Adsorption of Complex Pollutants from Aqueous Solutions by Nanocomposite Materials     

Yeoung‐Sheng Wang  Shu‐Huei Hsieh  Chang‐Hung Lee  Jao‐Jia Horng 《洁净——土壤、空气、水》2013,41(8):828-828

  相似文献   

A hybrid approach of artificial neural network and multiple regression to forecast typhoon rainfall and groundwater-level change     

Ping-Cheng Hsieh  Wei-An Tong 《水文科学杂志》2013,58(14):1793-1802

ABSTRACT

A forecasting model is developed using a hybrid approach of artificial neural network (ANN) and multiple regression analysis (MRA) to predict the total typhoon rainfall and groundwater-level change in the Zhuoshui River basin. We used information from the raingauge stations in eastern Taiwan and open source typhoon data to build the ANN model for forecasting the total rainfall and the groundwater level during a typhoon event; then we revised the predictive values using MRA. As a result, the average accuracy improved up to 80% when the hybrid model of ANN and MRA was applied, even where insufficient data were available for model training. The outcome of this research can be applied to forecasts of total rainfall and groundwater-level change before a typhoon event reaches the Zhuoshui River basin once the typhoon has made landfall on the east coast of Taiwan.  相似文献   

Fishing effects on age and spatial structures undermine population stability of fishes     

Chih-hao Hsieh  Atsushi Yamauchi  Takefumi Nakazawa  Wei-Fen Wang 《Aquatic Sciences - Research Across Boundaries》2010,72(2):165-178

Overfishing has caused dramatic changes in structures of exploited populations as well as ecosystems. In this article, we focus on fishing effects on age (size) and spatial structures of exploited fishes. Accumulating evidence has shown that large and experienced spawning individuals are able to produce higher quality and quantity of eggs, known as maternal effects, and that individuals of different age classes tend to spawn in different locations and times. These behaviors are associated with a healthy age structure and contribute to bet-hedging capacity that is important in smoothing out short-term environmental variability. Here, we document a widespread phenomenon of age (size)-truncation of exploited populations driven by size-selective fishery removals. Such size-selective fishing may have evolutionary consequence and may be difficult to reverse. In addition, fishing often reduces population spatial heterogeneity that also contributes importantly to bet-hedging. We review studies showing that the effects of age truncation and reduction of spatial heterogeneity have reduced resilience and elevated the fluctuation amplitude of exploited populations facing a changing environment. Recent analyses indicated that fish populations often exhibit nonlinear nature and have potential to shift dramatically in a short time. All the evidence suggests that fishing, by altering age or spatial structures, may make exploited fishes, more prone to catastrophic shifts. Therefore, to achieve sustainable fisheries, management should conserve the age and spatial structure in addition to viable spawning biomass.  相似文献   

Comparative analysis of Venus and Mars magnetotails     

A. Fedorov  C. Ferrier  S. Barabash  C. Mazelle  H. Gunell  K. Brinkfeldt  A. Grigoriev  M. Yamauchi  W. Baumjohann  A.J. Coates  D.R. Linder  K.C. Hsieh  J.-J. Thocaven  H. Koskinen  T. Sales  P. Riihela  N. Krupp  J. Luhmann  S. Orsini  A. Mura  M. Maggi  P. Brandt  K. Szego  R.A. Frahm  J.R. Sharber  P. Bochsler 《Planetary and Space Science》2008,56(6):812-817

We have an unique opportunity to compare the magnetospheres of two non-magnetic planets as Mars and Venus with identical instrument sets Aspera-3 and Aspera-4 on board of the Mars Express and Venus Express missions. We have performed both statistical and case studies of properties of the magnetosheath ion flows and the flows of planetary ions behind both planets. We have shown that the general morphology of both magnetotails is generally identical. In both cases the energy of the light (H⁺) and the heavy (O⁺, etc.) ions decreases from the tail periphery (several keV) down to few eV in the tail center. At the same time the wake center of both planets is occupied by plasma sheet coincident with the current sheet of the tail. Both plasma sheets are filled by accelerated (500-1000 eV) heavy planetary ions. We report also the discovery of a new feature never observed before in the tails of non-magnetic planets: the plasma sheet is enveloped by consecutive layers of He⁺ and H⁺ with decreasing energies.  相似文献   

The construction and application of a carrying capacity evaluation model in a national park   总被引：2，自引：1，他引：1  

Han-Shen Chen  Chia-Yon Chen  Chiung-Tze Chang  Tsuifang Hsieh 《Stochastic Environmental Research and Risk Assessment (SERRA)》2014,28(6):1333-1341

This work applies ecological footprint analysis to establish the framework of a carrying capacity model for a national park. The model estimates changes in ecological footprint and biocapacity indicators for Taroko National Park (Taiwan) from 2002 to 2011. The findings indicate that: (1) In the past 10 years, the biocapacity status of Taroko National Park has remained within the environmental capacity; however, the per-capita ecological reserve decreased by 73.38 % between 2002 and 2011, from 0.085010 global hectares to 0.022633 global hectares. Evaluation of the ecological footprint intensity index reveals that the park has maintained a level 1 status, the highest ecological security level; (2) Linear estimation undertaken in the study predicts that when the ecological footprint intensity index reaches 0.5—when the ecological security level falls from level 1 (good) to level 2 (fair)—the critical tourist-carrying capacity would be 3,380,351 visitors per year, or 1.18 times the number of tourists in 2011. Furthermore, when the ecological footprint intensity index reaches 0.8—when the ecological security falls to level 3 (poor)—the critical tourist-carrying capacity would be 5,408,561 visitors per year, or 1.88 times the number of tourists in 2011. This work adopted the ecological footprint method and the threshold ecological footprint intensity index value to estimate the critical number of tourists for the sustainable biocapacity of Taroko National Park. The results are intended to serve as a reference for national park administrators to develop policies on tourist carrying capacity.  相似文献   

Effects of summer mesoscale hydrographic features on epipelagic siphonophore assemblages in the surrounding waters of Taiwan, western North Pacific Ocean     

Wen-Tseng Lo  Shwu-Feng Yu  Hung-Yen Hsieh 《Journal of Oceanography》2013,69(5):495-509

This is the first attempt to examine the relationship between the spatial distribution of siphonophores and mesoscale hydrographic features in the waters around Taiwan in summer. A total of 59 species of siphonophores, consisting of 12 Physonectae and 47 Calycophorae, were identified from our samples. The most abundant species were Lensia subtiloides (49.7 % of the total collection by number), Diphyes chamissonis (12.1 %), Chelophyes appendiculata (9.3 %), C. contorta (8.1 %), and Bassia bassensis (5.2 %). Two clear assemblages were associated with shelf waters (influenced by the South China Sea Surface Current) and oceanic waters (influenced by the Kuroshio Current), respectively. The shelf water assemblage was characterized by low diversity and high abundance of L. subtiloides, whereas the oceanic assemblage showed greater diversity and was dominated by C. appendiculata, C. contorta, and B. bassensis. We discovered strong correlations between temperature and zooplankton and siphonophore abundances, suggesting that temperature and prey concentration are important in determining the spatial distribution of siphonophores. In addition, lower abundance and higher species diversity of siphonophores were observed after the passage of typhoons. This study provides basic knowledge on the distributional patterns of siphonophores, which is essential information to further understand the ecological roles played by siphonophores and their responses to the hydrological conditions in the waters surrounding Taiwan.  相似文献   

Late Holocene coseismic uplift on the Hua-tung coast, eastern Taiwan: Evidence from mass mortality of intertidal organisms     

Meng-Long Hsieh  Ruey-Juin Rau 《Tectonophysics》2009,474(3-4):595-609

The evidence of coseismic uplift on the dynamic, wave-dominated Hua-tung coast fringing the active Coastal Range (eastern Taiwan) has been equivocal, due to complex controls by wave and terrestrial sediment over morphological and ecological systems of the coast. This study, by applying radiocarbon dating methods, demonstrates coseismic-uplift nature of the coast by finding synchronously killed intertidal organisms (mostly boring shell Jouannetia sp.) stranded at different sites of the coast with distinct physiographic characters. Based on these data, together with evidence from wave-cut notch sequences, two coseismic-uplift systems are recognized. One centers around the northern-middle part of the coast and yields events with uplift amounts of maximal 3–6 m and an average recurrence interval of at least several hundred years. The most recent activity of this system, influencing at least 70 km of coast, occurred at ~ 0.9 ka. The earthquake generating this event also triggered extensive landslides/debris flows in the region. Another system, exemplified by the uplift associated with the 2003 Cheng-kung earthquake, centers on the southern part of the coast and yields uplift of likely < 1 m every < 0.2 ky. Two pre-historic events of this system are identified as occurring at ~ 0.7 ka and ~ 1.1 ka. These two coseismic-uplift systems are consistent in position with two anticlinal structures defined by long-term uplift of the coast. However, the areas subjected to maximal coseismic uplift are located off where the climaxes of long-term uplift occur, implying that the latter areas have been uplifted mainly by aseismic and/or relatively frequent/small-magnitude coseismic motion.  相似文献   

Hainan — the island of South Sea a new province in China     

Hsieh Chaio-min Prof. Dr.  Gong-fu Zhong Prof. 《GeoJournal》1990,20(4):385-391

  相似文献   

十六世纪以来广东气候的变化     

谢焕强 《地理研究》1984,3(4):104-110

本文对十六世纪以来广东省气候和未来气候趋势进行了初步探讨。  相似文献   

Pyrite accumulation and sulfate depletion as affected by root distribution in aJuncus (needle rush) salt marsh     

Y. P. Hsieh  C. H. Yang 《Estuaries and Coasts》1997,20(3):640-645

This study was undertaken to investigate patterns of pyrite accumulation found in aJuncus roemerianus tidal marsh of north Florida. We speculate that the pattern of pyrite accumulation was caused mainly by the distribution of roots. Sediment cores from living stands (LS), dead stands (DS), and recently killed stands (RKS) were collected and analyzed for dissolved organic carbon (DOC), sulfate, chloride, Cr(II)-reducible sulfide, and biomass of roots and rhizomes. Living roots were distributed mainly in the upper 16 cm and concentrated 4–10 cm below the sediment surface. Pyrite accumulations were significantly different among the three types of sediment cores in the upper 16 cm sediment and follow the descending order of DS (615 μmol cm^?3)>RKS (547 μmol cm^?3)>LS (368 μmol cm^?3). Between 20 cm and 30 cm, pyrite contents approached values of 40 μmol cm^?3 and 55 μmol cm^?3 in all sediment cores. The degree of pyritization approaches 92–94% between 14 cm and 20 cm where pyrite accumulation was probably limited by available iron. Root distribution also affected the redistribution of iron through iron sulfide formation. Sulfate depletion in the upper 16 cm was higher in RKS (79.3 μmol cm^?3) than DS (49.1 μmol cm^?3). No significant sulfate depletion was found in LS. Sulfate reduction under DS was likely limited by the readily available substrates. Root distribution had a major influence on pyrite accumulation and sulfate reduction of the marsh, and its effects need to be addressed in studies of wetland sulfur dynamics.  相似文献