scholarly journals The Inadvertent Activation of Silicate Minerals Flotation and Their Depression in Molybdenite Beneficiation

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1296
Author(s):  
Yu Miao ◽  
Tao Long ◽  
Jingjun Wang ◽  
Fu Lai ◽  
Weiran Zuo ◽  
...  
Keyword(s):  
Water Glass ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Diagnostic Analysis ◽  
Silicate Minerals ◽  
Analysis Techniques ◽  
Molybdenum Concentrate

The Wushan Operation has been studied as a case study, particularly relevant to the copper-molybdenum separation circuit, in which efforts have been made to improve the quality of the molybdenum concentrate through diagnostic analysis. A key finding has been the appearance of coarser silicate minerals in the molybdenum concentrate due to their inadvertent activation in flotation. The suitable silicate minerals flotation conditions occurs, most likely, due to upstream bulk flotation regarding the usage of novel collectors and metal cations bearing process water. The flotation of silicate minerals can be diminished by the implementation of water glass and regrinding. The mechanisms underlying flotation behaviors have been revealed by using advanced in-situ surface analysis and particle size analysis techniques.

scholarly journals Practical Functioning of a Sustainable Urban Complex with a Park—The Case Study of Stavros Niarchos Foundation Cultural Center in Athens

2021 ◽  
Vol 13 (9) ◽  
pp. 5071
Author(s):  
Beata Makowska
Keyword(s):  
Urban Space ◽  
Public Spaces ◽  
Green Spaces ◽  
Cultural Center ◽  
Urban Green ◽  
Urban Green Spaces ◽  
Urban Complex

Intensive urban development has created a shortage of urban green areas. The need to economically plan and use urban green spaces has fueled the redefinition of public spaces and parks so as to provide the residents with both recreation and relaxation facilities, as well as a forum for contact with culture. This paper discusses the case of the Stavros Niarchos Foundation Cultural Center (SNFCC) in the Kallithea district on the outskirts of Athens, near the Mediterranean Sea. It fills a gap in the research on the aspects of the practical functioning of such facilities. The methodology used in the research included an analysis of the literature, the SNFCC’s reports, and an in situ survey. The cultural center hosts a number of events aimed at promoting Greece’s natural and cultural heritage. The paper includes a detailed analysis of the events organized by the SNFCC in the period 2017–2020 and their immense impact on residents. The aim of the study is to show that the creation of the SNFCC with the park areas has functioned as a factor contributing to the improvement of the quality of urban space and the quality of life of the city’s inhabitants. The paper’s conclusions indicate that the sustainable SNFCC project, which fulfils the urban ecology criteria, has been very well received by the visitors—citizens and tourists alike. A program-centered innovation introduced by the SN Park has added great value to their lives. The project contributes to economic and cultural growth, as well as the protection and promotion of heritage.

scholarly journals The extreme runoff index for flood early warning in Europe

2014 ◽  
Vol 14 (6) ◽  
pp. 1505-1515 ◽  
Author(s):  
L. Alfieri ◽  
F. Pappenberger ◽  
F. Wetterhall
Keyword(s):  
Early Warning ◽  
Input Data ◽  
Weather Forecasting ◽  
Spatial Inhomogeneity ◽  
Optimal Timing ◽  
Numerical Predictions ◽  
In Situ Observations

Abstract. Systems for the early detection of floods over continental and global domains have a key role in providing a quick overview of areas at risk, raise the awareness and prompt higher detail analyses as the events approach. However, the reliability of these systems is prone to spatial inhomogeneity, depending on the quality of the underlying input data and local calibration. This work proposes a simple approach for flood early warning based on ensemble numerical predictions of surface runoff provided by weather forecasting centers. The system is based on a novel indicator, referred to as an extreme runoff index (ERI), which is calculated from the input data through a statistical analysis. It is designed for use in large or poorly gauged domains, as no local knowledge or in situ observations are needed for its setup. Daily runs over 32 months are evaluated against calibrated hydrological simulations for all of Europe. Results show skillful flood early warning capabilities up to a 10-day lead time. A dedicated analysis is performed to investigate the optimal timing of forecasts to maximize the detection of extreme events. A case study for the central European floods of June 2013 is presented and forecasts are compared to the output of a hydro-meteorological ensemble model.

scholarly journals PREPARATION AND CHARACTERIZATION OF ANTI-ACNE ETHOSOMES USING COLD AND THIN-LAYER HYDRATION METHODS

2018 ◽  
Vol 10 (1) ◽  
pp. 338
Author(s):  
Rachmawati Ramadhana Mustofa ◽  
Iskandarsyah .
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Thin Layer ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Multilamellar Vesicles ◽  
Zeta Potentials ◽  
Small Unilamellar Vesicles

Objective: This study aimed to prepare and characterize anti-acne ethosomes using the cold- and thin-layer hydration methods.Methods: A sonication step was included during ethosome preparation to improve the quality of the cold method. Azelaic acid, Phospholipon 90G,ethanol, propylene glycol, and phosphate buffer (pH 7.4) were used in the procedures. Prepared ethosomal suspensions were characterized usingtransmission electron microscopy, particle-size analysis, and spectrophotometry.Results: Ethosomes prepared using the thin-layer hydration method (F1) had small unilamellar vesicles, while those prepared using the cold methodwith 15-min sonication (F4) showed spherical, elliptical, unilamellar, and multilamellar vesicles. F1 ethosomes had a Dmean volume of 648.57±231.26,whereas those prepared using the cold method with 5- (F2), 10- (F3), and 15-min (F4) sonication had Dmean volumes of 2734.04±231.49 nm,948.90±394.52 nm, and 931.69±471.84 nm, respectively. Polydispersity indices of F2, F3, and F4 ethosomes were 0.74±0.21, 0.86±0.05, and 0.91±0.03,respectively, with a poor particle-size distribution, compared to that of F1 (0.39±0.01). Zeta potentials of F1–F4 ethosomes were −38.27±1.72 mV,−23.53±1.04 mV, −31.4±1.04 mV, and −34.3±1.61 mV, respectively. Entrapment efficiencies of F1–F4 ethosomes were 90.71±0.11%, 53.84±3.16%,72.56±0.28%, and 75.11±1.42%, respectively.Conclusion: Anti-acne ethosomes produced using the thin-layer hydration method had superior properties than those produced using the coldmethod with 15-min sonication.

scholarly journals Validity of particle size analysis techniques for measurement of the attrition that occurs during vacuum agitated powder drying of needle-shaped particles

The Analyst ◽  
2012 ◽  
Vol 137 (1) ◽  
pp. 118-125 ◽  
Author(s):  
Peter Hamilton ◽  
David Littlejohn ◽  
Alison Nordon ◽  
Jan Sefcik ◽  
Paul Slavin
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Analysis Techniques

Characterization and Granulometric Correction Soil for the Production of Soil-Cement Blocks for Two Method, Particle Size and X-Ray Florescence to be Inserted in Phase Change Materials (PCMS)

2014 ◽  
Vol 798-799 ◽  
pp. 355-359 ◽  
Author(s):  
Valter Bezerra Dantas ◽  
U.U. Gomes ◽  
A.B. Vital ◽  
G.S. Marinho ◽  
Ariadne de Souza Silva
Keyword(s):  
Particle Size ◽  
Phase Change Materials ◽  
Clay Content ◽  
Particle Size Analysis ◽  
Liquid Limit ◽  
Size Analysis ◽  
X Ray ◽  
Soil Cement

This paper presents the results of tests for characterization of soil samples collected in Mossoró-RN, UFERSA-RN Campus (5 ° 12'34 .68 "South latitude, 37 ° 19 '5.74 "west longitude), for the purpose of producing soil-cement for the manufacture of pressed blocks. Objective of improving the quality of soil-cement, and provide conditions for the use of the soil making it ideal for the production of soil-cement block. Tests of compaction, particle size analysis, plastic limit, liquid limit and correct particle size, X-ray fluorescence and morphology by scanning electron microscopy (SEM). It was concluded that the soil needs correction particle size, due to the high clay content. The method combined grading, sieving, sedimentation and blooming X-ray as the fastest and most accurate in correcting soil particle size.

The Effect of Silica Fused Addition as Filler on Zircon Based Refractory Coating

2020 ◽  
Vol 988 ◽  
pp. 23-29
Author(s):  
Davino Aditya Dwinanda ◽  
Donanta Dhaneswara ◽  
Bionolla Shandiana
Keyword(s):  
Particle Size ◽  
Simultaneous Thermal Analysis ◽  
Casting Process ◽  
Particle Size Analysis ◽  
Partial Substitution ◽  
Size Analysis ◽  
Refractory Coating ◽  
Alternative Material ◽  
Thermal Stability Of

Refractory coating is widely used in metal casting process to protect the mold from direct contact with molten metal. This coating also could improve the surface quality of casting product. Zircon is common materials that used as filler, but the materials cost is quite high. Therefore, alternative material is needed to make partial substitution of the filler. Silica Fused can be considered as filler because it has good refractoriness. This study aims to determine silica fused is reliable as an alternative to substitute zircon filler. The samples were made with 16%, 18%, and 20% silica fused addition and different treatment which were heated and non-heated drying. Particle size and distributions of the filler were analyzed using Particle Size Analysis. Viscosity measurement has been done to coating slurry to analyze the rheological characteristics of the slurry. The surface morphology of dried coating was taken using Scanning Electron Microscope. XRD test also has been done to analyse the compound. The quality of coating was determined from the thermal stability of the coating that was analyzed using Simultaneous Thermal Analysis. The result shows that silica fused is reliable as an alternative material for filler partial substitution.

scholarly journals Importance of Combining Advanced Particle Size Analysis Techniques To Characterize Cell-Penetrating Peptide–Ferrocifen Self-Assemblies

2019 ◽  
Vol 10 (21) ◽  
pp. 6613-6620 ◽  
Author(s):  
Léna Guyon ◽  
Elise Lepeltier ◽  
Jean-Christophe Gimel ◽  
Brice Calvignac ◽  
Florence Franconi ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Cell Penetrating Peptide ◽  
Analysis Techniques ◽  
Cell Penetrating

Carbon Quality of Four-Year-Old Woodchips in a Denitrification Bed Treating Agricultural Drainage Water

2018 ◽  
Vol 61 (3) ◽  
pp. 995-1000 ◽  
Author(s):  
Ehsan Ghane ◽  
Gary W. Feyereisen ◽  
Carl J. Rosen ◽  
Ulrike W. Tschirner
Keyword(s):  
Particle Size ◽  
Drainage Water ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Agricultural Drainage ◽  
Carbon Quality ◽  
The Mean ◽  
Lignocellulose Index ◽  
Effect Of Age

Abstract. A denitrification bed is a system that can reduce the nitrate concentration in subsurface drainage water. There is a need to investigate the carbon quality of old woodchips to gain a better understanding of the effect of age on woodchip properties. The objectives of this study were to characterize the carbon quality and carbon to nitrogen (C/N) ratio of aged woodchips and to examine the suitability of a denitrification bed for a replicated experiment. To achieve these goals, we excavated four-year-old woodchips along the length of a 106.4 m long denitrification bed near Willmar, Minnesota, and analyzed them for particle size, C/N ratio, and carbon quality. Particle size analysis showed similarities from 12.5 to 106.4 m along the bed. We found a mean C/N ratio ranging from 58.4 ±3.17 to 153.4 ±9.57 (smallest at the inlet). The mean lignocellulose index (LCI, a measure of carbon quality) of the four-year-old woodchips ranged from 0.47 to 0.57 (highest at the inlet). The woodchip particle sizes, C/N ratios, and LCI from 25.9 to 106.4 m along the bed length were similar. In conclusion, the C/N ratio and LCI of the four-year-old woodchips showed effects of decomposition and increased woodchip carbon recalcitrance over time, respectively. Keywords: Denitrifying bioreactor, Tile drainage, Water quality, Woodchip bioreactor.

Particle size analysis techniques for suspension concentrates

1976 ◽  
Vol 7 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Andreas G. Kanellopoulos ◽  
Richard J. Wood
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Analysis Techniques

scholarly journals The Strategy of Madrasah Headmaster in Improving The Quality of Islamic Education

2019 ◽  
Vol 1 (1) ◽  
pp. 103-124
Author(s):  
Sakinah Sakinah ◽  
Asy’ari Asy’ari ◽  
Moh. Ali
Keyword(s):  
Analysis Data ◽  
Community Response ◽  
Islamic Education ◽  
Case Study Approach ◽  
Human Relationships ◽  
Data Presentation ◽  
Analysis Techniques ◽  
Study Approach

This study examines the strategies of madrasa headmasters in improving the quality of Islamic Education and the facilitating and hindering factors as well as the solutions of the headmaster's strategies in improving the quality of Islamic Education in Madrasah Tsanawiyah. This study used descriptive qualitative and research design using a case study approach. The data were collected using observation, interview, and documentation techniques. Data analysis techniques through data reduction analysis, data presentation, and data verification which ended with checking the validity of the data. The results showed that: 1) The strategy employed by the madrasah headmaster in improving the quality of Islamic Education begins with an analysis of the internal and external environment of the madrasa which includes strengths and weaknesses, as well as the threats and opportunities. Head of Madrasah TsanawiyahAlkhairaatSibalaya always builds harmony in the organization, for example, being able to place personnel appropriately and influence his subordinates in human relationships which are covered by authority situations, enforce discipline to all madrasa personnel, and empower teachers to improve their competency and evaluate by involving relevant and professional related parties.2) The supporting factors are harmonious cooperation with subordinates as well as the conducive and comfortable situation and conditions of the madrasa. Meanwhile, inhibiting factors are the lack of teachers' discipline and lack of community response to send their children to madrasas.

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