bluuebunny/crossref_metadata_2025 huggingface dataset:
Mesofauna assemblages on the extraradical mycelium of Pinus greggii roots with three ectomycorrhizal fungi
Authors: Aguilar Irma Díaz , Martínez-Reyes Magdalena , Pérez-Moreno Jesús , Valdez-Carrasco Jorge
Published: December 2021

Background: The extraradical mycelium (ERM) of ectomycorrhizal fungi is a network inhabited by soil mesofauna, mainly collembolans and mites, forming interactions during the fungal life-cycle, from grazing on hyphae to spore dispersal. However, it is still unknown if ERM of ectomycorrhizal fungi could influence the structure of mesofauna assemblages.

Objective: To evaluate the abundance and community composition of the mesofauna inhabiting the ERM of Hebeloma mesophaeum, Laccaria laccata and Wilcoxina sp. in Pinus greggii roots.

Methods: Mesofauna was collected from the root balls of P. greggii with 80 % of colonization using a washing method.

Results and conclusions: An effect was observed due to ERM differences on species richness and species dominance, but not an effect on the abundance and community composition of the mesofauna. However, Wilcoxina sp. presented the lowest species richness and diversity. Fungus-feeding collembolans shaped species-rich assemblages, being isotomid-tullbergid forms the soil-dwelling taxa. Entomobryidae and Hypogastruridae were the most common families on the soil surface, not being found in Wilcoxina sp., and only a few predatory mites of the Mesostigmata and Endeostigmata were found. The ectomycorrhizal mycelium constitutes a trophic niche of the mesofauna and it might be an evolutionary force in structuring species composition and diversity.
Experiences of the Molecular Diagnosis of Fragile X Syndrome in Ecuador
Authors: Pozo-Palacios Juan , Llamos-Paneque Arianne , Rivas Christian , Onofre Emily , López-Cáceres Andrea , Villareal Jenniffer
Published: December 2021

Fragile X syndrome (FXS) is the most common cause of hereditary intellectual disability and the second most common cause of intellectual disability of genetic etiology. This complex neurodevelopmental disorder is caused by an alteration in the CGG trinucleotide expansion in fragile X mental retardation gene 1 (FMR1) leading to gene silencing and the subsequent loss of its product: fragile X mental retardation protein 1 (FMRP). Molecular diagnosis is based on polymerase chain reaction (PCR) screening followed by Southern blotting (SB) or Triplet primer-PCR (TP-PCR) to determine the number of CGG repeats in the FMR1 gene. We performed, for the first time, screening in 247 Ecuadorian male individuals with clinical criteria to discard FXS. Analysis was carried out by the Genetics Service of the Hospital de Especialidades No. 1 de las Fuerzas Armadas (HE-1), Ecuador. The analysis was performed using endpoint PCR for CGG fragment expansion analysis of the FMR1 gene. Twenty-two affected males were identified as potentially carrying the full mutation in FMR1 and thus diagnosed with FXS that is 8.1% of the sample studied. The average age at diagnosis of the positive cases was 13 years of age, with most cases from the geographical area of Pichincha (63.63%). We confirmed the familial nature of the disease in four cases. The range of CGG variation in the population was 12–43 and followed a modal distribution of 27 repeats. Our results were similar to those reported in the literature; however, since it was not possible to differentiate between premutation and mutation cases, we can only establish a molecular screening approach to identify an expanded CGG repeat, which makes it necessary to generate national strategies to optimize molecular tests and establish proper protocols for the diagnosis, management, and follow-up of patients, families, and communities at risk of presenting FXS.
Modern urology is a one-day surgery. Features of patient management
Authors: Huseynov Ruslan , Perepelitsa Vitaly Vladimirovich , Katunin Alexander Sergeevich , Stank Vadim Anatolyevich , Mirzabekov Murad Mirzabekovich
Published: December 2021

In our country, up to 27 % of inpatient surgical beds are occupied by patients who can be assisted in one-day surgery departments and clinics. This innovative method of organizing treatment improves the quality of medical care, creating a situation in which everything is organized around patients and their interests. The patient’s discharge on the day of surgical treatment makes high demands on the level of professionalism of doctors. Therefore, we have analyzed modern scientific and practical achievements in the management of patients on the principle of one-day surgery.
Clinical case of Fournier’s gangrene in a patient with adenocarcinoma
Authors: Rodoman Grigory Vladimirovich , Zyrjanov Sergej Kensarinovich , Pucman Gleb Aleksandrovich , Ivzhits Marina Aleksandrovna , Kornev Leonid Vladimirovich , Aseckaja Irina L’vovna , Vishnjakov Dmitrij Viktorovich , Sirko Nikolay Igorevich
Published: December 2021

The article describes a clinical case of Fournier’s gangrene in a 65-year-old man with rectal mucinous adenocarcinoma. Given the presence of a malignant neoplasm, elderly age and the general severity of the patient’s condition, the widest empirical antibiotic therapy was prescribed, the spectrum of which overlapped the most probable pathogens. The patient was discharged from the hospital on the 32nd day. The article discusses the rational tactics of antimicrobial therapy in such difficult cases for treatment.
Deep Learning Algorithms based Fingerprint Authentication: Systematic Literature Review
Authors:   University of Hafr Al-Batrin, College of Computer Science and Engineering, Hafr Al-Batin, Saudi Arabia, Chiroma Haruna
Published: December 2021

Deep Learning algorithms (DL) have been applied in different domains such as computer vision, image detection, robotics and speech processing, in most cases, DL demonstrated better performance than the conventional machine learning algorithms (shallow algorithms). The artificial intelligence research community has leveraged the robustness of the DL because of their ability to process large data size and handle variations in biometric data such as aging or expression problem. Particularly, DL research in automatic fingerprint recognition system (AFRS) is gaining momentum starting from the last decade in the area of fingerprint pre-processing, fingerprints quality enhancement, fingerprint feature extraction, security of fingerprint and performance improvement of AFRS. However, there are limited studies that address the application of DL to model fingerprint biometric for different tasks in the fingerprint recognition process. To bridge this gap, this paper presents a systematic literature review and an insightful meta-data analysis of a decade applications of DL in AFRS. Discussion on proposed model’s tasks, state of the art study, dataset, and training architecture are presented. The Convolutional Neural Networks models were the most saturated models in developing fingerprint biometrics authentication. The study revealed different roles of the DL in training architecture of the models: feature extractor, classifier and end-to-end learning. The review highlights open research challenges and present new perspective for solving the challenges in the future. The author believed that this paper will guide researchers in propose novel fingerprint authentication scheme.
ДИСКУРСИВНІ ВИМІРИ ЗАПОВІТУ ЙОСИФА СЛІПОГО
Authors: Мостова С. М.
Published: December 2021

У статті визначено мовленнєвий жанр заповіту Йосифа Сліпого як процес і результат текстотвірної діяльності, спрямований на вербалізацію постулатів віри та їхню транспозицію на суспільні питання, актуальні для України. З’ясовано специфіку заповіту, особливості дискурсивної реалізації оптативності, евіденційності, персуазивності. Схарактеризовано акцентування сакральних смислів у перформативних та імперативних висловленнях, які сприяють більшому впливу на реципієнтів. Заповіт містить волю автора, саморефлексію й орієнтири для суспільства, що робить його важливим джерелом для досліджень.
Exploring the Motivation of Livestreamed Users in Learning Computer Programming and Coding
Authors: Huang Hong , Li Yongji
Published: December 2021

This article discusses the emerging presence of online livestreaming programs for computer coding education. The typologies of motivations from a user-gratification perspective were explored from live coding streaming platforms such as “Twitch.tv” and “LiveEdu.tv”. Categories of motivations were identified from the literature. Content analysis was used for analyzing the distribution of motivation categories in “Twitch.tv,” as well as blog posts on “LiveEdu.tv” guided by Gratifications Theory. From the literature, five types of motivations were identified: 1) Cognitive; 2) Affective; 3) Social Integration; 4) Personal Integration; and 5) Tension release. In live coding streaming communities, the content analysis of 256 streams and twenty six discussion posts indicated that the primary motivation is cognitive related information seeking, followed by social integration such as community outreach, and then personal integration such as personal recognition. Through content analysis, the authors found that the audience's psychological state while watching online livestreaming of coding practice is mainly focused on learning and information seeking, emotional connectedness, and social interactions. Based on the findings, an empirical motivation model in live coding streaming was also developed. The findings for researchers and practitioners alike in programming education can apply respective motivation characteristics in programming education.
Correlation of EEG Envelopes is the Best Method for Identifying Mental Diseases, Functional States, Individual and Intergroup Differences
Authors: Kulaichev Alexey Pavlovich
Published: December 2021

The principal errors of spectral and coherent analysis are discussed,and the mathematics of these methods is not related to EEG nature. In this regard, in 2011, the new method was developed for evaluating EEG synchronyby the correlation of envelopes, which has a direct and fundamental physiological meaning. The basics of this method and the methodology of subsequent multilateral statistical analysis are considered. The effective use of the method for identifying individual and intergroup differences in the norm and several types of schizophrenia, depressive diseases, five stages of sleep, and similar functional states are presented.
AMR Sign: A Clinical Sign of Mechanical Integrity of Medial Meniscus
Authors: Rajani Dr. Amyn M. , Shah Dr. Urvil A. , Punamiya Dr. Meenakshi , Rajani Dr. Alisha A. , Rajani Khushi A. , Rajani Kashish A.
Published: December 2021

Introduction:Meniscus injury is now widely being diagnosed and managed. Meniscus acts as a shock absorber and transmits forces from femur to tibia. However, if the meniscus is torn, the hoop strength is lost. In hidden meniscus injuries, budding arthroscopy surgeons tend to miss the tear. AMR sign acts as a light-bearer for identifying the breach in the collagen architecture.
Methods and Materials: 267 patients were included in the study. Informed written consent was taken from all the patients operated and included in the study. Following a fixed protocol of diagnostic arthroscopy, documentation of AMR sign and its relation with intactness of the medial meniscus was done. If medial meniscus tear was found, after repair, its relation with AMR sign was documented.
Evaluation of Index of Cardiac Electrophysiological Balance in Type 1 Diabetes Mellitus
Authors: ZORLU Çağrı , ÖMÜR Sefa Erdi
Published: December 2021

Background: Type 1 diabetes mellitus (T1DM) has been suggested to carry the risk of developing cardiac arrhythmias. The risk of cardiovascular events and sudden death is higher in patients with T1DM. The index of cardiac electrophysiological balance (iCEB), which shows the balance between ventricular depolarization and repolarization, is a new electrocardiographic (ECG) parameter when compared to other ECG parameters. iCEB provides more information on ventricular arrhythmo-genesis than the other traditional ECG parameters such as QT and corrected QT (QTc) intervals. The aim of this study is to evaluate the relationship between T1DM and iCEB.Materials and Methods: This study was conducted retrospectively. The patient group consisted of 50 patients (58% male, mean age 32.9 ± 8.7 years) diagnosed with T1DM, while the control group consisted of 50 healthy individuals (58% male, mean age 33.9 ± 6.8 years). The clinical, demo-graphic and ECG records of the patients were obtained from our hospital's medical documentation system. iCEB and corrected iCEB (iCEBc) values of all participants were calculated by dividing the relevant QT and QTc intervals by the QRS duration.Results: Mean PR, QRS, and QT intervals were similar between groups, while mean heart rate and QTc interval were found to be higher in the T1DM group than in healthy subjects [(83.1 ± 9.8 vs 78.9 ± 13.3 bpm, respectively, p = 0.019) and (425 ± 20.4 vs 397.6 ± 10.6 ms, respectively, p < 0.001)]. The iCEBc of the patient group with T1DM was higher than the control group (5.1 ± 0.5 vs 4.7 ± 0.4 ms, p <0.001, respectively). However, there was no significant difference in iCEB be-tween the patient and control groups (4.3 ± 0.4 and 4.3 ± 0.4 ms, respectively, p = 0.402).Conclusions: In our study, iCEBc was found to be significantly increased in T1DM patients com-pared to healthy subjects. Consequently; it is important to evaluate the risk of ventricular ar-rhythmia with iCEBc in T1DM patients.Key Words: Electrocardiography, Index of cardiac electrophysiological balance, Type 1 diabetes mellitus, Ventricular arrhythmia
Study of the current waveform effect on the formation of cathode deposits during direct electrolysis. Part 2. Electrolysis of sea water
Authors: Пчельников И.В. , Нгуен Т.Т.З. , Фесенко Л.Н.
Published: December 2021

Поваренная соль является сырьем для получения гипохлорита натрия, при этом затраты на ее приобретение и доставку составляют до 25–30% от общей стоимости произведенного дезинфектанта. Альтернативным сырьем для получения гипохлорита натрия могут быть хлориды, содержащиеся в природной минеральной воде, например подземной, морской и океанической. Минеральная вода будет сырьем для получения раствора гипохлорита натрия достаточно высокой концентрации, который можно затем добавлять в обрабатываемую воду. Опыт эксплуатации установок «ХЛОРЭФС» производства ООО НПП «ЭКОФЕС» показал, что основная проблема надежности работы электролизеров связана с образованием отложений солей жесткости: карбоната кальция на поверхности катодного электрода и гидроксида магния на поверхности катодов электролизера. Это приводит к негативному режиму электролиза, росту напряжения, перегреву и короблению электродной системы, разрушению оксидного покрытия анодов и т. д. Приведены результаты исследований прямого электролиза постоянным и реверсным током соленой воды Южно-Вьетнамского моря. В испытаниях оценивали влияние реверсного тока в сравнении с постоянным током на снижение образования нерастворимых веществ на катодах электролизера, а также определяли технологические параметры электролиза. Выход хлора по току для морской воды был выше 100% в реверсном режиме с плотностью тока 100 А/м2.

Sodium chloride is a raw material for the production of sodium hypochlorite; however, the cost of its purchase and delivery is up to 25–30% of the total cost of the disinfectant produced. An alternative raw material for the production of sodium hypochlorite can be chlorides present in natural mineral water, e. g., underground, sea and oceanic water. Mineral water will be the raw material for obtaining sodium hypochlorite solution of a sufficiently high concentration that can then be added to the treated water. The experience of operating CHLOREFS units manufactured by EKOFES SPE LLC showed that the main problem related to the electrolyzer operation reliability is associated with the formation of deposits of hardness salts – calcium carbonate on the surface of the cathodic electrode, and magnesium hydroxide on the surface of the electrolyzer cathodes. This results in a negative electrolysis regime, an increase in voltage, overheating and warping of the electrode system, destruction of the oxide coating of the anodes, etc. The results of studies of direct electrolysis by direct and reverse current of salt water of the South Vietnam Sea are presented. During the tests the effect of reverse current in comparison with direct current on the reduction of the formation of insoluble substances on the cathodes of the electrolyzer was estimated, and besides, the electrolysis process parameters were determined. The current chlorine yield for seawater was above 100% in the reverse mode with a current density of 100 A/m2.
Clustering feature of metal atoms in pentacene molecular solids: a first-principles study
Authors: Watanabe Shunta , Tomita Yoko , Kawabata Kohei , Nakayama Takashi
Published: December 2021

Metal-atom contamination often induces the degradation of organic molecular devices. In this work, we studied the clustering feature of Au and Al impurity metal atoms in pentacene solids by first-principles calculations. We found that Au atoms prefer to produce clusters in a molecule-edge space due to the strong bonding among Au atoms, and such clusters can increase their sizes by producing molecule vacancies. On the other hand, the Al atom prefers to locate separately around the center of pentacene molecules due to the strong bonding between the Al atom and surrounding molecules, which produces the scattering distribution of Al atoms in pentacene solids.
Study on the nonlocal effects in dimers of circular and elliptical cross-sections
Authors: Zhang Xi , Wu Wenyuan , Gong Yanchun , He Suhong , Wu Fangping , Wu Wangjie , Miao Rende
Published: December 2021

The nonlocal effects of dimers consisting of two cylinders are studied, whose cross-section is elliptical. Importantly, the results with dimers whose cross-section is circular are compared. For comparison, the curvature of the ellipse is set the same as the circle, and four different geometries are considered. The electric field enhancement at the gap center and the absorption spectrum of the dimers are calculated. For the second geometry, either the electric field enhancement at the gap center or the absorption spectrum is approximately calculated using the first geometry, the frequencies corresponding to the peaks are totally different. Similarly, for the fourth geometry, either the electric field enhancement at the gap center or the absorption spectrum is approximately calculated using the third geometry, the disciplines of the peak values change as the radius of curvature increases are totally different.
Cellular automaton approach for carrier degeneracy effects on the electron mobility of high electron mobility transistors
Authors: Fukuda Koichi , Hattori Junichi , Asai Hidehiro , Ninomiya Mariko , Yaita Junya , Kotani Junji
Published: December 2021

GaN-based high electron mobility transistors (HEMTs) are expected to have high performance in base station applications. Recently, it was reported that the combination of the Poisson–Schrödinger method and cellular automaton method is effective for predicting the mobility of channel two-dimensional electron gas of GaN HEMTs. In the operation condition of HEMT, the surface electron density of the channel is on the order of 1013 cm−2, and the effect of degeneracy cannot be ignored in calculating the mobility. Since the electron distribution function is always stably obtained by the cellular automaton method, the degeneracy effect can be considered stably. In this paper, through the comparison of different degeneracy evaluation methods, the anisotropy of the electron distribution function under the electric field acceleration is clarified to affect the HEMT mobility prediction significantly.
Damage-free hydrogenation of graphene via ion energy control in plasma
Authors: Cha Jongin , Choi Harim , Hong Jongill
Published: December 2021

We proposed appropriate plasma conditions for hydrogenation of graphene without structural defect formation using ion energy analysis. Graphene sheets were exposed to plasma having H3
+ ions with energies of 3.45, 5.35, and 7.45 eV. Only the specimen treated by the plasma with the lowest energy was converted back to graphene by thermal annealing, and the others showed irreversible characteristics because of the vacancy defects generated by high-energy ions. Finally, we demonstrated the reversible characteristic in graphene field-effect transistor using the plasma with appropriate ion energy and Joule heating, indicating that damage induced by plasma was negligible.
The use of Mobile Phones in Strengthening Health and Demographic Data Collection by Community key Informants : Experiences from the Kintampo Health and Demographic Surveillance System
Authors:   Health and Demographic Surveillance System, Kintampo Health Research, Box 200 Kintampo, Ghana., Apraku Edward Anane , Sulemana Dr. Abubakari ,   Kintampo Health and Demographic Surveillance System Kintampo Health Research, Box 200 Kintampo, Ghana., Dzabeng Francis ,   West African Centre for Cell Biology of Infectious Pathogens, University of Ghana, Ghana., Dadzie Awurabena Quayeba ,   World Vision Ghana, Accra, Ghana, Nettey Ernest O. ,   Regional Institute for Population Studies, University of Ghana. Accra, Ghana, Nuamah Gifty Fosuah ,   Health and Demographic Surveillance System, Kintampo Health Research, Kintampo, Ghana., Mahama Abukari ,   Kintampo Health and Demographic Surveillance System, Kintampo Health Research, Box 200 Kintampo, Ghana., Afari-Asiedu Samuel ,   Environmental Health and Related Studies, Kintampo Health Research, Box 200 Kintampo, Ghana., Mahama Emmanuel ,   The Global Fund NFM II West Africa Program to Combat AIDS and STI, Accra, Ghana., Zandoh Charles ,   Kintampo Health and Demographic Surveillance System, Kintampo Health Research, Box 200 Kintampo, Ghana. Email: charles.zandoh@kintampo-hrc.org, Asante Dr. Kwaku Poku ,   Kintampo Health and Demographic Surveillance System, Kintampo Health Research, Box 200 Kintampo, Ghana., Owusu-Agyei Prof. Seth ,   Institute of Health Research, University of Health and Allied Health Sciences, Ho, Ghana
Published: December 2021

Identification and reporting of vital events such as births and deaths remain a challenge within communities in low- and middle-income countries (LMICs). LMICs are recently experiencing high mobile phone penetration. This study, therefore, explored the feasibility of Community Key Informants (CKIs) using mobile phone technology to improve reporting of vital events at the community level. Sixty CKIs were purposively sampled from the Kintampo Health and Demographic Surveillance System (KHDSS) setting based on mobile phone ownership. CKIs were grouped into an intervention and a control group. The intervention arm was provided with mobile phone air time to report vital events that occurred in their communities. The control group used the routine system of reporting in the KHDSS. The number of vital events reported by CKIs increased at the end line compared to baseline: (pregnancy: 40.25% to 72.80%; birth: 56.52% to 69.80%; deaths: 33.33% to 68.60%). The time interval between event identification and reporting was much shorter for the intervention group at the end line compared to baseline: (Intervention: 95.06 days to 31.35 days, Control: 87.54 days to 80.57 days). This study demonstrated the feasibility of CKIs using a mobile phone in reporting vital events more timely and effectively.
Qualitative Analysis of Magnetic Moment in BaxTiO3 - Ni xFe3- xO4 Nanocomposite Synthesized by Novel low Temperature Technique
Authors:   Department of Physics, Karpagam Academy of Higher Education, Coimbatore (Tamil Nadu), India, Sudhakaran Ashwin , Sudhakaran Allwin ,   Department of Physics, Karpagam Academy of Higher Education, Coimbatore, (Tamil Nadu), India., Senthil E. Siva ,   Department of Physics, Karpagam Academy of Higher Education, Coimbatore, (Tamil Nadu), India.
Published: December 2021

A novel low temperature preparation technique (<500ºC) is employed for synthesizing nanoscale Barium Titanate -Nickel ferrite composites, where the particle size is controllable. Two different ratios of hard and soft site composites (BTO-NFO 80:20, BTO-NFO 70:30) are synthesized and characterized to study their unique structural, morphological and magnetic properties. The structural refinement studies using XRD data showed 43 % of hard phase (anorthic structure) and 57% of soft phase (Cubic Structure) for BTO-NFO 80:20 and similarly 76% of hard phase and 24% of soft phase in the BTO-NFO 70:30 composite respectively. The SEM and EDAX are used to identify smaller particles of 10 nm using histogram and their sample purity. The VSM analysis at room temperature shows superparamagnetic behavior within the soft ferro magnet with maximum retentivity 2.39 emu/g and saturation magnetization, 10.71 emu/g stating that the composites can be used for various biological applications like drug delivery, hyperthermia, MRI, etc. The ratio Mr/Ms is much less than 0.5, which states that multidomain grains or single domains are formed and the particle interaction is by magneto-static interaction confirming its superparamagnetic nature.
Roughness of the Asphalt Mix: Its Causes, Effects and Methods to Treat It
Authors:   Department of Civil Engineering, Mu'ta University, Jordan, Al-Qummaz Surat Mahmoud Awwad
Published: December 2021

This research aims at investigating roughness in asphalt mix, and to address its effects, causes and methods for treating it to provide safe and smooth driving for the drivers and to the roads users in order to reduce accidents, loss of properties and consumption of fuel which reflects on saving financial costs. The research has depended on qualitative research method through reviewing a number of previous studies related to road constructions, since the desired high quality of roads has become priority to the road users and to the environmentalists who seek to reduce air pollution and emission of harmful gases.
DESCRIPTIVE ANALYSIS OF LUNG CANCER LATERALITY AND EGFR MUTATION IN QUITOECUADOR
Authors: María Ruth Llerena Jurado , Adrián Rodrigo Peñafiel Erazo , Johanna Paulina Mayorga Poveda , Soraya Marianela Núñez Peñaloza , Wendy Yadira Ramos Veintimilla , José Daniel Albán Intriago , Janine Alejandra Molina Pinto , María de los Ángeles Chango Tituaña
Published: December 2021

Introduction:In Ecuador,lung cancer ranks eighth in men and ninth in women.
The objective of the present investigation is to determine in a descriptive analysis a relationship between EGFR mutation
and laterality.
Methods: 37 histopathological samples were analyzed during the years 2015-2016 using descriptive analysis of
frequency as well as crossing of variables.
Results: Of the 37 patients, EGFR mutation could be determined in 18 samples (48.6%) while 19 did not present a
mutation (51.4%) with a distribution of pulmonary lobes with a certain predisposition to be found in the upper lobes and
in the right lung.
Conclusion: The distribution of lung cancer in our research is similar to that demonstrated in international studies in
which right lung cancer occurs more frequently than the left one,as well as the upper lobe above the lower one,having to
recommend that we should start prospective studies and evaluate survival according to laterality.
Prephase-Based Equivalent Amplitude Tailoring for Low Sidelobe Levels of 1-Bit Phase-Only Control Metasurface under Plane Wave Incidence
Authors: Yin Jiexi , Wu Qi , Wang Haiming , Chen Zhining
Published: December 2021

A prephase synthesis method is proposed for
sidelobe level (SLL) suppression of a 1-bit phase-only control metasurface
under plane wave incidence. The array factor of the metasurface with N×N unit cells shows that controlling the number of prephases with
varying values over the reflective surface realizes equivalent amplitude
tailoring. Different from optimizing the prephase distribution, selection of
the numbers of 0 and π/2 prephases in
specific N regions is used to suppress the SLLs. Therefore, the parameters in the
optimization can be dramatically reduced from N2 to N. The prephase
distribution is then designed based on the optimized number of prephases and a
symmetric matrix for SLL suppression in the whole space. The SLLs are further
suppressed by optimizing some of the unit cell states based on similar
equivalent amplitude tailoring. Simulation and measurement of a set of 1-bit
reflective metasurfaces with 20×20 unit cells
verify that the phase-only control metasurface realizes SLL suppression to -13
dB for multiple beam directions from -30 to 30 degrees with a 10-degree step
under normal plane wave incidence.
On the Relation between Mains-Side Current THD and DC Link Voltage Loop Gain in Grid-Connected Unity Power Factor Operating Converters
Authors: Kuperman Alon
Published: December 2021

It is well-known
that attainable DC link voltage loop bandwidth in grid-connected converters
operating with unity power factor is limited due to trade-off with AC-side
current total harmonic distortion (THD). The letter reveals that THD
requirement directly imposes the value of voltage loop gain magnitude at
double-grid frequency; therefore the dynamic performance may be improved
without deteriorating the grid-side current quality by modifying the controller
structure such that the loop gain magnitude at double-grid frequency and the
crossover frequency are decoupled. Experimental results validate the revealed
findings.
La interdisciplinariedad en el aula de clase: factores que influyen en su construcción y uso
Authors: Lugo-López Nidia Danigza , Pérez-Almagro Maria del Carmen
Published: December 2021

Esta investigación tiene como objetivo determinar los factores que docentes y directivos de la Institución Educativa Municipal San Juan Bautista de Salle consideran influyen en el uso y la construcción de una Estrategia Pedagógica Interdisciplinaria (EPI) denominada Unidades Integradas de Trabajo, para el ciclo inicial de primaria, luego de un año de implementación. Para conocer estos elementos, se ha utilizado el método mixto secuencial explicativo con dos fases cuantitativa y cualitativa,   donde los hallazgos de la primera nutren y amplían la segunda. Los resultados muestran   que las actitudes y nivel de conocimientos del profesorado se relacionan con posteriores usos y elaboración de EPI, pero no son las variables más representativas, mientras que los tiempos de trabajo, la conformación adecuada de los equipos, habilidades de trabajo en equipo, institucionalización de la propuesta reflejada en capacitación a personas inmersas en proyectos y planes de trabajo claros donde se establezcan derechos y deberes de docentes y directivos y el compromiso de los participantes tienen un impacto positivo y relevante.
Estrategia pedagógica de mejoramiento profesional y humano para la transformación de la cultura
Authors: Panesso Patiño Vanessa
Published: December 2021

Se presenta el diseño de una estrategia pedagógica enfocada al mejoramiento profesional y humano para generar transformación de la cultura organizacional en una entidad para satisfacer las exigencias en la sociedad colombiana contemporánea. Para ello se realizó un estudio descriptivo-observacional de carácter mixto, recolección de datos mediante observación de desempeño y encuestas a directivos y docentes. Como resultado se logró plasmar la estrategia pedagógica de mejoramiento profesional y humano con sus correspondientes componentes y etapas diseñadas según los documentos organizacionales y lineamientos de la sociedad colombiana. La aplicación de la estrategia pedagógica contribuyó a la socialización y apropiación de valores, a reforzar dinámicas de trabajo en equipo y a mejorar los sistemas de comunicación y relaciones interpersonales.
Osteotecnia como estrategia de aprendizaje de anatomía de cráneo para estudiantes de pregrado y postgrado
Authors: Pérez-Trejos Luz Edith , Osorio-Toro Sonia , Salazar-Monzalve Liliana
Published: December 2021

La mayoría de las investigaciones sobre enseñanza-aprendizaje (E-A) de la anatomía humana (AH) buscan responder a cuál es la forma más eficiente de enseñar y aprender Anatomía Humana. Para esto, se han realizado estudios que son, en su mayoría, de corte cuantitativo, en los que se comparan grupos que utilizan diferentes prácticas de laboratorio y métodos de enseñanza. No obstante, los resultados son controversiales y no logran ser concluyentes. El objetivo de esta investigación consistió en diseñar y aplicar un procedimiento operativo estándar (POE) para la obtención de piezas óseas de hemicara humana como estrategia de E-A de la anatomía del cráneo. Lo anterior se llevó a cabo a través de la técnica de osteotécnia; para su desarrollo se siguieron cinco fases de fundamentación teórica, una selección y determinación de características morfométricas del modelo y la búsqueda de materiales reactivos para lograr la degradación del tejido blando. Los resultados obtenidos permitieron concluir que el diseño y la aplicación del procedimiento operativo estándar para la obtención de piezas óseas de hemicara humana como estrategia de Enseñanza-Aprendizaje de la anatomía de cráneo, resulta eficiente para adquirir conocimientos teóricos y prácticos a través de técnicas fácilmente reproducibles como la osteotecnia
Comunidades de aprendizaje para la inclusión plena en los procesos de enseñanza y aprendizaje de los niños con diversidad cognitiva en aulas heterogéneas
Authors: Galvis Velandia Laura Nataly , Jaimes Márquez Maritza Carolina , Prada Núñez Raúl
Published: December 2021

Se acusa la ausencia de un apoyo sistemático al docente de aula para atender y enseñar efectivamente a la heterogeneidad de niños con    Necesidades    Educativas    Exclusivas en un aula integrada junto con los demás niños; lo cual se evidencia por la falta de una inclusión plena en los procesos de enseñanza y aprendizaje en niños con diversidad cognitiva. Así, se asume el objetivo de diseñar el modelo operativo de las comunidades de aprendizaje, también llamadas comunidades escolares inclusivas, como un recurso de apoyo curricular involucrando, principalmente, a los padres y representantes de los niños con diversidad cognitiva, en la consolidación de las competencias comunicativas y sociales a nivel de los primeros grados de educación elemental en una institución educativa. La metodología parte del proyecto factible desde un enfoque epistemológico pragmatista al seleccionar la investigación mixta. Los resultados alcanzados

en gran medida confirman las generalidades que son recurrentes en las investigaciones con este tipo de población, aunque sorprendió la evidente desatención a áreas curriculares, prácticamente, inexistentes para los niños en situación. De igual forma, se destaca la absoluta indiferencia e indolencia de los padres y/o representantes de estos niños respecto a su proceso educativo.

Todo lo cual demandó con entusiasmo absoluto de la población consultada la generación de orientaciones teórico-procedimentales como modelo de una comunidad de aprendizaje para superar las debilidades identificadas y fortalecer la responsabilidad social propia de la educación inclusiva.
Transformando aulas: una estrategia de alfabetización digital a docentes en tiempos del Covid
Authors: Sánchez Vargas Willmar Alejandro , Niño Vega Jorge Armando , Fernández Morales Flavio Humberto
Published: December 2021

El propósito de esta investigación fue el desarrollar una estrategia didáctica para la alfabetización digital a docentes de diversas disciplinas, con el fin de que estos logren emplear adecuadamente las Tecnologías de la Información y la Comunicación (TIC), en los procesos de enseñanza-aprendizaje mediados por la virtualidad. La investigación se ejecutó bajo un enfoque mixto de tipo cuasiexperimental, en donde la población objeto de estudio correspondió a 20 docentes pertenecientes a una institución educativa de carácter privado, ubicada en el municipio de Sogamoso, Colombia. Los resultados indican que, inicialmente, 17 de los docentes no empleaban las diferentes herramientas TIC en su quehacer pedagógico. Finalizado el proceso de alfabetización, los 20 docentes aprendieron a manejar herramientas digitales, para: preparar clases, programar evaluaciones, calificar actividades, socializar conceptos, realizar   debates,   hacer   diseños y simulaciones, detectar plagio, así como para comunicarse de manera sincrónica y asincrónica con los estudiantes, padres de familia y directivos del colegio. Se concluye que la estrategia didáctica empleada para alfabetizar en herramientas digitales a los docentes, cumplió en alto grado con su propósito. En este sentido, se resalta la necesidad de capacitar constantemente a los docentes en cuanto a TIC, para que estos posean los conocimientos, habilidades y destrezas necesarias para innovar en el aula, y a su vez despertar el interés por aprender a quienes están siendo educados.
Becoming mentors: a narrative exercise to unveil struggles guiding an english language teaching practicum
Authors: Méndez-Rivera Pilar , Pérez-Gómez Francisco
Published: December 2021

This paper analyses the memories of two English language teachers recollected about their struggles to break through as practicum mentors in two public universities. This small- scale narrative study emerged from the constant and collaborative reflection upon their long years of experience advising primary and secondary schools’ mentees, and upon the different situations mentors had to experience while performing their job. Findings revealed that despite having worked in two allegedly different settings, both mentors faced similar issues regarding their vision of education, their view on language and their own identity as teachers, which affected their guidance. They also found that the feedback they provided their mentees perpetuated or contradicted dominant visions where inclusion and diversity were neutralized.
Comprensión y producción textual con estudiantes de educación básica secundaria (15-16 años)
Authors: Tovar Osorio Diana María , Gualdrón Pinto Elgar , De la Barrera Correa Arnaldo
Published: December 2021

El objetivo de este estudio fue diseñar una estrategia metodológica para fortalecer la comprensión y producción textual de los estudiantes. Se adoptó la investigación acción con enfoque cualitativo y se empleó la técnica observación participante. En el   diagnóstico se aplicó un pretest con una prueba Saber de selección múltiple y una prueba escrita. Los estudiantes demostraron dificultad para comprender el sentido global de los textos, analizar información de éstos, leer con sentido crítico, usar y controlar la lengua y la gramática, pobreza lexical, desconocimiento de superestructuras textuales, de la función de conectores y signos de puntuación. Posteriormente, se implementaron tres secuencias didácticas con sus tres fases. Estas correspondieron a las fases: antes, durante y después de leer. En estas se incorporaron las estrategias propuestas por Solé (1998) y Cassany (2014) para abordar los procesos de comprensión y producción textual, mediante diversas actividades, en un grupo de noveno grado. Finalmente, se aplicó un postest, con el fin de contrastar los resultados con la prueba de entrada y determinar la efectividad de la propuesta. Se concluyó que se cumplieron los objetivos porque los estudiantes fortalecieron sus competencias   comunicativas,   mediante el uso de estrategias lectoescritoras, y fueron encontradas algunas coincidencias con otros estudios.
Caracterizando relaciones entre la resolución de problemas y la demostración en álgebra abstracta
Authors: Penagos Mauricio , Sánchez Lamoneda Rafael Julio , Mariño Luis Fernando
Published: December 2021

La investigación desarrollada con 12 estudiantes de licenciatura en matemáticas tuvo como fin dar respuesta a la pregunta científica ¿cómo son las relaciones entre la resolución de problemas y la demostración en algebra abstracta, manifestada por profesores de matemáticas en formación? Para la recolección de información se implementaron seis actividades didácticas, dos encuestas semiestructuradas, como complemento para triangular la información se tomó la opinión a docentes de álgebra abstracta y finalmente se aplicó a los estudiantes una encuesta de satisfacción. Para   el   análisis de datos se tuvo en cuenta la teoría de la Dualidad, Necesidad y Razonamiento Repetido de Harel y Sowder, así como la propuesta de Schoenfeld sobre resolución de problemas. Los hallazgos muestran que tanto al resolver problemas como al demostrar teoremas se encuentran patrones iguales en el abordaje, el uso de   representaciones,   los   procesos de solución, justificación y verificación. Los resultados muestran que en el contexto del algebra abstracta no se encuentran diferencias en los procesos de solución de problemas y demostración de teoremas, por el contrario, son procesos que se complementan uno al otro, además hay incidencia de factores psicológicos, didácticos y creencias sobre la matemática que repercuten en el desarrollo de ambos procesos.
Learning and knowledge technologies in the content language integrated learning for the development of intercultural communicative competence
Authors: Perlaza Torres Leidy Dayan , Macias Molina Adela , Romero Martínez Gonzalo
Published: December 2021

This article focuses on the incidence of learning knowledge technologies and the content learning integrated language approach in the development of intercultural communicative competence (ICC). ICC is considered a relevant competence for the 21st century in the process of teaching and learning foreign languages and the integral development of students. This research arose from the need to complement the development of communicative skills in English students from the UCEVA Language Department of the municipality of Tulua. With the aim of developing intercultural competence in 32 students of English level 2 of Teens and Adults programs. In order to promote the recognition, respect, and acceptance of cultural diversity and the enrichment of cultural identity through interaction, and socialization with others in different situations and contexts. To carry out this quantitative study, with a quasi-experimental design, the “ICC skill to 21st-century” test was applied as a pre-test and post-test to identify and evaluate the level of development of intercultural communicative competence in the participants. Also, the didactic unit “Beyond my thoughts” framed in the use of LKT tools and the CLIL approach was implemented and the descriptive frequency and independent samples techniques of the SPSS v.20 were used to analyze the data obtained. As a result, the statistical analysis showed that there were no significant incidents in the development of intercultural communicative competence, therefore the null hypothesis was accepted. While the descriptive results reflected that the implementation of the didactic unit generated an impact on the development of this 21st-century skill given that intercultural communicative competence involves both the dimensions of people and those experiences that they live. Therefore, its evaluation is not limited to tests but to the analysis and reflection that students make of their process sequentially when facing their reality.
Cálculo promedio mensual de la temperatura en la cuenca hidrográfica de la quebrada Tescua
Authors: Cárdenas Gutiérrez Javier Alfonso , Jácome Carrascal José Leonardo , Vergel Ortega Mawency
Published: December 2021

La temperatura es una de las variables principales para el desarrollo de modelos hidrológicos, los cuales se necesitan para realizar todo tipo de infraestructuras. Estos valores se obtienen mediante la información guardada por estaciones meteorológicas a lo largo del tiempo. La quebrada Tescua, ubicada en el Departamento de Norte de Santander – Colombia, no posee estas estaciones a lo largo de su cuenca hidrográfica, por lo tanto, es necesario el uso de modelos matemáticos que permitan establecer relaciones entre la altura, la temperatura y la pendiente de esta cuenca. De esta manera, la investigación a realizar, utilizará información de valor suministrada por el Instituto De Hidrología, Meteorológica y Estudios Ambientales en el periodo comprendido entre el año 1990 hasta el año 2020 en las estaciones más cercanas a esta cuenca.
Expectativas laborales de estudiantes universitarios que cursan programas en el campo social
Authors: Gamboa Suárez Audin Aloiso , Prada Núñez Raúl , Hernández Suárez César Augusto
Published: December 2021

Las expectativas laborales se refieren de manera general, a las proyecciones ocupacionales que a mediano o largo plazo tienen los estudiantes universitarios. De este modo, el presente artículo pretende analizar estas expectativas que tienen los alumnos de un programa de Trabajo Social de una Universidad Pública en Norte de Santander. El enfoque metodológico se inscribe en el paradigma cuantitativo – Descriptivo. Se aplicó una encuesta a 150 estudiantes compuesta de 41 ítems distribuidos en cinco categorías: perfil demográfico, características académicas, situaciones que los informantes valoran en el trabajo, aporte del futuro profesional al ejercicio de su profesión y las características que debería poseer el trabajo ideal. Los resultados demuestran que las expectativas laborales, se pueden relacionar con elementos altruistas, ya que las respuestas de los participantes tienen una tendencia a procurar el bien de las personas de manera desinteresada, incluso a costa del interés propio.
Efectos en la sostenibilidad de las mipymes manufactureras en la ciudad de Villavicencio por la afectación de la pandemia ocasionada por el síndrome respiratorio agudo severo (SARS- COV)
Authors: Castro-Garzón Hernando , Hernández Criado Juan Carlos , Rivas Trujillo Edwin
Published: December 2021

La pandemia   en   Colombia   no   solo   trajo efectos negativos en la salud; las medidas de contingencia tomadas para mitigar la emergencia de salud pública generaron consecuencias en otras dimensiones como la económica, social y política. Sin lugar a dudas se afectaron algunos sectores más que otros, dentro de estos se encuentran el turismo en general, hotelería y el entretenimiento.

Este trabajo se realizó estudio en el sector manufacturero, más exactamente en la actividad de fabricantes de muebles, colchones y somieres, se analizó cómo fue la sostenibilidad económica de estas MiPymes ubicadas en el barrio San Isidro de Villavicencio durante el aislamiento forzoso, cuáles fueron las estrategias implementadas, que propuestas establecieron para la recuperación, así mismo, la recurrencia de los propietarios de los establecimientos hacia las ayudas ofertadas por el gobierno nacional.

Se estableció una estructura de tipo descriptiva, utilizando un método cuantitativo. La muestra se tomó de los establecimientos del barrio San Isidro de la ciudad de Villavicencio, se usó una herramienta de recolección de información tipo encuesta, posteriormente los resultados de la misma se procesaron en Excel y el programa SPSS 25.

En las conclusiones se observó que el grado de afectación a las finanzas de los fabricantes fue alto, ya que el 83% afirmó haber presentados disminución de ingresos y pérdidas, y tan solo un 3% de los establecimientos se ha recuperado entre un 81% a 100% después de un año enfrentando la pandemia.