中国煤层气开发利用前景及其未来战略地位

中国煤层气资源十分丰富，埋深小于2000m的煤层气资源量为22.5万亿m^3，我国许多地区煤层气地面勘探开发和井下抽放已经迅速展开，并且取得了突破性的进展，显示了煤层气的良好的开发利用前景。随着我国能源结构的进一步的调整，天然气在一次能源消费中的比重将由目前的不到3％增加到7％，到2020年将有80～220亿m^3供需缺口，届时煤层气产量将达到220亿m^3，形成独立的煤层气产业，成为常规天然气的战略补充资源。     

采煤机的故障分析与诊断及其发展趋势

分析了采煤机的常见故障,一般出现在机械系统和液压系统;给出了现在常用的故障诊断方法,如温度监测诊断、铁谱分析法、故障诊断专家系统、基于人工神经网络的采煤机故障诊断系统,并指出了它们各自的局限性,再进一步预测了人工神经网络和专家系统相结合的智能故障诊断方法是将来的发展趋势。     

单相短路对110kV和220kV变压器中性点绝缘的影响及其防护

计算了单相短路时110kV和220kV变压器中性点的稳态过电压、暂态过电压和失地过电压,并分析了这几种过电压对中性点绝缘的影响.     

基于RBF网络的低成本惯组中陀螺仪的温度补偿

针对在低成本捷联惯性导航系统中动力调谐陀螺仪的输出信号随温度漂移严重的问题,使用径向基函数神经网络进行补偿.采用RBF神经网络建立温度补偿模型,以温度信号为网络的输入训练样本,以陀螺仪的温度漂移为网络的目标输出.神经网络的结构为输入层和输出层各有1个节点,中间隐层含有4个节点,隐层节点的聚类中心均匀分布在温度的变化范围之内.结果表明,该方法能有效将低成本惯组中动力调谐陀螺仪输出信号中的温漂误差减小一个数量级以上,从而提高惯组的导航精度.     

Potential of zero free charge of Pd overlayers on Pt(1 1 1)

Differential capacitance measurements of Pd overlayers on a Pt(1 1 1) electrode in dilute aqueous NaF solutions have been performed as a function of film thickness in order to determine the potential of zero free charge (pzfc). The pzfc of the first, pseudomorphic Pd monolayer on Pt(1 1 1) is −0.21 V versus SCE. By increasing the amount of deposited Pd, a clear shift of the pzfc to more positive values is observed. After deposition of an equivalent of 10 monolayers, the value approaches that of a massive Pd(1 1 1) electrode (−0.12 V versus SCE). The pzfc's for the various Pd coverages are correlated with surface structure information, derived from STM images (R. Hoyer, L.A. Kibler, D.M. Kolb, Electrochim. Acta 49 (2003) 63). Variations in the pzfc are discussed in the context of an electronic modification by the underlying substrate and are compared with corresponding data for Pd overlayers on Au(1 1 1).     

负摩阻力计算及对桩承载力的影响

探讨了负摩阻力的计算方法及考虑负摩阻力时对桩承载力的验算，对软土层超过１５米，上部堆载大或地下水位大幅度下降地区的桩，尤其是端承桩而言，具有较大的工程实际意义。     

烟气轮机运行中动平衡破坏的原因分析及维护措施

对引发烟气轮机动平衡破坏的原因进行分析 ,并举例加以说明 ,进而提出了烟气轮机平稳运行的维护措施     

Quantifying Whitewater Recreation Opportunities in Cataract Canyon of the Colorado River,Utah: Aggregating Acceptable Flows and Hydrologic Data to Identify Boatable Days

The structural norm approach was combined with the Potential for Conflict Index to define recreation streamflow needs for the Colorado River in Utah and Colorado. An online survey was completed by 128 commercial and non‐commercial boaters, who evaluated a range of flows for whitewater boating. For the Cataract Canyon reach, respondents rated the quality of their recreation experience of specific flows, describing the quality of boating opportunities across the full range of historical streamflows. Ranges for both acceptable and optimum flows were defined, as well as thresholds for unacceptable flows. These ranges were then evaluated against historical hydrologic records to quantify the timing, frequency, and duration of days when defined whitewater flows exist across different year types (i.e. average boatable days). Results indicated that on average, a total of 257 boatable days existed in dry years, and 353 total boatable days occurred in dry‐typical years. In wet and wet‐typical years, 362 and 365 total boatable days respectively, occurred on average. Results of the boatable days' analysis indicated that over the 23‐year period of record, whitewater boating opportunities occurred nearly every day of the year in all but the driest year types. Results from this study provide resource managers with information which can be used in the development of annual operating plans for the Colorado River Basin and help managers understand how changes in flow impact the quality of recreational opportunities. This application demonstrates the value of analysing boatable days on any river where recreation management is a priority. Copyright © 2016 John Wiley & Sons, Ltd.     

Use of cascade reduction potential for selective precipitation of Au,Cu, and Pb in hydrochloric acid solution

Optimization of reduction potential for electroseparation was studied for the recovery of gold, copper, and lead from acidic solution. A linear sweep voltammetric method enabled us to determine characteristic reduction potentials for each metal and the kinetics of the metal deposition indicated by current-voltage curves. In order to precipitate the metal species sequentially, reduction potentials were examined for the individual and mixed solutions of Au(III), Cu(II), and Pb(II). The three metals were reasonably well isolated from the mixed solutions such as Cu(II)/ Pb(II) and Au(III)/Cu(II)/Pb(II) in the order of the corresponding reduction potentials, in particular, the mass transfer controlled reduction potentials, obtained from linear sweep voltammetry (LSV) measurement.     

管内阴极保护的数值模拟(Ⅱ)——有限差分法计算大口径管内的电位分布

采用有限差分技术对大口径输水管道管内阴极保护电位分布进行计算,理论值与实测值符合得较好。