宁夏二人山银铅矿床成矿流体地球化学特征及演化

宁夏卫宁北山地区二人山银铅矿是宁夏境内最典型、规模最大的银铅锌多金属矿床,矿体主要赋存于F18构造破碎带中。通过对与矿化密切共生的重晶石中的流体包裹体岩相学及显微测温分析,H2O-CO2三相包裹体均一温度为107℃～287℃,盐度变化范围为0.41%～12.05%;CO_2三相包裹体均一温度为30.2℃;富液体包裹体均一温度为95℃～248℃,盐度为2.07%～23.18%。成矿流体具有中低温、中高盐度的特征,流体为SiO_2-H_2O-CO_2-SO_4^(2-)多相含矿(Zn(2-)多相含矿(Zn⁽²⁺⁾、Pb(2+)、Pb⁽²⁺⁾、Fe(2+)、Fe⁽³⁺⁾和Ag(3+)和Ag⁺等)。     

老挝帕奔金矿床同位素地球化学特征

对矿床热液成矿期含金方解石中H、O、C稳定同位素测定,探讨主成矿期成矿流体和成矿物质来源,为深入研究帕奔金矿成矿机制、成矿作用提供了新的地球化学资料。含金方解石碳氧同位素⁽¹³⁾C_(V-PDB)值分布在-4.5‰(13)C_(V-PDB)值分布在-4.5‰^-5.2‰之间,-5.2‰之间,⁽¹⁸⁾O_(V-SMOW)值分布于20.0‰(18)O_(V-SMOW)值分布于20.0‰²0.8‰之间,含金的方解石矿物来源为流体与二叠纪海相碳酸盐岩相互作用产物;含金方解石矿物中包裹体水的δD值在-49‰20.8‰之间,含金的方解石矿物来源为流体与二叠纪海相碳酸盐岩相互作用产物;含金方解石矿物中包裹体水的δD值在-49‰^-92‰之间,δ-92‰之间,δ⁽¹⁸⁾O-H_2O的范围为8.32‰(18)O-H_2O的范围为8.32‰¹3.42‰,成矿流体来源与岩浆活动存在密切关系。     

游三国,学数学(连载十六)

<正>第十六回曹冲的独门兵器(根三)——立方根次日,兄弟三人如约而至,并一齐拿出答案,只见三人的答案都是:1.(1)有理数:-(2/5)²,3.14159,((-7)2,3.14159,((-7)²)2)^(1/2),1/7,2.95(2)无理数:π,3.131331333133331…(每两个"1"之间依次多一个"3"),-(10(1/2),1/7,2.95(2)无理数:π,3.131331333133331…(每两个"1"之间依次多一个"3"),-(10^(1/2))(3)负实数:-(10(1/2))(3)负实数:-(10^(1/2))2.(1)是错误的,举例:-(2(1/2))2.(1)是错误的,举例:-(2^(1/2))+2(1/2))+2^(1/2)=0(2)是错误的,举例:2(1/2)=0(2)是错误的,举例:2^(1/2)×2(1/2)×2^(1/2)=2     

渤海金州湾放流海域中国明对虾生长特性研究

为研究渤海金州湾海域放流中国明对虾Fenneropenaeus chinensis的生长特性,于2016年7—10月共计回捕中国明对虾2195尾,并对其头胸甲长(L_T)、体长(L_t)及体质量(W_t)进行测量和分析。结果表明:中国明对虾头胸甲长与体长呈线性关系,即雌虾L_t=2.8737L_T+28.905 (R²=0.8914),雄虾L_t=3.067 L_T+22.209 (R2=0.8914),雄虾L_t=3.067 L_T+22.209 (R²=0.8427);体长与体质量成幂函数关系,即雌虾W_t=0.546402×102=0.8427);体长与体质量成幂函数关系,即雌虾W_t=0.546402×10^(-5)L_t(-5)L_t^(3.131265)(P=2.2×10(3.131265)(P=2.2×10^(-16)),雄虾W_t=1.180508×10(-16)),雄虾W_t=1.180508×10^(-5)L_t(-5)L_t^(2.969245)(P=2.2×10(2.969245)(P=2.2×10^(-16));采用Von Bertallanffy生长方程拟合体长、体质量的生长方程,即雌虾L_t=220.2139×[1-e(-16));采用Von Bertallanffy生长方程拟合体长、体质量的生长方程,即雌虾L_t=220.2139×[1-e^{(-0.018(t-52.4)})]、W_t=118.4623×[1-e(-0.018(t-52.4))]、W_t=118.4623×[1-e^{(-0.018(t-52.4)})](-0.018(t-52.4))]^(3.131265),雄虾L_t=153.5412×[1-e(3.131265),雄虾L_t=153.5412×[1-e^{(-0.0409(t-59.71)})]、W_t=36.6021×[1-e(-0.0409(t-59.71))]、W_t=36.6021×[1-e^{(-0.0409(t-59.71)})](-0.0409(t-59.71))]^(2.969245);体长、体质量生长速度方程,雌虾dL_t/dt=3.9639e(2.969245);体长、体质量生长速度方程,雌虾dL_t/dt=3.9639e^{(-0.018(t-52.4)})、dW_t/dt=6.6769e(-0.018(t-52.4))、dW_t/dt=6.6769e^{(-0.018(t-52.4)})[1-e(-0.018(t-52.4))[1-e^{(-0.018(t-52.4)})](-0.018(t-52.4))]^(2.131265),雄虾dL_t/dt=6.2798e(2.131265),雄虾dL_t/dt=6.2798e^{(-0.0409(t-59.71)})、dW_t/dt=4.445e(-0.0409(t-59.71))、dW_t/dt=4.445e^{(-0.0409(t-59.71)})[1-e(-0.0409(t-59.71))[1-e^{(-0.0409(t-59.71)})](-0.0409(t-59.71))]^(1.969245)。研究表明:雌虾与雄虾的体长和体质量在生长过程中表现出明显差异,在体质量生长方面,雌虾体质量生长拐点是115.8 d(约8月29日),雄虾体质量生长拐点是86.3 d(约7月30日),此时中国明对虾仍处于生长期;建议今后在渤海海域可适当延后开捕时间,以期实现资源的最大利用。     

离子色谱法测定大同市辖区饮用水中4种阴离子

应用离子色谱法检测大同辖区水源水、末梢水及出厂水中的F^-、Cl-、Cl^-、NO_3-、NO_3^-、SO_4-、SO_4^(2-)4种阴离子,以3.5 mol/L的Na_2CO_3和1.0 mol/L的Na HCO_3溶液为淋洗液,等度洗脱。采用戴安ICS1100离子色谱仪及Ion Pac AS14分离柱,流量为1.2 m L/min。4种离子的质量浓度与其色谱峰面积呈良好的线性关系,相关系数为0.999 14(2-)4种阴离子,以3.5 mol/L的Na_2CO_3和1.0 mol/L的Na HCO_3溶液为淋洗液,等度洗脱。采用戴安ICS1100离子色谱仪及Ion Pac AS14分离柱,流量为1.2 m L/min。4种离子的质量浓度与其色谱峰面积呈良好的线性关系,相关系数为0.999 14⁰.999 99,检出限为0.10.999 99,检出限为0.1⁰.4μg/m L,加标回收率均为98.3%0.4μg/m L,加标回收率均为98.3%¹03.8%,测定结果的相对标准偏差为0.2088%103.8%,测定结果的相对标准偏差为0.2088%⁵.0873%。该方法测定结果准确可靠,并且操作简便快捷,一次进样可同时测定多种阴离子,适用于水中F5.0873%。该方法测定结果准确可靠,并且操作简便快捷,一次进样可同时测定多种阴离子,适用于水中F^-、Cl-、Cl^-、NO_3-、NO_3^-、SO_4-、SO_4^(2-)的测定。     

游三国,学数学(连载十五)

<正>第十五回三兄弟团聚——实数话说,张飞与赵云顺利回到了营地,他们将在曹营的所见所闻仔仔细细地向刘备、诸葛亮做了汇报。张飞还解答出了曹冲最后留下的问题:"商n"能走出根号。(n(n/(n²-1)))2-1)))^(1/2)=(n(n/(n(1/2)=(n(n/(n²-1)))2-1)))^(1/2)(n为大于1的正整数),理由是:(n(n/(n(1/2)(n为大于1的正整数),理由是:(n(n/(n²-1)))2-1)))^(1/2)=((n(n(1/2)=((n(n²-1)+n)/(n2-1)+n)/(n²-1))2-1))^(1/2)=((n(1/2)=((n³-n+n)/(n3-n+n)/(n²-1))2-1))^(1/2)=(n(1/2)=(n³/(n3/(n²-1))2-1))^(1/2)=((n(1/2)=((n²×n)/(n2×n)/(n²-1))2-1))^(1/2)=n(n/n(1/2)=n(n/n²-1)2-1)^(1/2).赵云也熟练地解答出了     

高位池精养日本囊对虾的生长规律

对高位池精养日本囊对虾Marsupenaeus japonicus的体长和体质量进行跟踪测量,研究其生长特性及其规律。结果表明:日本囊对虾的体长和体质量呈幂函数关系,即W=1.182×10-5L3.0235,b接近于3,呈等速生长。其生长分为快速生长期(30⁶0日龄)、稳定生长期(6060日龄)、稳定生长期(60⁹0日龄)和缓慢生长期(9090日龄)和缓慢生长期(90¹30日龄)3个时期。生长早、中期(50130日龄)3个时期。生长早、中期(50⁹0日龄)肥满度逐渐升高(1.1490日龄)肥满度逐渐升高(1.14¹.23),趋势显著,之后呈显著下降趋势(1.191.23),趋势显著,之后呈显著下降趋势(1.19¹.14)。拟合出日本囊对虾的von Bertallanffy生长方程为:Lt=111.796×[1-e-0.0123(t+0.07654)],Wt=15.611×[1-e-0.0123(t+0.07654)]3.0235,体质量生长拐点出现在89.9 d。     

安徽省区域铀矿化特征探讨

本文依据赋矿主岩和岩浆活动对铀矿的成矿作用,将安徽省内铀矿化类型划分为碱性岩型、花岗岩型、碳硅泥岩型、砂岩型、火山岩型、变质岩型及伟晶岩型七大类型。根据具体含矿岩性、成矿作用和成矿环境异同,将七大类型细分成14个亚类型。按矿体产出部位对安徽省内主要铀矿类型的碱性岩型外带亚型划分为接触带-断裂-岩性层控式(丁家山式)、砂岩残留体式(大龙山式)两个成矿式。安徽省内铀矿化主要分布在金寨-西汤池铀成矿远景带、沿江铀成矿远景带及广德-屯溪铀成矿远景带三条铀成矿带上,其中沿江铀成矿远景带是安徽省内重要的铀成矿带。     

鄂拉山地区中下三叠统洪水川组沉积体系分析

通过兴海五幅区域地质矿产调查工作,查明区内中-下三叠统洪水川组(T_(1-2)h)可分为三段,分别为:砾岩段(T_(1-2)h1)、砂岩段(T_(1-2)h²)和火山岩段(T_(1-2)h2)和火山岩段(T_(1-2)h³)。依据组合、成分、典型沉积结构构造等特征,将洪水川组沉积体系自下而上划分为扇三角洲沉积体系、浅海-半深海浊流沉积体系、半深海-深海沉积体系。     

云冈石窟区域水样中的阴离子测定

本文建立了离子色谱法测定云冈石窟窟区水样中阴离子的方法。采用戴安Ion Pac AS14阴离子柱(4×250 mm)分离,以3.5 mmol/L Na_2CO_3-1.0 mmol/L NaHCO_3混合溶液为流动相,流速为1.2mL/min。在最佳色谱条件下,4种阴离子F^-、Cl-、Cl^-、NO_3-、NO_3^-和SO_4-和SO_4^(2-)于15 min内完全分离,且各阴离子的峰面积和浓度之间有良好的线性关系,线性相关系数r>0.9990,F(2-)于15 min内完全分离,且各阴离子的峰面积和浓度之间有良好的线性关系,线性相关系数r>0.9990,F^-、Cl-、Cl^-、NO_3-、NO_3^-、SO_4-、SO_4^(2-)的RSD分别为0.49%、0.91%,0.60%,1.41%。根据水样测试结果进行水循环化学特征分析,为云冈石窟文物保护工作提供基础数据的支持。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

2005年北京办公物业市场七大趋势

趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03～04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中…     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.