bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Ultrasound on Henna Leaves Drying and Extraction of Lawsone: Experimental and Modeling Study
Authors: Bennaceur Said , Berreghioua Abdelaziz , Bennamoun Lyes , Mulet Antonio , Draoui Belkacem , Abid Mostafa , Carcel Juan A.
Published: March 2021

The effect of drying temperature and the application of ultrasound on drying kinetics of Lawsonia inermis (henna) leaves and the extraction of lawsone from the dried samples was addressed. Indeed, henna leaves were dried with and without the application of ultrasound (21.7 kHz, 30.8 kW/m3) at 40, 50 and 60 °C with a constant air velocity (1 m/s). As expected, both the increase of temperature and the application of ultrasound decreased the drying time and increased the rate of extraction of the lawsone. The values of the effective diffusion coefficients obtained were used to quantify this influence showing the value increases with higher drying temperature and the application of ultrasound. Moreover, the influence of temperature was quantified by the estimation of the activation energy from an Arrhenius-type equation (46.25 kJ/mol in the case of drying without ultrasound application and 44.06 kJ/mol in the case of ultrasonically-assisted drying). Regarding the influence of studied variables on lawsone extraction yield, the higher is the temperature, the lower is the yield, probably linked with lawsone degradation reaction due to thermal treatment. On the contrary, the application of ultrasound improved the extraction yield mainly at the lower drying temperature tested of 40 °C.
Analysis of the Influence of the Insulation Parameters of Medium Voltage Electrical Networks and of the Petersen Coil on the Single-Phase-to-Ground Fault Current
Authors: Toader Dumitru , Greconici Marian , Vesa Daniela , Vintan Maria , Solea Claudiu
Published: March 2021

Settings of protection are essential to ensure the sensitivity and selectivity needed to detect defects. Making the correct settings requires the calculation of the fault currents with as little error as possible. Fault currents are influenced by the parameters of the electrical networks, including the state of the insulation and the Petersen coil, which changes during their operation electrical networks. This paper analyzes how the insulation parameters of medium voltage power lines, the parameters of the Petersen coil used to treat the neutral of the medium voltage electrical network and the value of the resistance at the fault location influence the fault current in the case of a single-phase fault. The large number of single-phase faults that occur in medium voltage electrical networks justifies this analysis. The symmetrical components method was used to calculate the fault current. The results obtained by calculation were verified experimentally by causing a single-phase-to-ground fault in a real medium voltage network. The paper presents the situations in which the analytical calculation of the single-phase-to-ground fault current can lead to inadmissibly large errors, even over 50%, but also the situations in which the errors fall below 3%.
Autonomous Operation of Stationary Battery Energy Storage Systems—Optimal Storage Design and Economic Potential
Authors: Faessler Bernhard , Bogunović Jakobsen Aleksander
Published: March 2021

Global warming requires a changeover from fossil fuel based to renewable energy sources on the electrical supply side and electrification of the demand side. Due to the transient nature of renewables and fluctuating demand, buffer capacities are necessary to compensate for supply/demand imbalances. Battery energy storage systems are promising. However, the initial costs are high. Repurposing electric vehicle batteries can reduce initial costs. Further, storage design optimization could significantly improve costs. Therefore, a battery control algorithm was developed, and a simulation study was performed to identify the optimal storage design and its economic potential. The algorithm used is based on autonomous (on-site) optimization, which relies on an incentive determining the operation mode (charge, discharge, or idle). The incentive used was the historic day-ahead stock market price for electricity, and the resulting potential economic gains for different European countries were compared for the years 2015–2019. This showed that there is a correlation between economic gain, optimal storage design (capacity-to-power ratio), and the mean standard deviation, as well as the mean relative change of the different day-ahead prices. Low yearly mean standard deviations of about 0.5 Euro Cents per kWh battery capacity lead to yearly earnings of about 1 €/kWh, deviations of 1 Euro Cent to 10 €/kWh, and deviations of 2 Euro Cents to 20 €/kWh. Small yearly mean relative changes, lower than 5%, lead to capacity-to-power ratios greater than 3, relative changes around 10% to an optimal capacity-to-power between 1.5 and 3, and for relative changes greater than 10% to an optimal capacity-to-power ratios of 1. While in countries like the United Kingdom, high potential earnings are expected, the economic prospective in countries like Norway is low due to limited day-ahead price performance.
Perspective Design of Algae Photobioreactor for Greenhouses—A Comparative Study
Authors: Sukačová Kateřina , Lošák Pavel , Brummer Vladimír , Máša Vítězslav , Vícha Daniel , Zavřel Tomáš
Published: March 2021

The continued growth and evolving lifestyles of the human population require the urgent development of sustainable production in all its aspects. Microalgae have the potential of the sustainable production of various commodities; however, the energetic requirements of algae cultivation still largely contribute to the overall negative balance of many operation plants. Here, we evaluate energetic efficiency of biomass and lipids production by Chlorella pyrenoidosa in multi-tubular, helical-tubular, and flat-panel airlift pilot scale photobioreactors, placed in an indoor environment of greenhouse laboratory in Central Europe. Our results show that the main energy consumption was related to the maintenance of constant light intensity in the flat-panel photobioreactor and the culture circulation in the helical-tubular photobioreactor. The specific power input ranged between 0.79 W L−1 in the multi-tubular photobioreactor and 6.8 W L−1 in the flat-panel photobioreactor. The construction of multi-tubular photobioreactor allowed for the lowest energy requirements but also predetermined the highest temperature sensitivity and led to a significant reduction of Chlorella productivity in extraordinary warm summers 2018 and 2019. To meet the requirements of sustainable yearlong microalgal production in the context of global change, further development towards hybrid microalgal cultivation systems, combining the advantages of open and closed systems, can be expected.
Static Fatigue of SiC/SiC Minicomposites at High Temperatures Up to 1200 °C in Air: Multiscale Approach
Authors: Lamon Jacques , Laforêt Adrien
Published: March 2021

The present paper investigates the static fatigue behavior of Hi-Nicalon fiber-reinforced SiC–SiC minicomposites at high temperatures in the 900–1200 °C range, and under tensile stresses above the proportional limit. The stress–rupture time relation was analyzed with respect to subcritical crack growth in filaments and fiber tow fracture. Slow crack growth from flaws located at the surface of filaments is driven by the oxidation of free carbon at the grain boundaries. Lifetime of the reinforcing tows depends on the statistical distribution of filament strength and on structural factors, which are enhanced by temperature increase. The rupture time data were plotted in terms of initial stresses on reinforcing filaments. The effect of temperature and load on the stress–rupture time relation for minicomposites was investigated using results of fractography and predictions of minicomposite lifetime using a model of subcritical growth for critical filaments. The critical filament is the one whose failure by slow crack-growth triggers unstable fracture of the minicomposite. This is identified by the strength–probability relation provided by the cumulative distribution function for filament strength at room temperature. The results were compared to the fatigue behavior of dry tows. The influence of various factors related to oxidation, including multiple failures, load sharing, and variability, was analyzed.
Detection of Gadolinium with an Impedimetric Platform Based on Gold Electrodes Functionalized by 2-Methylpyridine-Substituted Cyclam
Authors: Touzi Hassen , Chevalier Yves , Martin Marie , Ben Ouada Hafedh , Jaffrezic-Renault Nicole
Published: March 2021

Gadolinium is extensively used in pharmaceuticals and is very toxic, so its sensitive detection is mandatory. This work presents the elaboration of a gadolinium chemical sensor based on 2-methylpyridine-substituted cyclam thin films, deposited on gold electrodes, using electrochemical impedance spectroscopy (EIS). The 2-methylpyridine-substituted cyclam (bis-N-MPyC) was synthesized in three steps, including the protection of cyclam by the formation of its CH2-bridged aminal derivative; the product was characterized by liquid 1H and 13C NMR spectroscopy. Spin-coated thin films of bis-N-MPyC on gold wafers were characterized by means of infrared spectroscopy in ATR (Attenuated Total Reflectance) mode, contact angle measurements and atomic force microscopy. The impedimetric chemical sensor was studied in the presence of increasing concentrations of lanthanides (Gd3+, Eu3+, Tb3+, Dy3+). Nyquist plots were fitted with an equivalent electrical circuit including two RC circuits in series corresponding to the bis-N-MPyC film and its interface with the electrolyte. The main parameter that varies with gadolinium concentration is the resistance of the film/electrolyte interface (Rp), correlated to the rate of exchange between the proton and the lanthanide ion. Based on this parameter, the detection limit obtained is 35 pM. The bis-N-MPyC modified gold electrode was tested for the detection of gadolinium in spiked diluted negative urine control samples.
Consistency of Suspended Particulate Matter Concentration in Turbid Water Retrieved from Sentinel-2 MSI and Landsat-8 OLI Sensors
Authors: Wang Hanghang , Wang Jie , Cui Yuhuan , Yan Shijiang
Published: March 2021

Research on the consistency of suspended particulate matter (SPM) concentration retrieved from multisource satellite sensors can serve as long-time monitoring of water quality. To explore the influence of the atmospheric correction (AC) algorithm and the retrieval model on the consistency of the SPM concentration values, Landsat 8 Operational Land Imager (OLI) and Sentinel 2 MultiSpectral Imager (MSI) images acquired on the same day are used to compare the remote sensing reflectance (Rrs) SPM retrieval values in two high-turbidity lakes. An SPM retrieval model for Shengjin Lake is established based on field measurements and applied to OLI and MSI images: two SPM concentration products are highly consistent (R2 = 0.93, Root Mean Squared Error (RMSE) = 20.67 mg/L, Mean Absolute Percentage Error (MAPE) = 6.59%), and the desired results are also obtained in Chaohu Lake. Among the four AC algorithms (Management Unit of the North Seas Mathematical Models (MUMM), Atmospheric Correction for OLI’lite’(ACOLITE), Second Simulation of Satellite Signal in the Solar Spectrum (6S), Landsat 8 Surface Reflectance Code & Sen2cor (LaSRC & Sen2cor)), the two Rrs products, as well as the final SPM concentration products retrieved from OLI and MSI images, have the best consistency when using the MUMM algorithm in SeaWIFS Data Analyst System (SeaDAS) software. The consistency of SPM concentration values retrieved from OLI and MSI images using the same model or same form of models is significantly better than that retrieved by applying the optimal models with different forms.
A Fringe Phase Extraction Method Based on Neural Network
Authors: Hu Wenxin , Miao Hong , Yan Keyu , Fu Yu
Published: March 2021

In optical metrology, the output is usually in the form of a fringe pattern, from which a phase map can be generated and phase information can be converted into the desired parameters. This paper proposes an end-to-end method of fringe phase extraction based on the neural network. This method uses the U-net neural network to directly learn the correspondence between the gray level of a fringe pattern and the wrapped phase map, which is simpler than the exist deep learning methods. The results of simulation and experimental fringe patterns verify the accuracy and the robustness of this method. While it yields the same accuracy, the proposed method features easier operation and a simpler principle than the traditional phase-shifting method and has a faster speed than wavelet transform method.
Deep Reinforcement Learning-Based Task Scheduling in IoT Edge Computing
Authors: Sheng Shuran , Chen Peng , Chen Zhimin , Wu Lenan , Yao Yuxuan
Published: March 2021

Edge computing (EC) has recently emerged as a promising paradigm that supports resource-hungry Internet of Things (IoT) applications with low latency services at the network edge. However, the limited capacity of computing resources at the edge server poses great challenges for scheduling application tasks. In this paper, a task scheduling problem is studied in the EC scenario, and multiple tasks are scheduled to virtual machines (VMs) configured at the edge server by maximizing the long-term task satisfaction degree (LTSD). The problem is formulated as a Markov decision process (MDP) for which the state, action, state transition, and reward are designed. We leverage deep reinforcement learning (DRL) to solve both time scheduling (i.e., the task execution order) and resource allocation (i.e., which VM the task is assigned to), considering the diversity of the tasks and the heterogeneity of available resources. A policy-based REINFORCE algorithm is proposed for the task scheduling problem, and a fully-connected neural network (FCN) is utilized to extract the features. Simulation results show that the proposed DRL-based task scheduling algorithm outperforms the existing methods in the literature in terms of the average task satisfaction degree and success ratio.
DRNet: A Depth-Based Regression Network for 6D Object Pose Estimation
Authors: Jin Lei , Wang Xiaojuan , He Mingshu , Wang Jingyue
Published: March 2021

This paper focuses on 6Dof object pose estimation from a single RGB image. We tackle this challenging problem with a two-stage optimization framework. More specifically, we first introduce a translation estimation module to provide an initial translation based on an estimated depth map. Then, a pose regression module combines the ROI (Region of Interest) and the original image to predict the rotation and refine the translation. Compared with previous end-to-end methods that directly predict rotations and translations, our method can utilize depth information as weak guidance and significantly reduce the searching space for the subsequent module. Furthermore, we design a new loss function function for symmetric objects, an approach that has handled such exceptionally difficult cases in prior works. Experiments show that our model achieves state-of-the-art object pose estimation for the YCB- video dataset (Yale-CMU-Berkeley).
The Impact of Notification Modality and Ambient Sound on Users’ Mobile Interaction
Authors: Chen Chien-Hsiung , Huang Miao
Published: March 2021

This study investigated the impacts of different notification modalities used in low and high ambient sound environments for mobile phone interaction. Three different notification modalities—Shaking Visual, Shaking Visual + Vibration, and Vibration—were designed and experimentally tested by asking users to conduct a maze task. A total of 72 participants were invited to take part in the experiment through the convenience sampling method. The generated results indicated that (1) the notification modality affects participants’ task completion time, (2) the error rate pertinent to the number of notifications is positively related to the participants’ task completion time, and (3) the ambient sound level and notification modalities impact the overall experience of the participants. The main contributions of this study are twofold. First, it verifies that the multi-dimensional feature of a Shaking Visual + Vibration synesthesia notification design is implementable. Second, this study demonstrated that the synesthesia notification could be feasible for mobile notification, and it was more perceptible by the users.
Program Geliştirme Çalışmaları Üzerine Bir Değerlendirme: İngiltere Ulusal Programı
Authors: KIZILKAYA Hatice
Published: March 2021

Eğitimde program geliştirme çalışmaları tüm ülkelerde, toplumların yaşadığı bir takım değişim ve dönüşümler

sonucunda, sürekli geliştirilmesi ve yenilenmesi gerekliliğinin ortaya çıktığı benzer süreçlerden geçmektedir.

Eğitimin, toplumun kültürel değerlerini gelecek nesillere aktarma işlevi göz önünde bulundurulduğunda, yaşanılan

kültürel ve sosyal tüm bu değişim ve dönüşümlerin dikkate alınarak eğitim programlarının geliştirilmesi ve

düzenlenmesi gerekmektedir. Eğitim programları toplumların değişen ihtiyaçları içerisinde gelişen sistemli ve

sürekli programlardır. Bu çalışmada, program geliştirme çalışmalarındaki temel amaçlar ve program geliştirme

çalışmalarına bir örnek olarak İngiltere Ulusal Programı incelenmiştir. Çalışmada ayrıca Yeni Eğitim Programı

Hareketi’nin İngiltere Ulusal Programı’na etkileri ve bu etkilerin programın amaçlarına nasıl yansıdığı ortaya

konulmuştur.
Okul Öncesi Öğretmenlerinin Sınıf İçi Fen Uygulamalarına Yönelik Tutumu Ve Uygulama Analizi
Authors: POLAT Sinan , ZENGİN Raşit , ELMALI Filiz
Published: March 2021

Bireylerin dünyayı anlayabilmeleri ve uyum sağlayabilmeleri için okul öncesi dönem kritik bir öneme sahiptir.

Okul öncesi eğitimde çocuklar araştırarak, yaparak yaşayarak, bilginin farkına varmayı, bilgiyi kullanmayı ve

geliştirmeyi öğrenirler. Bu çalışmada okul öncesi öğretmenlerinin fen eğitimine yönelik tutumları, sınıf içinde

kullandıkları yöntem-teknikler ve sınıf içi aktiviteleri kullanım oranları incelenmiştir. Araştırma yöntemi nitel ve

nicel veriler kullanılarak karma modelle oluşturulmuştur. Araştırmanın çalışma grubu 20 anaokulunda görev yapan

tesadüfi yöntemle seçilmiş olan 118 öğretmenden oluşmaktadır. Araştırma verileri kişisel ve mesleki bilgiler formu

ile toplanmış. Verileri oluşturulurken formlara ek olarak, katılımcı öğretmenlerin yıllık planları incelenmiş olup

en çok fen etkinliği yapan okulun öğretmenlerinin sınıf içi etkinlikleri video kayıtları halinde analiz edilmiştir.

Sınıf içi etkinlik videoları, Llewellyn ’in yapılandırmacı araştırma döngüsüne göre irdelenmiştir. Elde edilen

bulgulardan çeşitli sonuçlara ulaşılmıştır. Okul öncesi öğretmenlerinin fen bilimlerine yönelik tutumlarının olumlu

düzeyde olduğu saptanmıştır. Öğretmenlerin gezi-gözlem aktivitesini %78.3, deneyi % 90.6, fen ve doğa köşesini

% 92.5, oyuncak kullanımını % 64.2 ve hayvan besleme aktivitesini % 41.5 oranlarında kullandıklarını

belirtmişlerdir. Video analizlerinde ise öğretmenlerin gezi ve gözlem aktivitesini aktif olarak kullanmadıkları

görülürken sınıf içi ders etkinlikleri analiz edildiğinde deney etkinliklerinin yapıldığı ancak deney yaparken

öğrencilerin aktif olmadığı saptanmıştır. Bu sonuçlara göre öğretmen ve eğitimcilere çeşitli öneriler sunulmuştur.
Sistem Informasi Pelayanan Jasa pada Lucky Photo
Authors: Pradita T , Mubarok A
Published: March 2021

The development of services has developed into the internet media, to make it easier for customers and employees in managing a job. In the problem of Lucky Photo, which covers services including printing, sales, stock of goods, purchases, and reports are not effective properly. The researcher aims to develop a service system entitled Service Information Systems at Lucky Photo. By building a web-based application, a waterfall method is needed to become a benchmark for the creation of a service information system, so the results will be obtained on a web-based application system to demand progress in a company, including services that become easier, easier customer service in conduct transactions, generate reports, and process customer data. So it can be concluded that with the construction of a new Service Information System it will be easier to make transactions, make it easier for customers, create reports, and process customer data that is embedded in the Mysql database which will become a well-systemized report.
Tätheten av gransångare Phylloscopus c. collybita och lövsångare Phylloscopus trochilus i ett sydsvenskt villaområde
Authors: Marling Sven
Published: March 2021

The expansion of the Chiffchaff Phylloscopus c. collybita in southern Sweden during the last decades is well documented. Regionally the densities of the Chiffchaff now even exceed the densities of the ubiquitous Willow Warbler Phylloscopus trochilus. However, there are few quantitative studies on Chiffchaff densities, not least from urban areas. During spring 2013 a survey of singing Chiffchaffs and Willow Warblers, complemented by territory mapping, was conducted in three villa suburb areas (total ea 1.27 km2) and a nearby recreational area in the southwestern parts of the city of Malmö, Sweden. The villa areas held a substantially higher number of Chiffchaffs (16.5 pairs/km2) than Willow Warblers (6.3 pairs/ km2). In one villa sub-area, with little undergrowth and denser housing, there were no Willow Warblers at all, in contrast to the recreational area close to the villa areas, where the Willow Warbler dominated (10.9 pairs/km2). The Chiffchaff had its highest density (18.7 pairs/km2) in the sub-area that had the largest trees. Thus, in the investigated villa suburb, the Chiffchaff clearly outnumbered the Willow Warbler as a breeding bird.
Age of Great Grey Owls Stirix nebulosa observed in Scandinavia in 2012 as revealed by digital photos in the national species report archives
Authors: Solheim Roar
Published: March 2021

Record breaking numbers of breeding Great Grey Owls Strix nebulosa were reported in Sweden and Norway in 2010 and 2011, followed by 4,105 observations in 2012 as revealed by the national Species archives. Based on locality id numbers, at least 144 individuals were reported with photos which could be used to age the individuals. The majority (76%) of these birds were young birds hatched in 2011 (83% including birds aged probably 2CY). Among dead owls brought to the Natural History Museum in Stockholm, the percentages of owls hatched in 2011 were similar (78% and 88%). The high percentage of young owls could be caused by young birds hunting closer to human settlement than older birds, but more likely it was caused by a higher total production of young in south-central Scandinavia in 2011 than in 2010. This study shows that photos in the national species archives reveal the age structure of the Great Grey Owl population, fundamental data to understand the current distributional expansion of this species. This method may also be applied to other species.
Different Letters / Groups of Different Letters in the Different Words of English Language Beginning with the Alphabets ‘R’, ‘S’, ‘T’, ‘V’, ‘W’, ‘X’, ‘Y’ and ‘Z’ having Same Pronunciation
Authors: Koli Uttam Balu
Published: March 2021

The present research article is about the different letters / groups of different letters in the different words of English language beginning with the alphabets ‘R’, ‘S’, ‘T’, ‘V’, ‘W’, ‘X’, ‘Y’ and ‘Z’ having same pronunciation. At the outset, the importance of pronunciation in English language has been given in brief. The different letters / groups of different letters in the different words of English language beginning with the select alphabets, having same pronunciation, have been mentioned with their total numbers separately and their description with examples including words and phonetic transcriptions have been detailed. It has been concluded with the view that if one knows the particulars in the pronunciation of different letters / groups of different letters in the different words of English language having same pronunciation, he / she will find the mastery over the pronunciation of different words in English language. It ends with references.
Kinds of Ode: A Comparative Study
Authors: Udhayakumar S
Published: March 2021

This paper brings a comparative analysis of three types of ode poems, i.e., the Pindaric, Horatian and Irregular odes. Its major focus is on the evolutionary changes of odes from its inception at Grecian to English Romantic odes which were greatly influenced by many like Roman influence, Italian influence, Renaissance and Romantic period etc. Moreover the paper gives a clear picture of ode poetry, its characteristics, form and structure and the functions of each type. Through a comparative study the distinct characteristics of the three types are explicated. Some of the ode poems of English poetry such as “The progress of Poesy: A Pindaric ode” by Thomas Grey, “Ode on Solitude” by Alexander Pope and “Ode on a Grecian Urn” by John Keats have been taken as the English models of the three kinds respectively. These poems where compared with the original classical models and critically analyzed.
EFEKTIVITAS DAN EFISIENSI MODAL KERJA DALAM MEMPENGARUHI PEROLEHAN RETURN ON ASSET PADA PERUSAHAAN SEMEN YANG TERDAFTAR DI BURSA EFEK INDONESIA
Authors: Alhidayatullah Alhidayatullah
Published: March 2021

This study aims to determine cash turnover, accounts receivable turnover, inventory turnover, working capital turnover in influencing return on assets (ROA) in cement companies listed on the Indonesia Stock Exchange for the period 2016 - 2019. This study uses an explanatory analysis method with a quantitative approach, namely a research method that intends to explain the position of the variable under study and the causal relationship between one variable and another through hypothesis testing and focuses on variable problems with concepts that have value and looking for relationships between these variables. Hypothesis test results show that cash turnover to ROA is tcount -1,204  0,05, turnover of accounts receivable to ROA is calculated from tcount 0.078  0.05, inventory turnover at ROA where the value of t count -1.099  0.05, and the turnover of working capital to ROA, the calculation is t count 0.628  0.05, which explains that all independent variables have no significant effect on ROA. While cash turnover, accounts receivable turnover, inventory turnover, and working capital turnover together (simultaneously) do not have a significant effect on return on assets, the calculation results show Fcount 0.672  0.05. Based on the analysis of the coefficient of determination, the effect of cash turnover, accounts receivable turnover, inventory turnover, and working capital turnover on return on assets is 27.8%, the remaining 72.2% is influenced by other factors not examined.
Validitas dan Efektifitas Modul Pembelajaran Kimia Terintegrasi STEM-PBL Topik Pakan Jeroan Ikan Untuk Ikan Lele dan Topik Lain Pada Mata Kuliah Kewirausahaan
Authors: Zuriyatina Rahma , W K Anom , Sari Diah Kartika
Published: March 2021

Penelitian ini merupakan penelitian pengembangan yang bertujuan menghasilkan modul pembelajaran kimia yang berjudul pakan jeroan ikan untuk pertumbuhan ikan lele terintegrasi STEM-PBL yang valid, praktis, dan efektif. Model pengembangan yang digunakan adalah model ADDIE dan dievaluasi dengan menggunakan metode evaluasi formatif Tessmer. Tahapan evaluasi formatif Tessmer dalam penelitian ini meliputi self evaluation, expert review, one-to-one, dan small group. Hasil tahapan expert review memperoleh skor rata-rata kevalidan sebesar 0,81 skala Aiken dengan kategori kevalidan tinggi. Hasil skor akhir kepraktisan pada uji one-to-one sebesar 0,91 skala Aiken (kepraktisan tinggi) dan small group 0,81 skala Aiken (kepraktisan tinggi). Hasil tahapan field test menunjukan skor akhir n-gain adalah sebesar 0,796 dengan kategori tinggi. Hasil penelitian menunjukkan bahwa modul pembelajaran kimia terintegrasi STEM-PBL telah memenuhi kriteria valid, praktis dan efektif yang dapat digunakan dalam pembelajaran mata kuliah kewirausahaan.

Kata kunci: Penelitian Pengembangan, Modul Pembelajaran

Kimia, STEM-PBL, Pakan Jeroan Ikan Untuk

Pertumbuhan Ikan Lele.
Pengaruh Penggunaan Aplikasi Edmodo terhadap Pemahaman Konsep Hidrolisis Garam Siswa SMA ‎Negeri 1 Suwawa
Authors: Linggama Fadila , Lukum Astin , Paputungan Mardjan
Published: March 2021

Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan aplikasi Edmodo terhadap pemahaman konsep siswa pada materi hidrolisis garam. Jenis penelitian adalah penelitian kuantitatif dengan desain nonequivalent control group design. Pengambilan sampel dilakukan dengan menggunakan tehnik sampling purposive. Sampel penelitian untuk kelas ekperimen dan kelas kontrol masing-masing berjumlah 25 siswa. Pengumpulan data menggunakan tes objektif sebagai instrumen yaitu tes berisi tentang materi hidrolisis garam. Tehnik analisis data untuk menguji hipotesis penelitian adalah statistik uji-t. Hasil penelitian diperoleh nilai rata-rata post-tes kelas ekperimen dengan menggunakan aplikasi edmodo yaitu 79,73 sedangkan untuk kelas kontrol dengan menggunakan model pembeajaran discovery learning nilai rata-rata post-tes yaitu 55,46. Hasil analisis data untuk pemahaman konsep siswa menunjukan bahwa dalam taraf nyata 0,05 diperoleh nilai thitung > ttabel atau 20,06 > 1,67 dengan criteria pengujian terima H1. Dengan demikian dapat disimpulkan bahwa terdapat pengaruh Penggunaan Aplikasi Edmodo terhadap pemahaman konsep siswa pada materi hidrolisis garam.
Reevaluación del género Andonectes Guéorguiev, 1971 y establecimiento de nuevas combinaciones para el género Platynectes (Agametrus) Régimbart, 1879 (Coleoptera: Dytiscidae: Agabinae) en Venezuela
Authors: García Mauricio
Published: March 2021

Se reevaluaron las especies de Andonectes Guéorguiev depositadas en la colección del Museo de Artrópodos de La Universidad del Zulia (Maracaibo, Venezuela), y se consideró que los caracteres taxonómicos atribuidos previamente no coincidían con la actual definición del género, pero si calzan con los de Platynectes Régimbart, subgénero Agametrus Sharp. A partir de esto, se establecen doce nuevas combinaciones taxonómicas: Platynectes (Agametrus) apure (García), P. (Agametrus) bordoni (García), P. (Agametrus) gregarius (García), P. (Agametrus) intermedius (García), P. (Agametrus) meridensis (García), P. (Agametrus) mildredae (García), P. (Agametrus) milla (García), P. (Agametrus) pineiroi (García), P. (Agametrus) septentrionalis (García), P. (Agametrus) similaris (García), P. (Agametrus) trujillo (García) y P. (Agametrus) venezuelanus (García). Adicionalmente se considera en nomina nuda a Andonectes boconoenses García, A. llanerum García y A. ellesae García, y se corrigen errores nominales para algunas especies descritas originalmente en el género Andonectes. Se ilustran los habitus dorsales, caracteres de interés diagnóstico y órganos genitales del macho y de la hembra de una especie. En un mapa se consigna la distribución de todas las especies de Agametrus dadas para Venezuela.
Estudio de imágenes de campaña de PRO: ¿propaganda o realidad?
Authors: Cicowiez Mariano
Published: March 2021

Las imágenes en movimiento de uso electoral difundidas por el partido PRO, integrante de la coalición Cambiemos, en la campaña nacional argentina 2015, fundaron un estilo de composición tributario del realismo revelador, cuyo principal exponente teórico comprende a la obra de André Bazin. El estudio que presentamos acerca de la norma de diseño de los spots televisivos se focaliza en la recuperación de técnicas de registro examinadas por el autor francés, con objeto de reconocer las estructuras significantes y sus modos de reproducción audiovisual en una serie de unidades de observación, cuya circulación remitió a la jornada de preselección de candidaturas. Para ello ha sido elaborado un corpus de trabajo compuesto por anuncios proselitistas, a partir del cual se conformó un estudio intertextual acerca de la transparencia u opacidad que determinaron los avisos de la fuerza electoral. Las conclusiones de nuestro estudio indican que en sus imágenes técnicas PRO se abocó a la exposición del universo de referencia, y de este modo a ocultar el artificio de filmación.
POTENSI Nannochloropsis oculata DAN Tetraselmis chuii SEBAGAI BAHAN BAKU BIOETANOL
Authors: SP Negara Bertoka Fajar , Irfandi Irfandi , Nursalim Nining , Herliany Nurlaila Ervina
Published: March 2021

Bahan bakar fosil yang semakin menipis menimbulkan permasalahan baru dalam mewujudkan ketahanan energi didunia. Bioetanol merupakan salah satu bahan bakar alternatif yang ramah lingkungan dan bersifat terbarukan. Penelitian ini bertujuan untuk memperoleh jumlah bioetanol yang dihasilkan dari fermentasi biomassa Nannochloropsis oculata dan Tetraselmis chuii. Kultur Nannochloropsis oculata dan Tetraselmis chuii selama 5 hari, hidrolisis asam dilakukan dengan menggunakan H2SO4 0,2 M dengan suhu 121 oC dan tekanan 1 atm selama 30 menit, fermentasi menggunakan Saccaromyces cereviciae selama 5 hari. hasil hidrolisis Nannochloropsis oculata memiliki kadar gula sebesar 4%, hasil fermentasi Nannochloropsis oculata mengandung etanol sebanyak 12 mL dengan konsentrasi 4%. Hasil hidrolisisyang dilakukan menghasilkan kadar gula 4%. Hasil fermentasi menghasilkan 1% bioetaniol.
IDENTIFIKASI PENYAKIT DAN GANGGUAN KESEHATAN TERUMBU KARANG DI PERAIRAN DESA LANGGAPULU KONAWE SELATAN SULAWESI TENGGARA
Authors: Riska Riska , Lalang Lalang , Kamur Sudarwin , Wahab Iswandi , Maharani Maharani
Published: March 2021

Ekosistem terumbu karang merupakan salah satu organisme laut yang rentan terhadap perubahan lingkungan perairan. Salah satu dampak akibat perubahan lingkungan tersebut adalah munculnya berbagai penyakit dan gangguankesehatan karang. Penelitian ini bertujuan untuk mengetahui kondisi terumbu karang dan mengindetifikasi jenis-jenis penyakit dan gangguan kesehatan yang mengancam ekosistem terumbu karang di perairan Desa Langgapulu. Metodetransek garis (line intercept transect) sepanjang 50 m digunakan untuk menggambarkan kondisi terumbu karang dengan melihat persentase penutupan karang hidup, karang mati, alga, dan keberadaan biota lainnya. Metode belt transek dengan ukuran 5 m x 50 m digunakan untuk mengidentifikasi penyakit dan gangguan kesehatan karang, pada 4 stasiun pengamatan. Hasil penelitian menunjukkan bahwa kondisi terumbu karang di perairan tersebut dalam kategorisedang hingga buruk/rusak. Jenis penyakit karang yang ditemukan pada perairan ini yaitu Black Band Disease (BBD), Brown Band Disease (BRBD), Dark Spots Disease (DSD), Pink Boctch (PB), Skeletal Eroding Band (SEB), dan White Syndromes (WS). Gangguan kesehatan karang umumnya disebabkan karenapemutihan karang (Bleaching), Crown of Thorns Starfish, Growth Anomalies, Pigmentation Response, Sediment Damage, dan Tube Former. Penurunan kualitas lingkungan perairan sangat berperan terhadap munculnya berbagai penyakit dan gangguan terhadap kesehatan karang, yang berdampak pada gangguan secara fisiologis bagi biota karang.
TINGKAT KESUBURAN PERAIRAN KOLONG PASCA GALIAN TAMBANG PASIR SIDODADI, PULAU SUGI BAWAH, PROVINSI KEPULAUAN RIAU
Authors: Agung Sunartri , Apriadi Tri , Melani Winny Retna
Published: March 2021

Kolong Sidodadi merupakan genangan perairan yang terbentuk di lahan pasca tambang pasir darat di Pulau Sugi Bawah, tepatnya di Kampung Sidodadi, Kecamatan Moro, Kabupaten Karimun. Kolong ini dimanfaatkan sebagai sumber air baku oleh PDAM Tirta Karimun. Penelitian ini bertujuan untuk mengkaji kondisi parameter fisika, kimia, dan biologi serta tingkat kesuburan perairan Kolong Sidodadi, Kabupaten Karimun, Kepulauan Riau. Pengambilan sampel dilakukan secara random sampling sebanyak 30 titik sampling yang tersebar di Kolong Sidodadi. Parameter fisika, kimia, dan biologi perairan yang diukur yaitu suhu, kecerahan, pH, DO, nitrat, fosfat, dan klorofil-a. Kualitas perairan dianalisisberdasarkan kesesuaian baku mutu menurut Peraturan Pemerintah Republik Indonesia No. 82 Tahun 2001. Indeks kesuburan dihitung menggunakan metode Trophic Level Index (TLI). Hasil penelitian menunjukkan bahwa Kolong Sidodadi memiliki pH asam (rendah), konsentrasi nutrien N dan P tinggi, serta klorofil-a rendah. Nilai kesuburan berdasarkan indeks TLI berkisar 3,60-4,40 dengan rataan 4,00. Tingkat kesuburan perairan Kolong Sidodadi tergolong eutrofik (tinggi). Perlu menjadi perhatian terhadap nilai pH yang rendah karena air Kolong Sidodadi ini digunakan sebagai sumber air baku bagi PDAM Tirta Karimun. Selain itu, diperlukan kajian keanekaragaman dan kelimpahan fitoplankton sehingga dapat mengkonfrimasi konsentrasi klorofil-a yang menjadi komponen utama dalam penentuan tingkat kesuburan perairan.
Analisis Motor Listrik Tipe Synchronous dengan Metode Komputasi
Authors: Julian James , Wahyuni Fitri , Mula Tua Lomo , Toding Bunga Nely
Published: March 2021

In the current technological development, the electric motor is the most popular in various industrial applications. Electric motors today have evolved very quickly and have a significant impact on the lives of the wider community. The use of environmentally friendly and efficient energy is one of the reasons why this motorbike has become a pioneer of technological advances, especially in the automotive world. This research focuses on conducting a comprehensive analytical study on one type of electric motor, namely synchronous because it is widely applied in various conditions today. The analysis was carried out using a computational method by applying the finite element as a method of solving the magnetic field case involving Maxwell's equations and its impact on the torque generated in this synchronous motor. From the computation results, it is found that this synchronous motor does have a high torque when the magnetic field flux works constantly at 0.015 Wb. With an average torque generated by this synchronous motor of 1.5 kW.
Acerca de la desaparición del antefuturo de subjuntivo del español peninsular
Authors: Sobczak Witold
Published: March 2021

El presente artículo gira en torno a la eliminación del antefuturo de subjuntivo (hubiere cantado) del español peninsular. Además de analizar la historia, el empleo y las causas de la desaparición de dicha forma, el autor aprovecha los datos recopilados en el corpus CORDE para registrar los primeros síntomas de su debilidad en el sistema verbal castellano.
Lía Schwartz, in memoriam
Authors: Montero Reguera José
Published: March 2021

Homenaje a Lía swartz
ГРОМАДСЬКА ІНІЦІАТИВА В УКРАЇНІ ЯК ЧИННИК СОЦІАЛЬНО-ЕКОНОМІЧНОГО РОЗВИТКУ
Authors: Дідківська Леся
Published: March 2021

Представлено результати історико-економічного дослідження ролі громадських інституцій у формуванні ринкових відносин. Розкрито характер еволюції недержавних організацій у період становлення інститутів централізовано-розподільчої системи та визначено роль цих організацій у процесі згортання ринку. Метою даної публікації є економічний аналіз діяльності громадських інституцій в історичній ретроспективі, характеристика головних сучасних тенденцій розвитку громадських ініціатив в контексті соціально-економічного розвитку України.
РОЗВИТОК ПАРЛАМЕНТАРИЗМУ КРАЇН ЄВРОПЕЙСЬКОГО СОЮЗУ В СУЧАСНІЙ НУМІЗМАТИЦІ
Authors: Кривцов Артем , Царенко Олена
Published: March 2021

Дана робота присвячена актуальній темі – розвитку законодавчих органів країн Європейського Союзу, зокрема: Мальти, Фінляндії, Ірландії та Німеччини в сучасній нумізматиці. Досліджено пам’ятні та ювілейні монети, які присвячені важливим подіям, пов’язаними з розвитком парламентської діяльності країн.
ЕКОНОМІЧНА ЕФЕКТИВНІСТЬ ПРИ ЗАСТОСУВАННІ ГЕТЕРОЗИСНИХ ФОРМ ТЮТЮНУ АПОМІКТИЧНОГО ТИПУ РОЗМНОЖЕННЯ
Authors: Глюдзик-Шемота Маргарита
Published: March 2021

У статті розкрито питання детальної оцінки колекційного матеріалу тютюну, її економічну ефективність при застосуванні явища гетерозису та рослин апоміктичного типу розмноження. Матеріали свідчать про високу окупність витрат, які були спрямовані на впровадження сортів-апоміктів.
ІННОВАЦІЙНІ РОЗРОБКИ ІЗ ЗАХИСТУ ОЛІЙНИХ КУЛЬТУР В УКРАЇНІ
Authors: Круть Михайло
Published: March 2021

За допомогою феромонних пасток можна своєчасно встановлювати строки початку та тривалість льоту озимої совки. Розроблено інтерактивну програму «Захист рослин», яка включає пакет комп’ютерних програм недоборів урожаю ріпаку й соняшнику від комплексу шкідників. Досліджено механізми стійкості соняшнику, сої, льону олійного проти збудників основних захворювань та розроблено наукові основи щодо створення сортів і гібридів соняшнику з комплексною стійкістю до вовчка й несправжньої борошнистої роси. Виявлено джерела стійкості сої до комплексу хвороб (бактеріози, вірози, мікози) та створено базу даних щодо стійких сортів і селекційних зразків. Розроблено та вдосконалено екологічно безпечні технології захисту соняшнику, ріпаку й сої в різних грунтово-кліматичних зонах України. Створено значний арсенал інноваційної продукції із карантину рослин, пов’язаний із захистом олійних культур.
ТЕХНІКО-ЕКОНОМІЧНЕ ОБҐРУНТУВАННЯ КЕРОВАНОЇ ПОПЕРЕЧНОЇ КОМПЕНСАЦІЇ В МАГІСТРАЛЬНИХ ЛІНІЯХ ЕЛЕКТРОПЕРЕДАВАННЯ
Authors: Кучанський В. , Малахатка Д.
Published: March 2021

Керовані пристрої компенсації є найбільш перспективні в якості коштів поперечної компенсації в протяжних лініях вищих класів напруги. Їх основне призначення - плавна зміна споживання надлишкової реактивної потужності ліній електропередачі з метою нормалізації рівнів напруг. У статті на прикладі електропередачі 750 кВ показана методика оцінки додаткового ефекту від застосування керованого пристрою компенсації: зниження втрат активної потужності в лініях
КОНЦЕПТУАЛЬНА МОДЕЛЬ ІНФОРМАЦІЙНОЇ СИСТЕМИ УПРАВЛІННЯ ЯКІСТЮ ВЕРШКОВОГО МАСЛА
Authors: Криворучко Олена , Костюк Юлія , Самойленко Юлія
Published: March 2021

Розглядається комплекс інформаційних систем, які використовують методи діагностики та прогнозування із функціями підтримки прийняття рішень щодо регулювання параметрів технологічного процесу виробництва вершкового масла. Запропоновано архітектуру інформаційної системи управління якістю. Наведено діаграму послідовності етапів її створення.
EXPERIENCE OF EUROPEAN COUNTRIES IN THE FORMATION OF ENTREPRENEURIAL COMPETENCE
Authors: Mukha Anna
Published: March 2021

The article deals with issues related to the formation of entrepreneurial competence of school students in the European countries, such as Finland, Sweden, and the Netherlands. The article describes the skills and activities of teachers focused on the development of entrepreneurial competence, on the formation of an active life position of school students, focuses on increasing the learning motivation of school students in project activity.
КАШЬЯПА МАТАНГА, ДХАРМАРАТНА ТА АНЬ ШИГАО ЯК СПІВЗАСНОВНИКИ БУДДІЙСЬКОЇ ПЕРЕКЛАДАЦЬКОЇ ТРАДИЦІЇ «ПІДНЕБЕСНОЇ ІМПЕРІЇ»: ДО СТУДІЙ БУДДІЙСЬКОЇ ЛІТЕРАТУРИ КИТАЮ ДОБИ ХАНЬ
Authors: Щербаков Ярослав
Published: March 2021

У пропонованому дослідженні розглядається самий ранній етап проникнення до Китаю та китаїзації буддійського вчення. Ключову увагу дослідження приділено діяльності трьох перекладачів: Дхармаратни, Кашьяпи Матанги та Ань Шигао, що прибули в Китай на початку першого тисячоліття та здійснили переклад і компіляцію буддійських канонів китайською мовою. У науковій розвідці проаналізовано найдавніший буддійський канон китайською мовою «Канон із сорока двох розділів», особливості перекладацьких трансформацій, що були допущені при перекладі канону, синкретичний характер раннього буддизму у Китаї.
МЕРЕЖЕВА ПОЛІТІЯ У КОНТЕКСТІ СТАНОВЛЕННЯ РЕЖИМУ КОЛАБОРАЦІЙНОГО УПРАВЛІННЯ
Authors: Сичова Анастасія
Published: March 2021

Концепція мережевої політії розглядає державу як елемент, інтегрований в соціум, що переслідує власні цілі через мережу приватних або некомерційних організацій. При цьому державні та громадські структури набувають форми децентралізованих установ з широкою базою контактів і високим рівнем координації, що знаходяться поза функціональних кордонів суб’єктів взаємодії. Відносини між такими організаціями будуються на основі обміну ресурсами навколо спільних проєктів, де роль держави полягає в розширенні прав і можливостей зацікавлених сторін і полегшенні співпраці між ними.
БОРОТЬБА З «ВОРОГАМИ НАРОДУ» У НАВЧАЛЬНО-ВИХОВНОМУ ПРОЦЕСІ РАДЯНСЬКОЇ ОСВІТИ 1920-1930-Х РОКІВ
Authors: Бривко Микола , Курило Віталій
Published: March 2021

У даному дослідженні використовуючи змістовне наповнення навчально-освітньої діяльності педагогів радянських закладів освіти демонструється процес формування в дитячій свідомості ідеї боротьби з «ворогами народу» і місце в цьому учителів радянської України у період 1920-1930-х років, як активних провідників ідей комуністичного режиму під час активного становлення радянської тоталітарної системи. На конкретних прикладах боротьби, зокрема з «куркулями» або з релігією, ілюструється яким чином закріплюється в дитячій свідомості політика політичних репресій проти так званих «ворогів народу», які були в уяві радянських партійних і урядових діячів того часу.
СКІЛЬКИ ВЕЗІННЯ, ВЛАСНИХ ЗУСИЛЬ І ЗВ’ЯЗКІВ НЕОБХІДНО ДЛЯ ЗНАХОДЖЕННЯ ПЕРСПЕКТИВНОЇ РОБОТИ?
Authors: Шатілова Олександра
Published: March 2021

У статті висвітлюються результати дослідження уявлень студентів-менеджерів щодо перспектив знаходження роботи. Було встановлено, що: 1) пандемія коронавірусу не впливає на уявлення студентів-менеджерів щодо кар’єрних перспектив; 2) для знаходження перспективної роботи загалом в Україні та в міжнародній компанії, на думку студентів-менеджерів, необхідно 23% везіння, 51% власних зусиль, 26% зв’язків; 3) для знаходження перспективної роботи у сфері менеджменту, на думку студентів-менеджерів, необхідно 23% везіння, 48% власних зусиль, 29% зв’язків; 4) для знаходження перспективної роботи у сфері державного управління, на думку студентів-менеджерів, необхідно 18% везіння, 37% власних зусиль, 45% зв’язків, що може вказувати на проблему корупції в органах держуправління.
ОСОБЛИВОСТІ ІКОНОПИСНОЇ МАНЕРИ І. ЇЖАКЕВИЧА СЕРЕДИНИ ХХ СТОЛІТТЯ НА ПРИКЛАДІ ІКОНИ «СВЯТИЙ ТРИФОН» (ЦЕРКВА ПОКРОВА ПРЕСВЯТОЇ БОГОРОДИЦІ, ПРІОРКА М. КИЇВ)
Authors: Шашкова Агнета , Тимченко Тетяна
Published: March 2021

в статті розглянуто особливості авторської манери І. Їжакевича в іконописі середини ХХ століття на прикладі ікони «Святий Трифон» (1943-1945 рр.) із Церкви Покрова Пресвятої Богородиці на Пріорці. На основі порівняльного аналізу визначаються особливості зображення головних та другорядних фрагментів, а також основні художні прийоми, що використовував іконописець. Зважаючи на помічені спільні риси, проводиться паралель між іконописними та ілюстративними творами мистця означеного періоду, встановлюються причини їх взаємовпливу.
Single perceptron operating at 12 GigaOPs based on a Kerr soliton crystal microcomb for versatile, high-speed, scalable, optical neural networks
Authors: Moss David
Published: March 2021

Optical
artificial neural networks (ONNs) have significant potential for ultra-high
computing speed and energy efficiency. We report a novel approach to ONNs that
uses integrated Kerr optical micro-combs. This approach is programmable and
scalable and is capable of reaching ultra-high speeds. We demonstrate the basic
building block ONNs — a single neuron perceptron — by mapping synapses onto 49
wavelengths to achieve an operating speed of 11.9 x 109 operations
per second, or Giga-OPS, at 8 bits per operation, which equates to 95.2
gigabits/s (Gbps). We test the perceptron on handwritten-digit recognition and
cancer-cell detection — achieving over 90% and 85% accuracy, respectively. By scaling
the perceptron to a deep learning network using off-the-shelf telecom
technology we can achieve high throughput operation for matrix multiplication
for real-time massive data processing.