检索结果-南通市图书馆

Free vibration and transient response of double curved beams connected by intermediate straight beams

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(english edition) 2025年第1期46卷 37-62页

作者： R.A.JAFARI-TALOOKOLAeI h.ghANDVAR e.JUMAeV S.KhATIR T.CUONg-Le School of Mechanical engineering Babol Noshirvani University of Technology Department of Mechanical engineering Faculty of Engineering New Uzbekistan University University of Business and Science Center for engineering Application and Technology Solutions Ho Chi Minh City Open University

This paper investigates the free vibration and transient response of interconnected structures including double curved beams and intermediate straight beams,which are all constructed from functionally graded porous(FgP) materials. The strain potential and kinetic energies of each beam along with the work done by the external force are calculated. Additionally, a higher-order beam element is introduced to derive stiffness and mass matrices, along with the force vector. The curved and straight beams are discretized, and their assembled stiffness, mass matrices, and force vectors, are *** conditions at the joints are used to derive the total matrices of the entire structure. Subsequently, the natural frequencies and transient response of the system are determined. The accuracy of the mathematical model and the self-developed computer program is validated through the comparison of the obtained results with those of the existing literature and commercial software ANSYS, demonstrating excellent ***, a comprehensive study is conducted to investigate the effects of various parameters on the free vibration and transient response of the considered structure.

关键词：

Current status of yttrium-90 microspheres radioembolization in primary and metastatic liver cancer

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Interventional Medicine 2023年第4期6卷 152-158页

作者： Yasaman Anbari Floortje e.Veerman grace Keane Arthur J.A.T.Braat Maarten L.J.Smits Rutger C.g.Bruijnen Wenle Tan Ye Li Feng Duan marnix g.e.h.lam University Medical Center Utrecht Utrechtthe Netherlands Interventional Radiology Department Chinese PLA General HospitalBeijingChina

Liver malignancy,including primary liver cancer and metastatic liver cancer has become one of the most common causes of cancer-related death worldwide due to the high malignant degree and limited systematic treatment *** with yttrium-90(^(90)Y)-loaded microspheres is a relatively novel technology that has made significant progress in the local treatment of liver *** different steps in the extensive work-up of radioembolization for patients with an indication for treatment with^(90)Y microspheres,from patient selection to follow up,both technically and clinically,are discussed in this *** describes the application and development of^(90)Y microspheres in the treatment of liver cancer.

关键词： Yttrium-90 microspheres Primary liver cancer Metastatic liver cancer Selective internal radiation therapy Trans-arterial radioembolization

Does mesenchymal stem cell’s secretome affect spinal sensory circuits?Implication for pain therapies

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第1期20卷 181-183页

作者： Francesco Ferrini esri h.Juárez Adalberto Merighi Department of Veterinary Sciences University of TurinGrugliascoTOItaly Department of Psychiatry and Neuroscience UniversitéLavalQuébec CityQCCanada

Mesenchymal stem cells(MSCs)are multipotent adult stem cells of mesodermal origin that can be isolated from various tissues,including bone marrow,tooth pulp,adipose tissue,and umbilical *** have gained significant attention in regenerative medicine due to their ability to modulate the immune system and favor tissue *** enrich the medium in which they are cultivated with a broad range of bioactive molecules,including growth factors,cytokines,chemokines,enzymes,nucleic acids,and extracellular vesicles that collectively compose the MSC *** increasing number of pre-clinical studies suggest that delivering in vivo an MSC-conditioned medium(i.e.,the medium collected from MSC cultures after at least 3 days of exposure)exerts neuroprotective and anti-inflammatory effects in a variety of neurological conditions.

关键词： protective clinical collective

Time-dependent early-age Behaviors of Concrete under Restrained Condition

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2007年第2期22卷 350-353页

作者：马新伟 R D hooton h lam School of Materials Science and engineering Harbin Institute of Technology Department of Civil engineering University of Toronto

To investigate the early-age behaviors of concrete under a restrained condition, a set of apparatus was developed. In this way, the tensile creep and other early-age properties can be investigated in depth. By measuring the modulus of elasticity of concrete, synchronous shrinkage of concrete and steel rings and free shrinkage of concrete, the deformations of concrete ring can be quantified respectively. The experimental results show the tensile stress in concrete is time-dependent, and the stress at cracking is much lower than the tensile strength at that age; the tensile creep plays an important role in relaxing the tensile stress and postponing the cracking of concrete.

关键词： shrinkage restrained shrinkage elastic strain tensile creep time-dependent behaviors

error code analysis and selection principle of M-ary modulation in network-based control systems

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2016年第6期23卷 1372-1382页

作者：赵顺利尹逊和魏学业 h. K. lam School of electronic and Information engineering Beijing Jiaotong University Beijing 100044 China Department of Informatics King's College London London WC2R 2LS U. K

error codes induced by M-ary modulation and modulation selection in network-based control systems are *** is the first time the issue of error codes induced by M-ary modulation is addressed in control *** network-based control systems,error codes induced by noisy channel can significantly decrease the quality of *** solve this problem,the network-based control system with delay and noisy channel is firstly modeled as an asynchronous dynamic system(ADS).Secondly,conditions of packet with error codes(PeC)loss rate by using M-ary modulation are obtained based on dynamic output feedback ***,more importantly,the selection principle of M-ary modulation is proposed according to the measured signal-to-noise ratio(SNR)and conditions of PeC loss ***,system stability is analyzed and controller is designed through Lyapunov function and linear matrix inequality(LMI)scheme,and numerical simulations are made to demonstrate the effectiveness of the proposed scheme.

关键词： network-based control system asynchronous dynamic system (ADS) M-ary modulation delay error code linear matrix inequality (LMI)

Investigation of Li-ion transport in Li7P3S11 and solid-state lithium batteries

在线全文

学校读者我要写书评

暂无评论

Journal of energy Chemistry 2019年第11期28卷 1-7页

作者： Chuang Yu Swapna ganapathy ernst R.h.van eck lambert van eijck Niek de Klerk erik M.Kelder marnix Wagemaker Department of Radiation Science and Technology Delft University of TechnologyMekelweg 152629JB Delftthe Netherlands Institute for Molecules and Materials Radboud University NijmegenHeyendaalseweg 1356525 AJ Nijmegenthe Netherlands

The high Li-ion conductivity of the Li7P3S11 sulfide-based solid electrolyte makes it a promising candidate for all-solid-state lithium batteries. The Li-ion transport over electrode-electrolyte and electrolyteelectrolyte interfaces, vital for the performance of solid-state batteries, is investigated by impedance spectroscopy and solid-state NMR experiments. An all-solid-state Li-ion battery is assembled with the Li7P3S11 electrolyte, nano-Li2S cathode and Li-In foil anode, showing a relatively large initial discharge capacity of 1139.5 m Ah/g at a current density of 0.064 m A/cm^ 2 retaining 850.0 m Ah/g after 30 cycles. electrochemical impedance spectroscopy suggests that the decrease in capacity over cycling is due to the increased interfacial resistance between the electrode and the electrolyte. 1D exchange ^7Li NMR quantifies the interfacial Li-ion transport between the uncycled electrode and the electrolyte, resulting in a diffusion coefficient of 1.70(3) ×10^-14cm^2/s at 333 K and an energy barrier of 0.132 e V for the Li-ion transport between Li2S cathode and Li7P3S11 electrolyte. This indicates that the barrier for Li-ion transport over the electrode-electrolyte interface is small. however, the small diffusion coefficient for Li-ion diffusion between the Li2S and the Li7P3S11 suggests that these contact interfaces between electrode and electrolyte are relatively scarce, challenging the performance of these solid-state batteries.

关键词： Li7P3S11 Li-ion transport Spin-lattice NMR exchange NMR Solid-state battery

A high performance gas–liquid two-phase flow meter based on gamma-ray attenuation and scattering

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第11期28卷 271-279页

作者： g. h. Roshani e. Nazemi electrical engineering Department Kermanshah University of Technology Kermanshah Iran Nuclear Science and Technology Research Institute TehranIran Radiation Application Department Shahid Beheshti University Tehran Iran

The ability to precisely estimate the void fraction of multiphase flow in a pipe is very important in the petroleum industry. In this paper, an approach based on our previous works is proposed for predicting the void fraction independent of flow regime and liquid phase density changes in gas–liquid two-phase flows. Implemented technique is a combination of dual modality densitometry and multi-beam gamma-ray attenuation techniques. The detection system is comprised of a single energy fan beam,two transmission detectors, and one scattering detector. In this work, artificial neural network(ANN) was also implemented to predict the void fraction percentage independent of the flow regime and liquid phase density changes. Registered counts in three detectors and void fraction percentage were utilized as the inputs and output of ANN, respectively. By applying the proposed methodology, the void fraction was estimated with a mean relative error of less than just 1.2480%.

关键词： gamma-ray Transmission and scattering Artificial neural network Density independent Flow regime independent Void fraction

Improved Speed and Shape of Ion-Acoustic Waves in a Warm Plasma

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2013年第10期60卷 445-452页

作者： h.g.Abdelwahed e.K.el-Shewy Physics Department College of Sciences and Humanitarian Studies Salman Bin Abdulaziz University Theoretical Physics group Faculty of Science Mansoura University

The basic set of fluid equations can be reduced to the nonlinear Kortewege-de Vries(KdV)and nonlinear Schro¨dinger(NLS)*** rational solutions for the two equations has been *** exact amplitude of the nonlinear ion-acoustic solitary wave can be obtained directly without resorting to any successive approximation techniques by a direct analysis of the given field *** Sagdeev’s potential is obtained in terms of ion acoustic velocity by simply solving an algebraic *** soliton and double layer solutions are obtained as a small amplitude approximation.A comparison between the exact soliton solution and that obtained from the reductive perturbation theory are also discussed.

关键词： field equations Sagdeev potential solitons nonlinear waves shock waves nonlinear SchrSdinger(NLS) equation

higher-Order Corrections to earth's Ionosphere Shocks

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2017年第1期67卷 90-96页

作者： h.g.Abdelwahed e.K.el-Shewy Plasma Technology and Material Science Unit(PTMSU) Physics DepartmentCollege of Science and Humanitarian StudiesPrince Sattam bin Abdulaziz UniversityAlkharjKSA Theoretical Physics group Physics DepartmentFaculty of ScienceMansoura UniversityMansouraEgypt

Nonlinear shock wave structures in unmagnetized collisionless viscous plasmas composed fluid of positive(negative) ions and nonthermally electron distribution are examined. For ion shock formation, a reductive perturbation technique applied to derive Burgers equation for lowest-order potential. As the shock amplitude decreasing or enlarging,its steepness and velocity deviate from Burger equation. Burgers type equation with higher order dissipation must be obtained to avoid this deviation. Solution for the compined two equations has been derived using renormalization analysis. effects of higher-order, positive- negative mass ratio Q, electron nonthermal parameter δ and kinematic viscosities coefficient of positive(negative) ions η1 and η2 on the electrostatic shocks in earth's ionosphere are also argued.

关键词： nonthermal electrons ion shock waves Burgers equation Burger type equation renormalization method higher-order dissipation