EuFe2_2As2_2 under high pressure: an antiferromagnetic bulk superconductor

We report the ac magnetic susceptibility $\chi_{ac}$ and resistivity $\rho$ measurements of EuFe$_2$As$_2$ under high pressure $P$. By observing nearly 100% superconducting shielding and zero resistivity at $P$ = 28 kbar, we establish that $P$-induced superconductivity occurs at $T_c \sim$~30 K in EuFe$_2$As$_2$. $\rho$ shows an anomalous nearly linear temperature dependence from room temperature down to $T_c$ at the same $P$. $\chi_{ac}$ indicates that an antiferromagnetic order of Eu$^{2+}$ moments with $T_N \sim$~20 K persists in the superconducting phase. The temperature dependence of the upper critical field is also determined.Comment: To appear in J. Phys. Soc. Jpn., Vol. 78 No.

Highly-parallelized simulation of a pixelated LArTPC on a GPU

The rapid development of general-purpose computing on graphics processing units (GPGPU) is allowing the implementation of highly-parallelized Monte Carlo simulation chains for particle physics experiments. This technique is particularly suitable for the simulation of a pixelated charge readout for time projection chambers, given the large number of channels that this technology employs. Here we present the first implementation of a full microphysical simulator of a liquid argon time projection chamber (LArTPC) equipped with light readout and pixelated charge readout, developed for the DUNE Near Detector. The software is implemented with an end-to-end set of GPU-optimized algorithms. The algorithms have been written in Python and translated into CUDA kernels using Numba, a just-in-time compiler for a subset of Python and NumPy instructions. The GPU implementation achieves a speed up of four orders of magnitude compared with the equivalent CPU version. The simulation of the current induced on 10^3 pixels takes around 1 ms on the GPU, compared with approximately 10 s on the CPU. The results of the simulation are compared against data from a pixel-readout LArTPC prototype

Eyelid Tumors: A Potpourri of Three Cases

The eyelid is one of the most common sites for non-melanocytic skin tumors like basal cell carcinoma, squamous cell carcinoma and various skin adnexal tumors. of these, squamous cell carcinoma and basal cell carcinoma comprise 90% of all the eyelid tumors worldwide.The authors present three cases, which all presented with a mass in the eyelid.Case 1-A 70-year-old female presented with mass in the upper eyelid since 9 months.Case 2-A 65-year-old female presented with an ulcero-infiltrative nodule in the upper eyelid since 5 years with gradual increase in size since 5 months.Case 3-A 50-year-old male presented with an erythematous nodule in the upper eyelid since 1 year.Results: Based on the histopathological findings, diagnosis of sebaceous cell carcinoma, basal cell carcinoma, and squamous cell carcinoma was given.Discussion: Among the eyelid tumors in India, basal cell carcinoma is the most common with almost equal incidence closely followed by squamous cell carcinoma. Of the two, basal cell carcinoma has a better prognosis and sebaceous gland carcinoma has a higher mortality and therefore should be treated much more aggressively