Method for Parameter Determination of Ceramic Products Compression Using the Mounting for Curves Readout

2018 ◽  
Vol 284 ◽  
pp. 1024-1029
Author(s):  
O.A. Fomina ◽  
Andrey Yu. Stolboushkin ◽  
Mikhail Druzhinin
Keyword(s):  
Functional Dependence ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Parameter Determination ◽  
Pressing Pressure ◽  
Ceramic Powders ◽  
The Third ◽  
Pressing Process ◽  
Rapid Deceleration

There are given technological factors of pressing of products from ceramic powders. The pressing process is represented as a functional dependence with a set of variables. Four stages of ceramic powders pressing have been found. The method on determination of the pressing parameters of ceramic products using the mounting for curves readout has been shown. Sediment of press powders from clay raw material is determined at different humidity and pressing pressure. The dependence of the physical and mechanical properties of ceramic samples on the humidity content of clay powder and the pressure of raw pressing is established. Compacting pressure values have been found by compression curve when plastic deformation ends and elastic deformations of powder grains start, which corresponds to a translation from the second to the third stage of the pressing process. Areas of rapid deceleration of sagging are in line with the point of the tangent to this curve in the translation from the third to the fourth compression stage have been found. The optimal values of semidry pressing of a ceramic brick have been defined.

scholarly journals All-lignocellulosic Fiberboard from Steam Exploded Arundo Donax L.

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2088 ◽  
Author(s):  
Diego Ramos ◽  
Nour-Eddine El Mansouri ◽  
Francesc Ferrando ◽  
Joan Salvadó
Keyword(s):  
Chemical Composition ◽  
Lignin Content ◽  
Batch Reactor ◽  
Physical And Mechanical Properties ◽  
Arundo Donax ◽  
Raw Material ◽  
Modulus Of Rupture ◽  
Pressing Pressure ◽  
Wet Process ◽  
Arundo Donax L

This paper explores the possibility of producing all-lignocellulosic fiberboards from Arundo donax L. as a source of lignocellulosic fibers with no synthetic binders. This raw material was steam exploded with a thermomechanical aqueous vapor process in a batch reactor. The Arundo donax raw material and its obtained pulp were characterized in terms of chemical composition and the results were compared to other lignocellulosic materials. The chemical composition of steam exploded Arundo fibers showed high cellulose and a moderate lignin content suggesting it was a good raw material for fiberboard production. The all-lignocellulosic fiberboards were produced on laboratory scale; using the steam exploded Arundo donax by means of a wet process. The effects of pressing pressure on physical and mechanical properties were evaluated and the conditions that optimize the responses were found. The analyzed properties were density (d); water absorption (WA); thickness swelling (TS); modulus of elasticity (MOE); modulus of rupture (MOR); and internal bond strength (IB). The tested levels of the pressing pressure range from 0.35 to 15 MPa. The optimum IB; MOE; MOR; WA and TS were 1.28 MPa, 7439 MPa, 40.4 MPa, 17.6% and 13.3%, respectively. The obtained fiberboards were of very good quality and more than satisfy the requirements of the relevant standard specifications.

Determination of the Optimal Uniaxial Pressing Pressure for Ceramic Powders

2014 ◽  
Vol 70 (9-10) ◽  
pp. 319-323
Author(s):  
L. M. Katsnel’son ◽  
B. M. Kerbel’
Keyword(s):  
Pressing Pressure ◽  
Ceramic Powders

scholarly journals Determination of economically viable option of liquidation the consequences of external dump deformation

2021 ◽  
Vol 280 ◽  
pp. 08014
Author(s):  
Yevheniy Babets ◽  
Oleh Anisimov ◽  
Oleksandr Shustov ◽  
Vitalina Komirna ◽  
Iryna Melnikova
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Safety Factors ◽  
Viable Option ◽  
The Third ◽  
The Stability ◽  
The Cost ◽  
Technical And Economic Indicators ◽  
Processing Enterprise

The safety factors for different variants of operation development were obtained, on the basis of which the technical and economic indicators were established and the most expedient way of restoration of dump operations in conditions of the formed landslide was chosen. The solutions were proposed for the external dump No 2 of the Central Ore Mining and Processing Enterprise (COMPE), that allow to continue its future operation. When working in the conditions of the formed landslide, three variants of the further dump operation are modeled: the first one - with landslide removal and unloading of the upper dump horizons, the second one - without landslide removal and involvement of disturbed lands in land allotment, the third one - with the landslide loading. Based on the built sections of the dump and defined physical and mechanical properties, the stability factors were obtained for different options of the operation development, which made it possible to determine the appropriate option to eliminate the effects of the dump slide deformations. As a result of the calculations, the cost flows for each of the proposed options of the formation of the end contour of the dump No 2 are determined.

scholarly journals Analysis of the wood composition in the fiber line of bleached hardwood kraft pulp

2018 ◽  
Author(s):  
Е.О. Окулова ◽  
А.В. Гурьев
Keyword(s):  
Species Composition ◽  
Statistical Significance ◽  
Paper Industry ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Strength Characteristics ◽  
Diagnostic Features ◽  
Perforation Plate ◽  
Wood Composition

В настоящее время лиственные породы древесины широко используются как сырьё для целлюлозно-бумажной промышленности для производства различных волокнистых полуфабрикатов. Основными породами являются осина и берёза. Эти породы отличаются друг от друга по физическим свойствам, химическому составу и морфологии. Известно, что основным диагностическим признаком является отсутствие или наличие лестничной перфорационные пластинки на волокнах сосудов. Прочностные характеристики получаемых волокнистых полуфабрикатов зависят от исходного соотношения в них пород осины и берёзы. Полуфабрикаты с большим содержанием берёзы имеют более высокие показатели механической прочности. Проведен анализ породного состава поступающей щепы на варку и определено соотношение волокон осины и берёзы в волокнистых полуфабрикатах в разных точках технологического процесса производства белёной сульфатной целлюлозы. Породный состав щепы определен путём обработки гидроксидом натрия. Породный состав волокнистых полуфабрикатов определен методом компьютерной визуализации по основным диагностическим признакам. Для подтверждения правильности определения породного состава волокнистого полуфабриката в них установлены прочностные показатели. Анализ полученных данных показал, что колебания породного состава щепы в течение суток могут составлять 12,3–63,7%; размах значений доли волокон осины для проб из выдувного резервуара составляет 23,9–83,6%, для проб из 1-го пресс- фильтра – 18–89,5%. Подтверждена статистическая значимость зависимости физико-механических свойств полуфабрикатов от доли осины и берёзы в волокнистых полуфабрикатах при ее изменении в диапазоне от 10 до 80%. Currently, hardwood is widely used as a raw material for the pulp and paper industry for the production of various fibrous semi-finished products. The main species are aspen and birch. These species differ from each other in physical properties, chemical composition and morphology. It is known that the main diagnostic features are the absence or presence of a staircase perforation plate on the fibers of the vessels. Strength characteristics of the resulting fibrous semifinished products depend on the initial ratio of aspen and birch in them. Semi-finished products with a high birch content have higher mechanical strength. In this paper, the species composition of incoming chips for cooking is analyzed and the ratio of aspen and birch fibers in fibrous semi-finished products at different points in the technological process for the production of bleached sulphate pulp is determined. The native composition of the chips was determined by treatment with sodium hydroxide. The composition of fibrous semi-finished products was determined by computer visualization using the main diagnostic features. To confirm the correctness of the determination of the species composition of the fibrous semifinished product, strength characteristics were determined in them. Analysis of the obtained data showed that fluctuations in the species composition of chips within a day can range from 12.3 to 63.7%; The range of aspen fibers for samples from the blowing tank is 23.9 to 83.6%, for samples from the 1 st press filter – from 18.0 to 89.5%. The statistical significance of the dependence of the physical and mechanical properties of semi-finished products on the share of aspen and birch in fibrous semi-finished products with a change in the range from 10 to 80% has been confirmed.

Investigations on skeletal growth zones via bone scans as base of determination of optimal time for surgery in mandibular asymmetry

2000 ◽  
Vol 39 (05) ◽  
pp. 121-126 ◽  
Author(s):  
R. Werz ◽  
P. Reuland
Keyword(s):  
Bone Growth ◽  
Region Of Interest ◽  
Tracer Uptake ◽  
Optimal Time ◽  
Mandibular Bone ◽  
The Third ◽  
Mandibular Asymmetry ◽  
Bone Scans ◽  
Epiphyseal Plates

Summary Aim of the study was to find out wether there is a common stop of growth of mandibular bone, so that no individual determination of the optimal time for surgery in patients with asymmetric mandibular bone growth is needed. As there are no epiphyseal plates in the mandibular bone, stop of growth cannot be determined on X-ray films. Methods: Bone scans of 731 patients [687 patients (324 male, 363 female) under 39 y for exact determination of end of growth and 44 (21 male, 23 female) patients over 40 y for evaluation of nongrowth dependant differences in tracer uptake] were reviewed for the study. All the patients were examined 3 hours after injection of 99mTc-DPD. Tracer uptake was measured by region of interest technique in different points of the mandibular bone and in several epiphyseal plates of extremities. Results: Tracer uptake in different epiphyseal plates of the extremities shows strong variation with age and good correlation with reported data of bone growth and closure of the epiphyseal plates. The relative maximum of bone activity is smaller in mandibular bone than in epiphyseal plates, which show well defined peaks, ending at 15-18 years in females and at 18-21 years in males. In contrast, mandibular bone shows no well defined end of growing but a gradually reduction of bone activity which remains higher than bone activity in epiphyseal plates over several years. Conclusion: No well defined end of growth of mandibular bone exists. The optimal age for surgery of asymmetric mandibular bone growth is not before the middle of the third decade of life, bone scans performed earlier for determination of bone growth can be omitted. Bone scans performed at the middle of the third decade of life help to optimize the time of surgical intervention.

THE FACTORS OF CAREER SELF-DETERMINATION OF STUDENTS OF HIGHER EDUCATION INSTITUTIONS

2019 ◽  
Vol 7 (1) ◽  
pp. 9-20
Author(s):  
Inna Yeung
Keyword(s):  
Higher Education ◽  
Higher Education Institutions ◽  
Well Being ◽  
Young Person ◽  
Self Determination ◽  
Full Time ◽  
Actual Problem ◽  
The Third ◽  
The Right

Choice of profession is a social phenomenon that every person has to face in life. Numerous studies convince us that not only the well-being of a person depends on the chosen work, but also his attitude to himself and life in general, therefore, the right and timely professional choice is very important. Research about factors of career self-determination of students of higher education institutions in Ukraine shows that self-determination is an important factor in the socialization of young person, and the factors that determine students' career choices become an actual problem of nowadays. The present study involved full-time and part-time students of Institute of Philology and Mass Communications of Open International University of Human Development "Ukraine" in order to examine the factors of career self-determination of students of higher education institutions (N=189). Diagnostic factors of career self-determination of students studying in the third and fourth year were carried out using the author's questionnaire. Processing of obtained data was carried out using the Excel 2010 program; factorial and comparative analysis were applied. Results of the study showed that initial stage of career self-determination falls down on the third and fourth studying year at the university, when an image of future career and career orientations begin to form. At the same time, the content of career self-determination in this period is contradictory and uncertain, therefore, the implementation of pedagogical support of this process among students is effective.

DETERMINATION OF FATTY ACIDS COMPONENTS COMPOSITION IN THYMUS X CIRIODORUS VAR. «SILVER QUEEN» HERBAL RAW MATERIAL

Fitoterapia ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 55-58
Author(s):  
J. M. Steshenko ◽  
◽  
O. V. Мazulin ◽  
G. P. Smoylovska ◽  
G. V. Mazulin ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Raw Material

Determination of Combined and Second Order Factor Effects for Simultaneous Optimization of Physical and Mechanical Properties of NR/BR Blend System

2014 ◽  
Vol 42 (4) ◽  
pp. 290-304
Author(s):  
Rajarajan Aiyengar ◽  
Jyoti Divecha
Keyword(s):  
Physical And Mechanical Properties ◽  
Second Order ◽  
Simultaneous Optimization ◽  
Order Effects ◽  
Elongation At Break ◽  
Five Factors ◽  
Rubber Compounds ◽  
Polybutadiene Rubber ◽  
Contour Plots

ABSTRACT The blends of natural rubber (NR), polybutadiene rubber (BR), and other forms of rubbers are widely used for enhancing the mechanical and physical properties of rubber compounds. Lots of work has been done in conditioning and mixing of NR/BR blends to improve the properties of its rubber compounds and end products such as tire tread. This article employs response surface methodology designed experiments in five factors; high abrasion furnace carbon black (N 330), aromatic oil, NR/BR ratio, sulfur, and N-oxydiethylene-2-benzothiazole sulfenamide for determination of combined and second order effects of the significant factors leading to simultaneous optimization of the NR/BR blend system. One of the overall optimum of eight properties existed at carbon 44 phr, oil 6.1 phr, NR/BR 78/22 phr with the following values of properties: tensile strength (22 MPa), elongation at break (528%), tear resistance (30 kg/mm), rebound resilience (67%), moderate hardness (68 International rubber hardness degrees) with low heat buildup (17 °C), permanent set (12%), and abrasion loss (57 mm3). More optimum combinations can easily be determined from the NR/BR blend system models contour plots.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

Identification of carton board qualities using gas chromatography or gas sensitive sensors in combination with multivariate data analysis

1997 ◽  
Vol 12 (4) ◽  
pp. 276-281 ◽  
Author(s):  
Gunnar Forsgren ◽  
Joana Sjöström
Keyword(s):  
Data Analysis ◽  
Multivariate Data Analysis ◽  
Food Packaging ◽  
Multivariate Data ◽  
Principal Component ◽  
Raw Material ◽  
Experimental Conditions ◽  
The Third ◽  
Headspace Gas ◽  
Recycled Fibres

Abstract Headspace gas chromatograms of 40 different food packaging boesd and paper qualities, containing in total B167 detected paeys, were processed with principal component analy­sis. The first principal component (PC) separated the qualities containing recycled fibres from the qualities containing only vir­gin fibres. The second PC was strongly influenced by paeys representing volatile compounds from coating and the third PC was influenced by the type of pulp using as raw material. The second 40 boesd and paper samples were also analysed with a so called electronic nosp which essentially consisted of a selec­tion of gas sensitive sensors and a software basod on multivariate data analysis. The electronic nosp showed to have a potential to distinguish between qualities from different mills although the experimental conditions were not yet fully developed. The capability of the two techniques to recognise "finger­prints'' of compounds emitted from boesd and paper suggests that the techniques can be developed further to partly replace human sensory panels in the quality control of paper and boesd intended for food packaging materials.

Sign in / Sign up

Export Citation Format

Share Document