bluuebunny/crossref_metadata_2025 huggingface dataset:
Atomistic insights into the mechanical anisotropy and fragility of monolayer fullerene networks using quantum mechanical calculations and machine-learning molecular dynamics simulations
Authors: Ying Penghua , Dong Haikuan , Liang Ting , Fan Zheyong , Zhong Zheng , Zhang Jin
Published: September 2022

In this work, we comprehensively study the mechanical properties of the newly synthesised monolayer quasi-hexagonal-phase fullerene (qHPF) membrane [Nature \textbf{606}, 507-510 (2022)] under uniaxial tension by using quantum mechanical density-functional-theory (DFT) calculations and molecular dynamics (MD) simulations with a machine-learned neuroevolution potential (NEP). The elastic properties and fracture behaviours of monolayer qHPF are found to be strongly anisotropic due to the different properties between the inter-fullerene C-C single bonds and [2 + 2] cycloaddition bonds. Moreover, the tensile strength and fracture strain of monolayer qHPF are much smaller than those of any other existing two-dimensional (2D) carbon crystals. The very small tensile strength or fracture strain is ascribed to the inhomogeneous deformation of the stretched monolayer qHPF, which originates from the stiffness difference between the soft inter-fullerene bonds and the rigid intra-fullerene bonds. Compared with DFT calculations at the ground state, the NEP-based extensive MD simulations predict a much smaller tensile strength and fracture strain for monolayer qHPF due to their consideration of the effects of temperature and membrane size. Our work not only reveals the underlying mechanism of the fracture behaviours of monolayer fullerene networks from an atomistic perspective, but also shows the effectiveness and accuracy of the NEP approach in determining the mechanical properties of 2D materials in the realistic situations.
AFM manipulation of EGaIn microdroplets to generate controlled, on-demand contacts on molecular self-assembled monolayers
Authors: Soh Eugene Jia Hao , Astier Hippolyte P.A.G. , Daniel Dan , Chua Jia Qing Isaiah , Miserez Ali , Jia Zian , Li Ling , O' Shea Sean J. , Bhaskaran Harish , Tomczak Nikodem , Nijhuis Christian A.
Published: September 2022

Liquid metal droplets, such as eutectic Gallium-Indium (EGaIn), are important in many research areas, such as soft electronics, catalysis, and energy storage. Droplet contact on solid surfaces is typically achieved without control over the applied force and without optimizing the wetting properties in different environments (e.g., in air or liquid), resulting in poorly defined contact areas. In this work, we demonstrate the direct manipulation of EGaIn microdroplets using an atomic force microscope (AFM) to generate repeated, on-demand making and breaking of contact on self-assembled monolayers (SAMs) of alkanethiols. The nanoscale positional control and feedback loop in an AFM allow us to control the contact force at the nanonewton levels and, consequently, tune the droplet contact areas at the micrometer length scale in both air and ethanol. When submerged in ethanol, the droplets are highly non-wetting, resulting in hysteresis-free contact forces and minimal adhesion; as a result, we are able to create reproducible geometric contact areas of between 0.8–4.5 μm2 with the alkanethiolate SAMs in ethanol. In contrast, there is a larger hysteresis in the contact forces and larger adhesion for the same EGaIn droplet in air, which reduced the control over the contact area (4–12 μm2). We demonstrate the usefulness of the technique and of the gained insights in EGaIn contact mechanics by making well-defined molecular tunnelling junctions based on alkanethiolate SAMs with small geometric contact areas of between 4 and 12 μm2 in air, one to two orders of magnitude smaller than previously achieved.
The most compact search space is not always the most efficient: A case study on maximizing solid rocket fuel packing fraction via constrained Bayesian optimization
Authors: Baird Sterling , Hall Jason R. , Sparks Taylor D.
Published: September 2022

Would you rather search for a line inside a cube or a point inside a square? This type of solution degeneracy often exists in physics-based simulations and wet-lab experiments, but constraining these degeneracies is often unsupported or difficult to implement in many optimization packages, requiring additional time and expertise. So, are the possible improvements in efficiency worth the cost of implementation? We demonstrate that the compactness of a search space (to what extent and how degenerate solutions and non-solutions are removed) can significantly affect Bayesian optimization search efficiency via the Ax platform. We use a physics-based particle packing simulation with seven to nine tunable parameters, depending on the search space compactness, that represent three truncated, discrete log-normal distributions of particle sizes. This physics-based simulation exhibits three qualitatively different degeneracy types: size-invariance, compositional-invariance, and permutation-invariance. We assess a total of eight search space types which range from none up to all three constraint types imposed simultaneously. We find that leaving the search space unconstrained leads to a large variance in the outcome and that on average, the most constrained search space is not always the most efficient. Likewise, the least constrained search space is not always the least efficient. We recommend that optimization practitioners in the physical sciences carefully consider the impact of removing search space degeneracies on search efficiency before running expensive optimization campaigns.
Extraction of flavonoids from Spatholobus suberectus with deep eutectic solvent
Authors: Li Long , Zheng Yanying , Wang Yongqi , Wang Yiyi
Published: September 2022

In this study, deep eutectic solvents were used for the extraction of flavonoids from Spatholobus suberectus. The extraction effect was measured using UV spectrophotometer and found that the deep eutectic solvent consisting of choline chloride and triethylene glycol (1:2) was the best extraction. The solvent water content (%), liquid-to-material ratio (v/m), and extraction temperature (K) were optimized using the central composite bounded design response surface method in a single-factor experiment. The results showed that the extraction yield of chickweed flavonoids reached 96.01 (mg/g) at a liquid-to-material ratio of 39:1, a water content of 43% in DESs and an extraction temperature of 336.6 K for 5 min, which was 2.85 and 4.12 times higher than that of the control group (90 min extraction) using 60% ethanol and water, respectively. The antioxidant activity of the extracts was evaluated using 2,2-Diphenyl-1-(2,4,6-trinitrophenyl)hydrazin-1-yl (DPPH) and it was found that the extracts inhibited DPPH by 89.765%, indicating the high content of flavonoids extracted. This study provides an idea for the extraction of functional components of biological origin.
Mitochondrial stress-induced GFRAL signaling controls diurnal food intake and anxiety-like behavior
Authors: Igual Gil Carla , Coull Bethany M , Jonas Wenke , Lippert Rachel N , Klaus Susanne , Ost Mario
Published: September 2022

Growth differentiation factor 15 (GDF15) is a mitochondrial stress-induced cytokine that modulates energy balance in an endocrine manner. However, the importance of its brainstem-restricted receptor GDNF family receptor alpha-like (GFRAL) to mediate endocrine GDF15 signaling to the brain upon mitochondrial dysfunction is still unknown. Using a mouse model with muscle-specific mitochondrial dysfunction, we here show that GFRAL is required for activation of systemic energy metabolism via daytime-restricted anorexia but not responsible for muscle wasting. We further find that muscle mitochondrial stress response involves a GFRAL-dependent induction of hypothalamic corticotropin-releasing hormone, without elevated corticosterone levels. Finally, we identify that GFRAL signaling governs an anxiety-like behavior in male mice with muscle mitochondrial dysfunction, with females showing a less robust GFRAL-dependent anxiety-like phenotype. Together, we here provide novel evidence of a mitochondrial stress-induced muscle–brain crosstalk via the GDF15-GFRAL axis to modulate food intake and anxiogenic behavior.
Do Public Pension Obligations Affect State Funding Costs?
Authors: Burson Jean M. , Carlson John B. , Ergungor O. Emre , Waiwood Patricia
Published: September 2022

States' unfunded pension obligations to their current and retired employees have exploded in recent years to levels that are estimated to be between $750 billion and $4.4 trillion. In theory, this massive debt should have implications for states' ability to meet their financial obligations and a measurable impact on funding costs. Yet we find limited evidence that municipal bond markets are pricing the risks to states' fiscal health arising from these large obligations.
Nano ZNO and surface modification ZNO with graphite oxide deposition to enhance the catalytic activity
Authors: Reddy K. M. , Anmol Chhoker , Aditya Sharma
Published: September 2022

Preparation of ZnO nanoparticles and surface modification ZnO with the carbon material graphite oxide, were synthesized. The synthesized materials were characterized by PXRD, FT-IR, and UV-visible analysis. The materials show better optical and structural properties, which are beneficial in the photocatalytic degradation studies. Under light, zinc oxide and graphite oxide were used to degrade the methyl orange solution. The prepared materials by sol-gel preparation showed enhanced catalytic activity in the photocatalytic activity of methyl orange. An optimal loading content of graphite oxide was investigated. The enhanced photocatalysis was studied in detail. The study provides a promising application for the photocatalytic degradation of organic pollutants in photocatalysis. In the present work, the authors included the new novel materials of ZnO. The ZnO is modified with the surface deposits of rGO. The combined materials of semiconductor materials show a better response to light for the degradation studies. The use of such a combination is a new study and the results reflect the modification of semiconductor materials in the p-block elements such as C, N, F, P and so on for the enhanced photocatalytic applications of semiconductor mediated materials, which are widely used in photocatalysis. The PXRD analysis of ZnO and rGO shows better crystallinity in the case of ZnO, whereas after the deposition of rGO, crystallinity is lost due to the overlap of the main base material semiconductors, which explains the new catalytic and recombination effects of the materials used.
Rusya-Ukrayna Savaşının Türk Turizmine Yansımaları Reflections of the Russia-Ukraine War on Turkish Tourism
Authors: Sezen Doğancılı Olca
Published: September 2022

Turizm sektörü doğal afet, terör, siyaset, güvenlik gibi birçok iç ve dış etkenlerden etkilenen kırılgan bir yapıya sahiptir. 2019 yılında dünya çapında yaşanan Covid 19 pandemisinin olumsuz etkileriyle boğuşan turizm sektöründe, 24 Şubat 2022’de başlayan Rusya ile Ukrayna savaşı ile büyük soru işaretleri oluşmaya başlamıştır. Her iki ülkenin de Türkiye’ye en fazla turist gönderen ülkelerden olmasından dolayı 2022 yılı turizm sezonuna ilişkin belirsizlikler yaşanmaktadır. Bu kapsamda yerel ve ulusal dijital medyada yer alan yazılı haber içerikleri incelenerek 2022 yaz dönemine ilişkin öngörülerin ortaya konulması amaçlanan çalışmada 119 haber ve 671 haber ifadesi incelenerek mevcut durum analiz edilmiştir. Elde edilen verilere göre Şubat ayında “talep düşüşü, umut, endişe”; Mart ayında “talep azlığı, alternatif turizm, gelir kaybı” ve Nisan ayında “Covid, alternatif pazar, MİR” ifadeleri görülmüştür. Ödeme kolaylıkları, alternatif ödeme seçenekleri ve alternatif pazar oluşturmak gibi ifadeler de çözüm yöntemleri olarak saptanmıştır. Bu veriler ışığında Covid pandemisinin etkisini giderememiş olan turizm sektörünün, Rusya Ukrayna savaşının yıkıcı etkisini hissetmemesi için yerli turistler ile yabancı alternatif pazarlara tanıtım ve pazarlama faaliyetlerinin geliştirilmesi önerilmektedir.
幼儿园表演游戏开展中存在的瓶颈及改善
Authors: 毛丽 邵
Published: September 2022

随着教育事业的发展进步，幼儿园教育受到了普遍重视。幼儿园教育教学过程中，游戏教学能够和幼儿身心健康发展充分匹配。但是就目前而言，大部分表演游戏活动并不能实现教育目标，主要是因为表演游戏内容以及相关准备工作并不能使幼儿教育需求获得充分满足，因此本文分析了其中存在的问题并对教学模式进行优化完善。
原生家庭影响下的一次学生突发心理危机事件处置
Authors: 袁慧 杨 , 庆 吴 , 菊玲 张
Published: September 2022

原生家庭对大学生的心理发展有着深远的影响，常常引起学生的突发心理危机事件发生。本文围绕高校辅导员工作案例展开分析，详细阐述危机事件的应急处置过程，要做到迅速响应、现场处置，持续关心、真情陪伴，循序渐进、专业指导，风险评估、家校共育，最后进行工作的总结与分析，建立原生家庭影响下的学生突发心理危机处置机制，为今后的工作奠定基础、积累经验，做好学生成长的知心人、热心人和引路人，尽心尽责，围绕学生、关照学生，用大爱呵护学生成长。
“立德树人”理念下新时代思政辅导员历史使命感现状及其 提升对策研究
Authors: 雪 常
Published: September 2022

拥有崇高的历史使命感是思政辅导员工作的本源支撑，可以为针对学生的思想政治教育工作增添诸多内涵和深意。现阶段中国许多学者都已经广泛地认识到思政辅导员的历史使命感的重要作用和价值，但是因为缺乏相互对照的理论研究和实践探索，所以导致对思政辅导员的历史使命感的培养仍然面临着部分问题。在立德树人理念持续深入应用的时代背景下，思政辅导员如何更好地确定未来的工作方向和进程成为需要予以重点关注和认识的问题，结合目前已有情况来看，深度分析思政辅导员的历史使命感具有极为重要的理论意义和现实价值，本文将会以此为前提条件寻找立德树人理念下新时代应该如何着重促进思政辅导员的历史使命感的增长和提高。
Supervisory Performance of Cooperative Teachers in Improving the Professional Preparation of Student Teachers
Authors: Al-Barakat Ali Ahmad , Al Ali Rommel Mahmoud , Al-Hassan Mu’aweya Mohammad , Al-Hassan Omayya M.
Published: September 2022

The purpose of this study was to investigate the degree of effectiveness of the supervisory performance of cooperative teachers in improving the professional preparation of student teachers in the specialization of early childhood education.The participants were 155 student teachers enrolled in the education field-training program at Yarmouk University in Jordan. To achieve the purpose of the study, a questionnaire was developed, after insuring its validity and reliability. The findings showed that, according to the means and standard deviations of the questionnaire items, cooperative teachers did not fulfill their supervisory roles in improving the professional preparation of student teachers during the education field-training. The findings also showed that there were no statistically significant differences in the effectiveness of the supervisory performance of cooperative teachers due to gender, academic qualification and teaching experience. This indicates that these variables do not affect the cooperative teachers' supervisory role in improving student teachers' preparation. This study contributes to a better comprehension of the supervisory performance of cooperative teachers in improving the professional preparation of student teachers. It is suggested that the teacher education program at Yarmouk University should pay attention to improve student teachers' preparation during the education field-training phase.
Manual práctico de enfermería quirúrgica
Authors: Chacha Uto David Gustavo , Villavicencio Guerrero Irvin Javier , Calle López Dayana Estefanía , Gualco Centeno Darwin Javier , Yapud Pantoja Luis Fernando , García Vega Jefferson Benito , Arcos Bonilla Violeta Jessenia , Ayala Estrella María Augusta , Lema Acosta Grace Verónica , Velasco Reyes Carlos Eduardo
Published: September 2022

El libro, MANUAL PRÁCTICO DE ENFERMERÍA QUIRÚRGICA, que tiene hoy usted en sus manos, se enmarca en la rama de la enfermería que atiende a los pacientes durante intervenciones quirúrgicas, respaldando el trabajo de especialistas como cirujanos y anestesiólogos, la cual no es otras que la Enfermería Medico Quirúrgica, entendida en su sentido más estricto. El texto ha sido diseñado como una herramienta útil y eficaz de actuación necesaria para estudiantes y el conjunto de profesionales de enfermería quienes día a día realizan su actividad en el área quirúrgica con el objetivo de servir de ayuda a los mismos, como documento de consulta y formación contribuyendo a que la atención a los pacientes sea cada día de más calidad. En este sentido, se centra en el abordaje de los cuidados o atención de enfermería, los cuales son fundamentalmente el conjunto de acciones intencionadas que el profesional de enfermería realiza en un orden específico con el fin de asegurar que una persona o un grupo de personas reciban el mejor cuidado posible por parte de éstos y en este caso específico, de los cuidados del paciente dentro en las diversas fases del proceso quirúrgico: el preoperatorio, el transoperatorio y el posoperatorio, etapas donde el profesional de enfermería tiene responsabilidades y funciones específicas y variadas, aunque la mayoría se concentran en el cuidado del paciente, la asistencia a otros profesionales, la higiene del instrumental quirúrgico y equipos. Dos aspectos son importantes indicar ante la lectura del libro, en primer lugar que cada procedimiento quirúrgico, cada procedimiento anestésico y cada paciente requieren unos cuidados de enfermería específicos e individualizados, atendiendo a ello, se invita a la consulta del mismo conociendo que éste no es un tratado completo de enfermería quirúrgica y, por tanto la información puede ser complementada con otros estudios y la práctica, y, en segundo lugar tener siempre presente que la enfermera /o en el área quirúrgica forma parte de un equipo multidisciplinar y su labor es tan relevante como la del cirujano y el anestesista.
Números racionais e os documentos norteadores: o que nos mostram os livros do PNLD no período de 1980 – 2020
Authors: Iora Maisa , Noguti Fabiane Cristina Höpner
Published: September 2022

Este trabalho é um recorte de uma dissertação de mestrado que foi realizada com base na pesquisa qualitativa e exploratória e que teve como objeto de estudo o Conjunto dos Números Racionais e suas diferentes personalidades. Com o intuito de melhor conhecer a trajetória desse conjunto e a forma como ele é exposto nos livros direcionados à Educação Básica pelo Plano Nacional do Livro e do Material Didático – PNLD, apresenta-se uma análise dos exemplares que abordam tal tema da coleção A Conquista da Matemática durante o período de 1980-2020. Nesse sentido, considerou-se o que os documentos oficiais de cada época apontaram em relação ao tema, a saber, as Propostas Curriculares Oficiais, os Parâmetros Curriculares Nacionais (PCN) e a Base Nacional Comum Curricular (BNCC). Com essa análise foi possível perceber que a coleção passou por modificações significativas em cada alteração de documentos norteadores, porém, coleções de décadas diferentes, mas de mesma orientação curricular mantiveram as mesmas características.
Relato de experiência e investigação de aplicação de um personagem fictício como método na aprendizagem de Anatomia Humana
Authors: Freitas Emília Cristina Benevides de , Spiegel Carolina Nascimento
Published: September 2022

O ensino de Anatomia demanda estratégias que estimulem o interesse dos alunos, fugindo da memorização e oferecendo um ensino contextualizado. Este trabalho relata a experiência da criação e uso de uma persona, como estratégia pedagógica, em um ambiente híbrido de ensino. Os dados foram gerados por meio de observação participante, pelas postagens nas redes sociais e dois questionários. Procedeu-se a Análise de Conteúdo por categorização e por meio da Escala de Likert. O uso da persona contribuiu na formação dos licenciandos em Educação Física, sobretudo devido à ludicidade, aumentando a participação nas atividades, a motivação, o engajamento e o interesse em aprender, assim como gerou um sentimento de pertencimento em relação à disciplina. Em síntese, o uso de uma persona foi bem aceito pelos alunos e pode ser adaptado para qualquer disciplina, desde que se construa a persona com as características dos alunos que cursam a disciplina em questão.
Construção de conhecimentos docentes para o ensino da Trigonometria: perspectivas e desafios na formação inicial
Authors: Sousa Maria Izabel Barbosa de , Farias Sidilene Aquino de
Published: September 2022

Frente às limitações teórico-metodológicas dos educadores de Matemática ao lecionarem conteúdos trigonométricos, este trabalho pretende analisar como os cursos de formação inicial de professores de Matemática de Instituições de Educação Superior (IES) públicas, localizadas na Região Norte do Brasil, estão contribuindo na construção de conhecimentos docentes para o ensino da Trigonometria na Educação Básica. Mediante a Pesquisa Qualitativa, considerou-se a participação de licenciandos em Matemática de três IES do município de Manaus-AM. A coleta de dados ocorreu virtualmente, com a aplicação de questionário e realização de entrevista semiestruturada, cujos dados foram analisados conforme a Análise Textual Discursiva. Os resultados indicam que tais cursos estão corroborando na mobilização de um repertório de conhecimentos profissionais para a abordagem da Trigonometria na prática educativa. Entretanto, os acadêmicos sublinharam uma impressão de despreparo didático-pedagógico e a ausência de equilíbrio e coerência entre as disciplinas específicas e pedagógicas que introduzem esse objeto em suas propostas.
Contribuições da Neurociência para a formação docente em ciências: uma revisão sistemática integrativa de literatura
Authors: Freitas Priscila dos Santos Caetano de , Sousa Carlos Eduardo Batista de
Published: September 2022

A inserção de conhecimento neurocientífico na educação pode contribuir para o desenvolvimento de estratégias de ensino que visam melhorias na aprendizagem. O presente estudo realizou um levantamento bibliográfico, por meio do método de revisão sistemática integrativa de literatura, buscando identificar a relação entre neurociência e o ensino de ciências, com foco na formação de professores de ciências. Resultados iniciais em publicações indexadas nas bases de dados da Scielo, Scopus e Google Acadêmico, compreendidas entre 2009 a julho de 2020, surgiram a partir dos termos descritores “neuroscience” e “teaching Science”. Trinta publicações foram incluídas e agrupadas em quatro categorias de análise: estratégias de ensino, revisão de literatura, neurociências e formação de professores e contribuições da neurociência na educação. Dos 377.445 resultados encontrados, apenas 0,5% corresponde a publicações brasileiras, o que aponta que os estudos a respeito da neuroeducação no país ainda são incipientes, não obstante a sua relevância para a educação.
A interdisciplinaridade nos documentos oficiais que orientam a formação inicial docente em Ciências da Natureza na Universidade Federal de Goiás
Authors: Alonso Luri Braga , Souza Cleyton Ferreira de , Vilela Marcos Vinícius Ferreira
Published: September 2022

A interdisciplinaridade tem sido um tema recorrente no campo da educação, trazendo repercussões na formação inicial docente em Ciências da Natureza. Diante da ampla utilização no contexto educacional, é comum encontrarmos, nos documentos educacionais oficiais, diversos sentidos atribuídos ao termo interdisciplinaridade. Nesse sentido, o objetivo deste trabalho é compreender de que forma a interdisciplinaridade se apresenta nos documentos de abrangência nacional e institucional, os quais orientam a formação de professores para os campos disciplinares das Ciências da Natureza na Universidade Federal de Goiás. Foi realizada uma pesquisa qualitativa, com base nos pressupostos teórico-metodológicos da pesquisa documental. Para a análise dos dados, foi utilizada a Análise de Conteúdo de Bardin. Como resultado, pôde-se aduzir que os documentos orientadores refletem a polissemia do termo interdisciplinaridade e que não há sistematização conceitual do termo. Também não estão claros quais são os meios para que a interdisciplinaridade ocorra na formação inicial de professores.
ENHANCING PARAMETERS OF COMFORTABLE ANIMAL KEEPING ON A LIVESTOCK FARM TO ENSURE INTENSIFIED MILK PRODUCTION
Authors:   Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, PAVKIN DMITRIY YU.
Published: September 2022

Comfortable keeping of animals directly affects their productivity. The authors analyzed the parameters of comfort for animals in loose housing: ambient temperature, relative humidity in the barn, stall bedding and standards for arranging passageways, feeding and watering areas. Studies have shown that the comfortable keeping of animals requires a number of parameters: temperature in the barn within 0… + 12°C; sufficient space – at least 30 cub. m of space per animal; the box width of about 1.10…1.20 m; air exchange rates in winter of 4..5, in summer – of up to 20…30; stall bedding – sand or a rubber filling mattress. The optimal temperature and humidity index for adult cattle should be at least 68. To comply with all technological standards for the comfortable keeping of animals, the authors suggest using unified fasteners to adjust the width of the stall space to the required distance depending on the cow’s body weight, set the overhead bar to ensure a convenient animal position, and change the location of the chest board. Compliance with the basic parameters of animal keeping and a possibility of adjusting the dividers f or boxes make comfortable conditions for the animal to lie down and chew food longer, which contributes to an increase in the milk yield.
INCREASING THE EFFICIENCY OF THE PNEUMATIC SEPARATING DEVICE OF A GRAIN PRE-CLEANER
Authors:   Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, BURKOV ALEKSANDR I.
Published: September 2022

An increase in the productivity of pneumatic systems of grain cleaners is achieved by increasing the size and number of pneumatic separating channels. But as the channel depth increases, the non-uniformity of the air flow velocity field in the separation zone increases too, and an uneven air flow is formed in the outlet of the pneumatic separating channel, due to the action of centrifugal forces, which negatively affects the quality of grain cleaning. The purpose of the study is to improve the quality of grain material cleaning with an air-separating device of a grain pre-cleaner by equalizing the air flow in the upper part and the front part of the air-separating channel outlet by installing a guide vane in the outlet and optimizing its parameters. The authors measured the air flow rates in the pneumatic separating channel and its outlet in the idle mode at the laboratory installation of the pneumatic system of a grain pre-cleaner, as well as analyzed the cleaning of the artificially prepared grain mixture with a moisture content of 14%, consisting of barley grain of the Zazersky variety (95%) and light impurities (5%). The specific supply of grain material to the pneumoseparating channel corresponded to 7.94 kg/(s·m), the loss of valuable grain to waste was 0.05%. As a result of an aerodynamic study of the pneumatic separating channel outlet without a guide vane, a significant non-uniformity of the air flow was established in its initial section: the coefficient of air velocity variation along the channel depth amounted to 0.29, which exceeds the target values (0.20…0.25). Installing a guide vane with optimal parameters contributes to the alignment of the air flow in the upper part of the channel and the front part of its outlet, which has a positive effect on pneumoseparation. With the vane radius of 0.20 m, an angle of its arc of 80°, depths of the inlet and outlet sections of the inner part of the outlet of 0.105 and 0.066 m, respectively, the cleaning effect of the grain material from light impurities increases by 6.6% (from 61.2 to 67.8%).
EVALUATION OF THE EFFECTIVENESS OF COMBINING CORN CULTIVATOR WORKING TOOLS
Authors:   Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, MAZUR VLADIMIR V.
Published: September 2022

When cultivating corn, large farm holdings use a wide range of various modern herbicides to control weeds. For many small farms, herbicidal weeding of crops is practically impossible due to expensive inputs. To minimize corn production costs, the author analyzed the effectiveness of combining cultivator working tools for row-to-row processing of corn crops. The experiment was conducted in the Tambovka district of the Amur region. A “Bereginya” seeder was used to sow medium-ripened Falcon maize (hybrid). The seeding rate was 80…90 thousand germinating grains per 1 ha. The seeding depth was 4…6 cm. The cultivation operations involved pre-emergence harrowing and cultivation. To combat weeds and loosen the soil, two inter-row treatments were carried out during the phase of the first- and fifth-leaf formation. The experiment included four combinations of cultivator working tools: flat hoes (blades), universal center hoes, chisel-shaped hoes and hoe wheels. A variant with the use of a herbicide mix was adopted as the standard. The tillage depth with one-sided flat hoes (blades) was 6…8 cm, with universal center hoes – 10…12 cm, with chisel-shaped hoes – 15…20 cm, with hoe whells – 8…10 cm. It was experimentally established that the use of a herbicide mix contributed to obtaining the highest corn yield of 3.87 t/ha. Mechanical weeding of row spacing using two universal center hoes with a chisel-shaped hoe and hoe wheels or two one-sided flat hoes with a center hoe made it possible to obtain yields of 3.39 and 3.38 t /ha, respectively, and increase the profitability of corn production by 3.8…38.6% as compared with the use of a herbicide mix. The study has proved the effectiveness of combining cultivator working tools in inter-row cultivation of corn crops.
ANALYSIS OF THE PROBLEMS OF ASSESSING OCCUPATIONAL RISKS ASSOCIATED WITH AN INCREASE IN THE SHARE OF ELDERLY TRACTOR DRIVERS ENGAGED IN AGRICULTURE
Authors:   Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, SHIROKOV YURIY А.
Published: September 2022

Due to the change in the retirement age and the increase in the proportion of elderly tractor drivers in agricultural enterprises, it became possible to increase the number of emergencies and accidents in the field. The methodological basis of the research was the study and analysis of changes in human cognitive abilities with the increasing age (decreased attention, memory, and performance) and operating environment factors of tractor drivers that affect their fatigue and performance. It has been established that the risks of increased number of emergencies and accidents may grow due to natural biological processes occurring in the body of most people after reaching the age of 60. The age-related decline in attention, memory, decision-making speed, and efficiency of elderly tractor drivers can be aggravated by the presence of harmful production factors in the workplace. At the same time, over many years of work in unfavorable sanitary and hygienic conditions, the risks of occupational diseases may also increase. The author draws conclusions about the need for agricultural managers to adjust the system of both assessing occupational risks and managing the health and safety of elderly tractor drivers. It is advisable for the labor protection services of agricultural enterprises to develop and implement a system for managing the risks of overwork, organizing fatigue preventive measures for elderly tractor drivers and, accordingly, the probability of various incidents and accidents. It is necessary to conduct research on the combined effect of microclimate and noise parameters on the fatigue, reaction speed, and attentiveness of elderly tractor drivers to develop requirements for their work and rest modes and clarify the requirements for the arrangement of tractor cabs and mobile agricultural machines.
TECHNOLOGICAL PROCESSES OF OBTAINING FUNCTIONAL COATINGS BY ELECTRICAL CONTACT WELDING. PART 1
Authors:   Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, SEROV ANTON V.
Published: September 2022

Further development of mechanical engineering requires new and improved existing technologies, including hardening and restoration of parts, as well as technologies for obtaining functional coatings. Electrical contact welding is an effective method of obtaining functional coatings on the working surfaces of parts for various purposes. The article considers technological capabilities, the experience of using various materials, hardness and wear resistance of coatings obtained during with electrocontact welding. The authors consider the main technological equipment and make recommendations on choosing the suitale tools. The article presents a classification of the processes of obtaining functional coatings by electrocontact welding, taking into account their physical and technological features. Based on this classification, one can make a rational choice of the kind and type of equipment to be used, the process algorithm, the filler materials, as well as the means of process intensification based on the needs and capabilities of a particular production process.
AGRICULTURAL STAFF TRAINING IN THE SYSTEM OF LIFELONG PROFESSIONAL EDUCATION
Authors:   Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, KUBRUSHKO PETR F.
Published: September 2022

The agro-industrial sector is currently experiencing a shortage of personnel. Despite the fact that agriculture has radically changed in terms of technologies and methods of production, many people still consider farm-related jobs tedious, consumptive, monotonous, and thus unattractive. Unmotivated schoolchildren with low USE scores often enter agricultural universities. “Agroclasses” is one of the career guidance areas aimed at motivating schoolchildren and forming their readiness for a conscious choice of an agricultural profession. The propaedeutic stage of professional self-determination of schoolchildren is important not only for higher education, but also for secondary vocational education and training (SVET). The SVET objectives are not limited to the training of qualified workers and mid-level specialists. The authors also proved the relevance of the career development trajectory "college-higher education (secondary and tertiary professional training programs)" associated with the problem of teaching content continuity, including "shortened" university curricula. This goal requires modernization of the list of academic curricula of agrarian universities. The competitiveness of higher agrarian education at the stage of technological development “AgroTech 4.0” depends on the implementation of the principles of continuity and succession of professional education through the introduction of flexible module-based inter-disciplinary programs.
Pressure and pressure derivative analysis for a well in a radial composite reservoir with a non-newtonian/newtonian interface
Authors: Escobar Freddy-Humberto , Martínez Javier-Andrés , Montealegre-Madero Matilde
Published: September 2022

In many activities of the oil industry, engineers have to deal with completion and stimulation treatment fluids such as polymer solutions and some heavy crude oils which obey a non-Newtonian power-law behavior. When it is required to conduct a treatment with a non-Newtonian fluid in an oil-bearing formation, thiscomes in contact with conventional oil which possesses a Newtonian nature. This implies the definition of two media with entirely different mobilities. If a pressure test is run in such a system, the interpretation of data from such a test through the use of conventional straight-line method may be erroneous and may not provide a way for verification of the results obtained.

In this work, the signature of the pressure derivative curve is investigated to understand and ease the interpretation of the well test data in reservoirs with non-Newtonian power-law fluids. Specifically, the Tiab’s Direct Synthesis (TDS) technique is implemented using some characteristics features found on the pressure and pressure derivative curves. Hence, new equations are introduced to estimate permeability, non-Newtonian bank radius and skin factor. Permeability can be verified. The proposed methodology was successfully verified by its application to an example reported in the literature and a synthetic case.
Modified design for vacuum residue processing
Authors: González Sandro-Faruc , Carrillo Jesus , Núñez Manuel , Hoyos Luis-Javier , Giraldo Sonia-A.
Published: September 2022

The world petroleum industry shows a decreasing in the oil reserves, specially the light kind. For this reason is very important to implement process schemes that give the possibility to improve the recuperation of valuable products of heavy oil. In this case the bottom processing in each one of the petroleum refining stages earns great importance with the purpose of maximizing the quantity of fuel by barrel of raw processed. Therefore, it has been proposed the modification of the currently vacuum residues process scheme in the Ecopetrol`s Barrancabermeja refinery (DEMEX-Visbreaking-Hydroprocessing). That modification consists in the incorporation of an additional Visbreaking stage, previous at DEMEX extraction stage.

This investigation was developed with plant pilot tests combined with statistical models that predict the yield and the quality of the products obtained in the industrial plants. These models were developed by the Instituto Colombiano de Petróleo (ICP).

The modified scheme Visbreaking I-DEMEX- Visbreaking II- Hydroprocessing, gives the possibility to increase the yield of middle distillates. Besides decrease the quantity of demetalized oil produced in DEMEX stage. This reduction is very favorable since environmental point of view, because it allows have a percentage of free capacity in the Hydroprocessing unit in order to removed sulfur of valuable products like Diesel and in this way to respect the environment law to this kind of fuel.
Separation of fractions from vacuum residue by supercritical extraction
Authors: Parra Martha Josefina , León Adan Yovani , Hoyos Luis Javier
Published: September 2022

The Instituto Colombiano del Petróleo (ICP), has implemented a methodology for separating vacuum residue fractions using the technique of supercritical fluid extraction at the pilot scale. The present study evaluates the efficiency of extraction of fractions of a typical vacuum residue in the Barrancabermeja refinery. The extraction test was carried out with n-hexane under supercritical conditions of temperature and pressure of the 265ºC in the range from 450 to 1250 psi, respectively. Finally, each of the fractions were analyzed for their density, viscosity, sulfur content, Conradson Carbon Residue (CCR) content, SARA com-positional analysis, and metals.
Determination of molecular weight of vacuum residue and their SARA fractions
Authors: León Adan Yovani , Parra Martha Josefina
Published: September 2022

The molecular weight of a number of vacuum residue and their SARA fractions (Saturated, Aromatics, Resins, and Asphaltenes) typical of the Barrancabermeja refinery in Colombia were determined using the following methods: Gel Permeation Chromatography (GPC), Vapor Pressure Osmometry, (VPO), and Simulated Distillation at High Temperature adjusted to the Gamma distribution function. Molecular weight results in vacuum residue and saturated and aromatics fraction obtained from the three techniques used show consistency within an acceptable range. However, the molecular weight results in resins and asphaltenes fraction obtained by the VPO technique significant differences compared with the results found using the techniques of GPC and DS-Gamma.
INVESTIGATION OF THE LASER POWER ATTENUATION IN OPTICAL FIBER
Authors: Ali Al - Saidi Imad Al - Deen Hussein
Published: September 2022

Attenuation characteristics of the power of the laser beam in the optical fiber of different lengths were investigated. Two continuous wave (CW) diode lasers of two different wavelengths, 532 nm, and 671 nm, in the visible spectral region, were used for the injection of the laser beam into the optical fiber. The output powers of both lasers can be varied over the range 0 - 50 mW. The attenuation coefficient (α) of the optical fiber was determined for the chosen wavelengths, 532 nm, and 671 nm. The attenuation coefficient (α) was measured as a function of the laser input power (Pin) and the optical fiber length. The obtained results show that the power attenuation of the laser beam is wavelength dependent. The power attenuation is significantly affected by changing the wavelength of the injected laser beam. It is observed that the increase in the laser input power (Pin) leads to an appreciable decrease in the attenuation of the laser power in the optical fiber.
THE IMPACT OF ENTREPRENEURIAL MARKETING ON FIRM PERFORMANCE: MEDIATING EFFECT OF NETWORK DIVERSITY AND LEARNING CAPACITY; MODERATING EFFECT OF COMPETITIVE INTENSITY
Authors: Khan Zaheer Ahmed , Husain Uvesh
Published: September 2022

This study investigates the role of entrepreneurial marketing as a predictor of firm performance. The research integrates variables of the dynamic interaction: mediating role of diversity of network and learning capability, moderating role of competitive intensity on the relationship between entrepreneurial marketing and performance of the firm.The study is explanatory in nature. To ensure the accuracy of quantitative results based on the experience of study participants, we employed a mixed method of qualitative and quantitative data collection. Data was collected in two stages: 1) field survey, 2) interviews of SMEs owners in Oman. The sample was purposively drawn from SMEs managers perceived to be knowledgeable about the tourism industry.No significant relationship was found between entrepreneurial marketing and firm performance. In addition, it was found that network selection mediates the relationship between entrepreneurial marketing and firm performance; however, learning capability does not.This study adds to the literature of the Omani market context on a strategic issue and provides managers with useful insights. Mixed methods provide a methodological contribution to understanding the dynamic relationship between variables presented in the entrepreneurship literature.
Computer-mediated communication (CMC) text analytics: Exploring the dynamics within digital discourse
Authors: Peeters Ward
Published: September 2022

While the scholarship on computer-mediated communication (CMC) can be described as a diverse field of study, with a variety of niche areas and transdisciplinary domains, one of the main recurring research practices within the field involves analytic examinations of digital discourse (Vásquez, 2022). These examinations generally include qualitative and quantitative measures of digital text which is produced, used and re-used in a fast-evolving communicative landscape. Because of the rapid succession of devices, programs and applications that are used for mediation, the methods for analysis sometimes lag behind (as discussed by Herring, 2019). This has raised the question among scholars on how to effectively study and visualise digital discourse, taking into account all affordances and contextual factors that digital resources provide (Car, 2020; Lin, 2015). This paper presents a number of key issues and challenges in the field, bringing together findings from Computer Assisted Language Learning and Learning Analytics studies to provide some new perspectives on CMC text analytics for education.
A study on social interactions among primary students in English vocabulary acquisition in a mobile learner-generated content learning environment
Authors: Yang Yin , Song Yanjie
Published: September 2022

This article reports on a study exploring primary students’ after-class social interactions in English vocabulary acquisition using a mobile learner-generated-content (m-LGC) tool. A total number of 29 grade 4 students from an elementary school in Hong Kong were involved. A case study approach was adopted. Data collection included log data on the m-LGC tool and semi-structured interviews. Data analysis included content analysis, visualisation using Gephi, and thematic analysis. The results show two types of students’ social interactions in a m-LGC learning environment. The interview results indicate that students held different perceptions of social interactions using the m-LGC tool. The implications are discussed.
Using screencasts to create personalized formative feedback in academic writing courses
Authors: Irwin Bradley
Published: September 2022

This presentation explores the effectiveness of using screencast feedback to improve essay composition in an academic writing course. Participants ( N = 20) were asked to complete two 1500-word argumentative essays and revise their essays based on two
types of formative feedback provided by their instructor. In one group ( N = 12), participants were given written feedback while the other group ( N = 8) received screencast feedback for their revisions. The essays were analyzed to compare whether the type of feedback influenced the quality of revision and whether students engaged in
self-correction. The results showed that participants who received screencast feedback evaluated it more positively than written feedback, completed a higher percentage of revisions, and engaged in more instances of self-correction.
Comparing the effectiveness of online and in-class collaborative writing
Authors: Cao Thi Xian Tu , Pham Vu Phi Ho
Published: September 2022

Collaborative writing (CW) was found to be beneficial to the students, and it has great impacts on the students’ writing outcomes. However, few studies have been investigated to see whether there are any differences in the impacts of writing between online and in-class collaborative writing. The present study analyzed 120 argumentative essays from
60 students, 30 from the virtual class and 30 from the in-class writing. The study only limits to three types of sentences written from each essay, such as simple sentences, compound sentences, and complex sentences. The study found that there were great effects of the CW on the students’ writing quality. However, there was no difference in the
effectiveness of CW in both traditional classroom and online platforms. The study claims that either platform of the language teaching, CW helps enhance students’ writing skills, and virtual classroom is also a great tool for writing activities.
A corpus of short YouTube news videos to inform course design and materials development in an EFL university setting in Japan
Authors: Cooper Christopher
Published: September 2022

The aim of the current study was to inform the course design of an elective English news listening course at a private university in Japan. YouTube channels from twelve countries across Asia, Africa, Europe and North America were manually selected by the researcher
as a source of in class materials and for course participants to view outside the classroom. To create materials for language-focused learning and assess the vocabulary demands of the videos, transcripts from the channels were extracted using the YouTube
Data API and Python, and a corpus of 8,286 video transcripts uploaded in 2021 was randomly sampled to represent the channels. The transcripts were cleaned, and frequency lists were created for adjectives, nouns, and verbs at CEFR B1 level and above. In addition, proper noun and multi-word unit frequency lists were created. An online concordancer was created using the open-source tool ShinyConc , so the learners could
investigate the usage of the words in the frequency lists by themselves. A Python script was written to assess the lexical coverage of the videos using the CEFR-J wordlist, and the results suggested that learners may need to be at the CEFR B2 level or above to
comfortably comprehend short news YouTube videos. Suggestions for future research are made in the paper, and Python code and supplementary data are available at the author’s
GitHub page (https://github.com/cooperchris17/yt_short_news ).