161 research outputs found
Relative value of ruminally degradable and undegradable protein on the utilization of low-quality prairie hay by steers
An experiment was performed to investigate
the impact of providing six levels of ruminally degradable protein (RDP; protein that is available to ruminal microbes) in combination with two levels of ruminally undegradable protein (RUP; protein that is not available to the ruminal microbes, but can be digested directly by cattle) on the intake and digestion of low-quality prairie hay. Twelve steers were provided unlimited access to low-quality prairie hay (5.3% crude protein and 71.7% neutral detergent fiber) throughout the trial. To simulate
dietary RUP, casein was infused abomasally
once daily at either 0 or 0.087% of body
weight. To simulate dietary RDP, casein was
infused ruminally once daily at 0, 0.029,
0.058, 0.087, 0.116, or 0.145% of body weight. As provision of RDP increased, forage
intake and fiber digestion increased. Supplementing with RUP alone increased forage
intake but not fiber digestion, although the
intake response was not as large as providing
the same amount of RDP. In conclusion, RUP
is less efficient than RDP in stimulating forage intake and digestion
Eroding market stability by proliferation of financial instruments
We contrast Arbitrage Pricing Theory (APT), the theoretical basis for the
development of financial instruments, with a dynamical picture of an
interacting market, in a simple setting. The proliferation of financial
instruments apparently provides more means for risk diversification, making the
market more efficient and complete. In the simple market of interacting traders
discussed here, the proliferation of financial instruments erodes systemic
stability and it drives the market to a critical state characterized by large
susceptibility, strong fluctuations and enhanced correlations among risks. This
suggests that the hypothesis of APT may not be compatible with a stable market
dynamics. In this perspective, market stability acquires the properties of a
common good, which suggests that appropriate measures should be introduced in
derivative markets, to preserve stability.Comment: 26 pages, 8 figure
Scaling exponent of the maximum growth probability in diffusion-limited aggregation
An early (and influential) scaling relation in the multifractal theory of
Diffusion Limited Aggregation(DLA) is the Turkevich-Scher conjecture that
relates the exponent \alpha_{min} that characterizes the ``hottest'' region of
the harmonic measure and the fractal dimension D of the cluster, i.e.
D=1+\alpha_{min}. Due to lack of accurate direct measurements of both D and
\alpha_{min} this conjecture could never be put to serious test. Using the
method of iterated conformal maps D was recently determined as D=1.713+-0.003.
In this Letter we determine \alpha_{min} accurately, with the result
\alpha_{min}=0.665+-0.004. We thus conclude that the Turkevich-Scher conjecture
is incorrect for DLA.Comment: 4 pages, 5 figure
Occupational Communication as Boundary Mechanism
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/69000/2/10.1177_073088847400100404.pd
Is American Public Administration Detached From Historical Context?: On the Nature of Time and the Need to Understand It in Government and Its Study
The study of public administration pays little attention to history. Most publications are focused on current problems (the present) and desired solutions (the future) and are concerned mainly with organizational structure (a substantive issue) and output targets (an aggregative issue that involves measures of both individual performance and organizational productivity/services). There is much less consideration of how public administration (i.e., organization, policy, the study, etc.) unfolds over time. History, and so administrative history, is regarded as a “past” that can be recorded for its own sake but has little relevance to contemporary challenges. This view of history is the product of a diminished and anemic sense of time, resulting from organizing the past as a series of events that inexorably lead up to the present in a linear fashion. To improve the understanding of government’s role and position in society, public administration scholarship needs to reacquaint itself with the nature of time.Yeshttps://us.sagepub.com/en-us/nam/manuscript-submission-guideline
The energy spectrum of cosmic rays beyond the turn-down around 10^17 eV as measured with the surface detector of the Pierre Auger Observatory
We present a measurement of the cosmic-ray spectrum above 100 PeV using the part of the surface detector of the Pierre Auger Observatory that has a spacing of 750 m. An inflection of the spectrum is observed, confirming the presence of the so-called second-knee feature. The spectrum is then combined with that of the 1500 m array to produce a single measurement of the flux, linking this spectral feature with the three additional breaks at the highest energies. The combined spectrum, with an energy scale set calorimetrically via fluorescence telescopes and using a single detector type, results in the most statistically and systematically precise measurement of spectral breaks yet obtained. These measurements are critical for furthering our understanding of the highest energy cosmic rays
Reconstruction of events recorded with the surface detector of the Pierre Auger Observatory
Cosmic rays arriving at Earth collide with the upper parts of the atmosphere, thereby inducing extensive air showers. When secondary particles from the cascade arrive at the ground, they are measured by surface detector arrays. We describe the methods applied to the measurements of the surface detector of the Pierre Auger Observatory to reconstruct events with zenith angles less than 60o using the timing and signal information recorded using the water-Cherenkov detector stations. In addition, we assess the accuracy of these methods in reconstructing the arrival directions of the primary cosmic ray particles and the sizes of the induced showers
Desempenho de bovinos de corte mantidos em pastagem de capim-marandu submetidos a diferentes estratĂ©gias de suplementação no perĂodo das águas e da seca
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