抗震结构非线性随机反应及动力可靠性分析

本文在考虑了地震发生的随机性,以及地震烈度所对应的加速度峰值为随机变量,并进行了统计分析的基础上,建立了结构在设计使用期内可靠性分析的一般表达式。给出了多层剪切型钢筋混凝土框架结构的非线性随机地震反应的计算方法,并基于弹塑性变形破坏机制、变形和滞变能耗双重控制破坏机制,相应地提出了可靠性分析的计算方法。     

OV-POSS改性CM胶料的硫化行为及其硫化胶的性能

将氯化聚乙烯弹性体(CM)与笼型八乙烯基倍半硅氧烷(OV-POSS)进行共混,制备POSS改性CM胶料;采用过氧化二异丙苯(DCP)为硫化剂,三烯丙基异氰脲酸酯(TAIC)为助硫化剂,利用无转子硫化仪对该改性胶料的硫化行为及硫化动力学进行研究。利用动态力学热分析仪(DMA)以及热机械分析仪(TMA)对硫化胶的力学性能、热稳定性能,及其动、静态热机械性能进行了研究。结果表明：随着OV-POSS用量的增加,改性胶料的硫化反应活化能逐步降低,硫化速度加快,硫化胶的拉伸强度、玻璃化温度(T_g)相应提高。表明OV-POSS对CM的硫化具有促进作用,加入OV-POSS,可改善其硫化胶的力学性能以及提高热稳定性能。     

准噶尔盆地异常压力特征及其对深层-超深层致密储层的影响

准噶尔盆地深层-超深层领域近年来连续获得发现和突破,储层为非常规致密储层且发育异常高压。为明确异常高压发育特征及其对储层质量的影响,利用已钻重点井完井系统试油测压数据进行统计分析,确定盆地深层-超深层压力分布特征和类型,结合成岩作用类型,明确其对致密储层质量的影响。结果表明：(1)深层-超深层广泛发育异常高压,剩余压力大,压力系数高,垂向和平面分布范围广;(2)可划分为一般、中等、强和超强等4个异常高压区,西部和东部区块主要位于一般和中等异常高压区,中部区块主要位于一般和强异常高压区,南部区块从一般到超强异常高压区均有分布;(3)压力系数垂向演化可分为渐变、突变和多变等3种类型,具有不同成因。异常高压对深层-超深层致密储层影响主要体现在：(1)通过增强孔隙流体承压能力,减弱岩石骨架颗粒压力,抑制压实作用,使储层保留大量原生粒间孔隙;(2)通过抑制胶结物的生成和析出,减弱胶结作用,使胶结物体积分数随埋深增加持续下降;(3)通过抑制有机质演化,延长生、排烃期,延长和扩大有机酸作用的时间和范围,增强溶蚀作用,形成次生孔隙;(4)通过促进孔隙流体压力积聚,当孔隙流体压力超过上覆地层压力的60%...     

Copula-based joint distribution analysis of wind speed and wind direction: Wind energy development for Hong Kong

Accurate and reliable assessment of wind energy potential has important implication to the wind energy industry. Most previous studies on wind energy assessment focused solely on wind speed, whereas the dependence of wind energy on wind direction was much less considered and documented. In this paper, a copula-based method is proposed to better characterize the direction-related wind energy potential at six typical sites in Hong Kong. The joint probability density function (JPDF) of wind speed and wind direction is constructed by a series of copula models. It shows that Frank copula has the best performance to fit the JPDF at hilltop and offshore sites while Gumbel copula outperforms other models at urban sites. The derived JPDFs are applied to estimate the direction-related wind power density at the considered sites. The obtained maximum direction-related wind energy density varies from 41.3 W/m² at an urban site to 507.9 W/m² at a hilltop site. These outcomes are expected to facilitate accurate micro-site selection of wind turbines, thereby improving the economic benefits of wind farms in Hong Kong. Meanwhile, the developed copula-based method provides useful references for further investigations regarding direction-related wind energy assessments at various terrain regions. Notably, the proposed copula-based method can also be applied to characterize the direction-related wind energy potential somewhere other than Hong Kong.     

甜菊甙研制中改进絮凝工艺的研究

作者研究了甜菊甙分离过程中的提取液和大孔径吸附树脂解吸液的絮凝工艺。对Ca(OH)_2调节的各种pH值条件下去杂效果及机理作了探讨,发现pH在7—8间各种非糖甙杂质除去率较高。在比较了各种絮凝剂的絮凝效果及脱色率后,发现聚氯化铝的絮凝效果及脱色最佳。     

Wolframite Conversion in Treating a Mixed Wolframite–Scheelite Concentrate by Sulfuric Acid

Complete wolframite conversion in sulfuric acid is significant for expanding the applicability of the sulfuric acid method for producing ammonium paratungstate. In this paper, the conversion of wolframite in treating a mixed wolframite–scheelite concentrate by sulfuric acid was studied systematically. The results show that the conversion of wolframite in sulfuric acid is more difficult than that of scheelite, requiring rigorous reaction conditions. A solid H₂WO₄ layer forms on the surfaces of the wolframite particles and becomes denser with increasing H₂SO₄ concentration, thus hindering the conversion. Furthermore, the difficulty in wolframite conversion can be mainly attributed to the accumulation of Fe²⁺ (and/or Mn²⁺) in the H₂SO₄ solution, which can be solved by reducing Fe²⁺ (and/or Mn²⁺) concentration through oxidization and/or a two-stage process. Additionally, the solid converted product of the mixed wolframite–scheelite concentrate has an excellent leachability of tungsten in an aqueous ammonium carbonate solution at ambient temperature, with approximately 99% WO₃ recovery. This work presents a route for manufacturing ammonium paratungstate by treating the mixed concentrate in sulfuric acid followed by leaching in ammonium carbonate solution.     

矿井煤与瓦斯突出防治实践

结合义安煤业有限公司矿井具体瓦斯地质条件与12120工作面的瓦斯抽放实践,介绍了该矿煤与瓦斯突出危险性的预测办法及参数指标的预测步骤,详细分析了该矿防治煤与瓦斯突出的治理技术及应用效果,通过采取符合该矿具体实际的防突技术,提高了矿井瓦斯抽放效果,保证了矿井的安全生产。     

ELID磨削技术在回转曲面加工中的应用

ELID(Electrolytic In-Process Dressing)磨削和轨迹包络磨削加工法(AEGM)是近年来发展的高效、精密磨削加工方法。本文在介绍这两种加工方法的基础上提出了应用ELID磨削技术采用轨迹包络磨削法加工回转曲面的加工工艺,在充分发挥ELID磨削技术和轨迹包络磨削加工法优点的基础上,可以实现回转曲面的高效、精密磨削。     

导杆式轻型液压支架的研究

根据中小型煤矿工作面支护技术需要,研发了一种导杆式轻型液压支架,阐述了液压支架的整体结构和特点。对其导向装置进行了结构创新,并进行了有限元分析。对进一步研究导杆式轻型液压支架具有借鉴作用。     

基于LabVIEW的电液伺服阀测试系统设计与实现

为了解决电液伺服阀测试中手动测试效率低下、误差率高的现状,开发了一种基于LabVIEW图形编程语言的自动测试系统;系统结合NI PCI-6232板卡,用LabVIEW软件实现了电液伺服阀的静态及动态特性的自动测试,系统具有数据采集、处理及实时显示、数据保存等功能;对空载流量特性、零位泄漏特性、压力特性等进行了实验测试,并对测试结果进行了分析,各测试数据在伺服阀允许的误差范围内;实验结果表明测试系统运行良好、数据采集及处理可靠有效。