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荔枝嫁接接位和接芽的异质性与成苗试验 被引量:1
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作者 艾明 《西部林业科学》 CAS 1991年第1期25-,65,共2页
荔枝嫁接目前在国内尚属攻关课题。广东省东莞县采用合接和切接法,福建省福清县用小苗嫁接成活率均为60%左右。由于成活率低,目前我国的荔枝栽培主要采用高压苗或实生苗,这给生产带来许多不便。本试验旨在摸索出一种嫁接成活率高的方法... 荔枝嫁接目前在国内尚属攻关课题。广东省东莞县采用合接和切接法,福建省福清县用小苗嫁接成活率均为60%左右。由于成活率低,目前我国的荔枝栽培主要采用高压苗或实生苗,这给生产带来许多不便。本试验旨在摸索出一种嫁接成活率高的方法,以解决荔枝生产中育苗难的问题,从而推动荔枝生产。 展开更多
关键词 荔枝嫁 接位 异质性 成苗率
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四教行位“接位”之研究
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作者 释圆明 《中国佛学》 2020年第1期171-181,共11页
"接位"在天台典籍中称为"被接",即别接通二谛、圆接通二谛、圆接别二谛及别接通三谛、圆接通三谛、圆接别三谛,以此论断惑证真的过程进行探究接位在四教行位的内容当中,其所扮演的角色是不可忽视的内容之一。根据... "接位"在天台典籍中称为"被接",即别接通二谛、圆接通二谛、圆接别二谛及别接通三谛、圆接通三谛、圆接别三谛,以此论断惑证真的过程进行探究接位在四教行位的内容当中,其所扮演的角色是不可忽视的内容之一。根据天台三大部,智■提出三藏教二乘行人不列入被接的范畴中,这牵扯到他们根性的问题。此中还含藏许多重要问题,由于被接的关系,行者可否不必次第断入,而可超入别、圆行位的问题、被接与观行之间的关系如何、智■设立被接的宗旨何在、被接在整体四教的位置为何?更重要的是日本学者张堂兴志在《被接における二、三の問題--蔵教の扱いをめぐって》中认为三藏教也可以被接,这就是本文主要提出质疑的地方。 展开更多
关键词 四教 接位 藏教
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提高太极柔力球反手位接抛球技术的探索与研究 被引量:1
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作者 陈杰 《科教文汇》 2011年第36期152-153,共2页
太极柔力球反手抛接球技术在比赛中的应用频率较高,提高太极柔力球反手抛接球技术对比赛的胜利尤为重要。在高校的体育教学中,学生在太极柔力球反手位接抛球应用上还存在很多不足。本文对如何提高太极柔力球的反手位接抛球技术进行了探... 太极柔力球反手抛接球技术在比赛中的应用频率较高,提高太极柔力球反手抛接球技术对比赛的胜利尤为重要。在高校的体育教学中,学生在太极柔力球反手位接抛球应用上还存在很多不足。本文对如何提高太极柔力球的反手位接抛球技术进行了探索与研究。 展开更多
关键词 高校 太极柔力球 反手抛球
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阿尔泰山楂嫁接西伯利亚花楸效果观察 被引量:3
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作者 古丽江.许库尔汗 张东亚 +1 位作者 安鹭 古丽森 《南方农业学报》 CAS CSCD 北大核心 2014年第8期1438-1442,共5页
【目的】研究阿尔泰山楂嫁接西伯利亚花楸的成活率及接穗生长量,为西伯利亚花楸在新疆引种及推广应用提供参考依据。【方法】2012-2013年采用高度10.0、30.0、60.0、100.0和140.0 cm,接位粗度2.0-3.0、3.5-4.5、5.0及≥5.5 cm的阿尔泰... 【目的】研究阿尔泰山楂嫁接西伯利亚花楸的成活率及接穗生长量,为西伯利亚花楸在新疆引种及推广应用提供参考依据。【方法】2012-2013年采用高度10.0、30.0、60.0、100.0和140.0 cm,接位粗度2.0-3.0、3.5-4.5、5.0及≥5.5 cm的阿尔泰山楂作砧木,分别嫁接不同产地采集的西伯利亚花楸接穗,观察、分析阿尔泰山楂不同高度和不同接位粗度对西伯利亚花楸嫁接成活率和接穗生长量的影响。【结果】西伯利亚花楸嫁接成活率随着砧木高度的降低和砧木接位粗度的增加而逐渐下降;砧木高度10.0-140.0cm时,接位粗度2.0-3.0 cm的西伯利亚花楸嫁接成活率极显著高于接位粗度3.5-4.5、5.0和≥5.5 cm的嫁接成活率(P0.05,下同),与接位粗度3.5-4.5和≥5.5 cm的接穗生长量差异极显著;砧木高度10.0cm时,各接位粗度的接穗生长量间无显著差异。【结论】高度30.0-100.0cm、接位粗度2.0-4.5cm的3-4年生阿尔泰山楂幼树最适宜作西伯利亚花楸嫁接砧木。 展开更多
关键词 西伯利亚花楸 阿尔泰山楂 砧木高度 砧木接位粗度 成活率 穗生长量
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提高杨梅嫁接成活率的技术措施 被引量:1
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作者 梁桂强 《农技服务》 2008年第4期42-42,共1页
从砧木选择、接穗选择、嫁接时间、嫁接方法、接后管理等方面介绍了提高杨梅嫁接成活率的技术措施。
关键词 杨梅 砧木 成活率 形成层 接位
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Effects of two modification methods on the mechanical properties of wood flour/recycled plastic blends composites: addition of thermoplastic elastomer SEBS-g-MAH and in-situ grafting MAH 被引量:1
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作者 宋永明 王清文 +2 位作者 韩广平 王海刚 高华 《Journal of Forestry Research》 SCIE CAS CSCD 2010年第3期373-378,399,400,共8页
The effect of maleic anhydride grafted styrene-ethylene- buty-lene-styrene block copolymer (SEBS-g-MAH) and in-situ grafting MAH on mechanical, dynamic mechanical properties of wood flour/recycled plastic blends com... The effect of maleic anhydride grafted styrene-ethylene- buty-lene-styrene block copolymer (SEBS-g-MAH) and in-situ grafting MAH on mechanical, dynamic mechanical properties of wood flour/recycled plastic blends composites was investigated. Recycled plastic polypro-pylene (PP), high-density polyethylene (HDPE) and polystyrene (PS), were mixed with wood flour in a high speed blender and then extruded by a twin/single screw tandem extruder system to form wood flour/recycled plastic blends composites. Results show that the impact properties of the composites were improved more significantly by using SEBS-g-MAH compatibilizer than by using the mixtures of MAH and DCP via reactive blending in situ. However, contrary results were ob-served on the tensile and flexural properties of the corresponding com-posites. In General, the mechanical properties of composites made from recycled plastic blends were inferior to those made from virgin plastic blends, especially in elongation break. The morphological study verified that the interfacial adhesion or the compatibility of plastic blends with wood flour was improved by adding SEBS-g-MAH or in-situ grafting MAH. A better interfacial bonding between PP, HDPE, PS and wood flour was obtained by in-situ grafting MAH than the addition of SEBS-g-MAH. In-situ grafting MAH can be considered as a potential way of increasing the interfacial compatibility between plastic blends and wood flour. The storage modulus and damping factor of composites were also characterized through dynamic mechanical analysis (DMA). 展开更多
关键词 COMPATIBILIZER COMPOSITES in-situ grafting recycled plastic blends wood flour
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Preparation and microstructure of in-situ(ZrB_2+Al_2O_3+Al_3Zr)_p/A356 composite synthesized by melt direct reaction 被引量:2
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作者 杨华静 赵玉涛 +2 位作者 张刚 张松利 陈登斌 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第3期571-576,共6页
(ZrB2+Al2O3+Al3Zr)/A356 composites were synthesized by melt direct reaction from A356-(K2ZrF6+KBF4+Na2B4O7) system.The phase compositions and the microstructures of the as-prepared composites were investigated... (ZrB2+Al2O3+Al3Zr)/A356 composites were synthesized by melt direct reaction from A356-(K2ZrF6+KBF4+Na2B4O7) system.The phase compositions and the microstructures of the as-prepared composites were investigated by XRD,SEM and TEM.The results show that the reinforcements are composed of ZrB2 and Al2O3 ceramic phase particles and Al3Zr intermetallic particles.The ZrB2 particulates are easy to join together to form some particle clusters and distribute along the α(Al) grain boundary.The morphologies of the ZrB2 particulates are in hexagon-shape with the size of about 50 nm.The TEM investigation results of Al3Zr indicate that Al3Zr grows in the form of facet with the length-diameter ratio of about 20.The morphologies of Al2O3 particles are in rectangular-shape and ellipsoidal-shape,with the size of about 0.1 μm.In addition,the interfaces of the matrix and particles are net and no interfacial outgrowth is observed. 展开更多
关键词 aluminum matrix composites melt direct reaction in situ particle MICROSTRUCTURE
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Evidence of the Role of Carbon Vacancies in Nickel-Based Ohmic Contacts to n-Type Silicon Carbide 被引量:1
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作者 郭辉 张义门 张玉明 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第1期5-9,共5页
N-wells are created by P+ ion implantation into Si-faced p-type 4H-SiC epilayer. Ti and Ni are deposited in sequence on the surface of the active regions. Ni2Si is identified as the dominant phase by X-ray diffracti... N-wells are created by P+ ion implantation into Si-faced p-type 4H-SiC epilayer. Ti and Ni are deposited in sequence on the surface of the active regions. Ni2Si is identified as the dominant phase by X-ray diffraction (XRD) analysis after metallization annealing. An amorphous C film at the Ni2 Si/SiC interface is confirmed by an X-ray energy-dispersive spectrometer (XEDS). The Ni2Si and amorphous C film are etched away selectively,followed by deposition of new metal films without annealing. Measurement of the current-voltage characteristics shows that the contacts are still ohmic after the Ni2 Si and amorphous C film are replaced by new metal films. The sheet resistance Rsh of the implanted layers decreases from 975 to 438f2/D, because carbon vacancies (Vc) appeared during annealing,which act as donors for electrons in SiC. 展开更多
关键词 NI ohmic contact silicon carbide carbon vacancies P^+ ion implantation
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Contact Problem in Decagonal Two-Dimensional Quasicrystal 被引量:6
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作者 周旺民 范天佑 《Journal of Beijing Institute of Technology》 EI CAS 2001年第1期51-55,共5页
As a new structure of solid matter quasicrystal brings profound new ideas to the traditional condensed matter physics, its elastic equations are more complicated than that of traditional crystal. A contact problem of ... As a new structure of solid matter quasicrystal brings profound new ideas to the traditional condensed matter physics, its elastic equations are more complicated than that of traditional crystal. A contact problem of decagonal two? dimensional quasicrystal material under the action of a rigid flat die is solved satisfactorily by introducing displacement function and using Fourier analysis and dual integral equations theory, and the analytical expressions of stress and displacement fields of the contact problem are achieved. The results show that if the contact displacement is a constant in the contact zone, the vertical contact stress has order -1/2 singularity on the edge of contact zone, which provides the important mechanics parameter for contact deformation of the quasicrystal. 展开更多
关键词 decagonal two-dimensional quasicrystal contact problem stress and displacement
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Ohmic Contact Properties of Multi-Metal Films on n-Type 4H-SiC
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作者 韩茹 杨银堂 +2 位作者 王平 崔占东 李亮 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第2期149-153,共5页
An investigation of Au/Ti/Ni and Au/Ti/Pt ohmic contacts to n-type 4H-SiC and the behavior of metal films on SiC with thermal anneals is reported. Specific contact resistance as low as 2. 765 x 10^-6Ω·cm^2 was a... An investigation of Au/Ti/Ni and Au/Ti/Pt ohmic contacts to n-type 4H-SiC and the behavior of metal films on SiC with thermal anneals is reported. Specific contact resistance as low as 2. 765 x 10^-6Ω·cm^2 was achieved after rapid thermal annealing in N2 for 2min at 950℃. SIMS analysis shows that the formation of Ni silicide after annealing supported a number of carbon atoms' outdiffusion from the SiC to form interstitial compound TiC. This process can create abundant C vacancies near the interface. It is the carbon defect layer that enhances the defect-assisted tunneling. The interface band structure within the defect level could make it clear why the metal-SiC contacts become ohmic during annealing. 展开更多
关键词 silicon carbide ohmic contact carbon vacancy interface band structure
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Floc flotation of marmatite fines in aqueous suspensions induced by butyl xanthate and ammonium dibutyl dithiophosphate
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作者 张婷 覃文庆 +1 位作者 杨聪仁 黄水鹏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第5期1578-1586,共9页
The hydrophobic flocculation of marmatite fines in aqueous suspensions induced by butyl xanthate (KBX) and ammonium dibutyl dithiophosphate (ADD) was investigated using laser particle size analysis, microscopy ana... The hydrophobic flocculation of marmatite fines in aqueous suspensions induced by butyl xanthate (KBX) and ammonium dibutyl dithiophosphate (ADD) was investigated using laser particle size analysis, microscopy analysis, electrophoretic light scattering, contact angle measurement and infrared spectroscopy. The studies were performed on single minerals with size 〈20 μm by varying several parameters, including pH, collector concentration and kerosene addition. The results show that the floc fotation closely correlated with the size of flocs and the particle hydrophobicity, but was not lowered with increasing the particle surface charges due to collector adsorption. Under good operating conditions, the floc flotation of marmatite fines as a function of KBX and ADD can all reach floatability over 90%, in comparison with conventional flotation obtaining floatability of about 60%. It also has been found that a small addition of kerosene greatly improved the floc flotation because of the formation of oil films on marmatite particles. The results of FTIR spectra indicate that adsorption of the two collectors onto marmatite were chemical adsorption. 展开更多
关键词 hydrophobic flocculation marmatite fines zeta potential contact angle butyl xanthate (KBX) ammonium dibutyl dithiophosphate (ADD) KEROSENE
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Effect of Ti-Si-Mg-Al wire on microstructure and mechanical properties of plasma arc in-situ welded joint of SiC_p/Al composites 被引量:3
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作者 雷玉成 薛厚禄 +1 位作者 胡文祥 闫久春 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期305-311,共7页
The influence of Ti-Si-Mg-AI wire on microstructure and mechanical properties of SiCp/A1 metal matrix composite joints produced by plasma arc in-situ weld-alloying was investigated. Argon-nitrogen mixture was used as ... The influence of Ti-Si-Mg-AI wire on microstructure and mechanical properties of SiCp/A1 metal matrix composite joints produced by plasma arc in-situ weld-alloying was investigated. Argon-nitrogen mixture was used as plasma gas and Ti-Si-Mg-A1 flux-cored wires as filled composites. Weldments were submitted to tensile test. Meanwhile, the macro morphology and microstructure of the joints were examined. The result shows that the formation ofneedie-like harmful phase A14C3 is effectively inhibited and the wettability of molten pool is improved by adding Ti-Si-Mg-A1 flux-cored wires. With 15Ti-5Si-5Mg-A1 flux-cored wire as filled composite, the maximum tensile strength of the welded joint is 267 MPa, which is up to 83% that of the matrix composites under annealed condition. 展开更多
关键词 plasma arc in-situ welding aluminium matrix composites Ti-Si-Mg-A1 flux-cored wire
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1999是XML年吗?
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作者 映雪 《中国经济和信息化》 1999年第9期27-27,共1页
“XML允许程序员们轻松地创建极易索引的网页,正是被这一非凡功能深深吸引,商业用户开始热衷于XML”——Zona研究有限公司。
关键词 HTML SGML XML文件 数据元素 文档 客户机 接位 安全和认证 迁移势 数据源对象
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Importance and Design Requirements of Equipotential Connection in Lightning Protection Engineering
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作者 祝新宇 张影 +1 位作者 钟莉 李金义 《Agricultural Science & Technology》 CAS 2013年第8期1201-1203,1208,共4页
The role played by equipotential connection in lightning protection was summarized in terms of lightning protection,static electricity,electromagnetic shielding,protection from electric shocks,and earth fault protecti... The role played by equipotential connection in lightning protection was summarized in terms of lightning protection,static electricity,electromagnetic shielding,protection from electric shocks,and earth fault protection.In addition,drawbacks of independent grounding and common grounding were concluded.According to standards and researches,such as Building Lightning Protection Design Standard (GB50057-2010),further demands and rules of equipotential connection in lightning protection engineering were proposed,providing references for lightning prevention design,construction and examination by related scientific workers and staffs. 展开更多
关键词 Lightning protection design Equipotential connection Common earthingsystem National standard
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Concatenated Trellis Coding and CPM for DS/SSMA Communications in Rayleigh Fading Channel
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作者 仰枫帆 梁树雄 毕光国 《Journal of Southeast University(English Edition)》 EI CAS 1999年第1期9-16,共8页
In this paper, direct sequence spread spectrum multiple access (DS/SSMA) communication system employing serially concatenated trellis coded modulation (TCM) and continuous phase modulation (CPM) over flat Rayleigh fa... In this paper, direct sequence spread spectrum multiple access (DS/SSMA) communication system employing serially concatenated trellis coded modulation (TCM) and continuous phase modulation (CPM) over flat Rayleigh fading channel are presented. The performance of this concatenated TCM/CPM DS/SSMA system is exploited by the theoretical analysis and numerical simulations. The results demonstrate that significant improvements in error probability of this DS/SSMA system over the system with single TCM or CPM of different modulation indices can be achieved under the same conditions. 展开更多
关键词 concatenated TCM/CPM direct sequence spread spectrum multiple access Rayleigh fading channel
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Electrochemical corrosion of Sn-0.75Cu solder joints in NaCl solution 被引量:3
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作者 高艳芳 程从前 +2 位作者 赵杰 王丽华 李晓刚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第4期977-982,共6页
The corrosion behaviors of Sn-0.75Cu solder and Sn-0.75Cu/Cu joint in 3.5% NaCl(mass fraction) solution were studied by potentiodynamic polarization test and leaching measurement.The polarization curves indicated th... The corrosion behaviors of Sn-0.75Cu solder and Sn-0.75Cu/Cu joint in 3.5% NaCl(mass fraction) solution were studied by potentiodynamic polarization test and leaching measurement.The polarization curves indicated that the corrosion rate of Sn-0.75Cu solder was lower than that of Sn-0.75Cu/Cu joint.The morphology observation and phase composition analysis on the corroded product at each interesting potential suggested that Sn3O(OH)2Cl2 formed on the surface of Sn-0.75Cu solder at active dissolution stage.As the potential increased from active/passive transition stage,all the surface of Sn-0.75Cu solder was covered by the Sn3O(OH)2Cl2 and some pits appeared after the polarization test.Compared to the Sn-0.75Cu solder alloy,much more Sn3O(OH)2Cl2 formed at active dissolution stage and the pits with bigger size were observed after polarization test for the Sn-0.75Cu/Cu solder joints.The leaching test confirmed that the faster electrochemical corrosion rate resulted in the larger amount of Sn released from the Sn-0.75Cu/Cu solder joints. 展开更多
关键词 Sn-0.75Cu solder Sn-0.75Cu/Cu joint CORROSION potentiodynamic polarization leaching behavior corroded products
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Automatic IQ Phase Calibration Design in a 2.4GHz Direct Conversion Receiver 被引量:1
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作者 刘瑞峰 李永明 +1 位作者 陈弘毅 王志华 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第9期1531-1536,共6页
An automatic IQ phase calibration method implemented in a 2.4GHz direct conversion receiver is proposed. It uses a delay locked loop (DLL) with a proposed quadrature phase detector to greatly reduce the phase error.... An automatic IQ phase calibration method implemented in a 2.4GHz direct conversion receiver is proposed. It uses a delay locked loop (DLL) with a proposed quadrature phase detector to greatly reduce the phase error. The receiver is fabricated in a 0.18μm CMOS process. Measurements show that the IQ phase error can be calibrated within 1°,which satisfies the system requirement. 展开更多
关键词 direct conversion receiver IQ phase calibration CMOS process quadrature phase detector
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TLP bonding of dissimilar FSX-414/IN738 system with MBF80 interlayer: Prediction of solid/liquid interface location 被引量:6
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作者 B.ABBASI KHAZAEI G.ASGHARI R.BAKHTIARI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第4期996-1003,共8页
Isothermal solidification process of a dissimilar transient liquid phase (TLP) bonding of FSX-414/MBF80/IN738 system was simulated by finite difference method. The TLP joint model was divided into two parts and a mo... Isothermal solidification process of a dissimilar transient liquid phase (TLP) bonding of FSX-414/MBF80/IN738 system was simulated by finite difference method. The TLP joint model was divided into two parts and a moving liquid /solid interface model was used for the parts. Diffusion equations were solved for each half of the joints simultaneously up to the end of isothermal solidification. The completion time of isothermal solidification, concentration profiles and position of the solid/liquid interface for each half were calculated. The intersection of the solid/liquid interfaces of two halves was considered the end of isothermal solidification. To obtain some required diffusion data, TLP bonding of FSX-414/MBF80/IN738 was performed at different temperature and time under vacuum atmosphere. The calculated results show good agreement with the experimental results. 展开更多
关键词 SUPERALLOYS dissimilar TLP bonding interface location SIMULATION
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Design of Demodulation System of Interferometric Sensor Based on Labview 被引量:3
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作者 XU Wei WANG Jin-hai +2 位作者 CHEN Cai-he ZHENG Yu ZHANG Cheng 《Semiconductor Photonics and Technology》 CAS 2008年第2期115-120,共6页
For the modified demodulation arithmetic of 3×3 coupler, the processing software built on the basis of Labview is able to demodulate asymmetric 3×3 coupler signal and do further spectrum analysis. It shows t... For the modified demodulation arithmetic of 3×3 coupler, the processing software built on the basis of Labview is able to demodulate asymmetric 3×3 coupler signal and do further spectrum analysis. It shows that the measured frequency ranges from 10 Hz to 1 000 Hz and phase range is covered by -10 rad^10 rad. The phase sensitivity is 0.5 V/rad. This system is proved to show high resolution and wide dynamic range. 展开更多
关键词 asymmetric 3×3 coupler phase demodulation LABVIEW software demodulation interferometric sensor
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Foreign Direct Investment with Chinese Characteristics:A Middle Path Between Ownership-Location-Internalization Model and Linkage-Leverage-Learning Model 被引量:8
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作者 SI Yuefang Ingo LIEFNER WANG Tao 《Chinese Geographical Science》 SCIE CSCD 2013年第5期594-606,共13页
The majority of multinational enterprises (MNEs) traditionally originate from developed countries. In the last ten years, however, there has been dramatic growth in foreign direct investment (FDI) from China. It i... The majority of multinational enterprises (MNEs) traditionally originate from developed countries. In the last ten years, however, there has been dramatic growth in foreign direct investment (FDI) from China. It is a comparatively new phenomenon that challenges the classic FDI theories. In this paper, we review the pros and cons of two important theories, known as the Owner- ship-Location-Internalization (0LI) model and Linkage-Leverage-Learning (LLL) model, and use the statistical data and company case studies from China to test the plausibility of these two models. We believe that neither of them suits totally: the OLI model is quite use- fill for understanding FDI from China to developing economies, while the LLL model is more powerful for explaining the FDI to de- veloped economies. We argue that the companies from China attain a very advantageous position as intermediates in the global economy They may catch up with the first movers if they integrate OLI-led and LLL-led FDI within one firm. This combination can bring to- gether the most advanced knowledge acquired in developed economies with the knowledge about adaptation needs and the needs for cost reduction in production as expressed in developing economies. It may also accelerate the knowledge transfer globally. We thus fill a gap in research into the geographical pattern of Chinese FDI and offer a deeper understanding of the internationalization of Chinese MNEs and revolving knowledge transfer. 展开更多
关键词 outward foreign direct investment (FDI) 0wnership-Location-Internalization model Linkage-Leverage-Learning model China
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