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The impact of typhoons on the biogeochemistry of dissolved organic matter in eutrophic bays in northwestern South China Sea

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ACTA OCEANOLOGICA SINICA 2024年第6期43卷 1-17页

作者： lu, xuan Lao, Qibin Chen, Fajin Jin, Guangzhe Chen, Chunqing Zhu, Qingmei Guangdong Ocean Univ Coll Ocean & Meteorol Zhanjiang 524088 Peoples R China Jimei Univ Polar & Marine Res Inst Coll Harbor & Coastal Engn Xiamen 361021 Peoples R China Guangdong Ocean Univ Key Lab Coastal Ocean Variat & Disaster Predict Zhanjiang 524088 Peoples R China Guangdong Ocean Univ Resources & Environm Continental Shelf Sea & Deep Key Lab Climate Dept Educ Guangdong Prov Zhanjiang 524088 Peoples R China

Highly productive estuaries facilitate intense decomposition of dissolved organic matter (DOM) as a carbon source. However, the specific impacts of typhoons on DOM decomposition in eutrophic bays remain unclear. To address this issue, we investigated the spectral characteristics of DOM before and after Typhoon Ewiniar in Zhanjiang Bay, a eutrophic semi-enclosed bay in the northwestern South China Sea. The results revealed that intense microbial decomposition of DOM occurred during the pre-typhoon period because high nutrient inputs facilitated the mobilization of DOM in the bay. However, the intrusion of external seawater induced by the typhoon diluted the nutrient levels in Zhanjiang Bay, reducing the impact of microbial decomposition on DOM during the post-typhoon period. Nevertheless, the net addition of DOM occurred in Zhanjiang Bay during the post-typhoon period, possibly because of the decomposition of particulate organic matter (POM) and desorption of particulate matter. In addition, an increase in apparent oxygen utilization, a decrease in DO saturation and the reduced level of Chl a indicated that organic matter (OM) decomposition was enhanced and OM decomposition shifted to POM decomposition in Zhanjiang Bay after the typhoon. Overall, our study highlighted the shift in the intense OM decomposition from DOM to POM decomposition before and after typhoons in eutrophic bays, providing new insights into the response of typhoons to biogeochemistry.

关键词： dissolved organic matter optical analyses decomposition typhoon northwestern South China Sea CARBON FluORESCENCE MARINE ABSORPTION

It?-Taylor Expansion Method of European Spread Option Pricing for Multivariate Diffusions with Jumps

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Acta Mathematicae Applicatae Sinica 2024年

作者： Ge WANG Yu-xuan lu Qing ZHOU Wei-lin XIAO School of Science Beijing University of Posts and Telecommunications Key Laboratory of Mathematics and Information Networks Beijing University of Posts and Telecommunications Ministry of Education Department of Mathematics National University of Singapore School of Management Zhejiang University

In this paper, we propose a new method for spread option pricing under the multivariate irreducible diffusions without jumps and with different types of jumps by the expansion of the transition density function. By the quasi-Lamperti transform, which unitizes the diffusion matrix at the initial time, and applying the small-time It?-Taylor expansion method, we derive explicit recursive formulas for the expansion coefficients of transition densities and spread option prices for multivariate diffusions with jumps in return. It is worth mentioning that we also give the closed-form formula of spread option price whose underlying asset price processes contain a Merton jump and a double exponential jump, which is innovative compared with current literature. The theoretical proof of convergence is presented in detail.

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Metabolites isolated from Penicillium HDS-Z-1E, an endophytic fungal strain isolated from Taxus cuspidata and their activation effect of catalase

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Chinese Herbal Medicines 2024年第2期16卷 227-230页

作者： Chuan Tang Rui Gao Xiaoyuan Tang Yu Zhang Weixing Feng Baomin Feng xuan lu College of Life and Health Dalian UniversityDalian 116622China

Objective:To study the compounds isolated from Penicillium HDS-Z-1E,an endophytic fungal strain isolated from Taxus cuspidata and their activation effect of catalase(CAT).Methods:The chemical constituents were isolated from Penicillium HDS-Z-1E,by using silica gel,Sephadex LH-20 and *** structural elucidations of five metabolites were elucidated on the basis of spectroscopic including 1 H-NMR,13C-NMR,HMBC and *** activation sites of catalase have been investigated by molecular ***:Five metabolites,compounds(1–5)were isolated from Penicillium HDS-Z-1E and identified as 4-hydroxy-4-methyltetrahydro-2H-pyran-2-one(1),4-hydroxymethyl-5,6-dihydro-pyran-2-one(2),5,6-dihydro-2-oxo-2H-pyran-4-carboxylic(3),N-acetyl-hydrazinobenzoic acid(4),and methyl 2-(2,5-dihydroxyphenyl)acetate(5).Conclusion:Compound 3 is a new *** 3 and 4 may have potential activators of catalase,providing a theoretical basis for the development of CAT activators.

关键词： catalase activators 5,6-dihydro-2-oxo-2H-pyran-4-carboxylic molecular simulation penicillium Taxus cuspidata Sieb.et Zucc

Distribution and sources of sedimentary organic matter in different aquaculture areas of northeastern Zhanjiang Bay using stable carbon and nitrogen isotopes

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Acta Oceanologica Sinica 2024年第6期43卷 38-48页

作者： Fengxia Zhou Shuangling Wang Han Fang Jiani He Liang Ye Zhaohai Ding Cuiting Li Fajin Chen xuan lu Chunqing Chen Yafei Meng College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory for Coastal Ocean Variation and Disaster Prediction Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Climate Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088China

Zhanjiang Bay is a major aquaculture area in China with many types of mariculture products(such as oysters,fish,and shrimp).The culture area and shrimp output in Zhanjiang Bay are ranked first in *** investigated the total organic carbon(TOC),total nitrogen(TN),TOC/TN ratio,and stable isotopes(δ~(13)C and δ~(15)N) of the fish and shrimp feed,fish and shrimp feces,and sedimentary organic matter(SOM) in and around different aquaculture areas of northeastern Zhanjiang B ay to study the impact of aquaculture activities on *** average TOC contents of fish and shrimp feed were 39.20%±0.91% and 39.29%±0.21%,*** average TOC content in the surface sediments of the oyster culture area,the mixed(fish and shrimp) culture area,and the cage fish farm area were 0.66%,0.88%±0.10%,and 0.58%±0.19%,respectively,which may indicate that mixed culture had a greater impact on *** relatively high TOC and TN contents and relatively low TOC/TN ratios,and δ~(15)N values in the upper layer of the core sediment in the mixed culture area could also support the significant influence of mixed *** average δ~(13)C and δ~(15)N values of fish and shrimp feed were -20.6‰±2.2‰ and 1.8‰±1.2‰,respectively,which were different from the isotopic values of SOM in the study area.δ~(13)C and δ~(15)N values for SOM in different aquaculture areas were different from those of nearby reference stations,probably reflecting the influence of *** δ~(13)C and δ~(15)N values in the oyster culture area(-25.9‰ and6.0‰,respectively) seemed to have reduced δ~(13)C and enriched δ~(15)N relative to those of the reference station(-24.6‰ and 5.8‰,respectively).This may reflect the influence of organic matter on oyster *** δ~(15)N value of the station in the mixed culture area(7.1‰±0.4‰) seemed to be relatively enriched in δ~(15)N relative to that of the reference station(6.6‰).Sedimentation and the subsequent degradation of organic matter from mixed cultures may have contrib

关键词： sedimentary organic matter aquaculture stable isotopes sources Zhanjiang Bay

表现为苔藓样损害的拟诊IgG4-RD 1例

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口腔医学研究 2024年第6期40卷 561-563页

作者：张天玉陆轩江潞口颌系统重建与再生全国重点实验室国家口腔疾病临床医学研究中心、陕西省口腔疾病临床医学研究中心、空军军医大学第三附属医院儿童口腔科陕西西安710032 大连市口腔医院修复科辽宁大连116021 口腔疾病研究国家重点实验室、国家口腔疾病临床医学研究中心、四川大学华西口腔医院黏膜病科四川成都610041

免疫球蛋白G4相关疾病(immunoglobulin G4-related disease,IgG4-RD)是一种全身性多器官纤维炎性疾病,罕见累及口腔黏膜的病例报道。本文报道1例临床表现为苔藓样损害的拟诊IgG4-RD的诊治,该报道丰富了IgG4-RD口腔黏膜病损表现,同时提... 详细信息

免疫球蛋白G4相关疾病(immunoglobulin G4-related disease,IgG4-RD)是一种全身性多器官纤维炎性疾病,罕见累及口腔黏膜的病例报道。本文报道1例临床表现为苔藓样损害的拟诊IgG4-RD的诊治,该报道丰富了IgG4-RD口腔黏膜病损表现,同时提示临床实践中鉴别诊断的重要性。

关键词：免疫球蛋白G4相关性疾病自身免疫性疾病苔藓样损害

红色文化融入“大思政课”的逻辑理路与实践进路

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文化创新比较研究 2024年第9期8卷 146-150页

作者：鲁宣四川旅游学院马克思主义学院四川成都610100

办好“大思政课”是贯彻落实高校立德树人的时代要求,是推动高校思政课创新改革的重要举措。红色文化已然成为爱国主义教育与革命传统教育的鲜活教材,不仅是展示中国革命、建设、改革辉煌历程的窗口,更是展现新时代伟大成就的重要途径,... 详细信息

办好“大思政课”是贯彻落实高校立德树人的时代要求,是推动高校思政课创新改革的重要举措。红色文化已然成为爱国主义教育与革命传统教育的鲜活教材,不仅是展示中国革命、建设、改革辉煌历程的窗口,更是展现新时代伟大成就的重要途径,具有重要的叙事价值、传承价值与引导价值。厘清红色文化融入“大思政课”的大小逻辑、内外逻辑、虚实逻辑,进一步深化课程体系建设、创新实践教育体系、凝聚育人整体合力,推动“大思政课”建设,为新时代高等教育人才培养质量和教学改革持续赋能。

关键词：高校红色文化融入大思政课逻辑理路实践进路

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博物馆数据资源管理系统的设计与实现

电子技术（上海） 2024年第1期53卷 145-147页

作者：赵聪卢轩陕西历史博物馆陕西710061

阐述利用现代信息技术,建立博物馆数据资源管理平台的方案,该系统前端界面开发采取Vue框架构建动态Web应用程序,后端采用springboot技术框架搭建。系统功能包括资源采集、标引、管理、下载等模块,为智慧博物馆建设及数据资源的利用奠定... 详细信息

阐述利用现代信息技术,建立博物馆数据资源管理平台的方案,该系统前端界面开发采取Vue框架构建动态Web应用程序,后端采用springboot技术框架搭建。系统功能包括资源采集、标引、管理、下载等模块,为智慧博物馆建设及数据资源的利用奠定数据基础。

关键词：数据资源信息管理系统智慧博物馆

一款多色叠层量子阱红外探测器的读出电路设计

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激光与红外 2024年第5期54卷 746-749页

作者：张露漩于艳李敬国中电科光电科技有限公司北京100015

一款完整的红外焦平面探测器主要包含探测器件、读出电路、封装结构和制冷组件。目前根据不同应用场景,探测波段范围不断变宽、探测灵敏度需求提高、成像速度要求加快,对探测器设计提出了更严格、更复杂的指标要求。其中,读出电路将探... 详细信息

一款完整的红外焦平面探测器主要包含探测器件、读出电路、封装结构和制冷组件。目前根据不同应用场景,探测波段范围不断变宽、探测灵敏度需求提高、成像速度要求加快,对探测器设计提出了更严格、更复杂的指标要求。其中,读出电路将探测光信号转换为电信号传输至系统,是探测器组件的关键核心模块。本文设计了一款对应多色叠层量子阱型器件的红外焦平面探测器读出电路,能够实现同时间、同空间对四波段信号进行探测,并且同时读出,四波段信号的探测积分与读出之间没有互相干扰。探测器规格640×512,像元间距50μm(四波段),各波段信号可实现分时积分、分别可调,采用边积分边读出工作模式,读出帧频可达到四波段探测时≥50 Hz,电路噪声≤0.5 mV,动态范围≥70 dB,电功耗≤600 mW,是一款超大规模低噪声高帧频的高性能读出电路。

关键词：多色量子阱红外探测器读出电路

贸易摩擦影响中国双向FDI互动发展的规模效应分析

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价格月刊 2024年第1期 78-88页

作者：龚梦琪王龙乐王璐璇武汉工程大学法商学院湖北武汉430205

以反倾销案件为指标衡量贸易摩擦,并利用2003—2020年制造业细分行业面板数据,采用动态GMM模型考察贸易摩擦通过规模效应对中国双向FDI互动发展水平的影响,并同时考察了不同时间段、不同双向FDI互动发展水平,不同经济规模下,贸易摩擦通... 详细信息

以反倾销案件为指标衡量贸易摩擦,并利用2003—2020年制造业细分行业面板数据,采用动态GMM模型考察贸易摩擦通过规模效应对中国双向FDI互动发展水平的影响,并同时考察了不同时间段、不同双向FDI互动发展水平,不同经济规模下,贸易摩擦通过规模效应对双向FDI互动发展水平产生的影响。研究发现:第一,全行业的研究表明,贸易摩擦抑制了双向FDI互动发展水平,而贸易摩擦通过规模效应提升了双向FDI互动发展水平。第二,分时间阶段研究表明,金融危机爆发后至今贸易摩擦通过规模效应对双向FDI互动发展水平的促进更高。第三,分双向FDI互动发展水平的高低的研究表明,贸易摩擦通过规模效应促进高双向FDI发展水平行业的双向FDI互动发展水平,抑制低双向FDI互动发展水平行业的双向FDI互动发展水平。第四,分经济规模回归结果表明,贸易摩擦对高经济规模行业双向FDI互动发展水平的抑制影响更高。

关键词：反倾销双向FDI 贸易摩擦动态GMM模型