Paper Session III-A - Electrolytic Oxygen Enrichment Using Supernoxide Ion in a Solid Polymer Membrane Electrolyte

Electrochemical cells are among the technologies under consideration for gaseous oxygen concentration or enrichment in both aerospace and civilian applications. Current electrochemical technology involves the electro-reduction of molecular oxygen, O2, to water at one electrode, and the electro-oxidation of water to oxygen at the other. In terms of the overall chemical mechanism, this is a 4-electron, 4-proton process. From an economic point of view, one would like to use as little energy as possible to effect oxygen transport. The simplest possible mechanistic scenario would be if the O-, reduction product is the superoxide ion, O2~, involving only a single electron exchange: O2 + e = O 2 Superoxide anion can be produced electrochemically via reduction of O 2 in an organic aprotic solvent, such as dimethyl formamide or acetonitrile. Moreover, production of superoxide via electrolysis is electrochemically reversible (i.e., the forward and reverse reaction is so rapid that it proceeds under diffusion control near the thermodynamic potential). Considerable energy savings may be realized if electrochemical O, transport could be performed using superoxide ion

Technical Paper Session I-B - The Prospect of producing Breathing Oxygen, Pure Hydrogen and propellants from the Martian Atmosphere

The cost of manned Mars missions could be significantly reduced if O2, water, and propellant were to be extracted from the CO2-rich Martian atmosphere. The objectives of this paper are to explore techniques of producing pure O2 from the Martian atmosphere, and examine chemically stable reactors for H2 production. A method for obtaining O2 on Mars is a high temperature solid oxide electrolysis of yttriastabilized zirconia (YSZ) where CO2 is electrochemically reduced to CO and pure O2 is evolved from the opposite electrode compartment. An electrochemical cell will be demonstrated for CO2 electrolysis with concomitant production of pure O2 under partial pressures commensurate with the Martian atmosphere. Also, this paper investigates the impact of the In-Situ Resource Utilization for Mars mission by providing ultra pure H2 and a chemically stable reactor in CO2- rich mixtures needed to achieve long range mobility on Mars. The fabricated rector is permeable to H2 with infinite selectivity, chemically stable in CO2, and does not require external electrical circuit. In addition, a system-level modeling will be presented to estimate cost, size, energy, power, weight, and volume equipment of a full-scale Mars mission

Development of a Hydrogen Evolving Photocatalytic Membrane

AbstractPhotoelectrochemical cells have a fundamental problem in that the thin, closely spaced laminar phases normally comprising an electrochemical cell do not readily lend themselves to penetration by external light as part of a solar energy conversion scheme. This has led to novel cell configurations that are more amenable to solar absorption. We are working on a “photocatalytic membrane”, where a single sheet comprised of two semiconductor layers combine their photopotentials to achieve a water-splitting voltage. A schematic depicting how the membrane might be configured is shown below. Light absorption in respective semiconductor layers drives oxidation on one side of the membrane and reduction on the other. Perforations filled with ion-exchange polymer allow the flow of ionic charge carriers (hydronium ion in acidic media) between anolyte and catholyte compartments. To fabricate such a photocatalytic membrane, a sequence of deposition steps must be developed where each subsequent step is compatible with the previous ones. Our strategy is to build n-type and p-type layers on opposite sides of a thin, perforated metallic sheet. A prototype device involving electrodeposition of n-WO3 and p-CdTe on mechanically perforated stainless #304 has been fabricated. A net photovoltage of 0.8 V in aqueous acidic electrolyte was estimated

A national inventory and analysis of US transfer of development rights programs

Transfer of development rights (TDR) programs shift development intensity between land parcels. Jurisdictions, most commonly local municipal or county governments, employ TDR to protect resources such as farmland or historical properties and to encourage infill and redevelopment where deemed appropriate. However, while championed by economists and others seeking to reduce conflicts between land development and preservation, TDR program adoption has varied widely across the US. What demographic, economic, or environmental factors are associated with TDR program establishment? This paper describes a census of 375 TDR programs in the United States, documenting primary program attributes and adoption year and categorizing their functions and typology. Using logistic regression, we analyze program spatial patterns and factors predicting program implementation. We find that areas that are coastal, more liberal, have higher home values, in home-rule states, and in states with state-wide growth management programs, are all significantly more likely to implement TDR programs

Sex ratios and the city: Secondary offspring sex ratios, parental corticosterone, and parental body condition in an urban-adapted bird

The Trivers–Willard hypothesis states that mothers should adjust their offspring sex ratio according to their own condition and the environment they face during breeding. Past tests of this hypothesis have focused on how natural variation in weather, food availability, or predation pressure shapes sex allocation trade-offs. However, anthropogenic activities, such as urbanization, can alter all of the above characteristics presenting animals with novel challenges in optimizing their brood sex ratio. Previous research has examined how urban living influences individual body condition in several bird taxa, but few have explored subsequent impacts on secondary offspring sex ratio. One likely mediator of the link between environmental conditions, parental condition, and sex ratios is corticosterone (CORT), the primary glucocorticoid in birds. Research on CORT’s influence on sex ratios has focused solely on maternal CORT. However, for species with biparental care, paternal CORT or the similarity of maternal and paternal phenotypes may also help ensure that offspring demand matches parental care quality. To test these hypotheses, we explore offspring secondary sex ratios in European starlings (Sturnus vulgaris). We did not find an effect of site or parental body condition on the production of the more costly sex (males). Instead, we found preliminary evidence suggesting that the similarity of maternal and paternal CORT levels within a breeding pair may increase the likelihood of successfully fledging sons. Maternal and paternal CORT were not significant predictors of secondary sex ratio, suggesting that parental similarity, rather than parental CORT alone, could play a role in shaping secondary offspring sex ratios, but additional work is needed to support this pattern. Starlings are considered an urban-adapted species, making them a compelling model for future studies of the relationship between urbanization, parental body condition, and sex ratios

National Telemedicine Initiatives: Essential to Healthcare Reform

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/78116/1/tmj.2009.9960.pd

The Empirical Foundations of Telemedicine Interventions for Chronic Disease Management

The telemedicine intervention in chronic disease management promises to involve patients in their own care, provides continuous monitoring by their healthcare providers, identifies early symptoms, and responds promptly to exacerbations in their illnesses. This review set out to establish the evidence from the available literature on the impact of telemedicine for the management of three chronic diseases: congestive heart failure, stroke, and chronic obstructive pulmonary disease. By design, the review focuses on a limited set of representative chronic diseases because of their current and increasing importance relative to their prevalence, associated morbidity, mortality, and cost. Furthermore, these three diseases are amenable to timely interventions and secondary prevention through telemonitoring. The preponderance of evidence from studies using rigorous research methods points to beneficial results from telemonitoring in its various manifestations, albeit with a few exceptions. Generally, the benefits include reductions in use of service: hospital admissions/re-admissions, length of hospital stay, and emergency department visits typically declined. It is important that there often were reductions in mortality. Few studies reported neutral or mixed findings.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140284/1/tmj.2014.9981.pd

Intermatrix synthesis: easy technique permitting preparation of polymer-stabilized nanoparticles with desired composition and structure

The synthesis of polymer-stabilized nanoparticles (PSNPs) can be successfully carried out using intermatrix synthesis (IMS) technique, which consists in sequential loading of the functional groups of a polymer with the desired metal ions followed by nanoparticles (NPs) formation stage. After each metal-loading-NPs-formation cycle, the functional groups of the polymer appear to be regenerated. This allows for repeating the cycles to increase the NPs content or to obtain NPs with different structures and compositions (e.g. core-shell or core-sandwich). This article reports the results on the further development of the IMS technique. The formation of NPs has been shown to proceed by not only the metal reduction reaction (e.g. Cu0-NPs) but also by the precipitation reaction resulting in the IMS of PSNPs of metal salts (e.g. CuS-NPs)

Mouse models of preeclampsia with preexisting comorbidities

Preeclampsia is a pregnancy-specific condition and a leading cause of maternal and fetal morbidity and mortality. It is thought to occur due to abnormal placental development or dysfunction, because the only known cure is delivery of the placenta. Several clinical risk factors are associated with an increased incidence of preeclampsia including chronic hypertension, diabetes, autoimmune conditions, kidney disease, and obesity. How these comorbidities intersect with preeclamptic etiology, however, is not well understood. This may be due to the limited number of animal models as well as the paucity of studies investigating the impact of these comorbidities. This review examines the current mouse models of chronic hypertension, pregestational diabetes, and obesity that subsequently develop preeclampsia-like symptoms and discusses how closely these models recapitulate the human condition. Finally, we propose an avenue to expand the development of mouse models of preeclampsia superimposed on chronic comorbidities to provide a strong foundation needed for preclinical testing