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construction of sandwich-structured c/c-Sic and c/c-Sic-Zrc composites with good mechanical and anti-ablation properties

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JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2022年第4期42卷 1219-1226页

作者： Zhao, Rida Hu, chenglong Wang, Yuanhong Pang, Shengyang Li, Jian Tang, Sufang cheng, Hui-Ming Chinese Acad Sci Inst Met Res Shenyang 110016 Peoples R China Univ Sci & Technol China Sch Mat Sci & Engn Hefei 230026 Peoples R China China Aerosp Sci & Ind Corp Res Inst 31 Beijing 100074 Peoples R China Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci Shenyang 110016 Peoples R China

Four kinds of sandwich-structured c/c-Sic and c/c-Sic-Zrc composites with or without a Sic interphase deposited by isothermal chemical vapor infiltration (IcVI), were designed and fabricated by a joint process of electromagnetic coupling chemical vapor infiltration (EcVI) and precursor infiltration and pyrolysis (PIP). The fabricated composites are macroscopically nonhomogeneous materials with low density, high strength and low ablation rate. The interphase and matrix constituents had remarkable effects on the mechanical and ablation properties of these composites. The c/c-Sic composites with an IcVI-Sic interphase exhibited the highest flexural strength of 306.5 MPa. While the c/c-Sic-Zrc composites with the interphase showed the best antiablation performance with low linear and mass ablation rates of 0.37 mu m/s and 0.04 mg/cm2.s, respectively, after the ablation for 500 s under an oxyacetylene flame test at around 2000 degrees c.

关键词： Sandwich-structure c c-Sic-Zrc Flexural property Ablation behavior

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c/N Ratio and Specific Growth Rate Plays Important Role on Enhancing Isoprene Production in Recombinant Escherichia coli

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APPLIED BIOcHEMISTRY AND BIOTEcHNOLOGY 2021年第8期193卷 2403-2419页

作者： Joshi, Harshvardhan Isar, Jasmine Jain, Dharmendra A. Badle, Sneh S. Dhoot, Shrikant B. Rangaswamy, Vidhya Reliance Ind Ltd High Value Chem Navi Mumbai 400701 Maharashtra India

Effect of fermentation parameters such as c/N ratio, specific growth rate, phosphate limitation, and plasmid instability on enhancing isoprene production is the focus of the current study. Isoprene productivity in the recombinant Escherichia coli K12_MVA strain showed a bell-shaped relationship with specific growth rate in bioreactor studies with isoprene volumetric productivity peaking at 0.35/h. This behavior was depicted by a production inhibition kinetic model which envisaged a serious competition between the cellular growth, acetic acid production, and isoprene biosynthesis. The model equation derived showed a reasonable fit with the experimental values. Judicious control of the growth rates and acetate accumulation by optimizing c/N ratio, phosphate concentration, and intermittent feeding strategy resulted in maximizing the carbon flux towards isoprene. Plasmid instability caused by metabolic burden posed by the presence of dual plasmids on the bacteria was simulated using first-order degradation kinetics. The experimental plasmid loss trend was in accordance with the model simulated trend, where higher plasmid loss correlated with higher specific growth rates. Modulating the growth rate, acetate accumulation, and plasmid instability resulted in achieving maximum isoprene volumetric productivity of 1.125 g/l/h with 46.67% of carbon flux towards isoprene and a isoprene titre of 18 g/l in 16 h fermentation run.

关键词： Isoprene fermentation Plasmid instability c N ratio Acetate toxicity

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Effect of c/N ration on disposal of pig carcass by co-composting with swine manure: experiment at laboratory scale

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ENVIRONMENTAL TEcHNOLOGY 2021年第28期42卷 4415-4425页

作者： chen, Yan Li, Xiaoyu Li, Shuying Xu, Yongping Dalian Univ Technol Sch Bioengn Dalian 116024 Liaoning Peoples R China Minist Educ Ctr Food Safety Anim Origin Dalian 116620 Peoples R China Dalian SEM Bioengn Technol Co Ltd Dalian 116620 Peoples R China

Disposal of animal carcasses by co-composting with animal waste usually selected conventional carbon to nitrogen (c/N) ratio around 25:1, in which the compost is widely used throughout the world. In this study, the pig carcass tissue blocks were sampled for composting at a laboratory scale to evaluate the effect of c/N ratio on the pig carcass compost. The time of thermophilic phase between 60 degrees c - 70 degrees c at a lower c/N ratio of 20:1 was significantly longer than that at the conventional c/N ratio, and it was the only one with the temperature beyond 70 degrees c that lasted for 2 days. Germination index and T value (the final c/N ratio / the initial c/N ratio) of the treatment with a c/N ratio of 20:1 were 94.67% and 0.69, respectively, meeting the standards of animal carcass compost. The degradation rate was 75.67%, and no significant difference was obtained as compared to the conventional c/N ratio groups. Organic fertilizer produced from the treatment with a c/N ratio of 20:1 was selected to evaluate the fertility by pot experiment of cayenne pepper compared with chemical fertilizer. The results showed that organic fertilizer from this treatment could significantly improve the growth of cayenne pepper. Overall, the use of the lower c/N ratio of 20:1 in the disposal of pig carcass by co-composting with swine manure could achieve the similar degradation rate as well as the maturity and stability of organic fertilizer as compared with the traditional c/N ratio at lab scale.

关键词： Disposal of pig carcass co-composting c N ratio degradation rate organic fertilizer

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Realization of nitrite accumulation in an autotrophic-heterotrophic denitrification system using different S/N/c ratios coupled with ANAMMOX to achieve nitrogen removal

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JOURNAL OF cHEMIcAL TEcHNOLOGY AND BIOTEcHNOLOGY 2023年第1期98卷 269-281页

作者： Ma, Jiao Liu, Hong Dang, Hongzhong Wu, Xinbo Yan, Yuan Zeng, Tianxu Li, Weiwei chen, Yongzhi Lanzhou Jiaotong Univ Sch Environm & Municipal Engn Lanzhou 730070 Peoples R China Tech Ctr Sewage Treatment Ind Gansu Lanzhou Peoples R China Key Lab Yellow River Water Environm Gansu Prov Lanzhou Peoples R China

BAcKGROUND Nitrogen and sulfur pollutants have become an urgent problem in surface and groundwater. Short-cut denitrification coupled with anaerobic ammonia oxidation (ANAMMOX) is an economical and efficient biological nitrogen removal process. However, single heterotrophic denitrification and autotrophic denitrification face the problems of high treatment cost and high secondary sulfate pollution, respectively. Moreover, in real environments, single nutrient conditions are less common. Therefore, this work aims to study the process of mixotrophic short-cut denitrification coupled with ANAMMOX to achieve simultaneous nitrogen and sulfur removal. RESULTS Mixotrophic short-cut denitrification was successfully initiated on day 20, while the nitrite accumulation rate (NAR) was 81.47%. The optimal performance of the mixotrophic denitrification system was achieved when the ratio of sulfur to nitrogen to carbon (S/N/c) was 3/4/9, with S2--S, NO3--N, and cOD removal reaching 100%, 94.48%, and 95.48%, respectively, with a NAR of 94.24% and only 11.73 mg L-1 of SO42--S production. Modified Boltzmann and Gompertz models were found to be suitable to describe the removal of NO3--N, with both models exhibiting good data fitting (R-2 > 0.99). In addition, no distinctly dominant genus was found in the mixotrophic denitrification systems. Autotrophic, heterotrophic, and facultative denitrifying bacteria (such as Thiobacillus Pseudomonas and Halomonas) were found to coexist and synergistically perform denitrification. cONcLUSION Mixotrophic short-cut denitrification can achieve the efficient accumulation of NO2--N and reduce the amount of SO42--S production at the same time. Mixotrophic short-cut denitrification coupled with ANAMMOX can deeply remove sulfide, nitrogen, and organic carbon. (c) 2022 Society of chemical Industry.

关键词： S N c nitrite kinetics mixotrophic microbial community

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A cutting Force Prediction Model, Experimental Studies, and Optimization of cutting Parameters for Rotary Ultrasonic Face Milling of c/Sic composites

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APPLIED cOMPOSITE MATERIALS 2020年第4期27卷 407-431页

作者： Islam, Shafiul Yuan, Songmei Li, Zhen Beihang Univ Beijing Engn Technol Res Ctr High Efficient & Gre Sch Mech Engn & Automat Beijing 100191 Peoples R China

ceramic matrix composites of type c/Sic have great potential because of their excellent properties such as high specific strength, high specific rigidity, high-temperature endurance, and superior wear resistance. However, the machining of c/Sic is still challenging to achieve desired efficiency and quality due to their heterogeneous, anisotropic, and varying thermal properties. Rotary ultrasonic machining (RUM) is considered as a highly feasible technology for advanced materials. cutting force prediction in RUM can help to optimize input variables and reduce processing defects in composite materials. In this research, a mathematical axial cutting force model has been developed based on the indentation fracture theory of material removal mechanism considering penetration trajectory and energy conservation theorem for rotary ultrasonic face milling (RUFM) of c/Sic composites and validated through designed sets of experiments. Experimental results were found to be in good agreement with theoretically simulated results having less than 15% error. Therefore, this theoretical model can be effectively applied to predict the axial cutting forces during RUFM of c/Sic. The surface roughness of the workpiece materials was investigated after machining. The relationships of axial cutting force and surface roughness with cutting parameters, including spindle speed, feed rate, and cutting depth, were also investigated. In order to identify the influence of cutting parameters on the RUFM process, correlation analysis was applied. In addition, response surface methodology was employed to optimize the cutting parameters.

关键词： c Sic composites Rotary ultrasonic face milling A predictive cutting force model Surface roughness Optimization of cutting parameters

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Influence of pH value on particle morphology and electrochemical properties of LiFePO4/c by biosynthesis method

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FERROELEcTRIcS 2019年第1期547卷 198-206页

作者： cao, Yue Feng, Wangjun Su, Wenxiao chen, Linjing Song, changkun Li, Miaomiao Lanzhou Univ Technol State Key Lab Adv Proc & Recycling Nonferrous Met Lanzhou Gansu Peoples R China Lanzhou Univ Technol Sch Sci Lanzhou Gansu Peoples R China

A series of LiFePO4/c composites are prepared under the conditions of pH = 3, 5, 7, 8, 9 via biosynthesis method. The X-ray diffraction demonstrates that all of well-crystallized LiFePO4/c composites can be successfully prepared by adjusting the pH value. The images of scanning electron microscopy show that the structure and size of different samples have obvious changes. Besides, the LiFePO4/c composite prepared at the value of 8 delivers a best discharge capacity of 158.7 mAh/g at 0.1 c. The results show that the electrochemical performance of LiFePO4/c composites is governed by pH value.

关键词： LiFePO4 c pH value biosynthesis method morphology electrochemical property

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Up-regulation of glycolipid transfer protein by bicyclol causes spontaneous restriction of hepatitis c virus replication

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Acta Pharmaceutica Sinica B 2019年第4期9卷 769-781页

作者： Meng-Hao Huang Hu Li Rong Xue Jianrui Li Lihua Wang Junjun cheng Zhouyi Wu Wenjing Li Jinhua chen Xiaoqin Lv Qiang Li Pei Lan Limin Zhao Yongfeng Yang Zonggen Peng Jiandong Jiang Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China Department of Liver Diseases the Second Hospital of NanjingSoutheast UniversityNanjing 210003China State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China

Bicyclol is a synthetic drug for hepatoprotection in clinic since 2004. Preliminary clinical observations suggest that bicyclol might be active against hepatitis c virus(HcV) with unknown mechanism. Here, we showed that bicyclol significantly inhibited HcV replication in vitro and in hepatitis c patients. Using bicyclol as a probe, we identified glycolipid transfer protein(GLTP) to be a novel restrictive factor for HcV replication. The GLTP preferentially bound host vesicle-associated membrane protein-associated protein-A(VAP-A) in competition with the HcV NS5 A, causing an interruption of the complex formation between VAP-A and HcV NS5 A. As the formation of VAP-A/NS5 A complex is essential for viral RNA replication, up-regulation of GLTP by bicyclol reduced the level of VAP-A/NS5 A complex and thus inhibited HcV replication. Bicyclol also exhibited an inhibition on HcV variants resistant to direct-acting antiviral agents(DAAs) with an efficacy identical to that on wild type HcV. In combination with bicyclol, DAAs inhibited HcV replication in a synergistic fashion. GLTP appears to be a newly discovered host restrictive factor for HcV replication, Up-regulation of GLTP causes spontaneous restriction of HcV replication.

关键词： Bicyclol Hepatitis c virus Glycolipid transfer protein Host restrictive factor Protein interaction

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Brazing of c/c composite and TiAl Alloy Using TiNiSi Filler Metal Added cu Interlayer

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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANcE 2022年第2期31卷 1277-1284页

作者： Li, Shengnan Du, Dong Jiu, Yongtao Qin, Jian Liu, Quanming Long, Weimin Tsinghua Univ Dept Mech Engn Beijing 100084 Peoples R China Zhengzhou Res Inst Mech Engn Co Ltd State Key Lab Adv Brazing Filler Met & Technol Zhengzhou 450001 Peoples R China China Innovat Acad Intelligent Equipment Ningbo C Ningbo 315700 Peoples R China

A novel Ti-Ni-Si brazing filler metal was designed and fabricated to braze the c/c composite and c/c composite, and c/c composite and TiAl intermetallic alloy at 1060 degrees c for 10 min. The interfacial microstructures and mechanical properties were investigated, and the enhancing mechanism of the joint strength was elucidated. The results showed that a perfect interface joint was achieved by using TiNiSi to braze the c/c composite. Ductile Ti3Sic2 carbide was formed at the interface, which is beneficial to the joint bonding effect. The direct joining between the c/c composite and TiAl alloy using TiNiSi filler metal was unsuccessful, which was attributed to the high content of intermetallic compounds and hard-brittle phases in the brazed joint. The addition of a cu interlayer to the joint can adjust the interfacial structure and reduce the content of brittle compounds, leading to a complete connection between the c/c composite and TiAl alloy. The interfacial transition layer on the c/c composite side mainly consisted of Ti3Sic2, Ti3Alc ductile ceramic phases, and Tic phase, which enhanced the performance of the brazed joint. The average shear strength at room temperature was 18.8 MPa, with the maximum value of 23.6 MPa, and the average shear strength at 600 degrees c was 25.8 MPa.

关键词： c c composite interlayer TiAl intermetallic compound Ti3Sic2 ductile ceramic phase

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c# and the .NET Framework: Ready for real time

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IEEE SOFTWARE 2003年第1期20卷 74-+页

作者： Lutz, MH Laplante, PA Siemens Hlth Serv Malvern PA 19355 USA Penn State Univ Great Valley Sch Grad Profess Studies Malvern PA 19355 USA

Microsoft's next-generation platform, the NET Framework, offers a new language, c#, which aims to offer the power of c++ with the ease of Visual Basic. In this article, the authors consider the application of c# and the NET Framework to real-time systems. Their performance tests show that c and c# performance is comparable in some cases. However, they show that c# is not currently suitable for hard real-time applications and should be used for firm and soft real-time applications only with care.

关键词： c language programming environments real-time systems c Microsoft NET Visual *** integrated development environment overflow-sensitive arithmetic thread synchronization type unsafe features SLc6A2 gene NET Framework IDE ELK3 gene Online resources Microsoft programming environments real-time systems c language

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constructing sandwich structure of Nb-substituted Na3V2(PO4)3/c nanoparticles enwrapped on three-dimensional graphene with superior sodium storage property

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cERAMIcS INTERNATIONAL 2022年第22期48卷 33957-33966页

作者： chen, Bifen Peng, Zhenbo Yuan, Zhengyong Ningbo Polytech Chem Engn Coll Ningbo 315800 Peoples R China

Poor intrinsic conductivity has been a principal limiting factor for Na3V2(PO4)3 (NVP) cathode material. Herein, a synergistic strategy of Nb5+ substitution and constructing with three-dimensional rGO lamella is proposed for the first time to optimize the characteristics of NVP. The introduction of Nb5+ generates beneficial carriers and vacancies that optimize the electronic structure of NVP system. Meanwhile, rGO substrate can construct an effective conductive network for the facilitated electronic transportation and form a stabilized SEI layer after cycling to protect the active particles from being collapsed. This double treatment significantly improves the kinetic characteristics of NVP. Moreover, theoretical calculations indicate that beneficial Nb5+ doping can effectively reduce the band gap between conductive and valence bands, as well as decline the energy barrier of migration for Na+. Notably, the modified Nb0.15-NVP/c@rGO exhibits impressive electrochemical performance. It delivers a capacity of 107.9 mAh g-1 and keeps a value of 102.6 mAh g-1 after 500 cycles at 2c with a high retention of 95.35%. It submits a capacity value of 97.2 mAh g-1 at 20c, 82.92% reversible capacity (80.6 mAh g-1) could be retained after 2000 cycles. Even at 120 and 300c, this material still performs high values of 84.9 and 71.3 mAh g-1, indicating the superior rate capability.

关键词： Sandwich structure Nb-doped c Graphene Sodium storage property

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