bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Roasting Prior to The Leaching Process of Alkalinized Ferronickel Slag Followed by Precipitation Process
Authors: Mayangsari Wahyu , Prasetyo Agus Budi , Febriana Eni , Irawan Januar , Subagja Rudi , Firdiyono Florentinus , Soedarsono Johny Wahyuadi
Published: September 2021

Terak feronikel dihasilkan sebagai produk samping dari produksi feronikel. terak feronikel mempunyai potensi sebagai bahan baku beberapa komponen berharga karena komposisinya melalui proses bertahap. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh dari proses pemanggangan campuran terak feronikel dan Na2CO3 sebelum leaching air panas dan presipitasi untuk menghasilkan endapan silika. Proses pemanggangan terak feronikel dengan penambahan Na2CO3 telah dilakukan untuk pembentukan natrium silikat. Kemudian dilarutkan melalui proses pelindian menggunakan air panas 90 ° C selama 120 menit. Endapan silika didapatkan dengan proses presipitasi sodium silikat terlarut diikuti dengan pemeraman selama tiga hari. Berdasarkan hasilnya, pemanggangan menyebabkan perubahan komposisi yang mempengaruhi persen pelindian dan perolehan silika. Reaksi terjadi dari permukaan ke inti yang dibuktikan dengan pengecilan ukuran residu pelindian dari RAF nya. Natrium silikat dalam bentuk Na4SiO4  diketahui terlarut Ketika pelindian air dilakukan. Pengendapan dan pemeraman larutan natrium silikat telah menghasilkan endapan silika dengan ukuran partikel lebih dari 100 mm. pemanggangan pada 1000 ° C selama 240 menit menghasilkan perolehan silika tertinggi.
Case of laser induced maculopathy and treatment outcome after use of corticosteroids and lutein.
Authors: Marinescu Anca , Hall Caterina
Published: September 2021

Introduction:A 30yopatient presented sudden decrease of left vision and metamorphopsia after staring at a laser in a nightclub five days before.

Results:At presentation left visual acuitywas 6/18-2 unaided improving to 6/12-2 pinhole.Dilated fundoscopy showed a yellow-orange foveolar lesion in the left eye. OCT showed an alteration of foveal anatomy involving predominantly the outer retinal layers, hyper-reflective vertical band and large cystoid change at the inner retina. There was an increase of foveolar thickness to 397µ.Treatment was with oral corticosteroids (Prednisolone 0.5mg/ Kg).At one week left visual acuityimprovedto 6/12+2.There were hardly any cystic changes, with less hyper-reflective band and disruption at the outer layer.Lutein capsules 20 mg daily were added at one week. At three weeks patient reported vision back to normal - the left visual acuity was 6/6-2 unaided. OCT showed near-complete restoration of macular structure.

Conclusions: Positive clinical outcome with combined oral corticosteroids and lutein over a short period of time in a typical case – further review recommended of ideal treatment regimes for laser induced maculopathy.
Sentiment Analysis and Topic Modeling of Indonesian Public Conversation about COVID-19 Epidemics on Twitter
Authors: Habibi Muhammad , Priadana Adri , Rifqi Ma’arif Muhammad
Published: September 2021

The World Health Organization (WHO) declared the COVID-19 outbreak has resulted in more than six million confirmed cases and more than 371,000 deaths globally on June 1, 2020. The incident sparked a flood of scientific research to help society deal with the virus, both inside and outside the medical domain. Research related to public health analysis and public conversations about the spread of COVID-19 on social media is one of the highlights of researchers in the world. People can analyze information from social media as supporting data about public health. Analyzing public conversations will help the relevant authorities understand public opinion and information gaps between them and the public, helping them develop appropriate emergency response strategies to address existing problems in the community during the pandemic and provide information on the population's emotions in different contexts. However, research related to the analysis of public health and public conversations was so far conducted only through supervised analysis of textual data. In this study, we aim to analyze specifically the sentiment and topic modeling of Indonesian public conversations about the COVID-19 on Twitter using the NLP technique. We applied some methods to analyze the sentiment to obtain the best classification method. In this study, the topic modeling was carried out unsupervised using Latent Dirichlet Allocation (LDA). The results of this study reveal that the most frequently discussed topic related to the COVID-19 pandemic is economic issues.
أثر المحاسبة الخضراء على ادارة الاحتواء العالي دراسة استطلاعية في المعهد التقني الموصل
Authors:   University of Mosul, Al-Shalama Maysun A. , Al-Jalali Hanan I. ,   Northern Technical University-Mosul Technical Institute, Al-Abajy Marwah L. ,   Northern Technical University-Mosul Technical Institute
Published: September 2021

يهدف البحث الحالي الى تقديم إطار نظري وعملي متكامل لدراسة المحاسبة الخضراء واثرها في ادارة الاحتواء العالي من خلال بيان اثر المحاسبة الخضراء وانعكاساتها في ادارة الاحتواء العالي لقيادات المعهد التقني الموصل احد تشكيلات الجامعة التقنية الشمالية ، الذي تم اختياريه من قبل الباحثات ميداناً للبحث الحالي ، وكما تم اختيار عينة مقدارها (25) ،وتعد دراسة المحاسبة الخضراء من المواضيع المهمة والتي من شانها ان ترفع مستوى المنظمات نحو تحقيق الاحتواء العالي ، ومن هنا انطلقت مشكلة البحث والتي صيغت من تساؤل رئيسي ، هل يوجد اثر للمحاسبة الخضراء على ادارة الاحتواء العالي ؟ ولتحقيق ذلك تم افتراض جوهري : يوجد اثر للمحاسبة الخضراء في ادارة الاحتواء العالي، وبهدف جمع البيانات تم الاعتماد على استمارة استبانة كأداة رئيسة للحصول على المعلومات المناسبة في الجانب الميداني اذ سيتم تحليلها باستخدام الوسائل الاحصائية عن طريق برمجة ال SPSS وتوصل البحث لعدة استنتاجات وفي ضوؤها تم اقتراح مجموعة من المقترحات الاساسية.
إدارة المحفظة الاستثمارية كأحد استراتيجيات الاستدامة المالية : دراسة تحليلية لعدد من الشركات في سوق العراق للأوراق المالية
Authors:   University of Tikrit, Mohamad Jamal H. , Yasin Zahida A. , Muhammed Layla A. ,   Northern Technical University-Baghdad,   University of Mosul
Published: September 2021

يركز البحث الى قياس الاستدامة المالية للمحفظة الاستثمارية من خلال نموذج شارب وتورينز ، فقد هدف البحث الى توضيح وبيان درجة التنويع في الاستثمارات فيالأنشطة المختلفة من خلال نموذج شارب وتورينز ، فقد كان مجتمع البحث سوق العراق للأوراق المالية معتمد عينة قصدية متمثلة بعدد من الشركات المدرجة ، فقد تم اختبارالنتائج من خلال التحليل المالي ، افترض البحث ان يسهم نموذج شارب وتورينز في قياس المحفظة الاستثمارية على تحقيق الاستدامة المالية في الشركات العراقية العاملةفي سوق العراق للأوراق المالية ، وقد استنتج البحث ان الشركات المبحوثة في السوق المالية العراقية تعمل في مؤشر جيد للعوائد على السهم اذ تختلف طبيعة العوائد حسبطبيعة النشاط ، كما يوصي البحث بضرورة التأكيد على اتباع استراتجية سليمة في السوق المالية وذلك من خلال اعتبار التنويع احد الأنشطة الأساسية في تحقيق العائد.
دور مؤشرات الحكم الصالح في زيادة حصلية الايرادات الضريبية: دراسة حالة عينة من الدول النامية
Authors:   Duhok Technical University, Sharfani Nasreen M. , Al-Safar Ahmed S. ,   University of Zakho
Published: September 2021

هذه تبحث هذه الدراسة في أهمية الحكم الصالح في إدارة اقتصاد الدولة ورفاهية المجتمع من خلال دورها في إصلاح النظام الضريبي القائم في البلد ومكافحة التهرب الضريبي مما يساعد في تنمية العوائد الضريبية، وتتناول الدراسة عينة من الدول النامية المختلفة من حيث مستويات الفساد وطبيعة نظام الحكم حسب المعايير التي تعتمدها منظمات النزاهة العالمية ومؤشراتها على المستوى الدولي. وتوصلت الدراسة إلى نتيجة مفادها بأن تبني مؤشرات الحكم الصالح (مكافحة الفساد وفعالية الحكومة وجودة التنظيم والمساءلة والشفافية والبيئة الآمنة والمستقرة سياسياً وسيادة القانون) يؤدي إلى الحد من التهرب الضريبي والغش والرشوة والاختلاس وزيادة الرغبة في دفع الضرائب مما يؤدي إلى زيادة حصيلة الإيرادات الضريبية. لذا يقترح الباحثان بهدف زيادة الإيرادات الضريبية من الضروري العمل على زيادة كفاءة النظام الضريبي وإعادة هيكلته بما يتناسب مع التطورات الاقتصادية بحيث يتسم بالشفافية والعدالة.
Necropolitics versus Biopolitics: Spatialization, White Privilege, and Visibility during a Pandemic
Authors: Rouse Carolyn M.
Published: September 2021

Anthropologists have used Michel Foucault’s thesis on biopolitics to critique modern institutions. Yet while useful, biopolitics is often misapplied. The arrests, killings of unarmed Blacks by police, COVID-19 racial health inequities, and the January 6 white nationalist act of sedition made visible fault lines between a biopolitical system set up to care for whites and a necropolitical system that treats Black bodies as expendable. By critiquing the facile overuse of biopolitics and biopower, this article also speaks to what COVID-19 uncovered within the academy.
Assessing the Influence of School Environmental Programmes on the Environmental Attitudes and Behaviour Among Secondary School Students in Muranga County, Kenya.
Authors: Gikonyo Josphat M. , Anyango Stephen O. , Agwata Jones F.
Published: September 2021

Environmental degradation is a major challenge which requires appropriate strategies to reverse the situation. One of such strategies is experiential environmental education among high school students who, through change of attitudes and behavior, are able to participate in various environmental management activities. In this study the pro-environmental attitudes and behavior of high school students in Murang’a County, Kenya were examined to assess how environmental education programmes among the students affected environmental issues of waste management, water resources management, natural resources management and climate change in the schools. Nine hundred and sixty-one (961) students from nineteen (19) high schools from two sub-counties in the County was used in the study. The Likert type questionnaire and the 2-MEV Scale were used to collect the required data. The t-test statistic was applied to determine any differences between the variables. Results showed significant differences in pro-environmental attitudes and behavior with regard to solid waste management, water resources management, natural resources management. There were significant differences with regard to solid waste management, natural resources management, climate change and environmental concerns between members of Environmental Clubs and non-members. Pro-environmental attitudes and behavior were influenced by current membership of the Clubs rather than past membership. It is concluded that experiential environmental programmes improve the student’s pro-environmental attitudes and behavior hence environmental management within the schools. It is recommended that appropriate policies be formulated to enhance the implementation of school experiential environmental programmes to ensure capacity building of the learners to effectively manage environmental issues in the schools.
Stress and the Well-being of Nurses: an Investigation using the Demands-Resources- Individual Effects (DRIVE) model and the Well-being Process Questionnaire (WPQ).
Authors: Williams Gary , Pendlebury Hannah , Smith Andrew
Published: September 2021

Previous research shows that nurses have high levels of stress, but less is known about their well-being. The present research used an adapted version of the Demands-Resources-Individual Effects (DRIVE) model to investigate these areas. The Well-Being Process Questionnaire (WPQ), which consists of single items derived from longer scales, was also used. One hundred and seventy-seven British nurses (160 female, 17 male) participated in an online survey. The results showed that work characteristics could be grouped into three factors (resources; demands; and role/change/bullying), as were personality scores (positive personality; openness, agreeable, conscientious; and extraversion, emotional stability). Coping (positive and negative coping) and outcomes (positive and negative outcomes, and positive and negative job appraisals) had a two-factor solution. Results from logistic regressions showed that well-being outcomes were predicted by high positive personality and low negative coping. Positive job appraisals were predicted by high resources and low demands. These findings confirm that the use of the DRIVE model and a single short item measuring instrument can quickly provide information about factors predicting the well-being of nurses.
Características de qualidade para substâncias inorgânicas em água mineral envasada comercializada na cidade de São Paulo/SP
Authors: Arauz Luciana Juncioni , Buzzo Márcia Liane , Verola Mataveli Lidiane Raquel , Henriques Carvalho Maria de Fátima
Published: September 2021

A água mineral é um recurso proveniente de fonte natural e importante à saúde humana, por possuir características químicas e físico-químicas em sua composição necessárias para a manutenção do equilíbrio adequado de diversos processos bioquímicos e mecanismos fisiológicos que ocorrem no organismo humano. Ainda, existe uma preocupação com a ingestão de contaminantes inorgânicos, de origem natural ou antropogênica, uma vez que esses elementos, mesmo em baixas concentrações, podem ser tóxicos e representar um problema de Saúde Pública. Portanto, é primordial avaliar a qualidade das águas minerais que são disponibilizadas para consumo da população, em atendimento à legislação Resolução-RDC 274/2005, quanto aos níveis de metais e semimetais. Este trabalho teve como objetivo realizar a quantificação dos elementos químicos Al, Ag, As, Ba, Be, Ca, Cd, Cr, Cu, K, Mg, Mn, Na, Ni, Se, Pb, Tl e Zn, em 10 amostras de águas minerais envasadas de procedência nacional, coletadas pela Vigilância Sanitária do Estado de São Paulo no comércio local, como parte integrante do Programa Paulista de Alimentos, entre 2018 e 2019, por Espectrometria de Massas por Plasma Indutivamente Acoplado. Para os elementos previstos na legislação vigente, foram obtidos resultados satisfatórios para todas as amostras de águas minerais analisadas. Para os demais analitos avaliados, os níveis obtidos também estavam abaixo dos valores preconizados pelas regulamentações internacionais. Os resultados obtidos neste estudo indicaram que as águas minerais das diferentes marcas comercializadas na cidade de São Paulo são adequadas e seguras para o consumo da população, em relação aos parâmetros avaliados.
Production of xylanase by Fusarium oxysporum using agro-industrial waste
Authors: Alves de Bastos Lunara Thais , Dias Batista Ryhára , Martins Lima Alanna Cristinne , Leandro dos Santos Iara , Coutinho de Paula-Elias Fabrício , Auler do A. Santos Cláudia Cristina , De Almeida Alex Fernando
Published: September 2021

This study aimed to optimize the production of xylanase, under submerged conditions using Fusarium oxysporum. Firstly, it was carried out the selection of the best source of carbon from agricultural waste, such as soybean husk, cassava peel, pineapple crown, corn straw, rice husk, bacaba, barley bagasse and, corncob. They were milled and sieved with a maximum granulation of 1 mm. The cultures were carried out by 132 hours 30 °C and 180 rpm. Among the agroindustrial residues, corn straw was the one that stood out with a greater enzymatic activity of 12.6 U/mL. In the second step, it was used Plackett-Burman design to screen the nutrients sources important to xylanase production. Thus, independent variables significant were urea and MgSO4. These variables selected by Plackett-Burman were then used in a Central Composite Rotational Design present activity of 26.6 U/mL and the predicted was 34.5 U/mL. So, the xylanase production by F. oxysporum can be optimize using corn straw, a low-cost waste found in large quantities.
In code we trust: the concept of rumūz in Andalusī alchemical literature and related texts
Authors: Moureau Sébastien , de Callataÿ Godefroid
Published: September 2021

In the medieval Arabic tradition of the so-called occult sciences, the concept of ramz (symbol, code) has acquired an important role in the way the authors were considering and reading the texts of their predecessors and writing their owns. This term, closely related to the notion of secret, covered various ideas of code: from allegories and allusions to codenames and secret alphabets. Above all, the alchemists made ramz a real topos of their literature. In this paper, we focus on the Rutbat al-ḥakīm of Maslama b. Qāsim al-Qurṭubī (written in 339–342/950–953) and some of its main sources, such as the corpus of texts attributed to Jābir b. Ḥayyān, Ibn Waḥshiyya’s Filāḥa Nabaṭiyya, the Rasā’il Ikhwān al-Ṣafāʾ and the Risāla Jāmiʿa. We argue that Maslama produced a detailed definition of ramz, conceived a true typology of it, and proposed his own key to reading the alchemical ramz. This rich development is not found in any of the other texts that we have examined here. This observation confirms that Maslama b. Qāsim al-Qurṭubī, far from being a simple transmitter of Eastern ideas and practices to the Western Arab-Muslim world, was an original and innovative milestone in the transfer of knowledge.
Retreating from Redistribution? Trends in Democratic Party Fidelity to Economic Equality, 1984–2020
Authors: Malpas Amelia , Hilton Adam
Published: September 2021

During his presidency, Barack Obama described rising economic inequality as “the defining challenge of our time.” But a growing number of scholars and journalists argue that rising inequality is in part a result of the Democratic Party’s diminishing fidelity to an egalitarian economic agenda and its embrace of neoliberalism. In this article, we assess the veracity of this claim through a content analysis of all national Democratic Party platforms issued since 1984. We find that broad assertions of Democratic retreat from economic equality are for the most part exaggerated. Specifically, we argue that Democrats’ support for egalitarian policies has been complex and varied over time, with a marked decline under the influence of the New Democrats in the 1990s followed by a significant resurgence thereafter. However, while party support for equalizing policies has rebounded overall, the extent of the party’s commitment to specific policies varies according to the purported deservingness of beneficiaries. Our findings have important implications for debates concerning Democratic Party change, the politics of inequality, and the policy agenda of the Joe Biden administration.
Two-photon fluorescent turn-on probes for highly efficient detection and profiling of thiols in live cells and tissues
Authors: Shen Congzhen , Zhang Duoteng , Xu Fang , Yang Yang , Tan Yi , Zhao Qian , Li Lin , Ding Ke , Li Zhengqiu
Published: September 2021

Thiols are important units in amino acids such as cysteine and peptides like glutathione. Development of chemical sensors capable of precise detection of thiols is important in cancer diagnosis and therapy. We have developed novel two-photon fluorescent turn-on probes for selective detection of thiols. The probes displayed excellent sensitivity and low detection limits. The dual-purpose probes have been demonstrated to be suitable for simultaneous imaging and proteome profiling in live cells and tumor tissues. The unique turn-on design endows the probes with excellent selectivity toward thiols in vitro and in situ, and can be further developed to support a thiol-quantification assay.
At Home in the World: Wandering Earth, Environmentalism, and Reimagined Homelands
Authors: Rojas Carlos
Published: September 2021

Based on a 2000 novella by Cixin Liu with the same title, Frant Gwo’s 2019 film Wandering Earth has been celebrated as China’s first big-budget science fiction film. As a Chinese film with a global theme that simultaneously targets both a domestic and an international audience, accordingly, the work invites a reflection on the relationship between the local and the global—on how we understand the concept of home, and what it might mean to be home in the world. This essay, accordingly, examines three intersecting ways in which Wandering Earth (both the film and the original novella) explores the relationship between home and the world, including the status of the Earth as an ecological system, the planet’s status as a lived environment, as well as a set of contemporary geopolitical discourses about China’s shifting position within the contemporary world order, and particularly its relationship to the Global South.
Intimations of Revelation 19–21 in the Early North African Christian Communities
Authors: Vercesi Martina
Published: September 2021

The purpose of this article is to provide a survey of the interpretation of Revelation 19–21 in the early North African Christian communities (II–III century). These chapters refer to one of the most controversial passages of John’s Apocalypse (the eschatological war, the millennial kingdom, and the descent of the New Jerusalem). After a brief methodological reflection, the article will investigate how these chapters were interpreted not only in the early Latin authors but also how this material was employed in martyrdom accounts as well. The study, in fact, will begin with the first Latin document of Christian literature, the Acta Martyrum Scilitanorum, followed by the corpus of Tertullian, the Passio Sanctarum Perpetuae et Felicitatis, and the writings of Cyprian.
Perception of Dark Tourism
Authors: Kleshcheva Aleksandra
Published: September 2021

In recent years, numerous studies have been conducted on the phenomenon of dark tourism. This study seeks to understand what motivates people to visit dark tourism sites such as the Chernobyl exclusion zone by applying an automated text analytics approach. Tripadvisor was chosen as a source for data collection as tourists are increasingly sharing their experiences and leave feedback online. Several natural language processing methods, such as topic modelling (LDA) and sentiment analysis, were applied to extract the primary motivators behind a visit to Chernobyl. Topic modelling results present five main topics discussed by tourists. Based on the results, the main motivational factors are discussed in detail. Furthermore, the total sentiment score shows a positive perception of the dark tourism destination. This study follows an interdisciplinary research approach applying innovative data analytics methods to investigate dark tourism through social media. By implementing NLP methods, this study reveals tourists’ perceptions from online reviews, which are not easy to discover by traditional approaches. Moreover, the results provide guidelines to tourism managers in monitoring new trends in tourism, understanding tourists’ needs and wishes, and evaluating the quality of products or services.
Geneza i charakterystyka prawa zamówień publicznych w Polsce międzywojennej
Authors:   Kolegium Ekonomiczno-Społeczne, Szkoła Główna Handlowa w Warszawie, Podolska-Meducka Aldona Barbara
Published: September 2021

Purpose – The purpose of this paper is to describe the public procurement law in the interwar Poland, preceded by its genesis. The significance of the law regulating the process of public funds expenditure derived from these funds coming largely from the state budget, and the public sector being a very important client on the domestic market. The adopted solutions had to take into account economic problems of the Polish state in the discussed period. Research method – Legislative and parliamentary material analysis was conducted, and a literature review was undertaken. Result – The pre-war Polish procurement law was enacted in a difficult domestic economic context. The legislator had to account for this and establish appropriate domestic market conditions, primarily for Polish entrepreneurs. In the 1920s, the legal regulations of the former partitioning states were applied. The 1930s brought uniform legislation for the entire country. Originality / value / implications / recommendations – Public procurement is a very important element of public finance. The rules that organize it, embodied in legal regulations, are an essential part of public funds spending transparency. Pre-war public procurement law became the basis for solutions adopted in Poland after the year 1989.
The Role of Porto University in the Development of Entrepreneurial Ecosystem
Authors:   Polytechnic Institute of Cávado and Ave, Portugal), Dieguez Teresa
Published: September 2021

This paper aims to share best practices of the Porto University (U. Porto) entrepreneurial ecosystem. Co-creation demands great dynamics and universities are the favourite partners in new technological grounds where uncertainty is a characteristic and knowledge a differentiation. Entrepreneurial ecosystem refers to the environment that affects the local/regional entrepreneurship and U. Porto, in Portugal, offers an example of excellency in the catalysts for technological innovation and financial attraction resources. As an extensive set of internal and external components, the U. Porto has gathered the potential to function as a sustainable infrastructure to support the creation of competitive technologies and start-ups. The present study shares insights into the types of agents, institutions, cultures and resources that an entrepreneurial ecosystem contains. In addition, it highlights governance, openness and decentralization of activities that has played a role in supporting student’s founders and their high-growth endeavours.
Catalytic pyrolysis of hemicellulose to produce aromatic hydrocarbons
Authors: Yang Yi , Luo Zhongyang , Li Simin , Lu Kongyu , Wang Wenbo
Published: September 2021

Catalytic fast pyrolysis of hemicellulose with zeolite catalysts is a promising method to produce aromatic hydrocarbons (Carlson et al. 2009). In this paper, the behavior of hemicellulose catalytic pyrolysis with HZSM-5 (with three different silica to alumina ratio, 23, 50, 80), HY, and Hβ was studied. Pyrolysis vapor was separated into non-condensable vapors and condensable fractions. The fractions were qualified and quantified by a gas chromatography / flame ionization detector (GC/FID) system and a gas chromatography / mass spectrometer (GC/MS) system, respectively. The influences of catalysts and pyrolysis parameters were studied. Among the catalysts, HZSM-5(23) provided the desired acidity and shape selectivity for aromatic hydrocarbon production. A higher catalyst to hemicellulose ratio (CHR) and higher heating rate resulted in a higher aromatic hydrocarbon yield. The most suitable pyrolysis temperature for hemicellulose with HZSM-5 was 650 °C. During catalytic pyrolysis, thermal decomposition products underwent deoxygenation reactions promoted by the acid sites on the zeolite. The C2-C4 deoxygenated products produced monocyclic aromatic hydrocarbons (MAH) by shape-selective catalysis reactions in zeolite pores. With higher temperatures and higher residence times, monocyclic aromatic hydrocarbons facilitated cyclization reactions with C2-C4 deoxygenated products, thereby forming polycyclic aromatic hydrocarbons (PAH).
On the Efficiency of Algorithms with Multi-level Parallelism
Authors: Popov Oleksandr , Chystiakov Oleksiy
Published: September 2021

The paper investigates the efficiency of algorithms for solving computational mathematics problems that use a multilevel model of parallel computing on heterogeneous computer systems. A methodology for estimating the acceleration of algorithms for computers using a multilevel model of parallel computing is proposed. As an example, the parallel algorithm of the iteration method on a subspace for solving the generalized algebraic problem of eigenvalues of symmetric positive definite matrices of sparse structure is considered. For the presented algorithms, estimates of acceleration coefficients and efficiency were obtained on computers of hybrid architecture using graphics accelerators, on multi-core computers with shared memory and multi-node computers of MIMD-architecture.
Biomechanical modeling and problematic issues of surgical correction of congenital funnel chest deformity
Authors:   Dnipro State Medical University, Ukraine, Dihtiar V.A. , Kaminska M.O. ,   Dnipro State Medical University, Ukraine
Published: September 2021

Congenital funnel chest deformity (CFCD) is noted in 0.6–2.3% of the population and accounts for 90% of all congenital chest deformities. Nuss thoracoplasty is the most common method for treating CFCD, which is considered a minimally invasive technology and provides a quick cosmetic effect. Purpose is to search for models of CFCD and its surgical correction in order to create a technique that is as close to reality as possible, which will make it possible to optimally plan and rationally carry out the forthcoming operation. Analysis of literature sources showed that, on the one hand, the construction of simplified models of the chest allows quick research, but these simplifications do not allow for an objective assessment of the influence and interaction of various elements of the complex biomechanical system «sternum–rib–spine». On the other hand, complex models are more reliable, but hardly available for implementation due to their ultra-high manufacturability and cost. In addition, in studies of stress-strain state on models of the chest, the presence of the spinal column or the interaction of the ribs with the vertebrae has been insufficiently studied. When in the works on modeling road traffic injuries this is justified due to the support of the spine on the seat, then when modeling the correction of chest deformities, the lack of consideration of the mobility of the articular joints and the flexibility of the spinal column can lead to incorrect and false results. It is promising to create a technique for modeling CFCD and its surgical correction in conditions close to reality. This will make it possible to develop a rational modification of thoracoplasty based on the D. Nuss operation under the condition of one–stage full–fledged stable correction and minimal biomechanical loads in the «sternum-rib-spine» system. No conflicts of interest was declared by the authors. Key words: funnel chest deformity, thoracoplasty, biomechanics.
PENGARUH LABA BERSIH TERHADAP DIVIDEN SERTA DAMPAKNYA PADA HARGA SAHAM PERUSAHAAN SEKTOR AGRIKULTUR YANG TERDAFTAR PADA BURSA EFEK INDONESIA
Authors: Mudzakir Ahmad
Published: September 2021

This study aims to determine how the effect of net income on stock prices directly and indirectly through the dividend variable in companies listed on the Indonesia Stock Exchange. The population in this study were companies listed on the Indonesia Stock Exchange for the period 2013 to 2018. After selecting the population according to the purposive sampling method, there were 5 companies in the agricultural sector used as samples. This research is an associative study with a quantitative approach. The study used a path analysis model using linear regression analysis techniques by first doing classic assumption tests such as normality test, heterocedasticity, multicollinearity and autocorrelation. The results showed that net income has a positive and significant effect on dividends, dividends have a positive but not significant effect on stock prices, net income has a positive and significant effect on stock prices, the direct effect of net income on stock prices is 0.613, the indirect effect of net income on prices shares through dividends of 0.224 and the effect of total net income on stock prices of 0.837.Keywords: net income, dividends, stock prices and path analysis
PENGARUH PSAK NO. 1 TENTANG PENYAJIAN LAPORAN CASH FLOW DAN CAPITAL EXPENDITURE TERHADAP FIRM VALUE PADA PERUSAHAAN YANG BERGERAK DI BIDANG CONSUMER GOOD YANG TERDAFTAR DI JAKARTA ISLAMIC INDEX PERIODE 2010-2019
Authors: Sakinah Gina , Ponirah Ade
Published: September 2021

Financial statements are prepared and presented to be submitted to those who need them. Of course, in this presentation must be in accordance with the existing provisions that are stipulated in PSAK No. 1 concerning the presentation of financial statements. Firm Value has an important role because it will form an image for the company, firm value is created by the contribution of other factors. Operation Cash Flow informs cash inflows and cash outflows from a company. Capital Expenditure as a reserve fund to support the expansion of the company or the improvement of assets. This research uses descriptive methods and quantitative approaches using secondary data supported by literature and documentation studies. The results showed that Operation Cash Flow partially has a positive and significant effect on Firm Value as well as Capital Expenditure has a positive and significant effect on Firm Value. Simultaneously both free variables can contribute and are able to significantly affect firm value.Keywords: Operation Cash Flow, Capital Expenditure, Firm Value
LEGITIMASI SYARIAH TERHADAP NILAI WAKTU UANG
Authors: Sopian Ahmad Ali
Published: September 2021

Nilai waktu uang pada sistem ekonomi konvensional dipandang bahwa uang bukan hanya berfungsi sebagai alat tukar (medium of exchange) dan kesatuan hitung (unit of account) tetapi juga berfungsi sebagai komoditas yang dapat diperjualbelikan hingga menghasilkan keuntungan.berdasarkan hal tersebut, uang dipandang memiliki nilai waktu (time value of money) bila di simpan dalam waktu tertentu yang diproksi dengan tingkat bunga. Dalam perspektif ekonomi Islam bunga dipandang sebagai hal yang haram. fatwa DSN MUI sebagai Legitimasi syariah atau pengakuan hukum pada tindakan kegiatan lembaga keuangan syariah membuat garis yang kontras dalam memandang uang dalam sistem ekonomi konvensional dan uang dalam tatan ekonomi islam. Metodologi yang digunakan untuk menelaah atau sebagai pisau analisis pada tulisan ini adalah studi kepustakaan atau studi literatur. Dimana studi literatur difokuskan pada artikel atau tulisan-tulisan yang telah ada sebelumnya. Berdasarkan hasil studi tersebut diperoleh kesimpulan bahwa Ekonomi Islam memandang bahwa uang hanya berfungsi sebagai alat tukar (medium of exchange) dan kesatuan hitung (unit of account) tidak sebagai komoditas. Uang tidak dapat diperjualbelikan dan dispekulasikan secara bebas. Dan uang tidak memiliki nilai waktu, tetapi waktulah yang memiliki nilai ekonomis (economic value of time). Dalam ekonomi islam keuntungan pada transaksi keungan didasarkan pada aspek bagi hasil berbeda dengan ekonomi konvensional yang berbasis bunga. Kata kunci: uang, nilai, bunga bank,
Social Media Da'wah Literacy on the West Java Saber Hoaks Program
Authors: Rosyidi Imron , Mukarom Zaenal , Jaelani Rif'at Fatkhurrohman
Published: September 2021

Hoax or false information is a problem and one of the impacts of the unwise use of social media. The spread of hoaxes on social media can potentially break the unity and trigger religious conflict. In response to these problems, West Java Saber Hoaks was formed to suppress and prevent the spread of hoaxes on social media. The purpose of this study is to reveal: (1) Jabar Saber Hoaks' efforts in preventing hoaxes; and (2) literacy of social media da'wah by Jabar Saber Hoaks. This study uses a case study method with a qualitative approach. Based on the study results, the following findings were obtained: (1) There were four efforts made by West Java Saber Hoaks to prevent hoaxes, namely opening a complaint service and monitoring content that has the potential to be a hoax, clarifying information, and providing literacy. (2) Social media da'wah literacy by West Java Saber Hoaks is carried out using preventive measures and information verification. From the results of this study, there are significant and recommendations, namely: (1) There is a need for mainstreaming social media literacy. (2) There is a need for preventive da'wah efforts on social media to ward off hoax information.Hoaks atau false information merupakan problematika dan salah satu dampak yang ditimbulkan dari penggunaan media sosial yang kurang bijak. Penyebaran hoaks di media sosial dapat berpotensi memecah persatuan dan memicu konflik keagamaan. Menyikapi persmasalahan tersebut, Jabar Saber Hoaks dibentuk untuk menekan dan menangkal penyebaran hoaks di media sosial. Tujuan dari studi ini ialah untuk mengungkap: (1) Upaya Jabar Saber Hoaks dalam menangkal hoaks; dan (2) Literasi dakwah media sosial oleh Jabar Saber Hoaks. Studi ini menggunakan metode studi kasus dengan pendekatan kualitatif. Berdasarkan hasil studi, didapatkan temuan berikut: (1) Ada empat upaya yang dilakukan Jabar Saber Hoaks dalam menangkal hoaks, yaitu membuka layanan aduan, memantau konten yang beprotensi hoaks, mengklarifikasi informasi dan memberikan literasi. (2) Literasi dakwah media sosial oleh Jabar Saber Hoaks dilakukan dengan cara upaya preventif dan verifikasi informasi. Dari hasil studi ini ada signifikasi dan rekomendasi, yaitu: (1) Perlu adanya mainstreaming literasi media sosial. (2) Perlu adanya uapaya dakwah preventif di media sosial untuk menangkal informasi hoaks.
PENGEMBANGAN MANAJEMEN SUMBER DAYA MANUSIA SEBAGAI SEBUAH KEUNGGULAN KOMPETITIF PADA INDUSTRI PARIWISATA DAN PERHOTELAN
Authors: Rihardi Eko Lianto
Published: September 2021

Pariwisata dan perhotelan merupakan industri yang sangat bergantung kepada sumber daya terutama sumber daya manusia. Berbagai studi ilmiah menunjukkan bahwa kualitas sumber daya manusia di perusahaan pariwisata dan perhotelan secara langsung mempengaruhi daya saing dan kelangsungan hidup perusahaan-perusahaan tersebut di pasar. Perhatian khusus dalam penelitian ini ditujukan pada analisis karakteristik spesifik sumber daya manusia di industri perhotelan dan pariwisata, dan terutama kualitas pekerjaan dalam kegiatan ini. Banyak penulis menunjukkan aspek negatif dari pekerjaan di bidang pariwisata, seperti upah rendah, jam kerja diperpanjang, volume kerja tinggi, pekerjaan jangka pendek dan paruh waktu karena sifat musiman pekerjaan, dll. Oleh karena itu, pariwisata dan hotel perusahaan menghadapi masalah dalam merekrut dan mempertahankan tenaga kerja berkualitas tinggi, yang juga bergantung pada daya saing mereka di pasar pariwisata. Untuk alasan ini, dalam industri pariwisata dan perhotelan, peningkatan perhatian diberikan pada manajemen kualitas sumber daya manusia.
PENGARUH STRES KERJA, KARAKTERISTIK INDIVIDU DAN KOMITMEN NORMATIF TERHADAP KINERJA KARYAWAN DI PT. EINS TREND FACTORY 2
Authors: Khalimah Nur , Amruloh Dedeng Abdul Gani
Published: September 2021

Penelitian ini bertujuan untuk mengetahui pengaruh stres kerja, karakteristik individu dan komitmen normatif terhadap kinerja karyawan pada PT. Eins Trend Factory 2 . Pada data yang dimiliki PT. Eins Trend Factory 2 terdapat informasi pencapaian kinerja yang kurang optimal, hal ini terlihat dari produksi yang tidak mencapai target produksi dan mengalami penurunan pencapaian target produksi setiap tahunnya. Metode yang digunakan dalam penelitian ini adalah kuantitatif dan pendekatan verifikatif dengan pengumpulan data melalui survei. Populasi dalam penelitian ini adalah karyawan yang bekerja di PT. Eins Trend Factory 2 sebanyak 83 responden, dengan nonprobability sampling dan teknik pengambilan sampel yang digunakan adalah purposive sampling. Analisis data dalam penelitian ini menggunakan analisis regresi linier berganda, uji t dan uji F dan uji determinasi. Hasil penelitian ini menunjukkan bahwa stres kerja berpengaruh negatif dan signifikan terhadap kinerja pegawai, variable karakteristik individu berpengaruh positif dan signifikan terhadap kinerja pegawai, sementara komitmen normatif berpengaruh positif dan signifikan terhadap kinerja pegawai, serta Stres kerja, karakteristik individu dan komitmen normatif berpengaruh positif dan signifikan terhadap kinerja pegawai.
Exposure of Barriers Used in Guided Bone Regeneration: Rate, Timing, Management, and Effect on Grafted Bone—A Retrospective Analysis
Authors: Poomprakobsri Kiddee , Kan Joseph Y. , Rungcharassaeng Kitichai , Lozada Jaime , Oyoyo Udochukwu
Published: September 2021

The purpose of this study is to compare the exposure rate of 3 different barrier types after a guided-bone regeneration procedure as well as to compare the percentage grafted bone dimensional loss with and without exposed barriers. Patient records from September 2007 to May 2015 were reviewed to identify subjects who had received a bone graft followed by implant placement procedure after the graft had completely healed. The subjects were divided into 3 groups: (1) resorbable barrier, (2) nonresorbable barrier, and (3) titanium-mesh barrier. Incidences of barrier exposure were recorded. Cone-beam computerized tomography images before treatment (T0), right after grafting (T1), and after healing (T2) were used to determine the percentage of grafted bone dimensional loss and am quantitative amount of grafted bone remaining (mm2). Three cross-sectioned areas, at 1-mm apart, of preplanned implant positions at the grafted site were measured using cone-beam computerized tomography to calculate the remaining grafted bone and grafted bone dimensional change. The exposure rate of all guided bone regeneration was 36.9%. The exposure rate of the resorbable barrier (23.3%) was significantly lower than titanium mesh (68.9%) and nonresorbable (72.7%; χ2, P < .001). The results of this study revealed that barrier types have a significant effect on the exposure rate. There was also a significant difference in grafted bone dimensional loss between sites with barrier exposure (58.3%) and sites with no barrier exposure (44.1%) during the healing period (Mann-Whitney U test, P = .008).
Intra- and Interexaminer Repeatability of Diagnostic Peri-Implant Clinical Measurement: A Pilot Study
Authors: Di Gianfilippo Riccardo , Askar Houssam , Henderson James , Franceschi Debora , Wang Hom-Lay , Wang Chin-Wei , Wang Jeff C. W.
Published: September 2021

Despite the crucial role of examiner reliability on quality research and practice, there is still limited literature analyzing factors affecting examiner variability of peri-implant clinical measurements. The present study investigated clinical peri-implant parameters to quantify their repeatability and investigate factors that may affect their accuracy. Thirty-three implants were examined by 4 operators. Peri-implant probing depth (PD), recession (REC), and gingival index (GI) were measured for agreement and included in the analysis. Agreement was quantified using intraclass correlation coefficients (ICCs; 95% confidence interval); mixed linear and logistic regressions were used to assess additional variables. The overall interexaminer agreement was comparable between PD (0.80) and REC (0.78) but significantly worse for GI (0.45; P < .001). Similarly, the intraexaminer agreement was similar for PD (0.81) and REC (0.80) but significantly worse for GI (0.57; P < .05). The magnitude of PD did not influence the agreement. In contrast, increasing disagreement was noted for positive REC (odds ratio [OR]: 3.0), negative REC (OR: 4.8), and lower GI (OR: 4.4). The incidence of bleeding on probing and severity of GI increased for deeper PD (0.113-unit increase per millimeter). Negative and positive values of recession and lower GI were associated with increasing disagreement. Radiographic bone loss, restoration contour, and implant diameter did not affect PD accuracy in this study. In conclusion, within the limitations of the study, GI measurements presented higher variability than PD and REC did. The PD and GI were associated with one another and increased after multiple measurements.
Pensamento Social no Brasil e os historiadores
Authors: Maia João Marcelo
Published: September 2021

Este artigo procura analisar a área de Pensamento Social no Brasil (PSB) à luz de suas aproximações e distanciamentos em relação ao campo da História. Sustenta-se a hipótese de que, a despeito da importância do trabalho de historiadores para a conformação dessa área, o PSB não se tornou um subcampo autônomo na disciplina, ao contrário do que ocorreu nas Ciências Sociais. O texto discute como a área foi marcada por uma interdisciplinaridade desigual que enfatizou a proximidade crescente com a sociologia. Tais resultados são brevemente cotejados com processos de consolidação de subáreas concorrentes no campo da História. Ao final, sugere-se uma aproximação contemporânea entre os historiadores e o PSB a partir de dois eixos: a) debates sobre intelectuais e arquivos; b) críticas a abordagens eurocêntricas e demandas por maior democratização de agendas de pesquisa.
Rituais da Mística: Fronteiras borradas entre política e religião
Authors: Chaves Christine de Alencar
Published: September 2021

Resumo Este estudo delineia os contornos da mística como categoria e prática social no Movimento dos Trabalhadores Sem-Terra/MST, explorando as implicações do singular enredamento ensejado entre religião e política. Ele expõe as confluências sociais e políticas que propiciaram essa figuração da mística, junto com excertos etnográficos que esboçam os significados e os usos da categoria no Movimento. A análise fundamenta-se numa interpretação histórico-etnográfica sobre o MST como fenômeno político e o papel que a criação de eventos, entendidos como rituais, nele desempenha. Acompanhar analiticamente as metamorfoses dessa categoria tipicamente religiosa e examinar suas características, conexões de sentido, usos sociais e implicações políticas amplia nosso entendimento de fenômenos congêneres e ilumina a importância política da religião na história brasileira recente.
Tinder: uma etnografia sobre encontros, socialidades e experimentações de si
Authors: Santos Sheila Cavalcante dos
Published: September 2021

Resumo Este artigo discute o percurso de busca e interação através do Tinder, aplicativo voltado à procura on-line por relacionamento íntimo. Com base em um estudo etnográfico acerca das experiências afetivo-sexuais de usuários e usuárias, serão enfocadas três dimensões neste percurso: como as pessoas se mostram (o perfil), como elas escolhem o outro (a seleção) e como começam a se relacionar on-line (a conversa). Através delas propõe-se observar especificidades do uso ligadas ao agenciamento tecnológico, à experimentação de si e aos vaivéns comunicacionais como traços marcantes da experiência possibilitada pelo aplicativo.
A Astronomia em currículos da formação inicial de professores de Física: uma análise diagnóstica Astronomy in curricula for the initial training of physics teachers: a diagnostic analysis
Authors: Slovinscki Luciano , Alves-Brito Alan , Massoni Neusa Teresinha
Published: September 2021

A presente pesquisa, de caráter descritivo-explicativa, apresenta um diagnóstico das Licenciaturas em Física no Brasil, examinando particularmente no tocante à presença de disciplinas de Astronomia nos seus currículos. O diagnóstico foi feito a partir da análise de informações sobre as Instituições de Ensino Superior (IES) e das matrizes curriculares das licenciaturas autorizadas pelo Ministério da Educação (MEC), e com base em dados sobre o quantitativo de licenciados em 2019 disponibilizados pelo Instituto Nacional de Estudos e Pesquisas Educacionais Anísio Teixeira (INEP). Classificamos as IES quanto ao tipo de administração e à região onde estão localizadas; os cursos, segundo a modalidade de ensino e quanto à presença de disciplinas relacionadas à Astronomia; e também quanto ao acesso a tais disciplinas pelos professores que concluíram sua formação em 2019. As informações foram comparadas, organizadas e relacionadas de forma a tentar estimar o percentual de profissionais formados em 2019 que tiveram acesso a disciplinas de Astronomia em sua formação inicial. Os resultados mostram que, neste recorte, cada IES formou, em média, menos de dez professores por curso, com os maiores índices de formação sendo observados nas IES privadas da região Sudeste, e os menores nas IES Estaduais da região Norte. A análise mostra que um número reduzido de Licenciaturas em Física no nosso país oferece disciplinas de Astronomia em sua arquitetura curricular. A região Sul possui a maior oferta de disciplinas de Astronomia, mas isso tem pouco impacto no cenário nacional, pois a região responde por apenas 15% dos professores formados no País, ao passo que as demais regiões destacam-se mais pela não oferta de tais cursos. Com relação às IES, o melhor cenário é observado nos Institutos Federais de Educação, Ciência e Tecnologia (IF) e o mais preocupante, nas IES privadas. Ao final comentamos sobre a importância de uma revisão nos currículos dos cursos de formação de professores de Física, prevendo a inclusão de disciplinas de Astronomia como forma de torná-los mais atraentes aos futuros professores, e a fim de diminuir a evasão escolar e o déficit de professores no Brasil.