FG-LiquID

Contact-less liquid identification via wireless sensing has diverse potential applications in our daily life, such as identifying alcohol content in liquids, distinguishing spoiled and fresh milk, and even detecting water contamination. Recent works have verified the feasibility of utilizing mmWave radar to perform coarse-grained material identification, e.g., discriminating liquid and carpet. However, they do not fully exploit the sensing limits of mmWave in terms of fine-grained material classification. In this paper, we propose FG-LiquID, an accurate and robust system for fine-grained liquid identification. To achieve the desired fine granularity, FG-LiquID first focuses on the small but informative region of the mmWave spectrum, so as to extract the most discriminative features of liquids. Then we design a novel neural network, which uncovers and leverages the hidden signal patterns across multiple antennas on mmWave sensors. In this way, FG-LiquID learns to calibrate signals and finally eliminate the adverse effect of location interference caused by minor displacement/rotation of the liquid container, which ensures robust identification towards daily usage scenarios. Extensive experimental results using a custom-build prototype demonstrate that FG-LiquID can accurately distinguish 30 different liquids with an average accuracy of 97%, under 5 different scenarios. More importantly, it can discriminate quite similar liquids, such as liquors with the difference of only 1% alcohol concentration by volume.

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

The unit pressure in the fine-grained material consolidation process in the roller press can reach over hundred MPa and is a parameter which results, among other things, from the properties of the consolidated material and the compaction unit geometry. Its value changes depending on the place on the molding surface. Generating different pressure on the surface of briquettes makes their compaction different. One’s own and other researchers’ experience shows that, in the case of exerting high pressure on the merged fine-grained material, the higher unit pressure exerted on the material, the higher temperature of the consolidated material is. The temperature distribution on the surface of the briquettes can testify the locally exerted pressure on the briquette. The stress distribution in the briquetting material is still a subject of research. The article includes thermography studies of the briquetting process of four material mixtures. Thermal images of briquettes were taken immediately after they left the compaction zone as well as forming rollers. The obtained thermograms and temperature variability at characteristic points of the surface of briquettes were analyzed. The correlation between the temperature distribution and the stress distribution in the briquettes was determined.

Comparative experimental research on falling ball test method and K30 plate load method on foundation of different structures

In highway and railway foundation projects, the mechanical properties of foundation materials are one of the main indicators of construction process control. The elastic modulus of foundation directly affects road surface deflection and must be tested. The falling ball test method and the K30 plate load method are widely used in engineering, In order to explore the relationship between the two methods and guide the engineering application, the falling ball test method and the K30 plate load method are applied to homogeneous materials (homogeneous fine-grained material layers) and layered materials(Old foundation).Through comparative test, we found that there is a strong correlation between the falling ball test method the K30 plate load method in some scenarios,which can be used for mutual reference in engineering experiments.

The Tefroid Deposits on an Active Stratovolkano Bezymianny (Kamchatka)

The article highlights the results of a study of volcanic processes on the large active stratovolcano Bezymyanny, located on the Eastern mountain range of Kamchatka, in the Klyuchevskoy group of Holocene volcanoes. It is one of the most active volcanoes in the world, characterized by continuous short-term explosive eruptions with powerful outbursts of ash material, accompanied by lava flows and the formation of extrusions. Among Russian and foreign volcanologists, this volcano became world famous on March 30, 1956, when a catastrophic eruption occurred, which in geological literature was called a "directed explosion" or "an eruption of the Bezymyanny type." In addition to volcanic structures, peculiar volcanic-sedimentary deposits of the volcano were also investigated, represented by the so-called tefroids, which are the product of the movement and washing of volcanic-clastic material of eruptions. Modern volcanological expeditions in Kamchatka and the Kuril Islands have made it possible to prove not only the synchronicity of the forming tefroid accumulations with volcanism, but also the extensive distribution of these rocks, which often prevail over volcanoterrigenous sediments. In all the modern volcanic regions studied in detail, a wide development of tefroid formations has been established. By age, tefroids develop from the early Precambrian to the present day. On the slopes of the volcano and in the area of development of dry streams, there is a constant movement of fine-grained material to the foot of the volcano. These freely moving material in the process of movement are sorted by size, roundness and form well-sustained thick tefroid layers. The volcano stands half submerged in these geologically instantaneously deposited tefroid strata.