Search results
1 – 7 of 7Petr Slobodian, Pavel Riha, Robert Olejnik and Jiri Matyas
The synergistic effect of functionalization of multi-walled carbon nanotubes (CNT) using KMnO4 oxidation and initial tensile deformation on the electrical resistance of…
Abstract
Purpose
The synergistic effect of functionalization of multi-walled carbon nanotubes (CNT) using KMnO4 oxidation and initial tensile deformation on the electrical resistance of nanotube network/polyurethane composite subjected to elongation was studied.
Design/methodology/approach
Though the initial deformation irreversibly changed the arrangement of carbon nanotube network, subsequent cyclic elongation confirmed stable resistance values. The increased strain-dependent resistance of stimulated nanotube network/polyurethane composite was demonstrated by monitoring vibration of tambour leather after a bead impact and finger flexion.
Findings
The results showed a tenfold composite resistance increase for the composite prepared from KMnO4 oxidized nanotubes, quantified by a so-called gauge factor, from a value of about 20 in comparison to the network prepared from pristine nanotubes. This is a substantial increase, which ranks the stimulated composite among materials with the highest electromechanical response.
Originality/value
The results in this paper are new and have not been published yet. The paper combines different ideas which are developed together. It presents a new concept of synergistic effect of CNT oxidation and application of pre-strain simulation. Oxidation and pre-strain increases by several times the sensitivity of the tested composites which are predetermined for use as strain sensors of various sizes and shapes.
Details
Keywords
Robert Rogólski and Aleksander Olejnik
The finite element model developed for a new-designed aircraft was used to solve some problems of structural dynamics. The key purpose of the task was to estimate the…
Abstract
Purpose
The finite element model developed for a new-designed aircraft was used to solve some problems of structural dynamics. The key purpose of the task was to estimate the critical flutter velocities of the light airplane by performing numerical analysis with application of MSC Software.
Design/methodology/approach
Flutter analyses processed by Nastran require application of some complex aeroelastic model integrating two separate components – structural model and aerodynamic model. These sub-models are necessary for determining stiffness, mass and aerodynamic matrices, which are involved in the flutter equation. The aircraft structural model with its non-structural masses was developed in Patran. To determine the aerodynamic coefficient matrix, some simplified aerodynamic body-panel geometries were developed. The flutter equation was solved with the PK method.
Findings
The verified aircraft model was used to determine its normal modes in the range of 0-30 Hz. Then, some critical velocities of flutter were calculated within the range of operational velocities. As there is no certainty that the computed modes are in accordance with the natural ones, some parametric calculations are recommended. Modal frequencies depend on structural parameters that are quite difficult to identify. Adopting their values from the reasonable range, it is possible to assign the range of possible frequencies. The frequencies of rudder or elevator modes are dependent on their mass moments of inertia and rigidity of controls. The critical speeds of tail flutter were calculated for various combinations of stiffness or mass values.
Practical implications
The task described here is a preliminary calculational study of normal modes and flutter vibrations. It is necessary to prove the new airplane is free from flutter to fulfil the requirement considered in the type certification process.
Originality/value
The described approach takes into account the uncertainty of results caused by the indeterminacy of selected constructional parameters.
Details
Keywords
Olli Kuivalainen, Sanna Sundqvist, Sami Saarenketo and Rod McNaughton
The purpose of this paper is to present an overview of the conceptual frameworks and concepts with which the research on internationalization patterns of small and…
Abstract
Purpose
The purpose of this paper is to present an overview of the conceptual frameworks and concepts with which the research on internationalization patterns of small and medium‐sized enterprises (SMEs) should be conducted.
Design/methodology/approach
A comprehensive overview of concepts and a conceptual framework to study internationalization patterns of SMEs is offered.
Findings
The complexities of existing definitions and methodologies for researching internationalization patterns are highlighted, and a synthesis of the issues is provided. An integrative model of internationalization pathways, and their antecedents and outcomes is presented.
Research limitations/implications
It is recommended that future research focuses especially on the time dimension of internationalization patterns. Future research can contribute to the literature by adopting a longitudinal approach with larger samples and more detailed cases to capture the dynamics of internationalization.
Practical implications
Practitioners might map their positions, and look for challenges and opportunities with regard to their chosen internationalization pattern. They can also benchmark other firms’ pathways and fine‐tune their own approach to internationalization.
Originality/value
The paper integrates a large body of research in an important research area in international marketing. It also provides guidance on how to conduct future research in the area, and introduces the content of this special issue of the International Marketing Review.
Details
Keywords
Robert Balich, Jane Warren, Jennifer Weatherford, Noor Syamilah Zakaria and Diana Schwede
The purpose of this paper is to examine the effects of education and experiential learning on counseling student’s perceptions of substance use and counseling those with…
Abstract
Purpose
The purpose of this paper is to examine the effects of education and experiential learning on counseling student’s perceptions of substance use and counseling those with substance-related problems. Some counselors report having had negative experiences and beliefs about substance use, abuse, and persons with substance related-problems. A counselor’s negative beliefs and experiences can impair their capacities of working effectively and empathetically with persons who seek help for substance abuse problems. Research reports that education can assist helping professionals to be able to work more efficiently with clients with substance abuse struggles by increasing awareness of substance abuse problems, enhancing empathy, increasing professional’s ability to relate with what clients may be experiencing, training in appropriate interventions, and referral skills.
Design/methodology/approach
This study measured changes in students’ attitudes toward addictions following completion of a 15-week addictions counseling course, which incorporated multiple experiential activities in conjunction with information about the effects of various substances and different treatment modalities.
Findings
The results revealed significant changes in treatment intervention and non-stereotyping.
Originality/value
These changes suggest education might affect attitudes toward substance abuse. The implications of this study can guide counselor educators in designing effective addictions courses and can lead to future discussions on how to use experiential learning in the classroom.
Details
Keywords
Przemysław Sadura and Dorota Olko
The city as a form of spatial and social organization was in deep crisis for last years. Now in Poland we deal rather with the renaissance of urbanity. Increasing activity…
Abstract
The city as a form of spatial and social organization was in deep crisis for last years. Now in Poland we deal rather with the renaissance of urbanity. Increasing activity of social movements and the growing importance of civic participation are the most important evidence of this process. This chapter is about the role that public consultation on spatial planning can play in urban policy. The analysis is based on a case study of public consultations conducted with usage of active and innovative approaches. Authors describe the potential of such sociological intervention in solving the crisis of urban communities.
Details
Keywords
To provide a selective bibliography for researchers working with bulk material forming (specifically the forging, rolling, extrusion and drawing processes) with sources…
Abstract
Purpose
To provide a selective bibliography for researchers working with bulk material forming (specifically the forging, rolling, extrusion and drawing processes) with sources which can help them to be up‐to‐date.
Design/methodology/approach
A range of published (1996‐2005) works, which aims to provide theoretical as well as practical information on the material processing namely bulk material forming. Bulk deformation processes used in practice change the shape of the workpiece by plastic deformations under forces applied by tools and dies.
Findings
Provides information about each source, indicating what can be found there. Listed references contain journal papers, conference proceedings and theses/dissertations on the subject.
Research limitations/implications
It is an exhaustive list of papers (1,693 references are listed) but some papers may be omitted. The emphasis is to present papers written in English language. Sheet material forming processes are not included.
Practical implications
A very useful source of information for theoretical and practical researchers in computational material forming as well as in academia or for those who have recently obtained a position in this field.
Originality/value
There are not many bibliographies published in this field of engineering. This paper offers help to experts and individuals interested in computational analyses and simulations of material forming processes.
Details
Keywords
Increased evidence for the health benefits of probiotics for health restoration coupled with the consumer's inclination towards a safe, natural and cost-effective…
Abstract
Purpose
Increased evidence for the health benefits of probiotics for health restoration coupled with the consumer's inclination towards a safe, natural and cost-effective substitute for drugs have led application of probiotics as a pharmaceutical agent and are rapidly moving in clinical usage. In this context, this article attempts to highlight the potential of probiotics as a pharmaceutical agent.
Design/methodology/approach
Endeavor has been made to explore the significance of probiotics for the modulation of gut ecology and their action. Potentiality of probiotics for their exploitation as a pharmaceutical agent has also been justified. Limitations of probiotic therapy and the various considerations for probiotic therapy have also been delineated.
Findings
Probiotic organisms influence the physiological and pathological process of the host by modifying the intestinal microbiota, thereby affecting human health. Beneficial effects of probiotics as a pharmaceutical agent seem to be strain and dose dependent and more efficacious with their early introduction. Combination of various probiotics proved to be more efficacious than single strain for exhibiting prophylactic activities.
Research limitations/implications
Reviewed literature indicated that it is difficult to generalize for the beneficial effect of all probiotics for all types of diseases as efficacy of probiotics is strain-dependent and dose-dependent and its clinical application needs long-term investigations.
Practical implications
Clinical trials have displayed that probiotics may alleviate certain disorders or diseases in humans especially those related to gastro-intestinal tract.
Originality/value
Ingestion of fermented dairy products containing probiotic cultures may provide health benefits in certain clinical conditions such as antibiotic-associated diarrhoea, rotavirus-associated diarrhoea, inflammatory bowel disease, inflammatory bowel syndrome, allergenic diseases, cancer, Helicobacter pylori infection and lactose-intolerance. Application of probiotics as a pharmaceutical agent is recommended.
Details