Responses of Ruderal Verbascum olympicum Boiss. (Scrophulariaceae) Growing under Cadmium Stress          下载免费PDF全文

Hülya Arslan  Gürcan Güleryüz  Ayşegül Akpınar  Serap Kırmızı  Ümran Seven Erdemir  Şeref Güçer 《洁净——土壤、空气、水》2014,42(6):824-835

  相似文献   

Profiling Olive Oil Mill Wastewater by Resin Fractionation: Effect of Acid Cracking,Coagulation, Electrocoagulation,and Fenton's Reagent          下载免费PDF全文

Betul Hande Gursoy‐Haksevenler  Idil Arslan‐Alaton 《洁净——土壤、空气、水》2014,42(10):1384-1392

  相似文献   

Post-stack high-resolution deconvolution using Cauchy norm regularization with FX filter weighting     

Hakan Karslı  Recep Güney  Mustafa Senkaya 《Arabian Journal of Geosciences》2017,10(24):551

High-resolution deconvolution can mathematically be viewed as a regularized inverse problem. Besides, the result of the high-resolution deconvolution is generally accepted as reflectivity series of the layered media. On the other hand, lateral continuity is frequently poorer than vertical resolution on post-stack seismic section after application of any high-resolution deconvolution. However, because of the ill-posed inherent of the deconvolution problem, the Cauchy norm regularization term, a non-quadratic prior-information is widely used to provide the stability and uniqueness of the problem. But, it does not provide adequate quality of deconvolution if the noise in the data is strong. In this study, a stable and high-resolution deconvolution of post-stack seismic data was accomplished by an iterative inversion algorithm incorporating the Cauchy norm regularization with FX filter weighting. Cauchy norm regularization was utilized to force the solution to a spikiness structure, while the effective random noise reduction was performed by using the FX filter. Applications to synthetic and real post-stack data showed that the resolution in the vertical direction and continuity in the lateral direction are better improved. Thus, we think that this process makes seismic sections obtained especially from thin layered sedimentary basins more interpretable.  相似文献   

Multi-disciplinary earthquake researches in Western Turkey: Hints to select sites to study geochemical transients associated to seismicity     

Sedat İnan  Kadriye Ertekin  Cemil Seyis  Şakir Şimşek  Furkan Kulak  Aynur Dikbaş  Onur Tan  Semih Ergintav  Rahşan Çakmak  Ahmet Yörük  Muhiddin Çergel  Hakan Yakan  Hüseyin Karakuş  Ruhi Saatçilar  Zafer Akçiğ  Yıldız İravul  Bekir Tüzel 《Acta Geophysica》2010,58(5):767-813

Warm and hot spring water as well as soil gas radon release patterns have been monitored in the Aegean Extensional Province of Western Turkey, alongside regional seismic events, providing a multi-disciplinary approach. In the study period of 20 months, seven moderate earthquakes with M _L between 4.0 and 4.7 occurred in this seismically very active region; two earthquakes with magnitude 5.0 also occurred near the study area. Seismic monitoring showed no foreshock activity. By contrast, hydro-geochemical anomalies were found prior to these seismic events, each lasting for weeks. The anomalies occurred foremost in conjunction with dip-slip events and seem to support the dilatancy and water diffusion hypothesis. Increased soil gas radon release was recorded before earthquakes associated with strike-slip faults, but no soil radon anomalies were seen before earthquakes associated with dip-slip faults. Geochemical anomalies were also noticeably absent at some springs throughout the postulated deformation zones of impending earthquakes. The reason for this discrepancy might be due to stress/strain anisotropies.  相似文献   

Robust representation of dry cells in single-layer MODFLOW models   总被引：1，自引：0，他引：1  

Painter S  Başağaoğlu H  Liu A 《Ground water》2008,46(6):873-881

Dewatered or "dry" grid cells in the USGS ground water modeling software MODFLOW may cause nonphysical artifacts, trigger convergence failures, or interfere with parameter estimation. These difficulties can be avoided in two dimensions by modifying the spatial differencing scheme and the iterative procedure used to resolve nonlinearities. Specifically, the spatial differencing scheme is modified to use the water level on the upstream side of a pair of adjacent cells to calculate the saturated thickness and hence intercell conductance for the pair. This makes it possible to explicitly constrain the water level in a cell to be at or above the cell bottom elevation without introducing nonphysical artifacts. Thus constrained, all initially active cells will remain active throughout the simulation. It was necessary to replace MODFLOW's Picard iteration method with the Newton-Raphson method to achieve convergence in demanding applications involving many dry cells. Tests using a MODFLOW variant based on the new method produced results nearly identical to conventional MODFLOW in situations where conventional MODFLOW converges. The new method is extremely robust and converged in scenarios where conventional MODFLOW failed to converge, such as when almost all cells dewatered. An example application to the Edwards Aquifer in south-central Texas further demonstrates the utility of the new method.  相似文献   

Acoustic harassment devices reduce seal interaction in the Baltic salmon-trap, net fishery   总被引：1，自引：0，他引：1  

Fjalling  Arne; Wahlberg  Magnus; Westerberg  Hakan 《ICES Journal of Marine Science》2006,63(9):1751-1758

  相似文献   

Experimental investigation of pressure distribution on a cylinder due to the wave diffraction in a finite water depth     

Hakan Akyildiz 《Ocean Engineering》2002,29(9):1119-1132

The experimental investigations on the pressure distribution around a large vertical cylinder fixed on a wave channel, piercing the free surface and subjected to regular waves have been carried out. Recently, considerable advances have been made in the development of analytical techniques for studying non-linear wave loading phenomena on large structures. However, there is a lack of high quality experimental data that may be used for validating the analytical and numerical solutions obtained. This paper describes the design and execution of an experiment conducted at the Hydraulics Laboratory in the Civil Engineering Department of the Istanbul Technical University. Experimental measurements of pressures at different locations are presented including comparisons with the computational results. This study showed that the experimental and computational results generally exhibited better correlation, however, the measured pressure values diverged from the computational results while approaching the free surface.  相似文献   

The impact of temporal ionospheric gradients in Northern Europe on relative GPS positioning     

N. Arslan  H. Demirel 《Journal of Atmospheric and Solar》2008,70(11-12):1382-1400

The effect of temporal ionospheric gradients on measured baselines was studied at mid and high latitudes. The experimental analysis was carried out from 14 to 17 July 2000 (day of year (DOY) from 196 to 199), which includes both quiet and stormy days for comparison purposes. Temporal ionospheric gradients caused by the geomagnetic storm affect the ambiguity resolution, resulting in unresolved ambiguities up to 61% for the time periods 21:00–24:00 UT on DOY 197 and 00:00–03:00 UT on DOY 198 for the Kiru-Soda and Kiru-Tro1 baselines (high-latitude, K_p>7). RMS of epoch by epoch coordinate residual change gradually increases from 1.45, 0.96 and 3.67 cm at 9:00–12:00 UT on DOY 197 to 1.79, 1.22 and 4.61 cm at 0:00–03:00 UT on DOY 198 (K_p>8) for the same baselines’ north, east and up coordinate components, respectively. There are no remarkable effects for the selected baselines in the mid-latitude region in both ambiguities and coordinate components.  相似文献   

Reply to the comment on “Prediction of ground vibrations resulting from the blasting operations in an open pit mine by adaptive neuro-fuzzy inference system” by Tarkan Erdik     

Iphar  Melih  Yavuz  Mahmut  Ak  Hakan 《Environmental Earth Sciences》2009,59(2):473-476

Environmental Earth Sciences -  相似文献   

Statistical approaches to evaluate the aquatic ecosystem qualities of a significant mining area: Emet stream basin (Turkey)     

Cem Tokatli  Arzu Çiçek  Özgür Emiroğlu  Naime Arslan  Esengül Köse  Hayri Dayioğlu 《Environmental Earth Sciences》2014,71(5):2185-2197

Emet Stream is one of the most important branches of Uluabat Lake (Ramsar area) and also one of Turkey’s most important river systems. In addition to the geologic structure of the basin, Harmancik Chromium Mines are one of the most important inorganic pollution sources for the basin and also for Uluabat Lake. In the present study, water, sediment and fish (Squalius cii, Capoeta tinca and Barbus oligolepis) samples were collected seasonally from eight stations (one of them was on the Kinik Stream where the Harmancik Chromium Mines is located on and one of them was on the Dursunbey Stream) on the Emet Stream Basin. Some limnological parameters (pH, conductivity and total hardness) in water and Cr, Ca, Mg, Ni and Mn levels in biotic (muscle, gill, liver and kidney tissues of fishes) and abiotic (water and sediment) components of basin were determined to evaluate the effects of Harmancik Chromium Mines on the system. Cluster Analysis, Factor Analysis, Pearson Correlation Index, One Way Anova Tests, Scatter dot Comparing and Matrix plot Distribution Diagrams were applied to the results in order to estimate the data properly. Water samples were evaluated according to the water quality criteria for Turkey and sediment samples were evaluated according to the sediment quality criteria. According to data obtained, statistically significance differences were identified between Kinik and Emet Streams according to Cr and Ni accumulations in water and sediment. Chromium levels of Kinik Stream were extremely higher an average of 153 times for water and 10 times for sediment than uncontaminated stations. Water and sediment quality of Emet Stream were decreasing after falling the Kinik Stream and increasing after falling the Dursunbey Stream. It was also determined that, the amount of chromium in muscle tissues of three fish species were much higher than the limit value of 0.15 mg kg^?1 that FAO identified.  相似文献