A Study on the Pollution and Water Quality Modeling of the River Buyuk Menderes,Turkey   总被引：1，自引：0，他引：1  

Cengiz Koç 《洁净——土壤、空气、水》2010,38(12):1169-1176

  相似文献   

滇池微囊藻水华多糖的提取和化学特征   总被引：1，自引：0，他引：1  

耿兰芳  李朋富  宋立荣  孔繁翔  于洋  王玉炯  刘志礼 《湖泊科学》2007,19(6):637-642

为了研究"水华"微囊藻多糖及其对水体化学和生态特性的影响,以去离子水、pH5的缓冲液和pH9.2的缓冲液为提取液,分别在4℃和80℃条件下从滇池"水华"微囊藻中提取多糖,并对其所提多糖部分化学特征进行分析.结果表明pH9.2的缓冲液所提多糖总得率最高,为2.25%;pH5的磷酸盐缓冲液所提多糖总得率最低,为0.383%.溶解性分析表明,不同提取液所提多糖在所试验的几种溶剂中表现为不溶、分散或部分溶解,未能找到将多糖完全溶解的溶剂.气相色谱和气-质联用分析表明,不同提取液所提多糖都含有中性单糖鼠李糖、阿拉伯糖、甘露糖、葡萄糖、半乳糖和一个未知糖.硫酸-咔唑法分析显示不同提取液所提多糖含有糖醛酸.电感耦合等离子光谱显示去离子水4℃条件下所提多糖含有很高的金属元素钙和镁,分别为2.15%和0.4%.初步研究显示,"水华"微囊藻多糖为酸性杂多糖,低溶解性显示在自然水体中它易形成多糖颗粒,有较高含量的金属元素说明它会影响到这些金属元素在滇池中的溶解、沉积、生物利用和循环,特别是钙和镁.  相似文献   

Centrifuge modeling of disconnected piled raft using vertical pushover tests     

Park  Heon-Joon  Ko  Kil-Wan  Song  Young-Hun  Song  Myung-Jun  Jin  Seokwoo  Ha  Jeong-Gon  Kim  Dong-Soo 《Acta Geotechnica》2020,15(9):2637-2648

Acta Geotechnica - A disconnected piled raft (DPR) foundation has been introduced as an effective pile design to reduce the vertical loading experienced by the pile. The characterization of DPRs...  相似文献   

Implementation of porous material through eco-tech for deep cement–soil mixing     

You-Seong Kim  Se-Gwan Seo  Hyoung-Woo Ko 《Marine Georesources & Geotechnology》2018,36(8):931-939

  相似文献   

Temporal dynamics,meteorological effects,secondary organic aerosol estimation,and source identification of size-segregated carbonaceous aerosols     

Burçak Tarhan  Ebru Koçak 《洁净——土壤、空气、水》2024,52(4):2300095

During the period 2019–2020, size-segregated aerosol samples containing elemental and organic carbon (EC and OC) were investigated. These samples were collected weekly using an eight-stage cascade impactor from an urban site located at Aksaray University, Aksaray. The quantification of EC and OC was carried out through a thermal-optical transmission device. The results revealed consistent size distribution attributes of EC and OC between winter and summer. Although EC accounted for an insignificant percentage (4.4%) of particulate matter (PM) in the PM_9.0–10.0 fraction during winter, a more substantial portion of OC in the same fraction (13.4%) comprised EC. Seasonal variations were distinct for EC but not significant for OC. Strong correlations between OC and EC were observed in coarse particle fractions, indicating a common source, with weaker correlations in fine particles. The highest OC/EC ratio was in the PM_0.43–0.65 fraction, followed by PM_2.1–3.3. The ratio of OC to EC in fine PM exceeded the threshold of 15 consistently. The observation indicates that as particle size increases, there is a noticeable decline in the OC to EC ratios. Secondary organic aerosols (SOA) accounted for 60.8% (winter) and 89.8% (summer) of OC values, emphasizing the substantial impact of SOA on Aksaray's atmosphere. Both seasons exhibited a multimodal distribution of ambient OC. In winter, the EC distribution was dominated by fine particles, with a bimodal pattern (PM_1.1–2.1 and PM_0.43–0.65 peaks). Common pollutant sources, including traffic emissions, road dust, biogenic emissions, and coal combustion, were identified for both seasons in coarse and fine particle fractions. These findings underscore the importance of emission control strategies targeting fine PM in Aksaray.  相似文献   

A fifty-year production and economic assessment of common property-based management of marine living common resources: A case study for the women divers communities in Jeju,South Korea     

Jae-Young Ko  Glenn A. Jones  Moon-Soo Heo  Young-Su Kang  Sang-Hyuck Kang 《Marine Policy》2010

We examined the conditions of successful common property-based management for coastal marine living resources, using a case of historically and anthropologically well established women divers communities on Jeju Island, South Korea, focusing on their decentralized work rules and production records. Due to their tight social network and work rule, the women divers have harvested coastal marine living resources with limited fishing pressure exclusively from their village fishing grounds for over 400 years. However, their harvest patterns have been mostly reactive to market prices, eventually requiring direct governmental regulations such as total allowable catch in some cases. Most recently, the communities have been experiencing multiple challenges: their aging population, water pollution in the coastal zone, competition with cultured products and imported seafood, and expanding barren grounds. These challenges demand a multi-scale/dimensional response if the women divers communities are to keep their village fishing grounds and communities sustainable.  相似文献   

Assessment of Tidal Stream Energy Resources Using a Numerical Model in Southwestern Sea of Korea     

Park  Jun-Seok  Lee  Chol-Young  Park  Jin-Soon  Choi  Hyun-Woo  Ko  Dong-Hui  Lee  Jung-Lyul 《Ocean Science Journal》2019,54(4):529-541

Ocean Science Journal - In this study, tidal stream energy resources of the Southwestern Sea of Korea were assessed using a numerical model, Modelo Hidrodinâmico (MOHID). This numerical model...  相似文献   

European glacial relict snails and plants: environmental context of their modern refugial occurrence in southern Siberia          下载免费PDF全文

Michal Horsák  Milan Chytrý  Petra Hájková  Michal Hájek  Jiří Danihelka  Veronika Horsáková  Nikolai Ermakov  Dmitry A. German  Martin Kočí  Pavel Lustyk  Jeffrey C. Nekola  Zdenka Preislerová  Milan Valachovič 《Boreas: An International Journal of Quaternary Research》2015,44(4):638-657

Knowledge of present‐day communities and ecosystems resembling those reconstructed from the fossil record can help improve our understanding of historical distribution patterns and species composition of past communities. Here, we use a unique data set of 570 plots explored for vascular plant and 315 for land‐snail assemblages located along a 650‐km‐long transect running across a steep climatic gradient in the Russian Altai Mountains and their foothills in southern Siberia. We analysed climatic and habitat requirements of modern populations for eight land‐snail and 16 vascular plant species that are considered characteristic of the full‐glacial environment of central Europe based on (i) fossil evidence from loess deposits (snails) or (ii) refugial patterns of their modern distributions (plants). The analysis yielded consistent predictions of the full‐glacial central European climate derived from both snail and plant populations. We found that the distribution of these 24 species was limited to the areas with mean annual temperature varying from ?6.7 to 3.4 °C (median ?2.5 °C) and with total annual precipitation varying from 137 to 593 mm (median 283 mm). In both groups there were species limited to areas with colder and drier macroclimates (e.g. snails Columella columella and Pupilla loessica, and plants Kobresia myosuroides and Krascheninnikovia ceratoides), whereas other species preferred areas with relatively warmer and/or moister macroclimates (e.g. snails Pupilla turcmenica and P. alpicola, and plants Artemisia laciniata and Carex capillaris). Analysis of climatic conditions also indicated that distributional shifts of the studied species during the Pleistocene/Holocene transition were closely related to their climatic tolerances. Our results suggest that the habitat requirements of southern Siberian populations can provide realistic insights into the reconstruction of Eurasian, especially central European, glacial environments. Data obtained from modern populations also highlight the importance of wet habitats as refugia in the generally dry full‐glacial landscape.  相似文献   

Hydrothermal activity during tectonic building of the Variscan orogen recorded by U-Pb systematics of xenotime in the Grès Armoricain formation,Massif Armoricain,France     

Romain Tartèse  Marc Poujol  Eric Gloaguen  Philippe Boulvais  Kerstin Drost  Jan Košler  Theodoros Ntaflos 《Mineralogy and Petrology》2015,109(4):485-500

  相似文献   

Signatures of tidal interference patterns in the South China Sea     

Alex Warn-Varnas  Dong S. Ko  Avijit Gangopadhyay 《Journal of Oceanography》2015,71(3):251-262

  相似文献