Propagation of Airy-Gaussian beams in a chiral medium

Deng, Fu; Yu, Weihao; Huang, Jiayao; Zhao, Ruihuang; Lin, Jiong; Deng, Dongmei

doi:10.1140/epjd/e2016-60677-8

Cited by 23 publications

(4 citation statements)

References 18 publications

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“…Very recently, we have proposed a unique TM SAC design in which a graphene monolayer is used to cover and protect single TM atoms. 27 Following the idea of "chainmail"protected catalysts proposed by Bao and co-workers, 28 we utilized two graphene chainmail sheets to sandwich a TM SAC. The formation of strong binding between TMs and the two graphene layers can prevent metal atoms from drifting and aggregating.…”

Section: Introductionmentioning

confidence: 99%

Realizing a Not-Strong-Not-Weak Polarization Electric Field in Single-Atom Catalysts Sandwiched by Boron Nitride and Graphene Sheets for Efficient Nitrogen Fixation

et al. 2020

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Developing efficient single-atom catalysts (SACs) for nitrogen fixation is of great importance while remaining a great challenge. The lack of an effective strategy to control the polarization electric field of SACs limits their activity and selectivity. Here, using first-principles calculations, we report that a single transition metal (TM) atom sandwiched between hexagonal boron nitride (h-BN) and graphene sheets (namely, BN/TM/G) acts as an efficient SAC for the electrochemical nitrogen reduction reaction (NRR). These sandwich structures realize stable and tunable interfacial polarization fields that enable the TM atom to donate electrons to a neighboring B atom as the active site. As a result, the partially occupied p z orbital of a B atom can form B-to-N π-back bonding with the antibonding state of N 2 , thus weakening the NN bond. The not-strong-not-weak electric field on the h-BN surface further promotes N 2 adsorption and activation. The NRR catalytic activity of the BN/TM/G system is highly correlated with the degree of positively polarized charges on the TM atom. In particular, BN/Ti/G and BN/V/G are identified as promising NRR catalysts with high stability, offering excellent energy efficiency and suppression of the competing hydrogen evolution reaction.

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Section: Introductionmentioning

confidence: 99%

Realizing a Not-Strong-Not-Weak Polarization Electric Field in Single-Atom Catalysts Sandwiched by Boron Nitride and Graphene Sheets for Efficient Nitrogen Fixation

et al. 2020

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“…SOD represents the ability to scavenge free radicals and can inhibit the response of excess lipid peroxidation. MDA levels reflect the degree of lipid peroxidation in the body and indirectly reflect the degree of cellular damage (Deng et al, 2016). In a study UC model rats were induced by environment and diet intervention combined with composite TNBS and ethanol, and oral administration with sulfasalazine (0.5 g/kg), SLBZP (12 g/kg, concentrated water decoction), and vehicle (0.9% sodium chloride injection) once a day for 14 days results showed that SLBZP could increase the SOD levels and decrease MDA levels, subsequently leading to clinical benefits in UC rats (Li et al, 2012).…”

Section: Antioxidant Effectmentioning

confidence: 99%

Traditional Chinese medicine prescription Shenling BaiZhu powder to treat ulcerative colitis: Clinical evidence and potential mechanisms

2022

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Ulcerative colitis (UC), characterized by syndromes including abdominal pain, bloody stool, diarrhea, weight loss, and repeated relapse, is a non-specific inflammatory intestinal disease. In recent years, with the changing dietary habits in China, the incidence of UC has shown an upward trend. UC belongs to the category of recorded as “diarrhea,” “chronic dysentery,” and “hematochezia” in traditional Chinese medicine (TCM), and Shenling BaiZhu powder (SLBZP) is one of the most effective and commonly used prescriptions. In this review, we aim to systematically summarize the clinical application and pharmacological mechanism of SLBZP in the treatment of UC to provide a theoretical basis for its clinical use and experimental evaluation of SLBZP. Our results showed that both SLBZP and SLBZP in combination with chemical drugs, have a significant therapeutic effect against UC with few adverse reactions. Furthermore, combined therapy was better than western medicine. Further, pathophysiological studies indicated that SLBZP has anti-inflammatory, immunomodulatory, antioxidant effects, regulation relative cell signal transduction and regulation of gut microbiota. Although evidence suggests superior therapeutic efficacy of SLBZP for treating UC and the relative mechanism has been studied extensively, various shortcomings limit the existing research on the topic. There is a lack of UC animal models, especially UC with TCM syndromes, with no uniform standard and certain differences between the animal model and clinical syndrome. The dosage, dosage form, and therapeutic time of SLBZP are inconsistent and lack pharmacological verification, and clinical trial data are not detailed or sufficiently rigorous. In addition, SLSZP is composed of multiple Chinese drugs that contain massive numbers of ingredients and which or several components contribute to therapeutic effects. How they work synergistically together remains unknown. Therefore, on the one hand, large sample prospective cohort studies to clarify the clinical efficacy and safety of SLBZP in the treatment of UC are needed. In contrast, researchers should strengthen the study of the molecular biological mechanism of active ingredients and its synergistic actions, clarifying the mechanism of SLBZP in treating UC by multi-component, multi-target, and multi-pathway.

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“…Recently, there has been extensive research on the propagation characteristics of various laser beams in chiral media. Among them, one can cite stochastic electromagnetic beams (Zhuang et al 2011), Airy beams (Zhuang et al 2012), Vortex Airy beam (Liu and Zhao 2014), Airy-Gaussian beams (Deng et al 2016), Airy-Gaussian-vortex beams (Hua et al 2017), first order chirped Airy-vortex beams (Xie et al 2018), Cosh-Airy vortex beams (Yang et al 2020), Bessel-Gaussian beams (Hui et al 2018), and Pearcey-Gaussian beams (Zeng and Deng 2020), cosine-hyperbolic-Gaussian (Hricha et al 2022) and Hermite-cosh-Gaussian beam (Yaalou et al 2023). However, to the best of our knowledge, there has been no report on the properties of a HOChGB when it passes through a chiral medium.…”

Section: Introductionmentioning

confidence: 99%

Propagation properties of higher-order cosine-hyperbolic-Gaussian beams in a chiral medium

Saad,

Hricha,

Belafhal

2024

Opt Quant Electron

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The paraxial propagation of a higher-order cosine-hyperbolic-Gaussian beam (HOChGB) in a chiral medium is investigated theoretically. Analytical expression of the HOChGB passing through a chiral medium is derived based on the Huygens-Fresnel Integral and the ABCD transfer matrix. From the obtained formula, the propagation properties of this beam in a chiral medium are analyzed with numerical illustrative examples. The obtained results show that the evolution of the intensity pattern of HOChGB depends strongly on the chiral factor, the beam order, and the decentered parameter.

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Propagation of Airy-Gaussian beams in a chiral medium

Cited by 23 publications

References 18 publications

Realizing a Not-Strong-Not-Weak Polarization Electric Field in Single-Atom Catalysts Sandwiched by Boron Nitride and Graphene Sheets for Efficient Nitrogen Fixation

Realizing a Not-Strong-Not-Weak Polarization Electric Field in Single-Atom Catalysts Sandwiched by Boron Nitride and Graphene Sheets for Efficient Nitrogen Fixation

Traditional Chinese medicine prescription Shenling BaiZhu powder to treat ulcerative colitis: Clinical evidence and potential mechanisms

Propagation properties of higher-order cosine-hyperbolic-Gaussian beams in a chiral medium

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