Cont-Bouchaud percolation model including Tobin tax

The Tobin tax is an often discussed method to tame speculation and get a source of income. The discussion is especially heated when the financial markets are in crisis. In this article we refer to foreign exchange markets. The Tobin tax should be a small international tax affecting all currency transactions and thus consequently reducing the destabilizing speculations. In this way this tax should take over a control function. By including Tobin tax in the microscopic model of Cont and Bouchaud one finds that Tobin tax could be the right method to control foreign exchange operations and get a good source of incomeComment: Expanded for of paper to be published in Int. J. Mod. Phys. C 13 (2002

Economic under-determination: industrial competitiveness and free allowances in the European carbon market

Tackling climate change has provided a key focus for the creation of what the editors of this special issue have termed ‘environmental intangibles.’ This paper focuses on the European Union Emissions Trading System (EUETS), a climate policy that revolves around the issuance and trading of environmental intangibles called emissions allowances. Set up in the mid-2000s, the cap and trade system has experienced many complications. We propose here to explore a particularly contentious issue: the allocation of free allowances. We will see that deciding on allocation rules leads to vivid debates about whether energy-intensive industries in Europe, such as the manufacturing of cement, can remain competitive in the global economy if climate policy is unilaterally enforced. These debates are focused on a phenomenon referred to as the risk of carbon leakage due to loss of competitiveness. Drawing on an empirical enquiry into the workings of policy-making, the paper examines the ways, in which this risk is framed and questioned through lobbying and evidential work. We suggest that the threat to competitiveness posed by the EUETS can neither be established, nor dismissed; a form of under-determination is maintained and carbon leakage as a never-quite-tangible possibility becomes a battleground for protecting European industry over the environment

On scale work: evidential practices and global health interventions

Scalability can be understood as the ability to expand without changing. Yet, expanding an intervention to a global scale, we suggest, is a significant and difficult accomplishment. In this paper we propose to explore the kind of evidential exigencies that this accomplishment involves. To do so, we focus on the field of global health and examine how child immunization against the pneumococcus bacterium has been scaled up in low-income countries. The paper first attends to initial epidemiological scrutiny that revealed the existence of a large-scale public health problem and the possibility of an expandable solution (vaccination). It then describes the set-up of a funding arrangement using overseas aid to purchase vaccine doses manufactured by pharmaceutical companies, before paying attention to various frictions that affect the widespread use of pneumococcal vaccines. In these different moments through which scalability is accomplished, always partially and temporarily, we show that a dual activity can be witnessed, a pivoting between referential work and forward projection. To conclude, we suggest that scalability is more usefully approached as a form of expansion that is always attentive to the possibilities of change

On the difficulties of addressing collective concerns through markets: from market devices to accountability devices

In recent years market-based interventions have been positioned as the basis for addressing what the editors of this special issue have termed ‘collective concerns’ in fields as diverse as healthcare, the environment and crime. This paper considers the terms of such interventions and the market-like relations these terms pre-suppose. It does so through a comparison of two interventions: a market-based scheme to address concerns regarding electronic waste and a Social Impact Bond for children at-risk of going into care. Ideas from Science and Technology Studies are drawn on to explore the composition of market-based interventions, the terms established through accountability devices which decide on who and what gets to participate, and the consequences that follow

Seasonal variation of arsenic concentrations in tubewells in west Bengal, India.

This study was conducted to monitor the changes in arsenic concentration during different seasons in a one-year period during 2002-2003 in selected tubewells in an arsenic-affected area in the district of South 24 Parganas in West Bengal, India, and to map the location of the wells. Seasonal variations in concentrations of arsenic in water were measured from 74 selected tubewells, ranging in depth from 40 to 500 feet. Water samples were collected from these wells during winter, summer, monsoon, and the following winter in 2002-2003. A global positioning system was used for locating the tubewells, and a geographic information system was used for mapping. There was evidence of seasonal variation in concentrations of arsenic in water (p=0.02) with the minimum average concentration occurring in the summer season (694 microg/L) and the maximum in the monsoon season (906 microg/L). From the winter of 2002 to the winter of 2003, arsenic concentrations increased, irrespective of the depth of the tubewells, from an average of 464 microg/L to 820 microg/L (p<0.001). This extent of variation in arsenic concentration, if confirmed, has important implications for both epidemiological research and mitigation programmes

Damage function for historic paper. Part I: Fitness for use

Background In heritage science literature and in preventive conservation practice, damage functions are used to model material behaviour and specifically damage (unacceptable change), as a result of the presence of a stressor over time. For such functions to be of use in the context of collection management, it is important to define a range of parameters, such as who the stakeholders are (e.g. the public, curators, researchers), the mode of use (e.g. display, storage, manual handling), the long-term planning horizon (i.e. when in the future it is deemed acceptable for an item to become damaged or unfit for use), and what the threshold of damage is, i.e. extent of physical change assessed as damage. Results In this paper, we explore the threshold of fitness for use for archival and library paper documents used for display or reading in the context of access in reading rooms by the general public. Change is considered in the context of discolouration and mechanical deterioration such as tears and missing pieces: forms of physical deterioration that accumulate with time in libraries and archives. We also explore whether the threshold fitness for use is defined differently for objects perceived to be of different value, and for different modes of use. The data were collected in a series of fitness-for-use workshops carried out with readers/visitors in heritage institutions using principles of Design of Experiments. Conclusions The results show that when no particular value is pre-assigned to an archival or library document, missing pieces influenced readers/visitors’ subjective judgements of fitness-for-use to a greater extent than did discolouration and tears (which had little or no influence). This finding was most apparent in the display context in comparison to the reading room context. The finding also best applied when readers/visitors were not given a value scenario (in comparison to when they were asked to think about the document having personal or historic value). It can be estimated that, in general, items become unfit when text is evidently missing. However, if the visitor/reader is prompted to think of a document in terms of its historic value, then change in a document has little impact on fitness for use