Modeling the Subsurface Structure of Sunspots

While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface structure of sunspots: the monolithic model and the cluster model. Local helioseismology is the only means by which we can investigate subphotospheric structure. However, as current linear inversion techniques do not yet allow helioseismology to probe the internal structure with sufficient confidence to distinguish between the monolith and cluster models, the development of physically realistic sunspot models are a priority for helioseismologists. This is because they are not only important indicators of the variety of physical effects that may influence helioseismic inferences in active regions, but they also enable detailed assessments of the validity of helioseismic interpretations through numerical forward modeling. In this paper, we provide a critical review of the existing sunspot models and an overview of numerical methods employed to model wave propagation through model sunspots. We then carry out an helioseismic analysis of the sunspot in Active Region 9787 and address the serious inconsistencies uncovered by \citeauthor{gizonetal2009}~(\citeyear{gizonetal2009,gizonetal2009a}). We find that this sunspot is most probably associated with a shallow, positive wave-speed perturbation (unlike the traditional two-layer model) and that travel-time measurements are consistent with a horizontal outflow in the surrounding moat.Comment: 73 pages, 19 figures, accepted by Solar Physic

Linking Distributive and Procedural Justice to Employee Engagement Through Social Exchange: A Field Study in India

Research linking justice perceptions to employee outcomes has referred to social exchange as its central theoretical premise. We tested a conceptual model linking distributive and procedural justice to employee engagement through social exchange mediators, namely, perceived organizational support and psychological contract, among 238 managers and executives from manufacturing and service sector firms in India. Findings suggest that perceived organizational support mediated the relationship between distributive justice and employee engagement, and both perceived organizational support and psychological contract mediated the relationship between procedural justice and employee engagement. Theoretical and practical implications with respect to organizational functions are discussed

First measurement of Ωc0 production in pp collisions at s=13 TeV

The inclusive production of the charm–strange baryon 0 c is measured for the first time via its hadronic √ decay into −π+ at midrapidity (|y| <0.5) in proton–proton (pp) collisions at the centre-of-mass energy s =13 TeV with the ALICE detector at the LHC. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 2 < pT < 12 GeV/c. The pT dependence of the 0 c-baryon production relative to the prompt D0-meson and to the prompt 0 c-baryon production is compared to various models that take different hadronisation mechanisms into consideration. In the measured pT interval, the ratio of the pT-integrated cross sections of 0 c and prompt + c baryons multiplied by the −π+ branching ratio is found to be larger by a factor of about 20 with a significance of about 4σ when compared to e+e− collisions

Elliptic flow of charged particles at midrapidity relative to the spectator plane in Pb–Pb and Xe–Xe collisions

Measurements of the elliptic flow coefficient relative to the collision plane defined by the spectator neutrons v2{ SP} in collisions of Pb ions at center-of-mass energy per nucleon–nucleon pair √ 2.76 TeV and Xe ions at √ sNN = sNN =5.44 TeV are reported. The results are presented for charged particles produced at midrapidity as a function of centrality and transverse momentum for the 5–70% and 0.2–6 GeV/c ranges, respectively. The ratio between v2{ SP} and the elliptic flow coefficient relative to the participant plane v2{4}, estimated using four-particle correlations, deviates by up to 20% from unity depending on centrality. This observation differs strongly from the magnitude of the corresponding eccentricity ratios predicted by the TRENTo and the elliptic power models of initial state fluctuations that are tuned to describe the participant plane anisotropies. The differences can be interpreted as a decorrelation of the neutron spectator plane and the reaction plane because of fragmentation of the remnants from the colliding nuclei, which points to an incompleteness of current models describing the initial state fluctuations. A significant transverse momentum dependence of the ratio v2{ SP}/v2{4} is observed in all but the most central collisions, which may help to understand whether momentum anisotropies at low and intermediate transverse momentum have a common origin in initial state f luctuations. The ratios of v2{ SP} and v2{4} to the corresponding initial state eccentricities for Xe–Xe and Pb–Pb collisions at similar initial entropy density show a difference of (7.0 ±0.9)%with an additional variation of +1.8% when including RHIC data in the TRENTo parameter extraction. These observations provide new experimental constraints for viscous effects in the hydrodynamic modeling of the expanding quark–gluon plasma produced in heavy-ion collisions at the LHC

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Not AvailableThe present investigation was carried out during 2016-2017 to delineate the best performing combinational doses of NPK on two cauliflower varieties (Pusa Snowball K-1 and Pusa Himjyoti). Four different combinations of NPK kg ha-1, viz. T0 = 0:0:0, T1 = 80:30:60, T2 = 120:60:80 and T3 = 150:70:100 NPK with three replications using two-way factorial analysis. Results revealed that NPK application of 120:60:80 kg ha-1 was found to be performing better for yield contributing characters of cauliflower var. Pusa Snowball K-1 with maximum plant weight (1.50 kg/ plant), net curd weight (659 g/ plant), curd diameter (13.33 cm), curd height (10.12 cm), stalk length (3.25 cm) and curd yield per plot (14.29 kg/plot), whereas, treatment T3, when applied on Pusa Snowball K-1 resulted in better growth in terms of plant height (37.16 cm), plant spread (47.23 cm) and number of leaves (14.93). The study also revealed that ascorbic acid as well as β-carotene contents in curds showed a decreasing trend with increasing level of NPK inputs irrespective of variety. Under Western plain zones of Uttar Pradesh better performance of Pusa Snowball K-1 with NPK application of 120:60:80 kg ha-1 could be suitable combination for cauliflower cultivationNot Availabl

Quantitative polymerase chain reaction based quantification of Brucella DNA in serum of pre- and post-therapeutic occupationally exposed infected human population

Background: Brucellosis is one of the neglected zoonotic diseases in humans. The serological methods based on antibody detections are unable to detect the effectiveness of treatment in humans as antibodies persist for long time in humans even after therapy. Therefore, we developed qPCR technique to overcome such discrepancy and device a rapid and efficient test for both diagnosis and follow up of the brucellosis affected individuals. Methods: High risk suspected individuals with positive serology (RBPT, STAT and iELISA) and PCR were mainly analyzed for DNA quantification by qPCR assay. The bcsp-31 gene, a shared gene of Brucella species was amplified by genus specific primers and cloned to pGEMT™ easy vector and the cloned plasmid were used to construct a standard curve (R2 = 0.99, efficiency = 1.98) over 7 orders of magnitude with sensitivity of ≈10 copy number. The assay was found 100% specific. Results: Overall 85 individuals were found positive out of 188. Out of them, 23 serological, PCR and qPCR positive individuals were recommended for 45 days therapy according to WHO regimen (Doxycycline and Rifampin) and each case was further followed by qPCR. The mean threshold cycle (Cq) before treatment was 26.05 ± 0.347 (3940.5 copies/μl), which increased significantly to 32.7 ± 0.66 (259.13 copies/μl) on 4th week during treatment, 35.12 ± 3.12 (38.52 copies/μl) at 6th week on day of treatment completion, 35.6 ± 0.66 (34.21 copies/μl) on 21st day after treatment depicting a significant reduction in DNA load over the course of treatment. Serological follow up showed that only 3 individuals had decreased STAT titre but no change in RBPT results. Out of 17 symptomatic individuals under therapy, 10 improved clinically, 5 improved clinically with persistent weakness and 2 had no effect of therapy. Conclusion: The study suggests that qPCR is more useful and rapid test to follow treated individuals than serology. Keywords: Brucella, qPCR, Cq value, High-risk individuals, Copy numbe