Dalian University of Technology

Jianbo Li

Zhiyuan Li

Jun Liu

Tingju Li

Enyu Guo

Zhiqiang Cao

Jinchuan Jie

Huijun Kang

Yiping Lu

Tongmin Wang

Zongning Chen

Yubo Zhang

Weihong Liu

Gao Lin

Kai Yang

Shiyun Xiao

Runyu Mei

Zhiqiang Hu

Lei Zhou

A CaTiO-based oxide thermoelectric material and a preparation method thereof are disclosed. The CaTiO-based oxide thermoelectric material has a chemical formula of CaLaTiO, where 0<x≤0.4. The present disclosure makes it possible to prepare a CaTiO-based thermoelectric material with properties comparable to n-type ZnO, CaTiO, SrTiOand other oxide thermoelectric materials. Among them, the La15 sample has a power factor reaching up to 8.2 μWcmK(at about 1000 K), and a power factor reaching up to 9.2 μWcmKat room temperature (about 300 K); and a conductivity reaching up to 2015 Scm(at 300 K). The CaTiO-based oxide thermoelectric material exhibits the best thermoelectric performance among calcium titanate ceramics. The method for preparing the CaTiO-based oxide thermoelectric material of the present disclosure is simple in process, convenient in operation, low in cost, and makes it possible to prepare a CaTiO-based ceramic sheet with high thermoelectric performance.

CaTiO-based oxide thermoelectric material and preparation method thereof

An apparatus and method for measuring a structural angular acceleration based on dynamic centrifugal force measurement belong to the technical field of angular acceleration measurement. The apparatus has a solid ball. The solid ball can move freely along the radial direction of the outer wall packaging hood. The elastic block is used as a stress base. A rod for lateral limit and connection is used for connecting the rigid block and a pulley and limiting the displacement of solid ball so that the solid ball can only move longitudinally along the apparatus. The rigid block can move freely due to the pulley. Measurement of a transient angular acceleration is converted into dynamic measurement of the centrifugal force of the solid ball. Through the above design, the dynamic angular acceleration of the structure caused by dynamic load can be relatively accurately calculated.

Apparatus and method for measuring structural angular acceleration based on dynamic centrifugal force measurement

A measuring device and method for horizontal dynamic impedance of specified foundation depth based on differential response analysis of pulse excitation. The measuring method is realized based on the measuring device. Two rigid piles with different lengths are embedded into different foundation depths. Motion characteristics of the two rigid piles in the process of collision impact with the outside are different under the same pulse excitation. Dynamic impedance of specified foundation depth is deduced from the formula according to the differential response. Single-degree-of-freedom oscillators are arranged on the pile heads of the two piles, and strain gauges are arranged on the bottoms of the single-degree-of-freedom oscillators to obtain stress states of the single-degree-of-freedom oscillators, thereby calculating the relative displacements of the single-degree-of-freedom oscillators. This is simple in structure, reliable in measurement and convenient in data collection and processing.

Measuring device and method for horizontal dynamic impedance of specified foundation depth based on differential response analysis of pulse excitation

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Dalian, China

Jianbo Li