Modelling the impact of policies to reduce environmental impacts in the New Zealand dairy sector

Agriculture remains a major sector of the New Zealand economy, with the vast majority of farm and food production exported. The accelerating intensification of farming in New Zealand over recent decades raises concern over the current sustainability of New Zealand farming, and whether it can remain so in the future. In this study, we focus on the impacts of policies to reduce environmental impacts of dairy farming, with a particular focus on nitrogen pollution and greenhouse gases (GHG) emissions. We use a modified version of the Global Trade Analysis Project (GTAP) model and database, with improved specification of the agricultural sector and land-use. We augment the model with environmental indicators for New Zealand, including nitrogen balances and GHG emissions. We simulate a range of scenarios involving reductions in fertiliser use and stocking rates on dairy farms, from an updated 2010 database. In particular, we consider seven scenarios, with the objective of exploring reductions in the dairy stocking rate and the application of nitrogenous fertiliser to dairy farms to target reductions in the dairy sector’s nitrogen balance of 10%, 20% and 30%. Reducing fertiliser use and stocking rates are two of the approaches that dairy farmers can take in order to reduce their emissions of nitrogen and GHGs. Our results suggest that the nitrogen balance could be reduced by 10% with a 16% cut in nitrogenous fertiliser and a 5% fall in the stocking rate. Reducing fertiliser use and stocking rate by 31% and 11% respectively could result in a 20% cut to the dairy sector’s nitrogen balance. To achieve a 30% reduction in the nitrogen balance, our results suggest that the cut back in fertiliser use would need to be 45%, with the stocking rate reduced by 19%. Across these scenarios, our results indicate that value added in the dairy farm sector could fall by between 2% and 13%, while export earnings from dairy products may fall by between US$269 million and US$1,145 million

Uncovering problematics in design education - learning and the design entity

This paper attempts to articulate some of the challenges for the curriculum, teaching methods and assessment in design education arising from research currently underway in London and Australia. Taking a phenomenographical approach, the research asks whether the experience of learning and teaching in design education, both for students and teachers, is consistent with conceptions shared, within the educational community, about the professional world of designers. We believe that there is substantial variation in the conceptions held by both students and teachers about what design is and how it should be learned. These variations in conceptions have a significant impact on how students learn and how teachers teach

Teachers' and students' conceptions of the professional world

In the original 'Improving Student Learning' project led by Prof Graham Gibbs in 1991, one of the case studies focused on approaches to learning on a BA(Hons) Graphic Information Design course. The case study, led by Allan Davies, had the modest intention of trying to determine whether a particular curriculum innovation encouraged a deep approach to learning. Our only significant tool then was Bigg's SOLO taxonomy. Eleven years later and the innovators have moved on, the course has disappeared and the research context and methodologies have developed. During this period, research has suggested that both teachers and students describe their understanding of teaching and learning according to their perception of the teaching/ learning environment (Ramsden, 1992; Prosser & Trigwell, 1999). Studies have identified variation in the way that teachers experience teaching (Samuelowicz & Bain, 1992; Prosser, Trigwell & Taylor, 1994 for example) and variation in the way teachers experience student learning (Bruce & Gerber, 1995). More recently, Reid (1997) has widened the context of research by examining the relation between the experience of work and teaching/learning within the music discipline. In further research (Reid 1999), relations were found within the music discipline where teachers' and students' experience of one of three defined dimensions was strongly related to the ways in which they understood teaching and learning music. The musicians (and their students) described their experience of the professional world in three hierarchically related ways. This constitution has become known as the 'Music' Entity. In 1999, following a fortuitous meeting at the ISL conference in York, Davies and Reid conducted a joint enquiry, using a phenomenographic approach, to determine the 'Design' entity (Davies and Reid, 2001). This research focused on discerning the critical differences, or variation, in the way teachers and students experience and understand their subject and its relation to the professional design world. The outcomes of this research has, consequently, begun to impact on student learning through course design and, in particular, assessment. This paper will be a comparative study of the research already carried out by the authors in a number of disciplines in which the same focus and methodology has been used

Reasoning By Contradiction in Dynamic Geometry

This paper addresses contributions that dynamic geometry systems (DGSs) may give in reasoning by contradiction in geometry. We present analyses of three excerpts of students’ work and use the notion of pseudo object, elaborated from previous research, to show some specificities of DGS in constructing proof by contradiction. In particular, we support the claim that a DGS can offer “guidance” in the solver’s development of an indirect argument thanks to the potential it offers of both constructing certain properties robustly, and of helping the solver perceive pseudo objects

The current round of agricultural trade negotiations: Should we bother about domestic support?

The current WTO agricultural trade negotiations began in March 2000, and became part of the Doha Round in late 2001. The previous Uruguay Round reached agreements in the areas of market access, export competition and domestic support. The current Round is seeking agreements under similar headings. Reaching agreement over reductions in domestic support to farmers is complicated by a number of factors, such as the extent to which such support impacts on production decisions, the wishes of governments to support farmers for pursuing multifunctional outcomes from agriculture, and the categorisation of a myriad of policy instruments into green, blue and amber boxes. It therefore poses the risk of considerably extending the negotiations and diverting attention away from other areas of reform. But the sustainabilility of many domestic support policies requires imposition of trade barriers so reform of trade barriers may force governments into reforming domestic support without requiring specific international agreements. Quantitative assessment, using the GTAP applied general equilibrium model is used to analyse trade reform scenarios, with and without specific changes in domestic support. It is concluded that substantial trade expansion and welfare gains can be achieved even when domestic support is excluded from the multilateral agreement, and that improved market access makes a far greater contribution to welfare gains than reforms to domestic policies. Once substantive reforms to border policies have been achieved, attention can then be turned to the lower-priority task of reforming domestic support

Durvalumab: an investigational anti-PD-L1 monoclonal antibody for the treatment of urothelial carcinoma.

Our expanding knowledge of immunotherapy for solid tumors has led to an explosion of clinical trials aimed at urothelial carcinoma. The primary strategy is centered on unleashing the immune system by releasing the inhibitory signals propagated by programmed cell death-1 (PD-1) and its ligand programmed cell death ligand-1 (PD-L1). Many antibody constructs have been developed to block these interactions and are used in clinical trials. The Food and Drug Administration has already approved a number of checkpoint inhibitors such as anti-cytotoxic T-lymphocyte-associated protein 4 (CTLA4) monoclonal antibodies including ipilimumab; anti-PD-1 monoclonal antibodies including nivolumab and pembrolizumab; anti-PD-L1 antibodies including atezolizumab, avelumab, and durvalumab. One of the latest inhibitors is durvalumab, which is a high-affinity human immunoglobulin G1 kappa monoclonal antibody and blocks the interaction of PD-L1 with PD-1 and CD80. Currently, there are a number of ongoing trials in advanced urothelial carcinoma both using durvalumab monotherapy and in combination with other targeted therapies. In addition, durvalumab is being investigated in the non-muscle-invasive urothelial carcinoma, which is centered around intravenous formulations. These exciting developments have added a significant number of therapies in a previously limited treatment landscape

Simulation of GNSS reflected signals and estimation of position accuracy in GNSS-challenged environment

Abstract The paper describes the development and testing of a simulation tool, called QualiSIM. The tool estimates GNSS-based position accuracy based on a simulation of the environment surrounding the GNSS antenna, with a special focus on city-scape environments with large amounts of signal reflections from non-line-of-sight satellites. The signal reflections are implemented using the extended geometric path length of the signal path caused by reflections from the surrounding buildings. Based on real GPS satellite positions, simulated Galileo satellite positions, models of atmospheric effect on the satellite signals, designs of representative environments e.g. urban and rural scenarios, and a method to simulate reflection of satellite signals within the environment we are able to estimate the position accuracy given several prerequisites as described in the paper. The result is a modelling of the signal path from satellite to receiver, the satellite availability, the extended pseudoranges caused by signal reflection, and an estimate of the position accuracy based on a least squares adjustment of the extended pseudoranges. The paper describes the models and algorithms used and a verification test where the results of QualiSIM are compared with results from collection of real GPS data in an environment with much signal reflection.</jats:p

Acute flaccid paralysis with anterior myelitis - California, June 2012-June 2014.

In August 2012, the California Department of Public Health (CDPH) was contacted by a San Francisco Bay area clinician who requested poliovirus testing for an unvaccinated man aged 29 years with acute flaccid paralysis (AFP) associated with anterior myelitis (i.e., evidence of inflammation of the spinal cord involving the grey matter including anterior horn cell bodies) and no history of international travel during the month before symptom onset. Within 2 weeks, CDPH had received reports of two additional cases of AFP with anterior myelitis of unknown etiology. Testing at CDPH's Viral and Rickettsial Disease Laboratory for stool, nasopharyngeal swab, and cerebrospinal fluid (CSF) did not detect the presence of an enterovirus (EV), the genus of the family Picornaviridae that includes poliovirus. Additional laboratory testing for infectious diseases conducted at the CDPH Viral and Rickettsial Disease Laboratory did not identify a causative agent to explain the observed clinical syndrome reported among the patients. To identify other cases of AFP with anterior myelitis and elucidate possible common etiologies, CDPH posted alerts in official communications for California local health departments during December 2012, July 2013, and February 2014. Reports of cases of neurologic illness received by CDPH were investigated throughout this period, and clinicians were encouraged to submit clinical samples for testing. A total of 23 cases of AFP with anterior myelitis of unknown etiology were identified. Epidemiologic and laboratory investigation did not identify poliovirus infection as a possible cause for the observed cases. No common etiology was identified to explain the reported cases, although EV-D68 was identified in upper respiratory tract specimens of two patients. EV infection, including poliovirus infection, should be considered in the differential diagnosis in cases of AFP with anterior myelitis and testing performed per CDC guidelines

Fraser of Allander Institute : Economic Commentary [June 2018]

As the financial year draws to a close, it is a good time to reflect on Scotland's economic performance over the past twelve months and perhaps more so, to consider the significant challenges that lie ahead. Little has changed since December's Fraser Economic Commentary on Scotland’s economic performance; there is growth, but the pace is slow with little expectation it will accelerate at any significant rate over the coming three years. As has been well established, increasing productivity has been, and remains, one of Scotland’s key economic challenges

Multi-Atom Quasiparticle Scattering Interference for Superconductor Energy-Gap Symmetry Determination

Complete theoretical understanding of the most complex superconductors requires a detailed knowledge of the symmetry of the superconducting energy-gap $\Delta_\mathbf{k}^\alpha$, for all momenta $\mathbf{k}$ on the Fermi surface of every band $\alpha$. While there are a variety of techniques for determining $|\Delta_\mathbf{k}^\alpha|$, no general method existed to measure the signed values of $\Delta_\mathbf{k}^\alpha$. Recently, however, a new technique based on phase-resolved visualization of superconducting quasiparticle interference (QPI) patterns centered on a single non-magnetic impurity atom, was introduced. In principle, energy-resolved and phase-resolved Fourier analysis of these images identifies wavevectors connecting all k-space regions where $\Delta_\mathbf{k}^\alpha$ has the same or opposite sign. But use of a single isolated impurity atom, from whose precise location the spatial phase of the scattering interference pattern must be measured is technically difficult. Here we introduce a generalization of this approach for use with multiple impurity atoms, and demonstrate its validity by comparing the $\Delta_\mathbf{k}^\alpha$ it generates to the $\Delta_\mathbf{k}^\alpha$ determined from single-atom scattering in FeSe where $s_{\pm}$ energy-gap symmetry is established. Finally, to exemplify utility, we use the multi-atom technique on LiFeAs and find scattering interference between the hole-like and electron-like pockets as predicted for $\Delta_\mathbf{k}^\alpha$ of opposite sign