A data gathering system is designed for the interferometric fiber optic gyroscope (IFOG) of land strapdown inertial system. IFOG is tested and the testing curve is given. The test data of IFOG are analyzed with Allan ...A data gathering system is designed for the interferometric fiber optic gyroscope (IFOG) of land strapdown inertial system. IFOG is tested and the testing curve is given. The test data of IFOG are analyzed with Allan variance method and each error coefficient is identified. Furthermore, a random drift error model for IFOG is built by the method of time series analysis. The conclusion provides supports for improving IFOG design and compensating for errors of IFOG in practice.展开更多
A two-way satellite time and frequency transfer(TWSTFT) device equipped in the BeiDou navigation satellite system(BDS)can calculate clock error between satellite and ground master clock. TWSTFT is a real-time method w...A two-way satellite time and frequency transfer(TWSTFT) device equipped in the BeiDou navigation satellite system(BDS)can calculate clock error between satellite and ground master clock. TWSTFT is a real-time method with high accuracy because most system errors such as orbital error, station position error, and tropospheric and ionospheric delay error can be eliminated by calculating the two-way pseudorange difference. Another method, the multi-satellite precision orbit determination(MPOD)method, can be applied to estimate satellite clock errors. By comparison with MPOD clock estimations, this paper discusses the applications of the BDS TWSTFT clock observations in satellite clock measurement, satellite clock prediction, navigation system time monitor, and satellite clock performance assessment in orbit. The results show that with TWSTFT clock observations, the accuracy of satellite clock prediction is higher than MPOD. Five continuous weeks of comparisons with three international GNSS Service(IGS) analysis centers(ACs) show that the reference time difference between BeiDou time(BDT) and golbal positoning system(GPS) time(GPST) realized IGS ACs is in the tens of nanoseconds. Applying the TWSTFT clock error observations may obtain more accurate satellite clock performance evaluation in the 104 s interval because the accuracy of the MPOD clock estimation is not sufficiently high. By comparing the BDS and GPS satellite clock performance, we found that the BDS clock stability at the 103 s interval is approximately 10.12, which is similar to the GPS IIR.展开更多
Discuss and develop some contents which are relevant to the IEEE Std 647TM-2006 in this paper. The IEEE Std only involves Allan variance, and decomposes it into five primary noise terms, in which, however, the noise n...Discuss and develop some contents which are relevant to the IEEE Std 647TM-2006 in this paper. The IEEE Std only involves Allan variance, and decomposes it into five primary noise terms, in which, however, the noise nature of the so called "rate random walk noise" and the "rate ramp" is doubted by the IEEE Std editors. Here we use a mathematical identity to entirely affirm the first query and partially the second query as mentioned above. Besides, we argue that only the classical variance can be used in navigation, not the Allan variance. In order to seek the true nature of all drift terms in the variance, we adopt our original work that represents the noises as damped oscillations, to obtain the power spectral density (PSD) of the noises which is then transformed back into time domain. When the damped time constant is much longer than the sampling interval, the re-sulting slow variation term may be expanded into three terms: ordinary bias instability, rate random walk, and rate ramp. Therefore, these "noise terms" are not independent, and they are more of deterministic errors than random noises, and can be explained quantitatively. The resulting fast variation drift may be expanded into two terms. The first term is the same as angle random noise, while the second term adds to the true quantization noise term to form a new combined term called "quantiza-tion noise term". As the result of our research, not only the IEEE Std editors’ suspicions above are answered completely, but a new theory to analyze the laser gyro drifts is also presented, with several supporting examples to explain and verify the theory.展开更多
This paper proposes an automatic algorithm to determine the properties of stochastic processes and their parameters for inertial error. The proposed approach is based on a recently developed method called the generali...This paper proposes an automatic algorithm to determine the properties of stochastic processes and their parameters for inertial error. The proposed approach is based on a recently developed method called the generalized method of wavelet moments (GMWM), whose estimator was proven to be consistent and asymptotically normally distributed. This algorithm is suitable mainly (but not only) for the combination of several stochastic processes, where the model identification and parameter estimation are quite difficult for the traditional methods, such as the Allan variance and the power spectral density analysis. This algorithm further explores the complete stochastic error models and the candidate model ranking criterion to realize automatic model identification and determination. The best model is selected by making the trade-off between the model accuracy and the model complexity. The validation of this approach is verified by practical examples of model selection for MEMS-IMUs (micro-electro-mechanical system inertial measurement units) in varying dynamic conditions.展开更多
Optically levitated oscillators in high vacuum have excellent environmental isolation and low mass compared with conventional solid-state sensors,which makes them suitable for ultrasensitive force detection.The force ...Optically levitated oscillators in high vacuum have excellent environmental isolation and low mass compared with conventional solid-state sensors,which makes them suitable for ultrasensitive force detection.The force resolution usually scales with the measurement bandwidth,which represents the ultimate detection capability of the system under ideal conditions if sufficient time is provided for measurement.However,considering the stability of a real system,a method based on the Allan variance is more reliable to evaluate the actual force detection performance.In this study,a levitated optomechanical system with a force detection sensitivity of 6.33±1.62 zN/Hz^(1/2)was demonstrated.And for the first time,the Allan variance was introduced to evaluate the system stability due to the force sensitivity fluctuations.The force detection resolution of 166.40±55.48 yN was reached at the optimal measurement time of 2751 s.The system demonstrated in this work has the best force detection performance in both sensitivity and resolution that have been reported so far for optically levitated particles.The reported high-sensitivity force detection system is an excellent candidate for the exploration of new physics such as fifth force searching,high-frequency gravitational waves detection,dark matter research and so on.展开更多
An identification method using Allan variance and equivalent theorem is proposed to identify non-stationary sensor errors mixed out of different simple noises. This method firstly derives the discrete Allan variances ...An identification method using Allan variance and equivalent theorem is proposed to identify non-stationary sensor errors mixed out of different simple noises. This method firstly derives the discrete Allan variances of all component noises inherent in noise sources in terms of their different equations; then the variances are used to estimate the parameters of all component noise models; finally, the original errors are represented by the sum of the non-stationary component noise model and the equivalent m...展开更多
Edgar Allan Poe occupies a unique position in the history of American literature.His gothic horror novels prove astounding on account of extraordinary rendering the atmosphere and in-depth psychological description.In...Edgar Allan Poe occupies a unique position in the history of American literature.His gothic horror novels prove astounding on account of extraordinary rendering the atmosphere and in-depth psychological description.In his gothic novels,pestilence,tuberculosis and madness are common and the protagonists always suffer from foregoing diseases.Based on the investigation of the relation between Poe’s life and illness and the social and cultural background of Poe’s time,the thesis aims to discuss the emergence and embodiment of illness narratives in Poe’s tales in order to explore the aesthetic values and cultural connotations.展开更多
Intertextuality theory is one of extremely important critical methods in a host of western literary theories and provides a new perspective for numerous research scholars and common readers to comprehend and elaborate...Intertextuality theory is one of extremely important critical methods in a host of western literary theories and provides a new perspective for numerous research scholars and common readers to comprehend and elaborate literature and literary works.This thesis uses multiple and comprehensive ways mainly based on the theory of intertextuality.Theory of symbolism and the method of close reading are also used to explored the internal connection of two short stories:The Tell-Tale Heart and The Yellow Wallpaper.The author attempts to build blocks to application practice of the intertextuality theory in specific works,and elaborate the value and significance of intertextuality comprehension from two aspects including literary reading and literary inheritance.展开更多
We present a laser frequency locking system based on acousto-optic modulation transfer spectroscopy（AOMTS）. Theoretical and experimental investigations are carried out to optimize the locking performance mainly from...We present a laser frequency locking system based on acousto-optic modulation transfer spectroscopy（AOMTS）. Theoretical and experimental investigations are carried out to optimize the locking performance mainly from the view of the modulation frequency and index for the specific scheme of AOMTS. An FWHM linewidth of 63 kHz is achieved and the frequency stability in terms of Allan standard deviation reaches1.4 × 10^（-12） at 30 s. The frequency shifting capacity is validated throughout the acousto-optic modulator bandwidth while the laser is kept locked. This work offers a different but efficient choice for applications calling for both stabilized and tunable laser frequencies.展开更多
Defamiliarization,the core theory of Russian formalism,emphasizes specific effects in a literary work by adopting fresh perspective to change readers' automatic and practical perception to an unfamiliar one.Edgar ...Defamiliarization,the core theory of Russian formalism,emphasizes specific effects in a literary work by adopting fresh perspective to change readers' automatic and practical perception to an unfamiliar one.Edgar allan poe is one of the writers who applied defamiliarization in his writing The Black Cat to help improve the literariness of a literature,break the set pattern and attract readers attention on modern people's twisted personality and dark inner world.展开更多
In the microwave 199Hg＋ trapped-ion clock, the frequency instability degradation caused by the Dick effect is un- avoidable because of the periodical interrogating field. In this paper, the general expression of the ...In the microwave 199Hg＋ trapped-ion clock, the frequency instability degradation caused by the Dick effect is un- avoidable because of the periodical interrogating field. In this paper, the general expression of the sensitivity function g（t） to the frequency fluctuation of the interrogating field with Nπ-pulse （N is odd） is derived. According to the measured phase noise of the 40.5-GHz microwave synthesizer, the Dick-effect limited Allan deviation of our 199Hg＋ trapped-ion clock is worked out. The results indicate that the limited Allan deviations are about 1.75 ×10-13/√τ and 3.03 ×10-13/√τ respectively in the linear ion trap and in the two-segment extended linear ion trap under our present experimental parameters.展开更多
用 Allan 方差法对激光陀螺漂移数据的各种误差源及其整个噪声统计特性进行细致的表征和辨识。根据有效信号与各种噪声信号的频谱差异,用 Mallat 算法对 RLG 漂移信号进行塔式分解,采用软阈值消噪法去除噪声。对小波去噪前后的激光陀螺...用 Allan 方差法对激光陀螺漂移数据的各种误差源及其整个噪声统计特性进行细致的表征和辨识。根据有效信号与各种噪声信号的频谱差异,用 Mallat 算法对 RLG 漂移信号进行塔式分解,采用软阈值消噪法去除噪声。对小波去噪前后的激光陀螺零漂信号用 Allan 方差进行对比分析表明,小波变换有效的减小了激光陀螺零漂信号中的角度随机游走、角速度随机游走、速率斜坡和量化嗓声,提高了激光陀螺零偏输出的稳定性。展开更多
A CO2 sensor for capnography, based on a hollow waveguide(HWG) and tunable diode laser absorption spectroscopy(TDLAS), is presented; the sensor uses direct absorption spectroscopy and requires neither frequent calibra...A CO2 sensor for capnography, based on a hollow waveguide(HWG) and tunable diode laser absorption spectroscopy(TDLAS), is presented; the sensor uses direct absorption spectroscopy and requires neither frequent calibration nor optical filters, giving it a significant advantage over existing techniques. Because of the HWG, the CO2 measurement achieved a concentration resolution of 60 ppm at a measurement rate of 25 Hz, as characterized by Allan variance. The length of the HWG was selected to efficiently suppress the optical fringes. This setup is perfectly suited for the detection of CO2 by capnography, and shows promise for the potential detection of other breath gases.展开更多
Edgar Allan Poe is one of the most unique writers in America.It was until 20th century that the importance of Poe's literary creations had been recognized extensively by the academic world.Many of his works have b...Edgar Allan Poe is one of the most unique writers in America.It was until 20th century that the importance of Poe's literary creations had been recognized extensively by the academic world.Many of his works have been analyzed as the psychological materials.His short stories "The Black Cat" is one of the most classic horror novels which also has been criticized from the dark side of human being in psychology,however,this essay aims to analysis "The Black Cat" in the perspective of myth-archetype criticism which can lift up readers' mind on a broader perspective.Also,the ancient Greek mythology and Christian thought which will help us to understand his other works easily and make us know more about his particular contribution to the world literary history.展开更多
Despite of only producing five ratiocinative tales in the whole life,Edgar Allan Poe is acknowledged as the "father of the detective story".In those tales,Poe portrays the hero Dupin who is the first detecti...Despite of only producing five ratiocinative tales in the whole life,Edgar Allan Poe is acknowledged as the "father of the detective story".In those tales,Poe portrays the hero Dupin who is the first detective image in the history of the western literature vividly.Based on the stories in which Dupin appeared,concerns on the creation of Dupin,the analysis of his features and the function of the setting fellows,like friend and police,summarizing the traditional image pattern of detective stories created by Poe,revealing the great influence Poe had on the development of detective literature,even on the literature of the whole world.展开更多
Edgar Allan Poe,a writer of a Romanism,is well-known for his grotesque and grim style of writing.In most of his grotesque and grim works,describing females is his major method to express his own emotion.All of these w...Edgar Allan Poe,a writer of a Romanism,is well-known for his grotesque and grim style of writing.In most of his grotesque and grim works,describing females is his major method to express his own emotion.All of these women usually have a perfect appearance and passionate character,but are afflicted with mysterious illness.It is a conventional means of voicing feeling for Allan Poe to describe the heroes' deep pain and their yearning for the beautiful heroines.This thesis will introduce Allan Poe's legendary life and analyze the features of the females in his life and works under the background of the United States at Edgar Allan Poe's times.And this thesis will describe of his denial of the patriarchy.展开更多
文摘A data gathering system is designed for the interferometric fiber optic gyroscope (IFOG) of land strapdown inertial system. IFOG is tested and the testing curve is given. The test data of IFOG are analyzed with Allan variance method and each error coefficient is identified. Furthermore, a random drift error model for IFOG is built by the method of time series analysis. The conclusion provides supports for improving IFOG design and compensating for errors of IFOG in practice.
基金supported by the National Natural Sciences Foundation of China(Grant No.41574029)Youth Innovation Promotion Association CAS(Grant No.2016242)
文摘A two-way satellite time and frequency transfer(TWSTFT) device equipped in the BeiDou navigation satellite system(BDS)can calculate clock error between satellite and ground master clock. TWSTFT is a real-time method with high accuracy because most system errors such as orbital error, station position error, and tropospheric and ionospheric delay error can be eliminated by calculating the two-way pseudorange difference. Another method, the multi-satellite precision orbit determination(MPOD)method, can be applied to estimate satellite clock errors. By comparison with MPOD clock estimations, this paper discusses the applications of the BDS TWSTFT clock observations in satellite clock measurement, satellite clock prediction, navigation system time monitor, and satellite clock performance assessment in orbit. The results show that with TWSTFT clock observations, the accuracy of satellite clock prediction is higher than MPOD. Five continuous weeks of comparisons with three international GNSS Service(IGS) analysis centers(ACs) show that the reference time difference between BeiDou time(BDT) and golbal positoning system(GPS) time(GPST) realized IGS ACs is in the tens of nanoseconds. Applying the TWSTFT clock error observations may obtain more accurate satellite clock performance evaluation in the 104 s interval because the accuracy of the MPOD clock estimation is not sufficiently high. By comparing the BDS and GPS satellite clock performance, we found that the BDS clock stability at the 103 s interval is approximately 10.12, which is similar to the GPS IIR.
基金supported by the "Tenth five" Obligatory Budget of PLA (Grant No.9140A09010807KG0191)
文摘Discuss and develop some contents which are relevant to the IEEE Std 647TM-2006 in this paper. The IEEE Std only involves Allan variance, and decomposes it into five primary noise terms, in which, however, the noise nature of the so called "rate random walk noise" and the "rate ramp" is doubted by the IEEE Std editors. Here we use a mathematical identity to entirely affirm the first query and partially the second query as mentioned above. Besides, we argue that only the classical variance can be used in navigation, not the Allan variance. In order to seek the true nature of all drift terms in the variance, we adopt our original work that represents the noises as damped oscillations, to obtain the power spectral density (PSD) of the noises which is then transformed back into time domain. When the damped time constant is much longer than the sampling interval, the re-sulting slow variation term may be expanded into three terms: ordinary bias instability, rate random walk, and rate ramp. Therefore, these "noise terms" are not independent, and they are more of deterministic errors than random noises, and can be explained quantitatively. The resulting fast variation drift may be expanded into two terms. The first term is the same as angle random noise, while the second term adds to the true quantization noise term to form a new combined term called "quantiza-tion noise term". As the result of our research, not only the IEEE Std editors’ suspicions above are answered completely, but a new theory to analyze the laser gyro drifts is also presented, with several supporting examples to explain and verify the theory.
基金supported by the National Science Foundation of China(Nos.42274037,41874034)the Beijing Natural Science Foundation(No.4202041)the National Key Research and Development Program of China(No.2020YFB0505804).
文摘This paper proposes an automatic algorithm to determine the properties of stochastic processes and their parameters for inertial error. The proposed approach is based on a recently developed method called the generalized method of wavelet moments (GMWM), whose estimator was proven to be consistent and asymptotically normally distributed. This algorithm is suitable mainly (but not only) for the combination of several stochastic processes, where the model identification and parameter estimation are quite difficult for the traditional methods, such as the Allan variance and the power spectral density analysis. This algorithm further explores the complete stochastic error models and the candidate model ranking criterion to realize automatic model identification and determination. The best model is selected by making the trade-off between the model accuracy and the model complexity. The validation of this approach is verified by practical examples of model selection for MEMS-IMUs (micro-electro-mechanical system inertial measurement units) in varying dynamic conditions.
基金supported by grants from the National Natural Science Foundation of China(62005248,62075193)Major Project of Natural Science Foundation of Zhejiang Province(LD22F050002)+2 种基金Major Scientific Research Project of Zhejiang Lab(2019MB0AD01,2021MB0AL02,2022MB0AL02)the Fundamental Research Funds for the Central Universities,China(2016XZZX00401 and 2018FZA5002)the National Program for Special Support of Top-Notch Young Professionals(W02070390),China.
文摘Optically levitated oscillators in high vacuum have excellent environmental isolation and low mass compared with conventional solid-state sensors,which makes them suitable for ultrasensitive force detection.The force resolution usually scales with the measurement bandwidth,which represents the ultimate detection capability of the system under ideal conditions if sufficient time is provided for measurement.However,considering the stability of a real system,a method based on the Allan variance is more reliable to evaluate the actual force detection performance.In this study,a levitated optomechanical system with a force detection sensitivity of 6.33±1.62 zN/Hz^(1/2)was demonstrated.And for the first time,the Allan variance was introduced to evaluate the system stability due to the force sensitivity fluctuations.The force detection resolution of 166.40±55.48 yN was reached at the optimal measurement time of 2751 s.The system demonstrated in this work has the best force detection performance in both sensitivity and resolution that have been reported so far for optically levitated particles.The reported high-sensitivity force detection system is an excellent candidate for the exploration of new physics such as fifth force searching,high-frequency gravitational waves detection,dark matter research and so on.
基金National Basic Research Program of China (JW132006093)
文摘An identification method using Allan variance and equivalent theorem is proposed to identify non-stationary sensor errors mixed out of different simple noises. This method firstly derives the discrete Allan variances of all component noises inherent in noise sources in terms of their different equations; then the variances are used to estimate the parameters of all component noise models; finally, the original errors are represented by the sum of the non-stationary component noise model and the equivalent m...
文摘Edgar Allan Poe occupies a unique position in the history of American literature.His gothic horror novels prove astounding on account of extraordinary rendering the atmosphere and in-depth psychological description.In his gothic novels,pestilence,tuberculosis and madness are common and the protagonists always suffer from foregoing diseases.Based on the investigation of the relation between Poe’s life and illness and the social and cultural background of Poe’s time,the thesis aims to discuss the emergence and embodiment of illness narratives in Poe’s tales in order to explore the aesthetic values and cultural connotations.
基金This paper is sponsored by the Postgraduate Creative Foundation of Gannan Normal University entitled“A Comparative Study on Intertextuality of The Tell-Tale Heart and The Yellow Wallpaper”(《泄密的心》与《黄色墙纸》的互文性研究)(YCX21A004 and“National Social Science Foundation of China western Project in 2018”(“2018年国家社科基金西部项目”)entitled“A study of Chinese Ci fu in the English-speaking world”“英语世界的中国辞赋研究”(18XZW017).
文摘Intertextuality theory is one of extremely important critical methods in a host of western literary theories and provides a new perspective for numerous research scholars and common readers to comprehend and elaborate literature and literary works.This thesis uses multiple and comprehensive ways mainly based on the theory of intertextuality.Theory of symbolism and the method of close reading are also used to explored the internal connection of two short stories:The Tell-Tale Heart and The Yellow Wallpaper.The author attempts to build blocks to application practice of the intertextuality theory in specific works,and elaborate the value and significance of intertextuality comprehension from two aspects including literary reading and literary inheritance.
基金supported by the National Natural Science Foundation(No.51275523)the Specialized Research Fund for the Doctoral Program of Higher Education(No.20134307110009)of China
文摘We present a laser frequency locking system based on acousto-optic modulation transfer spectroscopy（AOMTS）. Theoretical and experimental investigations are carried out to optimize the locking performance mainly from the view of the modulation frequency and index for the specific scheme of AOMTS. An FWHM linewidth of 63 kHz is achieved and the frequency stability in terms of Allan standard deviation reaches1.4 × 10^（-12） at 30 s. The frequency shifting capacity is validated throughout the acousto-optic modulator bandwidth while the laser is kept locked. This work offers a different but efficient choice for applications calling for both stabilized and tunable laser frequencies.
文摘Defamiliarization,the core theory of Russian formalism,emphasizes specific effects in a literary work by adopting fresh perspective to change readers' automatic and practical perception to an unfamiliar one.Edgar allan poe is one of the writers who applied defamiliarization in his writing The Black Cat to help improve the literariness of a literature,break the set pattern and attract readers attention on modern people's twisted personality and dark inner world.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11074248 and 11474320)
文摘In the microwave 199Hg＋ trapped-ion clock, the frequency instability degradation caused by the Dick effect is un- avoidable because of the periodical interrogating field. In this paper, the general expression of the sensitivity function g（t） to the frequency fluctuation of the interrogating field with Nπ-pulse （N is odd） is derived. According to the measured phase noise of the 40.5-GHz microwave synthesizer, the Dick-effect limited Allan deviation of our 199Hg＋ trapped-ion clock is worked out. The results indicate that the limited Allan deviations are about 1.75 ×10-13/√τ and 3.03 ×10-13/√τ respectively in the linear ion trap and in the two-segment extended linear ion trap under our present experimental parameters.
文摘用 Allan 方差法对激光陀螺漂移数据的各种误差源及其整个噪声统计特性进行细致的表征和辨识。根据有效信号与各种噪声信号的频谱差异,用 Mallat 算法对 RLG 漂移信号进行塔式分解,采用软阈值消噪法去除噪声。对小波去噪前后的激光陀螺零漂信号用 Allan 方差进行对比分析表明,小波变换有效的减小了激光陀螺零漂信号中的角度随机游走、角速度随机游走、速率斜坡和量化嗓声,提高了激光陀螺零偏输出的稳定性。
基金supported by the Special-funded Program on National Key Scientific Instruments and Equipment Development of China(No.2012YQ06016501)the Tianjin Natural Science Fund Project(No.11JCYBJC04900)
文摘A CO2 sensor for capnography, based on a hollow waveguide(HWG) and tunable diode laser absorption spectroscopy(TDLAS), is presented; the sensor uses direct absorption spectroscopy and requires neither frequent calibration nor optical filters, giving it a significant advantage over existing techniques. Because of the HWG, the CO2 measurement achieved a concentration resolution of 60 ppm at a measurement rate of 25 Hz, as characterized by Allan variance. The length of the HWG was selected to efficiently suppress the optical fringes. This setup is perfectly suited for the detection of CO2 by capnography, and shows promise for the potential detection of other breath gases.
文摘Edgar Allan Poe is one of the most unique writers in America.It was until 20th century that the importance of Poe's literary creations had been recognized extensively by the academic world.Many of his works have been analyzed as the psychological materials.His short stories "The Black Cat" is one of the most classic horror novels which also has been criticized from the dark side of human being in psychology,however,this essay aims to analysis "The Black Cat" in the perspective of myth-archetype criticism which can lift up readers' mind on a broader perspective.Also,the ancient Greek mythology and Christian thought which will help us to understand his other works easily and make us know more about his particular contribution to the world literary history.
文摘Despite of only producing five ratiocinative tales in the whole life,Edgar Allan Poe is acknowledged as the "father of the detective story".In those tales,Poe portrays the hero Dupin who is the first detective image in the history of the western literature vividly.Based on the stories in which Dupin appeared,concerns on the creation of Dupin,the analysis of his features and the function of the setting fellows,like friend and police,summarizing the traditional image pattern of detective stories created by Poe,revealing the great influence Poe had on the development of detective literature,even on the literature of the whole world.
文摘Edgar Allan Poe,a writer of a Romanism,is well-known for his grotesque and grim style of writing.In most of his grotesque and grim works,describing females is his major method to express his own emotion.All of these women usually have a perfect appearance and passionate character,but are afflicted with mysterious illness.It is a conventional means of voicing feeling for Allan Poe to describe the heroes' deep pain and their yearning for the beautiful heroines.This thesis will introduce Allan Poe's legendary life and analyze the features of the females in his life and works under the background of the United States at Edgar Allan Poe's times.And this thesis will describe of his denial of the patriarchy.
