Chemical Technological Characterization of Some Secondary Pulverous Materials Recycled in Metallurgy

2008 ◽  
Vol 59 (1) ◽  
pp. 92-96
Author(s):  
Constantin Predescu ◽  
Mirela Gabriela Sohaciu ◽  
Dana Serban ◽  
Maria Nicolae
Keyword(s):  
Chemical Composition ◽  
Point Of View ◽  
Scale Mixture ◽  
New Classification ◽  
Gas Removal ◽  
Scrap Iron ◽  
Impact Characteristics ◽  
Experimental Researches

Putting in practice the recycling projects of the damaging secondary powder products as dust, scale (mixture of oxides � fabrication defect appearing at rolling) or sand resulted in steel industry effluents removal, needs to be characterized from physical, chemical and technological point of view. This paper aims to realise a new classification of the damaging material and new definitions for their characteristics. The proposed groups are: producing characteristics, impact characteristics, removal characteristics and recycling valorisation characteristics. To underline the technological importance of the used characteristics as work instruments has been programmed experimental researches regarding the diminishing of the recycling of the dust and the sand obtained after the electric arc furnace gas removal and scale from rolling. The characteristics of recycling valorisation have been assessed: chemical composition and Zn assimilation ratio in the steel, the efficiency in liquid steel, the degree of replacing the scrap iron and the recycling chemical composition.

Reductionism and holism in the philosophy of medicine

2020 ◽  
pp. 66-74
Author(s):  
E. Zakablukovskiy
Keyword(s):  
Philosophy Of Medicine ◽  
Point Of View ◽  
Social Model ◽  
Macro Level ◽  
New Classification

The article highlights certain aspects of the discussion on the topic of reductionism vs. holism in the philosophy of medicine. Classic radical reductionism is defeated by the concept of emergence. The s.c. bio-medical point of view on a malady, despite its relevance and clear benefit, is not recognized as universal as its adherents may claim, and it yields to an integral psycho-bio-social model. The author introduces a new classification of holism (vitalistic, social and individualistic) and makes appropriate recommendations to clinicians. It is social holism at the macro level that has proven effective in combating the spread of COVID-19.

On the Dynamic Isotropy of Mechanisms With Two Degrees of Freedom

2005 ◽  
Author(s):  
Raffaele Di Gregorio ◽  
Alessandro Cammarata ◽  
Rosario Sinatra
Keyword(s):  
Finite Number ◽  
Degrees Of Freedom ◽  
Point Of View ◽  
Closed Curves ◽  
Special Cases ◽  
Dynamic Performances ◽  
Definition Of ◽  
Geometric Locus

The comparison of mechanisms with different topology or with different geometry, but with the same topology, is a necessary operation during the design of a machine sized for a given task. Therefore, tools that evaluate the dynamic performances of a mechanism are welcomed. This paper deals with the dynamic isotropy of 2-dof mechanisms starting from the definition introduced in a previous paper. In particular, starting from the condition that identifies the dynamically isotropic configurations, it shows that, provided some special cases are not considered, 2-dof mechanisms have at most a finite number of isotropic configurations. Moreover, it shows that, provided the dynamically isotropic configurations are excluded, the geometric locus of the configuration space that collects the points associated to configurations with the same dynamic isotropy is constituted by closed curves. This results will allow the classification of 2-dof mechanisms from the dynamic-isotropy point of view, and the definition of some methodologies for the characterization of the dynamic isotropy of these mechanisms. Finally, examples of applications of the obtained results will be given.

scholarly journals Cellular Plasticity and Tumor Microenvironment in Gliomas: The Struggle to Hit a Moving Target

Cancers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1622 ◽  
Author(s):  
Ricardo Gargini ◽  
Berta Segura-Collar ◽  
Pilar Sánchez-Gómez
Keyword(s):  
Tumor Cells ◽  
Point Of View ◽  
Complete Surgical Resection ◽  
Current Therapies ◽  
The Subject ◽  
Traditional Therapies ◽  
New Treatments ◽  
Classification Of Gliomas

Brain tumors encompass a diverse group of neoplasias arising from different cell lineages. Tumors of glial origin have been the subject of intense research because of their rapid and fatal progression. From a clinical point of view, complete surgical resection of gliomas is highly difficult. Moreover, the remaining tumor cells are resistant to traditional therapies such as radio- or chemotherapy and tumors always recur. Here we have revised the new genetic and epigenetic classification of gliomas and the description of the different transcriptional subtypes. In order to understand the progression of the different gliomas we have focused on the interaction of the plastic tumor cells with their vasculature-rich microenvironment and with their distinct immune system. We believe that a comprehensive characterization of the glioma microenvironment will shed some light into why these tumors behave differently from other cancers. Furthermore, a novel classification of gliomas that could integrate the genetic background and the cellular ecosystems could have profound implications in the efficiency of current therapies as well as in the development of new treatments.

scholarly journals Investigations of quartz raw materials from the locality of Rekovac muncipality

2019 ◽  
Vol 73 (4) ◽  
pp. 265-274
Author(s):  
Slavica Mihajlovic ◽  
Zivko Sekulic ◽  
Jovica Stojanovic ◽  
Vladan Kasic ◽  
Iroslav Sokic ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Physical Properties ◽  
Quartz Sand ◽  
Raw Materials ◽  
Construction Materials ◽  
Size Fraction ◽  
Point Of View ◽  
Raw Material ◽  
Potential Applications

Quality of raw materials, including quartz sand and quartzite, varies from one deposit to another. Furthermore, the material quality determines in which industrial branches it can be used after certain preparation processes. Potential applications of quartz raw materials are: in the construction and refractory industry, ceramics and glass industry, then in metallurgy, foundry and also in production of water treatment filters. Geological investigations of the central Serbia region, in the Rekovac municipality, resulted in identification of occurrence of quartz sand ("Ursula") and quartzite ("Velika Krusevica"). Preliminary laboratory tests and characterization of the quartz sand size fraction -0.63+0.1 mm confirmed the possibility of applying this size fraction in the construction materials industry, while the quartzite can be used in refractory, glass and metallurgy industries. After determining the geological reserve of quartz sand "Ursula" and quartzite "Velika Krusevica", detailed investigations are required. Quality conditions from the aspect of chemical composition and physical properties of quartz sand and quartzite are mostly clearly defined by a special standard for this purpose. On the other hand, there are also application areas where standards does not exist, but users define their quality conditions. This example is with the application of quartz sand in the production of water glass. Chemical composition as well is not always the determining factor for the application of quartz raw material. For example, for quartz sand used for sandblasting, grain form is essential. From the economic analysis point of view, the prices of quartz raw materials vary depending on their chemical and physical properties. After all, what needs to be pointed out is the fact that these raw materials are very widespread in nature and that their exploitation is quite simple. After the raw material is excavated, it is stored and further sieved, washed, dried and processed according to customer requirements. All of these processes are cheaper than preparing, for example, limestone, and significaly cheaper than preparation of metal ores.

A New Fuzzy Geometrical Approach to Classify Defects in Composite Materials

2012 ◽  
Vol 2 (4) ◽  
pp. 12-20
Author(s):  
Matteo Cacciola ◽  
Salvatore Calcagno ◽  
Fabio La Foresta ◽  
Mario Versaci
Keyword(s):  
Point Of View ◽  
Geometrical Approach ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Fuzzy Distance ◽  
Reinforced Polymer ◽  
Heuristic Technique ◽  
Non Destructive

It is well known that in the Non Destructive Testing/Evaluation (NDT/E) context, Ultrasonic Echoes (UEs) and Tests (UTs) are intensively exploited to identify and characterize defects in the Carbon Fiber Reinforced Polymer (CFRP). This paper examines the localization and the classification of defects in this material from a fuzzy geometrical point of view. In particular, starting from an experimental campaign of measurements carried out in our Lab (Laboratory of Electrical Engineering & Non-Destructive Tests and Evaluations, “Mediterranea” University of Reggio Calabria), fuzzy subsethood calculus is taken into account to translate the characterization of a defect in CFRP into a sort of “fuzzy distance” among UEs. Finally, the floor is open for any questions related to the comparison with a higher computational complexity heuristic technique.

scholarly journals Photometric Classification of Stars in the Vilnius Observatory

1973 ◽  
Vol 50 ◽  
pp. 183-185 ◽  
Author(s):  
V. Straižys
Keyword(s):  
Spatial Distribution ◽  
Chemical Composition ◽  
Stellar Evolution ◽  
Three Dimensional ◽  
Point Of View ◽  
Photometric System ◽  
Intermediate Band ◽  
Dimensional Classification

The programs of three-dimensional classification of stars using eight-color intermediate band photometric system are described. They include (1) investigation of interstellar reddening and absorption in the direction of objects significant from point of view of stellar evolution, (2) investigation of spatial distribution of stars of different spectral classes, luminosities and chemical composition, (3) the detection of unique objects.

Microstructure Characterization of Superfine WC-Co Powders

2013 ◽  
Vol 203-204 ◽  
pp. 351-354 ◽  
Author(s):  
Grzegorz Moskal ◽  
Krzysztof Szymański ◽  
Agnieszka Tomaszewska ◽  
Hanna Myalska
Keyword(s):  
Phase Composition ◽  
Chemical Composition ◽  
Thermal Spraying ◽  
Point Of View ◽  
Microstructural Properties ◽  
Technological Properties ◽  
Composite Powders ◽  
Distribution Maps ◽  
Macro Scale

In this paper results of tests concerning the WC/Co fine-crystalline composite powders type 88/12 and 83/17 provided for thermal spraying of layers resistant to abrasion are presented. Tests which characterize basic technological properties were performed since these properties are essential from thermal spraying point of view. Microstructural properties are essential as well because they allow evaluation of morphology of powders by SEM method with an analysis of chemical composition in micro-areas. Moreover, the phase composition was characterized by XRD in macro scale and by EBSD in microareas including distribution maps of individual phase components in all particles of the powders.

scholarly journals Czasownikowe formanty modyfikacyjne w języku polskim

2015 ◽  
Vol 45 ◽  
pp. 81-97 ◽  
Author(s):  
Jadwiga Stawnicka
Keyword(s):  
Point Of View ◽  
Research Project ◽  
Varied Degree ◽  
Quantitative Characteristics

Verbal modificational formatives in PolishThe paper presents the classification of verbal derivatives according to Aktionsart in Polish (Verbs containing modificational formatives). In the first part of this paper the main aim is to describe a research project about the semantic-derivational category of Aktionsarten in Slavonic languages. The second part of this paper focuses on the characterization of Polish types of verbal action. The term «types of verbal action» subsumes semantic-derivational classes of verbs distinguished on the basis of modifications in the meanings of verb bases, from the point of view of quantitative characteristics. These derivatives represent the following Aktionsarten: temporal, Aktionsarten with the varied degree of intensity and iterative Aktionsarten. Within the scope of particular Aktiosarten the division of derivatives into semantic groups according to the subtypes of Aktionsarten are formal ways of expressing them has been carried out. The article points at the problem of explaining the various meaning of Aktionsarten.

Genus-level taxonomical changes in the Lepanthes affinity (Orchidaceae, Pleurothallidinae)

Phytotaxa ◽  
2018 ◽  
Vol 340 (2) ◽  
pp. 128 ◽  
Author(s):  
DIEGO BOGARÍN ◽  
ADAM P. KARREMANS ◽  
MELANIA FERNÁNDEZ
Keyword(s):  
Phylogenetic Inference ◽  
Morphological Characterization ◽  
New Classification ◽  
Follow Up Study ◽  
Genus Level

We propose a new classification of the Lepanthes affinity based on previous studies and our ongoing phylogenetic re-evaluation of the Pleurothallidinae. Fourteen genera are recognized as belonging to the affinity. They are found highly supported in a DNA-based phylogenetic inference of combined plastid (matK) and nuclear (nrITS) datasets. The necessary changes, including four novel generic concepts, needed to reorganize the Lepanthes affinity, are proposed here to insure monophyly. The integral discussion on the phylogenetics and biogeography of the group, together with morphological characterization of each clade will be presented in a follow up study.

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