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Greenhouse gas emissions from Daihai Lake,china:Should eutrophication and salinity promote carbon emission dynamics?

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Journal of Environmental Sciences 2024年第1期135卷 407-423页

作者： Xiangwei Li Ruihong Yu jun Wang Heyang Sun Xinyu Liu Xiaohui Ren Shuai Zhuang Zhiwei Guo Xixi Lu inner Mongolia Key Laboratory of River and Lake Ecology School of Ecology and EnvironmentInner Mongolia UniversityHohhot 010070China Key Laboratory of Mongolian Plateau Ecology and Resource Utilization Ministry of EducationHohhot 010070China Autonomous Region Collaborative innovation Center for integrated Management of Water Resources and Water Environment in the inner Mongolia Reaches of the Yellow River Hohhot 010018China Department of Geography National University of Singapore117570Singapore

Greenhouse gases(GHGs)emitted or absorbed by lakes are an important component of the global carbon ***,few studies have focused on the GHG dynamics of eutrophic saline lakes,thus preventing a comprehensive understanding of the carbon ***,we conducted four sampling analyses using a floating chamber in Daihai Lake,a eutrophication saline lake in inner Mongolia Autonomous Region,china,to explore its carbon dioxide(CO_(2))and methane(ch_(4))*** mean CO_(2)emission flux(FCO_(2))and ch_(4)emission flux(Fch_(4))were 17.54±14.54 mmol/m^(2)/day and 0.50±0.50 mmol/m^(2)/day,*** results indicated that Daihai Lake was a source of CO_(2)and ch_(4),and GHG emissions exhibited temporal *** mean CO_(2)partial pressure(p CO_(2))and ch_(4)partial pressure(p ch_(4))were 561.35±109.59μatm and 17.02±13.45μatm,which were supersaturated relative to the *** regression and correlation analysis showed that the main influencing factors of p CO_(2)were wind speed,dissolved oxygen(DO),total nitrogen(TN)and chlorophyll a(chl.a),whereas the main influencing factors of p ch_(4)were water temperature(WT),chl.a,nitrate nitrogen(NO_(3)^(-)-N),TN,dissolved organic carbon(DOC)and water *** regulated carbon mineralization and organic matter decomposition,and it was an important influencing factor of p CO_(2)and p ch_(4).Additionally,the trophic level index(TLi)significantly increased p ch_(4).Our study elucidated that salinity and eutrophication play an important role in the dynamic changes of GHG ***,research on eutrophic saline lakes needs to be strengthened.

关键词： Eutrophication Salinity Greenhouse gas emissions inland lake inner Mongolia Autonomous Region

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Yuzaoea gen. nov., a new biraphid diatom(Bacillariophyceae)genus and its phylogenetic significance

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Acta Oceanologica Sinica 2024年第2期43卷 130-136页

作者： Honghan Liu chenhong Li Lang Li Xuesong Li Lin Sun junrong Liang jun Zhang Yahui Gao changping chen Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences Xiamen UniversityXiamen 361102China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China Guangxi Key Laboratory of Marine Environmental Science Guangxi Academy of Marine SciencesGuangxi Academy of SciencesNanning 530007China Beibu Gulf Marine industry Research.institute Fangchenggang 538000China

The flexed frustules in pennate diatoms are usually associated with monoraphid diatoms. interestingly, we found a biraphid diatom species with flexed frustules in an offshore intertidal beach environment on Weizhou island,Beihai City, Guangxi Zhuang Autonomous Region, china. Therefore, based on morphological characteristics, we described a new genus of diatoms Yuzaoea sinensis gen. et sp. nov. ch Li, HH Liu, YH Gao & CP chen. The frustule of this genus is characterized by heterogeneous frustule with one concave valve and one convex valve,complete raphe on both valves, straight and moderately eccentric raphe, uniseriate striae and girdle bands with a single row of areolae. The most identifying feature of this genus was the flexed frustule, which.is rare in biraphid diatoms and common in monoraphid diatoms. We compared the morphometric characteristics of genus Yuzaoea with genus Rhoikoneis and several genera within the family Rhoicospheniaceae, including Rhoicosphenia,Campylopyxis, and Cuneolus. Phylogenetic analyses based on SSU rRNA and rbc L showed that the genus Yuzaoea was the sister group to the clade of Rhoicosphenia with a high support value(bootstrap values = 100%), and the clade “Yuzaoea+Rhoicosphenia” was sister to the clade of monoraphid diatoms, in which the genera Achnanthidium, Planothidium and some Cocconeis with high support values(bootstrap = 100%).Morphologically, the genus Yuzaoea shares many morphological features with monoraphid diatoms like genera Achnanthidium and Planothidium and the members within the Rhoicospheniaceae. Therefore, based on a combined morphological studies and phylogenetic results we suggested that this branch may represented the evolution of one kind monoraphid diatoms, from biraphid diatoms(e.g. genus Yuzaoea), to incompleted biraphid diatoms(e.g. genera Rhoicosphenia, Campylopyxis), to monoraphid diatoms(e.g. genera Achnanthidium and Planothidium).

关键词： biraphid diatom marine new genus Rhoicospheniaceae taxonomy Yuzaoea

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Unique genes carried by abundant species enhance ch_(4) emissions during the growing season at the Tibetan Plateau

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Soil Ecology Letters 2024年第2期6卷 83-95页

作者： Yue Liang Liyuan He Jieying Wang Yanfang Liu Wenying Wang chengjie Ren jun Wang Yaoxin Guo Ninglian Wang Fazhu Zhao Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity Northwest UniversityXi’an710127China College of Urban and Environmental Sciences Northwest UniversityXi’an710127China Department of Biology San Diego State UniversitySan DiegoCA92182USA Key Laboratory of Biodiversity Formation Mechanism and Comprehensive Utilization in Qinghai-Tibet Plateau School of Life SciencesQinghai Normal UniversityXining810008China College of Agronomy Northwest A&F UniversityYangling712100China The College of Life Sciences Northwest UniversityXi’an710072China Carbon Neutrality College (Yulin) Northwest UniversityXi’an710127China

ch_(4) emission rates followed an increased pattern during the growing season at Tibetan Plateau.•Unique genes carried by abundant species were positively correlated with ch_(4) emission rates.•Climate factors influenced ch_(4) emission rates by regulating microbial community and their *** play pivotal roles in soil methane(ch_(4))emissions and their functional genes are origins of a key mechanism for soil ***,understanding of the roles of specific genes(e.g.,unique or shared genes carried by species)underlying ch_(4)-cycling remains ***,we measured ch_(4) emission rates and investigated variations in microbial community and the abundance of genes carried by species during the growing season in alpine meadow on the Tibetan *** discovered that ch_(4) emission rates increased from 394.4,745.9,and 1092.7µg ch4 m−2 h−1,in April,june,and August,respectively,and had a positive correlation with unique genes carried by abundant species during the growing ***,we found that unique genes carried by abundant species involved in methanogenesis processes have a higher abundance than methanotrophic *** analysis indicated that climate factors(i.e.,mean monthly temperature(MMT)and mean monthly precipitation(MMP))influenced microbial community and their functional genes,and therefore affected the ch_(4) emission ***,the present study provides a novel insight into the variation of soil ch4 emissions from a functional gene perspective,highlighting the important roles of unique genes carried by abundant species in ch4 emissions in the Tibetan Plateau under seasonal variation.

关键词： soil ch_(4) emissions unique genes abundant species ch_(4)-cycling growing season

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interfacial engineering through lead binding using crown ethers in perovskite solar cells

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Journal of Energy chemistry 2024年第5期92卷 263-270页

作者： Sun-Ju Kim YeonJu Kim Ramesh Kumar chitumalla Gayoung Ham Thanh-Danh Nguyen Joonkyung Jang Hyojung cha Jovana Milić jun-Ho Yum Kevin Sivula Ji-Youn Seo Department of Nano Fusion Technology Pusan National UniversityBusan 46241Republic of Korea Laboratory for Molecular Engineering of Optoelectronic Nanomaterials Institute of Chemical Sciences and EngineeringÉcole Polytechnique Fédérale de Lausanne(EPFL)1015 LausanneSwitzerland Department of Energy Convergence and Climate change Kyungpook National UniversityDaegu 41566Republic of Korea Department of Hydrogen and Renewable Energy Kyungpook National UniversityDaegu 41566Republic of Korea Adolphe Merkle institute University of FribourgCH-1700 FribourgSwitzerland

in the domain of perovskite solar cells(PSCs),the imperative to reconcile impressive photovoltaic performance with lead-related issue and environmental stability has driven innovative *** study pioneers an approach that not only rectifies lead leakage but also places paramount importance on the attainment of rigorous interfacial *** ethers,notably benzo-18-crown-6-ether(B18C6),were strategically integrated at the perovskite-hole transport material *** ethers exhibit a dual role:efficiently sequestering and immobilizing Pb^(2+)ions through host-guest complexation and simultaneously establishing a robust interfacial passivation *** crown ether candidates,guided by density functional theory(DFT)calculations,demonstrated proficiency in binding Pb2+ions and optimizing interfacial *** devices incorporating these materials achieved exceptional power conversion efficiency(PCE),notably 21.7%for B18C6,underscoring their efficacy in lead binding and interfacial *** tech.iques,including time-of-flight secondary ion mass spectrometry(ToF-SiMS),ultraviolet photoelectron spectroscopy(UPS),time-resolved photoluminescence(TRPL),and transient absorption spectroscopy(TAS),unequivocally affirmed Pb^(2+)ion capture and suppression of non-radiative ***,these PSCs maintained efficiency even after enduring 300 h of exposure to 85%relative *** research underscores the transformative potential of crown ethers,simultaneously addressing lead binding and stringent interfacial passivation for sustainable PSCs poised to commercialize and advance renewable energy applications.

关键词： Perovskite solar cells interfacial passivation Crown ether materials Stability

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Numerical Approach for Atmospheric Corrosion Monitoring Based on EiS of a Weathering Steel

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Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 261-271页

作者： ch.Thee Long Hao jun-Hua Dong Xin Mu Wei Ke State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences

Electrochemical impedance spectroscopy （EiS） and film thickness measurement have been employed to study the atmospheric corrosion of a weathering steel covered with a thin electrolyte layer in a simulated coastal-industrial atmosphere. The results indicate that the corrosion rate is a function of the covered electrolyte thickness and the wet/dry cycle. Within each wet/dry cycle, the increased corrosion rate is related to the increased Cl^- and SO4^2- concentration and an enhancement of oxygen diffusion rate with the evaporation of the electrolyte. in addition, the corrosion rate increases during the initial corrosion stage and then decreases as the wet/dry cycle proceeds. Moreover, one mathematical approach based on the numerical integration method to obtain corrosion mass loss of steel from the measurements of EiS has been developed, and this would be useful for the development of indoor simulated atmospheric corrosion tests.

关键词： Weathering steel Atmospheric corrosion Electrochemical impedance spectroscopy Steel rust Coastal-industrial atmosphere

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High-rate ch_(4)-to-C_(2)H_(6) photoconversion enabled by Au/ZnO porous nanosheets under oxygen-free system

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Science china chemistry 2024年第3期67卷 869-875页

作者： Kai Zheng Xiaojing Zhang jun Hu chengbin Xu juncheng Zhu Jing Li Mingyu Wu Shan Zhu Li Li Shumin Wang Yumei Lv Xin He Ming Zuo chengyuan Liu Yang Pan junfa Zhu Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China State Grid Anhui Electric Power Research.institute Hefei 230601China

Photocatalytic ch_(4) coupling into high-valued C_(2)H_(6) is highly attractive,whereas the photosynthetic rate,especially under oxygen-free system,is still ***,we designed the negatively charged metal supported on metal oxide nanosheets to activate the inert C-H bond in ch_(4)and hence accelerate ch_(4) coupling *** an example,the synthetic Au/ZnO porous nanosheets exhibit the C_(2)H_(6) photosynthetic rate of 1,121.6μmol g^(-1)_(cat)h^(-1)and the ch_(4) conversion rate of 2,374.6μmol g^(-1)_(cat)h^(-1) under oxygen-free system,2 orders of magnitude higher than those of previously reported *** virtue of several in situ spectroscopic tech.iques,it is established that the generated Au^(δ-)and O^-species together polarized the C-H bond,while the Au^(δ-)and O^-species jointly stabilized the ch_(3) intermediates,which favored the coupling of ch_(3) intermediate to photosynthesize C_(2)H_(6) instead of overoxidation into CO_(x).Thus,the design of dual active species is beneficial for achieving high-efficient ch_(4)-to-C_(2)H_(6) photoconversion.

关键词： dual surface-active sites selective methane coupling ethane room temperature

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供应链金融能够提高企业全要素生产率吗?

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财经问题研究 2024年第5期 89-104页

作者：卜君朱悦东北财经大学会计学院/中国内部控制研究中心辽宁大连116025

我国正处在转变发展方式、转换增长动力的攻关期,发展供应链金融成为推进供给侧结构性改革、增强金融服务实体经济能力的重要抓手。本文以2007—2021年中国沪深A股上市公司为研究样本,运用双向固定效应模型实证检验了供应链金融对企业... 详细信息

我国正处在转变发展方式、转换增长动力的攻关期,发展供应链金融成为推进供给侧结构性改革、增强金融服务实体经济能力的重要抓手。本文以2007—2021年中国沪深A股上市公司为研究样本,运用双向固定效应模型实证检验了供应链金融对企业全要素生产率的影响及其作用机制。基准分析结果表明,供应链金融有助于提高企业全要素生产率,且这一关系在经过内生性处理和一系列稳健性检验后仍然成立。机制分析结果表明,供应链金融通过优化信贷资源配置和提高资源整合效率两个机制提高企业全要素生产率。异质性分析结果表明,当市场环境较差、行业竞争程度较小、融资约束程度较高、信息披露质量较低、供应链集中度较高、供应链整合度较强、供应链专业化分工程度较高时,供应链金融对企业全要素生产率的提升效应更加明显。本文的研究不仅拓展了企业全要素生产率驱动因素的相关研究,也为践行供应链金融助力经济高质量发展提供了新的证据。

关键词：供应链金融全要素生产率信贷资源配置资源整合效率

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Effect of temperature on suspension magnetization roasting of hematite using biomass waste as reductant:A perspective of gas evolution

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Journal of Central South University 2024年第6期31卷 1870-1887页

作者： CAO Yue SUN Yong-sheng HAN Yue-xin GAO Peng Li Yan-jun School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory iron Ore Resources Shenyang 110819China

The magnetization reduction of hematite using biomass waste can effectively utilize waste and reduce CO_(2) emission to achieve the goals of carbon peaking and carbon *** effects of temperatures on suspension magnetization roasting of hematite using biomass waste for evolved gases have been investigated using TG-FTiR,Py-GC/MS and gas composition *** mixture reduction process is divided into four *** the temperature range of 200-450℃ for mixture,the release of CO_(2),acids,and ketones is dominated in gases *** yield and concentration of small molecules reducing gases increase when the temperature increases from 450 to 900℃.At 700℃,the volume concentrations of CO,H_(2) and ch_(4) peak at 8.91%,8.90% and 4.91%,*** the suspension magnetization roasting process,an optimal iron concentrate with an iron grade of 70.86%,a recovery of 98.66% and a magnetic conversion of 45.70% is obtained at 700℃.Therefore,the magnetization reduction could react greatly in the temperature range of 600 to 700℃ owing to the suitable reducing *** study shows a detail gaseous evolution of roasting temperature and provides a new insight for studying the reduction process of hematite using biomass waste.

关键词： suspension magnetization roasting biomass pyrolysis gases evolution reduction behavior

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Jianqu,a traditional chinese medicine,alleviates functional dyspepsia in high-calorie and high-protein diet mice

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Traditional Medicine Research 2024年第6期9卷 42-54页

作者： Jing-Yan Yang Xiao-Xing Li Juan chen Yan-jun Liu Yue-Hong Wu Ning-Yu Luo Cai-Xia Yang Yang Li Si-Jing Liu Jin-Lin Guo College of Medical Technology Chengdu University of Traditional Chinese MedicineChengdu 611137China chongqing Key Laboratory of Sichuan-chongqing Co-construction for Diagnosis and Treatment of infectious Diseases integrated Traditional chinese and Western Medicine Chengdu 611137China Key Laboratory of characteristic chinese Medicine Resources in Southwest china College of PharmacyChengdu University of Traditional Chinese MedicineChengdu 611137China

Background:Jianqu has been used to alleviate symptoms in patients with functional dyspepsia,but its specific anti-functional dyspepsia effect is still ***,our study aimed to investigate the impact of Jianqu on functional dyspepsia in ***:The phytochemical profile of Jianqu was analyzed by ***,Kunming mice were fed a high-calorie or high-protein diet(HchP)for 7 days,and then orally treated with vehicle or Jianqu(1.62 g/kg body weight(b.w.)and 3.25 g/kg b.w.)for 10 days.A carbon powder solution was used to detect the gastric emptying and intestinal transit *** pathological changes in stomach and duodenum were evaluated by hematoxylin-eosin *** occludin,claudin-1,ZO-1 and CD45 expression was measured by immunocytochemical ***,the serum gastrointestinal hormones were detected by *** addition,the gut microbiota composition was determined using 16S rRNA gene *** cecal short ch.in fatty acids were assessed by gas ***:in general,17 phytochemical compounds were identified from Jianqu,which significantly improved the gastric emptying rate and intestinal transit rate(pincreased the body weight and food intake(pin HchP mice as *** HchP did not cause significant pathological lesions in the gastrointestinal tract,increased the expression of CD45 in the duodenum(pianqu attenuated this abnormal expression of CD45(pintestinal hormones were significantly normalized by Jianqu intervention(pianqu increased the relative abundance of Roseburia as well as short ch.in fatty acids levels in cecum(pion:The present results showed that Jianqu alleviated dyspeptic symptoms in HchP mice possibly through reducing the duodenal leukocyte infiltration,and regulating the expression of gastrointestinal *** effects may be partly related to the increasing cecal short ch

关键词： herbal formula dyspepsia gastrointestinal hormones gastric emptying intestinal transit

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基于调研数据的河北平原农村温室气体核算

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中国环境科学 2024年第4期44卷 1816-1825页

作者：侯越斌徐伟王选郁泽君中国建筑科学研究院有限公司北京100013 天津大学建筑学院天津300072

将农村温室气体排放途径划分为农业生产、畜牧养殖、垃圾污水处理和能源消耗4类,基于《省级温室气体排放清单指南》和iPCC碳排放清单编制方法提出各途径温室气体排放量计算方法,并针对河北省平原地区316个行政村进行核算.借助K均值聚类... 详细信息

将农村温室气体排放途径划分为农业生产、畜牧养殖、垃圾污水处理和能源消耗4类,基于《省级温室气体排放清单指南》和iPCC碳排放清单编制方法提出各途径温室气体排放量计算方法,并针对河北省平原地区316个行政村进行核算.借助K均值聚类算法,根据各途径排放的CO_(2)当量将全部村落划分为3类,并对各类型村落温室气体排放特征进行分析.结果表明:调研农村CO_(2)排放主要来源于能源消耗,占比在70.9%-75.5%;ch4排放主要来源于畜牧养殖和垃圾污水处理,合计占比在73.2%-94.7%;N_(2)O排放主要来源于农业生产,占比在52.3%-84.7%;能源消耗是农村CO_(2)当量排放的主要来源,其次是农业生产和畜牧养殖;节能仍是目前农村地区降低碳排放的有效途径,同时应当注意农田和养殖动物的科学管理,提高垃圾和污水的收集与规范化处理水平.

关键词：平原地区农村温室气体排放聚类分析节能减排

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