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1.
Xiao-Juan Luo Triantafyllos Stylianopoulos Victor H. Barocas Mark S. Shephard 《Engineering with Computers》2009,25(1):87-95
The mechanical function of soft collagenous tissues is inherently multiscale, with the tissue dimension being in the centimeter
length scale and the underlying collagen network being in the micrometer length scale. This paper uses a volume averaging
multiscale model to predict the collagen gel mechanics. The model is simulated using a multiscale component toolkit that is
capable of dealing with any 3D geometries. Each scale in the multiscale model is treated as an independent component that
exchanges the deformation and average stress information through a scale-linking operator. An arterial bifurcation was simulated
using the multiscale model, and the results demonstrated that the mechanical response of the soft tissues is strongly sensitive
to the network orientation and fiber-to-fiber interactions. 相似文献
2.
Vassiliadis S. Triantafyllos G. Kobrosly W. 《Knowledge and Data Engineering, IEEE Transactions on》1997,9(4):646-652
We address issues related to the definition of faults, errors and failures and their separability, and attribution to the different development processes of computing systems. In particular, we deal with historical databases, which presumably contain certain data (i.e., test failure data) and describe the methodology that can be used to analyze the database and obtain the pertinent information. The validation method may be of particular importance, especially when information from the database needs to be extrapolated for a purpose other than the one for which the database was developed. Our methodology was used to evaluate the historical data collected during the development of the IBM 4381 and 9370 family of computers, and to extrapolate the faults found during the function testing 相似文献
3.
Effect of hydraulic retention time,temperature, and organic load on a horizontal subsurface flow constructed wetland treating cheese whey wastewater
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4.
The present article pertains to the definition and properties of the optimum torsion axis of flexural‐shear multistorey systems, employing the continuous model of the structure. It is known that, in the general case of a multistorey building, it is not possible to define the real vertical elastic axis (as well as the centre of stiffness) of the building. However, in this case it is possible to define the fictitious vertical elastic axis of the building, which plays the same part as the real elastic axis. In the present article, we use the theory of the continuous model of the structure for the definition of the fictitious vertical elastic axis from a closed mathematical equation. The continuous model of the structure surpasses the discrete respective model in the qualitative comprehension of the response of multistorey tall systems. On the contrary, the discrete model surpasses the continuous model in the accuracy of calculations, but in the present article this is of lesser importance than the qualitative comprehension. Consequently, it is proved that the fictitious vertical elastic axis also constitutes the optimum torsion axis of the building, and at the same time the characteristic properties of the axis in question are set off. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
5.
Vassiliadis S. Triantafyllos G. Kobrosly W. 《Knowledge and Data Engineering, IEEE Transactions on》1994,6(6):868-882
Describes a question-answering system based on fuzzy logic. The proposed system provides the capability to assess whether a database contains information pertinent to a subject of interest by evaluating each comment in the database via a fuzzy evaluator that attributes a fuzzy membership value indicating its relationship to the subject. An assessment is provided for the database as a whole regarding its pertinence to the subject of interest, and consequently comments that are considered irrelevant to the subject may be discarded. The system has been developed for the examination of databases that were created during the development of the IBM 4381 computer systems, for bookkeeping purposes, to assess whether such databases contain information pertinent to the functional changes that occurred during the development cycle. The system, however, can be applied with minimal changes to a variety of circumstances, provided that the fundamental assumptions for the development of the membership functions are respected in the new application. Its applicability, without modifications, assuming the same subject of interest, is granted for databases comprising similar characteristics to that of the original database for which the system has been developed 相似文献
6.
Triantafyllos Roukas 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,59(4):387-393
The continuous production of ethanol from carob pod extract by immobilized Saccharomyces cerevisiae in a packed-bed reactor has been investigated. At a substrate concentration of 150 g dm?3, maximum ethanol productivity of 16 g dm?3 h?1 was obtained at D = 0·4 h?1 with 62·3% of theoretical yield and 83·6% sugars′ utilization. At a dilution rate of 0·1 h?1, optimal ethanol productivity was achieved in the pH range 3·5–5·5, temperature range 30–35·C and initial sugar concentration of 200 g dm?3. Maximum ethanol productivity of 24·5 g dm?3 h?1 was obtained at D = 0·5 h?1 with 58·8% of theoretical yield and 85% sugars′ utilization when non-sterilized carob pod extract containing 200 g dm?3 total sugars was used as feed material. The bioreactor system was operated at a constant dilution rate of 0·5 h?1 for 30 days without loss of the original immobilized yeast activity. In this case, the average ethanol productivity, ethanol yield (% of theoretical) and sugars′ utilization were 25 g dm?3 h?1, 58·8% and 85·5%, respectively. 相似文献
7.
In the present article, a new method is presented which attempts to identify the dynamic characteristics (eigen frequencies, eigen periods, mode shapes and modal damping ratios) of spatial asymmetric tall multi‐storey buildings through measured seismic responses (accelerations). This new method is entitled ‘method of modal time‐histories’, because its main target is to identify the modal time‐histories of accelerations that are obtained by accelerograms recorded on the points of buildings where suitable accelerometers have been installed. In the case of an earthquake, the multi‐channel local network of accelerometers records the time‐histories of the accelerations of the building. In addition, in order to have a successful outcome, the instrumentation form of the multi‐channel local network on the building can potentially play the most important role. This paper, first, presents a relevant mathematical analysis that is adapted to the instrumentation form applied to the multi‐storey buildings and, second, outlines the new method, which consists of nine steps. Finally, in order to illustrate the theory, a suitable numerical example of an instrumented asymmetric five‐storey r/c building that has been oscillated by a weak earthquake is also provided. On the one hand, the identification of the dynamic characteristics of spatial asymmetric buildings contributes to the removal of the uncertainties of building models in order to perform advanced non‐linear analyses about inherent building seismic capacity. On the other hand, this method supports the simple monitoring of a building's ‘structural integrity’. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
8.
Tuning the Mechanical Properties of BIEE‐Crosslinked Semi‐Interpenetrating,Double‐Hydrophilic Hydrogels
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Georgia Papaparaskeva Chrysovalantis Voutouri Vasiliki Gkretsi Mariliz Achilleos Ivo Safarik Kristyna Pospiskova Triantafyllos Stylianopoulos Theodora Krasia‐Christoforou 《大分子材料与工程》2018,303(6)
Double‐hydrophilic, semi‐interpenetrating (semi‐IPN) hydrogels are synthesized by encapsulating hydrophilic polyvinylpyrrolidone (PVP) linear chains in structure‐defined 1,2‐bis‐(2‐iodoethoxy)ethane (BIEE)‐crosslinked (poly(2‐(dimethylamino)ethyl methacrylate) (pDMAEMA) hydrogels. A series of semi‐IPN double‐hydrophilic hydrogels are prepared in which the pDMAEMA/BIEE content is kept the same and only the PVP content is varied, from 0 up to 33 wt%. The mechanical properties of the water‐swollen hydrogels are experimentally evaluated under unconfined compressive loading conditions, while a nonlinear hyperelastic constitutive equation is used to predict their mechanical response. No significant difference is found in the mechanical response of the semi‐IPN PVP/pDMAEMA/BIEE hydrogel containing 5 wt% PVP compared to the pDMAEMA/BIEE analog, however, for greater loading percentages (15 and 33 wt% of PVP), the semi‐IPN hydrogels exhibit less stiffness/higher ductility. Furthermore, in vitro biocompatibility studies are carried out for the pDMAEMA/BIEE and the semi‐IPN PVP/pDMAEMA/BIEE, indicating that both the formulations exhibit no toxicity in cultured cells. 相似文献
9.
Aerobic biological treatment of second cheese whey in suspended and attached growth reactors
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10.
Photocatalytic degradation of the herbicide clopyralid: kinetics,degradation pathways and ecotoxicity evaluation
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