An experimental and analytical investigation of proprotor whirl flutter

The results of an experimental parametric investigation of whirl flutter are presented for a model consisting of a windmilling propeller-rotor, or proprotor, having blades with offset flapping hinges mounted on a rigid pylon with flexibility in pitch and yaw. The investigation was motivated by the need to establish a large data base from which to assess the predictability of whirl flutter for a proprotor since some question has been raised as to whether flutter in the forward whirl mode could be predicted with confidence. To provide the necessary data base, the parametric study included variation in the pylon pitch and yaw stiffnesses, flapping hinge offset, and blade kinematic pitch-flap coupling over a large range of advance ratios. Cases of forward whirl flutter and of backward whirl flutter are documented. Measured whirl flutter characteristics were shown to be in good agreement with predictions from two different linear stability analyses which employed simple, two dimensional, quasi-steady aerodynamics for the blade loading. On the basis of these results, it appears that proprotor whirl flutter, both forward and backward, can be predicted

The Decay Properties of the Finite Temperature Density Matrix in Metals

Using ordinary Fourier analysis, the asymptotic decay behavior of the density matrix F(r,r') is derived for the case of a metal at a finite electronic temperature. An oscillatory behavior which is damped exponentially with increasing distance between r and r' is found. The decay rate is not only determined by the electronic temperature, but also by the Fermi energy. The theoretical predictions are confirmed by numerical simulations

Panel discussion: inflation targeting

Monetary policy ; Banks and banking, Central ; European Central Bank

Thermal analysis of submicron nanocrystalline diamond films

The thermal properties of sub-μm nanocrystalline diamond films in the range of 0.37–1.1 μm grown by hot filament CVD, initiated by bias enhanced nucleation on a nm-thin Si-nucleation layer on various substrates, have been characterized by scanning thermal microscopy. After coalescence, the films have been outgrown with a columnar grain structure. The results indicate that even in the sub-μm range, the average thermal conductivity of these NCD films approaches 400 W m− 1 K− 1. By patterning the films into membranes and step-like mesas, the lateral component and the vertical component of the thermal conductivity, k<sub>lateral</sub> and k<sub>vertical</sub>, have been isolated showing an anisotropy between vertical conduction along the columns, with k<sub>vertical</sub> ≈ 1000 W m− 1 K− 1, and a weaker lateral conduction across the columns, with k<sub>lateral</sub> ≈ 300 W m− 1 K− 1

Barriers to Reliable Credibility Assessments: Domestic Violence Victim-Witnesses

This Article examines the challenges for victims of domestic violence appearing in court when the victim presents differently than the paradigmatic domestic violence victim. In particular, this Article analyzes the strategic dilemma of presenting a victim who refuses to admit (or cannot access or does not experience) fear of the batterer, and the victim who feels anger towards her assailant. This Article addresses possible policy and tactical responses to this challenge. Suggesting legislative changes that eliminate requirements that victims prove subjective fear of a battering partner, the Article further analyzes the use of expert witnesses to assist jurors and judges in understanding atypical victim behavior and testimony

The Justice System and Domestic Violence: Engaging the Case but Divorcing the Victim

This Article examines the development of an inverse relationship in the legal system between the concern accorded domestic violence cases and the concern accorded domestic violence victims. The Article analyzes both philosophical approaches and concrete mechanisms currently used by the justice system to address domestic violence. Concluding that the current system- though it signals a serious institutional attitude toward addressing domestic violence – has failed to increase victim safety, this Article advocates for a paradigm shift in the legal system’s approach to domestic violence. Specifically, the Article analyzes the viability of a paradigm shift in the philosophy behind current policies that emphasize intervention by system actors to a philosophy that focuses on victim safety. The Article demonstrates that an emphasis on victim safety would encourage system actors to tailor policies to the needs of specific cases and victims, would increase victim trust in the system, and result in better justice system outcomes

Money Can\u27t Buy You Love: Valuing Contributions by Nonresidential Fathers

Family law in the United States reflects and reinforces expectations about how fathers should interact with their children. Those expectations betray the legal system’s valuation of paternal roles in which financial contributions far outweigh other types of caretaking. This differential valuation, though advantageous to the overall wellbeing of some children, negatively affects low-income families, exacerbates cultural and societal pressures that drive men from being engaged parents, and compels mothers who seek paternal engagement to parent alone. As the populations of absent fathers and of fathers who are unable to meet their child support obligations increase, it is worth reevaluating the relative value the legal system assigns to paternal financial contributions and to caretaking. By recalibrating their relative worth so that the legal system holds the value of both paternal roles in equipoise, child support and paternal engagement could mutually reinforce each other and together enhance opportunities for fathers, mothers, and children

Book Review: Casting Off the Canon: Family Law Reimagined

Jill Hasday\u27s book, Family Law Reimagined, offers a clear-eyed vision of what family law is, what it is not, and where it might be headed. Hasday considers family law\u27s canon-the set of principles by which we have come to characterize family law-and then debunks the canon by methodically setting forth each notion and illustrating its inaccuracies or limitations. In doing so, Hasday urges the reader to clear the noise of the canon and to see the law in all its messy inconsistencies and shortcomings