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  • Open Access


    Study on fracture behaviors of concrete using electronic speckle pattern interferometry and finite element method

    Helen Hongniao Chen1, Ray Kai Leung Su1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.15, No.3, pp. 91-102, 2010, DOI:10.3970/icces.2010.015.091

    Abstract In this study, Electronic Speckle Pattern Interferometry (ESPI) technique was used to measure the surface displacement and strain fields around cracks in concrete beams. ESPI has high accuracy and can determine full-field deformations of concrete. However, tiny rigid-body movements of beam specimens can spoil the ESPI measurement and cause virtual deformations and false strains. Based on the theory of geometrical optics, this paper proposes a method to eliminate the false strains caused by rigid-body motion. The correction procedure was validated experimentally. Furthermore, the crack evolution in a pre-notched beam is presented. The critical minimum crack width of a microcrack is… More >

  • Open Access


    Financial early warning system model for hospitals

    A.S. Koyuncugil1, N. Ozgulbas2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.3, pp. 79-80, 2009, DOI:10.3970/icces.2009.011.079

    Abstract The aim of this study is to present the Hospital Early Warning System (HEWS) that developed for determining financial performance and risk indicators of Ministry of Health Hospitals based on automation and in an objective manner with usage of data mining.
    HEWS is an automation system based on Data Mining that hospital manager, Hospital Unions Managers in case of the constitute of hospital unions, Ministry of Health and the other needing ones will use for:
    • determining financial performance of hospitals,
    • detecting financial risks of hospitals,
    • determining financial performance indicators objectively,
    • determining early warning… More >

  • Open Access


    Establishment of the Realistic Breathing Patterns in Different Exercise Conditions by Experimental Measurement

    chun-chi Li1, chin-chiang Wang2, yin-chia Su2, yu-chen Chu2, chia-chu Weng2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.2, pp. 31-32, 2009, DOI:10.3970/icces.2009.011.031

    Abstract The aim of this paper was to establish the realistic breathing patterns in different exercise conditions by experimental measurement. Generally, the human inhalation rate varies from 15 L/min at rest to 135 L/min for intense exercise and the breathing cycles are varied with different exercise conditions. Previous author have used symmetric Weibel configuration to establish three realistic breathing patterns, i. e., resting (inhalation rate, 15 L/min), light activity (inhalation rate, 30 L/min), and moderate exercise (inhalation rate, 60 L/min). In this study, in addition to reconstructing the three realistic breathing patterns of above mention, we expand the establishment of the… More >

  • Open Access


    Kinematic Analysis of Lumbar Spine Undergoing Extension and Dynamic Neural Foramina Cross Section Measurement

    Yongjie Zhang1, Boyle C. Cheng2, Changho Oh1, Jessica L. Spehar2, James Burgess3

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.2, pp. 57-62, 2008, DOI:10.3970/icces.2008.007.057

    Abstract The spinal column plays a vital biomechanical role in the human body by providing structural support and facilitating motion. As degenerative changes occur in the spine, however, chronic pain can result which frequently forces patient to seek surgical treatment. Such treatments seek to address that pain, frequently by addressing both spinal motion and structural integrity. More >

  • Open Access


    Electromagnetic Characterization of Recyclable Polymer Nanofibers Based on PSU/Carbonyl Iron

    Daniel Cônsoli Silveira1,*, Tiago Teixeira da Silva Braga1, Daniel Molina Gil1, Newton Adriano dos Santos Gomes2, Lilia Müller Guerrini3, Edson Cocchieri Botelho1

    Journal of Renewable Materials, Vol.7, No.3, pp. 279-287, 2019, DOI:10.32604/jrm.2019.01834

    Abstract This study investigated and defined the optimal processing parameters for the electrospinning of polysulfone polymer solutions with N,N-dimethylacetamide. Variation of parameters such as solute concentration, electrical voltage, and working distance were correlated with the quality of the obtained nanofibers using morphological characterization via scanning electron microscopy (SEM). Carbonyl iron additive was dispersed in the polymer solutions, using ultrasonic tip, and the material processed via electrospinning with aforementioned parameters defined. Nanofibers with the property of interaction with electromagnetic waves were obtained. The dispersion of different concentrations of the additive and electromagnetic characterizations in the X-band of microwaves (8.2 and 12.4 GHz),… More >

  • Open Access


    Evaluation of Biodegradation in Aqueous Medium of Poly(Hydroxybutyrate-Co-Hydroxyvalerate)/Carbon Nanotubes Films in Respirometric System

    Larissa Stieven Montagna, Isabela CÉSAR Oyama, Rita de CÁSSIA Barbosa Camargo Lamparelli, Ana Paula Silva, THAÍS Larissa do Amaral Montanheiro, Ana Paula Lemes*

    Journal of Renewable Materials, Vol.7, No.2, pp. 117-128, 2019, DOI:10.32604/jrm.2019.00036

    Abstract Biodegradable polymers have been increasingly used for scientific and commercial applications because they are similar to some conventional thermoplastics and exhibit the ability of self-degradation. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanocomposites films with 1 and 2 wt% of carbon nanotubes (CNT) were prepared by solution mixing, followed by solvent evaporation. In this work, PHBV/CNT nanocomposites were submitted to biodegradation in an aqueous medium for 34 days through a respirometric system. Then, the PHBV films were analyzed by the CO2 production and mineralization as a response of a microbial attack, which was monitored by back titration during all the experiment. The films were also… More >

  • Open Access


    Novel Approaches of Using of Spirulina Platensis in Natural Rubber Based Composites

    Ewa Głowińska*, Janusz Datta, Paulina Parcheta and Natalia Kaźmierczak

    Journal of Renewable Materials, Vol.6, No.7, pp. 680-687, 2018, DOI:10.32604/JRM.2018.00003

    Abstract The aim of this work was to investigate the influence of Spirulina (Spirulina platensis) as a natural filler on the curing characterization, morphology and mechanical, thermomechanical and thermal properties of natural rubber (NR) based composites. Spirulina was introduced into NR mixture in amount of 0 phr, 10 phr and 30 phr. The vulcanization process was carried out at the determined process condition by using hydraulic press at optimum vulcanization time (t90). It was noticed that Spirulina affected on the reduction of t90, and scorch time (t2) of the NR mixtures. Obtained vulcanizates were subjected to the number of tests e.g.… More >

  • Open Access


    A fin design problem in determining the optimum shape of non-fourier spine and longitudinal fins

    Cheng-Hung Huang1,2, Hsin-Hsien Wu1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.2, pp. 107-108, 2009, DOI:10.3970/icces.2009.009.107

    Abstract The conjugate gradient method (CGM) is applied in an inverse fin design problem in estimating the optimum shapes for the non-Fourier spine and longitudinal fins based on the desired fin efficiency and fin volume at the specified time. One of the advantages in using CGM in the inverse design problem lies in that it can handle problems having a huge number of design parameters easily and converges very fast.
    The validity of using CGM in solving the present inverse design problem is justified by performing the numerical experiments. Several test cases involving different design fin efficiency, design fin volume, specified… More >

  • Open Access


    Computational Modeling of Human Bicuspid Pulmonary Valve Dynamic Deformation in Patients with Tetralogy of Fallot

    Caili Li1, §, Christopher Baird2, Jing Yao3, Chun Yang4, Liang Wang5, Han Yu5, Tal Geva6, Dalin Tang5*, 7, §

    CMES-Computer Modeling in Engineering & Sciences, Vol.119, No.1, pp. 227-244, 2019, DOI:10.32604/cmes.2019.06036

    Abstract Pulmonary valve stenosis (PVS) is one common right ventricular outflow tract obstruction problem in patients with tetralogy of Fallot (TOF). Congenital bicuspid pulmonary valve (BPV) is a condition of valvular stenosis, and the occurrence of congenital BPV is often associated with TOF. Dynamic computational models of normal pulmonary root (PR) with tri-leaflet and PR with BPV in patients with TOF were developed to investigate the effect of geometric structure of BPV on valve stress and strain distributions. The pulmonary root geometry included valvular leaflets, sinuses, interleaflet triangles and annulus. Mechanical properties of pulmonary valve leaflet were obtained from biaxial testing… More >

  • Open Access


    Formation of Highly Oriented Cellulose Nanocrystal Films by Spin Coating Film from Aqueous Suspensions

    Mingzhe Jiang1, S. Nicole DeMass1, D. Ross Economy2, Thomas Shackleton1, Christopher L. Kitchens1*

    Journal of Renewable Materials, Vol.4, No.5, pp. 377-387, 2016, DOI:10.7569/JRM.2016.634131

    Abstract Spin coating was used to cast a uniform film of cellulose nanocrystals with low surface roughness and variable thickness as a function of operational parameters that include rotational speed and dispense suspension concentration. The film thickness was controllable from 40 nm up to 1 μm with surface roughness an order of magnitude less than blade-coating methods. The degree of radial orientation was qualitatively assessed and shown to be variable with processing parameters. Under specific processing conditions, the formation of striation patterns was observed and associated with film drying instability. The striation patterns are periodic in nature where the wavelength and… More >

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