Design and Optimization of Composite Gyroscope Momentum Wheel Rings

Stress analysis and preliminary design/optimization procedures are presented for gyroscope momentum wheel rings composed of metallic, metal matrix composite, and polymer matrix composite materials. The design of these components involves simultaneously minimizing both true part volume and mass, while maximizing angular momentum. The stress analysis results are combined with an anisotropic failure criterion to formulate a new sizing procedure that provides considerable insight into the design of gyroscope momentum wheel ring components. Results compare the performance of two optimized metallic designs, an optimized SiC/Ti composite design, and an optimized graphite/epoxy composite design. The graphite/epoxy design appears to be far superior to the competitors considered unless a much greater premium is placed on volume efficiency compared to mass efficiency

Political legitimacy as an existential predicament

This essay contributes to developing a new approach to political legitimacy by asking what is involved in judging the legitimacy of a regime from a practical point of view. It is focused on one aspect of this question: the role of identity in such judgment. I examine three ways of understanding the significance of identity for political legitimacy: the foundational, associative, and agonistic picture. Neither view, I claim, persuasively captures the dilemmas of judgment in the face of disagreement and uncertainty about who “I” am and who “we” are. I then propose a composite, pragmatic picture. This view casts the question of political legitimacy as an existential predicament: it is fundamentally a question about who you are—both as a person and as a member of collectives. The pragmatic picture integrates rational, prudential, and ethical qualities of good judgment that were heretofore associated with mutually exclusive ways of theorizing legitimacy. It also implies that the question of legitimacy cannot be resolved philosophically.Political Philosophy and Ethic

Language and legitimacy: Is pragmatist political theory fallacious?

Eva Erman and Niklas Möller have recently criticised a range of political theorists for committing a pragmatistic fallacy, illicitly drawing normative conclusions from politically neutral ideas about language. This paper examines their critique with respect to one of their primary targets: the pragmatist approach to political legitimacy that I proposed in earlier work, which draws on Robert Brandom’s theory of language. I argue that the charge relies on a misrepresentation of the role of pragmatist ideas about language in my analysis of legitimacy. Pragmatism’s significance for thinking about political legitimacy does not lie in the normative conclusions it justifies but in the way it reorients our thinking towards political practice. This raises the deeper question of what we are to expect from a theory of legitimacy. I argue that Erman and Möller presuppose a widely held but unduly restrictive conception of what a normative theory of legitimacy consists in and that pragmatism can broaden the scope of enquiry: a theory of legitimacy should not focus narrowly on the content and justification of criteria, but more fundamentally aim to explicate the forms of political activity in which such criteria are at stake.Political Philosophy and Ethic

Isolation and Characterization of Larvicidal Phenolic Acids from Kotschya thymodora Leaves

Malaria is a vector borne disease responsible for high morbidity, mortality and poverty in many tropical and subtropical countries. The disease is transmitted through a bite from an infected female Anopheles mosquito, amongst which Anopheles gambiae s.s serves as the most prevalent vector. The control of An. gambiae s.s population can therefore lead to a reduction in malaria spreading. Previous studies have reported the crude  extracts of Kotschya thymodora to be active against the larvae of An. gambiae s.s and Culex quinquefasciatus. In this report the phytochemical study on the crude aqueous ethanolic extract of K. thymodora leaves led to isolation of vanillic acid (1) and protocatechuic acid (2). The structures of these compounds and mosquitoes larvicidal activity against An. gambiae s.s were established by using spectroscopic techniques and WHO protocol of 1996 respectively. The two phenolic acids exhibited a moderate mosquito larvicidal activity with LC50 of 77.35 μg/mL (vanillic acid, 1) and 62.4 μg/mL (protocatechuic acid, 2) after 48 hrs exposure time. This is the first report on the isolation of the two phenolic acids from plants belonging to the genus Kotschya and their larvicidal potential against An. gambiae s.s. Keywords: larvicidal activity, vanillic acid, protocatechuic acid, Anopheles gambiae s.s and Kotschya thymodor

Public health insurance and entry into self-employment

We estimate the impact of a differential treatment of paid employees versus self-employed workers in a public health insurance system on the entry rate into entrepreneurship. In Germany, the public health insurance system is mandatory for most paid employees, but not for the selfemployed, who usually buy private health insurance. Private health insurance contributions are relatively low for the young and healthy, and until 2013 also for males, but less attractive at the other ends of these dimensions and if membership in the public health insurance allows other family members to be covered by contribution-free family insurance. Therefore, the health insurance system can create incentives or disincentives to starting up a business depending on the family’s situation and health. We estimate a discrete time hazard rate model of entrepreneurial entry based on representative household panel data for Germany, which include personal health information, and we account for non- random sample selection. We estimate that an increase in the health insurance cost differential between self-employed workers and paid employees by 100 euro per month decreases the annual probability of entry into selfemployment by 0.38 percentage points, i.e. about a third of the average annual entry rate. The results show that the phenomenon of entrepreneurship lock, which an emerging literature describes for the system of employer provided health insurance in the USA, can also occur in a public health insurance system. Therefore, entrepreneurial activity should be taken into account when discussing potential health care reforms, not only in the USA and in Germany

Comment to “Neoproterozoic magmatic arc systems of the central Ribeira belt, SE-Brazil, in the context of the West-Gondwana pre-collisional history: A review”

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Relationship between the Composition of Flavonoids and Flower Colors Variation in Tropical Water Lily (Nymphaea) Cultivars

Water lily, the member of the Nymphaeaceae family, is the symbol of Buddhism and Brahmanism in India. Despite its limited researches on flower color variations and formation mechanism, water lily has background of blue flowers and displays an exceptionally wide diversity of flower colors from purple, red, blue to yellow, in nature. In this study, 34 flavonoids were identified among 35 tropical cultivars by high-performance liquid chromatography (HPLC) with photodiode array detection (DAD) and electrospray ionization mass spectrometry (ESI-MS). Among them, four anthocyanins: delphinidin 3-O-rhamnosyl-5-O-galactoside (Dp3Rh5Ga), delphinidin 3-O-(2″-O-galloyl-6″-O-oxalyl-rhamnoside) (Dp3galloyl-oxalylRh), delphinidin 3-O-(6″-O-acetyl-β-glucopyranoside) (Dp3acetylG) and cyanidin 3- O-(2″-O-galloyl-galactopyranoside)-5-O-rhamnoside (Cy3galloylGa5Rh), one chalcone: chalcononaringenin 2′-O-galactoside (Chal2′Ga) and twelve flavonols: myricetin 7-O-rhamnosyl-(1→2)-rhamnoside (My7RhRh), quercetin 7-O-galactosyl-(1→2)-rhamnoside (Qu7GaRh), quercetin 7-O-galactoside (Qu7Ga), kaempferol 7-O-galactosyl-(1→2)-rhamnoside (Km7GaRh), myricetin 3-O-galactoside (My3Ga), kaempferol 7-O-galloylgalactosyl-(1→2)-rhamnoside (Km7galloylGaRh), myricetin 3-O-galloylrhamnoside (My3galloylRh), kaempferol 3-O-galactoside (Km3Ga), isorhamnetin 7-O-galactoside (Is7Ga), isorhamnetin 7-O-xyloside (Is7Xy), kaempferol 3-O-(3″-acetylrhamnoside) (Km3-3″acetylRh) and quercetin 3-O-acetylgalactoside (Qu3acetylGa) were identified in the petals of tropic water lily for the first time. Meanwhile a multivariate analysis was used to explore the relationship between pigments and flower color. By comparing, the cultivars which were detected delphinidin 3-galactoside (Dp3Ga) presented amaranth, and detected delphinidin 3′-galactoside (Dp3′Ga) presented blue. However, the derivatives of delphinidin and cyanidin were more complicated in red group. No anthocyanins were detected within white and yellow group. At the same time a possible flavonoid biosynthesis pathway of tropical water lily was presumed putatively. These studies will help to elucidate the evolution mechanism on the formation of flower colors and provide theoretical basis for outcross breeding and developing health care products from this plant

Hydrothermal dolomitization of basinal deposits controlled by a synsedimentary fault system in Triassic extensional setting, Hungary

Dolomitization of relatively thick carbonate successions occurs via an effective fluid circulation mechanism, since the replacement process requires a large amount of Mg-rich fluid interacting with the CaCO3 precursor. In the western end of the Neotethys, fault-controlled extensional basins developed during the Late Triassic spreading stage. In the Buda Hills and Danube-East blocks, distinct parts of silica and organic matter-rich slope and basinal deposits are dolomitized. Petrographic, geochemical, and fluid inclusion data distinguished two dolomite types: (1) finely to medium crystalline and (2) medium to coarsely crystalline. They commonly co-occur and show a gradual transition. Both exhibit breccia fabric under microscope. Dolomite texture reveals that the breccia fabric is not inherited from the precursor carbonates but was formed during the dolomitization process and under the influence of repeated seismic shocks. Dolomitization within the slope and basinal succession as well as within the breccia zones of the underlying basement block is interpreted as being related to fluid originated from the detachment zone and channelled along synsedimentary normal faults. The proposed conceptual model of dolomitization suggests that pervasive dolomitization occurred not only within and near the fault zones. Permeable beds have channelled the fluid towards the basin centre where the fluid was capable of partial dolomitization. The fluid inclusion data, compared with vitrinite reflectance and maturation data of organic matter, suggest that the ascending fluid was likely hydrothermal which cooled down via mixing with marine-derived pore fluid. Thermal gradient is considered as a potential driving force for fluid flow