多重复合地基处理的工程实践

对两种地基处理方法——水泥土搅拌桩与CFG桩在同一场地中的联合应用给予介绍,目的是在不均匀地基加固中找到一种合理的加固方法,使加固后的地基满足设计及使用要求。     

新疆某低品位硫化铅锌矿石选矿试验研究

新疆某低品位铅锌矿石矿物组成简单,同时矿物伴生关系复杂、嵌布粒度不均匀。为有效回收矿石中的铅和锌,采用铅锌优先浮选工艺,通过铅锌浮选条件试验确定适宜的选矿工艺流程及药剂制度。结果表明:针对铅品位1.04%、锌品位1.66%的原矿石,在磨矿细度为-0.074 mm占70%的条件下,采用2次粗选优先选铅、铅粗精矿再磨至-0.038 mm占100%后3次精选,可获得铅品位45.16%、锌品位1.21%的铅精矿;选铅尾矿经CuSO₄活化后,采用“2粗3精”选锌;全流程闭路试验最终可获得铅品位44.16%、铅回收率85.04%的铅精矿,及锌品位43.31%、锌回收率92.45%的锌精矿,较好地实现了铅锌分离回收。研究结果可为同类型矿石的开发利用提供有益参考。     

射频识别技术在智能交通信息采集中的设计与应用

提出了一种基于射频识别技术获取交通信息的新方法,完成了射频识别读卡器的设计方案,整个系统以MSP430微处理器为核心,包括发射、接收模块,通过串口与交通控制机通信。     

Transformation of induction heating deposited monetite coating to hydroxyapatite coating on HT-C/C composites by hydrothermal treatment in two types of solution

Monetite coatings on H₂O₂-treated carbon/carbon composites were prepared by induction heating deposition method and then converted to HA coatings by hydrothermal treatment in an autoclave with two different types of solutions, respectively NaOH aqueous solution and ammonia solution. The structure, morphology and chemical composition of the as-achieved HA coatings were characterized by XRD, FTIR SEM and EDS. The adhesion of HA coatings to the HT-C/C substrates was evaluated by a scratch test. The results showed that there are no obvious changes in the structure and morphology for the as-achieved HA coatings except to their compositions. The average critical load of the ammonia hydrothermally treated HA coatings is 10.9 N, while the NaOH hydrothermally treated HA coatings show the average one of 51 N, and the reason for it was suggested.     

Dielectric and microwave absorbing properties of low power plasma sprayed Al2O3/Nb composite coatings

Al₂O₃/Nb composite coatings were sprayed on graphite substrates by low power atmospheric plasma spraying (LPAPS) with an internally fed powder torch. The composite particles were agglomerated with different mass fractions by spray-drying technology. The microstructure and dielectric properties of coatings were investigated. The microstructure of composite coatings shows a uniform dispersion of metal particles in the composite coatings. Both the real (?′) and imaginary (?″) parts of the complex permittivity increase with increasing Nb content over the frequency range of 8.2-12.4 GHz, which is ascribed to space charge polarization and conductance loss, respectively. By calculating the microwave-absorption as a single-layer absorber, reflection loss values exceeding −10 dB can be obtained in the frequency range of 10.0-11.8 GHz with 10 wt% Nb content coating when the coating thickness is 1.5 mm.     

Cr粒子含量对Al2O3/Cr复合材料力学性能及介电性能的影响

以热压烧结的方法制备了Al2O3／Cr复合材料，探讨了Al2O3／Cr复合材料显微结构、力学性能及微波介电性能随Cr粒子含量变化的规律。SEM结果表明，在垂直于压力方向上，Cr粒子有明显的受压拉伸现象；当Cr粒子含量从10vol％增加至30vol％时，复合材料中Cr粒子的分布由孤立向桥连方式转变。随Cr粒子含量的增加，复合材料致密度略有下降，抗弯强度明显降低。与纯氧化铝陶瓷相比，含10vol％Cr粒子Al2O3／Cr复合材料的断裂韧性提高了81％以上。复介电常数测试结果表明，在8．2～12．4GHz频率范围内，复合材料复介电常数的实部和虚部随Cr粒子含量的增加大幅度上升，且存在明显的频散效应。当Cr粒子含量达到30vol％时，由于Cr粒子之间的部分桥连现象而使介电常数虚部在一定频段出现负值。     

我国对流层波导环境特性研究

描述了我国对流层波导环境特性研究的方法和结果。对于我国陆上大气波导，详细介绍了波导气侯区的划分结果和这些地区大气波导随季节和月份的变化情况。重点描述了我国海上蒸发波导的研究方法和研究结果，在叙述了利用海面气象数据得到我国海上蒸发波导特性参数的理论方法之后，说明了我国东海和南海的海区划分，给出了这些海区蒸发波导出现的概率、波导高度、强度的年际变化情况。     

矿井通风测量数据处理方法的集成与应用

基于通风网络和测量平差理论 ,将双气压计基点法、同步法和压差计 -皮管法的测量数据处理有机地结合在一起 ,提出了风阻测量平差的新方法 ;编制了集测量数据处理、精度检验和平差处理为一体的通风阻力测量数据综合处理软件 .以补连塔矿通风阻力实测为例 ,介绍了测量数据的处理过程 .     

运用哈希技术进行关联规则挖掘

以前基于支持度一置信度框架的关联规则挖掘算法都是先用支持度做为阈值对搜索结果进行剪枝 ,产生频繁集 ,再针对频繁集产生关联规则 ,这就是频繁关联规则。然而在很多应用中 ,诸如 :鉴别相似的Web文件、网络中入侵检测等 ,有许多有趣的关联规则仅有很少的支持度。在本文中 ,针对这种情况 ,提出了一种可以挖掘非频繁项之间有趣规则的算法 ,此算法先用相似度作为兴趣度度量对算法结果进行剪枝