Deaccelerating films for picosecond new generation dissectors

This paper describes the selection of deaccelerating films made of aluminum of various thicknesses (300–500 nm) and intended for deacceleration of electrons (with an energy of tens of kiloelectron volts to tens of electron volts) in the developed new generation picosecond dissectors. The designed dissectors should be different by a higher temporal resolution as compared to the maximum reached (~20 ps) in LI-602 dissecting image-tube converters used for diagnosing synchrotron radiation. This paper also presents the results of comparative measurements of emission characteristics of manufactured films in the models of image-tube converters similar in design to a PIF-01/S1 device, which is the basis of the developed dissectors and which provides the maximum temporal resolution of up to 1 ps in the streak mode with the streak speed of ~10¹⁰ cm/s. It is established that, when the energy of the incident electron beam equals 10 to 12 keV, the optimum thickness of the deaccelerating aluminum film is 400 nm with the effective secondary emission coefficient equal to 0.7.     

Development of yarn-guiding equipment for man-made fibre machines

Conclusions Technology has been developed for making yarn-guide equipment from the high-alumina ceramic VK 94-1. Lots of 11 types of yarn-guiding equipment have been made and tested under manufacturing conditions.Technology has been developed for obtaining a definite microgeometry of the yarn-guide equipment surface.Ceramic disks have been made for texturizing-stretching machines.Translated from Khimicheskie Volokna, No. 4, pp. 16–18, July–August, 1989.     

Sensitive solution-processed Bi2S3 nanocrystalline photodetectors

Solution-processed nanocrystal optoelectronic devices offer large-area coverage, low cost, and compatibility with a wide range of substrates. Recently, photodetectors and photovoltaics based on spin-coated nanoparticle films have shown tremendous progress in performance. However, high-performance devices reported to date have employed either Pb or Cd, raising concerns regarding environmental impact and regulatory acceptance. Herein we report a high-performance solution-processed photodetector based instead on Bi2S3 nanocrystals. The devices exhibit photoconductive gain on the order of 10 combined with temporal response on the 10 ms time scale. The resultant solution-processed Bi2S3 nanorod photoconductive photodetectors are of interest in visible and near-infrared (NIR) wavelength applications requiring video-frame-rate temporal response.     

Proteus dysbioses in patients with ulcerative colitis

In patients with ulcerative colitis Proteus could be isolated from all the gastrointestinal portions studied: mouth cavity, stomach, small intestine, small intestinal mucous membrane, and mostly from faeces. In some patients with ulcerative colitis a decrease in membraneous hydrolysis of polysaccharides was noted. Severe Proteus dysbiosis was associated with a sharp decrease in absorption processes at the small intestinal mucous membrane. The Proteus strains obtained from the patients belonged mostly to 3 serogroups: OA, OB, OC. Studies in virulent properties of Proteus in experiments with white mice gave positive results in 96% cases. Enterotoxin could be found in no case. As the result of vaccinal therapy in most patients disappearance or decrease of signs of malabsorption, increase in weight, stool normalization, and better hematological indices was manifested.     

Several indices of non-specific immunity in staphylococcal sepsis and staphylococcal gastroenterocolitis in children of different ages

A study was made of some nonspecific immunity indices in staphylococcus sepsis and gastroenterocolitis during the infectious process in young children. Results of these investigations pointed to the depression of bactericidal and lysozyme activity of the blood serum and of the immunoadherence reaction at the acute period of the disease, and to some increase at the phase of recovery. There was also found an elevation of the phagocytic activity (of the phagocytolysis percentage) at the acute phase of the staphylococcus sepsis and gastroenterocolitis Antistaphylococcus gamma-globulin produced a positive effect on the lysozyme and bactericidal activity of the blood sera and promoted an increase of the blood phagocytic activity in the sick children.     

Utilizing the resistance to microplastic deformation during aging of beryllium

Conclusions Commercial and distilled beryllium has the highest resistance to microplastic deformation after aging at 500 and 400°C, respectively. The aging of beryllium depends on the presence of iron in it.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 54–55, March, 1972.