The Experts below are selected from a list of 31740 Experts worldwide ranked by ideXlab platform
Roberta Rabellotti - One of the best experts on this subject based on the ideXlab platform.
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Knowledge and Information Networks: Evidence from an Italian Wine Local System
2005Co-Authors: Andrea Morrison, Roberta RabellottiAbstract:A well-grounded empirical and theoretical literature shows that local production systems can benefit from external economies generated by a shared ‘Industrial Atmosphere’. Many scholars would agree that in contexts as Industrial districts, clusters and local systems, economic actions are strongly embedded in social and institutional factors. Nevertheless, many scholars would instead debate about the nature, boundaries and processes underpinning ‘Industrial Atmosphere’. This paper aims at contributing to this field of studies by entering into the black box of the ‘Industrial Atmosphere’ reconstructing the informal contacts underpinning collective learning in a local production system. The study is based on empirical evidence collected at firm level in an Italian wine local system and uses methods of network analysis.
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is there an Industrial district model footwear districts in italy and mexico compared
World Development, 1995Co-Authors: Roberta RabellottiAbstract:Abstract In this paper we present the results of empirical research carried out in two footwear clusters located in Italy, the “land of Industrial districts”, and two clusters of footwear enterprises in Mexico. The aim of the study is to present a comparison between the ideal-typical Industrial district, as it is defined in the literature, and the case studies in Mexico and Italy. Material from a survey of clusters of firms in Italy and Mexico reveals how clusters in both countries differ in some aspects from the “textbook” model. Similarities and differences are investigated in some detail, and attention is given to the intensity and quality of backward and forward linkages, the existence of an “Industrial Atmosphere” and the nature and extent of institutional support.
Junhua Dong - One of the best experts on this subject based on the ideXlab platform.
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Corrosion kinetics and patina evolution of galvanized steel in a simulated coastal-Industrial Atmosphere
Journal of Materials Science & Technology, 2019Co-Authors: Chuang Qiao, Junhua Dong, Lianfeng Shen, Long Hao, Jing Liu, Bo LiuAbstract:Abstract The corrosion kinetics and patina (corrosion products) layer evolution of galvanized steel submitted to wet/dry cyclic corrosion test in a simulated coastal-Industrial Atmosphere was investigated. The results show that zinc coating has a greater corrosion rate during the initial period and a lower corrosion rate during the subsequent period, and the patina composition and structure can greatly affect the corrosion kinetics evolution of zinc coating. Moreover, Zn5(OH)6(CO3)2 and Zn4(OH)6SO4 are identified as the main stable composition and exhibit an increasing relative amount; while Zn12(OH)15Cl3(SO4)3 cannot stably exist and diminish in the patina layer as the corrosion develops.
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Effect of tin addition on corrosion behavior of a low-alloy steel in simulated costal-Industrial Atmosphere
Journal of Materials Science & Technology, 2019Co-Authors: Bo Liu, Junhua Dong, Long Hao, Ying Yang, Xueyong Ding, Zhang Zhe, Huaxing HouAbstract:Abstract The effect of tin addition on the atmospheric corrosion behavior of a low-alloy steel in simulated coastal-Industrial Atmosphere has been investigated by indoor wet/dry cyclic corrosion test (CCT). The results indicate that tin addition can obviously make the steel substrate more resistant to atmospheric corrosion by suppressing the cathodic H+ reduction reaction, and but tin addition is not of obvious beneficial effect when the steel is covered with a thicker rust layer during long-term corrosion process. The reason lies in the fact that the presence of un-reduced H+ can lower the electrolyte pH value and lead to a loose and porous rust layer on tin-containing steel sample than that on tin-free steel sample. In addition, the 120 CCT cycles corrosion process of the two steels can be divided into three stages. Both the tin-free and tin-containing steels show an increasing corrosion rate during the initial corrosion stage and then exhibit a decreasing corrosion rate during the second and third corrosion stages. Moreover, tin addition makes the tin-containing steel rust layer have a higher amount of α-FeOOH and lower amount of γ-FeOOH and Fe3O4 than the tin-free steel rust layer.
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effect of sulphur dioxide on the corrosion of a low alloy steel in simulated coastal Industrial Atmosphere
Corrosion Science, 2014Co-Authors: Wenjuan Chen, Junhua Dong, Wei KeAbstract:Abstract This investigation aims to study the effect of SO 2 on the corrosion of a low alloy steel in simulated coastal Industrial Atmospheres. The results indicate that the corrosion weight gain of the steel firstly increases with increasing SO 2 content to a certain level and then decreases with further increasing the SO 2 content. Besides, higher SO 2 content promotes the formation of α-FeOOH and inhibits the formation of γ-FeOOH. Moreover, it seems that the deterioration effect of SO 2 to steel corrosion is not obvious in the initial corrosion stage and SO 2 begins to accelerate the steel corrosion as the corrosion process increases.
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PRICM: 8 Pacific Rim International Congress on Advanced Materials and Processing - Rusting Evolution and Anti-Corrosion Mechanism of MnCuP Weathering Steel in Simulated Atmospheres
Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 2013Co-Authors: Long Hao, Junhua DongAbstract:This paper summaries the corrosion resistance of a low-cost MnCuP weathering steel in simulated coastal, Industrial, and coastal-Industrial atmospheric environments submitted to wet/dry cyclic acceleration corrosion tests. The results indicate that MnCuP weathering steel exhibits ideal corrosion resistance, and a protective rust layer can be formed on the steel with increasing the corrosion cycles in the three environments. The corrosion rate during the initial corrosion process is much higher than it is during the subsequent process. The corrosion rate decreases and then maintains at a steady decreasing value with prolonging the exposure duration. Form echanism, Mn and Cu contribute to the ion-selectivity of the rust layer formed in the coastal Atmosphere. Cu and Pare responsible for the enhanced atmospheric corrosion resistance in the Industrial Atmosphere. The combined effects of Mn, Cu, and Pelements may be the key reason for the improved corrosion resistance of the steel in coastal-Industrial Atmosphere.
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Evolution of atmospheric corrosion of MnCuP weathering steel in a simulated coastal-Industrial Atmosphere
Corrosion Science, 2012Co-Authors: Long Hao, Sixun Zhang, Junhua DongAbstract:Abstract The evolution of atmospheric corrosion of MnCuP weathering steel in a simulated coastal-Industrial Atmosphere was investigated by weight gain, SEM, XRD, and electrochemical measurements. The results indicate that the corrosion kinetics divides into two stages with a higher corrosion rate in the first stage and a lower rate in the second stage. The increased amount of α-FeOOH indicates an improved resistance of the rust. The rust enhances initially and then stabilizes the cathodic process, but the anodic process tends to be inhibited. The EIS results indicate that the protective ability of the rust layer can be evaluated by the charge transfer resistance.
Christofer Leygraf - One of the best experts on this subject based on the ideXlab platform.
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the formation of zn4cl2 oh 4so4 5h2o in an urban and an Industrial Atmosphere
Corrosion Science, 1994Co-Authors: I. Odnevall, Christofer LeygrafAbstract:Abstract Phase identifications of a large number of field exposed sheltered zinc panels have revealed the presence of a number of different corrosion products on zinc. A few of these phases, Zn4SO4(OH)6 · nH2O, Zn5(OH)8Cl2 · H2O, NaZn4Cl(OH)6SO4 · 6H2O and Zn4Cl2(OH)4SO4 · 5H2O, seems to exist as final corrosion products. In order to study the formation of these phases, a field exposure program was implemented in Atmospheres yielding different end products. A multi-analytical approach was used for detailed studies from the initial stages to fully developed corrosion films. The present study aims at describing the formation of zinc chlorohydroxysulfate (Zn4Cl2(OH)4SO4 · 5H2O) appearing in urban and Industrial Atmospheres. It involves the consecutive formation of three phases, namely zinc hydroxycarbonate as the initial phase, zinc hydroxysulfate as the intermediate phase and zinc chlorohydroxysulfate as the final phase.
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The formation of Zn4Cl2(OH)4SO4 · 5H2O in an urban and an Industrial Atmosphere
Corrosion Science, 1994Co-Authors: I. Odnevall, Christofer LeygrafAbstract:Abstract Phase identifications of a large number of field exposed sheltered zinc panels have revealed the presence of a number of different corrosion products on zinc. A few of these phases, Zn4SO4(OH)6 · nH2O, Zn5(OH)8Cl2 · H2O, NaZn4Cl(OH)6SO4 · 6H2O and Zn4Cl2(OH)4SO4 · 5H2O, seems to exist as final corrosion products. In order to study the formation of these phases, a field exposure program was implemented in Atmospheres yielding different end products. A multi-analytical approach was used for detailed studies from the initial stages to fully developed corrosion films. The present study aims at describing the formation of zinc chlorohydroxysulfate (Zn4Cl2(OH)4SO4 · 5H2O) appearing in urban and Industrial Atmospheres. It involves the consecutive formation of three phases, namely zinc hydroxycarbonate as the initial phase, zinc hydroxysulfate as the intermediate phase and zinc chlorohydroxysulfate as the final phase.
Wei Ke - One of the best experts on this subject based on the ideXlab platform.
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effect of sulphur dioxide on the corrosion of a low alloy steel in simulated coastal Industrial Atmosphere
Corrosion Science, 2014Co-Authors: Wenjuan Chen, Junhua Dong, Wei KeAbstract:Abstract This investigation aims to study the effect of SO 2 on the corrosion of a low alloy steel in simulated coastal Industrial Atmospheres. The results indicate that the corrosion weight gain of the steel firstly increases with increasing SO 2 content to a certain level and then decreases with further increasing the SO 2 content. Besides, higher SO 2 content promotes the formation of α-FeOOH and inhibits the formation of γ-FeOOH. Moreover, it seems that the deterioration effect of SO 2 to steel corrosion is not obvious in the initial corrosion stage and SO 2 begins to accelerate the steel corrosion as the corrosion process increases.
Tadeja Kosec - One of the best experts on this subject based on the ideXlab platform.
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raman investigation of artificial patinas on recent bronze part i climatic chamber exposure
Journal of Raman Spectroscopy, 2012Co-Authors: Polonca Ropret, Tadeja KosecAbstract:In humid air, copper and its high copper alloys (bronze) tend to form an oxide layer (patina). Natural patinas protect copper and its alloys from further corrosion processes. On the other hand, artists have frequently deliberately patinated bronze for visual effects. Thus, it is of great importance to study the patina changing mechanism to follow its chemical changes and to predict in advance the likely corrosion processes. Green chloride and green nitrate patinas, applied over the brown artist's patina, were tested, and also brown patina and the patina that develops on bare bronze. The Raman spectra were studied after chemical patination, and after exposing the patina samples in a climatic chamber, which can produce an environment that resembles an Industrial Atmosphere, for 12 weeks. The structures of the patinas and of the corrosion products were characterized by scanning electron microscopy, Raman spectroscopy and X-ray diffraction. Cuprite and cuprous sulfite were found on the brown patina, atacamite on the green chloride patina, and a mixture of gerhardite and rouaite on the blue to green nitrate type patina. After 12 weeks of exposure to humidity, a controlled concentration of SO2, and salt spray mist, the corrosion products changed. In general, clinoatacamite and paratacamite are the end corrosion products, after an intermediate brochantite stage on the green chloride and green nitrate type patinas. The end products of each patina type are given. Copyright © 2012 John Wiley & Sons, Ltd.
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Raman investigation of artificial patinas on recent bronze – Part I: climatic chamber exposure
Journal of Raman Spectroscopy, 2012Co-Authors: Polonca Ropret, Tadeja KosecAbstract:In humid air, copper and its high copper alloys (bronze) tend to form an oxide layer (patina). Natural patinas protect copper and its alloys from further corrosion processes. On the other hand, artists have frequently deliberately patinated bronze for visual effects. Thus, it is of great importance to study the patina changing mechanism to follow its chemical changes and to predict in advance the likely corrosion processes. Green chloride and green nitrate patinas, applied over the brown artist's patina, were tested, and also brown patina and the patina that develops on bare bronze. The Raman spectra were studied after chemical patination, and after exposing the patina samples in a climatic chamber, which can produce an environment that resembles an Industrial Atmosphere, for 12 weeks. The structures of the patinas and of the corrosion products were characterized by scanning electron microscopy, Raman spectroscopy and X-ray diffraction. Cuprite and cuprous sulfite were found on the brown patina, atacamite on the green chloride patina, and a mixture of gerhardite and rouaite on the blue to green nitrate type patina. After 12 weeks of exposure to humidity, a controlled concentration of SO2, and salt spray mist, the corrosion products changed. In general, clinoatacamite and paratacamite are the end corrosion products, after an intermediate brochantite stage on the green chloride and green nitrate type patinas. The end products of each patina type are given. Copyright © 2012 John Wiley & Sons, Ltd.