Tectonic land level changes and their contribution to sea-level rise, Humboldt Bay region, Northern California

Land subsidence in and around Humboldt Bay, California contributes to sea-level rise up to 2-3 times greater than anywhere else in California. Sea-level observations and highway level surveys confirm that land is subsiding in Humboldt Bay, in contrast to Crescent City where the land is rising. Rates of sea-level rise are 5.84 mm/yr in South Humboldt Bay (Hookton Slough), 3.76 mm/yr at Fields Landing, 4.61 mm/yr at the North Spit, 2.53 mm/yr at Samoa, and 3.39 mm/yr in Arcata Bay (Mad River Slough). Rates of land subsidence are -3.56 mm/yr in South Humboldt Bay (Hookton Slough), -1.48 mm/yr at Fields Landing, -2.33 mm/yr at the North Spit, -0.25 mm/yr at Samoa, and -1.11 mm/yr in Arcata Bay (Mad River Slough)

How Relationships with Faculty and Peers Affect Value Development in Undergraduate Engineering Education: A National Survey Analysis

To prepare students for the serious ethical dilemmas encountered in STEM (science, technology, engineering, and mathematics), higher education educators strive to influence students’ value development. Despite this goal, little is known about value development in undergraduate engineering education. Survey data from the 2008-2009 national administration of the revised College Student Experiences in STEM Questionnaire (CSESQ) was analyzed to examine the relationship between students’ engagement with faculty and peers and their perceived value development. Findings from the present study offer insight into (a) engineering students’ value development in college, and (b) the influence of relationships with peers and faculty members on such outcomes. Results from our analysis indicate that students who rate their relations with peers and faculty as positive, supportive, and welcoming also tend to report higher perceived gains in terms of value development. College classification and relationships with others such as faculty members were found to be statistically significant predictors of value development for undergraduate engineering students

Institutional Barriers to Black and Latino Male Collegians’ Success in Engineering and Related STEM Fields

Diverse people and perspectives are needed to spur innovation and tackle societal problems. A wealth of untapped intellectual and economic potential exists among historically underrepresented racial/ethnic groups – including Blacks and Latinos – who have not had equitable access to engineering and related STEM fields. For Blacks and Latinos who are accepted into engineering and related STEM fields, they face a number of barriers to their success which lead to low retention and graduation rates. In historically male-dominated fields such as engineering and related STEM disciplines, Black and Latino men have remained underrepresented at the student and faculty ranks. To uncover and tackle the “institutional barriers” that men of color face, nearly 50 interviews with Black and Latino collegians were analyzed to better understand the mechanisms that prevent them from maximizing their potential for success in engineering and related STEM fields. Interviews revealed that students must overcome institutional obstacles such as: (a) inadequate academic advising, (b) poor quality teaching, (c) limited course offerings, and (d) insufficient financial aid. This paper includes recommendations that are helpful to faculty, staff and administrators who are interested in increasing the number of Black and Latino male graduates in engineering and related STEM fields

Isolation of Unknown Genes from Human Bone Marrow by Differental Screening and Single-Pass cDNA Sequences Determination

A cDNA sequencing project was initiated to characterize gene expression in human bone marrow and develop strategies to isolate novel genes. Forty-eight random cDNAs from total human bone marrow were subjected to single-pass DNA sequence analysis to determine a limited complexity of mRNAs expressed in the bone marrow. Overall, 8 cDNAs (17%) showed no similarity to known sequences. Information from DNA sequence analysis was used to develop a differential prescreen to subtract unwanted cDNAs and to enrich for unknown cDNAs. Forty-eight cDNAs that were negative with a complex probe were subject to single-pass DNA sequence determination. Of these prescreened cDNAs, the number of unknown sequences increased to 23 (48%). Unknown cDNAs were also characterized by RNA expression analysis using 25 different human leukemic cell lines. Of 13 unknown cDNAs tested, 10 were expressed in all cell types tested and 3 revealed a hematopoietic lineage-restricted expression pattern. Interestingly, while a total of only 96 bone marrow cDNAs were sequenced, 31 of these cDNAs represent sequences from unknown genes and 12 showed significant similarities to sequences in the data bases. One cDNA revealed a significant similarity to a serine/threonine-protein kinase at the amino acid level (56% identity for 123 amino acids) and may represent a previously unknown kinase. Differential screening techniques coupled with single-pass cDNA sequence analysis may prove to be a powerful and simple technique to examine developmental gene expression

In My Little Ford Coupe

A pencil sketch of a car driving down a road with trees on either side.https://scholarsjunction.msstate.edu/cht-sheet-music/2536/thumbnail.jp

Observational Constraints on the Molecular Gas Content in Nearby Starburst Dwarf Galaxies

Using star formation histories derived from optically resolved stellar populations in nineteen nearby starburst dwarf galaxies observed with the Hubble Space Telescope, we measure the stellar mass surface densities of stars newly formed in the bursts. By assuming a star formation efficiency (SFE), we then calculate the inferred gas surface densities present at the onset of the starbursts. Assuming a SFE of 1%, as is often assumed in normal star-forming galaxies, and assuming that the gas was purely atomic, translates to very high HI surface densities (~10^2-10^3 Msun pc^-2), which are much higher than have been observed in dwarf galaxies. This implies either higher values of SFE in these dwarf starburst galaxies or the presence of significant amounts of H_2 in dwarfs (or both). Raising the assumed SFEs to 10% or greater (in line with observations of more massive starbursts associated with merging galaxies), still results in HI surface densities higher than observed in 10 galaxies. Thus, these observations appear to require that a significant fraction of the gas in these dwarf starbursts galaxies was in the molecular form at the onset of the bursts. Our results imply molecular gas column densities in the range 10^19-10^21 cm^-2 for the sample. In those galaxies where CO observations have been made, these densities correspond to values of the CO-H_2 conversion factor (X_CO) in the range >3-80x10^20 cm^-2 (K km s^-1)^-1, or up to 40x greater than Galactic X_CO values.Comment: 8 pages, 4 figures, 2 table

Measuring the Educational Benefits of Diversity in Engineering Education: A Multi-Institutional Survey Analysis of Women and Underrepresented Minorities

Changing demographics of the U.S. population drive growing emphases on diversity in engineering education. Still, questions persist about the educational benefits of race and gender diversity within the student population, despite decades of supportive research. The present study sought to estimate the educational benefits that accrue to undergraduate engineering students who interact with diverse peers and perspectives. Furthermore, differences across gender and race were explored. Multi-institutional survey data were analyzed for over 100 undergraduate engineering students using a 2007 administration of the National Survey of Student Engagement (NSSE). Findings show that encouraging contact among students from different economic, social, or racial/ethnic backgrounds can produce greater perceived learning gains amongst engineering students

The ACS Nearby Galaxy Survey Treasury IV. The Star Formation History of NGC 2976

We present resolved stellar photometry of NGC 2976 obtained with the Advanced Camera for Surveys (ACS) as part of the ACS Nearby Galaxy Survey Treasury (ANGST) program. The data cover the radial extent of the major axis of the disk out to 6 kpc, or ~6 scale lengths. The outer disk was imaged to a depth of M_F606W ~ 1, and an inner field was imaged to the crowding limit at a depth of M_F606W ~ -1. Through detailed analysis and modeling of these CMDs we have reconstructed the star formation history of the stellar populations currently residing in these portions of the galaxy, finding similar ancient populations at all radii but significantly different young populations at increasing radii. In particular, outside of the well-measured break in the disk surface brightness profile, the age of the youngest population increases with distance from the galaxy center, suggesting that star formation is shutting down from the outside-in. We use our measured star formation history, along with H I surface density measurements, to reconstruct the surface density profile of the disk during previous epochs. Comparisons between the recovered star formation rates and reconstructed gas densities at previous epochs are consistent with star formation following the Schmidt law during the past 0.5 Gyrs, but with a drop in star formation efficiency at low gas densities, as seen in local galaxies at the present day. The current rate and gas density suggest that rapid star formation in NGC 2976 is currently in the process of ceasing from the outside-in due to gas depletion. This process of outer disk gas depletion and inner disk star formation was likely triggered by an interaction with the core of the M81 group >~1 Gyr ago that stripped the gas from the galaxy halo and/or triggered gas inflow from the outer disk toward the galaxy center.Comment: 22 pages, 14 figures, 2 tables, accepted for publication by Ap

Academic and Social Barriers to Black and Latino Male Collegians\u27 Success in Engineering and Related STEM Fields

Historically underrepresented racial/ethnic minorities (i.e. African Americans, Latinos, and Native Americans) have experienced barriers to their success in engineering and related STEM fields. These student populations have had lower degree attainment rates, switch to non-STEM majors more frequently, and experience unique social challenges when compared to White and Asian Pacific Islander counterparts. To examine these findings, nearly 50 interviews were conducted and analyzed in the present study to better understand the academic and social experiences of African American and Latino American men in these fields. Interviews revealed that these students tend to (1) feel alone and invisible, (2) lack same race peers and faculty members, (3) have difficulty applying theory to practice, and (4) lack the pre-college preparation necessary to succeed in STEM fields