First Stars III Conference Summary

The understanding of the formation, life, and death of Population III stars, as well as the impact that these objects had on later generations of structure formation, is one of the foremost issues in modern cosmological research and has been an active area of research during the past several years. We summarize the results presented at "First Stars III," a conference sponsored by Los Alamos National Laboratory, the Kavli Institute for Particle Astrophysics and Cosmology, and the Joint Institute for Nuclear Astrophysics. This conference, the third in a series, took place in July 2007 at the La Fonda Hotel in Santa Fe, New Mexico, U.S.A.Comment: 11 pages, no figures; Conference summary for First Stars III, which was held in Santa Fe, NM on July 15-20, 2007. To appear in "Proceedings of First Stars III," Eds. Brian W. O'Shea, Alexander Heger & Tom Abe

Mobile Audience, Social Media, and Action Research: An Examination of Non-Profits and Mobile Engagement

Non-profit organizations in the United States are becoming more dependent on the use of social media accounts, to market to their mobile audiences, because they are free to use. With the constant advancements in technology, True Friends marketing department struggles to keep up with the lack of staff and necessary resources. The researchers chose to investigate how True Friends Organization could improve the quality of their mobile engagement through the analysis of their social media and Google analytics accounts. Specifically, the researchers implemented action research to evaluate if the increased use of Instagram expands True Friends mobile audience. The researchers evaluated how technology helps to create unique cultures amongst mobile audiences, as well as why social media as a medium is so important. Participants of this study included True Friends mobile audiences on Google Analytics, Facebook, Twitter, Pinterest, and Instagram. Their mobile audience consists of participants from California, England, Illinois, Iowa, Minnesota, New York, and Wisconsin. The study meticulously focused on social media as a medium for True Friends to communicate with their mobile audience, and how each of their accounts helps to create a distinct culture

Rooftop and ground standard temperatures: a comparison of physical differences

July 2000.Includes bibliographical references (pages 48-49).Accuracy and continuity of surface air temperature measurements are critical for many meteorological activities including short-term weather forecasting, warnings, and climate monitoring. In the United States and worldwide, most air temperature observations have historically been taken at a height of approximately 1.25 to 1.5 meters above the ground over a grass surface. In the last two decades, there has been a rapid expansion of nonfederal weather station networks to support state, regional and community needs. Many of these new weather stations are located on rooftops for reasons of security or convenience. Mixing these rooftop observations indiscriminately with observations from standard screen-height can pose significant issues for weather forecasting and verification, weather and climate analysis and climate applications such as energy demand planning and forecasting by large public utilities. This study establishes the physical mechanisms which cause a rooftop sensor to have a temperature bias relative to a nearby ground sensor. From a surface energy balance perspective, the physical characteristics of a surface are analyzed and related to temperature bias. This study identifies the surfaces and conditions leading to rooftop temperature bias in both maximum and minimum temperatures. These concepts are verified through both surface radiating temperature measurements and air temperature measurements contrasting roof and ground temperatures. Guidelines are then proposed to establish which roofs are unsuitable for temperature measurements and under what conditions a rooftop is vulnerable to temperature bias. Results indicate that overcast skies lead to small rooftop to ground differences in both surface radiating temperature and air temperature. Observations show differences of approximately 1 degree C or less in radiating temperature and less than 1 degree C in air temperature. An exception was observed where a wall effect led to more than a 2 degree C difference in air temperatures between roof and ground. Clear or partly cloudy skies allow larger rooftop temperature biases to develop. Roof to ground differences in surface radiating temperatures of up to 30 degrees C were observed. Although air temperature measurements were not made at all locations, observations show roof to ground differences of 3 degrees C for radiating temperature differences of 14 degrees C. The potential for even greater roof-ground air temperature differences exists at sites where radiating temperatures are further apart.Supported by the NOAA, National Weather Service, Office of Meteorology under grant NA67RJ0 152 Amend 21

Laser ultrasound measurement of diaphragm thickness, Young’s modulus and Poisson’s ratio in a MEMS device

Laser-generated Lamb waves, coupled with a large bandwidth Michelson interferometer, have been demonstrated to accurately measure the thickness of a MEMS pressure sensor diaphragm in the [110] direction of a silicon wafer. Using the reassigned Gabor time-frequency method to produce group velocity dispersion curves, the technique facilitates the measurement of thickness, Young’s modulus and Poisson’s ratio from just one non-contact measurement. In this investigation, thickness was determined to be 35.01 μm ± 0.18 μm. For comparison, the thickness was measured using an independent optical technique; obtaining a value of 34.60 μm ± 0.27 μm. Values for Young’s modulus and Poisson’s ratio were also determined to be 163 GPa ± 11.7 GPa and 0.351 respectively and these are in good agreement with values found in the literature

Current Trends in Cooperative Finance

In recent years three important trends have become apparent among grain marketing and farm supply cooperatives. These farmer owned firms have been rapidly investing in infrastructure, reformulating profit distribution and equity strategies, and have pursued consolidation with other cooperatives. This manuscript explores the factors contributing to those trends, the implications for cooperatives leaders, and the impacts on farmer members

ECLSS advanced automation preliminary requirements

A description of the total Environmental Control and Life Support System (ECLSS) is presented. The description of the hardware is given in a top down format, the lowest level of which is a functional description of each candidate implementation. For each candidate implementation, both its advantages and disadvantages are presented. From this knowledge, it was suggested where expert systems could be used in the diagnosis and control of specific portions of the ECLSS. A process to determine if expert systems are applicable and how to select the expert system is also presented. The consideration of possible problems or inconsistencies in the knowledge or workings in the subsystems is described

Evidencia del uso agrícola del sitio San Andrés durante el periodo protoclásico

Este articulo examina la evidencia de la ocupación de San Andrés en el periodo protoclásico. San Andrés está ubicado en la parte central del Valle de Zapotitán, en la confluencia de los ríos Sucio y Agua Caliente . Casi todo su conocimiento pertenece a la ocupación del periodo clásico tardío, sin embargo, el sitio fue ocupado antes y después del periodo clásico.Durante el clásico tardío, fue el centro regional primario de la jerarquía política y económica del Valle de Zapotitán . Los campos de cultivo en San Andrés son muy parecidos a los que están cubiertos con la tefra Cuscatlán y a los de Cerén en su forma, la distancia entre los surcos y la altura de los mismos. La ubicación de los campos agrícolas tan cerca de la zona monumental de San Andrés respalda la hipótesis de que su población era mucho menor durante el protoclásico que durante el clásico tardío. Mediante el estudio de los vestigios en campos de cultivo enterrados debajo de varias capas de ceniza volcánica, se puede mejorar el entendimiento de la tecnología agrícola precolombina en El Salvador. También se puede utilizar estos vestigios para entender mejor la población que vivió en el país en los siglos pasados

A diagnostic prototype of the potable water subsystem of the Space Station Freedom ECLSS

In analyzing the baseline Environmental Control and Life Support System (ECLSS) command and control architecture, various processes are found which would be enhanced by the use of knowledge based system methods of implementation. The most suitable process for prototyping using rule based methods are documented, while domain knowledge resources and other practical considerations are examined. Requirements for a prototype rule based software system are documented. These requirements reflect Space Station Freedom ECLSS software and hardware development efforts, and knowledge based system requirements. A quick prototype knowledge based system environment is researched and developed

Heated aquatic microcosms for climate change experiments

Ponds and shallow lakes are likely to be strongly affected by climate change, and by increase in environmental temperature in particular. Hydrological regimes and nutrient cycling may be altered, plant and animal communities may undergo changes in both composition and dynamics, and long-term and difficult to reverse switches between alternative stable equilibria may occur. A thorough understanding of the potential effects of increased temperature on ponds and shallow lakes is desirable because these ecosystems are of immense importance throughout the world as sources of drinking water, and for their amenity and conservation value. This understanding can only come through experimental studies in which the effects of different temperature regimes are compared. This paper reports design details and operating characteristics of a recently constructed experimental facility consisting of 48 aquatic microcosms which mimic the pond and shallow lake environment. Thirty-two of the microcosms can be heated and regulated to simulate climate change scenarios, including those predicted for the UK. The authors also summarise the current and future experimental uses of the microcosms