检索结果-南通市图书馆

The Response of Carbonate System to Watershed Urbanization Process in a Semi-Arid River

Journal of Ocean University of China 2024年第4期23卷 991-1002页

作者： LI Yunxiao DANG Jiajia HUANG xiao YANG Hong WANG xiao LI Lina BAI Jie chen Xi Department of Environmental Science College of Resource and EnvironmentShanxi Agricultural UniversityTaigu 030801China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Department of Geography and Environmental Science University of ReadingWhiteknightsReading RG66ABUK Marine Agriculture Research Center Tobacco Research InstituteChinese Academy of Agricultural SciencesQingdao 266101China 5 Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationCollege of Environmental Science and EngineeringOcean University of ChinaQingdao 266100China

Different from rivers in humid areas,the variability of riverine CO_(2) system in arid areas is heavily impacted by anthropogenic disturbance with the increasing urbanization and water *** this study,the water chemistry and the controls of carbonate system in an urbanized river(the Fenhe River)on the semi-arid Loess Plateau were *** water chemistry of the river water showed that the high dissolved inorganic carbon(DIC)concentration(about 37 mg L^(-1))in the upstream with a karst land type was mainly sourced from carbonate weathering involved by H_(2)CO_(3) and H_(2)SO_(4),resulting in an oversaturated partial pressure of CO_(2)(pCO_(2))(about 800μatm).In comparison,damming resulted in the widespread appearance of non-free flowing river segments,and aquatic photosynthesis dominated the DIC and pCO_(2) spatiality demonstrated by the enriched stable isotope of DIC(δ^(13)CDIC).Especially in the mid-downstream flowing through major cities in warm and low-runoff August,some river segments even acted as an atmospheric CO_(2) *** noteworthy is wastewater input leading to a sudden increase in DIC(>55 mg L^(-1))and pCO_(2)(>4500μatm)in the downstream of Taiyuan City,and in cold November the increased DIC even extended to the outlet of the *** results highlight the effects of aquatic production induced by damming and urban sewage input on riverine CO_(2) system in semi-arid areas,and reducing sewage discharge may mitigate CO_(2) emission from the rivers.

关键词： dissolved inorganic carbon stable carbon isotope carbonate weathering aquatic photosynthesis sewage input the Fenhe River

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Management of coronary artery perforation by embolization:nursing experience from 3 cases

引用

South China Journal of Cardiology 2017年第3期18卷 231-235页

作者： WANG Hui HUANG Ji-leng chen xiao-lan FENG Gen-jiao Department of Cardiology Guangdong Cardiovascular Institute Guangdong General Hospital Guangzhou 510080 China.

INTRODUCTION With the development of economy and improvement of life quality,the incidences of hypertension,hyper-cholesterolemia,diabetes,obesity and smoking have been increased in China,which has led to a significant increase in the morbidity and mortality of coronary artery disease（CAD）~*** it was introduced into China in 1984,coronary intervention（PCI）has developed rapidly and has become the major treatment of CAD because of its unique characteristics of minimal invasive and effective outcome.

关键词： PCI CAP Management of coronary artery perforation by embolization nursing experience from 3 cases

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Identification of marker genes associated with N6-methyladenosine and autophagy in ulcerative colitis

引用

World Journal of Clinical Cases 2024年第10期12卷 1750-1765页

作者： xiao-Yan Liu Dan Qiao Ya-Li Zhang Zi-Xuan Liu You-lan chen Ren-Ye Que Hong-Yan Cao Yan-cheng Dai Department of Gastroenterology Shanghai Traditional Chinese Medicine-Integrated HospitalShanghai University of Traditional Chinese MedicineShanghai 200082China Institute of Digestive Diseases Long Hua Hospital Shanghai University of Traditional Chinese MedicineShanghai 200032China Department of Gastroenterology Shu Guang HospitalShanghai University of Traditional Chinese MedicineShanghai 201203China

BACKGROUND Both N6-methyladenosine(m6A)methylation and autophagy are considered relevant to the pathogenesis of ulcerative colitis(UC).However,a systematic exploration of the role of the com-bination of m6A methylation and autophagy in UC remains to be *** To elucidate the autophagy-related genes of m6A with a diagnostic value for *** The correlation between m6A-related genes and autophagy-related genes(ARGs)was ***,gene set enrichment analysis(GSEA)was performed on the characteristic ***,the expression levels of four characteristic genes were verified in dextran sulfate sodium(DSS)-induced colitis in *** GSEA indicated that BAG3,P4HB and TP53INP2 were involved in the inflammatory response and TNF-αsignalling via nuclear factor ***,polymerase chain reaction results showed significantly higher mRNA levels of BAG3 and P4HB and lower mRNA levels of FMR1 and TP53INP2 in the DSS group compared to the control *** This study identified four m6A-ARGs that predict the occurrence of UC,thus providing a scientific reference for further studies on the pathogenesis of UC.

关键词： Ulcerative colitis m6A Autophagy Characteristic genes Immune infiltration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The extraction of effective components and an antioxidant activity study of Tulipa edulis

引用

Food Science and Human Wellness 2024年第1期13卷 276-286页

作者： Doudou Zhang Dong xiao Tingting Yin Shuangzhi Zhao Olena Zhur Xun xiao Hailun He Leilei chen Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Technology and Business UniversityBeijing 102488China School of Life Sciences Central South UniversityChangsha 410013China State Key Laboratory of Coal Resources and Safe Mining University of Mining and TechnologyXuzhou 221116China Institute of Agro-Food Science and Technology Shandong Academy of Agricultural SciencesJinan 250100China

Plant extracts from natural sources are an excellent choice for food additives and natural *** this study,the active components of Tulipa edulis were extracted and analysed,and their antioxidant capacity was ***,the crude extract mixture was separated and purified using a Sephadex LH-20 gel,and the antioxidant activity of the purified products was *** umbilical vein endothelial human umbilical vein endothelial cells(HUVEC)cells were treated with 35 mmol/L glucose to construct a model of oxidative ***,the cells were treated with the active component to observe whether the products of *** could have a good protective effect on HUVEC cells induced by *** analysis was also performed on HUVEC cells after same treatment to explore the possible mechanism of the component F2 protecting HUVEC cells from oxidative stress induced by high *** results showed that component F2 obtained from *** has strong antioxidant ***,F2 can play a strong antioxidant protective role in HUVEC ***,the gene expression of heme oxygenase 1(HO-1),γ-glutamyl cysteine ligase catalytic subunit(GCLC)and NAD(P)H quinone oxidoreductase-1(NQO1)in HUVEC cells was up-regulated after treated with *** study provides reference value for the further development and application of *** and the d evelopment of functional food.

关键词： Tulipa edulis Oxidative stress Purification Antioxidant

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

我国服务业生产效率区域差异的实证研究——基于高速公路密度和改革力度的视角

引用

经济地理 2014年第8期34卷 118-124页

作者：吴昌南陈小兰江西财经大学产业经济研究院/协同创新中心中国江西南昌330013

采用DEA-Malmquist指数法,测算了2002—2011年间我国各省服务业的全要素生产率(TFP),发现服务业全要素生产率总体上呈波浪形上升,且存在较大的区域差异。进一步地,通过对高速公路密度和国内改革力度等因素对我国服务业全要素生产率影响... 详细信息

采用DEA-Malmquist指数法,测算了2002—2011年间我国各省服务业的全要素生产率(TFP),发现服务业全要素生产率总体上呈波浪形上升,且存在较大的区域差异。进一步地,通过对高速公路密度和国内改革力度等因素对我国服务业全要素生产率影响进行研究,发现高速公路密度与我国服务业全要素生产率大体呈现显著负相关,与东部地区呈显著正相关,与中、西部呈显著负相关;国内改革力度对我国服务业全要素生产率总体呈现显著正相关。最后,本文提出提高我国服务业全要素生产率若干相关建议。

关键词：服务业全要素生产率(TFP) 高速公路密度国内改革力度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

CPL-active hybrid copper(Ⅰ) halides enabled by cation inclusion with chiral crown-ether

引用

Science China Chemistry 2024年第10期67卷 3283-3290页

作者： Peng Fan Li-Xuan Cai xiao-Fang Duan Fan Yin chen-chen Li Zhong-Hua Deng xiao-Zhen Li Qing-Fu Sun College of Chemistry and Materials Science Fujian Normal University State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences Fujian College University of Chinese Academy of Sciences Strait Institute of Flexible Electronics (Future Technologies) Fujian Key Laboratory of Flexible ElectronicsFujian Normal University and Strait Laboratory of Flexible Electronics

Chiral hybrid metal halides with high photoluminescence quantum yield（PLQY） and superior dissymmetry factor(glum) are promising candidates for circularly polarized luminescence（CPL） emitting ***,it is a great challenge to achieve both high glumand large ***,we report a new supramolecular strategy to fabricate chiral hybrid Cu（Ⅰ）-halides with nearunity quantum yields and intense CPL *** dissymmetry factor can be dramatically modulated by tuning the hostguest *** to the chirality and variable conformations of the host-guest complexes,a series of chiral[G@LR/S]2Cu4I6have been *** incorporation of different cations within the chiral LR/Shosts leads to variations of packing modes along the c-axis and different extent of distortions in the[Cu4I6]*** them,[H3O@LR/S]+cations are stacked based on Van der Waals interactions and hierarchically self-assemble into a right/left-handed helix in[H3O@LR/S]2Cu4I6,which results in a high glumof-7×10-3and a large PLQY of 96.92%.Notably,[G@LR/S]2Cu4I6shows promising applications in single-component white light emitting diodes（WLEDs）,exhibiting a maximum dissymmetry factor of -1.2×*** effective host-guest complexation and oriented hierarchical self-assembly provide an effective strategy for the development of high-performance CPL materials.

关键词： host-guest interaction circularly polarized luminescence copper iodide cluster hierarchical self-assembly chirality

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acoustic characterization of hydrate formation and decomposition in clay-bearing sediments

引用

Petroleum Science 2024年第4期21卷 2830-2838页

作者： Yi-Jian Zhu xiao-Mei Yang Xing Huang Hao Li xiao-Hui Wang Yi-Fei Sun Peng xiao Chang-Yu Sun Guang-Jin chen State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and Environment China University of Petroleum

Understanding the acoustic characteristics of hydrates in various sediments is crucial for hydrate resource detection and safe and efficient exploitation, as hydrate occurrence patterns vary greatly in different sediments. In this work, sediments with different bentonite contents, water saturations, and types were prepared to investigate the characteristics of P-wave velocity(reflecting the magnitude of hydrate saturation in the sediment) and amplitude(reflecting the degree of hydrate-sediment cementation) during hydrate formation and depressurization. During hydrate formation, the P-wave velocity and amplitude have similar trends. As clay content increases, the P-wave velocity increase rates quickened. On the other hand, the increased rate of P-wave velocity slows down with the increase of water saturation in the clay-bearing sediments. Comparing various types of sediment shows that the water absorption and swelling of bentonite reduce the pore space, speeding up the cementation of the hydrate with the sediment and increasing P-wave velocity at a faster rate. Correspondence between P-wave velocity and hydrate saturation is strongly related to sediment type, clay content, and water *** rapidly decreasing amplitude in the early stage of hydrate depressurization indicates that hydrate in clay-bearing sediments is weakly cemented to the sediments, which is prone to stratigraphic *** findings of this study offer guidance for hydrate resource assessments in clay-bearing sediments as well as geologic risk estimations during hydrate mining.

关键词： gas hydrate bentonite illite P-wave velocity amplitude

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Two-stage aging treatment to accelerate aging kinetics without impairing strength in B_4C/7A04Al composite

引用

Science China(Technological Sciences) 2024年第8期67卷 2485-2492页

作者： chen YunTao MA GuoNan ZHU ShiZe WANG Dong xiao BoLv MA ZongYi Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Centre of Excellence for Advanced Materials Dongguan 523808China

Aging treatments are the key process to obtain satisfactory strength for 7xxxAl alloys and their composites. However, traditional single-stage(SS) aging is time-consuming to reach a peak strength condition. In this study, an efficient 120℃ + 160℃ two-stage(TS) aging treatment was proposed on a B_4C/7A04Al composite fabricated via powder metallurgy(PM) technology, which could acquire similar peak-aging strength but only took about 15% of the time compared to traditional 120℃ SS aging. The evolution of precipitation during the TS aging was investigated, as well as those of the 7A04Al alloys for comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of η′ phases inside the grains and thus increased the density of precipitates. Moreover, the short aging time limited the coarsening of precipitates and the broadening of precipitatefree zones. The above factors were beneficial for quickly obtaining satisfactory precipitation strengthening effects. The B_4C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption by the chemical reaction between B impurities introduced by B_4C particles and the Al matrix was considered to potentially retard the aging kinetics of the B_4C/7A04Al composite. Nevertheless, the precipitation sequence was not affected.

关键词： aluminum matrix composites aging treatment powder metallurgy mechanical properties precipitation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sustained remission of Cronkhite-Canada syndrome after corticosteroid and mesalazine treatment: A case report

引用

World Journal of Clinical Cases 2024年第14期12卷 2431-2437页

作者： Ya-lan chen Rui-Yao Wang Ling Mei Ran Duan Department of Gastroenterology The Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina Department of Thoracic Surgery The Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina Department of Medical Imageology The Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina

BACKGROUND Cronkhite-Canada syndrome(CCS)is a rare disease of unknown *** optimal treatment for CCS remains *** with corticosteroids is considered the mainstay treatment because of its high efficacy,but the therapeutic strategy for steroid-resistant CCS is not yet *** SUMMARY This is the case of an 81-year-old woman who was diagnosed with *** her severe diarrhea,nausea,vomiting,and hypoproteinemia,hormone therapy(40 mg/d)was administered,and the symptoms improved within 1 *** 3 mo,the patient had no obvious *** polyps were significantly reduced on review gastroscopy and colonoscopy,thus hormone reduction gradually *** hormone level was maintained at 10 mg/d after 6 *** the age of the patient and the side effects of hormones,the patient had no obvious ***,hormone drugs were discontinued,and mesalazine was administered orally at 3 g/*** patient's symptoms continued to improve after a follow-up of 5 *** Corticosteroids and mesalazine are potential treatment options for CCS.

关键词： Cronkhite-Canada syndrome Corticosteroids Mesalazine Gastrointestinal polyposis Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

OH regulator of highly dispersed Ru sites on host Pd nanocrystals for selective ethanol electro-oxidation

引用

Nano Research 2024年第5期17卷 3863-3871页

作者： Zhihe xiao Yueguang chen Renjie Wu Yuwei He Chunfeng Shi Leyu Wang State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China Research Institute of Petroleum Processing SINOPECBeijing 100083China

The ethanol oxidation reaction(EOR)is crucial in direct alcohol fuel cells and chemical ***,the electro-oxidation of ethanol molecules to produce acetaldehyde and carbon monoxide can poison the active sites of nanocatalysts,resulting in reduced performance and posing challenges in achieving high activity and selectivity for ethanol *** this study,we employed a dynamic seed-mediated method to precisely modify highly dispersed Ru sites onto well-defined Pd *** oxyphilic Ru sites serve as"OH valves",regulating water dissociation,while the surrounding Pd atomic arrangements control electronic states for the oxidation dehydrogenation of carbonaceous ***,Ru0.040@Pd nanocubes(Ru:Pd=0.04 at.%),featuring(100)facets in Ru-Pd4 configurations,demonstrate an outstanding mass activity of 6.53 A·mgPd^(-1) in EOR under alkaline conditions,which is 6.05 times higher than that of the commercial Pd/C catalyst(1.08 A·mgPd-1).Through in-situ experiments and theoretical investigations,we elucidate that the hydrophilic Ru atoms significantly promote the dynamic evolution of H_(2)O dissociation into OHads species,while the electron redistribution from Ru to adjacent Pd concurrently adjusts the selective oxidation of C_(2) *** host-guest interaction accelerates the subsequent oxidation of carbonaceous intermediates(CH_(3)CO_(ads))to acetate,while preventing the formation of toxic*CHx and*CO species,which constitutes the rate-determining step.

关键词： OH regulator atomic sites ethanol electro-oxidation host-guest interaction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：