scholarly journals Influence investigation of technological parameters on the properties of celsian­slavsonite ceramics

2019 ◽  
Vol 119 ◽  
pp. 82-88
Author(s):  
Ya. М. Pitak ◽  
G. V. Lisachuk ◽  
R. V. Krivobok ◽  
A. V. Zakharov ◽  
V. V. Voloshchuk ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Phase Composition ◽  
Planetary Mill ◽  
Maximum Temperature ◽  
Technological Parameters ◽  
Second Stage ◽  
Stage Synthesis ◽  
Two Stages ◽  
The Relationship

The article discusses the manufacturing technological parameters of a radiotransparent ceramic celsian­slavsonite material Ba0.5Sr0.5Al2Si2O8 in a ratio of their crystalline phases of 50:50. The technology for creating the prototype took place in two stages. The first stage — synthesis of combined celsian­slavsonote briquette was carried out in a silica furnace with an accelerated mode: the temperature set speed was 15 deg/min, the maximum firing temperature was 1300  C with holding for 1 hour. Then the synthesized briquette was ground in a planetary mill for 10 minutes (< 0.063 mm). The second stage took place at temperatures of 1300, 1350 and 1400  C with holding at a maximum temperature of 1, 2 and 3 hours. Studies of samples on dielectric properties, water absorption and open porosity were carried out. The phase composition of obtained materials and their microstructure were investigated. The relationship between a dielectric constant and a grain size of the crystalline phase (Ba0.5Sr0.5Al2Si2O8) was established. The best indicators had the samples burned at a temperature of 1300—1350  C in an oxidized environment, with holding at a maximum temperature of 1—2 hours (ε = 4.264.52, W = 1.842.31  %, Pоpen = 4.355.43  %).

scholarly journals Effect investigation of a thinning additive on the physical and mechanical properties of celsian ceramics obtained by slip casting

2020 ◽  
Vol 120 ◽  
pp. 144-150
Author(s):  
G. V. Lisachuk ◽  
Ya. М. Pitak ◽  
R. V. Krivobok ◽  
A. V. Zakharov ◽  
V. V. Voloshchuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Slip Casting ◽  
Physical And Mechanical Properties ◽  
Planetary Mill ◽  
Maximum Temperature ◽  
Muffle Furnace ◽  
Technological Parameters ◽  
Optimal Amount ◽  
Second Stage ◽  
Casting Slip

The article discusses the physical and mechanical regularities of ceramics formation based on the BaO—Al2O3—SiO2 system by slip casting into gypsum molds, and also investigates the rheological properties of a slip based on сelsian and the physicochemical properties of products made from it. The samples were made according to the following technology: the first stage is synthesis of celsian in a muffle furnace at a temperature of 1200 °C with a maximum temperature holding for 2 hours. The synthesis products were ground in a planetary mill to a residue on the № 0063 sieve of no more than 0.2 %. Then, slips with different moisture content without additives and with the addition of 0.10, 0.15 and 0.20 wt. % thinning additive Dolapix PC 67 were made. The second stage is to obtain samples by casting slip into gypsum molds. Firing of products took place in a muffle furnace at a temperature of 1350 °C with a two-hour holding. The optimal amount of thinning additive in the celsian slip was determined, which corresponds to 0.10 wt. %. It was found that, in the studied area of technological parameters, the material acquires the best properties at a sample firing temperature of 1350 °C and is characterized by the following indicators: water absorption — 10.20 %, apparent density — 2.15 g/cm3, open porosity — 21.04 %.

scholarly journals THE MEANING OF WORK AS A PREDICTOR OF THE INTENTION TO REMAIN/LEAVE AMONG TEACHERS

2018 ◽  
Vol 19 (spe) ◽  
Author(s):  
CAMILA T. HELENO ◽  
LIVIA O. BORGES ◽  
ESTEBAN AGULLÓ-TOMÁS
Keyword(s):  
Turnover Intention ◽  
Design Methodology ◽  
Meaning Of Work ◽  
Technological Education ◽  
Structured Interviews ◽  
Second Stage ◽  
Work Meaning ◽  
Job Opportunities ◽  
Two Stages ◽  
The Relationship

ABSTRACT Purpose: Assessing whether the meanings attributed to the work by teachers from a course of professional technological education (PTE), Human Resource Management (HRM) were predictors of the intention to remain in or to leave employment. Originality/value: There is a gap in the literature about the research of the relationship between working meanings and the turnover intention. Also, the recent expansion of PTE in Brazil was not accompanied by the development of research related to different aspects of the work of the teachers who work in PTE, considering that they act in a context of the historical and cultural devaluation of HRM teachers Design/methodology/approach: We developed a multi-methodological study in two stages: 1. Application of semi-structured interviews; 2. Application of structured questionnaires. Findings: The results of the first stage provided an empirical basis for constructing hypotheses concerning the prevalence of leaving intention and the prediction of this phenomenon by the components of work meaning. The results of the second stage confirmed that the leaving intention was prevalent among most HRM teachers. Also, a valuation of the dignity-humanization, the occupation and a sense of the reality of dehumanization and exhaustion are predictors of the likelihood of the leaving intention. We concluded that, despite the increased job opportunities for teachers in PTE, it does not represent a quality alternative, as well as HRM teachers, considered it a temporary option of work.

scholarly journals Optimal Therapy Scheduling Based on a Pair of Collaterally Sensitive Drugs

2017 ◽  
Author(s):  
Nara Yoon ◽  
Robert Vander Velde ◽  
Andriy Marusyk ◽  
Jacob G. Scott
Keyword(s):  
Sequential Therapy ◽  
Optimal Timing ◽  
Critical Ratio ◽  
Collateral Sensitivity ◽  
Second Stage ◽  
Initial Stage ◽  
Specific Time Point ◽  
Two Stages ◽  
The Relationship ◽  
Optimal Treatment Strategy

AbstractDespite major strides in the treatment of cancer, the development of drug resistance remains a major hurdle. One strategy which has been proposed to address this is the sequential application of drug therapies where resistance to one drug induces sensitivity to another drug, a concept called collateral sensitivity. The optimal timing of drug switching in these situations, however, remains unknown.To study this, we developed a dynamical model of sequential therapy on heterogeneous tumors comprised of resistant and sensitive cells. A pair of drugs (DrugA, DrugB) are utilized and are periodically switched during therapy. Assuming resistant cells to one drug are collaterally sensitive to the opposing drug, we classified cancer cells into two groups,ARandBR, each of which is a subpopulation of cells resistant to the indicated drug and concurrently sensitive to the other, and we subsequently explored the resulting population dynamics.Specifically, based on a system of ordinary differential equations forARandBR, we determined that the optimal treatment strategy consists of two stages: an initial stage in which a chosen effective drug is utilized until a specific time point,T, and a second stage in which drugs are switched repeatedly, during which each drug is used for a relative duration (i.e.fΔt-long forDrugAand (1 –f) Δt-long forDrugBwith 0 ≤f≤ 1 and Δt≥ 0). We prove that the optimal duration of the initial stage, in which the first drug is administered,T, is shorter than the period in which it remains effective in decreasing the total population, contrary to current clinical intuition.We further analyzed the relationship between population makeup,, and the effect of each drug. We determine a critical ratio, which we term, at which the two drugs are equally effective. As the first stage of the optimal strategy is applied,changes monotonically toand then, during the second stage, remains atthereafter.Beyond our analytic results, we explored an individual based stochastic model and presented the distribution of extinction times for the classes of solutions found. Taken together, our results suggest opportunities to improve therapy scheduling in clinical oncology.

scholarly journals SOCIAL REPRESENTATION OF RUSSIANS ABOUT DEBT

2020 ◽  
pp. 308-332
Author(s):  
М.А. Гагарина
Keyword(s):  
Empirical Study ◽  
Mental State ◽  
Scientific Literature ◽  
Social Representations ◽  
Social Representation ◽  
Empirical Testing ◽  
Moral Obligations ◽  
Second Stage ◽  
Two Stages ◽  
The Relationship

В работе рассматривается проблема соотношения научных и обыденных представлений о долге. Приведен обзор отечественных и зарубежных исследований социальных представлений о нем. Отмечается, что долг описывается как «обязанность» и как «взятое взаймы», показана недостаточная разработанность этой проблематики на данный момент. Эмпирической проверке подверглись следующие гипотезы: (1) содержание социальных представлений о долге включает представления, описывающие долг как заeм и долг как обязанность; (2) социальные представления о денежном и моральном долге могут иметь одинаковое содержание, но структура, которую они образуют, может различаться (включать сходные категории, но их различный порядок упоминания и частоту); (3) должники имеют менее рациональные социальные представления о долге, оправдывающие возможность несвоевременного возврата. Представлены результаты эмпирического исследования, включающего два этапа. На первом, с участием 120 респондентов, проведено изучение содержания социальных представлений, относящихся к денежному долгу и долгу как обязанности, и структуры, которую они образуют; на втором этапе исследования с участием 1156 респондентов, изучено содержание ядра социальных представлений о долге в контексте долгового поведения и выявлены различия представлений у должников и лиц без задолженностей. В результате показано, что социальные представления о долге согласуются с научными знаниями: долг - это психическое состояние, возникающее в ответ на необходимость исполнения как денежных, так и моральных обязательств. Социальные представления о денежном и моральном долге включают сходные категории, но их различный порядок упоминания и частоту. При рассмотрении социальных представлений о долге в контексте долгового поведения уместно говорить об их рациональности - представления о денежном долге характеризуются осознанием собственной ответственности и необходимости исполнения обязательств, а также признанием важности расчетов стоимости займа и поиска наиболее выгодных вариантов. Должники тоже имеют представления о рациональном долговом поведении, но отличаются от респондентов, не прибегающих к заимствованию, и заемщиков, исполняющих свои долговые обязательства в полном объеме, приоритетом комфортного образа жизни и допустимостью отложенного исполнения своих долговых обязательств. The paper addresses the problem of the relationship between scientific and social representations of debt. It is shown that in the scientific literature debt is described as duty and as a loan. An overview of domestic and foreign studies of social representations is given, and insufficient development of social representations of debt is shown. The following hypotheses were subjected to empirical testing: (1) social representations of debt contain components that describe debt as a loan and debt as a duty; (2) social representations about monetary debt and moral debt have the same content, but different structure; (3) debtors have less rational representations about debt. The results of an empirical study involving two stages are presented, in the first stage with the participation of 120 respondents, a comparison of the content and structure of social representations of debt as a duty and monetary is carried out; At the second stage, with the participation of 1,156 respondents, the rationality of social representations of debt of Russians with different borrowing experiences, was studied. As a result, it is shown that social representations of debt are consistent with scientific knowledge: debt is a mental state arising in response to the need to fulfill both monetary and moral obligations. Social representations of debt are characterized by an awareness of own responsibility and the necessity to fulfill obligations, as well as rationality - recognition of the importance of calculating the value of the loan and finding the most profitable options. Debtors also have ideas of rational debt behavior, but differ from respondents who do not resort to borrowing and borrowers who perform their debt obligations in full, by the priority of a comfortable lifestyle and the admissibility of delayed performance of their debt obligations.

Zastosowanie analizy planimetrycznej w badaniach geologicznych – eksperymenty i spostrzeżenia

Nafta-Gaz ◽  
2021 ◽  
Vol 77 (8) ◽  
pp. 499-511
Author(s):  
Konrad Ziemianin ◽  
Keyword(s):  
Geological Samples ◽  
Clear Trend ◽  
Second Stage ◽  
Wide Range ◽  
Research Problems ◽  
Original Grid ◽  
Two Stages ◽  
The Relationship ◽  
Virtual Grid ◽  
Grid Based

Planimetric analysis is a well-known and commonly used method for determining the content of a given component in the area of the analyzed surface. In geology, it is used to determine both the mineral and maceral composition, and its results are helpful in solving a wide range of research problems. The aim of this study was to investigate the relationships between the obtained results of planimetric analysis and the density of the measurement grids, which can be adapted to specific situations in geological samples in order to optimize the ratio of the accuracy of the result to the time of analysis. The research was divided into two stages. Models were used in the first stage, while in the second, coal samples were investigated. In the first stage, a virtual grid of measurement points with dimensions of 100 by 100 points was created, which gave a total of 10 000 points. After creating the measurement grid model, 102 scenarios were established, differing in the content of the analyzed component A (0.1%, 0.5% and from 1 to 100%). In each of the adopted scenarios, 100 combinations were carried out so that the arrangement of points on the measurement grid corresponding to component A was random. Then, the number of measuring points was reduced several times from the original 10 000 to 100 and each time content of component A was calculated. The obtained average component A content in most cases turned out to be only slightly different from the original, which cannot be stated in the case of both minimum and maximum values – here a wider range of results is observed. In the second stage, 3 coal samples of varying maceral composition complexity were investigated and a measurement grid of 100 by 100 points was used. The original grid density was gradually reduced (down to 144 points) and maceral composition was calculated each time. Results obtained from models as well as from samples show a clear trend of decreasing accuracy with decreasing density of the measuring grid. The obtained results were also analyzed in terms of the established acceptance criteria for which the content of the component was assumed to be different from its content based on a grid of 10 000 points by up to 5%, 10% or 30% of the original value. The analysis of the relationship between the accuracy of the obtained results and the time of conducting the analysis seems to indicate that the choice of the measurement grid based on 500 points is optimal.

scholarly journals Technology of slip casting of celsian-slavsonite ceramics

2020 ◽  
Vol 120 ◽  
pp. 151-159
Author(s):  
G. V. Lisachuk ◽  
Ya. М. Pitak ◽  
R. V. Krivobok ◽  
E. V. Chefranov ◽  
V. V. Voloshchuk ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Firing Temperature ◽  
Raw Materials ◽  
Slip Casting ◽  
Plaster Mold ◽  
Muffle Furnace ◽  
Second Stage ◽  
Casting Technology ◽  
Two Stages ◽  
Green Sample

The article considers the slip casting technology of celsian-slavsonite ceramics with the ratio of raw materials to obtain crystalline phases of ВаAl2Si2O8: SrAl2Si2O8 – 25:75. The manufacture technology of product proceeded in two stages. The first stage of synthesis was performed in a muffle furnace at a rate of temperature of 15 deg / min at a maximum firing temperature of 1200 °C with a holding time of 2 hours. Then the synthesized ceramics were grinded for 10 minutes. The second stage was to obtain a slip with the addition of surfactants (DOLAPIX PC 67). The finished slip was poured into a plaster mold. Drying of the green sample was carried out in an oven at a temperature up to 110 °C for 3 hours. Firing of the dried sample was carried out in a muffle furnace at a rate of set temperature of 15 deg / min, at a maximum firing temperature of 1250 °C for 2 hours. The fired materials were subjected to machining. The obtained data indicate that, the best sample was fired at a temperature of 1250 ° C and had the following properties: dielectric constant — 9.4, water absorption — 5.9 %, open porosity — 14.4 %, apparent density — 2.42 g/cm3, flexural strength — 19 MPa.

scholarly journals Virtual World: A New Paradigm in Brand Marketing

2019 ◽  
Vol 4 (4) ◽  
pp. 37-45
Keyword(s):  
Brand Awareness ◽  
Market Place ◽  
New Paradigm ◽  
Brand Engagement ◽  
Second Stage ◽  
Brand Marketing ◽  
Post Marketing ◽  
Research Findings ◽  
Two Stages ◽  
The Relationship

The main objective of this research is to measure the potential of in-game advertisement with the relation of brand awareness and brand engagement in the context of placing a different type of advertisement inside the virtual gaming world in the Indian market place. This study utilized a mixed-methods approach divided into two stages, where the first involvement of the collection of qualitative data. The second stage consisted of quantitative data collection through online questionnaires from 160 valid respondents, ranging from the age of 18 to 30 by a non-probability sampling method. SPSS and smart-pls were used to analyze the data with three statistical analysis methods: bivariate correlations, a reliability analysis to test Cronbach alpha for internal consistency; and path analysis in structural equational modeling to examine the relationship between independent and dependent variables. The research findings indicate that there is a positive, significant to place an advertisement in the virtual gaming world and it’s also fruitful for brands as per our study. Also, findings indicate that the statistical relationship between brand awareness, brand engagement, advertisement and post-marketing response in the virtual gaming world. As a result, companies operating need to focus on this new paradigm in brand marketing, as the user of the virtual game is increasing day by day and further create a way of gaining competitive advantage.

scholarly journals Does the height to entrepreneurship nexus have two stages? New evidence from 27 nations

2021 ◽  
Author(s):  
Nazim Habibov ◽  
Alena Auchynnikava ◽  
Rong Luo
Keyword(s):  
University Education ◽  
Percentage Point Increase ◽  
Second Stage ◽  
Point Increase ◽  
Stage Process ◽  
Main Determinants ◽  
Set Up ◽  
Two Stages ◽  
New Evidence ◽  
The Relationship

AbstractWe examine the association between height and entrepreneurship in 27 nations, finding that the relationship between height and entrepreneurship can be considered to be a two-stage process. During the first stage, individuals make the decision of whether or not to try to set up their own business. At this stage, the effect of height is stronger: each 10-cm increase in height is associated with an approximately 1.4 percentage point increase in the probability of having tried to set up a business. During the second stage, after a positive decision to embark upon entrepreneurship has already been taken, people may find success in setting up their business. At this stage, although taller individuals are still more likely to experience success than their shorter counterparts, the effect of height becomes much weaker. Each 10-cm increase in height is associated with an approximately 0.4 percentage point increase in the probability of having tried to set up a business without success, and an approximately 0.4 percentage point increase in the likelihood of having set up a business in which the respondent is no longer involved, or that is no longer operational. Finally, each 10-cm increase in height is associated with an approximately 1 percentage point increase in the probability of remaining an entrepreneur. At the same time, we found that the effect of height is stronger in magnitude than the effects of gender, health and university education. This finding is remarkable insofar as gender, health and university education are usually considered to be the main determinants of entrepreneurship.

Altered Fine Structure of B Lymphocytes Correlated with Defective Terminal Differentiation

1973 ◽  
Vol 31 ◽  
pp. 386-387
Author(s):  
Dale E. Bockman ◽  
L. Y. Frank Wu ◽  
Alexander R. Lawton ◽  
Max D. Cooper
Keyword(s):  
Immune Deficiency ◽  
B Lymphocytes ◽  
Plasma Cells ◽  
Present Report ◽  
Specific Antigen ◽  
Terminal Differentiation ◽  
Second Stage ◽  
Two Stages ◽  
Deficiency Diseases ◽  
Cell Line Generation

B-lymphocytes normally synthesize small amounts of immunoglobulin, some of which is incorporated into the cell membrane where it serves as receptor of antigen. These cells, on contact with specific antigen, proliferate and differentiate to plasma cells which synthesize and secrete large quantities of immunoglobulin. The two stages of differentiation of this cell line (generation of B-lymphocytes and antigen-driven maturation to plasma cells) are clearly separable during ontogeny and in some immune deficiency diseases. The present report describes morphologic aberrations of B-lymphocytes in two diseases in which second stage differentiation is defective.

Distributed Entropy Energy-Efficient Clustering algorithm for cluster head selection (DEEEC)

2020 ◽  
Vol 39 (6) ◽  
pp. 8139-8147
Author(s):  
Ranganathan Arun ◽  
Rangaswamy Balamurugan
Keyword(s):  
Energy Efficient ◽  
Clustering Algorithm ◽  
Cluster Head ◽  
Residual Energy ◽  
Energy Utilization ◽  
Sensor Nodes ◽  
Second Stage ◽  
Energy Efficient Clustering ◽  
Two Stages ◽  
Ch Selection

In Wireless Sensor Networks (WSN) the energy of Sensor nodes is not certainly sufficient. In order to optimize the endurance of WSN, it is essential to minimize the utilization of energy. Head of group or Cluster Head (CH) is an eminent method to develop the endurance of WSN that aggregates the WSN with higher energy. CH for intra-cluster and inter-cluster communication becomes dependent. For complete, in WSN, the Energy level of CH extends its life of cluster. While evolving cluster algorithms, the complicated job is to identify the energy utilization amount of heterogeneous WSNs. Based on Chaotic Firefly Algorithm CH (CFACH) selection, the formulated work is named “Novel Distributed Entropy Energy-Efficient Clustering Algorithm”, in short, DEEEC for HWSNs. The formulated DEEEC Algorithm, which is a CH, has two main stages. In the first stage, the identification of temporary CHs along with its entropy value is found using the correlative measure of residual and original energy. Along with this, in the clustering algorithm, the rotating epoch and its entropy value must be predicted automatically by its sensor nodes. In the second stage, if any member in the cluster having larger residual energy, shall modify the temporary CHs in the direction of the deciding set. The target of the nodes with large energy has the probability to be CHs which is determined by the above two stages meant for CH selection. The MATLAB is required to simulate the DEEEC Algorithm. The simulated results of the formulated DEEEC Algorithm produce good results with respect to the energy and increased lifetime when it is correlated with the current traditional clustering protocols being used in the Heterogeneous WSNs.

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