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Prediction of temperature field in machined workpiece surface during the cutting of Inconel 718 coated with surface-active media

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Advances in Manufacturing 2023年第3期11卷 378-389页

作者： qing-An yin Zhan-Qiang Liu Bing Wang School of Mechanical Engineering Shandong UniversityJinan 250061People's Republic of China Key National Demonstration Center for Experimental Mechanical Engineering Education/Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE Jinan 250061People's Republic of China

The heat generated and accumulated on the machined surface of an Inconel 718 workpiece causes thermal damage during the cutting ***-active media with high thermal conductivity coated on the workpiece to be machined may have the potential to reduce the generation of cutting *** this study,a theoretical model for predicting the instantaneous machined surface temperature field is proposed for surface-active thermal conductive medium(SACM)-assisted cutting based on the finite element and Fourier heat transfer *** cutting experiments were performed to verify the results predicted using the proposed surface-temperature field *** SACMs with various thermal conductivities were used to coat Inconel 718 surface to be *** embedded into the workpiece were used to measure the cutting temperature at different points on the machined workpiece surface during the cutting *** experimental results were in agreement with the predicted temperatures,and the maximum error between the experimental results and predicted temperatures was approximately 9.5%.The cutting temperature on the machined surface decreased with an increase in the thermal conductivity of the *** graphene SACM with high thermal conductivity can effectively reduce the temperature from 542℃ to 402℃,which corresponds to a reduction of approximately 26%.The temperature reduction due to SACM decreases with an increase in the distance between the temperature prediction point and machined workpiece *** conclusion,the cutting temperatures on the machined workpiece surface can be reduced by coating with SACM.

关键词： Surface-active thermal conductive media(SACM) Finite element model Cutting heat Cutting temperature Inconel 718

Muscarinic acetylcholine receptor M1 mediates prostate cancer cell migration and invasion through hedgehog signaling

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Asian Journal of Andrology 2018年第6期20卷 608-614页

作者： qing-qing yin Lin-Hui Xu Mi Zhang Chen Xu Institute of Life Sciences Chongqing Medical UniversityChongqing 400016China.

The autonomic nervous system contributes to prostate cancer proliferation and metastasis. However, the exact molecular mechanism remains unclear. In this study, muscarinic acetylcholine receptor M1 （CHRM1） expression was measured via immunohistochemical analysis in human prostate cancer tissue array slides. PC-3, LNCaP, and A549 cells were treated with pirenzepine or carbachol, and the cell migration and invasion abilities were evaluated. Western blotting and quantitative real-time PCR were performed to measure GLI family zinc finger 1 （GLI1）, patched 1 （PTCH1）, and sonic hedgehog （SHH） expression levels. High expression of CHRM1 was found in early-stage human prostate cancer tissues. In addition, the selective CHRM1 antagonist pirenzepine inhibited PC-3, LNCaP, and A549 cell migration and invasion, but the agonist carbachol promoted the migration and invasion of these three cell lines. Muscarinic signaling can be relayed by hedgehog signaling. These data show that CHRM1 is involved in the regulation of prostate cancer migration and invasion through the hed^eho~ si^nalin~ ~athwav.

关键词： hedgehog signaling muscarinic acetylcholine receptor M1 (CHRM1) metastasis prostate cancer

Effects of Size Grading on Growth and Non-Specific Immunity Factors of the Shrimp Litopenaeus vannamei Boone

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Agricultural Sciences in China 2010年第3期9卷 416-422页

作者： LI Yu-quan LI Jian WANG qing-yin College of Animal Science and Technology Qingdao Agricultural University Qingdao 266109 P.R.China Key Laboratory for Sustainable Utilization for Marine Fisheries Resource Ministry of Agriculture~Yellow Sea Fisheries Research Institute Chinese Academy of Fisheries Science Qingdao 266071 P.R.China

The study aims to determine the effects of graded farming on growth performance and non-specific immunity factors of shrimp Litopenaeus vannamei Boone. Three size groups of shrimp, i.e., the small size group [Gs, with an average body length （BL） of （3.04 ± 0.36） cm and body weight （BW）（0.412± 0.35） g], the large group [GL, with a BL of （4.29±0.55） cm and BW of （1.098 ±0.42） g], and the ungraded group [Gm, with a BL of （3.47±0.81） cm and BW of （0.611 ±0.79） g], were reared under the same conditions for 8 wk. Growth performance and non- specific immunity factors were measured. The results showed that BW gain, biomass gain and the specific growth rate of body length （SGRL） were significantly influenced by size grading （one-way ANOVA, P 〈 0.05）. The peroxidase （POD） and antibacterial （Ua） activities of GL were lower than those of G. Superoxide dismutase （SOD） and lysozyme （U1） activities of Gm were lower than those of G. No significant difference （P = 0.121 〉 0.05） was found on phenoloxidase （PO） activity among the three size groups. Synthetically, size grading could enhance growth and rearing efficiency, and did not have a significant influence on the immunity of L. vannamei Boone. Therefore, graded fanning in L. vannamei Boone was feasible in the culture practice.

关键词： Litopenaeus vannamei Boone graded farming growth non-specific immunity factor

Synthesis of Poly(isosorbide carbonate) via Melt Polycondensation Catalyzed by Ca/SBA-15 Solid Base

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Chinese Journal of Polymer Science 2018年第9期36卷 1027-1035页

作者： Xiao-Long Shen Zi-qing Wang qing-yin Wang Shao-ying Liu Gong-ying Wang Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China Changzhou Institute of Chemistry Changzhou 213164 China

Ca/SBA-15 solid bases with different Ca/Si atomic ratios were prepared by a one-pot route and employed as catalysts for the production of poly（isosorbide carbonate）（PIC） from diphenyl carbonate and isosorbide via a transesterification polymerization process. The relationship between physicochemical properties and catalytic performance for Ca/SBA-15 in this melt process was investigated by means of various characterization techniques. It was found that basic site amount and strength were responsible for this transesterification process; the weak and medium basic sites inclined to promote polycondensation reaction. It was worth noting that strong basic sites could favor the decomposition of the resultant P/C, resulting in the decrease of weight-average molecular weight （Mw） and yield, and the sample with Ca/Si atomic ratio of 0.4 exhibited the best catalytic performance, giving PIC with Mw of 4.88 × 10^4 g/mol and Tg of 169 ℃ at the optimal conditions. This excellent activity can be ascribed to the presence of rich basic sites and specific basic strength on the surface of 0.4Ca/SBA-15.

关键词： Ca/SBA-15 Poly(isosorbide carbonate) Diphenyl carbonate Transesterification Basic sites

De novo assembly of white poplar genome and genetic diversity of white poplar population in Irtysh River basin in China

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Science China(Life Sciences) 2019年第5期62卷 609-618页

作者： Yan-Jing Liu Xiao-Ru Wang qing-yin Zeng State Key Laboratory of Tree Genetics and Breeding Chinese Academy of Forestry State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of Sciences Department of Ecology and Environmental Science UPSCUmea University

The white poplar(Populus alba) is widely distributed in Central Asia and Europe. There are natural populations of white poplar in Irtysh River basin in China. It also can be cultivated and grown well in northern China. In this study, we sequenced the genome of P. alba by single-molecule real-time technology. De novo assembly of P. alba had a genome size of 415.99 Mb with a contig N50 of 1.18 Mb. A total of 32,963 protein-coding genes were identified. 45.16% of the genome was annotated as repetitive elements. Genome evolution analysis revealed that divergence between P. alba and Populus trichocarpa(black cottonwood)occurred ～5.0 Mya(3.0, 7.1). Fourfold synonymous third-codon transversion(4 DTV) and synonymous substitution rate(ks)distributions supported the occurrence of the salicoid WGD event(～ 65 Mya). Twelve natural populations of P. alba in the Irtysh River basin in China were sequenced to explore the genetic diversity. Average pooled heterozygosity value of P. alba populations was 0.170±0.014, which was lower than that in Italy(0.271±0.051) and Hungary(0.264±0.054). Tajima's D values showed a negative distribution, which might signify an excess of low frequency polymorphisms and a bottleneck with later expansion of *** populations examined.

关键词： Populus alba de novo assembly genetic diversity population expansion

Microstructure and properties of nano-TiN modified Ti(C,N)-based cermets fabricated by powder injection molding and die pressing

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1115-1121页

作者： Shan-jie Yi Hai-qing yin Ke Chen Dil-Faraz Khan qing-jun Zheng Xuan-hui Qu School of Materials Science and Engineering University of Science and Technology Beijing Department of Physics University of Science and Technology Bannu Kennametal Inc. 1600 Technology Way Latrobe

Powder injection molding （PIM） and die pressing were employed to fabricate nano-TiN modified Ti（C,N）- based cermets. The shrinkage behavior, microstructure, porosity, and mechanical properties of the samples with and without nano-TiN addition fabricated by PIM and die pressing were analyzed. It is demonstrated that for either PIM or die pressing, the porosities are obviously reduced, the mechanical properties are significantly improved after adding nano-TiN, and the hard particles are refined; the rim phase thickness obviously becomes thinner, and the number of dimples in fracture also increases. Compared the samples fabricated by die pressing, it is difficult for PIM to obtain dense Ti（C,N）-based cermets. Due to the too much existence of pores and isolated carbon, the mechanical properties of the sintered samples by PIM are inferior to those of the sintered ones by die pressing.

关键词： cermets powder injection molding die pressing titanium nitride nanoparticles mechanical properties

Effect of Mn doping on mechanical properties and electronic structure of WCoB ternary boride by first-principles calculations

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Chinese Physics B 2018年第10期27卷 537-547页

作者： Tong Zhang Hai-qing yin Cong Zhang Xuan-Hui Qu qing-Jun Zheng Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Materials Genome Initiative University of Science and Technology Beijing Beijing 100083 China Kennametal Inc 1600 Technology Way PA 15650 USA

The first-principles calculations are performed to investigate the structural, mechanical property, hardness, and electronic structure of WCoB with 0, 8.33, 16.67, 25, and 33.33 at.% Mn doping content and W_2 CoB_2 with 0, 10, and 20 at.%Mn doping content. The cohesive energy and formation energy indicate that all the structures can retain good structural stability. According to the calculated elastic constants, Mn is responsible for the increase of ductility and Poisson＇s ratio and the decrease of Young＇s modulus, shear modulus, and bulk modulus. By using the population analysis and mechanical properties, the hardness is characterized through using the five hardness models and is found to decrease with the Mn doping content increasing. The calculated electronic structure indicates that the formation of a B–Mn covalent bond and a W–Mn metallic bond contribute to the decreasing of the mechanical properties.

关键词： Mn doping WCoB electronic structure first-principles calculations

3D Ni(Ⅱ)/Cu(Ⅱ) Supermolecular Frameworks Based on Pyridylamine and Fumarate Co-ligands Containing a Trinodal (4,5,6)-Connected Network and a (H2O)16 Water Cluster

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Chinese Journal of Chemistry 2013年第2期31卷 256-262页

作者： Yifan Kang qing Liu Wenting yin Wentao Zhang Ping Liu Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education Key Laboratory of Physico-Inorganic Chemistry of Shaanxi College of Chemistry and Material Science Northwest University Xi' an Shaanxi 710069 China

Two new complexes, [Ni（dpypda）（H2O）3].（fum）（l） and [Cu2（dpypda）2（fum）2],-8nH2O （2）（dpypda = N2,N4-di（pyridin-2-yl）pyrimidine-2,4-diamine, fum=fumarate）, have been synthesized and characterized by single-crystal X-ray diffraction. Complex 1 is a discrete unit, exhibiting a （4,5,6）-connected framework formed by hydrogen bonding interactions and electrostatic interactions between flee rum dianions and mononuclear [Ni（dpypda）（H2O）3]2＋ cations. However, in complex 2, two crystallographically independent rum dianions adopt the alternative mode of mixed monodentate bridging and chelating and bis（monodentate） bridging Cu（II） atoms to produce a one-dimensional （ID） infinite zigzag chain. And there are unique （H2O）16 water clusters which consist of one cyclic （H2O）4 tetramer and two cyclic （H2O）5 pentamer with six dangling water molecules in its 3D su- pramolecular framework. Both 1 and 2 are characterized by IR and elemental analysis, and the TG properties were also investigated for 2.

关键词： pyridylamine ligand fumarate anions hydrogen bonding water clusters

Fe saponite, a layered silicate for reversible lithium-ions storage with large diffusion coefficient

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Journal of Energy Chemistry 2022年第4期31卷 92-100页

作者： Jian Zhang qing yin Yunjia Wu Shuoxiao Zhang Kai-Jie Wang Jingbin Han State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Tongren Eye Center Beijing Tongren HospitalBeijing Ophthalmology&Visual Sciences Key LabCapital Medical UniversityBeijing 100730China

A kind of layered Li;MSiO;material,Fe saponite with Na;pillaring (Na^(+)-FSAP) was developed as a lowcost and environment-friendly lithium-ion storage *** Na^(+)-FSAP follows the insertion/deinsertion working mechanism accompanied by valence change of Fe from Fe^(1.86+) to Fe^(2.71+) (average value) after stabilization,and displays a specific capacity of 125 m Ah g^(-1) at 50 m A g^(-1) with retention ratio of 80.8%after 75 *** Na^(+)-pillaring effect and abundant structural water in the gallery urge Li^(+) migrate rapidly,resulting in a large Li^(+) diffusion coefficient within a range of 10^(-6.5)–10^(-7.5) cm^(2)s^(-1).Thus,the Na^(+)-FSAP provides a model material to design electrode materials with rapid lithium-ion migration and has great potential to take place of polyanionic-type Li_(2)MSiO_(4)(M=Mn,Fe,Co) cathode materials.

关键词： Fe saponite Clay minerals Layered silicates Lithium-ion storage