268 research outputs found
Does exchange rate policy matter for economic growth? Vietnam evidence from a co-integration approach
Both economic growth and exchange rate theories suggest that the exchange rate regime could have consequences for the medium-term growth of a country, directly, through its effects on the adjustment to shocks, and indirectly, through its impact on the important determinants of growth. It is, however, surprising that there was little empirical work investigating the indirect relationship between the exchange rate policy and economics growth in the case of a specific country. In a co-integration framework, our research attempts to fill the gap by econometrically investigating the possible impacts of exchange rate regime on economic growth through two main channels - Foreign direct investment (FDI) and Exports - in the case of Vietnam - a successful example of a transitional economy.Exports, Exchange Rate, FDI, Growth, Co-integration
Sustainable Animal Productivity for Livelihoods, Nutrition and Gender inclusion in the Northwest Highlands of Vietnam
Design of freeform lens for WLEDs on the fishing boat
In this article, a free secondary lens is designed for an LED fishing/working lamp (LFWL), which is recommended for the purpose of taking the place of a traditional high-intensity discharge (HID) fishing lamp. To serve the lighting needs of fishing and the on-board activities on fishing boats, the innovative LED lamp is proposed. To make the freeform lens in our optics design process, we depended on Gaussian decomposition. In this way, it is easy to approach the targeted light intensity distribution curve (LIDC) of the LFWL lens. The simulated results show that the performance of the LED fishing/working lamps is much better than that of HID fishing lamps for illumination onboard, on the sea-surface, and underwater. Meanwhile, a lighting efficiency of 91% with the power consumption reduction of more than 50% can be achieved when the proposed LED fishing/working lamps are used instead of the HID fishing lamps
Green-emitting Gd2O2S:Tb3+ and red-emitting Y3Al5O12:Cr3+ phosphors: a suitable selection for enhancing color quality of remote phosphor structure
This article demonstrates green-emitting phosphor Gd2O2S:Tb3+ and red-emitting phosphor Y3Al5O12:Cr3+ application in the triple-layer phosphor WLED to enhance optical performance. The arrangement of phosphor layers in the WLED is red phosphor Y3Al5O12:Cr3+ on top, green phosphor Gd2O2S:Tb3+ in the middle, and yellow phosphor YAG:Ce3+ at the bottom. The principal to utilize these phosphor materials is the exploitation of additional red light component and green light component from the green and red phosphor to enrich the color rendering index (CRI) and luminous efficacy. The influences of green phosphor and red phosphor are also estimated with a new quality indicator, the color quality index (CQS). The results show red phosphor Y3Al5O12:Cr3+ enable CRI when its concentration increases while green phosphor exhibits a contrast reaction. Regarding the CQS, the optimal red phosphor concentration for CQS is from 10% to 14%, disregard the concentration in green phosphor. The improvement that applying these two phosphor materials brought comes from limiting the light loss from back-scattering and strengthen chromatic performance through addition red and green light components. These findings can support manufacturers in adapting to modern lighting requirements by improving CRI, CQS and particularly luminous efficiency to more than 40%
Adoption and impact of gaps in pig value chains: Implications for institutional policy and practice change
This paper investigates the adoption of VietGAHP, a set of guidelines for best practices
in pig production, and evaluates impacts using quantitative and qualitative indicators. It tackles
the following specific research questions: 1) What is the extent of adoption of VietGAHP
among smallholder pig producers? 2) Is there a difference in performance between VietGAHP
adopters and non-adopters? Outcomes from adoption and compliance with VietGAHP are
assessed using reduction in mortality as a metric for efficacy. Cost-benefit comparisons are
also made to illustrate economic outcomes as a measure of effectiveness. We employ statistical
t-tests for mean comparison of outcomes between VietGAHP adopters and non-adopters and
across exposed and control sites. Our study shows productivity gains from practice and
behavioral changes elicited from adoption and compliance with VietGAHP outweigh the costs
of doing so, at least at the household level. The observed economic and market incentives could
boost the adoption of VietGAHP if these incentives are sustained with appropriate institutions
in place. Scalability could be facilitated by exposure via demonstration effects. Peer-to-peer
learning is an effective strategy in enhancing capacity for uptake. With exposure being strongly
linked to uptake, regardless of gender of respondents, training opportunities for non-exposed
groups are worthwhile to pursue
Emerging gender issues in Vietnam pig value chain
Using a broad systematic literature review of peer reviewed publications and grey literature, the paper summarizes the most relevant gender issues in the pig value chain of Vietnam, and the ways in which these could be addressed. Specifically, women were found to face more severe constraints than men in accessing productive resources, markets and services. They have limited access to land use rights and therefore have limited access to resources for pig production. Besides, time constraints and cultural norms hinder women from actively participating in trainings and extension activities. Several projects/programs have been undertaken to help reduce the gender gaps. Lessons learnt from successful projects indicate that approaching women farmers via the Women’s Union is an effective way to increase the active participation of women in trainings. Identifying and providing technical trainings that meet specific needs of women farmers could lead to productivity increase. Besides, it is important to facilitate collaboration and dialogue between men and women to encourage men’s support of women’s empowerment and to improve the positive impacts of project interventions
A preliminary viability assessment of beef cattle value chains in the Central Highlands of Vietnam
Do Technical Barriers to Trade Measures Affect Vietnam’s Tea Exports? Evidence from the Gravity Model
This paper explores how technical barriers to trade (TBT) affect Vietnam’s tea exports to 55 importing countries from 2001 to 2019. We use the gravity model with different estimation methods: ordinary least square (OLS), fixed-effect (FE), and random effect (RE) to estimate the impact of TBT on Vietnam’s tea exports. The results show that although GDP, population, distance, tariff, and participation in World Trade Organization (WTO) are crucial factors, the TBT measures imposed by these importing countries have significantly negative impacts on Vietnam’s tea exports. Our findings reveal that while a 1% increase in the cumulative TBT measures imposed by developing countries decreases Vietnam's tea export by 0.341%, the figure for developed countries is 1.308%
Comparison of calcium carbonate and titania particles on improving color homogeneity and luminous flux of WLEDs
In this paper, the experiments on phosphor-converted LEDs (pc-LEDs) with a correlated color temperature (CCT) of 8500K has been conducted with the scattering enhancement particles (SEPs) to achieve the higher color uniformity and emitted luminous flux of pc-LEDs. Moreover, this paper also introduced about choosing scattering enhancement particles (SEPs), including calcium carbonate (CaCO3) and titania (TiO2), and compared these particles’ properties by adding them into the yellow Y3Al5O12:Ce3+ phosphor compounding. Afterward, the LightTools program was applied to illustrate the optical simulation, and obtained results was analyzed and verified by applying the Mie-scattering theory. The scattering coefficients, the anisotropic scattering, the reduced scattering, and the scattering amplitudes at 455 nm and 595 nm are included in the scattering computation of SEPs. According to researched results, among the SEPs, TiO2 particles result in the highest value of color uniformity. However, a rise in their concentration is the cause of a sharp decline in luminous flux. Meanwhile, CaCO3 particles show the ability of reducing the deviated level in correlated color temperature by 620K if there is employed 30% of CaCO3 concentration. Hence, CaCO3 particles are the recommendation for achieving higher chromatic homogeneity and lumen output
- …