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Modal analysis of cracked tower crane with an experimental validation
Abstract. In this paper, dynamic stiffness model of a cracked frame structure that represents a planar tower crane is established in an explicit form based on general solution of cracked 2Dbeam element vibration. The crack is modeled by a pair of equivalent springs of stiffness calculated from the crack depth. An explicit form of frequency equati...
13 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
Hệ số hấp thụ sóng điện từ trong MoS2 đơn lớp dưới ảnh hưởng của tương tác điện tử tạp chất
Abstract: In this work, we investigate the absorption of an electromagnetic wave in a MoS2 monolayer subjected to a perpendicular static magnetic field. The absorption coefficient is calculated by the perturbation theory taking account of the electron-impurity scattering. The absorption spectrum shows the appearance of cyclotron-impurity resonan...
10 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
Microfluidic chip for trapping magnetic nanoparticiles and heating in terms of biological analysis
Abstract. In this study, we reported the results of the design and the fabrication a planar coil in copper (square, a = 10 mm, 15mm high, 45 turns), these planar coils were integrated in a microfluidic chip for trapping magnetic nanoparticles and local heating applications. A small thermocouple (type K, 1 mm tip size) was put directly on top of th...
12 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
Mật độ trạng thái điện tử trong graphene hai lớp bị hydro hóa dưới ảnh hưởng của điện trường không đổi
Abstract: In this work, we investigate the electronic density of states (DOS) in hydrogenated bilayer graphene (H-BLG) subjected in a dc electric field. Four different types of hydrogenation are considered: table-like H-BLG (TLH-BLG), chair-like H-BLG (CLHBLG), reduced table-like H-BLG (rTLH-BLG) and reduced chair-like H-BLG (rCLHBLG). The exp...
10 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
Sổ tay Tóm tắt công thức giải nhanh Vật lý 12
ĐỀ THI ĐAI HỌC + CĐ CÁC NĂM - DAO ĐỘNG CƠ HỌC Câu 1. (CĐ 2007): Một vật nhỏ dđđh có biên độ A, chu kì d.động T, ở thời điểm ban đầu to = 0 vật đang ở vị trí biên. Quãng đường mà vật đi được từ thời điểm ban đầu đến thời điểm t = T/4 là A. A/2 . B. 2A . C. A/4 . D. A. Câu 2. (CĐ 2007): Khi đưa một CLĐ lên cao theo phương thẳng đứng (coi chiều dà...
96 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
KxNiy[Fe(CN)6].xH2O prussian blue analogue: A study of size effect on the structural, optical and magnetic propertiecs
Abstract. Recently, striking effects of light irradiation on the magnetic state were reported for Prussian blue (PB) analogues AxCoy[Fe(CN)6] (A = Na, K, Rb, Cs). The physical and optical properties of these compounds are dependent on the size of the particles of the measured samples. However, there have been few reports on the formation of nano...
6 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
Determination of suitable opening angle of hydraulic support legs for designing M46-130mm self-propelled artillery
Abstract: This paper determines a suitable opening angle of the hydraulic support legs of M46-130 mm self-propelled artillery. It is a combination of M46-130 mm field gun, mounted on KrAZ-255B 6x6 military truck chassis. Based on results of investigating the changes of forces and moments acting on artillery system in static condition when chang...
12 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
Supercontinuum generation in solid-core photonic crystal fiber infiltrated with water-ethanol mixture
Abstract: In this paper, we report a numerical study of the supercontinuum (SC) generation in solid-core photonic crystal fibers infiltrated with water-ethanol mixtures. A photonic crystal fiber is constructed as borosilicate glass NC21, which consists of 7 rings of air holes infiltrated with water-ethanol mixtures. We also considered numerical...
11 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0
Making polymer membranes immobilized with phosphate solubilizing bacteria to produce controlled release fertilizer in combination with microorganisms
ABSTRACT The combination of slow-release nutrients with microbial activities in a fertilizer product could increase the fertilizer’s efficiency, and limit the impact of chemical hazard of fertilizer on the environment. The aim of this research was to determine the optimal parameters for adequate size of immobilized bacterial particles, mechanic...
7 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 5 | Lượt tải: 0
Influence of sintering temperature on low-field spin-polarized tunneling magnetoresistance of La0.7Ca0.3MnO3
I. INTRODUCTION The colossal magnetoresistance (CMR) in hole doped manganese oxides widely known as manganites with formula L1−xAxMnO3, where L = La, Nd, Pr, etc and A = Ca, Ba, Sr, Pb, etc., has been intensively studied over the last decade for their application potential [1]. This CMR (intrinsic MR) is usually observed around the PM-FM transi...
11 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 2 | Lượt tải: 0