六高调门配置汽轮机喷嘴进汽模式对轴系稳定性影响的试验研究

首先针对六高调门汽轮机调门局部进汽模式下的配汽不平衡汽流力进行理论分析,在典型六高调门配置汽轮机调门开关试验的基础上,得到六高调门配置汽轮机进汽模式对轴系稳定性的基本影响规律:喷嘴配汽采用上缸进汽和下缸进汽时,后面开启的3个高调门存在一个最优开启顺序;极端情况下,还可采用两阀联合调节进汽模式;然而,对角进汽模式对轴系稳定性的影响仍为最小。这对在国内占一定比例的六高调门配置大功率汽轮机安全高效运行优化具有一定借鉴意义。     

惯性导航仪用新型铸造铝合金研究

研究了惯性导航仪用新型Ａｌ－Ｚｎ－Ｍｇ系高尺寸稳定性铸造铝合金。新型合金为ＺＡｌＺｎ４Ｍｇ４，具有较高强度及良好的综合性能。研究了Ｚｎ、Ｍｇ、Ｃｕ、Ｔｉ及Ｚｒ等元素和热处理工艺对合金性能的影响，并测定了合金的物理性能和尺寸稳定性。     

Study on temperature field of the drilling machine during the course of drilling in coal mine

The working conditions of the MK-3 type full hydraulic tunnel drilling machine during the course of drilling were analyzed. Based on the energy balance governing equations for the drill rod, the temperature field of drill rod at the normal and non-normal working conditions was numerically obtained. The numerical results show that the maximum temperature at the head of drill rod under the normal working circumstance is insufficient to ignite the gas. But under the non-normal working condition, the local high temperature can ignite the gas easily and cause the fire. In order to prevent the gas fire, the occurrence of the non-normal operating condition must be prevented as far as possible during the drilling.     

计及FACTS装置的最大输电能力研究

输电能力是所有电力市场的参与者进行交易活动所必需的重要信息。文中提出了一种考虑常见FACTS装置（如UPFC，TCPS，TCSC等）的最大输电能力计算模型，在模型中考虑了电压水平、线路和设备过负荷等静态安全性约束条件，以及由于潮流方程解的鞍点分叉导致的电压稳定性约束条件。在算法上选用逐次线性化优化方法，并对每一个线性化子问题采用新算法——预测校正原始对偶对数障碍内点法求解。算例计算结果不仅说明了不同的FACTS装置和安装位置对电网的输电能力有不同程度的影响，同时也表明了文中的模型和算法是有效的，具有一定的应用价值。     

Performance assessment of water mist applied in gas burning suppression in underground coal mine

The main objective of the present study was introduced water mist suppression technology to prevent and control gas burning which occurred during drilling at Wu20160 working-face in No.10 coal mine of Pingdingshan Ltd.. Based on the self-developed experiment platform, a series of fire suppression tests to evaluate the performance of a water mist system were conducted. The detailed measurements of the spray characteristics, i.e., the Sauter Mean Diameter （SMD）, the velocity and spray angle which are the main parameters considered in the study, were obtained by using LS-2000 Sizer. The amount of water consumed and the water flux density distribution over the cross section downstream the nozzle exit were measured by cup collector method. The operating pressure of the water mist nozzle is set to 0.5 MPa, the droplet SMD of 104 pm, the water flux density distribution from 0.71 to 8.47 L/（m^2·min）, the average velocity of 2.14 m/s. The experimental results show that the averaged time required for extinguishment is 3.14 s, and the corresponding amount of water used during fire test is about 0.11 kg. The gas fire suppression system reduces the temperature in combustion chamber of the experimental apparatus below the ignition point of the gas, which can effectively avoid the occurrence of the gas fire in coal mine.     

高损伤阈值双色膜

结合双色膜的驻波场分布优化膜系设计,以电子束蒸发的方式制备了1 064 nm高透过、532 nm高反射的HfO2/SiO2双色膜。采用1-on-1方式测量了双色膜在基频透过光和倍频反射光的辐照下的损伤阈值,为了研究双色膜在基频和倍频下的损伤机制差异,对比了双色膜不同的初始损伤形貌并分析了其形成原因。针对损伤机制的差异,研究了外层驻波场分布对于倍频反射光辐照下的双色膜损伤特性影响以及氧化硅内保护层对于基频透过光的损伤特性的影响。实验结果表明:氧化硅内保护层和驻波场优化有助于提高双色膜在基频光和倍频光辐照下的激光损伤阈值,并对其机理做了分析。     

某复杂稀土矿湿式电磁选与超导磁选预富集试验研究

为考查内蒙古某复杂多金属矿中稀土矿物的磁选预富集效果,本文采用常规湿式电磁选和超导磁选两种磁选方式,开展了系统的试验研究,结合X射线衍射仪(XRD)、振动样品磁强计(VSM)和扫描电镜(SEM)测试等手段,对预选产品进行了分析和表征。结果表明：与湿式电磁选“一粗一扫”流程的分选效果相比,超导磁选工艺经过一次粗选可获得抛尾率为66.74%、精矿稀土氧化物(REO)品位为2.855%、REO回收率为92.82%的预选指标。XRD、VSM和SEM分析结果表明,稀土矿物经超导磁选可获得高效预富集,超导磁选精矿比磁化系数最大值达4.299×10^-6 m~3/kg,磁性略强于湿式电磁选精矿产品,具有高背景磁感应强度优势的超导磁选可有效回收解离不完全的稀土矿物弱磁性贫连生体,实现REO的高效预富集。     

中小尺度总体城市设计的探索——以戴南镇总体城市设计为例

以戴南镇总体城市设计为例,对中小尺度总体城市设计进行探索,构建功能结构和景观风貌结构,寻找符合地方规划管理实际,彰显城镇空间特色的规划方法。在反馈总体规划的同时,指导下层次规划及城市设计的编制。