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Simultaneous enhancement of mechanical and ablation properties of c/c composites modified by (Hf-Ta-Zr)c solid solution ceramics

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JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2023年第8期43卷 3182-3190页

作者： Miao, Qing Fu, Yanqin chen, Hui Zhang, Jianhua Zhao, Junhao Zhang, Yulei Northwestern Polytech Univ Carbon Carbon Composites Res Ctr State Key Lab Solidificat Proc Xian 710072 Peoples R China Henan Acad Sci Carbon Matrix Composites Res Inst Henan Key Lab High Performance Carbon Fiber Reinfo Zhengzhou 450046 Peoples R China

In order to improve the mechanical and ablative resistance of c/c composites, (Hf-Ta-Zr)c single-phase solid solution ceramics were introduced into c/c composites by polymer infiltration and pyrolysis (PIP) to fabricate (Hf-Ta-Zr)c modified c/c composites (HTZ). Their mechanical property and ablation resistance were studied. The results showed that HTZ achieved simultaneous enhancement of mechanical property and ablative resis-tance. Their flexural strength and modulus could reach 219.34 MPa and 24.82 GPa, respectively. In addition, the mass and linear ablation rate of HTZ were 0.379 mg/s and 0.667 mu m/s, respectively after the 90 s oxyacetylene ablation. A dense Hf-Ta-Zr-O multiphase oxide layer was formed on the surface of the HTZ during ablation process, which protected the interior modified c/c composites from ablation. Our work expands a rational design of modified c/c composites and broaden the application of solid solution ceramic in the field of ultra-high temperature ablation resistance for carbon or ceramic-based composites.

关键词： (Hf-Ta-Zr)c solid solution ceramics Polymer infiltration and pyrolysis c c composites Mechanical property Ablation resistance

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Expression of structural proteins of hepatitis c virus (HcV) in mammalian cells

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Science china(Life Sciences) 1998年第1期41卷 47-55页

作者：李迎春李光地孔玉英汪垣王宇闻玉梅 1. Shanghai Institute of Biochemistry Chinese Academy of Sciences 200031 Shanghai China 2. Institute of Liver Disease Beijing Medical University 100044 Beijing China 3. Laboratory of Medical Molecular Virology Ministry of Public Health Shanghai Medical University 200031 Shanghai China

The vaccinia viral vector containing T7 promoter was used to construct the expression plasmids carrying HcV structural genes of c, E1 and E2/NS1. These genes were transiently expressed in mammalian cells in the presence of the T7 RNA polymerase which was provided by the recombinant vaccinia virus vTT7. Expression of mature core protein, envelope protein E1 and E2 was detected by Western blot using HcV patient sera as the primary antibodies. It was found that the sera from different HcV patients reacted differently with the expressed products, so did the sera collected at different times from the same patient, from whom the HcV structural genes were isolated. Among six mammalian cell lines, Vero and HeLa were the most suitable for the expression of c, E1 and E2. The recombinant vaccinia viruses have been constructed to constantly produce the c, E1 and E2 proteins for further research.

关键词： hepatitis c virus core protein envelope protein recombinant vaccinia virus transient expression immunoblotting.

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Effect of h-BN addition on thermo-physical properties and phonon mechanisms of c/c-BN composites

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cARBON 2023年 204卷 346-356页

作者： Niu, Zi-bo Xiao, Peng Zhang, Bengu Li, Zhuan chen, Fu chen, Pengju Li, Yang Cent South Univ Natl Key Lab Sci & Technol High Strength Struct Ma Changsha 410083 Peoples R China Cent South Univ Powder Met Res Inst Changsha 410083 Peoples R China

c/c-BN composites containing different contents of h-BN particles were prepared by chemical vapor infiltration (cVI), presenting different microstructures and pyrolytic carbon (Pyc) textures. The effects of different micro-structures and Pyc textures on the thermo-physical properties and their phonon mechanisms at 30-900 degrees c were investigated. The temperature dependence of heat capacity follows Debye's phonon theory, especially in the low -temperature section (30-300 degrees c) and the temperature dependence of thermal conductivity is determined by heat capacity and mean free length of phonon. Due to the higher texture of h-BN and regenerative laminar Pyc (ReL-Pyc), h-BN addition causes higher Debye temperature (Theta D) and high sensitivity of thermal conductivity to temperature. Besides, h-BN addition significantly changes the microstructure of composites such as pore struc-ture, Pyc morphology, crack distribution and fiber/Pyc interface bonding state, causing the transformation of thermal conductivity from anisotropy to isotropy. Finally, based on the different microstructures of composites, the microstructure model and thermal resistance formulas of composites were established and coincident with the experimental results.

关键词： c c composite Heat capacity Thermal conductivity Phonon mechanisms

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One-dimensional recoverable ZnFe2O4/c/MnO2/BiOI magnetic composite with enhanced photocatalytic performance for organic dyes degradation

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ENVIRONMENTAL ScIENcE AND POLLUTION RESEARcH 2022年第42期29卷 63233-63247页

作者： Ma, Mingliang chen, Yan Jiang, Jiabin Bi, Yuxin Liao, Zijian Ma, Yong Qingdao Univ Technol Sch Civil Engn Qingdao 266033 Peoples R China Shandong Univ Sci & Technol Sch Mat Sci & Engn Qingdao 266590 Peoples R China

Excessive discharge of toxic dyes is detrimental to ecological system and human health. Therefore, an effective photocatalyst must be designed and developed to degrade dyes from wastewater. Herein, a novel one-dimensional (1D) flower-like recoverable ZnFe2O4/c/MnO2/BiOI magnetic composite photocatalyst was synthesized via electrospinning technique combined with hydrothermal method. The photocatalytic activities of composite photocatalyst were evaluated by degrading methyl orange (MO) and Rhodamine B (RhB) under simulated light irradiation. The efficiency of ZnFe2O4/c/MnO2/BiOI photocatalyst in visible light for 150 min reached 91% (MO) and 120 min reached 94% (RhB). Moreover, the degradation rate of MO still remained 78% after five cycles. The design of 1D magnetic flower-like composite provided a new strategy for preparing photocatalysts possessing excellent photocatalytic efficiency and cyclic stability.

关键词： ZnFe2O4 c MnO2 BiOI Magnetic composite photocatalyst 1D structure Flower-like cyclic stability

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One-step combustion synthesis of c/MgO composite powders with MgO nanofibers

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cERAMIcS INTERNATIONAL 2021年第10期47卷 13704-13714页

作者： Li, Kaidi Xiao, Guoqing Ding, Donghai chong, Xiaochuan Luo, Jiyuan chen, Xing Bai, Bing Ren, Yun Xian Univ Architecture & Technol Coll Mat Sci & Engn Xian 710055 Peoples R China

c/MgO composite powders were prepared by combustion synthesis using magnesium oxalate and magnesium powders as raw materials. The phase composition and microstructure of the composite powders were investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy/energy dispersive spectroscopy (FESEM/EDS), high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. The synthetic mechanism was explored through TG-FTIR and combustion front quenching techniques. It was found that the c/MgO composite powders contained a large quantity of MgO nanofibers. When the molar ratio of magnesium oxalate and magnesium was 1:4, the carbon content of the product reached a maximum of 9.45 wt %. In the composite powders, cubic MgO particles were encapsulated by a thin carbon layer, and there was a tiny gap between MgO and the carbon layer;a large number of MgO nanofibers with aspect ratios of 80?100 were found. The cubic MgO particles of the products are the direct decomposition of Mgc2O4, and the MgO nanofibers are the reaction product of gaseous Mg and cO2/cO at high temperature. Meanwhile, the carbon deposited on the MgO particles can inhibit the grain growth of MgO particles and result in the refinement of MgO particles. The uniform dispersion of carbon and the weak c/MgO interface combine, making the composite powders a potential additive for low-carbon MgO?c refractories with excellent thermal shock resistance.

关键词： combustion synthesis c MgO composite Powders MgO nanofibers

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characterization and modeling of tensile properties of continuous fiber reinforced c/c-Sic composite at high temperatures

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JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2021年第5期41卷 3061-3071页

作者： Shi, Yuan Kessel, Fiona Friess, Martin Jain, Neraj Tushtev, Kamen German Aerosp Ctr Stuttgart Inst Struct & Design Pfaffenwaldring 38-40 D-70569 Stuttgart Germany Univ Bremen Adv Ceram Biol Garten 2 D-28359 Bremen Germany

In order to study the effects of temperature on the material behavior of Liquid Silicon Infiltration (LSI) based continuous carbon fiber reinforced silicon carbide (c/c-Sic), the mechanical properties at room temperature (RT) in in-plane and out-of-plane directions are summarized and the tensile properties of c/c-Sic were then determined at high temperature (HT) 1200 degrees c and 1400 degrees c under quasi static and compliance loading. The stressstrain response of both HT tests is similar and almost no permanent strain can be observed compared to the RT, which can be explained through the relaxation of residual thermal stresses and the crack distribution under various states. The different fracture mechanisms are confirmed by the analysis of fracture surface. Furthermore, based on the analysis of hysteresis measurements at RT, a modeling approach for the prediction of material behavior at HT has been developed and a good agreement between test and modeling results can be observed.

关键词： c c-Sic Mechanical properties High temperature Hysteresis measurement Liquid silicon infiltration (LSI)

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cONcURRENT-c - A PROGRAMMING LANGUAGE FOR DISTRIBUTED MULTIPROcESSOR SYSTEMS

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SOFTWARE-PRAcTIcE & EXPERIENcE 1984年第11期14卷 1061-1078页

作者： TSUJINO, Y ANDO, M ARAKI, T TOKURA, N Department of Information and Computer Sciences Faculty of Engineering Science Osaka University Toyonaka Osaka 560 Japan

AbstractRecent advances in hardware technology have made the construction of multiprocessor systems economically feasible. This paper describes a new programming language (concurrent c) suitable for distributed systems which are networks of loosely connected processors, each with its own local storage. concurrent c is the extended version of the programming language c, incorporating features for parallel processing and interprocess communications.

关键词： c Distributed multiprocessor systems System programming concurrent facility interprocess communication

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Effects of c, Nb and c+Nb combined ion implantation on the oxidation resistance of γ-TiAl based alloy

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MATERIALS ScIENcE AND ENGINEERING A-STRUcTURAL MATERIALS PROPERTIES MIcROSTRUcTURE AND PROcESSING 2001年第1-2期316卷 224-230页

作者： Li, XY Taniguchi, S Zhu, Yc Fujita, K Iwamoto, N Matsunaga, Y Nakagawa, K Ion Engn Res Inst Corp Hirakata Osaka 5730128 Japan Osaka Univ Grad Sch Engn Dept Mat Sci & Proc Suita Osaka 5650871 Japan Ishikawajima Harima Heavy Ind Co Ltd Koto Ku Tokyo 1358732 Japan

The isothermal oxidation behavior of Ti-48Al-1.3Fe-1.1V-0.3B (at.%) implanted with c, Nb or c + Nb was investigated at 1173 K for 349.2 ks in air. Dose was 3.0 x 10(21) ions per m(2) and the acceleration voltage was 50 kV for each element. The purpose of this study is to improve the high-temperature oxidation resistance of the alloy by suitable implantation process and clarify the effects of c, Nb and their interaction on the formation of the oxide scale. Thermobalance, auger electron spectroscopy (AES) and scanning electron microscopy (SEM) were used to characterize the oxidation behavior and the scale structure, It was found that the c implantation is harmful to the long-term oxidation resistance, the Nb implantation significantly decreases the oxidation rate, and the c + Nb implantation can further improve the beneficial effect of the Nb implanted alloy and thus gives the best oxidation resistance. It was also found that for the c implantation, the c rich layer can act as a barrier to the inward diffusion of O in the early stage of the oxidation, but this effect will disappear after oxidation for about 3.6 ks due to the fast consumption of c. The presence of Nb can promote the formation of an Al enriched layer in the external scale. The co-existence of Nb and c would enhance their respective stability remained in the external scale or substrate with high peak concentration and thus prolong and intensify their respective beneficial effects. The significant improvement of the oxidation resistance of the c + Nb combined implantation is attributed to the above respective c and Nb beneficial effect and their interaction during the oxidation. (c) 2001 Elsevier Science B.V. All rights reserved.

关键词： oxidation c TiAl ion implantation high temperature Nb

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characterization on fatigue behavior and damage mechanism of c/BMI composites experienced thermal cycling

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JOURNAL OF cOMPOSITE MATERIALS 2023年第18期57卷 2829-2842页

作者： Gao, Tiejun Gao, Bowen Gao, Yu Wang, Baichen Dong, Shangli Shenyang Aerosp Univ Fac Aerosp Engn Shenyang Peoples R China Shenyang Aerosp Univ Sch Mat Sci & Engn Shenyang Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin Peoples R China

The multi-directional laminate ccF800H/Ac631 bismaleimide composite material was exposed for a long time under the thermal-cycling environment (-60 degrees c similar to+180 degrees c), and the mass loss rate, FTIR spectra, DMA, tensile strength were tested. The fatigue stress level was determined according to the tensile strength and the fatigue performance of the before and after the thermal-cycling environment was tested. Macroscopic visual inspection and ultrasonic c-scan were used to characterize and analyze the fatigue damage of composite materials. The results show that with the increase in the number of thermal cycles, the mass loss of the composite material started with increased rapidly and then basically flat. The c/BMI composites underwent obvious thermal oxygen aging. After thermal-cycling, it would lead to changes in dynamic mechanical properties by a certain degree of post-curing, physical aging, and local interface debonding in composite materials. With the thermal cycles increased the composite material tensile strength first increased slightly and then decreased rapidly. After 300 thermal cycles, the composite materials occurred slightly damaged, and the fatigue life was apparently reduced compared with the original state. The fatigue failure modes of composite materials are mainly fiber fracture and multi-directional laminate delamination. At high stress levels, the stiffness of the specimen after thermal-cycling are lower decrease compared with original specimens, more stress levels would lead to more II stage rate of stiffness decline, and stiffness degradation curve and hysteretic energy recovery curve had enough effect to characterize damage effect of material environment induced by thermal-cycling environment factors.

关键词： Thermal-cycling c BMI composites dynamic mechanical analysis (DMAs) fatigue behavior stiffness degradation damage mechanisms

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c∀: Adding modern programming language features to c

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SOFTWARE-PRAcTIcE & EXPERIENcE 2018年第12期48卷 2111-2146页

作者： Moss, Aaron Schluntz, Robert Buhr, Peter A. Univ Waterloo Cheriton Sch Comp Sci 200 Univ Ave West Waterloo ON N2L 3G1 Canada

The c programming language is a foundational technology for modern computing with millions of lines of code implementing everything from hobby projects to commercial operating systems. This installation base and the programmers producing it represent a massive software engineering investment spanning decades and likely to continue for decades more. Nevertheless, c, which was first standardized almost 30 years ago, lacks many features that make programming in more modern languages safer and more productive. The goal of the c for all project (pronounced "c for all") is to create an extension of c that provides modern safety and productivity features while still ensuring strong backward compatibility with c and its programmers. Prior projects have attempted similar goals but failed to honor the c programming style;for instance, adding object-oriented or functional programming with garbage collection is a nonstarter for many c developers. Specifically, c for all is designed to have an orthogonal feature set based closely on the c programming paradigm, so that c for all features can be added incrementally to existing c code bases, and c programmers can learn c for all extensions on an as-needed basis, preserving investment in existing code and programmers. This paper presents a quick tour of c for all features, showing how their design avoids shortcomings of similar features in c and other c-like languages. Experimental results are presented to validate several of the new features.

关键词： c cforall generic types polymorphic functions tuple types variadic types

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