scholarly journals New Approach in Research of Quartzes and Quartzites for Ferroalloys and Silicon Production

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 670
Author(s):  
Jaroslav Legemza ◽  
Róbert Findorák ◽  
Branislav Buľko ◽  
Jaroslav Briančin
Keyword(s):  
Raw Materials ◽  
Electricity Consumption ◽  
Process Conditions ◽  
Material Research ◽  
New Approach ◽  
Pure Silicon ◽  
Metallurgical Properties ◽  
Similar Chemical ◽  
The Individual ◽  
Individual Grains

This article deals with material research of selected types of quartz and quartzites in order to determine the priority of their use in the production of ferrosilicon and pure silicon, respectively. The highest quality quartzes and quartzites are commonly used in metallurgy, but not all types of these silicon raw materials are suitable for the production of ferrosilicon and pure silicon, despite their similar chemical composition. Behavior differences can be observed in the process conditions of heating and carbothermic production of ferrosilicon and silicon. These differences depend, in particular, on the nature and content of impurities, and the granularity (lumpiness) and microstructure of individual grains. The research focused primarily on determining the physicochemical and metallurgical properties of silicon raw materials. An integral part of the research was also the creation of a new methodology for determining the reducibility of quartzes (or quartzites), which could be used for real industrial processes and should be very reliable. The results of the laboratory experiments and evaluation of the physicochemical and metallurgical properties of the individual quartzes (or quartzites) are presented in the discussion. Based on comparison of the tested samples’ properties, their priority of use was determined. This research revealed the highest quality in quartzite from Sweden (Dalbo deposit) and Ukraine (Ovruč deposit) and quartz from Slovakia (Švedlár deposit). The use of these raw materials in industrial conditions is expected to result in the achievement of better production parameters, such as higher yield and product quality and lower electricity consumption.

scholarly journals Manufacture of heat-insulating products from solid municipal waste using new waste segregation

2020 ◽  
Vol 22 (3) ◽  
pp. 119-131
Author(s):  
А. А. Muratova ◽  
Yu. N. Kartushina
Keyword(s):  
Raw Materials ◽  
Municipal Waste ◽  
Process Conditions ◽  
Labor Costs ◽  
Recovery Coefficient ◽  
New Approach ◽  
Main Research ◽  
Environmental Criteria ◽  
Solid Municipal Waste ◽  
Waste Segregation

The paper considers the improvement of the process conditions for the extraction of high-quality components from solid municipal waste (MSW) for the manufacture of heat-insulating products. A new approach to waste processing with the component extraction is required, and new materials are being sought for heat-insulating products.The purpose of this work is to select the optimum method of MSW segregation, which will be applicable to the morphological composition of wastes in Russia to obtain cleaner raw materials. The main problems of waste segregation are high content of organic waste polluting the components and equipment, low automation and recovery coefficient of waste components due to a single run of waste.The main research methods include a comparative analysis of technological and environmental criteria and labor costs of MSW segregation differing in Russia and abroad.The proposed new method of MSW segregation requires new approaches to the waste use for the production of modern materials. The first problem to be solved is MSW segregation and preparation for further utilization. A search for new, eco-friendly, safe and economically feasible heat-insulating materials is important in the construction field. The proposed method will increase the recovery rate of waste fractions and productivity per unit time.

Inorganic acids – technology background and future perspectives

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Filip Ciesielczyk
Keyword(s):  
Environmental Impact ◽  
Raw Materials ◽  
Process Conditions ◽  
Future Perspectives ◽  
Main Attention ◽  
Inorganic Acids ◽  
Innovative Solutions ◽  
Scientific Papers ◽  
Acid Anhydrides ◽  
The Individual

AbstractThe presented chapter deals with technological aspects concerning industrial production of major inorganic chemicals such as sulfuric, nitric and phosphorous acids. The idea was to highlight the main assumptions related to their fabrication as well as to point out novel aspects and perspectives concerning their industry. The main attention will be paid to raw materials and their transformation in order to obtain indirect precursors of inorganic acids – acid anhydrides. Characteristics of the individual stages of synthesis, with a special regard to the process conditions will be also of key importance. The environmental impact of this particular technology will be raised and discussed. Finally, the review over recently published scientific papers, concerning innovative solutions in inorganic acids production, will be performed.

On the diagnostics of Adonis L. species (Ranunculaceae) of the Russian flora

2020 ◽  
pp. 3-14
Author(s):  
Aleksandr Luferov
Keyword(s):  
Raw Materials ◽  
Natural Populations ◽  
Structural Features ◽  
Biologically Active ◽  
Scientific Medicine ◽  
Diagnostic Features ◽  
Plant Raw Materials ◽  
Similar Chemical ◽  
Chemical Studies ◽  
Alternative Sources

The article provides brief information about cardiotonic, sedative, cytostatic, diuretic, and antibacterial effects of biologically active compounds of Adonis L. (Ranunculaceae) species. Chemical studies allowed to identify the cardiac glycosides, or cardenolides: or cardenolides: adontoxin, adonitol, adonitoxigenin, acetyldigitoxin and others. In scientific medicine, it is currently allowed to use Adonis vernalis L. Other types of Adonis have a similar chemical composition and are offered as substitutes for this official species, for example, Adonis apennina L. Many Adonis species have limited natural resources, and in some regions are rare, requiring conservation of their natural populations. The search for alternative sources of medicinal plant raw materials, based on this, is relevant. The experimental part of our research was carried out using the morphological and geographical method with the involvement of information on ecology and phenology. For the first time summarizes the diagnostic features of Adonis flora of Russian flora. Previously unknown structural features (shape and size of anthers) were identified that characterize the subgenera Adonanthe and Adonis. Taxonomic study of the genus Adonis of the Russian flora allowed us to determine its species composition, clarify its systematic affiliation, and nomenclature synonyms. 9 species were identified. Of these, 6 are perennials belonging to the subgenus Adonanthe, section Consiligo, which includes 2 subsections: Amurenses (2 species) and Vernales, which is differentiated into 2 rows: Apenninae (2 species) and Vernales (2 species). Subgenus Adonis is represented by 2 sections: Adonis (1 species) and Lophocarpa with sections Aestivales (1 species) and Dentatae (1 species). For all the considered species and varieties, the main distribution areas are given. A key has been compiled to determine the wild Adonis species distributed in Russia.

In silico modeling of cellular probabilistic nanoparticle radiosensitization in head and neck cancers

Nanomedicine ◽  
2020 ◽  
Vol 15 (29) ◽  
pp. 2837-2850
Author(s):  
Myxuan Huynh ◽  
Ivan Kempson ◽  
Eva Bezak ◽  
Wendy Phillips
Keyword(s):  
Head And Neck ◽  
Patient Outcomes ◽  
Head And Neck Cancers ◽  
New Approach ◽  
Treatment Regimens ◽  
Therapeutic Benefits ◽  
In Silico Modeling ◽  
The Individual ◽  
Dose Deposition ◽  
Therapy Treatment

Background: The use of gold nanoparticles (AuNPs) as radiosensitizers may offer a new approach in the treatment of head and neck cancers; minimizing treatment-associated toxicities and improving patient outcomes. AuNPs promote localized dose deposition; permitting improved local control and/or dose reduction. Aim: This work aimed to address the theoretical optimization of radiation doses, fractionation and nanoparticle injection schedules to maximize therapeutic benefits. Materials & methods: Probabilistic nanoparticle sensitization factors were incorporated into the individual cell-based HYP-RT computer model of tumor growth and radiotherapy. Results: Total dose outcomes across all radiation therapy treatment regimens were found to be significantly reduced with the presence of AuNPs, with bi-weekly injections showing the most decrease. Conclusion: Outcomes suggest the need for regular AuNP administration to permit effective radiosensitization.

scholarly journals Sustainable Geographical Changes in Rural Areas: Key Paths, Orientations and Limits

2021 ◽  
Vol 13 (4) ◽  
pp. 2059
Author(s):  
Angel Paniagua
Keyword(s):  
Rural Areas ◽  
Anglo Saxon ◽  
Rural Studies ◽  
New Approach ◽  
Rural Restructuring ◽  
Theoretical Approaches ◽  
Methodological Approaches ◽  
Social Environmental ◽  
The Individual ◽  
New Rurality

Rural differentiation processes have formed the backbone of rural studies. Owing to the strength of rural–urban and local–global relationships, the theoretical approaches to rural restructuring in the Anglo-Saxon world and new rurality in Latin America only have a limited capacity to explain contemporary global phenomena of rural spaces. Due to this, transverse theoretical and methodological approaches have emerged to explain social, environmental and spatial (rural) processes. Here, a new approach is proposed called the individual–global field, based on the individual–global binary category to substitute the traditional relevance of the locality–community–globality association This new approach tries to reinvigorate rural geography in a more flexible way, based on minor theory, to adapt to all the phenomena that can occur globally. In any case, various spatial planes are proposed, dominated by specific socioeconomic processes on which the rural individual would move.

scholarly journals Individualized Hemodynamic Management in Sepsis

2021 ◽  
Vol 11 (2) ◽  
pp. 157
Author(s):  
Marcell Virág ◽  
Tamas Leiner ◽  
Mate Rottler ◽  
Klementina Ocskay ◽  
Zsolt Molnar
Keyword(s):  
Fluid Overload ◽  
Fluid Management ◽  
Multiple Organ ◽  
Treatment Protocols ◽  
Hemodynamic Management ◽  
New Approach ◽  
Hemodynamic Optimization ◽  
The Individual ◽  
Sepsis And Septic Shock ◽  
Insight Into

Hemodynamic optimization remains the cornerstone of resuscitation in the treatment of sepsis and septic shock. Delay or inadequate management will inevitably lead to hypoperfusion, tissue hypoxia or edema, and fluid overload, leading eventually to multiple organ failure, seriously affecting outcomes. According to a large international survey (FENICE study), physicians frequently use inadequate indices to guide fluid management in intensive care units. Goal-directed and “restrictive” infusion strategies have been recommended by guidelines over “liberal” approaches for several years. Unfortunately, these “fixed regimen” treatment protocols neglect the patient’s individual needs, and what is shown to be beneficial for a given population may not be so for the individual patient. However, applying multimodal, contextualized, and personalized management could potentially overcome this problem. The aim of this review was to give an insight into the pathophysiological rationale and clinical application of this relatively new approach in the hemodynamic management of septic patients.

scholarly journals A new catalogue of multiple galaxies in the Local Supercluster

2000 ◽  
Vol 174 ◽  
pp. 40-45
Author(s):  
D. I. Makarov ◽  
I. D. Karachentsev
Keyword(s):  
New Approach ◽  
Galaxy Groups ◽  
Closed Orbits ◽  
Crossing Time ◽  
Local Supercluster ◽  
Virial Mass ◽  
Nearby Galaxies ◽  
The Individual ◽  
Group Member ◽  
Harmonic Radius

AbstractA new approach is suggested which makes use of the individual properties of galaxies, for the identification of small galaxy groups in the Local Supercluster. The criterion is based on the assumption of closed orbits of the companions around the dominating group member within a zero velocity sphere.The criterion is applied to a sample of 6321 nearby galaxies with radial velocities V0 ≤ 3000 km s−1. These 3472 galaxies have been assigned to 839 groups that include 55% of the sample considered. For the groups identified by the new algorithm (with k ≥ 5 members) the median velocity dispersion is 86 km s−1, the median harmonic radius is 247 kpc, the median crossing time is 0.08(1/H), and the median virial-mass-to-light ratio is 56 M⊙/L⊙.

Analyzing the Effect of Fiber, Yarn and Fabric Variables on Bagging Behavior of Single Jersey Weft Knitted Fabrics

2013 ◽  
Vol 8 (3) ◽  
pp. 155892501300800 ◽  
Author(s):  
Mitra Karimian ◽  
Hossein Hasani ◽  
Saeed Ajeli
Keyword(s):  
Optimum Process ◽  
Process Conditions ◽  
Knitted Fabrics ◽  
Yarn Twist ◽  
Fabric Density ◽  
Fabric Structure ◽  
Controllable Factors ◽  
Yarn Count ◽  
The Individual ◽  
Single Jersey

This research investigates the effect of fiber, yarn and fabric variables on the bagging behavior of single jersey weft knitted fabrics interpreted in terms of bagging fatigue percentage. In order to estimate the optimum process conditions and to examine the individual effects of each controllable factor on a particular response, Taguchi's experimental design was used. The controllable factors considered in this research are blending ratio, yarn twist and count, fabric structure and fabric density. The findings show that fabric structure has the largest effect on the fabric bagging. Factor yarn twist is second and is followed by fabric density, blend ratio and yarn count. The optimum conditions to achieve the least bagging fatigue ratio were determined.

scholarly journals Modelling Polycrystalline Materials: An Overview of Three-Dimensional Grain-Scale Mechanical Models

2013 ◽  
Vol 05 (01) ◽  
pp. 1350002 ◽  
Author(s):  
I. Benedetti ◽  
F. Barbe
Keyword(s):  
Three Dimensional ◽  
Constitutive Modelling ◽  
Polycrystalline Materials ◽  
High Fidelity ◽  
Computational Capability ◽  
Mechanical Models ◽  
Three Dimensional Models ◽  
The Individual ◽  
Individual Grains ◽  
Micro Structures

A survey of recent contributions on three-dimensional grain-scale mechanical modelling of polycrystalline materials is given in this work. The analysis of material micro-structures requires the generation of reliable micro-morphologies and affordable computational meshes as well as the description of the mechanical behavior of the elementary constituents and their interactions. The polycrystalline microstructure is characterized by the topology, morphology and crystallographic orientations of the individual grains and by the grain interfaces and microstructural defects, within the bulk grains and at the inter-granular interfaces. Their analysis has been until recently restricted to two-dimensional cases, due to high computational requirements. In the last decade, however, the wider affordability of increased computational capability has promoted the development of fully three-dimensional models. In this work, different aspects involved in the grain-scale analysis of polycrystalline materials are considered. Different techniques for generating artificial micro-structures, ranging from highly idealized to experimentally based high-fidelity representations, are briefly reviewed. Structured and unstructured meshes are discussed. The main strategies for constitutive modelling of individual bulk grains and inter-granular interfaces are introduced. Some attention has also been devoted to three-dimensional multiscale approaches and some established and emerging applications have been discussed.

Synthesis of Polyurethane Dendrimers and Transfer Properties of Dye

2013 ◽  
Vol 457-458 ◽  
pp. 65-71
Author(s):  
Jing Ru Jia
Keyword(s):  
Methyl Orange ◽  
Phase Transfer ◽  
Raw Materials ◽  
Toluene Diisocyanate ◽  
Polymerization Process ◽  
Process Conditions ◽  
Addition Polymerization ◽  
Different Temperatures ◽  
The Difference ◽  
Transfer Properties

The polyfunctional organic compounds 2- hydroxymethyl -1,4- butanediol (trihydric alcohol) and toluene diisocyanate -2, 4- diisocyanate (TDI) were taken as the raw materials in this study. A polyurethane dendrimer was synthesized by utilizing the difference in the reaction activity of two isocyanate groups of TDI at different temperatures. The polymerization process conditions were studied. The addition polymerization of para-position NCO groups occurred at 50 °C, and that of ortho NCO groups occurred at 90 °C. According to the structure of the dendrimer synthesized, methyl orange was used as the guest molecule. Consequently, the aqueous methyl orange showed a phase transfer. With the increase of dendrimer concentration, the transfer rate of methyl orange increased.

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