暂态稳定控制中异地数据同步采集的实现

暂态稳定控制中需要采集全电网的实时数据,因而引入GPS信号进行异地测量的同步。文章以华中电网区域稳定控制装置为例,详细介绍了GPS时间信号的接收流程,GPS秒脉冲控制下的异地同步采样,以及CPU之间通过双口RAM进行数据交换的硬件接口和存放格式。实践证明该装置具有较高的可靠性。     

芝麻饼粕及其在烟草上应用研究现状

概述了芝麻饼粕的有效营养成分及其作为有机肥的加工方法,介绍了芝麻饼粕在烟草生产上的应用效果。并就进一步促进芝麻饼粕在烟草上的应用提出了建议,以期为烟叶生产过程中科学使用芝麻饼粕提供参考资料。     

Adsorption of carbon dioxide by coconut activated carbon modified with Cu/Ce

A series of the coconut activated carbons(CAC) based absorbents modified with Cu and Ce(Cu/CAC,Cu/Ce/CAC) were prepared by impregnation technology for carbon dioxide capture.The adsocrption equilibriums of CO2 on Cu/CAC and Cu/Ce/CAC were measured.The results showed that the adsorption capacity of CO2 onto the activated carbon modified with Cu/Ce increased with the decreasing temperature in the same pressure.The adsorption capacity of CO2 on Cu/CAC was higher than that of the blank CAC,and compared with the Cu/CAC,the adsorption capacity of CO2 of Cu/Ce/CAC with the mass ratio of Cu/Ce=30 was improved at 298 and 303 K.In addition,the adsorption equilibrium data for CO2 at various temperatures was fitted to Langmuir,Freundlich and D-R isotherm models.It was found that the D-R equation was the best model for fitting the adsorption data on Cu/Ce/CAC at different temperatures.     

航天继电器多余物自动检测系统的振动台驱动器设计

完成了一种航天继电器多余物自动检测系统振动台驱动器的设计。该驱动器采用C8051F020单片机为核心处理模块,CPLD为逻辑辅助器件,能够产生频率、幅值可调的正弦振动信号及脉冲冲击信号驱动振动台执行振动和冲击动作;通过实时、高精度检测加速度,采用PI算法实现了振动加速度无静差闭环控制。实验表明,驱动器能够满足航天继电器多余物自动检测系统的要求。     

浅析影响水泥混凝土强度的因素

本文通过理论分析从水泥、水灰比、粗集料、细集料、混凝土工艺、混凝土施工技术等几个方面简要阐述影响水泥混凝土强度的几个主要因素,为水泥混凝土结构的设计、施工及试验分析提供一些思路。     

套筒灌浆搭接连接的L型预制剪力墙抗震试验

为研究套筒灌浆搭接连接的L型预制剪力墙的抗震性能,进行了1片现浇墙和2片竖向钢筋采用Ⅰ型、Ⅱ型套筒灌浆搭接接头(简称APC接头)连接的预制墙拟静力试验,研究了试件的破坏形式、滞回性能、特征荷载、变形、钢筋和套筒应变等。结果表明：预制墙裂缝开展情况与现浇墙基本一致,破坏形式为弯剪破坏;现浇墙破坏出现在边缘墙脚处,而预制墙底部由于套筒约束,薄弱截面上移,破坏时套筒上方混凝土压碎,钢筋压屈;当现浇和预制试件墙体底部箍筋、水平分布钢筋加密时,采用Ⅰ型接头连接的预制墙的开裂、屈服、峰值荷载,刚度,延性和耗能能力与现浇墙相当,采用Ⅱ型接头连接的预制墙的各项指标均优于现浇墙;两种接头在预制墙中均能有效传递钢筋应力,套筒在加载过程中基本处于弹性状态;由于APC接头刚度大,预制墙最大平面外位移绝对值小于现浇墙,但预制试件由于水平接缝影响,平面外扭转出现损伤变形累积。     

薄壁药盒成形工艺与模具设计

分析了薄壁药盒的成形工艺,对其中的关键工序,采用双拉伸一次拉伸成形。对斜楔及内外滑块同时压出18个凹面体的模具结构和模具主要零件的设计作了介绍。     

Characterization of Metal Oxide-modified Walnut-shell Activated Carbon and Its Application for Phosphine Adsorption: Equilibrium,Regeneration, and Mechanism Studies

We prepared a kind of metal oxide-modified walnut-shell activated carbon(MWAC) by KOH chemical activation method and used for PH_3 adsorption removal. Meanwhile, the PH_3 adsorption equilibrium was investigated experimentally and fitted by the Toth equation, and the isosteric heat of PH_3 adsorption was calculated by the Clausius-Clapeyron Equation. The exhausted MWAC was regenerated by water washing and air drying. Moreover, the properties of five different samples were characterized by N_2 adsorption isotherm, SEM/EDS, XPS, and FTIR. The results showed that the maximum PH_3 equilibrium adsorption capacity was 595.56 mg/g. The MWAC had an energetically heterogeneous surface due to values of isosteric heat of adsorption ranging from 43 to 90 kJ/mol. The regeneration method provided an effective way for both adsorption species recycling and exhausted carbon regeneration. The high removal efficiency and big equilibrium adsorption capacity for PH_3 adsorption on the MWAC were related to its large surface area and high oxidation activity in PH_3 adsorption-oxidation to H_3 PO_4 and P_2 O_5. Furthermore, a possible PH_3 adsorption mechanism was proposed.     

ICP-AES法测定钆镁合金中钆含量

提出采用电感耦合等离子体原子发射光谱法(ICP-AES)测定钆镁合金中钆的含量。用盐酸溶解样品,溶液稀释20倍后,在分析谱线310.050 nm处进行测定。选择仪器最佳工作条件,研究共存元素的干扰。结果表明:钆的线性范围为1~100μg/m L,线性相关系数大于0.999 7;加标回收率为98.9%~101.1%,测定值的相对标准偏差(n=11)为0.61%~1.06%。     

高中信息技术教学中项目式教学法的有效应用

项目式教学法本质是让学生自行规划、设计、实施并完成一个相对独立的项目,并进行有效的评价,是实践与体验的重要表现形式。在信息技术课堂中,教师可以应用项目式教学法,坚持“以终为始”,以学生为中心,让学生自行组建团队、选题规划、探究实施、开展评价,调动内在潜力,主动学习、自主探究,提高问题解决能力及创新能力,实现知识技能的建构及在实践中的有效延伸。下面,笔者谈谈在信息技术课堂中教师应如何有效应用项目式教学法。