The spin-splitting energies in strained bulk wurtzite aluminum nitride (AlN) are studied using the linear combination of atomic orbital method. It is found that strain and crystal field induce not only a linear-k (£\wz ) but also two cubic-k terms (£^¡¦and £f¡¦ ) in the two-band k¡Dp Hamiltonian Hso=(£\wz-£^¡¦k2//+£f¡¦k2z)(£mxky-£mykx)+H0so, where H0so=(-£^0k2//+£f0k2z)(£mxky-£mykx) is for ideal wurtzite and generates a cone-shaped minimum-spin-splitting (MSS) surface. As biaxial strain increases, the shape of the MSS surface changes from a hexagonal hyperboloid of two sheets in unstrained AlN to a hexagonal cone, and eventually becomes a hyperboloid of one sheet. The spin-splitting energies of first conduction band for A-plane and M-plane wurtzite are calculated by the sp3 linear combination of atomic orbital (LCAO). The results show the spin-splitting energies are dominated by linear-k term but contribution of cubic-k terms can not be neglected for larger k//. The parameter of linear-k and cubic-k terms are evaluated from the LCAO calculated spin-splitting energies fitting to two band k¡Ep model as increasing well width. The coefficients of linear-k and cubic-k terms decrease.

This study explores whether the third-person effect caused by the published article in the Ptt Gossiping bulletin board. And the follow-up support to restrict the inappropriate content in the Ptt Gossiping bulletin board. Source of this study is use recommended system detected written by Expect language. It would detect popular articles and published articles. Pick a representative to do the test article.and place in the survey questionnaire online. The result shows: All of the four article have third person effect. Affect the follow¡Ðup support restrict the behavior of inappropriate content.

We studied terahertz radiation from InN in our paper. We set up " Terahertz Time-Domain Spectroscopy system" and investigate Terahertz emission from InN. We take our sample(InN) in the rotation stage and we rotate different angle to detect the THz intensity data and wave shape and also the mechanisms of THz wave emitted. We research the influence from different background carrier density, band gap, mobility and structure(Zb-InN, W-InN) of InN to produce Terahertz radiation. Finally, we dicuss the THz amplitude and shape influenced from the internal surface field effect, Photo Dember effect, stacking fault, c-plane and m-plane from InN.

This dissertation focuses on the study of spin-dependent transport in systems with strong spin-orbit coupling within their band structure. In particular we focus on the anomalous Hall effect, the spin Hall effect, and the Aharonov-Casher effect whose origins, are linked to the presence of spin-orbit coupling. Given the theoretical controversy surrounding these effects we further simplify our studies to semiconductor systems where the band structure is much simpler than in metallic systems with heavy elements. To obtain finite analytical results we focus on reduced dimensions (two and one dimensions) which can be explored experimentally. To set the stage, we discuss the origins of the strong spin-orbit coupling in semiconductors deriving the effective interaction from the Dirac equation. We discuss in detail the skew scattering contribution to the anomalous Hall effect in two-dimensional systems, which is dominant for systems with low impurity concentrations, and find that it is reduced when the two chiral subbands are partially occupied in an electron gas and vanishes for a hole gas, regardless of the band filling. We also present calculations for all contributing mechanisms. We propose a device to test this prediction and study the crossover from the intrinsic to the extrinsic anomalous Hall effect. We calculate all contributions to the anomalous Hall effect in electron systems using the Kubo-Streda formalism. We find that all contributions vanish when both subbands are occupied and that the skew scattering contribution dominates when only the majority subband is occupied. We calculate the interference effects due to spin-orbit interaction in mesoscopic ring structures patterned from HgTe quantum wells related to the Aharonov-Casher effect and the spin Hall effect. We find that the transport properties are affected by the carrier density as well as the spin orbit interaction. We find that the conductivity is larger in hole gas systems. We also show that devices with inhomogenous spin orbit interaction exhibit an electrically controlled spin-flipping mechanism.

In this thesis, two series of self-assembled GaN and AlxGa1-xN nanorods are grown by plasma-assisted molecular beam epitaxy (PAMBE) on Si(111) wafer. The Al contents in AlxGa1-xN nanorods is varied from 6% to 75% by changing the Al cell beam flux (BFM). Second, the GaN/AlGaN multiple quantum wells (MQWs) with variation thickness are grown on the GaN nanorods with a p-GaN layer on the top. Al concentration is determined by electron probe x-ray micro-analysis (EPMA) and x-ray diffraction (XRD). The reflection high-energy electron diffraction (RHEED) and scanning electron microscopy (SEM) images show that the height, density and morphology of nanorods depend on the Al content. The (micro-)PL, CL and Raman spectra also show the variation of the characterization from those of GaN to AlN. The transmission electron microscopy (TEM) images show that the GaN/AlGaN MQWs structures with well widths of 1, 2, 3, 4, 6, 8 and 16 c-LC (Lattice constant on c-direction) were successful grown on the nanorods. The (micro-)PL and CL spectra show red-shift of the peak position with the decrease of Mg-doped concentration. When the well thickness is less then 4 c-LC, the CL spectra show blue-shift of the peak position with the decrease of the well thickness due to the Quantum-confined effect and the polarization effect in MQWS.

The purpose of the article is to analyze the relationship among dividend policy,future earnings and growth opportunities.And the results are below: 1.Total dividend and cash dividend can predict future earnings,but stock dividend can only reflect current earnings 2.total dividend and stock dividend are signaling effect,but I have a diffent result in cash dividend. Using MBA,MBE and E/P as substitute variables,it is contracting effect.But using R&D as a substitute variable,it is signaling effect.

This paper probes into institutional investor¡¦s impact on Taiwan¡¦s stock market and its shareholding ratio in the relation of return. We aim to find out an effective return index of degree in order to provide another reference basis for investors. This research uses listed companies from 1999 to 2003 as sample. The analysis result shows that Taiwan has gone against the phenomenon of book-to-market and size effect in the past five years, and institutional investors¡¦ partiality is one of the reasons causing this phenomenon. The stock with high share of all kinds of institutional investors is expected to have high return in addition. In consideration of the momentum of the share of all kinds of institutional investors, we are unable to prove that the stock which has the positive momentum of share of all kinds of institutional investors will yield high return. The size factor and book-to-market ratio factor at the regular value prove whether institutional investors still have the ability to select stocks. The result proves that the group with high share of all kinds of institutional investors still has high return under the same book-to-market ratio and size factor, and proves that institutional investors indeed have better tactics in selecting stocks.

Internet has become a new form of mass media since its commercialization in early 1990¡¦s. While the transaction platform moves from bricks-and-motar to Internet, potential factors that influence consumers¡¦ purchase decisions changed. Because they cannot touch the product and interact with sales person, Internet buyers can only make decisions based on information presented on web pages. Under this circumstance, how the presentation of information such as advertisement and product description influence consumers¡¦ buying decision is an important issue. When the information is presented in different ways, people might make biased decisions. This study conducts four laboratory experiments which aim to investigate two decision biases in e-commerce context: framing effect and ancoring effect. The first two experiments focus on the framing effect and the last two experiments focus on the anchoring effect. Framing effect refers to the situation in which people¡¦s buying intention is influenced by different framing messages. Anchoring effect center on the situation in which people¡¦s price estimates are influenced by different anchor points presented in web pages. Three different kinds of framing messages which are formed by combining the attribute framing, goal framing and risky choice framing message and positive and negative presentation are considered in the first two experiments. Moreover, the subjects were assigned into two groups in different level of intrinsic self-relevence to understand whether it plays the moderating role in framing effect. In anchoring effect, in addition to the influence of high and low anchor points on subjects¡¦ price estimates, we also consider the moderating role of the operation of anchor points (one-way/two way), the reinforcement of anchor points (normal/intensified), and the relevancy between anchor and target (relevant/unrelevant). The results indicated that attribute framing effect is stable and is not influenced by subjects¡¦ level of intrinsic self-relevance, whereas the occurrence of goal framing effect and risky choice framing effect depends on the participants¡¦ level of intrinsic self-relevance. For subjects low in intrinsic self-relevance are more influenced by framing message and thus results in different buying intention or choices than those high in intrinsic self-relevance. This study also test and verify the robustness of anchoring effect. Estimaes made by participants in high and low anchor conditions is significantly different no matter the anchor is manipulated in one-way or two-way. In addition, the result of anchoring experiment supports the argument that the relevancy between anchor and target is important for the occurrence of anchoring effect. The moderating effect of anchor reinceforcement depends on the anchor was operated in one-way or two way condition. Anchoring effect is stable despite that the anchor is manipulated in normal or intensified condition when the anchor is manipulated in two-way. On the other hand, when the anchoring effect is manipulated in one-way condition, the anchor reinceforcement plays the role the moderator. Anchoring effect can be observed only when the anchor point is reinforced by appearing for three times. This study serves as a foundation for future study in e-commerce area. The procedures and experimental designs in this study can be either replicated or modified with a different sample to gather further evidence for the results discovered. Further, it can benefit practitioners in improving the design of e-commerce interfaces in real world applications.

In this thesis, a bottom gate TFT with smart body tie device is realized, For a PDSOI devices, which usually uses large layout areas of body ties, and it has self-heating effect resulting from the buried oxide between the silicon film and substrate, which has a lower thermal conductivity. In order to suppress the short channel effect and reduce leakage current, we dug out in advance the PN junction to formed the ultra thin film body, besides, in order to reduce Miller's capacitance effect we formed enough thickness of spacer at both sides of the bottom gate and let the source and the drain region do not too closer nearly. According to the simulation results of ISE TCAD, the TFT with smart body tie device can alleviate self-heating effect and can achieve kink-free at output characteristic curve due to hot carriers by impact ionization and enhance the breakdown voltage of the device. Although the drive current of the TFT device lower than conventional TFT due to the parasitic resistance in the body region, the output characteristic curve is smooth in the saturation zone; the device suppress the short channel effect and improve the performance of the device due to most areas of PN junction are dug out.

In this thesis, we present a new Poly - Si TFT process method to overcome Self - heating effect and Floating body effect. The main drawback of a conventional Poly - Si TFT is the existence of self - heating effect and floating body effect. The self - heating effect leads to drain current reduced and the floating body effect leads to premature device breakdown and kink effects. Here, we utilize all kinds of different isolation technologies to form non - continuing buried layer. Between the non - continuing buried layer there are pass ways, which contact the active region and the substrate directly. Because of conventional LOCOS isolation technology has longer bird¡¦s beak, the familiar method of SILO and PBL isolation technologies are used to reduce bird¡¦s beak. Also, we use STI isolation technology to build up non - continuing buried layer, which can control the width of pass way more easily. It is proved from the measurement that the pass way can slow down the self - heating effect and the floating body effect successfully.