凉粉草水煎液的高效液相色谱离子阱质谱分析研究

目的建立凉粉草水煎液化学成分的高效液相色谱离子阱质谱分析方法。方法凉粉草采用水煎煮,煎煮液采用高效液相色谱离子阱质谱对其主要化学成分进行分析研究。结果在优化的实验条件下,凉粉草水煎液的高效液相色谱质谱图中有16个明显的色谱峰,其中8个通过离子阱多级质谱进行了结构推测鉴定,5个通过对照品得到了化合物确证。结论高效液相色谱离子阱质谱是凉粉草化学成分分析鉴定的有效手段。     

中等收入陷阱的国际实证比较及对中国启示

本文通过实证对比跨越和落入中等收入陷阱两类国家在入均GDP达到3000美元到突破1万美元期间经济社会方面的差异及演变过程,给出落入中等收入陷阱国家的判断依据,揭示中等收入陷阱的实质是效率陷阱,发现落入中等收入陷阱的成因主要有教育投入不足、失业率高、消费层次低、金融配置低及贫富差距过大等。同时,对中国落入陷阱的可能性进行判断分析,并就中国如何跨越中等收入陷阱给出一些建议。     

对中国经济发展阶段的探讨——从刘易斯曲线、人口红利、库兹涅茨曲线角度出发

学术界对于中国经济发展阶段是否已经迎来刘易斯拐点,以及中国人口红利拐点何时到来的讨论存在较多的争议.本文从二元经济视角、人口转变视角、收入分配视角分析了刘易斯拐点、人口红利拐点、库兹涅茨转折点之间的关系,由此对中国的经济发展阶段进行了探讨.通过对农村剩余劳动力数量是否存在大幅度下降及农业工资率是否存在大幅度上升的分析,本文认为中国经济并未进入刘易斯拐点;虽然中国面临人口红利的结束,人口转变优于经济发展,但并不意味着中国劳动力的短缺;只要我国实现从人口大国向人力资本强国转变,就会抵消人口红利拐点到来的负面影响.文章最后对中国是否存在陷入“中等收入陷阱”的可能性进行了讨论     

1000MW超超临界机组主汽再热疏水系统设计研究

本文结合国内外1000MW等级超临界机组的设计经验,经分析论证,提出了电厂三大蒸汽管道疏水采用温差信号(蒸汽过热度)来代替负荷信号控制三大蒸汽管道疏水阀的启闭的方案,该方案不仅具有更好的安全可靠性,同时还实现了工程的节能减排。     

教育不平等、收入非平衡与贫困陷阱——对农村教育和农民收入的考察

研究表明,无论是在短期还是长期内,农村居民受教育水平和职业培训的差异是造成收入差距的一个重要因素.同时,教育差距既推动了收入差距的扩大,又可能伴随着收入非平衡增长的扩大而扩大,低收入农户有陷入贫困陷阱的危险,而解决问题的关键是推进农村教育的均衡协调发展.     

Quantitative easing and Japanese bank equity values

One of the primary motivations offered by the Bank of Japan (BOJ) for its quantitative easing program—whereby it maintained a current account balance target in excess of required reserves, effectively pegging short-term interest rates at zero—was to maintain credit extension by the troubled Japanese financial sector. We conduct an event study concerning the anticipated impact of quantitative easing on the Japanese banking sector by examining the impact of the introduction and expansion of the policy on Japanese bank equity values. We find that excess returns of Japanese banks were greater when increases in the BOJ current account balance target were accompanied by “non-standard” expansionary policies, such as raising the ceiling on BOJ purchases of long-term Japanese government bonds. We also provide cross-sectional evidence that suggests that the market perceived that the quantitative easing program would disproportionately benefit financially weaker Japanese banks. J. Japanese Int. Economies 20 (4) (2006) 699–721.     

自然资源与区域经济增长:一个文献综述

自然资源是影响区域经济增长的重要因素,但是一直以来资源问题却没有引起主流经济学界的重视,包含有自然资源因素的增长模型是对区域经济增长模型的扩展。经验数据表明自然资源在某种程度上会挤出物质资本,并影响效率,从而形成区域经济增长过程中的"资源陷阱"现象,西方学者对此做出了理论上的解释。     

Keynesian models of deflation and depression revisited

This paper extends Tobin's [Tobin, J., 1975. Keynesian models of recession and depression. American Economic Review 65, 195–202] Keynesian analysis of deflation to include a range of additional channels through which deflation exacerbates Keynesian unemployment. The paper provides further theoretical reasons why downward price level adjustment may not solve the Keynesian problem. These arguments challenge the received wisdom that Keynes’ General Theory is a special case resting on downwardly rigid prices and nominal wages. This conventional wisdom has led many economists to recommend policies promoting downward flexibility. These policies have created an environment in which deflation is more likely, giving new relevance to Keynesian analysis of deflation.     

New Keynesian dynamics in a low interest rate environment

Recent research has found that the dynamic properties of the New Keynesian model are unorthodox when the nominal interest rate is zero. Improvements in technology and reductions in the labor tax rate lower economic activity and the size of the government purchase output multiplier is very large. This paper provides evidence that these results are not empirically relevant. We show that a prototypical New Keynesian model fit to Japanese data exhibits orthodox dynamics during Japan's episode with zero interest rates. We then demonstrate that this specification is more consistent with outcomes in Japan than alternative specifications that have unorthodox properties.     

数字金融助推我国跨越“中等收入陷阱”

基于中国2011—2019年31个省(区、市)的面板数据,考察数字金融对我国跨越“中等收入陷阱”的影响。结果发现：数字金融能够显著促进我国对“中等收入陷阱”的跨越,尤其强劲地表现在低教育水平、中西部欠发达以及物质资本投资水平较高等地区。同时,在机制检验中发现数字金融还可以通过提高产业结构的合理化水平来赋能我国跨越“中等收入陷阱”。鉴于此,应加快推进“数字中国”建设,提升数字金融发展水平,助力我国跨越“中等收入陷阱”。