基于RTDS的区域保护备自投功能动模试验研究

针对智能变电站在调试和运行过程中出现的诸多问题,需要一种新的检测方式进行试验验证和诊断分析,随着数字化继电保护技术的广泛应用,应用传统的静态测试方法很难对继电保护装置的内部逻辑和功能进行完整的测试。提出了一种基于RTDS的闭环仿真测试方法,通过搭建模型及动模试验对区域保护装置备自投的功能进行测试,发现了设备存在的缺陷并提出了修改方法。     

注浆加固在地基沉降安全隐患治理中的研究与应用

为了解决某露天矿配套附属建筑地基下沉的安全隐患问题,研究分析了在既有建筑物条件下处理大面积填土桩基沉降的方法。通过为期1/2 a的沉降监测,表明了注浆加固在消除填土负摩阻力治理基础沉降方面的适用性。     

鑫岩煤矿井下煤矸分选与充填开采一体化系统设计

为解决煤炭生产过程中矸石严重影响生态环境的问题,实现安全、高效、绿色开采。结合鑫岩煤矿井上、下生产系统和开采条件,确定鑫岩煤矿井下煤矸分选与充填开采一体化系统。针对系统中滚轴筛设备选型及布置、原煤仓和矸石仓容量、综采工作面充填能力及关键设备选型和地面矸石垂直投料系统管径选型进行了设计,为鑫岩煤矿实现绿色开采提供技术保障,为类似条件矿井的井下分选与充填开采设计提供借鉴。     

GIS数据库中面状要素更新方法研究与实现

GIS数据库是地理信息系统的重要组成部分和应用资源,对于GIS数据库更新体系的理论和技术研究,保持地理空间数据的现势性,是GIS的首要问题。ArcGIS软件是一个功能比较强大的分析管理及应用GIS软件,本设计采用ArcGIS完成了面状要素的更新工作,在本文中,采用GIS集成二次开发的方法,通过ActiveX（OCX）控...     

Performance of an annular solid-oxide fuel cell micro-stack array operating in single-chamber conditions

An annular micro-stack array consisting of four fuel cells has been fabricated and operated successfully in single-chamber conditions using a nitrogen-diluted oxygen-methane mixture as the operating gas. The single cells consist of a state-of-the-art porous NiO/Y₂O₃-stabilized ZrO₂ (YSZ) anode support, a YSZ electrolyte membrane and a modified La_0.7Sr_0.3MnO₃ (LSM) cathode. The annular configuration of the array is favorable for utilizing the heating effect. The maximum power output of the annular stack decreases with increasingCH₄/O₂ ratio. Its performance increases with increasing CH₄ flow rate and decreases with increasing N₂ flow rate. The power output of the stack is ∼380 mW at CH₄/O₂ = 1 and an N₂ flow rate of 100 sccm and the average maximum power density of each cell is ∼190 mW cm⁻². The average performance of each cell in the annular micro-stack array is higher than that of an additional single cell placed next to the stack.     

基于CCD的通用测长仪的研制

现代加工技术的迅速发展，自动化程度、加工精度的不断提高，对检测设备提出了高精度，自动化，在线检测等等的新要求，为了解决大尺寸尤其是回转体轴盘类工件大直径尺寸的高精度测量技术难题，文章提出了用于解决大尺寸测量、高精度测量的通用测长仪的，该系统按照伽利略激光扩束原理设计了半导体激光器的扩束系统；在机械结构设计中，系统采用燕尾式导轨，为了提高激光器的定位精度，将燕尾滑块和光栅尺的动块固定在一起，这样燕尾滑块的滑动距离可以实时地显示在LED上；数据采集和处理部分采用高速的数字模拟混合处理器C8051F系列单片机作为处理器，利用其内部的丰富资源可以减少片外的扩展，节省电路设计。     

INFLUENCE OF Ce ION IMPLANTATION ON OXIDATION BEHAVIOR OF Ni20Cr ALLOY

ＩＮＦＬＵＥＮＣＥＯＦＣｅＩＯＮＩＭＰＬＡＮＴＡＴＩＯＮＯＮＯＸＩＤＡＴＩＯＮＢＥＨＡＶＩＯＲＯＦＮｉ２０ＣｒＡＬＬＯＹ①ＬｉＭｅｉｓｈｕａｎ，ＭａＸｉｎｑｉｎｇ，ＸｉＬｉｏ，ＬｉＴｉｅｆａｎＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｆｏｒＣｏｒｒｏｓｉｏ...     

The internal oxidation of two-phase binary alloys under low oxidant pressures

The main features of the internal oxidation in two-phase binary alloys are examined for insignificant and important diffusion of the most-reactive component and are compared with the behavior of corresponding single-phase systems. It is shown that two-phase alloys may have two different types of internal oxidation, one of which is similar to that of the single-phase alloys (classical type), producing a uniform distribution of small oxide particles in the zone of internal oxidation, while another is typical of two-phase systems and involves the in situ conversion of the most-reactive component into its oxide. It is also shown that, under the same values of all the relevant parameters, the classical internal oxidation of two-phase alloys involves faster kinetics and smaller degrees of enrichment of the most-reactive component in the zone of internal oxidation than for single-phase alloys. As a consequence of this, the transition to the external oxidation of the most-reactive component in these systems involves higher overall concentrations of the most-reactive component than in corresponding single-phase alloys.     

N,N-Dipropynoxy methyl amine trimethyl phosphonate as corrosion inhibitor for iron in sulfuric acid

The corrosion inhibition of iron in 0.5 M sulfuric acid by N, N-dipropynoxy methyl amine trimethyl phosphonate has been investigated by means of the potentiodynamic polarization and electrochemical impedance spectrum (E.I.S) techniques. N,N-dipropynoxy methyl amine trimethyl phosphonate was studied in concentrations from 40 ppm to 320 ppm at a temperature of 298 K. The results show that the inhibition mechanism of N,N-dipropynoxy methyl amine trimethyl phosphonate is mixed controlled. It is also found that this inhibitor obeys the Frumkin adsorption isotherm and Flory-Huggins isotherm based on a substitutional adsorption process.     

Experimental study of phase equilibria in the PbO-MgO-SiO2 system

An experimental study of the PbO-MgO-SiO₂ system has been carried out using high-temperature equilibration and quenching techniques, followed by electron probe X-ray microanalysis (EPMA). The phase equilibria were determined in the temperature range from 973 to 1673K. Nine primary phase fields have been investigated in this system, including three monoxides (PbO, MgO, and SiO₂), five binary compounds (MgSiO₃, Mg₂SiO₄, PbSiO₃, Pb₂SiO₄, and Pb₄SiO₆), and one ternary compound Pb₈Mg(Si₂O₇)₃. Two other ternary compounds, PbMgSiO₄ and PbMgSi₃O₈, were observed in some experiments; however, further experiments indicated that these two compounds are unstable in the temperature range investigated.