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AN ANALYSIS ON THE STRUCTURE TYPES AND BENEFITS OFSLOPELAND AGROFORESTRY SYSTEMS-Taking the Three Gorge Reservoir Area As An Example
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作者 Shen Yuancun Leng Shuying Zhang Yongtao(Institute of Geography, CAS, Beijing 100101 People’s Republic of China) 《Journal of Geographical Sciences》 SCIE CSCD 1995年第4期42-51,共10页
The modem term 'agroforestry system' is derived from agricultural practices. It is an organic combination of agriculture and forestry, ecology and economy, product variation and scientific management. On the b... The modem term 'agroforestry system' is derived from agricultural practices. It is an organic combination of agriculture and forestry, ecology and economy, product variation and scientific management. On the basis of analyzing the types and structure of agroforestry system in the Three Gorges Reservoir area,the paper poins out that agroforestry system can be divided into diffend structutal levds. Taking some typical cases as examples, it compares the benefits of four kinds of structures. The result illustrates that the hedge row agroforestry system on slopeland is an effective way to realize coordinate development of ecology and economy. 展开更多
关键词 The Three Gorge reservoir area Yangtze River slopeland agroforesstry system structure type
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Automatic identifcation of building structure types using unmanned aerial vehicle oblique images and deep learning considering facade prior knowledge
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作者 Leilei Zhang Guoxin Wang Weijian Sun 《International Journal of Digital Earth》 SCIE EI 2023年第1期3348-3367,共20页
Building structural type information is the foundation for seismic risk assessment and management since it reflects the behavior of buildings under seismic load.However,in earthquake-prone regions,most of this informa... Building structural type information is the foundation for seismic risk assessment and management since it reflects the behavior of buildings under seismic load.However,in earthquake-prone regions,most of this information is out-of-date or nonexistent.This paper proposes a deep learning-based method for automatically identifying building structural types from unmanned aerial vehicle(UAV)oblique images.The method consists of four steps:(1)collect facades of buildings with different structural types by web crawler technology as a sample set;(2)construct a convolutional neural network with a facade prior knowledge attention branch and train the model using the sample set;(3)extract building facades from UAV oblique images based on the georeferencing results of feature points as the test set;(4)identify building structural types by inputting the test set into the trained model.Three cases have been selected to verify the feasibility and applicability of the method.The average recall rate of 85%and the average F1 score of 83%have been achieved in areas with regular building distribution.This method integrates multidisciplinary knowledge to provide a solution for rapid collection of building vulnerability information,and expands the role of oblique photography data in urban management and disaster prevention planning. 展开更多
关键词 Oblique photography deep learning building structural types UAV attention branch
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Synthesis and structures of cdq‑topological quaternary and(4,4,8)‑c topological quinary Zn‑MOFs with both oxalic acid and triazole ligands
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作者 LIANG Jing WANG Qian BAI Junfeng 《无机化学学报》 SCIE CAS CSCD 北大核心 2024年第11期2186-2192,共7页
Different solvothermal reactions of ZnC2O_(4)with oxalic acid(H_(2)ox)and 1,2,4-triazole(Htrz)successfully gave a new quaternary(NJTU-Bai83,NJTU-Bai=Nanjing Tech University Bai's group)and a new quinary(NJTU-Bai84... Different solvothermal reactions of ZnC2O_(4)with oxalic acid(H_(2)ox)and 1,2,4-triazole(Htrz)successfully gave a new quaternary(NJTU-Bai83,NJTU-Bai=Nanjing Tech University Bai's group)and a new quinary(NJTU-Bai84)anionic metal-organic frameworks(MOFs),where NJTU-Bai83=(Me_(2)NH_(2))2[Zn_(3)(trz)_(2)(ox)_(3)]·2H_(2)O and NJTU-Bai84=(Me_(2)NH_(2))[Zn_(3)(trz)_(3)(ox)_(2)]·H_(2)O,respectively.With the[Zn_(2)(ox)4(trz)_(2)]secondary building unit(SBU)in NJTU-Bai83 replaced by the[Zn_(3)(ox)_(2)(trz)_(6)]and planar[Zn(ox)_(2)(trz)_(2)]ones in NJTU-Bai84,2D supramolecular building layers(SBLs)are changed from the A-layer and B-layer to another A-layer,while pillars are transformed from the tetrahedral[Zn(ox)_(2)(trz)_(2)]SBU to the irregular tetrahedral[Zn(ox)_(2)(trz)_(2)]and planar[Zn(ox)_(2)(trz)_(2)]SBUs.Thus,cdq-topological quaternary NJTU-Bai83 is tuned to(4,4,8)-c new topological quinary NJTU-Bai84.Two MOFs were well characterized by powder X-ray diffraction,thermogravimetric analysis,elemental analysis,etc.CCDC:2351819,NJTU-Bai83;2351820,NJTU-Bai84. 展开更多
关键词 controlled synthesis multivariant metal-organic frameworks pillar-layer typed structures
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New cadmium and rare earth metal tungstates with the scheelite type structure 被引量:1
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作者 E.Tomaszewicz S.M.Kaczmarek H.Fuks 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第4期569-573,共5页
New cadmium and rare earth metal tungstates with the formula Cd0.25RE0.50 0.25WO4 (RE=Nd, Sin, Eu, Gd, D-statistical distrib- uted vacancies in cation sublattice) were synthesized by the solid-state reaction between... New cadmium and rare earth metal tungstates with the formula Cd0.25RE0.50 0.25WO4 (RE=Nd, Sin, Eu, Gd, D-statistical distrib- uted vacancies in cation sublattice) were synthesized by the solid-state reaction between CdWO4 and corresponding RE2W209. The obtained phases crystallize in the scheelite type structure. The Cd0.25RE0.5 0.25WO4 compounds were characterized by X-ray diffractometer (XRD), (DTA-TG), infrared (IR) and EPR methods. 展开更多
关键词 rare earth metal tungstates scheelite type structure XRD DTA-TG EPR
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Synthesis and Electronic Structure of A2B Type Halogen Atoms Substituted H3-Triarylcorroles 被引量:1
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作者 李敏智 朱卫华 +3 位作者 MACK John MKHIZE Scebi NYOKONG Tebello 梁旭 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2017年第3期367-380,共14页
Seven electron-deficient A_2 B type H_3-triarylcorroles have been synthesized and characterized. The solvent dependence of the electronic absorption and magnetic circular dichroism(MCD) spectra and a series of TD-DF... Seven electron-deficient A_2 B type H_3-triarylcorroles have been synthesized and characterized. The solvent dependence of the electronic absorption and magnetic circular dichroism(MCD) spectra and a series of TD-DFT calculations have been used to analyze trends in the electronic structures. Significant differences are observed in the optical spectra when solvents of differing polarity are used,which can be assigned to the effect of NH-tautomerism. 展开更多
关键词 A_2B type corrole solvatochromism electronic structure spectroscopy TD-DFT
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Structures and Spectroscopy Properties of One Novel Keggin Type Polyoxomolybdate Compound
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作者 GUO Bing-cui ZHOU Meng-xi +4 位作者 HUANG Mei-qing LIN Hui-yun SHI Lin HUANG Meng-meng CHEN Yi-ping 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2016年第S1期208-209,共2页
In this paper,One novel Keggin type polyoxomolybdate compounds have been hydrothermal synthesized:{[(CH3)2NH2]4(SiMo12O40)}[(CH3)2NH]·(DMF)0.5(1).The compound 1have been characterized by infrared spectrum,and the... In this paper,One novel Keggin type polyoxomolybdate compounds have been hydrothermal synthesized:{[(CH3)2NH2]4(SiMo12O40)}[(CH3)2NH]·(DMF)0.5(1).The compound 1have been characterized by infrared spectrum,and the two-dimensional infrared correlation spectroscopy. 展开更多
关键词 POLYOXOMOLYBDATE Keggin type structure 2DIR COS
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Synthesis and Characterization of Charge-transfer Complexes of Aminoethylphosphono-and Dimethylaminoethylphosphono-heteropolytungstic Acids of Keggin Type Structure
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作者 XiangKaiFU YunGONG 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第5期509-512,共4页
Two charge-transfer complexes of 2a and 2b of Keggin type were synthesized and characterized by elemental analysis, IR spectra, UV spectra, XRD, TG-DSC; and were compared with Hquin-PW12. The primary structure of the... Two charge-transfer complexes of 2a and 2b of Keggin type were synthesized and characterized by elemental analysis, IR spectra, UV spectra, XRD, TG-DSC; and were compared with Hquin-PW12. The primary structure of the heteropolyanions had not been changed after the formation of the charge transfer complexes. 展开更多
关键词 Aminoethylphosphonic acid dimethylaminoethylphosphonic acid organo-phospho-noheteropolytungstic acid charge transfer complex Keggin type structure.
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A NEW TYPE OF CHAIN COMPOUND,STRUCTURE OF TA_4(TE_2)_4TE_4I
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作者 Shui Quan DENG Hong Hui ZHUANG Ding Ming WU Jin Ling BUANG Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences and State Key Laboratory of Structure Chemistry,Fuzhou,Fujian 350002 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第3期273-274,共2页
Ta_4(Te_2)_4Te_4I,Mr=2381.90,Monoclinic,C2/c,a=21.987(2),b=6.153(2),c= 19.936(3),β=122.42(14),V=2276.7 ~3,z=4,Dm=6.8(5)g/cm^3,Dc=6.95g/cm^3,λ(Mok)= 0.71073,μ=354.0cm^(-1),F(000)=3876,T=296(1)k,R=5.3%,Rw=6.8%,for 11... Ta_4(Te_2)_4Te_4I,Mr=2381.90,Monoclinic,C2/c,a=21.987(2),b=6.153(2),c= 19.936(3),β=122.42(14),V=2276.7 ~3,z=4,Dm=6.8(5)g/cm^3,Dc=6.95g/cm^3,λ(Mok)= 0.71073,μ=354.0cm^(-1),F(000)=3876,T=296(1)k,R=5.3%,Rw=6.8%,for 1118 unique observed reflections(1>3σ(Ⅰ)).The structure is composed of [Ta_4(Te_2)_4Te_4I]_∞~ chains,which are formed by the four-nuclear butterfly cluster units "Ta_4(Te_2)_4Te_4" with the Ⅰ atoms as the bridging atoms between different cluster units. 展开更多
关键词 TA TE A NEW type OF CHAIN COMPOUND structure OF TA4 TE2
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Band Structure and Optical Gain of InGaAs/GaAsBi Type-Ⅱ Quantum Wells Modeled by the k·p Model
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作者 Chang Wang Wenwu Pan +1 位作者 Konstantin Kolokolov Shumin Wang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第5期133-136,共4页
Optical gains of type-Ⅱ In Ga As/Ga As Bi quantum wells(QWs) with W, N, and M shapes are analyzed theoretically for near-infrared laser applications. The bandgap and wave functions are calculated using the self-con... Optical gains of type-Ⅱ In Ga As/Ga As Bi quantum wells(QWs) with W, N, and M shapes are analyzed theoretically for near-infrared laser applications. The bandgap and wave functions are calculated using the self-consistent k·p Hamiltonian, taking into account valence band mixing and the strain effect. Our calculations show that the M-shaped type-Ⅱ QWs are a promising structure for making 1.3 um lasers at room temperature because they can easily be used to obtain 1.3 um for photoluminescence with a proper thickness and have large wave-function overlap for high optical gain. 展开更多
关键词 As BI In Ga Band structure and Optical Gain of InGaAs/GaAsBi type Quantum Wells Modeled by the k p Model
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A Study of Plume Rise from Multi-tube Chimney and Types of Chimney Structure
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作者 Liu Yongjiu Northwest Electric Power Design Institute 《Electricity》 1996年第3期18-22,共5页
This paper tries to determine the economical type of reinforced concrete chimney structure based on the same effective height of chimney. The simulated experiments of wind tunnel are performed for the study, which com... This paper tries to determine the economical type of reinforced concrete chimney structure based on the same effective height of chimney. The simulated experiments of wind tunnel are performed for the study, which compare multi-tube chimney with single tube chimney based on the same buoyancy flux of plume. According to the comparison among the experiment results and the previous study of plume rise, the paper defines some final plume rise models. Finally, the paper gives the cost-benefit analysis after making cost estimation for different types of chimney structure and recommends the economical and reasonable type of chimney structure in light of the same environmental benefits. 展开更多
关键词 A Study of Plume Rise from Multi-tube Chimney and types of Chimney structure THAN
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Rock physical characteristics of deep dolomite under complex geological conditions:A case study of 4th Member of Sinian Dengying Formation in the Sichuan Basin,China
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作者 Chuang Li Shu-Xin Pan +4 位作者 Hong-Bin Wang Ji-Xin Deng Jian-Guo Zhao Zhi Li Yu Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2024年第4期2370-2382,共13页
The deep-ultra deep carbonate reservoir in China,commonly subjected to modification of multi-stage diagenesis,has extremely high heterogeneity.Conventional rock physics analysis cannot accurately identify the elastic ... The deep-ultra deep carbonate reservoir in China,commonly subjected to modification of multi-stage diagenesis,has extremely high heterogeneity.Conventional rock physics analysis cannot accurately identify the elastic responses of reservoir.Here,the rock physics properties of the dolomite from the 4th Member of the Sinian Dengying Formation are experimentally measured,and the change law of rock physics characteristics is investigated within the framework of the diagenetic processes by the analysis of the elastic and petrologic characteristics,pore structure,and sedimentary environments.The results show that the differentiated diagenesis results in different pore structure characteristics and microtexture characteristics of the rock.The microbial dolomite of the algal mound-grain beach facies is subjected to the contemporaneous microbial dolomitization and seepage-reflux dolomitization,penecontemporaneous selective dissolution,burial dolomitization,and hydrothermal dolomitization.The resultant crystalline dolomite is found with one main type of the dolomite crystal contact boundaries,and the dissolution pore is extensive development.The siliceous,muddy,and limy dolomite of the interbeach sea environment mainly experiences the weak capillary concentration dolomitization,intensive mechanical compaction-induced densification,and burial dolomitization.Such crystalline dolomite is observed with four types of contact boundaries,namely the dolomite contact,clay contact,quartz contact,and calcite contact boundaries,and porosity mostly attributed to residual primary inter-granular or crystalline pores.The samples with the same crystal boundary condition have consistent correlations between the compressional-and shear-wave velocities,and between the compressional-wave velocity and the velocity ratio.Additionally,the variation of the acoustic velocity with effective pressure and the intensity of pore-scale fluid-related dispersion are controlled by the differentiation of pore structure types of the samples.The varied effects of soft pores like micro-cracks on the compressional-and shearwave velocity causes considerable changes in the relationships between the compressional-and shearwave velocities,compressional-wave velocity and velocity ratio,and porosity and acoustic velocity.This research is an attempt to demonstrate a novel method for investigating the rock physics variation of rock during the geological process,and the obtained findings can provide the rock physics basis for seismic prediction of the characteristics of deep carbonate reservoirs. 展开更多
关键词 Deep-ultra deep carbonate reservoirs Rock physics properties DOLOMITE Seismic elastic properties MICRO-CRACK Pore structure types
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Static Induction Devices with Planar Type Buried Gate 被引量:1
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作者 王永顺 李思渊 胡冬青 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2004年第2期126-132,共7页
Based on the surface-gate and buried-gate structures,a novel buried-gate structure called the planar type buried-gate (PTBG) structure for static induction devices (SIDs) is proposed.An approach to realize a buried-ga... Based on the surface-gate and buried-gate structures,a novel buried-gate structure called the planar type buried-gate (PTBG) structure for static induction devices (SIDs) is proposed.An approach to realize a buried-gate type static induction transistor by conventional planar process technology is presented.Using this structure,it is successfully avoided the second epitaxy with a high degree of difficulty and the complicated mesa process in conventional buried gate.The experimental results demonstrate that this structure is desirable for application in power SIDs.Its advantages are high breakdown voltage and blocking gain. 展开更多
关键词 static induction device planar type buried gate structure blocking voltage limiting field ring
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Basic Types and Structural Characteristics of Uplifts:An Overview of Sedimentary Basins in China 被引量:20
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作者 HE Dengfa LI Desheng +1 位作者 WU Xiaozhi WEN Zhu 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2009年第2期321-346,共26页
The uplift is a positive structural unit of the crust. It is an important window for continental dynamics owing to its abundant structural phenomena, such as fault, fold, unconformity and denudation of strata. Meanwhi... The uplift is a positive structural unit of the crust. It is an important window for continental dynamics owing to its abundant structural phenomena, such as fault, fold, unconformity and denudation of strata. Meanwhile, it is the very place to store important minerals like oil, natural gas, coal and uranium. Giant and large-scale oil and gas fields in China, such as the Daqing Oilfield, Lunnan-Tahe Oilfield, Penglai 19-3 Oilfield, Puguang Gas Field and Jingbian Gas Field, are developed mainly on uplifts. Therefore, it is the main target both for oil and gas exploration and for geological study. The uplift can be either a basement uplift, or one developed only in the sedimentary cover. Extension, compression and wrench or their combined forces may give rise to uplifts. The development process of uplifting, such as formation, development, dwindling and destruction, can be taken as the uplifting cycle. The uplifts on the giant Precambrian cratons are large in scale with less extensive structural deformation. The uplifts on the medium- and small-sized cratons or neo-cratons are formed in various shapes with strong structural deformation and complicated geological structure. Owing to changes in the geodynamic environment, uplift experiences a multi-stage or multi-cycle development process. Its geological structure is characterized in superposition of multi-structural layers. Based on the basement properties, mechanical stratigraphy and development sequence, uplifts can be divided into three basic types-the succession, superposition and destruction ones. The succession type is subdivided into the maintaining type and the lasting type. The superposition type can be subdivided into the composite anticlinal type, the buried-hill draped type, the faulted uplift type and the migration type according to the different scales and superimposed styles of uplifts in different cycles. The destruction type is subdivided into the tilting type and the negative inverted type. The development history of uplifts and their controlling effects on sedimentation and fluids are quite different from one another, although the uplifts with different structural types store important minerals. Uplifts and their slopes are the main areas for oil and gas accumulation. They usually become the composite oil and gas accumulation zones (belts) with multiple productive formations and various types of oil and gas reservoirs. 展开更多
关键词 UPLIFT geological structure structural type continental dynamics oil and gasaccumulation sedimentary basin China
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Study on Structure of Arched Longitudinal Beams of Deep-Water Wharf 被引量:3
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作者 翟秋 鲁子爱 张淑华 《China Ocean Engineering》 SCIE EI 2008年第4期705-711,共7页
High-pile and beam-slab quays have been widely used after several years development. They are mature enough to be one of the most important structural types of wharves in China coastal areas. In order to accommodate l... High-pile and beam-slab quays have been widely used after several years development. They are mature enough to be one of the most important structural types of wharves in China coastal areas. In order to accommodate large tonnage vessels, wharves should be eorrstructed in deep water gradually. However, conventional high-pile and beam-slab structares are hard to meet the requirements of large deep-water wharf. According to arch' s stress characteristics, a new type of wharf with catenary arched longitudinal beams is presented in this paper. The new wharf structure can make full use of arch's overhead crossing and reinforced concrete compression resistance, improve the interval between transverse bents greatly, and decrease underwater construction quantity. Thus, the construction cost cab be reduced. Take the third phase project of the Yangshan Deep-water Port for example, comparative analysis on catenary arched longitudinal beams and conventional longitudinal beams has been made. The result shows that with the same wharf length and width, the same loads and same longitudinal beam moment, catenary arch structure can improve the interval between bents up to 28 m, decrease the nmnber of piles and underwater construction quantity. 展开更多
关键词 WHARF structural type cateriary arch internal force COST
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Structural Types of Sea Embankment and Their Stability Analysis
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作者 Mao, CX Duan, XB Mao, PY 《China Ocean Engineering》 SCIE EI 1998年第3期333-352,共20页
In this paper based on investigation on the structural types of sea embankments in the southeast coastal area of China, as well as the related tidal stages, waves and strength of marine soils, the finite element metho... In this paper based on investigation on the structural types of sea embankments in the southeast coastal area of China, as well as the related tidal stages, waves and strength of marine soils, the finite element method (FEM) calculations for seepage flow stability, including the overall stability against sliding and local stability of sloping surface under the action of tidal stage and waves are carried out. A comparison of the computational results of FEM for single circular slip, composite circular slip and geogrid reinforcement against sliding shows that for calculation of stability against sliding of marine soft soil foundation it is even more reasonable to use the composite circular slip. The stability of sloping type sea embankment against sliding is slightly better than that of the vertical face type; for the combination of three defences (wave, scour and seepage defences) the sea embankment structural type of a composite cross section with a platform should be a good one, but it still should be suitable to local conditions. For the local stability of riprap slope blocks and wall face loose masonry blocks, according to the analyses of wave-induced seepage flow fields, calculating formulas are given and they are verified by model test on block stability of breakwaters. 展开更多
关键词 sea embankment structural type tidal stage variation wave stroke seepage flow stability analysis
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Structure and Magnetic Properties of Y(Fe_(1-x)Co_x)_ (11.3) Nb_(0.7)
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作者 罗广圣 李劲松 《Journal of Rare Earths》 SCIE EI CAS CSCD 2001年第1期25-28,共4页
The structure and magnetic properties of the intermetallic compounds Y(Fe 1- x Co x ) 11.3 Nb 0.7 ( x =0, 0 05, 0 1, 0 2) were studied by X ray diffraction and magnetic property measurements. ... The structure and magnetic properties of the intermetallic compounds Y(Fe 1- x Co x ) 11.3 Nb 0.7 ( x =0, 0 05, 0 1, 0 2) were studied by X ray diffraction and magnetic property measurements. X ray diffraction patterns and thermomagnetic curves show that all compounds almost exhibit single phase. All Y(Fe 1- x Co x ) 11.3 Nb 0.7 compounds ( x =0, 0 05, 0 1, 0 2) crystallize in ThMn 12 type structure. Substitution of Co for Fe leads to a clear increasing of Curie temperature and a monotonic decreasing of lattice constants. At room temperature the composition dependence of saturation magnetization exhibits a maximum at about x =0 1~0 2. The magnetocrystalline anisotropy field at room temperature at first increases and then decreases with the increasing of Co content. 展开更多
关键词 rare earths ThMn 12 type structure Curie temperature saturation magnetization anisotropy field
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Improved ultrasonic differentiation model for structural coal types based on neural network
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作者 TIAN Zi-jian WANG Fu-zhong +1 位作者 LI Tao BAI Shan-shan 《Mining Science and Technology》 EI CAS 2009年第2期199-204,共6页
In order to solve the difficulty of detailed recognition of subdivisions of structural coal types,a differentiation model that combines BP neural network with an ultrasonic reflection method is proposed.Structural coa... In order to solve the difficulty of detailed recognition of subdivisions of structural coal types,a differentiation model that combines BP neural network with an ultrasonic reflection method is proposed.Structural coal types are recognized based on a suitable consideration of ultrasonic speed,an ultrasonic attenuation coefficient,characteristics of ultrasonic transmission and other parameters relating to structural coal types.We have focused on a computational model of ultrasonic speed,attenuation coefficient in coal and differentiation algorithm of structural coal types based on a BP neural network.Experiments demonstrate that the model can distinguish structural coal types effectively.It is important for the improved ultrasonic differentiation model to predict coal and gas outbursts. 展开更多
关键词 ULTRASONIC structural coal types BP neural network coal ultrasonic attenuation coefficient coal ultrasonic speed
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Efficient development of Type-Ⅱ TiO_2 heterojunction using electrochemical approach for an enhanced photoelectrochemical water splitting performance
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作者 Yuanxing Fang Yiwen Ma Xinchen Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第3期438-445,共8页
Type‐II‐heterojunction TiO2nanorod arrays(NAs)are achieved by a combination of reduced and pristine TiO2NAs through a simple electrochemical reduction.The heterojunction‐structured TiO2NAs exhibit an enhanced photo... Type‐II‐heterojunction TiO2nanorod arrays(NAs)are achieved by a combination of reduced and pristine TiO2NAs through a simple electrochemical reduction.The heterojunction‐structured TiO2NAs exhibit an enhanced photo‐efficiency,with respect to those of pristine TiO2NAs and completely reduced black TiO2.The improved efficiency can be attributed to a synergistic effect of two contributions of the partially reduced TiO2NAs.The light absorption is significantly increased,from theUV to the visible spectrum.Moreover,the type II structure leads to enhanced separation and transport of the electrons and charges.The proposed electrochemical approach could be applied to various semiconductors for a control of the band structure and improved photoelectrochemical performance. 展开更多
关键词 type II heterojunction structure Photoelectrochemical water splitting TIO2 Electrochemical reduction MODIFICATION
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Classification of regional agricultural structure:method and its application to China
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作者 Mou Ziping Lei Hongmei +1 位作者 Chen Guangping Li Xin 《Ecological Economy》 2008年第4期410-417,共8页
Regional agriculture is the basis of regional sustainable development, so sustainable regional agricultural development is essential to the sustainable development of the whole society and becomes the focus of global ... Regional agriculture is the basis of regional sustainable development, so sustainable regional agricultural development is essential to the sustainable development of the whole society and becomes the focus of global research. The classification of regional agricultural structure is the basic work of regional agriculture study. This paper constructs index system (27 indices) of regional agricultural structure types with the three big indices: natural resources, developmental level of the agro-economy, and agro-ecological conditions. This paper also endows weight to every sub-classification index by means of AHP and obtains the comprehensive evaluation value of the three types of indices with arithmetic average weight approach. The regional agricultural structure can be classified into eight types in accordance with this evaluation results. The empirical study of China shows that the 31 provinces (municipalities and autonomous regions) are of different agriculture structural types. Finally, countermeasures of sustainsable agricultural development are put forward for the different agriculture structure features. 展开更多
关键词 AGRO-ECOLOGY China Classification method Regional agriculture Structural type
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Influence of Structural Modification on Work-hardening Behaviour of Type 316 Stainless Steel
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作者 K.G.Samuel S.L.Mannan and P.Rodriguez (Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1998年第5期399-401,共3页
Work-hardening behaviour of type 316 austenitic stainless steel having difFerent initial dislocation structures introduced by swaging to various levels is analysed by a simplified Kock's model which takes into acc... Work-hardening behaviour of type 316 austenitic stainless steel having difFerent initial dislocation structures introduced by swaging to various levels is analysed by a simplified Kock's model which takes into account the structural changes through the dislocation accumulation and annihilation process during deformation. The dislocation accumulation and annihilation factors show a temperature and structure dependence. The dislocation annihilation factor shows a plateau or decreasing tendency in the dynamic strain ageing (DSA) temperature range. This is attributed as either due to dislocation accumulation being more pronounced than dislocation annihilation or as due to precipitates being formed at DSA temperatures acting as obstacles to dislocation motion in the DSA temperature range. 展开更多
关键词 WORK Influence of Structural Modification on Work-hardening Behaviour of type 316 Stainless Steel
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