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  • Walter de Gruyter GmbH  (10)
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  • Walter de Gruyter GmbH  (10)
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  • 1
    Online-Ressource
    Online-Ressource
    Palladium diselenide as a direct absorption saturable absorber for ultrafast mode-locked operations: from all anomalous dispersion to all normal dispersion
    Walter de Gruyter GmbH ; 2020
    In:  Nanophotonics Vol. 9, No. 14 ( 2020-09-10), p. 4295-4306
    Details
    In: Nanophotonics, Walter de Gruyter GmbH, Vol. 9, No. 14 ( 2020-09-10), p. 4295-4306
    Kurzfassung: Layered transition metal dichalcogenides with excellent nonlinear absorption properties have shown remarkable performance in acting as ultrafast photonics devices. In our work, palladium diselenide (PdSe 2 ) nanosheets with competitive advantages of wide tunable bandgap, unique puckered pentagonal structure and excellent air stability are prepared by the liquid-phase exfoliation method. Its ultrafast absorption performance was verified by demonstrating conventional and dissipative soliton operations within Er-doped fiber lasers. The minimum pulse width of the conventional soliton was 1.19 ps. Meanwhile, dissipative soliton with a 46.67 mW output power, 35.37 nm spectrum width, 14.92 ps pulse width and 2.86 nJ pulse energy was also generated successfully. Our enhanced experiment results present the excellent absorption performance of PdSe 2 and highlight the capacity of PdSe 2 in acting as ultrafast photonics devices.
    Materialart: Online-Ressource
    ISSN: 2192-8614 , 2192-8606
    URL: Article
    DOI: 10.1515/nanoph-2020-0267
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2020
    ZDB Id: 2674162-3
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  • 2
    Online-Ressource
    Online-Ressource
    Crystal structure of 4-chloro-3'-methoxy-[1,1'-biphenyl]-3-carbaldehyde, C14H11ClO2
    Walter de Gruyter GmbH ; 2015
    In:  Zeitschrift für Kristallographie - New Crystal Structures Vol. 230, No. 3 ( 2015-09-1), p. 205-206
    Details
    In: Zeitschrift für Kristallographie - New Crystal Structures, Walter de Gruyter GmbH, Vol. 230, No. 3 ( 2015-09-1), p. 205-206
    Kurzfassung: C 14 H 11 ClO 2 , orthorhombic, P2 1 2 1 2 1 (no. 19), a = 4.1210(8) Å, b = 11.363(2) Å, c = 24.982(5) Å, V = 1169.8 Å 3 , Z = 4, R gt (F) = 0.0572, wR ref (F 2 ) = 0.1287, T = 293 K.
    Materialart: Online-Ressource
    ISSN: 2197-4578 , 1433-7266
    URL: Article
    DOI: 10.1515/ncrs-2014-0003
    Sprache: Unbekannt
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2015
    ZDB Id: 2039576-0
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  • 3
    Online-Ressource
    Online-Ressource
    Crystal structure of (Z)-2-amino-4-(2-amino-2-(4-bromophenylthio)-1-cyanovinyl)-6-bromo-4H-chromene-3-carbonitrile, C19H12Br2N4OS
    Walter de Gruyter GmbH ; 2013
    In:  Zeitschrift für Kristallographie - New Crystal Structures Vol. 228, No. 3 ( 2013-10-1), p. 351-352
    Details
    In: Zeitschrift für Kristallographie - New Crystal Structures, Walter de Gruyter GmbH, Vol. 228, No. 3 ( 2013-10-1), p. 351-352
    Kurzfassung: C 19 H 12 Br 2 N 4 OS, triclinic, P 1̅ (no. 2), a = 9.536(2) Å, b = 9.977(2) Å, c = 10.160(2) Å, α = 84.16(3)°, β = 81.34(3)°, γ = 86.25(3)°, V = 949.4 Å 3 , Z = 2, R gt (F) = 0.0680, wR ref (F 2 ) = 0.1198, T = 293 K.
    Materialart: Online-Ressource
    ISSN: 2197-4578 , 1433-7266
    URL: Article
    DOI: 10.1524/ncrs.2013.0174
    Sprache: Unbekannt
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2013
    ZDB Id: 2039576-0
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  • 4
    Online-Ressource
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    Effects of ball milling on powder particle boundaries and properties of ODS copper
    Walter de Gruyter GmbH ; 2021
    In:  High Temperature Materials and Processes Vol. 40, No. 1 ( 2021-11-25), p. 361-369
    Details
    In: High Temperature Materials and Processes, Walter de Gruyter GmbH, Vol. 40, No. 1 ( 2021-11-25), p. 361-369
    Kurzfassung: Al 2 O 3 dispersion-strengthened (ODS) copper has an excellent comprehensive performance due to the strong hindrance of the high concentration nano-Al 2 O 3 to the dislocations inside copper grains. However, the processability of ODS copper is seriously deteriorated, which is caused by the presence of unfavorable microlevel Al 2 O 3 particles along powder particle boundaries. In this study, a strategy of ball-milling-induced impurity removal is adopted to surmount the dilemma. It was found that the ball milling process can significantly weaken the formation of large Al 2 O 3 particles in the primary boundaries. However, due to the activation of the powder particle surface, the metallurgical bonding between the powder particles is strengthened. The results showed that the ball-milled samples exhibited the optimal properties, including the ultimate tensile strength of 488 ± 3 MPa, elongation of 18.7 ± 0.7%, reduction in the area of 46.8 ± 1.2%, 82.2 ± 0.3 Rockwell Hardness measured on the B scale (HRB), and electrical conductivity of 77.2 ± 0.1% International Association of Classification Societies (IACS).
    Materialart: Online-Ressource
    ISSN: 2191-0324
    URL: Article
    DOI: 10.1515/htmp-2021-0036
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2021
    ZDB Id: 2602423-8
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  • 5
    Online-Ressource
    Online-Ressource
    Medicarpin induces G1 arrest and mitochondria-mediated intrinsic apoptotic pathway in bladder cancer cells
    Walter de Gruyter GmbH ; 2023
    In:  Acta Pharmaceutica Vol. 73, No. 2 ( 2023-06-01), p. 211-225
    Details
    In: Acta Pharmaceutica, Walter de Gruyter GmbH, Vol. 73, No. 2 ( 2023-06-01), p. 211-225
    Kurzfassung: Bladder cancer (BC) is the tenth most commonly diagnosed cancer. High recurrence, chemoresistance, and low response rate hinder the effective treatment of BC. Hence, a novel therapeutic strategy in the clinical management of BC is urgently needed. Medicarpin (MED), an isoflavone from Dalbergia odorifera , can promote bone mass gain and kill tumor cells, but its anti-BC effect remains obscure. This study reve aled that MED effectively inhibited the proliferation and arrested the cell cycle at the G1 phase of BC cell lines T24 and EJ-1 in vitro . In addition, MED could significantly suppress the tumor growth of BC cells in vivo . Mechanically, MED induced cell apoptosis by upregulating pro-apoptotic proteins BAK1, Bcl2-L-11, and caspase-3. Our data suggest that MED suppresses BC cell growth in vitro and in vivo via regulating mitochondria-mediated intrinsic apoptotic pathways, which can serve as a promising candidate for BC therapy.
    Materialart: Online-Ressource
    ISSN: 1846-9558
    URL: Article
    DOI: 10.2478/acph-2023-0016
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2023
    ZDB Id: 2255569-9
    SSG: 15,3
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  • 6
    Online-Ressource
    Online-Ressource
    Comparisons of different statistical models for analyzing the effects of meteorological factors on COVID-19
    Walter de Gruyter GmbH ; 2023
    In:  Frigid Zone Medicine Vol. 3, No. 3 ( 2023-08-01), p. 161-166
    Details
    In: Frigid Zone Medicine, Walter de Gruyter GmbH, Vol. 3, No. 3 ( 2023-08-01), p. 161-166
    Kurzfassung: This general non-systematic review aimed to gather information on reported statistical models examing the effects of meteorological factors on coronavirus disease 2019 (COVID-19) and compare these models. Methods PubMed, Web of Science, and Google Scholar were searched for studies on “meteorological factors and COVID-19” published between January 1, 2020, and October 1, 2022. Results The most commonly used approaches for analyzing the association between meteorological factors and COVID-19 were the linear regression model (LRM), generalized linear model (GLM), generalized additive model (GAM), and distributed lag non-linear model (DLNM). In addition to these classical models commonly applied in environmental epidemiology, machine learning techniques are increasingly being used to select risk factors for the outcome of interest and establishing robust prediction models. Conclusion Selecting an appropriate model is essential before conducting research. To ensure the reliability of analysis results, it is important to consider including non-meteorological factors ( e.g. , government policies on physical distancing, vaccination, and hygiene practices) along with meteorological factors in the model.
    Materialart: Online-Ressource
    ISSN: 2719-8073
    URL: Article
    DOI: 10.2478/fzm-2023-0020
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2023
    ZDB Id: 3120888-5
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  • 7
    Online-Ressource
    Online-Ressource
    Effect and Mechanism of High-Pressure Processing: A Case Study of Flue-Cured Tobacco
    Walter de Gruyter GmbH ; 2017
    In:  Beiträge zur Tabakforschung International/Contributions to Tobacco Research Vol. 27, No. 7 ( 2017-9-1), p. 168-181
    Details
    In: Beiträge zur Tabakforschung International/Contributions to Tobacco Research, Walter de Gruyter GmbH, Vol. 27, No. 7 ( 2017-9-1), p. 168-181
    Kurzfassung: After a high-pressure processing (HPP) treatment sensory evaluation of flue-cured tobacco showed modifications. There was no significant difference (P 〉 0.05) between the routine chemical components (total sugar, reducing sugar, nicotine, and total nitrogen) of flue-cured tobacco after high-pressure processing treatment (HPP sample) and that of an untreated control group (CG). An overall judgement, which can be made from the observations of scanning electron microscopy (SEM), X-ray computed microtomography (micro-CT) and transmission electron microscopy (TEM), is that HPP could compress the inner tunnel and tissue gap in a flue-cured tobacco leaf. However, the ultrastructure, such as the cellular cytoskeleton, would not be changed. Compared with CG, the apparent density of the HPP sample rose by 19.3%, while the true density only rose by 1.4%. This also explained that the main effect of high-pressure processing on flue-cured tobacco was microstructure compression rather than compression on the ultrastructure level. The differences between the lamina (leaf-shaped) sample, which were caused by high-pressure processing, were reflected in terahertz time-domain spectroscopy (THz-TDS), simultaneous thermal analysis (STA), and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). When the same tests were carried out using a sample that was milled to a powder, however, these differences were nearly removed. The milling process destroyed most of the microstructure of the flue-cured tobacco lamina; therefore, the results of THz-TDS, STA, and Py-GC/MS confirmed the hypothesis: That 400 MPa high-pressure processing treatment minimally changes the ultrastructure of flue-cured tobacco and only changes its relatively larger microstructure.
    Materialart: Online-Ressource
    ISSN: 1612-9237
    URL: Article
    DOI: 10.1515/cttr-2017-0017
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2017
    ZDB Id: 2125737-1
    ZDB Id: 3122575-5
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  • 8
    Online-Ressource
    Online-Ressource
    Phosphine oxide for reducing flammability of ethylene-vinyl-acetate copolymer
    Walter de Gruyter GmbH ; 2021
    In:  e-Polymers Vol. 21, No. 1 ( 2021-04-30), p. 299-308
    Details
    In: e-Polymers, Walter de Gruyter GmbH, Vol. 21, No. 1 ( 2021-04-30), p. 299-308
    Kurzfassung: In this work, a phosphorous-containing flame retardant, phenylphosphonate-based compound (EHPP), is synthesized by alcoholysis and hydrazinolysis of phenylphosphonic dichloride, which is subsequently introduced to ethylene-vinyl-acetate (EVA) copolymer to improve its flame retardant performance. The resultant compound was characterized by Fourier transform infrared (FTIR), 1 H NMR, 13 C NMR, and 31 P NMR. The influence of the EHPP on the combustion behaviors of EVA is studied by limiting oxygen index (LOI), UL-94, and cone calorimeter test. The results show that 1 wt% EHPP can reduce peak heat release rate (PHRR) by 40%. Moreover, 2 wt% EHPP can increase LOI from 20.5% to 25.5%. Thermogravimetric analysis/infrared spectrometry (TGA-FTIR) was used to detect the gaseous products of EVA/EHPP to study the gaseous-phase flame retardant mechanism. The EHPP released phosphorus-containing radicals to capture highly active free radicals to improve the flame retardancy of EVA.
    Materialart: Online-Ressource
    ISSN: 1618-7229
    URL: Article
    DOI: 10.1515/epoly-2021-0027
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2021
    ZDB Id: 2060396-4
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  • 9
    Online-Ressource
    Online-Ressource
    A Feature Extraction Method for Vibration Signal of Bearing Incipient Degradation
    Walter de Gruyter GmbH ; 2016
    In:  Measurement Science Review Vol. 16, No. 3 ( 2016-6-1), p. 149-159
    Details
    In: Measurement Science Review, Walter de Gruyter GmbH, Vol. 16, No. 3 ( 2016-6-1), p. 149-159
    Kurzfassung: Detection of incipient degradation demands extracting sensitive features accurately when signal-to-noise ratio (SNR) is very poor, which appears in most industrial environments. Vibration signals of rolling bearings are widely used for bearing fault diagnosis. In this paper, we propose a feature extraction method that combines Blind Source Separation (BSS) and Spectral Kurtosis (SK) to separate independent noise sources. Normal, and incipient fault signals from vibration tests of rolling bearings are processed. We studied 16 groups of vibration signals (which all display an increase in kurtosis) of incipient degradation after they are processed by a BSS filter. Compared with conventional kurtosis, theoretical studies of SK trends show that the SK levels vary with frequencies and some experimental studies show that SK trends of measured vibration signals of bearings vary with the amount and level of impulses in both vibration and noise signals due to bearing faults. It is found that the peak values of SK increase when vibration signals of incipient faults are processed by a BSS filter. This pre-processing by a BSS filter makes SK more sensitive to impulses caused by performance degradation of bearings.
    Materialart: Online-Ressource
    ISSN: 1335-8871
    URL: Article
    DOI: 10.1515/msr-2016-0018
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2016
    ZDB Id: 2252681-X
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  • 10
    Online-Ressource
    Online-Ressource
    Notoginsenoside R1 attenuates sevoflurane-induced neurotoxicity
    Walter de Gruyter GmbH ; 2020
    In:  Translational Neuroscience Vol. 11, No. 1 ( 2020-06-22), p. 215-226
    Details
    In: Translational Neuroscience, Walter de Gruyter GmbH, Vol. 11, No. 1 ( 2020-06-22), p. 215-226
    Kurzfassung: Sevoflurane, a volatile anesthetic, is known to induce widespread neuronal degeneration and apoptosis. Recently, the stress-inducible protein sestrin 2 and adenosine monophosphate-activated protein kinase (AMPK) have been found to regulate the levels of intracellular reactive oxygen species (ROS) and suppress oxidative stress. Notoginsenoside R1 (NGR1), a saponin isolated from Panax notoginseng , has been shown to exert neuroprotective effects. The effects of NGR1 against neurotoxicity induced by sevoflurane were assessed. Methods Sprague-Dawley rat pups on postnatal day 7 (PD7) were exposed to sevoflurane (3%) anesthesia for 6 h. NGR1 at doses of 12.5, 25, or 50 mg/kg body weight was orally administered to pups from PD2 to PD7. Results Pretreatment with NGR1 attenuated sevoflurane-induced generation of ROS and reduced apoptotic cell counts. Western blotting revealed decreased cleaved caspase 3 and Bad and Bax pro-apoptotic protein expression. NGR1 substantially upregulated nuclear factor erythroid 2-related factor 2 (Nrf2) expression along with increased heme oxygenase-1 (HO-1) and NAD(P)H quinone oxidoreductase-1 levels, suggesting Nrf2 signaling activation. Enhanced sestrin-2 and phosphorylated AMPK expression were noticed following NGR1 pretreatment. Conclusion This study revealed the neuroprotective effects of NGR1 through effective suppression of apoptosis and ROS via regulation of apoptotic proteins and activation of Nrf2/HO-1 and sestrin 2/AMPK signaling cascades.
    Materialart: Online-Ressource
    ISSN: 2081-6936
    URL: Article
    DOI: 10.1515/tnsci-2020-0118
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2020
    ZDB Id: 2581219-1
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