基于图形处理器的形态学重建系统

形态学重建是医学图像处理中非常基础和重要的操作。它根据掩膜图像的特征对标记图像反复进行膨胀操作，直到标记图像中的像素值不再变化为止。对于传统基于中央处理器（CPU）的形态学重建系统计算效率不高的问题，提出了使用图形处理器（GPU）来加速形态学重建。首先，设计了适合GPU处理的数据结构：并行堆集群；然后，基于并行堆集群，设计和实现了一套基于GPU的形态学重建系统。实验结果表明，相比传统基于CPU的形态学重建系统，基于GPU的形态学重建系统可以获取超过20倍的加速比。基于GPU的形态学重建系统展示了如何把基于复杂数据结构的软件系统高效地移植到GPU上。     

滴淋堆浸技术处理氧化贫金矿

某金矿矿石类型为黄铁矿化石英脉型金矿石和蚀变岩型金矿石,对低品位(0.5~1.50 g/t)氧化矿采用堆浸工艺处理。柱浸试验表明,矿石粒度-30 mm,溶液pH值10.5,浸出率达78%。采用分段式筑堆方式,上层叠加,堆处理矿石14.41万t,平均品位1.07 g/t,采用滴淋的方法,溶液直接作用于矿粉堆表面,解决了矿粉表面积水及入渗的难题,获得浸出率81.3%、产出120.34 kg金锭的工艺指标。喷淋与滴淋方式对照生产表明,滴淋方式更有利于金的浸出。     

人工堆山工程对周边环境影响数值模拟研究

对软土地基上的拟建堆土工程进行了有限元计算,探讨了当堆土高度较高时引起周边土体的沉降和水平位移,并通过超孔隙水压力消散时间分析堆土引起的沉降固结达到稳定所需的时间,得出了一些有参考价值的结论。     

某低品位高硫高碳难处理金矿无氰堆浸工艺工业试验研究

贵州泥堡金矿为低品位高硫高碳高粘土含砷的微细粒难处理金矿,采用新型环保型浸金药剂进行浸金工业试验,取得了与氰化浸金工艺相当的效果.此法的成功应用和推广对今后金矿的无氰堆浸生产有一定的指导作用.     

伟晶花岗岩型铀矿石堆浸工艺研究与应用

介绍某低品位伟晶花岗岩型铀矿石矿物特性。研究在混合氧化剂存在条件下的这种难浸矿石的堆浸工艺。500 t半工业结果表明:试验解决了该类型矿石堆浸工艺,达到了工业生产要求的技术指标。     

原地爆破浸出采铀技术的改进及应用

从爆破工艺、落矿筑堆施工、布液浸出等方面对原地爆破浸出采铀技术进行了改进,并通过在西安中核蓝天铀业有限公司具体采场的应用,证实改进是有效的.应用实践表明,将原地爆破浸出与常规采矿有机结合,实现优势互补,对提高资源的回收利用率具有很好效果.提出了对原地爆破浸出采铀技术发展的几点建议.     

改进A*算法的多约束航迹规划

针对当前航迹规划的研究偏于理论、规划效率不高的问题, 从工程应用出发, 分析了航迹规划的多种约束条件, 提出了一种多约束条件下的快速航迹规划方法, 设计了基于航向角有限离散变化思想的工程化搜索策略;改进了A*算法流程, 采用结构体链表式的最小二叉堆技术管理OPEN表和CLOSE表, 显著提高算法的规划效率;提出了删除航路点的航迹优化方法, 对传统A*算法和改进的算法分别进行了仿真。结果表明, 在多约束条件下, 该方法显著提高了规划效率。     

Spatial distribution of chromium in soils contaminated by chromium-containing slag

To evaluate the metal chromium (Cr) contamination of soil at a chromium-containing slag site by ferrochromium production, the contaminated sites, under slag heap, in the vicinity of slag heap and arable soils near the outlet of sewer channel, and unpolluted site 5 km away from one ferroalloy plant in Hunan Province, China, were selected. The concentrations of total Cr and water soluble Cr in bulk soil samples and profile depth samples were determined. The results show that the soils in the vicinity of slag heap have the highest total Cr content followed by the soils under the slag heap and near the outlet of sewer channel of the factory. The mean concentrations of total Cr in the top soils at above three contaminated locations exceed the critical level of Secondary Environmental Quality Standard for Soil in China by 3.5, 5.4 and 1.8 times. In most Cr polluted soils, total Cr has a relative accumulation in soil depth of 40-60 cm, but this trend is not found in unpolluted soils. The average concentrations of water soluble Cr (Ⅵ) in top soils under slag heap and in the vicinity of slag heap are 176.9 times and 52.7 times higher than that in the uncontaminated soils, respectively. However, water soluble Cr (Ⅵ) contents in soils near sewer channel are all low and the values are close to that in the uncontaminated soils. Although water soluble Cr (Ⅵ) content in soil profiles decreases with soil depths, it in soils under slag heap maintains a high level even at a depth of 100-150 cm. The results imply that the transportation of Cr (Ⅵ) can result in a potential risk of groundwater system in this area.     

水平料槽测定法测定高炉料流堆尖位置

水平料槽测定法是一种测定高炉料流堆尖位置的新方法。该方法是在炉喉水平径向安装接料槽，通过料槽能够较为方便、准确地测定不同料种、不同溜槽倾角和不同料线情况下炉料堆尖位置，为选定合适的布料角度提供依据。     

Implementation Strategies for First-Class Continuations

Scheme and Smalltalk continuations may have unlimited extent. This means that a purely stack-based implementation of continuations, as suffices for most languages, is inadequate. We review several implementation strategies for continuations and compare their performance using instruction counts for the normal case and continuation-intensive synthetic benchmarks for other scenarios, including coroutines and multitasking. All of the strategies constrain a compiler in some way, resulting in indirect costs that are hard to measure directly. We use related measurements on a set of benchmarks to calculate upper bounds for these indirect costs.