Single-phase mixing through a narrow gap

Mixing through narrow gaps connecting adjacent flow paths is an important mass and heat transfer process for many thermo-hydraulic applications. Such flows are considered balanced when the inlet flow speeds of adjacent subchannels are matched. In the present work, experimental observations are presented for balanced and unbalanced flows including the mixing coefficients and flow visualization within the gap. The large coherent structures are identified, with frequency in general agreement with those reported by previous investigators. To utilize Proper Orthogonal Decomposition (POD) for the discrete data yielded by PIV, we employ method of Singular Value Decomposition (SVD). The bulk of the mixing is attributed to the dominant modes and demonstrate that mixing rates estimated from velocity measurements are in fair agreement with mixing coefficients based on tracer concentration measurements

Logic-controlled solid state switchgear for 270 volts dc

A feasibility study to design and demonstrate solid state switchgear in the form of circuit breakers and a power transfer switch is described. The switchgear operates on a nominal 270 V dc circuit and controls power to a load of up to 15 amperes. One circuit breaker may be interconnected to a second breaker to form a power transfer switch. On-off and transfer functions of the breakers or the transfer switch are remotely controlled. A number of reclosures with variable time delay between tripout and reclosure are programmed and controlled by integrated analog and COSMOS logic circuits. A unique commutation circuit, that generates only minimal transient disturbance to either source or load, was developed to interrupt current flow through the main SCR switching element. Laboratory tests demonstrated performance of the solid state circuit breakers over specified voltage and temperature ranges

Bankruptcy--Section 70c--Recent Reactions To \u3cem\u3eConstance v. Harvey\u3c/em\u3e

Renewed interest in section 70c has developed recently, primarily because of several significant decisions in the federal courts. It is the purpose of this comment to consider the impact of these developments on the power of the trustee to avoid otherwise valid security devices

Impactite and pseudotachylite from Roter Kamm Crater, Namibia

Pseudotachylite is known to occur in a variety of geologic settings including thrust belts (e.g., the Alps and the Himalayas) and impact craters such as Roter Kamm, Namibia. Controversy exists, however, as to whether pseudotachylite can be produced by shock brecciation as well as by tectonic frictional melting. Also open to debate is the question of whether pseudotachylites form by frictional fusion or by cataclasis. It was speculated that the pseudotachylite at Roter Kamm was formed by extensional settling and adjustment of basement blocks during 'late modification stage' of impact. The occurrence of pseudotachylite in association with rocks resembling quenched glass bombs and melt breccias in a relatively young crater of known impact origin offers a rare opportunity to compare features of these materials. Petrographic, x-ray diffraction, and electron microprobe analyses of the impactites and pseudotachylites are being employed to determine the modes of deformation and to assess the role of frictional melting and comminution of adjacent target rocks

Mobilité de sexe et réussite scolaire au collégial

Cet article porte sur la vérification de certaines hypothèses relatives au lien entre sexe, identité de genre et réussite scolaire au collégial. Les chercheurs ont fait passer à tous les nouveaux inscrits au cégep d'Alma le questionnaire de BEM validé par Pelletier pour le Québec. Les résultats, exception faite de ce qui concerne les androgynes, semblent confirmer les hypothèses: ils indiquent que c'est le sexe plus que l'identité de genre qui influence la réussite scolaire au collégial et ce sont les étudiantes qui connaissent une véritable « mobilité de sexe » qui réussissent le mieux. Plus qu'une simple prise de distance du message social (transcendance des rôles sociaux de sexe), cette mobilité se traduit par une transgression de ce message social.This article examines various hypotheses describing the relationship between sex, gender identification and success at college. The authors administered the BEM questionnaire, validated in Quebec by Pelletier, to all newly enrolled students at Cegep Alma. The results show that except for androgynes, the hypotheses are confirmed: that sex more than gender identity influences success at college level; and that students who have "sexual mobility" have the highest success rate. This mobility seems to be manifested by a transgression of a social message which is more than a simple removal from this message ("transcendance of social sex roles").Este articulo estudia la verificacion de ciertas hipotesis sobre la relacion entre el sexo, la identidad del género y el éxito académico a nivel preuniversitario. Los investigadores aplicaron el cuestionario BEM, validado para el Québec por Pelletier, a todos los nuevos alumnos del colegio de Aima (Québec). Los resultados parecen confirmar que el sexo, mas que la identidad del género, tiene una influencia sobre el éxito académico a nivel preuniversitario excepto para androginos; y que los estudiantes con una verdadera "movilidad de sexo" obtienen un éxito mayor. Mas que un simple distanciamiento del mensaje social (la transcen-dencia de los papeles sociales del sexo), dicha movilidad se traduce en una transgresion de este mensaje social.Dieser Artikel behandelt die Verifikation gewisser Hypothesen beziiglich der Beziehung zwischen Geschlecht, sexueller Identitàt und Leistung auf dem College. Die Forscher haben aile neue Schiller des College von Alma den von Bern eingefuhrten und von Pelletier fur Quebec validierten Fragebogen ausftillen lassen. Abgesehen von den Zwittern scheinen die Ergebnisse die Hypothesen zu bestâtigen: der Erfolg im College hângt mehr vom Geschlecht ab als von der sexuellen Identitàt; aufierdem haben die Schiilerinnen mit richtiger "geschlechtsbezogener Mobilitât" den grôssten Erfolg. Uber eine einfache Abstandnahme gegeniiber der sozialen Regel (Transzendenz der geschlechtsbezogenen sozialen Rollen-verteilung) hinausgehend wird dièse Mobilitât zu einer Ubertretung dieser sozialen Regel