Everything Under the Sun: A Guide to Siting Solar in the Lone Star State

Encouraging energy production using renewable resources is a widely recognized public policy that is promoted by both the federal and state governments in the U.S., and with recent technological advances, renewable-electricity generation is rapidly becoming economically viable. The Energy Information Administration (EIA) forecasts that electricity production from all renewable sources will increase 72% between 2013 and 2040, with the renewable share of total U.S. electricity generation growing from 13% to 18%.1 The future of solar power is especially bright with a projected growth rate of 6.8% per year between 2013 and 2040. If this projection holds true, solar power will far outpace the growth of other renewables. Combined with the Investment Tax Credit (ITC) introduced in 2006, rapid improvements in photovoltaic (PV) solar panel efficiency and dramatic reductions in PV costs are driving a veritable solar boom in the U.S. In fact, the Solar Energy Industries Association (SEIA) reports a 73% decrease in the cost of installing solar since the implementation of the ITC, and anticipates an additional 20,000 Megawatts (MW) of solar generation capacity will come online in the next two years, doubling current U.S. solar capacity. Likewise, the EIA projects that solar power will account for nearly half of the total 109,000MW of renewable-generation-capacity that is expected to be added to the U.S. electricity grid by 2040.The Kay Bailey Hutchison Center for Energy, Law, and Busines

Shuttle remote manipulator system mission preparation and operations

The preflight planning, analysis, procedures development, and operations support for the Space Transportation System payload deployment and retrieval missions utilizing the Shuttle Remote Manipulator System are summarized. Analysis of the normal operational loads and failure induced loads and motion are factored into all procedures. Both the astronaut flight crews and the Mission Control Center flight control teams receive considerable training for standard and mission specific operations. The real time flight control team activities are described

Propagation effects on spread-spectrum mobile satellite systems

In contrast to the situation at L-band, wide bandwidths of 500 MHz or more have been allocated for mobile satellite service at frequencies between 20 and 50 GHz. These broad bandwidths are well suited for the use of spread-spectrum. Certain system considerations about the use of such high frequencies for mobile satellite service are mentioned first, and attention is then given to propagation effects on high-frequency broad-band systems. Attenuation due to rain is a constant at 20 to 50 MHz, but would not be a serious problem if outages occurring for one to three percent of the time, depending on location, are considered to be acceptable. Clear air absorption becomes a significant factor above 40 GHz, but should not exceed 2 dB at a 10 degree elevation angle and frequencies below 40 GHz. Spread-spectrum provides a form of frequency diversity that helps to minimize the effects of multipath

NASA Propagation Information Center

The NASA Propagation Information Center became formally operational in July 1988. It is located in the Department of Electrical and Computer Engineering of the University of Colorado at Boulder. The Center is several things: a communications medium for the propagation with the outside world, a mechanism for internal communication within the program, and an aid to management

NASA propagation information center

The NASA Propagation Information Center became formally operational in July 1988. It is located in the Department of Electrical and Computer Engineering of the University of Colorado at Boulder. The center is several things: a communications medium for the propagation with the outside world, a mechanism for internal communication within the program, and an aid to management

WARC 92 and some thoughts as to its impact on the NASA propagation program

The World Administrative Radio Conference of 1992 (WARC 92) was held in Torremolinos, Spain, 3 Feb. - 3 Mar. 1992. Major topics considered included shortwave broadcasting, mobile and mobile-satellite service, broadcasting satellite service (sound and HDTV), space services above 20 GHz, and space research. Considerable attention was given to the congested 1-3 GHz band in general and to Low Earth Orbit (LEO) Mobile-Satellite Service, including 'little' LEO's operating below 1 GHz and to 'big' LEO's operating above 1 GHz. Significant new allocations were made for generic Mobile-Satellite Services (MSS). Proposals for allocations for uplink power control beacons and for space research received favorable treatment

Examination of Genotypic Variation in Aluminum Tolerance of Populus

Soil acidity and aluminum (Al) toxicity are major factors limiting crop yield and forest productivity worldwide. Hybrid poplar (Populus spp.) was used as a model woody tree species to assess genotypic variation in Al resistance and physiological stress responses to Al. In the first study eight hybrid crosses of P. trichocarpa, P. deltoides and P. nigra were exposed to Al in solution culture. Resistance to Al varied by genotype and hybrid cross, with P. trichocarpa x P. deltoides crosses being most resistant, P. trichocarpa x P. nigra being intermediate and P. deltoides x P. nigra being most sensitive to Al. Total root Al accumulation was not a good indicator of Al resistance/sensitivity. However, the partitioning of Al into apoplastic and symplastic fractions indicated that differences in sensitivity among genotypes were associated with Al uptake into the symplasm. Aluminum treatment increased callose and pectin concentrations of root tips in all genotypes, but more prominently in Al sensitive genotypes/hybrids. In Al sensitive genotypes, higher levels of symplastic Al accumulation correlated with elevated concentrations of citrate, malate, succinate or formate in root tips, whereas organic acid accumulation was not as pronounced in Al resistant genotypes. These findings suggest that exclusion of Al from the symplast is associated with Al resistance. In the second study exudation was examined as a strategy for Al resistance in two poplar genotypes varying in Al tolerance. Increased citrate exudation in the Al tolerant genotype DTAC-7 was found to be related to increases in organically bound Al in solution as well as lower callose accumulation in root tips. A decrease in organic acid (OA) exudation over time was also observed in both genotypes. These findings suggest that, under short term Al exposure, citrate exudation is a viable mechanism to promote Al resistance in poplar genotypes, but also suggests that other strategies may exist in longer term Al exposure. Further screening of Al tolerant poplar genotypes could yield successful candidates to be utilized for sustainable reforestation/reclamation and carbon sequestration projects where soil acidity may limit tree growth

A Strategy for a Successful Church Plant in an Un-churched, yet Spiritual Culture

Planting a church is difficult, especially when the church is planted in a post-Christian culture. Denver, Colorado is this type of culture and has commonly been called “A Church Planter’s Graveyard” by various church planters, church planting network leaders and senior pastors in Denver. According to the North American Mission Board and other reports, Denver is 88-95% un-churched. This writer moved to Denver in the summer of 2013 to plant a church. The goal is to create a different strategy to reach a community of people who are not Christ-followers. This strategy will research former and current Denver church planters. This author will examine growing churches in the Denver area and survey and interview at least 15 previous or current church planters. Through the research, this project will offer a strategy for church planting in a difficult region

European Springtails Orchesella cincta (L.) and O. villosa (L.) (Collembola: Entomobryidae): Vagabond Species of the Nearctic Region

North American specimens of the European invasive springtail Orchesella cincta (L.) were compared to several published European haplotypes in a phylogenetic framework using likelihood methods based on a portion of cytochrome oxidase II (cox2). Our analyses provide direct evidence of at least two distinct introductions of this invasive to North America from different regions of Europe. Additional introduction events cannot be ruled out because detection is limited by extremely low sequence divergence among populations inhabiting different regions of the continent. Orchesella villosa (L.), another invasive from Europe, is another candidate for multiple introductions. Herein we include the cox2 sequence from single specimens of O. villosa from Maine and Oregon. Although these two specimens are identical in sequence, they differ from a published sequence from a European specimen by 15%, indicating significant undocumented genetic variation in the natal range of O. villosa. Additional sampling of Nearctic populations of O. villosa might reveal the same situation reported herein for O. cincta