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  • SAGE Publications  (7)
  • 1
    Online Resource
    Online Resource
    An improved model for tip clearance loss in transonic axial compressors
    SAGE Publications ; 2018
    In:  Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy Vol. 232, No. 4 ( 2018-06), p. 295-314
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, SAGE Publications, Vol. 232, No. 4 ( 2018-06), p. 295-314
    Abstract: An improved compressible model for estimating tip clearance loss in transonic compressors is presented with the emphasis on the effects of blade tip loading distribution and double leakage flow. Tip clearance flow is treated as three parts along the chord and the progressive relations from upstream to downstream part is revealed to be responsible for the formation of tip clearance flow. Control volume method is applied to simplify the mixing process and calculate the mixed-out loss for the three parts, separately. Computational study shows that mass flow of the incoming flow entering the control volume is consistent with that passing through an equivalent area of about half of tip leakage vortex region. The new model reveals that the second part of tip clearance flow has a larger mixed-out loss capacity than the two other parts. This difference is attributed to two factors: larger injection flow angle and more enrolled incoming flow, and both factors tend to increase the mixed-out loss. The success of the model implies that blade design or flow control strategies turning the tip clearance/main flow interface’s arrival onto blade tip pressure side downstream and the shock’s impingement point onto blade tip suction side upstream may be beneficial in desensitizing compressor performance to tip clearance size, without trading off pressure rise.
    Type of Medium: Online Resource
    ISSN: 0957-6509 , 2041-2967
    URL: Article
    DOI: 10.1177/0957650917736453
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2024892-1
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  • 2
    Online Resource
    Online Resource
    Effects of UCMSCs Delivered through Different Transplantation Approaches on Acute Radiation Enteritis in Rats
    SAGE Publications ; 2021
    In:  Cell Transplantation Vol. 30 ( 2021-01-01), p. 096368972110252-
    Details
    In: Cell Transplantation, SAGE Publications, Vol. 30 ( 2021-01-01), p. 096368972110252-
    Abstract: Radiation enteritis is the most common and serious complication of abdominal or pelvic radiation therapy. Mesenchymal stem cells (MSCs), as well as cell protection agents, inhibit apoptosis and promote the proliferation of injured tissues. 3 human umbilical cords MSCs (UCMSCs) were injected into the tail vein or peritoneal cavity of a rat model of radiation enteritis. The temporary protective effect was assessed by identification of donor cells, detection of cellular immune parameters and inflammatory cytokine levels, quantitation of jejunum mucosal preservation and examination of the rat remaining life. Only the rats in the intraperitoneal injection group exhibited a few positive donor cells 7 days after transplantation. CD 4 + /CD 8 + T cells, a cellular immune parameter, decreased in the abdominal exudate of intraperitoneal injection group, compared with the model-only control and tail vein groups (both P 〈 .05). Both serum and abdominal exudate TNF-α and IL-6 levels in the intraperitoneally injected rats rapidly decreased and were significantly different from those in the model-only control and tail vein injection groups (all P 〈 .05). Mucosal surface area and survival time increased in the intraperitoneal injection group compared with the vehicle and tail vein injection groups (all P = .000). Therefore, the administration of UCMSCs with intraperitoneal injection approach postponed death in a rat model of radiation enteritis, which was associated with reduced serum levels of proinflammatory cytokines (TNF-α, IL-6). However, UCMSCs injected via the tail vein triggered an intense cellular immune response in the serum that adversely affects their survival. This treatment failed to suppress circulating serum and abdominal exudate levels of TNF-α and IL-6 and could not provide a therapeutic benefit for prolonging life against acute radiation enteritis.
    Type of Medium: Online Resource
    ISSN: 0963-6897 , 1555-3892
    URL: Article
    DOI: 10.1177/09636897211025230
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2020466-8
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  • 3
    Online Resource
    Online Resource
    The impact of circumferential casing grooves on rotating instability in a transonic axial compressor
    SAGE Publications ; 2019
    In:  Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering Vol. 233, No. 8 ( 2019-06), p. 2868-2893
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, SAGE Publications, Vol. 233, No. 8 ( 2019-06), p. 2868-2893
    Abstract: The impact of circumferential casing grooves on rotating instability is first assessed for both design and part speed operations in a transonic axial compressor, with the purpose of developing the next generation casing treatments for vibration control. Multi-passage time-resolved computations are performed to capture the origination and propagation behavior of the instability for cases with and without casing grooves. Probed pressure signals in different passages show a nonsynchronous fluctuation of tip flow. It proves tip leakage vortex and its self-excited oscillation is responsible for this type of inconsistence, regardless of the compressor operation speed. Although flow separation on blade suction surface and the consequent shedding vortex contributes to another origin of instability, the resulted flow appears to be consistent. Casing grooves are able to enhance the synchronization by greatly suppressing both tip leakage vortex oscillations and the intermittently shedding separation vortex, especially in the front part of blade passage. Both types of instability are constrained in several separated axial scope by casing grooves, which essentially increase the damping of flow oscillations. Thus, further improvement of casing treatment design can be expected if the axial transport of the instability in the tip region is restrained more efficiently, for both extending stall margin and enhancing aerodynamic stability.
    Type of Medium: Online Resource
    ISSN: 0954-4100 , 2041-3025
    URL: Article
    DOI: 10.1177/0954410018786094
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
    detail.hit.zdb_id: 2032759-6
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  • 4
    Online Resource
    Online Resource
    The evolution of publication hotspots in the field of telemedicine from 1962 to 2015 and differences among six countries
    SAGE Publications ; 2018
    In:  Journal of Telemedicine and Telecare Vol. 24, No. 3 ( 2018-04), p. 238-253
    Details
    In: Journal of Telemedicine and Telecare, SAGE Publications, Vol. 24, No. 3 ( 2018-04), p. 238-253
    Abstract: Telemedicine has been implemented in many countries and has captured the attention of many researchers. Herein, we aim to quantify publication hotspots in the field of telemedicine, analyse their evolution, compare them in different countries, and provide visual representations. Methods We used software tools to process PubMed entries for a 54-year period and identified publication hotspots using keyword frequency analysis. We employed a keyword co-occurrence analysis, principal component analysis, multidimensional scaling analysis, and network visualization technology. Results The number of Medical Subject Heading (MeSH) terms increased with time. The most common subcategories of telemedicine between 1962 and 2015 were Remote Consultation, Teleradiology, and Telepathology. The most popular information communication technologies in telemedicine publications were related to the Internet and cell phones. The topics of Patient Satisfaction, Treatment Outcomes, and Home Care Services associated with telemedicine were highlighted after the 1990s. Use frequency of the terms Cell Phones and Self-Care increased drastically in the past six years, and the publication focus in six countries that had the highest output was different. Knowledge network maps and perceptual maps show the relationship between high-frequency MeSH terms. Discussion The telemedicine field has experienced significant growth and expansion in knowledge and innovation in the last 54 years. Publication hotspots for telemedicine lean towards clinical treatment, home care services, and personal care, and countries emphasize publishing in areas related to their national characteristics. This study quantitatively discusses publication hotspots, provides an objective and systematic understanding of this field, and suggests directions for future telemedicine research.
    Type of Medium: Online Resource
    ISSN: 1357-633X , 1758-1109
    URL: Article
    DOI: 10.1177/1357633X17693749
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2007700-2
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  • 5
    Online Resource
    Online Resource
    Clinical Characteristics and Prognosis of Small Cell Carcinoma in the Nasopharynx: A Population-Based Study
    SAGE Publications ; 2022
    In:  Cancer Control Vol. 29 ( 2022-01), p. 107327482210870-
    Details
    In: Cancer Control, SAGE Publications, Vol. 29 ( 2022-01), p. 107327482210870-
    Abstract: Nasopharyngeal small cell carcinoma (SmCC) is a rare histological type of nasopharyngeal cancer, and its prognosis remains poor. This study aimed to determine the clinical characteristics and survival prognostic factors of nasopharyngeal SmCC. Methods Detailed clinicopathologic and therapeutic characteristics of a patient diagnosed with nasopharyngeal SmCC were determined. Nasopharyngeal SmCC cases reported previously were reviewed and summarized. Furthermore, a retrospective analysis was performed on data from the Surveillance, Epidemiology, and End Results (SEER) Program database. Kaplan–Meier analysis was conducted to compare survival within groups. Univariate and multivariate analyses were performed to investigate prognostic factors. Results A nasopharyngeal SmCC patient treated with chemoradiotherapy who achieved 46 months long-term survival was reported. In reviewing 16 reported cases with epidemiologic and therapeutic details, we found most of nasopharyngeal SmCC patients were diagnosed with advanced grades and received chemoradiotherapy. In total, 13,993 cases of nasopharyngeal cancer were extracted from the SEER database, from which 57 nasopharyngeal SmCC cases were eventually screened out. The mean age of the patients was 55.70 years, and 64.9% of these cases were either grade III or IV; the median overall survival (OS) was 18 months. Statistically significant differences were observed in the OS values of groups categorized by age (P = .025) or radiotherapy (P = .037). Age ( 〈 70 years) and radiotherapy were identified as independent survival and prognostic factors. Conclusion Patients with nasopharyngeal SmCC are usually diagnosed with advanced grades and have poor prognoses; nevertheless, they can benefit from radiotherapy with prolonged overall survival.
    Type of Medium: Online Resource
    ISSN: 1073-2748 , 1526-2359
    URL: Article
    DOI: 10.1177/10732748221087075
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2004182-2
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  • 6
    Online Resource
    Online Resource
    Inverse calculation of demolition robot based on gravitational search algorithm and differential evolution neural network
    SAGE Publications ; 2020
    In:  International Journal of Advanced Robotic Systems Vol. 17, No. 3 ( 2020-05-01), p. 172988142092529-
    Details
    In: International Journal of Advanced Robotic Systems, SAGE Publications, Vol. 17, No. 3 ( 2020-05-01), p. 172988142092529-
    Abstract: For the inverse calculation of laser-guided demolition robot, its global nonlinear mapping model from laser measuring point to joint cylinder stroke has been set up with an artificial neural network. Due to the contradiction between population diversity and convergence rate in the optimization of complex neural networks by using differential evolution, a gravitational search algorithm and differential evolution is proposed to accelerate the convergence rate of differential evolution population driven by gravity. Gravitational search algorithm and differential evolution is applied to optimize the inverse calculation neural network mapping model of demolition robot, and the algorithm simulation shows that gravity can effectively regulate the convergence process of differential evolution population. Compared with the standard differential evolution, the convergence speed and accuracy of gravitational search algorithm and differential evolution are significantly improved, which has better optimization stability. The calculation results show that the output accuracy of this gravitational and differential evolution neural network can meet the calculation requirements of the positioning control of demolition robot’s manipulator. The optimization using gravitational search algorithm and differential evolution is done with the connection weights of a neural network in this article, and as similar techniques can be applied to the other hyperparameter optimization problem. Moreover, such an inverse calculation method can provide a reference for the autonomous positioning of large hydraulic series manipulator, so as to improve the robotization level of construction machinery.
    Type of Medium: Online Resource
    ISSN: 1729-8814 , 1729-8814
    URL: Article
    DOI: 10.1177/1729881420925298
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2202393-8
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  • 7
    Online Resource
    Online Resource
    Super wear-resistant and conductive cotton fabrics based on sliver nanowires
    SAGE Publications ; 2022
    In:  Journal of Industrial Textiles Vol. 51, No. 5_suppl ( 2022-06), p. 8227S-8245S
    Details
    In: Journal of Industrial Textiles, SAGE Publications, Vol. 51, No. 5_suppl ( 2022-06), p. 8227S-8245S
    Abstract: To investigate the effect of linear, rod and granular nano-silver structures on the electrical conductivity and wear resistance of cotton fabrics, silver nanowires (AgNWs), silver nano-rods (AgNRs) and silver nanoparticles (AgNPs) were separately obtained by solvothermal method, and then adsorbed on the cotton fabrics. Compared with AgNRs and AgNPs that silver nanowires could form network structure on the cotton fabrics. As the ratio of nano-sliver length to diameter increases, the effective adsorption mass of nano-sliver on the cotton increases, improving the conductivity of the textile electrode. No matter how many times of rubbing, it had no effect on the square resistance of the AgNWs/cotton. The cotton fabrics treated with silver nanowires had the best performances and wear resistance.
    Type of Medium: Online Resource
    ISSN: 1528-0837 , 1530-8057
    URL: Article
    DOI: 10.1177/1528083720982005
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2095351-3
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