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放热峰     
相关语句
  exothermic peak
     An exothermic peak in DSC tracing was presented for glassy alloys Fe_(24)Zr_(76) and Ni_(24)Zr_(76), but two or three peaks for Co_(21)Zr_(79), Pd_(24.5)Zr_(75.5), Cu_(45)Zr_(55) and Cu_(67.5)Ti_(32.5).
     在Fe_(24)Zr_(76),Ni_(24)Zr_(76)合金玻璃体中呈现出一个放热峰,而Co_(21)Zr_(79),Pd_(24.5)Zr_(75.5),Cu_(45)Zr_(55)和Cu_(67.5)Ti_(32.5)则有两个或三个放热峰
短句来源
     The exothermic peak at 940℃ for the formation of 3C_2S·3CaSO_4·CaF_2 appears after an endothermic valley at 910℃ corresponding to eutcetic point.
     在940℃形成3C_2S·3CaSO_4·CaF_2时的放热峰是位于在910℃共熔物熔融时吸热谷之后。
短句来源
     24%,the temperature of DTA exothermic peak is 378.7 C withexothermic peak temperature extrapolated is 367.7t.
     差热分析放热峰温度为378.7℃,放热峰外推温度为367.7℃。
短句来源
     When oxygen concentration is more than 6.32%, DTA thermographs of all sample exist two exothermic peak, the amounts of combustion volatiles and char residues increase with oxygen concentration.
     当氧气浓度大于6.32%时,各样品DTA曲线上均有两个明显放热峰,并且随着氧气浓度的增加,DTA曲线放热峰越尖锐,放热峰面积越大,说明氧气浓度越大,在两阶段失重过程中更多的挥发分物质和固体炭化物参与燃烧。
短句来源
     The results show that the high-temperature and low-temperature peaks of AP merge into a single high and large exothermic peak after the addition of(Co-B) amorphous alloy,and the peak temperature decreased with increasing(Co-B) content.
     结果表明,加入CO-B非晶态合金后AP的高低温放热峰相连,合并成一个高而大的放热峰,且峰温有很大程度的降低,这说明纳米CO-B非晶态合金对AP热分解有很好的催化活性.
短句来源
更多       
  exothermic peaks
     Two exothermic peaks were observed at 341. 6℃and 406. 2℃, which respectively corresponded to form the new phases Ni_5P_2 and Ni_3P in the differential thermal analysis.
     差热分析研究发现,在341.6℃和406.2℃有两个放热峰,分别对应于新相Ni5P2和Ni3P的形成。
短句来源
     The exothermic peaks of the formation of AFt and AFm appeared in hydrated exotermic curves of this cements,while the peaks of C-H-S gel and Ca(OH) 2 were not.
     在该水泥的 1天水化放热曲线上仅出现了AFt及AFm的形成放热峰 ,未出现C -S -H凝胶及Ca(OH) 2 的快速形成放热峰
短句来源
     It was found that there are five exothermic peaks in the DTA curve of LPCNi3.55Co0.75Mn0.4Al0.3 alloy, named a-b-c-d-e in turn.
     城大母博士李位论文火加热过程中的变化,发现:在LPCNi3,55Co075Mn0.4AI众。 合金的DTA曲线上呈现出5个放热峰:a一b一c一d一e。
短句来源
     Conclusions such as hydration rate and hydration process can be accelerated with the increase of temperature, and at higher temperatures there are the trend to overlap the exothermic peaks of C3A, C3S and C2S one another are given.
     提出了随温度升高水泥水化速度加快,并在较高温度下C_3A、C_3S、C_2S放热峰存在相互重叠的趋势;
短句来源
     Three exothermic peaks are respectively attributed to NiAl3 formation by solid-solid diffusion of Ni and Al power, Ni2Al3 formation by liquid eutectic spreading on the surface of Ni power, and Ni2Al3 and NiAl formation by diffusion.
     第二放热峰系液态共晶与Ni反应生成Ni2Al3所致; 第三放热峰系液相中的Al通过扩散与Ni反应生成Ni2Al3等放热所致;
短句来源
更多       
  exothermal peak
     ②the first curing exothermal peak was at 150~240 ℃;
     ②在150~240℃范围内出现一个宽广、平缓的固化放热峰
短句来源
     the temperature of DTA exothermal peak has been promotedto 391 .9C with exothermal peak temperature extrapolated of 378.TC,the temperatureof DTA endothermic peak is 486.5 C with endothermic peak temperature extrapolatedis 475.8C.
     差热分析DTA放热峰温度提高到391.9℃,放热峰外推温度提高到了378.7℃,而吸热峰温度为486.5℃,吸热外推温度为475.8℃。
短句来源
     The Fe_(86)P_(14)grain growth is initiated above 745℃ with a steady exothermal peak on DTAcurve.
     温度超过745℃,Fe_(86)P_(14)进入晶粒长大阶段,出现平缓的放热峰.
短句来源
     At first exothermal peak temperature of 820℃,it is found that a surface-induced crystallization is dominated and anorthite(CaAl2Si2O8)as major phase and wollastonite(CaSiO3)as minor phase are precipitated.
     在第一放热峰温度(820℃)析晶时,玻璃样品为表面析晶,析出晶体为钙长石(CaAl2Si2O8)和硅灰石(CaSiO3)。
短句来源
     The exothermal peak in the differential scanning calorimetry (DSC) curves for ultrafineZrO, and ultrafine Y,O,--ZrO, is formed by crystallization of ZrO, or Y:O,--ZrO,from amorphous to tetragonal crystallites.
     ZrO_2及Y_2O_3-ZrO_2在差示扫描量热(DSC)曲线上400~500℃间出现的放热峰对应其由无定型向四方晶系的转化。
短句来源
更多       
  exothermal peaks
     The results of DSC testing show that only one exothermal peak appears in the DSC curve for Sb Se based alloy. the corresponding temperature is about 220℃. However,two exothermal peaks appear in the DSC curve for alloys GeSb 2Te 4 and GeSb 4Te 4.The corresponding temperatures are 140℃ and 200℃ respectively,and there is a slight difference depending on the heating rate.
     利用DSC对Sb Se系和Ge Sb Te系粉末热力学参数进行了研究 ,对于Sb Se系合金 ,仅在温度为 2 2 0℃左右时出现一个放热峰 ,而对于GeSb2 Te4 与GeSb4 Te4 合金 ,分别在 140℃及2 0 0℃左右各出现一个放热峰 ,加热速度不同放热峰出现温度略有差别
短句来源
     In DSC heating-up curve of MA powder, four exothermal peaks with different strength appear, which are corresponding to the structure relaxing process of distorted nanocrystalline supersaturate solid solution, crystallization process of trace amorphous phases and phase precipitation of supersaturate solid solution, respectively.
     DSC升温曲线中,出现4个不同强度的放热峰,依次发生了纳米晶过饱和固溶体的结构弛豫、非晶晶化以及过饱和固溶体相析出等过程,且相析出过程分两个阶段完成;
短句来源
     (2) four exothermal peaks with different intensity appeared in DSC heating-up curves, these peaks corresponded to structural relaxation of distorted nanocrystalline supersaturate solid solution, crystallization of small quantity amorphous and phase precipitation of supersaturate solid solution, respectively.
     (2)在DSC的升温曲线中,分别出现四个强弱不一的放热峰,依次对应着发生了畸变的纳米晶过饱和固溶体的结构弛豫过程、少量非晶晶化过程以及过饱和固溶体的相析出过程,且过饱和固溶体析出过程分两个阶段完成;
短句来源
     Compared with DSC analysis, two exothermal peaks were examined during the crystallization process, corresponding to mLLDPE and EVA centralized regions respectively.
     对比DSC分析结果来看,结晶过程中观察到的两个放热峰分别对应着mLLDPE和EVA的富集区。
短句来源
     A comparison of the study on the crystallization of the glasses in argon with that in the air suggests that the second exothermal peaks are oxidation peaks.
     通过对该类玻璃在氩气氛和在空气中的晶化研究,说明第二放热峰是氧化峰。
短句来源
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      exothermic peak
    At absorpbed dose of 5 MGy the first exothermic peak is shifted by 15-20°C; in this case, both exothermic peaks coalesce and the oxidation can be considered as single-stage process starting at 110°C.
          
    DSC thermograms for the curing of C1P and C2P with benzoyl peroxide (BPO) and NMA/MTHPA showed two distinct exothermic peak positions, Tp and T1p, due to the curing of esterified fraction and epoxy groups, respectively.
          
    The results show that the supported Pd catalysts have two exothermic peaks at around 312 °C and 435 °C in the DSC thermograms, respectively, while the supported Pt catalysts have one exothermic peak at approximately 345 °C.
          
    Using DSC, the exothermic peak due to precipitation from the supersaturated α-Al matrix was observed in the range of 200-250°C during continuous heating of atomized powder, and the size of the peaks increased with decreasing powder size.
          
    Metastable phase with structure type of sigma phase (e.g., in Fe-Cr alloys) was observed in melt spun ribbons by rapid heating or annealing at temperatures below the first exothermic peak of DTA curve.
          
    更多          
      exothermic peaks
    In the derivatograms of the anion exchanger in the nitrate form there are one endothermic and two exothermic peaks (~100, 160-180, and 200-220°C).
          
    At absorpbed dose of 5 MGy the first exothermic peak is shifted by 15-20°C; in this case, both exothermic peaks coalesce and the oxidation can be considered as single-stage process starting at 110°C.
          
    The homogeneity of the product is correlated with the temperature of exothermic peaks above 1100 K due to the crystallization of MgTiO3, but not with the endothermic peaks around 650 K.
          
    During the thermal analysis, the cross-linked co-polymers exhibited two exothermic peaks and one endothermic peak, indicating the presence of HTPB and GAP polymeric chain segments in the co-polymers.
          
    During the baking of the dry-gel powder, two exothermic peaks occur, followed by the formation of Li2O and Co3O4 and then the combination of LiCoO2, which is testified by DTA and XRD.
          
    更多          
      exothermal peak
    The Raman spectra of Li2O · 7GeO2 glasses, which are heat treated under different conditions at temperatures near the temperature corresponding to the first exothermal peak in the DTA curve, are measured in the frequency range 20-1100 cm-1.
          
    We have found that there is an exothermal peak on the DTA curve of nanostructured γ-Fe2O3 sample and that this peak is not repeatable.
          
    The XRD microstructure analysis confirms for the first time that this exothermal peak corresponds to the structural phase transition from γ-Fe2O3 to α-Fe2O3.
          
    The DTA curve showed that boric acid treated basswood has an exothermal peak at 420°C, indicating the exothermal polymerization reaction of charring.
          
    DSC data show that prolonged exposure to UV light and post-thermal treatment can decrease the Tonset and Tpeak of the exothermal peak and the condensation temperature between TiOH, and increase ΔH of the exothermal peak.
          
    更多          
      其他


    Ferrifayalite is a Fe~(3+)-rich silicate mineral. It occurs in the Anshan type-like magnetite deposit of Liaoning Province. Ferrifayalites distribute unevenly and aggregate commonly as bands, with a percentage usually lower than that of magnetites, occasionally reaching to 10%. Crystals of ferrifayalite mainly xenomorphic granular, 0.25—0.7mm. to individually 1mm in diameter. Color blackish, luster submetallic with blackish brown streak. Cleavages of (100) distinct, (010) indistinct. Non magnetic but mediumly...

    Ferrifayalite is a Fe~(3+)-rich silicate mineral. It occurs in the Anshan type-like magnetite deposit of Liaoning Province. Ferrifayalites distribute unevenly and aggregate commonly as bands, with a percentage usually lower than that of magnetites, occasionally reaching to 10%. Crystals of ferrifayalite mainly xenomorphic granular, 0.25—0.7mm. to individually 1mm in diameter. Color blackish, luster submetallic with blackish brown streak. Cleavages of (100) distinct, (010) indistinct. Non magnetic but mediumly electro magnetic. Hardness 5.5—6.5 S. G. 3.967.Opaque. Under reflected polarizing microscope, grey in color, anisotropic and with distinct bireflexicon (reflection-pleochroism). Indices of refraction were calculated from reflectivities : ∥ cleavage, N_(546)=2.03±0.04, N_(589)=2.01±0.04;⊥cleavage, N_(546)=2.04±0.04, N_(589)=2.03±0.04. Biref. △_(546)=0.01; △_(589)=0.02.Chemical composition of ferrifayalite rather simple and stable Pe_2O_3 content high, occasionally reaching to 45.1%. Th crystallochemical formula is Fe~(2+)Fe~(3+)(SiO_4)_2.Monoclinic in system. Space group C_(2h)~5-P2_1/b.a=4.808, b=10.171, c=5.824, α=90°.X-ray powder strong lines: 3.488(10), 2.774(9), 2.521(10), 2.405(7), 2.246(7), 1.745(8) etc., some with scattering phenomena.In the curve of D. T. A., there is one heatemitting peak at 700℃.In the infrared absorption spectrograph there are SiO_4 deformation vibration at 840—1120 frequency region.In single crystal structure analysis uses were made with equi-inclination weissenberg multiple film method according to olivine orientation. We had collected seven sets of diffraction photographs of 0kl-2kl, hk0-kh2, hOl, totally 246 independent diffraction spots. The photographs show V_h-D_(2h)-mmm laue symmetry, and on account of the crystal possessing neither gliding plane n nor symmetrical plane m of the spacegroup of olivine D_(2h)~(16)-Pbnm, it is thus determined the sole space group to be C_(2h)~5-P2_1/b. The parameters of the coordinates of every kind atom are determined after crystallochemistry principle and Patterson projection pattern. R_(oxt)=0.23, R_(hko)=0.21.The crystal structure analysis shows that ferrifayalite is an independent mineral with ordered vacant lattice position olivine type structure. It shares some features in common with that of olivine structure type, including a similar orientation of the tetrahedron, but it is different from olivine structure type in consisting of the edgesharing octahedral linear chains instead of the zigzag chains. Fe~(2+) situate at the center of symmetry of olivine, but it is vacant in this mineral at (0, 0, 1/2) and (1/2, 1/2, 1/2) symmetrical centers. Thus the structure becomes an ordered vacant lat- tice position structure.The cleavages, hardness optical properties etc. can all be properly explained with structure.After comparing the chemical composition, physical properties and size of unit cell of this mineral with that of MnO_2-bearing ferrifayalite informed by I. W. Ginsburg, the authors of present paper believe that these wo minerals possibly belong to the same kind of mineral, but the structure as they thought is quite different to ours.

    高铁铁橄榄石(ferrifayalite)是富含Fe~(3+)的硅酸盐矿物,产于我国辽宁省似鞍山式磁铁矿矿床中。它在矿石中分布不均匀,多呈条带状产出,含量一般低于磁铁矿,有时含量可高达10%,晶体主要呈他形粒状,粒径0.25—0.7毫米,个别达1毫米。黑色,半金属光泽,条痕为黑褐色,(100)解理清楚,(010)解理不清楚。有中等磁性,具中等电磁性,硬度5.5—6.5,比重3.967。在偏光镜下不透明,反射光下为灰色,非均质,双反射清楚,折射率是由反射率换算的,在‖解理时N_(546)=2.03±0.04,N_(589)=2.01±0.04;⊥解理时,N_(546)=2.04±0.04,N_(589)=2.03±0.04;重屈折△_(546)=0.01,△_(589)=0.02。化学成分简单,较稳定,Fe_2O_3含量高,可达45.1%,结晶化学式为Fe~(3+)Fe_2~(3+)[SiO_4]_2。该矿物属单斜晶系,空间群为C_(2h)~5—P2_1/b。a=4.808,b=10.171,c=5.824,α=90°。粉晶强谱线有:3.488(10),2.774(9),2.521(10),2.405(7),2...

    高铁铁橄榄石(ferrifayalite)是富含Fe~(3+)的硅酸盐矿物,产于我国辽宁省似鞍山式磁铁矿矿床中。它在矿石中分布不均匀,多呈条带状产出,含量一般低于磁铁矿,有时含量可高达10%,晶体主要呈他形粒状,粒径0.25—0.7毫米,个别达1毫米。黑色,半金属光泽,条痕为黑褐色,(100)解理清楚,(010)解理不清楚。有中等磁性,具中等电磁性,硬度5.5—6.5,比重3.967。在偏光镜下不透明,反射光下为灰色,非均质,双反射清楚,折射率是由反射率换算的,在‖解理时N_(546)=2.03±0.04,N_(589)=2.01±0.04;⊥解理时,N_(546)=2.04±0.04,N_(589)=2.03±0.04;重屈折△_(546)=0.01,△_(589)=0.02。化学成分简单,较稳定,Fe_2O_3含量高,可达45.1%,结晶化学式为Fe~(3+)Fe_2~(3+)[SiO_4]_2。该矿物属单斜晶系,空间群为C_(2h)~5—P2_1/b。a=4.808,b=10.171,c=5.824,α=90°。粉晶强谱线有:3.488(10),2.774(9),2.521(10),2.405(7),2.246(7),1745(8)等,线条有弥散现象。差热分析曲线上700℃处有一放热峰。红外光谱在460—620频率段为SiO_4为变形振动,840—1120频率段为SiO_4的伸缩振动。单晶结构分析系用等倾斜魏森堡多重胶片法按橄榄石定向,共收集了0kl—2kl,hk0—hk2,h0l七套照片,246个非零独立衍射点。照片上显示出V_h—D_(2h)—mmm劳埃对称,因为在[010]方向的魏森堡图上见到约40%的h+l=2n+1弱衍射点以及在P(VW)原子间向量投影图上没有P(OW)的哈格峰,这就证明晶体中不存在橄榄石空间群D_(2h)~(16)—Pbnm中的n滑移面和m对称面。所以确定唯一空间群C_(2h)~5—P2_1/b。各种原子的坐标参数是根据结晶化学原理和原子间向量投影图确定的R_(okl)=0.23,R_(hko)=0.21。晶体结构分析表明,高铁铁橄榄石是一具有序缺席橄榄石结构型的独立矿物,在结构上具有橄榄石结构的某些相同特征,包括一个相同的四面体方位,但所不同的是以公用稜连结的八面体直链代替了锯齿状链。Fe~(2+)位于对称中心1上。但本矿物在(0,0,1/2)及(1/2,1/2,1/2)对称中心位置上Fe~(2+)作有序空缺席来实现。矿物的解理、硬度、光性等物性在结构上都得到合理的解释。作者对高铁铁橄榄石结构分析时发现该矿物与铁橄榄石之间存在一个Fe~(3+)代替Fe~(2+)的异价类质同象系列的问题。Fe~(2+)被Fe~(3+)按其xFe~(2+)换2/3xFe~(3+)的方式所代替,因此在一些等值结构位置上形成空缺,当空缺位置由无序缺席代替变为有序缺席代替时,其结果必然导致晶体结构由高对称变为低对称。高铁铁橄榄石就是这种量变到质变的产物。它属于不完全的类质同象系列。按元素周期表对角线发展的类质同象代替规律,作者认为也适用于过渡元素的异价离子间的置换,从高铁铁橄榄石这一事实与在其他硅酸盐矿物中所观察到的情况是一致的。根据矿物的化学成分、物理性质及晶胞大小与I. W.金兹堡等人所报道的含MnO_2Ferrifayalite比较,本文作者认为二者可能属于同类矿物,但他们认为该矿物是由锰铁橄榄石+Fe_2O3、+SiO_2三个物相所组成的非独立矿物,他们推测该矿物的结构与本文显然是不相同的。

    DSC, dynamic mechanical properties and density measurement have been performed for PET samples heat treated or stretched at different conditions. It was found that the position of the exothermal peak is obviously dependent on the degree of crystallization and orientation of the samples. The amount of heat calculated from the exothermal peak is not uniquely determined by the density of the sample, but is linearly dependent on tan 6 at 70℃, which can be used as a measure of the amount of amorphous state within...

    DSC, dynamic mechanical properties and density measurement have been performed for PET samples heat treated or stretched at different conditions. It was found that the position of the exothermal peak is obviously dependent on the degree of crystallization and orientation of the samples. The amount of heat calculated from the exothermal peak is not uniquely determined by the density of the sample, but is linearly dependent on tan 6 at 70℃, which can be used as a measure of the amount of amorphous state within a sample. At this stage of crystallization imperfect crystalline regions are formed and an abrupt increase of density is observed.

    用 DSC、动态力学方法和密度测量等手段对经不同条件热处理或拉伸的PET试样进行了研究,结果表明:DSC曲线上放热峰的位置明显地依赖于样品的结晶和取向程度。由放热峰面积算出的结晶过程的热量与试样密度无单值的依赖关系,而线性地依赖于 70℃时的力学损耗值 tanδ,后者为试样中非晶区部分多少的量度。在这一结晶阶段生成不完善的晶区并伴有密度剧增现象。

    In the present work,the results of vacuum differential thermal analyses (DTA) of ammonium and hydrazinium nitrates obtained with a Japanese Shimadzu model DT-2A instrument are reported.For observing the effect of the change of heat transfer characteristics,the DTA experiment of ammonium nitrate is performed in air.Three changes of crystal structure on the vacuum DTA curve of ammonium nitrate are shown by the endothermic peaks at 52.8,87.7 and 126.7℃ respectively.The extrapolated on-set temperature is found to...

    In the present work,the results of vacuum differential thermal analyses (DTA) of ammonium and hydrazinium nitrates obtained with a Japanese Shimadzu model DT-2A instrument are reported.For observing the effect of the change of heat transfer characteristics,the DTA experiment of ammonium nitrate is performed in air.Three changes of crystal structure on the vacuum DTA curve of ammonium nitrate are shown by the endothermic peaks at 52.8,87.7 and 126.7℃ respectively.The extrapolated on-set temperature is found to be 169.3℃ for the melting peak of the sample.The areas of these four peaks are larger than the corresponding ones in air.Its terminal endotherm on the vacuum DTA curve begins at 188℃.Under the similar conditions,there is an exotherm on the DTA curve of ammonium nitrate in air.The extrapolated on-set temperature is found to be 72.3℃ for the melting peak of hydrazinium nitrate.The terminal endotherm of the sample on the vacuum DTA curve begins at 190℃.The nitrates are evaporated partly and condensed on the cold surface of the quartz mantle during the vacuum DTA experiments.According to these facts and quantitative DTA theory,it is demonstrated that the melting peak is not masked and the exotherm does not change into the endotherm by the change of heat transfer characteristic from air to vacuum cases.According to thermochemical calculations in the present paper,it is concluded that Hodgkinson's reaction is exothermic.Accordingly,it is also concluded that the terminal endotherms on the vacuum DTA curves are the net result of the heat released during decomposition and heat absorbed upon volatilization of the liquid nitrates.Apparently,the heat of vaporization of the nitrates is the dominant factor in determining the terminal endotherms on the vacuum DTA curves.These conclusions are different from the interpretations in Breisacher's paper (1972) about vacuum DTA.

    本文报道了NH_4NO_3和N_2H_5NO_3的真空差热分析(DTA)的结果。为观察热传递特性改变的影响,在空气中做了NH_4NO_3的DTA实验。在真空实验中,硝酸盐部分地蒸发并凝聚在石英罩管的冷表面上。依据这些事实及定量DTA理论,证明从空气到真空,热传递特性的改变不掩蔽熔融峰,而放热峰也不改变为吸热峰。依据热化学计算,断定Hodgkinson反应是放热反应。因此,推断真空DTA曲线终端的吸热峰是分解放出的热量和液态硝酸盐蒸发而吸收的热量的净结果。显然,硝酸盐的蒸发热是决定真空DTA曲线终端吸热峰的支配因素。这些结论皆不同于Breisacher的解释。

     
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