نتایج جستجو برای: dmta analysis
تعداد نتایج: 2824300 فیلتر نتایج به سال:
The La Quina 5 Neandertal individual, dated to late Marine Isotope Stage (MIS) 4 or early MIS 3, lived during a particularly cold and arid Ice Age interval, hunting mostly reindeer in open steppe habitats. Stable isotopes indicate the importance of hunted resources for Neandertals, although evidence plant use also has been discovered. To address food signature diet 5, we marshal multiple method...
پیدایش محیط هایی با قدرت نفوذ زیاد هم زمان با وجود سیالاتی با قدرت تخریب سامانه های پلیمری، باعث شده است تا قطعه هایی که در تماس با چنین محیط هایی قرار می گیرند، به سرعت تغییرشکل داده یا ازهم پاشیده شوند. از این رو، امروزه نیاز به موادی با مقاومت در برابر نفوذ سیالات توجه را به خود معطوف کرده است. در این مقاله، اثر افزایش بلورهای لایه ای گرافیت و رزین فنولی در نانوکامپوزیت نیتریل - ن...
Abstract In the present work, the influence of formulation changes obtained by different compositions of double-base and modified double-base propellants, on the relaxation behavior was investigated using the dynamic-mechanical analysis techniques. In order to identify the dynamic-mechanical behavior and characterize the type of different relaxations and triple transition temperatures in...
Alternating copolyesteramides (APEA's) consisting of mixtures of 1,4-butyleneterephthalamide ester (N,N'bis(p-carbomethoxybenzoyl) diaminobutane) and 1,4-butyleneisophthalamide ester (N,N'-bis(m-carbomethoxybenzoyl) diaminobutane) polymerized with ethanediol were synthesised in an ethanediol solution. The bisesterdiamides were prepared from 1,4-butanediamine and dimethyl terephthalate or dimeth...
Generally, to produce film-type thermoplastic composites with good mechanical properties, high-performance reinforcement films are used. In this case, films used as a matrix are difficult to impregnate into tow due to their high melt viscosity and high molecular weight. To solve the problem, in this paper, three polypropylene (PP) films with different melt viscosities were used separately to pr...
Sol-gel technology is increasingly being used in coatings for corrosion protection and adhesion improvement. So far, the self-healing concept in sol-gel coatings has only been approached from extrinsic healing perspective (i.e. use of nano and micro carriers of corrosion inhibitors) [1]. Despite the benefits of this approach, the damaged area remains open to ambient environment. The implementat...
The performance of pretensioned, laminated, unidirectional (UD), carbon fiber reinforced polymer (CFRP) straps, that can potentially be used for example as bridge deck suspender cables or prestressed shear reinforcements concrete slabs and beams, was investigated at elevated temperatures. This paper aims to elucidate the effects temperature specifically on tensile pin-loaded straps. Two types t...
Adhesives provide a needle-free method of wound closure and do not require local anaesthetics. Polymeric adhesives have been used for about 3 decades for joining several tissues of the organism. Also, they can accomplish other tasks, such as haemostasis and the ability to seal air leakages and have the potential to serve as delivery systems. PCL was modified with 2-isocyanatoethylmethacrylate t...
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