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No description available.

Presents results of research in the field of low-level electromagnetic fields interacting with the higher organisms, in the frequency band from 0,01 to 30 Hz effect on the individual or social group. Provides a description of the methodology of measuring and evaluating the impact of workplace assembled measuring low-level electromagnetic fields, extremely low frequency (ELF) on a sample of respondents. It was proposed measuring device for monitoring and evaluating how respondents' reactions to changes in the geomagnetic or external - external magnetic / electromagnetic field and to work for the measurement and evaluation of changes in external magnetic fields very low levels (ELF). This work is designed to process and evaluate implemented within experimental research into the influence of low-level magnetic fields in the Earth's resonator psychophysiological parameters of human organism and its behavior and decision-making. The work confirmed the influence of low-level magnetic fields on the psychophysiological parameters of the organism to be simultaneously confirmed the hypothesis established in accordance with the objectives of work.

När flygfarkoster befinner sig på marken får de sin strömförsörjning tillgodosedd genom att vara anslutna mot en GPU (Ground Power Unit), vilket förser flygfarkosten med spänningen 115 V till en frekvens av 400 Hz. Dagens moderna flygfarkoster består av mer avancerad elektronik, vilket kan ge upphov till störningar på den matande GPU som tidigare inte förekommit. Syftet med denna rapport är att undersöka vilka lastfall som kan genereras av en flygfarkost, för att genom en konstruktion kunna återskapa dessa i form av en variabel last. Med hjälp av lasten ska GPU:ers förmåga att upprätthålla spänning och frekvens utvärderas, för att kontrollera om dessa vidhålls trots störningar i form av växlande belastningar. Huvudmålen för rapporten är att fastställa vilka lastfall som kan genereras och återskapa dessa genom en variabel last samt slutligen verifiera och kontrollera framtagen produkt tillsammans med en GPU. En viktig avgränsning för rapporten är att den last som konstrueras inte kommer att kunna genera övertoner, någon som vanligen förekommer bland dagens flygfarkoster. Lasten kommer därigenom enbart att kunna växla mellan att vara induktiv eller kapacitiv. Resultatet från denna rapport visar på att genom konstruktion av en last med lastfallen cos-φ 0,5 0,6 0,7 0,8 0,9 samt -0,5 -0,6 -0,7 -0,8 -0,9, går det att simulera en flygfarkost i form av induktiva och kapacitiva växlingar. Det observeras också genom mätningar att den last som konstruerats ger störningar på spänning och ström liknade det som setts vid mätningar på en verklig flygfarkost.  Slutsatsen för denna rapport är att det går att konstruera en variabel last som kan generera lastfall likt en modern flygfarkost, både teoretiskt och praktiskt. Det går också genom denna last att efterlikna verkliga störningar uppmätta på en GPU, för att därigenom kunna utvärdera dess förmåga att hantera komplexa lastfall. / When an aircraft is on the ground, it receives its power by being connected to a GPU (Ground Power Unit), which supplies the aircraft with a voltage of 115 V to a frequency of 400 Hz. Today's modern aircraft consists of more advanced electronics, which can cause interference to the GPU that not previously existed. The purpose of this report is to investigate which load cases can be generated by an aircraft, to be able to reproduce these in the form of a variable last.  Using the load, the GPU's ability to maintain voltage and frequency should be evaluated to check if these are maintained despite interference in the form of alternating loads. The objectives of this report are to determine which load cases can be generated and recreate these through the variable load, to verify and control the developed product together with a GPU. An important delimitation of the report is that the constructed load will not be able to generate harmonics, which is commonly found among today's aircraft. The load will therefore only be able to switch between being inductive or capacitive. The result of this report shows that by constructing a load with the load case cos-φ 0.5 0.6 0.7 0.8 0.9 and -0.5 -0.6 -0.7 -0, 8 -0.9, it is possible to simulate an aircraft in the form of inductive and capacitive alternations. It has also been seen by measurements that the constructed load causes disturbances in voltage and current similar to those seen in measurements on a real aircraft. This report concludes that it is possible to construct a variable load that can generate load cases similar to a modern aircraft, both theoretically and practically. It also possible to mimic real interference measured on a GPU, thereby evaluate its ability to handle complex load cases.

Objective: Restorative sleep is associated with increased autonomous parasympathetic nervous system activity that might be improved by heart rate variability-biofeedback (HRV-BF) training. Hence the aim of this study was to investigate the effect of a four-week mobile HRV-BF intervention on the sleep quality and HRV of healthy adults. - Methods: In a prospective study, 26 healthy participants (11 females; mean age: 26.04 ± 4.52 years; mean body mass index: 23.76 ± 3.91 kg/m²) performed mobile HRV-BF training with 0.1 Hz breathing over four weeks, while sleep quality, actigraphy and HRV were measured before and after the intervention. - Results: Mobile HRV-BF training with 0.1 Hz breathing improved the subjective sleep quality in healthy adults [t(24) = 4.9127, p ≤ 0.001, d = 0.99] as measured by the Pittsburgh Sleep Quality Index. In addition, mobile HRV-BF training with 0.1 Hz breathing was associated with an increase in the time and frequency domain parameters SDNN, Total Power and LF after four weeks of intervention. No effect was found on actigraphy metrics. - Conclusions: Mobile HRV-BF intervention with 0.1 Hz breathing increased the reported subjective sleep quality and may enhance the vagal activity in healthy young adults. HRV-BF training emerges as a promising tool for improving sleep quality and sleep-related symptom severity by means of normalizing an impaired autonomic imbalance during sleep.

International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California / Aerospace Report No. TOR-0059(6110-01)-3, section 1.3.3 outlines the design and performance requirements of SGLS (Space Ground Link Subsystem) services. GDP Space Systems has developed a single card slot FSK (Frequency Shift Keying)/AM (Amplitude Modulation) demodulator. An application of this service is the US Air Force Satellite Command and Ranging System. The SGLS signal is tri-tone-FSK, amplitude modulated by a modified triangle wave at half the data rate. First generation FSK/AM demodulators had poor noise performance because the signal tones were filtered and processed at IF frequencies (65, 76 and 95 kHz). Second generation demodulators suffer from "threshold" due to non-linear devices in the signal path before the primary noise filtering. The GDP Space Systems demodulator uses a 0-Hz- IF topology and avoids both of these shortcomings. In this approach, the signal is first noncoherently down converted to baseband by linear devices, then it is filtered and processed. This paper will discuss the GDP 0-Hz-IF FSK/AM (SGLS) demodulator.

Baigiamajame darbe tiriamas dažninės asinchroninės pavaros greičio stebiklis ir charakteristikos. Įvade yra išnagrinėti greičio stebiklio panaudojimo privalumai. Aptarta dažnio keitiklių svarba asinchroninių variklių valdyme. Analitinėje dalyje nagrinėjamas dažnio keitiklių veikimo principas bei aptariamas dažninių elektros pavarų jėgos grandinių schemos. Aptariami vektorinio ir skaliarinio valdymo privalumai bei trūkumai. Pateikiami pagrindiniai greičio jutikliai bei jų trūkumai ir privalumai. Projektinėje dalyje pateiktas asinchroninio variklio matematinis modelis nejudančioje koordinačių sistemoje bei dažninės pavaros skaliarinio valdymo modelis. Išnagrinėti du greičio stebiklių modeliai. Tiriamojoje dalyje pateikti greičio stebikių modeliai ir dinaminės charakteristikos. / The final project presents the AC induction motor drive control methods and characteristics. In the preface of this project the frequency controlled electric drives and the importance of speed observer are described. In the analytic part frequency controlled electric drives power circuits, speed measuaring and observer operational principle are described. The field oriented or vector and V/Hz or scalar control is analyzed. In the design part the AC induction motor drive mathematical model in stationary reference frame is presented and AC drive scalar control method is considered. Two types of speed observer models are elaborated. In the investigation part of the project the dynamic characteristics of frequency controlled drive and speed observers are presented.

Les champs magnétiques (CM) alternatifs de fréquence 50 Hz liées à l'électricité sont suspectées depuis une trentaine d'années d'être responsables de pathologies, plus précisément de leucémies chez l'enfant. Les derniµeres expertises collectives (WHO 2007, SCENHIR 2009) ont conclu que la dernière grande interrogation en ce qui concerne les CM d'extrêmement basse fréquence (ELF) est l'association statistique observée dans plusieurs analyses conjointes entre l'augmentation du risque de leucémie de l'enfant et une exposition aux CM supérieure à 0,4 µT en valeur moyenne sur 24 heures, sans qu'il n'existe de relation causale. La thµese a pour objectif de caractériser l'exposition de la population française aux champs magnétiques 50 Hz, et en particulier d'identifer les principaux facteurs favorisant l'exposition. Deux échantillons (1000 enfants et 1000 adultes) représentatifs de cette population ont été construits en utilisant la méthode de tirage aléatoire. Chaque personne a portée un EMDEX II mesurant et enregistrant les CM auxquels elle est exposée pendant une durée de 24 heures et à, au fur et à mesure, rempli un emploi du temps ainsi qu'un questionnaire contenant des informations personnelles et des informations relatives à son foyer. Lors de la récupération de l'appareil, l'enquêteur a enregistré les coordonnées GPS du foyer afin d'identifer par la suite l'ensemble des ouvrages électriques se trouvant à proximité du foyer. Pour caractériser les expositions, des modèles de régression non paramétriques ont été réalisés. Ils ont permis d'identifer parmi les données recueillies, les facteurs favorisant les expositions moyennes les plus élevées. Chaque série de mesures de champ magnétique a ensuite été décrite par des indicateurs et une classification ascendante hiérarchique a été appliquée sur ces derniers. Trois classes d'exposition ont ainsi été définies. Une régression logistique a été réalisée pour identifier les facteurs favorisant la probabilité d'appartenir à la classe regroupant les individus les plus exposés.