Thermal illusion aims to create fake thermal signals or hide the thermal target from the background thermal field to mislead infrared observers,and illusion thermotics was proposed to regulate heat flux with artificia...Thermal illusion aims to create fake thermal signals or hide the thermal target from the background thermal field to mislead infrared observers,and illusion thermotics was proposed to regulate heat flux with artificially structured metamaterials for thermal illusion.Most theoretical and experimental works on illusion thermotics focus on two-dimensional materials,while heat transfer in real three-dimensional(3D)objects remains elusive,so the general 3D illusion thermotics is urgently demanded.In this study,we propose a general method to design 3D thermal illusion metamaterials with varying illusions at different sizes and positions.To validate the generality of the 3D method for thermal illusion metamaterials,we realize thermal functionalities of thermal shifting,splitting,trapping,amplifying and compressing.In addition,we propose a special way to simplify the design method under the condition that the size of illusion target is equal to the size of original heat source.The 3D thermal illusion metamaterial paves a general way for illusion thermotics and triggers the exploration of illusion metamaterials for more functionalities and applications.展开更多
Background: The neural representation of the body is easily altered by integrating multiple sensory signals in the brain. The “Rubber Hand Illusion” (RHI) is one of the most popular experimental paradigms to investi...Background: The neural representation of the body is easily altered by integrating multiple sensory signals in the brain. The “Rubber Hand Illusion” (RHI) is one of the most popular experimental paradigms to investigate this phenomenon. During this illusion, ownership of a rubber hand is temporarily induced. It was shown that external and continuous cooling of the palm enhanced the RHI, suggesting an association between altered the autonomic nervous system regulation and altered the sense of ownership of a specific limb. Purpose: To investigate whether artificially cooling the entire hand for a short period affects the magnitude of the illusion. Methods: Participants immersed their entire hand in cool, cold, or warm water for 1 min before the RHI procedure. Results: We found that cooling the entire hand enhanced the proprioceptive drift during the RHI but not the subjective feeling of ownership. In contrast, warming and intense cooling of the entire hand did not affect the RHI strength. Conclusion: Our results suggest that transient and moderate cooling of the entire hand was sufficient in enhancing the illusory disembodiment of one’s own hand.展开更多
Source illusion is an important issue in acoustic fields that has significant applications in various practical scenarios.Recent progress in acoustic metasurfaces has broken the limitation of manipulating large-scale ...Source illusion is an important issue in acoustic fields that has significant applications in various practical scenarios.Recent progress in acoustic metasurfaces has broken the limitation of manipulating large-scale waves at subwavelength scales and enables a better illusion capability,while there is still a problem that most previous studies are hampered by a lack of tuning capability.Here we propose a reconfigurable source illusion device capable of providing azimuthallydependent phase delay in real-time via changing the static voltage distribution.The resulting device is implemented by employing an adjustable piezoelectric metasurface with a subwavelength thickness that can achieve a full 2π-phase shift while maintaining efficient transmittance.The effectiveness of our mechanism is demonstrated via two distinctive source illusion phenomena of shifting and transforming a simple point source without changing the device geometry.We anticipate that our methodology,which does not require a large device size or a complicated phased array,will open up new avenues for the miniaturization and integration of source illusion devices and may promote their on-chip applications in a variety of fields,such as acoustic camouflage and manipulation precision.展开更多
Recent advancements in the Vehicular Ad-hoc Network(VANET)have tremendously addressed road-related challenges.Specifically,Named Data Networking(NDN)in VANET has emerged as a vital technology due to its outstanding fe...Recent advancements in the Vehicular Ad-hoc Network(VANET)have tremendously addressed road-related challenges.Specifically,Named Data Networking(NDN)in VANET has emerged as a vital technology due to its outstanding features.However,the NDN communication framework fails to address two important issues.The current NDN employs a pull-based content retrieval network,which is inefficient in disseminating crucial content in Vehicular Named Data Networking(VNDN).Additionally,VNDN is vulnerable to illusion attackers due to the administrative-less network of autonomous vehicles.Although various solutions have been proposed for detecting vehicles’behavior,they inadequately addressed the challenges specific to VNDN.To deal with these two issues,we propose a novel push-based crucial content dissemination scheme that extends the scope of VNDN from pullbased content retrieval to a push-based content forwarding mechanism.In addition,we exploitMachine Learning(ML)techniques within VNDN to detect the behavior of vehicles and classify them as attackers or legitimate.We trained and tested our system on the publicly accessible dataset Vehicular Reference Misbehavior(VeReMi).We employed fiveML classification algorithms and constructed the bestmodel for illusion attack detection.Our results indicate that RandomForest(RF)achieved excellent accuracy in detecting all illusion attack types in VeReMi,with an accuracy rate of 100%for type 1 and type 2,96%for type 4 and type 16,and 95%for type 8.Thus,RF can effectively evaluate the behavior of vehicles and identify attacker vehicles with high accuracy.The ultimate goal of our research is to improve content exchange and secureVNDNfromattackers.Thus,ourML-based attack detection and preventionmechanismensures trustworthy content dissemination and prevents attacker vehicles from sharing misleading information in VNDN.展开更多
In modern Chinese style garden, the designer could express the emotions in garden creation to produce artistic conception with landscape plants, which could make the sightseers desire to integrate with the nature and ...In modern Chinese style garden, the designer could express the emotions in garden creation to produce artistic conception with landscape plants, which could make the sightseers desire to integrate with the nature and led to sympathizing with the concept, thereby motivating and arousing people's emotion to return to and close to nature. Through the 6 specific characteristics of "shape, color, aroma, shadow, sound and art" of landscape plants, some ways to build artistic conception in Chinese style garden were introduced in this study to provide references for the creation of artistic conception creation through senses in the future landscaping design.展开更多
There are a great many escapists in modern American drama, who indulge in their past or escape into the fort of dream. Great change of society, as well as traditional values, gives an impact on the escapists. They fee...There are a great many escapists in modern American drama, who indulge in their past or escape into the fort of dream. Great change of society, as well as traditional values, gives an impact on the escapists. They feel mixed-up and perplexed about their lives and future. The conflicts among pursuit and disillusionment, past and present, tradition and modernity, material and spirit, ideal and reality make the escapists choose to build a wall to separate them from the real world. They become the souls drifting in the reality, without knowing their status in society or the meaning of life.展开更多
Objective The Müller-Lycr illusion is a visual illusion in which a horizontal shaft with an inward-pointing chevron (fins-out) affixed to each end is perceived longer than a shaft with outward-pointing chevrons...Objective The Müller-Lycr illusion is a visual illusion in which a horizontal shaft with an inward-pointing chevron (fins-out) affixed to each end is perceived longer than a shaft with outward-pointing chevrons (fins-in). The goal of this study was to compare the effects of experience and knowledge about the Müller-Lyer illusion on participants' perceptual precision. Method Participants were undergraduate students (n = 108) who were not familiar with the Müller-Lyer illusion prior to the experiment. The task of participants was to adjust one movable line to make it equal to the other in Müller-Lyer figure. They received ascending and descending Müller-Lyer trials in three blocks with 20 trials each. The Experimental Group received information about the Müller-Lyer illusion prior to the third block. Results For the Experimental Group, the amount of departure in Block 3 was reduced significantly compared with previous blocks. Conclusion Knowledge about the mechanisms underlying visual illusions may play an important role in helping individuals overcome them.展开更多
In a one-dimension Mauldin-Williams Random Cantor Set Universe, the Sigalotti topological speed of light is where . It follows then that the corresponding topological acceleration must be a golden mean downscali...In a one-dimension Mauldin-Williams Random Cantor Set Universe, the Sigalotti topological speed of light is where . It follows then that the corresponding topological acceleration must be a golden mean downscaling of c namely . Since the maximal height in the one-dimensional universe must be where is the unit interval length and note that the topological mass (m) and topological dimension (D) where m = D = 5 are that of the largest unit sphere volume, we can conclude that the potential energy of classical mechanics translates to . Remembering that the kinetic energy is , then by the same logic we see that when m = 5 is replaced by for reasons which are explained in the main body of the present work. Adding both expressions together, we find Einstein’s maximal energy . As a general conclusion, we note that within high energy cosmology, the sharp distinction between potential energy and kinetic energy of classical mechanics is blurred on the cosmic scale. Apart of being an original contribution, the article presents an almost complete bibliography on the Cantorian-fractal spacetime theory.展开更多
In psychology, the concept of interpretation has been namely associated to the subjectivist paradigm underpinning qualitative approaches, rather than the objectivist paradigm charactefising quantitative research. In t...In psychology, the concept of interpretation has been namely associated to the subjectivist paradigm underpinning qualitative approaches, rather than the objectivist paradigm charactefising quantitative research. In this article, we challenge this belief by showing how interpretation concerns psychology as a whole. To do this, the authors will first consider some dominant tendencies characterising the psychological field in general, such as the "empiricist illusion" and the "trap of scientism" (Vygotsky 1999). Moreover, they will introduce the cultural perspective in psychology, pertinent to deconstruct several assumptions regarding research within the discipline. Stemming from this approach, "indirect methods" will be presented with regard to their potential to analyse psychological phenomena both qualitatively and scientifically. They will conclude by describing a set of principles that can be implemented when doing qualitative research as to ensure the quality and the adequacy of interpretation.展开更多
We will discuss here the tension between the reality of new media and narratological theory, and the case in point will be cinema. Our thesis is that new media have to do with illusion, basically with illusion, and on...We will discuss here the tension between the reality of new media and narratological theory, and the case in point will be cinema. Our thesis is that new media have to do with illusion, basically with illusion, and only derivatively with imagination; on the contrary, the field of literature has to do with imagination, strictly with imagination, not with illusion at all. If it is so, something must be wrong with the pretence of narratology, which has literature as its basic referent, to be the adequate theoretical frame in order to understand every cultural phenomenon, especially in the case of new media. We have to insist on the distinction between illusion and imagination. In fact, most literary theorists do not bear in mind such distinction; it tends to completely disappear under the general title "fiction." To be sure, it is usually said of cinema that it is fiction, like literature, but cinema is much more than fiction, it is illusion, even if it is the illusion of a story.展开更多
Since the concept of invisible cloak was proposed by Pendry and Leonhardt in 2006, many researchers have applied the theory of coordinate transformation to thermodynamics and overcome the complexity of inhomogeneous a...Since the concept of invisible cloak was proposed by Pendry and Leonhardt in 2006, many researchers have applied the theory of coordinate transformation to thermodynamics and overcome the complexity of inhomogeneous and anisotropic of material parameters. However, only two-dimensional(2 D) thermal illusion devices are researched recently. According to this situation, our study focuses on three-dimensional(3 D) thermal illusion devices including shrinker(or invisible cloak),concentrator, amplifier, reshaper, and rotator with arbitrary shape in a general way. In this paper, the corresponding material parameters of thermal illusion devices mentioned above are derived based on the theory of transformation thermodynamics and the simulated results agree well with the theoretical derivations. In addition, the conventional invisible cloak just controls the temperature gradient rather than the temperature value which is more concerned in physical applications. Here,we find that the temperature value of the cloaked object can be controlled by adjusting the location of the original point of the coordinate system.展开更多
Reusable reciprocal invisibility and phantom device is proposed and designed based on multi-folded transformation optics and equivalent components. In comparison with the reported reciprocal invisibility cloaks, the m...Reusable reciprocal invisibility and phantom device is proposed and designed based on multi-folded transformation optics and equivalent components. In comparison with the reported reciprocal invisibility cloaks, the material parameters of the device presented here are homogeneous, and the hiding of the target object does not require any “anti-object” at all,which dramatically breaks through the limitations of the “anti-object” design in previous reciprocal cloak design. Perfectly illusion effect is also found by reasonably setting the material parameters of the restored medium of the device, which can be used to confuse detection radars while hiding target objects. Last but not least, the proposed device has an open structure,which enables the target object enclosed by the device to perform material exchange and simplex transfer of information with the outside world through open channels. In other words, the proposed device has a reusable function, enabling stealth or phantom of new target objects without changing any parameters of the device.展开更多
On the basis of transformation thermodynamics and compensation medium theory, we develop a method to design a two-dimensional thermal illusion device with arbitrary shape, and the general expression of thermal conduct...On the basis of transformation thermodynamics and compensation medium theory, we develop a method to design a two-dimensional thermal illusion device with arbitrary shape, and the general expression of thermal conductivity in the each region is obtained. Simulation results show that when an object is covered with the thermal illusion device, it will accurately perform the same temperature distribution signature as another object we have predetermined. Owing to the property of deceiving and interfering with the observer, the thermal illusion device can achieve generalized thermal stealth by using thermal metamaterials, which may have a potential application in military field.展开更多
While the literature on inflation and stock prices is plentiful,there is little literature on deflation and stock prices.This paper explores the empirical data and makes a theoretical analysis of the likely impact on ...While the literature on inflation and stock prices is plentiful,there is little literature on deflation and stock prices.This paper explores the empirical data and makes a theoretical analysis of the likely impact on stock prices when expectations change from inflation to deflation.Deflation has a bad name among some economists and most investors.However,from a stock market perspective,deflations’bad name may not be well-deserved.Several observations support this:1)The 1930s was a statistical outlier and not representative for a deflationary period and deflation does not seem to create recessions,causality goes the other way;2)real stock returns are positive and around average in the periods leading up to and following the onset of deflation;3)when moving from low inflation to mild deflation,P/E ratios are virtually unchanged;and 4)peak P/E ratios seem to be reached at inflation rates close to zero.The author proposes three possible explanations for the seemingly disconnect between the empirical data and the“default”ex ante belief of most economists and investors:availability heurist,deflation illusion,and tax related issues in connection with the tax hypothesis.展开更多
Bazin favored every means to increase the "reality coefficient" in cinema. He specially prized cinema showing events integrally, what means, on the one hand, to show simultaneously and fully all the characters and a...Bazin favored every means to increase the "reality coefficient" in cinema. He specially prized cinema showing events integrally, what means, on the one hand, to show simultaneously and fully all the characters and all the objects pertaining to an event, and on the other to show the event integrally as it develops in time. Additionally Bazin showed that such a procedure reduces the purely literary component in cinema, and, correspondingly, increases its illusory force--as to the fictional reality presented. Yet, Bazin's work is not systematic, giving us brilliant insights scattered through many essays. Following Bazin's main idea, this presentation attempts to systematically discuss the illusory potential of the shot presenting an event integrally as compared with the imaginary, that is, literary character introduced in cinema by suggesting an event by means of montage and fragmentary shots. We proceed by means of a detailed consideration of the belief-structure of the aesthetic experience corresponding to the single shot integrally showing an event and to montage suggesting an event by means of fragmentary shots. The core of the presentation lies in defining the concept of aesthetic belief as the propositional attitude having the structure accepting that P without believing that P is the case. We will carefully distinguish that structure in the case of illusion from the case of imagination as well as from illusion as sensory-based deception.展开更多
Religious affection is a kind of emotional experience that religious believers have to the gods after they have participated in religious activities and experienced religious rituals. Religious experience is what conn...Religious affection is a kind of emotional experience that religious believers have to the gods after they have participated in religious activities and experienced religious rituals. Religious experience is what connects individuals and the gods. It can lead people to believe in religion and strengthen people's religious beliefs and is the basis of the establishment, dissemination and consolidation of religions. This article reveals that extreme cults create illusions for believers by conducting information and time control, making them exhausted physically and mentally and using "social hypnosis" and that they have stolen traditional religious affection and religious experience for their own usage by inducing believers religious affection through self-praise, intimidation and deception and wide insinuation.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos.52211540005 and 52076087)the Natural Science Foundation of Hubei Province of China (Grant No.2023AFA072)+2 种基金the Open Project Program of Wuhan National Laboratory for Optoelectronics (Grant No.2021WNLOKF004)the Wuhan Knowledge Innovation Shuguang Programthe Science and Technology Program of Hubei Province of China (Grant No.2021BLB176)。
文摘Thermal illusion aims to create fake thermal signals or hide the thermal target from the background thermal field to mislead infrared observers,and illusion thermotics was proposed to regulate heat flux with artificially structured metamaterials for thermal illusion.Most theoretical and experimental works on illusion thermotics focus on two-dimensional materials,while heat transfer in real three-dimensional(3D)objects remains elusive,so the general 3D illusion thermotics is urgently demanded.In this study,we propose a general method to design 3D thermal illusion metamaterials with varying illusions at different sizes and positions.To validate the generality of the 3D method for thermal illusion metamaterials,we realize thermal functionalities of thermal shifting,splitting,trapping,amplifying and compressing.In addition,we propose a special way to simplify the design method under the condition that the size of illusion target is equal to the size of original heat source.The 3D thermal illusion metamaterial paves a general way for illusion thermotics and triggers the exploration of illusion metamaterials for more functionalities and applications.
文摘Background: The neural representation of the body is easily altered by integrating multiple sensory signals in the brain. The “Rubber Hand Illusion” (RHI) is one of the most popular experimental paradigms to investigate this phenomenon. During this illusion, ownership of a rubber hand is temporarily induced. It was shown that external and continuous cooling of the palm enhanced the RHI, suggesting an association between altered the autonomic nervous system regulation and altered the sense of ownership of a specific limb. Purpose: To investigate whether artificially cooling the entire hand for a short period affects the magnitude of the illusion. Methods: Participants immersed their entire hand in cool, cold, or warm water for 1 min before the RHI procedure. Results: We found that cooling the entire hand enhanced the proprioceptive drift during the RHI but not the subjective feeling of ownership. In contrast, warming and intense cooling of the entire hand did not affect the RHI strength. Conclusion: Our results suggest that transient and moderate cooling of the entire hand was sufficient in enhancing the illusory disembodiment of one’s own hand.
基金the National Natural Science Foundation of China(Grant Nos.12174240,11674206,and 11874253)the Natural Science Basic Research Plan in the Shaanxi Province of China(Grant No.2023-JC-QN-0049).
文摘Source illusion is an important issue in acoustic fields that has significant applications in various practical scenarios.Recent progress in acoustic metasurfaces has broken the limitation of manipulating large-scale waves at subwavelength scales and enables a better illusion capability,while there is still a problem that most previous studies are hampered by a lack of tuning capability.Here we propose a reconfigurable source illusion device capable of providing azimuthallydependent phase delay in real-time via changing the static voltage distribution.The resulting device is implemented by employing an adjustable piezoelectric metasurface with a subwavelength thickness that can achieve a full 2π-phase shift while maintaining efficient transmittance.The effectiveness of our mechanism is demonstrated via two distinctive source illusion phenomena of shifting and transforming a simple point source without changing the device geometry.We anticipate that our methodology,which does not require a large device size or a complicated phased array,will open up new avenues for the miniaturization and integration of source illusion devices and may promote their on-chip applications in a variety of fields,such as acoustic camouflage and manipulation precision.
基金supported by the Researchers Supporting Project Number(RSP2023R34)King Saud University,Riyadh,Saudi Arabia。
文摘Recent advancements in the Vehicular Ad-hoc Network(VANET)have tremendously addressed road-related challenges.Specifically,Named Data Networking(NDN)in VANET has emerged as a vital technology due to its outstanding features.However,the NDN communication framework fails to address two important issues.The current NDN employs a pull-based content retrieval network,which is inefficient in disseminating crucial content in Vehicular Named Data Networking(VNDN).Additionally,VNDN is vulnerable to illusion attackers due to the administrative-less network of autonomous vehicles.Although various solutions have been proposed for detecting vehicles’behavior,they inadequately addressed the challenges specific to VNDN.To deal with these two issues,we propose a novel push-based crucial content dissemination scheme that extends the scope of VNDN from pullbased content retrieval to a push-based content forwarding mechanism.In addition,we exploitMachine Learning(ML)techniques within VNDN to detect the behavior of vehicles and classify them as attackers or legitimate.We trained and tested our system on the publicly accessible dataset Vehicular Reference Misbehavior(VeReMi).We employed fiveML classification algorithms and constructed the bestmodel for illusion attack detection.Our results indicate that RandomForest(RF)achieved excellent accuracy in detecting all illusion attack types in VeReMi,with an accuracy rate of 100%for type 1 and type 2,96%for type 4 and type 16,and 95%for type 8.Thus,RF can effectively evaluate the behavior of vehicles and identify attacker vehicles with high accuracy.The ultimate goal of our research is to improve content exchange and secureVNDNfromattackers.Thus,ourML-based attack detection and preventionmechanismensures trustworthy content dissemination and prevents attacker vehicles from sharing misleading information in VNDN.
基金Supported by the Soft Science Project of the Science and Technology Agency of Jiangxi Province(20133BBA10017)the Planning Project for Arts and Social Sciences of Jiangxi Province~~
文摘In modern Chinese style garden, the designer could express the emotions in garden creation to produce artistic conception with landscape plants, which could make the sightseers desire to integrate with the nature and led to sympathizing with the concept, thereby motivating and arousing people's emotion to return to and close to nature. Through the 6 specific characteristics of "shape, color, aroma, shadow, sound and art" of landscape plants, some ways to build artistic conception in Chinese style garden were introduced in this study to provide references for the creation of artistic conception creation through senses in the future landscaping design.
文摘There are a great many escapists in modern American drama, who indulge in their past or escape into the fort of dream. Great change of society, as well as traditional values, gives an impact on the escapists. They feel mixed-up and perplexed about their lives and future. The conflicts among pursuit and disillusionment, past and present, tradition and modernity, material and spirit, ideal and reality make the escapists choose to build a wall to separate them from the real world. They become the souls drifting in the reality, without knowing their status in society or the meaning of life.
文摘Objective The Müller-Lycr illusion is a visual illusion in which a horizontal shaft with an inward-pointing chevron (fins-out) affixed to each end is perceived longer than a shaft with outward-pointing chevrons (fins-in). The goal of this study was to compare the effects of experience and knowledge about the Müller-Lyer illusion on participants' perceptual precision. Method Participants were undergraduate students (n = 108) who were not familiar with the Müller-Lyer illusion prior to the experiment. The task of participants was to adjust one movable line to make it equal to the other in Müller-Lyer figure. They received ascending and descending Müller-Lyer trials in three blocks with 20 trials each. The Experimental Group received information about the Müller-Lyer illusion prior to the third block. Results For the Experimental Group, the amount of departure in Block 3 was reduced significantly compared with previous blocks. Conclusion Knowledge about the mechanisms underlying visual illusions may play an important role in helping individuals overcome them.
文摘In a one-dimension Mauldin-Williams Random Cantor Set Universe, the Sigalotti topological speed of light is where . It follows then that the corresponding topological acceleration must be a golden mean downscaling of c namely . Since the maximal height in the one-dimensional universe must be where is the unit interval length and note that the topological mass (m) and topological dimension (D) where m = D = 5 are that of the largest unit sphere volume, we can conclude that the potential energy of classical mechanics translates to . Remembering that the kinetic energy is , then by the same logic we see that when m = 5 is replaced by for reasons which are explained in the main body of the present work. Adding both expressions together, we find Einstein’s maximal energy . As a general conclusion, we note that within high energy cosmology, the sharp distinction between potential energy and kinetic energy of classical mechanics is blurred on the cosmic scale. Apart of being an original contribution, the article presents an almost complete bibliography on the Cantorian-fractal spacetime theory.
文摘In psychology, the concept of interpretation has been namely associated to the subjectivist paradigm underpinning qualitative approaches, rather than the objectivist paradigm charactefising quantitative research. In this article, we challenge this belief by showing how interpretation concerns psychology as a whole. To do this, the authors will first consider some dominant tendencies characterising the psychological field in general, such as the "empiricist illusion" and the "trap of scientism" (Vygotsky 1999). Moreover, they will introduce the cultural perspective in psychology, pertinent to deconstruct several assumptions regarding research within the discipline. Stemming from this approach, "indirect methods" will be presented with regard to their potential to analyse psychological phenomena both qualitatively and scientifically. They will conclude by describing a set of principles that can be implemented when doing qualitative research as to ensure the quality and the adequacy of interpretation.
文摘We will discuss here the tension between the reality of new media and narratological theory, and the case in point will be cinema. Our thesis is that new media have to do with illusion, basically with illusion, and only derivatively with imagination; on the contrary, the field of literature has to do with imagination, strictly with imagination, not with illusion at all. If it is so, something must be wrong with the pretence of narratology, which has literature as its basic referent, to be the adequate theoretical frame in order to understand every cultural phenomenon, especially in the case of new media. We have to insist on the distinction between illusion and imagination. In fact, most literary theorists do not bear in mind such distinction; it tends to completely disappear under the general title "fiction." To be sure, it is usually said of cinema that it is fiction, like literature, but cinema is much more than fiction, it is illusion, even if it is the illusion of a story.
基金Project supported by the National Natural Science Foundation of China(Grant No.11702069)the Fundamental Research Funds for the Central Universities,China(Grant No.HEUCFM180203)
文摘Since the concept of invisible cloak was proposed by Pendry and Leonhardt in 2006, many researchers have applied the theory of coordinate transformation to thermodynamics and overcome the complexity of inhomogeneous and anisotropic of material parameters. However, only two-dimensional(2 D) thermal illusion devices are researched recently. According to this situation, our study focuses on three-dimensional(3 D) thermal illusion devices including shrinker(or invisible cloak),concentrator, amplifier, reshaper, and rotator with arbitrary shape in a general way. In this paper, the corresponding material parameters of thermal illusion devices mentioned above are derived based on the theory of transformation thermodynamics and the simulated results agree well with the theoretical derivations. In addition, the conventional invisible cloak just controls the temperature gradient rather than the temperature value which is more concerned in physical applications. Here,we find that the temperature value of the cloaked object can be controlled by adjusting the location of the original point of the coordinate system.
基金Project supported by the Natural Science Doctoral Research Start-Up Fund of Yunnan Normal University,China(Grant No.01000205020503130)the Key Project of Applied Basic Research Program of Yunnan Province,China(Grant No.2018FA033)。
文摘Reusable reciprocal invisibility and phantom device is proposed and designed based on multi-folded transformation optics and equivalent components. In comparison with the reported reciprocal invisibility cloaks, the material parameters of the device presented here are homogeneous, and the hiding of the target object does not require any “anti-object” at all,which dramatically breaks through the limitations of the “anti-object” design in previous reciprocal cloak design. Perfectly illusion effect is also found by reasonably setting the material parameters of the restored medium of the device, which can be used to confuse detection radars while hiding target objects. Last but not least, the proposed device has an open structure,which enables the target object enclosed by the device to perform material exchange and simplex transfer of information with the outside world through open channels. In other words, the proposed device has a reusable function, enabling stealth or phantom of new target objects without changing any parameters of the device.
基金supported by the National Natural Science Foundation of China(Grant No.11504426)the National Defense Foundation of China(Grant No.1010502020202)
文摘On the basis of transformation thermodynamics and compensation medium theory, we develop a method to design a two-dimensional thermal illusion device with arbitrary shape, and the general expression of thermal conductivity in the each region is obtained. Simulation results show that when an object is covered with the thermal illusion device, it will accurately perform the same temperature distribution signature as another object we have predetermined. Owing to the property of deceiving and interfering with the observer, the thermal illusion device can achieve generalized thermal stealth by using thermal metamaterials, which may have a potential application in military field.
文摘While the literature on inflation and stock prices is plentiful,there is little literature on deflation and stock prices.This paper explores the empirical data and makes a theoretical analysis of the likely impact on stock prices when expectations change from inflation to deflation.Deflation has a bad name among some economists and most investors.However,from a stock market perspective,deflations’bad name may not be well-deserved.Several observations support this:1)The 1930s was a statistical outlier and not representative for a deflationary period and deflation does not seem to create recessions,causality goes the other way;2)real stock returns are positive and around average in the periods leading up to and following the onset of deflation;3)when moving from low inflation to mild deflation,P/E ratios are virtually unchanged;and 4)peak P/E ratios seem to be reached at inflation rates close to zero.The author proposes three possible explanations for the seemingly disconnect between the empirical data and the“default”ex ante belief of most economists and investors:availability heurist,deflation illusion,and tax related issues in connection with the tax hypothesis.
文摘Bazin favored every means to increase the "reality coefficient" in cinema. He specially prized cinema showing events integrally, what means, on the one hand, to show simultaneously and fully all the characters and all the objects pertaining to an event, and on the other to show the event integrally as it develops in time. Additionally Bazin showed that such a procedure reduces the purely literary component in cinema, and, correspondingly, increases its illusory force--as to the fictional reality presented. Yet, Bazin's work is not systematic, giving us brilliant insights scattered through many essays. Following Bazin's main idea, this presentation attempts to systematically discuss the illusory potential of the shot presenting an event integrally as compared with the imaginary, that is, literary character introduced in cinema by suggesting an event by means of montage and fragmentary shots. We proceed by means of a detailed consideration of the belief-structure of the aesthetic experience corresponding to the single shot integrally showing an event and to montage suggesting an event by means of fragmentary shots. The core of the presentation lies in defining the concept of aesthetic belief as the propositional attitude having the structure accepting that P without believing that P is the case. We will carefully distinguish that structure in the case of illusion from the case of imagination as well as from illusion as sensory-based deception.
文摘Religious affection is a kind of emotional experience that religious believers have to the gods after they have participated in religious activities and experienced religious rituals. Religious experience is what connects individuals and the gods. It can lead people to believe in religion and strengthen people's religious beliefs and is the basis of the establishment, dissemination and consolidation of religions. This article reveals that extreme cults create illusions for believers by conducting information and time control, making them exhausted physically and mentally and using "social hypnosis" and that they have stolen traditional religious affection and religious experience for their own usage by inducing believers religious affection through self-praise, intimidation and deception and wide insinuation.