http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Imperfection sensitivity to elastic buckling of wind loaded open cylindrical tanks
Godoy, Luis A.,Flores, Fernando G. Techno-Press 2002 Structural Engineering and Mechanics, An Int'l Jou Vol.13 No.5
This paper considers the buckling and post-buckling behavior of empty metal storage tanks under wind load. The structures of such tanks may be idealized as cantilever cylindrical shells, and the structural response is investigated using a computational model. The modeling employs a doubly curved finite element based on a theory by Simo and coworkers, which is capable of handling large displacements and plasticity. Buckling results for tanks with four different geometric relations are presented to consider the influence of the ratios between the radius and the height of the shell (R/L), and between the radius and the thickness (R/t). The studies aim to clarify the differences in the shells regarding their imperfection-sensitivity. The results show that thin-walled short tanks, with R/L = 3, display high imperfection sensitivity, while tanks with R/L = 0.5 are almost insensitive to imperfections. Changes in the total potential energy of tanks that would buckle under the same high wind pressures are also considered.
( Marcela Godoy ),( Jonghwan Suhr ) 한국복합재료학회 2022 Composites research Vol.35 No.6
Using non-biodegradable polymers is a severe environmental problem as they are not recyclable and generate a large amount of waste. Biopolymers, such as starch-based composites, have been considered one of the most promising replacement materials. These eco-friendly materials have the advantage of being low-cost, biodegradable, and obtained from renewable sources. However, as starch tends to be brittle and hydrophilic, it can make these materials unusable when exposed to water and limit its processability for further applications. In this work, a biobased modified starch was grafted using two bioderived materials, lauryl methacrylate (LMA) and tetrahydrofurfuryl methacrylate (THFMA), by radical polymerization. A polylactic acid (PLA) composite based on the modified starch (m-St) was fabricated to enhance its toughness. These samples were characterized by Fourier transform infrared, <sup>1</sup>H NMR and <sup>13</sup>C NMR analysis, optical and scanning electron microscopy. The starch was successfully grafted, thus improving the compatibility with the PLA matrix. The mechanical properties of these films were also studied. Results from mechanical tests showed a slight enhancement of the mechanical performance of these composites when m-St was added to the PLA matrix. Such behavior is related to the improved dispersion of m-St 1:2 on PLA, confirmed by SEM images showing enhanced compatibility between modified starch and PLA matrix. This indicated excellent properties of the produced composite film for further eco-friendly applications.
Guilherme Godoy,Marina Masetto Antunes,Ingrid de Lima Fernandes,Luciana Pelissari Manin,Caroline Zappielo,Laureane Nunes Masi,Juliana Vanessa Colombo Martins Perles,Jesuı´ Vergı´lio Visentainer,Rui Cu 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.12
We evaluated whether linseed oil (LO) modulates the effects of a high-carbohydrate diet (HCD) on liver inflammation, fatty acid (FA) accumulation, and lipid distribution in periportal and perivenous hepatocytes. The control group (control high-carbohydrate diet [HCD-C]) received an HCD with lard and soybean oil as the lipid source. The L10 and L100 groups received the HCD with 10% and 100% of LO as the lipid source, respectively. The animals were killed by decapitation before (day 0) and after receiving the diets. Liver FA composition, inflammation, and fibrogenesis gene expression were evaluated. Also, the percentage of lipid-occupied area in periportal end perivenous hepatocytes were measured. The L100 group exhibited a higher (P < .05) liver amount of omega-3 polyunsaturated FA (n-3 PUFA) and lower (P < .05) amounts of saturated FA (SFA), monounsaturated FA (MUFA), and omega-6 polyunsaturated FA (n-6 PUFA) compared with L10 or HCD-C mice. On day 56, interleukin 10 and type IV collagen gene expression were significantly upregulated and downregulated, respectively in L100. Also, the L100 group showed lower (P < .05) FA accumulation (i.e., total FA, SFA, MUFA, and n-6 PUFA). Also, L10 and L100 presented lower (P < .05) percentage of high lipid-containing portion in periportal and perivenous hepatocytes. We concluded that LO attenuation of liver inflammation promoted by an HCD is associated with increased liver n-3 PUFA levels, so modulating FA composition, deposition, and distribution in periportal and perivenous hepatocytes.
Decreased Docosahexaenoic Acid Levels in Serum of HIV Carrier Patients
Guilherme Godoy,Marina Masetto Antunes,Maria Angelica Raffaini Covas Pereira da Silva,Ingrid de Lima Fernandes,Jesuí Vergílio Visentainer,Jeane Eliete Laguila Visentainer,Rui Curi,Roberto Barbosa Bazo 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.6
The study aimed to measure serum fatty acids (FAs) composition in HIV carrier patients and compare it with non-HIV carrier patients. The FAs composition was measured by gas chromatography as follows: four saturated FAs myristic acid (14:0), palmitic acid (16:0), stearic acid (18:0), and docosanoic acid (22:0); four monounsaturated FAs 7-hexadecenoic acid (16:1 n-9), palmitoleic acid (16:1 n-7), oleic acid (18:1 n-9), and vaccenic acid (18:1 n-7); and three polyunsaturated FAs linoleic acid (18:2 n-6), dihomo-γ-linolenic acid (20:3 n-6), and docosahexaenoic acid (DHA, 22:6 n-3). We reported herein lower (P < .05) DHA concentration (by 40%) in the serum of HIV carrier patients than in non-HIV carrier patients. This FA has a pivotal role as a precursor of anti-inflammatory molecules with beneficial effects on metabolism, cardiovascular system, and immunological system. Even though most clinical studies reported beneficial effects of DHA supplementation in HIV carrier patients, this issue remains under debate. Further investigations then require to fully clarify the role of DHA in preventing or alleviating the comorbidities associated with HIV infection.
Prevalence of infectious reproductive diseases in sows from Tolima-Colombia
Nicolas Carrillo-Godoy 대한수의학회 2023 大韓獸醫學會誌 Vol.63 No.1
The prevalence of some swine reproductive and zoonotic diseases in Colombia is unknown, making their management difficult. This study assessed the prevalence of porcine circovirus type 3 (PCV3), Leptospira interrogans, pseudorabies virus, and porcine gamma-herpesvirus by polymerase chain reaction in sows in the productive stage, from farms with a history of reproductive failures, at the department of Tolima. The prevalence of PCV3 was 2.6% and 12.6% for L. interrogans, with some samples co-infected with PCV2. Owing to the coinfections with PCV2, it is necessary to establish whether the interactions between these pathogens were related to the presence of reproductive problems.
JC Trejo Godoy,Mansoo Ko 대한신경치료학회 2018 신경치료 Vol.22 No.1
Purpose The purpose of this case report was to describe the effects of a 6-week physical therapy program consisting of strengthening exercises, balance training, stretching and self- managing education of an adult with bilateral knee osteoarthritis (OA) and cerebral vascular accident (CVA) during an outpatient episode of care. Methods The individual was a 62-year-old female with a history of bilateral knee osteoarthritis and recent history of mild CVA. The subject participated in a 6-week physical therapy program consisting of strengthening exercises, balance training, stretching and self- managing education. The subject was seen 3 times a week, with a day of recovery between each therapy session. The Lower Extremity Functional Scale (LEFS), Berg Balance Scale (BBS), Manual Muscle Test (MMT), Time Up and Go (TUG), Numeric Pain Rating Scale (NPRS), 10-Meter Walk Test (10MWT) and Five Time Sit to Stand Test (FTSST) were used to assess progress in this subject. Results Outcome measures were used at evaluation and were administered every two weeks. The Timed Up and Go improved from 22 seconds to 12 seconds. The Five Time Sit to Stand Test improved from 39 seconds to 16 seconds, while the Berg Balance Scale improved from 43 to 52 points. Lower Extremity Functional Scale improved by 9 points and gait speed improved by 0.27m/s. The Numeric Pain Rating Scale was monitored throughout the course of treatment, which served as a guide that pain was not exacerbated and that the exercise program was well tolerated by the subject. Conclusion This case report describes an exercise program that significantly decreasing pain, while improving balance, functional strength, and gait kinematics with no adverse effect in a subject with bilateral knee osteoarthritis with recent mild CVA. We believe that a significant reduction of pain induces a better functional performance in the subject with OA and CVA.
Shielding effects and buckling of steel tanks in tandem arrays under wind pressures
Portela, Genock,Godoy, Luis A. Techno-Press 2005 Wind and Structures, An International Journal (WAS Vol.8 No.5
This paper deals with the buckling behavior of thin-walled aboveground tanks under wind load. In order to do that, the wind pressures are obtained by means of wind-tunnel experiments, while the structural non linear response is computed by means of a finite element discretization of the tank. Wind-tunnel models were constructed and tested to evaluate group effects in tandem configurations, i.e. one or two tanks shielding an instrumented tank. Pressures on the roof and on the cylindrical part were measured by pressure taps. The geometry of the target tank is similar in relative dimensions to typical tanks found in oil storage facilities, and several group configurations were tested with blocking tanks of different sizes and different separation between the target tank and those blocking it. The experimental results show changes in the pressure distributions around the circumference of the tank for half diameter spacing, with respect to an isolated tank with similar dimensions. Moreover, when the front tank of the tandem array has a height smaller than the target tank, increments in the windward pressures were measured. From the computational analysis, it seems that the additional stiffness provided by the roof prevents reductions in the buckling load for cases even when increments in pressures develop in the top region of the cylinder.