scholarly journals OPTIMIZATION OF CUT BRAKING MODES ON THE GRAVITY HUMP

2021 ◽  
pp. 28
Author(s):  
A. DOROSH
Keyword(s):  
Research Work ◽  
Complex Method ◽  
Main Task ◽  
Safety Requirements ◽  
Stage Of Development ◽  
Automation Systems ◽  
Sorting Process ◽  
Minimum Interval ◽  
The Hill

Purpose. At the stage of development of modern information systems for controlling the process of breaking up trains on the humps, the main task is to determine such conditions for cuts' rolling, under which the established safety requirements for breaking up, as well as the requirements for the safety of wagons and cargo in them, are fulfilled. The determination of such rolling modes is undoubtedly a rather complex optimization problem, the solution of which is being addressed by a large number of scientists. In this regard, it can be considered that this problem remains relevant, therefore, the purpose of this research work is to determine such modes of braking of cuts of the train, which ensure their reliable separation when rolling from the top of the hill to the sorting tracks. Methodology. To carry out research on the process of dismantling trains on the hump, the method of simulation was used, and to search for the braking modes of the cuts of the calculation group, the Box complex method was used. Findings. The conditions for separating cuts of the calculated group of the train were investigated, and an iterative procedure was developed to optimize the braking modes of all the cuts of the train, which makes it possible to ensure the maximum value of the minimum interval in the calculated group. In this case, the specified procedure takes into account the intervals between the cuts, both on the arrows and on the retarders of the brake positions of the downhill part of the hill. Originality. It has been established in the work that when determining the modes of braking the cuts of the train, it is necessary to take into account the possible separation of the cuts on all elements of the downhill part of the hill - arrows and retarders. The problem of finding the optimal braking modes for all cuts of the train has been formalized and solved, which, in turn, allow providing reliable conditions for separating adjacent cuts at the turnouts and brake positions of the downhill part of the hill.  Practical value. The developed method can be used in the study of the sorting process, as well as in the automation systems for disbanding trains on the hump when determining the braking modes of the cuts.

scholarly journals Using the plantography method in the study of medical and biological disciplines

2019 ◽  
Vol 2019 (4 (129)) ◽  
pp. 150-156
Author(s):  
Anatoly Bosenko ◽  
Larisa Evtukhova
Keyword(s):  
Research Work ◽  
Qualitative Evaluation ◽  
Risk Groups ◽  
Complex Method ◽  
Human Foot ◽  
Research Activities ◽  
Medical Groups ◽  
Foot Arch ◽  
Group A

The learning process includes a variety of research methods, varying degrees of complexity and importance, which are required by a person in a variety of spheres of life. The article scientifically substantiates the use of a complex method of plantography in the process of teaching biomedical disciplines to determine the functional parameters of the human foot arch. Application of the plantography method in practical classes of the discipline "Human Physiology" will increase interest in learning, since the determination of individual state parameters of the musculoskeletal system will allow students not only to expand the range of knowledge of the physiological profile, but also to develop their skills of research conduct. In the course of our research, the indicators of the condition of students’ foot arch in different modes of loading were identified. The analysis of the results allowed us to determine the so-called "risk group": a group of students who under the influence of the load demonstrated static forms of deformation of the foot arch, while there is a transition of the foot index from one qualitative evaluation zone to another, from "normal" to the category: "flattened", "slightly flattened" and "flat". Therefore, increasing the load on the foot arch leads to a decrease in its springing capabilities. Thus, the data of individual parameters of the foot index obtained by students during the research work in practical classes can contribute to the correct distribution of students in medical groups for physical education. Keywords: plantography, human foot arch, risk groups, research activities.

The New Swedish Cyprus Expedition 2010. Excavations at Dromolaxia Vizatzia/Hala Sultan Tekke. Preliminary results

2011 ◽  
Vol 4 ◽  
pp. 69-98 ◽  
Author(s):  
Peter M. Fischer ◽  
Patrik Klingborg ◽  
Fanny Kärfve ◽  
Fredrika Kärfve ◽  
C. Hagberg ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
Main Task ◽  
Phase 2 ◽  
The North ◽  
12Th Century ◽  
Area 6 ◽  
Recent Phase ◽  
The Rich ◽  
Ground Penetrating

Determination of the complete occupational sequence of the site, including investigation of pre-12th century levels which were thoroughly studied by P. Åström since the 1970s, is the main task of the planned project. During the course of the expedition (NSCE11) in spring 2010 a ground-penetrating radar survey (GPR) was carried out at Dromolaxia Vizatzia/Hala Sultan Tekke in Area 6, leading to the discovery of a large Late Cypriote complex. The compound is bordered to the north by a substantial wall, against which nine rooms (so far) could be exposed. Two occupational phases have been verified but there are indications of a third. The suggested functions of the various structures of the most recent phase are: living, working, storage and administration spaces. The rich find contexts point to the production of textiles and metal objects, and the locally produced pottery is generally of a high quality. There are also many imports, mainly from the Mycenaean sphere of culture. The locally produced vessels from Phase 2 include the “Creature krater” which is a masterpiece of a high artistic standard. Another piece of elevated artistry is the piece of a “Warrior vase”.

Preliminary Studies on the Determination of FLD for Single Point Incremental Sheet Metal Forming

2012 ◽  
Vol 504-506 ◽  
pp. 863-868 ◽  
Author(s):  
Miklos Tisza ◽  
Péter Zoltán Kovács ◽  
Zsolt Lukács
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
New Technologies ◽  
Single Point ◽  
Research Work ◽  
Dimensional Accuracy ◽  
Forming Limit ◽  
Incremental Sheet Metal Forming

Development of new technologies and processes for small batch and prototype production of sheet metal components has a very important role in the recent years. The reason is the quick and efficient response to the market demands. For this reasons new manufacturing concepts have to be developed in order to enable a fast and reliable production of complex components and parts without investing in special forming machines. The need for flexible forming processes has been accelerated during the last 15 years, and by these developments the technology reaches new extensions. Incremental sheet metal forming (ISMF) may be regarded as one of the promising developments for these purposes. A comprehensive research work is in progress at the University of Miskolc (Hungary) to study the effect of important process parameters with particular emphasis on the shape and dimensional accuracy of the products and particularly on the formability limitations of the process. In this paper, some results concerning the determination of forming limit diagrams for single point incremental sheet metal forming will be described.

Determination of Heat Input in Tungsten Inert Gas and Laser Welding of Type Optim 960 QC Structural Steel Using Adams’ Equation for 2-D Heat Distribution

2017 ◽  
Vol 750 ◽  
pp. 45-52
Author(s):  
Sveto Cvetkovski
Keyword(s):  
Laser Welding ◽  
Heat Input ◽  
Arc Welding ◽  
Research Work ◽  
Laser Beam Welding ◽  
Peak Temperature ◽  
Efficiency Coefficient ◽  
Zone Recrystallization ◽  
Welding Processes

The heat input during conventional arc welding processes can be readily calculated knowing the power taken from the power source. The efficiency coefficient can be taken from the appropriate literature standards. Here, the intention of the performed research work was to develop a procedure for determination of heat input in arc and laser welding processes implementing Adams equation - modified Rykalin equation for two dimensional heat distributions (2-D). To realize this idea, it is necessary to determine two characteristic temperatures points in the HAZ with known peak temperature, and to determine distance between them. Implementing measured values for distance in Adams’ equation, heat input in arc welding can be directly determined in arc welded joints.In laser beam welding, the absorption of the beam in the metal is not known, so that the welding heat input cannot be calculated directly, and direct implementation of Adam’s equation is not possible i.e. absorption coefficient has to be determined first, and after that calculation of heat input is possible.The peak temperatures corresponding to specific microstructures can be obtained by performing welding simulation, by the Gleeble 1500 simulator in our case. As one of the peak temperatures, the melting temperature can be used corresponding to the fusion line, so that at least one characteristic peak temperature such as coarse grain zone, fine grin zone, intercritical zone, recrystallization, has to be determined by the simulation.Performed research showed that obtained values for heat input using Adam’s equation correspond pretty well with standard equation for heat input in arc welding.

Determination of the minimum suppressive concentration of photosensitizers of the second generation in relation to sanitaryindicative microorganisms

2021 ◽  
Vol 1 (11) ◽  
pp. 42-46
Author(s):  
Vadim Yu. Shlenskiy ◽  
◽  
Tatiana I. Pashnik ◽  
Svetlana Yu. Pigina ◽  
◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Salmonella Enteritidis ◽  
Second Generation ◽  
Research Work ◽  
Protoporphyrin Ix ◽  
Bactericidal Effect ◽  
Disodium Salt ◽  
Bacterial Cultures

In the studies described in the article, the presence of antimicrobial activity in photosensitizers in experiments on bacterial cultures was confirmed. In the experiments, photosensitizers of the second generation were used: «Photoditazine», the active substance of which is dimeglumin chloride E6, and «Dimegin», which includes a derivative of protoporphyrin IX-2,4-di(1-methoxyethyl)- deuteroporphyrin IX disodium salt. In the described research work, the minimum concentrations of the studied drugs were determined by the method of sequential tenfold dilutions to obtain a bactericidal effect on strains of sanitary-indicative microorganisms Enterococcus faecalis, Staphylococcus aureus, Salmonella enteritidis.

Determination of total and residual nitrogen in normal and pathologically altered skin in various skin and venereal diseases

1936 ◽  
Vol 32 (12) ◽  
pp. 1500-1500
Keyword(s):  
Healthy People ◽  
Main Task ◽  
Venereal Diseases ◽  
Residual Nitrogen ◽  
Quantitative Content

Before embarking on the implementation of their main task, the authors preliminarily studied the quantitative content of nitrogen in the skin and blood in rabbits and healthy people

Novel Determination of Anti-Hypertensive Combination; Benidipine Hydrochloride and Nebivolol Hydrochloride by High Performance Chromatographic Method

2021 ◽  
pp. 5433-5438
Author(s):  
V.L.N. Balaji Gupta Tiruveedhi ◽  
Venkateswara Rao Battula ◽  
Kishore Babu Bonige ◽  
Tejeswarudu B.
Keyword(s):  
High Performance ◽  
Degradation Products ◽  
Research Work ◽  
Hplc Method ◽  
Assay Method ◽  
Injection Quantity ◽  
Relative Standard ◽  
Nebivolol Hydrochloride ◽  
Concentration Series

This research work was designed to establish and validate a novel stability indicating RP-HPLC method for the combined determination of Benidipine hydrochloride (BHE) and Nebivolol hydrochloride (NHE) in bulk and tablets, dependent on ICH guidelines.The assay method to analyse BHE and NHE was optimized with isocratic elution using acetonitrile: 0.1M acetate buffer (45:55, pH 5.1), Lichrospher ODS RP-18 column and flow pace of 1 ml/min. Total time for single run was 14 min. The injection quantity was 20μl, and was detected at 249nm. The method was verified on a concentration series of 1.25-10μg/ml (NHE) and 1.0-10μg/ml (BHE) for precision, accuracy and linearity. The LOD values were 0.059µg/ml and 0.028µg/ml for NHE and BHE, respectively. The LOQ values were 0.196µg/ml for NHE and 0.094µg/ml for BHE. The recovery percentages were 98.60-100.11% (BHE) and 98.94-101.50% (NHE) with relative standard deviation 0.250-0.694% (BHE) and 0.183-0.400% (NHE). The method was also observed to be efficient, and was sufficiently specific to measure BHE and NHE in the presence of stress-produced degradation products.

scholarly journals Diagnostic possibilities of accurate determination of the time since death on the concentration of electrolytes in the vitreous body of the human eye

2021 ◽  
pp. 79-85
Author(s):  
Yuliia Sarkisova
Keyword(s):  
Accurate Determination ◽  
Vitreous Body ◽  
Statistical Processing ◽  
Test Material ◽  
Main Task ◽  
Time Since Death ◽  
Exclusion Criteria ◽  
Cardiovascular Pathology ◽  
Human Eye

In this paper the results of modern scientific researches are analyzed and the possibilities of the method of establishing the amount of K+ and Na+ in the vitreous body (VB) of a person for solving problems of practical forensic medicine are studied. The aim of the work. To investigate the possibilities of accurately establishing the time since death (TSD) by determining the amount of electrolytes (K+ and Na+) of human VB. Materials and methods. VB samples from 120 deaths due to cardiovascular pathology (exclusion criteria: eyeball injuries, traumatic brain injury, exogenous intoxications) were studied. The study of the test material was performed on an analyzer of electrolytes and gases ROCHE COBAS B121. The main task was to analyze and establish the dependence of the change in the amount of K+ and Na+ of the VB on the TSD. Statistical processing of the obtained results was performed using Statistica software. Results. In all cases, on average in the first 6 hours, its amount was 7,4 mmol/l, after 6-12 hours – 9,8 mmol/l, after 12-18 hours – 12,1 mmol/l, after 18-24 hours – 16,5 mmol/l, after 24-36 hours – 20,2 mmol/l, after 36-48 hours – 25,3 mmol/l. The amount of Na+ ranged from 120 to 200 mmol/l. Conclusions. It is established that the number of electrolytes of the VB of the human eye naturally changes with increasing postmortem interval, which allows to use this technique to determine the TSD. In particular, the accuracy of setting the DNS by the number of K+ – 4-6 hours between 1 and 18 hours after death. There is an increase in the range of accuracy at a later date of the TSD.

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