注塑机料筒加热节能技术

料筒加热系统是注塑机上主要耗电系统之一,行业中推出的多种节能技术方案受利益格局的影响存在误导行业 和用户的现象。针对这一局面,从节能效果、使用可靠性、安装维护方便性及性价比等要素入手,对目前行业主推的电磁 加热、红外加热、节能环3大料筒加热节能技术方案进行了应用、研究和比较,节能环技术方案具有简单有效、局限性少、 故障率低、成本低等优点,是适合注塑机生产工况要求的最佳加热节能技术方案。     

泛长三角旅游一体化下安徽旅游产品的整合营销

整合营销理论在旅游产品生产和销售中的应用日臻成熟。近年来,泛长三角旅游产品整合营销在理论上和实践上都得到了长足的发展。在泛长三角旅游一体化进程中,安徽省的旅游产品相对单一、产业规模较小、整合开发相对缓慢。安徽旅游产业应以地缘为基础、以品牌为方向进行旅游认知、品牌构建、旅游供需整合和旅游相关者关系整合,把自然山水、休闲养生、人文佛教的徽风皖韵有机结合起来,实现旅游主题、线路、品牌有机融合,推出基于泛长三角一体化的安徽旅游产品,形成泛长三角旅游的重要一极。     

The periodogram regression:correction and comments

Ratios of periodogram and spectral density at different harmonic frequencies are independent if the frequency zero is approached slowly enough. This is an asymptotically relevant condition for the periodogram regression to work with fractionally integrated series. In finite samples, however, this theoretical condition should be ignored as we illustrate experimentally.     

Effect of systematic sampling on arima models

Given a general homogeneous non-stationary autoregressive integrated moving average process ARIMA(p,d,q), the corresponding model for the subseries obtained by a systematic sampling is derived. The article then shows that the sampled subseries approaches approximately to an integrated moving average process IMA(d,l), l≤(d-l), regardless of the autoregressive and moving average structures in the original series. In particular, the sampled subseries from an ARIMA (p,l,q) process approaches approximately to a simple random walk model.     

An Analysis of Rhetorical Devices in Advertisement

Advertisement is closely related to our daily life, trying to persuade customers to purchase different kinds of products with garish propaganda. As a result, various rhetorical devices are widely employed in advertisement due to their special functions in people＇ s consuming.     

Obtaining prediction intervals for FARIMA processes using the sieve bootstrap

The sieve bootstrap (SB) prediction intervals for invertible autoregressive moving average (ARMA) processes are constructed using resamples of residuals obtained by fitting a finite degree autoregressive approximation to the time series. The advantage of this approach is that it does not require the knowledge of the orders, p and q, associated with the ARMA(p, q) model. Up until recently, the application of this method has been limited to ARMA processes whose autoregressive polynomials do not have fractional unit roots. The authors, in a 2012 publication, introduced a version of the SB suitable for fractionally integrated autoregressive moving average (FARIMA (p,d,q)) processes with 0<d<0.5 and established its asymptotic validity. Herein, we study the finite sample properties this new method and compare its performance against an older method introduced by Bisaglia and Grigoletto in 2001. The sieve bootstrap (SB) method is a numerically simpler alternative to the older method which requires the estimation of p, d, and q at every bootstrap step. Monte-Carlo simulation studies, carried out under the assumption of normal, mixture of normals, and exponential distributions for the innovations, show near nominal coverages for short-term and long-term SB prediction intervals under most situations. In addition, the sieve bootstrap method yields better coverage and narrower intervals compared to the Bisaglia–Grigoletto method in some situations, especially when the error distribution is a mixture of normals.     

Error reduction in density estimation under shape restrictions

For the problems of nonparametric estimation of nonincreasing and symmetric unimodal density functions with bounded supports we determine the projections of estimates onto the convex families of possible parent densities with respect to the weighted integrated squared error. We also describe the method of approximating the analogous projections onto the respective density classes satisfying some general moment conditions. The method of projections reduces the estimation errors for all possible values of observations of a given finite sample size in a uniformly optimal way and provides estimates sharing the properties of the parent densities.     

Load-oriented manufacturing control just-in-time production for job shops

The paper describes the principles of load-oriented manufacturing control as a new solution for job shops and its successful implementation in a pump-manufacturing factory. The idea of load-oriented manufacturing control is to limit and balance work-in-process inventory on a level as low as possible in order to accomplish a high work-centre utilization as well as a rapid and in-time flow of orders. As the new system keeps actual lead times on a planned level in a self-regulating way, it allows reliable due-date scheduling. Furthermore it points out the bottlenecks and performs applicable mid-term and short-term capacity planning.     

股份—合作制：通向理想的“自由人联合体”

“自由人联合体”和“重建个人所有制”是马克思在《资本论》中提出的两个重要命题。试图对这两个命题的深刻涵义进行比较准确地把握,在论证《资本论》中“自由人联合体”主要是指未来社会理想的经济组织形态和“重建个人所有制”是“自由人联合体”的必然要求的基础上,进而论证我国一度兴起的“股份—合作制”是通向理想的“自由人联合体”的过渡形式。     

网络环境下英语综合应用能力培养模式的实验研究

以人本主义和建构主义的教学观为理论指导，针对目前大学英语教学的现状，提出一种全新的培养学生英语综合能力的教学模式，并用实验加以验证。新的模式充分体现以生为本，使学习的过程成为学生体验的过程。