Theoretical and expert system approach to photoionization theories

Petrov́ić, Dobrila; Petrović, Miomir; Miladinovic, B Tatjana

doi:10.5937/kgjsci1638053p

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…In our model we will assume that once the tensile stress exceeds a critical value σ c associated with the tensile strength of the ice, the brittle shell will crack open. Although the tensile strength of ice does not seem to be so widely investigated, values between 0.7 and 3.1 MPa have been reported [31]. The geometric amplification factor R o /∆R for thin shells may explain why in the initial stage liquid is easily squeezed out in the form of a spicule.…”

mentioning

confidence: 99%

Fast Dynamics of Water Droplets Freezing from the Outside In

et al. 2017

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A drop of water that freezes from the outside-in presents an intriguing problem: the expansion of water upon freezing is incompatible with the self-confinement by a rigid ice shell. Using high-speed imaging we show that this conundrum is resolved through an intermittent fracturing of the brittle ice shell and cavitation in the enclosed liquid, culminating in an explosion of the partially frozen droplet. We propose a basic model to elucidate the interplay between a steady build-up of stresses and their fast release. The model reveals that for millimetric droplets the fragment velocities upon explosion are independent of the droplet size and only depend on material properties (such as the tensile stress of the ice and the bulk modulus of water). For small (sub-millimetric) droplets, on the other hand, surface tension starts to play a role. In this regime we predict that water droplets with radii below 50 µm are unlikely to explode at all. We expect our findings to be relevant in the modeling of freezing cloud and rain droplets.

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confidence: 99%

Fast Dynamics of Water Droplets Freezing from the Outside In

et al. 2017

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“…3C. These values are much higher than those reported in other forms of ice (e.g., <0.3%) (12,22,23), and the strain maxima measured at −150°C (>10%) are approaching the theoretical elastic limit (13,24). Even having experienced ultra-large strain, all the bent IMFs returned to their original shape, indicating the absence of the type of creep that ice Ih in other forms generally suffers from under high strain (23,28,29).…”

Section: Elastic Bending Of Imfsmentioning

confidence: 62%

“…As a result, ice has been extensively studied in the past centuries (1,2,(6)(7)(8)(9)(10). Bulk ice is rigid and fragile, leading to natural phenomena such as avalanches, glacier sliding, and sea ice fragmentation (1,11,12). The maximum elastic strain is experimentally found to be much lower than the theoretical limit of >10% (13).…”

mentioning

confidence: 99%

Elastic ice microfibers

Cui

et al. 2021

Science

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Ice is known to be a rigid and brittle crystal that fractures when deformed. We demonstrate that ice grown as single-crystal ice microfibers (IMFs) with diameters ranging from 10 micrometers to less than 800 nanometers is highly elastic. Under cryotemperature, we could reversibly bend the IMFs up to a maximum strain of 10.9%, which approaches the theoretical elastic limit. We also observed a pressure-induced phase transition of ice from Ih to II on the compressive side of sharply bent IMFs. The high optical quality allows for low-loss optical waveguiding and whispering-gallery-mode resonance in our IMFs. The discovery of these flexible ice fibers opens opportunities for exploring ice physics and ice-related technology on micro- and nanometer scales.

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“…The compressive strength of solid ice increases by approximately fourfold when transitioning from 0 to −40 °C. [ 59 ] Freezing enabled us to prepare GelMA hydrogel‐based MNs with complete demolding and improved mechanical strength, and the addition of CPAs ensured acceptable cell survival. Consistent with our results, a previous study found that fabrication in medium containing 10% DMSO did not enable the production of morphologically intact cryoMNs.…”

Section: Discussionmentioning

confidence: 99%

Organoid‐Loaded Cryomicroneedles for Biomimic Hair Regeneration

Zheng,

Yang,

Feng

et al. 2023

Adv Funct Materials

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Organoids have attracted extensive attention in the field of hair follicle (HF) tissue engineering and regeneration. However, HF organoid implantation faces a number of difficulties, such as low viability ratios, invasive trauma, and complicated procedures. To overcome these issues, a convenient and minimally invasive delivery approach with high efficiency and cell viability is required. Here, HF organoid‐loaded methacrylated gelatin‐cryomicroneedles (GelMA‐cryoMNs) that are capable of efficient transdermal delivery and can maintain the viability of the embedded organoids are developed. The GelMA‐cryoMNs are fabricated by a stepwise cryogenic molding process using a balanced ratio of cryopreservation agents and GelMA hydrogel. They can be inserted easily into porcine skin and melted without leaving residue after delivering the organoids. In vitro and in vivo, organoids delivered by the cryoMNs retain cell viability, self‐assembly, and differentiation ability. In mice, HF organoid‐loaded GelMA‐cryoMNs are delivered to the superficial dermis, resulting in subsequent HF development and the formation of an array of biomimetic hair tufts that broke through the skin surface. A promising strategy is provided here for biomimetic hair neogeneration that benefits from minimal invasion, low cost, and simple fabrication. The GelMA‐cryoMNs developed here could also have broader applications in tissue engineering and organ regeneration.

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Theoretical and expert system approach to photoionization theories

Cited by 3 publications

References 9 publications

Fast Dynamics of Water Droplets Freezing from the Outside In

Fast Dynamics of Water Droplets Freezing from the Outside In

Elastic ice microfibers

Organoid‐Loaded Cryomicroneedles for Biomimic Hair Regeneration

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