56,385 research outputs found
The hardware impairments impact on fixed-gain AF relaying performance in Nakagami-m fading
No full textThe effects of joint hardware impairments on the performance of fixed gain amplify-and-forward (AF) relaying are studied. By considering IQ imbalance at the source and destination and the nonlinear relay the outage probability over Nakagami-m fading channels is derived, and the effects of fading and hardware impairments on the system are analysed.
The analytical results are verified by Monte Carlo simulations
Framing: Til afklaring af et spredt paradigme
Get PDFI denne klassiske artikel om framing-begrebet giver Robert M. Entman en udfoldet definition af framing, ligesom han argumenterer for, at frames findes i hele kommunikationsprocessen, dvs. hos afsenderen, i teksten, hos modtageren og i kulturen. Framing-begrebet har været anvendt i mange discipliner, men kommunikationsforskningen kan med fordel være den centrale overdisciplin, der samler spredte bidrag til en konsistent definition af begrebet. Kommunikationsforskningen kan på denne måde dels styrke sin egen teoretiske stringens og dels bidrage til afklaring af en række problemer i en række andre discipliner vedr. teksters betydning og indflydelse. Artiklen er oprindeligt publiceret i Journal of Communication i 1993. Artiklen er oversat af Stig Hjarvard
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.
[Eksliibris Marius af Schulténile]
No full text1 tõmmis : lito, trükitud mustaga pl. 8,5 x 6,5 cm l. 9,4 x 7,2 cmNelinurkses raamistuses tumedal taustal kaks joonia sammast toestamas tala. Joonises all: EX / LIBRIS / MARIUS AF SCHULTÉN;"M. Kinos. Exlibris. Oul
Validating the predictive ability of the 2MACE score for major adverse cardiovascular events in patients with atrial fibrillation: results from phase II/III of the GLORIA-AF registry
Get PDFThe 2MACE score was specifically developed as a risk-stratification tool in atrial fibrillation (AF) to predict cardiovascular outcomes. We evaluated the predictive ability of the 2MACE score in the GLORIA-AF registry. All eligible patients from phase II/III of the prospective global GLORIA-AF registry were included. Major adverse cardiac events (MACEs) were defined as the composite outcome of stroke, myocardial infarction and cardiovascular death. Cox proportional hazards were used to examine the relationship between the 2MACE score and study outcomes. Predictive capability of the 2MACE score was investigated using receiver-operating characteristic curves. A total of 25,696 patients were included (mean age 71 years, female 44.9%). Over 3 years, 1583 MACEs were recorded. Patients who had MACE were older, with more cardiovascular risk factors and were less likely to be managed using a rhythm-control strategy. The median 2MACE score in the MACE and non-MACE groups were 2 (IQR 1–3) and 1 (IQR 0–2), respectively (p < 0.001). The 2MACE score was positively associated with an increase in the risk of MACE, with a score of ≥ 2 providing the best combination of sensitivity (69.6%) and specificity (51.6%), HR 2.47 (95% CI, 2.21–2.77). The 2MACE score had modest predictive performance for MACE in patients with AF (AUC 0.655 (95% CI, 0.641–0.669)). Our analysis in this prospective global registry demonstrates that the 2MACE score can adequately predict the risk of MACE (defined as myocardial infarction, CV death and stroke) in patients with AF. Clinical trial registration: http://www.clinicaltrials.gov . Unique identifiers: NCT01468701, NCT01671007 and NCT0193737
MORPHOLOGICAL-CHANGES DURING OXIDATION OF A SINGLE CHAR PARTICLE
No full textThe e v o l u t i o n of pore s i z e d i s t r i b u t i o n d u r i n g t h e o x i d a t i o n of
s i n g l e Spherocarb c h a r p a r t i c l e s has been measured u n d e r c h e m i c a l
c o n t r o l l e d c o n d i t i o n s . E l e c t r o d y n a m i c a l l y l e v i t a t e d p a r t i c l e s were
heated t o r e a c t i o n t e m p e r a t u r e u s i n g a l a s e r and t h e weight and s i z e
changes m o n i t o r e d . The l a s e r h e a t i n g was i n t e r r u y p t e d a t s e l e c t e d
c o n v e r s i o n s and t h e C 0 2 a d s o r p t i o n determined at ambient c o n d i t i o n s .
A s r e a c t i o n p r o c e e d s , p a r t i c l e s a r e found t o s h r i n k , t h e macropore
volume d e c r e a s e s i n p r o p o r t i o n t o t h e t o t a l p a r t i c l e volume,
m a i n t a i n i n g a c o n s t a n t m a c r o p o r o s i t y . The micropore volume, however,
d e c r e a s e s w i t h i n c r e a s i n g c o n v e r s i o n whereas t h e n o r m a l i z e d p o r e
size d i s t r i b u t i o n remains unchanged, s u g g e s t i n g t h a t t h e
d e n s i f i c a t i o n of t h e microporous volume which l e a d s to. p a r t i c l e
s h r i n k a g e r e s u l t s from pore e l i m i n a t i o n . A t t h e same time t h e
mesopore volume i n c r e a s e s with i n c r e a s i n g c o n v e r s i o n i n d i c a t i n g t h a t
t h e mesopores play a dominant r o l e i n t h e c h a r r e a c t i o
Clinical predictors of atrial fibrillation recurrence in the Gruppo Italiano per lo Studio della Sopravvivenza nell'Infarto Miocardico-Atrial Fibrillation (GISSI-AF) trial
No full textBackground - Atrial fibrillation (AF) is a common arrhythmia that frequently recurs after restoration of sinus rhythm (SR). Identifying risk factors for recurrence may help define the best strategy for secondary prevention. Methods - The GISSI-AF trial enrolled 1,442 patients in SR with at least 2 documented AF episodes in the previous 6 months or after cardioversion in the last 2 weeks. Patients were randomized to valsartan or placebo; all other treatments for AF or underlying heart diseases were allowed. Primary end points were time to first recurrence of AF and proportion of patients with >1 AF episode during 1-year follow-up. We evaluated clinical and electrocardiographic baseline characteristics of all patients to identify independent predictors for AF recurrence using a Cox multivariable model. Results - Risk factors for AF recurrence were a history of 2 or more AF episodes in the previous 6 months, independent of the modality of SR restoration, spontaneous (HR 1.42, 95% CI 1.14-1.77, P = .002), or by cardioversion (HR 1.19, 95% CI 1.01-1.40, P = .038), and a lower heart rate during SR (HR 0.99, 95% CI 0.99-1.00, P = .052). The risk factors were the same for > 1 AF recurrence. Patients treated with amiodarone had a lower risk for both end points (P < .0001 and P = .017), whereas those on diuretics had a greater risk (P = .009 and P = .003). Conclusions - In the GISSI-AF study population, AF history had significant prognostic value independent of the modality of SR restoration. Amiodarone and diuretic treatment affected the rate of AF recurrence
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.
Early rhythm-control ablation therapy in preventing AF recurrences: insight from the CHARISMA Registry
No full textBackground: An early and comprehensive rhythm-control therapy emerges as a need to treat AF in an effective way and to improve the ablation outcomes, in terms of arrhythmia-free survival.
Purpose: We aimed to investigate the importance of timing of ablation in preventing AF recurrences.
Methods: 153 consecutive patients (pts) undergoing AF ablation from the CHARISMA registry at 8 Italian centres were included. Ablations were guided by a novel radiofrequency ablation catheter with local impedance (LI)-sensing capability through a dedicated algorithm (DirectSense, Boston Scientific). Pts were grouped as early treated (ET) if the procedure was performed within 1 year after the first AF episode and as delayed treated (DT) if admitted for ablation after more than 1 year. The ablation endpoint was PVI as assessed by entrance and exit block. Post-ablation follow-up was scheduled at 3, 6 and 12 months. AF and atrial tachycardia (AT) recurrences were considered as long-term endpoint.
Results: Of the 153 pts enrolled (69.9% male, 59±10 years, 61.4% paroxysmal AF, 38.6% persistent AF), 123 (80.4%) met Class I indications, 23 (15%) Class IIa indications and 7 (4.6%) Class IIb indications according to current ESC AF guidelines. The mean time to ablation procedure from the first AF episode was 1034±1483 days. Eighty pts (52.3%) were included in ET group, whereas 73 pts (47.7%) in DT group. No differences were found between AF type in terms of ablation strategy (53.3% of the cases -52 out 94- were classified as ET for paroxysmal AF vs 47.5% of the cases -28 out 59- were ET for persistent AF, p=0.4346). At the end of the procedures, all PVs had been successfully isolated in all study pts. During a mean follow-up of 366±130 days, 18 pts (11.8%) suffered an AF/AT recurrence after the 90-day blanking period. Recurrences occurred mostly in the DT group compared to the ET one (13 out 73 -17.8%- vs 5 out 80 -6.3%-, p=0.042) and the time to AT/AF recurrence was longer in the ET group (HR=0.2876, 95%CI: 0.1029 to 0.8038; p=0.0181). On multivariate logistic analysis adjusted for baseline confounders, only hypertension (HR=4.66, 95%CI: 1.5 to 14.48, p=0.0081) was independently associated with recurrences. An early rhythm-control therapy was associated with a low risk of recurrences beyond the hypertension risk factor, ranging from 2% (no hypertension and an ET ablation therapy) to 30.3% (with hypertension and a DT procedure) (Figure 1).
Conclusion: A LI-guided ablation strategy for PVI proved to be safe and effective and resulted in a very high recurrence-free rate. An early rhythm-control therapy in the absence of common risk factors was associated with the lowest rate of recurrences
Do Robots Complement or Substitute for Older Workers?
Get PDFThe impact of robotization on labor market outcomes has been recently empirically investigated along
several directions, including employment, wages and labor productivity. This work contributes to this
literature by looking for heterogeneous effects of robots on the workforce, analyzed by age cohorts. Relying
on a panel of data from IFR (2019) and EU KLEMS (2009) over the years 1994-2005, we find consistent
evidence of higher complementarity between robots and older workers (hours worked by employees aged 50
and over), and a greater substitutability among robots and younger cohorts of the labor market. These
findings are robust to age group disaggregation and specific capital price deflators
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