bluuebunny/crossref_metadata_2025 huggingface dataset:
Peran Guru dalam Pembelajaran Home visit di Masa Pandemi Covid-19 pada Siswa Sekolah Dasar
Authors: Jamaah Jamaah
Published: October 2021

Penelitian ini merupakan penelitian kualitatif dengan pendekatan fenomenologi dan sumber data diperoleh dari data primer dan data sekunder yang berkaitan dengan pelaksanaan pembelajaran home visit di SD Negeri 25 Woja. Instrumen dalam penelitian ini berupa pedoman observasi, pedoman wawancara dan pedoman dokumentasi. Teknik pengumpulan data diperoleh dari observasi, wawancara, dan dokumentasi. Teknik analisis data berupa pengumpulan data, reduksi data, penyajian data, dan penarikan kesimpulan dan verifikasi. Pengecekan keabsahan temuan di peroleh dari triangulasi sumber dan triangulasi teknik. Hasil penelitian menunjukkan bahwa SD Negeri 25 Woja melaksanakan pembelajaran tatap muka berdasarkan Surat Edaran Bupati Dompu: Nomor 420/3495.UM/Dikbud tanggal 22 Juli 2020 tentang penyelenggaraan pembelajaran tatap muka pada zona hijau dan kuning di masa pandemi Covid-19 (kondisi khusus). Adapun pada pengimplementasian home visit terdapat tiga tahapan yaitu: a) tahap persiapan, b) tahap pelaksanaan, dibagi menjadi 2 yaitu: tahap pelaksanaan kegiatan awal dan kegiatan lanjutan, c) tahap monitoring dan evaluasi pembelajaran, Penelitian ini dapat disimpulkan bahwa: 1) pembelajaran home visit ini dilakukan berdasarkan instruksi Surat Edaran Bupati Dompu: Nomor 420/3495.UM/Dikbud tanggal 22 Juli 2020 tentang penyelenggaraan pembelajaran tatap muka pada zona hijau dan kuning di masa pandemi Covid-19 (kondisi khusus). 2) pelaksanaan home visit terdapat tiga tahap yaitu: a) tahap persiapan b) tahap pelaksanaan terbagi menjai dua yaitu: tahap pelaksanaan kegiatan awal dan tahap pelaksanaan kegiatan lanjutan. c) tahap monitoring dan evaluasi pembelajaran
Peran Orang tua dalam Membimbing Anak Usia Sekolah Dasar di Rumah pada Masa Pandemi Covid-19
Authors: Nurhasanah Enung
Published: October 2021

Permasalahan yang diangkat dalam penelitian ini adalah bagaimana  peran orang tua dalam membimbing anak usia sekolah dasar di rumah pada masa pandemi covid-19 di Desa Kareke Kecamatan Dompu Kabupaten Dompu. Penelitian ini mengunakan penelitian kualitatif dengan pendekatan fenomenologi. Pengumpulan data di lapangan mengunakan teknik observasi, wawancara,dan dokumentasi.Yang menjadi subjek penelitian ini terdiri dari kedua orang tua yang memiliki anak usia 6-12 tahun sebanyak 6 keluarga ,anak berjumlah 7 orang dan juga seorang guru yang bertempat tinggal di dusun Raba Desa Kareke Kecamatan Dompu Kabupaten Dompu.Penentuan subjek mengunakan purposive sampling, Analisis data digunakan secara deskriptif.Hasil penelitian ini menunjukan bahwa Peran orang tua dalam membimbing anak usia sekolah dasar di rumah pada masa pandemi covid-19 di Desa Kareke Kecamatan Dompu Kabupaten Dompu adalah telah dilaksanakan walau kurang maksimal seperti di sekolah.Semua dikarenakan banyak dari orang tua anak yang sibuk dengan pekerjaanya dan juga kurangnya pemahaman orangtua terhadap materi pembelajaran anak.Tetapi orang tua tetap  memiliki rasa peduli pada pendidikan anak. Rata-rata baik dari narasumber yang lulusan SMA atau pasca sarjana, melakukan bimbingan di malam hari dengan pembelajaran sesuai kemampuan orangtua.Orang tua biasa membimbing maupun memotivasi anak dengan cara berbeda-beda. Terkadang ada yang memberi iming-iming hadiah, memberikan pujian, nasehat maupun ada yang memberikan hukuman, agar anak mau belajar selama berada di rumah.
PENGARUH TEKNOLOGI PENGELASAN PT. CAPUTRA MITRA SEJATI SHIPYARD TERHADAP KUALITAS PEMBANGUNAN KAPAL PATROLI CEPAT (PC) 40
Authors: Susanto Adhi , Hendarto S Ferdy , Syamrahmadi Priyonggo
Published: October 2021

This study was aimed to recognize the effect of welding technology, welder expertise and welding equipment maintenance on the quality of the construction of a Fast Patrol Boat (PC) 40. This study was a quantitative descriptive study with 45 respondents as data sources. The data analysis technique in this study was processed with the SPSS version 25 program. The results showed that there were positive and significant effects of welding technology on the conatruction quality of the Fast Patrol Boat (PC) 40, positive and significant effects of welder expertise on the construction quality of Fast Patrol Boat Development. (PC) 40, positive and significant effects of welding equipment maintenance on the construction quality of the Fast Patrol Boat (PC) 40
English Language Anxiety of Tertiary Level Learners in Bangladesh: Level and Sources
Authors: Al Mamun Abdullah
Published: October 2021

The prime objectives of this study were to unveil the level of anxiety and the sources of English language anxiety of the tertiary level students of Bangladesh. Through a questionnaire survey using Foreign Language Classroom Anxiety Scale developed by Horwitz et al. (1986), the study found that most of the tertiary level learners have high anxiety of English as a foreign language. Based on an exploratory factor analysis with principal component analysis and varimax rotation (Kaiser Normalization), a four-factor (communication anxiety, comprehension and test anxiety, fear of negative evaluation, and lack of anxiety) solution emerged. Following a close analysis of the EFA and other established valid models, the study found that six components, namely, speaking anxiety, fear of negative evaluation, peer pressure/social-image anxiety, comprehension-related anxiety, negative attitude towards class, and test anxiety were the main sources of anxiety, which need to be addressed for alleviating the anxiety of the students.
Who Are You Without Your Substance? Transforming Occupational Time Use in Recovery
Authors: Jarrard Paula , Cunningham Sadie , Granda Paxton , Harker Paige , Lannan Taylor , Price Kristine
Published: October 2021

Medically underserved rural communities struggle to meet challenging needs in response to the opioid crisis. The purpose of this study was to measure any benefit of an occupational therapy (OT) intervention group with participants in an addiction recovery program. Supervised OT graduate students implemented a five-week program at a faith-based non-profit organization in a small metro community. A weekly time management occupational-based intervention group based on the Action Over Inertia (AOI) manualized protocol focuses on motivating and providing strategies to successfully reintegrate individuals into the community by using meaningful activity and positively influencing levels of occupational balance and engagement (Krupa et al., 2003). Outcome measures included self-report of time use, occupational balance, occupational engagement, and goal identification, satisfaction, and performance. The need to effectively treat individuals with SUD is a public health priority. Results demonstrated positive outcomes with self-rating of time management, self-management skills, frequency of engaging in meaningful activities, and performance and satisfaction in meeting individual goals. This research adds to the limited evidence base in the OT literature for interdisciplinary treatment of this population using a manualized occupation-based intervention. 
Digitalisierung im Gesundheitswesen: Akzeptanz von Wearables und Krankenversicherungs-Apps
Authors: Klein Andreas , Nihalani Katrin
Published: October 2021

Mit Wearables können die eigene Gesundheit überwacht und sportliche Aktivitäten auf individueller Ebene begleitet werden. Krankenversicherungs-Apps ermöglichen den unkomplizierten Kontakt mit dem Versicherer sowie die Implementierung von Anreizsystemen in die Vertragsgestaltung. Die Studie verdeutlicht, dass eine stärkere Digitalisierung von Gesundheitsleistungen helfen kann, sowohl das deutsche Gesundheitssystem effizienter zu gestalten als auch die Zufriedenheit der Nachfrager zu verbessern. Zudem ist der Datenschutz zwar bedeutsam, die eigene Gesundheit bei einem Abwägungsprozess zwischen Gesundheit und Datenschutz aber ebenfalls wichtig. Die Verantwortlichen aus Politik und Selbstverwaltung sollten hieran bei der Gestaltung geeigneter Rahmenbedingungen ansetzen.
Eine ethische Beurteilung der Einschränkung der Freizügigkeit im Rahmen des Asylverfahrens in Deutschland auf Basis der Gerechtigkeitsansprüche von John Rawls
Authors: Wolf Nadja
Published: October 2021

The restriction of freedom of movement within the German asylum procedure is legally controversial. My essay applies John Rawls’ Theory of Justice to this problem. This is appropriate because Rawls makes the principle of equal basic freedoms the central aspect of a just order and thus addresses the core aspect of the selective restriction of freedom of movement. However, this is also a challenge to show to what extent a theory Rawls wrote for a closed society can be applied to current issues that arise when these boundaries between inside and outside dissolve through migration.
Wohnen 6.0 – Mehr Eigenverantwortung in der (institutionellen) Langzeitpflege wagen!
Authors: Kremer-Preiß Ursula
Published: October 2021

Die Heimversorgung ist in der Krise. Viele Stellschrauben hat man in den vergangenen Jahren bewegt, um den Funktionsstörungen zu begegnen. Aber diese sind systembedingt und es bedarf einer strukturellen Neuausrichtung. Das Kuratorium Deutsche Altershilfe (KDA) hat in den vergangenen Jahren mit seiner 1.-5. Heimgeneration immer wieder Vorschläge zur Weiterentwicklung der Heimversorgung gemacht. Mit Wohnen 6.0 will das KDA die Diskussion zur Weiterentwicklung der Heimversorgung erneut anregen. Wohnen 6.0 zielt auf eine Demokratisierung der Sorgeleistungen. Heime sollen nicht nur Mitglieder einer Caring Community im umgebenden Sozialraum sein, sondern intern die Werthaltung der Sorgenden Gemeinschaft aufgreifen. Eine solche Demokratisierung der Sorgeleistung kann für alle ein Gewinn sein.
The Diffusion of Morality Policies
Authors: Cruz-Aceves Victor-David
Published: October 2021

Through event history analysis and seemingly unrelated estimations, this study investigates the way in which diffusion of state-level legislation in the USA changes according to the varying degrees of morality policy characteristics it displays. The author finds that the magnitude of diffusion increases when policies reflect fewer characteristics of morality policy. Moreover, policies with high moral content diffuse when preceded by a bounded-learning process, information about which is heavily drawn from polities with similar moral attributes; learning about legislation with moderate and minimal characteristics of morality policy not only occurs selectively, but information is also retrieved from ideologically dissimilar polities, too.
Kartellrechtliche Zulässigkeit von Superligen im Fußball
Authors: Cukurov Dennis
Published: October 2021

The creation of a European football super league is becoming more and more likely. Some top clubs want to introduce such a league without involving the UEFA. The UEFA wants to prevent this in order to keep its tournaments free of competition. This conflict of interest is an example of the more general tension between competition law and sport. The author examines not only UEFA’s prevention measures, but also possible cooperation between the clubs. Among other things, he addresses two topics that have been insufficiently discussed so far, the concept of legitimate objective within the meaning of the so-called Meca-Medina test and the competitive balance before and after the creation of a super league, and argues for the implementation of a “more Europe” approach in European football.
Comunità e Sentimento di Amicizia nell’Etica Kantiana
Authors: Savi Marina ,   Philosophy Documentation Center
Published: October 2021

A partir de Hegel, a filosofia moral kantiana foi interpretada em sentido solipsístico. Uma reconsideração abrangente da ética pondo em articulação um dos núcleos d a Fundamentação da metafísica dos costumes, a saber, o conceito de “reino dos fins” com a secção da Metafísica dos costumes dedicada aos “De veres de virtude em relação aos outros”, permitiu-nos reconstruir o pensamento kantiano sobre as relações interpessoais. Do confronto da noção de “reino dos fins” com as reflexões sobre a amizade emerge um modelo de relações morais fundado sobre a reciprocidade. A amizade anima as relações de troca entre os membros do “reino dos fins”, personalizando-a. Numa relação entre amigos que possua uma valência moral existe de facto um precioso equilíbrio entre amor e respeito que cria o espaço comum em que se realizam a comunicação e a partilha. O amor tem portanto a tutelá-lo as exigências do respeito. Justamente por isto, Kant coloca reservas à compaixão que, sobretudo quando se exprime em termos de simpatia empática, priva o outro da sua dignidade.
Vergílio Ferreira e María Zambrano ou uma Estética do “Exílio”
Authors: Bijóias Mendonça Ana Maria ,   Philosophy Documentation Center
Published: October 2021

De um modo sucinto e claro, pretendemos abordar a figura do exílio como força motriz, aglutinadora, e porque não, omnipresente na obra literária e filosófica dos autores que nos propomos agora tratar. Com efeito, forçada a abandonar Espanha em 1939 juntamente com outros intelectuais, rumo a um doloroso exílio de quarenta e cinco anos, María Zambrano matura, a partir desta condição (e por causa dela?) as que serão linhas mestras do seu pensamento. Vergílio Ferreira viveu, se assim se pode chamar, um exílio de carácter mais “metafórico”. Não obstante, tomou para si também o desconforto e a des-pertença dos que não têm um lugar próprio, ou dos que o perderam. Os se us livros, escritos ao sabor da memória (e de memórias), procuram, buscam, escavam quase arqueologicamente um tempo feliz de raízes, um espaço topofílico perdido.
Survival of femur fractures in wild stoats (Mustela erminea)
Authors: King CM
Published: October 2021

Stoats (Mustela erminea) are active hunters and, therefore, one might predict that any broken bones or other injuries impeding active movement would incur a serious risk of starvation. Dead stoats (n = 560) were collected from trappers operating predator control lines in three conservation areas of New Zealand from 1972-1978. Femurs were cleaned and examined for healed injuries and deformities. Five femurs from four stoats (one with both femurs injured) showed traumatic distortions following healing of complete breaks incurred during life. A further case recorded during post-eradication monitoring in 2010 on Rangitoto, an offshore island, is added. These data provide evidence that wild stoats have a remarkable capacity to tolerate catastrophic femur fractures. They can survive long enough, despite the implied limitation to their energetic hunting style, to permit full healing even though the result is a gross distortion of the femoral shaft.
A Comparison of 5G Channel Coding Techniques
Authors: Čarapić Darija , Maksimović Mirjana
Published: October 2021

The rapid, reliable, and secure data transmission in everyday life and numerous applications is one of the crucial demands of modern society. Mobile wireless communications have advanced significantly in recent decades. From the first (1G) to fifth-generation (5G) of mobile communications, the realization of fast and secure communication has always been challenging as data transfer happens in an imperfect channel environment where noise due to amplification, distortion, and other impairments is present. Channel coding is key to establishing fast communication with low error probability, implying that choosing the proper channel coding scheme is a challenging and crucial task. Higher flexibility and reliability, and low computational complexity, latency, and costs are desired coding technique characteristics. This paper focuses on two 5G channel coding techniques, Low-Density Parity-Check (LDPC) and Polar codes. These codes have been examined in the case of variable message sizes and for a wide range of code rates. In addition, different Polar decoding algorithms have been investigated. Simulations results have confirmed that there is no single channel coding scheme able to meet all 5G requirements as well as the superiorities of LDPC codes in case of long messages and Polar codes for short messages. The ability to support a wide range of code lengths and code rates and excellent Bit Error Rate (BER) performances, justify the utilization of LDPC and Polar codes in 5G communication systems.
Age-aware Adaptive Routing for Network-on-Chip Routing with Odd-Even Turn Model
Authors: Saliu M. S , Umoh I. J , Sadiq B.O. , Momoh M.O
Published: October 2021

This paper presents an age-aware adaptive routing for Odd-Even (OE) turn model. As packets traverse from source to destination node, their paths are defined by a given routing algorithm. For a selected routing algorithm, an efficient arbitration technique is crucial to sharing critical Network-on-Chip resources. Arbitration techniques provide high degree of local fairness from each router point of view. However, there is delay of a packet with a longer path between the source and destination nodes. In order to address this challenge an age-based arbitration technique is hereby proposed for adaptive routing with OE turn model. The age-aware adaptive routing uses an age-based arbitration technique that gives priority to oldest packet. The performance of the developed age-aware adaptive routing was evaluated using different synthetic traffic at different Packet Injection Rates (PIRs). Results were compared with the result obtained on fair arbitration technique for adaptive routing using average latency and throughput as performance metrics. The result indicated that the age-aware adaptive routing has 2.73%, 6.63 %,5.4% and 4.5 % reduction in latency under random, transpose 1 transpose 2 and bit reversal traffic patterns respectively when compared to fair arbitration adaptive routing with OE turn model. For throughput the results indicated that the age-aware adaptive routing with OE turn model has 14.22%, 13%.12% and 19% increase in throughput under random, transpose 1 transpose 2 and bit reversal traffic patterns respectively when compared to fair arbitration adaptive routing with OE turn model.
Electrical Drives Control via Discrete-Time Variable Structure Systems with Sliding Mode
Authors: Milosavljević Čedomir , Peruničić-Draženović Branislava , Huseinbegović Senad , Veselić Boban , Petronijević Milutin P.
Published: October 2021

Modern control techniques of electrical drives (EDs) use robust control algorithms. One of such algorithms is variable structure control (VSC) with sliding mode (SM). SM control needs more information on the controlled plant than the conventional PI(D) control. Valid mathematical model of the controlled plant is necessary for the SM controller design. Generalized mathematical model of two-phase electrical machine and its adaptation to direct current (DC) and induction motor (IM) are given in this paper, employed in the cascade control structure. Also, the basic SM control theory and discrete-time controller design approach, developed by the authors, are given. Finally, experimentally realized examples of speed and position control of DC and IM are given as an illustration of the efficiency of the promoted EDs controller design via discrete-time VSC.
Association of Urolithiasis With Osteoporosis in Postmenopausal Women: Risk Predictors for the Disease
Authors: Bijelić Radojka , Miličević Snježana
Published: October 2021

Urolithiasis and osteoporosis are two significant multifactorial diseases that cause the constant increase in the number of affected persons due to the increased age of population and negative effects of environmental factors, i.e. unhealthy lifestyle. Those affected by urolithiasis have an increased risk for osteoporosis. Association of urolithiasis and osteoporosis in postmenopausal women is still not completely understood, but it is certain that those diseases may cause serious consequences leading to the permanent disability and even death due to osteoporotic hip fractures. This is why those disorders remain very significant social, economic and health problems not only for those affected but for the whole society, due to very high treatment costs. Identification of risk factors for menopausal women aims at decreasing the rate of disease and improving of preventive measures. Since both disorders are preventable, preventive measures should be applied from young age, with identification of risk factors being extremely important for significant decrease of morbidity rate.
Microplastic pollution: Sources, fate, impacts and research gaps
Authors: Ashir Hameed Muhammad , Rahman Farooqi Zia Ur , Younas Fazila , Ud Din Waqas Mohy , Mahroz Hussain Muhammad , Ayaz Khilji Sheza
Published: October 2021

The occurrence of microplastics into the ecosystem has become and eminent threat for the environment as well as gets extensive attention in recent times. Microplastic existence has severely affected lakes, rivers, oceans, coastal zones, and even polar zones biome. Microplastics (primary microplastics) mostly come from used products and by shattering of larger fragments. Through runoff, the microplastic enters into either aquatic or terrestrial environment where it can cause the devastating impacts not only to that ecosystem but also to the humans. Several studies professed that microplastics have a significant impact on marine and terrestrial communities. Microplastic particles are widespread in India, Asia, Southeast Asia, North America, Africa, South Africa, and Europe. The microplastic source and global distribution in the ecosystem, their effects on marine organisms, particularly in the food chain are illustrated in this review. Finding the principal sources of microplastic into the environment and raising the awareness among communities can significantly reduce the extent of microplastics pollution in the environment. This review article is an effort to create understanding about the microplastics pollution, sources and effects on environment. All the possible environmental friendly remediation strategies like bioremediation are also discussed in this article.
Essential Oils as Green Repellents Against Mosquito Vectors
Authors: Atkovska Katerina , Kuvendziev Stefan , Mustafa Erhan , Marinkovski Mirko , Ghaffari Peyman , Lisichkov Kiril
Published: October 2021

The mosquitoes are a serious threat to public health, since they are known vectors of many life-threatening diseases. Mosquito-borne diseases cause millions of deaths worldwide every year. While mosquitoes are important to maintain ecosystems, the aim is to keep them out of our personal space. People looking for alternatives to synthetic mosquito repellents may find that some natural repellents are effective in protecting them from bites. Natural insect repellents use natural ingredients such essential oils and other plant-based elements. Certain essential oils are effective and helpful in repelling mosquitoes, and are a natural alternative to the harsh chemicals in commercial bug sprays. These products are also likely to be less toxic to humans and the environment. Natural repellents and some essential oils may be effective in keeping mosquitoes away because they block their sense of smell. Many natural scents that are appealing to humans actually repel mosquitoes. Plant - based repellents are becoming more widely used as a protecting measure against mosquito bites, but more research is needed to develop natural repellents in terms of improving their repellent efficiency as well as in terms of their safety for use. This article presents a review about the best essential oils used as green repellents against mosquito bites, their efficiency, development and testing.
Role of Sanitary Engineers in Prevention of Covid-19 Pandemic
Authors: Vujasinović Darko , Stijepić Milka , Grujić Radoslav
Published: October 2021

Among the most emphasized consequences of pandemic COVID-19 influence is a negative trend of economic development and lock down of many production companies. One of areas where sanitary engineers can be engaged is drinking water safety and safety of wastewater. The new situation requires the change of actual teaching content during the teaching process of sanitary engineers, with the purpose of their training for inclusion in activities on prevention of virus spreading and controlling subjects in charge of people health protection, food safety and protection of living environment. It is very important that higher school institution authorities become familiar with knowledge gaps, potential implications on food, water and environment safety, research direction and other issues related to virus control, among which is also SARS–COV-2. The aim of this work is to encourage wider discussion on promotion of the actual study programs on higher institutions in Bosnia and Herzegovina and neighbouring countries as well as development of content proposals, which can lead to knowledge promotion, and competence of graduated students. During the recent discussion, we came to conclusion that it is necessary to develop studies, which have multidisciplinary approach, including the area of public health system, quality, food safety, environment protection and administrative law. Apart from that, students should obtain the necessary knowledge level in area of organization, management and economy, and with the purpose of enabling continuous production and income creation. We should also develop student research capabilities.
Influence of Basic-Motor Abilities on Efficiency of Realization of Specific Motor Tasks In Swimming
Authors: Bajrić Osmo , Mikić Branimir , Bajrić Senad , Mirvić Edin , Goranović Slobodan
Published: October 2021

The research was conducted on a sample of 70 respondents-swimmers aged 13-15 years of swimming clubs from Sarajevo Canton/Federation of BiH, with the aim of determining the significance and magnitude of the impact of selected basic motor skills on the implementation of specific motor tasks in swimming (navigability in place, sliding length with reflection from water, start from starting block, parallel). The study used 10 variables to assess basic motor skills, which were the input or predictor set of variables, and three variables to assess the efficiency of specific motor tasks in swimming as a criterion, each variable from the battery of specific motor tasks was considered as a criterion on the predictor set of basic-motor variables. Three mini regression analyzes were applied to determine the statistical significance and relative influence of basic motor skills on the realization of specific motor tasks in swimming (buoyancy in place, length of sliding with reflection from water, start from the starting block, parallel). The results of regression analyzes indicate that the greatest influence on the overall efficiency in the implementation of specific motor tests in swimming, looking at all criterion variables together, from the set of basic-motor variables, as a predictor set, show the following variables: stick twist-MFLISK MFLPRK, plantar flexion-MFLPL, long jump from place-MFESDM, agility on the ground-MKOKNT and shelter in lying-MRCZTL. The results obtained in this research can be useful for teachers and swimming trainers who work with younger age categories for the purpose of better programming of training work and selection of training content.
Education and literature: reflections on social, racial, and gender matters
Authors: Pereira Fernando Mota
Published: October 2021

“Educação e Literatura” busca mapear o significado da educação em textos literários de diferentes escritoras(es) ao redor do mundo. Fernanda Mota Pereira entrecruza linguística aplicada crítica com estudos pós-coloniais, estudos culturais e pedagogia crítica, para produzir esse estudo interdisciplinar inovador. Tendo vivido o processo educacional em dupla perspectiva – a universidade e a sala de aula do ensino médio -, a autora possui a escola como seu local de fala. Portanto, a obra, assim como a educação, tem o papel de refletir sobre as questões raciais, sociais e de gênero que permeiam essa área. Útil para docentes e discentes de língua estrangeira (não somente inglês), “Educação e Literatura” poderá ser capaz de nortear politicamente o processo de empoderamento proporcionado pelo aprendizado de uma língua, por meio da riqueza e complexidade dos textos literários sugeridos e explorados. O livro ainda analisa importantes obras contemporâneas, como “Push”, de Sapphire (que inspirou o filme “Preciosa – Uma história de esperança”), e “A cor púrpura”, de Alice Walker.
Frequency Reconfigurable Multiband MIMO Antenna Base on Gradient Arcs for IoT Devices
Authors: Tu D. T. T. , Sang N. V.
Published: October 2021

A frequency reconfigurable multi-band MIMO antenna is presented in this study. The single antenna consists of only one PIN diode that can change antenna operating frequencies from different quad-band to another one. Their bands not only cover the popular NB-IoT bands such as 900MHz, 1.8GHz, 2.4GHz for  Z-Wave, ZigBee, RFID, GSM communication but also contain 5G IoT bands which are 2.4GHz, 2.6 GHz and 5GHz for LTE-A, 802.11n, ac, and 5G below 10GHz. Basing on the complex structure of ring and new moon shape, the single antenna achieves a compact size of 30 mm x 30 mm x 1.6 mm which is about 76% reduction compared to a conventional ring antenna at 900MHz. Besides, a structure of gradient arcs is proposed to decrease mutual coupling among closed-spaced elements of MIMO antenna for the distance of 0.033l at the lower band from edge to edge. The proposed antennas are analyzed by CST software, VNA measurement, and IEEE 802.11 USB Adapter that the simulated, measured as well as experimental results are agreed well.
Modified Theory of Physical Optics Approach to Diffraction by an Interface between PEMC and Absorbing Half-Planes
Authors: Umul Y. Z.
Published: October 2021

The scattering of electromagnetic plane waves by an interface, located between perfect electromagnetic conductor and absorbing half-planes is investigated. The perfect electromagnetic conductor half-plane is divided into perfect electric conductor and perfect magnetic conductor half-screens. The same decomposition is done for the absorbing surface. Then four separate geometries are defined according to this approach. The scattered fields by the four sub-problems are obtained with the aid of the modified theory of physical optics. The resultant scattering integrals are combined in a single expression by using key formulas, defined for the perfect electromagnetic conductor and absorbing surfaces. The scattering integral is asymptotically evaluated for large values of the wave-number and the diffracted and geometric optics fields are obtained. The behaviors of the derived field expressions are analyzed numerically.
Changes in diversity and composition of rhizosphere bacterial community during natural restoration stages in antimony mine
Authors: Duan Renyan , Lin Yuxiang , Zhang Jianing , Huang Minyi , Du Yihuan , Yang Li , Bai Jing , Xiang Guohong , Wang Zhigao , Zhang Yaqi
Published: October 2021

Background

Open pit antimony (Sb) mining causes serious soil pollution, and phytoremediation is a low-cost approach to remediate heavy metal contaminated soil. Rhizosphere bacteria play an important role in ecological restoration in mining areas. There is a knowledge gap on how to find suitable rhizosphere microorganisms to improve the phytoremediation effect. Understanding the differences of rhizosphere bacterial diversity in different restoration stages is helpful to find suitable bacteria for ecological restoration.

Methods

A method of the substitution of “space” for “time” was used to study the effect of natural restoration on rhizosphere bacterial community. According to the dominant vegetation types (herb, shrub, and tree) in the natural restoration area of Sb mining, the early restoration (ER), middle restoration (MR), and later restoration (LR) from the largest Sb mine (Xikuangshan mine) in the world were selected to evaluate the differences in the composition and diversity of rhizosphere bacteria during three natural restoration stages. Each restoration stage had five samples. To determine the relationship between restoration stages and bacterial diversity in the rhizosphere, high throughput sequencing of PCR amplified were used.

Results

Alpha diversity, as assessed by Chao indices, appeared lowest in ER but this trend was not seen with other diversity metrics, including the Simpson and Shannon. Beta diversity analysis suggested there were differences in rhizobacterial community structure associate with restoration stage. At the phylum level, natural restoration led to a significant increase in the relative abundance of Actinobacteria in the MR, and a significant decrease in the relative abundance of Patescibacteria in the LR. Additionally, Calditrichaeota, Deferribacteres and Epsilonbacteraeota were only found in ER. At the genus level, the relative abundance of RB41 and Haliangium were highest in LR plots, while that of Bacillus and Gaiella were highest in ER plots. Additionally, the Azorhizobium genus was only detected in the ER phase. Overall, our findings suggested that several rhizosphere microbial communities had significant differences among three natural restoration stages (ER, MR, and LR) and the rhizosphere bacterial communities mainly appeared in the early restoration stage can be preferred for remediation of pollution soil in Xikuangshan.
An Empirical Analysis of Timber Trade in India
Authors: Shobika R. , Selvanayaki S. , Deepa N. , Vasanthi R.
Published: October 2021

Forests are renewable resources that contribute significantly to economic growth. The economic contribution by forest is through the valuable commodities including wood, paper and non-timber forest products. One among this is timber, it has been the primary material for house construction and furnishings of all kinds over the years. Timber plays a vital role in international trade in India. This study was focused on finding growth pattern in export and import of timber using Compound Annual Growth Rate (CAGR). Over the period of 2005-2019, the production of timber has been increased at the rate of 0.07%. The import performance was dominant over the export due to over requirements of raw materials. Although export showed positive growth rate at 0.15%, import of timber shot up at 4.09% from 2005-2019. Therefore, it is necessary to introduce adequate due diligence system to meet domestic demand of timber production in India.
Treatment evaluation of Kami Guibi‐tang on participants with amnestic mild cognitive impairment using magnetic resonance imaging on brain metabolites, gamma‐aminobutyric acid, and cerebral blood flow
Authors: Cho Seung‐Yeon , Kwon Sharonkyuhee , Shin Hee‐Yeon , Kim Ha‐Ri , Kim Jeong‐Hwa , Park Soonchan , Ryu Chang‐Woo , Park Jung‐Mi , Edden Richard A.E. , Jahng Geon‐Ho
Published: October 2021

Purpose

To evaluate the effectiveness of Kami Guibi‐tang (KGT) in the treatment of mild cognitive impairment (MCI) using magnetic resonance imaging (MRI) on brain metabolites, neurotransmitter, and cerebral blood flow (CBF).

Methods

We randomly allocated a total of 30 MCI patients to a KGT (N = 16) or a placebo (N = 14) group and performed MRI scans before and after 24 weeks of treatment. The participants underwent brain magnetic resonance spectroscopy and MRI scans to obtain brain metabolites using Point‐RESolved Spectroscopy (PRESS) single‐voxel spectroscopy, gamma‐aminobutyric acid (GABA) neurotransmitter using Mescher–Garwood PRESS, and CBF using pseudocontinuous arterial spin labeling sequences using a 3.0 Tesla MRI system. We analyzed metabolite and neurotransmitter levels and CBF using repeated‐measure analysis of variance to evaluate between‐subject group effect, within‐subject treatment condition effect, and interaction of group by condition (group x condition).

Results

The GABA+/creatine (Cr) ratio values were not significantly different between the before and after treatment conditions. The glutamate complex/Cr ratio difference before and after treatment was lower in the KGT group than in the placebo group, but was not statistically significant (p = 0.077). The result of region of interest–based CBF measurement showed that CBF values were significantly lower after treatment at Cluster 2 for the KGT group (p = 0.003) and the placebo group (p = 0.011), at hippocampus for the KGT group (p = 0.004) and the placebo group (p = 0.008), and at the fusiform gyrus for the KGT group (p = 0.002). Furthermore, the absolute CBF difference before and after treatment in the fusiform gyrus was significantly lower in the KGT group than in the placebo group (p = 0.024).

Conclusions

Although a KGT treatment of 24 weeks showed some significant impact on the level of CBF, the Korean version of the mini‐mental state examination score was not significantly different between before and after treatment conditions, indicating that there was no memory function improvement after treatment in amnestic MCI patients. Therefore, further studies should be performed with a relatively larger population and extending the duration of the KGT treatment.
Development of a novel program for conversion from tetrahedral‐mesh‐based phantoms to DICOM dataset for radiation treatment planning: TET2DICOM
Authors: Cheon Bo‐Wi , Lee Se Hyung , Han Min Cheol , Min Chul Hee , Han Haegin , Kim Chan Hyeong , Kim Jin Sung
Published: October 2021

Purpose

Tetrahedral mesh (TM)–based computational human phantoms have recently been developed for evaluation of exposure dose with the merit of precisely representing human anatomy and the changing posture freely. However, conversion of recently developed TM phantoms to the Digital Imaging and Communications in Medicine (DICOM) file format, which can be utilized in the clinic, has not been attempted. The aim of this study was to develop a technique, called TET2DICOM, to convert the TM phantoms to DICOM datasets for accurate treatment planning.

Materials and methods

The TM phantoms were sampled in voxel form to generate the DICOM computed tomography images. The DICOM‐radiotherapy structure was defined based on the contour data. To evaluate TET2DICOM, the shape distortion of the TM phantoms during the conversion process was assessed, and the converted DICOM dataset was implemented in a commercial treatment planning system (TPS).

Results

The volume difference between the TM phantoms and the converted DICOM dataset was evaluated as less than about 0.1% in each organ. Subsequently, the converted DICOM dataset was successfully implemented in MIM (MIM Software Inc., Cleveland, USA, version 6.5.6) and RayStation (RaySearch Laboratories, Stockholm, Sweden, version 5.0). Additionally, the various possibilities of clinical application of the program were confirmed using a deformed TM phantom in various postures.

Conclusion

In conclusion, the TM phantom, currently the most advanced computational phantom, can be implemented in a commercial TPS and this technique can enable various TM‐based applications, such as evaluation of secondary cancer risk in radiotherapy.
Fundamental relationships of executive functions and physiological abilities with game intelligence, game time and injuries in elite soccer players
Authors: Scharfen Hans‐Erik , Memmert Daniel
Published: October 2021

The study examined the (1) interrelation of cognitive‐athletic performance concerning game time and (2) injuries; (3) relation between executive functions and game intelligence. A total of 172 elite soccer players (age: 12–34 years) performed tests assessing multiple‐object‐tracking, working memory capacity (WMC), cognitive flexibility (CF), and inhibition. General and specific‐endurance‐performance, and physical performance (jumps and sprint) were also measured. Game intelligence, time and injuries were tracked. WMC, CF, and a total cognition score showed correlations with game intelligence, and the same parameter, along with selective attention and game intelligence were also correlated with game time. Sprint and specific‐endurance were connected with game time, whereas contact injuries only correlated with sprint, and noncontact injuries with sprint and general‐endurance. Especially executive functions represent fundamental associations with game intelligence and ‐time across all age groups, whereas certain physiological abilities may contribute to more game time and less non‐contact injuries depending on age.
Natural Biomaterials from Biodiversity for Healthcare Applications
Authors: Insuasti‐Cruz Erick , Suárez‐Jaramillo Victoria , Mena Urresta Kevin Andres , Pila‐Varela Kevin O. , Fiallos‐Ayala Xiomira , Dahoumane Si Amar , Alexis Frank
Published: October 2021

Natural biomaterials originating during the growth cycles of all living organisms have been used for many applications. They span from bioinert to bioactive materials including bioinspired ones. As they exhibit an increasing degree of sophistication, natural biomaterials have proven suitable to address the needs of the healthcare sector. Here the different natural healthcare biomaterials, their biodiversity sources, properties, and promising healthcare applications are reviewed. The variability of their properties as a result of considered species and their habitat is also discussed. Finally, some limitations of natural biomaterials are discussed and possible future developments are provided as more natural biomaterials are yet to be discovered and studied.
Doping‐Induced Dielectric Catastrophe Prompts Free‐Carrier Release in Organic Semiconductors
Authors: Comin Massimiliano , Fratini Simone , Blase Xavier , D'Avino Gabriele
Published: October 2021

The control over material properties attainable through molecular doping is essential to many technological applications of organic semiconductors, such as organic light‐emitting diodes or thermoelectrics. These excitonic semiconductors typically reach the degenerate limit only at impurity concentrations of 5–10%, a phenomenon that has been put in relation with the strong Coulomb binding between charge carriers and ionized dopants, and whose comprehension remained elusive so far. This study proposes a general mechanism for the release of carriers at finite doping in terms of collective screening phenomena. A multiscale model for the dielectric properties of doped organic semiconductor is set up by combining first principles and microelectrostatic calculations. The results predict a large nonlinear enhancement of the dielectric constant (tenfold at 8% load) as the system approaches a dielectric instability (catastrophe) upon increasing doping. This can be attributed to the presence of highly polarizable host–dopant complexes, plus a nontrivial leading contribution from dipolar interactions in the disordered and heterogeneous system. The enhanced screening in the material drastically reduces the (free) energy barriers for electron–hole separation, rationalizing the possibility for thermal charge release. The proposed mechanism is consistent with conductivity data and sets the basis for achieving higher conductivities at lower doping loads.
Toward Perfect Optical Diffusers: Dielectric Huygens’ Metasurfaces with Critical Positional Disorder
Authors: Arslan Dennis , Rahimzadegan Aso , Fasold Stefan , Falkner Matthias , Zhou Wenjia , Kroychuk Maria , Rockstuhl Carsten , Pertsch Thomas , Staude Isabelle
Published: October 2021

Conventional optical diffusers, such as thick volume scatterers (Rayleigh scattering) or microstructured surface scatterers (geometric scattering), lack the potential for on‐chip integration and are thus incompatible with next‐generation photonic devices. Dielectric Huygens’ metasurfaces, on the other hand, consist of 2D arrangements of resonant dielectric nanoparticles and therefore constitute a promising material platform for ultrathin and highly efficient photonic devices. When the nanoparticles are arranged in a random but statistically specific fashion, diffusers with exceptional properties are expected to come within reach. This work explores how dielectric Huygens’ metasurfaces can implement wavelength‐selective diffusers with negligible absorption losses and nearly Lambertian scattering profiles that are largely independent of the angle and polarization of incident waves. The combination of tailored positional disorder with a carefully balanced electric and magnetic response of the nanoparticles is shown to be an integral requirement for the operation as a diffuser. The proposed metasurfaces’ directional scattering performance is characterized both experimentally and numerically, and their usability in wavefront‐shaping applications is highlighted. Since the metasurfaces operate on the principles of Mie scattering and are embedded in a glassy environment, they may easily be incorporated in integrated photonic devices, fiber optics, or mechanically robust augmented reality displays.
Single Electron Transfer‐Induced Selective α‐Oxygenation of Glycine Derivatives
Authors: Venugopal Navyasree , Moser Johannes , Vojtíčková Margaréta , Císařová Ivana , König Burkhard , Jahn Ullrich
Published: October 2021

Modification of amino acids is an important strategy in organic and bioorganic chemistry. In contrast to common side‐chain functionalization, backbone modification is much less explored. Especially glycine units seem to be attractive and versatile since a wide range of functionality can be potentially introduced. We report here oxidative modification of glycinates that are stable and enable further functionalization. Selective glycinate enolate oxidation by TEMPO or a FeCp2PF6/TEMPO reagent combination provides stable alkoxyamines in good to excellent yields. The methodology is expanded to glycine‐containing dipeptides demonstrating selective oxygenation at the glycine unit. The orthogonal reactivity potential of oxygenated glycines for transformation to other amino acid derivatives is explored.

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Skeletal muscle gauge as a prognostic factor in patients with colorectal cancer
Authors: Park In Kyu , Yang Song Soo , Chung Eric , Cho Eun‐Suk , Lee Hye Sun , Shin Su‐Jin , Im Yeong Cheol , Park Eun Jung , Baik Seung Hyuk , Lee Kang Young , Kang Jeonghyun
Published: October 2021

Background

Although skeletal muscle index (SMI) and radiodensity (SMD) are well‐known prognostic factors, the clinical impact of the integrated measure, known as skeletal muscle gauge (SMG), has been limited in patients with colorectal cancer (CRC).

Patients and Methods

A total of 727 and 268 patients with CRC at two tertiary centers were included and allocated into the training and test sets, respectively. Preoperative slice computed tomography images of the third lumbar area were evaluated for SMI and SMD. SMG was calculated as SMI × SMD and expressed as an arbitrary unit (AU). The optimal cutoff SMG value was determined to maximize the overall survival (OS) difference between the groups with respect to sex in the training set. The multivariate Cox proportional hazard model evaluated the association of its clinical significance.

Results

With regard to SMG, 1640 and 1523 AU were identified as cutoff values for males and females, respectively. The patients with low SMG values showed significantly worse 5‐year OS than those with high SMG values in the two datasets (both p < 0.001). In the multivariate analysis, low SMG was identified as an independent poor prognostic factor of OS in the training set (hazard ratio 2.18, 95% confidence interval 1.43–3.32, p < 0.001) and test set (hazard ratio 1.79, 95% confidence interval 1.07–3.00, p = 0.025), whereas SMI and SMD were not.

Conclusion

SMG acts synergistically to improve its prognostic predictive accuracy as compared with SMI or SMD alone in patients with CRC. Additional research is warranted to define its significance in different ethnic groups.
Dermatomyositis‐lupus overlap syndrome complicated with cardiomyopathy after SARS‐CoV‐2 infection: A new potential trigger for musculoskeletal autoimmune disease development
Authors: Shahidi Dadras Mohammad , Rakhshan Azadeh , Ahmadzadeh Arman , Hosseini Seyed Ali , Diab Reem , Safari Giv Toktam , Abdollahimajd Fahimeh
Published: October 2021

COVID‐19 should be considered as a new triggering factor for autoimmune disorders like DM‐lupus overlap syndrome. We recommend that patients presenting with dermatomyositis during this pandemic be screened for COVID‐19.