We propose an electronic model in Spice, instead of traditional mathematical analysis, for analyzing the performance of ferroelectric liquid crystal （FLC） under various working conditions. Using this equivalent circ...We propose an electronic model in Spice, instead of traditional mathematical analysis, for analyzing the performance of ferroelectric liquid crystal （FLC） under various working conditions. Using this equivalent circuit model,it is easy to simulate and analyze the behavior of an FLC layer in three different typical parameters,including temperature, input light wavelength, and the frequency of driving voltage. We conclude that the response velocity drops as the wavelength increases in the range of visible light, and for the parameter of temperature, the velocity reaches its lowest value when the temperature reaches a certain degree,meanwhile,the frequency of driving voltage exerts important effects on the response velocity only when the frequency is beyond a critical value. Excellent agreement is achieved between simulation and experimental results.展开更多
Several reports have described an apparently uncommon clinicopathological disorder that is characterized by multifocal stenosing small-intestinal ulceration.Compared to Crohn's disease,the ulcers are not transmura...Several reports have described an apparently uncommon clinicopathological disorder that is characterized by multifocal stenosing small-intestinal ulceration.Compared to Crohn's disease,the ulcers are not transmural and typically remain shallow,and involve only the mucosa and submucosa.The disorder seems to be localized in the jejunum and proximal ileum only,and not the distal ileum or colon.Only nonspecif ic inflammatory changes are present without giant cells or other typical features of granulomatous inflammation.Most patients present clinically with recurrent obstructive events that usually respond to steroids,surgical resection,or both.With the development of newer imaging modalities to visualize the small-intestinal mucosa,such as double-balloon enteroscopy,improved understanding of the long-term natural history of this apparently distinctive disorder should emerge.展开更多
In order to investigate the behavior of buildings and engineering structures during earthquakes, based on the data of seismic observation devices mounted on constructions with typical characteristics, results of inves...In order to investigate the behavior of buildings and engineering structures during earthquakes, based on the data of seismic observation devices mounted on constructions with typical characteristics, results of investigating the change of mechanical properties of building structural system over time and the results of examination of structural rigidity and safety change over time, depending on the dynamic characteristics of the building, determined by experimental investigations made at intervals are mentioned in this article. In addition, evaluation of earthquake acceleration acting on structures due to earthquake-induced damage characteristics of buildings and engineering constructions which are made earthquake resistant is also included here.展开更多
The underground fluid short-term anomalies of earthquake activity are studied. Two kinds of typical characteristics of precursors, the turn-around type and the single type, are summarized. Through studying regional ch...The underground fluid short-term anomalies of earthquake activity are studied. Two kinds of typical characteristics of precursors, the turn-around type and the single type, are summarized. Through studying regional characteristics of earthquake precursors in North China (including Northwest China) and Southwest China, we find that the two types of precursors are strongly related to geological structures in regional distribution and they show varying characteristics with earthquake magnitude in number.展开更多
This study was based on self-report of a MOOC school-based college English classroom teaching practice flip. Firstly, it is based on the analysis of the typical characteristics of MOOC leveraging MOOC college English ...This study was based on self-report of a MOOC school-based college English classroom teaching practice flip. Firstly, it is based on the analysis of the typical characteristics of MOOC leveraging MOOC college English courses on the basis of the next report on the concrete practice of school-based college English MOOC construction and flipped classroom teaching. Quantitative and qualitative data on learner feedback in the survey analysis shows that based MOOC flip mode is suitable for classroom teaching college English teaching, MOOC and flipped classroom have been highly recognized by students, which gives full play to both collaborative IT and foreign language teaching the depth of integration of blended learning potential.展开更多
For solving the difficult problem of leakage detection in city gas pipelines, a method using acoustic technique based on instantaneous energy (IE) distribution and correlation analysis was proposed. Firstly, the basic...For solving the difficult problem of leakage detection in city gas pipelines, a method using acoustic technique based on instantaneous energy (IE) distribution and correlation analysis was proposed. Firstly, the basic theory of leakage detection and location was introduced. Then the physical relationship between instantaneous energy and structural state variation of a system was analyzed theoretically. With HILBERT-HUANG transformation (HHT), the instantaneous energy distribution feature of an unstable acoustic signal was obtained. According to the relative contribution method of the instantaneous energy, the noise in signal was eliminated effectively. Furthermore, in order to judge the leakage, the typical characteristic of the instantaneous energy of signal in the input and output end was discussed using correlative analysis. A number of experiments were carried out to classify the leakage from normal operations, and the results show that the leakages are successfully detected and the average recognition rate reaches 93.3% among three group samples. It is shown that the method using acoustic technique with IED and correlative analysis is effective and it may be referred in other pipelines.展开更多
Women entrepreneurs are increasingly representing an underexploited potential of the Swiss economy. Although entrepreneurship represents a rapidly expanding phenomenon, women meet specific difficulties that explain th...Women entrepreneurs are increasingly representing an underexploited potential of the Swiss economy. Although entrepreneurship represents a rapidly expanding phenomenon, women meet specific difficulties that explain this lack of exploitation by the economy, The Global Entrepreneurship Monitor （GEM）, a not-for-profit academic research consortium, published its annual report which mentioned in particular a difference between female and male entrepreneurship. According to these results, it can be noticed that the typical profile of the female entrepreneur differs from that of her male counterpart. In Switzerland, those differences can be situated at three levels： （I） In the first place, a natural difference of the female entrepreneurship at the level of activities （service activities, low-added value, and low potential of job creation）; （2） Secondly, a difference in motivation/commitment （part-time work, start-up funds available, skills, received opportunities, and fear of failure）; and （3） Thirdly, a difference at the level of insertion （revealing the importance of networking, access to financing and structures of encouragement）. The present communication points up a typical profile of the woman entrepreneur in Switzerland. The authors also intend to identify the kind of obstacles female entrepreneur is likely to meet as well as the existing initiatives to exceed stereotypes by taking into account her specificities. There are several supports and measures intended to help women entrepreneurship concerning the following aspects： better time management; adapted following and training structures; access to easier financing; and better visibility and networking.展开更多
文摘We propose an electronic model in Spice, instead of traditional mathematical analysis, for analyzing the performance of ferroelectric liquid crystal （FLC） under various working conditions. Using this equivalent circuit model,it is easy to simulate and analyze the behavior of an FLC layer in three different typical parameters,including temperature, input light wavelength, and the frequency of driving voltage. We conclude that the response velocity drops as the wavelength increases in the range of visible light, and for the parameter of temperature, the velocity reaches its lowest value when the temperature reaches a certain degree,meanwhile,the frequency of driving voltage exerts important effects on the response velocity only when the frequency is beyond a critical value. Excellent agreement is achieved between simulation and experimental results.
文摘Several reports have described an apparently uncommon clinicopathological disorder that is characterized by multifocal stenosing small-intestinal ulceration.Compared to Crohn's disease,the ulcers are not transmural and typically remain shallow,and involve only the mucosa and submucosa.The disorder seems to be localized in the jejunum and proximal ileum only,and not the distal ileum or colon.Only nonspecif ic inflammatory changes are present without giant cells or other typical features of granulomatous inflammation.Most patients present clinically with recurrent obstructive events that usually respond to steroids,surgical resection,or both.With the development of newer imaging modalities to visualize the small-intestinal mucosa,such as double-balloon enteroscopy,improved understanding of the long-term natural history of this apparently distinctive disorder should emerge.
文摘In order to investigate the behavior of buildings and engineering structures during earthquakes, based on the data of seismic observation devices mounted on constructions with typical characteristics, results of investigating the change of mechanical properties of building structural system over time and the results of examination of structural rigidity and safety change over time, depending on the dynamic characteristics of the building, determined by experimental investigations made at intervals are mentioned in this article. In addition, evaluation of earthquake acceleration acting on structures due to earthquake-induced damage characteristics of buildings and engineering constructions which are made earthquake resistant is also included here.
文摘The underground fluid short-term anomalies of earthquake activity are studied. Two kinds of typical characteristics of precursors, the turn-around type and the single type, are summarized. Through studying regional characteristics of earthquake precursors in North China (including Northwest China) and Southwest China, we find that the two types of precursors are strongly related to geological structures in regional distribution and they show varying characteristics with earthquake magnitude in number.
文摘This study was based on self-report of a MOOC school-based college English classroom teaching practice flip. Firstly, it is based on the analysis of the typical characteristics of MOOC leveraging MOOC college English courses on the basis of the next report on the concrete practice of school-based college English MOOC construction and flipped classroom teaching. Quantitative and qualitative data on learner feedback in the survey analysis shows that based MOOC flip mode is suitable for classroom teaching college English teaching, MOOC and flipped classroom have been highly recognized by students, which gives full play to both collaborative IT and foreign language teaching the depth of integration of blended learning potential.
基金Project(51004005) supported by the National Natural Science Foundation of ChinaProject supported by Open Research Fund Program of Beijing Engineering Research Center of Monitoring for Construction Safety (Beijing University of Civil Engineering and Architecture), China
文摘For solving the difficult problem of leakage detection in city gas pipelines, a method using acoustic technique based on instantaneous energy (IE) distribution and correlation analysis was proposed. Firstly, the basic theory of leakage detection and location was introduced. Then the physical relationship between instantaneous energy and structural state variation of a system was analyzed theoretically. With HILBERT-HUANG transformation (HHT), the instantaneous energy distribution feature of an unstable acoustic signal was obtained. According to the relative contribution method of the instantaneous energy, the noise in signal was eliminated effectively. Furthermore, in order to judge the leakage, the typical characteristic of the instantaneous energy of signal in the input and output end was discussed using correlative analysis. A number of experiments were carried out to classify the leakage from normal operations, and the results show that the leakages are successfully detected and the average recognition rate reaches 93.3% among three group samples. It is shown that the method using acoustic technique with IED and correlative analysis is effective and it may be referred in other pipelines.
文摘Women entrepreneurs are increasingly representing an underexploited potential of the Swiss economy. Although entrepreneurship represents a rapidly expanding phenomenon, women meet specific difficulties that explain this lack of exploitation by the economy, The Global Entrepreneurship Monitor （GEM）, a not-for-profit academic research consortium, published its annual report which mentioned in particular a difference between female and male entrepreneurship. According to these results, it can be noticed that the typical profile of the female entrepreneur differs from that of her male counterpart. In Switzerland, those differences can be situated at three levels： （I） In the first place, a natural difference of the female entrepreneurship at the level of activities （service activities, low-added value, and low potential of job creation）; （2） Secondly, a difference in motivation/commitment （part-time work, start-up funds available, skills, received opportunities, and fear of failure）; and （3） Thirdly, a difference at the level of insertion （revealing the importance of networking, access to financing and structures of encouragement）. The present communication points up a typical profile of the woman entrepreneur in Switzerland. The authors also intend to identify the kind of obstacles female entrepreneur is likely to meet as well as the existing initiatives to exceed stereotypes by taking into account her specificities. There are several supports and measures intended to help women entrepreneurship concerning the following aspects： better time management; adapted following and training structures; access to easier financing; and better visibility and networking.
