数控机床的许多误差元素相互耦合、相互影响,单一的误差补偿可能会造成过补偿问题.在机床几何误差和热误差补偿的同时还必须考虑切削力和刀具磨损等引起的误差,并且建立各误差之间的耦合关系.本文主要提出了温度测点在机床上的优化布置方法和在众多温度元素中选择关键温度元素的方法,通过选择温度敏感点,使得数控机床热误差数学模型的精确度更高,鲁棒性更好,而且热误差数学模型中的温度元素更少.
Communication technology and the development of the Internet on the development of Internet financial put forward higher requirements,the Internet financial global change is imperative,our country should keep up with the trend of the Internet financial globalization,under the traditional marriage of financial industry and the Internet technology to promote the financial industry opening to the outside world. This article is based on the definition of the Internet financial and the Chinese model,combined with the globalization of the Internet financial development direction,a review of the development process of China's financial industry to further;The emergence of the Internet financial and development path of through direct and indirect open the financial sector; According to our country's present situation of regulators,government departments and recommendations to the traditional financial institutions,to promote the process of our financial industry opening to the outside world.
The existence of private prosecution,as the supplement of public prosecution,is mainly to implement the victim criminal appeal. At the same time,it brought negative exercise to appeal right to restrict,which always take a place in the system of criminal action in China. But due to its inherent defects,it can't adapt to the development of criminal charge. So,in the protection of the victim and effective participation of relevant relief,on the basis of the abolition of private prosecution,it is inevitable to develop criminal procedural law.
The orthodoxy thought has a long history in Chinese traditional culture which is logic,rich and connotation. The orthodoxy thought has a clear development context,based on identity consciousness,orthodox consciousness,hiromichi consciousness,with continuous development and improvement,showing a strong historical vitality. Orthodoxy is the main feature of the Confucian doctrine and the mainstream ideology throughout the Chinese history which has been established the dominant position of the ruling class in the field of discourse right through the aggrandizement of the will of the state. Nowadays in the field of ideology,we confront complex challenges; we need to learn from the useful experience of Confucian orthodoxy,constructing the discourse system which contains historical logic,realistic logic and the logic of the development from the angle of historical development. In this way,we can complete the modern conversion of the orthodoxy thought,grasp the ideological discourse right and consolidate the mainstream ideology.
With the fast expansion and wide application of internet technology and information technology,collection of the large-scale database from all over the world has become an important technology information treasury. The bookResearch on Knowledge Network of Patent Technological Topics by Dr. Sh en Jun is based on his doctoral dissertation. This book,taking patent document of 3G mobile communication technology in patent database as research subject,explores effectively on the methods to reveal the evolutional paths of targeted domains and their hidden regularities.
In this paper, using vanadium pentoxide and sulfuric acid as raw materials, through chemical synthetic prepared electrolyte for vanadium battery.When the sulfuric acid which is supporting electrolyte is 2 mol/L, the electrochemical properties of different vanadium ion concentration of positive electrolyte were studied.When the vanadium ion is 1.5 mol/L and 3 mol/L, add ethanol and KHSO4 to positive electrolyte and then tested them by cyclic voltammetry.The experimental results show that when the support of sulfuric acid electrolyte concentration is 2 mol/L and without any additives, electroactive material V4+ is 2.5 mol/L, the electrochemical activity is best, the current density is maximum; when V4+ concentration is less than 2.5 mol/L, adding ethanol and KHSO4 is no effect to the electrochemical additives;when V4+ concentration is greater than 2.5 mol/L, alcohols which have complexing effect will decrease electrolyte electrochemical activity, and nonalcohols have little effect.
Previous subdivision control motor borrowed hardware technology to achieve its realization segments, but the process is complex higher costs, and ultimately there will be a shock at the realization of the motor current subdivision phenomena lead to insufficient segments precision. Now, with advances in technology, FPGA widely at present many circuit applications, especially prepared especially for motor control applications subdivision can play a very good effect, FPGA use the movement of the motor can be precisely controlled to achieve the motor precision positioning and positioning repeatability, solve a lot of practical problems in motor production, to bring a good performance.
Jinglong Literature Records has been scattered and lost for long. At present,a few scholars are engaged in its compiling. Jia Jinhua did the most compiling and addition job among them with high credibility and more supplements are to be needed and to be consulted. Referred to other ancient books,eight editions are to be supplemented. Besides,in view of its incompleteness and improperness,the author puts forward to six supplements.
In college English teaching,language laboratory plays an important role. As the rapid development of college English teaching,language laboratory owns more and more functions. Sound and strict management is needed to improve the quality and achievements of college English teaching. In this paper,based on the author's own experience,the author explores the management,maintenance of language laboratory and puts forward some strategies.
This article will first space linear equation of equivalent transformation, so that it can be combined with the piecewise curve fitting in the plane of the mind, according to least square method and the piecewise linear equation, thus puts forward the three dimensional space discrete points of least squares piecewise linear fitting method, so as to reveal the inherent law between the 3 d data, to verify the validity of the method through the experiment.
The college pays enough attention to the work of The National College English Grade Examination. It has started with the construction of examination system,organizing practical management,and propaganda of the examination discipline of students in order that The National College English Grade Examination can be carried out smoothly.
The Navigation Acts of 1651 is a restrictive legislation made by Cromwell government to combat trade rivals and protect the domestic maritime trade monopoly. The legislation was produced under the background of Anglo- Dutch for world trade hegemony,which closely related to the prevalence of mercantilism,and can be viewed as an important example of the combination for the strategic and economic factors. The Navigation Acts hit the Dutch Marine trade,and promoted the rise of the British sea power,which brought the great influence to the Britain's international trade dominance.
Using the method of combining Petri dish germination and Pot experiment, Melon(Cucumis melo L.) seeds and seedlings can be treated with separate and mix salt stress with 50,100,150,200 and 250 mmol/L mixed salt solution containing different proportions of Na Cl, Na2SO4, Na HCO3 and Na2CO3. α-amylase,Proteolytic activity,Chlorophyll,Proline and Hydrogen peroxide contents and a series of threat index changes are determined. The result shows that the physiological effect of single-salt and low-alkali stress are not significant with the salt concentration increases in contradistinction to the Single low-salt soda ash processing and stress, with the increase of the concentration of alkali, the effect of the change indicators intensify.With the concentration of alkali and alkaline salts increase, the jeopardize of salt aggravates and more serious than the former shows synergy and additive effect to some content.
突发事件应对管理已成为高校安全稳定工作的热点问题.本文介绍了高校突发事件应对管理的基本概念,分析了高校突发事件应对管理的意义,并以信息为核心要素,从基本概念、特性、采集、信息流等方面,阐述了信息与高校突发事件应对管理的紧密关系,力图转变高校突发事件应对管理观念,强化高校突发事件应对管理的信息意识和能力.
Cultural relics as national history and culture may strengthen national identity in recognition of outstanding significance.Chinese modern history witnessed a number of cultural relics lost overseas; under the background of the new government and folk level widely use diverse recourse path to achieve the return of cultural relics,assessment will help to deepen the theoretical research in the perspective of international law of different legal,diplomatic,commercial path. Combined with Chinese practical dialogue,summarize the progress of the frontier,focus on the introduction of the new Dunhuang Declaration and"Buddha in the flesh"has profound practical significance.
作为就业"容纳器"的小微企业,为我国社会提供了70％以上的就业机会,其健康发展直接影响着社会的稳定.然而,在人力资本竞争时代,人才规模和人才使用效率不足等问题严重制约着小微企业的健康持续发展.基于角色理论和共享理论的人力资源的共享可以扩大小微企业人才规模,提高人才使用效率,使小微企业以较低成本获得更丰富的人力资源成为可能.
In empirical aspects, this paper is based on Shanghai stock index and Shenzhen index component portfolio for research object, and takes closing price from Jan.25th, 2010 to Dec.28th, 2012 as the valid data. By comparing the empirical results,it can draw conclusion that the two kinds of Copula Function selection methods are feasible, indeed using the preferred Copula Function to establish GARCH(1,1)-t model, also for Copula applications in portfolio risk research provides a new idea. The paper use Copula-VaR-GARCH model to imitate financial time series and compute VaR by Monte Carlo simulation, studying on stock market volatility(risk)and the relationship between expected return has important theoretical significance and practical value.
According to Fayyad research, C4.5 algorithm on continuous attributes into discrete process was modified to improve the classification accuracy and computational speed. For information on student achievement and employment survey data, C4.5 algorithm uses the improved data mining models were constructed student academic achievement and employment analysis model. The model analysis showed that differences between schools to train personnel and business needs of personnel, affecting the employment of college students. The model to analysis the cause of the imbalance of university studentsu0027 employment effectively provide help, and to formulate a scientific and reasonable personnel training scheme for the school provide a decision aid.
Optical wireless communications technology , using laser beams , direct transmission of image , voice, data, Has the characteristics of portability, transparent protocol, wide bandwidth etc.Analysis of the FSO system, the atmospheric window appears in the band, and study of atmospheric channel modeling. Research of atmospheric channel model has great academic value for FSO system design is excellent.
Anodic aluminum oxide(AAO) as hard template and block polymers P123 acted as soft template, the one-dimensional rare earth mesoporous nanomaterials were synthesized. The mixture of praseodymium nitrate, P123, ethanol and water used as precursors, the nano channel of AAO template were filled with precursors and annealed, one dimensional Pr6O11 mesoporous nanomaterials were obtained in the hole of the AAO template. The synthesized products were characterized by TEM, XRD, XPS, and other analytical testing methods. The one-dimensional Pr6O11 have mesoporous strcture, uniformly distributed and larger surface area. The one-dimensional Pr6O11 have a good adsorption capacity for Congo Red solution, and the maximum adsorbent rate can reach 97.24%.
