Insect-Infested Wood Remediation by Microwave Heating and Its Effects on Wood Dehydration: A Case Study of Hylotrupes bajulus Larva     

Giuseppe Chidichimo  Francesco Dalena  Antonio Rizza  Amerigo Beneduci 《文物保护研究》2018,63(2):97-103

Wood artefacts are subject to damage by biologic infestations due to bacteria, insects, and fungal species. One of the worst feared attacks is due to the xylophagous insects whose larvae feed on wood by boring galleries, at the expense of building timbers and worked woods. These beetles are responsible for daily destruction of the world’s wooden cultural heritage, and their elimination has been always a big problem for conservation of wood. The need to avoid the use of chemical methods in conservation for pest control has led to the development of various non-chemical, non-toxic treatments. Among these, heating with microwaves (MW) seems to be one of the most promising, since it has already shown its high efficacy in destroying pests. Insect-infested wood remediation by MW heating in conservation is based on the larger thermal increment induced in larvae than in wood, due to their different dielectric permittivity in the GHz frequency range. However, the side effects that may occur due to MW heating of wood, such as dehydration, have never been discussed so far. Here we study the possible application of microwave heating as a remediation method for wood samples infested by the larvae of the insect Hylotrupes bajulus. We show that it is possible to set up exposure conditions able to achieve 100% of larvae death and that are sufficiently mild not to induce significant dehydration of the exposed wood from which shrinkage effects may derive. Indeed, under these conditions, MW-induced wood dehydration on cubic and parallelepiped sweetgum samples can be kept under control and to percentages as low as 0.4% (w/w).  相似文献   

Issues Related to the Restoration of Mirrors of the Wooden paliotto della chiesa del Santissimo Crocifisso all’Albergheria,Sicily (Italy)     

Aria Amato  Elena Arizio  Salvatore Cataldo  Emilio Francesco Orsega  Mauro Sebastianelli 《文物保护研究》2018,63(4):194-200

In this work, the decision-making process involved in the restoration of the eighteenth century paliotto ligneo (wooden altar frontal) della chiesa del Santissimo Crocifisso all’Albergheria of Palermo is presented. Earlier research concerning mirror restoration was based on only a few case studies and the proposed techniques were not suitable for the artwork here. As a consequence, it was necessary to re-examine theories and protocols of modern restoration to plan an appropriate intervention of the altar frontal. Since in this artwork the role of mirrors is not to give back images, as usual, but rather to create special light effects and play of lights, this work aims to find an approach to the restoration of the altar frontal and its decorations that allows a homogeneous overview of the piece. Thus, the mirrors were not substituted or re-created. Only a visual integration of the damaged ancient mirrors was proposed, with the use of metallic-polymeric films, permitting a completely reversible restoration.  相似文献   

Development of the concepts of living and animal in the child   总被引：1，自引：0，他引：1  

Graziella Rusca  Francesco Tonucci 《European Journal of Psychology of Education - EJPE》1992,7(2):151-176

From Piaget’s research down to the most recent work of Carey and Wellman, it has been attempted to describe the development of basic concepts such as living and animal in the child. There have been less frequent attempts to draw from the results of these investigations suitable teachings for correct scientific education at school. The educational system continues to make proposals which clash clearly with the indications of research. The aim of our research is to bridge the gap between these two needs, as well as to study the development of the concept of living and animal in seven to twelve-year-olds and to draw the necessary educational conclusions. In particular, we have investigated how these concepts are modified at the various ages, between boys and girls and between country dwellers, who have a direct experience of animals, and town dwellers, who do not. The results are on the one hand in agreement with those of international research, adding information concerning the variables sex and direct experience, hitherto relatively uninvestigated; on the other, they provide definite indications as to the succession of contents to offer in a science syllabus, to the advisability of taking into account the considerable difference between boys and girls, and to the need to enhance the role of practical experience of exploring and laboratory work in studying natural science.  相似文献   

Knowledge codification and the geography of innovation: the case of Brescia mechanical cluster   总被引：2，自引：0，他引：2  

Francesco Lissoni   《Research Policy》2001,30(9):21

The paper re-examines the twin concepts of knowledge “tacitness” and “codification”, which both the literature on (broadly defined) industrial districts, and some recent econometric literature on “localized knowledge spillovers” have possibly mis-handled. Even within specialized local small and medium enterprises (SMEs) clusters, knowledge may be highly codified and firm-specific. The case study on Brescia mechanical firms shows that knowledge, rather than flowing freely within the cluster boundaries, circulates within a few smaller “epistemic communities”, each centered around the mechanical engineers of individual machine producers, and spanning to a selected number of suppliers’ and customers’ technicians. Physical distance among members of each community vary a lot, but even local messages may be highly codified.  相似文献   

Venture capital investment strategies under financing constraints: Evidence from the 2008 financial crisis     

Annamaria Conti  Nishant Dass  Francesco Di Lorenzo  Stuart J.H. Graham 《Research Policy》2019,48(3):799-812

This paper employs the 2008 financial crisis as an empirical setting to examine how investment strategies of venture capitalists (VCs) vary in the presence of a liquidity supply shock, and what the performance implications of these strategies are for their portfolio startups. We show that while, on aggregate, funded startups receive no less financing during the financial crisis than in non-crisis times, VCs allocate relatively more resources to startups operating in the VCs’ core sectors. We show that this skew allocation follows from VCs choosing to double down on their core-sector investing, rather than by a changed mix of investors or startups during the financial crisis. These effects are strongest for early-stage startups, for which information problems are most severe. Furthermore, these results are driven by the investment strategies of more-experienced VCs. Building on these findings, we find superior ex post performance among crisis-funded portfolio startups operating in more-experienced VCs’ core sectors.  相似文献   

The effect of increasing written approval on Italian students’ academic performance in higher education     

Francesco Sulla  Dolores Rollo  Roberto Cattivelli  Alex Harrop 《Educational Psychology in Practice》2018,34(3):262-271

Increasing teacher verbal approval has been shown to produce both increased pupil “on-task” behaviour and academic achievement. The present study aimed to address gaps in current knowledge about the effect of different kinds of teacher approval, other than verbal approval, on students’ performance. An exploratory study, followed by an experimental study, was conducted with Italian undergraduate psychology students in order to investigate the effect of written approval on their academic performance. The results indicate that, whilst there is some suggestion that students appreciated receiving increased written approval comments on their work, the receipt of such comments was accompanied by poorer academic performance than that of a control group. Possible explanations are presented.  相似文献   

Control-based Connection Admission Control and Downlink Congestion Control procedures for satellite networks     

Francesco Delli Priscoli  Antonio Pietrabissa   《Journal of The Franklin Institute》2009,346(9):923-944

This paper focuses on the resource management procedures for a geostationary (GEO) satellite system. The objective of these procedures is the efficient exploitation of the link resources, while assuring the agreed Quality of Service to the traffic entering the satellite network. The main novelties are (i) the integration between Connection Admission Control and Downlink Congestion Control procedures, and (ii) the original adaptation of Kalman filtering theory to cope with these procedures. The proposed solution is validated by simulations.  相似文献   

Network effects in technology acceptance: Laboratory experimental evidence     

Andrea Pontiggia  Francesco Virili 《International Journal of Information Management》2010

This research analyzes network effects in technology acceptance. The hypothesis is that the size of the user network affects technology acceptance. Even today, empirical measurement of network effects is challenging and there is a lack of experimental evidence. In order to investigate and measure the relationship between network size (number of adopters) and user acceptance, technology acceptance research needs to broaden its scope and approaches. To overcome this limitation we reproduce a particular type of technology acceptance process in a laboratory experiment, controlling for user network size and testing its influence on user perceptions and, ultimately, on acceptance decisions. We measured user perceptions and analyzed the data using consolidated and tested technology acceptance models. The results confirm our hypothesis, showing a significant effect of user network size on user perceptions. Finally, we discuss the theoretical and managerial implications of our approach and findings.  相似文献   

Innovation and Employment: a Reinvestigation using Revised Pavitt classes     

Francesco Bogliacino 《Research Policy》2010,39(6):799-809

The relationship between innovation and employment is addressed in this article through a model and empirical test at industry level for eight European countries in 1994-2004. We investigate this relationship for manufacturing and services and propose a Revised Pavitt taxonomy (covering both of them) in order to identify specific patterns of technological change and job creation and loss. The contrasting effects of strategies of technological or cost competitiveness are investigated using innovation variables from CIS2 and CIS3. Together with demand, wages and industry dynamics, they account for changes in employees and hours worked. The diversity in these relations across industries is also explored; when the model is applied to each Revised Pavitt class, different mechanisms of technological change and effects on jobs emerge.  相似文献   

Cultural heritage interactive 3D models on the web: An approach using open source and free software     

Alberto Guarnieri  Francesco Pirotti  Antonio Vettore 《Journal of Cultural Heritage》2010,11(3):350-353

Cultural heritage sites and artefacts get a significant added value from high-resolution 3D models. These models are increasingly available due to improvements in technology and to higher integration of survey techniques such as laser scanning and photogrammetry. In this paper we present a case study on the development of a web-based application for user access and interactive exploration of three-dimensional models by providing integrated geometrical and non-geometrical information into an intuitive interface. The main feature of this interactive system is to provide the user with a completely new visit experience based on a free interactive exploration interface of the object (i.e., not constrained by any predefined pathway) and on the opportunity to get more detailed information on specific parts of interest. A parallel aim achieved was to use, in data processing and in the architecture, open source tools and free software, thus providing full transparency on adopted methodology and data processing methods, and a cost effective solution both for server and client. Furthermore, the aspect of data size has been considered using a segmentation and simplification scheme and server-side data management to keep transmission size to a minimum, thus improving access speed.  相似文献