THE ECONOMIC CONTRIBUTION OF AGRICULTURE IN DELAWARE: REPLY

Agribusiness,

Observations Outside the Light-Cone: Algorithms for Non-Equilibrium and Thermal States

We apply algorithms based on Lieb-Robinson bounds to simulate time-dependent and thermal quantities in quantum systems. For time-dependent systems, we modify a previous mapping to quantum circuits to significantly reduce the computer resources required. This modification is based on a principle of "observing" the system outside the light-cone. We apply this method to study spin relaxation in systems started out of equilibrium with initial conditions that give rise to very rapid entanglement growth. We also show that it is possible to approximate time evolution under a local Hamiltonian by a quantum circuit whose light-cone naturally matches the Lieb-Robinson velocity. Asymptotically, these modified methods allow a doubling of the system size that one can obtain compared to direct simulation. We then consider a different problem of thermal properties of disordered spin chains and use quantum belief propagation to average over different configurations. We test this algorithm on one dimensional systems with mixed ferromagnetic and anti-ferromagnetic bonds, where we can compare to quantum Monte Carlo, and then we apply it to the study of disordered, frustrated spin systems.Comment: 19 pages, 12 figure

Spin-Orbit Scattering and Time-Reversal Symmetry: Detection of a Spin by Tunneling

We consider the possibility of detecting spin precession in a magnetic field by nonequilibrium transport processes. We find that time reversal symmetry imposes strong constraints on the problem. Suppose the tunneling occurs directly between systems at two different chemical potentials, rather than sequentially via a third system at an intermediate chemical potential. Then, unless the magnetic fields are extremely strong or spin polarized electrons are used, the periodic signal in the current results from beating together two different precession frequencies, so that observing a signal near the Larmor frequency in this case requires having some cluster with a $g$ factor close to zero.Comment: 4 pages, 1 figur

A Multi-System Approach to Help Prevent Teen Suicide in the Upper Valley: A Focus on the LGBTQ Community

LGBTQ adolescents are at much greater risk of committing suicide as compared to their straight and cisgender peers. This project focused on connecting various community organizations working on teen suicide and compiling a list of resources so that primary care providers might play a more pivotal role in providing mental health support to the Upper Valley’s LGBTQ teens.https://scholarworks.uvm.edu/fmclerk/1204/thumbnail.jp

Positive Handling of the Negative X-Ray

Defense counsel usually pounce on negative x-rays, i.e., ones which show little or no change from before to after the accident. They triumphantly parade admissions from medical witnesses that the x-rays in the case are totally negative, before a jury which is enormously impressed through abysmal ignorance of what x-rays can and do show. Thus, the problem facing counsel for the injured party is how most persuasively to acquaint the jury with means of properly evaluating x-rays in view of their significant attributes and their deficiencies. Plaintiff\u27s counsel must somehow explain the purpose of x-rays, augment their limited information, and/or present in a different manner maladies or structures which are invisible on x-rays

THE ECONOMIC CONTRIBUTION OF AGRICULTURE IN DELAWARE

The decreasing share of production agriculture in the U.S. economy in general and Delaware in particular has raised questions about the amount of government resources being spent on the local agricultural sector. A basic question in the debate is: "What is the real economic contribution of agriculture?" This study looks at the economic role of agriculture in Delaware, presenting different perspectives of what agriculture is and what it contributes to the state economy. Based on three definitions of agriculture, the economic impacts as measured by shares to total employment, output, and value added were estimated using IMPLAN, an input-output modeling software. In each economic impact measure, the share of the local agricultural sector to the total Delaware economy ranged from around 2% to 6% in 1991.Agribusiness,

The construct of maternal positivity in mothers of children with intellectual disability

BACKGROUND: Despite the elevated levels of stress, anxiety and depression reported by mothers of children with intellectual disabilities (ID), these mothers also experience positive well‐being and describe positive perceptions of their child. To date, maternal positivity has been operationalised in different ways by using a variety of measures. In the present study, we tested whether a latent construct of maternal positivity could be derived from different measures of positivity. METHOD: One hundred and thirty‐five mothers of 89 boys and 46 girls with ID between 3 and 18 years of age completed measures on parental self‐efficacy, their satisfaction with life, family satisfaction, their positive affect and their positive perceptions of their child with ID. We conducted a confirmatory factor analysis of latent positivity and subsequently tested its association with child social skills and behaviour problems, and maternal mental health. RESULTS: A latent maternal positivity factor achieved a statistically good fit by using the five observed indicators of positivity. Parental self‐efficacy had the strongest loading on the latent factor. Maternal positivity was significantly negatively associated with maternal psychological distress, maternal stress and child problem behaviours and positively associated with child positive social behaviour. CONCLUSIONS: These findings lend support to the importance of examining parental positivity in families raising a child with ID, and using multiple indicators of positivity. Associations with negative psychological outcomes suggest that interventions focused on increasing parental positivity may have beneficial effects for parents. Further research is needed, especially in relation to such interventions

Psychological well-being of fathers with and without a child with intellectual disability: a population-based study

BACKGROUND: Few studies have explored the well-being of fathers of children with intellectual disability (ID), despite the significant role that they play in their children's lives. The current study compared fathers of children with and without a child with ID on measures of psychological well-being (life satisfaction, work-family balance and general health) and dimensions of parenting (parenting self-efficacy and parent-child closeness) and then examined whether the presence of a child with ID in the family was a significant predictor of paternal well-being when controlling for a number of father (age, education, employment and residency), child (ID status, gender, behavioural and emotional problems) and family (income poverty and number of children in the household) variables. METHODS: Data were drawn from the third wave of the Millennium Cohort Study, a UK population-representative and cohort study, where the cohort child was 5 years of age; 256 fathers were identified as having a child with ID, with data available for 10 187 fathers without a child with ID. Fathers were compared on the four well-being and parenting outcomes and then multiple regression models were conducted to explore associations between these outcomes and variables identified as potential correlates of well-being. RESULTS: Initial group comparisons showed that there were differences in the well-being of fathers, with fathers of children with ID reporting poorer life satisfaction and general health. However, these differences were small. Regression analyses showed that child behavioural and emotional problems, living in income poverty and paternal employment were more important than disability status in predicting fathers' well-being. CONCLUSIONS: These works add to the limited amount of research on fathers using population-representative data. The current findings are consistent with rejecting a general simplistic and negative narrative that raising a child with ID puts fathers at risk of poorer outcomes. However, some fathers, such as those with children with behavioural problems and living in poverty, may require greater support. Future longitudinal research that explores the impact of paternal well-being on the long-term outcomes of children with and without ID is warranted

Algebraic vortex liquid theory of a quantum antiferromagnet on the kagome lattice

There is growing evidence from both experiment and numerical studies that low half-odd integer quantum spins on a kagome lattice with predominant antiferromagnetic near neighbor interactions do not order magnetically or break lattice symmetries even at temperatures much lower than the exchange interaction strength. Moreover, there appear to be a plethora of low energy excitations, predominantly singlets but also spin carrying, which suggest that the putative underlying quantum spin liquid is a gapless ``critical spin liquid'' rather than a gapped spin liquid with topological order. Here, we develop an effective field theory approach for the spin-1/2 Heisenberg model with easy-plane anisotropy on the kagome lattice. By employing a vortex duality transformation, followed by a fermionization and flux-smearing, we obtain access to a gapless yet stable critical spin liquid phase, which is described by (2+1)-dimensional quantum electrodynamics (QED$_3$) with an emergent $\mathrm{SU}(8)$ flavor symmetry. The specific heat, thermal conductivity, and dynamical structure factor are extracted from the effective field theory, and contrasted with other theoretical approaches to the kagome antiferromagnet.Comment: 14 pages, 8 figure