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Non-linear Analysis of Corrugated Plate Girders Under Patch Loading
Emanuele Maiorana,Guillaume Hervé Poh’sié,Clinton Chisom Emechebe 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.3
This work aims to analyze the effects of patch loading and load eccentricities on flat and corrugated plate girders in the linear and non-linear elastic fields considering variations in slenderness, aspect ratio, loading length, loading width, corrugated angles, local and global fold ratios. To attain these objectives, thirty-five plate girders were modeled for both linear and non-linear buckling analysis, which consisted of ten flat and twenty-five corrugated plate girders. Theoretical values of patch loading resistance were computed using Eurocode and specifications by other authors. In addition, a finite element package Abaqus program was used to obtain numerical results by geometrical and material non-linear analysis using geometric imperfections. Model verification was executed by the comparison of the theoretical and finite element results and from past experimental results obtained by other authors. In corrugated members, patch loading resistance increases with increasing corrugated angles and decreases with increasing global fold ratio. Corrugated members show higher patch loading resistance than equivalent flat web members, which could result in a 15% material reduction per unit length along the longitudinal span in the use of corrugated plates girders over flat plate girders.
Emanuele Rubilotta,Matteo Balzarro,Nicolò Trabacchin,Rita Righetti,Antonio D'Amico,Jerry G. Blaivas,Alessandro Antonelli 대한비뇨의학회 2021 Investigative and Clinical Urology Vol.62 No.4
Purpose: To assess the correlation between post-void residual urine ratio (PVR-R) and pathological bladder emptying diagnosed by pressure-flow studies (PFS) in males with lower urinary tract symptoms (LUTS). Materials and Methods: PVR-R and PVR urine were evaluated in 410 males underwent PFS for LUTS. PVR-R was the percentage of PVR to bladder volume (voided volume+PVR). Schafer and International Continence Society (ICS) nomograms, Bladder Contractility Index (BCI) were used to diagnose bladder outlet obstruction (BOO) and detrusor underactivity (DUA). We subdivided the cohort in 4 groups: Group I, BOO+/DUA+; Group II, BOO-/DUA+; Group III, BOO+/DUA−; Group IV, BOO−/DUA− (control group). We subdivided the 4 groups according to PVR-R strata: (1) 0%–20%; (2) 21%–40%; (3) 41%–60%; (4) 61%–80%; (5) 81%–100%. Results: Group I had a greater median PVR-R (50%) with a >40% in 61.4% of the cohort. Median PVR-R was 16.6% in Group II, 24% in Group III, and 0% in the control Group. According to ICS nomograms and BCI, median PVR-R and PVR were significantly higher (p<0.001) in obstructed and underactive males. PVR-R threshold of 20% allowed to recognize males with voiding disorders with high sensibility, specificity, PPV, and NPV. A PVR-R cut-off of 40% identified males with associated BOO and DUA and more severe voiding dysfunction. Conclusions: A higher PVR-R is related to a more severe pathological bladder emptying, and to the association of BOO and DUA. PVR-R may have a clinical role in first assessment of males with LUTS and severe voiding dysfunction.
Linear Elastic Behavior of Circular Holed Steel Box Sections Under Compression
Emanuele Maiorana,Carlo Pellegrino 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.3
The aim of this work is to provide insights into the linear elastic behavior of steel box sections with centered and eccentric holes, placed at various points on the sides and at the corners of sections, and subjected to uniform compression. The infl uence of the following parameters was observed on stability, mainly through critical deformed shapes: (a) ratio of section aspects, (b) length-to-width ratio, (c) slenderness of sides, (d) diameter of holes, (e) coordinates x and y of the position of the hole on one side of the box section. Indications regarding important design aspects are given: (a) the best location for a single hole, or several holes, in cross-section; (b) the eff ects of circular holes with small, medium and large diameters on the linear buckling factor; (c) the eff ect of symmetric and eccentric holes for purposes of stability; (d) the best performing transversal section for square to rectangular holed box sections, in terms of stability; (e) critical slenderness values at which transition occurs from ultimate strength collapse of stocky box sections and critical elastic stress of slender ones.
Emanuele Perrone,Ilaria Capasso,Tina Pasciuto,Alessandro Gioè,Salvatore Gueli Alletti,Stefano Restaino,Giovanni Scambia,Francesco Fanfani 대한부인종양학회 2021 Journal of Gynecologic Oncology Vol.32 No.3
Objective: The aim of this study is to analyze and draw the potential differences between therobotic-assisted surgery (RS) and the laparoscopy (LPS) in endometrial cancer staging. Methods: In this single-institution retrospective study we enrolled 1,221 consecutive clinicalstage I–III endometrial cancer patients undergone minimally invasive surgical staging. Wecompared patients treated by LPS and by RS, on the basis of perioperative and oncologicaloutcomes (disease-free survival [DFS] and overall survival [OS]). A sub-analysis of the high risk endometrial cancer population was performed in the 2 cohorts. Results: The 2 cohorts (766 treated by LPS and 455 by RS) were homogeneous in termsof perioperative and pathological data. We recorded differences in number of relapse/progression (11.7% in LPS vs. 7% in RS, p=0.008) and in number of deaths (9.8% in LPSvs. 4.8% in RS, p=0.002). Whereas, univariate and multivariate analyses according to DFSand OS confirmed that the surgical approach did not influence the DFS or the OS. In themultivariable analysis the association of the age and grading was significant for DFS and OS. In the sub-analysis of the 426 high risk EC patients (280 in LPS and 146 in RS) the univariateand the multivariate confirmed the influence of the age in DFS and OS, independently of theminimally invasive approach. Conclusions: In our large retrospective analysis, we confirmed that the RS and LPS havesimilar efficacy and safety for endometrial cancer staging also for the high-risk endometrialcancer patients.
Nanoporous Microtubes Obtained from a Cu-Ni Metallic Wire
Emanuele Francesco Marano,Danilo Lussana,Alberto Castellero,Marcello Baricco 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.2
Nanoporous microtubes of a nickel-copper alloy were obtained from a Cu-44Ni-1Mn (wt%) commercial wire (200 μm diameter). A new synthesis method was established through three steps: 1) partial oxidation of the wire at 1173 K in air, 2) removal of the inner unoxidized core by chemical etching, 3) reduction in 10 bar hydrogen atmosphere. During oxidation, the segregation of Cu and Ni occurred because of their different diffusion coefficients in the corresponding oxides. As a consequence, pores were formed by Kirkendall effect and due to selective chemical etching of the different oxides. Additional porosity formed because of volume contraction during reduction with hydrogen. After reduction, the microtube shows a composition gradient from the inner wall (almost pure nickel) to the outer wall (almost pure copper). The process allowed to obtain microtubes with tuneable wall thickness and inner pores around 180 ± 80 nm. The morphological features developed suggest improved capillarity properties for applications in MEMS.