This paper scrutinizes the differences in the conceptualization of love between Korean and American women.Grounded in an analysis of literary figures,Brett and Kim Ji-young,the study unravels the intricate interplay o...This paper scrutinizes the differences in the conceptualization of love between Korean and American women.Grounded in an analysis of literary figures,Brett and Kim Ji-young,the study unravels the intricate interplay of cultural,historical,and societal forces shaping these perspectives.The contrasting landscapes of the United States,driven by ideals of freedom and individualism,and Korea,entrenched in Confucian values and collectivism,serve as crucibles for forming women’s roles,self-perception,and societal expectations.The examination extends to communication styles,illuminating the directness of American expression versus Korea’s reliance on formalism.Through this exploration,the paper illustrates the profound impact of cultural contexts on the intricate tapestry of love,offering a nuanced understanding of divergent viewpoints within a global context.展开更多
The working mechanism and experiential basis of love metaphor are deeply elaborated, and on the base of it, an analysis of love metaphor LOVE IS A JOURNEY from the perspective of cognition is carried out, which furthe...The working mechanism and experiential basis of love metaphor are deeply elaborated, and on the base of it, an analysis of love metaphor LOVE IS A JOURNEY from the perspective of cognition is carried out, which further illustrates the contemporary conceptual metaphor theory.展开更多
Cellular thin-shell structures are widely applied in ultralightweight designs due to their high bearing capacity and strength-to-weight ratio.In this paper,a full-scale isogeometric topology optimization(ITO)method ba...Cellular thin-shell structures are widely applied in ultralightweight designs due to their high bearing capacity and strength-to-weight ratio.In this paper,a full-scale isogeometric topology optimization(ITO)method based on Kirchhoff-Love shells for designing cellular tshin-shell structures with excellent damage tolerance ability is proposed.This method utilizes high-order continuous nonuniform rational B-splines(NURBS)as basis functions for Kirchhoff-Love shell elements.The geometric and analysis models of thin shells are unified by isogeometric analysis(IGA)to avoid geometric approximation error and improve computational accuracy.The topological configurations of thin-shell structures are described by constructing the effective density field on the controlmesh.Local volume constraints are imposed in the proximity of each control point to obtain bone-like cellular structures.To facilitate numerical implementation,the p-norm function is used to aggregate local volume constraints into an equivalent global constraint.Several numerical examples are provided to demonstrate the effectiveness of the proposed method.After simulation and comparative analysis,the results indicate that the cellular thin-shell structures optimized by the proposed method exhibit great load-carrying behavior and high damage robustness.展开更多
The safety accidents caused by collapse column water diversion occur frequently, which has great hidden danger to the safety production of coal mine. Limited by the space of underground, the detection of collapse colu...The safety accidents caused by collapse column water diversion occur frequently, which has great hidden danger to the safety production of coal mine. Limited by the space of underground, the detection of collapse column on the outside of working face has been a difficult problem. Based on this, numerical simulation and imaging research were carried out in this paper. The results indicate that when a seismic source near the roadway is excited, a part of seismic wave propagates along the roadway direction, namely direct P-wave, direct S-wave and direct Love channel wave.<span style="font-family:;" "=""> </span><span style="font-family:Verdana;">When the body waves and Love channel wave propagating to the outside</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">of working face meet the interface of collapse column, the reflected Love channel wave and reflected body waves are generated.</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">Reflection </span><span style="font-family:Verdana;">body </span><span style="font-family:Verdana;">waves and direct waves are mixed in time domain, which is difficult to identify in seismic records, while reflected Love channel wave whose amplitude is relatively strong. The </span><span style="font-family:Verdana;">reflected </span><span style="font-family:Verdana;">Love channel wave which has a large interval from other wave trains in the time domain is easily recognizable in seismic record,</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">which</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">makes it suitable for advanced detection of collapse column. The signal-to-noise ratio of X component is higher than that of Y component and Z component. According to the seismic records, polarization filtering was carried out to enhance the effective wave, which removed the interference waves, and the signal was migrated to get the position parameters of collapse column interface, which was basically consistent with the model position.</span>展开更多
"Edie's Avalanche: Snowed up" is a previously unpublished short story of Richard Jefferies', it has been studied from different approaches. This paper discusses the changing position and love of the ..."Edie's Avalanche: Snowed up" is a previously unpublished short story of Richard Jefferies', it has been studied from different approaches. This paper discusses the changing position and love of the protagonist from feminist approach.展开更多
In the study of metaphor, as a branch of the general cognitive science, cognitive linguistics has been walking forward at all times. In recent years, attention has gradually been paid on the metaphor study in the Chin...In the study of metaphor, as a branch of the general cognitive science, cognitive linguistics has been walking forward at all times. In recent years, attention has gradually been paid on the metaphor study in the Chinese academic circles, and some domestic scholars have carried out research one after another, mainly through some daily expression, poetry, prose or novel to analyze and demonstrate the similarities and differences of love metaphors in Chinese and western culture. The new exploration of the role of metaphor in poetry and the cognitive mechanism was included, and it gained some achievements. The innovation of this paper is that it breaks the confinition to everyday expression, literature, combing with classic and modern songs in English and Chinese, to compare the love metaphor in English and Chinese songs.展开更多
Metaphor is a figure of speech in which one thing is compared to another by saying that A is B or using words as"as"or"like".Love is human beings’eternal theme.Studying love metaphors in both Engl...Metaphor is a figure of speech in which one thing is compared to another by saying that A is B or using words as"as"or"like".Love is human beings’eternal theme.Studying love metaphors in both English and Chinese language from the perspective of cognition can help people understand the working mechanism of love metaphors better.展开更多
Love is a so abstract concept that it always be conveyed through metaphors.In order to reveal how the Chinese and English poetry sets metaphors for love,this article probes into large number of examples of love metaph...Love is a so abstract concept that it always be conveyed through metaphors.In order to reveal how the Chinese and English poetry sets metaphors for love,this article probes into large number of examples of love metaphor and concludes that love metaphors in English and Chinese poetry shares the same conceptual system due to the common natures of human being.On the other hand,the differences in thinking mode and religious value result in their different points.Love metaphors in Chinese poetry are more subtle,reserved,and restrained,which corresponds to the national characteristics of Chinese people;while those in English poetry are more bold,passionate,and romantic,which are also associated with the features of western culture.展开更多
Louise Erdrich is one of the most important contemporary American writers in America.Her first Novel Love Medicine won most prizes in American literature history.Most researches in America and China on the novel from ...Louise Erdrich is one of the most important contemporary American writers in America.Her first Novel Love Medicine won most prizes in American literature history.Most researches in America and China on the novel from the perspectives of feminism,post- colonialism,ecocriticism.The themes in the novel such as love,home- coming,identity construction have also been discussed.展开更多
Love is an eternal theme of world literature.Both the ancient and the modern literature tend to take marriage and love as their paramount theme;however,there is rarely any research sorting out these themes from the pe...Love is an eternal theme of world literature.Both the ancient and the modern literature tend to take marriage and love as their paramount theme;however,there is rarely any research sorting out these themes from the perspective of cultural difference.Being engaged in exploring the love literature,this paper intends to make a comparison with Chinese and western perspectives of love and analyzes the embodied culture essences and differences from the comparative researches on their literary status,attitudes towards love,and the choice of themes.展开更多
The outstanding female protagonist Scarlett O'Hara in Gone with the Wind is full of conflicting and complicated features, who is the daughter of a rich plantation owner. Based on the background of American Civil W...The outstanding female protagonist Scarlett O'Hara in Gone with the Wind is full of conflicting and complicated features, who is the daughter of a rich plantation owner. Based on the background of American Civil War, this novel depicts Scarlett's love tragedy with the clue of the triangular love between Scarlett, Ashley and Rhett.展开更多
This paper makes studies on God's love as a theme through the whole Old Testament. First the paper points out the impact of modern science and technology on people's thoughts and opinions about religions, whil...This paper makes studies on God's love as a theme through the whole Old Testament. First the paper points out the impact of modern science and technology on people's thoughts and opinions about religions, while laying emphasis on the concept"God's love"and then the paper tracks the deep and great love through Old Testament, trying to demonstrate it in all directions.展开更多
Died just last January,J.D.Salinger is an American writer widely beloved,mostly by adolescent readers.While his most famous novel,The Catcher in the Rye,was controversial at first when publicized,his other work Franny...Died just last January,J.D.Salinger is an American writer widely beloved,mostly by adolescent readers.While his most famous novel,The Catcher in the Rye,was controversial at first when publicized,his other work Franny and Zooey is controversial even till today.While some people regard it as a true gem,others think it's only a stinker.I will,in this article,bring its theme out of surface by citing extracts and analysizing them and give the reasons why I consider it a masterpiece.展开更多
This article discusses that the development of new criticism is the anti-romantic thrust of Eliot’s thinking. Famously he wrote: "Poetry is not a turning loose of emotion, but an escape from emotion; it is not t...This article discusses that the development of new criticism is the anti-romantic thrust of Eliot’s thinking. Famously he wrote: "Poetry is not a turning loose of emotion, but an escape from emotion; it is not the expression of personality, but an escape from personality". The Love Song of J.Alfred Prufrock is a poem with a notable modern emotional coloring.The title of the poem is ironic in that the "Love Song" is in fact about the absence of love. It is interesting also for its method of presentation.Eliot’s poetry said more about the moden chaos and their volumes put together.展开更多
We investigate analytically the effect of initial stress in piezoelectric layered structures loaded with viscous liquid on the dispersive and attenuated characteristics of Love waves, which involves a thin piezoelectr...We investigate analytically the effect of initial stress in piezoelectric layered structures loaded with viscous liquid on the dispersive and attenuated characteristics of Love waves, which involves a thin piezoelectric layer bonded perfectly to an unbounded elastic substrate. The effects of initial stress in the piezoelectric layer and the viscous coefficient of the liquid on the phase velocity of Love waves are analyzed. Numerical results are presented and discussed. The analytical method and the results can be useful for the design of chemical and biosensing liquid sensors.展开更多
We estimate Love wave empirical Green's functions from cross-correlations of ambient seismic noise to study the crust and uppermost mantle structure in Italy. Transverse-component ambient noise data from October 2005...We estimate Love wave empirical Green's functions from cross-correlations of ambient seismic noise to study the crust and uppermost mantle structure in Italy. Transverse-component ambient noise data from October 2005 through March 2007 recorded at 114 seismic stations from the Istituto Nazionale di Geofisica e Vulcanologia (INGV) national broadband network, the Mediterranean Very Broadband Seismographic Network (MedNet) and the Austrian Central Institute for Meteorology and Geodynamics (ZAMG) yield more than 2 000 Love wave group velocity measurements using the multiple-filter analysis technique. In the short period band (5-20 s), the cross-correlations show clearly one-sided asymmetric feature due to non-tmiform noise distribution and high local activities, and in the long period band (〉20 s) this feature becomes weak owing to more diffusive noise distribution. Based on these measurements, Love wave group velocity dispersion maps in the 8-34 s period band are constructed, then the SH wave velocity structures from the Love wave dispersions are inverted. The final results obtained from Love wave data are overall in good agreement with those from Rayleigh waves. Both Love and Rayleigh wave inversions all reveal that the Po plain basin is resolved with low velocity at shallow depth, and the Tyrrhenian sea is characterized with higher velocity below 8 km due to its thin oceanic crust.展开更多
Coal seams have a pronounced bedding structure with developed cracks and exhibit signifi cant anisotropy.However,few studies have examined the frequency dispersion properties of channel waves in anisotropic coal seams...Coal seams have a pronounced bedding structure with developed cracks and exhibit signifi cant anisotropy.However,few studies have examined the frequency dispersion properties of channel waves in anisotropic coal seams.In this study,numerical solutions are calculated using the generalized reflection–transmission coefficient method for the dispersion curves of Love channel waves in vertical transversely isotropic(VTI)and horizontal transversely isotropic(HTI)medium models.Moreover,the frequency dispersion characteristics of Love channel waves in several typical transversely isotropic models are analyzed.We fi nd that the dispersion curves for isotropic and VTI media diff er signifi cantly.In addition,the phase and Airy-phase velocities in VTI media are higher than those in isotropic media.Thus,neglecting this difference in practical channel wave detection will result in large detection errors.The dispersion curves for the isotropic and HTI media do not differ signifi cantly,and the Airy-phase velocities of various modes are similar.The group-velocity curve for a coal seam model containing a dirt band is found to be extremely irregular.The fundamental-mode Airy phase is not pronounced,but the fi rst-mode Airy phase can be clearly observed.Hence,fi rst-mode channel waves are suitable for detecting dirt bands.展开更多
Research on the propagation of elastic waves in piezoelectric nanostructures is very limited. The frequency dispersion of Love waves in layered piezoelectric nanostructures has not yet been reported when surface effec...Research on the propagation of elastic waves in piezoelectric nanostructures is very limited. The frequency dispersion of Love waves in layered piezoelectric nanostructures has not yet been reported when surface effects are taken into account. Based on the surface elasticity theory, the propagation of Love waves with surface effects in a structure consisting of a nanosized piezoelectric film and a semi-infinite elastic substrate is investigated focusing on the frequency dispersion curves of different modes. The results show that under the electrically-open conditions, surface effects give rise to the dependence of Love wave dispersion on the film thickness when the thickness of the piezoelectric film reduces to nanometers. For a given wave frequency, phase velocity of Love waves in all dispersion modes exhibit obvious toward shift as the film thickness decreases or the surface parameters increase. Moreover, there may exist a cut-off frequency in the first mode dispersion below which Love waves will be evanescent in the structure due to surface effects. The cut-off frequency depends on the film thickness, the surface parameters and the bulk material properties.展开更多
In this article, we have derived a new and more general formulation of Love waves in arbitrarily irregular multi-layered media by using the global generalized reflection/transmission (abbreviated to R/T thereafter) ma...In this article, we have derived a new and more general formulation of Love waves in arbitrarily irregular multi-layered media by using the global generalized reflection/transmission (abbreviated to R/T thereafter) matrices method developed earlier by Chen [17~20]. From the basic principle that the modal solutions are the non-trivial solutions of the free elastodynamic equation under appropriate boundary conditions, we naturally derived the characteristic frequencies and the corresponding distorted modes of Love wave in irregular multi-layered media. Moreover, we have derived the corresponding excitation formulation of Love waves in such laterally heterogeneous media by using the general solution of elastodynamic equation [17~20]. Similar to the result for laterally homogeneous layered structure, the Love waves radiated from a point source in irregular multi-layered media can be expressed as a superposition of distorted modes. Since the structure model used here is quite arbitrary, it can be used for展开更多
文摘This paper scrutinizes the differences in the conceptualization of love between Korean and American women.Grounded in an analysis of literary figures,Brett and Kim Ji-young,the study unravels the intricate interplay of cultural,historical,and societal forces shaping these perspectives.The contrasting landscapes of the United States,driven by ideals of freedom and individualism,and Korea,entrenched in Confucian values and collectivism,serve as crucibles for forming women’s roles,self-perception,and societal expectations.The examination extends to communication styles,illuminating the directness of American expression versus Korea’s reliance on formalism.Through this exploration,the paper illustrates the profound impact of cultural contexts on the intricate tapestry of love,offering a nuanced understanding of divergent viewpoints within a global context.
文摘The working mechanism and experiential basis of love metaphor are deeply elaborated, and on the base of it, an analysis of love metaphor LOVE IS A JOURNEY from the perspective of cognition is carried out, which further illustrates the contemporary conceptual metaphor theory.
基金supported by the National Key R&D Program of China(Grant Number 2020YFB1708300)China National Postdoctoral Program for Innovative Talents(Grant Number BX20220124)+1 种基金China Postdoctoral Science Foundation(Grant Number 2022M710055)the New Cornerstone Science Foundation through the XPLORER PRIZE,the Knowledge Innovation Program of Wuhan-Shuguang,the Young Top-Notch Talent Cultivation Program of Hubei Province and the Taihu Lake Innovation Fund for Future Technology(Grant Number HUST:2023-B-7).
文摘Cellular thin-shell structures are widely applied in ultralightweight designs due to their high bearing capacity and strength-to-weight ratio.In this paper,a full-scale isogeometric topology optimization(ITO)method based on Kirchhoff-Love shells for designing cellular tshin-shell structures with excellent damage tolerance ability is proposed.This method utilizes high-order continuous nonuniform rational B-splines(NURBS)as basis functions for Kirchhoff-Love shell elements.The geometric and analysis models of thin shells are unified by isogeometric analysis(IGA)to avoid geometric approximation error and improve computational accuracy.The topological configurations of thin-shell structures are described by constructing the effective density field on the controlmesh.Local volume constraints are imposed in the proximity of each control point to obtain bone-like cellular structures.To facilitate numerical implementation,the p-norm function is used to aggregate local volume constraints into an equivalent global constraint.Several numerical examples are provided to demonstrate the effectiveness of the proposed method.After simulation and comparative analysis,the results indicate that the cellular thin-shell structures optimized by the proposed method exhibit great load-carrying behavior and high damage robustness.
文摘The safety accidents caused by collapse column water diversion occur frequently, which has great hidden danger to the safety production of coal mine. Limited by the space of underground, the detection of collapse column on the outside of working face has been a difficult problem. Based on this, numerical simulation and imaging research were carried out in this paper. The results indicate that when a seismic source near the roadway is excited, a part of seismic wave propagates along the roadway direction, namely direct P-wave, direct S-wave and direct Love channel wave.<span style="font-family:;" "=""> </span><span style="font-family:Verdana;">When the body waves and Love channel wave propagating to the outside</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">of working face meet the interface of collapse column, the reflected Love channel wave and reflected body waves are generated.</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">Reflection </span><span style="font-family:Verdana;">body </span><span style="font-family:Verdana;">waves and direct waves are mixed in time domain, which is difficult to identify in seismic records, while reflected Love channel wave whose amplitude is relatively strong. The </span><span style="font-family:Verdana;">reflected </span><span style="font-family:Verdana;">Love channel wave which has a large interval from other wave trains in the time domain is easily recognizable in seismic record,</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">which</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">makes it suitable for advanced detection of collapse column. The signal-to-noise ratio of X component is higher than that of Y component and Z component. According to the seismic records, polarization filtering was carried out to enhance the effective wave, which removed the interference waves, and the signal was migrated to get the position parameters of collapse column interface, which was basically consistent with the model position.</span>
文摘"Edie's Avalanche: Snowed up" is a previously unpublished short story of Richard Jefferies', it has been studied from different approaches. This paper discusses the changing position and love of the protagonist from feminist approach.
文摘In the study of metaphor, as a branch of the general cognitive science, cognitive linguistics has been walking forward at all times. In recent years, attention has gradually been paid on the metaphor study in the Chinese academic circles, and some domestic scholars have carried out research one after another, mainly through some daily expression, poetry, prose or novel to analyze and demonstrate the similarities and differences of love metaphors in Chinese and western culture. The new exploration of the role of metaphor in poetry and the cognitive mechanism was included, and it gained some achievements. The innovation of this paper is that it breaks the confinition to everyday expression, literature, combing with classic and modern songs in English and Chinese, to compare the love metaphor in English and Chinese songs.
文摘Metaphor is a figure of speech in which one thing is compared to another by saying that A is B or using words as"as"or"like".Love is human beings’eternal theme.Studying love metaphors in both English and Chinese language from the perspective of cognition can help people understand the working mechanism of love metaphors better.
文摘Love is a so abstract concept that it always be conveyed through metaphors.In order to reveal how the Chinese and English poetry sets metaphors for love,this article probes into large number of examples of love metaphor and concludes that love metaphors in English and Chinese poetry shares the same conceptual system due to the common natures of human being.On the other hand,the differences in thinking mode and religious value result in their different points.Love metaphors in Chinese poetry are more subtle,reserved,and restrained,which corresponds to the national characteristics of Chinese people;while those in English poetry are more bold,passionate,and romantic,which are also associated with the features of western culture.
文摘Louise Erdrich is one of the most important contemporary American writers in America.Her first Novel Love Medicine won most prizes in American literature history.Most researches in America and China on the novel from the perspectives of feminism,post- colonialism,ecocriticism.The themes in the novel such as love,home- coming,identity construction have also been discussed.
文摘Love is an eternal theme of world literature.Both the ancient and the modern literature tend to take marriage and love as their paramount theme;however,there is rarely any research sorting out these themes from the perspective of cultural difference.Being engaged in exploring the love literature,this paper intends to make a comparison with Chinese and western perspectives of love and analyzes the embodied culture essences and differences from the comparative researches on their literary status,attitudes towards love,and the choice of themes.
文摘The outstanding female protagonist Scarlett O'Hara in Gone with the Wind is full of conflicting and complicated features, who is the daughter of a rich plantation owner. Based on the background of American Civil War, this novel depicts Scarlett's love tragedy with the clue of the triangular love between Scarlett, Ashley and Rhett.
文摘This paper makes studies on God's love as a theme through the whole Old Testament. First the paper points out the impact of modern science and technology on people's thoughts and opinions about religions, while laying emphasis on the concept"God's love"and then the paper tracks the deep and great love through Old Testament, trying to demonstrate it in all directions.
文摘Died just last January,J.D.Salinger is an American writer widely beloved,mostly by adolescent readers.While his most famous novel,The Catcher in the Rye,was controversial at first when publicized,his other work Franny and Zooey is controversial even till today.While some people regard it as a true gem,others think it's only a stinker.I will,in this article,bring its theme out of surface by citing extracts and analysizing them and give the reasons why I consider it a masterpiece.
文摘This article discusses that the development of new criticism is the anti-romantic thrust of Eliot’s thinking. Famously he wrote: "Poetry is not a turning loose of emotion, but an escape from emotion; it is not the expression of personality, but an escape from personality". The Love Song of J.Alfred Prufrock is a poem with a notable modern emotional coloring.The title of the poem is ironic in that the "Love Song" is in fact about the absence of love. It is interesting also for its method of presentation.Eliot’s poetry said more about the moden chaos and their volumes put together.
基金supported by the National Natural Science Foundation of China(No.10772087)K.C.Wong Education Foundation, Hong Kong and K.C.Wong Magna Fund in Ningbo University.
文摘We investigate analytically the effect of initial stress in piezoelectric layered structures loaded with viscous liquid on the dispersive and attenuated characteristics of Love waves, which involves a thin piezoelectric layer bonded perfectly to an unbounded elastic substrate. The effects of initial stress in the piezoelectric layer and the viscous coefficient of the liquid on the phase velocity of Love waves are analyzed. Numerical results are presented and discussed. The analytical method and the results can be useful for the design of chemical and biosensing liquid sensors.
基金supported in part by the 2004-2006 National Civil Defense Project of Italy (DPC)-S4, 2007-2009 DPC-S3the Fundamental Research Funds for the Central Universities of China under grant No. 2010ZD06
文摘We estimate Love wave empirical Green's functions from cross-correlations of ambient seismic noise to study the crust and uppermost mantle structure in Italy. Transverse-component ambient noise data from October 2005 through March 2007 recorded at 114 seismic stations from the Istituto Nazionale di Geofisica e Vulcanologia (INGV) national broadband network, the Mediterranean Very Broadband Seismographic Network (MedNet) and the Austrian Central Institute for Meteorology and Geodynamics (ZAMG) yield more than 2 000 Love wave group velocity measurements using the multiple-filter analysis technique. In the short period band (5-20 s), the cross-correlations show clearly one-sided asymmetric feature due to non-tmiform noise distribution and high local activities, and in the long period band (〉20 s) this feature becomes weak owing to more diffusive noise distribution. Based on these measurements, Love wave group velocity dispersion maps in the 8-34 s period band are constructed, then the SH wave velocity structures from the Love wave dispersions are inverted. The final results obtained from Love wave data are overall in good agreement with those from Rayleigh waves. Both Love and Rayleigh wave inversions all reveal that the Po plain basin is resolved with low velocity at shallow depth, and the Tyrrhenian sea is characterized with higher velocity below 8 km due to its thin oceanic crust.
基金supported by the National Key R&D Program of China (No. 2018YFC0807804-3)Key R&D Program of Anhui Province (No. 1804a0802213)Scientifi c Research Foundation for the introduction talent of Anhui University of Science and Technology。
文摘Coal seams have a pronounced bedding structure with developed cracks and exhibit signifi cant anisotropy.However,few studies have examined the frequency dispersion properties of channel waves in anisotropic coal seams.In this study,numerical solutions are calculated using the generalized reflection–transmission coefficient method for the dispersion curves of Love channel waves in vertical transversely isotropic(VTI)and horizontal transversely isotropic(HTI)medium models.Moreover,the frequency dispersion characteristics of Love channel waves in several typical transversely isotropic models are analyzed.We fi nd that the dispersion curves for isotropic and VTI media diff er signifi cantly.In addition,the phase and Airy-phase velocities in VTI media are higher than those in isotropic media.Thus,neglecting this difference in practical channel wave detection will result in large detection errors.The dispersion curves for the isotropic and HTI media do not differ signifi cantly,and the Airy-phase velocities of various modes are similar.The group-velocity curve for a coal seam model containing a dirt band is found to be extremely irregular.The fundamental-mode Airy phase is not pronounced,but the fi rst-mode Airy phase can be clearly observed.Hence,fi rst-mode channel waves are suitable for detecting dirt bands.
基金Supported by National Natural Science Foundation of China(Grant No.11372261)Excellent Young Scientists Supporting Project of Science and Technology Department of Sichuan Province,China(Grant No.2013JQ0030)+4 种基金Supporting Project of Department of Education of Sichuan Province,China(Grant No.2014zd3132)Opening Project of Key Laboratory of Testing Technology for Manufacturing ProcessSouthwest University of Science and Technology-Ministry of Education,China(Grant No.12zxzk02)Fund of Doctoral Research of Southwest University of Science and Technology,China(Grant No.12zx7106)Postgraduate Innovation Fund of Southwest University of Science and Technology,China(Grant No.15ycx128)
文摘Research on the propagation of elastic waves in piezoelectric nanostructures is very limited. The frequency dispersion of Love waves in layered piezoelectric nanostructures has not yet been reported when surface effects are taken into account. Based on the surface elasticity theory, the propagation of Love waves with surface effects in a structure consisting of a nanosized piezoelectric film and a semi-infinite elastic substrate is investigated focusing on the frequency dispersion curves of different modes. The results show that under the electrically-open conditions, surface effects give rise to the dependence of Love wave dispersion on the film thickness when the thickness of the piezoelectric film reduces to nanometers. For a given wave frequency, phase velocity of Love waves in all dispersion modes exhibit obvious toward shift as the film thickness decreases or the surface parameters increase. Moreover, there may exist a cut-off frequency in the first mode dispersion below which Love waves will be evanescent in the structure due to surface effects. The cut-off frequency depends on the film thickness, the surface parameters and the bulk material properties.
文摘In this article, we have derived a new and more general formulation of Love waves in arbitrarily irregular multi-layered media by using the global generalized reflection/transmission (abbreviated to R/T thereafter) matrices method developed earlier by Chen [17~20]. From the basic principle that the modal solutions are the non-trivial solutions of the free elastodynamic equation under appropriate boundary conditions, we naturally derived the characteristic frequencies and the corresponding distorted modes of Love wave in irregular multi-layered media. Moreover, we have derived the corresponding excitation formulation of Love waves in such laterally heterogeneous media by using the general solution of elastodynamic equation [17~20]. Similar to the result for laterally homogeneous layered structure, the Love waves radiated from a point source in irregular multi-layered media can be expressed as a superposition of distorted modes. Since the structure model used here is quite arbitrary, it can be used for