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An organic silicone composite coating for protection of Ti-6Al-4V alloy: Oxidation behavior at 600 c in dry air

cORROSION ScIENcE 2023年 211卷

作者： Lu, Yiliang Xin, Li Li, Xiaonan Zhao, Qingqing Zhang, Kai Du, Yao chen, Zheng Wang, cheng Zhu, Shenglong Wang, Fuhui Univ Sci & Technol China Sch Mat Sci & Engn Shenyang 110016 Peoples R China Chinese Acad Sci Inst Met Res Shi Changxu Innovat Ctr Adv Mat Shenyang 110016 Peoples R China Jiangsu JITRI Rd Engn Technol & Equipment Res Inst Xuzhou 220005 Peoples R China Shenyang Natl Lab Mat Sci Shenyang 110016 Peoples R China Northeastern Univ Sch Mat Sci & Engn Shenyang 110819 Peoples R China AECC Shenyang Liming Aero Engine Co LTD Shenyang 110043 Peoples R China

A new organic silicone composite coating modified by Al, ZrO2, quartz and PbO-SiO2-Al2O3 glass powders was developed to protect Ti-6Al-4V alloy. During oxidation at 600 degrees c in dry air, the coating was oxidized and formed an inorganic composite coating composed of amorphous silica framework and fillers which greatly decreased oxidation rate of substrate. Al2SiO5 formed in coating due to reaction of Al with glass. Glass powders with softening point of 385 degrees c may play important roles in improving coating protectiveness because they can flow to fill the cavities formed by oxidation of organic components in coating at 600 degrees c.

关键词： A Ti-6Al-4V Organic silicone coating B XRD TEM c High temperature Oxidation

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Hayatine inhibits amino acid-induced mTORc1 activation as a novel mTOR-Rag A/c interaction disruptor

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BIOcHEMIcAL AND BIOPHYSIcAL RESEARcH cOMMUNIcATIONS 2021年 583卷 71-78页

作者： Lu, Meiling Yu, Lei Yang, Yanrong Zhu, Jiali Qiang, Sujing Wang, Xinbo Wang, Jia Tan, Xiao Wang, Weifeng Zhang, Yue Wang, Weichao Xie, Jian chen, Xinyan Wang, Hongbing cui, Xianghuan Ge, Xin Tongji Univ Shanghai Peoples Hosp 10 Sch Life Sci & Technol Dept Cent Lab Shanghai 200072 Peoples R China Tongji Univ Shanghai Peoples Hosp 10 Dept Clin Lab Med Med Sch Shanghai 200072 Peoples R China Tongji Univ Shanghai Peoples Hosp 10 Canc Ctr Med Sch Shanghai 200072 Peoples R China Tongji Univ Putuo Dist Peoples Hosp Sch Life Sci & Technol Shanghai 200060 Peoples R China

Abnormal activation of the mechanistic target of rapamycin (mTOR) signaling is commonly observed in many cancers and attracts extensive attention as an oncology drug discovery target, which is encouraged by the success of rapamycin and its analogs (rapalogs) in treatment of mTORc1-hyperactive cancers in both pre-clinic models and clinical trials. However, rapamycin and existing rapalogs have typically short lasting partial responses due to drug resistance, thereby triggering our interest to investigate a potential mTORc1 inhibitor that is mechanistically different from rapamycin. Here, we report that hayatine, a derivative from cissampelos, can serve as a potential mTORc1 inhibitor selected from a natural compound library. The unique properties owned by hayatine such as downregulation of mTORc1 activities, induction of mTORc1's translocation to lysosomes followed by autophagy, and suppression on cancer cell growth, strongly emphasize its role as a potential mTORc1 inhibitor. Mechanistically, we found that hayatine disrupts the interaction between mTORc1 complex and its lysosomal adaptor RagA/c by binding to the hydrophobic loop of Ragc, leading to mTORc1 inhibition that holds great promise to overcome rapamycin resistance. Taken together, our data shed light on an innovative strategy using structural interruption-based mTORc1 inhibitors for cancer treatment. (c) 2021 Elsevier Inc. All rights reserved.

关键词： Hayatine mTOR Rag A c Rapamycin

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correlation between Non-Structural carbohydrates and c:N:P Stoichiometric Ratio of Haloxylon ammodendron under Different Water-Salt Gradients

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FORESTS 2023年第6期14卷 1185-1185页

作者： Yang, Fang Lv, Guanghui Qie, Yadong Xinjiang Univ Sch Ecol & Environm Urumqi 830017 Peoples R China Minist Educ Key Lab Oasis Ecol Urumqi 830017 Peoples R China Minist Educ Xinjiang Jinghe Observat & Res Stn Temperate Deser Jinghe 833300 Peoples R China Guangxi Univ Coll Forestry Guangxi Key Lab Forest Ecol & Conservat Nanning 530004 Peoples R China

Growth is restricted by both water and phosphorus (P), and balancing the relationship between non-structural carbohydrates (NScs) and carbon: nitrogen: phosphorus (c:N:P) is essential for Haloxylon ammodendron to adapt to arid habitats. The survival and growth strategies of the dominant species H. ammodendron in a desert ecosystem were examined in order to better serve the restoration of degraded ecosystems and desertification control. Three water and salt gradients (high water and high salinity, medium water and salinity, and low water and low salinity) in the Aibi Lake Reserve were selected. We analyzed the accumulation and distribution of NScs in the assimilation branches and secondary branches of H. ammodendron and the changes in the measurement ratio characteristics of c:N:P, as well as the soil organic carbon (SOc), total nitrogen (TN), and total phosphorus (TP) content. The results showed that: (1) With the decrease of soil water and salt content, the basal diameter, plant height, crown area, and NSc content of H. ammodendron significantly decreased. This morphological adjustment in the aboveground part is similar to a "self thinning" behavior, aimed at reducing transpiration area and balancing carbon distribution in the body. The carbon accumulation in the body helps the H. ammodendron to resist the dual stresses of drought and salt. (2) With the decrease of water and salt content, the c content of assimilating branches increased significantly, while there was no significant change in secondary branches. However, the N and P content of both branches decreased significantly, and the N: P of both branches was greater than 16, indicating that it was mainly limited by P. (3) The NSc of the two branches was significantly negatively correlated with c, and significantly positively correlated with N and P, and there was a strong positive correlation between the assimilation branches NSc: c: P and NSc: c: P. The synthesis and accumulation of NSc of H. ammodendron wer

关键词： Haloxylon ammodendron different water-salt gradients non-structural carbohydrates c N P stoichiometric ratio

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Rational design of tubular-like NiMoO4•xH2O microspheres and ZIF-67 derived Bi2S3/c for asymmetric supercapacitor

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JOURNAL OF ENERGY STORAGE 2023年 62卷

作者： Xu, Xin Wu, Shang Liu, Yang Liu, chaoyang Sun, Xin Tian, Shuo Wu, Lan Sun, Yuzhi Wang, Zhichao Yang, Quanlu Northwest Minzu Univ Univ Gansu Prov Coll Chem Engn Gansu Prov Biomass Funct Composites Engn Res CtrK Lanzhou 730030 Gansu Peoples R China Lanzhou Univ Arts & Sci Coll Chem Engn Beimiantan 400 Lanzhou 730000 Gansu Peoples R China

The tubular microsphere structure is an effective structure for asymmetric supercapacitors due to its high specific surface area and porosity. It can slow down the volume shrinkage caused by redox process. In this paper, tubular -like NiMoO4 center dot xH2O microspheres were designed to reach a high specific capacity. The NiMoO4 center dot xH2O was pre-pared by hydrothermal method and subsequent annealing treatment showed a tubular microsphere structure with many particles uniformly distributed. And its specific capacity is 943 F g-1 at 1 A center dot g- 1 and capacity retention is 73.4 % after 3000 cycles. The Bi2S3/c was selected as negative material to build an asymmetric supercapacitor (battery-type device). It exhibited an impressive specific capacity (419 F g-1 at 1 A g-1). It was worth noting that the battery-type devices built with NiMoO4 center dot xH2O and Bi2S3/c can achieve a specific energy of 27.1 Wh kg- 1 at 2456.9 W kg- 1 and capacity retention of 69.2 % after 5000 cycles. It was shown that NiMoO4-xH2O and Bi2S3/c as electrode materials have great potential and can enhance the energy storage application of supercapacitors.

关键词： NiMoO4?xH2O Tubular-like microsphere c Asymmetric supercapacitor

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Assessment and simulation of the thermomechanical tensile and creep behavior of c/PEKK composites for aircraft applications above the glass transition temperature

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cOMPOSITE STRUcTURES 2023年第1期318卷

作者： Pedoto, Giuseppe Grandidier, Jean-claude Gigliotti, Marco Vinet, Alain Univ Poitiers Inst Pprime Dept Phys & Mecan Mat ISAE ENSMACNRS Poitiers France Airbus SAS Bldg D42 18 Marius Terce F-31025 Toulouse France SAFRAN Aircraft Engines Ctr Excellence Ind Pieces Compos Tisse Rond point Rene Ravaud F-77550 Moissy Cramayel France

The present work focuses on the assessment and the simulation of the thermomechanical tensile and creep behavior of Poly Ether Ketone Ketone 7002/carbon fibers composites behavior under tensile and creep solicitation between the glass transition temperature and 200 degrees c, via a multiscale approach starting from the behavior of the PEKK 7002 neat *** and creep polymer and composite experimental curves are employed to develop and validate generalized Semi - Analytical Homogenization / Localization Method for the simulation of the thermomechanical tensile and creep behavior of composite laminates. Through the employment of the model, a similarity of behavior between polymer and composites is *** proposed algorithm capabilities of simulating the thermomechanical tensile and creep behavior of composites with different ply orientations and stacking sequences are then presented.

关键词： c PEKK composites Tensile creep Multi-scale semi-analytical method

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The quality and quantity of SOM determines the mineralization of recently added labile c and priming of native SOM in grazed grasslands

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GEODERMA 2023年 432卷

作者： Li, chao Xiao, chunwang Li, Mingxu Xu, Li He, Nianpeng Minzu Univ China Coll Life & Environm Sci Beijing Peoples R China Chinese Acad Sci Inst Geog Sci & Nat Resources Res Key Lab Ecosyst Network Observat & Modeling Beijing Peoples R China Univ Chinese Acad Sci Coll Resources & Environm Beijing Peoples R China Northeast Forestry Univ Ctr Ecol Res Harbin Peoples R China

continuous and pulsed inputs of labile organic carbon (LOc) into soil are common. However, because soil mi-crobial responses to LOc input are rapid, the relative contributions of respiration derived from LOc to total microbial respiration and their influencing factors remain elusive. Furthermore, although numerous studies have explored the priming effect (PE) of soil organic matter (SOM) mineralization induced by LOc addition, few studies have focused on its short-term effects. There are some indications that the response of soil microbes to LOc input depends on the microbial demand of nutrients, especially c and N. Therefore, variations in soil c and N characteristics may further influence microbial response processes to LOc inputs and the decomposition of LOc and SOM, but a comprehensive understanding of this is lacking. To address this gap, 13c-labeled glucose was added to six temperate grassland soils with different c/N ratios (9.98-12.0), which were collected from areas with different grazing exclusion durations and at different soil depths. The microbial respiration was measured at 9-min intervals across a 105-h period. We found that soil microbes responded rapidly to LOc input, and mi-crobial biomass controlled by soil organic c (SOc) and c/N was the most important factor directly influencing the intensity of the microbial response to LOc input. Grazing and deeper soil layers decreased the respiration derived from LOc and their relative contribution to total respiration, mainly attributed to variations in soil c/N and fungal/bacterial ratio (Fu/Ba). LOc addition stimulated SOM decomposition in all soils and increased respiration of SOM by 11.3-92.4 mg c/g SOc, equivalent to 18.7-266.1 % priming. Grazing and increased soil depth resulted in a greater PE and soil c loss, with soil c/N and SOc content being the most important regulators. Overall, this study revealed the important influence of LOc on soil c fluxes and highlighted the important role of SOM quality

关键词： c N ratio SOM quantity Priming effect Grazing exclusion Soil depth Soil c balance

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comparative Evaluation of Physiological Response and Drought Tolerance between cunninghamia unica and c. lanceolata Seedlings under Drought Stress

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FORESTS 2023年第3期14卷 464页

作者： Lei, Xun Wu, Huaxue Yin, Man Zhang, Xi Yang, Hanbo Huang, Xiong Zhu, Peng Sichuan Agr Univ Forestry Ecol Engn Upper Reaches Yangtze River Key Rainy Area West China Plantat Ecosyst Permanent Sc Natl Forestry & Grassland AdmKey Lab Forest Resou Chengdu 611130 Peoples R China

cunninghamia plays an important role in china's southern forest industry in the face of increasingly arid climate;thus it is urgent to identify and screen drought-tolerant varieties. In this study, 2-year-old seedlings of c. unica and c. lanceolata from four provenances were subjected to water-break tests, and their physiological responses to different drought conditions were observed. The results showed that with the aggravation of drought stress, c. unica had more stable changes in relative water content (RWc), water potential (psi w) and intercellular cO2 concentration (ci) with more cumulative amounts of proline (PRO) than c. lanceolata, and its H2O2 maintained at a lower level, along with antioxidant enzyme activities decreasing later as compared with c. lanceolata. Moreover, comprehensive evaluation showed that c. unica had a higher drought tolerance than c. lanceolata as a whole, which could have been shaped by maintaining psi w and opening stomata in its relative drought conditions. This work provides a theoretical basis for understanding the drought tolerance of c. unica and c. lanceolate individuals, so as to accelerate selective breeding in chinese fir.

关键词： c unica lanceolata drought tolerance drought stress comprehensive evaluation

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cuxPd1-xO nanoparticle-reduced graphene oxide nanocomposite catalyzed direct ortho-c-H acylation of 2-aryl pyridines

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cATALYSIS cOMMUNIcATIONS 2023年 174卷

作者： Hu, Qiyan Gao, Liwen Lu, Wenqi chen, Yunyan Wannan Med Coll Inst Synth & Applicat Med Mat Sch Pharm Wuhu 241002 Peoples R China

We report the application of cuxPd1-xO nanoparticle-reduced graphene oxide nanocomposites as efficient cata-lysts for direct c-H bond activation using alcohols as carbonyl sources. The composition of the cuxPd1-xO nanoparticles plays a vital role in determining their catalytic activity because of a composition-dependent synergistic effect. We show that the catalysts can be reused for successive 5 cycles without obviously losing their catalytic activity. Our catalysts offer considerable advantages over previous metallic alloy nanoparticles not only due to their catalytic performance but also for the ease of their synthesis and catalytic robustness.

关键词： Heterogeneous catalysis cu x Pd 1-x O nanoparticle Synergistic effect Recyclable catalyst c H acylation

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M7c3与M23c6碳化物原位转变机制的第一性原理研究

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原子与分子物理学报 2025年 131-140页

作者：蒋枨侯廷平蒋更平刘伍明吴开明 VLADIMIR Tsepelev 武汉科技大学省部共建耐火材料与冶金国家重点实验室武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心钢铁工业耐火材料新技术教育部国际合作联合实验室中国科学院物理研究所俄罗斯乌拉尔联邦大学液态金属物理研究中心

通过析出强化,碳化物作为主要析出相显著提升钢的强度与韧性.在服役过程中,碳化物的晶体结构会发生变化,从而影响到钢构件的长期性能和可靠性.为了探究碳化物转变的具体动力学过程,本工作利用第一性原理计算了碳化物M7c3与M23c6（M=Fe,... 详细信息

通过析出强化,碳化物作为主要析出相显著提升钢的强度与韧性.在服役过程中,碳化物的晶体结构会发生变化,从而影响到钢构件的长期性能和可靠性.为了探究碳化物转变的具体动力学过程,本工作利用第一性原理计算了碳化物M7c3与M23c6（M=Fe, cr等）原位转变机制.研究结果揭示,相同的基元结构间不同的连接方式,是正交结构M7c3和六角结构M7c3互相转化的本质. M7c3中的三棱柱结构通过与周围原子的协同变形转化为M23c6的基元结构,因此基元间的相互作用及配位模式是决定M7c3与M23c6相变的关键因素.再者,随着cr原子取代Fe程度的增加,碳化物亥姆霍兹自由能逐渐降低,其热力学稳定性增强.这项研究不仅揭示了M7c3向M23c6转变背后的物理学机制,而且为理解Fe-cr-c系合金卓越的耐磨性能提供了坚实的理论基础.

关键词： M c 碳化物 M c 碳化物原位转变第一性原理 cr取代

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Physiochemical responses of c. elegans under exposure to lanthanum and cerium affected by bacterial metabolism

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ScIENcE OF THE TOTAL ENVIRONMENT 2023年第1期894卷 165018页

作者： Lan, Wenning Zhang, Xiaojing Lin, Junhao Xiao, Xiaolian chen, Junkun Sun, Shiying Hong, Guanlan Nian, Jingjing Zhang, Fangrong Zhang, Yun Fujian Med Univ Sch Basic Med Sci Key Lab Gastrointestinal Canc Minist Educ Fuzhou 350122 Peoples R China Chinese Acad Sci Xiamen Inst Rare Earth Mat Haixi Inst Xiamen Key Lab Rare Earth Photoelect Funct Mat Xiamen 361021 Peoples R China Univ Sci & Technol China Sch Rare Earths Hefei 230026 Peoples R China Chinese Acad Sci Inst Mat & Chem Ganjiang Innovat Acad Ganzhou 341000 Peoples R China

The increasing demand for rare earth elements (REEs) in modern applications has drawn significant attention. REEs can be introduced into the environment through REE-containing fertilizers, abandoned REE-rich equipment, and mining, persisting and impacting soil quality, nutrient cycles, and plant growth. Scientists have raised concerns about REEs entering the food chain from the environment and eventually accumulating in organisms. Decades of experimental evidence have shown that these effects include inhibited growth, impaired liver function, and alterations in children's intelligence quotients. However, there exists a paucity of research that has elucidated the metabolic-level biological impacts of REEs. In our study, caenorhabditis elegans (c. elegans) was used as a model organism to investigate physiological and inherent metabolic changes under exposure to different concentrations of REEs. The diet bacteria of nematodes play a key role in their life and development. Therefore, we investigated the influence of bacterial activity on the nematodes' response to REE exposure. We observed a concentration-dependent accumulation of REEs in nematodes, which consequently led to a reduction in lifespan and alterations in body length. Exposure to a mixed solution of REEs, in comparison to a single REE solution, resulted in greater toxicity toward nematodes. The metabolic results showed that the above changes were closely related to REE-induced amino acid metabolism disorder, membrane disturbance, DNA damage, and oxidative stress. Of note, the presence of living bacteria elicits REE effects in c. elegans. These findings highlight the potential intrinsic metabolic changes occurring in nematodes under REE exposure. Our study raises awareness of the exposure risks associated with REEs, provides valuable insight into the metabolic-level biological impacts of REEs and contributes to the development of effective mitigation strategies to reduce potential risks to human health.

关键词： Rare earth element NMR spectroscopy Metabolomics Bacterial activity c elegans

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