water activity

基本解释

Both rovers have now found evidence of past water activity on the planet, NASA announced last week.
上周美国宇航局宣布，两辆火星车现在都已经发现火星上曾经有水存在的证据。
Scientists believe water activity affected this plateau after the formation of the nearby canyons. Although the source of water and sediment remains uncertain.
科学家相信，在附近峡谷形成之前这片高原受到过水的影响，虽然水源和泥沙的问题仍不明朗。
"The stability against freezing of Martian fluids can explain saline water activity on the surface of Mars at mean global temperatures well below 273 Kelvin," they wrote.
他们写道，“稳定对火星流体冻结还可以可以解释在全球平均气温远低于273开尔文下火星表面的盐水活动。”

"Kids really get engaged in science in the garden where it's a kind of fun activity where they're collecting data and seeing how different temperatures will change the amount of water that's needed by a crop, so the science concepts come easily."

Water can be easily stored and consumers have less discretion over when they use it (for instance, people cannot defer going to the toilet, which uses more water than any other activity at home), so the case for smart water meters is weaker.
ECONOMIST: Utilities are getting wise to smart meters and grids
Don't be surprised if it stops counting water as a core activity—and eventually sells what it has spent so much to buy.
ECONOMIST: Water industry
However, both are now seriously threatened by deforestation and invasive practices, including intensive mining and logging, extensive livestock activity, water pollution, degradation of headwaters, unregulated processes of urban settlement, construction of roads, waterways and dams, drainage and diversion of rivers, burning of forests and illegal fishing and trade in wildlife.
UNESCO: Intangible Cultural Heritage

水分活度
Texture analyzer was used to measure the texture properties of sleeve-fish chips with combination of sensory evaluation,to explore the effect of the result of the texture properties under the different water content and water activity.
采用物性仪对鱿鱼片的质构进行分析,结合感官评定,探讨在不同水分含量和水分活度下鱿鱼片物性的影响。
水活性
Two trials were carried out to study the water activity adsorption isotherms and laws in quality change of four moulding feedstuffs.
试验分为水活性等温吸附曲线研究和霉变后品质变化规律研究两个部分。
水分活性

水分活度
On the conditon of the same water activity, glycerol, sorbitol and trehalose could enhance water content.
在水分活度相同的情况下,甘油、山梨醇和海藻糖均可以提高水分含量。
水活度
Several factors,such as initial water activity,temperature,time and ratio of substrates had been investigated in the esterification. Salt hydrate pairs were used to control the water activity in the system.
考察了初始水活度、温度、时间、底物配比等因素对淀粉酯合成的影响,用水合盐进行了体系水分的调控。
水的活度

水活度
Effects of various reaction parameters, such astype of solvent and acyl donor, enzyme loaded, water activity, time andtemperature, on the substrate conversion as well as regioselectivity werestudied.
考察了非水相介质中吡哆醇区域选择性酰化的特点,从溶剂、酰基供体、反应时间、反应温度、酶用量及体系水活度等方面对反应条件进行了全面的优化。
能源科学技术
活度