This paper proposes a novel parameterized frequency‐domain modal parameter identification method, called direct variational mode decomposition (DMVMD), based on the multivariate (MVMD) framework and principle of superposition. Under constraint normalized shapes, this theoretically derives relationship between natural frequencies shapes structural systems. The aim is to extract K response modes their corresponding from excited C‐dimensional vibration signals measured component’s response....

With the introduction of modern rammed earth technique, a large number buildings were constructed in China Mainland. has vast territory, which faces Circum-Pacific seismic belt on east and Eurasian south; earthquake constantly threatened safety people’s lives property. Consequently, it is necessary to probe performance buildings. Two un-stabilized specimens, one reinforced with geogrid sheets’ four stabilized specimens built for obtaining better insight behavior earth/stabilized walls under...

Top stemming is necessary to stop the explosive energy from escaping through upper part of blast‐holes in cutting blasts large‐diameter deep‐hole blasting underground mines. The often‐used single soil frequently leads material clogging which results reduction efficiency. In this paper, a new water‐soil composite proposed solve problem. A series small‐scale tests were conducted on solid concrete masonry blocks investigate effect top and length performance. experimental indicated that water...

To design a reasonable packing material, solve the problem of solid pollution brought by iron ore mining, alleviate lot backfilling affect national economic development and current situation environmental governance. Backfilling materials in this paper, we study different water-cement ratio pack slump uniaxial compressive strength discusses workability on filling body influence strength. The experimental results show that with increase water cement ratio, body's is better lower. When 0.4,...

Rock dynamic mechanical characteristic is the basic information to study damage of rock structures under loads induced from earthquake or blasting.A nuclear power plant site a granite mountain same active tectonic period.Dynamic triaxial compression experiments need be conducted on drill cores different project parts according design requirements.These were formed in period, but as result buried depth outcrop, weathering degree various.According physical and mechanics parameters longitudinal...

Objective To investigate the effects of a novel scientific research practice model on medical undergraduates' cognition and behavior. Method Totally, 60 undergraduates took part in research. All them accepted training by using improved tutorial system + team-based learning (TBL) combat models. Before after training, students completed same questionnaires respectively. The content included purpose participating activities, interest research, confidence satisfaction publishing papers,...

A twisted multifilamentary structure is needed for Nb3Sn and NbTi strands to be used in the International Thermonuclear Experimental Reactor (ITER) magnets. As important parameters superconducting design production, twist pitch length direction of must meet requirements according ITER Procurement Arrangement (PA) this verified. The technical are 15mm+/-2mm right hand direction. strand can measured on straight sections strand, which recognized by repetition filament bundles or angle...

With the increasing drilling depth, problems follow, such as lifting height of liquid in well and increased pump operation. Therefore, improving production efficiency deep wells is a hot spot current oil industry. This paper designs new jet that can be mined for high low-pressure layers according to wells' inter-layer contradiction. The FLUENT software used simulate pump, analyze factors physical properties fluid, BP neural network optimize structure pump. results show maximum spout...

Fault fracture zone with rich water has some bad geological conditions such as low strength, deformation, strong permeability, poor resistance. This paper is based on Yan-jia Tunnel in HuBei-Guzhu Highway. WSS taken the advanced support method and improved construction condition. of meshshotcreting firstly adopted. The result numerical simulation ABAQUS basically consistent field measurements, which significance subsequent design underground projects similar conditions.