Study of the Composition of a Precipitate Formed from Solutions for the Synthesis of Cathodic Materials Containing Manganese and Citric Acid

Theoretical Foundations of Chemical Engineering - Cathode materials of lithium-ion batteries can be efficiently and quickly obtained by solution combustion synthesis (SCS) from nitrate solutions of...     

New Octopus-like Phthalocyanines as Fullerene Receptors: Synthesis and Photophysical Investigation

Octopus-like zinc and magnesium phthalocyaninates bearing eight flexible benzylated diethylene glycol chains were synthesized and their interaction with fullerenes C₆₀ and C₇₀ was investigated by UV-Vis spectrophotometric titration, as well as by steady-state and time-resolved fluorescence spectroscopy in chloroform and toluene media. These measurements revealed a high affinity of receptors for C₆₀ and C₇₀, with selectivity to C₇₀: binding constants for C₇₀ are almost two times higher than for C₆₀. These results are interpreted by means of quantum-chemical calculations using the PM6-DH2 Hamiltonian. The binding constants also depend on both the nature of the metal ion in the receptor and the solvent. It is expected that the obtained molecules and supramolecular complexes can be used for further elaboration of optoelectronic donor-acceptor materials.     

Hybrid laminated materials with slow fatigue-crack development

The use of light aluminum–lithium alloys with high elastic moduli in hybrid laminated materials for the production of skin panels in airplane wings is considered.     

Potentialities of present day computed tomography in diagnosis of stomach cancer

Based on the findings of 206 examinations, the authors advance their opinion of the role of X-ray computed tomography (XRCT) in the diagnosis of gastric cancer. The authors think that if their developed procedure for X-ray computed tomography based on the use of usual air as the only contrast agent by measuring it out in doses and administering into the gastric at CT scanning, which is called pneumoroentgenocomputered tomography (PRCT), is employed, it, preserving all the traditional, already known, advances of XRCT additionally yields highly valuable information on a direct damage to the gastric wall itself. The findings suggest that PRCT is especially effective in intramurally growing gastric cancers, the so-called squamous carcinomas, which are hardly differentiated for diagnosis and which are most common. Noteworthy is the fact that in seemingly unquestionable exophytic gastric cancer, detecting intramural tumorous infiltration adjacent to the exophyte, PRCT thus provides evidence that the exophyte revealed is the peculiar top of an iceberg, whose base shows a significant exophytic gastric carcinoma.     

Effect of the exposure time between hardening and tempering on the structure and mechanical properties of an Al-Mg-Zn alloy

Under production conditions articles are not placed in the furnace for aging immediately after hardening. The duration of exposure at room temperature between hardening and tempering has a considerable effect on the properties of aluminum alloys.All-Union Institute of Aviation Materials, Moscow. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 22–24, January, 1994.