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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 135 for “"weight distribution"”.
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Additive Manufacturing of Commercial Polypropylene Grades of Similar Molecular Weight and Molecular Weight Distribution
… of commercial PP grades, of similar molecular weight (MW) and molecular weight distribution (MWD), on printability is still to be investigated. Those commercial PP grades can have wide variation in properties such as Melt Flow Index (MFI), additive content, and polymer architecture which can …
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A study of the relation between molecular weight distribution and mechanical properties of polyvinyl alcohol
… between mechanical properties and molecular weight distribution of polyvinyl alcohol was carried out. The polyvinyl alcohol was fractionated with respect to degree of polymerization (D.P.) by precipitation of the fractions from 2% solution in water with a n-propyl alcohol-water nonsolvent. …
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UNDERSTANDING THE MOLECULAR WEIGHT DISTRIBUTION SHAPE-PROPERTY RELATIONSHIP BASED ON LINEAR UNIMODAL AND BIMODAL POLYETHYLENES MODEL SYSTEM
Molecular weight distribution (MWD) shape is crucial in determining the properties of polymers. Previous studies on comparison of the unimodal and bimodal MWD shape without controlling dispersity, chain branching, phase separation or average molecular weight make it hard to decouple the independent …
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Blinded, randomized, placebo-controlled study of the efficacy of bupivacaine liposomal suspension using static body weight distribution and subjective pain scoring in dogs after tibial plateau leveling osteotomy (TPLO) surgery
… (CMPS-SF) pain scores were assigned and using a weight distribution platform, static body weight distribution (%BW[subsctipt dist]) to the operated limb was measured. Postoperatively, dogs also received carprofen 2.2 mg/kg subcutaneously every 12 hours. Rescue analgesia was provided. Treatment …
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Effects of Two Backpack Weight Distributions on Perceptual and Physiological Measures During Walking
Backpack weight distribution may affect economy by conserving energy and thus potentially prolonging fatigue. Research has not however examined effects of backpack weight distribution on subjective measures of intensity and comfort. Heart rate (HR) and overall and differentiated Ratings of …
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Dynamics of Flow-Induced Structure Formation in Drag Reducing Polymer Solutions
… on the effects of strong shear on the molecular weight stability finds small degradation in the polymers' average molecular weight and molecular weight distribution. Experiments with HPAM and PAM solutions in a large channel flow loop at Re ≥ 20,000 provide evidence of the importance of chain …
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Bone health and fracture risk among peripubertal and adolescent children. Importance of body weight, distribution of adipose tissue and the presence of metabolic abnormalities // Костно здраве и фрактурен риск сред деца в перипубертетна и юношеска възраст – значение на телесното тегло, разпределението на мастната тъкан и наличието на метаболитни отклонения
… increase in the percentage of those who were overweight/obese, especially in girls. In severely obese girls, the amount of fat mass in the arm region exceeds that of muscle mass, which correlates strongly negatively with bone mineral content and bone area. This indicates that in overweight …
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Block copolymer characterization by gel permeation chromatography
… to propose a method to determine the composition distribution, on one hand, and the molecular weight distribution, on the other hand, for block copolymers. The technique selected to determine this kind of information was Gel Permeation Chromatography, because, since its introduction in 1964, it …
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A Systems Approach to the Modeling and Control of Molecular, Microparticle, and Biological Distributions
… in which the output variable takes the form of a distribution: molecular, microparticle, and biological distributions. This approach involves incorporation of sensor technology and experiments, model identification, simulation algorithm development, parameter sensitivity analysis, parameter …
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The cationic ring-opening polymerization of cyclic ethers
… chromatography studies showed that the molecular weight distribution of the samples of polyoxetanes were bimodal. This was in accordance with previous work establishing that the cyclic tetramer is found in much higher proportions than any of the other cyclic oligomers. However the molecular weight …
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A study of the overall internal dynamic mode of poly(ethylene oxide) in methanol with and without lithium perchlorate
… internal relaxation mode of high molecular weight, narrow molecular weight distribution PEO in methanol with and without the presence of LiClO 4 is so difficult as to be impractical. Moreover, PCS analysis proved to be extremely sensitive to small differences in data quality which further …
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Study of Neem bark tannins for the leather industry
… by HPLC on Lichrosorb RP8 column. The molecular weight distribution ranges between 250 and 5500 and the average molecular weight distribution was found to be 1550 by gel permeation chromatography. Gas chromatography-mass spectroscopy demonstrated the complex nature of NBT molecular masses consist …
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Optimal Codes and Entropy Extractors
… the total variation distance between the uniform distribution and the probability mass function of a random number generator with the weight distribution of the linear code associated to the linear extractor. Finally, we present a collection of results derived while pursuing a way to classify …
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Neural network security and optimization for single-person authentication using electroencephalogram data
… authenticated. Data on the change in entropy of weight values of the networks after training was also collected for the purpose of determining patterns in weight distribution. Results from a set of ablated networks to a set of baseline (non-ablated) networks for five targets chosen randomly from …
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Synthesis, characterization and kinetic investigations of heterophase materials prepared using group transfer polymerization
… range. The degree of control over molecular weight and molecular weight distribution rivals that afforded through living anionic techniques for the preparation of poly(alkyl methacrylate)s. The objectives of this research were many fold. The first was to establish GTP as a routine synthetic …
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The sol-gel polymerization of octamethoxysilsesquioxane
… suggested that an extremely broad molecular weight distribution of silicate polymers was produced. These findings were consistent with predictions based on a covalent network theory of silica gelation (Flory-Stockmayer) theory.
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Synthesis and Characterization of Tailored Photoactive Macromolecules
… gain the ability to reversibly control molecular weight and crosslink density using UV light. The cinnamates and coumarins were reacted onto the polymers via multiple reaction pathways. Polymers were functionalized with coumarin or cinnamate groups via an esterification reaction between hydroxyl …
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Computational Studies of Polyetherimides: Beyond All-Atom Molecular Dynamics Simulations
… polyetherimides and to compute their molecular weight distribution for a wide range of systems, including fully reacted, partially reacted, stoichiometric, and nonstoichiometric ones. The MC results are compared to the predictions of the Flory-Stockmayer theory of branched polymers and an …
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Polymer structure and property studies in elongational rheology, spherulite deformation, and biaxial strain induced crystallization
… polyethylene was sensitive to both molecular weight distribution and shear modification. The effects of molecular weight distribution and shear modification were rationalized from a molecular point of view. A model is proposed which is based on the concept of a molecular network and …
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The Structural Design, Validation, and Fabrication of an Electric Drift Trike
… Characteristics such as frame geometry and weight distribution affect the overall performance of the vehicle. Functional requirements are set in order to ensure drift capability and rider safety. These design criteria inform the overall design and geometry of the frame, and preliminary …
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