Summa rerum genera esse tantum duo: substantiam nimirum & accidens, ex suffragio ampliss. facult. philos. in florentissimo ad Auram Athenaeo, sub umbone ... dn. mag. Simonis Tålpo, met & log. professoris famigeratissimi, consistorii Acad. assessoris gravissimi nec non annexae Pijkensis pastoris longe fidelissimi. Summos in philosophia honores aditurus dissertatione philosophica ad sobrie philosophantium examen modeste delata statuere conabitur Jeremias Wallenius J. f. Tavastensis. Ad diem 21. Nov. anni redempti orbis M. DC. XC. IV. Horis pomeridianis in auditorio maximo

Invokaatio: A.J.

Positiones philosophicae ex fragrantissimo philosophiae viridario carptìm collectae. Quas ex consensu amplissimae [et] venerandae facultatis philosophicae in Regiâ Academiâ Aboënsi. Sub praesidio, ... dn. Michaelis Gyllenstålpes, Wexionii, j. u. & philos: doct: pereximii, ll:m polit: & hist: prof: publ: celeberrimi, p. t. rectoris magnifici, moecenatis, praecept. ac promotoris quovis obsequii & honoris genere plurimùm prosequendi. Liberalis exercitij gratia, publicae eruditorum disquisitioni modestè sistit Daniel B. Rosander Smolandus s. r. m.tis stipendiarius. In auditorio majori ad diem 22. Novemb. anno 1654. Horis ab 8. antemeridianis

Variantti A.

De Sveo-Gothis; qui vixerunt sub periodo Erici I.mi. ad Ericum 2.dum: memorans quomodo restituti sunt primum ab Erico, mox tamen ac multos annos ab incertis ducibus vexati, at nunquam vera religione destituti

Variantti B.

De Sveo-Gothis; qui vixerunt sub periodo Erici I.mi. ad Ericum 2.dum: memorans quomodo restituti sunt primum ab Erico, mox tamen ac multos annos ab incertis ducibus vexati, at nunquam vera religione destituti

Variantti A.

De Sveo-Gothis, qvi vixerunt seculis post natum Christum, duobus primis: tradens fidei eorum articulos, ac conversorum nomina, sed cumprimis probans ecclesiae existentiam apud illos, seculo Christi secundo: docens item modum ejus tam propagatae in omnes provincias, quam auctae plurimum in provinciis cunctis

Variantti A.

Sanctus Ansgarius vulgo Svecorum Danorumque apostolus seu Vita Sancti Ansgarii olim â quodam pontificio latine scripta, ac postea ab alio in svecicum idioma translata: at hic rursus in latinum conversa, abbreviata et sobria censurâ theologicâ passim castigata, lucique publicae data

Invokaatio: I.N.J.

De tribus sectis veterum Judaeorum, Pharisaeis scil. Saducaeis ac Hessaeis

Nimekettä edeltää hepreankielinen invokaatio.

De parallaxi annua planetarum primariorum ac cometarum

Painovuosi nimekkeestä.

De annonae saevitia ac fame, ejusque praesagiis, causis, effectis, atque remediis

Invokaatio: I.N.J.

De causa mali prima ac genuina

Invokaatio: In nomine Jesu!

De familiis illustribus & nobilitate Sveo-Gothicâ ac Fennicâ

Arkit: 1 arkintunnukseton lehti, Y-2B8, 1 arkintunnukseton lehti.

Industria philosophiae, quâ cujusvis sectae adversarijs sive status per compendium iri obviam potest, ac multae difficultates unà in disceptationibus felicitèr superari

Invokaatio: I.N.D.O.M.

Electromagnetic and thermal design of a multilevel converter with high power density and reliability

Electric energy demand has been growing constantly as the global population increases. To avoid electric energy shortage, renewable energy sources and energy conservation are emphasized all over the world. The role of power electronics in energy saving and development of renewable energy systems is significant. Power electronics is applied in wind, solar, fuel cell, and micro turbine energy systems for the energy conversion and control. The use of power electronics introduces an energy saving potential in such applications as motors, lighting, home appliances, and consumer electronics. Despite the advantages of power converters, their penetration into the market requires that they have a set of characteristics such as high reliability and power density, cost effectiveness, and low weight, which are dictated by the emerging applications. In association with the increasing requirements, the design of the power converter is becoming more complicated, and thus, a multidisciplinary approach to the modelling of the converter is required. In this doctoral dissertation, methods and models are developed for the design of a multilevel power converter and the analysis of the related electromagnetic, thermal, and reliability issues. The focus is on the design of the main circuit. The electromagnetic model of the laminated busbar system and the IGBT modules is established with the aim of minimizing the stray inductance of the commutation loops that degrade the converter power capability. The circular busbar system is proposed to achieve equal current sharing among parallel-connected devices and implemented in the non-destructive test set-up. In addition to the electromagnetic model, a thermal model of the laminated busbar system is developed based on a lumped parameter thermal model. The temperature and temperature-dependent power losses of the busbars are estimated by the proposed algorithm. The Joule losses produced by non-sinusoidal currents flowing through the busbars in the converter are estimated taking into account the skin and proximity effects, which have a strong influence on the AC resistance of the busbars. The lifetime estimation algorithm was implemented to investigate the influence of the cooling solution on the reliability of the IGBT modules. As efficient cooling solutions have a low thermal inertia, they cause excessive temperature cycling of the IGBTs. Thus, a reliability analysis is required when selecting the cooling solutions for a particular application. The control of the cooling solution based on the use of a heat flux sensor is proposed to reduce the amplitude of the temperature cycles. The developed methods and models are verified experimentally by a laboratory prototype.

Electrical Safety of Island Operated Low Voltage DC Network

Today, renewable energy technologies and modern power electronics have made it feasible to implement low voltage direct current (LVDC) microgrids (MGs) ca-pable to island operation. Such LVDC networks are particularly useful in remote areas. However, there are still pending issues in island operated LVDC MGs like electrical safety and controlled operation, which should be addressed before wide-scale implementation. This thesis is focused on the overall protection of an island operated LVDC network concept, including protection against electrical shocks, mains equipment protection and protection of photovoltaic (PV) power sources and battery energy storage systems (BESSs). The topic is approached through ex-amination of the safety hazards and the appropriate methods to protect against them, comprising considerations for earthing system selection and realisation of the protection system.

Piirilevyn suunnittelu suurelle virralle DC/DC-muuntimeen

Ajoneuvoissa, kuten busseissa, käytetään yleensä 24 VDC järjestelmiä ja tämä ei muutu myöskään sähköajoneuvojen kohdalla. Sähköajoneuvoissakin tarvitaan siis 24 VDC matalajänniteakustoja valoille, pyyhkijöille ja muille matalan jännitteen järjestelmille. Lisäksi sähköajoneuvoissa on esimerkiksi ilmastointi ja paineilmankompressori, jotka tarvitsevat taajuusmuuttajan pyörittämään niitä. Tässä työssä suunnitellaan suuren virran piilevy DC/DC-muuntimeen, joka on osa ajoneuvokäyttöön suunnitellun invertterin ja DC/DC-muuntimen yhdistelmälaitetta. Työn pääpaino on piirilevyn suunnittelussa, mutta työssä kerrotaan lyhyesti koko laitteen kytkentä ja käyttötarkoitus. Työssä kerrotaan myös tehopiirilevylle tulevien komponenttien valinta, mitoitus ja jäähdytys. Käydään läpi suuren virran piirilevysuunnittelun mitoitusperiaatteet ja mitä seikkoja siinä erityisesti tulee ottaa huomioon. Lisäksi käsitellään piirilevyn liityntöjä ja virtakiskojen lämpenemää virranahtautumisen takia. Suunniteltua piirilevyä mitataan ja sen toimintaa kokeillaan prototyyppilaitteessa. Protoyyppilaitteella havaitaan virtakiskojen lämpenevän liikaa ja huomataan ongelma kytkenssä. Kytkentää korjattiin ja toimintaa analysoitiin uudestaan, jonka jälkeen havaittiin piirilevyn lämpenemän tippuneen 20 °C. Lopputuloksena piirilevyn lämpenemä, korjatulla kytkennällä, on suunnitellun mukainen. Lopussa esitetään piirilevyn korvaamista moduuliratkaisulla laitteen parantamiseksi sarjatuotantoon.