Le funzioni Gamma di Eulero e Zeta di Riemann e il loro utilizzo nel calcolo dell'azione efficace di un campo sclare

Lo scopo di questa tesi è introdurre le due funzioni speciali, la Gamma di Eulero e la Zeta di Riemann, per poter successivamente impiegarle in un contesto della fisica. Il percorso porta, una volta trattate le due funzioni, a descrivere l'integrale sui cammini di Feynmann e l'oscillatore armonico forzato quantomeccanico, attraverso cui è possibile introdurre l'azione efficace. Una volta introdotta l'azione efficace viene accennata la teoria classica dei campi, per poi poter calcolare l'azione efficace di un campo scalare. Il calcolo di quest'ultima sarà ridotto formalmente al calcolo di un determinante funzionale, ed è qui dove entrano in gioco le funzioni trattate all' inizio del percorso, che permettono di regolarizzare un risultato altrimenti divergente. In conclusione, dopo aver trovato un metodo per poter calcolare l'azione efficace di un campo scalare si compie l'operazione che sta alla base di esso, ossia calcolare l'operatore nucleo dell'equazione del calore dell'operatore il cui determinante porta all'azione efficace

An economic and logistical analysis of increased storage capacity and structuring of storage at Domsjö Fiber AB : a design of Domsjö Fibers bearing surfaces

Skogsbrukets industrier kräver ofta en stor lagerhållningskapacitet. Kostnaderna för dessa lager är ofta höga och inte sällan är lagringsplatserna för virket inte genomtänkta, vilket leder till att allt fler företag börjar se över sin internlogistik. Domsjö Fibers huvudsakliga uppgift är att försörja ägarbolagen med råvara. Företaget har uppmärksammat att inlåsningseffekter förekommer på lagerytorna och vill undersöka hur dessa effekter kan minimeras utan att minska lagerkapacitet. Syftet med studien var att ta fram ett antal handlingsalternativ för en ny lagerstruktur åt Domsjö Fiber AB och även göra en ekonomisk redovisning för upprustningskostnader av nya lagerytor för att kompensera för omstruktureringen av deras befintligt lager. I studien utformades med hjälp av inmätningar i ArcMap tre handlingsalternativ för att tillgodose Domsjö Fiber ABs behov med varierande prioriteringar. Det första alternativet prioriterade att lösa de inlåsningseffekter som Domsjö Fiber AB hade, det andra alternativet fokuserade på att lagra så stora virkesarealer som möjligt på virkesplanen. Det tredje alternativet hade samma fokus som alternativ ett, bortsett från att man inte skulle ta bort den tågräls som finns på virkesplan idag. Alternativen medförde kostnadsförändringar för truckarna. Studien visar då att de största besparingarna i transportkostnader för timmertruckarna resulterade i 99788kr/år p.g.a. minskade transportsträckor. Det alternativ som ansågs som det val som ger bäst resultat är efter undersökning alternativ ett, med den lilla verkstaden som finns på virkesplanen borttagen. Detta för att man då utan lagerförluster kan lagra virket utan inlåsningseffekter och minska sina transportkostnader. Efter upprättande av en ekonomisk kalkyl bedöms kostnaden för att upprusta de idag delvis obrukbara lagerytorna till 5,7 milj.kr, förutsatt att detta görs internt av Domsjö Fiber AB.De osäkerheter som bör klargöras i praktiken av Domsjö Fiber AB är hur mycket en saneringsutredning kan komma att påverka priset för upprustningen.Forestry industries often require a large storage capacity. The cost of these stocks are often high and the wood yard surfaces are often not very well planned, and because of this more companies start to review their internal logistics. Domsjö Fiber AB is owned by Övik Energi AB and Domsjö Fabriker AB and their main purpose is to support the holding companies with raw material. The company has noted that lock-in effects occur on the bearing surfaces and would like to examine how these effects can be minimized without reducing storage capacity. The purpose of the study was to develop a number of options for a new stock structure to Domsjö Fiber AB, and also to make a financial report for the renovation costs of new storage surfaces to compensate for the restructuring of the existing stock surfaces. Three different options was designed with the tool ArcMap, to meet Domsjö Fiber AB’s needs with varying priorities. The first option prioritized solving the lock-in effects Domsjö Fiber AB was having, the second option focused on storing as much timber as possible in the timber field, without lock-in effects taken into account. The third option had the same focus as the first option, except that it would not remove the railroad available on the wood yard today. The different options entailed changes in costs for the log-handlers, the study will show that the largest savings in transportation costs for log-handlers resulted in 99788kr/year due to reduced transportation distances. The option that’s considered as the choice that gives the best results are after studying the different alternatives option one, with the small workshop located in the timber field deleted. This because you can store the timber without the lock-in effects and reduce their transportation costs without any losses of inventory. After establishing an economic analysis the cost to renovate the now partly unusable bearing surfaces ended up at a cost of 5700 000 kr , provided that this is done internally by Domsjö Fiber AB. The uncertainties that should be made clear in the practice of Domsjö Fiber AB is to do a clean-up inquiry, which may come to affect the price of rearmament

Homenaje a bertolt brecht

Comprende los textos: Diario 1948, de Max Frisch (traducción de Elviera Bobach); Brecht y la actualidad del realismo, de Elviera Bobach; Textos inéditos en español -- 'Pequeña contribución al problema del realismo' (traducción de Elviera Bobach), 'Sobre la verdad' y Anexos a la teoría de 'La compra del latón' (traducción de Freddy Téllez)

Homenaje a bertolt brecht

Comprende los textos: Diario 1948, de Max Frisch (traducción de Elviera Bobach); Brecht y la actualidad del realismo, de Elviera Bobach; Textos inéditos en español -- 'Pequeña contribución al problema del realismo' (traducción de Elviera Bobach), 'Sobre la verdad' y Anexos a la teoría de 'La compra del latón' (traducción de Freddy Téllez)

A simulation suite for readout with SMuRF tone-tracking electronics

We present the details of a simulation suite for modeling the effects of readout with SLAC Microresonator RF (SMuRF) electronics. The SMuRF electronics are a warm readout and control system for use with superconducting microwave resonator-based detector systems. The system has been used with the BICEP/Keck program and will be used on the upcoming Simons Observatory and BICEP Array experiments. This simulation suite is a software implementation of the main SMuRF algorithms for offline analysis, modeling, and study. The firmware-implemented algorithms for calibration, resonator frequency estimation, and tone tracking present sources of potential bias or errors if not modeled properly. The simulator takes as input true detector signal, realistic resonator properties, and SMuRF-related user-controlled readout settings. It returns the final flux ramp-demodulated output of a detector timestream as would be passed to the experiment data acquisition system, enabling the analysis of the impact of readout-related parameters on the final science data. It is publicly available in Python with accompanying Jupyter notebooks for user tutorials.Comment: 12 pages + references, 7 figures. Proceedings for SPIE Astronomical Telescopes and Instrumentation 2022. Code at https://github.com/cyndiayu/babysmur

Atrioventricular Nodal Reentrant Tachycardia Ablation with a Power-controlled, Contact-force Catheter.

Radiofrequency catheter ablation is a safe and effective treatment option for atrioventricular nodal reentrant tachycardia (AVNRT). A nonirrigated ablation catheter used in a temperature-controlled mode is traditionally used for AVNRT ablation due to the shallow lesion depth required for successful slow-pathway ablation. In this case, a nonirrigated ablation catheter established inadequate lesions to ablate the slow pathway successfully. The adoption of an irrigated contact-force ablation catheter used in a power-controlled mode was necessary to provide higher power and possibly create a deeper lesion to ablate the slow pathway successfully, thus eliminating AVNRT inducibility in this patient

Adverse Outcomes of Atrial Fibrillation Ablation in Heart Failure Patients With and Without Cardiac Amyloidosis: A Nationwide Readmissions Database Analysis (2015-2019)

AIMS: Atrial fibrillation (AF) in patients with cardiac amyloidosis (CA) has been linked with a worse prognosis. The current study aimed to determine the outcomes of AF catheter ablation in patients with CA. METHODS AND RESULTS: The Nationwide Readmissions Database (2015-2019) was used to identify patients with AF and concomitant heart failure. Among these, patients who underwent catheter ablation were classified into two groups, patients with and without CA. The adjusted odds ratio (aOR) of index admission and 30-day readmission outcomes was calculated using a propensity score matching (PSM) analysis. A total of 148 134 patients with AF undergoing catheter ablation were identified on crude analysis. Using PSM analysis, 616 patients (293 CA-AF, 323 non-CA-AF) were selected based on a balanced distribution of baseline comorbidities. At index admission, AF ablation in patients with CA was associated with significantly higher adjusted odds of net adverse clinical events (NACE) [adjusted odds ratio (aOR) 4.21, 95% CI 1.7-5.20], in-hospital mortality (aOR 9.03, 95% CI 1.12-72.70), and pericardial effusion (aOR 3.30, 95% CI 1.57-6.93) compared with non-CA-AF. There was no significant difference in the odds of stroke, cardiac tamponade, and major bleeding between the two groups. At 30-day readmission, the incidence of NACE and mortality remained high in patients undergoing AF ablation in CA. CONCLUSION: Compared with non-CA, AF ablation in CA patients is associated with relatively higher in-hospital all-cause mortality and net adverse events both at index admission and up to 30-day follow-up