高效液相色谱法同时测定食用油中7种抗氧化剂的方法研究

本研究利用高效液相色谱同时测定食用油中没食子酸丙酯(PG)、没食子酸月桂酯(DG)、没食子酸辛酯(OG)、叔丁基对苯二酚(TBHQ)、叔丁基对羟基茴香醚(BHA)、2,6-二叔丁基对甲基苯酚(BHT)、2,6-二叔丁基-4-羟甲基苯酚(Ionox-100)7种抗氧化剂的测定方法,样品中的抗氧化剂经正己烷溶解、乙腈萃取后,经C18柱分离,乙腈-1.5%乙酸溶液体系为流动相进行梯度洗脱,紫外检测器检测,外标法定量。选择线性范围在1~100mg/L,结果表明7种抗氧化剂呈良好的线性关系,相关系数r大于0.999,方法的测定低限为0.8~2.0mg/kg,回收率在89.3%~110.1%,变异系数在1.5%~4.9%。该方法准确、快速、重现性好,可用于大批量食用油检测中7种抗氧化剂的定量分析。     

Does oligopsony power matter in price support policy design? Empirical evidence from the Thai Jasmine rice market

In the oligopsony market, farmers may receive low prices and policy analysis assuming perfect competition can yield serious bias results. In this paper, we estimate oligopsony power between processors and farmers and evaluate the welfare impact of the paddy pledging program (PPP), a generous price support program in the Thai Jasmine rice market, with an imperfect competition model. We develop a model that consists of rice supply equation and derived demand equation. We then simultaneously estimate these equations using system estimation methods to recover oligopsony power parameters. Finally, we use these parameters to assess the welfare impact of the price support program. Using annual panel data running from crop marketing year 2001/2002–2015/2016 and exploiting the institutional feature of the PPP, we find strong evidence of some oligopsony power, a moderate level of oligopsony price distortion, and a negative relationship between price support and oligopsony power. We also find that the PPP is inefficient but effective in income redistribution. Moreover, the program benefits both farmers and consumers. With better policymaking decisions, the PPP can be efficient by setting a suitable support price. Therefore, our results show that in the case of the Thai Jasmine rice market, the generally accepted “wisdom” about agricultural price support policy does not necessarily hold, and price support can be designed to improve the efficiency of the market.     

区片价制度对征地主体利益分配的影响

研究目的:评估区片价制度对征地补偿中国家和集体间利益分配的影响。研究方法:资产选择理论、裁定条件模型、实证分析。研究结果:(1)区片价制度提高了村集体在征地补偿过程中的相对利益,但这种优势随地租上升而递减。(2)区片价制度有利于地区间公平,但高产出的土地所在村集体利益相对受损。研究结论:作为从计划向市场的过渡形式,区片价制度对利益分配的改善意义重大,但要最终实现不同征地主体间的利益优化,需完成向市场化的转变。     

输油管线泄漏实时监测报警系统应用效果测试与分析

通过对应用于胜利石油田的三套“输油管线泄漏实时监测报警系统”性能指标分析，确立了其评价技术性能的关键参数，即报警灵敏度、报警时间、定位精度和报警率，制定了实际应用效果的测试方案，并进行了现场测试。对报警系统进行了技术分析，并提出了改进措施与方向。     

采油厂流量仪表选型探讨

流量计的选型直接影响到流量计量的准确度。根据被测介质性质的不同、流量大小和具体的现场条件选择合适的计量仪表,既降低了计量误差,又做到经济耐用,满足了现场计量需要。     

“限地价,竞配建”土地出让方式的理论分析与实证研究

研究目的:对中国土地市场中新兴的"限地价,竞配建"挂牌方式进行研究,并与"定配建,竞地价"招标方式相对比。研究方法:建立有限价的两阶段拍卖和封闭式拍卖模型,分析开发商和地方政府的最优策略。研究结果:(1)在限制拍卖起始价的前提下,结合"溢价率超50%需上报"的规定,"限地价,竞配建"方式可有效控制地价并促进保障房的开发;(2)"限地价,竞配建"挂牌方式可通过相应的招标方式实现,但并不同于"定配建,竞地价"的招标方式。研究结论:"限地价,竞配建"挂牌方式和"定配建,竞地价"招标方式是促进保障房建设的重要手段。地方政府若希望落实保障房建设,挂牌方式更好;若希望降低地价,招标方式更好。     

How well do conservation auctions perform in achieving landscape‐level outcomes? A comparison of auction formats and bid selection criteria

This paper studies the performance of auction design features regarding pricing mechanisms and bid selection criteria for securing wildlife zones across different holdings. We compare two pricing mechanisms: a discriminatory‐price auction and a uniform‐price ascending auction, and four bid selection criteria on the basis of: total bid, bid‐per‐value ratio, bid‐per‐area ratio and a mixed criterion where bids are formed on the basis of cost but they are selected based on the bid‐per‐value ratio. We develop a best‐response group‐bidding model for a discriminatory‐price auction where bidders form optimal group bids for individual wildlife zones. In the uniform‐price ascending auction, individual landholders respond to prices, which are successively raised by the auctioneer and whenever all the landholders from a single zone agree to participate (i.e. the first zone is formed), the auction stops. Based on numerical simulations using a bio‐economic model of malleefowl conservation, we observe that the discriminatory‐price auction is more cost‐effective than the uniform‐price ascending auction. However, the budgetary cost‐effectiveness of a discriminatory‐price auction is sensitive to bidder uncertainty about the number of competing bidder groups and the highest cost of establishing a wildlife zone among these groups. In terms of bid selection, the mixed bid selection criterion performs best. We discuss the policy implications of these findings.     

海域使用金评估问题研究

论文以海域使用金评估为研究对象,在分析海域使用金与海域使用权关系的基础上,论述了海域使用权价格体系由,迚而探讨了海域使用权价格评估的方法。在此基础上,阐释了海域使用金评估应分为基本不改变海域自然属性用海类型、一定程度上可能会改变海域自然属性用海类型及一次性基本完全改变海域自然属性用海类型三种情况设定基本思路,以期丰富我国海域使用金评估的理论与方法,为今后海域使用金评估研究提供借鉴参考。     

运用经济杠杆促进错峰调荷——安徽省峰谷电价分析

阐述了安徽省峰谷电价的实施背景、方案的主要内容和创新特点,2004年上半年的实际执行情况及取得的效果。结合安徽省实际情况,对下一阶段如何优化峰谷电价方案、进一步发挥价格杠杆作用提出了建议。     

从公司治理角度探讨国有商业银行资金管理机制再造

建立长效的资金管理机制,对于完善商业银行内部运行机制,优化商业银行公司治理结构具有重要的现实意义.本文将国有商业银行资金管理问题置于公司治理的框架下考虑,分析了我国国有商业银行存在组织架构未能理顺、管理方式和手段落后、资金风险管理水平不高和内部转移价格体制不合理等问题.据此,提出重构资金管理新机制的基本思路,即科学设计资金营运组织架构、提高风险管理水平、全面实行资金集中管理及建立完整有效的内部资金转移价格体系,并指出对于内部资金转移价格的定价可先采取实际成本率和收益率法,再过渡到半市场化法,最终实现市场化法的定价思路.