Phase Transition Study of Thermal Dependence of Soft Mode Frequency,Dielectric Constant and Dielectric Tangent Loss Properties in CsH2PO4 (CDP) and CsD2PO4 (DCDP) Crystals

Journal of Low Temperature Physics - Modified two-sublattice pseudospin lattice coupled-mode (PLCM) model Hamiltonian by adding third- and fourth-order anharmonic interactions, extra...     

地震作用对采空区塌陷的UDEC模拟

采空区的稳定性问题除了岩体强度、节理、裂隙、层面等地质缺陷自身的因素外,地震、爆破、地下水等外界的因素也不容忽视.本文利用离散元软件UDEC模拟了地震波对天德石膏矿采空区塌陷的影响,分析了节理围岩在地震波作用下的运动情况,指出地震波的作用是采空区产生塌陷的诱发因素.     

巴里新尾矿库泥石流灾害隐患治理

概述了巴里新尾矿库设计及使用概况,阐述了这一山谷型尾矿库泥石流灾害隐患形成的条件,针对库区流域地质构造及环境地质条件及实际情况,分析了库区发生泥石流灾害的可能性及规模,并提出了库区泥石流灾害隐患治理方案和最终治理目标.通过两年多的施工,最终消除了巴里新尾矿库泥石流灾害隐患,达到了灾害治理的目的,为类似企业进行地质灾害环...     

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.     

Thermochemical processing of copper-molybdenum concentrates

Results are presented from a study of thermochemical processing of copper-molybdenum concentrates by liquation smelting, which concentrates the rock-forming and ore components selectively in immiscible liquid phases. Optimal conditions for liquation smelting have been determined, under which the extraction of molybdenum amounts to 80%, copper and bismuth 95% and 100%, respectively. Buryat Institute of Natural Sciences, Siberian Branch, Russian Academy of Sciences, Ulan-Ude. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 101–103, January–February, 1999.     

Filtering method for SAR interferograms with strong noise

We develop a filtering method for SAR interferograms with strong noise based on the concept of the Vondrák filter and the commonly used Goldstein filter. The one‐dimensional Vondrák filter is first extended to two dimensions, and then utilized to smooth the Fourier spectra of overlapped interferogram patches. The smoothed spectra are then back‐transformed into the interferogram space. Experimental results with simulated and real datasets show that the proposed filter can eliminate up to 70% of noise in a SAR interferogram. The results also show a 15% to 35% improvement over some of the existing filters when the noise in an interferogram is strong, and the stronger the noise in an interferogram, the greater is the improvement.     

铅侧吹氧化熔炼过程热力学模拟与优化

使用FactSage软件,对铅侧吹氧化熔炼过程进行热力学模拟,计算的平衡相组成与实际产出情况相吻合,验证了热力学分析的可行性。考察了氧料比、熔炼温度对元素在各平衡相中分配比的影响。研究结果表明,提高氧料比,铅、铜等有价元素进入高铅渣的比例,炉料的脱硫效果更好,但铅液杂质含量也会相应增大;提升熔炼温度,对降低渣含硫及提高粗铅品位更有利,但较高的温度会加剧铅、锌等有价元素的挥发。利用宏过程进行批量平衡计算,以实现过程优化控制。在粗铅及高铅渣的质量达到期望值的条件下,综合考虑有价元素直收率及烟尘率,对该工艺进行了优化。建议铅侧吹氧化熔炼过程中氧料比控制在124 m3/t,熔炼温度控制在1 067 ℃左右。      

Statistical analysis of astronomical papers of China during 1986–1990

We present the distribution of astronomical papers published by Chinese authors in 1986–1990 across the various subfields of astronomy, the total number of papers produced by each observatory or university during the five years, and the ranking of the observatories by productivity. Our main data base includes 24 journals: 9 foreign ones published in English, 10 Chinese national ones, and 5 Chinese observatory publications. About 70 journals published by Chinese universities have also been consulted. This data base covers up to 90% of all astronomical papers published during this period.     

广西大厂矿田大福楼锡多金属矿床地质与地球化学特征

位于大厂矿田东带的大福楼锡矿床是一个以产锡和锌为主、研究程度相对较低且规模较大的锡石硫化物型矿床。针对该矿床特征典型、研究薄弱、成矿条件优越及找矿前景可观等因素,对流体包裹体和硫同位素特征进行了研究。结果表明:大福楼矿床主要发育6种类型的流体包裹体(单相气相包裹体、单相盐水溶液包裹体、两相富蒸汽包裹体、两相富液体包裹体、含CO2相包裹体和含NaCl子矿物包裹体),包裹体大小一般为5～25μm,少数为30μm,主要呈多边形、米粒状、椭圆形、长方形以及不规则状,少数呈三角形以及半自形的负晶形。包裹体主要含Ca2+、Mg2+、K+、Na+、SO42-、Cl-和NO3-等液相成分以及CO2、CO、CH4和N2等气相成分。成矿流体属于Na(K)-Ca(Mg)-Cl型卤水溶液,呈弱酸性,包裹体中不含O2,表明成矿过程中没有游离氧的存在,而CO2、CH4和H2的含量相对较高,表明成矿流体具有较强的还原性。矿物中含NaCl子矿物包裹体的大量存在,显示成矿流体具有岩浆热液特征。包裹体中的氟对锡的迁移和沉淀起着非常重要的作用,而硫盐矿物的存在可能对锡的富集沉淀造成不利影响。硫同位素研究结果显示,矿石的δ(34S)值为-1.54×10-3～2.18×10-3,极差为3.72×10-3,均值为1.141×10-3,以正值为主,矿石δ(34S)值稍微偏离基性岩类硫的范围,而与陨石硫的同位素组成非常接近,具有重硫富集和典型岩浆来源的特征。锡矿硫元素可能部分来源于龙箱盖隐伏复式花岗岩体,显示     

长坡选矿厂生产工艺技术改造实践

针对长坡选矿厂所处理矿石品位低、粒度细且部分呈浸染状分布、原有前面重选单室跳汰机处理能力小、粗粒尾矿丢废率低、丢尾金属品位较高且硫化矿部分氧化的情况,采取更换跳汰机、取消枱浮系统、完善矿浆浓缩设施等改造措施,不仅降低了选矿成本,而且锡、铅锑、锌的回收率分别提高了3.07、4.84、6.12个百分点.