The Experts below are selected from a list of 2223 Experts worldwide ranked by ideXlab platform
Salvatore Iannace - One of the best experts on this subject based on the ideXlab platform.
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the effects of different starch sources and plasticizers on film Blowing of thermoplastic starch correlation among Process elongational properties and macromolecular structure
Carbohydrate Polymers, 2009Co-Authors: R. Zullo, Salvatore IannaceAbstract:Abstract The material compositions and the technological procedures to prepare biodegradable films with the film Blowing technology based on thermoplastic starch were studied in this work. The activities were focused on the analysis of the effects of starch source (maize, potato and wheat), supplier (Roquette, Cerestar and Cameo) and the type of plasticizers (glycerol, urea and formamide) and their content on the physical–chemical and mechanical properties. Moreover, in order to develop a film Blowing technology, material composition as well as Processing condition were optimized. Among 10 varieties of thermoplastic starch prepared, the combination of urea and formamide as plasticizer restrained retrogradation and improved mechanical properties. Extensional rheological properties of the thermoplastic starch films were also investigated: the results showed that the occurrence of strain-hardening behaviour in some of the investigated compositions lead to a positive effect on the film Blowing Process. In this study we found that the combination of high-amylose (>51%) starch and urea/formamide mixtures as plasticizer produced an homogenous film of a 50 μm thickness and a robust film Blowing Process due to the good elongational viscosity, high deformability of the melt and strain-hardening behaviour.
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The effects of different starch sources and plasticizers on film Blowing of thermoplastic starch: Correlation among Process, elongational properties and macromolecular structure
Carbohydrate Polymers, 2009Co-Authors: R. Zullo, Salvatore IannaceAbstract:The material compositions and the technological procedures to prepare biodegradable films with the film Blowing technology based on thermoplastic starch were studied in this work. The activities were focused on the analysis of the effects of starch source (maize, potato and wheat), supplier (Roquette, Cerestar and Cameo) and the type of plasticizers (glycerol, urea and formamide) and their content on the physical-chemical and mechanical properties. Moreover, in order to develop a film Blowing technology, material composition as well as Processing condition were optimized. Among 10 varieties of thermoplastic starch prepared, the combination of urea and formamide as plasticizer restrained retrogradation and improved mechanical properties. Extensional rheological properties of the thermoplastic starch films were also investigated: the results showed that the occurrence of strain-hardening behaviour in some of the investigated compositions lead to a positive effect on the film Blowing Process. In this study we found that the combination of high-amylose (>51%) starch and urea/formamide mixtures as plasticizer produced an homogenous film of a 50 μm thickness and a robust film Blowing Process due to the good elongational viscosity, high deformability of the melt and strain-hardening behaviour. © 2009 Elsevier Ltd. All rights reserved.
Marcia P. Miceli - One of the best experts on this subject based on the ideXlab platform.
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Organizational dissidence: The case of whistle-Blowing
Citation Classics from The Journal of Business Ethics: Celebrating the First Thirty Years of Publication, 2013Co-Authors: Janet P. Near, Marcia P. MiceliAbstract:Research on whistle-Blowing has been hampered by a lack of a sound theoretical base. In this paper, we draw upon existing theories of motivation and power relationships to propose a model of the whistle-Blowing Process. This model focuses on decisions made by organization members who believe they have evidence of organizational wrongdoing, and the reactions of organization authorities. Based on a review of the sparse empirical literature, we suggest variables that may affect both the members’ decisions and the organization’s responses.
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does type of wrongdoing affect the whistle Blowing Process
Business Ethics Quarterly, 2004Co-Authors: Janet P. Near, James R Van Scotter, Michael T Rehg, Marcia P. MiceliAbstract:We analyzed data from a survey of employees of a large military base in order to assess possible differences in the whistle-Blowing Process due to type of wrongdoing observed. Employees who observed perceived wrongdoing involving mismanagement, sexual harassment, or unspecified legal violations were significantly more likely to report it than were employees who observed stealing, waste, safety problems, or discrimination. Further, type of wrongdoing was significantly related to reasons given by employees who observed wrongdoing but did not report it, across all forms of wrongdoing. However, the primary reason that observers did not report it was that they thought nothing could be done to rectify the situation. Finally, type of wrongdoing was significantly related to the cost of the wrongdoing, the quality of the evidence about the wrongdoing, and the comprehensiveness of retaliation against the whistle-blower. These findings suggest that type of wrongdoing makes a difference in the whistle-Blowing Process, and it should be examined in future research.
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Does Type of Wrongdoing Affect the Whistle-Blowing Process ?
Business Ethics Quarterly, 2004Co-Authors: Janet P. Near, James R Van Scotter, Michael T Rehg, Marcia P. MiceliAbstract:t: We analyzed data from a survey of employees of a large mili- tary base in order to assess possible differences in the whistlewBlowing Process due to type of wrongdoing observed. Employees who observed perceived wrongdoing involving mismanagement, sexual harassment, or unspecified legal violations were significantly more likely to report it than were employees who observed stealingw wastel safety probS lems, or discrimination. Furtherl type of wrongdoing was significantly related to reasons given by employees who observed wrongdoing but did not report itl across all forms of wrongdoing. Howeverl the primary reason that observers did not report it was that they thought nothing could be done to rectify the situation. Finally, type of wrongdoing was significantly related to the cost of the wrongdoing, the quality of the evidence about the wrongdoing, and the comprehensiveness of retaliw ation against the whistle-blower. These findings suggest that type of wrongdoing makes a difference in the whistle-Blowing Process, and it should be examined in future research. Time
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Explaining the Whistle-Blowing Process: Suggestions from Power Theory and Justice Theory
Organization Science, 1993Co-Authors: Janet P. Near, Terry Morehead Dworkin, Marcia P. MiceliAbstract:Review of research concerning whistle-Blowing suggests that legal sanctions have been singularly unsuccessful in encouraging whistle-Blowing but that legalistic responses by organi- zations seem to have been somewhat more successful. Below, we review three sets of studies that illustrate this point. The first set includes federal employees, both before and after a legal change intended to encourage whistle-Blowing. The second study examines the effects of state laws, by comparing states with whistle-Blowing statutes to those without such statutes. The third study focuses on whistle-blowers who are role prescribed and therefore have legalistic protections but not legal protections. Results from these three sets of studies suggest that legal procedures seem not to be effective in encouraging positive organizational responses to whistle-Blowing, but legalistic responses designed by the organizations them- selves have more positive effects both for the whistle-blowers and for the organizations themselves. We attempt to resolve this apparent paradox by considering two theoretical frameworks, power relations and justice theory, and using these frameworks to predict the behaviors of both whistle-blowers and their organizations when legal mechanisms are involved and when legalistic mechanisms are used. Finally, drawing on the implications of our theoretical analysis, we provide policy suggestions for the encouragement of legalistic mechanisms, in addition to legal mechanisms, to persuade organizations to respond positively to whistle-blowers.
R. Zullo - One of the best experts on this subject based on the ideXlab platform.
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the effects of different starch sources and plasticizers on film Blowing of thermoplastic starch correlation among Process elongational properties and macromolecular structure
Carbohydrate Polymers, 2009Co-Authors: R. Zullo, Salvatore IannaceAbstract:Abstract The material compositions and the technological procedures to prepare biodegradable films with the film Blowing technology based on thermoplastic starch were studied in this work. The activities were focused on the analysis of the effects of starch source (maize, potato and wheat), supplier (Roquette, Cerestar and Cameo) and the type of plasticizers (glycerol, urea and formamide) and their content on the physical–chemical and mechanical properties. Moreover, in order to develop a film Blowing technology, material composition as well as Processing condition were optimized. Among 10 varieties of thermoplastic starch prepared, the combination of urea and formamide as plasticizer restrained retrogradation and improved mechanical properties. Extensional rheological properties of the thermoplastic starch films were also investigated: the results showed that the occurrence of strain-hardening behaviour in some of the investigated compositions lead to a positive effect on the film Blowing Process. In this study we found that the combination of high-amylose (>51%) starch and urea/formamide mixtures as plasticizer produced an homogenous film of a 50 μm thickness and a robust film Blowing Process due to the good elongational viscosity, high deformability of the melt and strain-hardening behaviour.
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The effects of different starch sources and plasticizers on film Blowing of thermoplastic starch: Correlation among Process, elongational properties and macromolecular structure
Carbohydrate Polymers, 2009Co-Authors: R. Zullo, Salvatore IannaceAbstract:The material compositions and the technological procedures to prepare biodegradable films with the film Blowing technology based on thermoplastic starch were studied in this work. The activities were focused on the analysis of the effects of starch source (maize, potato and wheat), supplier (Roquette, Cerestar and Cameo) and the type of plasticizers (glycerol, urea and formamide) and their content on the physical-chemical and mechanical properties. Moreover, in order to develop a film Blowing technology, material composition as well as Processing condition were optimized. Among 10 varieties of thermoplastic starch prepared, the combination of urea and formamide as plasticizer restrained retrogradation and improved mechanical properties. Extensional rheological properties of the thermoplastic starch films were also investigated: the results showed that the occurrence of strain-hardening behaviour in some of the investigated compositions lead to a positive effect on the film Blowing Process. In this study we found that the combination of high-amylose (>51%) starch and urea/formamide mixtures as plasticizer produced an homogenous film of a 50 μm thickness and a robust film Blowing Process due to the good elongational viscosity, high deformability of the melt and strain-hardening behaviour. © 2009 Elsevier Ltd. All rights reserved.
Janet P. Near - One of the best experts on this subject based on the ideXlab platform.
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Organizational dissidence: The case of whistle-Blowing
Citation Classics from The Journal of Business Ethics: Celebrating the First Thirty Years of Publication, 2013Co-Authors: Janet P. Near, Marcia P. MiceliAbstract:Research on whistle-Blowing has been hampered by a lack of a sound theoretical base. In this paper, we draw upon existing theories of motivation and power relationships to propose a model of the whistle-Blowing Process. This model focuses on decisions made by organization members who believe they have evidence of organizational wrongdoing, and the reactions of organization authorities. Based on a review of the sparse empirical literature, we suggest variables that may affect both the members’ decisions and the organization’s responses.
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does type of wrongdoing affect the whistle Blowing Process
Business Ethics Quarterly, 2004Co-Authors: Janet P. Near, James R Van Scotter, Michael T Rehg, Marcia P. MiceliAbstract:We analyzed data from a survey of employees of a large military base in order to assess possible differences in the whistle-Blowing Process due to type of wrongdoing observed. Employees who observed perceived wrongdoing involving mismanagement, sexual harassment, or unspecified legal violations were significantly more likely to report it than were employees who observed stealing, waste, safety problems, or discrimination. Further, type of wrongdoing was significantly related to reasons given by employees who observed wrongdoing but did not report it, across all forms of wrongdoing. However, the primary reason that observers did not report it was that they thought nothing could be done to rectify the situation. Finally, type of wrongdoing was significantly related to the cost of the wrongdoing, the quality of the evidence about the wrongdoing, and the comprehensiveness of retaliation against the whistle-blower. These findings suggest that type of wrongdoing makes a difference in the whistle-Blowing Process, and it should be examined in future research.
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Does Type of Wrongdoing Affect the Whistle-Blowing Process ?
Business Ethics Quarterly, 2004Co-Authors: Janet P. Near, James R Van Scotter, Michael T Rehg, Marcia P. MiceliAbstract:t: We analyzed data from a survey of employees of a large mili- tary base in order to assess possible differences in the whistlewBlowing Process due to type of wrongdoing observed. Employees who observed perceived wrongdoing involving mismanagement, sexual harassment, or unspecified legal violations were significantly more likely to report it than were employees who observed stealingw wastel safety probS lems, or discrimination. Furtherl type of wrongdoing was significantly related to reasons given by employees who observed wrongdoing but did not report itl across all forms of wrongdoing. Howeverl the primary reason that observers did not report it was that they thought nothing could be done to rectify the situation. Finally, type of wrongdoing was significantly related to the cost of the wrongdoing, the quality of the evidence about the wrongdoing, and the comprehensiveness of retaliw ation against the whistle-blower. These findings suggest that type of wrongdoing makes a difference in the whistle-Blowing Process, and it should be examined in future research. Time
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Explaining the Whistle-Blowing Process: Suggestions from Power Theory and Justice Theory
Organization Science, 1993Co-Authors: Janet P. Near, Terry Morehead Dworkin, Marcia P. MiceliAbstract:Review of research concerning whistle-Blowing suggests that legal sanctions have been singularly unsuccessful in encouraging whistle-Blowing but that legalistic responses by organi- zations seem to have been somewhat more successful. Below, we review three sets of studies that illustrate this point. The first set includes federal employees, both before and after a legal change intended to encourage whistle-Blowing. The second study examines the effects of state laws, by comparing states with whistle-Blowing statutes to those without such statutes. The third study focuses on whistle-blowers who are role prescribed and therefore have legalistic protections but not legal protections. Results from these three sets of studies suggest that legal procedures seem not to be effective in encouraging positive organizational responses to whistle-Blowing, but legalistic responses designed by the organizations them- selves have more positive effects both for the whistle-blowers and for the organizations themselves. We attempt to resolve this apparent paradox by considering two theoretical frameworks, power relations and justice theory, and using these frameworks to predict the behaviors of both whistle-blowers and their organizations when legal mechanisms are involved and when legalistic mechanisms are used. Finally, drawing on the implications of our theoretical analysis, we provide policy suggestions for the encouragement of legalistic mechanisms, in addition to legal mechanisms, to persuade organizations to respond positively to whistle-blowers.
Yongchun Zeng - One of the best experts on this subject based on the ideXlab platform.
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Simulation of jet velocity in the melt-Blowing Process using the coupled air–polymer model:
Textile Research Journal, 2018Co-Authors: Hui Huang, Yongchun ZengAbstract:The polymer jet velocity is one of the most basic and critical factors in the melt-Blowing Process and has always been difficult to measure online. Much effort has been made on the numerical predic...
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Influence of Die Geometry on Fiber Motion and Fiber Attenuation in the Melt-Blowing Process
Industrial & Engineering Chemistry Research, 2014Co-Authors: Yuansheng Zheng, Yongchun ZengAbstract:Melt Blowing is a technology for producing microfibrous nonwovens. The melt-Blowing die is the key component of the melt-Blowing device. In this study, a slot die and a swirl die were used to study the effects of die geometry on fiber motion and fiber attenuation in the melt-Blowing Process. The fiber paths in these two melt-Blowing Processes were recorded dynamically with a high-speed camera at a shutter speed of 3000 frames per second. The fiber path profiles, especially the whipping behavior, were for the first time obtained and presented. The recorded images were further Processed to interpret the law of fiber motion and to determine the fiber velocity. A mathematical method was also constructed to qualify the fiber diameters instantly below the two dies, which are undetectable upon experimental measurement. The results show that fiber whipping in the slot-die melt-Blowing Process is a two-dimensional motion. In contrast, it appears as a spiral path in three dimensions in the swirl-die melt-Blowing pr...
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Fiber spiral motion in a swirl die melt-Blowing Process
Fibers and Polymers, 2014Co-Authors: Yongchun ZengAbstract:Melt Blowing is a major Process for producing nanofibrous nonwovens. Compared to another technology for producing nanofibrous nonwovens, electrospinning, melt Blowing applies high-speed air flow field to attenuate the extruded polymer jet. It is known that the essential electrospinning mechanism is a rapidly whipping jet in an electric field. While there are few studies on the fiber whipping in the melt-Blowing Process. In this study, a high-speed camera was used to capture the fiber path below a single-orifice melt-Blowing swirl die. The spiral path of the fiber was revealed. The characteristics of the whipping amplitude, whipping frequency, and the fiber velocity were obtained. Fiber diameter reduction ratio contributed by the spiral path was calculated by establishing a mathematical model. The study indicates that spiral path of the whipping plays an important role in fiber attenuation near the die.
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The Effect of Air Pressure on the Evolution of Fiber Path in Melt-Blowing Process
Advanced Materials Research, 2014Co-Authors: Yongchun ZengAbstract:Melt Blowing is an important method for producing ultrafine fibers. In melt Blowing Process, compared to the studies on the fiber path at a certain air pressure condition, much less has been done on searching the evolution of the fiber paths at different air pressures. In this study, a high-speed camera was used to capture the fiber paths below a slot die and a swirl die in the melt-Blowing Process. The evolution of the fiber paths was captured. This paper first shows the evolution of the fiber paths at different air pressures, which is useful to further understand the attenuation effect on the fiber in the melt-Blowing Process.
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Air Flow Field and Fiber Motion in a Swirl Die Melt-Blowing Process
Advanced Materials Research, 2013Co-Authors: Yuansheng Zheng, Yongchun ZengAbstract:Melt Blowing is an important Process for producing nanofibrous nonwovens. Compared to another technology for producing nanofibrous nonwovens, electrospinning, melt Blowing applies high-speed air flow field to attenuate the extruded polymer jet. In this study, the air flow field of a swirl die melt-Blowing Process was simulated by CFD software, Fluent 6.3. The swirling air profile was shown. Meanwhile, a high-speed camera was used to capture the fiber path below a single-orifice melt-Blowing swirl die. The spiral motion of the fiber was revealed. The relationship between the fiber path and the air flow field was discussed. This paper shows the relationship between the fiber path and the air flow field in a swirl die melt-Blowing Process.
