22,273 research outputs found
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
First observation of the decay Bs0→K*0K*0
No full textThe first observation of the decay B0s→K∗0K∗0 is reported using 35 pb−1 of data collected by LHCb in proton–proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8±7.5 B0s→(K+π−)(K−π+) events are observed within ±50 MeV/c2 of the B0s mass and 746 MeV/c2 < mKπ < 1046 MeV/c2, mostly coming from a resonant B0s→K∗0K∗0 signal. The branching fraction and the CP-averaged K∗0 longitudinal polarization fraction are measured to be B(B0s→K∗0K∗0)=(2.81±0.46(stat.)±0.45(syst.)±0.34(fs/ fd))×10−5 and fL =0.31±0.12(stat.)±0.04(syst.)
Algorithmic QUBO formulations for k-SAT and hamiltonian cycles
No full textQuadratic Unconstrained Binary Optimization (QUBO) can be seen as a generic language for optimization problems. QUBOs attract particular attention since they can be solved with quantum hardware, like quantum annealers or quantum gate computers running QAOA. In this paper, we present two novel QUBO formulations for k-SAT and Hamiltonian Cycles that scale significantly better than existing approaches. For k-SAT we reduce the growth of the QUBO matrix from O(k) to O(log(k)). For Hamiltonian Cycles the matrix no longer grows quadratically in the number of nodes, as currently, but linearly in the number of edges and logarithmically in the number of nodes. We present these two formulations not as mathematical expressions, as most QUBO formulations are, but as meta-algorithms that facilitate the design of more complex QUBO formulations and allow easy reuse in larger and more complex QUBO formulations.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Quantum Circuit Architectures and Technolog
Calling the judiciary to account for the past : transitional justice and judicial accountability in Nigeria
No full textInstitutional and individual accountability is an important feature of societies in transition from conflict or authoritarian rule. The imperative of accountability has both normative and transformational underpinnings in the context of restoration of the rule of law and democracy. This article argues a case for extending the purview of truth-telling processes to the judiciary in postauthoritarian contexts. The driving force behind the inquiry is the proposition that the judiciary as the third arm of government at all times participates in governance. To contextualize the argument, I focus on judicial governance and accountability within the paradigm of Nigeria’s transition to democracy after decades of authoritarian military rule
Comment to the editorial by KS Park and EW Kang “Is only fixed positive airway pressure a robust tool for kidney protection in patients with obstructive sleep apnea?”
No full textNot availabl
Establishment of the contemporary Slovenian author
No full textKoncept avtorja se je skozi čas spreminjal. V antiki je avtor veljal za avtoriteto, vzor in genija, v (post)strukturalizmu, ko je osrednje mesto zavzel tekst, so razglašali avtorjevo smrt, v današnjem času hiperprodukcije literature pa je ponovno obujen, njegova vloga pa korenito predrugačena: avtor s tem, ko sodeluje v promociji, književnemu delu omogoča preživetje. Avtor, ki se ne želi tržiti, na književnem trgu posledično obstane le s težavoče želi, da njegovo delo ni spregledano, mora biti viden in se zavestno uveljavljati. Prav proces uveljavljanja raziskujem tudi v svoji magistrski nalogi. Podrobneje me zanima, katere entitete omogočajo avtorjevo uveljavljanje in do kakšne mere se kot posameznik lahko zoperstavlja tržni logiki. Ker odločilno vlogo v tem procesu igrajo mediji in založbe, sem opravila intervjuje s petimi slovenskimi medijskimi uredništvi (in raziskala, na kak način izbirajo avtorje, o katerih poročajo, kako skrbijo za uravnovešenost, na kak način prestavljajo avtorje ipd.) ter s šestimi založbami (zanimalo me je, kako pristopajo k promociji, kakšni avtorji so zanje zanimivi, kako sodelujejo z mediji ipd.). Kot pomemben faktor v procesu uveljavljanja oboji omenjajo literarne nagrade, predvsem nagrado kresnik, ki jo podeljuje časnik Delo – vlogi slednje se posvečam v zadnjem poglavju. V sklepu izpostavljam dobre prakse, ki v slovenskem prostoru prispevajo k uveljavljanju še neuveljavljenih avtorjev, in podajam predloge izboljšav, do katerih bi lahko prišlo v medijih in založništvu.The concept of the author has changed over time. In antiquity, the author was considered an authority, a role model and a geniusin (post-)structuralism, when the text took centre stage, the death of the author was proclaimedin today\u27s age of the hyperproduction of literature, the author has been revived, and his/her role radically reshaped: the author, by taking part in the promotion, enables the literary work to survive. The author who does not want to market himself/herself will consequently find it difficult to stay on the literary marketif he/she wants his/her work not to be overlooked, he/she must be visible and consciously assert himself/herself. In my master’s thesis, this process of assertion has been explored. In more detail, I am interested in which entities enable the author to assert himself/herself and to what extent can he/she as an individual challenge the logic of the market. Since the media and publishing houses play a decisive role in this process, I interviewed five Slovenian media editorial offices (to find out how they choose the authors they cover, how they ensure balance, how they shift authors, etc.) and six publishing houses (to find out how they approach promotion, which authors are interesting to them, how they cooperate with the media, etc.). Both mention literary prizes as an important factor in the process of promotion, especially the kresnik prize awarded by the Delo newspaper – the role of the latter is discussed in the last chapter. In the conclusion, good practices that contribute to the promotion of non-established authors in Slovenia are highlighted and suggestions for improvements that could be made in the media and publishing are listed
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Chlorhexidine decreases the risk of ventilator-associated pneumonia in intensive care unit patients: a randomized clinical trial
No full textOzcaka O, Basoglu OK, Buduneli N, Tasbakan MS, Bacakoglu F, Kinane DF. Chlorhexidine decreases the risk of ventilator-associated pneumonia in intensive care unit patients: a randomized clinical trial. J Periodont Res 2012; 47: 584592. (C) 2012 John Wiley & Sons A/S Background and Objective: The aim was to evaluate whether oral swabbing with 0.2% chlorhexidine gluconate (CHX) decreases the risk of ventilator-associated pneumonia (VAP) in intensive care unit (ICU) patients. Material and Methods: Sixty-one dentate patients scheduled for invasive mechanical ventilation for at least 48 h were included in this randomized, double-blind, controlled study. As these patients were variably incapacitated, oral care was provided by swabbing the oral mucosa four times/d with CHX in the CHX group (29 patients) and with saline in the control group (32 patients). Clinical periodontal measurements were recorded, and lower-respiratory-tract specimens were obtained for microbiological analysis on admission and when VAP was suspected. Pathogens were identified by quantifying colonies using standard culture techniques. Results: Ventilator-associated pneumonia developed in 34/61 patients (55.7%) within 6.8 d. The VAP development rate was significantly higher in the control group than in the CHX group (68.8% vs. 41.4%, respectively; p = 0.03) with an odds ratio of 3.12 (95% confidence interval = 1.098.91). Acinetobacter baumannii was the most common pathogen (64.7%) of all species identified. There were no significant differences between the two groups in clinical periodontal measurements, VAP development time, pathogens detected or mortality rate. Conclusion: The finding of the present study, that oral care with CHX swabbing reduces the risk of VAP development in mechanically ventilated patients, strongly supports its use in ICUs and indeed the importance of adequate oral hygiene in preventing medical complications
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