钒氮合金在双推板窑内的制备过程是一步氮化还原与传热过程,生产周期较长,能耗较高.为了有效地降低生产能耗,首次对推板窑生产氮化钒过程进行了温度场模拟尝试,这对优化设备具有一定的指导作用.本工作通过对双推板窑窑腔建立三维传热模型,采用ANSYS Workbench仿真平台对制备钒氮合金的典型加热段进行数值模拟,获得了不同加热段料球切片的温度场分布.通过对模拟结果进行验证,进一步采取提高升温速率,优化推板窑运行速度,达到缩短生产周期的目的.优化结果显示,在原有热工制度不变的基础上,优化后料球通过主窑的时间缩短了108 min;优化后产量在原工况基础上增加了6.45％;优化后的吨耗电量降低到了优化前的93.94％.

This paper mainly studied the operation strategy for subway VAC system during transition seasons. Two modes including WF-AC (Whole Fresh air- Air Conditioning) mode and B/E-V (Back/Exhausted fan-Ventilation) mode were selected based on energy saving principle. In order to decide the optimal operation mode, the calculation method of “switching temperature” was proposed. The main influencing factors of the switching condition include indoor cooling load, COP of the chilled-water-system, temperature difference of the supply air, efficiency of fan and the resistance of air duct. Also, the transfer temperature diagram is provided based on proposed calculation method, which is suitable for engineering use. The aim of this study is to regulate the operation mode and to promote energy saving in subway station.

本文利用MM5大气模型和HYCOM海洋环流模型,模拟研究了2002年飓风Isidore过境墨西哥湾后上层海洋的响应以及墨西哥湾常态水(Gulf common water,GCW)和湾流(Loop Current,LC)对飓风Isidore的不同响应.飓风Isidore穿过GCW区后,导致海表最大降温接近5℃,混合层深度由30m加深到70m,上层海洋损失热量较多,上层海洋的结构恢复时间较长;但在LC区,由于亚热带持续不断的高温、高速水体输运,该区域水体具有较深的混合层和较大的能量,虽然在飓风过程中损失了较多的热量,但仅造成2℃的海表面降温,上层海洋的结构恢复时间较短;此外,飓风过境后,在上层海洋激发近惯性震荡,在LC区可导致1.0m/s近惯性震荡流,能量可传播至1500m以深,但在GCW区,由于较浅的上混合层、较弱的流速和较强的层化结构,近惯性震荡运动影响深度较浅.

In order to improve the charging efficiency of photovoltaic power generation, Photovoltaic controller adopts STM32F103 as the main chip, Hardware IGBT power (IKW40N120H3), Three-phase alternating BUCK/BOOST circuit in parallel, The variable step disturbance observation Maximum Power Point Tracking (MPPT), Combining the open circuit voltage method and average sliding filter AD conversion technology, Through 3 kW photovoltaic controller product certificate, On the charging control for the stable operation, Implements the disturbance of the MPPT algorithm optimization.

通过对岩心、普通薄片、铸体薄片、扫描电镜、高压压汞等实验数据的分析,对库车坳陷克拉苏构造带克深5井区巴什基奇克组不同应力段岩石学特征、储集空间类型、物性以及孔隙结构特征展开对比分析.不同应力段岩性相似,均以方解石胶结的岩屑长石砂岩为主,但张性应力段碎屑颗粒以点状和点-线状接触为主,过渡段碎屑颗粒以线状接触为主,压扭应力段碎屑颗粒呈定向排列;不同应力段储集层基质孔隙类型存在差异,从张性应力段到压扭应力段,储集层平均孔隙度逐渐变小,平均渗透率则逐渐变大.不同应力段孔隙结构存在差异,张性应力段储集层毛细管压力曲线以Ⅰ类和Ⅱ类为主,排驱压力、中值压力低,进汞饱和度高,平均孔喉半径大,喉道均匀,连通性好;而压扭应力段储集层毛细管压力曲线以Ⅳ类为主,平均孔喉半径小,孔喉分选、连通性差,排驱压力、中值压力受微裂缝影响,分布不规律;过渡段储集层特征基本介于张性应力段和压扭应力段之间.研究结果明确了克深5井区储集层垂向分层性,改变了按岩性段对储集层特征展开对比分析的传统方法.

Intellectual capital is increasingly being recognized as a driving force for the prosperity of economy and corporations. This paper applies the value-added intellectual coefficient (VAIC) model to investigate the link between components of intellectual capital and corporate performance in three industry sectors in China. We find that (1) the material capital employed efficiency has a positive effect on performance in both manufacturing and real estate sectors; (2) the human capital efficiency has a positive effect on performance in the manufacturing sector but not in the real estate or the IT sectors; (3) the structure capital efficiency has non-significant effect on performance in any of the three industry sectors.