A probabilistic framework for specular shape-from-shading

One of the problems that hinders conventional methods for shape-from-shading is the presence of local specularities which may be misidentified as high curvature surface features. In this paper we address the problem of estimating the proportions of Lambertian and specular reflection components in order to improve the quality of surface normal information recoverable using shape-from-shading. The framework for our study is provided by the iterated conditional modes algorithm. We develop a maximum a posteriori probability (MAP) estimation method for estimating the mixing proportions for Lambertian and specular reflectance, and also, for recovering local surface normals. The MAP estimation scheme has two model ingredients. First, there are separate conditional measurement densities which describe the distributions of surface normal directions for the Lambertian and specular reflectance components. We experimentally compare three different models for the specular component. The second ingredient is a smoothness prior which models the distribution of surface normal directions over local image regions. We demonstrate the utility of method on real-world data. Ground truth data is provided by imagery obtained with crossed polaroid filters. This reveals not only that the method accurately estimates the proportion of specular reflection, but that it also results in good surface normal reconstruction in the proximity of specular highlights.     

移动床过滤除尘的直接数值模拟研究及实验对比

利用格子气和软球模型建立气固两相流数值模拟计算模型，模拟计算了在同一风速下碰撞次数与粉尘粒径之间的关系，初步研究移动过滤层颗粒对粉尘尺寸的过滤选择性。计算统计的结果与实验结果对比发现，二者存在定性上的一致。计算结果表示在移动床过滤中过滤效率对尘粒粒径具有明显的选择性，而且研究结果还表明格子气自动机模型可用于模拟流体在复杂边界条件下多孔介质细微通道内部的流动。     

LF精炼过程中顶渣硫容量、分配比和脱硫率的确定

为了确定LF精炼过程中顶渣的脱硫能力，通过对光学碱度的计算，得出了1627℃时CaO-SiO2-Al2O3-MgO(5％)渣系组成与硫容量的关系图。由硫容量、氧活度(与钢中溶解铝平衡值)计算出硫分配比，绘出了不同硫分配比时脱硫率与渣量的关系图，提出了一个由已知渣组成、渣量、钢液氧活度和硫含量来计算LF精炼过程中最大脱硫率的简便方法。     

FEM for evaluation of weight functions for SIF, COD and higher-order coefficients with application to a typical wedge splitting specimen

In the evaluation of accurate weight functions for the coefficients of first few terms of the linear elastic crack tip fields and the crack opening displacement (COD) using the finite element method (FEM), singularities at the crack tip and the loading point need to be properly considered. The crack tip singularity can be well captured by a hybrid crack element (HCE), which directly predicts accurate coefficients of first few terms of the linear elastic crack tip fields. A penalty function technique is introduced to handle the point load. With the use of these methods numerical results of a typical wedge splitting (WS) specimen subjected to wedge forces at arbitrary locations on the crack faces are obtained. With the help of appropriate interpolation techniques, these results can be used as weight functions. The range of validity of the so-called Paris equation, which is widely used in the evaluation of the COD from the stress intensity factors (SIFs), is established.     

聚变驱动次临界堆双冷嬗变包层第一壁结构热应力计算与分析

使用有限元程序对聚变次临界堆双冷嬗变包层第一壁进行数值模拟 ,给出不同载荷条件下的温度场和应力场分布 ,结果证明典型氦气系统设计满足热工要求。依据数值模拟结果对第一壁氦气载热能力进行分析 ,并考虑了流道形状对结构热应力的影响。     

A preliminary study on total removal efficiency of organic pollutants in sewage by Harbin municipal sewage treatment plant

To evaluate the removal efficiency of organic pollutants in the sewage by Harbin municipal sewage treatment plant,the influent and effluent samples from the plant were pretreated by liquid-liquid extraction (LLE) under conditions of acidity,neutrality and alkalescence in sequence,and then were analyzed by gas chromatograph-mass spectrum (GC-MS) procedures.Results indicate that there are 70 species of organic pollutants in the influent sample of the plant,which mainly consist of alkyls,benzene series,esters,and heterocyclic compounds.Some of these organic pollutants are biotoxic and belong to persistent organic pollutants (POPs).Four species among them are on the list of Prior Pollutants of Environmental Protection Agency of USA (USEPA).However,7 species of organic pollutants appearing in the effluent sample mainly include alkyls of multi-carbons and phthalate esters.The removal efficiency of phthalates is poor because of their poor biodegradability.The sewage treatment technique is effective in removing most of organics pollutants.     

低COD处理沉钒废水回收低铁含铬渣冶炼金属铬

用焦亚硫酸钠、海波上层液分别处理沉钒废水,研究表明:海波上层液还原沉钒废水COD高达2 878 mg/L,远超排放标准;用焦亚硫酸钠还原沉钒废水,中和、沉淀能够获取低COD废水、低铁含铬渣。用焦亚硫酸钠处理沉钒废水工业运行技术条件:焦亚硫酸钠加入倍数3.1~3.2,还原反应时间15~30 min。处理后废水经汽提脱氨塔脱氨后,排向污水处理厂的废水未检出六价铬,COD平均值65 mg/L,符合辽宁省地方排放标准《污水综合排放标准》DB21/1627—2008排放限值,所得含铬渣中铁含量较低(以Fe2O3计0.27%),铬含量高(以Cr2O3计41.6%)。含铬渣经煅烧窑煅烧、炉外法冶炼出牌号JCr95金属铬(Cr≥95%)产品,质量合格。     

二次侧非能动余热排出系统流动不稳定性研究

二次侧非能动余热排出（ASP）系统是压水堆核电厂应对全厂断电事故的重要措施之一。为研究ASP系统的运行特性,设计建造了ASP系统试验装置（ASPTF）。在ASPTF上开展了ASP系统运行稳定性影响试验,并对试验结果进行了理论分析。试验研究与理论分析结果表明：低压低功率下ASP系统中出现流动不稳定性;增加蒸汽管线或回水管线阻力系数可抑制ASP系统出现流动不稳定性;降低加热功率时ASP系统更易出现流动不稳定性;主泵运行状态影响ASP系统的输入功率进而影响系统的流动不稳定性。     

贫液除杂与污水零排放的试验研究

根据仓上金矿生产实际情况,探讨了贫液除杂质的途径及除杂后对浸出效果的影响,为仓上金矿实现氰化污水零排放提供了基础资料。     

高砷次氧化锌综合回收试验研究

介绍了硫酸焙烧法处理高砷次氧化锌的试验研究,主要探讨了焙烧的温度,时间及硫酸用量对有害元素砷,氟、氯等脱除率的影响,工业试验证明,铅,锌,锗的直收率分别为99％,98％,60％以上,砷的脱除大于90％,氟、氯的挥发率大于95％。