Graphical representation of the partition function for a 1-D delta-function Bose gas

One-dimensional repulsive delta-function bose system is studied. By only using the Bethe ansatz equation, n-particle partition functions are exactly calculated. From this expression for the n-particle partition function, the n-particle cluster integral is derived. The results completely agree with those of the thermal Bethe ansatz (TBA). This directly proves the validity of the TBA. The theory of partitions and graphs is used to simplify the discussion.Comment: 15 page

Local correlations in a strongly interacting 1D Bose gas

We develop an analytical method for calculating local correlations in strongly interacting 1D Bose gases, based on the exactly solvable Lieb-Liniger model. The results are obtained at zero and finite temperatures. They describe the interaction-induced reduction of local many-body correlation functions and can be used for achieving and identifying the strong-coupling Tonks-Girardeau regime in experiments with cold Bose gases in the 1D regime.Comment: 8 pages, REVTeX4, published in the New Journal of Physic

The Influence of Overbuilt Versus Game-Permitted American Football Facemasks on Peripheral Visuomotor Ability in NCAA Division I Football Athletes

Topics in Exercise Science and Kinesiology Volume 2: Issue 1, Article 9, 2021. Heavier facemask reinforcement has been shown to impair reaction time. While overbuilt facemasks are illegal for gameplay at all levels of competition, empirical rationale for this has not be realized and it is unknown if overbuilt facemasks are worse for peripheral vision than permitted ones. Thus, the purpose of this study was to investigate the effects of wearing an overbuilt facemask versus game permitted facemasks on peripheral visuomotor ability in collegiate football players. Male NCAA Division I football players (n=18) completed a 60-second peripheral visuomotor test on a Dynavision D2 visuomotor board under the following conditions: 1) Baseline (No helmet), 2) Helmet + Light reinforced facemask, 3) Helmet + Medium reinforced facemask, 4) Helmet + Heavy reinforced facemask, 5) Helmet + Overbuilt facemask. Overall peripheral reaction time (PRT) and PRT separated by rings and quadrants were analyzed. Points of application: 1) Regardless of facemask reinforcement, wearing protective headgear impairs peripheral reaction time (PRT) compared to baseline with no helmet. Addition of an overbuilt facemask significantly impairs PRT compared to NCAA permitted facemasks. 2) An overbuilt facemask exhibits the most visuomotor decrement in far peripheral visual fields. 3) Decreases in visuomotor ability while wearing an overbuilt facemask are most pronounced in lower regions of visual field

Priorities for a global cassava research program to improve food security and incomes in developing countries: A survey of experts.

The resources available for implementing the CGIAR Research Program Roots, Tubers, and Bananas (CRP-RTB) are limited and have an opportunity cost in terms of foregone alternatives.There are many alternative research options that can be pursued to improve food security and incomes for resource-poor farmers in developing countries. This raises the need to identify how to best invest limited resources in order to generate the greatest impacts per dollar invested. The CRPRTB proposes a six stage process for setting priorities. As an initial step in this process, this study describes the perceptions of cassava research priorities by cassava researchers, development and extension specialists. These experts were asked to rank three top constraints on cassava production, transformation and commercialization and to rate the importance of 13 kinds of research options to reduce poverty and improve food security. The ranking was based on a five-point scale, between 5 as the most important and 1 as the least important research option. Results presented reflect perceptions of critical priorities for cassava research based on tallying of the response and provide the basis for further priority setting in the CRP-RTB

Universal correlations of trapped one-dimensional impenetrable bosons

We calculate the asymptotic behaviour of the one body density matrix of one-dimensional impenetrable bosons in finite size geometries. Our approach is based on a modification of the Replica Method from the theory of disordered systems. We obtain explicit expressions for oscillating terms, similar to fermionic Friedel oscillations. These terms are universal and originate from the strong short-range correlations between bosons in one dimension.Comment: 18 pages, 3 figures. Published versio

The quantum non-linear Schrodinger model with point-like defect

We establish a family of point-like impurities which preserve the quantum integrability of the non-linear Schrodinger model in 1+1 space-time dimensions. We briefly describe the construction of the exact second quantized solution of this model in terms of an appropriate reflection-transmission algebra. The basic physical properties of the solution, including the space-time symmetry of the bulk scattering matrix, are also discussed.Comment: Comments on the integrability and the impurity free limit adde

The long-term mental health impact of peacekeeping: prevalence and predictors of psychiatric disorder

BACKGROUND The mental health outcomes of military personnel deployed on peacekeeping missions have been relatively neglected in the military mental health literature. AIMS To assess the mental health impacts of peacekeeping deployments. METHOD In total, 1025 Australian peacekeepers were assessed for current and lifetime psychiatric diagnoses, service history and exposure to potentially traumatic events (PTEs). A matched Australian community sample was used as a comparator. Univariate and regression analyses were conducted to explore predictors of psychiatric diagnosis. RESULTS Peacekeepers had significantly higher 12-month prevalence of post-traumatic stress disorder (16.8%), major depressive episode (7%), generalised anxiety disorder (4.7%), alcohol misuse (12%), alcohol dependence (11.3%) and suicidal ideation (10.7%) when compared with the civilian comparator. The presence of these psychiatric disorders was most strongly and consistently associated with exposure to PTEs. CONCLUSIONS Veteran peacekeepers had significant levels of psychiatric morbidity. Their needs, alongside those of combat veterans, should be recognised within military mental health initiatives. DECLARATION OF INTEREST None.David Forbes, Meaghan O’Donnell, Rachel M. Brand, Sam Korn, Mark Creamer, Alexander C. McFarlane, Malcolm R. Sim, Andrew B. Forbes, Graeme Hawthorn

Treating adults with acute stress disorder and post-traumatic stress disorder in general practice: a clinical update

The document attached has been archived with permission from the editor of the Medical Journal of Australia. An external link to the publisher’s copy is included.General practitioners have an important role to play in helping patients after exposure to severe psychological trauma. In the immediate aftermath of trauma, GPs should offer "psychological first aid", which includes monitoring of the patient's mental state, providing general emotional support and information, and encouraging the active use of social support networks, and self-care strategies. Drug treatments should be avoided as a preventive intervention after traumatic exposure; they may be used cautiously in cases of extreme distress that persists. Adults with acute stress disorder (ASD) and post-traumatic stress disorder (PTSD) should be provided with trauma-focused cognitive behaviour therapy (CBT). Eye movement desensitisation and reprocessing (EMDR) in addition to in-vivo exposure (confronting avoided situations, people or places in a graded and systematic manner) may also be provided for PTSD. Drug treatments should not normally replace trauma-focused psychological therapy as a first-line treatment for adults with PTSD. If medication is considered for treating PTSD in adults, selective serotonin reuptake inhibitor antidepressants are the first choice. Other new generation antidepressants and older tricyclic antidepressants should be considered as second-line pharmacological options. Monoamine oxidase inhibitors may be considered by mental health specialists for use in people with treatment-resistant symptoms.David Forbes, Mark C Creamer, Andrea J Phelps, Anne-Laure Couineau, John A Cooper, Richard A Bryant, Alexander C McFarlane, Grant J Devilly, Lynda R Matthews and Beverley Raphae