8,395 research outputs found
The role of stress-reactivity, stress-recovery and risky decision-making in psychosocial stress-induced alcohol consumption in social drinkers
A Survey of Team Teaching Effectiveness in Executive Graduate Business Programs
This paper contributes to the academic literature by using a survey instrument of executive students to assess the effectiveness of team teaching in a multidisciplinary Executive MBA management program and an Executive Masterâs program in Finance. The cohort structure of the program and the virtual similarities between the two programs allows for a unique way of addressing this issue. The results of the survey show that the multidisciplinary EMBA program was more effective in fostering an integrated team teaching approach. The results also suggest that there is a transition process in incorporating the team teaching approach in new programs as evidenced by the results in the Executive Masterâs Program in Finance
Weed Control in Lawns and Other Turf
Guide to weed control in lawns and other turf discusses methods of weed control, time of application, calibration of sprayers, dry spreaders, control of common weeds, and cleaning the sprayer
Angular Momentum Transport by MHD Turbulence in Accretion Disks: Gas Pressure Dependence of the Saturation Level of the Magnetorotational Instability
The saturation level of the magnetorotational instability (MRI) is
investigated using three-dimensional MHD simulations. The shearing box
approximation is adopted and the vertical component of gravity is ignored, so
that the evolution of the MRI is followed in a small local part of the disk. We
focus on the dependence of the saturation level of the stress on the gas
pressure, which is a key assumption in the standard alpha disk model. From our
numerical experiments it is found that there is a weak power-law relation
between the saturation level of the Maxwell stress and the gas pressure in the
nonlinear regime; the higher the gas pressure, the larger the stress. Although
the power-law index depends slightly on the initial field geometry, the
relationship between stress and gas pressure is independent of the initial
field strength, and is unaffected by Ohmic dissipation if the magnetic Reynolds
number is at least 10. The relationship is the same in adiabatic calculations,
where pressure increases over time, and nearly-isothermal calculations, where
pressure varies little with time. Our numerical results are qualitatively
consistent with an idea that the saturation level of the MRI is determined by a
balance between the growth of the MRI and the dissipation of the field through
reconnection. The quantitative interpretation of the pressure-stress relation,
however, may require advances in the theoretical understanding of non-steady
magnetic reconnection.Comment: 45 pages, 5 tables, 17 figures, accepted for publication in Ap
Temperature-dependent Hall scattering factor and drift mobility in remotely doped Si:B/SiGe/Si heterostructures
Hall-and-Strip measurements on modulation-doped SiGe heterostructures and combined Hall and capacitanceâvoltage measurements on metal-oxide-semiconductor (MOS)-gated enhancement mode structures have been used to deduce Hall scattering factors, rH, in the Si1 â xGex two-dimensional hole gas. At 300 K, rH was found to be equal to 0.4 for x = 0.2 and x = 0.3. Knowing rH, it is possible to calculate the 300 K drift mobilities in the modulation-doped structures which are found to be 400 cm2 V â 1 s â 1 at a carrier density of 3.3 Ă 1011 cm â 2 for x = 0.2 and 300 cm2 V â 1 s â 1 at 6.3 Ă 1011 cm â 2 for x = 0.3, factors of between 1.5 and 2.0 greater than a Si pMOS control
Investigation of Split Groundplanes at the Connector for EMI Control
EMI can often be reduced by selectively filtering various parts of a given system. One common method employed by designers is to split the groundplane near the chassis and route I/O lines over the split. The rationale is based on providing a large series impedance to common-mode currents on the I/O lines. In this manner, PCB designers hope to lower the level of noise currents contributing to radiation. This work studies the efficacy of the groundplane split as a deterrent for EMI associated with I/O lines being driven against other extended reference structures. A test-board was developed to analyze the impedance of the groundplane split with various configurations
Structural studies of two proteins involved in the maintenance of genomic stability FEN 1 and DNA-PKcs
Genomic stability refers to an organismâs ability to maintain and pass forward its
genetic information. There are a raft of proteins and pathways whose sole purpose is
maintaining this stability through swiftly replicating DNA as well as accurately repairing
damage caused through contact with endogenous and exogenous DNA damaging elements.
This study will focus on the structural aspects of two proteins that play a part in different
areas of genome maintenance.
Flap Endonuclease 1 (FEN 1) works in DNA replication, where it is tasked with
removing a small RNA flap that is created during Okazaki fragment formation. This flap
removal is essential to mature these fragments into one continuous strand of nascent DNA.
Using the archeon Pyrococcus abyssi (Pab) as a model system has the advantage of possessing
simple replicative machinery, whilst bearing striking similarities with the human system. Pab
is a hyperthermophilic, piezophile meaning it thrives in conditions of high temperature and
pressure.
DNA-dependent protein kinase (DNA-PK) is a holoenzyme that plays a role in the
Non Homologous End Joining (NHEJ) pathway by repairing DNA double strand breaks
(DSBâs). In cancer therapy, a patient is exposed to DNA damaging elements, leading to an
ever-increasing population of DSBs. If an inhibitor of DNA-PKcs were introduced along
with this therapy it could potentiate its effect, as the cancerous cells will be less able to repair
the damage. The aim of this part of the study is to determine a protocol to generate pure,
soluble, correctly folded protein for the purposes of biophysical characterisation and X-ray
crystallographic structural studies
KEY FACTORS CONTRIBUTING TO COW/CALF COSTS, PROFITS AND PRODUCTION
In this study, cow/calf Standardized Performance Analysis (SPA) data for Texas, Oklahoma, and New Mexico are used to analyze how total cost, production, and profitability are affected by management choices. Total cost is the financial cost associated with raising a calf through the weaning stage; profits are measured using the rate of return on assets; production is determined by pounds weaned per exposed female. Variables such as herd size, pounds of feed fed, calving percentage, death loss, length of breeding season and investment in asset groups are used in regressions. Key factors contributing to a cow/calf operation's costs, production, and profitability are identified.Livestock Production/Industries,
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