Innovative hemodialysis systems are designed to ensure user safety and reduce operational time to allow health-care personnel to focus on patient care. The 6008 CareSystem has been developed to ...simplify the extracorporeal circuit of the system through a disposable cassette, automate operation steps, and facilitate handling in comparison to its predecessor - the 5008 CorDiax. The present investigations were performed with the aim of evaluating usability, safety, and ergonomic aspects of the new therapy system.
A time-motion study compared these two hemodialysis systems with video and time recording of handling steps required to prepare, operate, and dismantle a dialysis machine. The ergonomic burden on hands and finger joints was evaluated in a second study, again by video-recording the simulated operation of both dialysis systems.
The number of handling steps required for the 6008 CareSystem and critical contact points were reduced by 26% in comparison to the 5008 CorDiax for patients with arteriovenous fistula used for vascular access and by 22% for those with a catheter used for vascular access. Total process time was reduced by 2.83 and 2.57 minutes using fistulae and catheters for vascular access, respectively. The number of hand grips and finger and thumb presses was reduced by approximately 50% and required less strength to execute.
The most recent hemodialysis system confirmed its ease of use and user safety through fewer handling steps and less physical burden on the user. Shorter operational time should enable more patient-focused care.
We report on a search for narrow-width particles decaying to a top and antitop quark pair. The data set used in the analysis corresponds to an integrated luminosity of 680 pb{sup -1} collected with ...the Collider Detector at Fermilab in run II. We present 95% confidence level upper limits on the cross section times branching ratio. Assuming a specific top-color-assisted technicolor production model, the leptophobic Z{sup '} with width {gamma}{sub Z{sup '}}=0.012M{sub Z{sup '}}, we exclude the mass range M{sub Z{sup '}}<725 GeV/c{sup 2} at the 95% confidence level.
We measure the mean lifetime {tau}=2/({gamma}{sub L}+{gamma}{sub H}) and the decay-width difference {delta}{gamma}={gamma}{sub L}-{gamma}{sub H} of the light and heavy mass eigenstates of the B{sub ...s}{sup 0} meson, B{sub sL}{sup 0} and B{sub sH}{sup 0}, in B{sub s}{sup 0}{yields}J/{psi}{phi} decays using 1.7 fb{sup -1} of data collected with the CDF II detector at the Fermilab Tevatron pp collider. Assuming CP conservation, a good approximation for the B{sub s}{sup 0} system in the standard model, we obtain {delta}{gamma}=0.076{sub -0.063}{sup +0.059}(stat){+-}0.006(syst) ps{sup -1} and {tau}=1.52{+-}0.04(stat){+-}0.02(syst) ps, the most precise measurements to date. Our constraints on the weak phase and {delta}{gamma} are consistent with CP conservation.
We have searched for exclusive {gamma}{gamma} production in proton-antiproton collisions at {radical}(s)=1.96 TeV, using 532 pb{sup -1} of integrated luminosity taken by the run II Collider Detector ...at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy E{sub T}>5 GeV and pseudorapidity |{eta}|<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with {gamma}{gamma}, {pi}{sup 0}{pi}{sup 0}, or {eta}{eta} production. The probability that other processes fluctuate to {>=}3 events is 1.7x10{sup -4}. An upper limit on the cross section of pp{yields}p+{gamma}{gamma}+p production is set at 410 fb with 95% confidence level.
We report an observation of new bottom baryons produced in pp collisions at the Tevatron. Using 1.1 fb{sup -1} of data collected by the CDF II detector, we observe four {lambda}{sub b}{sup 0}{pi}{sup ...{+-}} resonances in the fully reconstructed decay mode {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -}, where {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +}. We interpret these states as the {sigma}{sub b}{sup (*){+-}} baryons and measure the following masses: m{sub {sigma}{sub b}{sup +}}=5807.8{sub -2.2}{sup +2.0}(stat.){+-}1.7(syst.) MeV/c{sup 2}, m{sub {sigma}{sub b}{sup -}}=5815.2{+-}1.0(stat.){+-}1.7(syst.) MeV/c{sup 2}, and m({sigma}{sub b}*)-m({sigma}{sub b})=21.2{sub -1.9}{sup +2.0}(stat.){sub -0.3}{sup +0.4}(syst.) MeV/c{sup 2}.
We present a search for associated production of the chargino and neutralino supersymmetric particles using up to 1.1 fb{sup -1} of integrated luminosity collected by the CDF II experiment at the ...Tevatron pp collider at {radical}(s)=1.96 TeV. We analyze events with a large transverse momentum imbalance and either three charged leptons or two charged leptons of the same electric charge. The numbers of observed events are consistent with standard model expectations. Upper limits on the production cross section are derived in different theoretical models.
We report the results of a search for a narrow resonance in electron-positron events in the invariant mass range of 150-950 GeV/c{sup 2} using 1.3 fb{sup -1} of pp collision data at {radical}(s)=1.96 ...TeV collected by the CDF II detector at Fermilab. No significant evidence of such a resonance is observed and we interpret the results to exclude the standard-model-like Z{sup '} with a mass below 923 GeV/c{sup 2} and the Randall-Sundrum graviton with a mass below 807 GeV/c{sup 2} for k/M{sub pl}=0.1, both at the 95% confidence level. Combining with diphoton data excludes the Randall-Sundrum graviton for masses below 889 GeV/c{sup 2} for k/M{sub pl}=0.1.
We have measured the polarizations of J/{psi} and {psi}(2S) mesons as functions of their transverse momentum p{sub T} when they are produced promptly in the rapidity range |y|<0.6 with p{sub T}{>=}5 ...GeV/c. The analysis is performed using a data sample with an integrated luminosity of about 800 pb{sup -1} collected by the CDF II detector. For both vector mesons, we find that the polarizations become increasingly longitudinal as p{sub T} increases from 5 to 30 GeV/c. These results are compared to the predictions of nonrelativistic quantum chromodynamics and other contemporary models. The effective polarizations of J/{psi} and {psi}(2S) mesons from B-hadron decays are also reported.
We report the observation and measurement of the mass of the bottom, strange baryon {xi}{sub b}{sup -} through the decay chain {xi}{sub b}{sup -}{yields}J/{psi}{xi}{sup -}, where ...J/{psi}{yields}{mu}{sup +}{mu}{sup -}, {xi}{sup -}{yields}{lambda}{pi}{sup -}, and {lambda}{yields}p{pi}{sup -}. A signal is observed whose probability of arising from a background fluctuation is 6.6x10{sup -15}, or 7.7 Gaussian standard deviations. The {xi}{sub b}{sup -} mass is measured to be 5792.9{+-}2.5(stat) {+-}1.7(syst) MeV/c{sup 2}.
We present a measurement of {sigma}(pp{yields}W)xB(W{yields}e{nu}) at {radical}(s)=1.96 TeV, using electrons identified in the forward region (1.2< vertical bar {eta} vertical bar <2.8) of the CDF II ...detector, in 223 pb{sup -1} of data. We measure {sigma}xB=2796{+-}13(stat){sub -90}{sup +95}(syst){+-}162(lum) pb. Combining this result with a previous CDF measurement obtained using electrons in the central region ( vertical bar {eta} vertical bar < or approx. 1), we present the first measurement of the ratio of central-electron to forward-electron W partial cross sections R{sub exp}=0.925{+-}0.006(stat){+-}0.032(syst), consistent with theoretical predictions using Coordinated Theoretical-Experimental Project on QCD (CTEQ) and Martin-Roberts-Stirling-Thorne (MRST) parton distribution functions.
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