bluuebunny/crossref_metadata_2025 huggingface dataset:
Relações governamentais no plano estratégico da Marinha priorização de recomendações por processo de análise hierárquica
Authors: Gildes Borges Alexandre , Gavião Luiz Octávio
Published: August 2023

O artigo propõe uma ordem prioritária de recomendações estratégicas na área de Relações Governamentais, alinhadas ao Plano Estratégico da Marinha (PEM 2040). As Relações Governamentais, sua estrutura e recomendações práticas constituem uma lacuna no PEM e seu aperfeiçoamento corresponde ao problema de pesquisa. Foram consideradas seis recomendações estratégicas: mapeamento de stakeholders; mapeamento das competências do profissional na área de Relações Governamentais; envolvimento da área de Relações Governamentais nas iniciativas estratégicas; gestão interna e externa dos resultados da área Relações Governamentais; uso conjunto de uma estratégia que reúne as diferentes características das Relações Governamentais (jurídica, técnica, ética, cultural, entre outras), submetidos a processo de elaboração de diagnóstico e solução do problema; e avaliação da senioridade e transversalidade da área de Relações Governamentais na estrutura organizacional da Marinha do Brasil. Para a modelagem foi utilizado o método da Análise Hierárquica de Processos, que explora avaliações psicométricas e baseadas em experiências de especialistas. A estrutura hierárquica do problema contém cinco critérios: confiança, compromisso, satisfação, influência mútua, e transparência organizacional. A coleta de dados envolveu o uso de questionário, com especialistas da Marinha. A recomendação do uso conjunto de uma estratégia que reúne as características das Relações Governamentais obteve a maior prioridade para implementação.
Conflitos ambientais envolvendo comunidades pesqueiras na APA de Guapimirim/ESEC da Guanabara - Baía de Guanabara/RJ
Authors: dos Santos Moysés Yana , Nuñez Viégas Rodrigo
Published: August 2023

O presente trabalho analisa os conflitos ambientais que envolvem as comunidades pesqueiras na Baía de Guanabara, com um olhar especial nas áreas de jurisdição da Área de Preservação Ambiental (APA) de Guapimirim e Estação Ecológica (ESEC) da Guanabara. Verifica-se a necessidade de trabalhos que buscam fazer uma análise mais sistemática dos conflitos existentes entre órgãos públicos ambientais e pescadores e, com isso, de dados que possam auxiliar na proposta de políticas públicas democráticas e sustentáveis. A partir disso, a pesquisa parte de dois planos de investigação análise documental e entrevistas- com centralidade na análise e no tratamento dos Autos de Infração emitidos pelos agentes fiscalizadores do ICMBio no período de 2010 a 2022. Esse trabalho busca assim contribuir com o poder público na ampliação e atualização de uma base de informações que busca subsidiar tanto os órgãos públicos, como os pescadores, no diagnóstico das situações conflitivas e na criação de estratégias práticas de enfrentamento dos quadros de desigualdade ambiental mediante a criação/aperfeiçoamento de mecanismos de controle, licenciamento e fiscalização.
Stochastic modeling of spatial dependency structures of extreme precipitation in the Northern Great Plains using max-stable processes
Authors: Boluwade Alaba
Published: August 2023

The objective of this study is to quantify the spatial dependency and trend of annual maxima precipitation (annual highest daily precipitation, from 1970 to 2020) across selected weather stations in the Nelson Churchill River Basin (NCRB) of North America. This study uses max-stable processes to examine spatial extremes of annual maxima precipitation. The generalized extreme value (GEV) parameters are expressed as simple linear combinations of geographical coordinates (i.e., longitude and latitude) and topography. The results show that topography, geographical coordinates, and time (as a temporal covariate) were important covariates in reproducing the stochastic extreme precipitation field using the spatial generalized extreme value (SPEV). The inclusion of time as a covariate further confirms the impacts of climate change on extreme precipitation in the NCRB. The fitted SPEV was used to predict the 25- and 50-year return period levels. The fitted Extremal-t max-stable process model captured the spatial dependency structure of the extreme precipitation in the NCRB. The study is relevant in quantifying the spatial dependency structure of extreme precipitation in the Northern Great Plains. The result will contribute as a decision-support system in climate adaptation strategies in the United States and Canada.
Equity analysis of intermittent water supply systems by means of EPA-SWMM
Authors: Ceita Paulo A. S. B. , Mahamed Ismail Mahamud , Ferras David , Trifunović Nemanja , Kennedy Maria
Published: August 2023

Intermittent water supply (IWS) is a frequent operation approach in developing countries. A number of factors contribute to IWS, such as leakage and water shortage, leading to inequitable water distribution. A way to reduce the inequity in IWS systems is by planning or adapting the network for equitable water distribution, which requires software capable of describing IWS conditions, including not only pressurized flow but also free-surface. In this paper, a new index for equity analysis is presented and compared with the existing indices available in scientific literature. The comparison is based on the EPA-SWMM modelling framework and standard IWS operations, including pipe emptying and filling, have been considered. Results reveal that EPA-SWMM has great potential in simulating IWS systems, especially in the application for equity analyses, as it provides a more realistic description of the pipe filling and emptying operations compared to standard water distribution modelling software. Furthermore, a novel equation called volumetric coefficient was developed which has a significant advantage in identifying the nodes with a higher impact on network equity, and ensuring the fair distribution of supply along the distribution network, considering the relevance of nodal demand, which none of the other indexes in the literature were addressed.
Consumo Sustentável de Alimentos: Perfil do Consumidor Gaúcho de Leite Orgânico e Derivados
Authors: Cyrne Carlos Cândido da Silva , Feil Alexandre André , Sindelar Fernanda Cristina Wiebusch , Barden Júlia Elisabete , Dalmoro Marlon , Danieli Rafaela
Published: August 2023

Os alimentos orgânicos têm seu consumo em crescimento contínuo em nível global, especialmente nas duas últimas décadas, no entanto, a literatura ainda não compreende, na totalidade, os seus drivers, especialmente em regiões periféricas. Neste contexto, este estudo objetiva analisar o perfil e as variáveis intervenientes que influenciam no consumo de leite orgânico e derivados no Estado do Rio Grande do Sul, Brasil. A metodologia utilizada vincula-se a quantitativa, por meio da aplicação de um questionário fechado, junto a unidade de análise de 1.997 consumidores de alimentos orgânicos, sendo que entre estes 424 consomem leite orgânico ou derivados. A confiabilidade das respostas foi apurada com base no alfa de cronbach, já a homogeneidade foi aferida por meio dos testes de Kolmogorov Smirnov e Shapiro-Wilk. Para verificar a força e a direção entre variáveis utilizou-se o teste de Pearson. A análise dos resultados, aponta para um perfil prevalente de mulheres solteiras, sem filhos, de nível superior incompleto, entre 21 e 30 anos. As motivações para o consumo são principalmente a produção sem químicos e em função da saúde. Por fim discute-se a importância de compreender o comportamento do consumidor de orgânicos a partir de olhares regionalizados e considerando o tipo de produto de forma a subsidiar o desenvolvimento de modelos agroalimentares mais sustentáveis.
Partição de Chuva e Nível Freático em uma Floresta Ripária Tropical nos Domínios da Savana Brasileira
Authors: Brito Gleicon Queiroz de , Murta Johnny Rodrigues de Melo , Salemi Luiz Felippe
Published: August 2023

As florestas ripárias contribuem com diversos serviços ecossistêmicos, tais como filtragem de poluentes, controle de erosão, influencia na qualidade da água, entre outros. No entanto, pouco se sabe a respeito do funcionamento hidrológico das florestas que ladeiam os corpos d’água na região da savana brasileira. O objetivo deste trabalho foi caracterizar a partição de chuva e o nível do lençol freático em uma floresta ripária tropical situada nos domínios da savana brasileira. Para isso, mediu-se a precipitação, precipitação interna, interceptação do dossel, interceptação da serrapilheira e o nível do lençol freático. O volume da precipitação, da precipitação interna e, da interceptação do dossel foram, respectivamente, 1685 mm, 1440 mm (85,5%) e, 245 mm (14,5%). No mesmo período, a interceptação da serrapilheira foi de 59,1%. Já o nível do lençol freático teve média de 33,4 cm, com maior aproximação da superfície do solo no período úmido (média de 27,8 cm) do que no período seco (média de 64,3 cm).
Alkaloids as Vasodilator Agents: A Review
Authors: Amssayef Ayoub , Eddouks Mohamed
Published: August 2023

The pathophysiology of hypertension is often associated with endothelial dysfunction and the impairment
of endothelium-dependent vasodilation mechanisms, as well as alterations in vascular smooth muscle (VSM)
tone. Natural products, particularly alkaloids, have received increased attention in the search for new vasodilator
agents. This review aims to summarize the noteworthy results from ex-vivo and in-vitro studies that explored
the vasodilatory effects of some selected alkaloids (Berberine, Sinomenine, (S)-Reticuline, Neferine, Nuciferine,
Villocarine A, 8-Oxo-9-Dihydromakonakine, Harmaline, Harman, and Capsaicin) and the underlying
mechanisms implicated. The results obtained from the literature revealed that these selected alkaloids exhibited
vasodilation in various vascular models, including mesenteric, carotid, and coronary arteries, thoracic aorta,
and cultured HUCECs and VSMCs. Furthermore, most of these alkaloids induced vasodilation through endothelium-
dependent and endothelium-independent mechanisms, which were primarily mediated by activating
eNOS/NO/sGC/cGMP pathway, opening various potassium (K+) channels, or modulating calcium (Ca2+) channels.
Additionally, several alkaloids exerted vasodilatory effects through multiple mechanism pathways. Moreover,
different alkaloids demonstrated the ability to protect endothelial function by reducing oxidative stress, endoplasmic
reticulum and inflammation. In conclusion, this class of secondary metabolites holds interesting therapeutic
potential in the prevention and treatment of cardiovascular diseases (CVD), particularly hypertension.
Functional Chitosan: Recent Gamma Radiation Chemistry of Organic Derivatives
Authors: Torres Maykel González
Published: August 2023

This Special Issue will cover the recent radiation chemistry of chitosan (CS) and the attempts that researchers have made to prepare a plethora of derivatives for diverse synthetic applications. The cutting-edge science carried out by experts regarding the gamma-radiation-induced synthesis methods, types of monomers used for grafting the CS, and enhanced properties of the new organic compounds are provided here.
Neural Oscillation Disorder in the Hippocampal CA1 Region of Different
Alzheimer's Disease Mice
Authors: Yuan Weiming , Zhi Weijia , Ma Lizhen , Hu Xiangjun , Wang Qian , Zou Yong , Wang Lifeng
Published: August 2023

Background:

Alzheimer's disease (AD) is a well-known neurodegenerative disease that
gradually induces neural network dysfunction and progressive memory deficits. Neural network activity
is represented by rhythmic oscillations that influence local field potentials (LFPs). However,
changes in hippocampal neural rhythmic oscillations in the early stage of AD remain largely unexplored.

Objective:

This study investigated neural rhythmic oscillations in 3-month-old APP/PS1 and 5x-
FAD mice to assess early neural connectivity in AD.

Methods:

LFPs were recorded from the hippocampal CA1 region with implanted microelectrode arrays
while the mice were in the awake resting stage. Welch fast Fourier transforms, continuous
wavelet transforms, and phase-amplitude coupling analyses were used to compute the power density
of different frequency bands and phase-amplitude modulation indices in the LFPs.

Results:

Our results showed impaired theta, low gamma, and high gamma frequency band power
in APP/PS1 and 5xFAD mice during the awake resting stage. AD mice also showed decreased delta,
alpha, and beta frequency band power. Impaired theta-low gamma and theta-high gamma phaseamplitude
coupling were observed in 5xFAD mice.

Conclusion:

This study revealed neural network activity differences in oscillation power and
cross-frequency coupling in the early stage of AD, providing a new perspective for developing biomarkers
for early AD diagnosis.
Peripheral Neuroinflammation and Pain: How Acute Pain Becomes
Chronic
Authors: Schumacher Mark A.
Published: August 2023

The number of individuals suffering from severe chronic pain and its social and financial
impact is staggering. Without significant advances in our understanding of how acute pain becomes
chronic, effective treatments will remain out of reach. This mini review will briefly summarize how
critical signaling pathways initiated during the early phases of peripheral nervous system inflammation/
neuroinflammation establish long-term modifications of sensory neuronal function. Together with
the recruitment of non-neuronal cellular elements, nociceptive transduction is transformed into a pathophysiologic
state sustaining chronic peripheral sensitization and pain. Inflammatory mediators, such
as nerve growth factor (NGF), can lower activation thresholds of sensory neurons through posttranslational
modification of the pain-transducing ion channels transient-receptor potential TRPV1 and
TRPA1. Performing a dual role, NGF also drives increased expression of TRPV1 in sensory neurons
through the recruitment of transcription factor Sp4. More broadly, Sp4 appears to modulate a nociceptive
transcriptome including TRPA1 and other genes encoding components of pain transduction. Together,
these findings suggest a model where acute pain evoked by peripheral injury-induced inflammation
becomes persistent through repeated cycles of TRP channel modification, Sp4-dependent overexpression
of TRP channels and ongoing production of inflammatory mediators.
WITHDRAWN: Pharmacognostic and Pharmacolgical Profile of Amomum subulatum, ‘Black Cardamom’
Authors: Singh Sonia , Pandey Swapnil , Sharma Shiwangi
Published: August 2023

Since the authors are not responding to the editor’s requests to fulfill the editorial requirement, therefore, the article has been
withdrawn.

Bentham Science apologizes to the readers of the journal for any inconvenience this may have caused.

The Bentham Editorial Policy on Article Withdrawal can be found at https://benthamscience.com/editorial-policies-main.php

BENTHAM SCIENCE DISCLAIMER:

It is a condition of publication that manuscripts submitted to this journal have not been published and will not be simultaneously
submitted or published elsewhere. Furthermore, any data, illustration, structure or table that has been published elsewhere
must be reported, and copyright permission for reproduction must be obtained. Plagiarism is strictly forbidden, and by submitting
the article for publication the authors agree that the publishers have the legal right to take appropriate action against the
authors, if plagiarism or fabricated information is discovered. By submitting a manuscript the authors agree that the copyright
of their article is transferred to the publishers if and when the article is accepted for publication.
Design, Development, and In vitro Evaluation of Single Unit Hydrodynamically
Balanced System of Captopril
Authors: Soni Shashank , Bahuguna Deepankar
Published: August 2023

Background:

This study investigated the use of in situ polyelectrolyte complex formation by using two oppositely charged polysaccharides [Chitosan (cationic), Sodium Alginate (anionic)]. It forms 3-D intercalation and interpenetrating network helping in controlling the release of highly acid-soluble Captopril.

Objective:

To develop a polyelectrolyte complex based single unit gastroretentive tablet by using optimization based 3 (2) Taguchi factorial design for controlled delivery of Captopril.

Materials and Methods:

Gastroretentive Captopril tablets were prepared by the direct compression technique. Total 09 batches were prepared as per 3 (2) Taguchi factorial design studies of 100 tablets each.

Results:

Thermal analysis method revealed that there is a formation of PEC between chitosan and sodium alginate. In vitro buoyancy and T60%, drug release studies revealed that due to complex formation, formulation remains stable and remains buoyant. From factorial design studies, it was interpreted that for buoyancy time (Y1) chitosan desired effect value was found higher. For 60% drug release (T60%; Y2) both chitosan and sodium alginate have a synergistic effect. Durbin Watson's statistical model and residual data suggested that the model is statistically validated. All formulations follow the zero-order kinetics. Stability studies revealed that formulations F5 and F9 remain stable for long-term stability studies without showing any significant changes. The fit analysis studies indicated that the prepared formulation was different from the innovator product indicating low f1 and f2 values.

Conclusion:

From the result generated it was concluded that chitosan-sodium alginate polyelectrolyte complex has sufficient potential to retard the release of CPT.
Understanding Nucleophilicity of Pyridine-N-oxides Towards
2,4,6-Trinitrophenylbenzoate Through Simple Absorption Spectroscopic
Studies
Authors: Mawrie Ladapborlang , Rahman Fazlur , Gazi Sarifuddin
Published: August 2023

Aims:

Understanding nucleophilicity of poor nucleophiles like pyridine-N-oxides.

Background:

Nucleophilicity plays a vital role in substitution reactions. It helps to determine the possibility and extent of the substitution reactions. The study of the nucleophilicity of poor nucleophiles is challenging, and it has limited substrate scope. Understanding the strength of nucleophilicity of such poor nucleophiles in a quantitative way is important.

Objective:

Understanding the strength of nucleophilicity of such poor nucleophiles in a quantitative way. Selection of appropriate electrophile for the reactions with the poor nucleophiles-pyridine-N-oxides. Development of suitable methodology for kinetic studies of the reaction.

Methods:

UV-Vis spectroscopic methods for monitoring the reactions.

Results:

The kinetic studies revealed that the second-order rate constants of the nucleophilic reactions are 1.67× 102 L mol-1 min-1, 29.8 L mol-1 min-1, 29.51 L mol-1 min-1, where the nucleophiles are p-methylpyridine-N-oxide, pyridine-N-oxide, and p-nitropyridine-N-oxide, respectively. The UV-Vis spectroscopic analysis revealed the nucleophilicity of p-methylpyridine-N-oxide > pyri-dine-N-oxide > p-nitropyridine-N-oxide.

Conclusion:

This comparative study suggests that the strength of nucleophilicity of the p-methylpyridine-N-oxide is 5.6 times and 66.53 times more than that of pyridine-N-oxide and p-nitropyridine-N-oxide, respectively, whereas the strength of nucleophilicity of the pyridine-N-oxide is 11.87 times more than that of p-nitropyridine-N-oxide.
My Quarantine Diary: A Tool for Self-care and Learning about COVID-19
Authors: da Costa Luana Michelly Aparecida , Aguilar Guilherme José , dos Santos Luiz Ricardo Albano , Lemos Costa Wilbert Dener , de Castro Barros Donato Dantony , Foresto Felipe , Bollela Valdes Roberto , de Oliveira Alan Maicon
Published: August 2023

Background:

Self-care and self-education are essential for maintaining the health of the population,
mainly in the pandemic scenario as established by COVID-19, where social distancing and avoiding
agglomeration in closed environments is strongly recommended, as well as preventing the spread of
fake news.

Objective:

This study aimed to describe the development and implementation of a self-care and learning
application related to COVID-19.

Methods:

In 2020, right at the beginning of the pandemic, a multidisciplinary team at the University of
São Paulo -Brazil, was formed to develop a technological platform called Meu Diário de Quarentena®
(My Quarantine Diary). In this environment, information on self-care, self-monitoring, and health education
was made available to people facing the challenges of the COVID-19 pandemic. The tools, including
HTML, CSS, PHP, and MySQL database manager, were used.

Results:

Meu Diário de Quarentena® (My Quarantine Diary) platform allowed each person to make their
own assessment and keep a follow-up of signs and symptoms of COVID-19 through a diary that analyzed
the clinical presentation, provided guidance, and suggested an action in real-time to reduce stress and
worries. A diagnostic support algorithm was implemented to mitigate false alarms and highlight the importance
of caring for family members when an infection was suspected. Furthermore, people were
trained with an interactive quiz to promote health education and to offer relevant and updated information
related to the pandemic, which contributed to preventing the spread of fake news.

Conclusion:

A website application (web app) for screening signs and symptoms, self-care, selfmonitoring,
and promoting health education related to the COVID-19 pandemic was developed and made
available on the network. The entire population was given access to Meu Diário de Quarentena® (My
Quarantine Diary).
Naturally Occurring Chromene Containing Molecules and their Isolation Protocols
Authors: Kumar Rath Santosh , Ramkar Shweta , Suresh Preeti K.
Published: August 2023

Natural products have been used as major sources of therapeutic agents in
drug discovery since the ancient eras. Natural products have been widely studied in the
physical and biological sciences, including nutrition, health, bio-medical, and other
interrelated sciences. Because of their unique chemical diversity and bioactivity, they
have continued to offer templates for the development of novel forms of drugs. In the
field of traditional medicine, natural products have been used for a very long time in
the form of decoctions, medicinal extracts, infusions, or other therapeutic preparations.
Chromene is one of the essential chemical constituents, derived from the conversion of
multiple biosynthetic pathways present in the plant as well as animal kingdoms, which
represents a remarkable group of structurally varied secondary metabolites. The
scaffold is considered an important class of oxygenated heterocyclic compounds as two
forms of 2H/4H-chromene (2H/4H-Ch) with versatile biological profiles. Chromenes
are the basic backbone of various polyphenols, alkaloids, tocopherols, anthocyanins,
etc. Crotin, Crotaramine, Dysoline, Malachromone, Oxalicumones A-C, Khellin,
Baicalin, Diosmin, etc. are some examples of naturally isolated chromene fused
compounds that are reported for the treatment of diverse health ailments. Their unique
structure and varied pharmacological activities may provide new leads for the
discovery of drugs with their action. In recent years, the need to develop effective and
selective methods for the extraction and isolation of new natural products has been
increasingly felt. This chapter presents the extraction, isolation, and characterization
processes of the chromenes by the natural sources, illumination of the structures of
purified chromenes, and their bioactivity.
Chromene Derivatives as Potassium Channel Openers or Inhibitors
Authors: Mukherjee Krittika , Panwar Vivek , Kumar Jindal Deepak , Kumar Sandeep , Dhamija Isha , Kumar Deepak , Kumar Dash Ashutosh
Published: August 2023

This overview depicts the voltage-regulated potassium channel, which is
found in the CNS, and the emerging therapeutic applications of potassium channel
modulators. It also discusses the recent developments in our understanding of the
mechanisms, that control the activity of a series of channels, that are selective for
potassium ions. It has been long recognized that the excitability of cells is mediated by
proteins, which can modulate the ability of potassium ions to travel across the cell
membrane. Going back ten years, it has become increasingly clear that, potassium ion
channels represent an excellent target for novel drug design. Investigating the role of
potassium channels in treating human diseases continues to be a growing field of
research. The ability of potassium channels to regulate membrane potential accords a
central role in varied cellular processes that govern excitability, action potential
characteristics, stimulus secretion coupling, cell volume regulation, and epithelial
electrolyte transport. Attention from medicinal chemists to potassium channels as drug
targets has grown with the realization that a variety of potassium channel openers offer
significant therapeutic opportunities in cardiac, smooth muscle, neuronal, immune, and
secretary systems. Progressive improvements in molecular biology have enabled
regular cloning of potassium channels of interest, and defined families of these
channels have facilitated a comprehensive understanding of their function. Importantly
many families of increasingly selective small molecules have emerged as target
validation and clinical proof of principle. Many reviews have appeared summarizing
the synthesis and therapeutic potential of these channels. The scope of this report is to
make you aware of potassium channel biology, which leads to a more expedient identification of agents for the treatment of CNS disorders, emphasizing developments in
medicinal chemistry based on potassium channels where modulators would have
considerable clinical potential. While every effort has been made to include all relevant
reports in this discussion, any omission is inadvertent and we apologize for the same.
Application of Carbonaceous Quantum Dots in Biomedical
Authors: García Yarima S.
Published: August 2023

Numerous research fields, including chemistry, electronics, and medical
sciences, have concentrated on the production and use of novel functional
nanomaterials. Carbon, a component of all organic life forms, is essential for the
creation of nanomaterials. The modern carbon-based family component known as
carbonaceous quantum dots (CQD) was unintentionally discovered in 2004 while
single-walled carbon nanotubes were being purified. Additionally, CQDs have
exceptional qualities like outstanding photoluminescence and minimal toxic effects.
Outstanding in vitro andin vivo biomedical implications of CQDs include drug/gene
delivery, biosensor biotherapy, and theragnostic evolution. Also, CQDs can pass
through specific body sites of endothelial inflammation (epithelium of the intestinal
tract, liver, for example), tumors or penetrate capillaries due to their small size. For the
same reason, nanoparticles are more suitable for intravenous administration than
microparticles and also prevent particle aggregation and bypass emboli or thrombi
formation. This chapter describes the most contemporary applications of CQDs in
diverse biomedical fields. We hope it will provide incalculable insights to inspire
discoveries on CQD and delineate a road map toward a broader range of bio
applications.
Diseño y simulación de un circuito integrado de una red neuronal aplicado al control de velocidad de motores DC
Authors: Utrilla Salazar Darío
Published: August 2023

El objetivo de este trabajo, es el desarrollo de un dispositivo integrado, que permite controlar la velocidad de un motor de corriente continua (DC), utilizando una red neuronal. En el presente informe se describe un diseño desarrollado para controlar este tipo de motores DC utilizando el método de entrenamiento con algoritmos de retropropagación a través de la planta. Asimismo considerando que se puede entrenar a una red neuronal para controlar un proceso dinámico con parámetros variables. Plasmando en un dispositivo físico de un circuito integrado desarrollado con herramientas de diseño digital avanzado.
Evaluación de la influencia de la preparación de superficie en el comportamiento de los recubrimientos anticorrosivos mediante ensayo de niebla salina
Authors: Paucar Cuba Karin , Quispe Rosadio Calos , Diaz Vaca Michael , Cáceres Fernando , Vergara Sotomayor Abel
Published: August 2023

En el siguiente artículo se presenta los resultados obtenidos de la evaluación delcomportamiento anticorrosivo de sistemas de pinturas de uso en la industria nacional, sistemasepóxicos; utilizando el ensayo acelerado de niebla salina (ASTM B 117). El ensayo se realizópor un periodo de exposición de 125 días ó 3000 horas. Los sistemas de pinturas ensayadosfueron aplicados sobre placas de acero con diferentes tipos de preparación de superficie:manual, mecánico y arenado (al blanco, en seco y en húmedo). La evaluación de las muestrasensayadas se realizó según los criterios de las normas correspondientes: Grado de Oxidación,Ampollamiento y Deterioro en la Incisión. El grado de deterioro en la incisión permitióobservar que los sistemas epóxicos con preparación de superficie de arenado muestran unamayor resistencia al deterioro en la incisión, comparados con los de preparación de superficiede limpieza manual y limpieza mecánica.
Adecuación de la plataforma J2EE para construcción de un sistema de monitoreo y diagnóstico de fallas en motores AC utilizando ondículas y MPT
Authors: Bravo Vecorena Aland , Rojas Cerna Victor , Soto Lock Alberto
Published: August 2023

El presente trabajo de investigación trata sobre el diseño e implementación de un sistema prototipo de monitoreo y diagnóstico de fallas en motores insdustriales utilizando las técnicas de las ondículas y la metología de mantenimiento productivo total MPT, todas ellas implementadas sobre la plataforma empresarial J2EE desplegado sobre el contenedor Apache-Tomcat. Para el prototipo se utilizó un procesador de señales DSPIC30F6010A, en donde se implementa el algoritmo de control vectorial y el módulo de comunicación remota que utiliza el puerto RS232 para comunicarse con el nodo de control vía Servlets. Los resultados experimentales demuestran que el prototipo posee ventajas de flexibilidad e interoperabilidad comparado con otras soluciones existentes.
Determinación de las curvas de secado mediante un secador de bandeja, en el proceso de bentonita activada con H2SO4) a nivel piloto
Authors: Romero y Otiniano Pedro , Vicuña Galindo Eder
Published: August 2023

En el proceso de secado de la arcilla activada, existen dos métodos importantes que se pueden usar para secar arcillas activadas: Secador Rotatorio Continuo [l] y Secador por Atomización (6). Pero para determinar las características y mecanismos que intervienen en el secado de la arcilla es fundamental utilizar un secador de bandeja por lote. El objetivo del presente trabajo es obtener la curva de velocidad de secado, fijando ciertas condiciones iniciales de humedad, y definir los mecanismos que intervienen en el secado de las arcillas activadas con ácido sulfúrico, permitiendo utilizar esta información en los procesos de secado continuo, así como encontrar las ecuaciones que gobiernan los diferentes mecanismos de secado. Se utilizó una bandeja de área superficial de 214 cm2 en la cual se carga la bentonita húmeda, las muestras tomadas fueron de 48 a 138 g aprox. y 38 a 50% de humedad inicial para llevarla a una humedad final de 8 a 13%. Se representó la Masa Total de Arcilla (MT) vs. Tiempo de Secado (O), mostrándose dos periodos, uno de tendencia lineal, presentándose luego una desviación, este segundo periodo consta de dos etapas, la primera etapa consiste en la formación de una estructura rígida o semirrígida en la superficie del sólido, la segunda es la remoción de la humedad remanente y esto esta frecuentemente acompañado por una vaporización interna, la cual puede causar la expansión del sólido. Estas características de secado están representadas en la Fig. 6, como una curva de velocidad de secado vs. humedad del sólido. Este segundo período puede ser representado por la ecuación: Wc= 0.003463Xm^1.6556 .
Filtro activo de potencia bajo diferentes tipos de carga
Authors: Núñez Zuñiga Teresa , Soto Lock Alberto , Moreno Martinez Rodolfo
Published: August 2023

Debido al significativo desarrollo alcanzado por la electrónica de potencia se ha producido la proliferación de cargas no lineales como los rectificadores de gran potencia, los que son responsables por el deterioro de la calidad de la onda corriente. Este problema se traduce en la inyección de armónicos de corriente por parte de las cargas no lineales a la red y que se ha convertido en un problema muy serio. En el presente artículo se estudia y simula un Filtro Activo de Potencia (FAP) shunt, para la compensación de diferentes cargas monofásicas no lineales, las que suelen encontrarse en la industria y eliminar el efecto nocivo de la inyección de armónicos de corriente a la red.
Controlador basado en redes neuronales hopfield para un conmutador ATM crossbar
Authors: Lent Ricardo , Yamakawa Peter
Published: August 2023

Este articulo describe un modelo perfeccionado de la red neuronal Hopfield propuesta por Marrakchi y Troudet (1989), adaptada para emplearla como controlador en un conmutador ATM crossbar con buffers FIFO en los puertos de entrada. Utilizando modelos estadísticamente auto-similares para estimar el tráfico entrante al sistema demostramos que el controlador propuesto incrementa notablemente el rendimiento general del conmutador.
Sistema para mejorar la estabilidad de los motores Diesel en regímenes de bajas cargas y velocidades
Authors: Lira Cacho Guillermo , Figueroa Reynoso Raúl , Rondinel Pineda Circe
Published: August 2023

Se propone un sistema para mejorar la estabilidad de funcionamiento de los motores diésel en regímenes de bajas cargas y velocidades de rotación, mediante el empleo de una válvula especial y sencilla, denominada RND, la cual se instala en la tubería de alta presión, Esta válvula se acciona automáticamente, por diferencia de presiones, lo que permite introducir pequeñas cantidades de combustible directamente a la línea, estabilizándose el proceso de inyección en los regímenes indicados. Se incluyen los resultados comparativos de los ensayos realizados en el Instituto de Motores de Combustión Interna de la UNI en una bomba de inyección lineal, a la cual se le instaló la válvula RND y un sensor piezoeléctrico, obteniéndose los oscilogramas de presión, y la desigualdad de suministro de combustible (por ciclo), para así determinar la mejora de la estabilidad del funcionamiento del sistema de inyección.
Sistema de adquisición de datos y transmisión inalámbrica basado en PC.
Authors: Cómina Germán , Carhuancho Ciro , Gutarra Abel
Published: August 2023

En este artículo se describe la construcción de un sistema inalámbrico. El sistema permite el monitoreo de procesos que se desarrollan en ambientes corrosivos u otros fenómenos físicos que se realizan lejos del laboratorio. El sistema se compone de tres partes principales: el conversor analógico a digital con su transmisor, el receptor y la computadora con software de aplicación.
Fotorespuesta de las películas delgadas de Óxido de Ti preparadas por "sputtering"
Authors: Gómez León Mónica , Rodríguez Juan , Lindquist Sten-Eric , Granqvist Claes
Published: August 2023

Películas de óxido de Ti policristalino fueron depositadas empleando DC “sputtering” reactivo con magnetron de platos de Ti en una atmósfera de O2+Ar sobre láminas de vidrio pre-cubiertas con ITO (óxido de indio dopado con estaño). Las fases anatasa y rutilo se obtuvieron por calentamiento del sustrato durante el deposito de las películas. La eficiencia en la conservación foton-incidente-corriente (denominado “IPCE” de la expresión inglesa Incident Photon-to-Current Eficiency) se estudió en función de diferentes parámetros de preparación, tales como la temperatura del sustrato, el espesor de la película y la relación de flujos O2/Ar. La fotorespuesta se midió usando un sistema de tres electrodos empleando un electrolito acuoso de 0.1 M de KI, que fue purgado con nitrógeno. El espectro de la fotorespuesta se obtuvo en un rango de longitud de onda entre 280 y 400 nm. Se encontró que la fotorespuesta dependió grandemente de la estequiometría del material, del espesor de las películas, así como de la estructura cristalina del óxido de Ti.
Programa para elaboración de proyectos de bombeo fotovoltaico. Caso isla Taquile-Puno
Authors: Espinoza Paredes Rafael , Salazar Taute Ivo René
Published: August 2023

El presente trabajo refiere a un programa elaborado como herramienta de ayuda para quienes necesitan realizar un cálculo de costos y determinar el tamaño de los distintos equipos y cantidades de materiales pertinentes a un proyecto de bombeo de agua con energía fotovoltaica. El programa es de fácil manejo, presentando un menú con ingreso de datos, presentación de resultados, impresión de resultados, salir (Fig.2). Se presenta, a su vez la aplicación al caso de la isla de Taquile-Puno (bombeo de 24 m3/día y 200 m de altura total) para determinar el tamaño y costo de un proyecto de bombeo fotovoltaico demostrando la utilidad del programa.
MOVIMENTO “A BREQUE DOS APPS”
Authors: Costa Ilton Garcia da , Paula Bruna Balthazar de
Published: August 2023

O trabalho visa analisar o direito à greve enquanto direito fundamental do trabalhador, especificamente, dos trabalhadores por plataformas digitais. Para tanto, busca compreender o fenômeno social atual do trabalho por plataformas digitais e a ausência de regulamentação interna, a divergência de entendimentos sobre a sua natureza jurídica e a eclosão recente de movimentos sociais por melhores condições de trabalho. Após, analisa o direito de greve, seu contexto e natureza jurídica, bem como seu processo histórico e político de formulação e consolidação na legislação constitucional e infraconstitucional brasileira, até a sua consagração como direito fundamental no artigo 9º da Constituição Federal. Ainda, visa compreender o seu exercício e a regulação pela Lei n° 7.783/1989, que determinou requisitos, procedimentos e legitimidade de deflagração da greve. O método utilizado foi o dedutivo com pesquisa bibliografia em doutrina, legislação, artigos científicos e jurisprudência relativa ao tema. Busca-se mostrar que, independentemente, da divergência existente e da regulamentação restritiva da legislação infraconstitucional, o direito à greve é direito fundamental que possui proteção constitucional, motivo pelo qual a interpretação deve ser ampliativa para que seja garantido a qualquer categoria de trabalhadores.
CONTROLE DISCIPLINAR E BIOPOLÍTICO SOBRE A SEXUALIDADE ATRAVÉS DA TERAPIA DE REVERSÃO DE ORIENTAÇÃO SEXUAL
Authors: Wermuth Maiquel Ângelo Dezordi , Bemfica Melina Macedo
Published: August 2023

O presente trabalho visa analisar em que medida a sexualidade é disciplinada e normalizada por um discurso supostamente científico, que institui a heterossexualidade como normal e a homossexualidade como patológica, e usa dessa dicotomia para tratar as pessoas homossexuais através de terapias de reversão de orientação sexual. A sexualidade, na medida que representa a intersecção entre indivíduo e população, é controlada através das tecnologias do biopoder. A partir da entrada da sexualidade no discurso científico, ela passa a ser dividida a partir da dicotomia saúde - doença. Apesar da homossexualidade, não ser, do ponto de vista científico, uma enfermidade, esse discurso ainda é usado para exercer controle sobre a sexualidade. Isso pode ser facilmente demostrado através da análise da Reclamação Constitucional 31.818, processo judicial que representou o desfecho de um pedido judicial de psicólogos que buscavam autorização para reverter orientação sexual considerada indesejada.
Misión Kemmerer: su impacto sobre el desempeño económico a corto y mediano plazo en los países de Latinoamérica
Authors: Lasso-Jaramillo Daniel , Pinilla-Alarcón Diana , Caicedo-Silva Sara
Published: August 2023

Este artículo analiza el efecto sobre el desempeño económico a corto y mediano plazo de las asesorías financieras de Kemmerer en algunos países latinoamericanos durante la primera mitad del siglo xx. Para ello, explora la variación temporal de la Misión Kemmerer en estos países para efectuar una metodología de estudio de eventos con el fin de cuantificar el efecto del tratamiento sobre el pib real per cápita. Se encuentra que, en promedio, no hay evidencia estadística sólida para afirmar que este tratamiento por sí solo haya afectado el pib a corto y mediano plazo. No obstante, al identificar efectos heterogéneos se encuentra que, para Colombia y Perú, la Misión Kemmerer está asociada a un incremento en el agregado de 224 y 460 usd (respectivamente) del 2011 en el pib real per cápita para el periodo de estudio; mientras que, para Chile, se encuentra una reducción de 361,7 usd del 2011 durante el periodo 1931-1940. Esto porque, para los primeros, las recomendaciones les ofrecieron acceso a inversiones y crédito; mientras que, para el segundo, pudieron asfixiar la economía durante la Gran Depresión.
Cerro de Amalucan: Disponibilidad a pagar (DAP) de una tarifa por el método de valoración contingente-doble límite
Authors:   Universidad Autónoma Chapingo, Torres Ramirez Ramiro , Martínez Damián Miguel Ángel ,   Colegio de Postgraduados Montecillos, Valdivia Alcalá Ramón ,   Universidad Autónoma Chapingo
Published: August 2023

Introducción: La presión sobre las áreas verdes dentro las grandes ciudades han tenido en el mundo efectos negativos para la población, el Parque Cerro de Amalucan (PCA) no es la excepción ha tenido riesgo de ser eliminado, desde sus poco más de 200 hectáreas registradas en los años 20’s a las 74 hectáreas actuales, por ello es importante realizar estudios sobre esta reserva ecológica para generar información que ayude a entender la importancia del PCA. Objetivo: El objetivo es estimar la Disponibilidad a Pagar (DAP) media de los visitantes por la implementación de una tarifa para la ejecución de un programa de manejo y conservación del área empleando el Método de Valoración Contingente (MVC) tipo Doble Limite (DL) para determinar el valor económico de PCA y general recomendaciones para la obtención de recursos con base de aspectos socioeconómicos (ingreso, educación, sexo). Metodología: Empleando un muestreo aleatorio simple se determinó una muestra de 118 encuestas, con base en ello se realizó la recolección de información por medio de encuestas hechas en la Ciudad de Puebla y su área metropolitana. Resultados: Se emplearon los modelos lineal y logarítmico. Se estimó las DAP´s y se seleccionó la que resultó ser mejor con un resultado de $10 MXN ($0.51 DLS) y el resultado se ve afectado por las variables socioeconómicas y de percepción ambiental. Conclusiones: Se concluye que existe la disponibilidad de los visitantes a realizar el pago de una tarifa por acceder al PCA.
Police Ordinances, Customary Statutes and Normativity Regimes Regulating Agriculture and Forest in a Rural District of the Electorate of Mainz between the late Middle Ages and the Early Modern Period
Authors: Härter Karl
Published: August 2023

The article provides a case study on the district Starkenburg of the Electorate of Mainz, demonstrating that order and jurisdiction in rural society was based on two different normativity regimes: local customary statutes and early modern police ordinances.  The study uses the database of early modern police ordinances and digital methods as quantitative analysis and the application of the taxonomy/classification schema of police ordinances to compare the normativity of local customary statutes and police ordinances and to evince general trends and changes between the late Middle Ages and the EarlyModern Period.
Comparison of Convolutional Neural Network Architecture on Detection of Helmet Use by Humans
Authors: Hartatik H. , Anam Muhammad Khoirul
Published: August 2023

The helmet is one of the protective equipment for the head when driving. Although it is a protector, some criminals misuse helmets to disguise their identities, such as robbery at ATMs. Some places have put a sticker not to wear a helmet in the ATM room. However, this advice is often violated. The research adopted the Convolutional Neural Network (CNN) algorithm to identify humans who use helmets and do not use helmets based on digital images. Several CNN models, such as MobileNet-V2, ResNet-50, and VGG-16, were compared in performance. The experiment was carried out using a dataset consisting of 3,207 images which were divided into two classes. The first class is used for classifying human images using helmets with 1,603 images. At the same time, the second class is for images of humans who do not use helmets, with a total of 1,604 images. The test results show that the architecture with the highest accuracy value is ResNet-50, 97.81%. At the same time, the mobileNet-V2 architecture obtained a lower accuracy value of 96.36% and the VGG-16 architecture of 52.25%.
“Welcome to Our World”: Experiences of Persons Living with Dementia Prior to and During the COVID-19 Pandemic
Authors: Harris-Gersten Melissa , Johnson Florence , Granner Josephine , Hastings Susan
Published: August 2023

People diagnosed with dementia are experts on living with the disease, yet their perspectives are often overlooked in research and practice. The pandemic has amplified health inequities among older adults, but the impact of the pandemic on the lived experience of people living with dementia remains unclear. This qualitative study used a series of 2 virtual focus groups with people living with dementia (N = 7) to explore challenging situations and emotions experienced by community-dwelling people living with dementia prior to and during the pandemic. Focus group transcripts were analyzed using narrative thematic analysis with themes finalized through consensus among a 3-member coding team. Two themes with corresponding subthemes emerged: humanizing dementia (subthemes: early experiences with cognitive impairment, health care experiences, overstimulation, activism, tools to live well with dementia) and “welcome to our world” (subthemes: loss, stress, health impacts). Participants faced challenges prior to and during the pandemic that impeded their ability to live well with the disease. In the midst of the disruption of the pandemic, society saw a glimpse of what it was like to live with dementia due to restrictions that limited access to supports, resources, routines, and socialization. Despite significant barriers, people living with dementia identified many strategies to humanize their experience including the use of humor, activism, and social support. Insights of people living with dementia in this study can be used to inspire a shift in the narrative of dementia as a disability to one of strength, ability, and living well.