Beijing Institute of Architectural Design (China)

A new type of prestressed space structure—pentagonal-type aluminium alloy suspen-dome with three-strut layout and large central opening is proposed, which combines the advantages of aluminium alloy mesh shell and multi-strut-type cable dome structure. It addresses the need for improvement in the economy and environmental performance of traditional suspen-domes, as well as their insufficient structural stability. The composition of the structural system is given, and based on the symmetry and periodicity conditions, the initial prestress distribution of the structure is accurately calculated by the simple calculation method, and the calculation formulae of the geometric parameters of the structural cable-struts are deduced; subsequently, the numerical model of the new type of suspen-dome structure is established by using the finite element software ANSYS 2022 R1, and the force characteristics of the structure under full-span uniform load and half-span uniform live load are investigated. Additionally, the influence of total three categories of six parameters, including structural prestress, overall shape, and support stiffness on structural mechanical properties such as member internal forces, nodal displacements, and support reaction forces is analyzed in detail, and the sensitivity of the parameters was quantitatively evaluated. The results reveal that the overall shape parameters are significant factors affecting mechanical properties. Accordingly, the values of the main design parameters such as thickness-span ratio are suggested, which provides innovative solutions and important support for the selection and design of suspen-dome structures. • A new type of prestressed space structure was proposed. • The prestress distribution and mechanical properties were investigated. • Parametric and sensitivity analysis were conducted. • The rational values were obtained.

Abstract As China enters a phase of high-quality development, urban development is transitioning from extensive expansion to refined quality enhancement. During this phase, urban renewal must adapt to the new objectives and demands of urban development in the new era. The concept of “Inside Flow”, with its environmental and social friendly characteristics, provides a universally applicable and effective means for the sustainable renewal of old communities. Drawing on the practical case study of the renewal of the eastern section of Yaojiayuan Road in Beijing, a “small-scale, gradual, and recyclable” strategy based on the concept of “Inside Flow”, is operated for the renewal of public space in old communities that aligns with spatial form development and urban operational logic. This paper aims to offer insights for the sustainable renewal of public space in old communities in the future.

ABSTRACT This project is based on the hypothesis that the combination of visual information and environmental grades—such as airflow and temperature—in a uniform, sequential space can influence psychological responses. To explore this hypothesis, we selected the Kiyotsu Gorge Tunnel as a case study. This tunnel provides a controlled spatial environment with limited external visual stimuli and includes four viewing decks that open to the outside, allowing natural light, air, and temperature variation to enter the interior. The renovation was intended to couple visual stimuli with airflow variation, under the hypothesis that this co‐variation may strengthen psychological responses. Architectural elements, including water ponds and reflective mirrors, were introduced to enhance airflow or reflection from the exterior and intensify sensory engagement. Through this combination of visual and environmental cues, the project sought to create a cohesive, immersive experience throughout the entire tunnel.

TiC provides a promising potential for high-temperature microwave absorbers due to its unique combination of thermal stability, high electrical conductivity, and robust structural integrity. C@TiC/SiO2 composites were successfully fabricated using a simple blending and cold-pressing method. The effects of C@TiC's absorbent content and temperature on the dielectric and microwave absorption properties of C@TiC/SiO2 composites were investigated. The addition of C@TiC from 10 wt.% to 30 wt.% not only endows the composites with a higher dielectric constant and dielectric loss, but also with a greater high-temperature stability in terms of dielectric and microwave absorption properties. The composite with 30 wt.%C@TiC demonstrates a strong microwave absorption capability with a minimum reflection loss (RLmin) of -55.87 dB, -48.49 dB, and -40.36 dB at room temperature, 50 °C, and 100 °C, respectively; the 50 wt.%C@TiC composite exhibits an enhanced high-temperature microwave absorption performance with an RLmin of -16.13 dB and -15.72 dB at 200 °C and 300 °C, respectively. This study demonstrates that the TiC-based absorbers present an innovative solution for high-temperature microwave absorption, providing stability, versatility, and adaptability in extreme operational environments.

With the continuous development of detection technology, single detection technologies such as radar and infrared (IR) can no longer meet the current detection needs. The design of metamaterials is gradually moving towards multispectral compatible design. In this work, a polarization converter with low IR emissivity and a checkerboard metasurface with radar-IR bi-stealth were proposed. The filling rate of indium-tin-oxide(ITO) is increased to reduce the IR emissivity without affecting the polarization conversion efficiency. In addition, based on the radar cross section (RCS) reduction theory of the checkerboard composed of polarization conversion units, a broadband RCS reduction radar-IR bi-stealth structure is designed and analyzed. A sample was fabricated and the IR and microwave characteristics of the metasurface were measured. The numerical simulation results are in good agreement with the measurement results. The results show that the polarization conversion rate (PCR) is higher than 90% in the frequency range of 7.98-12.02 GHz, and the axial ratio (AR) is between 0.5 and 2 in the frequency range of 6.92-7.56 GHz and 12.48-15.78 GHz for the proposed polarization converter. The RCS reduction of the checkerboard metasurface exceeded 10 dB in the frequency range of 7.7-11.8 GHz. Meanwhile, the IR emissivity is less than 0.3 in 8-14 µm and the structure exhibits good optical transparency. This indicates the potential application of the proposed structure in multifunctional and multispectral compatible materials.