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  • 1
    In: Nanophotonics, Walter de Gruyter GmbH, Vol. 10, No. 13 ( 2021-10-01), p. 3451-3463
    Kurzfassung: The reversible insulating-to-conducting phase transition (ICPT) of vanadium dioxide (VO 2 ) makes it a versatile candidate for the implementation of integrated optical devices. In this paper, a bi-functional in-line optical device based on a four-layer stack of PMMA/graphene/VO 2 /graphene deposited on a side-polished fiber (SPF) is proposed. The structure can be employed as an ultra-compact TE modulator or a TM-pass polarizer, operating at 1.55 μm. We show that the ICPT characteristic can be used for polarization-selective mode shaping (PSMS) to manipulate orthogonal modes separately. On the one hand, as an optical modulator, the PSMS is used to modify mode profiles so that the TE mode attenuation is maximized in the off-state (and IL is minimized in the on-state), while the power carried by the TM mode remains unchanged. As a result, a TE modulator with an ultrahigh extinction ratio (ER) of about ER = 165 dB/mm and a very low insertion loss (IL) of IL = 2.3 dB/mm is achieved. On the other hand, the structure can act as a TM-pass polarizer featuring an extremely high polarization extinction ratio (PER) of about PER = 164 dB/mm and a low TM insertion of IL = 3.86 dB/mm. The three-dimensional heat transfer calculation for the ICPT process reveals that the response time of the modulator is in the order of few nanoseconds. Moreover, the required bias voltage of the proposed device is calculated to be as low as 1.1 V. The presented results are promising a key step towards the realization of an integrated high-performance in-line modulator/polarizer.
    Materialart: Online-Ressource
    ISSN: 2192-8614
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2021
    ZDB Id: 2674162-3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2019
    In:  Current Issues in Pharmacy and Medical Sciences Vol. 32, No. 3 ( 2019-09-01), p. 115-120
    In: Current Issues in Pharmacy and Medical Sciences, Walter de Gruyter GmbH, Vol. 32, No. 3 ( 2019-09-01), p. 115-120
    Kurzfassung: As high as 20% of the population is thought to have recurrent aphthous stomatitis (RAS), hence, finding new therapeutic agents may be needed. Pomegranate ( Punica granatum ), has been extensively used in the folk medicine of many cultures, as it possesses antioxidant, anti-inflammatory and anti-bacterial properties. In this study, it is hypothesized that a topical form of pomegranate peel extract (PPE) may shorten the duration, accelerate the healing and reduce the pain of RAS patients. The presented randomized, double-blind study was conducted on 56 patients. Herein, 28 patients were advised to apply PPE gel, and the other 28 patients were given placebo gel, twice daily for one week. Efficacy evaluations were made at days 0 (before using the gel), 3, 5 and 7. The mean values of ulcer size, pain and healing duration of ulcers were compared in both groups. PPE gel was significantly effective in reducing the pain (p 〈 0.001), ulcer size (p 〈 0.001), and healing duration of ulcers (p 〈 0.001) over a period of one week. PPE in the form of oral gel can be used in the management of aphthous ulcers.
    Materialart: Online-Ressource
    ISSN: 2300-6676 , 2084-980X
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2019
    ZDB Id: 2733313-9
    SSG: 15,3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2020
    In:  International Journal of Materials Research Vol. 111, No. 9 ( 2020-09-16), p. 711-779
    In: International Journal of Materials Research, Walter de Gruyter GmbH, Vol. 111, No. 9 ( 2020-09-16), p. 711-779
    Kurzfassung: AISI 4340 is one of the most widely used steels in high-risk industries such as military, nuclear and aerospace. The strength of this steel is capable of increasing to 1 825 MPa with quench and temper heat treatment, but it results in low toughness, low impact properties and brittle-fracture especially at low temperatures. In this study, the intermediate quenching treatment was used to induce ferritic–martensitic dual-phase (∼50/50 ferrite/martensite) microstructure that led to an impact energy of 93.6 kJ m −2 , which was 241% higher than that of quench and temper treatment. Moreover, mechanical tests revealed tensile strength and hardness of 911.5 MPa and 43 HRC, respectively. Also, fractographic analysis confirmed the occurrence of the desirable ductile fracture mechanism.
    Materialart: Online-Ressource
    ISSN: 2195-8556 , 1862-5282
    RVK:
    Sprache: Unbekannt
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2020
    ZDB Id: 2232675-3
    ZDB Id: 2128058-7
    ZDB Id: 203021-4
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    In: Current Issues in Pharmacy and Medical Sciences, Walter de Gruyter GmbH, Vol. 36, No. 1 ( 2023-03-01), p. 1-7
    Kurzfassung: This study aimed to assess the effect of inferior alveolar nerve (IAN) block of the mandible and infiltration anesthesia of the maxilla using lidocaine plus epinephrine or prilocaine with felypressin anesthetic agents on systolic and diastolic blood pressures, heart rate (HR) and peripheral oxygen saturation rate of patients. This randomized double-blind clinical trial evaluated 112 patients in four groups (n=28) based on the jaw (maxilla or mandible) and type of anesthetic agent (lidocaine with epinephrine or prilocaine with felypressin). Groups 1 and 2 received IAN block of the mandible or infiltration anesthesia of the maxilla, respectively, with 2% lidocaine plus 1:80.000 epinephrine. Groups 3 and 4 received IAN block of the mandible or infiltration anesthesia of the maxilla, respectively, using prilocaine with felypressin. Systolic and diastolic blood pressures and HR were measured by an automatic upper arm blood pressure monitor and the percentage of peripheral oxygen saturation rate was measured by a finger pulse oximeter 10 minutes before the injection, immediately after injection, 10 minutes after injection and 20 minutes after injection. The mean diastolic blood pressure showed a greater reduction following the administration of lidocaine with epinephrine, as compared with prilocaine with felypressin (p 〈 0.001). The mean HR showed a significantly greater increase following the administration of lidocaine with epinephrine, as compared with prilocaine with felypressin (p 〈 0.001). The effect of type of anesthetic agent on diastolic blood pressure depended on the type of injection (p=0.033). Administration of 2% lidocaine with 1:80.000 epinephrine, in comparison to prilocaine with felypressin, can cause changes in cardiovascular parameters such as heart rate and diastolic blood pressure in patients undergoing restoration of a maxillary or mandibular molar tooth. Type of injection has no significant effect on cardiovascular parameters.
    Materialart: Online-Ressource
    ISSN: 2300-6676
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2023
    ZDB Id: 2733313-9
    SSG: 15,3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2019
    In:  Current Issues in Pharmacy and Medical Sciences Vol. 32, No. 1 ( 2019-03-01), p. 29-33
    In: Current Issues in Pharmacy and Medical Sciences, Walter de Gruyter GmbH, Vol. 32, No. 1 ( 2019-03-01), p. 29-33
    Kurzfassung: Given the increase in global mortality rate due to various types of cancer, the present study aimed to develop optimal conditions for the synthesis of cellulose-magnesium oxide nanocomposite with favorable anticancer activity. For this purpose, the Taguchi method was used to design nine experiments with varied ratios of cellulose biopolymer, magnesium oxide nanoparticles and different stirring times. The scanning electron microscopy (SEM) images confirmed the formation of cellulose-magnesium oxide nanocomposite. The anticancer activity level of nine nanocomposites studied was evaluated using MTT assay on Michigan Cancer Foundation-7 (MCF-7) cell line. The nanocomposite synthesized in experiment 9 (8 mg/ml of magnesium oxide, 2 mg/ml of cellulose and stirring time of 60 min) showed the highest growth inhibitory activity on the cancer cells. Based on the attained results,e cellulose-magnesium oxide nanocomposite synthesized in optimal conditions can be used as an eligible anticancer agent.
    Materialart: Online-Ressource
    ISSN: 2300-6676 , 2084-980X
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2019
    ZDB Id: 2733313-9
    SSG: 15,3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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