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Tópicos Sugeridos dentro de su búsqueda.
1
artículo
Publicado 2019
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Edge detection is a digital image processing tool. It determines points in a digital image where light intensity suddenly changes. This process applies to a digital image which assumes some degree of uncertainty in the location and intensity of the pixel in the real image. In this work, we propose an edge detection model which consists in capturing this uncertainty in terms of interval images. Then we apply interval-valued fuzzy morphology to calculate the interval-valued erosion and dilation. Finally, we compute the convex combinations of the upper and lower bounds of the interval-valued erosion and dilation image, to obtain a morphological erosion and dilation respectively, and thus an edge image.
2
artículo
Publicado 2019
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Edge detection is a digital image processing tool. It determines points in a digital image where light intensity suddenly changes. This process applies to a digital image which assumes some degree of uncertainty in the location and intensity of the pixel in the real image. In this work, we propose an edge detection model which consists in capturing this uncertainty in terms of interval images. Then we apply interval-valued fuzzy morphology to calculate the interval-valued erosion and dilation. Finally, we compute the convex combinations of the upper and lower bounds of the interval-valued erosion and dilation image, to obtain a morphological erosion and dilation respectively, and thus an edge image.
3
artículo
Publicado 2025
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The Strategic Research Plan (PEI) is an essential tool, which defines roles and sets of actions that any Academic Institution must carry out. One of the priorities for academic organizations and especially for universities, is the formation of human capital. That training must develop the research and innovation capabilities of its graduates, to create, generate ventures, transfer and apply new knowledge. Various techniques can be used to prepare the PEI; however, Quality Function Deployment (QFD) includes the voice of the customer and is very effective for developing a PEI. With the use of the QFD it was obtained: the lines of investigation, the processes of planning, design, monitoring and control based on the requirements of CONCYTEC (the voice of the client). Finally, a PEI aligned with the CONCYTEC requirements is justified, thus increasing the possibilities of being able to obtain ...
4
artículo
Publicado 2021
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This research focused on the synthesis of a functional alginate-based material via chemical modification processes with two steps: oxidation and reductive amination. In previous alginate functionalization with a target molecule such as cysteine, the starting material was purified and characterized by UV-Vis,1 H-NMR and HSQC. Additionally, the application of FT-IR techniques during each step of alginate functionalization was very useful, since new bands and spiked signals around the pyranose ring (1200–1000 cm−1) and anomeric region (1000–750 cm−1) region were identified by a second derivative. Additionally, the presence of C1-H1 of β-D-mannuronic acid residue as well as C1-H1 of α-L-guluronic acid residue was observed in the FT-IR spectra, including a band at 858 cm−1 with characteristics of the N-H moiety from cysteine. The possibility of attaching cysteine molecules to an a...
5
artículo
Publicado 2020
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Background Pyrazinamide is an important drug against the latent stage of tuberculosis and is used in both first- and second-line treatment regimens. Pyrazinamide-susceptibility test usually takes a week to have a diagnosis to guide initial therapy, implying a delay in receiving appropriate therapy. The continued increase in multi-drug resistant tuberculosis and the prevalence of pyrazinamide resistance in several countries makes the development of assays for prompt identification of resistance necessary. The main cause of pyrazinamide resistance is the impairment of pyrazinamidase function attributed to mutations in the promoter and/or pncA coding gene. However, not all pncA mutations necessarily affect the pyrazinamidase function. Objective To develop a methodology to predict pyrazinamidase function from detected mutations in the pncA gene. Methods We measured the catalytic constant (k(...
6
artículo
Formulation of a functional probiotic, protein and energy drink beverage based on mago pulp and whey
Publicado 2025
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Childhood malnutrition and anemia constitute a serious public health problem, driving the search for foods enriched with protein and vitamin supplements to help reduce this issue. In this context, the present research was developed with the objective of creating a protein rich, probiotic, and energy boosting becerage based on mango (Mangifera indica), whey, and Lactobacillus casei. Five treatments were formulated with different proportions of mango pulp and whey (T1: 90/10, T2: 70/30, T3: 50/50, T4: 30/70, and T5: 10/90, with two replicates per treatment. The bererages were inoculated with L. casei, and the pH was monitored every 48 hours for 14 days. Aprogessive decrease in pH from 5.0 - 6.0 to aproximately 4.0 was observed, demonstrating the viability and stability of the probiotic during storage. Regarding protein composition, treatment T5 reached 4.92 g/100 ml of protein, while treat...
7
artículo
Publicado 2020
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The contamination of water bodies by heavy metals is a critical problem for human health and ecosystems, and it can bioaccumulate in organisms to toxic levels and even lead to the living being’s death. This research aimed to synthesize and characterize a biopolymer with the capacity to remove heavy metals in wastewater, elaborated from potato starch, glycerin, and nopal mucilage. Native potato starch of the Allcca sipas variety was extracted by conventional methods; the mucilage was extracted with ethanol. Four formulations of biopolymers were synthesized at 60 and 70 °C. The solubility, structural characteristics, and adsorption capacity of heavy metals were evaluated. Starch, mucilage, and biopolymers presented predominant functional groups as -OH, -C-O-, -NH-, -C-H-, -C-OH determined by FTIR, allowing to remove up to 50.18% of Al, 56.81% of As, 35.95% of Cr, 37.43% of Hg and 73.22%...
8
artículo
Publicado 2024
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THE OBJECTIVE OF THIS RESEARCH IS TO DEMONSTRATE, THROUGH THE DESIGN OF A QUALITY MANAGEMENT SYSTEM BASED ON THE ISO 22000:2018 STANDARD, THE INCREASE IN THE PRODUCTIVITY OF THE MOLINERA COMPANY.THIS IS BECAUSE, IN THIS ORGANIZATION, WHOSE FUNCTION IS THE PRODUCTION OF FLOUR, PASTA AND COOKIES DERIVED FROM WHEAT; LOW PRODUCTIVITY HAS BEEN EVIDENT DUE TO THE ABSENCE OF STANDARDIZATION IN ITS PROCESSES AND INSUFFICIENT SYSTEMATIZATION IN FOOD SAFETY MANAGEMENT.THEREFORE, QUANTITATIVE AND NON-EXPERIMENTAL METHODOLOGY HAS BEEN USED, THROUGH THE USE OF DESCRIPTIVE STATISTICS FOR THE INTERPRETATION OF DATA.THIS IS HOW, WHEN CARRYING OUT A BASELINE DIAGNOSIS, WHEN USING THE STATISTICAL SOFTWARE IBM SPSS STATICS, ANALYZING THE INITIAL PRODUCTIVITY AND COMPARING IT WITH THAT OBTAINED AFTER THE PREDICTION OF ESTIMATION VALUES OF THE DESIGN OF THE QUALITY MANAGEMENT SYSTEM FOR THE INTERVAL OF TWELV...
9
artículo
Publicado 2014
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With respect to the patrimonial nature of thecontract, derived from the patrimonial nature of the benefit, a lot has been written and proposed. Authors from different periods andwith different ideas have addressed the subject, since it is fundamental to understand thebasic concepts of obligation and contractualrelationship. The stance of the majority findsthe foundation of the patrimonial nature of the benefit in being a limit to private autonomy,since such nature, which is susceptible ofeconomic value, is defined by the social context,and not by the parties.In this article, the author rejects and discusses the mentioned stance. Based on the liberty that each person has to determine what is more convenient for himself and what is more efficient in economic terms, the author defends a subjective vision of the patrimonial nature of the contractual relation, and g...
10
artículo
Publicado 2014
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With respect to the patrimonial nature of thecontract, derived from the patrimonial nature of the benefit, a lot has been written and proposed. Authors from different periods andwith different ideas have addressed the subject, since it is fundamental to understand thebasic concepts of obligation and contractualrelationship. The stance of the majority findsthe foundation of the patrimonial nature of the benefit in being a limit to private autonomy,since such nature, which is susceptible ofeconomic value, is defined by the social context,and not by the parties.In this article, the author rejects and discusses the mentioned stance. Based on the liberty that each person has to determine what is more convenient for himself and what is more efficient in economic terms, the author defends a subjective vision of the patrimonial nature of the contractual relation, and g...
11
artículo
The Fire Department is a protection force for the citizens of a country. Because of its role and function, it is of vital importance to the community. This study investigates the relationship between Motivation, conceptualized as a guiding variable of behavior, and Work Values, considered as guides in the career of firefighters of the Autonomous City of Buenos Aires (Argentina). A descriptive, correlational and group difference study was carried out with a sample of 130 firefighters (25 women and 105 men), of whom 67 were paid and 63 were volunteers. The average age was 32.32 years. The Work Motivation Scale (adapted to Spanish by Gagné et al., 2012) and the Revised Scale of Work Values by Porto and Pilati (2010, Argentine adaptation by Moreno and Marcaccio, 2012) were used. It was found that extrinsically-motivated firefighters confer, autonomously and deliberately, significance to th...
12
artículo
Publicado 2006
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The Total Solar Irradiance (TSI) is the total amount of solar energy present per square unit every moment beyond the atmosphere, so it's changing every time along the year, although for many practical purposes its average is taken and has been called: The Solar Constant (1367 W/m2). In this paper, the historical efforts made to quantifcate the TSI are reviewed, the latest advances in this matter are presented and a new method to calculate its monthly average based on the SunSpot Number is proposed to apporach to its value as close as 0.05. W/m2 (RMS = 0.002).
13
artículo
Publicado 2021
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In the competition of the lighting market, LED technology has stood out for excellent characteristics, one of which is the possibility of dimming, compared to other technologies. The dimming capacity allows to find the comfort zone with respect to two parameters, illuminance and correlated colour temperature (CCT). The present work provides a methodology to find comfort with respect to two variables, the level of illumination and the CCT. A controller with a simple structure, supported by Arduino, is proposed to control the above-mentioned variables of LEDs. The LEDs are located on a tape attached to a heat sink. In addition, the use of a light box as an environment for analysis is proposed. The design of this cubicle is based on literature. The controller has the possibility to regulate 12 different channels and the linearity between the PWM output and the illuminance was verified. The ...
14
artículo
Publicado 2019
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This research was funded by FONDECYT–CONCYTEC (grant contract number 274-2015-FONDECYT).
15
objeto de conferencia
Publicado 2017
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We presented a generalization of the delay-and-sum beamforming based on the Dirac-Delta functions but with nonlinear argument. For this end, a closed-form expression of the beampattern mathcal{B}(r)=\sum\nolimits-{k,q}w(k,q,r)x(k,q,r) with r = r(θ), was derived. This expression is computationally simulated through an algorithm that includes integer-order Bessel input functions and random noise. The 4M+N model parameters provided by the Dirac-Delta method are extracted by using a Monte-Carlo-like step which selects the best values for B(r) minimizing the Monte-Carlo error for Δθ = 0.5% for the case of beam response of θ0=30 degrees. These results might sustain the fact that beamforming techniques can use Dirac-Delta functions for modeling arrival signal even in those cases where strong nonlinearity is involved.
16
artículo
Publicado 2019
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The species belonging to the genus Bothrops are very important in the field of research for possessing proteolytic enzymes, which has as main characteristics to have a varied biological action and contribute to disorders in coagulation, necrosis and hemorrhage formation therefore a modern platform is needed in the study of these enzymes to be able to suggest an updated methodological model in the study of all the proteins expressed by a biological system that allows us to know the current status of the species, as well as to use this information in the biotechnological construction of information with possible future therapeutic purposes. The first objective is to purify and characterize one of the proteolytic enzymes present in the venom, such as metalloprotease, for which we initially worked with Hydrophobic Interaction chromatography with columns from the HITrap system, which resulted...
17
artículo
Publicado 2021
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In this article, we study the existence of weak solutions for a fractional type problem driven by a nonlocal operator of elliptic type (-Δ)sa1u - λa2(|u|)u = ƒ(x, u) + g(x)|u|q(x)-2u in Ω u = 0 in ℝN \ Ω. Our approach is based on critical point theorems and variational methods.
18
artículo
Publicado 2025
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The relationship between executive functions (EF), creative personality, and academic performance in Argentine university students was examined. A total of 248 students (M = 22.97 years, SD = 4.43) from various Argentine provinces participated. The Adult Executive Functioning Inventory (ADEXI), the Cognitive Flexibility Scale, the Creative Behavior Scale (ECC), and the Creative Personality Scale (EPC) were used, along with academic performance data and sociodemographic information. Data were collected online through Google Forms and analyzed using Spearman correlations and mediation analysis with robust Maximum Likelihood estimator and Bootstrap. Cognitive flexibility exhibited the most robust correlation with grade point average (r = .281, p < .001), followed by working memory difficulties (r = -.234, p < .001). Creative personality correlated positively with grade point average (...
19
artículo
Publicado 2025
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Forest volume modeling plays a fundamental role in forest inventory, biomass estimation, and the sustainable management of timber resources. In the Amazon region of Peru, native species such as Calycophyllum spruceanum and Cedrelinga cateniformis hold high ecological and commercial value, yet remain understudied in terms of volumetric estimation. This study aimed to develop and evaluate volumetric models for both species across three ecological zones—humid forest, very humid forest, and dry forest—representing the environmental diversity of the northeastern Peruvian Amazon. A total of 18 volumetric models were fitted for each species and site condition using linear regression techniques. Model performance was assessed through adjusted coefficient of determination (R²adj), root mean square error (RMSE), mean absolute error (MAE), Akaike Information Criterion (AIC), and diagnostic ana...
20
artículo
Publicado 2020
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Two commercial varieties of Peruvian Pouteria lucuma fruits namely “Seda” and “Beltrán” were characterized in terms of their physicochemical properties as well as their primary and secondary metabolites content and profile. Free sugars, dietary fiber, and starch comprise the main components in both varieties. Phenolic compounds derived from flavanoids (flavan-3-ols), gallic acid, and their derivatives were identified. Xanthophylls were tentatively identified based on their UV-vis spectra and enclosed the majority of the carotenoids found in lucuma. Additionally, both varieties showed to be sources of lipophilic compounds such as tocopherols (?, ?, and ?) and triterpenoids. The triterpenoid ?-amyrin was identified in a Pouteria fruit for the first time. The in vitro antioxidant capacity (AoxC) of the lipophilic fraction represented approximately 30% of the total AoxC. These resul...
