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Vertical and temporal distribution of nitrogen and phosphorus and relationship with their influencing factors in aquatic-terrestrial ecotone:a case study in Taihu Lake,China

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Journal of Environmental Sciences 2007年第6期19卷 689-695页

作者： YANG Hong-jun SHEN zhe-min zhu Song-he WANG Wen-hua School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Vertical and temporal distributions of N and P in soil solution in aquatic-terrestrial ecotone （ATE） of Taihu Lake were investigated, and the relations among N, P, ORP （oxidation reduction potential）, TOC, root system biomass and microorganism were studied. As a whole, significant declines in TN, NO3^--N, DON （dissolved organic nitrogen） and TP concentration in soil solution have occurred with increase of the depth, and reached their minima at 60 cm depth, except for NH4^＋-N, which increased with depth. The concentration of TP increased gradually from spring to winter in the topsoil, the maximum 0.08 mg/L presented in the winter while the minimum 0.03 mg/L in spring. In the deeper layer, the concentration value of TP fluctuated little. As for the NO3^--N, its seasonal variation was significant at 20 cm depth, its concentration increased gradually from spring to autumn, and decreased markedly in winter. Vertical and temporal distribution of DON is contrary to that of NO3^--N. The results also show that the variation of N and P in the percolate between adjacent layers is obviously different. The vertical variation ofTN, TP, NO3^--N, NH4^＋-N and DON is significant, of which the variation coefficient of NO3^--N along the depth reaches 100.23%, the highest; while the variation coefficient of DON is 41.14%, the smallest. The results of correlation analysis show that the concentration of nitrogen and phosphorus correlate significantly with TOC, ORP, root biomass and counts of nitrifying bacteria. Most nutrients altered much from 20 to 40 cm along the depth. However, DON changed more between 60 and 80 cm. Results show that soil of 0-60 cm depth is active rhizoplane, with strong capability to remove the nitrogen and phosphorus in ATE. It may suggest that there exists the optimum ecological efficiency in the depth of above 60 cm in reed wetland. This will be very significant for ecological restoration and reestablishment.

关键词： aquatic-terrestrial ecotone (ATE) soil percolate vertical and temporal distribution coefficient of variation ecological efficiency

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A Facile Synthesis of Benzo[h]quinolines via Silica-TsOH-P2O5 Promoted Condensation of 1-Naphthylamines with 1,3-Diketones under Solvent Free Conditions

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Chinese Journal of Chemistry 2017年第10期35卷 1595-1600页

作者： Chuanlei zhu Ruiqiang Guo zhe Sheng Yanzhe Li Changhu Chu School of Pharmacy Shanghai Key Laboratory of New Drug Design East China University of Science and Technology Shanghai 200237 China

A facile synthesis of benzo[h]quinolines has been developed via improved Combes reaction. A combination of silica gel, p-toluenesulfonic acid and phosphorus pentoxide was utilized to promote the condensation of 1-naphthylamines with 1,3-diketones under solvent free conditions. In this case, silica gel was used as reaction media, p-toluenesulfonic acid and phosphorus pentoxide were acted as catalyst and dehydrating agent, respectively.

关键词： silica-TsOH-P2O5 benzo[h]quinoline catalysis synthesis solvent free

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A review of offshore wind farm layout optimization and electrical system design methods

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Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 975-986页

作者： Peng HOU Jiangsheng zhu Kuichao MA Guangya YANG Weihao HU zhe CHEN Center of Electrical Engineering Technical University of DenmarkLyngbyDenmark Department of Energy Technology Aalborg UniversityAalborgDenmark School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengduChina

There is more wind with less turbulence offshore compared with an onshore case,which drives the development of the offshore wind farm *** a huge amount of money is required for constructing an offshore wind farm,many types of research have been done on the optimization of the offshore wind farm with the purpose of either minimizing the cost of energy or maximizing the total energy *** are several factors that have an impact on the performance of the wind farm,mainly the energy production of wind farm which is highly decided bythe wind condition of construction area and micro-siting of wind turbines(WTs),as well as the initial investment which is influenced by both the placement of WTs and the electrical system design,especially the scheme of cable connection *** this paper,a review of the state-of-the-art researches related to the wind farm layout optimization as well as electrical system design including cable connection scheme optimization is *** most significant factors that should be considered in the optimization work of the offshore wind farm is highlighted after reviewing the latest works,and the future needs are specified.

关键词： Energy production Wake modelling Wind farm layout optimization Cable connection scheme optimization Offshore wind farm

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Flexible Ceramic Fibers: Recent Development in Preparation and Application

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Advanced Fiber Materials 2022年第4期4卷 573-603页

作者： Chao Jia zhe Xu Dianfeng Luo Hengxue Xiang Meifang zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Flexible ceramic fibers(FCFs)have been developed for various advanced applications due to their superior mechanical flexibility,high temperature resistance,and excellent chemical *** this article,we present an overview on the recent progress of FCFs in terms of materials,fabrication methods,and *** begin with a brief introduction to FCFs and the materials for preparation of *** that,various methods for preparation of FCFs are discussed,including centrifugal spinning,electrospinning,solution blow spinning,self-assembly,chemical vapor deposition,atomic layer deposition,and polymer *** applications of FCFs in various fields are further illustrated in detail,including thermal insulation,air filtration,water treatment,sound absorption,electromagnetic wave absorption,battery separator,catalytic application,among ***,some perspectives on the future directions and opportunities for the preparation and application of FCFs are *** envision that this review will provide readers with some meaningful guidance on the preparation of FCFs and inspire them to explore more potential applications.

关键词： Ceramic fibers Flexibility Preparation Applications

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Spintronic devices for neuromorphic computing

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Science China(Physics,Mechanics & Astronomy) 2020年第7期63卷 124-126页

作者： YaJun Zhang Qi zheng XiaoRui zhu zhe Yuan Ke Xia Center for Advanced Quantum Studies and Department of Physics Beijing Normal UniversityBejing 100875China Peng Cheng Laboratory Center for Quantum ComputingShenzhen 518005China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China

In the past decades,significant progress has been achieved in artificial intelligence,which is now widely applied in image recognition,big data analysis,unmanned vehicle control and other cognitive tasks[1].These applications nevertheless are highly energy consuming partly because of the mismatch between the neural-network-computing-based software im-plementation and the von Neumann architecture of present *** promising solution is developing neuro-morphic chips without the so-called von Neumann bottle-neck,which are suitable for performing the desired computation based on artificial neural networks(ANNs).

关键词： consuming desired computing

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Research on Improving the Thermal Conductivity of Epoxy Resin with Flexible Assisted rigid Groups

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Chinese Journal of Polymer Science 2024年第11期42卷 1845-1854,I0015页

作者： Hong-Yu zhu Yan-Ji zhu Di Bao Lu-Chao Pei Fei Xu zhe Wang Huai-Yuan Wang School of Materials Science and Engineering Tianjin UniversityTianjin300050China Collaborative Innovation Centre of Chemical Science and Engineering(Tianjin) Tianjin UniversityTianjin300072China Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology Tianjin UniversityTianjin300072China School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering Tianjin UniversityTianjin300350China

Epoxy resins are cross-linked polymeric materials with typically low thermal ***,the introduction of rigid groups into epoxy resins is the main method to improve their intrinsic thermal *** researchers explored the relationship between the flexible chains of epoxy monomers and the thermal conductivity of the modified epoxy resins(MEP).The effect of flexible chain length on the introduction of rigid groups into the cross-linked structure of epoxy is worth investigating,which is of great significance for the improvement of thermal conductivity of polymers and related *** prepared a small molecule liquid crystal(SMLC)containing a long flexible chain via a simple synthesis reaction,and introduced rigid mesocrystalline units into the epoxy resin via a curing *** high-temperature curing,the introduced mesocrystalline units underwent orientational stacking and were immobilized within the *** and TGA tests showed that the ordering within the modified epoxy resin was increased,which improved the thermal conductivity of the epoxy ***,during the above process,the flexible chains of SMLC provide space for the biphenyl groups to align and therefore affect the thermal conductivity of the ***,the MEP-Ⅵcured with SMLC-Ⅵcontaining six carbon atoms in the flexible chain has the highest thermal conductivity of 0.40W·m^(-1)·K^(-1),which is 125%of the thermal conductivity of SMLC-IV of 0.32 W·m^(-1)·K^(-1),111%of the thermal conductivity of SMLC-Ⅷof 0.36W·m^(-1)·K^(-1),and 182%of the thermal conductivity of pure epoxy of 0.22 W·m^(-1)·K^(-1).The introduction of appropriate length flexible chains for SMLC promotes the stacking of rigid groups within the resin while reducing the occurrence of chain *** study will provide new ideas for the enhancement of thermal conductivity of cross-linked polymeric materials.

关键词： Epoxy Resin Polymer Thermal conductivity rigid group Flexible chain

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Martensitic transformation and magnetic properties in Mn_(49-x)Cu_(x)Ni_(41)Sn_(10)(x=0-2)

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Rare Metals 2023年第7期42卷 2433-2438页

作者： Meng-zhe Zhao Hong-Mei Qiu Ze-Ya zhu Yun-Li Xu zhu-Hong Liu Li-Qing Pan Department of Applied Physics University of Science and Technology BeijingBeijing100083China College of Science China Three Gorges UniversityYichang443002China

The crystal structure,phase transition,metamagnetic behavior and magnetic entropy change(ΔS_(M))of the Mn_(49-x)Cu_(x)Ni_(41)Sn_(10)(x=0-2)alloys were systematically *** results of experiment about crystal structure confirm that Mr_(49-x)Cu_(x)Ni_(41)Sn_(10)alloys have a highly ordered cubic L2_(1)Heusler *** Cu element improving,all samples have a martensitic transformation and inverse martensitic transformation by analyzing the result of magnetic *** saturation magnetization of samples decreases gradually,the martensitic transformation temperature(T_(M))of as-annealed samples increases to a high-temperature area,and the Curie temperature(T_(C))of samples moves to a low-temperature area with the content of Cu element increasing from x=0 to x=*** positive values of magnetic entropy change(ΔS_(M))of all alloys were investigated near the martensitic *** the applied magnetic field is 3 T,a worthwhile value ofΔS_(M)can reach up to 32.0 J·kg^(-1)·K^(-1)in Mn_(47)Cu_(2)Ni_(41)Sn_(10)alloy.

关键词： Heusler alloys Arc melting X-ray diffraction Magnetic properties

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Cretaceous basin evolution in northeast Asia:tectonic responses to the paleo-Pacific plate subduction

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National Science Review 2022年第1期9卷 144-161页

作者： Qing-Ren Meng Zhong-He Zhou ri-Xiang zhu Yi-Gang Xu zheng-Tang Guo State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Innovation Academy for Earth Science Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Key Laboratory of Cenozoic Geology and Environment Chinese Academy of Sciences

Cretaceous rift basin evolution was an important part of the tectonic history of northeast Asia in the late *** types of rift basins are identified—active,passive and wide rift basins—and they developed in different *** rift basins in the eastern North China craton are thought to be the consequence of crustal stretching and passive asthenospheric *** rift basins in the eastern Central Asian orogen are assumed to originate from gravitational collapse of the thickened and heated orogenic *** rift basins in the northern North China craton are attributed to uprising of asthenospheric materials along a lithospheric-scale tear *** tearing of the sub ducting paleo-Pacific plate is postulated and well explains the spatial distribution of different types of rift basins and the eastward shifting of magmatism in the northern North China *** Late Cretaceous witnessed a period of mild deformation and weak magmatism,which was possibly due to kinematic variation of the paleo-Pacific plate.

关键词： NE Asia Cretaceous rift basin volcanism paleo-Pacific plate

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A Novel Method for Achieving Gradient Microstructure in a Cu-Al Alloy:Surface Spinning Strengthening (3S)

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Acta Metallurgica Sinica(English Letters) 2017年第3期30卷 212-217页

作者： Chuan-Xi Ren QiangWang zhen-Jun Zhang Yan-Kun zhu zhe-Feng Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China

A new designed surface strengthening method, surface spinning strengthening （3S）, was applied to achieve gradient microstructure in the surface layer of a Cu-11 at.%A1 alloy. According to the level of grain refinement, the gradient microstructure can be divided into four zones, including nanoscale grain zone, ultra-fine grain zone, fine grain zone and coarse grain zone from the surface to the matrix. Meanwhile, a plenty of grain boundaries and twin boundaries were introduced to inhibit the dislocation motion in the surface layer during the plastic deformation process. Consequently, the hardened layer with a microhardness gradient and high residual compressive stress was produced on the samples, and the yield strength of the Cu-11 at.%A1 alloy was effectively improved after 3S processing due to the strengthening effect caused by the gradient microstructurc.

关键词： Cu-AI alloy Surface spinning strengthening (3S) Strength Microhardness Gradientmicrostructure

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Panorama completion for street views

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Computational Visual Media 2015年第1期1卷 49-57页

作者： zhe zhu Ralph R.Martin Shi-Min Hu TNLIST Department of Computer Science and Technology Tsinghua University School of Computer Science & Informatics Cardiff University

This paper considers panorama images used for street views. Their viewing angle of 360° causes pixels at the top and bottom to appear stretched and warped. Although current image completion algorithms work well, they cannot be directly used in the presence of such distortions found in panoramas of street views. We thus propose a novel approach to complete such 360° panoramas using optimizationbased projection to deal with distortions. Experimental results show that our approach is efficient and provides an improvement over standard image completion algorithms.

关键词： image completion panorama street views structure-rectifying warp

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