搜索结果: 1-15 共查到“melt”相关记录84条 . 查询时间(0.14 秒)
Sustainable rosin acid ester as internal electron donors in Ziegler-Natta catalysts for synthesis of isotactic polypropylene with high melt flow rate
Bio-derived rosin acid esters internal electron donors Ziegler-Natta catalyst polypropylene polymerization
2023/12/11
In this contribution, novel bio-derived rosin acid ester compounds have been developed and used as internal electron donors to prepare MgCl2?supported titanium catalysts for propylene polymerization. ...
Study on novel rosin-based polyurethane reactive hot melt adhesive
adhesion properties chain extender polyurethane reactive hot melt adhesive rosin
2023/12/11
Chain extender is a major additive in polyurethane adhesive preparation, which has a great influence on its molecular weight, green strength, and thermal resistance. In this work, we first synthesized...
The mysterious changes in phases of matter – from solid to liquid and back again – have fascinated Eun-Ah Kim since she was in lower elementary school in South Korea. Without cold drinking water readi...
How to design a sail that won’t tear or melt on an interstellar voyage（图）
星际航行 帆 机械工程 应用力学 航天器结构与设计
2023/7/11
Astronomers have been waiting decades for the launch of the James Webb Space Telescope, which promises to peer farther into space than ever before. But if humans want to actually reach our nearest ste...
Extreme melt on Antarctica's George VI Ice Shelf（图）
Extreme melt Antarctica George VI Ice Shelf
2021/3/12
Antarctica's northern George VI Ice Shelf experienced record melting during the 2019-2020 summer season compared with 31 previous summers of dramatically lower melt, a University of Colorado Boul...
Geoscientists discover ancestral Puebloans survived on ice melt in New Mexico lava tubes（图）
Geoscientists ancestral Puebloans survived ice melt New Mexico lava tubes
2020/12/11
For more than 10,000 years, the people who lived on the arid landscape of modern-day western New Mexico were renowned for their complex societies, unique architecture and early economic and political ...
Crystallization kinetics and morphology of small concentrations of cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs) melt-compounded into poly(lactic acid) (PLA) with plasticizer
Poly(lactic acid) Nucleation Nanocellulose Avrami kinetics Crystallization
2024/2/27
In the present study, very small concentrations of CNCs and CNFs were melt-compounded into PLA using a solvent-free process where poly(ethylene glycol) (PEG) was used to disperse the nanoparticles in ...
RESPONSE OF ALPINE GRASSLAND VEGETATION PHENOLOGY TO SNOW ACCUMULATION AND MELT IN NAMCO BASIN
Vegetation Greening Vegetation Growth Length Snow Cover Fraction Trend Analysis Relationship Namco Basin
2018/5/11
Snow/ice accumulation and melt, as a vital part of hydrological processes, is close related with vegetation activities. Taking Namco basin for example, based on multisource remote sensing data and the...
Extreme melt season leads to decade-long ecosystem changes in Antarctica's Dry Valleys（图）
Extreme melt season decade-long ecosystem changes Antarctica Dry Valleys
2017/9/4
An abnormal season of intense glacial melt in 2002 triggered multiple distinct changes in the physical and biological characteristics of Antarctica's McMurdo Dry Valleys over the ensuing decade, new r...
Arctic melt ponds form when meltwater clogs ice pores（图）
Arctic melt ponds meltwater clogs ice pores
2017/2/16
When spring comes to the Arctic, the breakup of the cold winter ice sheets starts at the surface with the formation of melt ponds. These pools of melted snow and ice darken the surface of the ice, inc...
Researchers from MIT, Princeton University, and elsewhere have developed a new technique to monitor the seasonal changes in Greenland’s ice sheet, using seismic vibrations generated by crashing ocean ...
Evolution of the volcanic plumbing systemof Alicudi (Aeolian Islands - Italy): evidence from fluid and melt inclusionsin quartz xenoliths
Aeolian Islands fluid inclusions crustal xenoliths homogenisation temperature magma plumbing system
2015/9/15
Quartz-rich xenoliths in lavas (basalts to andesites; 90-30 ka) from Alicudi contain abundant melt and fluid inclusions. Two generations of CO2-rich fluid inclusions are present in quartz-rich xenolit...
Volatile diffusion in silicate melts and its effects on melt inclusions
diffusion silicate melts volatiles water carbon dioxide sulfur fluorine igneous processes chlorine melt inclusion
2015/9/10
A compendium of diffusion measurements and their Arrhenius equations for water, carbon dioxide, sulfur, fluorine,
and chlorine in silicate melts similar in composition to natural igneous rocks is pre...
Warm Arctic, Cold Continents: A Common Pattern Related to Arctic Sea Ice Melt, Snow Advance, and Extreme Winter Weather
Arctic sea ice statistical model the Eurasian snow winter temperatures
2015/7/16
Arctic sea ice was observed to be at a new record minimum in September 2012. Following this summer minimum, northern Eurasia and much of North America experienced severe winter weather during the wint...
Geodynamic Models of Melt Generation and Extraction at Mid-Ocean Ridges
Geodynamic Models Melt Generation Extraction Mid-Ocean Ridges
2015/7/14
It is widely accepted that plate divergence at mid-ocean ridges drives mantle flow, mantle melting, and the formation of new oceanic crust. However, many of the details of this process remain obscure ...