Elucidation of block boundaries as the dissolution channels in hydrated cement

1978 ◽  
Vol 36 (1) ◽  
pp. 484-485
Author(s):  
N.V. Belov ◽  
U.I. Papiashwili ◽  
B.E. Yudovich
Keyword(s):  
Liquid Phase ◽  
Grain Boundaries ◽  
Benzoyl Peroxide ◽  
Phase Contrast ◽  
Active Role ◽  
Point Of View ◽  
Hardened Cement ◽  
Hydrated Cement ◽  
Hardened Cement Paste

It has been almost universally adopted that dissolution of solids proceeds with development of uniform, continuous frontiers of reaction.However this point of view is doubtful / 1 /. E.g. we have proved the active role of the block (grain) boundaries in the main phases of cement, these boundaries being the areas of hydrate phases' nucleation / 2 /. It has brought to the supposition that the dissolution frontier of cement particles in water is discrete. It seems also probable that the dissolution proceeds through the channels, which serve both for the liquid phase movement and for the drainage of the incongruant solution products. These channels can be appeared along the block boundaries.In order to demonsrate it, we have offered the method of phase-contrast impregnation of the hardened cement paste with the solution of methyl metacrylahe and benzoyl peroxide. The viscosity of this solution is equal to that of water.

Role of the solid/liquid interface faceting in rapid penetration of a liquid phase along grain boundaries

2001 ◽  
Vol 49 (7) ◽  
pp. 1123-1128 ◽  
Author(s):  
D. Chatain ◽  
E. Rabkin ◽  
J. Derenne ◽  
J. Bernardini
Keyword(s):  
Liquid Phase ◽  
Grain Boundaries ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid

scholarly journals Is it possible to see darkness? Goethe and Aristotle on the role of light and darkness in vision

2019 ◽  
Vol 13 (2) ◽  
pp. 537-553
Author(s):  
Svetlana Mesyats
Keyword(s):  
Active Role ◽  
Point Of View ◽  
Color Theory ◽  
Basic Rule ◽  
Transparent Medium ◽  
Role Of Light

J.W. Goethe in his Farbenlehre deduced all physical colors from a simple primordial phenomenon that takes place every time light and darkness act through a semi-transparent colorless medium either on our eyes or on the opposite surfaces. This basic rule of Goethe’s color theory was criticized by his contemporary physicists, who argued that darkness could not play an active role in the origin of colors because of being a mere absence of light. The paper demonstrates that this criticism became possible only if one shares the Newtonian view on the nature of light and darkness. Goethe however held a more traditional point of view, which he traced back to Antiquity and Aristotle. In contrast to Newton and his followers, previous scientists considered light not as an immediate cause of colors but as an actually transparent medium that conveyed colors from the visible objects to the organ of sight. For vision to take place, the color must first affect the light, which in its turn, must affect the faculty of vision. Though it is difficult to say what kind of change the light undergoes when some colored object is seen through it, most Aristotle commentators agree that this change must be real and not mere relational. In Aristotle’s physics, however, things that are capable of acting on and being affected by one another are either contraries or consist of contraries. Therefore, to be visible the color must be either dark or to contain darkness. Thus, assuming that Goethe shared the Aristotelian concept of light, we have to conclude that he was not mistaken saying that darkness "acts” upon our eyes or “is seen through” the illuminated semi-transparent medium.

scholarly journals Customers’ expectations from savings products

VUZF Review ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 4-10
Author(s):  
Stanislav Dimitrov
Keyword(s):  
Interest Rates ◽  
Active Role ◽  
Point Of View ◽  
Ageing Population ◽  
Low Interest Rates ◽  
Cost Efficient ◽  
Changing Attitudes ◽  
Further Development

Customers expect certain characteristics from long-term savings products. Providers are not able to supply all of these characteristics in one product at the same time. In addition, there are changing attitudes of the savers and the requirements to the financial institutions are evolving. The paper is analyzing the customers’ expectations from the long-term savings products. The manuscript is searching answer which are the most important characteristics of the savings products from the point of view of the client. The research is focused on three main areas: which are the customers’ expectations; what is the current environment in the market of savings products and what developments can we expect in the coming years. One of the conclusions is that the providers have to adapt their products to the customers’ expectations in order to succeed and to reach further development of the markets. Another conclusion is that customer centric products will gain greater trust among potential savers. We believe that the successful saving product has to be simple, transparent and cost-efficient. This reflects the surrounding environment of low interest rates, ageing population, increased informational flow, digitalization and alternative products development. To support the savers and the providers it is needed public help, targeting good coverage and constant efforts for active role of the stakeholders in the savings process.

The Study of Grain Boundaries in Ag-Sheathed Bscco Tapes by Scanning Transmission Electron Microscopy

1999 ◽  
Vol 5 (S2) ◽  
pp. 796-797
Author(s):  
K. Kishida ◽  
Y. Pan ◽  
N.D. Browning
Keyword(s):  
Grain Boundaries ◽  
Critical Current ◽  
Large Scale ◽  
Underlying Mechanism ◽  
Point Of View ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Current Densities ◽  
Commercial Applications

Highly textured (Bi,Pb)2Sr2Ca2Cu3O10(Bi-2223)/Ag composite tapes have received considerable attention as high-Tc superconducting materials for electric power and high-magnetic-field applications because of their relatively high-critical current densities and their flexibility. In order to improve the performance of these tapes for many commercial applications, it is essential that the mechanisms that limit the critical current density are fully understood. Previous microscopical studies of these tapes have revealed that interfaces such as grain boundaries strongly influence the transport of large currents1. From a morphological point of view, several models have been proposed to describe potential current transport mechanisms. However, as these models consider mainly the large-scale configuration of the boundaries, the underlying mechanism controlling the properties is still unclear. In order to elucidate the exact role of grain boundaries, systematical studies on the effect of the atomic structure as well as any chemistry change that occurs at the interface are required.

scholarly journals A Contrastive Analysis of English and Turkish Plural Markers

2016 ◽  
Vol 6 (4) ◽  
pp. 112
Author(s):  
Engin Evrim Önem
Keyword(s):  
Active Role ◽  
Point Of View ◽  
Contrastive Analysis ◽  
Distinctive Features

<p>This morphophonemic study aims to analyze pluralization processes for common nouns in English and native Turkish. To achieve this, a contrastive analysis focusing on English and Turkish plural markers from a structuralist point of view is taken. The results of the analysis reveal the differences and similarities between two languages in terms of plural markers. As for the differences, it is found that English and Turkish differ in regular and irregular plural forms as well as active role of consonants and vowels for pluralization process. Similarities for plural markers include focusing on the final sound of nouns, relying on distinctive features of sounds, employing allomorphs and using plural markers as suffixes for both languages to a varying degree. The findings of this study might help learners of English and Turkish by revealing the differences and similarities in both languages.</p>

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