bluuebunny/crossref_metadata_2025_split huggingface dataset:
Geostatistics in fisheries survey design and stock assessment: models, variances and applications
Authors: Petitgas Pierre 
Published: March 2003

AbstractOver the past 10 years, fisheries scientists gradually adopted geostatistical tools when analysing fish stock survey data for estimating population abundance. First, the relation between model‐based variance estimates and covariance structure enabled estimation of survey precision for non‐random survey designs. The possibility of using spatial covariance for optimising sampling strategy has been a second motive for using geostatistics. Kriging also offers the advantage of weighting data values, which is useful when sample points are clustered. This paper discusses, with fisheries applications, the different geostatistical models that characterise spatial variation, and their variance formulae for many different survey designs. Some anticipated developments of geostatistics related to multivariate structures, temporal variability and adaptive sampling are discussed.
Visualisation of standardized life‐history patterns
Authors: Zeller Dirk , Pauly Daniel 
Published: March 2003

AbstractThe life‐history patterns of fish and invertebrate species are complex. But much of this complexity can be captured in simple diagrams of coastal transects, where juveniles usually occur in larger numbers in shallow waters, while adults generally inhabit deeper, offshore waters. Iconographic representations of generalized life‐history patterns and depth profiles, with specific key life‐history parameters can capture much of these standardized patterns, including spawning areas, nursery/juvenile distributions, adult distributions and spawning migrations. Several examples presented here from a wide range of habitats and ecosystems (temperate and tropical waters, demersal, deep water, pelagic and coral reefs), including an example of different stocks of the same species, illustrate some general patterns with regard to water depth and distance from shore. The present approach should be viewed as a first step towards obtaining standardized patterns about key life‐history parameters, and will hopefully lead to incorporation into management of life‐history interconnectivity between different fishery sectors or gears. This may contribute to sustainable, ecosystem‐based approaches to management by informing policy options when faced with decisions to rationalize overcapitalized fisheries.
Electromyographic evaluation of cervical dystonia for planning of botulinum toxin therapy
Authors: Dressler D. 
Published: March 2003

The success of botulinum toxin (BT) injections for treatment of cervical dystonia depends on precise identification of dystonic muscles and on quantification of their dystonic involvement. Conventionally, this is attempted by clinical examination analysing the dystonic head position. In this presentation, a more systematic approach is sought by using an electromyography (EMG)‐based evaluation procedure.In 10 consecutive patients with cervical dystonia not previously exposed to BT clinical examination, analysing the dystonic head position was performed to classify patients into four groups with similar dystonic head positions. Additionally, a 2‐channel concentric needle EMG was used to measure the amplitudes of dystonic and maximal voluntary activities in sternocleidomastoid (SCM), splenius capitis (SC) and trapezius/semispinalis capitis (T/SS) muscles bilaterally. The ratio between both amplitudes, the dystonia ratio, was used to quantify dystonic muscle involvement.In all patients dystonia ratios could be calculated. In patients with similar head positions, EMG evaluation revealed different qualitative and quantitative dystonic involvement patterns. In six patients, there were discrepancies in identification of dystonic muscles between clinical examination and EMG evaluation. EMG evaluation excluded dystonic involvement in five patients. All excluded muscles were SCM. In one of these patients, additional T/SS involvement was detected by EMG evaluation. In one patient, SC involvement was revealed by EMG evaluation. All dystonic muscle involvement detected by EMG evaluation represented genuine dystonic muscle coactivation rather than compensatory muscle activity.The EMG evaluation presented allows quantitative and qualitative identification of dystonic muscle involvement which cannot be achieved by clinical examination. Both pieces of information may be helpful for optimization of BT therapy.
Women superintendents: the contribution of Margaret MacDowall and other women managers of mental deficiency institutions in England
Authors: Stevens Andy R. A. 
Published: March 2003

SummaryThe present paper explores gender differences in the management of mental deficiency institutions. It suggests that women played a particularly significant part in the management of some of the earliest institutions, and had a significant influence from the nineteenth century until well into the twentieth century. In addition, this study addresses the particular contribution of Miss S. Margaret MacDowall (1862–1930). Miss MacDowall's work demonstrates that teaching regimes and conditions in some types of smaller institutions run by women compare favourably to larger institutions run by men. The present paper further suggests that small institutions run by women during the Mental Deficiency Acts are worthy of more detailed study because these provide a continuity between nineteenth‐century pedagogic traditions and modern forms of community‐based residential care, and can offer useful ideas for developing residential care in the future.
Helping adults with a learning disability keep safe in the local community: report of a group design, development and evaluation
Authors: Long Karen , Holmes Nan 
Published: March 2003

SummaryThe present paper describes the design, delivery and evaluation of a Keeping Safe Group for adults with a learning disability. The group was designed to provide participants with information on keeping safe in the local community by avoiding potentially dangerous situations. The effectiveness of the group structure and format was evaluated during three pilot Keeping Safe Groups using an 18‐item test of knowledge administered before and after group attendance, and at follow‐up 4–6 months later. The results indicate that the Keeping Safe Group sessions provided an effective method for teaching participants the knowledge necessary to ensure that they kept themselves as safe as possible in the local community. The knowledge gained was maintained 4–6 months after the group finished. There were no gender variations or differences in the amount of knowledge learned during the three separate groups. Possible directions for future research are highlighted.
Achieving best evidence from witnesses with learning disabilities: new guidance
Authors: Cooke Pamela , Davies Graham 
Published: March 2003

SummaryThe new legislation contained within the UK Youth Justice and Criminal Evidence Act 1999, which comes into force in 2001, offers ‘special measures’ to enable vulnerable witnesses to give improved evidence in court. The present paper examines these measures and considers the guidelines which have been prepared to implement the legislation. The Guidance, currently contained within a Home Office Consultation Paper, Achieving Best Evidence in Criminal Proceedings: Guidance for Vulnerable or Intimidated Witnesses, including Children, emphasizes the need for early identification of witnesses with learning disabilities, and offers suggestions regarding identification and the type of support which should be offered in terms of attitude, conditions, practice and language.
Difference and choice: exploring prenatal testing and the use of genetic information with people with learning difficulties
Authors: Ward Linda , Howarth Joyce , Rodgers Jackie 
Published: March 2003

SummaryDevelopments in genetics have huge implications for disabled people (including people with learning difficulties) and their families. On the positive side, there is the potential for greater understanding of – and ultimately, perhaps, treatments for – serious conditions like cystic fibrosis and sickle cell anaemia, but there are also concerns about the negative implications, including the potential for discrimination in insurance, employment and even life itself. Yet, the voices of those most affected by these developments – people with learning difficulties and their families, and disabled people generally – have been conspicuously absent from these debates. The present article describes two workshops that explained the use of prenatal testing and genetic information to inform choices in pregnancy to people with learning difficulties, and then explored the issues with them and the contribution subsequently made by these people to a national conference on this subject. Methods for explaining the complex issues involved in an accessible way and exploring them in a supportive environment are described along with the views of people with learning difficulties on these issues.
‘I might not know what you know but it doesn’t mean you can be awful to me'
Authors: Johnson Alex , Mason Heidi , Withers Paul 
Published: March 2003

SummaryThe case highlights the importance of providing a safe environment for individuals with learning disabilities to talk about their experiences and, particularly, their perspective on living with their learning disabilities. In particular, the case examines the experiences of a young lady who engaged in therapy, employing cognitive behavioural principles, in an attempt to address her negative self‐evaluation and understanding of the terms, learning disability and mental handicap.
Hydrothermal fluid flow models of stratiform ore genesis in the McArthur Basin, Northern Territory, Australia
Authors: Garven G. , Bull S. W. , Large R. R. 
Published: March 2003

AbstractThis paper explores the role of basin‐scale fluid migration in stratiform Pb–Zn ore formation in the southern McArthur Basin, Australia. Mathematical models are presented for coupled brine migration and heat transport in the basin. The models account for: (i) topographically driven flow (forced convection) during periods when parts of the McArthur Basin were subaerial and elevated above the central Batten Fault Zone; (ii) density‐driven flow (free convection) during periods when the basin was mostly submarine; and (iii) transient flows associated with fault rupture during periods of transpression. These hydrologic models help to compare and contrast a variety of hypotheses concerning deep fluid migration and the origin of base metal ores in the McArthur Basin. The numerical results exhibit a strong structural control on fluid flow caused by the north‐trending fault systems that characterize the Batten Fault Zone. As a result, fluids descend to depths of a few kilometers along the western side, migrate laterally to the east through the clastic and volcanic aquifers of the upper Tawallah and lowest McArthur Groups, and then ascend along the eastern side of the fault zone. This recharge–discharge pattern dominates all of the hydrogeologic models. The basin‐wide flow pattern suggests that Na–Ca–Cl brines acquired base metals in the deepest levels of the basin stratigraphy as the fluids migrated eastwards through the aquifer system. Upward flow was relatively rapid along the Emu Fault Zone, so much so that fluid temperatures likely approached 130°C in the muddy sediments near the sea floor due to upward flow and venting at the HYC (‘Here’s Your Chance'). Transient pulses of flow characterized periods of transpressional stress and subsequent faulting may have punctuated the basin history. Large‐scale free convection, however, characterized notably long periods of diagenesis and ore mineralization during the Proterozoic in the McArthur Basin.
Transfer of hydrocarbons from natural seeps to the water column and atmosphere
Authors: MacDonald I. R. , Leifer I. , Sassen R. , Stine P. , Mitchell R. , Guinasso N. 
Published: March 2003

AbstractResults from surface geochemical prospecting, seismic exploration and satellite remote sensing have documented oil and gas seeps in marine basins around the world. Seeps are a dynamic component of the carbon cycle and can be important indicators for economically significant hydrocarbon deposits. The northern Gulf of Mexico contains hundreds of active seeps that can be studied experimentally with the use of submarines and Remotely Operated Vehicles (ROV). Hydrocarbon flux through surface sediments profoundly alters benthic ecology and seafloor geology at seeps. In water depths of 500–2000 m, rapid gas flux results in shallow, metastable deposits of gas hydrate, which reduce sediment porosity and affect seepage rates. This paper details the processes that occur during the final, brief transition — as oil and gas escape from the seafloor, rise through the water and dissolve, are consumed by microbial processes, or disperse into the atmosphere. The geology of the upper sediment column determines whether discharge is rapid and episodic, as occurs in mud volcanoes, or more gradual and steady, as occurs where the seep orifice is plugged with gas hydrate. In both cases, seep oil and gas appear to rise through the water in close proximity instead of separating. Chemical alteration of the oil is relatively minor during transit through the water column, but once at the sea surface its more volatile components rapidly evaporate. Gas bubbles rapidly dissolve as they rise, although observations suggest that oil coatings on the bubbles inhibit dissolution. At the sea surface, the floating oil forms slicks, detectable by remote sensing, whose origins are laterally within ∼1000 m of the seafloor vent. This contradicts the much larger distance predicted if oil drops rise through a 500 m water column at an expected rate of ∼0.01 m s−1 while subjected to lateral currents of ∼0.2 m s−1 or greater. It indicates that oil rises with the gas bubbles at speeds of ∼0.15 m s−1 all the way to the surface.
Geochemistry of the Bagnères‐de‐Bigorre thermal waters from the North Pyrenean Zone (France)
Authors: Levet S. , Toutain J. P. , Munoz M. , Berger G. , Negrel P. , Jendrzejewski N. , Agrinier P. , Sortino F. 
Published: March 2003

AbstractThermal springs are poorly known in the sedimentary sites of the Pyrenees. In this paper, we describe the ‘Bagnères‐de‐Bigorre’ springs which occur in a remarkably active seismotectonic context. A chemical and isotopic study of 15 spring waters (both cold and thermal, ranging in temperature from 7.0 to 49.9°C), and continuous monitoring of a single spring allow us to characterise water–rock interactions, fluids paths and mixing processes.Three groups of waters are distinguished: (I) SO42+–Ca2+–Cl– thermal waters (II) SO42+–Cl––Ca2+ thermal waters and (III) HCO3––Ca2+ cold shallow waters. Their characteristics suggest interactions with Mesozoic evaporite and carbonate formations. O and D isotopes from thermal waters indicate a local meteoric origin of Atlantic signature and a recharge elevation of 800 to 1000 m, which corresponds to a single feeding area. Their δ13C values (−2.8 to −9.6‰) are consistent with carbonate dissolution, slight fractionation and a surficial organic input leading to δ13C depletion. Sr isotopes (0.70751 to 0.70777), Na+/Cl– and (Ca2+ + Mg2+)/SO42– ratios as well as thermodynamic calculations show that the dissolution of anhydrite and halite‐bearing Triassic layers control the chemical composition of group‐I and ‐II waters.The contrasting trends of cation/Cl– ratios and TDS of waters from groups I and II suggest the existence of two different circulation paths at depth as well as dilution with surficial waters similar to group III. Calculated mixing proportions show that three waters from group I are diluted from 17 to 66%, whereas all waters from group II are mixed.The aquifer temperature is estimated to be in the range 55–64°C using the retrograde and prograde solubilities of anhydrite and chalcedony, respectively. Accordingly, the mean depth of the reservoir is around 1.7 km, which allows us to constrain the depth of the Triassic layer.
Gas breakthrough experiments on fine‐grained sedimentary rocks
Authors: Hildenbrand A. , Schlömer S. , Krooss B. M. 
Published: March 2003

AbstractThe capillary sealing efficiency of fine‐grained sedimentary rocks has been investigated by gas breakthrough experiments on fully water saturated claystones and siltstones (Boom Clay from Belgium, Opalinus Clay from Switzerland and Tertiary mudstone from offshore Norway) of different lithological compositions. Sand contents of the samples were consistently below 12%, major clay minerals were illite and smectite. Porosities determined by mercury injection lay between 10 and 30% while specific surface areas determined by nitrogen adsorption (BET method) ranged from 20 to 48 m2 g − 1. Total organic carbon contents were below 2%.Prior to the gas breakthrough experiments the absolute (single phase) permeability (kabs) of the samples was determined by steady state flow tests with water or NaCl brine. The kabs values ranged between 3 and 550 nDarcy (3 × 10−21 and 5.5 × 10−19 m2). The maximum effective permeability to the gas‐phase (keff) measured after gas breakthrough on initially water‐saturated samples extended from 0.01 nDarcy (1 × 10−23 m2) up to 1100 nDarcy (1.1 × 10−18 m2). The residual differential pressures after re‐imbibition of the water phase, referred to as the ‘minimum capillary displacement pressures’ (Pd), ranged from 0.06 to 6.7 MPa. During the re‐imbibition process the effective permeability to the gas phase decreases with decreasing differential pressure. The recorded permeability/pressure data were used to derive the pore size distribution (mostly between 8 and 60 nm) and the transport porosity of the conducting pore system (10‐5–10‐2%).Correlations could be established between (i) absolute permeability coefficients and the maximum effective permeability coefficients and (ii) effective or absolute permeability coefficients and capillary sealing efficiency. No correlation was found between the capillary displacement pressures determined from gas breakthrough experiments and those derived theoretically by mercury injection.
The origins of salinity in metamorphic fluids
Authors: Yardley B. W. D. , Graham J. T. 
Published: March 2003

AbstractEvaluation of data on formation waters and metamorphic fluids sampled by drilling or preserved in fluid inclusions reveals little correlation between fluid salinity and metamorphic grade, but a strong link to original sedimentary setting. Sediments and metasediments deposited originally in shallow marine environments can contain fluids with a very wide range of salinities, but they are commonly near twice seawater salinity or higher. With increasing metamorphic grade, a very wide range of salinities may develop, with the highest levels tracking halite saturation. Oceanic and accretionary prism sequences yield low‐salinity fluids, close to seawater values, almost irrespective of metamorphic grade until extreme conditions are reached where removal of water may increase fluid salinity. The salinities of metamorphic fluids exert a fundamental control on both fluid phase equilibria and metal‐transporting capability, and appear, to a large degree, to reflect the original presence or absence of highly saline formation waters and/or evaporites in the initial sedimentary sequence.
Re‐equilibration of fluid inclusions in diagenetic‐anchizonal rocks of the Ciñera‐Matallana coal basin (NW Spain)
Authors: Ayllón F. , Bakker R. J. , Warr L. N. 
Published: March 2003

AbstractThermally re‐equilibrated fluid inclusions are reported in natural fissure quartz (qtz1) from polymineralic veins in the diagenetic‐anchizonal clastic sedimentary rocks of the Ciñera‐Matallana coal basin (Variscan, NW Spain). Euhedral quartz formed during early fissure opening from an immiscible fluid mixture composed of a low salinity aqueous solution and a CH4‐rich vapour phase, at temperatures of about 110–120°C and pressures ranging from 15 to 56 MPa. Five textural types of re‐equilibration are recognised in progressive order of inclusion modification: scalloped, hairy, annular‐ring shaped, haloes and decrepitation clusters. These textures resulted from a combination of brittle fracturing and dissolution and re‐precipitation of quartz, with preferential loss of water. The thermal peak was short‐lived, but was high enough to induce extensive decrepitation of fluid inclusions in vein quartz throughout the entire basin. Enhanced temperatures can be related to the intrusion of diorites in the basin. Careful analysis of textural features in fluid inclusions from diagenetic and very low‐grade metamorphism environments constitutes a useful tool for recording basin thermal history.
The origin of deep subsurface microbial communities in the Witwatersrand Basin, South Africa as deduced from apatite fission track analyses
Authors: Omar G. I. , Onstott T. C. , Hoek J. 
Published: March 2003

AbstractThe first fission track analyses of detrital apatite grains from the subsurface of the Kaapvaal Craton were utilized to delineate the thermal history for the northern margin of the Witwatersrand Basin, South Africa, where evidence for subsurface thermophilic and hyperthermophilic microorganisms have been discovered. Fission track apatite ages for core samples ranged from 21 to 422 Ma. The trend of decreasing age with increasing depth parallels a trend previously reported for fission track data from surface samples collected from the higher altitude centre and lower altitude margins of the Kaapvaal Craton, South Africa. These new fission track ages are older than the surface samples of equivalent elevation, indicating that the uplift history and/or the geothermal gradient of the centre of the Kaapvaal Craton is distinct from that of its margins. Modelling of one sample collected from a depth of 3.7 km records cooling from 120°C at 75 Ma at a rate of approximately 1.4°C m.y.−1 and reaching present day temperatures at 30 Ma. This modelling result when compared to other apatite fission track dates indicate that this cooling trend followed a 90‐Ma thermotectonic event. The fission track data also indicate that heated fluid migration, which is observed today in this region of the Witwatersrand Basin, was also active in the past in order to explain the greater palaeogeothermal gradient (18 versus 8°C km−1). The fission track results suggest that at approximately 70 Ma only hyperthermophilic microorganisms could have existed at palaeodepths >3.2 km depth in the Witwatersrand Basin, and that the current meso/thermophilic microbial communities living at or beneath the present depth of 1.7 km in the Witwatersrand Basin must have migrated to their current location since 70 Ma. Any hyperthermophilic microorganisms found at the present depths 1.2–3.7 km could be descendents of subsurface hyperthermophiles that colonized the crust since the early Mesozoic to Palaeozoic eras.
The nutritional content of male prisoners' diet in the UK
Authors: Edwards John S. A. , Edwards Audrey , Reeve William G. 
Published: March 2003

AbstractThe Prison Catering Service has changed from a Ration Scale to a pre‐select menu system as the basis for providing prisoners' meals. The purpose of this research was to ascertain how this may have affected male prisoners' nutritional intake. Using a modified visual estimation technique, the dietary intake of 506 prisoners (mean age 35 years, height 1.77 m and weight 78.03 kg) in eight prisons was estimated for a 24‐h period. Results show that overall, the mean nutrient intake from food provided by HM Prisons (2561 kcal; 10.77 MJ) fell within current recommendations. However, in four prisons, energy intake was below the recommendations as were a small number of micronutrients (vitamin A, vitamin B2, vitamin C and calcium, one prison each; and vitamin D, in all prisons) from the food provided. The mean percentage of energy provided from total fat (36%) was just in excess of the recommendation of 35% and similar to the National average. There is little evidence to suggest that the ‘new’ system has any detrimental effects on prisoners' nutritional intake.