Evaluating socio-economic and environmental sustainability of the sheep farming activity in Greece: a whole-farm mathematical programming approach

Ruminant livestock farming is an important agricultural activity, mainly located in less favoured areas. Furthermore, ruminants have been identi fi ed as a signi fi cant source of GHG emissions. In this study, a whole-farm optimization model is used to assess the socio-economic and environmental performance of the dairy sheep farming activity in Greece. The analysis is undertaken in two sheep farms that represent the extensive and the semi-intensive farming systems. Gross margin and labour are regarded as socio-economic indicators and GHG emissions as environmental indicators. The issue of the marginal abatement cost is also addressed. The results indicate that the semi-intensive system yields a higher gross margin/ewe (179 €) than the extensive system (117 €) and requires less labour. The extensive system causes higher emissions/kg of milk than the semi-intensive system (5.45 and 2.99 kg of CO2 equivalents, respectively). In both production systems, abatement is achieved primarily via reduction of the fl ock size and switch to cash crops. However, the marginal abatement cost is much higher in the case of the semi-intensive farms, due to their high productivity

Making Classical Ground State Spin Computing Fault-Tolerant

We examine a model of classical deterministic computing in which the ground state of the classical system is a spatial history of the computation. This model is relevant to quantum dot cellular automata as well as to recent universal adiabatic quantum computing constructions. In its most primitive form, systems constructed in this model cannot compute in an error free manner when working at non-zero temperature. However, by exploiting a mapping between the partition function for this model and probabilistic classical circuits we are able to show that it is possible to make this model effectively error free. We achieve this by using techniques in fault-tolerant classical computing and the result is that the system can compute effectively error free if the temperature is below a critical temperature. We further link this model to computational complexity and show that a certain problem concerning finite temperature classical spin systems is complete for the complexity class Merlin-Arthur. This provides an interesting connection between the physical behavior of certain many-body spin systems and computational complexity.Comment: 24 pages, 1 figur

Beef production from feedstuffs conserved using new technologies to reduce negative environmental impacts

End of project reportMost (ca. 86%) Irish farms make some silage. Besides directly providing feed for livestock, the provision of grass silage within integrated grassland systems makes an important positive contribution to effective grazing management and improved forage utilisation by grazing animals, and to effective feed budgeting by farmers. It can also contribute to maintaining the content of desirable species in pastures, and to livestock not succumbing to parasites at sensitive times of the year. Furthermore, the optimal recycling of nutrients collected from housed livestock can often be best achieved by spreading the manures on the land used for producing the conserved feed. On most Irish farms, grass silage will remain the main conserved forage for feeding to livestock during winter for the foreseeable future. However, on some farms high yields of whole-crop (i.e. grain + straw) cereals such as wheat, barley and triticale, and of forage maize, will be an alternative option provided that losses during harvesting, storage and feedout are minimised and that input costs are restrained. These alternative forages have the potential to reliably support high levels of animal performance while avoiding the production of effluent. Their production and use however will need to advantageously integrate into ruminant production systems. A range of technologies can be employed for crop production and conservation, and for beef production, and the optimal options need to be identified. Beef cattle being finished indoors are offered concentrate feedstuffs at rates that range from modest inputs through to ad libitum access. Such concentrates frequently contain high levels of cereals such as barley or wheat. These cereals are generally between 14% to 18% moisture content and tend to be rolled shortly before being included in coarse rations or are more finely processed prior to pelleting. Farmers thinking of using ‘high-moisture grain’ techniques for preserving and processing cereal grains destined for feeding to beef cattle need to know how the yield, conservation efficiency and feeding value of such grains compares with grains conserved using more conventional techniques. European Union policy strongly encourages a sustainable and multifunctional agriculture. Therefore, in addition to providing European consumers with quality food produced within approved systems, agriculture must also contribute positively to the conservation of natural resources and the upkeep of the rural landscape. Plastics are widely used in agriculture and their post-use fate on farms must not harm the environment - they must be managed to support the enduring sustainability of farming systems. There is an absence of information on the efficacy of some new options for covering and sealing silage with plastic sheeting and tyres, and an absence of an inventory of the use, re-use and post-use fate of plastic film on farms. Irish cattle farmers operate a large number of beef production systems, half of which use dairy bred calves. In the current, continuously changing production and market conditions, new beef systems must be considered. A computer package is required that will allow the rapid, repeatable simulation and assessment of alternate beef production systems using appropriate, standardised procedures. There is thus a need to construct, evaluate and utilise computer models of components of beef production systems and to develop mathematical relationships to link system components into a network that would support their integration into an optimal system model. This will provide a framework to integrate physical and financial on-farm conditions with models for estimating feed supply and animal growth patterns. Cash flow and profit/loss results will be developed. This will help identify optimal systems, indicate the cause of failure of imperfect systems and identify areas where applied research data are currently lacking, or more basic research is required

MAPIR: An Airborne Polarmetric Imaging Radiometer in Support of Hydrologic Satellite Observations

In this age of dwindling water resources and increasing demands, accurate estimation of water balance components at every scale is more critical to end users than ever before. Several near-term Earth science satellite missions are aimed at global hydrologic observations. The Marshall Airborne Polarimetric Imaging Radiometer (MAPIR) is a dual beam, dual angle polarimetric, scanning L band passive microwave radiometer system developed by the Observing Microwave Emissions for Geophysical Applications (OMEGA) team at MSFC to support algorithm development and validation efforts in support of these missions. MAPIR observes naturally-emitted radiation from the ground primarily for remote sensing of land surface brightness temperature from which we can retrieve soil moisture and possibly surface or water temperature and ocean salinity. MAPIR has achieved Technical Readiness Level 6 with flight heritage on two very different aircraft, the NASA P-3B, and a Piper Navajo

Physician Satisfaction and Physician Well-Being: Should Anyone Care?

We present a model of hypothesized relationships between physician satisfaction, physician well-being and the quality of care, in addition to a review of relevant literature. The model suggests that physicians who are stressed, burned out, depressed, and/or have poor self-care are more likely to be dissatisfied, and vice-versa. Both poor physician well-being and physician dissatisfaction are hypothesized to lead to diminished physician concentration, effort, empathy, and professionalism. This results in misdiagnoses and other medical errors, a higher rate of inappropriate referrals and prescriptions, lower patient satisfaction and adherence to physician recommendations, and worse physician performance in areas not observed by others. Research to date largely supports the model, but high quality studies are few. Research should include studies that are prospective, larger, and have a stronger analytic design, ideally including difference in differences analyses comparing quality of care for patients of physicians who become dissatisfied to those who remain satisfied, and vice versa. Keywords: physician satisfaction, physician dissatisfaction, quality of care, physician well-being, physician burnout &nbsp

Physician Dissatisfaction in the United States: An Examination

This paper addresses several root causes of dissatisfaction with medical practice among American physicians, and suggests that some, but not all, are potentially remediable. Fixed assumptions about the nature of medical practice in the United States, developed over several decades, appear to be eroding. At the same time, increasing demands on physician time, especially involving low value documentation and administrative tasks are interfering with the physician-patient interaction. In addition, physician practice structure and payment methodologies are beginning to change in the United States leading to a sense of practice instability among physicians. Recent research conducted by the American Medical Association and the RAND Corporation has provided new qualitative and quantitative information about the impact of these trends on physician practices. An evaluation of these research findings indicates that some improvements in physician satisfaction are possible.    Keywords: physician professionalism, practice satisfaction, electronic health records, health care reform in the U.S

Resources Technology and Environment in Agricultural Development

IIASA's Food and Agriculture Program is undertaking research on a complex set of issues grouped under the title: "Limits and Consequences of Food Production Technologies". The fundamental question addressed in this research is "what long-term technical development paths are feasible and likely for increasing food production, based on the present availability of resources (including energy), the long-run feedback on the environment, and the short-run pressures reflected in current agricultural policies". The objective of the research on this set of issues is to construct a model, or family of models, which will increase understanding of the resources-technology-environment (R-T-E) system in agricultural production, thus providing guidance to policies to make the system more serviceable in meeting rising world demands for food. As indicated in the quoted statement, the focus is on the behavior of the R-T-E system over the long-term. It is not necessary for our purposes to define the long-term precisely, but we think of it as a period of 2 to 3 decades. The aim of this paper is to provide an intellectual background that will be useful to the modeling effort. To this end the paper seeks to identify the principal elements in the R-T-E system, to describe the relationships among these elements, and to analyze the forces which move and modify the system through time. Throughout the analysis major emphasis is given to the role of relative prices of agricultural resources as signals to farmers of relative resource scarcity. This reflects the author's orientation and training, but it means that the analysis is not directly applicable to centrally planned economies. Farmers in those economies will feel many of the same sorts of resource pressures as farmers in market economies -- for example, the increasing cost of energy -- but the indication of those pressures and the modes of response to them are different. This limitation of the analysis should be kept in mind

Beef production from feedstuffs conserved using new technologies to reduce negative environmental impacts

End of Project ReportThe three separate components with parallel objectives to this programme were to: 1. Develop technologies for conserving and optimally feeding alternative/complimentary feedstuffs to grass silage. 2. Quantify the use and re-use of plastic sheeting or film used to seal ensiled feedstuffs or mulch maize, and evaluate some new options. 3. Develop computer programs that will facilitate investigating prototype models of forage-based beef production systems

The traditional, the ideal and the unexplored: sport coaches’ social identity constructs in film

The sport coaching construct within mainstream fiction films has been described as stereotypical, reinforcing the traditional notion of the sport coach as a technician who conquers all, or a hapless individual, open to ridicule from athletes and fans. Although this depiction is also prevalent in some independent fiction films and documentaries, film sub genres such as social realism and “fly on the wall” style documentaries move away from the “Hollywood sports film structure” towards stories that focus on everyday coaching moments. Through a critical discourse analysis of two U.K. films (Bend it Like Beckham and Twenty Four Seven), both featuring sport coaches in central roles, we reflect critically on these mass media multidimensional representations in terms of the sport coaching professionalisation agenda in the U.K. and the social identification process of sport coaches within their sporting environments. Keywords: Sport coaching, film, social identification, professionalisation, coaching roles