Science China Technological Sciences
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New forming method of manufacturing cylindrical parts with nano/ultrafine grained structures by power spinning based on small plastic strains
Science China Technological Sciences - Tập 59 - Trang 1656-1665 - 2016
A new spinning method to manufacture the cylindrical parts with nano/ultrafine grained structures is proposed, which consists of quenching, power spinning and recrystallization annealing. The microstructural evolution during the different process stages and macroforming quality of the spun parts made of ASTM 1020 steel are investigated. The results show that the microstructures of the ferrites and...... hiện toàn bộ
Highly transparent, antifreezing and stretchable conductive organohydrogels for strain and pressure sensors
Science China Technological Sciences - Tập 64 - Trang 2532-2540 - 2021
Conductive hydrogels are good candidates for flexible wearable sensors, which have received considerable attention for use in human-machine interfaces, human motion/health monitoring, and soft robots. However, these hydrogels often freeze at low temperatures and thus, exhibit low transparency, weak mechanical strength and stretchability, as well as poor adhesion strength. In this paper, conductive...... hiện toàn bộ
A constitutive model for granular soils
Science China Technological Sciences - Tập 61 - Trang 1546-1555 - 2018
A simple constitutive model is presented to describe the mechanical behaviors of granular soils in a large stress range. A novel normal compression line (NCL) is first expressed by introducing a limit void ratio (eL) in the double logarithmic scale. Subsequently, a state parameter (ξ) is defined to quantify the current state of granular soils, and a unified hardening parameter (H) that is a functi...... hiện toàn bộ
3D simulation of image-defined complex internal features using the numerical manifold method
Science China Technological Sciences - - Trang 1-17
The numerical simulation of internal features, such as inclusions and voids, is important to analyze their impact on the performance of composite materials. However, the complex geometries of internal features and the induced continuous-discontinuous (C-D) deformation fields are challenges to their numerical simulation. In this study, a 3D approach using a simple mesh to simulate irregular interna...... hiện toàn bộ
Study on seismic response control of a single-tower self-anchored suspension bridge with elastic-plastic steel damper
Science China Technological Sciences - - 2012
Experimental investigation on propagating characteristics of sinusoidal unsteady flow in open-channel with smooth bed
Science China Technological Sciences - Tập 55 - Trang 2028-2038 - 2012
A high accuracy experimental system has been established for unsteady open-channel flow. Then 40 experiments were conducted to study the propagating characteristics of unsteady open-channel flow. From the experimental data, the variation law of propagating velocity, wave deformation rate, flow depth of wave peak and bottom, and other parameters were obtained. The experimental results show the foll...... hiện toàn bộ
Numerical simulation of rotor-airframe aerodynamic interaction based on unstructured dynamic overset grids
Science China Technological Sciences - Tập 55 - Trang 2798-2807 - 2012
A method of unstructured dynamic overset grids is developed for the numerical simulation of helicopter unsteady rotor-airframe aerodynamic interaction. For the effective treatment of the relative motion between the rotor and the airframe, the domain of flowfield is divided into two overset subzones, namely, a rotational subzone containing the blades and a stationary subzone containing the airframe...... hiện toàn bộ
A novel orientation measurement using optical sensor for spherical motor
Science China Technological Sciences - Tập 56 - Trang 1330-1339 - 2013
The measurement of spherical rotor orientation is crucial to the close-loop control of spherical motors. This paper presents a novel method for the measuring of three-degree-of-freedom (DOF) rotor orientation of spherical motors using optical sensors. The spatial orientation of spherical rotor is output in the form of ZXZ Euler angles. Firstly, the structure of the measuring system composed of opt...... hiện toàn bộ
Longitudinal distribution of O2 nightglow brightness observed by TIEMD/SABER satellite
Science China Technological Sciences - Tập 55 - Trang 1258-1263 - 2012
The global distribution of 1.27 μm O2 nightglow brightness observed by the TIMED/SABER satellite has been investigated to find the longitudinal structures for different seasons and latitudes. The results show that the O2 airglow is dominated by wave 4 structure at latitudes between equator and 20°S/N in both hemispheres during most seasons. At mid-latitudes around 40°S/N, the wave 1 structure is o...... hiện toàn bộ
Hot-exciton effects on exciton diffusion and circular polarization dynamics in a single PbI2 nanoflake
Science China Technological Sciences - - 2023
As one of the emerging two-dimensional lead halide materials, lead iodide (PbI2) nanosheets have proven to possess strong application potential in the fields of high-energy radiation detection and highly efficient perovskite solar cells. However, the underlying photophysical properties such as hot-exciton-related carrier dynamics remain unclear for PbI2 nanosheets. Here, we report the exciton dyna...... hiện toàn bộ
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