An Analysis of the Influence of the Properties of Nanodispersed Systems on the Design of Technological Equipment

2020 ◽  
pp. 3-12
Author(s):  
A.A. Popova ◽  
I.N. Shubin
Keyword(s):  
Manufacturing Industry ◽  
Design Parameters ◽  
Process Time ◽  
Technological Equipment ◽  
Mixing Process ◽  
Mixing Processes ◽  
Factors Affecting ◽  
Shape Coefficient ◽  
Technological Processes

Currently, there is a large number of dispersed and nanodispersed materials used in the manufacturing industry. They have various physicomechanical and physicochemical properties that have to be taken into account when developing and using various technological equipment as well as during technological processes. One of the main technological processes is mixing. Being sometimes auxiliary, this process is widely used in many industries, and, ultimately, determines the quality of the finished product. The influence of the rheological properties of the components to be mixed, both on the process of preparing the mixture and on the design of the equipment, has long been known. However, it is challenging to design mixing processes and mixers without taking into account such characteristics of dispersed materials as density (bulk and intrinsic), particle size and shape, coefficient of internal and external friction, hygroscopicity, adhesiveness as well as others. Usually, when considering technological processes and developing equipment, the issues of productivity, process time, energy consumption are given priority. At the same time, the influence of geometric parameters of the equipment on the mixing process and the dynamics of the movement of dispersed materials in the reaction volume has not been sufficiently studied. To address this issue, the authors examined the mixing process of dispersed materials of various sizes and bulk density using the example of a gravity mixer. The main factors affecting the quality of mixing and design parameters of the equipment for processing dispersed materials were established. Practical recommendations are given for specialists involved in the design of mixing equipment. These recommendations are general in nature, since it is problematic and indeed erroneous to give specific recommendations due to the large variety of dispersed materials and, accordingly, their physical and mechanical characteristics, as well as the equipment features.

Analysis of technological preparation of enterprises for maintenance and repair of railcars

Innotrans ◽  
2020 ◽  
pp. 44-50
Author(s):  
Vasily F. Lapshin ◽  
◽  
Elena V. Zelyukova ◽  
Oksana A. Mironova ◽  
◽  
...  
Keyword(s):  
Scientific Organization ◽  
Rolling Stock ◽  
Car Industry ◽  
Factors Affecting ◽  
Maintenance And Repair ◽  
Technological Processes ◽  
Level Of Automation ◽  
Technological Preparation ◽  
Technological Documentation

The paper analyzes the technological preparation of production at the railcar enterprises in terms of developing technological processes and processing sets of technological documents. Factors affecting the quality of technological preparation of production for maintenance and repair of rolling stock are considered. In contrast to the previously performed works, where the assessment of the level of technological training was carried out by experts of a scientific organization, the initial data in the article were the results of a survey of specialists of technical departments of structural divisions of the car industry of the Sverdlovsk and South Ural Railways. Based on the method of expert qualimetry, the weight of factors that have the greatest impact on the quality of technological processes is estimated. As a result of the survey, a low level of automation of design processes was established, which consists mainly in the design of technological documentation. It is shown that the degree of depth of development and detail of technological processes is at the level of the route description

Analysis of mixing in three-dimensional time-periodic cavity flows

1999 ◽  
Vol 386 ◽  
pp. 149-166 ◽  
Author(s):  
P. D. ANDERSON ◽  
O. S. GALAKTIONOV ◽  
G. W. M. PETERS ◽  
F. N. VAN DE VOSSE ◽  
H. E. H. MEIJER
Keyword(s):  
Periodic Structures ◽  
Three Dimensional ◽  
Periodic Points ◽  
Velocity Fields ◽  
Test Case ◽  
Cavity Flows ◽  
Mixing Process ◽  
Mixing Processes ◽  
Time Periodic

A method to locate periodic structures in general three-dimensional Stokes flows with time-periodic boundary conditions is presented and applied to mixing cavity flows. Numerically obtained velocity fields and particle tracking schemes are used to provide displacement and stretching fields. From these the location and identification of periodic points can be derived. The presence or absence of these periodic points allows a judgement on the quality of the mixing process. The technique is general and efficient, and applicable to mixing flows for which no analytical velocity field is available (the case for all three-dimensional flows considered in this paper). Results are presented for three different mixing protocols in a three-dimensional time-periodic cavity flow, serving as an accessible test case for the methods developed. A major result is that periodic lines are obtained for these three-dimensional flows. These lines can be complex in geometry and their nature can change along a line from hyperbolic to elliptic. They can serve as practical criteria in the optimization of three-dimensional mixing processes.

Анализ параметров медицинского технологического оборудования, учитывающие факторы, влияющие на качество изготовления лекарств

2020 ◽  
pp. 90-95
Author(s):  
T.V. Karlova ◽  
◽  
D.O. Sv ◽  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Particle Shape ◽  
Particle Surface ◽  
Technological Equipment ◽  
Factors Affecting ◽  
Particle Strength ◽  
The Web

The article is devoted to the analysis of parameters of medical technological equipment that take into account factors affecting the quality of manufacture of drugs. Factors such as particle size, particle size distribution, particle shape, particle surface properties, particle strength, which, based on the «Web» method, are used to analyze the «vibrosieve» technological equipment, are considered.

scholarly journals BIOMASS MIXTURES AND ITS HOMOGENEITY

2015 ◽  
Vol 1 ◽  
pp. 32
Author(s):  
Aivars Kaķītis ◽  
Imants Nulle
Keyword(s):  
Corona Discharge ◽  
Flow Direction ◽  
Electrical Charge ◽  
Small Scale ◽  
Mixing Process ◽  
Bulk Materials ◽  
Electrical Field ◽  
Mixing Processes ◽  
Flow Mixing

Components of mixtures have to be in required proportion and homogeneous mixed to provide good quality of briquettes or pellets. Analyzing the mixing processes several advantages for mixing biomass with an in-flow or continuous mixer was discovered. To provide better quality of in-flow mixing process an electrical charge can be applied to the particles using corona discharge. When a sharply pointed electrode is raised to a high potential, the intense electrical field at its tip ionizes the air in its immediate vicinity. To mix particles of different bulk materials, it is necessary to give a negative electrical charge to one material, and a positive electrical charge to other material particles. The electrical charge provides mixing on a small scale, and electrostatic forces drive the process towards a perfect mixture. In this article experiments of in-flow mixer equipped with electrodes of corona discharge is described. Three different rotation frequencies (20, 35 and 50 rpm) of conveyer shaft and five different voltages (0, 5, 10, 15, 20 kV) of corona electrodes were used to evaluate impact on flow direction of balk material.

Performance Uncertainty Quantification for Centrifugal Compressors: Part 1—Stage Performance Variation

2012 ◽  
Author(s):  
Andrea Panizza ◽  
Giuseppe Iurisci ◽  
Giuseppe Sassanelli ◽  
Sankaran Sivasubramaniyan
Keyword(s):  
Centrifugal Compressor ◽  
Companion Paper ◽  
Design Parameters ◽  
Factors Affecting ◽  
Performance Variability ◽  
Performance Variation ◽  
Sources Of Variation ◽  
Stage Performance ◽  
Computational Budget

In modern industrial practice, the quality of a new product is achieved by identifying characteristics critical to quality (CTQs) and minimizing deviation from targets, rather than merely optimizing CTQs in the absence of variation. Estimating the variation of CTQs is thus critical to understand and correctly manage risk caused by different interacting sources of uncertainty. We have developed a method to estimate performance variability for centrifugal compressor stages. In this paper, we quantify the performance variation due to impeller manufacturing variability of two stage families. The stages studied are 2D stages designed for multi-purpose applications and 2D stages for high head applications. In a related paper, the stage performance variability here determined is considered together with other sources of variation to compute the variation in flange-to-flange performance for a full compressor. The proposed approach propagates the uncertainty of the design parameters to the stage aerodynamic performance through a Monte Carlo method. In order to keep a low computational budget, calibrated 1D/2D aerodynamic models have been run in parallel to compute the performance of the stages with randomly modified geometry. The results allow the quantification of the stage performance variability and the identification of the main sources of variation. As a step towards the corresponding analysis for a complete centrifugal compressor, results from this study have been used as input for a method where all factors affecting the flange-to-flange performance are considered. The method and the results are discussed in a companion paper.

scholarly journals PENGENDALIAN KUALITAS AIR PADA PERUSAHAAN DAERAH AIR MINUM TIRTA MEULABOH UNTUK MENINGKATKAN LAYANAN KEPADA MASYARAKAT

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Fitriadi Fitriadi
Keyword(s):  
Water Quality ◽  
Quality Control ◽  
Customer Satisfaction ◽  
Quality Standards ◽  
Design Parameters ◽  
Water Quality Control ◽  
Factors Affecting ◽  
The People ◽  
Quality Of Products

Water is a basic need that is very important for humans and other living creatures. Drinking water is water whose quality meets health requirements and can drink, it was clean water is water used for daily necessities whose quality meets the requirements of health and can be taken if it has been cooked. The quality of products is one of the most important factors affecting the company's progress, as well as for the water company. In this regard discuss about water quality control if it meets quality standards or not. Quality Control of water in accordance with the standardization and quality standards are allowed very closely related to the level of customer satisfaction. Control of the quality of a product can be done by measuring the different variables that influence it. One way to measure and determine the quality of a product is by using the Taguchi method is done with the design parameters is one of the design phase of a product or process. So hopefully by doing this study water quality PDAM Tirta Meulaboh can be controlled and can be controlled which can certainly improve water services to the people of Aceh Barat.Kata Kunci : Water, Quality Control, Customer Satisfaction, Taguchi. 

Customer’s satisfaction on service quality at Vietnam Technological and Commercial Joint Stock Bank – An Giang Branch

2020 ◽  
Vol 4 (3) ◽  
pp. First
Author(s):  
Tran Minh Hieu ◽  
Nguyen Duong Ngoc Mai Chi
Keyword(s):  
Customer Satisfaction ◽  
Service Quality ◽  
Test Method ◽  
Quality Of Services ◽  
Factors Affecting ◽  
Factors Influencing ◽  
Alpha Reliability ◽  
Survey Results ◽  
Development Orientation

This study applied SERVQUAL scale of Parasuraman et al to measure factors affecting customer satisfaction on service quality at Vietnam Technological and Commercial Joint Stock Bank - An Giang Branch (Techcombank An Giang). The study was conducted to survey 207 customers who have been using the service at Techcombank An Giang. The survey results were analyzed by the Cronbach's Alpha reliability test method, then used Exploratory factor analysis (EFA) to verify and evaluate the scale of service quality. The results of the regression analysis show that customer's satisfaction about service quality at Techcombank An Giang includes four factors: The factor with the highest level is the Empathy with Beta = 0.253, the second of factor is the Responsibility with Beta = 0.248, ranked third in the influence level is the Tangible with Beta = 0.235, and the lowest impact level is the Reliability with Beta = 0.144. The research also uses statistical methods to describe and test the differences of demographic factors with customer's satisfactionon service quality.The analysis results show that there is no difference between customer's satisfaction on service quality and factors such as gender, age, income, number of transaction banks, regular transaction banks, and time to use the service at Techcombank An Giang. Through the research results, the author would like to propose some ideas to improve the quality of services, thereby attracting new customers and importantly, keeping traditional customers because the development orientation of Techcombank is to take care of old customers to cross sell other products of the bank. The Stud results offer a basis for the branch to identify the factors influencing customer satisfaction on their service quality, thereby having an appropriate strategy to improve customer satisfaction.

THE STUDY ON TA VAT WINE PRODUCTION FROM SUGAR PALM (ARENGA PINNATA) SAP

2014 ◽  
Vol 83 (5) ◽  
Author(s):  
Nguyễn Thị Hồng Thu ◽  
Đặng Minh Nhật ◽  
Nguyễn Hoàng Dung
Keyword(s):  
Room Temperature ◽  
Fermentation Process ◽  
Inoculum Size ◽  
Wine Fermentation ◽  
Wine Production ◽  
Factors Affecting ◽  
Natural Fermentation ◽  
Tropical Asia ◽  
Best Parameters

Sugar palm (Arenga pinnata) is a feather palm native to tropical Asia. In Vietnam, it is named Búng Báng or Đoác and grown only on the highlands in the central or northern part of Vietnam. It is utilized for many purposes, especially for Ta Vat wine production - a characteristic and unique product of Co Tu ethnic minority. However, because of the natural fermentation used in the production, the product quality is inconsistent. The purpose of this study was to examine a new procedure of using palm sap for making Ta Vat wine. Some characteristics of the sap, which was collected at Nam Giang district, Quang Nam province are determined, proving the potential of the sap for making wine product. The quality of sap changes quickly at room temperature. At low temperature (4 - 60C), the changes in sap quality are apparently slower. Examining some factors affecting its quality during the wine fermentation process, we determined the best parameters for the fermentation process as follows: inoculum size of 3% with cell density of about 1x108 cells/ml, the addition of the extract from the bark of Ceylon ironwood (Mesua ferrea L.) 4%. Keywords: Arenga pinnata, sap, Ceylon ironwood bark, Mesua ferrea L., wine fermentation.

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