日本建成遗产保护方法的发展

日本建成遗产保护方法兼具有传统和现代特征,文章通过四个主要阶段来阐释日本建成遗产保护方法的发展过程:传统的修缮实践、明治时期现代建成遗产保护的开端、法隆寺修缮的转折点,以及当代的后续挑战。文章追溯了日本建成遗产保护方法的历史背景,通过各个阶段关键的修缮实例以及文献资料来剖析保护方法的特征和演变过程。     

历史建筑修复的“真实性”批判

文章以批判的历史意识和保护价值观,对历史建筑保存和修复在观念背景和操作策略上的演进作了深度探讨;对修复中辩证看待历史“真实性”提出了个人见解;并对历史建筑废墟复原和重建的必要性和可能性作了理论和实践上的分析和澄清。     

面向全变分图像复原的增广拉格朗日方法综述

图像复原旨在根据退化图像重建高品质原始图像,其复原的质量和速度问题一直都是图像处理领域研究的重要方向。由于其图像边缘保持特性,全变分（TV）最小化模型在图像复原领域取得了很大的成功。然而,全变分图像复原是一个典型的非光滑优化问题,需要发展相应的快速优化算法,而增广拉格朗日方法（ALM）则是近年来发展起来的一类代表性方法。结合相关进展,综述了全变分图像复原模型,变量分裂（VS）法和典型ALM算法,并通过实验从CPU运行时间、峰值信噪比（PSNR）和品质评价等方面分析了不同的变量分裂和ALM方法对图像复原性能的影响。     

Implementation of self-healing function in ATM networks

This paper proposes an implementation scheme for the self-healing function in ATM (Asynchronous Transfer Mode) networks and assesses its performance in a developed experimental system. First, our proposed ATM self-healing scheme is described. This scheme realizes more rapid restoration of failed Virtual Paths than other self-healing algorithms, supports the node failure case, and minimizes the spare resources required. Next, an implementation scheme is proposed. We propose that the self-healing function can be implemented as a software process, and that OAM (Operation, Administration, and Maintenance) cells be utilized for fast message transmission. Next, results of a prototype system that we implemented on an ATM cross-connect system are discussed. The fundamental characteristics of restoration performance are measured using the experimental system. Based on these results, restoration characteristics of real world scale networks are estimated by computer simulations. The simulation results indicate that any-one link failure is completely restored within 2 seconds.     

步进电动机的软件脉冲分配

介绍了一种步进电动机软件脉冲分配的方法。按照要求的脉冲分配顺序将步进电动机的绕组通电节拍制成表格，软件采用查表的方式取出通电节拍输出到功放电路。采用软件环分，降低了硬件成本，提高了驱动电源的可靠性，便于实现变拍驱动。提出了步进电动机绕组通电状态保存和恢复的方法，解决了驱动电源上电后电动机转轴发生偏移的问题，提高了步进电动机的定位精度。     

广州骑楼街区保护与改造现象剖析

广州对旧城区中的传统骑楼商业街的改造,经历了从成片拆掉到对典型商业街保护修整的尝试,透过现象分析骑楼街区在城市发展中的地位,探讨对其保护应以尊重传统街区的历史环境氛围为出发点,以一种动态,多方面综合的方式,促进传统骑楼街区的持续发展。     

Assessment of phase formation in lime-based mortars with added metakaolin, Portland cement and sepiolite, for grouting of historic masonry

Lime-based mortars containing pozzolanic additions of metakaolin, sepiolite and white Portland cement are studied in order to determine their performance as historic masonry conservation mortars. Hydration products on metakaolin-lime blended mortars include stable and metastable phases. The presence of such products has been studied by means of DTA and XRD analysis, concluding that the selection between them is mainly related with the water-lime ratio. Sepiolite addition to metakaolin-lime mortars has shown to inhibit C₄AH₁₃ formation. Therefore, the influence of phase distribution on the mechanical resistance is considered. Finally, compounds production on blended lime-white Portland cement was compared to natural hydraulic lime ones, and as a result, no remarkable differences appeared, apart from traces of possible cement Portland addition to the latter, usually not mentioned in the nominal composition supplied by the manufacturers of lime binders.     

矿区废弃地再利用与体育场地建设

矿山废弃地占用大量土地资源,对生态环境也有着巨大的破坏作用。本文通过对矿区废弃地改造模式进行探讨,初步提出了矿区废弃地改造为体育场地的开发模式,结合相关案例对体育场地可建设类型及适用范围进行了分析,并为矿区体育场地建设提出制度保障及政策性建议。将废弃工矿区土地再利用与体育设施建设相结合,在改善矿区环境的同时不仅能够加快矿区产业转型,更能促进社会体育公共服务发展。     

智能光网络在通信网中的应用研究

ASON技术融合了SDH的功能特性、高效的IP技术、大容量的DWDM和网络控制功能,具有高速率、高带宽、高覆盖和高可靠性的特点。分析了智能光网络的3种模型和功能结构,且ASON基于格状网的恢复技术,可以为光纤通信网带来更灵活的网络结构、更多样的业务保护策略和更可靠的业务生存能力,也可以降低网络运营总体成本。针对ASON的特点,提出了分布式的恢复与保护机制,并分析了其优点,对通信网的建设具有一定的参考意义。     

Coherent Structure Dynamics in Turbulent Flows Past In-Stream Structures: Some Insights Gained via Numerical Simulation

Large-scale coherent vortical structures in natural streams and rivers dominate flow and transport processes and impact the stability of stream banks, the diversity and abundance of organisms, and the quality of running waters in aquatic ecosystems. Thus, understanding and being able to model the dynamics of energetic coherent structures in such flows at ecologically relevant scales are crucial prerequisites for developing a science-based ecosystem restoration framework. We review recent progress toward the development of coherent-structure-resolving (CSR) computational fluid dynamics techniques, based on hybrid URANS/LES modeling strategies, for simulating turbulent flows in open-channels with hydraulic structures. CSR simulations of the turbulent horseshoe vortex (THSV) past bed-mounted piers explained the physical mechanism leading to the experimentally documented bimodal velocity fluctuations of the vortex and underscored the importance of the Reynolds number as a key parameter governing the THSV dynamics. Simulations of high Reynolds number flows past surface-piercing, groynelike structures in open channels revealed the complexity of the recirculating region at the upstream face of the groyne, underscored the interaction of the flow in this region with the energetic shear layer shed from the point of separation at the upstream side wall, and demonstrated the importance of flow depth in the vorticity dynamics of such flows. The paper also identifies areas for future work and modeling challenges that need to be addressed for the computational tools to be able to accurately predict flow and transport processes in real-life aquatic environments.