Influence of lithophysal geometry on uniaxial compression of tuff-like rock

The high-level nuclear waste repository at Yucca Mountain includes tuff containing lithophysae or natural voids. This study investigated the effect of voids (porosity, distribution, shape and size) on the mechanical properties of cubes of analog lithophysal tuff (HydroStoneTB). A systematic study was made using three different randomly generated patterns of voids varying in shape, size, and geometrical distribution over a void porosity range of 0 to 30%. Each specified void pattern was cast into 6 in. length cubes, in triplicate, and was tested under uniaxial compression to find uniaxial compressive strength (UCS) and Young\u27s Modulus (E); The results indicate that the UCS and E values decrease with increasing specimen void porosity. From solid specimens there is roughly an 80 percent drop in UCS and a 45 percent drop in E at about 20 percent void porosity. Shape and size of void has significant effect on UCS values, but not on E values. Comparing the three different geometrical patterns, no significant differences in properties resulted

Context sensitive computational mechanisms of decision-making

by Manisha ChawlaPh.D

Direct Benefit Transfer Scheme for Tuberculosis Patients – Performance Challenges observed by the Providers and Patients

Introduction: Government of India launched an Aadhar-linked Direct Benefit Transfer (DBT) scheme from 1st April, 2018. Under this scheme, all notified TB patients would receive Rs 500 per month (~US$7) throughout the course of their treatment for nutritional support. Aim and Objectives: To determine the challenges faced by the health providers and patients in the implementation of Direct Benefit Transfer scheme. Methods: This was a mixed method cross-sectional study conducted on all public and private TB patients notified during the year 2019 under RNTCP (now NTEP) in district Amritsar, Punjab. Quantitative data about the availability and validation of bank accounts was obtained from the Nikshay portal after having permission from the District TB Officer. Qualitative data was obtained from the focus group discussion and in-depth interviews with the involved staff members (17) and patients (20) registered in Tuberculin units of Amritsar. Results: From the Nikshay reports, it was observed that there was significant difference between the public and private sector and between rural and urban areas. Focus group discussion was done with the TB Health Visitor (TBHV) and Senior TB supervisors (STS) and asked about the hurdles they faced. Items were identified and tabulated. In-depth interviews were conducted on 20 patients, 10 each from public and private sector respectively. Data collected was transcribed and arranged as per the themes or questions and then the information was recorded under those sub-headings. Conclusion: The major challenges observed by the providers were lack of support from the private sector, lack of awareness among people, technical issues and more work burden. Patients mostly mentioned about confidentiality issues, lack of awareness, social stigma of the disease, less amount and long and complex process

Correlation of longitudinal changes that occur in fetal middle cerebral artery-peak systolic velocity with middle cerebral artery-pulsatility index in late onset intrauterine growth restriction cases

Background: Fetal blood flow can be studied by Doppler patterns which follow a longitudinal trend with sequential changes in umbilical artery, middle cerebral artery followed by other peripheral arteries. Though FGR cannot be treated but morbidity and mortality can be decreased by studying longitudinal changes in MCA-PI (middle cerebral artery-pulsatility index) and MCA-PSV (middle cerebral arterial-peak systolic velocity) and terminating the pregnancy at appropriate time.Methods: A prospective observational study was conducted from 2018 to 2019 on 29 antenatal patients with suspicion of fetal growth restriction at ≥32 weeks gestation. Patients with late onset FGR by Delphi procedure with singleton pregnancy and confirmed gestational age were included. Patients with gross congenital anomaly or multiple pregnancy were excluded. Peak systolic velocity, resistance index and PI in middle cerebral artery were recorded in absence of fetal movements. MCA-PSV >95th percentile and MCA-PI 0.05). The sensitivity of MCA-PSV fall in predicting the perinatal mortality was 80% and specificity was 91.76%.Conclusions: MCA-PSV not only complements MCA-PI but also provides more accurate information than does MCA-PI alone and should be used along with MCA-PI for optimizing fetomaternal outcome

Measurement of t(t)over-bar normalised multi-differential cross sections in pp collisions at root s=13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

Peer reviewe

Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at √s = 13 TeV

Abstract The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric (d̂ t) and chromomagnetic (μ̂ t) moments have been measured using LHC pp collisions at a center-of-mass energy of 13 TeV, collected in the CMS detector in a data sample corresponding to an integrated luminosity of 35.9 fb−1. The linearized variable AFB(1) is used to approximate the asymmetry. Candidate t t ¯ events decaying to a muon or electron and jets in final states with low and high Lorentz boosts are selected and reconstructed using a fit of the kinematic distributions of the decay products to those expected for t t ¯ final states. The values found for the parameters are AFB(1)=0.048−0.087+0.095(stat)−0.029+0.020(syst),μ̂t=−0.024−0.009+0.013(stat)−0.011+0.016(syst), and a limit is placed on the magnitude of | d̂ t| < 0.03 at 95% confidence level. [Figure not available: see fulltext.

MUSiC : a model-unspecific search for new physics in proton-proton collisions at root s=13TeV

Results of the Model Unspecific Search in CMS (MUSiC), using proton-proton collision data recorded at the LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb(-1), are presented. The MUSiC analysis searches for anomalies that could be signatures of physics beyond the standard model. The analysis is based on the comparison of observed data with the standard model prediction, as determined from simulation, in several hundred final states and multiple kinematic distributions. Events containing at least one electron or muon are classified based on their final state topology, and an automated search algorithm surveys the observed data for deviations from the prediction. The sensitivity of the search is validated using multiple methods. No significant deviations from the predictions have been observed. For a wide range of final state topologies, agreement is found between the data and the standard model simulation. This analysis complements dedicated search analyses by significantly expanding the range of final states covered using a model independent approach with the largest data set to date to probe phase space regions beyond the reach of previous general searches.Peer reviewe

Measurement of prompt open-charm production cross sections in proton-proton collisions at root s=13 TeV

The production cross sections for prompt open-charm mesons in proton-proton collisions at a center-of-mass energy of 13TeV are reported. The measurement is performed using a data sample collected by the CMS experiment corresponding to an integrated luminosity of 29 nb(-1). The differential production cross sections of the D*(+/-), D-+/-, and D-0 ((D) over bar (0)) mesons are presented in ranges of transverse momentum and pseudorapidity 4 < p(T) < 100 GeV and vertical bar eta vertical bar < 2.1, respectively. The results are compared to several theoretical calculations and to previous measurements.Peer reviewe

An embedding technique to determine ττ backgrounds in proton-proton collision data

An embedding technique is presented to estimate standard model tau tau backgrounds from data with minimal simulation input. In the data, the muons are removed from reconstructed mu mu events and replaced with simulated tau leptons with the same kinematic properties. In this way, a set of hybrid events is obtained that does not rely on simulation except for the decay of the tau leptons. The challenges in describing the underlying event or the production of associated jets in the simulation are avoided. The technique described in this paper was developed for CMS. Its validation and the inherent uncertainties are also discussed. The demonstration of the performance of the technique is based on a sample of proton-proton collisions collected by CMS in 2017 at root s = 13 TeV corresponding to an integrated luminosity of 41.5 fb(-1).Peer reviewe

Search for Physics beyond the Standard Model in Events with Overlapping Photons and Jets

Results are reported from a search for new particles that decay into a photon and two gluons, in events with jets. Novel jet substructure techniques are developed that allow photons to be identified in an environment densely populated with hadrons. The analyzed proton-proton collision data were collected by the CMS experiment at the LHC, in 2016 at root s = 13 TeV, and correspond to an integrated luminosity of 35.9 fb(-1). The spectra of total transverse hadronic energy of candidate events are examined for deviations from the standard model predictions. No statistically significant excess is observed over the expected background. The first cross section limits on new physics processes resulting in such events are set. The results are interpreted as upper limits on the rate of gluino pair production, utilizing a simplified stealth supersymmetry model. The excluded gluino masses extend up to 1.7 TeV, for a neutralino mass of 200 GeV and exceed previous mass constraints set by analyses targeting events with isolated photons.Peer reviewe