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Study on the Light No-till Seeders With High Anti-blockage Performance
Gao Huanwen,Li Hongwen,Yao Zonglu
Strategic Study of CAE 2007, Volume 9, Issue 9, Pages 35-39
The first performance of the no -till seeder is to avoid the stalk blockage To solve the blockage problem, oversea no-till seeders mostly rely on heavy weight (760-1130From 1998, 3 types of light and active anti-blockage no-till seeders, strip rotary hoe, &The price is 1/8 of oversea no-till seeders.no-till seeders have shown more soil disturbance and power consuming than oversea no-till seeders, &
Keywords： active anti-blockage no-till seeder light seeder conservation tillage direct seeding wheat
Theory and Practice of Space Medico-engineeringChen Shanguang
Chen Shanguang
Strategic Study of CAE 2007, Volume 9, Issue 9, Pages 30-34
Space Medico-Engineering is a newly emerged subject with its own characteristic theoretical system and technological methods. With 40 years′ development and practice of manned space flight in China, it gradually comes into being. This paper briefly introduces its concept, system structure, research content and characteristics.
Keywords： active anti-blockage no-till seeder light seeder conservation tillage direct seeding wheat
Simiao Chen, Qiushi Chen, Weizhong Yang, Lan Xue, Yuanli Liu, Juntao Yang, Chen Wang, Till Bärnighausen
Engineering 2020, Volume 6, Issue 10, Pages 1108-1114 doi: 10.1016/j.eng.2020.07.018
Rapid responses in the early stage of a new epidemic are crucial in outbreak control. Public holidays for outbreak control could provide a critical time window for a rapid rollout of social distancing and other control measures at a large population scale. The objective of our study was to explore the impact of the timing and duration of outbreak-control holidays on the coronavirus disease 2019 (COVID-19) epidemic spread during the early stage in China. We developed a compartment model to simulate the dynamic transmission of COVID-19 in China starting from January 2020. We projected and compared epidemic trajectories with and without an outbreak-control holiday that started during the Chinese Lunar New Year. We considered multiple scenarios of the outbreak-control holiday with different durations and starting times, and under different assumptions about viral transmission rates. We estimated the delays in days to reach certain thresholds of infections under different scenarios. Our results show that the outbreak-control holiday in China likely stalled the spread of COVID-19 for several days. The base case outbreak-control holiday (21 d for Hubei Province and 10 d for all other provinces) delayed the time to reach 100 000 confirmed infections by 7.54 d. A longer outbreak-control holiday would have had stronger effects. A nationwide outbreak-control holiday of 21 d would have delayed the time to 100 000 confirmed infections by nearly 10 d. Furthermore, we find that outbreak-control holidays that start earlier in the course of a new epidemic are more effective in stalling epidemic spread than later holidays and that additional control measures during the holidays can boost the holiday effect. In conclusion, an outbreakcontrol holiday can likely effectively delay the transmission of epidemics that spread through social contacts. The temporary delay in the epidemic trajectory buys time, which scientists can use to discover transmission routes and identify effective public health interventions and which governments can use to build physical infrastructure, organize medical supplies, and deploy human resources for long-term epidemic mitigation and control efforts.
Keywords： COVID-19 Model Lunar New Year holiday Extension Social distancing
Title Author Date Type Operation
Study on the Light No-till Seeders With High Anti-blockage Performance
Gao Huanwen,Li Hongwen,Yao Zonglu
Journal Article
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