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- 검색키워드
- 저자 : Godinez, Juan C. (검색결과 5 건)
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Godinez, Juan C.,Fadda, Dani,Lee, Jungho,You, Seung M. Elsevier 2019 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.132 No.-
<P><B>Abstract</B></P> <P>The effects of an aluminum high temperature conductive microporous coating (Al-HTCMC) on the nucleate boiling heat transfer (NBHT) coefficient and critical heat flux (CHF) are studied in saturated distilled water at 1 atm. Aluminum powders with three different mean particle diameters (d<SUB>m</SUB> = 11, 24, and 66 µm) are used in the fabrication of the Al-HTCMC. For each mean particle diameter, an optimal coating thickness to yield the highest NBHT coefficient is determined. The optimized Al-HTCMC thickness is found to result in comparable NBHT coefficients regardless of the particle diameter. Pool boiling tests with a plain aluminum surface are used for comparison. The coated and plain aluminum surfaces are treated equally before the pool boiling tests to establish a Boehmite oxidation nano layer on the aluminum surfaces. Following the Boehmite treatment, the contact angle is unmeasurable (∼0°) with the Al-HTCMC surface and 12° with a plain aluminum surface. Then, pool boiling tests are performed and reveal comparable CHF (1725–1850 kW/m<SUP>2</SUP>) values with or without the Al-HTCMC. However, the Al-HTCMC is shown experimentally to improve the NBHT coefficient by a factor of five as the wall superheat is reduced by from 31 K to 6 K just before CHF. The results obtained are also compared to similar work using an HTCMC layer on a copper surface to demonstrate the performance of the Al-HTCMC.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Study of the effects of an aluminum high temperature conductive microporous coating on pool boiling. </LI> <LI> Aluminum microporous coating (Al-HTCMC) fabricated using different aluminum powder particle sizes. </LI> <LI> Coating thickness optimized to yield highest nucleate boiling heat transfer coefficients. </LI> <LI> Boehmite treatment applied to aluminum surface with the microporous coating. </LI> </UL> </P>
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( Octavio Godinez ),( Paul Dyson ),( Ricardo Del Sol ),( Javier Barrios Gonzalez ),( Cesar Millan Pacheco ),( Armando Mejia ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.11
The transition from primary to secondary metabolism in antibiotic-producing Streptomyces correlates with expression of genes involved in stress responses. Consequently, regulatory pathways that regulate specific stress responses are potential targets to manipulate to increase antibiotic titers. In this study, genes encoding key proteins involved in regulation of the osmotic stress response in Streptomyces avermitilis, the industrial producer of avermectins, are investigated as targets. Disruption of either osaBSa, encoding a response regulator protein, or osaCSa, encoding a multidomain regulator of the alternative sigma factor SigB, led to increased production of both oligomycin, by up to 200%, and avermectin, by up to 37%. The mutations also conditionally affected morphological development; under osmotic stress, the mutants were unable to erect an aerial mycelium. In addition, we demonstrate the delivery of DNA into a streptomycete using biolistics. The data reveal that information on stress regulatory responses can be integrated in rational strain improvement to improve yields of bioactive secondary metabolites.
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Pool boiling heat transfer of a copper microporous coating in borated water
Jun, Seongchul,Godinez, Juan C.,You, Seung M.,Kim, Hwan Yeol Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.9
Pool boiling heat transfer of a copper microporous coating was experimentally studied in borated water with a concentration of boric acid from 0.0 to 5.0 vol percent (vol%) to determine the effect of boric acid on boiling heat transfer in water. A high-temperature, thermally conductive microporous coating (HTCMC) was created by sintering copper powder with an average particle size of 67 ㎛ onto a 1 cm × 1 cm plain copper surface with a coating thickness of ~300 ㎛ within a furnace in a vacuum environment. The tests showed that the nucleate boiling heat transfer coefficient (NBHT) of HTCMC became slightly less enhanced as the concentration of boric acid increased but the NBHT coefficient values were still significantly higher than those of the plain surface. The critical heat flux (CHF) values from 0 to 1.0 vol% were maintained at ~2,000 kW/㎡, and then, they gradually decreased down to ~1,700 kW/㎡ as the concentration increased further to 5.0 vol%. It is believed that the micro-scale pores of the HTCMC were partially blocked by the high boric acid concentration during the nucleate boiling such that the small bubbles were not effectively created using the HTCMC reentrant cavities as the boric acid concentration increased.
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Stability Analysis of a Family of Continuous State Feedback Synthesis: Theory and Experiments
Raúl Santiesteban-Cos,Araceli Gárate-García,Oscar Montaño-Godinez 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
A family of continuous state feedback synthesis based on sliding mode control is analyzed using aLyapunov approach, such that the compensation of growing perturbations together with state variables is shown. Robustness properties of a family of controllers, varying from the well known twisting sliding mode control law tothe PD controller, are studied. A non-smooth Lyapunov function is proposed such that global finite-time stabilityof the origin is demonstrated and tuning rules for the control gains are obtained. Moreover, since the Lyapunovfunction is strict, an upper bound for the convergence time of the closed loop system can be estimated, in spite ofthe growing perturbations with respect to the state. To illustrate the performance and robustness properties of thefeedback synthesis, experimental results are presented, using a one-link pendulum as a test bed.
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Modified Orbitozygomatic Approach without Orbital Roof Removal for Middle Fossa Lesions
Lopez-Elizalde, Ramiro,Robledo-Moreno, Edgar,O'Shea-Cuevas, Gabriel,Matute-Villasenor, Esmeralda,Campero, Alvaro,Godinez-Rubi, Marisol The Korean Neurosurgical Society 2018 Journal of Korean neurosurgical society Vol.61 No.3
Objective : The purpose of the present study was to describe an OrBitoZygomatic (OBZ) surgical variant that implies the drilling of the orbital roof and lateral wall of the orbit without orbitotomy. Methods : Design : cross-sectional study. Between January 2010 and December 2014, 18 patients with middle fossa lesions underwent the previously mentioned OBZ surgical variant. Gender, age, histopathological diagnosis, complications, and percentage of resection were registered. The detailed surgical technique is described. Results : Of the 18 cases listed in the study, nine were males and nine females. Seventeen cases (94.5%) were diagnosed as primary tumoral lesions, one case (5.5%) presented with metastasis of a carcinoma, and an additional one had a fibrous dysplasia. Age ranged between 27 and 73 years. Early complications were developed in four cases, but all of these were completely resolved. None developed enophthalmos. Conclusion : The present study illustrates a novel surgical OBZ approach that allows for the performance of a simpler and faster procedure with fewer complications, and without increasing surgical time or cerebral manipulation, for reaching lesions of the middle fossa. Thorough knowledge of the anatomy and surgical technique is essential for successful completion of the procedure.
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