Matching Items (22)

128056-Thumbnail Image.png

Crystal orientation dependent intersubband transition in semipolar AlGaN/GaN single quantum well for optoelectronic applications

Description

The optical properties of intersubband transition in a semipolar AlGaN/GaN single quantum well (SQW) are theoretically studied, and the results are compared with polar c-plane and nonpolar m-plane structures. The

The optical properties of intersubband transition in a semipolar AlGaN/GaN single quantum well (SQW) are theoretically studied, and the results are compared with polar c-plane and nonpolar m-plane structures. The intersubband transition frequency, dipole matrix elements, and absorption spectra are calculated for SQW on different semipolar planes. It is found that SQW on a certain group of semipolar planes (55° < θ < 90° tilted from c-plane) exhibits low transition frequency and long wavelength response with high absorption quantum efficiency, which is attributed to the weak polarization-related effects. Furthermore, these semipolar SQWs show tunable transition frequency and absorption wavelength with different quantum well thicknesses, and stable device performance can be achieved with changing barrier thickness and Al compositions. All the results indicate that the semipolar AlGaN/GaN quantum wells are promising candidate for the design and fabrication of high performance low frequency and long wavelength optoelectronic devices.

Contributors

Agent

Created

Date Created
  • 2016-05-05

128067-Thumbnail Image.png

Analysis of loss mechanisms in InGaN solar cells using a semi-analytical model

Description

InGaN semiconductors are promising candidates for high-efficiency next-generation thin film solar cells. In this work, we study the photovoltaic performance of single-junction and two-junction InGaN solar cells using a semi-analytical

InGaN semiconductors are promising candidates for high-efficiency next-generation thin film solar cells. In this work, we study the photovoltaic performance of single-junction and two-junction InGaN solar cells using a semi-analytical model. We analyze the major loss mechanisms in InGaN solar cell including transmission loss, thermalization loss, spatial relaxation loss, and recombination loss. We find that transmission loss plays a major role for InGaN solar cells due to the large bandgaps of III-nitride materials. Among the recombination losses, Shockley-Read-Hall recombination loss is the dominant process. Compared to other III-V photovoltaic materials, we discovered that the emittance of InGaN solar cells is strongly impacted by Urbach tail energy. For two- and multi-junction InGaN solar cells, we discover that the current matching condition results in a limited range of top-junction bandgaps. This theoretical work provides detailed guidance for the design of high-performance InGaN solar cells.

Contributors

Agent

Created

Date Created
  • 2016-06-01

153788-Thumbnail Image.png

Research on critical indicators of Shanghai international financial center construction

Description

The city of Shanghai is set to become an international financial center (IFC) by 2020. To achieve this goal, it is imperative to clearly define the key characteristics of an

The city of Shanghai is set to become an international financial center (IFC) by 2020. To achieve this goal, it is imperative to clearly define the key characteristics of an IFC. In this study I draw from recent research on the ranking of IFCs to develop an index of these key characteristics that can be used to assess a city’s standings as an IFC. Based on a review of prior research, I first put together a comprehensive list of the indicators that have been used to evaluate IFCs, which includes six first-level indicators and 34 second-level indicators. I then collect information on all these indicators from public sources for the following eight cities each year from 2011 to 2013: London, New York, Paris, Hong Kong, Tokyo, Singapore, Beijing and Shanghai. Next, I conduct a principal component analysis (PCA) on my data, and obtain four primary factors that contain most information of the original 34 indicators. The first factor covers 18 of the original indicators and reflects a city’s level of development in general business environment. The second factor covers 10 of the original indicators and reflects a city’s level of development in financial markets. The third factor covers three of the original indicators and reflects a city’s level of economic vitality. The fourth factor covers three of the original indicators and reflects a city’s level of the costs of living. I further calculate the composite scores for the above eight cities along these four factors, and find that these eight cities can be classified into three tiers on the basis of their scores. The first tier consists of New York and London; the second tier consists of Singapore, Hong Kong, Paris and Tokyo; and the third tier consists of Shanghai and Beijing. I also find that Shanghai has been making progress in its scores along these four factors over the last three years, especially regarding financial market development, economic vitality, and cost of living. What Shanghai needs to focus on next is to improve its business environment so that it can move up to the second tier in IFC status.

Contributors

Agent

Created

Date Created
  • 2015

155416-Thumbnail Image.png

Research on the Relationship between Integrity and Market Economy in China

Description

The discussion on the question of integrity has a long history. It is regarded as an important research proposition in the fields of Chinese and Western philosophy, law, sociology, ethics,

The discussion on the question of integrity has a long history. It is regarded as an important research proposition in the fields of Chinese and Western philosophy, law, sociology, ethics, management and economics. Even though the research results are combined with each other for reference, there is still a lack of comprehensive analysis and empirical study on integrity. In the process of transition from planned economy to market economy, a series of problems have arisen. The problem of dishonesty has caused huge losses to the society as a whole. Therefore, it is of great theoretical and practical importance to conduct a quantitative analysis on the topic of trustworthiness, and investigate the relationship between trustworthiness and the economy.

This paper adopts a game theory model to analyze the reasons for corporate dishonesty, and the problem faced by the regulators. Based on the results from the model, we clarify the duties of various subjects (enterprises, governments and credit organizations) in the construction of a society with integrity.

Then, we analyze different cases of dishonesty and point out the channels through which the economy would be affected by the problem of dishonesty. (1) as an institution, integrity helps reduce the transaction cost and prompt market efficiency; (2) integrity serves as a production factor that influences the economy; (3) integrity will affect the economy by influencing the ability of small and medium enterprises to borrow.

Finally, after we establish the relationship between integrity and the market economy, we use survey data to conduct an empirical analysis on the development of integrity in China. The survey data allow us to build a cycle of integrity risk, and identify the current position in the cycle. Besides, we also compare the region difference regarding integrity, which supports the idea that integrity matters for the economic development.

Because the questionnaires are the only way to obtain the data that can be analyzed at present, the paper not only fills in the research gap caused by the lack of data, but also jumps out of the existing research methods, and enriches the empirical work for the study of integrity.

Contributors

Agent

Created

Date Created
  • 2017

154377-Thumbnail Image.png

Research on Factors Influencing Individual’s Behavior of Energy Management

Description

With the rapid rise of distributed generation, Internet of Things, and mobile Internet, both U.S. and European smart home manufacturers have developed energy management solutions for individual usage. These applications

With the rapid rise of distributed generation, Internet of Things, and mobile Internet, both U.S. and European smart home manufacturers have developed energy management solutions for individual usage. These applications help people manage their energy consumption more efficiently. Domestic manufacturers have also launched similar products.

This paper focuses on the factors influencing Energy Management Behaviour (EMB) at the individual level. By reviewing academic literature, conducting surveys in Beijing, Shanghai and Guangzhou, the author builds an integrated behavioural energy management model of the Chinese energy consumers. This paper takes the vague term of EMB and redefines it as a function of two separate behavioural concepts: Energy Management Intention (EMI), and the traditional Energy Saving Intention (ESI).

Secondly, the author conducts statistical analyses on these two behavioural concepts. EMI is the main driver behind an individual’s EMB. EMI is affected by Behavioural Attitudes, Subjective Norms, and Perceived Behavioural Control (PBC). Among these three key factors, PBC exerts the strongest influence. This implies that the promotion of the energy management concept is mainly driven by good application user experience (UX). The traditional ESI also demonstrates positive influence on EMB, but its impact is weaker than the impacts arising under EMI’s three factors. In other words, the government and manufacturers may not be able to change an individual's energy management behaviour if they rely solely on their traditional promotion strategies. In addition, the study finds that the government may achieve better promotional results by launching subsidies to the manufacturers of these kinds of applications and smart appliances.

Contributors

Agent

Created

Date Created
  • 2016

153538-Thumbnail Image.png

Factors influencing automobile financial leasing and risk control: an empirical study on China automobile leasing market

Description

Financing lease has bloomed as a new financing tool in China for the last several years. In this thesis I investigate the factors that influence China’s automobile financial leasing decisions

Financing lease has bloomed as a new financing tool in China for the last several years. In this thesis I investigate the factors that influence China’s automobile financial leasing decisions by both lessors and lessees through market surveys. Based on Probit regression analysis of the data collected from 250 companies and 300 individuals, I find that a firm is more likely to use automobile financial leasing when its corporate tax rate is lower, growth potential is more stabilized, and profit is higher. It is also more likely to happen when a firm's long-term debt ratio and its degree of internationalization are higher. At the individual level, I find that the likelihood of individuals’ leasing decision is influenced by their risk preference, income level, and car price. Individuals’ gender, age and education level show no effect.

Using the analytic hierarchy process (AHP) analysis, I further find that financing costs, service value-added, and products diversity are the three most important competitive factors for the auto financial leasing service providers. This is the case for both the corporate and individual customers in the sample. By contrast, the factors of sales channel and government relationship are found to be much less important. Finally, through an in-depth case study of the leasing company Shanghai Auto Financial Leasing, I find that the key factors determining the customers’ credit default risk are interest rate and automobile type. I also investigate factors that influence business risk during the automobile procurement stage, at the selling stage, and toward the disposition stage. The managerial implications of the above results are discussed throughout the thesis.

Contributors

Agent

Created

Date Created
  • 2015

153599-Thumbnail Image.png

Valuation Tools of Conglomerates and Their Application in the Case of Fosun International

Description

There has been much debate in the world of academia over the valuation of conglomerates. This thesis proposes the use of the EVA theory in explaining fluctuations in conglomerates’ valuation,

There has been much debate in the world of academia over the valuation of conglomerates. This thesis proposes the use of the EVA theory in explaining fluctuations in conglomerates’ valuation, and we believe that ROIC, WACC, and ROIC-WACC are three indicators that to a certain extent explain these valuation fluctuations. Through analysis of a sample containing 23 conglomerates, this thesis finds that ROIC, WACC, and ROIC-WACC exhibit positive correlation with valuation fluctuations. In the case study on Fosun, this thesis finds that ROIC-WACC is highly correlated with Fosun’s valuation fluctuations and next with ROIC. Thus this thesis conjectures that for investment companies for which investment capital is derived largely from insurance float, such as Fosun, ROIC-WACC is a better valuation tool.

Contributors

Agent

Created

Date Created
  • 2015

153596-Thumbnail Image.png

Comprehensive Cost Factor Based Analysis of Chinese Tire Industry: An International Comparative Study

Description

The current study combines field study, survey study, and public financial reports, and conducts an in-depths comprehensive study of the cost of the global tire industry. By comparing the price

The current study combines field study, survey study, and public financial reports, and conducts an in-depths comprehensive study of the cost of the global tire industry. By comparing the price and the total cost structure of standardized tire products, we investigate Chinese tire industry’s global competitiveness, especially in light of China’s fast increasing labor cost. By constructing a comprehensive cost index (CCI), this dissertation estimates the evolution and forecasts the trend of global tire industry’s cost structure. Based on our empirical analysis, we provide various recommendations for Chinese tire manufacturers, other manufacturing industries, and foreign trade policy makers.

Contributors

Agent

Created

Date Created
  • 2015

158511-Thumbnail Image.png

Nonlinear Integrated Photonics in the Visible Spectrum Based on III-N Material Platform

Description

Photonic integrated circuit (PIC) in the visible spectrum opens up new opportunities for frequency metrology, neurophotonics, and quantum technologies. Group III nitride (III-N) compound semiconductor is a new emerging material

Photonic integrated circuit (PIC) in the visible spectrum opens up new opportunities for frequency metrology, neurophotonics, and quantum technologies. Group III nitride (III-N) compound semiconductor is a new emerging material platform for PIC in visible spectrum. The ultra-wide bandgap of aluminum nitride (AlN) allows broadband transparency. The high quantum efficiency of indium gallium nitride (InGaN) quantum well is the major enabler for solid-state lighting and provides the opportunities for active photonic integration. Additionally, the two-dimensional electron gas induced by spontaneous and polarization charges within III-N materials exhibit large electron mobility, which is promising for the development of high frequency transistors. Moreover, the noncentrosymmetric crystalline structure gives nonzero second order susceptibility, beneficial for the application of second harmonic generation and entangled photon generation in nonlinear and quantum optical technologies. Despite the promising features of III-N materials, the investigations on the III-N based PICs are still primitive, mainly due to the difficulties in material growth and the lack of knowledge on fundamental material parameters. In this work, firstly, the fundamental nonlinear optical properties of III-N materials will be characterized. Then, the fabrication process flow of III-N materials will be established. Thirdly, the waveguide performance will be theoretically and experimentally evaluated. At last, the supercontinuum generation from visible to infrared will be demonstrated by utilizing soliton dynamics in high order guided modes. The outcome from this work paves the way towards fully integrated optical comb in UV and visible spectrum.

Contributors

Agent

Created

Date Created
  • 2020

153535-Thumbnail Image.png

An Empirical Study on the Growth of Small and Medium-Sized Pharmaceutical Enterprises through M&A in China

Description

This thesis starts with an analysis of the current situation of the pharmaceutical industry in China, and discusses the strategic mergers and acquisitions (M&A) by small and medium-sized enterprises (SMEs)

This thesis starts with an analysis of the current situation of the pharmaceutical industry in China, and discusses the strategic mergers and acquisitions (M&A) by small and medium-sized enterprises (SMEs) in the pharmaceutical industry in China. It elaborates on the rationale for the development of the mergers and acquisitions of the pharmaceutical SMEs. Then a literature review is provided on the causes of corporate mergers and acquisitions such as the economies of scale, synergistic effect, transaction costs, market power, and strategic diversification.Next,the thesis analyzes the underlying rationale for the M&A transactions in the pharmaceutical industry in China, and explores the likely path of successful value creation for pharmaceutical SMEs in China. Specifically, with five in-depth case studies of M&A transactions of pharmaceutical firms, this thesis reveals the critical success factors leading to value creation and growth in the practice of mergers and acquisitions of the pharmaceutical SMEs in China.

Contributors

Agent

Created

Date Created
  • 2015