Factors affecting the development of 'finger drop' in bananas after ripening

A simple mechanical method has been developed to measure the force required to break banana fruit peel in the region of the pedicel. Values obtained for peel breaking force correlate well with measured differences in susceptibility to 'finger drop'.
Longer periods for fruit ripening, obtained by a reduction of the conventional ripening temperature, favour maintenance of a high peel breaking force and extend the shelf life of ripe fruit but reduce the degree of coloration. Finger drop in bananas of tetraploid clones, which are highly susceptible to its development, could be minimized by ripening at temperatures about 2°C lower than those optimal for 'Valery', a major commercial triploid cultivar.
The peel breaking forces of different tetraploid clones were compared under controlled ripening and shelf life conditions and several clones with significantly reduced susceptibilities to finger drop were identified. Clones with a low susceptibility to finger drop were generally also characterized by a long pre-climacteric period.     

一种基于变结构的预测控制算法及其应用研究

将变结构控制方法引入预测控制中，提出了一种基于变结构的预测控制算法。与传统的预测控制方法相比，该算法具有设计简单、易于实现的优点。将其应用于火电机组过热汽温控制进行仿真研究，结果表明所提出的预测控制算法具有优良的控制性能和很好的鲁棒性。     

MAKING CITIES WATER-WISE AND CLIMATE-RESILIENT — LESSONS AND EXPERIENCE FROM THE CAPE TOWN DROUGHT

Half of humanity now lives in cities and the net inflow of population into cities will continue. Among all challenges faced by cities, the provisioning for water and sanitation is probably the most pressing one. From 2017 to 2018, the city of Cape Town in South Africa frequently made itself media headlines around the world, in many languages, for its severe water shortage due to consecutive years of drought that later resulted in a water crisis. Fortunately, the potential “Day Zero” when the city would run out of water, did not arrive. However, the crisis exposed a lack of resilience in the city’s water supply system in the face of ongoing climate change and a governance gap for climate adaptation. Many cities, especially those in the Global South, can learn from Cape Town’s experience and lessons on how to enhance governance to become more climate-resilient. Mark New and Gina Ziervogel, the interviewees, have been devoting themselves to studying about the Cape Town drought, and working on establishing the Cape Town Drought Response Learning Initiative. In this article, they analyzed the influence of climate change on Cape Town drought and the water supply system, and suggested effective methods to address and prevent the drought and water shortage. Ziervogel briefly described her adaptive and water-sensitive city framework while both of them revealed the role of Cape Town Drought Response Learning Initiative in making Cape Town more resilient.     

双级半导体温差电致冷障板

一、引言由于油扩散泵价格便宜、维修方便、使用寿命长,因此,许多高真空系统仍采用它来获得高真空,它的主要缺点是油蒸汽对真空系统的污染。而采用半导体温差电致冷障板,     

大中型轧机新型升降台的设计

介绍了一种适用于大中型轧机的新型升降台的结构特点、工作原理、主要参数及其选择原则.     

丹江口水电厂发电机改造

随着丹江口大坝正在加高,水电厂的4、5号发电机改造已进入实施阶段,对改造的内容和技术方案加以介绍.     

创造更大的辉煌--写在共和国诞生50周年之际

建国以来,我国的水泥工业走过了50年不平凡的历程。回顾这段翻天覆地变化的历史,我们深深体会到,50年的辉煌成就来之不易,它凝结着党和全国几代水泥工作者的心血和贡献,也为我们今天继续奋进造就了坚实的基础。 回顾过去是为了更好地开辟未来。当前,我国水泥工业的发展已经进入了历史性的转折时期,面临着新的机遇和新的挑战。我们有着建国以来的巨大成就和宝贵经验,展望21世纪的中国水泥工业,我们充满信心。