Beijing University of Civil Engineering and Architecture

A novel medical image segmentation network for colorectal polyp small targets and fuzzy boundaries

OBJECTIVES: To address the challenges of complex feature variations and unclear boundary definitions between segmented targets and surrounding regions in medical images, a novel segmentation model based on Deformable Large Kernel Convolutional Attention (D-LKA) and Transformer is...

Never off the clock: how after-hours electronic communication affect boundary-spanning behaviors in construction projects

Purpose The purpose of this study is to examine the effect of leader after-hours electronic communication on employees' boundary-spanning behaviors in construction projects, while exploring the mediating role of perception of workplace objectification and the moderating role of p...

Numerical modeling for generating ultrahigh porosity aluminum foam through independent control of pore size and cell wall thickness

This paper proposed a numerical modeling method for generating ultrahigh porosity aluminum foam through independent control of pore size and cell wall thickness. The proposed method introduced two independently adjustable parameters (point spacing and scaling distance) to control...

Influence of Composite Mineral Admixtures and Expansive Agent on the Mechanical Properties, Durability and Microstructure of Cementitious Materials

To improve volume stability and durability of cementitious materials, a composite mineral admixture including ground granulated blast furnace slag, fly ash and silica fume was incorporated at a fixed 12% replacement ratio together with varying dosages of an expansive agent (EA)....

The Efficiency and Mechanisms of Granular Activated Carbon for the Removal of Nitrosodimethylamine and Its Precursors in Reclaimed Water

Abstract During the potable reuse of reclaimed water, nitrosodimethylamine (NDMA), as a highly carcinogenic disinfection by-product (DBP), requires critical control. In this study, copper-doped nano zero-valent iron supported on granular activated carbon (nZVI-Cu@GAC) was synthes...

Ultra-low frequency Vibration Isolation Based on a Symmetric-Converging Series Horizontal-Spring Quasi-Zero-Stiffness Mechanism

Low-frequency vibrations, especially those in the ultra-low frequency range below 1 Hz, are difficult to suppress due to their long wavelengths, slow attenuation, and strong penetration. To address this challenge, a novel quasi-zero-stiffness (QZS) isolation mechanism is proposed...

Benchmarking and assessment of image-based methods for particulate matter estimation: The AQpictures project

Abstract. Fine particulate matter (PM2.5) is a major air-quality and public-health concern, while conventional monitoring networks remain limited in coverage and costly to deploy and maintain. This work presents the AQpictures project, which investigates alternative low-cost moni...

A Dual-Cuboid Constraint Method with Marching Cubes-Based Contour Extraction for Verticality Inspection of Square Tower Structures

Verticality inspection of square tower structures is of great significance for ensuring structural operational safety, extending service life, and optimizing maintenance strategies. However, conventional verticality inspection methods still exhibit deficiencies in point cloud noi...

Automatic Line Drawing Generation for Grotto Wall Surfaces Based on Depth Map and Normal Map Fusion

Abstract. To address the lack of suitable methods for automatic 2D line drawing generation from grotto wall mesh models, as well as the difficulty of existing methods in balancing structural representation and detail preservation, this paper proposes a line drawing generation met...

Research on Hyperspectral-Based Feature Set Construction and Machine Learning Inversion for Mixed Salts Characteristics in Murals

Abstract. To enable non-destructive quantitative identification of mixed salts in mural plaster layers, hyperspectral data were collected from Na₂SO₄-CaCl₂ mixed-salt samples. Based on these data, a method integrating spectral preprocessing, feature-set construction, and machine-...

A study on the dual-modular system of the central palace in Wudang Mountain’s Yuzhen Palace

Ancient Chinese architectural complexes employed hierarchical modular systems, yet the relationship between planning-scale and construction-scale modules remains insufficiently understood. This study investigates the Central Palace of Yuzhen Palace on Mount Wudang using archaeolo...