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Articles 11761 - 11790 of 11796
Full-Text Articles in Entire DC Network
Automated Cold Vapour Flow-Injection Analysis Of Mercury At High Concentrations., W. T. Corns, L. C. Ebdon, S. J. Hill, P. B. Stockwell
Automated Cold Vapour Flow-Injection Analysis Of Mercury At High Concentrations., W. T. Corns, L. C. Ebdon, S. J. Hill, P. B. Stockwell
School of Geography, Earth and Environmental Sciences
Continuous-flow cold vapour- atomic fluorescence spectrometry is shown to be an extremely sensitive technique for the determination of mercury with detection limits typically below 0.01 mug l(-1). Linear calibration ranges were found to be at least four orders of magnitude (i.e. up to 0.1 mg l(-1)). Samples with concentrations exceeding the linear range are susceptible to self-absorption, and may, in severe cases, cause carry-over problems between samples. The flow-injection approach has been utilized to extend the upper limit of the linear calibration range allowing determinations up to 10 mg l(-1) of mercury. A range of certified reference materials and zinc …
Automated Cold Vapour Flow-Injection Analysis Of Mercury At High Concentrations, Wt Corns, Lc Ebdon, Sj Hill, Pb Stockwell
Automated Cold Vapour Flow-Injection Analysis Of Mercury At High Concentrations, Wt Corns, Lc Ebdon, Sj Hill, Pb Stockwell
School of Geography, Earth and Environmental Sciences
Continuous-flow cold vapour- atomic fluorescence spectrometry is shown to be an extremely sensitive technique for the determination of mercury with detection limits typically below 0.01 μg l-1. Linear calibration ranges were found to be at least four orders of magnitude (i.e. up to 0.1 mg l-1). Samples with concentrations exceeding the linear range are susceptible to self-absorption, and may, in severe cases, cause carry-over problems between samples. The flow-injection approach has been utilized to extend the upper limit of the linear calibration range allowing determinations up to 10 mg l-1 of mercury. A range of certified reference materials and zinc …
Erosion And Electrode Energy Distribution In Switches With Silver-Cadmium-Oxide Contacts, Hassan Nouri
Erosion And Electrode Energy Distribution In Switches With Silver-Cadmium-Oxide Contacts, Hassan Nouri
School of Engineering, Computing and Mathematics Theses
The cathode and the anode fall of the DC arcs are measured by fast oscilloscope for Ag-CdO contacts over a range of gap-lengths from 0.05 mm to 1 mm, and currents of 4-10 Amps at atmospheric pressure, with a known electrode closing speed, using the Moving Electrode Method. It was observed that the anode fall can occur in a few places within the arc voltage waveform, and is dependent of the electrodes' surface condition. Both cathode and anode falls increase with gap-length and decrease with current. It was found that when arc length is shorter than electrode separation, discontinuity within …
Aspects Of The Micropalaeontology And Stratigraphy Of Cretaceous Shelf Carbonates From The Oman Mountains, Michael Derek Simmons
Aspects Of The Micropalaeontology And Stratigraphy Of Cretaceous Shelf Carbonates From The Oman Mountains, Michael Derek Simmons
School of Geography, Earth and Environmental Sciences Theses
Five outcrop sections (Wadi Mi'aidin, Wadi Bani Kharus, Jebel Madar, Jebel Madamar and Jebel Salak), exposing Thamama and Wasia Group sediments were sedimentologically logged and sampled. Thin sections of each of the Thamama Group samples were prepared for micropalaeontological and microfacies analysis. The foraminifera, calcareous algae and calpionellids in each sample were recorded in order to provide a means of biostratigraphic subdivision, and together with microfacies analysis and sedimentological observations made in the field, provide a means of elucidating the depositional environments of the Thamama Group in the study area. Correlation between outcrop sections has been attempted using a biozonation …
The Immune Response Of The Grey Mullet, Chelon Labrosus (Risso, 1826), To Cryptocotyle Lingua (Creplin, 1825), (Digenea), Bradbury Patrick Wood
The Immune Response Of The Grey Mullet, Chelon Labrosus (Risso, 1826), To Cryptocotyle Lingua (Creplin, 1825), (Digenea), Bradbury Patrick Wood
School of Biological and Marine Sciences Theses
The ability of thick-lipped grey mullet to mount both humoral and cellular immune responses to Cryptocotyle lingua has been demonstrated here for the first time. Of the 3 procedures for immunisation investigated, namely exposure to live cercariae, intraperitoneal (ip) injection of whole killed cercariae and ip injection of a cercarial sonicate, the former gave the highest primary antibody titres with a peak response at 4 weeks post infection. Peak titres occurred at 5 and 7 weeks after immunisation by ip injection of sonicated cercariae and whole killed cercariae respectively. An enhanced secondary antibody response was observed following challenge by ip …
Lchthyophthiriasis In Fish: Genetic Variation In Resistance To Infection, Graham Maurice Clayton
Lchthyophthiriasis In Fish: Genetic Variation In Resistance To Infection, Graham Maurice Clayton
School of Biological and Marine Sciences Theses
The frequency and severity of fish diseases is; increasingly, being reported as a limiting factor in the future development of aquaculture. The control of fish disease is largely performed in retrospect through curative chemotherapy. However, the development of resistant strains of fish places the emphasis on preventative, rather than the curative, control of disease. The freshwater parasite Icthyophthirius multifiliis causes the disease known as ichthyophthiriasis or white spot. Losses of fish due to this parasite are believed to total over one million dollars per annum worldwide. The objective of this study was to examine the genetics of resistance to I. …
Learning And Instructional Success In People With A Mental Handicap, Stephen Charles Strand
Learning And Instructional Success In People With A Mental Handicap, Stephen Charles Strand
School of Psychology Theses
Learning - the process by which new skills and behaviours are acquired - is a central concept in the understanding of mental handicap. Discrimination learning Is specifically identified as an essential pre-requlslte for the acquisition of a variety of more complex behaviours and skills. Many studies have reported that severely mentally handicapped persons show a relative inability to profit from unstructured learning experiences, and frequently fail to learn discriminations trained through simple differential reinforcement (trial-and-error training). Programmed training procedures are identified as important vehicles to facilitate the discrimination learning of severely mentally handicapped children. An initial study is reported that …
The Structure And Reactivity Of Some Metallurgical Carbons, Kenneth Edwin Adams
The Structure And Reactivity Of Some Metallurgical Carbons, Kenneth Edwin Adams
School of Geography, Earth and Environmental Sciences Theses
The reactivity and micro-structure of three coals and two cokes used in iron and steel manufacture have been studied by a variety of techniques, including gas sorption analysis, thermal analysis and microscopy. Changes in surface areas and porosities of the coals and cokes during combustion have been determined by a gravimetric nitrogen sorption technique at 77K. The cokes and coals have been studied by thermal analysis under isothermal and dynamic conditions in different gas atmospheres. Rates of reaction have been correlated with surface area changes. Attempts have been made to calculate activation energies from Kissinger plots of DTA data. Microstructural …
The Marketing And Distribution System For Fresh Fish In South West England: Modelling The Effects Of Supply Variation, John Edward Slaymaker
The Marketing And Distribution System For Fresh Fish In South West England: Modelling The Effects Of Supply Variation, John Edward Slaymaker
Plymouth Business School Theses
The distribution system in the fishing industry has attracted little attention from academics in comparison to the catching sector. This realisation came in the early 1980's with questions being raised about system efficiency and the identification of problems. A lack of understanding of the distribution system led to various calls for an investigation. This research builds on existing understanding by identifying the distribution system in Devon and Cornwall and develops a modelling framework with forecasting properties within which distribution system problems can be analysed. A review of the marketing and distribution literature reveals that system efficiency and the impacts of …
Optimisation Of The Inductively-Coupled Plasma For The Analysis Of Solutions And Slurries, Philip Norman
Optimisation Of The Inductively-Coupled Plasma For The Analysis Of Solutions And Slurries, Philip Norman
School of Geography, Earth and Environmental Sciences Theses
The application of inductively-coupled plasma (ICP) spectrometry for the analysis of solutions and slurries is reviewed. The critical parameters which affect analytical performance are identified and methods for the optimisation of the ICP for such applications demonstrated. Particle size of the suspended sample is shown to be the most important factor in the analysis of slurry samples. It is demonstrated that only particles less than 8 um in diameter reach the plasma even when the maximal diameter injector tube (3 mm i.d.) is used. Accordingly various methods for the reduction of particle size have been investigated and milling shown to …
Systems Approach To Documentary Maritime Fraud, Peter Kapoor
Systems Approach To Documentary Maritime Fraud, Peter Kapoor
Other Faculty of Science and Engineering Theses
Wring the last decade documentary maritime fraud has caused considerable financial loss. The internationality of the crime and the difficulties experienced in the investigation and prosecution of offenders has caused serious concern both nationally and internationally. The aim of this research was to examine the system of international trade in terms of flow between institutions, and to develop a model of the system to identify areas of system failures in terms of actual or potential frauds. A database consisting of 101 fraud cases was compiled. Detailed examination of the cases identified features common to different classes of fraud. Systems approach …
Sailors' Wives And Husband Absence, Joan Chandler
Sailors' Wives And Husband Absence, Joan Chandler
Other Faculty of Arts, Humanities and Business Theses
This thesis reports on a study of women married to Royal Navy personnel and resident in the West of England and Wales. The analyses are based on data derived from secondary sources, a questionnaire survey and in-depth interviews, the field-work having been conducted between January 1985 and April 1986. Past research has concentrated on the emotional reaction of wives to husband absence, its relationship to anxiety and depression. This thesis is, however, concerned with the social situation of wives intermittently without husbands. It is an exploration of the marital and domestic consequences of husband absence and the implications it has …
Aspects Of Efficiency In A Small Engineering Company, Michael Miles
Aspects Of Efficiency In A Small Engineering Company, Michael Miles
School of Engineering, Computing and Mathematics Theses
This thesis sets out to identify and discuss five of the subjects that were found to have a significant bearing on the attempts of a small engineering company to improve efficiency. The subjects detailed are production control, layout, costing, decision making and cost reduction. The bulk of the observations were made during a two year period spent as a Teaching Company Associate with a company (T.J. Filters PLC.) first evaluating and then implementing the opportunities offered by factory relocation. A new manufacturing facility was designed and built with a reduction in floor space of 31%. In the first two years …
A Simple And Versatile Interface To Feed Analogue Data From The Output Of Analytical Instruments To A Bbc Microcomputer, L Ebdon, Jig Alonso, Sj Hill, A Hopkins
A Simple And Versatile Interface To Feed Analogue Data From The Output Of Analytical Instruments To A Bbc Microcomputer, L Ebdon, Jig Alonso, Sj Hill, A Hopkins
School of Geography, Earth and Environmental Sciences
An interface is described to convert analogue data from the recorder or other output of a typical analytical spectrometer, or other instrument, to an amplified form suitable for feeding to the ADC of a microcomputer (BBC B+). The interface is simple and easy to construct, avoids complicated software, and can be used for a variety of applications. Excellent linearity was observed in transformed data and the interface is particularly suited to handling transient signals. Examples of its use in atomic absorption spectrometry, solution spectrophotometry and high performance liquid chromatography are given.
A Simple And Versatile Interface To Feed Analogue Data From The Output Of Analytical Instruments To A Bbc Microcomputer., L. Ebdon, Ji Alonso, S. J. Hill, A. Hopkins
A Simple And Versatile Interface To Feed Analogue Data From The Output Of Analytical Instruments To A Bbc Microcomputer., L. Ebdon, Ji Alonso, S. J. Hill, A. Hopkins
School of Geography, Earth and Environmental Sciences
No abstract provided.
Voluntarism And The Criminal Justice System : A Comparative Analysis, Martin Laurence Gill
Voluntarism And The Criminal Justice System : A Comparative Analysis, Martin Laurence Gill
Other Faculty of Arts, Humanities and Business Theses
This thesis comparatively evaluates three groups of volunteers working within the criminal justice system in the South West of England. The groups chosen - probation Voluntary Associates, police Specials and Victims Support Scheme Volunteers - incorporate parties working with the offender, the public and the victim, ie those most closely identified with the judicial process. To date, research in both Britain and abroad has chosen to focus on a single agency which has limited our understanding of voluntarismo Nevertheless, most have identified a number of issues pertaining to the use of volunteers. Through a consideration of the type of work …
A Foraminiferal Biostratigraphy Of The Upper Cretaceous Of The Southern North Sea Basin (Uk Sector)., Kim C. Ball
A Foraminiferal Biostratigraphy Of The Upper Cretaceous Of The Southern North Sea Basin (Uk Sector)., Kim C. Ball
School of Geography, Earth and Environmental Sciences Theses
The Cenomanian to Maastrictian foraminifera have been studied from borehole material (ditchcuttings) of three wells - 44/2-1,49/19-1 and 49/20-2 - drilled by Shell (UK) Exploration & Production Ltd in the Southern North Sea Basin. The microfaunas have been utilized in the formulation of a zonal scheme comprising twelve foraminiferal biozones based on 'tops' (highest occurrences) of selected taxa; the taxonomy of the stratigraphically diagnostic forms is briefly discussed. The major lithostratigraphic units of the Dutch and British sectors of the Upper Cretaceous of the Southern North Sea Basin are recognised from Gamma Ray and Formation Density wireline log signitures (where …
Further Developments In The Taylor 'V' Type Vawt Concept., Aj Robotham, Dj Sharpe, Da Taylor, Ga Boyle
Further Developments In The Taylor 'V' Type Vawt Concept., Aj Robotham, Dj Sharpe, Da Taylor, Ga Boyle
School of Engineering, Computing and Mathematics
This paper describes the development of the Taylor 'V' Type Vertical Axis Wind Turbine (V-VAWT) which was first described at the 1983 ISES Solar Energy Congress in Perth, Australia. The aerodynamic performance prediction model VAWTTAY has been enhanced in VAWTTAY6. Further wind tunnel tests have been carried out using two-bladed models, and two of these are described. These tests have produced results which are close to the values predicted by VAWTTAY6, and results which have demonstrated that power control of the V-VAWT can be achieved by varying the pitch of the blade tips. The design of a prototype 5kW machine, …
Investigation Of Ocular Artefacts In The Human Eeg And Their Removal By A Microprocessor-Based Instrument, Emmanuel Ifeachor
Investigation Of Ocular Artefacts In The Human Eeg And Their Removal By A Microprocessor-Based Instrument, Emmanuel Ifeachor
School of Engineering, Computing and Mathematics Theses
The Electroencephalogram (EEG) is widely used in clinical and psychological situations, but it is often seriously obscured by ocular artefacts (OAs) resulting from movements in the ocular system (eyeball, eyelids etc). 'The work described in this thesis is concerned with the problems of OAs in the human EEG, their removal both off-line and on-line, and the design and development of an on-line OA removal system, together with a critical review of the literature on the subject. The work of Jervis and his co-workers was extended to further study OAs, to obtain improved measures of the effectiveness of OA removal, and …
An Investigation Of The Contingent Negative Variation Using Signal Processing Methods, Martin John Nichols
An Investigation Of The Contingent Negative Variation Using Signal Processing Methods, Martin John Nichols
School of Engineering, Computing and Mathematics Theses
The Contingent Negative Variation (CNV) is one of many types of electrical response signals which appear in the electroencephalogram (EEG) of man subsequent to one or more stimuli. Generally these responses are small in comparison to the normal background EEG and had always been thought to consist of a response component which was added to the background EEG. Professor B. McA. Sayers of Imperial College suggested that the auditory response might actually be due to a temporary ordering of the phases of the components of the background EEG. A model, allowing for additive and ordering effects, is proposed here. This …
The Interaction Between Nurses And Patients' Relatives, Ruth Hawker
The Interaction Between Nurses And Patients' Relatives, Ruth Hawker
School of Nursing and Midwifery Theses
During the course of a span of duty the nurse in hospital has to relate to a number of different people including other occupational groups, other nurses, patients and patients' relatives. The present study has been designed to examine one of these role-relationships, that between the nurse and the patients' relatives.
The History Of Libraries In Plymouth To 1914: A Study Of The Library Developments In The Three Towns Of Plymouth, Devonport And Stonehouse Which Amalgamated Into Plymouth In 1914, Margaret Ivy Lattimore
The History Of Libraries In Plymouth To 1914: A Study Of The Library Developments In The Three Towns Of Plymouth, Devonport And Stonehouse Which Amalgamated Into Plymouth In 1914, Margaret Ivy Lattimore
Other Faculty of Arts, Humanities and Business Theses
The individual and collective history and character of the Three Towns is outlined, with special reference to factors affecting their potential as library environments. The libraries are then presented by type, each type being introduced by an appropriate sketch of the national setting and specialist local background, followed by accounts of individual libraries. The libraries are mostly post-1800, and the main types are: commercial subscription, private subscription, literary and philosophical, mechanics' institutes, cooperative, rate-supported, school, scientific, medical, law and naval libraries. The general conclusions reached are: that the Three Towns contained a number of libraries which were amongst the earliest …
The Smithsons At Robin Hood, John Furse
The Smithsons At Robin Hood, John Furse
Other Faculty of Arts, Humanities and Business Theses
This thesis The Smithsons at Robin Hood can be seen as a logical continuation of This Was Tomorrow, in that it deals specifically with that tomorrow: the culmination of the Smithsons' thinking, on the problem of mass working-class housing, in the built form of Robin Hood Gardens, Poplar, London E.14., completed in 1972. It is the purpose of this thesis to argue that the Smithsons' intentions were indeed a dream, and that Robin Hood is an ideological fragment of that dream. The building is, as Johnson suggests: 'very far from being just another block of council flats', equally it is …
The Biology Of Marine Myxosporida And An Investigation Into The Effects Of These Parasites On Teleosts, Charles Nigel Tomlinson
The Biology Of Marine Myxosporida And An Investigation Into The Effects Of These Parasites On Teleosts, Charles Nigel Tomlinson
School of Geography, Earth and Environmental Sciences Theses
A survey of Myxosporidia in teleosts from the South-Western. coast of England demonstrated the widespread occurrence of these parasites. Infection in selected fish species was related to age, sex and seasonal migration of the host. Structural studies of Myxobolus exiguus and Myxidium incurvatum were undertaken in order to investigate sporogenesis, parasite development and the host-parasite interface. Of particular note was the intimate association between parasite and host cells, the structure of the surface layers in Myxobolus exiguus and Myxidium incurvatum, and the occurrence of epithelioid cells in developmental stages of Myxobolus exiguus. Myxobolus exiguus was transmitted experimentally in mullet, and …
Computer Modelling Of Marine Traffic Behaviour, Paul Vernon Davis
Computer Modelling Of Marine Traffic Behaviour, Paul Vernon Davis
School of Engineering, Computing and Mathematics Theses
The increase in marine traffic has resulted in the need for traffic routing schemes in areas of high vessel density. In order to assess the viability of a scheme before it is brought into use a simulation study can be used. This thesis describes the construction of a computer model to simulate the behaviour of mariners using the concepts of domains and arenas to control their actions. The arena is an area around a ship where one navigator takes account of another ship's presence. The domain is the area around his ship which a navigator wishes to keep clear of …
The Stimulated Ambipolar Diffusion Under High Frequency Electric Field, Gi Shapiro, Am Soroka
The Stimulated Ambipolar Diffusion Under High Frequency Electric Field, Gi Shapiro, Am Soroka
School of Biological and Marine Sciences
No abstract provided.
The Role Of Content In Reasoning, Kenneth Ian Manktelow
The Role Of Content In Reasoning, Kenneth Ian Manktelow
School of Psychology Theses
A programme of research is reported in which the effects of different contents in two deductive reasoning paradigms were investigated. A review of the literature showed that the two main determinants of performance are the logical structure of the task, and non-logical performance variables such as 'matching bias’. Matching is a prime determinant of behaviour in abstract tasks, e.g. Wason's Selection task. This is shown by systematically negating logical rule components. However, a large literature indicates that logical performance is facilitated by using thematic materials.
Human Reasoning: Logical And Nonlogical Explanations, Paul Pollard
Human Reasoning: Logical And Nonlogical Explanations, Paul Pollard
School of Psychology Theses
This thesis is concerned with subjects' responses to psychological 'reasoning’ tasks. Theoretical interpretations of responses to such tasks can be broadly categorised into logical explanations, that assume that subjects perform an analysis on the structure of the problem and nonlogical explanations, that explain responses as determined by some, logically irrelevant, feature of the problem. In part 1, data from relevant reasoning studies are reviewed with particular reference to identifying separate effects of logical and nonlogical factors. It is concluded that both factors appear to play a role in determining responses.
Ionization-Superheating Instability Of A Glow Discharge In Time-Varying Fields And Stabilizing Effect Of A Train Of High-Voltage Pulses, Gi Shapiro
School of Biological and Marine Sciences
No abstract provided.
On Stabilisation Of Adhesive Instability Of Glow Discharge By A Rotating Electric Field., Gi Shapiro
On Stabilisation Of Adhesive Instability Of Glow Discharge By A Rotating Electric Field., Gi Shapiro
School of Biological and Marine Sciences
No abstract provided.