5,574 research outputs found
PERLAKSANAAN DAN KEBERKESANAN KAEDAH LATTICE DALAM PENGAJARAN KEMAHIRAN MATEMATIK: SATU KAJIAN KES DI SEKOLAH RENDAH
Dalam pendidikan matematik, penguasaan pendaraban nombor merupakan salah satu kemahiran penting untuk matapelajaran matematik di sekolah rendah. Seandainya murid-murid tidak dapat menguasai kemahiran ini pada peringkat awal pembelajaran matematik, mereka bakal menghadapi pelbagai masalah dan cabaran dalam penguasaan kemahiran seterusnya yang memerlukan kemahiran pendaraban sebagai asas. Oleh yang demikian, satu kajian telah dijalankan untuk menilai sejauh manakah keberkesanan perlaksanaan kaedah Lattice dalam membantu meningkatkan kemahiran asas pendaraban, yang melibatkan pendaraban nombor dua dan tiga digit. Rekabentuk kajian yang digunakan ialah kajian kuasi-experimental yang melibatkan sampel murid sebanyak 15 orang murid darjah empat di Sekolah Jenis Kebangsaan Cina Chung Cheng, Batu Pahat, Johor. Ujian Pra dan Pos telah dilakukan bagi membandingkan tahap pencapaian sampel kajian sebelum dan selepas rawatan menerusi empat sesi intervensi. Secara keseluruhannya, hasil kajian telah mendapati peningkatan purata skor sebanyak 42.67 peratus selepas rawatan dengan penggunaan kaedah Lattice. Kesimpulannya, kaedah Lattice merupakan kaedah yang berkesan dalam meningkatkan pemahaman dan kemahiran responden dalam topik pendaraban
Rabi oscillations of a qubit coupled to a two-level system
The problem of Rabi oscillations in a qubit coupled to a fluctuator and in
contact with a heath bath is considered. A scheme is developed for taking into
account both phase and energy relaxation in a phenomenological way, while
taking full account of the quantum dynamics of the four-level system subject to
a driving AC field. Significant suppression of the Rabi oscillations is found
when the qubit and fluctuator are close to resonance. The effect of the
fluctuator state on the read-out signal is discussed. This effect is shown to
modify the observed signal significantly. This may be relevant to recent
experiments by Simmonds et al. [Phys. Rev. Lett. 93, 077003 (2004)].Comment: 4 pages, 4 figure
The Band-Gap Problem in Semiconductors Revisited: Effects of Core States and Many-Body Self-Consistency
A novel picture of the quasiparticle (QP) gap in prototype semiconductors Si
and Ge emerges from an analysis based on all-electron, self-consistent, GW
calculations. The deep-core electrons are shown to play a key role via the
exchange diagram --if this effect is neglected, Si becomes a semimetal.
Contrary to current lore, the Ge 3d semicore states (e.g., their polarization)
have no impact on the GW gap. Self-consistency improves the calculated gaps --a
first clear-cut success story for the Baym-Kadanoff method in the study of
real-materials spectroscopy; it also has a significant impact on the QP
lifetimes. Our results embody a new paradigm for ab initio QP theory
Origin of broad luminescence from site‐controlled InGaN nanodots fabricated by selective‐area epitaxy
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106777/1/pssa201330362.pd
Interactive Search and Exploration in Online Discussion Forums Using Multimodal Embeddings
In this paper we present a novel interactive multimodal learning system,
which facilitates search and exploration in large networks of social multimedia
users. It allows the analyst to identify and select users of interest, and to
find similar users in an interactive learning setting. Our approach is based on
novel multimodal representations of users, words and concepts, which we
simultaneously learn by deploying a general-purpose neural embedding model. We
show these representations to be useful not only for categorizing users, but
also for automatically generating user and community profiles. Inspired by
traditional summarization approaches, we create the profiles by selecting
diverse and representative content from all available modalities, i.e. the
text, image and user modality. The usefulness of the approach is evaluated
using artificial actors, which simulate user behavior in a relevance feedback
scenario. Multiple experiments were conducted in order to evaluate the quality
of our multimodal representations, to compare different embedding strategies,
and to determine the importance of different modalities. We demonstrate the
capabilities of the proposed approach on two different multimedia collections
originating from the violent online extremism forum Stormfront and the
microblogging platform Twitter, which are particularly interesting due to the
high semantic level of the discussions they feature
TOPICAL REVIEW: Slow light in semiconductor heterostructures
This paper presents an overview of slow light in semiconductor heterostructures. The focus of this paper is to provide a unified framework to summarize and compare various physical mechanisms of slow light proposed and demonstrated in the past few years. We expand and generalize the discussions on fundamental limitation of slow light and the delay–bandwidth product trade-off to include gain systems and other mechanisms such as injection locking. We derive the maximum fractional delay and compare the differences between material dispersion and waveguide dispersion based devices. The delay–bandwidth product is proportional to the square root of the device length for a material dispersion based device but has a linear relationship for a waveguide dispersion based device. Possible scenarios to overcome the delay–bandwidth product limitation are discussed. The prospects of slow light in various applications are also investigated.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/58125/2/d7_5_R01.pd
Room-temperature quantum-dot-like luminescence from site-controlled InGaN quantum disks
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/98692/1/ApplPhysLett_99_263105.pd
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