2,159 research outputs found
Effects of Tillage and Grass Filter Strips on Surface Runoff of Water, Nitrate, Sediment, and Atrazine
The contamination of streams and other natural bodies of water through agricultural runoff has become a very important environmental issue. Surface water runoff can contain heavy loads of sediment and/or agricultural chemicals, such as nitrogen and atrazine. Conservation tillage methods with vegetative filter strips downslope from cropped fields help· to combat this problem. Conservation tillage has proven effective in decreasing erosion by decreasing exposure of the soil surface to rainfall. Vegetative filter strips provide an area where sediment and agricultural chemicals from cropland can be deposited before the runoff reaches a body of water
TOBIAS CENTER FOR LEADERSHIP EXCELLENCE
poster abstractThe Randall L. Tobias Center for Leadership Excellence was established in 2004. The vision is for it to become one of the top 3 or 4 internationally recognized Centers on Leadership Excellence. The Tobias Center is explicitly cross-disciplinary in its study of leadership and was created as a collaboration of the Kelley School of Business, the School of Public and Environmental Affairs (SPEA) and the School of Education and the Center on Philanthropy.
The Tobias Center is an Indiana University center and is housed in the Kelley School in Indianapolis. The programs of the Center fall into three major areas: research, community outreach and education, and teaching.
The poster will highlight each of the Centerâs programs in each of the three areas. For Research, it will describe the Centerâs Faculty Fellows, Doctoral Fellows and Leadership Laboratories. The Centerâs community outreach and education programs include the Hoosier Fellows Program, the three lecture programs, and its annual conference. Teaching initiatives of the Tobias Center include the Urban Leadership Education Institute, the Undergraduate Leadership Academy and School of Medicine Leadership course
Manifestation of superfluidity in an evolving Bose-condensed gas
We study the generation of excitations due to an ''impurity''(static
perturbation) placed into an oscillating Bose-condensed gas in the
time-dependent trapping field. It is shown that there are two regions for the
position of the local perturbation. In the first region the condensate flows
around the ''impurity'' without generation of excitations demonstrating
superfluid properties. In the second region the creation of excitations occurs,
at least within a limited time interval, revealing destruction of
superfluidity. The phenomenon can be studied by measuring the damping of
condensate oscillations at different positions of the ''impurity''
Dynamical instability of a condensate induced by a rotating thermal gas
We study surface modes of the condensate in the presence of a rotating
thermal cloud in an axisymmetric trap. By considering collisions that transfer
atoms between the condensate and noncondensate, we find that modes which rotate
in the same sense as the thermal cloud damp less strongly than counter-rotating
modes. We show that above a critical angular rotation frequency, equivalent to
the Landau stability criterion, the co-rotating mode becomes dynamically
unstable, leading to the possibility of vortex nucleation. This kind of
mechanism is proposed as a natural explanation for the formation of vortices
observed recently in the experiment of Haljan \emph{et al} {[}P. C. Haljan
\emph{et al.}, cond-mat/0106362{]}. We also generalize our stability analysis
to treat the case where the stationary state of the condensate already
possesses a single vortex.Comment: 4 pages, no figure
Katanin catalyzes microtubule depolymerization independently of tubulin C-terminal tails
Microtubule network remodeling is an essential process for cell development, maintenance, cell division, and motility. Microtubuleâsevering enzymes are key players in the remodeling of the microtubule network; however, there are still open questions about their fundamental biochemical and biophysical mechanisms. Here, we explored the ability of the microtubuleâsevering enzyme katanin to depolymerize stabilized microtubules. Interestingly, we found that the tubulin Câterminal tail (CTT), which is required for severing, is not required for kataninâcatalyzed depolymerization. We also found that the depolymerization of microtubules lacking the CTT does not require ATP or katanin\u27s ATPase activity, although the ATP turnover enhanced depolymerization. We also observed that the depolymerization rate depended on the katanin concentration and was best described by a hyperbolic function. Finally, we demonstrate that katanin can bind to filaments that lack the CTT, contrary to previous reports. The results of our work indicate that microtubule depolymerization likely involves a mechanism in which binding, but not enzymatic activity, is required for tubulin dimer removal from the filament ends
Building Bridges with Boats: Preserving Community History through Intra- and Inter-Institutional Collaboration
This chapter discusses Launching through the Surf: The Dory Fleet of Pacific City, a project which documents the historical and contemporary role of dory fishers in the life of the coastal village of Pacific City, Oregon, U.S. Linfield Collegeâs Department of Theatre and Communication Arts, its Jereld R. Nicholson Library, the Pacific City Arts Association, the Pacific City Dorymen\u27s Association, and the Linfield Center for the Northwest joined forces to engage in a collaborative college and community venture to preserve this important facet of Oregonâs history. Using ethnography as a theoretical grounding and oral history as a method, the project utilized artifacts from the dory fleet to augment interview data, and faculty/student teams created a searchable digital archive available via open access. The chapter draws on the authorsâ experiences to identify a philosophy of strategic collaboration. Topics include project development and management, assessment, and the role of serendipity. In an era of value-added services where libraries need to continue to prove their worth, partnering with internal and external entities to create content is one way for academic libraries to remain relevant to agencies that do not have direct connections to higher education. This project not only developed a positive âtown and gownâ relationship with a regional community, it also benefited partner organizations as they sought to fulfill their missions. The project also serves as a potential model for intra- and inter-agency collaboration for all types of libraries
Vortex stabilization in a small rotating asymmetric Bose-Einstein condensate
We use a variational method to investigate the ground-state phase diagram of
a small, asymmetric Bose-Einstein condensate with respect to the dimensionless
interparticle interaction strength and the applied external rotation
speed . For a given , the transition lines between no-vortex
and vortex states are shifted toward higher relative to those for the
symmetric case. We also find a re-entrant behavior, where the number of vortex
cores can decrease for large . In addition, stabilizing a vortex in a
rotating asymmetric trap requires a minimum interaction strength. For a given
asymmetry, the evolution of the variational parameters with increasing
shows two different types of transitions (sharp or continuous), depending on
the strength of the interaction. We also investigate transitions to states with
higher vorticity; the corresponding angular momentum increases continuously as
a function of
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