企业数字化转型发挥积极的促进作用。更具有启发意义的是,主要是政商关系的“亲近化”而不是政商关系的“清白化”助力了企业的数字化转型,而且亲清政商关系能够降低传统政治关联的相关影响。

空间视域下思想政治教育一体化的概念、内容及建设

社会发展和社会变迁深刻影响着空间格局,空间成为解析社会现象、反映社会思想观念变化的重要理论和实践场域。空间与社会的互动使人的发展、社会的发展空间趋向合理化,使空间变革愈加富有社会化特质。人的思想观念、情感体验、行为实践、社会关系在一定的空间当中被塑造和完善,空间在思想政治教育一体化的作用下逐渐具有思想政治教育意蕴。在阐释空间视域下思想政治教育一体化的概念、分析其内容的基础上提出空间视域下思想政治教育一体化建设思路和举措:实现社会主流意识形态的广泛传播,在对空间的占有当中筑牢思想政治教育一体化的基础;掌握变革社会的力量,通过对空间主体的培养塑造凝聚思想政治教育一体化的主体力量;促进人与社会关系的和谐,通过对空间关系的协调把握思想政治教育一体化的关键。

基于多特征符号聚合近似和层次聚类的户变关系识别方法

针对低压配电台区拓扑档案中可能存在的户变关系异常问题,文中提出了一种基于多特征符号聚合近似(MF-SAX)和层次聚类的户变关系识别方法。首先,运用符号聚合近似表达方法将用户电压时间序列转化为字符串序列,并引入电压波动系数和电压变化趋势两个附加参数对其特征表达进行强化。然后,基于编辑距离生成用户电压曲线相似性矩阵,并结合层次聚类算法实现户变关系的识别。最后,实际算例结果表明,提出的方法相比于现有方法准确率更高,误报更少,能直接应对数据缺失的情况,且具有更高的效率。

基于欠完备电压数据的户变关系识别方法

当前采集的台区用户数据存在一定比例的缺失,使得传统基于数据驱动的户变关系核查方法难以实际应用。为此,提出一种基于欠完备电压数据的户变关系识别方法。通过掩码自编码器直接从欠完备电压数据中提取特征编码;对特征编码应用参数自适应的基于密度的噪声应用空间聚类(DBSCAN)算法进行聚类,实现低压台区户变关系的准确识别。所提方法无须进行缺失数据填充,避免了数据填充误差对特征提取效果的影响。同时,该方法无须人工调参,降低了工程应用难度,提升了低压台区管理自动化水平。算例结果表明,在缺失率达80%的情况下,所提方法的户变关系识别准确率依然可达80%。