检索结果-南通市图书馆

Synthesis and kinetics of 2,5-dicyanofuran in the presence of hydroxylamine ionic liquid salts

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

Chinese Journal of Chemical Engineering 2023年第1期53卷 310-316页

作者： xuan gao Zhihui Li Dongsheng Zhang Xinqiang Zhao Yanji Wang Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving Hebei University of TechnologyTianjin 300130China School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300130China

2,5-Dicyanofuran(DCF)is an important biomass-derived platform compound primarily used to prepare bio-based adiponitrile,which is the key precursor for the synthesis of nylon 66 and 1,6-hexanediisocyanate(HDI).In this study,one-pot,green and safe synthesis of DCF from 2,5-diformylfuran(DFF)and hydroxylamine ionic liquid salts was ***-friendly hydroxylamine ionic liquid salts were used as the nitrogen *** liquid exhibited three-fold function of cosolvent,catalysis and phase *** conversion of DFF and yield of DCF reached 100%under the following optimum reaction conditions:temperature of 120℃ for 70 min,volume ratio of paraxylene:[HSO_(3)-b-Py]HSO4 of 2:1,and molar ratio of DFF:(NH_(2)OH)_(2)[HSO_(3)-b-Py]HSO4 of 1:*** reaction mechanism for the synthesis of DCF was proposed,and the kinetic model was *** reaction order with respect to DFF and intermediate product 2,5-diformylfuran dioxime(DFFD)was 1.06 and 0.16,and the reaction activation energy was 64.07 kJ·mol^(-1) and 59.37 kJ·mol^(-1) *** the reaction,the ionic liquid was easy to separate,recover and recycle.

关键词： 2,5-Dicyanofuran Hydroxylamine ionic liquid salts Green synthesis Kinetics

Electromagnetic scattering of charged particles in a strong wind-blown sand electric field

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第3期28卷 218-222页

作者： Xingcai Li xuan gao Juan Wang School of Physics and Electronic-Electrical Engineering Ningxia UniversityYinchuan 750021China Ningxia Key Laboratory of Intelligent Sensing for the Desert Information Ningxia UniversityYinchuan 750021China Xinhua College Ningxia UniversityYinchuan 750021China

Some field experimental results have shown that the moving sands or dust aerosols in nature are usually electrified,and those charged particles also produce a strong electric field in air, which is named as wind-blown sand electric *** scholars have pointed out that the net charge on the particle significantly enhances its electromagnetic(EM) extinction properties, but up to now, there is no conclusive research on the effect of the environmental electric field. Based on the extended Mie theory, the effect of the electric field in a sandstorm on the EM attenuation properties of the charged larger dust particle is studied. The numerical results indicate that the environmental electric field also has a great influence on the particle's optical properties, and the stronger the electric field, the bigger the effect. In addition, the charged angle, the charge density, and the particle radius all have a specific impact on the charged particle's optical properties.

关键词： wind-blown sand electric field extended Mie theory charged particle scattering

Real-space observation on standing configurations of phenylacetylene on Cu(111) by scanning probe microscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第6期28卷 338-342页

作者： Jing Qi Yi-xuan gao Li Huang Xiao Lin Jia-Jia Dong Shi-xuan Du Hong-Jun gao Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Key Laboratory of Organofluorine Chemistry Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China

The adsorption configurations of molecules adsorbed on substrates can significantly affect their physical and chemical properties. A standing configuration can be difficult to determine by traditional techniques, such as scanning tunneling microscopy(STM) due to the superposition of electronic states. In this paper, we report the real-space observation of the standing adsorption configuration of phenylacetylene on Cu(111) by non-contact atomic force microscopy(nc-AFM).Deposition of phenylacetylene at 25 K shows featureless bright spots in STM images. Using nc-AFM, the line features representing the C–H and C–C bonds in benzene rings are evident, which implies a standing adsorption configuration. Further density functional theory(DFT) calculations reveal multiple optimized adsorption configurations with phenylacetylene breaking its acetylenic bond and forming C–Cu bond(s) with the underlying copper atoms, and hence stand on the *** comparing the nc-AFM simulations with the experimental observation, we identify the standing adsorption configuration of phenylacetylene on Cu(111). Our work demonstrates an application of combining nc-AFM measurements and DFT calculations to the study of standing molecules on substrates, which enriches our knowledge of the adsorption behaviors of small molecules on solid surfaces at low temperatures.

关键词： phenylacetylene adsorption configuration scanning probe microscopy density functional theory

Structural optimization strategy of pipe isolation tool by dynamic plugging process analysis

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2021年第6期18卷 1829-1839页

作者： Ting-Ting Wu Hong Zhao Bo-xuan gao Fan-Bo Meng College of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China

During the pipeline plugging process,both the pipeline and the pipe isolation tool(PIT)will be greatly damaged,due to the violent vibration of the flow *** this study,it was proposed for the first time to reduce the vibration of the flow field during the plugging process by optimizing the surface structure of the ***,the central composite design(CCD)was used to obtain the optimization schemes,and the drag coefficient and pressure coefficient were proposed to evaluate the degree of flow field ***,a series of computational fluid dynamics(CFD)simulations were performed to obtain the drag coefficient and pressure coefficient during dynamic *** the mathematical model of drag coefficient and pressure coefficient with the surface structure of the PIT were established ***,a modified particle swarm optimization(PSO)was applied to predict the optimal value of the surface structure of the ***,an experimental rig was built to verify the effectiveness of the *** results showed that the improved method could reduce the flow field vibration by 49.56%.This study provides a reference for the design of the PIT surface structure for flow field vibration technology.

关键词： Pipe isolation tool Dynamic analysis Drag coefficient Pressure coefficient Modified particle swarm optimization algorithm

Cu^2+-catalyzed mechanism in oxygen-pressure acid leaching of artificial sphalerite

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 910-923页

作者： Lei Tian Ao Gong xuan-gao Wu Yan Liu Zhi-feng Xu Ting-an Zhang Institute of Green Metallurgy and Process Intensification Jiangxi University of Science and TechnologyGanzhou 341000China Guangdong Institute of Resources Comprehensive Utilization Guangzhou 510000China State Key Laboratory of Rare Metals Separation and Comprehensive Utilization Guangzhou 510000China Key Laboratory for Ecological Utilization of Multimetallic Mineral Ministry of EducationNortheastern UniversityLiaoning 110819China

The potential autoclave was used to study the catalytic mechanism of Cu^2+during the oxygen pressure leaching process of artificial *** studying the potential change of the system at different temperatures and the SEM–EDS difference of the leaching residues,it was found that in the temperature range of 363–423 K,the internal Cu^2+formed a Cu S deposit on the surface of sphalerite,which hindered the leaching reaction,resulting in a zinc leaching rate of only 51.04%.When the temperature exceeds 463 K,the system potential increases *** increase in temperature leads to the dissolution of the CuS,which is beneficial to the circulation catalysis of Cu^2+.At this time,the leaching rate of Zn exceeds 95%.In addition,the leaching kinetics equations at 363–423 and 423–483 K were *** activation energy of zinc leaching at 363–423 and 423–483 K is 38.66 and 36.25 kJ/mol,respectively,and the leaching process is controlled by surface chemical reactions.

关键词： sphalerite electric potential autoclave copper(II)ions catalyst kinetics activation energy apparent reaction order

利用原子在圆偏振激光场中的强场电离产生自旋极化电子

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第3期42卷 101-109页

作者：王中元高轩鸿景文泉杜进旭赵松峰西北师范大学物理与电子工程学院兰州730070

圆偏振激光场中原子的非绝热强场电离为产生自旋极化电子提供了机会.我们应用这些解析电离速率公式[Ingo Barth and Olga Smirnova,***.A 88,013401(2013)]更系统地研究了通过Kr和Xe原子在右旋圆偏振激光脉冲中的强场电离产生自旋极化电... 详细信息

圆偏振激光场中原子的非绝热强场电离为产生自旋极化电子提供了机会.我们应用这些解析电离速率公式[Ingo Barth and Olga Smirnova,***.A 88,013401(2013)]更系统地研究了通过Kr和Xe原子在右旋圆偏振激光脉冲中的强场电离产生自旋极化电子,并证实了不同自旋态的光电子能量分布有很大差异、电子的自旋极化敏感地依赖于光电子能量.另外,在光电子能谱的低能部分其自旋极化可以达到100%,并且通过调节激光强度和频率可以很好地控制能量积分的自旋极化.

关键词：自旋极化电子非绝热强场电离右旋圆偏振激光场

Overexpression of blueberry FLOWERING LOCUS T is associated with changes in the expression of phytohormone-related genes in blueberry plants

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2016年第1期3卷 59-67页

作者： xuan gao Aaron E Walworth Charity Mackie Guo-qing Song Department of Horticulture Plant Biotechnology Resource and Outreach CenterMichigan State UniversityEast LansingMI 48824USA Key Laboratory for the Conservation and Utilization of Important Biological Resources College of Life SciencesAnhui Normal UniversityWuhu 241000China

Flowering locus T(FT)is a primary integrator in the regulation of plant *** a blueberry(Vaccinium corymbosum L.)FT gene(VcFT)(herein VcFT-OX)resulted in early flowering and dwarfing in‘Aurora’plants(herein‘VcFT-Aurora’).In this study,we found that VcFT-OX reduced shoot regeneration from leaf *** investigate the potential roles of the phytohormone pathway genes associated with VcFT-OX,differentially expressed(DE)genes in leaf tissues of‘VcFT-Aurora’plants were annotated and analyzed using non-transgenic‘Aurora’plants as a *** DE floral genes,including the blueberry SUPPRESSOR of Overexpression of constans 1(VcSOC1)(gibberellin related),Abscisic acid responsive elements-binding factor 2(VcABF2)and protein related to ABI3/VP1(VcABI3/VP1)(ethylene-related),are present under both the phytohormone-responsive and the dwarfing-related Gene Ontology *** gene networks of the DE genes overall showed the molecular basis of the multifunctional aspects of VcFT overexpression beyond flowering promotion and suggested that phytohormone changes could be signaling molecules with important roles in the phenotypic changes driven by VcFT-OX.

关键词： Aurora dwarf blue

SimWall:a practical user-friendly stereo tiled display wall system

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

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第4期8卷 596-604页

作者： XIE Li-jun ZHENG Yao YANG Ting-jun gao Wen-xuan PAN Ning-he School of Computer Science and Center for Engineering and Scientific Computation Zhejiang University Hangzhou 310027 China

SimWall is a user-friendly, stereo tiled display wall system composed of 18 commodity projectors operated by a Linux graphics cluster. Collaborating together, these projectors work as a single logical display capable of giving a high-resolution show, large-scale, and passive stereo scene. In order to avoid tedious system setup and maintenance, software-based automatic geometry and photometric calibration are used. The software calibration is integrated to the system seamlessly by an on-card transform method and is transparent to users. To end-users, SimWall works just as a common PC, but provides super computing, rendering and displaying ability. In addition, SimWall has stereoscopic function that gives users a semi-immersive experience in polarized passive way. This paper presents system architecture, implementation, and other technical issues such as hardware constraints, projectors alignment, geometry and photometric calibration, implementation of passive stereo, and development of overall soft- ware environment.

关键词： Tiled display wall Stereoscopic display Multi-projectors display Parallel rendering Camera-based geometry and photometric calibration

Efficacy and safety of Di-Tan Decoction for treating post-stroke neurological disorders:a systematic review and Meta-analysis of randomized clinical trials

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2021年第5期19卷 339-350页

作者： Kwon Hyuk-Ku Zhang Ting Wu xuan gao Qiu Jing Yi Park Sunmin Dept of Environm ental EngineeringHoseo UniversityAsanSouth Korea Dept of Food and NutritionObesity/Diabetes Research CenterHoseo UniversityAsanSouth Korea

The management of post-stroke complications plays an important role in the quality of ***-Tan Decoction(DTD;涤痰汤)is a widely used traditional Chinese *** study incorporated systematic review and meta-analysis to evaluate the efficacy of DTD in post-stroke neurological *** clinical trials(RCTs)were searched from English,Chinese and Korean electronic medical databases,by including the keywords"Di-Tan Tang","Di-Tan Decoction","Scour Phlegm Decoction","stroke",and"*** RCT included control(placebo,conventional therapy,or Western medicine)and experimental(DTD treatment)*** patients inflicted with stroke for 1-6 weeks,the outcomes of post-stroke neurological disorders were measured by scales for post-stroke symptoms and were classified as"completely healed","markedly effective","effective"and"ineffective".Totally,11 RCTs(n=490 controls and n=502 DTD subjects)were selected from 210 articles identified in the initial search.A metaanalysis of evaluation criteria in post-stroke symptoms revealed that the overall odds ratio(ORs)for alleviating post-stroke neurological disorders were 0.30-fold lower(95%CI=0.21-0.43)in the DTD group than the control(Western medicine)group(P<0.00001).Moreover,regardless of the type of stroke diagnostic scale applied(including NFA,HDS,and NIHSS),the overall post-stroke symptoms determined were less severe in the DTD group(n=219)than the control group(n=217).No adverse effects of DTD were observed in the 11 RCTs *** 11 studies used an appropriate method for randomization of subjects to evaluate the risk of bias(ROB),and 7 studies included allocation concealment as well as blinding of patients and ***-risk ROB was included in6 *** significant publication bias was derived from the funnel *** results indicate that the administration of DTD alone,and DTD in combination with Western medicine,exert greater efficacy for post-stroke complication therapy,than Western medicine administ

关键词： Di-Tan Decoction Post-stroke Adverse effects Randomized clinical trials Risk of bias