5,938 research outputs found
AF Termination: the Holy Grail of persistent AF ablation?
No full textThe optimal catheter ablation approach for long-standing persistent atrial fibrillation (AF) remains elusive despite significant advances made in our understanding of this arrhythmia. A recent systematic review highlighted the significant variation in procedural success rate both within and between techniques, necessitating repeat ablation procedures and anti-arrhythmic drugs to achieve improved outcomes in those with long-standing persistent AF. Indeed, current expert consensus statement recommended ablation beyond ostial pulmonary vein isolation for these patients.Dennis H. Lau, Anthony G. Brooks, and Prashanthan Sandershttp://www.jafib.com/published/published.php?cont=abstract&id=27
The Chromatic Number and Brooks' Theorem
No full textDette speciale er skrevet ved Institut for Matematiske Fag, Aalborg Universitetog behandler begreber indenfor punktfarvning af grafer. Hvis manønsker at punktfarve en graf, står man over for følgende optimeringsproblem:Hvad er det mindste antal farver, der er nødvendige for at kunnetildele en farve til hvert punkt, således at to nabopunkter ikke har sammefarve?Dette mindste tal er kendt som det kromatiske tal og der gives en grundiggennemgang af egenskaber ved dette kromatiske tal for en graf G.Kromatisk grafteori kan dateres tilbage til 1850’erne, hvor Francis Guthrieopdagede det velkendte firfarveproblem: Kan ethvert landkort farves medhøjst fire farver, således at lande, der deler grænse, ikke har samme farve?Hovedvægten lægges på Brooks’ sætning i forskellige udgaver. Brooks bevistei 1941 uligheden mellem maksimumsgraden og det kromatisketal for en graf G. Der redegøres naturligvis for det basale indenforgrafteori og for fundamentale underemner, såsom grådig farvning og kritiskegrafer, og for sætninger, der er essentielle for at forstå og gennemførede beviser, der har interesse i dette speciale.En gennemgang af en nyere version af Brooks’ sætning, udarbejdet af Chartrandog Zhang, viser, at på trods af stor diversitet i terminologi og formulering,er forskellen i den matematiske teknik minimal, da begge anvenderveje, grådig farvning og permutation.I 1976 beviste Paul A. Catlin en sætning, der betragtes som en udvidelseaf Brooks’ sætning. Catlins sætning siger, at hvis en graf G opfylderbetingelserne i Brooks’ sætning, så indeholder G en monokromatisk, maksimal,uafhængig delmængde. For nyligt blev en forenet version af dissebevist og publiceret af Vaidy Sivaraman. Han anvender uafhængighed igrafer, matching og Halls betingelse for at gennemføre beviset. Hans beviser dog utilskrækkeligt, forstået på den måde, at visse mellemregningerog forklaringer er udeladt. Derfor gives der i dette speciale en noget mereuddybende og detaljeret version af beviset.This Master of Science Thesis reviews theconcepts of vertex coloring and encompassesa thorough study of the chromatic numberfor a graph G. The main emphasis is onBrooks’ theorem in various editions. Brooksproved, in 1941, the inequality between agraph’s maximum degree and its chromaticnumber. The basic traits for graphs areaccounted for, as well as fundamentalsubtopics and theorems essential for understandingand completing the proofs ofinterest.An examination of a more recent versionof Brooks’ theorem by Chartrand andZhang reveals that although terminologyand phrasing is very diverse, the disparityin mathematical technique is minimal asboth utilizes paths, greedy coloring, andpermutation.In 1976 Catlin proved an extension to thetheorem of Brooks and recently a unifiedversion of these was published by VaidySivaraman. He utilizes independence ingraphs, matchings, and Hall’s conditionin order to complete the proof. As theoriginal unified proof seemed insufficientin the sense that the author left out someintermediate results and explanations, anelaborate version is presented here
Isrogrogidda Falka Af-soomaaliga: Aragti ku aadan Midaynta Qoraalkiisa
No full textQoraagu wuxuu diraasad ku sameeyey sidii loo midayn lahaa af Soomaaliga qoraaal ahaan loo adeegsada. Gaar ahaan wuxuu diiradda saarayaa sidii loo midayn lahaa qaababka isrogrogga falalka oo haatan loo adeegsado siyaabo aan midaysanayn.In questo articolo, l'autore analizza e avanza una proposta relativamente alla standardizzazione del somalo scritto, in particolar modo delle forme di coniugazione dei verbi somali che attualmente non sono scritte in modo omogenea.In this article, the author analyzes and provides a proposal about the standardization of written Somali, in particular relating to verb conjugation forms whose orthography still differs today.Cabdirashid M. Ismaaciil, Cabdalla C. Mansuur, Saynab A. Sharci (eds.
Coastal Research and its Economic Justification
No full textProper and thorough planning of coastal engineering projects is discussed and the economie justification of research work indicated. Examples are given concerning navigational problems, coastal protection problems, and harbor sediment problems.KWP-collectio
Frá vestranum til vísindamyndarinnar: Birtingarmynd paródíunnar í kvikmyndum Mel Brooks
No full textÍ þessari ritgerð verður fjallað um þrjár af kvikmyndum leikstjórans Mel Brooks út frá hugtakinu um paródíuna. Paródían er víðfeðmt hugtak, en leitast verður við að útskýra mismunandi skilgreiningar hennar sem og mikilvægi sjálfsvísunar fyrir kvikmyndaparódíuna útskýrð. Teknar verða fyrir þrjár kvikmyndir Brooks, Blazing Saddles (1974), Young Frankenstein (1974), og Spaceballs (1987), þær skoðaðar í ljósi þessa hugtaks og greint hvað það er sem gerir þær að paródíum
Midaynta iyo Horumarinta Af-soomaaliga
No full textQoraagu wuxuu maqaalkan ku falanqaynayaa arrimo ku saabsan midaynta af Soomaaliga qoran, oo dadka qaarkood ay ku doodaan in ay dhibaato ka taagantahay, iyagoo u aanaynaya kala duwanaanta lahjadaha Soomaaliyeed iyo farta af Soomaaliga oo aan xasillayn. Qoraha oo soo bandhigayaa in arrimahaasu aanu sax ahayn, wuxuuna muujinayaa caqabadaha dhabta ah ee hortaagan houmarinta af Soomaaliga: afku wuxuu la'yahay dawlad si rasmi ah u adeegsato, weerar ba'anna waxaa ku haya af Ingiriisiga, xagga ereyadana nabaadguur xooggan ayaa ku dhacaya, gaar ahaan ereyada la xiriira dhaqanka Soomaaliyeed.L'autore, in questo articolo, analizzando la questione della lingua somala scritta, cerca di illustrare che la situazione del somalo standard non è cosi problematica come a detta di alcuni somali, specialmente, nell'ortografia e nella differenza tra i dialetti, ma il problema somalo è bensì riscontrabile in altri fattori: la mancanza di un stato che continui ad adottare il somalo come lingua ufficiale, l'estinzione di tantissimi vocaboli in disuso, nonché la forte influenza dalla lingua inglese.The author in this article, in analysing the written somali language, wants to show the somali standard situation is not so bad, like some Somalis say, especially in orthography and in vernaculars difference. In spite of, the somali language problem is recognisable in some others factors: lack of state that usually chooses somali language as official language, extinction of many terms in disuse and also the strong influence of English.Cabdirashid M. Ismaaciil, Cabdalla C. Mansuur, Saynab A. Sharci (eds.
Clinical characteristics to guide the extent of ablation in paroxysmal AF patients: Discovering an old science
No full textAnthony G. Brooks, Narayanan Namboodiri, and Prashanthan Sander
Om inloppet ifrån Östersjön : till SöderTelje eller Egelsta wiken
No full textAuthor: Nathanael Gerhard af Schultén.Dated: "Carlberg den 12 Januari 1806."Digital reproduction, The National Library of Finland, Centre for Preservation and Digitisation, MikkeliA description of the Baltic Sea.TravelEuropeanaSchultén, Nathanael Gerhard af (1750-1825
Dwing als gebiedsontwikkelaar een duidelijke opdracht af
No full textTerwijl de context waarin gebiedsontwikkelaars werken alleen maar complexer wordt, ziet Co Verdaas, hoogleraar gebiedsontwikkeling, een aanhoudende neiging om keuzes vooruit te schuiven of te verhullen. Hij geeft zes tips om gebiedsontwikkelaars in hun kracht te zetten. “Zonder escalatie geen resultaat zou het devies moeten zijn.”Practice Chair Urban Area Developmen
Home-based education and learning program for atrial fibrillation: rationale and design of the HELP-AF study
No full textBACKGROUND:Atrial fibrillation (AF) is a growing global epidemic, with its prevalence expected to significantly rise over coming decades. AF poses a substantial burden on health care systems, largely due to hospitalizations. Home-based clinical characterization has demonstrated improved outcomes in cardiac populations, but its impact on AF remains poorly defined. To test this hypothesis in AF, we developed the Home-Based Education and Learning Program for Patients With Atrial Fibrillation (HELP-AF) study. METHODS:The HELP-AF study is a prospective multicentre randomized controlled trial that will recruit 620 patients presenting to hospital emergency departments (EDs) with symptomatic AF (ANZCTR Registration: ACTRN12611000607976). Patients will be randomized to either the HELP-AF intervention or usual care. The intervention consists of 2 home visits by a nurse or pharmacist trained in the structured educational visiting (SEV) method. Patients in the control group will receive usual discharge follow-up care. RESULTS:The primary endpoints are total unplanned hospital admissions and quality of life. Secondary endpoints include AF symptom severity and burden score; time to first hospital admission; total unplanned days in hospital; total AF-related hospital admissions (including atrial flutter); total cardiac and noncardiac hospital admissions; total AF- or atrial flutter-related; cardiac- and noncardiac-related ED presentations; and all-cause mortality. An economic evaluation will also be performed. Clinical endpoints will be adjudicated by independent blinded assessors. Follow-up will be at 24 months. CONCLUSIONS:This study will assess the efficacy of a home-based structured patient-centred educational intervention in patients with AF.Jeroen M. Hendriks, Anthony G. Brooks, Debra Rowett, John R. Moss, Celine Gallagher, Karin Nyfort-Hansen, Shalini Simmons, Melissa E. Middeldorp, Tina Jones, Gijo Thomas, Dennis H. Lau and Prashanthan Sander
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