搜索结果: 1-15 共查到“工学 Melt”相关记录30条 . 查询时间(0.093 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...
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 ...
The Water Supply Department of the Vienna City Council (MA31) operates a number of water supply catchments in a
Karstic region of the Alps some 80 km south west of Vienna where the springs are fed by...
STUDYING GLACIAL MELT PROCESSES USING SUB-CENTIMETER DEM EXTRACTION AND DIGITAL CLOSE-RANGE PHOTOGRAMMETRY
Close-range photogrammetry Glacier roughness DEM extraction Geomorphology
2014/4/28
Glaciers are sensitive to climatic variation and a particular developing area of investigation is in the field of "cryoconite”, referring to dustlike residues which form on the glacier surface. Cryoco...
Simulation of snow distribution and melt under cloudy conditions in an Alpine watershed
Simulation snow distribution melt under cloudy conditions an Alpine watershed
2013/9/2
An energy balance method and remote-sensing data were used to simulate snow distribution and melt in an alpine watershed in northwestern China within a complete
snow accumulation-melt period. The spa...
Morphological Investigation of Foamed Aluminum Parts Produced by Melt Gas Injection
Morphological Investigation Foamed Aluminum Parts Melt Gas Injection
2009/9/2
Porous metal materials are a new class of materials with low densities, large specific surface, and novel physical and mechanical properties. Their applications are extremely varied: for light weight ...
The Glass-Coated Melt Spinning of Gold Filaments.
Properties of Melt and Thermal Processes during Solidification in Jewellery Casting
Melt Thermal Processes Jewellery
2009/7/29
A survey is made of the significant thermal properties pertaining to liquid and solidifying jewellery alloys,and some properties of the investment are also considered. Values found in the literature, ...
Simulation of Multifilament Semicrystalline Polymer Fiber Melt-Spinning
Computer modeling Semi-crystalline polymer Multifilament Melt-spinning
2009/7/21
The goal of this effort is to provide an accurate simulation of multifilament fiber melt spinning, applicable for a wide range of material and process conditions. For ease of use, the model should run...
Mathematical Modelling of the Pneumatic Melt Spinning of Isotactic Polypropylene. Part III. Computations of the Process Dynamics
melt blowing air-drawing nonwovens polypropylene modelling
2009/6/17
Computer simulation of the pneumatic melt spinning of isotactic polypropylene based on the mathematical model of the process is presented. Two dynamic zones of the air jet-filament interactions along ...
Mathematical Modelling of the Pneumatic Melt Spinning of Isotactic Polypropylene. Part II. Dynamic Model of Melt Blowing
melt blowing of nonwovens modelling of melt air-drawing dynamic functions in melt air-drawing
2009/6/15
Mathematical Modelling of the Pneumatic Melt Spinning of Isotactic Polypropylene. Part II. Dynamic Model of Melt Blowing.
Melt-Electrospinning of Polypropylene/Poly(ethylene-co-vinyl alcohol) Core/sheath Composite Fibers
Polypropylene Poly (ethylene-co-vinyl alcohol) Melt-electrospinning Laser melting
2009/4/13
Rodlike samples were made from Polypropylene (PP)/Poly(ethylene-co-vinyl alcohol) (EVOH) core/sheath composite fibers. From these rodlike samples, ultra thin fibers were produced using a melt-electr...