Collineation measurement: A method for constructing the imperial citadel of Thang Long in harmony with nature

The Imperial Citadel of Thang Long is a crucial case in ancient Vietnam’s planning and design history. Although historical materials indicate that the orientation of the Imperial Citadel of Thang Long has a dialectical unity relationship with the surroundingmountains, current research is only speculative generalization and lacks empirical analysis. Based on existing findings, this paper identifies the collineation measurement as a generalmethod in the Sinosphere countries for determining spatial orientation. Using a mixed-method of historical archives, fieldwork and simulation model, this paper summarizeshistorical cluesandthreedesignperspectives related to spatial orientation by statistical analysis. Further, it analyzes the logic and application of collineation measurement in constructing the Imperial Citadel of Thang Long. The results show that Vietnamese designers used Tàn Viên Mountain as a component of Thang Long city by collineating the twomountain peaks to the west. Tàn Viên Mountain and the highlands extending eastward fromit are used as the key to establishing the position of the Imperial Citadel, setting the spatial structure of human settlements, and the development of city space. The location, layout, and formof important buildings in the Imperial Citadel are also closely related to the surrounding landscape within 50 km.     

Failure load prediction and optimisation for adhesively bonded joints enabled by deep learning and fruit fly optimisation

Adhesively bonded joints have been extensively employed in the aeronautical and automotive industries to join thin-layer materials for developing lightweight components. To strengthen the structural integrity of joints, it is critical to estimate and improve joint failure loads effectually. To accomplish the aforementioned purpose, this paper presents a novel deep neural network (DNN) model-enabled approach, and a single lap joint (SLJ) design is used to support research development and validation. The approach is innovative in the following aspects: (i) the DNN model is reinforced with a transfer learning (TL) mechanism to realise an adaptive prediction on a new SLJ design, and the requirement to re-create new training samples and re-train the DNN model from scratch for the design can be alleviated; (ii) a fruit fly optimisation (FFO) algorithm featured with the parallel computing capability is incorporated into the approach to efficiently optimise joint parameters based on joint failure load predictions. Case studies were developed to validate the effectiveness of the approach. Experimental results demonstrate that, with this approach, the number of datasets and the computational time required to re-train the DNN model for a new SLJ design were significantly reduced by 92.00% and 99.57% respectively, and the joint failure load was substantially increased by 9.96%.     

被动区土体加固技术在福州软土地区深基坑中的应用

本文针对被动区加固技术在福州软土地区的应用,结合福州市民服务中心工程的工程实际情况,通过分析研究被动区加固技术的作用原理,对水泥土搅拌工艺技术进行总结和改进。     

分析大学计算机基础课程教学改革的思考与实践

目前，大学计算机基础课程不仅是计算机专业的必修课目，也是非计算机专业必修公共课的重要组成部分。计算机水平的高低直接影响着学生毕业后的就业，在大学教育中占有重要的地位。然而，我国的大学计算机基础课程中还存在一些问题。本文将通过分析大学计算机基础课程的现状，进而提出大学计算机基础课程教学改革的实践，着重分析在更新教学观念、优化教学内容、革新教学方式、完善考核方式、增强激励机制等方面的实践，力求为找到进一步提高计算机基础课程教学质量的方法提出思路及实践参考。     

化工原理课教学方式的改革与探索

为调动学生自主学习兴趣,培养其解决工程实际问题的能力和创新能力,我们对化工原理课程(理论课、实验课和课程设计)的授课方式等进行了改进,即在教师的配备、教学内容及时间的设置上,进行了改进,并提出了改进的具体措施,取得了成效。     

红外温度测量系统的应用

介绍了红外测温仪在焦炉上的应用,通过在线自动测量迅速反应焦饼温度,对焦炉的热工调节进行指导,同时减轻了操作强度,提高了测量精度,改善了热工调节。     

120kt/a磷铵装置除尘、洗涤系统技术改造提高装置运行效率

我公司120 kt/a磷酸二铵生产工艺由于尾气洗涤及除尘系统设计缺陷,长期存在粉尘及氨外溢严重,生产周期短等问题。通过对上述系统的改造:将造粒与干燥尾气分开洗涤,对部分设备尺寸及各级洗涤介质进行调整;在现场环境改善、氨回收率提高、生产周期延长等方面都取得了较好效果。     

PCA系列自制聚羧酸高效减水剂的性能研究

在自制聚羧酸缓凝减水剂PCA基础上,通过掺加单体总质量15%丙烯酰胺,聚合得到聚羧酸减水剂PCA-AM15;通过添加还原剂V降低反应能耗,常温聚合得到聚羧酸缓凝减水剂PCA-AMV15。对PCA、PCA-AM15和PCA-AMV15进行水泥净浆性能测试。结果表明,在水灰比0.29,掺量为水泥质量0.3%的情况下,PCA-AM15具有良好的净浆力学性能,减水率达到35.2%,缓凝效果低于PCA,初凝和终凝时间分别为453 min和647 min,3 d、7 d和28 d水泥净浆试块抗压强度分别达到了70.9 MPa、89.5 MPa和97.4 MPa,优于PCA;由于还原剂V的加入,PCA-AMV15净浆力学性能与PCA-AM15相似,3 d、7 d和28 d水泥净浆试块抗压强度分别达到了69.0 MPa、86.4 MPa和97.0 MPa。在保持产品性能基本不变的情况下,通过适当丙烯酰胺和还原剂V可调整产品质量及成本。     

三七挥发性物质的气相色谱分析

本项目利用气相色谱-质谱联用仪对中药三七蒸汽溶液进行分析研究,建立了相应的测定方法及获得相应的气相色谱图谱。通过检索美国国家标准与技术局(NIST)的质谱图库,测得了19种可能化合物,其中2-甲氧基-4-(1-丙烯基)-苯酚、十四烷酸、十八碳二烯酸、二十五烷的可信度达95%以上。     

用反射片配合全站仪监测基坑围护结构深层水平位移理论研究

在深基坑开挖过程中,监测为安全施工保驾护航,对施工工艺、参数的调整起着指导性作用,为优化设计及今后的类似工程积累经验,提供参考依据。围护结构深层水平位移监测是基坑安全监测最重要的项目之一,但施工过程中不可避免的会造成测斜管破坏,使得围护结构位移无法监测。本文从理论上分析研究,证明了用反射片配合全站仪可以对围护结构深层水平位移进行补救监测。