Enhancement Reinforcing Concrete Beams Using Polypropylene Cord-Knitted Bars

Currently, technical fabrics play a major role in many industries due to their multiple characteristics. The aim of this research was to utilize composite knitted bars to reinforce concrete beams. Six cord-knitted samples with two different polypropylene yarn counts (outer layer) and three different core materials were manufactured and immersed in a local epoxy material (Kemapoxy 150). Composite knitted bars were prepared in this way. Several tests were conducted for fabrics and knitted bar samples. All data were collected and analysed using two different tools: ANOVA test and radar chart area. Finally, three concrete beams with a varying number of cord-knitted bars (one bar, two bars and three bars) were produced. The results indicated that the differences in outer and core yarns for cord-knitted samples have a significant effect on several fabric and bar characteristics. The knitted bars with PP core yarn can be more beneficial for concrete that do does not require high stress, while the knitted bars using glass fibres and polypropylene (50% and 50% PE) as core materials are not appropriate for applications that require more flexibility and extensibility. Reinforced concrete beams were improved significantly with cord-knitted bars, taking into account the number of bars per area, which may cause the minimizing of flexure force through an increase in that number of bars per area

State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling

Climatic variabilities on millennial and longer time scales with a bipolar seesaw pattern have been documented in paleoclimatic records, but their frequencies, relationships with mean climatic state, and mechanisms remain unclear. Understanding the processes and sensitivities that underlie these changes will underpin better understanding of the climate system and projections of its future change. We investigate the long-term characteristics of climatic variability using a new ice-core record from Dome Fuji, East Antarctica, combined with an existing long record from the Dome C ice core. Antarctic warming events over the past 720,000 years are most frequent when the Antarctic temperature is slightly below average on orbital time scales, equivalent to an intermediate climate during glacial periods, whereas interglacial and fully glaciated climates are unfavourable for a millennial-scale bipolar seesaw. Numerical experiments using a fully coupled atmosphere-ocean general circulation model with freshwater hosing in the northern North Atlantic showed that climate becomes most unstable in intermediate glacial conditions associated with large changes in sea ice and the Atlantic Meridional Overturning Circulation. Model sensitivity experiments suggest that the prerequisite for the most frequent climate instability with bipolar seesaw pattern during the late Pleistocene era is associated with reduced atmospheric CO2 concentration via global cooling and sea ice formation in the North Atlantic, in addition to extended Northern Hemisphere ice sheets

η′\eta^{\prime} production in proton-proton scattering close to threshold}

The $pp \to pp \eta^{\prime}$ (958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energies \mbox{$Q = ~1.5 ~MeV, ~1.7 ~MeV, ~2.9 ~MeV,$ and $~4.1 MeV$} have been evaluated to be \mbox{$\sigma = 2.5 \pm 0.5~nb$, $~~~ 2.9 \pm 1.1~nb$, $~~~ 12.7 \pm 3.2~nb$, ~ and $~~~ 25.2 \pm 3.6 ~nb$}, respectively. In this region of excess energy the $\eta^{\prime}$ (958) cross sections are much lower compared to those of the $\pi ^0$ and $\eta$ production.Comment: 11 pages, 3 figure

Primary squamous cell carcinoma of the breast: A case report and review of literature

Primary squamous cell carcinoma is a well known malignancy of the skin and other organs composed of squamous cells, which are normally not found inside the breast. Therefore, a primary squamous cell carcinoma of the breast is an exceedingly uncommon phenomen and the management of this type of disease is still unclear. We report the case of a 43-year-old Moroccan woman, without significant medical history, presented an infected mass of 9 cm in the left breast associated with ipsilateral axillary lymphadenopathy.The mass's surgical biopsy revealed a triple negative primary squamous cell carcinoma of the breast. She underwent a neoadjuvant chemotherapy using 5 Fluoro-Uracil and platinum. After three courses, she presented a contralateral breast progression and apparition of metastasis at D10. She received one course of a palliative chemotherapy based on weekly paclitaxel stopped because of her peformans status deterioration. She died 7 months after her admission

Joint estimation-detection of cyber attacks in smart grids: Bayesian and non-Bayesian formulations

[abstract not available

Passivity Based current controller design for Permanent Magnet Synchronous Motor

International audienc