AN IMPROVED ECG SIGNAL ACQUISITION SYSTEM THROUGH CMOS TECHNOLOGY

Abstract: This paper presents the design and realization of low power, high gain PC based system for ECG and data acquisition of a patient's heart condition. The advantage of this system is the use of standard CMOS process which will reduce the complexity and cost of the manufacturer. The system consists of three subsystemsOperational Amplifier based Pre-amplifier, ADC and USB interface device. High gain around 85 dB, low power dissipation of typically 0.683 mW and 61.5 degree phase-margin for stable closed loop operations were achieved. All design and simulation were done using Tanner Tool 0.5 μm technology

Unicystic Ameloblastoma in Anterior Maxilla - A Rare Case

Abstract: Unicystic ameloblastoma refers to those cystic lesions that show clinical, radiographic or gross features of a mandibular cyst, but on histologic examination show a typical ameloblastomatous epithelium lining part of the cyst cavity with or without luminal and/or mural tumor growth. They believed to be less aggressive and respond more favorably to conservative excision than the solid or multicystic ameloblastomas. We report a case of unicystic ameloblastoma of the anterior part of the maxilla that was treated by enucleation and use of Cornoy's solution under suspicion of lateral periodontal cyst. The nature of the lesion became evident only when the enucleated material was available for histologic examination

Laparoscopic treatment of annular pancreas in a neonate

Introduction: Duodenal obstruction due to annular pancreas is a rare entity. Among the causes of neonatal obstruction described by Robert Gross, annular pancreas comprises less than 1% of total group (Gross and Chisholm, 1944) [1]. Herewith, we present a case of annular pancreas causing duodenal obstruction in a neonate for which we performed laparoscopic duodeno-jejunostomy and placed a trans anastomotic naso-jejunal feeding tube. Technique description: A 2-day old neonate presented with complaints of bilious vomiting since birth. Clinical findings and radiological imaging were suggestive of duodenal obstruction. The patient was planned for diagnostic laparoscopy. Intraoperatively, a large annular pancreas was noted to obstruct the second part of duodenum. Duodeno-jejunal anastomosis was performed using polydioxanone 5-0 in a single layer. After completion of the posterior layer, a 6Fr infant feeding tube was placed trans anastomotic reaching mid jejunum. The patient tolerated the procedure well and feeds were started on POD 2 via the naso-jejunal trans-anastomotic tube. Conclusion: Laparoscopic duodeno-jejunostomy with the placement of a trans-anastomotic tube is beneficial for the patient as feeds can be started within 48 hours or even earlier. Moreover, laparoscopic approach increases precision in dissection due to greater magnification, decreases overall morbidity and improves cosmesis. Laparoscopic duodeno-jejunostomy, though technically challenging, is feasible in the neonatal age group

Pseudorapidity densities of charged particles with transverse momentum thresholds in pp collisions at √ s = 5.02 and 13 TeV

The pseudorapidity density of charged particles with minimum transverse momentum (pT) thresholds of 0.15, 0.5, 1, and 2 GeV/c is measured in pp collisions at the center of mass energies of √s=5.02 and 13 TeV with the ALICE detector. The study is carried out for inelastic collisions with at least one primary charged particle having a pseudorapidity (η) within 0.8pT larger than the corresponding threshold. In addition, measurements without pT-thresholds are performed for inelastic and nonsingle-diffractive events as well as for inelastic events with at least one charged particle having |η|2GeV/c), highlighting the importance of such measurements for tuning event generators. The new measurements agree within uncertainties with results from the ATLAS and CMS experiments obtained at √s=13TeV.

Λc+\Lambda^+_c production in pppp and in pp-Pb collisions at sNN\sqrt {s_{NN}}=5.02 TeV

International audienceThe production cross section of prompt $\mathrm{\Lambda_{c}^{+}}$ charm baryons was measured with the ALICE detector at the LHC at midrapidity in proton-proton (pp) and proton-lead (p-Pb) collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}} = 5.02$ TeV. The $\mathrm{\Lambda_{c}^{+}}$ and $\rm {\overline{\Lambda}{}_c^-}$ baryons were reconstructed in the hadronic decay channels $\rm \Lambda_{c}^{+} \rightarrow p K^{-}\pi^{+}$ and $\rm \Lambda_{c}^{+}\to p K^{0}_{S}$ and respective charge conjugates. The measured differential cross sections as a function of transverse momentum ($p_{\rm T}$) and the $p_{\rm T}$-integrated $\mathrm{\Lambda_{c}^{+}}$ production cross section in pp and in p-Pb collisions are presented. The $\mathrm{\Lambda_{c}^{+}}$ nuclear modification factor ($R_\mathrm{pPb}$), calculated from the cross sections in pp and in p-Pb collisions, is presented and compared with the $R_\mathrm{pPb}$ of D mesons. The $\mathrm {\Lambda_{c}^{+}}/\mathrm {D^0}$ ratio is also presented and compared with the light-flavour baryon-to-meson ratios p$/\pi$ and $\Lambda /\mathrm {K^0_S}$, and measurements from other LHC experiments. The results are compared to predictions from model calculations and Monte Carlo event generators

Global polarization of Λ and Λ hyperons in Pb-Pb collisions at √ s N N = 2.76 and 5.02 TeV

The global polarization of Λ and Λ hyperons is measured for Pb-Pb collisions at √sNN = 2.76 and 5.02 TeV recorded with the ALICE at the Large Hadron Collider (LHC). The results are reported differentially as a function of collision centrality and hyperon’s transverse momentum (pT ) for the range of centrality 5–50%, 0.5 < pT < 5 GeV/c, and rapidity |y| < 0.5. The hyperon global polarization averaged for Pb-Pb collisions at √sNN = 2.76 and 5.02 TeV is found to be consistent with zero, ⟨PH⟩(%)≈0.01±0.06(stat.)±0.03(syst.) in the collision centrality range 15–50%, where the largest signal is expected. The results are compatible with expectations based on an extrapolation from measurements at lower collision energies at the Relativistic Heavy Ion Collider, hydrodynamical model calculations, and empirical estimates based on collision energy dependence of directed flow, all of which predict the global polarization values at LHC energies of the order of 0.01%

Charged-particle multiplicity fluctuations in Pb–Pb collisions at √ sNN = 2.76 TeV

Measurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisionsat √sNN = 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < pT < 2.0 GeV/c. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The η and pT dependences of the fluctuations and their evolution with respect to collision centrality are investigated. The multiplicity fluctuations tend to decrease from peripheral to central collisions. The results are compared to those obtained from HIJING and AMPT Monte Carlo event generators as well as to experimental data at lower collision energies. Additionally, the measured multiplicity fluctuations are discussed in the context of the isothermal compressibility of the high-density strongly-interacting system formed in central Pb–Pb collisions

First measurements of N-subjettiness in central Pb–Pb collisions at √ sNN = 2.76 TeV

The ALICE Collaboration reports the first fully-corrected measurements of the N-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and Pb–Pb collisions at centre-of-mass energies of √s = 7 TeV and √ sNN = 2.76 TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, τ2/τ1, which is sensitive to the rate of two-pronged jet substructure, is presented. Energy loss of jets traversing the strongly interacting medium in heavy-ion collisions is expected to change the rate of two-pronged substructure relative to vacuum. The results are presented for jets with a resolution parameter of R = 0.4 and charged jet transverse momentum of 40 ≤ pT,jet ≤ 60 GeV/c, which constitute a larger jet resolution and lower jet transverse momentum interval than previous measurements in heavy-ion collisions. This has been achieved by utilising a semi-inclusive hadron-jet coincidence technique to suppress the larger jet combinatorial background in this kinematic region. No significant modification of the τ2/τ1 observable for track-based jets in Pb–Pb collisions is observed relative to vacuum PYTHIA6 and PYTHIA8 references at the same collision energy. The measurements of τ2/τ1, together with the splitting aperture angle ∆R, are also performed in pp collisions at √s = 7 TeV for inclusive jets. These results are compared with PYTHIA calculations at √s = 7 TeV, in order to validate the model as a vacuum reference for the Pb–Pb centre-of-mass energy. The PYTHIA references for τ2/τ1 are shifted to larger values compared to the measurement in pp collisions. This hints at a reduction in the rate of two-pronged jets in Pb–Pb collisions compared to pp collisions