552 research outputs found
American Etiquette and Rules of Politeness (Part One)
This is a volume dedicated to explaining American etiquette, which the authors consider to be, The most complete work on Etiquette that has yet been presented to the public. This first part of the book covers the value of etiquette, good manners, social intercourse, home etiquette, home culture, entrance into society, introductions, salutations, conversation, table etiquette, street etiquette, traveling, riding, driving, public etiquette, calling and visiting, receptions, parties, dinners, women\u27s higher culture, courtship, marriage, wedding etiquette, good conduct, anniversaries, personal care and hygiene, and clothing.https://openworks.wooster.edu/motherhomeheaven/1080/thumbnail.jp
American Etiquette and Rules of Politeness (Part Two)
This is a volume dedicated to explaining American etiquette, which the authors consider to be, The most complete work on Etiquette that has yet been presented to the public. This second part of the book discusses the etiquette of gifts, business, letter writing, notes, cards, funerals, addressing foreign people with titles, games, and amusements. It also discusses specific etiquette for Washington, D.C. The final chapters explain the language of flowers, the significance of precious stones, and recipes for personal care.https://openworks.wooster.edu/motherhomeheaven/1081/thumbnail.jp
Antidiabetic activity of Terminalia sericea Burch. Ex DC constituents
Diabetes mellitus is an endocrine disorder that affects more than 100 million people worldwide. South African plants namely Terminalia
sericea, Euclea natalensis, Warbugia salutaris, Aloe ferox Artemisia afra, Sclerocarya birrea, Spirostachys africana and Psidium guajava
were investigated for their in vitro antidiabetic and antioxidant activities. Terminalia sericea stem bark extract showed the best results against
α-glucosidase and α-amylase enzymes. Bioassay-guided fractionation of an acetone extract of T. sericea stem bark led to the isolation of four
known compounds namely β-sitosterol (1), β-sitosterol-3-acetate (2), lupeol (3), and stigma-4-ene-3-one (4), in addition to two inseparable
sets of mixtures of isomers [epicatechin-catechin; (M1) and gallocatechin-epigallocatechin; (M2). 1 and 3 showed best inhibitory activity on
α-glucosidase (IC50:54.5 μM and 66.48). The bio-evaluation of purified compound’s inhibitory activity on α-amylase, showed that lupeol and
β-sitosterol exhibited IC50 values of 140.72 and 216.02 μM respectively against α-amylase. 2, M1, 3 and M2 were found to be non-toxic to
Vero cells. This study is the first to report a-glucosidase, a-amylase of M1, M2, 2 and 4 isolated from T. sericea which validated the
traditional use of the bark of T. sericea for diabetes in South Africa.http://www.naturalproduct.us/nf201
Implications of "peak oil" for atmospheric CO2 and climate
Unconstrained CO2 emission from fossil fuel burning has been the dominant
cause of observed anthropogenic global warming. The amounts of "proven" and
potential fossil fuel reserves are uncertain and debated. Regardless of the
true values, society has flexibility in the degree to which it chooses to
exploit these reserves, especially unconventional fossil fuels and those
located in extreme or pristine environments. If conventional oil production
peaks within the next few decades, it may have a large effect on future
atmospheric CO2 and climate change, depending upon subsequent energy choices.
Assuming that proven oil and gas reserves do not greatly exceed estimates of
the Energy Information Administration, and recent trends are toward lower
estimates, we show that it is feasible to keep atmospheric CO2 from exceeding
about 450 ppm by 2100, provided that emissions from coal, unconventional fossil
fuels, and land use are constrained. Coal-fired power plants without
sequestration must be phased out before mid-century to achieve this CO2 limit.
It is also important to "stretch" conventional oil reserves via energy
conservation and efficiency, thus averting strong pressures to extract liquid
fuels from coal or unconventional fossil fuels while clean technologies are
being developed for the era "beyond fossil fuels". We argue that a rising price
on carbon emissions is needed to discourage conversion of the vast fossil
resources into usable reserves, and to keep CO2 beneath the 450 ppm ceiling.Comment: (22 pages, 7 figures; final version accepted by Global Biogeochemical
Cycles
Angular position of nodes in the superconducting gap of YBCO
The thermal conductivity of a YBCO single crystal has been studied as a
function of the relative orientation of the crystal axes and a magnetic field
rotating in the Cu-O planes. Measurements were carried out at several
temperatures below T_c and at a fixed field of 30 kOe. A four-fold symmetry
characteristic of a superconducting gap with nodes at odd multiples of 45
degrees in k-space was resolved. Experiments were performed to exclude a
possible macroscopic origin for such a four-fold symmetry such as sample shape
or anisotropic pinning. Our results impose an upper limit of 10% on the weight
of the s-wave component of the essentially d-wave superconducting order
parameter of YBCO.Comment: 10 pages, 4 figure
Large Deviations of the Maximum Eigenvalue in Wishart Random Matrices
We compute analytically the probability of large fluctuations to the left of
the mean of the largest eigenvalue in the Wishart (Laguerre) ensemble of
positive definite random matrices. We show that the probability that all the
eigenvalues of a (N x N) Wishart matrix W=X^T X (where X is a rectangular M x N
matrix with independent Gaussian entries) are smaller than the mean value
=N/c decreases for large N as , where \beta=1,2 correspond respectively to
real and complex Wishart matrices, c=N/M < 1 and \Phi_{-}(x;c) is a large
deviation function that we compute explicitly. The result for the Anti-Wishart
case (M < N) simply follows by exchanging M and N. We also analytically
determine the average spectral density of an ensemble of constrained Wishart
matrices whose eigenvalues are forced to be smaller than a fixed barrier. The
numerical simulations are in excellent agreement with the analytical
predictions.Comment: Published version. References and appendix adde
The Grizzly, October 30, 1981
Founders Day 100th Year of Coeducation • Board of Directors Approve Tuition Increase • Stevens Talks on Hazing to Packed House • Comment: What Eileen Stevens Didn\u27t Say • Drexel-Ursinus Offer Evening Courses at Limerick and UC • Old Men\u27s Undergoes Heating Renovations • ZX Business Society Grows • Lee Savary: Contrasting Natural and Man-made • Study Abroad Series: Seize the Day • Law of the Sea, Law of the Nations • Gridders to Enter New League in 1983 • Bears Lose Homecoming Heartbreaker • X-Country: 38 Straight W\u27s • Field Hockey Trips West Chester 3-0https://digitalcommons.ursinus.edu/grizzlynews/1065/thumbnail.jp
On the thermoelectricity of correlated electrons in the zero-temperature limit
The Seebeck coefficient of a metal is expected to display a linear
temperature-dependence in the zero-temperature limit. To attain this regime, it
is often necessary to cool the system well below 1K. We put under scrutiny the
magnitude of this term in different families of strongly-interacting electronic
systems. For a wide range of compounds (including heavy-fermion, organic and
various oxide families) a remarkable correlation between this term and the
electronic specific heat is found. We argue that a dimensionless ratio relating
these two signatures of mass renormalisation contains interesting information
about the ground state of each system. The absolute value of this ratio remains
close to unity in a wide range of strongly-correlated electron systems.Comment: 15 pages, including two figure
The largest deep-ocean silicic volcanic eruption of the past century
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Science Advances 4 (2018): e1701121, doi:10.1126/sciadv.1701121.The 2012 submarine eruption of Havre volcano in the Kermadec arc, New Zealand, is the largest deep-ocean eruption in history and one of very few recorded submarine eruptions involving rhyolite magma. It was recognized from a gigantic 400-km2 pumice raft seen in satellite imagery, but the complexity of this event was concealed beneath the sea surface. Mapping, observations, and sampling by submersibles have provided an exceptionally high fidelity record of the seafloor products, which included lava sourced from 14 vents at water depths of 900 to 1220 m, and fragmental deposits including giant pumice clasts up to 9 m in diameter. Most (>75%) of the total erupted volume was partitioned into the pumice raft and transported far from the volcano. The geological record on submarine volcanic edifices in volcanic arcs does not faithfully archive eruption size or magma production.This research was funded by Australian Research Council Postdoctoral fellowships
(DP110102196 and DE150101190 to R. Carey), a short-term postdoctoral fellowship grant
from the Japan Society for the Promotion of Science (to R. Carey), National Science Foundation grants (OCE1357443 to B.H., OCE1357216 to S.A.S., and EAR1447559 to J.D.L.W.), and a
New Zealand Marsden grant (U001616 to J.D.L.W.). J.D.L.W. and A.M. were supported by a research
grant and PhD scholarship from the University of Otago. R.W. was supported by NIWA
grant COPR1802. J.D.L.W. and F.C.-T. were supported by GNS Science grants CSA-GHZ and CSA-EEZ.
M.J. was supported by the U.S. Department of Defense (DoD) through the National Defense
Science and Engineering Graduate Fellowship (NDSEG) Program
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