Principal Characteristics of Power Reactors

2011 ◽  
pp. 31-58
Keyword(s):  
Principal Characteristics

scholarly journals Influence of the Submerged Entry Nozzle’s Bottom Well on the Characteristics of Its Exit Jets

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 398
Author(s):  
Jesus Gonzalez-Trejo ◽  
Cesar A. Real-Ramirez ◽  
Jose Raul Miranda-Tello ◽  
Ruslan Gabbasov ◽  
Ignacio Carvajal-Mariscal ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Liquid Steel ◽  
Mold Wall ◽  
Casting Machine ◽  
Submerged Entry Nozzle ◽  
Central Plane ◽  
Impact Point ◽  
Single Vortex ◽  
Hydrodynamic Analysis ◽  
Principal Characteristics

In vertical continuous casting machines the liquid steel from the tundish is poured into the mold through the Submerged Entry Nozzle (SEN). The shape and direction of the SEN exit jets affect the liquid steel dynamics inside the mold. This work quantifies the effect of the SEN pool on the principal characteristics of the jets emerging from it, precisely, the shape, the spread angles, and the mold impact point. Experimental and numerical simulations were carried out using a SEN simplified model, a square-shaped bore nozzle with square-shaped outlet ports whose length is minimal. These experiments showed two well-defined behaviors. When a single vortex dominates the hydrodynamics inside the simplified SEN, the exit jets spread out and are misaligned about the mold’s central plane. On the contrary, when the inner flow pattern shows two vortexes, the exit jets are compact and parallel to the mold wide walls. The measured difference on the jet’s falling angles is 5°, approximately, which implies that in an actual casting machine, the impingement point at the narrow mold wall would have a variation of 0.150 m. This hydrodynamic analysis would help design new SENs for continuous casting machines that improve steel quality.

scholarly journals Oscillating foils of high propulsive efficiency

1998 ◽  
Vol 360 ◽  
pp. 41-72 ◽  
Author(s):  
J. M. ANDERSON ◽  
K. STREITLIEN ◽  
D. S. BARRETT ◽  
M. S. TRIANTAFYLLOU
Keyword(s):  
Reynolds Number ◽  
High Efficiency ◽  
Leading Edge ◽  
Half Cycle ◽  
Trailing Edge ◽  
Propulsive Efficiency ◽  
Principal Characteristics ◽  
Theoretical Predictions ◽  
Power Measurements ◽  
Oscillating Foils

Thrust-producing harmonically oscillating foils are studied through force and power measurements, as well as visualization data, to classify the principal characteristics of the flow around and in the wake of the foil. Visualization data are obtained using digital particle image velocimetry at Reynolds number 1100, and force and power data are measured at Reynolds number 40 000. The experimental results are compared with theoretical predictions of linear and nonlinear inviscid theory and it is found that agreement between theory and experiment is good over a certain parametric range, when the wake consists of an array of alternating vortices and either very weak or no leading-edge vortices form. High propulsive efficiency, as high as 87%, is measured experimentally under conditions of optimal wake formation. Visualization results elucidate the basic mechanisms involved and show that conditions of high efficiency are associated with the formation on alternating sides of the foil of a moderately strong leading-edge vortex per half-cycle, which is convected downstream and interacts with trailing-edge vorticity, resulting eventually in the formation of a reverse Kármán street. The phase angle between transverse oscillation and angular motion is the critical parameter affecting the interaction of leading-edge and trailing-edge vorticity, as well as the efficiency of propulsion.

Breast Cancer in Childhood

1968 ◽  
Vol 54 (5) ◽  
pp. 369-377 ◽  
Author(s):  
Umberto Veronesi ◽  
Lorenzo Zingo ◽  
Bruno Salvadori
Keyword(s):  
Breast Cancer ◽  
Surgical Procedure ◽  
Radical Mastectomy ◽  
Principal Characteristics ◽  
Simple Mastectomy ◽  
Cancer In Children

A case of breast cancer in a 8-year old girl is described, and 23 cases of breast cancer in children previously reported in the literature are analysed. The principal characteristics of breast cancer in children, unlike breast cancer in adults, seem to be a better prognosis, not depending on the surgical procedure (excision, simple mastectomy or radical mastectomy) and the frequent secretive appearance of the neoplasm, always of ductal origin.

Investigation of principal characteristics of a laser projection microscope

1976 ◽  
Vol 6 (1) ◽  
pp. 17-22 ◽  
Author(s):  
K I Zemskov ◽  
A A Isaev ◽  
M A Kazaryan ◽  
G G Petrash
Keyword(s):  
Principal Characteristics

scholarly journals From Unicorns to Mules: Phillip Pettit, Hannah Arendt, and the Liberal Human Rights Regime

2021 ◽  
Author(s):  
◽  
Sebastiaan Bierema
Keyword(s):  
Human Rights ◽  
Hannah Arendt ◽  
Direct Action ◽  
Current Approach ◽  
Power Politics ◽  
Principal Characteristics ◽  
Autonomous Action ◽  
Human Rights Regime ◽  
Rights Discourse ◽  
Liberal Approach

<p>The research presented here is an effort to interpret the discrepancy between the theoretical inalienability of human rights and the ease with which they are alienated in practice; a paradox Hannah Arendt regarded as the most conspicuous and cruel contradiction of human rights discourse. Proponents of the contemporary human rights regime have recognised that two principal characteristics of liberal human rights politics—namely, the double appellation of the Rights of Man and Citizen and an insistence on sovereignty and power-politics—directly contribute to this paradox. Nonetheless, they deem the current approach to combating rights violations to be ‘the best we can hope for’. After discussing this pragmatic liberal approach, this paper continues by analysing the alternative approaches championed by two republican traditions which criticise liberal human rights—Pettit’s neo-republicanism and Arendt’s participatory republicanism. The former of these proposes an institutional commitment to the rights of the citizen, whereas the latter deems the direct action of political subjects to be the most effective form of guaranteeing written rights in practice. Finally, in agreement with Arendt’s thought, this paper argues that while liberal power-politics and neo-republican institutionalism have their place in human rights politics, rights are at their most secure as expressions of autonomous action.</p>

scholarly journals Social and biological issues in infant survivorship among Danish cohorts born between 1982 and 1990

1996 ◽  
pp. 82-100
Author(s):  
Hans O. Hansen
Keyword(s):  
Birth Weight ◽  
Strong Support ◽  
General Question ◽  
Birth Cohorts ◽  
Principal Characteristics ◽  
Individual Level ◽  
Infant Deaths ◽  
Intermediate Variable ◽  
The Individual ◽  
Official Records

The purpose of this project is to identify possible differentials in the infant survivorship of the Danish cohorts bom between 1982 and 1990. The principal characteristics to be considered are gender and birth weight. Our data consist of official records of live births and infant deaths linked at the individual level. We report some rather detailed measurements of the survivorship impact of sex and birth weight in the framework of logistic regression and loglinear modeling. This paper gives strong support to sex and birth weight as major determinants of infant survivorship. Falling infant mortality is closely associated with increasing expected birth weight over the birth cohorts considered. The present paper should be seen as an appetizer for addressing the more general question of birth weight as an intermediate variable for survivorship impacts of biosocial factors related to the parents and to intrauterine gestation.

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