bluuebunny/crossref_metadata_2025 huggingface dataset:
Den transnationale uddannelsesrevolutions opløsning af pædagogikkens egenart
Authors: Pio Frederik
Published: June 2020

Artiklen perspektiverer på den almene pædagogiks aktuelle, pressede tilstand, i lyset af de centrale, transnationale udviklingstendenser inden for uddannelsesstyring der har gjort sig gældende de sidste ca. 25-30 år. Dette gøres, ved at tage afsæt i de såkaldte antinomier, som en række pædagogiske forskere har forholdt sig til som definerende for moderne pædagogik. Denne tematik blevet sat på dagsordenen af aktuelle uddannelsesforskere som bl.a. Alexander von Oettingen; Michael Uljens; Lars Løvlie; Gert Biesta, Birgit Schaffar og Dietrich Benner. Oettingen ser nærmere bestemt spørgsmålet om pædagogisk professionalitet som spaltet i fire antinomiske paradokser, der angår (i) Rationalisering (sociologi); (ii) Pluralisering (kultur); (iii) Individualisering (psykologi) og (iv) Civilisering (natur, filosofi) (Oettingen i Kristensen & Laursen: 2012, s. 531-549). Disse pædagogiske paradoksaliteter har en rod bl.a. hos Kant, Rousseau og Herbart. Artiklen søger gennem fokusering af sådanne pædagogiske antinomier eller paradokser (omkring pædagogikkens videns-, værdi-, institutions- samt handlings-problem, jf. Oettingen: 2010) at vise, hvorledes den transnationale uddannelsesrevolution de sidste 25-30 år har udtyndet den almenpædagogiske undermuring af begreberne: I. professionalitet, II. læring, III. autenticitet og IV. dannelse. Dermed fokuseres de almenpædagogiske problemstillinger der kendetegner disse fire begreber. Dette gøres for at vise, hvorledes den transnationale uddannelsesstyring i dette lys udgør en bekymrende afvikling eller sammenklapning af pædagogikkens almene grundtræk.
La formación de investigadores con tecnologías digitales: una revisión sistemáticade la literatura especializada
Authors: Palacios-Díaz Rosalba , Escudero-Nahón Alexandro
Published: June 2020

La educación superior es uno de los tipos de educación más influidos por las tecnologías digitales. Esta situación, al tiempo que presenta varias ventajas, también impone muchos desafíos. La educación de tipo superior en México se conforma por tres niveles: técnico superior, licenciatura y posgrado. En los estudios de posgrado es donde se forman, propiamente, los investigadores en ciernes. No obstante, no existe abundante literatura especializada sobre los desafíos que impone las tecnologías digitales para formar a los investigadores en, relativamente, poco tiempo (de uno a cuatro años). Este estudio documental aplicó el método de investigación llamado Revisión Sistemática para identificar los hallazgos más relevantes que los especialistas han analizado sobre el uso de las tecnologías digitales por parte de los investigadores en formación. La Revisión Sistemática se realizó en cuatro fases: búsqueda documental en bases de datos científicos, descripción de los criterios de inclusión y exclusión de textos, análisis y categorización y, finalmente, discusión y propuesta. Los resultados más relevantes sugieren que los investigadores en formación lidian con varios problemas al momento de usar tecnología digital, entre los que destacan: la preparación incorrecta de los espacios de trabajo para la producción de conocimiento; la necesidad de generar articulaciones espontáneas entre las herramientas digitales disponibles, vigentes e interoperables; y la configuración adecuada de las redes de investigación, entre otros. Finalmente, se propone un proceso de uso de las tecnologías digitales que recorre, de forma itinerante, tres etapas durante la formación del investigador: preparación, uso y distribución.
The Knowledge Domain of The Baltic Journal of Road and Bridge Engineering Between 2006 and 2019
Authors: Zhou Wei , Xu Zeshui , Zavadskas Edmundas Kazimieras , Laurinavičius Alfredas
Published: June 2020

The Baltic Journal of Road and Bridge Engineering is a multidisciplinary journal, which provides a forum for a broad range of road and bridge engineering research. The topics such as the road and bridge research and design, the construction materials and technologies of roads and bridges, the construction financing and environmental issues, and the assessment management are included in the scope of the Baltic Journal of Road and Bridge Engineering investigation. Due to the reason that various road and bridge engineering related research directions are involved in this journal, it has become the first one that deals with the issues as mentioned above in Baltic countries. Therefore, it is believed that investigating the publications in the Baltic Journal of Road and Bridge Engineering assists researchers in great learning the development of road and bridge engineering research in Baltic countries. By analysing the annual publication distribution, the citation structure, the co-citation and cooperation networks, and the significant contributors in terms of countries and regions, institutions, cited journals and authors, the status of Baltic Journal of Road and Bridge Engineering is comprehensively presented. In addition, the emerging trends are revealed through the analyses of timeline view and burst detection. This study makes the contribution to the aspect of visualizing the complex and significant results based on objective and quantitative data. It provides readers with access to understand the development of Baltic Journal of Road and Bridge Engineering and helps researchers learn the hot issues in this journal clearly and directly.
Taxation of the income of arbitration administrator in form of expenses reimbursed in the bankruptcy procedure: problems of theory and practice
Authors: Kiryanova Nadezda Nikolaevna
Published: June 2020

This article examines the problem of taxation of the income of arbitration administrator in form of expenses reimbursed in the bankruptcy procedure. The author analyzes the problem of outlining the definition of income in tax law, considering the established law enforcement practice on the topic, as well theoretical approaches towards definition of this concept. The need is substantiated for legislative consolidation of the term of economic profit for the purpose of adherence to the principle of certainty of taxation of the incomes of private entities and formation of the universal law enforcement practice in settlement of tax disputes. In the course of this research, the author used a number of formal-logical methods: analysis, synthesis, induction and deduction. Based on the conducted study, it is suggested to form a position at the legislative level, according to which the expenses reimbursed by arbitration administrator in the of bankruptcy procedure are not defined as income according to the norms of tax legislation. The article describes the possibility for optimization of tax administration, related to computation and discharge of taxes by arbitration administrators as the subjects of professional activity.
Absence of Posttraumatic Bone Marrow Edema in the Setting of Preeclampsia
Authors: Shiang Tina , Tai Ryan , Watts George J.
Published: June 2020

Magnetic resonance imaging is a powerful tool in the diagnosis of missed or occult fractures on radiographic and computed tomographic (CT) imaging, through the detection of bone marrow edema. Although radiologists often rely on bone marrow edema as a guide for diagnosing subtle underlying fractures, it is important to recognize its limitations as a diagnostic metric. We present a rare case demonstrating the absence of bone marrow edema after acute trauma and confirmed Lisfranc fracture in a patient with preeclampsia and propose an interesting physiologic mechanism to explain this manifestation.
The Mobile Workshop
Authors: Mavhunga Clapperton Chakanetsa
Published: June 2020

The tsetse fly is a pan-African insect that bites an infective forest animal and ingests blood filled with invisible parasites, which it carries and transmits into cattle and people as it bites them, leading to n'gana (animal trypanosomiasis) and sleeping sickness. This book examines how the presence of the tsetse fly turned the forests of Zimbabwe and southern Africa into an open laboratory where African knowledge formed the basis of colonial tsetse control policies. The book traces the pestiferous work that an indefatigable, mobile insect does through its movements, and the work done by humans to control it. The book restores the central role not just of African labor but of African intellect in the production of knowledge about the tsetse fly. It describes how European colonizers built on and beyond this knowledge toward destructive and toxic methods, including cutting down entire forests, forced “prophylactic” resettlement, massive destruction of wild animals, and extensive spraying of organochlorine pesticides. Throughout, the book uses African terms to describe the African experience, taking vernacular concepts as starting points in writing a narrative of ruzivo (knowledge) rather than viewing Africa through foreign keywords.
Library Services for Open Education
Authors: Løkse Mariann , Lund Øystein , Aspaas Per Pippin
Published: June 2020

Mariann Løkse, head of Library Services, and Øystein Lund, head of the Resource Center for Teaching, Learning and Techology at UiT The Arctic University of Norway discuss library support for open education. They share their thoughts on online education in general and during a period of COVID-19 lockdown in particular. They talk us through information literacy, MOOCs, learning outcomes from online courses as compared to traditional classroom lectures, and a range of other aspects of open education.

During the discussion, the following web services and online documents are mentioned: iKomp (a MOOC on information literacy, in Norwegian and English); https://www.sevuppt.no/ (a MOOC on pedagogical supervision, in Norwegian); https://doi.org/10.7557/15.5501 (Mariann Løkse's contribution to a collection of articles dedicated to Stein Høydalsvik on his retirement, in Norwegian); https://hdl.handle.net/10037/3823 (the doctoral thesis of Øystein Lund, in Norwegian).

First published online June 25, 2020.
Improving EFL Learners’ Oral Production through Reasoning-gap Tasks Enhanced with Critical Thinking Standards: Developing and Implementing a Critical TBLT Model, Pre-Task Plan, and Speaking Rubric
Authors: Yaprak Zeynep , Kaya Fatma
Published: June 2020

This study aims to design and implement a speaking task model following the principles of Task-Based Language Teaching (TBLT) and Critical Thinking (CT). The study mainly investigated to what extent the use of critical thinking standards had an impact on the students’ oral performance with respect to the linguistic trilogy of fluency, accuracy, and complexity. Experimental research design was conducted to examine the differences in research foci between the non-treatment and treatment groups. Data were drawn from 16 students of the English Language Teaching department and collected through the designed task rubric, speech samples, and semi-structured interview protocols. The findings indicated that adherence to relevant intellectual standards in reasoning-gap tasks had a positive effect on the oral performance of the speakers of the target language. Additionally, concerning two linguistic dimensions of accuracy (p=.00) and complexity (p=.00), MANOVA results showed a statistically significant difference between two main research groups. Based on the semi-structured interview findings, all participants in the treatment group reported positive views regarding their learning experiences and oral performance supported with critically enhanced reasoning-gap tasks. This study proposes language teachers a synthesized TBLT model enhanced with critical thinking standards. With this task model, suggested pre-task plan, and speaking rubric, they can boost their students’ intellectual agility and make them more intellectually and linguistically active in their oral performance.
A Survey into the Cultural Background of Emerson’s Educational Thought
Authors: Yang Jing , Yiyi Yang
Published: June 2020

As an avid advocator of education reform in the 1850s, Emerson was long neglected in the history of American educational thought. This paper, through the investigation from four aspects, namely the Transcendental Educational Thought, the Puritanical Educational Thought, the Romantic Educational Thought, and the Confucian’s Educational Thought, attempts to figure out the cultural background of Emerson’s education thought, tries to work out the connections between his ideas and his contemporaries, such as Thoreau, Fuller, and Alcott, and points out the significant role it plays in the history of American education thought up to day.
The Level and Sources of Foreign Language Speaking Anxiety among Saudi EFL University Students
Authors: Alnahidh Faye , Altalhab Sultan
Published: June 2020

This study aims to investigate the level and the sources of Foreign Language Speaking Anxiety (FLSA). To achieve this aim, a mixed-method approach was used by implementing a questionnaire and interviews. Eighty-five female Saudi EFL university students completed the questionnaire. Six of the most highly anxious students were identified according to the questionnaire results and interviewed. The findings revealed that the participants experienced a moderate level of FLSA in their English class. In addition, there are several sources of FLSA, which can be listed in the following order: fear of making mistakes, forced participation, lack of vocabulary, lack of practice, lack of grammar. Participants also reported other sources of anxiety such as fear of making pronunciation mistakes, the negative attitude of teachers and the need to give oral presentations. Based on the results, the study reached a conclusion and constructed a set of recommendations.
Urban tissue transformation under the densification policy
Authors: Zurovac Gordana
Published: June 2020

Based on the case of Oslo, this paper focuses on the physical results of the implementation of the densification policy in Norway. By applying the urban morphological approach, the paper examines transformation of urban tissue at the intermediate spatial scale (buildings – plot – street – urban block). It covers 71 cases of multi-family residential buildings and analyses the pre-existing tissues where they occur as well as the principles of intervention. The results reveal a myriad of tissue types (mixed tissues being dominant) and a significant number of entirely new urban blocks. Tissues are investigated in terms of conditions and challenges, and new blocks are analysed for their morphological characteristics and application in densification.
A high proportion of red snapper sold in North Carolina is mislabeled
Authors: Spencer Erin T. , Richards Emilie , Steinwand Blaire , Clemons Juliette , Dahringer Jessica , Desai Priya , Fisher Morgan , Fussell Sloane , Gorman Olivia , Jones Diamond , Le Amanda , Long Kayla , McMahan Cammie , Moscarito Caitlin , Pelay Catherine , Price Erica , Smith Anna , VanSant Allison , Bruno John F.
Published: June 2020

Seafood mislabeling occurs when a market label is inaccurate, primarily in terms of species identity, but also regarding weight, geographic origin, or other characteristics. This widespread problem allows cheaper or illegally-caught species to be marketed as species desirable to consumers. Previous studies have identified red snapper (Lutjanus campechanus) as one of the most frequently mislabeled seafood species in the United States. To quantify how common mislabeling of red snapper is across North Carolina, the Seafood Forensics class at the University of North Carolina at Chapel Hill used DNA barcoding to analyze samples sold as “red snapper” from restaurants, seafood markets, and grocery stores purchased in ten counties. Of 43 samples successfully sequenced and identified, 90.7% were mislabeled. Only one grocery store chain (of four chains tested) accurately labeled red snapper. The mislabeling rate for restaurants and seafood markets was 100%. Vermilion snapper (Rhomboplites aurorubens) and tilapia (Oreochromis aureus and O. niloticus) were the species most frequently substituted for red snapper (13 of 39 mislabeled samples for both taxa, or 26 of 39 mislabeled total). This study builds on previous mislabeling research by collecting samples of a specific species in a confined geographic region, allowing local vendors and policy makers to better understand the scope of red snapper mislabeling in North Carolina. This methodology is also a model for other academic institutions to engage undergraduate researchers in mislabeling data collection, sample processing, and analysis.
Searching for a signature involving 10 genes to predict the survival of patients with acute myelocytic leukemia through a combined multi-omics analysis
Authors: Zhuang Haifeng , Chen Yu , Sheng Xianfu , Hong Lili , Gao Ruilan , Zhuang Xiaofen
Published: June 2020

Background

Currently, acute myelocytic leukemia (AML) still has a poor prognosis. As a result, gene markers for predicting AML prognosis must be identified through systemic analysis of multi-omics data.

Methods

First of all, the copy number variation (CNV), mutation, RNA-Seq, and single nucleotide polymorphism (SNP) data, as well as those clinical follow-up data, were obtained based on The Cancer Genome Atlas (TCGA) database. Thereafter, all samples (n = 229) were randomized as test set and training set, respectively. Of them, the training set was used to screen for genes related to prognosis, and genes with mutation, SNP or CNV. Then, shrinkage estimate was used for feature selection of all the as-screened genes, to select those stable biomarkers. Eventually, a prognosis model related to those genes was established, and validated within the GEO verification (n = 124 and 72) and test set (n = 127). Moreover, it was compared with the AML prognosis prediction model reported in literature.

Results

Altogether 832 genes related to prognosis, 23 related to copy amplification, 774 associated with copy deletion, and 189 with significant genomic variations were acquired in this study. Later, genes with genomic variations and those related to prognosis were integrated to obtain 38 candidate genes; eventually, a shrinkage estimate was adopted to obtain 10 feature genes (including FAT2, CAMK2A, TCERG1, GDF9, PTGIS, DOC2B, DNTTIP1, PREX1, CRISPLD1 and C22orf42). Further, a signature was established using these 10 genes based on Cox regression analysis, and it served as an independent factor to predict AML prognosis. More importantly, it was able to stratify those external verification, test and training set samples with regard to the risk (P < 0.01). Compared with the prognosis prediction model reported in literature, the model established in this study was advantageous in terms of the prediction performance.

Conclusion

The signature based on 10 genes had been established in this study, which is promising to be used to be a new marker for predicting AML prognosis.
MAPEAMENTO DA ESCRITURA EM LÍNGUA PORTUGUESA COMO L2 DE SURDOS BRASILEIROS CANDIDATOS AO CURSO DE LICENCIATURA EM LETRAS EM LÍNGUA BRASILEIRA DE SINAIS
Authors: Pedrosa Cleide Emília Faye
Published: June 2020

Como professora de Linguística do curso de Licenciatura em Letras Libras (Língua Brasileira de Sinais), tive a experiência de participar da elaboração e correção das provas de interpretação em LP (Língua Portuguesa) e das redações em LP nos vestibulares de 2015-2017, na Universidade Federal de Sergipe, no Brasil. Tal experiência motivou o desenvolvimento de projetos de pesquisa, entre eles: “Estudos das identidades e processos de escritura em língua portuguesa como L2: comunidade surda em pauta”, com um plano de iniciação científica que focava na análise de redações de vestibular de Surdos. Diante dessa experiência, o objetivo deste estudo é mapear as estratégias linguístico-discursivas desenvolvidas por Surdos através de suas escrituras em língua portuguesa como L2. Como caminhos metodológicos na linha qualitativa-interpretativista, selecionamos uma representação de redação dos anos 2014-2017 da Universidade Federal de Sergipe. Os estudos são orientados pela análise linguística e discursiva, com forte influência da leitura social da Análise Crítica do Discurso (ACD) (FAIRCLOUGH, 2008; BESSA, 2016, PEDROSA, 2016) em complementaridade com os Estudos Surdos, sob a visão educacional e linguística. Como resultado tem-se que os textos e o mapeamento de suas materialidades funcionam como pistas que nos conduzem a refletir acerca de como ocorrem e ocorreram as práticas discursivas e sociais na educação de surdos e na construção de sua(s) identidade(s), especialmente a linguística, como um povo que é obrigado a ser bilíngue em sua própria terra por imposição majoritária dos ouvintes.
«ГОРЯЧИЕ ЮПИТЕРЫ»: ОРБИТАЛЬНАЯ ЭВОЛЮЦИЯ, ВОЛНЫ В ЗВЕЗДАХ И ПРИЛИВЫ, "Земля и Вселенная"
Authors: ИВАНОВ Павел Борисович
Published: June 2020

В этой заметке обсуждаются самые интересные, с точки зрения автора, особенности систем, содержащих так называемые «горячие юпитеры» - планеты-гиганты, расположенные вне Солнечной системы и имеющие орбитальные периоды порядка нескольких дней. Особенное внимание уделено недавно обнаруженному в некоторых таких системах эффекту медленного уменьшения орбитального периода, а также приливным взаимодействиям, которые, вероятно, его вызывают. Обсуждается современное состояние теории так называемых «динамических приливов», в развитии которой автор принимал непосредственное участие, и ее способность объяснить данные наблюдений.
ЗОНЫ ОБИТАЕМОСТИ. ОТ СОЛНЕЧНОЙ СИСТЕМЫ К ЭКЗОПЛАНЕТАМ, "Земля и Вселенная"
Authors: АНАНЬЕВА Владислава Игоревна , ТАВРОВ Александр Викторович , КОРАБЛЁВ Олег Игоревич
Published: June 2020

Поиск внеземной жизни, особенно разумной - сложная междисциплинарная проблема на стыке астрономии, биологии, социологии и теории информации. Поскольку до сих пор зарождение жизни до конца еще не понято и не воспроизведено в лаборатории, остается неясной доля случайности в этом процессе. Возможно, жизнь зарождается всегда в подходящих для этого условиях, и тогда задача молекулярной биологии - предсказать эти условия. Однако не исключено, что самозарождение жизни - крайне маловероятное событие, счастливая случайность, произошедшая только раз на древней Земле. Поэтому поиск внеземной жизни имеет и огромное мировоззренческое значение, помогая определить место Человека во Вселенной. Не касаясь проблем, находящихся в компетенции биологии, очертим круг задач, стоящих в поисках внеземной жизни перед астрономией. Прежде всего - это поиск потенциально обитаемых планет, то есть планет, подходящих для жизни в той форме, которая нам известна, и оценка их распространенности.
ПОЛУЧЕНИЕ Mycobacterium tuberculosis ПОСЛЕ ФАГОЦИТОЗА НЕЙТРОФИЛАМИ IN VIVO ДЛЯ ГЕНЕТИЧЕСКОГО И ФУНКЦИОНАЛЬНОГО АНАЛИЗА, "Вестник Центрального научно-исследовательского института туберкулеза"
Authors: Майоров Константин Борисович , Григоров Артем Сергеевич , Кондратьева Елена Валерьевна , Ажикина Татьяна Леодоровна , Апт Александр Соломонович
Published: June 2020

Нами разработан новый метод выделения ex vivo нейтрофилов с высоким содержанием фагоцитированных Mycobacterium tuberculosis. Метод, основанный на фракционировании перитонеального экссудата в ступенчатом градиенте плотности перколла, позволяет получать чистую популяцию микобактерий, которые подверглись фагоцитозу в течение 2 часов взаимодействия с нейтрофилами in vivo. Получены первые данные об изменении геномного профиля транскрипции таких бактерий методами RNA-seq по сравнению с культивируемыми в среде Дюбо. Результаты указывают на исключительно быстрый переход в состояние приспособления к стрессовым условиям внутри фагоцитов хозяина за счет повышения экспрессии генов, регулирующих реакции клеточного дыхания, и снижения экспрессии генов для факторов вирулентности.
A Statistically Driven Spectral Method for Deriving Reservoir Properties Using 3D Seismic Data and Well Log Suites
Authors: B. Olaseni V. , S. Onifade Y. , O. Airen J. , Adeoti L.
Published: June 2020

A statistically driven spectral method was carried out on 3D seismic data and well logs in ‘’VIC’’ Field within the Niger Delta with the aim of deriving reservoir properties and delineating stratigraphic features using edge detection attributes like coherence so as to have a better and clearer view of subsurface structure of a reservoir interval that possesses hydrocarbon using Spectral method.

A suite of data consisting of seismic sections and composite logs comprising Gamma-ray, Resistivity, Spontaneous Potential, Sonic Time and Porosity logs (density and Neutron) were utilized to identify reservoir interval on log signature across wells 4 and 5 and the reservoir interval obtained was between 11,164 feet and 11,196 feet. Edge detection attribute like coherence was computed from the amplitude data in time domain and transformed to frequency domain using Fourier Transform tool in MATLAB. In order to display well log in time, well to seismic tie was carried out using check shot data which was used as time to depth relationship.

The analysis of the spectral domain shows distinct bright spots that vary with measured depth due to variation in fluid and formation properties. The results led to an enhancement of seismic data interpretation in the field of study due to a spectral technique method that was applied to calculate the frequency slices. The results indicate that the spectral domain in coherence attributes revealed better geological features and the reservoir character such as faults and fractures.

Frequency domain gives better geological maps as it is used to filter data, which means it is an enhancement of hidden features in time domain and gives a smoother variation of the features that has low frequency values. A reservoir with low frequency values is a sandy environment showing stratigraphy features. Hence, the reservoir is suspected to be a channel fill reservoir. This implies that Spectral domain (frequency) defines major geological areas of the ‘’VIC’’ field and gives much clearer image of the reservoir features within the field than in time domain.
Measurement of Magnetic Field Intensity within Captain Elechi Amadi Polytechnic Rumuola, Rivers State, Nigeria
Authors: A. Sokari S. , N. Orlunta A.
Published: June 2020

The measurement of magnetic field intensity within Captain Elechi Amadi Polytechnic, Rumuola was carried out with the aid of a handheld Bentech (GM-3120) Model Electromagnetic Radiation Metre. A total of 6 sampled locations were recorded; randomly with six distinct measurement and their coordinates at each of the sampled location with the aid of the global system position satellite (GPS) device. The measurement took place between 2017 November to 2018 March. A minimum value of 0.3417 0.65 T was recorded at the Administrative Block and a maximum value of 1.9767 1.43 T at the Business Centre. The overall mean values of all the sampled locations all fall below the recommended limit for the outdoor magnetic field intensity exposure of 100T of the International Commission of Non-Ionizing Radiation Protection (ICNIRP). The outcome of the measurement reveals that the exposure to magnetic field intensity to staffs, students and commercial workers within the campus of the Captain Elechi Amadi Polytechnic poses no health hazard.
Exact Solutions of the Generalized KP-BBM Equation by the G′ / G-expansion Method and the First Integral Method
Authors: Cheng Huaji , Hu Yanxia
Published: June 2020

In this paper, the generalized KP-BBM equation is considered. The G′ / G-expansion method and the first integral method are applied to integrate the equation. By means of the two methods, the rational solutions, the periodic solutions and the hyperbolic function solutions are thus obtained under some parametric conditions.
Electronic Behaviour of Schottky Diodes Fabricated from Electroplated CdSe Semiconductors
Authors: I. Olusola O. , Ewetumo T. , A. Obagade T. , D. Adedayo K.
Published: June 2020

The fabrication of Schottky diodes using electroplated n- type CdSe thin films and gold metal contact have been successfully achieved. The electronic properties of the fabricated diodes with the device structure glass/FTO/n-CdSe/Au have been investigated by current-voltage (I-V) and capacitance-voltage (CV) measurement techniques. The I-V characteristics revealed a good rectifying behaviour with an ideality factor of 1.50, a potential barrier height (ϕb) >0.79 eV and rectification factor (RF) surpassing 102 at 1.0 V. Results from the C-V measurement showed that the fabricated Schottky diodes have doping density of ~1.61 × 1017 cm-3 and a built-in potential (Vbi) of 0.24 V which falls in the range of reported Vbi values for Schottky diodes. Both I-V and C-V parameters revealed that the CdSe Schottky diodes possess qualities for excellent performance in electronics circuit or as an electronic device.
Evaluate the Radioactivity in Drinking Water from Kakuri, Kaduna
Authors: O. Adeeko Tajudeen , E. Adeeko Lilian
Published: June 2020

Small traces of radioactivity are normally found in all drinking water. The concentration and composition of these radioactive constituents vary from place to place, depending principally on the radiochemical composition of the soil and rock strata through which the raw water may have passed. The aims of this work were to analyze and determine the gross concentration of alpha and beta radiation in drinking water. Ten water samples from hand-dug (HD) well (5) and borehole (BH) (5) were selected applied stratified random sampling technique from kakuri. Results of the measurements reveal that gross alpha and beta activity were presence in all the water samples investigated; the gross alpha activities range between 0.014±0.006Bq/l to 0.072±0.022Bq/l, with average of 0.037±0.014Bq/l, and gross beta activities range between 0.200±0.041Bq/l to 1.530±0.140Bq/l, with average of 0.6132±0.104Bq/l. The hand-dug well and borehole were not radioactively contaminated, the obtained values were all below the World Health Organization (WHO) and International Organization on Standardization (ISO) drinking water guideline values of 1.0Bq/l for gross beta radioactivity and 0.5Bq/l for gross alpha radioactivity per year. Hence, groundwater from the area is radioactivity safe to use, it posed no threat to the health of people around the area when consumed, besides transformer borehole (BH08) sample which exhibit high beta activity, therefore; borehole (BH08) sample is not drinkable because it’s not safe of radioactivity.
Gamma Spectrometry Analysis of Natural Radionuclide Contents of Three Mushroom Species Commonly Grown in Benue State, Nigeria
Authors: A. Nathan A. , Sombo T. , V. Gurgur B. , A. Avaa A. , A. Fadeyi T.
Published: June 2020

The activity concentration and Annual Effective doses of 40K, 226Ra, and 232Th in some edible mushroom species (Cantharellus cibarius, Agaricus campestris, Termitomyces robustus) found in three Local Government Areas of Benue state-Nigeria were determined using Gamma Spectrometry; the 1460KeV gamma-radiation of 40K was used to determine the concentration of 40K, gamma transition energy of 1764.5KeV 214Bi was used to determine the concentration of 226R, while the gamma transition energy of 2614KeV 208TI was used to determine the concentration of 232Th. The activity concentration due to 226Ra, 232Th and 40K in the samples ranged from 10.06±1.6 - 14.19±3.01Bqkg-1; 10.88±2.65 to 15.38±4.30Bqkg-1and 202.31±1.4 to 318.44±3.20Bqkg-1 respectively; the highest activity due to 226Ra was found in Termitomyces robustus grown in Gboko; that due to 232Th was recorded in Agaricus campestris grown in Buruku L.G.A., while the highest activity concentration due to 40K was recorded in Termitomyces robustus found in Buruku. Generally, 40K recorded the highest activity concentration in each mushroom species examined. Annual Effective Dose from these species sampled ranges from 0.0006952mSvy-1 (in Makurdi- Termitomyces robustus species) - 0.0008467mSvy-1 (in Buruku Termitomyces robustus species). The average effective dose value of 0.00788±0.000186mSvy-1 obtained in this work is below the maximum permissible level established by ICRP (1996). Thus, these mushrooms species will not pose any apparent risk to human health.
Transient MHD Natural Convective Flow Past a Heated Vertical Non-porous Surface with Thermal Radiation and Double-Diffusion Effects
Authors: I. A. Okuyade W. , Okor Tega
Published: June 2020

The problem of transient MHD natural convective flow past a vertical plate with thermal radiation, cross-diffusion and zero suction effects is investigated. The governing one-dimensional spatial and non-linear partial differential equations of the Boussineq form are non-dimensionalized to, among others, bring out the necessary parameters. The evolving dimensionless equations are transformed into ordinary differential equations using the similarity transformation, and linearized using the regular perturbation expansion series solutions. The linearization leads to the zeroth and first order equations, and are solved semi-analytically using the Mathematica 11.0 computational software. Expressions for the temperature, concentration, velocity, Nusselt number, Sherwood number and Skin friction are obtained, computed and presented graphically. The analysis of results, amidst others, shows that the increase in the Dufour number increases the temperature, but decreases the Nusselt number; the increase in the Soret number decreases the concentration, but increases the Sherwood number; the increase in the Prandtl number decreases the temperature and concentration, but increases the Nusselt number and Sherwood number; the increase in the Hartmann number decreases the velocity and skin friction. These results are benchmarked with the existing reports in literatures, and are in good agreement.
Boron-doped TiO2 (B-TiO2) Thin Films Grown Using Sol-Gel Spin Coating Method
Authors: O. Samson D. , D. A. Buba A.
Published: June 2020

In this study, the effect of modifying boron doping concentration on the optical properties, electrical properties and microstructural images of TiO2 thin films was investigated by the sol-gel technique by grinding TiO2 powder with a boron compound at a wavelength range of 250 nm to 850 nm. The SEM micro-images revealed the homogenous, continuous and nanocrystalline surface morphology: 10% is the tolerable amount of boron doping concentration into the TiO2 for achieving sphere-like nanostructures materials with low agglomeration. The XRD spectra of the B-TiO2 films showed anatase peaks of greater intensities when compared to the pure TiO2 film. All the films illustrate extinction coefficient in the visible region of solar spectra corresponding to the low absorption, and absorption peaks established in the ultraviolet region near 330nm with the optical transmittance varied from over 52 - 96% in the UV-Vis wavelength range. Diffuse reflectance absorption spectra analysis indicated that the incorporation of B into TiO2 material results in a substantial red shift and the absorption extends significantly into the visible range. The optical band gap energy values of the thin films were found to be 3.38, 3.35, 3.28, 3.26, and 3.36eV. This showed a low probability of raising the electron across the mobility gap with the photon energy in the visible region. The refractive index values varied between 1.891 and 1.922 depending on the percentage content of boron. Moreover, the imaginary part of the dielectric constant increase slowly, whereas the real part increases sharply and the optical conductivity was found to increase with the increase in boron addition.
The Effect of Eriochrome Black T Concentrations on the Efficiency of Dye-sensitized Solar Cells
Authors: Ali Ahmed Moutasim , Dirar M. , A. Siddig Mohamed , M. H. Abdalsakhi S.
Published: June 2020

Aims: To investigate The effect of concentration on organic solar cell efficiency.

Study Design:  Polymer and natural dye Eriochrome black T were deposited on ITO glass substrate, and then the resulted cells were tested for  characteristics.

Place and Duration of Study: International University of Africa Faculty of Pure and applied science-Department of Physics collaboration with University Medical Science and Technology- Alawia Centre and  AlNilain University – Faculty of Science and Technology – Department of Physics, between March 2016 and May 2017.

Methodology: we have dye of different colour, we select three colours the dye, and then UV-visible spectrometer used for absorption spectra. After that, the relation between absorption and wavelength, absorption coefficient, and energy band gap were found graphically. Finally, cells were designed on ITO glass substrate by using spin coating deposition. Characteristics measured.  

Results: The relation between the Eriochrome black T concentration of dye for three samples are 6.67, 6.03, and 5.43 g/L, and the corresponding efficiencies for dark blue are 0.091, 0.090 and 0.229 respectively. The efficiencies of yellow Eriochrome Black T are 0.228, 0.193 and 0.181. And the efficiencies of red Eriochrome Black T are 0.246, 0.235 and 0.193. The decreases of efficiency due to the decreases of Eriochrome Black T concentration is related to the direct relation between Eriochrome Black T concentration and solar cell.

Conclusion: The efficiency of dye-sensitised solar cells can be increased by increasing the Eriochrome Black T dye concentrations at least within the examined range. The Eriochrome Black T dye type also affect efficiency. This includes the transparency of the Eriochrome Black T dye beside the value of the Fermi energy. In addition to the relative positions of highest occupied molecular orbitals (HOMO) and lowest unoccupied molecular orbits (LUMO) to nearby layers.
Radioactivity Concentrations in Soil Samples from Kandam, Gyalgyal, Burmawan masaka, Dinbisu and Giyawa Mines in Wurno LGA, Sokoto State, Nigeria
Authors: M. Ahijjo Y. , N. Baba-Kutigi A. , Momoh M. , M. Bayawa A. , Hussain M.
Published: June 2020

Aims: This study was conducted in a bid to ascertain the concentration of NORMS in the soil samples dugout of some mining sites in Kandam, Gyalggal, Burmawan masaka, Dinbisu and Giyawa town in Wurno LGA, Sokoto State Nigeria. The concerns about NORMS radioactivity in the environment are frequently linked to natural radioactivity which is more of primordial radionuclides.

Study Design: A total number of nine soil samples were randomly collected for this study. The randomness was in order to represent over 90% of the sample population of different mines in Wurno LGA, Sokoto state for the analysis of gamma-ray spectrometry of High Purity Germanium (HPGe) detector coupled to a Multi-Channel Analyzer (MCA).

Place and Duration of Study: Department of Physics, Usmanu Danfodiyo University, Sokoto, Nigeria, between August 2015 and June 2016.

Methodology: The concentrations of the radionuclides (226Ra, 232Th and 40K) were ascertained through a high-resolution gamma-ray spectrometry of HPGe detector coupled with a Multi-Channel Analyzer, Centre for Advanced Studies in Physics (CASP), Government College University (GCU), Lahore, Pakistan. The activity concentrations of 226Ra, 232Th and 40K in the soil samples were obtained and used to calculate the radiological parameters ( Raeq, Hex, Hin, DAbs and Deff ) in order to assess the radiological impacts on the inhabitants.

Results: The mean activity concentrations for 226Ra, 232Th and 40K in the soil samples were found to be 58.34, 53.76 and 679.70 Bqkg-1 while the radiological hazards parameters revealed mean values of 187.55 Bqkg-1, 0.51, 0.66, 87.77 nGy.h-1 and 107.64 μScyr -1 for Raeq, Hex, Hin, DAbs  and Deff respectively. These were compared with the results of similar studies conducted elsewhere and around the world. It was noticed that 40K contributes the highest level of radioactivity in this study which could enhance the amount of background radiation received by the population in the study area. The activity concentration unveiled from the soil samples were considerably lower for 226Ra and 232Th when compared to the activity of 40K. The mean value of the doseused to calculate the radiological parameters calculations shows that an elevated exposure to radioactivity by the inhabitants around this mine is eminent. 

Conclusion: Cancer and various forms of ailment due to radioactivity exposure are further anticipated for the workers in the pits and the dwelling communities.
Shock Wave Interactions with Viscosity Observed after the Coronal Mass Ejection Activities Occurred on December 18, 1999 and April 4, 2001
Authors: Cavus Huseyin , Ibrahim Karafistan Aysel
Published: June 2020

The release of magnetic field and plasma from the solar atmosphere (i.e. coronal mass ejections-CMEs and solar wind) resulting from solar magnetic activity can produce shock waves and geomagnetic storms. Shock waves are known to occur while the solar ejected particles alter from the supersonic to the subsonic regime. Especially, in the supersonic case for the flow of compressible gas interaction of shock waves with viscosity plays a key role for space weather broadcasts. Therefore, the major objective of this paper was to search the outcome of viscosity in the shocks subsequently detected after the CMEs occurred on December 18, 1999 and April 4, 2001 by using the previous modelling study of [1].
Entropic Uncertainty Relations, Entanglement and Quantum Gravity Effects via the Generalised Uncertainty Principle
Authors: Gadea Otto , Blado Gardo
Published: June 2020

We apply the generalised uncertainty principle (GUP) to the entropic uncertainty relation conditions on quantum entanglement. In particular, we study the GUP corrections to the Shannon entropic uncertainty condition for entanglement. We combine previous work on the Shannon entropy entanglement criterion for bipartite systems and the GUP corrections to the Shannon entropy for a single system to calculate the GUP correction for an entangled bipartite system. As in an earlier paper of the second author, which dealt with variance relations, it is shown that there is an increase in the upper bound for the entanglement condition upon the application of the generalised uncertainty principle. Necessary fundamental concepts of the generalised uncertainty principle, entanglement and the entropic uncertainty relations are also discussed. This paper puts together the concepts of entanglement, entropic uncertainty relations and the generalised uncertainty principle all of which have been separately discussed in pedagogical papers by Schroeder, Majernik et al., Blado et al. and Sprenger.
Calculating Energy Levels in 25Mg/25Al Mirror Nuclei
Authors: Noraldini Ali , Bagheri Mahla , Mohammadi Saeed
Published: June 2020

Coulomb Displacement Energies in mirror nuclei 25Mg, 25Al have been calculated using shell model code OXBASH [1] and compared with experimental results. The code calculations were done in the USD model space with the W Hamiltonian [2]. The OXBASH code which is based on famous nuclear model, the shell model, deals with evaluating energy levels in nuclei. A comparison had been made between our results and the available experimental data [3] to test theoretical shell model description of nuclear structure in mirror nuclei. The energy states of mirror nuclei are almost identical, except for the small effects due to Coulomb interaction where the symmetry in being broken.  Energy spectrum calculated with this code was in good agreement with the published experimental data [3].
Diffuse Reflectance of Powders
Authors: Radjenović Dimitrije , Stojičić Biljana , Radjenović Branislav , Radmilović-Radjenović Marija
Published: June 2020

The propagation of light through powders differs significantly from the propagation of light in a homogeneous material, since the light scatters off points in its path. Colors of powders are related to the fineness of the powder, when the powder is illuminated with white light. As Fourier transform infrared has become more common, the diffuse reflection method has become widely used. Diffuse reflectance is an excellent sampling tool for powdered materials.
Theoretical Verification of the Formula of Charge Function in Time of Capacitor (q = c*v) for Few Cases of Excitation Voltage
Authors: Das Shantanu
Published: June 2020

We have a developed and derived a formula for capacitor i.e. charge as a function of time, which is convolution operation of time varying capacity function and time-varying voltage function. This is different to the usual and conventional way of writing capacitance multiplied by voltage to get charge stored in a capacitor. This new deliberation with convolution operation works well for classical capacitors (i.e. ideal loss less capacitors), that is of a constant capacity at all frequencies, and also for a time varying capacity function given by decaying power-law: that gives the formation of a fractional capacitor. In this paper, we use this developed new charge storage expression and apply to various types of inputs excitation voltage-sinusoidal, step, ramp voltage and then analyze and interpret the results for charge stored, the current expressions, the loss-tangent and the memory effects. With this new formulation, we also evaluate impedance function of a classical capacitor as well as a fractional capacitor, and also elaborate on the Nyquist’s diagram, that is employed to study various dielectric materials via impedance spectroscopy. This new approach of charge storage concept is yet to be practically as well as theoretically applied-though some initial work has started. This paper gives a theoretical validity test i.e. analytically obtained in several applications for this new formulation, of charge storage formula. This paper will be useful in various super-capacitor studies, dielectric relaxation experiments, and impedance spectroscopy for various material developments for electrical energy storage missions; however, this concept is yet to be used to its full potential.
Geoelectrical Investigation of Subsurface Structures for Mapping Groundwater Potential of Joseph Ayo Babalola University Campus Environment, Ikeji Arakeji, Osun State, Southwestern Nigeria
Authors: Odeyemi O. E. , Odeyemi O. M. , Owolabi S. A. , Mamukuyomi E. A. , Salako R. A.
Published: June 2020

Owing to fast increase in number of staff and students of Joseph Ayo Babalola University, Ikeji Arakeji, Southwestern Nigeria, it is therefore very important to carry out this research in order to recommend the actual locations where boreholes can be sunk for good potential yields of groundwater when the time comes. The aim of this research is to carry out vertical electrical sounding geophysical survey at study area with a view to determining good aquifers that are good for the accumulation of groundwater. The study area is located between latitude 0820225 m to 0820345 m (UTM) Northings and longitude 717320 m to 717450 m (UTM) Eastings. Schlumberger electrode array was employed for the study using Ohmega Resistivity meter for the data acquisition. The geoelectric survey of the study area comprised of twelve vertical electrical soundings, with maximum current electrode spacing (AB) of 100 m. The modeled curves are mainly KH-type. The geoelectric sections generated from the sounding curves revealed 4 major layers earth models. The topsoil is made up of clay, clayey sand/lateritic sand with resistivity and thicknesses varying from 54.7 – 210.1ohm-m and 0.2 –0.8m respectively. The second layer is the lateritic clay with resistivities and thicknesses varying from 334 – 963ohm-m and 1.5 – 10.8m respectively. The third layer constitutes the clay / sandy fractured quartzite and it serves as the aquifer unit. The resistivity values lie between 71.7 and 498 ohm-m while the thicknesses vary from 2.1 – 76.3 m. The fourth layer is the fractured/presumably fresh basement bedrock with the resistivity varying from 1879 – 13991.8 ohm-m. Areas characterized with fractured basement of low resistivity with appreciable thickness are therefore recommended for the siting of boreholes. It is concluded that the vertical electrical sounding points of the study area are good aquifers for groundwater accumulation.