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Load-carrying capacity of Wc/c-coated gears lubricated with a low-viscosity oil

LUBRIcATION ScIENcE 2016年第3期28卷 127-139页

作者： Krzan, Boris Univ Ljubljana Fac Mech Engn Ljubljana 61000 Slovenia

The application of low-friction coatings on the surfaces of gear teeth is primarily motivated by the increasing demands for load-carrying capacity or the rolling-contact fatigue life. Despite the costs of manufacturing being higher, better performance is an important consideration for many demanding applications. In the present study, we have investigated the load-carrying capacity of Wc/c-coated gears that were lubricated with an oil blend that was formulated in-house. A significantly higher load-carrying capacity was found for the Wc/c-coated gears lubricated with a tailored, low-viscosity oil in comparison with the case-carburised gears lubricated with a conventional gear oil of a similar viscosity. The carburised gears failed due to scuffing on the pinion tip, while coating thinning on the pinion face and coating fracture in the wheel-root area are the dominant failure mechanisms for Wc/c-coated gears. An approximately 40% lower roughness was found on the coated gear flanks. copyright (c) 2015 John Wiley & Sons, Ltd.

关键词： gears Wc c lubrication load-carrying capacity surface roughness

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Wear modelling and sealing performance prediction of c/c composite finger seal

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PROcEEDINGS OF THE INSTITUTION OF MEcHANIcAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY 2023年第5期237卷 1142-1155页

作者： Lu, Fei Liu, Jian Pang, Xianjuan Song, chenfei Xu, Zhidong Henan Univ Sci & Technol Sch Vehicle & Transportat Engn Luoyang 471023 Peoples R China Henan Univ Sci & Technol Natl United Engn Lab Adv Bearing Tribol Luoyang Peoples R China China Petr First Construct Corp Ltd Int Engn Branch Luoyang Peoples R China

Due to the high speed and high pressure operating conditions, wear between the finger seal and the rotor is inevitable, and this leads to an increase of leakage clearance and becomes an important factor affecting the seal life. The theory of anisotropic elasticity was employed to describe the mechanical characteristics of the seal material. An improved Archard wear model was proposed to calculate the nodal wear rate, and the local wear direction was also determined. The wear simulation model and procedure were established based on the Arbitrary Lagrangian Eulerian adaptive mesh strategy. The effects of material density, fabric orientation, pressure differential and rotor speed on the wear characteristics of finger seal and the change of leakage clearance caused by wear loss were studied. The results show that the wear first occurs at the heel area of the finger foot bottom and gradually extends to the toe area. c/c (carbon fibre reinforced carbon matrix) composite finger seal with higher material density has smaller leakage clearance and wear depth. With the increase of fabric orientation angle, the wear depth in the heel area of finger foot is smaller, and the circumferential wear area is narrower. The average wear depth of finger seal decreases with the orientation angle. When the orientation angle is 0, the seal leakage clearance is smaller. The increase of pressure differential not only aggravates the seal wear, but also expands the wear area, and also increases the average contact pressure and leakage clearance. Increasing the rotor speed make the wear depth of the heel area of finger foot gradually increase, but the wear area becomes narrower. The average contact pressure decreases and the average leakage clearance increases. This study provides a theoretical method and basis for the prediction and evaluation of the wear life and performance of c/c composite finger seal.

关键词： finger seal c c composite FE simulation wear depth seal leakage

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Ultrasensitive Detection of Hepatitis c Virus DNA Subtypes Based on cucurbituril and Graphene Oxide Nano-composite

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chemical Research in chinese Universities 2020年第2期36卷 307-312页

作者： JIANG Ping LI Yifei JU Ting cHENG Wenbo XU Jianhua HAN Kun University of Science and Technology of China Hefei 230027P.R.China C/LS Key Lab of Bio-medical Diagnostics Suzhou Institute of Biomedical Engineering and TechnologyChinese Academy of SciencesSuzhou 215163P.R.China University of Chinese Academy of Sciences Beijing 100049P.R China Institute of Optics and Electronics Chengdu 610209P.R.China Laboratory of Oncology Science and Molecular Biology Shunde Hospital of Guangzhou University of Chinese MedicineFoshan 528333P.R.China

Infectious of hepatitis c viruses(HcVs)lead to hepatic fibrosis,cirrhosis even *** rapid and sensitive diagnostic method for HcV is of great *** on the host-and-guest interaction between cucurbit[7]uril(cB[7])and methylene blue(MB),a cB[7]-graphene nano-composite(cB[7]-N3-GO)is raised for the electrochemical detection of HcV *** method is able to linearly detect the HcV nucleic acid in the range of 0.2—10 nmol/L with detection limit as low as 160.4 pmol/*** proposed detection strategy is able to discriminate the lb and 6k subtypes of HcV and has a prospective potential in the blood screen for HcV in clinical diagnosis.

关键词： Hepatitis c virus cucurbituril Graphene Nano-composite Assay

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Electrochemical Activation of Li2MnO3 Electrodes at 0 °c and Its Impact on the Subsequent Performance at Higher Temperatures

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MATERIALS 2020年第19期13卷 4388页

作者： Susai, Francis Amalraj Talianker, Michael Liu, Jing Rosy Paul, Tanmoy Grinblat, Yehudit Erickson, Evan Noked, Malachi Burstein, Larisa Frenkel, Anatoly I. Tsur, Yoed Markovsky, Boris Aurbach, Doron Bar Ilan Univ Dept Chem IL-52900 Ramat Gan Israel Bar Ilan Univ Inst Nanotechnol & Adv Mat IL-52900 Ramat Gan Israel Ben Gurion Univ Negev Dept Mat Engn IL-84105 Beer Sheva Israel Manhattan Coll Dept Phys New York NY 10471 USA Technion Israel Inst Technol Dept Chem Engn IL-3200003 Haifa Israel Technion Israel Inst Technol Grand Technion Energy Program IL-3200003 Haifa Israel Tel Aviv Univ Wolfson Appl Mat Res Ctr IL-69978 Tel Aviv Israel SUNY Stony Brook Dept Mat Sci & Chem Engn Stony Brook NY 11794 USA

This work continues our systematic study of Li- and Mn- rich cathodes for lithium-ion batteries. We chose Li2MnO3 as a model electrode material with the aim of correlating the improved electrochemical characteristics of these cathodes initially activated at 0 degrees c with the structural evolution of Li2MnO3, oxygen loss, formation of per-oxo like species (O-2(2-)) and the surface chemistry. It was established that performing a few initial charge/discharge (activation) cycles of Li2MnO3 at 0 degrees c resulted in increased discharge capacity and higher capacity retention, and decreased and substantially stabilized the voltage hysteresis upon subsequent cycling at 30 degrees c or at 45 degrees c. In contrast to the activation of Li2MnO3 at these higher temperatures, Li2MnO3 underwent step-by-step activation at 0 degrees c, providing a stepwise traversing of the voltage plateau at >4.5 V during initial cycling. Importantly, these findings agree well with our previous studies on the activation at 0 degrees c of 0.35Li(2)MnO(3)center dot 0.65Li[Mn0.45Ni0.35co0.20]O-2 materials. The stability of the interface developed at 0 degrees c can be ascribed to the reduced interactions of the per-oxo-like species formed and the oxygen released from Li2MnO3 with solvents in ethylene carbonate-methyl-ethyl carbonate/LiPF6 solutions. Our TEM studies revealed that typically, upon initial cycling both at 0 degrees c and 30 degrees c, Li2MnO3 underwent partial structural layered-to-spinel (Li2Mn2O4) transition.

关键词： lithium-ion batteries Li and Mn-rich materials Li2MnO3 activation at 0 ° c stabilized cycling decreased the voltage hysteresis layered-to-spinel transition bulk and surface characteristics

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Porous coP/c derived from metal-organic framework as high-performance anode materials for superior lithium storage

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IONIcS 2023年第5期29卷 2087-2092页

作者： Huang, Binqi Liu, Jiaming Hu, Xingrong Lin, Xing Zhang, Lu Li, Wei Jiangxi Univ Sci & Technol Fac Mat Met & Chem Ganzhou 341000 Peoples R China Yunnan Univ Sch Chem Sci & Technol Kunming 650091 Peoples R China

coP has attracted increasing attention due to its high theoretical capacity for lithium storage. However, coP suffers from a large volume expansion during cycling, which leads to electrode pulverization and poor cycle stability. In addition, the conductivity of coP is poor, resulting in undesirable rate performance. To solve this problem, the coP/c composite was prepared based on the in-situ phosphating heat treatment technology of co-BTc MOF. The as prepared coP/c exhibits a good lithium storage specific capacity and a cycle stability, which is attributed by the synergistic effect of the porous nanostructure and carbon frame. The porous nanostructure of the coP/c allows the electrolyte to easily penetrate into the interior, which increases the number of electrochemical reaction sites while effectively mitigating the volume expansion during lithiation and improving electrical conductivity. Thanks to the special structures, the discharge specific capacity of the Lithium-ion batteries (LIBs) based the coP/c as anode materials is 645.7 mAh g(-1) after 200 cycles at a current density of 200 mA g(-1). This work demonstrates that the coP/c has a great potential as a next generation anode material for LIBs.

关键词： coP c Porous nanostructure Anode materials Lithium-ion batteries

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Superior hydrogen generation from sodium borohydride hydrolysis catalyzed by the bimetallic co-Ru/c nanocomposite

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2021年第50期46卷 25376-25384页

作者： Huang, Wenkai Xu, Fuhua Liu, Xiang China Three Gorges Univ Engn Res Ctr Ecoenvironm Three Gorges Reservoir R Key Lab Inorgan Nonmetall Crystalline & Energy Co Coll Mat & Chem EngnMinist Educ Yichang 443002 Hubei Peoples R China

Sodium borohydride has been widely regarded as a promising hydrogen carrier owing to its greatly hydrogen storing capability (10.8 wt%), high weight density and excellent stability in alkaline solutions. Herein, we first design and synthesize a series of bimetallic M-Ru/c nanocomposites (including Fe-Ru/c, co-Ru/c, Ni-Ru/c and cu-Ru/c), via simply alloying of commercial Ru/c with nonprecious metal, for superior H2 evolution from the NaBH4 hydrolysis. The result exhibits that H2 generation is synergetically improved by alloying Ru/ c with co or Ni, while it is hindered by alloying Ru/c with Fe or cu. Indeed, co-Ru/c presents the highest efficient catalytic activity for H2 generation, with the TOF of 117.69 mol(H2)center dot molRu-1 center dot min-1, whereas Ru/c is only 57.08 mol(H2)center dot molRu-1 center dot min-1. In addition, the TOF of co-Ru/c reaches to 436.51 mol(H2)center dot molRu-1 center dot min-1 (96.7 L(H2)center dot gRu-1 center dot min-1) in the presence of NaOH. (c) 2021 Hydrogen Energy Publications LLc. Published by Elsevier Ltd. All rights reserved.

关键词： Sodium borohydride Hydrogen co-Ru c Bimetallic Hydrolysis

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Photoreactive polymer and c,H-insertion reaction to tailor the properties of cHA/gelatin-based scaffold

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INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND cHARAcTERIZATION 2022年第5期27卷 326-345页

作者： Ardhani, Retno Suraya, Tiyastiti Wulanjati, Martha Purnami Ana, Ika Dewi Ruehe, Jurgen Pidhatika, Bidhari Univ Gadjah Mada Fac Dent Dept Dent Biomed Sci Yogyakarta Indonesia Minist Ind Ctr Standardizat & Ind Serv Leather Rubber & Plas Jl Sokonandi 9 Yogyakarta Indonesia Natl Res & Innovat Agcy Republ Indonesia PRTPP BR Res Ctr Food Technol & Proc Yogyakarta Indonesia Univ Freiburg Freiburg Inst Interact Mat & Bioinspired Technol Dept Microsyst Engn IMTEK DFG Cluster Excellence LivMatS Freiburg Germany Natl Res & Innovat Agcy Republ Indonesia BRIN Jakarta Indonesia

A series of photoreactive polymers containing poly(N,N-dimethylacrylamide) and 2-hydroxy-(4-methacryloyloxybenzophenone), P(DMAA-n%MABP-OH), was explored to modify sheet-formed carbonated hydroxyapatite/gelatin (cHA/gelatin) scaffold. Under UV-light illumination, the benzophenones react with any c-H bonds in their vicinity through a c,H-insertion mechanism, enabling PDMAA-based hydrogel formation that is covalently attached to the gelatin. NMR spectroscopy confirmed the chemical structure of P(DMAA-n%MABP-OH) polymers with aimed n = 1, 5, 10, while GPc determined their molecular masses. The benzophenone reactivity under UV-light illumination for 0-240 min. was demonstrated using UV-Vis spectroscopy at 240-400 nm. After immobilization of P(DMAA-n%MABP-OH) onto the cHA/gelatin scaffold, typical FTIR vibration bands of both compounds could be detected on the spectra of the modified scaffolds. SEM images showed that the scaffold is highly porous with approximately 100 mu m thickness. P(DMAA-n%MABP-OH) addition led to 2-3 times increase in thickness and 15-19% mass addition. Furthermore, it was shown that chemical (degradation and ca2+ release profile), physical (4-7 swelling index), mechanical (0.06-0.17 MPa wet tensile strength and 0.2-0.8 MPa elastic modulus), and biological (cell adhesion) properties of the scaffold could be tailored by varying the photocrosslinker content. cytotoxicity test showed that all studied cHA/gelatin-based scaffolds were nontoxic (>80% cell viability).

关键词： c H-insertion crosslinking hydrogel photoreactive polymer scaffold

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Determinations of combustion and formation enthalpies of c_(60)and c_(70)

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Science china chemistry 1998年第5期41卷 543-548页

作者：安绪武陈斌何俊 1. Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China

By using a micro\|bomb calorimeter, the standard enthalpies of combustion of c 60 and c 70 have been determined to be -(25 947.1±8.5) and -(29 956.1±8.9) kJ/mol respectively. A g.l.c. analysis indicated that the amounts of residual organic solvents in the samples were very small, and their effects on the final results were negligible. The energy of combustion of c 60 determined in this work is in agreement in the uncertainty interval with that determined by means of traditional calorimeter using macro amount of sample. The enthalpies of formation of these two substances have been derived. The strain energies in the molecules of c 60 and c 70 were estimated by a bond energy scheme and by using corannulene as the model compound, the results estimated from different methods are very close.

关键词： c 60 c 70 enthalpy of combustion enthalpy of formation molecular strain energy.

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Effects of Pore on Thermal Diffusivity and Thermal Radiation Properties of c/Sic composites at High Temperatures

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APPLIED cOMPOSITE MATERIALS 2019年第5-6期26卷 1411-1422页

作者： Wang, Fuyuan cheng, Laifei Liang, Shuhua Xian Univ Technol Sch Mat Sci & Engn Xian 710048 Shaanxi Peoples R China Xian Univ Technol Shaanxi Prov Key Lab Elect Mat & Infiltrat Techno Xian 710048 Shaanxi Peoples R China Northwestern Polytech Univ Sci & Technol Thermostruct Composite Mat Lab Xian 710072 Shaanxi Peoples R China

The effects of pore in c/Sic composites on thermal diffusivity and thermal radiation properties were investigated systematically. Pores were introduced into c/Sic by oxidizing carbon phase at 700 degrees c and damaged the thermal properties of c/Sic composites. Because of little changes in the pore shape and the pore orientation in c/Sic, thermal diffusivity of samples increased linearly with porosity. The pores within c/Sic absorbed and reflected the radiated heat, decreasing spectral emissivity. However, the temperature dependence of spectral emissivity didn't change by the pore. With measurement temperature increasing, the pores weakened the thermal radiation property of samples gradually. A linear relation was suggested to quantify the negative effect of pores on the total emissivity.

关键词： c Sic Pore Thermal diffusivity Thermal radiation

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Evollionines A - c, Three New Alkaloids Isolated from the Fruits of Evodia rutaecarpa

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HELVETIcA cHIMIcA AcTA 2014年第11期97卷 1481-1486页

作者： Li, Yan-Hong He, Juan Li, Yan Wu, Xing-De Peng, Li-Yan Du, Ru-Nan cheng, Xiao Zhao, Qin-Shi Li, Rong-Tao Chinese Acad Sci Kunming Inst Bot State Key Lab Phytochem & Plant Resources West Ch Kunming 650201 Peoples R China Kunming Univ Sci & Technol Fac Life Sci & Technol Kunming 650500 Peoples R China

A phytochemical study of the cHcl3 extract of the dried unripe fruits of Evodia rutaecarpa (Juss.) Benth. (Rutaceae) resulted in the isolation of three new alkaloids, evollionines A-c (1-3, resp.), together with two known compounds, evodianinine and wuzhuyumide I. The structures of the new compounds were elucidated on the basis of detailed spectroscopic evidence and confirmed in the case of compound 1 by single-crystal X-ray analysis.

关键词： Evodia rutaecarpa Alkaloids Evollionines A&thinsp -&thinsp c Indole alkaloids

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