齿轮耦合的转子-轴承系统非线性动力特性的研究

在考虑齿轮时变啮合刚度、齿侧间隙、脱齿、挤齿及齿背接触 等因素的情况下，建立了齿轮耦合的转子—滑动轴承系统的多自由度动力学模型。用数值方 法研究了该系统的质量不平衡响应，结果发现，由于齿轮时变啮合刚度的影响，随着转速的 增加，系统动力学响应首先由周期运动向准周期运动变化，当转速超过某一值时，系统的响应将由准周期运动发展为混沌运动；由于混沌运动，转子将沿齿轮中心线方向产生很大的变 形，脱齿、齿背接触及挤齿现象也将发生，可能导致系统产生破坏。

Multi-scaled simulation of latticed frames considering bending collapse of pipes

To consider the bending collapse of the pipes in the latticed frames, based on the multi-scale simulation, the collapsed parts of the pipe are meshed by the shell elements as micro-scaled models, and the other parts are meshed by beam elements macro-models. The incremental displacement constraint equations for the nodes on the section between the two models are established based on the plane section premise of classical beam theory. The method to introduce the constraint equations is derived based on the Updated Largrangian method. The location of the micro-model is predicted by the stress field of the beam element, and the length of the collapsed part is adjusted by the plastic energy in the micro model. Several examples are included to illustrate the efficiency and accuracy of this method.

Seismic performance testing of reinforcement concrete frames strengthened with Y-eccentrically brace

Two single-storey single-span reinforcement concrete （RC） frame structures strengthened with Y-eccentrically brace were designed and manufactured to be 1/3 scale. The pseudo-dynamic testing method was used to study the mechanical characteristics and the seismic performance under E1-Centro earthquake action with different peak acceleration adjusted by China＇s Code for Seismic Design of Buildings. The test results indicate that RC frame structures strengthened with Y- eccentrically steel brace present perfect seismic performance under strong earthquake action owing to the good ductility, strong bearing capability and fine energy absorbing capability provided by energy dissipation element and high lateral stiffness provided by diagonal braces. The seismic performance is also affected by the length of outsourcing steel at the joint between energy dissipation element of eccentric steel brace and RC frame beam. The joint should be considerably designed to make sure that shear failure can firstly occur in energy dissipation element.

Reducing sugars production from pretreated rapeseed straw

Lignocellulosic biomass, being treated only with ammonia, treated with ammonia and then autoclaved, and treated with white-rot fungi after being mechanically chipped, were carried out to access the effects of lignocellulose degradation by white-rot fimgi cultured on rapeseed straw. Fourier transform infrared spectroscopic analysis was used to show that the white-rot fungus Bjerkandera sp. strain increase the susceptibility of straw to enzymatic saccharification by modifying the lignin component, revealing the effect of these pretreatments on enzymatic saccharification. Reducing sugar production from straws pretreated by ammonia/mechanical chipping/fungi degradation was 29.80% higher than the samples treated with ammonia/autoclaving, indicating an effective degradation of phenolic compounds. After ammonia pretreatment 41% of the straw was converted to RS （reducing sugars） （glucose 50%）. After 5 weeks pretreatment with the white-rot fungus, 54.8% of rapeseed straw was further converted to RS, 74% of which was glucose; while only 12% of the control straw was converted （glucose 42%）. The white-rot fungus Bjerkandera sp. strain degraded rapeseed straw preferentially at the early stage （before 20 d）, and the degradation selectivity was 0.181 1 （cellulose）, 0.364 1 （hemicellulose）, and 0.454 8 （lignin）, suggesting that removal of the phenolic barriers enhanced reducing sugar yield, and the efficiency of fungal pretreatment was comparable with that after alkali treatment, resulting a higher proportion of glucose in the hydrolysates.

A QoS-aware scheduling algorithm for combined-input-crosspoint-queued switch

In this paper, we study the quality of service requirement and guaranteed-rate scheduling problem for combined-input-crosspoint-queued (CICQ) switches. Using crosspoint buffers between input queues and output ports, the input and output scheduling can be decoupled in CICQ switches. Here we propose a new guaranteed-rate scheduling algorithm which is divided seperately into input and output scheduling. Simulation results show that our algorithm can perform better than existing scheduling schemes in both packet loss and jitter control.

Effects of surface modification by Ni, Ti and B on electrochemical properties of Mg_(1.8)Cu_(0.2)Ni hydrogen storage alloy

Amorphous alloy Mg1.8Cu0.2Ni was successfully prepared by mechanical alloying （MA） and a series of （n-x）Ni- x（Ti＋B） composites were synthesized by MA. The electrochemical properties of Mgl.8Cu0.2Ni coated by Ni, Ti and B were studied by cyclic charge-discharge, linear polarization curve, and hydrogen diffusion coefficient experiments. Experimental results indicate that Mg1.8Cu0.2Ni-[0.9Ni0.6（Ti＋B）] composite which was MA 30 h exhibited the best performance and its initial discharge capacity arrived to 714.1 mAh/g. After 30 cycles the discharge capacity was above 530 mAh/g, which was much higher than that of Mg1.8Cu0.2Ni. And after 100 cycles it holded still 442.1 mAh/g. On all accounts, after modification by Ni, Ti and B, the initial discharge capacity and high-rate discharge ability of the electrode were evidently increased. At the same time, the cycle performance was also improved significantly.

On construction waste disposal in Chongqing

With rapid development of the construction industry in China, lots of construction materials are being widely reused. Meanwhile, more and more materials for building remover or demolition enter into the environment as a result. However, China is facing big building garbage pollution, with simple disposal methods and low efficiency, which urgently needs to be improved. The paper takes Chongqing as an example to illustrate existing problems in this field and then puts forward corresponding countermeasures from the aspects of economy, technology, management and policy, aiming at enhancing the level of construction waste disposal in China.

Case Study of Three Arab American Language Identity： Bilingual, Binational, or Both

Growing applied linguistics research has discussed the upsurge of the usage of Arabic language among Arabic speakers in the United States （Bale, 2010; Sehlaoui, 2008）; language contact and conflict among Arab Americans （AAs） （Rouchdy, 2002）; and how mobility--both virtual and physical--influences their identities （Duff, 2015） This study researches how AAs define their affiliation to the Arabic language in the United States to understand their attitudes on language variety and ethnic diversity, religion and identity, and stereotypes of Arabs. After analyzing interviews, all three AA participants self-selected their identity based on linguistic and physical contexts Thus, the findings suggest further research on AAs should consider cyber identity as a factor for bilingual speakers and compare it with Arabic speakers in their home country

To sex in Ragtime

＂More than a book, it＇s an experience--startling, viscerally satisfying, and as joyous as a happy love affair--Cosmopolitan＂ （Doctorow, 19751）. E.L. Doctorow＇s masterpiece Ragtime has intrigued quite a great deal of critics＇ attention worldwide. However, ironically, hardly any attention was paid to the sex and lovemaking scenes in Ragtime which have been overshadowed by Doctorow＇s splendid and original post-modernist approaches. The author wants to take up this challenge and commit herself to the appearance and role of sex and lovemaking scenes in Ragtime and more importantly, the deeper meanings behind them. Hopefully, this paper will give new perspectives to the understanding of this novel.

On the Techniques of Translating Allusions

Allusions are full of cultural connotations. How to make people in different countries understand each ot^er？ Translation will be one useful way. Translation is the bridge of cultural communication. How can translators translate allusions correctly？ Firstly, translators should have a general idea about the specific cultural connotation of allusions. Each allusion has its own cultural background. Otherwise people would have difficulty in understanding allusions, and they may misunderstand them. Secondly, translators should try to find suitable methods in translating them. The result will be different if translators choose different methods

A Study on the Word-formation of Chinese Coordinative Compound Words Denoting Kinship＊

In Chinese, compound words denoting kinship axe frequently used. This paper classifies such words into two categories： coordinative and non-coordinative. Each type has subcategories. Under the framework of Distributed Morphology, this paper focuses on the coordinative compound words. They consist of two roots which finally form a NP with the category-giving morpheme. Besides, there are some idioms and infrequent uses which can be explained in the Encyclopedia.

Alienation of the soul ,Interpretation of The love song of J. Alfred Prufrock

The love song of J. Alfred Prufrock is known as the first masterpiece of modernism poetry. Its protagonist Prufrock is not a concrete single person, but an abstraction of all modem men in trouble. He is alienated by women, time and space, and hence he is paralyzed and helpless. The use of dramatic monologue and stream of consciousness, quotation and allusions, objective correlative and startling imagery, irony and anti-climax, refrain and rhythm, fragmentation and juxtaposition not only deepens the theme, but also establishes Eliot＇s reputation as a leading modernist poet.

An Invisible Existence Between Life and Death in Al-Koni＇s The Bleeding of the Stone

The Bleeding of Stone traces a philosophical concept related to the existence of humankind. The uniqueness of the story＇s setting and the main character provide a metaphysical ontological dimension. The notion of the metaphysical existence is drawn into public within the atmosphere of the novel through certain elements; religion, time and space, and freedom. The present paper investigates on these factors and their roles and relations to convey and reach a metaphysical ontology. I argue, in this paper, that the metaphysical existence is established as a state between life and death. This state is created through a dialectical relationship between man and desert where there are unseen struggles between the two for immortality. However, the ultimate result of losing the battle is known for the man, yet deliberately ignored because oftke instinct for immortality

Motivating Community College Students When Teaching Argumentative Rhetorical Style Using a Documentary： Devil＇s Playground

Competence in academic writing in college is a challenging as well as an engaging task for many college students. Argumentative writing and acknowledging the counterargument is one of modes that is introduced in freshman classes; however, college students approach writing with a certain mindset. Learning to write in different modes could be exciting when taught utilizing a film or a documentary. Using a documentary, such as Devil＇s Playground, writing professors not only initiate interest in culture learning and cultural understanding but also motivate students to use argumentation to foster critical thinking as well as cultural understanding.

Review and critique of the literature on Business English as a branch of ESP

Over the last few years, Business English has attracted increasing interest and awareness. At present, the mainstream viewpoint is to see the Business English as a kind of ESP and a comprehensive course which absorbs the methodologies of other courses based on the linguistics. However, there are also some critiques. Some people criticize that to see Business English as ESP can not uncover the characteristics of Business English. After reviewing relevant studies and theories, this paper provides some viewpoints on Business English as a branch of ESP and its critiques. On basis of the analysis, some findings will be offered in the conclusion part. Hopefully, it can offer some insights into Business English study in the future.

A Study on the Teaching of Lexical Phrases in Non-English Majors＇ Argumentative Writing

Compared structural approach with communicative approach, the former puts too much emphasis on linguistic knowledge and neglects the language application, while the latter lays too much emphasis on the communicative classroom activities and neglects the systematic study of linguistic knowledge. Both of them cannot meet the requirements of improving the non-English major students＇ argumentative writing scores. So based on the Lexical Approach theory, taking the College English Integrated Course 4 （LI, 2003） as the main teaching material and lexical phrases as teaching and learning units, this study explores the effectiveness of the Lexical Approach in improving non-English major students＇ argumentative writing through classroom activities of input, absorption, and output of lexical phrases. The results show that lexical phrases have more effects on students＇ English competence than single words. They can help to improve the argumentative writing scores and cultivate an interest in learning English independently.

Structure, Passion and Dynamic Characteristics Study on Sergei Eisenstein＇s Thought of＂Film Structure＂

Sergei Eisenstein was labelled as a theory master of ＂montage＂ for a long time, but also film theory pioneer that seems to be somewhat ＂outdated＂ in the eyes of the modem people. In fact, he was one of the most important figures who created a few of theories and also were good at film creation in the film history of over years. He was not only an outstanding master-level film director, but also film theorist who created rich thoughts to the world. He often discussed the film theories with intercommnnity by taking his own works such as Bronenosets Potyomkin for an example, and simultaneously connected paintings （especially the Oriental painting）, music, literature and others with new arts in the writing of theories, so that the construction of his own film theories was accomplished. The focus of this paper is the later consideration of Sergei Eisenstein on the film works structure. Also, his theoretical system and contemporary significance are rethought by studying a series of thoughts such as ＂works structure＂ , ＂dynamic characteristics＂ , ＂logarithmic spiral＂ , ＂golden section＂ and ＂passionate structure＂ .

Desirability of Knowledge Management in Civil Engineering Consulting Firms

KM （knowledge management） has in the recent past been promoted as a means of harnessing and utilising intellectual resources and to improve innovation, business performance and client satisfaction within the construction industry. However, there has been no attempt to ascertain the required level of KM within any given firm. The study reported in this paper aimed at establishing a general equation for assessing a firm’s required level of KM. Through literature review and a questionnaire survey, a total of 22 key indicators of KM were established. The interaction and effects of the key indicators against turnover and employee base were established, yielding an elliptic paraboloid fitted graph over which desirability could be calculated. It was observed that there is a continuous relationship among the firm’s turnover, employee base and the identified key indicators. In practice, firms have different combinations of the employee base and turnover. The derived equation fits well with the different combinations. Firms can, through the use of such equations, determine the level of effort and investment required to implement KM.

Remembrance and Exile in Argentina＇s Jewish Diaspora： The Poetry of Adriana Stein

In Ultimospoemas a Buenos Aires, Adriana Stein, like many contemporary Jewish Latin American writers,explores the nature of remembrance and exile within the context of social justice not only in the Americas, but also within the broader context of world politics. Her collection of poetry, published as an e-book in 2015, traces the legacy of the Jewish diaspora in Argentina through her own experiences and those of friends and family as she summons memories of the disappeared during the Dirty Wax from 1974 to 1983. Some of the poems contained this collection were first published under the name of Adrimm Stein Fourmma on the Proyecto desaparecidos for Argentina, the website dedicated to the memory of the victims of the military regime and to exposing their repressors. Themes of the marginalized or fragmented self as well as both internal and external exile common in works by diasporic communities throughout Jewish history also find expression in Stein＇s collection, along with the oft repeated history of Shoah. Indeed, through her poetry, Adriana Stein contributes to the wider discourse of the politics of identity that serves as literary testimony of the perpetual struggle for humma rights that focuses on diasporic societies in Latin America and elsewhere