中小企业实施搜索引擎营销策略分析

搜索引擎是中小企业的一种有效网络营销手段。目前比较吸引企业的搜索引擎营销模式主要有搜索引擎竞价排名、关键词广告、搜索引擎优化等。中小企业搜索引擎营销策略包括基于搜索引擎的网站优化策略、基于搜索引擎的网站推广策略、基于搜索引擎的广告投放策略、基于搜索引擎的信息收集策略．以及这些策略综合形成的组合。随着搜索引擎市场规模不断扩大并稳步发展,我国搜索引擎用户数量快速增长,用户对搜索引擎高度认可并广泛使用,搜索引擎营销的前景广阔。     

The emergence of hybrid-electric cars: Innovation path creation through co-evolution of supply and demand

Hybrid-electric vehicles have experienced a significant rate of growth in the last 10 years. This is remarkable, since the automotive sector is typically averse to the more radical technological change of engines. The internal combustion engine has been around for more than 100 years after all.In this paper we describe and explain the emergence of electric engines in the automobile market after 1990. We explicate the role of techno-economic mechanisms alongside social and regulatory mechanisms (including the social meaning of an engine). The co-evolutionary analysis is novel in the integrated conception of actor perspectives, feedback effects and competition between products. We find three sources of lock-in through path dependency: from demand, supply as well as the regulatory side. We conclude that automotive engines were significantly locked into a trajectory of internal combustion technology due to techno-economic mechanisms, which produced inertia despite social pressures. The creation of an alternative path, on the other hand, initially stalled. Various stakeholders were unsuccessful in marketing their electric or hybrid-electric vehicles in the 1990s, such as Peugeot/Citroen with various electric models, or Audi with their Duo in 1997. However, after 2000 we find that sustaining efforts of California's Air Resources Board and Toyota were triggering creation of a new innovation path of hybrid-electric engines.     

The Dynamics of Online Purchase Visits: Inertia or Switching?

This paper studies the dynamics of online purchase patterns, focusing on the impact of the channel used on conversion probability, as well as the transition of channel use over time. A novel data set from a major Chinese online travel agency is used for analysis, consisting of four months of data with 24,337 store visits through three types of channels: direct visit, search advertising and referral. Results of a Bayesian multinomial logit model show that the search channel significantly affects consumers’ conversion probability, and show a high degree of inertia in channel use. This finding contrasts sharply with suggestions of previous research that most future purchases will converge to the direct-visit channel.     

8V165柴油机应用组合脉冲转换增压的试验研究

文章通过多方案模拟计算,优化出8V165机的MPC增压方案,并进行了零部件加工和整机试验,结果表明,在所有的运行工况下,柴油机的功率大幅度提高,耗油率和排温也有较大的下降,机械负荷变化不大。通过计算证明增压器的效率有较大幅度的提高。     

MTU16V396SE84潜用柴油机水下性能试验研究

潜用柴油机与一般柴油机相比,在结构和性能方面有很多特殊性。文章对MTU16V396SE84潜用柴油机在水下工作时的高背压起动、背压波动、跌落转速极限值及废气吹除压载水模拟试验四个特有性能进行了试验研究。     

基于规则引擎的土地数据质量检查方法

土地数据业务规则错综复杂,其检查规则常处于不断地更新变化中。目前的土地检查系统中检查规则基本上都是与程序代码绑定,规则变动困难,系统难以重用。为解决这一问题,提出基于规则引擎的土地数据质量检查方法的研究。利用规则学习方法,将方法应用于浙江省基本农田划定内业数据质量检查系统。研究结果表明规则可灵活修改,满足规则变化更新的要求,完成了浙江省90个县的数据质量检查控制。该方法优于检查规则与程序代码绑定的土地检查系统,实现业务与代码相分离,解决系统重用困难的同时提升了检查效率,更适用于未来的生产工作中。     

Forecasting sales using online review and search engine data: A method based on PCA–DSFOA–BPNN

Traditional sales forecasting methods are mainly based on historical sales data, which result in a certain lag. The relationship between sales volume and its influencing factors is intricate and often non-linear. In view of this, we propose a novel product forecasting method using online reviews and search engine data. Firstly, a dictionary-based sentiment analysis method is developed to convert the textual review concerning each attribute of the product into the corresponding sentiment score. And by combining the prospect theory and relevant online review data, sentiment indices in each period are calculated. Subsequently, data of product-related Baidu search words with different lag orders are collected and screened by time difference correlation analysis. Finally, the forecast model, PCA–DSFOA–BPNN, is constructed by combining the principal component analysis (PCA), the back propagation neural network (BPNN), and the improved fruit fly optimization algorithm (DSFOA), in which sentiment indices, Baidu search data, and historical sales volume are input data. Taking the monthly sales forecast of 14 automobile models as a case study, we observe that the proposed forecast method can effectively improve the forecast accuracy with good robustness.     

CFM56-7B发动机防冰系统浅析

本文主要以波音737NG(CFM56-7B)飞机为例,通过对发动机结冰形成原因及危害的介绍,阐述了发动机防冰的重要性,同时对发动机防冰系统的工作原理,相关部件的失效模式做了详细的分析,并针对该系统在航线维修工作中经常发生的故障提出了排故建议。     

基于虚拟样机技术的摩托车发动机减振研究

摩托车行驶时的振动大小不仅影响摩托车的操作稳定性和行驶舒适性,而且严重时会影响驾驶者骑行的安全性。而引起摩托车振动的主要因素是发动机曲柄连杆机构往复运动产生的惯性力和惯性力矩,所以必须针对曲柄连杆设计相应的平衡机构,使发动机实现内部活塞往复运动时的动态平衡。根据某企业的摩托车两缸汽油发动机图纸,本文将虚拟样机技术应用于发动机减振设计过程,通过ADAMS/Engine建模并对其模型的动力学特性进行分析,依据仿真结果优化平衡机构的配置。     

汽车发动机冷却系统设计及稳定性分析与研究

汽车发动机冷却系统是汽车构造中十分重要的组成部分,本文对汽车发动机冷却系统设计及稳定性进行深入的研究分析,具体介绍了汽车发动机冷却系统的特点及工作原理。