TY  - JOUR
A1  - Franke, Thomas
A1  - Bosis, R.
A1  - Napoli, M.-D.
T1  - Über das Internet steuerbarer Gebläseprüfstand mit einstellbaren Eintrittsleitschaufeln
JF  - Virtuelle Instrumente in der Praxis : Begleitband zum Kongreß VIP 2001 / Rahman Jamal ; Hans Jaschinski
Y1  - 2001
SN  - 3-7785-2829-7
N1  - Serie Praxiswissen Elektronik-Industrie : Messtechnik
SP  - 219
EP  - 225
PB  - Hüthig Verlag
CY  - Heidelberg [u.a.]
ER  - 
TY  - JOUR
A1  - Gerhardt, Hans Joachim
A1  - Konrath, Bernd
A1  - Lieb, Rolf-Dieter
T1  - Zur Druckbelüftung von Sicherheitstreppenräumen
JF  - vfdb-Zeitschrift. 51 (2002), H. 3
Y1  - 2002
SN  - 0042-1804
N1  - Veröffentlicht auch in: Brandschutz 2003, Heft 2, Bertelsmann-Fachzeitschriften-Supplement, S. 29-37
SP  - 122
EP  - 128
ER  - 
TY  - JOUR
A1  - Wahle, Michael
A1  - Weber, M.
T1  - Zum Stand von Komponentenmodellen im Rahmen der Fahrzeugsimulation
Y1  - 2001
N1  - Konferenz-Einzelbericht: Fahrwerk-Tech Tagung, München, 8. - 9. März 2001, Paper-Nr. 15, Seite 1-22
ER  - 
TY  - JOUR
A1  - Blome, Hans-Joachim
A1  - Priester, W.
T1  - Zum Problem des Urknalls: "Big Bang" oder "Big Bounce"?  Teil 2
JF  - Sterne und Weltraum. 26 (1987), H. 3
Y1  - 1987
SN  - 0039-1263
SP  - 140
EP  - 144
ER  - 
TY  - JOUR
A1  - Blome, Hans-Joachim
A1  - Priester, W.
T1  - Zum Problem des Urknalls
JF  - Sterne und Weltraum. 26 (1987), H. 2
Y1  - 1987
SN  - 0039-1263
SP  - 83
EP  - 89
ER  - 
TY  - JOUR
A1  - Overduin, James
A1  - Blome, Hans-Joachim
A1  - Hoell, Josef
T1  - Wolfgang Priester: from the big bounce to the Lambda-dominated universe
JF  - Naturwissenschaften
Y1  - 2007
SN  - 0028-1042
VL  - 94
IS  - 6
SP  - 417
EP  - 429
ER  - 
TY  - JOUR
A1  - Gerhardt, Hans Joachim
T1  - Windlastannahmen für große Industriehallen mit Flachdach
JF  - Die Bautechnik. 68 (1991), H. 3
Y1  - 1991
SN  - 0005-6820
SP  - 93
EP  - 97
ER  - 
TY  - JOUR
A1  - Gerhardt, Hans Joachim
A1  - Ebert, U.
T1  - Windklima und Immission. Vergleich von Messungen vor Ort und Modellmessungen im Windkanal
JF  - Staub, Reinhaltung der Luft. 51 (1991), H. 2
Y1  - 1991
SN  - 0039-0771
SP  - 57
EP  - 62
ER  - 
TY  - JOUR
A1  - Gerhardt, Hans Joachim
A1  - Janser, F.
T1  - Windbelastung belüfteter Fassadensysteme
JF  - Der Bauingenieur. 70 (1995), H. 5
Y1  - 1995
SN  - 0005-6650
SP  - 193
EP  - 201
ER  - 
TY  - JOUR
A1  - Hoeveler, B.
A1  - Bauknecht, André
A1  - Wolf, C. Christian
A1  - Janser, Frank
T1  - Wind-Tunnel Study of a Wing-Embedded Lifting Fan Remaining Open in Cruise Flight
JF  - Journal of Aircraft
N2  - It is investigated whether a nonrotating lifting fan remaining uncovered during cruise flight, as opposed to being covered by a shutter system, can be realized with limited additional drag and loss of lift during cruise flight. A wind-tunnel study of a wing-embedded lifting fan has been conducted at the Side Wind Test Facility Göttingen of DLR, German Aerospace Center in Göttingen using force, pressure, and stereoscopic particle image velocimetry techniques. The study showed that a step on the lower side of the wing in front of the lifting fan duct increases the lift-to-drag ratio of the whole model by up to 25% for all positive angles of attack. Different sizes and inclinations of the step had limited influence on the surface pressure distribution. The data indicate that these parameters can be optimized to maximize the lift-to-drag ratio. A doubling of the curvature radius of the lifting fan duct inlet lip on the upper side of the wing affected the lift-to-drag ratio by less than 1%. The lifting fan duct inlet curvature can therefore be optimized to maximize the vertical fan thrust of the rotating lifting fan during hovering without affecting the cruise flight performance with a nonrotating fan.
Y1  - 2020
U6  - http://dx.doi.org/10.2514/1.C035422
SN  - 1533-3868
VL  - 57
IS  - 4
PB  - AIAA
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Götten, Falk
A1  - Havermann, Marc
A1  - Braun, Carsten
A1  - Marino, Matthew
A1  - Bil, Cees
T1  - Wind-tunnel and CFD investigations of UAV landing gears and turrets – Improvements in empirical drag estimation
JF  - Aerospace Science and Technology
N2  - This paper analyzes the drag characteristics of several landing gear and turret configurations that are representative of unmanned aircraft tricycle landing gears and sensor turrets. A variety of these components were constructed via 3D-printing and analyzed in a wind-tunnel measurement campaign. Both turrets and landing gears were attached to a modular fuselage that supported both isolated components and multiple components at a time. Selected cases were numerically investigated with a Reynolds-averaged Navier-Stokes approach that showed good accuracy when compared to wind-tunnel data. The drag of main gear struts could be significantly reduced via streamlining their cross-sectional shape and keeping load carrying capabilities similar. The attachment of wheels introduced interference effects that increased strut drag moderately but significantly increased wheel drag compared to isolated cases. Very similar behavior was identified for front landing gears. The drag of an electro-optical and infrared sensor turret was found to be much higher than compared to available data of a clean hemisphere-cylinder combination. This turret drag was merely influenced by geometrical features like sensor surfaces and the rotational mechanism. The new data of this study is used to develop simple drag estimation recommendations for main and front landing gear struts and wheels as well as sensor turrets. These recommendations take geometrical considerations and interference effects into account.
Y1  - 2020
U6  - http://dx.doi.org/10.1016/j.ast.2020.106306
SN  - 1270-9638
VL  - 107
IS  - Art. 106306
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Gerhardt, Hans Joachim
T1  - Wind- und Temperatureinflüsse bei der Planung von Entrauchungseinrichtungen
JF  - VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 55 (2006), H. 3
Y1  - 2006
SN  - 0042-1804
SP  - 115
EP  - 121
ER  - 
TY  - JOUR
A1  - Blome, Hans-Joachim
T1  - Wie funktionieren die aktiven Kerne der Galaxien?
JF  - Naturwissenschaften. 76 (1989), H. 7
Y1  - 1989
SN  - 0028-1042
SP  - 310
EP  - 317
ER  - 
TY  - JOUR
A1  - Schmitz, Günter
A1  - Schmitt, H.J.
A1  - Dammann, H.
T1  - Weakly Guiding Semileaky Isolator with a Form-Birefringent Top Layer
JF  - Conference on Lasers and Electro-Optics ; (5, 1985, Baltimore, Md.) ; Conference on Lasers and Electro-Optics (CLEO '85) ; (1985.05.21-24 ; Baltimore, Md.)
Y1  - 1985
SP  - 260
PB  - Optical Society of America
CY  - Washington, DC
ER  - 
TY  - JOUR
A1  - Schirra, Julian
A1  - Bissonnette, William
A1  - Bramesfeld, Götz
T1  - Wake-model effects on induced drag prediction of staggered boxwings
JF  - Aerospace
Y1  - 2018
U6  - http://dx.doi.org/10.3390/aerospace5010014
SN  - 2226-4310
VL  - 5
IS  - 1
ER  - 
TY  - JOUR
A1  - Schmitz, Günter
A1  - Vom Hemdt, A.
A1  - Breitschuh, S.
A1  - Graber, S.
T1  - Virtuelle Praktika für die Ingenieurausbildung
JF  - NetWorlds : Leben und Arbeiten in vernetzten Welten ; VDE-Kongress 2002, 21. bis 23. Oktober 2002 in Dresden / Gesamtleitung: J. Eberspächer
Y1  - 2002
SN  - 3-8007-2723-4
SP  - 69
EP  - 74
PB  - VDE-Verl.
CY  - Berlin [u.a.]
ER  - 
TY  - JOUR
A1  - Mathiak, Gerhard
A1  - Willnecker, Rainer
A1  - Plescher, Engelbert
T1  - Vibrational effects on diffusion experiments
JF  - Microgravity science and technology : international journal for microgravity research and applications
Y1  - 2005
SN  - 0938-0108
VL  - Vol. 15
IS  - No. 1
SP  - 295
EP  - 300
ER  - 
TY  - JOUR
A1  - Gerhardt, Hans Joachim
A1  - Schönwald, J.
A1  - Konrath, B.
T1  - Verwendung von Leichtgas bei Brandsimulationen - unzulässig oder sinnvoll?
JF  - VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 56 (2007), H. 1
Y1  - 2007
SN  - 0042-1804
SP  - 29
EP  - 31
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
T1  - Verwendung eines neuronalen Reglers und evolutionärer Algorithmen zur Berechnung optimaler interplanetarer Sonnenseglerbahnen
JF  - Deutscher Luft- und Raumfahrtkongress 2003 : München, 17. bis 20. November 2003, Motto: 100 Jahre Motorflug - 112 Jahre Menschenflug: Visionen gestalten Zukunft / Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR). [Red.: Peter Brandt (verantwortlich)]. - Bd. 1. - (Jahrbuch ... der Deutschen Gesellschaft für Luft- und Raumfahrt)
Y1  - 2003
N1  - Deutscher Luft- und Raumfahrt-Kongreß <2003, München> ; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth ; DGLR-2002-089
SP  - 211
EP  - 218
CY  - Bonn
ER  - 
TY  - JOUR
A1  - Heierli, Joachim
A1  - Purves, Ross S.
A1  - Felber, Andreas
A1  - Kowalski, Julia
T1  - Verification of nearest-neighbours interpretations in avalanche forecasting
JF  - Annals of Glaciology
N2  - This paper examines the positive and negative aspects of a range of interpretations of nearest-neighbours models. Measures-oriented and distributionoriented verification methods are applied to categorial, probabilistic and descriptive interpretations of nearest neighbours used operationally in avalanche forecasting in Scotland and Switzerland. The dependence of skill and accuracy measures on base rate is illustrated. The purpose of the forecast and the definition of events are important variables in determining the quality of the forecast. A discussion of the application of different interpretations in operational avalanche forecasting is presented.
KW  - avalanche
Y1  - 2004
SN  - 1727-5644
VL  - 38
IS  - 1
SP  - 84
EP  - 88
ER  -