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In order to improve the feasibility and comprehensiveness of the application of BIM lightweight technology in water conservancy projects, this paper analyzed and summarized the mainstream BIM lightweight technology. Taking Miyun reservoir reconstruction and elimination of hazards project as an example, it put forward the application route of water conservancy project BIM lightweight technology, and improved the application effects of BIM lightweight technology in different construction stages. In the design stage, the comprehensive use of model reduction optimization, rendering optimization and BIM lightweight collaborative design platform can greatly improve the efficiency of three-dimensional model design; By using the BIM lightweight engine to transmit the BIM design model to the construction stage and establishing a BIM lightweight construction management platform, the quality of construction management can be effectively improved, ensuring that the project is completed on time and with quality. For the current status of BIM lightweight technology, this paper puts forward suggestions for future development: BIM lightweight technology should be able to integrate a variety of water conservancy engineering industry characteristics of data, improve the BIM specifications and standards, so that the BIM lightweight application system is more standardized and scientific. [ABSTRACT FROM AUTHOR]

Copyright of Records Management: Journal of the Records Management Society of Japan is the property of Records Management Society of Japan and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the problems of semantic-based underground mine entity modeling method, such as the lack of detail level division, the small degree of freedom of model configuration, and the lack of multi-scale fine expression, parametric modeling and semantic multi-scale ideas are applied to the construction of mine multi-level of detail (LOD) model, and a mine underground space modeling method based on semantic multi-scale is proposed. It is determined that the modeling object is the entity element in mine underground space. The modeling objects are divided into roadway model and in-roadway model according to the position of the entity element. The roadway model comprises a roadway main body model and other artificial structure models, and the in-roadway model comprises a mine facility model and an equipment model. The different semantic classes are defined according to the semantic information of the entity elements. The semantic classes are divided into families, and then the families are decomposed into component elements according to their functions. Each semantic class is described by quantifiable indicators such as semantic attributes, geometric attributes, appearance attributes and characteristic attributes. The mine LOD model is designed, which includes six levels of discrete LOD models, namely roadway network model, roadway rough model, roadway fine model, main facility model in roadway, main equipment model in roadway, and other equipment models in roadway. Combining the discrete LOD model with various attributes can clearly show the level of detail and the primary and secondary relationships of the mine LOD model. The mine underground space modeling method based on semantic multi-scale can provide entity element models with different detail richness, reduce the computational complexity of scene rendering and improve the efficiency and flexibility of model construction.

Copyright of Journal of Computer-Aided Design & Computer Graphics / Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the cloud data collected for Buddhist Incense Tower in the Summer Palace by applying laser scanning technologies, this paper builds a 3D model for the Buddhist Incense, Tower to three-dimensionally record the detail properties of the tower and its components. It turns out that building the database of 3D models and picture archives help to preserve the original data of cultural heritages, including the spatial relationship information and other important types of data, which can contribute to the scientific, accurate and permanent protection of endangered cultural relics. [ABSTRACT FROM AUTHOR]

We discuss the simulation of realistic snow scene and contrive a method of real-time snow rendering. We determine the effective points storing snow based on Quad-tree Level of Detail Model and make these points be adapted to rugged terrain of the ups and downs. In the course of the snow, we further consider the characteristics of the terrain and set the snow collection factor for each point. In rendering an effective point, we compute the normal vectors to improve the interaction with light effects. We introduce "blend" to simulate the gradual increase in the progress of snow and improve the visual effect of snow cover from scratch to have a sense of snow thickness of the traditional methods. Experimental results further show that the method satisfied both the realistic and real-time needs. [ABSTRACT FROM AUTHOR]

In this article, HPLC-FLD was used for determination of nonylphenol polyethoxylate in textiles. The normal method was soxhlet extraction. However, this method used a lot of organic solvent and need long time. The laboratory used ultrasonic wave extraction in order to reduce organic solvent and experiment time. The results indicated there was not much difference between soxhlet extraction and ultrasonic wave extraction. The recovery, precision and LOD of this method were satisfied. [ABSTRACT FROM AUTHOR]