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second order     
相关语句
  二阶
     Second Order Nonlinear Hydroelastic Analysis of Floating Systems
     浮体二阶非线性水弹性力学分析方法
短句来源
     The Study of the Cauchy Problem of a Second Order Quasilinear Degenerate Parabolic Equation and the Parallelism of a Riemannian Manifold
     二阶拟线性退化抛物方程的Cauchy问题和黎曼流形平行性的研究
短句来源
     Second Order Jacobi Approximations and Jacobi Interpolation Approximations in Non-uniformly Weighted Sobolev Spaces with Their Applications
     非一致加权Sobolev空间中的二阶Jacobi逼近和Jacobi插值逼近及其应用
短句来源
     Second order Hamiltonian Systems and Elliptic Resonant Boundary Value Problems
     二阶Hamilton系统与椭圆共振边值问题
短句来源
     Design, Synthesis and Properties of Inorganic-Organic Hybrid Second Order Nonlinear Optical Materials
     无机—有机杂化二阶非线性光学材料的设计、合成与性能研究
短句来源
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  二级
     The second order rate constants of DMS oxidation by H 2O 2 rang from 2.21×10 -2  ̄4.90×10 -2 L·mol -1 ·S -1 . The oxidation reaction rate is speeded up in the presence of Hg 2+ , which is especially apparent in artificial seawater medium.
     其二级反应速率常数为2.21×10-2~4.90×10-2L·mol-1·S-1.Hg2+的存在会加快反应速率,特别在人工海水条件下十分明显。
短句来源
     The results show that the reaction is the second order kinetics at 303—318 K. The kinetic equation obtained is r=k[ZnCl_(2)/Clay-SA_(01)]~(0.8)[C_(6)H_(6)][C_(6)H_(5)CH_(2)Cl],with an apparent activation energy 88.6 kJ/mol.
     结果表明,温度在303~318 K时,本征动力学方程为r=k[ZnC l2/粘土-SA01]0.8[C6H6][C6H5CH2C l],属二级反应,表观反应活化能为88.6 kJ/mol;
短句来源
     The experiments proved that the first stage reaction-lanthanum nitrate /sodium hydroxide reaction was a second order reaction and its kinetic equation was-dcA/dt=25.5c2A.
     经实验验证,第一阶段硝酸镧/氢氧化钠盐碱反应为二级反应,动力学方程为-dcA/dt=25.5c2A。
短句来源
     DIRECTIONS OF SECOND ORDER STRUCTURE PHASE TRANSITION AT T POINT OF O_h~3-P_(m3n) GROUP
     O_h~3-P_m3n群Γ点二级结构相变的方向
短句来源
     thi reaction of the S_2O_3~(2-)+3I~-=2SO_4~(2-)+I_3~- is studied in this paper, the experimental results showed that this reaction is a second order reaction the possible reaction mechanism and its correctness are discussed
     本文研究了反应S_2O_8~(2-)+3I=2SO_4~(2-)=I_3~-,用计算机处理所得的实验数据,证明反应是二级度应。 在此基础上我们拟定了可能的反应机理,并从结构的角度分析机理的正确性。
短句来源
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  二次
     The obtained considerable second order susceptibility of C 60 χ (2) (-ω;ω,0) =0.5×10 -12 m/V(i.e. 1.3×10 -9 esu), in agreement with that obtained from the SHG measurement.
     测量得到C60LB膜的二阶非线性光学系数χ(2)(-ω;ω,0)=0.5×10-12m/V(1.3×10-9esu)。 这一结果与用光学二次产生测量C60热蒸发膜的χ(2)(-2ω;ω,ω)同一数量级。
短句来源
     Composite second order distortion (CSO) is one of the main nonlinear distortion in optical fiber CATV transmission system.
     复合二次失真 (CSO:Composite Second Order Distortion)是光纤 CATV中最主要的非线性之一 .
短句来源
     8448 Kb/s Second Order Synchronous Digital Multiplexing Equipment
     8448kb/s二次群同步复用设备
短句来源
     The existence and multiplicity of periodic solutions are obtained for a class of su-perquadratic resonance nonautonomous second order systems ü(t)+k2ω2u+▽F(t, u(t)) = 0, a. e. t ∈ [0,T] by Z2 version of the Mountain Pass Theorem on the condition that is unbounded.
     利用Z2型山路定理,获得关于形如ü(t)+k2ω2u+▽F(t,u(t))=0(a.e.t∈[0,T])的超二次共振非自治二阶系统,当无界时,多重周期解存在性的定理.
短句来源
     SECOND ORDER ALGEBRAIC CURVE SOLUTION OF RICCATI EQUATION
     Riccati方程的二次代数曲线解
短句来源
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  第二级
     There are three-order bifurcations and four outlets into the sea in the Changjiang Estuary, and the North Channel is the northern one of the second order bifurcations, it is one of the main channels into the sea.
     长江河口三级分汊,四口入海,其中北港是第二级分汊的北汊,是长江入海的主要通道之一。
短句来源
     The North Channel is the north distributary of the second order bifurcation and one of the Changjiang Estuary's main channels into the sea.
     北港水道是长江河口第二级分汊的北汊,长江的主要入海通道之一。
短句来源
     There are three-order bifurcations and four outlets into the sea in the Yangtze Estuary, and the North Channel is one of the second order bifurcations, it is one of the main channels into the sea.
     长江河口三级分汊,四口入海,北港是第二级分汊的北汊道,是长江入海的主要通道之一。
短句来源
     The programs of drawing relation curve of diffraction intensity and angle of reflection are introduced in Turbo C. In the experiment of Bragg 's diffraction of microwave, according to theoretic value the maximum of first order of diffraction appears near α 66°,and the maximum of second order of diffraction appears near α 37°. Two maximums and the correspounding angles of reflection are demonstrated automatically in the program.
     介绍用TurboC编程序,在《微波布拉格衍射》实验中,绘制衍射强度I与入射角α的关系曲线,按理论值,第一级衍射极大值在α66°附近,第二级衍射极大值在α37°附近.程序中能自动标示出这二个极大值的数值及其所在的角度.
短句来源
     In the proposed approach, MDC is applied to the base layer of the first order SC, and then the derived descriptions are encoded by second order SCs.
     在该方案中,首先用多描述编码方法处理第一级可分级编码的基层信息,然后对得到的多描述进行第二级可分级编码。
短句来源

 

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      second order
    Behavior near the boundary of positive solutions of second order parabolic equations
          
    We state a localization principle for expansions in eigenfunctions of a self-adjoint second order elliptic operator and we prove an equiconvergence result between eigenfunction expansions and trigonometric expansions.
          
    We also obtain a way of constructing an arbitrary number of non-Gaussian continuous time processes whose second order properties are the same as those of fractional Brownian motion.
          
    The line search functions used are Han's nondifferentiable penalty functions with a second order penalty term.
          
    Finally, we prove the global convergence and the local second order convergence of the algorithm.
          
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    The reaction of quinoline-methyl iodide in salicylic aldehyde has been studied by conducto-metric method,The second order velocity constants of the reaction have been found asfollows:4. 37×10~(-3) liter per mole per minute at 25℃ 9. 57×10~(-3) at 35℃,and 19. 8×10~(-3)at 45℃ respectively.The value of the activation energy of the reaction has been determined tobe 14,200 cal.per mole,and that of the entropy of activation,-32. 0 cal.per mole per degreeat 45℃.

    喹啉-碘甲烷在水杨醛中的反应为二级反应。它的反应速度常数 k25°时为4. 37×10~(-3) ,35°时为9. 57×10~(-3) 及45°时为19. 8×10~(-3) 升/克分子·分。反应的活化能为14,200卡/克分子。45°时的活化熵为-32. 0卡/克分子·度。

    The wave eguation for the motion of an electron in the static field of lithium atom is solved by numerical method for electron energy up to 340 volts. The wave functions found in this papor are required in the calculation of collision probabilities. The zero, first and second order phases of the wave functions are plotted against the k values for the incident electrons, the distortions are much greater in the field of the lithium atom than in the field of helium atom. The first and second order phases,...

    The wave eguation for the motion of an electron in the static field of lithium atom is solved by numerical method for electron energy up to 340 volts. The wave functions found in this papor are required in the calculation of collision probabilities. The zero, first and second order phases of the wave functions are plotted against the k values for the incident electrons, the distortions are much greater in the field of the lithium atom than in the field of helium atom. The first and second order phases, which were practically negligible in the field of helium atom, are much greater in the field of lithium atom, and are comparable with the zero order phases at the higher velocities.

    本文用数字计算法算出了电子在正常态锂原子场中运动的畸变波函数,电子的投射能量由零算到340伏特.同时也算出了电子波的前三次调和项的位相移动一速度曲线.

    In order to investigate the effect of operating variabls on the yield of aromatics,a certain fraction of a straight run gasoline containing 48.4% (wt.)naphthenes was catalytically converted into aromatics over a bed of 100 ml 14—20 mesh,granular,platforming catalyst under various opera- ting conditions.The ranges of these investigations were:temperature 430— 510℃,pressure 20—50 atm.,WHSV 1.58—6.32 and hydrogen-oil molar ratio 4:1—10:1.The single pass fresh hydrogen process was adopted. The result of data...

    In order to investigate the effect of operating variabls on the yield of aromatics,a certain fraction of a straight run gasoline containing 48.4% (wt.)naphthenes was catalytically converted into aromatics over a bed of 100 ml 14—20 mesh,granular,platforming catalyst under various opera- ting conditions.The ranges of these investigations were:temperature 430— 510℃,pressure 20—50 atm.,WHSV 1.58—6.32 and hydrogen-oil molar ratio 4:1—10:1.The single pass fresh hydrogen process was adopted. The result of data treatment implied that the following second-order reaction rate expression correlates the aromatics production rate r with the operating variables satisfactorily. r=r_0(1-bx)~2, where x=aromatics yield based on feed(wt.%),and r_0 and b are constants. Superfacially r_0 may be regarded as the reaction rate constant,whereas b as a stochiometric coefficient of the equivalent kinetic equation.Both are functions of the operating temperature,pressure and hydrogen-oil molar ratio. For 4:1 hydrogen-oil molar ratio,which seems to be one of the most promising operating conditions,the differential and integral forms of the rate equation for aromatics yield are as follows: The apparent activation energy of the aromatics yield reaction by platforming under the conditions investigated,therefore,equals to 33,500 cal/gm-mol.The values of b at isobaric conditions may be correlated as: In b_(50)=8200/RT-17.5/R The significance of b is discussed thermodynamically. Considerable variations,though not large,in aromatic yield were observed when the hydrogen-oil molar ratio changed from 4:1 to 10:1.For example,at 30 atm.,490℃,this effect may be expressed by r=(p/186p+144)×10~5(1-bx)~2, where p=partial pressure of the feed stock,atm. Besides,the relative initial rates of C_8 aromatics,toluene and benzene formation were found to be in the increasing order of their molecular weights.Thus under certain operating conditions the initial rate of C~8 aromatics formation was 2.5 times that of the toluene initial formation rate,and 20 times that of the benzene formation rate.

    用直馏汽油的某一馏分在装有100毫升14—20筛眼颗粒形铂重整催化剂的反应设备中,进行单程纯氢操作的铂重整反应条件试验以考察芳烃的生成与反应条件变化的关系.试验的反应条件为:溫度430—510°压力20—50大气压,空间流速1.58—6.32重量/重量/小时,氢油分子比4:1—10:1.处理所获试验数据的结果,发现芳烃生成速度γ可用下列二次反应式来关连:

     
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