16,803 research outputs found

    Hubungan antara beban tugas dengan keresahan guru sekolah menengah teknik di Johor

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    Isu beban tugas mendapat perhatian yang meluas di Malaysia apabila ada guru-guru menghadapi keresahan atau keletihan emosi akibat dari beban tugas berlebihan. Oleh itu, kajian ini bertujuan untuk melihat hubungan antara beban tugas dengan keresahan guru sekolah yang mana beban tugas dan keresahan guru merupakan pemboleh ubah bersandar sementara latar belakang reponden adalah pemboleh ubah bebas. Kajian ini menggunakan instrumen terpiawai Maslach Burnout Inventory - Educators Survey (MBI-ES) (1966) yang telah diubahsuai bagi mengukur tahap keresahan guru. Keresahan ini berdasarkan tiga subskala MBI-ES iaitu keletihan emosi, gangguan keperibadian kendiri dan pencapaian peribadi. Soal selidik merupakan instrumen yang digunakan bagi mengenal pasti tahap beban tugas mengajar dan bukan mengajar serta keresahan yang dialami oleh guru di tujuh buah Sekolah Menengah Teknik di Johor. Seramai 277 orang guru telah menjadi responden iaitu SMT Kluang, SMT Kota Tinggi, SMT Muar, SMT Perdagangan Johor Bahru, SMT Pontian, SMT Segamat dan SMT Tanjung Puteri, Johor. Perisian Statistical Package for Social Science version 12 for Windows (SPSS v!2) digunakan bagi menganalisis data yang diperolehi. Min, kekerapan dan peratusan digunakan untuk menganalisis dapatan bagi kesemua item yang dibangunkan. Manakala ujian korelasi digunakan untuk melihat hubungan secara statistik antara beban tugas dengan tiga subskala keresahan. Dapatan kajian menunjukkan terdapat hubungan pada tahap yang sangat lemah antara beban tugas dengan subskala gangguan keperibadian kendiri. Manakala tidak terdapat hubungan antara beban tugas dengan subskala keletihan emosi dan pencapaian peribadi. Namun begitu, terdapat hubungan yang signifikan antara keletihan emosi dengan gangguan keperibadian kendiri pada tahap signifikan 0.01 iaitu nilai kekuatan korelasi ialah 0.610 manakala nilai signifikannya ialah 0.00. Di sini, terdapat hubungan yang sederhana antara dua pemboleh ubah tersebut. Cadangan juga telah diberikan bagi membantu menyelesaikan masalah beban tugas berlebihan yang terpaksa ditanggung oleh guru SMT

    Hierarchical cross-linking in physical alginate gels: a rheological and dynamic light scattering investigation

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    We investigate the dynamics of alginate gels, an important class of biopolymer-based viscoelastic materials, by combining mechanical tests and non-conventional, time-resolved light scattering methods. Two relaxation modes are observed upon applying a compressive or shear stress. Dynamic light scattering and diffusive wave spectroscopy measurements reveal that these modes are associated with discontinuous rearrangement events that restructure the gel network via anomalous, non-diffusive microscopic dynamics. We show that these dynamics are due to both thermal activation and internal stress stored during gelation and propose a scenario where a hierarchy of cross-links with different life times is responsible for the observed complex behavior. Measurements at various temperatures and sample ages are presented to support this scenario.Comment: To appear in Soft Matte

    Time reversal of ultrasound in granular media

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    Time reversal (TR) focusing of ultrasound in granular packings is experimentally investigated. Pulsed elastic waves transmitted from a compressional or shear transducer source are measured by a TR mirror, reversed in time and back-propagated. We find that TR of ballistic coherent waves onto the source position is very robust regardless driving amplitude but provides poor spatial resolution. By contrast, the multiply scattered coda waves offer a finer TR focusing at small amplitude by a lens effect. However, at large amplitude, these TR focusing signals decrease significantly due to the vibration-induced rearrangement of the contact networks, leading to the breakdown of TR invariance. Our observations reveal that granular acoustics is in between particle motion and wave propagation in terms of sensitivity to perturbations. These laboratory experiments are supported by numerical simulations of elastic wave propagation in disordered 2D percolation networks of masses and springs, and should be helpful for source location problems in natural processes.Comment: 15 pages, 6 figure

    Colour volumetric compression for realistic view synthesis applications

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    Using coupled micropillar compression and micro-Laue diffraction to investigate deformation mechanisms in a complex metallic alloy Al13Co4

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    In this investigation, we have used in-situ micro-Laue diffraction combined with micropillar compression of focused ion beam milled Al13Co4 complex metallic alloy to study the evolution of deformation in Al13Co4. Streaking of the Laue spots showed that the onset of plastic flow occured at stresses as low as 0.8 GPa, although macroscopic yield only becomes apparent at 2 GPa. The measured misorientations, obtained from peak splitting, enabled the geometrically necessary dislocation density to be estimated as 1.1 x 1013 m-2

    Antibaryons bound in nuclei

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    We study the possibility of producing a new kind of nuclear systems which in addition to ordinary nucleons contain a few antibaryons (B = p, , etc.). The properties of such systems are described within the relativistic mean field model by employing G parity transformed interactions for antibaryons. Calculations are first done for infinite systems and then for finite nuclei from 4He to 208Pb. It is demonstrated that the presence of a real antibaryon leads to a strong rearrangement of a target nucleus resulting in a significant increase of its binding energy and local compression. Noticeable e ects remain even after the antibaryon coupling constants are reduced by factor 3 4 compared to G parity motivated values. We have performed detailed calculations of the antibaryon annihilation rates in the nuclear environment by applying a kinetic approach. It is shown that due to significant reduction of the reaction Q values, the in medium annihilation rates should be strongly suppressed leading to relatively long lived antibaryon nucleus systems. Multi nucleon annihilation channels are analyzed too. We have also estimated formation probabilities of bound B + A systems in pA reactions and have found that their observation will be feasible at the future GSI antiproton facility. Several observable signatures are proposed. The possibility of producing multi quark antiquark clusters is discussed. PACS numbers: 25.43.+t, 21.10.-k, 21.30.Fe, 21.80.+
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