农业信息化与农村贫困群体能力建设

农业信息化具有高投入性、开放性、高效性、差异性、挑战性等特点。我国农业信息化与国外发达国家相比有明显差距。推进农业信息化能解决物质贫困、信息贫困问题和提高农民的信息能力,推进农业信息化与农村贫困群体能力建设是相辅相成的辨证关系。开展农村贫困群体能力建设可以从基础设施、个体能力、群体能力以及营造良好的农业信息化环境等方面入手。     

Theoretical analysis of the melt spinning process of poly(trimethylene terephthalate) fibers

Profiles development of the melt spinning process of poly(trimethylene terephthalate) (PTT) was simulated by a numerical method. The spinning speed of 3 km/min to 5 km/min was analyzed and the characteristic of PTT spinning process was compared with that of poly(ethylene terephthalate) (PET). Velocity development of PTT was slower than that of PET. Although PTT’s spinning temperature was lower than PET’s, the PTT solidified slower because of a smaller super-cooling and the large specific heat capacity. The diameter profile of PTT decreases gradually in comparison with that of PET. PTT’s strain rate has a broader distribution than PET’s and its maximum ranged from 541 to 570 s⁻¹ for PET and 136 to 149 s⁻¹ for PTT. PTT’s tensile stress was smaller than PET’s.     

我国玉米生物学研究进展

玉米是我国当前种植面积较大，总产量较高的重要粮食作物，在保障我国粮食安全的重大战略中占有重要地位。近年来，我国玉米生物学研究取得了重大进展，发表了一系列有重要影响的研究成果。从玉米基因组学、雄性不育遗传调控、玉米株型遗传调控、玉米籽粒发育遗传调控、玉米单倍体育种技术、玉米抗生物胁迫遗传调控、玉米抗非生物胁迫遗传调控、玉米种质资源相关基础、玉米分子遗传研究技术和平台共9个方面对近3年来我国玉米生物学的研究进展进行了总结，以期为今后玉米分子育种研究提供思路和参考。