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 components
 REACTIONS BETWEEN TWO COMPONENTS OF A ZIEGLER-NATTA TYPE CATALYST, NdCl_3·3i-PrOH AND AlEt_3, AND CATALYTIC ACTIVITY OF THE REACTION PRODUCT IN THE DIENE POLYMERIZATION Ziegler-Natta型催化剂NdCl_3·3i-PrOH—AlEt_3两组分间的反应及其反应产物对双烯烃聚合的催化活性 短句来源 Catalytically Active Components of Fe_2O_3-Sb_2O_4Mixed Oxide Catalysts and Their Role in Ammoxidation of Propylene Fe_2O_3-Sb_2O_4复合氧化物催化剂的催化活性组分及其在丙烯氨氧化中的作用 短句来源 SYNTHESIS OF MANNICH BASES WITH KETONES AS ACIDIC COMPONENTS 用酮作为酸性组分的Mannich碱的合成 短句来源 THE EFFECT OF PREPARATION METHOD ON THE DISTRIBUTION AND CHEMICAL STATES OF ACTIVE COMPONENTS OF Ni-W/γ-Al_2O_3 CATALYST Ni-W/γ-Al_2O_3加氢催化剂的制备方式对活性组分分布及化学状态的影响 短句来源 A Study of GLPC Method for Determination of the Activity Coefficients of the Volatile Components in Binary System 关于测定二元系中挥发组分活度系数的GLPC方法的研究 短句来源 更多
 component
 METHOD OF DETERMINATION OF THE CRYSTALLITE SIZE DISTRIBUTION OF ACTIVE COMPONENT OF CATALYST AND ITS APPLICATIONS 催化剂活性组分晶粒大小分布的测定方法及应用 短句来源 STUDIES ON THE POLYMERIZATION OF FUNCTIONAL MONOMERS CONTAINING AMINO-GROUPS Ⅴ. THE SYNTHESIS OP 4-N, N-DIMETHYLAMINOSTYRENE AND ITS USES AS A COMPONENT OP REDOX INITIATION SYSTEM 含胺基功能性单体的聚合研究 Ⅴ.4-N,N-二甲胺基苯乙烯的合成及其作为氧化还原引发体系组分的研究 短句来源 ON THE INTERACTION BETWEEN ACTIVE COMPONENT AND SUPPORT OF IRON OXIDE/MgO CATALYST 氧化铁/MgO催化剂的载体与活性组分的相互作用 短句来源 ON THE INTERACTION BETWEEN ACTIVE COMPONENT AND SUPPORT OF IRON OXIDE/γ-Al_2O_3 CATALYST 氧化铁/γ-Al_2O_3催化剂的载体与活性组分的相互作用 短句来源 ON THE INTERACTION BETWEEN ACTIVE COMPONENT AND SUPPORT OF IRON OXIDE/TiO2 CATALYST 氧化铁/TiO_2催化剂的载体与活性组分的相互作用及三种催化剂的对比 短句来源 更多
 composition
 THE EFFECT OF SALTS OF FATTY ACIDS ON THE ACTIVITY COEFFICIENT OF NONAQUEOUS COMPONENT IN AQUEOUS SOLUTIONS WITH FIXED COMPOSITION 298.1K 298.1K时脂肪酸钠盐对定组成水溶液中非水组分活度系数的影响 短句来源 Determination of Composition in Minor Yttrium Rare Earth Mixtures by ICP-AES ICP-AES法测定低钇混合稀土组分 短句来源 DETERMINATION OF CHEMICAL COMPOSITION OF TYRES BY CAPILLARY PGC/FTIR(NICOLET) 用Nicolet-PGC/FTIR系统鉴定轮胎橡胶的化学组分 短句来源 On the Relationship Between Capacity Factors of Explosives and Composition of Mobile Phase in Reversed-Phase HPLC HPLC中火炸药组分的容量因子与流动相组成的关系 短句来源 Determination of Composition in LNA Crystals LNA晶体组分的测定 短句来源 更多
 fraction
 Determination of Components in C5 Fraction by HP-1 Capillary Gas Chromatography 碳五馏分组分的HP-1毛细管色谱法测定 短句来源 Assays of serum phosphorus fraction in fish, pelteobagrus vachelli and their applications 瓦氏黄颡鱼血清磷组分的测定及应用 短句来源 Purification and Physico - chemical Characteristics Analysis of Sweet Potato Polysaccharides Fraction SPPS - I - Fr -Ⅱ 甘薯多糖SPPS-I-Fr-Ⅱ组分的纯化及理化性质分析 短句来源 Purification and Physico-chemical Characteristics Analysis of D.fordii Prain et Burkill Fraction DFPN-Ⅰ 广东淮山多糖DFPN-Ⅰ组分的纯化及理化性质分析 短句来源 The Structural Analysis of Purified Fraction of Water Soluble Pentosan 水溶戊聚糖分级纯化组分结构初步分析 短句来源 更多

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 components
 A varietyQ??19 is explicitely constructed as the union of 22 disjoint irreducible components which are either points or open subsets of linear spaces. Semi-invariants of quivers can be constructed by taking admissible partial polarizations of the determinant of matrices containing sums of matrix components of the representation and the identity matrix as blocks. Secon, we are interested in dominant polynomial mapsF:?n→?n-1 whose connected components of their generic fibers are contractible. A fundamental question is how the irreducible components are embedded in the tensor product. We give a characterization and a combinatorial description of representations with small Cartan components. 更多
 component
 Finally the cubic surfaces of each component ofQ are studied in details by determining their stabilizers, their rational representations and whether they can be expressed as the determinant of a 3×3 matrix of linear forms. LetD be a Hermitian symmetric space of tube type,S its Shilov boundary andG the neutral component of the group of bi-holomorphic diffeomorphisms ofD. This underlying group H1(X, T \bar{X}) can be described as a generalized Prym variety, whose connected component is either an abelian variety or a degenerate abelian variety. A special component of the tensor product is the so-called Cartan component Vλ+μ which is the component with maximal highest weight. Consider a non-connected algebraic group G = G ? Γ with semisimple identity component G and a subgroup of its diagram automorphisms Γ. 更多
 composition
 We study the composition of the functor from the category of modules over the Lie algebra $\mathfrak{gl}_m$ to the category of modules over the degenerate affine Hecke algebra of GLN introduced by I. We also establish a connection between the composition of the functors, and the "centralizer construction" of the Yangian ${\rm Y}(\mathfrak{gl}_n)$ discovered by G. We also determine all the composition factors of the symmetric tensors of the natural osp(2|2n)-module. For Fourier-bandlimited symbols, we derive the expected formulae for composition and commutators and construct an orthonormal basis of common approximate eigenvectors that could be used to study spectral theory. For Fourier-bandlimited symbols, we derive the expected formulae for composition and commutators and construct an orthonormal basis of common approximate eigenvectors that could be used to study spectral theory. 更多
 fraction
 The following structure has been determined for the repeating unit: →6)-α-D-Glcp-(1→ This fraction exhibited significant macrophage activity through the release of nitric oxide In the present study, the effect of picroliv, an irridoid glycosidic fraction of Picrorhiza kurroa, on the above said parameters of these alcoholic rats was studied. It was found that the size and content of pores increased with an increase in the PU mass fraction in the PAA/PU blend up to 20%. Because of the existence of nanopores, the dielectric constant of PI films decreased by a wide margin and was less than 2.0 at a PU mass fraction of 20%. The percolation thresholds of PS/PPy and Zn-SPS/PPy composites were 6.2% and 2.7% of the volume fraction of PPy, respectively, much lower than the theoretically predicted value of 16%. 更多
其他
 A new method has been described in this paper for simplifying the anlysis of the liquid phase in salt-water equilibrium systems. According to this method,in a three component system of two salts and water, when the liquid phase is in equilibrium with a solid phase of definite composition such as a salt, or a salt hydrate,etc,only one component has to be determined by analysis,the other two can then be calculated. This is accomplished by first making a solution of water and one salt with definite ratio, and then... A new method has been described in this paper for simplifying the anlysis of the liquid phase in salt-water equilibrium systems. According to this method,in a three component system of two salts and water, when the liquid phase is in equilibrium with a solid phase of definite composition such as a salt, or a salt hydrate,etc,only one component has to be determined by analysis,the other two can then be calculated. This is accomplished by first making a solution of water and one salt with definite ratio, and then let the solid phase dissolve in it. Then the problem is reduced to a solubility problem. We have discussed the limitation of applicability and conditions of ensuring accuracy, and also the possibility of extension to systems of more components.In general,the larger the number of components,the more the simplification. This method is applied to the study of the system NaCl-NaAc-H_2O. It has been found to be particular by seutable,as the analysis of Na~+ or Ac~- ions is difficult. 本文考虑了一个简化盐水体系液相成分分析的方法。用这个方法,在二盐和水的三组分体系中,只要和液相平衡的固相是一个定组成的化合物,例如纯盐,盐的某水合物等,都只要分析液相中一个组分就可以算出另外一个组分和水的含量。所以能够如此做,是因为我们可以把三组分体系中的二个组分先用固定比例配成液体,而得与液相平衡的固定出它的溶解度就行了。本文也讨论了这样做法的限制,准确度和它是否可以推广到多元体系。一般说来,组分愈多,也就愈可简化。应用这个方法求研究NaCl-NaAc-H_2O的体系是适宜的,特别是还没有好的分析方法来定Na~+及Ac~-。在本文中,只要分析Cl~-离子。本文求出NaCl-NaAc-H_2O在20℃时的相图。 In the present paper, a comparatively simple spectrochemical method for thedetermination of rare earth elements and thorium in their mixtures is described.The method takes the advantage of combined chemical and spectrographic proce-dure. The rare earths and thorium mixture is separated chemically from the mi-nerals. The cerium oxide content is determined volumetrically and then raised to80.0% by adding pure cerium compound, according to the method proposed byFassel. A drop of the resulting chloride solution... In the present paper, a comparatively simple spectrochemical method for thedetermination of rare earth elements and thorium in their mixtures is described.The method takes the advantage of combined chemical and spectrographic proce-dure. The rare earths and thorium mixture is separated chemically from the mi-nerals. The cerium oxide content is determined volumetrically and then raised to80.0% by adding pure cerium compound, according to the method proposed byFassel. A drop of the resulting chloride solution is introduced to the flat top of agraphite electrode, which has been treated previously with a drop of liquid paraffin.The electrode is dried on a hot plate and excited in an activated A. C. arc. Spec-tral line pairs for the determination of La, Nd, Sm, Pr, Y, Gd, Dy, Yb and Erhave been selected in the region 3, 500--4, 500 A, while that of thorium falls inthe ultraviolet region. Cerium is used as internal standard. The root mean squaredeviations of a single determination vary from 2.9 to 8.8% for different elements.The linearity ef the working curves, obtained from a series of widely varyingstandard samples, and the results of rare earths and thorium for monazite showthat the present methed is free from line interference and systematic errors. Comparison has been made with regard to the vaporization characteristics ofthe rare earth oxides and thoria in the carbon D. C. are and their chlorides onthe surface of graphite electrode in the A. O. are. The effects of chlorides, nitra-tes and snlfates on the line intensity of the rare earths in the latter case havealso been observed. 本工作用化学处理与光谱分析的操作制订一较简单的分析法,适用于测定以铈组为主的希土混合物中个别组分的含量。根据Fassel的方法,希土元素及钍从矿石中用化学方法分离后,以容量法测定铈,再加入纯铈,提高氧化铈含量至80.0％。所得之混合氯化物溶液加到经液体石腊处理过的碳电极上,在电热板上干燥后,用活化交流电弧作激发光源在3,500—4,500A波段内摄谱,进行La,Nd,Sm,Pr,Y,Gd,Dy,Yb及Er的含量测定。钍在紫外摄谱。单次摄谱的均方误差在2.9—8.8％间。根据用含量变动范围较大的标准试料所作的工作曲线以及本法具体应用于独居石中希土及钍的混合物的分析结果,说明本法中没有元素互相干扰以及系统误差。此外,在工作中还比较希土元素粉末试料在直流碳电弧中及其氯化物溶液在碳电极表面上干燥后在交流电弧中的蒸发特性,并观察希土氯化物,硝酸盐及硫酸盐在后一光源中对谱线强度的影响。 Benzophenone has been found to be a suitable fixed phase for gas-liquid chromato-graphy of methylchlorosilanes.Good separation of methyhrichlorosilane,dimethyldichlorosi-lane,trimethylchlorosilane and silicon tetrachloride was obtained at 52℃. 1.二苯甲酮适用于作分离和鉴定甲基氯硅烷的固定相。2.在较低的温度下(52℃)能将甲基三氯硅烷,二甲基二氯硅烷,三甲基(?)氯硅烷和四氯化硅混合物中的各组分完全分开。 << 更多相关文摘
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