scholarly journals Laboratory and Statistical Analysis of Chosen Concentrating Table Technological Parameters Influence on Coal Sludge Enrichment Process

2016 ◽  
Vol 32 (3) ◽  
pp. 173-194
Author(s):  
Michał Mazurek ◽  
Anna Manowska ◽  
Rafał Jendruś
Keyword(s):  
Statistical Analysis ◽  
Correlation Analysis ◽  
Quality Parameters ◽  
Coal Industry ◽  
Ash Content ◽  
Technological Parameters ◽  
Fine Grained ◽  
Coal Sludge ◽  
Enrichment Process ◽  
The Given

AbstractConcentrating tables are a group of one of the oldest and most precise gravitational concentrators with a broad spectrum of application. They were used mainly for the anthracite enrichment process in the domestic coal industry. Conducted research prove that they can be also used for the enrichment of fine grained coals types. The article discusses the results of coal sludge enrichment using WILFLEY concentration tables, as the results obtained show that coal sludge enrichment using these concentration tables allows for the production of coal concentrates and half-products of satisfying quality parameters, the ash content of which varies between several and a dozen or so percent. The reciprocal connection between the actual contents and enrichment process has been determined based on a dependency analysis between the changing characteristics. The correlation analysis allowed for an evaluation of the dependencies between the technological parameters of the enrichment process and the obtained qualitative-quantitative parameters results, which allows the given mineral enrichment process to perform correctly. The enrichment process of the studied sludge has been performed using the most unfavorable construction parameters i.e. using sulcate plate, its inclination angle remained at 6°, furthermore studied material has not been hyphenated.

The Influence of Laser Beam Technological Parameters on the Polymethyl Methacrylate Surface Quality

2018 ◽  
Vol 919 ◽  
pp. 190-198 ◽  
Author(s):  
Vladimír Pata ◽  
Libuše Sýkorová ◽  
Oldřich Šuba ◽  
Milena Kubišová
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Laser Beam ◽  
Surface Quality ◽  
Polymethyl Methacrylate ◽  
Quality Parameters ◽  
Technological Parameters ◽  
Detailed Statistical Analysis ◽  
Mathematical Relations

The paper is focused on the determination of the course and change of the surface quality parameters obtained by the laser engraving of the material known under commercial name polymethyl methacrylate. The paper aims to find mathematical relations based on regression analysis for amplitudes parameters Ra and Rz. For this purpose, a sample of variable technology parameters will be machined followed by the surface measuring and evaluation using the Talysurf CLI 500 3D Surface Scanner. Thus the data obtained will be subjected to the detailed statistical analysis to check homoscedasticity, the presence of outliers, and multidimensional normality testing.

scholarly journals Investigation of properties, structural links and structure of dispersed systems from coal sludges

2021 ◽  
Vol 64 ◽  
pp. 154-165
Author(s):  
A Pavlуchenko ◽  
O Haidai ◽  
V Firsova ◽  
T Lampika
Keyword(s):  
Mechanical Properties ◽  
Mineral Composition ◽  
Adhesion Force ◽  
Coal Industry ◽  
Optical Methods ◽  
Technological Parameters ◽  
Dispersed Systems ◽  
Industry Waste ◽  
Coal Sludge ◽  
Deformation Properties

Goal. Investigate the mineral composition of coal sludge and determine its effect on the properties, structural bonds and structure of dispersed systems from them. The research technique consists in the application of methods for measuring the structural and mechanical properties of dispersed systems. To assess the characteristics of the mechanical properties of structured dispersed systems, the most rational methods are to determine their deformation properties: strength - ultimate shear stress, modulus of elasticity and relaxation characteristics. Macroscopic and optical methods were used to study the mineral composition of sludges from coal concentrators. Results of the research. The study of coal industry waste as dispersed systems is performed. The factors and structured structure that influence the technological processes in the processing of coal sludge and the application of the method of electrokinetic lumping are analyzed. The mineral composition of waste - dispersed systems is determined. It is established that the main factors determining the structural and rheological properties of dispersed systems include: adhesion force in the contacts between particles, coordination number, concentration of the dispersed phase in the dispersion medium, dispersion and particle size distribution. It is proved that the main factor that determines the interaction of dispersed systems is the presence of adsorption balls of surfactants. Scientific novelty. An inseparable connection between dispersed systems and surface phenomena, as well as the kinetics of electrochemical processes on interfacial surfaces, microheterogeneity, sorption and ion exchange processes in ultramicroporous systems has been established. Practical meaning. Technological parameters of processes and ways of perspective treatment of wastes of coal concentrators as dispersed systems at their processing and use as additional power resources are substantiated.

The Effects of Exercise Commitment Facilitated by Service Quality of Smartphone Exercise Applications on Continued Exercise Intention

2019 ◽  
Vol 118 (1) ◽  
pp. 14-19
Author(s):  
Boo-Gil Seok ◽  
Hyun-Suk Park
Keyword(s):  
College Students ◽  
Factor Analysis ◽  
Regression Analysis ◽  
Statistical Analysis ◽  
Correlation Analysis ◽  
Service Quality ◽  
Frequency Analysis ◽  
Primary Data ◽  
Exercise Intention

Background/Objectives: The purpose of this study is to examine the effects of exercise commitment facilitated by service quality of smartphone exercise Apps on continued exercise intention and provide primary data for developing and/or improving smartphone exercise Apps. Methods/Statistical analysis: A questionnaire survey was conducted amongst college students who have experiences in using exercise App(s) and regularly exercise. The questionnaire is composed of four parts asking about service quality, exercise commitment, continued exercise intention, which were measured with a 5-point Likert Scale, and demographics. Frequency analysis, factor analysis, correlation analysis, and regression analysis were carried out to analyze the obtained data with PASW 18.0.

Structural Relationships among Customer Delight, Exercise Commitment, and Psychological Happiness

2019 ◽  
Vol 118 (1) ◽  
pp. 8-13
Author(s):  
Boo-Gil Seok ◽  
Hyun-Suk Park
Keyword(s):  
College Students ◽  
Factor Analysis ◽  
Statistical Analysis ◽  
Confirmatory Factor Analysis ◽  
Correlation Analysis ◽  
Frequency Analysis ◽  
Structural Correlation ◽  
Structural Relationships ◽  
Confirmatory Factor ◽  
Customer Delight

Background/Objectives: The purpose of this study is to find out the structural relationships among customer delight, exercise commitment, and psychological happiness to contribute developing exercise Apps. Methods/Statistical analysis: A questionnaire survey was conducted and 160 college students who are familiar with mobile exercise applications participated. The data analyzed with frequency analysis, exploratory factor analysis, confirmatory factor analysis, correlation analysis, and structural correlation analysis. The validity and the reliability were obtained: customer delight (χ2=26.532, df=14, CFI=.985, TLI=.971, RMSEA=.075), exercise commitment (χ2=113.802, df=49, CFI=.956, TLI=.941, RMSEA=.091), and psychological happiness (χ2=15.338, df=8, CFI=.989, TLI=.980, RMSEA=.076, and Cronbach’s α=.906~.938).

Ekstrak Biji Mahoni (Swietenia Mahogany (L.)Jacq) Untuk Pembuatan Obat Anti Nyamuk Elektrik

2018 ◽  
Vol 3 (1) ◽  
pp. 7
Author(s):  
Yuska Novi Yanti ◽  
Hepiyansori Hepiyansori
Keyword(s):  
Bitter Taste ◽  
Quality Parameters ◽  
Ash Content ◽  
Tropical Region ◽  
Mosquito Repellent ◽  
Standard Quality ◽  
Traditional Crops

<p>Indonesia daerah tropis yang baik untuk perkembangan jenis nyamuk sehingga membahayakan kesehatan. Indonesia kaya tanaman tradisional untuk  pengobatan. Salah Satunya Mahoni (Swietenia mahogany (L.)Jacq) pada bagian biji yang digunakan masyarakat untuk pengobatan malaria, diabetes, dan darah tinggi. Kandungan pada biji Mahoni yaitu saponin dan flavanoid dapat digunakan sebagai sediaan obat anti nyamuk. Sampel penelitian ini adalah biji mahoni yang diambil dari Taman Remaja Kota Bengkulu lalu di maserasi menggunakan pelarut metanol p.a dan etanol 96% selanjutnya ekstrak dibuat menjadi 3 konsentrasi ekstrak yaitu 1%, 3% dan 5%. Kemudian dibuat keping anti nyamuk dan di buat obat anti nyamuknya, dilanjutkan dengan pengujian evalusi ekstrak meliputi uji organoleptis, uji kadar abu dan uji rendemen kemudian pengujian evalusi sediaan yang meliputi uji organoleptis, uji keping anti nyamuk dan uji ketahanan sediaan. Hasil penelitian didapatkan, ekstrak metanol biji mahoni dapat mempengaruhi sifat fisik sediaan keping nyamuk, Ekstrak biji mahoni berwarna coklat sampai kemerahan, memiliki bau khas (aroma kacang tanah), konsistensi cukup padat sedikit berminyak dan berasa pahit. Uji parameter standar menghasilkan data untuk rendemen sebesar 0,8235% untuk metanol dan 0,6747% untuk etanol, kadar abu untuk metanol 1,249% dan untuk etanol 1,022%. sehingga ekstrak metanol biji mahoni dapat dibuat menjadi sediaan keping anti nyamuk.</p><p><em>Indonesia tropical region places the development  some mosquitoes that endanger health. Indonesia traditional crops can used for treatment. Mahoni (Swietenia mahogany (L.)Jacq)  a plant which usually treatment. Especially   part of the seed malaria drugs, diabetes and high blood pseasure.That in the seeds of mahoni there is saponin and flavonid can be used as a mosquito repellent. The sample this research is seeds mahoni taken from the Remaja Bengkulu Pares. Processed  maserasi with methanol solvent p.a and ethanol 96% next methanol made to 3 concentration an extract that 1%, 3% and 5%. Created pieces of mosquito repellent and mosquito repellent that followed terts the evaluation of extract. covers organoleptis, ash content and rendemen and testing performed and evaluation dosage, includes organoleptis, pieces  mosquito repellent and dosage resutance.Result experiment is extract methanol seeds mahoni 82,35 gram and extract ethanol seeds mahoni 67,47 gram. Extract colored from dark brown to reddish, have peanut like aroma, adequate compact consistency, bitter taste and not sticky in hand. The result of standard quality parameters rendemen extract methanol 0,8235% and rendemen extract ethanol 0,6747%, ash content extract methanol 1,247% and ash content extract ethanol 1,022%. so that the extract of methanol mahogany seeds can  made into anti-mosquito </em></p>

Statistical analysis and physicochemical characteristics of groundwater ‎quality parameters: a case study

2021 ◽  
pp. 1-22
Author(s):  
Yaqoob Iqbal Memon ◽  
Sundus Saeed Qureshi ◽  
Imdad Ali Kandhar ◽  
Naeem Ahmed Qureshi ◽  
Sumbul Saeed ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Groundwater Quality ◽  
Physicochemical Characteristics ◽  
Quality Parameters

scholarly journals Quality Assessment of Raw Honey Issued from Eastern Romania

Agriculture ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 247
Author(s):  
Aida Albu ◽  
Cristina-Gabriela Radu-Rusu ◽  
Ioan Mircea Pop ◽  
Gabriela Frunza ◽  
Gherasim Nacu
Keyword(s):  
Electrical Conductivity ◽  
Refractive Index ◽  
Storage Conditions ◽  
Quality Parameters ◽  
Climatic Conditions ◽  
Ash Content ◽  
Botanical Origin ◽  
Free Acidity ◽  
Qualitative Level ◽  
Raw Honey

Romania is known among the main European honey producers, due to the variety of landforms as well as the diversity of the flora. Thirty-four honey samples of the acacia, linden and multifloral types, produced in eastern Romania and collected during 2013–2018, were physico-chemically analyzed using methods provided by the national and EU standards. The results of water-insoluble solids, color and refractive index were found to be 0.023–0.131%, 0.3–76.4 mm Pfund and 1.485–1.499, respectively. The moisture content ranged between 15.20% and 20.77%, solid substances content ranged between 79.23% and 84.80% and total soluble substances content ranged between 77.83 °Brix and 83.26 °Brix. The obtained values of specific gravity were from 1.414 to 1.450 g/cm3, pH ranged from 3.673 to 5.503 and free acidity ranged between 2.4 meq and 50 meq kg−1. The ash content and the electrical conductivity varied between 0.030 and 0.543% and 130 and 679 µS cm−1, respectively. Pearsonʹs correlation analysis showed an intense association of the ash content with electrical conductivity (r = 0.81). Our findings reveal the qualitative level of Romanian honey and the variation in quality parameters due to factors such as geographical region, climatic conditions, botanical origin and handling or storage conditions.

scholarly journals LEAN MANUFACTURING PROCESS PLANNING FOR 5 AXES CNC DRIVEN MILLING MACHINE

2019 ◽  
Vol 4 (1) ◽  
pp. 10-28
Author(s):  
Sándor Bodzás ◽  
Béla Krakkó
Keyword(s):  
Lean Manufacturing ◽  
Optimal Choice ◽  
Depth Of Cut ◽  
Milling Machine ◽  
Technological Parameters ◽  
Future State ◽  
Manufacturing Process Planning ◽  
Manufacturing Technologies ◽  
The Right ◽  
The Given

The aim of this publication is to determine the OEE (Overall Equipment Efficiency) indicator for 5 axes milling machine found at Diehl Aircabin Hungary Ltd. for the present and future state. Based on this value, the utilization of the machine for the given production amount can be calculated. With the optimal choice of the right production parameters (the number of cuts, feeding, depth of cut, etc.) greater productivity can be achieved i.e. the machine main time (time of cutting) will be less. The possibilities of the reduction of the machine time will be analysed and calculated. Setting of the appropriate technological parameters the machine main time could be decreased. The calculation of the machine main time will be determined for the most frequent manufacturing technologies.

scholarly journals Analysis of the development of export prices of selected agricultural and food commodities in the Czech Republic

2005 ◽  
Vol 53 (3) ◽  
pp. 127-144 ◽  
Author(s):  
Milan Palát ◽  
Erich Maca
Keyword(s):  
Czech Republic ◽  
Statistical Analysis ◽  
Correlation Analysis ◽  
Reference Period ◽  
The Czech Republic ◽  
Developmental Trends ◽  
Export Prices ◽  
Food Commodities ◽  
Short Time ◽  
Time Point

The paper is focused on the description of average level, variability and developmental trends the export prices of selected agricultural and food commodities in the Czech Republic with differentiation according to particular countries within the defined reference period 1993–2002. Thre is also presented the short-time point and interval extrapolation prediction of studied events. Methods of regression and correlation analysis and developmental trends were applied for the mathematical-statistical analysis.

scholarly journals A Quantitative Study on Statistical Associations between Extroversion-Introversion Personality Traits and Anxiety in Different Stages of Lockdown during the Covid-19 Pandemic

2021 ◽  
Vol 04 (12) ◽  
Author(s):  
Podchara Soemphornwiwat ◽  
Keyword(s):  
High School ◽  
High School Students ◽  
Statistical Analysis ◽  
The Other ◽  
School Students ◽  
Significance Level ◽  
Statistical Correlations ◽  
Global Pandemic ◽  
State Of Mind ◽  
The Given

The Covid-19 pandemic has caused several changes in the human state of mind, in particular adapting to the culture of the new normal while lockdown measures are implemented. This study explored the effect of the lockdown measure on the level of anxiety of high school students, comparing those identified as introverts and extroverts. Participants (N = 103) filled out the given survey, which determined that they were both introverts or extroverts and the level of anxiety that they had before, during, and after the lockdown caused by the pandemic. According to statistical analysis, the result showed that the level of anxiety perceived by those feeling the sense of extroversion was statistically higher than those with introversion, at the significance level of 95%. In addition, the analysis revealed that there was no correlation between extroverts and anxiety before, during, and after the lockdown measures. On the other hand, there were statistical correlations between the level of introversion and the level of anxiety in every stage of lockdown: before, during and after, indicating that the lockdowns due to the global pandemic did not affect extroverted people anxiety as much as it affected introverts. Moreover, it also showed that the level of anxiety of the introverts has become even more intensified even after the lockdown.

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