http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Shi, Junqing,Aguilar Suarez, Luis E.,Yoon, Seong-Jun,Varghese, Shinto,Serpa, Carlos,Park, Soo Young,Lü,er, Larry,Roca-Sanjuá,n, Daniel,Miliá,n-Medina, Begoñ,a,Gierschner, Johan American Chemical Society 2017 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.121 No.41
<P>Solid state luminescence enhancement (SLE) of conjugated organic materials has had a great impact in materials science, but a deep understanding has been rather limited to date. Here, we investigate a prototype example of SLE materials, cyano-substituted distyrylbenzene (DCS), by varying systematically and subtly the substitution pattern (inter alia of the position of the cyano-substituent) to give largely different photoresponse in fluid and solid solution as well in the crystalline state. The combination of quantitative (ultra)fast optical spectroscopic techniques, appropriate quantum-chemical methods, and structural (X-ray) data allows us to elucidate and rationalize all details of the SLE process, including steric versus electronic factors, radiative versus nonradiative decay channels, and intra- versus intermolecular contributions, providing a first holistic picture of SLE.</P>
Adaptive Nonlinear Control of Induction Motor
Gerardo V. Guerrero Ramírez,Luis G. Vela Valdés,Manuel Adam Medina,Carlos D. García Beltrán,Cesar A. Villanueva López 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.1
This work addresses the problem of controlling a rigid arm (one degree of freedom robot manipulator) directly driven by an induction motor. A Lyapunov-based adaptive nonlinear controller is designed. The developed controller compensates for parametric uncertainty associated with the resistance of the rotor windings and it is capable to track asymptotically a trajectory for an angular position keeping all the internal signals bounded and guarantees the asymptotical stability of the system. Simulations are presented to illustrate the performance of this controller.
Dietary Biotin Supplementation Impairs Testis Morphology and Sperm Quality
Karina Pasten-Hidalgo,Leticia Riveron-Negrete,Gloria Sicilia-Argumedo,Gustavo Canul-Medina,Tonatiuh Salazar-Anzures,Miguel Tapia-Rodrıguez,Enrique O. Hernandez-Gonzalez,Ana Lilia Roa-Espitia,Carlos Ce 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.5
Supplements containing pharmacological concentrations of biotin are commercially available over the counter. Classical toxicity studies have considered biotin administration as harmless; however, recent investigations have shown that biotin supplementation modifies tissue morphology without changes in toxicity markers, raising concerns about the consequences of morphological changes on tissues' functions and the safety of pharmacological concentrations of the vitamin. Testes are very sensitive to toxicants, and testicular histology is a reliable method to study its function. In this work, we investigated the effects of dietary biotin supplementation on testis morphology and spermatogenesis function using an experimental model, in which we have not observed unfavorable effects on other tissue functions or toxicity markers. Male BALB/cAnNHsd mice were fed a control or a biotin-supplemented diet (1.76 or 97.7 mg biotin/kg diet) for 8 weeks. Compared to the control group, the biotin-supplemented mice presented remarkable testis morphology changes, including increased spermatogonia layers; the cellular mechanism involved is related to increased proliferation. Sperm count and serum testosterone levels were not affected, but spermatozoa motility and morphology were significantly impaired in the biotin-supplemented mice. These results caution against the use of supplements with high concentrations of biotin and indicate that biotin's pharmacological effects on morphology need to be considered in toxicological studies.
Andrés Díaz-Gomez,Mytzy Godoy,María Elizabeth Berrio,Jesús Ramirez,Andrés Felipe Jaramillo,Carlos Medina,Mary Montaño,Manuel Francisco Meléndrez 한국섬유공학회 2022 Fibers and polymers Vol.23 No.7
In this study, a polymerized polyurethane foam was formulated from tannins extracted from Pinus radiata aspolyol, and copper oxide nanoparticles (CuO-NPs) at a concentration of 2 % w/w as a nucleating agent. This produced areinforced foam with better mechanical properties and fire resistance. The impact of the addition of CuO-NPs on themechanical and thermal properties of the tannin foam was also studied. The properties studied were foaming process, foamdensity, cell morphology, flammability and thermal conductivity. The results revealed that the CuO-NPs incorporated in thefoam formulation act as nucleation centers, which decrease the pore size, strengthen the cell walls, and improve mechanicalproperties. The tannin samples showed good thermal resistance performance with a limit oxygen index (LOI) higher than21 %. The results obtained were contrasted with two foams, a commercial foam (SoudaFoam) and a foam generated with thesame dissociate, but with a commercial polyol (LHT-112). The foam with NPs had an elastic modulus of 3.7 MPa and stress(max) of 1.13 MPa, which was higher than those of the foams used as controls.
Robust Nonlinear Control of AC Brushless Motor for Electric Vehicles Application
Langarica-Cordoba, Diego,Guerrero-Ramirez, Gerardo V.,Claudio-Sanchez, Abraham,Duran-Fonseca, Miguel A.,Adam-Medina, Manuel,Astorga-Zaragoza, Carlos-Manuel The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4
This article proposes a robust nonlinear control based on Lyapunov's redesign, whose purpose is to deal with parametric uncertainty in the resistance of the motor windings. The robust controller design is based on the passivity properties of the motor, as well as energy shaping and damping injection. The application of this control technique is focused on electric vehicles mainly formed by a battery bank, a power inverter, an AC brushless motor and the mechanical transmission. The sine PWM technique is used to trigger the switching devices of inverter. The results were obtained from simulation, where is shown that robust control makes a proper tracking of electromagnetic torque.
Robust Nonlinear Control of AC Brushless Motor for Electric Vehicles Application
Diego Langarica-Cordoba,Gerardo V. Guerrero-Ramirez,Abraham Claudio-Sanchez,Miguel A. Duran-Fonseca,Manuel Adam-Medina,Carlos-Manuel Astorga-Zaragoza 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4
This article proposes a robust nonlinear control based on Lyapunov’s redesign, whose purpose is to deal with parametric uncertainty in the resistance of the motor windings. The robust controller design is based on the passivity properties of the motor, as well as energy shaping and damping injection. The application of this control technique is focused on electric vehicles mainly formed by a battery bank, a power inverter, an AC brushless motor and the mechanical transmission. The sine PWM technique is used to trigger the switching devices of inverter. The results were obtained from simulation, where is shown that robust control makes a proper tracking of electromagnetic torque.