Abstract
The paper highlights the features of the implementation of on-board systems for monitoring the earth’s surface, based on small aircraft. The problems of fusion of location information from ...on-board monitoring systems of various types of functioning are considered. The motivation of integrating optical and radar images of the earth’s surface is shown. The result of the work is the synthesis of optical and radar images of the earth’s surface into a single information field.
The possibility of creating a biofuel cell based on a metal stent was shown in this study. Given the existing stent implantation approaches, the integration of a biofuel cell into a stent naturally ...entails capacity for biofuel cells to be installed into a human body. As a counter electrode, a hydrogel based on iota-carrageenan, polyvinyl alcohol, and PEDOT:PSS, with an immobilized glucose oxidase enzyme, was proposed. Tension tests demonstrated that the hydrogel mechanical behavior resembles that of a bovine's vein. To obtain an analytical description, the deformation curves were fitted using Gent and Ogden models, prompting the fitting parameters which can be useful in further investigations. During cyclic biaxial studies the samples strength was shown to decreases insignificantly in the first 50 cycles and, further, remains stable up to more than 100 cycles. The biofuel cell was designed with the PEDOT:PSS based material as an anode and a Co–Cr self-expanding stent as a cathode. The maximum biofuel cell power density with a glucose concentration of 5 mM was 7.87 × 10−5 W in phosphate buffer and 3.98 × 10−5 W in blood mimicking buffer. Thus, the biofuel cell integration in the self-expanding stent was demonstrated.
Biosensors; PEDOT:PSS; Biotechnology; Internet of things; Biofuel cell.
The 3D reconstruction of 100 μm- and 600 μm-thick fibrous poly-L/L-lactide scaffolds was performed by confocal laser scanning microscopy and supported by scanning electron microscopy and showed that ...the density of the fibers on the side adjacent to the electrode is higher, which can affect cell diffusion, while the pore size is generally the same. Bone marrow mesenchymal stem cells cultured in a 600 μm-thick scaffold formed colonies and produced conditions for cell differentiation. An in vitro study of stem cells after 7 days revealed that cell proliferation and hepatocyte growth factor release in the 600 μm-thick scaffold were higher than in the 100 μm-thick scaffold. An in vivo study of scaffolds with and without stem cells implanted subcutaneously onto the backs of recipient mice was carried out to test their biodegradation and biocompatibility over a 0–3-week period. The cells seeded onto the 600 μm-thick scaffold promoted significant neovascularization in vivo. After 3 weeks, a significant number of donor cells persisted only on the inside of the 600 μm-thick scaffold. Thus, the use of bulkier matrices allows to prolong the effect of secretion of growth factors by stem cells during implantation. These 600 μm-thick scaffolds could potentially be utilized to repair and regenerate injuries with stem cell co-culture for vascularization of implant.
CO2 hydrogenation to methanol is an important process that could solve the problem of emitted CO2 that contributes to environmental concern. Here we developed Cr-, Cr-Zn-, and Cr-Ni-containing ...nanocomposites based on a solid support (SiO2 or Al2O3) with embedded magnetic nanoparticles (NPs) and covered by a cross-linked pyridylphenylene polymer layer. The decomposition of Cr, Zn, and Ni precursors in the presence of supports containing magnetic oxide led to formation of amorphous metal oxides evenly distributed over the support-polymer space, together with the partial diffusion of metal species into magnetic NPs. We demonstrated the catalytic activity of Cr2O3 in the hydrogenation reaction of CO2 to methanol, which was further increased by 50% and 204% by incorporation of Ni and Zn species, respectively. The fine intermixing of metal species ensures an enhanced methanol productivity. Careful adjustment of constituent elements, e.g., catalytic metal, type of support, presence of magnetic NPs, and deposition of hydrophobic polymer layer contributes to the synergetic promotional effect required for activation of CO2 molecules as well. The results of catalytic recycle experiments revealed excellent stability of the catalysts due to protective role of hydrophobic polymer.
Endothelial dysfunction is among the major triggers of cardiovascular disease, also promoting thrombosis, restenosis, and neoatherosclerosis within the conduit and coronary artery upon the coronary ...artery bypass graft surgery. To recapitulate the paracrine interactions between arterial and venous endothelial cells (ECs) by cross-addition of the conditioned medium to the respective cell cultures. Conditioned (24 hours) serum-free medium from confluent primary human coronary artery ECs (HCAEC), primary human internal thoracic artery ECs (HITAEC) and primary human saphenous vein ECs (HSaVEC) was added to a confluent monolayer of intact HCAEC, HITAEC, and HSaVEC for another 24 hours. Cellular response has been assessed by reverse transcription-quantitative polymerase chain reaction, Western blotting and enzyme-linked immunosorbent assay. Gene expression analysis showed that HITAEC-conditioned medium ameliorated inflammatory response in HCAEC, in contrast to HSaVEC-conditioned medium. In turn, HCAEC-conditioned medium maintained the endothelial phenotype of HITAEC. Further, HCAEC- and HITAEC-conditioned medium stimulated release of pro-angiogenic molecules by intact HCAEC and HSaVEC cultures. HSaVEC-conditioned medium notably reduced the secretion of pro-inflammatory cytokine interleukin-6 in all cell cultures.
Conclusions
: Paracrine interactions between HITAEC and HCAEC govern their anti-inflammatory status and enhance HCAEC angiogenic potential, partially explaining the higher primary patency of arterial conduits and resistance of coronary artery to thrombosis, restenosis and neoatherosclerosis in the long-term period after total arterial revascularisation.
The analysis of trends in the development of resource assessment methods is given, a multi-level information-kinetic approach to acoustic emission diagnostics is described and its methodological ...relationship with the traditional experimental method of resource assessment is shown. The informative multi-model diagnostic parameters associated with various scale level strength characteristics of structural materials and resource technical objects are given. The examples of resource assessment of welded joints and rolling bearings are considered.
During the period of production and exploiting of materials, complex physicochemical processes of interaction of their components with each other and with the environment take place. Identifying the ...mechanisms of this interaction will help to understand its various aspects and to optimize the technological processes of manufacturing materials with desired properties. The solution of this problem can be based on the interpretation of the results of acoustic emission (AE) tests from the standpoint of a multilevel model of the time dependences of the parameters of AE heterogeneous materials.
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