加工中心刀具编码系统

在分析一般数控程序编制方法弊端的基础上,介绍了1套实用的加工中心刀具编码系统。该系统以刀具的用途分类,采用8位数字编码。其中,第1位示刀具的基本类型,第2位示刀具的指定类型,第3至第6位示刀具直径,第7至第8位示刀具的其它特征。还举例说明了如何用刀码表示刀具,分析了其优点和推广价值。     

基于可编程控制器的自动抛光机控制系统

介绍了可编程控制器、触摸屏和变频器在抛光机自动控制系统中的应用,给出了实现系统控制流程的硬件和软件的设计,并简述了在系统开发过程中出现的5个技术问题的解决办法。     

蜂窝网络自组织研究及展望

自组织网络技术是提高蜂窝网络运行效率、降低运营成本的重要工具,已作为基本功能在4G标准化初始版本获得引入并得到不断发展。在复杂度更高的5G网络中实现网络自动化管理的需求将进一步增强。回顾了蜂窝网络自组织技术的基本概念、分类和主要用例,分析了主要研究方法;总结了学术界、标准化组织及研究机构的研究进展,重点介绍了基于机器学习的最新研究成果;调查了工程应用现状,分析了自组织网络面临的主要挑战,同时指出了新的研究方向。     

Towards an understanding of excel functional skills needed for a career in public accounting: Perceptions from public accountants and accounting students

Public accounting firms (e.g., Grant Thornton, 2012) are stressing an interest in recruiting accounting students with a proficiency in Excel. The purpose of this study is to investigate which Excel functions are perceived to be important and useful for new hires to understand prior to starting a job in public accounting. We collect survey data from four large public accounting firms as well as undergraduate and graduate accounting students (i.e., potential new hires) to gauge perceptions of Excel importance, knowledge, and usage in public accounting. We find that employees at the firms believe the most important Excel functions are: basic formula, filter and sort data, vertical (horizontal) lookup, formatting of documents, and If/Then statements. In a comparison of new hires at public accounting firms with accounting students, results suggest that accounting students underestimate the importance and usage of some of these Excel functions. In addition, results suggest that new hires’ perceived knowledge on how to use specific Excel functions in their accounting job is statistically different than students’ perceived knowledge on how to use some of the same Excel functions. Our research contributes to educational accounting literature by documenting which Excel functions employers in public accounting want new hires to know prior to starting a job in public accounting. Also, this research informs accounting educators that students’ perceptions are not the same as public accounting employers’ expectations with respect to analytical skills using Excel technology.     

浅析数控曲轴连杆轴颈车床夹具设计的有效改进

数控曲轴连杆颈车床用来加工一般四拐曲轴的连杆颈,该夹具已使用多年,但随着近年来新产品开发数量的增多,已远不能满足使用要求,本文就CF-702数控曲轴连杆轴颈车床的夹具设计,进行有效的改进,具有一定的参考价值。     

A UNIFIED PRESENTATION OF COMPETITION ANALYSIS IN TWO-SIDED MARKETS

The goal of this paper is to present quantitative tools to manage competition policy analysis in two-sided platforms, based on a common framework for transaction and non-transaction platforms. We explore tools for relevant market definition [Critical Loss Analysis and a small but significant non-transitory increase in price (SSNIP) test], unilateral effects indicators [Upward Pricing Pressure (UPP) and Gross Upward Pricing Pressure Index (GUPPI)] and tests for exclusionary practices. We review dispersed results in the literature and fill the gaps where appropriate. We highlight the required changes from the usual one-sided market framework and tools. While discussions of antitrust tools can be found in specialized forums devoted to advances in competition policy analysis, we organize the material in an integrated framework.     

Bayesian forecasting of electoral outcomes with new parties’ competition

We propose a new methodology for predicting electoral results that combines a fundamental model and national polls within an evidence synthesis framework. Although novel, the methodology builds upon basic statistical structures, largely modern analysis of variance type models, and it is carried out in open-source software. The methodology is motivated by the specific challenges of forecasting elections with the participation of new political parties, which is becoming increasingly common in the post-2008 European panorama. Our methodology is also particularly useful for the allocation of parliamentary seats, since the vast majority of available opinion polls predict at national level whereas seats are allocated at local level. We illustrate the advantages of our approach relative to recent competing approaches using the 2015 Spanish Congressional Election. In general, the predictions of our model outperform the alternative specifications, including hybrid models that combine fundamental and polls models. Our forecasts are, in relative terms, particularly accurate in predicting the seats obtained by each political party.     

逆周期监管工具、机制与中国的选择

本文梳理并总结了国内外专家学者对逆周期监管主要工具和机制的最新研究成果,分析了中国的经济周期与宏观调控的措施,提出了我国建立适当的逆周期监管工具和机制的路径选择。     

风冷节能装置对风冷式机房空调节能作用的研究——风冷节能装置的应用

本文提出了一种新的风冷式机房空调节能设备,该设备通过提高风冷式机房空调的性能来降低机房空调的能耗,并通过理论计算证明风冷节能装置可以有效地提高风冷机房空调的EER,节能效果明显。     

盾构机直接切削玻璃纤维筋洞门进洞技术

玻璃纤维筋是一种非常适用于NOMST工法的材料。文章介绍了玻璃纤维筋的物理力学性质。以珠江三角洲城际轨道交通广州至佛山段土建12标(西朗—鹤洞)盾构区间工程为应用背景,介绍了玻璃纤维筋围护桩的施工技术及盾构机采用NOMST工法直接切削玻璃纤维筋围护桩洞门进洞的施工技术。初步探讨了进洞过程中盾构推力对车站接收端墙的作用,采用有限元法进行了模拟分析,并在此基础上提出了NOMST工法进洞时盾构推力的确定方法。