Publications

The behavior of sheeting connections is important in thin-walled structures, especially when diaphragm skin action is considered for these structures. This paper presents an experimental study on the monotonic and cyclic loading behavior of self-drilling screw connections in stainless steel frame shear walls sheathed with ply-bamboo panels. A total of 46 screwed connection specimens were tested to determine the effects of loading rate, end distance of screws and screw features. The results observed in this study have presented the failure modes and the effects of different factors. It is shown that, the shear behavior of screw connections is little affected by loading rate; both strength and deformation increase with the end distance increasing in the tested range; the shear behavior of phosphating self-drilling screws is superior to stainless steel self-drilling screws.

Potting Shuijing grapes were used as materials. The effects of colchicines treatment at different time and concentrations were studied on polyploid induction. The treated parts of the plants were shrouded by absorbent cotton to ensure the optimal treating time and concentration. Comparisons of configurations,physiology and biochemistry,anatomy,cytology identification were done between the variant plants and contrast plants. The results showed that the best induction rate was achieved at 8 mg /mL of colchicines treatment for5 days. The treated plants showed the great possibility of polyploid and obviously stronger indications than water treatment plants in the distance between nodes,leaf thickness,SOD enzyme activity,stomatal density and size,tube diameter and length,and cell size.

A new type of hybrid wood-bamboo shear wall was studied. Ply-bamboo is used as the sheathing panel for conventional two-by-four lightweight woodframe shear walls herein. Two different nails were adopted for the ease constructability and used for constructing the shear walls, as follows: gun-driven T shape nail and 6d common nail. Monotonic and cyclic test results of sheathing-frame connectors and corresponding full scare shear walls were also reported. The results obtained from the research reported in this paper indicated that ply-bamboo panels can be used as sheathings for light-weight timber shear walls.

The off-axis embedment behaviors of unidirectional and multidirectional laminated engineered bamboo panels used for glued-laminated bamboo (glubam) structures under dowel-type bolts with three different diameters, 12, 14, and 16 mm, were experimentally studied in this research. The half-hole loading method given by current standards was adopted to perform the embedment tests. Seven different off-axis loading directions from 0° to 90° related to the main bamboo fiber direction at an interval of 15° in the panel plane were considered. The different failure patterns, stress-displacement curves, and the corresponding full-field surface strain measured through the digital image correlation (DIC) method are reported. The loading angles significantly influenced the embedment performance of unidirectional bamboo panel specimens, and the strength values decreased with the increasing off-axis loading angles. A difference of 35% in the strength values between 0° and 90° loading specimens was observed. However, quasi-isotropic embedment properties were noticed for the multidirectional laminated engineered bamboo panels. The capacity functions were provided to predict the mean off-axis embedment strength and characteristic strength values by inputting the characteristic density values into the functions. Compared with the characteristic strength values estimated through the statistical method, with a 95% probability of exceedance and 75% significant level, the conventional capacity-function method underestimated the off-axis embedment strength values, and thus may leading to an overconservative design. The statistical characteristic embedment strength values are suggested to be used to calibrate the safety factor of capacity equations given by wood standards. Results from this research can be used to predict the ultimate strength of glubam joints under complex loading conditions and obtain reliable design values for engineering applications.

Vision-based 3D occupancy prediction has become a popular research task due to its versatility and affordability. Nowadays, conventional methods usually project the image-based vision features to 3D space and learn the geometric information through the attention mechanism, enabling the 3D semantic occupancy prediction. However, these works usually face two main challenges: 1) Limited geometric information. Due to the lack of geometric information in the image itself, it is challenging to directly predict 3D space information, especially in large-scale outdoor scenes. 2) Local restricted interaction. Due to the quadratic complexity of the attention mechanism, they often use modified local attention to fuse features, resulting in a restricted fusion. To address these problems, in this paper, we propose a language-assisted 3D semantic occupancy prediction network, named LOMA. In the proposed vision-language framework, we first introduce a VL-aware Scene Generator (VSG) module to generate the 3D language feature of the scene. By leveraging the vision-language model, this module provides implicit geometric knowledge and explicit semantic information from the language. Furthermore, we present a Tri-plane Fusion Mamba (TFM) block to efficiently fuse the 3D language feature and 3D vision feature. The proposed module not only fuses the two features with global modeling but also avoids too much computation costs. Experiments on the SemanticKITTI and SSCBench-KITTI360 datasets show that our algorithm achieves new state-of-the-art performances in both geometric and semantic completion tasks. Our code will be open soon.

In order to explore the genetic relationship between hybrid progenies of alfalfa cultivated species,involving Gannong 3#,Gannong 5#,Tourists and their parents,the genetic diversity was analyzed the by ISSR marker and 4primers were screened to detect the genetic diversity of tested materials.The results showed that 4primers with high polymorphism were screened and 122sites were generated,which were all polymorphic sites.22informative ISSR markers were generated and showed a polymorphic band ratio of 95.45%.The genetic diversity of tested materials was rich.Genetic distances between hybrid progenies and three parents were analyzed,genetic distance between fast-growing 16# and the three parents was the smallest(0.327),while it between big leaf 1#and the three parents was the biggest(0.752).Clustering results showed that 39materials were clustered into 5categories,there were 14strains in Categories A,including 14fast-growing 1#,fast-growing 6#and so on;5strains in Categories B,including fast-growing 2#,fast-growing 3# and so on;13strains in Categories C,including fast-growing 4#,fast-growing 11# and so on;4strains in Categories D,including fastgrowing 17#,fast-growing 26# and so on;fast-growing 18# was clustered in one category.

Glued laminated bamboo (glubam) products are high strength but brittle; therefore, ductile joints are inevitably required for the application of glubam structures. In this research, a novel slotted glubam-steel-glubam pin joint with expanded tubes was investigated. The GSG joints were subjected to monotonic and cyclic loading. The test results indicated that the brittle fracture failure patterns, such as splitting and row shear failure, of glubam joints could be effectively avoided by using steel tubes of appropriate thickness and multidirectional laminated bamboo panels. Three different methods were compared to determine the yield strength of the connections for design applications and the Farthest Point Method (FPM) appeared to be the most suitable for the glubam structures. The estimates based on the yield model and fracture mechanics to give the yield strength and fracture resistance of the joints are also discussed. The prevention of premature brittle failure of glubam connections can be achieved by allowing the fracture resistance of the bamboo members to be appropriately greater than the yield strength of the steel tubes. This research has demonstrated that this GSG steel tube pin joint has well-balanced strength and ductility performance, and thus has promising potential for use in seismic regions.

Rapidly increasing household energy consumption poses significant challenges to global warming mitigation and the transition to low-carbon economies, particularly in China. This paper addresses this issue by introducing a comprehensive segmentation model which effectively subdivides household energy usage into five end-uses: cooking/hot water, heating, cooling, lighting, and power. The segmentation model uncovers compelling insights into urban end-use energy consumption patterns across China and variations among provinces. We observe a consistent increase in urban household end-use energy consumption and per capita energy consumption levels over the past decade. Heating and cooking/hot water emerge as the dominant contributors to household energy consumption, accounting for 26% and 40% of the total, respectively. Furthermore, it is found that higher levels of urbanization and improved living conditions are positively correlated with increased power energy consumption. The declining number of household members, primarily due to the prevalence of nuclear families, has resulted in higher energy end-use, particularly in both developed and underdeveloped economic areas. This paper serves as a valuable foundation for understanding and quantifying household end-use energy consumption. The findings contribute to a more comprehensive understanding of energy consumption patterns, facilitating a cleaner and more sustainable transformation of energy consumption structures.

As building energy demand and carbon emissions increase, Building Integrated Photovoltaics (BIPV) offers a critical pathway for public buildings to cut reliance on traditional energy sources. Although BIPV provides renewable power, its role in enhancing indoor thermal performance during winter in cold regions remains insufficiently explored. This study proposes the combination of BIPV and double skin facade (DSF) to form a building-integrated photovoltaic-double skin facade system (BIPV-DSF), which can not only provide electricity but also enhance temperature regulation and reduce the loads of the building. Through the simulation of ventilation and air temperature in the ventilation channels (VC) and indoor space, this study demonstrates that: (1) BIPV-DSF increases VC air temperature and enhances circulation, raising the top-floor indoor temperature by 3.7 °C. (2) The installation of baffles within the VC contributes to a more uniform vertical distribution of indoor temperature across different floors. (3) As the heat collection efficiency of the PV panels increases, the indoor temperature can be further improved by 3.3 °C. (4) By connecting VC with the atmosphere, the system can be applied in summer without affecting the indoor temperature. The findings demonstrate that BIPV-DSF improves indoor thermal conditions and informs future building PV applications.

【Aim】Athetis lepigone( Mschler)( Lepidoptera: Noctuidae) is a new insect pest in summer corn and causes serious damages to corn seedlings in China. It is very difficult to control this insect pest because its larvae hide beneath the straw and bran of winter corn in the field after harvest by combines.So it is important to study the attractant for A. lepigone larvae. 【Methods】Y-tube olfactometer tests were conducted to investigate taxis responses of A. lepigone larvae to straw,bran,wheat bran,fried wheat bran and corn seedlings. The volatile components of fried wheat bran and wheat bran were analyzed by HS-SPME and GC-MS,and six compounds and eight blends were selected to further conduct the laboratory trapping. 【Results】Among the five materials,fried wheat bran was the most attractive to A.lepigone larvae,and among the six volatile components,2-heptanone( 5 μg /μL) showed the strongest attractiveness to A. lepigone larvae,with the luring rate of 75. 9%. Among eight blends,a threecomponent blend( 2-heptanone + benzaldehyde + p-xylene) strongly attracted A. lepigone larvae with the luring rate of 72. 7%,but its attractiveness effect was lower than that of 2-heptanone. 【Conclusion】The results showed that 2-heptanone has the strongest attractiveness to A. lepigone larvae. These results provide a basis for controlling the larvae of A. lepigone with field trapping.