Conductivity in Half-filled Ionic Hubbard Model

We calculate the temperature dependent conductivity in the half-filled ionic Hubbard model with an on-site Coulomb repulsion $U$ and an ionic energy $\Delta$ by mean of the coherent potential approximation. It is shown that for intermediate and large $\Delta$ the largest conductivity occurs near the special value $U = 2 \Delta$ at all temperatures $T$, for a fixed $\Delta$ the region of finite conductivity $[U_{c1}, U_{c2}]$ expands and its maximum decreases with increasing $T$. Our results are in good agreement with those derived from the determinant quantum Monte Carlo simulation

Properties of DMF-fossil gasoline RON95 blends in the consideration as the alternative fuel

The use of endless biomass sources form agricultural by-products for the renewable fuel synthesis has been being considered as the extremely useful works meeting the strict strategies of environment protection. In this work, 2,5-dimethylfuran (DMF) synthesized from available rice straw in Vietnam was mixing with fossil gasoline RON95 to determine and measure the key properties of DMF-gasoline RON95 blends based on corresponding ASTM standards in the consideration as a new alternative fuel for modern gasoline engines. Each 5% volume fraction of DMF was used for mixing purposes to create 21 samples with the change of DMF volume fractions from 0% to 100%. As a result, the linearization of density, octane number, and laten heat of vaporization was conducted; meanwhile, the stoichiometric air/fuel ratio, heating value, and self-ignition temperature of DMF-gasoline RON95 blends were also reported. This work provided the full properties of blends of DMF-gasoline RON95 blends based on experimental results, and of course, achieved results could be used for the next steps to investigate the applicability of DMF-gasoline RON95 blends to practical experiments or simulation studies

Public-Private Sector Wage Differentials for Males and Females in Vietnam

This study examines public administration-private wage differentials and SOEs-private wage differentials for males and females. Based on data from Vietnam Living Standards Survey in 2002 (VLSS 2002), wage equations with and without selectivity correction are estimated by sector of employment for males and females. From these results, the study compares the wage structure by sector of work for males and females. Oaxaca-Blinder decomposition of the public administration-private sector wage differentials and the State-Owned Enterprises (SOEs)-private sector wage differentials are carried out. Results, which are controlled for observed characteristics and selection bias, indicate some main points. For men, public workers are paid lower than private workers. For women, public administration wages are lower than private wages. However, SOE wages are higher than private wages for women. The wage differential is mostly due to the differential in characteristics in which public workers have richer characteristics than private workers. In these worker characteristics, education is the most important element accounting for wage differentials. Besides, there are differences in returns to characteristics by sector of work for men and for women. Furthermore, the total unexplained differential has a large contribution of the wage differential in the constant term of public administration vs. private sector and SOE vs. private sector for men and women

public-private sector wage differentials for males and females in vietnam

This study examines public administration-private wage differentials and SOEs-private wage differentials for males and females. Based on data from Vietnam Living Standards Survey in 2002 (VLSS 2002), wage equations with and without selectivity correction are estimated by sector of employment for males and females. From these results, the study compares the wage structure by sector of work for males and females. Oaxaca-Blinder decomposition of the public administration-private sector wage differentials and the State-Owned Enterprises (SOEs)-private sector wage differentials are carried out. Results, which are controlled for observed characteristics and selection bias, indicate some main points. For men, public workers are paid lower than private workers. For women, public administration wages are lower than private wages. However, SOE wages are higher than private wages for women. The wage differential is mostly due to the differential in characteristics in which public workers have richer characteristics than private workers. In these worker characteristics, education is the most important element accounting for wage differentials. Besides, there are differences in returns to characteristics by sector of work for men and for women. Furthermore, the total unexplained differential has a large contribution of the wage differential in the constant term of public administration vs. private sector and SOE vs. private sector for men and women

public-private sector wage differentials for males and females in vietnam

This study examines public administration-private wage differentials and SOEs-private wage differentials for males and females. Based on data from Vietnam Living Standards Survey in 2002 (VLSS 2002), wage equations with and without selectivity correction are estimated by sector of employment for males and females. From these results, the study compares the wage structure by sector of work for males and females. Oaxaca-Blinder decomposition of the public administration-private sector wage differentials and the State-Owned Enterprises (SOEs)-private sector wage differentials are carried out. Results, which are controlled for observed characteristics and selection bias, indicate some main points. For men, public workers are paid lower than private workers. For women, public administration wages are lower than private wages. However, SOE wages are higher than private wages for women. The wage differential is mostly due to the differential in characteristics in which public workers have richer characteristics than private workers. In these worker characteristics, education is the most important element accounting for wage differentials. Besides, there are differences in returns to characteristics by sector of work for men and for women. Furthermore, the total unexplained differential has a large contribution of the wage differential in the constant term of public administration vs. private sector and SOE vs. private sector for men and women

ベトナム共産党の正統性と国会の選挙・運営を通した民主的正統性の主張

早大学位記番号:新8375早稲田大

Outage probability analysis for hybrid TSR-PSR based SWIPT systems over log-normal fading channels

Employing simultaneous information and power transfer (SWIPT) technology in cooperative relaying networks has drawn considerable attention from the research community. We can find several studies that focus on Rayleigh and Nakagami-m fading channels, which are used to model outdoor scenarios. Differing itself from several existing studies, this study is conducted in the context of indoor scenario modelled by log-normal fading channels. Specifically, we investigate a so-called hybrid time switching relaying (TSR)-power splitting relaying (PSR) protocol in an energy-constrained cooperative amplify-and-forward (AF) relaying network. We evaluate the system performance with outage probability (OP) by analytically expressing and simulating it with Monte Carlo method. The impact of power-splitting (PS), time-switching (TS) and signal-to-noise ratio (SNR) on the OP was as well investigated. Subsequently, the system performance of TSR, PSR and hybrid TSR-PSR schemes were compared. The simulation results are relatively accurate because they align well with the theory

Outage performance analysis of non-orthogonal multiple access systems with RF energy harvesting

Non-orthogonal multiple access (NOMA) has drawn enormous attention from the research community as a promising technology for future wireless communications with increasing demands of capacity and throughput. Especially, in the light of fifth-generation (5G) communication where multiple internet-of-things (IoT) devices are connected, the application of NOMA to indoor wireless networks has become more interesting to study. In view of this, we investigate the NOMA technique in energy harvesting (EH) half-duplex (HD) decode-and-forward (DF) power-splitting relaying (PSR) networks over indoor scenarios which are characterized by log-normal fading channels. The system performance of such networks is evaluated in terms of outage probability (OP) and total throughput for delay-limited transmission mode whose expressions are derived herein. In general, we can see in details how different system parameters affect such networks thanks to the results from Monte Carlo simulations. For illustrating the accuracy of our analytical results, we plot them along with the theoretical ones for comparison