Belarusian State Technological University (Russian: Белорусский государственный технологический университет; Belarusian: Беларускі Дзяржаўны Тэхналагічны Універсітэт) is a university in Minsk, Belarus specialized in engineering and technology. It was established in Gomel in 1930 as the Forestry Institute. In 1941, it was evacuated to Sverdlovsk, now Yekaterinburg. Returned to Gomel in 1944, but in 1946 relocated to Minsk as the Belarusian Institute of Technology.
A study of reagent-free electrolysis purification of recirculating water supply systems for industrial aquaculture (growing catfish) was conducted. The aim was to study the efficiency of nitrogen-containing compounds (NH4⁺, NO2⁻, NO3⁻) reduction using generators with linear and pulse waveforms. The electrochemical unit operated at a current of 30 A and a voltage of 22 V, ensuring the processing of up to 20 m3 of water per day. The results showed that the use of a pulse power source ensures up to 40
The study investigated the influence of soft (λ = 0.154 nm) and hard (λ = 0.02 nm) X-ray radiation on the microstructure and mechanical properties of a fluoropolymer composite. The object of research for studying radiation interaction with fluoropolymer composites was the fluoropolymer material with carbon nanofibers “Superfluvis,” developed at the V.A. Bely Institute of Mechanics of Metal-Polymer Systems (Republic of Belarus). This material is widely used in automotive and mechanical engineering for creating structures capable of withstanding extreme loads. It was found that irradiation of the composite fluoropolymer material for 60 min leads to a 25
A detailed investigation of WE43 for biodegradable implants with halloysite nanotubes filled with an aliphatic sulfur-containing alpha-amino acid was conducted. The phosphating created a compact crystalline coating, brushite (CaHPO4 center dot 2H2O) with Ca ti 46 wt %, P ti 22 wt%, O ti 32 wt%. The activated halloysite nanotubes (HNTs) encapsulated with L-methionine demonstrated a large increase in surface charge (-66.34 +/- 0.2 mV). WE43 was cytotoxic at a high concentration range (500-1000 mu g center dot mL-1) and a much lower concentration range (125-250 mu g center dot mL-1) after 48 h and 72 h, respectively, with moderate inhibition or minimal inhibition. Pure HNTs displayed no cytotoxicity, and the methionine-loaded HNTs demonstrated time-dependent cytotoxicity on the Fl cells. The electrochemical studies performed in Hank's solution (pH 7.4) found that uncoated WE43 had a corrosion current density of 1.66 center dot 10-5 A center dot cm-2. Calcium phosphate (CaP) conversion coating had a corrosion current density of 3.13 center dot 10-6 A center dot cm-2, which was a 5.25 times reduction. Coating: bringing the corrosion current density down to 2.59 center dot 10-6 A center dot cm-2, providing ti 12 % more protection. HNTs, built into the PLA matrix, provide additional protection of 4 %. L-methionine encapsulation in HNTs reduced the corrosion current by 2 times (2.77 center dot 10-7 A center dot cm-2) as the inhibitor was released during the process of polymer degradation.
The aim of this work is to synthesize nanostructured luminescent powders of yttrium oxide doped with terbium ions. Y2О3:Tb3+ powders were obtained by thermochemical synthesis (combustion). The sources for the synthesis were nitric acid salts of yttrium and terbium. Organic acids, citric acid and acetic acid, were used as reducing agents and combustible components. It has been established that large porous aggregates with sizes up to 200 microns are formed with citric acid during combustion, and nanostructured finely dispersed powders consisting of nanocrystalline particles with sizes of 39±5 nm are formed with acetic acid. Examination of morphological and structural characteristics using scanning electron microscopy techniques and X-ray diffraction analysis showed that the heat treatment of the powders at 900°C and 1100°C for 2 hours increased the crystallinity degree of Y2O3:Tb3+ powder particles and increased their size to 110±10 and 170±10 nm, accordingly. It was found that the obtained powders exhibit luminescence in the visible region of the spectrum centered at 560 nm (green radiation) when excited at a wavelength of 304 nm, and the radiation intensity increases with increasing calcination temperature. The resulting nanostructured Y2О3:Tb3+ powders are promising as effective green light luminophores for a number of optical applications, in particular in LED devices, as well as for being added into paper and polymer materials in security screen printing systems.
В настоящее время к жидким кристаллам принято относить вещества, которые способны об разовывать мезофазу. Для мезофазы (жидкокристаллического состояния) характерны жидкое агрегатное состояние и одновременная упорядоченность молекулярной структуры, что присуще твердым кристаллическим веществам. В результате для веществ, находящихся в жидкокристаллическом состоянии, наблюдается анизотропия некоторых свойств. Такое уникальное сочетание свойств жидкостей и кристаллов позволяет использовать их в электронике, технике и медицине. Поэтому получение и изучение характеристик новых веществ, способных образовывать мезофазы, является актуальной задачей для научных исследований. Способность образовывать мезофазы обнаружена для разных классов соединений. Наибольший интерес для практического применения представляют полициклические органические соединения, переходящие в мезофазу при нагревании. Такие жидкие кристаллы называют термотропными. Их используют при изготовлении различных дисплеев и индикаторов. Характерной особенностью большинства термотропных жидких кристаллов является анизотропия формы молекул. Чаще всего молекулы этих веществ имеют вытянутую стержнеобразную форму. Для получения новых жидкокристаллических веществ широко используют синтетические схемы, которые включают химическую модификацию мезогенных структурных блоков.
