scholarly journals Efficiency of centrifugal flotation during the refining of gold-bearing enrichment products

2018 ◽  
Vol 56 ◽  
pp. 03016
Author(s):  
Svetlana Salomatova
Keyword(s):  
Foam Layer ◽  
Inclined Plane ◽  
Hydrophobic Properties ◽  
Flotation Machine ◽  
Mineral Separation ◽  
Mineral Particles ◽  
Ore Processing ◽  
Series Of Experiments ◽  
Gold Bearing

The results of enriching the products of gold-antimony ore processing using centrifugal flotation are presented. A series of experiments was conducted on a laboratory centrifugal flotation machine with peripheral unloading of concentrate (CFM) and on a laboratory mechanical flotation machine (FM). The selectivity of deposition of mineral particles from the flotation mineralized foam flowing on an inclined plane after flotation under different conditions (with a collector and without the use of a collector) has been studied. It has been shown that it is possible to regulate the intensity and selectivity of deposition of material from the foam layer by using a collector. It is established that the combination of the effect of the centrifugal force of fluid rotation and the hydrophobic properties of minerals makes it possible to strengthen the selectivity of mineral separation, flotation in a centrifugal flotation machine can be used for purification operations with the aim of improving the quality of concentrate.

scholarly journals Extraction of gold in a centrifugal field of fluid rotation

2020 ◽  
Vol 192 ◽  
pp. 02006
Author(s):  
Svetlana Salomatova
Keyword(s):  
Centrifugal Force ◽  
Foam Layer ◽  
Centrifugal Field ◽  
Inclined Plane ◽  
Hydrophobic Properties ◽  
Flotation Machine ◽  
Mineral Particles ◽  
Ore Processing

With the samples of the gold-antimony ore processing products of the Sentachan deposit, flotation experiments were carried out on a laboratory centrifugal flotation machine with peripheral concentrate discharge (CFM) and on a laboratory mechanical flotation machine (FM). The selectivity of falling of mineral particles from the flotation mineralized foam flowing along the inclined plane after flotation under different modes (with and without the use of a collector) was investigated; it was shown that the use of a collector can regulate the intensity and selectivity of the falling of material from the foam layer. It was found that the combination of the effect of the centrifugal force of fluid rotation and the hydrophobic properties of minerals makes it possible to enhance the selectivity of the separation of minerals; during flotation in a centrifugal flotation machine, it is possible to carry out cleaning operations in order to improve the quality of the concentrate.

The fate of formaldehyde in sugar manufacture and in products

2015 ◽  
pp. 692-696
Author(s):  
Remi Aubry ◽  
Laurence Gasnot
Keyword(s):  
Sugar Industry ◽  
Common Knowledge ◽  
Microbial Populations ◽  
Optimal Dosage ◽  
Consumer Health ◽  
Microbiological Activity ◽  
Specific Process ◽  
Beet Sugar ◽  
Series Of Experiments

A study was carried out in six beet sugar factories in France during the 2012/13 sugar campaign. The objective was to assess the optimal dosage of formaldehyde solutions at specific process stages and in different existing factory set-ups in order to obtain the desired effect on microbial populations, without interference with the quality of the products. In addition harmlessness regarding consumer health was to be demonstrated. A series of experiments was conducted resulting in new data allowing refreshment of common knowledge and references existing regarding the use of formaldehyde solutions in the sugar industry. The effectiveness and convenience for controlling microbiological activity in beet sugar manufacture was assessed. Formaldehyde reduces sugar losses and protects in-process products without harming their further use, such as for ethanol production.

THE RULE OF COMBINING A PRIORI AND EXPERIMENTAL INFORMATION IN THE TASKS OF MANAGING TESTS OF COMPLEX TECHNICAL PRODUCTS ACCORDING TO THE BERNOULLI SCHEME

2020 ◽  
pp. 3-13
Author(s):  
Yu. I. Buryak ◽  
A. A. Skrynnikov
Keyword(s):  
Field Experiments ◽  
A Priori ◽  
Field Tests ◽  
Experimental Information ◽  
Full Scale ◽  
Testing Complex ◽  
Series Of Experiments ◽  
Full Scale Tests ◽  
Technical Products

The article is devoted to the substantiation of the procedure for testing complex technical systems to assess the probability of performing the task, taking into account a priori data obtained from the results of modeling, field tests of components and prototypes, operation of analogues, etc. The conditions for the formation of a combined sample consisting of field experiments and experiments counted on the results of modeling are justified. Data uniformity is checked using the Student's criterion. The minimum volume of full-scale tests is determined by the requirement of equality of the amount of Fischer information about the estimated parameter obtained during full-scale tests and at the expense of a priori data A strategy for conducting field experiments is proposed, in which the required quality of evaluating the probability of completing the task is achieved with the minimum possible number of field experiments. At the first stage, a series of experiments with a volume equal to half of the required sample size is performed. At the second stage, the experiments are conducted sequentially with an assessment after each experiment of the requirements for the amount of information about the evaluated parameter and for the uniformity of data. Experiments are terminated when the specified requirements are met, and then a combined sample is formed, which is used to evaluate the probability of the system performing the task. A model example is considered. The estimation of the gain in the number of experiments performed at different probability values was carried out.

scholarly journals Properties of Humic Acids in Meadow Soils Irrigated With the Slope-And Flooding System

2021 ◽  
Author(s):  
Magdalena Banach-Szott ◽  
Andrzej Dziamski
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Organic Carbon ◽  
Humic Acids ◽  
Soil Samples ◽  
Hydrophobic Properties ◽  
Irrigation Ditch ◽  
Ft Ir ◽  
Degree Of Maturity

Abstract The aim of the research has been to determine the effect of many-year irrigation of unique grasslands on the properties of humic acids defining the quality of organic matter. The research was performed based on the soil (Albic Brunic Arenosol, the A, AE and Bsv horizons) sampled from Europe’s unique complex of permanent grasslands irrigated continuously for 150 years, applying the slope-and-flooding system; the Czerskie Meadows. The soil samples were assayed for the content of total organic carbon (TOC) and the particle size distribution. HAs were extracted with the Schnitzer method and analysed for the elemental composition, spectrometric parameters in the UV-VIS range, hydrophilic and hydrophobic properties and the infrared spectra were produced. The research results have shown that the HAs properties depended on the depth and the distance from the irrigation ditch. The HAs of the A horizon of the soils were identified with a lower “degree of maturity”, as reflected by the values of atomic ratios (H/C, O/C, O/H), absorbance coefficients, and the FT-IR spectra, as compared with the HAs of the Bsv horizon. The HAs molecules of the soils sampled furthest from the irrigation ditch were identified with a higher degree of humification, as compared with the HAs of the soils sampled within the closest distance. The results have demonstrated that many-year grassland irrigation affected the structure and the properties of humic acids.

Crossmodal correspondences between chemosensory stimuli and musical notes

2012 ◽  
Vol 25 (0) ◽  
pp. 72
Author(s):  
Anne-Sylvie Crisinel ◽  
Charles Spence
Keyword(s):  
Musical Instruments ◽  
Crossmodal Correspondences ◽  
Musical Note ◽  
Water Based ◽  
Different Types ◽  
Potential Applications ◽  
Series Of Experiments ◽  
Components Analysis ◽  
Psychological Dimensions

We report a series of experiments investigating crossmodal correspondences between various food-related stimuli (water-based solutions, milk-based flavoured solutions, crisps, chocolate and odours) and sounds varying in pitch and played by four different types of musical instruments. Participants tasted or smelled stimuli before matching them to a musical note. Our results demonstrate that participants preferentially match certain stimuli to specific pitches and instrument types. Through participants’ ratings of the stimuli along a number of dimensions (e.g., pleasantness, complexity, familiarity or sweetness), we explore the psychological dimensions involved in these crossmodal correspondences, using principal components analysis (PCA). While pleasantness seems to play an important role in the choice of instrument associated with chemosensory stimuli, the pitch seems to also depend on the quality of the taste (bitter, salty, sour or sweet). The level at which such crossmodal correspondences might occur, as well as the potential applications of such results, will be discussed.

Affective Quality of Audio Feedback on Mobile Devices in Different Contexts

2014 ◽  
Vol 6 (4) ◽  
pp. 1-21 ◽  
Author(s):  
Julia Seebode ◽  
Robert Schleicher ◽  
Sebastian Möller
Keyword(s):  
Mobile Devices ◽  
Evaluation Method ◽  
User Performance ◽  
Emotional Stimuli ◽  
Audio Feedback ◽  
Affective Quality ◽  
Specific Feedback ◽  
Series Of Experiments ◽  
Mobile Phone Usage

Sound is a common means to give feedback on mobile devices. Much research has been conducted to examine the learnability and user performance with systems that provide audio feedback. In many cases a training period is necessary to understand the meaning of a specific feedback, because their functional connotation may be ambiguous. Additionally, no standardized evaluation method to measure the subjective quality of these messages has been established; especially regarding the affective quality of feedback sounds. The authors describe a series of experiments to investigate the affective impression of audio feedback on mobile devices as well as their functional meaning under varying contexts prototypical for mobile phone usage. Results indicate that context influences the emotional impression and that there is a relation between affective quality and functional appropriateness. These findings confirm that emotional stimuli are suitable as feedback messages in the context of mobile HCI and that context matters for the affective quality of sounds emitted by mobile phones.

Nano-Precision Finishing Technology Based on Magnetorheological Finishing

2009 ◽  
Vol 416 ◽  
pp. 118-122 ◽  
Author(s):  
Yao Ming Li ◽  
Xing Quan Shen ◽  
Ai Ling Wang
Keyword(s):  
Surface Roughness ◽  
Advanced Technology ◽  
Technological Parameters ◽  
Magnetorheological Finishing ◽  
Shape Precision ◽  
Surface Destruction ◽  
Series Of Experiments ◽  
Precision Finishing ◽  
Better Than

Surface roughness is normally regarded as an important criterion for assessing the quality of optic elements; surface roughness of a high-quality optic element is required to be less than RMS1nm. In this paper, a series of experiments has been conducted on the sample magnetorheological finishing machine by using self-prepared magnetorheological liquid as finishing liquid, to assess the removing efficiency of magnetorheological finishing. Optimization of technological parameters enables the authors to obtain a glass-ware with an ideal surface roughness of RMS0.56nm. Magnetorheological finishing (MRF) is an advanced technology for processing optic elements that has been developed in recent years. The technology polishes optic elements by using viscoplastic soft media produced by the MRF liquid under the variation of gradient magnetic field. Better than traditional polishing method in shape precision, surface roughness and inner surface destruction, MRF is an ideal technology for obtaining super-precision optic surface.

Image Quality of Two-Primary Color Active-Matrix Liquid-Crystal Displays

1997 ◽  
Vol 39 (4) ◽  
pp. 618-641 ◽  
Author(s):  
David L. Post ◽  
William F. Reinhart
Keyword(s):  
Liquid Crystal ◽  
Image Quality ◽  
Liquid Crystal Display ◽  
Active Matrix ◽  
Primary Color ◽  
Aperture Ratio ◽  
Full Color ◽  
Series Of Experiments ◽  
Matrix Liquid

The demand for color head- and helmet-mounted displays (HMDs) is growing. Interest focuses on full-color systems, but a limited color repertoire is sufficient for some applications and can reduce cost and complexity significantly, especially when subtractive-color active-matrix liquid-crystal display (AMLCD) technology is used. We report a series of experiments that investigated important questions about the design and merits of two-primary color AMLCDs for HMD applications. Our main conclusion is that the image quality of a subtractive-color AMLCD with high (≥70%) aperture ratio is superior to a comparable, conventional color AMLCD. Evidence regarding requirements for resolution, aperture ratio, and gray scale is also provided.

scholarly journals Comprehensive solving tasks of deep processing of titanium-magnetite ores

2020 ◽  
Vol 76 (1) ◽  
pp. 12-18
Author(s):  
S. V. Kornilkov ◽  
A. N. Dmitriev ◽  
A. E. Pelevin
Keyword(s):  
Raw Materials ◽  
New Technology ◽  
Ural Region ◽  
Technological Scheme ◽  
Deep Processing ◽  
Magnetite Concentrate ◽  
Ore Processing ◽  
Equipment Modernization ◽  
Titanium Magnetite

Despite the plants of the Ural region have significant mining capacities, they are buying raw materials from other regions, therefore the task of wastes minimization is a perspective of supporting their raw materials base. A technology was proposed to increase the quality of titanium-magnetite concentrate, comprising dividing of the ore into two technological grades – a rich and a poor ones following separate crushing and concentration of the grades at separate sections. Due to this technological scheme, the ore is divided into easy-concentrated and hard-concentrated grades at the concentration stage, but not at the stages of preparation to development, mining, transporting and crushing. The advantage of the new technology is the relative simplicity of equipment modernization, since the technological scheme of the ore processing is modified only at the concentration plant. Under laboratory conditions, an iron-vanadium concentrate with iron content of 67.1% and vanadium pentoxide of 0.6% was obtained.

Further Experiments in Language Translation

1973 ◽  
Vol 19 ◽  
pp. 29-52 ◽  
Author(s):  
H. Wallace Sinaiko ◽  
R.George Klare
Keyword(s):  
Rating Scale ◽  
Reading Speed ◽  
Language Translation ◽  
Control Group ◽  
Highly Qualified ◽  
Cloze Procedure ◽  
Series Of Experiments ◽  
Control Instruction ◽  
Comprehension Tests

Abstract Language translation by computer has been proposed as a solution to the backlog of training and operational manuals awaiting translation by more conventional means. This study reports one of a series of experiments to assess the quality of translations produced by human translators and computers. The type of material under study was technical text (i.e., maintenance manuals) and the translation was from English to Vietnamese. Utility or readability of the translations was assessed by reading comprehension tests, the cloze procedure (in which readers filled in blanks where words had been systematically deleted) and a rating scale for judging clarity. Time to perform each of these tasks was also measured. The subjects were 141 Vietnamese Navy officer candidates and a control group of 57 U.S. Navy officer candidates. A 500-word passage, from a U.S. Navy casualty control instruction, was translated by computer into a rough (un-edited) and a finished (post-edited) version; also, highly competent human translators prepared a Vietnamese text. Some Vietnamese subjects served as controls and took all tests based on the English, or untranslated, version. Major conclusions were: (1) Translations produced by highly qualified humans were consistently more comprehensible than those produced by computer, whether edited or un-edited; post-edited versions of computer produced text were more comprehensible than unedited ones; most differences were not statistically significant; (2) Vietnamese Navy officer candidates were able to read text in English as well as its best Vietnamese version and their test scores were about as high as those of American control subjects. Reading speed was not affected by mode of translation.

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