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1 – 10 of 62Jan Wilkes, Yves‐Christian Hagedorn, Wilhelm Meiners and Konrad Wissenbach
The purpose this paper is to develop an additive manufacturing (AM) technique for high‐strength oxide ceramics. The process development aims at directly manufacturing fully dense…
Abstract
Purpose
The purpose this paper is to develop an additive manufacturing (AM) technique for high‐strength oxide ceramics. The process development aims at directly manufacturing fully dense ceramic freeform‐components with good mechanical properties.
Design/methodology/approach
The selective laser melting of the ceramic materials zirconia and alumina has been investigated experimentally. The approach followed up is to completely melt ZrO2/Al2O3 powder mixtures by a focused laser beam. In order to reduce thermally induced stresses, the ceramic is preheated to a temperature of at least 1,600°C during the build up process.
Findings
It is possible to manufacture ceramic objects with almost 100 percent density, without any sintering processes or any post‐processing. Crack‐free specimens have been manufactured that have a flexural strength of more than 500 MPa. Manufactured objects have a fine‐grained two‐phase microstructure consisting of tetragonal zirconia and alpha‐alumina.
Research limitations/implications
Future research may focus on improving the surface quality of manufactured components, solving issues related to the cold powder deposition on the preheated ceramic, further increasing the mechanical strength and transferring the technology from laboratory scale to industrial application.
Practical implications
Potential applications of this technique include manufacturing individual all‐ceramic dental restorations, ceramic prototypes and complex‐shaped ceramic components that cannot be made by any other manufacturing technique.
Originality/value
This new manufacturing technique based on melting and solidification of high‐performance ceramic material has some significant advantages compared to laser sintering techniques or other manufacturing techniques relying on solid‐state sintering processes.
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The Daily Telegraph has recently published several articles and a considerable amount of correspondence relating to malt whisky and the tricks of the whisky trade. As is usually…
Abstract
The Daily Telegraph has recently published several articles and a considerable amount of correspondence relating to malt whisky and the tricks of the whisky trade. As is usually the case when a daily newspaper takes up a subject of this kind, a number of well ‐ meaning people make a variety of suggestions as to what ought to be done to secure the purification of the particular Augean stable under discussion and to ensure the reception by the purchaser of the article which he really desires to have. But what ought to be done and what can be done are two very different things, and the question of what it is possible to do in the present state of scientific knowledge—and under the existing law as it is at present administered— is, as a rule, avoided by the writers referred to. It has been suggested, for instance, that it should be made compulsory that all vessels in which spirits are sold should bear a label distinctly stating the exact nature of the contents of such vessels. This would be an excellent suggestion if it could be effectively carried out, but, before this can be done, it is necessary to devise a method of compulsion. A man who sells as malt whisky an article mainly or entirely composed of spirit to which that title should not be applied would not have any very serious scruples as to the truth of the statements which appear on his labels. He must be compelled to act honestly by some sufficient force, and, short of a law which would permit the manufacture and “blending” of whisky to be carried out by certain persons only, according to specified rules, and under strict Government supervision in every case, no legislative enactments whatever would have the effect of preventing the various forms of this particular fraud. At present there are no legal definitions whereby the composition and characters of the articles described as “malt whisky” and “whisky” are laid down, excepting the definitions which may be held to be implied in the application of the 6th section of the Sale of Food and Drugs Act of 1875 to the case. This section requires that an article shall be of the “nature, substance, and quality demanded by the purchaser.” On the strength of this section it is quite unjustifiably assumed that the compulsion referred to can be effectively secured by the operation of the Sale of Food and Drugs Acts. According to our legal system it is essential under the criminal Acts— and the Food Adulteration Acts are criminal Acts—for the prosecuting authority to prove beyond all possibility of question that a person charged with an offence is guilty of that offence, and, in regard to the matter under consideration, it would therefore be necessary to absolutely prove by scientific evidence that any given mixed spirit, for the sale of which as malt whisky a prosecution had been instituted, was not of the nature, substance, and quality of the article demanded. Under the present conditions relating to sampling under the Acts this would be impracticable, except, possibly, on very broad lines; and, assuming that scientific investigation resulted in the possibility of fixing clear and definite points of distinction between the true and the false, there would still be the enormous difficulties and the heavy expenses attending the proving of offences of this character to the satisfaction of the Courts—difficulties and expenses which local authorities cannot fairly be expected to face. If, after the lengthy and expensive investigations that would be necessary, and which could only be properly carried out with Government aid, by a scientific Commission appointed by the Government, it were found possible to establish working definitions and standards, these would necessarily be only applicable to a limited extent, just as is at present the case in regard to milk and butter; while the question of quality can never be dealt with under repressive Acts of, Parliament of any kind. Assuming the establishment of standards of some kind we fully admit the possibility, under altered legal conditions, of checking the grosser forms of whisky sophistication by the employment of legal machinery, as is done with various other products; but vast amounts of various spirit mixtures could still be sold under false names with impunity. We should still have with us the legalised inferiority and the legalised adulteration of comparatively minor type which we have in the case of milk and butter. What is required and what alone can be effective, in dealing with sophistications which the law can never reach, is the provision of adequate and entirely independent guarantees which are based both on permanently‐applied analytical investigations carried out upon quantities of material which are not absurdly limited, and on a system of permanent and independent inspection,—both being supplied by some authority or authorities of sufficient standing. While the statements made by a reputable firm ought to carry weight, and ought, no doubt, to be accepted as valuable so far as they go, there is always necessarily and obviously a great element of weakness in the declarations put forward by a firm with respect to its own products. Particularly in view of modern commercial conditions something very much stronger than a personal asseveration as to the purity and excellence of one's own goods is now in reality required. That this is the case is shown by the fact that the demand for independent guarantees has recently been repeatedly voiced in the general press. The public are badly in want of education on all such questions and the Daily Telegraph is entitled to the thanks of the community for having initiated a discussion which can only be productive of good results in this direction.
Among the top management issues covered in this section are: leadership to promote change; issues of corporate culture; effective international strategy; environmental leadership;…
Abstract
Among the top management issues covered in this section are: leadership to promote change; issues of corporate culture; effective international strategy; environmental leadership; investment in Eastern Europe; and developing “world‐class” manufacturing strategy.
Casey L. Donoho, Michael J. Polonsky, Scott Roberts and David A. Cohen
Confirms the empirical test of Hunt and Vitell’s general theory of marketing ethics by Mayo and Marks across four cultures. Uses path analysis to show the core relationships of…
Abstract
Confirms the empirical test of Hunt and Vitell’s general theory of marketing ethics by Mayo and Marks across four cultures. Uses path analysis to show the core relationships of the general theory of marketing ethics were successfully replicated using over 1,500 students from seven universities in the USA, Canada, the Netherlands, and Australia. States that tomorrow’s managers appeared to use a more deontological approach to making ethical judgements about personal selling. Extends its original research by confirming the positive relationship between the probability and the desirability of consequences. Concludes that, although the model was originally intended to explain management ethical decision making, the study shows that it may be possible to generalize as to how individuals make ethical life decisions.
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In a communication to the Evening Standard, SIR JAMES CANTLIE observes that the new wave of influenza coincides with the break in the weather, and is of considerable virulence…
Abstract
In a communication to the Evening Standard, SIR JAMES CANTLIE observes that the new wave of influenza coincides with the break in the weather, and is of considerable virulence. The utmost personal precautions are necessary. The disease attacks the low‐toned and the worried people most quickly.
Abdullah- Al-Mamun, Ahasanul Haque and Muhammad Tahir Jan
The purpose of this study is to explore the variables that affect Muslim consumers’ perception towards tax rebate over zakat on income in Malaysia.
Abstract
Purpose
The purpose of this study is to explore the variables that affect Muslim consumers’ perception towards tax rebate over zakat on income in Malaysia.
Design/methodology/approach
A close-ended structured questionnaire was developed and a total number of 236 valid responses were collected through online survey from the Muslims residing in Malaysia.
Findings
This study found that halal-haram aspect of Islamic Shariah, legal consciousness and religiosity of Muslim consumers are positive significant factors for growing perceptions towards tax rebate over zakat on income in Malaysia.
Research limitations/implications
This study will definitely play an important leading role for the policy-makers and academicians in understanding the perceptions of Muslim consumers.
Practical implications
This study can assist zakat and tax authorities in Malaysia for taking corrective actions to adapt or improve the current policy on the basis of its Muslim consumers’ perception.
Social implications
The findings of this study can reduce the gap of understanding among Muslims in the society by letting other people’s perceptions towards tax rebate through zakat system in Malaysia.
Originality/value
As there are not enough studies in this area, this study will definitely play an important leading role for the countries or policy-makers or concerned zakat or tax institutions all over the world in capitalizing the practices which is highly and positively perceived by the Muslim consumers in Malaysia.
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Behnud Mir Djawadi, Sabrina Plaß and Sabrina Schäfers
When reporting wrongdoing internally, whistleblowers are confronted with the dilemma of weighing up their loyalty toward the organization (e.g., ethical standards) and their…
Abstract
When reporting wrongdoing internally, whistleblowers are confronted with the dilemma of weighing up their loyalty toward the organization (e.g., ethical standards) and their co-workers (e.g., the social norm of not snitching on peers). However, the role played by peers in the whistleblowing decision process and in the aftermath has rarely been addressed in existing reviews. We therefore perform a systematic review that identifies seven thematic clusters of peer factors, offering researchers an informative overview of (a) the peer factors that have been examined to influence the whistleblowing decision, and (b) the extent to which the whistleblower experiences adverse consequences from peers in the aftermath of whistleblowing. As peer factors seem to be important to explain and predict internal whistleblowing, researchers are encouraged to address in future works the research gaps our review unraveled.
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Jan G. Langhof and Stefan Güldenberg
This study aims to include two major objectives. Firstly, Frederick’s leadership is explored and characterized. Secondly, it is examined as to why a leader may (or may not) adopt…
Abstract
Purpose
This study aims to include two major objectives. Firstly, Frederick’s leadership is explored and characterized. Secondly, it is examined as to why a leader may (or may not) adopt servant leadership behavior in the case of Frederick II, King of Prussia.
Design/methodology/approach
The applied methodology is a historical examination of Frederick II’s leadership, an eighteenth-century’s monarch who has the reputation of being the “first servant of the state.” The analysis is conducted from the perspective of modern servant leadership research.
Findings
This study shows Frederick remains a rather non-transparent person of contradictions. The authors identified multiple reasons which explain why a leader may adopt servant leadership. Frederick’s motives to adopt a certain leadership behavior appear timeless and, thus, he most likely shares the same antecedents with today’s top executives.
Research limitations/implications
The authors identified various antecedents of individual servant leadership dimensions, an under-research area to date.
Originality/value
To the best of authors’ knowledge, this study is the first to look at Frederick's leadership style through the lens of modern servant leadership.
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KAMEL M. AL‐KHALIL, THEO G. JR. KEITH and KENNETH J. DE WITT
A numerical solution for ‘running wet’ aircraft anti‐icing systems is developed. The model includes breakup of the water film, which exists in regions of direct impingement, into…
Abstract
A numerical solution for ‘running wet’ aircraft anti‐icing systems is developed. The model includes breakup of the water film, which exists in regions of direct impingement, into individual rivulets. The wetness factor distribution resulting from the film breakup and rivulet configuration on the surface are predicted in the numerical solution procedure. The solid wall is modelled as a multi‐layer structure and the anti‐icing system used is of the thermal type utilizing hot air and/or electrical heating elements embedded within the layers. Details of the calculation procedure and the methods used are presented.
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