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A novel active-passive protection strategy endows carbonyl iron with excellent intelligent anti-corrosion and microwave absorption dual functional characteristics

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Nano Research 2025年第1期18卷 487-500页

作者： Wei Tian Quanyuan feng Linbo Zhang Yinfan Liu Xian Jian Longjiang Deng Institute of Microelectronics School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 611756China National Engineering Researching Centre of Electromagnetic Radiation Control Materials Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of EducationState Key Laboratory of Electronic Thin Films and Integrated DevicesSchool of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China The Yangtze Delta Region Institute(huzhou)&School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaHuzhou 313001China

Carbonyl iron absorbers(CI)face significant challenges in practical applications,such as corrosion,interface bonding failure,detachment,and high maintenance ***,we have developed intelligent self-healing technology based on proactive/passive mechanisms via in situ synthesis of self-healing factors(polydopamine/benzotriazole(PDA/BTA))and physical barrier layers(SiO_(2)/1,1,1,3,3,3-hexamethyl disilazane,SiO_(2)/hMDS)to enhance corrosion resistance,while also being compatible with efficient microwave absorption *** unique multiscale structure gives full play to the utilization of the roles of each functional layer,including the intelligent self-healing features of PDA/BTA,physical shielding and spatial confinement characteristics of SiO_(2)/hMDS,and magnetic-dielectric synergistic mechanism resulted from the good impedance matching characteristics,the conduction loss,the interfacial polarization loss and natural *** asfabricated composites achieved an exceptional minimum reflection loss value of-55.4 dB at 10.7 Ghz and the effective absorption band of 7.6 ***,it still exhibits obvious self-healing and corrosion resistance characteristics after 360 h corrosion treatment,ascribed to the self-healing mechanism of PDA/BTA and the blocking intervention effect of SiO_(2)/*** work is considered to pave the way for the synthesis of high-performance magnetic absorbers,especially in enhancing their intelligent self-healing ability in corrosive environments.

关键词： microwave absorption intelligent self-healing technology carbonyl iron multiscale structure magneticdielectric synergistic mechanism

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Static and Dynamic Properties of Soil Food Web Structure in a Greenhouse Environment

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Pedosphere 2014年第2期24卷 258-270页

作者： ChEN Yun-feng CAO Zhi-Ping L.POPESCU B.h.KIEPPER Institute of Plant Protection and Soil Fertilizer Hubei Academy of Agricultural Sciences College of Resources and Environmental Science China Agricultural University Department of Biological and Agricultural Engineering University of Georgia

Soil food web structure is fundamental to ecosystem process and function; most studies on soil food web structure have focused on agro-ecosystems under different management practices and natural terrestrial ecosystems,but seldom on greenhouses. This study explored the static and temporal variability of soil food structure in two greenhouses of Shandong Province,North China over a two-year period. The static properties were measured directly by surveying functional group composition and a series of parameters portraying the species properties,link properties,chain properties and omnivory properties of the web,as well as indirectly through calculation of nematode indices,enrichment index(EI),structure index(SI),and channel index(CI). The dynamic variability of greenhouse soil food structure was described by the dynamics of functional groups,Bray-Curtis(BC) similarity and cluster analysis. The results showed that the greenhouse soil food web contained 14 functional groups,with microbes having the highest mean biomass,followed by protozoa. Of the three functional groups of protozoa,flagellates were the dominant group on most sampling dates,amoebae only became the dominant group during the summer,while ciliates were the least prevalent group. All nematodes were assigned into one of the four functional groups,bacterivorous,fungivorous,herbivorous and omnivorous,and the fungivorous nematodes had the lowest mean biomass. Mites were assigned into three functional groups and the omnivorous noncryptostigmatic mites were the dominant group. All the functional groups showed significant seasonal changes. The soil food web connectance was 0.15,the maximum food chain length was 5,and the average food chain length was 3.6. The profiles of the EI and SI showed that the food web was resourcedepleted with minimal structure. The results of CI indicated that the bacterial decomposition pathway was the dominant pathway in the food web of the greenhouse soils studied and the results of BC

关键词： Bray-Curtis similarity functional group mites nematodes protozoa

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Nitrogen Cycling and Losses Under Rice-Wheat Rotations with Coated Urea and Urea in the Taihu Lake Region

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Pedosphere 2007年第1期17卷 62-69页

作者： WANG Xiao-Zhi ZhU Jian-Guo GAO Ren h. YASUKAZU feng Ke State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） Environment Science and Engineering College Yangzhou University Yangzhou 225009 （China） Fujian Normal University Fuzhou 350007 （China） Japan International Research Center for Agricultural Sciences 1-2 Ohwashi Tsukuba Ibaraki 305-8686 （Japan）

A lysimeter experiment with undisturbed soil profiles was carried out to study nitrogen cycling and losses in a paddy soll with applications of coated urea and urea under a rice-wheat rotation system in the Taihu Lake region from 2001 to 2003. Treatments for rice and wheat included urea at conventional, 300 （rice） and 250 （wheat） kg N ha^-1, and reduced levels, 150 （rice） and 125 （wheat） kg N ha^-1, coated urea at two levels, 100 （rice） and 75 （wheat） kg N ha^-1, and 150 （rice） and 125 （wheat） kg N ha^-1, and a control with no nitrogen arranged in a completely randomized design. The results under two rice-wheat rotations showed that N losses through both Nh3 volatilization and runoff in the coated urea treatments were much lower than those in the urea treatments. In the urea treatments N runoff losses were significantly （P 〈 0.001） positively correlated （r = 0.851） with applied N. N concentration in surface water increased rapidly to maximum two days after urea application and then decreased quickly. however, if there was no heavy rain within five days of fertilizer application, the likelihood of N loss by runoff was not high. As the treatments showed little difference in N loss via percolation, nitrate N in the groundwater of the paddy fields was not directly related to N leaching. The total yield of the two rice-wheat rotations in the treatment of coated urea at 50% conventional level was higher than that in the treatment of urea at the conventional level. Thus, coated urea was more favorable to rice production and environmental protection than urea.

关键词： ammonia volatilization coated urea N cycling percolation runoff

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Advances in Effects of Sound Waves on Plants

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Journal of Integrative Agriculture 2014年第2期13卷 335-348页

作者： Reda h E hassanien hOU Tian-zhen LI Yu-feng LI Bao-ming College of Water Resources and Civil Engineering China Agricultural University Agricultural Engineering Department Faculty of AgricultureCairo University Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture

Sound waves technology has been applied to different plants. It has been found that sound waves were at different frequencies, sound pressure levels （SPLs）, exposure periods, and distances from the source of sound influence plant growth. Experiments have been conducted in the open field and under greenhouse growing conditions with different levels of audible sound frequencies and sound pressure levels. Sound waves at 1 khz and 100 dB for 1 h within a distance of 0.20 m could significantly promote the division and cell wall fluidity of callus cells and also significantly enhance the activity of protective enzymes and endogenous hormones. Sound waves stimulation could increase the plant plasma-membrane IT-ATPase activity, the contents of soluble sugar, soluble protein, and amylase activity of callus. Moreover, sound waves could increase the content of RNA and the level of transcription. Stress-induced genes could switch on under sound stimulation. Sound waves at 0.1-1 khz and SPL of （70＋5） dB for 3 h from plant acoustic frequency technology （PAFT） generator within a distance ranged from 30 to 60 m every other day significantly increased the yield of sweet pepper, cucumber and tomato by 30.05, 37.1 and 13.2%, respectively. Furthermore, the yield of lettuce, spinach, cotton, rice, and wheat were increased by 19.6, 22.7, 11.4, 5.7, and 17.0%, respectively. Sound waves may also strengthen plant immune systems. It has been proved that spider mite, aphids, gray mold, late blight and virus disease of tomatoes in the greenhouses decreased by 6.0, 8.0, 9.0, 11.0, and 8.0%, respectively, and the sheath blight office was reduced by 50%. This paper provides an overview of literature for the effects of sound waves on various growth parameters of plant at different growth stages.

关键词： acoustic technology sound waves plants growth

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Re-visit N／Z Ratio of Free Nucleons from Collisions of Neutron-Rich Nuclei as a Probe of EoS of Asymmetric Nuclear Matter

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Communications in Theoretical Physics 2004年第3期41卷 435-440页

作者： LIQing-feng LIZhu-Xia ZhAOEn-Guang h.Stoecker InstituteofTheoreticalPhysics theChineseAcademyofSciencesP.O.Box2735Beijing100080China ChinaInstituteofAtomicEnergy P.O.Box275（18）Beijing102413ChinaCenterofTheoreticalNuclearPhysicsNationalLaboratoryofLanzhouHeavyIonAcceleratorLanzhou730000China InsitutfürTheoretischePhysik UniversitaetFrankfurtFrankfurt60054Germany

The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a function of their momentum is studied by means of isospin-dependent Quantum Molecular Dynamics. We find that this ratio is not only sensitive to the form of the density dependence of the symmetry potential energy but also its strength determined by the symmetry energy coefficient. The uncertainties about the symmetry energy coefficient influence the accuracy of probing the density dependence of the symmetry energy by means of the N/Z ratio of free nucleons of neutron-rich nuclei.

关键词： symmetry potential heavy ion collisions neutron and proton chemical potential

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EFFECTS OF GAS FLOW RATE ON CLARK-TYPE OXYGEN GAS SENSOR

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Chinese Chemical Letters 1995年第6期6卷 505-508页

作者： Liu, SJ Shen, hX Qiu, Yh Wang, h feng, JX Nankai Univ Dept Chem Tianjin 300071 Peoples R China Nankai Univ Dept Environm Sci Tianjin 300071 Peoples R China

The flow rate sensitivity of membrane-covered oxygen gas sensor has been tested experimentally. the oxygen sensor,gas flowmeter,and air pump are arranged in six types of connective modes, the flow sensitivity of oxygen sensor is notably different. Preliminary results on the positional flow rate sensitivity of oxygen gas sensor are reported.

关键词： GAS EFFECTS OF GAS FLOW RATE ON CLARK-TYPE OXYGEN GAS SENSOR

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Formation mechanism of a rainfall triggered complex landslide in southwest China

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Journal of Mountain Science 2020年第5期17卷 1128-1142页

作者： hUANG Qiu-xiang XU Xiang-tao P.h.S.W.KULATILAKE LIN feng State Key Lab of Geohazard Preventionand Environment Protection(SKLGP) Chengdu University of Technology(CDUT)Chengdu 610059China Rock Mass Modeling and Computational Rock Mechanics Laboratories University of ArizonaTucsonAZ 85721USA School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

This case study is about a landslide that occurred after 4 days of heavy rainfall,in the morning of June 29,2012,in Cengong County,Guizhou Province of China,geographical coordinated 108°20′-109°03′E,27°09′-27°32′N,with an estimated volume of 3.3×106 *** fully investigate the landslide process and formation mechanism,detailed geotechnical and geophysical investigations were performed including borehole drilling,sampling,and laboratory tests coupled with monitoring of ***,a combined seepage-slope stability modeling was performed to study the behavior of the *** the heavy rainfall event,the sliding process started in this *** landslide development can be divided into different *** man-made fill area,spatially distributed in the south side of the landslide area with low elevations,slid first along the interface between the slope debris and the strongly weathered bedrock roughly in the EW ***,due to severe lateral shear disturbance,the slope in the main sliding zone slid next towards the SW direction,along the sliding surface developed within the strongly weathered calcareous shale formation located at a depth of 25-35 *** means it was a rainfall triggered deep-seated ***,retrogressive failure of a number of upstream blocks occurred,which moved in more than one *** initial failure of the man-made fill area was the‘engine’of the whole instability *** artificial material with low permeability,piled up in the accumulation area of surface and sub-surface and destroyed the drainage capacity of the *** numerical modeling results agreed with the analysis results obtained from the laboratory and field investigations.A conceptual model is given to illustrate the formation mechanism and development process of the landslide.

关键词： Complex landslide Man-made fill Shale formation Lateral shear failure Conceptual model

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Interfacial microstructure and mechanical properties of diffusion-bonded joints of titanium TC4 (Ti-6Al-4V) and Kovar (Fe-29Ni-17Co) alloys

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Journal of Iron and Steel Research International 2017年第10期24卷 1023-1031页

作者： Ting-feng Song Xiao-song Jiang Zhen-yi Shao De-feng Mo De-gui Zhu Min-hao Zhu Christina h.Young Zhi-ping Luo School of Materials Science and Engineering Southwest Jiaotong University Department of Material Engineering Chengdu Technological University Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical PhysicsChinese Academy of Sciences Department of Chemistry and Physics Fayetteville State University

Diffusion bonding is a near net shape forming process that can join dissimilar materials through atomic diffusion under a high pressure at a high *** alloy TC4（Ti-6 Al-4 V）and 4 J29 Kovar alloy（Fe-29 Ni-17 Co）were diffusely bonded by a vacuum hot-press sintering process in the temperature range of 700-850°C and bonding time of 120 min,under a pressure of 34.66 *** microstructures and intermetallic compounds of the diffusion-bonded joints were characterized by optical microscopy,scanning electron microscopy,X-ray diffraction（XRD）and energy dispersive spectroscopy（EDS）.The elemental diffusion across the interface was revealed by electron probe *** properties of joints were investigated by micro Vickers hardness and tensile *** of EDS and XRD indicated that（Fe,Co,Ni）-Ti,TiNi,Ti_2Ni,TiNi_2,Fe_2 Ti,Ti_（17） Mn_3 and Al_6 Ti_（19） were formed at the *** the bonding temperature was raised from 700 to 850°C,the voids of interface were reduced and intermetallic layers were *** tensile strength of joints at 53.5 MPa was recorded by the sintering process at 850°C for 120 *** surface of the joint indicated brittle nature,and failure took place through interface of intermetallic *** on the mechanical properties and microstructure of the diffusion-bonded joints,diffusion mechanisms between Ti-6 Al-4 Vtitanium and Fe-29 Ni-17 Co Kovar alloys were analyzed in terms of elemental diffusion,nucleation and growth of grains,plastic deformation and formation of intermetallic compounds near the interface.

关键词： Titanium alloy Kovar alloy Diffusion-bonded joint Microstructure Mechanical property

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Effect of vacuum degree and aeration rate on sludge dewatering behavior with the aeration-vacuum method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第9期11卷 638-655页

作者： Yu-feng GAO Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing 210098 China Geotechnical Research Institute Hohai University Nanjing 210098 China The Science and Technology Division Hohai University Nanjing 210098 China

Due to large-scale dredging operations, a large amount of sludge is inevitably produced. Large areas of land are occupied when the dredged sludge is discarded in the disposal site as waste material. The sludge dewatering with aeration-vacuum (SDAV) method is suit for treating the sludge with high water content and high clay content in the disposal site. The water in the sludge can be discharged out. The volume of the sludge can be reduced quickly, and the recycling of the land can be accelerated by this method. Most importantly, this technique is an efficient way to deal with clogging problems when pumping water from high water content, high clay content dredged sludge. Vacuum degree range tests, the aeration rate range tests, and the influencing factors of sludge dewatering behavior tests were conducted with a self-developed SDAV model test device. Sludge samples were taken from the South-to-North Water Diversion East Line Project in huai’an White-horse Lake disposal site, Jiangsu Province, China. The optimal range of vacuum degree and aeration rate were obtained through the test results, and the mechanisms for how the two factors work and how they affect the sludge dewatering behavior were analyzed. The suitable vacuum degree range in SDAV is below 50 kPa, and the suitable aeration rate is about 1.0 m3/h. The low-vacuum degree contributes to reduce the ad-sorption effect of micro-channels on soil particles in filter material and to maintain the arch structures. Aeration has the effects of expansion, disturbance, changing Reynolds number, and dynamic sieve separating. The pump quantity of water per meter of filter tube (m) has different change rules as the vacuum degree changes under different aeration rates. The reason is that the formed arch structures’ conformation and permeability differ greatly under different combined-conditions of vacuum degree and aeration rate. The optimal combined-condition for dewatering the sludge is 35 kPa with 1.0 m3/h.

关键词： high water content dredged sludge Sludge dewatering with aeration-vacuum (SDAV) Vacuum degree Aeration rate Arch structures

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Evidence of advancing spring xylem phenology in Chinese forests under global warming

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Science China Earth Sciences 2023年第10期66卷 2187-2199页

作者： huihong XUE feng ShI Fabio GENNARETTI Yongshuo h.FU Bin hE Xiuchen WU Zhengtang GUO Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China CAS Center for Excellence in Life and Paleoenvironment Beijing100044China Institut de Recherche sur les Forêts Groupe de Recherche enÉcologie de la MRC-AbitibiUniversitédu Québec en Abitibi-TémiscamingueAmosJ9T 2L8Canada College of Water Sciences Beijing Normal UniversityBeijing100875China Faculty of Geographical Science Beijing Normal UniversityBeijing100875China

Phenological responses of vegetation to the ongoing warming trend impact current and future primary ***,few studies focus on wood phenology because its observed data are much scarcer,which hinders the estimation and prediction of forest carbon budgets over large ***,we use a physiological process-based tree-ring growth model(Vaganov-Shashkin model)to investigate the spatial and temporal variations of spring xylem phenology(start of the growing season of xylem,SOS_(x))in tree-ring sites of China during 1962-2016 *** model is calibrated on measured tree-ring width chronologies(70 tree-ring chronologies)and successfully validated with field observations of *** found that spring xylem phenology significantly advances during 1962-2016 CE period under global warming,with the rate of advance quickly increasing after the 1990s to an average of 0.25 days per *** preseason daily mean temperature is the main climatic driver for spring xylem phenology as indicated by its significant correlations with SOS_(x)at most sites(71%).Warmer preseason allows heat requirements for tree growth to be reached more quickly,with increase of 1℃in temperature of preseason anticipates SOS_(x)by 6 to 7 days,which will benefit the radial growth of trees in the relatively cold-humid *** addition,the significant positive correlation between the simulated spring xylem phenology and remote sensing derived phenology highlights the primary and secondary growth may be governed by the same variable(temperature)and change in the same direction with global *** study provides the long-term perspective on the spring xylem phenology variations covering most of China.

关键词： Tree-ring Xylem Phenology Vaganov-Shashkin model China

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