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  • SAGE Publications  (6)
  • 1
    Online Resource
    Online Resource
    A method for the coupled field of an orthotropic piezoelectric plate subjected to an arbitrary electro-mechanical load
    SAGE Publications ; 2020
    In:  Mathematics and Mechanics of Solids Vol. 25, No. 11 ( 2020-11), p. 2132-2152
    Details
    In: Mathematics and Mechanics of Solids, SAGE Publications, Vol. 25, No. 11 ( 2020-11), p. 2132-2152
    Abstract: There are a number of plate-type piezoelectric devices in engineering, hence it is crucial to search for a method that can accurately acquire the electro-mechanical coupled field of a piezoelectric plate. A method for calculating the coupled field of an orthotropic piezoelectric plate with arbitrary thickness under an arbitrary electro-mechanical load is put forward in this article. First, the Green’s function solution of an orthotropic piezoelectric plate subjected to a line charge and a normal line force is derived based on the general solution of the orthotropic piezoelectric material. All stress and electric components of the orthotropic piezoelectric plate are derived when the general solution is substituted into suitable harmonic functions containing undetermined constants. Once the boundary conditions and electro-mechanical equilibrium conditions are satisfied, those constants can be solved. In addition, according to the obtained Green’s function solution and superposition principle, the coupled field of the orthotropic piezoelectric plate subjected to an arbitrary electro-mechanical load can be solved. Numerical results indicate that the convergence and precision of the method are quite good. A concise skill without repeated calculations is also presented for acquiring the coupled fields in the orthotropic piezoelectric plates with various thickness, which facilitates the effective design of plate thickness in plate-type piezoelectric devices. Finally, some valuable conclusions for the fine design of plate-type piezoelectric sensors, energy harvesters and actuators are presented based on the numerical results.
    Type of Medium: Online Resource
    ISSN: 1081-2865 , 1741-3028
    URL: Article
    DOI: 10.1177/1081286520935186
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2046323-6
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  • 2
    Online Resource
    Online Resource
    A New Sesquiterpene and other Constituents from Saussurea Lappa Root
    SAGE Publications ; 2010
    In:  Natural Product Communications Vol. 5, No. 10 ( 2010-10), p. 1934578X1000501-
    Details
    In: Natural Product Communications, SAGE Publications, Vol. 5, No. 10 ( 2010-10), p. 1934578X1000501-
    Abstract: Five sesquiterpenes, dehydrocostus lactone (1), santamarine (5), β-cyclocostunolide (6), 4α-hydroxy-4β-methyldihydrocostol (7) and 10α-hydroxyl-artemisinic acid (9), along with four other compounds, β-sitosterol (2), daucosterol (3), 5-hydroxy-methyl-furaldehyde (4), and trans-syingin (8), were isolated and identified from the roots of Saussurea lappa (Compositae). Based on previous reports and our study, sesquiterpene derivatives are common and characteristic constituents of the genus Saussurea. Among the nine compounds obtained, 9 is a new sesquiterpene. It is an artemisinic acid derivative, whose structural skeleton has not been reported for Saussurea species before, but artemisinic acid is a common compound in another Compositae species, Artemisia annua. Dehydrocostus lactone (1) is present in high-content and is a possible bioprecursor of 10α-hydroxyartemisinic acid (9).
    Type of Medium: Online Resource
    ISSN: 1934-578X , 1555-9475
    URL: Article
    DOI: 10.1177/1934578X1000501002
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2010
    detail.hit.zdb_id: 2430442-6
    SSG: 15,3
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  • 3
    Online Resource
    Online Resource
    Visualization of Risk Factors and Predictive Models for Early Death of Neonatal Gastric Perforation
    SAGE Publications ; 2023
    In:  Clinical Pediatrics
    Details
    In: Clinical Pediatrics, SAGE Publications
    Abstract: A retrospective analysis was performed from May 2003 to October 2021 at our hospital. One hundred and eleven neonates diagnosed with gastric perforation were categorized into non-survivor and survivor groups based on prognosis. The mortality rate was 23.42%. Logistic regression was used to analyze the factors influencing the early neonatal death. The non-survivor groups showed more abdominal distension, vomiting, hypoxia, acidosis, hyperkalemia, and coagulation abnormalities. Serum potassium concentration (odds ratio [OR] 2.148, P = .043) was an independent risk factor; however, arterial partial pressure of oxygen (OR 0.977, P = .024), bicarbonate (OR 0.779, P = .023), and platelet count (OR 0.986, P = .014) had protective effects on neonatal death. Based on this, a visualized nomogram prediction model was constructed, patients who had a nomogram score of more than 163.787 was considered to have high risks of mortality, the area under the curve of this was up to 0.828 (95% confidence interval [0.733, 0.923]), the sensitivity was 80.0%, and the specificity was 76.9%.
    Type of Medium: Online Resource
    ISSN: 0009-9228 , 1938-2707
    URL: Article
    DOI: 10.1177/00099228231201315
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2066146-0
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  • 4
    Online Resource
    Online Resource
    Immunohistochemical detection of differentially localized up-regulation of lysyl oxidase and down-regulation of matrix metalloproteinase-1 in rhesus monkey model of chronic myocardial infarction
    SAGE Publications ; 2012
    In:  Experimental Biology and Medicine Vol. 237, No. 7 ( 2012-07), p. 853-859
    Details
    In: Experimental Biology and Medicine, SAGE Publications, Vol. 237, No. 7 ( 2012-07), p. 853-859
    Abstract: Myocardial remodeling after ischemic infarction is characterized by collagen accumulation leading to replacement and interstitial fibrosis. Type I and III collagens are predominant components in cardiac fibrosis. Lysyl oxidase (LOX) facilitates the cross-linking of type I and III fibrils, resulting in the formation of stiff fibers and their subsequent tissue deposition. However, the matrix metalloproteinases (MMPs), a family of zinc-dependent enzymes, function in the degradation of the collagen components of extracellular matrix. Tissue inhibitors for MMPs (TIMPs) manipulate the action of MMPs. To understand the contribution of these molecules to cardiac fibrosis, we developed a rhesus monkey model to determine the changes in LOX, MMP1 and TIMP1 in relation to collagen deposition after myocardial ischemic infarction. Male rhesus monkeys were subjected to left anterior descending artery ligation along with sham-operated controls. Histological examination and immunochemistry were performed eight weeks after the ischemic injury. The results showed that both type I and III collagens were increased in the scar area and in the interstitium, and the ratio of type I/III collagens also increased in the scar area but not in the interstitium. The expression of LOX was up-regulated, but the expression of MMP1 was down-regulated in residual myocytes of the scar area and the border zone. The expression of TIMP1 was not changed. The data thus demonstrated that the collagen deposition in infarcted myocardium is correlated with an enhanced cross-linking capacity and a decreased degradation process.
    Type of Medium: Online Resource
    ISSN: 1535-3702 , 1535-3699
    URL: Article
    DOI: 10.1258/ebm.2012.012070
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2012
    detail.hit.zdb_id: 2020856-X
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    The effect of nanoparticle size and nanoparticle aggregation on the flow characteristics of nanofluids by molecular dynamics simulation
    SAGE Publications ; 2019
    In:  Advances in Mechanical Engineering Vol. 11, No. 11 ( 2019-11), p. 168781401988948-
    Details
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 11, No. 11 ( 2019-11), p. 168781401988948-
    Abstract: Molecular dynamics simulation is used to investigate the flow characteristics of Cu–Ar nanofluids considering the influence of nanoparticle size and nanoparticle aggregation. Nanofluids viscosity is calculated by equilibrium molecular dynamics based on Green–Kubo equation. Results demonstrate that the viscosity of nanofluids decreases with the increase of nanoparticle size. In addition, nanoparticle aggregation results in the increase of the nanofluids viscosity. Compared with nanoparticle size, nanoparticle aggregation has a larger impact on viscosity. Nanofluids flowing in parallel-plate nanochannels are simulated. The velocity profiles are studied through three nanoparticle sizes (11.55, 14.55, and 18.33 Å) and four nanoparticle aggregate configurations. Results show that the velocity profile of 14.55 Å nanoparticle size is larger than that of other two nanoparticle sizes. As for four nanoparticles, the nanoparticles clustering as a line leads to the maximum velocity profile, while the nanoparticles clustering as a cube causes the minimum velocity profile. Compared with viscosity, nanoparticle aggregation has a greater effect on the velocity profile. When the nanoparticles are evenly distributed, the influence of viscosity on velocity profiles is dominant. Otherwise, the aggregation, aggregate configuration, and distribution of nanoparticles have a dominant impact on the flow characteristics of nanofluids.
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    URL: Article
    DOI: 10.1177/1687814019889486
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
    detail.hit.zdb_id: 2501620-9
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  • 6
    Online Resource
    Online Resource
    Numerical simulation of gasoline evaporation in refueling process
    SAGE Publications ; 2017
    In:  Advances in Mechanical Engineering Vol. 9, No. 8 ( 2017-08), p. 168781401771497-
    Details
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 9, No. 8 ( 2017-08), p. 168781401771497-
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    URL: Article
    DOI: 10.1177/1687814017714978
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 2501620-9
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