Experimental study of the polycarbonate behaviour during complex loadings and comparison with the Bo.docx

1、Experimental study of the polycarbonate behaviour during complex loadings and comparison with the BoExperimental study of the polycarbonate behaviour during complex loadings and comparison with the Boyce, Parks and Argon model predictionsOriginal Research ArticleMaterials & Design, Volume 30, Issue

2、8, September 2009, Pages 3126-3140Cynthia Dreistadt, Anne-Sophie Bonnet, Pierre Chevrier, Paul LipinskiClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractThe aim of this paper is to characterise the mechanica

3、l behaviour of polycarbonate in complex loadings through experimental investigations. Various strain paths and histories have been experimented in compression such as loadingunloading for different strains, repeated loadingunloading with various dwell times and stress levels and non-radial loading t

4、ests. All these experiments have been carried out at a constant nominal strain rate (0.001/s) and room temperature. Elastic, permanent and recoverable strain components have been identified and their strain rate evolution estimated. The influence of dwell time and stress level on the anelastic defor

5、mation has also been studied. The non-radial experiments have emphasised the strongly anisotropic behaviour of polycarbonate. Finally, the results of these tests are compared to the well known Boyce, Parks and Argon (BPA) Boyce MC, Parks DM, Argon AS. Large inelastic deformation of glassy polymers P

6、art I: rate dependent constitutive model. Mech Mater 1988;7:1533, 1 constitutive model. The major discrepancies observed concern the absence of simulated permanent strain and the incorrect description of the anelastic strain. Besides, the predicted anisotropic response of polycarbonate (PC) does not

7、 match the experimental observations. The role of internal stresses, induced by deformation process, on polycarbonate behaviour is pointed out.Article Outline1. Introduction2. Experimental procedure and identification of material constants for BPA model3. Experimental results. Comparison with the BP

8、A modified model 3.1. Loadingunloading tests. Identification of permanent strain3.2. Repeated loadingpartial unloading tests3.3. Study of strain induced anisotropy4. ConclusionsAppendix A. The Boyce, Parks and Argon modified modelReferencesPurchase$ 41.9577New catalytic materials for the high-temper

9、ature synthesis of hydrocyanic acid from methane and ammonia by high-throughput approachOriginal Research ArticleApplied Catalysis A: General, Volume 334, Issues 1-2, 1 January 2008, Pages 73-83S. Moehmel, N. Steinfeldt, S. Engelschalt, M. Holena, S. Kolf, M. Baerns, U. Dingerdissen, D. Wolf, R. Web

10、er, M. BewersdorfClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractFor converting methane and ammonia to hydrocyanic acid, catalysts were prepared and tested in a 48-parallel channel fixed-bed reactor unit o

11、perating at temperatures up to 1373K. The catalysts were synthesized with a robot applying a genetic algorithm as the design tool. New and improved catalyst compositions were discovered by using a total of seven generations each consisting of 92 potential catalysts. Thereby, the catalyst support tur

12、ned out as an important input variable. Furthermore, platinum, which is well known as a catalytic material was confirmed. Moreover, improvements in HCN yield were achieved by addition of promoters like Ir, Au, Ni, Mo, Zn and Re. Multi-way analysis of variance and regression trees were applied to est

13、ablish correlations between HCN yield and catalyst composition (support and metal additives). The obtained results are considered as the base for future even more efficient screening experiments.Article Outline1. Introduction2. Experimental 2.1. Design of the test unit2.2. Analytics2.3. Catalyst pre

14、paration2.4. Reaction conditions3. Methodology 3.1. Genetic algorithm (GA)3.2. Data analysis4. Results and discussion 4.1. Validation of the high-throughput approach 4.1.1. Validation of the high-throughput testing unit4.1.2. Validation of the high-throughput preparation4.2. Catalytic results on bar

15、e and Pt-loaded supports4.3. Results of catalyst development by the use of an evolutionary procedure (GA)4.4. Data analysis5. ConclusionsAcknowledgementsReferencesPurchase$ 41.95Graphical abstractFor converting methane and ammonia to hydrocyanic acid, improved catalyst formulations were obtained usi

16、ng high-throughput experimentation (preparation and testing) and a genetic algorithm as design tool. Furthermore, multi-way analysis of variance and regression trees were applied to establish correlations between HCN yield and catalyst composition. 78A Chryseobacterium meningosepticum outbreak obser

17、ved in 3 clusters involving both neonatal and non-neonatal pediatric patientsAmerican Journal of Infection Control, Volume 36, Issue 6, August 2008, Pages 453-457Mehmet Ceyhan, Inci Yldrm, Alper Tekel, Murat Yurdakok, Ebru Us, Belgin Altun, Tezer Kutluk, Ali Blent Cengiz, Venhar Gurbuz, Cagri Barn,

18、Arzu Bagdat, Duygu Cetnkaya, Deniz Gur, Onur TuncelClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences Three clusters of Chryseobacterium meningosepticum infections in a tertiary health center in July 2006 and January

19、 2007 involving 8 newborns and 5 older children were investigated. The index patient was from the neonatal intensive care unit, and the older patients were from other pediatric wards. Cultures were obtained from the environment and from health care workers hands as part of an outbreak investigation.

20、 C meningosepticum was isolated from hand cultures obtained from a senior resident and from environmental cultures obtained from powdered infant formula, an electrical button, a computer keyboard, phone, a doorknob, and an Ambu bag. Antibiogram typing and enterobacterial repetitive intergenic consen

21、sus sequence polymerase chain reaction indicated that all of the isolates were epidemiologically related. Nine patients improved on antimicrobial treatment, and 4 premature infants died after the infection. C meningosepticum is a well-known etiologic agent for nosocomial infections involving newborn

22、s and immunocompromised patients. Wet and dry environmental surfaces and equipment may act as a source or play a role in disseminating the microorganism. Outbreaks may be controlled with strong emphasis on infection control measures.Article OutlineMethods Hospital and medical care settingsPatientsOu

23、tbreak investigationInfection control interventionsBacterial isolates and molecular testingResultsDiscussionReferencesPurchase$ 31.5079A medical device for prefabrication of large bone grafts in modern medicineOriginal Research ArticleMedical Hypotheses, Volume 76, Issue 4, April 2011, Pages 489-491

24、Claude Laflamme, Mahmoud RouabhiaClose preview| Supplementary content| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractTranslating advances in the laboratory into sound clinical practice presents a series of formidable c

25、onceptual and technical challenges. One of them is our inability to maintain large grafts of living cells upon transfer from in vitro conditions into the host in vivo. This is due mainly to diffusion limitations within the grafting material. We embrace the well-known hypothesis of the “Diamond Conce

26、pt” in bone tissue regeneration, which includes four key factors. Based on the understanding of basic elements of tissue engineering constructs, prefabrication and conditioning techniques and the nano-vascularisation of the scaffold, we furthermore hypothesize that combinations of cells, solid multi

27、polymeric scaffold as the “core element” working as the extracellular matrix (ECM), growth factors and nano-vascularisation setting may eventually generate a large “ready-to-use” in vitro/in vivo graft. We are confident and think that growth factors will help in the construction of a step-by-step or

28、ganisation of the bone tissue engineering construct (BTEC). A medical device, named in vitro/in vivo Bone Bioreactor Tissue Engineering Construct (IV2B2TEC), is proposed to fulfil the hypothesis. Soon, we hope to test the above hypothesis on a non-union bone defect in an animal model. This novel str

29、ategy will likely open new options for reconstructing extended bone defects and facilitate clinical translation of bone tissue engineering. As compared with conventional reconstructive methods, the strategy has four key advantages and might prove to be a novel armamentarium for clinicians in regener

30、ative medicine.Article OutlineIntroduction IV2B2TEC: an integrated strategy for prefabrication of large bone graftsBuilding a scaffold: the fishing unwinding approach lets put the cells into it!Stem cells and growth factorsAutomated “biocreators”: keynotes on kinetics/timing/controlling of the biolo

31、gical parameters with micropumpsAngiogenesis and nano-vascularisationPresentation of the hypothesisConflict of interest statementAcknowledgementsAppendix A. Supplementary dataReferencesPurchase$ 31.5080Fuzzy Regression Model to Predict the Bead Geometry in the Robotic Welding ProcessOriginal Research ArticleActa Metallurgica Sinica (English Letters), Volume 20, Issue 6, December 2007, Pages 391-397B.S. Sung, I.S. Kim, Y. Xue, H.H. Kim, Y.H. ChaClose preview| Related articles|Related reference work articles AbstractAbstract Recently, there has been a rapid development in computer techno