Kinetics of nitrosation of aniline by N,O, in donor non-aqueous solvents, e.g. acetonitrile, ethylacetate and a 1 : 1 v/v mixture of both, have been studied. The reaction is first-order with respect to N,O, and zero-order with respect to aniline in each of the donor solvents added. The average observed order of kThe variation ofk values in the different solvents is interpreted in terms of solvation ability of the solvents. Conductivity measurements and U.V. studies of N,O, solutions are reported. Both the initial and integral rate methods show that the rate-determining step is the one which involves the formation of the nitrosating agent, NO+, from N,O,. Accordingly a mechanism of nitrosation is proposed.
Computational Fluid Dynamic (CFD) was used to simulate the injection molding process of a tray. The study focuses on pressure distribution and velocity drop during the injection process. CFD simulation software ANSYS FLUENT 14 was utilized in this study. The melt front pressure in the mold cavity shows that it was affected by the shape of mold cavity and filling stage. The melt front pressure will decrease as the flow move further than the sprue but it will increase rapidly when the mold was about to be fully filled. The slight pressure drop was detected when the molten flow meets the rib of the tray. The velocity of higher injection pressure was greater than the lower injection pressure but the velocity rapidly dropped when the melt front fully filled the cavity. The current predicted flow profile was validated by the experimental results, which demonstrates the excellent capability of the simulation tool in solving injection-molding problems.
The study intends to examine the corporate social responsibility and citizenship behavior in Dell. Dell Computer Corporation was established in 1984 by Michael Dell. Dell is an American multinational corporation that specializes in computer technology. Dell introduces the concepts of selling personal computer systems directly to customers, offers build-to-order computer systems, and provides direct, toll-free technical support and next-day, on-site service. Dell has many headquarters all over the world and one of them is in Malaysia. The paper also discusses how the corporate social responsibility bring an impact to their employees in terms of their citizenship behavior. The paper concludes with some implication and recommendation.
Effective learning can only occur in a healthy, vibrant and a democratic society, when there is humor in the process of teaching and learning. However, humor is often neglected and given less attention in the teaching and learning proves currently. Thus, this studywasconductedto identify the extend of thepractices of humor in teaching and learning by the Malay language teachers apart from identifying the type of humor that are often used these teachers, and the effect of these practiceson teachers and students.This study was conducted among the teachers and students of secondary schools in the Northern District Peninsular Malaysia through the utilization of questionnaires, interviews and observations. A total of 68 teachers ISSN 2162-6952 2011 www.macrothink.org/jse 2 responded to the questionnaire. Meanwhile four teachers were selected through "opportunity sampling" was observed and interviewed on a continuous basis. In addition to this, a total of 119 students from the classes that were taught by these four teachers selected through 'opportunity sampling' were involved in responding to the questionnaires. Hence the findings indicated that the Malay language teachers were alreadypracticing humor in their teaching and learning, but at a moderate level. However the type of humor that is often practiced consists of jokes, satire, funny comments, funny words, and cartoons. Concurrently, findings also indicates that the practice of humor can provide a positive impact on students, forge closer and friendlier relationship with teachers and reduce feelings of 'fear' between teachers and students as well as fostering positive values among students and the community. Furthermore, the results of interviews and observations also revealed that the ability of teachers to teach with humor helps them in reducing their emotional stress. In fact, teachers can build self-esteem, self-motivation and meet their commitments effectively. Journal of Studies in Education
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