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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
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.
8
artículo
Publicado 2017
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Fifteen sampling stations were evaluated in streams and rivers in the influence area of the pipeline PERÚ LNG in the departments of Ica and Huancavelica, for this physicochemical parameters of water were taken, habitat type described and aquatic macroinvertebrates were collected. The results of physicochemical parameters were acceptable to the development of aquatic macroinvertebrates, with dissolved oxygen values below the legal regulations in the Matagente and Pisco rivers during the dry season (May, 2010), which also aquatic macroinvertebrates were composed of 34 taxa, with a 3671 total abundance of organisms/m2, unlike the wet season (November, 2010), where aquatic macroinvertebrates were composed of 26 taxa, with a total abundance of 1623 organisms/m2. The most representative organisms were arthropods, mainly those belonging to the class Insecta. The stations between 3985 and 4210 ...
9
artículo
Publicado 2012
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The prime numbers motivate the investigation in number theory; nowadays, does not exist a formula that allows get those numbers, and that the distribution thereof is considered random. There are methods to find whether a number is prime or composite. This article presents a characterization of prime numbers which is the complement of composite numbers.
10
artículo
Publicado 2012
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The prime numbers motivate the investigation in number theory; nowadays, does not exist a formula that allows get those numbers, and that the distribution thereof is considered random. There are methods to find whether a number is prime or composite. This article presents a characterization of prime numbers which is the complement of composite numbers.
11
artículo
Publicado 2019
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Considering reproductive health as an important component of animal welfare in dogs, the purpose of this study was to characterize and compare some reproductive health parameters in 30 intact English Bulldog, clinically healthy, distributed in two age groups: A, 1-4 years (n = 15) and B: ≥5 years (n = 15). The evaluation was carried out through a reproductive physical examination and testicular and prostate ultrasonographic examination. The average age of groups A and B was 2.19 ± 1.08 years and 7.31 ± 3.12 years, respectively. In total, 16.6% of the specimens presented urethral prolapse without differences by age group. The frequencies of asymmetry and testicular flaccidity were 0.06 in both groups. The ultrasonographic evaluation showed a higher frequency of alterations of the testicular parenchyma, especially heter...
12
artículo
Publicado 2019
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Considering reproductive health as an important component of animal welfare in dogs, the purpose of this study was to characterize and compare some reproductive health parameters in 30 intact English Bulldog, clinically healthy, distributed in two age groups: A, 1-4 years (n = 15) and B: ≥5 years (n = 15). The evaluation was carried out through a reproductive physical examination and testicular and prostate ultrasonographic examination. The average age of groups A and B was 2.19 ± 1.08 years and 7.31 ± 3.12 years, respectively. In total, 16.6% of the specimens presented urethral prolapse without differences by age group. The frequencies of asymmetry and testicular flaccidity were 0.06 in both groups. The ultrasonographic evaluation showed a higher frequency of alterations of the testicular parenchyma, especially heter...
13
artículo
Publicado 2009
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Aqueous extractions were performed controlling the pH with CaCO3 and Ca(OH)2, using as clarifiers activated coal and activated clays in cold and warm solutions to obtain best results with cold bentonite, warm activated clay and warm activated coal. Analytical results were compared with a commercial sample of stevia.
14
artículo
Publicado 2020
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This work describes Information and Communication Technologies (ICT) in Peruvian companies according to the 2015 Enterprise Survey made by the National Statistical Institute (INEI). It has been chosen variables related to companies and ICTs to describe their use in the business management of companies in Peru. STATA software has been used to systematize and analyze the data with revealing results. This research will serve as the basis for other correlational and causal research.
15
artículo
Publicado 2015
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This work offers a quick description of the vowels and consonants of the Bora language. It also explains the linguistic and sociolinguistic criteria for the selection of graphemes in the Bora language: it highlights the importance of the written tradition for the selection of certain graphemes, such as <c> and <k> or the removal of <s> and <z>. Finally, this work discuss the presence of long vowels in the Bora language: evidence to date suggests that the Bora language has only short vowels thanks to the processes of derivation with tone in the nominal Bora lexicon
16
artículo
Publicado 2009
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Aqueous extractions were performed controlling the pH with CaCO3 and Ca(OH)2, using as clarifiers activated coal and activated clays in cold and warm solutions to obtain best results with cold bentonite, warm activated clay and warm activated coal. Analytical results were compared with a commercial sample of stevia.
17
artículo
Publicado 2021
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The writing of a screenplay for an animated film for children is a delicate process due to several factors: the nature of a script, whose goal is not only to be written, but must also be produced to fulfill its purpose; the high costs of audiovisual production, which oblige it to include commercial values in its poetics to guarantee a recovery of the large investment; the demands of a highly segmented public, such as children; and the demands of a society that expects high commercial values from cultural industries. In this sense, the main goal of this article is to propose a characterization of children’s animation cinema based on three axes: the commercial (in order to meet the audience’s requirements), the authorial (in order to respect the author’s poetics) and the hybrid (which balances both interests). To achieve this, a theoretical framework oriented to mass culture based on...
18
artículo
Publicado 2021
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The COVID-19 pandemic has caused human beings to rethink their connection with nature, because this 21st century, even with the greatest approach to environmental issues worldwide, is also a reality that the attitudes of political and social leaders they are insufficient, which means that the balance with nature continues to be broken. Therefore, the importance of knowing the environmental attitudes of the student community, who will assume the reins of future national projects, including environmental ones. The purpose of this study is to identify the levels of environmental attitude in university students. The sample consisted of 128 subjects from the professional schools of Veterinary Medicine and Sports Sciences of a private university in Metropolitan Lima. The research has a quantitative approach and a comparative descriptive design. To measure environmental attitude, a Likert-type ...
19
artículo
Publicado 2021
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El objetivo de este estudio fue caracterizar las principales situaciones de indicación, contraindicación y accionar profiláctico para la exodoncia de terceros molares, según la literatura. Se utilizaron las bases de datos PubMed, Scopus y Web of Science, con un total de 3 llaves de búsqueda, y se incluyeron publicaciones de máximo 5 años de antigüedad, en inglés o español, con disponibilidad de texto completo. Fueron seleccionados 18 artículos, en los que se determinó que la indicación más frecuente en la exodoncia de terceros molares fue el diagnóstico de pericoronaritis, seguido de caries cervical distal en segundo molar inferior, reabsorción radicular en dientes adyacentes y quistes. A su vez, puede estar indicada para facilitar otros tipos de tratamientos dentales, como ortodoncia, cirugía ortognática y rehabilitación. En cuanto a las contraindicaciones, predominó...
20
artículo
Publicado 2006
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New thermo-responsive graft copolymer s and hydrogelswere synthetized. The graft copolymer were synthesized bythe cationic ring-opening polymerizatio n of 2-methyl-2-oxazoline (MeOXA) , or 2-ethyl-2-oxazoline (EtOXA), respectively, initiated by the random copolymer s ofchloromethylstyren e (CMS) and N-isopropylacrylamide(NIPAAm) using the “grafting from” method with a yield of 66to 94%1. The polymers were characterized by NMR, GPC andDSC and the conformational transition (Lower Critical SolutionTemperature-LCST) of macroinitiators and graft copolymerswas determined by the turbidity and DSC measurements. Thetransition temperature of the graft copolymers could be finetunedthrough the composition of the macroinitiator and the graft copolymer. An increasing quantity of the hydrophobiccomonomer chloromethylstyrene in the macroinitiator lowered its LCST, while in the graft copolymer an inc...
