The aim and goal of this work has been to design and implement a voltage reference network for a 12-bit PSAADC, Parallell Successive Analog to Digital Converter. A chip containing the design has been sent away for fabrication. Because of the long processing time, no measurement data are presented. The main specifications for the voltage reference generator is to generate stable reference voltages with low noise and a good PSRR. Efforts has also been made to minimize the power consumption..

The main purpose of this Masters thesis was to examine how the Internet and other electronic sources have affected public librarians use of printed reference sources. During the last couple of years the use of the electronic sources - in particular the Internet has become more established in the Swedish public libraries. Our aim was to examine if and how this has affected the use of the printed reference sources. This has been examined on the basis of the following factors: the gender and age of the librarians and how long they have served in the library. We also examined if the size of the library affects the use of the printed and the electronic reference sources and also which factors that are most important when librarians acquire reference sources.

The main purpose of this study was to establish to what extent undergraduate students use reference services, what knowledge they have about those services and what their views of them are.The survey took place at Lund University Library, UB1, the main library responsible for collections in social sciences, humanities, theology and law. A total of 476 undergraduate students were asked to fill in a questionnaire, 273 accepted. The study is quantitative and was carried out during the autumn semester, 1996.The results show that the service used most frequently by undergraduate students is the reference collection. The least used service is the Internet, more than 50 percent of the students never use Internet at the University Library. In general, students are very pleased with the service given by the reference librarians, and with the collection of reference books.

Active headsets have been on the market for years and now it is time for something else to enter the stage. The technology of active noise reduction can for exmple also be used in ventilation systems for reducing ventilation noise. An active control system principally consists of four important components, namely the downstream error microphone, the upstream detection or reference microphone, the digital signal processor (DSP) and a loudspeaker. The upstream reference microphone listen to the primary ventilation noise and sends it to the DSP which makes a phase shift to the signal and sends it to the loudspeaker. The loudspeaker sends out the opposite waveform of the incoming one and reduce the primary ventilation noise.

This Master's thesis aims to investigate the reference interview using the discourse analytical method discourse psychology. The reference interview has been studied thoroughly, and its importance has been proven repeatedly within the field of Library and Information Science (LIS). However, it has never been studied from a discourse analytical point of view before.The material for our study was gathered at Malmö public library, and consists of 10 tape-recorded and then transcribed reference interviews. Our study shows that there are several discourses within the reference situation. The dominating discourse, the reference interview discourse, is found within all the reference interviews.

Erythropoiesis is a complex and carefully controlled process which is mainly regulated by erythropoietin. Using flow cytometry cells in a blood sample can be analyzed one by one. ADVIA 2120 using flow cytometry for analysis of red blood cells (RBC) and reticulocytes. Red blood cell distribution width (RDW) is a component of the RBC method. RDW indicates size variation on erythrocytes and is measured as a percentage of the mean cell volume (MCV). By measuring the RDW anemia can be divided into makrocytic, microcytic or normocytic. Reticulocytes refract light more strongly than red blood cells because they contain some cellular debris. The number of reticulocytes in the peripheral blood reflects erythropoiesis in the bone marrow. The purpose of this project was that by approved methods to establish reference ranges for the parameters, RDW and reticulocyte counts.The individuals who participated in the study, n=124, were considered healthy and had varying ethnicity. Reference subjects had not donated blood the last six months and participation in the study was voluntary.The statistic evaluation includes examination of distribution, and reference ranges for both men and women were established using the 2.5:t and 97.5:t percentiles. The calculated reference interval for RDW was between 12.0 ? 14.3% and the calculated reference interval for reticulocytes was between 38.0 ? 112.8 x109 cells/L. The results showed a significant difference between males and females for the parameter reticulocytes was seen. The difference indicates that different reference ranges should be established for men and women (p<0,0001). No significant difference between males and females were seen for RDW (p=0,74) indicating that the same reference ranges can be used for both men and women. .

Neurography is the most objective and reliable measure of the peripheral nerve function, and it is used to diagnose both local and generalized neuropathies. Neurography can measure both motor and sensory nerve functions. The principle for sensory neurgraphy is to stimulate over the nerve and record proximal or distal from the stimulated electrode.At the Department of Clinical Neurophysiology, University Hospital Uppsala, a problem has been identified, in that young adult patients tend to show unexpected abnormal neurography values in relation to the expected, indicated by the reference limits, without clinical correlates. This concerns foremost the sensory amplitudes in median and ulnar nerves. The hypothesis is that the requirement of young adults? amplitudes is too high.

Active headsets have been on the market for years and now it is time for something else to enter the stage. The technology of active noise reduction can for exmple also be used in ventilation systems for reducing ventilation noise. An active control system principally consists of four important components, namely the downstream error microphone, the upstream detection or reference microphone, the digital signal processor (DSP) and a loudspeaker. The upstream reference microphone listen to the primary ventilation noise and sends it to the DSP which makes a phase shift to the signal and sends it to the loudspeaker. The loudspeaker sends out the opposite waveform of the incoming one and reduce the primary ventilation noise.

The aim of this master thesis is to find out if young people and librarians think that reference groups can support public libraries to meet the needs of young people, and if the reference groups, which the librarians describe, differentiates from the young peoples requirements. I have made a qualitative study with a questionnaire to six librarians who have experience from reference groups and ten interviews with teenagers. The result showed that young people have many interests and needs which can be met from the library. The teenagers were positive to the library and many of them showed interest in having more influence on the library. Many would like to join a reference group, but on the condition that they would be offered real influence.

The aim of this thesis was to study librarians approach upon reference questions and available resources and also to find out if there is any connection between the nature of the reference question and the choice of resource. The purpose was also to give a deeper understanding of the reference work. Nine librarians were given ten reference questions and their reference work was tape recorded. The study was completed with seven interviews sent by email. Some of the reflections were translated under the headlines of form, subject, time, language and availability.

The purpose of this master thesis is to investigate how librarians working in academic libraries are experiencing the reference situation from a pedagogical point of view, by applying a theoretical framework consisting of learning strategies and their different characteristics, to qualitative interviews. Other goals are to elucidate the fact that learning takes place every day at libraries during the reference situation and that this work must be seen as ?one of the most important activities that takes place at the library?, using the words from one of the interviewed librarians, but also to make place for more discussions regarding pedagogic and library work. This is done by posing questions about knowledge, learning, information literacy, communication, the reference encounter, the roles of the librarian, policy and also architectural aspects of the reference situation. The interviews were taped, transcribed and categorized according to the earlier mentioned areas of interest.

This master thesis is a study of a new electronic library reference service-project called Speak instantly to a librarian and the purpose of the thesis is to investigate a new electronic reference service and how the librarians who work with it experience it. This should be seen from an informational society point of view. The study is conducted from two questions: - What needs do the libraries have and how do they argue for the project and the chat-reference service Speak instantly to a librarian? - How do the librarians experience the personal work situation in the new reference service, and its use of chat technology? Together with interviews of a selected group of librarians from the public libraries of Göteborg, Malmö, Nacka and Stockholm, this thesis includes aspects such as the theory of the informational society by Manuel Castells, as well as literary studies of the history of library reference, the development of electronic reference service and the virtual library, and the background and the beginning of the studied project Speak instantly to a librarian. The thesis also contains an overlook of other similar library projects in the United States of America.

The purpose of this Master?s thesis is to investigate how librarians solve difficult reference questions. The aim is to discuss the nature of reference work ? do librarians make conscious decisions regarding search strategies or do they rely principally on their instincts, or simply chance. The thesis is a qualitative study.

The most common way to treat wastewater in Sweden today is by a combination of an activated sludge process and a chemical treatment. These processes are not very energy efficient and may not be the most environmentally friendly. That is why it is interesting to evaluate new alternative methods to see if they can be less harmful to the environment and help to a lower resource consumption. New techniques are tested in a pilot installation at Hammarby Sjöstad, Sjöstadsverket. To be able to evaluate these techniques in a wide perspective system analyses are conducted where different impacts can be considered, advantages and disadvantages in the systems.Five system structures for water treatment have been constructed in Matlab/Simulink in this study.

Catecholamines are stress hormones that are produced and released by a rare tumor called pheochromocytoma. This tumor can cause hypertension which if undiagnosed and untreated leads to death. Since good therapy is available, it is important to find the tumor in time. The most common way to diagnose the tumor is measurement of the biochemical markers; catecholamines and their metabolites, methylated catecholamines.After observation that almost all normetanephrine results for women were higher than the upper reference limit and therefore pathological, the accuracy of the present reference intervals was questioned. Therefore new reference intervals for both urinary catecholamines and methylated catecholamines were developed by analysis of 46 samples using HPLC.