38 research outputs found
Modeling of yield surface evolution in uniaxial and biaxial loading conditions using a prestrained large scale specimen
No full textLarge-scale advanced high strength steel (AHSS) sheet specimens were deformed in uniaxial tension, using a novel grip system mounted on a MTS universal tension machine. After pre-strain, they were used as a pre-strained material to examine the anisotropic response in the biaxial tension tests with various load ratios, and orthogonal tension tests at 45° and 90° from the pre-strain axis. The flow curve and the instantaneous r-value of the pre-strained steel in each of the aforementioned uniaxial testing conditions were also measured and compared with those of the undeformed steel. Furthermore, an exhaustive analysis of the yield surface was also conducted and the results, prior and post-prestrain were represented and compared. The homogeneous anisotropic hardening (HAH) model [1] was employed to predict the behavior of the pre-strained material. It was found that the HAH-predicted flow curves after non-linear strain path change and the yield loci after uniaxial pre-strain were in good agreement with the experiments, while the r-value evolution after strain path change was qualitatively well predicted
Socio-cultural acceptability of urine diverted composting toilets: A review of literature for possible adoption in peri-urban areas as a sustainable sanitation solution
No full textGhosh, the shadow lines, and the Indian-English novel
No full textThe prizewinning author of novels, nonfiction, and hybrid texts, Amitav Ghosh grew up in India and trained as an anthropologist. His works have been translated in over thirty languages. They cross and mix a number of genres, from science fiction to the historical novel, incorporating ethnohistory and travelogue and even recuperating dead languages. His subjects include climate change, postcolonial identities, translocation, migration, oceanic spaces, and the human interface with the environment
Design and Synthesis of Low Molecular Weight and Polymeric Surfactants for Enhanced Oil Recovery
Get PDFSurfactants are defined as molecules able to lower the surface (or interfacial)tension at the gas/liquid, liquid/liquid, and liquid/solid interfaces. Due totheir properties, they are typically employed as detergents, emulsifiers, dispersants,wetting and foaming agents. In chemical enhanced oil recovery (cEOR), surfactantsare used as flooding agents, alone or in combination with polymers, alkali, and morerecently nanoparticles, to increase the microscopic displacement efficiency. Froma chemical point of view, surfactants are amphiphiles, meaning that they bear intheir structure both hydrophilic and hydrophobic moieties. Some naturally occurringsurfactants exists, but the majority are synthetic. The availability of syntheticsurfactants, allows a big variety of structures and properties. In this chapter, the mainclasses of surfactants will be reviewed, with focus on those used or proposed foruse for chemical enhanced oil recovery. After a general introduction about surfactantsand their main structural and physico-chemical properties, specific aspects ofdesign and synthesis will be discussed. Particular emphasis will be given to the mostrecent developments, which includes zwitterionic, gemini and polymeric surfactants.Own work of the author of this chapter in the field of polymeric surfactants will behighlighted
Research for publications.docx
No full textThe author's goal in this research is to gain a deeper knowledge of existing UberEats consumers' online meal delivery service ordering experiences. Therefore, the author offers the organization specific ways to attract more consumers and improve customer satisfaction with online meal delivery services based on four elements: delivery service, communication, food packing, and payment system. A qualitative strategy is employed in this study to collect in-depth data by interviewing four respondents. Finally, in order to improve consumer happiness with UberEats' online meal delivery service, delivery time and food packing must be improved. Furthermore, UberEats should place a greater emphasis on customer satisfaction.</p
Prototyping of Human Spare Parts with 3D Printing
Get PDF3D printing technology is a leading technology for producing 3D virtual shape product. It is getting more popular by its accuracy and three dimensional objects. The objective of thesis work is to present a technology review on additive manufacturing processes and to produce prototypes of human spare parts such as organs by using 3D printer. Fused deposition modeling additive manufacturing process is used for prototyping of human organs. Human organs are designed by solid modeling software. Thermoplastic polymer materials like polylactic acid, acrylonitrile butadiene styrene and nylon are used in this process. The Author concludes that fused deposition modeling additive manufacturing process can be simplified by bio printer additive manufacturing process. Human living cell and biomaterial can be used as a material in this process. Organs can be designed by solid modeling software. The scheme is to explore 3D printing technology for producing human artificial organs for saving thousands lives. Further experiment is necessary for functional and clinical use of printed organs
Metamorphic Surface System: An Investigation to understand & to combine flexible boundary conditions with electroactive polymer surface, to develop transformative structure systems for kinetic architecture and kinetic design
No full textArchitecture is often described as 'Frozen Music.' With the advent of machines robotics and advanced materials, this idea is continually changing. From 1970 onwards, many architects, engineers, and futurists have suggested that, to meet present and future challenges, there must be an architecture that is not static and can adapt the changes through kinetics. However, there are still divergences between what we want and where we are. One of the ways to reduce divergence is to make extensive use of kinetics that offers multiplicity of a function and variability of a system which is also the core concept of sustainability and resiliency. Nonetheless, implementing kinetics in architecture was always very challenging due to structural integrity and kinetic system limitations. This research proposes a new kinetic surface system to overcome these limitations and to advance shape memory structural transformations. It investigates a metamorphic surface system composed of elastic boundary conditions, electro-elastic surfaces, and electro-activation. The aim is to develop a kinetically responsive structure for kinetic design. This approach bridges the gap between rigid to fully flexible structures to accommodate more dynamic, harmonious, and kinetic system/s without compromising structural integrity. The research provides detailed investigations of the proposed material and system, its properties, and behaviors, as well as laid the fundamental mathematical relationships among its variables which paved the path for the macro to micro to the large-scale kinetic design of products, automobiles, aviation, bioengineering, media, and architecture, both on the planet and in space, allowing more adaptive, responsive, and intelligent space configuration.Embargo status: Restricted until 09/2025. To request the author grant access, click on the PDF link
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Comparative fates of three structurally distinct PCB congeners in rats and house flies
No full textThe toxicity, biotransformation and biological activities of polychlorinated biphenyls (PCBs) are influenced by the number and position of chlorine atoms on the biphenyl rings. The excretion and tissue retention of three \sp{14}C-labeled structurally distinct lower chlorinated PCBs (2,2\sp\prime,5-tri-, 2,2\sp\prime,4,4\sp\prime-tetra- and 3,3\sp\prime,4,4\sp\prime-tetrachlorobiphenyls) were examined in prepubertal (24-day old) rats following iv injection into the tail vein. Toxicokinetics and enzyme-related toxicities of these PCBs were also examined in female house flies following topical application.The total excretion of 2,2\sp\prime,5-triCB within 72 hours was 62% and 51%, whereas excretion of 3,3\sp\prime,4,4\sp\prime-tetraCB was 22% and 25% and 2,2\sp\prime,4,4\sp\prime-tetraCB was only 6.7% and 10% in male and female rats, respectively. Elimination half-lives of 37.5, 672, and 186 hours for males and 49.2, 351, and 152 hours for females were determined for 2,2\sp\prime,5-triCB, 2,2\sp\prime,4,4\sp\prime-tetraCB and 3,3\sp\prime,4,4\sp\prime-tetraCB, respectively. At 72 hours following dosing, the highest concentrations were generally found in serum, adrenals, fat and ovaries. Much of the 2,2\sp\prime,5-triCB and 3,3\sp\prime,4,4\sp\prime-tetraCB was tightly bound to the tissues and serum; serum-bound CB was associated with serum albumin in vitro, whereas in vivo binding was predominantly to proteins other than serum albumin.In house flies, the rapidly absorbed and excreted 2,2\sp\prime,5-triCB was more toxic to 5-day old flies when the microsomal enzyme levels were highest. Although 2,2\sp\prime,4,4\sp\prime-tetraCB was very acutely toxic, it was slightly less toxic to 5-day old flies. Low absorption of 3,3\sp\prime,4,4\sp\prime-tetraCB probably contributed to its low toxicity at all ages (1-, 5-, and 15-day).The 2,2\sp\prime,5-triCB was very rapidly metabolized to at least 19 different metabolites, whereas 2,2\sp\prime,4,4\sp\prime-tetraCB was metabolized very slowly. The dose dependent half-lives of elimination of 2,2\sp\prime,5-triCB were from 5-8 hours, whereas 2,2\sp\prime,4,4\sp\prime-tetraCB half-lives ranged from 49-112 hours. The absorption of 3,3\sp\prime,4,4\sp\prime-tetraCB was very slow, but metabolism was relatively rapid. Half-lives of elimination of 3,3\sp\prime,4,4\sp\prime-tetraCB ranged from 32 to 280 hours.All three PCBs were absorbed by simultaneous rapid and slow absorption processes, penetrating through the thoracic cuticle and spreading laterally to the head and abdomen, probably through the waxy monolayers. Peak concentrations of 2,2\sp\prime,5-triCB were found in the alimentary canal within 6 hours, whereas 2,2\sp\prime,4,4\sp\prime-tetraCB took longer and the concentration was lower. The slowly absorbed 3,3\sp\prime,4,4\sp\prime-tetraCB reached peak concentrations in the alimentary canal much later (12-48 hours).Made available in DSpace on 2011-05-07T14:08:33Z (GMT). No. of bitstreams: 2
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Angiotensin II induces soluble fms-Like tyrosine kinase-1 release via calcineurin signaling pathway in pregnancy
Get PDFMaternal endothelial dysfunction in preeclampsia is associated with increased soluble fms-like tyrosine kinase-1 (sFlt-1), a circulating antagonist of vascular endothelial growth factor and placental growth factor. Angiotensin II (Ang II) is a potent vasoconstrictor that increases concomitant with sFlt-1 during pregnancy. Therefore, we speculated that Ang II may promote the expression of sFlt-1 in pregnancy. Here we report that infusion of Ang II significantly increases circulating levels of sFlt-1 in pregnant mice, thereby demonstrating that Ang II is a regulator of sFlt-1 secretion in vivo. Furthermore, Ang II stimulated sFlt-1 production in a dose- and time-dependent manner from human villous explants and cultured trophoblasts but not from endothelial cells, suggesting that trophoblasts are the primary source of sFlt-1 during pregnancy. As expected, Ang II-induced sFlt-1 secretion resulted in the inhibition of endothelial cell migration and in vitro tube formation. In vitro and in vivo studies with losartan, small interfering RNA specific for calcineurin and FK506 demonstrated that Ang II-mediated sFlt-1 release was via Ang II type 1 receptor activation and calcineurin signaling, respectively. These findings reveal a previously unrecognized regulatory role for Ang II on sFlt-1 expression in murine and human pregnancy and suggest that elevated sFlt-1 levels in preeclampsia may be caused by a dysregulation of the local renin/angiotensin system
