Zobrazeno 1 - 10
of 332
pro vyhledávání: '"Pal, P. S."'
Autor:
Pal, Anshuman S.
In [Pal et al., arXiv:2206.03552], the authors discuss how an unsupported flat annulus contracted at its inner boundary by a factor $\Delta$, buckles into a radial wrinkling pattern that is fully isometric and tension-free. What selects the wavelengt
Externí odkaz:
http://arxiv.org/abs/2211.12736
Single-mode deformations of two-dimensional materials, such as the Miura-ori zig-zag fold, are important to the design of deployable structures because of their robustness; these usually require careful pre-patterning of the material. Here we show th
Externí odkaz:
http://arxiv.org/abs/2206.03552
Autor:
Verma, Meetu, Matijevič, Gal, Denker, Carsten, Diercke, Andrea, Dineva, Ekaterina, Balthasar, Horst, Kamlah, Robert, Kontogiannis, Ioannis, Kuckein, Christoph, Pal, Partha S.
The H{\alpha} spectral line is a well-studied absorption line revealing properties of the highly structured and dynamic solar chromosphere. Typical features with distinct spectral signatures in H{\alpha} include filaments and prominences, bright acti
Externí odkaz:
http://arxiv.org/abs/2011.13214
We present solar full-disk observations, which were recorded at the Einstein Tower during the years 1943 - 1991 (Solar Cycles 18 - 22). High-school students from Potsdam and Berlin digitized more than 3500 full-disk images during two- to three-week i
Externí odkaz:
http://arxiv.org/abs/2007.14744
Autor:
Verma, M., Denker, C., Diercke, A., Kuckein, C., Balthasar, H., Dineva, E., Kontogiannis, I., Pal, P. S., Sobotka, M.
Publikováno v:
A&A 639, A19 (2020)
High-spectral resolution observations using the VTT echelle spectrograph in the chromospheric H$\alpha$ line were obtained in the early growth phase of active region NOAA 12722. Noise-stripped H$\alpha$ line profiles yield maps of line-core and bisec
Externí odkaz:
http://arxiv.org/abs/2005.03966
Publikováno v:
Journal of Non-Equilibrium Thermodynamics, 45, 305 (2020)
Despite its idealizations, thermodynamics has proven its power as a predictive theory for practical applications. In particular, the Curzon-Ahlborn efficiency provides a benchmark for any real engine operating at maximal power. Here we further develo
Externí odkaz:
http://arxiv.org/abs/2003.11093
Autor:
Pal, P. S., Deffner, Sebastian
Publikováno v:
New J. Phys. 22, 073054 (2020)
Physical scenarios that require a relativistic treatment are ubiquitous in nature, ranging from cosmological objects to charge carriers in Dirac materials. Interestingly all of these situations have in common that the systems typically operate very f
Externí odkaz:
http://arxiv.org/abs/2003.02136
Autor:
Tam, P. H. T., Pal, P. S., Cui, Y. D., Jiang, N., Sotnikova, Y., Yang, C. W., Wang, L. Z., Tang, B. T., Li, Y. B., Mao, J., Kong, A. K. H., Zhong, Z. H., Ding, J., Mufakharov, T., Fan, J. F., Dou, L. M., Shen, R. F., Ai, Y. L.
Publikováno v:
Journal of High Energy Astrophysics 26C (2020) pp. 45-57
We report observations of a transient source \fermi\ from radio to \grs. \fermi\ was discovered by the {\it Fermi-LAT} in May 2017. Follow-up {\it Swift-XRT} observations revealed three flaring episodes through March 2018, and the peak X-ray flux is
Externí odkaz:
http://arxiv.org/abs/2001.11772
Autor:
Tam, Pak-Hin Thomas, Lee, K. K., Cui, Yudong, Kong, A. K. H., Li, K. L., Tudor, Vlad, He, Xinbo, Hu, C. P., Pal, Partha S.
We investigate the nature of the unidentified very-high-energy (VHE) gamma-ray object, HESS J1832-093, in a multi-wavelength context. Based on X-ray variability and spectral index ($\Gamma_X\sim\,1.5$), and its broad-band spectrum (which was remarkab
Externí odkaz:
http://arxiv.org/abs/2001.07138
Publikováno v:
Phys. Rev. E 101, 032109 (2020)
The topic of microscopic heat engine has undergone intensive research in recent years. Microscopic heat engines can exploit thermal as well as active fluctuations to extract thermodynamic work. We investigate the properties of a microscopic Stirling'
Externí odkaz:
http://arxiv.org/abs/1912.00585