Assessment of the application of advanced technologies to subsonic CTOL transport aircraft

Design studies of the application of advanced technologies to future transport aircraft were conducted. These studies were reviewed from the perspective of an air carrier. A fundamental study of the elements of airplane operating cost was performed, and the advanced technologies were ranked in order of potential profit impact. Recommendations for future study areas are given

Correspondence between HBT radii and the emission zone in non-central heavy ion collisions

In non-central collisions between ultra-relativistic heavy ions, the freeze-out distribution is anisotropic, and its major longitudinal axis may be tilted away from the beam direction. The shape and orientation of this distribution are particularly interesting, as they provide a snapshot of the evolving source and reflect the space-time aspect of anisotropic flow. Experimentally, this information is extracted by measuring pion HBT radii as a function of angle with respect to the reaction plane. Existing formulae relating the oscillations of the radii and the freezeout anisotropy are in principle only valid for Gaussian sources with no collective flow. With a realistic transport model of the collision, which generates flow and non-Gaussian sources, we find that these formulae approximately reflect the anisotropy of the freezeout distribution.Comment: 9 pages, 8 figure

ENSO-PDO rainfall relationships in the MCBR

The Mediterranean California Border Region (MCBR) rainfall's relationship with El Nino-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO) is reexamined for the period 1951–2014. When stratifying data by ENSO events we found that strong events of either sign yield the highest ENSO–rainfall correlation; but when the stratification was done by rainfall the wet seasons yield the highest ENSO–rainfall correlation. Most strong ENSO events have the same sign as PDO; but the ENSO–rainfall correlation for all ENSO–PDO same-sign events is almost undistinguishable from the full-record's correlation. Timewise stratification shows that 30-year climatological values (MCBR precipitation, PDO and ENSO) and ENSO–rainfall correlations have decreased in recent years

The role of Dark Matter interaction in galaxy clusters

We consider a toy model to analyze the consequences of dark matter interaction with a dark energy background on the overall rotation of galaxy clusters and the misalignment between their dark matter and baryon distributions when compared to {\Lambda}CDM predictions. The interaction parameters are found via a genetic algorithm search. The results obtained suggest that interaction is a basic phenomenon whose effects are detectable even in simple models of galactic dynamics.Comment: RevTeX 4.1, 5 pages, 3 figure

Systemic Failure to Appear in Court

This Article aims to reorient the conversation around “failure-to-appear” (FTA) in criminal court. Recent policy and scholarship have addressed FTA mostly as a problem of criminal defendants in connection with questions about how bail systems should operate. But ten years of data from Philadelphia reveal a striking fact: it is not defendants who most frequently fail to appear but rather the other parties necessary for a criminal proceeding—witnesses and lawyers. Between 2010 and 2020, an essential witness or private attorney failed to appear for at least one hearing in 53% of all cases, compared to a 19% FTA rate for defendants. Police officers, victims, other witnesses, and private attorneys each failed to appear at rates substantially higher than defendants. In short: FTA is a systemic phenomenon. The systemic nature of FTA calls into question the extreme asymmetry between the treatment of defendant and non-defendant FTA. Bail reform has generated intense debates about when cash bail, detention, and other pretrial interventions are warranted to ensure defendants’ appearance. Given that witnesses and lawyers also have a legal duty to appear, the systemic nature of FTA requires more comprehensive thinking about how best to get people to court and when restrictions on liberty are appropriate. Systemic FTA also has systemic consequences, because when essential witnesses don’t show, cases are dismissed or withdrawn. FTA thus serves a regulatory function by providing a check on the nature and volume of criminal adjudications. Sometimes this function seems beneficial, as when witness FTA carries information about the strength or worth of the case, but other times it seems like a problem. The sheer volume of police officer FTA creates an impression of arbitrariness, dysfunction, and disrespect. Other aspects of this regulatory dynamic are more ambiguous. For instance, victim FTA rates are so persistently high that many appear to be effectively “opting out” of the criminal proceeding. Does this tell us that certain classes of harm are better dealt with outside of the criminal legal process? Or are we, as a society, losing something valuable when cases are dismissed due to victim or witness nonappearance? More generally, when is witness FTA a problem and when is it a healthy check on the system? This Article aims to draw attention to systemic FTA as an important feature of contemporary U.S. criminal legal systems, identify the core questions that it raises, and lay a path for future research

Assessment of RegCM4 simulated inter-annual variability and daily-scale statistics of temperature and precipitation over Mexico

The skill of a regional climate model (RegCM4) in capturing the mean patterns, interannual variability and extreme statistics of daily-scale temperature and precipitation events over Mexico is assessed through a comparison of observations and a 27-year long simulation driven by reanalyses of observations covering the Central America CORDEX domain. The analysis also includes the simulation of tropical cyclones. It is found that RegCM4 reproduces adequately the mean spatial patterns of seasonal precipitation and temperature, along with the associated interannual variability characteristics. The main model bias is an overestimation of precipitation in mountainous regions. The 5 and 95 percentiles of daily temperature, as well as the maximum dry spell length are realistically simulated. The simulated distribution of precipitation events as well as the 95 percentile of precipitation shows a wet bias in topographically complex regions. Based on a simple detection method, the model produces realistic tropical cyclone distributions even at its relatively coarse resolution (dx = 50 km), although the number of cyclone days is underestimated over the Pacific and somewhat overestimated over the Atlantic and Caribbean basins. Overall, it is assessed that the performance of RegCM4 over Mexico is of sufficient quality to study not only mean precipitation and temperature patterns, but also higher order climate statistics

The recent rainfall climatology of the Mediterranean Californias

ABSTRACT In this work, recent rainfall data in a southwestern California station (San Diego) and a northwestern Baja California station (Ensenada) within a region called Mediterranean California, around 33ЊN, 117ЊW, are studied. Cumulative annual means are used as indicators of climatological variability; but the entire datasets are analyzed by modeling the histogram of each set as a Weibull distribution probability density function, f . The climatology of both stations, defined simply as the arithmetic average, is compared with their theoretical mean; that is, the first moment of f . It is assumed that this comparison would be indicative of the reliability of the available rainfall climatologies. If these assumptions hold, in particular if the data is indeed Weibull distributed, it can be concluded that the climatological annual mean precipitation in this region is slightly overestimated at this time