Incipient quantum melting of the one-dimensional Wigner lattice

A one--dimensional tight--binding model of electrons with long--range Coulomb interactions is studied in the limit where double site occupancy is forbidden and the Coulomb coupling strength $V$ is large with respect to the hopping amplitude $t$. The quantum problem of a kink--antikink pair generated in the Wigner lattice (the classical ground state for $t=0$) is solved for fillings $n=1/s$, where $s$ is an integer larger than 1. The pair energy becomes negative for a relatively high value of $V$, $V_c/t\approx s^3$. This signals the initial stage of the quantum melting of the Wigner lattice

Variational Wave Function for Generalized Wigner Lattices in One Dimension

We study a system of electrons on a one-dimensional lattice, interacting through the long range Coulomb forces, by means of a variational technique which is the strong coupling analog of the Gutzwiller approach. The problem is thus the quantum version of Hubbard's classical model of the generalized Wigner crystal [J. Hubbard, Phys. Rev. B 17, 494 (1978)]. The magnetic exchange energy arising from quantum fluctuations is calculated, and turns out to be smaller than the energy scale governing charge degrees of freedom. This approach could be relevant in insulating quasi-one-dimensional compounds where the long range Coulomb interactions are not screened. In these compounds charge order often appears at high temperatures and coexists with magnetic order at low temperatures.Comment: 4 pages, proceedings of ECRYS-200

Spontaneous CP Symmetry Breaking at the Electroweak Scale

We present a top-condensation model in which the CP symmetry is spontaneously broken at the electroweak scale due to the condensation of two composite Higgs doublets. In particular the CP-violating phase of the CKM matrix is generated. A simpler model where only one quark family is included is also discussed. In this case, for a general four-fermion interaction ($G_{tb}\neq 0$), the particle spectrum is the one of the one Higgs doublet model.Comment: 25 pages, LaTeX. References and comment adde

A Case Study in the Philippines

학위논문(석사)--서울대학교 대학원 :농업생명과학대학 산림과학부(산림환경학전공),2019. 8. Youn, Yeo-Chang.Climate change is a global problem caused by cumulative actions of multi-level actors; hence, solving the climate change problem requires collective action. Networks have been created to establish cooperation and collaboration between multi-level stakeholders; this facilitates the exchange of knowledge and strengthens the cooperation between countries and stakeholders. Cooperation is not only relevant for actions against climate change, but it also contributes to the development of the local communities by increasing their social capital through their involvement and participation in climate change mitigation projects. Through social relations, local communities expand their assets which are relevant to gaining more economic profits. This study assessed the impacts of local community participation in mangrove restoration projects to social capital; and further analyzed its implications peoples access to information and access to services—both variables are essential in improving ones livelihoods. This study was conducted in the Province of Quezon, Philippines using face-to-face interview as the main method for data collection. The results of this study suggest that participation is beneficial to the local people as it can improve their livelihoods. Their participation increases social capital, consequently, improves their access to information and access to services.기후변화는 여러 나라와 지역의 행위자들이 행동한 것이 누적되어 야기되는 세계적 문제이다. 따라서, 기후 변화 문제를 해결하기 위해서는 여러 협력적 집단 행동이 요구된다. 이런 다층의 이해관계자들간 협력과 협동은 네트워크에 의하여 가능하다. 이는 국가와 이해관계자 사이에서 지식의 교환을 용이하게 하며 협력을 강화한다. 기후 변화 문제 해결을 위한 행동에는 이해당사자들의 협력이 필요하며 지역 공동체가 기후 변화 완화 프로젝트에 참여하는 협력 활동은 사회적 자본을 증가시켜 지역 공동체의 발전에도 기여한다. 네트워크에 기반한 사회적 관계를 통해 지역 공동체들은 더 많은 경제적 이익을 얻는 기반이 되는 자산을 확장한다. 본 연구는 맹그로브 복원 프로젝트에 지역 사회가 참여하는 것이 사회적 자본에 미치는 영향을 평가했다. 더 나아가 본 연구는 사회적 자본이 지역 주민의 정보 접근 및 서비스 접근에 미치는 영향을 분석했다. 이 연구는 필리핀 퀘존 (Quezon)에서 실시되었으며 데이터 수집을 위해서 대면 인터뷰가 수행되었다. 본 연구의 결과로는 지역 주민의 참여가 그들의 생계를 향상하는데 도움이 되며 사회적 자본을 증진하는 것으로 확인되었다. 결과적으로 지역사회의 맹그로브 복원사업 참여가 사회자본 확장을 통하여 지역주민의 정보와 서비스 접근성을 향상시키는데도 기여함을 밝혔다.1. Introduction . 1 1.1. The Problem and Rationale of the Study . 1 1.2. Research Objectives. 3 1.3. Research Questions and Hypotheses 4 1.4. Significance of the Study 4 2. Literature Review . 5 2.1. The Philippine Mangroves 5 2.2. Peoples Involvement in Forest Management . 6 2.3. Social Capital 9 2.4. Factors Affecting Social Capital . 11 2.5. The Global Problem and the International Networking 15 3. Methodology . 19 3.1. Conceptual Framework 19 3.2. Theoretical Framework . 20 3.3. The Research Area and the Peoples Organization 22 3.4. Data Collection . 25 3.5. Sampling Method . 25 3.6. Measuring Social Capital . 26 3.7. Data Analysis . 32 4. Results 37 4.1. Socio-Demographic Characteristics . 37 4.2. Descriptive Statistics . 39 4.3. Statistical Results . 45 5. Discussion . 47 5.1. Impacts of participation to social capital 47 5.2. Social capital and access to information. 49 5.3. Social capital and access to services 51 6. Conclusion . 53 6.1. Summary and Key Findings . 53 6.2. Issues Remaining and Suggestions for Further Studies 54 7. Bibliography 56 9. Appendices 69 9. 국문 초록 . 75 10. Acknowledgement . 76Maste