加快科技创新提升福建民营经济初探

加快科技创新,提升福建民营经济对于建设海峡西岸经济区具有重要意义。通过选择R&D水平与专利授权量两个科技创新的主要因素,结合福建实际,对科技创新与民营经济发展进行相关性分析,具体分析当前制约福建民营经济科技创新的主要因素及其深层原因,从而探讨新时期福建民营企业科技创新、提升核心竞争力的模式选择,并提出加快科技创新、提升福建民营经济的基本思路。福建省自然科学基金软科学重点项目“加快科技创新提升福建民营经济相关问题研究”[2006R0038的阶段性成

The single pulse thermal effect mechanism of micro-EDM

为了解微能量单脉冲放电加工原理,文中从微细电火花单脉冲放电加工具有放电时间短,放电通道半径小,能量密度高等特点入手,从单脉冲热作用模型的放电通道半径和能量分配系数方面对当前电火花单脉冲蚀出模型进行改进。建立了时变放电通道的热作用模型,并验证了模型的正确性,提出了单脉冲热作用模型中能量分配到工件表面的百分比系数随着放电参数的变化而变化的规律,为微细电火花的广泛应用奠定基础。The single pulse micro electric discharge machining( micro-EDM) has the characteristics of short discharge time,small discharge channel radius,high energy density,etc. Considering these characteristics,the EDM single pulse erosion model is improved in plasma channel radius and energy distribution coefficient of the single pulse thermal effect model,to establish the thermal effect model of micro-EDM machining. The correctness of the model is verified by a reliable experimental method,which lays a foundation for the wide application of micro-EDM.贵州省教育厅基金项目(5392

模拟水、氮脉冲变化对两种荒漠一年生植物生长和物种竞争的影响

Water in desert areas is the most important factor limiting plant growth. Innatural conditions, the availability of moisture and nitrogen is dependent on thedynamic changes in the environment, the fluctuation of precipitation and resourcepulse greatly impact the germination, individual growth and reproduction of differentdesert plants. Spring annual plants, also called ephemerals, and summer annual plantshave significant different water and nutrient use efficiency. Therefore, we infer thatthe seasonal variation of water and N availability will change the growth dynamicsand interspecific relationship of these two different life forms of plants, and it willalso affect their relationship in community phenology. This study examined anephemeral (Malcolmia Africana) plant’s characteristics in terms of floweringphenology, individual growth, biomass distribution and interspecific competition withan annual grass specie known as Descuminia Sophia with a long life cycle response toseasonal nitrogen availability. Plants received the same amount of water in threedifferent patterns according to the real water and N deposition in study area. The mainresults are as follows:Nitrogen application patterns have a significant effect on the process of M.african’s flowering phenology with a typical single-peak curve under the even modeland spring-dominated model, and a trend of two-peak curve under summer-dominatedmodel. The final plant height of M. African under spring-dominated model is thehighest in three treatments in individual growth.Different water application patterns significantly changed the flowering curve ofthe flowering grain. Compared to the average model of water addition, the index andthe single-peak water patterns make the flowering peak in advance. Compared to theindividual growth environment, under the competition with D. sophia, the ratio offlowering of M. africana changed a lot in different time. The flowering of M. Africanaunder the average water pattern is more dispersed in individual growth environmentbut more concentrated in intergrowth environment.The competition for water is more intense in individual growth environment thanthat in intergrowth environment. The M. africana is sensitive to precipitation and itcan use the short-term sufficient water to grow but with lower drought resilience thanD. sophia with the longer life history. Under the background of increasing spatial-temporal distribution of precipitation in arid area, the amount and pattern ofprecipitation variability will make an important effect on desert plants’ growth,phenology and even community composition

加快科技创新提升福建民营经济竞争力——模式选择、机制设计与对策措施

新时期加快科技创新,促进福建民营经济发展,对于建设海峡西岸经济区具有重要意义。文章针对福建省民营企业的实际,首先探讨加快民营企业科技创新,提升核心竞争力的模式选择;进而从产权制度、组织制度、管理制度以及用人机制等层面,设计加快民营企业科技创新的新机制;最后,配合模式选择和机制设计,提出加快福建省民营经济科技创新的对策措施。福建省自然科学基金软科学重点项目《加快科技创新,提升福建民营经济相关问题研究》(项目编号:2006R0038)的阶段性成