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Search Results: 1 - 10 of 90703 matches for " Yu-Huang Chiu "
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Beating oscillations of magneto-optical spectra in simple hexagonal graphite
Rong-Bin Chen,Yu-Huang Chiu,Ming-Fa Lin
Physics , 2014, DOI: 10.1016/j.cpc.2014.12.007
Abstract: The magneto-optical properties of simple hexagonal graphite exhibit rich beating oscillations, which are dominated by the field strength and photon energy. The former has a strong effect on the intensity, the energy range of the beating and the number of groups, and the latter modulates the total group numbers of the oscillation structures. The single-particle and collective excitations are simultaneously presented in the magnetoreflectance spectra and can be precisely distinguished. For the loss function and reflectance, the beating pattern of the first group displays stronger intensities and broader energy range than other groups. Simple hexagonal graphite possesses unique magneto-optical characteristics that can serve to identify other bulk graphites.
Low-frequency Magneto-optical Spectra of Bilayer Bernal Graphene
Yen-Hung Ho,Yu-Huang Chiu,De-Hone Lin,Chen-Peng Chang,Ming-Fa Lin
Physics , 2009,
Abstract: The low-frequency magneto-optical absorption spectra of bilayer Bernal graphene are studied within the tight-binding model and gradient approximation. The interlayer interactions strongly affect the electronic properties of the Landau levels (LL's), and thus enrich the optical absorption spectra. According to the characteristics of the wave functions, the low-energy LL's can be divided into two groups. This division results in four kinds of optical absorption peaks with complex optical selection rules. Observing the experimental convergent absorption frequencies close to zero magnetic field might be useful and reliable in determining the values of several hopping integrals. The dependence of the optical absorption spectra on the field strength is investigated in detail, and the results differ considerably from those of monolayer graphene.
Optical transitions between Landau levels: AA-stacked bilayer graphene
Yen-Hung Ho,Jhao-Ying Wu,Rong-Bin Chen,Yu-Huang Chiu,Ming-Fa Lin
Physics , 2010, DOI: 10.1063/1.3488806
Abstract: The low-frequency optical excitations of AA-stacked bilayer graphene are investigated by the tight-binding model. Two groups of asymmetric LLs lead to two kinds of absorption peaks resulting from only intragroup excitations. Each absorption peak obeys a single selection rule similar to that of monolayer graphene. The excitation channel of each peak is changed as the field strength approaches a critical strength. This alteration of the excitation channel is strongly related to the setting of the Fermi level. The peculiar optical properties can be attributed to the characteristics of the LL wave functions of the two LL groups. A detailed comparison of optical properties between AA-stacked and AB-stacked bilayer graphenes is also offered. The compared results demonstrate that the optical properties are strongly dominated by the stacking symmetry. Furthermore, the presented results may be used to discriminate AABG from MG, which can be hardly done by STM.
Magneto-optical Selection Rules in Bilayer Bernal Graphene
Yen-Hung Ho,Yu-Huang Chiu,De-Hone Lin,Chen-Peng Chang,Ming-Fa Lin
Physics , 2010, DOI: 10.1021/nn9015339
Abstract: The low-frequency magneto-optical properties of bilayer Bernal graphene are studied by the tight-binding model with four most important interlayer interactions taken into account. Since the main features of the wave functions are well depicted, the Landau levels can be divided into two groups based on the characteristics of the wave functions. These Landau levels lead to four categories of absorption peaks in the optical absorption spectra. Such absorption peaks own complex optical selection rules and these rules can be reasonably explained by the characteristics of the wave functions. In addition, twin-peak structures, regular frequency-dependent absorption rates and complex field-dependent frequencies are also obtained in this work. The main features of the absorption peaks are very different from those in monolayer graphene and have their origin in the interlayer interactions.
Magnetic quantization in multilayer graphenes
Chiun-Yan Lin,Jhao-Ying Wu,Yih-Jon Ou,Yu-Huang Chiu,Ming-Fa Lin
Physics , 2015,
Abstract: Essential properties of multilayer graphenes are diversified by the number of layers and the stacking configurations. For an $N$-layer system, Landau levels are divided into $N$ groups, with each identified by a dominant sublattice associated with the stacking configuration. We focus on the main characteristics of Landau levels, including the degeneracy, wave functions, quantum numbers, onset energies, field-dependent energy spectra, semiconductor-metal transitions, and crossing patterns, which are reflected in the magneto-optical spectroscopy, scanning tunneling spectroscopy, and quantum transport experiments. The Landau levels in AA-stacked graphene are responsible for multiple Dirac cones, while in AB-stacked graphene the Dirac properties depend on the number of graphene layers, and in ABC-stacked graphene the low-lying levels are related to surface states. The Landau-level mixing leads to anticrossings patterns in energy spectra, which are seen for intergroup Landau levels in AB-stacked graphene, while in particular, a formation of both intergroup and intragroup anticrossings is observed in ABC-stacked graphene. The aforementioned magneto-electronic properties lead to diverse optical spectra, plasma spectra, and transport properties when the stacking order and the number of layers are varied. The calculations are in agreement with optical and transport experiments, and novel features that have not yet been verified experimentally are presented.
The Impact of Effort on Consumers' Purchase Decisions

TONG Lu-Qiong,ZHENG Yu-Huang,ZHAO Ping,

心理学报 , 2011,
Abstract: Consumers often face various self-control problems in their everyday life. Without good justifications, engaging in self-gratification may evoke guilt, consequently consumers only allow themselves to relax their self-control when they have compelling justifications. Past research has shown that there are several kinds of justifications (e.g., effort, excellence, virtuous behavior, self-control goal progress, etc.) which lead to self-gratification. In this study, we attempt to investigate the impact of effor...
Genetic algorithm based on complex-valued encoding

ZHENG Zhao-hui,ZHANG Yan,QIU Yu-huang,
,张 焱,裘聿皇

控制理论与应用 , 2003,
Abstract: Complex-valued Encoding is applied to genetic algorithms (GA). One complex number is used to denote each diploid and define the genetic operators. Each pair of alleles corresponds to one complex number. The independent variables of the objective function are determined by the modules and angles of their corresponding complex numbers. Compared with the conventional genetic algorithm based on real-valued encoding or binary encoding, the proposed algorithm expands the dimensions for denoting. The computer simulation results are offered to demonstrate the efficiency of the method.
PAN Jie, WANG Chen-xi , LANG Yu-huang , LIU Min , YANG Li-ka , CHEN Feng-yuan △
- , 2016,
The Influence of the Distance from the Contact Point to the Crest of Bone on the Presence of the Interproximal Dental Papilla.
Yu-Jen Wu,Yu-Kang Tu,Shay-Min Huang,Chiu-Po Chan
Chang Gung Medical Journal , 2003,
Abstract: Background: Loss of the interproximal dental papilla may cause functional and, especiallyin the maxillary anterior region, phonetic and severe esthetic problems. Thepurpose of this study was to investigate whether the distance from the contactpoint to the bone crest on standardized periapical radiographs of themaxillary anterior teeth could be correlated with the presence of the interproximalpapilla in Taiwanese patients.Methods: In total, 200 interproximal sites of maxillary anterior teeth in 45 randomlyselected patients were examined. Selected subjects were adult Taiwanesewith fully erupted permanent dentition. The presence of the interproximalpapilla was determined visually. If there was no visible space apical to thecontact area, the papilla was recorded as being present. The distance from thecontact point to the crest of bone was measured on standardized periapicalradiographs using a paralleling technique with a RinnXCP holder.Results: Data revealed that when the distance from the contact point to the bone creston standardized periapical radiographs was 5 mm or less, the papillae werealmost 100% present. When the distance was 6 mm, 51% of the papillaewere present, and when the distance was 7 mm or greater, only 23% of thepapillae were present.Conclusion: The distance from the contact point to the bone crest on standardized periapicalradiographs of the maxillary anterior teeth is highly associated with thepresence or absence of the interproximal papilla in Taiwanese patients, and isa useful guide for clinical evaluation.
Clinical features of delirious mania: a series of five cases and a brief literature review
Bo-Shyan Lee, Si-Sheng Huang, Wen-Yu Hsu, Nan-Ying Chiu
BMC Psychiatry , 2012, DOI: 10.1186/1471-244x-12-65
Abstract: We describe the cases of five patients with delirious mania admitted to an acute inpatient psychiatric unit between January 2005 and January 2007, and discuss the cases in the context of a selective review of the clinical literature describing the clinical features and treatment of delirious mania.Two patients had two episodes of delirious mania. Delirium usually resolved faster than mania though not always the case. Delirious mania remitted within seven sessions of the electroconvulsive therapy (ECT).Delirious mania is a potentially life-threatening but under-recognized neuropsychiatric syndrome. Delirious mania that is ineffectively treated may induce a new-onset manic episode or worsen an ongoing manic episode, and the patient will need prolonged hospitalization. Delirious mania also has a close relationship with catatonia. Early recognition and aggressive treatment, especially with electroconvulsive therapy, can significantly reduce morbidity and mortality.Concurrence of delirium and mania is unusual. While delirious mania is not described in the Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV), it does exist through the evidence of clinical reports. The syndrome was first described by Calmiel in 1832. In 1849, Luther Bell, who is credited with providing the first comprehensive description of the syndrome, reported 40 patients with the condition out of 1700 admissions to McLean Hospital [1]. Three-quarters of these patients died. In 1921, Kraepelin categorized mania into 3 types: acute, delusional, and delirious [2,3]. To better describe the range of severity, Klerman [4] described the spectrum of mania in 5 stages: normal, neurotic, hypomanic, manic, and delirious. However, the description of delirious mania provided in Klerman’s classification was very similar to the delusional type defined earlier by Kraepelin, and it would be coded as bipolar I disorder, manic episode with psychotic feature in the DSM-IV. Here delirious mania is
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