Removal of Nitroaniline From Water/Ethanol by Electrocoagulation Using Response Surface Methodology          下载免费PDF全文

Guy Bertrand Tamne  Charles Peguy Nanseu‐Njiki  Ede Bodoki  Robert Săndulescu  Radu Oprean  Emmanuel Ngameni 《洁净——土壤、空气、水》2016,44(4):430-437

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Influence of Temperature on the Removal of Extremely High Concentration p‐Nitrophenol Simulated Wastewater by Fe/Cu/H2O Systems          下载免费PDF全文

Bo Lai  Dong‐Hai Yuan  Zhao‐Yu Chen  Yue Yuan  Ping Yang 《洁净——土壤、空气、水》2016,44(4):345-355

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Experimental Investigation on Abstraction of Phenol Onto Micrococcus lylae and Cetyl Trimethyl Ammonium Bromide          下载免费PDF全文

Natarajan Saravani  Muthukumarasamy Arulmozhi  Kugarajah Vaidhegi 《洁净——土壤、空气、水》2016,44(11):1489-1498

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Influence of Nonionic Surfactants on Fungal and Bacterial Degradation of Hexane          下载免费PDF全文

Christopher M. Hessler  George Sorial  Youngwoo Seo 《洁净——土壤、空气、水》2016,44(7):745-752

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茂名油页岩沉积有机质特征及古气候意义     

曹新星  宋之光  李艳  王丽 《地学前缘》2016,23(3):243-252

基于海洋沉积确定的始新世晚期至渐新世早期(约33.5 Ma)的气候过渡期是新生代全球性气候事件,但长期以来相关的陆相沉积记录研究则比较缺乏。本文对形成于始新世晚期至渐新世早期的茂名油柑窝组油页岩样品进行了有机质丰度、烃类组成、单体烃碳同位素组成等分析,以期研究低纬度陆相沉积有机质对古近纪始新世-渐新世气候过渡期(EOT)的响应。研究结果显示,埋藏较浅的上部层位样品正构烷烃碳同位素组成显著正偏,为-19.1‰~-25.9‰,平均值为-22.2‰;而下部层位样品正构烷烃碳同位素组成在-23.7‰~-30.2‰,平均值为-26.3‰。两个样品正构烷烃碳同位素组成之差在1.5‰~8.1‰,平均值之差为4.6‰。正构烷烃碳同位素组成的显著差异指示了EOT低纬度陆相古气候变化引起的陆相有机质响应,而这种响应与当时大气CO2浓度和海洋温度降低导致的气候和植物群落变化密切相关,即可能存在着C3植物向C4植物的转化、C4植物的迅速增加并最终导致沉积有机质碳同位素组成的变化;也可能是由于大气CO2浓度降低导致的大气CO2碳同位素组成整体正偏的结果。很显然,进一步详细的连续剖面分析将对研究古近纪EOT低纬度陆相古气候变化提供重要科学依据。  相似文献   

铵盐镍基电镀金刚石钻头的电化学机理研究及应用          下载免费PDF全文

阎冠欣  王群英 《探矿工程》2009,36(3):72-75

以微机控制电化学分析系统对铵盐镍基胎体镀层的电化学机理进行研究,试验了硫酸镍用量、氯化铵用量、镀液温度和镀液的pH值对镍沉积的影响,结果表明保持镀液适当高的pH值、略低的温度和加入氯化铵,可使镍沉积的极化增大,从而使镀层晶粒变小,结晶致密,且氯化铵的加入没有改变阴极过程的控制步骤。在N iSO4.6H2O 280 g/L,NH4Cl 19 g/L,H3BO335 g/L,十二烷基硫酸钠0.1 g/L;镀液温度45℃±1℃,pH值5.2,电流密度3.6 A/dm^2条件下电镀Φ41/27 mm室内钻头,钻进可钻性Ⅷ级的绢云母化含石英斜长石玢岩,钻进时效平均达到1.94 m/h,钻头的磨损约为0.092 mm/m,与普通镍-钴胎体钻头的使用寿命相差不大;但其钻进时效要比镍-钴胎体钻头高0.18 m/h,即约高10%,为野外生产试验提供了试制钻头的可靠资料和经验。  相似文献   

The Geography of Mutual Fund Assets     

《The Professional geographer》2013,65(2):243-255

Mutual funds are the primary investment vehicle for individual retirement savings, but the spatial aspects of mutual fund investments have not been examined. This paper discusses the characteristics of the mutual fund industry and compares them to other financial industries. Previous studies of the financial industry and quaternary location theory are used to formulate three hypotheses predicting the distribution of mutual fund assets: (1) mutual fund assets will concentrate in the largest urban centers; (2) mutual fund assets will become increasingly concentrated in financial centers over the 1986-1996 period; and (3) the distribution of mutual fund assets will be similar to the distribution of other financial activities. Examination of mutual fund asset data from 1986 and 1996 did not fully support any of the three hypotheses. These findings suggest that the standard elements of quaternary location theory may need to be reevaluated.  相似文献   

武威-天祝-庄浪河NNW向断裂分段及变形特征     

候康明  袁道阳  李绍业 《大地测量与地球动力学》1999,19(3):14

在野外专题考察、大比例尺活断层地质填图、高精度地质剖面及阶地剖面实测的基础上,较系统地讨论了武威－ 天祝－ 庄浪河ＮＮＷ 向断裂的活动时代、变形方式及分段特征。结果表明： 该断裂带是一条典型的全新世活动断裂,整个断裂可分为不同几何结构、不同构造类型、不同变形特征的南、中、北三个断层段。其中北段和中段为隐伏断层,发育有第四纪活动褶皱和１９２７ 年古浪８ 级地震破裂带;南段断裂呈弧形几何形态展布,显示了逆断层构造面的基本特征  相似文献   

Chlorinated compounds and polybrominated diphenyl ethers (PBDEs) in mussels (Mytilus galloprovincialis) collected from Apulia Region coasts     

Santina Giandomenico  Lucia Spada  Cristina Annicchiarico  Giorgio Assennato  Nicola Cardellicchio  Nicola Ungaro  Antonella Di Leo 《Marine pollution bulletin》2013

This project was carried out to assess the levels and spatial distribution of organochlorine compounds in the coastal marine environment, using mussels as bioindicators to evaluate the coastal water quality. Levels of polychlorobiphenils (PCB), chlorinated pesticides (DDT isomers, HCH isomers, Aldrin, Dieldrin, alfa-Endosulfan, Hexachlorobenzene, Pentachlorobenzene) and polybrominated diphenyl ethers (PBDEs) were determined in tissues from mussels (Mytilus galloprovincialis) collected along the Apulia Region coasts (Mediterranean Sea). Results indicate that contamination by organochlorine compounds is higher in mussels sampled in the Ionian Sea than in those from the Adriatic Sea, with PCB levels up to seven times higher in mussels from Ionian than from the Adriatic Sea. Although PCB levels were above the maximum values indicated by both European Community (EC) and National regulation in several sample sites, the PCB concentrations were particularly high in some stations, suggesting that these locations require a much specific attention. Conversely, results on the mussel contamination by PBDEs highlight their ubiquitous environmental distribution, and underline the need to establish the maximum level for these compounds in foodstuff, according to European Regulations.  相似文献   

The impact of agricultural land use on stream chemistry and inputs to an inland reservoir: case of the Sauce Grande River,Argentina     

《水文科学杂志》2013,58(4):834-843

Abstract

Water quality in the Paso Piedras Reservoir has deteriorated, primarily due to periodic blue-green algal blooms, making it temporarily unfit for human consumption. This phenomenon results from the eutrophication of waters of the watershed, and nutrients are considered to be the primary contributors to degradation of freshwater quality. In order to reduce the levels of nitrogen and, most of all, phosphorus, entering the Paso Piedras Reservoir, it is necessary to understand the incidence of diffuse transfers of nutrients from agricultural soils. The nitrogen composition, soluble reactive phosphorus (SRP) and other physico-chemical parameters of the water were analysed in various different parts of the watershed in order to characterize water input to the reservoir from areas with different anthropogenic activity. The upper Sauce Grande basin was divided into three areas with different edaphic characteristics. The physico-chemical parameters measured in sampling surveys included: SRP, ammonium and nitrate, pH, conductivity, turbidity, and total solids. The results showed that the water of the Sauce Grande (areas 1 and 2) was not strongly contaminated, but in El Divisorio (Area 3, which is a sub-watershed whose stream flows directly into the Paso Piedras Reservoir), the levels of conductivity, total suspended sediments and SRP were so high that its contribution to the reservoir accounts for nearly 50% of the total SRP input. The main characteristics of El Divisorio watershed that make it a diffuse source of SRP were not only that its soils, under agricultural-livestock production, have significant slopes, so that water and wind erosion are faster, but also that human intervention had caused the destruction of aggregates. The results showed the influence of the soil characteristics, production systems and the micro-environment developed in the reservoir on the characteristics of waters flowing out of the reservoir. The two villages located in Area 2 had no significant influence on the concentration of nitrogen compounds and SRP found downstream.  相似文献