关于硫化矿及烧结矿的分析方法（1）

本文介绍了测定硫化铁矿,铜矿,锌矿等作为硫酸原料的矿石和烧结矿中Bi,Cd,Co,Cu,Fe,Ni,Pb,Zn,Al,Cr,TiO_2,V,CaO,MgO,Mn,As,Sb,Se,Te,Sn20种元素的原子吸收分析方法。     

高纯石墨中金属杂质成分的检测研究

本文探讨了快速测定石墨灰分含量中的14种污染物Al,Ca,Cd,Co,Cr,Cu,Fe,Mg,Mn,Mo,Ni,Ti,V,Zn的方法,以满足研究要求,了解石墨精炼效果的要求。     

黑龙江省金龙达经贸有限责任公司

公司成立2002年,公司位于哈尔滨市南岗区中山路258号,企业类型为有限责任公司,经营范围：购销冶金矿产品,冶金炉料,焦炭,生铁,铁合金,金属材料,钢材,有色金属不含稀有金属,化工产品不含危险品,剧毒品,建筑材料,机械设备,炭素材料及石墨制品。     

老挝矿业

老挝位于东南亚地区,北临柬埔寨,南靠中国,西面是越南,东南部是缅甸,东北部是泰国,是一个国土面积仅有237,000平方公里的小国。2005年,人口总数为6,200,000。老挝是亚太地区最贫穷的国家之一,已知的矿产资源有铝土矿,黏土,煤,铜,白云石,黄金,石墨,石膏,石灰岩,石盐,蓝宝石,银,锡,及锌等。老挝2005年的国内生产总值增长率为7.3%,2004年增长率为6.3%。老挝具有得天独厚的地质环境优势,潜在的矿产有:锑,石棉,铋,钴,铁矿,瓷土,铅,褐煤,镁,钼,钾碱,硅沙,及钨等。另外,该国很可能储藏有煤,铜,黄金,铁矿,钾碱,岩盐,及锡等。据老挝工业及手工业部(M…     

基体分离ICP-AES法测定金属铁粉中的杂质元素

研究了在7mol/LHCl体系中,以4 甲基 2 戊酮萃取分离铁,残液用ICP AES法同时测定Mn,Cr,Ni,Cu,Mo,V,Al,Ti,Zn,Cd,Co,Ca,Mg,As,Pb的新方法。方法的检出限为0.002～0.220μg/mL,回收率为93.5%～109%,相对标准偏差小于4.5%。方法简单、快速、准确,应用于金属铁粉中杂质元素的测定,结果令人满意。     

ICP-AES法测定高纯阴极铜中杂质元素

研究了EDTA存在下 ,氯化钠 -二乙基二硫代氨基甲酸钠 -丙醇体系萃取分离铜 ,用ICP AES法同时测定高纯阴极铜样品中Pb ,Fe ,Bi,Sb ,As ,Sn ,Ni,Zn ,P ,S ,Ag ,Se ,Te ,Si,Mn ,Cr的新方法。方法的检出限为 0.0 0 3～ 0.0 2 8μg/mL ,回收率为 94.5 %～ 10 7.2 % ,RSD小于 4.7%。该法准确、快速、简便 ,应用于阴极铜中杂质元素的测定 ,结果满意     

X-射线荧光光谱法测定铝用炭素材料中微量元素

粉末压片法制样,选用预焙阳极、石油焦标准样品,采用X-射线荧光光谱法对样品中的S,V,Si,Fe,Na,Ca,Ni,Ti,Al,P,Pb,K,Mg,Cl,Mn,Cr,Cu,Zn等元素进行测定。讨论了样品研磨时间、粒度对测量强度的影响、光谱背景、元素间谱线重叠干扰和基体效应。在选定实验条件下,重复制样得到各元素的相对标准偏差均小于7.94%,对比试验结果表明,测定结果与认定值或化学法测定值相符,该方法能满足铝用炭素中微量元素分析的需要。     

Barrier Effect of Placenta Membrane of Pregnant Rat on Mixed Rare Earth Changle

MixedrareearthChangleisamixturecomposedofLa ,Ce ,Pr ,andNdnitrates ,inwhichcontentofCeisthemost .Ithasbeenwidelyusedasafeedad ditiveinanimalhusbandryinChina ,Thefactcuesthatalittlerareearthnitratemaygraduallyenterhu manbodywithconsumptionoffood ,furthermorerareearthnitratecannotbeexcretedcompletelywhilecanbeaccumulatedintheliver ,spleenandbone[1] ,theincreasingaccumulationiswithlongertime ,thereforeitisveryimportantthatsafetyofrareearthsnitrateisassessed .Therelationshipbetweenapplieddosean…     

冶金科技英才

龙红明,男,1979年8月生,湖北省嘉鱼县人,中共党员,博士,教授,安徽工业大学冶金工程系主任,炼铁新技术研究所副所长,安徽省学术和技术带头人后备人选,安徽省战略新兴产业领军人才,安徽省科学技术协会第九届委员,美国TMS学会会员,中国金属学会青年委员会委员,全国非高炉炼铁学术委员会委员,全国中小高炉学术委员会委员。     

塑性加工变形物理场研究的发展趋向

发生物理现象的空间部分,称为物理场。根据这个定义塑性加工时的变形区称为塑性加工变形物理场。塑性变形过程中,由开始到终了,矢量参数(位移,变形,应力,速度等),标量参数(温度,密度,体积,硬度,屈服极限,强度极限,位错密度,金属组织的主体相与剩余相的尺寸等)、各种系数(变形系数,晶粒尺寸比值,延伸率,断面减缩率,     

A model for integrating fixed-, random-, and mixed-effects meta-analyses into structural equation modeling.

Meta-analysis and structural equation modeling (SEM) are two important statistical methods in the behavioral, social, and medical sciences. They are generally treated as two unrelated topics in the literature. The present article proposes a model to integrate fixed-, random-, and mixed-effects meta-analyses into the SEM framework. By applying an appropriate transformation on the data, studies in a meta-analysis can be analyzed as subjects in a structural equation model. This article also highlights some practical benefits of using the SEM approach to conduct a meta-analysis. Specifically, the SEM-based meta-analysis can be used to handle missing covariates, to quantify the heterogeneity of effect sizes, and to address the heterogeneity of effect sizes with mixture models. Examples are used to illustrate the equivalence between the conventional meta-analysis and the SEM-based meta-analysis. Future directions on and issues related to the SEM-based meta-analysis are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

新马尔科夫模型的黄金价格短期预测

对黄金价格建立了ARMA-马尔科夫预测模型,该模型将数据统计特征与灰色理论密切结合。ARMA部分用来揭示预测序列的线性变化趋势,而马尔科夫状态转移概率矩阵用来确定状态转移的规律。实证研究表明,该模型预测精度优于ARMA模型以及灰色马尔科夫模型的预测精度。     

Testing the race model inequality in redundant stimuli with variable onset asynchrony.

In speeded response tasks with redundant signals, parallel processing of the signals is tested by the race model inequality. This inequality states that given a race of two signals, the cumulative distribution of response times for redundant stimuli never exceeds the sum of the cumulative distributions of response times for the single-modality stimuli. It has been derived for synchronous stimuli and for stimuli with stimulus onset asynchrony (SOA). In most experiments with asynchronous stimuli, discrete SOA values are chosen and the race model inequality is separately tested for each SOA. Due to the high number of statistical tests, Type I and II errors are increased. Here a straightforward method is demonstrated to collapse these multiple tests into one test by summing the inequalities for the different SOAs. The power of the procedure is substantially increased by assigning specific weights to SOAs at which the violation of the race model prediction is expected to be large. In addition, the method enables data analysis for experiments in which stimuli are presented with SOA from a continuous distribution rather than in discrete steps. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

连铸小方坯热应力模型的研究

建立了连铸小方坯二维传热数学模型及热弹塑应力频力模型，并用工厂 实际数据进行了验证，同时应用该模型分析了影响连铸小方坯热裂纹的因素，提高预防热裂纹产生的措施。     

黄金选矿数字孪生技术应用探索

随着工业互联网、大数据、人工智能等新一代信息技术与矿业领域传统工艺技术的不断融合发展,选矿流程数字化、智能化成为行业发展趋势.数字孪生技术与选矿工艺相结合建立数字仿真平台,将提升设备改进、流程优化、智能控制等在选矿全生产周期的应用效果.介绍了数字孪生技术在流程工业应用中的发展历史及趋势,以及不同数字化模型在黄金选矿流程...     

基于Surpac的矿床模型构建和资源储量估算——以冀北东坪金矿区转枝莲矿段为例

随着计算机技术的高速发展,"数字矿山"技术也日益成熟。基于Surpac软件,实现了矿体的三维可视化,建立了东坪金矿区转枝莲矿段地质数据库、三维地质模型和块体模型,并利用普通克里格法对金品位进行了估值,建立了矿体品位模型,同时进行了储量对比分析。分析结果表明,采用Surpac软件建立的模型可靠,估值精度较高,可为今后合理开发矿山资源提供科学依据。     

Using multilevel analyses with sibling data to increase analytic power: An illustration and simulation study.

This study investigates the extent to which analytic power can be increased through the inclusion of siblings in a data set and the concomitant use of random coefficient multilevel models. Analyses of real-world data regarding the predictors of young adult alcohol use illustrate how parallel single-level analyses of a 1-child-per-family data set and multilevel analyses of a data set including all siblings in each family would be conducted. A simulation study, closely based on the illustrative analyses, compares the empirical power to detect main, moderation, and mediation effects under three conditions: (a) single-level analyses of 1-child-per-family data, (b) multilevel analyses of all-siblings data, and (c) single-level analyses of independent data with sample size equivalent to the all-siblings condition. Supplementary analyses are conducted to determine the conditions under which greater analytic power could be achieved with the addition of siblings to a data set than with the addition of a lesser number of independent individuals at equivalent cost. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

COREX熔化气化炉区域模型及其理论燃烧温度

把熔化气化炉划分为炉缸区、风口区、填充床、流化床和自由空间5个区域。在已开发的COREX工艺整体静态模型的基础上,对各区域分别建立了物料平衡热平衡模型并联立求解。根据各区域内的物理化学进程设定各区域间边界的条件,模型计算可给出熔化气化炉内各区域的能量分布和物料流状况。利用区域模型还可计算喷煤对理论燃烧温度、炉缸渣铁温度、煤气量等的影响。     

冷轧连续退火炉工艺过渡数学模型研究

由于连续退火炉带钢工艺过渡频繁,而且带钢目标带温相差太大,利用现有模型无法控制,故提出了建立冷轧连续退火炉加热炉工艺过渡数学模型.工艺过渡模型主要包括带钢目标温度模型、静态模型、动态模型、动态自适应.目标温度模型计算工艺过渡某时刻的带钢目标温度;静态模型描述炉子温度和带钢温度的关系;动态模型描述板温偏差与煤气流量、干扰间的关系;动态自适应包括静态模型自适应和动态模型的自适应,利用递推最小二乘法来自学习模型系数,使实际带温响应快、稳定.从应用实例,分析了工艺过渡数学模型的使用效果.     

钢液连铸二次冷却先进工艺模型的发展与研究

 钢液连铸二次冷却的效果直接影响连铸坯质量,为了合理地控制二次冷却过程,多种静态和动态控制工艺模型被提出。系统综述了目前二冷静态和动态控制工艺模型的发展,包括二冷区各回路水量与拉速呈一次线性或二次曲线关系的二冷控制工艺模型、基于修正有效拉速的二冷动态控制工艺模型和基于在线传热计算的二冷动态控制工艺模型等,以及基于钢液过热度和二冷进水温度的二冷控制先进工艺模型和基于在线温度测量反馈调节各回路水量的二冷动态控制工艺模型。随着二冷控制工艺模型的发展,其控制的实时性、可靠性、准确性以及运行的稳定性也逐渐提高,从而为高质量铸坯生产及智能化二冷控制奠定了基础。