Ionic‐Liquid‐Assisted Hydrothermal Synthesis of Ag/AgBr for Photodegradation of Imidacloprid under Visible Light     

Dandan Guo  Xiaoqing Zhu  Sheyun Chen  Cenling Wang  Mingli Pi  Xiaoxia Chen  Yuqing Shi  Jingtao Dai 《洁净——土壤、空气、水》2019,47(5)

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ISOTOPIC AND IONIC VARIATIONS IN GLACIER RIVER WATER DURING THREE CONTRASTING ABLATION SEASONS     

WILFRED H. THEAKSTONE  N. TVIS KNUDSEN 《水文研究》1996,10(4):523-539

The significance of the baseflow component of glacier river discharge in summer varies with geographical location, altitude, glacier geometry and glacier size. Baseflow is maintained by meltwater generated above the transient equilibrium line and by water released from temporary storage on, in or beneath the glacier. At the Norwegian glacier Austre Okstindbreen, where precipitation is generally high throughout the year and the summers are cool and wet, observations in three successive, but contrasting, years have shown that Na⁺ ion concentrations in the glacier river water are influenced strongly by the amount of snowmelt. This itself depends on the preceding winter conditions, which determine the amount of accumulation, and on the current summer's weather. The efficiency of the glacier's drainage systems depends on the general progress of summer ablation. The speed with which the systems develop influences ion provision from subglacial sources. Ca²⁺ ion concentrations are largely determined by subglacial conditions. Oxygen isotope variations in glacier river water reflect the relative contributions made to total discharge by snow meltwater and other sources; the composition of the snow cover, which is a function of winter temperatures, has a strong influence. Ice meltwater has low isotopic variability, but the isotopic composition of rainfall varies markedly. A simple model of mixing of englacial and subglacial waters, each of a constant composition, cannot be applied to a high-latitude glacier of the size and altitudinal range of Austre Okstindbreen.  相似文献   

华北平原典型工业城市秋、冬季大气细颗粒物污染特征     

钱若芷  田密  陈阳  赵晴  彭超  石光明  杨复沫 《地球化学》2021,50(1):1-11

济宁市是位于华北平原大气污染传输通道上的工业城市,为研究其秋、冬季细颗粒物(PM2.5)的污染特征,在市区的3个站点进行了PM2.5的同步滤膜采样.采样期为2018年10月15日至2019年1月31日,涵盖非采暖期和采暖期(自2019年11月15日始),共270个小流量滤膜样品.研究结果表明,济宁市秋、冬季PM2.5平...  相似文献   

Effect of tooth spacing and mesh size on the catch of the Portuguese clam and razor clam dredge   总被引：1，自引：1，他引：0  

Gaspar  M. B.; Castro  M.; Monteiro  C. C. 《ICES Journal of Marine Science》1999,56(1):103-110

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Ionic Strength Dependence of Rare Earth – NTA Stability Constants at 25°C     

Biqiong Li  Robert H. Byrne 《Aquatic Geochemistry》1997,3(2):99-115

Observations of competitive complexation of NTA by Cu2+ and rare earth element (REE) ions are used to determine REE-NTA stability constants at ionic strengths between 0.1 and 5.0 molar. Although REE stability constants change markedly with ionic strength, differences in the ionic strength dependence of REE-NTA stability constants across the rare earth element series are small. The ionic strength dependence of log1 for Y and REEs with NTA at 25 °C can be described as: log1(M) = log1(M)0 - 9.198 I1/2/(1+B I1/2)+C I + D I3/2, where 1(M) = [MNTA°][M3+]-1[NTA3-]-1, I is ionic strength, B = 1.732, C = 0.1596, D = 0.0816, and log1(M)° is the metal-NTA stability constant at zero ionic strength.  相似文献   

Selectivity of diamond- and square-mesh codends in the deepwater crustacean trawl fishery off the Balearic Islands (western Mediterranean)   总被引：3，自引：2，他引：3  

Guijarro  Beatriz; Massuti  Enric 《ICES Journal of Marine Science》2006,63(1):52-67

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An analysis of a zooplankton sampling-gear change in the CalCOFI long-term monitoring program, with implications for copepod population abundance trends     

Ginger A. Rebstock   《Progress in Oceanography》2002,53(2-4)

The California Cooperative Oceanic Fisheries Investigations (CalCOFI) program has been systematically sampling zooplankton off the west coast of North America since 1949. In 1978, the 1-m diameter ring net used by the program was replaced with a bongo net, which consists of two 0.71-m diameter nets on a single frame. This study compares paired zooplankton samples taken with a ring net and a 0.71-m or 0.6-m bongo net to determine the relative performances of the two net types for catching calanoid copepods. Thirty-one species and stages were enumerated, along with the category ‘total female calanoids’. Twenty-one categories of calanoid copepods were abundant enough to test for effects of changes in net type. No significant differences between the nets were found after correcting for multiple testing. Statistical power was then estimated for a range of potential net effects equivalent to ratios of copepod densities between the nets of 1.1–3.0. The probability of detecting differences greater than a factor of 1.5–3.0 was high (≥80%) for total female calanoids, Metridia pacifica, Pleuromamma abdominalis edentata, P. borealis, Calanus pacificus, Eucalanus californicus and Rhincalanus nasutus. For these categories of copepods, any population changes greater than a factor of 1.5–3.0 that might be found from the CalCOFI data set can be assumed to be the result of factors other than the change in net type.  相似文献   

Size selectivity of diamond and square mesh codends for four commercial Mediterranean fish species   总被引：2，自引：2，他引：2  

Petrakis  George; Stergiou  Konstantinos I. 《ICES Journal of Marine Science》1997,54(1):13-23

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Relative selectivity in trawl, longline and gillnet fisheries for cod and haddock   总被引：1，自引：0，他引：1  

Huse  Irene; Lokkeborg  Svein; Soldal  Aud Vold 《ICES Journal of Marine Science》2000,57(4):1271-1282

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Fishing practice, gear design, and the ecosystem approach three case studies demonstrating the effect of management strategy on gear selectivity and discards     

Graham  Norman; Ferro  Richard S. T.; Karp  William A.; MacMullen  Philip 《ICES Journal of Marine Science》2007,64(4):744-750

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