scholarly journals Maximization and Control of Nodular Iron Melt’s Self-Feeding Characteristics to Minimize Shrinkage

2018 ◽  
Vol 925 ◽  
pp. 147-154 ◽  
Author(s):  
Vítor Anjos ◽  
Carlos A. Silva Ribeiro
Keyword(s):  
Thermal Analysis ◽  
Critical Size ◽  
Nodular Cast Iron ◽  
Process Efficiency ◽  
Closed Volume ◽  
Solidification Shrinkage ◽  
Defect Index ◽  
Solidification Morphology ◽  
Definition Of ◽  
And Control

This paper describes one possible method to anticipate and control the development of solidification shrinkage, during solidification of nodular cast iron melts, based upon industrial trials made using special designed test castings and closed volume thermal analysis cartridges.The methodology considers both the solidification morphology and solidification shrinkage critical size, which is always a difficult component of analysis, along with a developed contraction defect index, that allows the application to several types of molten metal and inoculation practices.The use of thermal analysis allows the recognition of unique melt characteristics, in real time, that are not accessed by more traditional measurement equipment. This allows the definition of thermal analysis patterns that characterize the best melt quality for self-feeding. This is a practical to use and powerful tool for modern foundries, taking advantage of new metric, data collection and data analysis. We aim to contribute to scientific knowledge and simultaneously to provide information that can be useful for foundries to improve their process efficiency.

administrasi ketatausahaan sekolah

2020 ◽  
Author(s):  
Isra Revenia
Keyword(s):  
Information Needs ◽  
Control Functions ◽  
Definition Of ◽  
The Right ◽  
And Control

This article is made to know the destinantion and the administrasi functions of the school in order to assist the leader of an organazation in making decisions and doing the right thing, recording of such statements in addition to the information needs also pertains to the function of accountabilitty and control functions. Administrative administration is the activity of recording for everything that happens in the organization to be used as information for leaders. While the definition of administration is all processing activities that start from collecting (receiving), recording, processing, duplicating, minimizing and storing all the information of correspondence needed by the organization. Administration is as an activity to determine everything that happens in the organization, to be used as material for information by the leadership, which includes all activities ranging from manufacturing, managing, structuring to all the preparation of information needed by the organization.

A STRATEGY FOR MONITORING THE IMPACTS OF COMBINED SEWER OVERFLOWS ON THE OHIO RIVER

1994 ◽  
Vol 30 (1) ◽  
pp. 167-175
Author(s):  
Alan H. Vicory ◽  
Peter A. Tennant
Keyword(s):  
National Policy ◽  
The United States ◽  
Ohio River ◽  
Combined Sewer Overflows ◽  
Treatment Technology ◽  
Design Storm ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
Definition Of ◽  
And Control

With the attainment of secondary treatment by virtually all municipal discharges in the United States, control of water pollution from combined sewer overflows (CSOs) has assumed a high priority. Accordingly, a national strategy was issued in 1989 which, in 1993, was expanded into a national policy on CSO control. The national policy establishes as an objective the attainment of receiving water quality standards, rather than a design storm/treatment technology based approach. A significant percentage of the CSOs in the U.S. are located along the Ohio River. The states along the Ohio have decided to coordinate their CSO control efforts through the Ohio River Valley Water Sanitation Commission (ORSANCO). With the Commission assigned the responsibility of developing a monitoring approach which would allow the definition of CSO impacts on the Ohio, research by the Commission found that very little information existed on the monitoring and assessment of large rivers for the determination of CSO impacts. It was therefore necessary to develop a strategy for coordinated efforts by the states, the CSO dischargers, and ORSANCO to identify and apply appropriate monitoring approaches. A workshop was held in June 1993 to receive input from a variety of experts. Taking into account this input, a strategy has been developed which sets forth certain approaches and concepts to be considered in assessing CSO impacts. In addition, the strategy calls for frequent sharing of findings in order that the data collection efforts by the several agencies can be mutually supportive and lead to technically sound answers regarding CSO impacts and control needs.

An LQ Approach to Active Control of Vibrations in Helicopters

1996 ◽  
Vol 118 (3) ◽  
pp. 482-488 ◽  
Author(s):  
Sergio Bittanti ◽  
Fabrizio Lorito ◽  
Silvia Strada
Keyword(s):  
Optimal Control ◽  
Active Control ◽  
Linear Quadratic ◽  
Control Effort ◽  
Vibration Effect ◽  
Suitable Definition ◽  
Lq Optimal Control ◽  
The One ◽  
Definition Of ◽  
And Control

In this paper, Linear Quadratic (LQ) optimal control concepts are applied for the active control of vibrations in helicopters. The study is based on an identified dynamic model of the rotor. The vibration effect is captured by suitably augmenting the state vector of the rotor model. Then, Kalman filtering concepts can be used to obtain a real-time estimate of the vibration, which is then fed back to form a suitable compensation signal. This design rationale is derived here starting from a rigorous problem position in an optimal control context. Among other things, this calls for a suitable definition of the performance index, of nonstandard type. The application of these ideas to a test helicopter, by means of computer simulations, shows good performances both in terms of disturbance rejection effectiveness and control effort limitation. The performance of the obtained controller is compared with the one achievable by the so called Higher Harmonic Control (HHC) approach, well known within the helicopter community.

scholarly journals Method for designing multi-input system identification signals using a compact time-frequency representation

2021 ◽  
Author(s):  
Mathias Stefan Roeser ◽  
Nicolas Fezans
Keyword(s):  
System Identification ◽  
Design Method ◽  
Flight Test ◽  
Compact Representation ◽  
Time Frequency ◽  
Stability And Control ◽  
Frequency Representation ◽  
Aerodynamic Parameters ◽  
Definition Of ◽  
And Control

AbstractA flight test campaign for system identification is a costly and time-consuming task. Models derived from wind tunnel experiments and CFD calculations must be validated and/or updated with flight data to match the real aircraft stability and control characteristics. Classical maneuvers for system identification are mostly one-surface-at-a-time inputs and need to be performed several times at each flight condition. Various methods for defining very rich multi-axis maneuvers, for instance based on multisine/sum of sines signals, already exist. A new design method based on the wavelet transform allowing the definition of multi-axis inputs in the time-frequency domain has been developed. The compact representation chosen allows the user to define fairly complex maneuvers with very few parameters. This method is demonstrated using simulated flight test data from a high-quality Airbus A320 dynamic model. System identification is then performed with this data, and the results show that aerodynamic parameters can still be accurately estimated from these fairly simple multi-axis maneuvers.

scholarly journals Basic approaches to the development of resistant social capital of the state customs service

2020 ◽  
pp. 100-105
Author(s):  
Tetiana Ruda
Keyword(s):  
Social Capital ◽  
Research Abstract ◽  
The State ◽  
Practical Implementation ◽  
Monitoring Design ◽  
Theoretical Generalization ◽  
Basic Approaches ◽  
Time Variables ◽  
Definition Of ◽  
And Control

Purpose. The aim of the article is research of the peculiarities of the development of resistant social capital of the State Customs Service and development of proposals for the development of a model of its development. Methodology of research. The following methods are used to achieve this goal: induction and deduction, theoretical generalization, abstraction, dialectical cognition – in the study of scientific sources and research of theoretical aspects of the development of resistant social capital, the definition of the categorical apparatus of the research; abstract and logical – to generalize theoretical positions, to form conclusions and proposals on the research topic. Findings. The essence and features of the development of resistant social capital are determined. The expediency of developing a model of development of resistant social capital of the State Customs Service, which is based on the principles of attributiveness and synergy, is substantiated. It allows to take into account the influence of environmental factors of the department and time variables on the development of social capital. The structural content of the development model is given, which includes: attributes of the object of development, attributes of the internal and external environment. The object, goals, functions and principles of building a model of development of resistant social capital of the State Customs Service are determined. A detailed description of each stage of application of the model of development of resistant social capital of the State Customs Service is given, which includes: monitoring, design, planning, implementation and control. The advantages of practical implementation of the proposed model are outlined. Originality. The study of theoretical aspects of the development of resistant social capital of the State Customs Service has been further developed. For the first time, proposals for the formation of a model for the development of resistant social capital at the sectoral level have been developed, its structure, features of practical implementation and advantages of application have been determined. Practical value. The main provisions of this study can be used in the process of developing proposals for the development of conceptual areas of development of resistant social capital in the State Customs Service. Key words: development, attributiveness, attributive model of development, development of resistant social capital of the State Customs Service, model of development of resistant social capital of the State Customs Service.

scholarly journals Quality control in the production process of sunflower oil

2021 ◽  
Vol 845 (1) ◽  
pp. 012111
Author(s):  
N L Kleymenova ◽  
L I Nazina ◽  
I N Bolgova ◽  
A N Pegina ◽  
O A Orlovseva
Keyword(s):  
Production Process ◽  
Statistical Methods ◽  
Vegetable Oil ◽  
Process Efficiency ◽  
Process Stability ◽  
Pareto Chart ◽  
Oil Processing ◽  
Output Quality ◽  
The One ◽  
Definition Of

Abstract The typical problem of vegetable oil processing is to ensure the consistency of the output quality. The one parameter that mostly affects quality is the presence of wax, which commands control at all stages of the process (refinement, odours removal, freezing). Statistical methods of analysis can be usefully applied to the improvement of vegetable oil processing, as demonstrated by this study. The authors in fact used statistical methods in order to: a) optimize parameters consistency, b) enhance process efficiency, c) improve economic performance and finally, d) assess process stability. The following statistical tools were used in the study: 1) Histograms, 2) Shewhart Charts, 3) Ishikawa Diagrams and, 4) Pareto Chart. A first major finding was that the occurrence of process flaws that would result in product rejection had a 5% probability of happening at all stages of the process. Moreover, the analysis of process stability with maps of average values and ranges leads to the finding that the process itself is statistically unstable. Finally, cause-and-effect relationships of influencing factors (such as the quality of feedstock) were investigated, thus determining the main causes of flaw in the production process. This leads to the definition of corrective actions, the effectiveness of which was then investigated and evaluated.

scholarly journals Methods of the Fiscal Mechanism for Regulating the Investment Development of the Ukrainian Economy

2020 ◽  
pp. 71-76
Author(s):  
Viktoriya Rudenko ◽  
Keyword(s):  
Economic Development ◽  
National Economy ◽  
Financial Policy ◽  
Investment Activity ◽  
Economic Issues ◽  
Theoretical Approaches ◽  
Scientific Substantiation ◽  
Definition Of ◽  
And Control ◽  
Financial Mechanism

In market conditions, one of the main regulators of economic development is the financial mechanism, a key element of which is the fiscal mechanism for regulating the national economy investment development. Currently, the methods of the fiscal mechanism are not used effectively enough in Ukrainian practice, as evidenced by the low investment attractiveness of the economy and weak investment activity of economic entities. Therefore, the definition of the essence and components of methods of the fiscal mechanism is currently among the important financial and economic issues, the scientific substantiation of which largely depends on the economy investment development. The article is devoted to the study of theoretical approaches to the functioning of the methods of the financial mechanism and on this basis to determine the content and composition of the methods of the fiscal mechanism. It was determined that there are various approaches to understanding the essence of financial methods (as means, forms, methods, rules) and three conceptual approaches to the interpretation of the methods of financial mechanism: management (considers the methods of financial mechanism as processes in which implementation of financial policy); organizational (treats the methods of the financial mechanism as a means of organizing financial relations, which are formed in the process of implementing financial policy); complex (characterizes the methods of the financial mechanism as a process of organizing financial relations to achieve the objectives of financial policy). As a result of research of theoretical bases of functioning of financial methods the essence of methods of the fiscal mechanism of regulation of national economy investment development was substantiated. The main methods of the fiscal mechanism were identified, including planning, organization and control. The basic requirements to functioning of methods of the fiscal mechanism of regulation of the national economy investment development were considered.

scholarly journals Microgrid System Design Based on Model Based Systems Engineering: the Case Study in the Amazon Region

2021 ◽  
Author(s):  
Miguel Angel Orellana Postigo ◽  
José Reinaldo Silva
Keyword(s):  
Systems Engineering ◽  
Amazon Forest ◽  
Small Communities ◽  
Model Based ◽  
Network Operation ◽  
Engineering Effort ◽  
Definition Of ◽  
And Control ◽  
Model Based Systems Engineering

Microgrid is a technically and economically viable opportunity to meet the demands of populations that, for various reasons, do not have access to electricity. The complexity of Smart Grid (SG) systems requires considerable engineering effort in the design process. Designing this type of complex system requires new approaches, methods, concepts and engineering tools. Where, requirements analysis plays a major role in better characterizing, understanding and specifying the domain of application that SG systems should solve. This work presents a systemic proposal based specifically on System Systems (SoS) which anticipates the formalization of requirements, aiming to understand, analyze and design SG within the scope of Model Based Systems Engineering (MBSE). The definition of a microgrid from the SoS perspective is presented in order to provide a complete view of its life cycle. Requirements would be represented in an Objective Oriented  Requirements Engineering (GORE) approach, specifically using visual diagrams based on the Keep All  Objectives Satisfied (KAOS) method, where network operation and control will be formally represented. A case  study for small communities in the equatorial Amazon forest is used as a case study for the proposed method.

scholarly journals Evolution of inoculation thermal analysis and solidification morphology of compacted graphite iron

2021 ◽  
Vol 59 (01) ◽  
pp. 51-57
Author(s):  
S. Ai ◽  
Z. Xu ◽  
Z. Liu ◽  
H. Song ◽  
A. Wang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Compacted Graphite Iron ◽  
Compacted Graphite ◽  
Solidification Morphology

scholarly journals ACCOUNTING IN TAXATION OF ENTERPRISES

2021 ◽  
pp. 115-128
Author(s):  
Olena PODOLIANCHUK
Keyword(s):  
Accounting Information ◽  
Tax Base ◽  
Planning And Control ◽  
Indirect Taxes ◽  
The Subject ◽  
Characteristic Features ◽  
Business Entities ◽  
Definition Of ◽  
Tax Reporting ◽  
And Control

The article analyzes the revenues of the consolidated budget of Ukraine and determines that budget revenues are growing, mainly due to taxes and fees. The normative definition of the terms «tax» and «collection» is revealed and the main characteristic features are outlined. A critical assessment of the essence of the characterized definitions was made and the inconsistency of the terminological apparatus was determined. It was found that the definitions take into account the principle of mandatory payment of tax or fee paid by a particular payer to a specific account of the allocation budget. The main criteria for distinguishing between direct and indirect taxes are highlighted: method of translation: direct – one participant in the calculation and payment, indirect – several participants; object of taxation: direct – from income, profit, property and resources, indirect – from the value of consumption or use of goods; subject of payment: direct is paid by the taxpayer – the manufacturer or seller, the owner of the goods, indirect – by the subject of the tax burden (the buyer who incurs costs). Taking into account the research of scientists and their own opinion, it is proposed to substantiate at the legislative level the terminology of definitions of direct and indirect taxes, as well as to outline a clear classification list. It is proved that accounting influences management decisions, as the received accounting information certifies the data on the activity of the enterprise and gives the chance to carry out further planning and control. It is determined that the purpose of accounting in taxation is to form a reliable and legally justified size of the tax base and determine the amounts of tax liabilities from taxes and fees for generalization in tax reporting for individual taxes. The accounting process of calculations for taxes and fees of business entities is outlined. It is proposed to separate the objects of taxation in the accounting policy of enterprises.

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