Low-Erosion Nozzle Materials for Long-Duration Hybrid Rocket Burns

Hybrid rocket systems, which employ a solid fuel grain and a liquid oxidizer, are a low-cost and environmentally friendly alternative to traditional rocket systems. However, hybrid rockets suffer from an increased nozzle throat erosion rate, which impacts motor performance and reliability. To address this issue several materials and low-erosion nozzle configurations were tested. The results of the testing campaign produced a nozzle that reduce the throat erosion rate five-fold

Unlocking the Next Generation of Nano-Satellite Missions with 320 Mbps Ka-Band Downlink: On-Orbit Results

Relatively low downlink data rates have historically limited the scientific and commercial return from CubeSats and SmallSats. As the capability of payloads for these satellites continues to increase, high-speed downlink capability is required to realize the increasing potential from these systems. In this paper we present the on-orbit results of our high-speed Ka-band transmitter operating aboard the twin Corvus-BC3 and Corvus-BC4 6U CubeSats. The 1-U form factor Ka-band system enables the unprecedented data return from a multi-spectral imager in this class of spacecraft. We highlight the spacecraft design and operational challenges that have been overcome on these missions that will enable high-speed downlink on any CubeSat or SmallSat. While the pointing requirements for this Ka-band downlink are readily achievable by today’s small satellites, we discuss some of the hidden complexities on both the attitude determination and control system (ADCS) as well as on the ground segment. Currently in-place ground infrastructure, including a 2.8 m dish at a downlink station in Svalbard, Norway, has enabled rapid commissioning and on-demand downlink several times a day for these sun-synchronous spacecraft. This paper includes flight data from early commission to routine operation at high-data rates. We believe the lessons learned on these missions will be valuable for other CubeSat developers that plan on moving away from UHF, S-band, and X-band and into the realm of millimeter microwave frequencies (such as 27 GHz)

Channel Movement, Error Analysis, and Impacts for Neighboring Landowners: A Lower Bear River, UT Case Study

The Bear River Fellows program is a unique learning experience for undergraduate students giving hands-on experience in collecting, synthesizing, and analyzing environmental and ecological data. The Bear River is an important resource that provides water to farms, reservoirs, wetlands, wildlife, and hydropower generation. Because of the river’s value, it is important to understand how the Bear River channel moves and how that affects the surrounding landscape, which is a topic of interest for local land owners but especially conservationists in protecting wetlands and river ecology. We collected hydrological, topologic, and vegetative data from three persisting research sites along an 8 mile stretch of the Bear River, two along the river main stem between Idaho-Utah state line and Cutler reservoir with the first at the Bear River Bottoms near Morton and the second is just below the confluence of the Bear and the Cub Rivers, a major tributary, and a site on the Cub River In the study of these sites, we developed water level, river bank surveys, riparian zones delineation, and river bed contours using an Acoustic Doppler Current Profiler (ADCP) and transom surveying equipment. We used the data to develop multi-year cross sectional views of each research site providing a graphical view of the river cross section. Data that was collected by previous fellows in 2012 and 2013 was added to the cross section picture to observe how the river has changing over the past several years. The results of this multi-year view shows how the river has shifted and erosion on riparian zone around the river. The erosion is clearly visible on steep banks, at the Morton study site six feet of erosion took place laterally on steep bank. This shift of the river and its flow is useful to understand the river’s ecology, the impact that small changed to the river have on wildlife, and assist local land owners and conservationists in maintaining the Bear River and its wetlands

Measuring the Eco-Hydrological Performance of the Lower Bear River Basin through Experiential Learning – The Bear River Fellows Program

Measuring and evaluating the performance of river systems necessarily requires understanding the variety of environmental and ecological variables driving the decision-making process in managing river basins. Such variables are best understood with field measurements, data analysis and computational modeling. The Department of Civil and Environmental Engineering at Utah State University (USU), through a National Science Foundation project, has partnered with the Outdoor Recreation, and Parks and Recreation programs at USU to offer the Bear River Fellows Program - a new, unique river-based experiential learning opportunity for 5 freshmen Fellows to receive first-hand experience in collecting, synthesizing and analyzing environmental and ecological metrics. The Fellows collected field measurements and examined environmental and ecological variables from three different sites along the Lower Bear River between the Idaho-Utah state line and Cutler dam. Data collected includes flow measurements, channel cross section topology, riparian vegetation, beaver activity, and human-caused inflows and diversions. This poster presents the findings of the data analysis for one site at the confluence of the Bear and Cub Rivers. Fellows provide their insights related to their hydrological and ecological observations

Geographic Distribution: \u3ci\u3eAnolis sagrei\u3c/i\u3e (Brown Anole). USA: Arizona.

We discovered the first distributional records for the exotic, Caribbean lizard, Anolis sagrei (Brown Anole), in Arizona

Differential cross section measurements for the production of a W boson in association with jets in proton–proton collisions at √s = 7 TeV

Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb[superscript −1]. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph + pythia and sherpa, and to next-to-leading-order calculations from BlackHat + sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio

Juxtaposing BTE and ATE – on the role of the European insurance industry in funding civil litigation

One of the ways in which legal services are financed, and indeed shaped, is through private insurance arrangement. Two contrasting types of legal expenses insurance contracts (LEI) seem to dominate in Europe: before the event (BTE) and after the event (ATE) legal expenses insurance. Notwithstanding institutional differences between different legal systems, BTE and ATE insurance arrangements may be instrumental if government policy is geared towards strengthening a market-oriented system of financing access to justice for individuals and business. At the same time, emphasizing the role of a private industry as a keeper of the gates to justice raises issues of accountability and transparency, not readily reconcilable with demands of competition. Moreover, multiple actors (clients, lawyers, courts, insurers) are involved, causing behavioural dynamics which are not easily predicted or influenced. Against this background, this paper looks into BTE and ATE arrangements by analysing the particularities of BTE and ATE arrangements currently available in some European jurisdictions and by painting a picture of their respective markets and legal contexts. This allows for some reflection on the performance of BTE and ATE providers as both financiers and keepers. Two issues emerge from the analysis that are worthy of some further reflection. Firstly, there is the problematic long-term sustainability of some ATE products. Secondly, the challenges faced by policymakers that would like to nudge consumers into voluntarily taking out BTE LEI

Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good