从“主演”到“导演”——浅析高效课堂中语文教师角色的根本性转变

在课程改革逐步深入的背景下,在大力提倡＂减负＂的今天,语文老师究竟要完成怎样的角色转变,才能真正消灭＂高耗低效＂的语文课堂,提高语文教学效率,这的确需要我们好好地思考。语文教师应该实现角色的转变,从＂主演＂转换到＂导演＂,真正实现课堂的高效。

AUTONOMOUS AGENT FRAMEWORK AND ITS DECISION-MAKING

Autonomy, a key property associated with the agent, is an important topic in the current research of the agent theory. Although no definition of the agent autonomy is universally accepted, an important aspect of the agent autonomy is the decision-making capability of the agents. This paper investigates the autonomy of the agent, presents a framework for autonomous agent and discusses its decision-making process. Started with introducing a language for representing autonomous agent, a framework is proposed for modeling autonomous agent based on a BDI model and the situation calculus. Finally, a kind of decision-making process of the autonomous agent is presented.

Experimental investigation on predicting precursory changes in entropy for dominant frequency of rockburst

Rockburst is a dynamic phenomenon accompanied by acoustic emission(AE)activities.It is difficult to predict rockburst accurately.Based on the fast Fourier transform(FFT)method and the information entropy theory,the evolution model of dominant frequency entropy was established.The AE energy,frequency and stress were synthetically considered to predict rockburst.Under the triaxial and the single-face unloading tests,the relationship between AE energy and the development of internal cracks was analyzed.Using the FFT method,the distribution characteristics of AE dominant frequency values were obtained.Based on the information entropy theory,the dominant frequencies evolved patterns were ascertained.It was observed that the evolution models of the dominant frequency entropy were nearly the same and shared a characteristic“undulation-decrease-rise-sharp decrease”pattern.Results show that AE energy will be released suddenly before rockburst.The density of intermediate frequency increased prior to rockburst.The dominant frequency entropy reached a relative maximum value before rockburst,and then decreased sharply.These features could be used as a precursory information for predicting rockburst.The proposed relative maximum value could be as a key point to predict rockburst.This is a meaningful attempt on predicting rockburst.

Effects of earthquake on damage evolution and failure mechanism of key rock pillars in underground engineering

Rock pillar is the key supporting component in underground engineering.During an earthquake,the key rock pillar must bear both the seismic load and the load transferred from other damaged pillars.This paper attempts to reveal the influence of the mainshock on damage evolution and failure characteristic of the key rock pillar during aftershocks by cyclic loading test of marble.Four levels of pre-damage stress(i.e.,10,30,50 and 70 MPa)in the first cycle were used to simulate the mainshock damage,and then cyclic stress with the same amplitude(namely 10 MPa)was conducted in the subsequent cycles to simulate the aftershock until rock failure.The results indicate that the presence of pre-damage has an obvious weakening effect on the bearing capacity and deformation resistance of rock materials during the aftershock process.Besides,the increase of pre-damage significantly changes the final failure pattern of the key rock pillar,and leads to an increase in the proportion of small-scale rock fragments.This study may contribute to understanding the seismic capacity of the unreinforced rock pillar during mainshock-aftershock seismic sequences and to optimizing the design of the key rock pillar in underground engineering.

A Comparative Analysis of＂The Little Mermaid＂ and ＂The Little Mer-persun＂ An SFG Approach

Informed by the framework of Halliday＇s Systemic Functional Grammar, this paper compares ＂The Little Mermaid＂ （1872） by Hans Christian Andersen and its parodic version ＂The Little Mer-persun＂ （1995） by James Finn Garner. Andersen＇s story creates gender stereotype by under-representing the heroine as an effectual Actor and Sayer but establishing the image of the hero as a powerful Actor and assertive Sayer. Garner＇s story, on the other hand, tends to subvert the traditional gender stereotype by representing the heroine as a more dynamic Actor and Sayer than the hero and by reversing the power relationship between the two. These differing characterizations reflect the two competing literary traditions and embedded ideologies of romanticist fairy tale genre and modem ＂politically-correct＂ parodic satire

The Babysitter： A Feminist Interpretation

Sexual violence, a prevalent problem in the spousal relationship, is closely related to the issue of female consciousness. In The Babysitter, Coover （1989） tells of a teenage girl babysitting two kids and a baby and of two of her male peers and the children＇s father altogether exploring their obsession towards her and, moreover, traces the evaluation and devaluation of women to the presentation of TV exploring its influence on his heroines, namely Mrs. Tucker and the babysitter serving as victims of the patriarchal society. Through a close engagement with the sexual objectification theory, this paper analyzes in detail men＇s aggressive oppressions upon women as well as women＇s compromise and rebellion towards the sexual violence, and investigates that the awakening of female independent consciousness is a key factor in effectively helping women achieve the gender equality between sexes.

Creative Thought and the First Performers of Tchaikovsky Opera ＂Evgeny Onegin＂

The opera is one of the music peaks of realism in the world opera literatures.It is full of sincere feelings and its characters have the real and vivid personality. Tchaikovsky choosing Pushkin＇ s ＂Onegin＂ as the opera theme is because he wants to get rid of the things of flashy without substance and he needs poetic, humanistic and simple subjects.

Inversion of Stress Fields in the Middle Section of the Xiaojiang Fault and Its Adjacent Area

With waveform data of 613 earthquakes with ML ≥ 2. 5 in the middle section of the Xiaojiang fault and its adjacent area which occurred during January,1998 to September 2007,focal mechanisms were calculated by the direct wave amplitude ratio of S /P in the vertical component and their characteristics were analyzed. According to regional tectonic features of the middle section of the Xiaojiang fault and its adjacent area,the study region was partitioned into two zones with the Xiaojiang fault as the boundary,e. g. zone A and zone B (including the Xiaojiang fault). In order to research the faults stress in detail,the Xiaojiang fault zone was picked out for independent analysis. The study region was also partitioned into 1°× 1° cells with a 0. 5° step. The stress fields of zone A,B and the fault zone were inverted with the FMSI method (Gephart,1990). The results show that first, the faults are mainly of strike-slip in the middle section and its adjacent area,amounting to 81. 28%,69. 23% and 72. 97% in the A,B and fault zones,respectively. Secondly,the stress inversion also indicates that the directions of maximum principal stress σ1 in the A, B,and fault zones are approximately NNW,NWW and NWW,the stress action is mainly horizontal,and strike-slip faulting is dominant in the study area. On the other hand,the direction of the principal stress field in the central Yunnan block changed from NNW to NWW,however,in the region between the Yuanmou and Pudu River faults,the azimuth of the main compressive stress shows that the north-south slip is obvious. While the direction of the main compressive stress of the Xiaojiang fault zone is nearly NW; in the east of the Xiaojiang fault,the direction of principal compressive stress is NW to NNW in the eastern Yunnan block.

A Stochastic Evolutionary Game Perspective on the Stability of Strategic Alliances Against External Opportunism

This paper applies stochastic evolutionary game theory to analyzing the stability of cooperation among members against external opportunism in a multi-firm alliance.The authors first review the pros and cons of pertinent traditional models,and then a stochastic game model on decisions is proposed,where a coordination parameter,a time variable,a punishment effect and bounded rationality are considered.The Gauss white noise is introduced to reflect the random disturbance in the process.Several sufficient criteria on stability are developed,which enable us to investigate"if-then"type scenarios and project the impact of different strategies.

Improving the Performance of Practical Decoy-State Measurement-Device-Independent Quantum Key Distribution with Biased Basis Choice

Statistical fluctuations are unavoidable in realistic quantum key distribution (QKD) due to finite-size effect. Based on the four-intensity proposal on measurement-device-independent QKD (MDI-QKD) in [Phys. Rev. A93 (2016) 042324], we particularly analyze the scenario that only three intensities are used, namely a three-intensity decoy-state MDI-QKD with biased basis choice. After performing full parameter optimization method, simulations results demonstrate that this scenario can obtain distinct enhancement compared with the conventional unbiased threeintensity decoy-state method, e.g. Xu et al.’s [Phys. Rev. A 89 (2014) 052333]. Furthermore, results also show that it works more efficiently by using HSPS than using WCS at longer transmission distance.