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Protective Graphite Coating for Two-Dimensional Carbon/Carbon Composites

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Fluid Dynamics & Materials Processing 2024年第1期20卷 97-108页

作者： Wei Shi Zhengyi Li Xiaobing Xu Yingshui Yu Xiaofei Ding Heng ju School of Mechanical and Power Engineering Dalian Ocean UniversityDalian116023China School of Mechanical and Electrical Engineering Gongqing Institute of Science and TechnologyJiujiang332020China

Two-dimensional carbon/carbon(2D C/C)composites are a special class of carbon/carbon composites,generally obtained by combining resin-impregnated carbon fiber clothes,which are then cured and *** study deals with the preparation of a protective coating for these *** coating,based on graphite,was prepared by the slurry *** effect of graphite and phenolic resin powders with different weight ratios was *** results have shown that the coating slurry can fill the pores and cracks of the composite surface,thereby densifying the surface layer of the *** the increase of the graphite powder/phenolic resin weight ratio,the coating density is enhanced while the coating surface flatness decreases;moreover,the protective ability of coating against erosion first increases(from 1:3 to 2:2)and then decreases(from 2:2 to 3:1).When the weight ratio is about 1:1,the coating for 2D C/C composites exhibits the best erosion resistance,which greatly aids these materials during gas *** this case,the erosion rate is decreased by approximately 41.5%at the impact angle of 30°and 52.3%at normal impact,*** can be attributed to the ability of the coating slurry to infiltrate into the substrate,thereby bonding the fibers together and increasing the compactness of the 2D C/C composites.

关键词： Carbon/carbon composites graphite coating microstructure erosion resistance

Highly selectiveα-C(sp^(3))-H arylation of alkenyl amides via nickel chain-walking catalysis

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Chinese Chemical Letters 2024年第7期35卷 271-275页

作者： Haoran Shi Jiaxin Wang Yuqin Zhu Hongyang Li Guodong ju Lanlan Zhang Chao Wang Tianjin Key Laboratory of Structure and Performance for Functional Molecules College of ChemistryTianjin Normal UniversityTianjin 300387China

Herein,we report the migratory hydroarylation of unactivated alkenes with aryl iodides using native and weakly coordinating amide directors under mild *** coordination of the monodentate directing group and the ligand enable the highly regioselective migratory hydroarylation via a chain walking process to form the thermodynamically stable five-membered nickelacyle *** protocol provides a variety of valuableα-aryl-substituted alkylamine products,and exhibited good functional group *** modification of bioactive compounds such as fenofibrate and indomethacin further highlights the synthetic value of this protocol.

关键词： Alkenes Hydroarylation Chain-walking Regioselective Nickel catalysis

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Schur Complement Based Preconditioners for Twofold and Block Tridiagonal Saddle Point Problems

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Communications in Mathematical Research 2024年第2期40卷 214-244页

作者： Mingchao Cai Guoliang ju Jingzhi Li Department of Mathematics Morgan State UniversityBaltimoreMD 21251USA. Solid State R&D Department Shenzhen Tenfong Co.Ltd.Shenzhen 518055P.R.China. Department of Mathematics Southern University of Science and TechnologyShenzhen 518055P.R.China.

In this paper,we consider using Schur complements to design preconditioners for twofold and block tridiagonal saddle point *** type of the preconditioners are based on the nested(or recursive)Schur complement,the other is based on an additive type Schur complement after permuting the original saddle point *** analyze different preconditioners incorporating the exact Schur *** show that some of them will lead to positively stable preconditioned systems if proper signs are selected in front of the Schur *** positive-stable preconditioners outperform other preconditioners if the Schur complements are further approximated *** experiments for a 3-field formulation of the Biot model are provided to verify our predictions.

关键词： Schur complement block tridiagonal systems positively stable preconditioners Routh-Hurwitz stability criterion.

Composition optimization and performance prediction for ultra-stable water-based aerosol based on thermodynamic entropy theory

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Defence Technology（防务技术） 2024年第3期33卷 437-446页

作者： Tingting Kang Canjun Yan Xinying Zhao Jingru Zhao Zixin Liu Chenggong ju Xinyue Zhang Yun Zhang Yan Wu College of Chemical Engineering and Materials Science Tianjin University of Science and TechnologyNo.29 13th AvenueEconomic and Technologic Development ZoneTianjin 300457China Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization Tianjin University of Science and TechnologyTianjin 300457China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

Water-based aerosol is widely used as an effective strategy in electro-optical countermeasure on the battlefield used to the preponderance of high efficiency,low cost and ***,the stability of the water-based aerosol is always unsatisfactory due to the rapid evaporation and sedimentation of the aerosol *** efforts have been devoted to improve the stability of water-based aerosol by using additives with different composition and ***,the lack of the criterion and principle for screening the effective additives results in excessive experimental time consumption and *** the stabilization time of the aerosol is still only 30 min,which could not meet the requirements of the perdurable ***,to improve the stability of water-based aerosol and optimize the complex formulation efficiently,a theoretical calculation method based on thermodynamic entropy theory is *** the factors that influence the shielding effect,including polyol,stabilizer,propellant,water and cosolvent,are considered within *** ultra-stable water-based aerosol with long duration over 120 min is obtained with the optimal fogging agent composition,providing enough time for fighting the electro-optic *** design guideline for choosing the additives with high phase transition temperature and low phase transition enthalpy is also proposed,which greatly improves the total entropy change and reduce the absolute entropy change of the aerosol cooling process,and gives rise to an enhanced stability of the water-based *** theoretical calculation methodology contributes to an abstemious time and space for sieving the water-based aerosol with desirable performance and stability,and provides the powerful guarantee to the homeland security.

关键词： Ultra-stable Water-based aerosol Thermodynamic entropy Composition optimization Performance prediction

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Combined Insights from Leachate Structure and Microstructure Characteristics for Eating Quality of Convenience Rice Processed by Super-Heated and Pressurized Steam Technologies

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Rice science 2024年第4期31卷 475-488,I0035,I0036页

作者： Mingyo HA Hyo-Young JEONG ju Hun LEE Hyun-jung CHUNG Division of Food and Nutrition Chonnam National UniversityGwangju 61186South Korea Department of Biotechnology College of Life Sciences and BiotechnologyKorea UniversitySeoul 02841South Korea Division of Food Science&Culinary Arts Shinhan UniversityGyeonggi 11644South Korea

Convenience rice has become widely popular due to its easy availability for cooking. This study investigated the starch structure and composition of leachate and the microstructure of reheated convenience rice using novel processing technologies: super-heated steaming(SHS), auto-electric cooking(AEC), and pressurized-steam cooking(PSC). Additionally, the effect of two different target water contents(58% and 63%) was also evaluated. The PSC_63% sample had the highest total solids and amylopectin amount in the leachate. The amylopectin amount in the leachate differed significantly based on the targeted water content. Morphological characterization revealed that the swelling of starch and the coated layer on the surface of rice grains were most pronounced in the PSC_63% sample due to the pressure processing. The textural hardness of the AEC_58% sample was much higher than that of the other samples. The PSC_63% sample had the highest textural adhesiveness value, which can be attributed to the highest amylopectin amount in the leachate. Sensory characterization showed that the PSC_63% sample had the highest glossiness, whiteness, moistness, and overall acceptability. The principal component analysis score plots presented substantial differences in the leachate and textural and sensory characteristics of reheated convenience rice among the different processing technologies.

关键词： reheated convenience rice starch structure leachate multi-scale structure eating quality processing technology

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Recombination and repeat-induced point mutation landscapes reveal trade-offs between the sexual and asexual cycles of Magnaporthe oryzae

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Journal of Genetics and Genomics 2024年第7期51卷 723-734页

作者： Xifang Zong Yaxin Lou Mengshuang Xia Kunyang Zhao Jingxuan Chen ju Huang Sihai Yang Long Wang State Key Laboratory of Pharmaceutical Biotechnology School of Life SciencesNanjing UniversityNanjingJiangsu 210000China State Key Laboratory for Crop Genetics and Germplasm Enhancement Bioinformatics CenterAcademy for Advanced Interdisciplinary StudiesNanjing Agricultural UniversityNanjingJiangsu 210000China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjingJiangsu 210000China

The fungal disease caused by Magnaporthe oryzae is one of the most devastating diseases that endanger many crops *** shows that sexual reproduction can be advantageous for fungal diseases as hybridization facilitates ***,the pervasive clonal lineages of *** observed in natural fields contradict this expectation.A better understanding of the roles of recombination and the fungi-specific repeat-induced point mutation(RIP)in shaping its evolutionary trajectory is essential to bridge this knowledge *** we systematically investigate the RIP and recombination landscapes in *** using a whole genome sequencing data from 252 population samples and 92 cross *** data reveal that the RIP can robustly capture the population history of ***,and we provide accurate estimations of the recombination and RIP rates across different *** ***,our results highlight a parent-of-origin bias in both recombination and RIP rates,tightly associating with their sexual potential and variations of effector *** bias suggests a critical trade-off between generating novel allelic combinations in the sexual cycle to facilitate host-jumping and stimulating transposon-associated diversification of effectors in the asexual cycle to facilitate host *** findings provide unique insights into understanding the evolution of blast fungus.

关键词： Magnaporthe oryzae Crossover Repeat-induced point mutation(RiP) Effectors Sexual reproduction

Low-latitude hydroclimate changes related to paleomagnetic variations during the Holocene in coastal southern China

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Frontiers of Earth Science 2024年第2期18卷 324-335页

作者： Tingwei ZHANG Xiaoqiang YANG Jian YIN Qiong CHEN Jianfang HU Lu WANG Mengshan ju Qiangqiang WANG School of Earth Science and Engineering/Guangdong Provincial Key Laboratory of Geodynamics and Geohazards/Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Sun Yat-sen UniversityGuangzhou 510275China Institute of Cultural Heritage Shandong UniversityQingdao 266237China State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China College of Urban and Environmental Sciences Peking UniversityBeijing 100871China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China

The variations in precipitation have displayed a complex pattern in different regions since the *** formation processes may have a significant impact on precipitation,especially during the tropical marine processes and summer monsoon which convey abundant water vapor to coastal southern China and inland ***,we use two 7500 year sedimentary records from the Pearl River Delta and the closed Maar Lake,respectively,in coastal southern China to reconstruct the mid-to-late-Holocene humidity variability and explore its possible relationship with cloud cover modulated by the Earth’s magnetic fields(EMF).Our proxy records document an apparent increase in wetness in coastal southern China between 3.0 and 1.8 kyr *** apparent increase in humidity appears to be consistent with the lower virtual axial dipole moments and,in turn,with a lower *** correlation suggests that the EMF might have been superimposed on the weakened monsoon to regulate the mid-to-late-Holocene hydroclimate in coastal southern China through the medium of galactic cosmic rays,aerosols,and cloud ***,further investigations are needed to verify this interaction.

关键词： hydroclimate variations Earth’s magnetic field coastal southern China the Holocene epoch

A smart hybrid memory scheduling approach using neural models

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Science China(Information Sciences) 2024年第4期67卷 333-334页

作者： Yanjie ZHEN Huijun ZHANG Yongheng DENG Weining CHEN Wei GAO ju REN Yu CHEN Department of Computer Science and Technology Tsinghua University China Huaneng Clean Energy Research Institute

Traditional dynamic random access memory is limited by its low capacity and high cost because of the increasing demand for the memory capacity of applications. Hybrid memory architectures, including new memory hardwar... 详细信息

关键词： Cost reduction

Circ_0004592:An auxiliary diagnostic biomarker for gastric cancer

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World Journal of Gastrointestinal Oncology 2024年第6期16卷 2757-2768页

作者： Shan Kong Yan-Hua Xu Ming Zheng Shao-Qing ju Heng-Chuan Shi Department of Laboratory Medicine Jiangsu Province Official HospitalNanjing 210000Jiangsu ProvinceChina Department of Laboratory Medicine Northern Jiangsu People’s HospitalYangzhou 225000Jiangsu ProvinceChina Department of Laboratory Medicine The Affiliated Hospital of Nantong UniversityNantong 226001Jiangsu ProvinceChina

BACKGROUND Gastric cancer(GC)has a high mortality rate,and robust diagnostic biomarkers are currently ***,the clinical relevance of circular RNAs(circRNAs)as GC biomarkers remains largely *** To evaluate the potential of novel circRNA circ_0004592 in the early screening and prognosis of *** High-throughput sequencing of circRNAs was performed to screen for potential target ***_0004592 expression was examined in GC tissues,cells,and *** samples were collected from healthy subjects’patients,as well as from patients with benign lesions,precancerous lesions,and GC,whereafter the diagnostic accuracy of circ_0004592 was *** correlation between circ_0004592 levels in plasma and clinicopathological data of patients with GC was further *** Circ_0004592 was upregulated in both the tissue and plasma of patients with ***,circ_0004592 expression was higher in patients with precancerous lesions than in healthy controls while being highest in patients with *** the same patient,the postoperative plasma level of circ_0004592 was lower than that in the preoperative ***,circ_0004592 level was significantly correlated with tumor differentiation,tumor depth,and lymph node *** area under the curve(AUC)of plasma circ_0004592 exhibited high sensitivity and specificity for differentiating patients with GC from healthy *** based on circ_0004592,carcinoembryonic antigen,and cancer antigen 199 achieved a superior AUC and was highly *** Plasma circ_0004592 may represent a potential non-invasive auxiliary diagnostic biomarker for patients with GC.

关键词： Biomarker Circular RNA Diagnosis Gastric cancer Plasma