泡沫增强聚合物体系配方研究

在分析了聚合物驱提高采收率技术在实际应用中的局限性基础上,提出了采用就地起泡形成泡沫的泡沫增强聚合物体系以减小聚合物沿大通道窜流的问题。为了有效确定该体系的配方,实验中采用了均匀设计实验方法安排实验,并运用DPS数据处理软件对实验数据进行了二次多项式逐步回归处理,找出了影响该体系性能的主要因素。     

基于情感体验的交互式包装设计与评价

包装不仅是商品的载体,也是品牌信息和情感体验的载体,是商品与消费者之间的信息沟通桥梁及商品体验营销的实现手段。以某护肤品包装设计为例,阐述了基于情感体验的本能层、行为层、反思层上的具体设计实践。同时,选取情感互动性、方便性、功能性、效率性、识别性5个评价指标,使用模糊综合评判法构建包装设计评价模型,对两个设计方案进行评价。方案一的评价结果为“良”,方案二的评价结果为“优”。     

高校工薪所得税纳税筹划策略

随着教育事业的发展,高校教职工上缴个人所得税的数量因收入的增长也有很大的提升,教职工也越来越关注纳税筹划的问题,如何在国家税收法律法规的允许范围内合理节税,运用科学的筹划方法减轻高校教职工的负担。本文通过介绍纳税筹划的相关理论,针对不同的工薪种类提出纳税筹划方法。     

不同生产组织模式下农户技术效率研究——基于江苏省桃农的调研数据

基于2016年在江苏省桃主要产区调研所获得的微观数据,运用超越对数随机前沿生产函数模型,测算了不同生产组织模式下桃种植户的技术效率,并深入分析了影响其效率差异的主要因素。结果表明：不同组织模式下桃农生产技术效率存在明显差异,“农户+合作社（协会）”模式下桃农生产技术效率最高,“农户+企业”模式次之,“农户+市场”模式最低,组织化的农业生产方式能够在一定程度上改善要素投入配置,从而带来桃农技术效率的提高。在影响桃农技术效率的各主要因素中,种植规模、种植年限和受教育程度对不同模式下桃农技术效率有显著性影响,但影响方向和程度有所不同;家庭劳动力人口数和参加技术培训次数在“农户+合作社（协会）”模式下表现出显著的负效应。     

价差期权的合约设计、定价与实证分析——基于冶炼价差期权的应用

研究价差期权的合约设计及其定价方法,对于提高我国各类经济实体的风险管理水平以及我国衍生品市场的未来发展具有重要意义.依据我国螺纹钢与铁矿石等冶炼价差的统计特征,借鉴国外价差期权定价方法,对冶炼价差期权的实际价值、理论价格进行了测算,结果表明:在冶炼价差期权中,螺纹钢与铁矿石的价差、钢坯与铁矿石的价差的绝对变化幅度更大,对应的价差期权的实际价值更大,对应的套保需求会更大;与铁矿石有关的价差(螺纹钢与铁矿石、钢坯与铁矿石)期权的套保效果更好.建议先行推出螺纹钢与铁矿石、钢坯与铁矿石这两种冶炼价差期权.     

“农转非”、人力资本回报与收入不平等——基于分位数回归分解的方法

随着中国城镇化进程的推进，越来越多的农村户籍人口实现了身份转换，成为制度认可的新市民。本文利用中国综合社会调查（CGSS）数据发现，即使户口状况相同，"新市民"与"老市民"之间依然存在一定的收入差距。分位数回归及其分解的结果显示，"农转非"人群在劳动力市场上仍受到制度性或非制度性歧视，且歧视程度随着分位数的变化呈现倒U型趋势。同时，"农转非"人群内部也存在较大的差异，歧视降低了自致型"农转非"人群相较于城市原居民的禀赋优势，而外致型"农转非"人群则面临人力资本劣势与就业市场歧视的双重压力。     

Multiphase experiments in practice: A look back

Multiphase experiments are introduced and an overview of their design and analysis as it is currently practised is given via an account of their development since 1955 and a literature survey. Methods that are available for designing and analysing them are outlined, with an emphasis on making explicit the role of the model in their design. The availability of software and its use is described in detail. Overall, while multiphase designs have been applied in areas such as plant breeding, plant pathology, greenhouse experimentation, product storage, gene expression studies, and sensory evaluation, their deployment has been limited.     

社会保险与家庭金融风险资产投资

社会保险是否影响家庭在金融风险资产中的投资决策呢?本文使用两期家庭最优决策模型得到的理论分析结果表明,社会保险不仅能够提高家庭在风险资产中的投资广度和深度,而且对于不确定性更大、风险承受更强家庭的影响更为显著.基于省级层面得到的宏观实证检验结果和基于2011年家庭金融调查数据得到家庭层面的微观实证检验结果都支持了上述理论结论.本文的发现对于协调社会保险发展和建立多层级金融市场具有很强的政策意义.     

A Bayesian sequential design with binary outcome

Several researchers have proposed solutions to control type I error rate in sequential designs. The use of Bayesian sequential design becomes more common; however, these designs are subject to inflation of the type I error rate. We propose a Bayesian sequential design for binary outcome using an alpha‐spending function to control the overall type I error rate. Algorithms are presented for calculating critical values and power for the proposed designs. We also propose a new stopping rule for futility. Sensitivity analysis is implemented for assessing the effects of varying the parameters of the prior distribution and maximum total sample size on critical values. Alpha‐spending functions are compared using power and actual sample size through simulations. Further simulations show that, when total sample size is fixed, the proposed design has greater power than the traditional Bayesian sequential design, which sets equal stopping bounds at all interim analyses. We also find that the proposed design with the new stopping for futility rule results in greater power and can stop earlier with a smaller actual sample size, compared with the traditional stopping rule for futility when all other conditions are held constant. Finally, we apply the proposed method to a real data set and compare the results with traditional designs.     

An access network design problem with end-to-end QoS constraints

In this paper, we present an access network design problem with end-to-end quality of service (QoS) requirement. The problem can be conceptualized as a two-level hierarchical location-allocation problem on the tree topology with nonlinear side constraints. The objective function of the nonlinear mixed integer programming model minimizes the total cost of switch and fiber cable, while satisfying demand within the prescribed level of QoS. By exploiting the inherent structure of the nonlinear QoS constraints, we develop linearization techniques for finding an optimal solution. Also, we devise an effective exact optimal algorithm within the context of disjunctive constraint generation. We present promising computational results that demonstrate the effectiveness of the proposed solution procedure.