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61.
A semi-analytical and semi-numerical method is proposed for the dynamic analysis of foundations. The Lamb's solution and the approximate formulae were used to establish the relation of the contact force and deflection between the foundation and soil. Therefore, the foundation can be separated from soil and analyzed by FEM as for the static cases. The plate can be treated as that the known forces are acting on the upper surface, and the contact pressure from soil can be represented as the deflection. So that only the plate needs to be divided into elements in the analysis. By this method, a series of vibration problems, including various shapes and rigidities of foundations, different excitation frequencies, were analyzed. Furthermore, it can be used for the embedded foundation. The numerical examples show that this method has simplicity, highly accurate and versatile. It is an effective method for the dynamic analysis of foundations. 相似文献
62.
IntroductionConsiderthefollowingdelaydifferenceequationxn 1=xn(a bxn)xn- 1, n=0 ,1 ,2 ,… ,(1 )wherea ,b∈ [0 ,∞ )witha b>0 (2 )andwheretheinitialvaluesx- 1andx0 arearbitrarypositivenumbers.Eq .(1 )isregardedasageneralizedLynessequationbyG .Ladasin [1 ] .Obviously ,undercondition (2 ) ,… 相似文献
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Zhi Chen Ming Fang Peng Ren Xiu‐Hua Li Bin Zhao Dr. Associate Prof. Shi Wei Peng Cheng 《无机化学与普通化学杂志》2008,634(2):382-386
Two novel lanthanide‐based coordination polymers with 2D lattice‐type motif, [Ln2(CAM)3(H2O)4]·2H2O (CAM = 4‐Hydroxypyridine‐2,6‐dicarboxylate; Ln = Tb( 1 ), Pr( 2 )), have been prepared by hydrothermal reaction of Ln(OH)3, CAM and water at 160 °C and characterized by single‐crystal X‐ray diffraction analysis, IR and TGA. The investigation of luminescent property reveals that 1 exhibits characteristic green emission of Tb3+ ions. 相似文献
65.
Montanet L Gieselmann K Technical Associate Barnett RM Groom DE Trippe TG Wohl CG Armstrong B Technical Associate Wagman GS Technical Associate Murayama H Stone J Hernandez JJ Porter FC Morrison RJ Manohar A Aguilar-Benitez M Caso C Lantero P Technical Associate Crawford RL Roos M Törnqvist NA Hayes KG Höhler G Kawabata S Manley DM Olive K Shrock RE Eidelman S Schindler RH Gurtu A Hikasa K Conforto G Workman RL Grab C 《Physical review D: Particles and fields》1994,50(3):1173-1826
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Afundamentalcharacteristicofplasmasistheir,abilitytosmearoutelectricfields.ThisisatypicalnonlinearproblemofsolvingthePoissonequation.Thepreviousstudyofthenonlinearproblemisusuallybasedonalinearizedmethodwhenthepotentialenergyoftheparticlesismuchsmalle… 相似文献
69.
Wu Yuliang Associate Professor 《应用数学和力学(英文版)》2000,21(4):433-436
The adjoint system integrals for time free, optimal N-impulse transfer during a firing period in 5-phase selected are derived.
Biography: Wu Yuliang (1944-) 相似文献
70.
is one of the applications of (Ⅰ), in which the angular stiffness, the lateral stiffness and the corresponding stress distributions of Omega-shaped bellows were calculated, and the present results were compared with those of the other theories and experiments. It is shown that the non-homogeneous solution of (Ⅰ) can solve the pure bending problem of the bellows by itself, and be more effective than by the theory of slender ring shells; but if a lateral slide of the bellows support exists the non-homogeneous solution will no longer entirely satisfy the boundary conditions of the problem, in this case the homogeneous solution of (Ⅰ) should be included, that is to say, the full solution of (Ⅰ) can meet all the requirements. 相似文献