bluuebunny/crossref_metadata_2025_split huggingface dataset:
ANALISIS NILAI KEKASARAN DAN KEKERASAN PEMBUBUTAN BAJA KARBON MEDIUM DENGAN NOSE SUDUT PENGASAHAN HSS
Authors: Mujiarto Iman , Sutrisno Sutrisno , Prasetyo Andi 
Published: July 2023

ABSTRAK Proses pembubutan merupakan proses pemotongan atau pengurahan suatu bahan dengan menggunakan mesin bubut. Proses pembubutan pada baja karbon akan menghasilkan dampak bagi sifat mekanik dari baja tersebut, terutama sifat kekasaran permukaan baja dan juga sifat kekerasannya. Penelitian ini bertujuan untuk mengetahui nilai kekasaran dan nilai kekerasan dari proses pembubutan Baja Karbon. Spesimen yang digunakan dalam penelitian ini adalah Baja ST 41. Proses pembubutan menggunakan mata pahat HSS dengan sudut pengasahan 1O, 1,5O dan 2O. Pengujian yang digunakan dalam penelitian ini meliputi: uji komposisi material, uji kekasaran dan uji kekerasan material. Hasil yang didapat dari hajil uji komposisi material, menunjukkan spesimen yang dipakai yaitu Baja ST 41 merupakan termasuk salah satu dari kategori Baja Karbon Rendah. Hasil uji komposisi menunjukan kandungan karbon (C) dalam material tersebut adalah 0,2022%, kandungan mangan (Mn) adalah 0,4815%, kandungan fosfor (P) adalah 0,0217% , kandungan belerang (S) adalah 0,0213%. Nilai kekasaran tertinggi pada nose sudut 2O dengan nilai 5,214 μm. Nilai kekerasan tertinggi pada sudut pengasahan mata pahat 1,5O yaitu sebesar 64 HRC. Kata kunci: pembubutan, HSS, baja ST 41. ABSTRACT The turning process is the process of cutting or reducing a material using a lathe machine. The turning process on carbon steel will have an impact on the mechanical properties of the steel, especially the surface roughness and hardness of stell The aims of this research to determine the roughness and hardness values of the Carbon Steel turning process. The specimen used in this study was Steel St 41. The turning process uses HHS chisels with sharpening angles of 1O, 1.5O and 2O. The testing material used: material composition test, roughness test and hardness test. The results obtained from the material composition test show that the specimen used, namely ST 41 Steel, is one of the Low Carbon Steel categories. The results of the composition test show that the content of carbon (C) in the material is 0.2022%, the content of manganese (Mn) is 0.4815%, the content of phosphorus (P) is 0.0217%, the content of sulfur (S) is 0.0213% . The highest roughness value at 2O angle nose with a value of 5,214 μm. The highest hardness value at the tool sharpening angle is 1.5O, which is 64 HRC. Keywords: turning prosses, HSS, ST 41 Steel.
ANALISIS KEGAGALAN MAINTENANCE TOWER LAMP ATLAS COPCO B5+ MENGGUNAKAN METODE RELIABILITY CENTERED MAINTENANCE (RCM) DI PT XYZ
Authors: Ahmad Saiful , Komariah Ainur , Suprapto Suprapto 
Published: July 2023

PT XYZ adalah salah satu perusahaan pertambangan batu bara di Indonesia. Dalam melaksanakan operasional pekerjaan pertambangan, kendala yang dialami PT XYZ pada periode Januari 2022 hingga Februari 2023 adalah pada bagian support power plant, yaitu pada tower lampu. Pada tower lampu Atlas Copco B5+, terjadi frekuensi kerusakan tidak terjadwal yang cukup tinggi. Kerusakan tersebut mengakibatkan rendahnya kinerja tower lampu Atlas Copco B5+. Akibatnya aktivitas produksi pada malam hari terganggu dan menimbulkan kerugian bagi perusahaan. Untuk mengatasi permasalahan ini, digunakan metode Reliability Centered Maintenance (RCM). Dengan metode ini, dihasilkan analisis mengenai mode kegagalan lampu tower Atlas Copco B5+, besarnya nilai risk priority number (RPN), analisis waktu antar kegagalan (MTBF), serta dihasilkan rekomendasi tindakan perawatan pada 3 komponen paling kritis yang paling tinggi nilai RPN-nya. Dari pengumpulan data primer diketahui 7 komponen mengalami mode kegagalan. Kemudian dengan perhitungan skor severity, occurance, dan detection; diperoleh tiga komponen dengan nilai RPN tertinggi yaitu filter bahan bakar (RPN 300), kapasitor (RPN 240), dan baterai (RPN 150). Hasil perhitungan mean time between failure (MTBF) pada komponen filter bahan bakar adalah 256,82 jam; kapasitor 714;29 jam; dan baterai 1.277,5 jam. Tindakan preventive maintenance yang yang disarankan untuk perawatan tiga komponen ini adalah penggantian. Penggantian filter bahan bakar disarankan untuk dilakukan sesudah 250 jam operasi, dari sebelumnya 500 jam operasi, untuk mengurangi terjadinya kerusakan tidak terjadwal. Untuk kapasitor dan baterai, tindakan perawatan yang disarankan adalah dengan menambahkan item ini pada lembar pemeriksaan berkala 7 hari. Penggantian kapasitor disarankan setiap 750 jam operasi, sedangkan penggantian baterai disarankan setiap 1.250 jam operasi.
Penerapan Model Pembelajaran Kooperatif Jigsaw Untuk Meningkatkan Hasil Belajar Matematika Tentang Denah Letak Benda Pada Siswa Kelas VI SDN 6 Besito
Authors: Rokhis Rokhis 
Published: July 2023

Every teacher must contribute to the learning process. The series of learning processes can be realized in the concrete action. it's call the reseach especially the name is Classroom Action Research. So the learning model with Jigsaw type used for this research order to improve the learning outcomes of mathematics, especially the layout material for objects in class VI SDN 6 Besito who have not been able to absorb material about the layout of objects. By establishing The jigsaw cooperative learning method, it's can increase the average value of student learning achievement, namely in the first cycle of 52.36 and an average increase of 78.11 in Cycle II. Then for the percentage of students' mastery learning that is as much as 23.53% in Cycle I and increased to 82.35% in Cycle II. In addition, the effect of the application of this jigsaw cooperative learning method is proven to influence the behavior patterns of students towards a better direction so as to improve learning achievement, as evidenced by the increasing number of students who actively participate in the learning process, the courage of students in asking questions, answering the questions from teacher and expressing the opinions
The Relationship Between the Duration of Gadget Use and Emotional and Hyperactivity-Inattention Behavior in Adolescent
Authors: Azzahara Andi Nurul Hidaya , Rimayanti Ulfah , Wiyata Gama Arlina , Trisnawaty  
Published: July 2023

Backgrounds Adolescence is a physical and mental development period that various factors could influence. Aims This research aims to determine the relationship between the duration of gadget use and emotional symptoms and hyperactivity disorder in adolescents. Methods This research is a cross-sectional study with a quantitative approach using the Strengths & Difficulties Questionnaire (SDQ) to determine adolescents’ emotional and hyperactivity-inattention behavior. This research is a correlational study in which 142 students at SMA Negeri 4 of Wajo Regency selected as research subjects. We analyze research data using the Chi-Square test with a significance level of 5%. Results The results of the Chi-Square test indicate that the p-value amount to 0.062 (emotional symptoms) and 0.170 (hyperactivity disorder). Emotional symptoms and hyperactivity-inattention indicate a p-value of >0.05 (more than 0.05). Conclusion From this research, there are differences between groups with different duration of gadget use and emotional symptoms, as well as groups with different duration of gadget use and hyperactivity-inattention in adolescents, but they were statistically insignificant.
Með börnin heima í samkomubanni
Authors: Hreiðarsdóttir Anna Elísa , Elídóttir Jórunn 
Published: July 2023

Í mars 2020 voru gefnar út reglur á Íslandi þar sem settar voru skorður á samkomur, starfsemi í framhalds- og háskólum færðist á netið, rekstur leik- og grunnskóla var takmarkaður og stjórnvöld hvöttu foreldra til að hafa börnin heima ef þess var kostur. Rannsóknin sem hér er kynnt beinist að velferð ungra barna á tímum COVID-19 þegar flestu var skellt í lás í þjóðfélaginu og skólahald breyttist hjá börnum. Þátttakendur í rannsókninni voru tólf fjölskyldur leikskólabarna og voru tekin endurtekin viðtöl við þær á tímabilinu mars til maí 2020. Áherslan var á þau áhrif sem ástandið hafði almennt á börnin og fjölskyldurnar og áskoranirnar sem fylgdu í kjölfarið. Jafnframt var horft fram á við og dregið fram hvað hægt er að læra af reynslunni, bæði er snýr að velferð barna nú á dögum og til framtíðar litið.
Niðurstöður sýna að faraldurinn hafði víðtæk og mikil áhrif á fjölskyldurnar. Fjölskyldulífið breyttist en foreldrar voru sammála um að rútína og skipulag hafi skipt miklu máli sem og að hafa nóg að gera fyrir börnin. Margir töldu að þessi tími hefði gefið þeim tækifæri til að kynnast börnunum betur og á margan hátt var gott að geta dregið úr ytra áreiti. Úrræði og samheldni fjölskyldna virtist draga úr álaginu og gerði upplifunina að sumu leyti jákvæða þegar litið var til baka. Þær ályktanir má draga að samfélagið hefði getað stutt betur við barnafjölskyldur á tímum samkomubanns, til dæmis með því að gefa þeim möguleika á að hafa einhvern til að tala við utan fjölskyldunnar
Plant-Parasitic Nematodes Associated with Cannabis sativa in Florida
Authors: Desaeger J. , Coburn J. , Freeman J. , Brym Z. 
Published: July 2023

Abstract
The subtropical climate of Florida allows for a wide range of crops to be grown. With the classification of hemp (Cannabis sativa L., <0.3% delta-9-tetrahydrocannabinol) as an agricultural commodity, hemp has become a potential alternative crop in Florida. Hemp cultivars of different geographies (Europe, China, and North America), and uses (fiber, oil and CBD), were evaluated in three field experiments. The field experiments evaluated a total of 26 cultivars and were conducted for two consecutive seasons at three different locations (soil types) in North (sandy loam), Central (fine sand), and South Florida (gravelly loam). Nematode soil populations were measured at the end of each season. A diverse population of plant-parasitic nematodes was found, with reniform nematodes (RN, Rotylenchulus reniformis) the dominant species in North and South Florida (up to 27.5 nematodes/cc soil), and RKN (Meloidogne javanica) the main species in central Florida (up to 4.7 nematodes/cc soil). Other nematodes that were commonly found in south Florida (and to a lesser extent north Florida) were spiral (Helicotylenchus spp.), stunt (Tylenchorhynchus spp.) and ring nematodes (Criconemoids), while in central Florida, stubby root (Nanidorus minor) and sting nematodes (Belonolaimus longicaduatus) were found. No significant difference among hemp cultivars was noted at any of the locations. RKN were found in all three regions and soils, while RN were only found in North and South Florida. This is the first report on plant-parasitic nematodes associated with hemp in Florida fields. Natural nematode populations varied greatly, depending on where in Florida hemp was grown. Growers who wish to include hemp in their crop rotation need to be aware of potential pest pressure from nematodes. More research is needed to determine to what extent nematodes, especially RKN and RN, can reduce hemp growth and yield.
TERMITE SPECIES DIVERSITY IN OIL PALM PLANTATIONS IN DHARMASRAYA DISTRICT, THE PROVINCE OF WEST SUMATRA
Authors: Heriza Sri 
Published: July 2023

Termite are pests that often attack oil palm plantations. Information on the diversity of termite species that attack oil palm plants is needed in an effort to save oil palm yields. The method in this study used an observation plot measuring 50 m x 10 m. One observation plot was divided into observation sub-plots with a size of 5 m x 5 m in order to obtain 20 observation sub-plots. Each observation plot was carried out in eleven sub-districts in Dharmasraya Regency. Termite samples in each observation plot were identified in the laboratory. Every termite found in the observation sub-plot was collected. The termites collected were from the caste of soldiers and workers. The termites were put into a collection bottle containing 70% alcohol and labeled, then identified descriptively by observing the characteristics of the termites including the shape and size of the head, mandible, and the antenna segments of the soldier caste. Identification was carried out using a Leica M205 C microscope and photographed with a Leica DFC450 camera. In this study there are 8 species of termites found viz Coptotermes curvignathus, Schedorhinotermes longirostris, Schedorhinotermes javanicus, Heterotermes indicola, Globitermes globosus, Dicuspiditermes nemorosus, Pericapritermes mohri, Macrotermes gilvus.
Status de vitamina D em indivíduos com lúpus eritematoso sistêmico: estudo observacional retrospectivo
Authors: Lima Josânia da Silva , Oliveira Ana Carla Miranda de , Bastos Ana Clara Antunes , Oliveira Bianca Rodrigues de , Costa Camila Bisconsin Castro , Silva Laís Rivelli , Pereira Maria Fernanda Lima , Couto Melina Maia , Reis Lívia Bitencourt dos , Franco Danielle Cristina Zimmermann 
Published: July 2023

Objetivo: Determinar a prevalência de hipovitaminose D em pacientes com lúpus eritematoso sistêmico (LES). Métodos: Trata-se de um estudo transversal a partir de dados coletados entre janeiro e agosto de 2019, por meio de prontuários de pacientes de ambos os sexos, com diagnóstico de LES, idade de 18 a 80 anos e dosagem sérica de calcidiol (25(OH)D). Os dados foram analisados por meio de estatística descritiva, teste t, ANOVA e quiquadrado (p<0,005). O estudo foi aprovado por Comitê de Ética em Pesquisa. Resultados: Houve predomínio do sexo feminino 96,43% na amostra, com idade média de 48 ± 13 anos. Apenas 32% dos pacientes apresentaram valores de 25(OH)D adequado. A concentração média de 25(OH)D foi de 26,06 ng/dL. Conclusão: Foi constatado alta prevalência de níveis inadequados de vitamina D sérica tanto em pacientes com LES, quanto na população saudável. Tal fato é relevante devido a existência de recomendação específica para valor de vitamina D entre 30 e 60 ng/mL em pacientes com LES, superior ao da população em geral, e pela peculiaridade que eles têm de não poderem se expor aos raios solares.
TWO THERMODYNAMIC METHODS FOR DETERMINING THE DEGREE OF HYDRATION OF NEGATIVE IONS
Authors: Морозов И.И. , Дансюрюн Д.Х. 
Published: July 2023

В данной статье исследуется использование термодинамических методов для определения степени гидратации отрицательных ионов. Обсуждаются два основных метода: метод определения энтальпии растворения электролита и методы определения энтропии растворения электролита. Оба метода основаны на измерении изменений тепловой энергии в растворе. Энтальпийный метод используется для определения координационного числа отрицательных ионов, а энтропийный метод используется для определения гидратного числа.
This article investigates the use of thermodynamic methods for determining the degree of hydration of negative ions. Two main methods are discussed: the method of determining the enthalpy of electrolyte dissolution and the methods of determining the entropy of electrolyte dissolution. Both methods are based on measuring changes in thermal energy in the solution. The enthalpy method is used to determine the coordination number of negative ions, while the entropy method is used to determine the hydration number.
SPECIES COMPOSITION AND FAUNAL STRUCTURE OF BLOOD-SUCKING MOSQUITOES (DIPTER A, CULICIDAE) OF ANTHROPOGENIC TERRITORIES OF THE NORTH CAUCASUS
Authors: Гаджиева С.С. , Джамалутдинова Т.М. , Джаруллаев Д.Г. , Джахбарова З.М. 
Published: July 2023

Цель. Основной целью исследования является изучение видового состава и фаунистической структуры кровососущих комаров и влияние хозяйственной деятельности человека северных территории Кавказа. Методы. В работе исследования применяли метод отлова взрослых особей на себе, на днёвках и во время роения обычным сачком. Во всех исследованных водоёмах различного типа учитывали личиночные фазы кровососущих комаров. Обсуждение. Результаты проведенного исследования показали, что фауна кровососущих комаров северного Кавказа в последние годы испытывает существенные качественные и количественные изменения под воздействием антропогенного преобразования ландшафтов и процессов урбанизации. С развитием процесса урбанизации в структуре фауны населенных пунктов наблюдают стабильно высокую численность комаров. Выводы. Различия в качественном и количественном отношении фауны кровососущих комаров района исследования мы объясняем антропогенным преобразованием ландшафтов: вырубкой лесов с последующей заменой их более сухими мелколиственными, осушением болот, преобразованием естественных природных биотопов в агроценозы. Другим мощным фактором антропогенного воздействия на природу Кавказа является бурно протекающий процесс урбанизации.
Purpose. The main purpose of the study is to study the species composition and faunal structure of blood-sucking mosquitoes and the impact of human economic activity in the northern Caucasus. Methods. In the work of the study, the method of trapping adult individuals on themselves, on diaries and during swarming with a conventional net was used. Larval phases of blood-sucking mosquitoes were taken into account in all the studied reservoirs of various types. Discussion. The results of the study showed that the fauna of the blood-sucking mosquitoes of the North Caucasus has been experiencing significant qualitative and quantitative changes in recent years under the influence of anthropogenic transformation of landscapes and urbanization processes. With the development of the urbanization process, a consistently high number of mosquitoes is observed in the structure of the fauna of settlements. Conclusions. We explain the differences in the qualitative and quantitative ratio of the fauna of blood-sucking mosquitoes in the study area by anthropogenic transformation of landscapes: deforestation with subsequent replacement by drier small-leaved forests, drainage of swamps, transformation of natural biotopes into agrocenoses. Another powerful factor of anthropogenic impact on the nature of the Caucasus is the rapid process of urbanization.
ASSESSMENT OF THE QUALITY OF NEW ENVIRONMENTAL PROTECTION TECHNOLOGIES IN CONSTRUCTION
Authors: Шершнева М.В. 
Published: July 2023

В статье рассмотрена проблема оценки качества экозащитных технологий. Показано, что оценка может быть осуществлена путем использования рейтингового метода определения индекса PQ. В статье приведены результаты оценки экозащитных технологий, указаны недостатки предлагаемого метода.
The article considers the problem of assessing the quality of environmental protection technologies. It is shown that the assessment can be carried out by using the rating method for determining the PQ index. The article presents the results of the assessment of eco-protective technologies, indicates the shortcomings of the proposed method.
GEOECOLOGICAL FOUNDATIONS OF TECHNOSPHERE SAFETY
Authors: Криночкина О.К. , Озерова Н.В. 
Published: July 2023

В статье анализируется актуальная информация об экологической ситуации в Уфе. Результаты геоэкологических исследований позволяют предложить подходы к анализу загрязнений атмосферного воздуха для обеспечения геологической безопасности и сохранения здоровья населения.
The article analyzes up-to-date information about the environmental situation in Ufa. The results of geoecological studies allow us to propose approaches to the analysis of atmospheric air pollution to ensure geological safety and preserve public health.
СОВРЕМЕННЫЕ ТРЕБОВАНИЯ К ОБЪЕМНО-ПЛАНИРОВОЧНЫМ РЕШЕНИЯМ ОБЩЕСТВЕННЫХ ЗДАНИЙ
Authors: Калинина Н.С. , Лаврик М.И. , Нурмаммедова М.К. 
Published: July 2023

Статья посвящена исследованию современных требований к объемно-планировочным решениям общественных зданий. Рассматриваются основные аспекты проектирования пространств для организации отдыха и досуга, включая необходимость создания комфортных условий для посетителей, а также использование современных технологий и материалов, чтобы улучшить качество этих сооружений. Анализируются примеры лучших практик в проектировании велнес-центров, школ-санаториев и др. Рассмотрены принципы организации пространства и дизайна, а также представлены рекомендации для архитекторов и дизайнеров, которые занимаются проектированием подобных зданий.
The article is devoted to the study of modern requirements for space-planning solutions of public buildings. The main aspects of designing spaces for recreation and leisure are considered, including the need to create comfortable conditions for visitors, as well as the use of modern technologies and materials to improve the quality of these structures. Examples of the best practices in the design of wellness centers, sanatorium schools, etc. are analyzed. The principles of space organization and design are considered, as well as recommendations for architects and designers who are engaged in the design of such buildings are presented.
EXPERIMENTAL RESEARCH IN A WIND TUNNEL IN ORDER TO OBTAIN INITIAL DATA FOR ICE FORMS DIGITAL MODELING
Authors: Гаджимагомедов Г Г. , Шардин А О. , Юстус А А. 
Published: July 2023

В работе приводятся результаты экспериментального моделирования процесса обледенения прямого крыла, проводившееся в аэрохолодильной трубе сезонного действия. Целью моделирования является получение зависимости формы ледяных наростов от параметров окружающей среды (температура, давление, влажность, скорость потока, диаметр капель), которая будет в дальнейшем использоваться для верификации методик расчета процесса нарастания льда.
The paper presents the results of experimental modeling of the direct wing icing process, which was carried out in a seasonal wind tunnel. The purpose of modeling is to obtain the dependence of the shape of ice growths on environmental parameters (temperature, pressure, humidity, flow rate, droplet diameter), which will be further used to verify methods for calculating the process of ice growth.
OBTAINING A PIEZOELECTRIC COATING WITH TARGET PROPERTIES FOR MONITORING THE STATE OF POLYMER COMPOSITE MATERIALS
Authors: Соколов Я.А. , Князева И.О. , Воронина С.Ю. , Руденко М.С. 
Published: July 2023

Объектом исследования является интеллектуальное покрытие для ПКМ, позволяющее отслеживать его геометрические изгибы и повреждения. Использование данного покрытия позволит проводить мониторинг состояния полимерных материалов на которых оно будет установлено. Созданная тонкая пленка из коллоидного раствора MXene методом вакуумной фильтрации является основным предметом данного исследования.
The object of the study is an intelligent coating on PCM, which allows tracking its geometric bends and damage. The use of this coating will allow monitoring the state of polymeric materials on which it will be installed. The creation of a thin film from a colloidal solution of MXene by vacuum filtration is the main subject of this study.
ON POSSIBLE WAYS OF FORMATION OF VEGETATIVE FORMS IN FIR TREES (PICEA A.DIETRICH)
Authors: Матюхин Д.Л. 
Published: July 2023

В данной статье рассматриваются морфологические особенности некоторых форм у трех видов елей, предлагаются потенциально возможные способы их образования. Возникновение структурных форм связано с перераспределением программ развития побегов внутри особи: ростовых, трофических, ювенильных или субсенильных побегов на побеги, свойственные конкретным формам. Это явление можно рассматривать как один из вариантов гетеротопий.
This article examines the morphological features of some forms in three species of fir trees, and suggests potentially possible ways of their formation. The emergence of structural forms is associated with the redistribution of programs for the development of shoots within an individual: growth, trophic, juvenile or sub-juvenile shoots to shoots peculiar to specific forms. This phenomenon can be considered as one of the variants of heterotopias.