意大利历史建筑的修复和保护(节略:意大利具有意义的文化遗产修复实例

基于意大利文化遗产所处的国际地位，我们就应了解在意大利修复文化遗产的意义。根据联合国教科文组织的统计，意大利有60％～7096的世界文化遗产，而实际上4万～万幢历史和文化建筑是私有的，这种遗产不仅数量多且遍布意大利各地，无论从精神上还是经济上都极具价值，这些都直接反映在旅游、商业、工艺及就业方面。     

Infrastructure-level traffic micro-simulation for probabilistic analysis of bridge loads

In state-of-the-art building codes, the traffic loads for the design or assessment of bridges should derive from a probabilistic characterization. However, because traffic depends on the vehicle flow peculiar to the transportation infrastructure of interest, the frequency of exceedance of code-assigned loads is factually unknown. This study presents a methodology to probabilistically characterize the traffic loads on bridges based on network-level traffic micro-simulation and its application to the A56, that is, the urban highway connecting Naples’ (Italy) districts. One year of traffic simulations, in conjunction with structural modeling of the bridges featured in the infrastructure, enabled the probabilistic characterization of the traffic-induced structural demand and the determination of the bridge-specific safety margins along the highway. The results of the study and of the application to A56 ultimately show that: (i) traffic micro-simulation appears to be a suitable approach to bridge-specific structural safety assessment; (ii) structural actions deriving from code-assigned loads tend to be conservative with respect to their traffic-simulation-derived counterparts; and (iii) structural demand induced by traffic loads can vary along the same transportation infrastructure.     

天才创造出的轻盈感:乌拉圭的格拉迪奥·迪埃斯特

见到格拉迪奥·迪埃斯特总会带给你惊奇,不仅仅是因为他的作品具有难以企及的创新意识,他的天才也表现在建筑的原创性和空间处理上,以及他对普通问题的别出心裁的解决。每个解决方案都与众不同和独一无二。他的每个作品都具有这样一个基本理念——轻盈与材料和技术完美融合,“谦卑地遵从自然秩序”。     

Physical characterisation of the sludge produced in a sequencing batch biofilter granular reactor

Sequencing batch biofilter granular reactor (SBBGR) is a recently developed biological wastewater treatment technology characterised by a very low sludge production, among other numerous advantages. Even if costs for sludge treatment and disposal are mainly dependent on the amount of sludge produced, sludge properties, especially those linked to solid-liquid separation, play a key role as well. In fact, such properties deeply influence the type of treatments sludge has to undergo before disposal and the final achievable solids concentration, strongly affecting treatment and disposal costs. As sludge from SBBGR is a special mixture of biofilm and aerobic granules, no information is available so far on its treatability. This study addresses the characterisation of the sludge produced from SBBGR in terms of some physical properties (settling properties, dewaterability, rheology). The results show that such sludge is characterised by good settling and dewatering properties, adding a new advantage for the full-scale application of SBBGR technology.     

Experimental analysis and modelling of bolted T-stubs under cyclic loads

Bolted connections have recently attracted new research efforts after the unexpected failures of welded connections during Northridge and Kobe earthquakes. The criteria and the formulations for predicting the rotational stiffness and the flexural resistance, under static loading conditions, of the most common connection typologies have been codified by Eurocode 3 [CEN. EN 1993-1-8 Eurocode 3: Design of steel structures — Part 1.8 Design of joints. 2005] which is based on the so-called component approach. In order to extend the component approach to the prediction of the seismic response of partial-strength connections, the modelling of the cyclic response of the joint components is necessary. Starting from the observation that the main sources of deformability and plastic deformation capacity of bolted connections can be modelled by means of an equivalent T-stub, an experimental program devoted to the cyclic response of the most important component of bolted connections has been carried out aiming at the modelling of the cyclic force-displacement curve of bolted T-stubs. In this paper, starting from the analysis of the results of the experimental tests performed, stiffness and strength degradation rules are derived as a function of the displacement amplitude required at any cycle and of the energy dissipated in the previous loading history. The combination of these rules with the theoretical prediction of the monotonic envelope leads to a proposal for predicting the cyclic behaviour of bolted T-stubs starting from the knowledge of their geometrical and mechanical properties.     

古村落宅间元素的分类及其平面特征解读——以安徽省黄山市关麓村为例

Spatial elements between courtyards are an important component of the landscape of historical villages. With an increasingly homogenous rural landscape in China, most existing studies focus on traditional symbols and architectural details, while little research is conducted to explore the core elements that shape the spaces between village courtyards. Taking Guanlu Village in Huangshan City, Anhui Province as an example, the research team identified 28 sorts of spatial elements, developed the corresponding diagrams, and quantified their morphological characteristics in area, circularity, rectangularity, compactness, and width-length ratio. This research not only contributes to the theoretical development on the morphology of ancient villages, but also helps promote the exploration and application of local elements. This village landscape design model constituted with element categorization, diagram drawing, and morphological quantitative analysis would provide scientific evidences that help inform the practices to revitalize village localities, showing its practical significance of enriching the design vocabulary of village landscapes and avoiding the prevailing, generic usage of modular designs with urban landscape elements.     

Swinging-bell resonances and their cancellation identified by dynamical testing in a modern bell tower

The occurrence of the resonance phenomenon causes high amplitude dynamic vibrations in slender structures. This paper presents an archetypal example, including analysis and mitigating intervention, based on the real case study of a bell tower. Resonances between the multi-harmonic swinging motion of five oscillating bells and the first natural frequency of the supporting system, namely a modern tower realized in reinforced concrete, are clearly demonstrated. Using ambient vibration acceleration measurements, the modal parameters of the tower are identified consistently by two different output-only procedures: the first, based on the Complex Mode Identification Function, exploits a frequency representation of the response; the second, based on the Stochastic Subspace Identification Method, works in the time domain. The frequency characteristics of the bell-swinging action are determined through spectral analyses of the structure forced response signals, measured during the swinging motion of each bell separately. The closeness of the tower’s first natural frequency with the third harmonic of the dynamic horizontal force transmitted to the structure by the two heaviest swinging bells is recognized as the source of large oscillations. A finite element model is developed and manually updated to accurately reproduce the tower’s spectral properties and to design a structural intervention for the vibration mitigation. The resonance cancellation obtained through the introduction of a stiffening strut is demonstrated to limit the bell-induced oscillations effectively, as verified by a post-intervention dynamic test campaign.     

Effects of harvest date, wilting and inoculation on yield and forage quality of ensiling safflower (Carthamus tinctorius L.) biomass

BACKGROUND: Safflower (Carthamus tinctorius L.), usually grown as a source of oil crop, can be used as fodder either for hay or ensiling purposes, particularly in semi‐arid regions. RESULTS: A 2‐year trial was conducted in southern Italy to evaluate the production and forage quality of safflower biomass cv. Centennial, harvested at three different stages: 1, at complete appearance of primary buds (PB); 2, at complete appearance of secondary and tertiary buds (STB); and 3, at 25% of flowering stage (FS). For each stage of growth, 50% of the biomass was ensiled in 4 L glass jars without and with inoculation (Lactobacillus plantarum, LAB), and the other 50% was field wilted for 24 h before ensiling. Dry matter (DM) content and yield (DMY), pH, buffering capacity (BC) and water soluble carbohydrates (WSC) were determined on fresh forage. On safflower silages were also evaluated ammonia‐N, crude protein (CP), fibre fractions, fat, lactic and acetic acids, Ca and P, and gas losses. DMY ranged from 4.5 t ha^?1 (PB harvesting) to 11.6 t ha^?1 (FS harvesting). DM content varied from 129 g kg^?1 (PB not wilted) to 630 g kg^?1 (FS wilted). The WSC in forage before ensiling with not wilting ranged from 128 (PB stage) to 105 and 100 g kg^?1 DM at STB and FS stages, respectively. The wilted safflower forage showed a lower WSC compared to wilted forage. The high sugar substrate allowed lactic acid fermentation and a good conservation quality in all the harvesting stages. Silages quality was strongly influenced by the treatment performed. Wilting practice increased DM, pH and NDF contents but reduced lactic acid, acetic acid and NH₃‐N values. Inoculation reduced DM, pH and NDF contents, but increased lactic and acetic acids, CP and ash. CONCLUSION: As result, wilting the forage for 1 day was very effective in the early harvesting stage because this practice significantly increased DM, reducing on the same time the intensive fermentation and proteolysis processes of silage. When harvesting is performed at the beginning of the flowering stage wilting is not necessary. Copyright © 2011 Society of Chemical Industry     

Characterization of flocculent Saccharomyces interspecific hybrids for the production of sparkling wines

Interspecific hybrids obtained from flocculent Saccharomyces cerevisiae and non-flocculent Saccharomyces uvarum (S. bayanus var. uvarum) are flocculent to a higher degree and have the capacity to ferment well at both low and high temperatures, from 6 to 36 degrees C. These interspecific hybrids generate minor compounds of fermentation in intermediate quantities with respect to the parent strains and produce high-quality sparkling wines, which are not inferior to those of the parent strains. For these reasons, interspecific strains are particularly adapted to production of sparkling wines that are re-fermented in bottles.