How Low Can You Go? New Bounds on the Biplanar Crossing Number of Low-dimensional Hypercubes

In this note we provide an improved upper bound on the biplanar crossing number of the 8-dimensional hypercube. The k-planar crossing number of a graph cr k ( G) is the number of crossings required when every edge of G must be drawn in one of k distinct planes. It was shown in [2] that cr 2 ( Q 8 ) ≤ 256 which we improve to cr 2 ( Q 8 ) ≤ 128. Our approach highlights the relationship between symmetric drawings and the study of k-planar crossing numbers. We conclude with several open questions concerning this relationship

Evaluating Net-Zero Energy Houses from the U.S. Department of Energy Solar Decathlon 2011

The Solar Decathlon is a two year, international project where university students compete to design, build, and test energy-efficient, net-zero homes. By definition, net-zero energy houses annually produce as much electricity as they consume. The 2011 Solar Decathlon, held in Washington D.C., had 19 university teams from around the world. Unfortunately, many past Solar Decathlon houses have traditionally been very costly. However, the 2011 Solar Decathlon was the first competition to have an affordability contest. The affordability contest required each home to be valued under an estimated builder’s cost of $250,000, forcing the teams to select economically feasible solutions for creating net zero energy houses, finding super-efficient, solar- powered, and affordable houses can be done by evaluating the contests associated with the Solar Decathlon 2011. The main cost-effective and energy saving components were discovered by researching final competition scoring of each specific contest. Heat pump water heaters, properly sized photovoltaic arrays, and HVAC systems with proper dehumidification were the main findings of this research, fortunately, all of these findings can immediately be implemented into the design of net-zero energy housing with off-the-shelf products

Performance Characteristics of Putative Tests for Subclinical Chorioamnionitis

Objective: To evaluate amniotic fluid glucose, matrix metalloproteinase (MMP)-9, interleukin (IL)-6, and IL-12 for diagnosing subclinical chorioamnionitis in women with preterm labor. Methods: Forty-four women in preterm labor at 22–35 weeks gestation with suspected subclinical chorioamnionitis underwentamniocentesis.Amniotic fluid analysis included Gram stain, culture, and determination of glucose, MMP-9, IL-6, and IL-12 concentrations. Median values of these analytes were compared using the Mann-Whitney U test. Sensitivity, specificity, and positive and negative predictive values were calculated for tests using a positive amniotic fluid culture or delivery within 24 hours as the key outcome variables Results: Amniotic fluid concentrations of glucose, MMP-9, and IL-6 correlated closely with positive culture or delivery within 24 hours. IL-12 concentrations did not correlate with either a positive culture or delivery within 24 hours. Conclusions: Amniotic fluid glucose, MMP-9, and IL-6 reliably predict microbial invasion of the amniotic cavity or imminent delivery. IL-12 values did not correlate with amniotic fluid culture results or imminent delivery

PulsarX: a new pulsar searching package -I. A high performance folding program for pulsar surveys

Pulsar surveys with modern radio telescopes are becoming increasingly computationally demanding. This is particularly true for wide field-of-view pulsar surveys with radio interferometers, and those conducted in real or quasi-real time. These demands result in data analysis bottlenecks that can limit the parameter space covered by the surveys and diminish their scientific return. In this paper, we address the computational challenge of `candidate folding' in pulsar searching, presenting a novel, efficient approach designed to optimise the simultaneous folding of large numbers of pulsar candidates. We provide a complete folding pipeline appropriate for large-scale pulsar surveys including radio frequency interference (RFI) mitigation, dedispersion, folding and parameter optimization. By leveraging the Fast Discrete Dispersion Measure Transform (FDMT) algorithm proposed by Zackay et al. (2017), we have developed an optimized, and cache-friendly implementation that we term the pruned FDMT (pFDMT). The pFDMT approach efficiently reuses intermediate processing results and prunes the unused computation paths, resulting in a significant reduction in arithmetic operations. In addition, we propose a novel folding algorithm based on the Tikhonov-regularised least squares method (TLSM) that can improve the time resolution of the pulsar profile. We present the performance of its real-world application as an integral part of two major pulsar search projects conducted with the MeerKAT telescope: the MPIfR-MeerKAT Galactic Plane Survey (MMGPS) and the Transients and Pulsars with MeerKAT (TRAPUM) project. In our processing, for approximately 500 candidates, the theoretical number of dedispersion operations can be reduced by a factor of around 50 when compared to brute-force dedispersion, which scales with the number of candidates.Comment: Accepted for publication in A&

Cyclical behaviour and disc truncation in the Be/X-ray binary A0535+26

A0535+26 is shown to display quantised IR excess flux states, which are interpreted as the first observational verification of the resonant truncation scheme proposed by Okazaki and Negueruela (2001) for BeXRBs. The simultaneity of X-ray activity with transitions between these states strongly suggests a broad mechanism for outbursts, in which material lost from the disc during the reduction of truncation radius is accreted by the NS. Furthermore changes between states are shown to be governed by a 1500 day period, probably due to precession of the Be disc, which profoundly dictates the global behaviour of the system. Such a framework appears to be applicable to BeXRBs in general.Comment: 10 pages, 11 figs, submitted to MNRA

Meek Mill’s Trauma: Brutal Policing as an Adverse Childhood Experience

Meek Mill’s life and career have been punctuated by trauma, from his childhood lived on the streets of Philadelphia, through his rise to fame and eventual arrival as one of hip hop’s household names. his 2018 track Trauma, Meek Mill describes, in revealing prose, just how the traumatic experiences he endured personally impacted and harmed him. He also embodies a role as narrator in describing the same traumas and harms that impact the daily lives of countless similarly situated young Black people in the United States. As a child, Mill’s lived experience was one of pervasive poverty and fear, as the world surrounding him consisted of large-scale poverty, addiction, crime, violence, and death. As a young man—at just 19 years of age—he was beaten by police, wrongfully arrested and incarcerated, and ultimately convicted of crimes that he did not commit, becoming another statistic as a young Black man swallowed by the American criminal justice system. Meek’s story, lyrics and contributions to hip hop illuminate the Black experience with law enforcement. His personal involvements provide a powerful narrative for exactly how a racially biased criminal justice system perpetrates a trauma that extends far greater than the law has traditionally recognized. This article highlights this narrative through the lens that Meek Mill provides because of his current prominence in hip hop and the importance of his narrative claims. Despite his success in achieving the status of a true hip hop icon, Meek Mill suffered the kind of childhood adversity and trauma that emerging health care research indicates leads to debilitating health outcomes in adulthood. Powerful health studies conducted over the past two decades have uncovered the startling impact of Adverse Childhood Experiences (“ACEs”). ACEs are traumatic events that occur in childhood, ranging from abuse and neglect to other traumatic experiences derived from household and community dysfunction. Today, ACEs are generally placed by health researchers into seven to ten categories of childhood adversities ranging from sexual, physical and emotional abuse to the incarceration of a family member, living with someone who abuses alcohol or drugs and poverty, community violence and homelessness. These identified categories of trauma, although not fully understood or grasped as late as the 1990s, were known to occur in the lives of children all over the United States; however, the overall impact of childhood trauma on an individual’s long term health outcomes was only first measured in the now famous CDC-Kaiser Permanente ACE study. The findings of this study shook the health care world, forever altering the understanding of the link between childhood trauma and adult health outcomes. These links pushed researchers to look more deeply into the ultimate impact of traumatic childhood experiences on overall adult health. The groundbreaking study concluded that the more trauma a child experiences, the fewer years that child would live as an adult. In fact, in a 2009 study, CDC researchers determined that exposure to childhood trauma literally shortens an individual’s lifespan. On average, a person with six or more ACEs died twenty years earlier than a person that had experienced no Adverse Childhood Experiences. This reality, that traumatic childhood experiences are directly and inextricably linked to negative health outcomes, is now widely recognized in the public health and clinical literature. Dr. Robert Block, former President of the American Academy of Pediatrics, has warned that “[a]dverse childhood experiences are the single greatest unaddressed public health threat facing our nation today.” More recently, this literature has begun to explore the connection between trauma and race, outlining how structural violence and historical trauma—particularly violence and discrimination experienced by Black, indigenous, and persons of color—is often experienced both at the individual and community levels. Such work has focused on improving economic opportunities for trauma- stricken communities, improving the physical/built environment, and supporting the development of healthy social-cultural environments. The prevailing framework for addressing the ACEs crisis has been a medical model focused on interventions for individual survivors and communities rather than addressing the glaring systemic issues that directly contribute to the vast majority of the trauma suffered by those communities and the individuals and families that inhabit them. Largely and undeniably absent from the body of work on childhood trauma, and the proposed solutions to confronting and rectifying its deadly impact, is the exploration of how the American legal and justice systems, from municipal law enforcement to the appellate courts, stands at the epicenter of the current crisis. Each of the recognized categories of ACEs listed in medical screening instruments used by physicians to identity trauma have a direct nexus to the justice system. If we as a society are committed to treating ACEs as the public health crisis that they are, it is incumbent upon us to examine where and how our legal system is complicit in perpetuating trauma upon minority children. In addition, we need to consider how it can intervene—both at the individual and structural levels—to eliminate practices that contribute to multi-generational cycles of trauma and work to equip those with justice-system involvement to succeed and build the resilience necessary to heal minority individuals and communities who have been stricken by trauma and its life-long negative consequences. Indeed it is the responsibility of our justice system, as a major contributor to so-called “social determinants of health.” Meek Mill, in his intimate autobiographical tracks of Trauma, Oodles O’Noodles Babies, and Otherside of America, describes experiencing not just several instances of childhood trauma as identified by the CDC-Kaiser Permanente study, but as a teenager, he suffered additional cruel trauma at the hands of U.S. police and a criminal justice system that wrongly imprisoned and unfairly positioned him in a revolving door between probation and prison. The data tells us that the trauma Meek experienced as a child and teenager statistically predicts a poorer life expectancy for him than those individuals that experienced no trauma or little trauma as a child and youth. Because of the anti-Black culture of policing in America, and because of the deep systemic racism that permeates the criminal justice system, simple exposure to U.S. policing and its courts should qualify as an Adverse Childhood Experience for Black and minority children—one that contributes to harmful adult outcomes, including a shortened life expectancy. Mill’s personal childhood trauma as described in his music carefully extrapolates the ways that American policing and the criminal justice system literally traumatized and endangered his young Black life, as it does so many Black children. This article begins in Section I by providing an in-depth examination of ACEs research, including how the groundbreaking original ACE study discovered the direct link between high ACE scores and poor health outcomes and the prevalence of ACEs in the Black community. It then turns, in Section II, to a brief discussion of the broad ACE category of social disadvantage, and how a child growing up in an environment built on a foundation of poverty and violence will inevitably have more trauma, more ACEs, and be harmed through his or her experience of toxic stress. Section III will provide an overview of anti-Black policing and how law enforcement, as currently constituted, traumatizes minority communities and youth. Section IV explains how criminal charging, jailing, and sentencing traditions have disproportionately targeted Black men, contributing to the trauma that their children and families experience with the loss of a loved one to death or incarceration. The article next argues that minority youth exposure to U.S. law enforcement agents and the justice system at large functions as an ACE for youth of color in a way that is simply not present for non-minority youth and, as such, should be added to the list of ACEs that are formally recognized by public health officials. Finally, the article concludes with how Meek Mill himself is seeking to reform a system rife with debilitating trauma. Throughout each section, Meek Mill, and the raw lyrics from some of his most personal tracks, will serve as an illustration, and example, of how social disadvantage, police misconduct and brutality, and the American criminal justice system at large, cause harmful and lifelong trauma for Black Americans