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铸造 2024年第4期73卷 556-559页

作者：陈红圣王仕明梁超王沛培查明晖徐贵宝中车戚墅堰机车车辆工艺研究所有限公司江苏常州213011

从宏观特征、微观形貌、成分性能及金相组织等方面,分析了金属型低压铸造铸铝件的铸造裂纹特征。对裂纹进行了原因分析,并通过制定针对性改进措施,从源头彻底解决了铸造裂纹,大大提高了产品的铸造成品率。

关键词：铸造裂纹铝合金低压铸造金属型

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耐硒微生物的筛选及其对硒富集和土壤硒活化能力研究

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土壤通报 2024年第4期55卷 1031-1040页

作者：王明释蒋代华陈远权黄雪娇广西南亚热带农业科学研究所广西龙州532415 广西大学农学院广西南宁530005

【目的】筛选出高耐亚硒酸盐并对土壤硒素活化效率高的微生物资源。【方法】采用稀释平板法分离微生物、含硒平板划线法筛选耐硒菌株,利用16S rDNA基因序列分析鉴定菌株,通过将菌株添加到含硒液体培养基中测定其硒富集率。将菌株添加至... 详细信息

【目的】筛选出高耐亚硒酸盐并对土壤硒素活化效率高的微生物资源。【方法】采用稀释平板法分离微生物、含硒平板划线法筛选耐硒菌株,利用16S rDNA基因序列分析鉴定菌株,通过将菌株添加到含硒液体培养基中测定其硒富集率。将菌株添加至富硒土壤中,测定培养前后土壤理化性质变化,评价菌株活化土壤硒的能力。【结果】筛选出两株细菌可耐亚硒酸盐浓度高达500 mmol L^(-1),16S rDNA鉴定菌株分别为粘质沙雷氏菌(Serratia marcescens QZB-1)和彭氏变形杆菌(Proteus penneri LAB-1)。在pH=5~10、温度15~40℃、NaCl<10%条件下两株细菌均能生长。两株细菌均具有较高的亚硒酸盐富集率,其中粘质沙雷氏菌完全富集2 mmol L^(-1)SeO_(3)^(2-)仅需18 h。将两株耐硒细菌制成菌悬液添加到土壤中,均能提高土壤pH值和土壤有效硒含量。两株细菌能改变土壤的硒形态分布,降低土壤中有机结合态硒含量,提高水溶态硒和可交换态硒的含量,其中两株细菌混合施用对土壤的水溶态硒和可交换态硒含量的提高最显著。【结论】从广西富硒土壤中筛选出两株高耐亚硒酸盐的微生物,其拥有较高的硒富集和提高土壤硒有效性的能力,可为富硒土壤资源的开发利用提供微生物资源。

关键词：耐硒菌粘质沙雷氏菌彭氏变形杆菌硒富集土壤硒活化

Vortex identification based on the Liutex method and its effect on fish passage upstream

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Journal of Hydrodynamics 2024年第1期36卷 130-141页

作者： Chun-ying Shen Rui-guo Yang Xiao-tao shi ming-ming wang shi-hua He Faculty of Electrical Power Engineering Kunming University of Science and TechnologyKunming650500China Hubei International Science and Technology Cooperation Base of Fish Passage China Three Gorges UniversityYichang443002China Shanghai Investigation Design and Research Institute Co.LtShanghai200434China

Fishway research is important for mitigating the fragmentation of river habitats caused by hydraulic *** vertical slit fishway is a broadly used fishway type because of its high efficiency and adaptability to water ***,the resulting vortex current disrupts the fish passage hence directly affecting fish *** study aims to accurately capture the vortex structure in the fishway and analyze the effect of vortex elements(vortex structure,vortex intensity,etc.)on *** conducted an analysis of the 3-D current flow field in the fishway through the utilization of an experimental model and the large eddy simulation(LES)***,we captured the vortex information in the fishway at different flow rates using the Liutex vortex identification method and investigated the effect of the vortex on fish *** results revealed that the structures inside the fishway pool occupy most of the room,however,the areas with higher vortex strength were primarily located in the vortex near the vertical seam and the mainstream,the vortex strength inside the fishway gradually increases with increasing flow,suppressing fish *** experienced significantly increased resistance when encountering strong *** suggests that the vortex may act as a physical barrier to fish *** findings highlight the potential negative effects of vortex on fish movement and reiterate the importance of understanding vortex dynamics for aquatic environmental *** an effective tool for identifying vortices in fluid flow,the Liutex method demonstrates features of vortex within the fishway,thereby providing important insights into the interaction between fluid dynamics and aquatic organisms.

关键词： Vertical slit fishway vortex identification method Liutex large eddy simulation(LES) fish experiment computational fluid dynamics

Synthesis and Crystal Structure of Lanthanide Heteropolymolybdate Complex(NH_(4))_(11)Gd[Gd_(4)Mo_(29)O_(100)(H_(2)O)_(23)]·25.75H_(2)O

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Chinese Journal of Structural Chemistry 2000年第6期19卷 432-439页

作者： HUANG Jin-Feng wang shi-ming LIN Shen CAI Xiu-Zhen LIN Xiang Department of Chemistry Fujian Normal UniversityFuzhou350007 Fujian Institute of Research on the Structure of Matter the Chinese Academy of SciencesFuzhouFujian 350002

The title complex crystallizes in the triclinic system, space group P1 with a=16.9568(5), b=18.8631(6), c=24.1640(8), α=100.110(1), β=92\^330(1), γ=113.368(1)°, V=7602.54(4)~3, D_c=3.002 g/cm^3, F(000)=5893, M_r=6245.25, μ(Mo Kα)=5.010mm^-1, Z=2 and final R=0.0722 and wR=0\^1960 for 16015 observed reflections with I≥2σ(I). The Gd(Ⅲ) ion is coordinated by nine oxygen atoms, forming a distorted mono-capped square antiprism, while the Mo(Ⅵ) ions have their different coordination numbers such as 4,5 and 6 with different configurations such as tetrahedron, square pyramid and octahedron, respectively.

关键词： crystal structure gadolinium complex heteropolymolybdate

Locally and globally uniform approximations for ruin probabilities of a nonstandard bidimensional risk model with subexponential claims

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Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 98-113页

作者： LIU Zai-ming GENG Bing-zhen wang shi-jie School of Mathematics and Statistics Central South UniversityChangsha 410083China School of Big Data and Statistics Anhui UniversityHefei 230601China

Consider a nonstandard continuous-time bidimensional risk model with constant force of interest,in which the two classes of claims with subexponential distributions satisfy a general dependence structure and each pair of the claim-inter-arrival times is arbitrarily *** some mild conditions,we achieve a locally uniform approximation of the finite-time ruin probability for all time horizon within a finite *** we further assume that each pair of the claim-inter-arrival times is negative quadrant dependent and the two classes of claims are consistently-varying-tailed,it shows that the above obtained approximation is also globally uniform for all time horizon within an infinite interval.

关键词： bidimensional risk model asymptotic formula subexponential distribution consistently varying tail ruin probability

SETDB1-mediated CD147-K71 di-methylation promotes cell apoptosis in non-small cell lung cancer

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Genes & Diseases 2024年第2期11卷 978-992页

作者： ming-Yan shi Yarong wang Ying shi Ruofei Tian Xiaohong Chen Hai Zhang Ke wang Zhinan Chen Ruo Chen National Translational Science Center for Molecular Medicine & Department of Cell Biology Fourth Military Medical UniversityXi'anShaanxi 710032China

Protein post-translational modifications(PTMs)are at the heart status of cellular signaling events and broadly involved in tumor ***147 is a tumor biomarker with various PTMs,promoting tumor metastasis and metabolism ***,the relationship between the PTMs of CD147 and apoptosis has not been *** our study,we produced a specific anti-CD147-K71 di-methylation(CD147-K71me2)antibody by immunizing with a di-methylated peptide and observed that the level of CD147-K71me2 in non-small cell lung cancer(NSCLC)tissues were lower than that in NSCLC adjacent ***1 was identified as the methyltransferase catalyzing CD147 to generate ***-seq showed that FOSB was the most significant differentially expressed gene(DEG)between wild-type CD147(CD147-WT)and K71-mutant CD147(CD147-K71R)***,we found that CD147-K71me2 promoted the expression of FOSB by enhancing the phosphorylation of p38,leading to tumor cell *** vivo experiments showed that CD147-K71me2 significantly inhibited tumor progression by promoting cell *** together,our findings indicate the inhibitory role of CD147-K71me2 in tumor progression from the perspective of post-translational modification,which is distinct from the pro-cancer function of CD147 itself,broadening our perspective on tumor-associated antigen CD147.

关键词： CD147 di-methylation Cell apoptosis FOSB Non-small cell lung cancer SETDB1

Adhesive Contact of Elastic Solids with Self-Affine Fractal Rough Surfaces

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Acta Mechanica Solida Sinica 2024年第2期37卷 265-270页

作者： Xuan-ming Liang shi-Wen Chen Si-He wang Zhen-Yuan Gong Jun Feng Gang-Feng wang Department of Engineering Mechanics SVL and MMMLXi’an Jiaotong UniversityXi’an710049China OPPO Mobile Telecommunications Corporation Ltd. Dongguan523860China

The elastic adhesive contact of self-affine fractal rough surfaces against a rigid flat is simulated using the finite element method. An array of nonlinear springs, of which the force-separation law obeys the Lennard–Jones potential, is introduced to account for the interfacial adhesion. For fractal rough surfaces, the interfacial interaction is generally attractive for large mean gaps, but turns repulsive as the gap continuously shrinks. The interfacial interactions at the turning point corresponding to the spontaneous contact are shown for various surfaces. For relatively smooth surfaces, the probability density distributions of repulsion and attraction are nearly symmetric. However, for rougher surfaces, the simulation results suggest a uniform distribution for attraction but a monotonously decreasing distribution with a long tail for repulsion. The pull-off force rises with increasing ratio of the work of adhesion to the equilibrium distance, whereas decreases for solids with a higher elastic modulus and a larger surface roughness. The current study will be helpful for understanding the adhesion of various types of rough solids.

关键词： Fractal rough surfaces Adhesion Contact mechanics Lennard-Jones potential

Identification and QTL mapping of Z550, a rice backcrossed inbred line with increased grains per panicle

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Journal of Integrative Agriculture 2019年第3期18卷 526-531页

作者： wang shi-ming CUI Guo-qing wang Hui MA Fu-ying XIA Sai-sai LI Yun-feng YANG Zheng-lin LING Ying-hua ZHANG Chang-wei HE Guang-hua ZHAO Fang-ming Rice Research Institute Academy of Agricultural SciencesSouthwest UniversityChongqing 400715P.R.China

An elite backcrossed inbred line Z550 with increased grains per panicle was identified from advanced backcrosses between Nipponbare and Xihui 18 by simple sequence repeat(SSR) marker-assisted selection(MAS). Z550 carries 13 substitution segments distributed on chromosomes 1, 6, 7, 8, 9, 10, and 12, with an average substitution length of 1.68 Mb. Compared with the Nipponbare parental line, plant height, panicle length, spikelets per panicle, grains per panicle, and grain weight for Z550 were significantly increased. While the grain width of Z550 was significantly narrower, and the seed setting ratio(81.43%) was significantly lower than that of Nipponbare, it is still sufficient for breeding purposes. Quantitative trait loci(QTLs) mapping for important agronomic traits was conducted with the F_2 population derived from Nipponbare crossed with Z550 using the restricted maximum likelihood(REML) method. A total of 16, including 12 previously unreported QTLs were detected, with contribution rates ranging from 1.46 to 10.49%. Grains per panicle was controlled by 8 QTLs, 5 of which increased number of grains whereas 3 decreased it. qGPP-1, with the largest contribution(10.49%), was estimated to increase grains per panicle by 30.67, while q GPP-9, with the minimum contribution rate(2.47%), had an effect of increasing grains per panicle by 15.79. These results will be useful for further development of single segment substitution lines with major QTLs, and for research of their molecular functions via QTL cloning.

关键词： rice backcrossed inbred line yield QTL mapping

Two-Staged Method for Ice Channel Identification Based on Image Segmentation and Corner Point Regression

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China Ocean Engineering 2024年第2期38卷 313-325页

作者： DONG Wen-bo ZHOU Li DING shi-feng wang Ai-ming CAI Jin-yan School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Identification of the ice channel is the basic technology for developing intelligent ships in ice-covered waters,which is important to ensure the safety and economy of *** the Arctic,merchant ships with low ice class often navigate in channels opened up by *** in the ice channel often depends on good maneuverability skills and abundant experience from the captain to a large *** ship may get stuck if steered into ice fields off the *** this circumstance,it is very important to study how to identify the boundary lines of ice channels with a reliable *** this paper,a two-staged ice channel identification method is developed based on image segmentation and corner point *** first stage employs the image segmentation method to extract channel *** the second stage,an intelligent corner regression network is proposed to extract the channel boundary lines from the channel region.A non-intelligent angle-based filtering and clustering method is proposed and compared with corner point regression *** training and evaluation of the segmentation method and corner regression network are carried out on the synthetic and real ice channel *** evaluation results show that the accuracy of the method using the corner point regression network in the second stage is achieved as high as 73.33%on the synthetic ice channel dataset and 70.66%on the real ice channel dataset,and the processing speed can reach up to 14.58frames per second.

关键词： ice channel ship navigation identification image segmentation corner point regression

Matrine-loaded self-adhesive swelling microneedle for inflammation regulation to improve eczema treatment

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Marine Life Science & Technology 2024年第3期6卷 535-546页

作者： Jiale Shen Jiarui wang Meng Wu Yan shi Minhyeock Lee Zhiguo wang ming Kong College of Marine Life Sciences Ocean University of ChinaQingdao 266003China Department of Burn and Plastic Surgery the Affiliated Hospital of Qingdao UniversityQingdao UniversityQingdao 266021China Department of Biotechnology College of Life Sciences and BiotechnologyKorea UniversitySeoul 02841Republic of Korea

Eczema is a common chronic dermatological *** treatments exhibit limited efficacy due to fast drug release resulting in short-term *** of a new treatment strategy that enables sustained drug release and longterm maintenance on the skin surface is necessary.A self-adhesive swelling microneedle patch(SDSMNs)was designed and constructed using a two-step casting *** adhesive substrate was prepared by blending gelatin and dopamine via oxidation of NaIO4,so it could adhere onto the skin surface as well as withstand repeated bending movement without *** swelling needles were fabricated using polyvinyl alcohol(PVA)and polyvinylpyrrolidone(PVP),which could swell by absorbing interstitial fluid and release the drug in a controlled *** also showed desirable antibacterial activities toward *** and *** adhesive microneedles loaded with matrine(MAT-SDSMNs),an antiinflammatory Chinese medicine,dramatically relieved eczema symptoms through IL-17 mediated inflammation *** use of MAT-SDSMNs significantly decreased the infiltration of inflammation cells and level of inflammatory cytokines,reduced the skin thickness,and increased collagen deposition fraction compared with conventional ointment or subcutaneous *** results suggested that MAT-SDSMNs can improve eczema treatment by regulating the local inflammatory microenvironment,providing a simple,self-administered sustainable strategy for eczema treatment.

关键词： Self-adhesive swelling microneedle Eczema Matrine Inflammation regulation