scholarly journals Analysis of crude mineral sample preparation schemes

2020 ◽  
pp. 68-78
Author(s):  
Vladimir Z. Kozin ◽  
Keyword(s):  
Sample Preparation ◽  
Mass Fraction ◽  
Sample Mass ◽  
The Third ◽  
Multi Stage ◽  
Mineral Sample ◽  
Model Scheme ◽  
Paradoxical Growth ◽  
Selection Of

Introduction. Sample preparation schemes are multi-stage. Sample reduction in the process of preparation introduces extra inaccuracy in the result of sampling, consequently, sample preparation schemes inaccuracy should be calculated with further selection of its rational parameters. Research methodology is based on calculation by the formula of sample reduction random inaccuracy. Inaccuracy calculation of a sample preparation scheme. Calculation has been carries out of the scheme recommended by GOST 14180-80. Paradoxical growth of inaccuracy of sample preparation has been shown with ore homogeneity growth. Determination of sample mass by the stages of preparation. Standards and techniques of ore and nonferrous metals concentrates sampling for the creation of sample preparation schemes recommend finding the coefficient in minimum mass formula depending on the mass fraction variation coefficient in the sampled product. Sample preparation is carried out in laboratory conditions, and sample mass cannot depend on this coefficient of variation. Sample inhomogeneity in the laboratory depends only on the inhomogeneity of separate lumps of a sample. Sample inhomogeneity in the preparation laboratory is defined by lump dispersion, and the coefficient is the function of this dispersion, admissible inaccuracy of sample reduction and the dimensions of grain impregnations of the mineral which contains the analyte. 78 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 1. 2020 ISSN 0536-1028 For each factory, individual coefficient can be found, and sample masses can be calculated by the stages of preparation. Analysis of sample preparation schemes. Sample preparation scheme inaccuracy formula is given. Calculation and analysis of the model scheme of sample preparation according to GOST 14180-80 have shown that at the third crushing stage the sample is advisable to be crushed not up to 3, but up to 2 mm, and the recommended sample size at the final stage 8.08 hardly improves the result of preparation, that is why the previous recommendation of 0.1 mm can be used.

scholarly journals Pengaruh Minat Belajar terhadap Prestasi Belajar Akademik dan Non Akademik Bagi Siswa pada Madrasah Aliyah (MA) Kota Samarinda

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Amrullah Amrullah
Keyword(s):  
Academic Achievement ◽  
Sampling Technique ◽  
Academic Achievements ◽  
Strong Interest ◽  
Multi Stage ◽  
Study Population ◽  
Multiple Correlation Analysis ◽  
The City ◽  
Selection Of

This research is based on the phenomenon in the field which shows that there is an influence of interest in learning on academic achievement and non-academic achievement for students at the Madrasah Aliyah (MA) of Samarinda City. This study aims to describe the influence of interest in learning on academic achievement and the effect of academic achievement on non-academic achievement for students at the Madrasah Aliyah (MA) in Samarinda city. The study population was all students of the madrasah aliyah (MA) in the city of Samarinda, totaling 2262 students. The sample was set at 663 students who sat in class XI. the determination of madrasas is determined through purposive sampling. While the selection of respondents was done using a multi-stage sampling technique which was set at 87 students (respondents). Data collection uses questionnaires, while data analysis techniques use multiple correlation analysis. The results showed that the influence of partial interest in learning contributed to a correlation of 6% with academic achievement. This means that the students of Aliyah Madrasah in Samarinda have a very strong interest in learning about academic achievement. The hypothesis which states the existence of a correlation that has significance between the influence of interest in learning and academic achievement is accepted the truth, as evidenced by the value of t count = 2.327 and the distribution table t = -3.3324. Because t counts ˃t table then H0 is rejected. At a significant level Sig.0,001 and α = 0,05 were obtained. Because α = 0.05˃ Sig. = 0.001, then H0 is rejected and the effect of partial interest in learning has a correlation of 12.1% with non-academic achievements. This means that students of the Aliyah Madrasah in Samarinda have a good or very strong interest in learning about non-academic achievements. The hypothesis which states the existence of a correlation that is significant between the influence of interest in learning and non-academic achievement is accepted, as evidenced by the value of t count = 34.20 and the distribution table t = -3.3324. Because t counts ˃t table then H0 is rejected. At a significant level Sig.0,001 and α = 0,05 were obtained. Because α = 0.05˃ Sig. = 0.001, then H0 is rejected.

scholarly journals Fuzzy Implementation in The Selection of A Chieving Employees at PT. Sumber Barkah using Matlab Software

2021 ◽  
Vol 5 (2) ◽  
pp. 170
Author(s):  
Sestri Novia Rizki
Keyword(s):  
High Standard ◽  
Inference Rules ◽  
Matlab Software ◽  
The Third ◽  
Fuzzy Process ◽  
A Company ◽  
Selection Of ◽  
Performance Target

A company must set a high standard of discipline so that the company can develop quickly. A good company cannot be separated from the performance of employees in the form of standard rules made. With the standard, the company can see employees who excel and can be used as examples for other employees. There are 3 generated criteria such as performance, target and absence. The main purpose of this study is to provide criteria for selecting outstanding employees in a company. This study uses mamdani which uses the lowest min value and uses the AND operator to get the results. There are four things in the Mamdani fuzzy process, the first is the fuzification of the determination of the input value, the second is the application of the implication function, the third is the inference rules and the last is defuzzification. The results of this study can be used as a standard in determining outstanding employees at PT Berkah

Development, validation and application of an LC-MS/MS based method for the determination of deoxynivalenol and its conjugates in different types of beer

2012 ◽  
Vol 5 (3) ◽  
pp. 261-270 ◽  
Author(s):  
A. Malachova ◽  
E. Varga ◽  
H. Schwartz ◽  
R. Krska ◽  
F. Berthiller
Keyword(s):  
Sample Preparation ◽  
Cereal Grains ◽  
Performance Parameters ◽  
Fusarium Mycotoxins ◽  
Method Performance ◽  
The Third ◽  
Low Concentrations ◽  
Relative Standard ◽  
Different Types

After water and tea, beer is the third most popular beverage worldwide. Brewed from malted cereal grains, beer is known to be potentially contaminated with mycotoxins. Some studies have shown that not only the Fusarium mycotoxins deoxynivalenol (DON) and 3-acetyl-DON (3-ADON), but also the conjugated mycotoxin deoxynivalenol-3-glucoside (D3G) can be found in beer on a regular basis, albeit usually at low concentrations. The aim of this work was to develop the first triple quadrupole LC-MS/MS based method for the determination of DON, D3G and 3-ADON in beer and to perform an in-house validation. The simple sample preparation includes degassing, precipitation of matrix compounds and reconstitution of the dried-down sample in solvent. Since different kinds of beer exist and method performance parameters will likely differ, we categorised the samples into pale, wheat, dark, bock and non-alcoholic beers, as well as shandies, and validated all six matrices. Although three individual beers for each category were spiked at eight levels prior to sample preparation, the repeatability of the overall method was still excellent with relative standard deviations from 4-16% for all analytes and types of beer. Limits of detection were in the sub- or low-μg/kg range. Apparent recoveries of 60-90% for DON, 39-69% for D3G and 96-124% for 3-ADON were obtained for the different types of beer, with dark and bock beers being the most difficult matrices. To prove the applicability of the method, ten beers of each category were analysed. While average concentrations of 6.6 μg/l for DON and D3G were found, no 3-ADON was detected in any of the samples.

scholarly journals Effect of silicon on elemental composition determination of mineral samples

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 164-168
Author(s):  
M. B. Malysheva ◽  
◽  
D. S. Bernadskaia ◽  
E. B. Roshchin ◽  
I. R. Elizarova ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Shelf Life ◽  
Elemental Composition ◽  
Silicon Content ◽  
Sample Solution ◽  
Polycondensation Reaction ◽  
Mineral Sample ◽  
Composition Determination ◽  
Silicic Acids

In this paper, the effect of the silicon content in the sample solution on obtaining reliable analysis results of macro- and microcomponents of a mineral sample is shown. The methods for sample preparation and analysis are proposed. It should be noted that it is important to take into account the polycondensation reaction of silicic acids, its effect on the shelf life of the sample without the formation of polymer forms.

A Simple Multielement-Calibration System for Analysis of Minor and Major Elements in Minerals by Fluorescent X-Ray Spectrography

1961 ◽  
Vol 5 ◽  
pp. 389-404 ◽  
Author(s):  
Merlyn L. Salmon
Keyword(s):  
Sample Preparation ◽  
Preliminary Investigation ◽  
Major Elements ◽  
Calibration System ◽  
Simple Method ◽  
Maximum Information ◽  
X Ray ◽  
Mineral Sample ◽  
Trace Concentrations

AbstractTechniques of mineral analysis by fluorescent X-ray spectrography can generally be classified on the basis of (1) extensive sample preparation and simple instrumental examination, (2) simple sample preparation and extensive instrumental examination, (3) extensive processes for both, or (4) simple processes for both major phases of the technique. The latter type of technique is usually the most commensurate with the concept “maximum information with minimum effort.”Suitable analytical results with multielement calibration systems for random mineral samples can be obtained if there are valid considerations of the relevant absorption and enhancement effects or if the systems are based on general procedures to minimize absorption and enhancement effects. Preliminary investigation indicated that control of sample mass and use of thin films of the mineral sample is a convenient and simple method of minimizing absorption and enhancement effects.Successful application of thin-film samples with known masses in a multielement calibration system is highly dependent upon details of sample preparation and comprehensive studies of these details will be discussed.The calibration system is suitable for the determination of minor and major concentrations in the sample, but it is not recommended for determination of trace concentrations.

scholarly journals Selection of Sample-preparation Method in Photometric Determination of Fluorid-Ions Mass Concentration in Waters with Metal Ions High Content

2013 ◽  
pp. 109-114
Author(s):  
Keyword(s):  
Sample Preparation ◽  
Metal Ions ◽  
Cation Exchange ◽  
Preparation Method ◽  
Photometric Determination ◽  
Sample Preparation Method ◽  
Preparation Methods ◽  
Chemical Agents ◽  
Selection Of

The article presents outcomes of investigation of effectiveness of sample preparation methods in photometric determination of fluorid-ions concentration in waters with metal ions high content: cation exchange, distillation with vapor, adding of various chemical agents. It has been stated that cation exchange and vapor distillation are effective methods of sample preparation in photometric determination of fluorid ions concentration in the solutions under investigation.

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.

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