保护剂对混凝土耐久性影响研究

针对无机硅类、硅烷类和有机共聚物3类保护剂对混凝土耐久性的影响进行了研究。重点研究了混凝土涂刷保护剂后吸水率、抗Cl-渗透性能、抗碳化性能、耐污染性能指标的变化,通过以上4项指标综合评定混凝土保护剂对混凝土耐久性的影响。     

钢纤维混凝土在道路面层施工中的应用

因为钢纤维混凝土道路面层施工内容在市政道路施工规范中,有许多不明确的地方,所以着重从钢纤维配合比设计以及施工工艺两个方面,论述钢纤维混凝土在道路面层施工中出现的一些问题及解决措施,为以后的类似工程施工提供可借鉴的经验。     

建筑钢结构制作成本管控要点分析

钢结构在建筑系统中独特的优势已经被广泛认同,因此,钢结构在各类建筑中应用的比重正在逐年稳步提升。面对不断增加的钢结构制造企业的加入和竞争,如何有效控制好制作成本成为了钢结构制造企业重要竞争力的体现。     

道路横断面文件自动生成程序开发与实现

道路横断面文件自动生成程序是采用VBA语言在CAD平台上进行二次开发完成.首先由鼠标拾取该断面中桩点坐标和断面左侧任意一点坐标,输入对应的里程数据;再通过鼠标拾取断面外围缓冲区范围线,让程序搜索缓冲区范围线内各断面特征点的平面坐标和高程信息;最后根据距离反算公式,结合高程信息自动生成道路横断面文件.     

基于商业综合体中复合需求的动线策略研究

本文首先探讨综合体模式下的商业混合趋势及其对设计的影响．并归纳多样商业形态组合的一些基本特点,在分析CCDI三个正在实施的工程实例的基础上,提出三种能够产生更多富于设计价值的空间的动线连接策略。     

建筑节能外围保温隔热处理施工技术探讨

随着城市化进程的加快和居民消费结构的升级,建筑行业作为我国主要的能源消耗行业之一,其能源消耗比例占据了全社会能源消耗比例的30%以上,因此必须采取积极的节能措施。本文结合实际,从建筑节能的现状和意义出发,对建筑外围结构的保温隔热处理施工技术进行了分析。     

丘陵及平原地区市政排水管道设计探讨

我国市政排水管道设计虽有几十年的设计经验可供参考,但在复杂的自然条件下也容易出现一系列设计问题。本文就丘陵地区在市政排水管道设计中应该注意的问题及解决方法进行了分析和研究。     

湘潭市历史建筑和传统街区保护规划研究

本文简要介绍了湘潭市现存历史文化街区的现状,结合国内外先进地区的经验及做法,提出了湘潭市历史建筑和传统街区保护的规划方案及实施措施.     

Sharpening polycrystalline phase boundary for potassium sodium niobate ceramics with MnF2 modification

The influence of anion on structure and performance is unclear in potassium sodium niobate ((K,Na)NbO₃; KNN)-based ceramics, while cation doping has been widely researched. Here, the phase structure and electrical properties are explored in MnF₂-doped KNN ceramics. Significantly, sharp rhombohedral–orthorhombic (R–O) and orthorhombic–tetragonal (O–T) phase boundary as well as reduced diffusion degree is exhibited in the ceramics along with little changed phase transition temperatures due to the optimized F⁻ content at O site, which is different from that of cation replacement for A and B sites. Notably, the domain wall motion is facilitated due to the increased A vacancy and decreased O vacancy along with strengthened polarity, originating from the higher valence state and electronegativity of F⁻ with respect to O²⁻. And then, enhanced ferroelectricity is realized via MnF₂ modification, the piezoelectricity is elevated in turn. This work presents a new idea of anion doping for controlling structure and properties in perovskite materials.     

Design and manufacture of high-filling-efficiency microfluidic devices

In this study, we proposed an efficient method for mass production of high-filling-efficiency microfluidic devices. Precision machining was the main process of device fabrication. The commercially available SolidWorks software was adopted for structure design. Unigraphics software was then used to simulate the machining process. The simulated tooling file was then loaded into a CNC milling machine for mold production. The fabricated metal mold was used for pouring polydimethylsiloxane (PDMS) to obtain high-filling-efficiency microfluidic structures. Finally, plasma-assisted packaging was conducted to tightly bind the PDMS microfluidic structure to the glass substrate. Experimental results showed that the additional semicircular filling structure and expended fill-entry structure can efficiently enhance filling efficiency of the microchannel device. The incubation well array can be completely filled at a relatively short filling time. The proposed highly efficient filling microfluidic device possesses advantages, such as feasibility for mass production and cost effectiveness.