bluuebunny/crossref_metadata_2025 huggingface dataset:
Technological innovation and competitive advantage in telecommunication companies in Kenya
Authors: Mugo Peter C , Macharia Jimmy
Published: September 2020

Previous studies have established that the telecommunications industry in Kenya is characterized by decreasing voice revenues, many regulations, technological progress and varying consumer needs. This phenomenon has resulted in industry companies developing sound innovation strategies to make sure they form a competitive advantage over their rivals with the aim of ensuring their survival and growth in the evermore cut-throat marketplace. Nevertheless, in spite of the essential part played by these innovation strategies to safeguard competitive advantage, several companies have failed to translate the plans into reality. Therefore, the major objective of this study was to investigate the influence of technological innovation on the competitive advantage of telecommunication companies in Kenya. Technological innovation was measured by expansion of Global System for Mobile Communications (GSM) networks; new equipment and software; and partnerships and synergies. To satisfy the objective of this paper, a positivist philosophical stance was adopted and research design using cross-sectional survey data used. Data was collected using proportionate sampling from 247 managers. The results indicate that technological innovation improves the competitive advantage of telecommunication companies in Kenya. However, with government regulation as a moderating variable, only the new equipment, and software constructs had a positive and significant influence on the dependent variable. Ultimately, the findings suggest that government regulation moderates the influence of technological innovation on the competitive advantage of telecommunication companies in Kenya.
Video 2: Busy as a Bee
Authors: Schudel Ingrid
Published: September 2020

Intended audience: Year three primary school teachers and learners

This video is designed to support cross-curriculum teaching for third year primary school learners. The video uses ‘big numbers’ in mathematics to help learners understand how hard bees work to make honey. The video was inspired by the Mathematical Literacy researcher Terezhina Nunes who has demonstrated the incredible power of children’s mathematical reasoning when not necessarily tied up in formal number representation. You can also extend understanding to help learners to appreciate the importance of biodiversity (bees need flowers at all times of the year) and the importance of bees for pollinating food crops (1 in every 3 mouthfuls of food we eat is from a crop pollinated by bees).

The video is linked to the school curriculum in the following ways:
• Mathematics: By Grade 3 learners should “Count confidently, verbally in ones, tens, fives, twos, twenties, twenty-fives, fifties and hundreds to 1000”. This activity extends beyond that – by asking learners to visualise what the number 10 000 might look like.
• Life Skills: Science: Learning about ‘animals that help us’
• Language extension possibilities. This video also draws on young children’s passion for numbers. As an extension into Languages you can try and get hold of the book: Guess how much I love You which plays with the delight children find in large numbers.
Bireyselleştirilmiş Eğitim Programı: Sınıf ve Rehberlik Öğretmenlerinin Deneyimleri
Authors: ÖZAN Sezgin , SARICA Ayşe Dolunay
Published: September 2020

Bu araştırmada sınıf öğretmenleri ile rehberlik ve psikolojik danışmanlık (RPD) öğretmenlerinin Bireyselleştirilmiş Eğitim Programı (BEP) geliştirme, uygulama, izleme ve değerlendirme süreçlerindeki deneyimlerinin ve süreçte karşılaştıkları güçlüklere ilişkin çözüm önerilerinin belirlenmesi amaçlanmıştır. Araştırmada temel nitel araştırma modeli kullanılmıştır. Araştırmanın katılımcılarını İzmir ilindeki ilkokullarda görev yapan 12 sınıf öğretmeni ile 11 RPD öğretmeni oluşturmuştur. Katılımcıların BEP sürecinde yaşananlara ilişkin görüş ve önerileri, iki katılımcı grupla ikişer olmak üzere toplam dört odak grup görüşmesi gerçekleştirilerek toplanmıştır. Görüşmelerden elde edilen veriler tümevarımsal içerik analizi ile analiz edilmiştir. Sınıf öğretmenleri ve RPD öğretmenlerinden elde edilen bulgulardan yedişer tema oluşturulmuş ve iki grup için oluşturulan temalar arasında yoğun örtüşmeler gözlenmiştir. İki grup katılımcıdan elde edilen bulgular; okul personelinin mesleki gelişim ve yaşam boyu öğrenme olanaklarından yararlanmasının, süreçte yer alan diğerleriyle etkili iletişim ve işbirliği kurmada duyarlı olmasının ve destek hizmetlerin süreçte yer alan tüm paydaşlara sunulmasının kaynaştırma/bütünleştirme ve BEP uygulamalarının nitelikli yürütülmesinde önemli bir rol oynayacağını ortaya koymuştur.
New Analytical Method Development and Validation for Simultaneous Estimation of Sofosbuvir and Velpatasvir in Bulk and Pharmaceutical Dosage Form by RP-HPLC Method
Authors: Hanuman T. , Sivakkumar T. , Sridhar S.
Published: September 2020

A simple, specific and accurate reverse phase high performance liquid chromatographic method was developed for the simultaneous determination Sofosbuvir and Velpatasvirin pharmaceutical dosage form. The column used was Kromosil C18(150mm x 4.6 mm, 5mm)in isocratic mode, with mobile phase containing phosphate buffer andacetonitrile(70:30v/v). The buffer is prepared by adding 1.41gm of sodium dihyrogen ortho phosphate in a 1000ml of volumetric flask add about 900ml of milli-Q water added and degas to sonicate and finally make up the volume with water then pH adjusted to 3.5 with dil. orthophosphoric acid solution. The flow rate was 1.0ml/ min and effluents were monitored at 260 nm. The retention times of Sofosbuvir and Velpatasvirwere found to be 2.404min and 2.986 min, respectively. The linearity for Sofosbuvir and Velpatasvirwere in the range of 40-240µg/ml and 10-60 µg/ml respectively. The recoveries of Sofosbuvir and Velpatasvirwere found to be 99.64% and 99.25%, respectively. The proposed method was validated and successfully applied to the estimation of Sofosbuvir and Velpatasvirin combined tablet dosage forms.

Keywords: Sofosbuvir, Velpatasvir, Validation, Buffer and ICH Guidelines.
In-vitro and in-vivo anti-inflammatory activity of Plumeria indica Linn flowers
Authors: Yadav Narendraa , Jain Sourabh , Shukla Karunakar
Published: September 2020

Inflammation is a reaction of a living vascularised tissue to an injury. Conventional or synthetic drugs used in the treatment of inflammatory diseases are inadequate, it sometimes have serious side effects. So, number of herbal medicines is recommended for the treatment of inflammation that has no side effects. Hence our study focused to investigate the physicochemical, qualitative phytochemical analysis of bioactive compounds and In-vitro and In-vivo anti-inflammatory activity of Plumeria indica Linn (P. Indica) flowers extract which has boundless medicinal properties. The physicochemical evaluations carried out in terms of loss on drying, ash value, extractive values and acid insoluble ash value ect. Qualitative analysis of various phytochemical constituents was determined by the well-known test protocol available in the literature. The aqueous and ethanolic extract of P. Indica flowers was screened for in-vivo anti-inflammatory activity by carrageenan induced paw edema in rat model and in-vitro anti-inflammatory activity by human red blood cell membrane stabilization method. Phytochemical analysis revealed the presence of phenols, flavonoids, tannins, saponins, alkaloids ect. Ethanolic extract showed best in vitro anti-inflammatory activity was screened for in vivo anti-inflammatory activity at the dose level of 250 and 500mg/kg. Indomethacin at the dose level of 10 mg/kg was used as reference standard drug. Both the extracts showed a dose dependent anti-inflammatory potential which provide scientific basis for the traditional claims of P. Indica flowers as an anti-inflammatory drug.

Keywords: Plumeria indica Linn, Anti-inflammatory activity, Carrageenan, Human red blood cells membrane
Psoriasis: An autoimmune disorder
Authors: Tripathi Purnima , Bhardwaj Peeyush
Published: September 2020

Psoriasis is an auto-immune disorder of the skin. It is characterized by the hyperproliferation of keratinocytes.  Severity of the disease depends on the body area affected. Both genetic as well as environmental factors are responsible for it. It affects around 2-3% of world’s population. Psoriasis not only causes physical problems, it also affects mental and social well being of the patient. It may also lead to some Comorbidities like heart problems, diabetes, psychological problems, Crohn’s disease , etc.  Keeping in view the impact it creats in the patient’s life, steps should be taken to create awareness of psoriasis. This article attempts to provide a comprehensive view on the psoriasis. It includes the various forms of psoriasis with their specific features, causes of psoriasis, diagnosis and assessment tools used, treatments available for its management including topical as well as systemic therapy and associated problems.

Keywords: Plaque, Psoriasis, Pustules
Systemic Lupus Erythematosus in Algerian Men: Clinical-Biological and Evolutionary Analysis of 19 Algerian Men
Authors: Belmokhtar Naima Rania , Zemri Khalida , Kanoun Khedoudja , Harir Noria , Bachaoui B.M. , Hebri Sid Tadj
Published: September 2020

Objectives: the aim of our study was to precise the epidemiological, clinicobiological, immunological, and evolutionary profile of systemic lupus erythematosus in Algerian men.

Methods: A retrospective multicenter study was carried out on 19 Algerian male lupus patients, diagnosed according to the ACR and SLICC criteria and followed between 2006 and 2019 on a total of 203 cases of systemic lupus erythematosus in western Algeria.

Results: 203 SLE patients were included, 19 men (9.4%) and 184 women (90.6%) with F/ M sex ratio of 9.68 / 1. The mean age at diagnosis was 33 ± 9.49 years. The most frequent clinical manifestations were joint involvement (84.2%), cutaneous (68.4%) and hematological disorder (63.2%). 15.8% had lupus nephropathies with the predominance of class IV; Raynaud's syndrome and neuropsychiatric involvement were found in 26.3%. Comparison of these results with those of 184 lupus women showed a significant frequency of mucosal ulcer (p=0.000011) and neuropsychiatric damage in men (p=0.011), while alopecia in women (p=0.021). As well, hypocomplementemia (p=0.0004), anti-Sm antibodies (p=0.053) and anti Ribosome (p=0.028) were more frequent in men; while anti-SSA (p=0.003) and anti-SSB (p=0.011) antibodies were more frequent in women. Survival of lupus men was equal to 100% throughout the studied period.

Conclusion: Male lupus is rare. The Algerian man suffers from SLE in a less severe form compared to other data in the literature, which is manifested by a lower frequency of organ damage and mortality.

Keywords: Male lupus, epidemiology, clinical polymorphism, evolutionary profile, western Algeria.
Epidemiological, Clinical, Histological, Serological and Therapeutic Study of Children Celiac Disease in Western Algeria Region
Authors: EL MEHADJI Dounia zad , ZEMRI Khalida , MEHIDA Hayet , HARIR Noria , YEKROU Djamila , NEDJADI Karim Bouziane , LATROCH Charef , OUALI Siheme , BENAISSA Zahira
Published: September 2020

Objectives: To determine the epidemiological, clinical, histological, serological and therapeutic profile of celiac disease in children in Western Algeria region.Methods: 250 patients over a period of three years (2016 - 2019) from the pediatric department of the University Hospital of Oran (West Algeria) were included in our retrospective study.Results: We noticed a female predominance with a sex ratio F/M = 1.57. Symptoms were defined by typical (73.2%) and atypical (26.8%) forms, digestive disorders (47.2%), extra digestive disorders (14.4%). Anemia was noted at 73.6%, and the association with autoimmune diseases at 14.8%. Seropositivity was present in 77.6% of cases and histology revealed partial grade villous atrophy at 54%. We noticed a significant link between the histological grade and the serology (p = 0.001), between age and histological grade (p<10-3), between bone age and body mass index (p = 0.017), between the age of onset of the disease and the age of food diversification (p = 0.030), and with the age of breastfeeding (p = 0.026). In addition, we found an excellent correlation between anti-transglutaminase and anti-endomysium autoantibodies during diagnosis and under diet (p<10-3), and between serology during diagnosis and serology under diet (p = 0.002)Conclusion: Celiac disease (CD) of children in western Algeria is characterized by a variety of clinical symptoms. The gluten-free diet remains the only therapy for these affected children.

Keywords: celiac disease, children, epidemiology, serology, histology, associated diseases, treatment.
Total Phenolic Contents and Antioxidant Properties of Algerian Alkanna tinctoria aerial part Extracts
Authors: Guemmaz Thoraya , Arrar Lekhmici , Baghiani Abderrahmene
Published: September 2020

Objective: Evaluation of the polyphenols, flavonoids and tannins contents of different aqueous extracts of the aerial part of Alkanna tinctoria and their antioxidant activities. 

Methodology: Three extracts;  decoction, macerate and infusion of the aerial part of Alkanna tinctoria were prepared. The content of total polyphenols, flavonoids and tannins of the extracts was carried out and antioxidant activity was assessed using DPPH (2,2’-diphenyl-1-picryl hydrazyl), β-carotene bleaching and iron chelation tests.

Results : The results showed that Infusion (Inf) was the richest in total polyphenols (189.66 ± 30.77 mg EGA / g of dried extract) and flavonoids (26.80 ± 8.37 mg EQ / g of dried extract). While the content of tannins is almost the same for Dec and Inf (40.27 ± 15.00, 40.25 ± 18.27 mg ETA / g of dried extract). Moreover, the two extracts Inf (IC50 of 0.09 ± 0.0015 mg / ml) and Dec (IC50 of 0.17 ± 0. 031 mg / ml) showed a very strong anti-radical activity towards the radical DPPH. In the β-carotene bleaching test, Inf and Dec showed a significant inhibitory activity of peroxidation with values ​​of 100% and 99.8% and are more effective compared to BHT (98.15%). Dec and Mac showed strong chelating activity with IC50s of 0.003 ± 0.0002 mg / ml and 0.005 ± 0.00008 mg / ml respectively. These chelating activities remain higher than EDTA.

Conclusion: It may be concluded that the extracts of the aerial part of Alkanna tinctoria exhibit significant both content of polyphenols and antioxidant activity.

Keywords: Alkanna tinctoria, polyphenols, flavonoids, antioxidant activity.
Chemical investigation, the antibacterial and antifungal activity of different parts of Capparis spinosa extracts
Authors: Benzidane Nadia , Aichour Ridha , Guettaf Sofiane , Laadel Noureddine , Khennouf Seddik , Baghiani Abderrahmane , Arrar Lekhmici
Published: September 2020

Capparis spinosa (Capparidacea), is one of the most used medicinal plants worldwide. It is used for the treatment of various diseases because of its biological and pharmacological effect, such as antioxidant, anticancer, antihypertensive, antidiabetic and antibacterial. Phytochemical analysis of the plant showed that it is a rich source of bioactive constituents, including alkaloids, glucosinolates, tocopherols, carotenoids and polyphenols, which have led to C. spinosa being considered as a promising medicinal plant. Our study aims to detail the chemical profiles of the present bioactive responsible for the pharmacological effects of C. spinosa; it also aims to experimentally demonstrate the presence of polyphenols in different parts of the plant as well as their antimicrobial effects. For this, we used methanolic and aqueous extracts of the different parts of the plant picked in Beni Aziz in the Sétif region (North-east of Algeria). The extracts subjected to TLC and HPLC showed that they were rich in flavonoids and phenolic acids. This led to find that rutin was the most dominant compound in most of our extracts. On the other hand, the antimicrobial effect was tested by the disk diffusion method on three bacterial strains: E. coli, P. aeruginosa and S. aureus and two fungi: C. albicans and A. flavus. Candida albicans’s antifungal effect of our extracts was absent. While the same extracts showed a slight inhibitory activity against Aspergillus flavus. As for the antibacterial effect, it exists only for the methanolic extract of the twigs against Staphylococcus aureus. While the other extracts only showed a slight inhibitory activity against the same strain. The other strains of bacteria were resistant to all extracts at any used concentration.

Keywords: Capparis spinosa, Pharmacological effect, Chemical investigation, antibacterial activity, phenolic compounds, antifungal activity.
Evaluation of Phytocompounds and Chemical Elements Present In Selected Species of Seaweeds, to Sustain Future Quantitative Analysis for Bioactive Compounds
Authors: Dias Valera , Bandeira Salomão , Chaúque Eutilério , Lipassula Maurício , Mussagy Aidate
Published: September 2020

Introduction: The specific physiological capacity of marine organisms, including seaweeds, to survive in extreme environmental conditions is associated to the production of secondary metabolites. Seaweeds are known as powerful source of a broad range of bioactive compounds. Objective: The aim of this study was to investigate the phytocompounds and chemical elements present in eight species of seaweeds which occur around Inhaca Island, Mozambique. Specifically, Halimeda cuneata, Pseudorhizoclonium africanum, Pseudocodium devriesii, Dictyota suhrii, Gracilaria salicornia, Hypnea rosea, Laurencia natalensis and Jania adhaerens. Methods: For phytocompounds and chemical elements screening, seaweeds samples were dried, ground to powder and extracted using methanol as solvent. The analyses were performed using GC-MS analysis, Energy Dispersive X-ray Fluorescence, and colorimetric protocols for phytocompound analysis. Results: A total of 82 phytocompounds were identified. Phytol and Z-8-Methyl-9-tetradecenoic were present in all samples analysed, while Cetene, 9-Octadecenoic acid (Z)-methyl ester, Desmoterol, Octadecanoic acid, and Oleic acid were the less common phytocompound identified. Campesterol, gama-Sitoesterol, Cholest-5-en-ol, 24-propylidene-(3.beta) are phytosterols only identified in green seaweeds. The concentration of chemical elements among the seaweeds species was different. However, Ca, Cl and K were presented in high concentration in some of the seaweeds analysed. Conclusion: Overall, the seaweeds analysed in this study, seems to be good candidate for further biotechnological application and deserve further investigation.

Keywords: seaweeds, methanolic extracts, phytocompounds, minerals, Inhaca Island.
PENGARUH FAKTOR INTERNAL TERHADAP MINAT BERWIRAUSAHA MAHASISWA FAKULTAS EKONOMI DAN BISNIS UNIVERSITAS JAMBI
Authors: Syafitri Winda , Dahmiri Dahmiri
Published: September 2020

The purpose of this research is to explain the effect of Internal Factors toward student interest in entrepreneurship on Economics and Business Faculty of Jambi University. Sampling techniques used on is Non-Probability Sampling with Convenience Sampling Method. The number of respondents is 100 consumers. Technique analysis for this research use descriptive analysis to describe the research variables and multiple regression analysis to find the effect between research variables using SPSS 20.0. This research revealed the significant effect of Internal Factors on Student Interest in entrepreneurship on Economics and business Faculty of Jambi University.
PENGARUH MOTIVASI DAN SIKAP WIRAUSAHA TERHADAP KEPUTUSAN BERWIRAUSAHA WANITA DI KOTA JAMBI
Authors: Setiani Revia , Dahmiri Dahmiri , Indrawijaya Sigit
Published: September 2020

This study aims to analyze the influence of motivation and attitudes of entrepreneurs to the decision of women entrepreneurship in the city of Jambi. The population in this study were women aged 15 years and over with the number 213.096 with 100 respondents. This type of research includes ex post facto research. This research is a correlational descriptive research. Data collection techniques used for primary data obtained from the distribution of questionnaires while for secondary data obtained from various library materials. Analyzer used in this research are, data quality test consist of test of validity and reliability test, multiple linear regression analysis, t test, f test and coefficient of determination test. The overall analysis was calculated using SPSS ver 15 program. The results showed that motivation variable (X1) had a significant effect partially on entrepreneurship decision. As for the entrepreneurial attitude variable (X2) had a significant effect partially on the decision of entrepreneurship. Motivation (X1) and entrepreneurship attitude (X2) had significant effect simultaneously to woman entrepreneurship decision in Jambi city.
ANALISIS KUALITAS PELAYANAN PADA KANTOR KECAMATAN PAUH KABUPATEN SAROLANGUN
Authors: Nasution Arbet Irawan
Published: September 2020

Penelitian ini bertujuan untuk menganalisis Kualitas Pelayanan Pada Kantor Kecamatan Pauh Kabupaten Sarolangun.Metode yang digunakan dalam penelitian ini adalah metode kualitatif melalui pendekatan deskriptif.Kuisioner digunakan untuk mendapatkan informasi pokok pelitian dengan 99 orang responden.Tujuan penelitian ini adalah untuk mengetahui kualitas pelayanan kecamatan pauh terhadap masyarakat dan untuk menganalisis kualitas pelayanan pemerintah kecamatan pauh.Kondisi tanggapan responden dari berberapa pertanyaan tersebut tentunya sudah dapat dijadikan tolak ukur yang obyektif bahwa kualitas pelayanan pada kantor camat pauh sudah baik, hal tersebut dilihat dari berbagai tanggapan responden terhadap pernyataan – pernyataan yang menyatakan bahwa setuju dengan hal tersebut, meskipun masih terdapat kekurangan – kekurang yang perlu untuk di evaluasi sebagai kerangka acuan dalam rangka memperbaiki indikator – indikator pelayanan yang telah diterapkan di kantor kecamatan pauh Kabupaten Sarolangun.Hasil penelitian ini diharapkan dapat dijadikan sebagai bahan pertimbangan dalam membuat kebijakan-kebijakan terutama di kualitas pelayanan Kantor Camat Pauh Kabupaten Sarolangun
Evaluation of Energy Efficiency in Large-Scale Public Lighting. The case of the City of Cuenca, Ecuador.
Authors: Hugo Santiago Arévalo Pesántez  , Leonardo Assaf
Published: September 2020

This paper describes a large-scale energy efficiency assessment of the public lighting system in the city of Cuenca, Ecuador, carried out with the collaboration of the system administrator, the Central South Regional Power Company (CENTROSUR). For the evaluation, the Spanish regulation ITC-EA-02 and the European standard UNE-EN 13201 were used since there are no similar efficiency standards in Ecuador. Three thousand measurement points distributed on about 200 city roads were surveyed. The results allowed to evaluate the levels of average horizontal illuminance on the road and the mean and general uniformities of the arteries as well as the energy efficiency during the years 2014-2015. As a conclusion, and according to the aforementioned European regulation, 81% of the studied roads have excessive levels of illumination; 13% deficient levels and only 6% of the roads complied fully with the standards.
Experimental study of the physicochemical properties of new biofuels
Authors: A. Palomar-Torres  , E. Torres-Jiménez  , R. Bolaños-Jiménez  , G.  Bombek
Published: September 2020

In this work, some physical properties of several biofuels, which are used in compression ignition engines, of which no reference publications have been found, are experimentally obtained. These properties are essential when simulating engine processes such as injection and fuel spray. The measured properties are density and surface tension. Density is measured by the use of a pycnometer and surface tension by means of commercial equipment (Krüss-EasyDyne). Diesel fuel, biodiesel, as well as biodiesel-ethanol blends are tested. Density and surface tension are quantified, verifying that the density is proportional to the concentration of each fuel in the blend. Nevertheless, this is not the case of the surface tension, which fits a second-order polynomial.
Diagnosis of failures in Solar Plants based on Performance monitoring
Authors: Ana P. Talayero  , Andrés Llombart  , Julio J. Melero
Published: September 2020

Photovoltaic (PV) solar energy has become a reference in electrical generation. The plants currently installed, and those planned have a huge capacity and occupy large areas. The increase in size of the plants presents new challenges in operation and maintenance areas, such as the optimization of the number of sensors installed, large data management and the reduction of the timework in maintenance. The aim of this paper is to show a methodology, to diagnose failures, based on the measured data in the plant. The methodology used is supervised regression machine learning and comparison algorithms. This methodology allows the study of the sensors, the inverters, the joint boxes and the power reduction caused by soiling. The result would allow the detection of around 1-5% of production loss in the plant. The algorithms have been tested with real data of PV plants, and have detected common failures such as production drops in strings and losses due to soiling.
Intelligent energy management of Microgrids with flexible demand response
Authors: Vishnu Suresh  , Przemyslaw Janik  , Dominika Kaczorowska
Published: September 2020

This paper deals with the application of a mixed integer distributed ant colony optimization (MIDACO) algorithm as an energy management system for a microgrid represented by real time values and characteristics. The microgrid consisting of numerous sources of renewable energy such as solar photovoltaics, small hydro power plant and battery storage is also able to manage demand response in an intelligent manner so as to reduce the dependency on the utility grid during high peak conditions and also export power to the grid during lower load conditions.
Combining photovoltaic modules and food crops: first agrovoltaic prototype in Belgium
Authors: Brecht Willockx  , Bert Herteleer  , Jan Cappelle
Published: September 2020

Agrovoltaic systems (combination of biomass production and electricity production by photovoltaics (PV)) are typically installed in locations with high insolation and/or arid climates in order to protect the crops against drought and sunburn. However, even in Belgium with a temperate maritime climate, summers are getting warmer and dryer, with reduced crop yields as result. This paper describes the first agrivoltaic prototype in Belgium. By use of a coupled simulation program developed in Python, a checkerboard panel arrangement was selected as an initial validation, in order to have a homogeneous ground radiation and crop growth. Potatoes were grown below the PV modules and the microclimate was measured. Results show lower temperatures below the PV modules and less transpiration and evaporation from crop and soil. The leaf area of the potatoes was larger below the PV modules which indicates an adapted light harvesting capability. Night-time temperatures were not seen to be improved under the agrivoltaic checkerboard structure, which indicates that this arrangement may not provide much protection against frost.
Analysis of public datasets of power quality distortions
Authors: S. Dominguez-Gimeno  , R. Igual  , C. Medrano
Published: September 2020

Automatic classification of power quality distortions has gained interest in research due to the proliferation of distributed power systems with renewable sources. To train and test a classification system, data with power quality distortions are required. Most studies generate synthetic data from mathematical equations, since real distortions are difficult to record. A possible alternative is to use public datasets of real disturbances. However, there are strong differences among public datasets. In this paper, existing datasets of power quality distortions were compiled and their main features were analysed and compared. To the best of our knowledge, this is the first work reviewing these datasets. To identify the datasets, the most cited papers on this topic were surveyed. In addition, systematic searches were conducted in four popular scientific repositories. As a result, four available datasets were identified. They included a limited number of samples (20- 44) and types of distortions. Sampling frequencies and recording conditions were appropriate and the two main fundamental grid frequencies (50 and 60 Hz) were also considered. Although these datasets are appropriate for partially testing automatic classifiers, a remaining research effort is to provide comprehensive datasets with hundreds of samples and several types of distortions.
Potential fuel savings in a combined cycle in Egypt by integrating a parabolic trough solar power plant
Authors: Adham M  , Inés M. Suárez-Ramón
Published: September 2020

Energy is one of the most basic elements of the universe that is essential for all life processes. The problem facing the world nowadays is the diminishing of fossil fuel resources and the increasing of emissions to the atmosphere, thus world attention is now going to the utilizing of renewable energy sources. The aim of this paper is to evaluate the potential fuel savings that could be achieved by integrating a parabolic trough collector solar power plant into an existing natural gas combined cycle in the city of Alexandria, in Egypt, where direct solar radiation levels are high all year, varying from 2,000 kWh/m2 to 3,200 kWh/m2 . The Integrated Solar Combined Cycle (ISCC) has been modelled in Matlab, using Simulink to couple a control system that simulates the operation of the hybrid plant under fuel saving mode. The results show that the tested system achieves good fuel saving, reaching 436,000 $/year in case of controlling the amount of oil that passes in the parabolic collector and 165,625 $/year in case of not controlling the amount of oil with a percentage of 38 % of the first case.
Power Quality of PV Multilevel Inverters in Residential Environment
Authors: M. Buzdugan  , C. Ciugudeanu  , A. Campianu
Published: September 2020

The aim of the paper is to perform a comparative analysis of power quality for several PV multilevel inverters operating in residential environments. Two cases are presented, namely a diode-clamped multilevel inverter and a cascaded H bridge multilevel inverter which are compared with the situation of a pure sinusoidal supply regarding the voltage, the current and the instantaneous power waveform shapes. The waveforms are synthesized and uploaded in a programmable power source and are applied to a 40 W / 459 lx LED luminaire load. The harmonic limits check according to the standard IEC 61000-3- 2:2018, Class C, regarding lighting equipment are also presented. The measurements revealed that a filter retrofitting method was needed in order to obtain compliance with the power quality standard requirements
Decentralized current sharing in dc microgrids considering normal and disturbed operation modes
Authors: A. Kirakosyan  , E. F. El-Saadany  , M. Shawky El Moursi  , M. Salama
Published: September 2020

The accurate ratio-based current sharing, which is one of the desired features of the droop controlled dc microgrid, might be affected by the system impedance. Several strategies have been presented in the literature to achieve precise current sharing. This paper proposes a new controller reconfiguration algorithm that is capable to achieve enhanced operation during normal conditions and after system disturbances. For this purpose, the proposed algorithm allows the converter to follow the set-points determined by a higher-level controller when there is no disturbance in the system. After a system disturbance, when the necessity for the current sharing arises, the proposed controller enables accurate ratio based current mismatch sharing between the droop controlled converters. The time-domain simulation conducted in Matlab/ Simulink environment demonstrates the effectiveness of the proposed approach.
Comparative analysis of numerical models of plate-fin heat sinks with forced convection for thermoelectric energy generation
Authors: A. Martinez-Marin  , I.R. Cózar  , T. Pujol  , N. Luo  , L. Pacheco  , J.R. Gonzalez  , A. Massaguer  , E. Massaguer  , E. Massaguer  , Shazly A. Mohamed
Published: September 2020

Plate-fin heat sinks under forced convection are economical dissipaters employed in a wide variety of sectors. These types of heat sinks are commonly used in power generation by means of commercial thermoelectric generator modules. The design of the heat sink is a key factor in these power generation systems since it greatly affects the efficiency of the direct conversion from heat into electrical energy. Here, we analyse several numerical models of plate-fin heat sinks under forced convection with and without air flow bypass. The predictions of both hydraulic and thermal parts of these models are compared with our own experimental data. Results reveal that Lindstedt and Karvinen model (2012) is the more accurate one, with discrepancies with respect to measurements below 12% for most of the cases studied.
Wind generation in weak systems
Authors: L. Rouco  , J. L. Zamora  , A. García-Cerrada
Published: September 2020

Control systems of wind generators are usually designed neglecting the effect of the external grid (the impedance of the grid is much smaller than the impedance of the step-up transformers). Wind generator manufacturers are facing considerable challenges when connecting their machines to weak systems. A number of issues may arise. This paper classifies them and proposes a common approach to address them.
VISUAL STRATEGIES OF CONTEMPORARY ART: A Case Study of Banksy’s Artworks
Authors: Wicaksono Singgih Prio
Published: September 2020

Visual Strategy of Contemporary Art: The Study of Banksy’s Artwork. The development of contemporary art has introduced a new understanding and recognition of esthetics. This article aims to describe postesthetic phenomena as trends in the visual communication of contemporary art. The method used is a descriptive approach and analysis of Banksy's work. This study produces a discussion about: 1). Postesthetic symptoms in Banksy's work, 2). Characteristics of Banksy's work, 3). Banksy's symbolic meaning, 3). Social implications arising from the postesthetic approach to Banksy's work. Keywords: visual language, consumerism, contemporary art
Volatilitas Kurs dan Saham Mengikuti Model EGARCH(1,1) Berdistribusi Versi Skew Normal dan Student-t
Authors: Nugroho Didit Budi , Kusumawati Anggita M , Sasongko Leopoldus R
Published: September 2020

Studi ini membandingkan kinerja pencocokan model volatilitas GARCH(1,1) dan EGARCH(1,1) pada return kurs dan saham. Model mengasumsikan empat distribusi berbeda untuk error dari return: Normal, Skew-Normal (SN), Alpha-Skew Normal (ASN), dan Student-t. Data aset keuangan yang digunakan sebagai analisis perbandingan yaitu data kurs beli US Dollar (USD) dalam periode harian dari Januari 2010 sampai Desember 2017 dan data indeks saham FTSE100 dalam periode harian dari Januari 2000 sampai Desember 2013. Studi ini membandingkan metode Generalized Reduced Gradient (GRG) Non-Linier di Solver Excel dan metode Adaptive Random Walk Metropolis (ARWM) untuk mengestimasi model. Hasil menunjukkan bahwa metode GRG Non Linear Solver Excel memberikan estimasi yang serupa dengan metode ARWM dan tidak melanggar kendala model. Lebih lanjut, berdasarkan nilai Akaike Information Criterion (AIC), kedua data pengamatan menyediakan bukti bahwa model dengan distribusi Student-t adalah yang terbaik, diikuti oleh distribusi SN yang lebih baik daripada model dengan distribusi ASN dan Normal. Nilai AIC telah menyarankan model EGARCH(1,1) berdistribusi Student-t sebagai model pencocokan terbaik untuk kedua data pengamatan.
Strategi Guru Mengenalkan Konsep Dasar Literasi di PAUD Sebagai Persiapan Masuk SD/MI
Authors: Fahmi Fahmi , Syabrina Muhammad , Sulistyowati Sulistyowati , Saudah Saudah
Published: September 2020

Strategi guru merupakan unsur penting dalam proses pembelajaran. Mengenalkan konsep dasar literasi kepada anak usia dini sebagai bekal memasuki jenjang pendidikan selanjutnya, selain itu, anak juga dituntut paham tentang konsep literasi. Tujuan penelitian ini untuk mengetahui strategi guru untuk mengenalkan konsep dasar literasi di PAUD sebagai persiapan memasuki SD/MI, untuk mengetahui faktor yang mempengaruhi penggunaan strategi dalam mengenalkan konsep dasar literasi di PAUD. Penelitian ini menggunakan metode kualitatif dengan pendekatan deskriptif, adapun tehnik pengumpulan data menggunakan observasi, wawancara dan dokumentasi, analisis data menggunakan trianggulasi tehnik dan trianggulasi sumber. Hasil Penelitian menunjukan bahwa guru menggunakan beberapa strategi untuk mengenalkan konsep dasar literasi diantaranya strategi belajar langsung atau melalui bermain, melibatkan anak dalam kegiatan pembelajaran, bermain peran, bercerita, atau mendongeng. adapun faktor yang mempengaruhui guru untuk menggunakan staregi dalam mengenalkan konsep dasar literasi ialah karateristik peserta didik yang berbeda, kemampuan anak masih rendah, tuntutan orang tua dan adanya prasyarat untuk masuk SD/MI.
Making Internal Feedback Explicit: Harnessing the comparisons students make during two-stage exams
Authors: Nicol David , Selvaretnam Geethanjali
Published: September 2020

In two-stage exams, students produce some academic work individually then do the same work again in small groups. Both works contribute to the individual grade. Prior research shows that students perceive that the feedback dialogue they engage in, during two-stage exams, aids their learning. Also, outcome studies show that this method benefits individual student learning. However, there is no research on the internal feedback students generate during two-stage exams, when they compare their own individual performance against the group discussion and the developing group output. To investigate this, internal feedback was made explicit, in a two-stage exam, by having students write a feedback commentary on their own learning at both the individual and group stages. Analysis showed that students not only generated content and process feedback but also self-regulatory feedback, and that this feedback was of a higher quality than and went beyond that which the teacher provided. The implications for future implementations of two stage exams are considered as well as how this research adds to the literature on internal feedback.
Psychometric Properties of School Refusal Assessment Scale-Revised: Parent Version in Iranian Population
Authors:   Department of Psychology, Faculty of Literature and Humanities, Urmia University, Urmia, Iran., Ebrahimzadeh Khoshdavi , Ghadiri Sourman Abadi Farhad ,   Department of Psychology, Faculty of Literature and Humanities, Urmia University, Urmia, Iran., Anvari Anbi Soraya ,   Department of Psychology, Faculty of Humanities, Azad University of Urmia, Urmia, Iran., Abdolmohamadi Karim ,   Department of Psychology, Faculty of Psychology and Education, Allameh Tabataba’i University, Tehran, Iran.
Published: September 2020

Objective: This study aimed at evaluating the factor validity of the Kearny school refusal assessment scale-revised: parent version among parents of school students in Urmia City, Iran. Methods: The study population comprised students in the first, second, and third grades of elementary schools in Urmia (N=18750). Of them, 351 students from 5 schools were selected using a multistage cluster sampling method. Then, They responded to the Kearny school refusal assessment scale-revised: parent version. To assess the construct validity of this scale, confirmatory factor analysis and internal consistency were used.  Results: The goodness of fit index of the confirmatory factor analysis model indicated a relatively good fit of the data with factor structure of the school refusal assessment scale-revised and confirming the existence of four characters of school stimulus, evaluative situations, seeking caregivers’ attention, and tangible reinforcements, as school refusal characters. Also, the Cronbach alpha coefficient values indicate the stability of the measurement of the whole scale as well as its subscales. Conclusion: Based on these results, the school refusal scale has good statistic characters and the 4-factor mentioned model has good construct validity and help clinicians to determine the symptoms and causes of school refusal behavior.
Źródła do dziejów bibliotek w zbiorach Seminarium Duchownego w Sandomierzu
Authors: Warda Kazimierz
Published: September 2020

Na wstępie Autor artykułu przedstawia ruch zbieractwa książek w XIX w.zrodzony po utracie przez Polskę niepodległości. Zwraca dalej uwagę, że podstawę wielu księgozbiorów prywatnych powstałych w tym okresie stanowiły książki pochodzące z bibliotek klasztornych. Naturalnie, księgozbiory zakonne zasiliły także inne polskie biblioteki instytucjonalne: świeckie i duchowne. Przedstawiając w skrócie dzieje bibliotek zakonnychw XVIII-XIX w., zwraca uwagę na los księgozbiorów skasowanych klasztoróww Królestwie Polskim. Część (fragmenty) tych kolekcji trafiła do Biblioteki Seminarium Duchownego w Sandomierzu (w 1819, 1864-1866, 1893), która dzięki temu stała się ważnym źródłem do dziejów bibliotek klasztornych z Kielecczyzny. Dowodzą tego zarówno zachowane w tej Bibliotece spisy (w tym inwentarze) książek pochodzących z bibliotek zakonnych, jak i badania proweniencyjne samego Autora, który zidentyfikował książki ze zbiorów m.in.: pijarów, bernardynów, franciszkanów, benedyktynek, dominikanów, paulinów, kanoników regularnych. Zbiory Biblioteki Seminaryjnej stanowią również ważne źródło do dziejów innych bibliotek instytucjonalnych (szkolnych) oraz księgozbiorów prywatnych, zwłaszcza osób duchownych.
Does Structural Power Matter? Board Attributes and Firm Performance
Authors: Korir Fiona Jepkosgei , Tenai Joel K
Published: September 2020

Purpose- The study investigates the moderating role of Chief Executive Officer Duality onboard attributes and firm performance of companies listed in Kenya.
Design/Methodology- The research used a longitudinal research design. Panel data were derived from published accounts for sixteen years that is from 2002-2017. IGLS regression models were used to test the hypothesis.
Findings- The empirical results indicated that the independence of the board, the size of the board, and the duration in which the board member served the organization positively influence the firm performance. However, CEO duality does not moderate the relationship.
Practical Implications- Regulatory bodies such as NSE and CMA in Kenya should ensure that listed firms have more independent directors serving a board, ensure a reasonable size of the board and increase the board tenure to enhance firm performance. Further, the combined roles of the CEO and chairman may not influence the efficiency of the board in the Kenyan context.
Effects of storage temperature and duration on pollen grain viability and pollen-tube elongation in Chinese chinqapin (Castanea henryi Skan)
Authors: Xiong Huan , Yuan Deyi , Deng Zhi-Yu , Niu Genhua , Zou Feng
Published: September 2020

Chinese chinquapin [Castanea henryi (Skan) Rehder & E.H. Wilson] is used as a food and timber crop in southern China. Most chinquapin cultivars are self-incompatible and bloom at different times; consequently, artificial pollination is used to ensure fruit set and nut yield. Effective pollen storage that enables producers and breeders to use stored pollen for cross-pollination at a later date is important. In this study, the cultivar Changmangzi was used to estimate the viability and pollen tube length of pollen stored at room temperature, and at 4, −20, and −80°C using in vitro germination tests. It was observed that pollen grain germination significantly decreased at all four storage temperatures. Pollen viability was 14.4% after only 24 days of storage at room temperature. The germination rate was 13.3% after 90 days of storage at 4°C, and 14.5% after 180 days at −20°C. The initial germination rate of pollen stored at −80°C was 56.3% at the beginning of the test and decreased to 15.4% after 240 days. Pollen-tube length decreased with increased storage duration; mean pollen-tube lengths ranged from 109.44 to 257.51 μm. Based on these results, it is suggested that a storage temperature of −80°C for Changmangzi pollen is good.
Genetic diversity in pearl millet restorers based on seed vigour traits and SSR markers
Authors: Tanwar Hemender , Yashveer Shikha , Sangwan Vijay Pal , Sharma Sushma , Sangwan Sonali , Mor Virender Singh
Published: September 2020

Thirty four pearl millet restorer lines were evaluated on the basis of nine seed vigour traits and molecular analysis was done with 55 SSRs to study the genetic divergence among them. Cluster analysis based on seed vigour parameters revealed the considerable amount of variability and all genotypes were divided into six clusters. Furthermore, a set of 39 SSRs, selected after initial screening of 55, amplified 226 alleles with a mean of 5.84 alleles per locus. The highest polymorphic information content (PIC) value obtained was for PSMP 2084 (0.88) with a range of 0 to 0.88 and average PIC of 0.558. Neighbor joining tree based on molecular data differentiated all the genotypes into two major groups. The grouping based on both approaches can help breeders to use the studied material in further breeding for improvement of germination potential and early seedling vigour of pearl millet.
Tarkastelussa kasvatuksen ja koulutuksen sosiaalinen oikeudenmukaisuus ja tasa-arvo
Authors: Brunila Kristiina
Published: September 2020

Muun muassa syrjäytymisvaarassa oleviin liittyvää tutkimusta vahvistetaan kasvatustieteissä. Helsingin yliopiston kasvatuksen ja koulutuksen sosiaalisen oikeudenmukaisuuden ja tasa-arvon professuuri on Suomessa ensimmäinen laatuaan.
Akateeminen kapitalismi ja kollektiivisuuksien paradoksaalisuudet tohtorikoulutuksessa
Authors: Guttorm Hanna , Arvola-Orlander Auli , Niemi Anna-Maija , Vaahtera Elina , Mertanen Katariina , Tammi Tuure , Mononen-Batista Costa Sari , Brunila Kristiina , Kouhia Anna , Paakkari Antti , Kainulainen Ville , Ikävalko Elina
Published: September 2020

Hakkarainen, Hytönen, Makkonen & Lehtonen ehdottivat Aikuiskasvatuksessa 4/2013 ”luonnontieteellisen”, niin sanotun kollektiivisen mallin soveltamista kasvatustieteellisessä jatkokoulutuksessa. Kirjoittajakollektiivi jatkaa keskustelua akateemisen kapitalismin uhasta.
Problematika Pendidikan Agama Islam pada Anak dalam Keluarga Perkawinan Beda Agama di Caturtunggal Depok Sleman Yogyakarta
Authors: Yusuf Muhammad , Susilawati Ani , Maba Aprezo Pardodi
Published: September 2020

This research is motivated by the reality of religious education for children in interfaith marriages. Where many problems are faced by parents in directing children's religious education. In order to make a focus discussion, the authors directed the study to an Islamic education. This study aims to obtain a detailed description of Islamic religious education for children in families with interfaith marriages at the Caturtunggal Depok, Sleman, Yogyakarta, as well as to discover their problems when applied Islamic education to their child. There are two stages of this study, the data collection and the data analysis. The data collection stage uses the method of observation, interviews, and documentation. While the data analysis uses a taxonomic method, an analysis carried out to explore more deeply Islamic education for children in families of interfaith marriages. The results of the study indicate that the problem in the application of Islamic education to children are parents too busy, limited religious knowledge, and parents did not make agreements on their children's religion. While the problems faced by children are confusion, inferiority, and apathy. In addition, there are positive aspects that can be taken from interfaith marriages, namely children have a basic knowledge of comparative religion and children become more tolerant in viewing religious differences.