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Lopez-Mendoza, Javier,Vargas-Flores, Edgar,Mouneu-Ornelas, Nicole,Altamirano-Arcos, Carlos Korean Society of Plastic and Reconstructive Surge 2021 Archives of Plastic Surgery Vol.48 No.4
Background The result of illicit polymer injection is chronic inflammation with foreign-body granuloma (FBG) formation. Treatment can be divided into medical and surgical. Some patients develop severe complications with need surgical treatment. This study aims to describe patients who underwent surgical removal of the FBGs and autoimmune/inflammatory syndrome induced by adjuvants (ASIA); additionally, we evaluated the quality of life after surgery. Methods In this retrospective single-center study, the authors examined data of patients who underwent surgical removal of FBG caused by illicit polymer injection for cosmetic purposes and confirmed ASIA from 2015 to 2020 by three different surgical approaches. Descriptive summary statistics were reported on patient demographics, presenting symptoms and clinical examination features, treatment strategies, histopathology reports and quality of life. Results The cohort included 11 female patients with FBGs and ASIA. The most affected anatomical zones were the combination of gluteal region, thighs and legs (40%); and thighs with legs (20%). Main presentation was: skin hyperpigmentation (90.9%), skin induration (63.6%), chronic fatigue (63.6%), and ulcers (36.4%). Surgical modalities consisted of: ultrasonic-assisted liposuction in four patients (36.4%); open en bloc excision and primary closure in four patients (36.4%); and open en bloc excision and microsurgical reconstruction in three patients (27.2%). The postoperative quality of life visual analog scale score was 83.9. Conclusions ASIA treatment represents a challenge for the plastic surgeon. Adequate surgical treatment emphasizing, when possible, the total or near-total resection of the FBG must be performed to improve ASIA evolution.
Linares-Flores, Jesus,Sira-Ramirez, Hebertt,Cuevas-Lopez, Edel F.,Contreras-Ordaz, Marco A. The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.
Jesus Linares-Flores,Hebertt Sira-Ramirez,Edel F. Cuevas-Lopez,Marco A. Contreras-Ordaz 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.
Electronic transport study of PbSe pellets prepared from self-assembled 2D-PbSe nanostructures
E. Díaz-Torres,A. Flores-Conde,A. Avila-García,M. Ortega-Lopez 한국물리학회 2018 Current Applied Physics Vol.18 No.2
This work presents a study of the electronic transport properties of PbSe pellets fabricated starting of PbSe nanostructures that exhibited a flake-like 2D morphology, which were synthesized by the coprecipitation method. Seebeck coefficient measurements revealed that the PbSe sample displays ntype conductivity, a maximum Seebeck coefficient of 512.6 mV/K around 380 K, and that the carriers scattering is dominated by acoustic and optical phonons. The Fermi level dependence on the temperature and the band gap energy are also reported. Interestingly, size-dependent confinement effects due probably to the reminiscent PbSe 2D character could be evidenced.
Effect of Storage at 10OC on Aroma of Tomato (Lycopersicon esculentum) Saladet Grown in Mexico
Fernando Diaz de Leon-Sanchez,Lucia Lopez,Fernando Rivera-Cabrera,Clara Pelayo-Zaldivar,Hector B. Escalona,Beatriz Buentello,Francisco J. Fernandez,Adolfo Garcia,Laura J. Perez-Flores 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-
Antonio D. Jover-Mendiola,Fernando A. Lopez-Prats,Alejandro Lizaur-Utrilla,Maria-Flores Vizcaya-Moreno 대한정형외과학회 2023 Clinics in Orthopedic Surgery Vol.15 No.2
Background: Comparative outcomes of minimally invasive transforaminal lumbar interbody fusion (MI-TLIF) and traditional open TLIF (O-TLIF) for degenerative lumbar disc disease have been poorly studied. The purpose of this study was to prospectively compare the outcomes between MI-TLIF and O-TLIF for patients with a degenerative disc disease, focusing on the functional capacity of patients in daily life. Methods: A prospective cohort study was performed, comparing 54 patients who underwent O-TLIF and 55 patients who underwent MI-TLIF with a follow-up of 4 years. Clinical evaluation was performed using the Oswestry Disability Index (ODI), 36-item short form survey (SF-36), and a visual analog scale for pain (VAS pain). Radiological evaluation was also performed. Results: At the final follow-up, compared with O-TLIF, MI-TLIF was associated with significantly better intraoperative results, including similar operative time (p = 0.246), lower estimated blood loss (p = 0.001), and shorter hospital stay (p = 0.001). The final ODI score was significantly better in the MI-TLIF group (p = 0.031). The SF-36-physical (p = 0.023) and VAS pain (p = 0.024) scores were significantly better in the MI-TLIF group. There was no significant difference in the fusion rate (p = 0.747). Conclusions: The MI-TLIF technique is an effective and safe procedure for degenerative lumbar disc disease. Compared to traditional O-TLIF, MI-TLIF was associated with less disability and higher quality of life, with a low rate of intraoperative and postoperative complications.
Design and experimental evaluation of a mixed-mode continuous solar dryer for plaster molds
K. M. Aguilar-Castro,J. J. Flores-Prieto,M. E. Baltazar-Lopez,E. V. Macias-Melo 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
This work aimed to develop and evaluate a mixed-mode continuous solar dryer for plaster molds for the local craft ceramics industry to reduce the drying time during the pottery manufacturing process. This novel design reduces time and movements in the manufacturing line. Indirect solar energy is used to complement direct solar energy; such a combination allows the continuous drying process to meet the energy requirements and optimize solar energy expenses. The experimental results show that the average evaporation rate is 0.7 kg/hr,the average energy consumption is 2.57 MJ/kg-H2O-evaporated, and the drying time is 4 days. The actual drying time represents 20% to 29% of the total foregoing time employed by Morelos-México craft potters. This finding indicates that the dryer continuously works using 66.4% indirect and 33.6% direct solar energy, thereby entailing lower expenses than traditional continuous drying processes.
Gutierrez-Vargas, Gildardo,Ruiz, Alberto,Lopez-Morelos, Victor H.,Kim, Jin-Yeon,Gonzalez-Sanchez, Jorge,Medina-Flores, Ariosto Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.9
One of the consequences of the 475 ℃ embrittlement of duplex stainless steels is the reduction of the resistance to localized corrosion. Therefore, the detection of this type of embrittlement before the material exhibits significant loss in toughness, and corrosion resistance is important to ensure the structural integrity of critical components under corrosion threats. In this research, conductivity measurements are performed using the alternating current potential drop (ACPD) technique with using a portable four-point probe as a nondestructive evaluation (NDE) method for detecting the embrittlement in a 2507 (UNS S32750) super duplex stainless steel (SDSS) aged at 475 ℃ from as-received condition to 300 h. The electric conductivity results were compared against two electrochemical tests namely double loop electrochemical potentiokinetic reactivation (DL-EPR) and critical pitting temperature (CPT). Mechanical tests and the microstructure characterized using scanning electron microscopy (SEM) imaging are conducted to track the progress of embrittlement. It is shown that the electric conductivity correlates with the changes in impact energy, microhardness, and CPT corrosion tests result demonstrating the feasibility of the four-point probe as a possible field-deployable method for evaluating the 475 ℃ embrittlement of 2507 SDSS.
Atoche-Socola, Katherine Joselyn,Arriola-Guillen, Luis Ernesto,Lopez-Flores, Ana Isabel,Garcia, Isadora Martini,Huertas-Mogollon, Gustavo,Collares, Fabricio Mezzomo,Leitune, Vicente Castelo Branco The Korean Academy of Prosthodonitics 2021 The Journal of Advanced Prosthodontics Vol.13 No.4
PURPOSE. This study aimed to compare the microshear bond strength (µSBS) of dual-cure resin cement in CAD-CAM zirconia after different cleaning techniques. MATERIALS AND METHODS. Fifty discs of zirconia-based ceramic from Ivoclar Vivadent were embedded in acrylic resin. The discs were divided into five groups according to the cleaning methods used: Group 1: drying with spraying + sandblasting with Al<sub>2</sub>O<sub>3</sub>; Group 2: washed with water and dried with spraying + sandblasting with Al<sub>2</sub>O<sub>3</sub>;Group 3: washed with distilled water and dried with spraying + sandblasting with Al<sub>2</sub>O<sub>3</sub> + zirconium oxide (Ivoclean); Group 4: washed with distilled water and dried with spraying + sandblasting with Al<sub>2</sub>O<sub>3</sub> + potassium hydroxide (Zirclean); and Group 5: washed with distilled water and dried with spraying + sandblasting with Al<sub>2</sub>O<sub>3</sub> + 1% NaClO. All of the groups were contaminated with artificial saliva for 1 minute and then cleaned. Statistical analyses were performed using ANOVA and Tukey's tests. RESULTS. There were statistically significant differences among all groups for µSBS (P < .05). The group treated with zirconium oxide (Group 3) showed the highest µSBS (18.75 ± 0.23 MPa). CONCLUSION. When applied to zirconia, the cleaning methods affected the bonding with resin cement differently.