GPDs and DVCS with Positrons

The beam charge asymmetry helps to isolate the real part of the deeply virtual Compton scattering (DVCS) amplitude. It is discussed what information can be gained both from the real and imaginary part of the DVCS amplitude.Comment: 5 pages, 2 figures, invited talk at `Workshop on Positrons at Jefferson Lab

New measurement of charge asymmetry xF3x{F}_3 from HERA

After presenting the recent measurements of neutral current cross section in DIS at HERA, we explain the effect of the $\gamma-Z_0$ interference at the electro-weak scale, visible on these data. Then, the beam charge difference $x{F}_3$ is measured and the interference itself is extracted. Results are discussed in the context of perturbative QCD.Comment: 4 pages, 3 figures, proceedings of the International Workshop on Positrons at Jefferson Lab (March 25-27, 2009), Thomas Jefferson National Accelerator Facility, Newport News, V

Productive pedagogies in expressive arts lessons in Malawi

AbstractThe national government in Malawi implemented a new Curriculum: the PrimaryCurriculum and Assessment Reform in 2007. The purpose of this study was to investigatethe enactment of one of the Learning areas, Expressive Arts in three urban and three ruralschools in Zomba district where teachers were first trained to teach Expressive Arts. Thestudy is framed by the Productive Pedagogies framework (Lingard, Hayes, Ladwig, Mills,Bahr et al., 2001). Following a qualitative research design, data were collected throughobservation and post-observation interviews. Data analysis showed limited productivepedagogies in most lessons. The majority of lessons were predominantly characterised bylower intellectual quality, a focus on instrumental knowledge, integration at a superficiallevel, dominance of communalising and gendered practices rather than ‘engagement withdifference’, prevalence of localising discourses ‘rather than connectedness to the world’ anda pedagogy aimed at national examinations. It appears that dominant pedagogic practices inthe Expressive Arts classroom serve to position learners in parochial orientations andissues. There was an obvious disjuncture between the intended curriculum and enactedcurriculum.The overall findings is that the enacted curriculum gave students limited opportunities forthe acquisition of knowledge and development of skills, values and attitudes required forthem to actively participate in the changing Malawian context and to be able to competesuccessfully in other contexts

Curriculum Change and Development in Malawi: A Historical Overview

To improve the quality of primary education in Malawi, the national government embarked on curriculum reform in 2001 and adopted an Outcomes Based curriculum in 2007. The new curriculum differs radically from its predecessors. This paper employs a historical approach to explore pre-colonial, colonial and post-colonial curriculum change and development in Malawi. The origin and attributes of the present OBE curriculum is emphasized and an attempt is made to explain the forces and imperatives that shaped it. This conceptual paper focuses on the process and rationale that resulted in the decision to revive the primary curriculum in 2001 to come up with an outcomes-based curriculum, and the influence of the first post-apartheid South African curriculum (C2005, 1998) on the design features of the new curriculum in Malawi. It is based on primary sources such as curriculum documents and secondary sources on curriculum development in Malawi. The paper raises concerns relating to ‘unproblematic burrowing’ of curriculum policies from South Africa, given the review and revision of C2005 in South Africa in 2000. DOI: 10.5901/mjss.2014.v5n16p33

Two-photon exchange measurements with positrons and electrons

Two-photon exchange contributions have potentially broad ranging impact on several charged lepton scattering measurements. Previously believed to be extremely small, based in part on comparisons of positron scattering and electron scattering in the 1950s and 1960s, recent data suggest that the corrections may be larger than expected, in particular in kinematic regions that were inaccessible in these early positron scattering measurements. Additional measurements using positron beams at Jefferson Lab would allow for a detailed investigation of these contributions in a range of reactions and observables.Comment: 6 pages, proceedings from the International Workshop on Positrons at Jefferson Lab (JPOS09), Jefferson Lab, Newport News, VA, March 25-27, 200

Feasibility and tolerability of whole-body, low-intensity vibration and its effects on muscle function and bone in patients with dystrophinopathies: a pilot study.

IntroductionDystrophinopathies are X-linked muscle degenerative disorders that result in progressive muscle weakness complicated by bone loss. This study's goal was to evaluate feasibility and tolerability of whole-body, low-intensity vibration (WBLIV) and its potential effects on muscle and bone in patients with Duchenne or Becker muscular dystrophy.MethodsThis 12-month pilot study included 5 patients (age 5.9-21.7 years) who used a low-intensity Marodyne LivMD plate vibrating at 30-90 Hz for 10 min/day for the first 6 months. Timed motor function tests, myometry, and peripheral quantitative computed tomography were performed at baseline and at 6 and 12 months.ResultsMotor function and lower extremity muscle strength remained either unchanged or improved during the intervention phase, followed by deterioration after WBLIV discontinuation. Indices of bone density and geometry remained stable in the tibia.ConclusionsWBLIV was well tolerated and appeared to have a stabilizing effect on lower extremity muscle function and bone measures. Muscle Nerve 55: 875-883, 2017

Spin-to-Orbital Angular Momentum Conversion and Spin-Polarization Filtering in Electron Beams

We propose the design of a space-variant Wien filter for electron beams that induces a spin half-turn and converts the corresponding spin angular momentum variation into orbital angular momentum of the beam itself by exploiting a geometrical phase arising in the spin manipulation. When applied to a spatially coherent input spin-polarized electron beam, such a device can generate an electron vortex beam, carrying orbital angular momentum. When applied to an unpolarized input beam, the proposed device, in combination with a suitable diffraction element, can act as a very effective spin-polarization filter. The same approach can also be applied to neutron or atom beams.Comment: 9 pages, 5 figure

U.S. Government Raises the Bar on Deemed Exports and Continues Other Trade Restrictions

Este proyecto de investigación contiene un diseño de un proceso de Gestión de Seguridad y Salud Ocupacional basado en la ISO 45001, propuesto para las MYPES productoras de palta Hass, con el objetivo de disminuir los riesgos presentes en sus actividades, lo cual es un problema relevante debido a los accidentes y enfermedades comunes que presentan. El primer capítulo está compuesto por un estado del arte en base a artículos científicos que se encuentran en un periodo de 5 años antes, además, cuenta con un marco teórico con temas relacionados a las MYPES en el Perú, asociatividad, gestión por procesos, productividad, y seguridad y salud ocupacional. En el segundo capítulo, se efectúa un diagnóstico de la situación actual de las MYPES productoras de palta hass, en donde se identificaron distintos problemas que originan una baja productividad en la producción de la palta hass. En el tercer capítulo, se plantea un diseño de un sistema de gestión de seguridad y salud ocupacional basada en la gestión por procesos, con la finalidad de fomentar una cultura de preventiva, la cual reduce los riesgos y mejora la productividad en el sector agrícola de palta Hass. En el capítulo cuatro, se presenta la validación tanto de los expertos como de los agricultores, con la finalidad de obtener recomendaciones y poder mejorar el diseño del proceso que se propone. Por último, en el capítulo 5 se presenta las conclusiones, recomendaciones y las futuras líneas de investigación acerca del modelo propuesto.This research project contains a design of an Occupational Health and Safety Management process based on ISO 45001, proposed for the MYPES producing Hass avocado, with the objective of reducing the risks present in their activities, which is a relevant problem due to the accidents and common diseases they present. The first chapter is composed of a state of the art based on scientific articles that are found in a period of 5 years before, in addition, it has a theoretical framework with issues related to MYPES in Peru, associativity, process management, productivity , and occupational health and safety. In the second chapter, a diagnosis is made of the current situation of the MYPES producing hass avocado, where different problems were identified that cause low productivity in the production of hass avocado. In the third chapter, a design of an occupational health and safety management system based on process management is proposed, in order to foster a culture of prevention, which reduces risks and improves productivity in the agricultural sector of Hass avocado. In the fourth chapter, the validation of both experts and farmers is presented, in order to obtain recommendations and to improve the design of the proposed process. Finally, chapter 5 presents the conclusions, recommendations and future lines of research on the proposed model.Tesi