The paper solves the task of obtaining the technological conversion - three-component system ‘microdispersed mineral grain - microdispersed particle of viscous bitumen - water’ at consecutive dosing of raw material components at the asphalt-concrete plant. It is necessary to prepare the bitumen suspension of viscous consistency to avoid delamination of bitumen slurry, to ensure its transportation by dump trucks, storage in the excavation and loading. The authors propose to refuse to heat bitumen in winter and to use ready-made materials for road construction in cold form. The addition of mineral components will make it possible to produce cold analogues of long-term storage asphalt concrete mixtures at Russian enterprises.

2025-03-13·Transport automation research

Analytical Model for Calculating the Speed at Starting Hydroplaning in Unmanned Control Algorithms

作者: Gusev, Sergey ; Kuverin, Igor' ; Guseva, Inna

This paper presents an analytical model for vehicle speed calculations at starting aquaplaning in real-time road conditions. High percentage of accidents associated with speed violations in adverse weather conditions makes the study relevant. A mathematical model based on the integral equations of mass and momentum conservation taking into account the tire geometric parameters, water film characteristics and those of the road surface has been developed. The proposed model makes it possible to calculate the critical speed of aquaplaning initiation for a specific vehicle. The paper presents the results of the simulation researching various factors affecting the aquaplaning initiation speed according to the developed model. The results of the study can be used for improving road safety including the unmanned vehicle operation, transport infrastructure design, as well as carrying out vehicle expertise and ensuring an aircraft take-off and landing safety.

2025-01-01·Analytica Chimica Acta

Bottom-up designing nanostructured oxide libraries under a lab-on-chip paradigm towards a low-cost highly-selective E-nose

Article

作者: Artemov, Vasily ; Kiselev, Ilia V ; Trouillet, Vanessa ; Solomatin, Maksim A ; Goffman, Vladimir G ; Sysoev, Victor V ; Kirilenko, Demid A ; Sommer, Martin ; Bainyashev, Alexey M ; Nasibulin, Albert G ; Fedorov, Fedor S ; Rabchinskii, Maxim K ; Varezhnikov, Alexey S ; Geckle, Udo ; Ushakov, Nikolay M

BACKGROUNDThe multisensor concept has been developed as a powerful alternative to well-known gas-analytical instrumentation for applications where a fast but accurate and reliable assessment of the environment is required. The concept follows a biology-inspired approach where the selectivity towards various gases/odors is attained via pattern recognition of multisensory signal vectors. Herein, we discuss how to design a selective multisensor library based on various metal oxide nanostructures like a lab-on-chip using a simple but efficient bottom-up growth of materials over the multi-electrode chip under robust dc electrochemical protocols.RESULTSIn addition to a conventional growth of oxide layers over the metal electrodes, we show that the fine nanowall-like oxide structures appear as a quasi-matrixed percolation film over the SiO₂ substrate surface in the inter-electrode gaps to constitute a chemiresistive film. We have tested two directions while applying the technique to grow Co, Ni, Mn, and Zn oxides to develop on-chip sensor arrays of, (i) monoxide type employing the oxide films with gradual change of growth time, and (ii) multi-oxide type based on the four oxides. The materials were thoroughly characterized by electron microscopy, X-ray diffraction, thermogravimetric analysis, and X-ray photoelectron spectroscopy/mapping to prove the composition and structure. Among tested oxides, ZnO readily appears not only at the electric potential-targeted chip zone but also in other areas to dope the films for yielding heterojunctions with other oxides that enhances a variability of functional properties in the on-chip sensor array. The gas-sensing performance of the chips has been tested versus various chemically akin alcohol vapors at the sub- and low ppm range of concentrations in a mixture with air.SIGNIFICANCEWe show that the grown oxide nanostructures exhibit a high-sensitive chemiresistive signal which allows one to build a multisensor vector signal, selective to the kind of alcohols, even at sub-ppm concentrations. Moreover, the multi-oxide library yields options for a superior selectivity under LDA metrics than the gradient-grown mono-oxide one due to the versatility of materials while the low-cost growth protocols remain to be the same in both cases. The delivered method to produce multisensor arrays allows one producing low-cost but efficient electronic nose units for numerous applications.

100 项与 Yuri Gagarin State Technical University of Saratov 相关的药物交易

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100 项与 Yuri Gagarin State Technical University of Saratov 相关的转化医学

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