Abstract We present the densely sampled early light curve of Type II supernova (SN) 2023ixf, first observed within hours explosion in nearby Pinwheel Galaxy (Messier 101; 6.7 Mpc). Comparing these data to recently updated models shock-cooling emission, we find that progenitor likely had a radius 410 ± 10 R ⊙ . Our estimate is model dependent but consistent with red supergiant. These provide goo...

The influence of high levels of wall cooling on the stability of hypervelocity boundary layers is investigated. Such conditions are relevant to experiments in high-enthalpy impulse facilities, where the wall temperature is much smaller than the free-stream temperature, as well as to some real flight scenarios. Some effects of wall cooling are well known, for instance, the stabilization of the f...

Biodiesel from most agricultural feedstocks has flow properties that are prone to startup and operability problems during cold weather. Biodiesel from soybean oil is generally a mixture of long-chain fatty acid alkyl esters composed of 0.15–0.20 mass fraction saturated esters (melting point [MP] 0 C) mixed with unsaturated esters (MP \ 0 C). This work investigates the crystallization properties...

Compression molding process can potentially be used to make high precision glass lenses. In a lens molding process, glass raw material is heated above its transition temperature and is subsequently pressed between the two mold halves into a lens shape. Controlled cooling (annealing) of the formed lens is then carried out with the molds in a closed position in order to enable uniform cooling of ...

In this paper, we study the Joule-Thomson expansion for RN-AdS black holes immersed in perfect fluid dark matter. Firstly, negative cosmological constant could be interpreted as thermodynamic pressure and its conjugate quantity with volume gave us more physical insights into hole. We derive definitions critical behaviour of Secondly, explicit expression coefficient is obtained from basic formul...

We report the earliest detection of an extremely bright optical afterglow of the gamma-ray burst (GRB) 030329 using a 30cm-telescope at Tokyo Institute of Technology (Tokyo, JAPAN). Our observation started 67 minutes after the burst, and continued for succeeding two nights until the afterglow faded below the sensitivity limit of the telescope (approximately 18 mag). Combining our data with thos...

Herein, we extend Joule-Thomson expansion to the low-dimensional regime by considering rotating Ba\~nados-Teitelboim-Zanelli (BTZ) metric in ($2+1$)-dimensional space-time. Specifically, properties of three important aspects expansion, including coefficient, inversion curve, and isenthalpic curve were studied. The divergence point coefficient zero Hawking temperature investigated. curves $T--P$...

gas turbines play an important role in supplying power for the country especially in peak electricity load. the main disadvantages are the turbines, they produce large changes are a result of climate change. however, in times of peak electricity grid and at the same time warm months, can produce gas turbines under the effect of ambient temperature, the amount of reduced considerably. the method...

We report small angle neutron scattering rocking-curve measurements of the flux line lattices in the peak effect region in a niobium single crystal. It is found that upon cooling in a magnetic field, the transverse orientational order as well as the longitudinal translational order grow rapidly with decreasing temperature, indicating diminishing population of defects in the ordering vortex matt...