TY  - JOUR
A1  - Buniatyan, V.
A1  - Huck, Christina
A1  - Poghossian, Arshak
A1  - Aroutiounian, V. M.
A1  - Schöning, Michael Josef
T1  - BaxSr1-x TiO3/pc-Si heterojunction capacitance
JF  - Armenian journal of physics
Y1  - 2013
SN  - 1829-1171
VL  - 6
IS  - 4
SP  - 188
EP  - 197
PB  - National Academy of Sciences of Armenia
CY  - Yerevan
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
A1  - Valero, Daniel
T1  - Re-aeration on stepped spillways with special consideration of entrained and entrapped air
JF  - Geosciences
N2  - As with most high-velocity free-surface flows, stepped spillway flows become self-aerated when the drop height exceeds a critical value. Due to the step-induced macro-roughness, the flow field becomes more turbulent than on a similar smooth-invert chute. For this reason, cascades are oftentimes used as re-aeration structures in wastewater treatment. However, for stepped spillways as flood release structures downstream of deoxygenated reservoirs, gas transfer is also of crucial significance to meet ecological requirements. Prediction of mass transfer velocities becomes challenging, as the flow regime differs from typical previously studied flow conditions. In this paper, detailed air-water flow measurements are conducted on stepped spillway models with different geometry, with the aim to estimate the specific air-water interface. Re-aeration performances are determined by applying the absorption method. In contrast to earlier studies, the aerated water body is considered a continuous mixture up to a level where 75% air concentration is reached. Above this level, a homogenous surface wave field is considered, which is found to significantly affect the total air-water interface available for mass transfer. Geometrical characteristics of these surface waves are obtained from high-speed camera investigations. The results show that both the mean air concentration and the mean flow velocity have influence on the mass transfer. Finally, an empirical relationship for the mass transfer on stepped spillway models is proposed.
Y1  - 2018
SN  - 2076-3263
VL  - 8
IS  - 9
SP  - Article number 333
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
A1  - Valero, Daniel
T1  - Optical flow estimation in aerated flows
JF  - Journal of Hydraulic Research
N2  - Optical flow estimation is known from Computer Vision where it is used to determine obstacle movements through a sequence of images following an assumption of brightness conservation. This paper presents the first study on application of the optical flow method to aerated stepped spillway flows. For this purpose, the flow is captured with a high-speed camera and illuminated with a synchronized LED light source. The flow velocities, obtained using a basic Horn–Schunck method for estimation of the optical flow coupled with an image pyramid multi-resolution approach for image filtering, compare well with data from intrusive conductivity probe measurements. Application of the Horn–Schunck method yields densely populated flow field data sets with velocity information for every pixel. It is found that the image pyramid approach has the most significant effect on the accuracy compared to other image processing techniques. However, the final results show some dependency on the pixel intensity distribution, with better accuracy found for grey values between 100 and 150.
Y1  - 2016
U6  - https://doi.org/10.1080/00221686.2016.1173600
VL  - 54
IS  - 5
SP  - 575
EP  - 580
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
A1  - Erpicum, Sébastien
A1  - Tullis, Blanke P.
T1  - Advances in hydraulic structures engineering
JF  - Journal of Hydraulic Engineering
Y1  - 2020
U6  - https://doi.org/10.1061/(ASCE)HY.1943-7900.0001851
SN  - 0733-9429 (Druckausgabe)
SN  - 1943-7900 (Online-Ausgabe)
VL  - 147
IS  - 1
PB  - ASCE
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
A1  - Crookston, Brian M.
A1  - Valero, Daniel
T1  - Turbulent free-surface monitoring with an RGB-D sensor: the hydraulic jump case
JF  - Journal of Hydraulic Research
Y1  - 2020
U6  - https://doi.org/10.1080/00221686.2020.1844810
SN  - 1814-2079
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
T1  - Kamerabasierte Fließtiefen- und Geschwindigkeitsmessungen
JF  - Wasserwirtschaft
N2  - In der wasserbaulichen Forschung werden neben klassischen Messinstrumenten zunehmend kamerabasierte Verfahren genutzt. Diese erlauben neben der Bestimmung von Fließgeschwindigkeiten auch die Detektion der freien Wasseroberfläche oder zeitliche Vermessung von Kolken. Durch die hohen räumlichen und zeitlichen Auflösungen, welche neueste Kamerasensoren liefern, können neue Erkenntnisse in turbulenten, komplexen Strömungen gewonnen werden. Auch in der Praxis können diese Verfahren mit geringem Aufwand wichtige Daten liefern.
KW  - Wasserbau
KW  - Architektur
KW  - Wasserwirtschaft
KW  - Deutschland
Y1  - 2024
SN  - 0043-0978
VL  - 114
IS  - 4
SP  - 47
EP  - 53
PB  - Springer Vieweg
CY  - Wiesbaden
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
T1  - Fließcharakteristik und Sauerstoffeintrag bei selbstbelüfteten Gerinneströmungen auf Kaskaden mit gemäßigter Neigung
JF  - Österreichische Wasser- und Abfallwirtschaft
Y1  - 2011
SN  - 1613-7566 (E-Journal); 0945-358X (Print)
VL  - Vol. 63
IS  - Iss. 3-4
SP  - 76
EP  - 81
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
T1  - Non-intrusive detection of air–water surface roughness in self-aerated chute flows
JF  - Journal of hydraulic research
Y1  - 2013
SN  - 1814-2079 (E-Journal); 0022-1686 (Print)
VL  - Vol. 51
IS  - Iss. 3
SP  - 322
EP  - 329
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
T1  - Extreme flooding in Western Germany: some thoughts on hazards, return periods and risk
JF  - Hydrolink
N2  - The low-pressure system Bernd involved extreme rainfalls in the Western part of Germany in July 2021,
resulting in major floods, severe damages and a tremendous number of casualties. Such extreme events
are rare and full flood protection can never be ensured with reasonable financial means. But still, this
event must be starting point to reconsider current design concepts. This article aims at sharing some
thoughts on potential hazards, the selection of return periods and remaining risk with the focus on Germany.
Y1  - 2021
IS  - 4
SP  - 108
EP  - 113
PB  - International Association for Hydro-Environment Engineering and Research (IAHR)
CY  - Madrid
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
T1  - Developing flow in skimming flow regime on embankment stepped spillways
JF  - Journal of hydraulic research
Y1  - 2011
SN  - 1814-2079 (E-Journal); 0022-1686 (Print)
VL  - Vol. 49
IS  - Iss. 5
SP  - 639
EP  - 648
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
A1  - Wilhelmi, Herbert
A1  - Wimmer, W.
T1  - Influence of non-uniform material properties and water cooling on current density and temperature profiles in arc furnace elektrodes
JF  - Steel Research. 56 (1985), H. 11
Y1  - 1985
SN  - 0177-4832
SP  - 559
EP  - 564
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
A1  - Wilhelmi, Herbert
T1  - Kühlung von Lichtbogenofenelektroden durch Wärmerohre
JF  - Stahl und Eisen. 110 (1990), H. 8
Y1  - 1990
SN  - 0378-7559
SP  - 91
EP  - 98
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
A1  - Wilhelmi, Herbert
T1  - Cooling of arc furnace electrodes with heat pipes
JF  - Chemical Engineering & Technology. 14 (1991), H. 1
Y1  - 1991
SN  - 0930-7516
SP  - 45
EP  - 53
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
A1  - Voigt, H.
A1  - Friedrich, R.
T1  - Experimentelle und mathematische Untersuchungen zum Heißtransport von Stranggußbrammen
JF  - Stahl und Eisen. 110 (1990), H. 6
Y1  - 1990
SN  - 0378-7559
SP  - 97
EP  - 105
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
A1  - Léonard, G.
T1  - Hochtemperaturtechnik
JF  - Chemie Ingenieur Technik. 62 (1990), H. 3
Y1  - 1990
SN  - 0009-286X
SP  - 252
EP  - 256
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
T1  - Rechenmodelle zur Stromverdrängung in ein- und mehrphasigen elektrischen Leitungen komplexer Geometrie
JF  - Elektrowärme International, Edition B (Industrielle Elektrowärme). 48 (1990), H. 4
Y1  - 1990
SN  - 0340-3521
SP  - 199
EP  - 210
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
T1  - Hochtemperaturtechnik. Interne Arbeitssitzung des GVC-Fachausschusses 'Hochtemperaturtechnik'
JF  - Chemie Ingenieur Technik. 61 (1989), H. 6
Y1  - 1989
SN  - 0009-286X
SP  - 510
EP  - 512
ER  - 
TY  - JOUR
A1  - Bucur, Alexandru
A1  - Lazarescu, Lucian
A1  - Pop, Grigore Marian
A1  - Achimas, Gheorghe
A1  - Gebhardt, Andreas
T1  - Tribological performance of biodegradable lubricants under different surface roughness of tools
JF  - Academic Journal of Manufacturing Engineering
Y1  - 2019
SN  - 1583-7904
VL  - 17
IS  - 1
SP  - 172
EP  - 178
ER  - 
TY  - JOUR
A1  - Buck, Raphael
A1  - Läubli, Daniel
A1  - Meyer, Laura
A1  - Moosdorf, Andreas
T1  - Re-FRESH! Mit dem Frischesortiment punkten
JF  - Akzente
Y1  - 2013
IS  - 3
SP  - 36
EP  - 43
ER  - 
TY  - JOUR
A1  - Buck, H.
A1  - Schwarzer, Klemens
A1  - Meliß, Michael
A1  - Faber, Christian
T1  - Aus- und Weiterbildung am Solar-Institut Jülich
JF  - Energiewirtschaftliche Tagesfragen. 44 (1994), H. 9
Y1  - 1994
SN  - 0720-6240
SP  - 65
EP  - 68
ER  -