Interface characteristics of textured composite solid lubricant coating to improve the tribological performance of TC4 by Shaoqian Qin, Xiaoliang Shi, Yuchun Huang, Kaipeng Zhang, Qipeng Huang, Chaohua Wu

“…The results show that the coating improves the microhardness of TC4 surface, and appropriate texture density effectively suppresses the stress of contact interface so that the average friction coefficient of TC4-based composite solid lubricant coating with 25% wavy texture density sample (TCWs-SW25) is 50.24% lower than that of TC4, and the average wear loss is reduced by 97.66%. …”
Get full text

Arctic Climate Variability and Trends from Satellite Observations by Xuanji Wang, Jeffrey Key, Yinghui Liu, Charles Fowler, James Maslanik, Mark Tschudi

“…Correspondingly, annually averaged surface albedo has decreased at a decadal rate of −3.2%. …”
Get full text

The Physicochemical Properties of Deposited Sediments at the Maruba Dam Reservoir Inlet, Machakos County, Kenya by Allois Luvai, John Obiero, Christian Omuto

“…The average values for sediment pH, organic matter, porosity, bulk density, electrical conductivity, penetration resistance, hydraulic conductivity, and nutrients were 6.30 and 6.61; 1.91 and 1.80%; 54.10 and 57.10%; 1.22 and 1.14 g·cm−3 for the surface and sub-surface horizons, respectively. …”
Get full text

AGE-RELATED AND LOCATION PECULIARITIES OF TOOTH ENAMEL RESTITUTION by А. А. Udod, А. S. Voronina

“…This process was slower in the cervical area (2,95 ± 0,11 points). On average for the full restoration of the structure of the enamel surface in the equator area of the upper central incisor in the first group took 4,85 ± 0,12 days, in the cervical area – 5,73 ± 0,16 days, in the area of the cutting edge – 6,15 ± 0 17 days. …”
Get full text

CRYOGENESIS AND GEODYNAMICS OF ICING VALLEYS by V. R. Alekseyev

“…Combined, these processes lead to rapid and often incidental reconfigurations of the surface and subsurface runoff channels, abrupt uplifting and subsiding of the ground surface, decompaction and 'shaking-up' of seasonally freezing/thawing rocks, thereby producing exceptionally unfavourable conditions for construction and operation of engineering structures.Formation and development of river networks are heavily influenced by aufeis deposits and processes taking place at the aufeis surfaces, especially in areas of discontinuous and continuous permafrost where an average thickness of the ice cover on rivers ranges from 1.0 to 2.5 m, and the major part of the ice cover is accumulated layer by layer due to freezing of discharged groundwater. …”
Get full text

Vertical distribution of road traffic noise by R. MAKAREWICZ, R. GOŁĘBIEWSKI

“…Road noise generated by freely flowing traffic is assessed by the time-average sound level, LAT. The noise interaction with the ground surface is the only wave phenomenon that modifies geometrical spreading. …”
Get full text

Modeling of contact stresses and evaluation of wear life of a valve mechanism guide with lubricating grooves by K.E. Holenko, A.A. Vychavka, M.O. Dykha, V.O. Dytyniuk

“…The profile tool is designed to restore valve guides by rolling a spiral groove on the inner surface of the sleeve. After applying this technology, a spiral oil-retaining profile remains on the surface of the sleeve bore. . …”
Get full text

Synthesis and characterization of PVP-functionalized superparamagnetic Fe3O4 nanoparticles as an MRI contrast agent

“…The magnetite (Fe3O4) nanoparticles (MNPs) coated with poly(N-vinyl pyrrolidone) (PVP) via covalent bonds were prepared as T2 contrast agent for magnetic resonance imaging (MRI). The surface of MNPs was first coated with 3-(trimethoxysilyl) propyl methacrylate (silan A) by a silanization reaction to introduce reactive vinyl groups onto the surface, then poly(N-vinyl pyrrolidone) was grafted onto the surface of modified-MNPs via surface-initiated radical polymerization. …”
Get full text

Ablation measurement and modeling on the Sygyktinsky Glacier (the Kodar Ridge) by E. Y. Osipov, O. P. Osipova

“…Ablation was measured conventionally (using snow stakes and ultrasonic sensor) and calculated basing on a surface heat balance (SHB). The average and total values of measured and calculated ablation are in a good agreement with each other, while daily fluctuations in the ablation may differ due to changes in the surface density. …”
Get full text

Microstructure and characteristics of nickel coatings deposited on titanium alloy by cold spraying by Oleksandr Shorinov, Sergii Polyviany, Nina Savchenko, Roman Ipatov

“…The average microhardness values were from 190 HV to 290 HV, exceeding the required 180 HV. …”
Get full text

Climate Change Impacts on Winter Wheat Yield in Northern China by Xiu Geng, Fang Wang, Wei Ren, Zhixin Hao

Get full text

Ratchet effect in brownian photomotors: symmetry constraints and going beyond them by M. L. Dekhtyar, V. M. Rozenbaum, N. G. Shkoda, M. I. Ikim

Get full text

Spatiotemporal Distribution of Submesoscale Eddies with Updated Interferometric Imaging Radar Altimeter Data by Huaqian Hou, Tengfei Xu, Yonggang Wang, Yaohua Zhu, Zexun Wei, Siyong Liu, Xiaohong Sui

“…This seasonal trend is also evident in surface drifting buoy temperature data. The average temperature fluctuation induced by multiple SEs can reach 0.2 °C, indicating a sub-mesoscale vertical heat flux surpassing that of mesoscale eddies across all oceanic regions. …”
Get full text

Analysis of Water Film Distribution and Aerodynamic Performances of High-Speed Train Under Rainfall Environment by Meixiang Li, Mengge Yu, Jiali Liu, Xugao Sheng

“…The calculation results show that raindrops will gather on the train surface and form water film under rainfall environment. …”
Get full text

Comparative Study of Amniotic Membrane Fixation Methods in the Treatment of Persistent Corneal Epithelial Defects by A. N. Kulikov, S. V. Churashov, V. V. Karpovich, V. F. Chernysh, Yu. V. Kozlova, V. A. Bogdanov

“…The average operation time in the main group was 19 (17; 21) min and in the control group was 30 (25; 35) min. …”
Get full text

A Hypothetical Vascular Stent with Locally Enlarged Segment and the Hemodynamic Evaluation by Yudi Niu, Anqiang Sun, Zixuan Wang, Chenghong Yao, Juxingsi Song

“…Besides, the average wall shear stress (WSS) at sidewalls increased at 9.2% while the average WSS on the host artery wall decreased at 14.1%. …”
Get full text

MONITORING WHITE MOLD SCLEROTIA PERORATES TO REDUCE THE RISKS IMPACT ON IMPORTED SOYBEAN SEEDS by Tarek FOUDA, Asaad DERBALA, Adel HELAL, Amina ALBEBANY

“…The size is 55.8 to 71.93mm3, the average geometric diameter is from 4.66 to 5.05mm. …”
Get full text

Tribocorrosion Behavior of Laser-Cladded FeCrBSi Medium-Entropy Alloy Coatings by WANG Yanfang, ZHANG Yunpeng, CAO Chenjie, LIU Yanle, WANG Yunxuan, SHI Zhiqiang

“…Marine oil and gas engineering equipment suffers significant damage due to seawater corrosion and mechanical wear.Medium-entropy alloys， with their combined wear and corrosion resistance， are considered ideal materials for surface protective coatings.In this study， a FeCrBSi medium-entropy alloy coating was prepared on the surface of 316L stainless steel via laser cladding technology.The microstructure and tribocorrosion coupling behavior of the cladded layer were analyzed using X-ray diffraction (XRD)， metallographic microscopy and electrochemical corrosion and tribological tester.Results showed that the cladding layer consisted of dual-phase FCC and BCC solid solutions.The cladded zone was primarily composed of dendritic structures， while the bonding zone exhibited planar crystals.The average hardness of the FeCrBSi medium-entropy alloy coating reached 939 HV0.2， approximately 4.4 times that of the 316L stainless steel substrate.As the applied frictional load increased， the coefficient of friction of the coating decreased， with average values ranging from 0.2 to 0.5.The maximum wear volume was 0.052 mm3， indicating a significant improvement in wear resistance compared to the substrate.Electrochemical testing in a 3.5%(mass fraction) NaCl solution demonstrated superior corrosion resistance compared to 316L stainless steel， as indicated by a self-corrosion potential of -0.05 V and a corrosion current density of 1.45×10－7 A/cm2.Under the combined effect of frictional load and externally applied corrosion potential， both the average current density and wear volume increased with increasing potential， while the friction coefficient decreased.A synergistic interaction between corrosion and wear was observed.Notably， corrosion-induced wear contributed over 92.5%to the total material loss， demonstrating its dominant role.…”
Get full text

Effect of Metal Foam Structure on Pool Boiling Heat Transfer Characteristics by Hu Chenyu, Lai Zhancheng, Hu Haitao, Han Weizhe

“…Pool boiling heat transfer characteristics of a refrigerant on heating surfaces of metal foams of different structures were experimentally studied. …”
Get full text

THE IMPACT OF RELIGIOUS TRADITIONS ON CONSUMERS' BEHAVIOUR AND FOOD PRODUCTS' CERTIFICATION by Decebal-Ștefăniță PĂDURE, Petru ALEXE, Nicoleta STĂNCIUC, Marius Mihai MICU, Eduard Alexandru DUMITRU

“…The county obtains a total production of 429,879.67 t, to which the largest contributions have been brought, maize grains (53.73%-higher than the surface), wheat and rye (39.61%-less weight than in the case of the surface), the rest of the crops having contributions below 4%. …”
Get full text