scholarly journals Investigation of the influence of the length of the intermediate magnetic circuit on the characteristics of magnetic gripper for robotic complexes of the mining industry

2020 ◽  
Vol 241 ◽  
pp. 46 ◽  
Author(s):  
K. Krestovnikov ◽  
E. Cherskikh ◽  
A. Saveliev
Keyword(s):  
Magnetic Circuit ◽  
Adhesion Force ◽  
Mining Industry ◽  
Statistical Processing ◽  
Random Variable ◽  
Magnetic Core ◽  
Hard Magnetic Materials ◽  
Energy Expenditures ◽  
Operating Environments ◽  
High Degree

The analysis of the existing systems of mechanical grippers of various operating principles and operating environments, in the design of which both soft and hard magnetic materials are executed. The characteristics of existing prototypes are shown and the results of our own research are presented.The article presents a study of the effect of the intermediate magnetic circuit length on the characteristics of magnetic gripper, the principle of which is based on the control of the field of a permanent magnet. The gripper based on this principle of action does not require constant energy expenditures to maintain both on and off states.The description of the magnetic gripper design and the design of the test bench is given, as well as the results of a series of experiments to determine the strength of the release of the gripper at different lengths of the magnetic circuit in the on and off states, followed by statistical processing of the data. The intervals of the ranges in which with a high degree of probability there will be a value of the gripping disengagement force for various lengths of the intermediate magnetic circuit are identified. The nature of the distribution of a random variable, which is the force of decoupling of the gripper, is determined. The dependences of the gripper decoupling force on the length of the intermediate magnetic circuit for each of the gripper states are constructed. It has been established that a decrease in the length of the intermediate magnetic circuit is the cause of a decrease in the gripping adhesion force. Plots of the dependence of the gripper decoupling force were constructed using the modes of the force values varieties to visually display the experimental results. The maximum adhesion force of magnetic pickup – 9.5 kg – was achieved with an intermediate magnetic core length of 50 mm, the minimum with a length of 25 mm – 5.6 kg.  

TO STUDY THE DYNAMICS OF IMMUNITY IN BLACK-AND-WHITE COWS DEPENDING ON AGE

2020 ◽  
pp. 49-52
Author(s):  
М.В. ДОВЫДЕНКОВА
Keyword(s):  
Bactericidal Activity ◽  
Phagocytic Activity ◽  
Physiological State ◽  
Age Groups ◽  
Statistical Processing ◽  
Natural Resistance ◽  
Black And White ◽  
Feeding Methods ◽  
High Degree ◽  
The Relationship

Проведена статистическая обработка сформированной базы данных показателей неспецифической резистентности MS «Excel» с целью изучения динамики иммунитета по параметрам бактерицидной, лизоцимной и фагоцитарной активности у крупного рогатого скота черно-пестрой породы разных возрастов. Было установлено, что средние значения показателей лизоцимной и бактерицидной активности у телят в 6 мес были ниже (47,89% и 49,09%, соответственно), чем у животных в 3—4 года (53,75% и 52,81%). Выведено уравнение регрессии, описывающее взаимосвязь между средними показателями фагоцитарной активности и возрастом при высокой степени достоверности (R2=0,90). Изменения лизоцимной и бактерицидной активности в зависимости от возраста были недостоверными (R2=0,58 и R2=0,49, соответственно). Установлена высокая корреляция между бактерицидной и лизоцимной активностью. Отмечена динамика изменения неспецифического иммунитета у коров различных возрастных групп. Создание баз данных и постоянный мониторинг основных показателей естественной резистентности в зависимости от различных факторов (породы, возраста, стадий лактации, кормления, способов содержания), которые влияют на данные показатели, необходимо для оценки физиологического состояния организма животных и их устойчивости к болезням. Statistical processing of the generated MS "Excel" on indicators of non-specific resistance database was carried out with the aim of studying the dynamics of the development of immunity in terms of bactericidal, lysozyme and phagocytic activity in black-and-white cattle of different ages. It was found that the average values of indicators of lysozyme and bactericidal activity in calves at 6 months were lower (47.89% and 49.09%, respectively) than in animals at the age of 3—4 years (53.75% and 52.81%). The equation of regression was derived, it describes the relationship between the average indicators of phagocytic activity and the age with a high degree of reliability (R2=0.90). The changes in lysozyme and bactericidal activity depending on age were dubious (R2=0.58 and R2=0.49, respectively). The high correlation between bactericidal and lysozyme activity was established. It was noticed that the cows of different age groups experienced the dynamics of changes in nonspecific immunity. The creation of databases and constant monitoring of the main indicators of natural resistance, depending on various factors (breed, age, stages of lactation, feeding, methods of keeping) that affect these indicators, is necessary for assessing the physiological state of the animals’ body of and their resistance to diseases.

scholarly journals QUALITY ASSESSMENT, SPECIFICS OF ORGANIZATION AND PROVISION OF MEDICAL CARE TO STROKE PATIENTS ACCORDING TO THE HOSPITAL REGISTER OF VRCPH NAMED AFTER ACADEMICIAN O. I. YUSHCHENKO OF VRC AND VCCH EMS FOR THE PERIOD 2017-2019

World Science ◽  
2020 ◽  
Vol 2 (6(58)) ◽  
pp. 32-37
Author(s):  
Moskovko Serhiy Petrovych ◽  
Fiks Dmytro Oleksandrovych ◽  
Shayuk Alla Volodymyrivna ◽  
Cherkasova Lyubov Anatoliyivna
Keyword(s):  
Medical Care ◽  
Statistical Processing ◽  
Multidisciplinary Care ◽  
Medical Documentation ◽  
Diagnostic Process ◽  
Positive Trend ◽  
Stroke Treatment ◽  
Medical Institutions ◽  
Medical Diagnostic ◽  
High Degree

Currently, one of the most important tasks is to improve the quality of medical services, which becomes possible in retrospective register analysis of medical and organizational technologies, which include algorithms for providing medical care, continuity of medical institutions, protocols for diagnosis and treatment of diseases. The stroke register was created on the basis of medical documentation of hospitals, which are the most typical for the Podillia region of Ukraine. Statistical processing of the results was performed using the licensed statistical package "Statistica 5.5" using parametric evaluation methods. Significant differences in the organization of the medical-diagnostic process and approaches to treatment have been established between the two medical institutions of Vinnytsia in the dynamics of time. There was a positive trend in the time of stroke treatment, the use of drugs with a high degree of evidence and the coverage of patients with specialized, multidisciplinary care in a stroke

scholarly journals Geological Reserve Estimation of Limestone Deposit: A Comparative Study Between ISDW and OK

2020 ◽  
Vol 81 (1-4) ◽  
pp. 72-77
Author(s):  
Manas K. Mallick ◽  
Bhanwar S. Choudhary ◽  
Gnananandh Budi
Keyword(s):  
Linear Method ◽  
Mining Industry ◽  
Mine Planning ◽  
Reserve Estimation ◽  
Time Saving ◽  
Ore Deposit ◽  
Grade Estimation ◽  
Planning Software ◽  
Distance Weighting ◽  
High Degree

Geostatistics plays an important role for reserve estimation in mining industry. Geostatistical tools became popular because of its high degree of accuracy and time saving process for estimation. The uncertainty of geological deposit can be populated by geo-statistical tools. The limestone ore deposit was studied in this paper. The assay value of individual constituents of limestone ore i.e CaO, SiO2, Al2O3 and Fe2O3 were determined for a block by using Inverse Square Distance Weighting (ISDW) method. The average assay value of those individual constituents were 45.85, 15.94, 1.56 and 0.82 percentage respectively. The assay value of CaO was also estimated by two linear method of estimation i.e ISDW and Ordinary Kriging (OK). The assay value of CaO were determined 45.85 and 44.67 percentage respectively. The assay values were properly validated and concluded accordingly. The application of ISDW and OK were implemented to build the resource model together in order to assess the uncertainty of the deposit. Grade estimation by using different geo-statistical techniques are done by SURPAC mine planning software.

Circuit Model of Nonlinear Inductor with Magnetic Core Based on Duality Theory

2012 ◽  
Vol 614-615 ◽  
pp. 1344-1347
Author(s):  
Guang Yang
Keyword(s):  
Topological Structure ◽  
Duality Theory ◽  
Magnetic Circuit ◽  
Magnetic Core ◽  
Circuit Model ◽  
Model Based ◽  
Simulation Results

A circuit model of nonlinear inductor with magnetic core based on duality theory is presented in this paper. The presented circuit model of the nonlinear inductor can reflect the magnetic circuit topological structure of the magnetic core very well. The circuit model of the nonlinear inductor based on duality theory was implemented in the PSCAD software for verification. The transient temporal simulation was made at 50 Hz and 500 Hz. The validation of the circuit model based on duality theory has been verified by comparing the simulation results obtained by PSCAD software and ANSOFT software.

Design and experimental study of the porous foam metal magnetorheological fluid damper based on built-in multi-pole magnetic core

2020 ◽  
Vol 31 (5) ◽  
pp. 687-703 ◽  
Author(s):  
Dan Zhao ◽  
Jianbin Zhao ◽  
Zhenghang Zhao ◽  
Yang Liu ◽  
Shaogang Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Circuit ◽  
Magnetorheological Fluid ◽  
Effective Area ◽  
Magnetic Core ◽  
Damping Force ◽  
Output Performance ◽  
Magnetorheological Fluid Damper ◽  
Fluid Damper ◽  
Foam Metal

The porous foam metal magnetorheological fluid damper has a broad application prospect in the field of vibration isolation of precision instruments with small damping force because it does not need complex dynamic seal structure. The traditional single-ring magnetic pole porous foam metal magnetorheological fluid damper has a small effective area for the magnetic core that affects the damper output range due to the geometric constraints of the coil and the low magnetic field utilization. Therefore, in order to increase the effective area ratio of the magnetic core, this article introduces the built-in multi-pole magnetic core into the porous metal magnetorheological fluid damper and integrates four axial wound fan-shaped magnetic poles on the magnetic core to improve the output performance of the damper. The magnetic circuit is analyzed based on Ohm’s law of magnetic circuit, and the mathematical model of damping force is established. Based on this, the important geometric parameters of the damper are determined. The finite element method is used to simulate the magnetic field of the damper, and the output performance of the damper is numerically simulated. The dynamic performance test system of the damper is set up to test the designed damper, and the test data and numerical simulation results are verified with each other. The results show that the damping force peak and dynamic regulation range of the damper designed in this article are higher than those of the traditional porous foam metal magnetorheological fluid damper with magnetic core, which effectively improves the mechanical properties of the magnetorheological fluid damper with porous foam metal.

scholarly journals TO THE STATISTICAL ANALYSIS OF SOIL SHEAR TESTS RESULTS

2020 ◽  
Vol 11 (3) ◽  
pp. 8-17
Author(s):  
A. M Karaulov ◽  
K. V Korolev ◽  
L. A Bartolomey ◽  
E. P Bragar
Keyword(s):  
Normal Distribution ◽  
Sandy Loam ◽  
Statistical Processing ◽  
Sandy Soils ◽  
Random Variable ◽  
Soil Strength ◽  
Strength Characteristics ◽  
Shear Tests ◽  
Strength Parameters ◽  
Distribution Law

The result of any shear tests, which are the most popular laboratory methods for determination the strength characteristics of soils, is a set of values of the ultimate shear resistance and the corresponding normal pressure along the shear section. The theoretical background for the analysis of the soil shear tests results is the theory of probability and mathematical statistics. At the same time, we have questions about the determination of the calculation values of soil strength parameters. So, during the processing of shear tests results according to a consolidated-drained scheme for sandy soils the calculation values of soil specific cohesion are often negative, which is incorrect. The article considers an example of processing of shear tests data of sandy loam for various normal pressures, and analyzes the results of statistical processing of soil tests. The normative methods for probabilistic assessment of soil strength characteristics are based on using of normal distribution law of a random variable. It is assumed that the valuesof a random variable can vary from -¥ to +¥, while the soil strength parameters can vary in a limited range, i.e. accept only positive valuesfrom 0 to +¥. This circumstance does not matter for the majority of clayed soils, which strength parameters are far enough from zero. However, it has a significant effect on the result for small sought-for values, particularly, in assessing of specific cohesion for sandy soils. Therefore, for such cases, the article presents a variant of the statistical processing of the shear tests results with using the reduced normal distribution law of a random variable.

scholarly journals Differential Evaluation of Crew Functional Effectiveness

2017 ◽  
Vol 4 (1) ◽  
pp. 88-95
Author(s):  
Viktors Feofanovs
Keyword(s):  
Theoretical Model ◽  
Functional Performance ◽  
Probabilistic Approach ◽  
Statistical Processing ◽  
Objective Evaluation ◽  
Operator Training ◽  
Evaluation Standards ◽  
New Approach ◽  
Differential Evaluation ◽  
High Degree

Abstract The aim of this article is the development of the system and methodology of complex control and evaluation of vehicle operators performance during multifunctional simulation. In order to achieve the above-stated aim it is necessary to solve the following principal tasks: to elaborate a theoretical model of differentiated evaluation of vehicle operator training degree according to different kinds of their functional performance; to develop the method of the differential evaluation of crew performance on full-scale aviation simulators with due consideration of the probabilistic approach on the basis of statistical processing of the data of recorded flight information. The offered theoretical model of the differential evaluation of operator performance and the methodology of standards determination developed on its basis represent a new approach to the creation of automated systems for the objective evaluation of the trainees’ qualification degree. The elaborated system of differential evaluation standards ensures a high degree of objectiveness when evaluating the degree of the vehicle operator qualification and makes it possible to carry out a comparative analysis of the operators’ qualification.

scholarly journals Land Cover Change and Landscape Transformations (2000–2018) in the Rural Municipalities of the Upper Silesia-Zagłębie Metropolis

2020 ◽  
Vol 12 (23) ◽  
pp. 9911
Author(s):  
Katarzyna Pukowiec-Kurda ◽  
Hana Vavrouchová
Keyword(s):  
Land Cover ◽  
Rural Areas ◽  
Arable Land ◽  
Mining Industry ◽  
Upper Silesia ◽  
Metropolitan Regions ◽  
Mining Areas ◽  
Rural Municipalities ◽  
High Degree ◽  
Landscape Transformations

Dynamic changes in the landscape have been observed in recent years. They are particularly visible in areas with a high degree of anthropopressure. An example of such areas is metropolitan regions and their immediate rural surroundings. The purpose of this article is to identify changes in land cover in the rural municipalities within metropolises and detect the processes of landscape transformation in rural areas, which are extremely sensitive to anthropopressure. The dynamics of land cover changes in the years 2000–2018 were determined using a change index (ChI), and their directions were determined using the indicator of changes in types of land cover. Corine Land Cover for level 2 groups (1.1–4.2) was used as research material, and the Upper Silesia-Zagłębie Metropolis was selected as the model area. The greatest changes in the landscape were observed in built-up areas, industrial areas, meadows and mining areas. This is due to the disappearance of the mining industry that was traditional for this region and the ongoing suburbanization process, as well as the re-industrialization of modern industry and the abandonment of arable land in rural areas.

scholarly journals The measurement of magnetic saturation intensities at different temperatures

1939 ◽  
Vol 170 (943) ◽  
pp. 551-560 ◽  
Keyword(s):  
Magnetic Materials ◽  
Systematic Investigation ◽  
Magnetic Characteristics ◽  
Hard Magnetic Materials ◽  
Fundamental Properties ◽  
Starting Point ◽  
Different Temperatures ◽  
The Moment ◽  
High Degree ◽  
The Magnetic Field

The magnetic properties of alloy systems have assumed increasing importance in recent years. In view of the extreme complexity of the different magnetic characteristics of these alloys, it is evident that a consideration of the more fundamental properties constitute the essential starting point for a systematic investigation. Whilst the behaviour in low magnetic fields may depend largely upon thermal and mechanical treatment, the intensity is known to show less variation, particularly if sufficiently high fields are employed. In the case of many so-called “hard” magnetic materials, however, some thousands of gauss are necessary to produce complete alinement of the elementary domains. If, further, only small quantities are available, the magnetic field required to overcome the shape factor and saturate the material makes the use of an electromagnet essential. The intensity must be measured over a range of temperatures up to the Curie point, so that the variation in the moment of the elementary magnets accompanying a change in structure can be followed. None of the existing methods appears suitable for rapid measurements on a large number of magnetic materials. A new method has been developed capable of measurements on a few cubic millimetres of substance to a high degree of accuracy at any temperature, and it seemed worth while to deal with it in a separate communication.

Sign in / Sign up

Export Citation Format

Share Document