贵州三都高洞锑矿地质特征及电法物探应用     

刘道明  周玲玲  刘翔  冯琳 《贵州地质》2012,29(3):183-187

采用瞬变电磁法及大功率激电测量在三都高洞锑矿区圈定出5个锑异常带,结合该区成矿地质条件及锑矿床类型,将5个锑异常带划定为找矿靶区,通过钻探及坑道验证,在Ⅰ、Ⅱ、Ⅲ三个锑异常带内共揭露出三个锑矿体。表明利用地球物理勘探方法在该区找矿效果十分明显。  相似文献   

某低品位铁矿中铁钛元素赋存状态研究     

王兵  谭靖  孟昌中  邓强  陈靖  杨林 《贵州地质》2012,29(3):229-234,240

以电子探针(EPMA)为主要研究手段,结合常规化学分析、化学物相分析、透反射显微镜研究,对黔西北某地低品位铁矿中铁—钛的赋存状态进行了详细研究。研究结果表明,矿石中铁主要以褐铁矿形式存在,少量以赤铁矿产出。载铁矿物与粘土矿物常常混杂出现,分布不均,团块大小差异也大,矿物间的嵌布关系复杂;钛在矿石中一是以微细粒的独立矿物金红石、锐钛矿、钛铁矿与脉石矿物相互混杂分布,另一种则是蚀变残留于褐铁矿中类质同象的钛。根据铁、钛赋存特征研究结果,对该矿石提出了"分散—絮凝—磁选"分离预富集铁—钛矿物、"直接还原法"实现铁钛分离的工艺建议。  相似文献   

Occurrence of Sn-Bearing colusite in the ore-body “T” of the Bor copper deposit, Serbia     

Ljubomir Cvetković  Aleksandar Pačevski  Trajče Tončić 《Geology of Ore Deposits》2013,55(4):298-304

The ore body “T” is the newly discovered massive-pyrite type one which is located in the central part of the Bor copper mine. The main copper minerals are chalcocite-digenite, covellite and enargite. Small amounts of colusite are frequently present in the ore-body. It mostly occurs as the distinct exsolutions in digenite and, associating with enargite and covellite. Composition of the studied colusite shows enriched Sn content, giving an empirical formula from Cu_24.7V_1.8Fe_0.2As_5.1Sb_0.2Sn_0.8S₃₂ to Cu_26.7V_2.0Fe_0.3A_s3.0Sb_0.3Sn_3.5S₃₂. This colusite represents a solid solution between colusite and nekrasovite within a range of 14–54 mol % nekrasovite. Most of the analyses show content of <50 mol % nekrasovite corresponding to the Sn-bearing colusite variety, while one analysis shows content of 54 mol % nekrasovite corresponding to the As-bearing nekrasovite.  相似文献   

Full‐scale Applications of Membrane Filtration in Municipal Wastewater Treatment Plants     

Marek Holba  Karel Plotěný  Lukáš Dvořák  Marcel Gómez  Iveta Růžičková 《洁净——土壤、空气、水》2012,40(5):479-486

The performance of one pilot‐scale and two full‐scale membrane bioreactors (MBR) were evaluated based on the control of main operational parameters, composition of microbial community and pathogens concentration in the treated outlet. Plants were designed for 0.75 m³/day (A), 60 m³/day (B) and 30 m³/day (C). Inlet and outlet samples were monitored for chemical oxygen demand (COD), biological oxygen demand, total suspended solids, ammonia nitrogen concentration (NH₄–N), nitrate nitrogen concentration, total Kjeldahl nitrogen, total phosphorus and phosphate phosphorus concentration concentrations. Plants showed good COD removal: 91.9% for Plant A, 97.8% for Plant B and 94.2% for Plant C. The targeted nitrogenous ion was NH₄–N due to the requirements for outlet limits. NH₄–N removal was moderate for Plant A (73.3%) and Plant B (86.1%) and excellent for Plant C (>99%). Excellent phosphorus removal was achieved by Plant A (average outlet concentration was 0.7 mg/L, efficiency 84.7%). Unsatisfactory results for phosphorus removal were achieved at the full‐scale plants due to operational problems. The dependency between the extracellular polymeric substances increase and decreasing mixed liquor volatile suspended solids for both lab and full‐scale plants was confirmed. Soluble microbial product concentrations were reduced by 65–68% after coagulant dosage for Plant A. Outlets from the MBR plants were monitored for the presence of pathogens (thermotolerant coliforms, Escherichia coli, intestinal Enterococci and culturable microorganisms at 22 and 37°C). The treated effluent from Plant A, B and C met Czech national legislation regarding reuse criteria (standards) for environment, irrigation and swimming purposes. Plants B and C were not able to achieve requirements for potable water and personal hygiene quality standards.  相似文献   

跋     

&#  &#  &#  &#  &#  &#  &#  &# 《气候与环境研究》2012,17(6):991-991

本专辑不是对我国人工增雨研究和作业的全面总结, 只是应时急组编就之。我国既已有了在全世界最大范围的人工增雨的作业, 今又酝酿了进一步使之科学化的规划, 我们不胜欣喜, 故欲尽绵薄力量以作一点贡献。但限于时间的急促和我们的见闻十分有限, 并且只作了有限的调查和约稿, 故本专辑所刊登诸文只是我国众多研究经验很小的一部分, 敬请读者和从事该项事业的广大同仁见谅。十分希望广大同仁能将好的研究结果和好的经验用各种方式告知我们, 或直接投稿, 我们将十分感激。如蒙不弃, 且有可能和需要的话, 我们拟在今后续编此专题的专辑。    相似文献   

Degradation of Triton X‐100 in Water Falling Film Dielectric Barrier Discharge Reactor          下载免费PDF全文

Munera M. Aonyas  Jelena Nešić  Milica Jović  Marijana Marković  Biljana Dojčinović  Bratislav Obradović  Goran M. Roglić 《洁净——土壤、空气、水》2016,44(4):422-429

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Stability of rubble-mound breakwater using H₅₀ wave height parameter     

Amir Etemad-Shahidi  Meysam Bali 《Coastal Engineering》2012,59(1):38-45

The prediction of rubble mound breakwaters' stability is one of the most important issues in coastal and maritime engineering. The stability of breakwaters strongly depends on the wave height. Therefore, selection of an appropriate wave height parameter is very vital in the prediction of stability number. In this study, H₅₀, the average of the 50 highest waves that reach the breakwater in its useful life, was used to predict the stability of the armor layer. First, H₅₀ was used instead of the significant wave height in the most recent stability formulas. It was found that this modification yields more accurate results. Then, for further improvement of the results, two formulas were developed using model tree.To develop the new formulas, two experimental data sets of irregular waves were used. Results indicated that the proposed formulas are more accurate than the previous ones for the prediction of the stability parameter. Finally, the proposed formulas were applied to regular waves and a wide range of damage levels and it was seen that the developed formulas are applicable in these cases as well.  相似文献   

Daily reference evapotranspiration modeling by using genetic programming approach in the Basque Country (Northern Spain)     

Jalal Shiri  Özgur Kişi  Gorka Landeras  José Javier López  Amir Hossein Nazemi  Louis C.P.M. Stuyt 《Journal of Hydrology》2012

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Predicting summer hypoxia in the northern Gulf of Mexico: redux   总被引：1，自引：0，他引：1  

Turner RE  Rabalais NN  Justić D 《Marine pollution bulletin》2012,64(2):319-324

We report on the evolution and accuracy of a model used to predict the mid-summer area of hypoxia (oxygen ≤2 mg l(-1)) in the northern Gulf of Mexico, use it to test for impacts from the Deepwater Horizon oil spill (2010), and estimate the N loading that would meet a management goal. The prediction since 2000 were 100%±6% (μ±1 SE) of the actual value. The predicted in 2010 was 99% of that actual value, suggesting that the net effect of the 2010 oil spill on the hypoxic zone size was negligible. A tropical storm, however, may have reduced the potential size of the hypoxic zone. Lowering the May nitrogen load to about 70,000 mton N nitrate+nitrite would bring the model's predicted hypoxic zone size down to the management goal of 5000 km(2) and restore hypoxic waters to normoxic conditions.  相似文献   

Organotin compounds in seawater and Mytilus galloprovincialis mussels along the Croatian Adriatic Coast     

Furdek M  Vahčič M  Ščančar J  Milačič R  Kniewald G  Mikac N 《Marine pollution bulletin》2012,64(2):189-199

In this work, data on the level of organotin compounds (OTCs) in seawater and mussels collected along the entire Croatian Adriatic Coast are presented. The samples were collected in 2009 and 2010 at 48 locations representing different levels of maritime activities, including marinas, ports and reference sites. Butyltins (BuTs) were found in all analyzed samples, representing >97% of OTCs, and ranged from 0.46 to 27.98 ng Sn L(-1) in seawater and from <6 to 1675 ng Sn g(-1) in mussels. The results indicate a recent input of TBT, with the highest concentrations of BuTs found in the marinas. It appears that the Adriatic coast is still polluted with TBT despite the fact that TBT-containing antifouling paints have been banned in Croatia since 2008. It is questionable how much TBT pollution decreased since 2005, when a high incidence of imposex was established in the same area.  相似文献