Flame retardancy and mechanical properties of poegmah compatibilized rice husk filled polypropylene composites

Flammability of Polypropylene, PP has restricted its usage as a versatile synthetic polymer. The addition of flame retardants will lower the flammability of PP. However, it will lower the mechanical properties. In this study, the flame retardancy of PP composite has been enhanced by the addition of intumescent flame retardant. Four formulations have been prepared, without flame retardant and with increasing concentration of flame retardant which are 20phr, 25phr and 30phr. The flammability of the composites has been measured using the Limiting Oxygen Index based on ASTM D2863. Two types of mechanical testing have been done to determine the mechanical properties, which are flexural test (ASTM D790) and impact test (ASTM D256). The thermal analysis has been done by thermogravimetry analysis (TGA) to determine the thermal stability of the composites prepared. Morphological study by scanning electron microscopy (SEM) has been done to study the filler distribution. Results obtained from the flammability test indicate that the addition of flame retardant has strongly improved the flame retardancy. The flexural strength and impact strength decreases as the concentration of flame retardant increases while the flexural modulus increases. The thermal analysis has proven that the composites with flame retardant have better thermal stability as compared to the composite without flame retardant. The morphological study has shown that the addition of flame retardant did not affect the filler distribution. The filler remain well distributed as the flame retardant introduced to the composites

Random fields, large deviations and triviality in quantum field theory. Part I

The issue of the existence and possible triviality of the Euclidean quantum scalar field in dimension 4 is investigated by using some large deviations techniques. As usual, the field $\phi^{4}$ is obtained as a limit of regularized fields $\phi_{k}^{4}$ associated with a probability measures $\mu_{k,V}$, where $k, V$ represent ultraviolet and volume cutoffs. The result obtained is that in a fixed volume, the almost sure limit (as $k \rightarrow \infty$) of the density of $\mu_{k,V}$, with respect to the Gaussian free field measure, exists and is equal to $0$, provided that the coupling constant sequence is not vanishing. This implies that $\mu_{k,V}$ can not have a strong limit as the ultraviolet cutoff is removed. Furthermore, the normalization sequence $Z_{k,V}= E e^{-{\cal L}_{k,V}}$ is divergent as $k \rightarrow \infty$ for dimension 4 or greater. This leads to the non ultraviolet stability of the scalar quantum field in dimension 4 and tends to question its possible existence. In other cases, in particular, when the coupling is vanishing with a sufficiently high speed the limiting field is trivial. These assertions are also valid for vector fields and can be extended to polynomial Lagrangians

Stochastic Hyperbolic Systems, Small Perturbations and Pathwise Approximation

This paper is devoted to the study of hyperbolic systems of linear partial differential equations perturbed by a Brownian motion. The existence and uniqueness of solutions are proved by an energy method. The specific features of this class of stochastic partial differential equations are highlighted and the comparison with standard existence results for SPDEs is discussed. The small perturbations problem is studied and a large deviation principle is stated. A pathwise approximation result, similar to the stochastic differential equations case, is established, with an application to a support theorem.Comment: 51 pages, LaTe

Pengaruh kecerdasan emosi terhadap kesediaan pelajar Sarjana Pendidikan Teknik dan Vokasional bagi menceburi profesion perguruan

Kesediaan bakal pendidik bagi menceburi profesion perguruan adalah amat penting bagi menjamin kualiti sistem pendidikan. Kesediaan ini adalah berkait rapat dengan kecerdasan emosi. Maka, kajian perlu dilakukan untuk melihat pengaruh kecerdasan emosi terhadap kesediaan bakal pendidik. Faktor yang dikaji adalah lima domain kecerdasan emosi Goleman (1998) iaitu kesedaran kendiri, kawalan kendiri, motivasi, empati dan kemahiran sosial, manakala kesediaan dilihat dari aspek sikap dan penguasaan kemahiran. Responden dalam kajian ini adalah 108 pelajar semester akhir, Sarjana Pendidikan Teknik dan Vokasional, Fakulti Pendidikan Teknikal dan Vokasional, Universiti Tun Hussein Onn Malaysia (UTHM). Instrumen yang digunakan adalah soal selidik kecerdasan emosi dan kesediaan guru. Data kajian ini dianalisis menggunakan perisian Statistical Package for Social Sciences (SPSS) versi 16.0 melibatkan statistik deskriptif dan analisis inferensi. Dapatan kajian menunjukkan bahawa tahap penguasaan kecerdasan emosi dan kesediaan di kalangan bakal pendidik adalah tinggi. Terdapat hubungan sederhana kuat antara kecerdasan emosi dan kesediaan bakal pendidik. Ujian regresi pelbagai menunjukkan hanya dua domain kecerdasan emosi iaitu kemahiran sosial dan motivasi yang mempengaruhi kesediaan bakal pendidik dari aspek sikap. Manakala, domain kecerdasan emosi yang mempengaruhi kesediaan penguasaan kemahiran ialah kemahiran sosial, motivasi dan empati. Kajian ini diharapkan dapat memberi sumbangan dalam penambahbaikan kursus latihan perguruan di Fakulti Pendidikan Teknikal dan Vokasional, Universiti Tun Hussein Onn Malaysia (UTHM) khususnya, dan institusi pendidikan lain amnya