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15. Small punch testing of Al-TiB2 composites fabricated by spark plasma sintering: A computational and experimental study.

Author

Priel, E, Mittelman, B, Trabelsi, N, Lulu-Bitton, N, Haroush, S, Kalabukhov, S, Hayun, S, and Navi, NU

Subjects
METALLIC composites, MECHANICAL behavior of materials, YIELD stress, MATERIALS testing, FLEXURAL modulus, CONTINUUM damage mechanics, RECEIVER operating characteristic curves, CURVES
Abstract

The Small Punch Test (SPT) method is especially useful for quantifying the mechanical properties of metallic materials in cases where the material available for testing is limited or for in service monitoring. However, the applicability of this method to metal matrix composites has not yet been fully established. In the present study, Al-TiB2 composite billets with TiB2 particle volume fractions of 5%,10% and 15% were manufactured using Spark Plasma Sintering (SPS). Thin specimens with 0.5 mm thickness were cut from the billets, and SPT experiments were conducted until failure. Well-accepted analytical techniques were utilized to determine the Al-TiB2 composite effective yield stress for all TiB2 particle volume fractions. It was shown, that standard analytical methods for characterizing the effective yield stress were adequate only for TiB2 volume fractions of up to 5%. The experimental mechanical response up to and including failure was reproduced for all Al-TiB2 compositions by finite element analysis incorporating a continuum damage mechanics approach. The computational analysis revealed that for high TiB2 volume content, the region of the SPT loading curve which is commonly associated with specimen yielding, may represent a mixture of yielded and damaged areas. Since the damage distribution in the specimen influences the specimen flexural modulus, standard analytical relations cannot be used to determine the composite yield stress and computational methods must be used. This finding may explain the inconsistent results reported in the literature with regard to the accuracy of the SPT method in determining the effective yield stress for metal matrix composites. [ABSTRACT FROM AUTHOR]

Published
2022
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22. Randomized Trial of Oral Teriflunomide for Relapsing Multiple Sclerosis

Author

Paul, O'Connor, Wolinsky, Jerry S., Christian, Confavreux, Giancarlo, Comi, Ludwig, Kappos, Olsson, Tomas P., Hadj, Benzerdjeb, Philippe, Truffinet, Lin, Wang, Aaron, Miller, Temso Trial Group Reingold, Freedman Ms S., Cutter, G., Antel, J., Barkhof, F., Maddrey, W., Ravnborg, M., Schenker, S., O'Connor, P., Wolinsky, J. S., Confavreux, C., Comi, G., Kappos, L., Olsson, T. P., Miller, A., Freedman, Mark S., Narayana, P. A., Nelson, F., Vainrub, I., Datta, S., He, R., Gates, B., Ton, K., Wamil, B., Truffinet, P., Igau, B., Nicolas, V., Notelet, L., Payrard, S., Wijnand, P., Devore, S., H. H., Li, Osho, T., Wang, L., Wei, L., Dukovic, D., Ling, Y., Benzerdjeb, H., Mednikova, Z., Trabelsi, N., Musset, M., Merrill, D., Turpault, S., Williams, B., Nortmeyer, H., Kirst, E., Witthaus, E., Chen, S., Maida, E., Auff, E., Fazekas, F., Berger, T., Bhan, V., Bouchard, J. P., Duquette, P., Freedman, M., Grand'Maison, F., Kremenchutzky, M., Bourque, C., Marrie, R. A., Melanson, M., Patry, D., Oger, J., Stefanelli, M., Jacques, F., Venegas, P., Miranda, M., Barrientos, N., Tenhamm, E., Gloger, S., Rohde, G., Mares, J., Frederiksen, J., Stenager, E., Haldre, S., Gross Paju, K., Elovaara, I., Sumelahti, M. L., Erälinna, J. P., Farkkila, M., Harno, H., Reunanen, M., Jolma, T., Camu, W., Clavelou, P., Magy, L., Debouverie, M., Edan, G., Lebrun Frenay, C., Moreau, T., Pelletier, J., Roullet, E., Alamowitch, S., Clanet, M., Hautecoeur, P., Damier, P., Rumbach, L., Chan, A., Schimrigk, S., Haas, J., Lensch, E., Diener, H., Limmroth, V., Anders, D., Berghoff, M., Oschmann, P., Stangel, M., Frese, A., Kiefer, R., Marziniak, M., Zettl, U., Stark, E., Jendroska, K., Reifschneider, G., Amato, M. P., Cosi, V., Gallo, P., Gasperini, Claudio, Ghezzi, A., Trojano, M., Pozzilli, Carlo, Montanari, E., Zwanikken, C. P., Jongen, P. J., Van Munster, E. T., Hupperts, R. M., Anten, B., Sanders, E. A., Celius, E., Hovdal, H., Krogseth, S. B., Kozubski, W., Kwiecinski, H., Czlonkowska, A., Stelmasiak, Z., Selmaj, K., Hasiec, T., Fryze, W., Drozdowski, W., Kochanowicz, J., Cunha, L., De Sa, J., Sena, A. H., Odinak, M., Skoromets, A., Gusev, E., Boiko, A., Lashch, N., Stolyarov, I., Belova, A., Malkova, N., Doronin, B., Yakupov, E., Brundin, L., Hillert, J., Karabudak, R., Irkec, C., Idiman, E., Turan, O., Efendi, H., Gedizlioglu, M., Buchakchyyska, N., Goloborodko, A., Ipatov, A., Kobets, S., Lebedynets, V., Moskovko, S., Sanotskyy, Y., Smolanka, V., Yavorskaya, V., Bates, D., Evangelou, N., Hawkins, C., Mclean, B., O'Riordan, J., Price, S., Turner, B., Barnes, D., Zajicek, J., Honeycutt, W., Khan, O., Spikol, L., Stevens, J., Klinische Neurowetenschappen, and RS: MHeNs School for Mental Health and Neuroscience

Subjects
medicine.medical_specialty, biology, Nausea, business.industry, Incidence (epidemiology), Placebo-controlled study, General Medicine, Placebo, Gastroenterology, Surgery, chemistry.chemical_compound, Alanine transaminase, chemistry, Internal medicine, Relative risk, Teriflunomide, medicine, biology.protein, medicine.symptom, business, Leflunomide, medicine.drug
Abstract

Teriflunomide reduced the annualized relapse rate (0.54 for placebo vs. 0.37 for teri flunomide at either 7 or 14 mg), with relative risk reductions of 31.2% and 31.5%, respectively (P

Published
2011

24. When and where do patients with bone metastases actually break their femurs?

Author

Sternheim, A., Traub, F., Trabelsi, N., Dadia, S., Gortzak, Y., Snir, N., Gorfine, M., and Yosibash, Z.

Abstract

AimsAccurate estimations of the risk of fracture due to metastatic bone disease in the femur is essential in order to avoid both under-treatment and over-treatment of patients with an impending pathological fracture. The purpose of the current retrospective in vivo study was to use CT-based finite element analyses (CTFEA) to identify a clear quantitative differentiating factor between patients who are at imminent risk of fracturing their femur and those who are not, and to identify the exact location of maximal weakness where the fracture is most likely to occur.MethodsData were collected on 82 patients with femoral metastatic bone disease, 41 of whom did not undergo prophylactic fixation. A total of 15 had a pathological fracture within six months following the CT scan, and 26 were fracture-free during the five months following the scan. The Mirels score and strain fold ratio (SFR) based on CTFEA was computed for all patients. A SFR value of 1.48 was used as the threshold for a pathological fracture. The sensitivity, specificity, positive, and negative predicted values for Mirels score and SFR predictions were computed for nine patients who fractured and 24 who did not, as well as a comparison of areas under the receiver operating characteristic curves (AUC of the ROC curves).ResultsThe sensitivity of SFR was 100% compared with 88% for the Mirels score, and the specificity of SFR was 67% compared with 38% for the Mirels score. The AUC was 0.905 for SFR compared with 0.578 for the Mirels score (p = 0.008).ConclusionAll the patients who sustained a pathological fracture of the femur had an SFR of > 1.48. CTFEA was far better at predicting the risk of fracture and its location accurately compared with the Mirels score. CTFEA is quick and automated and can be incorporated into the protocol of CT scanners.Cite this article: Bone Joint J2020;102-B(5):638–645.

Published
2020
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25. Randomized Trial of Oral Teriflunomide for Relapsing Multiple Sclerosis

Author

O'Connor, P, Wolinsky, Js, Confavreux, C, Comi, G, Kappos, L, Olsson, Tp, Benzerdjeb, H, Truffinet, P, Wang, L, Miller, A, Freedman, Ms, Reingold, S, Cutter, G, Antel, J, Barkhof, F, Maddrey, W, Ravnborg, M, Schenker, S, Narayana, Pa, Nelson, F, Vainrub, I, Datta, S, He, R, Gates, B, Ton, K, Wamil, B, Igau, B, Nicolas, V, Notelet, L, Payrard, S, Wijnand, P, Devore, S, Li, Hh, Osho, T, Wei, L, Dukovic, D, Ling, Y, Mednikova, Z, Trabelsi, N, Musset, M, Merrill, D, Turpault, S, Williams, B, Nortmeyer, H, Kirst, E, Witthaus, E, Chen, S, Maida, E, Auff, E, Fazekas, F, Berger, T, Bhan, V, Bouchard, Jp, Duquette, P, Grand'Maison, F, Kremenchutzky, M, Bourque, C, Marrie, Ra, Melanson, M, Patry, D, Oger, J, Stefanelli, M, Jacques, F, Venegas, P, Miranda, M, Barrientos, N, Tenhamm, E, Gloger, S, Rohde, G, Mares, J, Frederiksen, J, Stenager, E, Haldre, S, Gross Paju, K, Elovaara, I, Sumelahti, Ml, Erälinna, Jp, Färkkilä, M, Harno, H, Reunanen, M, Jolma, T, Camu, W, Clavelou, P, Magy, L, Debouverie, M, Edan, G, Lebrun Frenay, C, Moreau, T, Pelletier, J, Roullet, E, Alamowitch, S, Clanet, M, Hautecoeur, P, Damier, P, Rumbach, L, Chan, A, Schimrigk, S, Haas, J, Lensch, E, Diener, H, Limmroth, V, Anders, D, Berghoff, M, Oschmann, P, Stangel, M, Frese, A, Kiefer, R, Marziniak, M, Zettl, U, Stark, E, Jendroska, K, Reifschneider, G, Amato, Mp, Cosi, V, Gallo, Paolo, Gasperini, C, Ghezzi, A, Trojano, M, Pozzilli, C, Montanari, E, Zwanikken, Cp, Jongen, Pj, Van Munster ET, Hupperts, Rm, Anten, B, Sanders, Ea, Celius, E, Hovdal, H, Krogseth, Sb, Kozubski, W, Kwiecinski, H, Czlonkowska, A, Stelmasiak, Z, Selmaj, K, Hasiec, T, Fryze, W, Drozdowski, W, Kochanowicz, J, Cunha, L, De Sá, J, Sena, Ah, Odinak, M, Skoromets, A, Gusev, E, Boiko, A, Lashch, N, Stolyarov, I, Belova, A, Malkova, N, Doronin, B, Yakupov, E, Brundin, L, Hillert, J, Karabudak, R, Irkec, C, Idiman, E, Turan, O, Efendi, H, Gedizlioglu, M, Buchakchyyska, N, Goloborodko, A, Ipatov, A, Kobets, S, Lebedynets, V, Moskovko, S, Sanotskyy, Y, Smolanka, V, Yavorskaya, V, Bates, D, Evangelou, N, Hawkins, C, Mclean, B, O'Riordan, J, Price, S, Turner, B, Barnes, D, Zajicek, J, Honeycutt, W, Khan, O, Spikol, L, and Stevens, J.

Published
2011

30. Phenolic composition of some Tunisian medicinal plants associated with anti-proliferative effect on human breast cancer MCF-7 cells

Author

Najjaa Hanen, Abdelkarim Ben Arfa, Doria Enrico, Boubakri Abdelbasset, Trabelsi Najla, Falleh Hanen, Tlili Hajer, and Neffati Mohamed

Subjects
antioxidant capacity, antiproliferative potential, breast cancer, phenolic compounds, traditional medicinal plants, Biotechnology, TP248.13-248.65
Abstract

Plants have been seen to possess the potential to be excellent biological matrices to serve as a basis for investigating the presence of promising therapeutic agents for cancer treatment. Several successful anti-cancer medicines - or their analogues - nowadays in use are plant derived and many more are under clinical trials. Under current circumstances, the purpose of this work was to test aqueous and ethanolic extracts of five aromatic and medicinal plants from arid zones on some tumor cell lines. These plants, Cymbopogon schoenanthus (L.) Spreng, Crithmum maritimum (L.) Spreng, Hammada scoparia (Pomel) Iljin, Retama raetam (Forssk.) and Zizyphus lotus (L.) Desf., widely used in Tunisian ethnomedicine, were assessed for their phenolic compounds, antioxidants and anticancer activities in aqueous and ethanol extracts. Total polyphenols, flavonoid and tannin contents were determined colorimetrically and some of these molecules were identified using RP-HPLC. A significant difference on phenolic contents and composition were found among the investigated plants. Cymbopogon schoenanthus was the richest in phenolic compounds (approx. 72%) with quercetine-3-o-rhamnoside (approx. 33%) as main contributor. For all the tested plants, the highest antioxidant capacity was detected in the ethanolic extracts rather than in the aqueous ones. The highest antiproliferative potential was observed for the ethanolic extracts. Hammada scoparia, Retama raetam and Zizyphus lotus exhibited important antiproliferative effect that reached 67% at a 1% extract concentration. Taken together, the present study supports the potential development of chemotherapeutic agents from, at least, four of the five studied Tunisian ethnomedicinal plants.

Published
2020
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48. Profil nutritionnel des enfants obèses

Author

Khadraoui, E., primary, Tertek, H., additional, Trabelsi, N., additional, Tmessek, A., additional, Sahli, N., additional, Trimech, A., additional, Dakhli, S., additional, and Ben Mami, F., additional

Published
2012
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