Understanding Cross-Conjugation for Organic Electronics

Comunicación a congresopi-Conjugated organic molecules have been the focus of interest since they have been probed as potential semiconducting materials,[1] suitable for replacing the widely used silicon technologies. Their structural, optical and conductive properties are now under study to improve their application in organic electronics and to make possible their ad hoc synthesis. In this sense, the knowledge of the pi-electron delocalization is crucial to stablish the relation between the properties and the function, enabling the development of a synthesis guide based on the specific application. The most acknowledged conjugated organic materials are those which present extended, linearlyconjugated pi-systems. [1,2] However, this is not the only way of pi-electron delocalization: homoconjugation, cross-conjugation, curved-conjugation, etc. constitute different electronic designs to achieve new organic materials. There is a relative high abundance in the organic world of cross-conjugated but limited comprehension. [1,2,3] Thus, the understanding of how cross-conjugation works in -electronic systems is of importance. Following this idea, in this project we show 4 different structures which present two perpendicular pi-conjugated paths and how the cross-conjugated property is revealed. On the one hand, two molecules based on thieno[3,4-c]pyrrole-4,6-dione quaterthiophenes[2,3] allow us toaccomplish the subject from the aromatic/quinoidal outlook, and, on the other hand, two molecules with an anthanthrone core make possible the study from the perspective of the substituent groups. [4]Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Security Analysis of Vehicular Ad Hoc Networks (VANET)

Vehicular Ad Hoc Networks (VANET) has mostly gained the attention of today's research efforts, while current solutions to achieve secure VANET, to protect the network from adversary and attacks still not enough, trying to reach a satisfactory level, for the driver and manufacturer to achieve safety of life and infotainment. The need for a robust VANET networks is strongly dependent on their security and privacy features, which will be discussed in this paper. In this paper a various types of security problems and challenges of VANET been analyzed and discussed; we also discuss a set of solutions presented to solve these challenges and problems.Comment: 6 pages; 2010 Second International Conference on Network Applications, Protocols and Service

Race, Gender, Age, and Disproportionate Impact: What Can We Do About the Failure to Protect the Most Vulnerable?

Hard economic times and social conditions are driving a reordering of environmental protection priorities that threatens to sacrifice the most vulnerable groups. Environmental regulatory agencies acknowledge that vulnerable populations face the greatest risk of harm from environmental insult and that these groups are not adequately protected. Although a risk-based prioritization of resources benefits the greatest number of people, such allocation would disadvantage minority communities, which contain disproportionate numbers of sensitive subgroups. Our regulatory bodies must therefore develop new strategies to adequately protect sensitive subgroups identified in minority communities. Part II of this Article looks at some of the considerations that influence the health protection priorities and resource allocations that environmental regulatory agencies make. Part III examines the importance of variation in susceptibility to environmental insult and how minorities, women, and the young are particularly affected. Part IV discusses the economic rationale and available mechanisms for protecting vulnerable subgroups

Cholesteric aggregation at the quinoidal-to-diradical border enabled stable n-doped conductor

Resumen de la comunicaciónSemiconductor materials constitute the heart of solar cells since they are responsible of the photovoltaic effect. For this reason, the search of new materials to improve the efficiency and stability of these devices is on the focus of the organic electronics. These semiconductors are typically formed by p-doped materials. Despite the relative high abundance of molecules suitable for photovoltaic purposes, that is, able of absorbing light and allowing the transport of the new created charges through them, n-doped organic semiconductors are not plentiful due to their well-known ambient instability.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec

Rise of the Renter Nation: Solutions to the Housing Affordability Crisis

Private homeownership cannot serve as our only model for decent, stable housing. While the most recent speculative bubble raised the proportion of homeowners nationwide to 70 percent of all households, this gain was an illusion that vanished as the market collapsed. A longer view reveals that for three decades before the bubble began in the mid-1990s, homeownership rates hovered around 64 percent, despite massive federal and market support. Further, the historic average obscures important and severe racial disparities in homeownership rates, which have never exceeded 50 percent for black and Latino populations. Yet, policy and even much of the progressive analysis of the housing crisis seem incapable of acknowledging -- much less acting on -- these realities. The result is a national dialogue about the housing crisis that all but ignores the growing renter class, where the crisis is concentrated, and retains a myopic focus on private ownership. The following report is a reality check. It attempts to redirect the conversation and provide an agenda for genuine housing security for all