On the solidification of a supercooled liquid droplet lying on a surface

2004 ◽  
Vol 272 (1) ◽  
pp. 225-234 ◽  
Author(s):  
S. Tabakova ◽  
F. Feuillebois
Keyword(s):  
Liquid Droplet ◽  
Supercooled Liquid

scholarly journals On the phenomena of partial crystallization of highly undercooled magnesium silicate molten droplets

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ganesh Shete ◽  
Sushil Mishra ◽  
Shyamprasad Karagadde ◽  
Atul Srivastava
Keyword(s):  
Liquid Droplet ◽  
Magnesium Silicate ◽  
Supercooled Liquid ◽  
Thermal Parameters ◽  
Morphological Properties ◽  
Molybdenum Wire ◽  
Molten Droplet ◽  
Molten Droplets ◽  
Partial Crystallization ◽  
Glass Forming Materials

AbstractThe present work reports real-time observations of the phenomena of partial crystallization of one of the glass-forming materials, namely enstatite (MgSiO3) from its supercooled liquid droplet. Initially, the molten droplet has been held under purely non-contact conditions using the aerodynamic levitation technique. The desired levels of undercooling have been achieved by deliberately making the levitated molten droplet touch a thin molybdenum wire and hence to initiate heterogeneous nucleation from the point of contact. Influence of thermal parameters like undercooling, cooling rates and recalescence on the process of crystallization is investigated. To understand and report the morphological properties and extent of crystallinity, the solidified enstatite samples have been characterized using optical/scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively, which confirmed the formation of partially crystallized enstatite spherules and fully glass spherules. XRD showed sharp peaks of enstatite, which confirm crystallinity and a halo profile confirms the amorphous phase of enstatite. Based on the observations of several experiments, we propose the effect of thermal parameters such as levels of undercooling and recalescence on the partial crystallization, as well as partial glass formation from the initially molten droplets of enstatite composition.

Cross-validation of active and passive microwave snowfall products over the continental United States

2021 ◽  
Author(s):  
Kamil Mroz ◽  
Mario Montopoli ◽  
Alessandro Battaglia ◽  
Giulia Panegrossi ◽  
Pierre Kirstetter ◽  
...  
Keyword(s):  
United States ◽  
Liquid Droplet ◽  
Supercooled Liquid ◽  
Skill Score ◽  
Passive Microwave ◽  
Single Frequency ◽  
Training Dataset ◽  
Retrieval Algorithm ◽  
Dual Frequency ◽  
Low Sensitivity

AbstractSurface snowfall rate estimates from the Global Precipitation Measurement (GPM) mission’s Core Observatory sensors and the CloudSat radar are compared to those from the Multi-Radar Multi-Sensor (MRMS) radar composite product over the continental United States during the period from November 2014 to September 2020. The analysis includes: the Dual-Frequency Precipitation Radar (DPR) retrieval and its single frequency counterparts, the GPM Combined Radar Radiometer Algorithm (CORRA), the CloudSat Snow Profile product (2C-SNOW-PROFILE) and two passive microwave retrievals, i.e., the Goddard PROFiling algorithm (GPROF) and the Snow retrievaL ALgorithm fOr gMi (SLALOM). The 2C-SNOW retrieval has the highest Heidke Skill Score (HSS) for detecting snowfall among the products analysed. SLALOM ranks second; it outperforms GPROF and the other GPM algorithms, all detecting only 30% of the snow events. Since SLALOM is trained with 2C-SNOW, it suggests that the optimal use of the information content in the GMI observations critically depends on the precipitation training dataset. All the retrievals underestimate snowfall rates by a factor of two compared to MRMS. Large discrepancies (RMSE of 0.7 to 1.5 mm h-1) between space-borne and ground-based snowfall rate estimates are attributed to the complexity of the ice scattering properties and to the limitations of the remote sensing systems: the DPR instrument has low sensitivity, while the radiometric measurements are affected by the confounding effects of the background surface emissivity and of the emission of supercooled liquid droplet layers.

Study on heat transfer characteristics of liquid droplet radiator: With VS without inter-droplets coupling

2021 ◽  
Vol 156 ◽  
pp. 108199
Author(s):  
Di Huang ◽  
Kewei Ning ◽  
Fulong Zhao ◽  
Jian Deng ◽  
Xiaoyu Wang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Liquid Droplet ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

scholarly journals C. elegans germ granules require both assembly and localized regulators for mRNA repression

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Scott Takeo Aoki ◽  
Tina R. Lynch ◽  
Sarah L. Crittenden ◽  
Craig A. Bingman ◽  
Marvin Wickens ◽  
...  
Keyword(s):  
Liquid Droplet ◽  
Scaffolding Protein ◽  
P Granules ◽  
C Elegans ◽  
Cytoplasmic Rna ◽  
And Function ◽  
Rnp Granules ◽  
Key Residues ◽  
Reporter Mrna

AbstractCytoplasmic RNA–protein (RNP) granules have diverse biophysical properties, from liquid to solid, and play enigmatic roles in RNA metabolism. Nematode P granules are paradigmatic liquid droplet granules and central to germ cell development. Here we analyze a key P granule scaffolding protein, PGL-1, to investigate the functional relationship between P granule assembly and function. Using a protein–RNA tethering assay, we find that reporter mRNA expression is repressed when recruited to PGL-1. We determine the crystal structure of the PGL-1 N-terminal region to 1.5 Å, discover its dimerization, and identify key residues at the dimer interface. Mutations of those interface residues prevent P granule assembly in vivo, de-repress PGL-1 tethered mRNA, and reduce fertility. Therefore, PGL-1 dimerization lies at the heart of both P granule assembly and function. Finally, we identify the P granule-associated Argonaute WAGO-1 as crucial for repression of PGL-1 tethered mRNA. We conclude that P granule function requires both assembly and localized regulators.

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