Abstracts
The article discusses the features of the stands with a reusable diaphragm use in technology development for engineering industrial companies (EIC). The main advantages of this solution are ...highlighted, as well as a comparison with the existing analogues. It is shown that the use of stands with a reusable diaphragm significantly increases the competence level, organizational and technological resources of the EIC, employed in the production of composite materials.
The use of composite materials in all industries has a negative impact on the environment in general and man in particular. Polymeric binders include hazardous substances, and the auxiliary ...components used in production are made of non-processed materials. It is possible to reduce the negative impact on the environment by using a new technology using reusable flexible punches.
Abstracts
Today, the main tool for the development of any technical product made of traditional materials (metals for example) is computer-aided design (CAD) systems. CAD means a wide range of ...solutions that allow you to solve almost all design problems, from creating drawings to logistics. However, the engineering software visualization methods have not undergone major changes over the past decades and do not take into account the composite materials feature, and to improve the development process, it is rational to apply virtual reality technologies.
The textural characteristics of carbon nanomaterials and their adsorption capacity with respect to nonferrous metal ions have been studied. A comparative study of the applicability of adsorption ...models for describing adsorption isotherms for Cu
2+
and Zn
2+
ions has been carried out. The results on the electroflotation extraction of carbon nanomaterial particles from aqueous solutions in the presence of a cationic surfactant are shown.
We present a measurement of the fundamental parameter of the standard model, the weak mixing angle sin2θℓeff which determines the relative strength of weak and electromagnetic interactions, in ...pp¯→Z/γ*→e+e- events at a center of mass energy of 1.96 TeV, using data corresponding to 9.7 fb-1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron. The effective weak mixing angle is extracted from the forward-backward charge asymmetry as a function of the invariant mass around the Z boson pole. The measured value of sin2θℓeff=0.23147±0.00047 is the most precise measurement from light quark interactions to date, with a precision close to the best LEP and SLD results.
One of the most common methods for the production of composites is the vacuum infusion method, which consists in the use of a disposable flexible punch pressed to the surface of the mold by ...atmospheric pressure. A new technology is the use of reusable flexible punches also pressed by atmospheric pressure. The paper compares the profitability of the same construction by these methods production.
Highly dispersed solid solutions Mn
0.20
Ce
0.80
O
2–δ
and M
0.05
Mn
0.15
Ce
0.80
О
2–δ
, where M = Cu, Bi, were prepared by coprecipitation followed by heat treatment. The materials were ...characterized by X-ray diffraction analysis, energy-dispersive X-ray spectroscopy, low-temperature nitrogen adsorption, transmission electron microscopy, and gas chromatography. The compounds prepared exhibit high activity in complete oxidation of methane. The solid solutions show promise as palladium supports. The 0.5% PdО/Mn
0.20
Ce
0.80
O
2–δ
and 0.5% PdО/Cu
0.05
Mn
0.15
Ce
0.80
O
2–δ
samples synthesized surpass in the catalytic activity the reference catalyst 0.5 PdО/γ-Al
2
O
3
. Thus, it is appropriate to use the complex oxide formulations as supports of the active component.
In this study, free radical scavenging abilities of ferulic acid in relation to its structural characteristics were evaluated in solution, cultured neurons, and synaptosomal systems exposed to ...hydroxyl and peroxyl radicals. Cultured neuronal cells exposed to the peroxyl radical initiator AAPH die in a dose-response manner and show elevated levels of protein carbonyls. The presence of ferulic acid or similar phenolic compounds, however, greatly reduces free radical damage in neuronal cell systems without causing cell death by themselves. In addition, synaptosomal membrane systems exposed to oxidative stress by hydroxyl and peroxyl radical generators show elevated levels of oxidation as indexed by protein oxidation, lipid peroxidation, and ROS measurement. Ferulic acid greatly attenuates these changes, and its effects are far more potent than those obtained for vanillic, coumaric, and cinnamic acid treatments. Moreover, ferulic acid protects against free radical mediated changes in conformation of synaptosomal membrane proteins as monitored by EPR spin labeling techniques. The results presented in this study suggest the importance of naturally occurring antioxidants such as ferulic acid in therapeutic intervention methodology against neurodegenerative disorders such as Alzheimer’s disease in which oxidative stress is implicated.
Agriculture is important for the sustenance of any country. But the incomes realized by agricultural producers are lower compared to those obtained in other sectors. The predominant representatives ...in the sector are micro and small enterprises. They do not have sufficient financial means to make the necessary investments in the enterprise's activity process, and their access to external financing is very limited. This necessitates the key role of state intervention in order to preserve the well-being and development of agriculture in the country. By providing state support to cooperatives, the sustainable development of agricultural producers is promoted. It aims to support the economic development of rural areas and to increase the competitiveness of agriculture in general. Based on the results obtained from the applied regression model with fixed effects, evidence is found for the positive influence of state support on the profitability of agricultural cooperatives in the South-East region of the Republic of Bulgaria. It is established that the innovation and investment activity, as well as the size of the agricultural cooperatives in the South-East region of Bulgaria, are statistically significant indicators that influence the receipt of state support.
We present the observation of doubly-produced $J/\psi$ mesons with the D0 detector at Fermilab in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV. The production cross section for both singly and ...doubly-produced $J/\psi$ mesons is measured using a sample with an integrated luminosity of 8.1~fb$^{-1}$. For the first time, the double $J/\psi$ production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section \sigteff, a parameter characterizing an effective spatial area of the parton-parton interactions and related to the parton spatial density inside the nucleon.
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