Major suggestions of this study include the following: (a) hospitals should ensure set standard operating procedures for the OR, strengthen the designed-in security of the OR working environment, and provide adequate safety protection equipment to safeguard OR staff and patients; (b) the OR department should increase the quantity and the quality of stress relief courses; (c) the OR department should improve the OR environment and the administrative management skills; and (d) the OR department should offer self-esteem-related training programs to assist OR nursing staff to adopt constructive stress coping strategies.
Measurement of the cross section ratio σ ttbb /σ ttjj in pp collisions at √ s = 8 TeV .CMS Collaboration CERN, Switzerland a r t i c l e i n f o a b s t r a c t The first measurement of the cross section ratio σ ttbb /σ ttjj is presented using a data sample corresponding to an integrated luminosity of 19.6 fb −1 collected in pp collisions at √ s = 8 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum p T of both 20 and 40 GeV/c. The measured ratio is 0.022 ± 0.003 (stat) ± 0.005 (syst) for p T > 20 GeV/c.The absolute cross sections σ ttbb and σ ttjj are also measured. The measured ratio for p T > 40 GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.
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