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Search Results: 1 - 10 of 501 matches for " Sedimentation "
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Ancient Glaciation of the Caucasus  [PDF]
Khazaradze Revaz, Kharadze Koba, Tsikarishvili Kukuri, Chartolani Giorgi
Open Journal of Geology (OJG) , 2018, DOI: 10.4236/ojg.2018.81004
Abstract: The paper deals with important, different views on the old glaciation of the Caucasus based on the literary sources and the latest data obtained through the expeditions. Our researches are mostly of complex character where petrographic, palynological and paleontological methods are widely used. The petrographic method allowed us to connect block debris of the moraine with the main centers and to determine the directions of the glaciers movement and their distribution boundaries. The palynological method was used to determine the genesis of loose sediments considered as moraines and their sedimentation conditions. The palynological spectrum of deposits shows that they are river sediments and their sedimentation took place under humid, moderately warm climate conditions that is not associated with glaciation.
Golden Research Thoughts , 2012, DOI: 10.9780/22315063
Abstract: India is continental land fulfill its water requirement from the monsoon rainfall which is uncertain with its intensity and time.In satisfying the need of agriculture, drinking water, industrial supply of water, dams are playing very important role. These tanks are suffering from the problem of sediment deposition which leads to decline the storage capacity of water with successive proceeding year.The Gondur tank is situated at Gondur village in Dhule taluka near Dhule city. This paper attempts to estimate the sedimentation with GIS techniques. It is estimated that sedimentation since from 1965 to 2010 is near about 378.35 metric tons and ground level rises near about 2.35 mt.
Sedimentation rate in dengue: an explanation based on proposed hypothesis on weight and erythrocyte sedimentation
Viroj Wiwanitkit
Iranian Journal of Medical Hypotheses & Ideas , 2010,
Abstract: "nDengue is an important mosquito borne viral infection. Focusing on the hematological finding in dengue, the erythrocyte sedimentation rate is varied. The exact explanation for this observation is unclear. Here, the author uses the previously already proposed hypothesis on weight and erythrocyte sedimentation for giving explanation of the observed sedimentation in dengue. This new explanation can fit with the already published observation in medical literature and indicates that erythrocyte sedimentation rate might be a useful predictor and classifier for kinds of dengue based on its severity.
Orogenesis: Cause of Sedimentary Formations  [PDF]
Guy Guy Berthault
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B005

Experiments on stratification discussed here have revealed the mechanical nature of lamination as well as the role of turbulent current as agent of stratification. They challenge Steno’s principle that superposed strata are successive sedimentary layers. They show that relative chronology should not be referred to as “stages” but as “sequences” of series. The rock formation studied by Lalomov shows that the duration of sedimentation could be considerably shorter than indicated by the Geological Time Scale. The latter scale corresponds to large marine transgressions and regressions that can result from the shift of polar axis following such major orogeneses as the Caledonian, Hercynian and Alpine.

Separation of Fe3O4 Nanoparticles from Water by Sedimentation in a Gradient Magnetic Field  [PDF]
I. Medvedeva, Iu. Bakhteeva, S. Zhakov, A. Revvo, M. Uimin, A. Yermakov, I. Byzov, A. Mysik, N. Shchegoleva
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.72009
Abstract: Sedimentation dynamics of magnetite (γ-Fe3O4) nanopowders (10 - 20 nm) in water in the presence of a gradient magnetic field was studied by optical and Nuclear Magnetic Resonance (NMR) relaxometry methods. The magnetic field B ≤ 0.3 T, dB/dz ≤ 0.13 T/cm was produced by the system of permanent strip magnets. The initial sedimentation rate of the nanoparticles in water and under magnetic fields is higher for less concentrated suspensions (c0 = 0.1 g/l) than for more concentrated ones (c0 = 1 g/l). This might be connected with the formation of gel structures due to strong magnetic attraction between ferromagnetic nanoparticles. In the gravitation field, the suspensions of the particles (10 - 20 nm) remain stable for over 20 hours. The sedimentation process can be greatly accelerated by the action of a vertical gradient magnetic field, reducing the sedimentation time down to several minutes. In a gradient magnetic field enhanced by a steel grid, sedimentation of the nanopowder (c0 = 0.1 g/l) for 180 minutes resulted in reduction of the iron concentration in water down to 0.4 mg/l. In flowing water regime, the residual iron concentration in water 0.3 mg/l is reached after 80 minutes.
Tidal Flat Sedimentation and Event

科学通报(英文版) , 1994,
Sorin Anghel,Carmen Mihaela Topal?
Annals : Food Science and Technology , 2010,
Abstract: Sedimentation of suspensions process is important, especially in pollution and biologic studies. Unlike usual methods,as those using pipettes, aerometer or balances, the optical ones are nondestructive and more accurate. During thesedimentation produced by the braked fall off the solid particles in suspension, fluctuations induced by an oppositevertical diffusion occur. We used a scattering method, based on the attenuation of a laser beam, which allows plottingsedimentation curves (the dependence on time of the suspended solid particles concentration) of the process. Weobtained an empirical relation describing sedimentation curves as a function of some main parameters (related toinitial concentration, height in suspension, dimensions of suspended solid particles) and we performed a simulation ofthe experimental sedimentation curves using the obtained relation and Mathcad software facilities. We notice that theresults of these studies allow using a fast method in order to determine the sedimentation time, which often can be verylong.
Criteria for Distinguishing Floc Sedimentation and Gel-Like Network Sedimentation of Cohesive Fine-Grained Sediment in a Turbulent Flow  [PDF]
Zhongfan Zhu
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.25004

The study on the criteria used to distinguish floc sedimentation and gel-like network sedimentation of cohesive fine-grained sediment in a turbulent flow has rarely been carried out. In this preliminary study, we derive three criteria to distinguish these two different sedimentation phases by considering the comparison of the time that a characteristic floc takes to settle through mean distance between characteristic flocs and the time that it takes to move through the same distance under the influence of a turbulent flow. These criteria incorporate physical and chemical factors that have been verified to have some influences on the sediment flocculation in some published literatures, and a simple analysis result is found to be consistent with our qualitative understandings of flocculation phenomenon of cohesive fine-grained sediment.

Adi??o de polieletrólito ao processo de flocula??o no pós-tratamento de lixiviado por coagula??o-flocula??o-sedimenta??o
Castro, Anelise Passerine de;Yamashita, Fábio;Silva, Sandra Márcia Cesário Pereira da;
Engenharia Sanitaria e Ambiental , 2012, DOI: 10.1590/S1413-41522012000100006
Abstract: the addition of polyelectrolyte flocculation process in the physical-chemical treatment by coagulation-flocculation-sedimentation effluent has been an alternative to obtain clarification of good quality in less time due to increased sedimentation rate. thus, this article aimed to determine the interrelationships between the ph gradient, flocculation, iron dosage and type of polyelectrolyte and evaluate the effect of this addition on color removal, cod and turbidity in the post-treatment of the leachate subjected to pretreatment biological. through the use of technical planning and analyzing the results, it was found that the polymer cationic charge introduced himself as the most efficient, achieving removals of up to 97.70% for true color, 81.52% for cod and 92.18% for turbidity.
Mieloma osteosclerótico (síndrome poems). Presentación de un caso: A case report
Hernández Díaz,Daniel; Lemus Sarracino,Agustín; Rivero Gort,Pedro M; Humaran Rodríguez,Lizet;
Revista de Ciencias M??dicas de Pinar del R?-o , 2005,
Abstract: a 42 year old caucasian female patient presented dermic hyperpigmentation in face, neck and upper thoracic part. depression, occipital headache and weight loss were other presenting symptoms; some whitish spots appeared in those hyperpigmented zones producing itch and burning pain. erytrosedimentation tests always had augmented level a marked erythrocyte aggregation and mild hepatomegaly were observed. diagnosis was not concluded in two skin biopsies performed. the report of bone marrow biopsy was: interstitial infiltration by mature and immature plasmatic cells a marked osteosclerosis associated with osteosclerotic myeloma. while expecting for the results of this study an acute fevered syndrome and sweating and severe dyspnea appeared and the patient died.
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