bluuebunny/crossref_metadata_2025 huggingface dataset:
Adsorption of Silicate Anions from Geothermal Brine Using Chitosan-Polyethylene Glycol Composite to Prevent Silica Scaling on the Dieng Geo Dipa Geothermal Energy System
Authors: Hayati Nur , Humaida Hanik , Siswanta Dwi
Published: October 2021

Silica scaling is a common problem in geothermal power generation facilities which inhibits electricity generation. In order to provide a solution to this problem, the removal of silicate ions using CPEG-TOMAC (Chitosan-polyethylene glycol–trioctyl methyl ammonium chloride) membrane adsorbent was investigated for geothermal brine from Geo Dipa Energy, Dieng. The process is dependent on contact time, pH, and the concentration of silicate. An adsorption batch study that used adsorbents for the geothermal brine of the Dieng Geo Dipa reactor 28A showed that CPEG TOMAC at pH 6 resulted in an adsorption capacity of 72.6 mg g–1. Furthermore, the adsorption of silicate ions onto the membrane followed pseudo-second-order kinetics and the Freundlich isotherm model.
Developments on Synthesis and Applications of Sulfobetaine Derivatives: A Brief Review
Authors: Ningrum Eva Oktavia , Pratiwi Eva Lestiana , Shaffitri Isyarah Labbaika , Suprapto Suprapto , Mukti Mentari Rachmatika , Agustiani Ely , Puspita Niniek Fajar , Karisma Achmad Dwitama
Published: October 2021

Zwitterionic polymers are material families characterized by high dipole moment and highly charged groups. Zwitterionic materials simultaneously possess an equimolar number of cationic and anionic moieties, maintaining overall electroneutrality and high hydrophilicity. Zwitterionic is categorized into three groups: phosphobetaine, carboxybetaine, and sulfobetaine that could form dense and stable hydration shells through the strong ion-dipole interaction among water molecules and zwitterions. As a result of their remarkable hydration capability, low interfacial energy, and marvelous antifouling capacities, these materials have been applied as adsorbing agents, biomedical applications, electronics, hydrogels, and antifouling for membrane separation and marine coatings. This review is focused on polysulfobetaine, which contains sulfonate as a negatively charged group, and quaternary ammonium as a positively charged group. Polysulfobetaine is the most promising one to be applied in the industry since it is commercially available and its monomers are easily prepared. The comparisons of several polysulfobetaine derivatives as antimicrobial, antifouling, surfactant and detergents, biomedical and electronic application, surface modification, and smart hydrogel are presented in this review.
The Impact of 242Pu Speciation on the Bioaccumulation of Plutonium by Babylonia spirata from Jakarta Bay
Authors: Budiawan Budiawan , Asrini Mariska Winda , Prihatiningsih Wahyu Retno , Suseno Heny
Published: October 2021

The research of bioaccumulation Plutonium of Babylonia spirata from Jakarta Bay using 242Pu radiotracer has been conducted. The aquaria experiments were applied by two oxidation states of Pu speciation with three replications. The experiment was carried out by 2 steps, such as uptake and depuration. The bioavailability of 242Pu in the (III) and (IV) oxidation states from sea has been studied for Babylonia spirata. Biokinetics parameters, such as concentration factors (CFss), uptake rate constants (ku), elimination rate constants (ke), bioconcentration factors (BCF), and biological half-life (tb1/2), were investigated. The dissection is carried out to separate the parts of the gastropod's body so that the target organs for Plutonium contamination can be identified. Each part of the gastropod's body was prepared radiochemically and analyzed using an alpha spectrometer. The research shows that Pu4+ is potentially accumulated in greater value than Pu3+ by B. spirata, in which Pu is more rapidly distributed and retained longer in proboscis and gastrointestinal tract.
Selective Solid-Phase Extraction of Meropenem from Human Blood Plasma Using a Molecularly Imprinted Polymer
Authors: Sirumapea Lasmaryna , Zulfikar Mohammad Ali , Amran Muhammad Bachri , Alni Anita
Published: October 2021

This study employed a selective and high adsorption performance for meropenem. Molecularly imprinted polymer for meropenem (MeIP) as the selective sorbent was prepared through a bulk polymerization reaction. Methacrylic acid, ethylene glycol dimethacrylate, benzoyl peroxide, and dimethyl sulfoxide were applied as functional monomer, crosslinker agent, initiator, and solvent, respectively. Scanning electron microscopy, thermogravimetric analysis, Brunauer-Emmett-Teller analysis, and Fourier transform infrared spectroscopy were used to characterize the morphology, pore size, and structure of imprinted polymers. The maximum adsorption capacity was achieved at pH = 3, after 4 h contacted, under 150 rpm, and 25 mg of polymer applied. The maximum adsorption capacity of MeIP for meropenem was 51.963 mg/L; the synthesized polymer had superior selectivity to meropenem compared to that of the other antibiotics (imprinting factor, IF = 2.58). Furthermore, the thermodynamic and kinetic analyses indicated that the results were in accord with the Freundlich model and the pseudo-second-order kinetic model, respectively. MeIP was selective in batch adsorption, and molecularly imprinted solid-phase extraction protocols were selective to meropenem. It was then applied to analyze meropenem in human blood plasma and resulted in 78.52 ± 2.71 of recovery.
Exploring the Potency of Nigella sativa Seed in Inhibiting SARS-CoV-2 Main Protease Using Molecular Docking and Molecular Dynamics Simulations
Authors: Hardianto Ari , Yusuf Muhammad , Hidayat Ika Wiani , Ishmayana Safri , Soedjanaatmadja Ukun Mochammad Syukur
Published: October 2021

Coronavirus disease (COVID-19) is a pandemic burdening the global economy. It is caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). Black cumin (Nigella sativa) seed may contain antivirals for the disease since it was reported to inhibit the human immunodeficiency virus (HIV) and hepatitis C virus (HCV). Main protease (Mpro) is a vital protein for viral replication and a promising target for COVID-19 drug development. Hence, in this study, we intended to uncover the potency of N. sativa seed as the natural source of inhibitors for SARS-CoV-2 Mpro. We collected secondary metabolites in N. sativa seed through a literature search and employed Lipinski’s rule of five as the initial filter. Subsequently, virtual screening campaigns using a molecular docking method were performed, with N3 inhibitor and leupeptin as reference ligands. The top hits were analyzed further using a molecular dynamics simulation approach. Molecular dynamics simulations showed that binding affinities of nigellamine A2 and A3 to Mpro are comparable to that of leupeptin, with median values of -43.9 and -36.2 kcal mol–1, respectively. Ultimately, this study provides scientific information regarding N. sativa seeds’ potency against COVID-19 and helps direct further wet experiments.
Social Network Analysis (SNA) on #Kristengray Hashtag: Understanding Gentrification Side Effects Behind the Digital Nomad Phenomenon
Authors: Bahri Mohammad Thoriq , Widhyharto Derajad Sulistyo
Published: October 2021

Indonesia is one of the destinations countries for digital nomads in South East Asia. Digital Nomad can be described by the person who combining work and leisure activities, without geographical border. The digital nomad lifestyle is becoming trends after an American tourist, Kristen Gray becoming viral on the Twitter Platform, she promoting Bali as a heaven for the digital nomad because of the low cost of living and cultural openness by selling eBook and open consultation services for the people who live in the America and European continents, but then she deported by the Indonesian Immigration Authorities, charged with the misuse of visas (she was used tourism visa for business purposes). Then, the research question arises, Are there potential gentrification effects of digital nomad lifestyle to the local people? And what the government should do to tackle this issue? This research is conducted by analyzing tweets using #kristengray and #digitalnomad hashtag, obtained from 12 January to 12 March 2021. The results are more than 49 percent of users, which dominated by the foreigner is defending Kristen Gray, and forcing the Indonesian Government to open Bali as digital nomad living places, but 51 percent of users, who dominated by Indonesian is refusing what the Kristen Gray doing, by arguing if Bali is purely just for tourism places. The results are the gentrification potentially happening between the digital nomad and local people, because of the difference in economic level, culture and value. Then, the government should consider making a policy to minimize the effects of gentrification resulted in digital nomad activities, suggested opening special visas with the restriction and tax policy for the digital nomad.
Kaum Muda dalam The Social Dilemma: Sebuah Refleksi Kritis tentang Narasi Kerja, Waktu Luang dan Subjektivitas di Era Post-Fordist
Authors: Wibawanto Gregorius Ragil
Published: October 2021

This article presents a reflection on the constitutive relation of youth, work, and leisure in post-Fordist society using a documentary film The Social Dilemma as an entry point. The film has been praised as successful in delivering critics toward digital capitalism. Its content builds upon the idea that the political economy of giant platforms have caused serious problems on the vulnerability of young people’s wellbeing and their precarity of work. Different from previous comments, this article argues that The Social Dilemma does not only convey critique of digital capitalism and youth’s wellbeing, but also represents a relational narrative of work-leisure among young people in post-Fordist society, which is exploitative in its character. Building upon previous studies on youth, work, leisure, and subjectivity this article tries to offer a critical reflection—based on the respective film—that digital arena in the post-Fordist context has created a transformation of leisure into labour. This transformation has further produced a binary subjectivity cultivated by the biopolitical power of immaterial labour through massive digital infrastructure that serve as the main characteristic of post-Fordist society.
‘It Was Like a Space of Resistance’
Authors: Waxman Rebecca
Published: October 2021

This article examines the function of music for female political prisoners during the Pinochet Dictatorship in Chile. The discussion draws on a thematic analysis of testimonies about music by female prisoners from the platform Cantos Cautivos (“Captive Songs”). The article discusses musical happenings, genres of music being performed (e.g., Nueva Canción), and the ways in which music-making was organised. In particular, the article highlights the importance of communal singing. This article also addresses cultural and collective memory and the role that they play in these recollections.
GROUPED PERCHING BEHAVIOR IN MALES OF Incilius coniferus (ANURA: BUFONIDAE)
Authors: Chaves Cordero Gerardo Antonio , García-Rodríguez Adrián , Arias Erick
Published: October 2021

The Evergreen Toad, Incilius coniferus, was found perching in groups near the breeding site, suggesting that this rarely observed behavior can serve as an antidepredatory strategy.
DEPREDACIÓN DEL “CAMALEÓN” DE COLA PLANA (Phrynosoma mcallii) POR EL VERDUGO AMERICANO (Lanius ludovicianus)
Authors: Lara Resendiz Rafael Alejandro
Published: October 2021

En esta nota describimos el caso de un sitio ocupado como almacén de alimento, donde el verdugo americano (Lanius ludovicianus) empala o acuña a su presa el “camaleón” de cola plana (Phrynosoma mcallii) en la región del Alto Golfo de California, San Luis Río Colorado, Sonora, México.
DIETARY ANALYSIS OF THREE SPECIES OF THE GENUS Anolis (SAURIA: DACTYLOIDAE) IN “LOS TUXTLAS,” VERACRUZ, MEXICO
Authors: Flores Villela Oscar Alberto
Published: October 2021

Anoles have been studied by researchers to a greater extent than any other group of lizards. Their high diversity has led them to colonize a variety of niches, making them an ideal model group for evaluating ecological hypotheses such as dietary niche overlap. This work analyzes the stomach contents of 73 individuals from three species of the genus Anolis: A. barkeri (34), A. sericeus (17), and A. tropidonotus (22) occurring in the vicinity of Los Tuxtlas, Veracruz. Analyses performed included Shannon’s index in its log form to calculate dietary diversity, the Jaccard index to estimate the dissimilarity of the species’ diets, and Schoener’s index to measure dietary overlap.  The results suggest that A. barkeri (10.08) hast the most generalist diet, followed by A. sericeus (8.75) and A. tropidonotus (5.78). Schoener’s index showed a considerable amount of diet overlap between A. barkeri and A. sericeus (0.76). We conclude that the three focal species show a generalist feeding behavior in times of abundant prey, such as the rainy season in which this study was conducted. This may lead to the elusion of intra-generic competition, explaining why we did not observe dietary niche displacement between these three species of Anolis.
¿QUÉ ES NECESARIO CONSIDERAR PARA UTILIZAR LOS MODELOS DE NICHO ECOLÓGICO O MODELOS DE DISTRIBUCIÓN DE ESPECIES?: CÓMO NO CAER EN LA TENTACIÓN
Authors: Herpetologia Revista Latinoamericana de
Published: October 2021

El uso de las herramientas relacionadas con el campo del modelado de nichos ecológicos (MNE) o modelado de distribución de especies (MDE) ha aumentado de forma importante desde la década de 1990 . Dada a la capacidad que tienen para explorar la asociación de variables ambientales con datos de presencia de especies, es posible generar información novedosa que explique la distribución de las especies en un sentido geográfico y ecológico interactuante . Aunque se ha señalado que el empleo de estas herramientas obedece a un interés científico más que a la moda de usarlo, desde nuestro punto de vista se ha caído en un uso excesivo y poco crítico, que ha dejado de lado las buenas prácticas que deben considerarse. Por esta razón, el presente editorial pretende hacer una reflexión sobre cuáles son algunos de los aspectos que deben ser considerados en campo del MNE/MDE.
Evaluación psicológica de profesores y alumnos mexicanos durante la pandemia de COVID-19 mediante técnicas de Machine learning
Authors: Navarro Acosta Jesús Alejandro , Soto Mendoza Valeria , Saucedo Zendejo Félix Raymundo , Guajardo Espinoza José Maria , Rivera Morales María Teresa
Published: October 2021

En la presente obra se describe la realización de un ejercicio de validación de resultados de una prueba psicológica aplicada a maestros y alumnos en estado de aislamiento por la pandemia por COVID-19 en el estado de Coahuila, México. El objetivo de este trabajo es aplicar técnicas de machine learning para validar un instrumento que mide las emociones y los sentimientos negativos, así como el sesgo cognitivo o desviación de pensamiento sobre la educación y la pandemia en situación de aislamiento. Para el cumplimiento del objetivo se aplicó un instrumento en formato electrónico que se diseminó en el estado de Coahuila, los usuarios responden y se genera la base de datos, la cual, después de su preprocesamiento es analizada mediante la combinación de Random forest (RF) y Support Vector Machines (SVM); obteniendo como resultado la pertinencia o no de algunos de los reactivos en las pruebas, dando con esto una validez interna al instrumento. Los resultados experimentales muestran que la metodología propuesta es capaz de seleccionar las variables predictoras más relevantes. De esta manera, se obtienen resultados satisfactorios en la clasificación y predicción de diagnósticos psicológicos globales y segmentados por características de los respondientes. Por otro lado, aunque las técnicas implementadas son robustas y confiables, éstas presentan limitaciones en cuanto a la observación de los otros tipos de validez: la de constructo, la externa, entre otras; lo cual pudiera limitar su utilización. Si bien, en el campo de la psicometría existen diversas estrategias clásicas, la metodología propuesta basada en la combinación de técnicas de machine learning para el análisis y validación de este tipo de pruebas, favorece el crecimiento de opciones para mejorar los diagnósticos y en consecuencia el tratamiento de padecimientos psicológicos.
Evaluación de la expansión en suelos presaturados
Authors: González Rufino José Luis , Chávez Alegría Omar
Published: October 2021

Los suelos expansivos causan daños considerables a estructuras y pavimentos. Para solucionarlo, se puede sustituir todo el material o estabilizarlo con aditivos como cal, cemento, ceniza volante, entre otros (Rosales, 2014). Aunque son costosos y requiere que el material sea homogeneizado y estabilizado correctamente (González et al. 2017). En esta se hidrataron suelos arcillosos para incitar la expansión antes de construir. Para cuantificar este efecto en la estabilización de suelos expansivos, se realizaron pruebas de expansión unidimensional con edómetro; expansión libre y sobrecarga de 20 kpa, para dos suelos compactados (Proctor estándar, energía de 600 kN•m/m3), muestreados en el municipio de Pedro Escobedo y la zona de Juriquilla del estado de Querétaro. Se determinó la deformación vertical finalizando la expansión primaria, con una variación en el grado de saturación inicial de 60.0% a 91.5%. Análogamente, se realizaron ensayes triaxiales (UU) para analizar el efecto de dicha variación en los parámetros de resistencia al esfuerzo cortante. Se observó que el aumento del grado de saturación inicial, deformación por expansión y el ángulo de fricción interna disminuyen, los valores de cohesión son constantes. Los resultados se evaluaron mediante el coeficiente de determinación, valorando la correlación que existe entre dos variables interpretando la eficiencia de la recta de mínimos cuadrados propuesta (Gorgas et al., 2011). Obteniendo coeficientes de determinación iguales o mayores a 0.90 en la mayoría de los casos.
Analysis of Slip Ring Induction Motor Drive Using Slip Power Recovery Scheme with Inverter and Chopper Control for Id Fan in Power Plant
Authors: Kapse Manish
Published: October 2021

Abstract: Induction motors are used as industrial drive and for various applications in power plant due to their rugged, robust and simple construction as well as low cost. The speed control of SRIM is dexterous by slip power recovery scheme consisting of inverter control, chopper control, and rotor resistance control techniques. This paper presents the boost in the performance characteristics and energy saving of SRIM drive by inverter and buck-boost chopper based slip power recovery scheme (SPRS). The simulation model of a WRIM drive using inverter and based buck-boost chopper control has been executed in the Simulink platform. The simulation results using inverter and chopper control have been studied. The active power and reactive power have been taken as parameter for analyzing the energy saving by the drive. The simulation result has shown that inverter chopper control SPRS large amount of energy saving.
Biodiesel Preparation, Process Optimization and Characterization from Neem seed Oil
Authors: P Anusha
Published: October 2021

Abstract: The consumption of edible oil is very high in the country and still the indigenous production does not meet the demand and considerable amount of edible oil is imported. Also, it is not advisable to divert these sources for biodiesel production. On the other hand, the non-edible oil resources could be a solution for biodiesel production. Non-edible oil from the plant seeds is the most promising alternative fuel for internal combustion engine because it is renewable, environment friendly, non-toxic, biodegradable has no sulphur and aromatics, has favourable combustion value and higher cetane number. Extensive work has been done on the transesterification of non-edible oils; however, no significant work has been done on the optimization of transesterification process, oil characterization and fuel analysis of most of the non-edible seed oils. Low cost and abundantly found non-edible oils such as Neem oil could be a better option for biodiesel processing. In the present work, optimization of transesterification process and analysis of biodiesel from non-edible oil was done; based on optimized protocol for biodiesel production from Neem seed oil converted into fatty acid methyl esters (FAME) through base catalyzed trans esterification using an optimum ratio of 1:6 (Oil : Methanol) at 600C. Biodiesel from these sources was analyzed for qualitative and quantitative characterization by using, GC-MS and FT-IR techniques. Based on qualitative and quantitative analysis of biodiesel, it is concluded that the biodiesel from these species can be feasible, cost effective and environment friendly. Keywords: Neem oil, Biodiesel, Tran’s esterification, GC-MS, and FT-IR.
An Investigation on Wear, Hardness and Impact Behaviour of Hybrid Composites
Authors: H S Gangadhara
Published: October 2021

Abstract: According to the environmental aspects, the combinations of natural and synthetic fibers has been used for making eco-friendly products. The present investigation has been made develop and characterize a new class of composites with a polymer called epoxy-resin as the matrix and Hemp and synthetic fibers (Carbon, E-glass, Kevlar) are the reinforcing material. These materials are fabricated using hand layup technique to frame a fallowing hybrid composite, 1) Hemp/Carbon/Epoxy 2) Hemp/E-glass/Epoxy 3) Hemp/Kevlar/epoxy composites of 3mm thickness to find the various mechanical properties (wear, hardness and impact strength) of produced samples as per ASTM Standards. For defining relative significance of measured norms pairwise comparison was done. Wear, Hardness and Impact properties are carried out. The effect of fiber loading and length on mechanical properties like wear, hardness and impact strength of composites is studied. In these fallowing conditions shows a better property. The result on this study indicated that Hemp/Kevlar/Epoxy composite shows better impact mechanical properties compare to another two hybrid composites. Hemp/E-Glass/Epoxy composite shows better wear and hardness properties compare to another two hybrid composites. Hemp/Carbon/Epoxy composite shows intermediate properties compare to Hemp/E-Glass/Epoxy and Hemp/Kevlar/Epoxy composite. Keywords: Hemp, Carbon, Glass, Kevlar, Epoxy, Wear, Hardness, Impact test
Study of Diatom Flora of Kaalesar Ghat of Rapti River at Gorakhpur for Forensic Consideration
Authors: Mall Ashutosh
Published: October 2021

Abstract: Diatoms are unique algae. They are scientifically known as Bacillariophyceae. Diatoms have been used in forensic science in a variety of ways, the most frequent being the diagnosis of death by drowning. When a person drowns, water will enter the lungs and then enter the bloodstream through ruptures in the peripheral alveoli before being carried to the other organs such as the liver and heart. Naturally, the microscopic contents of the water, which will include diatoms, will pass into the blood as well. The detection of diatoms in the organs can contribute to a diagnosis of death by drowning, a process referred to as the ‘diatom test’. A study was conducted in the department of Forensic Science, SHUATS, Prayagraj which included the extraction and identification of diatoms from the collected water samples from three different sites of Kaalesar Ghat of Rapti River in Gorakhpur. The acid digestion method was used for diatom extraction. And, after analysis total 13 diatom species were found. The identified diatoms were of great ecological assessment that plays an important role in criminal investigations related to premortem or ante-mortem drowning. Keywords: Diatom, Drowning, D-mapping, Rapti-River
Analysis of Wind Load Effect on C-Shape Tall Building with and Without Shear Wall
Authors: Srivastava Mr. Ankur
Published: October 2021

Abstract: Since land is scarce in metropolitan locations, it's common for tall building to be erected in C form. With the use of software ETABS 2019, this study examines the features of wind-induced story displacement and story drift operating on tall Cshaped models, with and without shear wall. Also, empirical formulae are used for manual calculations and to obtain the wind force and designed wind pressure on C-shaped tall building using codal provisions of IS 875 (Part 3) : 2015, also its applicability has been validated by a case study. For tall C-shaped buildings, this study gives a comparative result on the effect of wind load on building, with & without shear wall on behalf of maximum story displacement and story drift. Keywords: Plan irregularity, shear wall, wind load, ETABS 19
Sintomatologia depressiva e suas repercussões na representação social da depressão: um estudo com adolescentes
Authors: Coutinho de Mello Alexandre , Carneiro Maciel Silvana , Vasconcelos Dias Camila Cristina , Cabral da Silva João Victor
Published: October 2021

A depressão tem sido retratada como o mal do século, tornando-se um problema de saúde pública que tem afetado milhões de pessoas no mundo. Este estudo objetivou compreender como os adolescentes representam a depressão. Participaram 168 estudantes do ensino médio, com idades de 14 a 18 anos, de escolas públicas e privadas de João Pessoa-Paraíba, Brasil. Utilizou-se a Técnica de Associação Livre de Palavras (TALP), Questionário sociodemográfico e a Escala de Ansiedade e Depressão Hospitalar (HADS). Observou-se a representação social da depressão ancorada em vivências subjetivas enfatizando os aspectos individuais desse fenômeno como tristeza, solidão, angústia, sofrimento e suicídio. Os adolescentes apresentaram sintomatologia depressiva em 21,4 %, sendo estes percentuais acentuados quando comparados com outros estudos na área. Espera-se que este estudo possa promover ações de prevenção no contexto escolar e reflexões sobre meios de conscientização da depressão como um transtorno de causas múltiplas.
El test de la golosina en contexto: ¿cómo influye el entorno social en la toma de decisiones y el autocontrol?
Authors: Chaverri Pablo , Barrantes Pereira Rolando , Conejo Diego
Published: October 2021

Este artículo propone una discusión sobre los factores psicosociales que influyen en la manera en que los seres humanos toman decisiones relacionadas con el autocontrol, enfatizando en la forma en que lo hacen los niños preescolares en situaciones de postergación de recompensas. Para ello, toma como punto de partida el test de la golosina puesto en contexto social, para analizar la forma en la cual aspectos tales como la racionalidad, las emociones, la condición socioeconómica y particularmente la confianza en los demás influyen en cómo se toman decisiones y cómo se ejerce o no el autocontrol en relación con el postergar recompensas inmediatas para obtener, posteriormente, otras mayores.
Complications and dosing frequency of 5% imiquimod for genital warts in a young man
Authors: Hoak Sebastian A.
Published: October 2021

A clinical decision report using:

Fife KH, Ferenczy A, Douglas JM Jr, et al. Treatment of external genital warts in men using 5% imiquimod cream applied three times a week, once daily, twice daily, or three times a day. Sex Transm Dis. 2001;28(4):226-231. https://doi.org/10.1097/00007435-200104000-00007

for a patient with genital warts and an unstable social support network.
Remdesivir has questionable efficacy in patients with severe COVID-19 receiving high-flow oxygen
Authors: Burdick Gabriel
Published: October 2021

A clinical decision report using:

Beigel JH, Tomashek KM, Dodd LE, et al. Remdesivir for the Treatment of Covid-19 — Final Report. N Engl J Med. 2020;383:1813-1826. https://doi.org/10.1056/NEJMoa2007764

for a patient with severe COVID-19.
Limb salvage therapy in septic diabetic foot ulcer in patients unwilling to undergo amputation
Authors: Hong Luke
Published: October 2021

A clinical decision report appraising

Shojaiefard A, Khorgami Z, Larijani B. Septic diabetic foot is not necessarily an indication for amputation. J Foot Ankle Surg. 2008;47(5):419-423. https://doi.org/10.1053/j.jfas.2008.05.005

for a patient with a septic diabetic foot.
The efficacy of a sumatriptan and naproxen combination pill in a patient with chronic migraines who discontinued triptan therapy in the past due to a self-reported poor response to sumatriptan monotherapy
Authors: Cohen Ethan M.
Published: October 2021

A clinical decision report using:

Mathew NT, Landy S, Stark S, et al. Fixed-dose sumatriptan and naproxen in poor responders to triptans with a short half-life. Headache. 2009;49(7):971-982. https://doi.org/10.1111/j.1526-4610.2009.01458.x

for a patient with chronic migraines who had self-reported poor response to sumatriptan monotherapy.
Weight loss as sole treatment for obstructive sleep apnea in a patient with significant risks posed by daytime sleepiness
Authors: Daws Steven
Published: October 2021

A clinical decision report using:

Kuna ST, Reboussin DM, Borradaile KE, Sanders MH, Millman RP, Zammit G, Newman AB, Wadden TA, Jakicic JM, Wing RR, Pi-Sunyer FX, Foster GD; Sleep AHEAD Research Group of the Look AHEAD Research Group. Long-term effect of weight loss on obstructive sleep apnea severity in obese patients with type 2 diabetes. Sleep. 2013 May 1;36(5):641-649A. https://doi.org/10.5665/sleep.2618

to inform whether weight loss alone can adequately and promptly treat OSA in a patient with high-risk employment and an aversion to more invasive intervention.
Иконические знаки в теории архитектуры постмодернизма
Authors: Худин Алексей
Published: October 2021

В статье рассматривается понятие «иконического» в архитектуре постмодернизма. Проведён анализ философских и культурологических оснований для его возникновения. Рассмотрен процесс его использования различными авторами сизложением их интерпретаций данного понятия. Изучено его коренное значение в теориях Платона. В статье выявляютсяключевые особенности одной из основных идеологем стиля постмодернизм, что важно для формирования целостного икомплексного понимания этого феномена в рамках теории архитектуры и смежных наук.
Особенности современной проектной градостроительной деятельностив России
Authors: Митягин Сергей
Published: October 2021

Отказ от плановой экономики изменил правовую базу и формы взаимодействия субъектов градостроительной деятельности и их полномочия в процессе организации и ведения этой средоформирующей деятельности. Сегодня градостроительная деятельность связана с правовым и нормативным регулированием федеральных, региональных и муниципальных, а также отраслевых и частных меропри­ятий в области планировочной организации территории, землеустройства и капитального строительства объектов различного назначения.

При этом объектный подход в градостроительной де­ятельности ограничивает использование комплексной, природопреобразующей роли градостроительства, которая только начала развиваться в 80-е годы прошлого века с помощью территориальных схем охраны природы и схем охраны окружающей среды в целях обоснования экологи­чески допустимой и экономически эффективной простран­ственной организации природопользования в границах административно-территориальных образований разного таксонометрического уровня.

Картографирование земной поверхности и отображение её состояния и расположения отдельных природных и искуcственных объектов являются основой подготовки проектных решений на всех масштабных уровнях градостроительных документов.

Потребность в имущественной регистрации картографи­руемых объектов земной поверхности как сохраняемых, так и планируемых программами социально-экономического развития территорий в условиях развивающейся цифровизации проектной градостроительной деятельности, определяет необходимость интеграции и единообразного описания функциональных характеристик этих объектов в системе их градостроительной классификации аналогично устоявшейся структуре кадастровых данных, используемых при регистрации имущественных комплексов, составляю­щих материально-пространственную среду формирования и развития административно-территориальных образова­ний.

На этой основе открываются особенности градостроитель­ного проектирования и перспективы внедрения искусственного интеллекта в градостроительную проектную деятельность.
ON THE CHOICE OF PRESTRESSING PARAMETERS
Authors: Perelmuter Anatolii
Published: October 2021

This paper focuses on the regulation of forces in a statically indeterminate system under the action of many loads. This regulation is realized by prestressing. The paper compares two proposed methods for selecting rational values of the prestressing parameters: maximizing the minimum bearing capacity margin for the elements of the system (1) and equalizing the margins for all elements (2). An illustrative example is provided.
LOCALIZATION OF SOLUTION OF THE PROBLEM FOR POISSON’S EQUATION WITH THE USE OF B-SPLINE DISCRETE-CONTINUAL FINITE ELEMENT METHOD
Authors: Mozgaleva Marina , Akimov Pavel
Published: October 2021

Localization of solution of the problem for Poisson’s equation with the use of B-spline discrete-continual finiteelement method (specificversion of wavelet-based discrete-continual finiteelement method) is under consideration in the distinctive paper. The original operational continual and discrete-continual formulations of the problem are given, some actual aspects of construction of normalized basis functions of a B-spline are considered, the corresponding local constructions for an arbitrary discrete-continual finiteelement are described, some information about the numerical implementation and an example of analysis are presented.
EVALUATION OF THE RELIABILITY OF BUILDING STRUCTURES IN SIMULIA ABAQUS: MODELING OF STOCHASTIC MATERIAL PROPERTIES
Authors: Khvostov Alexander , Zhukov Sergei , Tropkin Sergey , Chauskin Andrey
Published: October 2021

This article describes a software module component integrated with the SIMULIA Abaqus engineering analysis software package and designed to simulate random values of material parameters in a finiteelement model based on specifiedstatistical characteristics, with the possibility of taking into account the physical nonlinearity of material behavior under various combinations of loads and influences.The target group of materials under study is materials of load-bearing elements of building structures, such as concrete, stone, steel. This software module can be recommended for use by specialists, engineers and scientists engaged in probabilistic analysis of the reliability of structures of buildings and structures, apparatus, machines, devices, with the combined use of complexes of computer modeling and engineering analysis. Has a certificateof state registration of the computer program "AS for modeling stochastic properties of materials" No. 2019667439 dated 12.24.2019.
SIMULATION OF AERODYNAMIC INSTABILITY OF BUILDING STRUCTURES ON THE EXAMPLE OF A BRIDGE SECTION. PART 2: SOLUTION OF THE PROBLEM IN A COUPLED AEROELASTIC FORMULATION AND COMPARISON WITH ENGINEERING ESTIMATES
Authors: Belostotsky Alexander , Afanasyeva Irina , Negrozova Irina , Goryachevsky Oleg
Published: October 2021

In this paper, we study aerodynamic instability using the example of a two-dimensional problem of flow around a simplified section of a flexible suspension bridge (on the Tacoma River, USA). A direct dynamic coupled calculation was performed to determine the critical speed of manifestation of aerodynamic instability. The results obtained were compared with the results of engineering estimates presented in [40]. This example shows that to solve such problems it is possible to use the lighter des turbulence model instead of the les turbulence model and, therefore, a coarser mesh. In contrast to existing engineering techniques, direct numerical modeling of the interaction between the structure and the air flow allows one to take into account the reverse effect of the structure on the flow, as well as the mutual influence of several types ofaerodynamic instability.
CALCULATION SCHEME OF REINFORCED CONCRETE STRUCTURES OF CIRCULAR CROSS-SECTION UNDER BENDING WITH TORSION
Authors: Kolchunov Vladimir , Bulkin Sergey
Published: October 2021

The developed design diagram of the ultimate resistance of reinforced concrete structures in bending with torsion of circular cross-sections most fully reflects the features of their actual exploitation. For a spatial crack of a diagonal large ellipse, sections are taken in the form of a swirling propeller with concave and convex spatial parabolas from the first and second blocks between vertical transverse circular sections from the beginning to the end of the crack. For practical calculations in compressed and tensioned concrete, a polyline section of three sections is considered: two longitudinal trapezoids and the third middle section of the radius curve of a small ellipse close to forty-five degrees. When calculating unknown forces, solutions of the equations of equilibrium and deformations of the sections are made up to the end of the crack passing through the moment points for the resultant moments and the projections of internal and external forces. Shear torsional stresses along the linear longitudinal sections of the trapezoid were presented, as well as normal and shear stresses located on the end cross-sections at a distance x from the support. The height of the compressed area of concrete decreases with an increase in bending moments in the spatial section between the first and third cross-sections. It is found in their relationships and connections. The dowel action of reinforcement is determined using a special model of the second level with discrete constants. The static loading scheme was considered from the standpoint of an additional proportional relationship between the torques along the length of the bar in the spatial section and the first and third transverse sections. For a dangerous spatial crack, when projected onto the horizontal axis, the length C was found from a diagonal large ellipse of a round bar.
ANALYTICAL AND NUMERICAL METHODS FOR DETERMINING THE CARRYING CAPACITY OF A PILE BARETT ON WEAK SOILS IN DEEP PITS
Authors: Mangushev Rashid , Nikitina Nadezhda , Le Trung Hieu , Tereshchenko Ivan
Published: October 2021

The article provides an analysis of the bearing capacity of barrett piles in difficult geological conditions at a construction site in the city of Hanoi, Vietnam based on the results of analytical calculations according to Russian building codes, mathematical modeling and field full-scale tests. The paper describes a numerical test of a single barrette for Mohr-Coulomb and Hardening Soil models in the Midas GTS NX software package. The bearing capacity of a barrette in soft soils is also proposed to be determined by an analytical solution for calculating the settlement of a single pile, taking into account the unloading of the pit after soil excavation. The results of full-scale tests at the site of future construction, graphs of "load-settlement" of the barrette head from the applied vertical load and the general assessment of the bearing capacity of the barret pile by various methods are shown.
Factores climáticos, fenología reproductiva y biometría de Mauritia flexuosa (aguaje) en plantaciones forestales de la Amazonía peruana
Authors: Freitas Alvarado Luis , Bardales Lozano Ricardo , Pinedo Panduro Mario , Del Castillo Torres Dennis , Vásquez Vásques Arístides
Published: October 2021

El comportamiento fenológico de las plantas se relaciona con los factores climáticos, por lo cual el objetivo de esta investigación fue evaluar el comportamiento de la fenología reproductiva de Mauritia flexuosa y la influencia de los factores climáticos en la producción y los parámetros biométricos del fruto. Durante 10 años se realizaron mediciones biométricas de los frutos, se registraron fechas de la aparición de espádices, antesis, aparición y maduración de frutos; los cuales fueron correlacionados con precipitación y temperatura. La aparición de espádices y frutos presentaron una correlación positiva con la precipitación, temperatura mínima y media; pero fue negativa con la temperatura máxima. La maduración de frutos y antesis masculina presentaron una correlación positiva con la precipitación. La variable peso de racimos se incrementó notablemente en los años 2016 y 2017, a los 14-15 años de edad de la plantación. El porcentaje del mesocarpo alcanzó promedios de 24,6% en el año 2015 y 24,9% el 2016. El estudio de la fenología y de las características biométricas de los frutos contribuye a entender el comportamiento y a sentar las bases para emprender acciones para el manejo y conservación de esta importante especie.
Diversidad y estructura de Sapotaceae en bosques amazónicos de Madre de Dios, Perú
Authors: Martínez-Sovero Gustavo , Iglesias-Osores Sebastian , Muñoz-Chavarry Pacífico , Seminario-Cunya Alejandro , Alva-Mendoza Denisse , Villena-Velásquez Jim
Published: October 2021

La diversidad y estructura de los bosques miden los recursos y su abundancia en una zona geográfica, los bosques de Sapotaceae son importantes, por servir de alimento a la fauna que la habita. El estudio precisa conocer la diversidad y estructura de la familia Sapotaceae en el Sureste de la Amazonía peruana, Madre de Dios, Perú. El estudio se realizó en tres zonas: la boca del Río Los Amigos, el puesto de control Malinowski en la Reserva Nacional Tambopata y el Centro de Investigación Tambopata. Se evaluó la totalidad de especies de Sapotaceae, siguiendo como transecto la trayectoria de las trochas de las tres zonas de estudio. El género Pouteria presentó la mayor riqueza con tres especies (62,80 %) en las tres zonas de estudio. Seguido de Micropholis con dos especies (11,37 %) y los géneros Manilkara y Ecclinusa con una especie cada una (19,91%). Pouteria tiene mayor frecuencia en las zonas de estudio (34,89 %). Mientras que Micropholis guyanensis evidencia un alto potencial maderable (7,36 m3) sobre el resto de las especies.
Las podas de formación y su efecto en el rendimiento del Sacha Inchi (Plukenetia volubilis L.) en Oxapampa, Pasco, Perú
Authors: Alvarez Benaute Luisa Madolyn , Quino Tarazona Sofonías , Vega Jara Liliana
Published: October 2021

El sacha inchi (Plukenetia volubilis L.) es una planta promisoria que requiere fortalecerse con prácticas agrícolas que garanticen una oferta futura de suficiente volumen en kilogramos por hectárea y calidad adecuada de semilla. El objetivo de la investigación fue evaluar el efecto de las podas de formación sobre su rendimiento en el distrito Constitución, Provincia, Oxapampa, departamento de Pasco, Perú. Se aplicó un diseño de bloques completamente al azar (DBCA), con 3 tratamientos y 3 repeticiones. Los tratamientos fueron: (T1) poda con dos ramas, (T2) poda con tres ramas y (T0) control sin poda. Se utilizó el ecotipo pinto recondo. Con un distanciamiento de 3 x 2 m y soporte de tutores. Las podas de formación se realizaron a los 60 días de la instalación en campo. Los resultados muestran que con el Tratamiento T2 se obtuvo 633,89 kg. ha-1 en el primer año y 1901,67 kg. ha-1 al segundo año, superando estadísticamente a los demás tratamientos. Las podas con tres ramasfavorecen el desarrollo de la planta y el incremento del rendimiento en menor tiempo.
Two-stage least squares simultaneous equation analysis of the demand and supply of chicken meat
Authors: Cancino Escalante Giovanni , Cancino Susan , Cancino Ricketts Daniel Francisco
Published: October 2021

Abstract
Chicken meat production is one of the fastest growing industries in Colombia with an average per person consumption of 35.6 kg. Due to the increase in demand and to the growing importance of the chicken meat production to the Colombian economy the objective of the study was to estimate the demand and supply response and the short run elasticities for chicken meat using a two-stage least squares technique for simultaneous equations. Results indicated that chicken meat demand was responsive to changes in own and beef prices as well as income. The direction of the independent variables were as expected, with the exception of pork prices. The response of chicken meat supply to own-price changes was found to be inelastic in the short run. Chicken feed and the exchange rate elasticities did not present a great impact on the percentage changes of the quantity offered of chicken meat. The proposed model can be useful for producers, chicken meat companies managers and policymakers as understanding the factors that affect the chicken market can lead to optimal managerial and financial decisions
Fabrication of low-cost SiC foams from sugar and recycled polymeric templates
Authors: Bayona Becerra Mayra , Córdoba Tuta Elcy , Güiza Argüello Viviana
Published: October 2021

Macroporous ceramic foams are used in different fields due to their unique properties, which include: low density, low thermal conductivity, high permeability, high temperature stability and high resistance to chemical attack. Highly porous silicon carbide (SiC) foams are materials of great interest for absorption, catalytic support, and thermal insulation applications, among others, due to their chemical resistance, large surface area, low flow resistance, low pressure drop, as well as high resistance to temperature and corrosion. In this work, highly porous, SiC foams were fabricated via template replica, using recycled polymeric foams as sacrificial templates. A sucrose-based resin containing silica powder was used as a foam precursor. Polymeric templates were impregnated, followed by thermal treatment at 1500 °C under inert atmosphere. The effect of C/SiO2 mass ratio (1.0-1.75) in the precursor and the use of alumina (0.5 - 2.5 %wt/v) as a sintering additive were evaluated in terms of the morphology of the fabricated foams, as well as SiC yield.
Análisis y estimación gráfica del comportamiento del COVID-19 en Colombia, Santa Marta y Cartagena enfocado a la letalidad.
Authors: Gómez-Rojas Jorge , Redondo Pérez Jeraldyn , Tovar Hernández María
Published: October 2021

En el presente documento se exterioriza el análisis del comportamiento de los casos diarios de contagio y de muertes por COVID - 19. Esto se lleva a cabo para evidenciar el avance de la pandemia desde sus principios y estimar el impacto de esta en un futuro cercano de forma que los entes de salud estén preparados para ejecutar planes de mitigación y contención en la población. Para lograr su realización se utilizó el método de Regresión Polinomial y Distribución Normal. Los resultados obtenidos son la curva que modela el comportamiento de los casos de contagio y de muerte desde un principio y la predicción del proceder de esta hasta finales del 2020. Las gráficas de estimación modelan el comportamiento del COVID-19 en función de su proceder ideal.
Determinación del potencial eólico en el municipio de Guasca, Cundinamarca y su viabilidad en la generación de energía
Authors: Gantiva Rdoríguez Duban Estiven , Aragón Moreno Juan Antonio
Published: October 2021

Debido a la reducida cantidad de estudios de energía eólico al interior de Colombia, el objetivo de este estudio es determinar el potencial eólico del municipio de Guasca así como su viabilidad en la generación de energía, para ello se recolectaron los datos correspondientes a los años de 2017, 2018 y 2019 de las estaciones meteorológicas que pudiesen medir datos de velocidad de viento tanto dentro del municipio como en los alrededores del mismo (Páramo Chingaza, PNN Chingaza y PTAR Tocancipá) para luego analizar los datos con ayuda del software Windographer. La información generada a partir del análisis muestra que los valores más altos en velocidad de viento proceden del sur del municipio los cuales alcanzan los 4 m/s, así mismo se observa que el flujo del viento en el municipio proviene principalmente desde el este y atraviesa el municipio en dirección oeste. Los análisis de densidad de potencia mostraron que la mayor oferta energética se encuentra al sur del municipio, donde los valores de densidad de potencia alcanzan los 40 W/m2, para evaluar esta oferta eólica se realizó una búsqueda de turbinas eólicas que pudiesen aprovechar las condiciones del municipio, mostrando una generación energética que oscila entre 19,669.02 KWh y 42,711.59 KWh lo que puede considerarse útil para la autosuficiencia a nivel residencial.