scholarly journals Corrosion reasons in oil-well tubing of oil fields and their life technological support

2016 ◽  
Vol 1 (6) ◽  
pp. 11-16 ◽  
Author(s):  
Антон Тюсенков ◽  
Anton Tyusenkov ◽  
С. Черепашкин ◽  
S. Cherepashkin
Keyword(s):  
Corrosion Inhibitors ◽  
Oil Fields ◽  
Oil Well ◽  
Main Method ◽  
Technological Support ◽  
Basic Reason ◽  
Inner Surface ◽  
Selection Of

Basic reason corrosion destructions, factors intensifying corrosion in oil-well tubing (OWT) of oil fields are analyzed. The main method of protection of OWT inner surface is the use of corrosion inhibitors. The selection of corrosion inhibitors is carried out.

IMPROVEMENT OF SPRING DURUM WHEAT SELECTION METHODOLOGIES UNDER CLIMATE CHANGE CONDITIONS

1970 ◽  
pp. 33-36
Author(s):  
А. I. Grabovets ◽  
V. P. Kadushkina ◽  
S. А. Kovalenko
Keyword(s):  
Grain Yield ◽  
Durum Wheat ◽  
Correlation Coefficient ◽  
Harvest Index ◽  
Unit Area ◽  
Correlation Coefficients ◽  
Chemical Mutagenesis ◽  
Main Method ◽  
The Relationship ◽  
Selection Of

With the growing aridity of the climate on the Don, it became necessary to improve the methodology for conducting the  breeding of spring durum wheat. The main method of obtaining the source material remains intraspecific step hybridization. Crossings were performed between genetically distant forms, differing in origin and required traits and properties. The use of chemical mutagenesis was a productive way to change the heredity of genotypes in terms of drought tolerance. When breeding for productivity, both in dry years of research and in favorable years, the most objective markers were identified — the size of the aerial mass, the mass of grain per plant, spike, and harvest index. The magnitude of the correlation coefficients between the yield per unit area and the elements of its structure is established. It was most closely associated with them in dry years, while in wet years it decreased. Power the correlation of the characteristics of the pair - the grain yield per square meter - the aboveground biomass averaged r = 0.73, and in dry years it was higher (0.91) than in favorable ones (0.61 - 0.70) , between the harvest and the harvest index - r = 0.81 (on average). In dry years, the correlation coefficient increased to 0.92. Research data confirms the greatest importance of the mass of grain from one ear and the plant in the formation of grain yield per unit area in both dry and wet years. In dry years, the correlation coefficient between yield and grain mass per plant was on average r = 0.80; in favorable years, r = 0.69. The relationship between yield and grain mass from the ear was greater — r = 0.84 and r = 0.82, respectively. Consequently, the breeding significance of the aboveground mass and the productivity of the ear, as a criterion for the selection of the crop, especially increases in the dry years. They were basic in the selection.

FEATURES OF ORGANOPHOSPHATES IMMOBILIZATION VIA STREPTAVIDIN-BIOTIN SYSTEM FOR EXPERIMENTS ON SELECTION OF APTAMERS

2020 ◽  
pp. 12-20
Author(s):  
D. A. Belinskaya ◽  
Yu. V. Chelusnova ◽  
V. V. Abzianidze ◽  
N. V. Goncharov
Keyword(s):  
Polyethylene Glycol ◽  
Organophosphorus Compounds ◽  
Binding Energies ◽  
Rna Aptamers ◽  
Main Method ◽  
Modeling Methods ◽  
Molecular Dynamics Methods ◽  
Systematic Evolution ◽  
Exponential Enrichment ◽  
Selection Of

Poisoning with organophosphorus compounds occupy one of the leading places in exotoxicosis. At the first stage, the detoxification of organophosphates can be provided with the help of DNA or RNA aptamers that bind the poison in the bloodstream. Currently, the main method of searching for aptamers is the experimental method of systematic evolution of ligands by exponential enrichment (SELEX). In the process of aptamer selection, the target molecule must be immobilized via the streptavidin-biotin complex. Since the poison molecule is small in size, to increase its availability for binding to aptamer, it is necessary to use a spacer between organophosphorus compounds and biotin. The aim of this work was to optimize the selection of aptamers for organophosphorus compounds by increasing the availability of a poison molecule immobilized via the streptavidin-biotin complex on the example of paraoxon. For this purpose, three spacers between organophosphorus compounds and biotin were tested using molecular modeling methods: three links of polyethylene glycol (3-PEG), four links of polyethylene glycol (4-PEG) and aminohexyl. The conformation of the biotinylated paraoxon complex with streptavidin and the interaction of paraoxon with the binding fragment of the aptamer were modeled using molecular docking and molecular dynamics methods. The ability of biotinylated paraoxon to bind to the aptamer has been evaluated by analyzing the surface area of the paraoxon available to the solvent, as well as by calculating the free binding energies. It has been shown that only in the case of aminohexyl immobilized paraoxon can contact the aptamer. At the final stage, the synthesis of paraoxon bound to biotin via aminohexyl was carried out.

METHODS OF JAMMING INTERFERENCE

2018 ◽  
pp. 80-84
Author(s):  
A. V. Mazin ◽  
M. Yu. Aliyev
Keyword(s):  
Noise Immunity ◽  
Time Constraints ◽  
Joint Operation ◽  
Directional Diagram ◽  
Main Method ◽  
High Noise ◽  
Time Processing ◽  
Radar Systems ◽  
Interference Signals ◽  
Selection Of

The article investigates the problem of providing high noise immunity radar under the influence of passive and intentional interference. The purpose of radio operation of the radar is to create conditions that would impede the operation of systems and minimize its effectiveness. The main method of radio transmission is still creating (staging) interference. Modern radar systems must solve the tasks in terms of electronic suppression using, including intentional interference and under severe time constraints. It is shown that the most effective way to improve the noise immunity of radar systems designed to operate in multipoint space, including non-stationary, interference is adaptive space-time processing of the received signals, based on the angular selection of targets, due to the formation of zeros in the directional diagram in the direction of interference sources. This problem is solved by determining the accuracy of the direction finding of interference sources and is achieved by the joint operation of the antenna array and multi-channel signal processing devices, namely the separation of interference signals on different receiving channels.

scholarly journals Understanding Uncertainty and Risk in Management

2020 ◽  
Vol 12 (1) ◽  
pp. 12-35
Author(s):  
Piotr Jedynak ◽  
Sylwia Bąk
Keyword(s):  
Value Added ◽  
Research Process ◽  
Main Method ◽  
Proper Understanding ◽  
Organization Management ◽  
One Dimensional ◽  
Modern Management ◽  
Research Findings ◽  
Selection Of

AbstractObjective: The purpose of this text is to identify approaches to defining and subsequently reviewing the definitions of uncertainty and risk as interdisciplinary terms which are of key importance in modern management.Methodology: The work is theoretical. The main method used in the research process was the analysis of scientific literature. A one-dimensional logical classification method was also used, in order to categorize approaches to defining uncertainty and risk, satisfying the exhaustive and mutually exclusive criteria in the selection of categories of approaches.Findings: The main results of the work are: 1) identification of approaches to defining uncertainty and risk, 2) interdisciplinary review of definitions of uncertainty and risk indicating the criteria to distinguish between the two, and 3) determination of the meaning of the terms uncertainty and risk in modern management.Value Added: Considering the approaches to defining uncertainty and risk taken from many fields and disciplines of science, this text is a compendium of theoretical knowledge for the proper understanding and meaning of these concepts in management.Recommendations: The research findings can have implications for both management theory as well as the practice of organization management.

scholarly journals Visual rehabilitation of patients with irregular cornea

The Eye ◽  
2019 ◽  
Vol 125 (2019-1) ◽  
pp. 26-32 ◽  
Author(s):  
Alexander Myagkov ◽  
Elena Belousova ◽  
Natalya Ignatova ◽  
Oksana Petrova
Keyword(s):  
Visual Acuity ◽  
Contact Lenses ◽  
Visual Comfort ◽  
Irregular Surface ◽  
Visual Rehabilitation ◽  
Main Method ◽  
Landing Zone ◽  
Optical Correction ◽  
Selection Of ◽  
Spectacle Correction

Purpose: To estimate the possibility of optical correction of an irregular surface of a cornea at primary ectasia (keratoconus) and secondary ectasia (a consequence of radial keratotomy (RKT) and Keratoplasty) for improvement of the maximum of visual acuity. Material and methods: In the study the scleral gas-permeable lenses (SGCL) were fitting by the 60 patients, it was 45 men and 15 women from them. The 46 patients had various stage of keratoconus and 14 patients had the keratectasia after RKT. On the 5 eyes of the patients was carried out keratoplasty earlier. Criteria of successful selection of SGCL considered achievement of steadily high visual acuity, comfort of carrying and the optimal clearance in apical zone, in the limbal and landing zone on the conjunctiva also. The results: In the course of the study, the maximum visual acuity in all patients was achieved with mini-SGKL correction irrespective of type of keratoektasia. All patients observed visual comfort compared with spectacle correction or correction with other types of contact lenses. Conclusion: Scleral gas-permeable contact lenses are the main method of correction at patients with irregular corneas and provide the best visual acuity.

Effect of Inhibitors on Scale Removal in HCl Pickling Solutions

CORROSION ◽  
1968 ◽  
Vol 24 (2) ◽  
pp. 45-49 ◽  
Author(s):  
O. L. RIGGS ◽  
R. M. HURD
Keyword(s):  
Hydrochloric Acid ◽  
Corrosion Inhibitors ◽  
Functional Relationship ◽  
Acid Corrosion ◽  
Optimum Concentration ◽  
Metal Dissolution ◽  
Inhibitor Concentration ◽  
Temperature Dependent ◽  
Scale Removal ◽  
Selection Of

Abstract Inhibitors are available which effectively reduce the loss of metal because of corrosion occurring in the hydrochloric acid pickling baths. Selection of these inhibitors, however, must take into consideration the effect the inhibitor will have on scale dissolution. The optimum concentration of inhibitor must consider the functional relationship between inhibitor concentration and the rate of scale removal. This relationship is not the same as that between inhibitor concentration and metal dissolution rate. Data are shown on scale dissolution rates for two corrosion inhibitors in 10 percent by weight hydrochloric acid at temperatures of 55 through 85 C (131–185 F). Extrapolations to somewhat higher temperatures of some pickling operations can be made. However, it was observed that all corrosion inhibitor effects on scale removal became somewhat temperature-dependent at, or near, 80 C. The experimental acid corrosion inhibitors (B and C) exhibit surfactant behavior between 55–75 C, removing scale more quickly than did the uninhibited acid.

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