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The 2021 outburst of the symbiotic recurrent nova RS Oph was observed with the Chandra High Energy Transmission Gratings (HETG) on day 18 after optical maximum and with XMM-Newton and its Reflection Grating Spectrographs (RGS) on day 21, before the supersoft X-ray source emerged and when the emission was due to shocked ejecta. The absorbed flux in the HETG 1.3-31 Angstrom range was 2.6 x 10(-10) erg/cm(-2)/s, three orders of magnitude lower than the gamma-ray flux measured on the same date. The spectra are well fitted with two components of thermal plasma in collisional ionization equilibrium, one at a temperature ~0.75 keV, and the other at temperature in the 2.5-3.4 keV range. With the RGS we measured an average flux 1.53 x 10(-10) erg/cm(-2)/s in the 5-35 Angstrom range, but the flux in the continuum and especially in the lines in the 23-35 Angstrom range decreased during the 50 ks RGS exposure by almost 10%, indicating short term variability on hours' time scale. The RGS spectrum can be fitted with three thermal components, respectively at plasma temperature between 70 and 150 eV, 0.64 keV and 2.4 keV. The post-maximum epochs of the exposures fall between those of two grating spectra observed in the 2006 eruption on days 14 and 26: they are consistent with a similar spectral evolution, but in 2021 cooling seems to have been more rapid. Iron is depleted in the ejecta with respect to solar values, while nitrogen is enhanced., In press in the Astrophysical Journal

Smart Cities is venturing into reality as the center shifts from hypothesis to real advancement. Sustainable power sources like wind vitality, solar-powered vitality, hydrovitality, and warm vitality are the lights of future on the grounds that the customary sources like fossil, coal, and oil fills are constrained and are arriving at an end as a result of the expanding request. So as to fabricate savvy medical clinics, structures, plants, traffic, and transportations having a dependable, strong, effective, and smooth vitality stream critical. All these computerized administrations are foreseen to run without disturbances by the utilization of electrical control frameworks and keen vitality, which are viewed as the spines of such urban areas. So as to keep the shrewd city administrations interconnected and matched up, IoT assumes a key job. Through the span of this piece, we’ll go over the job of IoT and sustainable power sources. The usage of sustainable power source wouldn’t be so fruitful without IoT. In this review paper, we talked about a correlation between the a portion of the sustainable power sources, for example, solar oriented, wind, hydro, and warm vitality with Internet of Things (IoT).

The Internet of Things has a vision in which the web extends into this present reality which is followed by daily posts. The IoT allows articles to be detected or remotely controlled over existing system frameworks, opening doors for the unadulterated incorporation of the physical world into PC-based frameworks and providing improved efficiency, accuracy, and monetary advantage despite reduced human mediation. This breakthrough has various applications, such as urban communities focused on solar power, smart cities, micro matrices, and lights on Solar Road, etc. AI is when calculations decode gigantic knowledge arrangements to the PCs so that they can function without specific programming. This, for the most part, focuses on the development of different PC programs which may change when exposed to new information. During this period renewable vitality developed at a rate faster than some other time in history. These days people groups confronting the issue of confinement of non-sustainable power sources, so to take care of this issue the best arrangement is to utilize sustainable power sources like solar oriented vitality. Solar dependence is the planet's fastest-growing sustainable power source, steadily increasing by a standard of 40 percent in the overall limit. AI can be utilized in Probabilistic Energy Forecasting. The fundamental reason behind this is to gauge the likelihood appropriation of solar oriented power age from more than one solar-based ranch all the while. In this paper, we examined -the study on how IOT assumes a significant job in solar-powered vitality and how AI approaches are utilized in solar oriented vitality.