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Satellite observations of coastal upwelling in the northern Arafura Sea

Journal of Oceanology and Limnology 2024年第2期42卷 361-376页

作者： Zheyuan YU Zhanjiu HAO zhenhua XU Peiwen ZHANG Jia YOU Baoshu YIN Hongwei YANG College of Mathematics and System Science Shandong University of Science and TechnologyQingdao 266590China CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China CAS Engineering Laboratory for Marine Ranching Institute of OceanologyChinese Academy of SciencesQingdao 266071China

Coastal upwelling is significant for marine ecosystems by lifting nutrient-rich deep waters into the euphotic zone,thereby increasing primary and secondary *** satellite observations show that the northern Arafura Sea(NAS),especially in the coastal region,features high chlorophyll-a(chl-a)concentrations,implying a strong coastal ***,coastal upwelling in the NAS has not received much *** on a semi-automatic image processing technology,the seasonal and interannual variability of coastal upwelling in the NAS are investigated in this study using satellite-observed sea surface temperature(SST)and wind *** results suggest that there are seasonal coastal upwelling events in the NAS modulated by upwelling-favorable southeast monsoon(SEM).The annual mean days,mean area,and annual mean intensity of coastal upwelling events during the SEM season are 92 days,6514 km^(2),and-5.31×10^(5),respectively,while the corresponding values during the northwest monsoon(NWM)season are 32 days,5569 km^(2),and-1.41×10^(5).It is also found that the SEM coastal upwelling in the NAS displays prominent interannual *** strong upwelling events are found in 2010,2013,2016,and 2017 when the southeast monsoon winds were *** analysis suggests that at the interannual scale,the upwelling index(UI)averaged in the SEM season is negatively correlated with that of three upwelling *** can be attributed to the limitation of onshore geostrophic flow which is evidenced by the negative correlation between the UI and the alongshore difference in sea surface *** study highlights the important role of the southeast monsoon in the temporal variability of coastal upwelling in the NAS.

关键词： coastal upwelling the northern Arafura Sea southeast monsoon interannual variability

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Transient synthesis of carbon-supported high-entropy alloy sulfide nanoparticles via flash Joule heating for efficient electrocatalytic hydrogen evolution

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Nano Research 2024年第4期17卷 3379-3389页

作者： Yuntian Liao Rongtao Zhu Wenjun Zhang Haiyang Zhu Yang Sun Jiale Chen zhenhua Dong Ronghuan Lv School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

High entropy alloys(HEA)are frequently employed as catalysts in electrocatalytic hydrogen ***,the traditional high entropy alloy synthesis methods are time-consuming,energy-intensive,and environmentally polluting,which limits their application in the hydrogen evolution reaction(HER).This study leveraged the capabilities of flash Joule heating(FJH)to synthesize carbon-supported high-entropy alloy sulfide nanoparticles(CC-S-HEA)on carbon cloth(CC)with good self-standing properties within 300 *** carbon thermal shock generated by the Joule heating could pyrolyze the sulfur source into gas,resulting in numerous pore structures and defects on CC,forming an S-doped carbon substrate(CC-S).Then the S atoms were used to stably anchor the metal atoms on CC-S to form high-density uniformly dispersed HEA *** electrochemical test results demonstrated that CC-S-HEA prepared at 60 V flash voltage had HER performance comparable to Pt/*** density functional theory(DFT)calculation indicated that the S atoms on CC-S accelerated the electron transfer between the carbon substrate and HEA ***,the unique electronic structure of CC-S-HEA was beneficial to H*adsorption and promoted catalytic *** simplicity and versatility of FJH synthesis are of great significance for optimizing the synthesis of HEA and improving the quality of HEA products,which provides a broad application prospect for the synthesis of nanocatalysts with efficient HER performance.

关键词： high entropy alloy flash Joule heating carbon thermal shock hydrogen evolution reaction density functional theory

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南朝道经分类的文学、宗教与品鉴的三元合一——以陆修静为中心

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湖南师范大学社会科学学报 2016年第3期45卷 115-119页

作者：蒋振华戴文霞湖南师范大学文学院

为了推动道教的发展,道教人士纷纷编纂和分类道教典籍,其活动蕴含了对于文学、宗教及品鉴的诉求与建构,表现为三元合一的趋势。陆修静把道经分为"三洞"、"四辅",这种分类法隐含了道经创作的宗经崇圣的思想观念。同时,陆修静从宣教立教... 详细信息

为了推动道教的发展,道教人士纷纷编纂和分类道教典籍,其活动蕴含了对于文学、宗教及品鉴的诉求与建构,表现为三元合一的趋势。陆修静把道经分为"三洞"、"四辅",这种分类法隐含了道经创作的宗经崇圣的思想观念。同时,陆修静从宣教立教诉求出发将道经文体分为十二类,表现出较为蒙混、芜杂的宗教文体观,反映了魏晋以来文体学思想对宗教界的渗透和影响,显示了宗教和文学既融合又各司其职的双重属性。而且,道经编纂与文体分类又是一个作品鉴赏批评的过程,需要具有艺术指向的批评理论。

关键词：南朝道经宗经崇圣文体分类鉴赏批评宗教功能

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深部高强锚注切顶自成巷方法与验证

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煤炭学报 2021年第2期46卷 382-397页

作者：王琦张朋蒋振华何满潮李术才王悦江贝山东大学岩土与结构工程研究中心山东济南250061 中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室北京100083 山东天勤工程科技有限公司山东菏泽274700

针对深部高应力回采巷道围岩控制难题,以我国最大采深矿井——山东泰安孙村煤矿为工程背景,对传统沿空掘巷、锚杆(索)支护巷道进行监测分析,结果表明:巷道围岩变形量大,破坏范围广,锚杆大部分处于强度劣化区内,难以发挥支护作用,锚索受... 详细信息

针对深部高应力回采巷道围岩控制难题,以我国最大采深矿井——山东泰安孙村煤矿为工程背景,对传统沿空掘巷、锚杆(索)支护巷道进行监测分析,结果表明:巷道围岩变形量大,破坏范围广,锚杆大部分处于强度劣化区内,难以发挥支护作用,锚索受力大,接近极限破断力。为解决上述问题,系统开展了不同煤柱宽度、地应力大小、顶板围岩强度、切顶高度等影响因素下的数值试验研究,建立了顶板应力释放率、侧向支承压力提升率与围岩变形控制率等定量评价指标,对比分析了多种因素下切顶自成巷与沿空掘巷矿压变化规律与围岩控制机制。基于此,提出了深部高强锚注切顶自成巷方法,利用高强锚注提高巷道顶板完整性,利用顶板预裂切缝切断采空区与巷道顶板之间的应力传递,使巷道处于应力降低区。为进一步验证该方法的合理性,利用自主研发的地质力学模型试验系统,开展了模型试验对比研究,高强锚注切顶自成巷围岩应力比沿空掘巷平均降低20.8%,围岩变形量为后者的45.1%,应力释放与围岩控制效果明显。结合上述研究,提出了相应的工程建议,并在孙村煤矿2215工作面进行了现场应用,监测表明该方法有效控制了巷道围岩变形,实现了无煤柱开采。

关键词：切顶卸压高强锚注无煤柱开采围岩控制矿压变化规律

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“爽”的古代诗学范畴内涵辨析

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中南大学学报（社会科学版） 2017年第2期23卷 154-160页

作者：蒋振华吴咏絮湖南师范大学文学院湖南长沙410081

"爽"是中国古典诗学中一个较为灵活和复杂的批评范畴。"爽"的本义为"明"。两汉魏晋南北朝时期,"爽"的词义、组合词汇、运用范围与内在意蕴不断发展,为"爽"成为一独特的诗学范畴做了准备。作为诗学范畴的"爽"既主要从魏晋南北朝时期用于... 详细信息

"爽"是中国古典诗学中一个较为灵活和复杂的批评范畴。"爽"的本义为"明"。两汉魏晋南北朝时期,"爽"的词义、组合词汇、运用范围与内在意蕴不断发展,为"爽"成为一独特的诗学范畴做了准备。作为诗学范畴的"爽"既主要从魏晋南北朝时期用于人物品藻的美学范畴的"爽"发展而来,又动态地掺合了人们对使用"爽"这一语词描述的其他事物的体验与感受。自刘勰《文心雕龙》问世以来,"爽"及其相关词汇的丰富、范畴的运用和字义的发展与成熟,越来越清晰和频繁地反映在文学批评话语之中。明中后期,"爽"及其相关诗学范畴的运用逐渐走向成熟。作为诗学范畴的"爽"的具体内涵,指向一种明豁畅达、清朗不俗的特质,涉及创作主体、作品的语言体式、情致意境,以及由这些因素综合呈现的作品的总体风格等各个层面。

关键词：爽诗学范畴人物品藻具体内涵创作主体语言体式情致意境总体风格

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浇注式钢桥面铺装工艺和性能研究

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重庆交通大学学报（自然科学版） 2020年第4期39卷 46-51页

作者：赵国云江振华重庆市智翔铺道技术工程有限公司重庆401336 中设设计集团股份有限公司江苏南京210000

为提高浇注式沥青混合料生产效率和高温稳定性,在对MA-10和GA-10两种类型浇注式沥青混合料特点对比分析的基础上,以GA-10工艺拌制MA-10混合料。首先,分别采用两类技术指标评价体系进行室内试验和分析。其次,添加Sasobit改性剂、变动矿... 详细信息

为提高浇注式沥青混合料生产效率和高温稳定性,在对MA-10和GA-10两种类型浇注式沥青混合料特点对比分析的基础上,以GA-10工艺拌制MA-10混合料。首先,分别采用两类技术指标评价体系进行室内试验和分析。其次,添加Sasobit改性剂、变动矿料级配0.075 mm通过率和使用不同种类及用量的沥青胶结料进行配比和试验,分析这3种因素对MA-10混合料路用性能的影响。最后,在60℃条件下进行加速加载试验,检验MA-10混合料的高温稳定性。研究结果表明:以GA-10工艺拌制MA-10时,混合料的贯入度和硬度降低了60%,但是贯入度增量约为贯入度的20%,是GA-10混合料的2倍左右;添加3%Sasobit改性剂时,MA-10的贯入度及其增量分别降低了27%和54%;降低矿料级配0.075 mm筛孔通过率会提高高温稳定性,但也明显影响摊铺流动性;改变沥青种类和含量难以使混合料的高温稳定性和摊铺流动性同时满足技术要求;60℃加速加载试验中,MA-10混合料辙槽深度降低了50%。研究结果说明,以GA-10工艺生产MA-10混合料,并辅以Sasobit改性剂,不但能大幅提高MA-10混合料的高温稳定性,还能够缩短施工周期60%以上。

关键词：桥梁工程浇注式沥青混合料生产工艺路用性能高温稳定性 MA-10 GA-10

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高分子凝聚态结构与化学

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化学进展 2020年第8期32卷 1115-1127页

作者：陈峥商赢双张海博姜振华吉林大学化学学院高性能聚合物合成技术国家地方联合工程实验室特种工程塑料教育部工程研究中心长春130012

高分子凝聚态的研究是高分子科学中的重要内容,在高分子凝聚态的形成机制及对宏观物理性能的影响方面已形成了较为系统的理论和应用实践基础,但在高分子凝聚态的化学性质方面虽有较多的研究工作,却鲜有系统性的归纳总结。凝聚态化学概... 详细信息

高分子凝聚态的研究是高分子科学中的重要内容,在高分子凝聚态的形成机制及对宏观物理性能的影响方面已形成了较为系统的理论和应用实践基础,但在高分子凝聚态的化学性质方面虽有较多的研究工作,却鲜有系统性的归纳总结。凝聚态化学概念的提出,有助于科研人员更深入、系统地研究高分子聚集态结构与其化学性质之间的关系及相关规律。本文以高分子凝聚态为讨论对象,对高分子凝聚态化学性质的一些代表性研究工作进行了归纳和整理,内容包括:(1)高分子结构化学对高分子凝聚态的影响;(2)高分子凝聚态结构对进一步化学反应的影响;(3)高层级凝聚态的化学性质及其对化学反应的影响。希望通过对上述研究工作的实例分析和探讨,为科研人员从化学性质变化的角度去理解和开展高分子凝聚态的研究提供一些参考和启示。

关键词：高分子凝聚态多层次结构化学反应

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Investigation on combustion and emission characteristics of diesel polyoxymethylene dimethyl ethers blend fuels with exhaust gas recirculation and double injection strategy

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 614-630页

作者： Xin Su Rui Su Nan Gao Hao Chen zhenhua Ji Hongming Xu Biao Wang Shaanxi Key Laboratory of New Transportation Energy and Automotive Energy Saving Chang'an University School of Vechicle Engineering Xi'an Aeronautical University Department of Mechanical Engineering University of Birmingham

As a kind of renewable and high oxygen content fuel, polyoxymethylene dimethyl ether（PODE） can be added in diesel to realize energy saving and emissions reduction. To evaluate the combustion and emission characteristics of a diesel engine fueled with diesel and diesel/PODE mixtures, exhaust gas recirculation（EGR） and main-pilot injection strategies with various injection timings were applied. PODE was blended with diesel by volume to form mixtures which were marked as D100（pure diesel）, D90P10（90% diesel + 10% PODE）,and D80P20（80% diesel + 20% PODE）. The results showed that the ignition delay（ID） and combustion duration（CD） of D80P20 were the shortest because of the highest cetane number（CN） and high oxygen content of PODE, indicating more concentrated heat *** low and medium loads, D80P20 achieved the highest peak heat release ratio（PHRR） and peak combustion temperature（PCT） among the three fuels, and it was 14.3% and 3.6%higher than those of D100. PODE blending with diesel can significantly reduce particulate matter（PM） and D80P20 has the lowest PM emissions at all loads. Compared with D100,both PM and nitrogen oxide（NOx） emissions of PODE blends decreased simultaneously with 20% EGR at all loads. With the increase of pilot-main interval, the ID and CD of all test fuels increased, while the NOxand PM emissions decreased. The conclusions of the present research provide a state of the application in light-duty engines fueled with diesel/PODE blends in future work.

关键词： Polyoxymethylene dimethyl ethers Diesel engine NO x Particulate number Pilot plus main injections

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Temperature and heat flux bounds of convection driven by non-uniform internal heating

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Acta Mechanica Sinica 2024年第8期40卷 85-95页

作者： Liangbing Chen An-Kang Gao Zimo Liao zhenhua Wan Nansheng Liu Department of Modern Mechanics University of Science and Technology of ChinaHefei230026China

Convection driven by a spatially non-uniform internal heat source between two horizontal isothermal walls is studied by theoretical analysis and numerical simulation,in order to explore the bounds of the temperature and the vertical heat ***,the rigorous lower bound of the weighted average temperatureis derived analytically,by decomposing the temperature field into a background profile and a fluctuation *** bound obtained for the first time to consider non-uniform heat sources is found to be compatible with the existing bound obtained in uniform internal heat *** physical importance,an analytical relationship is derived as an inequality connectingand the average vertical heat flux,by employing the average heat flux on the bottom wall(qb)as an intermediary *** clarifies the intrinsic relation between the lower bound ofand the upper bound of,namely,these two bounds are essentially equivalent providing an easy way to obtain one from ***,the analytical bounds are extensively demonstrated through a comprehensive series of direct numerical simulations.

关键词： Internally heated convection Nonuniform internal heat source Analytical bounds Background method

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Modeling Reynolds stress anisotropy invariants via machine learning

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Acta Mechanica Sinica 2024年第6期40卷 50-63页

作者： Xianglin Shan Xuxiang Sun Wenbo Cao Weiwei Zhang zhenhua Xia School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China Department of Engineering Mechanics Zhejiang UniversityHangzhou310027China

The presentation and modeling of turbulence anisotropy are crucial for studying large-scale turbulence structures and constructing turbulence ***,accurately capturing anisotropic Reynolds stresses often relies on expensive direct numerical simulations(DNS).Recently,a hot topic in data-driven turbulence modeling is how to acquire accurate Reynolds stresses by the Reynolds-averaged Navier-Stokes(RANS)simulation and a limited amount of data from *** existing studies use mean flow characteristics as the input features of machine learning models to predict high-fidelity Reynolds stresses,but these approaches still lack robust generalization *** this paper,a deep neural network(DNN)is employed to build a model,mapping from tensor invariants of RANS mean flow features to the anisotropy invariants of high-fidelity Reynolds *** the aspects of tensor analysis and input-output feature design,we try to enhance the generalization of the model while preserving invariance.A functional framework of Reynolds stress anisotropy invariants is derived *** irreducible invariants are then constructed from a tensor group,serving as alternative input features for ***,we propose a feature selection method based on the Fourier transform of periodic *** results demonstrate that the data-driven model achieves a high level of accuracy in predicting turbulence anisotropy of flows over periodic hills and converging-diverging ***,the well-trained model exhibits strong generalization capabilities concerning various shapes and higher Reynolds *** approach can also provide valuable insights for feature selection and data generation for data-driven turbulence models.

关键词： Reynolds stress Anisotropy invariant Tensor analysis Machine learning

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