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Search Results: 1 - 10 of 95148 matches for " Chia-Chen Chang "
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Effectiveness of 4Ps Creativity Teaching for College Students: A Systematic Review and Meta-Analysis  [PDF]
Hsing-Yuan Liu, Chia-Chen Chang
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.86062
Abstract: Although the creativity teaching claims benefit college students by increasing their problem-solving capacities and enhancing professional competencies. There are also the current academic gap between the teaching constructs and efficacy. This study has compared how these and other teaching strategies have evaluated the efficacy of creativity derived from the 4Ps model (person, process, press, and product). In a systematic search, we identified eleven articles published from 2000-2011. Moreover, this study classified the creativity teaching experiences and analyzed the effect size of its efficacy. The weighted mean effect size (ES) of above studies was 0.95, with a standard deviation of 1.59. The ES of personality on technology students was 1.18 (95% confidence interval [CI95] = 0.39 - 1.42), which was greater than that for education and medical students. Studies with more than 56 subjects were seen to have the highest efficacy. The ES of process on professional courses was 1.18 (CI95 = 0.47 - 1.89), and for press in the classroom base the ES was 1.0 (CI95 = 0.61 - 1.38). The ES for the product combined with the creativity survey was 1.22 (CI95 = -0.70 - 3.14).
Spatially inhomogeneous phase in the two-dimensional repulsive Hubbard model
Chia-Chen Chang,Shiwei Zhang
Physics , 2008, DOI: 10.1103/PhysRevB.78.165101
Abstract: Using recent advances in auxiliary-field quantum Monte Carlo techniques and the phaseless approximation to control the sign/phase problem, we determine the equation of state in the ground state of the two-dimensional repulsive single-band Hubbard model at intermediate interactions. Shell effects are eliminated and finite-size effects are greatly reduced by boundary condition integration. Spin-spin correlation functions and structure factors are also calculated. In lattice sizes up to $16\times 16$, the results show signal for phase-separation. Upon doping, the system separates into one phase of density $n=1$ (hole-free) and the other at density $n_c$ ($\sim 0.9$). The long-range antiferromagnetic order is coupled to this process, and is lost below $n_c$.
Quantum disordered phase near the Mott transition in the staggered-flux Hubbard model on a square lattice
Chia-Chen Chang,Richard T. Scalettar
Physics , 2012, DOI: 10.1103/PhysRevLett.109.026404
Abstract: We investigate ground state properties of the half-filled staggered-flux Hubbard model on a square lattice. Energy gaps to charge and spin excitations and magnetic as well as dimer orders are calculated as a function of interaction strength $U/t$ by means of constrained-path quantum Monte Carlo method. It is found that the system is a semi-metal at $U/t\lesssim 5.6$ and a Mott insulator with long-range antiferromagnetic order at $U/t \gtrsim 6.6$. In the range $5.6\lesssim U/t\lesssim 6.6$, the ground state is an correlated insulator where both magnetic and dimer orders are absent. Furthermore, spin excitation in the intermediate phase appears to be gapless, and the measured spin-spin correlation function exhibits power-law decaying behavior. The data suggest that the non-magnetic ground state is a possible candidate for the putative algebraic spin liquid.
Spin and charge order in doped Hubbard model: long-wavelength collective modes
Chia-Chen Chang,Shiwei Zhang
Physics , 2009, DOI: 10.1103/PhysRevLett.104.116402
Abstract: Determining the ground state properties of the two-dimensional Hubbard model has remained an outstanding problem. Applying recent advances in constrained path auxiliary-field quantum Monte Carlo techniques and simulating large rectangular periodic lattices, we calculate the long-range spin and charge correlations in the ground state as a function of doping. At intermediate interaction strengths, an incommensurate spin density wave (SDW) state is found, with antiferromagnetic order and essentially homogeneous charge correlation. The wavelength of the collective mode decreases with doping, as does its magnitude. The SDW order vanishes beyond a critical doping. As the interaction is increased, the holes go from a wave-like to a particle-like state, and charge ordering develops which eventually evolves into stripe-like states.
Constructing and Evaluating an Intergenerational Academic Service-Learning Curriculum in Gerontology  [PDF]
Hsing-Yuan Liu, Chia-Chen Chang, Shu-Yuan Chao
Creative Education (CE) , 2015, DOI: 10.4236/ce.2015.68078
Abstract: Intergenerational Service-Learning has been documented to enhance student learning. Research indicates that students in healthcare professions view working with the geriatric population as a low priority due to negative stereotypes of the elderly. The purpose of this study was to develop a teaching model for establishing partnerships between academic programs and community services for students of gerontology and to evaluate the effect of an Intergeneration Service-Learning curriculum. This research adopted a qualitative approach to study the learning experiences of nursing students during an interdisciplinary community-based healthcare course. Data were collected by participant observation, students’ written journal reflections, verbal presentation of their reflections, instructors’ observations, and focus group discussion. It introduced the rationale, development process, content, and evaluation of the teaching model designed by the researcher. The effects of this curriculum not only were reported as a bridge across generations connecting youth and elders but also fostering positive attitude, improving the ability to care and enhancing commitment to elder people. This article provided an overview of Intergenerational Service-Learning teaching model that involved students in learning outside the traditional classroom and provided a needed service in the community. Otherwise, an important element of this teaching model was to infuse “reflection” in learning process of the nursing students by faulty, which would be appropriate for improving the quality of education and the findings of this study provided direction for the course design for gerontology.
Semiconductor quantum dots in high magnetic fields: The composite-fermion view
Gun Sang Jeon,Chia-Chen Chang,Jainendra K. Jain
Physics , 2006, DOI: 10.1140/epjb/e2007-00060-4
Abstract: We review and extend the composite fermion theory for semiconductor quantum dots in high magnetic fields. The mean-field model of composite fermions is unsatisfactory for the qualitative physics at high angular momenta. Extensive numerical calculations demonstrate that the microscopic CF theory, which incorporates interactions between composite fermions, provides an excellent qualitative and quantitative account of the quantum dot ground state down to the largest angular momenta studied, and allows systematic improvements by inclusion of mixing between composite fermion Landau levels (called $\Lambda$ levels).
Partially spin polarized quantum Hall effect in the filling factor range 1/3 < nu < 2/5
Chia-Chen Chang,Sudhansu S. Mandal,Jainendra K. Jain
Physics , 2003, DOI: 10.1103/PhysRevB.67.121305
Abstract: The residual interaction between composite fermions (CFs) can express itself through higher order fractional Hall effect. With the help of diagonalization in a truncated composite fermion basis of low-energy many-body states, we predict that quantum Hall effect with partial spin polarization is possible at several fractions between $\nu=1/3$ and $\nu=2/5$. The estimated excitation gaps are approximately two orders of magnitude smaller than the gap at $\nu=1/3$, confirming that the inter-CF interaction is extremely weak in higher CF levels.
Composite fermion theory of correlated electrons in semiconductor quantum dots in high magnetic fields
Gun Sang Jeon,Chia-Chen Chang,Jainendra K. Jain
Physics , 2004, DOI: 10.1103/PhysRevB.69.241304
Abstract: Interacting electrons in a semiconductor quantum dot at strong magnetic fields exhibit a rich set of states, including correlated quantum fluids and crystallites of various symmetries. We develop in this paper a perturbative scheme based on the correlated basis functions of the composite-fermion theory, that allows a systematic improvement of the wave functions and the energies for low-lying eigenstates. For a test of the method, we study systems for which exact results are known, and find that practically exact answers are obtained for the ground state wave function, ground state energy, excitation gap, and the pair correlation function. We show how the perturbative scheme helps resolve the subtle physics of competing orders in certain anomalous cases.
Composite-fermion crystallites in quantum dots
Gun Sang Jeon,Chia-Chen Chang,Jainendra K. Jain
Physics , 2003,
Abstract: The correlations in the ground state of interacting electrons in a two-dimensional quantum dot in a high magnetic field are known to undergo a qualitative change from liquid-like to crystal-like as the total angular momentum becomes large. We show that the composite-fermion theory provides an excellent account of the states in both regimes. The quantum mechanical formation of composite fermions with a large number of attached vortices automatically generates omposite fermion crystallites in finite quantum dots.
A Fermion Crystal with Quantum Coherence
Chia-Chen Chang,Gun Sang Jeon,Jainendra K. Jain
Physics , 2004,
Abstract: When two-dimensional electrons are subjected to a very strong magnetic field, they are believed to form a triangular Wigner crystal. We demonstrate that, in the entire crystal phase, this crystal is very well represented by a composite-fermion-crystal wave function, revealing that it is not a simple Hartree-Fock crystal of electrons but an inherently quantum mechanical crystal characterized by a non-perturbative binding of quantized vortices to electrons, which establishes a long range quantum coherence in it. It is suggested that this has qualitative consequences for experiment.
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