bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of flow field characteristics and structure optimization of the split-stream rushing muffler for diesel engine
Authors: Su He , Wu Pei , Xue Jing , Zhang Yongan , Zhang Haijun
Published: February 2020

In order to analyze the flow field characteristics of the split-stream rushing muffler, a theoretical model describing the velocity of the split streams is established and verified by the tracer test. For this new-principle muffler, the acoustic performance and the relationship between
the velocity drop of the airflow and the pressure field are analyzed, also the structure optimization of the muffler is carried out based on the orthogonal test. Finally, a new muffler is fabricated based on the designing theory of this type of muffler for a prototype of diesel engine, and
the comparative analyses are conducted compared with its original muffler. The results show that the establishment and analysis of the theoretical model for velocity during the split-streams rushing process are correct. In the frequency range of 0â–“1000 Hz, the average transmission
loss of split-stream rushing muffler is better than that of the original muffler. While the speed of airflow is reduced by split-streams rushing, a certain pressure loss is caused at the same time, which is about 50% of total pressure loss of the muffler, and the average fluid resistance coefficient
of the split-stream rushing process is 0.91. Compared to the original muffler of the sample engine, the average insertion loss of the optimized new muffler is increased by 61.2%. At inlet air velocity of 30 m/s, the pressure loss is reduced by 16.8%. The results provide a potential for practical
engineering application of this new split-stream rushing muffler in future.
An analysis of Politeness Strategies in Indonesian English Textbooks
Authors: Meiratnasari Ayu , Wijayanto Agus , Suparno Suparno
Published: February 2020

The research aimed explores politeness approaches in EFL textbooks, especially Indonesian English textbooks. There were two textbooks which analysed as the sample for this study. The textbooks entitled “Talk Active 1” and “Talk Active 2: Language and Culture Programme”. The researcher limited the analysis on the dialogs which provided as materials in the textbooks. Brown & Levinson's (1987) politeness strategies were applied to categorize the data. The researcher applied content analysis method proposed by Denscombe, (2010) as the research method. The results of the study revealed bald on-record, positive politeness, negative politeness, and off-record were reflected in the Indonesian English textbooks. Both types of bald on-record strategies were found in the Indonesian English textbooks. However, there were only three types of off-records strategies were reflected in the textbooks. The finding revealed 11 types of positive politeness as strategy follows: S1: Notice, attend to hearer; S2: Exaggerate, S3: Intensify interest to hearer; S4: Use in-group identity markers; S6: Avoid disagreement; S7: Presuppose/assert/raise common ground; S8: Joke; S10: Offer, promise; S12: Include both speaker and hearer in the activity; S13: Give (or ask for) reasons; S14: assume or assert reciprocity. The result also presented 8 types of negative politeness as follows: S1: Be conventionally indirect; S2: Question, hedge; S3: Be pessimistic; S4: Minimize the imposition; S5: Give deference; S6: Apologize; S7: Impersonalize speaker and hearer and S10: Go on record as incurring a debt, or as not indebting hearer. The analysis showed positive and negative politeness strategies were central strategies that reflected in the textbooks. It proved that Indonesian English textbooks have pragmatics input for the students.
Khitan Perempuan dalam Sunan Abu Daud
Authors: Romziana Luthviyah
Published: February 2020

The word khitan (circumsion) come from the word khatn, wich mean that the part that is cut from the boys or the girls genetalia. Khitan from prophet Ibrahim in the past also get circumcision althought his age is 80 years old.

Khitan (circumsion) for girl known by the term female genital cutting and female circumsion. Practically, female genital is done by cutting of all clitoris then saw it until remain a little hole. Where this practice model is used many times at the Pharaoh's time in ancient Egypt as an effort oppression of women and decrease sexual libido.

In this case, circumsion for girl will be explained at hadits that was narated by Abu Dawud.

Keyword: Khitan, female genitale mutilation, Sunan Abu Dawud
Self-study en el diseño de la estrategia metodológica de Aprendizaje Basado en un Proyecto Docente (ABPD) para la formación de profesorado
Authors: De la Iglesia Villasol Mª Covadonga
Published: February 2020

Tras más de una década de formación a futuros docentes, la autoreflexión sobre la práctica para el aprendizaje es inevitable, para interpretar, construir y definir el saber hacer en la profesión, propia y de los futuros docentes. En la formación de éstos, la creatividad es condición necesaria para servir de transmisor del saber hacer y favorece el acercamiento multidisciplinar en el aprendizaje, donde las TIC, en la era digital, sirven de hilo conductor en la coordinación de recursos, contenidos, y estrategias didácticas. Este entorno virtual se muestra excepcionalmente útil para aportar una visión radial e integral de los procesos de enseñanza y aprendizaje, para quienes cursan el Máster de Formación del Profesorado (MFP), que potencia el desarrollo de competencias y/o habilidades requeridas en el entorno profesional al que se enfrentan, la enseñanza y transmisión de conocimientos. En este trabajo se muestra, a modo de caso, el proceso reflexivo personal seguido en la implantación de una propuesta integral de Aprendizaje Basado en un Proyecto Docente (ABPD), que se ha gestado desde la puesta en marcha del MFP en la UCM en la asignatura de Didáctica en la especialidad de Economía y Administración de Empresas (ADE y ECO), desde el enfoque del self-study en la formación práctica y pedagógica, conjugando el binomio universidad y centros educativos de secundaria.
Impacto de la producción científica acerca de la educación para muerte: Revisión bibliométrica en Scopus y Web of Science
Authors: Martínez-Heredia Nazaret , Bedmar Moreno Matías
Published: February 2020

La pedagogía para la muerte puede definirse como un área de conocimiento educativo emergente la cual nos permite centrarnos en una intervención para poder crear un proceso de enseñanza y aprendizaje acorde con las dimensiones del ser humano. La presente investigación pretende analizar bibliométricamente la producción científica de mayor impacto sobre educación para la muerte en las principales bases de datos de carácter multidisciplinar: Scopus y Web of Science. Se delimitaron cuatro descriptores para la búsqueda: “death education”-“educación para la muerte” y “death pedagogy”-“pedagogía para la muerte”. Se analizó la información en torno a 10 variables: cuantía de publicaciones de los últimos cinco años, y por año natural, tipología de documento, área de indexación, publicaciones periódicas, internacionalización de la investigación, institución de publicación, autoría de publicación, publicaciones con mayor impacto y palabras clave. Los resultados han proyectado un campo científico que se encuentra todavía en vías de desarrollo, aunque el año 2018 fue el año con mayor producción científica (n=11) seguido del 2019 (n=7),resaltando una evolución considerable en la producción científica sobre pedagogía para la muerte. Concluimos, que este artículo presenta una revisión necesaria en pedagogía de la muerte, que ayude a generar conocimiento en investigadores.
HUBUNGAN PEMBERIAN MAKANAN PAPAHAN DENGAN KEJADIAN DIARE PADA BALITA USIA 6 – 24 BULAN DI WILAYAH KERJA PUSKESMAS SENGKOL KECAMATAN PUJUT KABUPATEN LOMBOK TENGAH
Authors: Sopian Mamang , Purbowati  , Pontang Galeh Septiar
Published: February 2020

Latar Belakang : Pemberian makanan papahan dapat menjadi media penyebaran penyakit antara ibu dengan bayi, dimana jika seorang ibu menderita penyakit-penyakit infeksi menular tertentu yang berhubungan dengan gigi dan mulut serta pernapasan maka akan sangat mudah untuk ditularkan pada bayinya misalnya penyakit ISPA dan diare Tujuan : Mengetahui hubungan pemberian makanan papahan dengan kejadian diare pada balita usia 6 – 24 bulan di wilayah kerja Puskesmas Sengkol Kecamatan Pujut Kabupaten Lombok Tengah Metode : Jenis penelitian ini merupakan studi kolerasi menggunakan pendekatan crosssectional di wilayah kerja puskesmas Sengkol Kecamatan Pujut Kabupaten Lombok Tengah. Sampel sebanyak 101 reponden diambil dengan metode Proportional Random Sampling pemberian makanan papahanan dan kejadian diare di ukur menggunakan kuesioner. Analisis data dengan menggunakan uji kolerasi Chi Square (α = 0,05). Hasil : Frekuensi makanan papahan sebanyak 26,6% (29 responden) dan makanan tidak papahan dengan persentase 73,4% (80 responden). Frekuensi kejadian diare pada balita adalah tidak pernah dengan persentase 58,7% (64 responden) dalam satu bulan terakhir, jarang sebanya 26,2% (29 responden) dalam satu bulan terakhir dan sering sebanyak 14,7% (16 responden) dalam satu bulan terakhir. Simpulan : Ada hubungan antara pembeberian makanan papahan dengan kejadian diare pada balita usia 6 – 24 bulan di wilayah kerja Puskesmas Sengkol Kecamatan Pujut Kabupaten Lombok Tengah
Preliminary seismic hazard assessment of the Arctic Gakkel ridge and surrounding
Authors: Assinovskaya Bela , Panas Natal’ia , Antonovskaya Galina
Published: February 2020

This study describes primary data, methods of estimation and final results of the preliminary seismic hazard assessment in the region of the Gakkel Ridge that is a northernmost seismogenic zone of the Earth. According to geological data, the region is considered potentially oil and gas, but its industrial development has not yet begun. These authors for the Baltic Sea did the similar work earlier. At the first stage of this study, the earthquake catalog unified in magnitude Mw was compiled for the period from 1912 to 2014. Information on seismic events from historical sources and the ISC catalog was used, as well as the results of observations of the Arkhangelsk seismic network in the Arctic for 2014–2018. The representative part of earthquake data was revealed and the seismic regime has been studied. By seismicity origin, the region is divided into the highly active rift zone of the Gakkel Ridge and the continental slopes of the Barents, Kara and eastern Laptev seas with weaker activity, separated and framed by aseismic areas like the Nansen, Amundsen basins and the Lomonosov Ridge. The seismic zoning of the study region was carried out based on structural analysis of geological and geophysical data. The mapping of probabilistic seismic hazard in terms of maximum accelerations of PGA soil movements for a return period of 500 and 100 years (10% probability of exceedance in the next 50 and 10 years) was conducted using the CRISIS program. As expected, the most dangerous was the Gakkel zone about 200 km wide.
Seismic mode “drumbeats”, caused by the movement of a viscous lava flow during the Kizimen volcano eruption in may-october 2011
Authors: Shakirova Aleksandra , Firstov Pavel
Published: February 2020

The “drumbeats” mode is a sequence of volcanic earthquakes with similar waveforms (multiplets) that are recorded from tens of minutes to months. As a rule, the “drumbeats” mode accompanies the squeezing of lava blocks on extrusive domes of andesite-dacite volcanoes. Squeezing and movement of a viscous lava flow during an eruption Kizimen volcano in 2010-2013 was accompanied by multiplets with energy classes K<6 (magnitudes < 2.5), which were recorded from tens of minutes to months. Two series of the strongest multiplets were recorded during the four months from May to mid-October 2011. The volcanic earthquakes of multiplets can be attributed to hybrid and long-period. The coordinates of the foci were identified for the most powerful 35 events of two multiplets of “drumbeats” mode and were localized in the frontal part of the lava flow. The location of the volcanic earthquakes hypocenters suggests that they are generated during the motion of a viscous lava flow the volcano slope. The emergence of multiplets, apparently, can be considered as a process of self-oscillations of the relaxation type.
GS RAS alert survey
Authors: Kolomiets Marina , Dulentsova Lyudmila , Ryzhikova Mariya
Published: February 2020

There is submitted a review of geophysical survey alert service per first half-year period in the article. There is described input information flow used for earthquake data processing. There is given a description of earthquake summary processing that takes place into 3 stages and data exchange with international seismological centers. There have been analyzed the results of the online processing of 2534 earthquakes in the world per the first half-year period of 2019. There is submitted a review of seismic intensity as per data of geophysical survey alert service on the area of Russia and in the world during that period.
The Effect of Ownership Structure, Cash Holding and Tax Avoidance on Income Smoothing
Authors: Alexander Nico
Published: February 2020

Objective – This study aims to undertake an empirical study of the influence of ownership structure, cash holding, and tax avoidance on income smoothing.
Methodology/Technique – Ownership structure in this research is measured by public ownership and managerial ownership. The population of this research are manufacturing companies listed on the Indonesian Stock Exchange (IDX) between 2015-2017 and there are 50 companies that meet the criteria and serve as the research sample. The sample selection in this study uses purposive sampling and the hypotheses were tested using binary logistics.
Findings – The results of this study show that managerial ownership and public ownership, cash holding by companies and tax avoidance do not have influence on income smoothing. These results show that managerial ownership and public ownership do not affect income smoothing because there are same interest, to improve their wealth. Similarly, neither how much cash is held by a company nor tax avoidance behavior effect income smoothing.

Type of Paper: Empirical

Keywords: Income Smoothing; Ownership Structure; Cash Holding; Tax Avoidance.

Reference to this paper should be made as follows: Nico Alexander. 2019. The Effect of Ownership Structure, Cash Holding and Tax Avoidance on Income Smoothing, J. Fin. Bank. Review, 4 (3): 128 – 134 https://doi.org/10.35609/jfbr.2019.4.4(3)

JEL Classification: G23; G28.
Performance Analysis Of Manggarai Station Service Facilities on Passenger Satisfaction
Authors: Meutia Wita , Yuliana Erma
Published: February 2020

Pada stasiun manggarai telah melakukan perbaikan infrasturktur diantaranya adalah menambah gerbong kereta, menambah jumlah jadwal pemberangkatan kereta, menyediakan gerbong khusus wanita, menerbitkan e-ticketing, menambah petugas kereta, perluasan kawasan parkir, renovasi toilet dan mushola, penggusuran kios-kios untuk memperluas peron stasiun, serta perpanjangan peron stasiun . Dengan adanya perbaikan tersebut diharapkan dapat memberikan layanan terbaik untuk meningkatkan kepuasan penumpang KRL. Penelitian ini bertujuan untuk mengetahui unsur pelayanan yang perlu dierbaiki pada Stasiun Manggarai berdasarkan tingkat kepuasan penumpang. Metode yang digunakan dalam penelitian ini adalah menggunakan kuesioner yang berisikan karakteristik responden dan Tingkat kepuasan dan harapan pengguna KRL, yang memuat pertanyaan mengenai Realibility (Keandalan), Responsiveness (Daya Tanggap), Assurance (Jaminan), Emphaty (Empati), Tangibles. Berdasarkan analisis diperoleh variabel yang menjadi prioritas utama dalam peningkatan kinerja pelayanan adalah Informasi gangguan kereta (60,81%) dan Tingkat keamanan di stasiun (67,67%). Variabel yang harus tetap dipertahankan kinerjanya adalah Ketepatan jadwal kereta (69,56%) serta Penampilan kerapihan para petugas.
Pemanfaatan Radio Frequency Identification Mifare RC522 dan Arduino Sebagai Media Validasi Kehadiran Mahasiswa
Authors: Zakaria Andriansyah , Prihantara Andesita
Published: February 2020

In every academic and student activity, data collection on student meetings is always done. General student data collection activities are still carried out manually by filling in the student attendance form. Besides being able to help and correct problems in lecturing activities, the manual presentation system is not practical in centralized recording and also increases human error in recording. The technology that can be used to add to these shortcomings is Radio Frequency Identification (RFID) in the presence of students. By utilizing RFID technology to approve and MySQL as a database, it is expected that student data collection and recording can be done easily and centrally. It can be concluded from the study that each RFID card used is a unique card identity that functions as a valid marker or identity for students or lecturers in conducting attendance.
ІНТЕГРАЛЬНА ОЦІНКА РІВНЯ ФІНАНСОВОЇ БЕЗПЕКИ КОМЕРЦІЙНОГО БАНКУ
Authors: Керімова Сєвда , Бойко Світлана
Published: February 2020

У статті досліджено методичні підходи вітчизняних вчених щодо оцінки рівня фінансової безпеки комерційних банків та запропоновано власну методику, що базується на обчисленні інтегрального показника рівня фінансової безпеки банку та виділенні трьох складових: капітало-ресурсної, кредитно-інвестиційної та дохідно-витратної безпеки. Інтегральну оцінку фінансової безпеки банку апробовано на прикладі АТ «Ідея Банк».
ОПРОБЛЕМИ ЗАБЕЗПЕЧЕННЯ ПРИБУТКОВОЇ ДІЯЛЬНОСТІ ПІДПРИЄМСТВ БУДІВЕЛЬНОЇ ГАЛУЗІ
Authors: Богданова Оксана , Тюлькіна Катерина
Published: February 2020

У статті досліджуються існуючі підходи до визначення прибутку, види прибутку та фактори впливу на прибуток. Аналізуються основні показникидіяльності підприємств будівельної галузі. Завдяки формулюванню висновків щодо основних проблем будівельних підприємств автор пропонуєвпровадження заходів, які дозволять забезпечити їх прибуткову діяльність
ДОСЛІДЖЕННЯ ТА АНАЛІЗ АЛГОРИТМІВ ФАКТОРИЗАЦІЇ ЧИСЕЛ
Authors: Козюкалов Максим , Бойко Микола
Published: February 2020

Дана стаття має на мету вивчити та описати розглянуті алгоритми факторизації чисел. Проаналізовано такі алгоритми як: метод факторизації Ферма; перебір можливих дільників; алгоритм r-Полард; квантовий алгоритм Шора. Порівняння послідовних і паралельних алгоритмів. Проведено аналіз отриманих даних.
A review of the anatomy and a step-by-step visual guide to performing an ultrasound-guided supraclavicular brachial plexus block
Authors: Govender S , Möhr D , Tshabalala ZN , Van Schoor AN
Published: February 2020

Background: The aim of this description is to provide step-by-step guidelines for performing an ultrasound-guided supraclavicular brachial plexus nerve block.

Methods: The brachial plexus in the supraclavicular fossa of sixty healthy volunteers was scanned in the horizontal/transverse plane. The relevant regional anatomy was studied to identify the muscular and vascular structures seen on the ultrasound screen.

Results: The entire process was documented and a standard, step-by-step guide to performing ultrasound-guided supraclavicular brachial plexus blocks was developed.

Conclusion: This description serves as a comprehensive guide to a technique for performing ultrasound-guided supraclavicular brachial plexus blocks safely and successfully. It also aims to provide the reader with the background knowledge of the technique and the surrounding regional anatomy.
Risk quantification using fuzzy-based Monte Carlo simulation
Authors: Moselhi Osama , Roghabadi Mohammadjavad Arabpour
Published: February 2020

Estimating cost contingency of construction projects depends largely on data captured from previous projects and/or experience and judgment of members of project team. Mote Carlo simulation is commonly used in estimating contingency, where its accuracy was reported to depend on number of iterations used in the simulation process, probability density functions associated with each project cost item being considered and the correlation among these cost items. The literature reveals that the latter is the most important issue for accurate estimate of contingency. It, however, requires the calculation of coefficients of correlation among cost items based on captured historical records of cost data. Subjective correlation was introduced to alleviate the difficulties associated with the calculation of these coefficients. This paper presents a newly developed method for cost contingency estimation that considers subjective correlations and allows for contingency estimation with and without computer simulation. Unlike the methods reported in the literature, the present method considers uncertainty associated with the coefficients of correlation and utilizes earlier work of the first author in calculating the variance of total project cost. It also allows for assessing the impact of variable covariance matrix on the estimated project cost using a simple and user-friendly computational platform. The application of the developed method on cost data captured from two databases demonstrates its use and accuracy in estimating cost contingency. The results are compared to those produced by others using Monte Carlo Simulation with and without correlation using an actual project data.
DETERMINATION OF VISCOSITY OF WILD MANGO (Irvingia gobonensis), HIBISCUS (Rosa sinensis) AND OKRO (Abelmoschus esculentus) AT DIFFERENT TEMPERATURES
Authors: Essien I. E. , Etuk, S. E. , Essiett, A. A. , Atat J. G. , Ekott E. E.
Published: February 2020

Viscosity is an important factor in fluid transport. It is a quantity that influences flow properties of fluid and quite useful food product designs. This study is aim at determining the viscosity of selected plant based materials, Wild mango, Hibiscus and Okro and to obtain a viscosity temperature model necessary to predict viscosity of these materials at various temperature values. The viscosity of these materials were determined using the volume flow rate method at a temperature range between 299k to 383k and the viscosity temperature model obtained from an empirical relationship. Wild mango exhibited the highest value of coefficient of viscosity at all temperature range with values between 18.3 x 10-3NSm-2 to 5.45 x 10-3 NSm-2 while Hibiscus and Okro have values of coefficient of viscosity ranging between 6.69 x 10-3NSm-2 to 1.82 x 10-3 NSm-2 and 8.05 x 10-3NSm-2 to 2.10 x 10-3 NSm-2 respectively. The coefficients of viscosity of these materials were found to decrease with increase in temperature. The viscosity temperature model obtained for wild mango, Hibiscus and Okro are , and respectively
KEY WORDS: Viscosity, temperature, Wild mango, Hibiscus, Okro
Study of American Literature in Perm University (Scientific Works by N. G. Byakova, I.V. Shikhova, E. P. Khanzhina, I. N. Klepatskaya)
Authors: Bratukhina
Published: February 2020

the article is a review of the most important scientific works (dissertations, monographs, several articles) that devoted to the literature of the USA, performed at the Department of Foreign Literature of Perm State University in the 80-th years of the XX century. The subject, structure, variety, scientific significance of publications by N. G. Byakova, I. V. Shikhova, I. N. Klepatskaya, E. P. Khanzhina are analyzed. The author notes the diversity of the direction of their research, and concludes about the features that unite the researchers of the "Perm school" of American studies: attention to the problems of typology of genres, attraction of the widest context of the phenomena under consideration, deep study of theoretical issues, system reflection of the laws of the development of the literary process.
Beekeeping practices and physicochemical properties of honey produced in Lerala village, Botswana
Authors: Bareki L
Published: February 2020

This study was conducted to evaluate the physicochemical properties of Apis mellifera honey produced in Lerala village and to assess the beekeeping practices. Sale of honey is an important source of income for beekeepers in Lerala village. There are two types of honeybee production systems in the study area: traditional backyard beekeeping and forest honey harvesting. A total of six honey samples obtained from two sources (modern hive and forest) were analysed for physicochemical properties following standard procedures. A semi-structured questionnaire was used to assess beekeeping practices by interviewing 15 individuals who have experience in beekeeping. The  average values for moisture content, total ash, free acidity, reducing sugars, sucrose, pH, water-insoluble solids and hydroxymethylfurfural of honey samples obtained from modern hives  were 18%, 0.24%, 31 meq/kg, 56.6%, 1.88%, 4.24, 0.05 g/100g and 26.6 mg/kg, respectively. The corresponding values for honey obtained from the forest were 17.7%, 0.28%, 27.7 meq/kg, 58%, 2%, 5.18, 0.07 g/100g and 10.9 mg/kg, respectively. Honey source significantly (P≤0.05) influenced the pH, reducing sugars and sucrose contents of the honey samples while ash, free acidity, water-insoluble solids and moisture content were not significantly (P>0.05) different between the two sources of honey. The pH, sucrose and reducing sugars content of forest honey samples were significantly (P≤0.05) higher than honey obtained from modern hives. All the parameters analysed were within the limits set by the Codex Alimentarius Commission for honey. The major challenges faced by beekeepers in the study area include lack of skills and knowledge of beekeeping, weak extension services and lack of bee handling and honey processing equipment. Thus, there is a need for training of beekeepers on improved beekeeping practices and provision of inputs such as modern hives and honey handling and processing equipment to farmers.
THE RESULTS OF STUDIES OF THE DEPENDENCE OF THE PERFORMANCE OF THE VIBRATING TWO-SHAFT CENTRIFUGAL MODULE ON THE MODE AND DESIGN PARAMETERS
Authors: Naduty Vladimir , Loginova Anastasia , Sukharev Vitaliy
Published: February 2020

The article presents a new design of a vibrating twin-shaft centrifugal module designed for grinding and classification of rock mass. In this design, in addition to grinding, the operation of classification or screening of the crushed mass was added, which does not allow its regrinding and increases the productivity of the device. This is achieved by installing in the bottom of the chamber grinding mesh with cells in accordance with the required class size. At the same time, the classification process is intensified by the presence of vibration from vibration exciters fixed on the camera body and the installation of the camera on elastic supports. The reciprocating horizontal vibrations of the chamber with a given amplitude and frequency contribute to the segregation of the crushed rock mass in the bed by size, which positively affects the efficiency of classification and grinding. The presence of vibration helps to unload the oversize product from the grinding chamber. Also, the article considers experimental studies performed on a vibrational two-shaft centrifugal module to determine the dependence of the performance of a given design on five variable factors: rotor shaft revolutions (n, rpm), size of the loaded rock mass (Δ, mm), rock mass strength (σ, kg/mm2), camera vibration frequency (ω, rpm) and its vibration amplitude (A, mm). Studies have shown the efficiency and increased productivity of the new design in relation to a centrifugal disintegrator without a classification grid and vibration. The results of the work allow us to recommend the design under study for the manufacture of an experimental sample according to the given initial requirements, and the established dependences (Q = f (n, Δ, σ, ω, A) make it possible to develop a mathematical model of the grinding process in this setup to calculate the required parameters.
INFLUENCE OF GEOMETRIC PARAMETERS OF THE TREATMENT SHOWER ON THE DEFORMATION CHARACTERISTICS OF THE SOIL WHEN FORMING A CAVITY FOR AN ANTI-FILTRATION SCREEN
Authors: Solona Olena , Kovbasa Vladimir
Published: February 2020

The article presents the results of studies of the interaction of the plowskin part of the mole farmer with soil. The purpose of the study is to determine the rates of relative deformations depending on its geometric and kinematic parameters. This will make it possible to determine the magnitude of the stress components and soil density functions that depend on these stresses. In addition, this will allow us to determine the strength of the soil resistance to the movement of the plow share of the mover.
The soil is presented in the form of a model of a viscoelastic medium in such a way that bigaromic potential functions can be used to analyze the interaction, since the final equations are reduced to a system of elliptic equations. Such a statement of the problem and its solution make it possible to obtain dependences of the relationship of the geometric parameters of the ploughshare part of the mover with the components of the strain rates of the soil, as well as the mechanical properties of the soil on the surface of its contact with the ploughshare. These expressions are the initial ones for the further determination of the components of stresses in the soil, which make it possible to determine the compaction of the soil on the walls of the formed cavity for drawing the anti-filter screen and the components of the resistance forces to the ploughshare.
Obtaining the final expressions of soil compaction on the molehill walls together with the dependences of the resistance forces will allow us to determine the geometric parameters of the working body, with various mechanical properties of the soil, to ensure the stability of the molehill walls with minimal energy consumption.
Such a solution is common for a certain class of problems on the interaction of the working body with the soil, which is represented by a deformable medium in order to determine the directions of changes in deformations or their velocities in order to use them to determine stress components that will allow you to find zones of possible plastic deformations and destruction of soil continuity.
PREPARATION OF TUFF IN THE DUMPS OF BASALT QUARRIES FOR VIBRATION SCREENING
Authors: Nadutyy Vladimir , Cholishkina Valentina , Sukharev Vitaliy , Malanchuk Zinovy
Published: February 2020

The article presents the current development of an integrated technology for the processing of tuff in the dumps of basalt pits to highlight the valuable metal fraction and silicate masses. In order to prepare tuff for processing, it is proposed to use the effect of moisture absorption and reduce the strength of tuff when moistened with water, since it has a porous structure and is relatively easy to absorb moisture. This operation, followed by vibratory screening in a small class of -2.5 + 2.0 mm, is promising for the selective extraction of tuff from dumps of basalt quarries, where, unlike other rocks, tuff is a water-absorbing mineral. The article presents the results of experimental studies and the development of mathematical models of the process of softening tuff with water. The objective of the research was to determine the degree of change in the strength of tuff under the influence of moisture and to establish the dependence of humidity and strength to predict the process of softening of tuff when wet. Experimental studies were carried out on various samples of tuffs of the Rafalovsky basalt quarry, while the exposure time of the sample in water was recorded, humidity, indenter indentation pressure on the press or contact load and compressive strength or contact stress during indenter penetration were determined. It was found that when moistening tuff during the day, humidity increases on average by 9%, strength decreases from 120.5 to 10.6 MPa and is 9.2% of the strength of the feedstock. Humidity of tuff in time increases according to the law of a quadratic parabola with a complex argument, the force of indentation of the indenter from moisture and wetting time changes according to the logarithmic law, strength from humidity and time - according to the law of the quadratic parabola. Also, the article proposes an algorithm for calculating humidity and strength characteristics during wetting during the day. It is advisable to use this technology of softening tuff with water as an ore preparation operation with the integrated technology of tuff processing.
EXPERIMENTAL RESEARCH ON THE DISTRIBUTION DYNAMIC PRESSURE OF THE CIRCULATION MOVEMENT OF THE WORKING ENVIRONMENT IN TOROIDAL MOBILE CONTAINERS
Authors: Yaroshenko Leonid
Published: February 2020

In the operation of vibrating process machines for machining parts with a bulk working medium in a vibrating container, individual particles of this medium carry out a chaotic movement, and the whole mass of the bulk medium performs a circulatory motion that has a dynamic effect on the surface of the workpiece in the form of the total impact of many micro-impact parts. However, the velocity of movement and the dynamic impact of the particles of the working medium are not the same in different zones of the container. The distribution of the dynamic pressure of the circulating motion of the working medium in the vibrating toroidal containers is of considerable practical interest in the development of the structures of such vibrating machines and the technological processes of their operation.
The distribution of the dynamic pressure of the working environment during the intersection of the toroidal container of vibrating technological machines with electromechanical drive and vertical unbalance shaft is experimentally investigated, which allows us to determine the most advantageous locations of the work pieces during their vibration treatment based on the conditions of efficiency and processing quality as well as maximum utilization of the kinetic energy of the circulating traffic of working environment when using it for additional forced movement on work pieces. Circulating movement creates the greatest dynamic pressure in the lower zones of the container, and as the distance from the surface of the container increases - dynamic pressure gradually decreases. The magnitude and nature of the distribution of the dynamic pressure of the working environment are also influenced by the direction of its circulation. When pressed by circulating movement of the environment to the outer cylinder of the working surface, ie to the points of the surface of the container having a large amplitude of vertical oscillations, the zone with high dynamic pressure is greater than in the case pressing it the inner cylinder of the working surface of the topper, that is, to the surface points of the container that have a smaller amplitude of vertical oscillations, thus reducing the absolute magnitude of the pressure.
ESTABLISHMENT OF CONDITIONS FOR EFFECTIVE ARRANGEMENT OF A CIRCLE WITH RESPECT TO A SQUARE AND AN EQUILATERAL TRIANGLE WITH A COMMON CENTER FOR ESTIMATING THE LENGTH OF THE LINE OF DISAGREEMENT
Authors: DUBCHAK Viktor
Published: February 2020

In this paper we investigate the question of the optimal, extreme (minimum) location of one plane figure, namely, the square in the first case, as well as the equilateral triangle in the second case relative to the circle with the common center of the said figures. In comparison with previous works, the analysis of studies of such a mutual effective location continues. But if in the previous results a function based on determining the value of an area over which the geometric figures did not match was calculated and investigated, then in these studies another numerical characteristic, such as a function, is proposed as such a criterion for the basic working function. which determines the length of the total polygon (straight or arc, etc.). For certain ratios of the radius of a circle with respect to the length of the side of a square or triangle, the length of the arc of the total line along which the discrepancy between the specified geometric objects is observed will take on an extreme (minimum) value. The optimality of such mutual arrangement of one figure relative to another is evaluated by such a criterion as the effective estimation of the length of the set of lines by which the divergence of these figures occurs. The value of a certain function, which determines the length of such sum of lines of divergence of figures in both cases, is obtained, the study of the extremality of this function is performed, it is shown that at the found extremum point, the function that determines the total length of the line of divergence of figures acquires a minimum value. A study of a function that establishes the entire length of the line over which the discrepancy of the figures is observed indicates, at the extreme, that the function acquires minimal values in the case of such arrangement of figures, when the circle is inscribed squarely or an equilateral triangle, and when described around these figures when such a function is maximized. Drawings are given for a better understanding of the formulation and solution of the task, conclusions are drawn, which summarize the values of the arguments sought when the corresponding function acquires minimum values.
STATIC CONDITIONS OF A LOOSE ENVIRONMENT IN SOLVING THE TASKS OF ITS VIBROMOVEMENT
Authors: Kaletnіk Grigory , Tsurkan Oleh
Published: February 2020

The method of formalizing a granular medium in the form of a continuous deformable
medium provides that the granular medium is continuous. In this case, the methods of
mechanics of continuous deformable media in Eulerian or Lagrangian coordinates are used. The method allows you to take into account the interaction between particles in the form of elastic, viscous or plastic components of internal resistance. With this formalization, the most widespread application of the Navier-Stokes equation. Unfortunately, the exact correct solution of such an equation in an analytical form does not exist.
It should be noted that the most common method is formalization in the form of a loose
discrete medium. It can be used under conditions when the dimensions of the element, in which the changes in the kinematic and dynamic parameters are determined, exceed by at least an order of magnitude the maximum size of a fraction of a granular medium. With this formalization, you can use the methods of mechanics of granular discrete
media.
When solving the problems of dynamics of motion of a loose discrete medium, it becomes necessary to compose the equations of its statics, which are necessary to solve the problems of dynamics. This is because the static equations allow one to supplement the boundary conditions and provide nonzero solutions for the problems of
oscillations of a loose discrete medium, since during oscillations of such a medium zero values of quantities determined (density and velocity components of displacements) can occur at points where their functions intersect the zero line relative to which oscillating motion occurs.
The article describes the conditions of the static state of a granular medium in a working chamber, which are an addition to the boundary conditions when solving the problems of oscillations of a granular discrete medium, which is formalized as continuous with a significant manifestation of dry friction.
Features of vibration mixers design
Authors: Olena Dzhedzhula
Published: February 2020

The article presents the results of the analysis of vibration mixers designs, presents their classification. The classification is based on the principle of action and the method of mixing. Practice has shown that mixing by vibration produces a significant effect. With vibrational mixing, all the expected components are evenly distributed throughout the volume of the mixture. The main disadvantage of the vibration method is the negative impact on the design of the mixer, as well as on the environment and humans.
The problems that complicate the design of vibration mixers include a wide range of physicomechanical properties of the mixed components, a significant difference in the concentration of the components of the mixtures. The advantages are the intensification of the mixing process, the possibility of more efficient mixing of materials with different physicochemical properties compared with other mixing methods, significant time savings on the process, and energy efficiency of vibration technologies. Three main categories of vibration mixers are distinguished by design features and the mixing method: vibration mixers with self-circulation of the mixture, vibration mixers with forced mixing with vibration effects on the components of the mixer, vibration mixers with free mixing with vibration effects on the components of the mixer. Based on the analysis, one can consider a perspective direction the design of vibration mixers of the first and second groups, increasing the efficiency of vibration mixers is possible through the introduction of the latest technologies and the use of modern materials. The creation of effective vibration exciters is one of the main tasks of improving the design of vibration mixers. A comparative analysis of vibration mixers with mechanical inertial, eccentric, electromagnetic, pneumatic, hydraulic and other types of vibration exciter is carried out. One of the promising directions for the design of vibration mixers is associated with the creation of effective vibration exciters with an amplitude controlled during operation.
INFLUENCE OF SMALL FRACTION OF POLYGRANULAR FILL OF ROTATING DRUM ON SELF-OSCILLATION SWING
Authors: Kateryna Deineka
Published: February 2020

The influence of the structure of two-fractional polygranular fill of a rotating drum on the self-oscillation swing is considered. The pulsating mode of flow of such intrachamber fill is used in the self-oscillating grinding process in a tumbling mill. Spherical particles of non-coherent granular material of 2.2 mm size were used as a large fraction modeling the grinding bodies. Cement was used as the small fraction modeling the particles of the crushed material. The factors of experimental studies were accepted: the gaps between particles of large fraction degree of filling at rest dispersed particles of small fraction 0, 25, 50 and 100%, the relative size of particles of large fraction in the drum chamber 0.519, 0.733, 1.04, 1.47, 2.08, 2.93, 4.15 and 5.87% (drum chamber radius 212, 150, 106, 75, 53, 37.5, 26.5 and 18.75 mm), the chamber degree of filling at rest 25, 35 and 45%. The method of visual analysis of fill motion patterns in the cross section of a rotating chamber and measurement of dilatation was applied.Video of the fill pulsating flow was taken. The magnitude of the self-oscillation swing was estimated by the increase in the difference of the maximum and minimum values of the fill dilatation over one period of pulsating. The maximum range of self-oscillation swing reached the value of 1.36. The change of the self-oscillation swing from zero at the beginning of self-excitation of pulsations to the maximum value with the greatest increase of dilatation was revealed. The effect of a decrease in the maximum range of self-oscillation swing with enhanced fill coherent properties has been registered. The attenuation of the spray of particles of large fraction in the chamber due to the coherent effect of the small fraction was established. An increase in the self-oscillation swing of single-grain fill was found with a decrease in the relative particle size and the chamber degree of filling. A decrease in the self-oscillation swing of two-fractional fill was found with an increase in the content of small fraction, a decrease in the relative size of particles of a large fraction, and an increase in the chamber degree of filling.
RATIONALE FOR THE NEEDLE DISC DESIGN OF A ROTARY HARROW WITH THE ANALYSIS OF THE STRUCTURE OF THE BODY OF A BIOLOGICAL ANALOGUE
Authors: Vitaliy Yaropud , Borys Volyk
Published: February 2020

Modern agricultural production persistently requires solving the problems of increasing crop yields, preserving the effective and potential soil fertility on the basis of resource-saving soil-protective technologies that provide complex mechanization of all technological operations with a significant reduction of energy costs. Of particular relevance is the problem of reducing or completely eliminating the proportion of manual labor when performing the most time-consuming technological operations.

A significant reserve for improving the efficiency of land use, increasing the yield of crops is the reduction of time and a significant improvement in the quality of technological operations of tillage.

Known tools with needle working bodies, intended for early spring, pre-sowing and harvesting small surface loosening of stubble background in areas with soils that are prone to wind erosion, are inefficient, and increasing their speed leads to a sharp decrease in quality.

Crop productivity is the result of the interaction of many factors and conditions, the most important of which are: soil fertility, nature of plants, soil and climatic conditions and mechanized tillage technology. The current level of crop culture requires the search for new resource-saving technologies and machines that fully meet the agrobiological requirements of cultivated plants. In this regard, there is a need to rationalize the use of surface tillage, increase their fertility, as well as protection against erosion.

The results of researches of the designs of machines and technologies of surface tillage showed that on the slope lands the most promising is the reception of tillage with leveling of the surface and creation of a micro-cellular structure of the bottom of the loosened layer with fulfillment of all agrotechnical requirements.

On the basis of the analysis of the body of the hedgehog, the elements of functional identification with the rotary harrow disc needle are substantiated. The possibility of adopting the needle control mechanism structure as a biological analogue of the mechanism of elastic attachment of needles to the disc of the harrow has been proved. The design of a disk and variants of execution of needles is offered.
DEVELOPMENT AND RESEARCH OF SOIL MACHINE FOR STRIP-TILL TECHNOLOGY WITH ACTIVE MILLING WORKING BODIES
Authors: Leonid Sereda , Elena Trukhanska , Ludmila Shvets
Published: February 2020

One of the achievements in the field of growing crop products is the development and implementation of the latest low-cost No-till and Strip-till technologies. On the positive side of these technologies, overnight economic efficiency there are other advantages over industrial technology: the conservation and improvement of soil and environmental indicators, such as the prevention of erosion. Against the introduction of these technologies, there are factors of staff unpreparedness, as well as the availability of expensive special equipment.
Most scientists in the field of agronomy, especially abroad, when new No-till and Strip-till technologies appeared, called them revolutionary in crop production, since along with economic indicators, these technologies preserve the fertile potential of the soil. This is achieved due to less soil damage due to the minimum number of technological operations, as well as the mandatory coverage of the field with plant residues after harvesting. Strip-till technology is most suitable for our area.
The essence of this technology lies in the fact that soil cultivation is carried out selectively, with a strip width of 25-30 cm, and between them there remains untreated strips of 30 cm also, covered with the remains of the crop that was previously harvested. Given the relevance of the topic, this article provides specific material for the study of a tillage machine with active working bodies in the form of mills. The development is based on the well-known agricultural machine, milling cultivator KF-3.6.
The essence of the modernization lies in the fact that the milling heads are placed for processing strips, in front of which there are plane-cutting legs, and behind them are special disks for forming the strip. The main disadvantage of the existing machine is the presence of a bulky drive, which consists of three gearboxes, cardan gears.
In this paper, we consider the option of replacing the drive with a more modern and reliable hydraulic drive.