1,235 research outputs found
Enhanced thermoelectric performance of heavy-metals (M: Ba, Pb) doped misfit-layered ceramics: (Ca2-xM xCoO3)0.62 (CoO2)
No full textEnhanced thermoelectric performance of heavy-metals (M: Ba, Pb) doped misfit-layered ceramics: (Ca2-xM xCoO3)0.62 (CoO2
CANONICAL ABERRATION THEORY IN ELECTROMAGNETIC MULTIPOLES
No full textIn a 2N-pole electromagnetic system, defining the electron optical Hamiltonian function, we have derived both general algebraic expressions (arbitrary N) and special numerical formulas (N = 3,4,5,6,7) for different aberrations from lower to higher order (i.e., the order of N - 1, N + 1, 2N - 3, 2N - 1, 3N - 5). The so-called canonical aberration theory in electromagnetic multipoles has thus been developed, which allows us to deduce angular dependencies of different aberrations and to examine the possibility for spherical correction of a round lens by using multipoles.Physics, AppliedSCI(E)0ARTICLE125968-59756
Risk factors associated with unsatisfactory hip function in children with late-diagnosed developmental dislocation of the hip treated by open reduction
No full texta b s t r a c t
Background: Open reduction with or without pelvic and femoral osteotomy is the accepted treatment
option for children older than 18 months with developmental dislocation of the hip (DDH). However, few
studies have investigated hip function in children with late DDH treated by open reduction. Therefore, we
performed a retrospective study investigating the risk factors potentially associated with unsatisfactory
hip function.
Hypothesis: We hypothesized that some risk factors can be associated with unsatisfactory hip function
in patients with late DDH treated by open reduction.
Patients and methods: We retrospectively reviewed the clinical and radiographic data of 79 children (98
hips, mean age 39.7 ± 18.6 months; range, 19–95.3) with late-detected DDH treated by open reduction.
Acetabular index (AI), Tönnis grade, Center Edge Angle (CEA), avascular necrosis of the femoral epiphysis
(AVN), and Severin radiographic grade were evaluated on radiographs. Hip function was rated according
to modified Outcome Evaluation Standard for Congenital Dislocation of the Hip with a maximum score of
15. According to type of surgery, patients were divided into four groups: open reduction alone (Group A),
open reduction in conjunction with pelvic osteotomy (Group B), and open reduction in conjunction with
femoral osteotomy and Pemberton/Salter (Group C) or Bernese-type triple pelvic osteotomy (Group D).
Analysis of variance (ANOVA), t-test, chi-square test, and multivariate regression analysis were used to
evaluate the independent risk factors of unsatisfactory hip function.
Results: The mean hip function score was 10.8 ± 2.8 (4.5–15); 61 hips (62.2%) had satisfactory function
(23 [23.5%] excellent and 38 [38.8%] good), while 37 hips (37.8%) had unsatisfactory function (16 [16.3%]
fair and 21 [21.4%] poor). Spearman correlation analysis indicated that age at surgery was negatively
correlated with function score (r = −0.326, p = 0.001). The age of patients with satisfactory hip function
(34.5 ± 14.2 months; range, 19.4−74.8) was significantly lower than those with unsatisfactory function
(43.7 ± 21 months; range, 20.6–95.3) (p = 0.011). The hip function score in Group A (14.2 ± 0.8; range,
12.8–15) was significantly higher than in the other three groups (p < 0.001). Hip function score in patients
with type III or IV AVN was significantly lower than those without AVN, or with type II AVN (p = 0.001).
Multivariate regression analysis confirmed age at surgery, type of surgery and AVN were negatively
correlated with hip function score. Logistic regression analysis and chi-square test confirmed age and type
of surgery, and AVN were independent risk factors of unsatisfactory hip function. Multivariate regression
analysis found ability to squat and amount of hip flexion and abduction, significantly decreased with age
at surgery; while presence of limping, amount of hip flexion, abduction, adduction and external rotation
significantly decreased with type of surgery.
Discussion: Age at surgery, type of surgery and severe AVN are independent risk factors for unsatisfactory
hip function in patients with late-detected DDH treated by open reduction. The ability to squat, the
amount of hip flexion and abduction are the main functional parameters affected by age and surgery.
Level of evidence: IV, case series
Figure 2 in A brief on the current occurrence of Gorsachius spp. in mainland China
No full textFigure 2. Sketch map of occurrence of the Japanese Night Heron in mainland China. Localities on the map presented in black letters are to follow Threatened Birds of Asia (BirdLife, 2001) but remaining the ones at the county and/or city level; whilst, those localities presented in red letters are the newly reported ones since 2006. Abbreviation. AM/XM, Amoy/Xiamen; BBB, Beibu Bay [Tonkin Gulf]; BJ, Beijing; BH, Beihai; DD, Dandong; FCh, Fangcheng; FZh, Fuzhou; GL, Guilin; HK/HK, Hong Kong; HP, Hepu; HT, Haitan Is.; HX, Hengxian; HY, Haiyan; HZh, Hangzhou; LSh, Lishui; NB, Ningbo; NP, Nanping; NT, Nantong; QZh, Qinzhou; RD, Rudong; ShH, Shanghai; SWS, Shaweishan; WY, Wuyuan; WZh, Wenzhou.Published as part of He, Fenqi, Wen, Cheng, Lin, Jiansheng, Jiang, Hangdong, Lin, Zhi & Xiao, Hong, 2016, A brief on the current occurrence of Gorsachius spp. in mainland China, pp. 315-317 in Zoological Systematics 41 (3) on page 316, DOI: 10.11865/zs.201634, http://zenodo.org/record/536029
Single-crystal growth and characterization of antiferromagnetically ordered EuIn2
No full textWe report the single crystal growth and characterization of EuIn2, a magnetic topological semimetal candidate according to our density functional theory (DFT) calculations. We present results from electrical resistance, magnetization, Mössbauer spectroscopy, and X-ray resonant magnetic scattering (XRMS) measurements. We observe three magnetic transitions at TN1∼14.2 K, TN2∼12.8 K and TN3∼11 K, signatures of which are consistently seen in anisotropic temperature dependent magnetic susceptibility and electrical resistance data. Mössbauer spectroscopy measurements on ground crystals suggest an incommensurate sinusoidally modulated magnetic structure below the transition at TN1∼14 K, followed by the appearance of higher harmonics in the modulation on further cooling roughly below TN2∼13 K, before the moment distribution squaring up below the lowest transition around TN3∼11 K. XRMS measurements showed the appearance of magnetic Bragg peaks below TN1∼14 K, with a propagation vector of =(τh,τ¯h,0), with τhvarying with temperature, and showing a jump at TN3∼11~K. The temperature dependence of τh between ∼11~K and 14~K shows incommensurate values consistent with the Mössbauer data. XRMS data indicate that τh remains incommensurate at low temperatures and locks into τh=0.3443(1).This is a preprint from Kuthanazhi, Brinda, Simon XM Riberolles, Dominic H. Ryan, Philip J. Ryan, Jong-Woo Kim, Lin-Lin Wang, Robert J. McQueeney, Benjamin G. Ueland, and Paul C. Canfield. "Single crystal growth and characterization of antiferromagnetically ordering EuIn 2." arXiv preprint arXiv:2308.03600 (2023). doi: https://doi.org/10.48550/arXiv.2308.03600 Published as Kuthanazhi, Brinda, Simon XM Riberolles, Dominic H. Ryan, Philip J. Ryan, Jong-Woo Kim, Lin-Lin Wang, Robert J. McQueeney, Benjamin G. Ueland, and Paul C. Canfield. "Single-crystal growth and characterization of antiferromagnetically ordered EuIn 2." Physical Review B 109, no. 21 (2024): 214401. doi: https://doi.org/10.1103/PhysRevB.109.214401
Effectiveness of Mental Model-Based Training for Complex System Operators: A Quasi-Experimental Study
No full text
Previous research has indicated that operators of complex systems will achieve higher system operation efficiency and better job performance when they hold high quality mental models. Authors of recent studies have called for greater attention toward how to improve the development of mental models especially intervention factors influencing mental model quality. The current study aimed to develop a new training strategy called mental model-based training and to examine its effectiveness by conducting a quasi-experimental study. Results demonstrated that operators exposed to mental model-based training showed more frequent reflective and learning behaviors in later work than those receiving no training, whereas mental model-based training did not result in superior mental model quality over the control condition. Findings were discussed in terms of the advantages of the mental model-based training strategy as well as its applications in complex systems.</p
Fusing MPEG-7 visual descriptors for image classification
No full textThis paper proposes three content-based image classification techniques based on fusing various low-level MPEG-7 visual descriptors. Fusion is necessary as descriptors would be otherwise incompatible and inappropriate to directly include e.g. in a Euclidean distance. Three approaches are described: A “merging” fusion combined with an SVM classifier, a back-propagation fusion combined with a KNN classifier and a Fuzzy-ART neurofuzzy network. In the latter case, fuzzy rules can be extracted in an effort to bridge the “semantic gap” between the low-level descriptors and the high-level semantics of an image. All networks were evaluated using content from the repository of the aceMedia project1 and more specifically in a beach/urban scene classification problem
Hydrogen adsorption induced surface reconstructions on Si(113) studied by LEED
No full textSurface reconstructions on Si(113) induced by dissociated hydrogen adsorption have been studied using low energy electron diffraction (LEED). It has been found that: (1) at 300 K and 80 K temperatures, with the increase of hydrogen coverage on the surface, the (3 x 1) phase transferred continuously into a hydrogen saturated (1 x 1)-2H phase; (2) flashing of the (1 x 1)-2H surface at about 1100 degrees C resulted in a complete new phase of(1 x 3) and further annealing of the sample at 1250 degrees C gave back the starting surface of (3 x 1); (3) saturated hydrogen adsorption at a sample temperature of 700 degrees C resulted in a stable new phase of(1 x 2)-H and further saturation doses of hydrogen at other temperatures below 700 degrees C did not change the (1 x 2) LEED pattern; (4) annealing of the (I x 2)-H surface in the same manner as (2) gave similar results
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