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1
artículo
Publicado 2023
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Understanding how the physiological processes of trees are affected by the environment or silvicultural practices is important for forest management, which requires process-based models. It enables the evaluation of the growth of a forest under different scenarios. The 3-PG model has been widely used all over the world, justified by its simplicity and efficiency, as it uses a more accessible language and fewer parameters than other process-based models. It is a model of greatest interest for forest management because it enables the use of allometric equations to calculate variables of interest in this area, such as the average diameter at 1.30 m height (DBH), total height and stand volume. The 3-PG parameterization is essential to guarantee the model's good performance; however, in some cases, when observed data are not available, values from the literature is used or calibration is perf...
2
artículo
Publicado 2021
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From data of USA, Japan, Germany, UK, Italy and Russian, it is claimed that the Global pandemic dictated by the dynamics of Corona virus exhibits distributions that would correspond to a morphology of Bessel-like type. Under the assumption that the pandemic contains phases of infection denoted by the velocity and acceleration of propagation of virus, then a model of polynomials given by the integer-order Bessel functions is proposed. These polynomials enter in a statistical approach to define the law of infections as function of time for the ongoing global pandemic. From this, the data evolution and their different behaviors are interpreted in terms of the different phases including the Delta variant for the recent months until August 2021.
3
artículo
Publicado 2019
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The present study explores the cloud microphysics (MPs) impact on the simulation of two convective rainfall events (CREs) over the complex topography of Andes mountains, using the Weather Research and Forecasting- Advanced Research (WRF-ARW) model. The events occurred on December 29 2015 (CRE1) and January 7 2016 (CRE2). Six microphysical parameterizations (MPPs) (Thompson, WSM6, Morrison, Goddard, Milbrandt and Lin) were tested, which had been previously applied in complex orography areas. The one-way nesting technique was applied to four domains, with horizontal resolutions of 18, 6, and 3 km for the outer ones, in which cumulus and MP parameterizations were applied, while for the innermost domain, with a resolution of 0.75 km, only MP parameterization was used. It was integrated for 36 h with National Centers for Environmental Prediction (NCEP Final Operational Global Analysis (NFL) i...
4
artículo
Publicado 2020
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The study evaluated the sensitivity of the precipitation forecast in the central Andes of Peru of Weather Research and Forecasting (WRF) model to change the planetary boundary layer (PBL) schemes. In that region is located the Mantaro basin, which is one of the most important in the region. Here, the rainfall is very important to the agriculture and to the reserves of drinking water. The simulations were carried out with ten PBL schemes for 19 days in January, February, and March, between 2009 and 2012. Based on the statistical analysis (model vs. observation), the more efficient schemes were determined and analyses of the vertical profiles of some variables are shown. As a result, the schemes that most helped the model in rainfall forecasting were MYNN3 (general and north sector of the basin), Bou-Lac (central sector) and Bretherton-Park (southern sector). The model generally overestima...
5
artículo
Publicado 2018
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A sensitivity study of the performance of the Weather Research and Forecasting regional model (WRF, version 3.7) to the use of different microphysics, cumulus, and boundary layer parameterizations for short- and medium-term precipitation forecast is conducted in the Central Andes of Peru. Lin-Purdué, Thompson, and Morrison microphysics schemes were tested, as well as the Grell–Freitas, Grell 3d, and Betts–Miller–Janjic cumulus parameterizations. The tested boundary layer schemes were the Yonsei University and Mellor–Yamada–Janjic. A control configuration was defined, using the Thompson, Grell–Freitas, and Yonsei University schemes, and a set of numerical experiments is made, using different combinations of parameterizations. Data from 19 local meteorological stations and regional and global gridded were used for verification. It was concluded that all the configurations over...
6
artículo
Publicado 2018
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A sensitivity study of the performance of the Weather Research and Forecasting regional model (WRF, version 3.7) to the use of different microphysics, cumulus, and boundary layer parameterizations for short- and medium-term precipitation forecast is conducted in the Central Andes of Peru. Lin-Purdué, Thompson, and Morrison microphysics schemes were tested, as well as the Grell–Freitas, Grell 3d, and Betts–Miller–Janjic cumulus parameterizations.
7
artículo
Publicado 2015
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The objectives of this study were to describe the growth of young llamas by the application of four non-linear functions (Gompertz, Logistic, Von Bertalanffy and Brody), evaluate the importance of fixed (environmental) effects (sex, type of llama, month and year of birth) on growth curve parameters and finally estimate the genetic parameters for growth curve parameters (A: asymptotic body weight and k: specific growth rate). A total of 35,691 monthly body weight records from birth up to 16 months of age from 2675 young llamas, collected from 1998 to 2008 in the Quimsachata Experimental Station of the Instituto Nacional de Innovación Agraria (INIA) in Peru were used. Growth curve parameters were estimated by non-linear procedures while genetic parameters were estimated by application of a bivariate animal model and the restricted maximum likelihood (REML) method. All non-linear functions...
8
artículo
In the current era; of the cult to the body, to the health, to the image and to the wellbeing; one must have a vision of the patient in a more holistic way; in which, it is not only essential to consider the health and function of the teeth; but seek to achieve the greatest aesthetics of the smile considering the needs and expectations of patients. Therefore, in the present review we aim to know the perception of the aesthetic parameters that are most evaluated in the smile analysis; both by professionals, as by patients.
9
artículo
Publicado 2023
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We consider the adaptive finite element discretization of parameter estimation problems for nonlinear elliptic partial differential equations. The idea is to use a gradient method on the finite-dimensional parameter space for the minimization of the least-squares residual. Since the gradient involves solution of partial differential equations, it is not accesable, and is replaced by an approximation obtained by finite elements. This results into a perturbed gradient method. We use an (a posteriori) error estimator to control the accuracy of the gradient approximation and propose an algorithm, which links the estimator to the progress of the iteration. We show convergence of the algorithm under typical structural assumptions.
10
artículo
Publicado 2023
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We show the structure of the parameter space for a family of rational maps containing Blaschke products. Through numerical simulations using the orbit of a single critical point, we reveal the existence of infinitely many Mandelbrot-like sets along the unit circle, as well as eight-like structures in other regions of parameter space. We pose some open questions related to the parameter space of these functions.
11
artículo
This research focuses on the modeling of bounded surfaces using parameterizations based on cylindrical coordinates, which is one of the topics of the multivariable calculus course, where it seeks to develop modeling and problem-solving skills in real context, being essential for this to develop geometric skills that allow sketching graphs in space. Therefore, the main objective of the research was to present a modeling case of a sludge decanting tank, through cylindrical coordinates, using the GeoGebra software in its Suite version for mobile devices, in addition to interacting with augmented reality (GeoGebra AR). With this, a didactic, dynamic, and iterative form is proposed where the inter-action between mathematics, engineering and technology is evidenced, and seeks to improve the teaching-learning experience.
12
tesis de grado
Publicado 2021
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La región de Arequipa posee la mayor extensión del litoral peruano en el mar Pacífico, también posee recursos de agua dulce compuestos por ríos y lagunas desde la costa hasta la sierra de los Andes. El vehículo ALBA es una embarcación de superficie autónoma de bajo costo con arquitectura de código abierto que se está desarrollando para respaldar las tareas de monitoreo del agua en la región. Este artículo trata el problema de identificación no lineal para una nave autónoma de superficie y se utiliza el método de estimación de máxima verosimilitud para estimar sus parámetros. El modelo paramétrico no lineal se considera con datos experimentales y simulados. Los resultados muestran buenos valores de ajuste cuando se estiman dos, tres y un máximo de cuatro parámetros
13
objeto de conferencia
Publicado 2016
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Se propuso QIEA-R (Quantum Inspired Evolutionary Algorithm with Real Codification) para resolver problemas numéricos obteniendo mejores resultados en comparación con los algoritmos tradicionales de EAs, DE y PSO. Se inspira en el concepto de superposición cuántica para reducir el número de evaluaciones. QIEA-R tiene dos pasos importantes: inicialización de la población cuántica y actualización de la población cuántica. Este trabajo analiza estos dos pasos y parámetros relacionados: Tamaño de la población clásica, número de iteraciones, sobre algunas funciones de referencia utilizando mediciones estadísticas para evaluar su importancia y efecto en la calidad de convergencia. Los resultados muestran la importancia del tamaño de la población cuántica y la frecuencia de actualización.
14
artículo
Publicado 2009
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The age at first service (EPS), age at first calving (EPP), calving – first service interval (IPPS), calving – conception interval (IPC), inter-calving interval (IEP), number of services per conception (NSC), conception rate at first service (TCPS) and overall conception rate (TCG) were determined from historical data of 559 dairy cows from 4 intensive milk dairy farms in the Lima region. Variables under analysis were farm, calving season (summer: December–March; winter: April–August; spring: September–November) and parity (primmiparous; multiparous). EPS was 17.5 ± 0.1 months (n = 559), EPP was 27.2 ± 0.2 months (n = 455), IPPS was 109.2 ± 1.5 days (n = 1233), IPC was 181.1 ± 3.4 days (n = 1035), IEP was 15.2 ± 0.1 months (n = 775), NSC was 2.41, TCPS was 46.1% (66.9 and 36.5% en heifers and cows, respectively) and TCG was 41.5%. IPPS of cows that calved in winter was sta...
15
artículo
Publicado 2021
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The purpose of this study was to develop and test a methodological approach to optimizing the business processes of the leather industry company of the Republic of Iraq on the basis of a series of sequential steps, including both assessing the individual parameters of the differentiation of the competitive strategy and identifying problem areas for further setting up business processes. The results of the study are expressed in the form of developing an author's algorithm for identifying competitiveness parameters in accordance with the type of competitive strategy, as well as in the form of developing a matrix for determining a competitive strategy. By summarizing the scientific research, the authors presented for scientific consideration the main parameters of differentiation of the business model of leather products, as well as the analytical scheme of cost analysis in relation to the...
16
artículo
Publicado 2019
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The objective of this study was to determine the hematological values of Brycon amazonicus broodstock under culture in Iquitos, Peru. Blood samples were taken from 12 specimens (1.62 ± 0.45 kg and 51.38 ± 2.93 cm) maintained in earthen ponds and fed twice a day with a commercial diet with 22% crude protein. The fish were collected with a net and anesthetized with eugenol. Blood extraction was performed with disposable syringes containing EDTA (10%). The values obtained from the erythrocytic series were: hematocrit 53.3 ± 4.8%; hemoglobin 20.1 ± 3.2 g/dl; erythrocytes 2.8 ± 0.5 x106/μl; VCM 194.4 ± 54.4 fl; CHCM 37.7 ± 4.8 g/dl; HCM 72.6 ± 17.7 pg. The number of leukocytes was 8.1 ± 6.0 x103/μl. In the differential count of leukocytes, the lymphocytes and monocytes had greater proportion in comparison with neutrophils, eosinophils and basophils. The total serum protein was 3.7 ...
17
artículo
Publicado 2013
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The present research was conducted in order to determine the parameters of production and conservation of adult bovine rennet. Dry abomasum was chunked and proceeded to the extraction of the enzyme with hydrochloric acid 3 mM, pH 2,5. Was activated enzyme solution and filtered to yield the liquid rennet with 1:607,59 force (± 1,58) Soxhlet Units. Liquid rennet was filled in low density polyethylene milky white bottles and stored for one month at 4°C, -7°C and -198°C, to later evaluation. The strength of liquid rennet in storage at 4°C did not yield good results, because loss of the 38,47% of force. Stored liquid rennet to temperature of -7°C, generated a power loss of 30,94%, being the basal strength of 1:419,58 (± 1,47) in U.S. (Units Soxhlet). Storage of liquid rennet to -198°C (liquid nitrogen), was appropriate to preserve with power loss.
18
artículo
Publicado 2021
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The purpose of this study was to develop and test a methodological approach to optimizing the business processes of the leather industry company of the Republic of Iraq on the basis of a series of sequential steps, including both assessing the individual parameters of the differentiation of the competitive strategy and identifying problem areas for further setting up business processes. The results of the study are expressed in the form of developing an author's algorithm for identifying competitiveness parameters in accordance with the type of competitive strategy, as well as in the form of developing a matrix for determining a competitive strategy. By summarizing the scientific research, the authors presented for scientific consideration the main parameters of differentiation of the business model of leather products, as well as the analytical scheme of cost analysis in relation to the...
19
artículo
The use of organic waste as fuel for energy generation will reduce the great environmental problems currently caused by the consumption of fossil sources, giving agribusiness companies a profitable way to use their waste. In this research, tomato waste with different percentages of sucrose (0-target, 5, 10, and 20%) was used in microbial fuel cells manufactured on a laboratory scale with zinc and copper electrodes, managing to generate maximum peaks of voltage and a current of 1.08 V and 6.67 mA in the cell with 20% sucrose, in which it was observed that the optimum operating pH was 5.29, while the MFC with 0% (target) sucrose generated 0.91 V and 3.12 A on day 13 with a similar pH, even though all the cells worked in an acidic pH. Likewise, the cell with 20% sucrose had the lowest internal resistance (0.148541 ± 0.012361 KΩ) and the highest power density (224.77 mW/cm2) at a current d...
20
artículo
“The use of organic waste as fuel for energy generation will reduce the great environmental problems currently caused by the consumption of fossil sources, giving agribusiness companies a profitable way to use their waste. In this research, tomato waste with different percentages of sucrose (0-target, 5, 10, and 20%) was used in microbial fuel cells manufactured on a laboratory scale with zinc and copper electrodes, managing to generate maximum peaks of voltage and a current of 1.08 V and 6.67 mA in the cell with 20% sucrose, in which it was observed that the optimum operating pH was 5.29, while the MFC with 0% (target) sucrose generated 0.91 V and 3.12 A on day 13 with a similar pH, even though all the cells worked in an acidic pH. Likewise, the cell with 20% sucrose had the lowest internal resistance (0.148541 ± 0.012361 KΩ) and the highest power density (224.77 mW/cm2 ) at a curr...
