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Experimental and numerical analysis of failure in flexible pipe by a mechanism of intentional damage
Marco A. Hernández-Rojo,Jorge L. Alamilla-Lopez,M. A. Dominguez-Aguilar,Eliceo Sosa-Hernández 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.5
The use of flexible pipe in onshore applications is now commonplace; however, there is scarce information on the modes of failure that affect its mechanical integrity, so its application in a transmission systems is risky and should require further analysis. An experimental-numerical study was performed to observe changes in the mechanical response and failure modes in this type of pipes. Pipe was perforated at a working pressure of 30 kg/cm 2(426.7 psi) to simulate experimentally the conditions generated when a hot tapping hole is illegally made to plunder petroleum products. It was found that the different pipe sections have a relatively low mechanical strength, especially the layer made of high density polyethylene. Tension and compression tests were carried out to obtain the appropriate technical data to perform static simulations, considering an external hole as the failure mechanism. After finite element modeling, it was found that flexible pipe presented an initial collapse in the HDPE inner layer at a pressure of 21.09 kg/cm 2 (300 psi), which coincided with the experimental collapse induced by hot tapping drilling. This type of damage had not been studied in flexible pipelines for onshore applications. The information provided is useful in making decisions for the proper materials selection involved in the transport of hydrocarbons onshore.
Orozco, Daniela,Alarcon-Rojo, Alma Delia,Chavez-Mendoza, Celia,Luna, Lorena,Carrillo-Lopez, Luis Manuel,Ronquillo, Oswaldo Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.10
Objective: A study was conducted to determine the physicochemical quality and consumer acceptability of beef frankfurter-type sausages formulated with pecan nut paste and Mexican oregano oil (MO) of two varieties, Poliomintha longiflora Gray (Mexican oregano Poliomintha, MOP) or Lippia berlandieri (Mexican oregano Lippia, MOL). Methods: Frankfurters were processed under six treatment conditions: control (10.67% pork fat), MOP (control + 0.01% MOP), MOL (control + 0.01% MOL), MOP-N (control + 0.01% MOP + 6% pecan nut paste), MOL-N (control + 0.01% MOL + 6% pecan nut paste), and C-N (control + 6% pecan nut paste). The physicochemical properties and the consumer acceptability were determined. Results: The addition of MO and nut did not influence the water holding capacity, drip loss, and luminosity of frankfurters, but those ingredients increased pH and shear force (p<0.05) and decreased redness (p<0.05) of frankfurters. Frankfurters were generally well accepted by consumers. However, general acceptability of sausages decreased with the addition of MO. Control sausages showed the highest acceptability. Conclusion: The MO and pecan nut paste do not affect drastically the quality of frankfurters. These results provide evidence that partial replacement of pork fat by pecan nut in frankfurters maintain a consistent physicochemical quality and its commercialization looks promising given consumers' acceptance.
Quality of Life and Psychological Well-Being in Obesity Management
Miguel Á,ngel Rojo Tirado 계명대학교 간호과학연구소 2017 계명간호과학 Vol.20 No.3
Purpose: The purpose of this study was to review the Quality of Life and Psychological Well-Being in Obesity Management. Methods: Literature on psychological and behavioral issues in obesity treatment was explored. Results: Obesity is rapidly becoming one of the most important health concerns in developed countries worldwide. The increasing prevalence of obesity places significant burdens on individuals and healthcare systems. In addition to its clear clinical effects, obesity carries a substantial burden in personal terms, as measured by reduced daily functioning, and by general, health-related and obesity-specific quality-of- life (QoL) metrics. QoL has been defined as the effect of medical conditions on well being and physical and mental function, reflecting the functional effects of a disease as perceived by the patient. Hence, individuals living with obesity are subject to considerable stigma, which they may internalize and experience as shame, depression and anxiety. The negative impact of obesity on the four main domains of QOL(physical health, mental health, social functioning, and vocational functioning) largely outweighs physical symptoms and its associated co-morbidities, such as diabetes mellitus, hypertension, and coronary heart disease. Obesity per se is a cause of discrimination in several areas of social life. Psychological disturbances, frequently observed in obese people, are likely to further impair the perceived health status. Conclusion: A quantitative measurement of QOL (including the physical and mental dimensions) is critical in defining strategies to improve patients’ reported outcomes.
Hoyer, S.,Ló,pez-Morales, M.,Rojo, P.,Nascimbeni, V.,Hidalgo, S.,Astudillo-Defru, N.,Concha, F.,Contreras, Y.,Servajean, E.,Hinse, T. C. Oxford University Press 2013 Monthly notices of the Royal Astronomical Society Vol.434 No.1
<P>We report 12 new transit observations of the exoplanet WASP-4b from the Transit Monitoring in the South (TraMoS) project. These transits are combined with all previously published transit data for this planet to provide an improved radius measurement of R-p = 1.395 +/- 0.022R(jup) and improved transit ephemerides. In a new homogeneous analysis in search for transit timing variations (TTVs) we find no evidence of those with rms amplitudes larger than 20 s over a 4-yr time span. This lack of TTVs rules out the presence of additional planets in the system with masses larger than about 2.5, 2.0 and 1.0 M-circle plus around the 1:2, 5:3 and 2:1 orbital resonances. Our search for the variation of other parameters, such as orbital inclination and transit depth, also yields negative results over the total time span of the transit observations. Finally, we perform a simple study of stellar spots configurations of the system and conclude that the star rotational period is about 34 d.</P>
Israel Lerma-Reyes,German D. Mendoza-Martinez,Rolado Rojo-Rubio,Mario Mejia,J.C. Garcia-Lopez,Hector A. Lee-Rangel 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.2
Objective: This experiment was designed to evaluate the effect of supplementation with soybean or canola oil on milk production and the composition of long chain fatty acids as well as weight changes in the goats and their kids. Methods: Thirty nine mulitparous crossed Alpine×Nubian goats (initial body weight [BW] 43.5±1.7 kg) from the day of parturition were assigned to the treatments: grazing control (n = 15); grazing plus 20 mL/goat/d of supplemental soybean oil (n = 12); and grazing plus 20 mL/goat/d of supplemental canola oil (n = 12) from November 26, 2014 to March 7, 2015. The planned contrasts were: CI (control vs supplemented with oils); CII (soybean vs canola oil) to compare the treatment effects. Results: The vegetable oil supplementation reduced weight losses in lactating goats (CI: –0.060 vs 0.090 kg/d; p = 0.03) but did not improve milk production or affect kids’ growth. The content of C4, C6, C8, C10, C11, C14, and C18:1n9t in the milk was increased (p<0.05) with respect to control. However, C12, C14, C16, C18, C18:1n9c, C18:2n6c, and C18:3n3 were reduced (p<0.05) in supplemented goats. Conjugated linoleic acid (CLA) was increased (p<0.05) in goats supplemented with oils compared to the control group. Conclusion: Supplementation with 20 mL/d of soybean or canola oil did not affect milk production or kids’ performance; however, it increased CLA concentration and reduced the reduced weight losses in lactating goats.
Differential Game-based Formation Flight for Quadrotors
Manuel Jimenez-Lizarraga,Octavio Garcia,Ricardo Chapa-Garcia,Erik G. Rojo-Rodriguez 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.4
This paper focuses on a novel algorithm for the control of formation flight of a set of n-quadrotors based on the differential game approach. The mathematical model of n-quadrotors is presented using the Newton-Euler formulation considering the disturbances, and the formation flight scheme based on the game approach consists of one vehicle acting as a leader following a pre-designed trajectory meanwhile the others vehicles just follow the leader even in the presence of disturbances. A reduced dimension Riccati equation is solved in order to obtain the desired coordination. A numerical example is given in order to illustrate the effectiveness of the approach for the formation flight.
Xiong, Pan,Zhang, Xiuyun,Zhang, Fan,Yi, Ding,Zhang, Jinqiang,Sun, Bing,Tian, Huajun,Shanmukaraj, Devaraj,Rojo, Teofilo,Armand, Michel,Ma, Renzhi,Sasaki, Takayoshi,Wang, Guoxiu American Chemical Society 2018 ACS NANO Vol.12 No.12
<P>Cation-deficient two-dimensional (2D) materials, especially atomically thin nanosheets, are highly promising electrode materials for electrochemical energy storage that undergo metal ion insertion reactions, yet they have rarely been achieved thus far. Here, we report a Ti-deficient 2D unilamellar lepidocrocite-type titanium oxide (Ti<SUB>0.87</SUB>O<SUB>2</SUB>) nanosheet superlattice for sodium storage. The superlattice composed of alternately restacked defective Ti<SUB>0.87</SUB>O<SUB>2</SUB> and nitrogen-doped graphene monolayers exhibits an outstanding capacity of ∼490 mA h g<SUP>-1</SUP> at 0.1 A g<SUP>-1</SUP>, an ultralong cycle life of more than 10000 cycles with ∼0.00058% capacity decay per cycle, and especially superior low-temperature performance (100 mA h g<SUP>-1</SUP> at 12.8 A g<SUP>-1</SUP> and −5 °C), presenting the best reported performance to date. A reversible Na<SUP>+</SUP> ion intercalation mechanism without phase and structural change is verified by first-principles calculations and kinetics analysis. These results herald a promising strategy to utilize defective 2D materials for advanced energy storage applications.</P> [FIG OMISSION]</BR>