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Multicomponent Nanoparticles Synergistic One-Dimensional Nanofibers as Heterostructure Absorbers for Tunable and Efficient Microwave Absorption
HighlightsHeterogeneous interface engineering is designed by electrospinning.The introduction of Co3SnC0.7 nanoparticles increased the loss mechanism.Enhanced electromagnetic loss and improved impedance matching are achieved.The absorbers exhibit high-efficient electromagnetic wave absorption performance.Application of novel radio technologies and equipment inevitably leads to electromagnetic pollution. One-dimensional polymer-based composite membrane structures have been shown to be an effective strategy to obtain high-performance microwave absorbers. Herein, we reported a one-dimensional N-doped carbon nanofibers material which encapsulated the hollow Co3SnC0.7 nanocubes in the fiber lumen by electrospinning. Space charge stacking formed between nanoparticles can be channeled by longitudinal fibrous structures. The dielectric constant of the fibers is highly related to the carbonization temperature, and the great impedance matching can be achieved by synergetic effect between Co3SnC0.7 and carbon network. At 800 °C, the necklace-like Co3SnC0.7/CNF with 5% low load achieves an excellent RL value of − 51.2 dB at 2.3 mm and the effective absorption bandwidth of 7.44 GHz with matching thickness of 2.5 mm. The multiple electromagnetic wave (EMW) reflections and interfacial polarization between the fibers and the fibers internal contribute a major effect to attenuating the EMW. These strategies for regulating electromagnetic performance can be expanded to other electromagnetic functional materials which facilitate the development of emerging absorbers.
Journal Article
Topological rigidity of good fractal necklaces
We introduce and characterize extremal 2-cuts for good fractal necklaces. Using this characterization and the related topological properties of extremal 2-cuts, we prove that every good necklace has a unique necklace IFS in a certain sense. Also, we prove that two good necklaces admit only rigid homeomorphisms and thus the group of self-homeomorphisms of a good necklace is countable. In addition, a certain weaker co-Hopfian property of good necklaces is also obtained.
Journal Article
Obstacles for splitting multidimensional necklaces
The well-known “necklace splitting theorem” of Alon (1987) asserts that every kk-colored necklace can be fairly split into qq parts using at most tt cuts, provided k(q−1)≤tk(q-1)\\leq t. In a joint paper with Alon et al. (2009) we studied a kind of opposite question. Namely, for which values of kk and tt is there a measurable kk-coloring of the real line such that no interval has a fair splitting into 22 parts with at most tt cuts? We proved that k>t+2k>t+2 is a sufficient condition (while k>tk>t is necessary). We generalize this result to Euclidean spaces of arbitrary dimension dd, and to arbitrary number of parts qq. We prove that if k(q−1)>t+d+q−1k(q-1)>t+d+q-1, then there is a measurable kk-coloring of Rd\\mathbb {R}^d such that no axis-aligned cube has a fair qq-splitting using at most tt axis-aligned hyperplane cuts. Our bound is of the same order as a necessary condition k(q−1)>tk(q-1)>t implied by Alon’s 1987 work. Moreover, for d=1,q=2d=1,q=2 we get exactly the result of the 2009 work. Additionally, we prove that if a stronger inequality k(q−1)>dt+d+q−1k(q-1)>dt+d+q-1 is satisfied, then there is a measurable kk-coloring of Rd\\mathbb {R}^d with no axis-aligned cube having a fair qq-splitting using at most tt arbitrary hyperplane cuts. The proofs are based on the topological Baire category theorem and use algebraic independence over suitably chosen fields.
Journal Article
Design and Validation of a Smile‐Necklace Plate for Treating Inferior Patellar Pole Avulsion Fractures: A Review and Hypothesis
The patella's inferior pole transmits force generated by contraction of the quadriceps muscle to the tibial tuberosity through the attached patellar ligament, thus completing knee extension. Therefore, fractures of the patella's inferior pole disrupt the coherence of mechanical transmission in the lower extremities. There appears to be no consensus among trauma centers regarding the treatment of infrapatellar pole fractures, primarily because there is no consistent design or application of internal fixation for this type of fracture. We designed a new internal implant similar to the smile necklace based on our previous study. This smile‐necklace plate (SNP) has the advantage of both plate fixation and tension‐band wiring fixation, permitting early rehabilitation, especially in osteoporotic comminuted infrapatellar pole fractures. Finite element analysis helped verify the biomechanical advantages of the SNP in comparison with existing studies. Hence, this novel implant is a promising treatment option for inferior pole patellar fractures. In this study, we reviewed previous surgical approaches used for fixation of inferior patellar pole fractures. Inspired by the famous smile necklace, we designed and validated an original smile necklace plate(SNP) to combine plate internal fixation with a wire tension band technique. The SNP permit early rehabilitation, especially in osteoporotic comminuted infrapatellar pole fractures. Finite element analysis helped verify the biomechanical advantages of the SNP in comparison with existing studies. Hence, this novel implant hold the promise as the best option for treating inferior pole patellar fractures.
Journal Article
Optical Solitons and Vortices in Fractional Media: A Mini-Review of Recent Results
The article produces a brief review of some recent results which predict stable propagation of solitons and solitary vortices in models based on the nonlinear Schrödinger equation (NLSE) including fractional one-dimensional or two-dimensional diffraction and cubic or cubic-quintic nonlinear terms, as well as linear potentials. The fractional diffraction is represented by fractional-order spatial derivatives of the Riesz type, defined in terms of the direct and inverse Fourier transform. In this form, it can be realized by spatial-domain light propagation in optical setups with a specially devised combination of mirrors, lenses, and phase masks. The results presented in the article were chiefly obtained in a numerical form. Some analytical findings are included too, in particular, for fast moving solitons and the results produced by the variational approximation. Moreover, dissipative solitons are briefly considered, which are governed by the fractional complex Ginzburg–Landau equation.
Journal Article
Intergenerational transmission of emotional trauma through amygdala-dependent mother-to-infant transfer of specific fear
Emotional trauma is transmitted across generations. For example, children witnessing their parent expressing fear to specific sounds or images begin to express fear to those cues. Within normal range, this is adaptive, although pathological fear, such as occurs in posttraumatic stress disorder or specific phobias, is also socially transmitted to children and is thus of clinical concern. Here, using a rodent model, we report a mother-to-infant transfer of fear to a novel peppermint odor, which is dependent on the mother expressing fear to that smell in pups’ presence. Examination of pups’ neural activity using c-Fos early gene expression and ¹⁴C 2-deoxyglucose autoradiography during mother-to-infant fear transmission revealed lateral and basal amygdala nuclei activity, with a causal role highlighted by pharmacological inactivation of pups’ amygdala preventing the fear transmission. Maternal presence was not needed for fear transmission, because an elevation of pups’ corticosterone induced by the odor of the frightened mother along with a novel peppermint odor was sufficient to produce pups’ subsequent aversion to that odor. Disruption of axonal tracts from the Grueneberg ganglion, a structure implicated in alarm chemosignaling, or blockade of pups’ alarm odor-induced corticosterone increase prevented transfer of fear. These memories are acquired at younger ages compared with amygdala-dependent odor-shock conditioning and are more enduring following minimal conditioning. Our results provide clues to understanding transmission of specific fears across generations and its dependence upon maternal induction of pups’ stress response paired with the cue to induce amygdala-dependent learning plasticity. Results are discussed within the context of caregiver emotional responses and adaptive vs. pathological fears social transmission.
Journal Article
Application of Kansei engineering in the innovative design of traditional fashion elements
Kansei engineering can quickly establish the relationship between human emotion and product composition, and it is expected to be an important method for design evaluation. This paper investigates the application of Yungang Grottoes Bodhisattva necklaces to modern attire, specifically the cheongsam, with a focus on the Kansei Engineering-based design approach. The study introduces sensory evaluation to analyse the suitability of various types of Yungang Grottoes Bodhisattva necklaces in cheongsam designs and the sensual style of high-fit cheongsam designs. Two experiments were conducted, with Experiment 1 assessing the suitability of Yungang Grottoes Bodhisattva necklaces on different traditional cheongsam, and Experiment 2 examining the overall style of cheongsam designs when combined with Yungang Grottoes Bodhisattva necklace designs. Fuzzy logic was employed in Experiment 1 to evaluate the suitability of each necklace element, while Experiment 2 incorporated sensory evaluation to determine the sensual style of high-fit cheongsam designs, assessed through subjective ratings by 50 industry experts and 50 evaluators (women aged 18 to 35). The investigation utilized standard procedures for subjective evaluation experiments, resulting in the determination of the suitability of three mainstream cheongsam designs with 24 Yungang Grottoes Bodhisattva necklaces, as well as the identification of high-fit cheongsam sensual styles. The paper concludes by providing recommendations for the design of Yungang Grottoes Bodhisattva necklaces on the cheongsam, utilizing the relative weight values of cheongsam designs as guidance for future applications. This research contributes to understanding the integration of cultural artefacts in contemporary fashion, offering insights into design considerations and potential enhancements of the cheongsam through the incorporation of Yungang Grottoes Bodhisattva necklaces.
Journal Article
Local Metric and Partition Resolvability of Graphs With Applications
The distance‐based graph parameters are being used extensively in the fields of chemistry, computer science, scheduling and in many operations’ management problems. The unique identification of vertices plays a key role in the computation of these parameters. The local versions of these parameters deal with adjacent vertices and, in this manner, provide more applicability. In this manuscript, the exact values of local metric dimension and local partition dimension of tadpole and necklace graphs have been computed. The article also discusses the application of a local metric basis in the optimal allocation of fire stations in a region.
Journal Article
ENUMERATING NECKLACES WITH TRANSITIONS
Necklaces are the equivalence classes of words under the action of the cyclic group. Let a transition in a word be any change between two adjacent letters modulo the word’s length. We present a closed-form solution for the enumeration of necklaces in n beads, k colours and t transitions. We show that our result provides a more general solution to the problem of counting alternating (proper) colourings of the vertices of a regular n-gon.
Journal Article