Recent studies have suggested higher complication and conversion to open rates for nighttime laparoscopic cholecystectomy (LC) and recommend against the practice. We hypothesize that patients ...undergoing night LC for acute cholecystitis have decreased hospital length of stay and cost with no difference in complication and conversion rates.
A retrospective review of patients with acute cholecystitis who underwent LC from October 2011 through June 2015 was performed. Complication rates, length of stay, and cost of hospitalization were compared between patients undergoing day cholecystectomy and night cholecystectomy.
Complication rates and costs did not differ between the day and night groups. Length of stay was shorter in the night group (2.4 vs 2.8 days, p = 0.002).
Performing LC for acute cholecystitis during night-time hours does not increase risk of complications and decreases length of stay.
Tagging highly boosted top quarks Schätzel, S.; Spannowsky, M.
Physical review. D, Particles, fields, gravitation, and cosmology,
01/2014, Letnik:
89, Številka:
1
Journal Article
Recenzirano
Odprti dostop
For highly energetic top quarks, the products of the decay t arrow right bqq' are collimated. The three-prong decay structure can no longer be resolved using calorimeter information alone if the ...particle jet separation approaches the calorimeter granularity. We propose a new method, the HPTTopTagger, that uses tracks of charged particles inside a fat jet to find top quarks with transverse momentum pT> 1 TeV. The tracking information is complemented by the calorimeter measurement of the fat jet energy to eliminate the sensitivity to jet-to-jet fluctuations in the charged-to-neutral particle ratio. We show that with the HPTTopTagger, a leptophobic narrow-mass Z' boson of mass 3 TeV could be found using 300 fb super(-1) of 14 TeV LHC data.
...I'll always remember in early 1990s Southern Surgical Association meeting when Bill Meyers presented a paper on mechanisms of lap chole bile duct injuries. About a decade later, Larry Way ...presented a landmark paper to the American Surgical entitled Causes of Laparoscopic Bile Duct Injuries. In other words, the eye is not a camera; it's a complex psychological instrument constantly interpreting visual stimuli and dependent on behavioral factors like fatigue and sleep deprivation. The authors thoughtfully suggest that subjective selection bias by the operating team could not be quantified which could explain why all the mortalities and common bile duct injuries occurred during the daytime. First of all, I applaud your outcome because that means you do have competent acute care surgeons that actually can take the gallbladder out at night.
ATLAS offline data quality monitoring Adelman, J; Baak, M; Boelaert, N ...
Journal of physics. Conference series,
04/2010, Letnik:
219, Številka:
4
Journal Article
Recenzirano
Odprti dostop
The ATLAS experiment at the Large Hadron Collider reads out 100 Million electronic channels at a rate of 200 Hz. Before the data are shipped to storage and analysis centres across the world, they ...have to be checked to be free from irregularities which render them scientifically useless. Data quality offline monitoring provides prompt feedback from full first-pass event reconstruction at the Tier-0 computing centre and can unveil problems in the detector hardware and in the data processing chain. Detector information and reconstructed proton-proton collision event characteristics are distilled into a few key histograms and numbers which are automatically compared with a reference. The results of the comparisons are saved as status flags in a database and are published together with the histograms on a web server. They are inspected by a 24/7 shift crew who can notify on-call experts in case of problems and in extreme cases signal data taking abort.
This report of the BOOST2012 workshop presents the results of four working groups that studied key aspects of jet substructure. We discuss the potential of first-principle QCD calculations to yield a ...precise description of the substructure of jets and study the accuracy of state-of-the-art Monte Carlo tools. Limitations of the experiments’ ability to resolve substructure are evaluated, with a focus on the impact of additional (pile-up) proton proton collisions on jet substructure performance in future LHC operating scenarios. A final section summarizes the lessons learnt from jet substructure analyses in searches for new physics in the production of boosted top quarks.
At the ATLAS experiment, the Detector Control System (DCS) is used to oversee detector conditions and supervise the running of equipment. It is essential that information from the DCS about the ...status of individual sub-detectors be extracted and taken into account when determining the quality of data taken and its suitability for different analyses. DCS information is written to the ATLAS conditions database and then summarised to provide a status flag for each sub-detector and displayed on the web. We discuss how this DCS information should be used, and the technicalities of making this summary.
The purpose of this study was to investigate the modifications of muscle protein synthesis activity in uremic patients fed a low-protein diet and a low-protein diet supplemented with a keto ...acid-amino acid mixture. The protein synthesis activity was evaluated in vitro on isolated muscle ribosomes incubated in a cell-free medium with tritiated leucine. Simultaneously, nitrogen kinetics and amino acid patterns were examined. Protein synthesis activity is correlated with the protein content of the diet in uremic patients. The keto acid-amino acid supplementation enhances protein synthesis. Variations of protein synthesis can be correlated with the variations of nitrogen balance which implies a major role of protein synthesis activity in muscle protein metabolism. Variations in plasma levels of the essential amino acids, mainly leucine and valine, can be correlated with the variations of protein synthesis activity, and these amino acids seem therefore to be mediators of the dietary effects on protein synthesis in uremia.
The Photon in Diffraction at HERA Schätzel, S.
Nuclear physics. Section B, Proceedings supplement,
11/2008, Letnik:
184
Journal Article
The universality of the diffractive proton structure is investigated at HERA using structure function measurements in diffractive deep-inelastic scattering (DIS) and diffractive jet and charm ...production in DIS and photoproduction. While all point-like photon scattering processes can be described using the same parton densities (factorisation), the situation is different in real photon scattering where the diffractive dijet cross section measured by H1 for
E
T
jet
(
1
,
2
)
>
5
,
4
GeV
is a factor of approximately 0.5 lower than expectations based on the DIS parton densities (factorisation breaking). Strikingly, the suppression factor (or ‘gap survival probability’) is independent of the photon energy that manifests itself outside the jet system—direct and resolved photon processes are equally suppressed. This can be understood qualitatively in the dipole picture. A reduced suppression with respect to theoretical predictions is found in a ZEUS analysis of diffractive photoproduction of dijets with higher transverse momenta
(
E
T
jet
(
1
,
2
)
>
7.5
,
6.5
GeV
)
.
This report of the BOOST2012 workshop presents the results of four working groups that studied key aspects of jet substructure. We discuss the potential of the description of jet substructure in ...first-principle QCD calculations and study the accuracy of state-of-the-art Monte Carlo tools. Experimental limitations of the ability to resolve substructure are evaluated, with a focus on the impact of additional proton proton collisions on jet substructure performance in future LHC operating scenarios. A final section summarizes the lessons learnt during the deployment of substructure analyses in searches for new physics in the production of boosted top quarks.
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