scholarly journals Some features of the formation of the oxidation zone of the Kokpatas ore field in Uzbekistan

2021 ◽  
Vol 937 (4) ◽  
pp. 042083
Author(s):  
T Ishbobaev ◽  
A Tangirov ◽  
A Khalilov ◽  
M Muratova
Keyword(s):  
Native Gold ◽  
Oxidation Zone ◽  
Oxidation Products ◽  
Research Results ◽  
Size Classes

Abstract Our article discusses the materials obtained by the authors in the study of the oxidation zone and primary ores of various deposits of the Kokpatassky ore field. The obtained research results confirm that the predominant part of gold remains in minerals replacing sulfides (pyrite, arsenopyrite) with the preservation of gold and its characteristic satellites in the oxidation products of sulfides (hedrogoethite, goethite and scorodite). Native gold belongs to fine and small size classes. The main concentrators of native gold are quartz, carbonate and oxidized forms of sulfides. Often, together with gold, arsenopyrite, scorodite, tetrahedrite, acanthite, electrums are noted.

VITALITY STATE OF THE SPECIAL ONOBRYCHIS MAJOROVII GROSSH. IN THE RESERVED SARICUM (DAGESTAN) COENOPOPULATION

2020 ◽  
Vol 6 (2) ◽  
pp. 27-33
Author(s):  
Z.M. Akhmedova ◽  
◽  
A.I. Adzhieva ◽  
Keyword(s):  
Growth And Development ◽  
The State ◽  
Anthropogenic Stress ◽  
Research Results ◽  
Size Classes ◽  
Natural Factors ◽  
Wide Range ◽  
Very High

This article is devoted to the study of Onobrychis majorovii coenopopulation located in reserve Saricum. For coenopopulation study was used the method of Yu. A. Zlobin. In research morphometric and allometric parameters were considered. Studies have allowed to get some idea not only about the features of the vitality spectrum of individuals, but also about the conditions for the implementation of processes of their growth and development. As the research results showed, the characteristics taken for accounting are characterized by a wide range of variability from medium to very high. When distributing individuals by size classes, for most characters, a predominance of individuals in the medium-sized class was noted, although the prevalence of a small-sized class of individuals was recorded for five characters, which raises some concerns about the state of the studied coenopopulation. In general, by all indications, the mediumsized class prevails and the prosperous nature of life processes in individuals of the studied coenopopulation is calculated. However, the degree of prosperity of the studied coenopopulation is extremely low, which suggests that the conditions for the existence of coenopopulation are far from optimal. Based on previous studies and the discovery of the regressive nature of life processes in individuals of the studied species in the Saricum coenopopulation, we can conclude that it is unstable. This may be a consequence of exposure to extreme natural factors and / or the influence of anthropogenic stress.

scholarly journals Mustard Gold of the Gaching Ore Deposit (Maletoyvayam Ore Field, Kamchatka, Russia)

Minerals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 489 ◽  
Author(s):  
Tolstykh ◽  
Palyanova ◽  
Bobrova ◽  
Sidorov
Keyword(s):  
Native Gold ◽  
Kamchatka Peninsula ◽  
Oxidation Products ◽  
Ore Deposit ◽  
Gold Particles ◽  
Sequential Transformation ◽  
Transformation Stage ◽  
The Impact ◽  
Volcanic Belts ◽  
Fine Gold

The Gaching high-sulfidation (HS) epithermal Au–Ag deposits, part of the Maletoyvayam ore field, which is located in the volcanic belts of the Kamchatka Peninsula (Russia). The main ore components are native gold, tellurides, selenides, and sulphoselenotellurides of Au and oxidation products of Au-tellurides. This study examines the different types of native gold in this ore deposit and the mechanisms and sequential transformation of calaverite (AuTe2) into mustard gold. The primary high fineness gold (964‰–978‰) intergrown with maletoyvayamite Au3Te6Se4 and other unnamed phases (AuSe, Au(Te,Se)) differ from the secondary (mustard) gold in terms of fineness (1000‰) and texture. Primary gold is homogeneous, whereas mustard is spongy. Two types of mustard gold were identified: a) Mixtures of Fe-Sb(Te,Se,S) oxides and fine gold particles, which formed during the hypogenic transformation stage of calaverite due to the impact of hydrothermal fluids, and b) spotted and colloform gold consisting of aggregates of gold particles in a goethite/hydrogoethite matrix. This formed during the hypergenic transformation stage. Selenides and sulphoselenotellurides of gold did not undergo oxidation. Pseudomorphic replacement of calaverite by Au-Sb(Te,Se,S,As) oxides was also observed.

scholarly journals Oxidation Behavior of Inconel 740H Nickel Superalloy in Steam Atmosphere at 750 °C

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4536
Author(s):  
Barbara Kościelniak ◽  
Bartosz Chmiela ◽  
Maria Sozańska ◽  
Radosław Swadźba ◽  
Marcin Drajewicz
Keyword(s):  
Electron Microscope ◽  
Internal Oxidation ◽  
Transmission Electron Microscope ◽  
Oxidation Behavior ◽  
Nickel Superalloy ◽  
Oxidation Zone ◽  
Oxidation Products ◽  
Internal Oxidation Zone ◽  
Transmission Electron ◽  
Α Al2o3

The oxidation behavior of the nickel superalloy Inconel 740H was studied at 750 °C for 100, 250, 500, 1000, and 2000 h in a steam atmosphere. Microstructure observations were performed using scanning electron microscopes and scanning-transmission electron microscope. The phase identification of existing oxidation products was conducted by electron diffraction in transmission electron microscope. The obtained results showed that the microstructure of Inconel 740H was stable during the oxidation process. The kinetic data showed that the superalloy has the ability to form protective oxide layers that are characterized by good adhesion and no tendency to spallation during the test. The oxidation products were mainly composed of external and internal oxides mainly at grain boundaries. The oxides in the external layer were Cr2O3, MnTiO3,, and α-Al2O3 after 2000 h of oxidation. Internal oxides were α-Al2O3 and TiO2. The occurrence of discontinuities in the internal oxidation zone was also observed after 500 h of test. It was found that the thickness of the internal oxidation zone was greater than the thickness of the external oxide layer, which proves the strong tendency of the superalloy to form internal oxides after oxidation in the steam atmosphere.

Contributions to the mechanisms of mitosis and roles of cytoplasmic microtubules from ultrastructural analyses of fungi

1978 ◽  
Vol 36 (2) ◽  
pp. 266-267
Author(s):  
I. Brent Heath
Keyword(s):  
Nuclear Envelope ◽  
Direct Application ◽  
Ultrastructural Analysis ◽  
General Interest ◽  
Research Results ◽  
Organelle Motility ◽  
Cytoplasmic Microtubules

Detailed ultrastructural analysis of fungal mitotic systems and cytoplasmic microtubules might be expected to contribute to a number of areas of general interest in addition to the direct application to the organisms of study. These areas include possibly fundamental general mechanisms of mitosis; evolution of mitosis; phylogeny of organisms; mechanisms of organelle motility and positioning; characterization of cellular aspects of microtubule properties and polymerization control features. This communication is intended to outline our current research results relating to selected parts of the above questions.Mitosis in the oomycetes Saprolegnia and Thraustotheca has been described previously. These papers described simple kinetochores and showed that the kineto- chores could probably be used as markers for the poorly defined chromosomes. Kineto- chore counts from serially sectioned prophase mitotic nuclei show that kinetochore replication precedes centriole replication to yield a single hemispherical array containing approximately the 4 n number of kinetochore microtubules diverging from the centriole associated "pocket" region of the nuclear envelope (Fig. 1).

Grammatical Morpheme Intervention Issues for Students Who Use AAC

2008 ◽  
Vol 17 (2) ◽  
pp. 62-68 ◽  
Author(s):  
Cathy Binger
Keyword(s):  
Special Interest ◽  
Augmentative And Alternative Communication ◽  
Intervention Program ◽  
Annual Conference ◽  
Alternative Communication ◽  
Research Results ◽  
School Aged Children ◽  
Grammar Acquisition ◽  
Device Use

Abstract Many children who use AAC experience difficulties with acquiring grammar. At the 9th Annual Conference of ASHA's Special Interest Division 12, Augmentative and Alternative Communication, Binger presented recent research results from an intervention program designed to facilitate the bound morpheme acquisition of three school-aged children who used augmentative and alternative communication (AAC). Results indicated that the children quickly began to use the bound morphemes that were taught; however, the morphemes were not maintained until a contrastive approach to intervention was introduced. After the research results were presented, the conference participants discussed a wide variety of issues relating to grammar acquisition for children who use AAC. Some of the main topics of discussion included the following: provision of supports for grammar comprehension and expression, intervention techniques to support grammatical morpheme acquisition, and issues relating to AAC device use when teaching grammatical morpheme use.

Children's Performance on a Binaural Fusion Task

1981 ◽  
Vol 24 (4) ◽  
pp. 520-525 ◽  
Author(s):  
Bruce L. Plakke ◽  
Daniel J. Orchik ◽  
Daniel S. Beasley
Keyword(s):  
Enhancement Effect ◽  
Sensation Level ◽  
Large Measure ◽  
Filter Bandwidth ◽  
Research Results ◽  
Presentation Modes ◽  
Monosyllabic Words ◽  
Better Than

Binaural auditory fusion of 108 children (4, 6, and 8 years old) was studied using three lists of monosyllabic words (WIPI) presented at two sensation levels (30 and 40 dB). The words were processed to produce three bandwidth conditions (100, 300, 600 Hz) and were administered via three presentation modes (binaural fusion 1, diotic, binaural fusion 2). Results showed improved discrimination scores with increasing age, sensation level, and filter bandwidth. Diotic scores were better than binaural fusion scores for the narrower bandwidth conditions, but the diotic enhancement effect was seriously compromised in the widest bandwidth (600 Hz) condition. The results confirmed the contention that prior research results were equivocal due, in large measure, to procedural variability. Methods for reducing such variability and enhancing the clinical viability of binaural fusion tasks are suggested.

Projecting a European Diploma in Psychology

2002 ◽  
Vol 7 (3) ◽  
pp. 221-224 ◽  
Author(s):  
Bernhard Wilpert
Keyword(s):  
Research Process ◽  
Project Team ◽  
Future Research ◽  
Research Results ◽  
External Constraints ◽  
Internal Procedures ◽  
The Eu

The paper presents an inside evaluation of the EuroPsyT project, funded by the EU Leonardo Program in 1999-2001. While standard research usually neglects to reflect on the internal and external constraints and opportunities under which research results are achieved, the paper stresses exactly those aspects: starting from a brief description of the overall objectives of the 11 countries project, the paper proceeds to describe the macro-context and the internal strengths and weaknesses of the project team, the internal procedures of cooperation,. and obstacles encountered during the research process. It winds up in noting some of the project's achievements and with a look towards future research.

The Structure of Wiggins' Interpersonal Circumplex: Cross-Cultural Studies

1999 ◽  
Vol 15 (3) ◽  
pp. 196-205 ◽  
Author(s):  
Rosario Martínez-Arias ◽  
Fernando Silva ◽  
Ma Teresa Díaz-Hidalgo ◽  
Generós Ortet ◽  
Micaela Moro
Keyword(s):  
Cultural Studies ◽  
Cross Cultural ◽  
The Other ◽  
Spanish Version ◽  
Interpersonal Circumplex ◽  
Research Groups ◽  
Independent Research ◽  
Research Results ◽  
Cross Cultural Studies

Summary: This paper presents the results obtained in Spain with The Interpersonal Adjective Scales of J.S. Wiggins (1995) concerning the variables' structure. There are two Spanish versions of IAS, developed by two independent research groups who were not aware of each other's work. One of these versions was published as an assessment test in 1996. Results from the other group have remained unpublished to date. The set of results presented here compares three sources of data: the original American manual (from Wiggins and collaborators), the Spanish manual (already published), and the new IAS (our own research). Results can be considered satisfactory since, broadly speaking, the inner structure of the original instrument is well replicated in the Spanish version.

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