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Open access

Sabina Galiniak, Izabela Krawczyk-Merć and Agnieszka Pedrycz

B ibliography 1. Angelos MG, Kaufman DS. Pluripotent stem cell applications for regenerative medicine. Curr Opin Organ Transplant 2015; 20(6):663-70, DOI 10.1097/MOT.0000000000000244. 2. Paździorek PR. Mathematical model of stem cell differentiation and tissue regeneration with stochastic noise. Bull Math Biol 2014; 76(7):1642-69, DOI 10.1007/s11538-014-9971-5. 3. Jaenisch R, Young R. Stem cells, the molecular circuitry of pluripotency and nuclear reprogramming. Cell 2008; 13: 567-582, DOI 10.1016/j.cell.2008.01.015. 4. Evans MJ, Kaufman

Open access

Żaneta Anna Mierzejewska and Zbigniew Oksiuta

. (1980), Current Concept Review Causes of Fractures of the Femoral Component in Total Hip Replacement, Journal of Bone and Joint Surgery, Vol. 62 (4), Vol. 62(4), 670-673. 5. Griza S., Vieira dos Santos S., Ueki M. M., Bertoni F., Strohaecker T.R. (2013), Case study and analysis of a fatigue failure in a THA stem, Engineering Failure Analysis, 28, 166-175. 6. HernandezRodriguez M. A. L., OrtegaSaenz J. A., CotrerasHernandez G. R. (2010), Failure analysis of a total hip prosthesis implanted in active patient, Journal of the Mechanical

Open access

Sutiyoko, Suyitno, Muslim Mahardika and A. Syamsudin

Abstract

Design of gating system is an important factor in obtaining defect-free casting. One of the casting defects is a porosity caused by internal shrinkage in solidification process. Prediction of the internal shrinkage porosity in the femoral stem of commercially pure titanium (CP-Ti) is investigated based on the gating system design. The objective of this research is to get the best gating system between three gating system designs. Three gating system designs of the femoral stem were simulated in an investment casting method. The internal shrinkage porosity occurs on the largest part and near the ingate of the femoral stem. The gating system design that has ingates cross section area: 78.5; 157; and 128.5 mm2 has the least of the internal shrinkage porosity. This design has the most uniform solidification in the entire of the femoral stem. An experiment is conducted to validate the simulation data. The results of internal shrinkage porosity in the three gating system designs in the simulation were compared with the experiment. Based on the comparison, the trend of internal shrinkage porosity at the three gating system designs in the simulation agrees with the experiment. The results of this study will aid in the elimination of casting defect.

Open access

Gabriela Belova and Anna Hristova

://pangeaupr.org/2015/04/17/case-note-brustle-v-greenpeace/ [14-15] http://eulawanalysis.blogspot.bg/2014/12/the-cjeu-clarifies-when-stem-cells-can.html [16] http://analysis1921.rssing.com/chan-30137355/all_p5.html [17-18] http://eulawanalysis.blogspot.bg/2014/12/the-cjeu-clarifies-when-stem-cells-can.html [19] http://humanistfederation.eu/ckfinder/userfiles/files/our-work/SRHR/IB%208%20European%20Citizens'%20Inititative%20-%20One%20of%20Us.pdf [20] http://www.oneofus.eu/initiative-explanation/ [21] http

Open access

O. W. Oseni and M. T. Audu

Abstract

The compressive strength properties of concrete are substantial factors in the design and construction of concrete structures. Compressive strength directly affects the degree to which the concrete can be able to carry a load over time. These changes are complemented by deflections, cracks etc., in the structural elements of concrete. This research investigated the effect of groundnut leaf/stem ash (GLSA) on the compressive strength of concrete at 0%, 5 %, 10 % and 15 % replacements of cement. The effect of the water-cement ratio on properties such as the compressive strength, slump, flow and workability properties of groundnut leaf/stem ash (GLSA) mixes with OPC were evaluated to determine whether they are acceptable for use in concrete structural elements. A normal concrete mix with cement at 100 % (i.e., GLSA at 0%) with concrete grade C25 that can attain an average strength of 25 N/mm2 at 28 days was used as a control at design water-cement ratios of 0.65 and grading of (0.5-32) mm from fine to coarse aggregates was tested for: (1) compressive strength, and the (2) slump and flow Test. The results and observations showed that the concrete mixes from GLSA at 5 – 15 % ratios exhibit: pozzolanic properties and GLSA could be used as a partial replacement for cement at these percentage mix ratios compared with the control concrete; an increase in the water-cement ratio showed a significant decrease in the compressive strength and an increase in workability. Therefore, it is important that all concrete mixes exude an acceptably designed water-cement ratio for compressive strength characteristics for use in structures, water-cement ratio is a significant factor.

Open access

Nadezhda Nadezhdina, Jan Čermák, Alec Downey, Valeriy Nadezhdin, Martti Perämäki, Jorge Soares David, Clara A. Pinto and Teresa Soares David

-460. Čermák, J., Kučera, J., Bauerle, W.L., Phillips, N., Hinckley, T., 2007. Tree water storage and its diurnal dynamics related to sap flow and changes in stem volume in old-growth Douglas- fir trees. Tree Physiol., 27, 181-198. David, T.S., David, J.S., Pinto, C.A., Čermák, J., Nadezhdin, V., Nadezhdina, N., 2012. Hydraulic connectivity from roots to branches depicted through sap flow: analysis on a Quercus suber tree. Funct. Plant Biol., 39, 103-115. Deslauriers, A., Morin, H., Urbinati, C., Carrer, M., 2003. Daily weather response of

Open access

Hag Soo Jang, Hwa Joon Lee, Young Ryeol Joo, Jung Joong Kim and Ho Hwan Chun

Abstract

The hydrodynamic effect of appendages for high-speed passenger vessels, such as Ro-Pax, Ro-Ro and cruiser vessels, is very severe and, therefore, it is essential to carry out the design of appendages for high-speed passenger vessels from the preliminary design stage to the final detail design stage through a full survey of the reference vessels together with sufficient technical investigation. Otherwise, many problems would be caused by mismatches between the appendages and the hull form. This paper investigates the design characteristics of some appendages, such as the side thruster, the shaft-strut, and the stern wedge, based on the design experience accumulated at Samsung, on CFD, and on model test results for high-speed passenger vessels. Further to this investigation, some practical and valuable design guidelines for such appendages are suggested.

Open access

Nadezhda Nadezhdina, Josef Urban, Jan Čermák, Valeriy Nadezhdin and Petr Kantor

sap flow in woody stems of dominant and understory species: scaling errors associated with positioning of sensors. Tree Physiology, 22, 907-918. Nadezhdina, N., Čermák, J., Gasparek, J., Nadezhdin, V., Prax, A., 2006.Vertical and horizontal water redistribution wit,hin Norway spruce (Picea abies) roots in the Moravian Upland. Tree Physiology, 26, 1277-1288. Nadezhdina, N., David, T.S., David, J.S., Ferreira, I., Dohnal, M., Tesar, M., Gartner, K., Leitgeb, E., Nadezhdin, V., Čermák, J., Jimenez, M.S., Morales, D., 2010. Trees never

Open access

Shengqi Jian, Zening Wu, Caihong Hu and Xueli Zhang

–31. IUSS Working Group WRB, 2006. World reference base for soil resources 2006. 2 nd edition. World Soil Resources Reports No. 203. FAO, Rome. Ivans, S., Hipps, L., Leffler, A.J., Ivans, C.Y., 2006. Response of water vapor and CO 2 fluxes in semiarid lands to seasonal and intermittent precipitation pulses. J. Hydrometeorol., 7, 995–1010. Ježík, M., Blaženec, M., Letts, M.G., Ditmarová, L’., Sitková, Z., Střelcová, Z., 2015. Assessing seasonal drought stress response in Norway spruce ( Picea abies (L.) Karst.) by monitoring stem circumference and sap flow

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Nenad Mladineo, Marko Mladineo and Snjezana Knezic