Solid-State Transformations of Mayenite and Core-Shell Structures of C12A7@C Type at High Pressure, High Temperature Conditions.

Calcium aluminate of a mayenite structure, 12CaO∙7AlO (C12A7), is widely applicable in many fields of modern science and technology. Therefore, its behavior under various experimental conditions is of special interest. The present research aimed to estimate the possible impact of the carbon shell in core-shell materials of C12A7@C type on the proceeding of solid-state reactions of mayenite with graphite and magnesium oxide under High Pressure, High Temperature (HPHT) conditions.

The composition of the fluid phase in inclusions in synthetic HPHT diamonds grown in system Fe-Ni-Ti-C.

Diamonds grown by high pressure high temperature process (HPHT) are usually characterized by yellow color and high contents of nitrogen. Introduction of Ti decreases nitrogen content in diamond. Understanding the formation of nitrogen-poor diamond is very important not for the progress of HPHT process only, but because these diamond varieties represent the rare natural stones, although their crystallization conditions have not been clarified yet.

[THE MODERN PROSPECT FOR CITRATE MIXTURES IN THE TREATMENT OF UROLITHIASIS].

The authors present a review of literature on the use of litholytic citrate medications for conservative management of urolithiasis. Urate urolithiasis is the most common clinical condition encountered by urologists. Citrate agents, in particular Blemaren, not only may be employed in a conservative therapy of uric acid stones, but can also be successfully used in the treatment of the calcium urolithiasis, i.