Regional labor markets in Finland: Adjustment to total versus region-specific shocks

This article analyses regional labor market adjustment in the Finnish provinces during 1976–2000. We investigate the inter-relations of employment, unemployment, labor force participation, and migration to see how a change in region-specific and total labor demand is adjusted. The analysis reveals that region-specific labor demand shocks adjust mainly via participation, whereas total shocks are adjusted by unemployment. The region-specific component of labor demand shock has shorter-lived effects on unemployment and participation, but its effect on employment is permanent. Conversely, total shocks leave no permanent effect. Migration is more important in the region-specific case where, after a few years, it acquires a large role in the adjustment process.     

PVC糊状树脂交联改性新方法

向PVC糊状树脂中添加2-二置换氨基-4、6-二噻茂仲三嗪或其金属盐及水滑石等添加剂进行交联改性,可显著降低其溶胶粘度,提高透明性,改善加工耐热性。     

核心路由器的发展趋势分析与探讨

对核心路由器硬件结构的发展过程进行了分析,从万兆线速处理能力支持、IPV6支持、MPLS支持、可靠性设计等方面介绍了核心路由器的业务支持能力,并对其稳定性发展进行了阐述,为网络的可靠运行提供电信级的稳定性保证。     

Numerical studies on air flow around a cube

In this paper, air approach flow moving towards a cube will be studied using computational fluid dynamics (CFD). The Reynolds Averaging of Navier-Stokes (RANS) equation types of k-ε turbulence model are used. Some RANS predicted results are compared with different upstream air speeds. Flow separation at the corner above the top of the cube, level of separation and reattachment are investigated. Reference is made to the experimental data on wind tunnels reported in the literature.A method similar to ‘recirculation bubble promoter’ is used for different approach flow speed distributions. Problems encountered in numerical simulations due to the sharp corner are discussed with a view to obtaining better prediction on recirculation flow in regions above the top of the cube. Correlations between the turbulent kinetic energy above the cube and the recirculation bubble size are derived for different distributions of approach flow speed.By limiting the longitudinal velocities in the first cell adjacent to the sharp edge of the cube or rib, and making good use of the wall functions at the intersection cells of the velocity components, positions of maximum turbulent kinetic energy and the flow separation and reattachment can be predicted by a standard k-ε model. The results agree with those obtained in the experiments.     

An experimental investigation into the cutting deformation mode of AA6061-T6 round extrusions

Experimental testing was completed to study the load/displacement and energy-absorption characteristics of AA6061-T6 round extrusions under a cutting deformation mode. A heat-treated 4140 steel alloy cutter was designed and manufactured with four cutting blades of approximate average thickness of 1.18 mm to penetrate through the round AA6061-T6 extrusions. The specimens utilized in this experimental investigation were tubes of lengths 200 and 300 mm with a nominal wall thickness of 3.175 and an external diameter of 50.8 mm. Results from the experimental tests showed that the cutting deformation mode exhibited a high average crush force efficiency of 0.95 compared to average values of 0.66 and 0.20 for progressive folding and global bending deformation modes, respectively. An almost constant cutting force was observed during the cutting deformation process. For both the 200 and 300 mm length tubes, the average total energy absorption was observed to be 6.11 kJ, which was independent of tube length. The mean steady-state cutting force observed was 45.58 kN and a fair correspondence was found between the theoretical predictions and the experimental results.     

细颗粒LLM-105的制备及其热性能

采用溶剂-非溶剂重结晶技术制备了类球形和立方体结构两种不同晶形的细颗粒2,6-二氨基-3,5-二硝基吡嗪-1-氧化物(LLM-105),重均平均粒径D50分别为2.750 μm和6.206 μm,撞击感度为35.5 cm和34.7 cm.采用热重-微商热重(TG-DTG)和差示扫描量热法(DSC)对LLM-105进行了...     

内蒙古敖仑花斑岩钼矿床脉状岩枝的岩相学特征及地质意义

脉状岩枝与单向固结结构(UST)一样,是一种特殊的岩浆—热液过渡结构,其内的原生包裹体可能记录了初始流体出溶的信息。文章在内蒙古敖仑花斑岩钼矿中首次发现了脉状岩枝的存在。岩相学特征显示,脉状岩枝可分为3类:(1)富流体脉状岩枝,(2)富岩浆脉状岩枝,(3)细晶岩脉。脉状岩枝的特征表明,初始流体可能是岩浆分异后残余硅酸盐熔体和流体共存的岩浆—热液过渡性流体,其独特的结构特征反映成矿流体是深部岩浆房流体出溶的产物,并可能在敖仑花岩体的深部存在一个大型的岩基。     

DAATO_(3.5)与CMDB推进剂组分的相互作用及相容性

采用差示扫描量热法(DSC)和真空安定性实验(VST),对N-氧化3'3-偶氮双(6-氨基-1,2,4,5-四嗪)(DAATO_(3.5))与复合改性双基(CMDB)推进剂常用单组分之间的相互作用和相容性进行了研究。采用70℃推进剂固化实验,考察了DAATO_(3.5)与CMDB推进剂药浆多组分混合体系的相容性。DSC研究结果表明,DAATO_(3.5)与硝化棉(NC)、硝化甘油(NG)、奥克托今(HMX)、3,4-二硝基呋咱基氧化呋咱(DNTF)、铝粉(Al)、吉纳(DINA)、炭黑(C.B)和1,3-二甲基-1,3-二苯基脲(C2)之间没有明显的相互作用,相容性较好。DAATO_(3.5)与黑索今(RDX)和六硝基六氮杂异戊兹烷(CL-20)存在较为明显的相互作用;与间苯二酚(Res)之间存在强烈的相互作用,Res对DAATO_(3.5)的峰温没有影响但会显著改变DAATO_(3.5)的分解峰型;高氯酸铵(AP)对DAATO_(3.5)的分解峰温没有明显的影响;DAATO_(3.5)可使AP的起始分解温度从310℃降至275℃,并使AP的低温分解峰和高温分解峰合并成一个分解单峰,分解峰温较AP的高温分解峰温下降52.9℃。VST实验结果表明,DAATO_(3.5)与AP相容,与RDX属于中等反应,与Res不相容。推进剂固化实验结果表明,DAATO_(3.5)与CMDB推进剂多组分混合体系在70℃实际工艺条件下可以安全固化,形成的含DAATO_(3.5)的CMDB推进剂均匀致密,表明DAATO_(3.5)可应用于CMDB推进剂中。     

微观移动IPv6技术

采用微观移动IPv6技术,在移动IP中引入层的概念.通过层次的划分,将网络分成不同的域,将移动结点的切换限制在小范围内.其协议含HAWII协议、层次移动IP和区域移动IP协议等.     

一种基于H6型并网逆变器调制策略的研究

针对传统H6型单相非隔离光伏并网逆变器只能工作在单位功率因数逆变状态而无法进行无功调节的问题,在分析了该拓扑逆变器电压和电流矢量关系的基础上,提出了一种新型的H6型单相光伏并网逆变器调制策略,该调制策略通过当在电网电压的正半周内,在传统调制策略的基础上采用开关管S5与S1互补导通的方式来实现无功传输。最后,通过仿真和实验验证了所提出控制策略的有效性。