1,827,549 research outputs found
Version 3 of {\tt RunDec} and {\tt CRunDec}
We present new versions of the packages {\tt RunDec} and {\tt CRunDec} which
can be used for the running and decoupling of the strong coupling constant and
quark masses. Furthermore several conversion formulae for heavy quark masses
are implemented. The new versions include five-loop corrections of the QCD beta
function and four-loop decoupling effects. Furthermore, various relations
between the heavy quark mass defined in the and other
short-distance schemes are implemented to next-to-next-to-next-to-leading
order. We discuss in detail the improvements and provide several examples which
show how {\tt RunDec} and {\tt CRunDec} can be used in frequently occurring
situations.Comment: 21 pages, 2 figure
The real photon structure functions in massive parton model in NLO
We investigate the one-gluon-exchange () corrections to the
real photon structure functions , , and
in the massive parton model.
We employ a technique based on the Cutkosky rules and the reduction of
Feynman integrals to master integrals. We show that a positivity constraint,
which is derived from the Cauchy-Schwarz inequality, is satisfied among the
unpolarized and polarized structure functions , and
calculated up to the next-to-leading order in QCD.Comment: arXiv admin note: text overlap with arXiv:1110.262
Tippe Top Equations and Equations for the Related Mechanical Systems
The equations of motion for the rolling and gliding Tippe Top (TT) are
nonintegrable and difficult to analyze. The only existing arguments about TT
inversion are based on analysis of stability of asymptotic solutions and the
LaSalle type theorem. They do not explain the dynamics of inversion. To
approach this problem we review and analyze here the equations of motion for
the rolling and gliding TT in three equivalent forms, each one providing
different bits of information about motion of TT. They lead to the main
equation for the TT, which describes well the oscillatory character of motion
of the symmetry axis during the inversion. We show also that
the equations of motion of TT give rise to equations of motion for two other
simpler mechanical systems: the gliding heavy symmetric top and the gliding
eccentric cylinder. These systems can be of aid in understanding the dynamics
of the inverting TT
Impact of IFN lambda 3/4 single nucleotide polymorphisms on the cytomegalovirus reactivation in autologous stem cell transplant patients
Cytomegalovirus (CMV) infection represents one of the main cause mortality after Stem Cell Transplantation. Recently, a protective effect of the T allele of rs12979860 IL28B Single Nucleotide Polymorphisms (SNPs) against CMV infection in the allogenic stem cell transplantation was suggested. We investigate whether the rs12979860 IL28B SNP and the relative rs368234815 (IFNλ4) genotype may affect the incidence of active CMV infection in Autologous stem cell transplantation (Auto-SCT) setting. The study included 99 patients who underwent to Auto-SCT. IL28 and IFNΔ4 SNPs were correlated with CMV reactivation along with other clinical and treatment parameters. CMV reactivation by CMV DNAemia was evaluated once a week until day 100 from Auto-SCT. CMV reactivation was documented in 50% (TT-ΔG/ΔG), 35% (CC-TT/TT) and 29.2% (CT-TT/ΔG) of the patients respectively. No differences in CMV copies number were recorded at reactivation between different IL28/IFNλ4 genotypes. The analysis of patients older than 60 years showed a significantly higher incidence of active CMV infection in the TT-ΔG/ΔG (83%) population with respect to CC-TT/TT (21%) and CT-TT/ΔG (40%) patients. Our data suggest a negative role of TT-ΔG/ΔG genotype in the CMV reactivation in Auto-SCT. The exposure to rituximab and the pre-infusion presence of anti CMV IgG also significantly influenced CMV reactivation
Efficient tensor completion for color image and video recovery: Low-rank tensor train
This paper proposes a novel approach to tensor completion, which recovers
missing entries of data represented by tensors. The approach is based on the
tensor train (TT) rank, which is able to capture hidden information from
tensors thanks to its definition from a well-balanced matricization scheme.
Accordingly, new optimization formulations for tensor completion are proposed
as well as two new algorithms for their solution. The first one called simple
low-rank tensor completion via tensor train (SiLRTC-TT) is intimately related
to minimizing a nuclear norm based on TT rank. The second one is from a
multilinear matrix factorization model to approximate the TT rank of a tensor,
and is called tensor completion by parallel matrix factorization via tensor
train (TMac-TT). A tensor augmentation scheme of transforming a low-order
tensor to higher-orders is also proposed to enhance the effectiveness of
SiLRTC-TT and TMac-TT. Simulation results for color image and video recovery
show the clear advantage of our method over all other methods.Comment: Submitted to the IEEE Transactions on Image Processing. arXiv admin
note: substantial text overlap with arXiv:1601.0108
Total or near-total thyroidectomy versus subtotal thyroidectomy for multinodular non-toxic goitre in adults
Background
Total thyroidectomy (TT) and subtotal thyroidectomy (ST) are worldwide treatment options for multinodular non-toxic goitre in adults. Near TT, defined as a postoperative thyroid remnant less than 1 mL, is supposed to be a similarly effective but safer option than TT. ST has been shown to be marginally safer than TT, but it may leave an undetected thyroid cancer in place.
Objectives
The objective was to assess the effects of total or near-total thyroidectomy compared to subtotal thyroidectomy for multinodular non-toxic goitre.
Search methods
We searched the Cochrane Library, MEDLINE, PubMed, EMBASE, as well as the ICTRP Search Portal and ClinicalTrials.gov. The date of the last search was 18 June 2015 for all databases. No language restrictions were applied.
Selection criteria
Two review authors independently scanned the abstract, title or both sections of every record retrieved to identify randomised controlled trials (RCTs) on thyroidectomy for multinodular non-toxic goitre for further assessment.
Data collection and analysis
Two review authors independently extracted data, assessed studies for risk of bias and evaluated overall study quality utilising the GRADE instrument. We calculated the odds ratio (OR) and corresponding 95% confidence interval (CI) for dichotomous outcomes. A random-effects model was used for pooling data.
Main results
We examined 1430 records, scrutinized 14 full-text publications and included four RCTs. Altogether 1305 participants entered the four trials, 543 participants were randomised to TT and 762 participants to ST. A total of 98% and 97% of participants finished the trials in the TT and ST groups, respectively. Two trials had a duration of follow-up between 12 and 39 months and two trials a follow-up of 5 and 10 years, respectively. Risk of bias across studies was mainly unknown for selection, performance and detection bias. Attrition bias was generally low and reporting bias high for some outcomes. In the short-term postoperative period no deaths were reported for both TT and ST groups. However, longer-term data on all-cause mortality were not reported (1284 participants; 4 trials; moderate quality evidence). Goiter recurrence was lower in the TT group compared to ST. Goiters recurred in 0.2% (1/425) of the TT group compared to 8.4% (53/632) of the ST group (OR 0.05 (95% CI 0.01 to 0.21); P < 0.0001; 1057 participants; 3 trials; moderate quality evidence). Re-intervention due to goitre recurrence was lower in the TT group compared to ST. Re-intervention was necessary in 0.5% (1/191) of TT patients compared to 0.8% (3/379)of ST patients (OR 0.66 (95% CI 0.07 to 6.38); P = 0.72; 570 participants; 1 trial; low quality evidence). The incidence of permanent recurrent laryngeal nerve palsy was lower for ST compared with TT. Permanent recurrent laryngeal nerve palsy occurred in 0.8% (6/741) of ST patients compared to 0.7% (4/543) of TT patients (OR 1.28, (95% CI 0.38 to 4.36); P = 0.69; 1275 participants; 4 trials; low quality evidence). The incidence of permanent hypoparathyroidism was lower for ST compared with TT. Permanent hypoparathyroidism occurred in 0.1% (1/741) of ST patients compared to 0.6% (3/543) of TT patients (OR 3.09 (95% CI 0.45 to 21.36); P = 0.25; 1275 participants: 4 trials; low quality evidence). The incidence of thyroid cancer was lower for ST compared with TT. Thyroid cancer occurred in 6.1% (41/669) of ST patients compared to 7.3% (34/465)of TT patients (OR 1.32 (95% CI 0.81 to 2.15); P = 0.27; 1134 participants; 3 trials; low quality evidence). No data on health-related quality of life or socioeconomic effects were reported in the included studies.
Authors' conclusions
The body of evidence on TT compared with ST is limited. Goiter recurrence is reduced following TT. The effects on other key outcomes such as re-interventions due to goitre recurrence, adverse events and thyroid cancer incidence are uncertain. New long-term RCTs with additional data such as surgeons level of experience, treatment volume of surgical centres and details on techniques used are needed
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