检索结果-南通市图书馆

Flame Morphology and Characteristic of Co-Firing Ammonia with Pulverized Coal on a Flat Flame Burner

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第5期33卷 1935-1945页

作者： WANG Shengye CUI Mingshuang LIU Pengzhong di Yi NIU fang China Coal Research Institute Beijing 100013China Beijing Tiandi Rongchuang Technology Co.Ltd. Beijing 100013China National Energy Technology&Equipment Laboratory of Coal Utilization and Emission Control Beijing 100013China

Ammonia as a new green carbon free fuel co-combustion with coal can effectively reduce CO_(2)emission,but the research of flame morphology and characteristics of ammonia-coal co-combustion are not *** this work,we studied the co-combustion flame of NH_(3)and pulverized coal on flat flame burner under different oxygen mole fraction(X_(i,O_(2)))and NH_(3)co-firing energy ratios(E_(NH_(3))).We initially observed that the introduction of ammonia resulted in stratification within the ammonia-coal co-combustion flame,featuring a transparent flame at the root identified as the ammonia combustion *** to challenges in visually observing the ignition of coal particles in the ammonia-coal co-combustion flame,we utilized Matlab software to analyze flame images across varying E_(NH_(3))and X_(i,O_(2)).The analysis indicates that,compared to pure coal combustion,the addition of ammonia advances the ignition delay time by 4.21 ms to 5.94 *** E_(NH_(3))increases,the ignition delay time initially decreases and then ***,an increase in X_(i,O_(2))results in an earlier ignition delay *** burn-off time and the flame divergence angle of pulverized coal demonstrated linear decreases and increases,respectively,with the growing ammonia *** addition of ammonia facilitates the release of volatile matter from coal ***,in high-ammonia environments,oxygen consumption also impedes the surface reaction of coal ***,measurements of gas composition in the ammonia-coal flame flow field unveiled that the generated water-rich atmosphere intensified coal particle gasification,resulting in an elevated concentration of ***,nitrogen-containing substances and coke produced during coal particle gasification underwent reduction reactions with NO_(x),leading to reduced NO_(x)emissions.

关键词： co-firing ammonia with coal flame characteristic gas component ignition delay time burn-off time flame divergence angle flat flame burner flame morphology

Fabrication of carboxymethyl chitosan–hemicellulose resin for adsorptive removal of heavy metals from wastewater

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第3期28卷 625-632页

作者： Shu-Ping Wu Xiang-Zi Dai Jia-Rui Kan fang-di Shilong Mai-Yong Zhu Institute of Polymer Materials School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China

Carboxymethyl chitosan–hemicellulose resin（CMCH） was synthesized by thermal cross-linking process and characterized by FTIR, TGA, and SEM. Subsequently, the adsorption properties of CMCH toward Ni（Ⅱ）,Cd（Ⅱ）, Cu（Ⅱ）, Hg（Ⅱ）, Mn（Ⅶ） and Cr（Ⅵ） were evaluated. Various factors affecting the uptake behavior such as pH, temperature, contact time and the initial concentration of the metal ions were *** results showed that all adsorption processes fit the pseudo-second-order model and Langmuir isotherm equation. Significantly, the regeneration experiments showed CMCH can be used as a potentially recyclable and effective adsorbent for the removal and recovery of metal ions from wastewater.

关键词： Biomass Carboxymethyl chitosan Hemicellulose Heavy metalions Adsorbent

Structural characteristics and drivers of greenhouse gas emissions at county-level and long-time scales:A case study of the Anji County,China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第6期140卷 319-330页

作者： Zhouxiang Cai Liting Hu di Chen Ying Zhang Xuekun fang College of Environmental&Resource Sciences Zhejiang UniversityHangzhou 310058China Center for Global Change Science Massachusetts Institute of TechnologyCambridgeMA 02139United States Anji Meteorological Bureau Anji 313300China

To achieve carbon neutrality,the Chinese government needs to gain a comprehensive understanding of the sources and drivers of greenhouse gas(GHG)emissions,particularly at the county *** County in eastern China is a typical example of an industrial transformation from quarrying to a low-carbon *** study analyzed the decoupling types and structural characteristics of GHG emissions and the driving factors of carbon dioxide(CO_(2))emissions in the Anji from 2006 to 2019,and explored the differences between countylevel and provincial-level or city-level *** was observed that energy-related activities are the main source of GHG emissions in Anji and that economic development is the driving factor behind the increasing CO_(2)***,industrial transformation and upgradation coupled with the alternative use of clean energy limit the growth of GHG *** study details the GHG emissions of county during the industrial transformation stage and provides corresponding policy recommendations for county governments.

关键词： County GHG emissions Decoupling Driving factors Policy recommendations

Electrochemical Study and Application on Shikonin at Poly（diallyldimethylammonium chloride） Functionalized Graphene Sheets Modified Glass Carbon Electrode

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2013年第4期29卷 798-805页

作者： AN Jing LI Ji-ping CHEN Wen-xia YANG Chun-xia HU fang-di WANG Chun-ming School of Pharmacy Hospital of Lanzhou University College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China

The electrochemical behaviors of shikonin at a poly（diallyldimethylammonium chloride） functionalized graphene sheets modified glass carbon electrode（PDDA-GS/GCE） have been investigated. Shikonin could exhibit a pair of well-defined redox peaks at the PDDA-GS/GCE located at 0.681 V（Epa） and 0.662 V（Epc）[vs. saturated calo- mel electrode（SCE）] in 0.1 mol/L phosphate buffer solution（pH=2.0） with a peak-to-peak separation of about 20 mV, revealing a fast electron-transfer process. Moreover, the current response was remarkably increased at PDDA- GS/GCE compared with that at the bare GCE. The electrochemical behaviors of shikonin at the modified electrode were investigated. And the results indicate that the reaction involves the transfer of two electrons, accompanied by two protons and the electrochemical process is a diffusional-controlled electrode process. The electrochemical para- meters of shikonin at the modified electrode, the electron-transfer coefficient（a）, the electron-transfer number（n） and the electrode reaction rate constant（ks） were calculated to be as 0.53, 2.18 and 3.6 s^-1, respectively. Under the optimal conditions, the peak current of differential pulse voltammetry（DPV） increased linearly with the shikonin concentra- tion in a range from 9A72×10^-8 mol/L to 3,789×10^-6 mol/L with a detection limit of 3,157× 10^-8 mol/L. The linear regression equation was Ip=O.7366c＋0.7855（R=0.9978; lp： 10-7 A, c： 10-8 mol/L）. In addition, the modified glass carbon electrode also exhibited good stability, selectivity and acceptable reproducibility that could be used for the sensitive, simple and rapid determination of shikonin in real samples. Therefore, the present work offers a new way to broaden the analytical application of graphene in pharmaceutical analysis.

关键词： Shikonin Poly(diallyldimethylammonium chloride) functionalized graphene sheets modified glass carbon electrode(PDDA-GS/GCE) Cyclic voltammetry differential pulse voltammetry Electrochemical sensor

社会资本参与农业水价综合改革的理论与实践研究

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

水利发展研究 2024年第1期24卷 56-60页

作者：贺骥陈佳川康健张娴马华安方迪水利部发展研究中心北京100038 云南省水利水电科学研究院云南昆明650228

社会资本是水利基础设施建设重要的资金筹措渠道。建立社会资本参与农业水价综合改革机制,鼓励和引导社会资本参与到农田水利基础设施的投资建设、运营管理和维修养护等方面,能够扩大农田水利设施建设有效投资、提高农田水利基础设施和... 详细信息

社会资本是水利基础设施建设重要的资金筹措渠道。建立社会资本参与农业水价综合改革机制,鼓励和引导社会资本参与到农田水利基础设施的投资建设、运营管理和维修养护等方面,能够扩大农田水利设施建设有效投资、提高农田水利基础设施和相关公共服务的供给能力,发挥“两手发力”的要素资源配置优势、提升水资源管理能力、优化水资源配置格局,促进农业用水方式由粗放向节约集约转变,提高水资源整体承载能力。文章从理论层面研究提出了社会资本参与农业水价综合改革的总体思路,梳理了社会资本参与农业水价综合改革的方式与内容;并以陆良县恨虎坝项目区为例,从实践层面总结归纳社会资本参与恨虎坝项目区农业水价综合改革的做法及成效,以期为相关地区推进农业水价综合改革提供参考。

关键词：农业水价综合改革社会资本节水政府和社会资本合作

Hierarchical pomegranate-structure design enables stress management for volume release of Si anode

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第26期157卷 1-10页

作者： fang di Zhenxing Wang Chong Ge Lixiang Li Xin Geng Chengguo Sun Haiming Yang Weimin Zhou Dongying Ju Baigang An Feng Li Key Laboratory of Energy Materials and Electrochemistry Liaoning Province School of Chemical EngineeringUniversity of Science and Technology LiaoningAnshan 114051China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Hainan Provincial Key Lab of Fine Chemistry School of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China Jihua Laboratory Guangdong ProvinceFoshan 528200China

Si is a promising anode material for lithium-ion batteries owing to its high theoretical ***-ever,large stress during(de)lithiation induces severe structural pulverization,electrical contact failure,and unstable solid-electrolyte interface,which hampers the practical application of Si ***,a Si-based anode with a hierarchical pomegranate-structure(HPS-Si)was designed to modulate the stress variation,and a sub-micronized Si-based sphere was assembled by the nano-sized Si nanospheres with sub-nanometer-sized multi-phase modification of the covalently linked SiO_(2-x),SiC,and *** sub-micronized HPS-Si stacked with Si nanospheres can avoid agglomerates during cycling due to the high surface energy of ***,the reasonable pore structure from SiO_(2) reduction owing to density difference is enough to accommodate the limited volume *** Si spheres with a size of about 50 nm can prevent ***_(2-x),and SiC as flexible and rigid layers,have been syner-gistically used to reduce the surface stress of conductive carbon layers to avoid *** covalent bonding immensely strengthens the link of the modification with Si nanospheres,thus resisting stress ***,a full cell comprising an HPS-Si anode and a LiCoO_(2) cathode achieved an energy density of 415 Wh kg^(-1) with a capacity retention ratio of 87.9%after 300 cycles based on the active *** is anticipated that the hierarchical pomegranate-structure design can provide inspiring insights for further studies of the practical application of silicon anode.

关键词： Stress management Silicon anode Hierarchical structure Covalent bonding Volume release

Stability Study on the Bucket Foundation with Multi-Compartment During the Floating-up Process Considering Air Compressibility

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

China Ocean Engineering 2023年第6期37卷 975-988页

作者： YE fang-di LIAN Ji-jian GUO Yao-hua WANG Hai-jun XIAO Tian-run XIONG Dong-zhi YU Tong-shun State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Tianjin University of Technology Tianjin 300384China College of Engineering Ocean University of ChinaQingdao 266100China

In the process of developing offshore wind power towards deeper waters,the advantages of the bucket foundation in terms of integrated construction and economy are becoming increasingly *** contrast to conventional floating bodies,the air-floating bucket foundations can achieve self-floating with the help of the air in the compartment and adjust its buoyancy and stability by controlling the air volume in the *** construction process of the bucket foundation involves the control of air in the compartment,thus making it more difficult to *** after the prefabrication of the bucket foundation,the stability of the bucket foundation at the floating-up stage is particularly *** stability of a multi-compartment bucket foundation during the floating-up process cannot be accurately evaluated as the existing theoretical method of air-floating structures does not adequately consider air *** ensure the safety of the floating-up process,a theoretical method based on the idea of intact stability has been developed to analyze the stability of the air-floating bucket foundations,which will allow accurate calculation of the righting arm for different tilt states and critical air leakage *** the same time,accuracy and feasibility of the proposed theoretical method are verified through indoor model tests and practical operation of the prototype structure during the floating-up *** addition,measures to enhance the stability of the bucket foundation are proposed through sensitivity analysis of influencing factors.

关键词： offshore wind power bucket foundation air-floating structure stability

重晶石纤维混凝土在医用直线加速器机房的应用

在线全文

学校读者我要写书评

暂无评论

价值工程 2024年第22期43卷 85-87页

作者：黄狄昉黄厚军汤序霖叶嘉彬广州机施建设集团有限公司广州510725 华南理工大学广州510641 广州市建筑集团有限公司广州510030

针对知识城南方医院(九龙新城综合医院)项目直线加速器机房结构体量大、墙板厚度大、抗渗抗裂要求高的特点,研究总结出一套大体积重晶石纤维混凝土施工工艺。对重晶石防辐射纤维混凝土的配合比设计、高大模板及支撑体系设计和施工、大... 详细信息

针对知识城南方医院(九龙新城综合医院)项目直线加速器机房结构体量大、墙板厚度大、抗渗抗裂要求高的特点,研究总结出一套大体积重晶石纤维混凝土施工工艺。对重晶石防辐射纤维混凝土的配合比设计、高大模板及支撑体系设计和施工、大体积重晶石混凝土浇筑、大体积混凝土温度控制和养护等关键技术进行总结分析,表明该施工工艺具有良好的可操作性,可为其他相关工程提供借鉴。

关键词：直线加速器机房重晶石大体积混凝土施工技术

维普期刊数据库博看期刊

Underlying reasons and factors associated with changes in earthworm activities in response to biochar amendment:a review

在线全文

学校读者我要写书评

暂无评论

Biochar 2023年第1期5卷 1360-1376页

作者： Jiaqi Cui Jun Jiang E.Chang Feng Zhang Lingyu Guo di fang Renkou Xu Yujun Wang State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesP.O.Box 821Nanjing 210008China College of Resources and Environmental Sciences Nanjing Agriculture UniversityNanjing 210095China Institute of Information Science and Technology Southeast UniversityNanjing 210096China

Numerous studies have unequivocally demonstrated that biochar and,to a lesser degree,earthworms can independently improve soil fertility and crop productivity,although information about their co-application effects on soil characteristics is *** this review,(1)earthworm biomarkers and underlying influencing factors,as well as the changes in the amended soil quality in response to co-application of earthworms and biochar are presented,(2)the functional interactions between earthworms and biochar in soil are summarized;(3)the principles governing the synergetic effects of biochar and earthworms on soil quality enhancement are probed;and(4)alternative strategies to optimize the efficacy of earthworm and biochar amendments are *** is noteworthy that while low doses of biochar can have a positive effect on various earthworm biomarkers,including growth and reproduction,restoration of the intestinal environment,and the mitigation of cellular organelle toxicity and genetic damage,high biochar dosages can yield adverse ***,earthworms play a crucial role in distributing biochar particles deeper into the soil matrix,bolstering carbon sequestration potential,and enhancing the persistence and efficiency of biochar ***,earthworms stimulate the production of soil extracellular enzymes by microorganisms,which are pivotal to the processing,stabilization,and decomposition of soil organic matter,as well as nutrient cycling in terrestrial ***,they enhance the binding affinities of these enzymes to ***,changes in earthworm biomarkers in response to biochar integration are predominately governed by biochar properties and dosage,contact time,and soil type.

关键词： Biochar Earthworm Earthworm biomarkers Soil health Soil fertility