建筑涂料用苯丙乳液的研制

本文采用自由基乳液聚合方法，通过苯乙烯，丙烯酸丁酯和丙烯酸三元共聚反应，合成了建筑涂料用的苯丙乳液。通过大量的实验确定了反应配方及加料方式，并详细讨论了各组分及反应条件对聚合反应和产品性能的影响。     

基坑深层搅拌桩及超前钢管的施工与质量控制

以广东移动通信枢纽大楼的基坑支护为例，介绍基坑深层搅拌桩和超前钢管的施工及质量控制。     

Study of the uncertainty of façade sound insulation measurements: Analysis of the ISO 12999-1 uncertainty proposal

The result of a measurement is an approximation of the true value of the measurand and is complete when it is accompanied by its uncertainty. Building acoustics requires an assessment of the uncertainties that is understandable and corresponds closely to reality. The new standard ISO 12999-1 gives general uncertainty values for typical sound insulation measurements. The objective of this work is to determine the most accurate method for evaluating the uncertainty of in situ façade sound insulation measurements for both the D_ls,2m,nT values in one-third octave bands and the global magnitude D_ls,2m,nT,w. We establish a comparative analysis between the uncertainty values proposed by the standard ISO 12999-1, the uncertainty values deduced from interlaboratory activities and the average uncertainties deduced from individual calculations for each in situ measurement. The comparison is based on uncertainty calculations for around 1000 in situ façade sound insulation measurements made by our laboratory. The uncertainties given by the standard ISO 12999-1 for D_ls,2m,nT in one-third octave bands are, at low and high frequencies, higher than the values deduced from individual calculations and smaller than the calculated values at mid frequencies. We believe that for D_ls,2m,nT, it is advisable wherever possible to make individual uncertainty calculations for each in situ façade measurement. Nevertheless, the comparison with ISO 12999-1 points to the suitability of including some uncertainty components in the calculation, such as the related to the measurement procedure or source directivity, which are not normally considered in the uncertainty evaluation. Although we have clearly endorsed the use of individual calculations to determine the uncertainty of the sound insulation magnitude in one-third octave bands, we believe the uncertainty proposed by standard ISO 12999-1 could be a more realistic and reasonable approximation for the global magnitude D_ls,2m,nT,w. Therefore if an individual calculation of the uncertainty of the global magnitude is required the Monte Carlo simulation has been shown to be a good method.     

A High-Performance Nonlinear Optical Crystal with a Building Block Containing Expanded π-Delocalization

Common nonlinear optical (NLO) crystals consist of traditional functional building blocks with inherent optical limitation. Herein, inspired by traditional (B₃O₆)³⁻ inorganic building block, we theoretically identified a new type of organic functional building blocks and then successfully synthesized the first cyamelurate NLO crystal, Ba(H₂C₆N₇O₃)₂ ⋅ 8 H₂O. To our surprise, the constituent (H₂C₆N₇O₃)⁻ building block is not in structurally optimal arrangement, but Ba(H₂C₆N₇O₃)₂ ⋅ 8 H₂O exhibits excellent optical properties including wide band gap of 4.10 eV, very large birefringence of 0.24@550 nm, and exceptionally strong second-harmonic generation (SHG) response of about 12×KH₂PO₄. Both the SHG response and birefringence are much larger than those of commercial NLO crystal β-BaB₂O₄ with optimally aligned (B₃O₆)³⁻ building block. Theoretical calculations suggest that the expanded π-conjugation delocalization within (H₂C₆N₇O₃)⁻ vs (B₃O₆)³⁻ should be responsible to the enhanced performance. This work implies that there is still much room to develop new NLO crystals with excellent functional building blocks that may be longly neglected.     

CFG桩复合地基在碧海云天住宅楼中的应用

通过碧海云天住宅楼工程实例,阐述了CFG桩复合地基的方案设计、施工工艺、理论计算与现场实际验证等,以期对相关工程的施工有借鉴作用。     

Acoustic and thermal field investigation of low-cost dwellings, a case study in Brazil

The present paper presents acoustic and thermal performance evaluations carried out in low-cost houses located at the Vila Tecnológica de Curitiba (Technological Village of Curitiba), in Curitiba, Brazil. Two dwellings were evaluated, which were built according to different building systems: (1) the building system Batistella, built with pre-fabricated modules and elements, composed of reforestation wood and (2) the building system Constroyer, composed of expanded polystyrene (EPS) plates, framed in a welded iron mesh, with structural plastering. For the thermal performance evaluation, it was verified that the materials used in the envelope were quite significant for controlling heat gains and losses through the building elements as well as for regulating heat storage. In this case, the system with highest thermal inertia presented better results. Results showed that both building systems had poor acoustic performance, characterized by a low weighted apparent sound reduction index of the façade dB. The German DIN 4109 Norm recommends a minimum of dB. The weighted apparent sound reduction index measured for internal walls was dB and dB, for the building systems Battistela and Constroyer, respectively. The minimum required by German regulation VDI 4100 is dB, for internal walls.     

推动绿色建筑发展的思考

面对日益严重的自然环境与建筑能耗问题,绿色建筑越来越成为未来建筑业发展的主流和建筑业可持续发展的必然选择。本文通过对绿色建筑发展现状、意义的阐述,探讨了我国绿色建筑的发展存在的必要性。     

Chiral building blocks from biomass: 2,5-diamino-2,5-dideoxy-1,4-3,6-dianhydroiditol

An efficient route towards the synthesis of 2,5-diamino-2,5-dideoxy-1,4-3,6-dianhydroiditol 4 has been developed resulting in significant improvements in both isolated yields and purity when compared to literature procedures. As a consequence, resin-grade 2,5-diamino-2,5-dideoxy-1,4-3,6-dianhydroiditol 4 has become available for laboratory scale step-growth polymer synthesis. Additionally, an interesting renewable chiral 2-amino-2-deoxy-1,4-3,6-dianhydroiditol 10, has been isolated.     

Hydrothermal synthesis and structures of organic–inorganic hybrid solids based on arsenic-vanadate building blocks

Four novel organic–inorganic hybrid arsenic-vanadate complexes, [Cu(phen)][(As^VO₄)(V^V ₃O₇)(H₂O)] (1), [Cu(en)₂]₂[As₈V₁₄O₄₂(H₂O)]?·?2.5H₂O (2), [M(1,10-phen)₃]₂[As₈V₁₄O₄₂(H₂O)_0.5]?·?0.5H₂O (M?=?Mn, 3, Cd, 4) (1,10-phen?=?1,10-phenanthroline) have been hydrothermally synthesized for the first time and characterized by elemental analyses, XPS spectra, EPR spectra, IR spectra, TG analyses and single crystal X-ray diffraction. The structure of compound 1 consists of arsenic vanadate ribbons coordinated by the [Cu(phen)]²⁺ complex, while compounds 2 to 4 possess a spherical [As₈ ^IIIV₁₄ ^IVO₄₂]^4? cage with H₂O molecules encapsulated. The unexpected preparation 1 and the synthesis of compounds 2 to 4 on the basis of same polyoxoanion structures show that the pH value of the reaction plays a crucial role in controlling the basic architectures.     

Applications of Terahertz Spectroscopy in the Field of Construction and Building Materials

Abstract: In last two decades, rapid development in the field of terahertz (THz) technology has opened new possibilities for creating innovative imaging and sensing systems. Although the applications of THz technology in different sectors constantly increase, the construction industry lags behind them. The aim of this article is to review the current applications of THz spectroscopy in research and industry related to construction and building materials, along with the key drawbacks of technology and recommendations for future use. The review concludes that THz spectroscopy and imaging have promising potential and provide many opportunities for applications in construction and building materials characterization.