bluuebunny/crossref_metadata_2025_split huggingface dataset:
DEL INFINITO POTENCIAL AL ACTUAL: UN RECORRIDO HISTÓRICO A TRAVÉS DE LA METÁFORA CONCEPTUAL
Authors: Díaz Chang Tamara , Hernández Arredondo Elizabeth 
Published: January 2022

En este artículo abordamos el análisis histórico y epistemológico del infinito como concepto matemático, mirado bajo el lente de la metáfora conceptual, tratando de precisar los obstáculos que impidieron, por largos períodos de nuestra historia, la aceptación del infinito actual, permitiéndose solamente la existencia del infinito potencial. Argumentamos que este análisis es un tema de especial relevancia a considerar en las agendas de investigación dentro de la didáctica de las matemáticas. En particular, mostraremos cómo el desarrollo de ciertas metáforas conceptuales condujo a un proceso de axiomatización del infinito actual, que concluyó con los trabajos de Georg Cantor. La metodología implementada se apoya en una investigación bibliográfica de carácter cualitativo y argumentativo fundamentada en una meta-etnografía. A partir de esta investigación, se obtiene información sobre las estructuras matemáticas que transitan entre los diferentes dominios de partida y de llegada de las metáforas conceptuales, a través de las cuales se desarrolló el infinito matemático durante cuatro estadios principales de la historia, mostrando además la transición del infinito potencial al infinito actual. En particular, se identifican al menos cinco metáforas diferentes que el profesor debe considerar y el estudiante debe desarrollar para lograr una comprensión adecuada del infinito matemático.
The ANALISIS BEBAN KERJA OPERATOR PAPER MESIN #6 PT. INDAH KIAT PULP AND PAPER TBK MENGGUNAKAN METODE CARDIOVASCULAR LOAD (CVL) DAN SUBJECTIVE WORKLOAD ASSESSMENT TECHNIQUE ( SWAT )
Authors: Yul Faradila Ananda , Rudi Setiyawan Sat 
Published: January 2022

Indah Kiat Pulp and Paper Tbk merupakan perusahaan industri manufaktur yang bergerak dibidang pengolahan bubur kertas, salah satu mesin kertas terbesar di Perawang adalah Paper mesin #6. Paper mesin #6 beroperasi secara kontinyu 24 jam dan untuk mendukung proses produksi tersebut jam kerja karyawan dibagi menjadi 3 shift kerja. Permasalahan yang terjadi pada paper mesin ini adalah tingginya angka kecelakaan kerja dikarenakan tingginya beban kerja yang dirasakan oleh operator sehingga menyebabkan operator kelelahan baik fisik maupun mental. Penelitian dilakukan pada operator stasiun produksi Wet End, Dry End, Chemical, Winder dan Thimons yaitu dilakukan pengukuran beban kerja fisik dengan menggunakan metode Cardiovascular Load (CVL) dan pengukuran beban kerja mental dengan metode Subjective Workload Assessment Technique (SWAT). Hasil perhitungan metode CVL bahwa beban kerja fisik yang paling besar pada shift 3 grup B terjadi pada operator Thimons 1 memiliki nilai % CVL sebesar 46,62 % dengan rekomendasi diperlukan perbaikan dan operator Wet End 3 dengan nilai % CVL sebesar 44,74 % dengan keterangan diperlukan perbaikan. Berdasarkan hasil CVL, sebanyak 12 karyawan mengalami beban kerja fisik. Berbeda dengan kepala shift dan operator Dekstop Control System (DCS), beban kerja yang dirasakan cenderung lebih ke beban mental. Penelitian pada kepala shift dan operator DCS menggunakan metode, metode SWAT digunakan untuk mengukur beban kerja mental. Penelitian dilakukan dengan cara pengamatan dan wawancara secara langsung, selanjutnya kepala shift dan operator DCS diminta untuk mengurutkan 27 lembar kartu SWAT yang terdiri dari Time Load(T), Mental Effort Load(E) dan Psycological Stress Load (S). hasil pengurutan kartu SWAT diolah dengan menggunakan aplikasi DosBox 0.74, setelah itu dilakukan pengkonversian nilai dari Time, Effort dan Stress (T.E.S). Berdasarkan perhitungan beban kerja mental kepala shift, faktor yang paling berpengaruh adalah faktor Time dengan nilai 60,44% diikuti faktor Effort dan Stress dengan nilai 29,64% dan 9,92%. Hal serupa dengan operator DCS, faktor yang paling berpengaruh adalah faktor Time dengan nilai 68,57% diikuti faktor Effort dan Stress dengan nilai 23,29% dan 8,13%. Beban waktu menjadi faktor utama yang dirasakan oleh karyawan karena tuntutan pekerjaan yang mengharuskan karyawan harus cepat dalam melakukan setiap aktivitas.
La crise de l’eau à la PAZ : de la crise environnementale à la crise technique et politique
Authors: Le Gouill Claude 
Published: January 2022

Depuis l’arrivée d’Evo Morales au pouvoir en 2006, la Bolivie joue un nouveau rôle sur la scène internationale en matière de promotion d’objectifs écologiques ou sur le changement climatique. Sur la thématique hydrique, elle est devenue un symbole de la lutte contre la privatisation depuis les dénommées « guerres de l’eau » de Cochabamba (2000) et d’El Alto (2005), puis en faisant reconnaître l’eau comme un « bien commun mondial ». La « crise de l’eau » qui secoua la ville de La Paz en novembre 2016 avec une coupure du service dans 94 quartiers de la zone Sud remit cependant en cause la politique hydrique gouvernementale. L’enquête réalisée à La Paz sur cette crise a montré que si celle-ci est née de dynamiques naturelles (sécheresse, changement climatique), elle ne reflète pas moins une crise technique mais aussi politique. Elle révèle tout d’abord le manque d’anticipation du gouvernement sur des domaines dont il s’était pourtant porté le garant sur la scène internationale. Elle révèle également des lacunes dans son modèle de gouvernance de l’eau, tant au sein de l’entreprise EPSAS de La Paz qu’au niveau des ministères et des agences gouvernementales. La gestion de l’eau - et de sa crise - est devenue un enjeu politique que cherchent à contrôler le gouvernement et ses opposants (municipalités), mais aussi les organisations sociales souvent en conflit pour le contrôle de la ressource. Alors que le gouvernement d’Evo Morales avait fait de la gestion des ressources naturelles le centre de sa politique gouvernementale, la question hydrique est révélatrice des tensions politiques que traverse la Bolivie, que ce soit entre partis politiques ou entre centralisme et autonomie locale. Enfin, malgré ces tensions, cette crise semble également avoir été un élément déclencheur pour que le gouvernement repense sa politique hydrique en impulsant de nouveaux projets d’infrastructures. Auprès des populations, elle a également engendré une prise de conscience de la rareté de l’eau qui pourrait marquer un tournant pour le pays - toujours plus exposé aux perturbations climatiques - à condition qu’elle soit accompagnée de politiques gouvernementales. Classification JEL : Q25, Q28, Q54, H1, H12, R2
PERSPECTIVAS POBLACIONALES EN LA ACEPTACIÓN DE LOS INMUNOBIOLÓGICOS CONTRA COVID-19
Authors: Alencastro Vaca Cintia Jasmin , Jiménez Peralta Ana Lucia 
Published: January 2022

El objetivo del presente estudio fue analizar las perspectivas poblacionales en la aceptación de los inmunobiológicos contra COVID-19. Para este estudio se aplicó una investigación de tipo cualitativa descriptiva con enfoque etnográfico y fenomenológico. Participaron 30 personas de la parroquia de Izamba. La recolección de datos de realizó mediante una entrevista junto. Entre los resultados se demostró que existe un gran porcentaje de predisposición a recibir la vacuna y un buen conocimiento de las mismas. Se concluye que las perspectivas poblacionales en la aceptación de los inmunobiológicos contra COVID-19 son satisfactorias y demuestran un nivel alto de confianza.bjetivo del presente estudio fue analizar las perspectivas poblacionales en la aceptación de los inmunobiológicos contra COVID-19. Para este estudio se aplicó una investigación de tipo cualitativa descriptiva con enfoque etnográfico y fenomenológico. Participaron 30 personas de la parroquia de Izamba. La recolección de datos de realizó mediante una entrevista junto. Entre los resultados se demostró que existe un gran porcentaje de predisposición a recibir la vacuna y un buen conocimiento de las mismas. Se concluye que las perspectivas poblacionales en la aceptación de los inmunobiológicos contra COVID-19 son satisfactorias y demuestran un nivel alto de confianza.
VALORES: FORTALEZA DE LA UNIVERSIDAD CUBANA
Authors: Castañeda Real Daysi , Cuellar Hernández Dayli , Rosquet Alfaro Yudi 
Published: January 2022

Esta publicación se enmarca en el tema fortalecimiento de valores en nuestras aulas de hoy, demostrar a nuestros estudiantes la importancia de los mismos en todas las etapas de la vida como seres humanos. También se hará énfasis en el valor de los mismos en las relaciones con nuestros estudiantes de Ciencias Médicas .La necesidad de elevar el nivel político- ideológico en la juventud de nuestros tiempos. Se hará énfasis en el rol del profesor al frente de cada aula, o sea el papel del profesor guía en el desarrollo de estos valores tan necesarios en la actualidad. Es por esta razón que se hace necesario el trabajo en cada aula de los valores que muchas veces no están fortalecidos en la juventud de hoy. Los valores constituyen un tema de discusión en nuestras aulas estos están ligados a lo afectivo de las personas, por tanto la carrera de Medicina, nuestros estudiantes de Ciencias Médicas poseen la obligación de desarrollarlos a cada momento. No solo verlos unidos a las aulas sino verlos desde la familia y además la comunidad, ellos tres forman una unión indispensable para el desarrollo y fortalecimiento de los mismos. Desde la familia el individuo forma valores que lo caracterizan como seres humanos durante el transcurso de su vida. La comunidad completa en ella el individuo expone los valores que cada ser humano posee. En la universidad deben aprender y el proceso de enseñanza –aprendizaje determina una socialización en todos y cada uno de los estudiantes de estos valores.
Factors Influencing the Intentions to Adopt Technology of the Broiler Farmer in Livestock Region 3, Thailand
Authors: Wichean Apisara , Sungsanit Mullika 
Published: January 2022

This research aimed to study the types and influence of mindsets, performance expectancy, effort expectancy, social influence and facilitating conditions on farmers' intention to adopt a technology. The research participants were 110 broiler farmers in livestock region 3. The research used a questionnaire to collect quantitative data and analyse the data using frequency, percentage, mean, standard deviation, correlation coefficient and structural equation modeling with maximum likelihood estimation to analyse path coefficienct and structural relationships. The result showed that most of the participants have a growth mindset more than a fixed mindset. Performance expectancy, effort expectancy, social influence and facilitating conditions have directly affected boiler farmers' intention to adopt the technology. Effort expectancy has a total effect on attitude toward using technology. Interestingly, facilitating conditions have shown the most considerable influence on attitude toward adopting the technology. Mindsets have an influence on effort expectancy and facilitating conditions.
HIGHLIGHTS

Most broiler farmers in livestock region 3 possess a growth mindset than a fixed mindset
Performance expectancy, effort expectancy, social influence and facilitating conditions have direct effect on boiler farmers' intention to adopt the technology
Mindsets influence farmers' perception of effort expectancy and facilitating conditions of adopting the technology
Biocatalytic and Biological Activities of Cassia Occidentalis Mediated Silver Nanoparticles
Authors: Singh Shashika , Mohanlall Viresh 
Published: January 2022

Silver nanoparticles (AgNPs) were synthesized using the leaf extracts from Cassia occidentalis. The reactions were marked by a distinct colour change and the formation of AgNPs was monitored by measuring the UV-Vis spectra. The morphology and crystalline phase of the metal nanoparticles were determined using Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray analysis (EDX) and Fourier-Transform-Infrared Spectroscopy (FTIR). The biocatalytic activity of the AgNPs against nitrifying compounds was determined using 4-nitrophenol and 4-nitroalanine. The biological screening involved analyzing the AgNPs effectiveness against gram-negative and gram-positive bacteria (Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, Pseudomonas aeruginosa, Bacillus cereus and Enterococcus faecalis). The AgNPs displayed minimal inhibition at low concentrations ranging from 25 to 50 μg/mL. The toxicity of the AgNPs was tested using the brine shrimp assay and was observed as non-toxic with a nearly zero mortality rate. The AgNPs exhibited an antioxidant potential of 70.90 % inhibition at 1000 µg/mL. C. occidentalis is noted as a potential bioresource for synthesizing AgNPs with applications as antibacterial, antioxidant and biocatalytic agents.
HIGHLIGHTS

The addition of Ag nanoparticles to C. occidentalis plant extracts resulted in the formation of AgNPs-C. occidentalis complexes
The AgNPs-C. occidentalis complexes were characterized using Transmission Electron Microscopy, Scanning Electron Microscopy with EDX, UV-Vis spectrophotometry and IR spectroscopy
These AgNPs-C. occidentalis complexes were very stable and showed antibacterial activity against a range of tested gram-positive and gram-negative bacteria at low doses, thus proving to be good antimicrobial agents
The AgNPs-C. occidentalis complexes showed higher scavenging activity than leaf extracts of C. occidentalis. The AgNPs have increased catalytic ability for the reduction of 4-nitrophenol and 4-nitroalanine after a 30 min time interval

GRAPHICAL ABSTRACT
Design and Simulation of Air-Fuel Percentage Sensors in Drone Engine Controlling
Authors: Abdulsada Mohammed Abdulla , Hussein Mohammed Wajeeh , Jahlool Jabbar Shatti , Naghmash Majid S. 
Published: January 2022

This paper presents the design and simulation of air-fuel percentage sensors in drone engine control using Matlab. The applications of sensor engineering system have been pioneer in technology development and advancement of automated machine as complex systems. The integration of drone fuel sensor system is the major series components such as injector, pumps and switches. The suggested model is tuned to interface drone fuel system with fuel flow in order to optimize efficient monitoring. The sensor system is improved and virtualized in Simulink block set by varying the parameters with high range to observe the fuel utilization curves and extract the validated results. The obtained results show that the possibility of engine operation in critical conditions such as takeoff, landing, sharp maneuver and performance is applicable to turn off the system in case of break down in the sensor to ensure the safety of drone engine.
HIGHLIGHTS

The drone engine fuel rate sensor is designed and examined to determine the air-to-fuel ratio
The suggested model is tuned to interface drone fuel system with fuel flow in order to optimize efficient monitoring
The obtained results show that the possibility of using engine with different failure mode and fault considerations
The represented control structure is simple, efficient and provides the required air-to-fuel ratio
Synthesis, Characterization and Photocatalytic Performance of Poly-3-Thenoic Acid/Cu-TiO2 Nanohybrid for Efficient Visible Light Assisted Degradation of Bismarck Brown R
Authors: Raju Imandi Manga , Rao Tirukkovalluri Siva , Rao Miditana Sankara 
Published: January 2022

The present work reported on the synthesis and characterization of Poly-3-Thenoic acid/Cu-TiO2 nanohybrid (PCuT) for the photocatalytic degradation of organic azo dye pollutant from wastewater. The as-synthesized nanohybrid by an in-situ modified sol-gel method including chemical oxidative polymerization was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, UV-visible diffuse reflectance spectroscopy (UV-vis.DRS), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), transmission electron microscopy (TEM) and Brunauer-Emmet-Teller (BET) surface area analysis. The characterization results revealed the formation of small aggregates of polymer contained high crystalline anatase TiO2 nanoparticles (XRD) with narrowed bandgap energy (UV-vis.DRS), decreased particle size (TEM) with smooth surface morphology (SEM) and large surface area (BET). All the constituent elements of the polymer and Cu-TiO2 were found in the PCuT nanohybrid material (EDX) and their chemical interaction studied by FT-IR confirmed the stability of the nanohybrid. The photocatalytic activity of the nanohybrid was tested by the degradation of Bismarck Brown R dye under visible light irradiation. To enhance the photocatalytic efficiency, effects of various catalyst/dye reaction parameters such as polymer content, solution pH, catalyst dosage, and initial dye concentration were studied and optimized.
HIGHLIGHTS

Poly-3-Thenoic acid/Cu-TiO2 nanohybrid material was successfully synthesized by in situ modified sol-gel process
Poly-3-Thenoic acid has enhanced the visible light absorption capacity of anatase TiO2 in nanohybrids
Electron-hole recombination in TiO2 was effectively inhibited by Cu doping
Bismark Brown R, an organic pollutant was successfully degraded in 75 min of visible light irradiation

GRAPHICAL ABSTRACT
The Distribution of Intestinal Amoebae in Wild Long-Tailed Macaques (Macaca fascicularis) in Sabang City, Aceh Province, Indonesia
Authors: Junaidi Junaidi , Cahyaningsih Umi , Purnawarman Trioso , Latif Hadri , Sudarnika Etih , Farida Farida , Maryatun Maryatun 
Published: January 2022

Amoeba that infects primates can also be found in humans and can be zoonotic. This study aims to identify the distribution of intestinal amoeba in the wild Long-Tailed Macaque (LTM) group located at Cot Murong, Kebun Mangga, and Tugu Zero Kilometer Monument (IZKM) in Sabang City, Aceh Province, Indonesia. A total of 177 stool samples from 59 tails from the three LTM groups were examined microscopically. The results of the examination confirmed seven species of intestinal amoeba, three of which belonged to the genus Entamoeba, namely the Entamoeba histolytica/dispar/moshkovskii complex, Entamoeba coli, Entamoeba pölecki, and four other species from different genera, namely Iodamoeba butschlii, Blastocystis sp., Endolimax nana and Dientamoeba fragilis. The prevalence of intestinal amoeba in wild LTM in Sabang City was 57.6% (102/177). Dientamoeba fragilis was only found in the LTM group of Kebun Mangga. Entamoeba coli dominated the highest prevalence in all LTM groups. The LTM group located around Cot Murong and IZKM had a higher concentration of infection with intestinal amoeba than the Kebun Mangga location. The statistical tests showed a significant difference between the proportions of Iodamoeba butschlii, Endolimax nana and Dientamoeba fragilis, both found in the LTM Cot Murong, Kebun Mangga, or IZKM groups. This study is the first to report amoebic infection prevalence in the wild LTM group in Sabang City, Aceh Province. The pathogenic amoeba that cannot be distinguished microscopically from morphologically identical amoebae needs to be identified molecularly to identify variants and their potential as zoonotic agents.
HIGHLIGHTS

Intestinal amoeba species found in fecal samples of the wild long-tailed macaques group of Sabang City, Aceh Province, Indonesia, can also be found in human stool samples
As many as three of the seven identified amoeba species, namely Entamoeba histolytica, Dientamoeba fragilis, and Blastocystis sp. is a pathogen that can cause diarrhea and colitis in humans and non-human primates
The prevalence of amoeba infection in wild macaques in Sabang City is in the high category and tends to increase the incidence of infection in the macaque group, which has more susceptible individuals, namely infants, children, and females

GRAPHICAL ABSTRACT
Polysaccharide hydrolyzing enzyme activity of bacteria, native to Apis florea gut
Authors: Ganeshprasad D. N. , Karthik Yalpi , Sachin H. R. , Sneharani A. H. 
Published: January 2022

Introduction and Aim: Apis florea commonly known as “dwarf honey bee” harbors enormous gut bacteria that can digest complex carbohydrates and other food components. In this regard, the present investigation was focused on analyzing the polysaccharide degrading ability of bacteria isolated from the gut of honeybee, for their possible application in nutraceutical and pharmaceutical industries.

Materials and Methods: Nine bacterial isolates were screened for carbohydrate degrading enzymes viz., amylase, pectinase, cellulase, tannase and laccase, using respective substrate by plate assay method. Further activities of amylase and pectinase were measured quantitatively by dinitrosalicylic acid (DNS) method.

Results: All the nine selected isolates exhibited amylase and pectinase activities. However, only two isolates exhibited lignolytic and cellulolytic activity. None of the isolates showed tannin degradation. Maximum amylase activity (4.95 U/mg) was observed in Bacillus halotolerans af-M9 followed by Klebsiella oxytoca af-G4 (4.62 U/mg). With respect to pectinase activity Klebsiella pneumoniae af-E17 displayed higher activity (0.24 U/mg) followed by Klebsiella oxytoca af-G4 (0.20 U/mg).

Conclusion: Habitat-specific innovations are being explored for novel compounds for therapeutic applications. This study throws a light on selection of carbohydrate degrading bacteria from a new source i.e., GUT of honeybee.
Phagocytic and oxidative burst activity of neutrophils in type 2 diabetic patients with foot ulcers
Authors: Bernhardt Grisilda Vidya , Shivappa Pooja , Shantaram Manjula , Jayakar Varsha , Lokapur Vinayak , Pinto Janita R. T. 
Published: January 2022

Introduction and Aim: Diabetic foot ulcers are common complications seen in diabetic patients. Treatment of this disabling foot sore remains a challenge to health care professionals. This study aimed at evaluating whether the neutrophils from type 2 diabetic patients with foot ulcers present an impairment of phagocytic index and impairment in respiratory burst. We also aimed at understanding whether the impairment in neutrophil phagocytic activity can be alleviated with short course of standard treatment regime for foot ulcers.

Methodology: For this case-controled study, 43 participants with type 2 diabetes (18 with foot ulcers and 25 without foot ulcers) were prospectively recruited along with 18 healthy volunteers. Phagocytic activity of neutrophils and respiratory burst of neutrophils was assessed along with ESR, percentage neutrophil counts before and after 2 weeks of standard treatment for foot ulcers.

Results: Neutrophils of type 2 diabetic patients (with and without foot ulcers ) showed lower levels of phagocytic index and lower percentage of respiratory burst on comparison with non-diabetic subjects. Furthermore, on receiving treatment for foot ulcers, a significant improvement in neutrophil phagocytic indices were observed, along with improvement in wound ulcer score.

Conclusion: Phagocytic activity of the neutrophils is impaired in type 2 diabetics (with and without foot ulcers). Neutrophil phagocytic indices can be improved on glycemic control. Additionally, improvement in neutrophil phagocytic indices after short course treatment for foot ulcers can be useful markers to predict treatment efficacy and in prognosis of diabetic foot ulcers.