环渤海地区农业绿色发展水平评价与区域差异分析

[目的]科学评价农业绿色发展水平,测度环渤海地区农业绿色发展区域异质性,厘清农业绿色发展关键路径,对促进该地区农业高质量发展具有重要意义。[方法]文章以环渤海地区4省2市1区为研究对象,构建农业绿色发展评价指标体系,采用熵权法测度农业绿色发展水平,综合运用耦合协调度模型和变异系数法解析该地区农业绿色发展空间异质性特征。[结果]（1）环渤海地区农业绿色发展水平整体呈现递增态势,其中产出效益变化显著;（2）对比2005和2019年,环渤海地区4省2市1区农业绿色发展路径具有典型区域差异性：2005年京晋和内蒙古资源节约表现显著,津冀辽鲁环境友好表现显著;而2019年京产出效益表现显著,津鲁辽冀环境友好表现显著,晋和内蒙古资源节约表现显著。（3） 2005—2019年环渤海地区4省2市1区农业绿色发展耦合协调度呈现上升趋势,但处于低度耦合协调阶段,耦合协调度变异系数呈现下降趋势,农业绿色发展区域差异性逐渐降低。[结论]资源节约与环境友好层面是推进环渤海地区农业绿色发展的重点方向,制定差异化区域发展战略,加强区域间联系,发挥京津城市辐射效应,缩小区域之间差异,促进环渤海地区绿色农业的协调发展。     

How effective is a fat subsidy? Evidence from edible oil consumption in India

Taxes on fats and sugar-sweetened beverages are deployed in the developed world to encourage healthier diets. How effective might such fiscal instruments be in emerging economies? We evaluate the impacts of a subsidy for palm oil, introduced as part of the public distribution system in three Indian states. Using variants of the difference-in-differences approach, we find that palm oil consumption increased, particularly in rural areas, as a result of the subsidy, and traditional oils were displaced by cheaper palm oil. However, the intervention did not significantly alter overall edible oil consumption. These results are robust to different specifications, alternative estimation samples, and the exclusion of households who may have been potential beneficiaries of other interventions. Impacts were higher in Tamil Nadu than in other states, and were higher for vegetarian households in rural areas. There was only weak evidence of spillover income effects on other food groups. Given India's dual burden of malnutrition, our analysis suggests that fiscal policy interventions have the potential to effectively nudge consumer choices towards healthier edible oil consumption.     

皖江城市带县域经济发展时空差异分析--基于2000～2012年实证探讨

以皖江城市带为例,从规模、质量、潜力3方面构建评价指标体系,运用熵值法测度2000~2012年皖江城市带县域经济发展综合值;并通过ESDA模型揭示皖江城市带县域经济发展时空差异特征。结果表明：2000~2012年县域经济发展综合值增幅达到32.29%,变异系数CV上升说明县域经济发展差异日趋显著;县域经济全局上呈现出空间自相关性,表现出集聚型发展模式;局部上热点区主要分布在芜湖、合肥的县（市）,而冷点区主要分布在池州、安庆的县（市）,且分异格局相对稳定。并从重组城镇空间结构、调整城市产业格局、完善区域基础设施3个方面提出皖江城市带县域经济协调发展的整合建议。     

新创企业成长阶段与高管行为整合的匹配性:案例研究

在对新创企业的成长阶段进行划分的基础上,采取典型案例研究方法,分阶段地探讨高管行为整合与新创企业成长阶段的匹配性。研究发现:新创企业的成长在青春期阶段与高管行为整合的关系为不匹配,在调整期阶段与高管行为整合的关系需要根据企业是否具有行为整合的条件来确定,在稳定期阶段与高管行为整合的关系为匹配。     

我国省域视角下经济增长方式的实证分析与对策——基于 1990-2012 年数据

经济发展方式转变是我国现阶段经济发展的必然选择,也是经济增长与自然、社会、人的全面发展相协调的客观要求。我国28个省（市、自治区）1990---2012年数据显示：我国经济增长呈粗放型发展;投资拉动和工业化是经济发展主要依靠,第三产业带动作用不强,人力资本的外溢效应不明显,技术具有正向作用,但科技资本存量的产出弹性较小．,外资和出口具有拉动作用;东部经济增长受出口拉动最为显著但受外资企业出口影响而削弱,合适的政府规模才有利于经济发展和增长。因此,未来我国应在人力资本、新型工业化、转变政府职能、均衡发挥内外生因素等方面转变和加强。     

用于高动态目标探测雷达的相位编码脉冲压缩技术

为避免多普勒频移对相位编码信号脉冲压缩处理的影响,提出了利用已知脉冲编码序列对回波信号进行逐符号共轭点乘的脉冲压缩方法,将对齐的回波信号转换为单频信号,并利用傅里叶变换实现信号能量的积累。理论分析与计算机仿真表明,多普勒频移对脉冲压缩性能无影响。该方法适合于应用到对高动态目标进行探测的雷达系统中。     

沪深300ETF 拟合效果的比较研究--基于华泰柏瑞沪深和嘉实沪深300ETF

文章比较分析了沪深300股指期货套期保值所采用的几种现货工具：上证180ETF 或上证50ETF 和深证100ETF 构建的 ETF 组合、华泰柏瑞沪深300ETF、嘉实沪深300ETF,实证检验了两只沪深300ETF 以及 ETF 组合对沪深300股指期货的拟合效果的差异,为现货工具的选择给出建议,并为后续对沪深300ETF 的套期保值的研究做出铺垫。     

Foreign Entry into Underwriting Services: Evidence from Japan's “Big Bang” Deregulation

We examined the effect of foreign entry into bond market underwriting activity using issue‐level data from the Japanese “Samurai” and euro–yen bond markets. We found that the fees charged by Japanese underwriters were higher on average than those of foreign underwriters, but the difference could be explained by conditioning on issue characteristics. Our results also suggest that bond issuers sorted properly across underwriters, as switching across underwriter nationalities would be expected to result in higher fees. However, the savings enjoyed by firms issuing with foreign underwriters were modest and statistically insignificant, while those of firms issuing with Japanese underwriters were substantial and statistically significant. This result suggests that Japanese underwriters priced their services aggressively over the sample period, perhaps in an effort to retain or gain market share. This conjecture is supported by a matching exercise that examined the liberalization of foreign underwriter access to the Samurai bond market, using euro–yen bond issues as a control. Foreign entry led to a statistically and economically significant decrease of 16 basis points on average in underwriting fees in the Samurai bond market. Overall, our results suggest that the international market for Japanese bond underwriting services was partially segmented by nationality as issuers appear to have preferred habitats, but that liberalization increased overall market competition.     

Contracts for dummies? The performance of investors in contracts for difference

Investors widely use contracts for difference (CFDs) to leverage and short sell underlying financial assets. We investigate the after cost performance of investors in Australian Securities Exchange listed share CFDs, and find that market order CFD trades earn small positive returns at the daily horizon, with negative returns reported for one month to one year horizons due to financing costs. Market orders also net sell positions, which suggests that investors use CFDs for shorting opportunities. Overall, we find that liquidity demanders in CFDs obtain favourable execution, which is inconsistent with the view that CFDs are used by naive individuals.     

大成话词汇与广州话词汇差异比较分析

广西平南县大成话属于粤方言的次方言,在词汇上,大成话和广州话的特点大同小异。文章主要从词汇的构词形式、词汇的意义两个方面来比较分析大成话与广州话的词汇差异,并从语音变化的影响、语言继承的影响、语言接触的影响、语言认知的影响、社会文化的影响和社会分工不同的影响等6个方面来探讨大成话词汇和广州话词汇差异的成因。