• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 239
  • 98
  • 60
  • 39
  • 16
  • 14
  • 14
  • 14
  • 14
  • 14
  • 14
  • 4
  • 3
  • 3
  • 2
  • Tagged with
  • 641
  • 81
  • 64
  • 53
  • 48
  • 47
  • 46
  • 46
  • 44
  • 42
  • 39
  • 38
  • 37
  • 32
  • 32
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Modelling and prediction of flashing flow in short tubes /

Padmaperuma, Dinnaga P., January 1992 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 77-80). Also available via the Internet.
2

Dynamic instabilities of tubes conveying fluid using the Timoshenko beam theory

Laithier, Bernard E. January 1975 (has links)
No description available.
3

Dynamic instabilities of tubes conveying fluid using the Timoshenko beam theory

Laithier, Bernard E. January 1975 (has links)
No description available.
4

Modélisation thermohydraulique de générateur de vapeur : développement de méthodes de couplage 1D/CFD-Milieux équivalents / Thermal and hydraulic modeling of Steam Generator : development of a method using a 1D/CFD-Porous Media coupling

Kalioudjoglou, Loïck 28 February 2019 (has links)
Le Générateur de Vapeur est un des composants majeurs des unités de production d’électricité permettant la propulsion des navires de Naval Group. Les phénomènes physiques mis en jeux dans ces échangeurs sont complexes à simuler en raison de la variété des topologies d’écoulement et des régimes de transfert thermique présents. Cette thèse s’emploie à développer un programme adapté à la modélisation des différents GV de Naval Group. La méthodologie mise en place propose un couplage entre un code 1D et un calcul CFD reposant sur l’approche des milieux équivalents. La modélisation des écoulements monophasiques au sein des échangeurs est abordée dans un premier temps avant de présenter la modélisation des écoulements diphasiques. L’intérêt de la méthode est mis en évidence par sa validation sur des appareils testés expérimentalement et en la confrontant avec d’autres approches numériques existantes. Les travaux proposent des solutions afin de modéliser des GV en serpentin et permettent d’envisager la simulation de géométries plus complexes. Le calcul des efforts hydrauliques et des échanges d’énergies entre le liquide, la vapeur et la paroi est détaillée. Par sa structure, le modèle tend à répondre à l’ensemble des configurations de GV envisageables. Différentes manières d’alimenter le modèle sont proposées en remplacement des corrélations empiriques existantes et permettent d’envisager de nouvelles solutions plus adaptées. / The steam generator is one of the major components of the power generation unit for the propulsion of Naval Group ships. The physical phenomena involved in these heat exchangers are complex to simulate because of the variety of flow patterns and heat transfer regimes. This thesis aims to develop a program adapted to the modeling of Naval Group’s steam generators. The developed methodology proposes a coupling between a 1D-code and CFD calculation based on the porous media approach. The modeling of monophasic flows within heat exchangers is first discussed before presenting that of two-phase flows. The method’s interest is highlighted by its validation on experimental test cases and by comparing it to other existing numerical approaches. The work brings solutions to model helically coiled steam generator and allow to consider the simulation of more complex geometries. The calculation of the hydraulic forces and energy exchanges between the liquid, the vapor and the tube’s wall is detailed. By its structure, the model tends to be able to represent all possible configurations of steam generators. Different ways of feeding this model are proposed to replace the existing empirical laws and make it possible to envisage new and more adapted solutions.
5

An analysis of third order intermodulation in vacuum tubes

Propp, Robert Rubel 08 1900 (has links)
No description available.
6

Theory of vacuum tube amplifiers

Miller, Burton Frank. January 1929 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1929. / Typescript. eContent provider-neutral record in process. Description based on print version record.
7

The unilateral dynamic characteristics of three-electrode vacuum tubes ...

Frayne, John George. January 1900 (has links)
Thesis (Ph. D.)--University of Minnesota, 1921. / "Reprinted from the Physical review, n. s., vol. XIX, no. 6, June, 1922."
8

Some performance characteristics of the Wisconsin high enthalpy shock tube

Suri, Rajinder Kumar, January 1965 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1965. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 195-196).
9

On the theory of tubes with two control grids their use as amplifier, modulators, and detectors,

Wing, Alexander Holbrook, January 1940 (has links)
Thesis (Ph. D.)--Columbia University. / Vita. "The specific data here presented concerns the pentagrid heptode, whose type designation is 6L7 for the metal envelope and 6L7G for the glass envelope."--Introd. "List of numbered references": p. 44-45.
10

Parameter characterization of disturbed signals by Fourier Transform analysis

Loisel, Ludovic. January 1979 (has links)
Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Page generated in 0.055 seconds