市外旅行商行为与重庆旅游地营销匹配度探讨——基于网络调查视角

旅行商是连接旅游者和旅游地的桥梁。虽然旅行商与旅游地之间形成密不可分的利益关系,但在现实的旅行商和旅游地关系中,却存在较多的问题:个别大型旅行商"绑架"要挟旅游地,旅游地营销战略与旅行商推荐线路性质不匹配等。以压力-状态-响应理论和刺激-反映理论为指导,选取2010年和2011年国家旅游局发布的100强上榜旅行商中的重庆旅游地以外的60家旅行商为样本,通过网络调查方法,获取其推介的重庆旅游线路的相关情况,并加以分析整理,再结合重庆市旅游营销的具体实践,探求二者之间的匹配响应关系,得出市外旅行商和重庆旅游地营销之间存在匹配响应较低的结论,其结果是大大降低重庆旅游营销效果。最后,文章给出旅游地和旅行商之间匹配关系调整的一些对策,以期对重庆旅游营销有所裨益。     

基于模糊多属性群决策的维护方式选择研究

维护方式选择是维护管理中的重要工作之一,合理的维护方式既能达到保障设备的稳定运行,又能同时兼顾其它各个方面的要求.由于对维护方式的评价涉及多个部门、人员和属性,有些指标只是一个模糊的概念,因而采用模糊多属性群决策的方法对维护方式进行优先抉择.本文结合A公司的设备维护方式选择问题,尝试使用模糊多属性群决策折衷算法求解最佳...     

用神经网络对开式冷挤压极限变形程度的预测

给出了基于 BP网络的极限变形程度预测的分析方法 ,得到了开式冷挤压εmax神经网络计算结果 ,与实验结果比较 ,其精度较高 ,证明了神经网络模型在开式冷挤压工艺中应用的可行性。     

集成运放的一些使用技巧

目前集成技术飞速发展且集成芯片已被广泛应用 ,为了充分利用集成在一个芯片上的两个运算放大器性能互相匹配的特点 ,本文从三个方面介绍了合理使用集成运算放大器的几种技巧。其中 ,利用集成在一个硅片上的两个运算放大器的输入失调电压极其温度漂移相互补偿的原理 ,组成了失调电压极低的运算放大器 ;根据输入电阻的自举扩展原理 ,利用集成在一个硅片上的两个运算放大器组成的反向比例运算放大器具有很高的输入电阻和较高的电压放大倍数 ;根据差动放大电路的输出电压方式 ,利用集成在一个硅片上的两个运算放大器组成的差动输出运算放大器 ,最大线性输出电压范围比一个集成运算放大器的最大线形输出电压范围大一倍。且适用于不接地负载。     

Impacts of sustainability certification on farm income: Evidence from small-scale specialty green tea farmers in Vietnam

Sustainability certification for small-scale farms has gained considerable momentum in developing countries. However, evidence on the economic benefits of certification schemes in the context of domestically consumed foods and beverages is scarce. This paper addresses this gap by evaluating the impacts of sustainability standards on the selling prices, sales, costs and net income of small-scale specialty green tea farming in Vietnam. We analyze original survey data on 401 smallholder green tea farmers and employ propensity score matching to mitigate self-selection bias. Our estimates reveal that certified green tea producers are able to obtain a higher average selling price and sales value. In addition, although certification leads to a dramatic increase in the costs of hired labor, net farm income is still significantly improved.     

智能安全气囊高坠防护空调服的设计研究

施工现场智能安全防护空调服属人体安全防护范畴,通过将安全气囊、电子控制元件、气瓶、导通装置嵌入到施工安全马甲中,设计了SHW12、SHW13、SHW22三款防护服并对囊袋触发灵敏度,囊袋的厚度、重量、断裂强度、断裂伸长率、撕裂强力、燃烧速率等性能进行检测。同时将制冷系统巧妙地集成在防护服内,在施工现场进行穿戴试验,找出控制单元中算法模块参数进行优化,并对加速度、角速度的六轴采集波形进行叠加合成经滤波器处理。通过一系列的试验证明,防护服具有良好的缓冲消能作用,对意外事故发生时的作业人员具有很好的保护作用。     

Searching for empirical linkages between demographic structure and economic growth

Demographic structure could affect economic growth through many channels. However, little is known about how demographic structure affects economic growth since no study has examined an extensive collection of channels through which demographic structure could affect economic growth in a single context. This paper overcomes this limitation by examining 45 potential mediating variables between demographic structure and economic growth. A causal search algorithm is used to identify channels through which demographic structure affects economic growth. Our results suggest that demographic structure affects economic growth differently between developed and developing countries. For developed countries, we find that an increase in the share of middle-aged workers has a positive effect on economic growth through institutions, investment and education channels. On the other hand, an increase in the share of the senior population has a negative effect on economic growth through institutions and investment channels. For developing countries, we find (but with weak evidence) that an increase in the share of young workers has a negative effect on economic growth through investment, financial market development and trade channels.     

匹配式管理模式在汽车城规划建设中的探索与应用

针对两江国际汽车城规划建设中招商引资困难的问题,结合两江国际汽车城的实际情况、资源条件以及发展趋势,设计了匹配式管理模式.在阐述匹配式管理模式内涵基础上,对匹配式管理体系的组成要素、框架结构、匹配关系等进行了分析,并对该管理模式在实际中的应用效果及推广意义进行了总结.     

基于作业过程的园林绿化项目资源清单模型

结合生产要素六元理论，对园林绿化项目资源进行界定；以作业过程为信息关联节点，通过施工工序分解和资源特征匹配，构造园林绿化项目的“产出-作业”分配关系描述矩阵和“作业-资源”消耗关系描述矩阵。XX科技园林绿化企业的应用结果表明，项目资源清单模型解决了目前园林绿化企业资源信息分离使用的现状，是企业快速构建项目资源计划表、项目施工方案以及快速估算项目成本等的基础数据信息。     

Are EU trade preferences really effective? An impact evaluation assessment of the Southern Mediterranean Countries’ case

This work assesses the causal impact of the EU trade preferences granted to the Southern Mediterranean Countries (SMCs) in agriculture and fishery products over the period 2004–2014. It overcomes some of the weaknesses of previous assessments and presents several methodological improvements. Firstly, it relies on a continuous treatment – i.e. preferential margins – to capture the ‘average treatment effect’ of trade preferences, rather than on a binary treatment based on dummy variables. Secondly, it uses highly disaggregated data at sectoral level in order to evaluate properly the preferential treatment. Thirdly, it applies a non-parametric matching technique for continuous treatment – specifically, a generalized propensity score matching. The results show, on the one hand, that the impact of the EU preferences is positive and significant on SMCs trade and is better evaluated using impact evaluation techniques. On the other hand, they demonstrate that the relationship between preferences and trade flows is asymmetric and warn against the risk of providing too much of a good thing. These results raise important issues for policy-making. First, they demonstrate that raising the level of preferences is not the solution to foster the SMCs trade towards EU. Second, that the policy-makers should put more emphasis on complementary factors other than trade barriers.