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991.
Guangshan Liu Sumei Liu Jing Zhang Yipu Huang Min Chen 《Water, Air, & Soil Pollution: Focus》2007,7(6):693-701
Sediment cores were collected from two sites (A2 and ZQ) in the Qingdao sea area of the Yellow Sea. Radionuclides 40K, 137Cs, 210Pb, 226Ra, 228Ra, 228Th, 234Th, and 238U in the cores were measured using HPGe γ spectrometry. The sedimentation rate of the A2 Core using 210Pbex and 137Cs was 0.665 cm yr−1, therefore this 32 cm long core represents a 48 year timespan leading to the sampling date in 2001. The mixing layer was
restricted to the upper 5 cm as determined from the profile of 234Th. The uniformity of the activity distributions of 40K and 238U throughout the A2 Core and the activity distributions of 226Ra, 228Ra and 228Th below the mixing layer suggested that no significant oceanographic event or change in sediment material source had occurred
during this timespan. The 210 Pb was in excess relative to 226Ra, but 226Ra was deficient with respect to 238U in the entire A2 Core, while excess 234Th and 228Th were apparent only in the surface 5 cm. Total organic matter (TOM) in Core A2 decreases with depth. The second core, taken
to a depth of 14 cm, was from Site ZQ, which is located near Zhanqiao, Qingdao. The variations of the nuclide activity ratios
in this core were similar to those in the A2 Core, i.e., the excess 210 Pb and 226Ra deficiency were consistent throughout the core but excess 228Th was only in the surface to a depth of 2 cm. The 40K activity in the ZQ Core fluctuated and showed no real trend with depth. The activities of 137Cs, 210Pb, 226Ra and 238U in the entire length of Core ZQ, and 228Ra and 228Th from 2 cm to the bottom, were comparable within the uncertainty of measured activity. 相似文献
992.
J. Bai K. R. Li D. Y. Liu J. Zhang H. F. Zhang G. S. Liu J. L. Li Z. Y. Li D. M. Gao 《Water, Air, & Soil Pollution: Focus》2007,7(6):673-681
The distribution patterns and factors affecting uptake rates and turnover times of dissolved inorganic nutrients by heterotrophic
bacterioplankton (HB) in Jiaozhou Bay were studied based on in situ surveys and laboratory culturing. The uptake rates of
dissolved inorganic phosphorus (DIP) and dissolved inorganic nitrogen (DIN) by HB are limited by the temperature of the water
and the concentration of dissolved organic carbon. The turnover times of DIP and DIN by HB are regulated by the concentrations
of the nutrients and the numbers of HB, which show significant spatiotemporal variability in Jiaozhou Bay. HB may aggravate
the P-limitation of phytoplankton by competing for phosphorus in summer in Jiaozhou Bay. HB play an important role in the
biogeochemical cycling of nutrients and may increase the N:P ratio and the accumulation of DIN, thereby accelerating the imbalance
of the N:P ratio in Jiaozhou Bay. 相似文献
993.
煤气管道的震害率分析 总被引:2,自引:0,他引:2
埋地管道的地震危险性分析方法可以分为理论分析法和经验统计法。震害率是经验统计法中常用的一个概念。埋地管道在地震中破坏的主要原因是地面运动和场地土液化等引起的场地土失效,另外管线的接口类型、管材、管径等也是决定其震害的因素。在查阅相关文献的基础上,对埋地管道的震害率分析方法进行了综述,并运用经验统计法提出了便于使用的煤气管道震害率估算表达式。 相似文献
994.
二次过街路口行人违反交通法规规律的研究 总被引:1,自引:0,他引:1
为了解在不同类型二次过街路口行人违反交通法规闯红灯的违法率,找出二次过街路口不同参数对行人违法率的影响,从而找出降低路口行人违法率的对策,保障路口行人交通安全和人车流畅通,本文选取上海市5种类型的二次过街路口调查行人在路口的违法率.通过分析调查数据,行人在路口一次穿越车道数为2~7,两次穿越车道总数为6~12,违法率随车道数的增加而降低.在红灯等待时间90 s之内,行人违法率随等待时间的升高呈一定的下降趋势.红灯等待时间在90~150 s之间,行人违法率没有确定的规律.安全岛、引导护栏、中继信号灯等设施具有明显降低行人违法率的作用.根据二次过街路口设置安全岛、引导护栏、中继信号灯、车道数以及是否从路边穿越5个影响因素的安全评价系数之和建立综合安全评价系数,得到行人在二次过街路口违法率随综合安全评价系数的增大而降低.研究表明,完善和优化二次过街路口的设施参数可以降低路口行人违法率. 相似文献
995.
Geeta Mehta Amar K. Mohanty Lawrence T. Drzal Donatien Pascal Kamdem Manjusri Misra 《Journal of Polymers and the Environment》2006,14(4):359-368
The durability of biocomposites utilized for building components has been a subject of recent concern and questioning. To address these concerns, the long-term effects of weathering on biocomposites used as building components were evaluated using an accelerated weatherometer. The biocomposite samples were processed by sheet molding compounding (SMC) panel processing and/or compression molding. The accelerated weatherometer served to expose the samples to ultraviolet radiation (UV), condensation, and water spray at levels pertinent to actual conditions: 48 cycles of UV (340 nm) treatment at 60 °C for 2.5 h was followed by water spray for 0.5 h, and then condensation at 45 °C for 24 h. Twelve cycles were repeated in each test, and the total duration for the complete test was 2016 h. Measurements for color, surface roughness test weight change, and dynamical mechanical analysis were taken at regular intervals of time. It was found that the surface roughness increased, as the color changed, and storage modulus decreased with increases in the exposure time of the samples to accelerated weathering conditions, compared to their properties at the beginning of the test. 相似文献
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999.
J.??áslavskyEmail author P.?Kotla?íková K.?Bene?ová 《Environmental Chemistry Letters》2004,2(2):89-92
Semipermeable membrane devices (SPMDs) are nowadays used as passive samplers of organic pollutants. The knowledge of the sampling rate values (RS) of each substance trapped on membranes is necessary to calculate their average concentration. Here we calculate RS values for 16 polycyclic aromatic hydrocarbons using the comparison of active sampling method results and the amounts sequestered by SPMDs at varying exposure times.Selected article from the Regional Symposium on Chemistry and Environment, Krusevac, Serbia, June 2003, organized by Dr. Branimir Jovancicevic. 相似文献
1000.
不同自然暴露方法对聚丙烯老化的影响 总被引:5,自引:1,他引:4
采用直接大气暴露、玻璃板下暴露和百页窗下暴露3种自然暴露方法,研究了聚丙烯塑料外观、力学性能和熔融指数在海南自然暴露过程中的变化,考察了光、热、氧对聚丙烯老化的影响。结果表明:自然环境下,光和热均是引起聚丙烯老化降解的主要因素.并且光的作用更强.氧对聚丙烯老化的影响很小:冲击强度对聚丙烯的老化相当敏感.海南自然暴露9个月时.直接大气暴露的聚丙烯试样冲击强度保持率下降至原始的10%左右。 相似文献