Impact of Dam and Reservoir Parameters on Peak Breach Discharge Predictions for Two Models

Impact of parameter variation relative to prediction of peak breach discharge was explored using two computational models. Comparisons were against two physical tests of contrasting material properties and against a large synthetic set. Synthetic set was developed using a peak discharge equation and height and storage of failed dams. Varied parameters were height, storage volume, reservoir shape, and material rate. Physical tests: first model predicted high and early; second matched magnitude and timing well. Synthetic set: peak discharge responsive to height and storage in both models; erodibility in one. Low response to shape suggests height, storage, and approximate shape are adequate to describe reservoir. Synthetic set baseline slopes observed similar to prediction equation; attributed to observed sensitivity to storage, and thus to height-storage relation of study. For parameters used to match prediction equation, material described in first model was weak and coarse, while moderately erodible yet of competent strength in second.Biosystems and Agricultural Engineerin

Aquilegia, Vol. 32 No. 3, Fall 2008, Newsletter of the Colorado Native Plant Society

https://epublications.regis.edu/aquilegia/1125/thumbnail.jp

Cytotoxicity Effects of Different Surfactant Molecules Conjugated to Carbon Nanotubes on Human Astrocytoma Cells

Phase contrast and epifluorescence microscopy were utilized to monitor morphological changes in human astrocytoma cells during a time-course exposure to single-walled carbon nanotube (SWCNT) conjugates with different surfactants and to investigate sub-cellular distribution of the nanotube conjugates, respectively. Experimental results demonstrate that cytotoxicity of the nanotube/surfactant conjugates is related to the toxicity of surfactant molecules attached on the nanotube surfaces. Both sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (SDBS) are toxic to cells. Exposure to CNT/SDS conjugates (0.5 mg/mL) for less than 5 min caused changes in cell morphology resulting in a distinctly spherical shape compared to untreated cells. In contrast, sodium cholate (SC) and CNT/SC did not affect cell morphology, proliferation, or growth. These data indicate that SC is an environmentally friendly surfactant for the purification and dispersion of SWCNTs. Epifluorescence microscopy analysis of CNT/DNA conjugates revealed distribution in the cytoplasm of cells and did not show adverse effects on cell morphology, proliferation, or viability during a 72-h incubation. These observations suggest that the SWCNTs could be used as non-viral vectors for diagnostic and therapeutic molecules across the blood–brain barrier to the brain and the central nervous system

Key success factors of starting e-commerce projects in the Czech Republic

The aim of the thesis is to map the key success factors of starting companies operating in e-commerce, namely in the sector of non-food consumer goods in the Czech Republic. To this end, the theoretical part of the thesis contains a synthesis of published knowledge regarding the key success factors in e-commerce, which is expanded with information from studies and articles focusing on current events in the Czech online scene. The practical part of the work then, using semi-structured interviews with representatives of successful e-shops and with specialists from various e-commerce fields, clarifies the white spots in the theory and answers what factors are perceived as key success factors for starting B2C e-shops in the Czech Republic. These factors are mainly right choice of the offered goods, e-shop brand, knowledge in the field of the goods sold, effective performance advertising, SEO and supplier relationships. Very important supporting success factors then include energy, time and business skills of the e-commerce founder.Cílem diplomové práce je zmapovat klíčové faktory úspěchu začínajících podniků působících v e-commerce, a to v odvětví non-food spotřebního zboží v ČR. Za tímto účelem je v teoretické části provedena syntéza publikovaných poznatků ohledně faktorů úspěchu v e-commerce, která je rozšířena o informace ze studií a článků zaměřujících se na aktuální dění v české onlinové scéně. Praktická část práce poté pomocí polostrukturovaných rozhovorů s představiteli úspěšných e-shopů a se specialisty z různých oblastí e-commerce objasňuje bílá místa v teorii a odpovídá na to, jaké faktory začínajících e-shopů v B2C v ČR jsou vnímány jako klíčové. Těmito faktory jsou především správná volba nabízeného zboží, brand e-shopu, znalosti v oblasti prodávaného zboží, efektivní výkonnostní reklama, SEO a dodavatelské vztahy. Mezi velmi důležité podpůrné faktory úspěchu pak patří energie, čas a byznysové dovednosti zakladatele e-shopu

Ab initio molecular dynamics and simulation of Na3F cluster femtosecond spectrum

Department of Physical and Macromolecular ChemistryKatedra fyzikální a makromol. chemiePřírodovědecká fakultaFaculty of Scienc

To the specifics of the settlement development during the Roman Period in the region north to the Middle Danube

The study examines changes of the settlement pattern during the first four centuries A. D. Interpreting the discontinuity of the sites as an archaeological reflection of their succesive extinction attemts to place it in the wider context of historical events from the Marcomannics wars in 2. century A. D. to the beginning of the Migrations Period at the end of 4. century

Die Verbündeten Roms nördlich des pannonischen Limes und ihre Nobilität während der Spätantike

Tejral Jaroslav. Die Verbündeten Roms nördlich des pannonischen Limes und ihre Nobilität während der Spätantike . In: La noblesse romaine et les chefs Barbares du IIIe au VIIe siècle. Actes du Colloque International organisé par le Musée des Antiquités Nationales et l'URA 880 du CNRS (Saint-Germain-en-Laye, 16-19 mai 1992) Chelles : Association française d'archéologie mérovingienne, 1995. pp. 139-154. (Mémoires de l'Association française d'archéologie mérovingienne

Ab initio molecular dynamics and simulation of Na3F cluster femtosecond spectrum

Department of Physical and Macromolecular ChemistryKatedra fyzikální a makromol. chemiePřírodovědecká fakultaFaculty of Scienc