ymol timing nd rrier frequeny synhroniztion re ruil to yphw systemsF yne of the lind synhroE niztion methods is the yli prex @gA sed mxE imum likelihood @wvA symol timing nd rrier freE queny synhroniztion whih orreltes the yli prex nd the lst prt of the yphw symolF roweverD the performne of this method is seriously redued in the timeEvrint multipth hnnelF sn this pperD we proE pose new g whih hs two prtsF yne prt is opy of the hed of the lst symol nd the other prt is opy of the til of tht symolF foth prts hve the length of hlf of the gF es result of this new gD the strting time of one yphw symol is llowed to fll into its efE fetive period @the solute vlue of the symol timing error should e smller thn gGPAF he performne of yphw systems is improved signintly with this new gF
In Vietnam's education development strategy, physical education is identified as one of the important educational programs. Along with knowledge and skills education, the development of school health is one of the important activities for the comprehensive development of students. Vietnam's physical education development policy for many years has clearly shown the importance of that activity. This study points out the need to continue to improve the physical education development policy, and the practice of physical education in schools, thereby recommending solutions to improve the policy to continue developing physical education activities physical education in the future.
The Southern white-cheeked crested gibbon, Nomascus siki, is an endemic primate to Vietnam and Laos, and has been identified as a nationally and globally endangered species (EN). However, little information is known on the status of the species in Vietnam generally and in the Truong Son key biodiversity area (Truong Son KBA) particularly. In order to explore the current status of the species in the Truong Son KBA, we conducted field surveys in 2018 and 2019. Analysis of the survey data shows 149 groups of gibbon in the 4 study areas. Combined with results of similar-techniqued survey in 2016 on the same species in Khe Nuoc Trong forest, we identified at least 252 gibbon groups and estimated 425 gibbon groups in the entire Truong Son KBA. These gibbon groups are mainly distributed in medium-rich evergreen closed forests in mountainous areas of the west Truong Son KBA, adjacent to the Vietnam-Laos border.
In many places around the world, population growth and climate change have been posing huge challenges to agriculture. There are increasing demands for food products in both quantity and quality. As a result, it is essential to develop new hybrid maize varieties with high yield, quality and resistance. In this study, single-cross maize hybrid QT55 was created from a combination of two maize hybrids (D4 x D54). This hybrid maize was tested in some provinces in the North, South Central and Central Highlands of Vietnam. Study results show that in comparison with control maize cultivars, QT55 was a medium early single-cross maize hybrid (medium growth time) with the yields from 69.44 to 75.38 quintals ha -1 and ranged from 60 to 100.2 quintals ha -1 during intensive farming. Additionally, QT55 demonstrated higher resistance to stalk borer and other diseases such as the banded leaf, sheath blight and stalk rot. It is less likely to fall, cold tolerant and drought tolerant are better. Single-cross maize hybrid QT55 was best planted in Spring and Autumn-Winter crops (in Northern provinces) and Winter-Spring, Summer-Autumn crops (in South Central and Central Highlands).
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