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Frictional performance of silicon carbide under different lubrication conditions

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Friction 2014年第1期2卷 58-63页

作者： xingyu zhao Ying LIU Qingfeng WEN Yuming WANG State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

The frictional performance of materials used in face seals is critical to the sealing *** carbide is commonly used in hard rings because of its abrasion resistance,corrosion resistance,and thermal shock *** this study,the frictional performance of silicon carbide,including graphite-added silicon carbide,under water and lubrication-absent conditions was studied by using a Falex-1506 tribotester and different working *** addition,the morphology of the worn surfaces was observed using scanning electron microscopy and the damage was characterized to understand the tribological behavior of different silicon *** results suggest that the friction coefficients decrease with increasing pressure under water lubrication conditions because of the water within the holes on the surface of the *** percentage of water lubrication increases,whereas the percentage of solid friction decreases when the pressure *** dry contact conditions,the friction coefficients change negligibly with increasing pressure and graphite-added silicon carbide shows better frictional performance.

关键词： Silicon carbide frictional performance water,lubrication wear mechanism

A study of function mechanism of hemxamethyl tetra-amine in gelation process of uranium

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Rare Metals 2006年第Z1期25卷 343-346页

作者： GUO Wenli LIANG Tongxiang zhao xingyu HAO Shaochang FU Xiaoming Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

The UO2 ceramic microspheres are the most important materials in the spherical fuel elements for high temperature reactor (HTR). A process for preparation of UO2 kernels known as total gelation process of uranium (TGU) was developed as the production process of 10 mW HTR at Tsinghua University. The TGU process is based on the traditional sol-gel process, external gelation process and internal gelation process of uranium (EGU and IGU), which implies that the gelation action is initiated both by ammonia out of the gel particles and hemxamethyl tetra-amine (HMTA) inside the gel particles. The gelation behavior and the properties of uranium microspheres were investigated of the solution with and without HMTA. It is observed that good spherical particles can be obtained without HMTA in the sol, which indicates a more controllable and industrialized route will be set up. Contrasts between this route and the traditional EGU were also listed.

关键词： gelation process of uranium high temperature reactor (HTR) UO2 microsphere

Preparing UO_2 kernels by gelcasting

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Nuclear Science and Techniques 2009年第2期20卷 124-128页

作者： GUO Wenli LIANG Tongxiang zhao xingyu HAO Shaochang LI Chengliang Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

A process named gel-casting has been developed for the production of dense UO2 kernels for the high-temperature gas-cooled *** with the sol-gel process,the green microspheres can be got by dispersing the U3O8 slurry in gelcasting process,which means that gelcasting is a more facilitative process with less waste in fabricating UO2 *** UO2 kernels with the size of 500 μm,O/U≤2.01,density of 10.70 g·cm-3 were obtained by gel-casting process followed by heat treatment.

关键词：凝胶注模成型内核高温气冷实验堆铀成型过程溶胶凝胶法 U3O8 高密度

Ni_(3)B modified BiVO_(4) photoanodes for enhanced photoelectrochemical water splitting:The key role of Ni_(3)B on reducing the water oxidation barrier

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Nano Research 2023年第10期16卷 12043-12049页

作者： Kehui Xue Haifeng Zhu xingyu zhao Liana Alvares Rodrigues D.Amaranatha Reddy Yaping Zhang Lianqing Yu School of Materials Science and Engineering China University of Petroleum(East China)QingDao 266580China College of Science China University of Petroleum(East China)QingDao 266580China Engineering School of Lorena University of São PauloCEP 12602-810São PauloBrazil Indian Institute of Information Technology Design and Manufacturing Kurnool 518007India

Bismuth vanadate(BiVO_(4),BVO)as a promising photoelectrode has been received great attention for photoelectrochemical(PEC)water ***,the slow oxidation kinetics on the surface of BiVO_(4)limited the PEC water splitting ***,nickel boride(Ni_(3)B,NB)nanoparticles,generally used in electrocatalytic field material,were modified on the surface of BiVO_(4)photoelectrode as an efficient cocatalyst to accelerate the oxygen evolution *** as-prepared BVO-NB-5P photoelectrode exhibits a remarkable photocurrent density of 1.47 mA·cm^(−2)at 1.23 V versus the reversible hydrogen electrode(RHE)under air mass(AM)1.5 G illumination,which is about 2.8 times higher than the bare BiVO_(4)photoelectrode,and its water splitting rate is 11.3 times higher than bare BiVO_(4).The PEC studies reveal that the spin coated Ni_(3)B crystal cocatalyst could effectively reduce the water oxidation barrier,and improve the surface charge injection efficiency to 94%,which could boost the photogenerated holes reaction to enhance the PEC performance of BiVO_(4)photoelectrode.

关键词： photoelectrochemical water splitting BiVO_(4) Ni_(3)B

Lysosomal chymotrypsin induces mitochondrial fission in apoptotic cells by proteolytic activation of calcineurin

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Protein & Cell 2014年第8期5卷 643-647页

作者： Qianqian Chen Juan Zhang Kai zhao Wei Li Qi Miao Yang Sun xingyu zhao Taotao Wei Fuyu Yang National Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Virology Wuhan Institute of Virology Chinese Academy of Sciences Wuhan 430071 China

Dear Editor Apoptosis is a fundamental physiological process in mam- mals in which cells die by activating a suicide mechanism. The mitochondria are one of the major checkpoints in apoptotic regulation because they serve as sensors and amplifiers of cellular damage （Green and Kroemer, 2004）. After mitochondrial outer membrane permeabilization （MOMP）, the mitochondria release a number of factors that are critically involved in cell death signaling （Tait and Green, 2010）. Bcl-2 family members are regarded as the key reg- ulators of mitochondria-dependent apoptosis （Moldoveanu et al., 2014）; however, dynamin-related protein 1 （Drpl）, which orchestrates mitochondrial fission, also participates in apoptotic regulation by stimulating Bax oligomerization and thereby enhances MOMP （Montessuit et al., 2010）; accord- ingly, the inhibition of Drpl blocks mitochondrial fission and inhibits apoptosis （Cassidy-Stone et al., 2008）.

关键词： Apoptosis fundamental physiological mitochondria-dependent

渠道多样性如何影响制造商使用渠道权力的效果?

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系统工程理论与实践 2021年第10期41卷 2535-2547页

作者：赵星宇庄贵军西安交通大学管理学院西安710049

基于渠道权力理论和多渠道的相关研究,通过检验制造商的渠道多样性在使用渠道权力对破坏性渠道冲突、渠道合作影响中具有的调节作用,确认渠道多样性对渠道权力使用效果的影响.在制造商-经销商合作关系的研究情境下,通过问卷调查的方式... 详细信息

基于渠道权力理论和多渠道的相关研究,通过检验制造商的渠道多样性在使用渠道权力对破坏性渠道冲突、渠道合作影响中具有的调节作用,确认渠道多样性对渠道权力使用效果的影响.在制造商-经销商合作关系的研究情境下,通过问卷调查的方式收集数据,采用多元层次回归方法,对525份有效问卷进行数据分析和假设检验.研究结果表明,随着制造商渠道多样性的提高,使用强制性权力对破坏性渠道冲突的正向影响以及使用非强制性权力对渠道合作的正向影响会增强;但使用非强制性权力对破坏性渠道冲突的负向影响会减弱.

关键词：渠道多样性使用渠道权力破坏性渠道冲突渠道合作

Bid mediates lysosomal membrane permeabilization and the consequent mitochondrial outer membrane permeabilization in RH-35 hepatoma cells

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生物物理学报 2009年第S1期25卷 247-248页

作者： xingyu zhao, Kai zhao, Taotao Wei, Fuyu Yang Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing, 100101, China,

We reported previously that chymotrypsin B is cached in the lysosomes of rat hepatocytes and mediates apoptosis induced by TNF-alpha (1) and H2O2. However, the mechanism

关键词： Bid mediates lysosomal membrane permeabilization and the consequent mitochondrial outer membrane permeabilization in RH-35 hepat RH MOMP

Transforming waste particles into valuable adsorbents via amyloid-mediated molecular engineering

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Science China Chemistry 2025年第1期68卷 317-328页

作者： Qingmin Yang Jian zhao Yujia Zhang xingyu Zhou Hao Ren Bowen Hu Zhongli Lei Lixin Chen Peng Yang School of Material and Chemical Engineering Bengbu University Anhui Provincial Engineering Laboratory of Silicon-Based Materials School of Chemistry and Chemical Engineering Northwestern Polytechnical University Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an Key Laboratory of Polymeric Soft Matter School of Chemistry and Chemical Engineering Shaanxi Normal University International Joint Research Center on Functional Fiber and Soft Smart Textile School of Chemistry and Chemical EngineeringShaanxi Normal University

The high-value utilization of industrial solid waste using a facile and eco-friendly process is of great interest and significance in reducing environmental pollution and developing a green circular economy. Herein, we propose an amyloid-mediated molecular engineering strategy to transform particulate waste into valuable adsorbents for metal ions. Our method has the advantage of aqueous solution fabrication under mild conditions without the use of high-temperature hydrothermal methods and toxic chemical reagents. Amyloid-mediated molecular engineering manipulates the phase transition of bovine serum albumin(BSA)on particulate waste surfaces, resulting in a remarkable ～3.1 times improvement in the adsorption capacity of fly ash, a typical industrial solid waste for gold ions after modification with the phase-transitioned BSA(PTB). The resultant adsorption ability was 69–1,980 times higher than those of conventional and emerging adsorbent materials such as ion exchange resins, activated carbon(AC), covalent organic frameworks(COFs), and metal-organic frameworks(MOFs). We further demonstrated the application of our PTB-modified materials in the recovery of precious metals from low-grade gold ore and electronic waste leachates. Consequently, this strategy could increase the value of waste materials nearly 27 times. In addition, this method is generally extendable to other conventional industrial adsorbents such as resin, clay, and Al2O3, and enhances their adsorption capabilities at least twofold. Overall, this work provides a simple and green approach for improving the adsorption performance of solid particles, and is expected to develop into a universal strategy for transforming waste particles into high-value-added products.

关键词： amyloid-like protein aggregates surface engineering fly ash solid waste adsorption

A further study on the role of lysosomal chymotrypsin B in apoptosis

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生物物理学报 2009年第S1期25卷 233-234页

作者： xingyu zhao, Kai zhao, Taotao Wei, Fuyu Yang National Laboratory of Bio macromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing, 100101, China

We have reported that chymotrypsin B is not just a digestive enzyme secreted by the pancreas, but also cached in rat liver lysosomes and mediates extrinsic apoptotic pathway (1). Herein,

关键词： digestive pancreas cathepsin secreted extrinsic intestine cytosolic ovary hairpin stomach