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Rafael D az 장전수학회 2013 Advanced Studies in Contemporary Mathematics Vol.23 No.1
We introduce the PWP method for counting indirect influences, and compare it with three well-known methods, namely, MICMAC, Heat Kernel, and PageRank. We provide combinatorial as well as probabilistic interpretation for the PWP method.
Rafael A. Salinas Domínguez,Abdu Orduña-Díaz,Sonia Cerón,Miguel A. Dominguez 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.1
In this study, hafnium oxide (HfO2 ) thin fi lms were deposited by spin coating technique at diff erent low deposition temperatures (150 °C, 200 °C and 250 °C). The properties of the films were measured by UV–visible spectroscopy, X-ray diff raction and Fourier transform infrared spectroscopy (FTIR) in the attenuated total refl ectance mode. The fi lms exhibit the typical absorption peaks related to Hf–O bonds. Interestingly, a trend is clearly observed between the transmittance, crystallographic planes and FTIR characteristic peaks as deposition temperature increases. Moreover, the fabrication and characterization of MOS capacitors is presented. The current–voltage and capacitance–voltage curves corroborated the trend observed in thecharacterization of the HfO 2 films.
Mapping of folic acid in the children brainstem
Ewing Duque-Dí,az,Rafael Coveñ,as 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.3
Using highly specific antisera, the neuroanatomical distribution of folic acid (FA) and retinoic acid (RA) has been studied for the first time in the children brainstem. Neither immunoreactive structures containing RA nor immunoreactive fibers containing FA were found. FA-immunoreactive perikarya (fusiform, small/medium in size, one short dendrite) were only found in the pons in three regions: central gray, reticular formation, and locus coeruleus. The number of cell bodies decreased with age. In the first case studied (2 years), a moderate density of cell bodies was observed in the central gray and reticular formation, whereas a low density was found in the locus coeruleus. In the second case (6 years), a low density of these perikarya was observed in the central gray, reticular formation, and locus coeruleus. In the third case (7 years), a low density of FA-immunoreactive cell bodies was found in the central gray and reticular formation, whereas in the locus coeruleus no immunoreactive cell bodies were observed. The distribution of FA in the central nervous system of humans and monkeys is different and, in addition, in these species the vitamin was located in different parts of the nerve cells. The restricted distribution of FA suggests that the vitamin is involved in specific physiological mechanisms.