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  • 1
    Language: English
    In: Polymer Engineering & Science, November 2010, Vol.50(11), pp.2106-2113
    Description: In this work, the fracture and failure behavior of self‐reinforced polypropylene composites (SRPPC) was studied. As reinforcement woven fabric, whereas as matrix materials α and β crystal forms of isotactic polypropylene (PP) homopolymer and random PP copolymer (with ethylene) were used. Composite sheets were produced by a film‐stacking method and compression molded for constant holding time and at constant pressure but at different processing temperatures to obtain SRPPC sheets with different consolidation quality. The failure behavior of tensile specimens was assessed by the acoustic emission (AE) technique and the typical failure behavior was deduced for the differently consolidated composites. Both the number of AE events and the shape of the cumulative AE events versus deformation curve depend on the adhesion between phases. Correlations between the dominant failure mechanisms and AE events amplitude for model specimens were established which can be used to monitor the damage growth process in SRPPCs. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers
    Keywords: Polypropylene -- Mechanical Properties ; Polypropylene -- Testing ; Reinforced Plastics -- Mechanical Properties ; Reinforced Plastics -- Composition ; Reinforced Plastics -- Testing ; Fracture (Materials) -- Research ; Failure Mode And Effects Analysis -- Research ; Acoustic Emission Testing -- Methods;
    ISSN: 0032-3888
    E-ISSN: 1548-2634
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  • 2
    Language: English
    In: American Journal of Occupational Therapy, 07/01/2017, Vol.71(4_Supplement_1), p.7111505139p1
    ISSN: 0272-9490
    Source: CrossRef
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  • 3
    Language: English
    In: Journal of Strength and Conditioning Research, July, 2014, Vol.28(7), p.1875(14)
    Description: The purpose of this study was to examine the relationship between [??][O.sub.2]max and acute resistance exercise performance and the acute metabolic effects of exercise sequencing. Seventeen resistance-trained men were tested for [??][O.sub.2]max and 1 repetition maximum (1RM) strength. Subjects were randomly assigned to either a group that performed the squat first in sequence followed by the bench press (S; n = 8) or a group that performed the bench press first followed by the squat (BP; n = 9). Each group performed 3 protocols (using 1-, 2-, or 3-minute rest intervals [RIs] between sets in random order) consisting of 5 sets of each exercise with 75% of their 1RM for up to 10 repetitions while oxygen consumption was measured. Total repetitions completed were highest with 3-minute RI and lowest with 1-minute RI. Mean [??][O.sub.2] was significantly highest with 1-minute RI and lowest using 3-minute RI. Analysis of each exercise revealed a tendency (p = 0.07) for mean bench press [??][O.sub.2] to be higher when it was performed after the squat using 1- and 2-minute RIs. [??][O.sub.2]max was significantly negatively correlated to 1RM bench press and squat (r = -0.79 and -0.60, respectively) and was significantly correlated to squat repetitions (r = 0.43-0.57) but did not correlate to bench press performance. It seems that [??][O.sub.2]max is related to lower-body resistance exercise performance when short RIs are used, and the metabolic response to the bench press is augmented when it follows the squat in sequence using short RIs. KEY WORDS squat, bench press, resistance training, oxygen consumption
    ISSN: 1064-8011
    Source: Cengage Learning, Inc.
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  • 4
    Language: English
    In: Journal of Thermal Analysis and Calorimetry, 2010, Vol.101(1), pp.255-263
    Description: In our present study, the reprocessability of a self-reinforced PP composites (SRPPC) prepared by compression molding was studied. The composite materials (handled separately, based on the related matrix material) were ground, then extruded five times and injection molded after the first and fifth cycle in order to investigate the behaviour of the material during reprocessing. As a reference, the matrices of the composites were also reprocessed and injection molded similarly to the composites. On the manufactured specimens, static (tensile and flexural) and dynamic mechanical tests (Charpy) were performed. The melting and crystalline characteristics were studied by Differential Scanning Calorimetry (DSC). The probable decomposition caused by multiple extrusions was followed by the Melt Volume Rate (MVR). The results indicated that in case of commercial materials there is no significant degradation even after multiple reprocessing cycles; therefore, the reprocessability of SRPPC products has no hindrance. The presence of α-iPP reinforcement in the rPP-based composites after reprocessing results in increased inclination for crystallization and consequently leads to improved mechanical stiffness compared to rPP neat matrices.
    Keywords: iPP ; Reprocessing ; Self-reinforced composite ; β-PP
    ISSN: 1388-6150
    E-ISSN: 1572-8943
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  • 5
    In: Journal of Strength and Conditioning Research, 2014, Vol.28(7), pp.1875-1888
    Description: ABSTRACT: Ratamess, NA, Rosenberg, JG, Kang, J, Sundberg, S, Izer, KA, Levowsky, J, Rzeszutko, C, Ross, RE, and Faigenbaum, AD. Acute oxygen uptake and resistance exercise performance using different rest interval lengths: The influence of maximal aerobic capacity and exercise sequence. J Strength Cond Res 28(7): 1875–1888, 2014—The purpose of this study was to examine the relationship between V[Combining Dot Above]O2max and acute resistance exercise performance and the acute metabolic effects of exercise sequencing. Seventeen resistance-trained men were tested for V[Combining Dot Above]O2max and 1 repetition maximum (1RM) strength. Subjects were randomly assigned to either a group that performed the squat first in sequence followed by the bench press (S; n = 8) or a group that performed the bench press first followed by the squat (BP; n = 9). Each group performed 3 protocols (using 1-, 2-, or 3-minute rest intervals [RIs] between sets in random order) consisting of 5 sets of each exercise with 75% of their 1RM for up to 10 repetitions while oxygen consumption was measured. Total repetitions completed were highest with 3-minute RI and lowest with 1-minute RI. Mean V[Combining Dot Above]O2 was significantly highest with 1-minute RI and lowest using 3-minute RI. Analysis of each exercise revealed a tendency (p = 0.07) for mean bench press V[Combining Dot Above]O2 to be higher when it was performed after the squat using 1- and 2-minute RIs. V[Combining Dot Above]O2max was significantly negatively correlated to 1RM bench press and squat (r = −0.79 and −0.60, respectively) and was significantly correlated to squat repetitions (r = 0.43–0.57) but did not correlate to bench press performance. It seems that V[Combining Dot Above]O2max is related to lower-body resistance exercise performance when short RIs are used, and the metabolic response to the bench press is augmented when it follows the squat in sequence using short RIs.
    Keywords: Oxygen – Health Aspects ; Weight Training – Health Aspects ; Biomechanics – Research ; Metabolism – Research;
    ISSN: 1064-8011
    E-ISSN: 15334287
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  • 6
    Language: English
    In: Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians, September 2014, Vol.45(3), pp.638-41
    Description: A 1-yr-old female Canada lynx (Lynx canadensis) presented for sudden onset of rapidly progressive bilateral pelvic limb paralysis. The lynx was chemically immobilized to perform a physical examination but expired shortly thereafter. On postmortem radiographs, there were myriad small irregular, round-to-spherical gas densities within the skeletal muscle of the right thigh and epaxial musculature. At gross necropsy, the muscles of the right thigh, right lateral abdominal wall, and epaxial region were emphysematous and necrohemorrhagic, with subcutaneous and muscular crepitant swelling. Multiple skin puncture wounds, consistent with bites, were present over the affected tissues. Clostridium septicum was isolated in pure anaerobic culture from the musculature of the right hind limb. Histopathologic examination confirmed the diagnosis of acute, severe necrohemorrhagic and gangrenous myositis and cellulitis. Gram stains demonstrated large gram-positive bacilli with subterminal spores. This is the first known documented case of C. septicum myonecrosis in a nondomestic felid.
    Keywords: Clostridium Septicum ; Lynx ; Clostridium Infections -- Veterinary ; Muscular Diseases -- Veterinary
    ISSN: 1042-7260
    E-ISSN: 19372825
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  • 7
    Language: English
    In: Express Polymer Letters, 2010, Vol.4(4), pp.210-216
    Description: The long-term viscoelastic behaviour of self-reinforced polypropylene composites (SRPPC) was studied by short-term flexural creep tests at different temperatures. As reinforcement a fabric, woven from highly stretched split PP yarns, whereas as matrix materials α and β crystal forms of isotactic PP homopolymer and random copolymer (with ethylene) were selected and used. The composite sheets were produced by film-stacking method and compression moulded at different processing temperatures (5, 20, 35°C above the melting temperatures of the matrices) keeping the holding time and pressure constant. The manufactured specimens were subjected to isothermal creep tests at different temperatures ranging from –20 to 80°C under an applied load. The time-temperature superposition principle was verified for the creep data. An Arrhenius type relationship described the shift data obtained from the creep tests. It was found, that with improving consolidation (increasing processing temperature) the creep compliance decreased and good correlation was found between creep compliance and density/peel strength.
    Keywords: Chemistry;
    ISSN: 1788618X
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  • 8
    Language: English
    In: Journal of the American Association for Laboratory Animal Science : JAALAS, November 2014, Vol.53(6), pp.675-83
    Description: Butorphanol and buprenorphine are common analgesics used in laboratory mice. Inadvertent attenuation of the antinociceptive effects of these analgesics via the administration of an anesthetic reversal agent could result in postprocedural pain and distress, with subsequent negative effects on animal welfare, study outcomes, and regulatory compliance. This study was undertaken to determine whether atipamezole reverses ketamine-dexmedetomidine anesthesia and alters the antinociceptive effects of butorphanol and buprenorphine in female C57BL/6J mice. Atipamezole reliably reversed the anesthetic effects of ketamine-dexmedetomidine, and mice were ambulatory 17.4 ± 30.6 min after administration of the α2-adrenoreceptor antagonist. Atipamezole alone had no significant effect on tail-flick latency and did not alter the antinociceptive properties of butorphanol or low-dose (0.05 mg/kg) or high-dose (0.1 mg/kg) buprenorphine in female C57BL/6J mice. After reversal of ketamine-dexmedetomidine anesthesia, tail-flick latency at 30, 60, and 150 min after analgesic treatment differed significantly between mice treated with atipamezole alone and those given atipamezole followed by butorphanol or high-dose buprenorphine. These results suggest that the analgesic effects of butorphanol and buprenorphine are not affected by atipamezole. Buprenorphine (0.1 mg/kg) administered 30 min prior to or at the time of anesthesia resulted in a greater magnitude of antinociception after antagonism of anesthesia than when given at the time of reversal. Given these results, we recommend the use of ketamine-dexmedetomidine anesthesia with buprenorphine administered either preemptively or at the time of anesthetic induction to provide a defined period of surgical anesthesia that is effectively reversed by atipamezole.
    Keywords: Mice ; Adrenergic Alpha-2 Receptor Antagonists -- Administration & Dosage ; Anesthesia -- Veterinary ; Imidazoles -- Administration & Dosage
    ISSN: 1559-6109
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  • 9
    Language: English
    In: Veterinary Anaesthesia and Analgesia, January 2017, Vol.44(1), pp.133-137
    Description: To describe an ultrasound-guided approach for venous and arterial vascular access and catheterization in anesthetized adult Yorkshire cross-bred pigs. Prospective experimental study. Ten adult female Yorkshire cross-bred pigs, weighing 78.4 ± 5.6 kg (mean ± standard deviation). Using ultrasound guidance and the Seldinger technique, a 7 Fr, 20 cm triple-lumen central venous catheter was placed in the external jugular vein and an 18 gauge, 16 cm catheter was placed in the femoral artery. The success rate of catheterization and the incidence of catheter patency over 24 hours of general anesthesia were recorded. Catheterization of the external jugular vein was successful in 10 out of 10 pigs and catheterization of the femoral artery was successful in eight out of 10 pigs. A surgical dissection technique on the femoral artery was performed in two pigs. Venous and arterial catheter patency was maintained in all pigs over the 24 hour study period. Ultrasound guidance resulted in success rates of 100% for catheterization of the external jugular vein and 80% for catheterization of the femoral artery in anesthetized adult Yorkshire cross-bred pigs. This technique is a noninvasive, easily performed alternative to surgical exposure of the vessels in large pigs undergoing surgical instrumentation for biomedical device testing.
    Keywords: Catheterization ; Pig ; Technique ; Ultrasound ; Vascular Access ; Veterinary Medicine
    ISSN: 1467-2987
    E-ISSN: 1467-2995
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  • 10
    In: Vestnik Volgogradskogo gosudarstvennogo universiteta. Serija 10. Innovatcionnaia deiatel’nost’, 3/2014, Issue 1, pp.16-25
    Description: The article studies the properties of calcium stearate (CaSt2) and lubricants produced on its basis. These lubricants were prepared using sodium stearate and calcium chloride by subsidence from aqueous solutions. The CaSt2 and the light fraction of crude oil were mixed together to obtain lubricating substances. The article shows that CaSt2 had the melting temperature of 142.8 C that is higher than the melting temperature of crude oil (128 C). The compositions of obtained lubricants were studied with optical microscopes. The article shows that the sizes of dispersed particles amount to 1.88 mcm and 0.11 mcm for lubricants having 1 % and 2 % CaSt2 concentration, respectively. As a result of wear trials, it was shown that the friction and wear coefficients of crude oil amounted to 0.099 and 1402 nm, respectively. For the lubricant with 1 % CaSt2 concentration, these coefficients were reduced to 0.0730 and 627.61 nm. Lower wear coefficient (540 nm) was obtained for the lubricant with 2 % CaSt2 concentration. The CaSt2 improved the lubricating property of crude oil but did not improve its oxidative and thermal stability.
    Keywords: Engineering;
    ISSN: 23057815
    Source: CrossRef
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