54 Works

Simple Simulation Model for Exploring the Effects of Solvent and Structure on Asphaltene Aggregation

N. J. H. Dunn, B. Gutama & W.G. Noid
Asphaltenes are operationally defined as the fraction of crude oil that is soluble in toluene but insoluble in n-heptane. According to the Yen–Mullins model, typical asphaltenes are relatively small molecules consisting of a single aromatic core flanked by aliphatic chains. The Yen–Mullins model posits that asphaltene aggregation proceeds via a hierarchical mechanism involving small nanoaggregates with stacked aromatic cores surrounded by a corona of aliphatic tails. In this work, we introduce a coarse-grained (CG) model...

ISR - Phil Erickson, MIT/Haystack Observatory. (2013)

L.R. Dinsmore
The period of Incoherent Scatter Radar (ISR) observation extended between 12:42 UT May 6th and 19:47 UT May 8th, 2013. The Millstone Hill (MH) ISR system contains two radar dishes with one (the Zenith beam) having fixed pointing at an 88° beam elevation, and the other pointed parallel-B (MISA: the MH Steerable Antenna), with an azimuth angle of 165.8° and an elevation angle of 66.26°, at an altitude of 250 kilometers based on the IGRF...

Carbon isotope record of trace n-alkanes in a continental PETM section recovered by the Bighorn Basin Coring Project (BBCP)

Francesca A. McInerney, llison A. Baczynski, K. H. Freeman & S. L. Wing
Continental sedimentary records of early Paleogene hyperthermals are typically limited to weathered, often discontinuous, outcrop exposures. In 2011, the Bighorn Basin Coring Project collected the first continuous terrestrial records of the Paleocene-Eocene Thermal Maximum (PETM) in the Bighorn Basin, Wyoming. Organic matter preservation was poor during the PETM, even in core material. Concentrations of leaf waxes during the PETM are too low for compound-specific carbon isotope analysis by conventional means. However, the recent development of...

Analysis of BMP implementation, performance, and maintenance in Spring Creek, an agriculturally-influenced watershed in Pennsylvania, 2006-2009

R. P. Brooks
Assessing the performance of conservation BMPs in agricultural watersheds across the U.S. is extraordinarily difficult because of the diversity of conservation practices, the variety of hydrogeomorphic (HGM) settings in which they are implemented, and the breadth of geographic regions involved. Spring Creek watershed, an intensively studied 11-digit HUC watershed in central Pennsylvania (see Figure 1), has the necessary long-term data on water quality for assessing a suite of BMPs in an agricultural watershed. Our investigative...

Pocono Birds: Presence and Proportion on Lakes, 1991

R. P. Brooks
In 1991, we conducted a pilot study to test a method for sampling avian communities on a series of lakes in northeastern Pennsylvania and to determine whether differences between undisturbed and disturbed sites could be detected from a census period consisting of two surveys taken during the breeding season. At the time, we were seeking to determine whether birds could serve as adequate indicators of changes in the condition of a variety of aquatic resources,...

Innate Immune Genes Associated with Newcastle Disease Virus Load in Chick Embryos from Inbred and Outbred Lines

M. Schilling, S. Memari, I. Cattadori, R. Katani, A.P. Muhairwa, J. Buza & V. Kapur

Model output for determining sector-based CO2 emissions in both pseudodata and real-data inversion analyses of Indianapolis for January-April 2015.

B. Nathan, T. Lauvaux, J. Turnbull & K. Gurney
t We assimilate multiple trace gas species within a single high-resolution Bayesian inversion system to optimize CO2ff emissions for individual source sectors. Starting with carbon monoxide (CO), an atmospheric trace gas with fairly well-known emissions, we use emission factors of CO and CO2ff (called RCO) defined for each source sector to enable us to jointly use CO and CO2 atmospheric mole fractions to constrain CO2ff sectoral emissions. We first show that our combined CO-CO2 inversion...

Shale anisotropy and natural hydraulic fracture propagation: An example from the Posidonienschiefer, Germany

J.N. Hooker, M. Ruhl, A.J. Dickson, L.N. Hanson, E. Idiz, S.P. Hesselbo & J. Cartwright
Cores recovered from the Posidonienschiefer (Posidonia Shale) in the Lower Saxony Basin, Germany, contain calcite filled fractures (veins) at low angle to bedding. The veins preferentially form where the shale is both organic rich and thermally mature, supporting previous interpretations that the veins formed as hydraulic fractures in response to volumetric expansion of organic material during catagenesis. Despite the presence of hydrocarbons during fracturing, the calcite fill is fibrous and so the veins appear to...

Electrodynamic Levitation Diffusion Chamber Measurements of the Mass Growth of Homogeneously-Nucleated Ice Crystals Grown from the Vapor

G. Pokrifka, A. Moyle & J.Y. Harrington
This data set comprises individual time-series for ice crystals grown in an electrodynamic levitation diffusion chamber at temperatures between -36C and -44C. Descriptions of the chamber and experiments can be found in Pokrifka (2018). Experiments were conducted by freezing small (approximately 10 micrometer radius) droplets homogeneously. Frozen droplets were levitated in the diffusion chamber and grown in a constant temperature, pressure, and supersaturation environment. The voltage ratio needed to levitate the particle was recorded as...

Topographically-based Landscape-scale Ecological Mapping in Pennsylvania

N. Kong & W. L. Myers
With emphasis on sustainable ecosystem management, ecological mapping at landscape scale provides basic information about the nature and distribution of ecosystems for natural resources management, planning, monitoring and assessment. Landtype association (LTA) and ecological landtype (ELT) are two landscape scales of ecological units in a hierarchical ecological classification system developed by the USDA-Forest Service for use in ecosystem management. LTA is a complex of complementary landscape components (ecological landtypes) that combine through spatial adjacency to...

PA Explorer: Terrabyte Image

W. L. Myers
The Terrabyte images are extractives from Landsat Thematic Mapper images through the SpectraPlex process. This process does not permit the full restoration of the original scene. The SpectraPlex process takes multiple bands of original image data and compresses them to 255 cluster units using isodata as a cluster mechanism. The result of the process is an image layer of cluster numbers with an accompanying table of band means by cluster number. Color rendition: the shade...

Pennsylvania Gap analysis program, Fish habitat models -90meter

W. L. Myers, R. P. Brooks & J. A. Bishop
This layer represents a potential habitat model for Fish in Pennsylvania at 90 meter resolution. The model associates occurrence of suitable habitat with key environmental factors that can be mapped over the entire region. These key factors include vegetative land cover, presence of human activity, elevation, topographic position, wetland characteristics and stream size and proximity. Areas of potential species presence were tabulated based on current and historical information and a series of conditional statements proceeded...

Pennsylvania Gap analysis program, Herpetilie habitat models -90meter

W. L. Myers, R. P. Brooks & J. A. Bishop
This layer represents a potential habitat model for Herpetilies in Pennsylvania at 90 meter resolution. The model associates occurrence of suitable habitat with key environmental factors that can be mapped over the entire region. These key factors include vegetative land cover, presence of human activity, elevation, topographic position, wetland characteristics and stream size and proximity. Areas of potential species presence were tabulated based on current and historical information and a series of conditional statements proceeded...

Pennsylvania Gap analysis program, Herpetilie habitat models -30meter

W. L. Myers, R. P. Brooks & J. A. Bishop
This layer represents a potential habitat model for Herpetilies in Pennsylvania at 30 meter resolution. The model associates occurrence of suitable habitat with key environmental factors that can be mapped over the entire region. These key factors include vegetative land cover, presence of human activity, elevation, topographic position, wetland characteristics and stream size and proximity. Areas of potential species presence were tabulated based on current and historical information and a series of conditional statements proceeded...

Pennsylvania Gap analysis program, Avian habitat models -90meter

W. L. Myers, R. P. Brooks & J. A. Bishop
This layer represents a potential habitat model for birds in Pennsylvania at 90 meter resolution. The model associates occurrence of suitable habitat with key environmental factors that can be mapped over the entire region. These key factors include vegetative land cover, presence of human activity, elevation, topographic position, wetland characteristics and stream size and proximity. Areas of potential species presence were tabulated based on current and historical information and a series of conditional statements proceeded...

Shale Network - A Network of Shale Water Researchers: Compiled Data Set from Wen et al. ES&T (2018), 52 (12), pp 7149-7159

Susan L. Brantley, L. Zi, T. Wen, M. Gonzales, G. Zheng, X. Niu & A. Herman
This data set is part of the Shale Network database and has been discussed in the publication “Wen, T., Niu, X., Gonzales, M., Zheng, G., Li, Z., Brantley, S.L., 2018. Big Groundwater Data Sets Reveal Possible Rare Contamination Amid Otherwise Improved Water Quality for Some Analytes in a Region of Marcellus Shale Development. Environ. Sci. Technol. 52 (12), 7149–7159. https://doi.org/10.1021/acs.est.8b01123”. The Shale Network is a project funded by the National Science Foundation to help scientists...

TEC - Anthea Coster, MIT/Haystack Observatory. (2013)

L. R. Dinsmore
Our raw global Global Positioning System (GPS) data were taken and archived at MH. The GPS-Total Electron Content (TEC) dataset contains the time of observation, the slant-path TEC (sTEC) in TECU (10^16 e-/m^2), and the longitude and latitude of the propagation path pierce point at 325 km in altitude. The GPS-TEC dataset effectively detects F region activity, since the peak electron density in the F region and ionosphere is also around 300 km. Using the...

Manure decreases herbivore performance but increases early-season damage on corn in the greenhouse and field

E. Rown & J.F. Tooker
Many farmers use manure as an alternative to inorganic fertilizer. Previous research has shown that manure can decrease plant susceptibility to herbivores, but the mechanisms remain unclear. To determine how manure affects herbivore performance in a greenhouse setting, we fertilized corn with stacked cow manure or an equivalent amount of NPK fertilizer and measured caterpillar development, plant nutritional content, and defenses. After four weeks of growth, we allowed fall armyworm (Spodoptera frugiperda) or black cutworm...

Island Rainfall Enhancement in the Maritime Continent

J.H. Ruppert & X. Chen
The hypothesis that the islands of the Maritime Continent (MC) enhance total rainfall and time-mean upward motion is tested using a convection-permitting regional model. Sensitivity experiments with the islands removed greatly diminish both rainfall and upward motion, supporting the hypothesis. We examine the individual factors in this enhancement, isolating the impacts of the diurnal cycle from those of basic-state (i.e., constant) forcing of orography and the land surface. We find that the basic-state forcing by...

Gridded influence functions for NOAA tall towers for January 2010

D. Wesloh & T. Lauvaux
The data provides influence functions, also called tower concentration footprints, for nine towers in the NOAA Greenhouse Gas tall tower reference network. The influence functions are five dimensional arrays: the first two correspond to the mole fraction observations, the third to the time before the observation, and the last two to the spatial extent of the fluxes. Coordinates and transform parameters are provided to express the spatial locations of the fluxes in latitude and longitude...

Historical Markers

Matthew Hansen

Pennsylvania Gap analysis program, Mammal habitat models -90meter

W. L. Myers, R. P. Brooks & J. A. Bishop
This layer represents a potential habitat model for Mammals in Pennsylvania at 90 meter resolution. The model associates occurrence of suitable habitat with key environmental factors that can be mapped over the entire region. These key factors include vegetative land cover, presence of human activity, elevation, topographic position, wetland characteristics and stream size and proximity. Areas of potential species presence were tabulated based on current and historical information and a series of conditional statements proceeded...

A Comprehensive Yeast Epigenome Probed by ChIP-exo Reveals Fundamental Distinctions in Gene Regulation

Matthew J. Rossi, Prashant K. Kuntala, William K.M. Lai, Guray Kuzu, Naomi Yamada, Nitika Badjatia, Chitvan Mittal, Kylie Bocklund, Nina Farrell, Joshua D. Mairose, Thomas R. Blanda, Kate S. Mistretta, David J. Rocco, Emily S. Perkinson, Gretta D. Kellogg, Shaun Mahony & B. Franklin Pugh
Hundreds of diverse proteins bind to the Saccharomyces genome to orchestrate transcription. Here we present the most comprehensive look at the yeast “epigenome” (defined here as the set of measurable genome-interacting proteins) through the use of ultra-high resolution chromatin immunoprecipitation followed by exonuclease (ChIP-exo). We collected datasets on over 800 unique proteins from rapidly growing cells in rich media. Approximately 500 produced biologically interpretable data. We created a website that allows users to quickly assess...

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