内高压成形技术在汽车轻量化中的应用

内高压成形技术作为汽车轻量化的重要途径之一。本文简要介绍其国内外应用状况,并对该技术在典型的汽车零件中的应用做了详细介绍。     

汽车结构的轻量化设计方法综述

汽车结构轻量化对降低汽车排放和油耗具有重要意义。文章介绍了汽车结构轻量化的几个代表性研究项目;对高强度钢板、铝镁合金及塑料等轻质高强度材料在车身结构轻量化中的应用进行了阐述;围绕新材料的先进成形工艺,如激光拼焊板、液压和气压成形,热冲压工艺等成形工艺,以及自冲铆接等先进连接工艺进行了分析;同时还介绍了有关的汽车结构优化和创新设计方法。最后对汽车结构轻量化设计方法的发展动向进行了展望。     

镁合金的研究及其在汽车轻量化中的应用

文章介绍了镁合金的特性、用途和优势以及镁合金的成形工艺,综述了镁合金在汽车轻量化中应用技术的发展和在世界各国汽车工业中的应用研究现状。同时,对镁合金应用存在的问题进行了讨论。     

从SGMW某轿车车身设计看先进高强钢的应用

介绍近年来我国汽车发展概况,节能与环保的标准要求汽车向轻量化发展的趋势以及汽车用高强度钢板（AHSS）分类。重点以SGMW（上汽通用五菱汽车股份有限公司）某车型车身设计为例,说明大量应用先进高强钢在汽车轻量化方面具有显著效果,同时在提高汽车安全性和环保等方面也具有重大优势。指出研究先进高强钢的成形控制技术,以及在今后新产品车身设计中综合应用先进高强钢来提高汽车安全性是以后重点研究的课题。     

从SGMW某轿车车身设计看先进高强钢的应用

介绍近年来我国汽车发展概况,节能与环保的标准要求汽车向轻量化发展的趋势以及汽车用高强度钢板(AHSS)分类。重点以SGMW(上汽通用五菱汽车股份有限公司)某车型车身设计为例,说明大量应用先进高强钢在汽车轻量化方面具有显著效果,同时在提高汽车安全性和环保等方面也具有重大优势。指出研究先进高强钢的成形控制技术,以及在今后新产品车身设计中综合应用先进高强钢来提高汽车安全性是以后重点研究的课题。     

我国汽车轻量化发展中存在的问题及对策研究

从我国汽车轻量化发展状况入手,对我国的汽车轻量化设计发展进行了分析,阐述了我国汽车轻量化设计施行过程中存在的问题并对问题进行分析.主要问题:汽车轻量化技术缺少政策支持;强调汽车尾气排放标准,而忽视了汽车轻量化技术;国内汽车轻量化消费观念有待引导;某些车企的简配行为,污名化了汽车轻量化技术.针对存在的问题提出了我国汽车轻...     

汽车结构的轻量化设计方法综述

随着科学技术的发展，汽车技术也日新月异。作为汽车结构设计的发展方向--汽车结构轻量化技术也随之迅速发展。文章从新研发的轻量化材料以及采用新技术、新工艺等方面综述了汽车结构轻量化的设计方法。     

高分子材料在汽车轻量化中应用

汽车工业是三大支柱产业之一，而今汽车工业已成为一个国家现代文明与科技水平的重要标志之一。但是汽车工业的飞速发展也给社会带来了能源匮乏、环境污染、安全等诸多问题，汽车的节能、环保与安全既是汽车工业技术的发展方向也是各国产业政策的总体要求。降低燃油消耗和减少污染排放已成为当今汽车工业发展和社会可持续发展亟待解决的关键问题。从国际发展趋势上看，主要采取以下措施：一是大力发展新型能源汽车；二是发展先进发动机技术；三是汽车轻量化。在过去10年间，主要是通过改进汽车动力系统来达到节油和环保的标准，发展至今，动力系统技术的改进已接近极限。而汽车轻量化是汽车零部件重要的发展方向之一，是实现汽车节能减排的最直接和最有效途径。     

浅谈汽车轻量化技术

随着汽车技术的快速发展和人们对汽车使用要求的提高,人们发现了汽车轻量化技术带来的好处,比如在燃油效率、摩擦阻力、汽车稳定性方面表现得最佳。本文简要地阐述了目前汽车轻量化技术的发展水平。     

汽车轻量化技术创新项目风险的识别分析

"轻量化、电动化、智能化、网联化、共享化"是汽车技术发展着的方向。文章简单介绍了汽车轻量化及技术的相关理论与现状,从汽车轻量化技术创新项目风险、内部和外部三个方面对实际发展情况进行风险要素分析分类,确定基本风险评价指标体系,进而提出有效提升技术创新成功的方法,为以后的汽车轻量化的技术发展提供参考。     

城镇给水一户一表工程探讨

“一户一表”改造工程作为供水行业的重点和难点工程，关系着千家万户的切身利益。通过对河池市金城江给水一户一表工程的探讨，为实施城镇给水一户一表工程提供一些参考，进一步推动给水一户一表工作。     

城镇给水一户一表工程探讨

"一户一表"改造工程作为供水行业的重点和难点工程,关系着千家万户的切身利益。通过对河池市金城江给水一户一表工程的探讨,为实施城镇给水一户一表工程提供一些参考,进一步推动给水一户一表工作。     

Global energy forecasting competition 2017: Hierarchical probabilistic load forecasting

The Global Energy Forecasting Competition 2017 (GEFCom2017) attracted more than 300 students and professionals from over 30 countries for solving hierarchical probabilistic load forecasting problems. Of the series of global energy forecasting competitions that have been held, GEFCom2017 is the most challenging one to date: the first one to have a qualifying match, the first one to use hierarchical data with more than two levels, the first one to allow the usage of external data sources, the first one to ask for real-time ex-ante forecasts, and the longest one. This paper introduces the qualifying and final matches of GEFCom2017, summarizes the top-ranked methods, publishes the data used in the competition, and presents several reflections on the competition series and a vision for future energy forecasting competitions.     

大型土木工程无线健康监测系统实现

在大型土木工程建设中,诸如:道路、桥梁、隧道等,传统方法为埋设各种传感器后,技术人员现场通过对传感器进行逐个采集数据。这种数据采集方式不但成本高、效率低,且时效性差。本研究针对某大型工程项目设计了无线检测系统整个系统,系统由三部分构成:下位机部分、中间通信系统,和后台上位机部分。其中下位机部分是由嵌入式系统构成,主要是完成数据的采集;中间通信系统是连接上位机与下位机的通道,保证数据的远程通信;下位机收集数据后,通过RS-232串口通信将数据传递给后台数据处理系统,即上位机。最后实现了一个完整的检测系统,并重点介绍了上位机的实现。     

煤矿综采工作面一通三防安全保障的有效策略剖析

在煤矿安全生产工作中,离不开一通三防。煤矿综采工作面使用通风的方式,主要是为了防止火灾、煤尘、瓦斯三种灾害的发生。论文主要围绕煤矿综采工作面实施一通三防安全保证的意义、一通三防安全指标体系确立以及一通三防安全保证的有效策略三个方面进行探究。     

Social representations and social marketing: Effectiveness of awareness campaigns on the representation of public policies?

The research fits into the theory of the central core within the social representations theory. The approach argues the existence of two components: the core and the periphery. Each one has its own characteristics and a role to play. Within this framework, transformation of social representations can be the consequence of practices modification. However, in this study, we are interested in the effect of communication. We focus on the social representation of the public policy of the 30 kmh speed limit developed in Europe since the 1990's. And we test the impact of two awareness campaigns: the first one aims at reinforcing one aspect of the central core of the representation, the second one aims at contradicting one aspect of the core. Three groups of participants answer a questionnaire of representation related to the 30 kmh speed limit: two experimental groups (each one receiving a campaign) and one control group. Results confirm the relevance of using communication and social marketing methods in order to transform social representations. According to the type information, results are different. Discussion highlights the interest of using social representations in order to build social marketing campaigns.     

The relationship between employees' perceptions of human resource management and their retention: from the viewpoint of attitudes toward job-specialties

The purpose of this study is threefold. The first one is to investigate the relationship between employees' perceptions of human resource management (HRM) based on the commitment model and their turnover intentions (retention). The second one examines the relationship between employees' attitudes toward job-specialties and retention. The third one analyzes the impact of attitudes toward job-specialties on the relationship between employees' perceptions of HRM and retention. The facts and conclusions presented in this paper were obtained from a study of 400 employees. For the first one, the results of a multiple regression analysis showed that perceptions of rewards based on fair appraisal and job security have an effect on retention and moreover, overall perceptions of HRM increased retention. For the second one, results of a multiple regression analysis showed that inter-organizational career self-efficacy has a negative effect on retention. On the other hand, no relationship was observed between specialty commitment and retention. For the third one, inter-organizational career self-efficacy did not have an effect on the relationship between perceptions of HRM and retention but specialty commitment improved the relationship. As a whole, the importance of employees' attitudes toward job-specialties on the multi-step process model of retention and its diverse impacts and relationships were clarified.     

Intermediate goods and the spatial integration of land uses

A model with two commodities, one final and one intermediate, is set out in a spatial context. Each commodity requires land in production and must be transported at positive costs between sites. Two solutions are possible: an integrated one in which the final and intermediate goods share the same site and a segregated one in which final and intermediate goods occupy distinct areas. The condition for determining which pattern will be efficient is obtained and the result plus a numerical example are related to observations reported on the history of urban areas. The phenomenon of two distinct equilibria is found in a model which permits another factor to be substituted for land in production.     

Communicating environmental management certification: Signaling without signals?

This article analyzes how organizations communicate their voluntary environmental management certification. Previous research suggests that firms use certification to signal and to create a better public image as one of their main objectives in adopting environmental management standards. How organizations communicate their certification to their stakeholders has not been fully researched. To fill this gap, this work focuses on the hospitality industry, one of the most relevant sectors for environmental certification, and Eco‐Management and Audit Scheme, one of the most demanding certification schemes. On the basis of the analysis of the communication practices of 201 certified European hotels and 37 interviews with managers from certified hotels, the findings are surprising. The great majority of organizations included in the study engage in no significant communication activity. The results cast doubt in the idea that improving corporate image is one of the main drivers to adopt third‐party voluntary certification.     

Exchange rate regime choice and currency crises

Exchange rate regime choice is not exogenous, but it depends on the structural, political and financial features of countries. However, it is often the case that the regime actually pursued and the one that is imposed by country features do not match one to one. The existing empirical crisis models do not take fully into account the regime in which the crisis unfolded. The aim of this paper is to incorporate the appropriateness of the regime choice into the standard currency crisis model. The results show that the odds of crisis increase significantly in countries which have chosen regimes inconsistently.