减压阀(调节阀)在兰成渝管道中的应用

减压阀是长输管道的重要设备之一,能够通过调节长输管道的压力大小进而实现对管道安全的保护。本文根据减压阀在兰成渝输油管道应用八年以来的实际经验,从减压阀的结构及原理、维护保养、维修安装、常见操作及故障分析等几个方面介绍减压阀以及其在应用过程中的改进。     

Estimated non-linearities and multiple equilibria in a model of distributive-demand cycles

We introduce the results of a non-parametric estimate of the US wage-Phillips Curve into a simplified version of the model of the wage-price spiral by Flaschel and Krolzig (2008). Making use of Okun’s law, the non-linearity in the wage inflation-employment relation translates into a non-linearity in the so-called ‘distributive curve’ of the economy. Exploiting the observed non-linearity in extending an otherwise standard demand-distribution model (Taylor 2004 Taylor, Lance. 2004. Reconstructing macroeconomics. structuralist proposals and critique of the mainstream, Cambridge, MA: Harvard University Press.  [Google Scholar]), we provide a dynamical analysis both in wage-led and profit-led effective demand regimes. In a profit-led scenario, shown to be the empirically relevant case for the US economy, there are two stable equilibria of Goodwin (1967 Goodwin, R.M. 1967. “A growth cycle”. In Socialism, capitalism and economic growth, Edited by: Feinstein, C.H. Cambridge, , UK: Cambridge University Press.  [Google Scholar]) growth cycle type, identified as a stable depression and a stable boom, and a saddle-path stable equilibrium in between them. Both stable steady states are surrounded by trajectories that cycle counterclockwise around their basins of attraction. The obtained type of growth fluctuations can be verified by a long phase cycle estimation for the US economy using a method developed by Kauermann, Teuber and Flaschel (2008 Kauermann, G., Teuber, T. and Flaschel, P. 2008. “Estimating loops and cycles using penalized splines”. Bielefeld: CEM working paper.  [Google Scholar]).     

基于HAR—RV模型的中国证券市场异质性研究

随着高频数据可以越来越方便的获得,过去的ARCH模型及GARCH模型已经不能满足高频数据研究的需要。相比于模型波动率,已实现波动率能够更直接、准确地描述波动率的特征。研究表明,已实现波动率具有长记忆特性,其解释之一即为异质市场假说,即市场中存在异质交易者。文章选取了HAR—Rv模型对已实现波动率进行建模,并且通过回归分析,证明了我国股票市场交易者存在异质性。     

长期股权投资核算的权益法

长期股权投资权益法,其特点是投资最初以投资成本计价,以后根据投资企业享有被投资单位所有者权益份额的变动对投资的账面价值进行调整的方法。本文主要讨论了权益法的涵义与适用范围,通过实例分析了权益法下的会计处理思路等问题,并提出了相应的解决对策。     

小学语文长文短教之我见

"题目"是文章的眼睛,透过文题可以窥探文章的主旨。通过"题目",教师可以熟练地驾驭教材,有效地组织课堂教学,找到教学的突破口,把握文章的中心思想。     

Do global CO2 emissions from fossil-fuel consumption exhibit long memory? a fractional-integration analysis

In this article we use an autoregressive fractionally integrated moving average approach to measure the degree of fractional integration of aggregate world CO₂ emissions and its five components – coal, oil, gas, cement, and gas flaring. We find that all variables are stationary and mean reverting, but exhibit long-term memory. Our results suggest that both coal and oil combustion emissions have the weakest degree of long-range dependence, while emissions from gas and gas flaring have the strongest. With evidence of long memory, we conclude that transitory policy shocks are likely to have long-lasting effects, but not permanent effects. Accordingly, permanent effects on CO₂ emissions require a more permanent policy stance. In this context, if one were to rely only on testing for stationarity and non-stationarity, one would likely conclude in favour of non-stationarity, and therefore that even transitory policy shocks have permanent effects. Our fractional-integration analysis highlights that this is not the case.     

Tourist narratives about the dissonant heritage of the Borderlands: the case of South-eastern Poland

ABSTRACT

One of the important effects of the political transformation after 1989 in Eastern Europe is the development of tourism and increasing mobility of citizens from many countries, previously separated by the ‘Iron Curtain’. The process of economic and socio-cultural change justifies the debate regarding the future, but also on the legacy of the past. As for South-eastern Poland, tourism has been used as an important narrative tool for spreading, strengthening or weakening ethnic and national stereotypes by promoting cultural resources and performances that enable cooperation and mutual understanding. However, it can also be a source of potential fears or conflicts, for instance by creating controversial tourist attractions and stories about certain historical events. This paper discusses strategies of ‘past presencing’ of the heritage of South-eastern Poland border regions in public life, culture and tourism, drawing on a few examples which show different ways of restoring the memory of the former Eastern Borderlands. The theme village called ‘The Borderland Settlement’ and the historical reconstruction ‘Volyn 1943–2013’ relate to the main myths and the active memory concept that frame tourist narratives and contribute to the reinvention and reinterpretation of dissonant heritage.     

农户主体行为与农民土地权益保护

保护农民土地权益需要农民内力和社会外力的共同作用才能有效实现。随着工业化、城市化程度的不断加深,各地侵害农民土地权益的事件时有发生。目前我国农民自我保护意识普遍较弱,对其自身合法权益的维护产生较大负面影响,因此政府有必要从教育、法律、组织、制度等层面引导农民树立自我保护意识。     

Involvement theory in constructing bloggers' intention to purchase travel products

Blogs recently have demonstrated their enormous marketing potential, and more and more travel advertisements are being posted in blogs. In light of this observation, this study aims to provide insights into the structural relationship among travel bloggers' involvement level, the advertising effect from blog messages, and travel bloggers' intention to purchase travel products. A travel blogger's purchase intention model was constructed and empirically tested. A total of 900 questionnaires were distributed to identified travel bloggers; 398 valid responses were returned. The data were examined with Structural Equation Modelling (SEM). The results demonstrated the positive impact resulting from the ad effect as well as the ad effect on purchase intention, which could be verified in travel blog environments. It also indicated that high-involvement travel bloggers are more likely to form favourable impressions with regard to ads in travel blogs. Travel blogs play a positive role in the processing of ad messages; brand management is essential to business marketers since brand attitude is the most influential factor related to the ad effect on purchase intention. Meanwhile, while ad attitude is not significantly effective concerning purchase intention, it remains essential in forming brand attitudes. Several implications for posting advertisements in travel blogs will be discussed and suggested in this paper.     

企业为何要即兴运作:对中国企业战略决策风格的一个检验

文章以中国企业为研究对象,全面探究了其战略决策中的即兴运作行为,认为即兴运作作为一种可供选择的战略行动模式而值得关注.文章的研究结论表明:即兴运作在中国企业是一个较为普遍的现象.企业对战略行动的选择是由多种因素综合驱动的,当企业的组织记忆水平越高、企业家导向越明显以及所面对的竞争环境不确定性程度越高时,企业就越可能采取即兴运作的战略行动方式;即兴运作虽然会对战略行动绩效产生负面影响,但组织柔性会显著降低其负面作用.