Nanocellulose-based reusable liquid metal printed electronics fabricated by evaporation-induced transfer printing

Reusable electronics have received widespread attention and are urgently needed. Here, nanocellulosebased liquid metal(NC-LM) printed circuit has been fabricated by the evaporation-induced transfer printing technology. In this way, the liquid metal pattern is embedded into the nanocellulose membrane, which is beneficial for the stability of the circuit during use. Besides, the NC-LM circuit is ultrathin with just tens of microns. In particular, the finished product is environmentally friendly because it can be completely dissolved by water, and both the liquid metal ink and the nanocellulose membrane can be easily recollected and reused, thereby reducing waste and pollution to the environment. Several examples of flexible circuits have been designed to evaluate their performance. The mechanism of evaporation-induced transfer printing technology involves the deposition, aggregation, and coverage tightly of the nanosized cellulose fibrils as the water evaporated. This study provides an economical and environmentally friendly way for the fabrication of renewable flexible electronics.     

Effects of porosity,dry unit weight,cement content and void/cement ratio on unconfined compressive strength of roof tile waste-silty soil mixtures

One of the conventional ways to improve the mechanical behavior of soils is to mix them with cementing agents such as cement, lime and fly ash. Recently, introduction to alternative materials or sub-products that can be adopted to improve the soil strength is of paramount importance. Therefore, the present study aims to investigate the effects of porosity (η), dry unit weight (γ_d) of molding, cement content (C) and porosity/volumetric cement content ratio (η/C_iv) or void/cement ratio on the unconfined compressive strength (q_u or UCS) of silty soil–roof tile waste (RT) mixtures. Soil samples are molded into four different dry unit weights (i.e. 13 kN/m³, 13.67 kN/m³, 14.33 kN/m³ and 15 kN/m³) using 3%, 6% and 9% cement and 5%, 15% and 30% RT. The results show that with the addition of cement, the strength of the RT–soil mixtures increases in a linear manner. On the other hand, the addition of RT decreases q_u of the samples at a constant percentage of cement, and the decrease in porosity can increase q_u. A dosage equation is derived from the experimental data using the porosity/volumetric cement content ratio (η/C_iv) where the control variables are the moisture content, crushed tile content, cement content and porosity.     

“水城”计划：柏林城市滨水地带的复兴

城市滨水地带曾经在工业的发展中发挥过巨大的作用。进入后工业社会以来，随着经济社会形态和产业结构的变化，城市中的滨水工业生产用地以及仓储用地相继被废弃。这些已经被污染的用地尽管需要花费高昂的代价去整治，但也具有很高的商业开发价值。本文介绍了德国统一之后柏林城市滨水地带再开发的两个大型项目实例，以期为国内类似问题和项目的研究提供借鉴和参考。     

Potential for potable water savings by combining the use of rainwater and greywater in houses in southern Brazil

Research on rainwater and greywater have been performed all over the world as a way of promoting potable water savings. The main objective of this article is to evaluate the potential for potable water savings by using rainwater and greywater in two houses in southern Brazil. An economic analysis is performed to evaluate the benefits of using rainwater and greywater either separately or together. Results indicate that the potential for potable water savings in both houses range from 33.8% (house B) to 36.6% (house A), considering that water for toilet flushing and washing machine does not need to be potable. By using rainwater, the potable water savings in house A would be 35.5% and in house B, 33.6%. When greywater is considered alone, potable water savings are lower, i.e., 30.4% in house A and 25.6% in house B. As for the use of rainwater and greywater combined, the potable water savings are 36.4% in house A and 33.8% in house B. The three systems that were investigated seem not to be cost effective as the payback periods were very high (above 17 years), but the greywater system was the most attractive one. The main conclusion that can be made from the research is that there needs to be government incentives in order to promote the use of rainwater or greywater in houses in southern Brazil.     

我国城市更新进程与建筑改造设计

改革开放以来,随着社会经济的发展,我国的城市建设与建筑更新进入了加速发展的阶段.建筑改造是城市更新的主要内容之一,有关建筑的改造设计,在当今中国面临着严峻的挑战.该文从国内外城市更新进程及其相关理论入手,通过对我国建筑改造的类型与实践的总结,指出了我国现阶段城市更新中的建筑新建与改造设计并举的方法是一种行之有效的途径.     

某污水处理厂中水-高温热泵供暖方案比较

某污水处理厂项目,设计以中水作为热源利用高温热泵提供70℃热水,为暖气片末端供暖,从而达到“节能、环保”,节约运行费用的目的。     

Planning gang formwork operations for building construction using simulations

Concrete formwork is a labor-intensive and time-consuming operation. Many modular formwork systems have been developed to automate the process. Such systems improve the productivity as well as the cost-effectiveness of the operation. However, proper planning for the form reuse schemes in the design as well as the construction phases of a building, including resource allocations (modular form sets, cranes, workers, etc.), and the construction sequence, is vital for ensuring a successful use of modular formwork systems. Computer process simulation techniques are employed in this research for the study of different form reuse schemes to use gang forming systems in building construction. Five form reuse schemes are identified. The CYCLONE modeling methodology is employed to develop computer models for each of them. MicroCYCLONE simulations and sensitivity analyses of the schemes, using different numbers of form sets, cranes, and labor crews, are then conducted for a real case to assess their impact on the productivity as well as the cost-effectiveness of the operation. The objective is to better understand the characteristics of different form reuse schemes and, in turn, to produce better plans for gang forming construction. Thus, the application of modular formwork systems in building construction can be facilitated.     

面向VANETs的服务质量的一种信道分配的新算法

车辆的高速移动,导致频繁地进行呼叫切换,这就使得信道分配成为车联网VANETs( Vehicular Ad Hoc Network)中最受关注的研究热点。为此,提出一种新的信道分配算法,标记为SBC算法。该算法引用信道再使用技术( Channel Reuse Technique)、信道借用( Channel Borrowing),并依据车辆行驶的速度计算发生切换的时间,从而提高服务质量QoS( Quality of Service)。仿真结果表明,提出的SBC算法在呼叫阻塞概率、丢失率和切换时延方面表现良好的性能。     

顺水而为: 武汉长江主轴滨水公园

The evolution of the Yangtze Riverfront Park in Wuhan, China highlights what many waterfront cities around the world are facing with respect to converging forces of urbanism, growth, resiliency, and ecological degradation. This site emphasizes why the public realm is a critical component in addressing all of these often-conflicting issues. By re-envisioning the 16-kilometer-longriverfront landscape, Wuhan is creating a new paradigm for its parks by embracing flooding as a regular occurrence and a driving force in the shaping of its public realm. This strategy of working with Nature and not against it allows visitors to understand and appreciate the river’s complex dynamics. The proposed development of the Yangtze Riverfront Park aims to harness the power of natural processes to nurture a rich regional ecology, improve ecosystem services, and enhance public health and recreational amenities. Informed by an extensive public engagement process and crowdsourced data, the redesign of the park reinforces Wuhan’s cultural identity by preserving decommissioned industrial infrastructure and other artifacts along the river that symbolize the city’s industrial legacy and urban history. The vision for an updated Yangtze Riverfront Park strives to create a socially inclusive, culturally relevant, and ecologically meaningful waterfront that emphasizes Wuhan’s identity of living authentically with an everchanging river.     

1970年以后欧美建筑再利用的学术发展概览

本文介绍了西方关于建筑再利用的理论研究和教学概况，以期为国内更好地理解建筑再利用问题以及将来 开展相关研究、教学和项目实践提供些许参考。本文第一部分介绍了建筑再利用的理论研究，从建筑学领域和遗 产保护领域这两个方面分开阐述，建筑学领域关于建筑再利用的理论研究主要分为类型学、技术派、建筑策略和 室内设计等方向，遗产保护领域关于建筑再利用的专门讨论是近几年才开始的，主要包括适应性再利用、可持续 再利用和共同演变式再利用等方向。第二部分介绍了建筑再利用的教学情况，首先以米兰理工大学为例介绍了建 筑学科下关于建筑再利用的专业课程教学，接着以美国罗德岛设计学院和比利时哈瑟尔特大学等高校为代表介绍 了关于建筑适应性再利用的专业硕士培训项目，最后介绍了欧盟关于现代主义建筑再利用以及其他高校关于建筑 再利用的硕士培训项目。