scholarly journals Defining the rational installation position for the discharging unit of the bucketless rotary imple-ment in the trenching excavator

2021 ◽  
pp. 118
Author(s):  
Vladimir Musiiko ◽  
Andrii Koval ◽  
Oleksandrа Olieinikova
Keyword(s):  
Analytical Methods ◽  
Continuous Flow ◽  
Force Analysis ◽  
Basic Principles ◽  
Flowing Medium ◽  
Scientific Hypothesis ◽  
Physical Essence ◽  
New Construction ◽  
Soil Excavation ◽  
Theoretical Mechanics

The increasing volumes of the earthworks performed by trenching excavators during the creation of the lengthy excavations in the soil for the pipelines of different sizes and other purposes create the need to improve the excavators, to create new highly productive machines of the fundamentally new construction. The goal of this work is to increase the performance of trenching excavators equipped with the bucketless rotary implement by improving the process of the soil discharging from the implement. To achieve this goal it is required to reveal the physical essence of the soil excavation by the bucketless rotary implement and based on the performed study to determine the rational installation position for the discharging unit of the bucketless rotor. Methodology. The scientific hypothesis is that discharging of the inner circular cavities of the bucketless rotor during the trench digging and the movement of the excavated soil to the side from the trench is possible by means of rational use of the flow header pressure of the soil that is being transported in the rotor from the excavation. The study is performed with analytical methods using basic principles of the theoretical mechanics, flowing medium statics, force analysis. Results. The study confirms the scientific hypothesis of the possibility to discharge the bucketless rotary implements of the trenching excavators by using the flow header pressure of the excavated soil that is transported by the rotor from the excavation,  rational installation position of the discharging unit of the implement is defined. Originality. The scientific novelty of the study lays in the rationale and confirmation of the possi-bility to excavate and transport the soil from the excavation with the implements of the rotary trenching excavators with continuous flow and not with the separate portions. Practical value. Practical value lays in ensuring the 2-5 times performance increase of the excavation using the bucketless rotary implements.

scholarly journals WAYS TO INCREASE THE PRODUCTIVITY IN CONTINUOUSLY OPERATING TRENCHING EXCAVATORS

2021 ◽  
Vol 1 (50) ◽  
pp. 132-143
Author(s):  
Musiiko V ◽  
◽  
Koval A ◽  
Patsora D ◽  
◽  
...  
Keyword(s):  
Machine Building ◽  
Discharge Process ◽  
Two Stage ◽  
Study Objective ◽  
Highly Efficient ◽  
Scientific Hypothesis ◽  
Efficient Construction ◽  
Soil Flow ◽  
The One ◽  
Soil Excavation

The article considers and reasons the ways and possibilities to create the highly efficient constructions of trenching excavators that dig trenches of the defined profile by means of using bucketless rotors as soil excavating implements together with design of the discharge assembly improved construction. Study objective: to create a bucketless highly efficient rotary implement of the trenching excavator with two-stage discharge. Study object: continuously operation earthmoving machines. Research technique – analytical-experimental. One of the most important problems for the machine-building industry of Ukraine is the efficiency improvement of machines created in the country. Solving of this problem is required due to necessity to perform the increasing amount of earthworks in building and construction works. The cheapest way to perform lengthy soil excavations is to excavate them with trenching excavators. Increasing of their productivity is the one of the main directions to improve the efficiency of the earthworks mechanization. Increasing the efficiency of trenching excavators is possible by means bucketless rotary implement usage and by improving of the rotary discharge process. The study justifies and proves the scientific hypothesis about the possibility to use the force of the soil flow header pressure create by the soil that is being transported from the excavation for the bucketless rotary implements discharge. This allows by means of two-stage discharge of the implement to ensure the full clean-up and to improve the productivity of the soil excavation. The study analytically justifies the requirements for the main construction parameters of the bucketless rotor. Based on the obtained results the technical proposal is created for highly efficient construction of the bucketless rotary implement of the trenching excavator with two-stage discharge. KEYWORDS: BUCKETLESS ROTOR, SOIL, TWO-STAGE, DISCHARGE, DISCHARGE ASSEMBLY, TRENCH DIGGER

The Calculating Method of Deposition Thickness of Viscous Debris Flow

2012 ◽  
Vol 524-527 ◽  
pp. 808-812
Author(s):  
Yong You ◽  
Xue Ping Lin ◽  
Jin Feng Liu
Keyword(s):  
Debris Flow ◽  
Calculation Method ◽  
Flow Cell ◽  
Force Analysis ◽  
Slope Gradient ◽  
Calculating Method ◽  
Maximum Value ◽  
Viscous Debris Flow ◽  
Deposition Thickness ◽  
Theoretical Mechanics

The deposition thickness is one of the most important parameters of debris flow. How to define the deposition shape along the viscous debris flow gully and how to calculate deposition thickness rationally were rarely studied in previous researches. This paper discussed the calculation method of deposition thickness of viscous debris flow based on theoretical deduction. Firstly, force analysis was carried out for a debris flow cell selected from the deposition. Then, the formula for calculating the deposition thickness of viscous debris flow was constructed based on deduction from the viewpoint of theoretical mechanics. At last, the deposition thickness under different slope gradients, yield stresses and densities was calculated based on the deduced formula. The results showed that the deposition thickness decreases with the increasing of the slope gradient and density, and increases with the increasing of the yield stress before the deposition thickness reaches to the maximum value.

Analytical Methods for Pesticide Residue Determination in Bee Products

2002 ◽  
Vol 65 (9) ◽  
pp. 1502-1511 ◽  
Author(s):  
M. FERNÁNDEZ ◽  
Y. PICÓ ◽  
J. MAÑES
Keyword(s):  
Potential Risk ◽  
Analytical Methods ◽  
Chromatographic Separation ◽  
Consumer Health ◽  
Pesticide Analysis ◽  
Basic Principles ◽  
Detection Techniques ◽  
Field Crops ◽  
Residue Determination ◽  
Recent Developments

Monitoring pesticide residues in honey, wax, and bees helps to assess the potential risk of these products to consumer health and gives information on the pesticide treatments that have been used on the field crops surrounding the hives. The present review seeks to discuss the basic principles and recent developments in pesticide analysis in bee products and their application in monitoring programs. Consideration is given to extraction, cleanup, chromatographic separation, and detection techniques.

scholarly journals ОСОБЛИВОСТІ ДЕКОНСТРУКТИВІЗМУ В КОЛЕКЦІЯХ ЯПОНСЬКИХ ДИЗАЙНЕРІВ ОДЯГУ КІНЦЯ ХХ – ПОЧАТКУ ХХІ СТОЛІТЬ

2021 ◽  
pp. 173-184
Author(s):  
Х. І. Шевчук
Keyword(s):  
Structural Analysis ◽  
Analytical Methods ◽  
Historical Analysis ◽  
Scientific Research ◽  
Practical Significance ◽  
Basic Principles ◽  
Systematic Analysis ◽  
Distinctive Features ◽  
Main Design ◽  
Clothing Design

Purpose. The goal of this paper was to discover the main deconstruction in Japanese clothes designers creativity, methods of garment constructions, design and compositional features of fashion deconstruction. Methodology is based on system informative and visual analytical methods. Structural analysis of modification of compositional elements and method of comparative and historical analysis were used. Results. The paper describes basic principles and techniques of deconstruction in clothing design. The design and compositional features of deconstruction (shape, silhouette, construction, plastic, texture, decor, coloristic solution) in the works of Japanese clothing designers are determined. The basic principles of deconstruction in the works of Rey Kawakubo, Issey Miyake, Yohji Yamamoto are systematized and generalized, the combinations of features are inherent in each of the designers, their common and distinctive features are analyzed. Scientific novelty of the research is determined in definition and systematization of the main design and compositional features of deconstruction in clothing design. The basic principles of deconstruction in the collections of Japanese clothing designers are analyzed, the importance of the conceptual component of their work is emphasized. Practical significance. The systematic analysis of characteristics of clothes design deconstruction allows to use new interpretations and projecting unique clothes collections. The paper materials are supposed to be used in scientific research on deconstruction.

Results for serum cholesterol and triglycerides by gas-liquid chromatography, as compared with a continuous-flow technique.

1976 ◽  
Vol 22 (10) ◽  
pp. 1692-1696 ◽  
Author(s):  
R Watts ◽  
T Carter ◽  
S Taylor
Keyword(s):  
Liquid Chromatography ◽  
Serum Cholesterol ◽  
Analytical Methods ◽  
Continuous Flow ◽  
Cholesterol Ester ◽  
Chromatographic Method ◽  
Triglyceride Composition ◽  
Gas Liquid Chromatography ◽  
Reference Measurement ◽  
Obvious Advantage

Abstract We assessed the usefulness of gas-liquid chromatography forthe routine and reference measurement of cholesterol and triglycerides (triacylglycerols). Compared with results obtained by an AutoAnalyzer II method, correlation was good with both serum specimens (triglycerides, r = 0.88; cholesterol, r = 0.90) and lipoprotein fractions isolated by ultracentrifugation (triglycerides, r = 0.98; cholesterol, r = 0.98). However, none of the comparisons was completely free of analytical bias, and in general the AutoAnalyzer method underestimated the cholesterol value and overestimated triglycerides. The obvious advantage of the AutoAnalyzer is its greater analytical speed, but the chromatographic method appeared to be more accurate and precise and to suffer less from interfering substances, and in addition gave information about the cholesterol ester and triglyceride composition. We expect gas-liquid chromatography to be of major importance in the calibration of other analytical methods.

scholarly journals Operations Research Model Formulation for Road Maintenance Case

2019 ◽  
Vol 22 ◽  
pp. 32-36
Author(s):  
Jānis Pekša ◽  
Kristaps-Pēteris Rubulis
Keyword(s):  
Mathematical Model ◽  
Literature Review ◽  
Operations Research ◽  
Analytical Methods ◽  
Road Maintenance ◽  
Research Model ◽  
Model Formulation ◽  
Basic Principles ◽  
The Mathematical Model

Operations research can be used to apply analytical methods that help make precise and reasonable decisions. In road maintenance, basic principles of operations research are used to create model formulation that could help lower costs in case of an inaccurately made decision. First, the paper provides a literature review on different model formulations. Afterward, hypotheses are proposed regarding the model formulation, and then the model that minimises total generalised costs from wrong duty orders for road maintenance is offered. In conclusion, the paper evaluates the hypotheses and the process of improving the mathematical model.

scholarly journals The development of an interactive database for assessing the ecological and geomorphic state of aquatic ecosystems

2021 ◽  
Vol 258 ◽  
pp. 01009
Author(s):  
Ivan Didenko ◽  
Nadezhda Didenko ◽  
Tatiana Storchak ◽  
Sergey Sokolov
Keyword(s):  
Environmental Monitoring ◽  
Analytical Methods ◽  
Aquatic Ecosystems ◽  
Ecological State ◽  
Basic Principles ◽  
Factors Influencing ◽  
Geoinformation Technologies ◽  
River Bed ◽  
New Information ◽  
The City

The paper discusses the basic principles of using geoinformation technologies to study relief-forming processes and the ecological state of aquatic ecosystems. The object of the study is the territory of the city of Sevastopol within the valleys of the Chernaya, Kacha and Belbek rivers. To conduct environmental monitoring, it is proposed to use field and chemical-analytical methods. According to the data obtained, information and analytical maps with a geodatabase are produced. Creation of an information and analytical map with a database using GIS toolkit makes it possible to identify factors influencing the deformation of the river bed and changes in the ecological state of aquatic ecosystems. The proposed technology for monitoring the study area allows saving data, using them in projects, and supplementing these data as new information becomes available.

scholarly journals Organizational and technological reliability of the cluster formation of urban residential development

2020 ◽  
Vol 164 ◽  
pp. 04033
Author(s):  
Mikhail Semenenko ◽  
Aida Mirzakhanova
Keyword(s):  
Numerical Modelling ◽  
Free Space ◽  
Urban Areas ◽  
Residential Buildings ◽  
Cluster Formation ◽  
Residential Development ◽  
Complex Model ◽  
Basic Principles ◽  
Scientific Hypothesis ◽  
Technological Model

The purpose of this study is to determine the deterministic meaning of the term “Cluster of urban residential development” used in organizing the re-profiling of urban areas taking into account the organizational and technological model of production reliability. When implementing such projects, a set complex of combined tasks of an organizational and technological profile is solved and a number of parameters are taken into account (comfortable living, with rationally used free space; a combination of residential buildings with social, educational, cultural, everyday and entertainment facilities, etc.), as well - the basic principles of the formation of the reliability of the organizational and technological model of a cluster of urban residential development. The fundamental scientific hypothesis is that using the methods of organizational, technological, as well as numerical modelling and system engineering, the indicators of the integral reliability of construction manufacturing can be increased. As a result of the study, the cluster parameters of the urban residential for use in the complex model are established.

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