刘楼铁矿采矿方案优化探析

通过对浅孔留矿法与充填采矿法适应性对比分析,分析了上向分层与分层进路采矿法在刘楼矿实行的必要性,系统阐述了进路分层充填法的实施方案、分层充填法回收矿柱实施工艺及存在的主要问题和改进措施,克服了浅孔留矿法采矿作业中的安全难题,消除了采空区危害,提高了回采率,降低了贫化率,使矿产资源得到充分有效回收。     

基于分簇结构无线传感器网络的高效无源定位方法

针对基于节点通信能力和能量受限的无线传感器网络实现高精度无源定位的问题,首先,在分簇结构网络中,通过折中单个簇的TDOA定位精度和运算复杂度,确定了簇规模;其次,基于直达波环境中TDOA定位误差是按布站GDOP对测量误差放大的原理,提出第一轮定位先使用网内所有节点以RSSI定位方法粗估计目标辐射源位置,并根据各簇在该粗估计位置处的布站GDOP和测量误差估算TDOA定位标准差,第二轮定位选择具有较低TDOA定位估计标准差的部分簇参与TDOA定位,最后将这些簇的TDOA定位结果按估算的定位估计标准差加权平均,求得最终定位解。仿真结果证明该方法有效的去除了冗余节点,实现以半数节点接近使用全部节点的定位精度。      

Effects of interphase conditions on the tensile and fatigue properties of short-fiber reinforced rubber

The effects of the amount of nylon-66 short-fiber and its bonding to a chloroprene rubber were studied. The following results were obtained: (a) The tensile strength of short-fiber reinforced rubber (SFRR) exhibits a dilution effect in each interphase. It was found that the interphase conditions have an important effect on the dilution ratio and the critical fiber content. The specimen with double coatings of the bonding agent and a rubber solution, becomes the best of 5 interphase models. Both the yield strength and tensile moduli significantly improve with fiber content. (b) The spring constant (SC) of unreinforced rubber decreases after the fatigue test, however, the SC of all reinforced rubbers increases. The change in SC of reinforced rubber decreases with fiber content. The better the interphase condition, the smaller the change of the SC. (c) The temperature of rubber increases about 2.6 fold after the fatigue test. The reinforced rubbers show a 1.4 to 2.2 fold increase in temperature. The temperature changes during the fatigue test of the reinforced rubbers decrease with increasing fiber content, as well as with improved interphase bonding.     

FEM modeling and experimental verification for dilution control in laser cladding

A model for the determination of the clad geometry and dilution in laser cladding is presented. The model uses a novel approach to determine the clad geometry. This involves a mathematical transformation of the balance equations describing the physical effects. The correlation between observable melt pool characteristics and dilution is investigated using this model. Simulations were performed for different combinations of cladding speed, laser power (distribution) and substrate temperature. Simulation results are compared to experimental results, showing a high degree of agreement. A high correlation between melt pool width and dilution was found, which was almost independent of the process settings and substrate temperature. This makes the width an excellent sensor for online dilution control.     

黑索今在丙酮-水混合溶剂中介稳区的测定及关联

采用溶析结晶法测定了黑索今在纯丙酮以及丙酮与水混合溶剂中的溶解度与超溶解度,得到了黑索今结晶介稳区。用Apelblat经验方程模拟了黑索今在纯丙酮中溶解特性,用（CNIBS）/Redlich-Kister方程模拟了黑索今在丙酮和水体系中溶解特性,模拟精度均在99%以上。     

电子低压冲击器不同稀释比对PM2．5排放测试的影响

燃煤电厂PM2.5排放检测技术是目前研究的热点和难点,电子低压冲击器（ELPI）可以实时得到颗粒物的质量浓度,方便工程现场测试。利用ELPI对扬州第二发电厂600 Mw机组湿法脱硫后烟气进行测试研究,并分别尝试采用一级稀释器和两级稀释器两种方法进行比较,结果表明：两种稀释比测得颗粒数浓度粒径分布规律基本一致,采用两级稀释测得PM1、PM2.5、PM2.5数浓度结果均小于一级稀释;对于质量浓度,采用两级稀释测得PM1、PM2.5结果小于一级稀释,而PM2.5测量结果却大于一级稀释。     

端部放矿贫化损失的预测研究

放矿贫化损失指标的预测和控制方法是放矿理论研究的重要内容,现有的端部放矿理论仅研究了放出体正面废石混入贫化率的计算方法,无法实现生产实际放矿过程中,对多方废石混入贫化损失指标的预测和控制。为此,研究了端部放矿过程中多方废石混入贫化损失的形成机理。在现有放出体正面废石混入贫化率计算的基础上,提出了放出体顶部废石混入贫化损失指标的计算方法,放出体侧面废石混入及放出体多方废石混入贫化和损失指标的计算方法,建立了较完整的端部放矿贫化损失指标的预测计算体系。     

提高孝义铝矿铝土矿资源利用率初探

针对孝义铝矿铝土矿资源状况 ,指出提高该资源利用率的意义。从改善采矿方法 ,降低矿石贫化损失 ,利用脱硅选矿技术和综合利用尾矿等方面探讨了提高铝土矿资源利用率的途径     

Explosion characteristics of hydrogen–nitrogen–air mixtures at elevated pressures and temperatures

An experimental study on the combustion characteristics of nitrogen diluted hydrogen was conducted in a constant volume combustion vessel over a wide range of equivalence ratios and dilution ratios at elevated pressures and temperatures. The explosion characteristics such as the explosion pressure, the combustion duration, the maximum rate of pressure rise, the deflagration index and the normalized mass burning rate were derived. The result shows that a short combustion duration and higher normalized mass burning rate were presented with the increase of equivalence ratio. With the increase of initial temperature, the explosion pressure, the maximum rate of pressure rise and the deflagration index were decreased, and a shorter combustion duration and higher normalized mass burning rate were presented. With the increase of initial pressure, the explosion pressure, the maximum rate of pressure rise and the deflagration index increase, a shorter combustion duration and higher normalized mass burning rate were presented. Nitrogen dilution significantly reduces the normalized mass burning rate and the deflagration index and thus the potential of explosion hazards.