Degradation of Reactive Dyes Using Advanced Oxidation Method          下载免费PDF全文

Özgen Ercan  Sabahattin Deniz  Ece Kök Yetimoğlu  Adnan Aydın 《洁净——土壤、空气、水》2015,43(7):1031-1036

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Comments on ‘Ground‐roll attenuation using a 2D time‐derivative filter’ by Paulo E.M. Melo,Milton J. Porsani and Michelângelo G. Silva,Geophysical Prospecting 57, 2009, 343–353     

Hüseyin Özdemir 《Geophysical Prospecting》2010,58(3):535-535

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On the response of a turbulent coastal buoyant current to wind events: the case of the Western Adriatic Current     

Marcello G. Magaldi  Tamay M. Özgökmen  Annalisa Griffa  Michel Rixen 《Ocean Dynamics》2010,60(1):93-122

This numerical study focuses on the response of the Western Adriatic Current to wind forcing. The turbulent buoyant surface current is induced by the Po river outflow in the Adriatic Sea. Idealized and realistic wind conditions are considered by retaining the complex geomorphology of the middle Adriatic basin. In the absence of wind, the Adriatic Promontories force the current to separate from the coast and induce instabilities. Persistent 7-m s^− 1 downwelling favorable northwesterly winds thicken and narrow the current. Instabilities whose size is ~10 km develop but ultimately vanish, since there is not enough across-shore space to grow. On the contrary, 7-m s^− 1 upwelling favorable southeasterly winds thin and widen the current, and instabilities can grow to form mesoscale (~35 km) features. When realistic winds are considered, the same trends are observed, but the state of the sea set up by previous wind events also plays a crucial role. The turbulent regimes set up by different winds affect mixing and the WAC meridional transport. With downwelling winds, the transport is generally southward and mixing happens mostly between the fresher (S ≤ 38) salinity classes. With upwelling winds, the transport decreases and changes sign, and mixing mainly involves saltier (S > 38) waters. In all cases, mixing is enhanced when a finer 0.5-km horizontal resolution is employed.  相似文献   

Wireless technologies for the monitoring of strategic civil infrastructures: an ambient vibration test on the Fatih Sultan Mehmet Suspension Bridge in Istanbul, Turkey   总被引：1，自引：1，他引：0  

M. Picozzi  C. Milkereit  C. Zulfikar  K. Fleming  R. Ditommaso  M. Erdik  J. Zschau  J. Fischer  E. Şafak  O. Özel  N. Apaydin 《Bulletin of Earthquake Engineering》2010,8(3):671-691

Rapid improvements in telemetry technology and the general decrease in communication costs have raised a growing interest in low-cost wireless sensing units. This is especially the case for structural monitoring purposes, where they are becoming a more valuable alternative to conventional wired monitoring system. The main advantages associated with the use of wireless sensing unit include a considerable decrease in installation costs, decentralization of data analysis, and the possibility of broadening the functional capabilities by exploiting the use, at the same time and place, of different sensors. In this work, the design of a low-cost wireless sensing unit able both to collect, analyze, store, and communicate data and estimated parameters is presented. The suitability of a network of these low-cost wireless instruments for monitoring the vibration characteristics and dynamic properties of strategic civil infrastructures is validated during a ambient vibration recording field test on the Fatih Sultan Mehmet Bridge in Istanbul, Turkey.  相似文献   

Pretreatment of Olive Oil Mill Wastewater by Two Different Applications of Fenton Oxidation Processes     

Celalettin Özdemir  Hayrunnisa Tezcan  Serkan Sahinkaya  Erkan Kalipci 《洁净——土壤、空气、水》2010,38(12):1152-1158

The removal of chemical oxygen demand (COD) and phenol from olive oil mill wastewaters (OOMW) was investigated experimentally by using conventional Fenton (CFP) and Fenton type processes (FTP) with zero valent iron (ZVI). Different operational parameters such as initial pH, Fe²⁺, Fe⁰, and H₂O₂ concentrations were examined. Kinetic studies in terms of COD and phenol removals for both CFP and FTP were performed. The original pH value (4.6) of OOMW for CFP was found as the optimum pH. The determined optimum conditions are [Fe²⁺] = 1500 mg L^?1, [H₂O₂] = 1750 mg L^?1, and pH = 4.6 for CFP; [Fe⁰] = 2000 mg L^?1, [H₂O₂] = 2000 mg L^?1, and pH = 3 for FTP. 82.4% COD and 62% phenol removals were performed under the optimum conditions by CFP, while 82% COD and 63.4% phenol were removed by FTP. According to the results of kinetic studies, it was observed that COD and phenol were removed by FTP more rapidly, compared to CFP. Consequently, it was determined that both CFP and FTP were effective processes for the pretreatment of OOMW.  相似文献   

Södra Finlands blocksänkor     

fil. dr. Geogr. GUY SÖDERMAN 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2013,113(1):77-81

Söderman, G.: Södra Finlands blocksänkor. Geografisk Tidsskrift, 82, 77–81, November 1. 1982.

Map analysis and field inventory show that there are about 20000 boulder depressions in Finland south of 64°N. The features are most common in blocky till areas close to fracture zones in the bedrock. The depressions range in altitude from above the highest shore-line down to 25–30 m above present sea-level. They are youngest in the NW part. Some depressions show surface patterns.

SAMMANDRAG

Blocksänkor är frostmarksformer med en huvudsakligen vertikal sortering som ett resultat av differentiell uppfrysning av blockrikt utgångsmaterial. De framställer inga klimatiska kriteria om utbildningstid och -förhållanden. Däremot här de till områden med sasängbetonad frostaktivitet, och om ej inskränkta till nedisade omräden, trots typiska fär dessa. Blocksänkorna är den mest utbredda och största frostmarksform inom den fennoskandiska skogsregionen i dag.  相似文献   

Forskningssamarbetet i Norden     

OLAVI GRANÖ 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2013,113(1)

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Comparison of 2D versus 3D modeling approaches for the analysis of the concrete faced rock‐fill Cokal Dam     

Yalin Arici  Halil Fırat Özel 《地震工程与结构动力学》2013,42(15):2277-2295

This paper's primary purpose is to compare the 2D and 3D analysis methodologies in investigating the performance of a concrete faced rock‐fill dams under dynamic loading conditions. The state of stress on the face plate was obtained in both cases using a total strain based crack model to predict the spreading of cracks on the plate and the corresponding crack widths. Results of the 2D and 3D analyses agree well. Although significantly more demanding, 3D analyses have the advantage of predicting the following: (i) the opening of the vertical construction joints; (ii) the cracking at the valley sides; and (iii) the crushing of the plate during the seismic action. During the earthquake loading, the cracking predicted at the base of the face plate after the impounding spread significantly towards the crest of the dam; however, the crack widths are obtained relatively small. Crushing of the face plates at the construction joints is the primary cause of the large scale cracking predicted on the face plate for high intensity earthquakes. Earthquake induced permanent deformation of the fill increases the compressive stresses on the face plate, thereby reducing the minute cracking on the plate. However, this effect also leads to significant increases in the residual openings at the construction joints and at the plinth level. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

Reliability of calibration of a monthly rainfall-runoff model: the semiarid case / Validité de l'étalonnage d'un modèle pluie-débit à pas de temps mensuel: cas d'un bassin semi aride     

A. H. M. GÖRGENS 《水文科学杂志》2013,58(4):485-498

ABSTRACT

A monthly conceptual rainfall—runoff model that enjoys fairly widespread use in South Africa was calibrated for each of 50 calibration samples of lengths 3–20 years, drawn from a synthetic 101-year semiarid streamflow time series generated with the Stanford Watershed Model. The ability of Pitman's model to reconstruct the original 101 years of monthly streamflow for each of the 50 calibrations was then examined against a set of statistics of monthly and annual streamflows. The variabilities of key model parameters associated with different lengths of calibration period were also investigated. The results show that it is well worthwhile to increase the calibration period to about 15 years in order to reduce errors in reconstructed flow statistics. Merely increasing the length of calibration period from 6 to 10 years may decrease the error in most regenerated flow statistics by 30–50%. A fair amount of variability in “optimum” parameters, however, seems unavoidable, even at longer calibration periods, though this may also partly be due to imperfect model calibration. The effects of this variability are greatly attenuated in the reconstructed flow statistics due to parameter interdependence.  相似文献   

On the Use of Crushed Recycled Glass Instead of Silica Sand in Dual‐Media Filters     

Elif Soyer  Ömer Akgiray  Nursen Öz Eldem  Ahmet Mete Saatçı 《洁净——土壤、空气、水》2013,41(4):325-332

Crushed recycled glass was evaluated as an alternative to silica sand in dual‐media filters. Pilot scale inline filtration experiments were carried out using raw waters from three different water sources with turbidities between 6.0 and 14.0 NTU. Two physically identical filter columns were operated in parallel in the experiments. One filter consisted of 62.5 cm silica sand and 41.5 cm anthracite coal, whereas the other filter contained 62.5 cm crushed recycled glass plus 41.5 cm anthracite coal. The total bed depth was 104 cm for both filters. The properties of the media were as follows: Glass effective size = 0.77 mm, uniformity coefficient = 1.41. Sand effective size = 0.79 mm, uniformity coefficient = 1.33. Coal effective size = 1.45 mm, uniformity coefficient = 1.39. Experiments were repeated five times as follows: (i) Without the use of a coagulant, (ii–iii) with 5 and 10 mg/L of alum, and (iv–v) with 5 and 10 mg/L of ferric chloride. The filtration rate used was 11.5 m/h. Turbidity, particle counts, and head losses were measured and compared as functions of time. The following were observed: (i) Effluent turbidities and particle counts of the two filters were very close, i.e., essentially the same effluent quality was obtained when crushed glass was used instead of silica sand. (ii) In the majority of the tests, the filter with crushed glass generated both a smaller clean‐bed head loss and smaller clogging head losses than those of the filter containing sand. It is concluded that crushed glass may be a good alternative to silica sand in dual‐media filtration.  相似文献