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Numerical study of submerged bending vegetation under unidirectional flow

Water Science and Engineering 2024年第1期17卷 92-100页

作者： Pei-pei Zhang Yi-qing Gong Ken Vui Chua Jie Dai jing-qiao mao College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China Institute of Water Science and Technology Hohai UniversityNanjing 210098China School of Engineering Cardiff UniversityCardiff CF243AAUK

Submerged vegetation commonly grows and plays a vital role in aquatic ecosystems,but it is also regarded as a barrier to the passing *** simulations of flow through and over submerged vegetation were carried out to investigate the effect of vegetation density on flow *** simulations were computationally set up to replicate flume experiments,in which vegetation was mimicked with flexible plastic *** fluid-structure interaction between flow and flexible vegetation was solved by coupling the two modules of the COMSOL *** cases with different vegetation densities were simulated,and the results were successfully validated against the experimental *** contours of the simulated time-averaged streamwise velocity and Reynolds stress were extracted to highlight the differences in mean and turbulent flow *** turbulence intensity was found to be more sensitive to vegetation density than the time-averaged *** developing length increased with the spacing between *** snapshots of the bending vegetation under instantaneous velocity and vorticity revealed that flexible vegetation responded to the effects of eddies in the shear layer by swaying *** first two rows of vegetation suffered stronger approaching flow and were prone to more streamlined *** addition,the origin of tip vortices was investigated via the distribution of *** results reveal the variation of flow properties with bending submerged vegetation and provide useful reference for optimizationofrestorationprojects.

关键词： Computational fluid dynamics Fluid-structure interaction Turbulence Flexible and submerged vegetation

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A STABILITY RESULT FOR TRANSLATINGSPACELIKE GRAPHS IN LORENTZ MANIFOLDS

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Acta Mathematica Scientia 2024年第2期44卷 474-483页

作者：高雅毛井吴传喜 Faculty of Mathematics and Statistics Key Laboratory of Applied Mathematics of Hubei ProvinceHubei UniversityWuhan430062China

In this paper,we investigate spacelike graphs defined over a domain Ω⊂M^(n) in the Lorentz manifold M^(n)×ℝ with the metric−ds^(2)+σ,where M^(n) is a complete Riemannian n-manifold with the metricσ,Ωhas piecewise smooth boundary,and ℝ denotes the Euclidean *** prove an interesting stability result for translating spacelike graphs in M^(n)×ℝ under a conformal transformation.

关键词： mean curvature flow spacelike graphs translating spacelike graphs maximal spacelike graphs constant mean curvature Lorentz manifolds

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Evaluation of microRNA expression profiles in human sperm frozen using permeable cryoprotectant-free droplet vitrification and conventional methods

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Asian Journal of Andrology 2024年第4期26卷 366-376页

作者： Li-Xin Zhang jing mao Yan-Dong Zhou Guang-Yao mao Run-Fa Guo Hong-Shan Ge Xia Chen Department of Histology and Embryology Medical SchoolNantong UniversityNantong 226001China Department of Reproductive Medicine The Affiliated Taizhou People’s Hospital of Nanjing Medical UniversityTaizhou School of Clinical MedicineNanjing Medical UniversityTaizhou 225300China.

For sperm cryopreservation,the conventional method,which requires glycerol,has been used for a long *** addition,the permeable cryoprotectant-free vitrification method has been continuously *** the differences of cryopreservation effects between the two methods have being studied,differences in microRNA(miRNA)profiles between them remain *** this study,we investigated the differences in miRNA expression profiles among conventional freezing sperm,droplet vitrification freezing sperm and fresh human *** also analyzed the differences between these methods in terms of differentially expressed miRNAs(DEmiRs)related to early embryonic development and paternal *** results showed no significant differences between the cryopreservation methods in terms of sperm motility ratio,plasma membrane integrity,DNA integrity,mitochondrial membrane potential,acrosome integrity,and ultrastructural ***,sperm miRNA-sequencing showed differences between the two methods in terms of the numbers of DEmiRs(28 and 19 with vitrification using a nonpermeable cryoprotectant and the conventional method,respectively)in postthaw and fresh sperm *** related to early embryonic development and paternal epigenetics mainly included common DEmiRs between the *** results showed that the differences between conventional freezing and droplet vitrification were minimal in terms of miRNA expression related to embryonic development and *** in sperm miRNA expression due to freezing are not always detrimental to embryonic *** study compared differences in miRNA expression profiles before and after cryopreservation between cryopreservation by conventional and vitrification *** offers a new perspective to evaluate various methods of sperm cryopreservation.

关键词： cryopreservation cryoprotectant-free vitrification early embryonic development paternal epigenetic inheritance sperm miRNAs sucrose

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Effect of magnetic resonance imaging in liver metastases

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World Journal of Gastroenterology 2024年第1期30卷 112-114页

作者： Xing-Liang Huang Xiao-Dong Wang Zhao-Miao Gong Yan-Feng Zheng jing-Xin mao Department of Science and Education Dianjiang People's Hospital of ChongqingChongqing 408399China Department of Science and Industry Chongqing Medical and Pharmaceutical CollegeChongqing 400030China

This letter to the editor is a commentary on a study titled"Liver metastases:The role of magnetic resonance imaging."Exploring a noninvasive imaging evaluation system for the biological behavior of hepatocellular carcinoma(HCC)is the key to achieving precise diagnosis and treatment and improving *** review summarizes the role of magnetic resonance imaging in the detection and evaluation of liver metastases,describes its main imaging features,and focuses on the added value of the latest imaging tools(such as T1 weighted in phase imaging,T1 weighted out of phase imaging;diffusion-weighted imaging,T2 weighted imaging).In this study,I investigated the necessity and benefits of gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid for HCC diagnostic testing and prognostic evaluation.

关键词： Liver metastases Magnetic resonance imaging Liver-specific contrast agents Gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid Hepatocellular carcinoma Hepatobiliary contrast agents

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Nanocavity enriched CuPd alloy with high selectivity for CO_(2) electroreduction toward C_(2)H_(4)

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Rare Metals 2024年第4期43卷 1513-1523页

作者： Ze-Yu Zhang Hai-Bin Wang Fei-Fei Zhang jing-Wei Li Xin-Zhuo Hu Si-Wei Yan Yi-Ming Bai Xun Zhang Gu-Rong Shen Peng-Fei Yin jing Yang Cun-Ku Dong jing mao Hui Liu Xi-Wen Du Institute of New-Energy Materials School of Materials Science and EngineeringTianjin UniversityTianjin300350China

Electrocatalysis of CO_(2)reduction reaction is an effective way to convert CO_(2)into high value-added products,but the selectivity of Cu-based catalysts for C2+products needs to be improved due to the high energy barrier of C-C ***,a viable catalyst design strategy to decrease energy barrier of C-C coupling should be put ***,a nanocavity-enriched CuPd single atom alloy(CuPd SAA)catalyst is designed to promote CC coupling *** faradaic efficiency of CuPd SAA for ethylene and C_(2+)reaches 75.6%and 85.7%at-0.7 V versus reversible hydrogen electrode(RHE),*** on the results given by in situ characterization,the porous hollow structure dramatically increases the ratio of the linear-bond*CO,thus enhancing the faradaic efficiency for *** functional theory(DFT)calculation reveals that the Pd doping can regulate the electronic structure of neighboring Cu atoms to decrease the energy barrier of C-C coupling,further improving the faradaic *** work provides a new idea for designing catalyst with high selectivity for ethylene.

关键词： Adsorption configuration C-C coupling CO_(2) electrocatalysis Ethylene Single atom alloy

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Characteristics and source apportionment of ambient volatile organic compounds and ozone generation sensitivity in urban Jiaozuo,China

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Journal of Environmental Sciences 2024年第4期138卷 607-625页

作者： Pengzhao Li Chun Chen Dan Liu Jie Lian Wei Li Chuanyi Fan Liangyu Yan Yue Gao Miao Wang Hang Liu Xiaole Pan jing mao State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Environmental Monitoring Technology Henan Ecological Environment Monitoring and Safety CenterZhengzhou 450046China Jiaozuo Ecological Environment Monitoring Center of Henan Province Jiaozuo 454003China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

In recent years,many cities have taken measures to reduce volatile organic compounds(VOCs),an important precursor of ozone(O_(3)),to alleviate O_(3) pollution in China.116 VOC species were measured by online and offline methods in the urban area of Jiaozuo from May to October in 2021 to analyze the compositional *** sources were analyzed by a positive matrix factorization(PMF)model,and the sensitivity of ozone generation was determined by ozone isopleth plotting research(OZIPR)*** results showed that the average volume concentration of total VOCs was 30.54 ppbv and showed a bimodal feature due to the rush-hour traffic in the morning and at *** most dominant VOC groups were oxygenated VOCs(OVOCs,29.3%)and alkanes(26.7%),and the most abundant VOC species were acetone and ***,based on the maximum incremental reactivity(MIR)method,the major VOC groups in terms of ozone formation potential(OFP)contribution were OVOCs(68.09μg/m^(3),31.5%),aromatics(62.90μg/m^(3),29.1%)and alkene/alkynes(54.90μg/m^(3),25.4%).This indicates that the control of OVOCs,aromatics and alkene/alkynes should take *** sources of VOCs were quantified by PMF,including fixed sources of fossil fuel combustion(27.8%),industrial processes(25.9%),vehicle exhaust(19.7%),natural and secondary formation(13.9%)and solvent usage(12.7%).The empirical kinetic modeling approach(EKMA)curve obtained by OZIPR on O_(3) exceedance days indicated that the O_(3) sensitivity varied in different *** results provide theoretical support for O_(3) pollution prevention and control in Jiaozuo.

关键词： Volatile organic compounds(VOCs) Online and offline measurement Ozone formation potential(OFP) Positive matrix factorization(PMF) Ozone isopleth plotting research(OZIPR) Jiaozuo

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Early proactive monitoring of DNA-thioguanine in patients with Crohn’s disease predicts thiopurine-induced late leucopenia in NUDT15/TPMT normal metabolizers

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World Journal of Gastroenterology 2024年第12期30卷 1751-1763页

作者： Ting Yang Kang Chao Xia Zhu Xue-Ding Wang Sumyuet Chan Yan-Ping Guan jing mao Pan Li Shao-Xing Guan Wen Xie Xiang Gao Min Huang School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou 510006Guangdong ProvinceChina Institute of Clinical Pharmacology Sun Yat-sen UniversityGuangzhou 510006Guangdong ProvinceChina Department of Gastroenterology The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhou 510655Guangdong ProvinceChina Department of Pharmacy The First Affiliated HospitalSun Yat-sen UniversityGuangzhou 510080Guangdong ProvinceChina Center for Pharmacogenetics and Department of Pharmaceutical Sciences University of PittsburghPittsburghPA 15261United States

BACKGROUND Thiopurine-induced leucopenia significantly hinders the wide application of *** optimization guided by nudix hydrolase 15(NUDT15)has significantly reduced the early leucopenia rate,but there are no definitive biomarkers for late risk leucopenia *** To determine the predictive value of early monitoring of DNA-thioguanine(DNATG)or 6-thioguanine nucleotides(6TGN)for late leucopenia under a NUDT15-guided thiopurine dosing strategy in patients with Crohn’s disease(CD).METHODS Blood samples were collected within two months after thiopurine initiation for detection of metabolite *** leucopenia was defined as a leukocyte count<3.5×10^(9)/L over two *** Of 148 patients studied,late leucopenia was observed in 15.6%(17/109)of NUDT15/thiopurine methyltransferase(TPMT)normal and 64.1%(25/39)of intermediate *** patients suffering late leucopenia,early DNATG levels were significantly higher than in those who did not develop late leucopenia(P=4.9×10^(-13)).The DNATG threshold of 319.43 fmol/μg DNA could predict late leucopenia in the entire sample with an area under the curve(AUC)of 0.855(sensitivity 83%,specificity 81%),and in NUDT15/TPMT normal metabolizers,the predictive performance of a threshold of 315.72 fmol/μg DNA was much more remarkable with an AUC of 0.902(sensitivity 88%,specificity 85%).6TGN had a relatively poor correlation with late leucopenia whether in the entire sample(P=0.021)or NUDT15/TPMT normal or intermediate metabolizers(P=0.018,P=0.55,respectively).CONCLUSION Proactive therapeutic drug monitoring of DNATG could be an effective strategy to prevent late leucopenia in both NUDT15/TPMT normal and intermediate metabolizers with CD,especially the former.

关键词： Thiopurine-induced late leucopenia DNA-thioguanine 6-thioguanine nucleotide Proactive therapeutic drug monitoring Crohn’s disease

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俄罗斯认知话语范式理论阐释与应用探索

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外语学刊 2024年第2期 98-104页

作者：孙淑芳毛京京黑龙江大学俄语学院哈尔滨150080 哈尔滨商业大学外国语学院哈尔滨150028

俄罗斯著名语言学家Е.С.库布里亚科娃基于苏俄心理语言学、称名学和语义学理论,在融合西方认知语言学思想的基础上,提出认知话语范式概念,主要用于俄语词类研究。该范式体现出鲜明的俄罗斯语言学研究特色,具有重要的理论和应用价值。... 详细信息

俄罗斯著名语言学家Е.С.库布里亚科娃基于苏俄心理语言学、称名学和语义学理论,在融合西方认知语言学思想的基础上,提出认知话语范式概念,主要用于俄语词类研究。该范式体现出鲜明的俄罗斯语言学研究特色,具有重要的理论和应用价值。目前国内学界对认知话语范式引介与研究尚处于起步阶段。认知话语范式主张,语言现象应从认知和话语两个维度分析,并在两者的映射关系中深入挖掘语言现象背后的学理依据。本文尝试深入解释认知话语范式概念内涵和理论价值,并揭示其在语言现象实证分析中的方法论价值,探索认知话语范式本土化路径,希冀为其他语言,尤其是汉语词类研究提供借鉴。

关键词：库布里亚科娃认知语言学认知话语范式映射关系词类研究

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Lorentz-Minkowski空间R_(1)^(n+1)中一类Hessian商方程的Dirichlet问题

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数学学报（中文版） 2024年第3期67卷 539-564页

作者：高雅高艳玲毛井湖北大学数学与统计学学院应用数学湖北省重点实验室武汉430062

在适当的假设条件下,本文给出了(n+1)-维Lorentz-Minkowski空间R_(1)^(n+1)中一类带有Dirichlet边值条件的Hessian商方程解的存在唯一性.事实上,该方程可以看作一类预定曲率问题,同时也是工作[Mathematische Nachrichten,2024,297:833-8... 详细信息

关键词：类空超曲面 Lorentz-Minkowski空间 Hessian商方程曲率估计 Dirichlet边值条件

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新媒体时代红色文化融入高职院校思政教育创新路径研究

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新闻研究导刊 2024年第16期15卷 202-207页

作者：毛晶山西工程职业学院山西太原030009

红色文化是我们党在革命、建设和改革中形成的宝贵精神财富,承载着无数革命先辈的英勇事迹和崇高精神,是高校思想政治教育的重要基础和独特优势。文章通过分析新媒体时代红色文化融入高职院校思想政治教育现状,提出构建新的课程体系与... 详细信息

红色文化是我们党在革命、建设和改革中形成的宝贵精神财富,承载着无数革命先辈的英勇事迹和崇高精神,是高校思想政治教育的重要基础和独特优势。文章通过分析新媒体时代红色文化融入高职院校思想政治教育现状,提出构建新的课程体系与加强网络平台建设、加强思政队伍建设与开展实践活动、深化红色旅游资源与思政课的融合、构建红色档案资源传播与保护机制等创新路径,以有效提升思想政治教育的吸引力和实效性。研究表明,红色文化融入大学生思政课,不仅能够丰富教育内容,增强教育互动性,还能增强学生的爱国情感和社会责任感,培养德智体美劳全面发展的社会主义建设者和接班人。新媒体为红色文化的传播提供了新的路径和手段,在高职院校思想政治教育中发挥着至关重要的作用。文章提出,高职院校应继续加强红色资源的挖掘和整理,创新技术,提升教师运用新媒体开展教学的能力,进一步推动思政教育改革和发展。

关键词：红色文化新媒体高职院校思政教育创新路径

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