检索结果-南通市图书馆

THE IMPROVED XINANJIANG MODEL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2005年第6期17卷 746-751页

作者： LI zhi-jia YAO Cheng kong Xiang-guang College of Water Resources and Environment Hohai University Nanjing 210098 China Yi Shu Si River Water Resources Bureau Xuzhou 221009 China

To improve the Xinanjiang model, the runoff generating from infiltration excess is added to the model. The another 6 parameters are added to Xinanjiang model. In prin ciple, the improved Xinanjiang model can be used to simulate runoff in the humid, semi-humid and also semi-arid regions. The application in Yi River shows the improved Xinanjiang model could forecast discharge with higher acetrracy and can satisfy the practical requirements,It also shows thai the improved model is reasonable.

关键词： improved Xinanjiang model excess infiltration area of runoff model of infiltration

A diagnostic of the orbital spectrum of LS 5039 with Fermi-LAT

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第12期19卷 281-286页

作者： zhi Chang Shu Zhang Yu-Peng Chen Long Ji Ling-Da kong Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBejjing 100049China University of Chinese Academy of Sciences Beijing 100049China Institut fur Astronomie und Astrophysik Kepler Center for Astro and Particle PhysicsEberhard Karls UniversitatSand 172076 TibingenGermany

LS 5039 is a well-known γ-ray binary system which consists of an unknown compact object and a massive companion O star. It shows rather stable emissions at high energies over years and hence serves as an ideal laboratory to investigate the emission mechanism for such peculiar systems which emit prominent γ-rays. To this end, we take the orbital phase resolved energy spectrum as observed by Fermi-LAT over 10 years. We divide the orbit into four orbital phases, each with an orbital phase range of 0.25,centered at 0.00, 0.25, 0.50 and 0.75 respectively, where the phase 0.0 is the periastron and phase 0.5 is the apastron. The phases around 0.25 and 0.75 are symmetric and hence are supposed to have identical local acceleration environment. The spectral analysis shows that the Fermi-LAT spectra are largely different from these two symmetric orbital phases: the emission from orbital phase 0.25 turns out to be significantly stronger than that from 0.75. This result does not fit a scenario that γ-rays are Doppler boosted emission from bow shock tails if LS 5039 has a shock configuration similar to PSR B1259-63, and indicates that the inverse Compton scatterings between the shock accelerated plasma and the stellar particle environment is the underline procedure. We also find that the previous report for a disappearance of the orbital modulation at 3–20 GeV is due to the similar spectral turn-over energies of the different orbital phases. The spectral properties of periastron and apastron regions are addressed in the context of the measurements in phase regions around 0.25 and 0.75.

关键词： binaries:general gamma rays:general

Synchrotron-based infrared microspectroscopy under high pressure:An introduction

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2021年第6期6卷 67-85页

作者： Lingping kong gang Liu Center for High Pressure Science and Technology Advanced Research Shanghai 201203China

Synchrotron sources with high photon flux,small source size,and broad energy range have revolutionized ultrafine characterization of condensed *** the addition of the pressure dimension realized by the use of diamond anvil cells,enormous progress has been achieved throughout high-pressure *** is particularly so for synchrotron-based infrared microspectroscopy(SIRMS)with its very high signal-tonoise ratio,high spatial resolution,and extended measurement *** has high sensitivity,providing a platform for the investigations of the very small amounts of material that need to be used in high-pressure *** review summarizes developments in SIRMS,focusing on instrumentation and high-pressure *** to measurements of infrared reflectance and absorption are presented,illustrating how SIRMS results play a crucial role in advancing understanding of the crystalline phase transitions,electronic transitions,metallization,lattice dynamics,superconductivity,and novel functional *** insights into spectroscopic properties,together with some cutting edge issues and open problems,are also briefly discussed.

关键词： transitions spectroscopy infrared

A Low Cost, Green Sustainable and Biodegradable Biomass-based Fluorine-free Water and Oil Repellent

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第4期42卷 480-491页

作者： zhi-Wei Shen Shu-Feng Hu Chen Zeng Wei-Qing kong Mei-Fang Zhu State Key Laboratory for Modification of Chemical Fibers&Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510630China

With the global ban on plastics intensifying, the substitution of plastic with paper has garnered increasing attention. However, the inadequate water and oil repellency of pulp molding hinders its practical applications. Currently, the common method to enhance the oil and water repellency of pulp molding is by adding fluorinated water and oil repellents. Nevertheless, fluorinated compounds are environmentally and physiologically harmful. Therefore, the development of fluorine-free, water and oil repellent alternatives is crucial. In this study, chitosan and stearic acid were utilized as the first and second layers of the oil and water repellent coatings, respectively. The coated samples exhibited favorable water repellency, with a water contact angle of 116.4°, and excellent oil repellency, achieving a 12/12 rating on the kit scale. Importantly, the samples did not exhibit any leakage after being soaked in hot water and hot oil at 95±5℃ for 30 min, demonstrating remarkable performance as a barrier against hot water and oil. Moreover, the coated samples displayed outstanding mechanical properties, thermal stability, biodegradability, and recyclability. The approach presented in this study is simple, cost-effective, environmentally friendly, and represents a promising technique for producing fluoride-free, oil-and water-resistant pulp molding products.

关键词： Biomass Fluoride-free Oil-andwater-resistant Plasticfree

Characterization and photocatalytic properties of silver and silver chloride doped TiO_2 hollow nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2012年第12期23卷 1399-1402页

作者： Ping Li Ji Xiang Zheng kong Jin gang Wang Xiao Li Zhu College of Chemistry and Chemical Engineering University of Jinan

Using polystyrene （PSt） particles as template, PSt/TiO2 composite particles with AgCl incorporation were prepared through hydrolysis of tetrabutyl titanate in the presence of AgNO3 and NaCl. AgCl doped TiO2 hollow particles were successfully prepared with the PSt/TiO2 composite microspheres pretreated at 180 ℃ followed by calcination. The morphology of PSt/TiO2 particles and the crystal structures of the AgCl doped TiO2 hollow particles were characterized. The photocatalytic activity of the doped TiO2 hollow particles in degradation of Rhodamine B was tested under UV and visible lights and compared to that with Ag doped TiO2 particles. The results showed that TiO2 hollow particles, either doped with Ag or AgCl, demonstrated higher photocatalytic activity than the pure TiO2 particles. This enhancement in photocatalytic activity was more significant with AgCl doped TiO2 than that with Ag doped, and more distinct when the degradation was done under visible light than that under UV light.

关键词： TiO2 hollow particles AgCl doping Photocatalysis Light absorption shifting Rhodamine B degradation

Inside-out dual-doping effects on tubular catalysts:Structural and chemical variation for advanced oxygen reduction performance

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第1期15卷 361-367页

作者： Yang Gao Debin kong Jiaxu Liang Daliang Han Bin Wang Quan-Hong Yang Linjie zhi CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China University of Chinese Academy of Sciences Beijing 100049China

Dual-doping of carbon,especially the combination of nitrogen and a secondary heteroatom,has been demonstrated efficient to optimize the oxygen reduction reaction(ORR)***,the optimum dual-doping is still not clear due to the lack of strong experimental proofs,which rely on a reliable method to prepare carbon materials that can rule out the interference factors and then emphasize only the doping *** this work,an inside-out doping method is reported to prepare carbon submicrotubes(CSTs)as a material to study the principles of designing dual-doping catalysts for *** interference factors including the metal impurities and doping gradient in the bulk phase are excluded,and the doping effects including the structural and chemical variation of carbon are studied.P-doping exhibited a higher pore-forming ability to perforate carbon and a lower doping content,but a higher ORR catalytic activity as compared with S-and B-doped N-CSTs,demonstrating the N,P co-doping is more efficient in making carbon-based catalysts for ***-principle calculations reveal that the edge C situated around the oxidized P site nearby a graphitic N atom is the active site that shows the lowest ORR overpotential comparable to Pt-based *** study suggests that the catalytic activity of dual-heteroatoms-doped carbons not only depends on the intrinsic chemical bonding between heteroatoms and carbon,but also is affected by the structural variation generated by introducing different atoms,which can be extended to the study of other kinds of functionalization of carbon and potential reactions besides ORR.

关键词： dual-doping phosphorus carbon tubes oxygen reduction metal-free catalysts

Thermomechanical properties of an energy micro pile-raft foundation in silty clay

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

Underground Space 2021年第1期6卷 76-84页

作者： gang-qiang kong Te Cao Yao-hu Hao Yang Zhou Lian-wei Ren College of Civil and Transportation Engineering Hohai UniversityNanjingJiangsu 210098China Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education China Three Gorges UniversityYichangHubei 443002China Shanxi Transportation Research Institute TaiyuanShanxi 030006China School of Civil Engineering Henan Polytechnic UniversityJiaozuoHenan 454000China

Micro steel pipe pile was used for existing foundation reinforcement and *** energy micro pile-raft foundation equipped with heat exchange tube was constructed in silty *** diameter and the length of the energy micro pile are 160 mm and 13.0 m,respectively.A series of in situ thermal performance tests were carried out by controlling cycle heating,in which the inlet and outlet water temperatures,flow rate,and thermomechanical properties of the energy micro pile were *** with a numerical simulation method,the thermomechanical stresses and displacement of the raft were also analyzed and *** energy micro pile-raft foundation was also analyzed for different combinations of energy piles and nonenergy piles in the *** show that the micro pile-raft foundation can provide sufficient heat exchange compared with other types of ground heat *** settlement at both the pile top and tip were observed for the groups that contained both energy piles and nonenergy piles.

关键词： Energy pile Micro pile-raft foundation Thermomechanical properties Silty clay Field test

Effect of w(MgO)/w(Al_(2)O_(3)) ratio and basicity on microstructure and metallurgical properties of blast furnace slag

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 Iron and Steel Research International 2021年第10期28卷 1223-1232页

作者： Wei-guo kong Ji-hui Liu Yao-wei Yu Xin-mei Hou zhi-jun He School of Materials and Metallurgy University of Science and Technology LiaoningAnshan114051LiaoningChina State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai200444China

The CaO–SiO_(2)–Al_(2)O_(3)–MgO system is the main component unit in the slag formation process in blast furnace *** structural changes directly affect the high-temperature metallurgical properties of *** dynamics simulations were thus conducted to analyze the microstructure changes of the quaternary slag system under different basicities and w(MgO)/w(Al_(2)O_(3))*** changes in w(MgO)/w(Al_(2)O_(3))ratio and basicity could affect the stability of each *** the basicity and w(MgO)/w(Al_(2)O_(3))ratio,the average coordination number of O surrounding Si atom only changed a little and remained approximately 4,indicating that Si exists as a stable structure of the[SiO4]4−tetrahedron in the slag structure,while the average coordination number of O surrounding Al atom changed greatly from 4 to 6,which indicated that the Al existence form could be transformed from[AlO_(4)]^(5−) tetrahedron to[AlO_(5)]^(7−) pentahedron and[AlO_(6)]^(9−) ***,the diffusion rate of ions was accelerated with the increase in w(MgO)/w(Al_(2)O_(3))ratio and ***,the self-diffusion coefficients of each ion were obtained,and the magnitudes were observed to be in the following order:Mg^(2+)>Ca^(2+)>Al^(3+)>Si^(4+).The calculation and analysis of the slag viscosity and activation energy of viscous flow under different basicities and w(MgO)/w(Al_(2)O_(3))ratios revealed that the metallurgical properties of slag at high temperature depend on the flow-unit diffusivity and the microstructure stability,simultaneously,the basicity should be controlled between 1.0 and 1.2,and the w(MgO)/w(Al_(2)O_(3))ratio could be controlled between 0.45 and 0.55.

关键词： Blast furnace slag Microstructure Basicity w(MgO)/w(Al_(2)O_(3))ratio Molecular dynamics

Improved performances of lithium disilicate glass-ceramics by seed induced crystallization

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 Advanced Ceramics 2021年第3期10卷 614-626页

作者： Ting ZHAO Mei-Mei LIAN Yi QIN Jian-Feng ZHU Xin-gang kong Jian-Feng YANG School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

Self-reinforced lithium disilicate(Li_(2)Si_(2)O_(5),LD)glass-ceramics were hot pressing sintered by introducing 5 wt%Li_(2)Si_(2)O_(5)crystal seeds into two different glass compositions of SiO_(2)-Li_(2)O-P2O_(5)-ZrO_(2)-Al_(2)O_(3)-K_(2)O-La_(2)O_(3)(7C LD)and SiO_(2)-Li_(2)O-K_(2)O-La_(2)O_(3)(4C LD).The results show that the seeds play an important role in the crystallization inducement,and microstructural and property improvement of the glass,especially for the glass powder without the nucleating agent of P_(2)O_(5).The microstructure features a wider bimodal grain size distribution with large rod-like crystals epitaxially grown along the seeds and small crystals nucleated from the glass powder itself,contributing to the improvement of the performance especially the fracture *** specimen of 4C LD glass with the addition of 5 wt%Li_(2)Si_(2)O_(5) seeds exhibited the best comprehensive properties with a good flexural strength(396±7 MPa),improved fracture toughness(3.31±0.19 MPa·m^(1/2)),and comparable translucency as IPS *** research provides a new idea and method for the improvement of the fracture toughness of lithium disilicate glass-ceramics without affecting its aesthetic appearance,and lays the foundation for its clinical applications.

关键词： lithium disilicate(LD) seeds mechanical properties translucency