Comparative Study Between Power Teaching and Ctl in Increasing Students\u27 Speaking Ability

Tujuan dari penelitian ini adalah untuk mengetahui apakah ada perbedaan yang signifikan dalam pencapaian berbicara siswa yang diajar dengan menggunakan Power Teaching dan CTL. Penelitian ini dilakukan di kelas XI SMAN 10 Bandar Lampung. Hasil pre-test di kelas Power Teaching adalah 65,47, sedangkan di kelas CTL adalah 66,52. Hasil post-test di kelas Power Teaching adalah 76,88, sedangkan di kelas CTL adalah 71,45. Ini berarti bahwa ada perbedaan yang signifikan setelah kedua metode diberikan. Total nilai dalam semua aspek berbicara di kelas Power Teaching adalah 402,5 poin, sedangkan di kelas CTL adalah 129. Ada perbedaan yang signifikan di semua aspek berbicara antara metode Power Teaching dan metode CTL. Ada perbedaan yang signifikan dalam pencapaian berbicara siswa antara siswa yang diajar melalui Power Teaching dan mereka diajarkan melalui CTL. The objectives of this research were to find out whether there is significant differences in students\u27 speaking achievement who are taught by using Power Teaching and CTL and to find out whether there is aspect of two techniques mostly affect. The research was conducted at the eleventh grade of SMAN 10 Bandar Lampung. The result of pre-test in Power Teaching class was 65.47, while in CTL class was 66.52. The result of post-test in Power Teaching class was 76.88, while in CTL class was 71.45. It means that there was significant difference after treatments were given. The total gain in all aspects of speaking of Power Teaching was 402.5 points, while in CTL was 129. It means that there was significant difference in all aspects of speaking between Power Teaching and CTL method. There was a significant difference of students\u27 speaking achievement between the students who were taught through Power Teaching and those taught through CTL

Advancing Science with VGI: Reproducibility and Replicability of Recent Studies using VGI

In scientific research, reproducibility and replicability are requirements to ensure the advancement of our body of knowledge. T his holds true also for VGI - related research and studies. However, the characteristics of VGI suggest particular difficulties in ensuring reproducibility and replicability . In this paper, we aim to examine the current situation in VGI - related research , and identify strategies to ensure realization of its full potential. To do so, we first investigate the different aspects of reprod ucibility and replicability and their impact on VGI - related research . These impacts are different depending on the objectives of the study. Therefore , we examine the study focus of VGI - related research to assess the current body of research and structure o ur assessment . Th is work is based on a rigorous review of the elements of reproducibility and a systematic mapping and analysis of 58 papers on the use of VGI in the crisis management field. Results of our investigation show that reproducibility issues related to data are a serious concern , while reproducibility issues related to analysis methods and processes face fewer challenges. Howe ver, since most studies still focus on analyzing the source data, reproducibility and replicability are still an unsolved problem in VGI - related research. Therefore, we show initiative s tackling the problem, and finally formulate strategies to improve the situatio

Measurement of the infrared transmission through a single doped GaAs quantum well in an external magnetic field: Evidence for polaron effects

Precise absolute far-infra-red magneto-transmission experiments have been performed in magnetic fields up to 33 T on a series of single GaAs quantum wells doped at different levels. The transmission spectra have been simulated with a multilayer dielectric model. The imaginary part of the optical response function which reveals new singular features related to the electron-phonon interactions has been extracted. In addition to the expected polaronic effects due to the longitudinal optical (LO) phonon of GaAs, a new kind of carrier concentration dependent interaction with interface phonons is observed. A simple physical model is used to try to quantify these interactions and explore their origin.Comment: 4 pages, 2 Figure

Magneto infra-red absorption in high electronic density GaAs quantum wells

Magneto infra-red absorption measurements have been performed in a highly doped GaAs quantum well which has been lifted off and bonded to a silicon substrate, in order to study the resonant polaron interaction. It is found that the pinning of the cyclotron energy occurs at an energy close to that of the transverse optical phonon of GaAs. This unexpected result is explained by a model taking into account the full dielectric constant of the quantum well.Comment: 4 pages, 4 figures, to be published in Phys. Rev. Let

Optical absorption spectra of finite systems from a conserving Bethe-Salpeter equation approach

We present a method for computing optical absorption spectra by means of a Bethe-Salpeter equation approach, which is based on a conserving linear response calculation for electron-hole coherences in the presence of an external electromagnetic field. This procedure allows, in principle, for the determination of the electron-hole correlation function self-consistently with the corresponding single-particle Green function. We analyze the general approach for a "one-shot" calculation of the photoabsorption cross section of finite systems, and discuss the importance of scattering and dephasing contributions in this approach. We apply the method to the closed-shell clusters Na_4, Na^+_9 and Na^+_(21), treating one active electron per Na atom.Comment: 9 pages, 3 figure

Mesoscopic spin confinement during acoustically induced transport

Long coherence lifetimes of electron spins transported using moving potential dots are shown to result from the mesoscopic confinement of the spin vector. The confinement dimensions required for spin control are governed by the characteristic spin-orbit length of the electron spins, which must be larger than the dimensions of the dot potential. We show that the coherence lifetime of the electron spins is independent of the local carrier densities within each potential dot and that the precession frequency, which is determined by the Dresselhaus contribution to the spin-orbit coupling, can be modified by varying the sample dimensions resulting in predictable changes in the spin-orbit length and, consequently, in the spin coherence lifetime.Comment: 10 pages, 2 figure

Highly conserved protein kinases involved in the regulation of carbon and amino acid metabolism

It has been clear for over a decade and a half that ancient signalling pathways controlling fundamental cellular processes are highly conserved throughout the eukaryotes. Two plant protein kinases, sucrose non-fermenting 1 (SNF1)-related protein kinase (SnRK1) and general control non-derepressible 2 (GCN2)-related protein kinase are reviewed here. These protein kinases show an extraordinary level of conservation with their fungal and animal homologues given the span of time since they diverged from them. However, close examination of the signalling pathways in which they operate also reveals intriguing differences in activation and function