• Hướng dẫn làm bài tập về Trọng tâm vật rắn phức hợp (Không dùng tích phân)Hướng dẫn làm bài tập về Trọng tâm vật rắn phức hợp (Không dùng tích phân)

    Sử dụng tính đối xứng Nếu mặt cắt có 2 trục đối xứng thì trọng tâm C của mặt cắt ấy là giao điểm của 2 trục đối xứng trên. CSử dụng tính đối xứng Nếu với bất cứ 1 điểm A nào trên mặt cắt đều tồn tại 1 điểm A’ đối xứng với nó qua 1 điểm C duy nhất thì C chính là tâm đối xứng của mặt cắt ấy. Tâm đối xứng của 1 mặt cắt chính là trọng tâm của ...

    pdf41 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 520 | Lượt tải: 0

  • Admissible inertial manifolds for abstract nonautonomous thermoelastic plate systemsAdmissible inertial manifolds for abstract nonautonomous thermoelastic plate systems

    1. Introduction One of effective approaches to the study of long - time behavior of infinite dimensional dynamical systems is based on the concept of inertial manifolds which was introduced by C. Foias, G. Sell and R. Temam (see [4] and the references therein). These inertial manifolds are finite dimensional Lipschitz ones, attract trajectories...

    pdf14 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 496 | Lượt tải: 0

  • Fréchet subdifferentials of the minimum time function at points in the targetFréchet subdifferentials of the minimum time function at points in the target

    If there is no trajectory of F starting at x can reach K , then. If x K  then we set T x ( ) 0  . It is well-known that, under assumptions (F1) - (F3), the infimum in (1.2) is attained and the minimum time function T is lower semicontinuous [21]. The minimum time function is an important optimal value function of optimal control theory. This ...

    pdf9 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 440 | Lượt tải: 0

  • Solation and mass production of TrichodermaSolation and mass production of Trichoderma

    Abstract: Three Trichoderma isolates (THDU-1, THDU-2, and THDU-3) were isolated from the root zone area of healthy bananas on the farm in Ba Thuoc district, Thanh Hoa province. All of these isolates showed high inhibitory activity against soil borne diseases Rhizoctonia solani and Sclerotium rolfsii. Our study proposed a protocol of Trichoderma ...

    pdf5 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 359 | Lượt tải: 0

  • A trial of Neolamarckia cadamba in Thanh Hoa provinceA trial of Neolamarckia cadamba in Thanh Hoa province

    Abstract: A trial of Neolamarckia cadamba in Thanh Hoa province has the following results: Neolamarckia cadamba is the easy growing and photophillic tree, highly adaptable to natural conditions of Thuong Xuan, Nhu Thanh, and Tinh Gia which are representatives of the mountainous area, midland area and delta coastal area, respectively, in Thanh Ho...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 359 | Lượt tải: 0

  • Critical behavior in La0.7Sr0.3Mn0.98Cu0.02O3 compoundCritical behavior in La0.7Sr0.3Mn0.98Cu0.02O3 compound

    1. Introduction The perovskite manganites (La,Sr)MnB'O3, where B‟ stands for the transition elements have recently attracted a wide range of research in laboratories because of their potential applications in electric devices that operate based on colossal magnetoresistance effect (CMR) and magnetocaloric effect (MCE) [1-4]. Basically, the magnetic...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 360 | Lượt tải: 0

  • Exponential stability of 2D discrete systems with mixed time-varying delaysExponential stability of 2D discrete systems with mixed time-varying delays

    1. Introduction Two-dimensional systems have many applications in different arears as geographical data processing, electrical circuit networks, power systems, energy exchange processes, multibody mechanics, process control, aerospace engineering and physical processes [18, 4, 9, 14]. In recent years, 2-D switched systems have attracted the att...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 367 | Lượt tải: 0

  • Exponential stability for singular systems with interval time-varying delaysExponential stability for singular systems with interval time-varying delays

    1. Introduction Singular systems have many applications in reality such as electrical circuit network, power systems, aerospace engineering, network control, economic systems [6,19]. Therefore, these systems have been extensively studied over the past few decades and have yielded significant results. Using Lyapunov‟s approach to reach out to sc...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 408 | Lượt tải: 0

  • Long-time behavior of solutions to a quasilinear parabolic equationLong-time behavior of solutions to a quasilinear parabolic equation

    Abstract: In this paper, we study the first initial boundary value problem for a class of quasilinear degenerate parabolic equations involving weighted p-Laplacian operators. The existence and uniqueness of a weak solution with respect to initial values is ensured by an application of the Faedo - Galerkin approximation and compact method. Moreov...

    pdf15 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 392 | Lượt tải: 0

  • Non-Autonomous stochastic evolution equations, inertial manifolds and chafee-infante modelsNon-Autonomous stochastic evolution equations, inertial manifolds and chafee-infante models

    Abstract: Consider a stochastic evolution equation containing Stratonovich-multiplicative white noise of the form     where the partial differential operator A is positive definite, self-adjoint with a discrete spectrum; and the nonlinear part f satisfies the  -Lipschitz condition with  belonging to an admissible function space. We prove...

    pdf16 trang | Chia sẻ: thanhle95 | Ngày: 09/07/2021 | Lượt xem: 334 | Lượt tải: 0