scholarly journals The influence of technological errors on the corrosion degradation of the copper alloy from the cunifer group – CuNi10Fe1,6Mn

Mechanik ◽  
2019 ◽  
Vol 92 (5-6) ◽  
pp. 391-394
Author(s):  
Jakub Kowalski ◽  
Milena Supernak-Marczewska ◽  
Krzysztof Emilianowicz ◽  
Lech Nadolny
Keyword(s):  
Sea Water ◽  
Cooling System ◽  
Welding Process ◽  
Technical Condition ◽  
Corrosion Properties ◽  
Engine Cooling ◽  
The Subject ◽  
Technological Defects ◽  
Main Engine ◽  
The Impact

Copper and nickel alloys called cunifers (Cu, Ni, Fe and R – rest of alloy elements) have found wide application in the production of ship pipeline components in contact with sea water, such as, for example, the main engine cooling system. These alloys are characterized by a very high corrosion resistance, which is ensured by appropriately carried out passivation. However, with improperly carried out passivation, this material loses its anti-corrosion properties and is often corroded. In addition, a mistakenly conducted welding process is a factor conducive to degradation processes. The purpose of this work is to show the impact of errors created during the production process and pipeline testing for its technical condition. The subject of the research was a fragment of the pipeline made of CuNi10Fe1,6Mn alloy, coming from a vessel floating on sea waters. Macro- and microscopic examinations revealed a number of technological defects that affected the degradation of this element.

Syrian - Lebanese economic relations 1958 – 2000

2021 ◽  
Vol 29 ◽  
Keyword(s):  
The Political ◽  
Economic Exchange ◽  
Economic Relations ◽  
The Subject ◽  
Political Conditions ◽  
Special Circumstances ◽  
Main Engine ◽  
The Impact ◽  
The Relationship ◽  
Descriptive Method

In the midst of dangerous circumstances and events and the thorny relations between Syria and Lebanon ,the issue of Syrian – Lebanese economic relations 1958 – 2000 came to confirm the depth of the relationship between the two counties and indicate the political tensions and the shadows it casts on economic relations. Perhaps the Syrian – Lebanese relations are among the strangest relations that exist between two countries or Even between two peoples , although it brings together a lot of special circumstances that are difficult to find in other countries , any event , even if it is fleeting , can be exploited in a way that harms the essence of the relationship in which interests may intersect between two ordinary countries that do not have any connection of historical weight or A specific geography , the Syrian – Lebanese relationship is , by virtue of history , concurrent with the emergence of the two states as political entities . This reason and others prompted me to choose this topic , which embodies the volume of trade and economic exchange between the two countries and clearly embodies the repercussions of the relationship , which passes from one period to another in a state of ebb and flow . This study sheds light on the economic relations between the two countries , although it is difficult to ignore the impact of the political conditions on them , as they are the main engine , and the decline in economic relations is only a reaction to the crisis policy in many cases . in writing this research , the researcher used the descriptive method of history , and he used an important number of sources that enriched the subject , such as the Lebanese – Syrian relations of the authors Antoine AL-Nashef and Khalil AL-Hindi , as well as the Lebanese – Syrian relations1985 -1943 issued by the Lebanese Documentation and Research Center and last but not least l hope this study will be successful in terms of providing information and facts to the lraqi offices and contributing to their enrichment and providing assistance to the lraqi researcher .

Study on Matching and Optimization of Low-Speed Diesel Engine’s Cooling System

2011 ◽  
Vol 148-149 ◽  
pp. 71-74 ◽  
Author(s):  
Guo Jin Chen ◽  
Zhong Min Liu ◽  
Ting Ting Liu ◽  
Shao Hui Su ◽  
Guang Jie Yuan ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Control Method ◽  
Cooling System ◽  
Cooling Water ◽  
The Body ◽  
Low Speed ◽  
Engine Cooling ◽  
Marine Diesel ◽  
Body Cooling ◽  
The Impact

Aiming at the high-power low-speed marine diesel engine, the paper analyzes the impact of the diesel engine’s cooling to the power, economy and NOx’s emission, studies the variable flow control method and system of the diesel engine cooling water and proposes the scheme setting up the intercooler system and the body cooling system independently in the diesel engine. The results show that the methods and systems are better to improve the engine power, reduce the fuel consumption and NOx’s emission.

scholarly journals The battery of silos for rapeseed - the impact of the building quality and exploitation conditions on the technical state of the object

2018 ◽  
Vol 174 ◽  
pp. 01036
Author(s):  
Krystyna Wróbel ◽  
Wiesław Kubiszyn
Keyword(s):  
Concrete Structure ◽  
Technical Condition ◽  
Significant Loss ◽  
Concrete Carbonation ◽  
Structural Reinforcement ◽  
The Poor ◽  
Functional Efficiency ◽  
The Subject ◽  
The Impact

The subject of the paper is a battery of silos for rapeseed located in Oil Factory in Bodaczów. It consists of 24 cylindrical silos with capacity of 500 tons and 14 star-shaped chambers between them with a capacity of 100 tons each. The silos were supported on the supporting structure in the form of permeating ring beams and columns. The height of a single silo is 25 m, and the diameter about 6.0 m. Detailed macroscopic tests were performed on the battery of silos. Destructive and sclerometric in-situ quality tests and pull-off test were performed on the concrete, the degree of concrete carbonation was estimated. The position of the reinforcement in the concrete structure and the corrosion of the reinforcement steel were determined. Static and strength calculations were carried out. Based on the results the technical condition of the object was estimated as poor, locally due to the significant loss of concrete and structural reinforcement it was estimated as imminent failure. The article presents the results of these tests, describes the reasons for the poor technical condition of the structure and presents solutions to restore its functional efficiency. A comprehensive repair of the battery of silos is currently underway applying the proposed solutions.

Study on the Impact of Welding on the Corrosion Properties of AA 6061 T6

2014 ◽  
Vol 575 ◽  
pp. 210-213
Author(s):  
Elsadig Mahdi ◽  
E. Eltai
Keyword(s):  
Pitting Corrosion ◽  
Heat Affected Zone ◽  
Open Circuit Potential ◽  
Welding Process ◽  
Corrosion Current ◽  
Open Circuit ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
The Impact ◽  
Alloy 6061

Aluminium alloy 6061 T6 circular specimens were joined using TIG welding method. AlMg5 was used as filler. The corrosion behavior of welded and un-welded AA 6061 T6 was investigated using potentiodynamic and open circuit potential (OCP) measurements. Specimens were immersed in 3.5 (wt %) NaCl solution. Different zones with different corrosion properties were created as a result of the welding process. Results reveals that sever pitting corrosion has taken place on the heat affected zone (HAZ); the corrosion current of HAZ was increased. The measured potential of HAZ was more negative and largely fluctuated comparing to base metal (BM).

scholarly journals Numerical analysis of the energy-intesive components of the vehicle body

2018 ◽  
Vol 19 (9) ◽  
pp. 141-146
Author(s):  
Dominik Gałdyński ◽  
Damian Sobków
Keyword(s):  
Numerical Analysis ◽  
Welding Process ◽  
Strength Properties ◽  
Vehicle Body ◽  
Strength Parameters ◽  
The Subject ◽  
Thin Walled ◽  
The Impact

The subject of the publication concerns the numerical analysis of the strength parameters of models of thin-walled energy-intensive structures, which include crushed the front struts of vehicle. The impact of the welding process the partial front struts. The results of the analysis of the models of unrepaired and repaired structures, taking into account changes of strength properties in the SWC and weld areas, will be compared in order to estimate the loss of primary strength properties.

Managing Service Quality, Food Quality, Price Fairness and Customer Retention: A Holistic Perspective

2020 ◽  
Vol 2 (1) ◽  
pp. 1-5
Author(s):  
Ammar Ahmed ◽  
Rafat Naseer ◽  
Muhammad Asadullah ◽  
Hadia Khan
Keyword(s):  
Service Quality ◽  
Food Quality ◽  
Service Sector ◽  
Customer Retention ◽  
Price Fairness ◽  
Policy Makers ◽  
Restaurant Management ◽  
The Subject ◽  
Research Propositions ◽  
The Impact

In this competitive environment, organizations strive to satisfy their customer by providing best quality service at affordable and fair prices with a view to enhance their revenues. To achieve the objective of revenue maximization, organizations strive to identify the factors that help them in retaining their customers. Drawing from the signalling theory of marketing, the current study proposes a novel conceptual model representing the impact of service quality with food quality and price fairness on customer retention in restaurant sector of Pakistan. The paper underlines an important arena of knowledge for academicians as well as organizational scientists on the subject. On the basis of literature available on the variables understudy, the present study forwards eight research propositions worthy of urgent scholarly attention. The conceptualized model of the present article can also be viewed significant in unleashing further avenues for the restaurant management entities, policy makers and future researchers in the domain of managing in the service sector businesses.

Solow economy model

2019 ◽  
pp. 150-157
Author(s):  
Oleksandr Synenko ◽  
Kateryna Yarema ◽  
Yuliia Bezsmertna
Keyword(s):  
Economic Growth ◽  
Regression Analysis ◽  
Solow Model ◽  
Economy Model ◽  
Accelerated Depreciation ◽  
Basic Parameters ◽  
The Subject ◽  
Investment Process ◽  
The Impact ◽  
Model Algorithm

The subject of the research is the approach to the possibility of using the Solow model to perform the regression analysis on the example of the Ukrainian economy model. The purpose of writing this article is to investigate the notion of regres- sion analysis, Solow’s economy model, algorithm for performing regression analy- sis on the example of Ukraine’s economy model. This model can be adapted for the economy of enterprises. Methodology. The research methodology is system-struc- tural and comparative analyzes (to study the structure of GDP); monograph (when studying methods of regression analysis on the example of the Ukrainian economy); economic analysis (when assessing the impact of factors on Ukraine’s GDP). The scientific novelty consists the features of the use of the Solow model on the ex- ample of Ukrainian economy are determined. An algorithm for calculating the basic parameters of a model using the Excel application package is disclosed. The main recommendations on the development of the national economy and economic growth through the use of macroeconomic instruments are given. Conclusions. The use of the Solow model enables forecasting and analysis. The results obtained re- vealed the problem of low resource return of capital as a resource, along with the means of macroeconomic regulation of the investment process, using which can improve the situation. A special place in these funds belongs to the accelerated depreciation and interest rate policies.

Assessment of small businesses activities in Ukraine

2019 ◽  
pp. 40-47
Author(s):  
Igor Ponomarenko ◽  
Kateryna Volovnenko
Keyword(s):  
Comparative Analysis ◽  
Statistical Analysis ◽  
Small Business ◽  
Small Businesses ◽  
Government Agencies ◽  
Small Enterprises ◽  
The Subject ◽  
Business Entities ◽  
The Impact ◽  
Micro Enterprises

The subject of the research is a set of approaches to the statistical analysis ofthe activities of small business entities in Ukraine, including micro-enterprises. The purpose of writing this article is to study of the features of functioningof small business entities in Ukraine. Methodology. The research methodology isto use a system-structural and comparative analysis (to study the change in thenumber of small enterprises by major components); monographic (when studyingmethods of statistical analysis of small businesses); economic analysis (when assessing the impact of small business entities on socio-economic phenomena andprocesses in Ukraine). The scientific novelty consists to determine the features ofthe functioning of small businesses in Ukraine in modern conditions. The influenceof the activities of the main socio-economic and political indicators on the activities of small enterprises in recent periods of time has been identified. It has beenestablished that there is flexibility in the development of strategies by small businesses in conditions of significant competition, which makes it possible to quicklyrespond to changing situations in specific markets. Conclusions. The use of acomprehensive statistical analysis of small businesses functioning in Ukraine willallow government agencies to develop a set of measures to optimize the activitiesof these enterprises, which ultimately will positively affect the strengthening oftheir competitiveness and will contribute to the growth of the national economicsystem.

Sign in / Sign up

Export Citation Format

Share Document