检索结果-南通市图书馆

Decomposition of CFC and Halon waste gases in normal-pressure plasma reactors

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 1999年第1期11卷 86-89页

作者： Hou Jian, Sun Wei ming, Li Chao min, Wang shu hui, Hou hui qi Environmental Science Institute, Fudan University, Shanghai 200433, China

The normal pressure decomposition of CF 2Cl 2 and CF 2ClBr in air by non equilibrium plasma was studied. The pressure of CF 2Cl 2 and CF 2ClBr was 2.67×10 3Pa, added the dry air to 1.01×10 5 Pa, discharged by corona or DBD, 11.5% of CF 2ClBr was decomposed by corona after 120s discharge, more than 85% of CF 2Cl 2 and 95% of CF 2ClBr were decomposed by DBD after 10s discharge respectively. The main products were CF 2O, Cl 2 and Br 2.

关键词： decomposition CFC Halon normal pressure plasma.

Accurate quantification of the algebraic,multiplicative algebraic,and simultaneous iterative reconstruction techniques in ionosphere rebuilding based on the TIEGCM assessment

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2025年第1期9卷 117-126页

作者： Ao qi HaiBing Ruan Institute of Space Weather Nanjing University of Information Science and TechnologyNanjing 210044China Key Laboratory of Geospace Environment University of Science&Technology of ChinaChinese Academy of SciencesHefei 230026China

The algebraic reconstruction technique(ART),multiplicative algebraic reconstruction technique(MART),and simultaneous iterative reconstruction technique(SIRT)are computational methodologies extensively utilized within the field of computerized ionospheric tomography(CIT)to facilitate three-dimensional reconstruction of the ionospheric ***,reconstruction accuracy elicits recurrent disputes over its practical application,and people usually attribute this issue to incomplete and uneven coverage of the *** Thermosphere Ionosphere Electrodynamics General Circulation Model(TIEGCM)offers a reasonable physics-based ionospheric background and is widely utilized in ionospheric *** use the TIEGCM simulations as the targeted ionosphere because the current measurements are far from able to realistically reproduce the ionosphere in *** designations of satellite measurements are conducted to investigate the limiting performance of CIT methods in ionospheric *** to common practice,electron density distributions from outputs of the International Reference Ionosphere(IRI)model are used as the iterative initial value in CIT *** outcomes suggest that despite data coverage,iterative initial conditions also play an essential role in ionospheric *** particular,in the longitudinal sectors where the iterative initial height of the F2-layer peak electron density(hmF2)differs substantially from the background densities,none of the three CIT methods can reproduce the exact background *** hmF2 is close but the ionospheric F2-layer peak density(NmF2)is different between the targeted background and initial conditions,the MART performs better than the ART and SIRT,as evidenced by the correlation coefficients of MART being above 0.97 and those of ART and SIRT being below *** summary,this investigation reveals the potential uncertainties in traditional CIT reconstruction,particularly when reali

关键词： computerized ionospheric tomography International Reference Ionosphere model Thermosphere Ionosphere Electrodynamics General Circulation model ionosphere

农户参与农村公共休闲产品筹资意愿研究——以福建省南平地区为例

在线全文

学校读者我要写书评

暂无评论

合肥学院学报（综合版） 2017年第3期34卷 20-25页

作者：周书成林慧琦郑逸芳福建农林大学公共管理学院福州350002

运用福建省南平市16个乡镇的37个村174位农户问卷调查数据分析,农户参与农村公共休闲产品筹资意愿及其影响因素。研究表明:公共休闲产品资金使用透明程度、参与农村公共休闲产品供给决策意愿、家庭收入水平、政府支持程度这4个因素对于... 详细信息

运用福建省南平市16个乡镇的37个村174位农户问卷调查数据分析,农户参与农村公共休闲产品筹资意愿及其影响因素。研究表明:公共休闲产品资金使用透明程度、参与农村公共休闲产品供给决策意愿、家庭收入水平、政府支持程度这4个因素对于农户参与农村公共休闲产品的筹资意愿具有显著影响。结果提出,为完善农村公共休闲产品的建设,政府在为农村谋发展的同时还应增加工作透明度,让农户了解政府对农村发展所提供包括资金、政策等在内的各项支持政策;村集体应充分利用一事一议等制度给予农户参与公共休闲产品建设的相关决策权,同时做好财务公开工作。

关键词：农户参与公共休闲产品筹资

Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 385-396页

作者： Mingming Zhang Hanyu Wu qi Chen Jiaxin Yang Bonan Liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of NH3/O2and the production of N2/H2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of NH3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for OH and O（1S）.However,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

关键词： Nanosecond pulsed discharge Ammonia Oxidative pyrolysis Fluid model Global model

Electrocatalytic cleavage of a lignin β-O-4 model compound and coupling with nitrogen-containing aromatics using Prussian blue analogue-derived nickel–cobalt spinel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 628-636页

作者： Yi qi Xueying Chen Bowen Liu Xuliang Lin Xueqing qiu Yanlin qin Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light Industry Guangdong University of Technology Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Guangdong Basic Research Center of Excellence for Ecological Security and Green Development Guangdong University of Technology

Electrochemical conversion of lignin for the production of high-value heterocyclic aromatic compounds has great *** demonstrate the targeted synthesis and cation modulation of NiCo2O4spinel nanoboxes,synthesized via cation exchange and calcination *** catalysts exhibit excellent efficacy in the electrocatalytic conversion of lignin model compounds,specifically 2-phenoxy-1-phenylethanol,into nitrogen-containing aromatics,achieving high conversion rates and *** catalysts were synthesized via a cation exchange and calcination oxidation process,using Prussian blue nanocubes as *** porous architecture and polymetallic composition of the NiCo2O4spinel demonstrated superior performance in electrocatalytic oxidative coupling,achieving a 99.2 wt%conversion rate of the 2-phenoxy-1-phenylethanol with selectivities of 37.5 wt%for quinoline derivatives and 31.5 wt%for *** innovations include the development of a sustainable one-pot synthesis method for quinoline derivatives,the elucidation of a multistage reaction pathway involving CAO bond cleavage,hydroxyaldol condensation,and CAN bond formation,and a deeper mechanistic understanding derived from DFT *** work establishes a new strategy for lignin valorization,offering a sustainable route to produce high-value nitrogen-containing aromatics from renewable biomass under mild conditions,without the need for additional reagents.

关键词： Spinel Biomass valorization Electrocatalysis Lignin oxidation Coupling

A new iron(Ⅲ) chelator of coprogen-type siderophore from the deep-sea-derived fungus Mycosphaerella sp. SCSIO z059

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2020年第4期18卷 243-249页

作者： HUANG Zhong-hui LIANG Xiao qi shu-Hua CAS Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Key Laboratory of Marine Materia MedicaInstitution of South China Sea Ecology and Environmental EngineeringSouth China Sea Institute of OceanologyChinese A cademy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China

Mycosphazine A(1), a new iron(Ⅲ) chelator of coprogen-type siderophore, and mycosphamide A(2), a new cyclic amide benzoate, together with six known aryl amides(3-8), were isolated from the fermentation broth of the deep-sea-derived fungus Mycosphaerella sp. SCSIO z059. Alkaline hydrolysis of 1 afforded a new epimer of dimerum acid, mycosphazine B(1 a), and a new bi-fusarinine-type siderophore, mycosphazine C(1 b). The planar structures of the new compounds were elucidated by extensive spectroscopic data analysis. The absolute configurations of amino acid residues in 1 a and 1 b were determined by acid hydrolysis. And the absolute configuration of 2 was established by quantum chemical calculations of the electronic circular dichroism(ECD) spectra. Compound 1 is the first siderophore-Fe(Ⅲ) chelator incorporating both L-ornithine and D-ornithine unites. Compounds 3-8 were reported as natural products for the first time, and the 1 H and 13 C NMR data of 6 and 8 were assigned for the first time. Compounds 1 and 1 a could greatly promote the biofilm formation of bacterium Bacillus amyloliquefaciens with the rate of about 249% and 524% at concentration of 100 μg·mL-1, respectively.

关键词： Deep-sea-derived fungus Mycosphaerella sp Iron(Ⅲ)chelator Coprogen-type siderophore Cyclic amide Biofilm formation

Effects of Total Saponins from Dioscorea Nipponica Makino on Monosodium Urate-Induced M1-Polarized Macrophages through Arachidonic Acid Signaling Pathway:An in vitro Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2023年第1期29卷 44-51页

作者： ZHOU qi SUN hui-juan LIU shu-min Research Institute of Chinese Medicine Heilongjiang University of Chinese MedicineHarbin150040China Graduate School Heilongjiang University of Chinese MedicineHarbin150040China Technological Innovation Team of Basic Theory Study Research of Institution of Higher Education in Heilongjiang Province Heilongjiang University of Chinese MedicineHarbin150040China

Objective To investigate and reveal the underlying mechanism of the effect of total saponins from Dioscoreae nipponica Makino(TSDN)on the arachidonic acid pathway in monosodium urate(MSU)crystal-induced M1-polarized *** M1 polarization of RAW264.7 cells were induced by 1µg/mL lipopolysaccharide(LPS).The methylthiazolyldiphenyl-tetrazolium bromide method was then used to screen the concentration of ***(500µg/mL)was used to induce the gouty arthritis ***,10µg/L TSDN and 8µmol/L celecoxib,which was used as a positive control,were added to the above LPS and MSU-induced cells for 24 *** mRNA and protein expressions of cyclooxygenase(COX)2,5-lipoxygenase(5-LOX),microsomal prostaglandin E synthase derived eicosanoids(mPGES)-1,leukotriene B(LTB)4,cytochrome P450(CYP)4A,and prostaglandin E_(2)(PGE_(2))were tested by real-time polymerase chain reaction and Western blotting,*** enzyme-linked immunosorbent assay was used to test the contents of M1 markers,including inducible nitric oxid synthase(NOS)2,CD80,and *** TSDN inhibited the proliferation of M1 macrophages and decreased both the mRNA and protein expressions of COX2,5-LOX,CYP4A,LTB4,and PGE_(2)(P<0.01)while increased the mRNA and protein expression of mPGES-1(P<0.05 or P<0.01).TSDN could also significantly decrease the contents of NOS2,CD80,and CD86(P<0.01).Conclusion TSDN has an anti-inflammation effect on gouty arthritis in an in vitro model by regulating arachidonic acid signaling pathway.

关键词： gouty arthritis Dioscorea nipponica Makino arachidonic acid signaling pathway M1/M2 polarization

Asymptotic false discovery control of the Benjamini-Hochberg procedure for pairwise comparisons

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2025年第1期 223-252页

作者： Weidong Liu Dennis Leung qi-Man Shao School of Mathematical Sciences Shanghai Jiao Tong University School of Mathematics and Statistics University of Melbourne Department of Statistics and Data Science SICMSouthern University of Science and Technology

In a one-way analysis-of-variance(ANOVA) model,the number of pairwise comparisons can become large even with a moderate number of *** by this,we consider a regime with a growing number of groups and prove that,when testing pairwise comparisons,the Benjamini-Hochberg(BH) procedure can asymptotically control false discoveries,despite the fact that the involved t-statistics do not exhibit the wellknown positive dependence structure required for exact false discovery rate(FDR) *** Tukey's perspective that the difference between the means of any two groups cannot be exactly zero,our main result provides control over the directional false discovery rate and directional false discovery proportion.A key technical contribution of our work is demonstrating that the dependence among the t-statistics is sufficiently weak to establish the convergence result typically required for asymptotic FDR *** analysis does not rely on conventional assumptions such as normality,variance homogeneity,or a balanced design,thereby offering a theoretical foundation for applications in more general settings.

关键词：

同方期刊数据库

先简支后连续25 m小箱梁施工关键技术研究

在线全文

学校读者我要写书评

暂无评论

山东交通科技 2017年第2期 61-62,72页

作者：陶振营商淑杰齐辉闫翔鹏山东通惠交通工程咨询有限公司山东济南250100 山东华鉴工程检测有限公司山东济南250102 中咨公路养护检测技术有限公司北京100093 山东省交通科学研究院山东济南250031

从张拉方法、结构型式和截面形式三个方面进行对比,通过方案对比,确定25 m跨径的桥梁适合采用先简支后连续的预应力混凝土小箱梁。结合实际工程案例,阐述了25 m预应力混凝土先简支后连续小箱梁桥的施工工艺。

关键词：预应力混凝土箱梁先简支后连续施工工艺关键技术