高速公路沥青混凝土路面施工质量控制

合肥至安庆高速公路处于夏季炎热、冬季寒冷、潮湿多雨区,四季十分分明,路面面层应具有一定的抗滑、平整、高温抗车辙、低温抗开裂性能,同时具有抗水害以及防止雨水渗入基层的功能,因此,沥青混凝土路面施工时必须确保施工质量。文章介绍了合安高速公路路面03标在路面施工过程中,从沥青混合料的拌制、运输、摊铺、压实及成型等方面论述了施工阶段的质量控制,使沥青混凝土路面达到技术及使用上的要求。     

OFDM系统的多符号改进算法

针对OFDM训练符号同步算法中存在的大采样数据而导致捕获时间过长的问题。提出了一种多符号改进算法。该算法应用对多个符号等间隔取样并共轭相乘累加的方法，在采用小数目的采样数据时就可以取得较好的性能，同时缩短了定时捕获时间，克服了原来算法中存在的问题。最后，仿真表明该算法的有效性。     

关于振兴老工业基地中创新问题的若干思考

在当前国家提出改造、振兴东北老工业基地的大背景下,应该围绕创新这一着力点做文章,积极探索东北区域经济振兴和发展的新思路.创新是振兴东北老工业基地的必由之路,因此,振兴东北老工业基地,创新要有新的思路.要完善制度创新,包括完善政府制度和市场制度,大力推进企业制度创新,从而消除阻碍老工业基地振兴的体制性障碍;要推进集群式创新,依托地缘优势构建区域创新集群,大力发展以产业关联为基础的产业创新集群;还要大力提高自主创新能力,营造良好的自主创新环境和氛围,选择优势领域和主导产业开展自主创新,积极促进科技成果转化.     

东北地区农产品加工业发展战略研究

加快农产品加工业发展是建设现代农业的重要内容,是提高农民收入和解决就业的重要举措.东北地区发展农产品加工业具有明显的有利条件,发展较快,但也存在着发展规模、创新能力、融资等方面的问题.针对东北地区的实际,提出东北地区农产品加工业发展战略.     

振兴黑龙江省老工业基地财税政策的实证分析

财税政策是国家进行宏观经济调控的重要手段,在振兴黑龙江省老工业基地的过程中,应结合黑龙江省当前的财政经济状况及其问题所在,在考虑国家实施稳健财政政策的基础上,阐明黑龙江省等老工业基地和西部地区继续实行积极财政政策的必要性,有针对性地制定激励型和优惠型的财税政策措施,以期对振兴黑龙江省老工业基地和经济发展有所启示.     

财务报告舞弊行政处罚与可感知审计质量

以2001年至2008年间非金融类、非外资类正常交易A股公司为研究样本,考察财务报告舞弊行政处罚是否传递了可感知审计质量信息,实证研究结果表明：投资者总体上并不认可财务报告舞弊行政处罚传递了可感知审计质量信息,仅当投资者观察到反映坏消息的审计意见（如审计师出具非标审计意见、审计意见未改善等）和反映审计师声誉信息（如审计师受到行政处罚）的情况下,投资者才认为财务报告舞弊行政处罚传递了可感知审计质量信息。     

Trends in Approval Times for Genetically Engineered Crops in the United States and the European Union

Genetically engineered (GE) crops are subject to regulatory oversight to ensure their safety for humans and the environment. Their approval in the European Union (EU) starts with an application in a given Member State followed by a scientific risk assessment, and ends with a political decision‐making step (risk management). In the United States (US) approval begins with a scientific (field trial) step and ends with a ‘bureaucratic’ decision‐making step. We investigate trends for the time taken for these steps and the overall time taken for approving GE crops in the US and the EU. Our results show that from 1996–2015 the overall time trend for approval in the EU decreased and then flattened off, with an overall mean completion‐time of 1,763 days. In the US in 1998 there was a break in the trend of the overall approval time. Initially, from 1988 until 1997 the trend decreased with a mean approval time of 1,321 days; from 1998–2015, the trend almost stagnated with a mean approval time of 2,467 days.     

The Costs of Coexistence Measures for Genetically Modified Maize in Germany

We estimate the perceived costs of legal requirements (‘coexistence measures’) for growing genetically modified (GM) Bt maize in Germany using a choice experiment. The costs of the evaluated ex‐ante and ex‐post coexistence measures range from zero to more than €300 per measure and most are greater than the extra revenue the farmers in our survey expect from growing Bt maize or than estimates in the literature. The cost estimates for temporal separation, the highest in our evaluation, imply that the exclusion of this measure in Germany is justified. The costliest measures of the ones that are currently applied in Germany are joint and strict liability for all damages. Our results further show that neighbours do not cause a problem and opportunities for reducing costs through agreements with them exist. Finally, we find that farmers’ attitudes towards GM crops affect the probability of adoption of Bt maize. Our results imply that strict liability will deter the cultivation of Bt maize in Germany unless liability issues can be addressed through other means, for example, through neighbours agreements.     

Forecasting the Adoption of GM Oilseed Rape: Evidence from a Discrete Choice Experiment in Germany

This paper explores farmers’ willingness to adopt genetically modified (GM) oilseed rape prior to its commercial release and estimates the ‘demand’ for the new technology. The analysis is based upon choice experiments with 202 German arable farmers. A multinomial probit estimation reveals that GM attributes such as gross margin, expected liability from cross pollination, or flexibility in returning to conventional oilseed rape significantly affect the likelihood of adoption. Neighbouring farmers’ attitudes towards GM cropping and a number of farmer and farm characteristics were also found to be significant determinants of prospective adoption. Demand simulations suggest that adoption rates are very sensitive to the profit difference between GM and non‐GM rape varieties. A monopolistic seed price would substantially reduce demand for the new technology. A monopolistic seed supplier would reap between 45% and 80% of the GM rent, and the deadweight loss of the monopoly would range between 15% and 30% of that rent. The remaining rent for farmers may be too small to outweigh possible producer price discounts resulting from the costs of segregating GM and non‐GM oilseed rape along the supply chain.     

新旧动能转换的理论探索与实践研判

新旧动能转换是实现创新驱动、推动经济由高速度增长向高质量发展的重大战略举措。从世界范围看,新旧动能转换不仅是世界经济演进的客观规律,也是新技术革命持续发展的必然要求。从国内发展看,新旧动能转换是中国迈向全球价值链中高端、进入经济发展新时代的根本出路。本文通过考察新旧动能转换的内涵和模式,进而从技术效率和技术进步二维视角分析新旧动能转换的动态演进。新旧动能转换包含要素、企业、产业和社会四个层面的着力点。新旧动能转换存在从政府主导走向政府引导、从经济领域走向社会领域、从重点示范走向全面推进、从要素驱动走向创新驱动、从渐进式革新走向颠覆性创新等多条发展路径。