bluuebunny/crossref_metadata_2025_split huggingface dataset:
PENGEMBANGAN INSTRUMEN MICROTEACHING BERDASARKAN PEMBELAJARAN ABAD KE-21
Authors: Rasmawan Rahmat 
Published: May 2021

<p><strong>Abstrak </strong></p><p>Penelitian bertujuan untuk mengembangkan instrumen<em> Microteaching</em> berkesesuaian dengan keterampilan abad ke-21 yang valid dan reliabel sehingga layak digunakan. Bentuk penelitian yang digunakan adalah <em>Research and Development</em> (R&amp;D) dengan mengikuti alur pengembangan ADDIE (<em>Analyze, Design, Develop, Implement</em><em>, and Evaluate</em>). Subjek penelitian yaitu 30 dosen dan 70 mahasiswa. Validitas instrumen menggunakan <em>Content Validity Index</em> dan <em>Face Validity</em> yang menunjukkan bahwa instrumen dinyatakan valid. Reliabilitas instrumen menggunakan koefisien interkelas korelasi pada merancang dan melaksanakan pembelajaran dan diperoleh nilai koefisien interkelas korelasi dengan kategori sangat reliabel. Berdasarkan hasil penelitian disimpulkan bahwa instrumen yang dikembangkan valid dan layak digunakan untuk mengukur keterampilan peserta <em>Microteaching</em> dalam merancang dan melaksanakan proses pembelajaran abad ke-21.</p><p> </p><p><strong><em>Abstract</em></strong></p><p><em>The aim of this research was to develop Microteaching assessment instrument that are compatible with the 21<sup>st</sup>-century skill that is valid and reliable so that appropriate to use. The design of this research was Research and Development (R&amp;D) which refers to ADDIE </em><strong>(</strong><em>Analyze, Design, Develop, Implement, and Evaluate</em><strong>)</strong><em>. The research subjects were 30 lecturers and 70 students. The validity of the instrument using the Content Validity Index and Face Validity showed that the instrument was valid. Instrument reliability was using the intraclass correlation coefficient in designing and implementing the learning process obtained result as very reliable. It can be concluded that the developed instrument was valid to be used in assessing participant’s Microteaching skills in designing and implementing the 21<sup>st</sup>-century learning process.</em></p>
ANALISIS KEMAMPUAN LITERASI DIGITAL MAHASISWA
Authors: Dinata Karsoni Berta 
Published: May 2021

<p><strong>Abstrak </strong></p><p>Pandemi COVID-19 menyebabkan terjadinya perubahan proses pembelajaran dari tatap muka langsung menjadi pembelajaran daring yang memerlukan kemampuan literasi digital. Penelitian bertujuan untuk mengetahui bagaimana kemampuan literasi digital mahasiswa. Metode penelitian yang digunakan adalah deskriptif kuantitatif. Populasi penelitian adalah seluruh mahasiswa semester 7 Program Studi Pendidikan Matematika Fakultas Keguruan dan Ilmu Pendidikan Universitas Muhammadiyah Kotabumi tahun akademik 2020/2021 yang berjumlah 41 orang. Sampel penelitian sebanyak 30 orang yang diperoleh dengan menggunakan teknik<em> simple random sampling. </em>Data<em> </em>dikumpulkan dengan menggunakan angket kemampuan literasi digital<em>. </em>Teknik analisis data menggunakan statistik deskriptif. Hasil penelitian menunjukkan bahwa responden “Sangat Baik” pada kemampuan <em>f</em><em>unctional skill and beyond </em>dan “Baik” pada ketujuh aspek literasi digital yang lain. Berdasarkan hasil analisis data, maka disimpulkan bahwa kemampuan literasi digital mahasiswa Program Studi Pendidikan Matematika Fakultas Keguruan dan Ilmu Pendidikan Universitas Muhammadiyah Kotabumi berada pada kategori “Baik”.</p><p> </p><p><strong><em>Abstract</em></strong></p><p><em>The COVID-19 pandemic has led to a change in the learning process from face-to-face to online learning that requires digital literacy skills. This research aimed to determine how students' digital literacy skills were. The research method used was descriptive quantitative. The population in this study were all students of the Mathematics Education Study Program, Faculty of Teacher Training and Education, Muhammadiyah Kotabumi University in the 7th semester of the 2020/2021 academic year, totaling 41 people. The research sample was 30 people who were obtained using simple random sampling technique. Data were collected using a digital literacy ability questionnaire. The data analysis technique used descriptive statistics. The results showed that the respondents were "Very Good" in their functional skills and beyond and "Good" in the other seven aspects of digital literacy. Based on the results of data analysis, it is concluded that the digital literacy skills of students in the Mathematics Education Study Program of the Teacher Training and Education Faculty, Muhammadiyah University of Kotabumi are in the "Good" category.</em></p>
Study of corrosion resistance of pump-compressor pipes made of ferrite-pearlite steel under the action of carbon dioxide mediums
Authors: Tikhontseva N. T. , Savchenko I. P. , Bityukov S.. M. , Varnak O. V. , Sofrygina O. A. 
Published: May 2021

To ensure required complex of steel strength properties, pipes heat treatment is widely used as a quenching for martensite followed by tempering. It is accepted, that metal microstructure formed at that, has a little effect on a steel corrosion resistance in carbon dioxide mediums. Studies were accomplished of steel microstructure effect of the carbon dioxide corrosion speed. In particular, a low-alloyed structural steel, used for production of oil field pipes was selected. As the object of the study, seamless pumpcompressor pipes (PCP), made of medium-carbon steels of several grades with chrome content about 1% (mass.), subjected to two methods of heat treatment: quenching with tempering or normalization with tempering. Corrosion resistance of the steels were accomplished under laboratory conditions of JSC “RusNITI” by application of autoclave facility imitating operation conditions parameters of a working medium at oil extraction. The speed of general metal corrosion was measured as samples mass loss during tests (from 360 to 70 hours) by gravimetric method. By the results of laboratory tests the steel 35ХГФА was recommended to the industrial production of PCP of K72 and N80 strength groups due to GOST 31446 with normalization and tempering. It was established that pipes of steel 35ХГФА with ferrite-pearlite microstructure have higher corrosion resistance in mineralized water mediums at carbon dioxide partial pressure up to 0.20 atm, comparing with regular pipes, manufactured with quenching and tempering. A complex of field tests of PCP was carried out, the pipes made of experimental steel 35ХГФА at an oil deposit. The result of operation of CPC of 88.9×6.45 mm made of steel 35ХГФА having K72 group of strength (after normalization with tempering) during 550 days under conditions of high-mineralized water phase at СО2 partial pressure up to 0.27 atm was found positive. After an intermediate inspection (550 days) the column of PCP was assembled and is in operation at present, the current running time exceeding 1000 days. Based on the results of the complex comparative tests carried out in the corrosion laboratory and under field oil extraction conditions it was established that usage of experimental steel 35ХГФА containing 1% of Cr, after application of normalization technology with tempering resulted in increasing of operating reliability of CPC.
Himen con doble atipicidad. Presentación de un caso
Authors: Morales Valdés Juan Carlos , Bayona Santana Diana Rosa , Villalonga Costa Lilibeth , Perdomo Pulido Yusely 
Published: May 2021

Introducción: En las mujeres virgenes, que no han tenido ninguna copula carnal, existe en la linea de union vulvovaginal una especie de membrana incompleta que se extiende hacia el centro del orificio estrechando su luz, se conoce con el nombre de himen y estos pueden ser típicos o atípicos. Metodologia: Se realizó una revisión y anàlisis de la bibliografia, sobre los distintos tipos de hímenes, lo que permitió identificar un himen atípico no frecuente y tenerlo como punto de referencia en casos semejantes que se pudieran presentar en el futuro. Conclusiones: El himen con doble atipicidad, septado, con un orificio dilatado, es poco descrito en la bibliografía consultada. Durante el reconocimiento por delito sexual los peritos médicos legistas actuantes, deben tener presente la existencia de hímenes como este. En estos casos de delitos sexuales en los que la víctima tenga un himen con estas características, la tipificación del delito dependerá de la investigación policiológica.
La formación inicial de la competencia profesional específica registrar hechos económicos mediante la Contabilidad General.
Authors: Prado Chaviano Elizabet , Baujín Pérez Pilarín , González González Margarita , Paredes Cabezas Maribel del Rocío 
Published: May 2021

El estudio que se presenta responde a una investigación científica de cuatro años de ejecución y aborda la formación inicial de la competencia profesional específica registrar hechos económicos, la cual tiene un carácter complejo y sistémico, donde se integran conocimientos, habilidades, valores, motivaciones, y desempeños, a partir de los aspectos del registro de hechos económicos en el proceso de enseñanza aprendizaje de las asignaturas Contabilidad General I, II, III y IV, lo que repercuten en la Práctica Laboral Contable y Financiera I y en otros contextos de actuación. Se realizó un diagnóstico para lo cual se utilizan métodos del nivel empírico, tales como: la observación, la encuesta y la revisión de documentos, el cual evidenció la necesidad de elaborar un procedimiento para la formación inicial de la competencia profesional específica registrar hechos económicos, para ello se articularon un conjunto de etapas y pasos y se constataron las transformaciones ocurridas con la elaboración e implementación de ejercicios teóricos, prácticos e integradores, el software Arcont, casos de estudio, procedimientos contables, actividades, así como las clases metodológicas, las visitas al departamento de Contabilidad y el perfeccionamiento de la Práctica Contable y Financiera I.
Biochemical Changes in Neonates with and without Seizure: A Comparative Study
Authors: Shahidullah ASM , Afrose Rafika , Deb Kalpona , Sen Bina , Paul Arup Ratan , Saha Kamona Rani , Begum Nilufar 
Published: May 2021

Background: Seizure is a common neurological disorder in the pediatric age group.
Objective: Neonates with seizure have decreased in serum calcium, magnesium, sodium, potassium, and glucose if compared to neonates without seizure.
Methodology: This comparative cross-sectional study was carried out in the Department of Biochemistry at Mymensingh Medical Collage, Mymensingh, Bangladesh in cooperation with the Department of Pediatric of Mymensingh Medical Collage & Hospital, Mymensingh, Bangladesh from July 2005 to June 2006. Neonates were included in the study. Subjects were divided into two groups designated as group I as control group and group II cases. From each subject at least 2 ml of blood were collected from femoral vein and was collected serum for biochemical analysis.
Result: A total of 60 neonates were included in the study. Subjects were divided into two groups-group-I control- (n=20) and group II cases-(n=40). The concentration of serum calcium, magnesium, sodium, potassium, and glucose yielded 7.33 ±0.79, 5.79 ±1.10; 2.18 ± 0.23,1.61 ± 0.25; 134.82 ±3.03, 133.68±8.57; 4.80 ±0.56,5.89 ±2.02; 66.33 ± 8.23, 62.25± 7.96 in group I and group II respectively.
Conclusion: Significant decreases of serum calcium, magnesium and significant increase of serum potassium in neonates with seizure are found in this study. The change in serum sodium and glucose are not significant.
Journal of Current and Advance Medical Research, January 2021;8(1):25-29
Indications of Preterm Caesarean Section: Experience of 100 Cases at a Tertiary Care Hospital in Bangladesh
Authors: Khanam Rebeka , Akter Fatema Mahbooba , Parvin Rabeya , Shampa Lutfunnahar 
Published: May 2021

Background: Preterm caesarean section is performed for different indication among the pregnant women.
Objective: The purpose of the present study was to find out the indications of preterm caesarean section among pregnant women.
Methodology: This cross sectional study was conducted in the Department of Obstetric & Gynaecology at Shaheed Ziaur Rahman Medical College Hospital, Bogra, Bangladesh from January 2007 to December 2007 for a period of one year. Women with the gestational age between 32 to 36 completed weeks who were selected for delivery by Caesarean section were selected as study population. All the women of study were assessed on the basis of detailed history, clinical examination, gestational period, history of premature rupture of membranes, any vaginal bleeding and fetal condition.
Result: A total number of 100 pregnant women were recruited for this study. In this study most of the pregnant women were in the age group of15 to 20 years which was 40(40.0%) cases followed by the age group of 21 to 25 years which were 20(20.0%) cases. About 43(43.0%) cases were complicated with pregnancy induced hypertension. Almost all of them had indication for immediate caesarean section. Among the group incidence of eclampsia was high which was in 23(23.0%) cases; however, preeclampsia was found in 20(20.0%) cases. Ante partum haemorrhage was reported in 10(10.0%) cases. Pregnant women with premature rupture of membrane (PROM) was found in 14(14.0%) cases; furthermore, PROM with Chorioamnionitis was detected in 5(5.0%) cases. Preterm labour with history of previous caesarean section was given by 5(5.0%) women.
Conclusion: In conclusion eclampsia and preeclampsia are the most common indication for preterm caesarean section followed by premature rupture of membrane.
Journal of Current and Advance Medical Research, January 2021;8(1):44-48
Incidence of Infective Endocarditis among Haemodialysis Patients: Experience at a Single Centre in Bangladesh
Authors: Hussain Md. Zakir , Alam Muhammad Rafiqul , Razzak Muhammad Abdur , Khan Mohammad Ehasun Uddin 
Published: May 2021

Background: Infection in hemodialysis is a very dangerous condition for the patients.
Objective: The purpose of the present study was to find out the incidence of infective endocarditis among hemodialysis patients.
Methodology: This was a cross sectional study which was conducted in the Department of Nephrology at Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh during the periods of July 2010 and June 2012. Hemodialysis patients who were attending in the Department of Nephrology at BSMMU, Dhaka were taken as study population.
Results: A total number of 50 patients presented with hemodialysis. Out of 50 patients 34(68.0%) cases were male and 16(32.0%) cases were female. The mean with SD of age of the patients was 38.44±13.0 years with a range of 18 to 68 years. Out of 50 patients 6(12.0%) cases had positive blood culture of which 3 cases had shown Staphylococcus aureus, 1 case had Escherichia coli, 1 case had Enterococci species and 1 case had Salmonella typhi, Among the 50 patients 5 (10.0%) had vegetation on cardiac valve. The patients frequency of dialysis 2 times per week showed 01 (2.43%) positive blood C/S and 5 positive in 3 times per week showed 05 (55.55%) positive blood C/S (p>0.001).
Conclusion: In conclusion infective endocarditis causes infection with high mortality among the patients of CKD undergoing hemodialysis.
Journal of Current and Advance Medical Research, January 2021;8(1):54-58
An Optical Coherence Tomography-Based Deep Learning Algorithm for Visual Acuity Prediction of Highly Myopic Eyes After Cataract Surgery
Authors: Wei Ling , He Wenwen , Wang Jinrui , Zhang Keke , Du Yu , Qi Jiao , Meng Jiaqi , Qiu Xiaodi , Cai Lei , Fan Qi , Zhao Zhennan , Tang Yating , Ni Shuang , Guo Haike , Song Yunxiao , He Xixi , Ding Dayong , Lu Yi , Zhu Xiangjia 
Published: May 2021

BackgroundDue to complicated and variable fundus status of highly myopic eyes, their visual benefit from cataract surgery remains hard to be determined preoperatively. We therefore aimed to develop an optical coherence tomography (OCT)-based deep learning algorithms to predict the postoperative visual acuity of highly myopic eyes after cataract surgery.Materials and MethodsThe internal dataset consisted of 1,415 highly myopic eyes having cataract surgeries in our hospital. Another external dataset consisted of 161 highly myopic eyes from Heping Eye Hospital. Preoperative macular OCT images were set as the only feature. The best corrected visual acuity (BCVA) at 4 weeks after surgery was set as the ground truth. Five different deep learning algorithms, namely ResNet-18, ResNet-34, ResNet-50, ResNet-101, and Inception-v3, were used to develop the model aiming at predicting the postoperative BCVA, and an ensemble learning was further developed. The model was further evaluated in the internal and external test datasets.ResultsThe ensemble learning showed the lowest mean absolute error (MAE) of 0.1566 logMAR and the lowest root mean square error (RMSE) of 0.2433 logMAR in the validation dataset. Promising outcomes in the internal and external test datasets were revealed with MAEs of 0.1524 and 0.1602 logMAR and RMSEs of 0.2612 and 0.2020 logMAR, respectively. Considerable sensitivity and precision were achieved in the BCVA &lt; 0.30 logMAR group, with 90.32 and 75.34% in the internal test dataset and 81.75 and 89.60% in the external test dataset, respectively. The percentages of the prediction errors within ± 0.30 logMAR were 89.01% in the internal and 88.82% in the external test dataset.ConclusionPromising prediction outcomes of postoperative BCVA were achieved by the novel OCT-trained deep learning model, which will be helpful for the surgical planning of highly myopic cataract patients.
Attenuated Induction of the Unfolded Protein Response in Adult Human Primary Astrocytes in Response to Recurrent Low Glucose
Authors: Weightman Potter Paul G. , Washer Sam J. , Jeffries Aaron R. , Holley Janet E. , Gutowski Nick J. , Dempster Emma L. , Beall Craig 
Published: May 2021

Aims/hypothesisRecurrent hypoglycaemia (RH) is a major side-effect of intensive insulin therapy for people with diabetes. Changes in hypoglycaemia sensing by the brain contribute to the development of impaired counterregulatory responses to and awareness of hypoglycaemia. Little is known about the intrinsic changes in human astrocytes in response to acute and recurrent low glucose (RLG) exposure.MethodsHuman primary astrocytes (HPA) were exposed to zero, one, three or four bouts of low glucose (0.1 mmol/l) for three hours per day for four days to mimic RH. On the fourth day, DNA and RNA were collected. Differential gene expression and ontology analyses were performed using DESeq2 and GOseq, respectively. DNA methylation was assessed using the Infinium MethylationEPIC BeadChip platform.Results24 differentially expressed genes (DEGs) were detected (after correction for multiple comparisons). One bout of low glucose exposure had the largest effect on gene expression. Pathway analyses revealed that endoplasmic-reticulum (ER) stress-related genes such as HSPA5, XBP1, and MANF, involved in the unfolded protein response (UPR), were all significantly increased following low glucose (LG) exposure, which was diminished following RLG. There was little correlation between differentially methylated positions and changes in gene expression yet the number of bouts of LG exposure produced distinct methylation signatures.Conclusions/interpretationThese data suggest that exposure of human astrocytes to transient LG triggers activation of genes involved in the UPR linked to endoplasmic reticulum (ER) stress. Following RLG, the activation of UPR related genes was diminished, suggesting attenuated ER stress. This may be a consequence of a successful metabolic adaptation, as previously reported, that better preserves intracellular energy levels and a reduced necessity for the UPR.
Analysis of the Return on Investment in Solar Collectors on the Example of a Household: The Case of Poland
Authors: Niekurzak Mariusz , Kubińska-Jabcoń Ewa 
Published: May 2021

Background: The growing consumption is what drives the development of unsustainable energy and material-intensive production technologies that emit large quantities of pollutants into the atmosphere, water, and land. Obtaining green energy allows reduction of the interference with the environment and, consequently, fits into a sustainable energy development strategy. In order to achieve the emission targets set by the EU for Poland, it is necessary to prioritize the development of renewable energy sources (RES) technologies within the energy sector.Methods: The purpose of the study was to present the results of the research relating to the return on investment of solar collectors for single-family houses in Poland. The research was presented on the basis of the legal conditions applicable to micro installations in the light of the amendment of the RES Act, and the impact of these amendments on the aspects of such investment was determined.Results: On the basis of the constructed economic model used to assess the return on investment of increasing the area of solar collectors, it has been shown that an operating installation will bring measurable economic benefits in the form of reduction in the amount of energy purchased annually in the amount of 6,756 kWh and environmental benefits in the form of reduction of carbon dioxide emissions to the atmosphere 2.4–3.6 Mg per year. An installation subsidized under the “My Electricity” program can reach an NPV of EUR 6,000 over 20 years at a discount rate r = 0 and assuming that the electricity is EUR 0.15/kWh. If the price rises to 0.2 EUR/kWh, the NPV will be 10,000 EUR. For the analyzed installation, the investment consisting in increasing the collector area in accordance with NPV is economically effective for the absorber area in the range of 5.6–7.6 m2 and reaches the maximum value for the absorber area of 6.6 m2, while the absorber area above 7 m2 contributes to reduce the value of the economic return on investment. The obtained results have been generalized, which allows to use them in the process of selecting the size of collector area for similar installations.Conclusion: The return on investment analysis carried out in respect of a detached house allowed to demonstrate that this project is fully justified. Furthermore, pursuant to the Renewable Energy Sources Act in force in Poland, treating a small entrepreneur as a prosumer who may generally take advantage of favorable conditions for discounting the produced energy leads to very favorable possibilities of settling electricity. Considering an entrepreneur as a prosumer who may use one-off depreciation of a solar collectors installation as a fixed asset and request for VAT refund is what makes such an investment very attractive in financial terms and makes it difficult to find a safe investment alternative characterized by such a high rate of return.
Development of a New Silica Aerogel-Polypropylene Foam Composite as a Highly Flexible Thermal Insulation Material
Authors: Yoda Satoshi , Takeshita Satoru , Ono Takumi , Tada Ryosuke , Ota Hideo 
Published: May 2021

A new flexible thermal insulation sheet, a composite of silica aerogel with polypropylene (PP) foam, has been developed. Even though a large volume ratio of silica aerogel (97%) was included, the composite showed high flexibility. Thermal conductivity of the composite was 0.016 W/(m⋅K) at 298 K, which is as low as silica aerogel monolith. Silica aerogel flaking, which has been a problem in practical applications, is very low in this composite due to skin layers of the polymer-foam composite. A supercritical drying process for rolled sheets of the material for large-scale production is also described. Simulations of extraction of 2-propanol from a silica alcogel revealed that rolled composite sheets with small spaces between the sheet composite are able to dry in a reasonable extraction time. These findings led to effective on production of this material on a pilot industrial scale.