湘中锡矿山矿田稻草湾锑矿床的发现及地质意义

湘中锡矿山锑矿田是世界上已探明最大的锑矿集区。由于其开采时间长、深度大、资源保有量低,急需开展矿田深边部勘查找矿工作。近些年经过勘查在锡矿山矿田北东部新发现稻草湾锑矿床。通过其与锡矿山矿田典型矿床成矿特征对比,发现它们在控矿特征、赋矿地层、围岩蚀变以及矿石组成等方面均一致。同时对稻草湾锑矿床辉锑矿床进行电子探针分析,与锡矿山锑矿床辉锑矿对比,发现二者具有相似的辉锑矿主、微量元素组成。据此,本文提出新发现的稻草湾矿床为锡矿山锑矿田的一部分,认为其可以归属为锡矿山锑矿田的第五大矿床。该矿床的发现也揭示出锡矿山矿田具有良好的深边部找矿潜力。本文认为新发现的稻草湾锑矿床对进一步认识完善锡矿山锑矿田的成矿机制提供了新的方向,同时对指导区域找矿具有重要的意义。     

越南晋磨锑矿床稀土元素地球化学特征与成因探讨

对越南晋磨锑矿床赋矿围岩、矿化岩石和矿石的稀土元素地球化学特征研究表明,围岩的ΣREE明显高于矿化岩石和锑矿石,具有中度Eu负异常,矿石以明显的Ce负异常区别于围岩和矿化岩石,对比三者的稀土元素配分模式图,发现差异较大。类比锡矿山锑矿床、独山锑矿床成矿物质来源,结合矿区野外地质调查和稀土元素地球化学研究,认为晋磨锑矿床成矿物质与赋矿围岩无关,成矿物质可能来源于基底、幔源物质和隐伏岩体;成矿流体在运移过程中,由于物理化学环境的改变,辉锑矿在低压构造带或虚脱部位卸载,形成晋磨锑矿床。     

广西隆林县龙滩锑矿床地质特征与找矿标志

广西隆林县龙滩锑矿床是一个中型锑矿床，是桂西地区主要锑矿床类型之一。文章探究了广西隆林县龙滩锑矿床的成矿地质背景、矿床的地质特征及依据其成矿模式的找矿标志，对在桂西及邻近地区找寻同类型的锑矿床具有重要的指导意义。     

贵州半坡泥盆系碎屑岩型锑矿地质特征与成矿模式探讨

泥盆系是我国锑矿最重要的含矿层位.文章以独山锑矿大量的勘查与研究成果为基础,通过整理与综合分析成矿地质背景及矿床(点)地质特征,阐述了“锑”初始成生(即矿源层)的岩相古地理环境及后期改造富集成矿的因素和赋矿场所.论述了独山半坡泥盆系碎屑岩型锑矿床的地质特征、赋矿条件、锑矿床(点)类型及其规律,探讨了半坡泥盆系碎屑岩型锑矿床的成矿模式.     

河南大河沟—掌耳沟锑矿田地质特征及找矿潜力初评

大河沟—掌耳沟锑矿田位于我国重要锑成矿带之一的东秦岭北锑—汞矿带的东部。迄今为止,矿田内已发现中型锑矿床1个,小型锑矿床3个,锑矿点9个。作者在收集矿田以往勘查和科研资料成果的基础上,对成矿地质背景、矿床地质特征、地层的含矿性、硫同位素特征、矿物包裹体特征以及成矿环境等进行了分析,发现成矿受地层和构造双重控制作用明显,矿床(点)均产于古元古界秦岭群雁岭沟组中,矿体的分布严格受朱阳关—夏馆深大断裂及次一级构造的控制。因此,矿床的成因可归纳为与低温热液有关的层控矿床,即多成因—多阶段复合成因的层控矿床,具有广阔和良好的找矿前景。     

煌斑岩脉真是锡矿山锑矿田的东界吗?

在研究矿田及煌斑岩脉附近地区地质地球化学特征的基础上,认为煌斑岩脉不是锡矿山锑矿田的东界     

青城子外围块硫锑铅矿型金矿地质特征和找矿意义

块硫锑铅矿型金矿是一种新的金矿类型。通过对矿床地质特征、成矿规律及控矿因素的研究，认为块硫锑铅矿与金银关系密切，可作为金银找矿标志。     

四川木里向阳金多金属矿区地球化学特征及找矿远景浅析

向阳金多金属矿区位于木里县东朗乡向阳村,通过地质、化探测量、地表工程揭露、取样分析及综合分析研究,显示研究区成矿条件较好。通过区域地质地球化学特征、矿区地质地球化学特征初步的分析与研究,对该研究区内金锑矿床的成矿特征及找矿标志提出了一些认识,通过进一步勘查,有望在该地区找到品位富、规模大的金锑矿床。     

河南王庄锑矿床地质特征及构造控矿规律

位于东秦岭北锑-汞矿带上的王庄锑矿床,成矿严格受双槐树构造带控制。本文通过对该矿床的地质特征、控矿构造、矿体赋存部位等综合研究,发现工业锑矿体在双槐树构造带中分布有一定规律性,可分为带内构造控岩型、构造角砾岩型、糜棱岩型控矿,该认识对指导深部找矿及构造带内区域找矿预测具有一定的指导意义。     

贵州省三都县高尧锑矿矿化成因及找矿标志

贵州省三都县高尧锑矿处于贵州省雷公山锑矿带,雷公山地区已发现锑矿床(点)多处。本文阐述了高尧锑矿成矿地质背景、矿体地质特征、矿体围岩蚀变特征,对其成因及控矿因素进行了探讨,并对其找矿标志进行了总结。     

关于完善设计院生产经营管理体制的思考

在分析工程设计行业面临的形势和市场挑战的基础上,论述完善生产经营管理体制的必要性,并从市场开拓、经营模式、资源整合、人力资源、分配考核、社会保障、自主创新、服务意识、企业文化等方面采取措施,建立现代企业制度,完善生产经营管理体制.     

Influence of liming on metal sequestration in lake sediments over recent decades

Sediment profiles from five limed and six reference softwater lakes included in Swedish monitoring programmes were subjected to multi-element analysis to investigate the influence of lime treatment since 1977 on the sequestration of metals in lake sediments. We hypothesised that liming causes increased sedimentation of elements for which the mobility is primarily controlled by pH, e.g. Al, Cd, Co, Ni and Zn, whereas elements that are less influenced by pH fluctuations, e.g. Hg and Pb, are not affected by lime treatment. Further, we introduce a normalisation of metal concentrations with respect to Cu concentration in order to separate the effects of lime treatment from those related to temporal trends in airborne metal deposition or short-term variations in environmental conditions. This approach is shown to emphasise the effect of liming on the sediment accumulation of metals, thus separating it from other sources of variability. We found that liming causes increased sequestration of Al, As, Cd, Co, Fe, Mn, Ni and Zn, in the case of As and Co probably at least partly caused by an increased adsorption to Al, Fe and Mn oxyhydroxides. On the other hand, no influence of lime treatment could be demonstrated for Hg, Pb, Cr, V and P, despite an increase of pH by about two units.     

Comparison of anthropological and “natural” input of substances through waters into Adriatic, Baltic and Black Sea

BOD₅, COD, total suspended solids, total nitrogen, phosphates, surface active substances, detergents, mineral oils, phenols, PAH, Zn, Ni, Cr, Mn, Cu, Pb, Cd and Hg annual loading for the Adriatic Sea, Baltic Sea and Black Sea through wastewater and “natural” waters have been estimated. The quantities of “natural” waters, which are several orders of magnitude higher than the anthropological ones, the expected “natural” loading of substances considered here highly exceeds annually, weak reflections on the natural concentration increase in the whole sea system have been observed. This is essentially due to enormous quantities of suspended matter, and highest pollution is registered in the narrowest littoral zone. The present pollution has ecological implications primarily on the enchanted point-source spots. Comparison of the results for these closed seas reveals that the Adriatic sea has the smallest loading taken absolutely and relatively considering its volume, while the Black Sea, and particularly the Baltic Sea, have significantly higher loading.     

From flaws to faults

With the increasing use of the structural reliability theory in the current analysis and design of future structures and in the assessment of the existing structures defectologic problems are arising. Though in other areas of engineering, e.g. in mechanical and electrical engineering, defectologic terminology is well developed, in structural engineering problems with the definitions of such terms as flaw, deterioration, damage, defect, failure, fault, and others are often encountered.     

Excessive software development: Practices and penalties

This study focuses on the tendency to develop software excessively, above and beyond need or available development resources. The literature pays little attention to this issue, overlooking its crucial impact and penalties. Terms used in reference to excessive software development practices include over-requirement, over-specification, over-design, gold-plating, bells-and-whistles, feature creep, scope creep, requirements creep, featuritis, scope overload and over-scoping. Some of these terms share the same meaning, some overlap, some refer to the development phase, and some to the final system. Via a systematic literature search, we first demonstrate the poor state of research about excessive software development practices in the information systems and project management areas. Then, we suggest a framework consolidating the problems associated with excessive software development in three ‘beyond’ categories (beyond needs, beyond resources, beyond plans), describe and analyze their causes, consequences, boundaries and overlapping zones. Finally, we discuss the findings and present directions for future research.     

Wild Ways and Paths of Pleasure: access to British waterfalls, 1500-2000

In Britain the rise of tourism, largely associated with the Romantic taste for landscape, encouraged travel to relatively inaccessible areas. Among travellers in search of the picturesque and the sublime, waterfalls were particularly popular, but these were commonly difficult and dangerous places to visit. The impact of tourism on the evolution of the landscape at waterfall sites over a period during which people travelled to tourist centres on horseback, by coach, by rail and by motor vehicle is examined. Drawing on topographical, travel and tourist literature from the sixteenth century to 2000, together with extensive field observation, the evolution from the 'natural' to the designed landscape, created to meet the needs of, and to attract, visitors, is considered. It is demonstrated how, while facilitating visits to natural attractions such as waterfalls, improved access and the provision of amenities have changed valued landscapes and, hence, the visitor's experience of them.     

The performance of moss, grass, and 1- and 2-year old spruce needles as bioindicators of contamination: a comparative study at the scale of the Czech Republic

Moss (Pleurozium schreberi), grass (Avenella flexuosa), and 1- and 2-year old spruce (Picea abies) needles were collected over the territory of the Czech Republic at an average sample density of 1 site per 290 km². The samples were analysed for 39 elements (Ag, Al, As, Ba, Be, Bi, Ca, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Hg, K, La, Li, Mg, Mn, Mo, Na, Nd, Ni, Pb, Pr, Rb, S, Sb, Se, Sn, Sr, Th, Tl, U, V, Y and Zn) using ICP-MS and ICP-AES techniques (the major nutrients Ca, K, Mg and Na were not analysed in moss). Moss showed by far the highest element concentrations for most elements. Exceptions were Ba (spruce), Mn (spruce), Mo (grass), Ni (spruce), Rb (grass) and S (grass). Regional distribution maps and spatial trend analysis were used to study the suitability of the four materials as bioindicators of anthropogenic contamination. The highly industrialised areas in the north-west and the far east of the country and several more local contamination sources were indicated in the distribution maps of one or several sample materials. At the scale of the whole country moss was the best indicator of known contamination sources. However, on a more local scale, it appeared that spruce needles were especially well suited for detection of urban contamination.     

前沿信息技术在装配式建筑建设管理中的应用研究

为解决装配式建筑建设管理过程中面临的设计信息缺乏互操作性、信息传递缺乏时效性、装配过程缺乏精准性以及大数据管理等难题,提出将建筑信息模型、P-BIM、无线射频识别技术、北斗定位技术、云技术应用于装配式建筑建设管理中。以期实现装配式建筑设计信息无缝对接,设计、生产、运输、装配全过程实时信息的可视化和实时监控管理,预制构件装配精准化,城市大规模装配式建筑群大数据的互通与管理,从而提升装配式建筑的建设管理水平。     

Deposition of airborne elements from Sembule steel mill surveyed by moss analysis

The local contamination of airborne elements caused by the Sembule steel works was studied by the analysis of Mg, Ca, Fe, Ni, Pb and Cd accumulated in transplanted moss. The concentrations of heavy metals (Fe, Ni, Pb, Cd) and other elements (Mg, Ca) were determined in soil, moss and water collected in the vicinity of Sembule steel mill. Comparison of elemental ratios indicate that there is contamination by heavy metals around this area. Accumulation coefficients have been applied to moss, soil and water data in an attempt to work out the contribution of these elements to water via soil and air. In evaluating Fe, Ni, Pb and Cd contents of river water and soil, a distinction was made between the amounts which are taken up from soil and those reaching the water as air depositions (as measured by use of moss). The calculations indicate that soil contributes 79.4, 96.3, 23.3, 0.50, 14.6 and 30.6 percent of Mg, Ca, Cd, Pb, Ni and Fe, respectively, whereas air deposition contributes 20.6, 3.73, 76.7, 99.5, 85.4 and 69.4 percent, respectively.     

Investigations of basic soil parameters in mersin: Kozlar high plateau of south Turkey

Basic soil parameters of Kozlar high plateau in Mut (Mersin) have been investigated. Soil samples were collected from the eroded, maquis and forest habitats of the research area in January, October, April and July between 2000 and 2002. The average values for soil moisture, CaCO₃, saturation percentage, field capacity, salinity, conductivity, pH, total carbon and total nitrogen were found in the range of 4.0–19.7%, 25.0–33.3%, 39.7–72.1%, 22.0–56.0%, 0.027–0.074 dS/m, 0.80–1.2 μS/cm, 7.5–8.1, 0.82–5.50%, and 0.10–0.58%, respectively. Generally, despite no significant differences among the soil parameters of the three habitats, only three parameters, saturation percentages, amount of total carbon and of carbon mineralization differed significantly.